65 results about "Pulser pump" patented technology

Methods for forming proppant pillars in a formation during formation fracturing include include periods of pumping a first fracturing fluid including a proppant and an aggregating composition including a reaction product of a phosphate compound or a plurality of phosphate and an amine, periods of pumping a second fracturing fluid excluding a proppant and an aggregating composition including a reaction product of a phosphate compound and periods of pumping a third fracturing fluid including an aggregating composition including a reaction product of a phosphate compound, where the pumping of the three fracturing fluids may be in any order and may involve continuous pumping, pulse pumping, or non-continuous pumping.

In an arrangement for the dosed injection of a reducing agent into the exhaust tract of an internal combustion engine, comprising a pump for the pulsed pumping of the reducing agent and an atomizing injection nozzle disposed in the exhaust tract of the internal combustion engine, the injection nozzle includes a valve element which opens and closes the injection nozzle depending on the pressure generated by the pump and permits the injection of the reducing agent into the exhaust tract only when the pressure of the reducing agent is in excess of a certain value in order to ensure proper atomization of any reducing agent injected into the exhaust tract.

A gas-liquid mixing type engine exhaust after-treatment jet apparatus comprises a pulse pump, a mixing jet unit, a nozzle, an ejector, a controller and an air source. The mixing jet unit comprises an ejecting cavity, a gas cavity, a nozzle positioning hole communicated with the gas cavity, an air inlet channel, and a limiting hole. The pulse pump comprises a lead for receiving signals and a lead interface, a control signal sent from the controller is transmitted to the pulse pump via the lead to drive the pulse pump to work, and the pulse pump provides the nozzle with a jet flow source. The nozzle sprays liquid to the ejecting cavity, space of the ejecting cavity is arranged in the spraying direction of the liquid, the gas cavity is positioned near a vent of the nozzle, and pressure in the gas cavity is reduced due to the fact that the liquid is sprayed. The purpose of the present invention aims at providing an exhaust after-treatment system that is high in reliability, simple in structure, convenient in installation, replacement and maintenance, and low in cost.

Methods for forming proppant pillars in a formation during formation fracturing include include periods of pumping a first fracturing fluid including a proppant and an aggregating composition including a reaction product of a phosphate compound or a plurality of phosphate and an amine, periods of pumping a second fracturing fluid excluding a proppant and an aggregating composition including a reaction product of a phosphate compound and periods of pumping a third fracturing fluid including an aggregating composition including a reaction product of a phosphate compound, where the pumping of the three fracturing fluids may be in any order and may involve continuous pumping, pulse pumping, or non-continuous pumping.

An improved structure of a vehicle maintenance and washing apparatus is disclosed and the apparatus comprises an air compressor with a pulse pump as a driven source, a one check valve, an engine oil fine filter, at least one or a plurality of strainers, a plurality of three way joints, a plurality of four way joints and a plurality of butterfly valves, characterized an inlet / outlet oil tube and a solvent tube are mounted thereof and the inlet oil tube passes the 1<st >four way joint and then divides into two routes, the 1<st >route inlet oil tube may or may not pass the strainer connecting the 2<nd >four way joint, and the 2<nd >route inlet oil tube passes the engine oil fine filter, the 3<rd >butterfly valve and the 1<st >three way joint and is then connected to the pulse pump, the solvent tube connected to the 4butterfly valve passes the 2<nd >three way joint and the 1<st >three way joint and enters the pulse pump outlet oil tube and from the pulse pump to the one check valve connecting the 2<nd >four way joint, and from the 2<nd >four way joint to the external, the inlet / outlet oil tube is connected to engine lubricating system, or ejector or auto gearshift box which needed to be cleaned.

The invention discloses a method and equipment for controlling top coal cavability with pulse hydraulic fracturing. According to the method, advantages of methods of pulse fracturing and common hydraulic fracturing are combined, a crack network is generated in coal through pulse hydraulic fracturing firstly, secondly, the crack network is further expanded through common large-displacement hydraulic fracturing, then a coal structure can be sufficiently transformed, the top coal breakage degree can be reduced, and the top coal cavability can be improved. The equipment disclosed by the inventioncomprises a small-displacement pulse pump and a large-displacement common pump which are controlled through a three-way valve and a switch valve, in construction, one path of the pulse pump is firstlycommunicated, a common high-pressure pump pipeline is closed, a pulse channel is closed after pulse fracturing is completed, and a common fracturing channel is opened. By adopting the method and theequipment, sufficient cracks can be generated in top coal, an effect of weakening the top coal can be achieved, the top coal cavability can be improved, the top coal cavability breakage degree can bereduced, convenience in construction is achieved, safety and reliability are achieved, and resource waste can be reduced.

The pulse pump is driven by an electric motor and gear reduction driving an eccentric rotor, which, in turn, oscillates a mechanism actuating a diaphragm to transfer fluid through one-way check valves. The pump may be used in a number of different applications, but is particularly useful in applying biodegradation material to consume grease and other biodegradable matter typically found in drainage systems of food processing facilities, converting such matter into carbon dioxide and water. The device includes a system for placing the mechanism in a neutral position when the pump is deactivated, to avoid causing the diaphragm to take a set toward either extreme of travel when parked for an extended time. One embodiment incorporates a multiple piece actuator assembly having a diaphragm sandwiched between components. Another embodiment uses a single piece actuator having a circumferential groove, with the diaphragm having a toroid configuration and attaching within the groove.

The invention relates to powered coal conveyor belt washing equipment. The powered coal conveyor belt washing equipment comprises a washing device and a drying device which are arranged below a return belt, and is characterized in that the washing device comprises water nozzles and mud scraping rollers in sequence in the belt conveying direction; the water nozzles are connected with a spraying pipeline; the spraying pipeline is connected with a washing water source through pulse pumps; each mud scraping roller comprises a rotary drum; a driving device is connected with each rotary drum in a driving manner; a plurality of scraping plates are arranged on the surface of each rotary drum at intervals and radially distributed in the axial direction of the rotary drum; the length of each scraping plate is matched with the width of the return belt; the drying device is arranged at the downstream of the cleaning device, and comprises a ventilator arranged in the width direction of the return belt; a plurality of air outlets facing the return belt are arranged on the ventilator; the air inlet of the ventilator is connected with a draught fan; a water container used for collecting muddy water is arranged below the cleaning device and the drying device; a sewage draining outlet is arranged on the water container; and a spiral conveyor used for pushing mud is arranged at the bottom of the water container.

The invention discloses a method for inhibiting membrane scaling in brackish water desalination treatment. The method comprises the following steps: pretreating brackish water, adding chemicals to remove residual chlorine, carrying out security filtration, adding security filtration and pipelines, pumping a scale inhibitor, and pumping hydrochloric acid. The device further comprises an electromagnetic reversing valve, wherein the two inlets of the electromagnetic reversing valve communicate with a scale inhibitor storage box and a hydrochloric acid storage box through anti-corrosion water pipes correspondingly, the outlet of the electromagnetic reversing valve communicates with a pulse pump, a reverse osmosis membrane assembly is arranged on the outer side of an outer security filter core,a spiral pipeline is fixedly connected to a supporting rod, and micropores are formed in the surface of the spiral pipeline. According to the invention, a scale inhibitor is injected into a spiral pipeline and directly reaches the surface of a reverse osmosis membrane assembly to form a scale inhibitor layer structure, so that the inhibition effect of membrane scaling is improved; and hydrochloric acid can be injected within specified time by utilizing a reversing electromagnetic valve, so that the scaled surface is descaled, membrane scaling can be further inhibited, and the service life ofthe reverse osmosis membrane is prolonged.

The invention discloses an ejection metering module for SCR (selective catalytic reduction) and a controlling method of the ejection metering module. The ejection metering module comprises a support, a pulse pump mounted at one end of the support, an upper end cover fixed at the other end of the support, an ejection nozzle and a controller, and is characterized in that the support extends from the upper portion of a DEF (diesel exhaust fluid) storage tank deeply to the bottom of the DEF storage tank and is fixed on the diesel exhaust fluid storage tank via the upper end cover, the controller controls the pulse pump to work, the pulse pump comprises a solenoid driver, a plunger pump and an internal flow passage which penetrates through the pulse pump axially, working fluid (DEF) enters an inlet of the internal flow passage via a first filter arranged at the inlet at the lower end of the internal flow passage, an outlet of the internal flow passage is higher than the inlet of the same in arrangement, part of the working fluid in the internal flow passage is pumped to the ejection nozzle through the plunger pump, and the other part of the working fluid is drained from the pulse pump via the outlet of the internal flow passage. Characteristic parameters of the pulse pump are prestored in the controller, so that the ejection metering module is capable of working in a slave mode or an intelligent (master) mode.

The invention discloses a SCR injection system. The SCR injection system comprises a pulse pump, an injection vacuum device, a nozzle, and a controller for generating driving signals. The pulse pump receives controller pulse signals to generate pressure fluids so as to supply injection sources to the nozzle and the injection vacuum device. The pulse pump includes an electromagnetic device and a plunger pump. The injection vacuum device includes an injection pipe, an injection cavity, a negative-pressure cavity, a guide port, an electromagnetic conversion switch and an injection outlet. The nozzle includes a filter, a nozzle valve, a bypass valve, a cooling device, a cyclone runner and a cyclone spraying hole. The first purpose of the invention is to provide the SCR injection system, with simple structure, good adaptability, high control precision and convenience for installation, replacement and maintenance, and a control method thereof; and the second purpose is to lower the cost of a liquid injection metering system for exhaust aftertreatment of the engine.

The invention discloses a gradient detection system based on a pulse pumping magnetometer. The gradient detection system comprises a detection light laser, a polarizer, a radio frequency coil, a pulsetype pump light laser, a first atomic gas chamber, a second atomic gas chamber, a quarter-wave plate, detection light, a first reflector, a second reflector, a polarization detection system, a data acquisition system and the like. By setting the circular polarization gradient detection system of pump light or action modes of the pump light and probe light in the first atomic air chamber and the second atomic air chamber, magnetic field gradient values in the two air chambers are obtained. The gradient detection system combines two pulse pumping magnetometers together to share the pump light or the detection light, and subtracts the signals at the signal end or in the atomic gas chambers to extract the magnetic field gradient information, so that the consistency of the two magnetometers iseffectively improved, suppresses a signal-to-noise ratio, obtains a relatively accurate gradient value, reduces the size of the system, and saves the cost.

The invention discloses a pulse pumping passive Q-switched laser with a light delay controllable function. Photoelectric monitoring and feedback functions are added in passive Q-switched laser of pulse pumping, light delay is monitored in real time through a photoelectric detector, a test value is compared with a preset value through a feedback device, and pumping power is fed back and adjusted atthe same time, so that the light delay of a laser is stabilized near the preset value. According to the scheme of the invention, the optical delay of the pulse-pumped passive Q-switched laser can beeffectively controlled, the delay stability of the passive Q-switched laser is improved, the optical pulse can be synchronized with external equipment or devices and the like, and the application of the passive Q-switched laser in the fields of laser radars, spectrum instruments, photoelectric detection and the like is expanded.

The invention discloses a device for controlling desert; a spraying film covering network pulse pump drip irrigation device for controlling desert includes a solar panel, a microprocessor pulse controller, a pulse pump, a nutrition bowl block, a branch of a main water pipeline, drip irrigation pipelines, a main water pipeline and drip irrigation holes; an output terminal wire of the electrode of the solar panel is connected with the microprocessor pulse controller which is connected with the pulse pump by a lead, a water inlet of the pulse pump is connected with the main water pipeline, a water outlet thereof is connected with the branch of the main water pipeline, the branch of the main water pipeline is connected with every drip irrigation pipeline, the nutrition bowl is embedded in the drip irrigation hole of the drip irrigation pipeline, and a glue film is loaded in a manual sprayer which is the existing knapsack sprayer. The device has reasonable structure, good working property, durability, simple installation and simple and convenient maintenance-free; pipeline parts can be recycled when not in use.

The fuel cell system shifts, at least during start, in switching a pulse pump from a stop state to a pumping state to start pumping of the water, to normal control after performing start-operation-control for setting a water supply ability of the pulse pump higher for a predetermined time than the water supply ability during normal control.

The embodiment of the invention provides a pulse circulation hydrofracture pump injection frequency selection method and device. The method comprises the steps of conducting performance test on fracturing fluid to obtain fracturing fluid parameters, wherein the fracturing fluid parameters include the density and elasticity modulus of the fracturing fluid; determining pump injection environmental parameters according to the position of a pulse pump, wherein the pump injection environmental parameters include crack parameters representing the physical property of a crack or mineshaft parametersrepresenting the physical property of a mineshaft; solving the multi-order inherent frequency of a liquid column in the mineshaft or the crack of a fracturing well according to the fracturing fluid parameters and the pump injection environmental parameters based on the output mode of the pulse pump; simulating the conditions of the pulse pressure changing over time at the tail end of the mineshaftor the top of the crack through a preset model when the pump injection frequencies belong to different orders of inherent frequencies; and selecting the inherent frequency corresponding to the maximum pulse pressure amplitude value within the preset time according to the conditions of the pulse pressure changing over time as the pump injection frequency. Thus, the fracturing pump injection construction efficiency is improved.

The invention provides a fuel cell system, which operates as much as possible even if a water level detecting part in a water tank for storing water supplied to a reformer has failed. Concretely, When there is at least a water level sensor is abnormal and at least a water level sensor is normal in a plurality of water level sensors (DS5a, DS5b, DS5c and DS5d) for detecting the water level in water storage tanks (WP2a, WP2b), the fuel cell system (FCS) estimates the water level in water storage tanks (WP2a, WP2b) and a pulse pump (131) continuously delivers water in estimated supply control to the reformer (RF).

The invention relates to a water-wheel type pulse pump and a water turbine generator for the same. The invention comprises the water-wheel type pulse pump and the water turbine generator for the water-wheel type pulse pump. One or a group of generators can generate power of 10 to 50 kilowatts, 100 to 500 kilowatts or 1 to 10 megawatts. The invention can enable a small amount of original water flow in rivulets and channels to be merged into a large amount of water flow to be used for power generation. The water-wheel type pulse pump and the water turbine generator for the water-wheel type pulse pump can be installed in rivulets or channels having permanent water flow without building water retaining dams, changing the original structure and influencing the growing environment of organisms in the sea or river water. If a plurality of water-wheel type pulse pumps and water turbine generators for the water-wheel type pulse pumps are built along coastal areas and rivers in China, the generated energy is further larger than that of the prior various power plants and is enough to meet the requirement for electric energy at present and in the future in China. All thermal power plants, oil fired power plants and nuclear power plants can be eliminated, a large amount of coal and oil can be saved, and a large amount of fund investment can be saved. The water-wheel type pulse pump and the water turbine generator for the water-wheel type pulse pump are useful renewable energy resources for development of irrigational energy resources at present and in the future in China, and are used for providing a strategic decision for solving the energy crisis all over the world.

The invention provides a fuel cell system, which can accurately supply a small amount of water to a reformer and effectively operate continuously. Concretely, the fuel cell system (FCS) is characterized in that a water storage tank includes a first water storage tank (WP2a) which clamps a reverse osmosis membrane (20) and is equipped on an opposite side of a fuel cell module FCM (reformer) and a second water storage tank (WP2b) which is equipped on the fuel cell module FCM (reformer) side with respect to the reverse osmosis membrane (20). A pump includes a pump (111) which delivers water stored in the first water storage tank (WP2a) to the second water storage tank (WP2b) and a pulse pump (131) which delivers water stored in the second water storage tank (WP2b) to the fuel cell module FCM (reformer). The delivering capability of the pulse pump (131) is lower than that of the pump (111).

The invention discloses an intermittent drug delivery analgesic pump with an adjustable drug concentration. The analgesic pump comprises a first lower shell, a drug storage assembly, a first upper shell, a second lower shell and a second upper shell, wherein the drug storage assembly is arranged above the first lower shell, the first upper shell is arranged above the drug storage assembly, the second lower shell is arranged at one side of the first lower shell, and the second upper shell is arranged above the second lower shell. The intermittent drug delivery analgesic pump with the adjustabledrug concentration has the advantages that the analgesic pump is scientific and reasonable, the use is safe and convenient, a first drug pumping bag is used for measuring the volume of anesthetic, asecond drug pumping bag is used for measuring the volume of physiological saline, a second squeezing assembly is used for squeezing the first drug pumping bag and the second drug pumping bag, and a pulse drug pumping bag is used for mixing the anesthetic and the physiological saline, thereby effectively achieving the adjustment and control over the anesthetic concentration, reducing the pain of apatient suffered during an operation, effectively controlling the drug delivery time during the operation, and reducing the work intensity of the medical staff.

An SCR injection metering module and a control method therefor. The module comprises a bracket (7), a pulse pump (1) mounted at one end of the bracket (7), an upper end cover (8) fixed at the other end of the bracket (7), a spray nozzle (18) and a controller (9). The bracket (7) extends from the upper part of a DEF storage tank to the bottom of the DEF storage tank, and is fixed onto the storage tank through the upper end cover (8). The controller (9) controls the operation of the pulse pump (1). The pulse pump (1) comprises a solenoid driver (23) and a plunger pump (22), and an axially penetrating internal flow passage (21), wherein a DEF enters an inlet of the internal flow passage (21) through a first filter (2) arranged at the lower-end inlet of the internal flow passage (21), an outlet of the internal flow passage (21) is higher than the inlet of the internal flow passage (21), a part of the working fluid entering the internal flow passage (21) is pumped to the spray nozzle (18) by the plunger pump (22), and a part thereof is discharged to the pulse pump (1) from the outlet of the internal flow passage (21). The characteristic parameters of the pulse pump (1) are pre-stored in the controller (9), so that the controller (9) can operate in a passive mode or an intelligent mode.

The pulse pump is driven by an electric motor and gear reduction driving an eccentric rotor, which, in turn, oscillates a mechanism actuating a diaphragm to transfer fluid through one-way check valves. The pump may be used in a number of different applications, but is particularly useful in applying biodegradation material to consume grease and other biodegradable matter typically found in drainage systems of food processing facilities, converting such matter into carbon dioxide and water. The device includes a system for placing the mechanism in a neutral position when the pump is deactivated, to avoid causing the diaphragm to take a set toward either extreme of travel when parked for an extended time. One embodiment incorporates a multiple piece actuator assembly having a diaphragm sandwiched between components. Another embodiment uses a single piece actuator having a circumferential groove, with the diaphragm having a toxoid configuration and attaching within the groove.

A pulse pump includes a pump body and a plunger pump; the plunger pump includes a sleeve, a plunger, an input valve, and an output valve; the sleeve and the plunger form a compression and delivery space; the input valve and the output valve are connected to the compression and delivery space; relative motion of the sleeve and the plunger results in input and output of liquid in the compression and delivery space; the input valve includes an input valve body, an input valve seat, and a front limiting member; the input valve body is positioned between the input valve seat and the front limiting member; the front limiting member and the valve seat keep a certain minimum distance such that the input valve body has a motion stroke existing between the input valve seat and the front limiting member.

The invention discloses a ductus venosus flushing device. The ductus venosus flushing device comprises a box body and a stamping module, wherein the stamping module is arranged at the top part of the box body, a stop ring is arranged on the side face of the box body, a pulse pump body is in threaded connection with the interior of the stop ring, and a direct current inlet pipe and a pulse outlet pipe are connected to the pulse pump body; the stamping module is of a tubular structure protruding from the box body, and a button is movably arranged in the stamping module; a cavity is formed in the pulse pump body, a flexible diaphragm is arranged in the cavity to divide the cavity into two cavity bodies, and one cavity body is communicated with the direct current inlet pipe and the pulse outlet pipe; and a reciprocating mechanism is arranged in the box body, the reciprocating mechanism is respectively connected with a button and a flexible diaphragm, under the pushing of the button, the reciprocating mechanism drives the flexible diaphragm to move back and forth to generate negative pressure in the pulse pump body, and multi-phase variable-frequency pulse is realized through a gear shifting mechanism.

The invention relates to the field of oil ammonia column forming, and discloses a drop ball forming device and an oil ammonia column forming device. The drop ball forming device comprises a pluralityof drop ball devices (1), wherein the drop ball device (1) comprises a slurry feeding pipe (3), a protective oil feeding pipe (4) and a dripper (8), the slurry feeding pipe (3) is communicated with aslurry tank (10) through a pipeline, the slurry tank (10) is used for providing slurry containing oxide particles for the slurry feeding pipe (3), the protective oil feeding pipe (4) is communicated with a protective oil buffer tank (6), a pulse pump (7) is arranged on a communication pipeline, and the included angle between the arrangement direction of the slurry feeding pipe (3) and the arrangement direction of the protective oil feeding pipe (4) is 10-90 DEG. The device provided by the invention overcomes the defects of slurry blockage and adhesion, can realize accurate control of the droplet size, and can produce pellet catalysts with different particle size requirements.

The invention relates to a device for monitoring the grotto temple air flow field flow velocity dynamic state by utilizing a smoke particle motion trail. The device is structurally characterized in that: an air blower, a pulse pump distributed with a smoke generating pipe and an LED (Light Emitting Diode) plate lamp are arranged in a grotto temple, a pulse pump pipeline is connected with a pulse timing switch, a computer is connected with a storage card, and the storage card is placed in a camera box, a camera is sleeved with an annular LED lamp and supported by a support to stand in the grotto temple; a coordinatometer and a fuming timer are arranged in the grotto temple, a wind direction sensor and a wind speed sensor are arranged along the trend of the grotto temple building and are connected with a data acquisition instrument, and a computer and a mobile phone transmit data to each other. By monitoring the influence of different wind speeds in the grotto temple on the smoke particle motion trail in closed and semi-closed environments, the flow velocity dynamic characteristics of the grotto temple air flow field in different environments are judged. The device is simple in structure, high in practicability and low in cost, is widely applied to research on dynamic characteristics of the air flow field flow velocity in the grotto temple in different environments, and plays a certain role in protecting ancient cultural heritage.

The present invention provides a working system and a working method for a high-frequency oscillating phlegm excretion medical care vest. The working system comprises a controller, a controller detecting signal input end is connected with a driving circuit detecting signal output end, a driving circuit current detecting end is connected with an alternating current power supply source, a controllerpulse pump regulating output end is connected with a pulse pump control circuit input end, a pulse pump control circuit output end is connected with a pulse pump power supply, a controller fan regulating output end is connected with a fan control circuit input end, and a fan control circuit output end is connected with a fan power supply; and a controller protection signal input end is connectedwith a protection circuit protection signal output end, a protection circuit fan detecting end is connected with the fan power supply, and a protection circuit pulse pump detecting end is connected with a pulse pump power supply. A protection circuit can better avoid an overvoltage condition occurring during the use and improves safety. At the same time, the working system controls frequency of apulse pump and a rotation speed of a fan according to different needs and improves applicable ranges.

The invention provides a multi-box pulse-type high-pressure circulating cleaner. The cleaner is characterized in that the cleaner comprises more than two box bodies, discharge discs, trays, dumping devices, a recycling delivery pump, a high-pressure pulse pump, a water inlet pipe, water spray nozzles, a grid, a water outlet pipe, filter devices and a gang switch, wherein the discharge discs are arranged in the box bodies; the trays are arranged on the discharge discs and are densely arranged in a matrix; the dumping devices are arranged below the discharge discs in the box bodies; the recycling delivery pump is used for providing high-pressure water; the high-pressure pulse pump is connected with the recycling delivery pump; the water inlet pipe is connected with the high-pressure pulse pump; the water spray nozzles are arranged on the water inlet pipe and among the trays; the grid is arranged below the dumping devices; the water outlet pipe is arranged below the grid; the filter devices are connected with the water outlet pipe; the box bodies are provided with cover plates connected with the gang switch; and gaps are reserved between the cover plates and containers. The cleaner has the following beneficial effects that: as the high-pressure pulse cleaning method is adopted, the washing time is sufficient to wash multiple (tens of) containers and the containers with a complex structure can be easily cleaned; the containers are arranged on the discharge discs in an array mode; multiple containers can be simultaneously cleaned; the multiple boxes circulate continuously, thus improving the work efficiency, saving manpower and material resources and ensuring low production cost; and the cleaner has a simple structure and is convenient to operate.

The invention discloses a pulse washing device for scale impurities in a high-power motor cooler. The device comprises a drug preparing container, a pulse pump and a precipitate container, wherein the drug preparing container is used for storing a scale impurity softening agent; the pulse pump is connected to a pulse pump liquid inlet pipe and a pulse pump liquid outlet pipe; the pulse pump liquid inlet pipe extends into the scale impurity softening agent in the drug preparing container; the pules pump liquid outlet pipe is connected to a cooler liquid inlet of the cooler; and the precipitate container is correspondingly connected to a cooler liquid outlet of the motor cooler and the drug preparing container. According to the device, the prepared scale impurity softening agent is pumped into the motor cooler through a pneumatic diaphragm pump; the inner part of the motor cooler is intermittently circularly washed with pulse through the pulse function of the pneumatic diaphragm pump, and thus the inner scale and impurities can be softened and flow out together with flushing liquid.