2013results about How to "Reduce running noise" patented technology

The present invention overcomes many of the disadvantages of prior art mobile oil field heat exchange systems by providing an improved frac water heating system. The present invention is a self-contained unit which is easily transported to remote locations. In one embodiment, the present invention includes a single-pass tubular coil heat exchanger contained within a closed-bottom firebox having a forced-air combustion and cooling system. In another embodiment, the present invention includes multiple, single-pass heat exchanger units arranged in a vertically stacked configuration. The rig also includes integral fuel tanks, hydraulic and pneumatic systems for operating the rig at remote operations in all weather environments. In a preferred embodiment, the improved frac water heating system is used to heat water on-the-fly (i.e., directly from the supply source to the well head) to complete hydraulic fracturing operations. The present invention also includes systems for regulating and adjusting the fuel / air mixture within the firebox to maximize the combustion efficiency. The system includes a novel hood opening mechanism attached to the exhaust stack of the firebox.

A full-voltage dental water jet of the invention includes a base, a pump, a suspension stand, a reservoir and a microcomputer control system. The base has a lower case and an upper case. The pump disposed in the lower case has an inlet and an outlet. The suspension stand having at least three engaging portions, a heat dissipating aluminum plate, a first standing portion and a second standing portion is disposed between the pump and the lower case. The reservoir is disposed above the base. The microcomputer control system is disposed in the upper case. The microcomputer control system has the function of adapting the dental water jet to the universal input voltage. In addition, the suspension stand made of the silica gel material reduces the operation noise and the vibration of the pump.

A motor drive control apparatus for controlling a motor has a main control part that performs a flux weakening control by a vector control of d-q axes and a rate-limit control part that controls a rate of change in a d axis current command value in the vector control. Further, there is provided a motor control apparatus for controlling a motor has a motor angular speed detection part that detects a motor angular speed of the motor and a motor control part having a current control system that controls the electric motor based on a motor current and a current command value. The motor control part calculate the current command value in which torque becomes constant by considering characteristics of the current control system based on a motor angular speed detected by the motor angular speed detection part.

A flow regulation vent includes a fixed portion adapted to engage a gas supply conduit and a spring force biased movable portion connected by a hinge to the fixed portion and flowingly connected to the pressurized gas supply. The fixed portion includes a gas flow orifice. The movable portion is pivotally movable between 1) a relaxed position, whereby at a specified minimum operating pressure, the movable portion is pivoted by the spring force away from the fixed portion to a position to establish a first gas washout flow area between the movable portion and the gas flow orifice; and 2) a fully pressurized position, whereby at a specified maximum operating pressure, the pressurized gas offsets the spring force to pivot the movable portion to a position adjacent the fixed portion to establish a minimum gas washout flow area between the movable portion and the gas flow orifice.

In an electromagnetic valve, a valve member is slidably installed in a housing to open and close a valve hole. A moving core is slidably installed in the housing, and a coil generates a magnetomotive force to attract the moving core to one side when it is energized. The valve shaft links a motion of the moving core with a motion of the valve member. A bellows surrounds the valve shaft to form a cylindrical inner space between the valve shaft and itself. The bellows is subjected to both positive and negative pressures to extend and shrink in accordance with the motions of the valve member and the moving core. An inner volume of the inner space increasing and decreasing in accordance with extending and shrinking operations of the cylindrical bellows portion. The opening of the bellows and the valve shaft form a narrow opening passage.

A camera includes a mirror box to which a photographing lens is mounted, an object image being formed on one of an image pick-up device and sensitive film via the photographing lens; a main frame, the mirror box being provided on the main frame; and a shock absorbing device. The one of the image pick-up device and the sensitive film is supported by the mirror box, and the mirror box is supported by the main frame via the shock absorbing device.

An engine ECU executes a program including the steps of: detecting an engine speed NE, engine load, and engine coolant temperature (S100, S110, S115); when determination is made of being in an idle region (YES at S120), determining whether in a cold idle region, a transitional region, or a warm idle region (S130); injecting fuel from an intake manifold injector alone when in the cold idle region (S140); injecting fuel from the intake manifold injector and injecting fuel from an in-cylinder injector at the feed pressure when in the transitional region (S150); and injecting fuel from the in-cylinder injector at the feed pressure when in the warm idle region (S160).

An electrically operated parking brake apparatus that includes an electric motor and a screw mechanism The screw mechanism includes a screw-threaded shaft adapted to be rotationally driven by the electric motor, and a nut member meshing with the screw-threaded shaft, the nut member being movable along the screw-threaded shaft by the rotation of the screw-threaded shaft. The parking brake apparatus also includes a transmission member connected to the nut member for transmitting a brake operating force to a wheel brake, and a rotation preventing unit for preventing the rotation of the screw-threaded shaft so as to hold the brake operating force by fixing the position of the nut member relative to the screw-threaded shaft. The rotation preventing unit in one embodiment is an electromagnetic brake for confining the screw-threaded shaft to a stationary portion of a vehicle body.

In an electromagnetic valve, a valve member is slidably installed in a housing to open and close a valve hole. A moving core is slidably installed in the housing, and a coil generates a magnetomotive force to attract the moving core to one side when it is energized. The valve shaft links a motion of the moving core with a motion of the valve member. A bellows surrounds the valve shaft to form a cylindrical inner space between the valve shaft and itself. The bellows is subjected to both positive and negative pressures to extend and shrink in accordance with the motions of the valve member and the moving core. An inner volume of the inner space increasing and decreasing in accordance with extending and shrinking operations of the cylindrical bellows portion. The opening of the bellows and the valve shaft form a narrow opening passage.

A cyclone dust-separating apparatus of a vacuum cleaner is disclosed. The cyclone dust-separating apparatus includes at least one cyclone having a cyclone body, which rotates air to separate dust or dirt therefrom, which has an air inflow part and an air discharging part, and which is installed in such a manner that a longitudinal axis thereof is substantially horizontally arranged, and a dust collecting unit to store the dust or dirt separated by the cyclone unit. The cyclone body is formed in a convex cylinder shape, so that a diameter thereof in the vicinity of an entrance of the air discharging part through which the air is discharged comes maximum.

An air purifier includes a main body defining an air passage therein to allow sucked air to pass therethrough prior to being discharged, and a first filter installed in the main body to be switched between a closed state and an open state. The first filter removes contaminants from the sucked air in the closed state, and allows the sucked air to pass through the air passage in the open state. The air purifier may include a main body to suck and discharge air, with a bypass passage formed in the main body so that the bypass passage is opened or closed by a door, and a first filter installed in the main body. The sucked air passes through the first filter prior to being discharged when the door is closed, and passes through the bypass passage prior to being discharged when the door is opened.

Disclosed herein is an electronic disc brake in which driving force of a motor may be transmitted to a gear unit in a serial manner. The electronic disc brake which has a carrier, a caliper housing, a pair of pad plates disposed at both sides of a disc, and a piston installed within a cylinder part and pressing one of the pair of pad plates toward the disc, includes a spindle member passing through the rear wall of the caliper housing and rotated within the cylinder part, a nut member screw-connected to the spindle member and pressing the piston or releasing pressing of the piston, a motor generating driving force, and a cycloid reducer amplifying the driving force generated from the motor and transmitting the amplified driving force to the spindle member, and the motor, the cycloid reducer and the spindle member are coaxially connected in series.

An accessory heat exchanger unit for heating the fuel oil used by the frac oil heater system of the invention prior to combustion. The accessory heat exchanger unit receives and distributes the fuel oil through a plurality of heat exchanger tubes prior to directing the oil to the combustion chamber. The unit also includes an inlet for receiving heated treatment fluid from the frac water heater system of the present invention. The heated treatment fluid passes over the plurality of heat exchanger tubes of the accessory heat exchanger unit prior to being directed to the outlet of the accessory heat exchanger unit. By heating the fuel oil prior to combustion, the accessory heat exchanger unit greatly improves the viscosity and flow rate of the fuel oil, thereby allowing cheaper, less cold-tolerant grades of fuel oil to be used in extreme cold climates with no degradation in the operation of the frac water heater system of the present invention.

The invention relates to a differential pressure power pressure booster, which is applied to the technical field of natural gas exploitation. The pressure of a high-pressure gas well is used for increasing the pressure of a low-pressure gas wall. A driving cylinder is oppositely connected with a compressing cylinder; a piston rod is arranged between the driving cylinder and the compressing cylinder; the left cavity of the driving cylinder is communicated with a high-pressure left gas inlet and outlet pipe, and the right cavity of the driving cylinder is communicated with a high-pressure right gas inlet and outlet pipe; the high-pressure left gas inlet and outlet pipe and the high-pressure right gas inlet and outlet pipe are connected with a two-position four-way change valve respectively; the two-position four-way change valve is connected with a high-pressure gas inlet pipe; the left cavity and the right cavity of the compressing cylinder are provided with a low-pressure gas inlet and a compressed low pressure gas outlet respectively; and a low-pressure gas inlet pipeline is fixed with a check valve, is connected with a low-pressure gas inlet pipe through the check valve, and is connected with an outlet pipe of the compressing cylinder through the check valve. The differential pressure power pressure booster has the advantages of exploiting natural gas of the low-pressure gas wall by using natural gas of the high-pressure gas well as a driving force under the condition of no external power source, saving a great amount of production cost, and effectively protecting strata pressures.

The invention relates to a night operation control method of washer, comprising the following steps: providing a power supply for a control part; collecting time information from the clock by the control part; identifying the collected time by the control part as the night state and reducing the operation noise of the washer. The noise of the washer during operating at night is reduced, thereby preventing the noise from disturbing the user rest or sleep and the method can provide comfortable operation environment at night.

Hybrid cables, a process for obtaining such and a composite fabric usable in a tire incorporating the hybrid cables are disclosed. A tire and a mounted assembly which each incorporate such a composite fabric is also disclosed. The hybrid cable has a ratio of final tangent modulus:initial tangent modulus greater than 10. This hybrid cable consists of a textile core of an initial modulus of less than 900 cN / tex and a textile wrap of an initial modulus greater than 1300 cN / tex which is helically wound around the textile core.

The invention relates to a structure of a motor stator core and a cooling method for a motor stator based on the structure of the motor stator core. The structure is characterized in that the stator core is formed by splicing and combining stator yoke units and stator tooth units, wherein the quantities of the stator yoke units and the stator tooth units are the same, and are equal to the slot number Z1 of a stator; the stator yoke units and the stator tooth units are formed by laminating oriented silicon steel sheets; a stator yoke unit is connected between every two adjacent tooth units; the tooth units and the stator yoke units are in joggle joint; the silicon steel sheets of the stator yoke units are oriented circumferentially; and the silicon steel sheets of the stator tooth units are oriented radially. The cooling method is selected from one of air cooling, water cooling and oil cooling. The structure has the advantage that the motor has the characteristics of low ferromagnetic loss, high efficiency, low torque pulsation, low slot effect, low running noise, low wind resistance, high slot fullness rate of a stator winding, high utilization ratio of a silicon steel sheet material, suitability of the stator for automatic mass production and the like.

The invention provides a refrigerating system, a refrigerator with the same and a control method thereof, wherein the refrigerating system comprises a compressor, a condenser, a switching unit, a refrigerating chamber capillary, a refrigerating chamber evaporator, a variable-temperature chamber capillary, a variable-temperature chamber evaporator and a freezing chamber evaporator, wherein an inlet of the condenser is connected with an outlet of the compressor; the switching unit is provided with an inlet, a first outlet and a second outlet, and the inlet of the switching unit is connected with the outlet of the condenser; the inlet of the refrigerating chamber evaporator is connected with the first outlet of the switching unit through the refrigerating chamber capillary; the inlet of the variable-temperature chamber evaporator is connected with the second outlet of the switching unit through the variable-temperature chamber capillary; and the inlet of the freezing chamber evaporator is connected with the outlet of the variable-temperature chamber evaporator and the outlet of the refrigerating chamber evaporator, and the outlet of the freezing chamber evaporator is connected with the inlet of the compressor. The refrigerator using the refrigerating system provided by the invention has the advantages of low noise, low energy consumption and low cost.

A shutter opening / closing control device is proposed which can reduce an operation noise of the shutter without increasing the manufacturing cost. The shutter opening / closing control device includes a grille shutter for opening and closing a grille opening which introduces the outside air into the engine compartment, a shutter opening and closing operating portion having a drive source for operating the shutter to be open or to be closed, a closing operation judging portion for judging whether or not the grille shutter is operated in a closing direction based on the vehicle information and a drive source torque controlling portion for controlling the drive source of the shutter opening / closing operating portion to operate the grille shutter first by a high torque and thereafter by a low torque which is lower than the high torque when the grille shutter is judged to be operated in the closing direction by the closing operation judging portion.

A torsionally flexible coupling has a hub ring and a vibrationally isolated pulley surrounding the hub ring at a radial distance, a spring body made of a rubber-elastic material being situated in the gap formed by the distance, and comprises a sliding-contact bearing for mutual support of the hub ring and the pulley, the sliding-contact bearing having a sliding-contact surface on the side facing the hub ring or the pulley, the sliding-contact surface having at least one elastically flexible projection in the radial direction which comes in contact with the surface of the hub ring or the pulley under elastic prestress.

The invention discloses a cooling control method for a vehicle-mounted power battery of a hybrid electric vehicle, which comprises the following steps: acquiring related parameters of a battery collected by a battery management system sensor, and calculating the heating value of the battery in unit time according to the related parameters; calculating the theoretical heat exchange value of the battery surface in unit time according to the heating value of the battery, the surface temperature of the battery and the temperature of cooling air at air inlets / outlets of a battery pack based on the heat transfer theory; determining the cooling air quantity in unit time according to the temperature of cooling air at the air inlets / outlets of the battery pack and the theoretical heat exchange value; and changing a blower output signal to enable a blower to output the calculated cooling air quantity. The cooling control method disclosed by the invention has the characteristics of correcting the air quantity of the blower in real time and ensuring the smooth temperature change of the battery according to the change trend of the surface temperature of the battery.

The present invention relates to a control apparatus 700 for controlling a high-pressure fuel supply pump 100, a computer program product comprising computer program code means configured to adapt a control apparatus 700 for controlling a high-pressure fuel supply pump 100, and a method for controlling a high-pressure fuel supply pump 100 configured to supply pressurized fuel to an internal combustion engine. The high-pressure fuel supply pump 100 comprises a normally-closed type solenoid actuated intake valve 110 configured to be opened or kept open by magnetic force. A control current IC of the solenoid actuated intake valve 110 is controlled for opening the solenoid actuated intake valve 110 by applying a control voltage VC to the solenoid actuated intake valve 110. Controlling a control current IC of the solenoid actuated intake valve 110 comprises increasing the control current IC to a first control current value IC1 for energizing the solenoid actuated intake valve 110. Controlling a control current IC of the solenoid actuated intake valve 110 for opening the solenoid actuated intake valve 110 according to the present invention further comprises reducing the control current IC from the first control current value IC1 to a second control current value IC2 being smaller than the first control current value IC1.

The invention discloses a vertical lifting container, which comprises a container body, a corbel for holding a pallet is respectively on the two sides of the container, a passage for the lifting platform to run from top to down is left between the cornels on the two sides of the container body, a lifting platform is hung in the passage through a lifting chain, one side of the container is provided with a goods outlet, the pallet for transporting into or out the goods is arranged in the goods outlet, and a drive device drives the pallet to translate. In the vertical lifting container of the invention, the pallet device is driven by a chain wheel device to smoothly and stably run, a guide device is arranged to further guarantee the smoothness of the pallet during the processes of drawing and withdrawing, so as to improve the operating efficiency of the goods and reduce running noise, and a chain tensioner can adjust the tension of the chain to avoid the swaying phenomenon and to enable the adjustment of the horizontal position of the lifting platform to be convenient. Since a guide upright similar to a guide rail is arranged, the vertical lifting platform can ensure the smoothness of the lifting platform and prevent the surface of the lifting platform from being oblique and shifted.

The present disclosure relates to a wind turbine blade, in particular a wind turbine blade having devices or structures for reducing noise generated by the wind turbine blade during use and related method. The wind turbine blade comprises at least a first longitudinal section having a cross section perpendicularly to a longitudinal direction, the cross section having a plurality of flow modulating devices including a first primary flow modulating device and a secondary flow modulating device for modulating noise spectra, wherein the first primary flow modulating device and the first secondary flow modulating device are spaced perpendicularly to the longitudinal direction. Also disclosed is a method of retrofitting a wind turbine blade.

A cyclone dust-separating apparatus of a vacuum cleaner is disclosed. The cyclone dust-separating apparatus includes at least one cyclone having a cyclone body, which rotates air to separate dust or dirt therefrom, which has an air inflow part and an air discharging part, and which is installed in such a manner that a longitudinal axis thereof is substantially horizontally arranged, and a dust collecting unit to store the dust or dirt separated by the cyclone unit. The cyclone body is formed in a convex cylinder shape, so that a diameter thereof in the vicinity of an entrance of the air discharging part through which the air is discharged comes maximum.

The invention discloses an air port adjustable static pressure box with uniform outlet air, which comprises a static pressure box shell, an air inlet, an air outlet and a silencing material adhered to the inner surface of the static pressure box shell, wherein a hole plate is arranged in the middle of the static pressure box shell and located above the air inlet, a partition plate is arranged below the hole plate, the space in the static pressure box shell is divided into a steady flow region, and an inlet air region and an outlet air region by the hole plate and the partition plate; and a groove is arranged at the bottom of the outlet air region of the static pressure box shell, a vertical flow guiding section is formed by extending a certain distance downwards along the groove, a slot is arranged at one side of the groove, and a regulating plate with a flow guiding arc section is installed on the slot and moves in the vertical flow guiding section through the depth extending into the slot to regulate outlet air amount of the air outlet. Through introducing the partition plate and the hole plate, the flowing distance of air is lengthened, the ratio of dynamical pressure converted to static pressure is increased, the uniformity of the outlet air is enhanced, the operation noise of equipment is reduced, the requirements for outlet air of the seam air inlet are better satisfied, and the application range of a static pressure box is widened.