33results about How to "Reduce front and rear pressure difference" patented technology

The invention provides a multi-cylinder two-stage variable-capacity compressor system. The multi-cylinder two-stage variable-capacity compressor system comprises a compressor in which a plurality of sets of rotating type compression mechanism parts are contained, wherein the compression mechanism parts comprise at least one high-pressure-stage rotating type compression mechanism part and at least two low-pressure-stage rotating type compression mechanism parts; one compression mechanism part in the low-pressure-stage compression mechanism parts is provided with a variable-capacity switching mechanism and further comprises an intermediate communicating pipeline introducing air suction pressure or intermediate pressure of the compressor to the variable-capacity switching mechanism. Air suction pressure or intermediate pressure is introduced to the variable-capacity mechanism by the multi-cylinder two-stage variable-capacity compressor so that the running modes of the variable-capacity compressor can be changed, the front and back pressure difference (between the head and the tail of a pin nail) of the variable-capacity mechanism is reduced, leakage loss caused by pressure difference is reduced, and the running efficiency of the compressor can be improved. The invention further relates to a control method of switching of running modes of the multi-cylinder two-stage variable-capacity compressor system.

The invention discloses an improved multifunctional butterfly plate based on an electric planer type shaft structure and a butterfly valve formed by the improved multifunctional butterfly plate. The two sides of the butterfly plate are respectively provided with an arch spherical protrusion, the arch spherical protrusion, on one side with a fluid inlet, of the butterfly plate is provided with three flow dividing channels used for flow division and pressure reduction, and the arch spherical protrusion, on one side with a fluid outlet, of the butterfly plate is provided with four flow dividing channels used for flow division and pressure reduction and provided with an installation hole part used for installing the butterfly plate in the radial direction. The multifunctional butterfly plate is improved based on a structure of a traditional butterfly plate of a standard flange type soft seal butterfly valve, high flowing speed of fluid passing through the butterfly plate can be reduced, the flow dividing channels can have the functions of flow division, pressure reduction, cavitation prevention, vibration prevention and noise reduction, and moreover when the butterfly valve is closed, the seal performance of a valve body can be improved.

The invention discloses a novel magnetic control butterfly valve. An electromagnetic controller is mounted on a valve body; an electromagnet is arranged inside the electromagnetic controller; a butterfly plate provided with a permanent magnet is mounted in an inner chamber of the valve body; an upper valve cover and a lower valve cover are fixed at the upper and lower ends of the valve body by boltsrespectively; the permanent magnet is fixed at the middle part of one end face of the butterfly plate; an upper shaft sleeve and a lower shaft sleeve which are coaxial to each other are fixed at the upper and lower parts of the end face, where the permanent magnet is positioned, of the butterfly platerespectively; the upper shaft sleeve and the lower shaft sleeve are matched and connected with the upper valve cover and the lower valve coverrespectively by an upper valve rod and a lower valve rod so that the butterfly plate can be mounted between the upper valve cover and the lower valve cover inside the valve body to form limited rotation; the other end face of the butterfly plate is provided with one inlet flow path and two outlet flow paths. The novel magnetic control butterfly valve disclosed by the invention is driven to rotate by rotation of the electromagnet inside the electromagnetic controller, so that the butterfly valve is controlled tobe opened and closed; the control theory of the butterfly valve is changed; flow division and decompression are carried out to reduce cavitation corrosion; vibration is prevented; noise is reduced; leakage problems of the butterfly valve are reduced; the working performance of the butterfly valve is improved; the butterfly valve is applicable to various occasions.

The invention discloses a gate valve with a function of reducing cavitation damage of a valve plate. The gate valve comprises a drive mechanism, a valve rod, a support, a valve cover, a valve body, gate plates, a sealing face, a coupler and a wedge block. A drive mechanism rotary shaft drives two gate plates in the valve cover and the valve body to vertical move through the coupler and the valve rod, the inner lateral face of the valve body is welded with the sealing face, and the wedge block and the valve rod are coaxially installed on the lower bottom surface of the valve body. The gate valve is characterized in that the lateral faces of the lower portions of the gate plates are provided with inner comb teeth and outer comb teeth, the front inner comb teeth, the front outer comb teeth, the back inner comb teeth and the back outer comb teeth are distributed in a staggered mode, and the thickness of the inner comb teeth is twice of that of the outer inner comb teeth. The gate valve is provided with the two gate plates, the gate plates are contacted with the sealing face when the valve is closed and opened, and good sealing performance of the sealing face and the gate plates is achieved through tensile force of the wedge block. In addition, the opening degree is small, fluid plays the flow-shunting and pressure-reducing effect and reduces front and back pressure drop of the gate plates when passes through the comb teeth on the gate plates, and a cavitation phenomenon of the valve is decreased.

The invention discloses a protective valve, a compressor and an air conditioner. The compressor comprises a compression cylinder, a liquid storage tank and a pressure valve. An air cylinder and an exhaust cavity communicating with an air outlet of the air cylinder are arranged in the compression cylinder. The liquid storage tank communicates with an air inlet of the air cylinder. One end of the pressure valve communicates with the exhaust cavity, and the other end of the pressure valve communicates with the liquid storage tank. The pressure valve is in an open state when the pressure of the exhaust cavity is lower than a preset threshold value and is in a closed state when the pressure of the exhaust cavity is higher than the preset threshold value. According to the compressor, the pressure valve is arranged in a refrigerant circuit, when refrigerants are injected into the compressor, the pressure valve is in the open state since the pressure of the exhaust cavity is lower than the preset threshold value, part of the refrigerants can enter the liquid storage tank through the pressure valve, the front-back pressure difference of the air cylinder before the compressor is started is small, and the compressor protection effect is achieved.

Embodiments of the present invention provide a control method, device and air conditioner for reducing noise by controlling pressure difference, and relate to the technical field of air conditioners. The method includes: judging whether the air conditioner is switched from the non-heating mode to the heating mode and the air conditioner continues to run in the heating mode for a preset time after the four-way reversing valve of the air conditioner performs a reversing action; The first pressure of the pipeline before the throttle valve of the internal machine and the second pressure of the pipeline after the throttle valve of the internal machine; subtract the second pressure from the first pressure to obtain the pressure difference before and after the throttle valve of the internal machine; The pressure difference before and after the throttle valve controls the opening of the throttle valve of the internal unit and the throttle valve of the external unit of the air conditioner, so as to reduce the pressure difference between the front and rear of the throttle valve of the internal unit. This method can adjust the opening of the throttle valve of the internal unit and the throttle valve of the external unit according to the pressure difference before and after the throttle valve of the internal unit, so as to reduce the pressure difference before and after the throttle valve of the internal unit, thereby reducing the flow rate of the refrigerant , reduce noise and improve the comfort of indoor users.

The invention provides a storage tank pressurization type copious cooling liquid air energy storage system. A liquid air storage tank is connected with a pressurization device. The pressurization device is used for increasing the pressure in the liquid air storage tank and making the pressure in the liquid air storage tank be larger than the pressure of gas recycled by an air compressor unit. In this way, the saturation temperature of air liquefaction is increased while the pressure of the liquid air storage tank is improved, so that the needed refrigerating capacity is reduced, the flow of a refrigeration expander is reduced, the air circulation amount in a system is reduced, the power consumption of a circulating compressor is reduced, and the system efficiency is improved.

The invention discloses a filtering process and a filtering system for use in preparation of an injection liquid medicament. The filtering process comprises the following steps of: preparing an injection in a preparation container (1), circulating by using a liquid medicament pump (2), filtering through a group of polypropylene filter cores (3), and reflowing a filtered solution into the preparation container (1) through a small circulating pipeline (8); and filtering by connecting the same group of polypropylene filter cores (3) with two groups of polyether sulfone filter cores (4, 7), forming a discharge port on a large circulating pipeline (5) behind the two groups of polyether sulfone filter cores, connecting the discharge port with the preparation container (1), and supplying a liquid medicament through another large circulating pipeline to perform production and quality detection of an injection. Through large and small circulations, impurities, heat sources, pigments and the like in the liquid medicament are removed effectively, and the aim of refining the liquid medicament is fulfilled; the filtering loads of the polypropylene filter cores and the pressure difference between moments before and after steam sterilization are lowered; and the use of active carbon in the conventional process is reduced, the requirement of environmental protection is better met, the possibility of adsorption of major components by active carbon is avoided simultaneously, and the quality of the liquid medicament is ensured.

The invention discloses a multiple on-line system and a mode switching control method thereof. The method includes the following steps that when any of a plurality of indoor units receives a mode switching instruction, the indoor unit sends the mode switching instruction to a flow distribution device; when judging that the indoor unit is switched into a heating mode from a refrigerating mode according to the mode switching instruction, the flow distribution device controls a refrigerating control valve corresponding to the indoor unit to be closed, and before controlling a heating control valve corresponding to the indoor unit to be opened, the flow distribution device adjusts the opening degree of a first throttling element so that the front and back pressure difference of the heating control valve corresponding to the indoor unit can be reduced. According to the method, when the indoor unit is switched into the heating mode from the refrigerating mode, the front and back pressure difference of the heating control valve is reduced by adjusting the opening degree of the first throttling element in the flow distribution device, and therefore noise generated during mode switching is lowered, and user experience is improved.