737 results about "Piston pump" patented technology

A pump system includes a housing defining a first internal volume and a second internal volume, a first piston positioned to separate the first internal volume into a first chamber and a second chamber, a second piston positioned to separate the second internal volume into a third chamber and a fourth chamber, a first inlet check valve configured to permit fluid flow into the first chamber, a second inlet check valve configured to permit fluid flow into the third chamber, a directional control valve (DCV) repositionable between (a) a first position where the DCV is configured to fluidly couple the second chamber to a high pressure fluid source and (b) a second position where the DCV is configured to fluidly couple the fourth chamber to the high pressure fluid source, and a relief valve configured to supply a fluid to the DCV through an orifice to move the DCV.

The invention discloses an oil supply control system of a hydraulic pump station, and relates to the technical field of hydraulic systems. The oil supply control system of the hydraulic pump station comprises an oil tank; the oil inlet end of the oil supply pump communicates with the oil tank, and the oil outlet end of the oil supply pump is connected to the oil suction end of the variable plunger pump through an oil supply path; a heat exchanger and a filter are sequentially arranged in the oil supply path and used for conducting temperature adjustment and particle filtration on oil. The oil supply path is connected with a bypass pipeline in parallel, the bypass pipeline is communicated with the oil tank through a one-way valve, the opening pressure of the one-way valve is smaller than 2 bar, and the one-way valve is used for guaranteeing the positive pressure of the oil suction end of the variable pump. The oil outlet end of the variable displacement piston pump is connected to an external hydraulic system and is provided with a high-pressure filter; the detection device is arranged in the oil supply path and used for collecting oil temperature and / or pressure signals; and the control module is connected with the detection device and the execution components and is configured to control the start and stop states of the oil supply pump, the variable displacement piston pump and the heat exchanger according to the comparison result of the detection result and a preset threshold value.

The invention relates to a reciprocating piston pump (1, 1') with a pump housing (2) through which fluid flows and a pump axis (10), and an axially movable pump piston (19) through which fluid flows, arranged coaxially to two housing-fixed toroidal coils, namely a first toroidal coil (12') and a second toroidal coil (12''), wherein the reciprocating piston pump (1) has two inlet valves, namely a first inlet valve (20') and a second inlet valve (20''), and two outlet valves, namely a first outlet valve (21') and a second outlet valve (21''),wherein the first inlet valve (20') and the first outlet valve (21') are arranged concentrically to the pump axis (10) within the first annular coil (12') and the second inlet valve (20') and the second outlet valve (21') are arranged concentrically to the pump axis (10) within the second annular coil (12''), and the pump piston (19) is guided in a two-part guide sleeve or directly in the pump housing (2) in a two-part displacement chamber.

The invention belongs to the technical field of plunger sealing of high-pressure plunger pumps, and particularly relates to a high-pressure plunger pump plunger assembly self-compensation type abrasion-resistant sealing structure which comprises a high-pressure plunger pump body and an oil suction and outlet tank, the right end of the high-pressure plunger pump body is connected with the oil suction and outlet tank, and a fixing assembly is detachably installed at the right end of the interior of the high-pressure plunger pump body. And the right end of the fixing assembly communicates with the left end of the inner wall of the oil suction and outlet tank, a first sealing structure is detachably installed at the right end of the interior of the fixing assembly, and the high-pressure plunger pump main body is used for driving the first sealing structure to conduct fine opening and closing operation. The friction coefficient of the sealing structure is reduced, and the friction heat conductivity coefficient of the plunger assembly is reduced, so that the wear resistance of the sealing structure is improved, material aging caused by temperature rise is prevented, multiple times of self-compensation can be conducted on a wear gap, and then the durability of the sealing structure is greatly improved.

The invention discloses a digital hydraulic pump controlled by a high-speed switch valve bridge. The digital hydraulic pump comprises a motor, a swash plate type axial plunger pump, a variable adjusting unit, a pressure compensation unit, a closed-loop control unit, an unloading unit and a filter. The motor is connected with the swash plate type variable displacement piston pump; the variable adjusting unit is connected with the swash plate type variable plunger pump; the pressure compensation unit is connected with the variable adjusting unit to carry out differential pressure compensation on the variable adjusting unit; the closed-loop control unit is connected with the variable adjusting unit and controls the output flow of the variable adjusting unit according to a feedback signal; the high-speed switch valve is subjected to pressure difference compensation through the pressure difference compensator, so that the flow of the high-speed switch valve is not affected by load changes any more, and output pressure fluctuation of the swash plate type variable displacement piston pump is reduced; a high-speed switch valve bridge serves as a pilot level, and digital accurate control over the output pressure of the hydraulic pump is achieved through a closed-loop control unit; the high-speed switch valves are connected in parallel, multi-stage flow output and differential flow control are achieved, and the control precision and the response speed of the digital hydraulic pump are improved.

The invention relates to the technical field of injection molding machine hydraulic control, in particular to an injection molding machine hydraulic pump control system and a control method thereof, and aims to solve the problems of high energy consumption, high cost or poor temperature control of a traditional hydraulic scheme. The system comprises a hydraulic oil tank, a driving unit and an oil way control module. The driving unit comprises a driving motor, and a fixed displacement pump and a plurality of swash plate type variable displacement piston pumps which are driven by the driving motor, and swash plates of the variable displacement pumps can be switched between negative and positive angles so as to adjust the displacement or actively suck oil; the oil way control module is provided with a flow collecting valve set capable of switching flow collecting / independent states of oil outlet ways of the constant displacement pump and the variable displacement pump, the integrated cooling unit forms an independent cooling filtering loop, the temperature and pressure adjusting assembly is combined with a temperature sensor to control temperature and adjust pressure, and the pressure limiting protection valve set is connected with the constant displacement pump and the variable displacement pump. And the pressure limiting protection valve is matched with a pressure sensor to realize overpressure protection. According to the invention, cost and energy saving are both considered, precise temperature control and pressure protection are realized, and system stability and plastic part forming precision are improved.

The invention discloses a liquid pumping assembly of a hydraulic slurry pump and the hydraulic slurry pump adopting the liquid pumping assembly. The liquid pumping assembly of the hydraulic slurry pump comprises a left oil cylinder, a square box with a box cover, a cylinder sleeve, a pump head, a liquid outlet assembly and a right oil cylinder which are sequentially connected from left to right. The right end of the first power output shaft is connected with a piston capable of transversely moving in the cylinder sleeve through a movable connecting piece located in the square box. A top oil cylinder is vertically arranged at the top end of the pump head, a second power output shaft partially located in an inner cavity of the pump head is vertically arranged at the top of the top oil cylinder, and a first sealing valve is arranged at the bottom end of the second power output shaft. A pump head liquid outlet is formed in the right end of the pump head, a right oil cylinder is transversely arranged at the right end of the liquid outlet assembly, a third power output shaft partially located in an inner cavity of the liquid outlet assembly is transversely arranged in the right oil cylinder, and a second sealing valve is arranged at the left end of the third power output shaft; the liquid outlet assembly is provided with a liquid drainage hole communicated with an inner cavity of the liquid outlet assembly. The invention has the characteristics of stable and accurate flow and pressure and high stability.

A system (10) for treating produce includes an application system (12) for applying a treatment liquid to the produce. A piston pump (20) is connected in liquid flow receiving communication with a source of treatment liquid (16), and also is connected in liquid flow expelling communication with an application line (18) leading to the application system. A control system (22) controls the operation of the piston pump to pump a selected dosage of the treatment liquid from the source of treatment liquid (16) to the application system (12).

The invention provides a plunger pump fault online diagnosis method based on a rotating speed frequency amplitude, which belongs to the field of plunger pump state detection and mainly comprises the steps of pressure sensor data acquisition and processing, load pressure spectrum analysis and plunger pump fault diagnosis based on the rotating speed frequency amplitude. The method comprises the specific steps that a high-frequency pressure sensor is arranged at an outlet of a plunger pump, and real-time data input is provided for fault diagnosis; a pressure signal conditioning and digital-to-analog conversion device is built, data transmission is completed, and data interfering with fault diagnosis is eliminated; fourier transform is carried out on the processed pressure signal to extract the rotating speed frequency of the plunger pump; and the specific fault type is judged based on the corresponding relation between the rotating speed frequency amplitude of the plunger pump and the specific fault. According to the method, based on the difference of the rotating speed frequency component amplitudes of load pressure signals under different plunger pump friction pair abrasion fault types, the mapping relation between the rotating speed frequency amplitudes and the plunger pump friction pair abrasion fault types is established, and the plunger pump load pressure signals serve as data input; and the specific wear fault type of the friction pair of the plunger pump is monitored and evaluated in real time. According to the invention, state monitoring and condition-based maintenance of the plunger pump are facilitated.

The invention relates to the technical field of industrial automation, and discloses a multi-mode switching control method for a variable displacement piston pump driven by a servo motor, which comprises the following steps of: acquiring multi-dimensional operation state parameters and load power of a variable displacement piston pump system; performing dynamic mode decomposition on the load power signal, and executing preset state switching compensation mapping to complete mode switching on the basis of the extracted mode characteristics and the current state parameter under the condition of judging that the switching condition is satisfied; executing a corresponding control strategy in the new mode, and dynamically adjusting the pump displacement and the rotating speed of the servo motor through feedback control; and detecting the response and energy efficiency performance of the regulation and control system according to the performance index in the system operation process. By adopting a dynamic mode intelligent switching mechanism, the system can automatically match the optimal operation mode in different working environments, the energy utilization efficiency is greatly improved, and the effects of effectively reducing energy waste and reducing the total energy consumption of the system during stable load or low load operation are achieved.

A piston pump for a high-pressure cleaning device is provided, having a pump housing, which includes a first housing part and a second housing part. The first housing part forms a suction conduit and a pressure conduit, and the second housing part forms a plurality of pump chambers into each of which a reciprocally movable piston dips and which are each in flow connection with the suction conduit by way of an inlet channel and with the pressure conduit by way of an outlet channel. The inlet channel can be closed by an inlet valve and the outlet channel can be closed by an outlet valve. The second housing part includes a valve receptacle, and that the piston pump includes an outlet valve assembly, wherein the outlet valve assembly comprises an outlet part, which is inserted into the valve receptacle and forms all outlet valve seats.

The utility model discloses a quantitative blanking vertical mill with an anti-clogging function, which relates to the technical field of vertical mills and comprises a support, a tank is arranged at the top of the support, a first motor is mounted at the bottom of the tank, an output end of the first motor is connected with a millstone, a grinding roller is arranged in the tank, and the millstone is connected with an output end of the first motor. Through the arrangement of a second motor, a supporting frame, a feeding port, a smashing roller, a discharging port, a piston pump, a feeding pipe and a discharging pipe, materials enter the supporting frame through the feeding port, the second motor is started, and after the second motor is started, the second motor drives the smashing roller to rotate, so that the materials can be smashed, and blockage of the materials is prevented; the second motor can drive the connecting rod to rotate synchronously when rotating, the pushing rod arranged outside the connecting rod in a sleeving mode can push the piston rod to move in a reciprocating mode, the materials enter the tank body through the discharging pipe, and therefore the purpose of quantitative discharging is achieved.

The invention relates to the technical field of piston pump leaking stoppage, and discloses a flow leaking stoppage device for a piston pump, which comprises a leaking stoppage clamp, the leaking stoppage clamp comprises a first clamp component and a second clamp component which are symmetrically arranged, and the first clamp component and the second clamp component are in a T shape rotating 90 degrees anticlockwise. A vertical pipe and a transverse pipe are clamped in the first clamp component and the second clamp component, inner cavities are formed in the first clamp component and the second clamp component, the inner cavities form a complete closed cavity when the first clamp component and the second clamp component are combined, and a first rubber pad is fixedly connected to the inner ring shell wall of the first clamp component and the inner ring shell wall of the second clamp component. After the inner cavity is filled with cooling water, the leaking stoppage clamp forms a wrapping type cooling clamp, the cooling effect on the pump cavity is achieved, the possibility that the sealing effect is reduced and water leakage is caused due to the fact that the temperature of the pump body is too high and the rubber sealing piece is thermally deformed is reduced, the leakage risk is reduced, and the service life of the piston pump is prolonged.

The application discloses a high-bearing-column-piston pump friction pair friction and wear testing machine, wherein the lower sample is installed on a lower sample clamp, the lower end of the lower sample clamp is provided with a lifting mechanism for driving the vertical movement of the lower sample to make the lower sample contact or separate from the upper sample, and the upper end of the upper sample is connected with a rotary driving device for driving the rotation of the upper sample through an upper sample clamp. The loading of the testing machine is matched with a lead screw through an optimized mechanical structure design, the loading precision is high, the accuracy of experimental results is improved, stepless loading can be realized, and the testing machine is suitable for the friction and wear characteristic research of friction pairs under various pressures; the testing machine is provided with an oil collecting mechanism, the oil at any moment during the experiment can be collected, the change of the physicochemical indexes of the oil during the whole experiment can be detected, and the influence of the change of the physicochemical indexes of the oil on the friction and wear of the friction pair can be accurately analyzed.

The utility model belongs to the technical field of energy conservation, consumption reduction and conveying of beam-pumping unit wells in oil fields, and discloses an energy-saving and pressure-reducing conveying device of a beam-pumping unit, which comprises a base, the beam-pumping unit is arranged on the base, and a connecting assembly is arranged at the position close to one end of the beam-pumping unit. A piston pump assembly is fixedly installed at the other end of the connecting assembly, the other end of the piston pump assembly is rotationally installed on the base at the same time, the side wall, close to the connecting assembly, of the piston pump assembly is communicated with an overflow pipe assembly, the other end of the piston pump assembly is further communicated with a process manifold, and a control box is further installed at the position, close to the beam-pumping unit, of the base. The device is simple in overall structure, feedback energy can be directly used for production operation, energy conversion links are reduced, meanwhile, the requirement for reducing the pressure of oil well produced liquid is met, and therefore stable operation of equipment is guaranteed, and the using effect is improved.

A piston pump is described for pumping a liquid including a head in which at least a cylinder is disposed, a piston slidably inserted in the cylinder, a first sealing annular gasket which circumferentially sealingly contacts the piston, a second sealing annular gasket which circumferentially sealingly contacts the piston, and an annular body which circumferentially encloses the piston and is at least partially accommodated in a housing seat disposed in the head in a portion of the cylinder. The annular body includes a first housing seat in which the first sealing annular gasket is housed, a second housing seat in which the second sealing annular gasket is housed, and a third housing seat in which a third sealing annular gasket is housed, which is placed between the annular body and the housing seat of the annular body.

The invention belongs to the technical field of equipment special for petrochemical engineering, and particularly relates to the technical field of oil-gas mixture conveying, in particular to an intelligent multiphase booster pump device which is used for pumping a gaseous medium, a liquid medium or a gas-liquid mixed medium. The booster pump comprises a support, a pump driving device and a pump cylinder component. And the booster pump pre-mixes the pumping medium on the basis of adjusting the power of the motor and / or the acting area difference of the two sides of the inner cavity, so that the pumping medium is not subjected to phase splitting within the preset lift. Piston driving is innovatively adopted to achieve oil-gas mixed transportation, compared with an existing mixed transportation pump, the gas carrying amount is larger, the asymmetric piston pumping mode is adopted, and based on the pressure difference of a left cavity and a right cavity in a cylinder, compression and premixing of pumping media are quite efficiently achieved; under the condition that oil-gas separation equipment and heating equipment are not used, the fact that the piston pump with ultrahigh pumping efficiency is used for conveying the oil-gas mixture is achieved, and the pumping efficiency of the oil-gas mixture is greatly improved.

The invention relates to the technical field of plunger pumps, in particular to a variable flow plunger pump which comprises a driving unit, a plurality of variable pumps, a plurality of variable flow executing mechanisms and a transmission mechanism. The variable pumps are connected with the driving unit; the variable flow executing mechanisms are connected with the variable pump. The transmission mechanism comprises a plurality of driving transmission parts and a driven transmission part, the driving transmission parts are located on the outer side of the driven transmission part and connected with the driven transmission part, and the driving transmission parts are connected with the variable flow executing mechanism. According to the variable-flow plunger pump, the variable pump is driven by the driving unit to output variable-flow hydraulic oil, large-range real-time adjustment of flow can be achieved through cooperation of the variable pump and the variable-flow executing mechanism and variable-flow control, adjustment is accurate, and large-torque output of the variable-flow executing mechanism at different rotating speeds is guaranteed; the multiple driving transmission pieces drive one driven transmission piece to rotate, stress is uniform, the abrasion loss is reduced, and the structure is more compact.

The utility model discloses a novel piston-free pump head which comprises a pump chamber with an opening in the upper end, a resettable pump head body is installed in the pump chamber, a base cover used for being installed on a bottle opening is installed at the upper end of the pump chamber, a first protruding ring is arranged on the inner wall of the base cover, and the first protruding ring abuts against the outer wall of the pump head body. The installation gap between the base cover and the pump head is sealed, the pump head is pressed, air in the pump chamber enters the bottle through the air inlet hole, liquid in the bottle is discharged through the liquid outlet pipe and the pump head, the pump head is loosened, external air enters the pump chamber through the air supply channel, circulation is formed, an additional piston structure is not needed, and on the basis that normal liquid outlet is guaranteed, the working efficiency is improved. The structure is optimized, the production and assembly process is simplified, manufacturing is easier, the piston structure does not need to be damaged in the installation process, and the situation that the sealing effect of the piston structure becomes poor after repeated use, air leakage occurs, and consequently the product function is unstable is avoided.

The utility model relates to a vacuum bottle with a pressing type telescopic pump head, which aims at solving the technical problems that a core head of the existing similar product is difficult to retract and hide after being pressed, sanitation and cleanness of an orifice are difficult to guarantee, and the shape maintenance and the production stability are poor when emulsion is discharged. The telescopic pump head vacuum bottle comprises an inner pipe, an outer pipe, a pressing cap, a piston, a pump core assembly and a liquid outlet nozzle assembly. The liquid outlet nozzle assembly is characterized in that a lower shoulder sleeve at one end of a pipe sleeve of the liquid outlet nozzle assembly is buckled and fixed to the outer pipe, one end of a liquid outlet hole in the pipe sleeve is sleeved with a valve rod extending out of the pump core assembly, the other end of the liquid outlet hole protrudes and is sleeved with a dropper head, and a liquid dropping core buckled and fixed in the liquid outlet hole is arranged at the sleeving position of the dropper head and the liquid outlet hole of the pipe sleeve. The head of the dropping core is inserted into the inner diameter of a dropping hole of the dropper head, the outer diameter of the dropping hole of the dropper head is sleeved with a head cap hole in one end of the head cap, a dropper head spring is arranged on the outer diameter of the dropper head in the head cap, and a transition cavity for pressing the dropping core to stretch out, retract and hide is arranged between the outer diameter of the head of the dropping core in the dropper head and the inner wall of the dropping head.

The invention provides a paraffin phase change driving-based deep sea single-action piston pump. The paraffin phase change driving-based deep sea single-action piston pump comprises a driving module, a piston module and a pump body module, the driving module comprises a heating rod, a ceramic end cover, a foamy copper-paraffin phase change unit and a silica gel shell; the piston module comprises a small piston and a large piston at two ends of the threaded rod; the pump body module comprises a top end cover, a small cylinder barrel, an upper connecting cover, a large cylinder barrel and a lower connecting cover; the driving module and the small piston are located in a through hole in the center of the small cylinder barrel. The large piston is located in a through hole in the center of the large cylinder barrel, and a reset spring is installed between the large piston and the lower connecting cover. A pressure balance hole is formed in the upper connecting cover; the lower connecting cover is provided with a groove, the two sides of the lower connecting cover are each provided with a threaded hole, and each threaded hole is provided with a thin film one-way valve. The piston pump generates volume increment through paraffin phase change to provide linear output, and the requirement for a small hydraulic power source of the deep-sea robot can be met.

An industrial apparatus comprising: - a circuit (2) in which a operating fluid circulates; said circuit (2) comprising a means (20) for heating the operating fluid and being deprived of evaporator, - a circulating line (31) in which a heat transfer fluid circulates; the circulating line (31) being closed on itself; the flow rate of the heat transfer fluid in said circulating line (31) being comprised between 10 and 500 m3 / h, - a first heat exchanger (901); the first heat exchanger (901) placing said circuit (2) and said circulating line (31) in thermal communication, - an industrial heater (92) comprising a second heat exchanger (902) in which the circulating line (31) passes, characterised in that the heating means (20) consists of a piston pump (21).

Apparatus and associated methods relate to using an electro-hydraulic solenoid valve to provide regulation of fluid displacement of a variable-displacement hydraulic pump. A mechanical control mechanism is configured to control displacement of hydraulic fluid pumped from a hydraulic input port to a hydraulic output port. The electro-hydraulic solenoid valve regulates fluid conductivity between a hydraulic output port of the variable-displacement hydraulic pump and a hydraulic control cylinder, which operates a hydraulic control piston coupled to the mechanical control mechanism controlling fluid displacement. An electronic control unit is configured to generate and transmit an electrical control signal to the electro-hydraulic solenoid valve in response to a metric of the variable-displacement hydraulic pump as measured by a transducer. The electronic control unit generates the electrical control signal so as to control the metric measured to within a predetermined control band about a target value.

The invention discloses a quick response reversing assembly applied to a portable air inflation device, relates to the technical field of air inflation devices, and aims at improving a ventilation pipe in the air exhaust action on the basis of the air suction / exhaust action of a piston pump, namely changing the communicating / blocking state in the ventilation pipe through the rotating action of a ventilation rotating ball on the basis of the ventilation rotating ball. On the basis, an improvement scheme about a single-pass ring pipe and a two-pass ring pipe is provided, arc-shaped sliding blocks are arranged in the two-pass ring pipe, when the ventilation rotating ball is switched to block the ventilation pipe, the first arc-shaped sliding block in the single-pass ring pipe accelerates the ventilation rotating ball to recover the blocking action with the high pressure difference as power, and the second arc-shaped sliding block in the two-pass ring pipe accelerates the ventilation rotating ball to block the ventilation pipe. Furthermore, the influence process on the environmental pressure in the dynamic bin when the arc-shaped sliding block I slides is utilized, and a rubber leather sheath arranged in the air vent is utilized to further accelerate plugging, so that the situation that the inflation efficiency is reduced due to high pressure difference is avoided in a high-reaction-capacity action mode; and secondly, the purpose of indirectly controlling the inflation / deflation action is achieved through the two-way ring pipe.

The utility model relates to an automatic turnover device of a black tea fermentation machine, which belongs to the technical field of black tea production and processing and comprises a support frame, a processing cylinder fixedly mounted on the top side of the support frame and a fermentation cylinder fixedly mounted in the processing cylinder, and a turnover mechanism and a watering mechanism are arranged outside the processing cylinder; the turnover mechanism comprises a rotating rod which is rotationally mounted on one side of the processing cylinder and extends into the fermentation cylinder, a stirring plate fixedly welded to the outer surface of the rotating rod, and a driving motor fixedly mounted on the outer wall of one side of the processing cylinder; a plurality of water spraying holes which are formed at equal intervals are formed in the rotating rod; a linkage structure is arranged between the driven gear and the piston pump. According to the automatic turnover device of the black tea fermentation machine, the rotating rod rotates to drive the stirring plate to continuously stir tea leaves in the turnover process, so that the tea leaves are in more sufficient contact with air and fermentation conditions, water can be uniformly sprayed on the tea leaves due to the design of the water spraying holes, and mixing and fermentation of the tea leaves are further promoted.

The present invention relates to a method for coating a lumen of a tube using fluid displacement techniques. A coating solution is introduced into the lumen by positive or negative displacement, excess solution is removed to form a thin film, and the film is subsequently cured. The displacement system may include a piston pump, a peristaltic pump, or a syringe. The method may further allow for multiple coating layers, coating of both inner and outer surfaces, and simultaneous coating of multiple tubes using a manifold.

1. The name of the design product: three-cylinder piston pump. 2. The use of the design product: the pump is used for intermittent oil well operation, such as acidification, well cementing, fracturing, well killing, gravel packing and the like. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The present disclosure relates to a piston assembly, a lower cylinder block structure, and a pneumatic piston pump. The piston assembly includes a hollow piston column, an upper locking member sleeved outside the piston column, a lower locking member, and a blocking member and a first sealing ring fixed between the upper locking member and the lower locking member; wherein, the blocking member is provided with a ring-shaped first installation groove with an opening facing the outer peripheral side, and the first sealing ring is arranged in the first installation groove; a ring-shaped second installation groove is formed on the outer peripheral side of at least one of the upper locking member and the lower locking member, and a second sealing ring is arranged in the second installation groove; the material stiffness of the blocking member is greater than that of the first sealing ring. The arrangement of the first sealing ring and the second sealing ring of the piston assembly is beneficial to improving the sealing between the piston assembly and the structure on its outer peripheral side, thereby reducing the entry of materials into the outer peripheral side of the piston assembly, reducing the wear of the piston assembly during use, and being beneficial to improving the service life of the piston.

The present invention relates to a pneumatically driven piston pump and its quick exhaust slide valves, which allows air to be evacuated from the piston pump's piston chambers directly into the environment without having to pass through the main distributor valve, in such a way that it does not cause a drop in temperature due to the expansion of the compressed air which freezes the humidity of the air itself, clogging the compressed air circulation ducts and causing the pump to shut down or stall. Such an air-operated piston pump with quick exhaust valves allows the passage of air with low restriction, which increases the efficiency of the piston pump and decreases its compressed air consumption compared to the same air motor without quick exhaust valves.

This application relates to the field of rotary piston pump technology, specifically to a rotary piston pump volume adjustment device, a piston pump, and a piston pump injection system. The volume adjustment device includes a frame, a fixed sleeve, a rotating shaft base, and a drive assembly. The fixed sleeve has a connecting structure for engaging with the rotary piston pump head. The rotating shaft base is mounted in a sliding groove on the fixed sleeve. The drive assembly drives the rotating shaft base to reciprocate. In this application, the drive assembly drives the rotating shaft base to reciprocate, causing the fixed sleeve and the pump head on the fixed sleeve to swing back and forth relative to the frame and pump body, thereby changing the tilt angle of the pump head relative to the pump body. This precise mechanical transmission method can accurately control the swing angle of the pump head, thus achieving precise adjustment of the rotary piston pump volume.