CN221547250U - Pressure stagnation pump - Google Patents

Abstract

The utility model discloses a stagnation pressure pump, wherein a stagnation pressure water inlet mechanism is directly and integrally arranged at a water inlet pipe of a liquid pump body and is communicated with a liquid suction cavity of the liquid pump body, a negative pressure ejector pin in a thrust diaphragm jacks up a rubber head to leave from a water inlet communicated with a water inlet, the upper end of the rubber head is opposite to a water inlet channel of a valve body mounting seat, when the water inlet pressure is overlarge, the water pressure in the water inlet pipe can directly act on the rubber head to form a thrust diaphragm jack up reverse pressure, and the rubber head is pressed by the rubber head under different water inlet pressures to adjust the size of a released channel communicated with the water inlet, so that the inflow speed of the water inlet pipe and the pressure in the liquid pump body are correspondingly and passively adjusted, and the forward leakage prevention and the risk of damaging parts in the liquid pump by large pressure can be simultaneously achieved; and the integrated design can be suitable for multiple pump bodies, has simple structure, does not need an external valve body, and has low use and installation cost.

Description

Pressure stagnation pump

Technical Field

The utility model relates to the technical field of pump equipment, in particular to a pressure-retaining pump.

Background

The existing liquid pump in the market is still in a communication state when the pump does not work, when the liquid level of the liquid inlet exceeds the liquid outlet of the pump or the pressure is higher than the liquid outlet, along with the fact that the larger the drop pressure difference between the liquid level of the liquid inlet and the liquid outlet end is, the liquid flows out from the outlet of the motor pump due to gravity or pressure, the larger the vertical distance of the press is, the larger the probability that the liquid flows out from the outlet is, and the larger the probability that the liquid flows out from the outlet is, when an electric appliance is not in a use state, the liquid leaks into the electric appliance or out of the electric appliance due to the fact that the liquid exists in the liquid storage tank in the electric appliance, so that the liquid inlet of a storage area and related equipment is stored, and potential safety hazards can be brought.

In order to solve the problem, as shown in patent publication No. CN114526368A, a negative pressure valve is additionally arranged at the water inlet end of the water inlet, and the principle of the negative pressure valve is to utilize the air in a pipe from the water inlet pipe to the negative pressure valve section when the liquid pump works, the air pressure diaphragm jacks up the rubber head on the channel communicated with the external liquid, and the rubber head is put into the liquid to enter the water inlet pipe of the liquid pump, so that the water inlet pressure when the pump does not work can be well blocked, and the problem of water leakage is prevented. However, when a negative pressure valve is added, the use and installation cost of a user can be increased, the existing negative pressure valve in the market has a problem that a movable cavity is independently designed on a rubber head and a spring in the negative pressure valve, the liquid inlet direction of a valve body is perpendicular to the movable cavity and the rubber head, liquid inlet basically directly enters a liquid pump from a channel below the rubber body, so that when the liquid pump works, external liquid pressure cannot act on the rubber head and the pressure and the speed of the liquid inlet cannot be adjusted passively, when the external liquid pressure is overlarge, the pressure impact on a part moving in a core conveying scale in the pump is larger, the part is more easily damaged and loses efficacy due to the movement, once the part is damaged, the scale with the pressure can overflow the water pump rapidly, the pressure of the liquid inlet is too large to affect the normal work of the pump to reach the preset performance of the pump due to too much liquid inlet, and the risk that the part is damaged by the large pressure impact is generated. Because the pump is installed in the electrical apparatus at most, when the pump leads to inside core part damage because of import pressure, the meson can leak outside the pump and reach in the electrical apparatus and outside the electrical apparatus to take place to store and place district and associated equipment and advance liquid, bring the potential safety hazard. Therefore, a further design is needed, and the risks that the pump body is damaged by overlarge inlet liquid pressure and overlarge flow speed and pressure impact when the liquid pump works are solved while the pressure difference water leakage caused by overlarge inlet pressure when the liquid pump does not work is solved.

Disclosure of utility model

The utility model aims to overcome the defects, and provides a stagnation pressure pump, wherein a stagnation pressure water inlet mechanism is designed on a pump body water inlet pipe so as to solve the technical problems that in the prior art, the pressure of inlet liquid cannot be adjusted to be too large, the flow rate is too large and the like when a liquid pump works.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a stagnation pressure pump which comprises a liquid pump body and a stagnation pressure water inlet mechanism arranged at a water inlet pipe of the liquid pump body, wherein the water inlet end of the stagnation pressure water inlet mechanism is communicated with the water inlet pipe of the liquid pump body, and the water outlet end of the stagnation pressure water inlet mechanism is communicated with a liquid suction cavity of the liquid pump body.

The pressure-retaining water inlet mechanism comprises a valve body mounting seat, a valve body, a spring, a rubber head, a mounting plate, a thimble, a thrust diaphragm and a rear cover, wherein the valve body mounting seat is fixed on the side surface of a water inlet pipe of the liquid pump body, a central water inlet channel is communicated with the bottom of the water inlet pipe, the middle part of the valve body is divided into a water inlet cavity and a water outlet cavity by a concave-convex plate, the rear cover abuts against the edge of the thrust diaphragm and then abuts against the edge of the water outlet cavity of the valve body to seal the water outlet cavity, and the lower part of the water outlet cavity is communicated with a liquid suction cavity of the liquid pump body;

The rear cover is propped against the thrust diaphragm and then against the valve body, and the edge of the water inlet cavity of the valve body presses the valve body mounting seat to be communicated and fixed with the water inlet channel in a sealing way;

A communication water inlet is formed in the center of the water inlet cavity and the water outlet cavity of the valve body, and a movable rubber head with the lower end blocking the communication water inlet is arranged at the communication water inlet; one end of the spring props against the upper end of the rubber head to block the communicated water inlet, and the other end props against the outer side edge of the water inlet channel of the valve body mounting seat; the upper end of the rubber head is opposite to the water inlet channel of the valve body mounting seat;

The bottom of the mounting plate is fixed at the center of the thrust diaphragm towards the water outlet cavity side, the thimble is fixed at the center of the upper part of the mounting plate, the center of the water inlet end communicated with the rubber head is plugged with a thimble embedded groove, and the thimble is correspondingly embedded in the thimble embedded groove.

Further, a sealing ring is arranged between the valve body and the valve body mounting seat, and the edge of the water inlet cavity of the valve body presses the sealing ring and then props against the valve body mounting seat to be communicated with the water inlet channel in a sealing manner.

Further, the rear cover is provided with air holes, and the air holes are communicated with an outer air chamber formed after the rear cover abuts against the edge of the thrust diaphragm, so that the outer air chamber at the outer side of the thrust diaphragm is communicated with the outside air.

Further, the liquid pump body is a motor diaphragm pump.

The motor diaphragm pump comprises a base, a motor fixed on the lower side of the base, a crank transmission mechanism connected with the motor in a power mode, an umbrella membrane pumping mechanism fixed on the upper side of the base, and a liquid inlet and outlet upper cover fixedly sleeved on the upper side of the umbrella membrane pumping mechanism in a sealing mode, wherein a water inlet pipe and a water outlet pipe are arranged on the upper side of the liquid inlet and outlet upper cover; the middle part of the lower side of the upper cover of the liquid inlet and outlet is provided with an annular wall, and the space of the lower side of the upper cover of the liquid inlet and outlet is divided into a liquid suction cavity at the periphery of the annular wall and a liquid pumping cavity at the inner side of the annular wall; the water inlet pipe is communicated with the liquid suction cavity, and the water outlet pipe is communicated with the liquid pump cavity;

The crank transmission mechanism is in power connection with the umbrella membrane pumping mechanism to provide pumping pressure power, the umbrella membrane pumping mechanism is communicated with the liquid suction cavity through the outer side channel seal, and the central channel seal is communicated with the liquid suction cavity.

Further, the crank transmission mechanism comprises a crank, a shaft and a connecting rod, wherein the crank is fixed on a motor power shaft to realize power connection, the connecting rod is fixedly connected with the crank through the shaft, the connecting rod is of a three-blade sheet structure, the blades are provided with connecting holes and are opposite to the umbrella membrane pumping mechanism, and the connecting rod blades are in power connection with the umbrella membrane pumping mechanism to provide power.

The umbrella membrane pumping mechanism comprises a membrane, a membrane support, a small umbrella-shaped valve, a valve support, a large umbrella-shaped valve, an outer ring sealing ring and an inner ring sealing ring, wherein the membrane is of a structure with three supporting feet corresponding to three membrane chambers, the three supporting feet of the membrane are in power connection with a crank transmission mechanism, the membrane support presses the membrane to be fixed on the upper side surface of a base, the valve support is fixed on the upper side surface of the membrane support, three outer ring channels which are correspondingly communicated with a liquid suction cavity of an upper cover of an inlet liquid are arranged on the periphery of the valve support, and the small umbrella-shaped valve is provided with three outer ring channels which are movably arranged in the valve support and seal the three outer ring channels;

The center of the valve support is provided with a central channel which is correspondingly communicated with the pump liquid cavity of the upper cover of the inlet and outlet liquid, the large umbrella-shaped valve is movably arranged in the middle of the valve support, the lower side of the valve support seals the central channel of the valve support, the upper side surface of the valve support clamps the outer ring sealing ring to prop against the lower side outer ring sealing liquid suction cavity of the upper cover of the inlet and outlet liquid, and the edge of the central channel of the upper side surface of the valve support clamps the inner ring sealing ring to prop against the lower side annular wall sealing pump liquid cavity of the upper cover of the inlet and outlet liquid.

Compared with the prior art, the utility model has the beneficial effects that: the water inlet pipe of the liquid pump body is directly and integrally provided with a stagnation pressure water inlet mechanism which is communicated with the liquid suction cavity of the liquid pump body, the rubber head is jacked up by the negative pressure thimble in the thrust diaphragm to leave from the water inlet of the communicated water inlet, the upper end of the rubber head is opposite to the water inlet channel of the valve body mounting seat, when the water inlet pressure is overlarge, the water pressure in the water inlet pipe can directly act on the rubber head, the reverse pressure is jacked by forming a thrust diaphragm, and the pressure rubber heads are pressed by the passive root with different inlet liquid pressures to adjust the size of a released channel communicated with the water inlet, so that the inflow speed of the inlet pipe and the pressure in the liquid pump body are correspondingly and passively adjusted, and the risks of forward leakage prevention and high pressure damage to parts in the liquid pump can be simultaneously achieved; and the integrated design can be suitable for multiple pump bodies, has simple structure, does not need an external valve body, and has low use and installation cost.

Drawings

FIG. 1 is a schematic axial cross-sectional view of a stagnation pump according to an embodiment of the present utility model;

Fig. 2 is a schematic diagram illustrating disassembly of a stagnation pump according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a valve carriage according to an embodiment of the present utility model;

FIG. 4 is a schematic view of an upper cover for an inlet and outlet according to an embodiment of the present utility model.

The reference numerals are explained as follows:

1 is a liquid pump body, 2 is a hysteresis pressure water inlet mechanism, 101 is a water inlet pipe, 102 is a liquid suction cavity, 201 is a valve body mounting seat, 202 is a valve body, 203 is a spring, 204 is a rubber head, 205 is a mounting plate, 206 is a thimble, 207 is a thrust diaphragm, 208 is a rear cover, 209 is a water inlet channel, 210 is a concave-convex plate, 211 is a water inlet cavity, 212 is a water outlet cavity, 213 is a communication water inlet, 214 is a thimble embedded groove, 215 is a sealing ring, 216 is an air hole, 217 is an outer air chamber, 103 is a base, 104 is a motor, 105 is a crank transmission mechanism, 106 is an umbrella membrane pumping mechanism, 107 is an inlet and outlet upper cover, 108 is a water outlet pipe, 109 is an annular wall, 110 is a pump liquid cavity, 111 is a crank, 112 is a shaft, 113 is a connecting rod, 114 is a diaphragm, 115 is a diaphragm support, 116 is a small umbrella valve support, 118 is a big umbrella valve, 119 is an outer ring sealing ring, 120 is an outer ring sealing ring, 121 is an outer ring channel, 122 is a central channel.

Detailed Description

The utility model is further elucidated below in connection with the accompanying drawings.

Referring to fig. 1 and 2, an embodiment of the present utility model is a pressure-retaining pump, which includes a liquid pump body 1, and importantly, a pressure-retaining water inlet mechanism 2 disposed at a water inlet pipe 101 of the liquid pump body 1, wherein a water inlet end of the pressure-retaining water inlet mechanism 2 is communicated with the water inlet pipe of the liquid pump body 1, and a water outlet end of the pressure-retaining water inlet mechanism 2 is communicated with a liquid suction cavity 102 of the liquid pump body 1.

Preferably, the stagnation pressure water inlet mechanism 2 comprises a valve body mounting seat 201, a valve body 202, a spring 203, a rubber head 204, a mounting plate 205, a thimble 206, a thrust diaphragm 207 and a rear cover 208, wherein the valve body mounting seat 201 is fixed on the side surface of a water inlet pipe 101 of the liquid pump body 1, a central water inlet channel 209 is communicated with the bottom of the water inlet pipe 101, the middle part of the valve body 202 is divided into a water inlet cavity 211 and a water outlet cavity 212 by a concave-convex plate 210, the rear cover 208 abuts against the edge of the thrust diaphragm 207 and then abuts against the edge of the water outlet cavity 212 of the valve body 202 to seal the water outlet cavity 212, and the lower part of the water outlet cavity 212 is communicated with the liquid suction cavity 102 of the liquid pump body 1;

after the rear cover 208 is propped against the thrust diaphragm 207 and then against the valve body 202, the edge of the water inlet cavity 211 of the valve body 202 presses the valve body mounting seat 201 to be communicated and fixed with the water inlet channel 209 in a sealing way;

A communication water inlet 213 is arranged in the center of the water inlet cavity 211 and the water outlet cavity 212 of the valve body 202, and a movable rubber head 204 with the lower end blocking the communication water inlet 213 is arranged at the communication water inlet 213; one end of the spring 203 is propped against the upper end of the rubber head 204 to block the communicated water inlet 213, the other end is propped against the outer side edge of the water inlet channel 209 of the valve body mounting seat 201, and the spring 203 provides thrust to block the communicated water inlet 213;

The upper end of the rubber head 204 is right opposite to the water inlet channel 209 of the valve body mounting seat 201, and the water pressure of the inlet pressure can directly act on the rubber head 204 to form a pushing force for pressing the rubber head 204, and the magnitude of the pushing force is related to the following hydraulic pressure;

The bottom of the mounting plate 205 is fixed at the center of the thrust diaphragm 207 facing the water outlet cavity 212 side, the thimble 206 is fixed at the center of the upper part of the mounting plate 205, the center of the end, which is communicated with the water inlet 213, of the rubber head 204 is blocked, a thimble embedded groove 214 is arranged, the thimble 206 is correspondingly embedded in the thimble embedded groove 214, and the rubber head 204 can be prevented from being shifted or no straight line acts on the rubber head 204 during jacking;

When the liquid pump does not work, the spring 203 presses the main rubber head 204 to block the communicated water inlet 213, so that liquid in the water inlet pipe 101 cannot enter the liquid pump, and the problem of pressure difference water leakage can be effectively prevented;

When the liquid pump works, the liquid pump body 1 evacuates the liquid suction cavity 102 and the airtight water outlet cavity 212 of the thrust diaphragm 207, the thrust diaphragm 207 contracts to drive the ejector pin 206 to push the rubber head 204 upwards, and the water inlet 213 is communicated with the liquid inlet pipe 101 for liquid feeding; when the pressure of the inlet pipe 101 is overlarge, the pressure of the inlet hydraulic acts on the upper end of the rubber head 204 directly to form downward pressure, the pressure is increased along with the larger pressure of the inlet hydraulic, and the rubber head 204 is pressed down by different pressure of the inlet hydraulic to adjust the size of a released channel communicated with the water inlet 213, so that the inflow speed of the inlet pipe 101 and the pressure in the body of the liquid pump are correspondingly and passively adjusted;

In such design, the pressure-retarding water inlet mechanism 2 is directly and integrally arranged at the water inlet pipe 101 of the liquid pump body 1 and is communicated with the liquid suction cavity 102 of the liquid pump body 1, the negative pressure ejector pin 206 in the thrust diaphragm 207 jacks up the rubber head 204 to leave from the liquid inlet 213 for liquid inlet, the upper end of the rubber head 204 is aligned to the water inlet channel 209 of the valve body mounting seat 201, when the pressure of the water inlet is overlarge, the water pressure in the water inlet pipe 101 can directly act on the rubber head 204 to form a thrust diaphragm 207 jack up the reverse pressure, the rubber head 204 is pressed by the passive root with different pressure of the water inlet to adjust the size of the released channel communicated with the water inlet 213, so that the inflow speed of the water inlet pipe 101 and the pressure in the liquid pump body 1 are correspondingly and passively adjusted, and the risks of forward leakage prevention and damage to parts in the liquid pump due to large pressure can be simultaneously achieved; and the integrated design can be suitable for multiple pump bodies, has simple structure, does not need an external valve body, and has low use and installation cost.

Preferably, a sealing ring 215 is further arranged between the valve body 202 and the valve body mounting seat 201, and the edge of the water inlet cavity 211 of the valve body 202 presses the sealing ring 215 and then props against the valve body mounting seat 201 to be communicated with the water inlet channel 209 in a sealing way for sealing connection so as to prevent water leakage.

Preferably, the rear cover 208 is provided with an air hole 216, and the air hole 216 is communicated with an outer air chamber 217 formed after the rear cover 208 abuts against the edge of the thrust diaphragm 207, so that the outer air chamber 217 outside the thrust diaphragm 207 is communicated with the outside air, and the thrust diaphragm 207 is convenient to move.

The liquid pump body 1 is preferably a motor diaphragm pump, and of course, other liquid pumps may be used, and the stagnation pressure water intake mechanism 2 of the present patent design may be applied as long as the liquid pump is a liquid pump that uses suction to take liquid from a water intake pipe.

Referring to fig. 2, 3 and 4, more specifically, the motor diaphragm pump includes a base 103, a motor 104 fixed on the lower side of the base 103, a crank transmission mechanism 105 in power connection with the motor 104, an umbrella membrane pumping mechanism 106 fixed on the upper side of the base 103, an inlet and outlet upper cover 107 hermetically and fixedly sleeved on the upper side of the umbrella membrane pumping mechanism 106, and an inlet pipe 101 and an outlet pipe 108 are arranged on the upper side of the inlet and outlet upper cover 107; the middle part of the lower side of the upper inlet and outlet cover 107 is provided with an annular wall 109, and the space of the lower side of the upper inlet and outlet cover 107 is divided into a liquid suction cavity 102 at the periphery of the annular wall 109 and a liquid pumping cavity 110 at the inner side of the annular wall 109; the water inlet pipe 101 is communicated with the liquid suction cavity 102, and the water outlet pipe 108 is communicated with the liquid pumping cavity 110;

The crank drive 105 is in power connection with the umbrella membrane pumping mechanism 106 to provide pumping pressure power, the umbrella membrane pumping mechanism 106 communicates with the liquid suction chamber 102 through an outside channel seal, and the center channel seal communicates with the liquid pumping chamber 110.

More specifically, the crank transmission mechanism 105 comprises a crank 111, a shaft 112 and a connecting rod 113, the crank 111 is fixed on a power shaft of the motor 104 to realize power connection, the connecting rod 113 is fixedly connected with the crank 111 through the shaft 112, the connecting rod 113 is of a three-blade sheet structure, the blades are provided with connecting holes and are opposite to the umbrella membrane pumping mechanism 106, and the blades of the connecting rod 113 are in power connection with the umbrella membrane pumping mechanism 106 to provide power.

More specifically, the umbrella membrane pumping mechanism 106 includes a membrane 114, a membrane support 115, a small umbrella valve 116, a valve support 117, a large umbrella valve 118, an outer ring sealing ring 119, and an inner ring sealing ring 120, wherein the membrane 114 has a structure with three legs corresponding to three membrane chambers, the three legs of the membrane 114 are in power connection with the crank transmission mechanism 105, the membrane support 115 presses the membrane 114 to be fixed on the upper side surface of the base 103, the valve support 117 is fixed on the upper side surface of the membrane support 115, three outer ring channels 121 which are correspondingly communicated with the liquid suction cavity 102 of the liquid inlet and outlet upper cover 107 are arranged on the periphery of the valve support 117, and the small umbrella valve 116 has three outer ring channels 121 which are movably arranged in the valve support 117 and seal the three outer ring channels 121; when the diaphragm 114 is drawn downward, the small umbrella valve 116 opens to communicate with the aspiration lumen 102; when the diaphragm 114 is pressed upward, the small umbrella valve 116 closes the outer ring passage 121, and the pressure cannot enter the liquid suction chamber 102;

The center of the valve bracket 117 is provided with a central channel 122 which is correspondingly communicated with the pump liquid cavity 110 of the upper inlet and outlet cover 107, the large umbrella-shaped valve 118 is movably arranged in the middle of the valve bracket 117 and the lower side of the large umbrella-shaped valve seals the central channel 122 of the valve bracket 117, the upper side surface of the valve bracket 117 clamps the outer ring sealing ring 119 to prop against the lower side outer ring sealing liquid suction cavity 102 of the upper inlet and outlet cover 107, and the edge of the central channel 122 of the upper side surface of the valve bracket 117 clamps the inner ring sealing ring 120 to prop against the lower side annular wall 109 of the upper inlet and outlet cover 107 to seal the pump liquid cavity 110; when the diaphragm 114 is pressed upward, the small umbrella valve 116 closes the outer ring channel 121, and pressure cannot enter the liquid suction cavity 102, and at this time, the pressure pushes up the large umbrella valve 118 through the central channel 122 to enter the liquid pumping cavity 110 and then is pumped out from the water outlet pipe.

In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., indicate that the particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the utility model, as generally described. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the utility model.

Although the utility model has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, drawings and claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will be apparent to those skilled in the art.

Claims (8)

1. The utility model provides a hysteresis pump, includes liquid pump body, its characterized in that: still including setting up the stagnant pressure water inlet mechanism in liquid pump body inlet tube department, stagnant pressure water inlet mechanism water inlet end and liquid pump body inlet tube intercommunication, stagnant pressure water inlet mechanism water outlet end and liquid pump body imbibition chamber intercommunication.

2. The stagnation pressure pump according to claim 1, wherein: the stagnation pressure water inlet mechanism comprises a valve body mounting seat, a valve body, a spring, a rubber head, a mounting plate, a thimble, a thrust diaphragm and a rear cover, wherein the valve body mounting seat is fixed on the side surface of a water inlet pipe of the liquid pump body, a central water inlet channel is communicated with the bottom of the water inlet pipe, the middle part of the valve body is divided into a water inlet cavity and a water outlet cavity through a concave-convex plate, the rear cover abuts against the edge of the thrust diaphragm and then abuts against the edge of the water outlet cavity of the valve body to seal the water outlet cavity, and the lower part of the water outlet cavity is communicated with the liquid suction cavity of the liquid pump body;

The rear cover is propped against the thrust diaphragm and then against the valve body, and the edge of the water inlet cavity of the valve body presses the valve body mounting seat to be communicated and fixed with the water inlet channel in a sealing way;

A communication water inlet is formed in the center of the water inlet cavity and the water outlet cavity of the valve body, and a movable rubber head with the lower end blocking the communication water inlet is arranged at the communication water inlet; one end of the spring props against the upper end of the rubber head to block the communicated water inlet, and the other end props against the outer side edge of the water inlet channel of the valve body mounting seat; the upper end of the rubber head is opposite to the water inlet channel of the valve body mounting seat;

The bottom of the mounting plate is fixed at the center of the thrust diaphragm towards the water outlet cavity side, the thimble is fixed at the center of the upper part of the mounting plate, the center of the water inlet end communicated with the rubber head is plugged with a thimble embedded groove, and the thimble is correspondingly embedded in the thimble embedded groove.

3. The stagnation pressure pump according to claim 2, wherein: a sealing ring is further arranged between the valve body and the valve body mounting seat, and the edge of the water inlet cavity of the valve body presses the sealing ring and then props against the valve body mounting seat to be communicated with the water inlet channel in a sealing manner.

4. The stagnation pressure pump according to claim 2, wherein: the rear cover is provided with air holes, and the air holes are communicated with an outer air chamber formed after the rear cover abuts against the edge of the thrust diaphragm, so that the outer air chamber at the outer side of the thrust diaphragm is communicated with outside air.

5. The stagnation pressure pump according to claim 1, wherein: the liquid pump body is a motor diaphragm pump.

6. The stagnation pump of claim 5 wherein: the motor diaphragm pump comprises a base, a motor fixed on the lower side of the base, a crank transmission mechanism connected with the motor in a power mode, an umbrella membrane pumping mechanism fixed on the upper side of the base, and a liquid inlet and outlet upper cover fixedly sleeved on the upper side of the umbrella membrane pumping mechanism in a sealing mode, wherein a water inlet pipe and a water outlet pipe are arranged on the upper side of the liquid inlet and outlet upper cover; the middle part of the lower side of the upper cover of the liquid inlet and outlet is provided with an annular wall, and the space of the lower side of the upper cover of the liquid inlet and outlet is divided into a liquid suction cavity at the periphery of the annular wall and a liquid pumping cavity at the inner side of the annular wall; the water inlet pipe is communicated with the liquid suction cavity, and the water outlet pipe is communicated with the liquid pump cavity;

The crank transmission mechanism is in power connection with the umbrella membrane pumping mechanism to provide pumping pressure power, the umbrella membrane pumping mechanism is communicated with the liquid suction cavity through the outer side channel seal, and the central channel seal is communicated with the liquid suction cavity.

7. The stagnation pump of claim 6 wherein: the crank transmission mechanism comprises a crank, a shaft and a connecting rod, wherein the crank is fixed on a motor power shaft to realize power connection, the connecting rod is fixedly connected with the crank through the shaft, the connecting rod is of a three-blade sheet structure, the blades are provided with connecting holes and are opposite to the umbrella membrane pumping mechanism, and the connecting rod blades are in power connection with the umbrella membrane pumping mechanism to provide power.

8. The stagnation pump of claim 6 wherein: the umbrella membrane pumping mechanism comprises a membrane, a membrane support, a small umbrella valve, a valve support, a large umbrella valve, an outer ring sealing ring and an inner ring sealing ring, wherein the membrane is of a structure with three supporting legs corresponding to three membrane chambers, the three supporting legs of the membrane are in power connection with a crank transmission mechanism, the membrane support presses the membrane to be fixed on the upper side surface of a base, the valve support is fixed on the upper side surface of the membrane support, three outer ring channels which are correspondingly communicated with a liquid suction cavity of an upper cover of a liquid inlet and outlet are arranged on the periphery of the valve support, and the small umbrella valve is provided with three outer ring channels which are movably arranged in the three outer ring channels of the valve support and seal the three outer ring channels;

The center of the valve support is provided with a central channel which is correspondingly communicated with the pump liquid cavity of the upper cover of the inlet and outlet liquid, the large umbrella-shaped valve is movably arranged in the middle of the valve support, the lower side of the valve support seals the central channel of the valve support, the upper side surface of the valve support clamps the outer ring sealing ring to prop against the lower side outer ring sealing liquid suction cavity of the upper cover of the inlet and outlet liquid, and the edge of the central channel of the upper side surface of the valve support clamps the inner ring sealing ring to prop against the lower side annular wall sealing pump liquid cavity of the upper cover of the inlet and outlet liquid.