Water pump with negative pressure valve

Abstract

The utility model relates to the field of fluid conveying, in particular to a water pump with a negative pressure valve, the structure of the negative pressure valve is integrated on the water pump structure, due to the integrated structure, pipeline connection is more convenient, the structure is simpler, and the negative pressure valve structure comprises a membrane, a sealing head and a pushing assembly. The diaphragm is circumferentially fixed between the shell and the upper cover, a cavity formed between the shell and the upper cover is divided into a negative pressure cavity and an atmosphere cavity, the shell is provided with a first through hole and a second through hole, the first through hole is communicated with the negative pressure cavity and the water inlet cavity, the pressurizing bin is provided with a third through hole, and the second through hole and the third through hole are matched to form a first overflowing channel; the sealing head is arranged in the water inlet cavity and provided with an elastic piece which acts on the sealing head to enable the sealing head to block the first through hole, the pushing assembly is arranged between the diaphragm and the sealing head, when the sealing head is in a static state, good pressure bearing and sealing effects can be achieved, the sealing head can work in a normally-open and stable water flow mode in the working process, and stable and low-noise work and operation of the pump body are achieved.

Description

Technical Field

[0001] The utility model relates to the field of fluid transportation, and particularly relates to a water pump with a negative pressure valve. Background Art

[0002] There are currently two structural designs for water dispensers on the market: with a water tank and without a water tank. Products with a water tank have a larger space, and the water tank plays a role in storing water. However, when not working for a long time, there is a hidden danger of bacterial contamination. The drinking water industry has invested in research and development to solve this hidden danger of the water tank. Thus, a design without a water tank has emerged. The structure without a water tank not only solves the hidden danger of bacterial contamination in water storage but also occupies less space for the product, optimizing the overall structural space design of the machine. In existing water dispensers without a water tank, a negative pressure valve or a zero pressure valve is provided at the front end of the water inlet for water inlet pressure bearing. The negative pressure valve is connected to a water pump at the rear end. When the water pump works, the negative pressure valve opens, and the water pump makes the water flow normally, and the water output is controlled. For example, patent CN213088793U discloses a pipeline control system, including a negative pressure valve, a diaphragm pump, a heating unit, and a water outlet valve connected in sequence. However, this structure is complex and has a high cost, resulting in limited product design and development and unable to meet market competition. In addition, the structure of the negative pressure valve disclosed in patent CN213088793U includes a valve body and a valve seat that are hermetically connected to each other. The valve seat is provided with a water inlet, the valve body is provided with a water outlet, and a flow control component is provided on the water path connecting the water inlet and the water outlet. The flow control component includes a return spring, a control rod, a pressure-sensitive diaphragm, and a pressing plate. The periphery of the pressure-sensitive diaphragm is tightly sealed between the valve cover and the valve body. The pressure-sensitive diaphragm and the valve cover form an air cavity, and the valve cover is provided with an air hole. The return spring and the pressing plate are placed in the negative pressure cavity. One end of the control rod is connected to the bottom surface of the pressing plate, and the other end penetrates downward through the valve body. The return spring is arranged in the negative pressure cavity, sleeved on the control rod, and one end acts on the pressure-sensitive diaphragm through the pressing plate, and the other end acts on the inner wall of the negative pressure cavity. A flow limiting groove is formed by inwards concave on the control rod. The control rod moves up and down under the combined action of the negative pressure in the negative pressure cavity, the return spring, the pressing plate, and the pressure-sensitive diaphragm to control the on or off of the water path between the water inlet and the water outlet. In this structure, during the process of water flow through the flow limiting groove of the control rod, the water flow will form an impact on the control rod. This impact will cause the overall shaking of the flow control component, which will affect the smooth effect of fluid flow and will form obvious noise, resulting in poor application effect of the product. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the defects and deficiencies existing in the prior art, and to provide a water pump with a negative pressure valve.

[0004] The technical solution adopted by the utility model is as follows: A water pump with a negative pressure valve includes a housing assembly, a power assembly, and a piston assembly;

[0005] The housing assembly includes a base and a pressurization chamber. An inlet pipe and an outlet pipe are provided on the pressurization chamber. The pressurization chamber is connected to the base to form a piston chamber. The power assembly, the piston assembly, and the sealed check valve assembly form a pressurized delivery function from the inlet pipe to the piston chamber to the outlet pipe.

[0006] The housing assembly further includes a housing and an upper cover connected to each other. The housing is connected to the pressurization chamber to form a water inlet chamber, and the inlet pipe is kept in communication with the water inlet chamber.

[0007] It further includes a negative pressure valve functional assembly. The negative pressure valve functional assembly includes a diaphragm, a sealing head, and a pushing assembly. The diaphragm is fixedly arranged around the circumference between the housing and the upper cover, dividing the chamber formed between the housing and the upper cover into a negative pressure chamber and an atmosphere chamber. An air hole for communicating the atmosphere chamber with the outside is provided on the upper cover. A first through hole and a second through hole are provided on the housing. The first through hole communicates the negative pressure chamber and the water inlet chamber. A third through hole is provided on the pressurization chamber. The second through hole and the third through hole cooperate to form a first flow passage communicating the negative pressure chamber and the piston chamber. The sealing head is arranged in the water inlet chamber and an elastic member acts on the sealing head to block the first through hole. The pushing assembly is arranged between the diaphragm and the sealing head.

[0008] The pushing assembly includes a movable disk and a pushing shaft. The movable disk is fixedly connected to the diaphragm, and the pushing shaft is arranged between the movable disk and the sealing head.

[0009] A connecting sleeve is fixedly arranged on the movable disk. The pushing shaft extends into the connecting sleeve and is tightly fitted and fixed with the connecting sleeve.

[0010] The sealing head is fixed at one end of the movable rod. The elastic member is a spring, and the spring is sleeved on the movable rod and acts on the movable rod to make the sealing head block the first through hole.

[0011] A sealing ring portion is formed on the outer circumference of the first through hole at the bottom of the housing. A first connecting annular seat protrudes corresponding to the sealing ring portion at the upper end of the pressurization chamber. The sealing ring portion extends into the first connecting annular seat, and the sealing ring portion and the first connecting annular seat form a sealed fit through a second O-ring to form a water inlet chamber. One of the annular baffles is arranged corresponding to the outlet end of the inlet pipe and has a height higher than the outlet end of the inlet pipe. The position where the annular baffle is arranged is adapted to the outer circumference of the spring abutment ring to limit the movable rod.

[0012] A limiting groove is provided at the bottom inside the first connecting annular seat. The spring is limited in the limiting groove and its lower end abuts against the bottom of the limiting groove. An annular baffle is provided around the circumference of the bottom inside the first connecting annular seat and the limiting groove, and at least one flow through groove is provided at the upper end of the annular baffle. The height of the annular baffle is higher than the outlet end of the inlet pipe.

[0013] A raised water-sealing seat is formed around the circumference of the first through-hole at the bottom of the housing. The end face of the water-sealing seat is a convex curved surface, and the sealing head is in sealing fit with the end face of the water-sealing seat.

[0014] A plurality of limiting plates are provided at the bottom of the housing, and the plurality of limiting plates are arranged at intervals in a ring shape and distributed on the outer circumference of the sealing head to limit the sealing head.

[0015] The first through-hole is located at the center of the housing, and the second through-hole is located eccentrically outside the sealing ring portion; a second connecting annular seat is formed by the protrusion around the circumference of the third through-hole at the upper end of the pressurizing chamber, and a connecting pipe portion is formed by the protrusion around the outer circumference of the second through-hole at the lower end of the housing. The connecting pipe portion extends into the second connecting annular seat of the pressurizing chamber and is in sealing fit with the second connecting annular seat through a first O-ring.

[0016] The water inlet pipe and the water outlet pipe are straight insertion pipe structures protruding relative to the pressurizing chamber, and the housing is respectively provided with U-shaped grooves for insertion corresponding to the water inlet pipe and the water outlet pipe.

[0017] The beneficial effects of the present utility model are as follows: The structure of the negative pressure valve is integrated into the water pump structure in the present utility model. The integrated structure makes the pipeline connection more convenient and the structure more concise. Moreover, in the negative pressure valve structure of the present utility model, when the sealing head is static, good pressure bearing and sealing effects can be achieved. During operation, the sealing head can be normally open to ensure smooth water flow, enabling the pump body to operate stably and with low noise. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, obtaining other drawings without creative efforts still belongs to the scope of the present utility model.

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0020] Figure 2 It is an exploded view of an embodiment of the present utility model;

[0021] Figure 3 It is a sectional view of an embodiment of the present utility model from one angle;

[0022] Figure 4 It is a schematic structural diagram of the pressurizing chamber in an embodiment of the present utility model;

[0023] Figure 5 It is a schematic structural diagram of a part of the negative pressure valve in an embodiment of the present utility model;

[0024] Figure 6 Schematic diagram of the structure of the housing in an embodiment of the present utility model;

[0025] Figure 7 is Figure 5 Enlarged schematic diagram of part I in

[0026] Figure 8 Cross-sectional view of another angle of an embodiment of the present utility model;

[0027] In the figure, self-tapping screw - 1, upper cover - 2, air hole - 201, diaphragm - 3, movable disc - 4, push shaft - 5, sealing head - 6, movable rod - 7, spring abutting ring - 701, T-shaped connecting block - 702, spring - 8, housing - 9, first through hole - 901, second through hole - 902, water sealing seat - 903, sealing ring part - 904, connecting pipe part - 905, limiting plate - 906, U-shaped groove - 907, first O-ring - 10, second O-ring - 11, pressurizing chamber - 12, water inlet pipe - 1201, water outlet pipe - 1202, third through hole - 1203, first connecting annular seat - 1204, second connecting annular seat - 1205, annular baffle - 1206, flow-through groove - 1207, limiting groove - 1208, sealing gasket - 13, water outlet check valve piece - 14, check valve bracket - 15, water inlet check valve piece - 16, piston - 17, piston bracket - 18, turntable - 19, swing shaft - 20, eccentric wheel - 21, machine screw - 22, base - 23, motor - 24, combined screw - 25;

[0028] Piston chamber - A, negative pressure chamber - B, atmosphere chamber - C, water inlet chamber - D, first flow-through channel - E, second flow-through channel - F. Specific embodiments

[0029] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0030] It should be noted that all the expressions using "first" and "second" in the embodiments of the present utility model are used to distinguish two entities or parameters with the same name but different, so "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present utility model. This will not be elaborated one by one in subsequent embodiments.

[0031] The direction and position terms mentioned in the present utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only with reference to the direction or position of the accompanying drawings. Therefore, the direction and position terms used are for the purpose of explaining and understanding the present utility model, rather than a limitation on the protection scope of the present utility model.

[0032] Such asFigure 1-8 As shown in the figure, a water pump with a negative pressure valve includes a housing assembly, a power assembly, a piston assembly, a sealed check valve assembly, and a negative pressure valve functional assembly.

[0033] The housing assembly includes a base 23, a pressurizing chamber 12, a housing 9, and an upper cover 2 that are connected in sequence. The pressurizing chamber 12 is provided with a water inlet pipe 1201 and a water outlet pipe 1202. The pressurizing chamber 12 and the base 23 are connected to form a piston chamber A. The housing 9 and the upper cover 2 are fixedly connected by self-tapping screws 1, the base 23 and the housing 9 are fixedly connected by combined screws 25, and the pressurizing chamber 12 is limited and fixed between the base 23 and the housing 9. The power assembly, the piston assembly, and the sealed check valve assembly cooperate to form a pressurizing and conveying function from the water inlet pipe 1201 to the piston chamber A to the water outlet pipe 1202.

[0034] The negative pressure valve functional assembly includes a diaphragm 3, a movable disk 4, a push rod 5, a sealing head 6, a movable rod 7, and a spring 8. The diaphragm 3 is fixedly arranged around the circumference between the housing 9 and the upper cover 2, dividing the chamber formed between the housing 9 and the upper cover 2 into a negative pressure chamber B below the diaphragm 3 and an atmospheric chamber C above the diaphragm 3. The upper cover 2 is provided with an air hole 201 for communicating the atmospheric chamber C with the outside. The housing 9 is provided with a first through hole 901 and a second through hole 902. A sealing ring portion 904 is formed at the bottom of the housing 9 on the outer circumference of the first through hole 901. The sealing ring portion 904 is in sealing cooperation with the pressurizing chamber 12 to form a water inlet chamber D between the sealing ring portion 904 and the pressurizing chamber 12. The water inlet pipe 1201 is in communication with the water inlet chamber D. The first through hole 901 communicates the negative pressure chamber B and the water inlet chamber D. The pressurizing chamber 12 is provided with a third through hole 1203. The second through hole 902 and the third through hole 1203 cooperate to form a first flow passage E communicating the negative pressure chamber B and the piston chamber A. The pressurizing chamber 12 is provided with a second flow passage F directly communicating the piston chamber A and the water outlet pipe 1202.

[0035] The water inlet pipe 1201 and the water outlet pipe 1202 are straight insertion pipe structures protruding relative to the pressurizing chamber 12. The housing 9 is respectively provided with U-shaped grooves 907 for insertion corresponding to the water inlet pipe 1201 and the water outlet pipe 1202.

[0036] The movable disk 4 is connected to the lower end of the diaphragm 3. The sealing head 6 is fixed to one end of the movable rod 7, and both are disposed within the water inlet chamber D. The spring 8 is sleeved on the movable rod 7 and acts on the movable rod 7 to cause the sealing head 6 to block the first through hole 901. One end of the push shaft 5 cooperates with the movable disk 4, and the other end extends into the first through hole 901 to cooperate with the sealing head 6. A gap is provided between the push shaft 5 and the first through hole 901 for fluid to pass through. When the pressure in the negative pressure chamber B is less than the atmospheric pressure, the diaphragm 3 drives the movable disk 4 to move downward, and the movable rod 7 pushes the sealing head 6 to move the sealing head 6 downward, thereby connecting the negative pressure chamber B and the water inlet pipe 1201. Specifically, a connection sleeve is fixedly provided on the movable disk 4, and the push shaft 5 extends into the connection sleeve and is fixedly fitted with the connection sleeve in a tight fit.

[0037] The first through hole 901 is located at the center of the housing 9, and the second through hole 902 is located eccentrically outside the sealing ring portion 904.

[0038] A first connecting annular seat 1204 is formed by the upper end of the pressure increasing chamber 12 protruding corresponding to the sealing ring portion 904. The sealing ring portion 904 extends into the first connecting annular seat 1204, and a sealing fit is formed between the sealing ring portion 904 and the first connecting annular seat 1204 through the second O-ring 11. The water inlet pipe 1201 is connected to the side wall of the first connecting annular seat 1204.

[0039] A second connecting annular seat 1205 is formed by the upper end of the pressure increasing chamber 12 protruding circumferentially corresponding to the third through hole 1203. A connecting pipe portion 905 is formed by the lower end of the housing 9 protruding corresponding to the outer circumference of the second through hole 902. The connecting pipe portion 905 extends into the second connecting annular seat 1205 of the pressure increasing chamber 12, and a sealing fit is formed between the connecting pipe portion 905 and the second connecting annular seat 1205 through the first O-ring 10.

[0040] A limiting groove 1208 is provided at the bottom inside the first connecting annular seat 1204. The spring 8 is limited within the limiting groove 1208, and its lower end abuts against the bottom of the limiting groove 1208.

[0041] A spring abutting ring 701 is formed by the outer circumference of the movable rod 7 protruding, and a T-shaped connecting block 702 is provided at the upper end. The sealing head 6 is fixed to the T-shaped connecting block 702, and the upper end of the spring 8 abuts against the spring abutting ring 701.

[0042] An annular baffle 1206 is provided around the bottom inside the first connecting annular seat 1204 and the limiting groove 1208, and at least one flow-through groove 1207 is provided at the upper end of the annular baffle 1206. One of the annular baffles 1206 is disposed corresponding to the outlet end of the water inlet pipe 1201 and has a height higher than the outlet end of the water inlet pipe 1201 to reduce the impact of the fluid. The position of the annular baffle 1206 is adapted to the outer circumference of the spring abutting ring 701 to form a limit on the movable rod 7, enabling it to slide only axially.

[0043] A raised water-sealing seat 903 is formed around the circumference of the first through-hole 901 at the bottom of the housing 9. The end face of the water-sealing seat 903 is a convex curved surface, and the sealing head 6 is in sealing cooperation with the end face of the water-sealing seat 903.

[0044] A number of limiting plates 906 are provided at the bottom of the housing 9, and the number of limiting plates 906 is arranged at intervals in a ring and distributed on the outer periphery of the sealing head 6 to form a limiting effect on the sealing head 6.

[0045] The power assembly includes a motor eccentric wheel 21 and a motor 24. The base 23 and the motor 24 are fixedly connected by a machine screw 22 in a threaded manner, and the central hole of the eccentric wheel 21 is inserted onto the output shaft of the motor 24.

[0046] The piston assembly includes a piston 17, a piston bracket 18, a turntable 19, and a swing shaft 20. The swing shaft 20 is pressed into the central shaft hole of the turntable 19. Five bladder bodies of the piston 17 are assembled and sleeved into the corresponding holes of the piston bracket 18, and five pulling feet of the piston 17 pass through five through-holes of the turntable 19 until the pulling foot steps of the piston 17 pass through the lower arms of the through-holes of the turntable 19. The swing shaft 20 is connected between the turntable 19 and the motor eccentric wheel 21. The function of the swing shaft 20 is to rotate and transmit, for the kinetic energy transmission of the rotation of the motor 24 to drive the piston 17 to extrude and reciprocate. The piston 17 swings up and down through the rotation of the turntable 19, thereby driving the reciprocating motion of the piston.

[0047] The sealing check valve assembly includes a sealing gasket 13, a water outlet check valve piece 14, a check valve bracket 15, and a water inlet check valve piece 16. The water inlet check valve piece 16 is installed in the check valve bracket 15. The central pulling foot of the water inlet check valve piece 16 passes through the central holes of five corresponding annular holes on the periphery of the check valve bracket 15 until the pulling foot steps of the water inlet check valve piece 16 pass through the bottom plane of the check valve bracket 15. The five water inlet check valve pieces 16 are respectively installed in the corresponding positions. The pulling foot of the water outlet check valve piece 14 is installed in the check valve bracket 15, and the sealing gasket 13 is installed in the corresponding positioning posts of the check valve bracket 15. The water inlet check valve piece 16 and the check valve bracket 15 cooperate to form the conduction in the direction from the water inlet pipe 1201 to the pressurization chamber 12 and the cut-off in the reverse direction. The water outlet check valve piece 14 and the check valve bracket 15 cooperate to form the conduction in the direction from the pressurization chamber 12 to the water outlet pipe 1202 and the cut-off in the reverse direction. The reciprocating motion of the piston enables the fluid to enter in the direction from the water inlet pipe 1201 to the pressurization chamber 12 and be discharged in the direction from the pressurization chamber 12 to the water outlet pipe 1202, realizing the pressurized transportation of the fluid from the water inlet pipe 1201 to the water outlet pipe 1202.

[0048] The pressurization chamber 12 is connected to the check valve bracket 15, and the sealing gasket 13 is arranged between the pressurization chamber 12 and the check valve bracket 15 to ensure the sealing performance.

[0049] Fluid operation process: The front-end water source enters the water inlet pipe 1201 and reaches the water inlet cavity D. The water inlet cavity D and the negative pressure cavity B are sealed and isolated by the sealing head 6, and the spring 8 keeps the seal in a normally closed state. After the motor 24 is powered on and operates, the piston 17 reciprocates, and air enters the piston cavity A from the water inlet check valve piece 16, causing the pressure in the negative pressure cavity B to become lower and form a negative pressure state. After the negative pressure cavity B forms a negative pressure, the diaphragm 3 adsorbs and pulls down to drive the movable disk 4 to press down, and the push rod 5 pushes out the sealing head 6. When the water pump continues to work, the negative pressure cavity B maintains a negative pressure state, making the sealing head 6 in a normally open state. At this time, water enters the negative pressure cavity B from the water inlet cavity D. Through the reciprocating work of the water pump piston cavity, the fluid enters the negative pressure cavity B from the water inlet cavity D, enters the piston cavity A from the negative pressure cavity B, and then flows out from the water outlet pipe 1202.

[0050] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A water pump with a negative pressure valve, comprising a housing assembly, a power assembly, and a piston assembly; The housing assembly includes a base and a booster chamber, the booster chamber is provided with a water inlet pipe and a water outlet pipe, and the booster chamber is connected to the base to form a piston chamber; the power assembly, the piston assembly, and the sealing one-way valve assembly form a booster conveying function from the water inlet pipe to the piston chamber to the water outlet pipe; Features: The housing assembly further comprises a housing and an upper cover connected to each other, the housing is connected to the pressurizing chamber to form a water inlet cavity, and the water inlet pipe is connected to the water inlet cavity; It also includes a negative pressure valve functional component, which includes a diaphragm, a sealing head, and a pushing component. The diaphragm is circumferentially fixed between the shell and the upper cover to separate the chamber formed between the shell and the upper cover into a negative pressure chamber and an atmospheric chamber. The upper cover is provided with an air hole for connecting the atmospheric chamber with the outside world. The shell is provided with a first through hole and a second through hole. The first through hole connects the negative pressure chamber and the water inlet chamber. The booster chamber is provided with a third through hole. The second through hole and the third through hole cooperate to form a first flow channel connecting the negative pressure chamber and the piston chamber. The sealing head is arranged in the water inlet chamber and is provided with an elastic member to act with the sealing head to block the first through hole. The pushing component is arranged between the diaphragm and the sealing head.

2. The water pump with a negative pressure valve according to claim 1, characterized in that: The pushing assembly comprises a movable disk and a pushing shaft. The movable disk is fixedly connected to the diaphragm, and the pushing shaft is arranged between the movable disk and the sealing head.

3. The water pump with a negative pressure valve according to claim 2, characterized in that: A connecting sleeve is fixedly provided on the movable disk, and the driving shaft extends into the connecting sleeve and is tightly matched and fixed with the connecting sleeve.

4. The water pump with a negative pressure valve according to claim 1, characterized in that: The sealing head is fixed on one end of the movable rod, the elastic member is a spring, and the spring is sleeved on the movable rod and acts on the movable rod to make the sealing head block the first through hole.

5. The water pump with a negative pressure valve according to claim 4, characterized in that: A sealing ring portion is formed at the bottom of the shell at the periphery of the first through hole, and a first connecting annular seat is formed by a protrusion corresponding to the sealing ring portion at the upper end of the booster chamber. The sealing ring portion extends into the first connecting annular seat, and the sealing ring portion and the first connecting annular seat form a sealed fit through a second O-ring to form a water inlet cavity, and the water inlet pipe is connected to the side wall of the first connecting annular seat.

6. The water pump with a negative pressure valve according to claim 5, characterized in that: A limiting groove is provided at the bottom of the first connecting annular seat, and the spring is limited in the limiting groove and its lower end abuts against the bottom of the limiting groove; an annular baffle is provided at the bottom of the first connecting annular seat and around the limiting groove, and at least one flow groove is opened at the upper end of the annular baffle, one of the annular baffles is arranged corresponding to the outlet end of the water inlet pipe and its height is higher than the outlet end of the water inlet pipe, and the setting position of the annular baffle is adapted to the outer periphery of the spring abutment ring to limit the movable rod.

7. The water pump with a negative pressure valve according to claim 6, characterized in that: A raised water sealing seat is formed at the bottom of the shell around the first through hole, the end face of the water sealing seat is a convex curved surface, and the sealing head is in sealing cooperation with the end face of the water sealing seat.

8. The water pump with a negative pressure valve according to claim 1, characterized in that: A plurality of limiting plates are arranged at the bottom of the shell body, and the limiting plates are arranged in an annular manner and distributed on the outer periphery of the sealing head to form a limiting effect on the sealing head.

9. The water pump with a negative pressure valve according to any one of claims 1 to 8, characterized in that: The first through hole is located at the center of the shell, and the second through hole is located at an eccentric position outside the sealing ring part; the upper end of the boosting chamber corresponds to the circumferential protrusion of the third through hole to form a second connecting annular seat, and the lower end of the shell corresponds to the outer peripheral protrusion of the second through hole to form a connecting pipe part, and the connecting pipe part extends into the second connecting annular seat of the boosting chamber and forms a sealing fit with the second connecting annular seat through the first O-ring.

10. The water pump with a negative pressure valve according to any one of claims 1 to 8, characterized in that: The water inlet pipe and the water outlet pipe are straight-inserted pipe structures protruding relative to the pressurization chamber, and the shell is respectively provided with U-shaped grooves for insertion corresponding to the water inlet pipe and the water outlet pipe.

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