CN214616986U

CN214616986U - Pressure relief structure of flow control pump

Info

Publication number: CN214616986U
Application number: CN202120656446.5U
Authority: CN
Inventors: 周如景
Original assignee: Zhongshan Willpower Motor & Electric Appliance Co ltd
Current assignee: Zhongshan Willpower Motor & Electric Appliance Co ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-11-05
Anticipated expiration: 2031-03-31

Abstract

The utility model relates to a pressure relief structure of a flow control pump, which comprises a pump head body, wherein a first water inlet cavity, a pressurizing cavity and a water outlet cavity are arranged in the pump head body, the first water inlet cavity and the water outlet cavity are respectively communicated with a first water inlet and a water outlet, the flow control pump also comprises a negative pressure valve seat, a vacuum cavity is arranged in the negative pressure valve seat, a second water inlet cavity is also arranged in the pump head body, the vacuum cavity is communicated with the second water inlet cavity through a water inlet flow passage, the second water inlet cavity is communicated with the pressurizing cavity through a one-way water flow control structure, a water sealing sleeve ring and a flow control component for controlling the water path at the water sealing sleeve ring to be sealed or conducted are formed on a water path communicated with the first water inlet cavity and the vacuum cavity, and a pressure relief structure is arranged on a water path between the water outlet cavity and the water outlet, and is respectively communicated with the vacuum cavity through a backflow hole in the negative pressure valve seat body and communicated with the water outlet cavity through a pressure relief hole in the pump head body. The utility model discloses can be better to output hydraulic control, go out the difficult suppressing pressure of water cavity department for the pressure boost diaphragm is not fragile, pressure release simple structure.

Description

Pressure relief structure of flow control pump

Technical Field

The utility model relates to a fluid conveying equipment technical field especially relates to a pressure release structure of accuse flow pump.

Background

The water supply pump is used as an important device for doing work on fluid in the fluid conveying process, and is widely applied to the existing industrial production and human life.

When the existing water dispenser uses a water supply pump, a normal pressure water tank is usually arranged, and the water supply pump pumps water from the normal pressure water tank and supplies water to a heating unit. When the water dispenser system is not provided with the normal-pressure water tank and a pressure water source is used for supplying water to the heating unit instead, the function of the water supply pump is insufficient, the water supply pump in the water dispenser industry needs to be added with a stopping function and a flow regulating function, and meanwhile, the water outlet also has a pressure relief function, so that the damage of a pressurizing diaphragm caused by long-time pressure build-up is avoided.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a accuse flow pump suitable for have pressure and non-pressure water source and accessible pressure release structure control output water pressure is provided.

In order to solve the technical problem, the utility model discloses a following scheme:

the utility model provides a pressure release structure of accuse pump that flows, accuse pump that flows includes the pump head body, is equipped with first intake antrum, pressure boost chamber, goes out the water cavity in the pump head body, and first intake antrum, play water cavity are put through with first water inlet, delivery port respectively, still include the negative pressure disk seat, are equipped with the vacuum cavity in the negative pressure disk seat, still are equipped with the second intake antrum in the pump head body, and the vacuum cavity passes through into water runner and second intake antrum switch-on, and the second intake antrum passes through one-way rivers control structure and pressure boost chamber switch-on, constitute the accuse that has the water seal lantern ring and control water seal lantern ring department water route sealed or switch on the water route of first intake antrum, vacuum cavity switch-on the water route between water cavity and the delivery port and be equipped with pressure release structure, pressure release structure switches on with the vacuum cavity through backward flow hole on the negative pressure valve seat body and the pressure release hole on the pump head body respectively.

Preferably, the pressure release structure includes the pressure release chamber, seal the water bulge loop, pressure release spring and pressure release diaphragm, the pressure release chamber comprises the mutual lock of opening form recess on negative pressure disk seat body and the pump head body, seal the water bulge loop and set up in pressure release hole periphery and constitute by the pump head body, the pressure release diaphragm sets up in seal water bulge loop department and is located the pressure release intracavity, the peripheral sealed pressure of pressure release diaphragm is between pump head body and negative pressure disk seat, the pressure release diaphragm closes on peripheral position and is equipped with the return water mouth, pressure release spring is located the pressure release intracavity and one end acts on pressure release intracavity wall, the other end acts on the pressure release diaphragm.

Preferably, the flow control assembly comprises a control rod, a return spring and a pressure sensing diaphragm, the periphery of the pressure sensing diaphragm is hermetically fixed between the negative pressure valve seat and the valve cover, the pressure sensing diaphragm and the valve cover form an atmospheric cavity, and the valve cover is provided with an atmospheric hole; the side wall of the control rod is provided with a flow limiting groove, one end of the control rod is fixedly connected with the middle part of the pressure sensing diaphragm, and the other end of the control rod seals the water sealing lantern ring; one end of the return spring acts on the control rod, the other end acts on the inner wall of the negative pressure valve seat, and the control rod forms a sealing water lantern ring or a flow control assembly for controlling the conduction of the sealing water lantern ring under the combined action of air pressure in the atmosphere cavity, pressure in the vacuum cavity and the return spring.

The related components of the existing water supply pump only have the function of water cut-off and do not have the function of regulating output flow under the condition of a pressure water source, the scheme arranges a vacuum cavity communicated with a second water inlet cavity in a negative pressure valve seat, when the flow control pump does not work, the flow control assembly controls the water path at the water sealing sleeve ring to be sealed, when the booster pump works, water flow or air in the vacuum cavity is sucked away to form a certain vacuum degree, at the moment, the flow control assembly controls the water path at the water sealing sleeve ring to be conducted, the flow after conduction is related to the vacuum degree in the vacuum cavity, the higher the vacuum degree is, the larger the flow after conduction is, the smaller the vacuum degree is, the smaller the flow after conduction is, the vacuum degree in the vacuum cavity can be adjusted when the water supply pump works by adjusting the working voltage (power) of the water supply pump, consequently adopt the utility model discloses a structural design can be in order to adjust the output flow of accuse stream pump during operation through adjusting the operating voltage (power) of water supply pump.

Preferably, the return spring is arranged in the vacuum cavity, one end of the return spring acts on the control rod, and the other end of the return spring acts on the inner wall of the vacuum cavity.

Preferably, the periphery of the lower end of the control rod is in sealing connection with the water sealing port through a first sealing ring, and the first sealing ring is tightly pressed in a groove formed between the pump head body and the negative pressure valve seat. The sealing performance of control lever department is strengthened to first sealing washer, avoids the water of vacuum chamber to get into first intake antrum prematurely.

Preferably, a second sealing ring is arranged on the outer side of the first sealing ring, and the second sealing ring is tightly pressed in a groove formed between the pump head body and the negative pressure valve seat. The second sealing ring strengthens the sealing performance of the connection between the negative pressure valve seat and the pump head body.

Preferably, the pump head body is detachably connected with the negative pressure valve seat through a fastening screw. The pump head body and the negative pressure valve seat can be conveniently replaced and disassembled.

Preferably, a third sealing ring is sleeved on the outer side of the water inlet flow channel and is arranged between the pump head body and the negative pressure valve seat body in a sealing mode. The third sealing ring strengthens the sealing performance of the connection between the negative pressure valve seat and the pump head body.

Preferably, the pressurizing cavity is communicated with the water outlet cavity through a one-way water flow control structure. The one-way water flow control structure can effectively prevent water in the water outlet cavity from flowing backwards.

The utility model discloses beneficial effect who has:

1. the utility model discloses a set up pressure release structure on the water route of play water cavity and delivery port, when the water pressure by pressure boost chamber to delivery port surpassed the pressure release value, pressure release structure enables the water that the part is located delivery port department and gets into the vacuum cavity once more, the effect of rethread pump gets into the pressure boost chamber, make the delivery port form the backward flow water like this, thereby it is difficult for producing the phenomenon of suppressing pressure to have avoided too much water in the overstock of play water cavity, make the water pressure in the pressure boost chamber can not be too big, avoid causing the damage to the pressure boost diaphragm, thereby the cost of maintenance of accuse flow pump has been reduced, pressure release structure is simple, make the cost lower, the water pressure of ability effective control output.

2. When the utility model does not work, the flow control component has the function of water cut-off; when the flow control pump works, the output flow of the flow control pump can be adjusted by adjusting the working voltage (power) of the flow control pump.

Drawings

FIG. 1 is a schematic structural diagram of embodiments 1-9 of the present invention;

FIG. 2 is a schematic structural diagram of embodiments 1-9 of the present invention;

fig. 3 is a schematic structural diagram of embodiments 1 to 9 of the present invention.

The labels in the figure and the corresponding part names: 01-a first water inlet, 02-a pump head body, 03-a second sealing ring, 04-a first sealing ring, 05-a valve cover, 06-a return spring, 07-a control rod, 08-a pressure sensing diaphragm, 09-a vacuum chamber, 10-a first water inlet chamber, 11-a negative pressure valve seat, 12-a water inlet channel, 13-a third sealing ring, 14-a second water inlet chamber, 15-a second water inlet, 16-a first one-way diaphragm, 17-a pressurizing chamber, 18-a pressurizing diaphragm, 19-a flow limiting groove, 20-a water outlet, 21-a pressure relief hole, 22-a pressure relief diaphragm, 23-a pressure relief spring, 24-a return hole, 25-a water sealing convex ring, 26-a pressure relief chamber, 27-a water return port, 28-a fastening screw, and 29-a side channel, 30-second one-way diaphragm, 31-water outlet cavity, 32-water sealing ring, 33-atmosphere cavity and 34-atmosphere hole.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and the terms are only for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be further noted that, unless otherwise explicitly specified or limited, the terms "disposed," "opened," "mounted," "connected," and "connected" are to be construed broadly, e.g., as either a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1-3, a pressure relief structure of a flow control pump includes a pump body 02, a first water inlet cavity 10, a pressure increasing cavity 17, and a water outlet cavity 31 are provided in the pump body 02, the first water inlet cavity 10 and the water outlet cavity 31 are respectively connected to a first water inlet 01 and a water outlet 20, the pressure control pump further includes a negative pressure valve seat 11, a vacuum cavity 09 is provided in the negative pressure valve seat 11, a second water inlet cavity 14 is further provided in the pump body 02, the vacuum cavity 09 is connected to the second water inlet cavity 14 through a water inlet channel 12, the second water inlet cavity 14 is connected to the pressure increasing cavity 17 through a one-way water flow control structure (a first one-way diaphragm 16), a water sealing collar 32 and a flow control component for controlling water path sealing or conduction at the water sealing collar 32 are formed on a water path connected between the water outlet cavity 31 and the water outlet 20, the pressure relief structure is respectively connected to the

vacuum cavity

09, 09 through a backflow hole 24 on a body of the negative pressure valve seat 11, And the pressure relief hole 21 on the body of the pump head body 02 is communicated with the water outlet cavity 31.

The working principle of the embodiment is as follows: the flow control pump of the embodiment is suitable for pressure and non-pressure water sources, and when the flow control pump does not work, the flow control assembly controls the water path at the water sealing sleeve ring 32 to be sealed; when the flow control pump works, water flow or air in the vacuum cavity 09 is sucked away to form a certain vacuum degree, at the moment, the flow control assembly controls the water sealing sleeve ring 32 to be communicated with a water channel, the communicated flow is related to the vacuum degree in the vacuum cavity 09, the higher the vacuum degree is, the larger the communicated flow is, the smaller the vacuum degree is, the smaller the communicated flow is, and the working voltage (power) of the booster pump can be adjusted to adjust the vacuum degree in the vacuum cavity 09 when the flow control pump works, so that the flow control pump can be adjusted to work by adjusting the working voltage (power) of the flow control pump; compared with the prior art, set up pressure release structure in the water route of going out water cavity 31 and delivery port 20 in this embodiment, when the water pressure by pressure boost chamber 17 to delivery port 20 was too high, pressure release structure enables wherein partial water to get into vacuum cavity 0909 once more, the effect of rethread pump gets into pressure boost chamber 17, form the backward flow, thereby it is difficult for producing the phenomenon of suppressing pressure to have avoided too much water to accumulate in a water cavity 31, make the water pressure in pressure boost chamber 17 can not be too big, avoid causing the damage to pressure boost diaphragm 18, thereby the cost of maintenance of accuse pump has been reduced, pressure release structure is simple, make the cost lower, can effectively control the water pressure of output.

Example 2

As shown in fig. 3, the pressure relief structure includes a pressure relief cavity 26, a water sealing convex ring 25, a pressure relief spring 23 and a pressure relief diaphragm 22, the pressure relief cavity 26 is formed by mutually fastening open grooves on the negative pressure valve seat 11 body and the pump head body 02 body, the water sealing convex ring 25 is arranged around the pressure relief hole 21 and formed by the pump head body 02 body, the pressure relief diaphragm 22 is arranged at the water sealing convex ring 25 and located in the pressure relief cavity 26, the periphery of the pressure relief diaphragm 22 is tightly sealed and pressed between the pump head body 02 and the negative pressure valve seat 11, the pressure relief diaphragm 22 is provided with a water return port 27 near the periphery, the pressure relief spring 23 is located in the pressure relief cavity 26, one end of the pressure relief spring acts on the inner wall of the pressure relief cavity 26, and the other end of the pressure relief diaphragm 22 acts on the pressure relief diaphragm.

The specific working principle of this embodiment is as follows: after the water source of the pressurizing cavity 17 continuously enters the water outlet cavity 31, the amount of water in the waterway from the water outlet cavity 31 to the water outlet 20 is continuously increased, when the amount of water in the water outlet 20 is limited to be discharged and pressure is suppressed in the water outlet cavity 31, at this time, the excessive amount of water starts to extrude the pressure relief diaphragm 22 upwards through the pressure relief hole 21 on the waterway of the water outlet 20, the pressure starts to increase along with the continuous increase of the amount of water, the elastic force of the pressure relief spring 23 is overcome, the pressure relief diaphragm 22 releases the seal of the water sealing convex ring 25, water flows through the water return port 27 at the periphery of the pressure relief diaphragm 22 to enter the pressure relief cavity 26, then enters the vacuum cavity 09 through the return port 24, and finally is conveyed to the pressurizing cavity 17 and the water outlet cavity 31 again to form pressure relief backflow, so that the water pressure of the water outlet 20 is controlled, the water outlet cavity 31 cannot generate an overpressure phenomenon, the pressurizing diaphragm 18 is not easy to be damaged, when the water pressure is not enough to overcome the elastic force of the pressure relief spring 23, the water sealing convex ring 25 at the pressure relief hole 21 is sealed under the combined action of the pressure relief spring 23 and the pressure relief diaphragm 22, the pressure relief backflow waterway is isolated, and the water quantity from the pressurization cavity 17 is normally discharged through the water outlet 20.

Example 3

As shown in fig. 1-3, the flow control assembly includes a control rod 07, a return spring 06, and a pressure sensing diaphragm 08, the periphery of the pressure sensing diaphragm 08 is hermetically fixed between the negative pressure valve seat 11 and the valve cover 05, the pressure sensing diaphragm 08 and the valve cover 05 form an atmosphere cavity 33, and the valve cover 05 is provided with an atmosphere hole 34; the side wall of the control rod 07 is provided with a flow limiting groove 19, one end of the control rod 07 is fixedly connected with the middle part of the pressure sensing diaphragm 08, and the other end of the control rod 07 is sealed with a water sealing lantern ring 32; one end of the return spring 06 acts on the control rod 07, the other end acts on the inner wall of the negative pressure valve seat 11, and the control rod 07 forms the flow control assembly for sealing the water lantern ring 32 or controlling the conduction of the water sealing lantern ring 32 under the combined action of the air pressure in the atmosphere cavity 33, the pressure in the vacuum cavity 09 and the return spring 06.

The specific working principle of this embodiment is as follows: when the flow control pump does not work, the sum of the acting force of the pressure in the vacuum cavity 09 and the elastic force of the return spring 06 on the pressure sensing diaphragm 08 is larger than the acting force of the air pressure in the atmosphere cavity 33 on the pressure sensing diaphragm 08, and the control rod 07 seals the water sealing lantern ring 32 under the combined action of the acting force; when the flow control pump works, water flow or air in the vacuum cavity 09 is sucked away to form a certain vacuum degree, at the moment, the sum of acting forces of the pressure in the vacuum cavity 09 and the elastic force of the return spring 06 on the pressure sensing diaphragm 08 is smaller than the acting force of the pressure in the atmosphere cavity 33 on the pressure sensing diaphragm 08, the control rod 07 moves downwards (in the direction of the first water inlet cavity 10) under the combined action of the acting forces, the fact that the flow limiting groove 19 is arranged on the side wall of the control rod 07 means that the lower end of the control rod 07 is not provided with the flow limiting groove 19, the side wall above the lower end is provided with the flow limiting groove 19, the part of the lower end of the control rod 07 without the flow limiting groove 19 completely moves downwards into the first water inlet cavity 10, and when the control rod continues to move downwards, the first water inlet cavity 10 is communicated with the vacuum cavity 09 through the flow limiting groove 19. When the flow limiting groove 19 of the control rod 07 just moves downwards into the first water inlet cavity 10, the flow channel of the first water inlet cavity 10 communicated with the vacuum cavity 09 through the flow limiting groove 19 is small, the flow rate pumped by the flow control pump is small, if the control rod 07 moves downwards continuously, the part of the control rod 07 with the flow limiting groove 19 moves downwards into the first water inlet cavity 10 for a longer distance, the flow channel area of the first water inlet cavity 10 communicated with the vacuum cavity 09 through the flow limiting groove 19 is increased, and the flow rate pumped by the flow control pump is increased. Therefore, by adjusting the working voltage (power) of the current control pump, the vacuum in the vacuum chamber 09 can be adjusted, and the distance of the control rod 07 moving downwards is adjusted, so that the function of adjusting the output flow of the current control pump is achieved.

Example 4

The reset spring 06 is arranged in the vacuum cavity 09, one end of the reset spring 06 acts on the control rod 07, and the other end of the reset spring 06 acts on the inner wall of the vacuum cavity 09.

Example 5

As shown in fig. 1, the periphery of the lower end of the control rod 07 is connected with the water sealing port in a sealing manner through a first sealing ring 04, and the first sealing ring 04 is tightly pressed and arranged in a groove formed between the pump head body 02 and the negative pressure valve seat 11. The first sealing ring 04 strengthens the sealing performance of the control rod 07, and prevents water in the vacuum cavity 09 from entering the first water inlet cavity 10 too early.

Example 6

As shown in fig. 1, a second sealing ring 03 is disposed on the outer side of the first sealing ring 04, and the second sealing ring 03 is tightly pressed in a groove formed between the pump head body 02 and the negative pressure valve seat 11. The second sealing ring 03 enhances the sealing performance of the connection between the negative pressure valve seat 11 and the pump head body 02.

Example 7

As shown in fig. 3, the pump head body 02 is detachably connected to the negative pressure valve seat 11 by a fastening screw 28. The pump head body 02 and the negative pressure valve seat 11 are convenient to replace and disassemble.

Example 8

As shown in fig. 2, a third sealing ring 13 is sleeved on the outer side of the water inlet flow passage 12, and the third sealing ring 13 is hermetically arranged between the body of the pump head body 02 and the body of the negative pressure valve seat 11. The third seal ring 13 enhances the sealing performance of the connection between the negative pressure valve seat 11 and the pump head body 02.

Example 9

As shown in FIG. 3, the pumping chamber 17 communicates with the outlet chamber 31 via a one-way flow control structure (second one-way diaphragm 30). The one-way water flow control structure can effectively prevent water in the water outlet cavity 31 from flowing backwards.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and the technical essence of the present invention is that within the spirit and principle of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments are all within the protection scope of the technical solution of the present invention.

Claims

1. A pressure relief structure of a flow control pump comprises a pump body (02), wherein a first water inlet cavity (10), a pressurizing cavity (17) and a water outlet cavity (31) are arranged in the pump body (02), the first water inlet cavity (10) and the water outlet cavity (31) are respectively communicated with a first water inlet (01) and a water outlet (20), the flow control pump further comprises a negative pressure valve seat (11), a vacuum cavity (09) is arranged in the negative pressure valve seat (11), a second water inlet cavity (14) is also arranged in the pump body (02), the vacuum cavity (09) is communicated with the second water inlet cavity (14) through a water inlet flow channel (12), the second water inlet cavity (14) is communicated with the pressurizing cavity (17) through a one-way water flow control structure, and a flow control assembly which is provided with a water sealing sleeve ring (32) and controls the water path at the water sealing sleeve ring (32) to be sealed or communicated is formed on the water path communicated with the first water inlet cavity (10) and the vacuum cavity (09), and a pressure relief structure is arranged on a water path between the water outlet cavity (31) and the water outlet (20), and is respectively communicated with the vacuum cavity (09) through a backflow hole (24) on the negative pressure valve seat (11) body and communicated with the water outlet cavity (31) through a pressure relief hole (21) on the pump head body (02) body.

2. The pressure relief structure of a flow control pump according to claim 1, wherein said pressure relief structure comprises a pressure relief cavity (26), a water sealing bulge loop (25), pressure release spring (23) and pressure release diaphragm (22), pressure release chamber (26) are buckled each other by the opening form recess on negative pressure disk seat (11) body and the pump head body (02) body and are constituted, seal water bulge loop (25) set up in pressure release hole (21) periphery and constitute by pump head body (02) body, pressure release diaphragm (22) set up in seal water bulge loop (25) department and lie in pressure release chamber (26), pressure release diaphragm (22) periphery is sealed to be compressed tightly between pump head body (02) and negative pressure disk seat (11), pressure release diaphragm (22) are close to peripheral position and are equipped with return water mouth (27), pressure release spring (23) are located pressure release chamber (26) and one end acts on pressure release chamber (26) inner wall, the other end acts on pressure release diaphragm (22).

3. The pressure relief structure of a flow control pump according to claim 1, wherein the flow control assembly comprises a control rod (07), a return spring (06), and a pressure sensing diaphragm (08), the periphery of the pressure sensing diaphragm (08) is hermetically fixed between a negative pressure valve seat (11) and a valve cover (05), the pressure sensing diaphragm (08) and the valve cover (05) form an atmosphere cavity (33), and the valve cover (05) is provided with an atmosphere hole (34); a flow limiting groove (19) is formed in the side wall of the control rod (07), one end of the control rod (07) is fixedly connected with the middle part of the pressure sensing diaphragm (08), and the other end of the control rod is sealed with a water sealing lantern ring (32); one end of the return spring (06) acts on the control rod (07), the other end acts on the inner wall of the negative pressure valve seat (11), and the control rod (07) forms a flow control assembly for sealing the water sleeve ring (32) or controlling the conduction of the water sealing sleeve ring (32) under the combined action of the air pressure in the atmosphere cavity (33), the pressure in the vacuum cavity (09) and the return spring (06).

4. The pressure relief structure of a flow control pump according to claim 3, wherein the return spring (06) is disposed in the vacuum chamber (09), and the other end of the return spring (06) acts on the inner wall of the vacuum chamber (09).

5. The pressure relief structure of a flow control pump according to claim 3, characterized in that the periphery of the lower end of the control rod (07) is connected with the water sealing port in a sealing manner through a first sealing ring (04), and the first sealing ring (04) is tightly pressed and arranged in a groove formed between the pump head body (02) and the negative pressure valve seat (11).

6. The pressure relief structure of a flow control pump according to claim 5, wherein a second sealing ring (03) is arranged outside the first sealing ring, and the second sealing ring (03) is tightly pressed and arranged in a groove formed between the pump head body (02) and the negative pressure valve seat (11).

7. The pressure relief structure of a flow control pump according to claim 1, wherein the pump head body (02) is detachably connected to the negative pressure valve seat (11) by a fastening screw (28).

8. The pressure relief structure of a flow control pump according to claim 1, wherein a third sealing ring (13) is sleeved outside the water inlet flow channel (12), and the third sealing ring (13) is hermetically arranged between the pump head body (02) and the negative pressure valve seat (11) body.

9. A pressure relief structure for a flow control pump according to claim 1, characterized in that said pressurizing chamber (17) is connected to the outlet chamber (31) by a one-way flow control structure.