Pressure release valve structure of diaphragm booster pump

Abstract

The utility model discloses a diaphragm booster pump pressure release valve structure which comprises a shell, a high-pressure area, a low-pressure area, a pressure release valve arranged on the shell and a pressure release module which is arranged on the shell and matched with the pressure release valve to enable fluid to complete pressure release operation. The pressure relief module comprises a buffer area abutting against the pressure relief valve and a first cavity providing a moving space for the pressure relief valve. One end of the buffer area is communicated with the low-pressure area, and the other end of the buffer area is communicated with the high-pressure area. The buffer area is arranged, after fluid in the high-pressure area is buffered through the buffer area, the pressure of the position, making contact with the pressure release valve, of fluid flowing to the low-pressure area tends to be uniform, the problems that the pressure release valve frequently jumps and is unstable in pressure are avoided, meanwhile, the first cavity is arranged, the moving space of the pressure release valve is enlarged, and the pressure release valve is more stable. The pressure relief valve has enough space to move in the pressure relief process, and the operation stability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of booster pumps, and in particular relates to a pressure relief valve structure of a diaphragm booster pump. Background Art

[0002] The main function of the booster pump is to pressurize the fluid and transport it to the outside. In order to prevent the fluid pressure generated by the internal pressurization of the booster pump from being greater than the bearing pressure of the equipment, a pressure relief valve structure needs to be added to deal with the situation of excessive pressure, diverting and releasing the fluid in the high-pressure area to the low-pressure area, thereby achieving the purpose of reducing pressure and protecting the booster pump; However, at present, due to the design of the upper cover of the pressure relief valve structure using the thickness support of the injection molding material with compressive stress, the risk of shrinkage and deformation of the plastic thickness causes slow surge, which has always been a major hidden danger after the industry's products are launched. The structure has a certain deformation risk, forming the defect of the valve cover slow surge risk, and the parts of the pressure relief valve that bear external forces are subjected to different pressures, and the uneven pressure will cause frequent pressure fluctuations and unstable pressure, which is more likely to cause water leakage. Utility Model Content

[0003] The utility model aims to provide a diaphragm booster pump pressure relief valve structure to solve the above-mentioned technical problems, and to set a buffer zone so that after the fluid in the high-pressure zone is buffered by the buffer zone, the pressure at the position where the fluid flowing to the low-pressure zone contacts the pressure relief valve tends to be uniform, thereby avoiding the problem of frequent beating and unstable pressure of the pressure relief valve. At the same time, a first cavity is set to increase the space for the pressure relief valve to move, so that the pressure relief valve has enough space to move during the pressure relief process, thereby improving the stability of the operation.

[0004] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0005] A diaphragm booster pump pressure relief valve structure includes a housing, a high-pressure area, a low-pressure area, a pressure relief valve disposed on the housing, and a pressure relief module disposed on the housing and cooperating with the pressure relief valve to enable the fluid to complete the pressure relief operation, wherein the pressure relief module includes a buffer zone that conflicts with the pressure relief valve and a first cavity that provides a moving space for the pressure relief valve; one end of the buffer zone is connected to the low-pressure area, and the other end of the buffer zone is connected to the high-pressure area. The buffer zone is provided so that after the fluid in the high-pressure area is buffered by the buffer zone, the pressure at the position where the fluid flowing to the low-pressure area contacts the pressure relief valve tends to be uniform, thereby avoiding the problem of frequent beating and unstable pressure of the pressure relief valve. At the same time, the first cavity is provided to increase the moving space of the pressure relief valve, so that the pressure relief valve has enough space to move during the pressure relief process, thereby improving the stability of the operation.

[0006] Preferably, the buffer zone includes a seat body, a plurality of first bosses spaced apart on the seat body, a first notch disposed between the first bosses, a second boss disposed in the middle of the seat body, and an annular zone disposed between the first boss and the second boss and connected to the first notch;

[0007] The upper end surface of the first boss and the upper end surface of the second boss both conflict with the pressure relief valve. The first notch is set between the first boss in the circumferential direction; the annular area connects the low-pressure area and the high-pressure area in the pressure relief state. A seat body, a first boss, a second boss, a first notch, and an annular area are set. When the high-pressure area is under a relatively high pressure, the fluid flows to the annular area through multiple first notches, so that the pressure of the fluid is relatively balanced in all directions and acts on the pressure relief valve, so that the external force borne by the contact surface between the pressure relief valve and the fluid is relatively uniform, avoiding the problem of frequent jumping due to uneven force. When the pressure is relatively high, the fluid pushes the pressure relief valve to move, releasing the contact state with the first boss and the second boss, thereby completing the pressure relief.

[0008] Preferably, the upper end surface of the first boss is flush with the upper end surface of the second boss. The first boss and the second boss are arranged flush with each other, so that the upper surface is relatively flat, and the contact and fit between the pressure relief valve and the first boss and the second boss are improved, thereby improving the sealing degree in the non-pressure relief state; at the same time, the problem of frequent jumping of the pressure relief valve due to different pressures caused by being in different planes is avoided.

[0009] Preferably, a flow passage communicating with the high-pressure zone is provided below the buffer zone, the flow passage is arranged around the outer edge of the seat body, and the flow passage is communicated with the first notch. The flow passage is arranged around the outer edge of the seat body and communicated with the first notch, so that the flow passage communicating with the high-pressure zone first flows to the first notch through the surrounding path, so that the pressure of the fluid flowing to each first notch is relatively uniform.

[0010] Preferably, the buffer zone also includes a pressure relief channel connected to the low-pressure zone, and the pressure relief channel is arranged inside the second boss, and the pressure relief channel is arranged coaxially with the second boss. The pressure relief channel is arranged below the pressure relief valve; the pressure relief channel is arranged inside the second boss, and when the pressure relief valve is moved by a larger pressure, there is a gap between the pressure relief valve and the second boss, and the fluid flows through the annular area to the top of the second boss, and flows to the low-pressure zone through the pressure relief channel, thereby completing the pressure relief; the pressure relief channel flows through the annular area to the pressure relief channel in the middle, which is conducive to the pressure relief valve to bear more balanced forces in all directions, avoiding the problem of frequent jumping.

[0011] Preferably, the first boss and the second boss are coaxially arranged on the seat body. The coaxial arrangement allows the first boss and the second boss to form a surrounding state, and the first notch is also in a surrounding state, so that the pressure of the inflowing high-pressure fluid in each first notch is more uniform.

[0012] Preferably, the pressure relief valve comprises an elastic part connected to the housing, a pressure relief valve cap arranged at one end of the elastic part, the lower end of the pressure relief valve cap conflicts with the upper end of the first boss, the lower end of the pressure relief valve cap conflicts with the upper end of the second boss, and the pressure relief valve cap is arranged in the first cavity in cooperation. The elastic part makes the pressure relief valve cap in a non-pressure relief state conflict with the first boss and the second boss, so that the fluid flows through the first notch and the annular area.

[0013] Preferably, a fitting part is provided at the upper edge of the pressure relief valve bonnet, and the pressure relief module further comprises a second cavity providing a moving space for the pressure relief valve, the second cavity is provided above the first cavity, and a fitting end fitting with the fitting part is provided below the second cavity. The first cavity and the second cavity are coaxially provided, and the diameter of the first cavity is smaller than the diameter of the second cavity; the cross-sectional shape of the pressure relief valve bonnet is circular, and a fitting part is provided at the upper edge of the pressure relief valve bonnet, wherein the fitting part and the fitting end fit together, so as to improve the sealing performance of the pressure relief valve bonnet and the second cavity, thereby improving the sealing degree of the pressure relief valve bonnet and avoiding the problem of frequent jumping caused by low sealing degree.

[0014] Preferably, a resisting seat body is arranged between the elastic part and the pressure relief valve cap, one end of the resisting seat body is connected to the end of the elastic part, and the other end of the resisting seat body resists the upper surface of the pressure relief valve cap. The elastic part is a spring, and the resisting seat body is arranged to avoid direct connection with the end of the pressure relief valve cap, wherein the cross section of the resisting seat body is a "convex" shape, so that the contact area between the pressure relief valve cap and the resisting seat body is larger, thereby improving the service life of the resisting seat body.

[0015] Preferably, the pressure relief valve further comprises a pressure relief valve upper cover connected to the elastic portion, and the pressure relief valve upper cover is fixedly connected to the housing;

[0016] A sealing end is arranged at the lower end of the pressure relief valve upper cover, and a fitting surface which fits with the shell is arranged on the pressure relief valve upper cover.

[0017] A sealing end is provided. When the pressure relief valve cap is lifted up, the upper end of the pressure relief valve cap contacts the sealing end to prevent the fluid from flowing to the outside from the sealing end. At the same time, a fitting surface is provided on the upper cover of the pressure relief valve to improve the tightness of the fit between the upper cover of the pressure relief valve and the shell, thereby improving the overall sealing effect.

[0018] This application has achieved beneficial technical effects:

[0019] The utility model provides a buffer zone, so that after the fluid in the high-pressure zone is buffered by the buffer zone, the pressure at the position where the fluid flowing to the low-pressure zone contacts the pressure relief valve tends to be uniform, thereby avoiding the problem of frequent beating of the pressure relief valve and unstable pressure. At the same time, a first cavity is provided to increase the space for the pressure relief valve to move, so that the pressure relief valve has enough space to move during the pressure relief process, thereby improving the stability of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a schematic diagram of the structure of the utility model;

[0021] Figure 2 Shown is a bottom view structural schematic diagram of the utility model;

[0022] Figure 3 Shown Figure 2 AA section structural diagram;

[0023] Figure 4 Shown is a schematic diagram of the explosion structure of the utility model;

[0024] Figure 5 Shown is another exploded structure schematic diagram of the utility model;

[0025] Figure 6 Shown is another exploded structure schematic diagram of the utility model;

[0026] Figure 7 Shown is a schematic diagram of the housing structure of the utility model;

[0027] Figure 8 Shown Figure 7 BB-direction cross-sectional structural diagram;

[0028] Fig. 9 Shown is a schematic diagram of the arrangement structure of the flow passage;

[0029] Fig.10 The figure shows a cross-sectional structural diagram of a pressure relief valve of an old technical solution;

[0030] Fig.11 Shown is a schematic diagram of the exploded structure of the old technical solution.

[0031] Reference numerals

[0032] 1-shell; 11-high pressure area; 12-low pressure area; 13-pressure relief valve; 141-buffer zone; 142-first cavity; 1410-seat; 1411-first boss; 1412-first notch; 1413-second boss; 1414-annular area; 143-flow passage; 144-pressure relief passage; 131-elastic part; 132-pressure relief valve cap; 1321-fitting part; 145-second cavity; 1451-fitting end; 133-contact seat; 134-pressure relief valve cover; 1341-sealing end; 1342-fitting surface;

[0033] 71-valve body; 72-valve cap; 73-elastic part; 137-first communication port; 14-second communication port; 15-contact ring; 74-contact block; 121-first contact platform; 122-second contact platform; 123-third contact platform. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0035] The technical solution of the utility model is described in detail below with specific embodiments.

[0036] A diaphragm booster pump pressure relief valve structure includes a housing 1, a high-pressure area 11, a low-pressure area 12, a pressure relief valve 13 arranged on the housing, and a pressure relief module arranged on the housing 1 and cooperating with the pressure relief valve 13 to enable the fluid to complete the pressure relief operation, wherein the pressure relief module includes a buffer zone 141 that conflicts with the pressure relief valve 13 and a first cavity 142 that provides a moving space for the pressure relief valve 13; one end of the buffer zone 141 is connected to the low-pressure area 12, and the other end of the buffer zone 141 is connected to the high-pressure area 11. The buffer zone 141 is provided so that after the fluid in the high-pressure area 11 is buffered by the buffer zone 141, the pressure at the position where the fluid flowing to the low-pressure area 12 contacts the pressure relief valve tends to be uniform, thereby avoiding the problem of frequent jumping and unstable pressure of the pressure relief valve 13. At the same time, the first cavity 142 is provided to increase the moving space of the pressure relief valve 13, so that the pressure relief valve 13 has enough space to move during the pressure relief process, thereby improving the stability of the operation.

[0037] The buffer zone 141 includes a base 1410, a plurality of first bosses 1411 spaced apart on the base 1410, a first notch 1412 disposed between the first bosses 1411, a second boss 1413 disposed in the middle of the base 1410, and an annular zone 1414 disposed between the first boss 1411 and the second boss 1413 and connected to the first notch 1412;

[0038] The upper end surface of the first boss 1411 and the upper end surface of the second boss 1413 are both in conflict with the pressure relief valve 13. The first notch 1412 is set between the first boss 1411 in the circumferential direction; the annular area 1414 is connected to the low-pressure area 12 and the high-pressure area 11 in the pressure relief state. The seat body 1410 and the first boss 1411, the second boss 1413, the first notch 1412, and the annular area 1414 are set. When the high-pressure area 11 is under a relatively high pressure, the fluid flows to the annular area 1414 through the multiple first notches 1412, so that the pressure of the fluid is relatively balanced in all directions, and acts on the pressure relief valve 13, so that the external force on the contact surface of the pressure relief valve 13 and the fluid is relatively uniform, avoiding the problem of frequent jumping due to uneven force. When the pressure is relatively high, the fluid pushes the pressure relief valve 13 to move, releases the contact state with the first boss 1411 and the second boss 1413, and completes the pressure relief.

[0039] The upper end surface of the first boss 1411 is flush with the upper end surface of the second boss 1413. The first boss 1411 and the second boss 1413 are arranged flush with each other, so that the upper surface is relatively flat, and the contact and fit between the pressure relief valve 13 and the first boss 1411 and the second boss 1413 is improved, thereby improving the sealing degree in the non-pressure relief state; at the same time, the problem of frequent jumping of the pressure relief valve due to different pressures caused by being in different planes is avoided.

[0040] A flow passage 143 communicating with the high pressure area 11 is disposed below the buffer area 142. The flow passage 143 is disposed around the outer edge of the seat body 1410, and the flow passage 143 is communicated with the first notch 1412. The flow passage 143 is disposed around the outer edge of the seat body 1410 and is communicated with the first notch 1412, so that the flow passage 143 communicating with the high pressure area 11 first flows to the first notch 1412 through the surrounding path, so that the pressure of the fluid flowing to each first notch 1412 is more uniform.

[0041] The buffer zone 141 also includes a pressure relief channel 144 connected to the low-pressure zone 12, and the pressure relief channel 144 is arranged inside the second boss 1413, and the pressure relief channel 144 is arranged coaxially with the second boss 1413. The pressure relief channel 144 is arranged below the pressure relief valve 13; the pressure relief channel 144 is arranged inside the second boss 1413, and when the pressure relief valve 13 is moved by a larger pressure so that there is a gap between the pressure relief valve 13 and the second boss 1413, the fluid flows through the annular area 1414 to the top of the second boss 1413, and flows to the low-pressure zone 12 through the pressure relief channel 144, thereby completing the pressure relief; the pressure relief channel 144 in the middle is circulated through the annular area 1414, which is conducive to the pressure relief valve 13 to bear a more balanced force in all directions, avoiding the problem of frequent jumping.

[0042] The first boss 1411 and the second boss 1413 are coaxially arranged on the seat body 1410. The coaxial arrangement allows the first boss 1411 and the second boss 1413 to form a surrounding state, and the first notch 1412 is also in a surrounding state, so that the pressure of the inflowing high-pressure fluid in each first notch 1412 is more uniform.

[0043] The pressure relief valve 13 includes an elastic part 131 connected to the housing 1, and a pressure relief valve cap 132 disposed at one end of the elastic part 131, wherein the lower end of the pressure relief valve cap 132 conflicts with the upper end of the first boss 1411, and the lower end of the pressure relief valve cap 132 conflicts with the upper end of the second boss 1413, and the pressure relief valve cap 132 is cooperatively disposed in the first cavity 142. The elastic part 131 causes the pressure relief valve cap 132 to conflict with the first boss 1411 and the second boss 1413 in a non-pressure relief state, so that the fluid flows through the first notch 1412 and the annular area 1414.

[0044] The upper edge of the pressure relief valve bonnet 132 is provided with a fitting portion 1321. The pressure relief module further includes a second cavity 145 that provides a moving space for the pressure relief valve 13. The second cavity 145 is provided above the first cavity 142. A fitting end 1451 that fits with the fitting portion 1321 is provided below the second cavity 145. The first cavity 142 and the second cavity 145 are coaxially arranged. The diameter of the first cavity 142 is smaller than the diameter of the second cavity 145. The cross-sectional shape of the pressure relief valve bonnet 132 is circular. The fitting portion 1321 is provided at the upper edge of the pressure relief valve bonnet 132. The fitting portion 1321 fits with the fitting end 1451, thereby improving the sealing performance of the pressure relief valve bonnet 132 and the second cavity 145, thereby improving the sealing degree of the pressure relief valve bonnet 132 and avoiding the problem of frequent jumping caused by low sealing degree.

[0045] A resisting seat body 133 is arranged between the elastic part 131 and the pressure relief valve cap 132, one end of the resisting seat body 133 is connected to the end of the elastic part 131, and the other end of the resisting seat body 133 resists the upper surface of the pressure relief valve cap 132. The elastic part 131 is a spring, and the resisting seat body 133 is arranged to avoid direct connection with the end of the pressure relief valve cap 132, wherein the cross section of the resisting seat body 133 is a "convex" shape, so that the contact area between the pressure relief valve cap 132 and the resisting seat body 133 is larger, thereby improving the service life of the resisting seat body 133.

[0046] The pressure relief valve 13 further includes a pressure relief valve upper cover 134 connected to the elastic portion 131 , and the pressure relief valve upper cover 134 is fixedly connected to the housing 1 ;

[0047] A sealing end 1341 is disposed at the lower end of the pressure relief valve upper cover 134 , and a fitting surface 1342 that fits with the housing 1 is disposed on the pressure relief valve upper cover 1341 .

[0048] A sealing end 1341 is provided. When the pressure relief valve cap 132 is lifted up, the upper end of the pressure relief valve cap 132 contacts the sealing end 1341 to prevent the fluid from flowing to the outside from where the sealing end 1341 is provided. At the same time, a fitting surface 1342 is provided on the pressure relief valve upper cover 134 to improve the tightness of the fitting between the pressure relief valve upper cover 134 and the housing 1, thereby improving the overall sealing effect.

[0049] The pressure relief valve upper cover 134 is provided with a plurality of reinforcing ribs 1343, which enhance the mechanical strength of the pressure relief valve upper cover and prevent it from being deformed under continuous spring force.

[0050] When the closed pressure of the pressure regulating valve is adjusted to 170psi, the spring pressure only needs 5.7KG; compared with the old technical solution, the old technical solution requires 7.8KG when the closed pressure of the pressure regulating valve is adjusted to 170psi, and the spring pressure value is reduced by 2.1KG, which means that the bearing pressure of the pump head and the pressure valve cover is reduced. Figures 9 and 10 As shown, in the old technical solution, the pressure relief valve is assembled by sequentially arranging the valve body 71, the elastic part 73, the abutment block 74, and the valve cap 72. The lower end of the valve cap 72 abuts against the upper end surface of the first abutment platform 121, the upper end surface of the second abutment platform 122, the upper end surface of the third abutment platform 123, and the abutment ring 15. In this technical solution, after the fluid enters from the first communication port 137, it is diverted to the first abutment platform 121 through the second abutment platform. This diversion method only diverts one angle, which is not suitable for the fluid flow. The pressure distribution in the process is not evenly distributed, so the pressure on the valve cap 72 is uneven in a certain area at the bottom. In this technical solution, the fluid flows to the annular area 1414 through multiple first notches 1412, so that the pressure of the fluid is more balanced in all directions and acts on the pressure relief valve 13, so that the external force on the contact surface between the pressure relief valve 13 and the fluid is more uniform. In combination with the reinforcing ribs 1343 set above the pressure relief valve, it is not easy to deform under continuous spring force. The water pump pressure value is not easy to drop. It effectively solves the problem of pressure drop after long-term storage.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

[0053] The above is a detailed description of an embodiment of a diaphragm booster pump pressure relief valve structure provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A diaphragm booster pump pressure relief valve structure, comprising a housing (1), a high pressure area (11), a low pressure area (12), a pressure relief valve (13) arranged on the housing, and a pressure relief module arranged on the housing (1) and cooperating with the pressure relief valve (13) to enable the fluid to complete the pressure relief operation, characterized in that: The pressure relief module comprises a buffer zone (141) that contacts the pressure relief valve (13) and a first cavity (142) that provides a moving space for the pressure relief valve (13); one end of the buffer zone (141) is connected to the low-pressure zone (12), and the other end of the buffer zone (141) is connected to the high-pressure zone (11).

2. The diaphragm booster pump pressure relief valve structure according to claim 1, characterized in that: The buffer zone (141) comprises a seat body (1410), a plurality of first bosses (1411) arranged at intervals on the seat body (1410), a first notch (1412) arranged between the first bosses (1411), a second boss (1413) arranged in the middle of the seat body (1410), and an annular zone (1414) arranged between the first boss (1411) and the second boss (1413) and connected to the first notch (1412); The upper end surface of the first boss (1411) and the upper end surface of the second boss (1413) both abut against the pressure relief valve (13).

3. The diaphragm booster pump pressure relief valve structure according to claim 2, characterized in that: The upper end surface of the first boss (1411) is flush with the upper end surface of the second boss (1413).

4. The diaphragm booster pump pressure relief valve structure according to claim 2, characterized in that: A flow passage (143) communicating with the high-pressure zone (11) is disposed below the buffer zone (141); the flow passage (143) is disposed around the outer edge of the seat body (1410); and the flow passage (143) is communicated with the first notch (1412).

5. The diaphragm booster pump pressure relief valve structure according to claim 2, characterized in that: The buffer zone (141) further comprises a pressure relief channel (144) connected to the low-pressure zone (12); the pressure relief channel (144) is arranged to penetrate the interior of the second boss (1413); the pressure relief channel (144) and the second boss (1413) are arranged coaxially.

6. The diaphragm booster pump pressure relief valve structure according to claim 2, characterized in that: The first boss (1411) and the second boss (1413) are coaxially arranged on the seat body (1410).

7. The diaphragm booster pump pressure relief valve structure according to claim 2, characterized in that: The pressure relief valve (13) comprises an elastic portion (131) connected to the housing (1), and a pressure relief valve cap (132) arranged at one end of the elastic portion (131); the lower end of the pressure relief valve cap (132) abuts against the upper end of the first boss (1411); the lower end of the pressure relief valve cap (132) abuts against the upper end of the second boss (1413); and the pressure relief valve cap (132) is cooperatively arranged in the first cavity (142).

8. The diaphragm booster pump pressure relief valve structure according to claim 7, characterized in that: An engaging portion (1321) is provided at the upper edge of the pressure relief valve cap (132), and the pressure relief module further comprises a second cavity (145) for providing a moving space for the pressure relief valve (13), the second cavity (145) is provided above the first cavity (142), and an engaging end (1451) engaged with the engaging portion (1321) is provided below the second cavity (145).

9. The diaphragm booster pump pressure relief valve structure according to claim 7, characterized in that: A resisting seat body (133) is arranged between the elastic part (131) and the pressure relief valve cap (132), one end of the resisting seat body (133) is connected to the end of the elastic part (131), and the other end of the resisting seat body (133) resists against the upper surface of the pressure relief valve cap (132).

10. The diaphragm booster pump pressure relief valve structure according to claim 7, characterized in that: The pressure relief valve (13) further comprises a pressure relief valve upper cover (134) connected to the elastic portion (131), and the pressure relief valve upper cover (134) is fixedly connected to the housing (1); A sealing end (1341) is provided at the lower end of the pressure relief valve upper cover (134), and a fitting surface (1342) that fits the housing (1) is provided on the pressure relief valve upper cover (134).

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