Self-pressure-relief assembly and circulating water pump with same

Abstract

The utility model provides a self-pressure-relief assembly and a circulating water pump with the self-pressure-relief assembly, and belongs to the technical field of water pumps. The self-pressure-relief assembly is arranged in a pump body, a water inlet and a water outlet are formed in the pump body, a circulation cavity is formed between the water inlet and the water outlet, and the circulation cavity is communicated with the water outlet through a pressure stabilizing opening and communicated with the water inlet through a pressure relief opening. The self-pressure-relief assembly comprises a blocking piece and an elastic piece, the blocking piece is arranged at the pressure stabilizing opening, and the elastic piece is arranged between the blocking piece and the inner wall of the circulating cavity; the elastic piece applies acting force to the plugging piece to enable the plugging piece to plug the pressure stabilizing opening. The assembly is applied to the water pump, full-mechanical automatic pressure relief can be achieved, reliability is high, and stable operation of the water pump can be maintained; and the structure is compact, the cost is low, integration is easy, and the manufacturing cost of the water pump is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump technical field especially relates to a kind of self pressure relief subassembly and the circulating water pump with the component. BACKGROUND

[0002] As a common fluid conveying device, circulating water pump is widely used in various cleaning, cooling, circulating systems, and its function is to pressurize the input liquid to the preset pressure and then output, to meet the working requirements of the system. During operation, the circulating water pump and its connected pipeline system often face various pressure abnormal conditions, for example: (1) when the water pump is suddenly started or stopped or the valve is quickly closed, the inertia of the fluid can cause the pressure in the pipeline to rise sharply, generating shock waves, which may cause damage to the pump body, pipe fittings or connection parts; (2) due to adjustment failure, external water supply pressure fluctuation or system blockage, the inlet or outlet pressure of the pump may be abnormally high, and long-term overpressure operation will accelerate equipment fatigue, seal aging and performance degradation; (3) in low temperature environment, the water in the pump cavity or pipeline freezes and expands, which can easily cause the pump body to crack, the seal to fail or the structure to deform.

[0003] At present, the common pressure protection method of circulating water pump is to add an electromagnetic valve in the water pump to cooperate with a pressure sensor, and to control the start and stop of the motor by detecting the pressure signal. However, this method not only increases the electrical complexity and manufacturing cost of the equipment, but also makes the overall structure more bulky, especially not conducive to application in small and integrated devices.

[0004] Therefore, it is necessary to improve the existing pressure protection method of circulating water pump to overcome the defects of the prior art. INVENTION CONTENTS

[0005] To overcome the problems in the related art, one of the purposes of the present utility model is to provide a self pressure relief subassembly, which is applied in a water pump and can realize full mechanical automatic pressure relief, has high reliability, helps to maintain the stable operation of the water pump, has compact structure, low cost and is easy to integrate, and helps to reduce the manufacturing cost of the water pump.

[0006] A self pressure relief subassembly is arranged in a pump body, the pump body has a water inlet and a water outlet, a circulating cavity is arranged between the water inlet and the water outlet, the circulating cavity is communicated with the water outlet through a pressure stabilizing port and communicated with the water inlet through a pressure relief port;

[0007] The self pressure relief subassembly comprises a plugging member and an elastic member, the plugging member is arranged at the pressure stabilizing port, and the elastic member is arranged between the plugging member and the inner wall of the circulating cavity; the elastic member applies a force to the plugging member to block the pressure stabilizing port.

[0008] In the preferable technical scheme of the utility model, the self pressure relief assembly further includes a pressure regulating assembly; one side of the circulation cavity is provided with a mounting position, and the pressure regulating assembly is movably arranged in the mounting position;

[0009] One end of the elastic member abuts at the pressure stabilizing port, and the opposite end abuts on the pressure regulating assembly; the compression amount of the elastic member can be changed by moving the pressure regulating assembly, so that the elastic pre-tightening force of the elastic member is adjusted.

[0010] In the preferable technical scheme of the utility model, the pressure regulating assembly includes a pressure regulating seat and a sealing ring, the pressure regulating seat is threadedly connected with the mounting position; a limiting column is arranged on the pressure regulating seat, one end of the elastic member is clamped on the limiting column, and the sealing ring is arranged on the pressure regulating seat, and the outer wall of the sealing ring abuts against the inner wall of the mounting position.

[0011] In the preferable technical scheme of the utility model, one side of the pressure regulating assembly is provided with a control structure, the control structure is exposed outside the circulation cavity, and the control structure is used for controlling the movement of the pressure regulating assembly.

[0012] In the preferable technical scheme of the utility model, a plurality of elastic members are arranged on one side of the plugging member, and the plurality of elastic members are uniformly distributed on one side of the plugging member along the circumferential direction of the elastic member.

[0013] In the preferable technical scheme of the utility model, one side of the plugging member, which is connected with the pressure stabilizing port, is provided with a flow guide surface, and the cross section of the flow guide surface gradually increases in the direction from the pressure stabilizing port to the elastic member.

[0014] The second purpose of the application is to provide a circulating water pump, which comprises the pump body and the self pressure relief assembly.

[0015] In the preferable technical scheme of the utility model, the circulation cavity is provided with a flow guide structure, and the flow guide structure comprises a plurality of convex ribs arranged on the inner wall of the circulation cavity, and the convex ribs are uniformly distributed on the inner wall of the circulation cavity along the circumferential direction of the circulation cavity.

[0016] In the preferable technical scheme of the utility model, in the circulation cavity, the height of the convex rib gradually increases in the direction from the pressure stabilizing port to the pressure relief port.

[0017] The utility model has the advantages of:

[0018] The utility model provides a kind of self pressure relief assembly, the self pressure relief assembly is arranged in pump body, there is inlet and outlet in pump body, circulation cavity is arranged between inlet and outlet, circulation cavity is communicated with outlet by pressure stabilizing port, and is communicated with inlet by pressure relief port.The self pressure relief assembly includes plugging piece and elastic piece, plugging piece is arranged at pressure stabilizing port, and elastic piece is arranged between plugging piece and the inner wall of circulation cavity;Elastic piece exerts force on plugging piece to make plugging piece block pressure stabilizing port.The component is applied in water pump, in use process, when the pressure of outlet side is too high, exceeds the pre-tightening force provided by elastic piece to plugging piece, plugging piece is pushed, and elastic piece is compressed and moves to the inside of circulation cavity, to open pressure stabilizing port.Make the high-pressure fluid of outlet side can enter circulation cavity and finally return to inlet side.When the pressure of outlet side returns to normal, elastic piece will push plugging piece reset, so that plugging piece re-blocks pressure stabilizing port.The whole pressure relief process is only balanced relation of fluid pressure and mechanical spring force to trigger and control, without any electronic sensor, control circuit or solenoid valve.Moreover, the component structure is simple, and action is direct, avoid the problem that electronic component is affected by damp, high temperature environment and fails, with extremely high reliability and durability in harsh working conditions.The component can relieve pressure in time, to prevent the condition that motor is burnt due to long time overload operation of water pump, also eliminates the damage of mechanical parts caused by high system pressure, helps to prolong the service life of water pump as a whole.In addition, the self pressure relief assembly is mainly composed of a small amount of mechanical parts, can be very compactly integrated in water pump cover or pump body, almost does not increase the overall volume of water pump.Saved expensive pressure switch, controller and solenoid valve, can reduce the material cost and assembly complexity of product, especially conducive to popularization in cost-sensitive household or small commercial equipment.

[0019] The application also provides a circulating water pump comprising the self pressure relief assembly, which can automatically relieve pressure through the pressure relief assembly, so that the water pump can be stably operated for a long time, and the long-term stable operation of the water pump is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the perspective view of the self pressure relief assembly provided in the embodiment of the utility model;

[0021] Figure 2 is the schematic view of the self pressure relief assembly provided in the embodiment of the utility model and arranged in pump body;

[0022] Figure 3 is the schematic view of the pump body without the self pressure relief assembly in the circulation cavity provided in the embodiment of the utility model;

[0023] Figure 4 is the perspective view of the circulating water pump provided in the embodiment of the utility model;

[0024] Figure 5 Figure 1 is a front view of a circulating water pump according to an embodiment of the present application.

[0025] Reference signs:

[0026] 1, plugging member; 2, elastic member; 3, pressure regulating seat; 31, sealing ring; 32, control structure; 33, limiting column; 100, pump body; 101, water outlet; 102, water inlet; 103, circulating cavity; 1031, pressure stabilizing port; 1032, pressure relief port; 1033, protruding rib. DETAILED DESCRIPTION

[0027] Preferred embodiments of the present application will be described in more detail by referring to the attached drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to convey the scope of the present application to those skilled in the art.

[0028] The common pressure protection method for circulating water pumps at present is to add an electromagnetic valve in the water pump in cooperation with a pressure sensor to control the start and stop of the motor by detecting the pressure signal. However, this method not only increases the electrical complexity and manufacturing cost of the equipment, but also makes the overall structure more bulky, which is particularly not conducive to application in small and integrated devices.

[0029] Based on this, the present application provides a self-pressure relief assembly.

[0030] Embodiment 1

[0031] As shown in Figures 1-3 , the self-pressure relief assembly provided in the present embodiment is arranged in a pump body 100, the pump body 100 has a water inlet 102 and a water outlet 101, a circulating cavity 103 is arranged between the water inlet 102 and the water outlet 101, the circulating cavity 103 is in communication with the water outlet 101 through a pressure stabilizing port 1031 and in communication with the water inlet 102 through a pressure relief port 1032.

[0032] The self-pressure relief assembly comprises a plugging member 1 and an elastic member 2, the plugging member 1 is arranged at the pressure stabilizing port 1031, and the elastic member 2 is arranged between the plugging member 1 and the inner wall of the circulating cavity 103; the elastic member 2 applies a force to the plugging member 1 so that the plugging member 1 plugs the pressure stabilizing port 1031.

[0033] Specifically, the blocking member 1 is movably arranged in the circulation cavity 103, and is located opposite to the pressure stabilizing port 1031. The blocking member 1 can be in the form of a plunger, a piston or a ball, and the end of the blocking member 1 close to the pressure stabilizing port 1031 is usually designed as a conical surface, a spherical surface or a flat surface, so as to form an effective sealing fit with the edge of the pressure stabilizing port 1031.

[0034] The elastic member 2 is arranged in the circulation cavity 103, and is located on the side of the blocking member 1 away from the pressure stabilizing port 1031. One end of the elastic member 2 acts on the blocking member 1, and the other end abuts against the inner wall of the circulation cavity 103 or a support structure fixed in the cavity. The elastic member 2 continuously applies an elastic force to the blocking member 1, which is directed to the pressure stabilizing port 1031, so that the blocking member 1 keeps closed to the pressure stabilizing port 1031 in the normal state. In the normal state, the elastic member 2 can be in a compressed state, so that the elastic member 2 applies an elastic force to the blocking member 1, which is directed to the pressure stabilizing port 1031. In actual application, the elastic member 2 can be a spring.

[0035] The pressure relief assembly is applied to a circulation water pump, and has the following specific embodiments:

[0036] When the water pump is normally working, the pressure on the outlet side 101 is within the design range. The pressure acts on the blocking member 1, but is insufficient to overcome the pre-tightening force of the elastic member 2, so the blocking member 1 keeps stationary, the pressure stabilizing port 1031 is closed, and all the fluid is normally output from the outlet 101.

[0037] If the downstream pressure of the outlet 101 is abnormally increased due to the valve being closed or the pipeline being blocked, the fluid pressure acting on the blocking member 1 is also increased. When the pressure exceeds the pre-tightening force of the elastic member 2, the blocking member 1 is pushed, the elastic member 2 is compressed, and the blocking member 1 moves to the inside of the circulation cavity 103, so as to open the pressure stabilizing port 1031.

[0038] After the pressure stabilizing port 1031 is opened, the high-pressure fluid can flow into the circulation cavity 103 through the port, and then flow back to the inlet side 102 through the pressure relief port 1032, so as to form an internal pressure relief circulation path. This process can quickly release the excess pressure of the system.

[0039] When the abnormally high pressure is released, and the pressure of the system falls to the normal range, the restoring force of the elastic member 2 will push the blocking member 1 to reset, reseal the pressure stabilizing port 1031, stop the pressure relief circulation, and restore the system to the normal state.

[0040] The self-pressure relief assembly described above completely relies on the balance between the fluid pressure and the mechanical elastic force to act, and does not need any electronic sensor or electromagnetic valve. The structure is simple, and there is no complex circuit. The self-pressure relief assembly is not sensitive to the environmental humidity and temperature, has strong anti-interference ability, can still maintain stable and reliable pressure relief function in long-term use or in harsh working conditions, and has low maintenance requirement.

[0041] When the system appears "pressure holding", the assembly can quickly respond to open the internal pressure relief channel, to avoid the continuous accumulation of pressure resulting in water pump motor overload operation. This fundamentally prevents the motor from burning due to excessive current, and avoids the damage of mechanical parts in the pump due to bearing high pressure, thereby significantly prolonging the service life of the water pump.

[0042] Compared with the traditional pressure protection method (cut off the power supply of the motor after detecting high pressure), the assembly does not need to stop the water pump motor during pressure relief. The motor keeps running continuously, eliminating the current impact and mechanical stress caused by frequent start and stop, which is not only beneficial to the motor itself, but also makes the system output more stable, avoiding the pressure fluctuation and water experience interruption caused by start and stop.

[0043] In addition, the self-pressure relief assembly is mainly composed of several simple mechanical parts, which can be ingeniously built into the pump cover or pump body 100 chamber, almost without additional increase in the overall size and complexity of the product. It eliminates external pressure switches, controllers and expensive components such as electromagnetic valves, greatly reducing material costs and assembly complexity, which is particularly beneficial to the promotion and application in household and small commercial equipment that focuses on cost-effectiveness.

[0044] In a better implementation, the self-pressure relief assembly further comprises a pressure regulating assembly; one side of the circulation cavity 103 is provided with a mounting position, and the pressure regulating assembly is movably arranged in the mounting position;

[0045] One end of the elastic member 2 abuts against the pressure stabilizing port 1031, and the opposite end abuts against the pressure regulating assembly; by moving the pressure regulating assembly, the compression amount of the elastic member 2 can be changed, so as to adjust the size of the elastic pre-tightening force of the elastic member 2.

[0046] Further, the pressure regulating assembly comprises a pressure regulating seat 3 and a sealing ring 31, the pressure regulating seat 3 is threadedly connected with the mounting position; the pressure regulating seat 3 is provided with a limiting column 33, one end of the elastic member 2 is clamped on the limiting column 33, and the sealing ring 31 is arranged on the pressure regulating seat 3 and the outer wall of the sealing ring 31 abuts against the inner wall of the mounting position.

[0047] The end of the circulation cavity 103 (i.e. the end away from the pressure stabilizing port 1031) is provided with a mounting position, which is usually a blind hole or a through hole structure with internal threads. The pressure regulating assembly is movably arranged in the mounting position.

[0048] Specifically, one end of the elastic member 2 acts on the back of the plugging member 1, and the opposite end acts on the pressure regulating assembly. By screwing in or out the pressure regulating assembly, it can be moved axially to change the compression amount of the elastic member 2, so as to accurately adjust the elastic pre-tightening force of the plugging member 1, and then set the trigger pressure value of the pressure relief action.

[0049] The outer periphery of the pressure regulating seat 3 is provided with external threads, which are matched with the internal threads of the mounting site to form a threaded connection. The corresponding end of the elastic member 2 (for example, a spring) can be sleeved or clamped on the limiting column, which can ensure that the elastic member 2 remains stable and centered during compression and recovery, preventing deflection, jamming, or abnormal wear, thereby ensuring the accuracy of pressure regulation and the reliability of action.

[0050] The sealing ring 31 (which can be an O-ring) is arranged in a sealing groove specially arranged on the pressure regulating seat 3. When the pressure regulating assembly is installed in the mounting site, the outer peripheral wall of the sealing ring 31 is in elastic close contact with the inner wall of the mounting site, thereby forming an effective static sealing barrier between the pressure regulating assembly and the pump body 100, preventing high-pressure fluid from leaking out from the threaded gap or the mounting site, and ensuring the sealing integrity of the entire pressure relief chamber.

[0051] The pressure regulating seat 3 and the mounting site are connected by threads to achieve the regulation function, and the specially configured sealing ring 31 independently undertakes the sealing task of preventing fluid leakage. This design solves the problem of dynamic sealing at the movable part, ensures that there is no leakage, and does not sacrifice the fundamental reliability of the component as a pressure part while giving the component flexibility.

[0052] Further, one side of the pressure regulating assembly is provided with a control structure 32, which is exposed outside the circulating cavity 103. The control structure 32 is used to control the movement of the pressure regulating assembly.

[0053] Specifically, the specific form of the control structure 32 can be a slot for clamping a tool (such as a screwdriver or an internal hexagonal wrench), a polygonal (such as a hexagonal) head for turning by hand or a wrench, or a knurled knob for easy manual rotation. By adding a threaded connection pressure regulating assembly with an exposed control structure 32, users or maintenance personnel can conveniently and continuously adjust the pressure relief trigger pressure from the outside without disassembling the water pump.

[0054] Further, a plurality of elastic members 2 are arranged on one side of the plugging member 1, and the plurality of elastic members 2 are uniformly distributed along the circumference of the elastic member 2 on one side of the plugging member 1.

[0055] In another embodiment, a plurality of elastic members 2 are uniformly distributed around the central axis of the plugging member 1 along the circumference thereof. For example, two, three, or four identical spiral springs can be arranged in a symmetrical array. This multi-point uniform distribution of elastic support can ensure that the plugging member 1 always bears uniform and coaxial axial force during reciprocating motion, effectively preventing deflection, jamming, or local wear caused by single-point force, thereby greatly improving the smoothness of the action of the plugging member 1, the stability of the seal, and the working life of the entire assembly.

[0056] Further, the side of the blocking member 1 connected with the pressure stabilizing port 1031 is provided with a flow guide surface, and the cross section of the flow guide surface gradually increases along the direction from the pressure stabilizing port 1031 to the elastic member 2.

[0057] In actual application, the cross section of the flow guide surface gradually increases. The flow guide surface can be a tapered surface, a spherical surface or a gradually expanding surface composed of complex curved surfaces. The function of the flow guide surface is that when the high-pressure fluid pushes the blocking member 1 to move and the pressure stabilizing port 1031 is opened, the fluid will smoothly spread along the flow guide surface and flow into the circulation cavity 103, which can significantly reduce the local flow rate, relieve fluid impact, reduce vortex and pressure fluctuation, make the pressure relief process more stable and quiet, and also help to reduce the erosion of the fluid to the blocking member 1 and the inner wall of the circulation cavity 103.

[0058] Embodiment 2

[0059] As shown in Figures 1-5 The embodiment provides a circulating water pump, which comprises the pump body 100 and the self-pressure relief assembly as described above.

[0060] Preferably, a flow guide structure is arranged in the circulation cavity 103, and the flow guide structure comprises a plurality of convex ribs 1033 arranged on the inner wall of the circulation cavity 103.

[0061] Further, in the circulation cavity 103, the height of the convex rib 1033 gradually increases along the direction from the pressure stabilizing port 1031 to the pressure relief port 1032.

[0062] Along the main flow direction of the fluid (i.e. the direction from the pressure stabilizing port 1031 to the pressure relief port 1032), the protruding height of the convex rib 1033 (i.e. the radial dimension from the inner wall of the cavity) is designed to gradually increase. The gradually changing height of the convex rib 1033 makes the cross section of the guide channel defined by the convex rib 1033 gradually narrow along the flow direction. The convex rib 1033 can produce a gradual constraint and guiding effect on the high-speed fluid ejected from the pressure stabilizing port 1031, so that the kinetic energy of the fluid is more smoothly converted into pressure energy, and the fluid flows to the pressure relief port 1032 along the preset path more efficiently and stably, which can reduce local vortex, flow noise and irreversible pressure loss.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0064] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0065] In addition, it needs to be explained that the use of "first", "second" and the like to limit the parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning if there is no further declaration, so it cannot be understood as a limitation on the protection scope of the present application. The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self pressure relief assembly arranged in a pump body (100) having a water inlet (102) and a water outlet (101), characterized in that: A circulating cavity (103) is arranged between the water inlet (102) and the water outlet (101), and the circulating cavity (103) is communicated with the water outlet (101) through a pressure stabilizing port (1031) and communicated with the water inlet (102) through a pressure relief port (1032); The self-pressure relief assembly comprises a blocking member (1) and an elastic member (2), the blocking member (1) is arranged at the pressure stabilizing port (1031), and the elastic member (2) is arranged between the blocking member (1) and the inner wall of the circulating cavity (103); the elastic member (2) applies a force to the blocking member (1) so that the blocking member (1) blocks the pressure stabilizing port (1031).

2. The self-pressure relief assembly according to claim 1, characterized in that: The self-pressure relief assembly further comprises a pressure regulating assembly; one side of the circulating cavity (103) is provided with a mounting position, and the pressure regulating assembly is movably arranged in the mounting position; One end of the elastic member (2) abuts against the pressure stabilizing port (1031), and the other end abuts against the pressure regulating assembly; by moving the pressure regulating assembly, the compression amount of the elastic member (2) can be changed, so that the elastic pre-tightening force of the elastic member (2) is adjusted.

3. The self-pressure relief assembly according to claim 2, characterized in that: The pressure regulating assembly comprises a pressure regulating seat (3) and a sealing ring (31), the pressure regulating seat (3) is threadedly connected with the mounting position; one end of the elastic member (2) is clamped on a limiting column (33) arranged on the pressure regulating seat (3), and the sealing ring (31) is arranged on the pressure regulating seat (3) and the outer wall of the sealing ring (31) abuts against the inner wall of the mounting position.

4. The self-pressure relief assembly according to claim 2, characterized in that: One side of the pressure regulating assembly is provided with a control structure (32), the control structure (32) is exposed outside the circulating cavity (103), and the control structure (32) is used for controlling the movement of the pressure regulating assembly.

5. The self-pressure relief assembly according to any one of claims 1-4, characterized in that: A plurality of elastic members (2) are arranged on one side of the blocking member (1), and the plurality of elastic members (2) are uniformly distributed on the one side of the blocking member (2) along the circumferential direction of the elastic member (2).

6. The self-pressure relief assembly according to any one of claims 1-4, characterized in that: One side of the blocking member (1) which is connected with the pressure stabilizing port (1031) is provided with a flow guide surface, and the cross section of the flow guide surface gradually increases in the direction from the pressure stabilizing port (1031) to the elastic member (2).

7. A circulating water pump characterized by: The pump body (100) and the self-pressure relief assembly according to any one of claims 1-6 are comprised.

8. The circulating water pump according to claim 7, characterized in that: A flow guide structure is arranged in the circulating cavity (103), and the flow guide structure comprises a plurality of ribs (1033) arranged on the inner wall of the circulating cavity (103), and each rib (1033) is uniformly distributed on the inner wall of the circulating cavity (103) along the circumferential direction of the circulating cavity (103).

9. The circulating water pump according to claim 8, characterized in that: In the circulating cavity (103), the height of the convex ribs (1033) gradually increases in the direction from the pressure stabilizing port (1031) to the pressure relief port (1032).

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