A micro water pump with pressure relief structure

Abstract

The application relates to a micro water pump with a pressure relief structure, comprising a shell assembly and a pressurized delivery control assembly. The shell assembly is provided with an inlet pipe and an outlet pipe and is composed of an upper cover, a pressure relief seat and a pressurized seat in sequence. The pressure relief seat and the pressurized seat form an inlet cavity and an outlet cavity. The pressurized delivery control assembly cooperates with the pressurized seat to realize pressurized delivery from the inlet cavity to the outlet cavity. The pressure relief seat is provided with an inlet channel and an outlet channel, which are connected with the inlet cavity and the outlet cavity respectively. The upper cover and the pressure relief seat form a pressure relief cavity which is connected with the outlet channel. The pressure relief seat is provided with a pressure relief valve port which is connected with the inlet channel. The pressure relief cavity is provided with a pressure relief valve core and an elastic element. The elastic element keeps the valve core closed to block the valve port. When the water pressure in the pressure relief cavity exceeds a threshold value, the valve core is opened, water flows into the pressure relief cavity to reduce the pressure in the outlet channel, thereby avoiding overload and noise, and improving the sealing performance, stability and reliability.

Description

Technical Field

[0001] This application relates to a miniature water pump with a pressure relief structure. Background Technology

[0002] A miniature diaphragm pump is a miniature water pump with a diaphragm. It consists of a motor and a pump body. The pump body has two ports, one inlet and one outlet. Water enters from the inlet and exits from the outlet. It is also called a miniature water pump. The applicant disclosed a miniature diaphragm water pump in prior patent CN201821842763.7, comprising a top cover, a valve seat, and a water bladder frame connected in sequence. A water bladder is disposed between the water bladder frame and the valve seat. The valve seat and the top cover are connected to form an inlet chamber and an outlet chamber, while the valve seat and the water bladder are connected to form a drain chamber. The valve seat has an inlet hole connecting the drain chamber and the inlet chamber, and an outlet hole connecting the drain chamber and the outlet chamber. A first one-way valve is disposed at the outlet hole. A sealing wall is fitted to the end face of the valve seat that connects to the water bladder. A second one-way valve is disposed on the sealing wall corresponding to the inlet hole. The second one-way valve includes a through hole disposed on the sealing wall and a valve disc that forms a sealing fit with the inlet hole. One end of the valve disc is connected to the inner wall of the through hole, and the other end of the valve disc is oscillatingly disposed in the through hole. The applicant further discovered that the above-mentioned existing structure has a noise problem when applied. Further research by the applicant revealed that one of the main reasons for the noise problem is that when the pressure at the water outlet is high, the internal power mechanism pump needs to operate under overload, which leads to noise. Utility Model Content

[0003] To address the shortcomings of existing technologies, this application provides a miniature water pump with a pressure relief structure.

[0004] To achieve the above objectives, the technical solution of this application is as follows: a miniature water pump with a pressure relief structure, comprising a housing assembly and a pressure boosting and delivery control assembly; the housing assembly is provided with an inlet pipe and an outlet pipe; The housing assembly includes a top cover, a pressure relief seat, and a pressure boosting seat connected in sequence. The pressure relief seat and the pressure boosting seat are connected to form an inlet chamber and an outlet chamber. The pressure boosting and delivery control component cooperates with the pressure boosting seat to form a pressure boosting and delivery function from the inlet chamber to the outlet chamber. The pressure relief seat is provided with a water inlet channel and a water outlet channel. The water inlet channel connects the water inlet pipe and the water inlet chamber, and the water outlet channel connects the water outlet pipe and the water outlet chamber. The upper cover and the pressure relief seat are connected to form a pressure relief chamber that communicates with the water outlet channel. The pressure relief seat is provided with a pressure relief valve port, which is connected to the water inlet channel. The pressure relief chamber is provided with a pressure relief valve core that cooperates with the pressure relief valve port and an elastic element that acts on the pressure relief valve core to press against and block the pressure relief valve port. When the water pressure in the pressure relief chamber is greater than a certain threshold, the pressure relief valve core leaves the pressure relief valve port.

[0005] Preferably, a first elastic sealing element is provided between the upper cover and the pressure relief seat. The first elastic sealing element has a first sealing ring portion. The upper and lower ends of the first sealing ring portion abut against and seal with the upper cover and the pressure relief seat respectively, forming a pressure relief cavity in the inner circumferential area of ​​the first sealing ring portion.

[0006] Preferably, the sealing ring portion of the pressure relief seat that mates with the first elastic seal on the end face near the upper cover is provided with a first positioning annular groove, and the first elastic seal is provided with a first elastic protruding ring embedded in the first positioning annular groove.

[0007] Preferably, the first elastic seal is integrated with the pressure relief valve core, and the upper cover forms a movable cavity in the sealing ring portion that mates with the first elastic seal. The first elastic seal is connected to the pressure relief valve core via a deformable telescopic ring, allowing the pressure relief valve core to move axially within the movable cavity relative to the first elastic seal.

[0008] Preferably, the deformable telescopic ring is an upwardly convex and bent elastic diaphragm, and a recessed groove is formed between the sealing ring portion that cooperates with the first elastic seal and the pressure relief valve port on the end face of the pressure relief seat near the upper cover. The water inlet channel is provided with a pressure relief outlet located in the recessed groove.

[0009] Preferably, both the inlet pipe and the outlet pipe are located on the top cover; The pressure relief seat has a protrusion on the side near the upper cover, and the pressure relief valve port is located on the upper end face of the protrusion; The water outlet channel includes a first flow channel formed on the boss and arranged radially along the pressure relief valve port, a second flow channel and a third flow channel connected to the first flow channel near the upper cover and arranged axially along the pressure relief valve port, and a fourth flow channel connected to the first flow channel away from the upper cover and arranged axially along the pressure relief valve port. The end of the second flow channel is a first water outlet corresponding to the position of the water outlet pipe, and the end of the third flow channel is a pressure relief outlet. The water inlet channel includes a fifth flow channel formed on the boss and arranged radially along the pressure relief valve port, a sixth flow channel and a seventh flow channel connected to the fifth flow channel near the upper cover and arranged axially along the pressure relief valve port, and an eighth flow channel connected to the fifth flow channel away from the upper cover and arranged axially along the pressure relief valve port. The end of the sixth flow channel is a first water inlet interface corresponding to the position of the water inlet pipe, and the end of the seventh flow channel is a pressure relief valve port. The first flow channel and the fifth flow channel are respectively provided with openings on the outer peripheral surface of the boss; The upper cover is provided with a mating groove that matches the shape of the protrusion; The first elastic seal is provided with a bottom diaphragm that matches the shape of the upper end face of the boss, a side annular diaphragm that protrudes around the bottom diaphragm and has a height that matches the height of the boss, and an end face annular diaphragm that protrudes outward from the upper end of the side annular diaphragm. The bottom diaphragm is fixed between the upper end face of the boss and the bottom of the mating groove, the side annular diaphragm is fixed between the circumferential side wall of the boss and the circumferential inner wall of the mating groove, and the end face annular diaphragm is fixed between the end face of the pressure relief seat and the end face of the upper cover to form a sealing effect between the end face of the pressure relief seat and the end face of the upper cover.

[0010] Preferably, the bottom diaphragm is provided with a hollow second sealing ring and a hollow third sealing ring. The second sealing ring is provided corresponding to the first water inlet and the water inlet pipe, and its upper and lower ends are respectively abutting and sealing with the upper cover and the pressure relief seat. The third sealing ring is provided corresponding to the first water outlet and the water outlet pipe, and its upper and lower ends are respectively abutting and sealing with the upper cover and the pressure relief seat. The pressure relief seat is provided with a second annular rib and a third annular rib on the outer periphery of the first water inlet and the first water outlet on the end face near the upper cover. The second annular rib and the third annular rib are respectively embedded in the inner periphery of the second sealing ring and the third sealing ring. The upper cover is provided with the first sealing ring, the second sealing ring and the third sealing ring corresponding to the bottom diaphragm, and the upper abutting annular rib is provided on the third sealing ring.

[0011] Preferably, the elastic element is a tower-shaped spring, the upper cover is provided with a first limiting protrusion that matches the larger diameter end of the elastic element, and the larger diameter end of the elastic element is sleeved outside the first limiting protrusion and abuts against the upper cover, and the pressure relief valve core is provided with a second limiting protrusion that matches the smaller diameter end of the elastic element, and the smaller diameter end of the elastic element is sleeved outside the second limiting protrusion and abuts against the pressure relief valve core.

[0012] Preferably, the housing assembly includes a bottom shell connected to the booster seat, and a piston chamber is formed inside the bottom shell; The booster delivery control assembly includes a power unit, piston components, and a sealed check valve assembly; The piston component forms a piston inner cavity within the piston chamber that simultaneously connects the inlet chamber and the outlet chamber. The power component drives the piston component to cause the volume of the piston inner cavity to change alternately. The sealing check valve assembly includes an inlet check valve and an outlet check valve disposed on the booster seat. The inlet check valve is a one-way flow control valve from the inlet chamber to the piston inner chamber. The outlet check valve is a one-way flow control valve from the piston inner cavity to the outlet cavity.

[0013] Preferably, a second elastic seal is provided between the pressure boosting seat and the pressure relief seat; The piston assembly includes a third elastic seal and several piston bladders. The third elastic seal and several piston bladders are integrally connected and formed. The third elastic seal is disposed between the bottom shell and the pressure boosting seat. The piston bladders cooperate with the pressure boosting seat to form several piston cavities.

[0014] The beneficial effects of this application are as follows: By setting up a pressure relief structure, including a pressure relief chamber, a pressure relief valve port, a pressure relief valve core, and an elastic element, when the pressure in the water outlet channel is too high, it can push the pressure relief valve core to overcome the force of the elastic element, causing the pressure relief valve port to open, thereby releasing some water into the pressure relief chamber, thus reducing the pressure in the water outlet channel and preventing the internal power mechanism from operating under overload, effectively solving the noise problem existing in the prior art. At the same time, through a reasonable structural layout and sealing design, this application ensures the sealing performance and stability of the water pump, improving the pump's working efficiency and reliability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is an exploded view of an embodiment of the present utility model; Figure 3 This is a top view of an embodiment of the present utility model; Figure 4 This is a cross-sectional view of an embodiment of the present utility model, specifically... Figure 3 A cross-sectional view along the AA direction; Figure 5 for Figure 4 Enlarged diagram of part A in the middle; Figure 6 This is a schematic diagram of the pressure relief seat in an embodiment of the present invention; Figure 7 This is a cross-sectional view of the pressure relief seat in an embodiment of this utility model; Figure 8 This is a schematic diagram of the structure of the first elastic sealing element in an embodiment of this utility model; Figure 9 This is a cross-sectional view of the first elastic seal in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the upper cover in an embodiment of the present utility model; In the picture, Top cover-1, water inlet pipe-11, water outlet pipe-12, upper abutting annular convex rib-13, movable cavity-14, mating groove-15, first limiting protrusion-16; Pressure relief seat-2, water outlet channel-21, pressure relief outlet-211, first flow channel-212, second flow channel-213, third flow channel-214, fourth flow channel-215, first water outlet interface-216, third annular rib-2161, water inlet channel-22, fifth flow channel-221, sixth flow channel-222, seventh flow channel-223, eighth flow channel-224, first water inlet interface-225, second annular rib-2251, pressure relief valve port-23, first positioning annular groove-24, sinking groove-26, protrusion-27; Booster mount-3; First elastic seal - 4, pressure relief valve core - 41, second limiting protrusion - 411, telescopic ring - 42, first sealing ring part - 43, first elastic protrusion ring - 44, bottom diaphragm - 45, side annular diaphragm - 46, end annular diaphragm - 47, second sealing ring part - 48, third sealing ring part - 49. Elastic component -5; Bottom shell -6; Power Components-7; Piston component-8, third elastic seal-81, piston bladder-82; Inlet check valve-91, outlet check valve-92. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0023] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0024] This utility model provides a micro water pump with a pressure relief structure, which includes a housing assembly and a pressure boosting and delivery control assembly.

[0025] Among them, such as Figure 1 As shown, the housing assembly is composed of an upper cover 1, a pressure relief seat 2, a pressure boosting seat 3, and a bottom shell 6 connected in sequence. The housing assembly is provided with an inlet pipe 11 and an outlet pipe 12. The pressure boosting and delivery control assembly is used to form a pressure boosting pumping action from the inlet pipe 11 to the outlet pipe 12.

[0026] like Figure 2 , Figure 4 As shown, a piston chamber is formed inside the bottom shell 6. The pressurization and delivery control assembly cooperates with the bottom shell 6 and the pressurization seat 3 to form a pressurization and delivery function from the water inlet chamber to the water outlet chamber. Specifically, the pressurization and delivery control assembly includes a power assembly 7, a piston component 8, and a sealing check valve assembly. The piston assembly 8 includes a third elastic seal 81 and several piston bladders 82, which are integrally formed. The third elastic seal 81 is disposed between the bottom shell 6 and the pressure booster seat 3, forming a seal between them. The piston bladders 82 cooperate with the pressure booster seat 3 to form several piston cavities within the bottom shell 6. These cavities are simultaneously connected to the inlet pipe 11 and the outlet pipe 12. The sealing check valve assembly includes an inlet check valve 91 and an outlet check valve 92 disposed on the pressure booster seat 3. The inlet check valve 91 is a one-way flow control valve from the inlet pipe to the piston cavity, and the outlet check valve 92 is a one-way flow control valve from the piston cavity to the outlet pipe. The power assembly 7 drives the piston bladders 82 to alternately change the volume of the piston cavities. With the above structure, when the power assembly 7 is activated, a booster pumping action is formed from the inlet pipe 11 to the outlet pipe 12. The specific structure of the booster delivery control component is existing technology and is not an innovation of this application, so it will not be described in detail here.

[0027] To address the issues in the related technologies, this application embodiment adds a pressure relief seat 2 and a pressure relief control structure on the pressure relief seat 2. The pressure relief control structure is used for pressure relief control in the direction from the outlet pipe 12 to the inlet pipe 11. When the pressure at the outlet pipe 12 is higher than a certain value, the pressure relief control structure is activated, connecting the outlet pipe 12 to the inlet pipe 11. The fluid in the outlet pipe 12 is then transported towards the inlet pipe 11, thereby releasing the pressure in the outlet pipe 12 and achieving the purpose of noise reduction.

[0028] Specifically, such as Figures 4-10As shown, the pressure relief seat 2 and the pressure boosting seat 3 are connected to form a water inlet chamber and a water outlet chamber that are separated from each other. The pressure relief seat 2 is provided with a water inlet channel 22 and a water outlet channel 21. The water inlet channel 22 connects the water inlet pipe 11 and the water inlet chamber, and the water outlet channel 21 connects the water outlet pipe and the water outlet chamber. The upper cover 1 and the pressure relief seat 2 are connected to form a pressure relief chamber that communicates with the water outlet channel 21. The pressure relief seat 2 is provided with a pressure relief valve port 23, which communicates with the water inlet channel 22. The pressure relief chamber is provided with a pressure relief valve core 41 that cooperates with the pressure relief valve port 23 and an elastic element 5 that acts on the pressure relief valve core 41 to press against and block the pressure relief valve port 23. When the water pressure in the pressure relief chamber is greater than a certain threshold, the pressure relief valve core 41 leaves the pressure relief valve port 23. When the pressure inside the outlet chamber is too high, the water pressure overcomes the elastic force of the elastic element 5, pushing the pressure relief valve core 41 away from the pressure relief valve port 23. Water then flows out from the pressure relief chamber through the pressure relief valve port 23, achieving pressure relief protection and preventing damage to the water pump due to excessive pressure. This application, by setting a pressure relief structure, can automatically relieve pressure when the pressure at the water pump outlet is too high, solving the noise problem caused by high-load operation of the water pump.

[0029] Optionally, in some embodiments, a first elastic seal 4 is provided between the upper cover 1 and the pressure relief seat 2. The first elastic seal 4 has a first sealing ring portion 43, the upper and lower ends of which respectively abut and seal with the upper cover 1 and the pressure relief seat 2, forming a pressure relief cavity in the inner circumferential area of ​​the first sealing ring portion 43. The first elastic seal 4 is integrally molded from elastic materials such as rubber, and has good sealing and elasticity, which can ensure the sealing of the pressure relief cavity. At the same time, it undergoes elastic deformation under water pressure to realize the pressure relief function. The first sealing ring portion 43 of the first elastic seal 4 fits tightly with the upper cover 1 and the pressure relief seat 2 to form a reliable sealing structure, preventing water from leaking from the pressure relief cavity. At the same time, the elastic deformation capability of the first elastic seal 4 allows the pressure relief valve core 41 to open and close smoothly under water pressure, realizing the pressure relief function.

[0030] Optionally, in some embodiments, the sealing ring portion of the pressure relief seat 2 near the upper cover 1, which mates with the first elastic seal 4, is provided with a first positioning annular groove 24. The first elastic seal 4 is provided with a first elastic protruding ring 44 embedded in the first positioning annular groove 24. The mating design of the first positioning annular groove 24 and the first elastic protruding ring 44 can ensure the accurate installation and positioning of the first elastic seal 4 on the pressure relief seat 2, and prevent the first elastic seal 4 from shifting or falling off during use.

[0031] Optionally, in some embodiments, the first elastic seal 4 is integrally connected to the pressure relief valve core 41, and the upper cover 1 forms a movable cavity 14 within the sealing ring portion that mates with the first elastic seal 4; the first elastic seal 4 and the pressure relief valve core 41 are connected by a deformable telescopic ring 42, allowing the pressure relief valve core 41 to move axially relative to the first elastic seal 4 within the movable cavity 14. Further, by integrally connecting the first elastic seal 4 and the pressure relief valve core 41 and connecting them via the deformable telescopic ring 42, the pressure relief valve core 41 can move axially within the movable cavity 14, achieving flexible movement of the pressure relief valve core 41 while ensuring the sealing of the pressure relief cavity.

[0032] Optionally, in some embodiments, the deformable telescopic ring 42 is an upwardly convex and bent elastic diaphragm. A recessed groove 26 is formed between the sealing ring portion that cooperates with the first elastic seal 4 on the end face of the pressure relief seat 2 near the upper cover 1 and the pressure relief valve port 23. The water inlet channel 22 is provided with a pressure relief outlet 223 located in the recessed groove 26. Designing the deformable telescopic ring 42 as an upwardly convex and bent elastic diaphragm can increase the deformation of the telescopic ring 42 and improve the movement flexibility of the pressure relief valve core 41. At the same time, the pressure relief outlet 223 is provided in the recessed groove 26 to ensure that water can flow out smoothly during pressure relief, and to prevent the telescopic ring 42 from sticking to the pressure relief seat 2 and blocking the pressure relief outlet 223, thus affecting the normal pressure relief function.

[0033] Alternatively, in some embodiments, such as Figures 6-10As shown, both the inlet pipe 11 and the outlet pipe 12 are mounted on the upper cover 1; a protrusion 27 is formed on the side of the pressure relief seat 2 near the upper cover 1, and a pressure relief valve port 23 is disposed on the upper end face of the protrusion 27; the outlet channel 21 includes a first flow channel 212 formed on the protrusion 27 and arranged radially along the pressure relief valve port 23, a second flow channel 213 and a third flow channel 214 connected to the side of the first flow channel 212 near the upper cover 1 and arranged axially along the pressure relief valve port 23, and an outlet channel 214 connected to the side of the first flow channel 212 away from the upper cover 1 and arranged axially along the pressure relief valve port 23. A fourth flow passage 215 is arranged along the axial direction of the pressure relief valve port 23; the end of the second flow passage 213 is a first water outlet 216 corresponding to the position of the water outlet pipe 12; the end of the third flow passage 214 is a pressure relief outlet 211; the water inlet passage 22 includes a fifth flow passage 221 formed on the boss 27 and arranged radially along the pressure relief valve port 23; a sixth flow passage 222 and a seventh flow passage 223 connected to the fifth flow passage 221 near the upper cover 1 and arranged along the axial direction of the pressure relief valve port 23; and a connecting... An eighth flow channel 224 is located on the side of the fifth flow channel 221 away from the upper cover 1 and along the axial direction of the pressure relief valve port 23. The end of the sixth flow channel 222 is a first water inlet port 225 corresponding to the position of the water inlet pipe 11. The end of the seventh flow channel 223 is a pressure relief valve port 23. The first flow channel 212 and the fifth flow channel 221 are respectively provided with openings on the outer peripheral surface of the boss 27. The upper cover 1 is provided with a mating groove 15 that matches the shape of the boss 27. The first elastic seal is provided with a bottom diaphragm that matches the shape of the upper end face of the boss. 45. A side annular diaphragm 46 with a height adapted to the height of the boss 27, protruding around the bottom diaphragm 45; and an end face annular diaphragm 47 with an outward protrusion from the upper end of the side annular diaphragm 46. The bottom diaphragm 45 is fixed between the upper end face of the boss 27 and the bottom of the mating groove 15. The side annular diaphragm 46 is fixed between the circumferential side wall of the boss and the circumferential inner wall of the mating groove 15. The end face annular diaphragm 47 is fixed between the end face of the pressure relief seat 2 and the end face of the upper cover to form a sealing effect between the end face of the pressure relief seat 2 and the end face of the upper cover 1.

[0034] The elastic element 5 is preferably a tower-shaped spring, characterized by a larger diameter at one end and a smaller diameter at the other. This design is beneficial for providing stability during compression within a limited space. The upper cover 1 has a first limiting protrusion 16, the diameter of which matches the internal dimensions of the larger diameter end of the tower-shaped spring. During installation, the larger diameter end of the tower-shaped spring is fitted over the first limiting protrusion 16, its end face abutting against the corresponding support surface of the upper cover 1, preventing radial displacement of the spring during compression. The lower end of the pressure relief valve core 41 has a second limiting protrusion 411, the diameter of which matches the internal dimensions of the smaller diameter end of the tower-shaped spring. The smaller diameter end of the tower-shaped spring is fitted over the second limiting protrusion 411, its end face abutting against the corresponding support surface of the pressure relief valve core 41. This double-end limiting structure ensures that the tower-shaped spring remains on a predetermined trajectory during repeated compression and rebound, preventing skewing and jamming, thereby ensuring that the pressure relief valve core 41 can respond sensitively and reliably open or close the pressure relief valve port 23.

Claims

1. A miniature water pump with a pressure relief structure, comprising a housing assembly and a pressure boosting and delivery control assembly; the housing assembly is provided with an inlet pipe (11) and an outlet pipe (12). Its features are, The housing assembly includes a top cover (1), a pressure relief seat (2), and a pressure boosting seat (3) connected in sequence. The pressure relief seat (2) and the pressure boosting seat (3) are connected to form an inlet chamber and an outlet chamber. The pressure boosting and conveying control component cooperates with the pressure boosting seat (3) to form a pressure boosting and conveying function from the inlet chamber to the outlet chamber. The pressure relief seat (2) is provided with an inlet channel (22) and an outlet channel (21). The inlet channel (22) connects the inlet pipe (11) and the inlet chamber, and the outlet channel (21) connects the outlet pipe (12) and the outlet chamber. The upper cover (1) and the pressure relief seat (2) are connected to form a pressure relief chamber that communicates with the water outlet channel (21). The pressure relief seat (2) is provided with a pressure relief valve port (23). The pressure relief valve port (23) is connected to the water inlet channel (22). The pressure relief chamber is provided with a pressure relief valve core (41) that cooperates with the pressure relief valve port (23) and an elastic element (5) that acts on the pressure relief valve core (41) to press against and block the pressure relief valve port (23). When the water pressure in the pressure relief chamber is greater than a certain threshold, the pressure relief valve core (41) leaves the pressure relief valve port (23).

2. The miniature water pump with a pressure relief structure according to claim 1, characterized in that: A first elastic seal (4) is provided between the upper cover (1) and the pressure relief seat (2). The first elastic seal (4) is provided with a first sealing ring (43). The upper and lower ends of the first sealing ring (43) are respectively in contact with the upper cover (1) and the pressure relief seat (2) to form a pressure relief cavity in the inner circumferential area of ​​the first sealing ring (43).

3. The miniature water pump with a pressure relief structure according to claim 2, characterized in that: The pressure relief seat (2) has a first positioning annular groove (24) on the sealing ring part that cooperates with the first elastic seal (4) on the end face near the top cover (1). The first elastic seal (4) has a first elastic protruding ring (44) embedded in the first positioning annular groove (24).

4. The miniature water pump with a pressure relief structure according to claim 2, characterized in that: The first elastic seal (4) is connected to the pressure relief valve core (41) as a whole, and the upper cover (1) forms a movable cavity (14) in the sealing ring part that cooperates with the first elastic seal (4). The first elastic seal (4) is connected to the pressure relief valve core (41) by a deformable telescopic ring (42), so that the pressure relief valve core (41) can move axially relative to the first elastic seal (4) in the movable cavity (14).

5. The miniature water pump with a pressure relief structure according to claim 4, characterized in that: The deformable telescopic ring (42) is an elastic diaphragm that bulges upward. The sealing ring part of the pressure relief seat (2) that cooperates with the first elastic seal (4) on the end face near the top cover (1) forms a sinking groove (26) between the pressure relief valve port (23) and the pressure relief seat (2). The water inlet channel (22) is provided with a pressure relief outlet (211) located in the sinking groove (26).

6. The miniature water pump with a pressure relief structure according to any one of claims 2-5, characterized in that: The inlet pipe (11) and outlet pipe (12) are both installed on the upper cover (1); The pressure relief seat (2) has a protrusion (27) formed on the side near the upper cover (1), and the pressure relief valve port (23) is provided on the upper end face of the protrusion (27); The water outlet channel (21) includes a first flow channel (212) formed on the boss (27) and arranged radially along the pressure relief valve port (23), a second flow channel (213) and a third flow channel (214) connected to the side of the first flow channel (212) near the top cover (1) and arranged axially along the pressure relief valve port (23), and a fourth flow channel (215) connected to the side of the first flow channel (212) away from the top cover (1) and arranged axially along the pressure relief valve port (23). The end of the second flow channel (213) is a first water outlet interface (216) corresponding to the position of the water outlet pipe (12), and the end of the third flow channel (214) is a pressure relief outlet (211). The water inlet channel (22) includes a fifth flow channel (221) formed on the boss (27) and arranged radially along the pressure relief valve port (23), a sixth flow channel (222) and a seventh flow channel (223) connected to the side of the fifth flow channel (221) near the top cover (1) and arranged axially along the pressure relief valve port (23), and an eighth flow channel (224) connected to the side of the fifth flow channel (221) away from the top cover (1) and arranged axially along the pressure relief valve port (23). The end of the sixth flow channel (222) is a first water inlet interface (225) corresponding to the position of the water inlet pipe (11), and the end of the seventh flow channel (223) is a pressure relief valve port (23). The first flow channel (212) and the fifth flow channel (221) are respectively provided with openings on the outer peripheral surface of the boss (27); The upper cover (1) is provided with a mating groove (15) that matches the shape of the protrusion (27); The first elastic seal (4) is provided with a bottom diaphragm (45) that is adapted to the shape of the upper end face of the boss (27), a side annular diaphragm (46) that is circumferentially raised along the bottom diaphragm (45) and has a height adapted to the height of the boss (27), and an end face annular diaphragm (47) that is circumferentially raised along the upper end of the side annular diaphragm (46). The bottom diaphragm (45) is fixed between the upper end face of the boss (27) and the bottom of the mating groove (15). The side annular diaphragm (46) is fixed between the circumferential side wall of the boss (27) and the circumferential inner wall of the mating groove (15). The end face annular diaphragm (47) is fixed between the end face of the pressure relief seat (2) and the end face of the upper cover (1) to form a sealing effect between the end face of the pressure relief seat (2) and the end face of the upper cover (1).

7. The miniature water pump with a pressure relief structure according to claim 6, characterized in that: The bottom diaphragm (45) is provided with a hollow second sealing ring (48) and a hollow third sealing ring (49). The second sealing ring (48) is provided corresponding to the first water inlet (225) and the water inlet pipe (11), and its upper and lower ends are respectively abutting and sealing with the upper cover (1) and the pressure relief seat (2). The third sealing ring (49) is provided corresponding to the first water outlet (216) and the water outlet pipe (12), and its upper and lower ends are respectively abutting and sealing with the upper cover (1) and the pressure relief seat (2). The pressure relief seat (2) is close to the upper cover. (1) A second annular rib (2251) and a third annular rib (2161) are respectively provided on the outer periphery of the first water inlet (225) and the first water outlet (216). The second annular rib (2251) and the third annular rib (2161) are respectively embedded in the inner periphery of the second sealing ring (48) and the third sealing ring (49). The upper cover (1) is provided with a first sealing ring (43), a second sealing ring (48) and a third sealing ring (49) with an upper abutting annular rib (13) corresponding to the bottom diaphragm (45).

8. The miniature water pump with a pressure relief structure according to claim 1, characterized in that: The elastic element (5) is a tower-shaped spring. The upper cover (1) is provided with a first limiting protrusion (16) that is adapted to the larger diameter end of the elastic element (5). The larger diameter end of the elastic element (5) is sleeved on the first limiting protrusion (16) and abuts against the upper cover (1). The pressure relief valve core (41) is provided with a second limiting protrusion (411) that is adapted to the smaller diameter end of the elastic element (5). The smaller diameter end of the elastic element (5) is sleeved on the second limiting protrusion (411) and abuts against the pressure relief valve core (41).

9. The miniature water pump with a pressure relief structure according to claim 1, characterized in that: The housing assembly includes a bottom shell (6), which is connected to the booster seat (3), and a piston chamber is formed inside the bottom shell (6); The booster delivery control assembly includes a power assembly (7), a piston assembly (8), and a sealed check valve assembly; The piston component (8) forms a piston inner cavity that simultaneously connects the water inlet cavity and the water outlet cavity within the piston chamber. The power component (7) drives the piston component (8) to alternating the size of the piston inner cavity. The sealing check valve assembly includes an inlet check valve (91) and an outlet check valve (92) disposed on the booster seat (3). The inlet check valve (91) is a one-way flow control valve from the inlet chamber to the piston inner chamber. The outlet check valve is a one-way flow control valve from the piston inner cavity to the outlet cavity.

10. The miniature water pump with a pressure relief structure according to claim 9, characterized in that: A second elastic seal is provided between the pressure boosting seat (3) and the pressure relief seat (2); The piston component (8) includes a third elastic seal (81) and a plurality of piston bladders (82). The third elastic seal (81) and the plurality of piston bladders (82) are integrally connected and formed. The third elastic seal (81) is disposed between the bottom shell (6) and the pressure booster seat (3). The piston bladders (82) cooperate with the pressure booster seat (3) to form a plurality of piston cavities.

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