Miniature liquid pump capable of relieving pressure
By designing a pressure relief channel and a pressure relief valve core assembly in the micro liquid pump, the problem of micro liquid pump bursting and leaking under high pressure was solved, achieving stable pressure control and structural optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-14
- Publication Date
- 2026-04-07
AI Technical Summary
Existing micro liquid pumps are prone to bursting and leaking under high pressure, making it impossible to effectively control the pressure and resulting in low application pressure for the products.
A pressure-relief micro liquid pump was designed. By setting a pressure relief channel between the water outlet chamber and the water inlet chamber, the pressure relief valve core assembly automatically opens when the pressure exceeds a certain value to achieve pressure balance. The assembly includes components such as a pressure relief cover, a sealing plug, and a compression spring to form a pressure relief channel.
It effectively controls the outlet water pressure, prevents leakage caused by overload pressure, optimizes structural space and cost, and achieves stable control of outlet water pressure.
Smart Images
Figure CN121803448A_ABST
Abstract
Description
Technical Field
[0001] This invention specifically relates to a pressure-relief micro liquid pump. Background Technology
[0002] Currently, miniature liquid pumps on the market have relatively high inherent pressure, but the actual application pressure is relatively low. When the entire machine is malfunctioning, excessive pressure can lead to phenomena such as cracking and leakage. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a pressure-relief micro liquid pump.
[0004] The technical solution adopted in this invention is as follows: A pressure-relief micro liquid pump, comprising: The pump body includes an upper cover, a one-way diaphragm seat, and a piston fixing seat connected in sequence. An inlet chamber and an outlet chamber are formed between the upper cover and the one-way diaphragm seat. A power chamber is formed between the one-way diaphragm seat and the piston fixing seat. A piston is provided in the power chamber. The one-way diaphragm seat is provided with an inlet hole communicating with the inlet chamber and the power chamber, and an outlet hole communicating with the outlet chamber and the power chamber. A one-way valve plate for water inlet, which is disposed on the one-way diaphragm seat and is used to control the opening and closing of the water inlet hole; A one-way valve plate for water outlet, which is disposed on the one-way diaphragm seat and is used to control the opening and closing of the water outlet hole; The upper cover is connected to a pressure relief cover at its outer end, and a pressure relief cavity is formed between the upper cover and the pressure relief cover. The upper cover is provided with a first through hole connecting the water outlet cavity and the pressure relief cavity, and a second through hole connecting the pressure relief cavity and the water inlet cavity. The first through hole, the pressure relief cavity, and the second through hole are connected in sequence to form a pressure relief channel. It also includes a pressure relief valve core assembly, which cooperates with the upper cover to have a normal state in which the pressure relief channel is closed by blocking the first or second through hole, and a pressure relief state in which the pressure relief channel is opened when the hydraulic pressure in the outlet chamber is greater than the hydraulic pressure in the inlet chamber by a certain value.
[0005] The pressure relief valve core assembly includes a sealing plug and a compression spring. The sealing plug cooperates with a first through hole or a second through hole, and the compression spring acts on the sealing plug to block the first through hole or the second through hole.
[0006] The sealing plug and compression spring are disposed in the water inlet chamber. Under normal conditions, the sealing plug blocks the second through hole, and the compression spring is compressed between the sealing plug and the one-way diaphragm seat.
[0007] The inner side of the upper cover is provided with a first convex ring, and the inner wall of the first convex ring is provided with a plurality of limiting blocks. The sealing plug is disposed between the plurality of limiting blocks and is limited by the limiting effect of the limiting blocks so that it can only slide up and down.
[0008] The sealing plug is provided with a first spring limiting post, the one-way diaphragm seat is provided with a second spring limiting post, and the two ends of the compression spring are respectively sleeved on the first spring limiting post and the second spring limiting post.
[0009] A sealing ring is provided between the upper cover and the pressure relief cover. The upper cover has a first groove that matches the outer circumference of the sealing ring. The pressure relief cover has a second annular groove that matches the shape of the sealing ring. The sealing ring is embedded in the second annular groove and also in the first groove. The first through hole and the second through hole are located inside the sealing ring.
[0010] The sealing ring has raised rings on both ends.
[0011] The upper cover has several countersunk holes outside the first groove, and the pressure relief cover has several corresponding through holes. The pressure relief cover is connected and fixed by a first fastening threaded component.
[0012] The beneficial effects of the present invention are as follows: The present invention forms a pressure relief channel between the water outlet chamber and the water inlet chamber by adding a pressure relief cover. When the pressure value in the water outlet chamber exceeds a certain value, the pressure relief channel opens, and the liquid flows back into the water inlet chamber through the water outlet chamber, so that the pressure values in the water inlet and outlet chambers reach a balance, thereby achieving the requirement of water outlet pressure control. The integrated design of the structure optimizes the structural space and cost. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.
[0014] Figure 1 This is a perspective view of one embodiment of the present invention; Figure 2 This is an exploded view of one embodiment of the present invention; Figure 3 This is a bottom view of one embodiment of the present invention; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 for Figure 3 Cross-sectional view along the BB direction; Figure 6 for Figure 5 Enlarged diagram of part A in the middle; Figure 7 This is a schematic diagram of the structure of the upper cover at one angle in one embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a unidirectional membrane seat in one embodiment of the present invention; Figure 9 This is a schematic diagram of the upper cover from another angle in one embodiment of the present invention; Figure 10 This is a schematic diagram of the pressure relief cover in one embodiment of the present invention; Figure 11 This is a schematic diagram of the sealing ring structure in one embodiment of the present invention; In the diagram, motor-1, motor mounting base-2, machine thread screw-3, eccentric wheel-4, shaft-5, turntable-6, piston mounting base-7, piston-8, inlet check valve-9, check diaphragm seat-10, inlet hole-1001, outlet hole-1002, second spring limit post-1003, outlet check valve-11, compression spring-12, sealing plug-13, first spring limit post-1301, and top cover-1 4. Water inlet pipe - 1401, water outlet pipe - 1402, first through hole - 1403, second through hole - 1404, first convex ring - 1405, limiting block - 1406, first groove - 1407, countersunk hole - 1408, sealing ring - 15, convex ring - 1501, pressure relief cover - 16, second annular groove - 1601, through hole - 1602, first fastening threaded part - 17, second fastening threaded part - 18. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.
[0016] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.
[0017] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.
[0018] A pressure-relief miniature liquid pump, such as Figure 1-4 As shown, it includes: The pump body includes an upper cover 14, a one-way diaphragm seat 10, and a piston fixing seat 7 connected in sequence. An inlet chamber and an outlet chamber are formed between the upper cover 14 and the one-way diaphragm seat 10. The upper cover 14 is provided with an inlet pipe 1401 and an outlet pipe 1402 corresponding to the inlet chamber and the outlet chamber, respectively. A power chamber is formed between the one-way diaphragm seat 10 and the piston fixing seat 7. The one-way diaphragm seat 10 is provided with an inlet hole 1001 connecting the inlet chamber and the power chamber, and an outlet hole 1002 connecting the outlet chamber and the power chamber. The motor assembly includes a motor 1, a motor mounting base 2, and an eccentric wheel 4. The motor mounting base 2 is mounted on the motor 1 and is fixed to the motor 1 by a threaded connection of a machine screw 3. The motor mounting base 2 is connected to a piston mounting base 7. The eccentric wheel 4 is disposed in the power chamber and its axial center hole is inserted into the front output shaft of the motor 1. The piston assembly includes a shaft 5, a turntable 6, a piston mounting base 7, and a piston 8. One end of the shaft 5 is connected to an eccentric wheel 4, and the other end is pressed into the central shaft hole of the turntable 6. The bladder of the piston 8 is assembled and fitted into the corresponding hole of the piston mounting base 7. The turntable 6 is fixedly connected to the piston 8. The function of the shaft 9 is to provide a rotational transmission connection for the kinetic energy transmission of the piston's reciprocating motion driven by the rotation of the motor. The piston 8 moves up and down through the rotation of the turntable 6, thereby driving the reciprocating motion of the piston, which causes the fluid to enter and exit. A one-way valve plate 9 is provided on the one-way diaphragm seat 10 to control the opening and closing of the water inlet hole 1001; One-way valve plate 11 is provided on the one-way diaphragm seat 10 to control the opening and closing of the water outlet 1002; Specifically, during the reciprocating motion of the piston, the inlet hole 1001 is open while the outlet hole 1002 is closed, and the inlet hole 1001 is closed while the outlet hole 1002 is open, so that the fluid is drawn from the inlet chamber into the power chamber and then pressed from the power chamber into the outlet chamber.
[0019] Through the reciprocating motion of the piston, the hydraulic pressure in the inlet chamber is pressurized and enters the outlet chamber. If the motor speed is too fast, the pressure in the outlet chamber may be too high, leading to leakage. This embodiment is designed to solve the pressure overload problem and effectively solve the high pressure control problem of the system. When the set pressure is exceeded, the pressure can be released in a timely and effective manner to achieve pressure control.
[0020] Specifically, as shown in the figure Figure 3 , Figure 4 As shown, the outer end of the upper cover 14 is connected to a pressure relief cover 16, and a pressure relief cavity is formed between the upper cover 14 and the pressure relief cover 16. The upper cover 14 is provided with a first through hole 1403 connecting the water outlet cavity and the pressure relief cavity, and a second through hole 1404 connecting the pressure relief cavity and the water inlet cavity. The first through hole 1403, the pressure relief cavity, and the second through hole 1404 are connected in sequence to form a pressure relief channel. It also includes a pressure relief valve core assembly, which cooperates with the upper cover 14 to have a normal state in which the pressure relief channel is closed by blocking the first through hole 1403 or the second through hole 1404, and a pressure relief state in which the pressure relief channel is opened when the hydraulic pressure in the outlet chamber is greater than the hydraulic pressure in the inlet chamber by a certain value.
[0021] Furthermore, such as Figure 6 As shown, the pressure relief valve core assembly includes a sealing plug 13 and a compression spring 12. The sealing plug 13 cooperates with either the first through hole 1403 or the second through hole 1404. The compression spring 12 acts on the sealing plug 13 to block the first through hole 1403 or the second through hole 1404. The pressure relief pressure of the outlet chamber can be adjusted by adjusting the elastic force of the compression spring.
[0022] Furthermore, the sealing plug 13 and the compression spring 12 are disposed in the water inlet chamber. Under normal conditions, the sealing plug 13 blocks the second through hole 1404, and the compression spring 12 is compressed and disposed between the sealing plug 13 and the one-way diaphragm seat 10. The space is compact, and the overall volume is not significantly increased.
[0023] Furthermore, such as Figure 7 As shown, the inner side of the upper cover 14 is provided with a first protruding ring 1405, and the inner wall of the first protruding ring 1405 is provided with a plurality of limiting blocks 1406. The sealing plug 13 is disposed between the plurality of limiting blocks 1406 and is limited by the limiting effect of the limiting blocks 1406 so that it can only slide up and down.
[0024] Furthermore, such as Figure 6 As shown, the sealing plug 13 is provided with a first spring limiting post 1301, the one-way diaphragm seat 10 is provided with a second spring limiting post 1003, and the two ends of the compression spring 12 are respectively sleeved on the first spring limiting post 1301 and the second spring limiting post 1003.
[0025] A sealing ring 15 is provided between the upper cover 14 and the pressure relief cover 16, such as Figure 9 As shown, the upper cover 14 is provided with a first groove 1407 that matches the shape of the outer periphery of the sealing ring 15, such as... Figure 10 As shown, the pressure relief cover 16 is provided with a second annular groove 1601 that is adapted to the shape of the sealing ring 15. The sealing ring 15 is embedded in the second annular groove 1601 and in the first groove 1407. The first through hole 1403 and the second through hole 1404 are provided inside the sealing ring 15.
[0026] like Figure 11 As shown, both ends of the sealing ring 15 are provided with raised rings 1501. The raised rings 1501 can improve the sealing effect of the sealing ring 15.
[0027] like Figure 9As shown, the upper cover 14 has several countersunk holes 1408 outside the first groove 1407, and the pressure relief cover 16 has several through holes 1602 correspondingly. The pressure relief cover 16 is connected and fixed by a first fastening threaded component 17. The first fastening threaded component 17 is a self-tapping screw.
[0028] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.
Claims
1. A pressure-relief miniature liquid pump, comprising: The pump body includes an upper cover (14), a one-way diaphragm seat (10), and a piston fixing seat (7) connected in sequence. An inlet chamber and an outlet chamber are formed between the upper cover (14) and the one-way diaphragm seat (10). A power chamber is formed between the one-way diaphragm seat (10) and the piston fixing seat (7). A piston (8) is provided in the power chamber. The one-way diaphragm seat (10) is provided with an inlet hole (1001) connecting the inlet chamber and the power chamber, and an outlet hole (1002) connecting the outlet chamber and the power chamber. One-way valve plate (9) for water inlet, which is disposed on the one-way diaphragm seat (10) for controlling the opening and closing of the water inlet hole (1001); One-way valve plate (11) for water outlet, which is disposed on the one-way diaphragm seat (10) for controlling the opening and closing of the water outlet (1002); The feature is that: a pressure relief cover (16) is connected to the outer end of the upper cover (14), a pressure relief cavity is formed between the upper cover (14) and the pressure relief cover (16), and the upper cover (14) is provided with a first through hole (1403) connecting the water outlet cavity and the pressure relief cavity, and a second through hole (1404) connecting the pressure relief cavity and the water inlet cavity. The first through hole (1403), the pressure relief cavity, and the second through hole (1404) are connected in sequence to form a pressure relief channel; It also includes a pressure relief valve core assembly, which cooperates with the upper cover (14) to have a normal state in which the pressure relief channel is closed by blocking the first through hole (1403) or the second through hole (1404) and a pressure relief state in which the pressure relief channel is opened when the hydraulic pressure in the outlet chamber is greater than the hydraulic pressure in the inlet chamber by a certain value.
2. The pressure-relief micro liquid pump according to claim 1, characterized in that: The pressure relief valve core assembly includes a sealing plug (13) and a compression spring (12). The sealing plug (13) cooperates with a first through hole (1403) or a second through hole (1404). The compression spring (12) acts on the sealing plug (13) to block the first through hole (1403) or the second through hole (1404).
3. The pressure-relief micro liquid pump according to claim 2, characterized in that: The sealing plug (13) and compression spring (12) are disposed in the water inlet chamber. Under normal conditions, the sealing plug (13) blocks the second through hole (1404), and the compression spring (12) is compressed between the sealing plug (13) and the one-way membrane seat (10).
4. The pressure-relief micro liquid pump according to claim 3, characterized in that: The inner side of the upper cover (14) is provided with a first protruding ring (1405), and the inner wall of the first protruding ring (1405) is provided with a plurality of limiting blocks (1406). The sealing plug (13) is disposed between the plurality of limiting blocks (1406) and is limited by the limiting effect of the limiting blocks (1406) so that it can only slide up and down.
5. The pressure-relief micro liquid pump according to claim 4, characterized in that: The sealing plug (13) is provided with a first spring limiting post (1301), the one-way diaphragm seat (10) is provided with a second spring limiting post (1003), and the two ends of the compression spring (12) are respectively sleeved outside the first spring limiting post (1301) and the second spring limiting post (1003).
6. The depressurizable micro liquid pump according to any one of claims 1-5, characterized in that: A sealing ring (15) is provided between the upper cover (14) and the pressure relief cover (16). The upper cover (14) is provided with a first groove (1407) that matches the outer circumference of the sealing ring (15). The pressure relief cover (16) is provided with a second annular groove (1601) that matches the shape of the sealing ring (15). The sealing ring (15) is embedded in the second annular groove (1601) and in the first groove (1407). The first through hole (1403) and the second through hole (1404) are located inside the sealing ring (15).
7. The pressure-relief micro liquid pump according to claim 6, characterized in that: The sealing ring (15) has a raised ring (1501) on both ends.
8. The pressure-relief micro liquid pump according to claim 6, characterized in that: The upper cover (14) has several countersunk holes (1408) outside the first groove (1407), and the pressure relief cover (16) has several through holes (1602) corresponding to it. The pressure relief cover (16) is connected and fixed by the first fastening threaded part (17).