Self-bleed fluid pump

Abstract

The application relates to a self-pressure-releasing fluid pump, relates to the technical field of fluid delivery, and comprises a power piece, a bearing piece, a pump head working with a pump valve, wherein the valve plate in the pump head simultaneously has pump operation dynamic sealing and valve operation dynamic sealing, and synchronously forms a pump working loop and a valve working loop; the pump head comprises a valve seat, a valve plate and a pump cover, constitutes a flow cavity and a control cavity of the pump working loop and the valve working loop, pumps out gas through a gas outlet nozzle on the pump cover, and realizes pressure release through a pressure release port on the pump cover; through operation design of the power piece and a gas pressure difference, the valve is closed when the pump is operated, the pump function is embodied, the valve is opened when the pump is closed, and the valve function is embodied; the self-pressure-releasing fluid pump is integrated with double functions, greatly reduces components in gas path operation, reduces material cost, reduces volume, and improves efficiency.

Description

Technical Field

[0001] This application relates to the field of fluid transport, and in particular to a self-relief fluid pump. Background Technology

[0002] In the field of fluid transport technology, fluid pumps, as core equipment, play a crucial role in numerous industries. From early simple liquid transport to today's complex gas and liquid mixture transport, fluid pump technology has continuously evolved. Its applications are wide-ranging, covering multiple fields such as medical equipment and household appliances. For example, in the medical field, devices like blood pressure monitors require precise inflation and deflation of the working bladder.

[0003] In existing self-relief fluid pump technology, in some application scenarios that require inflation and depressurization of a sealed working chamber, the relevant technical means often integrate a pressure relief valve on the fluid pump. The common flow path design is to simultaneously complete three tasks on a single flow path: pumping fluid into the sealed space, pumping fluid into the valve in the forward direction to block the pressure relief port, and pumping fluid in the reverse direction to open the pressure relief port after the pump is powered off.

[0004] However, existing self-relief fluid pump technologies generally suffer from poor stability in the closure of the pressure relief port during inflation. When multiple operations are performed simultaneously on a single flow path, the fluid can flow in the forward direction of the valve, and it can also affect the valve's reverse pressure relief opening. This is because the valve's opening and closing depends entirely on the pressure difference between the fluids acting on it in the forward and reverse directions within the same flow path, and this pressure difference is difficult to stabilize, thus affecting the inflation stability of the self-relief fluid pump. Summary of the Invention

[0005] In order to effectively improve inflation stability, the purpose of this application is to provide a self-relieving fluid pump.

[0006] The self-relief fluid pump provided in this application adopts the following technical solution: A self-relief fluid pump, comprising: Power components, used to transmit electricity to generate driving force; A load-bearing component, used to receive the driving force generated by the power component for fluid transport; The pump head serves as both a dynamic seal for pump operation and a dynamic seal for valve operation, simultaneously forming the pump working circuit and the valve working circuit. The pump head receives the fluid transported by the carrier and allows unidirectional flow. The pump head includes a valve seat, a valve plate, and a pump cover. The valve seat is connected to the carrier, the pump cover is installed on the valve seat, and the valve plate is sandwiched between the valve seat and the pump cover. The valve seat has a fluid inlet chamber, a fluid flow chamber, and a leak-proof control chamber. The fluid inlet chamber receives fluid from the carrier. The valve plate has a flow chamber and a control relief chamber that cooperate to form the pump working circuit and the valve working circuit. The flow chamber is equipped with an inlet valve that restricts the fluid from entering the chamber and opens and closes in one direction. The control relief chamber is equipped with a pressure relief valve for controlling the opening and closing of the pressure relief function. The pump cover has an interconnected pressure relief chamber and a discharge chamber. The pump cover has a discharge port connecting the discharge chamber and a pressure relief port connecting the pressure relief chamber. The fluid flow path length from the flow chamber to the discharge port is greater than the fluid flow path length from the flow chamber to the pressure relief port through the control relief chamber. The discharge chamber is connected to the control relief chamber of the valve plate through the flow chamber of the valve plate. The pressure relief valve of the valve plate completely separates the pressure relief chamber from the leak-proof control chamber of the valve seat. A pressure relief pipe is installed in the pressure relief chamber, and the pressure relief port is the opening of the pressure relief pipe. The pressure relief valve of the valve plate opens and closes the pressure relief port of the pressure relief pipe. The depth of the pressure relief chamber is greater than the depth of the leak-proof control chamber, and the depth of the pressure relief chamber is greater than the depth of the control relief chamber.

[0007] By adopting the above technical solution, the power component is energized to generate driving force, thereby driving the carrier component to rotate and transport fluid to the pump head. At this time, the fluid first enters from the fluid inlet chamber of the valve seat and pushes the inlet valve of the valve plate to open in one direction, thus entering the flow chamber of the valve plate. When charging, the pump working circuit works; when depressurizing, the valve working circuit works. This self-relief fluid pump can pump out gas through the vent on the pump cover and achieve pressure relief through the pressure relief port on the pump cover; through the calculation design of the power component and the air pressure difference, the valve is closed when the pump is running, realizing the pump function, and the valve is open when the pump is shut down, realizing the valve function; this self-relief fluid pump integrates dual functions, greatly reducing the number of components in the air circuit, reducing material costs, reducing size, and improving efficiency.

[0008] Specifically, the fluid entering the flow chamber is divided into two parts. Since the fluid flow path from the flow chamber to the drain port is longer than the fluid flow path from the flow chamber to the control chamber on the pressure relief port side, one part of the fluid entering the pressure relief chamber will first reach the control chamber of the valve plate, thereby pushing the pressure relief valve of the valve plate to deform and close the pressure relief port of the pressure relief pipe, thus shutting down the pressure relief function of the self-relieving fluid pump. The other part of the fluid flows through the drain chamber to the drain port, which is connected to an air bag or other object that needs to be inflated. Since the drain port is farther from the fluid inlet chamber than the pressure relief port, when the power component continuously outputs drive, the pressure in the control chamber on the pressure relief port side remains stable and greater than that of the drain port, so that the pressure relief valve remains closed. At this time, the self-relieving fluid pump only retains the inflation function.

[0009] When the power component is de-energized and stops outputting driving force, the starting point for conveying fluid changes from the carrier to the air bag connected to the drain port. At this time, the pressure relief chamber of the pump cover in the flow path is closer to the drain port than the control relief chamber of the valve plate. Therefore, the pressure in the pressure relief chamber is greater than the pressure in the control relief chamber. The pressure in the pressure relief chamber pushes the pressure relief valve of the valve plate away from the pressure relief port, the pressure relief port opens, and the self-relief fluid pump resumes its pressure relief function.

[0010] It should be noted that this application effectively improves the stability of the pressure relief port closure when the self-relief fluid pump is working in the pump working circuit by designing the length of the flow path inside the pump head, especially the length of the fluid flow path from the flow cavity to the discharge port and from the flow cavity to the pressure relief port.

[0011] Optionally, the drainage chamber includes an inlet region, a controlled-release pressure transformation region, and a controlled-release flow passage region, with the fluid passage area of ​​the controlled-release pressure transformation region increasing along the direction closer to the controlled-release flow passage region.

[0012] By adopting the above technical solution, the fluid passage area of ​​the controlled-release pressure-transformer zone increases along the direction closer to the controlled-release flow area. This reduces the flow velocity and pressure of the fluid entering the controlled-release flow area from the inlet zone. The pressure difference further reduces the resistance of the fluid entering the valve plate's controlled-release chamber, making it easier for the pressure relief valve to close the pressure relief port. Conversely, the fluid passage area of ​​the controlled-release pressure-transformer zone decreases along the direction away from the controlled-release flow area. When the fluid in the valve plate's controlled-release chamber wants to flow through the controlled-release flow area and the controlled-release pressure-transformer zone, it will generate pressure resistance. Therefore, by reducing the difficulty of closing the pressure relief port and increasing the difficulty of opening the pressure relief port, the charging stability of the self-relieving fluid pump is further improved.

[0013] Optionally, the drainage chamber may also include a drainage transformation zone and a drainage flow path zone, wherein the fluid flow area of ​​the drainage transformation zone increases along the direction closer to the drainage flow path zone.

[0014] By adopting the above technical solution, the fluid flow area in the drainage transformation zone increases along the direction closer to the drainage flow path, thereby reducing the flow velocity and pressure of the fluid in the inlet zone when it enters the drainage flow path. The pressure difference will reduce the resistance of the fluid entering the drainage flow path, thereby improving the air charging efficiency of the self-relief fluid pump.

[0015] Optionally, there are two pressure relief chambers, each configured with a drainage chamber to form a set of common pressure relief passages, and the two sets of common pressure relief passages are symmetrically arranged.

[0016] By adopting the above technical solution, the setting of two sets of common charging and depressurizing passages increases the volume space of the corresponding flow path, thereby increasing the difficulty required for the pressure relief valve to disengage from the pressure relief port when the pressure in the depressurizing chamber pushes the valve plate, thereby further improving the charging stability of the self-depressurizing fluid pump.

[0017] Optionally, a fluid pressure buffer zone is provided between the two sets of common charging and depressurizing passages.

[0018] By adopting the above technical solution, the fluid pressure buffer zone and the pressure relief chamber are combined to increase the volume space required to generate the pressure required to push the pressure relief valve away from the pressure relief port. The increase in volume space increases the amount of fluid required to generate the same pressure, thereby increasing the difficulty of opening the pressure relief port and further improving the air charging efficiency of the self-relieving fluid pump.

[0019] Optionally, the fluid pressure buffer zone includes a buffer flow area and a buffer reservoir area, wherein the fluid flow area of ​​the buffer reservoir area increases in the direction away from the buffer flow area.

[0020] By adopting the above technical solution, the fluid flow area of ​​the buffer storage area increases in the direction away from the buffer flow area, making it easier for the fluid to enter the buffer storage area. However, the resistance to leaving the buffer storage area increases, which further increases the difficulty of opening the pressure relief port, thereby further improving the air charging efficiency of the self-relief fluid pump.

[0021] Optionally, the depth of the pressure relief chamber is greater than the sum of the depths of the leak control chamber and the leak control chamber.

[0022] By adopting the above technical solution, the volume difference between the pressure relief chamber, the leak control chamber, and the controlled leakage chamber can be more easily achieved in the production process by controlling the depth. This makes it easier to make the volume of the pressure relief chamber greater than the sum of the leak control chamber and the controlled leakage chamber. At this time, the flow rate required to close the pressure relief port can be much less than the flow rate required to open the pressure relief port. This reduces the difficulty of controlling the closure of the pressure relief port and increases the difficulty of opening the pressure relief port, thereby further improving the air charging stability of the self-relieving fluid pump.

[0023] Optionally, a releasable control zone is formed between the inner wall of the pressure relief chamber and the outer wall of the pressure relief pipe. The control chamber and the stop-release control chamber cooperate to form a pressurization zone, and the volume of the releasable control zone is larger than the volume of the pressurization zone.

[0024] By adopting the above technical solution, the volume of the pressure relief control zone is larger than the volume of the pressurization zone, which makes the flow rate required to close the pressure relief port much smaller than the flow rate required to open the pressure relief port. This reduces the difficulty of controlling the closure of the pressure relief port and increases the difficulty of opening the pressure relief port, thereby further improving the air charging stability of the self-relieving fluid pump.

[0025] Optionally, the wall of the leak control chamber is provided with a pressure control through hole for connecting to the flow chamber, and the arc formed by the pressure control through hole on the wall of the leak control chamber is a minor arc.

[0026] By adopting the above technical solution, the pressure control through hole set by the inferior arc increases the resistance of the fluid in the leak control chamber to flow back through the pressure control through hole, thereby increasing the difficulty of opening the pressure relief port and improving the air charging stability of the self-relieving fluid pump.

[0027] In summary, this application includes at least one of the following beneficial technical effects: This application improves the stability of the pressure relief port closure of the self-relief fluid pump by designing the length of the flow path inside the pump head, especially the length of the fluid flow path from the flow cavity to the discharge port and from the flow cavity to the pressure relief port. This application reduces the fluid flow area of ​​the controlled-release pressure-transformation zone in the direction away from the controlled-release flow area. When the fluid in the valve plate controlled-release chamber wants to flow through the controlled-release flow area and the controlled-release pressure-transformation zone, a pressure resistance will be generated. Thus, by reducing the difficulty of closing the pressure relief port, the difficulty of opening the pressure relief port is increased, thereby further improving the air charging stability of the self-relieving fluid pump. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a cross-sectional structural diagram of an embodiment of this application; Figure 3 This is a cross-sectional view of the pump head according to an embodiment of this application; Figure 4 This is a schematic diagram of fluid flow during operation of the pump working circuit of the pump cover in an embodiment of this application; Figure 5 This is a schematic diagram of fluid flow during operation of the valve working circuit of the pump cover in an embodiment of this application.

[0029] Figure 4 and Figure 5 The colored areas are only used for reference to show the virtual division of the fluid flow area, and are not cross-sections in a physical sense.

[0030] In the picture: 1. Power components; 2. Supporting component; 21. Base; 22. Diaphragm seat; 23. Diaphragm; 24. Rocker arm; 25. Eccentric wheel; 3. Pump head; 31. Valve seat; 32. Valve plate; 321. Inlet valve; 322. Pressure relief valve; 33. Pump cover; 331. Pressure relief pipe; a. Common passage for charging and discharging; a1. Fluid inlet chamber; a2. Flow chamber; a3. Fluid passageway; a4. Pressure control orifice; a5. Leakage control chamber; a6. Leakage control chamber; a7. Pressure relief chamber; a8. Pressure relief port; a9. Drainage chamber; a91. Inlet zone; a92. Leakage control and pressure transformation zone; a93. Leakage control and flow passage; a94. Drainage control and pressure transformation zone; a95. Drainage passageway zone; b. External access path; b1. Drain outlet; c. Fluid pressure buffer zone; c1. Buffer flow zone; c2. Buffer storage zone. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail below.

[0032] This application discloses a self-relief fluid pump.

[0033] Reference Figure 1 and Figure 2 A self-relief fluid pump includes a power component 1, a carrier component 2, and a pump head 3. The power component 1 is energized to generate driving force. The carrier component 2 receives the driving force generated by the power component 1 for fluid transport. The pump head 3 serves as both a dynamic seal for pump operation and a dynamic seal for valve operation, simultaneously forming the pump operating circuit and the valve operating circuit. The pump head 3 can receive the fluid transported by the carrier component 2 and allow unidirectional flow.

[0034] Power component 1 is a motor, and power component 1 has a power output shaft.

[0035] The carrier component 2 mainly consists of a base 21, a diaphragm seat 22, a diaphragm 23, a rocker arm 24, and an eccentric wheel 25. The diaphragm 23 has at least two bells along its axial direction. The base 21 is mounted on the power component 1, and the power output shaft of the power component 1 extends into the base 21. The diaphragm seat 22 is mounted on the base 21, and the diaphragm 23 is mounted on the diaphragm seat 22 and partially extends into the diaphragm seat 22. The eccentric wheel 25 is mounted on the power output shaft of the power component 1 and is driven to rotate by the power output shaft. One end of the rocker arm 24 is obliquely mounted on the eccentric wheel 25, and the other end of the rocker arm 24 is simultaneously connected to all the bells of the diaphragm 23. When the eccentric wheel 25 rotates, it drives the rocker arm 24 to swing, thereby causing the bells of the diaphragm 23 to periodically increase and decrease in volume, thus realizing the delivery of fluid to the pump head 3. The component composition and positional relationship of the pump head 3 are common knowledge well known to those skilled in the art and will not be described in detail here.

[0036] The core design feature of this self-relief fluid pump is the pump head 3. Therefore, if the carrier 2 is replaced with other pump head structures known to those skilled in the art, it is also within the scope of protection of this application.

[0037] Reference Figure 3 and Figure 4The pump head 3 has a common pressure-releasing passage a and an external passage b. The external passage b has a drain port b1 for connecting objects that need to be inflated, such as air bags. The number of external passages b can be one or more, depending on actual needs. The number of common pressure-releasing passages a corresponds one-to-one with the number of bells in the diaphragm 23, and all external passages b are connected to the common pressure-releasing passages a. In this embodiment, there are two sets of common pressure-releasing passages a, which are symmetrically arranged. In other embodiments, there can be three, four, or even more sets of common pressure-releasing passages a. Multiple sets of common pressure-releasing passages a can be spaced apart circumferentially or arranged symmetrically in pairs.

[0038] To improve the stability of the charging and discharging pressure, a fluid pressure buffer zone c is set between the two sets of shared charging and discharging pressure passages a. The fluid pressure buffer zone c includes a buffer flow area c1 and a buffer storage area c2. One end of the buffer flow area c1 is connected to the intersection of the two sets of shared charging and discharging pressure passages a, and the other end of the buffer flow area c1 is connected to the buffer storage area c2. The fluid passage area of ​​the buffer storage area c2 increases in the direction away from the buffer flow area c1, that is, the cross section in the direction of fluid movement in the buffer storage area c2 can be arranged in a trapezoidal shape.

[0039] The single-group pressure-relief common passage 'a' includes a fluid inlet chamber a1, a flow passage a2, a fluid circulation chamber a3, a pressure control orifice a4, a leak control chamber a5, a leak control chamber a6, a pressure relief chamber a7, and a drain chamber a9. The pressure relief chamber a7 has a pressure relief port a8. The fluid flow path length from the flow passage a2 to the drain port b1 is greater than the fluid flow path length from the flow passage a2 to the pressure relief port a8 via the leak control chamber a6.

[0040] Reference Figure 3 and Figure 4 When the pump working circuit is working: fluid enters the flow chamber a2 through the fluid inlet chamber a1; part of the fluid first passes through the fluid flow chamber a3, the pressure control hole a4, the leak control chamber a5 and the leak control chamber a6 in sequence. At this time, the fluid pushes the relevant components in the pump head 3 to close the pressure relief port a8 (how to close it will be explained in detail in the later structural description, and the direction of fluid flow will be explained here first), thereby limiting the pressure relief of the pump head 3; another part of the fluid flows through the drain chamber a9 to the drain port b1 of the external passage b in sequence, and then inflates the air bag outside the drain port b1.

[0041] Reference Figure 3 and Figure 5 When the valve working circuit is working: the fluid in the air bag flows back through the drain port b1 and enters the external passage b, then enters the pressure relief chamber a7 through the drain chamber a9, and finally is discharged to the outside through the pressure relief port a8 in the pressure relief chamber a7.

[0042] Reference Figure 2 and Figure 3In order to effectively realize the common passage a for charging and depressurization, the pump head 3 includes a valve seat 31, a valve plate 32 and a pump cover 33. The valve seat 31 is installed on the diaphragm seat 22 to connect with the carrier 2, the pump cover 33 is installed on the valve seat 31, and the valve plate 32 is sandwiched between the valve seat 31 and the pump cover 33.

[0043] Reference Figure 3 and Figure 4 The fluid inlet chamber a1, fluid flow chamber a3, pressure control through-hole a4, and leak-proof control chamber a5 are all disposed on the valve seat 31. The fluid inlet chamber a1 penetrates the valve seat 31 along the direction close to the support member 2 to receive fluid from the support member 2. The fluid flow chamber a3, pressure control through-hole a4, and leak-proof control chamber a5 are all located on the side of the valve seat 31 away from the support member 2. One end of the pressure control through-hole a4 is connected to the fluid flow chamber a3, and the other end is connected to the leak-proof control chamber a5. The arc formed by the pressure control through-hole a4 on the wall of the leak-proof control chamber a5 is a minor arc, which increases the resistance for the fluid in the leak-proof control chamber a5 to flow back through the pressure control through-hole a4, thereby increasing the difficulty of opening the pressure relief port a8 and improving the inflation stability of the self-relieving fluid pump.

[0044] Reference Figure 2 and Figure 3 The valve plate 32 is made of rubber to provide elasticity. Both the flow chamber a2 and the control chamber a6 are connected through the valve plate 32, and are linked by a fluid flow chamber a3, a pressure control through-hole a4, and a leak-proof control chamber a5. An inlet valve 321 is installed in the flow chamber a2. The inlet valve 321 closes the opening of the fluid inlet chamber a1 and can only open towards the pump cover 33, thus restricting the unidirectional opening and closing of the fluid inlet chamber a1. A pressure relief valve 322 is installed in the control chamber a6. The pressure relief valve 322 completely seals the control chamber a6. Under the combined action of the air pressure in the pressure relief chamber a7 and the control chamber a6, the pressure relief valve 322 can open and close the pressure relief port a8 to control the pressure relief function.

[0045] Reference Figure 3 and Figure 4 Both the pressure relief chamber a7 and the discharge chamber a9 are located on the side of the pump cover 33 near the valve seat 31, and the pressure relief chamber a7 and the discharge chamber a9 are interconnected. The discharge chamber a9 includes an inlet area a91, a controlled pressure relief area a92, a controlled pressure relief flow area a93, a discharge pressure relief area a94, and a discharge flow path area a95. The fluid passage area of ​​the controlled pressure relief area a92 increases along the direction closer to the controlled pressure relief flow area a93, and the fluid passage area of ​​the discharge pressure relief area a94 increases along the direction closer to the discharge flow path area a95.

[0046] The connection between the pressure relief chamber a7 and the drainage chamber a9 is arranged in a minor arc inside the pressure relief chamber a7. This allows fluid to preferentially flow towards the external passage b when passing through the connection between the pressure relief chamber a7 and the drainage chamber a9, slowing down the pressure rise within the pressure relief chamber a7 and enabling the pressure relief valve 322 to close the pressure relief port a8 more effectively and quickly. Specifically, the pressure relief chamber a7 and the controlled relief chamber a6 are completely separated by the pressure relief valve 322, and the pressure relief chamber a7 and the leak-stopping control chamber a5 are separated by the controlled relief chamber a6 and the pressure relief valve 322.

[0047] When the air pressure in the pressure relief chamber a7 is less than the air pressure in the controlled pressure relief chamber a6, the air pressure in the controlled pressure relief chamber a6 pushes the pressure relief valve 322 to move closer to the pressure relief port a8, thereby closing the pressure relief port a8 to prevent pressure relief, so that the pump head 3 can only be charged with air. When the air pressure in the pressure relief chamber a7 is greater than the air pressure in the controlled pressure relief chamber a6, the air pressure in the controlled pressure relief chamber a6 pushes the pressure relief valve 322 to move away from the pressure relief port a8, thereby opening the pressure relief port a8 to achieve pressure relief.

[0048] Reference Figure 2 and Figure 3 To improve the sealing stability of the pressure relief port a8 during inflation, a pressure relief pipe 331 is provided inside the pressure relief chamber a7. The pressure relief port a8 is the opening of the pressure relief pipe 331 within the pressure relief chamber a7 facing the pressure relief valve 322. A ventable control zone is formed between the inner wall of the pressure relief chamber a7 and the outer wall of the pressure relief pipe 331. The controlled venting chamber a6 and the leak-proof control chamber a5 cooperate to form a pressurization zone, and the volume of the ventable control zone is larger than the volume of the pressurization zone. To facilitate volume control, the depth of the pressure relief chamber a7 is greater than the depth of the leak-proof control chamber a5, and the depth of the pressure relief chamber a7 is greater than the depth of the controlled venting chamber a6. Preferably, the depth of the pressure relief chamber a7 is greater than the sum of the depths of the leak-proof control chamber a5 and the controlled venting chamber a6.

[0049] The implementation principle of a self-relief fluid pump according to an embodiment of this application is as follows: (1) When the pump working circuit is working: the power component 1 is energized to generate driving force, thereby driving the bearing component 2 to rotate to transport the fluid to the pump head 3. At this time, the fluid first enters from the fluid inlet chamber a1 of the valve seat 31 and pushes the inlet valve 321 of the valve plate 32 to open in one direction, thereby entering the flow chamber a2 of the valve plate 32. The fluid entering the flow chamber a2 will be divided into two parts. Since the fluid flow path length from the flow chamber a2 to the outlet b1 is greater than the fluid flow path length from the flow chamber a2 to the control relief chamber a6 on the side of the pressure relief port a8, a part of the fluid entering the pressure relief chamber a7 will reach the control relief chamber a6 of the valve plate 32 first, thereby pushing the pressure relief valve 322 of the valve plate 32 to deform and close the pressure relief port a8 of the pressure relief pipe 331, thereby turning off the pressure relief function of the self-relief fluid pump. Another portion of the fluid flows through the drain chamber a9 to the drain port b1. The drain port b1 is connected to an air bag or other object that needs to be inflated. Since the drain port b1 is farther from the fluid inlet chamber a1 than the pressure relief port a8, when the power component 1 continuously outputs driving force, the pressure in the control chamber a6 on the side of the pressure relief port a8 remains stable at a higher level than that of the drain port b1, so that the pressure relief valve 322 keeps the pressure relief port a8 closed. At this time, the self-relieving fluid pump only retains the inflation function.

[0050] (2) When the valve working circuit is working: When the power component 1 is de-energized and stops outputting driving force, the starting point of the conveyed fluid changes from the bearing component 2 to the air bag connected to the drain port b1. At this time, the pressure relief chamber a7 of the pump cover 33 is closer to the drain port b1 than the control relief chamber a6 of the valve plate 32. Therefore, the pressure in the pressure relief chamber a7 is greater than the pressure in the control relief chamber a6. The pressure in the pressure relief chamber a7 pushes the pressure relief valve 322 of the valve plate 32 away from the pressure relief port a8, and the pressure relief port a8 opens. The self-relieving fluid pump resumes its pressure relief function. At this time, the fluid enters the drain chamber a9 through the drain port b1. The fluid passes through the pressure relief chamber a7 connected to the drain chamber a9, and then is discharged to the outside through the pressure relief pipe 331 in the pressure relief chamber a7.

[0051] The embodiments described herein are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A self-relief fluid pump, characterized in that, include: Power component (1), used to be energized to generate driving force; The carrier (2) is used to receive the driving force generated by the power unit (1) for fluid transport; The pump head (3) serves as both a dynamic seal for pump operation and a dynamic seal for valve operation, simultaneously forming a pump working circuit and a valve working circuit. The pump head (3) receives the fluid transported by the carrier (2) and allows for unidirectional flow. The pump head (3) includes a valve seat (31), a valve plate (32), and a pump cover (33). The valve seat (31) is connected to the carrier (2), the pump cover (33) is installed on the valve seat (31), and the valve plate (32) is sandwiched between the valve seat (31) and the pump cover (33). The valve seat (31) has a fluid inlet chamber (a1), a fluid flow chamber (a3) ​​and a leak control chamber (a5), wherein the fluid inlet chamber (a1) receives fluid from the carrier (2); The valve plate (32) has a flow chamber (a2) and a control relief chamber (a6) that cooperate to form a pump working circuit and a valve working circuit. The flow chamber (a2) is provided with an inlet valve (321) that restricts the fluid from entering the chamber (a1) to open and close in one direction. The control relief chamber (a6) is provided with a pressure relief valve (322) for controlling the opening and closing of the pressure relief function. The pump cover (33) has a pressure relief chamber (a7) and a discharge chamber (a9) that are interconnected. The pump cover (33) has a discharge port (b1) that connects to the discharge chamber (a9) and a pressure relief port (a8) that connects to the pressure relief chamber (a7). The fluid flow path length from the flow passage (a2) to the discharge port (b1) is greater than the fluid flow path length from the flow passage (a2) to the pressure relief port (a8) through the control relief chamber (a6). The discharge chamber (a9) is connected to the control relief chamber (a6) of the valve plate (32) through the flow passage (a2). The pressure relief valve (322) of the valve plate (32) completely separates the pressure relief chamber (a7) and the leak control chamber (a5) of the valve seat (31). The pressure relief chamber (a7) is provided with a pressure relief pipe (331). The pressure relief port (a8) is the opening of the pressure relief pipe (331). The pressure relief valve (322) of the valve plate (32) opens and closes the pressure relief port (a8) of the pressure relief pipe (331). The depth of the pressure relief chamber (a7) is greater than the depth of the leak control chamber (a5). The depth of the pressure relief chamber (a7) is greater than the depth of the leak control chamber (a6).

2. The self-relief fluid pump according to claim 1, characterized in that, The drain chamber (a9) includes an inlet region (a91), a controlled-release pressure-changing region (a92), and a controlled-release flow-through region (a93). The fluid flow area of ​​the controlled-release pressure-changing region (a92) increases along the direction closer to the controlled-release flow-through region (a93).

3. A self-relief fluid pump according to claim 2, characterized in that, The drainage chamber (a9) further includes a drainage pressure transformation zone (a94) and a drainage flow path zone (a95), wherein the fluid flow area of ​​the drainage pressure transformation zone (a94) increases along the direction closer to the drainage flow path zone (a95).

4. A self-relief fluid pump according to claim 3, characterized in that, There are two pressure relief chambers (a7), and each pressure relief chamber (a7) is configured with one drainage chamber (a9) to form a set of pressure relief common passages (a), and the two sets of pressure relief common passages (a) are symmetrically arranged.

5. A self-relief fluid pump according to claim 4, characterized in that, A fluid pressure buffer zone (c) is provided between the two sets of common pressure relief passages (a).

6. A self-relief fluid pump according to claim 5, characterized in that, The fluid pressure buffer zone (c) includes a buffer flow area (c1) and a buffer storage area (c2), wherein the fluid flow area of ​​the buffer storage area (c2) increases in the direction away from the buffer flow area (c1).

7. A self-relief fluid pump according to claim 1, characterized in that, The depth of the pressure relief chamber (a7) is greater than the sum of the depths of the leak control chamber (a5) and the leak control chamber (a6).

8. A self-relief fluid pump according to claim 1, characterized in that, A ventable control zone is formed between the inner wall of the pressure relief chamber (a7) and the outer wall of the pressure relief pipe (331). The controlled venting chamber (a6) and the leak-stopping control chamber (a5) cooperate to form a pressurization zone. The volume of the ventable control zone is larger than the volume of the pressurization zone.

9. A self-relief fluid pump according to claim 1, characterized in that, The wall of the leak control cavity (a5) is provided with a pressure control through hole (a4) for connecting the flow cavity (a2), and the arc formed by the pressure control through hole (a4) on the wall of the leak control cavity (a5) is a minor arc.

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