Self-depressurizing pump head, self-depressurizing fluid pump and sphygmomanometer

Abstract

The present application relates to a self-depressurizing pump head, a self-depressurizing fluid pump and a sphygmomanometer, and belongs to the field of fluid delivery technology. The self-depressurizing pump head includes a pump cover, a valve seat and a valve plate. The valve plate is clamped between the pump cover and the valve seat, and has a leak-proof part and a one-way functional part. The pump cover is provided with an inflation channel and a deflation channel. The deflation channel is equipped with a deflation part. The deflation part is designed with a deflation hole and a positioning groove, and the positioning groove is located on the side of the deflation hole close to the valve plate. The leak-proof part of the valve plate is provided with a positioning platform that matches the positioning groove to improve the pressure-maintaining stability.

Description

Technical Field

[0001] The present application relates to the technical field of fluid delivery, and in particular to a self-pressure relief pump head, a self-pressure relief fluid pump and a sphygmomanometer. Background Art

[0002] A self-depressurizing fluid pump is an air pump that has the ability to automatically discharge gas after stopping inflation. It is often used in equipment that requires automatic deflation, such as sphygmomanometers. When using a sphygmomanometer, it is first necessary to pump gas into the air bag of the cuff or wristband through a fluid pump. After the gas pressure reaches a certain value, the sphygmomanometer measures the blood pressure. After the blood pressure measurement is completed, the compressed gas in the working bag cavity of the cuff or wristband needs to be discharged through the fluid pump. In order to improve the measurement accuracy of equipment such as sphygmomanometers, the pressure maintenance stability of the self-depressurizing fluid pump is very important.

[0003] Reference Figure 1 The patent with the authorization announcement number CN217735702U discloses an automatic deflation air pump. When the air pump is inflated, the gas flows from the first air chamber 312 to the second air chamber 313, and flows from the second air chamber 313 to the stop-discharge air chamber 333 and the exhaust air chamber 332 respectively. Since the air chamber volume of the stop-discharge air chamber 333 is smaller than the air chamber volume of the exhaust air chamber 332, the gas in the stop-discharge air chamber 333 is filled first, and the gas acts on the valve plate 330, and the valve plate 330 is used to block the exhaust hole 343, and then the gas passes through the exhaust air chamber 332 and the third air chamber 344 to achieve the inflation of the air pump. When the air pump is deflated, the gas returns from the inflation hole 342 to the third air chamber 344. Under the action of the gas, the valve plate 330 moves downward, the exhaust hole 343 is opened, and the exhaust hole 331 is closed, so that the gas is discharged along the exhaust hole 343.

[0004] However, in actual use, especially at the end of inflation and during testing, automatic deflation air pumps are prone to air leakage, resulting in poor pressure maintenance stability. Summary of the invention

[0005] In order to improve the pressure maintenance stability, the purpose of the present application is to provide a self-pressure relief pump head, a self-pressure relief fluid pump and a sphygmomanometer.

[0006] In the first aspect, the self-pressure relief pump head provided in the present application adopts the following technical solution:

[0007] A self-depressurizing pump head comprises a pump cover, a valve seat and a valve plate, wherein the valve plate is clamped between the pump cover and the valve seat, and the valve plate has a leak-stopping portion and a one-way functional portion;

[0008] The pump cover has an air filling channel and an air deflation channel. The air deflation channel is provided with an air deflation member. The air deflation member has an air deflation hole and a positioning groove. The positioning groove is located at one end of the air deflation hole close to the valve plate, and the positioning groove is connected to the air deflation hole.

[0009] The leak-proof portion of the valve plate has a positioning platform for cooperating with the positioning groove;

[0010] A leakage-stopping air chamber is formed between the valve seat and the leakage-stopping portion of the valve plate, and a one-way air inlet chamber is formed between the valve seat and the one-way functional portion of the valve plate.

[0011] By adopting the above technical solution, during inflation, the gas first enters the leak-stop chamber and the one-way air inlet chamber through the valve seat, and the air pressure in the leak-stop chamber increases to cause the leak-stop part to deform toward the positioning groove. At this time, the positioning platform will be embedded in the positioning groove during the deformation of the leak-stop part to ensure the accurate position of the leak-stop seal, thereby ensuring that the subsequent leak-stop part can stably seal the leak hole.

[0012] At the final stage of inflation and the detection stage, since the valve plate is made of elastic materials such as rubber or silicone, the pump in the prior art relies purely on the thinned part of the valve plate to cooperate with the boss of the air leakage hole opening, resulting in less elastic material actually in contact with the air leakage hole and less elastic deformation, so it is easy to be affected by the air pressure in the inflation channel and rebound, so that the stability of the leak-stopping part in blocking the air leakage hole is poor. The positioning platform set on the leak-stopping part in this solution cooperates with the air leakage hole, and the leak-stopping part and the positioning platform cooperate to increase the amount of elastic material used to block the air leakage hole to make the elastic deformation larger, thereby effectively improving the leak-stopping stability of the self-pressure relief pump head when dealing with the air pressure in the inflation channel, thereby making the self-pressure relief pump head more stable at the final stage of inflation and the detection stage.

[0013] Optionally, the positioning platform is provided with a first positioning protrusion for contacting the bottom surface of the positioning groove.

[0014] By adopting the above technical solution, the provision of the first positioning protrusion increases the contact area between the positioning platform and the positioning groove, further improving the sealing performance to make the self-pressure relief pump head more stable.

[0015] Optionally, the cross section of the first positioning protrusion is annular, and the outer diameter of the first positioning protrusion is greater than the diameter of the air leakage hole.

[0016] By adopting the above technical solution, when the annularly arranged first positioning protrusion cooperates with the positioning groove, the opening of the air leakage hole is located within the range of the first positioning protrusion, that is, the amount of elastic material used to seal the air leakage hole is further increased to make the elastic deformation larger, thereby improving the sealing effect and making the self-pressure relief pump head more stable.

[0017] Optionally, the air release member is integrally formed with the pump cover.

[0018] By adopting the above technical solution, the one-piece molding structure simplifies the manufacturing process and improves the stability of the overall structure.

[0019] Optionally, a second positioning protrusion for contacting the positioning platform is provided at the bottom of the positioning groove.

[0020] By adopting the above technical solution, the provision of the second positioning protrusion increases the contact area between the positioning platform and the positioning groove, further improving the sealing performance to make the self-pressure relief pump head more stable.

[0021] Optionally, the second positioning protrusion is arranged around the opening of the air leakage hole, and when the leakage-stopping part cooperates with the positioning platform, the second positioning protrusion is in partial or full contact with the leakage-stopping part.

[0022] By adopting the above technical solution, when the annular second positioning protrusion cooperates with the positioning platform, the elastic deformation amount of the elastic material used to block the air leakage hole is further increased, thereby improving the sealing effect and making the self-pressure relief pump head more stable.

[0023] Optionally, the air leaking piece is elastic, the air leaking piece is fixedly connected to the pump cover, and the air leaking hole is located in the air leaking piece.

[0024] By adopting the above technical solution, the air relief part and the positioning table are both made of elastic materials. The mutual extrusion of soft against soft can further improve the sealing performance. The elasticity can better adapt to pressure changes and maintain stable sealing performance, thereby improving the sealing effect and making the self-pressure relief pump head more stable.

[0025] Optionally, the pump cover has a mounting hole for mounting an air leaking member, an end surface of the air leaking member close to one end of the valve plate is located in the mounting hole, and the positioning groove is formed by the end surface of the air leaking member close to one end of the valve plate and the inner wall of the mounting hole.

[0026] By adopting the above technical solution, the end face of the air relief part and the inner wall of the mounting hole are combined to form a positioning groove, so that the bottom of the positioning groove has elasticity, thereby improving the positioning accuracy and sealing quality of the positioning platform, thereby improving the sealing effect and making the self-pressure relief pump head more stable.

[0027] In the second aspect, the self-depressurizing fluid pump provided in the present application adopts the following technical solution:

[0028] A self-depressurizing fluid pump comprises a pump head as described above.

[0029] By adopting the above technical solution, the self-pressure relief pump head increases the elastic deformation amount for blocking the leakage hole to effectively improve the anti-leakage stability, thereby making the self-pressure relief fluid pump more stable in the final stage of inflation and the detection stage.

[0030] In the third aspect, the sphygmomanometer provided in this application adopts the following technical solution:

[0031] A sphygmomanometer comprises the above-mentioned self-depressurizing fluid pump.

[0032] By adopting the above technical solution, the self-pressure relief fluid pump increases the elastic deformation amount for blocking the air leakage hole to effectively improve the anti-leakage stability, thereby making the self-pressure relief fluid pump more stable in the final stage of inflation and the detection stage.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. The pump cover, valve seat and valve plate cooperate with each other. Through the cooperation of the positioning platform and the positioning groove, the elastic deformation of the elastic material used to block the air leakage hole is increased, the sealing between the air leakage part and the leak-proof part is increased, and the pressure-maintaining stability is improved;

[0035] 2. The first positioning protrusion and / or the second positioning protrusion are provided to further enhance the sealing effect between the positioning groove and the positioning platform and improve the pressure-maintaining stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of an automatic deflation air pump of the related art;

[0037] Figure 2 is a schematic cross-sectional structural diagram of Embodiment 1 of the present application;

[0038] Figure 3 It is a schematic diagram of the explosion structure of Example 1 of the present application;

[0039] Figure 4 It is a cross-sectional view of the self-pressure relief pump head structure of the first embodiment of the present application;

[0040] Figure 5 This is a schematic diagram of the gas fluid path in the inflated state of the first embodiment of the present application;

[0041] Figure 6 is a schematic diagram of a gas fluid path in a deflated state of Embodiment 1 of the present application;

[0042] Figure 7 is a cross-sectional view of the self-pressure relief pump head structure of the second embodiment of the present application;

[0043] Figure 8 is a cross-sectional view of the self-pressure relief pump head structure of the third embodiment of the present application;

[0044] Fig. 9 is a cross-sectional view of the self-pressure relief pump head structure of the fourth embodiment of the present application;

[0045] In the figure:

[0046] 1. Self-pressure relief pump head;

[0047] 11. Pump cover; 111. Inflating channel; 112. Deflating channel; 113. Deflating member; 1131. Deflating hole; 1132. Positioning groove; 1133. Second positioning protrusion;

[0048] 12. Valve seat; 121. Air inlet channel; 122. One-way function platform; 123. One-way air inlet chamber; 124. Anti-leakage air chamber; 1121. Mounting hole;

[0049] 13, valve plate; 131, leak-stopping part; 1311, positioning platform; 1312, first positioning protrusion; 132, one-way functional part;

[0050] 2. Pump body; 21. Diaphragm seat; 22. Inflatable diaphragm;

[0051] 4. Driving part; 41. Motor; 42. Fixed seat; 43. Eccentric wheel; 44. Rocker arm. DETAILED DESCRIPTION

[0052] The following is combined with Figure 1-5 , further details of this application are given.

[0053] The embodiment of the present application discloses a self-depressurizing fluid pump, which can be used for equipment such as sphygmomanometers that need to be automatically deflated after inflation. The design core of the present application lies in the self-depressurizing pump head 1 of the self-depressurizing fluid pump, which can be replaced in various self-depressurizing fluid pumps or pump-valve-in-one, such as the automatic deflation air pump with patent number 2022218871948, the automatic pressure relief pump with patent number 2021229068671, and the pump with patent number 2021228720850.

[0054] Although the self-depressurizing pump head 1 in the embodiment of the present application does not specify the provision of a check valve plate 13 similar to that in Patent No. 2021228720850, such check valve plates 13 or umbrella-shaped one-way valves are conventional technical means known to those skilled in the art and are also within the scope of protection of the present application.

[0055] Embodiment 1:

[0056] Reference Figure 2 and Figure 3 The self-pressure relief fluid pump comprises a self-pressure relief pump head 1 , a pump body 2 and a driving member 4 , wherein the driving member 4 is used to provide a driving force to the pump body 2 so that the pump body 2 can deliver fluid to the self-pressure relief pump head 1 .

[0057] The self-depressurizing pump head 1 comprises a pump cover 11, a valve seat 12 and a valve plate 13. The valve plate 13 is clamped between the pump cover 11 and the valve seat 12. The pump cover 11 and the valve seat 12 can be connected by ultrasonic melting, snap connection or screw connection.

[0058] The pump cover 11 has an inflation channel 111 and an air deflation channel 112. The inflation channel 111 is usually formed by an integrally formed tubular structure, which is used to connect the air bag so that gas can flow between the air bag. The air deflation channel 112 is used to discharge the gas after the inflation is completed. The air deflation channel 112 is provided with an air deflation part 113, and the air deflation part 113 has an air deflation hole 1131 and a positioning groove 1132. The axis of the positioning groove 1132 is substantially coincident with the axis of the air deflation hole 1131. The positioning groove 1132 is located at one end of the air deflation hole 1131 close to the valve plate 13, and the positioning groove 1132 is connected to the air deflation hole 1131. When deflated, the gas flows through the positioning groove 1132 and the air deflation hole 1131 in sequence to be discharged from the pump. In the first embodiment, the material of the air deflation part 113 is the same as that of the pump cover 11, and the air deflation part 113 is integrally formed with the pump cover 11.

[0059] The valve seat 12 has an air inlet channel 121 for receiving the gas delivered by the pump body 2. The valve seat 12 is provided with a one-way functional platform 122 for cooperating with the valve plate 13 to realize one-way gas flow, and the position of the one-way functional platform 122 is offset from the position of the air release member 113 on the pump cover 11.

[0060] Reference Figure 4 The valve plate 13 is made of elastic materials such as rubber or silicone to have elasticity. The valve plate 13 has a leak-proof portion 131 and a one-way functional portion 132. A one-way air inlet chamber 123 is formed between the one-way functional portion 132 and the valve seat 12. The one-way functional portion 132 of the valve plate 13 cooperates with the one-way functional stage 122 of the valve seat 12 to realize the one-way air inlet chamber 123 to transport gas to the inflation channel 111 in one direction. The leak-proof portion 131 can elastically deform toward the leak hole 1131 to block the leak hole 1131, and a leak-proof air chamber 124 is formed between the leak-proof portion 131 and the valve seat 12. The leak-proof air chamber 124 and the one-way air inlet chamber 123 are both connected to the air inlet channel 121. It should be noted that, in other embodiments, a check valve plate 13 may be provided in the area where the air intake channel 121 connects the anti-leakage air chamber 124 and the one-way air intake chamber 123 to limit the gas in the anti-leakage air chamber 124 and the one-way air intake chamber 123 from flowing back to the air intake channel 121 .

[0061] In order to improve the anti-leakage sealing effect, the anti-leakage portion 131 of the valve plate 13 has a positioning platform 1311 for cooperating with the positioning groove 1132. When the anti-leakage portion 131 is deformed to protrude toward the positioning groove 1132, the positioning platform 1311 enters the positioning groove 1132 and is deformed and pressed against the bottom of the positioning groove 1132. At this time, the positioning platform 1311 can completely close the opening of the air leakage hole 1131 to achieve sealing. The cross-section of the positioning platform 1311 can be circular, square or other special shapes, and it is only necessary to ensure that the positioning platform 1311 can completely close the opening of the air leakage hole 1131. The inner wall of the positioning groove 1132 can be tilted outward along the direction of the principle air leakage hole 1131 to guide the positioning platform 1311 when it enters the positioning groove 1132.

[0062] Reference Figure 3 The pump body 2 includes a diaphragm seat 21 and an inflatable diaphragm 22 installed in the diaphragm seat 21, and the driving member 4 includes a motor 41, a fixing seat 42, an eccentric wheel 43 and a rocker 44. The structure and connection method of the pump body 2 and the structure and connection method of the driving member 4 are conventional technical means well known to those skilled in the art and will not be described in detail here.

[0063] Reference Figure 5 and Figure 6 The implementation principle of the self-depressurizing fluid pump of the first embodiment is:

[0064] 1) During inflation, the driving member 4 is energized to drive the inflation diaphragm 22 of the pump body 2 to deform, so that the inflation diaphragm 22 can transport gas through the air inlet channel 121 of the valve seat 12 to first enter the anti-leakage air chamber 124 and the one-way air inlet chamber 123, and the air pressure in the anti-leakage air chamber 124 increases to make the anti-leakage part 131 deform toward the positioning groove 1132. At this time, the positioning platform 1311 will be embedded in the positioning groove 1132 during the deformation of the anti-leakage part 131. The positioning platform 1311 presses the bottom surface of the positioning groove 1132 and completely seals the opening of the air leakage hole 1131. After the gas passing through the one-way air inlet chamber 123 passes through the one-way functional part 132 of the valve sheet 13, it enters the air bag through the inflation channel 111;

[0065] 2) During the test, the driving member 4 remains energized, and the pump body 2 continues to deliver air to stabilize the air pressure in the anti-leakage air chamber 124 to ensure that the positioning platform 1311 seals the air leakage hole 1131;

[0066] 3) After the test is completed, the driving member 4 is powered off, and the pump body 2 stops supplying air to reduce the air pressure in the anti-leakage air chamber 124. The anti-leakage portion 131 is deformed and restored to allow the positioning platform 1311 to disengage from the positioning groove 1132. At this time, the gas in the air bag flows back into the pump through the inflation channel 111, and then is discharged to the outside of the pump through the leak hole 1131.

[0067] Embodiment 2:

[0068] Reference Figure 7 The difference between the second embodiment and the first embodiment lies in the structure of the positioning platform 1311 on the leakage-stopping portion 131 .

[0069] The positioning platform 1311 is provided with a first positioning protrusion 1312 . The first positioning protrusion 1312 is used to contact the bottom surface of the positioning groove 1132 . The material of the first positioning protrusion 1312 is the same as that of the positioning platform 1311 and is integrally formed.

[0070] The cross section of the first positioning protrusion 1312 is annular. When the positioning platform 1311 is embedded in the positioning groove 1132, the axis of the first positioning protrusion 1312 is substantially coincident with the axis of the air leakage hole 1131. The outer diameter of the first positioning protrusion 1312 is greater than the diameter of the air leakage hole 1131, so that the opening of the air leakage hole 1131 is located within the range of the first positioning protrusion 1312.

[0071] The implementation principle of the second embodiment is the same as that of the first embodiment.

[0072] Embodiment three:

[0073] Reference Figure 8 The difference between the third embodiment and the first embodiment lies in the structure of the positioning groove 1132 on the air leaking member 113 .

[0074] A second positioning protrusion 1133 is disposed at the bottom of the positioning groove 1132 . The second positioning protrusion 1133 is used to contact the positioning platform 1311 . The material of the second positioning protrusion 1133 is the same as that of the positioning groove 1132 and is integrally formed.

[0075] The second positioning protrusion 1133 is arranged around the opening of the air leakage hole 1131. The second positioning protrusion 1133 can be a single structure with a circular cross-section, or a plurality of dot-shaped structures or linear structures distributed at equal intervals with the axis of the air leakage hole 1131 as the center. The axis of the second positioning protrusion 1133 is substantially coincident with the axis of the air leakage hole 1131. When the leakage stop portion 131 cooperates with the positioning platform 1311, the second positioning protrusion 1133 is in full contact with the leakage stop portion 131. In other embodiments, the second positioning protrusion 1133 can also be partially in contact with the leakage stop portion 131.

[0076] The implementation principle of the third embodiment is the same as that of the first embodiment.

[0077] Embodiment 4:

[0078] Reference Fig. 9 The difference between the fourth embodiment and the first embodiment lies in the structure of the location of the air leakage channel 112.

[0079] The air leaking piece 113 may be made of elastic material such as rubber to have elasticity. The air leaking piece 113 is fixedly connected to the pump cover 11 by means of snap connection or gluing, and the air leaking hole 1131 is located in the air leaking piece 113 .

[0080] The pump cover 11 has a mounting hole 1121 for mounting the air leaking member 113. The end surface of the air leaking member 113 close to one end of the valve plate 13 is located in the mounting hole 1121. The positioning groove 1132 is formed by the end surface of the air leaking member 113 close to one end of the valve plate 13 and the inner wall of the mounting hole 1121, so that the bottom of the positioning groove 1132 is elastic. When the positioning platform 1311 is embedded in the positioning groove 1132, the bottom of the positioning groove 1132 and the positioning platform 1311 are soft against soft and squeezed against each other to achieve sealing.

[0081] Reference Fig. 9 The positioning platform 1311 is provided with a first positioning protrusion 1312, and the first positioning protrusion 1312 is used to contact the bottom surface of the positioning groove 1132. The material of the first positioning protrusion 1312 is the same as that of the positioning platform 1311 and is integrally formed.

[0082] The implementation principle of the fourth embodiment is the same as that of the first embodiment.

[0083] The embodiment of the present application discloses a sphygmomanometer, which mainly includes the above-mentioned self-pressure relief fluid pump. The pump is the core component for fluid transportation in the sphygmomanometer, and its sealing stability will have a great impact on the detection of the sphygmomanometer. The present application improves the stability of the detection result of the sphygmomanometer by improving the sealing stability of the self-pressure relief fluid pump, so that the measurement result of the sphygmomanometer is more accurate.

[0084] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same parts are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. Therefore: All equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A self-depressurizing pump head, comprising a pump cover (11), a valve seat (12) and a valve plate (13), wherein the valve plate (13) is sandwiched between the pump cover (11) and the valve seat (12), and the valve plate (13) has a leak-stopping portion (131) and a one-way functional portion (132), characterized in that: The pump cover (11) has an air filling channel (111) and an air deflation channel (112); the air deflation channel (112) is provided with an air deflation member (113); the air deflation member (113) has an air deflation hole (1131) and a positioning groove (1132); the positioning groove (1132) is located at one end of the air deflation hole (1131) close to the valve plate (13); the positioning groove (1132) is communicated with the air deflation hole (1131); the anti-leakage portion (131) of the valve plate (13) has a positioning platform (1311) for cooperating with the positioning groove (1132); a anti-leakage air chamber (124) is formed between the valve seat (12) and the anti-leakage portion (131) of the valve plate (13); and a one-way air inlet chamber (123) is formed between the valve seat (12) and the one-way functional portion (132) of the valve plate (13).

2. A self-depressurizing pump head according to claim 1, characterized in that: The positioning platform (1311) is provided with a first positioning protrusion (1312) for contacting the bottom surface of the positioning groove (1132).

3. A self-depressurizing pump head according to claim 2, characterized in that: The cross section of the first positioning protrusion (1312) is arranged in a ring shape, and the outer diameter of the first positioning protrusion (1312) is larger than the diameter of the air leakage hole (1131).

4. A self-depressurizing pump head according to claim 1, characterized in that: The air leaking member (113) and the pump cover (11) are integrally formed.

5. A self-depressurizing pump head according to claim 1, characterized in that: The bottom of the positioning groove (1132) is provided with a second positioning protrusion (1133) for contacting the positioning platform (1311).

6. A self-depressurizing pump head according to claim 5, characterized in that: The second positioning protrusion (1133) is arranged around the opening of the air leakage hole (1131), and when the leakage-stopping part (131) cooperates with the positioning platform (1311), the second positioning protrusion (1133) is in partial or full contact with the leakage-stopping part (131).

7. A self-depressurizing pump head according to claim 1, characterized in that: The air leaking member (113) is elastic, the air leaking member (113) is fixedly connected to the pump cover (11), and the air leaking hole (1131) is located on the air leaking member (113).

8. A self-depressurizing pump head according to claim 7, characterized in that: The pump cover (11) has a mounting hole (1121) for mounting the air leaking member (113); an end surface of the air leaking member (113) close to one end of the valve plate (13) is located in the mounting hole (1121); and the positioning groove (1132) is formed by enclosing an end surface of the air leaking member (113) close to one end of the valve plate (13) and an inner wall of the mounting hole (1121).

9. A self-depressurizing fluid pump, characterized in that: Comprising a pump head as claimed in any one of claims 1 to 8.

10. A sphygmomanometer, characterized in that: Comprising the self-relieving fluid pump of claim 9.

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