Inflation and exhaust integrated pump for sphygmomanometer
By designing the automatically adjusted first exhaust passage and leak passage structure in the blood pressure meter, the problem of the blood pressure meter being unable to exhaust during power failure is solved, normal exhaust in the case of power outage is achieved, and cost is reduced .
Patent Information
- Application Number
- CN202420846224.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-22
AI Technical Summary
The integrated charging and exhaust pump in the existing blood pressure meter cannot exhaust normally when the power is out of power, resulting in the failure of the equipment.
A blood pressure meter charging and exhaust integrated pump including an upper cover body, a lower housing, a rotating driver, a connecting rod mechanism, a first exhaust passage and a leak passage is designed, and the gas pressure is changed by using the first exhaust valve plate structure. Automatically open or close the channel when power is cut off to ensure that gas is discharged through the leaking channel and achieve normal exhaust.
In the event of a power failure, the blood pressure meter can exhaust gas normally with an integrated pump for charging and exhaust, reducing costs, and by adjusting the valve plate structure, the opening size of the leak channel is adjusted to ensure the stability of gas emissions.
Smart Images
Figure CN222208248U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of sphygmomanometers, in particular to an integrated inflation and exhaust pump for sphygmomanometers. Background Art
[0002] A micro air pump is a pump with a reduced volume. The volume of the micro air pump depends on the volume of each component of the micro air pump. The micro air pump is widely used in technical fields such as medical equipment. Among them, the micro air pump is a necessary component of a sphygmomanometer, especially a booster sphygmomanometer.
[0003] At present, in the integrated inflation and exhaust air pump disclosed in Chinese patent application No. 202121933071.9 and the electronic sphygmomanometer including the air pump, its exhaust is achieved by the motor driving the exhaust mechanism through a connecting rod mechanism to realize the exhaust function; when a power failure occurs, the motor cannot work due to power loss, resulting in the inability of the connecting rod mechanism to drive the exhaust mechanism to perform exhaust work.
[0004] Therefore, there is an urgent need for an integrated inflation and exhaust pump for a sphygmomanometer to overcome the above-mentioned defects. Utility Model Content
[0005] The utility model aims to provide an integrated inflation and exhaust pump for a sphygmomanometer which can normally exhaust air in the event of a power failure.
[0006] In order to achieve the above-mentioned purpose, the utility model of the integrated inflation and exhaust pump for a sphygmomanometer includes an upper cover body, a lower shell, a capsule body having a substrate and an airbag, a rotary driver assembled and connected with the lower shell, a connecting rod mechanism provided between the rotary driver and the airbag, a first exhaust channel formed at the upper cover body and the substrate, and an air leakage channel formed at the upper cover body. The substrate is sealedly installed between the upper cover body and the lower shell, and the upper cover body is provided with a first air chamber, a second air chamber connected to the first air chamber, an external channel connected to the second air chamber, and a first check valve plate structure for preventing the gas in the first air chamber from flowing back to the airbag. The rotary driver drives the airbag to perform telescopic movement through the connecting rod mechanism. The first exhaust channel is connected to the second air chamber, and a first exhaust valve plate structure is provided in the first air chamber. The first exhaust valve plate structure closes the connection between the second air chamber and the first exhaust channel when the air pressure of the first air chamber is greater than the air pressure of the second air chamber, and opens the connection between the second air chamber and the first exhaust channel when the air pressure of the first air chamber is less than the air pressure of the second air chamber. The leakage channel is connected to the first air chamber, and the gas in the first air chamber can flow away through the leakage channel to make the air pressure of the first air chamber lower than the air pressure of the second air chamber.
[0007] Compared with the prior art, by means of a first exhaust channel formed at the upper cover body and the substrate and connected to the second air chamber, and a leakage channel formed at the upper cover body and connected to the first air chamber, and a first exhaust valve plate structure for opening and closing the connection between the second air chamber and the first exhaust channel is provided in the first air chamber; therefore, in the event of a power failure, the gas in the first air chamber can flow away through the leakage channel, so that the air pressure of the first air chamber is less than the air pressure of the second air chamber. When the air pressure of the second air chamber is less than the air pressure of the first air chamber, the first exhaust valve plate structure at this time opens the connection between the first exhaust channel and the second air chamber, so that the gas entering the second air chamber from the external channel is discharged by the first exhaust channel, and the purpose of the utility model of the integrated pump for sphygmomanometer to exhaust normally under power failure is achieved. Because the integrated pump for sphygmomanometer of the utility model can achieve normal exhaust under power failure by means of the cooperation of the leakage channel, the first exhaust channel and the first exhaust valve plate structure, the integrated pump for sphygmomanometer of the utility model has the advantage of low cost.
[0008] Preferably, the integrated inflation and exhaust pump for the sphygmomanometer of the utility model also includes an adjustment screw threadedly connected to the upper cover body and exposed to the outside, and the upper cover body is provided with an adjustment valve plate structure for adjusting the opening size of the leakage channel, and the adjustment valve plate structure is arranged in linkage with the adjustment screw.
[0009] Preferably, the adjusting valve plate structure is located between the air leakage channel and the first air chamber and is arranged to extend laterally along the upper cover body to block the communication between the air leakage channel and the first air chamber, and a connecting channel for connecting the first air chamber with the air leakage channel is opened on the adjusting valve plate structure; the adjusting screw is arranged to extend in the up and down directions of the upper cover body and is exposed to the outside from the top of the upper cover body, and the adjusting screw is also located directly above the air leakage channel, and the lower end of the adjusting screw is pushed and matched with the adjusting valve plate structure, and the air leakage channel is exposed to the outside from the side of the upper cover body.
[0010] Preferably, the first exhaust passage is also formed at the lower shell body and is extended along the up-down direction of the upper cover body.
[0011] Preferably, a second check valve structure for preventing the gas in the second air chamber from flowing back to the first air chamber is provided in the upper cover body.
[0012] Preferably, a third air chamber is provided on the lower shell body, and the third air chamber is connected between the first air chamber and the second air chamber, so that the gas in the first air chamber flows to the second air chamber through the third air chamber, and a third check valve plate structure is provided on the substrate for preventing the gas in the third air chamber from flowing back to the first air chamber.
[0013] Preferably, the first check valve plate structure, the second check valve plate structure, the first exhaust valve plate structure and the adjustment valve plate structure together constitute an integrated structure, and the integrated structure is embedded in the upper cover body and covered by the upper cover body.
[0014] Preferably, the integrated inflation and exhaust pump for the sphygmomanometer of the utility model also includes a second exhaust channel and a second exhaust valve, the second exhaust channel is formed at the upper cover body, the base plate and the lower shell body, the second exhaust channel is also connected to the first air chamber or the second air chamber, the second exhaust valve is installed at the upper cover body, and the connecting rod mechanism is driven to rise by the rotary driver to link the second exhaust valve to close the second exhaust channel, and the connecting rod mechanism is driven to descend by the rotary driver to link the second exhaust valve to open the second exhaust channel.
[0015] Preferably, the second exhaust channel connected to the first air chamber includes two upper and lower sections extending along the upper and lower directions of the upper cover body and a lateral extension section extending from the side of the upper cover body, and the lateral extension section is connected between the two upper and lower sections; the second exhaust channel connected to the second air chamber is extended and arranged along the upper and lower directions of the upper cover body.
[0016] Preferably, the external connection channel is arranged to extend upward along the up-down direction of the upper cover body. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a stereoscopic view of the integrated inflation and exhaust pump for a sphygmomanometer according to the first embodiment of the utility model.
[0018] Figure 2 yes Figure 1 The shown exploded view of the integrated inflation / exhaust pump for a sphygmomanometer with the lower housing removed.
[0019] Figure 3 yes Figure 1 Floor plan viewed from top to bottom.
[0020] Figure 4 is along Figure 3 Internal view cut along the midline BB.
[0021] Figure 5 is along Figure 3 Internal view of the section taken along the mid-CC line.
[0022] Figure 6 is along Figure 3 Internal view of the mid-DD line section.
[0023] Figure 7 It is a top-down plan view of the integrated inflation and exhaust pump for a sphygmomanometer according to the second embodiment of the utility model.
[0024] Figure 8 is along Figure 7 Internal view cut along the midline EE.
[0025] Fig. 9 is along Figure 7 Internal view cut along the midline FF. DETAILED DESCRIPTION
[0026] In order to explain the technical content and structural features of the present invention in detail, further description will be given below in combination with the embodiments and the accompanying drawings.
[0027] See also Figures 1 to 5 The first embodiment of the integrated inflation and exhaust pump 100 for a sphygmomanometer includes an upper cover body 10, a lower shell body 20, a capsule body 30 having a substrate 31 and an air bag 32, a rotation driver 40 assembled and connected to the lower shell body 20, a connecting rod mechanism 50 provided between the rotation driver 40 and the air bag 32, a first exhaust channel 60 formed at the upper cover body 10, the substrate 31 and the lower shell body 20, and an air leakage channel 70 formed at the upper cover body 10. The substrate 31 is sealingly assembled between the upper cover body 10 and the lower shell body 20 to ensure that the mating position of the substrate 31, the upper cover body 10 and the lower shell body 30 is sealed, thereby preventing gas from leaking outward from the mating position. Optionally, as an example, the substrate 31 is clamped between the upper cover body 10 and the lower shell body 20 in the up and down directions of the upper cover body 10 to realize a stacked arrangement relationship of the three. See the state. Figures 4 to 6 Obviously, according to actual needs, the relationship between the substrate 31, the upper cover 10 and the lower shell 30 can also be other, so it is not Figures 4 to 6 The figure is limited; in addition, the upper cover body 10 is provided with a first air chamber 11, a second air chamber 12 connected to the first air chamber 11, an external channel 13 connected to the second air chamber 12, and a first check valve sheet structure 14 for blocking the gas in the first air chamber 11 from flowing back to the airbag 32.
[0028] At the same time, the rotary driver 40 drives the airbag 32 to perform telescopic movement through the connecting rod mechanism 50, so that the airbag 32 inhales gas during the telescopic movement, and the inhaled gas pushes open the first check valve plate structure 14 and enters the first air chamber 11; optionally, as an example, the rotary driver 40 is a motor, so that the rotary driver 40 can perform forward and reverse movement more reliably.
[0029] Furthermore, the first exhaust channel 60 is connected with the second air chamber 12 to meet the need that the gas in the second air chamber 12 can flow to the first exhaust channel 60; the first exhaust valve plate structure 16 is provided in the first air chamber 11, and the first exhaust valve plate structure 16 closes the connection between the second air chamber 12 and the first exhaust channel 60 when the air pressure of the first air chamber 11 is greater than the air pressure of the second air chamber 12, and opens the connection between the second air chamber 12 and the first exhaust channel 60 when the air pressure of the first air chamber 11 is less than the air pressure of the second air chamber 12. The leakage channel 70 is connected with the first air chamber 11, so that the gas in the first air chamber 11 can flow away through the leakage channel 70, so that the air pressure of the first air chamber 11 is less than the air pressure of the second air chamber 12. It should be noted that since the leakage channel 70 is a micro-leakage for the flow of gas, it will not affect the normal inflation work, so it is required that the leakage channel 70 should not be opened too large, and the specific size is obtained by those skilled in the art based on the present application according to actual needs, so it will not be repeated here. More specifically, as follows:
[0030] like Figure 3 and Figure 4 As shown, as an example, the inflation and exhaust integrated pump 100 for a sphygmomanometer of the first embodiment further includes an adjustment screw 80 which is threadedly connected to the upper cover body 10 and exposed to the outside. The upper cover body 10 is provided with an adjustment valve plate structure 17 for adjusting the opening size of the leakage channel 70. The adjustment valve plate structure 17 is linked with the adjustment screw 80, so that the operator can adjust the opening size of the leakage channel 70 by screwing the adjustment screw 80, thereby achieving the purpose of fine-tuning the leakage flow of the leakage channel 70. Specifically, Figure 4 As an example, the adjusting valve plate structure 17 is located between the air leakage channel 70 and the first air chamber 11 and is arranged to extend along the lateral direction of the upper cover body 20 (for example, a vertical direction perpendicular to the up-down direction of the upper cover body 10), and the adjusting valve plate structure 17 blocks the communication between the air leakage channel 70 and the first air chamber 11. The adjusting valve plate structure 17 is provided with a communication channel 172 that connects the first air chamber 11 with the air leakage channel 70. Figure 4As shown. In addition, the adjusting screw 80 is arranged along the vertical direction of the upper cover body 10 and is exposed from the top of the upper cover body 10, so that the operator can screw the adjusting screw 80 from the top of the upper cover body 10; the adjusting screw 80 is located directly above the air leakage channel 70, and the lower end of the adjusting screw 80 pushes and cooperates with the adjusting valve plate structure 17, so that the adjusting screw 80 maintains a contact state with the adjusting valve plate structure 17 by virtue of the elasticity of the adjusting valve plate structure 17, thereby simplifying the linkage structure between the adjusting screw 80 and the adjusting valve plate structure 17, and when the adjusting screw 80 pushes the adjusting valve plate structure 17 downward, the adjusting valve plate structure 17 is pushed out to form a protruding structure 171 protruding from the air leakage channel 80, and the protruding degree of the protruding structure 171 is related to the downward sliding distance of the adjusting screw 80; and the air leakage channel 70 is exposed from the side of the upper cover body 10, so as to reduce the position occupied by the air leakage channel 70 in the vertical direction of the upper cover body 10. In addition, the first exhaust channel 60 is arranged to extend in the vertical direction of the upper cover 10 to guide the gas in the first exhaust channel 60 to the matching position between the rotary driver 40 and the lower shell 20. Figure 4 The first exhaust channel 60 is shown to be formed at the upper cover 10, the substrate 31 and the lower shell 20. Obviously, according to actual needs, the first exhaust channel 60 can also be formed at the upper cover 10 and the substrate 31. Figure 4 Limits shown.
[0031] like Figures 4 to 6 As shown, as an example, a second check valve plate structure 15 is provided in the upper cover body 10 for preventing the gas in the second air chamber 11 from flowing back to the first air chamber 11, so that under the action of the second check valve plate structure 15, only the gas in the first air chamber 11 is allowed to flow to the second air chamber 12, that is, when the air pressure in the first air chamber 11 is greater than the air pressure in the second air chamber 12, the gas in the first air chamber 11 enters the second air chamber 12 by pushing open the second check valve plate structure 15; when the air pressure in the second air chamber 12 is greater than the air pressure in the first air chamber 11, the second check valve plate structure 15 is reset under the action of the gas in the second air chamber 12 and the rebound force of the second check valve plate structure 15, so that the connection between the first air chamber 11 and the second air chamber 12 is closed by the reset second check valve plate structure 15.
[0032] like Figures 4 to 6 As shown, as an example, the first check valve plate structure 14, the second check valve plate structure 15, the first exhaust valve plate structure 16 and the adjustment valve plate structure 17 together constitute an integrated structure, which is embedded in the upper cover body 10 and covered by the upper cover body 10. Figures 4 to 6As shown; this design allows the first check valve plate structure 14, the second check valve plate structure 15, the first exhaust valve plate structure 16 and the adjustment valve plate structure 17 to be made on the same component, thereby simplifying their manufacturing process and their assembly process at the upper cover body 10. Specifically, Figures 4 to 6 As an example, the first check valve plate structure 14 and the first exhaust valve plate structure 16 are also elastic, so that the first check valve plate structure 14 and the first exhaust valve plate structure 16 can automatically reset with the help of elastic force.
[0033] like Figure 6 As shown, the first embodiment of the integrated inflation and exhaust pump 100 for the sphygmomanometer also includes a second exhaust channel 90a and a second exhaust valve 90b. The second exhaust channel 90a is formed at the upper cover body 10, the base plate 20 and the lower shell 30, and the second exhaust channel 90a is also connected to the first air chamber 11 to meet the need for the first air chamber 11 to be connected to the second exhaust channel 90a. The second exhaust valve 90b is installed on the upper cover body 10, and the upper cover body 10 provides support for the second exhaust valve 90b. Among them, when the connecting rod mechanism 50 is driven to rise by the rotary driver 40, the second exhaust valve 90b is linked to close the second exhaust channel 90a to meet the inflation need of the integrated inflation and exhaust pump 100 for the sphygmomanometer of the first embodiment; when the connecting rod mechanism 50 is driven to descend by the rotary driver 40, the second exhaust valve 90b is linked to open the second exhaust channel 90a to meet the normal exhaust need of the integrated inflation and exhaust pump 100 for the sphygmomanometer of the first embodiment. Specifically, Figure 6 As an example, the second exhaust passage 90a connected to the first air chamber 11 includes two upper and lower sections 91 extending in the up-down direction of the upper cover body 10 and a lateral extension section 92 extending from the side of the upper cover body 10, and the lateral extension section 92 is connected between the two upper and lower sections 91. This design reduces the space occupied by the second exhaust passage 90a in the up-down direction of the upper cover body 10; optionally, as an example, the second exhaust valve 90b is used to close an upper and lower section 91 below, and the state is shown in FIG. Figure 6 In addition, the external connection channel 13 is arranged to extend upward along the vertical direction of the upper cover body 10 so that the external connection channel 13 is exposed to the outside from the top of the upper cover body 10 .
[0034] Combination Figures 4 to 6, the inflation and deflation process of the integrated inflation and exhaust pump for sphygmomanometer of the first embodiment is described as follows: during inflation, the rotary driver 40 drives the airbag 32 to perform telescopic movement through the connecting rod mechanism 50, and the rotary driver 40 also drives the connecting rod mechanism 50 to rise upward, and the rising connecting rod mechanism 50 links the second exhaust valve 90b to close the second exhaust channel 90a. The telescopic airbag 32 inhales gas, and the inhaled gas pushes the first check valve plate structure 14 to enter the first air chamber 11; most of the gas entering the first air chamber 11 enters the second air chamber 12 by pushing the second check valve plate structure 15, and a small part of the gas entering the first air chamber 11 flows away through the leakage channel 70; because the air pressure in the first air chamber 11 is greater than the air pressure in the second air chamber 12, the first exhaust valve plate structure 16 closes the connection between the first exhaust channel 60 and the second air chamber 12, so that the gas in the second air chamber 11 flows away through the external channel 13, and the inflation of the integrated inflation and exhaust pump 100 for sphygmomanometer of the first embodiment is achieved.
[0035] During normal deflation, the rotary driver 40 drives the connecting rod mechanism 50 to descend, and the descending connecting rod mechanism 50 drives the second exhaust valve 90b to open the second exhaust channel 90a, so that the gas in the first air chamber 11 is quickly discharged by the second exhaust channel 90a, so that the air pressure in the first air chamber 11 is quickly lower than the air pressure in the second air chamber 12, and then the first exhaust valve 16 opens the connection between the second air chamber 12 and the first exhaust channel 60, and the gas in the second air chamber 12 is discharged by the first exhaust channel 60, thereby achieving the normal exhaust purpose of the integrated inflation and exhaust pump 100 for the sphygmomanometer of the first embodiment.
[0036] In the event of a power failure, since the second exhaust valve 90b is in a state of closing the second exhaust channel 90a, the gas in the first air chamber 11 is discharged through the leakage channel 70; when the air pressure in the first air chamber 11 is lower than that in the second air chamber 12, the first exhaust valve plate structure 16 connects the second air chamber 12 with the first exhaust channel 60, so that the gas in the second air chamber 12 is discharged through the first exhaust channel 60.
[0037] See also Figures 7 to 9 The structure of the integrated inflation and exhaust pump 100 'for a sphygmomanometer in the second embodiment is basically the same as that of the integrated inflation and exhaust pump 100 for a sphygmomanometer in the first embodiment, and the differences are as follows:
[0038] In the integrated inflation and exhaust pump 100' for a sphygmomanometer of the second embodiment, there is no second check valve plate structure 15 for preventing the gas in the second air chamber 12 from flowing back to the first air chamber 11; at the same time, its second exhaust channel 90a' is connected to the second air chamber 12 and extends along the upper and lower directions of the upper cover body 10; this design makes it possible for the integrated inflation and exhaust pump 100' for a sphygmomanometer of the second embodiment to not rely on the first exhaust channel 60 during normal exhaust. Furthermore, in the integrated inflation and exhaust pump 100' for a sphygmomanometer of the second embodiment, a third air chamber 21 is provided on the lower shell 20, and the third air chamber 21 is connected between the first air chamber 11 and the second air chamber 12, so that the gas in the first air chamber 11 can flow to the second air chamber 12 through the third air chamber 21, and a third check valve plate structure 311 is provided on the substrate 31 for blocking the gas in the third air chamber 21 from flowing back to the first air chamber 11, so that a buffering effect is achieved with the help of the third check valve plate structure 311 and the third air chamber 21, thereby making the airflow of the integrated inflation and exhaust pump 100' for a sphygmomanometer of the second embodiment more stable.
[0039] Except for the above differences, the other parts are the same as those of the first embodiment, so they will not be described in detail here. It is worth noting that, according to actual needs, the third air chamber 21 can also be transferred to the integrated inflation and exhaust pump 100 for the sphygmomanometer of the first embodiment, that is, the lower housing 20 in the integrated inflation and exhaust pump 100 for the sphygmomanometer of the first embodiment can also be provided with the third air chamber 21, so it is not limited to the figure shown.
[0040] Compared with the prior art, with the help of a first exhaust channel 60 formed at the upper cover body 10 and the substrate 31 and connected to the second air chamber 12, and a leakage channel 70 formed at the upper cover body 10 and connected to the first air chamber 11, and an abnormal exhaust valve plate 16 structure for opening and closing the connection between the second air chamber 12 and the first exhaust channel 60 is provided in the first air chamber 11; therefore, in the event of a power failure, at this time, the gas in the first air chamber 11 can flow away through the leakage channel 70, so that the air pressure of the first air chamber 11 is lower than the air pressure of the second air chamber 12. When the air pressure of the second air chamber 12 is lower than the air pressure of the first air chamber 11, the first exhaust valve plate structure 16 at this time opens the connection between the first exhaust channel 60 and the second air chamber 12, so that the gas entering the second air chamber 12 from the external channel 13 is discharged by the first exhaust channel 60, thereby achieving the purpose of normal exhaust of the integrated inflation and exhaust pump 100 (100') for a sphygmomanometer of the utility model under a power failure. Because the integrated inflation and exhaust pump 100 (100') for the sphygmomanometer of the utility model can achieve normal exhaust in the event of a power failure by virtue of the cooperation of the leakage channel 70, the first exhaust channel 60 and the first exhaust valve plate structure 16, the integrated inflation and exhaust pump 100 (100') for the sphygmomanometer of the utility model has the advantage of low cost.
[0041] It is worth noting that the direction indicated by the arrow A in the accompanying drawings is from the upper cover body 10 from bottom to top. In addition, the air leakage channel 70 is a trapezoid, such as but not limited to an isosceles trapezoid, and of course, it can also be a "V" shape. In addition, the first check valve plate structure 14, the second check valve plate structure 15, the first exhaust valve plate structure 16 and the third check valve plate structure 311 are also flexible. Combined with the above, it is obtained that the first check valve plate structure 14, the second check valve plate structure 15, the first exhaust valve plate structure 16 and the third check valve plate structure 311 are all flexible and elastic. However, the materials that realize the first check valve plate structure 14, the second check valve plate structure 15, the first exhaust valve plate structure 16 and the third check valve plate structure 311 are each flexible and elastic. It is well known in the art, so it is not repeated here.
[0042] The above disclosure is only a preferred example of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are all within the scope of the present invention.
Claims
1. An integrated inflation and exhaust pump for a sphygmomanometer, comprising an upper cover, a lower shell, a capsule having a substrate and an airbag, a rotary driver connected to the lower shell, and a connecting rod mechanism provided between the rotary driver and the airbag, wherein the substrate is sealingly installed between the upper cover and the lower shell, a first air chamber, a second air chamber communicating with the first air chamber, an external channel communicating with the second air chamber, and a first check valve sheet structure for blocking the gas in the first air chamber from flowing back to the airbag, the rotary driver drives the airbag to perform telescopic movement through the connecting rod mechanism, and is characterized in that: The integrated inflation and exhaust pump for the sphygmomanometer also includes a first exhaust channel and a leakage channel. The first exhaust channel is formed at the upper cover body and the substrate and is connected to the second air chamber. A first exhaust valve plate structure is provided in the first air chamber. The first exhaust valve plate structure closes the connection between the second air chamber and the first exhaust channel when the air pressure in the first air chamber is greater than the air pressure in the second air chamber. The first exhaust valve plate structure opens the connection between the second air chamber and the first exhaust channel when the air pressure in the first air chamber is less than the air pressure in the second air chamber. The leakage channel is formed at the upper cover body and is connected to the first air chamber. The gas in the first air chamber can flow away through the leakage channel to make the air pressure in the first air chamber lower than the air pressure in the second air chamber.
2. The integrated inflation and exhaust pump for a sphygmomanometer according to claim 1, characterized in that: It also includes an adjusting screw threadedly connected to the upper cover body and exposed to the outside. The upper cover body is provided with an adjusting valve plate structure for adjusting the opening size of the air leakage channel. The adjusting valve plate structure is arranged in linkage with the adjusting screw.
3. The integrated inflation and exhaust pump for a sphygmomanometer according to claim 2, characterized in that: The adjusting valve plate structure is located between the air leakage channel and the first air chamber and is arranged to extend along the side of the upper cover body to block the communication between the air leakage channel and the first air chamber. The adjusting valve plate structure is provided with a communication channel that connects the first air chamber with the air leakage channel. The adjusting screw is arranged to extend along the up and down directions of the upper cover body and is exposed to the outside from the top of the upper cover body. The adjusting screw is also located directly above the air leakage channel. The lower end of the adjusting screw is pushed and matched with the adjusting valve plate structure. The air leakage channel is exposed to the outside from the side of the upper cover body. The air leakage channel is trapezoidal or "V"-shaped.
4. The integrated inflation and exhaust pump for a sphygmomanometer according to claim 1, characterized in that: The first exhaust passage is also formed at the lower shell and is extended along the up-down direction of the upper cover.
5. The integrated inflation and exhaust pump for a sphygmomanometer according to claim 2, characterized in that: A second check valve structure for preventing the gas in the second air chamber from flowing back to the first air chamber is disposed in the upper cover.
6. The integrated inflation and exhaust pump for a sphygmomanometer according to claim 5, characterized in that: A third air chamber is provided on the lower shell body, and the third air chamber is connected between the first air chamber and the second air chamber so that the gas in the first air chamber flows to the second air chamber through the third air chamber. A third check valve plate structure is provided on the substrate for preventing the gas in the third air chamber from flowing back to the first air chamber.
7. The integrated inflation and exhaust pump for a sphygmomanometer according to claim 5, characterized in that: The first check valve plate structure, the second check valve plate structure, the first exhaust valve plate structure and the adjustment valve plate structure together form an integrated structure, and the integrated structure is embedded in the upper cover body and covered by the upper cover body.
8. The integrated inflation and exhaust pump for a sphygmomanometer according to claim 1, characterized in that: It also includes a second exhaust channel and a second exhaust valve, the second exhaust channel is formed at the upper cover body, the base plate and the lower shell body, the second exhaust channel is also connected to the first air chamber or the second air chamber, the second exhaust valve is installed at the upper cover body, and the connecting rod mechanism is driven to rise by the rotary driver to link the second exhaust valve to close the second exhaust channel, and the connecting rod mechanism is driven to descend by the rotary driver to link the second exhaust valve to open the second exhaust channel.
9. The integrated inflation and exhaust pump for a sphygmomanometer according to claim 8, characterized in that: The second exhaust channel connected to the first air chamber includes two upper and lower sections extending along the upper and lower directions of the upper cover body and a lateral extension section extending from the side of the upper cover body, and the lateral extension section is connected between the two upper and lower sections; the second exhaust channel connected to the second air chamber is extended and arranged along the upper and lower directions of the upper cover body.
10. The integrated inflation and exhaust pump for a sphygmomanometer according to claim 1, characterized in that: The external connection channel is arranged to extend upward along the up-down direction of the upper cover body.