阅读说明：本技术 充排气一体式气泵以及包含该气泵的电子血压计 (Air inflation and exhaust integrated air pump and electronic sphygmomanometer comprising same ) 是由 杨海斌 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种充排气一体式气泵以及包含该气泵的电子血压计,包括电机、连接电机的缸体和安装于缸体中的连杆机构和送气装置,送气装置包括充气机构和排气机构,连杆机构连接并驱动送气装置,连杆机构具有第一驱动位和第二驱动位,在第一驱动位电机驱动连杆机构从而驱动充气机构实现充气过程；在第二驱动位电机驱动连杆机构从而驱动排气机构实现排气。因此,本发明的气泵整合了排气功能,可以实现充气与排气的切换,无需单独另设排气元件,零件少,结构简单。(The invention discloses an air charging and exhausting integrated air pump and an electronic sphygmomanometer comprising the air pump, and the air charging and exhausting integrated air pump comprises a motor, a cylinder body connected with the motor, and a connecting rod mechanism and an air supply device which are arranged in the cylinder body, wherein the air supply device comprises an air charging mechanism and an air exhausting mechanism; and the motor drives the link mechanism at the second driving position so as to drive the exhaust mechanism to exhaust. Therefore, the air pump integrates the exhaust function, can realize the switching of air inflation and air exhaust, does not need to separately arrange an exhaust element, and has few parts and simple structure.)

1. An air charging and exhausting integrated air pump comprises a motor, a cylinder body connected with the motor, and a connecting rod mechanism and an air supply device which are arranged in the cylinder body, and is characterized in that the air supply device comprises an air charging mechanism and an air exhausting mechanism, the connecting rod mechanism is connected with and drives the air supply device, the connecting rod mechanism is provided with a first driving position and a second driving position, and the motor drives the connecting rod mechanism at the first driving position so as to drive the air charging mechanism to realize an air charging process; and in the second driving position, the motor drives the connecting rod mechanism so as to drive the exhaust mechanism to exhaust.

2. The inflation and deflation integrated air pump of claim 1, wherein the inflation mechanism comprises a bag body and a cover body pressed on the bag body; the bag body comprises a base plate, a bag cavity with an upward opening, an air inlet groove and an air inflation groove, wherein the bag cavity, the air inlet groove and the air inflation groove are arranged on the base plate at intervals; the cover body comprises an inflatable column and an air inlet channel communicated with the air inlet groove and the bag cavity, and the inflatable column is provided with an air inflation channel communicated with the inflatable groove; when the stretched volume of the capsule cavity is increased, gas enters the gas inlet groove and enters the capsule cavity after passing through the gas inlet channel; when the volume of the bag cavity is reduced by compression, the gas in the bag cavity enters the inflation groove and then is inflated through the inflation channel.

3. The air inflation and exhaust integrated air pump according to claim 2, wherein the base plate has an upper surface recessed to form the air inflation groove, the bag cavity peripheral wall has a first positioning portion and an air inflation portion, and the air inflation portion is a thin wall formed at a connection of the bag cavity peripheral wall and the air inflation groove peripheral wall; the cover body protrudes downwards to form a first positioning plug, the first positioning plug is inserted into the bag cavity, the first positioning portion and the inflating portion are attached to the bag cavity and connected with the cover body and the bag body, and the peripheral wall of the first positioning plug is provided with the air inlet channel.

4. The air charging and discharging integrated air pump according to claim 2, wherein the upper surface of the base plate is recessed to form the air inlet groove, the peripheral wall of the air inlet groove is provided with a second positioning portion and an air inlet portion, and the air inlet portion is a thin wall formed at the connection of the peripheral wall of the bag cavity and the peripheral wall of the air inlet groove; the cover body protrudes downwards to form a second positioning plug, and the second positioning plug is inserted into the air inlet groove and is attached to the second positioning portion and the air inlet portion to be connected with the cover body and the bag body and form a closed space.

5. The air inflation and exhaust integrated air pump according to claim 1, wherein the exhaust mechanism comprises an ejector rod and a sealing seat arranged at the exhaust port, an elastic member for constantly sealing the sealing seat with the exhaust port is arranged on the sealing seat, in the first driving position, the elastic member constantly seals the sealing seat with the exhaust port, and the motor drives the link mechanism to drive the bag cavity to be stretched or compressed to realize air suction and exhaust of the bag cavity; in the second driving position, the motor drives the connecting rod mechanism so as to drive the ejector rod to overcome the elasticity of the elastic piece and push the sealing seat away to realize air exhaust.

6. The air charging and discharging integrated air pump according to claim 1, wherein the link mechanism is connected with a driving shaft of the motor through a limiting structure and an eccentric wheel matched with the limiting structure, and the switching between the first driving position and the second driving position is realized through the matching of the eccentric wheel and the limiting structure.

7. The air inflation and exhaust integrated air pump according to claim 6, wherein the limiting structure comprises a first driving part and a second driving part at different heights, and the height of the second driving part is higher than that of the first driving part; when the first driving part abuts against the eccentric wheel, the motor drives the connecting rod mechanism so as to drive the inflating mechanism to inflate; when the second driving part abuts against the eccentric wheel, the motor drives the connecting rod mechanism so as to drive the exhaust mechanism to exhaust.

8. The air pump as claimed in claim 7, wherein the first and second driving portions are connected to each other by an inclined surface, and when the eccentric needs to be switched between the first and second driving portions to be abutted, the eccentric is driven to move on the inclined surface by the rotation of the motor in different directions, so as to abut against the first or second driving portion.

9. The air pump as claimed in claim 1, wherein the link mechanism comprises a mounting plate and a coupling shaft fixedly coupled to the mounting plate, the air supply device is fixedly coupled to the mounting plate, and the motor drives the coupling shaft and the mounting plate to drive the air supply device.

10. An electronic blood pressure meter comprising the inflation and deflation integrated air pump according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of pumps, in particular to an air inflation and exhaust integrated air pump and an electronic sphygmomanometer comprising the same.

Background

The miniature air pump is a pump with reduced volume, and is widely applied to the technical fields of medical instruments and the like. The miniature air pump is an essential component of the electronic sphygmomanometer. The electronic sphygmomanometer generally includes a pressurized air pump, an exhaust solenoid valve, an air pressure sensor, and the like. The pressurizing air pump is used for inflating and pressurizing, the blood pressure is measured in the pressurizing process or after the pressurizing is stopped, the exhaust electromagnetic valve is closed in the measuring process, and the exhaust electromagnetic valve is opened to exhaust air quickly after the measuring is finished. The air pump of the general electronic sphygmomanometer only has an air inflation function, and an air exhaust electromagnetic valve is required to be additionally arranged to complete an air deflation process.

Therefore, the air pump of the conventional electronic sphygmomanometer does not have an air exhaust function, and an air exhaust solenoid valve is required to be additionally arranged, the volume of the electronic sphygmomanometer depends on the volume of each component, the additional air exhaust solenoid valve causes more parts, large occupied space, high production cost and complex assembly, and the volume of the air pump and the volume of the electronic sphygmomanometer are increased to a certain extent by a plurality of parts.

In order to solve the problems, the invention provides an air inflation and exhaust integrated air pump and an electronic sphygmomanometer comprising the air pump.

Disclosure of Invention

The invention aims to provide an air inflation and exhaust integrated air pump and an electronic sphygmomanometer comprising the same.

In order to achieve the purpose, the invention provides an air charging and exhausting integrated air pump which comprises a motor, a cylinder body connected with the motor, and a connecting rod mechanism and an air supply device which are arranged in the cylinder body, wherein the air supply device comprises an air charging mechanism and an air exhausting mechanism; and the motor drives the link mechanism at the second driving position so as to drive the exhaust mechanism to exhaust.

Compared with the prior art, the air supply device of the air charging and discharging integrated air pump comprises an air charging mechanism and an air discharging mechanism, wherein the connecting rod mechanism is connected with and drives the air supply device, the connecting rod mechanism is provided with a first driving position and a second driving position, and a motor drives the connecting rod mechanism at the first driving position so as to drive the air charging mechanism to realize an air charging process; and the motor drives the link mechanism at the second driving position so as to drive the exhaust mechanism to exhaust. Therefore, the air pump integrates the air exhaust function, can realize the switching of air inflation and air exhaust, and does not need to be separately provided with an air exhaust element.

Specifically, the inflation mechanism comprises a bag body and a cover body pressed on the bag body; the bag body comprises a substrate, a bag cavity with an upward opening, an air inlet groove and an air charging groove, wherein the bag cavity, the air inlet groove and the air charging groove are arranged on the substrate at intervals; the cover body comprises an inflatable column and an air inlet channel communicated with the air inlet groove and the bag cavity, and the inflatable column is provided with an inflatable channel communicated with the inflatable groove; when the stretched volume of the bag cavity is increased, the gas enters the gas inlet groove and enters the bag cavity after passing through the gas inlet channel; when the volume of the bag cavity is reduced by compression, the gas in the bag cavity enters the inflation groove and then is inflated through the inflation channel.

Specifically, an inflation groove is formed in the lower surface of the substrate in a concave mode, a first positioning portion and an inflation portion are arranged on the peripheral wall of the bag cavity, and the inflation portion is a thin wall formed at the connecting portion of the peripheral wall of the bag cavity and the peripheral wall of the inflation groove; the lid is protruding to stretch downwards and is formed first locating plug, thereby first locating plug inserts and locates the laminating of bag chamber and first locating part and inflation portion and connect lid and utricule, has seted up the intake duct on the periphery wall of first locating plug.

Specifically, the upper surface of the substrate is recessed to form an air inlet groove, the peripheral wall of the air inlet groove is provided with a second positioning part and an air inlet part, and the air inlet part is a thin wall formed at the joint of the peripheral wall of the bag cavity and the peripheral wall of the air inlet groove; the cover body protrudes downwards to form a second positioning plug, and the second positioning plug is inserted into the air inlet groove, attached to the second positioning portion and the air inlet portion, is connected with the cover body and the bag body and forms a closed space.

Specifically, the exhaust mechanism comprises a push rod and a sealing seat arranged at the exhaust port, an elastic part which enables the sealing seat to seal the exhaust port constantly is arranged on the sealing seat, the elastic part enables the sealing seat to seal the exhaust port constantly at the first driving position, and the motor drives the connecting rod mechanism so as to drive the bag cavity to be stretched or compressed to realize air suction and exhaust of the bag cavity; in the second driving position, the motor drives the connecting rod mechanism to drive the push rod to overcome the elasticity of the elastic piece and push the sealing seat open to exhaust.

Specifically, the link mechanism is connected with a driving shaft of the motor through a limiting structure and an eccentric wheel matched with the limiting structure, and switching between the first driving position and the second driving position is achieved through matching of the eccentric wheel and the limiting structure.

Specifically, the limiting structure comprises a first driving part and a second driving part which are positioned at different heights, and the height of the second driving part is higher than that of the first driving part; when the first driving part is abutted against the eccentric wheel, the motor drives the connecting rod mechanism so as to drive the inflating mechanism to inflate; when the second driving part abuts against the eccentric wheel, the motor drives the connecting rod mechanism so as to drive the exhaust mechanism to exhaust.

Specifically, the first driving part and the second driving part are in transitional connection through an inclined plane, and when the eccentric wheel needs to be switched to be abutted between the first driving part and the second driving part, the eccentric wheel is driven to move on the inclined plane through rotation of the motor in different directions, so that the eccentric wheel is abutted against the first driving part or the second driving part.

Specifically, the link mechanism comprises a mounting plate and a connecting shaft fixedly connected with the mounting plate, the air supply device is fixedly connected onto the mounting plate, and the motor drives the air supply device by driving the connecting shaft and the mounting plate.

The invention also provides an electronic sphygmomanometer comprising the air inflation and exhaust integrated air pump.

Drawings

Fig. 1 is a schematic structural view of an embodiment of an inflation/deflation integrated air pump of the present invention.

Fig. 2 is an exploded view of the inflation and deflation integrated air pump shown in fig. 1.

Fig. 3 is an exploded view of another angle of the inflation and deflation integrated air pump shown in fig. 1.

Fig. 4 is a sectional view of the inflation and deflation integrated air pump shown in fig. 1.

Fig. 5 is a partial structural schematic view of the inflation and deflation integrated air pump shown in fig. 1 after the motor and the cylinder are hidden in the first driving position.

Fig. 6 is a cross-sectional view of fig. 5.

Fig. 7 is a partial structural schematic view of the inflation and deflation integrated air pump shown in fig. 1 after the motor and the cylinder are hidden in the second driving position.

Fig. 8 is a cross-sectional view of fig. 7.

FIG. 9 is a schematic structural view of another embodiment of an inflation mechanism.

FIG. 10 is a schematic view of another angle of the inflation mechanism of FIG. 9.

Description of the symbols

An inflation/deflation integrated air pump 100; a motor 1; a drive shaft 11; a cylinder body 2; a screw 21; a positioning groove 22; an engaging portion 23; a link mechanism 3; a mounting plate 31; a mounting hole 311; mounting notches 312; a recess 313; a coupling shaft 32; a limiting structure 33; the first driving portion 331; the second driving portion 332; an inclined surface 333; a limiting part 335; an eccentric wheel 34; an air supply device 4; an inflation mechanism 41; a capsule body 410; a substrate 411; a capsule cavity 412; a first positioning portion 4121; an inflation portion 4122; a notch 4123; an air inlet duct 413/413'; a second positioning portion 4131; an intake portion 4132; an inflation channel 414; an air inlet 415; an intake valve plate 416; a sealing rib 417; a first positioning notch 418; a cover 430; an air column 431; an inlet duct 432; an air charging duct 433; a first positioning plug 434; a locating member 435; a second positioning plug 436; a fixed seat 440; an intake hole 441; the accommodation hole 442; the second positioning notches 443; the exhaust mechanism 42; an exhaust port 421; a pusher rod 422; a seal seat 423; the elastic member 424; positioning boss 425

Detailed Description

In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.

Referring to fig. 1-4, the present invention provides an air pump 100 with integrated air charging and discharging functions, which includes a motor 1, a cylinder 2 connected to the motor 1, a link mechanism 3 installed in the cylinder 2, and an air supply device 4. The air supply device 4 includes an inflation mechanism 41 and an exhaust mechanism 42, and the link mechanism 3 is connected to and drives the inflation mechanism 41 or the exhaust mechanism 42. The link mechanism 3 is provided with a first driving position and a second driving position, and the motor 1 drives the link mechanism 3 at the first driving position so as to drive the inflating mechanism 41 to realize an inflating process; in the second driving position, the motor 1 drives the link mechanism 3 to drive the exhaust mechanism 42 to exhaust. The upper end of the motor 1 is in threaded connection with the lower end of the cylinder body 2, specifically, a threaded hole is formed in the upper end of the motor 1, and a screw 21 is fixed at the lower end of the cylinder body 2. Of course, the connection mode of the motor 1 and the cylinder 2 is not limited to the threaded connection, for example, the motor 1 and the cylinder 2 may be connected by welding or by a snap-fit connection mode, a snap groove is formed on the housing of the motor 1, and a snap hook is arranged on the cylinder 2 and connected by the snap hook and the snap groove.

Referring again to fig. 2-4, inflation mechanism 41 includes a bladder 410 and a cover 430 crimped to bladder 410. The bag body 410 comprises a base plate 411, a bag cavity 412 with an upward opening, an air inlet groove 413 and an inflation groove 414, wherein the bag cavity 412, the air inlet groove 413 and the inflation groove 414 are arranged on the base plate 411 at intervals. The cover 430 includes an inflation column 431 for inflation and an air inlet channel 432 communicating the air inlet groove 413 and the pocket 412, and the inflation column 431 has an inflation channel 433 communicating with the inflation groove 414 for inflation. More specifically, an air inlet groove 413 is formed by recessing the upper surface of the base plate 411, an air inlet 415 is formed at the bottom of the air inlet groove 413, and an air inlet valve plate 416 is arranged at the air inlet 415. Preferably, the upper surface of the base plate 411 is recessed to form the inflation groove 414, the peripheral wall of the bag cavity 412 is provided with a first positioning portion 4121 and an inflation portion 4122, and the inflation portion 4122 is a thin wall formed at the connection position of the peripheral wall of the bag cavity 412 and the peripheral wall of the inflation groove 414. The cover 430 protrudes downward to form a first positioning plug 434, and the first positioning plug 434 is inserted into the bag cavity 412 to be attached to the first positioning portion 4121 and the inflating portion 4122 so as to connect the cover 430 and the bag body 410. Specifically, the lower surface of the cover 430 and the outer peripheral wall of the first positioning plug 434 are provided with an air inlet channel 432, and the L-shaped slot of the air inlet channel 432 is communicated with the bag cavity 412 and the air inlet groove 413. Preferably, the inflating mechanism 41 further includes a fixing seat 440 for fixing the bladder 410, the fixing seat 440 has an air inlet hole 441 and a receiving hole 442, and the air inlet hole 441 is opposite to the air inlet valve plate 416. Under the driving of the motor 1, the link mechanism 3 stretches the capsule 410 downwards, the volume of the capsule 412 is increased, the air pressure in the capsule 412 is reduced, the air inlet valve plate 416 is opened, and the outside air enters the air inlet groove 413 through the air inlet hole 441 and the air inlet 415 and enters the capsule 412 through the air inlet channel 432; when the link mechanism 3 presses the bladder body 410 upward, the volume of the bladder cavity 412 is reduced, the intake valve plate 416 is closed, the peripheral wall of the inflation portion 4122 and the first positioning plug 434 is separated, and the gas in the bladder cavity 412 is exhausted through the inflation groove 414 and the inflation channel 433 through the inflation portion 4122 for inflation. Therefore, the air supply device 4 does not need to be provided with an air supply valve sheet, and the inflation portion 4122 functions as a valve sheet, and therefore, the number of parts is small and the structure is simple.

Referring to fig. 2-8, the link mechanism 3 includes a mounting plate 31, a connecting shaft 32 fixedly connected to the mounting plate 31, and a limiting structure 33, wherein the mounting plate 31 is provided with a mounting hole 311 having a mounting notch 312. The lower end of the bag cavity 412 is inserted into the receiving hole 442 of the fixing seat 440 and is installed in the installation hole 311 of the installation plate 31 from the installation notch 312, and the installation notch 312 is provided to facilitate the installation of the bag body 410. Preferably, there are a plurality of the capsule cavities 412, and accordingly, there are a plurality of the accommodation holes 442, the air inlet holes 441, the air inlets 415, and the air inlet grooves 413, and there are 3 air inlet holes, as shown in fig. 2 and 3, but not limited thereto. Further, the link mechanism 3 is connected with the driving shaft 11 of the motor 1 through a limiting structure 33 and an eccentric wheel 34 matched with the limiting structure 33, and the switching between the first driving position and the second driving position is realized through the matching of the eccentric wheel 34 and the limiting structure 33. Specifically, the limiting structure 33 includes a first driving portion 331 and a second driving portion 332 at different heights, the second driving portion 332 is higher than the first driving portion 331, and the first driving portion 331 and the second driving portion 332 are transitionally connected by an inclined surface 333. Preferably, the position-limiting structure 33 is a cylinder protruding with a position-limiting portion 335, two side surfaces of the position-limiting portion 335 are a first driving portion 331 and a second driving portion 332, respectively, and the first driving portion 331 and the second driving portion 332 are connected by an inclined surface 333. When the first driving part 331 abuts against the eccentric wheel 34 and is in the first driving position, the motor 1 drives the connecting rod mechanism 3 to move up and down to stretch or compress the bag cavity 412, so that inflation is realized; when the second driving portion 332 abuts against the eccentric wheel 34 and is in the second driving position, the motor 1 drives the link mechanism 3 to drive the exhaust mechanism 42 to exhaust. When the eccentric 34 needs to switch the abutment between the first driving portion 331 and the second driving portion 332, the eccentric 34 is driven to move on the inclined surface 333 by the rotation of the motor 1 in different directions, thereby abutting the first driving portion 331 or the second driving portion 332.

Referring to fig. 2-4, 6 and 8 again, the exhaust port 421 of the exhaust mechanism 42 is opened at the bottom of the inflation groove 414, the exhaust mechanism 42 includes a push rod 422 and a sealing seat 423 disposed at the exhaust port 421, and an elastic member 424 for constantly sealing the sealing seat 423 with the exhaust port 421 is disposed on the sealing seat 423. Further, the middle portion of the mounting plate 31 has a recess 313, and the bottom of the ejector rod 422 is received in the recess 313, so that the link mechanism 3 and the ejector rod 422 are reliably connected. The upper surface of the sealing seat 423 protrudes with a positioning protrusion 425, the elastic member 424 is a spring, and the spring is sleeved on the positioning protrusion 425 and is pressed between the sealing seat 423 and the top of the inflation groove 414. When the first driving part 331 abuts against the eccentric wheel 34, the link mechanism 3 is in a low position, the elastic member 424 constantly enables the sealing seat 423 to seal the exhaust port 421, and the motor 1 drives the link mechanism 3 so as to drive the bag cavity 412 to be stretched or compressed to realize air suction and exhaust of the bag cavity 412; when the motor 1 rotates reversely, the eccentric wheel 34 moves along the inclined surface 333 until the second driving portion 332 abuts against the eccentric wheel 34, the link mechanism 3 is in the high position, and the motor 1 drives the link mechanism 3 to drive the ejector rod 422 to overcome the elastic force of the elastic member 424, so as to push the seal seat 423 away for air exhaust.

As shown in fig. 2, the upper surface of the base 411 of the capsule 410 is provided with a protruding sealing rib 417, and the cover 430 is pressed against the sealing rib 417 so that the cavity 412, the air inlet groove 413 and the air charging groove 414 form independent spaces. Referring to fig. 2-4, the positioning member 435 is disposed on the peripheral wall of the cover 430, the first positioning notch 418 and the second positioning notch 443 are respectively disposed on the peripheral edges of the base 411 and the fixing base 440 of the capsule 410, the positioning groove 22 is disposed on the peripheral wall of the cylinder 2, the engaging portion 23 is disposed in the positioning groove 22, and the positioning member 435 is inserted into the positioning notches of the capsule 410 and the fixing base 440 and is engaged with the engaging portion 23, so as to fix the cover 430, the capsule 410, the fixing base 440 and the cylinder 2. The air inlet holes 441 are communicated with the outside through the positioning grooves 22.

Therefore, when air is required, the eccentric 34 abuts against the first driving portion 331, in the first driving position, and the motor 1 drives the link mechanism 3, so that the plurality of pockets 412 are sequentially stretched or compressed. When the capsule 412 is stretched, the volume of the capsule 412 is increased, the air inlet valve plate 416 is opened, and the outside air passes through the positioning groove 22, the air inlet hole 441, the air inlet 415, the air inlet groove 413 and the air inlet channel 432 and then enters the capsule 412. When the bag chamber 412 is compressed, the volume of the bag chamber 412 is reduced, the air inlet valve plate 416 is closed, the peripheral walls of the inflation portion 4122 and the first positioning plug 434 are separated under the blowing of the air flow, and the air in the bag chamber 412 is exhausted through the inflation portion 4122 through the inflation groove 414 and the inflation channel 433 for inflation. When the exhaust is needed, the motor 1 rotates reversely, the eccentric wheel 34 moves along the inclined plane, the eccentric wheel 34 abuts against the second driving part 332, the link mechanism 3 is in the high position, the motor 1 drives the link mechanism 3, so as to drive the ejector rod 422 to overcome the elastic force of the elastic member 424, and push open the sealing seat 423, so that the gas is discharged from the gas outlet 421 through the gas charging channel 433 and the gas charging groove 414 and further through the positioning groove 22 part of the cylinder body 2 (i.e. the passage through which the outside gas enters).

Fig. 9 to 10 show another embodiment of the inflating mechanism 41, in which an air inlet groove 413 ' is formed by recessing the upper surface of the base plate 411, the peripheral wall of the air inlet groove 413 ' has a second positioning portion 4131 and an air inlet portion 4132, and the air inlet portion 4132 is a thin wall formed at the junction of the peripheral wall of the bag chamber 412 and the peripheral wall of the air inlet groove 413 '. The cover 430 protrudes downwards to form a second positioning plug 436, and the second positioning plug 436 is inserted into the air inlet groove 413' to be attached to the second positioning portion 4131 and the air inlet portion 4132, so as to connect the cover 430 and the capsule 410 and form a closed space. As can be understood, the intake portion 4132 functions as an intake valve plate. Preferably, a notch 4123 is formed in the peripheral wall of the bag chamber 412 adjacent to the air intake portion 4132 to facilitate separation of the air intake portion 4132 from the second positioning plug 436. When the volume of the bag chamber 412 is increased by stretching, the internal gas pressure is reduced, and when the external gas enters the gas inlet groove 413', the gas inlet portion 4132 is separated from the peripheral wall of the second positioning plug 436 by the gas, and the gas enters the bag chamber 412. In this embodiment, except for the above structure, other structures are the same as those in the previous embodiment, and are not described herein again.

The invention also provides an electronic sphygmomanometer comprising the air inflation and exhaust integrated air pump 100. Specifically, the inflation column 431 of the air pump 100 is connected to the air bag, the pressure sensor and the slow air leakage valve (the slow air leakage valve is not required for the sphygmomanometer adopting the boost type measurement mode), so that an airtight system of the electronic sphygmomanometer is formed. Other structures of electronic blood pressure meters are well known and will not be described herein.

In summary, the air supply device 4 of the air pump 100 of the present invention includes an air charging mechanism 41 and an air discharging mechanism 42, the link mechanism 3 is connected to and drives the air supply device 4, the link mechanism 3 has a first driving position and a second driving position, and the motor 1 drives the link mechanism 3 at the first driving position to drive the air charging mechanism 41 to realize an air charging process; in the second driving position, the motor 1 drives the link mechanism 3 to drive the exhaust mechanism 42 to exhaust. Therefore, the inflation and exhaust integrated air pump 100 of the present invention integrates the exhaust function, and can realize the switching between inflation and exhaust without separately arranging an exhaust element. A large amount of spaces can be saved in the internal structure of the electronic sphygmomanometer with the air inflation and exhaust integrated air pump, the arrangement of other parts of the electronic sphygmomanometer is convenient, the size can be reduced, the space can be saved, the material and the cost can be saved, and the assembly of an exhaust valve and the like can be reduced.

The above disclosure is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, so that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.