CN217723493U

CN217723493U - Linear air leakage sealing piece, linear electromagnetic valve and sphygmomanometer

Info

Publication number: CN217723493U
Application number: CN202221500113.4U
Authority: CN
Inventors: 江沛杰; 李辉; 赵仲康
Original assignee: Shenzhen Sangtaida Technology Co ltd
Current assignee: Shenzhen Sangtaida Technology Co ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-11-04
Anticipated expiration: 2032-06-15

Abstract

The utility model belongs to the technical field of fluid delivery control and specifically relates to a linear air leakage seal spare, linear solenoid valve and sphygmomanometer are related to, its technical scheme main points lie in: the linear air leakage sealing device comprises a shell, an air nozzle, a coil, a framework, an inner core and a linear air leakage sealing element; the air nozzle is inserted on the shell, the framework is arranged in the shell, and one end of the air nozzle is arranged in the framework and is an air outlet end; the coil is wound on the framework, the inner core is arranged in the framework and connected with the framework in a sliding manner, and an exhaust port is formed in one end, close to the inner core, of the framework; the one end that the tuyere was kept away from to the inner core is provided with the stereoplasm air cock, and the inner wall fixed connection of stereoplasm air cock and inner core, the linear sealing member that loses heart sets up in the tip that the inner core is close to the tuyere, and the micropore that is linked together with the inner core is seted up to the stereoplasm air cock. The beneficial effect of this application does: the linear air leakage is stable, and the structure is stable.

Description

Linear air leakage sealing piece, linear electromagnetic valve and sphygmomanometer

Technical Field

The application relates to the field of fluid conveying control, in particular to a linear air leakage sealing piece, a linear electromagnetic valve and a sphygmomanometer.

Background

At present, the sphygmomanometer is generally matched with a linear valve to realize the functions of pressure relief or gas storage of an air bag of the sphygmomanometer. At present, linear valves are all solenoid valves, which are the basic elements of automation for controlling fluid.

The linear electromagnetic valve on the market comprises a coil, a rubber air nozzle, an inner core and an air nozzle, wherein the air outlet end of the air nozzle can be communicated with one end of the inner core, and the rubber air nozzle is arranged at the other end of the inner core. The outside cover of inner core is equipped with the spring, and the one end of spring is connected with the lateral wall of inner core, the other end and the tuyere fixed connection of spring. When the coil is powered off, a gap is formed between the inner core and the air nozzle under the action of the spring, and gas is quickly discharged from the gap; when the coil is electrified, the inner core overcomes the elasticity of the spring and is abutted against the air nozzle, and the air can only be discharged from the rubber air nozzle, so that the function of linear air leakage is achieved.

In the technology, the inventor finds that the linear air leakage function is realized by the rubber air nozzle, and the air passage in the rubber air nozzle can generate elastic deformation due to air pressure because the wall thickness of the rubber air nozzle is smaller than the width of the air passage of the rubber air nozzle, so that the linear air leakage stability is influenced.

SUMMERY OF THE UTILITY MODEL

The application provides a linear air leakage sealing member, linear solenoid valve and sphygmomanometer, has the stable advantage of linear air leakage.

The purpose of this application is to provide a linear run-flat seal, can realize through following technical scheme:

the utility model provides a linear air-tight seal, includes sealing portion, connecting portion and butt portion, the one end of connecting portion with sealing portion fixed connection, the other end of connecting portion with butt portion fixed connection, the tip of sealing portion once runs through connecting portion with miniature air flue has been seted up to butt portion, the diameter of miniature air flue is less than the minimum diameter of the linear sealing member of disappointing.

Through adopting above-mentioned scheme, the diameter setting of miniature air flue makes the structural strength of miniature air flue stronger, has improved the structural stability of miniature air flue to realize the stability that the linear sealing member that loses heart passes through miniature air flue. The arrangement of the connecting part and the abutting part enables the linear air leakage sealing piece to be more convenient to install.

Preferably, the ratio range of the diameter of the micro air channel to the diameter of the connecting part is set to be 1 (4-5).

Through adopting above-mentioned scheme, the diameter of miniature air flue sets up the structural stability who has both guaranteed miniature air flue with the diameter of connecting portion, has guaranteed the linear effect of disappointing again.

Preferably, a sealing ring is fixedly arranged on the end face, away from the connecting part, of the sealing part, and the cross section of the sealing ring is semicircular.

Through adopting above-mentioned scheme, setting up of sealing ring makes the linearity leak the leakproofness of sealing member and required sealed terminal surface higher, and when sealing ring and required sealed terminal surface butt, the sealing ring received the extrusion and takes place elastic deformation, has improved the leakproofness.

The second purpose of the application is to provide a linear electromagnetic valve, which is realized by the following technical scheme:

a linear electromagnetic valve comprises a shell, a tuyere, a coil, a framework, an inner core and the linear air leakage sealing element in the scheme; the air nozzle is fixedly inserted on the shell, the framework is arranged in the shell, and the air outlet end of the air nozzle is arranged in the framework; the coil is wound on the framework, the inner core is arranged in the framework, the inner core is connected with the framework in a sliding manner, and an exhaust port is formed in one end, close to the inner core, of the framework; the inner core is kept away from the one end of tuyere is provided with the stereoplasm air cock, the stereoplasm air cock with the inner wall fixed connection of inner core, the linear disappointing sealing member set up in the inner core is close to in the tip of tuyere, the linear disappointing sealing member is used for sealing the inner core with clearance between the tuyere, the micropore that is used for disappointing is seted up to the stereoplasm air cock, the micropore with the inner space of inner core is linked together, the micropore passes through the laser setting of punching.

Through adopting above-mentioned technical scheme, when the circular telegram of linear solenoid valve, the linear sealing member that loses heart can seal the clearance between inner core and the tuyere and make gaseous inside that can only get into the inner core through miniature air flue. Realize disappointing through the miniature air flue on the linear sealing member that loses heart and the micropore on the stereoplasm air cock, for the rubber air cock among the correlation technique, the stability of stereoplasm air cock is higher to it is more stable to make the linearity of linear solenoid valve lose heart, and the effect is better. The size of the micropore can be adjusted through the parameters of the laser, so that the linear air leakage time adjusting device is suitable for linear air leakage time with different requirements, and the applicability of the linear electromagnetic valve is improved.

Preferably, the hard air tap sleeve is provided with a sealing connecting piece, the inner surface of the sealing connecting piece is fixedly connected with the outer surface of the hard air tap, and the outer surface of the sealing connecting piece is fixedly connected with the inner surface of the inner core.

Through adopting above-mentioned scheme, sealing connection's setting has realized the fixed connection and the sealing of stereoplasm air cock and inner core for being connected of stereoplasm air cock and inner core is stable, and the leakproofness is good.

Preferably, the outer surface of the hard air tap is in interference fit with the inner surface of the sealing connecting piece, and the outer surface of the sealing connecting piece is in interference fit with the inner surface of the inner core.

By adopting the scheme, the sealing connecting piece is in interference fit with the hard air tap and the inner core, so that the hard air tap and the inner core are more stable in connection, and the sealing performance is better.

Preferably, the length of sealing connecting piece is greater than the length of stereoplasm air cock, sealing connecting piece cladding in the lateral wall of stereoplasm air cock, just sealing connecting piece be provided with be used for with the clearance of micropore intercommunication.

By adopting the technical scheme, the sealing connecting piece coats the hard air nozzle, so that the sealing connecting piece is more stably connected with the hard air nozzle, the sealing effect is better, and the communication between the micropores and the inner core inner space is ensured.

Preferably, the diameter of the sealing portion is greater than the inner diameter of the air inlet end of the inner core, the sealing portion is in interference fit with the air inlet end of the inner core, a first protrusion is arranged on the inner surface of the air inlet end of the inner core, the end face of the first protrusion is abutted against the side face of the connecting portion, the side face of the first protrusion is abutted against the end face of the sealing portion, and the first protrusion is in interference fit with the connecting portion.

Through adopting above-mentioned scheme, sealing and inner core inlet end interference fit make sealing and inner core internal surface realize sealing connection to the cooperation setting of first arch and connecting portion, butt portion has restricted the linear sealing member that loses heart including the ascending removal of axle direction, makes the linear sealing member that loses heart be connected with the inner core more stable, simultaneously more easy to assemble.

Preferably, a reset assembly is arranged between the air nozzle and the inner core, one end of the reset assembly is connected with the air nozzle, the other end of the reset assembly is connected with the inner core, and the reset assembly is used for separating the inner core from the air nozzle in a power-off state.

Through adopting above-mentioned scheme, the setting up of the subassembly that resets makes the inner core arrange the skeleton in under the outage state and keep away from the one end of tuyere to inner core and tuyere phase separation, thereby no longer sealed between inner core and the tuyere, gaseous space discharge between through inner core and tuyere accomplishes quick exhaust.

Preferably, the reset assembly is a spring, a second bulge is arranged on the outer surface of the inner core and connected with the inner wall of the framework in a sliding manner, a third bulge is arranged on the outer surface of one end, arranged in the framework, of the air nozzle, and the third bulge is abutted to the inner wall of the framework; one end of the spring is fixedly connected with the side surface of the second bulge, and the other end of the spring is fixedly connected with the side surface of the third bulge; in the de-energized state, the spring is in a natural state and in the energized state, the spring is in a compressed state.

By adopting the scheme, under the power-on state, the inner core is under the action of electromagnetic force to compress the spring, so that the space between the inner core and the air nozzle is sealed; after the outage, the spring reconversion, the inner core separates with the tuyere under the effect of spring, and the space between inner core and the tuyere is no longer sealed, and gaseous skeleton of discharging through this space is discharged from the gas vent of skeleton again to realize quick exhaust.

Preferably, the skeleton be used for with the terminal surface of inner core butt is provided with the fourth arch, the fourth arch be used for with the terminal surface butt of inner core, and it can supply the gas follow to wear to be equipped with on the fourth arch the inside passageway that leads to of skeleton the gas vent.

Through adopting above-mentioned scheme, when the spring was in natural state, the terminal surface and the protruding looks butt of fourth of inner core to set up the passageway that can supply the gas to pass through on the fourth arch, make the inside gas of skeleton can be discharged fast by this passageway, thereby improve quick carminative effect.

The third purpose of the application is to provide a sphygmomanometer, which is realized by the following technical scheme:

a sphygmomanometer comprises the linear electromagnetic valve.

Through adopting above-mentioned scheme, improve the accuracy nature that the sphygmomanometer measured blood pressure through promoting the stability that the linearity of linear solenoid valve is lost air.

To sum up, the beneficial technical effect of this application does:

1. the application provides a stable in structure of linear disappointing sealing member, the structural strength of miniature air flue is high for the linear effect of disappointing is stable, and the linear sealing member of disappointing is more stable, more firm with being connected of inner core simultaneously.

2. The application provides a linear solenoid valve adopts the stereoplasm air cock to accomplish linear disappointing, has increased the linear stability of disappointing of linear solenoid valve, guarantees the linear stable effect of disappointing.

3. The spring and the fourth bulge are arranged, so that rapid exhaust is smoother, and the rapid exhaust speed of the linear solenoid valve in the power-off state is ensured.

Drawings

FIG. 1 is a schematic view of a linear bleed seal configuration of the present application

Fig. 2 is a schematic view showing an assembly relationship of the linear solenoid valve of the present application.

Figure 3 is a cross-sectional view of the inner core of the present application.

Fig. 4 is a gas flow diagram in the present application with the linear solenoid valve energized.

Fig. 5 is a gas flow diagram in the present application with the linear solenoid valve de-energized.

Description of reference numerals:

1. a sealing part; 2. a connecting portion; 3. an abutting portion; 4. a micro air passage; 5. a seal ring; 6. a housing; 7. a tuyere; 8. a coil; 9. a framework; 10. an inner core; 11. a hard air tap; 12. a sealing connection; 13. a spring; 14. micropores; 15. mounting grooves; 16. a first protrusion; 17. a second protrusion; 18. a third protrusion; 19. an exhaust port; 20. a fourth protrusion; 21. a vent groove.

Detailed Description

The present application is described in further detail below in conjunction with fig. 1-5.

The application discloses a linear air-tight seal.

Referring to fig. 1, the linear run-flat seal includes a sealing portion 1, a connecting portion 2, and an abutting portion 3. In this embodiment, the seal portion 1 and the connection portion 2 are both provided in a cylindrical shape, and the abutting portion 3 is provided in a spherical shape. The sealing portion 1 is fixedly connected to the connecting portion 2, and the abutting portion 3 is fixedly connected to an end of the connecting portion 2 away from the sealing portion 1. The diameter of the sealing part 1 is larger than that of the connecting part 2; and the diameter of the abutting part 3 is larger than that of the connecting part 2, so that the linear air leakage sealing piece is more conveniently and stably installed in the electromagnetic valve. The end of the sealing part 1 sequentially penetrates through the connecting part 2 and the abutting part 3 to be provided with a micro air passage 4, and the micro air passage 4 is arranged in the axis direction of the linear air leakage sealing element. The micro air passage 4 is used for gas to pass through, and meanwhile, the micro air passage 4 can slow down the flow rate of the gas, so that the linear air leakage effect is realized.

The ratio range of the diameter of the micro air channel 4 to the diameter of the connecting part 2 is 1 (4-5), and in the embodiment, the ratio of the diameter of the micro air channel 14 to the diameter of the connecting part 2 is 1. The stability of the miniature air passage 4 is ensured through the setting of the proportion, and the linear air leakage effect of the miniature air passage 4 is ensured.

In order to enhance the sealing performance of the linear air leakage sealing piece, a sealing ring 5 is integrally formed on the end face of the sealing part 1, which is far away from the connecting part 2, the sealing ring 5 is made of rubber, the cross section of the sealing ring 5 is set to be circular or semicircular, and when the sealing ring 5 is abutted against the end face to be sealed, the sealing ring 5 is extruded to generate elastic deformation, so that the sealing performance of the sealing ring 5 is enhanced.

The application also discloses a linear solenoid valve.

Referring to fig. 2 and 3, the linear solenoid valve includes a housing 6, a tuyere 7, a coil 8, a bobbin 9, and an inner core 10. The tuyere 7 is fixedly inserted on the shell 6, and the framework 9 is arranged inside the shell 6. Coil 8 winding is on skeleton 9, and inner core 10 sets up and slides in skeleton 9 and with skeleton 9 and be connected, and skeleton 9 is close to the one end of inner core 10 and wears out casing 6 and has seted up gas vent 19, and inner core 10 is inside to be provided with stereoplasm air cock 11, wears to be equipped with micropore 14 on the stereoplasm air cock 11, and micropore 14 is used for limiting gas outgoing's speed. One end of the micropore 14 of the hard air tap 11 is communicated with the exhaust port 19, and the other end of the micropore 14 is communicated with the inside of the inner core 10. One end of the tuyere 7 close to the inner core 10 is an air outlet end, and the other end of the tuyere 7 is an air inlet end. The inner core 10 is communicated with the air outlet end of the tuyere 7.

The processing technology of the micropore 14 is laser drilling, so that the size of the micropore 14 can be adjusted by changing the parameters of laser, the micropore is suitable for linear air leakage time with different requirements, and the applicability of the novel linear electromagnetic valve is improved.

Fig. 4 and 5 show the gas flow diagram in the energized and de-energized states, respectively. When the linear electromagnetic valve is in a power-on state, the inner core 10 is abutted to the air outlet end of the air nozzle 7, and air enters the inner core 10 from the air outlet end of the air nozzle 7 and is discharged from the micropores 14 on the hard air nozzle 11, so that the linear air leakage effect is realized. Under the outage state, inner core 10 and tuyere 7 separate, and inner core 10 and tuyere 7 leave the clearance that can supply the gas to flow, and the gas gets into the back from tuyere 7, through between inner core 10 and the skeleton 9, discharges from the gas vent 19 of skeleton 9 at last to realize quick exhaust.

Specifically, referring to fig. 3, one end of the inner core 10 is an air inlet end, and the other end is an air outlet end. The air inlet end of the inner core 10 is arranged at one end close to the tuyere 7. The inner core 10 is provided with an installation groove 15 on the inner surface of the air outlet end, the hard air nozzle 11 is arranged in the installation groove 15, and a sealing connecting piece 12 is arranged between the hard air nozzle 11 and the installation groove 15. In this embodiment, the sealing connector 12 is made of rubber, and in other embodiments, the sealing connector 12 may be other sealing connectors 12 having elasticity. The sealing connecting piece 12 wraps the hard air tap 11, the outer wall of the sealing connecting piece 12 is abutted with the wall of the mounting groove 15, and the outer diameter of the sealing connecting piece 12 is larger than the diameter of the mounting groove 15, so that the sealing connecting piece 12 is in interference fit with the mounting groove 15, and stable sealing between the sealing connecting piece 12 and the mounting groove 15 is realized; the inner diameter of the sealing connecting piece 12 is smaller than the diameter of the hard air tap 11, so that the sealing connecting piece 12 is in interference fit with the hard air tap 11, and sealing between the sealing connecting piece 12 and the hard air tap 11 is realized. Therefore, when the linear solenoid valve is in the power-on state, the gas can only be discharged from the interior of the inner core 10 through the micropores 14 on the hard air nozzles 11, so as to achieve the linear air leakage effect.

The linear solenoid valve further comprises a linear air-leakage sealing element in the above embodiment, the linear air-leakage sealing element is arranged at the air inlet end of the inner core 10, the linear air-leakage sealing element is abutted to the inner surface of the air inlet end of the inner core 10, the diameter of the sealing part 1 is larger than the inner diameter of the air inlet end of the inner core 10, and the sealing part 1 of the linear air-leakage sealing element is in interference fit with the air inlet end of the inner core 10, so that the linear air-leakage sealing element is in sealing connection with the inner surface of the air inlet end of the inner core 10. And the internal surface of the air inlet end of inner core 10 is provided with first arch 16, the terminal surface of first arch 16 and the side butt of connecting portion 2, the side butt of first arch 16 and the terminal surface butt of sealing portion 1 to first arch 16 and connecting portion 2 interference fit improve the stability of being connected of linear disappointing sealing member and inner core 10. Since the diameter of the abutting portion 3 is larger than that of the connecting portion 2, the first protrusion 16 restricts the movement of the linear run-flat seal in the axial direction of the inner core 10, so that the connection of the linear run-flat seal with the inner core 10 is more stable.

Referring to fig. 4 and 5, the micro air duct 4 on the linear air leakage sealing member is coaxially arranged with the air outlet end on the tuyere 7. The sealing ring 5 is used for abutting against the end part of the air outlet end of the air nozzle 7, and the diameter of the sealing ring 5 is larger than the maximum diameter of the air outlet end of the air nozzle 7. When the air nozzle is in a power-on state, the sealing ring 5 is abutted against the end face of the air nozzle 7, so that the sealing ring 5 of the linear air leakage sealing element is sealed with the end face of the air nozzle 7, and air is limited from entering a space between the inner core 10 and the framework 9. In the power-off state, the sealing ring 5 is separated from the end face of the tuyere 7, and gas can enter the space between the inner core 10 and the framework 9 or the space between the tuyere 7 and the framework 9 from the air outlet end of the tuyere 7.

Referring to fig. 4 and 5, a reset assembly is arranged between the inner core 10 and the tuyere 7, and the reset assembly enables the inner core 10 to be arranged at one end of the framework 9 far away from the tuyere 7 in a power-off state, and the inner core 10 is separated from the tuyere 7. In this embodiment, the return assembly is a spring 13, and in other embodiments, the return assembly may have other structures that enable the inner core 10 to be disposed at an end of the framework 9 away from the tuyere 7. Specifically, the outer surface of the inner core 10 is fixedly provided with a second protrusion 17, and the inner core 10 is slidably inserted into the framework 9, so that the second protrusion 17 is slidably connected with the framework 9. The air inlet end of the air nozzle 7 is arranged outside the shell 6, the air outlet end of the air nozzle 7 is arranged inside the framework 9, a third bulge 18 is fixedly arranged on the outer surface of the air outlet end of the air nozzle 7, and the third bulge 18 is abutted to the inner surface of the framework 9. The spring 13 is sleeved on the inner core 10, one end of the spring 13 is fixedly connected with the side surface of the second protrusion 17, and the other end of the spring 13 is fixedly connected with the side surface of the third protrusion 18. The coil 8 is sleeved outside the framework 9. In a power-off state, the spring 13 is in a natural state, and the sealing ring 5 on the linear air-leakage sealing element is separated from the end face, close to the air outlet end, of the air nozzle 7, so that a gap for air to flow is formed between the sealing ring 5 and the end face, close to the air outlet end, of the air nozzle 7; in the power-on state, under the action of electromagnetic force, the second protrusion 17 compresses the spring 13, so that the inner core 10 overcomes the elastic force of the spring 13 and moves towards the direction of the tuyere 7, and the sealing ring 5 on the linear air-release sealing element is tightly abutted against the end surface of the tuyere 7, thereby sealing the space between the inner core 10 and the tuyere 7.

The second protrusion 17 and the third protrusion 18 are both provided with a vent groove 21 (as shown in fig. 2) for air to pass through between the inner core 10 and the framework 9 or between the tuyere 7 and the framework 9 and to be discharged from an exhaust port 19 of the framework 9. The framework 9 is used for being provided with the fourth arch 20 on the surface of the end butt of giving vent to anger with the inner core 10, and the fourth arch 20 is used for giving vent to anger the terminal surface butt of end with the inner core 10 to wear to be equipped with the passageway that can supply gas to lead to gas vent 19 from air channel 21 on the fourth arch 20, conveniently exhausts.

The implementation principle of the embodiment is as follows:

in a power-on state, the inner core 10 moves towards the tuyere 7 under the action of electromagnetic force, and the second protrusion 17 compresses the spring 13, so that the sealing ring 5 on the linear air leakage sealing element is abutted against the end face of the tuyere 7, and a space between the inner core 10 and the tuyere 7 is sealed. The air enters from the air nozzle 7, enters the inner core 10 through the micro air passage 4 of the linear air leakage sealing piece, and is finally discharged through the micropores 14 of the hard air nozzle 11, and the rate of gas discharge is limited by the micropores 14, so that the linear air leakage effect is realized. Under the outage state, spring 13 resumes natural state for sealing ring 5 on the linear sealing member that loses heart breaks away from the terminal surface of tuyere 7, has certain space between inner core 10 and the tuyere 7 and supplies gas to pass through, and gas enters the space between inner core 10 and the tuyere 7 from the end of giving vent to anger of tuyere 7 this moment, passes through the vent groove 21 of second arch 17 and third arch 18 again, discharges from the gas vent 19 of skeleton 9 at last, thereby accomplishes quick exhaust.

The application also discloses a sphygmomanometer.

The sphygmomanometer comprises the linear solenoid valve in the above embodiment. The linear electromagnetic valve is connected with a measuring air bag of the sphygmomanometer and used for controlling the air exhaust of the measuring air bag. When measuring blood pressure, linear solenoid valve is in the circular telegram state, measures the stable linear of gas in the gasbag and loses heart through linear solenoid valve to make sphygmomanometer's measurement more accurate. At the end of the measurement, the linear solenoid valve is in a power-off state, so that the gas in the measurement air bag is rapidly exhausted through the linear solenoid valve. This application promotes sphygmomanometer and measures the accurate nature of blood pressure through increasing the linear stability of disappointing of linear solenoid valve.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A linear air-tight seal, comprising: including sealing portion (1), connecting portion (2) and butt portion (3), the one end of connecting portion (2) with sealing portion (1) fixed connection, the other end of connecting portion (2) with butt portion (3) fixed connection, the tip of sealing portion (1) once runs through connecting portion (2) and miniature air flue (4) have been seted up in butt portion (3), the diameter of miniature air flue (4) is less than the linear minimum diameter of losing heart sealing member.

2. A linear vent seal in accordance with claim 1, wherein: the diameter of the micro air passage (4) and the diameter of the connecting part (2) are in a proportional range of 1 (4-5).

3. A linear vent seal in accordance with claim 2, wherein: the end face, deviating from the connecting part (2), of the sealing part (1) is fixedly provided with a sealing ring (5), and the cross section of the sealing ring (5) is semicircular.

4. A linear solenoid valve, characterized by: comprising a housing (6), a tuyere (7), a coil (8), a skeleton (9), an inner core (10) and a linear run-flat seal according to any of claims 1 to 3; the air nozzle (7) is fixedly inserted into the shell (6), the framework (9) is arranged inside the shell (6), and the air outlet end of the air nozzle (7) is arranged in the framework (9); the coil (8) is wound on the framework (9), the inner core (10) is arranged in the framework (9), the inner core (10) is connected with the framework (9) in a sliding mode, and an exhaust port (19) is formed in one end, close to the inner core (10), of the framework (9); keep away from inner core (10) the one end of tuyere (7) is provided with stereoplasm air cock (11), stereoplasm air cock (11) with the inner wall fixed connection of inner core (10), the linear sealing member that loses heart set up in inner core (10) are close to in the tip of tuyere (7), the linear sealing member that loses heart is used for sealing inner core (10) with clearance between tuyere (7), micropore (14) that are used for losing heart are seted up in stereoplasm air cock (11), micropore (14) with the inner space of inner core (10) is linked together, micropore (14) punch the setting through the laser.

5. A linear solenoid valve according to claim 4, characterised in that: the hard air nozzle (11) is sleeved with a sealing connecting piece (12), the inner surface of the sealing connecting piece (12) is fixedly connected with the outer surface of the hard air nozzle (11), and the outer surface of the sealing connecting piece (12) is fixedly connected with the inner surface of the inner core (10).

6. A linear solenoid valve according to claim 5, characterised in that: the outer surface of the hard air tap (11) is in interference fit with the inner surface of the sealing connecting piece (12), and the outer surface of the sealing connecting piece (12) is in interference fit with the inner surface of the inner core (10).

7. A linear solenoid valve according to claim 5, characterised in that: the length of sealing connecting piece (12) is greater than the length of stereoplasm air cock (11), sealing connecting piece (12) cladding in the lateral wall of stereoplasm air cock (11), just sealing connecting piece (12) be provided with be used for with the clearance of micropore (14) intercommunication.

8. A linear solenoid valve according to claim 4, characterised in that: the diameter of sealing (1) is greater than the inner diameter of inner core (10) inlet end, sealing (1) with the inlet end interference fit of inner core (10), the internal surface of the inlet end of inner core (10) is provided with first arch (16), the terminal surface of first arch (16) with the side looks butt of connecting portion (2), the side of first arch (16) with the terminal surface looks butt of sealing (1), and first arch (16) with connecting portion (2) interference fit.

9. A linear solenoid valve according to claim 4, characterised in that: a reset assembly is arranged between the air nozzle (7) and the inner core (10), one end of the reset assembly is connected with the air nozzle (7), the other end of the reset assembly is connected with the inner core (10), and the reset assembly is used for separating the inner core (10) from the air nozzle (7) in a power-off state.

10. A sphygmomanometer, characterized in that: comprising a linear solenoid valve according to any one of claims 4 to 9.