CN113431949A

CN113431949A - Miniature proportional valve

Info

Publication number: CN113431949A
Application number: CN202110862888.XA
Authority: CN
Inventors: 张�成; 柳锦
Original assignee: Shenzhen Keyto Fluid Control Co ltd
Current assignee: Shenzhen Keyto Fluid Control Co ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-09-24

Abstract

The invention relates to the technical field of gas flow control, and discloses a miniature proportional valve, which comprises: a housing; the sleeve is arranged at one end of the shell; the valve head is arranged at one end of the sleeve, which is far away from the shell, and is used for the circulation of gas; the sealing assembly is provided with a pilot hole and is used for sealing the valve head at high pressure; the prepressing structure is arranged in the sleeve and used for providing prepressing force for the sealing assembly; and the electromagnet assembly is arranged in the shell, is communicated with the pilot hole and is used for providing electromagnetic force for the sealing assembly so as to control the opening degree of the valve port of the proportional valve. The invention is resistant to high pressure and realizes the proportional adjustment of gas flow under high pressure.

Description

Miniature proportional valve

Technical Field

The invention relates to the technical field of gas flow control, in particular to a miniature proportional valve.

Background

Electromagnetic valve: the valves are divided into two types according to the control mode of the carrier, one type is ON/OFF control, namely ON/OFF, either full-ON or full-OFF, and the flow rate is either available or unavailable without intermediate states, such as common electromagnetic switch valves, electromagnetic reversing valves and electro-hydraulic reversing valves. The other is continuous control, the valve port can be opened by any opening degree according to requirements, so as to control the passing flow, and the valve is manually controlled, such as a throttle valve; there are also electrically controlled, e.g. proportional valves, servo valves.

In the prior art, breathing machines require more and more first-aid transfer breathing machines, and the transfer breathing machines are convenient, so that the back pressure requirement of the transfer breathing machines is very high, and the maximum inlet pressure can reach nearly 90%. However, conventional proportional valves are not resistant to high pressures, cannot be sealed at high pressures, and cannot achieve proportional adjustment at high pressures.

Therefore, how to provide a micro proportional valve to achieve proportional adjustment of gas flow rate under high pressure is an urgent technical problem to be solved.

Disclosure of Invention

The invention aims to provide a micro proportional valve which can resist high pressure and realize proportional adjustment of gas flow under high pressure.

To this end, according to a first aspect, an embodiment of the present invention discloses a micro proportional valve, including: a housing; the sleeve is arranged at one end of the shell; the valve head is arranged at one end of the sleeve, which is far away from the shell, and is used for the circulation of gas; a seal assembly having a pilot bore for high pressure sealing of said valve head; the prepressing structure is arranged in the sleeve and is used for providing prepressing force for the sealing assembly; and the electromagnet assembly is arranged in the shell, is communicated with the pilot hole and is used for providing electromagnetic force for the sealing assembly so as to control the opening degree of a valve port of the proportional valve.

The invention is further provided that the sealing assembly comprises an upper diaphragm for sealing the valve head, a lower diaphragm is sleeved outside the upper diaphragm, and a lower gasket for fixing the lower diaphragm on the valve head is arranged in the valve head.

The invention is further arranged that a back pressure gasket is arranged in the valve head and is positioned on one side of the lower diaphragm, and the back pressure gasket is used for offsetting the high back pressure of the proportional valve.

The invention further provides that the lower gasket is in interference fit with the valve head.

The invention is further arranged in that the upper diaphragm comprises a rubber part and a framework, the rubber part is integrally formed on the outer side of one end of the framework, and the pilot hole is arranged in the framework.

The invention is further configured to further include: and the connecting wire penetrates through the shell and is connected with the electromagnet assembly.

The invention is further arranged such that the pre-compression structure comprises a spring plate mounted in the sleeve.

The invention is further arranged in that the electromagnet assembly comprises a magnetic conduction cylinder sleeved on the sleeve, a coil is wound on the outer side of the magnetic conduction cylinder, a stop iron and a moving iron are sequentially embedded in the magnetic conduction cylinder, the moving iron is abutted against the sealing assembly, and a through hole communicated with the pilot hole is formed in the moving iron.

The invention is further provided that a boss is arranged at one end of the stop iron, which is close to the moving iron, and the boss is used for reducing the influence of magnetic hysteresis on the micro proportional valve.

The invention is further provided that the opposite ends of the valve head are sequentially sleeved with a first sealing ring and a second sealing ring.

The invention has the following beneficial effects: the prepressing structure provides prepressing force for the sealing assembly, the sealing assembly plays a sealing role and is convenient to seal the valve head, high-pressure gas provides sealing auxiliary force for the sealing assembly through the pilot hole, and the sealing reliability of the micro proportional valve under high pressure is ensured; the electromagnet assembly provides electromagnetic force for the sealing assembly, the opening degree of a valve port of the proportional valve can be controlled, and then the miniature proportional valve is provided, so that the miniature proportional valve is high-pressure resistant and realizes proportional adjustment of gas flow under high pressure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic perspective view of a micro proportional valve disclosed in this embodiment;

FIG. 2 is an exploded view of a micro proportional valve according to the present disclosure;

fig. 3 is a schematic cross-sectional structure diagram of a micro proportional valve disclosed in this embodiment.

Reference numerals: 1. a housing; 2. a sleeve; 3. a valve head; 31. an air intake passage; 32. an air outlet channel; 33. a first groove; 34. a second groove; 4. a seal assembly; 41. an upper diaphragm; 411. a rubber member; 412. a framework; 413. a pilot hole; 42. a lower diaphragm; 43. a lower gasket; 44. a back pressure pad; 5. a pre-pressing structure; 51. a spring plate; 52. a central bore; 53. hollowing out holes; 6. an electromagnet assembly; 61. a magnetic conduction cylinder; 62. a coil; 63. blocking iron; 631. a boss; 64. moving iron; 641. a through hole; 65. cushion blocks; 7. a connecting wire; 8. a first seal ring; 9. and a second seal ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The embodiment of the invention discloses a micro proportional valve, as shown in figures 1-3, comprising: the device comprises a shell 1, a sleeve 2, a valve head 3, a sealing assembly 4, a pre-pressing structure 5 and an electromagnet assembly 6; the sleeve 2 is arranged at one end of the shell 1; the valve head 3 is arranged at one end of the sleeve 2 far away from the shell 1, and the valve head 3 is used for gas circulation; the sealing assembly 4 is provided with a pilot hole 413, and the sealing assembly 4 is used for carrying out high-pressure sealing on the valve head 3; the prepressing structure 5 is arranged in the sleeve 2, and the prepressing structure 5 is used for providing prepressing force for the sealing component 4; the electromagnet assembly 6 is arranged in the shell 1, the electromagnet assembly 6 is communicated with the pilot hole 413, and the electromagnet assembly 6 is used for providing electromagnetic force for the sealing assembly 4 so as to control the opening degree of the valve port of the proportional valve. In the specific implementation process, an air inlet channel 31 and an air outlet channel 32 are arranged in the valve head 3. The current can be adjusted within an adjustable width range under the condition of the same rated power and flow. The electromagnetic force is opposite to the direction of the pre-pressure and the sealing auxiliary force respectively.

It should be noted that, the pre-pressure structure 5 provides pre-pressure to the sealing assembly 4, the sealing assembly 4 plays a role in sealing, so as to facilitate sealing of the valve head 3, and the high-pressure gas provides sealing auxiliary force to the sealing assembly 4 through the pilot hole 413, so as to ensure the sealing reliability of the micro proportional valve under high pressure; the electromagnet assembly 6 provides electromagnetic force for the sealing assembly 4, the opening degree of a valve port of the proportional valve can be controlled, and therefore the miniature proportional valve is high-pressure resistant and achieves proportional adjustment of gas flow under high pressure.

As shown in fig. 2 and 3, the sealing assembly 4 includes an upper diaphragm 41 for sealing the valve head 3, a lower diaphragm 42 is sleeved on an outer side of the upper diaphragm 41, and a lower gasket 43 for fixing the lower diaphragm 42 to the valve head 3 is provided in the valve head 3.

As shown in fig. 2 and 3, a back pressure gasket 44 is provided in the valve head 3 on one side of the lower diaphragm 42, and the back pressure gasket 44 is used to counteract the high back pressure of the proportional valve. In the specific implementation process, a mounting step surface for mounting a back pressure gasket 44 is arranged in the valve head 3, and the back pressure is the back pressure of the outlet.

It should be noted that when the micro proportional valve is subjected to a high back pressure, the back pressure pad 44 of the lower diaphragm 42 is configured to have an area that offsets a substantial portion of the force generated by the back pressure, thereby reducing the effect of the back pressure on the linearity of the proportional valve.

As shown in fig. 2 and 3, the lower gasket 43 is interference fitted with the valve head 3.

As shown in fig. 2 and 3, the upper diaphragm 41 includes a rubber 411 and a frame 412, the rubber 411 is integrally formed outside one end of the frame 412, and a pilot hole 413 is provided in the frame 412. In a specific implementation, the upper membrane 41 is used to seal the inlet passage 31.

As shown in fig. 2 and 3, the method further includes: and the connecting wire 7 is connected with an external power supply, and the connecting wire 7 penetrates through the shell 1 and is connected with the electromagnet assembly 6.

As shown in fig. 2 and 3, the pre-pressing structure 5 includes an elastic sheet 51 installed in the sleeve 2. In the specific implementation process, the sleeve 2 is provided with tapered holes with inner diameters distributed in a step shape, and the tapered holes are convenient to provide a moving space for the elastic sheet 51.

It should be noted that, under normal pressure, the force generated by the air pressure is relatively small, and the force required by the elastic sheet 51 is also small, so that the electromagnetic force required by the micro proportional valve to open is also small, and the current required by the micro proportional valve to open is relatively smaller, thereby realizing wide current adjustment of the micro proportional valve.

As shown in fig. 2 and 3, the electromagnet assembly 6 includes a magnetic conduction cylinder 61 sleeved on the sleeve 2, a coil 62 is wound around the outer side of the magnetic conduction cylinder 61, a stop iron 63 and a moving iron 64 are sequentially embedded in the magnetic conduction cylinder 61, the moving iron 64 abuts against the sealing assembly 4, and a through hole 641 communicated with the pilot hole 413 is formed in the moving iron 64. In the specific implementation process, the middle of the elastic sheet 51 is provided with a central hole 52 for sleeving the moving iron 64, the moving iron 64 is provided with a butting surface abutted against the central hole 52, the elastic sheet 51 is further provided with a plurality of hollow holes 53 adjacent to the central hole 52, and the hollow holes 53 are of a central symmetrical structure. A spacer 65 located on the coil 62 side is fitted around the outside of the sleeve 2.

As shown in fig. 2 and 3, a boss 631 is disposed at an end of the stop iron 63 close to the moving iron 64, and the boss 631 is used to reduce the influence of hysteresis on the micro proportional valve. In particular implementations, the shape of the projection 631 can be circular, square, or other contours. Hysteresis: the change in magnetization or induction of the ferromagnetic substance always lags behind the phenomenon of the change in the magnetic field strength during magnetization and demagnetization.

It should be noted that when the current starts to decrease, the magnetic force attenuation cannot keep up with the current attenuation due to the action of hysteresis, and the boss 631 on the stop iron 63 ensures that a certain gap exists between the stop iron 63 and the moving iron 64, thereby reducing the influence of hysteresis on the control of the micro proportional valve; the electromagnetic force is enabled to quickly keep up with the attenuation of the current, and the flow controlled by the micro proportional valve is also enabled to be continuously reduced along with the continuous reduction of the current.

As shown in fig. 2 and 3, the opposite ends of the valve head 3 are sleeved with a first sealing ring 8 and a second sealing ring 9 in sequence. In the specific implementation process, the first sealing ring 8 and the second sealing ring 9 are both made of rubber materials; the outer side of the valve head 3 is provided with a first groove 33 and a second groove 34, the first groove 33 is used for being sleeved with the first sealing ring 8, and the second groove 34 is used for being sleeved with the second sealing ring 9.

The working principle is as follows: when the power is off, the micro proportional valve presses the upper diaphragm 41 against the sealing diaphragm of the valve head 3 under the action of the elastic sheet 51 to realize sealing, and along with the entering of high-pressure gas, the gas enters the cavity of the lower diaphragm 42 through the pilot hole 413 of the upper diaphragm 41 to provide downward sealing auxiliary force, so that the sealing reliability of the micro proportional valve under high pressure is ensured;

when the micro proportional valve is connected with an electric control signal, the electromagnetic coil 62 generates electromagnetic force, the electromagnetic force is transmitted through the shell 1, the cushion block 65, the moving iron 64 and the blocking iron 63, the magnetic conductive element is continuously charged with magnetism along with the continuous increase of current, the electromagnetic force is also continuously increased, the moving iron 64 moves towards the direction close to the blocking iron 63, when the electromagnetic force is greater than the air pressure acting force and the elastic force of the elastic sheet 51, the diaphragm 41 and the valve head 3 are opened, and the micro proportional valve starts to pass through flow; along with the continuous increase of the current, the opening degree of the micro proportional valve is also continuously increased, so that the flow is also continuously increased; when the current of the micro proportional valve is increased to the rated power of the micro proportional valve, the flow of the micro proportional valve reaches the maximum.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A micro proportional valve, comprising:

a housing (1);

a sleeve (2) disposed at one end of the housing (1);

the valve head (3) is arranged at one end, far away from the shell (1), of the sleeve (2) and is used for gas circulation;

a seal assembly (4) having a pilot bore (413) for high pressure sealing of the valve head (3);

the prepressing structure (5) is arranged in the sleeve (2) and is used for providing prepressing force for the sealing assembly (4);

and the electromagnet assembly (6) is arranged in the shell (1), is communicated with the pilot hole (413), and is used for providing electromagnetic force for the sealing assembly (4) so as to control the opening degree of a valve port of the proportional valve.

2. The micro proportional valve according to claim 1, wherein the sealing assembly (4) comprises an upper diaphragm (41) for sealing the valve head (3), a lower diaphragm (42) is sleeved on the outer side of the upper diaphragm (41), and a lower gasket (43) for fixing the lower diaphragm (42) to the valve head (3) is arranged in the valve head (3).

3. Micro proportional valve according to claim 2, characterized in that a back pressure gasket (44) is provided in the valve head (3) on the side of the lower membrane (42), the back pressure gasket (44) being used to counteract the high back pressure of the proportional valve.

4. The micro proportional valve according to claim 2, wherein the lower gasket (43) is an interference fit with the valve head (3).

5. The micro proportional valve according to claim 2, wherein the upper diaphragm (41) comprises a rubber member (411) and a frame (412), the rubber member (411) is integrally formed outside one end of the frame (412), and the pilot hole (413) is disposed in the frame (412).

6. The micro proportional valve of any of claims 1-5, further comprising: and the connecting wire (7) is connected with an external power supply, and the connecting wire (7) penetrates through the shell (1) and is connected with the electromagnet assembly (6).

7. Micro proportional valve according to any of claims 1-5, characterized in that the pre-compression structure (5) comprises a spring plate (51) mounted in the sleeve (2).

8. The micro proportional valve according to any one of claims 1 to 5, wherein the electromagnet assembly (6) comprises a magnetic conduction cylinder (61) sleeved on the sleeve (2), a coil (62) is wound on the outer side of the magnetic conduction cylinder (61), a stop iron (63) and a moving iron (64) are sequentially embedded in the magnetic conduction cylinder (61), the moving iron (64) abuts against the sealing assembly (4), and a through hole (641) communicated with the pilot hole (413) is formed in the moving iron (64).

9. The micro proportional valve of claim 8, wherein the stop iron (63) is provided with a boss (631) near one end of the moving iron (64), and the boss (631) is used for reducing the influence of hysteresis on the micro proportional valve.

10. The micro proportional valve according to any of claims 1-5, wherein a first sealing ring (8) and a second sealing ring (9) are sleeved on opposite ends of the valve head (3) in sequence.