Proportional valve and ventilator

Abstract

The present invention belongs to the technical field of proportional valves, and in particular relates to a proportional valve and a ventilator. The proportional valve includes a moving iron, a stationary iron, a coil, a shell and an elastic member. The stationary iron and the coil are arranged inside the shell, and the coil is sleeved on the outside of the stationary iron. The shell has a valve cavity and an air source inlet, a working outlet and an air outlet all connected to the valve cavity. The moving iron is arranged in the valve cavity and is located between the air source inlet and the air outlet. The elastic member is connected to the moving iron and is used to provide pre-pressure so that the moving iron has a tendency to move toward the air source inlet. When the coil is energized, the stationary iron attracts the moving iron to move toward the air outlet. The moving iron can be driven to move in the valve cavity through the elastic member and the stationary iron to adjust the opening of the air source inlet and the opening of the air outlet. In this embodiment, the coil is slowly energized so that the pressure at the working outlet is different when the moving iron is at different positions in the valve cavity. Therefore, by adjusting the position of the moving iron between the air source inlet and the air outlet, the effect of controlling the pressure at the working outlet is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of proportional valves, and in particular relates to a proportional valve and a ventilator. Background Art

[0002] A conventional proportional valve is a flow control valve that achieves the desired flow rate by varying the current and adjusting the valve core opening. Proportional valves require control of many factors, with the ultimate goal being the relationship between current and flow. Flow is related to valve core opening, which is in turn related to electromagnetic force and elastic force, which in turn is related to current and the clearance between the moving and static irons. Effective flow control requires coordination of these parameters, thus regulating the flow at the proportional valve outlet by controlling the current.

[0003] In fluid pipelines, current proportional valves can generally control the flow rate of the fluid, but cannot achieve pressure control. Therefore, it is necessary to design a proportional valve that can adjust the pressure. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a proportional valve and a ventilator in view of the problem that the existing proportional valve cannot realize pressure control.

[0005] To solve the above technical problems, on the one hand, an embodiment of the present invention provides a proportional valve, comprising a moving iron, a stationary iron, a coil, a housing, and an elastic member, wherein the stationary iron and the coil are arranged inside the housing, and the coil is sleeved outside the stationary iron;

[0006] The housing has a valve cavity, an air source inlet, a working outlet, and an air outlet, wherein the air source inlet, the working outlet, and the air outlet are all connected to the valve cavity, and the moving iron is arranged in the valve cavity and located between the air source inlet and the air outlet;

[0007] The elastic member is connected to the moving iron and is used to provide pre-pressure so that the moving iron has a tendency to move toward the air source inlet; the static iron attracts the moving iron to move toward the air outlet when the coil is energized, and the moving iron can be driven to move in the valve cavity through the elastic member and the static iron to adjust the opening of the air source inlet and the opening of the air outlet.

[0008] Optionally, the moving iron includes a main body and a positioning shaft, the positioning shaft is arranged on the main body and extends axially along the shell, and the thickness of the main body close to the positioning shaft is greater than the thickness of the main body away from the positioning shaft.

[0009] Optionally, the positioning shaft includes a first positioning shaft and a second positioning shaft, the first positioning shaft extends from the main body toward the air source inlet, the second positioning shaft extends from the main body toward the air outlet, and the elastic member is fixed between the first positioning shaft and the inner wall surface of the valve cavity.

[0010] Optionally, the proportional valve further comprises a guide member, wherein the guide member is sleeved on the second positioning shaft, and a clearance fit is formed between an outer edge of the guide member and an inner wall surface of the valve cavity.

[0011] Optionally, the moving iron also includes a first sealing member, the moving iron having a through hole extending axially along the outer shell, the first sealing member is embedded in the through hole and the positioning shaft is protruded at both ends, a side surface of the first sealing member close to the air source inlet is used to close the air source inlet, and a side surface of the first sealing member close to the air outlet is used to close the air outlet.

[0012] Optionally, the outer shell includes a shell and a valve seat, the static iron is connected to the shell, the valve seat is arranged at an end of the shell away from the static iron, the valve cavity is located between the valve seat and the static iron, and the air source inlet is arranged on the valve seat.

[0013] Optionally, an air inlet channel is provided on the valve seat, and the air source inlet is connected to the valve cavity through the air inlet channel;

[0014] The static iron is provided with a first air outlet channel, the shell is provided with a second air outlet channel, and the air outlet is connected to the valve cavity through the second air outlet channel and the first air outlet channel.

[0015] Optionally, the proportional valve further includes a second sealing member, which is disposed between an outer wall surface of the static iron and an inner wall surface of the housing, and the second sealing member abuts against the coil.

[0016] Optionally, the proportional valve further comprises a baffle, wherein the baffle abuts against the second sealing member.

[0017] On the other hand, an embodiment of the present invention provides a ventilator, comprising a breathing circuit, a safety one-way member and the proportional valve of the above embodiment, wherein the safety one-way member separates the breathing circuit and the working outlet of the proportional valve, and the safety one-way member is used to open when the pressure in the breathing circuit is greater than the pressure at the working outlet to relieve the pressure in the breathing circuit.

[0018] The proportional valve provided by an embodiment of the present invention, when not powered, the movable iron blocks the gas source inlet under the pre-pressure of the elastic member, preventing the gas source from entering, and the pressure at the working outlet is equal to the pressure at the air outlet, which is equal to atmospheric pressure, at which point the pressure is minimum. When the coil is slowly energized, the movable iron gradually moves toward the stationary iron, and the stroke of the movable iron is designed to be within the effective openings of the gas source inlet and the air outlet, so that the opening of the gas source inlet slowly increases, while the opening of the air outlet correspondingly decreases, reducing the gas flowing out of the air outlet, so that the pressure in the valve cavity gradually increases until the pressure reaches a maximum when the movable iron blocks the air outlet.

[0019] In this embodiment, the opening of the air source inlet and the air outlet is controlled by moving the moving iron between the air source inlet and the air outlet. When the moving iron is at different positions in the valve cavity, the pressure at the working outlet is different. Therefore, by adjusting the position of the moving iron between the air source inlet and the air outlet, the effect of controlling the pressure at the working outlet is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a proportional valve provided in one embodiment of the present invention;

[0021] Figure 2 is an exploded view of a proportional valve provided in one embodiment of the present invention;

[0022] Figure 3 It is a cross-sectional schematic diagram of a proportional valve provided by one embodiment of the present invention.

[0023] The reference numerals in the specification are as follows:

[0024] 1. Moving iron; 11. Main body; 12. First positioning shaft; 13. Second positioning shaft; 14. First sealing member;

[0025] 2. Stationary iron; 21. First air outlet channel;

[0026] 3. Coil;

[0027] 4. Outer shell; 41. Shell; 411. Valve chamber; 412. Working outlet; 413. Air outlet; 414. Second air outlet; 42. Valve seat; 421. Air source inlet; 422. Air inlet;

[0028] 5. Elastic parts;

[0029] 6. Guide parts;

[0030] 7. Second sealing member;

[0031] 8. Baffle. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the description of the present invention, it should be understood that the terms "front", "rear", "vertical", "horizontal", "up", "down", "inside", "outside" and other directional words are only based on the drawings used in the present invention and are not specific limitations of the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] like Figures 1 to 3 As shown, on the one hand, an embodiment of the present invention provides a proportional valve, including a moving iron 1, a stationary iron 2, a coil 3, a housing 4 and an elastic member 5. The stationary iron 2 and the coil 3 are arranged inside the housing 4, and the stationary iron 2 is connected to the housing 4 and is fixed. The coil 3 is sleeved on the outside of the stationary iron 2. When the coil 3 is energized, the stationary iron 2 is magnetized to generate electromagnetic attraction. Under the action of the electromagnetic attraction, the moving iron 1 can be attracted to the stationary iron 2, and the stationary iron 2 and the moving iron 1 gradually approach each other.

[0036] The housing 4 has a valve cavity 411, an air source inlet 421, a working outlet 412, and an air outlet 413. The air source inlet 421, the working outlet 412, and the air outlet 413 are all in communication with the valve cavity 411. The movable iron 1 is disposed in the valve cavity 411 and located between the air source inlet 421 and the air outlet 413. The elastic member 5 is connected to the movable iron 1 and can provide preload, causing the movable iron 1 to tend to move toward the air source inlet 421. When power is off, the electromagnetic attraction of the stationary iron 2 disappears, and the elastic member 5 can drive the movable iron 1 to reset.

[0037] When the coil 3 is energized, the static iron 2 attracts the moving iron 1 to move toward the air outlet 413, thereby enabling the gas source inlet 421 to communicate with the air outlet 413 through the valve cavity 411. The moving iron 1 can be driven to move back and forth within the valve cavity 411 by the elastic member 5 and the static iron 2. The pre-pressure of the elastic member 5 is opposite to the direction of the electromagnetic attraction of the static iron 2, so as to adjust the opening of the gas source inlet 421 and the opening of the air outlet 413, change the effective opening area between the moving iron 1 and the gas source inlet 421, and the effective opening area between the moving iron 1 and the air outlet 413, and thereby adjust the pressure of the gas in the valve cavity 411 on the working outlet 412.

[0038] Specifically, when no power is supplied, the moving iron 1 is pushed to the air source inlet 421 under the pre-pressure of the elastic member 5, and the air source inlet 421 is blocked, so that the air source cannot enter. At this time, there is no fluid flow at the working outlet 412 and the air outlet 413. The working outlet 412 is connected to the air outlet 413 through the valve cavity 411. The pressure at the working outlet 412 is equal to the pressure at the air outlet 413. The air outlet 413 is connected to the outside world, that is, the pressure at the working outlet 412 is equal to the atmospheric pressure. At this time, the pressure at the working outlet 412 is the minimum pressure.

[0039] When the coil 3 is slowly energized, the static iron 2 generates electromagnetic attraction, and the moving iron 1 gradually moves toward the static iron 2. The stroke of the moving iron 1 is designed to be within the effective opening of the gas source inlet 421 and the air outlet 413. While the moving iron 1 moves away from the gas source inlet 421, it gradually approaches the air outlet 413, so that the opening of the gas source inlet 421 slowly increases, while the opening of the air outlet 413 correspondingly decreases until the moving iron 1 blocks the air outlet 413. During this process, the gas source inlet 421 can be connected to the air outlet 413 through the valve chamber 411, and the gas introduced from the gas source inlet 421 can flow out from the air outlet 413. As the opening of the gas source inlet 421 increases, it is easier for gas to enter the valve cavity 411, and as the opening of the air outlet 413 decreases, the resistance of the gas in the valve cavity 411 to enter the air outlet 413 will increase, and the gas flowing out of the air outlet 413 will be reduced, so that the pressure in the valve cavity 411 gradually increases until the moving iron 1 blocks the air outlet 413, and the pressure in the valve cavity 411 reaches the maximum, that is, the pressure of the working outlet 412 reaches the maximum.

[0040] It is understandable that when the coil 3 is powered off, the electromagnetic attraction of the static iron 2 disappears, the elastic member 5 can drive the moving iron 1 to reset, and the moving iron 1 moves away from the static iron 2 until the moving iron 1 re-blocks the air source inlet 421.

[0041] Therefore, with atmospheric pressure as the zero point, in the process of the moving iron 1 moving from the air source inlet 421 to the air outlet 413, the pressure at the working outlet 412 starts to increase from 0. When the air outlet 413 is blocked, the pressure reaches the maximum. At this time, the pressure at the working outlet 412 is equal to the pressure of the air source inlet 421.

[0042] That is, in this embodiment, the opening of the air source inlet 421 and the air outlet 413 is controlled by moving the moving iron 1 between the air source inlet 421 and the air outlet 413. When the moving iron 1 is at different positions in the valve cavity 411, the pressure at the working outlet 412 is different. Therefore, by adjusting the position of the moving iron 1 between the air source inlet 421 and the air outlet 413, the opening of the air source inlet 421 and the air outlet 413 can be adjusted, and different pressures are formed in the valve cavity 411, thereby achieving the effect of controlling the pressure at the working outlet 412.

[0043] In addition, during the movement of the moving iron 1, the flow rate of the proportional valve will increase first and then decrease. When the moving iron 1 blocks the gas source inlet 421 or the air outlet 413, the gas cannot flow out, and the flow rate of the proportional valve is 0. When the moving iron 1 moves to the position between the gas source inlet 421 and the air outlet 413, the effective opening area of ​​the moving iron 1 and the gas source inlet 421 is equal to the effective opening area of ​​the moving iron 1 and the air outlet 413, and the flow rate reaches the maximum. When the moving iron 1 moves from the position of blocking the gas source inlet 421 to the middle position of the valve cavity 411, the flow rate gradually increases from 0 to the maximum. When the moving iron 1 continues to move toward the air outlet 413, the flow rate gradually decreases until the flow rate is reduced to 0 when the moving iron 1 blocks the air outlet 413.

[0044] In one specific embodiment, a proportional valve is used in a ventilator to control the pressure of the ventilator's safety relief. Specifically, the working outlet 412 of the proportional valve is connected to the ventilator's breathing circuit. A safety diaphragm is disposed between the working outlet 412 and the breathing circuit. The pressure at the working outlet 412 exerts pressure on the safety diaphragm, preventing gas in the breathing circuit from escaping. When the pressure in the breathing circuit increases and exceeds the pressure at the working outlet 412, the gas in the breathing circuit pushes open the safety diaphragm, allowing the gas in the breathing circuit to escaping, thereby reducing the pressure in the breathing circuit and achieving pressure relief.

[0045] A channel is provided between the working outlet 412 and the safety diaphragm, and the channel is filled with air. When the moving iron 1 starts to move due to the attraction of the static iron 2, the air source inlet 421 fills the valve cavity 411 with gas. Since the above-mentioned channel is filled with air, the gas filled in the valve cavity 411 will directly flow out from the air outlet 413 without entering the above-mentioned channel, so that the gas will not leak out and will only flow along the path of the air source inlet 421 and the air outlet 413. By adjusting the position of the moving iron in the valve cavity 411, different pressures will be created in the valve cavity 411 when gas is filled into the valve cavity 411 from the air source inlet 421, thereby changing the pressure at the safety diaphragm and achieving the effect of adjusting the safety pressure of the ventilator.

[0046] In a preferred embodiment, if Figure 3 As shown, the gas source inlet 421 and the air outlet 413 are arranged at the axial ends of the shell 4, and the working outlet 412 is arranged on the part of the shell 4 at the valve cavity 411. The aperture of the gas source inlet 421 and the aperture of the air outlet 413 are designed to be smaller, and the aperture of the working outlet 412 is designed to be larger.

[0047] In one embodiment, if Figure 2 、 Figure 3 As shown, the moving iron 1 includes a main body 11 and a positioning shaft, the positioning shaft is arranged on the main body 11 and extends along the axial direction of the shell 4, the thickness of the main body 11 close to the positioning shaft is greater than the thickness of the main body 11 away from the positioning shaft, wherein there is a gap between the outer edge of the main body 11 and the inner wall surface of the shell 4, the gas introduced by the gas source inlet 421 can flow into the above-mentioned gap through the guidance of the main body 11, so that the gas fills the valve cavity 411, and the gas in the valve cavity 411 flows out through the air outlet 413 below the moving iron 1.

[0048] In one embodiment, if Figure 3 As shown, the positioning shaft includes a first positioning shaft 12 and a second positioning shaft 13, and the first positioning shaft 12 and the second positioning shaft 13 are arranged at the axial ends of the main body 11. The first positioning shaft 12 extends from the main body 11 toward the air source inlet 421, and the second positioning shaft 13 extends from the main body 11 toward the air outlet 413. The elastic member 5 is fixed between the first positioning shaft 12 and the inner wall surface of the valve cavity 411.

[0049] The elastic member 5 is sleeved on the first positioning shaft 12 and relatively fixed to the first positioning shaft 12. The outer edge of the elastic member 5 is clamped on the inner wall of the outer shell 4. The elastic member 5 will not move in the axial direction, but will only undergo elastic deformation, thereby generating a deformation elastic force. The deformation elastic force is balanced with the electromagnetic attraction of the static iron 2, and can control the opening position of the moving iron 1, thereby adjusting the pressure of the working outlet 412. The magnitude of the electromagnetic attraction of the static iron 2 can be controlled by the current of the coil 3.

[0050] In one embodiment, if Figure 3 As shown, the proportional valve also includes a guide member 6, which is sleeved on the second positioning shaft 13, and there is a clearance fit between the outer edge of the guide member 6 and the inner wall surface of the valve cavity 411. The guide member 6 has a hole, and the second positioning shaft 13 is inserted into the above-mentioned hole, so that the guide member 6 can move axially relative to the movable iron 1. The outer edge of the guide member 6 and the inner wall surface of the valve cavity 411 have a clearance fit, so that the guide member 6 can move axially relative to the housing 4, thereby ensuring that the movable iron 1 moves along the central axis of the housing 4 when moving, and preventing the movable iron 1 from touching the housing 4 after tilting and affecting its movement.

[0051] Among them, during the movement of the moving iron 1, when the moving iron 1 and the guide member 6 are stuck, the moving iron 1 can still achieve axial movement through the relative sliding between the guide member 6 and the housing 4. Similarly, when the housing 4 and the guide member 6 are stuck, the moving iron 1 can still achieve axial movement through the sliding of the guide member 6 and the second positioning shaft 13. When the guide member 6 and the housing 4 and the second positioning shaft 13 are all stuck, the guide member 6 can deform to provide the necessary movement stroke, and the force generated by the deformation of the guide member 6 is far less than the pre-pressure of the elastic member 5, which has little effect on the force applied to the moving iron 1, and can still ensure the smoothness of the entire movement process of the moving iron 1.

[0052] Preferably, the elastic member 5 and the guide member 6 are both springs, the guide member 6 is arranged above the movable iron 1, and the elastic member 5 is arranged below the movable iron 1. The elastic member 5 and the guide member 6 cover the movable iron 1 from top to bottom, ensuring that the movable iron 1 can only move axially, while ensuring smooth and reliable axial movement of the movable iron 1.

[0053] In one embodiment, if Figure 3As shown, the moving iron 1 also includes a first sealing member 14, and the moving iron 1 has a through hole extending axially along the outer shell 4, and the through hole axially passes through the first positioning shaft 12, the main body 11 and the second positioning shaft 13, and the first sealing member 14 is embedded in the through hole and protrudes from the positioning shaft at both ends, and the end of the first sealing member 14 close to the air outlet 413 protrudes from the first positioning shaft 12, and the side surface of the first sealing member 14 close to the air outlet 413 is used to close the air outlet 413, and the end of the first sealing member 14 close to the air source inlet 421 protrudes from the second positioning shaft 13, and the side surface of the first sealing member 14 close to the air source inlet 421 is used to close the air source inlet 421.

[0054] When the coil 3 is not energized, the elastic member 5 acts to seal the air source inlet 421 on the side of the first sealing member 14 adjacent to the air source inlet 421. At this point, air cannot enter, and the pressure at the working outlet 412 is equal to atmospheric pressure, representing the minimum air pressure. When the coil 3 is energized, the stationary iron 2 attracts the movable iron 1, causing the movable iron 1 to move within the valve cavity 411. When the side of the first sealing member 14 adjacent to the air outlet 413 seals the air outlet 413, the pressure at the working outlet 412 equals the pressure at the air source inlet 421, representing the maximum air pressure.

[0055] Preferably, the first sealing member 14 is made of rubber, has a certain deformation ability, and has a good sealing effect.

[0056] In one embodiment, if Figure 2 、 Figure 3 As shown, the housing 4 includes a shell 41 and a valve seat 42. The shell 41 is a cylindrical structure with one end open. The static iron 2 is connected to the shell 41, and the static iron 2 is connected to the end of the shell 41 away from the opening. The coil 3 is arranged between the outer circumference of the static iron 2 and the inner circumference of the shell 41. The valve seat 42 is arranged at the end of the shell 41 away from the static iron 2, that is, the valve seat 42 is arranged at the opening of the shell 41. The valve cavity 411 is located between the valve seat 42 and the static iron 2. The moving iron 1 can move between the valve seat 42 and the static iron 2. The air source inlet 421 is arranged on the valve seat 42, and the working outlet 412 is arranged on the part of the shell 41 at the valve cavity 411.

[0057] Among them, when the moving iron 1 abuts against the valve seat 42, the first sealing member 14 can prevent the gas source from entering the valve cavity 411 from the gas source inlet 421, and when the moving iron 1 abuts against the static iron 2, the first sealing member 14 can prevent the gas in the valve cavity 411 from flowing out from the air outlet 413.

[0058] In one embodiment, if Figure 3 As shown, the valve seat 42 is provided with an air inlet channel 422, and the air source inlet 421 is connected to the valve cavity 411 through the air inlet channel 422. When the movable iron 1 abuts against the stationary iron 2, the pressure at the working outlet 412 is equal to the pressure at the air source inlet 421. Preferably, the air inlet channel 422 penetrates the valve seat 42 along the axial direction of the housing 41, and the air source inlet 421 can be connected to the valve cavity 411 through the air inlet channel 422, thereby ventilating the valve cavity 411.

[0059] The stationary iron 2 is provided with a first air outlet channel 21, and the housing 41 is provided with a second air outlet channel 414. The second air outlet channel 414 is connected to the first air outlet channel 21. The air outlet 413 is connected to the valve cavity 411 through the second air outlet channel 414 and the first air outlet channel 21. When the moving iron 1 abuts the valve seat 42, the pressure at the working outlet 412 is equal to the pressure at the air outlet 413. The air outlet 413 is connected to the outside world and is equal to atmospheric pressure.

[0060] Among them, the first air outlet channel 21 penetrates the static iron 2 along the axial direction of the shell 41, and the second air outlet channel 414 penetrates the shell 41 along the radial direction of the shell 41 from the end of the first air outlet channel 21 away from the valve cavity 411. The air source inlet 421 passes the gas into the valve cavity 411, and the space between the working outlet 412 and the safety diaphragm is filled with air. The gas in the valve cavity 411 will pass through the first air outlet channel 21 and the second air outlet channel 414 in turn and then be discharged from the air outlet 413.

[0061] In one embodiment, if Figure 3 As shown, the proportional valve also includes a second sealing member 7, which is arranged between the outer wall surface of the static iron 2 and the inner wall surface of the outer shell 4. The second sealing member 7 is annular and is sleeved on the outside of the static iron 2. The outer edge of the second sealing member 7 abuts against the inner wall surface of the outer shell 4. The second sealing member 7 abuts against the coil 3 to prevent the gas in the valve cavity 411 from entering the coil 3, thereby playing a sealing role.

[0062] Preferably, the second sealing member 7 is made of rubber, has a certain deformation ability, and has a good sealing effect.

[0063] In one embodiment, if Figure 3 As shown, the proportional valve further includes a baffle 8, which abuts the second seal 7. The second seal 7 is axially located between the baffle 8 and the coil 3. The baffle 8 can press the second seal 7, improving the stability of the second seal 7. At the same time, it can also cause the second seal 7 to deform to a certain extent, thereby better abutting the static iron 2 and the housing 4 to prevent air leakage. The baffle 8 is sleeved on the outside of the static iron 2 and has an annular shape.

[0064] On the other hand, an embodiment of the present invention provides a ventilator, comprising a breathing circuit, a safety one-way member and the proportional valve of the above embodiment, wherein the safety one-way member separates the breathing circuit and the working outlet 412 of the proportional valve, and the safety one-way member is used to open when the pressure in the breathing circuit is greater than the pressure of the working outlet 412 to relieve the pressure in the breathing circuit.

[0065] When the gas pressure in the breathing tube is lower than the pressure at the working outlet 412, the safety one-way member cannot be opened, and the gas in the breathing tube cannot be discharged. When the gas pressure in the breathing tube is higher than the pressure at the working outlet 412, the gas in the breathing tube can push open the safety one-way member, allowing the gas in the breathing tube to be discharged, reducing the pressure in the breathing tube and achieving pressure relief.

[0066] Conventionally, the safety one-way member includes a one-way valve body and a safety diaphragm. The working outlet 412 can be connected to the safety one-way member directly or via a pipe. The one-way valve body can be directly mounted on the working outlet 412 or mounted on a pipe outside the working outlet 412. The safety diaphragm is mounted on the one-way valve body, which is provided with an air hole.

[0067] When the pressure of the gas in the breathing circuit is lower than the pressure at the working outlet 412, the air in the pipe presses against the safety diaphragm, which blocks the air holes in the one-way valve body, preventing the gas from flowing out. When the pressure of the gas in the breathing circuit is higher than the pressure at the working outlet 412, the gas in the breathing circuit can push open the air holes in the one-way valve body, and the gas in the breathing circuit is discharged from the air holes in the one-way valve body, thereby achieving control of the breathing circuit pressure relief pressure through the proportional valve.

[0068] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. However, such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention and are intended to be included within the scope of protection of the present invention.

Claims

1. A proportional valve, characterized in that: The invention comprises a moving iron, a stationary iron, a coil, a shell and an elastic member, wherein the stationary iron and the coil are arranged inside the shell, and the coil is sleeved outside the stationary iron; The housing has a valve cavity, an air source inlet, a working outlet, and an air outlet, wherein the air source inlet, the working outlet, and the air outlet are all connected to the valve cavity, and the moving iron is arranged in the valve cavity and located between the air source inlet and the air outlet; The elastic member is connected to the movable iron and is used to provide pre-pressure so that the movable iron has a tendency to move toward the air source inlet; The stationary iron attracts the movable iron to move toward the air outlet when the coil is energized, and the movable iron can be driven to move in the valve cavity through the elastic member and the stationary iron to adjust the opening of the air source inlet and the opening of the air outlet; The movable iron comprises a main body and a positioning shaft, wherein the positioning shaft is provided on the main body and extends along the axial direction of the housing, and the thickness of the main body at one end close to the positioning shaft is greater than the thickness of the main body at one end away from the positioning shaft; The positioning shaft includes a first positioning shaft and a second positioning shaft, the first positioning shaft extends from the main body toward the gas source inlet, the second positioning shaft extends from the main body toward the air outlet, and the elastic member is fixed between the first positioning shaft and the inner wall surface of the valve cavity; The movable iron further includes a first sealing member, the movable iron having a through hole extending axially along the housing, the first sealing member being embedded in the through hole and having both ends protruding from the positioning shaft, a side surface of the first sealing member close to the air source inlet being used to seal the air source inlet, and a side surface of the first sealing member close to the air outlet being used to seal the air outlet; When the moving iron is at different positions in the valve cavity, the pressure at the working outlet is different.

2. The proportional valve according to claim 1, characterized in that The proportional valve further includes a guide member, which is sleeved on the second positioning shaft, and a clearance fit is formed between an outer edge of the guide member and an inner wall surface of the valve cavity.

3. The proportional valve according to claim 1, wherein: The shell includes a shell and a valve seat, the static iron is connected to the shell, the valve seat is arranged at one end of the shell away from the static iron, the valve cavity is located between the valve seat and the static iron, and the air source inlet is arranged on the valve seat.

4. The proportional valve according to claim 3, characterized in that An air inlet channel is provided on the valve seat, and the air source inlet is connected to the valve cavity through the air inlet channel; The static iron is provided with a first air outlet channel, the shell is provided with a second air outlet channel, and the air outlet is connected to the valve cavity through the second air outlet channel and the first air outlet channel.

5. The proportional valve according to claim 1, wherein: The proportional valve further includes a second sealing member disposed between an outer wall surface of the static iron and an inner wall surface of the housing, and the second sealing member abuts against the coil.

6. The proportional valve according to claim 5, characterized in that The proportional valve further includes a stopper abutting the second sealing member.

7. A ventilator, characterized in that: It comprises a breathing circuit, a safety one-way piece and the proportional valve according to any one of claims 1 to 6, wherein the safety one-way piece separates the breathing circuit and the working outlet of the proportional valve, and the safety one-way piece is used to open when the pressure in the breathing circuit is greater than the pressure at the working outlet to relieve the pressure in the breathing circuit.

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