WO2020024924A1 - Electromagnetic driving device and gas proportional valve having same - Google Patents

Abstract

An electromagnetic driving device, provided with a cavity (48). The electromagnetic driving device comprises a housing (40) and a magnetic conduction core (44); the housing (40) at least comprises a magnetic conduction part; the magnetic conduction part comprises a top wall part (401) and a side wall part (402); the top wall part (401) is fixedly connected to the magnetic conduction core (44); a movable coil assembly (43) is provided at the periphery of the magnetic conduction core (44); the movable coil assembly (43) can reciprocate along the axis direction of the magnetic conduction core (44); the electromagnetic driving device further comprises a permanent magnet (41); the permanent magnet (41) is accommodated in the cavity and is located at the peripheral part of the movable coil assembly (43); a first spacing (L1) is formed between the top wall part (401) and the permanent magnet (41), a second spacing (L2) is formed between the permanent magnet (41) and the side wall of the magnetic conduction core (44), the first spacing (L1) is greater than the second spacing (L2), and magnetic force is more concentrated at the second spacing (L2); in case of performing actuation, the movable coil assembly (43) can induce sufficient magnetic thrust force so as to perform more reliable actuation. The electromagnetic driving device can improve magnetic performance, and thus the actuation reliability of the electromagnetic driving device and a gas proportional valve having same is relatively improved.

Description

Electromagnetic driving device and gas proportional valve having the same

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on July 31, 2018 with the application number 201810855832.X and the invention name "Electromagnetic Drive and Gas Proportional Valve with the Magnetic Drive" The contents are incorporated herein by reference.

Technical field

The invention relates to the technical field of electromagnetic drive control and gas control, in particular to an electromagnetic drive device and a gas proportional valve having the electromagnetic drive device.

Background technique

The electromagnetic driving device includes a permanent magnet, a magnet core, and a coil component. The magnetic field generated by the coil component being energized interacts with the magnetic field generated by the permanent magnet, so that the coil component drives the valve plug near or away from the valve port. When the magnetic force obtained by the coil component The larger the value, the more accurate it is to accurately actuate the valve plug. The magnetic force of the electromagnetic drive device is weak. Therefore, the movable coil component cannot obtain sufficient magnetic thrust for normal operation, which affects the operation of the electromagnetic drive device. reliability.

Summary of the invention

The main object of the present invention is to provide an electromagnetic driving device and a gas proportional valve having the electromagnetic driving device. The use of the electromagnetic driving device can improve the magnetic efficiency and relatively improve the operation reliability of the gas proportional valve.

The invention provides an electromagnetic driving device provided with a cavity. The electromagnetic driving device includes a housing and a magnetic core. The housing includes at least a magnetic conductive portion. The magnetic conductive portion includes a top wall portion and a side wall portion. The top wall portion and the magnetic core are provided. Fixed connection. The outer periphery of the magnet core is provided with a moving coil component. The moving coil component can reciprocate along the axis direction of the magnet core. The electromagnetic driving device further includes a permanent magnet. A first gap is formed between the top wall portion of the outer peripheral portion and the permanent magnet, and a second gap is formed between the permanent magnet and the side wall of the magnet core, and the first gap is greater than the second gap.

The present invention also provides an electromagnetic driving device provided with a cavity. The electromagnetic driving device includes a housing and a magnetic conductor core. The housing includes at least a magnetic conductive portion. The magnetic conductive portion includes a top wall portion and a side wall portion. The core is fixedly connected, and a moving coil component is provided on the outer periphery of the magnetic guide core. The moving coil component can reciprocate along the axial direction of the magnetic guide core. The electromagnetic driving device further includes a permanent magnet, which is housed in the cavity. The permanent magnet is provided with a convex The platform portion, the boss portion protrudes toward the magnet core, a first gap is formed between the top wall portion and the permanent magnet, and a third gap is formed between the boss portion and the side wall of the magnet core, the first gap is greater than Third pitch.

The invention also provides a gas proportional valve, which includes a main valve seat. The main valve seat is provided with an inlet and an outlet. The main valve seat is fixedly connected with an electromagnetic drive component, a servo drive component and an electromagnetic drive device. There are pressure difference adjustment devices, electromagnetic drive components and servo drive components leading the safety switching function of the gas proportional valve, and electromagnetic drive devices and pressure difference adjustment devices dominate the gas flow adjustment function.

The electromagnetic driving device provided by the present invention includes a casing and a magnetic core. The casing at least includes a magnetic conductive portion. The magnetic conductive portion includes a top wall portion and a side wall portion. The top wall portion is fixedly connected to the magnetic core. There is a moving coil component, and the moving coil component can reciprocate along the axis direction of the magnetizing core. The electromagnetic driving device further includes a permanent magnet, the permanent magnet is housed in the cavity, and the permanent magnet is located at the outer periphery of the moving coil component. A first gap is formed between the top wall portion and the permanent magnet, and a second gap is formed between the permanent magnet and the side wall of the magnet core. The first gap is greater than the second gap. The housing can provide a magnetic force transmission effect and the first gap is greater than At the second distance, the magnetic force is relatively concentrated in the first distance. When the electromagnetic drive device is energized, the moving coil assembly can obtain sufficient magnetic thrust to reciprocate along the axis direction of the magnet core, which improves the magnetic efficiency and can relatively increase the electromagnetic drive device. Operation reliability.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the embodiments of the present invention more clearly, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can obtain other drawings according to the drawings without paying creative labor.

FIG. 1 is a sectional view of an electromagnetic driving device according to a first embodiment of the present invention.

2 is a cross-sectional view of a gas proportional valve provided with the electromagnetic driving device of FIG. 1 provided by the present invention;

FIG. 3 is a schematic sectional view of an electromagnetic driving device according to a second embodiment of the present invention.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1, a first embodiment of an electromagnetic driving device according to the present invention is provided. The electromagnetic driving device 4 includes a housing 40 and a magnetic core 44. The housing 40 includes at least a magnetic conductive portion, and the magnetic conductive portion includes a top wall portion 401 and The side wall portion 402, the top wall portion 401 and the magnet core 44 are fixedly connected. A moving coil component 43 is provided on the outer peripheral portion of the magnet core 44. The movable coil component 43 can move axially along the magnet core 44. The electromagnetic driving device The cavity 4 is provided. The electromagnetic driving device 4 further includes a permanent magnet 41. The permanent magnet 41 is located in the cavity 48. The permanent magnet 41 is located on the outer peripheral portion of the moving coil component 43. The moving coil component 43 can be along the axis direction of the magnet core 44. During reciprocating motion, a first distance L1 is formed between the top wall portion 401 and the permanent magnet 41, and a second distance L2 is formed between the permanent magnet 41 and the side wall of the magnet core 44. The first distance L1 is greater than the second distance L2, the outer shell 40 covers the permanent magnet 41. The permanent magnet 41 has a substantially hollow ring structure. The outer shell 40 further includes an extension 403 extending outward from the side wall portion 402. The electromagnetic drive device 4 further includes a cover plate 47. The casing 40 is fixedly connected to the cover plate 47. The cover plate 47 includes a flat plate. The part 471 and the protruding part 472, the parallel part 471 and the extension part 403 are matched and the two can be provided with corresponding screw holes. The housing 40 and the cover plate 47 can be fixedly connected by means of screws or welding, etc. The core 44 and the cover plate 47 are fixedly connected to form the cavity 48 of the electromagnetic driving device 4. It should be noted that the magnetically permeable part here refers to the magnetically permeable component. The whole 40 can be stamped and formed from a magnetically permeable metal sheet. The housing 40 can also be made of low carbon steel or other magnetically permeable materials, or the magnetically permeable portion can be injection molded into the housing 40 as an insert with plastic parts or other materials. It is only necessary to ensure that the outer casing 40 has magnetic permeability. The outer casing 40 has a substantially cylindrical structure. The magnetic core 44 is made of pure iron or low-carbon steel magnetic material. The top wall 401 of the outer casing 40 and the magnetic conductor are turned. The core 44 can be fixedly connected by welding or riveting. The electromagnetic driving device 4 includes a moving coil assembly 43 including a field coil group 431 and a wire frame 432. The field coil group 431 is fixedly installed on the wire frame 432, and the permanent magnet 41 is located in the cavity 48. The permanent magnet 41 is generally a hollow ring structure, and is provided with an inner ring surface and an outer ring surface. The permanent magnet 41 includes an outer diameter magnetic pole portion 411 and an inner diameter magnetic pole portion 412. The outer diameter magnetic pole portion 411 is relatively close to the outside. Toroidal, the inner diameter magnetic pole portion 412 is relatively close to the inner toroidal surface, the outer diameter magnetic pole portion 411 is abutted against the side wall portion 402 of the housing 40, the inner diameter magnetic pole portion 412 is relatively close to the moving coil component 43, and the field line group 431 is located at the inner diameter magnetic pole portion 412. When the outer magnetic pole portion 411 is N pole and the inner magnetic pole portion 412 is S pole between the outer magnetic pole portion 44 and the inner magnetic pole portion 44, the N pole is transmitted to the magnetic core 44 and back to the S pole through the magnetically permeable casing 40 to form a substantially closed loop. In the form of a permanent magnet magnetic circuit, the magnetic force is transmitted in the cavity 48 during the transmission process and the housing 40 provides the transmission force for the magnetic force during the transmission of the magnetic force. The top wall portion 401 and the upper end surface of the permanent magnet 41 are formed. The first distance L1, a second distance L2 is formed between the inner diameter magnetic pole portion 412 and the side wall of the magnet core 44. The first distance L1 is greater than the second distance L2. For example, the values of the first distance L1 and the second distance L2 are the same or When the first distance L1 is close or the second distance L2 is smaller, according to The closer it is, the easier it is to converge. At the time of magnetic force transmission, at least a considerable part of the magnetic force will be concentrated at the first distance L1 when the N pole is transmitted through the shell 40 as a magnetizing conductor, thereby greatly reducing the The magnetic force is concentrated, that is, it will cause more magnetic losses towards the first distance L1. When the electromagnetic drive device 4 is connected to a DC power source under the condition of the current, the field line group 431 forms an axial magnetic field and condenses the radial direction of the second distance L2. Interactions between magnetic fields generate traction or repulsion in the axial direction to drive the moving coil assembly 43 to reciprocate along the axial direction of the magnet core 44. For example, if the value of the first distance L1 is smaller than the value of the second distance L2, According to the principle that the closer the distance is, the easier it is to concentrate. The magnetic force of the S pole will be more concentrated on L1 instead of L2. The excitation line group 431 cannot ensure sufficient magnetic force from the second distance L2 and cannot guarantee the moving coil assembly 43 The normal operation of the electromagnetic drive device affects the reliability of the overall operation of the electromagnetic drive device. In the present invention, the first interval L1 is designed to be larger than the second interval L2 in the current-carrying state. Compared with the first pitch L1, the magnetic force is more easily concentrated on the second pitch L2. The axial magnetic field generated by the moving coil assembly 43 and the radial magnetic field formed by focusing on the second pitch L2 and relative to the axial magnetic field generate mutual forces. The action further forms an axial repulsive force or traction force. Because the magnetic force is relatively concentrated on the second distance L2, the excitation component 431 can obtain sufficient magnetic thrust to drive the moving coil component 43 as a whole to reciprocate along the axis direction of the magnet core 44. That is, the magnetic force is more concentrated on the second distance L2, which can reduce the magnetic loss and enhance the magnetic concentrating effect of the electromagnetic driving device, which improves the magnetic effect and thereby relatively improves the reliability of the overall operation of the electromagnetic driving device and the gas proportional valve having the electromagnetic driving device. .

The following is a brief introduction to the permanent magnet 41 and the magnetically permeable magnet 42. The permanent magnet 41 has a substantially hollow ring structure, and can be provided with more than one inner and outer diameter radiation magnetization processing, which can be an integrated structure or a split structure. The permanent magnet 41 provided by the example includes an outer diameter magnetic pole portion 411 and an inner diameter magnetic pole portion 412, which are different magnetic poles. The outer diameter magnetic pole portion 411 and the inner wall of the housing 40, that is, the inner wall of the side wall portion 402, are attached. The inner diameter magnetic pole portion 412 It is close to the moving coil component 43. It should be noted that the term “fitting together” means that the two can be in direct contact or a small gap can be left. In the embodiment provided by the present invention, the outer diameter magnetic pole portion 411 may be magnetically conductive. The outer casing 40 transmits magnetic force to the magnetically permeable core 44 and then the magnetic permeable core 44 loops to form a relatively closed-loop permanent magnet magnetic circuit. As the magnetically permeable outer casing 40 during the magnetic force transmission process, it can provide the magnetic force transmission for the permanent magnet 41. And the magnetic circuit transmission process is completed in the cavity 48, and the magnetic force is relatively concentrated on the second distance L2. By optimizing the design of the electromagnetic drive device structure, the generation of magnetic loss is greatly reduced, and the magnetic field is improved. It can thus be relatively improve reliability of the gas proportional valve actuation.

In order to achieve better positioning of the permanent magnet 41 in the cavity 48, the electromagnetic driving device 4 is also provided with a sheath component 46. The sheath component 46 can be injection-molded, such as plastic parts, for protecting and positioning the permanent magnet 41. The sheath assembly 46 includes a first sheath 461 and a second sheath 462. The first sheath 461 is located at a first distance L1 and the first sheath 461 is respectively connected to the top wall portion 401 and the permanent magnet 41. The upper end portion of the cover abuts, the second sheath 462 abuts the lower end portion of the permanent magnet 41, and the convex portion 472 of the cover plate 47 presses against the second sheath 462. The sheath assembly 46 restricts the axial direction of the permanent magnet 41 to prevent the permanent magnet 41 from being moved in the axial direction.

The present invention also provides a gas proportional valve having the electromagnetic driving device 4. As shown in FIG. 2, the gas proportional valve further includes a valve plug 4b, the valve plug 4b includes a valve plug body 41b and a diaphragm 42b, and the electromagnetic driving device 4 It also includes an adjustment mechanism 45 that adjusts the initial position of the wire frame 432. The adjustment mechanism 45 includes an adjustment lever 451, a spring seat 452, and a spring 453. The adjustment lever 451 is screwed into the magnet core 44 to initialize the wire frame 432. The position is adjusted. The spring seat 452 is fixed to the end boss of the adjustment rod 451. The spring 453 is assembled on the spring seat 452 and the inner boss of the wire frame 432. The moving coil assembly 43 includes a field wire group 431 and a wire frame 432. The field wire group 431 is fixedly mounted on the wire frame 432. The wire frame 432 includes a wire frame head 432a. The wire frame head 432a can abut against the valve plug 4b. The adjustment mechanism 45 The initial position of the wire frame 432 is adjusted. After the DC power of the electromagnetic drive device, the exciting line group 431 generates an axial magnetic field. The second distance L2, where the magnetic force is concentrated, has a radial magnetic field relative to the axial magnetic field. Magnetic field interaction forms mutual axial traction or repulsive force to drive the moving coil assembly 43 to move along the axial direction of the magnet core 44. The moving coil assembly 43 can drive the valve plug 4b to move axially downward to approach the third valve port 13 To regulate the gas flow through the valve.

The gas proportional valve shown in FIG. 3 includes a main valve seat 1, which is provided with an inlet 1a and an outlet 1b. Gas flows from the inlet 1a and flows out from the outlet 1b. The main valve seat 1 can be die-casted by aluminum alloy. The valve seat 1 is fixedly connected with an electromagnetic drive assembly 2, a servo drive assembly 3, and an electromagnetic drive device 4. The inner cavity of the main valve seat 1 is provided with a pressure difference adjustment device 5. The main valve seat 1 is also provided with a first valve corresponding to the valve. A valve port 11, a second valve port 12, a third valve port 13, and a main valve port 14. The gas proportional valve can be led by the electromagnetic drive assembly 2 and the servo drive assembly 3 as the gas safety switch. When the electromagnetic drive assembly 2 and the servo drive When one of the three power supplies is cut off or two power supplies are cut off at the same time, the gas flow will be cut off. The electromagnetic drive device 4 and the differential pressure adjustment device 5 dominate the gas flow adjustment function. This is done by controlling the linear electromagnetic drive device 4 to supply current to the electromagnetic drive device 4 The opening of the differential pressure adjustment device 5 is driven indirectly to achieve precise adjustment of the gas flow rate through the main valve port 14. The inner cavity is also provided with a first channel 15 and a second channel 16, and the gas passes through the first valve port 11 and passes through the second port. Port 12 enters the first Channel 15 and second channel 16, since the third port 13 is normally open, gas flows from the third port 13 is discharged through outlet 1b through the relief holes 17, is connected to the combustion chamber outlet 1b.

The following briefly introduces a second embodiment provided by the present invention. The second embodiment is different from the first embodiment in the structure of the permanent magnet 41. The electromagnetic driving device includes a casing 40 and a magnet core 44. The casing 40 includes at least The magnetically permeable portion includes a top wall portion 401 and a side wall portion 402. The top wall portion 401 is fixedly connected to the magnetically permeable core 44. The outer periphery of the magnetically permeable core 44 is provided with a moving coil assembly 43. The magnet core 44 is reciprocated in the axial direction. The electromagnetic driving device is provided with a cavity 48. The electromagnetic driving device further includes a permanent magnet 41. The permanent magnet 41 is accommodated in the cavity 48 and the permanent magnet 41 is located on the outer periphery of the moving coil assembly 43. The permanent magnet 41 is provided with a boss portion 41a, and the boss portion 41a protrudes in the direction of the magnet guide core 44. A first distance L1 is formed between the top wall portion 401 of the housing 40 and the permanent magnet 41, and the boss portion 41a and the magnet guide are formed. A third pitch L3 is formed between the sidewalls of the core 44. The first pitch L1 is greater than the third pitch L3. By providing a boss portion 41a on the permanent magnet 41, for example, the S pole of the inner diameter magnetic pole portion 412 can be more magnetically concentrated. At the boss portion 41a, the first interval L1 is larger than the third interval. L3, according to the principle that the closer the magnetic field is, the easier it is to gather magnetism. Finally, the magnetic force is easier to gather at the third distance L3. The moving coil assembly 43 can receive sufficient magnetic thrust to operate. In this embodiment, the permanent magnet 41 includes outer diameter magnetic poles. Part 411 and inner diameter magnetic pole part 412, the outer diameter magnetic pole part 411 is in contact with the side wall part 402, the boss part 41a is close to the moving coil assembly 43, and the excitation line group 431 is located between the boss part 41a and the magnet core 44. The related functions and principles have been described in detail in the first embodiment, and will not be repeated here.

It should be noted that the permanent magnets of the electromagnetic driving device provided by the present invention may be an integrated structure or one or more separate structures. The embodiments provided by the present invention are described with the integrated permanent magnets.

The casing of the electromagnetic drive device provided by the invention has magnetic permeability and can provide magnetic force transmission for the permanent magnet. The permanent magnet can transmit magnetic force through the casing to the magnetic conductor core, and the magnetic conductor core circuit forms a closed-loop permanent magnetic circuit shape. Magnetic force transmission The process is completed in the cavity of the electromagnetic drive device, and the magnetic force is relatively concentrated at the second distance L2 or the third distance L3. When the moving coil component moves along the axial direction of the magnet core, it can sense enough magnetic thrust to ensure its The reliable axial operation improves the magnetic efficiency, and thus can be operated reliably with respect to the electromagnetic driving device and the gas proportional valve having the electromagnetic driving device.

It should be noted that the ordinal numbers such as "first and second" mentioned in the present invention are only for naming different parts, and should not be considered as restricting the relevant order of each part. The "" Orientation words such as "upper and lower" are also described based on the accompanying drawings provided by the present invention. The above are only preferred embodiments of the present invention. It should be noted that for those skilled in the art, On the premise that the invention is far away, several improvements and retouches can also be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims (10)

An electromagnetic driving device is characterized in that a cavity (48) is provided, the electromagnetic driving device includes a casing (40) and a magnetically permeable core (44), and the casing (40) includes at least a magnetically permeable portion, and The magnetic conductive portion includes a top wall portion (401) and a side wall portion (402). The top wall portion (401) is fixedly connected to the magnetic core (44), and an outer periphery of the magnetic core (44) is provided. A moving coil assembly (43) capable of reciprocating along an axial direction of the magnetically permeable core (44), the electromagnetic driving device further comprising a permanent magnet (41), the permanent magnet ( 41) received in the cavity (48) and the permanent magnet (41) is located at an outer peripheral portion of the moving coil assembly (43), between the top wall portion (401) and the permanent magnet (41) A first gap (L1) is formed, and a second gap (L2) is formed between the permanent magnet (42) and a side wall of the magnet core (44), and the first gap (L1) is greater than the The second pitch (L2). The electromagnetic drive device according to claim 1, wherein the permanent magnet (41) has a substantially annular structure, and includes an outer diameter magnetic pole portion (411) and an inner diameter magnetic pole portion (412). (411) relatively close to the outer circumferential surface of the permanent magnet (41), the inner diameter magnetic pole portion (412) is relatively close to the inner circumferential surface of the permanent magnet (41), and the outer diameter magnetic pole portion (411) is connected with The side wall portion (402) is attached, the inner diameter magnetic pole portion (412) is close to the moving coil assembly (43), and the second diameter (L2) is formed between the inner diameter magnetic pole portion (412) and the side wall. ). The electromagnetic drive device according to claim 2, characterized in that the moving coil assembly (43) includes an excitation line group (431) and a wire frame (432), and the excitation line group (431) is fixedly installed on the A wire frame (432), and the excitation line group (431) is located between the inner diameter magnetic pole portion (411) and the magnet core (44). An electromagnetic driving device is characterized in that a cavity (48) is provided, the electromagnetic driving device includes a casing (40) and a magnetically permeable core (44), and the casing (40) includes at least a magnetically permeable portion, and The magnetic conductive portion includes a top wall portion (401) and a side wall portion (402). The top wall portion (401) is fixedly connected to the magnetic core (44), and an outer periphery of the magnetic core (44) is provided. A moving coil assembly (43) capable of reciprocating along an axial direction of the magnetically permeable core (44), the electromagnetic driving device further comprising a permanent magnet (41), the permanent magnet ( 41) accommodated in the cavity (48), the permanent magnet (41) is provided with a boss portion (41a), the boss portion (41a) protrudes in the direction of the magnetic guide core (44), and the top A first space (L1) is formed between the wall portion (401) and the permanent magnet (41), and a third space is formed between the boss portion (41a) and the side wall of the magnet core (44). The pitch (L3), the first pitch (L1) is greater than the third pitch (L3). The electromagnetic drive device according to claim 4, wherein the permanent magnet (41) includes an outer diameter magnetic pole portion (411) and an inner diameter magnetic pole portion (412), and the outer diameter magnetic pole portion (411) is relatively close to the magnetic pole portion. The outer circumferential surface of the permanent magnet (41), the inner diameter magnetic pole portion (412) is relatively close to the inner circumferential surface of the permanent magnet (41), the outer diameter magnetic pole portion (411) and the side wall portion (402) ), The boss portion (41a) is close to the moving coil assembly (43), and the third gap (L3) is formed between the boss portion (41a) and the side wall. The electromagnetic drive device according to claim 5, characterized in that the moving coil assembly (43) comprises a field wire group (431) and a wire frame (432), and the field wire group (431) is fixedly installed on the A wire frame (432), and the excitation line group (431) are located between the boss portion (41a) and the magnet core (44). The electromagnetic driving device according to any one of claims 1-6, wherein the electromagnetic driving device further comprises a sheath assembly (46), including a first sheath (461) and a second sheath (462) The first sheath (461) is located at the first distance (L1) and abuts the top wall portion (401) and the upper end of the permanent magnet (41), and the second sheath (462) ) And the lower end of the permanent magnet (41). The electromagnetic drive device according to claim 7, characterized in that the electromagnetic drive device further comprises a cover plate (47), the casing (40) and the cover plate (47) are fixedly connected, and the cover plate (47) 47) comprises a parallel portion (471) and a protruding portion (472), and the protruding portion (472) presses against the second sheath (462). The electromagnetic drive device according to claim 1 or 4, characterized in that the electromagnetic drive device comprises a valve plug (4b). The valve plug (4b) includes a valve plug body (41b) and a diaphragm (42b), the electromagnetic driving device further includes an adjustment mechanism (45), and the moving coil assembly (43) includes an excitation line group (431) and A wire frame (432), the exciting line group (431) is fixedly installed on the wire frame (432), the wire frame (432) includes a wire frame head (432a), and the wire frame head (432a) can communicate with The valve plug (4b) is abutted and matched, the adjustment mechanism (45) adjusts the initial position of the wire frame (432), and the moving coil assembly (43) can drive the valve plug (4b) shaft Move down. The gas proportional valve is characterized by comprising a main valve seat (1), which is provided with an inlet (1a) and an outlet (1b), and the main valve seat (1) is fixedly connected with an electromagnetic drive component (2) a servo drive assembly (3) and an electromagnetic drive device, the inner cavity of the main valve seat (1) is further provided with a pressure difference adjustment device (5), the electromagnetic drive assembly (2) and the servo drive The component (3) leads the safety switching function of the gas proportional valve, and the electromagnetic drive device and the pressure difference adjustment device (5) lead the gas flow adjustment function.

Images