Electromagnetic drive device and gas proportional valve having the same

Abstract

The electromagnetic driving device is provided with a cavity, and comprises a shell, a magnetic conducting core, the shell at least comprises a magnetic conducting part, the magnetic conducting part comprises a top wall part and a side wall part, the top wall part is fixedly connected with the magnetic conducting core, the outer periphery of the magnetic conducting core is provided with a moving coil assembly, the moving coil assembly can reciprocate along the axial direction of the magnetic conducting core, the electromagnetic driving device further comprises at least one permanent magnet and a first magnetic conducting body, the permanent magnet and the first magnetic conducting body are located in the cavity, the top wall part is not in direct contact with the first magnetic conducting body, the permanent magnet is substantially arc-shaped, the permanent magnet is provided with an inner wall surface and an outer wall surface, further comprises an outer side magnetic pole part and an inner side magnetic pole part, the outer side magnetic pole part is directly or indirectly matched with at least part of the side wall part, the inner side magnetic pole part is matched with the first magnetic conducting body, the electromagnetic driving device provided by the application can relatively improve the magnetic leakage phenomenon and improve the actuating reliability of the electromagnetic driving device.

Description

Technical Field

[0001] This invention relates to the fields of electromagnetic drive control and gas control technology, and particularly to an electromagnetic drive device and a gas proportional valve using the electromagnetic drive device. Background Technology

[0002] The electromagnetic drive device includes a permanent magnet, a magnetic core, and a coil component. The magnetic field generated by the energized electromagnetic coil interacts with the magnetic field generated by the permanent magnet, thereby driving the valve plug to reciprocate. The greater the magnetic force obtained by the coil component, the more effective it is in controlling the actuation accuracy of the valve plug. However, electromagnetic drive devices often suffer from magnetic leakage, which affects the electromagnetic force obtained by the moving coil component. Therefore, how to improve the magnetic leakage phenomenon of electromagnetic drive devices is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0003] The main objective of this invention is to provide an electromagnetic drive device and a gas proportional valve having the electromagnetic drive device, the structure of which can improve the magnetic leakage phenomenon.

[0004] An electromagnetic drive device is provided with a cavity. The electromagnetic drive device includes a housing and a magnetic core. The housing includes at least a magnetically conductive part, which includes a top wall and a side wall. The top wall is fixedly connected to the magnetic core. A moving coil assembly is provided on the outer periphery of the magnetic core. The moving coil assembly can reciprocate along the axial direction of the magnetic core. The electromagnetic drive device also includes at least one permanent magnet and a first magnetic core. The permanent magnet and the first magnetic core are located in the cavity. The top wall is not in direct contact with the first magnetic core. The permanent magnet has a generally arc-shaped structure and has an inner wall and an outer wall. It also includes an outer magnetic pole and an inner magnetic pole. The outer magnetic pole is relatively close to the outer wall, and the inner magnetic pole is relatively close to the inner wall. The outer magnetic pole is directly or indirectly attached to at least part of the side wall, and the inner magnetic pole is attached to the first magnetic core.

[0005] This invention also provides a gas proportional valve, including a main valve seat with an inlet and an outlet. Gas enters from the inlet and flows out from the outlet. The main valve seat is fixedly connected to a first electromagnetic drive assembly, a second electromagnetic drive assembly, and an electromagnetic drive device. The inner cavity of the main valve seat is also provided with a differential pressure regulating device. The main valve seat has a first valve port corresponding to the first electromagnetic drive assembly, a second valve port corresponding to the second electromagnetic drive assembly, a third valve port corresponding to the electromagnetic drive device, and a main valve port corresponding to the differential pressure regulating device. The first electromagnetic drive assembly and the second electromagnetic drive assembly mainly control the safety switch function of the gas proportional valve, and the electromagnetic drive device and the differential pressure regulating device mainly control the gas flow rate.

[0006] The electromagnetic drive device provided by this invention includes a housing and a magnetic core. The housing includes at least a magnetically conductive portion, which includes a top wall and a side wall. The top wall is fixedly connected to the magnetic core. The electromagnetic drive device also includes at least one permanent magnet and a first magnetically conductive body. The electromagnetic drive device has a cavity in which the permanent magnet and the first magnetically conductive body are located. The top wall is not in direct contact with the first magnetically conductive body. The permanent magnet has an outer wall surface and an inner wall surface, and also includes an outer magnetic pole portion and an inner magnetic pole portion. The outer magnetic pole portion is relatively close to the outer wall surface. The inner magnetic pole portion is relatively close to the inner wall surface, and the outer magnetic pole portion is directly or indirectly attached to at least part of the side wall portion. The inner magnetic pole portion is attached to the first magnetic conductor. In this scheme, the outer magnetic pole portion is directly or indirectly attached to at least part of the side wall portion, and the outer shell can provide magnetic force transmission for the permanent magnet. The inner magnetic pole portion is attached to the first magnetic conductor, and the first magnetic conductor can provide magnetic force transmission for the permanent magnet. The permanent magnet and the first magnetic conductor are located in the cavity of the electromagnetic drive device. When transmitting magnetic force, leakage magnetic field can be relatively reduced and the leakage magnetic field phenomenon can be improved. Attached Figure Description

[0007] Figure 1 A longitudinal sectional view of an electromagnetic drive device (without valve plug) according to a first embodiment of the present invention;

[0008] Figure 2 A cross-sectional view of an electromagnetic drive device (without valve plug) according to a first embodiment of the present invention;

[0009] Figure 3 Longitudinal and transverse sectional views of an electromagnetic drive device (without valve plug) according to a second embodiment of the present invention;

[0010] Figure 4 A perspective view of the permanent magnet shape of the electromagnetic drive device (without valve plug) according to the second embodiment of the present invention;

[0011] Figure 5 Longitudinal and transverse sectional views of an electromagnetic drive device (without valve plug) according to a third embodiment of the present invention;

[0012] Figure 6 A perspective view of the permanent magnet and the second magnetic conductor of the electromagnetic drive device according to the third embodiment of the present invention;

[0013] Figure 7 Longitudinal and transverse sectional views of the electromagnetic drive device (without valve plug) according to the fourth embodiment of the present invention;

[0014] Figure 8 A perspective view of the permanent magnet, the first magnetic conductor, and the second magnetic conductor of the electromagnetic drive device according to the fourth embodiment of the present invention;

[0015] Figure 9 Overall cross-sectional view of a gas proportional valve with an electromagnetic drive device provided by the present invention.

[0016] like Figures 1-5As shown, the electromagnetic drive device 4 includes a housing 40 and a magnetic core 44. The housing 40 includes at least a magnetically conductive portion, which 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. A moving coil assembly 43 is provided on the outer periphery of the magnetic core 44. The moving coil assembly 43 is capable of reciprocating along the axial direction of the magnetic core 44. The electromagnetic drive device 4 has a cavity 48. The electromagnetic drive device 4 also includes at least one permanent magnet and a first magnetically conductive body 4. 2. The permanent magnet 41 and the first magnetic conductor 42 are located in the cavity 48. The top wall 401 is not in direct contact with the first magnetic conductor 42. The permanent magnet 41 is generally arc-shaped. The permanent magnet has an inner wall surface and an outer wall surface, and also includes an outer magnetic pole portion and an inner magnetic pole portion. The outer magnetic pole portion is relatively close to the outer wall surface of the permanent magnet, and the inner magnetic pole portion is relatively close to the inner wall surface of the permanent magnet. The outer magnetic pole portion is directly or indirectly attached to at least part of the side wall portion 402 of the outer shell 40, and the inner magnetic pole portion is attached to the first magnetic conductor 42. It should be noted that the arc-shaped structure here can be C-shaped, tile-shaped, or a semi-circular, roughly arc-shaped permanent magnet structure. The outer shell 40 has a notch 404, which is located on the side wall 402. The electromagnetic drive device also includes a terminal sleeve assembly A, which is an integrally injection-molded structure including a sleeve 46 and a terminal component 50. The terminal sleeve assembly A is adapted to the notch 404. The outer magnetic pole portion of the permanent magnet is directly or indirectly attached to at least part of the side wall 402. It should be noted that the terminal sleeve assembly A can also be set as a whole on the outer periphery of the outer shell 40, in which case the outer magnetic pole portion of the permanent magnet can be directly or indirectly attached to the entire side wall. The outer shell 40 generally covers the permanent magnet and the first magnetic conductor 42.Specifically, the outer shell 40 is fixedly connected to the magnetic core 44 and the cover plate 47 to roughly form the cavity 48 of the electromagnetic drive device 4. The outer shell includes at least a magnetically conductive part. It should be noted that the magnetically conductive part here refers to a component with magnetic conductivity. The outer shell 40 may only include the magnetically conductive part, that is, the entire outer shell 40 may be stamped from a magnetically conductive metal sheet. The outer shell 40 may also be made of low carbon steel or other magnetically conductive materials. Alternatively, the magnetically conductive part may be used as an insert and injection molded with plastic parts or other materials to form the outer shell 40, as long as the outer shell 40 has magnetic conductivity. The outer shell 40 is generally cylindrical in shape. The magnetic core 44 is machined from pure iron or low carbon steel magnetically conductive material. The top wall 401 and the magnetic core 44 may be fixedly connected by welding or riveting. The electromagnetic drive device 4 includes a moving coil assembly 43, which includes an excitation wire group 431 and a wire frame 432. The excitation wire group 431 and the wire frame 432 The permanent magnet and the first magnetic conductor 42 are fixedly connected and located in the cavity 48 and on the outer periphery of the moving coil assembly 43. In the electromagnetic drive device structure provided by the present invention, the inner magnetic pole of the permanent magnet is in contact with the first magnetic conductor 42, and magnetic force can be transmitted through the first magnetic conductor 42. The outer magnetic pole of the permanent magnet can be directly or indirectly in contact with at least part of the side wall 402 of the outer shell 40. The outer shell 40 can provide direct or indirect magnetic force transmission to the permanent magnet. The magnetic force transmission process is completed in the cavity 48, which can relatively reduce the occurrence of magnetic leakage or magnetic loss. This structure can improve the magnetic conduction effect, thereby relatively improving the axial operation reliability of the moving coil assembly 43, and thus improving the operation reliability of the electromagnetic drive device and the gas proportional valve with the electromagnetic drive device as a whole.

[0017] like Figure 1The diagram shows a first embodiment of the electromagnetic drive device provided by the present invention. In this embodiment, the number of permanent magnets 41a is set to two, including a first permanent magnet 411a and a second permanent magnet 412a. Setting the number of permanent magnets 41a to two makes it easier for the first permanent magnet 411a and the second permanent magnet 412a to be magnetized and has a higher unit magnetic density, resulting in good magnetic properties. The first permanent magnet 411a and the second permanent magnet 412a are located between the side wall portion 402 and the first magnetic conductor 42. The first permanent magnet 411a has a first outer wall surface and a first inner wall surface. The first permanent magnet 411a includes a first outer magnetic pole portion 4111a and a second inner magnetic pole portion 4112a. The first outer magnetic pole portion 4111a is relatively close to the first outer wall surface, and the second inner magnetic pole portion 4112a is relatively close to the first inner wall surface. The second permanent magnet 412a... The a-type structure has a second outer wall surface and a second inner wall surface, including a third outer magnetic pole portion 4113a and a fourth inner magnetic pole portion 4114a. The third outer magnetic pole portion 4113a is relatively close to the second outer wall surface, and the fourth inner magnetic pole portion 4114a is relatively close to the second inner wall surface. The first outer magnetic pole portion 4111a and the third outer magnetic pole portion 4113a are in contact with at least a portion of the outer shell 40, that is, in contact with at least a portion of the side wall portion 402. The second inner magnetic pole portion 4112a and the fourth inner magnetic pole portion 4114a are in contact with the first magnetic conductor 42. It should be noted that the contact here means that the two can be in direct contact or have a certain gap. The first permanent magnet 411a and the second permanent magnet 412a are roughly arc-shaped. If the magnetic pole of the first outer magnetic pole portion 4111a and the third outer magnetic pole portion 4113a is set to N, The magnetic poles of the second inner magnetic pole portion 4112a and the fourth inner magnetic pole portion 4114a are S poles. Since the first outer magnetic pole portion 4111a and the third outer magnetic pole portion 4113a are in contact with at least part of the outer shell 40, the N pole is transmitted through the magnetically conductive outer shell 40 to the magnetic core 44 and then back to the S pole through the magnetic core 44. Since the second inner magnetic pole portion 4112a and the fourth inner magnetic pole portion 4114a are in contact with the first magnetic conductor 42, the S pole is actuated by the magnetic force transmitted through the first magnetic conductor 42. The magnetic force is relatively concentrated on the magnetic protrusion 42a of the first magnetic conductor 42 and returns to the N pole through the magnetic core 44 from the outer shell 40. The magnetic field is formed in a closed-loop permanent magnet circuit within the cavity 48. Magnetic force is transmitted entirely within the cavity 48. The outer shell 40 and the first magnetic conductor 42, acting as magnetic conductors, provide magnetic force transmission, thus mitigating the leakage or loss of magnetic flux mentioned in the prior art, further enhancing magnetic efficiency, and consequently improving the operational reliability of the electromagnetic drive device. The electromagnetic drive device also includes a valve plug 51, which comprises a valve plug body 51a and a diaphragm 51b. Due to the overall improvement in magnetic efficiency of the electromagnetic drive device...After the electromagnetic drive device is energized, the excitation coil assembly 431 can sense sufficient magnetic thrust, allowing it to move axially downwards along the axis of the magnetic core 44. This, in turn, drives the valve plug 51 to gradually approach the third valve port 13 to regulate the gas flow through that port. This can relatively improve the leakage magnetic field or magnetic loss phenomenon mentioned in the background art, and further enhance the control of the valve plug 51. Regarding the actuation accuracy, it should be noted that either the first permanent magnet 411a or 412a can be omitted here. Using only one permanent magnet can achieve the same technical effect. If 412a is omitted, the N pole of the first outer magnetic pole portion 4111a of the first permanent magnet 411a transmits magnetic force through a magnetically conductive outer shell 40. The outer shell 40 is roughly an annular cylindrical structure. Based on the magnetic force transmission, the entire outer shell 40 can be filled with N poles. The S pole of the second inner magnetic pole portion 4112a transmits magnetic force through the first magnetic conductor 42, causing the entire first magnetic conductor 42 to be filled with S poles, which are relatively concentrated on the magnetically conductive protrusion 42a. Through the circuit of the magnetic core 44, a relatively closed-loop permanent magnet circuit is formed in the cavity 48. Furthermore, after the electromagnetic drive device is energized, the excitation coil assembly 43 forms a certain axial magnetic field in the axial direction. Correspondingly, the magnetically conductive protrusion 42a and... A gap is formed between the sidewalls of the magnetic core 44, and a radial magnetic field relative to the axial magnetic field is formed at this gap. The magnetic fields of the two interact, and the moving coil assembly 43 can sense the corresponding magnetic thrust and reciprocate along the axial direction of the magnetic core 44. Specifically, the top wall 401 of the electromagnetic drive device is not in direct contact with the first magnetic body 42, and a fifth gap L5 is formed between the top wall 401 and the first magnetic body 42. A sixth gap L6 is formed between the magnetic boss 42a and the sidewall of the magnetic core 44, and the fifth gap L5 is greater than the sixth gap L6. During the magnetic force transmission process, the N pole of the first outer magnetic pole part 4111a is transmitted to the top wall part 401 through the sidewall part 402 and then back through the magnetic core 44. If the top wall part 401 is in direct contact with the first magnetic body 42, the N pole can directly reconnect with the S pole of the second inner magnetic pole part 4112a, towards the sixth gap L6. The reduction of magnetic concentration, by setting the fifth spacing L5 to be larger than the sixth spacing L6, can further improve the phenomenon of magnetic leakage or magnetic loss, so that the magnetic energy is more concentrated in the sixth spacing L6, enhancing the magnetic effect. As the magnetic force is concentrated in the sixth spacing L6, the electromagnetic force is larger, and when the moving coil assembly 43 is actuated, it can sense sufficient magnetic thrust, thereby performing a more reliable reciprocating motion along the axial direction of the magnetic core 44. This further improves the overall actuation reliability of the electromagnetic drive device and the gas proportional valve with the electromagnetic drive device. In addition, three or more permanent magnets 41a with a roughly arc-shaped structure can also be provided, with their outer magnetic poles attached to the outer shell 40 and their inner magnetic poles attached to the first magnetic core 42. The specific technical effects and magnetic force transmission principle have been described and will not be repeated here.

[0018] The following is combined Figure 2The second embodiment of the electromagnetic drive device provided by the present invention is described. The electromagnetic drive device 4 is provided with two permanent magnets 41b, including a first permanent magnet 411b and a second permanent magnet 412b. Unlike the first embodiment, the electromagnetic drive device also includes a second magnetic conductor 49. The second magnetic conductor 49 includes an outer peripheral portion 491 and an inner peripheral portion 492. The second magnetic conductor 49 is generally in the form of a hollow ring structure. The first permanent magnet 411b and the second permanent magnet 412b are located between the first magnetic conductor 411b and the second magnetic conductor 49. The second magnetic conductor 49 is located between the permanent magnet 41b and the outer shell 40. The outer peripheral portion 491 is in contact with at least a portion of the side wall portion 402 of the outer shell 40, and at least a portion of the inner peripheral portion 492 is in contact with the permanent magnet assembly 41b. The first permanent magnet 411b includes a first outer magnetic pole portion 4111b and a second inner magnetic pole portion 4112b. The second permanent magnet 412b includes a third outer magnetic pole portion 4113b and a fourth inner magnetic pole portion 4114b. The first outer magnetic pole portion 4111b and the third outer magnetic pole portion 4113b are in contact with at least a portion of the inner periphery 492 of the second magnetic conductor 49. The second inner magnetic pole portion 4112b and the fourth inner magnetic pole portion 4114b are in contact with the first magnetic conductor 42. The outer periphery 491 is in contact with at least a portion of the outer shell. The sidewall portion 402 of 40 is attached to each other. The permanent magnet 41b, namely the first permanent magnet 411b and the second permanent magnet 412b, is indirectly attached to the outer shell 40 through the second magnetic conductor 49. The magnetic force transmission principle is briefly explained below. The first outer magnetic pole portion 4111b and the third outer magnetic pole portion 4113b are set as N poles, and the second inner magnetic pole portion 4112b and the fourth inner magnetic pole portion 4114b are set as S poles. Because the first outer magnetic pole portion 4111b and the third outer magnetic pole portion 4113b are attached to at least part of the inner peripheral portion 492. The N pole is provided with magnetic force transmission by the second magnetic conductor 49 and transmitted to the magnetically conductive outer shell 40. The second inner magnetic pole portion 4112b and the fourth inner magnetic pole portion 4114b are in contact with the first magnetic conductor 42. The outer shell 40 is magnetically conductive and is filled with the N pole, which can transmit the magnetic force to the magnetic core 44 and from there to the magnetic pole S, forming a relatively closed-loop permanent magnet circuit in the cavity. In this scheme, the first magnetic conductor 42, the second magnetic conductor 49 and the outer shell 40 can all provide magnetic force transmission for the permanent magnet 41b. The magnetic force transmission takes place in the cavity 48 and the arc-shaped permanent magnet 41b has a stronger unit magnetic density and is easier to magnetize, resulting in relatively higher magnetic performance. This can further improve magnetic efficiency and relatively improve the phenomenon of magnetic leakage or magnetic loss.The S poles are ultimately concentrated at the sixth spacing L6, and the fifth spacing L5 is larger than the sixth spacing L6. When the moving coil assembly 43 performs axial movement, it can sense a strong magnetic thrust and reliably reciprocate along the axial direction of the magnetic core 44. The top wall 401 of the electromagnetic drive device is not in direct contact with the first magnetic core 42, and the top wall 401 and the first magnetic core 42 are not in direct contact. A fifth gap L5 is formed between the magnetic protrusion 42a and the sidewall of the magnetic core 44, and a sixth gap L6 is formed between them. The fifth gap L5 is larger than the sixth gap L6. During the magnetic force transmission process, the N pole of the first outer magnetic pole part 4111a is transmitted to the top wall part 401 through the sidewall part 402 and then through the magnetic core 44. The top wall part 401 does not directly contact the first magnetic body 42, but directly contacts the S pole of the second inner magnetic pole part 4112a, so as to reduce the magnetic loss towards the sixth gap L6. Setting the fifth gap L5 to be larger than the sixth gap L6 can further improve the phenomenon of magnetic leakage or magnetic loss, so that the magnetic force can be relatively concentrated in the sixth gap L6, improving the magnetic effect. When the electromagnetic force is larger, the moving coil assembly 43 can sense enough magnetic thrust to perform a more reliable operation, thereby improving the operation reliability of the electromagnetic drive device and even the entire gas proportional valve.

[0019] It should be noted that the technical effect of the present invention can also be achieved by eliminating one of the first permanent magnet 411b or the second permanent magnet 412b. For example, if the second permanent magnet 412b is eliminated, the N pole of the first outer magnetic pole portion 4111b of the first permanent magnet 411b is transmitted by the second magnetic conductor 49, and the S pole of the second magnetic pole 4112b is transmitted by the first magnetic conductor 42. Since the second magnetic conductor 49 is filled with the N pole, the N pole is transmitted from the second magnetic conductor 49 to the outer shell 40 to the magnetic core 44 and then back to the S pole through its circuit. The S pole is more concentrated on the magnetic protrusion 42a. In the electromagnetic drive device structure provided in this embodiment, the first magnetic conductor 42, the second magnetic conductor 49, and the outer shell 40 provide magnetic force transmission for the permanent magnet assembly 41b, and the magnetic force transmission occurs within the cavity 48. This can relatively improve the magnetic leakage phenomenon, relatively enhance the magnetic conduction effect and magnetic concentration effect, and further increase the electromagnetic force, providing a certain guarantee for the reliable operation of the moving coil assembly 43. It should be noted that three or more permanent magnets 41b with a roughly arc-shaped structure can also be set. The relevant technical effects and magnetic force transmission principle have been described in detail and will not be repeated here.

[0020] The following is combined Figure 3This invention describes a third embodiment of the electromagnetic drive device. The structure of this electromagnetic drive device includes two permanent magnets 41c, comprising a first permanent magnet 411c and a second permanent magnet 412c. The difference from the electromagnetic drive structure in the second embodiment lies in the addition of a second magnetic conductor 49'. The second magnetic conductor 49' includes an outer peripheral portion 491' and an inner peripheral portion 492'. The outer peripheral portion 491' is in contact with at least a portion of the sidewall portion 402. The first permanent magnet 411c includes a first outer magnetic pole portion 4111c and a second inner magnetic pole portion 4112c. The second permanent magnet 412c includes a third outer magnetic pole portion 4113c and a fourth inner magnetic pole portion 4114c. The first outer magnetic pole portion 4111c and the third outer magnetic pole portion 4113c are in contact with at least a portion of the inner peripheral portion 492'. The first protrusion 493' and the second protrusion 494' are included, as well as the first recess 495' and the second recess 496' that are recessed relative to the first protrusion 493' and the second protrusion 494'. The first protrusion 493' and the second protrusion 494' protrude towards the first magnet 42 relative to the first recess 495' and the second recess 496'. The first protrusion 493' is adapted to the shape of the first permanent magnet 411c and the second protrusion 495' and the second recess 496' are recessed relative to the first magnet 411c. A protrusion 493' fits into the first outer magnetic pole portion 4111c, and a second protrusion 494' is adapted to the shape of the second permanent magnet 412c and fits into the third outer magnetic pole portion 4113c. The first permanent magnet 411c and the second permanent magnet 412c are located between the first magnetic conductor 42 and the second magnetic conductor 49'. For example, if the first outer magnetic pole portion 4111c and the third outer magnetic pole portion 4113c are defined as N... The second inner magnetic pole portion 4112c and the fourth inner magnetic pole portion 4114c are S poles. The N pole is provided with magnetic force transmission to the outer shell 40 through the second magnetic conductor 49'. The S pole is provided with magnetic force transmission by the first magnetic conductor 42 and is relatively concentrated on the magnetic protrusion 42a. In order to reduce magnetic interference between the N pole of the inner peripheral portion 492' of the second magnetic conductor 49' and the S pole of the first magnetic conductor, a second gap L2 is formed between the first recess 495' or the second recess 496' and the first magnetic conductor 42. The first protrusion 493 A first gap L1 is formed between the second protrusion 494 and the first magnetic conductor 42. The second gap L2 is greater than the first gap L1. Setting the second gap L2 to be greater than the first gap L1 can effectively reduce the magnetic interference between the N pole of the inner periphery 492' of the second magnetic conductor 49' and the S pole of the first magnetic conductor. When the magnetic force is transmitted, the second magnetic conductor 49' can conduct enough N poles to the side wall of the outer shell 40 to reduce the magnetic loss phenomenon caused by the second gap L2. The permanent magnet 41c can also be provided with only one, three or more. The related technical effects and structural matching methods will not be described in detail.

[0021] The following is combined Figure 4 This invention describes a fourth embodiment of the electromagnetic drive device. In this embodiment, the number of permanent magnets 41d is set to two, including a first permanent magnet 411d and a second permanent magnet 412d. The first permanent magnet 411d has a first outer magnetic pole portion 4111d and a second inner magnetic pole portion 4112d, and the second permanent magnet 412d has a third outer magnetic pole portion 4113d and a fourth inner magnetic pole portion 4114d. This embodiment differs from the third embodiment in the structure of the first magnetic conductor 42'. The electromagnetic drive device includes a first magnetic conductor 42' and a second magnetic conductor 49a, wherein the first magnetic conductor 42' has a body portion 421' and a first extension portion 422' protruding outward from the body portion 421'. The second extension 423' and the first extension 422' are adapted to the first permanent magnet 411d, and the second extension 423' are adapted to the second permanent magnet 412d. The second magnetic conductor 49a includes a first protrusion 493a and a second protrusion 494a, as well as a first recess 495a and a fourth recess 496a that are recessed relative to the first protrusion 493a and the second protrusion 494a. The first permanent magnet 411d is adapted to the first recess 495a, and the second permanent magnet 412d is adapted to the second recess 496a. In order to reduce the magnetic interference between the inner periphery 492a of the second magnetic conductor 49a and the first magnetic conductor 42', the first protrusion 493a... A third gap L3 is formed between the second protrusion 494a and the first magnetic conductor 42', and a fourth gap L4 is formed between the first recess 495a and the fourth recess 496a and the first magnetic conductor 42'. The third gap L3 is greater than the fourth gap L4.

[0022] It should be noted that the permanent magnets provided by this invention can be made of materials such as ferrite or neodymium iron boron. When the number of permanent magnets is set to two, they can be arranged symmetrically with the central axis of the moving coil assembly 43 as the boundary, or the two permanent magnets can be arranged relatively close to each other. It should also be noted that the shapes of the first permanent magnet and the second permanent magnet can be the same or different and can be used interchangeably in various embodiments. The electromagnetic drive device also includes a terminal sleeve assembly A, which includes a sleeve assembly 46 and a terminal component 50. The sleeve assembly 46 includes a first sleeve 461 and a second sleeve 462. The sleeve can be made of insulating material. The first sleeve 461 is located at the fifth spacing L5. The first sleeve 461 abuts against the top wall 401 and against the upper end of the first magnetic conductor 42 and the permanent magnet. The second sleeve 462... The electromagnetic drive device also includes a cover plate 47, which abuts against the lower end of the first magnetic conductor 42 and the permanent magnet. The outer shell 40 is fixedly connected to the cover plate 47. The outer shell 40 also includes an extension 403 extending outward from the side wall portion 402. The cover plate 47 includes a flat plate portion 471 and a protrusion portion 472. The extension portion 403 is adapted to the flat plate portion 47. The two can be fixedly connected by screws or welding. The protrusion portion 472 presses against the second sheath 462.

[0023] The present invention also provides a gas proportional valve, which includes the aforementioned electromagnetic drive device and a main valve seat 1. The main valve seat 1 has an inlet 1a and an outlet 1b. Gas enters from the inlet 1a and flows out from the outlet 1b. The main valve seat 1 is fixedly connected to a first electromagnetic drive assembly 2, a second electromagnetic drive assembly 3, and an electromagnetic drive device 4. The inner cavity of the main valve seat 1 is also provided with a differential pressure regulating device 5. The main valve seat 1 has a first valve port 11 corresponding to the first electromagnetic drive assembly 2, a second valve port 12 corresponding to the second electromagnetic drive assembly 3, a third valve port 13 corresponding to the electromagnetic drive device 4, and a main valve port 14 corresponding to the differential pressure regulating device 5. The first electromagnetic drive assembly 2 and the second electromagnetic drive assembly 3 mainly control the safety switch function of the gas proportional valve, and the electromagnetic drive device 4 and the differential pressure regulating device 5 mainly control the gas flow rate.

[0024] It should be noted that the ordinal numbers such as "first" and "second" mentioned in this invention are merely for distinguishing different parts and should not be considered as limiting the order of the parts. The directional terms such as "upper," "lower," "inner," and "outer" mentioned in this invention are also described based on the accompanying drawings provided in this specification. The above are merely preferred embodiments of this invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. Electromagnetic drive device, characterized in that The electromagnetic drive device is provided with a cavity, and comprises a shell, a magnetic conducting core, the shell at least comprises a magnetic conducting part, the magnetic conducting part comprises a top wall part and a side wall part, the top wall part is fixedly connected with the magnetic conducting core, the outer periphery of the magnetic conducting core is provided with a moving coil assembly, the moving coil assembly can reciprocate along the axial direction of the magnetic conducting core, the electromagnetic drive device further comprises at least one permanent magnet and a first magnetic conducting body, the permanent magnet and the first magnetic conducting body are located in the cavity, the top wall part is not in direct contact with the first magnetic conducting body, the permanent magnet is substantially arc-shaped structure, the permanent magnet is provided with an inner wall surface and an outer wall surface, further comprises an outer side magnetic pole part and an inner side magnetic pole part, the outer side magnetic pole part is relatively close to the outer wall surface, the inner side magnetic pole part is relatively close to the inner wall surface, the outer side magnetic pole part is directly or indirectly attached to at least part of the side wall part, and the inner side magnetic pole part is attached to the first magnetic conducting body; two permanent magnets are provided, including a first permanent magnet and a second permanent magnet, the electromagnetic drive device further comprises a second magnetic conducting body, the second magnetic conducting body comprises an outer periphery part and an inner periphery part, the permanent magnet is located between the second magnetic conducting body and the first magnetic conducting body, the outer periphery part is attached to at least part of the side wall part, and at least part of the inner periphery part is attached to the permanent magnet.

2. The electromagnetic drive device according to claim 1, characterized by Two permanent magnets are provided, including a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet are located between the side wall part and the first magnetic conducting body, the first permanent magnet is provided with a first outer wall surface and a second inner wall surface, further comprises a first outer side magnetic pole part and a second inner side magnetic pole part, the first outer side magnetic pole part is relatively close to the first outer wall surface, the second inner side magnetic pole part is relatively close to the second inner wall surface, the second permanent magnet is provided with a third outer wall surface and a fourth inner wall surface, further comprises a third outer side magnetic pole part and a fourth inner side magnetic pole part, the third outer side magnetic pole part is relatively close to the third outer wall surface, and the fourth inner side magnetic pole part is relatively close to the fourth inner wall surface.

3. The electromagnetic drive device according to claim 2, characterized by The first outer side magnetic pole part and the third outer side magnetic pole part are attached to at least part of the side wall part, and the second inner side magnetic pole part and the fourth inner side magnetic pole part are attached to the first magnetic conducting body.

4. The electromagnetic driving device according to claim 1, characterized by The second magnetic conducting body is substantially a hollow ring structure, the first permanent magnet further comprises a first outer side magnetic pole part and a second inner side magnetic pole part, the second permanent magnet further comprises a third outer side magnetic pole part and a fourth inner side magnetic pole part, at least part of the inner periphery part is attached to the first outer side magnetic pole part and the third outer side magnetic pole part, and the second inner side magnetic pole part and the fourth inner side magnetic pole part are attached to the first magnetic conducting body.

5. The electromagnetic driving device according to claim 1, wherein The inner periphery part comprises a first recess, a second recess and a first protruding part and a second protruding part protruding towards the first magnetic conducting body in the direction opposite to the first recess and the second recess.

6. The electromagnetic drive device according to claim 5, characterized by The first permanent magnet comprises a first outer magnetic pole part and a second inner magnetic pole part, the second permanent magnet comprises a third outer magnetic pole part and a fourth inner magnetic pole part, the first protruding part is matched with the first permanent magnet and is in contact with the first outer magnetic pole part, and the second protruding part is matched with the second permanent magnet and is in contact with the third outer magnetic pole part.

7. The electromagnetic drive device according to claim 6, characterized by The first protruding part or the second protruding part is away from the first magnetic conductor by a first distance, and the first recessed part or the second recessed part is away from the first magnetic conductor by a second distance, the second distance being greater than the first distance.

8. The electromagnetic driving device according to claim 4, wherein The first magnetic conductor comprises a body part and a first extension part and a second extension part extending outwardly from the body part, the first extension part is matched with the first permanent magnet and is in contact with the second inner magnetic pole part of the first permanent magnet, and the second extension part is matched with the second permanent magnet and is in contact with the fourth inner magnetic pole part of the second permanent magnet.

9. The electromagnetic drive device according to claim 8, characterized by The inner peripheral part comprises a first recessed part, a second recessed part, and a first protruding part and a second protruding part protruding towards the first magnetic conductor with respect to the first recessed part and the second recessed part, the first recessed part is matched with the first permanent magnet and is in contact with the first outer magnetic pole part, and the second recessed part is matched with the second permanent magnet and is in contact with the third outer magnetic pole part.

10. The electromagnetic drive device according to claim 9, characterized by The first protruding part or the second protruding part is away from the first magnetic conductor by a third distance, and the first recessed part or the second recessed part is away from the first magnetic conductor by a fourth distance, the third distance being greater than the fourth distance (L4).

11. The electromagnetic driving device according to claim 1 or 2, characterized by The first permanent magnet and the second permanent magnet are symmetrically arranged with the center axis of the moving coil assembly as a boundary.

12. The electromagnetic drive device according to claim 1, characterized by A fifth distance is formed between the top wall part and the first magnetic conductor, the first magnetic conductor has a magnetic conductive boss, and a sixth distance is formed between the magnetic conductive boss and the side wall of the magnetic core, the sixth distance being smaller than the fifth distance.

13. The electromagnetic drive device according to claim 1, characterized by The electromagnetic drive device comprises a terminal sheath assembly, the terminal sheath assembly is integrally injection molded, and comprises a sheath assembly and a terminal part, the shell is provided with an opening part, the opening part is arranged on the side wall part, and the opening part is matched with the terminal sheath assembly.

14. The electromagnetic drive device according to claim 13, characterized by The sheath assembly comprises a first sheath and a second sheath, a fifth distance is formed between the top wall part and the first magnetic conductor, the first sheath is located at the fifth distance, the first sheath is in contact with the top wall part and the upper end part of the first magnetic conductor and the permanent magnet, and the second sheath is in contact with the lower end part of the first magnetic conductor and the permanent magnet.

15. The electromagnetic drive device of claim 14, wherein The electromagnetic drive device further comprises a cover plate, the shell is fixedly connected with the cover plate, the cover plate comprises a flat plate part and a protruding part, and the protruding part is in pressure contact with the second sheath.

16. A gas proportional valve characterized by The utility model discloses a gas proportional valve, including main valve seat, the main valve seat is equipped with import and export, gas enters from the import and flows from the export, the first electromagnetic drive component, second electromagnetic drive component and electromagnetic drive device are fixedly connected with the main valve seat, the inner chamber of main valve seat is equipped with pressure difference adjusting device still, the main valve seat is equipped with the first valve mouth with first electromagnetic drive component corresponds, the second valve mouth with second electromagnetic drive component corresponds, the third valve mouth with electromagnetic drive device corresponds and the main valve mouth with pressure difference adjusting device corresponds, first electromagnetic drive component and second electromagnetic drive component main gas proportional valve's safety switch function, electromagnetic drive device and pressure difference adjusting device mainly gas flow regulation function, electromagnetic drive device is the electromagnetic drive device of any one of claims 1-15.

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