CN218548119U

CN218548119U - Proportional electromagnet

Info

Publication number: CN218548119U
Application number: CN202222701230.3U
Authority: CN
Inventors: 吴会刚; 谢嘉玮; 张昊; 徐龙; 万新成
Original assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Current assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2023-02-28
Anticipated expiration: 2032-10-13

Abstract

The embodiment of the utility model provides a proportion electro-magnet, the proportion electro-magnet includes coil, armature, connecting rod and circuit board, armature can follow the first direction removal for the coil under the drive of coil, the connecting rod links to each other with armature, so that the connecting rod can follow the first direction removal for the coil under the drive of armature, the first end of connecting rod has the electromagnet, the position of circuit board is fixed for the coil, circuit board and electromagnet interval setting in the second direction, second direction and first direction quadrature, the circuit board has two at least hall element and connects two at least hall element's signal conditioning circuit, two at least hall element are arranged along the first direction interval. The utility model discloses the proportion electro-magnet has higher precision through the circuit board that has two at least hall element and signal conditioning circuit and the displacement data of connecting rod cooperation in order to acquire armature that has the electromagnet.

Description

Proportional electromagnet

Technical Field

The utility model relates to an electro-magnet technical field, concretely relates to proportion electro-magnet.

Background

The proportional electromagnet is an electro-mechanical conversion device of an electro-hydraulic proportional control element. The proportional electromagnet drives the armature to move through the coil, and the armature drives the push rod to move so as to realize a driving function. In the related art, in order to obtain and control the driving displacement of the proportional electromagnet, a displacement sensor is arranged to be connected with an armature or a push rod. However, in the related art, the displacement data acquired by the displacement sensor has a large error and low accuracy.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving one of the technical problems in the related art at least to a certain extent. For this reason, the embodiment of the utility model provides a proportion electro-magnet, this proportion electro-magnet has higher precision through the circuit board that has two at least hall elements and signal conditioning circuit and the connecting rod cooperation that has the electromagnet in order to acquire the displacement data of armature.

The utility model discloses proportion electro-magnet includes:

a coil;

an armature movable in a first direction relative to the coil under drive of the coil;

a connecting rod connected to the armature such that the connecting rod is movable in a first direction relative to the coil under the drive of the armature, the connecting rod having an electromagnet at a first end;

the circuit board is fixed relative to the coil, the circuit board and the electromagnet are arranged at intervals in a second direction, the second direction is orthogonal to the first direction, the circuit board is provided with at least two Hall elements and a signal conditioning circuit connected with the at least two Hall elements, and the at least two Hall elements are arranged at intervals in the first direction.

The utility model discloses the proportion electro-magnet sets up connecting rod and armature synchronous motion to set up the electromagnet on the connecting rod, the circuit board response electromagnet's through having two at least hall element and signal conditioning circuit position is in order to acquire the displacement data of armature, because have two at least hall element on the circuit board, consequently the displacement data of the armature that acquires have higher precision.

In some embodiments, the proportional electromagnet further comprises:

the armature, the connecting rod and the circuit board are arranged in an inner cavity of the shell, the coil is arranged on the shell, and the coil is arranged around the armature;

the first end of the push rod is located in the inner cavity of the shell and connected with the armature, the second end of the push rod extends out of the shell, and the push rod can move along a first direction relative to the shell under the driving of the armature.

In some embodiments, the housing comprises:

the coil is arranged on the first shell, the armature is arranged in an inner cavity of the first shell, a first end of the push rod is positioned in the inner cavity of the first shell, and a second end of the push rod extends out of the first shell;

the second casing, the second casing with first casing can dismantle the connection, the circuit board with the first end of connecting rod is located in the inner chamber of second casing, the second end of connecting rod is followed the inner chamber of second casing extends to in the inner chamber of first casing and with armature links to each other.

In some embodiments, the first housing comprises:

the armature is arranged in an inner cavity of the first shell, an installation groove for embedding the coil is formed in the inner circumferential surface of the first shell, and the first shell is provided with a through hole for the connecting rod to pass through;

the first end cover is connected with the first end of the first shell, at least part of the first end cover is embedded into the inner cavity of the first shell and abutted against the coil, and the push rod penetrates through the first end cover and extends into the inner cavity of the first shell.

In some embodiments, the second housing comprises:

the circuit board is arranged in an inner cavity of the second shell;

the inner shell is arranged in the inner cavity of the second outer shell, the circuit board is arranged on the outer wall surface of the inner shell, and the inner shell is provided with a first cavity extending along the first direction;

the second end cover is connected with the first end of the second outer shell, part of the second end cover is embedded into the inner cavity of the second outer shell and abutted against the inner shell, the second end cover is provided with a second cavity penetrating through the second end cover along the first direction, the second cavity is communicated with the first cavity, the first end of the connecting rod can move along the first direction in the second cavity and the first cavity, and the second end of the connecting rod extends out of the second end cover.

In some embodiments, the second end of the second end cap is provided with an external thread, the first housing has a coupling groove receiving the second end of the second end cap, and an inner circumferential surface of the coupling groove has an internal thread fitted with the external thread.

In some embodiments, the first end of the connecting rod is provided with a protrusion on its outer circumferential surface;

the second housing further includes a head connected to the second end cap and positioned within the second chamber, the head being capable of stopping against the protrusion.

In some embodiments, the second housing further comprises a third end cap connected to the second end of the second outer shell, and a portion of the third end cap is embedded in the inner cavity of the second outer shell and abuts the inner shell.

In some embodiments, the proportional electromagnet further includes an elastic member extending in the first direction and disposed in the inner cavity of the housing, the elastic member being coupled to the connecting rod to drive the connecting rod to move in a direction toward the armature.

In some embodiments, the circuit board has a temperature sensing element for measuring the temperature in the interior cavity of the housing.

Drawings

Fig. 1 is a schematic structural diagram of a proportional electromagnet according to an embodiment of the present invention.

Reference numerals are as follows:

1. a coil; 2. an armature; 3. a connecting rod; 31. an electromagnet; 4. a circuit board; 41. a Hall element; 5. a housing; 51. a first housing; 511. a first housing; 512. a first end cap; 513. a sleeve; 52. a second housing; 521. a second housing; 522. an inner shell; 523. a second end cap; 524. a tip; 525. a third end cap; 6. a push rod; 7. an elastic member.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

A proportional electromagnet according to an embodiment of the present invention is described below with reference to fig. 1.

As shown in fig. 1, the proportional electromagnet according to the embodiment of the present invention includes a coil 1, an armature 2, a connecting rod 3, and a circuit board 4.

The armature 2 is movable in a first direction (left-right direction as viewed in fig. 1) relative to the coil 1 under the drive of the coil 1. Specifically, as shown in fig. 1, the armature 2 is a rod body extending in the left-right direction, the coil 1 is disposed around the extending direction of the armature 2, and the coil 1 can generate a magnetic field to apply a force to the armature 2, thereby moving the armature 2 in the left-right direction.

The connecting rod 3 is connected to the armature 2 such that the connecting rod 3 is movable in a first direction relative to the coil 1 under the drive of the armature 2, the first end of the connecting rod 3 having an electromagnet 31. Specifically, as shown in fig. 1, the connecting rod 3 extends in the left-right direction, the left end of the connecting rod 3 is connected to the armature 2, so that the connecting rod 3 can move synchronously with the armature 2 under the driving of the armature 2, and the electromagnet 31 is embedded in the right end of the connecting rod 3.

The position of the circuit board 4 is fixed relative to the coil 1, the circuit board 4 and the electromagnet 31 are arranged at intervals in a second direction (the up-down direction shown in fig. 1) orthogonal to the first direction, the circuit board 4 has at least two hall elements 41 and a signal conditioning circuit connected with the at least two hall elements 41, and the at least two hall elements 41 are arranged at intervals in the first direction.

Specifically, as shown in fig. 1, the circuit board 4 is fixed in position relative to the coil 1, the circuit board 4 is disposed above the electromagnet 31 and spaced from the electromagnet 31 and the connecting rod 3 in the up-down direction, two hall elements 41 are disposed on the circuit board 4 and spaced in the left-right direction, the two hall elements 41 are disposed on the lower end surface of the circuit board 4 facing the electromagnet 31, and a signal conditioning circuit connected to the two hall elements 41 is further disposed on the circuit board 4, so that the two hall elements 41 induce the magnetic field change of the permanent magnet 21 at different positions to obtain the displacement data of the armature 2.

In some embodiments, the proportional electromagnet of the present invention further includes a housing 5 and a push rod 6. The armature 2, the connecting rod 3 and the circuit board 4 are arranged in an inner cavity of the shell 5, the coil 1 is arranged on the shell 5, and the coil 1 is arranged around the armature 2. A first end of the push rod 6 is located in an inner cavity of the housing 5 and connected to the armature 2, a second end of the push rod 6 extends out of the housing 5, and the push rod 6 is movable in a first direction relative to the housing 5 under the drive of the armature 2.

As shown in fig. 1, the housing 5 extends in the left-right direction and has an inner cavity extending in the left-right direction, the armature 2, the tie bar 3, and the circuit board 4 are all provided in the inner cavity of the housing 5, and the coil 1 is provided on the housing 5. The push rod 6 extends along the left-right direction, the right end of the push rod 6 is positioned in the inner cavity of the shell 5 and is connected with the left end of the armature 2, so that the push rod 6 can move synchronously with the armature 2 under the driving of the armature 2, and the left end of the push rod 6 extends out of the shell 5 from the left end of the shell 5 to the left, so that a part connected with the push rod 6 is driven to move through the push rod 6.

In some embodiments, the housing 5 includes a first housing 51 and a second housing 52. The coil 1 is disposed on the first housing 51, the armature 2 is disposed in the inner cavity of the first housing 51, the first end of the push rod 6 is located in the inner cavity of the first housing 51, and the second end of the push rod 6 extends out of the first housing 51. The second housing 52 is detachably connected to the first housing 51, the circuit board 4 and the first end of the connection rod 3 are located in the inner cavity of the second housing 52, and the second end of the connection rod 3 extends from the inner cavity of the second housing 52 into the inner cavity of the first housing 51 and is connected to the armature 2.

As shown in fig. 1, the housing 5 includes a first housing 51 at a left end and a second housing 52 at a right end, the first housing 51 and the second housing 52 are detachably connected, the first housing 51 and the second housing 52 both extend in the left-right direction, and the first housing 51 and the second housing 52 have inner cavities extending in the left-right direction, respectively, the inner cavity of the first housing 51 communicates with the inner cavity of the second housing 52, the coil 1 is provided on the first housing 51, the armature 2 is provided in the inner cavity of the first housing 51, the right end of the push rod 6 is provided in the inner cavity of the first housing 51, the left end of the push rod 6 protrudes from the inner cavity of the first housing 51, the circuit board 4 and the right end of the connecting rod 3 are provided in the inner cavity of the second housing 52, and the circuit board 4 and the right end of the connecting rod 3 are arranged at intervals in the up-down direction, the left end of the connecting rod 3 protrudes from the left end of the second housing 52 and protrudes from the right end of the first housing 51 into the inner cavity of the first housing 51, and the left end of the connecting rod 3 is connected to the right end of the armature 2.

The first shell provided with the coil and the armature is equivalent to the body of the electromagnet, the second shell provided with the circuit board and the connecting rod forms the Hall sensor, the first shell and the second shell are detachably connected to enable the body of the electromagnet and the Hall sensor to be separable, and when one of the body of the electromagnet and the Hall sensor is damaged, the body of the electromagnet and the Hall sensor can be replaced conveniently.

It will be appreciated that in other embodiments, the first and second housings may be of unitary construction.

In some embodiments, the first housing 51 includes a first shell 511 and a first end cap 512. The armature 2 is disposed in an inner cavity of the first housing 511, an inner peripheral surface of the first housing 511 is provided with a mounting groove for embedding the coil 1, and the first housing 511 has a through hole for passing the connection rod 3. The first end cap 512 is connected to the first end of the first housing 511, at least a portion of the first end cap 512 is embedded in the inner cavity of the first housing 511 and abuts against the coil 1, and the push rod 6 penetrates the first end cap 512 and extends into the inner cavity of the first housing 511.

As shown in fig. 1, the first housing 51 includes a first end cap 512 at a left end and a first housing 511 at a right end, an inner cavity extending in a left-right direction is provided in the first housing 511, the inner cavity of the first housing 511 forms an opening at the left end of the first housing 511, the first end cap 512 is used for closing the opening, the armature 2 is provided in the inner cavity of the first housing 511, an installation groove for inserting the coil 1 is provided on an inner peripheral surface of the first housing 511 to install the coil 1 on the first housing 511 through the installation groove, a through hole for passing the connection rod 3 is provided at the right end of the first housing 511, the through hole is communicated with the inner cavity of the first housing 511 to pass the connection rod 3 through the through hole to enter the inner cavity of the first housing 511 to connect the armature 2, the first end cap 512 is connected with the first housing 511 in a snap fit manner, the first end cap 512 is inserted into the inner cavity of the first housing 511, the right end surface of the first end cap 512 is connected with the coil 1 to enable the first housing 511 to define a position of the coil 1 in the left-right direction, a groove is provided on the right end surface of the first end cap 512, the first housing 512 is communicated with the inner cavity of the armature 2 to move in the left-right direction, and the armature 511, and the left-right direction, and the armature 2 can move in the left-right direction, and the armature 2.

The installation groove is arranged to accommodate the coil, and the position of the coil is limited by the first end cover, so that the coil can be fixed without injection molding or pouring.

It will be appreciated that in other embodiments, the first housing and the first end cap may be threadably attached, and only the right end of the first end cap may be embedded within the interior cavity of the first housing.

In some embodiments, as shown in fig. 1, the first housing 51 further includes a sleeve 513, the sleeve 513 is located in the inner cavity of the first outer shell 511, the armature 2 is located in the inner cavity of the sleeve 513, and an outer peripheral surface of the armature 2 abuts against an inner peripheral surface of the sleeve 513, an outer peripheral surface of a right end of the sleeve 513 abuts against an inner peripheral surface of the first outer shell 511, and an outer peripheral surface of a left end of the sleeve 513 abuts against an inner peripheral surface of the coil 1, so that the coil 1 is defined in the mounting groove by the sleeve 513.

In some embodiments, the second housing 52 includes a second outer shell 521, an inner shell 522, and a second end cap 523. The circuit board 4 is disposed in the inner cavity of the second housing 521. The inner case 522 is disposed in the inner cavity of the second outer case 521, and the circuit board 4 is disposed on an outer wall surface of the inner case 522, the inner case 522 having a first chamber extending in a first direction. The second end cap 523 is connected to the first end of the second outer case 521, a part of the second end cap 523 is embedded in the inner cavity of the second outer case 521 and abuts against the inner case 522, the second end cap 523 has a second chamber penetrating through the second end cap 523 in the first direction, the second chamber is communicated with the first chamber, the first end of the connecting rod 3 is movable in the first direction in the second chamber and the first chamber, and the second end of the connecting rod 3 extends out of the second end cap 523.

As shown in fig. 1, the second housing 52 includes a second outer housing 521, an inner housing 522 and a second end cap 523, wherein the second outer housing 521 is a shielding housing, the inner housing 522 is disposed in an inner cavity of the second outer housing 521, a left end surface of the inner housing 522 is provided with a first cavity extending rightward, an outer wall surface of the inner housing 522 is provided with a receiving cavity, the circuit board 4 is disposed in the receiving cavity and connected to the outer wall surface of the inner housing 522 by screws, the second end cap 523 is disposed at a left end of the second outer housing 521, a right end of the second end cap 523 is embedded in the inner cavity of the second outer housing 521 and abutted against the left end surface of the inner housing 522, the second end cap 523 is provided with a second cavity penetrating through the second end cap 523 in a left-right direction, an inner diameter of the first cavity is the same as an inner diameter of the second cavity, when the second outer housing 521 is connected to the second end cap 523, the first cavity and the second cavity are communicated to receive a right end of the connecting rod 3 movable in the left-right direction, and a left end of the connecting rod 3 protrudes from a left end surface of the second end cap 523.

The second shell links to each other so that the split with the second end cover block, and second end cover butt inner shell can play limiting displacement to the inner shell simultaneously, sets up the inner shell and is used for being convenient for installation circuit board.

It will be appreciated that in other embodiments, the second outer shell and the second end cap may be threaded, and the second outer shell and the inner shell may be of a unitary construction.

In some embodiments, the second end of the second end cap 523 is provided with an external thread, and the first housing 511 has a coupling groove receiving the second end of the second end cap 523, an inner circumferential surface of the coupling groove having an internal thread fitted with the external thread.

As shown in fig. 1, a right end surface of the first housing 511 is provided with a connection groove, an inner circumferential surface of the connection groove has an internal thread, and a left end of the second end cap 523 is provided with an external thread and is located in the connection groove to connect the second end cap 523 and the first housing 511 through the matching of the internal thread and the external thread, thereby realizing detachable connection of the second end cap 523 and the first housing 511.

In some embodiments, the first end of the connecting rod 3 is provided with a protrusion on its outer circumference. The second housing 52 further includes a tip 524, the tip 524 being connected to the second end cap 523 and located in the second chamber, the tip 524 being capable of stopping against the protrusion.

As shown in fig. 1, the outer peripheral surface of the right end of the connecting rod 3 is provided with a protrusion, preferably, the protrusion is in a ring shape surrounding the outer peripheral surface of the connecting rod 3, the end 524 is located in the second cavity of the second end cap 523, and the end 524 is used for stopping the protrusion, so that the right end of the connecting rod 3 moves in the space formed by the first cavity and the second cavity, and does not separate from the second housing 52, thereby ensuring that the hall element 41 can sense the electromagnet 31.

In some embodiments, head 524 and second endcap 523 are coupled by a slotted connection, preferably a slotted screw, and slotted connection 4 is removably coupled between head 524 and second endcap 523 to define the relative positions of head 524 and second endcap 523.

The connecting piece plays limiting displacement to the end on the horse, can avoid the end to compare in second end cover production along the drunkenness of left right direction and around the rotation of left right direction, and then can make the end inject the moving distance of connecting rod on left right direction to can avoid the connecting rod to rotate around left right direction, in order to guarantee the precision that the position circuit board acquireed data.

In some embodiments, the surface of the circuit board 4 has a potting adhesive layer.

The surface of the circuit board is provided with the potting adhesive layer, so that the pollution of a signal conditioning circuit on the circuit board can be greatly reduced, and the waterproof and moistureproof performances are high. Meanwhile, adverse reactions caused by vibration impact in the using process can be eliminated, and the accuracy of the circuit board for acquiring data cannot be influenced even if slight collision occurs.

In some embodiments, the second housing 52 further comprises a third end cap 525, the third end cap 525 is connected to the second end of the second outer shell 521, and a portion of the third end cap 525 is embedded in the inner cavity of the second outer shell 521 and abuts the inner shell 522.

As shown in fig. 1, the third end cap 525 is disposed at the right end of the second outer housing 521, and the left end of the third end cap 525 is embedded in the inner cavity of the second outer housing 521 and abuts against the right end surface of the inner housing 522, so that the inner housing 522 is fixed in the second outer housing 521 by the second end cap 523 and the third end cap 525, and the inner housing 522 is prevented from moving in the left-right direction with respect to the second outer housing 521. Meanwhile, the second end cover 523 and the third end cover 525 are respectively connected with the second casing 521 in a clamping manner, so that the second casing is convenient to detach and replace.

In some embodiments, the proportional electromagnet of the present invention further includes an elastic member 7, the elastic member 7 extends along the first direction and is disposed in the inner cavity of the housing 5, and the elastic member 7 is connected to the connecting rod 3 to drive the connecting rod 3 to move along the direction toward the armature 2.

As shown in fig. 1, the elastic member 7 extends in the left-right direction and is disposed in the first chamber, the right end of the elastic member 7 abuts against the inner housing 522, the left end of the elastic member 7 is sleeved on the connecting rod 3 and abuts against the right end face of the protrusion, and the elastic member 7 is configured to drive the connecting rod 3 to move leftward, so that when the coil 1 drives the armature 2 to move leftward, the connecting rod 3 always abuts against the armature 2 leftward by the elastic force of the elastic member 7, thereby enabling the connecting rod 3 and the armature 2 to move synchronously all the time.

In some embodiments, the circuit board 4 has a temperature sensing element for measuring the temperature in the interior cavity of the housing 5.

In the process of sensing the displacement of the electromagnet 31 to obtain the displacement data of the armature, the circuit board 4 may have an error in the obtained data due to the temperature change in the inner cavity of the housing 5, so that the temperature measuring element is arranged to measure the temperature in the inner cavity of the housing 5, and the temperature obtained by the temperature measuring element can perform error compensation in the process of calculating the displacement data of the armature, so as to eliminate the data error due to the temperature change, as shown in fig. 1, in order to ensure the accuracy of the temperature obtaining by the temperature measuring element, oil is provided in the inner cavity of the housing 5, and in order to communicate the oil in the first housing 51 and the second housing 52 and not generate a pressure difference, an oil passage penetrating through the armature 2 in the left-right direction is provided on the armature 2.

Of course, in other embodiments, the interior of the measuring housing 5 may also be provided without oil, but with air only.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used only for component differentiation, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although the above embodiments have been shown and described, it should be understood that they are exemplary and should not be construed as limiting the present invention, and that many changes, modifications, substitutions and alterations to the above embodiments by those of ordinary skill in the art are intended to be within the scope of the present invention.

Claims

1. A proportional electromagnet, comprising:

a coil (1);

an armature (2), the armature (2) being movable in a first direction relative to the coil (1) under drive of the coil (1);

the connecting rod (3) is connected with the armature (2) so that the connecting rod (3) can move along a first direction relative to the coil (1) under the driving of the armature (2), and a first end of the connecting rod (3) is provided with an electromagnet (31);

the circuit board (4), the position of the circuit board (4) is fixed relative to the coil (1), the circuit board (4) and the electromagnet (31) are arranged at intervals in a second direction, the second direction is orthogonal to the first direction, the circuit board (4) is provided with at least two Hall elements (41) and a signal conditioning circuit connected with the at least two Hall elements (41), and the at least two Hall elements (41) are arranged at intervals along the first direction.

2. The proportional electromagnet of claim 1, further comprising:

the armature (2), the connecting rod (3) and the circuit board (4) are arranged in an inner cavity of the shell (5), the coil (1) is arranged on the shell (5), and the coil (1) is arranged around the armature (2);

the first end of the push rod (6) is located in the inner cavity of the shell (5) and connected with the armature (2), the second end of the push rod (6) extends out of the shell (5), and the push rod (6) can move along the first direction relative to the shell (5) under the driving of the armature (2).

3. Proportional electromagnet according to claim 2, characterized in that the housing (5) comprises:

the coil (1) is arranged on the first shell (51), the armature (2) is arranged in an inner cavity of the first shell (51), a first end of the push rod (6) is positioned in the inner cavity of the first shell (51), and a second end of the push rod (6) extends out of the first shell (51);

the second shell (52), the second shell (52) and the first shell (51) are detachably connected, the circuit board (4) and the first end of the connecting rod (3) are located in the inner cavity of the second shell (52), and the second end of the connecting rod (3) extends from the inner cavity of the second shell (52) to the inner cavity of the first shell (51) and is connected with the armature (2).

4. Proportional electromagnet according to claim 3, characterized in that the first housing (51) comprises:

the armature (2) is arranged in an inner cavity of the first shell (511), an installation groove for embedding the coil (1) is formed in the inner circumferential surface of the first shell (511), and the first shell (511) is provided with a through hole for allowing the connecting rod (3) to pass through;

a first end cap (512), the first end cap (512) is connected with the first end of the first housing (511), at least part of the first end cap (512) is embedded in the inner cavity of the first housing (511) and is abutted against the coil (1), and the push rod (6) penetrates through the first end cap (512) and extends into the inner cavity of the first housing (511).

5. Proportional electromagnet according to claim 4, characterized in that the second housing (52) comprises:

a second housing (521), the circuit board (4) being disposed in an inner cavity of the second housing (521);

an inner housing (522), wherein the inner housing (522) is arranged in the inner cavity of the second outer housing (521), the circuit board (4) is arranged on the outer wall surface of the inner housing (522), and the inner housing (522) is provided with a first cavity extending along the first direction;

a second end cap (523), the second end cap (523) is connected to the first end of the second outer shell (521), a part of the second end cap (523) is embedded in the inner cavity of the second outer shell (521) and abuts against the inner shell (522), the second end cap (523) has a second chamber penetrating through the second end cap (523) along the first direction, the second chamber is communicated with the first chamber, the first end of the connecting rod (3) is movable along the first direction in the second chamber and the first chamber, and the second end of the connecting rod (3) extends out of the second end cap (523).

6. Proportional electromagnet according to claim 5, characterized in that the second end of the second end cover (523) is provided with an external thread, the first housing (511) having a connection slot receiving the second end of the second end cover (523), the inner circumferential surface of the connection slot having an internal thread adapted to the external thread.

7. Proportional electromagnet according to claim 5, characterised in that the first end of the connecting rod (3) is provided on its outer circumference with a projection;

the second shell (52) further comprises a head (524), the head (524) is connected with the second end cover (523) and is located in the second cavity, and the head (524) can stop against the bulge.

8. The proportional electromagnet according to claim 5, wherein the second housing (52) further comprises a third end cap (525), the third end cap (525) being connected to the second end of the second outer housing (521), and a portion of the third end cap (525) being embedded in the inner cavity of the second outer housing (521) and abutting the inner housing (522).

9. Proportional electromagnet according to any one of claims 2-8, characterised in that it further comprises an elastic member (7), said elastic member (7) extending in said first direction and being arranged in an inner cavity of said housing (5), said elastic member (7) being connected to said connecting rod (3) for driving said connecting rod (3) in a direction towards said armature (2).

10. Proportional electromagnet according to claim 2, characterised in that the circuit board (4) has a temperature measuring element for measuring the temperature in the inner cavity of the housing (5).