JP2020198361A - Electromagnetic solenoid device - Google Patents

Abstract

To provide an electromagnetic solenoid device that can prevent variations in thrust acting on a movable iron core and can also reduce costs.SOLUTION: In an electromagnetic solenoid device 4, a collar 46 is integrally formed on a first end plate portion 431 by drawing. Further, a frame 43 is composed of one component in which first and second both end plate portions 431 and 432 are bent at both ends of a connecting plate portion 433. Further, a recess 422 capable of accommodating the collar 46 is formed in a flange portion 421 at one end of a bobbin 42 such that the bobbin 42 can be slid from the side to the frame 43 and assembled.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electromagnetic solenoid used in an electromagnetic proportional valve or the like.

Conventionally, as this type of electromagnetic solenoid device, an electromagnetic coil, a tubular bobbin around which the electromagnetic coil is wound, a first end plate portion facing one end in the axial direction of the bobbin, and the other end in the axial direction of the bobbin are opposed to each other. A frame made of a magnetic material having a second end plate portion and a connecting plate portion connecting the first and second both end plates, and a non-magnetic material inserted into the bobbin and having one end closed in the axial direction. Made of magnetic material that is inserted from the axial end side into the gap between the guide pipe, the movable iron core that is slidably inserted into the guide pipe from the open end at the other end in the axial direction, and the guide pipe on the inner circumference of the bobbin. Generated by energizing the electromagnetic coil so that it passes through a magnetic path that returns from the first end plate to the first end plate via the collar, movable iron core, second end plate, and connecting plate. It is known that a bobbin is made to act on the movable iron core toward the other end side in the axial direction (see, for example, Patent Document 1).

Here, in the above-mentioned conventional example, the first end plate portion of the frame and the collar are separate bodies. Therefore, the number of parts increases, which is a factor of cost increase. Further, due to the variation in the contact state between the first end plate and the collar, even if the energizing current value to the electromagnetic coil is the same, the collar, the movable iron core, the second end plate, and the connecting plate are connected from the first end plate. The strength of the magnetic field line passing through the magnetic path returning to the first end plate portion via the above, that is, the thrust acting on the movable iron core varies.

JP-A-2017-89747

In view of the above points, it is an object of the present invention to provide an electromagnetic solenoid device capable of preventing the variation of the thrust acting on the movable iron core and reducing the cost.

In order to solve the above problems, the present invention presents an electromagnetic coil, a tubular bobbin around which the electromagnetic coil is wound, a first end plate portion facing one end in the axial direction of the bobbin, and the other end in the axial direction of the bobbin. A frame made of a magnetic material having a second end plate portion facing the bobbin and a connecting plate portion connecting the first and second both end plate portions, and a non-magnetic material inserted into the bobbin and having one end closed in the axial direction. Magnetism that is inserted from one end side in the axial direction into the gap between the guide pipe made of the product, the movable iron core that is slidably inserted into the guide pipe from the open end at the other end in the axial direction, and the guide pipe on the inner circumference of the bobbin. It is equipped with a collar made of material, and energizes the electromagnetic coil so that it passes through a magnetic path that returns from the first end plate to the first end plate via the collar, movable iron core, second end plate, and connecting plate. In an electromagnetic solenoid device in which a thrust force acts on the movable iron core toward the other end side in the axial direction by the magnetic field lines generated in the above, the first end plate portion is characterized in that a collar is integrally formed by drawing. ..

According to the present invention, since the collar is integrally formed on the first end plate portion of the frame, the strength of the magnetic field line passing through the magnetic path causes the contact between the first end plate portion and the collar as in the conventional example. It is possible to prevent the variation of the thrust acting on the movable iron core without causing the variation due to the variation of the condition. Further, since the first end plate portion and the collar are integrated, the number of parts can be reduced and the cost can be reduced.

Further, in the present invention, the connecting plate portion is provided so as to be located at only one location in the circumferential direction around the bobbin, and the frame has the first end plate portion and the second end at one end and the other end of the connecting plate portion. The plate part is formed in a curved side view U-shape, and the collar can be stored in the flange part at one end in the axial direction of the bobbin, which reaches from the center part of the flange part to the outer peripheral surface of one place in the circumferential direction of the flange part. It is desirable that recesses of various depth and width are formed. According to this, the frame is composed of one component, and the number of components can be reduced as much as possible in combination with the integration of the first end plate portion and the collar, and further, the first frame The frame and bobbin can be assembled by simply sliding the bobbin from the opposite side of the connecting plate and inserting it in a state where the collar is aligned so that it is stored in the recess between the two end plates. As a result, the assemblability is improved and the cost can be significantly reduced.

FIG. 5 is a cut side view of an example of an electromagnetic proportional valve including the electromagnetic solenoid device according to the embodiment of the present invention. The perspective view of the disassembled state of the main part of the electromagnetic solenoid device of an embodiment.

The electromagnetic proportional valve shown in FIG. 1 is interposed in the gas supply path to the burner, and has a primary pressure chamber 11, a secondary pressure chamber 12 located below the primary pressure chamber 11, and a primary pressure chamber 11. A casing 1 having a valve seat 13 between the gas and the secondary pressure chamber 12 is provided. The primary pressure chamber 11 communicates with the upstream portion of the gas supply path through an inlet 11a formed at one place around it, and the secondary pressure chamber 12 supplies gas through an outlet 12a formed at one place around it. It communicates with the downstream part of the road. Further, the valve seat 13 is formed with a valve hole 13a that communicates the primary compression chamber 11 and the secondary compression chamber 12. The lower surface of the secondary compression chamber 12 is closed by a lid plate 14 attached to the casing 1.

Further, the electromagnetic proportional valve has a diaphragm 2 that covers the upper surface of the primary pressure chamber 11, a valve body 3 connected to the diaphragm 2, and a downward pressing force that is an opening side of the valve body 3. It includes an electromagnetic solenoid device 4.

The outer peripheral portion of the diaphragm 2 is clamped and fixed to the outer peripheral portion of the upper surface of the primary compression chamber 11 by a resin diaphragm cover 21 which is fastened to the upper surface of the casing 1 so as to cover the diaphragm 2. A back pressure chamber 22 that is open to the atmosphere is defined between the diaphragm 2 and the diaphragm cover 21. Further, on the upper surface of the diaphragm 2, a tubular valve body holder 23 having a flange portion 23a at the lower end in contact with the upper surface is provided.

The valve body 3 has an umbrella-shaped main body 31 that is inserted into the valve hole 13a and whose outer diameter is gradually increased downward, and a shaft portion 32 that extends from the main body 31 and is connected to the diaphragm 2. There is. A small diameter shaft portion 32a protruding upward from the shoulder surface in contact with the lower surface of the diaphragm 2 is provided at the upper end portion of the shaft portion 32. Then, the valve body 3 is connected to the diaphragm 2 by fitting and fixing the small diameter shaft portion 32a to the valve body holder 23 through a hole formed in the center of the diaphragm 2. Further, the valve body 2 is urged upward on the closing side by a spring 33 interposed between the valve body 2 and the lid plate 14.

The electromagnetic solenoid device 4 includes an electromagnetic coil 41, a tubular bobbin 42 in which the electromagnetic coil 41 is wound around the outer circumference, and an axial direction of a first end plate portion 431 and the bobbin 42 facing the upper end of the bobbin 42 at one end in the axial direction. A frame 43 made of a magnetic material having a second end plate portion 432 facing the lower end, which is the other end, and a connecting plate portion 433 connecting the first and second both end plate portions 431 and 432, and a bobbin 42 are inserted. A guide pipe 44 made of a non-magnetic material in which the upper end at one end in the axial direction is closed, a movable iron core 45 that is slidably inserted into the guide pipe 44 from the open end at the lower end at the other end in the axial direction, and a bobbin 42. A collar 46 made of a magnetic material, which is inserted from the upper end side at one end in the axial direction, is provided in a gap between the peripheral guide pipe 44 and the bobbin 44. Then, a magnetic path is formed from the first end plate portion 431 to return to the first end plate portion 431 via the collar 46, the movable iron core 45, the second end plate portion 432, and the connecting plate portion 433, and the electromagnetic coil 41 is energized. The magnetic field lines generated so as to pass through the magnetic path cause a thrust acting on the movable iron core 45 on the other end side in the axial direction, that is, downward.

The frame 43 is fastened to the upper surface of the diaphragm cover 21 at the second end plate portion 432, and the lower end of the movable iron core 45 abuts on the upper end of the small diameter shaft portion 32a of the valve body 3. Therefore, a downward pressing force corresponding to the energizing current value of the electromagnetic coil 41 acts on the valve body 3 via the movable iron core 45, and the gas pressure of the secondary pressure chamber 12 is the energizing current value of the electromagnetic coil 41. It changes in proportion to. A spring 47 for urging the movable iron core 45 downward is provided at the upper end of the guide pipe 44. Here, the urging force of the spring 47 and the urging force of the spring 33 that urges the valve body 3 upward are the sum of the own weight of the valve body 3 and the movable iron core 45 and the urging force of the spring 47, and the spring 33 is attached. Set to balance with the forces.

By the way, if the first end plate portion 431 and the collar 46 are separate bodies, the number of parts increases and becomes a factor of cost increase, and the contact condition between the first end plate portion 431 and the collar 46 varies. Even if the energizing current value to the electromagnetic coil 41 is the same, the magnetism that returns from the first end plate portion 431 to the first end plate portion 431 via the collar 46, the movable iron core 45, the second end plate portion 432, and the connecting plate portion 433. The strength of the magnetic field lines passing through the path, that is, the thrust acting on the movable iron core 45 varies, and the proportional characteristic of the gas pressure in the secondary pressure chamber 12 is deviated.

Therefore, in the present embodiment, the collar 46 is integrally formed on the first end plate portion 431 by drawing. According to this, the number of parts can be reduced and the cost can be reduced, and the strength of the magnetic field lines passing through the magnetic path varies with the degree of contact between the first end plate portion 431 and the collar 46 as described above. It is possible to prevent the variation of the thrust acting on the movable iron core 45 and prevent the deviation of the proportional characteristic of the gas pressure of the secondary pressure chamber 12 without causing the variation due to the above.

By the way, one end plate portion of the first end plate portion 431 and the second end plate portion 432 is bent to the corresponding end portion of the connecting plate portion 433, and a bobbin is provided between the first end plate portion 431 and the second end plate portion 432. It is also possible to set the other end plate portion so as to sandwich the 42, and fix the other end plate portion to the connecting plate portion 433 by caulking the corresponding end portion of the connecting plate portion 433. However, in this case, the frame 43 is composed of two parts, and a caulking process is required, which takes time and effort for assembly.

Therefore, in the present embodiment, the connecting plate portion 433 is provided so as to be located only at one location in the circumferential direction around the bobbin 42, and further, the frame 43 is provided at one end of the connecting plate portion 433 and other parts as clearly shown in FIG. The first end plate portion 431 and the second end plate portion 432 are formed in a curved side view U shape at the ends, that is, at the upper end and the lower end. Further, a recess 422 having a depth and width capable of accommodating the collar 46, which reaches the outer peripheral surface of the flange portion 421 from the central portion of the flange portion 421 to the outer peripheral surface of the flange portion 421 at one end in the axial direction of the bobbin 42. Is forming.

According to this, the frame 43 is composed of one component, and the number of components can be reduced as much as possible in combination with the integration of the first end plate portion 431 and the collar 46. Further, the bobbin 42 is positioned between the first and second end plate portions 431 and 432 of the frame 43 so that the collar 46 is housed in the recess 422, and the bobbin 42 is indicated by an arrow from the opposite side of the connecting plate portion 433. The frame 43 and the bobbin 42 can be assembled by simply sliding the frame 43 and inserting the bobbin 42. Therefore, the caulking process is not required, the assembling property is improved, and the number of parts can be reduced, and the cost can be significantly reduced.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, the electromagnetic solenoid device 4 of the above embodiment is for an electromagnetic proportional valve, but the present invention can be similarly applied to an electromagnetic solenoid device for other purposes.

4 ... Electromagnetic solenoid device, 41 ... Electromagnetic coil, 42 ... Bobbin, 421 ... Flange, 422 ... Recess, 43 ... Frame, 431 ... First end plate, 432 ... Second end plate, 433 ... Connecting plate, 44 ... guide pipe, 45 ... movable iron core, 46 ... color.

Claims (2)

An electromagnetic coil, a tubular bobbin around which an electromagnetic coil is wound, a first end plate portion facing one end in the axial direction of the bobbin, a second end plate portion facing the other end in the axial direction of the bobbin, and the first A frame made of a magnetic material having a connecting plate portion connecting the second both end plate portions, a guide pipe made of a non-magnetic material having one end closed in the axial direction inserted in the bobbin, and the guide pipe in the axial direction and the like. The first end plate is provided with a movable iron core that is slidably inserted from the open end of the end and a collar made of magnetic material that is inserted from one end side in the axial direction into the gap between the guide pipe on the inner circumference of the bobbin. The magnetic field generated by energizing the electromagnetic coil so as to pass through the magnetic path from the part to the collar, the movable iron core, the second end plate part, and the connecting plate portion, and then to the first end plate portion. In an electromagnetic solenoid device in which a bobbin is applied to the end side,
An electromagnetic solenoid device characterized in that a collar is integrally formed on the first end plate portion by drawing. The connecting plate portion is provided so as to be located only at one location in the circumferential direction around the bobbin, and the frame has the first end plate portion and the second end plate portion at one end and the other end of the connecting plate portion. It is formed in a curved side view U-shape, and reaches the outer peripheral surface of the flange at one end in the axial direction of the bobbin from the center of the flange to the outer peripheral surface of the flange in the circumferential direction. The electromagnetic solenoid device according to claim 1, wherein a recess having a flange and a width is formed.

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