Coil unit and electrically driven valve

Abstract

The present invention provides a coil unit that suppresses deterioration of lead wires, and an electrically driven valve. [Solution] The coil unit 30 comprises a coil case 11, a coil body portion 12 covered by the coil case 11, and lead wires 18 connected to the coil body portion 12. At least a portion of the lead wires 18 is covered by a tube 19, and the coil body portion 12, the lead wires 18, and the tip portions 17A of the tube 19 are molded together, with a portion of the molded portion 20 fitting into the gap S between the lead wires 18 and the tube 19.

Description

Technical Field

[0001] The present disclosure relates to a coil unit and an electric drive valve.

Background Art

[0002] There is known a coil unit in which a stator coil is molded with resin or the like to protect it from external impact and moisture, and is connected to an external control unit such as a substrate box by a lead wire (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When an external tension is applied to the lead wire, deterioration may progress rapidly at the end of the lead wire or the contact point with the coil unit.

[0005] An object of the present disclosure is to provide a coil unit and an electric drive valve that suppress deterioration of the lead wire.

Means for Solving the Problems

[0006] A coil unit according to one aspect of the present disclosure includes a coil case, a coil main body portion covered by the coil case, a lead wire connected to the coil main body portion, and at least a part of the lead wire is covered by a tube, and the coil main body portion, the tip portions of the lead wire and the tube are molded. A portion of the molded part is inserted into the gap between the lead wire and the tube.

[0007] An electrically driven valve relating to one aspect of this disclosure is The above-mentioned coil unit is included. [Effects of the Invention]

[0008] According to this disclosure, it is possible to provide a coil unit that suppresses deterioration of lead wires, and an electrically driven valve. [Brief explanation of the drawing]

[0009] [Figure 1] This is a partial cutaway view of an electrically driven valve according to an embodiment of the present disclosure. [Figure 2] This is a partial cross-sectional view of a coil unit according to the first embodiment of the present disclosure. [Figure 3] This is a partial cross-sectional view of a coil unit according to a second embodiment of the present disclosure. [Figure 4] This is a partial cross-sectional view of a coil unit according to a third embodiment of the present disclosure. [Figure 5] This is a partial cross-sectional view of the cable in Figure 4 when tension is applied. [Figure 6] This is a partial cross-sectional view of a coil unit relating to a reference example. [Modes for carrying out the invention]

[0010] The embodiments of this disclosure will be described below with reference to the drawings. For the sake of clarity, configurations having the same reference numerals as those already described in the description of the embodiments will be omitted from the description. Furthermore, the dimensions of the components shown in these drawings may differ from the actual dimensions of the components for the sake of clarity.

[0011] In the attached drawings, arrow U indicates the upward direction of the illustrated structure. Arrow D indicates the downward direction of the illustrated structure. Arrow L indicates the leftward direction of the illustrated structure. Arrow R indicates the rightward direction of the illustrated structure. These directional expressions are used for explanatory purposes only and do not limit the actual orientation or direction of the illustrated structure in use.

[0012] Figure 1 is a partial cutaway view of an electrically driven valve 100 according to an embodiment of the present disclosure. Figure 1 shows a partial cutaway of the inside of the coil case 11 of the electrically driven valve 100. Hereinafter, this embodiment will be described using an electric valve, which is an example of an electrically driven valve 100.

[0013] The electrically driven valve 100 comprises a stator 10, a rotor (not shown), a can 24, a valve stem (not shown), a lifting mechanism (not shown), a valve body (not shown), and a valve body 60. The can 24 is located in the internal space of the stator 10 and houses the rotor, valve stem, and lifting mechanism inside. The stator 10 and rotor function as a motor, controlling the rotation of the valve stem around the central axis Y. The rotational force of the valve stem is transmitted to the valve body located below the rotor via the lifting mechanism. The valve body is driven and controlled in the central axis Y by the transmitted rotational force.

[0014] The valve body 60 has an inlet passage 61 extending in the X direction perpendicular to the central axis direction Y, an outlet passage 62 extending in the central axis direction Y, and a valve chamber (not shown) located below the valve body. The valve body is driven in the central axis direction Y and opens or closes the outlet passage 62 by seating on or separating from a valve seat (not shown) formed at the opening of the outlet passage 62. Therefore, when the valve body is open, the fluid flowing in from the inlet passage 61 flows out to the outlet passage 62 via the valve chamber, and when the valve body is closed, it remains in the valve chamber without flowing out to the outlet passage 62.

[0015] The stator 10 includes a stator core 10C and a coil unit 30. The coil unit 30 includes a coil case 11, a coil body portion 12 covered by the coil case 11, and a cable 17 electrically connected to the coil body portion 12.

[0016] The coil case 11 has an opening 21 on the bottom surface for inserting the cable 17 into the inside of the coil case 11. The coil body portion 12 includes a plurality of coils 13 arranged vertically, a coil terminal pin 14, and an intermediate substrate 15. The plurality of coils 13 are each wound around the stator core 10C. The coil terminal pin 14 electrically connects the plurality of coils 13 and the intermediate substrate 15. The intermediate substrate 15 has a connector 16 connected to the cable 17. A motor drive signal is transmitted to the plurality of coils 13 from the outside via the cable 17, the intermediate substrate 15, and the coil terminal pin 14, thereby driving and controlling the rotor. Note that the coil body portion 12 may be configured without the coil terminal pin 14 and the intermediate substrate 15, and the cable 17 may be directly connected to the plurality of coils 13.

[0017] FIG. 2 is a partial cross-sectional view of the coil unit 30 according to the first embodiment of the present disclosure. As shown in FIG. 2, the cable 17 has a lead wire 18 and a tube 19. The lead wire 18 includes one or two or more conductive wires. At least a part of the lead wire 18 is covered by the tube 19 with a gap S therebetween. By covering the lead wire 18 with the tube 19, damage to the lead wire 18 due to an external impact and deterioration of the lead wire 18 due to adhesion of water droplets or the like can be suppressed.

[0018] At least a part of the coil body portion 12 is molded (inner molded) by a resin member. In the following description, the resin member is also referred to as an inner mold portion 23. Further, between the coil body portion 12 and the coil cover, it is molded by a casting resin. In the example of FIG. 2, the coil terminal pin 14, the intermediate substrate 15, and the connector 16 are molded (cast molded) by a resin member (for example, urethane resin or epoxy resin). In the following description, the resin member is also referred to as a mold portion 20. Also, the bottom surface of the mold portion 20 covering the coil body portion 12 is defined as a second bottom surface 20B, and the portion of the lead wire 18 intersecting the second bottom surface 20B is defined as a first portion 18A.

[0019] To explain the details of the configuration of the coil unit 30 according to this embodiment, a reference example coil unit 30' will be described with reference to Figure 6.

[0020] Figure 6 is a partial cross-sectional view of a coil unit 30' according to a reference example. As shown in Figure 6, the tube 19 does not extend into the coil case 11. Therefore, the portion of the lead wire 18 above the first portion 18A is held by the molded portion 20, while the portion below the first portion 18A is not held by the molded portion 20 or the tube 19. Consequently, if, for example, tension is applied to the lead wire 18 from the outside in the rightward direction R, the load of this tension will be concentrated on the first portion 18A of the lead wire 18, which may accelerate the deterioration of the first portion 18A.

[0021] Therefore, the inventor focused on a configuration for the coil unit 30 that can suppress deterioration at the first part 18A where external tension loads are concentrated.

[0022] Returning to the explanation of Figure 2, in the coil unit 30 according to the first embodiment of the present disclosure, as shown in Figure 2, a portion of the tube 19 extends into the interior of the coil case 11. In addition, at least a portion of the coil body 12, and the tip portions 17A of the lead wires 18 and tube 19 are molded by the mold portion 20. Here, the tip portions 17A of the lead wires 18 and tube 19 refer to the portions of the lead wires 18 and tube 19 above the first bottom surface 20A. Furthermore, a portion of the mold portion 20 extends downward U into the gap S between the lead wires 18 and tube 19.

[0023] Here, the bottom surface of the molded portion 20 that has entered the gap S is defined as the first bottom surface 20A. In the example shown in Figure 2, the first bottom surface 20A is located between the second bottom surface 20B and the opening 21.

[0024] In this way, the first part 18A, where the external tensile load is concentrated, is held in place by a portion of the molded part 20 that fits into the gap S, and by the tube 19. Therefore, even if tension is applied to the lead wire 18, deterioration of the first part 18A can be suppressed.

[0025] Furthermore, at least a portion of the tip portion 17A of the tube 19 may have higher bending strength than other parts. Specifically, at least a portion of the tip portion 17A may be provided with a reinforcing member such as a metal plate or a metal pipe. In addition, the tube 19 included in at least a portion of the tip portion 17A may have a thicker wall than other parts of the tube 19, or may contain a resin with high bending strength. This can further suppress deterioration in the first portion 18A.

[0026] Furthermore, the tube 19 may be made of a flexible resin such as urethane resin or epoxy resin. In addition, the tube 19 may be made of a material that has high wettability with respect to the resin of the molded part 20 before curing.

[0027] Figure 3 is a partial cross-sectional view of a coil unit 30 according to the second embodiment of the present disclosure. As shown in Figure 3, a portion of the molded portion 20 is inserted downward U into the gap S, and the first bottom surface 20A and the second bottom surface 20B are flush.

[0028] In this way, the portion of the lead wire 18 above the first portion 18A where the external tension load is concentrated is held by a part of the molded portion 20 that fits into the gap S and by the tube 19. Furthermore, the portion of the lead wire 18 below the first portion 18A is held by the tube 19 when, for example, tension is applied to the lead wire 18 in the rightward direction R, the gap S is compressed and eliminated by the tension, and the lead wire comes into contact with the tube 19 and is held by the tube 19. Therefore, even when tension is applied to the lead wire 18, deterioration of the first portion 18A can be suppressed. In addition, since a part of the molded portion 20 only fits into the first bottom surface 20A which is flush with the second bottom surface 20B, the cable 17 has greater flexibility and the routing of the cable 17 becomes easier.

[0029] Figure 4 is a partial cross-sectional view of a coil unit 30 according to a third embodiment of the present disclosure. As shown in Figure 4, a portion of the molded portion 20 extends downward U into the gap S, and the first bottom surface 20A is located below the opening 21.

[0030] The projection start position is defined as the center of the first part 18A, where the molded part 20 protrudes from the second bottom surface 20B. The projection length from the projection start position to the first bottom surface 20A is defined as L1, and the distance from the projection start position to the opening edge 22 that forms the opening 21 is defined as L2. The projection length L1 may be longer than the distance L2.

[0031] Thus, the first part 18A, where the external tensile load is concentrated, is held in place by a portion of the molded part 20 that fits into the gap S between the lead wire 18 and the tube 19, and by the tube 19. Therefore, as shown in Figure 5, for example, even if tension is applied to the lead wire 18 in the rightward direction R, deterioration of the first part 18A can be suppressed.

[0032] Furthermore, as shown in Figure 5, for example, tension is applied to the cable 17 in the rightward direction R, which may cause a portion of the tube 19 to come into contact with the opening edge 22. Even in this case, if the protruding length L1 of the portion of the molded part 20 is longer than the protruding length L2, the second portion 18B of the lead wire 18, which is subjected to a load from the opening edge 22, is held in place by the portion of the molded part 20 that has entered the gap S and the tube 19. Therefore, deterioration of the second portion 18B can also be suppressed.

[0033] As described above, since a portion of the molded portion 20 is inserted into the gap S between the lead wire 18 and the tube 19, the first portion 18A, where the external tension load is concentrated, is held by a portion of the molded portion 20 or at least one of the tube 19. Therefore, even if tension is applied to the lead wire 18 from the outside, deterioration of the lead wire 18 (especially the first portion 18A and the second portion 18B) can be suppressed.

[0034] While embodiments of this disclosure have been described above, it goes without saying that the technical scope of this disclosure should not be interpreted restrictively by the description of these embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications to the embodiments are possible within the scope of the invention described in the claims. The technical scope of this disclosure should be determined based on the scope of the invention described in the claims and the scope of its equivalents.

[0035] For example, the lead wire 18 according to the embodiment of this disclosure may include a portion that is not covered by the tube 19 in a region U below the first bottom surface 20A. This improves the flexibility of the cable 17.

[0036] The coil unit 30 according to the embodiment of this disclosure has been described in the case where it is mounted on an electric valve, which is an example of an electrically driven valve 100. In this case, the coil unit 30 is an electric coil. The coil unit 30 may also be mounted on a solenoid valve. In this case, the coil unit 30 is an electromagnetic coil. [Explanation of symbols]

[0037] 10: Status 10C: Stator Core 11: Coil Case 12: Coil body 13: Coil 14: Coil terminal pins 15: Relay board 16: Connector 17: Cable 17A:Tip 18: Lead wire 18A:First part 18B:Second part 19: Tube 20: Mold part 20A: First bottom surface 20B: Second bottom surface 21: Opening 22: Opening edge 23: Inner mold section 24: Can 30, 30': Coil unit 100: Electrically driven valve

Claims

1. Coil case and The coil body portion covered by the aforementioned coil case, The lead wires connected to the coil body, Equipped with, At least a portion of the lead wire is covered by a tube, At least a portion of the coil body, the lead wire, and the tip of the tube are molded together. A coil unit characterized in that a portion of the molded part is inserted into the gap between the lead wire and the tube.

2. The coil case has an opening on its bottom surface. The coil unit according to claim 1, wherein the first bottom surface of the molded portion that fits into the gap between the lead wire and the tube is located between the second bottom surface of the molded portion that covers the coil body and the opening.

3. The coil unit according to claim 1, wherein the first bottom surface of the molded portion that fits into the gap between the lead wire and the tube and the second bottom surface of the molded portion that covers the coil body are flush.

4. The coil body has an opening on its bottom surface. The coil unit according to claim 1, wherein the protrusion length of the lead wire from the protrusion start position where it protrudes from the second bottom surface of the molded portion covering the coil body to the first bottom surface of the molded portion where it enters the gap between the lead wire and the tube is longer than the separation distance from the protrusion start position to the opening edge portion that forms the opening.

5. The coil unit according to claim 1, wherein at least a portion of the tip of the tube has higher bending strength than other parts.

6. The coil unit according to claim 1, wherein the tube is made of urethane resin or epoxy resin.

7. The coil unit according to claim 1, wherein the coil unit is an electric coil or an electromagnetic coil.

8. An electrically driven valve comprising a coil unit according to any one of claims 1 to 7.

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