JP2017062044A - Electromagnetic valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic valve which enables improvement of workability in assembly of an electromagnetic coil assembly to a valve body part.SOLUTION: An electromagnetic coil assembly in an electromagnetic valve includes: a coil part 20 in a bobbin 21 which is disposed at an outer periphery part of a cylindrical part 26 of a valve body part 10; a suction element 24 which closes one end of the cylindrical part 26; and a casing 16 which covers the coil part 20 and the resin bobbin 21 and houses the coil part 20 and the resin bobbin 21 therein. An O ring 30 seals a gap between an outer periphery part of the cylindrical part 26 of the valve body part 10 and an inner periphery part of a cylindrical part 22A of a lower plate 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electromagnetic valve that is incorporated in an air conditioner, a vending machine, a refrigerator, or the like and controls the flow of a fluid such as a refrigerant.

  In a solenoid valve, for example, as shown in Patent Document 1, an electromagnetic coil assembly is attached to a valve main body portion (referred to as a plunger case in FIG. 7 in Patent Document 1) already connected to a pipe for piping. Those that can be assembled by field work are in practical use. In such an electromagnetic valve, for example, as shown in FIG. 12 in the accompanying drawings of the present application, the electromagnetic coil assembly 6 can be attached to and detached from the valve body 1 connected to the piping pipe 2 and the piping pipe 4. It is assembled to. The electromagnetic valve is configured to include the valve main body 1 and the electromagnetic coil assembly 6 as main elements.

  The cylindrical portion of the valve main body 1 has an aspirator 3 and a plunger unit mechanism inside. The plunger unit mechanism includes a plunger (not shown), a valve body provided at the tip of the plunger, and a coil spring that biases the plunger. In addition, the pipe connecting portion of the valve body 1 includes an inlet port to which one end of the piping pipe 2 is connected on an axis substantially orthogonal to the central axis, and a piping pipe 4 on an axis common to the central axis. And an outlet port to which one end of each is connected. The cylindrical part and the pipe connection part of the valve body part 1 are made of stainless steel and brass, respectively.

  The electromagnetic coil assembly 6 controls the operation of the plunger in the valve main body 1 so as to open and close a valve seat provided at an outlet port described later. The electromagnetic coil assembly 6 has a coil portion 5 disposed on the outer periphery of the cylindrical portion of the valve body portion 1 and selectively excites the above-described attractor 3 and plunger. The coil unit 5 is electrically connected to a drive control unit (not shown) via a lead wire. The coil unit 5 is accommodated in a bobbin in the housing of the electromagnetic coil assembly 6.

  In such a configuration, when the electromagnetic coil assembly 6 is assembled to the valve body 1, the valve body 1 is inserted into the inner peripheral portion of the bobbin via the opening of the housing of the electromagnetic coil assembly 6, and then the machine screw The electromagnetic coil assembly 6 is fixed to the valve body 1 by screwing 8 into the female screw hole of the attractor 3. In such a case, a predetermined gap is formed between the opening of the housing of the electromagnetic coil assembly 6 and the outer periphery of the cylindrical portion of the valve body 1. As a result, moisture contained in steam or the like in the atmosphere in which the electromagnetic valve is disposed enters through the gap along the direction indicated by the arrow EV, and the opening of the housing of the electromagnetic coil assembly 6 and the outer peripheral portion of the valve main body 1. May stay between. In such a case, as shown in FIG. 12, the volume DE increases due to the formation of a portion DE where the moisture freezes due to a temperature change or the like in the atmosphere, thereby causing a crack CR in the inner peripheral portion of the bobbin. May result in poor insulation.

  As a countermeasure in such a case, in a solenoid valve, for example, as shown in FIG. 1 in Patent Document 2, an O-ring as a seal member is adjacent to the insertion hole of the yoke of the electromagnetic coil assembly and the fixed iron core It is provided between the outer peripheral portion and the mold resin layer covering the yoke, and between the outer peripheral portion of the guide guide inserted into the insertion hole of the yoke of the electromagnetic coil assembly and the mold resin layer.

JP2013-58667A JP 9-266112 A

  However, in the above-described electromagnetic valve, when an O-ring as a seal member is provided as shown in Patent Document 2, when the electromagnetic coil assembly is assembled to the valve main body, the electromagnetic coil assembly is fixed to the valve main body. In addition to the work to be performed, the work of mounting the O-ring between the outer peripheral part of the fixed iron core and the mold resin layer covering the yoke is also required, so the work of fixing the electromagnetic coil assembly to the valve body part becomes complicated, Parts management such as O-rings is also required on site.

  In view of the above problems, an object of the present invention is to provide an electromagnetic valve that can improve the workability of assembling the valve body of an electromagnetic coil assembly.

  In order to achieve the above object, the solenoid valve according to the present invention has an inlet port connected to the first passage and an outlet port connected to the second passage. A valve body portion having a housing portion that movably houses a plunger unit that communicates and controls opening and closing of the outlet port, and an inner peripheral portion into which the housing portion of the valve body portion is detachably inserted, and holds the coil portion. Bobbin has a cylindrical part that forms part of the inner peripheral part of the bobbin, and seals the gap between the coil part and the casing that houses the bobbin, and the outer peripheral part of the accommodating part of the valve body part and the inner peripheral part of the bobbin And an electromagnetic coil assembly that causes the plunger unit to perform an operation of opening and closing the outlet port.

  The solenoid valve according to the present invention has an inlet port connected to the first passage and an outlet port connected to the second passage, and communicates with the inlet port and the outlet port. A valve main body having an accommodating portion that movably accommodates a plunger unit that controls opening and closing; a bobbin that has an inner peripheral portion into which the accommodating portion of the valve main body is detachably inserted; A casing having an opening into which the housing portion is detachably inserted and housing the coil portion and the bobbin; the casing is joined to the periphery of the opening of the casing; and the periphery of the opening of the casing and the outer periphery of the housing of the valve body And an electromagnetic coil assembly that causes the plunger unit to perform an operation of opening and closing the outlet port.

According to the electromagnetic valve of the present invention, the electromagnetic coil assembly has a bobbin having an inner peripheral part into which the accommodating part of the valve main body part is detachably inserted and holding the coil part, and a part of the inner peripheral part of the bobbin A casing that has a cylindrical portion that forms a coil portion and a bobbin, and a seal that is joined to the periphery of the opening of the casing and seals a gap between the outer peripheral portion of the accommodating portion of the valve body portion and the inner peripheral portion of the bobbin Therefore, the work of assembling the electromagnetic coil assembly with respect to the valve main body can be improved by omitting the mounting work of the seal member.

FIG. 1 is a cross-sectional view showing a configuration of a first embodiment of a solenoid valve according to the present invention together with a pipe for piping. FIG. 2 is a partial cross-sectional view showing the example shown in FIG. 1 together with a pipe for piping. FIG. 3 is an exploded sectional view showing the electromagnetic coil assembly used in the example shown in FIG. FIG. 4 is a partial cross-sectional view showing the configuration of a second embodiment of the electromagnetic valve according to the present invention together with a pipe for piping. FIG. 5 is a cross-sectional view showing a configuration of a third embodiment of the electromagnetic valve according to the present invention together with a pipe for piping. FIG. 6 is a cross-sectional view showing the configuration of a fourth embodiment of the electromagnetic valve according to the present invention together with a pipe for piping. FIG. 7 is a partial cross-sectional view showing a configuration of a fifth embodiment of the electromagnetic valve according to the present invention, together with a pipe for piping. FIG. 8A is a partial cross-sectional view showing a configuration of a sixth embodiment of the electromagnetic valve according to the present invention, together with a pipe for piping. FIG. 8B is a diagram for explaining assembly in the example shown in FIG. 8A. FIG. 9 is a partial cross-sectional view showing a modification of the bobbin in the example shown in FIG. FIG. 10 is a partial cross-sectional view showing a further modification of the bobbin in the example shown in FIG. FIG. 11 is a partial cross-sectional view showing a further modification of the bobbin in the example shown in FIG. FIG. 12 is a partial cross-sectional view showing the configuration of a conventional solenoid valve.

  FIG. 2 shows a first embodiment of a solenoid valve according to the present invention together with connected piping pipes.

  In FIG. 2, the solenoid valve is, for example, a normally closed solenoid valve, and is disposed in a pipe in a refrigerant circuit in the air conditioner.

  As shown in FIG. 1, the solenoid valve includes a plunger unit that is movably disposed in a cylindrical portion 26 of a valve body portion 10 to be described later, a valve body portion 10 having the cylindrical portion 26, and a valve body portion. 10 and an electromagnetic coil assembly that selectively arranges an attractor 24 and a plunger unit, which will be described later, are arranged as the main elements.

  The electromagnetic coil assembly includes a coil portion 20 in a bobbin 21 disposed on an outer peripheral portion of the cylindrical portion 26 of the valve body portion 10, an attractor 24 that closes one end of the cylindrical portion 26, the coil portion 20 and a resin. The casing 16 that covers the bobbin 21 and accommodates it inside is configured as a main element. The coil unit 20 is electrically connected to a drive control unit (not shown) via a lead wire (not shown). One end surface of the attractor 24 receives one end of the coil spring 34. The coil spring 34 is disposed between one end face of the suction member 24 and the bottom of the concave portion of the plunger 28, and biases the plunger 28 in a direction away from the suction member 24, that is, a valve seat side described later. It is supposed to be.

  As shown in FIG. 3, the through hole formed in the inner peripheral part of the bobbin 21 into which the cylindrical part 26 of the valve body part 10 is inserted has a small diameter part 21b and a tapered hole 21a larger than the small diameter part 21b. It consists of. The taper angle α of the taper hole 21a is set to be greater than 0 ° and equal to or less than 10 °, for example. A step portion is formed at a boundary portion between the small diameter portion 21b and the tapered hole 21a. An O-ring 30 as a seal member is inserted into the step portion of the tapered hole 21a. Further, as shown in FIG. 1, a cylindrical portion 22 </ b> A of a lower plate 22 that forms the lower end of the casing 16 is inserted into the tapered hole 21 a.

  The lower plate 22 is made of, for example, a metal material (magnetic material), and includes a cylindrical portion 22A inserted into the tapered hole 21a and a flat portion 22B connected to the base end of the cylindrical portion 22A. The cylindrical portion 22A has a hole 22a in which a cylindrical portion 26 of the valve main body 10 to be described later is inserted.

  When the lower plate 22 is attached to the lower end of the casing 16, after the O-ring 30 is inserted into the step portion of the tapered hole 21a, the cylindrical portion 22A is then inserted into the tapered hole 21a and the flat portion of the lower plate 22 is inserted. The outer peripheral edge of 22B is caulked and fixed to the lower end of the casing 16, as shown in Patent Document 1. For example, as indicated by a two-dot chain line in FIG. 3, the O-ring 30 may be inserted into the step portion of the tapered hole 21a using a jig JG having a truncated cone portion. That is, first, the truncated cone part of the jig JG is inserted into the hole 22a of the lower plate 22, and in addition, the distal end part of the truncated cone part is inserted into the O-ring 30 to be mounted, and then the jig is repaired. The cylindrical portion 22A and the O-ring 30 of the lower plate 22 are inserted into the tapered hole 21a with the tool JG. Then, the mounting of the O-ring 30 is completed by pulling out the truncated cone portion of the jig JG from the hole 22a of the cylindrical portion 22A. At that time, grease or the like may be applied to the O-ring 30.

  As a result, the O-ring 30 seals the gap between the outer peripheral portion of the cylindrical portion 26 of the valve main body portion 10 and the inner peripheral portion of the cylindrical portion 22A of the lower plate 22, so that steam or the like passes through the gap to the inner peripheral portion of the bobbin 21. There is no risk of water intrusion. As a result, the situation where the bobbin 21 breaks due to freezing of moisture such as steam is avoided.

  The position along the central axis of the plunger 28 in the step portion of the tapered hole 21a in which the O-ring 30 is inserted is set to a predetermined dimension B from the lower end of the casing 16, as shown in FIG. The O-ring groove into which the O-ring 30 is inserted is formed by the stepped portion of the tapered hole 21 a of the bobbin 21 and the end surface of the cylindrical portion 22 </ b> A of the lower plate 22.

  The position along the central axis of the plunger 28 at the upper end of the cylindrical portion 22A is set to a predetermined dimension A shorter than the dimension B from the lower end of the casing 16 in consideration of a crushing margin suitable for the size of the O-ring 30. Yes. The dimension A is preferably smaller than the predetermined dimension C from the lower end. This is because if the dimension A is larger than the predetermined dimension C from the lower end, the operation of the plunger 28 may be hindered. Accordingly, the O-ring 30 is accurately positioned at the stepped portion of the tapered hole 21a by the cylindrical portion 22A, and the cylindrical portion 22A of the lower plate 22 made of a magnetic material is deepened to an appropriate position on the inner peripheral portion of the bobbin 21. Since it penetrates, the magnetic efficiency of the coil part 20 can be maximized.

  The valve body 10 is made of a metal material such as brass or stainless steel, and has a cylindrical portion 26 that houses the plunger unit. One end of the cylindrical portion 26 is closed by the suction element 24. A predetermined chamfer is applied to the end portion of the suction element 24 so that one end portion of the cylindrical portion 26 can be easily inserted into a hole 22a of a cylindrical portion 22A of the lower plate 22 described later. One end of a high-pressure side piping pipe 12 serving as a first passage is connected to a base portion (hereinafter also referred to as a pipe connecting portion) connected to the cylindrical portion 26 on an axis substantially orthogonal to the central axis of the plunger 28. An inlet port 10PI and an outlet port 10PE to which one end of a low-pressure side piping pipe 14 serving as a second passage is connected are formed on the same axis as the central axis of the plunger 28.

  A different-diameter socket portion 11 having a valve seat 11V is provided at the opening end portion of the outlet port 10PE. The valve seat 11V has a through hole communicating with the open end of the outlet port 10PE.

  A ball valve 32 as a valve body is selectively brought into contact with the periphery of the through hole of the valve seat 11V. Thereby, when the plunger 28 is pushed down, the ball valve 32 closes the through hole of the valve seat 11V.

  Therefore, the drive mechanism for the plunger unit, which will be described later, includes the above-described electromagnetic coil assembly and the coil spring 34.

  The plunger unit includes a plunger 28 that is movably disposed in the cylindrical portion 26 of the valve main body 10 described above, and a ball valve 32 that is held in a recess at the other end of the plunger 28. Yes.

  The plunger 28 is made of, for example, a magnetic material, and has a hole in one end portion into which the other end of the coil spring 34 is inserted, as shown in FIG. A concave portion in which the ball valve 32 is inserted and held is formed at the other end of the plunger 28.

  When the above-described electromagnetic coil assembly is assembled to the valve main body 10 connected to the high-pressure side piping pipe 12 and the low-pressure side piping pipe 14, the cylindrical portion 26 of the valve main body 10 is connected to the lower plate 22 of the electromagnetic coil assembly. After being inserted into the hole 22 a of the cylindrical portion 22 </ b> A, the end of the suction element 24 of the valve main body portion 10 is pushed in until it comes into contact with the inner peripheral surface of the casing 16. Then, the machine screw 18 is screwed into the female screw hole of the suction element 24 through the hole 16 a of the casing 16. Therefore, the electromagnetic coil assembly can be easily and quickly assembled to the valve main body 10 connected to the high-pressure side piping pipe 12 and the low-pressure side piping pipe 14 without attaching the O-ring 30.

  In such a configuration, when the attractor 24 and the plunger 28 are not excited by the coil portion 20, the ball valve 32 comes into contact with the valve seat 11V, whereby the fluid from the high-pressure side piping pipe 12 is shut off. On the other hand, when the attractor 24 and the plunger 28 are excited by the coil portion 20, the attractor 24 and the plunger 28 are brought close to each other by the attraction force, and the ball valve 32 is against the biasing force of the coil spring 34. Separated with respect to 11V. Accordingly, the working fluid from the high-pressure side piping pipe 12 is supplied to the low-pressure side piping pipe 14 along the direction indicated by the arrow F in FIG. Thereafter, when the attractor 24 and the plunger 28 are not excited, the ball valve 32 comes into contact with the valve seat 11V by the urging force of the coil spring 34, and the working fluid from the high-pressure side pipe 12 is shut off.

  FIG. 4 shows a second embodiment of the solenoid valve according to the present invention together with connected piping pipes.

  In FIG. 4, the same constituent elements in the example shown in FIG. 1 are denoted by the same reference numerals, and redundant description thereof is omitted.

  In the example shown in FIG. 1, the O-ring 30 is inserted only in the step portion of the tapered hole 21 a of the bobbin 21, but in the example shown in FIG. It is also inserted into the O-ring groove 21′Ga at the upper end of the bobbin 21 ′ to be accommodated.

  The through hole formed in the inner peripheral portion of the bobbin 21 ′ into which the valve main body 10 is inserted includes a small diameter portion 21 ′ b and a tapered hole 21 ′ a larger than the small diameter portion 21 ′ b. The taper angle α of the taper hole 21'a is set to be greater than 0 ° and equal to or less than 10 °, for example. A step portion is formed at a boundary portion between the small diameter portion 21'b and the tapered hole 21'a. An O-ring 30 as a seal member is inserted into the step portion of the tapered hole 21'a. Further, the cylindrical portion 22A of the lower plate 22 that forms the lower end of the casing 16 is inserted into the tapered hole 21'a. Further, an O-ring groove 21'Ga is formed on the inner peripheral edge of the opening end that opens to the inner peripheral surface of the casing 16 in the small diameter portion 21'b. Thus, moisture or the like that has entered through the gap between the hole 16a of the casing 16 and the outer peripheral portion of the small screw 18 enters the gap between the outer peripheral surface of the valve main body 10 and the inner peripheral surface of the small-diameter portion 21′b of the bobbin 21 ′. Invasion is avoided.

  FIG. 5 shows a third embodiment of the solenoid valve according to the present invention together with connected piping pipes.

  In FIG. 5, the solenoid valve is, for example, a normally open solenoid valve, and is disposed in a pipe in a refrigerant circuit in the air conditioner.

  As shown in FIG. 5, the solenoid valve includes a plunger unit that is movably arranged in a cylindrical portion of a valve body portion 40 described later, a valve body portion 40, and an outer peripheral portion of the cylindrical portion of the valve body portion 40. And an electromagnetic coil assembly that selectively excites the plunger unit as main elements.

  The electromagnetic coil assembly mainly includes a coil portion 50 in the bobbin 51, a pipe 38 with a slit disposed integrally with an inner peripheral portion of the bobbin 51, and a casing 36 that covers the coil portion 50 and the bobbin 51 and is accommodated inside. Configured as an element. The coil unit 50 is electrically connected to a drive control unit (not shown) via a lead wire. The bobbin 51 has an inner peripheral portion into which a cylindrical outer peripheral portion of a valve main body portion 40 described later is inserted. The slit pipe 38 is formed of a magnetic material in a cylindrical shape. As shown in FIG. 5, the slitted pipe 38 penetrates deeply to an appropriate position in the inner peripheral portion of the bobbin 51, so that the magnetic efficiency of the coil portion 50 can be maximized.

  An O-ring 30 is inserted into an O-ring groove formed at the lower end of the slit pipe 38. As a result, the O-ring 30 seals the gap between the outer peripheral portion of the cylindrical portion of the valve main body 40 and the outer peripheral portion of the slit pipe 38, so that moisture such as steam enters the inner peripheral portion of the bobbin 51 through the gap. There is no risk of intrusion. As a result, a situation where the bobbin 51 breaks due to freezing of moisture such as steam is avoided. The O-ring 30 may be inserted using, for example, the jig JG as described above.

  As shown in FIG. 5, the position of the lower end of the slit pipe 38 is set to a position having a predetermined dimension A from the upper end of the outer peripheral portion of the casing 36. Further, the position along the central axis of the valve main body 40 in the O-ring groove into which the O-ring 30 is inserted is set to a predetermined dimension B larger than the dimension A from the upper end of the outer peripheral part of the casing 36. . The dimension A to the position of the lower end of the pipe 38 with the slit is preferably smaller than the predetermined dimension C from the upper end larger than the predetermined dimension A from the upper end of the outer peripheral portion of the casing 36. For example, when the plunger 52 described later is not excited and the coil spring 48 has a natural length, the dimension C is from the step portion 52S of the plunger 52 that receives one end of the coil spring 48 to the upper end of the outer peripheral portion of the casing 36. Represents the distance.

  This is because when the dimension A is larger than the predetermined dimension C from the upper end, the operation of the plunger 52 described later may be hindered. Accordingly, the O-ring 30 is accurately positioned in the O-ring groove by the pipe 38 with the slit, and the pipe 38 with the slit has penetrated to an appropriate position in the inner peripheral portion of the bobbin 51. Efficiency can be maximized.

  A fixing leaf spring 37 for detachably attaching the electromagnetic coil assembly to the valve body 40 is provided on the lower end surface of the casing 36. A bent distal end portion of the fixing leaf spring 37 that can be elastically displaced is engaged with one of a plurality of recesses provided in the outer peripheral portion of the valve main body portion 40 along the circumferential direction of the valve main body portion 40. Has been.

  The valve main body 40 is made of a metal material, for example, brass, stainless steel or the like, and has a cylindrical portion that accommodates the plunger unit. One end of the cylindrical portion is closed by the cap member 40CA. A plunger unit is movably disposed on the inner peripheral portion of the cylindrical portion. The plunger unit includes the above-described plunger 52 and a valve body 52 a connected to the plunger 52. The base end portion of the valve body 52a is connected by caulking after being inserted into the through hole of the plunger 52. In addition, a coil spring 48 is provided between the step portion formed at the lower end portion of the cylindrical portion and the lower end of the plunger 52 to urge the plunger 52 in the direction approaching the cap member 40CA.

  An inlet port 40PI to which one end of a high-pressure side piping pipe 42 serving as a first passage is connected on an axis substantially orthogonal to the central axis of the plunger 52 is connected to the base connected to the cylindrical portion; An outlet port 40PE to which one end of a low-pressure side piping pipe 44 serving as a second passage is connected is formed on an axis common to the central axis.

  A different-diameter socket 46 having a valve seat 46V is provided at the opening end of the outlet port 40PE. The valve seat 46V has a through hole communicating with the open end of the outlet port 40PE.

  When the plunger 52 is pushed down against the urging force of the coil spring 48, the valve body 52a is selectively brought into contact with the periphery of the through hole of the valve seat 46V. Thereby, the valve body 52a will close the through-hole of the valve seat 46V.

  Therefore, the plunger unit driving mechanism, which will be described later, includes the above-described electromagnetic coil assembly and the coil spring 48.

  When the above-described electromagnetic coil assembly is assembled to the valve body 40 connected to the high-pressure side piping pipe 42 and the low-pressure side piping pipe 44, the tip of the cylindrical portion of the valve body 40 is the casing of the electromagnetic coil assembly. After being inserted into the hole 36 and the inner peripheral portion of the bobbin 51, the distal end portion of the fixing leaf spring 37 is pushed in until it engages with a predetermined recess in the outer peripheral portion of the valve main body portion 40. Therefore, the electromagnetic coil assembly can be easily and quickly assembled to the valve main body 40 connected to the high-pressure side piping pipe 42 and the low-pressure side piping pipe 44 without the operation of mounting the O-ring 30.

  In such a configuration, when the plunger 52 is not excited by the coil portion 50, the valve body 52a is separated from the valve seat 46V, so that the working fluid from the high-pressure side piping pipe 42 is in the direction indicated by the arrow F in FIG. Along the pipe 44 for low-pressure side piping. On the other hand, when the plunger 52 is excited by the coil unit 50, the fluid from the high-pressure side piping pipe 42 is blocked by the plunger 52 coming into contact with the valve seat 46V and then coming into contact therewith. Thereafter, when the plunger 52 is not excited, the valve body 52a is separated from the valve seat 46V by the urging force of the coil spring 48, and the working fluid from the high-pressure side piping pipe 42 is along the direction indicated by the arrow F in FIG. It will be supplied to the low pressure side piping pipe 44.

  FIG. 6 shows a fourth embodiment of the solenoid valve according to the present invention together with connected pipes for piping. In addition, the same code | symbol is attached | subjected and shown about the same component in the example shown by FIG. 5, and the duplication description is abbreviate | omitted.

  In the example shown in FIG. 5, the O-ring 30 is inserted only into the O-ring groove formed at the lower end of the slit pipe 38 in the bobbin 51, but in the example shown in FIG. The O-ring 31 is also inserted into the O-ring groove 51′Ga at the lower end of the bobbin 51 ′ that houses the coil 50. Accordingly, moisture and the like pass between the hole 36a of the casing 36 and the outer peripheral portion of the cylindrical portion of the valve main body 40 between the outer peripheral surface of the cylindrical portion of the valve main body 40 and the inner peripheral surface of the bobbin 51 '. Intrusion into the gap is avoided.

  FIG. 7 shows a fifth embodiment of the electromagnetic valve according to the present invention together with connected piping pipes. In addition, the same code | symbol is attached | subjected and shown about the same component in the example shown by FIG. 1, and the duplication description is abbreviate | omitted.

  The solenoid valve is, for example, a normally closed solenoid valve, and is disposed in a pipe in a refrigerant circuit in the air conditioner.

  As shown in FIG. 7, the solenoid valve includes a plunger unit movably arranged in the cylindrical portion 26, a valve main body portion 10 ′ having the cylindrical portion 26, and a cylindrical portion of the valve main body portion 10 ′. 26, and an electromagnetic coil assembly that selectively arranges an attractor 24 and a plunger unit, which will be described later, disposed on the outer periphery of the main body 26 as main elements.

  The pipe connecting portion and the cylindrical portion 26 of the valve main body portion 10 'are made of brass and stainless steel, respectively. The diameter of the pipe connecting portion of the valve body 10 ′ is larger than the diameter of the cylindrical portion 26. Thereby, a step portion is formed at the boundary portion between the pipe connecting portion of the valve main body portion 10 ′ and the cylindrical portion 26.

  The electromagnetic coil assembly includes a coil part 60 in a bobbin 61 disposed on the outer peripheral part of the cylindrical part 26 of the valve body part 10 ', an attractor 24 that closes one end of the cylindrical part 26, a coil part 60, and a resin. A casing 56 that covers the inner bobbin 61 and accommodates it inside is configured as a main element. The coil unit 60 is electrically connected to a drive control unit (not shown) via a lead wire.

  The inner peripheral portion 61a of the bobbin 61 into which the cylindrical portion 26 of the valve main body portion 10 'is inserted and the open end of the through hole 56a of the casing 56 open toward the base portion of the valve main body portion 10'. A packing 62 as a seal member is disposed between the opening end of the through hole 56a of the casing 56 and the stepped portion of the pipe connecting portion of the valve main body 10 '. The packing 62 is bonded to the periphery of the through hole 56 a of the casing 56.

  The packing 62 is formed in a rectangular shape using, for example, adhesive butyl rubber. The shape of the packing 62 is not limited to such an example, and may be a circular shape, for example. The material of the packing 62 is not limited to butyl rubber, but may be made of other adhesive materials.

  The packing 62 has a circular hole 62a into which the cylindrical portion 26 is inserted at the center. The peripheral edge portion of the hole 62a in the packing 62 is sandwiched between the stepped portion of the pipe connecting portion of the valve main body portion 10 'and the peripheral edge of the through hole 56a of the casing 56, and enters the gap. Thereby, moisture and the like pass through the gap between the hole 56a of the casing 56 and the outer peripheral portion of the cylindrical portion 26 of the valve main body portion 10 ′, and the outer peripheral surface of the cylindrical portion 26 of the valve main body portion 10 ′ and the inner peripheral surface of the bobbin 61. Intrusion into the gap between the two is avoided.

  When the above-described electromagnetic coil assembly is assembled to the valve body 10 ′ connected to the high-pressure side piping pipe 12 and the low-pressure side piping pipe 14, the tip of the valve body 10 ′ is connected to the casing 56 of the electromagnetic coil assembly. After being inserted into the hole 56 a and the inner peripheral portion 61 a of the bobbin 61, it is pushed in until the cylindrical portion 26 of the valve main body portion 10 ′ contacts the inner peripheral surface of the casing 56. Then, the machine screw 18 is screwed into the female screw hole of the suction element 24 through the hole 56 b of the casing 56. Therefore, the electromagnetic coil assembly can be easily and quickly assembled to the valve main body portion 10 ′ connected to the high-pressure side piping pipe 12 and the low-pressure side piping pipe 14 without the work of attaching the packing 62.

  In each of the embodiments described above, an O-ring and packing are used as the seal member. However, the present invention is not limited to such an example, and other types of seal members such as a V-type seal are used. Of course, it may be. In the above example, the outlet port to which one end of the low-pressure side piping pipe as the second passage is connected is formed on the same axis as the central axis of the plunger. However, the present invention is limited to such an example. For example, the outlet port may be formed such that the low-pressure side piping pipe and the high-pressure side piping pipe are on a common straight line.

  Furthermore, in the examples shown in FIGS. 1, 4, 5, and 6, the valve body portion having the cylindrical portion is integrally made of the same material, but is limited to such an example. Alternatively, for example, only the cylindrical portion may be made as a separate part with a different material. Furthermore, although an example of the solenoid valve according to the present invention is applied to a direct acting solenoid valve in the above-described example, the invention is not limited to such an example, and may be applied to a pilot solenoid valve.

  FIG. 8A shows a sixth embodiment of the electromagnetic valve according to the present invention together with connected piping pipes. In FIG. 8A, the same components in the example shown in FIG. 7 are denoted by the same reference numerals, and redundant description thereof is omitted.

  In the example shown in FIG. 7, a packing 62 as a seal member is disposed between the opening end of the through hole 56 a of the casing 56 and the stepped portion of the pipe connection portion of the valve body 10 ′. In the example shown in FIG. 8A, in addition, a film 65 as a sealing layer is also provided between the inner peripheral surface of the upper part of the casing 56 in which the hole 56b is formed facing the through hole 56a and the upper end surface of the bobbin 63. It is arranged. The film 65 has a through hole 65a through which the machine screw 18 passes at the center. This prevents liquid or the like from entering the inner peripheral portion 63 a of the bobbin 63 from the outside between the inner peripheral surface of the upper portion of the casing 56 and the upper end surface of the bobbin 63 and through the small screw 18.

  As the material of the film 65, for example, polytetrafluoroethylene such as Teflon (registered trademark), polypropylene film, polyester film, vinyl chloride film, and aluminum adhesive tape may be used.

  Note that the present invention is not limited to such an example. For example, a Teflon coating film having a predetermined film thickness may be formed on the upper end surface of the bobbin 63 instead of the Teflon film 65.

  As shown in FIG. 8A, the solenoid valve includes a plunger unit movably arranged in the cylindrical portion 26, a valve main body portion 10 ′ having the cylindrical portion 26, and a cylindrical portion of the valve main body portion 10 ′. 26, and an electromagnetic coil assembly which is arranged on the outer peripheral portion 26 and selectively excites the attractor and the plunger unit as main elements.

  The electromagnetic coil assembly includes a coil portion 60 in a bobbin 63 disposed on the outer peripheral portion of the cylindrical portion 26 of the valve body portion 10 ', an attractor that closes one end of the cylindrical portion 26, a coil portion 60, and a resin. And a casing 56 that covers the bobbin 63 and accommodates it inside. The coil unit 60 is electrically connected to a drive control unit (not shown) via a lead wire. The inner peripheral portion 63b of the bobbin 63 into which the cylindrical portion 26 of the valve main body portion 10 'is inserted and the opening end of the through hole 56a of the casing 56 open toward the base portion of the valve main body portion 10'.

  When the above-described electromagnetic coil assembly is assembled to the valve main body 10 'connected to the high-pressure side piping pipe 12 and the low-pressure side piping pipe 14, as shown in FIG. After being assembled to the outer peripheral portion of the arranged bobbin 63, the distal end portion of the valve main body portion 10 'is inserted into the hole 56a of the casing 56 of the electromagnetic coil assembly and the inner peripheral portion of the bobbin 63, and then the valve main body It is pushed in until the suction element of the part 10 ′ comes into contact with the inner peripheral surface of the casing 56. Then, the machine screw 18 is screwed into the female screw hole of the suction element through the hole 56b of the casing 56 and the hole 65a of the film 65. Therefore, the electromagnetic coil assembly can be easily and quickly assembled to the valve main body 10 'connected to the high-pressure side piping pipe 12 and the low-pressure side piping pipe 14 without the work of attaching the film 65 and the packing 62. Can do.

  Furthermore, in the example shown in FIG. 1 described above, an O-ring 30 as a seal member is inserted into the stepped portion of the tapered hole 21a in the bobbin 21, but in the example shown in FIG. Between the inner peripheral surface of the upper end portion of the casing 16 in which the hole 16 a is formed and the upper end surface of the bobbin 29, a Teflon or rubber packing 27 is also disposed. The annular packing 27 has a hole 27a at the center. The packing 27 is inserted into an annular groove 29 </ b> G formed on the upper end surface of the bobbin 29. This prevents liquid or the like from entering the inner peripheral portion 29 b of the bobbin 29 from the outside between the inner peripheral surface of the upper portion of the casing 16 and the upper end surface of the bobbin 29 and through the small screw 18. In FIG. 9, the same constituent elements in the example shown in FIG. 1 are denoted by the same reference numerals, and redundant description thereof is omitted.

  In the example shown in FIGS. 1 and 2 described above, the film 65 may be attached to the upper end surface of the bobbin 21. In such a case, an annular groove may not be formed on the upper end surface of the bobbin 21 as in the example shown in FIG.

  Furthermore, without providing the packing 27 as described above, for example, as shown in FIG. 10, an annular lip portion 25 </ b> P as a sealing convex portion may be integrally formed on the upper end surface of the bobbin 25. . The lip portion 25P protrudes from the upper end surface by a predetermined height toward the inner peripheral surface of the upper portion of the casing 16. As a result, the tip of the lip portion 25P comes into contact with the inner peripheral surface of the upper portion of the casing 16 with a predetermined pressure, so that the outer portion of the lip portion 25P is externally connected between the upper peripheral surface of the casing 16 and the upper end surface of the bobbin 25 and The liquid or the like is prevented from entering the inner peripheral portion 25b of the bobbin 25. In FIG. 10, the same constituent elements in the example shown in FIG. 1 are denoted by the same reference numerals, and redundant description thereof is omitted.

  Then, instead of the annular lip portion 25P as the sealing convex portion as described above, an annular groove 23G1 having a predetermined depth and width is formed on the upper end surface of the bobbin 23, as shown in FIG. 23G2 may be formed as a sealing recess. The grooves 23G1 and 23G2 are formed concentrically around the inner periphery of the bobbin 23, respectively. As a result, since a predetermined amount of air is held at a predetermined pressure between the grooves 23G1 and 23G2 and the inner peripheral surface of the upper portion of the casing 16, the upper peripheral surface of the bobbin 23 and the inner peripheral surface of the upper portion of the casing 16 are maintained. It is possible to prevent liquid or the like from entering the inner peripheral portion 23 b of the bobbin 23 from the outside through the small screw 18. In FIG. 11, the same components in the example shown in FIG. 1 are denoted by the same reference numerals, and redundant description thereof is omitted.

10, 40 Valve body part 16, 36, 56 Casing 20, 50, 60 Coil part 21, 21 ', 51, 51', 61 Bobbin 30, 31 O-ring 27, 62 Packing 65 Film

Claims (4)

A plunger unit that has an inlet port connected to the first passage and an outlet port connected to the second passage, communicates with the inlet port and the outlet port, and can move a plunger unit that controls opening and closing of the outlet port. A valve main body provided with an accommodating portion for accommodating in,
A bobbin having an inner peripheral part into which the accommodating part of the valve main body part is detachably inserted and holding the coil part; a casing accommodating the coil part and the bobbin; and a step part of the inner peripheral part of the bobbin or the A seal member that seals a gap between the outer peripheral portion of the accommodating portion of the valve main body portion and the inner peripheral portion of the bobbin provided between the upper end surface of the bobbin and the inner peripheral portion of the casing; An electromagnetic coil assembly for performing an operation for controlling opening and closing of the outlet port;
A solenoid valve comprising the above.   The casing has a cylindrical portion that forms a part of the inner peripheral portion of the bobbin, and the sealing member is disposed on the inner peripheral portion of the bobbin adjacent to an end portion of the cylindrical portion of the casing. The solenoid valve according to claim 1, characterized in that:   The seal member is arranged on the periphery of the end portion of the accommodating portion of the valve body portion that contacts the inner peripheral surface of the casing and on the inner peripheral portion of the bobbin adjacent to the end portion of the cylindrical portion of the casing. The electromagnetic valve according to claim 2, wherein   Between the upper end surface of the bobbin and the inner peripheral surface of the upper portion of the casing, there is a sealing convex portion or a sealing concave portion that seals a gap between the upper end surface of the bobbin and the inner peripheral surface of the upper portion of the casing. The electromagnetic valve according to claim 1, further formed.