JP2013228000A - Motor-operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-operated valve having a simple waterproof structure and whirl-stop structure between a can and a coil unit.SOLUTION: A motor-operated valve 1 includes a driving mechanism of a valve stem 40 using a rotor 70, in a can 60 fixed to an upper part of a valve body 10. The coil unit 100 is detachably fitted to the outside of the can 60. A coil 120 and a stator yoke 122 are integrally formed with a resin mold 110. A whirl-stop member 130 is fixed to a lower part of the resin mold 110 by a welding part 112. The waterproof structure is formed by inserting a seal member 140 into the whirl-stop member 130. Whirl-stop is constituted between a leg part 150 of the whirl-stop member 130 and a pipe 14 fixed to the valve body 10.

Description

  The present invention relates to an electric valve used for controlling the flow rate of refrigerant in a refrigeration cycle.

A motor-operated valve used for controlling the flow rate of the refrigerant circulating in the refrigeration cycle integrally connects a stainless steel sealed container called a can to the upper part of a valve body provided with a valve mechanism, and constitutes a motor inside the can. Contains the rotor. The rotation of the rotor is converted into a rectilinear motion by a screw mechanism, for example, and the opening degree of the valve body is manipulated.
A coil unit that constitutes the stator of the motor is detachably fitted on the outside of the can.

JP 2009-287663 A

  The coil unit has a structure in which a stator yoke around which a coil is wound is molded with resin. This resin mold is designed to surround the yoke so that moisture and the like do not enter the coil, but the magnetic teeth between the rotor and the magnetic pole teeth provided on the yoke have a minimum magnetic gap. Only the surface of is exposed.

  The can is made of stainless steel, which is a nonmagnetic steel material, and the stator yoke is made of an electromagnetic steel plate. The electromagnetic steel sheet for the stator yoke is galvanized to prevent corrosion. Therefore, when moisture enters the gap between the can and the stator yoke (the magnetic pole teeth), a potential difference is generated between the two, causing corrosion due to the potential difference. Moreover, when the water which infiltrated contains salt, it rusts and causes corrosion similarly. This corrosion significantly reduces the life of the motor-operated valve.

  When the motor-operated valve is used in an indoor refrigeration cycle, there is little risk of moisture entering between the can and the coil unit. However, when the motor-operated valve is used in a refrigeration cycle such as a vehicle or ship, the can and can It is necessary to provide a seal structure between the coil units to be fitted to the.

The electric valve of Patent Document 1 includes a seal member such as an O-ring on the outer peripheral portion of the valve body. In this structure, the valve body is enlarged and the coil unit is also in contact with the O-ring. Since it is necessary, the size of the valve is increased, and the valve body and the coil unit cannot be configured in common with the motor-driven valve for indoor use, resulting in a problem that the yield is poor.
The object of the present invention is to provide a motor-operated valve that eliminates the above-mentioned disadvantages.

  In order to achieve the above-described object, the motor-operated valve of the present invention is supported by a valve body having a valve chamber, a cylindrical can fixed to the upper part of the valve body, and a rotatable inside the can. A rotor, a conversion mechanism that converts the rotational motion of the rotor into a linear motion and drives a valve shaft that is inserted into the valve chamber, a stator yoke and a coil that are detachably fitted to the outside of the can are integrally formed. A coil unit having a resin mold, and an annular plate member attached to the lower end of the resin mold, and a seal member that is supported by the plate member and forms a waterproof structure between the can.

The plate member is preferably a detent member that fixes the valve body and the coil unit.
In this case, the plate member may include a pair of legs that engage with the valve body.

The plate member may include an extension for screwing the coil unit to the valve body.
The plate member may be a resin plate and may be attached to a lower end portion of the resin mold.

Further, a vent hole is formed at the top of the resin mold, and a sealing member for sealing the vent hole can be provided at the top of the can.
Furthermore, a vent hole is formed at the top of the resin mold, and a sealing plug for sealing the vent hole after the coil unit is mounted can be provided.
Further, the sealing plug may be made of an elastic material so that a tip thereof has a large diameter portion larger than the inner diameter of the vent hole.

Since the motor-operated valve of the present invention includes the above-described means, it is possible to reliably achieve waterproofing between the detachable coil unit and the can and to improve work efficiency when the coil unit is fitted. Further, the configuration of the valve main body can be made common with that of the electric valve applied to the indoor refrigeration cycle that does not require a seal member.
Further, if the sealing member is fixed to the coil unit, the sealing member fixing means is not particularly required, and the structure is simplified.

The longitudinal cross-sectional view of the motor operated valve of the 1st Example of this invention. The longitudinal cross-sectional view of the motor operated valve of the 2nd Example of this invention. The longitudinal cross-sectional view of the motor operated valve of the 3rd Example of this invention. The longitudinal cross-sectional view of the motor operated valve of the 4th Example of this invention. The longitudinal cross-sectional view of the motor operated valve of the 5th Example of this invention.

FIG. 1 is a longitudinal sectional view of an electric valve according to a first embodiment of the present invention.
The motor-operated valve 1 has a valve body 10, and two pipes 20 and 22 are connected to a valve chamber 30 provided in the valve body 10.
A valve seat 32 is formed in the direction in which the valve shaft 40 of the valve chamber 30 advances and retracts. The valve shaft 40 is separated from the valve seat 32 to control the flow rate. A mounting plate 12 is fixed to the upper part of the valve body 10 and a valve shaft guide member 50 is attached. A male screw portion 52 is formed on the outer peripheral portion of the valve shaft guide member 50.

  A can 60 is fixed to the mounting plate 12. The can 60 is made of a nonmagnetic material such as stainless steel. A rotor 70 is disposed inside the can 60, and the rotor 70 is connected to a female screw member 72 via a connecting member 71. The female screw member 72 has a female screw portion 74 and is screwed into the male screw portion 52 of the valve shaft guide member 50.

  When the rotor 70 rotates, the female screw member 72 also rotates, and the rotor 70 moves up and down by the screw action of the conversion mechanism constituted by the male screw portion 52 and the female screw portion 74. A pipe member 80 is press-fitted into the top of the valve shaft 40 that protrudes upward through the female screw member 72. A ring member 82 is fitted on the valve shaft 40 inside the female screw member 72, and the ring member 82 is urged upward by a compression spring 84.

  With this configuration, when the rotor 70 rotates, the valve shaft 40 moves up and down together with the female screw member 72. The movable stopper 76 press-fitted outside the female screw member 72 rotates and moves up and down integrally with the female screw member 72, and the fixed stopper 54 is fixed to the outer side of the valve shaft guide member 50. When the movable stopper 76 abuts against the fixed stopper 54, the rotation of the rotor 70 is forcibly stopped even when the excitation to the stator is continued, and the lowered position of the valve shaft 40 is restricted.

  A cushion spring 90 is attached to the outside of the pipe member 80, and even if the female screw member 72 is lifted by the elastic force of the cushion spring 90 and the female screw portion 74 is detached from the male screw portion 52 of the valve shaft guide member 50, the female screw When the member 72 is lowered, both are screwed again.

A coil unit (stator) 100 is detachably fitted on the outside of the can 60. In the coil unit 100, a coil 120 and a stator yoke 122 are integrally formed in a resin mold 110. That is, the coil 120 is disposed in the stator yoke 122 while being wound around the bobbin, and the coil unit 100 is formed by being resin molded 110. A plurality of magnetic pole teeth are formed on the stator yoke 122 so as to face the can 60, and the resin mold 110 is formed except for the surface of the magnetic pole teeth that faces the can 60. In other words, the surface of the magnetic pole tooth facing the can 60 is exposed inside the coil unit 100.
The stator yoke 122 is made of an electromagnetic steel plate and is galvanized or the like for corrosion prevention.

  The anti-rotation member 130 is a plate member for positioning and fixing the coil unit 100 to the valve body 10, and a seal member 140 such as an O-ring, which will be described later, is placed below the resin mold 110 (in this embodiment, a stator yoke). 122 is fixed to the lower end portion of the resin mold 110 in a state of being sandwiched with the lower surface of the inner peripheral portion 122.

  The anti-rotation member 130 is a ring-shaped (annular) metal member having, for example, four holes on the circumference, and after inserting a columnar portion provided on the lower surface of the resin mold 110 into the hole. The columnar portion is melted to form the welded portion 112, thereby being fixed to the resin mold 110.

  The leg portion 150 of the anti-rotation member 130 thus attached to the coil unit 100 is composed of a pair of elastic legs, and the pair of elastic legs is elastically engaged with the outer periphery of the pipe 14 fitted and fixed to the side surface of the valve body 10. By combining, the coil unit 100 is positioned and fixed with respect to the valve body 10.

  The seal member 140 provided between the rotation prevention member 130 and the stator yoke 122 is crimped to the outer periphery of the can 60 when the coil unit 100 is fitted to the can 60 from the upper part of the can 60, thereby Intrusion of moisture between 60 and the coil unit 100 is prevented.

The leg 150 can be configured to be bent integrally with the anti-rotation member 130, but may be separated from the anti-rotation member 130 and attached to the anti-rotation member 130 by welding or the like.
With the above configuration, moisture does not enter between the can 60 and the stator yoke 122, and the insulation performance deteriorates even when the motor-operated valve 1 is placed in an environment where it is used outdoors such as a vehicle or a ship. There is nothing. In addition, since the seal member 140 is fixed to the resin mold 110 using the anti-rotation member 130 for fixing the coil unit 100 to the valve body 10, no particular means for fixing the seal member 140 is required, and the seal member 140 is not required. The valve main body can be shared with the motor-operated valve for an indoor refrigeration cycle that does not particularly require the valve, and the yield of the motor-operated valve is not reduced.

FIG. 2 is an explanatory diagram of the second embodiment of the present invention.
Since the main configuration of the motor-operated valve 1a is the same as the configuration described in FIG. 1, the same members are denoted by the same reference numerals, and detailed description thereof is omitted.

Also in this embodiment, the seal member 140 is sandwiched between the anti-rotation member and the lower surface of the inner peripheral portion of the stator yoke 122 and is fixed to the coil unit 100 in the same manner as in the previous embodiment.
In this embodiment, instead of providing the pair of legs 150 (FIG. 1) on the anti-rotation member, an extension 132 extending in the direction of the valve body 10 is provided inside the anti-rotation member. The extension portion 132 of the rotation preventing member 131 is fixed to the valve body 10 with a screw 134 to constitute a rotation preventing structure for the coil unit 100.

FIG. 3 is an explanatory diagram of the third embodiment of the present invention.
Since the main configuration of the motor-operated valve 1b is the same as the configuration described in FIG. 1, the same members are denoted by the same reference numerals, and detailed description thereof is omitted. The third embodiment is a modification of the first embodiment.

  In the present embodiment, in contrast to the first embodiment, a vent hole 160 is further provided at the top of the resin mold 110, and a packing 170 is disposed between the top of the resin mold 110 and the can 60.

In the first embodiment, in order to improve the adhesion between the seal member 140 and the can 60, the can 60 is closed by the seal member 140 when the coil unit 100 is fitted to the outside of the can 60. The sealing degree of the space between the side surface and the inside of the resin mold 110 becomes high, and the assembly work for fitting the coil unit 100 to the can 60 may be difficult.
Therefore, in this embodiment, the vent hole 160 is formed at the top of the resin mold 110 to form the air vent, and this assembling work is facilitated.

  A packing 170 is attached in advance to the top of the can 60 facing the vent hole 160 by means such as adhesion. The assembly operation for fitting the coil unit 100 to the can 60 is completed, and the pair of leg portions 150 of the rotation preventing member 130 is fixed to the outer periphery of the pipe 14 fitted and fixed to the side surface of the valve main body 10. When positioned on the main body 10, the packing 170 seals the vent hole 160 to prevent moisture from entering the resin mold 110 from the vent hole 160.

As described above, in this embodiment, the assembling work for fitting the coil unit 100 to the can 60 is facilitated, and the vent hole 160 is automatically closed when the fitting work is completed. No special work is required.
Such a structure using the air holes 160 and the packing 170 may be applied to the second embodiment shown in FIG.

FIG. 4 is an explanatory view showing a fourth embodiment of the present invention.
Since the main configuration of the motor-operated valve 1c is the same as the configuration described in FIG. 1, the same members are denoted by the same reference numerals, and detailed description thereof is omitted. The fourth embodiment is a modification of the third embodiment.

  Even in this embodiment, the vent hole 160 is provided at the top of the resin mold 110 as in the motor-operated valve 1b of the third embodiment.

  The function of the vent hole 160 is the same as that of the electric valve 1b. In the present embodiment, the coil unit 100 is fitted into the can 60 and the vent hole 160 is sealed with the sealing plug 180 after assembly. In this example, the sealing plug 180 is made of an elastic material such as rubber so that the tip thereof has a large diameter portion 180a having a diameter larger than the inner diameter of the vent hole 160, and the large diameter portion 180a is contracted. It is inserted into the vent hole 160 so as to have a diameter, and after the insertion is completed, the large diameter portion 180a returns to the original state so that the sealing plug 180 is attached to the vent hole 160.

By using this sealing plug 180, the vent hole 160 can be closed.
Such a structure using the vent hole 160 and the sealing plug 180 may be applied to the second embodiment shown in FIG.
The sealing plug may be formed of a resin or metal so that the tip does not have a large diameter portion, and after being attached to the vent hole 160, the sealing plug may be fixed to the resin mold 110 by a technique such as welding or adhesion.

FIG. 5 is an explanatory diagram showing a fifth embodiment of the present embodiment.
Since the main configuration of the motor-operated valve 1d is the same as the configuration described in FIG. 1, the same members are denoted by the same reference numerals, and detailed description thereof is omitted. The fifth embodiment is a modification of the first embodiment.

  In the motor operated valve 1d of the present embodiment, a resin plate (plate member) 200 is provided as a structure for supporting the seal member 140 under the resin mold 110.

The resin plate 200 is fixed to the resin mold 110 by a technique such as ultrasonic welding or adhesion using an adhesive. In this example, since the resin plate 200 does not have a function (position prevention function) for positioning and fixing the coil unit 100 with respect to the valve body 10, if this function is necessary, a separate appropriate Positioning and fixing means are provided in the manner.
However, when both the coil unit 100 and the valve body 10 are fixed to, for example, a component (not shown) constituting the refrigeration cycle in which the motor-operated valve 1d is provided, the coil unit 100 is positioned and fixed with respect to the valve body 10. No special function is required.

By adopting this structure, the structure can be simplified and the cost can be reduced.
In contrast to the fifth embodiment, the vent hole 160 and the packing 170 or the sealing plug 180 described in the third or fourth embodiment may be provided.

  By providing the motor-driven valve of the present invention with the above configuration, a waterproof structure between the coil units that are detachably fitted to the can can be realized with a very simple structure, and the structure of the valve body 10 is a seal. The member 140 can be shared with a valve body of an electric valve for an indoor refrigeration cycle that does not particularly require.

1, 1a, 1b, 1c, 1d Motorized valve 10 Valve body 12 Mounting plate 14 Pipe 20, 22 Piping 30 Valve chamber 32 Valve seat 40 Valve shaft 50 Valve shaft guide member 52 Male thread portion 54 Fixed stopper 60 Can 70 Rotor 71 Connecting member 72 Female thread member 74 Female thread part 76 Movable stopper 80 Pipe member 82 Ring member 84 Compression spring 90 Cushion spring 100 Coil unit 110 Resin mold 112 Welding part 120 Coil 122 Stator yoke 130, 131 Non-rotating member (plate member)
132 Extension part 134 Screw 140 Seal member 150 Leg part 160 Vent hole 170 Packing 180 Seal plug 200 Resin plate (plate member)

Claims (8)

A valve body having a valve chamber, a cylindrical can fixed to the upper portion of the valve body, a rotor rotatably supported in the can, and a rotary motion of the rotor converted into a linear motion A motorized valve comprising a conversion mechanism for driving a valve shaft inserted into the chamber, a stator yoke detachably fitted on the outside of the can, and a coil unit having a resin mold integrally formed with a coil;
An annular plate member attached to the lower end of the resin mold;
A motor-operated valve comprising: a seal member supported by the plate member and constituting a waterproof structure between the coil unit and the can.   The motor-operated valve according to claim 1, wherein the plate member is a detent member that fixes the valve main body and the coil unit.   The motor-operated valve according to claim 2, wherein the plate member includes a pair of legs that engage with the valve body.   The motor-operated valve according to claim 2, wherein the plate member includes an extension for screwing the coil unit to the valve body.   The motor-operated valve according to claim 1, wherein the plate member is a resin plate and is attached to a lower end portion of a resin mold.   The motor-operated valve according to any one of claims 1 to 5, wherein a vent hole is formed at a top portion of the resin mold, and a sealing member for sealing the vent hole is provided at a top portion of the can.   The motor-operated valve according to any one of claims 1 to 5, wherein a vent hole is formed at a top portion of the resin mold, and a sealing plug is provided for sealing the vent hole after the coil unit is mounted.   The motor-operated valve according to claim 7, wherein the sealing plug is made of an elastic material so that a tip has a large diameter portion larger than an inner diameter of the vent hole.