JP6523200B2 - Motorized valve - Google Patents

Description

  The present invention relates to a motor operated valve used in a refrigeration cycle or the like.

  BACKGROUND ART Conventionally, a flow control valve used for a large package air conditioner or a refrigerator is known (see, for example, Patent Document 1). In this flow control valve, large operability and good operability can be achieved even when a large pressure difference occurs, from the background of control device rationalization such as combining multiple motorized valves used for flow control into one. Performance that can be exhibited is desirable, but relatively large-diameter flow control has a large load on the valve body generated by the pressure difference relative to the thrust of the screw generated by the torque of the magnet and a large drive to operate the valve body Power is required.

  Therefore, in order to improve the operability of the valve body, a structure as described below is employed. For example, in the flow control valve 101 shown in FIG. 6, the seal member 137 is mounted on the valve body 120 slidingly contacting the inner peripheral surface of the cylindrical holding member 114 to define the back pressure chamber 129 above the valve chamber 107. At the same time, the pressure in the valve port 119 is introduced into the back pressure chamber 129 via the conduction path 124 provided in the valve body 120, and the pressure (back pressure) in the back pressure chamber 129 is used to close the valve. Cancel the force due to the pressure difference between the push-down force (force acting in the valve-closing direction) and the push-up force (force acting in the valve-opening direction) in the valve state to reduce the load on the valve There is.

  In this flow control valve, it is necessary to assemble the valve shaft holder 106, the cylindrical holding member 114, and the valve body 130 with high accuracy in order to prevent valve leakage and improve the durability. As for the necessity of assembling the valve shaft holder 106, the cylindrical holding member 114, and the valve main body 130 with high accuracy, even if it is a flow control valve adopting a method other than the method of canceling the force due to the pressure difference. Required

JP, 2014-35006, A

  By the way, in the flow control valve described above, when assembling the valve shaft holder 106 to the cylindrical holding member 114, as shown in FIG. 7A (within the circle F in FIG. 6), the flange portion 106f is cylindrically held. After centering by engaging with the step portion 114a formed at the upper end of the member 114, the flange portion 106f and the upper end of the cylindrical holding member 114 are fixed by welding. In this case, in order to ensure the concentricity of the valve shaft holder 106 and the cylindrical holding member 114, dimensional tolerance with high accuracy is required, and also assembly accuracy is required.

Similarly, when the cylindrical holding member 114 is assembled to the valve main body 130, as shown in FIG. 7B (within the circle G in FIG. 6), the stepped portion 114b formed in the cylindrical holding member 114 The tubular holding member 114 and the valve main body 130 are fixed by brazing while engaging the step portion 130a formed in the main body 130 and securing airtightness and pressure resistance. Also in this case, in order to ensure the concentricity of the cylindrical holding member 114 and the valve main body 130 at the time of assembly, dimensional tolerance with high accuracy is required.
An object of the present invention is to provide a motor-operated valve capable of easily ensuring concentricity between members.

The motor operated valve of the present invention for achieving the above object is
The rotational movement of the rotor is converted into a linear movement by the screw connection between the male screw member and the female screw member, and based on this linear movement, the valve body accommodated in the valve body is axially guided by the guide of the valve body guiding member. It is a motorized valve to be moved,
The rotor is disposed in a cylindrical cup-shaped case made of nonmagnetic material,
The valve body has a valve chamber therein;
The valve body guiding member is a cylindrical body including a small diameter portion located in the valve chamber, and a large diameter portion having an inner diameter larger than the small diameter portion and located closer to the rotor than the small diameter portion.
The female screw member is press-fit into the large diameter portion of the valve body guide member and assembled .
The female screw formed on the inner periphery of the female screw member is located in the case, and the valve body is guided to the small diameter portion of the valve body guiding member in the valve chamber .
As a result, when assembling the motor-operated valve, concentricity between the members can be easily secured easily without high assembling accuracy.

Moreover, the motor operated valve of the present invention is
Furthermore, the valve body guide member is press-fit into and assembled with the valve body.
Thereby, when assembling the motor-operated valve, the concentricity of the valve body, the valve body guide member, and the female screw member (valve shaft holder) can be easily ensured, and the valve body, the valve body guide member, and the female Positioning and fixation of the screw member (valve shaft holder) can be accurately performed.

Moreover, the motor operated valve of the present invention is
By providing a step on the valve body guide member, a first press-fit portion and a second press-fit portion whose diameter is smaller than that of the first press-fit portion are formed in the valve body guide member.
The valve body guide member is assembled to the valve body by pressing the first press-fit portion into the valve body;
The female screw member is press-fit into the second press-fit portion of the valve body guide member and assembled to the valve body.

  Thus, by forming a step on the valve body guide member, spaces are formed between the first press-fit portion and the female screw member (valve shaft holder) and between the second press-fit portion and the valve body, respectively. The valve body guiding member can be elastically deformed in the radial direction. For this reason, the valve body guide member can be smoothly pressed into the valve body, and the female screw member (valve shaft holder) can be smoothly pressed into the valve body guide member, so that the motorized valve can be easily assembled. Further, by providing a step on the valve guide member to form a space, even if the valve guide member or the female screw member (valve shaft holder) is inclined in the process of press-fitting, the valve guide member is in the radial direction Because of elastic deformation, the valve body guide member and the female screw member (valve shaft holder) are not assembled while being inclined, and the concentricity of the valve body, the valve body guide member, and the female screw member (valve shaft holder) Can be accurately secured.

  According to the motor-operated valve of the present invention, concentricity between members can be easily ensured.

It is sectional drawing of the motor operated valve which concerns on 1st Embodiment. It is a figure which shows the structure of the valve-shaft holder (female screw member) of the motor operated valve which concerns on 1st Embodiment. It is a principal part expanded sectional view of the motor-operated valve shown in FIG. It is sectional drawing of the motor operated valve which concerns on 2nd Embodiment. It is a principal part expanded sectional view of the motor-operated valve shown in FIG. It is sectional drawing of the conventional flow control valve currently disclosed by Unexamined-Japanese-Patent No. 2014-35006. It is a principal part expanded sectional view of the conventional flow control valve shown in FIG.

  Hereinafter, a motor-operated valve according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the motor operated valve 2 according to the first embodiment. In the present specification, "upper" or "lower" is defined in the state of FIG. That is, the rotor 4 is located above the valve body 17.

In the motor-operated valve 2, a valve main body 30 is integrally connected by welding or the like to the lower side of the opening side of a case 60 having a cylindrical cup shape made of nonmagnetic material.
Here, the valve main body 30 is a press-formed product manufactured by pressing a metal material such as a stainless steel plate or the like, and has a valve chamber 11 inside. Further, a stainless steel or copper first pipe joint 12 directly communicating with the valve chamber 11 is fixedly attached to the valve body 30. Further, a valve seat member 30A in which a valve port 16 having a circular cross section is formed is incorporated in the lower side of the valve body 30. A stainless steel or copper second pipe joint 15 communicating with the valve chamber 11 through the valve port 16 is fixedly attached to the valve seat member 30A.

  The rotatable rotor 4 is accommodated on the inner periphery of the case 60, and a valve shaft 41 is disposed on an axial center portion of the rotor 4 via a bush member 33. The valve shaft 41 and the rotor 4 coupled by the bush member 33 integrally move in the vertical direction while rotating. An external thread 41 a is formed on the outer peripheral surface near the middle portion of the valve shaft 41. In the present embodiment, the valve shaft 41 functions as a male screw member.

On the outer periphery of the case 60, a stator formed of a yoke, a bobbin, a coil, and the like (not shown) is disposed, and a stepping motor is configured by the rotor 4 and the stator.
A guide support 52 is fixed to the ceiling surface of the case 60. The guide support 52 has a cylindrical portion 53 and an umbrella-like portion 54 formed on the upper end side of the cylindrical portion 53, and the whole is integrally molded by press processing. The umbrella-like portion 54 is molded in substantially the same shape as the top inner side of the case 60.

  A cylindrical member 65 which also serves as a guide for the valve shaft 41 is fitted in the cylindrical portion 53 of the guide support 52. The cylindrical member 65 is made of a lubricant-containing material or a surface-treated member made of metal or synthetic resin, and rotatably holds the valve shaft 41.

  Below the bush member 33 of the valve shaft 41, as will be described later, the valve shaft holder 6 which forms a screw connection A with the valve shaft 41 and has a function of suppressing the inclination of the valve shaft 41 It is fixed non-rotatably relatively to.

  FIG. 2 is a view showing the structure of the valve stem holder 6. Here, FIG. 2 (a) is a side view of the valve shaft holder 6, and FIG. 2 (b) is a top view of the valve shaft holder 6 as viewed from above. Moreover, FIG.2 (c) is the bottom view which looked at this from the downward direction, and FIG.2 (d) is AA sectional drawing of FIG.2 (b).

  As shown in FIG. 2, the valve shaft holder 6 is fitted with the upper cylindrical portion 6 a, the lower cylindrical portion 6 b, and the fitting portion 6 c accommodated on the inner peripheral side of the valve body 30. It is a member which consists of the flange part 6f which protruded from the joint part 6c. Here, the cylindrical small diameter portion 6a, the cylindrical large diameter portion 6b, and the fitting portion 6c are formed of, for example, a resin material such as PPS (polyphenylene sulfide) resin, and the flange portion 6f is a metal such as stainless steel. It is formed.

Further, as shown in FIG. 2 (a), (c) , (d), the fitting portion 6c, the protruding portion 6c1 is provided projecting in four directions of the outer periphery. Furthermore, the maximum outer diameter of the fitting portion 6c formed by the outer wall surface of the projecting portion 6c1 is formed so as not to be smaller than the diameter on the inner peripheral surface side of the large diameter portion 72a of the valve guide member 72. . For this reason, when the valve stem holder 6 is press-fit into the valve body guide member 72, the projecting portion 6c1 of the valve stem holder 6 can be closely engaged with the inner peripheral surface of the large diameter portion 72a of the valve body guide member 72. The valve shaft holder 6 can be prevented from moving relative to the valve body guide member 72. In addition, the flange portion 6f has a ring shape that surrounds the lower end of the cylindrical large diameter portion 6b.

  Further, a female screw 6d is formed downward from the upper opening 6g of the cylindrical small diameter portion 6a of the valve shaft holder 6 to a predetermined depth. For this reason, in the present embodiment, the valve shaft holder 6 functions as a female screw member. A screw connection A shown in FIG. 1 is configured by the male screw 41a formed on the outer periphery of the valve stem 41 and the female screw 6d formed on the inner periphery of the cylindrical small diameter portion 6a of the valve stem holder 6. There is.

  Furthermore, a storage chamber 6 h for storing the valve guide 18 is formed in the valve shaft holder 6. Further, a pressure equalizing hole 51 is bored in the side surface of the cylindrical large diameter portion 6b of the valve shaft holder 6, and the pressure equalizing hole 51 allows the valve in the cylindrical large diameter portion 6b as shown in FIG. The shaft holder chamber 83 and the rotor accommodation chamber 67 (second back pressure chamber) communicate with each other. By providing the pressure equalizing hole 51 in this manner, the space between the rotor 4 of the case 60 and the space in the valve shaft holder 6 can be communicated with each other to smoothly move the valve shaft holder 6. it can.

  Further, below the valve shaft 41, a cylindrical valve guide 18 is disposed slidably with respect to the storage chamber 6h of the valve shaft holder 6. The valve guide 18 is bent at substantially the right angle by press molding on the ceiling 21 side. A through hole 18 a is formed in the ceiling portion 21. Further, a flange portion 41 b is further formed below the valve shaft 41.

Here, the valve shaft 41 is loosely inserted into the through hole 18 a of the valve guide 18 so as to be rotatable and radially displaceable with respect to the valve guide 18, and the flange portion 41 b is a valve It is disposed within the valve guide 18 so as to be rotatable and radially displaceable with respect to the guide 18. Further, the valve shaft 41 is inserted through the through hole 18 a, and the top surface of the flange portion 41 b is disposed to face the ceiling portion 21 of the valve guide 18. In addition, the valve stem 41 is prevented from coming off by making the collar portion 41 b larger in diameter than the through hole 18 a of the valve guide 18.

  Since the valve shaft 41 and the valve guide 18 can move in the radial direction with respect to each other, the valve guide 18 and the valve shaft 41 can be obtained without requiring a high degree of concentric mounting accuracy with respect to the arrangement position of the valve shaft holder 6 and the valve shaft 41. The concentricity with the valve body 17 is obtained.

Between the ceiling portion 21 of the valve guide 18 and the flange portion 41 b of the valve shaft 41, a washer 70 having a through hole formed in the central portion is installed. The washer 70 is preferably a metal washer with a high lubricity surface, a high lubricity resin washer such as fluorocarbon resin, or a metal washer with a high lubricity resin coating.
Furthermore, in the valve guide 18, the compressed valve spring 27 and the spring receiver 35 are accommodated.

  Further, a valve body guide member 72 for guiding the axial movement of the valve body 17 is disposed inside the valve body 30, and a seal member 48 is provided between the valve body 17 and the valve body guide member 72. It is interspersed.

  Here, in the valve body 17, a hole 17 b in the longitudinal direction and a conduction hole 17 c in the lateral direction are formed as a pressure equalizing path. The pressure of the valve port 16 (in the second pipe joint 15) is led to the back pressure chamber 28 through the hole portion 17b, which is a pressure equalizing path, and the conduction hole 17c.

  The valve body guide member 72 is a cylindrical body which the inside penetrates, and has a flange portion 72c located at the uppermost position, a large diameter portion 72a below the flange portion 72c, and a small diameter portion 72b below the flange portion 72c. And the like are formed by press-forming a metal material such as Further, the diameter on the outer peripheral surface side of the large diameter portion 72 a of the valve body guide member 72 is formed to be slightly larger than the diameter on the inner peripheral surface side of the valve main body 30. For this reason, when the valve body guide member 72 is press-fit into the valve body 30, the large diameter portion 72a of the valve body guide member 72 can be closely engaged with the inner peripheral surface of the valve body 30, and the valve body guide member 72 It can be prevented from moving relative to the valve body 30.

  The seal member 48 is an annular member formed by sandwiching an annular reinforcing plate 48 b between annular packings 48 a having an L-shaped cross section. In the sealing member 48, a plate spring is disposed for always urging the annular packing 48a outward on the upper side of the annular packing 48a arranged on the upper side and the lower side of the annular packing 48a arranged on the lower side. Is preferred.

  Next, the main part of the motor operated valve 2 in the first embodiment will be described. FIG. 3 is an enlarged cross-sectional view of the main part of the motor-operated valve 2 according to the first embodiment. As shown in FIG. 3, in the motor-operated valve 2, the valve shaft holder 6, the valve body guide member 72, and the valve main body 30 are respectively constituted by independent members.

  Here, when assembling the motor-operated valve 2, first, the valve body guiding member 72 is pressed into the valve main body 30 with the outer peripheral surface of the large diameter portion 72 a contacting the inner peripheral surface of the valve main body 30. Further, the valve shaft holder 6 brings the projecting portion 6c1 projecting from the outer periphery of the fitting portion 6c into contact with the inner peripheral surface of the large diameter portion 72a of the valve body guiding member 72 and is press-fit into the valve body guiding member 72. After press-fitting, welding is performed in a state in which the lower surface of the flange portion 6f of the valve shaft holder 6, the upper end portion of the valve main body 30, and the flange portion 72c of the valve body guide member 72 are integrally sealed by welding. It is fixed.

  As described above, when the outer peripheral surface of the large diameter portion 72a of the valve guide member 72 is brought into contact with the inner peripheral surface of the valve main body 30 to press the valve guide member 72 into the valve main body 30, the valve guide member 72 Since the valve body 30 can be closely locked, the valve body guide member 72 is naturally disposed at a position concentric with the valve body 30. Similarly, when the valve shaft holder 6 is pressed into the valve body guide member 72 by bringing the projecting portion 6c1 of the valve shaft holder 6 into contact with the inner peripheral surface of the large diameter portion 72a of the valve body guide member 72, the valve shaft holder 6 The valve stem holder 6 is naturally disposed concentrically with the valve guide member 72, since the protrusion 6c1 of the valve body guide member 72 can be closely engaged.

Therefore, according to the invention of the first embodiment, when assembling the motor-operated valve 2, the valve main body 30, the valve body guiding member 72, and the valve shaft holder 6 can be easily obtained even if there is no high assembling accuracy. The concentricity can be secured, and the valve body 30, the valve body guide member 72, and the valve shaft holder 6 can be accurately positioned and fixed. For this reason, it is not necessary to use a jig etc. in order to secure concentricity. Further, by tightly locking the valve body guide member 72 to the valve body 30 , the first chamber 26 formed outward of the valve body 17, the valve body 17 and the valve shaft holder 6 are formed. Since the space between the first chamber 26 and the back pressure chamber 28 is reliably sealed, pressure leakage between the first chamber 26 and the back pressure chamber 28 can be prevented.

  Next, a motor-operated valve according to a second embodiment will be described with reference to the drawings. In the motor-operated valve according to the second embodiment, a step is provided on the valve body guide member 72 in the first embodiment. Therefore, the description of the same configuration as that of the first embodiment is omitted, and only different portions will be described.

  FIG. 4 is a cross-sectional view of the motor-operated valve according to the second embodiment. As shown in FIG. 4, the valve body guide member 72 is provided with a large diameter portion 72a, a small diameter portion 72b below, and a flange portion 72c. Further, in the large diameter portion 72a, a step 74 is formed over the entire circumference. FIG. 5 is an enlarged cross-sectional view of the vicinity of the step 74 which is a main part of the motor operated valve 202. As shown in FIG. As shown in FIG. 5, the large diameter portion 72 a of the valve body guiding member 72 is configured to change in diameter with the step 74 as a boundary, and the first press-fit portion 75 formed above the step 74 and the lower side of the step 74 The second press-in portion 76 is smaller in diameter than the first press-in portion 75 formed in the above. By forming the step 74 in the large diameter portion 72a of the valve body guide member 72 in this manner, a space 82 is formed between the first press-fit portion 75 and the valve shaft holder 6, and the second press-fit portion 76 is formed. A space 84 is formed between the valve body 30 and the valve body 30. For this reason, the valve body guide member 72 can be elastically deformed in the radial direction.

  Further, since the diameter on the outer peripheral surface side of the first press-fit portion 75 is formed slightly larger than the diameter on the inner peripheral surface side of the valve main body 30, when the valve body guide member 72 is press-fit into the valve main body 30, The portion 75 is tightly locked to the inner circumferential surface of the valve body 30. Similarly, the maximum outer diameter of the fitting portion 6c of the valve shaft holder 6 formed by the outer wall surface of the protruding portion 6c1 is formed so as not to be smaller than the diameter on the inner peripheral surface side of the second press-fit portion 76 Therefore, when the valve stem holder 6 is press-fit into the valve body guide member 72, the projecting portion 6c1 of the valve stem holder 6 is closely engaged with the inner circumferential surface of the second press-fit portion 76.

  Here, when assembling the motor-operated valve 202, the valve body guiding member 72 is press-fitted to the valve body 30 by bringing the outer circumferential surface of the first press-fit portion 75 of the large diameter portion 72a into contact with the inner circumferential surface of the valve body 30. . In this case, since the space 82 is formed between the first press-fit portion 75 and the valve shaft holder 6, the reaction force of the inner peripheral surface of the valve body 30 enables the first press-fit portion 75 to contract radially. As compared with the case where the valve body guide member 72 does not have the step 74, the valve body guide member 72 is press-fitted into the valve body 30 more smoothly.

  Further, the valve shaft holder 6 brings the projecting portion 6c1 protruding from the outer periphery of the fitting portion 6c into contact with the inner peripheral surface of the second press-fit portion 76 of the large diameter portion 72a of the valve body guiding member 72. It is pressed into the In this case, since the space 84 is formed between the second press-fit portion 76 and the valve main body 30, the second press-fit portion 76 can be expanded in the radial direction by the projection 6c1 of the valve shaft holder 6, The holder 6 is pressed into the valve body guide member 72 smoothly.

  After press-fitting, welding is performed in a state in which the lower surface of the flange portion 6f of the valve shaft holder 6, the upper end portion of the valve main body 30, and the flange portion 72c of the valve body guide member 72 are integrally sealed by welding. It is fixed.

  According to the invention of the second embodiment, the large diameter portion 72a is provided with the step 74 to form the space 82 and the space 84, and the valve body guiding member 72 can be elastically deformed in the radial direction. As a result, the valve body guide member 72 and the valve shaft holder 6 can be smoothly pressed into the valve body 30 and the valve body guide member 72, respectively, and the motorized valve 202 can be easily assembled. Further, by providing the space 82 and the space 84 formed by the step 74 on both sides of the valve guide member 72, even if the valve guide member 72 and the valve shaft holder 6 are inclined in the process of press-fitting, the valve Since the guide member 72 elastically deforms in the radial direction, the valve body guide member 72 and the valve shaft holder 6 are not assembled while being inclined, and the valve body 30, the valve body guide member 72, and the valve shaft holder 6 are the same. The coreness can be accurately secured.

  In each of the above-described embodiments, although the case where the hole portion 17b and the conduction hole 17c are provided in the valve body 17 as the pressure equalization path is described as an example, the pressure equalization path is not necessarily provided in the valve body 17. It is not necessary to provide it. For example, instead of providing a pressure equalizing path in the valve body 17, a piping member may be separately provided to guide the pressure of the valve port 16 to the back pressure chamber 28.

  Furthermore, in each of the embodiments described above, the seal member 48 is interposed between the valve body 17 and the valve body guide member 72, and the pressure of the valve port 16 is introduced to the back pressure chamber 28 by the pressure equalizing path. Although the motor-operated valve 2 having the structure for canceling the force due to the pressure acting on the valve body 17 is described as an example, it may be a motor-operated valve having no such structure.

2 Motorized valve 6 Valve shaft holder (female screw member)
6c fitting portion 6c1 protrusion 6d female screw 17 valve body 30 valve main body 41 valve shaft 41a male thread 48 seal member 72 valve member guide member 72a large diameter portion 72b small diameter portion 72c flange portion 74 step difference 75 first press-fit portion 76 second Press fit portion 82 space 84 space

Claims (3)

The rotational movement of the rotor is converted into a linear movement by the screw connection between the male screw member and the female screw member, and based on this linear movement, the valve body accommodated in the valve body is axially guided by the guide of the valve body guiding member. It is a motorized valve to be moved,
The rotor is disposed in a cylindrical cup-shaped case made of nonmagnetic material,
The valve body has a valve chamber therein;
The valve body guiding member is a cylindrical body including a small diameter portion located in the valve chamber, and a large diameter portion having an inner diameter larger than the small diameter portion and located closer to the rotor than the small diameter portion.
The female screw member is press-fit into the large diameter portion of the valve body guide member and assembled .
A motorized valve characterized in that a female screw formed on an inner periphery of the female screw member is located in the case, and the valve body is guided to the small diameter portion of the valve body guiding member in the valve chamber .   The motor-operated valve according to claim 1, wherein the valve body guide member is assembled by press-fitting the valve body. By providing a step on the valve body guide member, a first press-fit portion and a second press-fit portion whose diameter is smaller than that of the first press-fit portion are formed in the valve body guide member.
The valve body guide member is assembled to the valve body by pressing the first press-fit portion into the valve body;
The motor-operated valve according to claim 2, wherein the female screw member is assembled to the valve main body by press-fitting the second press-fit portion of the valve body guiding member.

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