WO2017168943A1

WO2017168943A1 - Motor-operated valve

Info

Publication number: WO2017168943A1
Application number: PCT/JP2017/000964
Authority: WO
Inventors: 珠実田邊; 元康石黒; 雄希北見; 大樹中川
Original assignee: 株式会社鷺宮製作所
Priority date: 2016-03-31
Filing date: 2017-01-13
Publication date: 2017-10-05
Also published as: CN108700217B; JP6523200B2; CN108700217A; JP2017180744A

Abstract

[Problem] To easily ensure concentricity among members. [Solution] A motor-operated valve in which the rotational motion of a rotor is converted into linear motion via the screw coupling of a male screw member and a female screw member, and a valve body housed in a valve main body is moved in the axial direction in accordance with the guidance of a valve body guidance member on the basis of the linear motion. The motor-operated valve is assembled with the female screw member pressed into the valve body guidance member.

Description

Motorized valve

The present invention relates to an electric valve used for a refrigeration cycle or the like.

Conventionally, a flow control valve used for large packaged air conditioners and refrigerators is known (for example, see Patent Document 1). This flow control valve has good operability even when a large diameter and high pressure difference occur because of the rationalization of control equipment such as combining multiple motorized valves used for flow control into one. Performance that can be demonstrated is desired, but the flow control with a relatively large diameter has a large load on the valve body caused by the pressure difference against 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 such a valve body, a structure as described below is adopted. For example, in the flow control valve 101 shown in FIG. 6, the back pressure chamber 129 is defined above the valve chamber 107 by mounting the seal member 137 on the valve body 120 slidably contacting the inner peripheral surface of the cylindrical holding member 114. 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 in the back pressure chamber 129 (back pressure) is used to close the valve. Canceling the force due to the pressure difference between the push-down force (force acting in the valve closing direction) acting on the valve body 120 in the state and the push-up force (force acting in the valve opening direction), and reducing the load on the valve body 120 Yes.

In this flow control valve, it is necessary to assemble the valve shaft holder 106, the cylindrical holding member 114, and the valve main body 130 with high accuracy in order to prevent valve leakage and improve durability. The necessity of assembling the valve shaft holder 106, the cylindrical holding member 114, and the valve main body 130 with high accuracy is the same for a flow control valve that employs 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 above-described flow rate control valve, when the valve shaft holder 106 is assembled to the cylindrical holding member 114, the flange portion 106f is held in the cylindrical shape as shown in FIG. After centering by engaging with a stepped 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 between the valve shaft holder 106 and the cylindrical holding member 114, a high-accuracy dimensional tolerance is required and an assembly accuracy is also required.

Similarly, when assembling the cylindrical holding member 114 to the valve main body 130, as shown in FIG. 7B (inside the circle G in FIG. 6), the stepped portion 114b formed in the cylindrical holding member 114 is provided with a valve. The cylindrical holding member 114 and the valve main body 130 are fixed by brazing while ensuring airtightness and pressure-resistant strength by engaging with a stepped portion 130a formed on the main body 130. Even in this case, in order to ensure concentricity between the cylindrical holding member 114 and the valve main body 130 during assembly, a highly accurate dimensional tolerance is required.
An object of the present invention is to provide an electric valve that can easily ensure concentricity between members.

To achieve the above object, the motor-operated valve of the present invention is
The rotational motion of the rotor is converted into a linear motion by screw connection between the male screw member and the female screw member, and the valve body accommodated in the valve body is axially guided by the valve body guide member based on this linear motion. A motorized valve to be moved,
The female screw member is press-fitted into the valve body guide member and assembled.
Thereby, when assembling the electric valve, the concentricity between the members can be easily ensured even without a high degree of assembly accuracy.

Moreover, the motor operated valve of the present invention is
Furthermore, the valve body guide member is press-fitted into the valve body and assembled.
Thereby, when assembling the electric valve, the concentricity of the valve main body, the valve body guide member, and the female screw member (valve shaft holder) can be easily secured, and the valve main body, the valve body guide member, and the female body can be secured. The screw member (valve shaft holder) is accurately positioned and fixed.

Moreover, the motor operated valve of the present invention is
By providing a step in the valve body guide member, the valve body guide member is formed with a first press-fit portion and a second press-fit portion having a smaller diameter than the first press-fit portion due to the step,
The valve body guide member is assembled to the valve body by press-fitting the first press-fit portion into the valve body;
The female screw member is press-fitted into the second press-fitting portion of the valve element guide member and is assembled to the valve body.

Thus, by forming a step in 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 guide 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 motor-operated valve can be easily assembled. Further, by providing a step in the valve body guide member to form a space, even if the valve body guide member and the female screw member (valve shaft holder) are tilted during the press-fitting process, the valve body guide member is moved in the radial direction. Due to the elastic deformation, the valve body guide member and female screw member (valve shaft holder) are not assembled while being tilted, and the concentricity of the valve body, valve body guide member, and female screw member (valve shaft holder). Can be secured accurately.

According to the electric valve according to the present invention, the concentricity between the 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 electrically 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. FIG. 3 is a cross-sectional view of a conventional flow control valve disclosed in Japanese Patent Laid-Open No. 2014-35006. It is a principal part expanded sectional view of the conventional flow control valve shown in FIG.

Hereinafter, the motor-operated valve according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a 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 positioned above the valve body 17.

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

Rotating rotor 4 is accommodated in the inner periphery of case 60, and valve shaft 41 is disposed on the shaft core portion of rotor 4 via bush member 33. The valve shaft 41 and the rotor 4 coupled by the bush member 33 move integrally in the vertical direction while rotating. A male screw 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 including a yoke, a bobbin, and a coil (not shown) is arranged, and the rotor 4 and the stator constitute a stepping motor.
A guide support 52 is fixed to the ceiling surface of the case 60. The guide support body 52 has a cylindrical portion 53 and an umbrella-shaped portion 54 formed on the upper end side of the cylindrical portion 53, and the whole is integrally formed by press working. The umbrella-shaped portion 54 is molded in substantially the same shape as the inside of the top portion of the case 60.

A cylindrical member 65 that 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 material containing a lubricant 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, a valve shaft holder 6 that has a function of forming a screw coupling A with the valve shaft 41 and suppressing the inclination of the valve shaft 41 as will be described later. It is fixed to be relatively non-rotatable.

FIG. 2 is a view showing the structure of the valve shaft holder 6. 2A is a side view of the valve shaft holder 6, and FIG. 2B is a top view of the valve shaft holder 6 viewed from above. Further, FIG. 2C is a bottom view when viewed from below, and FIG. 2D is a cross-sectional view taken along line AA in FIG. 2B.

As shown in FIG. 2, the valve shaft holder 6 is fitted with an upper cylindrical small-diameter portion 6a, a lower cylindrical large-diameter portion 6b, and a fitting portion 6c accommodated on the inner peripheral side of the valve body 30. This is a member composed of a flange portion 6f protruding from the joint portion 6c. Here, the cylindrical small-diameter portion 6a, the cylindrical large-diameter portion 6b, and the fitting portion 6c are made of a resin material such as PPS (polyphenylene sulfide) resin, and the flange portion 6f is made of a metal such as stainless steel. Is formed.

Further, as shown in FIGS. 2B and 2C, the fitting portion 6c is provided with a protruding portion 6c1 protruding in the four directions on the outer periphery. Further, the maximum outer diameter of the fitting portion 6 c formed by the outer wall surface of the protruding portion 6 c 1 is formed so as not to be smaller than the diameter on the inner peripheral surface side of the large diameter portion 72 a of the valve element guide member 72. . For this reason, when the valve shaft holder 6 is press-fitted into the valve body guide member 72, the protruding portion 6c1 of the valve shaft holder 6 can be closely locked to 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 element guide member 72. The flange portion 6f has a ring shape that surrounds the lower end of the cylindrical large-diameter portion 6b.

Also, 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 this embodiment, the valve shaft holder 6 functions as a female screw member. 1 is configured by the male screw 41a formed on the outer periphery of the valve shaft 41 and the female screw 6d formed on the inner periphery of the cylindrical small diameter portion 6a of the valve shaft holder 6. Yes.

Furthermore, a housing chamber 6 h for housing the valve guide 18 is formed inside the valve shaft holder 6. Further, a pressure equalizing hole 51 is formed in the side surface of the cylindrical large diameter portion 6b of the valve shaft holder 6, and the valve in the cylindrical large diameter portion 6b is formed by the pressure equalizing hole 51 as shown in FIG. The shaft holder chamber 83 and the rotor accommodating chamber 67 (second back pressure chamber) communicate with each other. By providing the pressure equalizing hole 51 as described above, the movement of the valve shaft holder 6 can be smoothly performed by communicating the space in which the rotor 4 of the case 60 is accommodated with the space in the valve shaft holder 6. it can.

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

Here, the valve shaft 41 is inserted into the through hole 18a of the valve guide 18 so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction. It arrange | positions in the valve guide 18 so that it can rotate with respect to the guide 18 and it can displace to radial direction. In addition, the valve shaft 41 is inserted through the through hole 18 a and is arranged so that the upper surface of the flange portion 41 b faces the ceiling portion 21 of the valve guide 18. The flange 41b is larger in diameter than the through hole 18a of the valve guide 18 so that the valve shaft 41 is prevented from coming off.

Since the valve shaft 41 and the valve guide 18 are movable in the radial direction with respect to each other, the valve guide 18 and the valve guide 18 and the valve shaft 41 are not required to have a high degree of concentric mounting accuracy with respect to the arrangement positions of the valve shaft holder 6 and the valve shaft 41. Concentricity with the valve body 17 is obtained.

Between the ceiling portion 21 of the valve guide 18 and the flange portion 41b of the valve shaft 41, a washer 70 having a through-hole formed at the center is installed. The washer 70 is preferably a metal washer having a highly slippery surface, a highly slippery resin washer such as a fluororesin, or a metal washer having a highly slippery resin coating.
Further, a compressed valve spring 27 and a spring receiver 35 are accommodated in the valve guide 18.

Further, a valve body guide member 72 that guides the movement of the valve body 17 in the axial direction is disposed inside the valve body 30, and a seal member 48 is interposed between the valve body 17 and the valve body guide member 72. It is intervened.

Here, in the valve body 17, a vertical hole 17b and a horizontal conduction hole 17c are formed as pressure equalization paths. The pressure in the valve port 16 (in the second pipe joint 15) is guided to the back pressure chamber 28 through the hole 17b and the conduction hole 17c which are pressure equalization paths.

The valve body guide member 72 is a cylindrical body through which the inside penetrates, and has a flange portion 72c positioned at the uppermost position, a large diameter portion 72a below the flange portion 72c, and a small diameter portion 72b below the stainless steel plate. It is formed by press molding a metal material such as. The diameter on the outer peripheral surface side of the large diameter portion 72 a of the valve body guide member 72 is slightly larger than the diameter on the inner peripheral surface side of the valve body 30. For this reason, when the valve body guide member 72 is press-fitted into the valve body 30, the large-diameter portion 72a of the valve body guide member 72 can be closely locked to the inner peripheral surface of the valve body 30, and the valve body guide member 72 is It is possible to prevent the valve body 30 from moving.

The seal member 48 is an annular member formed by sandwiching an annular reinforcing plate 48b between an annular packing 48a having an L-shaped cross section. In the seal member 48, leaf springs that constantly urge the annular packing 48a outward are respectively disposed above the annular packing 48a disposed above and below the annular packing 48a disposed below. 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 a 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 composed of independent members.

Here, when the motor-operated valve 2 is assembled, first, the valve body guide member 72 is press-fitted into the valve 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 is press-fitted into the valve body guide member 72 with the protruding portion 6 c 1 protruding from the outer periphery of the fitting portion 6 c in contact with the inner peripheral surface of the large diameter portion 72 a of the valve body guide member 72. After the press-fitting, the bottom 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 element guide member 72 are integrally sealed over the entire circumference by welding. Fixed.

Thus, when the outer peripheral surface of the large-diameter portion 72 a of the valve body guide member 72 is brought into contact with the inner peripheral surface of the valve body 30 and the valve body guide member 72 is press-fitted into the valve body 30, the valve body guide member 72 is Since the valve body guide member 72 can be tightly locked to the valve body 30, the valve body guide member 72 is naturally disposed at a position that is concentric with the valve body 30. Similarly, when the protruding portion 6c1 of the valve shaft holder 6 is brought into contact with the inner peripheral surface of the large diameter portion 72a of the valve body guide member 72 and the valve shaft holder 6 is press-fitted into the valve body guide member 72, the valve shaft holder 6 Therefore, the valve shaft holder 6 is naturally arranged at a position where it is concentric with the valve body guide member 72.

Therefore, according to the invention according to the first embodiment, when the motor-operated valve 2 is assembled, the valve main body 30, the valve body guide member 72, and the valve shaft holder 6 can be easily assembled without a high degree of assembly accuracy. Concentricity can be ensured, and positioning and fixing of the valve main body 30, the valve body guide member 72, and the valve shaft holder 6 are performed accurately. For this reason, it is not necessary to use a jig or the like to ensure concentricity. Further, the valve body guide member 72 is tightly locked to the valve body 30, whereby the first chamber 26 formed outside the valve body 17, the back formed by the valve body 17 and the valve shaft holder 6. Since the space between the pressure chamber 28 and the pressure chamber 28 is surely sealed, the pressure leakage between the first chamber 26 and the back pressure chamber 28 can be prevented.

Next, the motor-operated valve according to the second embodiment will be described with reference to the drawings. The motor-operated valve according to the second embodiment is a valve body guide member 72 provided with a step in the first embodiment. Therefore, 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 element guide member 72 includes a large diameter portion 72a, a lower small diameter portion 72b, and a flange portion 72c. Further, a step 74 is formed in the large diameter portion 72a over the entire circumference. FIG. 5 is an enlarged cross-sectional view of the vicinity of the step 74 that is the main part of the motor-operated valve 202. As shown in FIG. 5, the large-diameter portion 72 a of the valve element guide member 72 is configured by changing the diameter with respect to the step 74, and a first press-fitted portion 75 formed above the step 74, and below the step 74. The second press-fitting portion 76 having a smaller diameter than the first press-fitting portion 75 formed in the above is provided. In this way, by forming the step 74 in the large diameter portion 72 a of the valve body guide member 72, 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. A space 84 is formed between the valve body 30 and the valve body 30. For this reason, the valve element 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-fitted into the valve main body 30, The portion 75 is closely locked to the inner peripheral 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 shaft holder 6 is press-fitted into the valve element guide member 72, the protruding portion 6c1 of the valve shaft holder 6 is closely locked to the inner peripheral surface of the second press-fit portion 76.

Here, when the motor-operated valve 202 is assembled, the valve body guide member 72 is press-fitted into the valve main body 30 by bringing the outer peripheral surface of the first press-fit portion 75 of the large-diameter portion 72 a into contact with the inner peripheral surface of the valve main 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 first press-fit portion 75 can be contracted in the radial direction by the reaction force of the inner peripheral surface of the valve body 30. The valve body guiding member 72 is smoothly press-fitted into the valve body 30 as compared with the case where there is no step 74.

Further, the valve shaft holder 6 brings the protruding portion 6 c 1 protruding from the outer periphery of the fitting portion 6 c into contact with the inner peripheral surface of the second press-fit portion 76 of the large diameter portion 72 a of the valve body guiding member 72. It is press-fitted into. 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 protrusion 6c1 of the valve shaft holder 6, and the valve shaft The holder 6 is smoothly press-fitted into the valve element guide member 72.

After the press-fitting, the bottom 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 element guide member 72 are integrally sealed over the entire circumference by welding. Fixed.

According to the invention according to 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 guide member 72 can be elastically deformed in the radial direction. Thus, the valve body guide member 72 and the valve shaft holder 6 can be smoothly press-fitted into the valve body 30 and the valve body guide member 72, respectively, and the electric 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 body guide member 72, even if the valve body guide member 72 and the valve shaft holder 6 are inclined during the press-fitting process, the valve body Since the guide member 72 is elastically deformed in the radial direction, the valve body guide member 72 and the valve shaft holder 6 are not assembled while being tilted, and each of the valve body 30, the valve body guide member 72, and the valve shaft holder 6 is the same. The core property can be ensured accurately.

In each of the above-described embodiments, the case where the hole 17b and the conduction hole 17c are provided in the valve body 17 as an example of the pressure equalizing path has been described as an example. However, the pressure equalizing path is not necessarily provided in the valve body 17. It does not have to be provided. For example, instead of providing a pressure equalization path in the valve body 17, a piping member that guides the pressure of the valve port 16 to the back pressure chamber 28 may be provided separately.

Further, in each of the above-described embodiments, 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 guided to the back pressure chamber 28 through the pressure equalization path. Although the motor-driven valve 2 having a structure that cancels out the force due to the pressure acting on the valve body 17 has been described as an example, a motor-operated valve that does not have such a structure may be used.

2 Motorized valve 6 Valve shaft holder (Female thread member)
6c Fitting portion 6c1 Protruding portion 6d Female thread 17 Valve body 30 Valve body 41 Valve shaft 41a Male thread 48 Seal member 72 Valve body guide member 72a Large diameter portion 72b Small diameter portion 72c Flange portion 74 Step 75 First press-fit portion 76 Second Press-in part 82 space 84 space

Claims

The rotational motion of the rotor is converted into a linear motion by screw connection between the male screw member and the female screw member, and the valve body accommodated in the valve body is axially guided by the valve body guide member based on this linear motion. A motorized valve to be moved,
The motor-operated valve, wherein the female screw member is assembled by being press-fitted into the valve body guide member.
The motor-operated valve according to claim 1, wherein the valve body guide member is assembled by being press-fitted into the valve body.
By providing a step in the valve body guide member, the valve body guide member is formed with a first press-fit portion and a second press-fit portion having a smaller diameter than the first press-fit portion due to the step,
The valve body guide member is assembled to the valve body by press-fitting the first press-fit portion into the valve body;
The motor-operated valve according to claim 2, wherein the female screw member is press-fitted into the second press-fitting portion of the valve element guide member and is assembled to the valve body.