JP2022140544A - Motor valve and refrigeration cycle system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor valve capable of accurately maintaining quietness and a refrigeration cycle system employing the motor valve.

SOLUTION: The present invention relates to a motor valve configured to convert a rotational motion of a rotor that is accommodated in an inner periphery of a case into a linear motion by threading a male screw member and a female screw member and move a valve element that is accommodated in a valve body in an axial direction based on the linear motion. The motor valve comprises: a first pipe joint which is mounted on a side face of the valve body; a valve seat member including a valve port to/from which the valve element is made proximate/separated; and a second pipe joint that is communicated with the first pipe joint through the valve port. A top face of the valve seat member in the axial direction is positioned closer to the rotor than a central axis of the first pipe joint. A valve chamber within the valve body includes: a first space that is formed closer to the rotor than the first pipe joint in the axial direction; and a second space that is formed closer to the second pipe joint than the first pipe joint in the axial direction.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a motor-operated valve and a refrigeration cycle system using the motor-operated valve.

2. Description of the Related Art Conventionally, an electrically operated valve having a structure as shown in FIG. 5 is known (see, for example, Patent Document 1). That is, when the stepping motor is driven and the rotor 103 rotates, the valve element 114 moves in the direction of the central axis L due to the feeding action of the female thread 131a and the male thread 121a. As a result, the opening degree of the valve port 130b is adjusted, and the flow rate of the fluid flowing in from the pipe joint 111 and flowing out from the pipe joint 112, or the flow rate of the fluid flowing from the pipe joint 112 and flowing out from the pipe joint 111 is controlled. be done.

Here, when controlling the flow rate of various fluids, there is a problem that the fluid passing sound is generated, so noise reduction is required. In addition, when the refrigerant flow rate is controlled by the motor-operated valve 100 in an indoor unit of a refrigerating cycle of a home air conditioner or a commercial air conditioner using a refrigerant, the liquid refrigerant is a two-phase gas-liquid mixture before and after passing through the valve port 130b. Because it is fluid, it is particularly required to demonstrate quietness even under various refrigerant conditions and operating conditions.

JP 2016-089870 A

By the way, the above-described electric valve 100 is fixed to a fluid pipe (not shown) via a pipe joint 111 and a pipe joint 112, and the valve body 114 and the valve port 130b of the valve seat 130 are exposed in the flow path. Therefore, in the motor operated valve 100, when a high pressure difference occurs between the inlet side and the outlet side of the valve port 130b, especially when the flow flows from the pipe joint 111 to the pipe joint 112, as shown in FIG. , the fluid such as the refrigerant flowing from the pipe joint 111 may hit the valve body 114, and the collision force may cause the valve body 114 to vibrate in the radial direction (C). When noise is generated due to this vibration, the motor-operated valve 100 may not be able to maintain its quietness.

Here, as shown in FIG. 7, it is conceivable to raise the position of the top surface 130a of the valve seat 130 so that the fluid flowing into the valve chamber 121 from the pipe joint 111 does not directly hit the valve body 114. be done. However, in this case, since most of the fluid that hits the valve body 114 flows upward, an upward force is applied to the valve body 114, causing the valve body 114 to vibrate in the vertical direction (E). Therefore, in this case also, it becomes difficult to maintain silence.

SUMMARY OF THE INVENTION An object of the present invention is to provide a motor-operated valve that can accurately maintain silence, and a refrigeration cycle system using the motor-operated valve.

The motor operated valve of the present invention is
The rotary motion of the rotor accommodated in the inner circumference of the case is converted into linear motion by threading the male screw member and the female screw member, and based on this linear motion, the valve body accommodated in the valve body is pivoted. A motor-operated valve that moves in the direction of
a first pipe joint attached to the side surface of the valve body;
a valve seat member having a valve port that allows the valve body to approach or separate;
a second pipe joint communicating with the first pipe joint via the valve port;
the position of the top surface of the valve seat member in the axial direction is located closer to the rotor than the central axis of the first pipe joint;
The valve chamber in the valve body includes a first space formed closer to the rotor than the first pipe joint in the axial direction, and a space closer to the second pipe joint than the first pipe joint in the axial direction. and a second space formed in the second space.

According to this, by raising the position of the top surface of the valve seat member, it is possible to prevent the fluid flowing from the first pipe joint from directly colliding with the valve body, thereby suppressing the radial vibration of the valve body. can do. In addition, by providing a second space in addition to the first space in the valve body, all the fluid that has flowed in from the first pipe joint flows upward, and an upward force is applied to the valve body, causing the valve body to move in the axial direction. vibration can be suppressed. By reducing the load on the valve body in this way, the vibration of the valve body in the radial direction and the axial direction can be reduced, and the quietness of the motor-operated valve can be properly maintained.

Further, the motor operated valve of the present invention is
The inner diameter of the valve body is larger than the inner diameter of the first pipe joint.
As a result, it is possible to accurately secure an escape space for the fluid.

Further, the motor operated valve of the present invention is
The bottom end of the outer diameter of the first pipe joint is arranged closer to the rotor than the inner bottom surface of the valve body.
Thereby, the upward flow of the fluid that has flowed in from the first pipe joint can be suppressed more accurately.

Further, the motor operated valve of the present invention is
The position of the top surface of the valve seat member in the axial direction does not exceed the uppermost end of the inner diameter of the first pipe joint in the axial direction.
As a result, the fluid that has flowed in from the first pipe joint can be accurately distributed vertically and guided to the first space and the second space.

Further, the refrigeration cycle system of the present invention is
A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, characterized in that the above-described motor-operated valve is used as the expansion valve.

ADVANTAGE OF THE INVENTION According to the invention which concerns on this invention, the motor-operated valve which can maintain quietness reliably, and a refrigerating-cycle system using this motor-operated valve can be provided.

1 is a schematic cross-sectional view of an electrically operated valve according to an embodiment; FIG. FIG. 2 is an enlarged view of a main part of the motor-operated valve according to the embodiment; FIG. 2 is a side view of the essential parts of the motor-operated valve according to the embodiment; FIG. 5 is a view showing the top surface of the valve seat member viewed from inside the first pipe joint connected to the electrically operated valve according to the embodiment; 1 is a schematic cross-sectional view of a conventional electric valve; FIG. FIG. 2 is an enlarged view of a main part of a conventional electric valve; FIG. 4 is an enlarged view of a main part of a motor-operated valve as a comparative example;

A motor-operated valve according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an electrically operated valve 2 according to an embodiment. In this specification, the terms "upper" and "lower" are defined in the state shown in FIG. That is, the rotor 4 is positioned above the valve body 17 .

In the electric valve 2, the valve main body 30 is integrally connected by welding or the like to the lower opening side of the cylindrical cup-shaped case 60 made of metal.
Here, the valve body 30 is made of metal such as stainless steel, and has the valve chamber 11 therein. A first pipe joint 12 made of stainless steel or copper, for example, which directly communicates with the valve chamber 11 is fixedly attached to the valve body 30 . Further, the bottom surface of the valve body 30 incorporates a valve seat member 16 having a valve port 16a with a circular cross section. A second pipe joint 15 made of stainless steel or copper, for example, which communicates with the first pipe joint 12 via the valve port 16 a and the valve chamber 11 is fixedly attached to the valve seat member 16 .

A rotatable rotor 4 is accommodated in the inner circumference of the case 60 , and a valve shaft 41 is arranged at the axial center portion of the rotor 4 via a bush member 33 . The rotor 4 is made of a magnetic material such as a resin material containing magnetic powder or a ferrite magnet. The bush member 33 and the valve shaft 41 are both made of metal such as stainless steel. A male screw 41a is formed on the outer peripheral surface of the valve shaft 41 near the intermediate portion. In this embodiment, the valve shaft 41 functions as a male screw member. Also, the valve body 17 can be brought close to or separated from the valve port 16a.

A stator composed of a yoke, a bobbin, a coil, and the like (not shown) is arranged around the outer periphery of the case 60, and the rotor 4 and the stator constitute a stepping motor.
Below the bushing member 33 of the valve shaft 41, the valve shaft holder 6, which forms a screw feed mechanism A together with the valve shaft 41 as described later and has a function of suppressing the inclination of the valve shaft 41, is mounted on the valve body. It is non-rotatably fixed relative to 30 .

The valve shaft holder 6 includes an upper cylindrical small diameter portion 6a, a lower cylindrical large diameter portion 6b, a fitting portion 6c accommodated in the inner peripheral side of the valve main body 30, and a ring-shaped flange portion 6f. consists of The flange portion 6f of the valve shaft holder 6 is fixed to the upper end of the valve body 30 by welding or the like. Further, inside the valve shaft holder 6, a housing chamber 6h is formed for housing a valve guide 18, which will be described later. The valve shaft holder 6 is made of a resin material except for the metal flange portion 6f.

A female screw 6d is formed downward to a predetermined depth from an upper opening 6g of the cylindrical small diameter portion 6a of the valve shaft holder 6. As shown in FIG. Therefore, in this embodiment, the valve stem holder 6 functions as a female screw member. A screw feed mechanism A is composed of a male thread 41a formed on the outer periphery of the valve shaft 41 and a female thread 6d formed on the inner periphery of the cylindrical small diameter portion 6a of the valve shaft holder 6. As shown in FIG.

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 shaft holder chamber 83 in the cylindrical large diameter portion 6b and the rotor are separated by the pressure equalizing hole 51. It communicates with the housing chamber 67 (second back pressure chamber). By providing the pressure equalizing hole 51 in this manner, the space in the case 60 that accommodates the rotor 4 and the space in the valve shaft holder 6 are communicated with each other, so that the movement of the valve body 17 can be performed smoothly. .

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

Here, the valve shaft 41 is inserted loosely through 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 is positioned within the valve guide 18 so as to be rotatable relative to the guide 18 and radially displaceable. Further, the valve shaft 41 is inserted through the through hole 18a, and the upper surface of the collar portion 41b is arranged so as to face the ceiling portion 21 of the valve guide 18. As shown in FIG. It should be noted that the valve stem 41 is prevented from slipping out by the collar portion 41b having a diameter larger than that of the through hole 18a of the valve guide 18. As shown in FIG.

Since the valve shaft 41 and the valve guide 18 are movable relative to each other in the radial direction, the valve shaft holder 6 and the valve shaft 41 are not required to have a very high degree of concentric mounting accuracy. 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 in the center thereof is installed.

Next, a main part of the motor operated valve 2 according to the embodiment will be described. FIG. 2 is an enlarged view of a main part of the motor operated valve 2 according to the embodiment. As shown in FIG. 2, a valve chamber 11 is formed in the valve body 30 . In this embodiment, the valve chamber 11 is divided into three spaces, which will be described below. That is, in the direction of the axis M, the valve chamber 11 includes a first space 11a formed above the first pipe joint 12 (on the side of the rotor 4), and below the first pipe joint 12 (on the second pipe). A second space 11b formed at a position on the joint 15 side) and a third space 11c formed at a position on the same level as the first pipe joint 12 are included. Here, the upper side of the first pipe joint 12 more specifically means the upper side of the outer diameter of the first pipe joint 12 above the uppermost end X1. Similarly, the lower side of the first pipe joint 12 means the lower side of the outer diameter of the first pipe joint 12 than the lowermost end X2.

The first space 11 a is a substantially cylindrical space, and its upper portion is in contact with the lower portion of the valve shaft holder 6 and the valve body 17 .
The second space 11 b is a substantially annular space and is formed around the valve seat member 16 . This second space 11b is formed by attaching the lowest outer diameter end X2 of the first pipe joint 12 above the bottom surface 30a of the valve body 30. As shown in FIG. More preferably, the first pipe joint 12 is attached so that the depth (L) of the second space 11b is deeper than the radius (D/2) of the inner diameter of the first pipe joint (L>D/ 2).

Further, the valve seat member 16 having a high height is used in the electric valve 2 according to the embodiment. Specifically, when the valve seat member 16 is fixedly attached to the second pipe joint 15, the position of the top surface 16b in the direction of the axis M is positioned above the position of the central axis N of the first pipe joint 12. is used.

Moreover, as shown in FIG. 3, the top surface 16b is preferably located at a height that can be visually recognized when the inside of the first pipe joint 12 is viewed from the direction of the arrow (B) in FIG. That is, it is preferable that the valve seat member 16 is arranged at a position where the top surface 16b does not exceed the uppermost end of the inner diameter of the first pipe joint 12 in the direction of the axis M. In this case, as shown in FIG. 4, if the lowermost end of the inner diameter of the first pipe joint 12 is used as a vertical reference, the position (H) of the top surface 16b corresponds to the position (D /2) and below the uppermost end (D) of the inner diameter of the first pipe joint 12 (D/2<H<D).

Here, as shown in FIG. 2, the velocity of the fluid flowing into the valve chamber 11 from the first pipe joint 12 is the fastest at the center and becomes slower toward the inner periphery of the first pipe joint 12 . Therefore, if the top surface 16b is positioned below the central axis N of the first pipe joint 12, the fluid at a high speed directly hits the valve body 17, causing a large radial load on the valve body 17. to vibrate the valve body 17 in the radial direction.

On the other hand, when the top surface 16b is positioned at the position (D/2<H<D) described with reference to FIG. Second, the fastest portion of the fluid once collides with the outer periphery of the valve seat member 16, reduces its speed, and branches vertically. The upwardly branched fluid is introduced into the first space 11a, and the downwardly branched fluid is introduced into the second space 11b.

Here, in the motor-operated valve 2 according to the embodiment, since the height of the top surface 16b is not too high, the upward force applied to the valve body 17 by the fluid branched upward (see FIG. 7) is reduced.

Furthermore, since the second space 11b is provided on the lower side of the valve chamber 11, an escape route for the downward branched fluid is secured. As a result, the downwardly branched fluid is prevented from flowing upward without escape and exerting an upward force on the valve body 17 .

Further, in the electric valve 2 according to the embodiment, the inner diameter Y (see FIG. 2) of the valve body 30 is formed to be larger than the inner diameter (D) of the first pipe joint 12 (Y>D). . Therefore, it is possible to reliably secure an escape space for the fluid that has flowed into the valve chamber 11 .

According to the electrically operated valve 2 of this embodiment, by increasing the position of the top surface 16b of the valve seat member 16, it is possible to prevent the fluid flowing in from the first pipe joint 12 from directly colliding with the valve body 17. Vibration in the radial direction of the valve body 17 can be suppressed. In addition, by providing the second space 11b in addition to the first space 11a in the valve body 30, all the fluid flowing from the first pipe joint 12 flows upward, and an upward force is applied to the valve body 17. Vibration of the valve body 17 in the direction of the axis M can be suppressed. In this way, by reducing the load on the valve body 17, the vibration of the valve body 17 in the radial direction and the axial direction can be reduced. The quietness of the motor-operated valve 2 can be maintained accurately even in

In addition, since the quietness of the motor-operated valve 2 is maintained simply by raising the position of the top surface 16b of the valve seat member 16, the structure of the motor-operated valve 2 is not complicated, and a sound absorbing member, a silencer, and the like are not required. Since it is not used, the quietness of the motor-operated valve 2 can be maintained at low cost.

Also, the motor-operated valve 2 of the above-described embodiment is used as an expansion valve provided between the condenser and the evaporator in a refrigeration cycle system comprising a compressor, a condenser, an expansion valve, an evaporator, etc., for example. be done.

2 Electric valve 6d Internal thread 11 Valve chamber 11a First space 11b Second space 11c Third space 12 First pipe joint 15 Second pipe joint 16 Valve seat member 16a Valve port 16b Top surface 17 Valve body 18 Valve guide 30 Valve body 30a Bottom surface 41a Male screw M Axis N of motor operated valve 2 Central axis X1 of first pipe joint 12 Uppermost end X2 of outer diameter of first pipe joint 12 Lowermost end Y of outer diameter of first pipe joint 12 Internal diameter of valve body 30

The motor operated valve of the present invention is
The rotary motion of the rotor accommodated in the inner circumference of the case is converted into linear motion by threading the male screw member and the female screw member, and based on this linear motion, the valve body accommodated in the valve body is pivoted. A motor-operated valve that moves in the direction of
a first port opened to the side surface of the valve body;
a valve seat member having a flat top surface with a valve port that allows the valve body to approach or separate;
a second port communicating with the first port through the valve port;
In the axial direction of the top surface of the valve seat member , the fluid flowing into the valve chamber in the valve body from the first port is divided into the rotor side direction and the second port side direction of the valve body. is located on the rotor side of the central axis of the first port and at a height not exceeding the uppermost end of the inner diameter of the first port ,
The valve chamber in the valve body includes a first space formed closer to the rotor than the first port in the axial direction and a space closer to the second port than the first port in the axial direction. and a second space.
Further, the motor operated valve of the present invention is
The rotary motion of the rotor accommodated in the inner circumference of the case is converted into linear motion by threading the male screw member and the female screw member, and based on this linear motion, the valve body accommodated in the valve body is pivoted. A motor-operated valve that moves in the direction of
a first port opened to the side surface of the valve body;
a valve seat member having a flat top surface with a valve port that allows the valve body to approach or separate;
a second port communicating with the first port through the valve port;
The position of the top surface of the valve seat member in the axial direction is closer to the rotor than the central axis of the first port, and the extension of the central axis of the first port and the outer peripheral surface of the valve seat member intersect, and the position of the top surface of the valve seat member in the axial direction is located at a height that does not exceed the uppermost end of the inner diameter of the first port,
The valve chamber in the valve body includes a first space formed closer to the rotor than the first port in the axial direction, and a space formed closer to the second port than the first port in the axial direction. a second space and
The axial position of the seating tapered surface of the valve body is located closer to the rotor than the uppermost end of the inner diameter of the first port when the valve is fully opened.

According to this, by raising the position of the top surface of the valve seat member, it is possible to prevent the fluid flowing in from the first port from directly colliding with the valve body, thereby suppressing radial vibration of the valve body. be able to. In addition, by providing the second space in addition to the first space in the valve body, all of the fluid that has flowed in from the first port flows upward, and an upward force is applied to the valve body, causing the valve body to move in the axial direction. Vibration can be suppressed. By reducing the load on the valve body in this way, the vibration of the valve body in the radial direction and the axial direction can be reduced, and the quietness of the motor-operated valve can be properly maintained.
In addition, the fluid that has flowed in from the first port can be accurately distributed vertically and guided to the first space and the second space.

Further, the motor operated valve of the present invention is
The inner diameter of the valve body is larger than the inner diameter of the first port .
As a result, it is possible to accurately secure an escape space for the fluid.

Further, the motor operated valve of the present invention is
A lowermost end of the inner diameter of the first port is arranged closer to the rotor than the inner bottom surface of the valve body.
Thereby, the upward flow of the fluid that has flowed in from the first port can be more accurately suppressed.

Further, the motor operated valve of the present invention is
The axial distance between the central axis of the first port and the lower end surface of the valve stem holder corresponds to the radial distance between the outer peripheral surface of the valve seat member and the valve chamber side end of the first port. and the axial distance between the central axis of the first port and the bottom surface of the valve body is greater than the distance between the outer peripheral surface of the valve seat member and the end of the first port on the valve chamber side. It is characterized by being larger than the radial distance between the parts.
Further, the motor operated valve of the present invention is
The top surface of the valve seat member has an annular shape and is connected to the outer peripheral edge of the valve seat member.

Claims (5)

The rotary motion of the rotor accommodated in the inner circumference of the case is converted into linear motion by threading the male screw member and the female screw member, and based on this linear motion, the valve body accommodated in the valve body is pivoted. A motor-operated valve that moves in the direction of
a first pipe joint attached to the side surface of the valve body;
a valve seat member having a valve port that allows the valve body to approach or separate;
a second pipe joint communicating with the first pipe joint via the valve port;
the position of the top surface of the valve seat member in the axial direction is located closer to the rotor than the central axis of the first pipe joint;
The valve chamber in the valve body includes a first space formed closer to the rotor than the first pipe joint in the axial direction, and a space closer to the second pipe joint than the first pipe joint in the axial direction. and a second space formed in the motor-operated valve. 2. The motor-operated valve according to claim 1, wherein the inner diameter of the valve body is larger than the inner diameter of the first pipe joint. 3. The motor-operated valve according to claim 1, wherein the lowermost end of the outer diameter of said first pipe joint is arranged closer to said rotor than the inner bottom surface of said valve body. The position of the top surface of the valve seat member in the axial direction does not exceed the uppermost end of the inner diameter of the first pipe joint in the axial direction. electric valve. A refrigeration cycle system comprising a compressor, a condenser, an expansion valve, and an evaporator, wherein the motor-operated valve according to any one of claims 1 to 4 is used as the expansion valve. .

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