JP7565698B2 - Motor-operated valve and refrigeration cycle system - Google Patents

Description

The present invention relates to an electrically operated valve for use in a refrigeration cycle system and a refrigeration cycle system.

Conventionally, motorized valves have been used in which a rotating shaft such as a rotor shaft is rotated by a drive unit such as a stepping motor, and the rotational motion of the rotating shaft is converted to linear motion by a screw feed mechanism to open and close the valve (see, for example, Patent Documents 1 and 2). In this type of motorized valve, a valve holder incorporating a bearing and a valve spring is provided between the valve body and the screw feed mechanism to suppress the co-rotation of the valve body and excessive pressing of the valve body against the valve seat and to improve durability due to the seating of the valve. There are two types of bearings that are incorporated in such valve holders: rolling bearings and sliding bearings. Rolling bearings have a smaller rotational load and require less output from the rotation drive unit, resulting in a highly efficient motorized valve.

Patent No. 6472637 China Utility Model Registration No. 208519284

However, in conventional motor-operated valves such as those disclosed in Patent Documents 1 and 2, there was a risk that impurities such as shavings generated by the screw feed mechanism could get into the rolling bearing through the gaps in the valve holder, causing operational problems.

The object of the present invention is to provide an electric valve and a refrigeration cycle system that can suppress malfunctions caused by impurities entering the inside of a rolling bearing.

The motor-operated valve of the present invention comprises a valve body which constitutes a valve chamber and a valve seat portion, a valve element which moves axially towards and away from the valve seat portion to change the opening degree of the valve port, a drive unit which rotationally drives a rotating shaft, a screw feed mechanism which converts the rotational motion of the rotating shaft into linear motion in the axial direction and transmits it to the valve element, a valve holder which spans the valve element and the rotating shaft, and a valve spring which urges the valve element in a valve closing direction, wherein the valve element is connected to the valve holder via the rolling bearing while being engaged in the axial direction only by the rolling bearing , and when the rotating shaft moves further in the valve closing direction after the valve element is closed, the rolling bearing and the valve element are subjected to the urging force of the valve spring.

According to the present invention, the valve holder and the valve body are connected via a rolling bearing, and this rolling bearing is provided on the valve body side, so that the screw feed mechanism, where shavings and the like are generated, can be spaced apart from the rolling bearing, and problems caused by impurities such as shavings from the screw feed mechanism getting into the rolling bearing can be suppressed.

In this case, it is preferable that the valve holder has an insertion hole through which the tip of the rotating shaft is inserted and is engaged with the tip of the rotating shaft so as to be capable of relative rotation.

It is also preferable that the tip of the rotating shaft and the valve holder are integrally formed or joined to each other.

The rolling bearing preferably has a first member attached to the valve body or formed integrally with the valve body, and a second member connected to the first member via a rolling member, and the first member is biased by the valve spring via a spring bearing.

It is also preferable that the rolling bearing has a second member attached to the valve holder or formed integrally with the valve holder, and a first member connected to the second member via a rolling member, and that the valve body is guided by the first member and biased against the first member by the valve spring.
Further, an electrically operated valve includes a valve body constituting a valve chamber and a valve seat portion, a valve element which moves axially toward and away from the valve seat portion to change the opening degree of a valve port, a drive portion which rotates a rotating shaft, a screw feed mechanism which converts the rotational motion of the rotating shaft into linear motion in the axial direction and transmits it to the valve element, a valve holder which spans the valve element and the rotating shaft, and a valve spring which biases the valve element in a valve closing direction, wherein the valve element is connected to the valve holder via the rolling bearing in a state in which it is axially engaged only by the rolling bearing, and the rolling bearing has a first member which is attached to the valve element or formed integrally with the valve element, and a second member which is connected to the first member via a rolling member, and the second member is biased by the valve spring.

The refrigeration cycle system of the present invention is a refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, and is characterized in that any one of the motor-operated valves is used as the expansion valve.

According to the present invention, as with the motor-operated valve described above, it is possible to suppress malfunctions caused by impurities such as shavings from the screw feed mechanism entering the inside of the rolling bearing, resulting in a refrigeration cycle system that is less likely to malfunction during operation.

The motor-operated valve and refrigeration cycle system of the present invention can suppress operational problems caused by impurities entering the rolling bearing.

1 is a vertical cross-sectional view showing a motor-operated valve according to a first embodiment of the present invention. 2 is a vertical cross-sectional view showing a simplified view of a main part of the motor-operated valve. FIG. FIG. 6 is a vertical cross-sectional view showing a main portion of a motor-operated valve according to a second embodiment of the present invention. FIG. 11 is a vertical cross-sectional view showing a main part of a motor-operated valve according to a third embodiment of the present invention. FIG. 10 is a vertical cross-sectional view showing a main portion of a motor-operated valve according to a fourth embodiment of the present invention. FIG. 13 is a longitudinal sectional view showing a main part of a motor-operated valve according to a fifth embodiment of the present invention. 1 is a diagram showing an example of a refrigeration cycle system of the present invention.

The motor-operated valve according to the first embodiment of the present invention will be described with reference to Figs. 1 and 2. As shown in Fig. 1, the motor-operated valve 10 according to this embodiment includes a valve body 1, a valve element 2, a valve holder 6, and a stepping motor 3 as a drive unit. Note that the concept of "upper and lower" in the following description corresponds to the upper and lower in the drawing of Fig. 1.

The valve body 1 has a cylindrical valve housing member 1A and a support member 5 that is fixed to the upper end opening of the valve housing member 1A.

The valve housing member 1A has a substantially cylindrical valve chamber 1C formed therein, and a first coupling tube 11 is attached to the side surface of the valve housing member 1A, which communicates with the valve chamber 1C. A substantially cylindrical valve seat member 15 is inserted into the valve housing member 1A from the bottom surface side, and the valve seat member 15 is fixed by brazing to form a valve seat portion 13. A valve port 14, which is a valve opening, is formed in the valve seat portion 13. Furthermore, a second coupling tube 12 is fixed to the bottom of the valve housing member 1A by brazing on the bottom surface side of the valve housing member 1A so as to be smoothly continuous with the lower end of the inner surface of the valve seat member 15. When a refrigerant as a fluid flows in from the first coupling tube 11, the refrigerant that has passed through the valve port 14 via the valve chamber 1C flows out from the second coupling tube 12. In addition, when refrigerant flows in from the second joint pipe 12, the refrigerant that passes through the valve chamber 1C via the valve port 14 flows out from the first joint pipe 11.

The support member 5 is welded to the upper end opening of the valve housing member 1A via a fixing bracket 41. A female threaded portion 5a is provided at the center of the upper side of the support member 5, which is formed coaxially with the axis L of the valve port 14, etc., and a cylindrical guide hole 5c with a diameter larger than the outer periphery of the female threaded portion 5a is formed below.

The valve body 2 has a rod shaft 22 with a needle portion 21 at its lower end. A flange portion 23 is formed at the upper end of the rod shaft 22. A rolling bearing 8 (described later) is fixed to the outer circumferential surface of the rod shaft 22, and the rolling bearing 8 is prevented from coming loose by the flange portion 23, which is an enlarged portion of the upper end of the rod shaft 22.

The stepping motor 3 has a can 4, a magnet rotor 31 provided in the can 4, a rotor shaft 32, a stator coil (not shown), and a rotation stopper mechanism 7 for the stepping motor 3.

The can 4 is fixed airtightly to the upper end of the valve housing 1A by welding or the like, and houses the support member 5, the magnet rotor 31 described later, and the rotation stopper mechanism 7. The magnet rotor 31 has its outer periphery magnetized with multiple poles, and the rotor shaft 32 is fixed to its center. The rotor shaft 32 has its lower end connected to the rod shaft 22 of the valve body 2 via the valve holder 6 and the rolling bearing 8. The rotor shaft 32 also has a male thread 32a formed on the upper surface of its middle part. This male thread 32a is screwed into the female thread 5a of the support member 5, and these male thread 32a and female thread 5a constitute the screw feed mechanism 16 of the drive unit. The screw feed mechanism 16 converts the rotational motion of the stepping motor 3 into linear motion of the rotor shaft 32, thereby driving the valve body 2 forward and backward in the axial L direction. The stator coil is arranged on the outer periphery of the can 4, and when a pulse signal is given to this stator coil, the magnet rotor 31 rotates according to the number of pulses, causing the rotor shaft 32 to rotate.

The rotation stopper mechanism 7 of the stepping motor 3 has a guide support 7A fixed to the ceiling of the can 4, and the guide support 7A has a cylindrical guide 76 suspended along the central axis of the ceiling of the can 4, a screw guide 77 fixed to the outer periphery of the guide 76, and a movable slider 78 that can rotate and move up and down guided by the screw guide 77. The movable slider 78 has a claw portion 78a protruding radially outward, and the magnet rotor 31 has an extension portion 31a that extends upward and abuts against the claw portion 78a. When the magnet rotor 31 rotates, the extension portion 31a presses the claw portion 78a, causing the movable slider 78 to rotate and move up and down following the screw guide 77. In addition, a tube member 7B that guides the upper part of the rotor shaft 32 is fitted inside the cylindrical guide 76.

The spiral guide 77 is formed with an upper end stopper 77a that determines the uppermost position of the magnet rotor 31, and a lower end stopper 77b that determines the lowermost position of the magnet rotor 31. When the movable slider 78, which has descended in association with the forward rotation of the magnet rotor 31, abuts against the lower end stopper 77b, the movable slider 78 becomes unable to rotate at this abutting position, thereby restricting the rotation of the magnet rotor 31 and stopping the descent of the valve body 2. On the other hand, when the movable slider 78, which has ascended in association with the reverse rotation of the magnet rotor 31, abuts against the upper end stopper 77a, the movable slider 78 becomes unable to rotate at this abutting position, thereby restricting the rotation of the magnet rotor 31 and stopping the ascent of the valve body 2.

2, the valve holder 6 has an insertion hole 61a in the center of the upper surface of the cylindrical holder body 61 through which the lower end of the rotor shaft 32 is inserted, and is engaged with the lower end of the rotor shaft 32 so as to be rotatable relative to the rotor shaft 32. A flange 32b is provided at the lower end of the rotor shaft 32 so as not to come out of the holder body 61. The upper end of the valve spring 9 abuts against the lower surface of the flange 32b of the rotor shaft 32. The rolling bearing 8 is composed of a bearing having a ring-shaped first member 81 fixed to the outer circumferential surface of the rod shaft 22 of the valve body 2 and a ring-shaped second member 82 connected via a plurality of steel balls 8a as rolling members. In this rolling bearing 8, the second member 82 is biased by the valve spring 9, and the lower end of the second member 82 abuts against the lower end of the holder body 61 (press-in member 63). The valve holder 6 has an insertion hole 61b in the center of the bottom surface of the holder body 61, and the rod shaft 22 of the valve body 2 is inserted into the insertion hole 61b. In addition, as shown in FIG. 1, a ring-shaped press-in member 63 is pressed into the insertion hole 61b, and this press-in member 63 prevents the valve body 2 and the rolling bearing 8 from coming out of the valve holder 6. Note that here, the press-in member 63 is pressed into the bottom end of the holder body 61, but instead, a ring-shaped member (such as a retaining ring) may be fixed to the bottom end of the holder body 61 by welding or crimping, and is not limited to these as long as the structure is capable of preventing the rolling bearing 8 from coming out.

When the valve body 2 is lowered by the drive of the stepping motor 3 and the needle portion 21 is seated on the valve seat portion 13, even if a rotational force is transmitted from the flange portion 32a of the rotor shaft 32 to the second member 82 of the rolling bearing 8 via the valve spring 9, almost no rotational force is transmitted to the first member 81 via the steel ball 8a. In addition, since the rotor shaft 31 and the valve body 2 are not connected as rigid bodies but are connected via the valve spring 9, when the needle portion 21 of the valve body 2 is seated on the valve seat portion 13, even if the magnet rotor 31 further rotates and the rotor shaft 32 descends, the valve spring 9 contracts, so that an excessive pressing force is not applied to the needle portion 21.

According to the present embodiment described above, the valve holder 6 and the valve body 2 are connected via the rolling bearing 8, and by providing this rolling bearing 8 on the valve body 2 side, the distance (distance A in FIG. 2) between the screw feed mechanism 16, where shavings and the like are generated, and the rolling bearing 8 can be increased, thereby suppressing operational problems caused by impurities such as shavings from the screw feed mechanism 16 getting into the rolling bearing 8.

Next, a motor-operated valve according to a second embodiment of the present invention will be described with reference to FIG. 3. The motor-operated valve of this embodiment, like the motor-operated valve 10 of the first embodiment, comprises a valve body 1, a valve element 2, a valve holder 6, and a stepping motor 3 as a drive unit. In the motor-operated valve of this embodiment, a portion of the configuration of the valve holder 6 differs from that of the motor-operated valve 10 of the first embodiment. The differences will be described in detail below.

The motor-operated valve of this embodiment differs from the motor-operated valve 10 of the first embodiment in that there is no flange 32b at the lower end of the rotor shaft 32, there is no insertion hole 61a on the upper side of the holder body 61 of the valve holder 6, the lower end of the rotor shaft 32 and the center of the upper surface of the holder body 61 are integrally connected, and the upper end of the valve spring 9 abuts against the ceiling surface inside the cylinder of the holder body 61. Note that the rotor shaft 32 and the holder body 61 are not limited to being integrally connected, and may be formed as separate bodies and joined by an appropriate joining means.

In the valve holder 6 of the motor-operated valve of this embodiment, the linear distance between the screw feed mechanism 16 and the rolling bearing 8 (distance indicated by A in FIG. 3) is large, and the lower end of the rotor shaft 32 and the holder body 61 of the valve holder 6 are integrally formed, and there are no gaps such as holes communicating with the inside on the upper surface of the holder body 61, so the distance along the surface of the valve holder 6 between the screw feed mechanism 16 and the rolling bearing 8 (distance indicated by B in FIG. 3) is also large. Therefore, operational problems caused by impurities such as shavings from the screw feed mechanism 16 getting into the rolling bearing 8 can be further suppressed than in the motor-operated valve 10 of the first embodiment.

Next, a motor-operated valve according to a third embodiment of the present invention will be described with reference to FIG. 4. The motor-operated valve of this embodiment, like the motor-operated valve 10 of the first embodiment, comprises a valve body 1, a valve element 2, a valve holder 6, and a stepping motor 3 as a drive unit. In the motor-operated valve of this embodiment, a portion of the configuration of the valve holder 6 differs from that of the motor-operated valve 10 of the first embodiment. The differences will be described in detail below.

In the motor-operated valve of this embodiment, the rolling bearing 8 has a first member 81 formed in a disk shape integral with the rod shaft 22 of the valve body 2, a plurality of steel balls 8a are provided on the underside of the first member 81 so as to be able to roll, and a second member 82 is provided below the plurality of steel balls 8a. The first member 81 of the rolling bearing 8 is biased by the valve spring 9 via the spring bearing 62, and the second member 82 abuts against the lower end (press-in member 63) of the holder main body 61, so that the rolling bearing 8 is prevented from coming off the valve holder 6. The rod shaft 22 and the first member 81 of the rolling bearing 8 are not limited to being integrally connected, but may be formed as separate bodies and joined by an appropriate joining means.

In the motor-operated valve of this embodiment, the biasing force of the valve spring 9 is transmitted to the first member 81 of the rolling bearing 8 and the valve body 2 via the spring bearing 62, and the spring bearing 62 and the first member 81 slide against each other, so that the rotational force of the rotor shaft 32 is hardly transmitted to the valve body 2. In addition, when the needle portion 21 of the valve body 2 is seated on the valve seat portion 13, the valve spring 9 contracts, so that excessive pressing force is not applied to the needle portion 21. Therefore, the motor-operated valve of this embodiment can achieve the same effect as the motor-operated valve 10 of the first embodiment.

Next, a motor-operated valve according to a fourth embodiment of the present invention will be described with reference to FIG. 5. The motor-operated valve of this embodiment, like the motor-operated valve of the third embodiment, comprises a valve body 1, a valve element 2, a valve holder 6, and a stepping motor 3 as a drive unit. In the motor-operated valve of this embodiment, a portion of the configuration of the valve holder 6 differs from that of the motor-operated valve of the third embodiment. The differences will be described in detail below.

The motor-operated valve of this embodiment differs from the third embodiment in that there is no flange 32b at the lower end of the rotor shaft 32, there is no insertion hole 61a on the upper side of the holder body 61 of the valve holder 6, and the lower end of the rotor shaft 32 and the center of the upper surface of the holder body 61 are formed integrally. The first member 81 of the rolling bearing 8 is formed integrally with the rod shaft 22 of the valve body 2, and the first member 81 is biased by the valve spring 9 via the spring bearing 62, as in the third embodiment.

In the valve holder 6 of the motor-operated valve of this embodiment, as in the second embodiment, the linear distance between the screw feed mechanism 16 and the rolling bearing 8 (distance indicated by A in FIG. 5) is large, and since there are no gaps such as holes communicating with the inside on the upper surface of the holder body 61, the distance along the surface of the holder 6 between the screw feed mechanism 16 and the rolling bearing 8 (distance indicated by B in FIG. 5), where shavings and the like are generated, can be further increased, so that malfunctions in operation caused by impurities getting into the rolling bearing 8 can be suppressed more than in the motor-operated valve of the third embodiment.

In the embodiment of Figures 4 and 5, the rolling bearing 8 is illustrated as being formed in a disk shape with the first member 81 integral with the rod shaft 22 of the valve body 2, but this is not limited thereto. As long as the upper convex portion of the first member 81 abuts against the spring bearing 62, the first member 81 may be a separate member from the valve body 2 that is fitted to the rod shaft 22.

Next, a motor-operated valve according to a fifth embodiment of the present invention will be described with reference to FIG. 6. The motor-operated valve of this embodiment, like the motor-operated valve 10 of the first embodiment, comprises a valve body 1, a valve element 2, a valve holder 6, and a stepping motor 3 as a drive unit. In the motor-operated valve of this embodiment, a portion of the configuration of the valve holder 6 differs from that of the motor-operated valve 10 of the first embodiment. The differences will be described in detail below.

In the motor-operated valve 10 of this embodiment, there is no flange 32b at the lower end of the rotor shaft 32, and there is no through hole 61a on the upper side of the holder body 61 of the valve holder 6. The lower end of the rotor shaft 32 and the center of the upper surface of the holder body 61 are integrally formed, and further, most of the lower side of the rod shaft 22 of the valve body 2 is located outside the holder body 61. The second member 82 of the rolling bearing 8 is fixed inside the holder body 61. The valve spring 9 is provided in a compressed state between the needle portion 21 of the valve body 2 and the first member 81 of the rolling bearing 8, and the valve body 2 is biased downward relative to the valve holder 6 and the rolling bearing 8. The rod shaft 22 of the valve body 2 is inserted into the first member 81 of the rolling bearing 8, and the valve body 2 is supported so as to be displaceable along the axial direction L.

In the valve holder 6 of the motor-operated valve of this embodiment, as in the motor-operated valve of the second embodiment, the linear distance between the screw feed mechanism 16 and the rolling bearing 8 (distance indicated by A in FIG. 6) is increased, and since the lower end of the rotor shaft 32 and the holder body 61 of the valve holder 6 are integrally formed, there are no gaps such as holes communicating with the inside on the upper surface of the holder body 61, so the distance along the surface of the holder 6 between the screw feed mechanism 16 and the rolling bearing 8 (distance indicated by B in FIG. 6), where shavings and the like are generated, can be further increased, so that malfunctions in operation caused by impurities such as shavings of the screw feed mechanism 16 entering the inside of the rolling bearing 8 can be further suppressed.

Next, the refrigeration cycle system of the present invention will be described with reference to FIG. 7. FIG. 7 is a diagram showing an example of the refrigeration cycle system of the present invention. In FIG. 7, reference numeral 100 denotes an expansion valve using the motor-operated valve 10 of each of the above-mentioned embodiments, 200 denotes an outdoor heat exchanger mounted on an outdoor unit, 300 denotes an indoor heat exchanger mounted on an indoor unit, 400 denotes a flow path switching valve constituting a four-way valve, and 500 denotes a compressor. The motor-operated valve 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are each connected by conduits as shown in the figure, constituting a heat pump type refrigeration cycle. Note that the accumulator, pressure sensor, temperature sensor, etc. are omitted from the illustration.

The flow path of the refrigeration cycle is switched between two paths, one for cooling operation and one for heating operation, by the flow path switching valve 400. During cooling operation, as shown by the solid arrows in Figure 7, the refrigerant compressed by the compressor 500 flows from the flow path switching valve 400 into the outdoor heat exchanger 200, which functions as a condenser, and the liquid refrigerant flowing out of the outdoor heat exchanger 200 flows into the indoor heat exchanger 300 via the expansion valve 100, which functions as an evaporator.

On the other hand, during heating operation, as shown by the dashed arrows in Figure 7, the refrigerant compressed by the compressor 500 is circulated from the flow path switching valve 400 to the indoor heat exchanger 300, the expansion valve 100, the outdoor heat exchanger 200, the flow path switching valve 400, and then to the compressor 500, with the indoor heat exchanger 300 functioning as a condenser and the outdoor heat exchanger 200 functioning as an evaporator. The expansion valve 100 reduces the pressure and expands the liquid refrigerant flowing in from the outdoor heat exchanger 200 during cooling operation, or the liquid refrigerant flowing in from the indoor heat exchanger 300 during heating operation, and further controls the flow rate of the refrigerant. In FIG. 7, the expansion valve 100 is provided in the refrigeration cycle so that liquid refrigerant from the outdoor heat exchanger 200 flows into the first joint pipe 101 of the expansion valve 100 during cooling operation, and liquid refrigerant from the indoor heat exchanger 300 flows into the second joint pipe 102 of the expansion valve 100 during heating operation. However, the present invention is not limited to this. The expansion valve 100 may be provided in the refrigeration cycle so that liquid refrigerant from the outdoor heat exchanger 200 flows into the second joint pipe 102 of the expansion valve 100 during cooling operation, and liquid refrigerant from the indoor heat exchanger 300 flows into the first joint pipe 101 of the expansion valve 100 during heating operation.

As described above, according to the refrigeration cycle system of the present invention, the motor-operated valve 10 of this embodiment can reduce the risk of operational malfunctions caused by impurities such as shavings from the screw feed mechanism 16 entering the inside of the rolling bearing, resulting in a refrigeration cycle system that is less likely to experience operational malfunctions during operation.

The above describes in detail the first to fifth embodiments of the present invention with reference to the drawings, but the specific configuration is not limited to these embodiments, and design changes that do not deviate from the gist of the present invention are included in the present invention.

For example, in the first to fifth embodiments described above, the motor-operated valve 10 is used as an expansion valve in a refrigeration cycle system, but the present invention is not limited to this and can also be applied to other systems, such as a throttling device on the indoor unit side of a multi-air conditioner for a building.

REFERENCE SIGNS LIST 10 Motor-operated valve 1 Valve body 1A Valve housing member 1C Valve chamber 2 Valve body 21 Needle portion 3 Stepping motor (drive portion)
6 Valve holder 61 Holder body 62 Spring bearing 8 Rolling bearing 81 First member 82 Second member 8a Steel ball (rolling member)
9 Valve spring 13 Valve seat portion 14 Valve port 16 Screw feed mechanism 32 Rotor shaft (rotating shaft)
100 Expansion valve 200 Outdoor heat exchanger (condenser, evaporator)
300 Indoor heat exchanger (condenser, evaporator)
400 Flow path switching valve 500 Compressor

Claims (7)

an electrically operated valve comprising: a valve body which defines a valve chamber and a valve seat; a valve element which moves axially towards and away from the valve seat to change an opening degree of a valve port; a drive unit which rotationally drives a rotary shaft; a screw feed mechanism which converts the rotational motion of the rotary shaft into linear motion in the axial direction and transmits the linear motion to the valve element; a valve holder which spans between the valve element and the rotary shaft; and a valve spring which biases the valve element in a valve closing direction,
The valve body is connected to the valve holder via a rolling bearing in a state in which the valve body is axially engaged only by the rolling bearing ,
2. The motor-operated valve according to claim 1, wherein when the rotary shaft moves further in the valve closing direction after the valve body is closed, the rolling bearing and the valve body are subjected to the biasing force of the valve spring. The motor-operated valve according to claim 1, characterized in that the valve holder has an insertion hole through which the tip of the rotating shaft is inserted and is engaged with the tip of the rotating shaft so as to be capable of relative rotation. The motor-operated valve according to claim 1, characterized in that the tip of the rotating shaft and the valve holder are integrally formed or joined to each other. The motor-operated valve according to any one of claims 1 to 3, characterized in that the rolling bearing has a first member attached to the valve body or formed integrally with the valve body, and a second member connected to the first member via a rolling member, and the first member is biased by the valve spring via a spring bearing. The motor-operated valve according to any one of claims 1 to 3, characterized in that the rolling bearing has a second member attached to the valve holder or formed integrally with the valve holder, and a first member connected to the second member via a rolling member, and the valve body is guided by the first member and biased against the first member by the valve spring. an electrically operated valve comprising: a valve body which defines a valve chamber and a valve seat; a valve element which moves axially towards and away from the valve seat to change an opening degree of a valve port; a drive unit which rotationally drives a rotary shaft; a screw feed mechanism which converts the rotational motion of the rotary shaft into linear motion in the axial direction and transmits the linear motion to the valve element; a valve holder which spans between the valve element and the rotary shaft; and a valve spring which biases the valve element in a valve closing direction,
The valve body is connected to the valve holder via a rolling bearing in a state in which the valve body is axially engaged only by the rolling bearing ,
The rolling bearing has a first member attached to the valve body or formed integrally with the valve body, and a second member connected to the first member via a rolling member, and the second member is biased by the valve spring. A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, characterized in that the motor-operated valve according to any one of claims 1 to 6 is used as the expansion valve.

Images