JP7199335B2 - Electric valve and refrigeration cycle system - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electrically operated valve and a refrigeration cycle system used in a refrigeration cycle system and the like.

2. Description of the Related Art Conventionally, as a motor-operated valve provided in a refrigeration cycle of an air conditioner, for example, there is one disclosed in Japanese Patent Laying-Open No. 2013-234726 (Patent Document 1). In the motor-operated valve disclosed in Patent Document 1, a first valve port and a second valve port are formed in a valve housing, and the flow of refrigerant at the valve ports is stabilized to reduce the noise of the motor-operated valve.

JP 2013-234726 A

In the electric valve disclosed in Patent Document 1, the shape of the valve throttle portion (that is, the shape of the valve port) is changed to reduce the refrigerant passage noise. However, improvement in the structure of the constricted portion alone may not sufficiently improve the sound due to restrictions on the configuration of parts and the shape of the piping, and there is still room for improvement as a noise countermeasure.

An object of the present invention is to provide an electrically operated valve and a refrigeration cycle system in which noise such as refrigerant passage noise in a secondary joint pipe is reduced.

In the motor operated valve of the present invention, a first joint pipe and a second joint pipe are respectively communicated with a valve chamber of a valve body, and one of the first and second joint pipes is a primary valve through which a fluid flows. In a motor-operated valve configured to have a side joint pipe and a secondary side joint pipe through which fluid flows out, a long cylindrical straightening pipe portion communicates with the valve chamber and protrudes into the secondary side joint pipe. wherein the secondary side joint pipe has a straight pipe portion connected to the valve body and a curved pipe portion bent from the straight pipe portion, and an end portion of the rectifying pipe portion is connected to the secondary It is arranged to face the curved tube portion of the side joint pipe, and the end portion of the rectifying tube portion is positioned closer to the curved tube than the boundary between the straight tube portion and the curved tube portion of the secondary side joint pipe. It is characterized by being arranged on the part side .

Further, the inner diameter "d" of the inner passage of the rectifying tube portion and the inner diameter "D" of the straight pipe portion of the secondary joint pipe are
d≧D/2
A motor-operated valve characterized by the relationship of

Further, it is preferable that the motor-operated valve is characterized in that the first joint pipe and the second joint pipe are connected to the valve main body so as to intersect each other with respect to the valve chamber.

Further, it is preferable that the electric valve is characterized in that the inner passage of the rectifying pipe portion constitutes a valve port that opens to the valve chamber and whose opening area is increased or decreased by a valve member.

A refrigerating cycle system of the present invention includes a compressor, a condenser, an expansion valve, and an evaporator, and is characterized in that the motor-operated valve is used as the expansion valve. do.

According to the electrically operated valve of the present invention, since the end of the straightening tube portion faces the inner wall of the curved tube portion, the fluid flowing out of the straightening tube portion collides with the inner wall of the curved tube portion of the secondary joint pipe. It will be done. Therefore, the speed of the fluid flowing through the secondary joint pipe is decelerated, and noise is reduced.

Further, according to the refrigeration cycle system of the present invention, the speed of the fluid flowing through the secondary side joint pipe is decelerated and noise is reduced, as with the motor-operated valve.

1 is a vertical cross-sectional view of a main part of an electrically operated valve according to a first embodiment of the present invention; FIG. FIG. 2 is an enlarged cross-sectional view of the main part of the motor-operated valve in the first embodiment; FIG. 7 is a vertical cross-sectional view of a main part of an electrically operated valve according to a second embodiment of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the refrigerating-cycle system of embodiment of this invention.

Next, an embodiment of an electrically operated valve and a refrigeration cycle system of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a main part of a motor-operated valve according to a first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of the same motor-operated valve. Note that the concept of "up and down" in the following description corresponds to up and down in the drawing of FIG.

A motor-operated valve 10 of this embodiment has a valve housing 1 as a "valve body" formed by cutting a metal member such as stainless steel or brass, and a valve chamber 1A is formed in the valve housing 1. ing. Further, the valve housing 1 is formed with a first port 11, a second port 12 and a third port 13, and a first tapered portion 14 is formed between the first port 11 and the second port 12, A second tapered portion 15 is formed between the second port 12 and the third port 13 . Furthermore, a first joint pipe 21 communicating with the valve chamber 1A from the side surface side is attached to the valve housing 1, and a second joint pipe 22 is attached to one end of the valve chamber 1A in the direction of the axis X. there is Through the first port 11, the first tapered portion 14, the second port 12, the second tapered portion 15 and the third port 13, the valve chamber 1A and the second joint pipe 22 are electrically connected. .

At the lower end of the valve housing 1, an elongated cylindrical rectifier tube portion 20 is formed to protrude into the second joint tube 22. As shown in FIG. The first port 11, the second port 12, the third port 13, the first tapered portion 14, and the second tapered portion 15 constitute a "valve port" having a circular cross-sectional shape centered on the axis X. , this “valve port” passes through the rectifier tube section 20 . Note that the relationship between the straightening pipe portion 20 and the second joint pipe 22 will be described later.

A valve guide member 23 is attached to the valve housing 1 by press-fitting and caulking so as to be inserted into the valve chamber 1A from above, and a valve guide hole 23a is formed in the center of the valve guide member 23. . A rim 1a is formed at the upper end of the valve housing 1 so as to surround the outer periphery of the upper end of the valve guide member 23, and the valve housing 1 has a cylindrical case fitted to the outer periphery of the rim 1a. 24 is installed. The case 24 is fixed to the valve housing 1 by crimping the rim 1a and brazing the outer circumference of the bottom portion. Furthermore, the support member 3 is attached to the upper end opening of the case 24 via a fixing metal fitting 31 .

At the center of the support member 3, a female threaded portion 3a coaxial with the axis X of the first port 11, etc., and a threaded hole thereof are formed, and a cylindrical slide hole having a diameter larger than the outer circumference of the threaded hole of the female threaded portion 3a is formed. 3b is formed. A valve holder 4 is fitted in the slide hole 3b so as to be slidable in the direction of the axis X, and the valve holder 4 holds a needle valve 5 as a "valve member" at its lower portion.

The valve holder 4 has a boss portion 42 fixed to the lower end of a cylindrical portion 41 , and has a spring receiver 43 , a compression coil spring 44 , a washer 45 and a spacer 46 inside the cylindrical portion 41 . The needle valve 5 is made of a metal member such as stainless steel or brass. and a flange portion 53 which is formed. The needle valve 5 is inserted into the insertion hole 42 a of the boss portion 42 of the valve holder 4 and attached to the valve holder 4 with the flange portion 53 abutting against the boss portion 42 . Also, the rod portion 52 of the needle valve 5 is inserted through the valve guide hole 23 a of the valve guide member 23 .

A can 25 is airtightly fixed to the upper end of the case 24 by welding or the like, and a magnet rotor 61 whose outer periphery is magnetized with multiple poles and a rotor shaft 62 fixed to the center are provided in the can 25. It is The upper end of the rotor shaft 62 is rotatably fitted in a cylindrical guide 26 provided on the ceiling of the can 25 . A male threaded portion 62 a is formed on the rotor shaft 62 , and the male threaded portion 62 a is screwed into a female threaded portion 3 a formed on the support member 3 . A stator coil 63 is arranged on the outer periphery of the can 25 , and the magnet rotor 61 , rotor shaft 62 and stator coil 63 constitute the stepping motor 6 . When a pulse signal is applied to the stator coil 63, the magnet rotor 61 is rotated according to the number of pulses, and the rotor shaft 62 is rotated. A rotation stopper mechanism 27 for the magnet rotor 61 is provided on the outer periphery of the guide 26 .

In the valve holder 4, the compression coil spring 44 is attached between the spring bearing 43 and the flange portion 53 of the needle valve 5 with a predetermined load applied thereto. While contacting the lower end portion of the spacer 46 , the upper end portion of the cylindrical portion 41 presses the upper end portion of the spacer 46 via a washer 45 . The flange portion 62b of the rotor shaft 62 is engaged between the washer 45 and the spacer 46, and is retained by the washer 45. As shown in FIG. As a result, the needle valve 5 is connected to the rotor shaft 62 via the valve holder 4, and is movable in the direction of the axis X as the rod portion 52 is guided.

With the above configuration, when the stepping motor 6 is driven, the magnet rotor 61 and the rotor shaft 62 are rotated. moves in the direction of the axis X. Due to the movement of the rotor shaft 62 in the X-axis direction accompanying this rotation, the needle valve 5 moves in the X-axis direction together with the valve holder 4 . As described above, the needle valve 5 advances and retracts the first port 11 in the direction of the axis X while the needle portion 51 is inserted into the first port 11 to increase or decrease the opening area of the first port 11 . Then, the flow rate of the fluid (refrigerant) flowing from the first joint pipe 21 to the second joint pipe 22 is controlled. That is, in this example, the first joint pipe 21 is the primary joint pipe, and the second joint pipe 22 is the secondary joint pipe.

As shown in FIG. 2, the second joint pipe 22, which is the secondary joint pipe, includes a straight pipe portion 22A connected to the valve housing 1 and a curved portion that intersects the straight pipe portion 22A (axis X). A portion beyond the curved tube portion 22B extends in a direction parallel to the first joint pipe 21 (a direction perpendicular to the axis X). An end portion 20a of the rectifying tube portion 20 in the direction of the axis L is positioned within the bending tube portion 22B by a length "H" from the boundary between the straight tube portion 22A and the curved tube portion 22B. The end portion 20a of the tube portion 20 is configured so as not to contact the tube wall within the curved tube portion 22B.

In this way, since the end 20a of the rectifier tube portion 20 in the direction of the axis L faces the inner wall of the curved tube portion 22B, the fluid flowing out from the third port 13 of the rectifier tube portion 20 flows through the second joint pipe. 22 collides with the inner wall of the curved pipe portion 22B and flows through the second joint pipe 22. As shown in FIG. Therefore, the speed of the fluid flowing through the second joint pipe 22 is reduced, and noise is reduced. In addition, since the second joint pipe 22 is bent laterally with respect to the rectifying pipe portion 20, even when the fluid (refrigerant) flows from the second joint pipe 22 to the first joint pipe 21, the bending The flow velocity of the refrigerant reaching the straightening tube portion 20 is reduced by the tube portion 22B, and noise is reduced.

Further, the inner diameter "d" of the third port 13 and the inner diameter "D" of the straight pipe portion 22A are
d≧D/2
It is preferable to have a relationship of In this way, by making the inner diameter of the third port 13 projecting into the curved pipe portion 22B larger than the radius of the inner diameter of the straight pipe portion 22A (second joint pipe 22), the fluid flowing out from the third port 13 is It becomes easy to collide with the inner wall of the second joint pipe 22 . This makes it easier to slow down the flow velocity of the fluid and enhances the noise reduction effect.

It should be noted that the outer diameter of the straightening tube portion 20 can be increased to such an extent that it does not come into contact with the inner wall of the second joint tube 22 . By preventing the outer diameter of the rectifying tube portion 20 from contacting the inner wall of the second joint pipe, the fluid that flows out from the opening of the third port 13 and collides with the inner wall of the curved tube portion 22B (second joint pipe 22) A decrease in the flow rate due to reverse flow into the third port 13 can be suppressed.

In this embodiment, the bending tube portion 22B is bent so as to extend in the same direction as the first joint 21. In addition, the bending direction of the curved tube portion 22B is, for example, substantially perpendicular to the straight tube portion 22A, so that the fluid flowing out of the rectifying tube portion 20 collides with the inner wall of the curved tube portion 22B. It may be bent in any direction as long as it is a direction. In particular, it is preferable to select the bending direction of such a curved tube portion according to the configuration of, for example, the piping of the refrigeration cycle system.

FIG. 3 is a vertical cross-sectional view of a main part of a motor-operated valve according to a second embodiment of the present invention. 21' is a motor-operated valve with a specification that serves as a secondary side joint pipe. Also in this second embodiment, the configuration other than the first joint pipe 21', the second joint pipe 22', and the rectifying pipe portion 20' shown in FIG. 3 is the same as in FIG.

In the second embodiment, a first joint pipe 21', which is a secondary joint pipe, includes a straight pipe portion 21A' connected to the valve housing 1 and a curved portion intersecting the straight pipe portion 21A'. It has a curved tube portion 21B', and a portion beyond this curved tube portion 21B' extends in a direction parallel to the second joint tube 21 (axis X direction). Further, a rectifying pipe portion 20' is provided so as to communicate with the valve chamber 1A. An end portion 20a' of the rectifying tube portion 20' in the direction intersecting with the axis L is located inside the curved tube portion 21B' from the boundary between the straight tube portion 21A' and the curved tube portion 21B'. Further, the end portion 20a' of the rectifying tube portion 20' is constructed so as not to come into contact with the tube wall inside the curved tube portion 21B'.

In this second embodiment as well, the fluid flowing out from the valve chamber 1A through the rectifying pipe portion 20' into the first joint pipe 21' collides with the inner wall of the curved pipe portion 21B' of the first joint pipe 21', It flows through this first joint pipe 21'. Therefore, the speed of the fluid flowing through the first joint pipe 21' is reduced and the noise is reduced.

Also, in the second embodiment, as in the first embodiment, the bending direction of the curved tube portion 21B' is substantially perpendicular to the straight tube portion 21A'. It may be bent in any direction as long as the fluid flowing out from the tube collides with the inner wall of the curved tube portion 21B'. Moreover, it is preferable to select the bending direction of the curved tube portion according to the configuration of the piping of the refrigeration cycle system, for example.

In the above-described first embodiment, an example in which the second joint pipe is provided with the curved pipe portion is shown, and in the second embodiment, an example in which the first joint pipe is provided with the curved pipe portion is shown. Both the first joint pipe and the second joint pipe are provided with rectifying pipe portions, and the first joint pipe and the second joint pipe are connected so that the inner walls face the ends of the rectifying pipe portions. A motor-operated valve having curved pipe portions on both sides may also be used.

FIG. 4 is a diagram showing a refrigeration cycle system of the embodiment, which is an example of a refrigeration cycle system for an air conditioner. The air conditioner includes an electric valve 10 as an expansion valve, an outdoor heat exchanger 20 mounted in an outdoor unit 100, an indoor heat exchanger 30 mounted in an indoor unit 200, a flow path switching valve 40, a compressor 50, and each of these elements is connected by conduits as shown in the drawing to form a heat pump refrigeration cycle system. This refrigerating cycle system is one example of a refrigerating cycle system to which the motor-operated valve of the present invention is applied, and the motor-operated valve of the present invention can also be applied to other systems such as a throttle device on the indoor unit side of multi-air conditioners for buildings. be able to.

The flow path of the refrigeration cycle system is switched between two flow paths for heating mode and cooling mode by a flow path switching valve 40. In the heating mode, as indicated by solid line arrows, the refrigerant compressed by the compressor 50 flows through the flow path. Refrigerant flowing from the switching valve 40 into the indoor heat exchanger 30 and flowing out from the indoor heat exchanger 30 flows through the conduit 60 into the motor-operated valve 10 . Refrigerant is expanded by the motor-operated valve 10 and circulated through the outdoor heat exchanger 20, the flow path switching valve 40, and the compressor 50 in this order. In the cooling mode, the refrigerant compressed by the compressor 50 flows into the outdoor heat exchanger 20 through the flow path switching valve 40, and the refrigerant flowing out of the outdoor heat exchanger 20 flows through the motor-operated valve 10, as indicated by the dashed arrow. After being expanded, it flows through the conduit 60 and into the indoor heat exchanger 30 . The refrigerant that has flowed into the indoor heat exchanger 30 flows into the compressor 50 via the flow path switching valve 40 . In the example shown in FIG. 4, the refrigerant flows from the primary joint pipe 21 of the motor-operated valve 10 to the secondary joint pipe 22 in the heating mode. Alternatively, the refrigerant may flow from the secondary joint pipe 22 to the primary joint pipe 21 .

The motor-operated valve 10 functions as an expansion valve (throttling device) that controls the flow rate of the refrigerant. In the heating mode, the outdoor heat exchanger 20 functions as an evaporator, the indoor heat exchanger 30 functions as a condenser, and the indoor Heating is provided. In the cooling mode, the outdoor heat exchanger 20 functions as a condenser and the indoor heat exchanger 30 functions as an evaporator to cool the room.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are made within the scope of the present invention. is included in the present invention.

1 Valve housing (valve body)
1A Valve chamber 11 First port (valve port)
12 Second port (valve port)
13 Third port (valve port)
14 first tapered portion (valve port)
15 Second tapered portion (valve port)
21 First joint pipe 22 Second joint pipe (secondary joint pipe)
22A straight tube portion 22B curved tube portion 20 rectifying tube portion 20a end portion 3 support member 4 valve holder 5 needle valve (valve member)
6 stepping motor 21' first joint pipe (secondary side joint pipe)
21A' straight pipe portion 21B' curved pipe portion 22' second joint pipe 20' rectifying pipe portion 20a' end portion 10 motor-operated valve 20 outdoor heat exchanger 30 indoor heat exchanger 40 flow path switching valve 50 compressor

Claims (5)

A first joint pipe and a second joint pipe communicate with the valve chamber of the valve body, and one of the first and second joint pipes is used as a primary side joint pipe into which fluid flows, and the other is used as a primary side joint pipe. In a motor-operated valve configured to serve as a secondary joint pipe through which fluid flows,
a long cylindrical rectifying pipe portion communicating with the valve chamber and protruding into the secondary side joint pipe, the secondary side joint pipe being provided with a straight pipe portion connected to the valve main body; and a curved tube portion curved from a portion, and an end portion of the rectifying tube portion is arranged to face the curved tube portion of the secondary joint tube ,
A motor-operated valve , wherein an end portion of the rectifying pipe portion is disposed closer to the curved pipe portion than a boundary between the straight pipe portion and the curved pipe portion of the secondary joint pipe . The inner diameter "d" of the inner passage of the rectifying tube portion and the inner diameter "D" of the straight tube portion of the secondary joint tube are
d≧D/2
2. The motor-operated valve according to claim 1 , wherein the relationship is: 3. The motor-operated valve according to claim 1, wherein the first joint pipe and the second joint pipe are connected to the valve body in directions that intersect each other with respect to the valve chamber. . 4. The inner passage of the rectifying pipe portion constitutes a valve port that opens to the valve chamber and whose opening area is increased or decreased by a valve member. electric valve. A refrigeration cycle system including 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. A refrigeration cycle system characterized by:

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