JP2021028505A - Electric valve and refrigeration cycle system - Google Patents

Abstract

To suppress sound pressure level of fluid passing sound generated in an electric valve, in the electric valve.SOLUTION: A cylindrical rectification member 36 provided separately from a valve seat 31V, has a rectification stepped hole 36H on a common axis with a center axis of a valve body 23. The rectification stepped hole 36H is composed of an enlarging portion 36A formed concentrically with the center axis of the rectification member 36, and a contacting portion 36B communicated with the enlarging portion 36A. An inner diameter D3 of the enlarging portion 36A is set to a value that is larger than an inner diameter D1 of a valve port 31Va and an inner diameter D4 of the contracting portion 36B and is an inner diameter D2 of an enlarging portion 31Vb or more.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric valve and a refrigeration cycle system including the electric valve.

In the refrigeration cycle system, an electric valve is arranged between the condenser and the evaporator as an expansion valve. In recent years, as the noise of the compressor and fan has been reduced in the refrigeration cycle system, the fluid passing noise of the refrigerant passing through the piping and the electric valve has become remarkable, and the quietness of the electric valve having a relatively high refrigerant passing speed has been required. ing. In such an electric valve, for example, as shown in FIG. 11 in Patent Document 1, a rectifying unit is adjacent to a valve port of a valve body in order to reduce the sound pressure level of the passing sound of the refrigerant. Those provided in the joint have been proposed. The valve port of such a valve body is formed by a first port, a first taper portion, and a second port. At that time, the inner diameter of the second port is set to be larger than the inner diameter of the first port. Further, the inner diameter of the second port is set to be larger than the inner diameter of the cylindrical rectifying portion.

In such a configuration, the flow velocity of the refrigerant flowing into the first port from the first pipe joint connected to the valve body of the electric valve is set so that the inner diameter of the second port is larger than the inner diameter of the first port. Therefore, the speed is reduced, and the refrigerant is discharged into the second pipe joint via the rectifying section. At that time, the sound pressure level of the passing sound of the refrigerant is reduced.

On the other hand, the refrigerant that has passed through the rectifying section in the second pipe joint and has flowed toward the valve port of the valve body is first rectified by the rectifying section because the inner diameter of the rectifying section is smaller than the inner diameter of the second pipe joint. Next, the flow velocity of the refrigerant flowing into the second port of the valve body is decelerated because the inner diameter of the second port is set to be larger than the inner diameter of the cylindrical rectifying portion. At that time, the sound pressure level of the passing sound of the refrigerant passing through the second port is further reduced.

International Publication No. 2018/230159

However, when the refrigerant flows from the first pipe joint to the second port through the first port of the valve body, the flow velocity of the refrigerant may not be sufficiently decelerated between the second port and the rectifying section. In such a case, it is conceivable to set the length of the second port of the valve body along the flow direction of the refrigerant to be relatively large. However, such measures are not a good idea because the processing difficulty of the second port of the valve body becomes high.

In consideration of the above problems, the present invention is an electric valve, an electric valve including the electric valve, and an electric valve capable of suppressing the sound pressure level of the fluid passing sound generated in the electric valve. , Aim to provide a refrigeration cycle system equipped with it.

In order to achieve the above object, the electric valve according to the present invention has a first port connected to the first passage and a second port connected to the second passage. A valve body having a valve port communicating with a port and a second port, and having an accommodating portion for movably accommodating a valve body unit including a valve body which is close to or separated from the valve port and controls an opening area. Valve body unit drive mechanism that causes the valve body unit and the valve body unit to perform an operation of controlling the opening area of the valve body so as to adjust the flow rate of the fluid passing between the tip portion of the valve body and the peripheral edge of the valve body. And, in the valve seat adjacent to the second port facing the tip of the valve body, a valve port and an enlarged portion communicating with the valve port are formed on the second port side of the valve port, and further with the valve seat. Separately, the second port side of the valve seat is provided with a rectifying member having a stepped hole for rectifying, which faces the enlarged portion of the valve seat and whose inner diameter becomes smaller toward the second port. It is characterized by.

The rectifying stepped hole of the rectifying member is formed with an enlarged portion having a large inner diameter facing the enlarged portion of the valve seat, and a reduced portion having an inner diameter smaller than the inner diameter of the enlarged portion of the rectifying stepped hole facing the second port. Is formed, and the inner diameter of the enlarged portion of the rectifying stepped hole of the rectifying member may be set to a value equal to or larger than the inner diameter of the enlarged portion of the valve seat.

As the rectifying stepped hole of the rectifying member, two or more steps having different inner diameters whose inner diameters decrease from the valve seat side to the second port side may be formed on a common central axis.

When the valve body is fully lowered, the insertion length into the valve seat from the upper surface of the valve port of the valve seat to the tip of the valve body toward the second port side is the enlarged portion of the stepped hole for rectification of the rectifying member. Even if it is set to be less than or equal to the value of the sum of the length along the central axis of the second port and the length from the upper surface of the valve port of the valve seat to the opening end surface of the enlarged portion of the valve seat on the second port side. Good.

The minimum inner diameter of the reduced portion of the rectifying stepped hole of the rectifying member may be set to a value equal to or larger than the inner diameter of the valve port.

Further, a tapered surface may be formed at the boundary portion between the enlarged portion and the reduced portion of the stepped hole for rectification of the rectifying member.

The rectifying member has a flange portion that comes into contact with the end surface at which the enlarged portion of the valve seat opens, and a cylindrical portion that is connected to the flange portion, and has an inner peripheral surface and a cylindrical portion of a pipeline that forms a second port. A gap may be formed between the outer peripheral surface and the outer peripheral surface.

The refrigeration cycle system according to the present invention includes an evaporator, a compressor, and a condenser, and the above-mentioned electric valve is provided in a pipe arranged between the outlet of the condenser and the inlet of the evaporator. It is characterized in that it is provided.

According to the electric valve according to the present invention and the refrigeration cycle system including the electric valve, the valve seat adjacent to the second port facing the tip of the valve body is located on the valve port and the second port side of the valve port. An enlarged portion communicating with the valve seat is formed, and a rectifying member is provided on the second port side of the valve seat separately from the valve seat. The rectifying member faces the enlarged portion of the valve seat and has an inner diameter. A large enlarged portion is formed and has a stepped hole for rectification whose inner diameter becomes smaller toward the second port. By providing the rectifying member separately from the valve seat so that the enlarged portion of the rectifying member faces the enlarged portion of the valve seat in this way, the length of the enlarged portion can be lengthened without increasing the difficulty of processing. This lengthened enlarged portion makes it possible to sufficiently reduce the flow velocity of the fluid. Further, since the rectifying member has rectifying stepped holes whose inner diameter becomes smaller toward the second port, it is possible to suppress the sound pressure level of the fluid passing sound generated in the electric valve.

It is a partially enlarged sectional view of the part A in FIG. It is sectional drawing which shows the structure of an example of the electric valve which concerns on this invention. It is a figure which shows typically the structure of the example of the refrigeration cycle system to which an example of the electric valve which concerns on this invention is applied. It is a partial cross-sectional view provided for the operation explanation in the rectifying member shown in FIG. (A), (B), and (C) are partial cross-sectional views showing another example of the rectifying member used in the example of the electric valve according to the present invention, respectively. (A), (B), and (C) are partial cross-sectional views showing still another example of the rectifying member used in the example of the electric valve according to the present invention, respectively. (A) and (B) are partial cross-sectional views showing still another example of the rectifying member used in the example of the electric valve according to the present invention, respectively.

FIG. 2 shows a configuration of an example of an electric valve according to the present invention together with a pipe for piping.

The electric valve 3 as an example of the electric valve according to the present invention is, for example, as shown in FIG. 3, the outlet of the outdoor heat exchanger 6 and the indoor heat exchanger 2 during the cooling operation described later in the piping of the refrigeration cycle system. It is located between the entrance and the entrance. During the cooling operation, the electric valve 3 is joined to the primary side pipe Du1 by the connection pipe 32 described later, and is joined to the secondary side pipe Du2 by the connection pipe 34. The primary side pipe Du1 connects the outlet of the outdoor heat exchanger 6 to the electric valve 3, and the secondary side pipe Du2 connects the inlet of the indoor heat exchanger 2 to the electric valve 3. Between the outlet of the indoor heat exchanger 2 and the inlet of the outdoor heat exchanger 6, the pipe Du3 joined to the outlet of the indoor heat exchanger 2, the flow path switching valve 8, and the inlet of the outdoor heat exchanger 6 The pipe Du6 to be joined to is arranged. Further, the compressor 4 is joined to the flow path switching valve 8 by the pipe Du4 and the pipe Du5. The other end of the pipe Du3 is joined to the port 8b of the flow path switching valve 8. The other end of the pipe Du6 is joined to the port 8d of the flow path switching valve 8. One end of the pipe Du4 is joined to the port 8c of the flow path switching valve 8, and the other end of the pipe Du4 is joined to the suction port of the compressor 4. One end of the pipe Du5 is joined to the port 8a of the flow path switching valve 8, and the other end of the pipe Du5 is joined to the discharge port of the compressor 4. During the cooling operation, the port 8a and the port 8d are in communication with each other, and the port 8b and the port 8c are in communication with each other. As a result, during the cooling operation, the refrigerant in the refrigeration cycle system is circulated along the direction indicated by the arrow R shown in FIG. 3, for example, the outdoor heat exchanger 6 serves as a condenser, and the indoor heat exchanger 2 serves as an evaporator. Will function as. In the cooling operation, the electric valve 3 is joined to the primary side pipe Du1 by the connecting pipe 32, and is joined to the secondary side pipe Du2 by the connecting pipe 34. Not limited to the example, for example, during the cooling operation, the electric valve 3 may be joined to the primary side pipe Du1 by the connecting pipe 34 and to the secondary side pipe Du2 by the connecting pipe 32.

On the other hand, during the heating operation, the flow path switching valve 8 is switched so that the port 8a and the port 8b of the flow path switching valve 8 communicate with each other and the port 8c and the port 8d communicate with each other. As a result, during the heating operation, the refrigerant in the refrigeration cycle system is circulated along the direction indicated by the arrow F shown in FIG. 3, for example, the indoor heat exchanger 2 serves as a condenser, and the outdoor heat exchanger 6 serves as an evaporator. Will function as. The compressor 4 and the electric valve 3 are driven and controlled, and the flow path switching valve 8 is switched and controlled by a control unit (not shown).

As shown in FIG. 2, the electric valve is arranged in a cylindrical rotor case 20 to drive a valve body unit described later, and is connected to an end portion of the rotor case 20 and is connected to a tip portion of the valve body 23. A valve body including a valve body 31 having a valve seat 31V having a valve port close to or separated from the valve body 23 and a valve body 23 arranged in the valve body 31 and close to or separated from the valve port of the valve seat 31V. It is composed of a unit and.

The valve drive unit has a male screw shaft 14 for moving the valve body unit up and down, which will be described later, and a female screw portion 12B on which a female screw 12FMS fitted with the male screw shaft 14 is formed, and is fixed to the valve body 31 to provide the valve body unit. A guide support portion 12 that guides the rotor so as to be moved up and down, a rotor 10 that is fixed to the guide shaft portion 14A of the male screw shaft 14 and rotatably supported and magnetized, and a rotor 10 that is arranged on the outer peripheral portion of the rotor case 20 to rotate the rotor 10. It is configured to include a stator coil 40 as a main element.

The guide support portion 12 has a guide surface on the inner peripheral portion that guides the cylindrical valve body case 19 forming a part of the valve body unit so as to be able to move up and down.

The male thread shaft 14 is formed at the lower end of the male thread portion 14B and is formed at the lower end of the male thread portion 14B and is engaged with the peripheral edge of the through hole 19a of the valve body case 19 via a washer (not shown). It is composed of a connecting portion 14C and a guide shaft portion 14A formed at the upper end of the male screw portion 14B. The guide shaft portion 14A is rotatably supported in a cylindrical portion 20C that projects from the top of the rotor case 20 toward the guide support portion 12 along the central axis.

A spiral guide portion 11 is formed on the outer peripheral portion of the cylindrical portion 20C to guide the movable stopper piece 11B so as to move in the direction of the central axis of the cylindrical portion 20C while rotating. One end of the movable stopper piece 11B is locked to the protrusion of the rotor 10. Further, rotation stoppers 20US and 20LS of the movable stopper piece 11B are provided at the uppermost end portion and the lowermost end portion of the cylindrical portion 20C, respectively. As a result, when the movable stopper piece 11B comes into contact with the rotation stoppers 20US and 20LS, the movable stopper piece 11B is placed at a predetermined valve closing position and a predetermined valve opening (fully open) position of the valve body 23 described later. It is stopped at the corresponding predetermined rotation angle.

The valve drive unit described above is controlled by a drive control unit (not shown) based on a drive pulse signal supplied to the stator coil 40.

The valve body unit cooperates with a washer (not shown) with a needle-shaped valve body 23 that is close to or separated from the valve port 31V of the valve seat 31V, which will be described later, and an overhanging portion 14F of the connecting portion 14C of the male screw shaft 14. A columnar resin spring receiving member 24 that engages with the inner peripheral edge of the open end 19T of the valve body case 19, an overhanging portion 24T of the spring receiving member 24, and a flat spring receiving member at one end of the valve body 23. A cylindrical valve body case 19 that accommodates a coil spring 22 that is arranged between the portions and urges them in a direction that separates them from each other, a spring receiving member 24, a coil spring 22, and one end of a valve body 23. And are included as the main elements.

One end of the cylindrical valve body case 19 near the valve seat 31V is closed by fixing the outer peripheral portion of one end of the valve body 23. The other side of the cylindrical valve body case 19 is an open end portion 19T having a hole 19a through which a reduced diameter portion for positioning a washer in the connecting portion 14C of the male screw shaft 14 passes. Therefore, the washer is arranged between the inner peripheral edge of the open end portion 19T of the valve body case 19 and one end surface of the overhanging portion 14F.

The outer peripheral portion of the cylindrical valve body case 19 is slidably contacted with the guide surface of the guide support portion 12 described above and is supported so as to be able to move up and down. As a result, the tip end (needle portion) of the other end of the valve body 23 is inserted into the valve port 31Va of the valve seat 31V, and the outer peripheral surface of the needle portion of the valve body 23 hits the peripheral edge of the opening of the valve port 31Va. After the contact, when the male screw shaft 14 is continuously lowered, the coil spring 22 is compressed by a predetermined amount. As a result, the outer peripheral surface of the needle portion 23E of the valve body 23 is pressed against the peripheral edge of the opening of the valve port 31V by the spring force of the coil spring 22. As a result, the valve port 31Va of the valve seat 31V is closed. It should be noted that the valve body may not be brought into contact with the opening peripheral edge of the valve port when the valve body is in the lowest lowered state, so that a minute flow rate may be obtained even when the valve body is in the lowest lowered state.

The valve body 31 is made of a metal material such as brass, stainless steel, aluminum alloy, or a resin material, and has a lower end below the female thread 12B in the guide support 12, the other end of the valve body 23, and a cylinder. The valve body accommodating portion 31A for accommodating the shaped valve body case 19 is provided inside. The other end of the valve body 23 projects from the valve body accommodating portion 31A toward the valve port 31Va. Further, the valve body accommodating portion 31A has a first port 32P to which one end of a connection pipe 32 as a first passage is connected on an axis substantially orthogonal to the central axis of the valve body 23, and the valve body 23. A valve seat 31V adjacent to the second port 34P, to which one end of the connecting pipe 34 as the second passage is connected, is formed on an axis common to the central axis of the above.

The valve seat 31V has a valve port 31V on an axis common to the central axis of the valve body 23 and a valve port 31V on the second port 34P side of the valve port 31V, as shown partially enlarged in FIG. It has an enlarged portion 31Vb that communicates with the above. The inner peripheral edge of the valve port 31Va and the inner peripheral edge of the adjacent enlarged portion 31Vb are connected by an annular tapered surface 31Vt.

The upper end surface of the metal rectifying member 36 inserted into the second port 34P of the connecting pipe 34 is in contact with the end surface of the valve seat 31V where the enlarged portion 31Vb opens. The outer peripheral surface of the rectifying member 36 is fixed to the inner peripheral surface of the connecting pipe 34.

As shown in an enlarged view in FIG. 1, the cylindrical rectifying member 36 has a rectifying stepped hole 36H on an axis common to the central axis of the valve body 23. The stepped hole 36H for rectification is formed on the enlarged portion 36A concentrically with the central axis of the rectifying member 36 and on the enlarged portion 36A facing the above-mentioned enlarged portion 31Vb, and on the second port 34P side of the enlarged portion 36A. It is composed of a reduction unit 36B that communicates with the device. The inner diameter D3 of the expansion portion 36A is set to a value larger than the inner diameter D1 of the valve port 31Va and the inner diameter D4 of the reduction portion 36B and equal to or larger than the inner diameter D2 of the expansion portion 31Vb, for example. Further, the inner diameter D4 of the reduced portion 36B is set to a value equal to or larger than the inner diameter D1 of the valve port 31Va. The length L3 along the central axis of the enlarged portion 36A is set to a value larger than the length L2 from the tapered surface 31Vt along the central axis to the end surface of the enlarged portion 31Vb. The length L6 along the central axis of the reduction portion 36B is set to a value larger than the orifice length L1 of the valve port 31Va. As shown in FIG. 1, the distance La from the upper surface of the valve port of the valve seat 31V to the boundary between the enlarged portion 36A and the reduced portion 36B of the rectifying member 36 is, for example, the rectifying member from the upper surface of the valve port of the valve seat 31V. It is set to be about 91% or less with respect to the distance Lb to the end face of 36. This ratio is set so that, for example, the refrigerant actually flows through the valve port 31Va, the expansion portion 31Vb, and the stepped hole 36H for rectification, and the sound pressure level of the passing sound is minimized while detecting the passing sound of the refrigerant. Has been done.

In such a configuration, the stator coil 40 of the valve drive unit is controlled by the drive pulse signal from the drive control unit, and the valve body 23 is moved up and down to supply the fluid through the connection pipe 32 or the connection pipe 34. A predetermined amount of the refrigerant is passed through a gap flow path formed between the inner peripheral surface forming the valve port 31Va of the valve seat 31V and the needle portion 23E of the valve body 23 along the direction indicated by the arrow F or the arrow R. It will pass by the flow rate.

In this way, the inner diameter D3 of the enlarged portion 36A of the rectifying member 36 is set to a value equal to or greater than the inner diameter D2 of the enlarged portion 31Vb, and the length L3 along the central axis of the enlarged portion 36A is from the tapered surface 31Vt along the central axis. By setting a value larger than the length L2 to the end face of the enlarged portion 31Vb, the deceleration region in the enlarged portion 31Vb is expanded, so that the cavitation burst is suppressed and the sound pressure of the passing sound of the refrigerant is suppressed. The level is suppressed. As a result, as shown in FIG. 4, for example, the flow ST1 flowing in through the valve port 31V becomes the flow ST2 decelerated by the enlarged portion 31Vb, and further, the flow ST3 that cannot be decelerated completely on the valve seat 31V side becomes. The speed is reduced by the flow path (expanded portion 36A) on the rectifying member 36 side, and cavitation bursts, but the flow velocity decelerates for a long distance, so that the effect is difficult to reach the reduced portion 36B of the rectifying member 36. Then, after the flow ST4 is rectified, the discharged flow ST5 is discharged into the second port 34P.

By setting the inner diameter D4 of the reduction portion 36B to be equal to or larger than the inner diameter D1 of the valve port 31V and smaller than the inner diameter D3 of the expansion portion 36A, the turbulent flow of the refrigerant in the reduction portion 36B is rectified. Therefore, the sound pressure level of the passing sound of the refrigerant is suppressed. Further, the length L6 along the central axis of the reduced portion 36B is set to a value larger than the orifice length L1 of the valve port 31Va, so that the flow of the refrigerant is stably rectified.

Further, the value of the sum of the length L4 from the upper surface of the valve port of the valve seat 31V to the open end surface of the enlarged portion 31Vb and the length L3 of the enlarged portion 36A is the value of the needle portion of the valve body 23 from the upper surface of the valve port of the valve seat 31V. Since the length to the lower end of the 23E, that is, the insertion length L5 of the needle portion 23E into the valve seat 31 or more is set, even when the minute flow rate is controlled, the needle portion 23E is preceded by the tip ( (Lower side) Since the enlarged portion 36A of the rectifying member 36 is formed, the sound pressure level of the passing sound of the refrigerant is suppressed regardless of the position of the needle portion 23E.

5 (A), (B), and (C) show another example of the rectifying member used in the example of the electric valve according to the present invention, respectively. 5 (A), (B), and (C), and 6 (A), (B), and (C), 7 (A), and (B), which will be described later, are shown in FIGS. The same components as the components in the example shown in 1 are designated by the same reference numerals, and the duplicate description thereof will be omitted.

In FIG. 5A, the cylindrical metal rectifying member 46 has a rectifying stepped hole 46H on an axis common to the central axis of the valve body 23. The rectifying stepped hole 46H is composed of an expanding portion 46A formed concentrically with the central axis of the rectifying member 46 and facing the expanding portion 31Vb, and a reducing portion 46B communicating with the expanding portion 46A. A tapered surface 46t is formed at the boundary between the enlarged portion 46A and the reduced portion 46B. The inner diameter of the enlarged portion 46A and the inner diameter of the enlarged portion 31Vb are set to the same value. The inner diameter of the enlarged portion 46A is set to be larger than the inner diameter of the reduced portion 46B. The lengths of the enlarged portion 46A and the reduced portion 46B along the central axis are set in the same manner as in the example shown in FIG.

In FIG. 5B, the cylindrical metal rectifying member 48 has a rectifying stepped hole 48H on an axis common to the central axis of the valve body 23. The rectifying stepped hole 48H is composed of an expanding portion 48A formed concentrically with the central axis of the rectifying member 48 and facing the expanding portion 31Vb, and a reducing portion 48B communicating with the expanding portion 48A. A tapered surface as shown in FIG. 5A is not formed at the boundary portion between the enlarged portion 46A and the reduced portion 46B. The inner diameter of the enlarged portion 48A and the inner diameter of the enlarged portion 31Vb are set to the same value. The inner diameter of the enlarged portion 48A is set to be larger than the inner diameter of the reduced portion 48B. The lengths of the enlarged portion 48A and the reduced portion 48B along the central axis are set in the same manner as in the example shown in FIG.

In FIG. 5C, the cylindrical metal rectifying member 50 has a rectifying stepped hole 50H on an axis common to the central axis of the valve body 23. The rectifying stepped hole 50H includes an expanding portion 50A1 facing the expanding portion 31Vb formed concentrically with the central axis of the rectifying member 50, and a reducing portion 50B having an opening end opened in the second port 34P. It is composed of a tapered portion 50A2 that connects the enlarged portion 50A and the reduced portion 50B. The inner diameter of the enlarged portion 50A1 and the inner diameter of the enlarged portion 31Vb are set to the same value. The inner diameter of the enlarged portion 50A1 is set to be larger than the inner diameter of the reduced portion 50B. The lengths of the enlarged portion 50A1 and the reduced portion 50B along the central axis are set in the same manner as in the example shown in FIG.

6 (A), (B), and (C) show still another example of the rectifying member used in the example of the electric valve according to the present invention, respectively. The rectifying members 52, 54, and 56 shown in FIGS. 6 (A), 6 (B), and (C) each have a plurality of stages of rectifying stepped holes. This causes the generation of a vortex by increasing the separation point of the flow of the refrigerant in the rectifying member, thereby reducing the sound pressure level of the passing sound of the refrigerant in the rectifying member.

In FIG. 6A, the cylindrical metal rectifying member 52 has a two-stage rectifying stepped hole 52H on an axis common to the central axis of the valve body 23. The rectifying stepped hole 52H has a first expanding portion 52A1 facing the expanding portion 31Vb formed concentrically with the central axis of the rectifying member 52 and a second expanding portion 52A2 communicating with the first expanding portion 52A1. And a reduction unit 52B communicating with the expansion unit 52A2. The inner diameter of the first enlarged portion 52A1 is set to be larger than the inner diameter of the enlarged portion 31Vb, the second enlarged portion 52A2, and the reduced portion 52B. The inner diameter of the second enlarged portion 52A2 is set to be larger than the inner diameter of the reduced portion 52B.

In FIG. 6B, the cylindrical metal rectifying member 54 has a three-stage rectifying stepped hole 54H on an axis common to the central axis of the valve body 23. The rectifying stepped hole 54H has a first expanding portion 54A1 facing the expanding portion 31Vb formed concentrically with the central axis of the rectifying member 54 and a second expanding portion 54A2 communicating with the first expanding portion 54A1. It is composed of a third expansion unit 54A3 communicating with the expansion unit 52A2 and a reduction unit 54B communicating with the third expansion unit 54A3. The inner diameter of the first enlarged portion 54A1 is set to be larger than the inner diameter of the enlarged portion 31Vb, the second enlarged portion 54A2, the third enlarged portion 54A3, and the reduced portion 54B. The inner diameters of the second enlarged portion 54A2 and the third enlarged portion 54A3 are set to be larger than the inner diameter of the reduced portion 54B.

In FIG. 6C, the cylindrical metal rectifying member 56 has a rectifying stepped hole 56H on an axis common to the central axis of the valve body 23. The rectifying stepped hole 56H has a first expanding portion 56A1 facing the expanding portion 31'Vb formed concentrically with the central axis of the rectifying member 56 and a second expanding portion 56A1 communicating with the first expanding portion 56A1. It is composed of a portion 56A2 and a reduction portion 56B communicating with the second expansion portion 56A2. The inner diameter of the first enlarged portion 56A1 is set to be the same as the inner diameter of the enlarged portion 31'Vb. At that time, the peripheral edge of the open end of the enlarged portion 31'Vb of the valve seat 31'that communicates with the valve port 31'Va is chamfered. The inner diameter of the first enlarged portion 56A1 is set to be larger than the inner diameter of the second enlarged portion 56A2 and the reduced portion 56B. The inner diameter of the second enlarged portion 52A2 is set to be larger than the inner diameter of the reduced portion 56B. An annular tapered surface is formed at the boundary portion between the first enlarged portion 56A1 and the second enlarged portion 56A2 and the boundary portion between the second enlarged portion 56A2 and the reduced portion 56B, respectively.

7 (A) and 7 (B) show still another example of the rectifying member used in the example of the electric valve according to the present invention, respectively. The rectifying members 58 and 60 shown in FIGS. 7A and 7B are respectively fixed to the open end of the connecting pipe 34 by brazing in the furnace.

In FIG. 7A, the cylindrical metal rectifying member 58 has a flange portion 58F sandwiched between an end surface of the valve seat 31V enlarged portion 31Vb opened and an opening end surface of the connecting pipe 34, and a flange portion 58F. It has a cylindrical portion 58C connected to the above. The rectifying member 58 has a rectifying stepped hole 58H inside on an axis common to the central axis of the valve body 23. A predetermined gap CL is formed between the outer peripheral surface of the cylindrical portion 58C and the inner peripheral surface of the connecting pipe 34. As a result, when the rectifying member 58 is fixed to the open end of the connecting pipe 34 by brazing in the furnace, there is no possibility that the brazing will enter the valve port 31Va and the rectifying stepped hole 58H of the rectifying member 58. ..

The rectifying stepped hole 58H is composed of an expanding portion 58A formed concentrically with the central axis of the rectifying member 58 and facing the expanding portion 31Vb, and a reducing portion 58B communicating with the expanding portion 58A. A tapered surface 58t is formed at the boundary between the enlarged portion 58A and the reduced portion 58B. The inner diameter of the enlarged portion 58A and the inner diameter of the enlarged portion 31Vb are set to the same value. The inner diameter of the enlarged portion 58A is set to be larger than the inner diameter of the reduced portion 58B. The lengths of the enlarged portion 58A and the reduced portion 58B along the central axis are set in the same manner as in the example shown in FIG.

In FIG. 7B, the cylindrical metal rectifying member 60 has a flange portion 60F sandwiched between an end surface of the valve seat 31V enlarged portion 31Vb opened and an opening end surface of the connecting pipe 34, and a flange portion 60F. It has a cylindrical portion 60C connected to the above. The rectifying member 60 has a rectifying stepped hole 60H inside on an axis common to the central axis of the valve body 23. A predetermined gap CL is formed between the outer peripheral surface of the cylindrical portion 60C and the inner peripheral surface of the connecting pipe 34. As a result, when the rectifying member 60 is fixed to the open end of the connecting pipe 34 by brazing in the furnace, there is no possibility that the brazing will enter the valve port 31Va and the rectifying stepped hole 60H of the rectifying member 60. ..

The three-stage rectifying stepped hole 60H is a second expanding portion 60A1 facing the expanding portion 31Vb formed concentrically with the central axis of the rectifying member 60 and a second expanding portion 60A1 communicating with the first expanding portion 60A1. It is composed of an expansion unit 60A2, a third expansion unit 60A3 communicating with the expansion unit 60A2, and a reduction unit 60B communicating with the third expansion unit 60A3. The inner diameter of the first enlarged portion 60A1 is set to be larger than the inner diameter of the enlarged portion 31Vb, the second enlarged portion 60A2, the third enlarged portion 60A3, and the reduced portion 60B. The inner diameters of the second enlarged portion 60A2 and the third enlarged portion 60A3 are set to be larger than the inner diameter of the reduced portion 60B.

23 Valve body 23E Needle part 31 Valve body part 31A Valve body accommodating part 31V, 31'V Valve seat 31Vb Expansion part 32 Connection pipe 32P First port 34 Connection pipe 34P Second port 36, 46, 48, 50 , 52, 54, 56, 58, 60 Rectifying member 36A Enlarged part 36B Reduced part 36H, 46H, 48H, 50H, 52H, 54H, 56H, 58H, 60H Rectifying stepped hole

Claims (8)

It has a first port connected to the first passage and a second port connected to the second passage, and has a valve port communicating with the first port and the second port. A valve body portion including a housing portion that movably accommodates a valve body unit including a valve body that is close to or separated from the valve port and controls an opening area.
Valve body unit drive that causes the valve body unit to perform an operation of controlling the opening area of the valve body so as to adjust the flow rate of the fluid passing between the tip end portion of the valve body and the peripheral edge of the valve body. With a mechanism,
The valve seat adjacent to the second port facing the tip of the valve body is formed with the valve port and an enlarged portion communicating with the valve port on the second port side of the valve port, and further with the valve seat. Separately, on the second port side of the valve seat, a rectifying member having a stepped hole for rectifying, which faces the enlarged portion of the valve seat and whose inner diameter becomes smaller toward the second port, is provided. An electric valve characterized by that. The rectifying stepped hole of the rectifying member is formed with an enlarged portion having a large inner diameter facing the enlarged portion of the valve seat, and has an inner diameter smaller than the inner diameter of the enlarged portion of the rectifying stepped hole facing the second port. The electric motor according to claim 1, wherein the reduced portion is formed, and the inner diameter of the enlarged portion of the rectifying stepped hole of the rectifying member is set to a value equal to or larger than the inner diameter of the enlarged portion of the valve seat. valve. The rectifying stepped hole of the rectifying member is characterized in that holes having two or more steps having different inner diameters whose inner diameters are reduced from the valve seat side to the second port side are formed on a common central axis. The electric valve according to claim 1 or 2. When the valve body is fully lowered, the insertion length into the valve seat from the upper surface of the valve port of the valve seat to the tip of the valve body toward the second port side is the stepped hole for rectification of the rectifying member. The value of the sum of the length of the enlarged portion of the valve seat along the central axis of the second port and the length from the upper surface of the valve port of the valve seat to the opening end surface of the enlarged portion of the valve seat on the second port side. The electric valve according to any one of claims 1 to 3, wherein the electric valve is set as follows. The electric valve according to any one of claims 1 to 4, wherein the minimum inner diameter of the reduced portion of the stepped hole for rectification of the rectifying member is set to a value equal to or larger than the inner diameter of the valve port. The electric valve according to any one of claims 1 to 5, wherein a tapered surface is formed at a boundary portion between an enlarged portion and a reduced portion of the stepped hole for rectification of the rectifying member. The rectifying member has a flange portion that is in contact with an end surface at which the enlarged portion of the valve seat opens, and a cylindrical portion that is connected to the flange portion, and is an inner peripheral surface of a pipeline that forms the second port. The electric valve according to any one of claims 1 to 6, wherein a gap is formed between the cylindrical portion and the outer peripheral surface of the cylindrical portion. Equipped with an evaporator, a compressor, and a condenser,
A refrigeration cycle system according to any one of claims 1 to 7, wherein the electric valve is provided in a pipe arranged between an outlet of the condenser and an inlet of the evaporator.

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