Electric valve and refrigeration cycle system having the same

Abstract

The present invention provides an electric valve capable of suppressing the sound pressure level of fluid passing sound generated in the electric valve. A cylindrical rectifying component (36) independently provided with a valve seat (31V) has a rectifying stepped hole (36H) on an axis common to the central axis of a valve core (23), the rectifying stepped hole (36H) being composed of an enlarged portion (36A) formed concentrically with the central axis of the rectifying component (36) and a reduced portion (36B) communicating with the enlarged portion (36A), the inner diameter (D3) of the enlarged portion (36A) being set to a value larger than the inner diameter (D1) of a valve port (31Va) and the inner diameter (D4) of the reduced portion (36B) and being larger than the inner diameter (D2) of the enlarged portion (31Vb).

Description

[0001] This application is a divisional application; the application number of the parent case is "2020107077279", and the name of the invention is "Electric valve and a refrigeration cycle system having the electric valve". Technical Field

[0002] The present invention relates to an electric valve and a refrigeration cycle system having the electric valve. Background Art

[0003] In a refrigeration cycle system, an electric valve as an expansion valve is arranged between a condenser and an evaporator. In recent years, in a refrigeration cycle system, as the noise of a compressor and a fan is reduced, the fluid passing sound of the refrigerant passing through the piping and the electric valve becomes obvious, and thus there is an urgent need for a quiet performance of an electric valve with a faster passing speed of the refrigerant. In such an electric valve, for example, as shown in FIG. 11 in Patent Document 1, the following structure is proposed: in order to reduce the sound pressure level of the passing sound of the refrigerant, a rectifying portion is provided in the second pipe joint adjacent to the valve port of the valve body. The valve port of such a valve body is formed by a first port, a first tapered portion, and a second port. At this time, the inner diameter of the second port is set to be larger than the inner diameter of the first port. Furthermore, the inner diameter of the second port is set to be larger than the inner diameter of the cylindrical rectifying portion.

[0004] In such a structure, since the inner diameter of the second port is set larger than the inner diameter of the first port, the flow rate of the refrigerant flowing from the first pipe joint connected to the valve body of the electric valve into the first port is reduced, and the refrigerant is discharged into the second pipe joint through the rectifying part. At this time, the sound pressure level of the passing sound of the refrigerant is reduced.

[0005] On the other hand, for the refrigerant that has passed through the rectifying portion in the second pipe joint and flowed toward the valve port of the valve body, first, since the inner diameter of the rectifying portion is smaller than the inner diameter of the second pipe joint, the rectifying portion performs rectification, and then, since the inner diameter of the second port is set larger than the inner diameter of the cylindrical rectifying portion, the flow velocity of the refrigerant flowing into the second port of the valve body is decelerated. At this time, the sound pressure level of the passing sound of the refrigerant passing through the second port is further reduced.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: International Publication No. 2018 / 230159 Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, when the refrigerant flows from the first pipe joint to the second port through the first port of the valve body, the flow rate of the refrigerant may not be sufficiently reduced between the second port and the rectifying portion. In such a case, it is also considered to set the length of the second port of the valve body along the flow direction of the refrigerant to be larger. However, such a countermeasure is not a good solution because the processing difficulty of the second port of the valve body is high.

[0011] In view of the above problems, an object of the present invention is to provide an electric valve and a refrigeration cycle system including the electric valve, which can suppress the sound pressure level of fluid passing sound generated in the electric valve.

[0012] Solutions to Solve Problems

[0013] In order to achieve the above-mentioned purpose, the electric valve of the present invention is characterized in that it comprises: a valve body portion, which has a first port connected to the first passage and a second port connected to the second passage, and has a valve port connected to the first port and the second port, and the valve body portion has a storage portion, which can movably store a valve core unit composed of a valve core that controls the opening area relative to the valve port to approach or separate; and a valve core unit driving mechanism, which causes the valve core unit to control the opening area of ​​the valve port so as to adjust the flow rate of the fluid passing between the front end of the valve core and the periphery of the valve port, and a valve port and an expansion portion connected to the valve port on the second port side of the valve port are formed on a valve seat facing the front end of the valve core and adjacent to the second port, and a rectifying component is provided on the second port side of the valve seat independently of the valve seat, the rectifying component having a stepped hole for rectifying, the stepped hole for rectifying facing the expanded portion of the valve seat, and the inner diameter decreases as it approaches the second port.

[0014] The electric valve of the present invention is characterized in that it comprises: a valve body having a first port connected to the first passage and a second port connected to the second passage, and having a valve port connected to the first port and the second port, and a storage portion that can movably store a valve core unit composed of a valve core that controls an opening area relative to or away from the valve port; and a valve drive portion that causes the above-mentioned valve core unit to control the opening area of ​​the above-mentioned valve port so as to adjust the flow rate of the fluid passing between the front end portion of the above-mentioned valve core and the periphery of the above-mentioned valve port,

[0015] The valve seat is provided with the valve port, and an expansion portion communicating with the valve port is formed on the central axis of the valve core of the valve port on the side opposite to the valve driving portion.

[0016] A rectifying member is provided independently of the valve seat on the side opposite to the valve driving portion in the direction of the central axis of the valve core of the valve seat, the rectifying member having one or more rectifying stepped holes facing the enlarged portion of the valve seat and having a flow path area that decreases as it moves away from the valve seat side.

[0017] The rectifying stepped holes of the rectifying component are formed on a common central axis with two or more stages of holes having different inner diameters.

[0018] The inner diameter decreases from the valve seat side toward the side opposite to the valve driving portion.

[0019] Preferably, the rectifying stepped hole of the rectifying component is formed with an enlarged portion facing the enlarged portion of the valve seat and having a larger inner diameter, and is formed with a reduced portion facing the second port and having an inner diameter smaller than the inner diameter of the enlarged portion of the rectifying stepped hole, and the inner diameter of the enlarged portion of the rectifying stepped hole of the rectifying component is set to a value greater than the inner diameter of the enlarged portion of the valve seat.

[0020] Preferably, the rectifying stepped hole of the rectifying member is formed on a common central axis with an inner diameter that decreases from the valve seat side toward the second port side and has two or more different stages of inner diameter.

[0021] Preferably, when the valve core is at its maximum descent, the insertion length from the upper surface of the valve port of the valve seat to the front end of the valve core inserted into the valve seat toward the second port is set to be less than the sum of the length of the expansion portion with the stepped hole for rectification of the rectification component 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 expansion portion of the valve seat on the second port side.

[0022] Preferably, the minimum inner diameter of the reduced 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 valve port.

[0023] Furthermore, it is preferable that a tapered surface is formed at a boundary portion between an enlarged portion and a reduced portion of the rectifying stepped hole of the rectifying member.

[0024] Preferably, the rectifying member includes a flange portion abutting against the end surface of the expanded portion of the valve seat and a cylindrical portion connected to the flange portion, and a gap is formed between the inner peripheral surface of the pipe forming the second port and the outer peripheral surface of the cylindrical portion.

[0025] Furthermore, the refrigeration cycle system of the present invention is characterized in that it includes an evaporator, a compressor, and a condenser, and the electric valve is provided in a pipe provided between an outlet of the condenser and an inlet of the evaporator.

[0026] The effects of the invention are as follows.

[0027] According to the electric valve of the present invention and the refrigeration cycle system equipped with the electric valve, a valve port and an enlarged portion communicating with the valve port on the second port side of the valve port are formed on the valve seat facing the front end of the valve core and adjacent to the second port, and a rectifying component is provided on the second port side of the valve seat independently of the valve seat, and the rectifying component has a rectifying stepped hole, and the rectifying stepped hole is formed with an enlarged portion facing the enlarged portion of the valve seat and having a larger inner diameter, and the inner diameter decreases toward the second port. By providing a rectifying component independently of the valve seat so that the enlarged portion of the rectifying component faces the enlarged portion of the valve seat, the length of the enlarged portion can be extended without increasing the difficulty of processing, and the flow rate of the fluid can be sufficiently reduced by using the extended enlarged portion. In addition, the rectifying component has a rectifying stepped hole whose inner diameter decreases toward the second port, thereby suppressing the sound pressure level of the fluid passing sound generated in the electric valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 yes Figure 2 A partial enlarged cross-sectional view of part A.

[0029] Figure 2 It is a cross-sectional view showing the structure of an example of the electric valve of the present invention.

[0030] Figure 3 This is a diagram schematically showing a configuration of an example of a refrigeration cycle system to which an example of an electric valve according to the present invention is applied.

[0031] Figure 4 is used for Figure 1 A partial cross-sectional view illustrating the operation of the rectifying component shown.

[0032] Figure 5 (A), (B), and (C) are partial cross-sectional views showing another example of the rectifying member used in the example of the electric valve of the present invention.

[0033] Figure 6 (A), (B), and (C) are partial cross-sectional views showing another example of the rectifying member used in the example of the electric valve of the present invention.

[0034] Figure 7 (A) and (B) are partial cross-sectional views showing another example of the rectifying member used in the example of the electric valve of the present invention.

[0035] In the figure:

[0036] 23—valve core, 23E—needle-shaped portion, 31—valve body, 31A—valve core storage portion, 31V, 31′V—valve seat, 31Vb—enlarged portion, 32—connecting tube, 32P—first port, 34—connecting tube, 34P—second port, 36, 46, 48, 50, 52, 54, 56, 58, 60—rectifying component, 36A—enlarged portion, 36B—reducing portion, 36H, 46H, 48H, 50H, 52H, 54H, 56H, 58H, 60H—stepped hole for rectification. DETAILED DESCRIPTION

[0037] Figure 2 The structure and piping pipe of an example of the electric valve of the present invention are shown.

[0038] For example Figure 3 As shown in the figure, the electric valve 3 as an example of the electric valve of the present invention is arranged between the outlet of the outdoor heat exchanger 6 and the inlet of the indoor heat exchanger 2 in the cooling operation described below in the piping of the refrigeration cycle system. In the cooling operation, the electric valve 3 is connected to the primary side piping Du1 by the connection pipe 32 described below, and is connected to the secondary side piping Du2 by the connection pipe 34. The primary side piping Du1 connects the outlet of the outdoor heat exchanger 6 to the electric valve 3, and the secondary side piping 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, there are arranged the piping Du3 connected to the outlet of the indoor heat exchanger 2, the flow path switching valve 8, and the piping Du6 connected to the inlet of the outdoor heat exchanger 6. In addition, the compressor 4 is connected to the flow path switching valve 8 through the piping Du4 and the piping Du5. The other end of the piping Du3 is connected to the port 8b of the flow path switching valve 8. The other end of the piping Du6 is connected to the port 8d of the flow path switching valve 8. One end of the pipe Du4 is connected to the port 8c of the flow switching valve 8, and the other end of the pipe Du4 is connected to the suction port of the compressor 4. One end of the pipe Du5 is connected to the port 8a of the flow switching valve 8, and the other end of the pipe Du5 is connected to the discharge port of the compressor 4. During the cooling operation, the port 8a is connected to the port 8d, and the port 8b is connected to the port 8c. Thus, during the cooling operation, the refrigerant in the refrigeration cycle system, for example, flows along Figure 3 The outdoor heat exchanger 6 functions as a condenser and the indoor heat exchanger 2 functions as an evaporator. In addition, the electric valve 3 is connected to the primary side pipe Du1 by the connecting pipe 32 and connected to the secondary side pipe Du2 by the connecting pipe 34 during the cooling operation, but the present invention is not limited to such an example. For example, during the cooling operation, the electric valve 3 may be connected to the primary side pipe Du1 by the connecting pipe 34 and connected to the secondary side pipe Du2 by the connecting pipe 32.

[0039] On the other hand, during the heating operation, the flow path switching valve 8 is switched so that the port 8a of the flow path switching valve 8 is connected to the port 8b, and the port 8c is connected to the port 8d. Figure 3 The indoor heat exchanger 2 functions as a condenser and the outdoor heat exchanger 6 functions as an evaporator. The compressor 4 and the electric valve 3 are driven and the flow path switching valve 8 is switched by a control unit (not shown).

[0040] like Figure 2 As shown, the electric valve is constructed to include: a valve driving portion, which is arranged in the cylindrical rotor housing 20 and drives the following valve core unit; a valve body portion 31, which is connected to the end of the rotor housing 20 and has a valve seat 31V, and the valve seat 31V has a valve port for the front end of the valve core 23 to approach or separate; and a valve core unit, which includes a valve core 23 arranged in the valve body portion 31 and close to or separated from the valve port relative to the valve seat 31V.

[0041] The valve drive unit is constructed to include the following components as main elements: an externally threaded shaft 14, which enables the valve core unit described below to move up and down; a guide support portion 12, which has an internal thread portion 12B formed with an internal thread 12FMS that engages with the externally threaded shaft 14, and is fixed to the valve body portion 31 and guides the valve core unit to be able to move up and down; a rotor 10, which is magnetized, fixed to the guide shaft portion 14A of the externally threaded shaft 14, and supported to be able to rotate; and a stator coil 40, which is arranged on the outer periphery of the rotor housing 20 and enables the rotor 10 to rotate.

[0042] The guide support portion 12 has a guide surface on the inner peripheral portion, and the guide surface guides a cylindrical valve body case 19 constituting a part of the valve body unit so as to be movable up and down.

[0043] The external thread shaft 14 is composed of the following components: an external thread portion 14B, which is engaged with the internal thread 12FMS of the internal thread portion 12B; a connecting portion 14C, which is formed at the lower end of the external thread portion 14B and is engaged with the periphery of the through hole 19a of the valve core housing 19 via a gasket (not shown); and a guide shaft portion 14A, which is formed at the upper end of the external thread portion 14B. The guide shaft portion 14A is rotatably supported in a cylindrical portion 20C, which protrudes from the top of the rotor housing 20 toward the guide support portion 12 along the central axis.

[0044] A spiral guide portion 11 is formed on the outer periphery of the cylindrical portion 20C, and the spiral guide portion 11 guides the movable limit plate 11B to move along the central axis direction of the cylindrical portion 20C while rotating the movable limit plate 11B. One end of the movable limit plate 11B is fixed to the protrusion of the rotor 10. In addition, at the uppermost end and the lowermost end of the cylindrical portion 20C, there are respectively provided with stop portions 20US and 20LS of the movable limit plate 11B. Thus, when the movable limit plate 11B abuts against the stop portions 20US and 20LS, the movable limit plate 11B stops at a predetermined valve closing position of the valve core 23 described below, and a predetermined rotation angle corresponding to a predetermined valve opening (fully open) position.

[0045] The valve driving unit described above is controlled by a driving control unit (not shown) based on a driving pulse signal supplied to the stator coil 40 .

[0046] The valve core unit is constructed to include the following components as main elements: a needle-shaped valve core 23, which approaches or separates from the valve port 31Va of the valve seat 31V described below; a cylindrical resin spring seat component 24, which cooperates with a gasket (not shown) to engage the protruding portion 14F of the connecting portion 14C of the external threaded shaft 14 with the inner peripheral edge of the opening end 19T of the valve core housing 19; a coil spring 22, which is arranged between the protruding portion 24T of the spring seat component 24 and the flat portion for the spring seat at one end of the valve core 23, and applies force in a direction to separate the two from each other; and a cylindrical valve core housing 19, which accommodates the spring seat component 24, the coil spring 22 and one end of the valve core 23.

[0047] One end of the cylindrical valve core housing 19 close to the valve seat 31V is sealed by fixing the outer peripheral portion of one end of the valve core 23. The other end of the cylindrical valve core housing 19 is an open end 19T, and the open end 19T has a hole 19a for passing the reduced diameter portion of the positioning gasket in the connecting portion 14C of the external threaded shaft 14. Therefore, the gasket is arranged between the inner peripheral edge of the open end 19T of the valve core housing 19 and one end surface of the extension portion 14F.

[0048] The outer peripheral portion of the cylindrical valve core housing 19 is supported on the guide surface of the guide support portion 12 so as to be able to slide in contact and perform lifting and lowering movements. Thus, after the front end (needle-shaped portion) of the other end of the valve core 23 is inserted into the valve port 31Va of the valve seat 31V and the outer peripheral surface of the needle-shaped portion of the valve core 23 abuts against the peripheral edge of the opening portion of the valve port 31Va, when the external threaded shaft 14 continues to be lowered, the coil spring 22 is compressed by a predetermined amount. In this way, the outer peripheral surface of the needle-shaped portion 23E of the valve core 23 is pressed to the peripheral edge of the opening portion of the valve port 31Va by utilizing the elastic force of the coil spring 22. Thus, the valve port 31Va of the valve seat 31V is blocked. In addition, when the valve core is in the maximum descending state, the valve core can be prevented from abutting against the peripheral edge of the opening of the valve port, thereby obtaining a small flow rate even when the valve core is in the maximum descending state.

[0049] The valve body 31 is made of a metal material, such as brass, stainless steel, aluminum alloy, or resin material, and has a valve core housing portion 31A on the inside, which houses the lower end of the guide support portion 12 below the internal thread portion 12B, the other end of the valve core 23, and the cylindrical valve core housing 19. In the valve core housing portion 31A, the other end of the valve core 23 protrudes toward the valve port 31Va. In addition, a first port 32P and a valve seat 31V are formed in the valve core housing portion 31A, wherein the first port 32P is connected to one end of a connecting pipe 32 as a first passage on an axis substantially orthogonal to the central axis of the valve core 23, and the valve seat 31V is connected to one end of a connecting pipe 34 as a second passage on an axis common to the central axis of the valve core 23 and is adjacent to the second port 34P.

[0050] like Figure 1 As shown in the partial enlargement in FIG. 2 , the valve seat 31V has a valve port 31Va and an enlarged portion 31Vb connected to the valve port 31Va on the same axis as the central axis of the valve core 23. The inner circumference of the valve port 31Va and the inner circumference of the adjacent enlarged portion 31Vb are connected by an annular tapered surface 31Vt.

[0051] The upper end surface of the metal rectifying member 36 inserted into the second port 34P of the connecting pipe 34 abuts against the end surface where the enlarged portion 31Vb of the valve seat 31V opens. The outer peripheral surface of the rectifying member 36 is fixed to the inner peripheral surface of the connecting pipe 34.

[0052] like Figure 1As shown in the enlarged view in FIG. 1 , the cylindrical rectifying member 36 has a rectifying stepped hole 36H on the same axis as the central axis of the valve core 23. The rectifying stepped hole 36H is composed of an enlarged portion 36A and a reduced portion 36B, wherein the enlarged portion 36A is opposite to the enlarged portion 31Vb formed concentrically with the central axis of the rectifying member 36, and the reduced portion 36B is connected to the enlarged portion 36A on the second port 34P side of the enlarged portion 36A. The inner diameter D3 of the enlarged portion 36A is set to a value greater than the inner diameter D1 of the valve port 31Va and the inner diameter D4 of the reduced portion 36B and greater than the inner diameter D2 of the enlarged portion 31Vb. In addition, the inner diameter D4 of the reduced portion 36B is set to a value greater than the inner diameter D1 of the valve port 31Va. The length L3 of the enlarged portion 36A along the central axis is set to a value greater than the length L2 from the tapered surface 31Vt to the end surface of the enlarged portion 31Vb along the central axis. The length L6 of the reduction portion 36B along the central axis is set to a value greater than the throttling length L1 of the valve port 31Va. Figure 1 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 set, for example, to be less than about 91% of the distance Lb from the upper surface of the valve port of the valve seat 31V to the end surface of the rectifying member 36. This ratio is set, for example, so that the refrigerant actually flows through the valve port 31Va, the enlarged portion 31Vb, and the rectifying stepped hole 36H, the passing sound of the refrigerant is detected, and the sound pressure level of the passing sound is minimized.

[0053] In such a structure, the stator coil 40 of the valve driving part is controlled according to the driving pulse signal from the driving control part, and by making the valve core 23 move up and down, the refrigerant as a fluid supplied through the connecting pipe 32 or the connecting pipe 34 flows through the gap flow path at a predetermined flow rate along the direction indicated by the arrow F or the arrow R, wherein the above-mentioned gap flow path is formed between the inner peripheral surface of the valve seat 31V forming the valve port 31Va and the needle-shaped portion 23E of the valve core 23.

[0054] In this way, the inner diameter D3 of the expanded portion 36A in the rectifying member 36 is set to a value greater than the inner diameter D2 of the expanded portion 31Vb, and the length L3 of the expanded portion 36A along the central axis is set to a value greater than the length L2 from the tapered surface 31Vt to the end surface of the expanded portion 31Vb along the central axis, thereby expanding the deceleration area in the expanded portion 31Vb, thereby suppressing the rupture of cavitation and suppressing the sound pressure level of the passing sound of the refrigerant. As a result, Figure 4As shown, for example, the flow ST1 flowing in through the valve port 31Va becomes the flow ST2 decelerated by the expansion portion 31Vb, and the flow ST3 that is not completely decelerated on the valve seat 31V side is decelerated by the flow path (expansion portion 36A) on the side of the rectifying member 36, and cavitation rupture occurs, but the distance of flow velocity deceleration is long, so that the influence is difficult to reach the reduction portion 36B of the rectifying member 36. In addition, after the flow ST4 is rectified, the released flow ST5 is discharged into the second port 34P.

[0055] The inner diameter D4 of the reduction portion 36B is a value greater than the inner diameter D1 of the valve port 31Va and is set smaller than the inner diameter D3 of the expansion portion 36A, thereby rectifying the turbulent flow of the refrigerant in the reduction portion 36B, thereby suppressing the sound pressure level of the refrigerant passing sound. In addition, the length L6 of the reduction portion 36B along the central axis is set to a value greater than the throttling length L1 of the valve port 31Va, thereby stably rectifying the flow of the refrigerant.

[0056] In addition, 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 expansion portion 31Vb and the length L3 of the expansion portion 36A is set to be greater than the length from the upper surface of the valve port of the valve seat 31V to the lower end of the needle-shaped portion 23E of the valve core 23, that is, the insertion length L5 of the needle-shaped portion 23E in the valve seat 31. Therefore, even during small flow control, since the expansion portion 36A of the rectifying part 36 is formed at a position forward of the front end of the needle-shaped portion 23E (lower side), the sound pressure level of the passing sound of the refrigerant can be suppressed regardless of the position of the needle-shaped portion 23E.

[0057] Figure 5 (A), (B) and (C) of FIG. 1 respectively show another example of a rectifying component used in one example of the electric valve of the present invention. Figure 5 (A), (B) and (C), the following Figure 6 (A), (B) and (C), Figure 7 In (A) and (B), the same symbol is used to indicate Figure 1 The components in the illustrated example are the same components, and their repeated descriptions are omitted.

[0058] Figure 5In (A), the cylindrical metal rectifying component 46 has a stepped hole 46H for rectifying on the same axis as the central axis of the valve core 23. The stepped hole 46H for rectifying is composed of an enlarged portion 46A and a reduced portion 46B, wherein the enlarged portion 46A is opposite to the enlarged portion 31Vb formed concentrically with the central axis of the rectifying component 46, and the reduced portion 46B is connected to the enlarged portion 46A. A tapered surface 46t is formed at the boundary portion between the enlarged portion 46A and the reduced portion 46B. The inner diameter of the enlarged portion 46A is set to the same value as the inner diameter of the enlarged portion 31Vb. The inner diameter of the enlarged portion 46A is set to be larger than the inner diameter of the reduced portion 46B. In addition, the lengths of the enlarged portion 46A and the reduced portion 46B along the central axis are respectively set to be the same as those of the enlarged portion 31Vb. Figure 1 The examples shown are the same.

[0059] Figure 5 In (B), the cylindrical metal rectifying member 48 has a rectifying stepped hole 48H on the same axis as the central axis of the valve core 23. The rectifying stepped hole 48H is composed of an enlarged portion 48A and a reduced portion 48B, wherein the enlarged portion 48A is opposite to the enlarged portion 31Vb formed concentrically with the central axis of the rectifying member 48, and the reduced portion 48B is connected to the enlarged portion 48A. No boundary is formed between the enlarged portion 46A and the reduced portion 46B. Figure 5 The inner diameter of the enlarged portion 48A is set to be the same as the inner diameter of the enlarged portion 31Vb. The inner diameter of the enlarged portion 48A is set to be larger than the inner diameter of the reduced portion 48B. In addition, the lengths of the enlarged portion 48A and the reduced portion 48B along the central axis are set to be the same as the inner diameter of the enlarged portion 48A and the reduced portion 48B. Figure 1 The examples shown are the same.

[0060] Figure 5 In (C), the cylindrical metal rectifying component 50 has a stepped hole 50H for rectifying on the same axis as the central axis of the valve core 23. The stepped hole 50H for rectifying is composed of an enlarged portion 50A1, a reduced portion 50B and a tapered portion 50A2, wherein the enlarged portion 50A1 is opposite to the enlarged portion 31Vb formed concentrically with the central axis of the rectifying component 50, the reduced portion 50B has an open end opening in the second port 34P, and the tapered portion 50A2 connects the enlarged portion 50A and the reduced portion 50B. The inner diameter of the enlarged portion 50A1 is set to the same value as the inner diameter of the enlarged portion 31Vb. The inner diameter of the enlarged portion 50A1 is set to be larger than the inner diameter of the reduced portion 50B. In addition, the lengths of the enlarged portion 50A1 and the reduced portion 50B along the central axis are respectively set to be the same as the inner diameter of the enlarged portion 31Vb. Figure 1 The examples shown are the same.

[0061] Figure 6 (A), (B), and (C) respectively show another example of the rectifying member used in one example of the electric valve of the present invention. Figure 6The rectifying components 52, 54 and 56 shown in (A), (B) and (C) have multi-stage rectifying stepped holes, respectively. This increases the separation points of the refrigerant flow in the rectifying components to cause the generation of vortices, thereby reducing the sound pressure level of the refrigerant passing sound in the rectifying components.

[0062] Figure 6 In (A), the cylindrical metal rectifying member 52 has a two-stage rectifying stepped hole 52H on the same axis as the central axis of the valve core 23. The rectifying stepped hole 52H is composed of a first enlarged portion 52A1, a second enlarged portion 52A2, and a reduced portion 52B, wherein the first enlarged portion 52A1 is opposite to the enlarged portion 31Vb formed concentrically with the central axis of the rectifying member 52, the second enlarged portion 52A2 is connected to the first enlarged portion 52A1, and the reduced portion 52B is connected to the enlarged portion 52A2. The inner diameter of the first enlarged portion 52A1 is set to be larger than the inner diameters 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.

[0063] Figure 6 In (B), the cylindrical metal rectifying member 54 has a three-stage rectifying stepped hole 54H on the same axis as the central axis of the valve core 23. The rectifying stepped hole 54H is composed of a first enlarged portion 54A1, a second enlarged portion 54A2, a third enlarged portion 54A3 and a reduced portion 54B, wherein the first enlarged portion 54A1 is opposite to the enlarged portion 31Vb formed concentrically with the central axis of the rectifying member 54, the second enlarged portion 54A2 is connected to the first enlarged portion 54A1, the third enlarged portion 54A3 is connected to the enlarged portion 52A2, and the reduced portion 54B is connected to the third enlarged portion 54A3. The inner diameter of the first enlarged portion 54A1 is set to be larger than the inner diameters 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.

[0064] Figure 6In (C), the cylindrical metal rectifying member 56 has a rectifying stepped hole 56H on the same axis as the central axis of the valve core 23. The rectifying stepped hole 56H is composed of a first enlarged portion 56A1, a second enlarged portion 56A2, and a reduced portion 56B, wherein the first enlarged portion 56A1 is opposite to the enlarged portion 31′Vb formed concentrically with the central axis of the rectifying member 56, the second enlarged portion 56A2 is connected to the first enlarged portion 56A1, and the reduced portion 56B is connected to the second enlarged 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 this time, the peripheral edge of the opening end of the enlarged portion 31′Vb of the valve seat 31′ connected to the valve port 31′Va is chamfered. The inner diameter of the first enlarged portion 56A1 is set to be larger than the inner diameters of the second enlarged portion 56A2 and the reduced portion 56B. The inner diameter of the second enlarged portion 52A2 is set larger than the inner diameter of the reduced portion 56B. Annular tapered surfaces are formed at the boundary between the first enlarged portion 56A1 and the second enlarged portion 56A2 and at the boundary between the second enlarged portion 56A2 and the reduced portion 56B.

[0065] Figure 7 (A) and (B) of FIG. 1 respectively show another example of the rectifying member used in one example of the electric valve of the present invention. Figure 7 The flow regulating members 58 and 60 shown in (A) and (B) are fixed to the open end of the connecting pipe 34 by brazing in a furnace.

[0066] Figure 7 In (A), the cylindrical metal rectifying component 58 has a flange portion 58F and a cylindrical portion 58C, wherein the flange portion 58F is clamped by the end surface of the expansion portion 31Vb of the valve seat 31V and the open end surface of the connecting pipe 34, and the cylindrical portion 58C is connected to the flange portion 58F. The rectifying component 58 has a rectifying stepped hole 58H on the inner side on the same axis as the central axis of the valve core 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. Therefore, when the rectifying component 58 is fixed to the open end of the connecting pipe 34 by brazing in a furnace, there is no worry that the brazing material will penetrate into the valve port 31Va and the rectifying stepped hole 58H of the rectifying component 58.

[0067] The stepped hole 58H for rectification is composed of an enlarged portion 58A and a reduced portion 58B, wherein the enlarged portion 58A is opposite to the enlarged portion 31Vb formed concentrically with the central axis of the rectification component 58, and the reduced portion 58B is connected to the enlarged 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 is set to the same value as the inner diameter of the enlarged portion 31Vb. The inner diameter of the enlarged portion 58A is set to be larger than the inner diameter of the reduced portion 58B. In addition, the lengths of the enlarged portion 58A and the reduced portion 58B along the central axis are respectively set to be equal to the inner diameter of the enlarged portion 31Vb. Figure 1 The examples shown are the same.

[0068] Figure 7 In (B), the cylindrical metal rectifying component 60 has a flange portion 60F and a cylindrical portion 60C, wherein the flange portion 60F is clamped by the end surface opened by the enlarged portion 31Vb of the valve seat 31V and the open end surface of the connecting pipe 34, and the cylindrical portion 60C is connected to the flange portion 60F. The rectifying component 60 has a rectifying stepped hole 60H on the inner side on the same axis as the central axis of the valve core 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. Therefore, when the rectifying component 60 is fixed to the open end of the connecting pipe 34 by brazing in a furnace, there is no worry that the brazing material will penetrate into the valve port 31Va and the rectifying stepped hole 60H of the rectifying component 60.

[0069] The three-stage rectifying stepped hole 60H is composed of a first enlarged portion 60A1, a second enlarged portion 60A2, a third enlarged portion 60A3, and a reduced portion 60B, wherein the first enlarged portion 60A1 is opposite to the enlarged portion 31Vb formed concentrically with the central axis of the rectifying member 60, the second enlarged portion 60A2 is connected to the first enlarged portion 60A1, the third enlarged portion 60A3 is connected to the enlarged portion 60A2, and the reduced portion 60B is connected to the third enlarged portion 60A3. The inner diameter of the first enlarged portion 60A1 is set to be larger than the inner diameters 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.

Claims

1. An electric valve, It is characterized in that have: A valve body having a first port connected to the first passage and a second port connected to the second passage, a valve port communicating with the first port and the second port, and a housing portion for movably housing a valve core unit including a valve core that controls an opening area by approaching or separating from the valve port; as well as a valve driving unit that causes the valve core unit to control the opening area of ​​the valve port so as to adjust the flow rate of the fluid passing between the front end of the valve core and the periphery of the valve port, The valve seat is provided with the valve port and an expansion portion communicating with the valve port is formed on the side of the valve core at the valve port opposite to the valve driving portion in the central axis direction of the valve core. A rectifying member is provided independently of the valve seat on the side opposite to the valve driving portion in the central axis direction of the valve core of the valve seat, the rectifying member having one or more rectifying stepped holes facing the enlarged portion of the valve seat and having a flow path area that decreases as the flow path moves away from the valve seat. The rectifying stepped hole of the rectifying component has an enlarged portion and a reduced portion. The minimum inner diameter of the reduction portion is set to a value greater than the inner diameter of the valve port. A surface of the expansion portion opening of the rectifying member faces an end surface of the expansion portion opening of the valve seat.

2. The electric valve according to claim 1, It is characterized in that A step is provided between the enlarged portion and the reduced portion of the rectifying member, facing the end surface of the enlarged portion opening of the valve seat. The enlarged portion of the rectifying member is formed concentrically with the axis between the opening on the valve seat side of the enlarged portion and the step. The outer diameter of the enlarged portion of the rectifying member is formed into a cylindrical shape. One end of the rectifying member is located inside the valve body, and the other end of the rectifying member is located outside the valve body. The length of the narrowing portion along the central axis is set to a value greater than a throttling length of the valve port.

3. The electric valve according to claim 1 or 2, It is characterized in that A flow path from the valve seat to the second passage is provided, In this flow path, the inner diameter of the flow path decreases as it becomes farther away from the valve seat.

4. A refrigeration cycle system, It is characterized in that Equipped with evaporator, compressor and condenser, The electric valve described in any one of claims 1 to 3 is provided in a pipe arranged between an outlet of the condenser and an inlet of the evaporator.

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