JP2006307964A - Electric control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric control valve for a low noise air conditioner capable of making flow sound of refrigerant low and preventing a restriction part from being blocked by foreign matter and having no welded part in a section requiring airtightness. <P>SOLUTION: This electric control valve is constituted in such a way that a magnet 2 of a stepping motor 3, a valve seat 9a, and a valve element 4 are stored in a case body 10, refrigerant flows in the case body 10, a cap 11 integrated with a magnet holder 2c holding the magnet 2 and rotating together with the magnet 2 covers a predetermined section of the valve element 4, a common spring 5 composed of a spiral fixing spring 6 and a movable spring 7 is coaxially arranged, the fixing spring 6 is separated from the valve element 4 and the magnet 2, extended parts 6a, 6b, 7a are provided at both ends of the fixing spring 6 and at one end of the movable spring 7, and the movable spring 7 is rotatably fitted into a channel 6c of the fixing spring 6. The movable spring 7 is constituted in such a way that the extended part 7a at its one end is locked in a locking part 11a of a wall part of the cap 11 and moves in the axial direction while rotating on the channel 6c of the fixing spring 6 in accordance with rotation of the magnet, rotation of the cap 11 (magnet) is stopped when one end extended part 7a or the other end part 7b of the movable spring 7 is abutted on either of the extended parts 6a, 6b at both ends of the fixing spring, and travel of the valve element 4 is stopped simultaneously. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement of an electric control valve for controlling a refrigerant flow rate used in an air conditioner or a refrigerator.

  As shown in FIG. 5, in the electric control valve, an upper portion 4a of a valve body 4 is integrally attached to the magnet 2 of a stepping motor 3 comprising a stator core 1 and a magnet 2, and a central portion 4b of the valve body 4 is a valve body 8. The needle-like part 4c of the valve body 4 is located in a valve seat 9 provided in the refrigerant flow path of the valve body 8, and when the stator core 1 is energized, the magnet 2 and the valve The body 4 rotates, the valve body 4 rotates by a screw and moves in the axial direction, and the needle-like portion 4c of the valve body 4 adjusts the opening degree of the valve seat 9 to control the refrigerant flow rate. In FIG. 5, the white arrow indicates the flow direction of the refrigerant.

However, the conventional electric control valve has a large flow noise of the refrigerant, which sometimes disturbs bedtime. The flow noise is particularly likely to occur when the refrigerant passes through the throttle portion in a non-uniformly dispersed gas phase or in a turbulent state.
As a countermeasure against noise reduction, a method of gradually reducing the flow passage area on the refrigerant outlet side of the throttle part (Patent Document 1) or a method of arranging a porous permeable material in the throttle part (Patent Document 2) has been proposed.

  However, the method of Patent Document 1 did not sufficiently reduce the flowing sound. Moreover, since the method of patent document 2 uses a porous permeation | transmission material, it became expensive, and there existed a possibility that a foreign material might block the hole of a porous permeation | transmission material. Even if a bypass is provided in preparation for the blockage, there is a problem that a flow noise is generated when the refrigerant passes through the bypass.

  Moreover, in order to simplify the structure of the electric control valve, a common stopper having one stopper on both sides of opening and closing has been proposed (Patent Documents 3 and 4), but this is a hanging mechanism for locking one end of the moving spring. The stopper (locking portion) is welded to the housing, and the lid is welded to make the inside of the housing airtight. Thus, since there are many welded portions, there is a problem in reliability.

  In addition, foreign matter may adhere to the throttle portion and the refrigerant flow rate may change over time, or the needle-like portion of the valve body may be stuck into the valve seat during operation and the operation may be stopped.

Japanese Patent Laid-Open No. 11-287536 JP 2001-311570 A Japanese Patent Laid-Open No. 10-169821 JP 2001-241562 A

  The present invention is reliable because the flow noise of the refrigerant is low, the throttle part is not easily blocked by foreign matter, the valve body is not bitten into the valve seat and is not fixed, and there is no welded part at the site requiring airtightness. The object is to provide an electric control valve that is high and inexpensive.

  According to the first aspect of the present invention, the valve body moves in the axial direction with the rotation of the magnet of the stepping motor including the stator core and the magnet, and the needle-like portion at the end of the valve body adjusts the opening degree of the valve seat. In the valve, the magnet, the valve seat, and the valve body are accommodated in a housing, a refrigerant flows in the housing, and a magnet holder that holds the magnet in a predetermined portion of the valve body and rotates together with the magnet is integrated. And a common spring for stoppers on both sides of the opening and closing is arranged coaxially. The common spring is composed of a helical fixed spring and a moving spring, and the fixed spring is separated from the valve body and the magnet. Extending portions are provided at both ends of the fixed spring and at one end of the moving spring, the moving spring is rotatably fitted in a groove of the fixed spring, and the moving spring has an extending portion at one end thereof. On the cap wall It moves to the axial direction along the fixed spring while rotating on the groove of the fixed spring in accordance with the rotation of the magnet (cap) by locking with the hooked locking portion, and the extension part at one end of the moving spring or the like The electric control valve is characterized in that the rotation of the cap and the magnet is stopped and the movement of the valve body is stopped at the same time when the end portion comes into contact with any of the extending portions at both ends of the fixed spring.

  According to a second aspect of the present invention, a refrigerant inflow (out) portion is provided at one end of the casing, a refrigerant flow path is provided in a gap between the inner surface of the casing and the outer surface of the magnet, and a refrigerant is provided at the other end of the casing. The electric control valve according to claim 1, further comprising an outflow (inflow) portion.

  According to a third aspect of the present invention, at least one of the refrigerant inflow (out) part at one end of the casing and the refrigerant outflow (in) part at the other end of the casing is formed by drawing the end of the casing. The electric control valve according to claim 2.

  According to a fourth aspect of the present invention, at least one of the inner surface of the refrigerant inflow (outlet) portion or the inner surface of the refrigerant outflow (inlet) portion is provided with a groove parallel to the flow direction of the refrigerant. 3. The electric control valve according to 3.

  According to a fifth aspect of the present invention, the inner surface of the casing is roughened to a roughness having a maximum height Ry of 5 μm or more and an arithmetic average roughness Ra of 2 μm or more. The electric control valve according to any one of the above.

  A sixth aspect of the present invention is the electric control valve according to any one of the first to fifth aspects, wherein the inner surface of the casing is sandblasted.

  According to a seventh aspect of the present invention, the inner diameter of the tip of the portion where the valve seat of the casing is disposed (the valve seat portion) is larger than the inner diameter of the refrigerant outflow (entrance) portion, and the difference is 2 mm or less, The electric control valve according to any one of claims 1 to 6, wherein an inner surface of a boundary portion between the valve seat portion and the refrigerant outflow (inlet) portion is formed in a taper shape.

  The parenthesized notation of the refrigerant inflow (out) part or the refrigerant outflow (in) part means that the inflow part changes to the outflow part or the outflow part changes to the inflow part when cooling and heating are switched.

  According to the first aspect of the present invention, the stopper provided on both sides of the refrigerant flow path is fully replaced and replaced with a common spring combining a helical fixed spring and a helical moving spring. The number of points and the assembly can be simplified, and the cost is reduced.

The spiral moving spring has an extended portion at one end locked to a locking portion of a cap wall unit integrated with a magnet holder that rotates together with the magnet, and rotates while the cap rotates. Since the movement of the moving spring moves in the axial direction and the movement stops at one end of the moving spring or the other end of the moving spring abuts either of the extending portions at both ends of the fixed spring, It is unnecessary. Further, a housing that accommodates a magnet, a valve seat, a valve body and the like does not require a lid. Therefore, there is no welded portion in the portion having airtightness, and the reliability is excellent.
Further, by appropriately setting the distance between the extending portions at both ends of the fixed spring, the valve seat can be opened and closed without excess and deficiency, and troubles such as the needle-like portion of the valve body being caught in the valve seat can be prevented.

  Since the refrigerant rectifies while flowing in the casing and the gas phase is uniformly dispersed, the flow noise when the refrigerant passes through the throttle portion is reduced. In addition, since the magnetic foreign substance in the refrigerant is adsorbed by the magnet while flowing in the housing, clogging of the throttle portion is reduced, and a change in the refrigerant flow rate with time is prevented.

  In the invention according to claim 2, since the refrigerant flows through the narrow gap between the inner surface of the housing and the magnet, the refrigerant is sufficiently rectified, and the flow noise of the refrigerant at the throttle portion is further reduced. Depending on the piping direction of the electronic expansion valve, for example, if heating is performed so that the refrigerant passes through the throttle immediately after passing through the gap, the rectification state is good and the flow noise of the refrigerant is significantly reduced.

  Since one side of the gap is a magnet, the magnetic foreign matter mixed in the refrigerant is efficiently adsorbed and removed by the magnet. Therefore, the clogging of the throttle portion is further reduced, and the change in the refrigerant flow rate with time is better prevented.

  In the invention according to claim 3, since at least one of the refrigerant inflow (out) part at one end of the casing and the refrigerant outflow (in) part at the other end of the casing is formed by drawing the end of the casing, Is cheap. Moreover, since there is no welded part in the site | part which requires airtightness, it is excellent in reliability. Furthermore, since the refrigerant flow path at the boundary between the housing body and the refrigerant outflow (inlet) portion is tapered, the occurrence of turbulent flow due to a sudden change in refrigerant pressure is suppressed, and the flow noise of the refrigerant is further reduced.

  According to the fourth aspect of the present invention, since the groove parallel to the flow direction of the refrigerant is provided in at least one of the inner surface of the refrigerant inflow (outlet) portion or the inner surface of the refrigerant outflow (inlet) portion, rectification of the refrigerant is promoted and flow Sound is further reduced.

  In the fifth aspect of the invention, since the inner surface of the casing is roughened, when the refrigerant passes through the casing, the gas phase (bubbles) in the refrigerant is uniformly dispersed, and the flow noise at the throttle portion is more pronounced. To reduce.

  According to the sixth aspect of the present invention, since the inner surface of the casing is sandblasted, the inner surface of the casing can be easily roughened at a low cost.

  According to a seventh aspect of the present invention, an inner diameter of the front end of the casing valve seat portion is larger than an inner diameter of the refrigerant outflow (inlet) portion, and the difference is suppressed to 2 mm or less, and the casing valve seat portion and the refrigerant are further reduced. Since the inner surface of the boundary portion of the outflow (entry) portion is formed in a taper shape, flow noise due to a sudden change in the refrigerant pressure is suppressed.

Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 (a) is an explanatory side view showing an embodiment of an electric control valve of the present invention, and FIG. 1 (b) is an explanatory side view of a fixed spring.
In the electric control valve of the present invention, the valve body 4 moves in the axial direction with the rotation of the magnet 2 of the stepping motor 3 composed of the stator core 1 and the magnet 2, and the needle-like part 4c at the end of the valve body 4 becomes the valve seat 9a. In the electric control valve that adjusts the opening degree, the magnet 2, the valve seat 9a, and the valve body 4 of the stepping motor 3 including the stator core 1 and the magnet 2 are accommodated in the casing 10, and the refrigerant flows in the casing 10. A cap 11 integrated with a magnet holder 2c that holds the magnet 2 and rotates together with the magnet 2 is put on a predetermined portion of the valve body 4, and a common spring 5 for stoppers on both sides of the opening and closing is arranged coaxially. The common spring 5 includes a helical fixed spring 6 and a moving spring 7. The fixed spring 6 is separated from the valve body 4 and the magnet 2, and extends to both ends of the fixed spring 6 and one end of the moving spring 7, respectively. Protruding parts 6a, 6b, 7a are provided The moving spring 7 is rotatably fitted in the groove 6c of the fixed spring 6. The moving spring 7 has an extended portion 7a at one end locked to a locking portion 11a provided on the inner surface of the cap 11 wall. As the magnet (cap) rotates, it moves in the axial direction along the fixed spring 6 while rotating on the groove 6c of the fixed spring 6, and the extension 7a or the other end 7b at one end of the moving spring 7 is fixed spring. When abutting against one of the extended portions 6a and 6b at both ends, the rotation of the cap 11 and the magnet 2 is stopped, and at the same time, the movement of the valve body 4 is stopped.

  The needle-like tip 4c of the valve body 4 is located in the valve seat 9a provided in the refrigerant flow path of the valve seat 9, and the magnet 2 rotates when the stator core 1 is energized, and the magnet attached to the magnet 2 The valve body 4 integrated with the holder 2c is moved in the axial direction by the male screw of the valve body 8 and the female screw of the magnet holder 2c, whereby the needle-like portion of the valve body 4 moves in the valve seat 9a in the axial direction. Thus, the opening degree of the valve seat 9a is adjusted, and the refrigerant flow rate is controlled. The magnet 2, the valve body 4, the valve main body 8, and the valve seat portion 9 are accommodated in the housing 10, and the stator core 1 is disposed on the outer periphery of the housing 10.

Extending portions (stoppers) 6 a and 6 b are provided at both ends of the fixed spring 6, and an extending portion 7 a is provided at one end of the moving spring 7. The moving spring 7 is rotatably fitted in a groove of the fixed spring 6. It is. A cap 11 integrated with a magnet holder is put on a predetermined portion (upper part) of the valve body 4. The valve body 4 passes through the top plate hole portion 11b of the cap 11, and is fixed by a spring washer 11c in a groove provided at an end portion (through portion) of the valve body. As shown in FIGS. 2 (a) and 2 (b), the cap 11 wall is provided with locking portions 11a and 11a ′ for locking one extending portion 7a of the moving spring 7. .
The locking portion 11a shown in FIG. 2 (a) is a convex shape provided on the inner surface of the cap 11 and the locking portion 11a 'shown in FIG. 2 (b) is a notch shape provided on the wall of the cap 11. These are all provided continuously in the axial direction.

  The fixed spring 6 is configured such that the bent portion of the other end extending portion 6b is inserted into a groove provided in the valve body 8 so as not to move in the axial direction and the circumferential direction. The cap 11 is spot-welded to a magnet holder (female screw member) 2 c that fixes the magnet 2. As a result, the cap 11 rotates together with the magnet 2.

Below, the operation | movement at the time of the heating of the electric control valve of this invention is demonstrated concretely with reference to FIG. In FIG. 1A, the white arrow indicates the flow direction of the refrigerant.
The refrigerant flows in from the refrigerant inflow portion 10a of the housing 10 and out of the refrigerant outflow portion 10b. When the stator 2 is energized and the magnet 2 is rotated forward, the valve body 4 assembled with the magnet 2, the magnet holder, and the cap 11 is connected to the magnet holder (female screw member) 2c and the valve body (male screw member) 8. It moves downward by the screw rotation, and the opening degree of the valve seat 9 decreases. During this time, one end extending portion 7 a of the moving spring 7 abuts on the engaging portion 11 a on the inner surface of the cap 11 wall (see FIG. 2), and the moving spring 7 moves upward along the fixed spring 6 as the cap 11 rotates. When the one end extending portion 7a of the moving spring 7 comes into contact with the one end extending portion 6a of the fixed spring 6, the moving spring 7 stops, and the rotation of the cap 11 and the magnet holder stops at the same time. Stops.

  When the magnet holder is rotated in the reverse direction, the valve body 4 moves upward and the opening degree of the valve seat 9 increases. During this time, the moving spring 7 moves downward along the fixed spring 6, and when the other end 7 b of the moving spring 7 comes into contact with the other end extending portion 6 b of the fixed spring 6, the moving spring 7 stops and accordingly the cap is moved. 11 and the magnet holder stop rotating, and at the same time, the valve body 4 stops.

  Thus, in the present invention, one fixed spring 6 serves as both a fully closed side and a fully opened side stopper of the valve body 4. Further, the opening degree of the valve seat 9 can be finely adjusted by adjusting the number of steps of the stepping motor 3, and is further located in the valve seat portion 9a depending on the installation positions of the extending portions 6a and 6b of the fixed spring 6. An upper limit and a lower limit stop position of the needle-like portion 4c of the valve body 4 that is set are set. In particular, on the fully closed side, the trouble that the valve body 4 (needle portion 4c) adheres to the valve seat 9 is reliably avoided by not setting the lower limit stop position of the needle portion 4c to the fully closed state.

  In the present invention, which of the extension portions 6a and 6b at both ends of the fixed spring 6 is used as an open side stopper and which is used as a closed side stopper is arbitrarily selected by changing the spiral winding direction of the fixed spring 6 it can.

  The assembly of the electric control valve according to the present invention shown in FIG. 1 (a) is performed by, for example, drawing the lower part of the copper pipe that becomes the casing 10 into two stages, and then magnet 2, the magnet holder 2c, the valve body 4, A built-in member composed of the valve main body 8, the cap 11, the valve seat part 9 and the like is inserted from the upper part of the copper pipe, the valve seat part 9 is positioned in the upper part of the lower part of the copper pipe, and the two are caulked and combined. Next, the upper part of the copper pipe is drawn to form the refrigerant inflow portion 10a, and then the stator core 1 is installed on the outer periphery of the copper pipe. The lower lower part of the copper tube serves as the refrigerant outflow portion 10b. Thus, in the electric control valve of the present invention, there is no welded portion in the portion requiring airtightness, and the reliability is excellent.

  In the present invention, the cap 11 is a method of providing a locking portion on the inner surface of a cap-like material produced by cutting, a method of forming a tripod plate produced by press punching a metal plate into a cap shape using a die, etc. Can be produced.

  In the present invention, the shape of the locking portion provided on the wall portion of the cap 11 is such that the inner surface of the wall portion is formed in a convex shape (see FIG. 2 (A)), the shape formed in a concave shape (groove), or the wall portion is cut out. Any shape can be used as long as the extended portion at one end of the moving spring can be locked, such as a bent one (see FIG. 2B).

  When the shape of the one end extending portion 7a of the moving spring 7 is a shape extending in the tangential direction shown in FIG. 2 (a), when the one end extending portion 7a is locked to the locking portion 11a of the wall portion of the cap 11, Since the force acts in the direction in which the moving spring 7 spreads, the moving spring 7 needs to have high rigidity. However, if the shape is bent substantially perpendicular to the tangential direction shown in FIG. Because of this action, the moving spring 7 is difficult to expand. Accordingly, the shape shown in FIG. 2B is recommended as the shape of the one end extending portion 7a of the moving spring 7.

  As shown in FIG. 1, the refrigerant that has flowed from the refrigerant inflow portion at the top of the casing passes through the gap between the inner surface of the casing and the magnet. The refrigerant is rectified by passing through the gap, and noise due to turbulent flow is reduced.

  The flow of the refrigerant during heating has been described above. However, according to the present invention, the refrigerant can be rectified and the gas phase in the liquid phase is uniformly dispersed even during cooling in which the flow direction of the refrigerant is reversed. Thus, the flow noise is reduced as in heating.

  In the present invention, when the refrigerant passes through the gap between the inner surface of the casing and the magnet, the magnetic foreign matter in the refrigerant adheres to the magnet, and the throttle portion is prevented from being clogged. Even if the flow direction of the refrigerant is reversed between cooling and heating, the removal of foreign matter by the magnet is similarly expressed.

  Although the case where the electric control valve of the present invention is installed vertically has been described with reference to FIG. 1, the same effect can be obtained when the electric control valve is installed horizontally.

3 (a) and 3 (b) are cross-sectional views showing an embodiment of a magnet used in the present invention.
The magnet 2 is formed by forming a groove 2a in a magnetic pole (N pole or S pole) and flowing a refrigerant therethrough so that a magnetic foreign substance in the refrigerant adheres to the bottom of the groove 2a. It flows well in the groove until it is filled with foreign matter. In FIGS. 3 (a) and 3 (b), 2b is a peak.

In the invention according to claim 5, the reason why the inner surface of the housing is defined as a roughness having a maximum height Ry of 5 μm or more and an arithmetic average roughness Ra of 2 μm or more is that the gas phase is uniform in the gas-liquid two-phase refrigerant when the specified value is exceeded. This is because the refrigerant does not disperse and the flow noise of the refrigerant cannot be reduced sufficiently.
The maximum height Ry and the arithmetic average roughness Ra conform to JIS B 0601.

  The reason why the inner surface of the casing is roughened by sandblasting is that a uniform roughened surface can be easily obtained by sandblasting. A commercially available sandblasting machine can be applied to the sandblasting process.

  In the invention described in claim 7, as shown in FIG. 4 (a), the reason for defining the step d at the boundary between the valve seat portion 9 and the refrigerant outflow (entrance) portion 10b to be 1 mm or less (inner diameter difference is 2 mm or less) This is because when the step d exceeds 1 mm, the refrigerant pressure changes abruptly, the refrigerant enters a turbulent state, a large amount of bubbles (gas phase) is generated, and the flow noise increases. As shown in FIG. 4B, the flow noise decreases when the refrigerant outflow portion 10b is drawn. In FIG. 4A, 9b is a tapered portion.

  In the present invention, a metal material such as non-magnetic pure copper or copper alloy is preferably used for the casing, and pure copper is particularly recommended because of its excellent drawability. In addition, pure copper is suitably used for the refrigerant piping, brass for the valve seat, and stainless steel for the magnet holder of the stepping motor.

(A) is a longitudinal cross-sectional explanatory drawing which shows embodiment of the electrically-driven control valve of this invention, (b) is side explanatory drawing of a fixed spring. (A) And (b) is a cross-sectional explanatory drawing which shows the latching state of the latching | locking part of a cap wall part, and a moving spring one end extension part. (A) and (B) are cross-sectional explanatory views showing an embodiment of a magnet in the electric control valve of the present invention. (A) And (b) is a longitudinal cross-sectional explanatory drawing which shows embodiment of the boundary part of the valve seat part of this invention, and a refrigerant | coolant outflow part. It is a longitudinal cross-sectional explanatory drawing of the conventional electric control valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator core 2 Magnet 2a Groove part 2b formed in magnet Peak part 2c formed in magnet Magnet holder 3 Stepping motor 4 Valve body 4c Needle-like part 5 of valve body Common spring 6 Fixed spring 6a One end extension part of fixed spring ( stopper)
6b Extension end of stopper spring (stopper)
6c groove of fixed spring 7 moving spring 7a one end extending portion of moving spring 7b other end 8 of moving spring valve body 9 valve seat portion 9a valve seat 9b taper portion 10 housing 10a refrigerant inflow portion 10b refrigerant outflow portion 11 cap 11a Convex locking portion 11a ′ provided on the inner surface of the cap wall portion, top plate hole portion 11c spring washer of notched locking portion 11b cap provided on the cap wall portion

Claims (7)

  In the electric control valve in which the valve body moves in the axial direction with the rotation of the magnet of the stepping motor including the stator core and the magnet, and the needle-like portion at the end of the valve body adjusts the opening degree of the valve seat. A seat and a valve body are accommodated in a housing, a refrigerant flows in the housing, and a cap integrated with a magnet holder that holds the magnet and rotates together with the magnet is put on a predetermined portion of the valve body, Further, a common spring for stoppers on both sides of the opening and closing is arranged coaxially, the common spring is composed of a helical fixed spring and a moving spring, and the fixed spring is separated from the valve body and the magnet, and both ends of the fixed spring And one end of each of the moving springs is provided with an extending portion, the moving spring is rotatably fitted in the groove of the fixed spring, and the moving spring is provided with an extending portion at one end thereof on the cap wall portion. Engage with locking part As the magnet (cap) rotates, it moves in the axial direction along the fixed spring while rotating on the groove of the fixed spring, and the extension part or the other end part of the moving spring extends at both ends of the fixed spring. An electric control valve characterized in that the rotation of the cap and the magnet stops when contacted with any of the parts, and the movement of the valve body stops at the same time.   A refrigerant inflow (out) part is provided at one end of the casing, a refrigerant flow path is provided in a gap between the inner surface of the casing and the outer surface of the magnet, and a refrigerant outflow (inlet) part is provided at the other end of the casing. The electric control valve according to claim 1, wherein the electric control valve is provided.   The at least one of a refrigerant inflow (outlet) part at one end of the casing and a refrigerant outflow (inlet) part at the other end of the casing is formed by drawing the end of the casing. 2. The electric control valve according to 2.   The electric control valve according to claim 2 or 3, wherein a groove parallel to a flow direction of the refrigerant is provided in at least one of the inner surface of the refrigerant inflow (outlet) portion or the inner surface of the refrigerant outflow (inlet) portion.   5. The electric control according to claim 1, wherein the inner surface of the housing is roughened to a roughness having a maximum height Ry of 5 μm or more and an arithmetic average roughness Ra of 2 μm or more. valve.   The electric control valve according to any one of claims 1 to 5, wherein the inner surface of the casing is sandblasted.   The inner diameter of the tip of the portion (valve seat portion) where the valve seat is disposed is larger than the inner diameter of the refrigerant outflow (inlet) portion, and the difference is 2 mm or less. Further, the valve seat portion and the refrigerant The electric control valve according to any one of claims 1 to 6, wherein an inner surface of a boundary portion of the outflow (entrance) portion is formed in a taper shape.

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