JP7066496B2 - Solenoid valve and refrigeration cycle system - Google Patents

Description

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

Conventionally, an electric valve having a structure as shown in FIG. 8 has been known (see, for example, Patent Document 1). That is, when the stepping motor is driven and the rotor 103 is rotated, the valve body 114 moves in the valve central axis L direction, which is the central axis of the valve body 114, due to the screw feeding action of the female screw 131a and the male screw 121a. As a result, the opening degree of the valve port 130b is adjusted, and the flow rate of the fluid flowing in from the pipe joint 111 and flowing out to the pipe joint 112 or the flow rate of the fluid flowing in from the pipe joint 112 and flowing out to the pipe joint 111 is controlled. Will be done.

Here, in controlling the flow rate of various fluids, there is a problem that a fluid passing sound is generated, so that noise reduction is required. Further, in an indoor unit of a refrigerating cycle of a household air conditioner or a commercial air conditioner using a refrigerant, when the refrigerant flow rate is controlled by the electric valve 100, the liquid refrigerant is a gas-liquid mixed two-phase before and after passing through the valve port 130b. Since it is a flow, it is required to exhibit quietness even in various refrigerant conditions and operating conditions.

Japanese Unexamined Patent Publication No. 2016-0898770

By the way, the above-mentioned electric valve 100 is fixed to a fluid pipe (not shown) via a pipe joint 111 and a pipe joint 112, and has an angle type structure in which the center line of the pipe joint 111 and the center line of the pipe joint 112 intersect vertically. are doing. In such an angle type motorized valve 100, the fluid flows from both directions. That is, the fluid flows in the positive direction from the pipe joint 111 to the pipe joint 112 via the valve chamber 121 and the valve port 130b, and in the reverse direction from the pipe joint 112 to the pipe joint 111 via the valve port 130b and the valve chamber 121. Has a case of flowing to.

Here, as shown in FIG. 9, when the fluid flows in the opposite direction, the fluid passes upward through the valve body 114 and the valve guide 118 after passing through the valve port 130b, and flows upward along the valve body 114 and the valve guide 118, and the valve guide 118 and the female screw. It flows into the lower end opening 133a of the clearance 133 with the member 131 (see inside the circle T). In such a case, the fluid flowing into the lower end opening 133a of the clearance 133 vibrates the valve body portion 120. When the sound generated by this vibration is generated, it becomes difficult to maintain the quietness of the motorized valve 100.

An object of the present invention is to provide an electric valve capable of accurately maintaining quietness, and a refrigeration cycle system using the electric valve.

The motorized valve of the present invention
The rotary motion of the rotor housed in the inner circumference of the case is converted into a linear motion by the screw feed mechanism of the male screw member and the female screw member, and the valve body housed in the valve body based on this linear motion is described above. An electric valve that moves in the direction of the valve center axis, which is the center axis of the valve body.
The valve chamber, which is a space formed in the valve body,
A first valve port provided on the side surface of the valve body and serving as an entrance / exit on the valve chamber side,
A second valve port provided just below the valve body in the coaxial direction with the valve body and capable of approaching or separating the valve body.
The valve body is fixed to the second valve port side, and the valve guide is slidably arranged in the direction of the valve center axis, and the valve body portion including the valve body.
A valve shaft holder having a cylindrical accommodation chamber in which the valve body portion slides in the direction of the valve center axis is provided.
The valve body includes an inclined outer peripheral portion that forms a taper whose outer peripheral diameter increases toward the rotor side.
The valve shaft holder is extended toward the second valve port side, and includes an extension portion that forms a taper whose outer peripheral diameter increases toward the rotor side.
Regardless of where the valve body is movable
The lower end of the inner peripheral surface, which is the end on the second valve port side of the inner peripheral surface of the accommodation chamber, is
The inner diameter of the rotor-side end of the second valve port and
In the valve body portion protruding toward the second valve port side from the lower end of the inner peripheral surface, the valve center axis rather than the virtual line passing through the end portion on the second valve port side of the portion having the maximum outer diameter. Located on the directional side,
The lower end of the extension on the second valve port side has the smallest outer diameter of the valve shaft holder, and the maximum outer diameter of the valve body is on the second valve port side of the extension. Formed smaller than the outer diameter of the lower end ,
The taper angle of the inclined outer peripheral portion is larger than the taper angle of the extended portion and larger than 0 ° and smaller than 180 °.
The inner diameter of the end of the second valve port on the rotor side, the diameter of the lower end of the inclined outer peripheral portion on the second valve port side, the maximum outer diameter of the valve body, and the second valve port side of the extension portion. It is characterized in that the diameter increases in the order of the outer diameter of the lower end portion of the.

In this way, the lower end of the inner peripheral surface of the accommodation chamber of the valve shaft holder is located inside the virtual line, so that when the fluid flows in the opposite direction from the second valve port toward the valve chamber, the valve body portion. The flow direction of the hit fluid can be deflected from the lower end opening of the clearance formed between the valve guide and the valve shaft holder. Therefore, it is possible to suppress the inflow of fluid into the lower end opening of the clearance and reduce the vibration of the valve guide due to the fluid flowing into the lower end opening of the clearance. Further, by fixing the valve body to the valve guide, it is possible to suppress the valve body from vibrating in the valve guide due to the fluid. Therefore, the noise generated by the vibration of the valve guide can be alleviated, and the quietness can be accurately maintained.
In addition, by providing a taper on the valve shaft holder and valve body, when the fluid flows in the opposite direction from the second valve port toward the valve chamber, the fluid flows outward and is guided to deviate from the lower end opening of the clearance. can do. Further, by making the taper angle of the inclined outer peripheral portion larger than the taper angle of the extended portion, the flow of the fluid that hits the inclined outer peripheral portion during ascending changes in the direction away from the clearance, and the flow further changes. , It is guided to the outside of the outer peripheral surface of the extension portion. Further, by forming the valve shaft holder so that the outer diameter of the lower end portion of the valve shaft holder is the smallest, it is possible to suppress the inflow of fluid into the lower end opening of the clearance.

In addition, when the fluid flows in the opposite direction, the flow direction of the fluid that rises in the valve chamber and hits the valve body portion is changed at all valve openings that are the degree of opening between the valve body and the second valve port. It can be deflected from the lower end opening of the clearance. Therefore, it is possible to more accurately suppress the inflow of the fluid into the lower end opening of the clearance.

Further , the electric valve of the present invention is
The valve body
The needle part, which is a part close to the second valve port,
It is characterized by including an annular flat surface portion located on the outer periphery of the base end of the needle portion.

As a result, the valve body is urged upward by the fluid colliding with the annular flat surface portion, and the contact surface between the male and female threads in the screw feed mechanism can be kept constant, and screw play is suppressed. To. Furthermore, when the fluid hits the annular flat surface portion, the flow is changed in the outer diameter direction of the annular flat surface portion, and the fluid is suppressed from flowing into the lower end opening of the clearance to generate noise. Can maintain the quietness of.

Further , the refrigeration cycle system of the present invention is used.
A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, characterized in that the above-mentioned electric valve is used as the expansion valve.

According to the present invention, it is possible to provide an electric valve capable of accurately maintaining quietness, and a refrigeration cycle system using the electric valve.

It is a schematic sectional drawing of the electric valve which concerns on embodiment. It is an enlarged view of the main part of the electric valve which concerns on embodiment. It is a figure which shows the virtual line in the state which the valve body part is closest to the valve seat part in the electric valve which concerns on embodiment. It is a figure which shows the virtual line in the state which the valve body part is most separated from the valve seat part in the electric valve which concerns on embodiment. It is a figure which shows the virtual cone in the state which the valve body part is closest to the valve seat part in the electric valve which concerns on embodiment. It is a figure which shows the virtual cone in the state which the valve body part is most separated from the valve seat part in the electric valve which concerns on embodiment. It is a figure which shows the taper angle formed on the outer peripheral part of the extension part of a valve shaft holder, and the taper angle of the inclined outer peripheral part formed on a valve body in the electric valve which concerns on embodiment. It is a schematic sectional drawing of the conventional electric valve. It is an enlarged view of the main part of the conventional electric valve.

Hereinafter, the motorized valve according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the motorized valve 2 according to the embodiment. In addition, in this specification, "upper" or "lower" is defined in the state of FIG. That is, the rotor 4 is located above the valve body 17.

In the motorized valve 2, the valve body 30 is integrally connected to the lower side of the opening side of the case 60 having a cylindrical cup shape made of metal by welding or the like.
Here, the valve body 30 is made of a metal such as stainless steel, and has a valve chamber 11 which is a space formed inside. Further, a first pipe joint 12 made of, for example, stainless steel or copper, which directly communicates with the valve chamber 11, is fixedly mounted on the side surface of the valve body 30. On the valve chamber 11 side of the first pipe joint 12, a first valve port 12a having a circular cross section is formed as an inlet / outlet for fluid. Further, a valve seat portion 16 having a second valve port 16a having a circular cross section is incorporated in the inner bottom surface 30a of the valve body 30. The second valve port 16a is provided in the direction coaxial with the valve body 17 directly below the valve body 17. A second pipe joint 15 made of, for example, stainless steel or copper, which communicates with the first pipe joint 12 via the second valve port 16a and the valve chamber 11, is fixedly mounted on the valve seat portion 16.

A rotatable rotor 4 is housed in the inner circumference of the case 60, and a valve shaft 41 is arranged at a shaft core portion of the rotor 4 via a bush member 33. The rotor 4 is made of a magnetic material such as a resin material containing magnetic powder or a ferrite magnet. Both the bush member 33 and the valve shaft 41 are made of a metal such as stainless steel, and the valve shaft 41 and the rotor 4 coupled by the bush member 33 move integrally in the vertical direction while rotating. A male screw 41a is formed on the outer peripheral surface of the valve shaft 41 near the middle portion. In this embodiment, the valve shaft 41 functions as a male screw member. Further, the valve body 17 can be approached or separated from the second valve port 16a.

A stator composed of a yoke, a bobbin, a coil, and the like (not shown) is arranged on the outer periphery of the case 60, and a stepping motor is configured by the rotor 4 and the stator.
Below the bush member 33 of the valve shaft 41, a valve shaft holder 6 having a function of forming a screw feed mechanism A with the valve shaft 41 and suppressing the inclination of the valve shaft 41 as described later is a valve main body. It is fixed so as to be relatively non-rotatable with respect to 30.

The valve shaft holder 6 includes a cylindrical small diameter portion 6a on the upper side, a tubular large diameter portion 6b on the lower side, a fitting portion 6c accommodated on the inner peripheral portion side of the valve body 30, and a ring-shaped flange portion 6f. It is composed of an extension portion 6k extending below the fitting portion 6c (on the side of the second valve port 16a). The flange portion 6f of the valve shaft holder 6 is fixed to the upper end of the valve body 30 by welding or the like. A taper that increases upward (rotor 4 side) is formed on the outer circumference of the extension portion 6k, and the lower end portion of the extension portion 6k has the smallest outer diameter in the valve shaft holder 6. Further, inside the valve shaft holder 6, a storage chamber 6h for accommodating a valve guide 18 described later is formed. The valve shaft holder 6 is made of a resin material except for the metal flange portion 6f.

Further, a female screw 6d is formed downward from the upper opening 6g of the cylindrical small diameter portion 6a of the valve shaft holder 6 to a predetermined depth. Therefore, in the present embodiment, the valve shaft holder 6 functions as a female screw member. The screw feed mechanism A is composed of a male screw 41a formed on the outer periphery of the valve shaft 41 and a female screw 6d formed on the inner circumference of the cylindrical small diameter portion 6a of the valve shaft holder 6.

Further, a pressure equalizing hole 51 is formed on the side surface of the tubular large diameter portion 6b of the valve shaft holder 6, and the pressure equalizing hole 51 allows the accommodation chamber 6h in the tubular large diameter portion 6b and the rotor accommodation chamber. It communicates with 67 (second back pressure chamber). By providing the pressure equalizing hole 51 in this way, the space for accommodating the rotor 4 of the case 60 and the space inside the valve shaft holder 6 are communicated with each other, so that the valve body 17 can be smoothly moved. ..

Further, below the valve shaft 41, a cylindrical valve body portion 20 is slidably arranged with respect to the accommodating chamber 6h of the valve shaft holder 6. The valve body portion 20 includes a tubular valve guide 18 that slides in the accommodation chamber 6h, and a valve body 17 that adjusts the flow rate of the fluid passing through the second valve port 16a. The valve body 17 is fixed below the valve guide 18 and is held by the valve guide 18. Further, the compressed valve spring 27 and the spring receiver 35 are housed in the valve guide 18. The upper end of the spring receiver 35 is in point contact with the protruding portion 41c of the valve shaft 41.

The ceiling portion 21 side of the valve guide 18 is bent at a substantially right angle by press molding. A through hole 18a is formed in the ceiling portion 21. Further, a flange portion 41b is further formed below the valve shaft 41.

Here, the valve shaft 41 is freely inserted into the through hole 18a of the valve guide 18 so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction, and the flange portion 41b is a valve. It is arranged in the valve guide 18 so as to be rotatable with respect to the guide 18 and displaceable in the radial direction. Further, the valve shaft 41 is arranged so that the through hole 18a is inserted and the upper surface of the flange portion 41b faces the ceiling portion 21 of the valve guide 18. Since the flange portion 41b has a larger diameter than the through hole 18a of the valve guide 18, the valve shaft 41 is prevented from coming off.

Since the valve shaft 41 and the valve guide 18 can move in the radial direction to each other, the valve guide 18 and the valve guide 18 and the valve guide 18 and the valve guide 18 are not required to have a high degree of concentric mounting accuracy with respect to the arrangement position of the valve shaft holder 6 and the valve shaft 41. Concentricity with the valve body 17 can be obtained.
A washer 70 having a through hole formed in the central portion is installed between the ceiling portion 21 of the valve guide 18 and the flange portion 41b of the valve shaft 41.

Next, the main part of the motorized valve 2 according to the embodiment will be described. FIG. 2 is an enlarged view of a main part of the motorized valve 2 according to the embodiment. As shown in FIG. 2, the valve body 17 has a columnar fixing portion 17a fixed to the inner circumference of the valve guide 18, a substantially disk-shaped lid portion 17b for closing the lower end of the valve guide 18, and a substantially truncated cone shape. It is provided with a needle portion 17c having the shape of the above and having a function of adjusting the flow rate of the fluid passing through the second valve port 16a. The needle portion 17c is located at the lowermost part of the valve body 17 and protrudes below the lid portion 17b.

Then, as shown in FIG. 3, the lid portion 17b includes an annular flat surface portion 17d which is an annular plane located on the outer periphery of the base end 17c'of the needle portion 17c. Further, on the outer periphery of the annular flat surface portion 17d, an inclined outer peripheral portion 17e forming a taper whose outer peripheral diameter increases upward (rotor 4 side) is formed. Further, an annular portion 17g that is in contact with the lower end of the valve guide 18 and has the maximum outer diameter of the valve body 17 is formed at the upper end of the lid portion 17b. Further, a clearance 22 is formed between the outer circumference of the valve guide 18 and the inner circumference of the accommodation chamber 6h of the valve shaft holder 6.

Further, the lower end 6m (lower end on the second valve port 16a side) of the inner peripheral surface of the accommodation chamber 6h is the upper end inner diameter 16a'(inner diameter of the end portion on the rotor 4 side) of the second valve port 16a and the lower end outer circumference of the valve guide 18. It is located inside the virtual line P passing through 18b (on the valve center axis M direction side). Here, FIG. 3 shows a state in which the valve body 17 is closest to the valve seat portion 16, and FIG. 4 shows a state in which the valve body 17 is closest to the valve seat portion 16.

Further, as shown in FIGS. 3 and 4, the lower end 6 m of the inner peripheral surface of the accommodation chamber 6h exists inside the virtual line P regardless of the movable position of the valve body 17. As a result, when the fluid flows in the opposite direction from the second valve port 16a toward the inside of the valve chamber 11, the flow direction of the fluid that hits the valve body portion 20 can be deflected from the lower end opening 22a of the clearance 22. .. Therefore, the inflow of the fluid into the lower end opening 22a of the clearance 22 is suppressed.

Further, as shown in FIGS. 5 and 6, the electric valve 2 according to the present embodiment assumes a virtual cone Q in which the taper formed on the outer periphery of the extended portion 6k of the valve shaft holder 6 is extended downward. , A part of the valve body portion 20 is formed so as to protrude outside the virtual cone Q. As shown in FIG. 5, when the valve body 17 is closest to the valve seat portion 16, the valve guide 18, the fixing portion 17a, the lid portion 17b, and the needle portion 17c protrude outside the virtual cone Q. Further, as shown in FIG. 6, when the valve body 17 is most distant from the valve seat portion 16, the lower end outer peripheral portion 18b, the inclined outer peripheral portion 17e, and the annular portion 17g of the valve guide 18 protrude outside the virtual cone Q. (Refer to the circle W). In this way, a part of the valve body portion 20 always protrudes to the outside of the virtual cone Q, and among the fluids rising from the second valve port 16a into the valve chamber 11, the fluid that hits the valve body portion 20 is outside. It is possible to prevent the clearance 22 from going straight toward the lower end opening 22a.

Further, as shown in FIG. 7, the taper angle θ1 of the inclined outer peripheral portion 17e formed on the lid portion 17b of the valve body 17 is formed to be larger than the taper angle θ2 of the outer peripheral portion of the extension portion 6k. (Θ1> θ2). Further, the taper angle θ1 is set within a range larger than 0 ° and smaller than 180 ° (0 ° <θ1 <180 °). Here, the taper angle θ1 is defined as the taper angle θ1 between the two extension lines N when the extension lines N extending from the inclined outer peripheral portions 17e on both sides intersect at the valve center axis M in the cross-sectional view of the electric valve 2 shown in FIG. The angle of. Similarly, the taper angle θ2 is an angle between the two extension lines R when the extension lines R extending from the outer periphery of the extension portions 6k on both sides intersect at the valve center axis M.

In this way, by providing the extension portion 6k and the lid portion 17b with a taper, it is possible to guide the ascending fluid to flow outward and deviate from the clearance 22. Further, by making the taper angle θ1 of the inclined outer peripheral portion 17e larger than the taper angle θ2 of the extending portion 6k, the flow of the fluid that hits the inclined outer peripheral portion 17e during ascending is outside the lower end opening 22a of the clearance 22. Further, the flow is guided to the outside of the outer peripheral surface of the extension portion 6k.

Next, the flow of the fluid in the motorized valve 2 will be described. As shown in FIG. 2, when the fluid flows in the reverse direction from the second pipe joint 15 into the valve chamber 11 through the second valve port 16a of the valve seat portion 16, the fluid moves upward while changing the taper angle. It rises while flowing to the outside of the valve body 17 along the outer circumference of the needle portion 17c where the outer peripheral diameter becomes large. The ascending fluid is guided to flow largely to the outside of the valve body 17 by the inclined outer peripheral portion 17e whose outer peripheral diameter increases upward, and is prevented from flowing into the lower end opening 22a of the clearance 22.

As shown in FIGS. 3 and 4, the lower end 6m of the inner peripheral surface of the accommodation chamber 6h is located inside the virtual line P, and the outer diameter of the lower end of the extension 6k is the valve shaft holder 6. Since the outer diameter is formed to be the smallest among them, the rising fluid is accurately guided so as not to flow into the lower end opening 22a of the clearance 22. A part of the rising fluid is discharged to the first pipe joint 12 through the first valve port 12a, and the other part continues to rise further.

Further, the fluid that has risen in the valve chamber 11 is guided to flow outward again by the taper formed on the outer periphery of the extending portion 6k of the valve shaft holder 6. Therefore, as shown in FIG. 9, a part of the fluid colliding with the lower end surface 131a of the valve shaft holder (female screw member 131) is prevented from flowing into the lower end opening 133a of the clearance 133. The fluid continues to rise along the taper formed on the outer circumference of the extension portion 6k of the valve shaft holder 6, collides with the lower end surface of the fitting portion 6c of the valve shaft holder 6, and is folded back, and then the first pipe joint. It is discharged to 12.

According to the electric valve 2 according to this embodiment, by preventing the fluid from flowing into the lower end opening 22a of the clearance 22, the fluid flowing into the clearance 22 suppresses the vibration of the valve body portion 20. be able to. Therefore, the noise generated by the vibration of the valve body portion 20 can be alleviated, and the quietness can be accurately maintained.

Further, the valve body 17 is urged upward by the fluid colliding with the annular flat surface portion 17d on the way up, and the contact surface of the threads of the male screw 41a and the female screw 6d in the screw feed mechanism A can be kept constant. It is possible to suppress the occurrence of screw play. Further, when the fluid hits the annular flat surface portion 17d, the flow is changed in the outer diameter direction of the annular flat surface portion 17d, and the fluid is suppressed from flowing into the lower end opening portion 22a of the clearance 22 to generate noise. Therefore, the quietness of the motorized valve 2 can be accurately maintained.

Further, since the valve body 17 is fixed to the valve guide 18, the valve body 17 does not vibrate in the valve guide 18 due to the fluid, and the quietness of the motorized valve 2 can be maintained.

Further, in the above-described embodiment, the case where the outer diameter of the lower end outer peripheral 18b of the valve guide 18 is the maximum outer diameter of the valve body portion 20 is described as an example, but the outer diameter of the lower end outer peripheral 18b is not necessarily the valve. It is also assumed that the maximum outer diameter of the body portion 20 is not reached. In this case, the line passing through the lower end portion of the portion having the maximum outer diameter of the valve body portion 20 and the upper end inner diameter 16a'of the second valve port 16a may be a virtual line P. However, the valve body portion 20 in this case is a portion of the valve body portion 20 that protrudes below the lower end 6 m of the inner peripheral surface of the accommodation chamber 6h of the valve shaft holder 6.

Further, in the above-described embodiment, the annular flat surface portion 17d and the inclined outer peripheral portion 17e are assumed to be flat surfaces, but may have irregularities. Further, the annular plane portion 17d does not necessarily have to be a plane orthogonal to the valve central axis M, and may be inclined with respect to a plane orthogonal to the valve central axis M.

Further, the electric valve 2 of the above-described embodiment is used as an expansion valve provided between the condenser and the evaporator in a refrigeration cycle system including, for example, a compressor, a condenser, an expansion valve, an evaporator and the like. Be done.

2 Electric valve 4 Rotor 6 Valve shaft holder 6a Cylindrical small diameter part 6b Cylindrical large diameter part 6c Fitting part 6d Female screw 6f Flange part 6g Upper opening 6h Storage chamber 6k Extension part 6m Inner peripheral surface lower end 11 Valve chamber 12 1st pipe joint 12a 1st valve port 15 2nd pipe joint 16 Valve seat part 16a 2nd valve port 16a'Upper end inner diameter 17 Valve body 17a Fixed part 17b Lid part 17c Needle part 17c' Base end 17d Circular flat surface part 17e Inclined outer circumference Part 17g Ring part 18 Valve guide 18a Through hole 18b Lower end outer circumference 20 Valve body part 21 Ceiling part 22 Clearance 22a Lower end opening 27 Valve spring 30 Valve body 30a Internal bottom surface 33 Bush member 41 Valve shaft 41a Male screw 41b Fitting part 41c Protruding part 51 Pressure equalizing hole 60 Case 67 Rotor accommodating chamber 70 Washer 100 Electric valve 103 Rotor 111 First pipe fitting 112 Second pipe fitting 114 Valve body 118 Valve guide 120 Valve body 121 Valve chamber 121a Male screw 130b Valve port 131 Female thread member 131a Female thread 133 Clearance 133a Lower end opening L Valve center axis M Valve center axis N Extension line P Virtual line Q Virtual cone R Extension line θ1 Inclined outer peripheral portion 17e taper angle θ2 Extension portion 6k outer peripheral taper angle

Claims (3)

The rotary motion of the rotor housed in the inner circumference of the case is converted into a linear motion by the screw feed mechanism of the male screw member and the female screw member, and the valve body housed in the valve body based on this linear motion is described above. An electric valve that moves in the direction of the valve center axis, which is the center axis of the valve body.
The valve chamber, which is a space formed in the valve body,
A first valve port provided on the side surface of the valve body and serving as an entrance / exit on the valve chamber side,
A second valve port provided just below the valve body in the coaxial direction with the valve body and capable of approaching or separating the valve body.
The valve body is fixed to the second valve port side, and the valve guide is slidably arranged in the direction of the valve center axis, and the valve body portion including the valve body.
A valve shaft holder having a cylindrical accommodation chamber in which the valve body portion slides in the direction of the valve center axis is provided.
The valve body includes an inclined outer peripheral portion that forms a taper whose outer peripheral diameter increases toward the rotor side.
The valve shaft holder is extended toward the second valve port side, and includes an extension portion that forms a taper whose outer peripheral diameter increases toward the rotor side.
Regardless of where the valve body is movable
The lower end of the inner peripheral surface, which is the end on the second valve port side of the inner peripheral surface of the accommodation chamber, is
The inner diameter of the rotor-side end of the second valve port and
In the valve body portion protruding toward the second valve port side from the lower end of the inner peripheral surface, the valve center axis rather than the virtual line passing through the end portion on the second valve port side of the portion having the maximum outer diameter. Located on the directional side,
The lower end of the extension on the second valve port side has the smallest outer diameter of the valve shaft holder, and the maximum outer diameter of the valve body is on the second valve port side of the extension. Formed smaller than the outer diameter of the lower end ,
The taper angle of the inclined outer peripheral portion is larger than the taper angle of the extended portion and larger than 0 ° and smaller than 180 °.
The inner diameter of the end of the second valve port on the rotor side, the diameter of the lower end of the inclined outer peripheral portion on the second valve port side, the maximum outer diameter of the valve body, and the second valve port side of the extension portion. An electric valve characterized in that the diameter increases in the order of the outer diameter of the lower end of the. The valve body is
The needle part, which is a part close to the second valve port,
The motorized valve according to claim 1 , further comprising an annular flat surface portion located on the outer periphery of the base end of the needle portion. A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the electric valve according to claim 1 or 2 is used as the expansion valve.

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