JP7349538B2 - Electric 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. 5 has been known (for example, see Patent Document 1). That is, when the stepping motor is driven and the rotor 103 rotates, the valve body 114 moves in the direction of the central axis L 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 fitting 111 and flowing out from the pipe fitting 112, or the flow rate of the fluid flowing in from the pipe fitting 112 and flowing out from the pipe fitting 111, is controlled. be done.

Here, when controlling the flow rate of various fluids, there is a problem in that fluid passage noise is generated, so noise reduction is required. In addition, when controlling the refrigerant flow rate with the electric valve 100 in an indoor unit of the refrigeration cycle of a home air conditioner or a commercial air conditioner that uses a refrigerant, the liquid refrigerant is mixed into a two-phase gas-liquid mixture before and after passing through the valve port 130b. In particular, it is required to exhibit quietness under a wide variety of refrigerant conditions and operating conditions.

JP2016-089870A

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 the valve body 114 and the valve port 130b of the valve seat 130 are exposed in the flow path. Therefore, in the electric valve 100, when a high pressure difference occurs between the inlet side and the outlet side of the valve port 130b, especially when the flow flows from the pipe fitting 111 to the pipe fitting 112, as shown in FIG. , fluid such as refrigerant flowing from the pipe joint 111 hits the valve body 114, and the valve body 114 may vibrate in the radial direction (C) due to the collision force. When noise is generated due to this vibration, it may become impossible to maintain the quietness of the electric valve 100.

Here, as shown in FIG. 7, it is possible to create a structure in which the fluid flowing into the valve chamber 121 from the pipe joint 111 does not directly hit the valve body 114 by raising the position of the top surface 130a of the valve seat 130. It will be done. However, in this case, since most of the fluid that hits the valve body 114 flows upward, an upward force is applied to the valve body 114, causing the valve body 114 to vibrate in the vertical direction (E). Therefore, in this case as well, it becomes difficult to maintain quietness.

An object of the present invention is to provide a motor-operated valve that can accurately maintain quietness, and a refrigeration cycle system using the motor-operated valve.

The electric valve of the present invention is
The rotational motion of the rotor housed in the inner periphery of the case is converted into linear motion by the screw engagement between the male threaded member and the female threaded member, and based on this linear motion, the valve body housed in the valve body is pivoted. An electric valve that moves in the direction,
a first port opened on a side surface of the valve body;
a valve seat member having a flat top surface with a valve port opened so that the valve body can approach or separate;
a second port communicating with the first port via the valve port,
The axial direction of the top surface of the valve seat member is configured such that the fluid flowing into the valve chamber in the valve body from the first port is branched toward the rotor side and the second port side of the valve body. is located at a height that does not exceed the uppermost end of the inner diameter of the first port on the rotor side with respect to the central axis of the first port,
The valve chamber in the valve body includes a first space formed closer to the rotor than the first port in the axial direction, and a first space formed closer to the second port than the first port in the axial direction. A second space is included.
Furthermore, the electric valve of the present invention has
The rotational motion of the rotor housed in the inner periphery of the case is converted into linear motion by the screw engagement between the male threaded member and the female threaded member, and based on this linear motion, the valve body housed in the valve body is pivoted. An electric valve that moves in the direction,
a first port opened on a side surface of the valve body;
a valve seat member having a flat top surface with a valve port opened so that the valve body can approach or separate;
a second port communicating with the first port via the valve port,
The position of the top surface of the valve seat member in the axial direction is closer to the rotor than the central axis of the first port, and the extension line of the central axis of the first port and the outer peripheral surface of the valve seat member intersect, and the position of the top surface of the valve seat member in the axial direction is located at a height that does not exceed the uppermost end of the inner diameter of the first port,
The valve chamber in the valve body includes a first space formed closer to the rotor than the first port in the axial direction, and a first space formed closer to the second port than the first port in the axial direction. and a second space,
The position of the seating tapered surface of the valve body in the axial direction is located closer to the rotor than the uppermost end of the inner diameter of the first port when the valve is fully open.

According to this, by raising the position of the top surface of the valve seat member, it is possible to prevent the fluid flowing in from the first port from colliding directly with the valve body, thereby suppressing radial vibration of the valve body. be able to. Additionally, by providing a second space in addition to the first space within the valve body, all of the fluid that has flowed in from the first port flows upward, applying upward force to the valve body, causing the valve body to move in the axial direction. Vibration can be suppressed. In this way, by reducing the load on the valve body, vibrations of the valve body in the radial and axial directions can be reduced, and the quietness of the electric valve can be accurately maintained.
Further, the fluid flowing in from the first port can be accurately distributed vertically and guided to the first space and the second space.

Furthermore, the electric valve of the present invention has
The valve body is characterized in that an inner diameter is larger than an inner diameter of the first port .
Thereby, a place for the fluid to escape can be ensured accurately.

Furthermore, the electric valve of the present invention has
The lowermost end of the inner diameter of the first port is located closer to the rotor than the inner bottom surface of the valve body.
Thereby, the upward flow of the fluid flowing in from the first port can be more accurately suppressed.

Furthermore, the electric valve of the present invention has
The axial distance between the central axis of the first port and the lower end surface of the valve stem holder is the radial distance between the outer peripheral surface of the valve seat member and the end of the first port on the valve chamber side. and the axial distance between the central axis of the first port and the bottom surface of the valve body is greater than the distance between the outer peripheral surface of the valve seat member and the end of the first port on the valve chamber side. It is characterized by being larger than the radial distance between the two parts.
Furthermore, the electric valve of the present invention has
The top surface of the valve seat member has an annular shape and is connected to an outer peripheral edge of the valve seat member.

Furthermore, the refrigeration cycle system of the present invention includes:
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 invention according to the present invention, it is possible to provide an electric valve that can accurately maintain quietness, and a refrigeration cycle system using the electric valve.

It is a schematic sectional view of the electric valve concerning an embodiment. FIG. 2 is an enlarged view of main parts of the electric valve according to the embodiment. FIG. 2 is a side view of main parts of the electric valve according to the embodiment. It is a figure showing the top surface of the valve seat member visually recognized from the inside of the 1st pipe fitting connected to the electric valve concerning an embodiment. FIG. 2 is a schematic cross-sectional view of a conventional electric valve. FIG. 2 is an enlarged view of the main parts of a conventional electric valve. FIG. 2 is an enlarged view of the main parts of an electric valve as a comparative example.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, the electric valve based on embodiment of this invention is demonstrated. FIG. 1 is a schematic cross-sectional view showing an electric valve 2 according to an embodiment. Note that in this specification, "upper" and "lower" are defined in terms of the state shown in FIG. That is, the rotor 4 is located above the valve body 17.

In this electric valve 2, a valve body 30 is integrally connected by welding or the like to the lower part of the opening side of a metal case 60 in the shape of a cylindrical cup.
Here, the valve body 30 is made of metal such as stainless steel, and has a valve chamber 11 therein. Further, a first pipe joint 12 made of stainless steel or copper, for example, is fixedly attached to the valve body 30 and directly communicates with the valve chamber 11 . Further, a valve seat member 16 in which a valve port 16a having a circular cross section is formed is incorporated into the bottom surface of the valve body 30. A second pipe joint 15 made of stainless steel or copper, for example, is fixedly attached to the valve seat member 16 and communicates with the first pipe joint 12 through the valve port 16a and the valve chamber 11.

A rotatable rotor 4 is housed in the inner periphery of the case 60, and a valve shaft 41 is disposed at the axial center of the rotor 4 via a bushing member 33. Note that the rotor 4 is made of a magnetic material such as a resin material containing magnetic powder or a ferrite magnet. Both the bushing member 33 and the valve shaft 41 are made of metal such as stainless steel, and the valve shaft 41 and the rotor 4, which are connected by the bushing member 33, move integrally in the vertical direction while rotating. Note that a male thread 41a is formed on the outer circumferential surface of the valve shaft 41 near the intermediate portion. In this embodiment, the valve shaft 41 functions as a male threaded member. Further, the valve body 17 can be moved close to or separated from the valve port 16a.

A stator consisting of a yoke, a bobbin, a coil, etc. (not shown) is arranged around the outer periphery of the case 60, and the rotor 4 and the stator constitute a stepping motor.
Below the bushing member 33 of the valve stem 41, a valve stem holder 6, which forms a screw feed mechanism A with the valve stem 41 and has a function of suppressing the inclination of the valve stem 41 as described later, is attached to the valve body. 30 so as not to rotate.

This valve stem holder 6 includes a small diameter cylindrical portion 6a on the upper side, a large diameter cylindrical portion 6b on the lower side, a fitting portion 6c housed in the inner circumference of the valve body 30, and a ring-shaped flange portion 6f. Consisting of The flange portion 6f of the valve stem holder 6 is fixed to the upper end of the valve body 30 by welding or the like. Further, inside the valve stem holder 6, a housing chamber 6h is formed to accommodate a valve guide 18, which will be described later. Note that the valve stem holder 6 is made of a resin material except for the metal flange portion 6f.

Further, a female thread 6d is formed downward from the upper opening 6g of the cylindrical small diameter portion 6a of the valve stem holder 6 to a predetermined depth. Therefore, in this embodiment, the valve stem holder 6 functions as a female screw member. A screw feeding mechanism A is constituted by a male thread 41a formed on the outer periphery of the valve stem 41 and a female thread 6d formed on the inner periphery of the cylindrical small diameter portion 6a of the valve stem holder 6.

Further, a pressure equalizing hole 51 is bored in the side surface of the cylindrical large diameter portion 6b of the valve stem holder 6, and the pressure equalizing hole 51 connects the valve stem holder chamber 83 in the cylindrical large diameter portion 6b to the rotor. It communicates with the storage chamber 67 (second back pressure chamber). By providing the pressure equalizing hole 51 in this manner, the space in which the rotor 4 of the case 60 is accommodated communicates with the space in the valve stem holder 6, thereby allowing the valve body 17 to move smoothly. .

Further, below the valve stem 41, a cylindrical valve guide 18 is arranged so as to be slidable with respect to the accommodation chamber 6h of the valve stem holder 6. The valve guide 18 is bent at a substantially right angle on the ceiling portion 21 side by press molding. A through hole 18a is formed in this ceiling portion 21. Furthermore, a flange portion 41b is further formed below the valve shaft 41.

Here, the valve shaft 41 is inserted into the through hole 18a of the valve guide 18 in a loose state so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction, and the collar portion 41b is connected to the valve shaft 41. It is arranged within the valve guide 18 so as to be rotatable relative to the guide 18 and displaceable in the radial direction. Further, the valve shaft 41 is inserted through the through hole 18a, and the upper surface of the collar portion 41b is arranged to face the ceiling portion 21 of the valve guide 18. Note that the valve shaft 41 is prevented from coming off because the collar portion 41b has a larger diameter than the through hole 18a of the valve guide 18.

Since the valve stem 41 and the valve guide 18 are movable relative to each other in the radial direction, the valve stem holder 6 and the valve stem 41 are not required to have a very high level of concentric mounting accuracy, and the valve guide 18 and the valve guide 18 can be moved in the radial direction. Concentricity with the valve body 17 is obtained.
A washer 70 having a through hole formed in the center is installed between the ceiling part 21 of the valve guide 18 and the collar part 41b of the valve shaft 41.

Next, main parts of the electric valve 2 according to the embodiment will be explained. FIG. 2 is an enlarged view of main parts of the electric valve 2 according to the embodiment. As shown in FIG. 2, a valve chamber 11 is formed in the valve body 30. In this embodiment, the valve chamber 11 is divided into three spaces described below. That is, in the direction of the axis M, the valve chamber 11 includes a first space 11a formed at a position above the first pipe joint 12 (rotor 4 side), and a first space 11a formed at a position below the first pipe joint 12 (second pipe). A second space 11b formed at the position of the joint 15 side) and a third space 11c formed at the same level as the first pipe joint 12 are included. Here, the upper side of the first pipe joint 12 more specifically refers to the upper side of the uppermost end X1 of the outer diameter of the first pipe joint 12. Similarly, the lower side than the first pipe joint 12 refers to the lower side than the lowermost end X2 of the outer diameter of the first pipe joint 12.

Further, the first space 11a is a substantially cylindrical space, and the upper part thereof is in contact with the lower part of the valve shaft holder 6 and the valve body 17.
Further, the second space 11b is a substantially annular space and is formed around the valve seat member 16. This second space 11b is formed by attaching the lowermost outer diameter end X2 of the first pipe joint 12 above the bottom surface 30a of the valve body 30. More preferably, the first pipe joint 12 is installed such that the depth (L) of the second space 11b is deeper than the radius (D/2) of the inner diameter of the first pipe joint (L>D/ 2).

Further, in the electric valve 2 according to the embodiment, a valve seat member 16 having a high height is used. Specifically, when the valve seat member 16 is fixedly attached to the second pipe joint 15, the position of the top surface 16b in the direction of the axis M is located above the position of the central axis N of the first pipe joint 12. The one that does is used.

Moreover, as shown in FIG. 3, the top surface 16b is preferably located at a height that allows it to be visually recognized when the inside of the first pipe joint 12 is viewed from the direction of the arrow (B) in FIG. That is, in the direction of the axis M, the valve seat member 16 is preferably arranged at a position where the top surface 16b does not exceed the uppermost end of the inner diameter of the first pipe joint 12. In this case, as shown in FIG. 4, if the lowest end of the inner diameter of the first pipe joint 12 is used as the vertical reference, the position (H) of the top surface 16b is the position (D) of the central axis N of the first pipe joint 12. /2) and is located below the uppermost end (D) of the inner diameter of the first pipe joint 12 (D/2<H<D).

Here, as shown in FIG. 2, the speed of the fluid flowing into the valve chamber 11 from the first pipe joint 12 is fastest at the center and becomes slower as it approaches the inner periphery of the first pipe joint 12. Therefore, if the top surface 16b is located below the central axis N of the first pipe joint 12, the fluid at a high velocity will directly hit the valve body 17, causing a large radial load on the valve body 17. This causes the valve body 17 to vibrate in the radial direction.

On the other hand, when the top surface 16b is located at the position (D/2<H<D) described using FIG. 4 as in the electric valve 2 according to the embodiment, as shown in FIG. First, the fastest part of the fluid once collides with the outer periphery of the valve seat member 16, reduces its speed, and branches in the vertical direction. The fluid branched upward is introduced into the first space 11a, and the fluid branched downward is introduced into the second space 11b.

Here, in the electric valve 2 according to the embodiment, since the height of the top surface 16b is not located too high, the force (see FIG. 7) applied upwardly to the valve body 17 by the fluid branched upward is also reduced. reduced.

Furthermore, since the second space 11b is provided below the valve chamber 11, an escape path for the fluid branched downward is ensured. This prevents the fluid branched downward from losing its escape and flowing upward, thereby suppressing the application of upward force to the valve body 17.

Furthermore, in the electric valve 2 according to the embodiment, the inner diameter Y (see FIG. 2) of the valve body 30 is formed to be larger than the inner diameter (D) of the first pipe joint 12 (Y>D). . Therefore, an escape area for the fluid that has flowed into the valve chamber 11 can be accurately secured.

According to the electric valve 2 in this embodiment, by raising the position of the top surface 16b of the valve seat member 16, it is possible to prevent the fluid flowing in from the first pipe joint 12 from colliding directly with the valve body 17. Therefore, vibration of the valve body 17 in the radial direction can be suppressed. Furthermore, by providing the second space 11b in addition to the first space 11a within the valve body 30, all of the fluid that has flowed in from the first pipe joint 12 flows upward, and an upward force is applied to the valve body 17. Vibration of the valve body 17 in the direction of the axis M can be suppressed. In this way, by reducing the load on the valve body 17, vibrations in the radial and axial directions of the valve body 17 can be reduced, and even in various fluid controls, it is possible to reduce the load on the valve body 17. The quietness of the motor-operated valve 2 can also be accurately maintained even in the above-mentioned conditions.

In addition, since the electric valve 2 can maintain its quietness by simply raising the position of the top surface 16b of the valve seat member 16, the structure of the electric valve 2 does not have to be complicated, and furthermore, the structure of the electric valve 2 does not need to be complicated. Since it is not used, the quietness of the electric valve 2 can be maintained at low cost.

Further, the electric valve 2 of the above-described embodiment is used, for example, as an expansion valve provided between a condenser and an evaporator in a refrigeration cycle system consisting of a compressor, a condenser, an expansion valve, an evaporator, etc. It will be done.

2 Motor operated valve 6d Female thread 11 Valve chamber 11a First space 11b Second space 11c Third space 12 First pipe joint 15 Second pipe joint 16 Valve seat member 16a Valve port 16b Top surface 17 Valve body 18 Valve guide 30 Valve body 30a Bottom surface 41a Male thread M Axis N of electric valve 2 Central axis X1 of first pipe fitting 12 Uppermost end of outer diameter of first pipe fitting 12 X2 Lowermost end of outer diameter of first pipe fitting 12 Inner diameter of valve body 30

Claims (7)

The rotational motion of the rotor housed in the inner periphery of the case is converted into linear motion by the screw engagement between the male threaded member and the female threaded member, and based on this linear motion, the valve body housed in the valve body is pivoted. An electric valve that moves in the direction,
a first port opened on a side surface of the valve body;
a valve seat member having a flat top surface with a valve port opened so that the valve body can approach or separate;
a second port communicating with the first port via the valve port,
The axial direction of the top surface of the valve seat member is configured such that the fluid flowing into the valve chamber in the valve body from the first port is branched toward the rotor side and the second port side of the valve body. is located at a height that does not exceed the uppermost end of the inner diameter of the first port on the rotor side with respect to the central axis of the first port,
The valve chamber in the valve body includes a first space formed closer to the rotor than the first port in the axial direction, and a first space formed closer to the second port than the first port in the axial direction. An electrically operated valve comprising: a second space in which The rotational motion of the rotor housed in the inner periphery of the case is converted into linear motion by the screw engagement between the male threaded member and the female threaded member, and based on this linear motion, the valve body housed in the valve body is pivoted. An electric valve that moves in the direction,
a first port opened on a side surface of the valve body;
a valve seat member having a flat top surface with a valve port opened so that the valve body can approach or separate;
a second port communicating with the first port via the valve port,
The position of the top surface of the valve seat member in the axial direction is closer to the rotor than the central axis of the first port, and the extension line of the central axis of the first port and the outer peripheral surface of the valve seat member intersect, and the position of the top surface of the valve seat member in the axial direction is located at a height that does not exceed the uppermost end of the inner diameter of the first port,
The valve chamber in the valve body includes a first space formed closer to the rotor than the first port in the axial direction, and a first space formed closer to the second port than the first port in the axial direction. and a second space,
The motor-operated valve is characterized in that the position of the seating tapered surface of the valve body in the axial direction is closer to the rotor than the uppermost end of the inner diameter of the first port when the valve is fully open. The electric valve according to claim 1 or 2, wherein the inner diameter of the valve body is larger than the inner diameter of the first port. The motor-operated valve according to any one of claims 1 to 3, wherein the lowermost end of the inner diameter of the first port is located closer to the rotor than the inner bottom surface of the valve body. The axial distance between the central axis of the first port and the lower end surface of the valve stem holder is the radial distance between the outer peripheral surface of the valve seat member and the end of the first port on the valve chamber side. and the axial distance between the central axis of the first port and the bottom surface of the valve body is greater than the distance between the outer peripheral surface of the valve seat member and the end of the first port on the valve chamber side. The motor-operated valve according to any one of claims 1 to 4, wherein the motor-operated valve is larger than the radial distance between the motor-operated valve and the motor-operated valve. The electric valve according to any one of claims 1 to 5, wherein the top surface of the valve seat member has an annular shape and is connected to an outer peripheral edge of the valve seat member. A refrigeration cycle system comprising a compressor, a condenser, an expansion valve, and an evaporator, characterized in that the electric valve according to any one of claims 1 to 6 is used as the expansion valve. .

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