JPH0478386A - Flow control valve - Google Patents

Abstract

PURPOSE:To enable large opening of a valve seat face and shorten length in the axial direction by converting the rotation of a rotor into the axial sliding of a needle valve to open/close the valve seat face, and providing rotation regulating plates rotatably supported on a shaft. CONSTITUTION:A shaft 13 is connected to a movable shaft 21, and the movable shaft 21 is screwed with its shaft supporting member 2. Accordingly, when a rotor 12 is rotated, the movable shaft 21 is rotated together with the rotor 12 and slided in the axial direction. When the rotor 12 is rotated clockwise, a needle valve 22 moves in the direction of approaching a valve seat 5. On the other hand, plural rotation regulating plates 25 supported on the shaft 13 are rotated in turn integrally with the rotor 12, and when the protrusion 26 of the rotation regulating plate 25 is finally brought into contact with the protruding part 29 of a rotor chamber 4, the rotor 12 is stopped. At this time, the needle valve 22 closes a valve seat face 5. When the rotor 12 is rotated reversely, the same above-mentioned rotation regulation is performed, and the needle valve 22 is separated from the valve seat face 5 at the time of the rotation of the rotor 12 being stopped so as to communicate a first and a second conducting ports 6, 8 with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention] (Field of Industrial Application) The present invention relates to an electric flow control valve used, for example, as an expansion valve in a refrigeration system.

(Prior Art) Conventionally, as this type of flow control valve, for example, <I OF
) An electric control valve described in Japanese Patent No. 1986-1.96477 is known. As shown in FIG. 3, this control valve has a valve body 40, a valve chamber 42 having a first conduction port [1] and a second conduction port communicating with a valve seat surface 41, and a coil 43 on the outer peripheral surface. A rotor chamber 44 is equipped with a rotor chamber 44, a male threaded pipe 45 is provided at the boundary between the valve chamber 42 and the rotor chamber 44, and a rotor 47 is provided with a female threaded pipe 46 in the center that is screwed into the male threaded pipe 45.
It is configured to include a needle valve 48 that slides within the male threaded pipe 45, opens and closes the valve seat surface 41, and has its base end attached to the center of the rotor 47.

In this control valve, when the coil 43 is energized, the rotor 47 rotates around the male threaded pipe 45, and as the rotor 47 rotates, the rotor 47 moves in the axial direction, so the needle valve 48 slides, and the needle valve 48 slides. The valve 48 opens and closes the valve seat surface 41.

In addition, it prevents the male threaded pipe 45 and the female threaded pipe 46 from getting caught due to overrotation of the rotor 47, and
In order to assist the rotation of the rotor 47, a guide rod 50 having a spiral guide protrusion piece 9 is provided on the other end surface of the rotor chamber 44, while the rotor 47 is guided by a guide protrusion piece 49. A slider 52 is fixed to which is attached a guide pin 51 that moves in the axial direction.

(Problems to be Solved by the Invention) However, for example, as shown in FIG.
In the structure of the control valve described in Japanese Patent No. 477, the lead angle of the spiral guide protrusion piece portion 49 of the guide rod 50 is thick ( Therefore, the length of this guide rod 50 becomes long, and the needle valve 48
In order to avoid contact between the rotor chamber 44 and the guide rod 50,
tends to increase in axial length.

Furthermore, since the rotor 47 is supported in a cantilevered manner by being screwed into the male threaded pipe 45, when the rotor 47 rotates, the rotor 47 makes an oscillating motion using the threaded part with the male threaded pipe as a fulcrum, and the rotor 47 There is also the problem that noise is generated due to contact with the inner surface of the rotor chamber 44.

Furthermore, when the diameter of the opening of the valve seat surface 41 is increased in order to increase the flow rate, the diameter of the needle valve 48 becomes larger and the diameter of the male threaded pipe 45 also becomes larger. Since the amount of movement in the axial direction of the valve seat surface 41 becomes smaller, there is also a problem that there is a limit to the opening radius of the valve seat surface 41.

An object of the present invention is to solve the above problems and provide a flow control valve that is small and has a large opening diameter on the valve seat surface.

[Structure of the invention]

(Means for Solving the Problems) The flow control valve of the present invention includes a substantially cylindrical rotor chamber having a coil attached to its outer circumferential surface, and a shaft supporting member provided at one end in the axial direction of the rotor chamber. a valve body comprising a valve chamber having a first communication port and a second communication port that communicate with a valve seat surface provided at one end facing the shaft supporting member; and an interior of the rotor chamber. and a rotor that rotates around a shaft that is pivotally supported by the closed end of the rotor chamber and the shaft support member; A needle valve that slides on the inner surface of the branch member and opens and closes the valve seat surface of the valve chamber, and a needle valve that is rotatably supported by the shaft and sequentially rotates integrally with the rotor as the rotor rotates. and a rotation regulating means having a plurality of rotation regulating plates for regulating the rotation.

(Function) In the flow control valve of the present invention, when the coil is energized, the rotor starts rotating depending on the state of energization to the coil, and the needle valve is connected to the shaft in the rotational direction due to the rotation of the rotor. Slides on the inner surface of the shaft support member in the axial direction.

Therefore, when the rotor is rotating so that the needle valve approaches the valve seat surface of the valve chamber, this rotor rotates integrally with the adjacent rotation regulating plate, and further integrally with the rotation regulating plate that is stopped sequentially. When all rotation regulating plates start rotating together with the rotor, the rotation of the rotor is stopped by a rotation regulating means in which the rotation regulating plates contact the rotor chamber and stop the rotation of the rotor, and the needle valve occlude the surface.

On the other hand, in this state, if the rotor rotates so that the needle valve moves away from the valve seat surface, the rotation of the rotor is stopped by the same rotation regulating means as described above, and the needle valve opens the valve seat surface. However, the first conduction port and the second conduction port are connected.

(Example) A flow control valve which is an example of the present invention is shown in Figs. 1 and 2.
This will be explained based on the diagram.

In FIG. 1, reference numeral 1 denotes a substantially cylindrical valve body, and a shaft supporting member 2 provided at a substantially mid-open portion connects a valve chamber 3 and a rotor chamber 4.
It is divided into.

The valve chamber 3 has a valve seat surface 5 formed at one end in the axial direction and is provided with a first communication port 6, a conduit 7 is connected to the first communication port 6, and a side surface is further provided with a first communication port 6. A second communication port 8 is provided, and a conduit 9 is connected to the second communication port 8 .

The shaft support member 2 is formed into a substantially cylindrical shape, and the shaft support member 2
On the inner circumferential surface of the rotor 12, a female threaded screw portion 11 is formed on the valve chamber 3 side, and a shaft support 14 for pivotally supporting the shaft 13 of the rotor 12 is formed on the rotor chamber 4 side.

The rotor chamber 4 has a coil 16 of a stepping motor mounted on its outer surface in the axial direction, and a shaft 13, which is a rotation axis of the rotor 12, is formed inside the rotor chamber 4 at the closed end of the rotor chamber 4. It is rotatably supported by the shaft support 17 and the shaft support 14 of the shaft support member 2. Further, a permanent magnet 18 is fixed to the side surface of the rotor 12, and the rotor 12 rotates depending on the state of energization of the coil 16.

Further, a moving shaft 21 having a male screw type threaded portion 20 on the outer surface is slidably screwed into the threaded portion 11 on the inner circumferential surface of the shaft support member 2, and the distal end of the moving shaft 21 Needle valve 22
is attached, and this needle valve 22 allows the valve seat surface 5 to be opened and closed freely. Furthermore, this needle valve 22
The valve seat surface 5 is biased by the coil IJ screw 23 to close it.

On the other hand, an engagement recess 2i that is coupled to the shaft 13 of the rotor 12 in the rotational direction of the shaft 13 is formed at the base end of the moving shaft 21.

Further, a plurality of rotation regulating plates 25 are rotatably supported on the shaft 13 between the closed end of the rotor chamber 4 and the rotor 12. As shown in FIG. 2, the rotation regulating plate 25 is formed into a substantially fan-shaped deck, and has a protruding piece 26 projecting in the axial direction on the surface facing the closed end of the rotor chamber 4.
are integrally formed. Furthermore, both substantially radial end edges serve as locking edges 27 on which the protruding piece portion 26 of the rotation regulating plate 25 adjacent to the valve chamber 3 side is locked. Also,
A protruding piece 28 is integrally formed on the surface of the rotor 12 that is in contact with the rotation regulating plate 25 and is engaged with the locking edge 27 of the rotation regulating plate 25 that is in contact with this surface. A protrusion piece 29 to which the protrusion piece 26 of the rotation regulating plate 25 closest to the closed end is engaged is formed integrally with the closed surface of the rotor chamber 4 .

Next, the operation of this embodiment will be explained.

When the coil 16 is energized, the rotor 12 rotates while the shaft 13 is supported by the shaft support 14 of the shaft support member 2 and the shaft support 17 of the rotor chamber 4. Since it is connected to the engagement recess 24, this moving shaft 21 is connected to the rotor 1 on the inner peripheral surface of the shaft support member 2.
Since the moving shaft 21 is screwed and held by the shaft supporting member 2, the moving shaft 21 can be slid in the axial direction.

Therefore, when the rotor 12 rotates clockwise toward the valve chamber 3 by energizing the coil 16, the needle valve 21 moves closer to the valve seat surface 5.

On the other hand, the protruding piece 28 of the rotor 12 that has started rotating comes into contact with one of the locking edges 27 of the adjacent rotation regulating plate 25, and this rotation regulating plate 25 starts rotating together with the rotor 12.

Further, when the protruding piece 26 of the rotating rotation regulating plate 25 rotates, the protruding piece 26 of the rotating rotation regulating plate 25 becomes one of the engagement members 1 of the rotation regulating plate 25 adjacent to the closed end side of the rotor chamber 4. - This rotation regulating plate 25 is also rotated together with the rotor 12 by being brought into contact with the edge 27. In this way, the rotation regulating plate 25 sequentially rotates integrally with the rotor 12, and finally, the protruding piece 26 of the rotation regulating plate 25 closest to the closed end of the rotor chamber 4 rotates at the closed end of the rotor chamber 4. Rotation of the rotor 12 is stopped when it comes into contact with a protruding piece 29 formed in the rotor 12. This rotor 1
The moving shaft 21 moves axially toward the valve seat surface 5 according to the amount of rotation of the needle valve 22, and the needle valve 22 closes the valve seat surface 5 while being biased by the coil spring 23.

Furthermore, when the rotor 12 rotates counterclockwise toward the valve chamber 3 by energizing the coil 1G from this state, the needle valve 22 moves away from the valve seat surface 5.

In this state, the protruding piece 28 of the rotor 12, which has started rotating, similarly to when the rotor 12 rotates clockwise,
The rotation regulating plate 25 comes into contact with the other locking edge 27 of the adjacent rotation regulating plate 25, and this rotation regulating plate 25 begins to rotate together with the rotor 12. Furthermore, the protruding piece 2 of this rotating rotation regulating plate 25
6 is a rotation regulating plate 2 adjacent to the closed end side of the rotor chamber 4;
The rotation regulating plate 25 also rotates together with the rotor 12 by being brought into contact with the other locking edge 27 of the rotor 12 . In this way, the rotation regulating plate 25 sequentially rotates integrally with the rotor 12, but finally, the protruding piece N26 of the rotation regulating plate 25 closest to the closed end side of the rotor chamber 4 is formed at the closed end of the rotor chamber 4. The rotation of the rotor 12 stops when it comes into contact with the protruding piece 29 that has been rotated. Since the needle valve 22 retreats from the valve seat surface 5 in the axial direction according to the amount of rotation of the rotor 12, the valve seat surface 5 is opened and the first communication port 6 and the second communication port 8 are communicated with each other. .

In this way, according to the above arrangement, the rotor 12 rotates while both ends of the shaft 13 serving as the axis are supported, so that the rotor 12 does not come into contact with the inner circumferential surface of the rotor chamber 4 when rotating. It rotates stably without being affected by external vibrations.

Furthermore, since rotation regulation for preventing over-rotation of the rotor 12 is performed by a rotation regulation means consisting of a plurality of rotation regulation plates 25, the length of the rotor chamber 4 in the axial direction can be shortened. In addition, the needle valve 2 that opens and closes the valve seat ff1i 5
2 is not housed inside the shaft 13 of the rotor 12, so there is no restriction on the opening diameter of the valve seat surface 5 [1 diameter or the diameter of the needle valve 22, and it is small and the valve opening [I has a large diameter and a large flow rate]. Flow control valves can be supplied.

〔Effect of the invention〕

According to the present invention, the rotor rotates while the shaft of the rotor is supported by the shaft supporting member and the closed end surface of the rotor chamber, and further, the rotation of the rotor is caused by the needle valve coupled to the shaft in the rotational direction of the rotor. The tip of the needle valve opens and closes the valve seat surface by sliding in the axial direction, so stable rotation of the rotor is obtained, and the opening diameter of the valve seat surface is not limited. .

Further, since over-rotation is prevented by the rotation regulating means consisting of a rotation regulating plate rotatably supported on the shaft, the axial length of the rotor chamber can be shortened.

Therefore, it is possible to provide a flow control valve that is small in size and has a large flow rate.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the flow control valve of the present invention, FIG. 2 is a perspective view of the same rotation regulating plate, and FIG. 3 is a longitudinal sectional view showing an example of a conventional flow control valve. . J... Valve body, 2... Shaft supporting material, 3... Valve chamber, 4... Rotor chamber, 5... Valve seat surface, 6... First conduction port, 8...
Second conduction port, 12... Rotor 13... Shaft, +
4. IT... shaft support, 16... coil, 22... needle valve, 25... rotation regulating plate.

Claims (1)

[Claims] (1) A substantially cylindrical rotor chamber with a coil attached to its outer circumferential surface, and a shaft support member provided at one end of the rotor chamber in the axial direction, and one end opposite the shaft support member. A valve body consisting of a valve chamber having a first communication port and a second communication port communicating with a provided valve seat surface, and a closed end of the rotor chamber and the shaft supporting member inside the rotor chamber. a rotor that rotates around a shaft that is pivotally supported by a rotor; and as the rotor rotates, the rotor is coupled to the shaft in the rotational direction and slides on the inner surface of the shaft supporting member in the axial direction, and the valve seat of the valve chamber is rotated. a needle valve that opens and closes a surface; and a rotation regulating means having a plurality of rotation regulating plates rotatably supported by the shaft, sequentially rotating together with the rotor as the rotor rotates, and regulating the rotation of the rotor. A flow control valve characterized by comprising: