JP4633943B2 - Electric switching valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric switching valve used by being incorporated in an air conditioner or the like, and more particularly to an electric switching valve suitable for switching the flow of a fluid (refrigerant) between a large flow rate and a small flow rate.
[0002]
[Prior art]
Conventionally, an electric valve used by being incorporated in this type of air conditioner, refrigerator, etc. is a device that adjusts the flow rate of a fluid such as a refrigerant, and usually includes a valve body having a valve chamber and a valve seat, A cylindrical can with a bottom fixed to the upper part of the valve body through a hook-shaped portion, and a rotor is built inside the can, and an insertion hole is formed in the center portion outside the can. The stator which has is externally fitted. FIG. 4 is a longitudinal sectional view of the conventional motor-operated valve 1 as described above. The valve body 2 includes a valve chamber 2c, a guide bush fixing portion 2d, and a can fixing portion 2e. Are provided with fluid inlet / outlet pipes 2a and 2b through which a fluid such as a refrigerant enters and exits, and a valve seat 2f to which a needle valve, which is a valve body 3a formed at the tip of the valve shaft 3, is contacted and separated. ing.
[0003]
The guide bush fixing portion 2d is located above the valve chamber, and fixes the valve body 2 and the guide bush 4. A female screw portion 4a is formed on the inner periphery of the guide bush 4, and a male screw portion 5a formed on the outer periphery of the valve element holder 5 is screwed into the female screw portion 4a. A screw feed mechanism is formed by the female screw portion and the male screw portion. Is configured. And in this valve body holder 5, the valve shaft 3 which forms the valve body 3a in the lower end part is slidably fitted, and this valve shaft 3 is shrunk in the valve body holder 5 inside. It is always urged downward by the compression coil spring 3b.
[0004]
The can fixing portion 2e is located at the upper end of the valve body 2 and is composed of a ring-shaped metal plate whose inner peripheral surface is fixed by caulking and whose lower end surface is joined by welding. The can 6 is fixed to the valve body 2 by welding to the valve body. The valve shaft 3 and the rotor 7 are coupled to each other by fitting the valve body holder 5 and the male screw portion 5a to the valve shaft 3 and fitting the valve shaft holder 5 to the rotor 7 with a permanent magnet. A push nut 3 c is press-fitted and fixed to the upper end of the valve shaft 3, and its flange portion is coupled to the rotor 7 while allowing the valve shaft 3 to move slightly up and down. The lower stopper 4b fixed to the valve body holder 5 and the upper stopper 5b formed on the sleeve constitute a stopper mechanism.
[0005]
A rotor 7 is built in the can 6, and a stator 8 is fitted on the outside of the can 6. A stator coil 8 a and a yoke 8 b are stored in the stator 8 in the vertical direction, and the stator coil 8 a is energized through a lead wire 8 c and a connector 8 d provided on the outer periphery of the stator 8. The yoke 8b is excited by energization of the stator coil 8a to rotate the rotor 7, and the valve body holder 5 and the valve shaft 3 are slid by a screw feed mechanism to open and close to adjust the refrigerant flow rate. . A connector cover 8e is welded to the stator 8.
[0006]
[Problems to be solved by the invention]
By the way, in said prior art, the difference in the refrigerant | coolant pressure with respect to the valve body 3a comes out according to the direction of the normal / reverse flow of a refrigerant | coolant, As a result, the difference in the flow volume comes out according to the direction of the refrigerant | coolant flow. There is a bug. That is, in FIG. 4 , when the refrigerant flows from the fluid inlet / outlet pipe 2a to the fluid inlet / outlet pipe 2b, the refrigerant pressure acts downward with respect to the valve body 3a. Therefore, the gap with the valve body 2 is small. On the other hand, when the fluid flows from the fluid inlet / outlet pipe 2b to the fluid inlet / outlet pipe 2a, the refrigerant pressure acts upward with respect to the valve body 3a. Therefore, there is a problem that the gap with the valve body 2 becomes large and the flow rate is increased accordingly.
[0007]
The present invention has been made in view of such a problem, and an object of the present invention is to provide electric switching that can accurately obtain a desired flow rate without being affected by the flow direction of a fluid such as a refrigerant. To provide a valve.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an electric switching valve according to the present invention comprises the following means.
That is, the electric switching valve of the present invention includes a valve body having a valve chamber in which a valve body is disposed, a pair of fluid inlet / outlet pipes provided in the valve body so as to communicate with the valve chamber, A rotor for rotating the valve body around the center, a can fixed to the valve main body so as to incorporate the rotor, and a stator that is externally fitted to the can and rotationally drives the rotor; The pair of fluid inlet / outlet pipes are disposed on a bottom surface portion of the valve body, and the valve body is an oscillating body that rotates and displaces on the inner bottom surface of the valve body in the valve chamber, and the rotation of the rotor The throttle is oscillated and displaced between two positions selectively covering one of the fluid inlet / outlet pipes and a position where both of the fluid inlet / outlet pipes are opened, and the throttle body communicates with the flow path of the opposing fluid inlet / outlet pipe. A hole is provided.
[0009]
The electric switching valve according to the present invention having the above configuration is less susceptible to the flow direction of a fluid such as a refrigerant.
[0010]
In other words, the electric switching valve configured as described above has the same amount of leakage regardless of whether the flow of fluid such as refrigerant is in the forward or reverse direction. Realization of accurate flow rate control. Further, in addition to the above function, the fluid pressure presses the valve body against the valve body regardless of whether the fluid flow is in the forward or reverse direction, so that fluid leakage from the valve chamber to the flow path is minimal.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
[Example 1]
An embodiment of an electric switching valve 10 of Example 1 according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view (A) of a main part with a stator removed showing a state of a minimum flow rate in the positive direction of an electric switching valve according to a first embodiment of the present invention, and a valve element position explanatory diagram (B). 2 is a main part longitudinal sectional view (A) showing the state of the electric switching valve at the maximum flow rate according to the first embodiment, and a valve body position explanatory view (B) . FIG. They are a principal part longitudinal cross-sectional view (A) at the time of the minimum flow volume of the reverse direction of the electrically-driven switching valve which concerns on Example 1, and a valve body position explanatory drawing (B) .
The electric switching valve 40 includes a valve body 42 that adjusts the flow rate of refrigerant through the valve body 43 in the valve chamber 42c , a can 46 that incorporates a rotor 47 that rotates the valve body 43 integrally with the valve body 42 , and a can 46 And a stator 18 that rotationally drives the rotor 47 . The rotor 47 and the stator constitute a stepping motor.
[0012]
The valve body 42, which form a core of the present invention, is composed of a metal such as brass, as shown in FIG. 1, forms a valve chamber 42 c, the valve chamber 42 c in the disc-shaped portion The first communication hole 42a communicates, and the first flow path (fluid inlet / outlet pipe) 2a is connected to the first communication hole 42a . Further, the disc-shaped portion of the valve body 42 has a second communication hole 42 b communicating with the valve chamber, the second flow path 2b (fluid and out tube) is coupled to the second communication hole 42 b . The stepped portion of the upper outer peripheral shoulder of the valve body 40 is fixed by the lower end of the can 46 is butt welded.
[0013]
Further, as shown in FIG. 1, stoppers 42 e and 42 e are provided upright at two positions at a certain angle from the center point on the upper surface of the valve body 42 . The stoppers 42 e and 42 e regulate the rotation of the valve body 43 at a constant angle, for example, 180 degrees, and are assembled with the first flow path 2 a and the second flow path 2 b of the valve body 42 so as to be positioned. The stoppers 42 e and 42 e are fixed to the valve main body 42 by brazing. The valve chamber 42 c is its horizontal cross section is formed in a circular, upper face is opened, the lower surface is communicated with the first communication hole 42a and the second communicating hole 42 b, the valve body 43 is disposed therein.
[0014]
Valve body 43 is constructed with brass as a material, and the axial center 43g of the cylindrical body having a constant thickness, consists of a closing part 43f extending horizontally from the axial center, of this axial portion 43g A throttle hole 43a is formed as a valve body channel that is rotatable about the center line and communicates the refrigerant between the first channel 2a and the second channel 2b.
In the case of the first embodiment, the valve body flow path includes the throttle hole 43a . Its to the valve body 43 is rotated, as shown in FIG. 1, closure 43f extending to the outer periphery than the support shaft 43c is closed the first communication hole 4 2a, the throttle hole 43 a is opposed As shown in FIG. 3, the second communication hole 42b is closed and the throttle hole 43a is opposed, and as shown in FIG. 2, the closed portion 43f extending to the outer periphery is the first flow path 2a. And the second flow path 2b can be switched to either one of the states.
[0015]
B over data 47, the outer peripheral surface to be decorated in the can 46 to be described later is cylindrical and is rotatably supported by the valve holder 45. A spring 45 a is pressed between the upper bottom of the inner surface of the can 46 and the spring receiver on the upper surface of the valve element holder 45 . This configuration has been pressed on the valve body 43 side in the lower direction to the valve holder 45 and the rotor 47, if an excessive load is applied to the valve body 43, and the valve holder 45 and valve body 43 It is also possible to be disengaged, and the role of a safety device can be fulfilled.
[0016]
The can 46 has a bottomed cylindrical shape formed of a nonmagnetic metal such as stainless steel, and is fixed to a stepped portion on the upper portion of the valve main body 42 by welding or the like, and the inside thereof is kept airtight.
[0017]
The stator 18 constituting the stepping motor with the rotor 47 includes a yoke 19 composed of magnetic material, the upper and lower stator coil 19b wound around via a bobbin 19a in the yoke 19, is composed of a 19b, the can 46 A fitting hole 18a for external fitting is formed. The stator 18 is provided with a lead terminal 19c, and a cover 19e is formed to cover the connector 19d connected to the lead terminal 19c. A lead terminal 19c connected to the stator coils 19b and 19b protrudes from the stator 18, and a connector 19d to which a plurality of lead wires 19f are connected is connected to the lead terminal 19c. A cover 19e covering the connector 19d is welded to the stator 18, and the inside of the cover 19e is filled with a filler 19g such as an epoxy resin. The stator 18 has a fitting hole 18a having a lower opening at the center, and a can 46 is fitted into the fitting hole 18a, and is fixed to the valve main body 42 and the can 46 by a detent member 18b welded to the lower surface of the stator 18. Is done.
[0018]
In the first embodiment according to the present invention, the two flow paths constituting the refrigerant inlet / outlet pipes 2a and 2b are arranged vertically on the lower surface of the valve main body 42 in parallel with the rotational axis of the valve body 43, thereby providing the first flow path 2a. And the same refrigerant leakage generated by the pressure of the refrigerant received from the second flow path 2b,
The flow rate of the first flow channel → the second flow channel = the flow rate of the second flow channel → the first flow channel is realized.
[0019]
Example 1 is shown in FIGS. 1-3, FIG. 1 and 3, the rates of flow of the small capacity, FIG. 2 is flow shows the case of a large capacity, respectively. Specifically, FIG. 1 shows the position of the valve body during dehumidification of the cooling (or heating) cycle, FIG. 2 shows the position of the valve body during cooling and heating, and FIG. 3 shows the dehumidification of the heating and cooling (or chamber) cycle. The valve body position at the time is shown.
Example 1, as shown in FIG. 1, a first flow path 2a and the second flow path 2b are arranged in parallel on the left and right, to place the disk-shaped valve body 42 to the upper end of both flow paths, the Two holes, that is, a first communication hole 42a and a second communication hole 42b are formed in the valve body 42, and the flow path is mounted, and a synthetic resin that rotates 180 degrees on the upper surface of the valve body 42, etc. The valve body (oscillating body) which consists of is in the point provided. The valve body 43 has a lid shape, and a throttle hole 43a, that is, a flow hole having a relatively small cross section is formed in the lid portion.
[0020]
More specifically, the valve main body 42 is formed in a circular shape in plan view, and a concave portion 42f is formed in the center thereof, and the support shaft 43c of the valve body 43 is rotatably inserted. The outer peripheral portion of the valve body 43 and the support shaft 43 c are connected to the inner peripheral portion of the valve body holder 45 so that the rotational force is transmitted. The valve body holder 45 is integrated with the rotor 47 as in the other embodiments, and the rotation of the rotor 47 rotates the valve body 43 via the valve body holder 45. The valve body 43 includes a closing portion 43f and a shaft core portion 43g capable of closing the left and right first communication holes 42a and the second communication hole 42b, and a support shaft 43c is inserted through the shaft core portion 43g. , by the rotation of the support shaft 43c, closure 43f is positioned to close the first communication hole 42a shown in FIG. 1, a position not closing both the first communication hole 42a and the second communication hole 42b shown in FIG. 2, and, a position to close the second communication hole 42b shown in FIG. Further, in order to prevent the valve body 43 from moving to other than the above three positions, two stoppers 42e and 42e are erected in the vicinity of the communication holes 42a and 42b on the valve main body 42.
[0021]
In Example 1 , the valve body 43 has a structure that is pressed against the communication holes 42a and 42b by the refrigerant pressure regardless of which direction the refrigerant flows.
In addition to realizing the flow rate of the first flow channel → the second flow channel = the flow rate of the second flow channel → the first flow channel, the gap between the valve body 42 and the valve body 43 is reduced, and the leakage of the refrigerant is reduced. Can be. In the specific example, at the time of dehumidification during the cooling cycle of FIG. 1 (the refrigerant flows from the second flow path to the first flow path) and at the time of dehumidification during the heating cycle of FIG. 3 (the refrigerant is the first flow path). To the second flow path) can be set to substantially the same refrigerant flow state.
[0022]
【The invention's effect】
As can be understood from the above description, the electric switching valve of the present invention configured as described above has substantially the same leakage amount regardless of whether the flow of fluid such as refrigerant is in the forward or reverse direction. Accurate flow control can be realized in an air conditioner or the like that switches the path. Further, in addition to the above function, the fluid pressure presses the valve body against the valve body regardless of whether the fluid flow is in the forward or reverse direction, so that the fluid leaks from the valve chamber to the flow path.
[Brief description of the drawings]
[1] essential part longitudinal cross sectional view of a state in which remove the positive minimum flow when the stator of the electric switching valve according to the first embodiment of the present invention (A) and the valve element position diagram (B).
FIG. 2 is a longitudinal sectional view (A) of a main part at the time of a maximum flow rate and an explanatory view of a valve element position (B) of the electric switching valve according to the first embodiment.
FIG. 3 is a longitudinal sectional view (A) of a main part and a valve element position explanatory diagram (B) at the time of a minimum flow rate in the reverse direction of the electric switching valve according to the first embodiment.
FIG. 4 is a longitudinal sectional view of a motor-operated valve according to the prior art.
[Explanation of symbols]
1 ... Electric valve (conventional technology)
2 ... Valve body 2a ... Fluid inlet / outlet pipe [first flow path] 2b ... Fluid inlet / outlet pipe [second flow path]
2c ... Valve chamber 2d ... Guide bush fixing part 2e ... Can fixing part 2f ... Valve seat 3 ... Valve shaft 3a ... Valve body 3b ... Compression coil spring 4 ... Guide bush 4a ... Female thread 4b ... Lower stopper 5 ... Valve element holder 5a ... Male thread 5b ... Upper stopper 6 ... Can 7 ... Rotor 8 ... Stator 8a ..Stator coil 8b ... Yoke 8c ... Lead wire 8d ... Connector 8e ... Cover 18 ... Stator 40--Electric switching valve (Example 1 )
42 .... Valve body 42a..First communication hole 42b..Second communication hole 42c..Valve chamber 42e..Stopper 42f..Recess 43 .... Valve element 43a..Throttle hole 43c..Support shaft 43d ..Step part 43f..Closed part 43g..Shaft core part 45..Valve holder 45a..Spring 46.Can 47.Rotor 47a.Support link

Claims (1)

A valve body having a valve chamber in which the valve body is disposed, a pair of fluid inlet / outlet pipes provided in the valve body so as to communicate with the valve chamber, and the valve body rotating about the center of the valve chamber A rotor to be operated, a can fixed to the valve main body so as to incorporate the rotor, and a stator that is externally fitted to the can and rotationally drives the rotor,
The pair of fluid inlet / outlet pipes are disposed on the bottom surface of the valve body,
The valve body is an oscillating body that pivots and displaces on the inner bottom surface of the valve body in the valve chamber, and two positions that selectively cover one of the fluid inlet / outlet pipes by the rotational operation of the rotor. Swing and move to the position where both are opened,
An electric switching valve characterized in that the swinging body is provided with a throttle hole communicating with a flow path of an opposing fluid inlet / outlet pipe.

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