JP2003120840A - Electric valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unify the flow rate of a refrigerant flowing in an electric valve regardless of the forward and backward flowing direction. SOLUTION: In this electric valve 10 comprising a valve body 12 for adjusting a flow rate of the fluid by a valve element in a valve chest, a can 16 fixed to the valve body 12 and incorporating a rotor 17 for operating the valve element 13, and a stator 18 externally fitted to the can 16 for rotating and driving a rotor 17, the valve element 13 is rotatable, and makes a flow rate of the fluid approximately constant regardless of the forward and backward flowing direction of the fluid. The valve element 13 has an cylindrical outer face, and is rotated on a central line of the cylinder and provided with an orifice 13a and a cut part 13b to allow the refrigerant to be communicated between channels 2a, 2b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-operated valve that is used by being incorporated in an air conditioner or the like, and in particular, a fluid flowing through the motor-operated valve has the same flow rate regardless of whether the flow direction is normal or reverse. A motorized valve that can

[0002]

2. Description of the Related Art Conventionally, a motor-operated valve incorporated and used in an air conditioner, a refrigerator, etc. of this type is a device for adjusting the flow rate of a fluid such as a refrigerant, and usually has a valve chamber and a valve seat. And a bottomed cylindrical can fixed to the upper part of the valve main body through a collar-shaped portion, the rotor has a built-in inside of the can, and the center has an outside of the can. A stator having an insertion hole is externally fitted to the portion. Figure 15 shows
1 is a vertical sectional view of a conventional motor-operated valve 1 as described above, in which a valve body 2 has a valve chamber 2c and a guide bush fixing portion 2d.
And a can fixing portion 2e, and the valve chamber 2c is provided with fluid inlet / outlet pipes 2a and 2b for letting in and out a fluid such as a refrigerant. Inside thereof, a valve body 3a formed at the tip of the valve shaft 3 is provided.
A valve seat 2f for contacting and separating the needle valve is disposed.

The guide bush fixing portion 2d is located above the valve chamber and fixes the valve body 2 and the guide bush 4 together. A female screw portion 4a is formed on the inner circumference of the guide bush 4, and a male screw portion 5a formed on the outer circumference of the valve body holder 5 is screwed onto the female screw portion 4a. Is configured. A valve shaft 3 forming a valve body 3a at its lower end is slidably fitted in the valve body holder 5, and the valve shaft 3 is compressed in the valve body holder 5. The compression coil spring 3b always urges downward.

The can fixing portion 2e is located at the upper end of the valve body 2 and is made of a ring-shaped metal plate whose inner peripheral surface is caulked and fixed and whose lower end surface is joined by welding. The can 6 is fixed to the valve body 2 by being welded to the brim-shaped portion. The connection between the valve shaft 3 and the rotor 7 is performed by externally fitting the valve body holder 5 and the male screw portion 5a on the valve shaft 3 and internally fitting the valve holder 5 and the male screw portion 5a on the rotor 7 with a permanent magnet. A push nut 3c is press-fitted and fixed to the upper end of the valve shaft 3, and a flange portion thereof 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.

A rotor 7 is built in the can 6,
A stator 8 is fitted on the outside of the can 6. A stator coil 8a and a yoke 8b are vertically housed inside the stator 8, and the stator coil 8a includes a lead wire 8c and a connector 8 provided on the outer circumference of the stator 8.
It is energized through d. The yoke 8b is excited by the energization of the stator coil 8a to rotate the rotor 7, and the screw feed mechanism slides the valve body holder 5 and the valve shaft 3 to open and close to adjust the flow rate of the refrigerant. .
A cover 8e of the connector is welded to the stator 8.

[0006]

By the way, in the above-mentioned prior art, due to the forward and reverse flow directions of the refrigerant, a difference occurs in the refrigerant pressure with respect to the valve element 3a, and as a result, the direction of the flow of the refrigerant. Therefore, there is a problem that the flow rate becomes different. That is, in FIG. 15, the refrigerant is the fluid inlet / outlet pipe 2
When flowing from a to the fluid inlet / outlet pipe 2b, the refrigerant pressure acts on the valve body 3a in the downward direction, so that it is always in the downward position due to the backlash of the screw feed mechanism. Is small. On the other hand, the fluid inlet / outlet pipe 2
When flowing from b to the fluid inlet / outlet pipe 2a, the refrigerant pressure acts on the valve body 3a in the upward direction, and therefore the screw feed mechanism is always in the upward position due to the backlash. However, there is a problem in that the flow rate increases and the flow rate increases accordingly.

The present invention has been made in view of such a problem, and its object is to ensure that the fluid such as the refrigerant flowing through the motor-operated valve has the same flow rate regardless of the forward and reverse flow directions. It is to provide a motorized valve that can Further, the present invention relates to an electrically operated valve capable of reducing noise when a fluid (refrigerant) passes through the electrically operated valve.

[0008]

In order to achieve the above object, the motor-operated valve according to the present invention comprises the following means.
The motor-operated valve according to claim 1, wherein a valve body that adjusts a flow rate of a fluid by a valve body inside the valve chamber, a can that is fixed to the valve body and has a rotor that operates the valve body, and the can are externally fitted to the can. In the motor-operated valve including a stator that rotationally drives the rotor, the valve body is configured to be rotatable, and the flow rate is substantially the same regardless of whether the fluid flow direction is forward or reverse. And

A motor-operated valve according to a second aspect of the present invention is an electric valve including a valve main body, a can fixed to the valve main body, and a rotor fitted to the can, wherein a valve chamber of the valve main body is provided. A valve body that rotates in conjunction with the rotor is provided so that the size of the gap between the valve body and the valve body formed by the pressure of the fluid is substantially the same regardless of whether the fluid flow direction is normal or reverse. It is characterized in that it is configured.

According to a third aspect of the present invention, there is provided the electric valve according to any one of the first to third aspects, wherein the valve element has an outer cylindrical shape and rotates about a center line of the cylinder, and a fluid is applied to the valve element between the flow passages. It is characterized in that a valve body flow path is formed to communicate with.
According to a fourth aspect of the invention, in the electrically operated valve according to the third aspect, a plurality of valve body flow passages are provided, and the valve body flow passages are formed so that the cross-sectional areas thereof are different from each other. Claim 5
The motor-operated valve described is the motor-operated valve according to any one of claims 1 to 4, wherein the valve body is formed such that a first flow path and a second flow path connected to the valve body are arranged at a right angle. It is characterized by

A motor-operated valve according to a sixth aspect is the third or fourth aspect.
In the electrically operated valve described above, the valve main body is characterized in that the first flow path and the second flow path connected to the valve main body are formed so as to be arranged in parallel on the side of the cylindrical portion. The motor-operated valve according to claim 7 is the motor-operated valve according to claim 3 or 4, wherein in the valve body, a first flow path and a second flow path connected to the valve body are arranged in a substantially linear shape, and The valve body flow path is formed so as to penetrate the valve body. The motor-operated valve according to claim 8 is
The motor-operated valve according to claim 3 or 4, wherein the valve body has a first flow path and a second flow path connected to the valve body arranged substantially parallel to a side portion of an axial extension portion of the cylindrical portion. It is characterized in that it is formed.

According to a ninth aspect of the present invention, in the electric valve according to the eighth aspect, the valve body is made of a disc-shaped member, and the first communication hole and the second communication hole are formed around the center of the disc-shaped member. While being drilled, it rotates to the can side of the disk-shaped member and rotates
A position for selectively closing the communication hole and the second communication hole, and
The valve body is movably arranged at a position where neither the first communication hole nor the second communication hole is closed, and the first communication hole is provided in each communication hole on the side opposite to the side where the valve body of the disk-shaped member is arranged. It is characterized in that the flow path and the second flow path are mounted. The motor-operated valve according to claim 10 is the motor-operated valve according to claim 9, wherein the first flow path and the second flow path are positions on the side of the axial extension of the cylindrical portion and at a constant angle about the axis. It is arranged in. The motor-operated valve according to claim 11 is the motor-operated valve according to any one of claims 9 and 10, wherein the valve body is provided with an orifice forming portion in which an orifice is bored, and at least on the fluid inflow side of the orifice forming portion. A porous member is arranged. The electric valve according to claim 12 is the electric valve according to claim 11, wherein the first porous member and the second porous member are provided on both sides of the orifice forming portion as the porous member.
A porous member is arranged. A motor-operated valve according to a thirteenth aspect is the motor-operated valve according to the eleventh or the twelfth aspect, characterized in that a rotor made of a plastic magnet, a rotary shaft, and a drive portion are integrally formed as a drive portion of the valve body. . The motor-operated valve according to claim 14 is the one according to claim 1.
In the electrically operated valve according to any one of 1 to 13, the valve body is characterized in that the porous member and the orifice forming portion are integrated and the seat portion is formed. According to a fifteenth aspect of the invention, in the electrically operated valve according to the fourteenth aspect, the valve body is rotated by a valve body driving body integrated with the valve body. The motor-operated valve according to claim 16 is the valve according to claim 10.
14. The motorized valve according to any one of 14 above, wherein the valve body is separated into two pieces, the upper member is provided with a stopper of the valve body and the valve seat, and the lower valve body base is provided with a joint portion of a fluid inlet / outlet pipe. It is characterized by being formed and integrated.

The motor-operated valve thus constructed is
Since the leak amount is substantially the same regardless of whether the flow of the fluid such as the refrigerant is normal or reverse, accurate flow rate control can be realized in an air conditioner or the like that switches the flow path of the refrigerant. 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. It will be scarce. In addition, noise due to the flow of the fluid is reduced from the electrically operated valve.

[0014]

DETAILED DESCRIPTION OF THE INVENTION

[Embodiment 1] Hereinafter, an embodiment of a motor-operated valve 10 according to Embodiment 1 will be described in detail with reference to the drawings. FIG. 1 is a vertical cross-sectional view (A) showing a state of a motor-operated valve according to a first embodiment of the present invention at a minimum flow rate, and a bb cross-sectional view (B) of the same FIG.
FIG. 2 is a vertical sectional view (A) showing a state of the motor-operated valve according to the first embodiment at a maximum flow rate, and a bb sectional view (B) of the same FIG. The motor-operated valve 10 includes a valve body 13 in a valve chamber 12a.
The valve body 12 that adjusts the flow rate of the refrigerant by the above, the can 16 that incorporates the rotor 17 that rotates the valve body 13 integrally with the valve body 12, and the stator 18 that is externally fitted to the can 16 and that drives the rotor 17 to rotate. I have it. The rotor 17 and the stator 18 form a stepping motor.

The valve body 12 is the core of the present invention, is made of a metal such as brass, has a certain length in the vertical direction, as shown in FIG. 1, and has a tubular shape. The interior forms a valve chamber 12c, and a side portion thereof has a first communication hole 12a communicating with the valve chamber 12c, and the first flow path 2a is connected to the first communication hole 12a. Further, a second communication hole 12b communicating with the valve chamber is provided in the lower portion of the valve chamber, and the second flow path 2b is connected to the second communication hole 12b. Valve body 1
The ring-shaped collar-shaped plate 12
d is fixed. Then, the lower end of the can 16 described later is butt-welded and fixed to the collar-shaped plate 12d to be fixed.

Further, as shown in FIG. 1, stoppers 12e, 12e are erected at two positions separated by a constant angle, for example 180 degrees, from the center point on the upper surface of the collar plate 12d. The stoppers 12e and 12e regulate the rotation of the valve body 13 at a constant angle, for example, 180 degrees, and prevent the valve body 13 from rotating in the first direction.
The flow path 2a and the second flow path 2b are positionably assembled. Further, the stoppers 12e and 12e are brazed and fixed at the same time as the collar plate 12d. The valve chamber 12c is formed in a substantially cylindrical shape having a circular horizontal cross section, an upper surface is open, a lower surface communicates with the second communication portion 12b, and the valve body 13 is arranged inside.

The valve body 13 is made of brass and is a cylindrical body having a certain thickness.
An outer surface cylindrical shape inscribed in 2c is rotatable about a center line of the cylinder, and a valve body flow path 13 is formed for communicating the refrigerant between the first flow path 2a and the second flow path 2b. There is. In the case of the first embodiment, the valve body flow path 13 has the cutout portion 13b.
And the orifice 13a. As shown in FIGS. 1 and 2, the cutout portion 13b is formed in a state in which a substantially semicircular portion is cut off over a certain height below the valve body 13, and the valve body 1 is further cut.
An orifice 13a is bored at an intermediate position of the constant height above the remaining portion of the lower part of the nozzle 3. Then, the valve body 13 rotates, and as shown in FIG. 1, the remaining portion closes the first flow path 2a and the orifice 13a faces each other, and FIG.
As shown in, the cutout portion 13b can be switched to any one of the states in which the first flow passage 2a and the second flow passage 2b communicate with each other.

Therefore, the valve body 13 is rotationally driven in the range of 180 degrees. The upper portion of the valve body 13 is a cylindrical valve body key portion 13
c is formed, and the valve body key portion 13c is rotatably linked to a valve body holder 15 described later. Therefore, the outer peripheral portion of the lower portion of the valve body key portion 13c is formed in an uneven shape so as to be engaged with the lower portion of the valve body holder 15.
Further, a step portion 13d is formed at an intermediate position in the up-down direction of the valve body 13, and is formed so as to contact the upper surface of the valve body 13,
Further, the stoppers 12e, 12 are provided on a part of the step portion 13d.
A protrusion 13e that can abut the e is formed.

The valve body key portion 13c is fitted in the cylindrical valve body holder 15 on the upper portion thereof. The valve body holder 15 is driven by the rotor 17. A spring bearing portion is formed on the upper surface of the valve body holder 15. In addition, the valve body holder 15
The rotor 17 and the rotor 17 are coupled to each other via a support ring 17a, and the support ring 17 is formed of a brass metal ring inserted when the rotor 17 is molded. Also,
The upper protrusion of the valve body holder 15 is fitted in the inner peripheral hole of the support ring 17, and the outer periphery of the upper protrusion is caulked and fixed to the rotor 1.
7, the support ring 17a and the valve body holder 15 are connected. The valve body 12, the valve body holder 15, and the support ring 17a are all made of brass.

The rotor 17 has a cylindrical outer peripheral surface so as to be installed in a can 16 described later, and is axially supported by the valve body holder 15. Further, a spring 15a is mounted between the upper bottom portion of the inner surface of the can 16 and the spring receiver on the upper surface of the valve body holder 15. With this configuration, the valve body holder 15 and the rotor 17 are pressed toward the valve body 13 side in the downward direction.
When an excessive load is applied to 3, the valve body holder 15 and the valve body 13 can be disengaged, and the role of a safety device can be fulfilled.

The can 16 has a bottomed cylindrical shape made of non-magnetic metal such as stainless steel, and is fixed to the flange 12d made of stainless steel fixed to the upper portion of the valve body 12 by welding or the like. The inside is kept airtight.

The stator 18 is composed of a yoke 19 made of a magnetic material and upper and lower stator coils 19b and 19b wound around the yoke 19 via bobbins 19a. The hole 18a is formed. A lead terminal 19c is arranged on the stator 18, and a cover 19e is formed to cover a connector 19d connected to the lead terminal 19c. A lead terminal 19c connected to the stator coils 19b and 19b projects 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. And the cover 19 which covers the connector 19d
e is welded to the stator 18, and the inside of the cover 19e is filled with a filling material 19g such as an epoxy resin. Stator 1
Reference numeral 8 has a fitting hole 18a having an opening on the lower surface at the center, and a can 16 is fitted into the fitting hole 18a, and is fixed to the valve body 12 and the can 16 by a detent member 18b welded to the lower surface of the stator 18. It

In the first embodiment, when the refrigerant flows between the first and second flow paths 2a and 2b, the valve element 13 is made to have
If the position shown in FIG. 1 is set, a small volume of refrigerant can be made to flow, and if the valve body 13 is set to the position shown in FIG. 2, a large amount of refrigerant can be made to flow. In this case, in the first embodiment, the first
When the refrigerant flows from the flow passage 2a to the second flow passage 2b, the valve pressure 13 pushes the valve body 13 to the right, so that the amount of leakage from the gap is large, and conversely the second flow passage 2b to the first flow passage 2a. When the refrigerant flows to, the pressure is pushed to the left, and the amount of leakage from the gap is reduced. Therefore, since this leak amount is added to the flow rate flowing through the orifice 13a, the first → second flow rate = second → first flow rate is not completely obtained, but as in the conventional technique, Depending on the flow direction of the catalyst, the refrigerant pressure does not act on the valve body in the forward direction or the reverse direction in the opening / closing direction, so that the flow in both directions becomes relatively close. In addition, in the first embodiment, since the number of parts constituting the motor-operated valve 10 is small, there are few failures, and the pressure of the refrigerant against the valve body 13 is directly received by the valve main body 12, so that the structure is structurally improved. -There is no stress and it is possible to save material.

[0024]

Second Embodiment In the motor-operated valve 20 according to the second embodiment, the first flow passage 2a and the second flow passage 2b are arranged vertically in parallel to each other,
As a structure in which the pressure from the refrigerant received from a, 2b is always pressed in the right direction (FIG. 3), the first → second≈second
→ The first is realized. Example 2 is shown in FIGS. 3 and 4, FIG. 3 shows a small capacity state, and FIG. 4 shows a large capacity state.
Shown respectively.

The second embodiment is basically different from the first embodiment in that the second flow passage 2b is provided in parallel with the lower portion of the first flow passage 2a, and the first flow passage of the valve body 23. 2a and second flow path 2
The cutout portion 23b is formed in the valve body 23 corresponding to b, and the orifices 23a and 23b are provided above and below the remaining portion and at positions corresponding to the first flow passage 2a and the second flow passage 2b, respectively.
This is the point where 23a is provided. Further, the lower surface of the valve body 23 is closed.

That is, also in the case of the second embodiment, the valve body flow path is composed of the notch 23b and the orifices 23a, 23a.
As shown in FIGS. 3 and 4, the notch 23b is formed in a state in which a substantially semicircular portion is cut off over a constant height below the valve body 23, and further, the constant height above the remaining portion below the valve body 23. Orifices 23a, 23a are bored at two positions at the position. In addition, the lowermost end of the valve body 23 is formed so as to be guided by the valve body 22 by leaving a circular portion in plan view without a notch for smooth rotation and support of the valve body 23. . Further, the central portion of the circular portion in plan view has a ring shape with a hole formed in the central portion. This is so that the refrigerant pressure does not act below the valve body 23 and acts on the bottom of the valve chamber of the valve body 22 so as not to hinder the rotation of the valve body 23.

Then, the valve body 23 rotates, and as shown in FIG. 3, the remaining portion closes the first flow passage 2a and the first flow passage 2b, and the respective orifices 23a, 23a have the first and second openings.
It is possible to switch between a state in which the two flow paths 2a and 2b are opposed to each other, and a state in which the cutout portion 23b allows the first flow path 2a and the second flow path 2b to communicate with each other, as shown in FIG. Has become.

In the above structure, the valve body 23 is rotationally driven in the range of 180 degrees. A cylindrical valve body key portion 23c is formed on the upper portion of the valve body 23, and the valve body key portion 23c is rotatably linked to a rotor 27 described later. Therefore, the lower portion of the valve body key portion 23c. The outer peripheral portion is formed in a concavo-convex shape so as to be engaged with the lower portion of the valve body holder 25, and the step portion 23 is provided at an intermediate position in the vertical direction of the valve body 23.
d is formed so as to come into contact with the upper surface of the valve body 22, and the stopper 22 is formed in a part of the step portion 23d.
The protrusions 23e that can contact the e and 22e are the same as in the first embodiment.

In the second embodiment, in addition to the effect of the first embodiment, the valve body 23 has the first structure regardless of the flow direction of the refrigerant.
Since the structure is such that it is always pressed in the right direction by the pressure received from the flow passage 2a and the second flow passage 2b, compared with the first embodiment, it is even more irrespective of the forward and reverse flow directions of the refrigerant.
It is possible to realize the first → second flow rate≈second → first flow rate.

[0030]

[Third Embodiment] The motor-operated valve 30 of the third embodiment has the same basic problems as those of the first and second embodiments, but the position of the flow passage and the valve body structure are basically different. In the third embodiment, the first flow passage 2a and the second flow passage 2b attached to the valve body 32 are arranged in a straight line with the same pipe diameter, and are arranged on the opposite surface of the valve body 32 with the axis of rotation of the valve body 33 interposed therebetween. Be connected. On the other hand, the point that the valve body 33 is formed in a tubular shape as a whole and that the valve body 33 has the valve body passages 33a and 33b formed in the rotation shaft core thereof are different from the first and second embodiments. There is no.

In the third embodiment, the pressure of the refrigerant received from the first flow passage 2a and the second flow passage 2b pushes it to the downstream side, but since the shape is completely symmetrical, the first → The second flow rate ≈the second → the first flow rate is realized. The third embodiment will be specifically described with reference to FIGS. 5 shows a small capacity state, and FIG. 6 shows a large capacity state. The characteristics of the valve element 33 of the third embodiment are as follows.
Small orifice 33a having a small flow passage cross section as a valve passage
And a large orifice 33b having a large flow passage cross section is formed in a cross shape. Further, the lower surface of the valve body 32 is closed.

That is, in the case of the third embodiment, the valve body flow passage is 9
Two small and large orifices 33a, 33 intersecting at 0 degree
b. The lowermost end of the valve body 33 is the valve body 33.
In order to smoothly rotate and support the above, it is the same as the second embodiment in that it is formed so as to be guided to the valve main body by leaving a notched notched circular portion in plan view. And the valve body 33
However, as shown in FIG.
When it is in a position connecting a and 2b, the first flow path 2a, the second flow path 2a
When the refrigerant flows between the flow paths 2b, there is no difference in the flow rate regardless of the direction. In addition, the valve body 33
When rotated once, as shown in FIG. 6, the orifice 33b having a large cross section is located at a position connecting both flow paths 2a and 2b, and the refrigerant flows from the first flow path 2a to the second flow path 2b, the reverse is also true. However, there is no difference in the flow rate.

In the above structure, the valve element 33 is rotationally driven in the range of 90 degrees. A cylindrical valve body key portion 33c is formed on the upper portion of the valve body 33, and the valve body key portion 33c is
It is connected to a rotor 37, which will be described later, so that only rotation is possible, and for that reason, the outer peripheral portion of the lower portion of the valve body key portion 33c is formed in an uneven shape so as to engage with the lower portion of the rotor 37. , And a step portion 33d is formed at an intermediate position in the up-down direction of the valve body 33 so as to contact the upper surface of the valve body 32, and a part of the step portion 33d can contact the stopper 32e. The point that the different protrusions are formed is the same as in the first and second embodiments.

In addition to the effect of the first embodiment, the third embodiment has the same pressure received by the valve body 33 from the refrigerant in either direction of the flow of the refrigerant. In this case, the first flow rate → the second flow rate = the second flow rate → the first flow rate.

[0035]

[Fourth Embodiment] In the fourth embodiment, the refrigerant inlet / outlet pipes 2a, 2
The two flow passages that form b are arranged vertically in parallel with the rotation axis of the valve body 43 so that the refrigerant leaks generated by the pressures of the refrigerant received from the first flow passage 2a and the second flow passage 2b are the same. ,
The first → second flow rate = second → first flow rate is realized.

Example 4 is shown in FIGS.
Shows the case where the flow rate is small, and FIG. 8 shows the case where the flow rate is large. Specifically, FIG. 7 shows the valve body position during dehumidification in the cooling (or heating) cycle, and FIG.
The valve body position during heating, and FIG. 9 shows the valve body position during dehumidification in the heating / cooling (or cooling) cycle. Example 4 is Example 1
3 to 3 are basically different from each other as shown in FIG.
The flow passage 2a and the second flow passage 2b are arranged in parallel to the left and right, and the disc-shaped valve main body 42 is arranged at the upper ends of both the flow passages.
2 has two holes, that is, a first communication hole 42a and a second communication hole 42b are formed to attach the above-mentioned flow path, and the upper surface of the valve body 42 is made of a synthetic resin or the like that rotates by 180 degrees. The point is that the valve body is provided. The valve body 43 has a lid shape, and an orifice 43a, that is, a communication hole having a relatively small cross section is bored in the lid portion.

More specifically, the valve body 42 is formed in a circular shape in a plan view, a recess 42f is formed in the center thereof, and the support shaft 43c of the valve body 43 is rotatably inserted therein. The outer peripheral portion of the valve body 43 and the support shaft 43c are connected to the inner peripheral portion of the valve body holder 3245 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 causes the valve body 43 to rotate via the valve body holder 45. The valve body 43 includes the left and right first communication holes 42 a and second communication holes 42.
It consists of a closing part 43f capable of closing b and a shaft core part 43g, and the support shaft 43c is inserted through the shaft core part 43g. The rotation of the support shaft 43c causes the closing part 43f to move to the position shown in FIG. A position where the first communication hole 42a is closed, a position where neither the first communication hole 42a nor the second communication hole 42b shown in FIG. 8 is closed,
Also, the position is such that the second communication hole 42b shown in FIG. 9 is closed. Further, in order to prevent the valve body 43 from moving to positions other than the above three positions, two stoppers 42e and 42e are provided upright in the vicinity of the communication holes 42a and 42b in the upper part of the valve body 42.

Similar to the effects of the second and third embodiments, the fourth embodiment has a structure in which the valve body 43 is pressed against the communication holes 42a and 42b by the refrigerant pressure regardless of the flow direction of the refrigerant. Therefore, in addition to realizing the first → second flow rate = second → first flow rate, the gap between the valve body 42 and the valve body 43 is reduced, and the leakage of the refrigerant is minimized. You can In the specific example, during dehumidification during the cooling cycle of FIG. 7 (the refrigerant flows from the second flow path to the first flow path) and during dehumidification during the heating cycle of FIG. 9 (the refrigerant flows through the first flow path). From the second to the second flow path) and substantially the same refrigerant flow state.

Further, according to the present invention, in the motor-operated valve according to the fourth embodiment, when noise is generated when the refrigerant passes, the noise can be reduced. That is, the valve body 43 of the electric valve shown in FIG. 7 is made of a porous member. Example 5 in which a valve element is constituted by such a porous member is shown in FIGS. 10 and 11.

Fifth Embodiment A motor operated valve 100 according to a fifth embodiment of the present invention will be described in detail. FIG. 10 is a motor-operated valve 1 according to the fifth embodiment.
FIG. 11 is a vertical cross-sectional view showing a state at a minimum flow rate of 0, and FIG. 11 is a cross-sectional view taken along the line AA of FIG. The motor-operated valve 100 includes a valve body 900, a can 400 fixed to the valve body 900 by welding, and a rotor 30 installed in the can 400.
0, the valve body 200 that rotates in the valve chamber 110 by the rotor 300, and the cup-shaped rotor 3 that is externally fitted to the can 400.
And a stator 500 that rotationally drives 00. The rotor 300 and the stator 500 form a stepping motor.

The rotor 300 has a substantially cylindrical outer peripheral surface and is substantially cup-shaped as a whole made of a plastic magnet so as to be installed in a can 400 described later.
The rotating shaft 800 is inserted and fixed to the bottom portion 600 of 00. A drive unit 810 that drives the valve body 200 is integrally formed on the bottom portion 600.

As shown in FIG. 10, the valve body 200 is a plate-like member which is, for example, a cylindrical valve member 220 made of brass and an orifice forming portion 225 which is integrally provided on the valve member 220 and has an orifice 224 formed therein. Member and orifice 224
A porous member 226 provided on the upstream side into which the refrigerant flows
And a valve seat portion 228 integrally formed on the periphery of the valve member 220. In FIG. 10, the orifice 22
4 shows a case in which a porous member 223 is provided on the downstream side where the refrigerant flows out from No. 4, and these porous members are arranged at a predetermined distance from the orifice forming portion 225, and are provided on the valve member 220 by caulking, for example. Has been. These porous members 226 and 223 are formed by forming a foam metal having nickel, copper or the like as a main component into a disc shape or forming a foam resin into a disc shape. Further, a mesh-like wire mesh member formed by knitting a thread of metal such as stainless steel, shinchu, iron, aluminum or the like to form a disk shape, for example, a product name “Acuum mesh” manufactured by Toa Iron Net Co., Ltd. may be used.

The valve body 200 is rotated by a valve body driving body 210 made of, for example, a synthetic resin, and its valve seat portion 228 slides on a valve seat of a valve body 900 described later. Valve body driver 2
10 is formed in a rectangular shape in a plan view, and the valve element driving body 210 has a connecting member 212 integrally formed with the valve element driving element 210 engaged with a groove 220a on the circumferential surface of the valve member 220, 210 is configured integrally with the valve body 200. As shown in FIG. 11, the valve body 200 is formed in a circular shape in a plan view, the valve body driving body 210 is formed in a substantially rectangular shape in a plan view, and the two are integrated by the connecting member 212.

The valve body driver 210 is loosely fitted to the rotary shaft 800 at the center thereof. Two front and rear engaging members 211, 211 are erected on the valve body 210, and both engaging members 211 have a drive unit 810 integrally formed on the bottom of the rotor 300 as a hanging plate on the rotating shaft 800 side. It is arranged so as to sandwich it. Further, the valve body driver 210 includes the drive unit 81.
Zero is loosely fitted so that it can move up and down to some extent. The valve body driving body 810 has a side view rectangular shape as shown in FIG. Further, the lower surface of the driving unit 810 and the valve body driving body 210
A spring 820 is compressed between the upper surface and the upper surface.

The can 400 has a bottomed cylindrical portion 400a formed of a non-magnetic metal such as stainless steel, and a substantially skirt shape in which the first opening 400c is coaxially fixed to the opening of this portion by welding. Part 400b,
The opening 400d at that portion is fixed to the valve main body 900 by welding or the like to keep the inside airtight.

The stator 500 is composed of a yoke 510 made of a magnetic material and upper and lower stator coils 530 and 530 wound around the yoke 510 via a bobbin 520. A hole is formed. A lead terminal 540 is disposed on the stator 500, and a connector 550 connected to the lead terminal 540.
A cover 560 is formed to cover the. Stator 500
From this, a lead terminal 540 connected to the stator coils 530, 530 is projected, and a connector 550 to which a plurality of lead wires 570 are connected is connected to the lead terminal 540. And the cover 5 that covers the connector 550
60 is welded to the stator 500, and the inside of the cover 560 is filled with a filler 580 such as epoxy resin. The stator 500 has a fitting hole having an opening on the lower surface at the center, and the can 400 is fitted into this fitting hole.

The valve body 900 is made of metal such as stainless steel. The valve body 900 is composed of two upper and lower plate bodies. The valve body 900 is provided with a fixed portion of the skirt-shaped portion 400b of the can 400 on the peripheral edge of the lower valve body base 900a, and connects the fluid inlet / outlet pipes 2a and 2b. Two joint portions 950 are formed. Also, the upper member 90
In 0b, two first communication holes 910 and a second communication hole 920 are formed at a position having a constant angle with respect to the axis, and the upper surface constitutes a valve seat 940. The valve body 200 rotates on the valve seat 940 as the valve body driving body 210 rotates, and slides by the valve seat portion 228. In addition, in the central portion of the valve chamber 110 portion of the upper member 900b and the valve body base 900a, the recess 9 that supports the lower end of the rotating shaft 800 is formed.
00c is formed. Valve body 22 constructed as described above
0, the valve body driving body 210 is rotated by the rotating shaft 800, so that either the first communication hole 910 or the second communication hole 920 or both communication holes 910 and 920 have an action of being “open”. . (FIGS. 10 and 11 show the case where the first communication hole 910 is “closed” and the fluid flows from the fluid inlet / outlet pipe 2b to the fluid inlet / outlet pipe 2a.) That is, the valve body 22.
0 acts as a switching valve by opening or closing either the first communication hole 910 or the second communication hole 920.

The fifth embodiment has the above-mentioned structure,
In addition to the effect similar to the effect of 4, the valve body 20
An orifice forming portion 2 having an orifice 224 at 0
25, and at least the orifice forming portion 2
By disposing the porous member 226 for subdividing the bubbles of the refrigerant on the fluid inflow side of 25, it is possible to eliminate the large bubbles in the refrigerant and reduce the noise accompanying the flow of the refrigerant from the motor-operated valve. . Further, by disposing the porous members 226 and 223 on both sides of the orifice forming portion 225 as the porous member, the noise reduction effect can be further improved.
Specifically, the porous member 226 subdivides the large bubbles contained in the refrigerant, and when the refrigerant passes through the orifice 224, the large bubbles in the fluid flow into the valve chamber from the inflow port and the porous member 126. When passing through the through hole or mesh part of
It is decomposed and subdivided, and in the subdivided state, it rapidly flows into the orifice 224 formed in the valve body 200 without growing into a large bubble, and thus the orifice 224.
When passing through, no sudden pressure fluctuations occur on the inflow side and the outflow side, the effect of reducing flow noise is significantly improved, and noise during dehumidification operation can be effectively prevented.

Further, since it suffices to provide the first porous member 226 having a simple structure made of a plate-like member as a part of the valve body 200, as compared with the case where a conventional gas-liquid separator or the like is provided,
It is advantageous in terms of space and cost. Furthermore, the second
By adding the porous member 223, the orifice 224
It is possible to homogenize the gas-liquid two-phase flow flowing into the nozzle and to rectify the outlet torrent at the orifice 224. Further, as a drive unit of the valve body 200, a rotor 300 made of a plastic magnet is used.
Since the rotary shaft 800 and the drive unit 810 are integrally formed, the configuration can be further simplified. Also,
The valve body 200 includes a valve member 220 in which the porous members 223 and 226 and the orifice forming portion 225 are integrated and a seat portion 228 is further formed, and a valve body driving body 210, and the valve member 220 and the valve body driving body are formed. By integrating with 210,
Since the structure of the product can be simplified, the product can be downsized and the manufacturing cost can be further reduced. Further, since the valve body driving body 210 is provided with the engaging member 211 that is connected to the driving portion 810 of the valve body 200, the passive structure of the valve body 200 becomes extremely simple. In addition, the valve body 900
Is separated into upper and lower two pieces, and the valve member 2 is attached to the upper member 900b.
No. 00 stopper 930 and valve seat 940 are provided, and the valve body base 900a below is provided with the joint portion 950 of the fluid inlet / outlet pipes 2a and 2b, which are integrated with each other, thereby facilitating the processing of the valve body 900. be able to. Also, both members 900
The versatility of a and 900b is improved.

[0049]

[Sixth Embodiment] A motor-operated valve 50 according to a sixth embodiment includes a first flow path 2
It is characterized in that the a and the second flow path 2b are arranged at the side of the axis extending portion of the disk portion forming the valve body 52 and at a position having a constant angle about the axis (FIGS. 12 to 14). ).
In other words, in the fourth embodiment, the two communication holes 52a and 52b are arranged in point-symmetrical positions with respect to the center of the valve body 52, that is, 180 degrees apart from the center of the valve body 52. In the sixth embodiment, the first flow path 2a and the second flow path 2b are arranged in the two communication holes 52a and 52b, which are arranged 135 degrees apart from each other.
Is provided.

More specifically, as shown in FIGS. 12 to 14, the valve main body 52 is formed in a circular shape in plan view, a recess 52f is formed in the center thereof, and the support shaft 53c of the valve body 53 is formed therein. It is rotatably inserted. The valve body 53 is fitted in the valve body holder 55 and is connected so that the rotational force is transmitted. The valve body holder 55 is integrated with the rotor 57 as in the other embodiments, and the rotation of the rotor 57 causes the valve body 53 to rotate via the valve body holder 55. In addition,
The can 56 is supported and fixed to the valve body 52 via a can support frame 52d. The valve body 53 is the first 135 degrees apart.
The shaft core part 5 includes a closing part 53f capable of closing the communication hole 52a and the second communication hole 52b and a shaft core part 53g.
The support shaft 53c is inserted through 3g, and the closing portion 53f is rotated by the valve body holder 55 so that the first communicating hole 5 shown in FIG.
2a and the second communication hole 52b are not closed, FIG.
14 is a position for closing the second communication hole 52b shown in FIG.
The position is a position where the first communication hole 52a shown in is closed. Also,
In order to prevent the valve body 53 from moving to positions other than the above three positions, one stopper 52e is provided upright on the valve main body 52.

In the sixth embodiment, similar to the effects of the first to fifth embodiments, no matter which direction the flow of the refrigerant is, the valve body 53 is pressured by the refrigerant to cause the first communication hole 52a or the second communication hole 52b.
In addition to realizing the first-> second flow rate = second-> first flow rate, the gap between the valve body and the valve body becomes smaller and the refrigerant leaks. Can be very small. In particular,
In the state of FIG. 12, the sixth embodiment is fully opened in both directions.
In the state of No. 3, it is fully closed in the direction from the first flow path to the second flow path, as shown in FIG.
In the state of No. 4, it is fully closed in the direction from the second flow path to the first flow path.

As a specific example, during dehumidification during the cooling cycle of FIG. 13 (the refrigerant flows from the first flow path 2a to the second flow path 2b) and during the dehumidification during the heating cycle of FIG. 14 (the refrigerant is ,
It flows from the second flow path 2b to the first flow path 2a. ) And can have substantially the same refrigerant flow state. Furthermore, in the fifth embodiment, the first flow passage 2a and the second flow passage 2b can be provided close to each other, and the outer shape becomes compact and the valve chamber 52
Since the movement of the refrigerant in c is small and the resistance is small,
There is also an effect that the loss of the transfer energy of the refrigerant in the valve chamber 52c can be reduced.

In each of the above embodiments, the orifice is formed as the valve body flow passage in order to flow a small volume of flow. However, as in the fifth embodiment, if the orifice is not formed in the valve body, the flow rate is reduced. Is as close to zero as possible.

[0054]

As can be understood from the above description, in the motor-operated valve of the present invention thus constructed, the leak amount is substantially the same regardless of whether the flow of the fluid such as the refrigerant is the forward or reverse direction. Therefore, it is possible to realize accurate flow rate control in an air conditioner or the like that switches the flow paths. In addition to the above functions, the fluid pressure presses the valve body against the valve body regardless of whether the fluid flow is in the normal or reverse direction. It is very small. Further, by providing the valve body with the porous member, it is possible to reduce noise when the refrigerant passes.

[Brief description of drawings]

FIG. 1 is a vertical sectional view (A) showing a state of a motor-operated valve according to a first embodiment of the present invention at a minimum flow rate, and a bb sectional view (B) of the same FIG.

FIG. 2 is a vertical sectional view (A) showing a state of the motor-operated valve according to the first embodiment at a maximum flow rate, and a bb sectional view (B) of the same FIG.

FIG. 3 is a longitudinal sectional view (A) of a main part showing a state of a motor-operated valve according to a second embodiment of the present invention at a minimum flow rate, and bb of the same figure (A).
Sectional view (B).

FIG. 4 is a longitudinal sectional view (A) of a main part showing a state of the motor-operated valve according to the second embodiment at a maximum flow rate, and a bb sectional view (B) of the same FIG.

FIG. 5 is a longitudinal sectional view (A) of a main part showing a state of a motor-operated valve according to a third embodiment of the present invention at a minimum flow rate, and bb of the same figure (A).
Sectional view (B).

FIG. 6 is a longitudinal sectional view (A) of a main part showing a state of the motor-operated valve according to the third embodiment at the maximum flow rate, and a bb sectional view (B) of the same figure (A).

FIG. 7 is a longitudinal sectional view (A) of a main part and a valve body position explanatory view (B) of a motor-operated valve according to a fourth embodiment of the present invention at the time of a minimum positive flow rate.

FIG. 8 is a longitudinal sectional view (A) of a main part and a valve body position explanatory view (B) at the maximum flow rate of the motor-operated valve according to the fourth embodiment.

FIG. 9 is a longitudinal sectional view (A) of a main part and a valve body position explanatory view (B) of the motor-operated valve according to the fourth embodiment at the minimum flow rate in the reverse direction.

FIG. 10 is a vertical cross-sectional view showing the state of the motor-operated valve according to the fifth embodiment of the present invention at the minimum flow rate.

FIG. 11 is a sectional view taken along the line AA of FIG. 10 of the fifth embodiment.

FIG. 12 is a longitudinal sectional view (A) of a main part of a motor-operated valve according to a sixth embodiment of the present invention at a maximum flow rate and a valve body position explanatory view (B). In addition,
FIG. 6A is a cross section taken along the line D-D of FIG.

FIG. 13 is a longitudinal sectional view (A) of a main part and a valve body position explanatory view (B) of the motor-operated valve according to the sixth embodiment when the minimum flow rate in the reverse direction is present. Note that FIG. (A) is a DD cross section of FIG.

FIG. 14 is a longitudinal sectional view (A) of a main part and a valve body position explanatory view (B) of the motor-operated valve according to the sixth embodiment at the time of the minimum positive flow rate. Note that FIG. (A) is a DD cross section of FIG.

FIG. 15 is a vertical cross-sectional view of a motor-operated valve according to a conventional technique.

[Explanation of symbols]

1 ... Motorized valve (prior art) 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 fixed portion 2e ... Can fixed portion 2f ... Valve seat 3 ... Valve shaft 3a ... Valve body 3b ... Compression coil spring 4 ... Guide bush 4a ... Female screw portion 4b ... lower stopper 5 ... valve holder 5a ... male screw part 5b ... upper stopper 6 ... can 7 ... rotor 8 ... stator 8a ... stator coil 8b ... Yoke 8c ... Lead wire 8d ... Connector 8e ... Cover 10 ... Motorized valve (Example 1) 12 ... Valve body 12a ... First communication hole 12b ... Second communication hole 12c ... Valve Chamber 12d ··· Collar plate 12e · · Stopper 13 ··· Valve body 13a · · Valve body flow passage [Orifice 13b ... Valve passage [notch] 13c ... Valve key 13d ... Step 13e ... Protrusion 15 ... Valve holder 15a ... Spring 16 ... Can 17 ... Rotor 17a ... Support link 18, stator 18a, fitting hole 18b, rotation stop member 19, yoke 19a, bobbin 19b, stator coil 19c, lead terminal 19d, connector 19e, cover 19f, lead wire 19g ..Filler 20..Motorized valve (Example 2) 22..Valve body 22a..First communication hole 22b..Second communication hole 22c..Valve chamber 22d..Flange plate 22e..Stopper 23 .. ... Valve body 23a ... Valve body flow passage [orifice] 23b..Valve body flow passage [notch portion] 23c..Valve body key portion 23d..Step portion 23e..Projection portion 25..Valve body holder 25a ... Spring 26 ... Can 27 .. Rotor 27a .. Support link 30 .. Motorized valve (Example 3) 32 .. Valve body 32a .. First communication hole 32b .. Second communication hole 32c .. Valve chamber 32d .. Plate 32e ··· Stopper 33 ··· Valve body 33a ··· Valve body flow passage [small orifice] 33b ·· Valve body flow passage [large orifice] 33c ··· Valve body key portion 33d ··· Step portion 33e ··· Protrusion 35. Valve body holder 35a. Spring 36. Can 37. Rotor 37a. Support link 40. Motorized valve (Example 4) 42. Valve body 42a .. First communication hole 42b. 2 communication hole 42c ··· valve chamber 42e · · stopper 42f · · recessed portion 43 ··· valve body 43a · · valve body flow passage [orifice] 43c · support shaft 43d · · step portion 43f · · closing portion 43g ·・ Shaft core 45 ・ ・ Valve holder 45a ・ ・ Spring 46 Can 47. Rotor 47a. Support link 50. Motorized valve (Example 6) 52. Valve body 52a. First communication hole 52b. Second communication hole 52c .. Valve chamber 52d. Frame 52e ··· Stopper 52f ··· Recess 53 ··· Valve 53c ··· Supporting shaft 53d ··· Step 53e ··· Protrusion 53f ··· Closed 53g ·· Shaft core 55 ·· Valve holder 55a · -Spring 56-Can 57-Rotor 57a-Supporting link 100-Electric valve (Example 5) 110-Valve chamber 200-Valve 210-Valve driver
211 .. Engaging member 212 .. Connecting member 220 .. Valve member 22
1 ... Hole 223 ... [Second] Porous member 224 ... Orifice 225 ... Orifice forming part 226 ... [First]
Porous member 228 ··· Seat portion 300 · · Rotor 400 · · Can 500 · · Stator 5
00a ... Detent member 510 ... Yoke 520 ... Bobbin 5
30 .. Stator coil 540 .. Lead terminal 550 .. Connector 5
60 ... Cover 570 Lead wire 580 Filling material 6
00 ・ ・ Valve holder 800 ・ ・ Rotary shaft 810 ・ ・ Drive unit 8
20 ... Spring 900 ... Valve body 900a ... Valve body base 9
00b ... upper member 910 ... first communication hole 920 ... second communication hole 930 ... stopper 940 ... valve seat 9
50 ··· Joint part

Continued front page    (72) Inventor Tetsuya Aoki             Setagaya-ku, Tokyo Todoroki 7-1724 shares             Ceremony company Fuji Kouki F term (reference) 3H062 AA07 AA15 BB01 BB30 CC02                       EE07 HH04 HH08 HH09

Claims (16)

[Claims] 1. A valve body for adjusting a flow rate of a fluid passing through a valve body in a valve chamber, a can having a built-in rotor fixed to the valve body for activating the valve body, and the rotor fitted on the can and fitted to the rotor. An electrically operated valve provided with a rotatingly driven stator, wherein the valve body is rotatable and the flow rate thereof is substantially the same regardless of whether the flow direction of the fluid is normal or reverse. . 2. A motor-operated valve comprising a valve body, a can fixed to the valve body, and a rotor fitted to the can, wherein the valve body of the valve body rotates in conjunction with the rotor. A valve body is provided, and the size of the gap formed between the valve body and the valve body due to the pressure of the fluid is substantially the same regardless of whether the flow direction of the fluid is normal or reverse. Motorized valve to do. 3. The valve body has an outer cylindrical shape and is configured to rotate about a center line of the cylinder, and the valve body is formed with a valve body flow passage for allowing fluid to communicate between the two flow passages. The motor-operated valve according to claim 1 or 2. 4. The motor-operated valve according to claim 3, wherein the valve body is provided with a plurality of valve body passages, and the valve body passages are formed so as to have different cross-sectional areas. 5. The valve body according to claim 1, wherein the valve body is formed such that the first flow path and the second flow path connected to the valve body are arranged at right angles. Motorized valve. 6. The valve body is formed so that the first flow path and the second flow path connected to the valve body are arranged in parallel on the side of the cylindrical portion. 4. The motorized valve according to any one of 4 above. 7. The valve body is formed so that a first flow path and a second flow path connected to the valve main body are arranged in a substantially straight line, and the valve body flow path penetrates the valve body. The motor-operated valve according to claim 3 or 4, characterized in that. 8. The valve body is formed such that a first flow path and a second flow path connected to the valve body are arranged substantially parallel to a side portion of an axial extension of the cylindrical portion. The motorized valve according to claim 3 or 4. 9. The valve body is made of a disk-shaped member, and a first communication hole and a second communication hole are formed around the center of the disk-shaped member, and the valve body rotates toward the can side of the disk-shaped member. The valve body is movably arranged at a position where the first communication hole and the second communication hole are selectively closed, and a position where neither the first communication hole nor the second communication hole is closed. 9. The motor-operated valve according to claim 8, wherein the first flow passage and the second flow passage are mounted in the respective communication holes on the side opposite to the side where the valve body is arranged in the member. 10. The first communication hole and the second communication hole are arranged at positions on the side of the axial extension of the cylindrical portion and at a constant angle about the axis. Motorized valve. 11. The valve body is formed with an orifice forming portion having an orifice, and a porous member is arranged at least on the fluid inflow side of the orifice forming portion. Motorized valve of any of the above. 12. The electric flow control valve according to claim 11, wherein, as the porous member, the first porous member and the second porous member are arranged on both sides of the orifice forming portion. 13. The motor-operated valve according to claim 11, wherein a rotor formed of a plastic magnet, a rotary shaft, and a drive unit are integrally formed as a drive unit of the valve body. 14. The motor-operated valve according to claim 11, wherein the valve body is formed by integrating a porous member and an orifice forming portion and forming a seat portion. 15. The valve body is rotated by a valve body driver integrated with the valve body.
Motorized valve described. 16. A valve body is separated into two pieces, a valve body stopper and a valve seat are provided in an upper member, and a joint portion for a fluid inlet / outlet pipe is formed in a lower valve body base portion to be integrated. The motor-operated valve according to any one of claims 10 to 14, wherein the motor-operated valve is provided.