JP2003097754A - Motor operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor operated valve capable of effectively preventing ragged noises by reducing to the utmost fluid sounds generated upon a fluid passing through an orifice formed between a valve element and an outflow hole through an inflow hole and a valve chamber. SOLUTION: A valve body (20) has a valve element 30A for being axially vertically driven and a valve chamber 21 with an outflow hole 23 opened and closed by an inflow port 22 and the valve element 30A, and a porous member 60 for fractionalizing air bubbles in fluid is interposed in the valve chamber 21.

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 suitable for being used by being incorporated in a refrigerating cycle such as a heat pump type air conditioner, and more particularly to reducing noise during passage of a fluid (refrigerant). The present invention relates to a motorized valve.

[0002]

2. Description of the Related Art As an electrically operated valve of this type, there is an electrically operated valve as shown in FIG. The electric valve 1'of the illustrated example is used by being incorporated in a refrigeration cycle of a heat pump type air conditioner, for example, and includes a stepping motor 10, a valve body 20, and a valve shaft 30. 30 is moved up and down by screw feeding by the stepping motor 10, and the outlet port 23 formed in the valve body 20 is opened and closed by the valve body 30A of the valve shaft 30 to be formed between the valve body 30A and the outlet port 23. The flow rate is adjusted by changing the opening area of the orifice.

The stepping motor 10 includes a valve body 2
0, a can 11 having an upside-down bottomed cylindrical shape connected to a No. 0 via a bottom lid 18, and a stator yoke 13 fitted to the outer peripheral portion of the can 11.
A bobbin 14, a winding 15 wound around the bobbin 14 and energized from the outside, a stator yoke 13, a bobbin 1
Motor mold 12 for enclosing the outer circumference of the winding 4 and the winding 15.
And a rotor 39 which is disposed inside the can 11 and fixed to a valve shaft connecting body 40 described later, and which is made of a plastic magnet material to which magnetic metal powder is added and mixed, for example.

The valve body 20 has a valve chamber 21 which serves as a pressure reducing mechanism. An inlet 22 to which a conduit 64 is connected is provided on the left side of the valve chamber 21, and another conduit is provided on the bottom surface thereof. 6
5 is connected. Further, a valve seat 24 is formed on the valve body 20, and the valve seat 24 is formed with an outflow port 23 having a frustoconical seat surface that is opened and closed by a valve body 30A.

A valve body 30A provided at the lower end of the valve shaft 30 for opening and closing the outlet 23 is in pressure contact with the outlet 23.
It has an inverted frustoconical seating surface portion that sits down and closes the outlet 23. Further, above the valve chamber 21, a feed screw member 26 having an internal thread portion 27 formed on the inner peripheral portion is internally fitted and fixed.

A male screw portion 29 formed on the outer periphery of the lower portion of the valve shaft holder 28 is screwed into the female screw portion 27.
The valve shaft 30 is slidably inserted into the lower portion of the inner circumference of the valve shaft holder 28, and the collar 3 is attached to the lower portion of the valve shaft holder 28.
4 is press-fitted and fixed, and the valve shaft 30 includes a valve shaft holder 2
A coil spring 32, which is compressed inside 8, is always urged downward.

An elevating shaft 35 is fitted and fixed on the upper portion of the valve shaft holder 28 so as to be able to rotate integrally therewith, and a convex movable stopper 45 is provided on the outer periphery of the upper portion of the valve shaft holder 28. Is formed so that the valve shaft connecting body 40 made of synthetic resin and projecting downward can rotate integrally. Further, on the outer periphery of the upper portion of the feed screw member 26, a fixed receiving seat 50 made of synthetic resin is formed in which a convex fixed-side stopper 55 is provided so as to project upward. The movable stopper 45 is abutted against the fixed stopper 55.

In the motor-operated valve 1 ', when the motor 10 is rotated in one direction (normal rotation), the valve shaft connecting body 40, the valve shaft holder 28, etc. are integrally rotated, and the female screw portion 27 and the male screw portion 29 are rotated. The valve shaft 30 is lowered by the screw feeding action by screwing with the valve body 30A, and the valve body 30A is pressed against and seated on the outlet 23 formed in the valve seat 24, and the outlet 23 is closed.

At the time when the outlet 23 is closed, the movable stopper 45 is not yet in contact with the fixed stopper 55, and the valve shaft 30 keeps the outlet 28 closed and the valve shaft holder 2 is closed.
8 and the like are further rotated and lowered. Valve shaft 3 at this time
The descending amount of the valve shaft holder 28 with respect to 0 is absorbed by the compression of the coil spring 32.

After that, the valve shaft holder 28 and the like rotate further.
When lowered, the movable stopper 45 abuts against the fixed stopper 55, so that even if the rotor 39 continues to be energized / excited, the valve shaft connecting body 40 and the valve shaft holder 2
The rotation / lowering motion of 8 etc. is forcibly stopped. On the other hand, when the stepping motor 10 is rotated in the opposite direction,
The valve body 30A of the valve shaft 30 separates from the outlet 23, and the outlet 2
3 is opened.

[0011]

When the motor-operated valve 1'is incorporated in, for example, a refrigeration cycle of an air conditioner, a valve shaft 3 is provided.
0 is raised and the outlet 23 is opened to a predetermined opening,
Refrigerant is shown in FIG.
2 to flow into the valve chamber 21 and from the valve chamber 21 to the valve body 30.
When flowing out to the conduit 65 side through the orifice formed between A and the outlet 23, continuous flow noise is likely to be generated, and when the electric valve is adopted in the indoor unit of the air conditioner, There has been a problem that the flow noise becomes annoying noise and the comfort is hindered.

More specifically, the outlet (orifice) 23
If the fluid (refrigerant) flowing into the chamber is completely liquid, no flow noise is generated, but the fluid is in a mixed state of gas and liquid (gas-liquid two-phase flow), that is, the conduit 64, the inlet 22, and the valve chamber 21. When large bubbles K are mixed in the fluid flowing toward the outlet 23 through the flow noise, the flow noise becomes loud. This is because when the bubble K passes through the outflow port (orifice) 23, a sudden pressure fluctuation is generated on the inflow side and the outflow side, and the pressure fluctuation is propagated to the outside through the valve body 20, the conduits 64, 65 and the like. It is presumed that the flow noise increases as the bubble K increases.

Conventionally, in order to reduce the flow noise, after separating the gas and the liquid, only the liquid is allowed to flow into the orifice, or a mesh member or a mesh is provided in the conduit 64 upstream of the inflow port 22. It is known to dispose an impeller or the like to decompose the large bubbles K to subdivide them, but the former measure requires a large gas-liquid separator and valves and pipes for exhausting gas. There was a problem in terms of space, cost, etc. In the latter method, the bubbles K are subdivided into small bubbles immediately after passing through the mesh member, the impeller, etc.,
By the time they reach the orifice, they will again form large bubbles, and the effect of reducing the flow noise cannot be obtained so much.

The present invention has been made in view of the above problems, and an object thereof is an orifice in which a fluid is formed between a valve body and an outlet through an inlet and a valve chamber. The flow noise generated when passing through is reduced as much as possible,
An object of the present invention is to provide an electric valve capable of preventing noise.

[0015]

In order to achieve the above object, a motor-operated valve according to the present invention is a valve chamber having a valve body that can be raised and lowered in an axial direction, an inflow port, and an outflow port that is opened and closed by the valve body. And a valve body provided with a valve body, and a porous member for subdividing air bubbles in the fluid is interposed in the valve chamber.

The porous member is preferably arranged so as to partition the inlet side and the outlet side of the valve chamber and surrounds the valve body and the outlet, and is made of a porous plastic or foam metal tubular body. Composed of. Furthermore, it is preferable that the porous member is formed of a porous plastic or a foam metal that allows a fluid to flow from the outer peripheral side to the inner peripheral side in a part of the cylindrical body or the cylindrical part.

In the motor-operated valve of the present invention thus constructed, the porous member is interposed between the inflow port and the outflow port in the valve chamber, so that large bubbles in the fluid will flow from the inflow port to the valve. When it flows into the chamber and passes through the porous member, it is decomposed and fragmented. And in that subdivided state,
Since it rapidly flows into the orifice formed between the valve body and the outlet without growing into large bubbles, when passing through the outlet (orifice), sudden pressure fluctuations occur on the inlet and outlet sides. Without doing so, the effect of reducing flow noise is significantly improved, and noise can be effectively prevented.

Further, since it is only necessary to provide a noise preventing member having a simple structure composed of a plate-like body, a cylinder-like body, etc. in the valve chamber, compared with the case where a conventional gas-liquid separator is provided, space is reduced. It is also advantageous in terms of cost, and it is also possible to retrofit the existing electrically operated valve with a porous member without changing the configuration of the electrically operated valve. Further, the porous member, for example,
Clamping between the lower outer circumference of the feed screw member and the upper part of the valve body
Since it can be fixed or provided integrally with the feed screw member, there are advantages such as easy assembly.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of an electric valve according to the present invention. The motor-operated valve 1 of the illustrated embodiment is, for example, used by being incorporated in a refrigeration cycle of a heat pump type air conditioner, and like the conventional motor-operated valve 1 ′ shown in FIG. The valve body 20 and the valve shaft 30 are provided, and the valve shaft 30 is moved up and down by screw feeding by the stepping motor 10, and the valve body 30A of the valve shaft 30 opens and closes the outlet 23 formed in the valve body 20. The flow rate is adjusted by changing the opening area of the orifice formed between the valve body 30A and the outlet 23.

To explain this in detail, the stepping motor 10 includes a stator yoke 13 fitted to the outer peripheral portion of an upside-down bottomed cylindrical can 11, which is connected to a valve body 20 via a bottom cover 18. The bobbin 14, the winding 15 wound around the bobbin 14 and energized from the outside, and the stator yoke 1
3, the motor mold 12 enclosing the outer circumference of the bobbin 14 and the winding 15, and the motor 11 arranged inside the can 11 and fixed to the valve shaft connecting body 40 described later. For example, magnetic metal powder was added and mixed. And a rotor 39 made of a plastic magnet material.

The motor mold 12, the stator yoke 13, the bobbin 14, and the winding 15 are integrally fitted to the outer periphery of the can 11, and they are mounted on the motor mold 12.
By fitting the spherical crown-shaped locking convex portion 17a of the pressing locking member 17 attached to the screw 16 on the outer periphery of the can 11, for example, in any of the concave portions 19 provided at four positions at 90 degree intervals. It is designed for positioning and retaining.

The valve body 20 includes a valve chamber 21 which serves as a pressure reducing mechanism.
The fluid inlet / outlet 22 to which the conduit 64 is connected is provided on the left side of the valve chamber 21, and the conduit 65 is connected to the bottom surface thereof. Further, the valve body 20 is provided with a valve seat 24, and the valve seat 24 is opened and closed by a valve body 30A having an inverted frustoconical seating surface portion 30a provided on the lower end portion of the valve shaft 30 so as to project in the radial direction. An outlet 23 is formed.

As shown in FIG. 2, the outflow port 23 has a valve body 3
It is composed of a short inverted truncated cone-shaped conical seat surface portion 23a into which the seating surface portion 30a of 0A fits, and a relatively long truncated cone-shaped conical surface portion 23b into which the seat surface portion 30a extends downward. Above the valve chamber 21 of the valve main body 20, a feed screw member 26 having an internal thread portion 27 formed on the inner peripheral portion is internally fitted and fixed.

A male screw portion 29 formed on the outer circumference of the valve shaft holder 28 is screwed into the female screw portion 27 of the feed screw member 26, and the valve shaft 30 can slide on the lower inner circumference of the valve shaft holder 28. Further, a collar 34 is press-fitted and fixed to the lower portion of the valve shaft holder 28, and the valve shaft 30 is constantly urged downward by a coil spring 32 that is compressed inside the valve shaft holder 28. ing.

On the upper portion of the valve shaft holder 28, an elevating shaft 35, whose upper portion is inserted into a concave member 48 provided on the inside of the upper surface of the can 11, is configured so that it can rotate integrally with the valve shaft holder 28. It is fitted and fixed, and the valve shaft holder 28
On the outer circumference of the upper part of the above, a valve stopper 40, which is made of synthetic resin and has a convex movable stopper 45 protruding downward, is formed so as to be integrally rotatable.

A coil spring 36 is mounted on the upper part of the elevating shaft 35. The coil spring 36 rotates the rotor 39 (reverse rotation), and
5 and the valve shaft connecting body 40 are raised by the screw feeding action by the screwing of the female screw portion 27 and the male screw portion 29, and when the screw portions 27, 29 are unscrewed, the valve shaft holder 28 is screwed. This is for pressing the member 26 side to facilitate re-screwing. Further, on the outer periphery of the upper portion of the feed screw member 26,
A fixed receiving seat 50 made of synthetic resin is formed in which a convex fixed stopper 55 to which the movable stopper 45 is abutted is provided to project upward.

In addition to the above structure, in the present embodiment, a stepped tube formed of a porous member, for example, porous plastic or foam metal, between the inflow port 22 and the outflow port 23 in the valve chamber 21. A porous member 60 made of a sheet is provided so as to surround the valve body 30A and the outflow port 23. As shown in FIG. 3, the porous member 60 includes an upper large-diameter cylindrical portion 60a, an inverted truncated cone-shaped portion 60b, and a lower cylindrical portion 6a.
0c, and the upper large-diameter cylindrical portion 60a is, for example, pinched and fixed between the lower outer periphery of the feed screw member 26 and the upper portion of the valve body 20, and the lower end surface of the lower cylindrical portion 60c is the valve seat 24. It is attached to the upper surface.

The porous member 60 is arranged so as to partition the inlet 22 side (outer peripheral side) and the outlet 23 side (inner peripheral side) of the valve chamber 21, and the fluid is passed through the porous member 60. Since the air flows from the outer peripheral side to the inner peripheral side, the bubbles in the fluid can be made fine and the bubbles in the fluid can be made to flow finely.

In the motor-operated valve 1 of this embodiment, when the motor 10 is rotated in one direction (normal rotation), the valve shaft connecting body 4 is rotated.
0, the valve shaft holder 28, etc. rotate integrally, and the female screw portion 27
And the male screw portion 29 are screwed together to feed the valve shaft 30.
Is lowered, the valve body 30A is pressed against and seats on the outlet 23 formed in the valve seat 24, and the outlet 23 is closed.

At the time when the outlet 23 is closed, the movable stopper 45 is not yet in contact with the fixed stopper 55, the valve shaft 30 keeps the outlet 23 closed, and the valve shaft holder 28 and the like are further closed. It is rotated down. The descending amount of the valve shaft holder 28 with respect to the valve shaft 30 at this time is absorbed by the compression of the coil spring 32.

After that, when the valve shaft holder 28 and the like are further lowered in rotation, the movable stopper 45 abuts on the fixed stopper 55, so that even if the rotor 39 is continuously energized and excited, Connection body 40, valve shaft holder 2
The rotating descending motion of 8 etc. is forcibly stopped. On the other hand, when the stepping motor 10 is rotated in the opposite direction,
As shown in FIG. 2, the valve body 30A of the valve shaft 30 is connected to the outlet 23.
Away, the outlet 23 is opened.

In the motor-operated valve 1 of the present embodiment, between the inlet 22 and the outlet 23 in the valve chamber 21, a porous member, for example, a porous cylindrical body made of porous plastic or foam metal is used. Since the quality member 60 is interposed, the large bubbles K in the fluid flow from the inflow port 22 to the valve chamber 21.
A cylindrical member 60 which is made of a porous member and flows into the
When passing through, it is decomposed and subdivided. In the subdivided state, it quickly flows into the orifice formed between the valve body 30A and the outlet 23 without growing into a large bubble, and therefore, when passing through the outlet 23, the inflow side and the outflow side. There is no sudden pressure fluctuation on the side. Therefore,
Compared with the conventional motor-operated valve, the effect of reducing flow noise is improved, and noise can be effectively prevented.

Further, since it suffices to provide the valve chamber 21 with a member having a simple structure such as a cylindrical body (a plate body or the like is also possible), as compared with the case where a conventional gas-liquid separator or the like is provided. Therefore, it is advantageous in terms of space and cost, and it is also possible to retrofit the existing electric valve with the porous member 60. Further, since the porous member 60 is clamped and fixed between the outer periphery of the lower portion of the feed screw member 26 and the upper portion of the valve body 20, there is an advantage that the assembly is easy.

FIG. 4 shows another example of the above-mentioned porous member. The porous member 70 of this example is made of metal, for example, stainless, and is similar to the porous member 60 made of the cylindrical body. , An upper large diameter cylindrical portion 70a, an inverted frustoconical portion 70b,
And a lower cylindrical portion 70c. Then, in this lower cylindrical portion 70c, air bubbles in the fluid are subdivided at equal angular intervals (120 degrees) at, for example, three locations on the same circumference, for example, a foam metal formed body or a porous plastic molded body. 71 is provided. Such a porous member 70
Even if is used, the same operational effect as that of the above-described embodiment can be obtained.

In the above embodiment, the case where the motor-operated valve 1 is incorporated in the refrigerating cycle of the air conditioner has been described, but the motor-operated valve of the present invention is not limited to the refrigerating cycle but is a system for handling other gas-liquid mixed fluids. Similarly, when used for, the effect of preventing noise can be obtained. Further, in the above-described embodiment, the valve shaft is moved up and down by the screw feeding action by the motor, but the invention is not limited to this, and the valve shaft is moved in the axial direction to open and close the outflow port. The same effect can be obtained if it is done. Further, the porous members 60 and 70 are not limited to those of the above-described embodiment, and it goes without saying that they may be configured as a plate-shaped body (partition plate) or a hemispherical body.

[0036]

As can be understood from the above description, the motor-operated valve of the present invention is provided with a valve chamber between an inlet and an outlet.
Since a porous member, for example, a member made of a foam metal formed body or a porous plastic molded body is interposed, large air bubbles in the fluid are fragmented when passing through the porous member, and In this state, the bubbles rapidly flow into the orifice formed between the valve body and the outlet without growing into large bubbles. When passing through the outflow port (orifice), abrupt pressure fluctuations do not occur on the inflow side and the outflow side. Therefore, the effect of reducing flow noise is improved and noise is reduced compared to the conventional motor-operated valve. It can be effectively prevented.

Further, since it suffices to provide a member having a simple structure composed of a plate-like body, a cylindrical body, etc. in the valve chamber, space and cost are also reduced as compared with the case where a conventional gas-liquid separator is provided. It is also possible to retrofit the existing motor-operated valve with a member, and the porous member is used, for example, between the lower outer circumference of the feed screw member and the upper part of the valve body. -Because it can be fixed, there are advantages such as easy assembly.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a motor-operated valve according to the present invention.

FIG. 2 is a partially cutaway enlarged view showing a main part of the motor-operated valve shown in FIG.

3 is a perspective view showing a noise prevention member provided in the motor-operated valve shown in FIG. 1. FIG.

FIG. 4 is a perspective view showing another example of a noise prevention member used in the motor-operated valve of the present invention.

FIG. 5 is a partially cutaway side view showing an example of a conventional electric valve.

[Explanation of symbols]

1 Motorized valve 10 Stepping motor 20 valve body 21 valve chamber 22 Inlet 23 Outlet 24 valve seat 26 Feed screw member 30 valve shaft 30A valve body 60 porous member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akira Matsuo             Setagaya-ku, Tokyo Todoroki 7-1724 shares             Ceremony company Fuji Kouki F term (reference) 3H062 AA02 BB33 CC01 HH04 HH08                 3H066 BA32 EA18

Claims (3)

[Claims] 1. A motor-operated valve comprising: a valve body that can be moved up and down in an axial direction; and a valve body that has a valve chamber having an inflow port and an outflow port that is opened and closed by the valve body. ,
A motor-operated valve, characterized in that a porous member for subdividing air bubbles in a fluid is interposed. 2. The electric valve according to claim 1, wherein the porous member is arranged so as to partition the inlet side and the outlet side of the valve chamber. 3. The motor-operated valve according to claim 1, wherein the porous member is made of a cylindrical body made of porous plastic or foam metal surrounding the valve body and the outlet.