JP2000304147A - Motor-driven control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of an abnormal sound and noises during operation, to enhance the degree of freedom of control of a flow rate, and to prevent the occurrence of leakage of liquid. SOLUTION: This valve is formed such that a magnet and a rotor are disposed in a can provided on an outer periphery with a coil and a valve element assembly having a cylindrical valve chest is disposed on the lower end side of the can. The valve body assembly comprises an opening part punched in a calve seat orthogonal to the axial direction of the valve chest; and fluid inlet and outlet disposed with a valve seat nipped therebetween. The opening part is opened and closed according to the rotation angle of a valve element rotated by a rotor. In this case, the valve element is provided with a circular body part making closing slide contact with the inner wall of the valve chest, and a valve closing control part 21b formed in a protruding state in the body part and making closing slide contact. An area where an opening part 13a is covered with a valve closing control part is changed according to the rotation angle of the valve element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric control valve which is incorporated in a refrigeration / refrigeration / air-conditioning cycle such as a heat pump type air conditioner or a refrigerator, and is used for controlling a flow rate of a refrigerant or switching a flow path.

[0002]

2. Description of the Related Art Conventionally, in a refrigeration / refrigeration / air-conditioning cycle of a heat pump type air conditioner, a refrigerator or a refrigerator, an electric control valve is provided in a refrigerant flow passage for controlling a flow rate of a refrigerant and switching a flow passage. Has been used.

For example, in the separate type heat pump air conditioner shown in FIG. 6, the refrigerant heated to high pressure and high temperature by the compressor 100 is subjected to outdoor heat exchange as shown by a solid line in the drawing during cooling operation by a four-way switching valve 101. To the outdoor heat exchanger 102, which is used as a condenser, where the refrigerant liquefied at a low temperature is controlled by an external control device by an electric expansion valve (electric control valve) 103. While being expanded, and this is
Then, the refrigerant is vaporized and taken out of the room air to perform a cooling operation, and is returned to the compressor through the four-way switching valve 101 again.

During the heating operation, as shown by the broken line in the figure, the refrigerant which has become high pressure and high temperature in the compressor 100 is switched by the four-way switching valve 101 to the indoor heat exchanger 104 to be guided. The device 104 is used as a condenser. Here, a heating action is performed by applying heat to the indoor air, and the liquefied refrigerant having a lowered temperature is expanded while being controlled by an external control device by an electric expansion valve 103. This is the outdoor heat exchanger 1
The fuel is evaporated at 02 and returned to the compressor 100 again through the four-way switching valve 101.

[0005] In the heat pump type air conditioner which operates as described above, especially the electric expansion valve is frequently operated in order to appropriately control the temperature in the room. Since this type of conventional valve has a large operating noise, it is not preferable to install it indoors, and it has been installed on the outdoor unit side provided with an outdoor heat exchanger. Therefore, an expansion valve that controls the flow rate of the refrigerant for controlling the temperature in the room must be placed outside the room, away from the room, and the controllability such as responsiveness is poor. The low-temperature refrigerant must be piped from the outdoor unit to the indoor unit to the high-temperature outdoor, and despite this part being insulated, a large amount of heat escapes to the outside air. Was causing it.

[0006] In addition to the above-described air conditioners, for example, regarding refrigerators, the spread of large refrigerators in recent years has
Alternatively, due to the necessity of strict temperature control of the ice greenhouse and vegetable room, etc., an electric expansion valve that can perform expensive but precise control is used instead of the refrigerant flow control using a conventional inexpensive capillary tube etc. To do more.
Since such a refrigerator is installed and used indoors, an electric control valve such as an electric expansion valve is also installed in the room, and it is expected that operation noise from these electric control valves is reduced as much as possible. It is rare.

As a conventional example of the above-described electric control valve, as shown in FIG. 7, for example, an oblique notch 112a is provided around a cylindrical valve
There is a type in which the opening and closing between the fluid inlet / outlet 113 and 114 is performed by rotating 2. 111 is a valve shaft.

[0008] As another conventional example, FIG.
As shown in (B), a valve body 122 having a cam-shaped cross section is disposed in a valve chamber 121, and the valve body 122 is rotated to open and close the first and second fluid inlets and outlets 123 and 124. There are things. 131 is a pin, 132 is a can (case), 133 is a magnet, 134 is a rotor assembly, 1
Reference numeral 35 denotes a valve body assembly, and 136 denotes a lower lid stopper that forms a part of the valve body assembly 135.

[0009]

However, a control valve of the type shown in FIG. 7 has a large contact area on the outer peripheral surface of the valve element 112, cannot be fully closed structurally, and may cause valve leakage. . The rotary slide valve of the type shown in FIG. 8 has a vertical clearance at the contact position between the pin 131 and the can 132, an unusual noise due to play, and a vertical clearance at the contact position between the magnet 133 and the valve body assembly 135. , Rattling noise, magnet 13
3, the clearance in the rotational direction at the contact position between the valve body assembly 135 and the backlash, the clearance at the contact position between the magnet 133 and the can 132, the rubbing noise due to the backlash, the magnet 133 and the lower lid stopper 13
6, noise and noise due to backlash and rubbing between components, etc., flow control is simple, valve cannot be fully closed, valve leakage occurs, Only control like a proportional valve could be performed.

An object of the present invention is to provide an electric control valve which suppresses abnormal noise and noise during operation, increases the degree of freedom of flow control, completely closes the valve, and prevents liquid leakage. To provide.

[0011]

According to the present invention, a magnet and a rotor are provided in a can provided with a coil on an outer periphery thereof, and a cylindrical valve chamber is provided at a lower end of the can. The valve body assembly includes an opening formed in a valve seat orthogonal to the axial direction of the valve chamber, and a fluid inlet / outlet provided with the valve seat interposed therebetween. A motor-operated control valve that opens and closes the opening in accordance with a rotation angle of a valve body that is rotated by the rotor, wherein the valve body has a circular main body that sealingly contacts an inner wall of the valve chamber; A valve closing control portion protrudingly formed in the main body and sealingly slidingly contacting the valve seat.The valve closing control portion changes an area covering the opening in accordance with a rotation angle of the valve body. It is composed.

Further, there is provided an urging means for urging the valve body in a valve seat direction between the rotor and the valve body, and the valve closing control unit and the valve seat are provided inside the valve closing control unit. Characterized in that a concave portion for increasing the pressure reception is formed.

With this configuration, the opening degree of the opening (port) can be controlled with high sealing accuracy in accordance with the rotation angle of the valve body, and can be adjusted according to the outer shape of the valve closing control section (projection). Thus, complicated control other than proportional control can be performed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. 1 is a longitudinal sectional view of the electric control valve CB of the present embodiment, FIG. 2 is an exploded perspective view, FIG. 3 is an enlarged perspective view of a rotor assembly, and FIG. 4 is an enlarged perspective view of a valve body.

(1) Configuration As shown in FIGS. 1 and 2, the electric control valve C
B is, for example, a step motor, which includes a valve body assembly 10 having a joint or the like, a rotor assembly 20 having a magnet, a rotor, and the like, a can (case) 40 for covering the rotor assembly 20; The coil assembly 50 and the like that are fitted to the outside of the vehicle 40 are provided.

In the valve body assembly 10, an outlet joint 12 is disposed immediately below the cylindrical valve chamber 11 in the axial direction, and a valve seat 13 is formed at a boundary between the valve chamber 11 and the outlet joint 12. 13 is provided with a port portion 13 a for communicating the valve chamber 11 and the outlet joint 12. An inlet joint 14 is provided on the side near the upper surface of the port 13a.
Is provided with an opening 14a to be connected to the second member. The valve seat 13 is provided with a one-turn type slide type valve element 21 (to be described in detail below) (FIGS. 3 and 4).
Is arranged. 15 is a flanged lower lid, 15a is a lower lid 1
A stopper 15b protruding at a predetermined position 5 and defining a stop position of the rotor assembly 20, which will be described later, and 15b is an O-ring-shaped cushioning member made of an elastic body fitted to the stopper 15a. 16
Is a spring pin.

As shown in FIG. 3 and FIG. 4, the valve body 21 is a substantially cam-shaped "valve closing control section" provided on the lower surface side (in FIG. 4, the front side surface side) of the short cylindrical main body portion 21a. A certain protrusion 21b is formed. This substantially cam-shaped profile plays an important role. A valve-closing core (recess) 21d, which is an oval-shaped “recess for increasing pressure reception”, is formed inside the protrusion 21b,
The sliding contact area of the sliding contact surface 21c with the valve seat 13 formed on the front side surface of the protruding portion 21b is reduced, and the pressure receiving area is reduced to improve the valve closing function (sealability). With this complete valve closing function, the accuracy of valve leakage prevention can be increased.

A positioning notch 21e having a step in the direction of the longitudinal axis of the side surface of the main body 21a is formed, and a lower positioning portion 22a of the valve body holder 22 described below is fitted therein (FIG. 3).
On the upper surface side (the rear surface side in FIG. 4) of the main body portion 21a,
A hole 21f into which the engagement protrusion 22c (FIG. 3) of the valve body holder 22 is inserted is formed.

As shown in FIG. 2, a coil spring (mounting spring) is provided between the valve body holder 22 and the lower surface of the rotor 28.
25, and by the additional load of the spring 25,
The valve body 21 is pressed against the valve seat 13. Due to this pressing, the degree of freedom of the valve element 21 is limited only to the rotation direction. Valve body holder 22
A shaft portion 28b of a rotor 28 to be described later
A cut-off prevention part 22d for preventing the lower end of the head from coming off is formed. Reference numeral 22b denotes a positioning portion for positioning with the rotor 28.

A rotor stopper 31a protrudes from the lower end surface of the cylindrical magnet 31. Further, a concave portion 31b is provided around the center of the inner surface of the magnet 31. The resin flows into the concave portion 31b as described later, and the magnet 31 and the rotor 28
Play can be eliminated.

The rotor 28 is made of synthetic resin, and has a substantially cylindrical outer peripheral portion 28a and a substantially oval (FIG. 3) sectional support shaft portion 28 formed upward from the center of the outer peripheral portion 28a.
b, and a connecting portion 28d connected to the valve body holder 22.

The magnet 31 and the rotor 28 are integrally formed, and the magnet 31 is fixed along the outer periphery of a mold (not shown) for forming the rotor 28.
These are integrally formed by injecting a synthetic resin into the mold. At the time of this injection, the resin flows into the concave portion 31b, and there is no play due to a change with time. As described above, since the rotor 28 and the magnet 31 are integrally formed, a portion where a gap is formed in the conventional example shown in FIG. 8 is closely contacted, no gap is formed, and this state changes thereafter. Never. In addition, the generation of abnormal noise in the conventional portion shown in FIG. 8 is prevented.

A support recess 41b is formed at the center of the upper lid 41a of the can body 41 constituting the can portion 40 (FIG. 2), and the support recess 41b is formed at the tip of the support shaft 28b of the rotor 28. The mating projection 28c is fitted and rotatably supported.

The coil assembly 50 is externally fitted to the can 40 (FIG. 1). The coil assembly 50 includes a coil 51 therein, and the coil 51 generates a magnetic field by flowing an electric current.
And assemble the rotor assembly 2 at a desired angle according to the number of pulses.
Rotate 0. The rotation of the rotor assembly 20 rotates the valve body 21 to change the opening area of the port 13a and control the flow rate.

When the rotor assembly 20 rotates, the stopper 31a of the rotor assembly 20 comes into contact with the stopper 15a of the lower lid 15 and is stopped by rotation at a predetermined angle. At the time of this stop, the stopper 15a is provided with an O-ring-shaped cushioning material 15b at the contact portion, so that abnormal noise generated at the location shown in FIG. 8 (conventional example) is reduced. be able to.

The tip of the support shaft 28b is
The first guide portion G1 (FIG. 1) is supported by the support concave portion 41b formed in the upper lid portion 41a, and is fitted to the inner wall of the valve chamber 11 on the outer periphery of the fitting portion 28e (FIG. 3) of the rotor 28. A second guide portion G2, and a gap L between the upper end and the lower end of the magnet 31 between the support portions Lb at both ends.
a, the rotation of the rotor assembly 20 is stabilized, collision and sliding contact between the magnet and the inner peripheral surface of the can is eliminated, and generation of abnormal noise in the conventional portion shown in FIG. Is prevented.

Further, since the rotor assembly 20 is pressed and supported from below by the coil spring 25, the rotation of the rotor assembly 20 can be further stabilized, and the rotor assembly can be prevented from wobbling, as shown in FIG. The generation of abnormal noise in the conventional part is prevented. In addition, since the above-mentioned sliding contact does not occur and the rotation of the rotor assembly 20 is stable, the magnet may be small in size, the whole can be reduced in weight and size, and the power supplied to the coil can be reduced. The power consumption can be small.

As described above, the engagement projection 28c for guiding the tip of the support shaft 28b is provided on the upper lid 4 of the can body 41.
Since the support recess 41b formed in 1a is configured to be supported, the support recess 41b can be formed at an accurate position at the same time as can molding, and the center position can be made accurate. So, like the conventional one,
The pin can be positioned more accurately and easily than when another member supporting the tip of the pin is fixed to the upper lid while the center of the pin is positioned.

(2) Operation Next, the operation of this embodiment will be described with reference to FIG.
FIG. 5 is a characteristic diagram showing a situation where the opening degree of the port portion 13a changes according to the rotation of the valve element 21.

FIG. 5A shows a case in which the port portion 13a is completely covered by the valve closing core portion 21d of the projecting portion 21b. As shown in the graph, the valve opening is fully closed. In this case, since the valve closing core portion 21d is formed as described above, the pressure receiving area is reduced, the sealing performance is enhanced, and no valve leakage occurs. In the case shown, the rotatable range (operating range) of the rotor assembly 20 is 300 °, and the operating range can be set to a desired range by the value of the width of the rotor stopper 31a. FIG. 5B shows that the valve element 21 is rotated 90 degrees counterclockwise.
°, the port portion 13a is opened by about 35% (see the symbol X of the curve shown by the dotted line in the graph). Similarly, FIG. 5C shows that the port portion 13a has about 65
%, And FIG. 5 (D) shows the port portion 1
3a is a case where 100% is opened.

In the case of the substantially cam-shaped projection 21b shown in FIGS. 4 and 5, the opening characteristic indicated by the dotted line in FIG. 5 is shown, but by appropriately changing the outer shape of the projection 21b. For example, the characteristic Y shown by a solid line and the characteristic Z shown by an alternate long and short dash line can be easily realized. That is, as described in the above-described conventional example, only proportional control was conventionally possible, but according to the present invention, desired control can be performed by arbitrarily setting the substantially cam-shaped protrusion 21b. Is possible.

[0032]

As described above, according to the present invention, a circular main body that hermetically slides on the inner wall of the valve chamber of the rotary valve body,
A valve-closing control section that is in sliding contact with the valve seat. The valve-closing control section changes the area covering the opening in accordance with the rotation angle of the valve element. In addition, complicated control other than proportional control can be performed.

Further, a biasing means for biasing the valve body in the direction of the valve seat is provided between the rotor and the valve body, and a pressure receiving portion between the valve closing control section and the valve seat is provided inside the valve closing control section. Since the increasing concave portion is formed, the degree of opening of the opening of the valve body can be controlled with high sealing accuracy.

Further, the rotor and the magnet are integrally formed to form a rotor assembly, a recess is formed in the center of the upper inner surface of the can, and the protrusion of the rotation support member of the rotor assembly is fitted to slide the rotation support member. Since it is freely supported, there is no gap between the rotor and the magnet, the rotation is stable, and the generation of abnormal noise due to collision or sliding contact can be prevented.

Further, since a guide portion rotatably fitted to the inner wall of the valve chamber is provided at the lower end of the rotor assembly, the rotor assembly can be rotated stably in cooperation with the recess of the upper lid of the can. Can be done.

In addition, a protrusion is formed at the lower end of the rotor assembly in parallel with the rotation axis direction, and a stopper is formed at an immovable portion of the electric control valve so as to abut the protrusion, and a buffer member is disposed on the outer periphery of the stopper. Therefore, generation of abnormal noise when the projection of the rotor assembly collides with the stopper can be suppressed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the embodiment.

FIG. 3 is an enlarged perspective view of the rotor assembly in FIG. 2;

FIG. 4 is an enlarged perspective view of a valve body in FIG.

FIG. 5 is a diagram illustrating the operation and characteristics of the embodiment.

FIG. 6 is a diagram showing an example of a usage form of an electric control valve.

FIG. 7 is an example of a valve element in a conventional electric control valve.

8A and 8B are diagrams showing another conventional electric control valve, in which FIG. 8A is a longitudinal sectional view, and FIG. 8B is a perspective view of a valve body.

[Explanation of symbols]

 CB Electric control valve 10 Valve body assembly 11 Valve room 12 Outlet joint 13 Valve seat 13a Port portion 14 Inlet joint 15 Lower lid 15a Stopper 15b Buffer material 20 Rotor assembly 21 Valve body 21a Valve body 21b Projection 21c Sliding contact Surface 21d Valve closing core part 22 Valve body assembly 25 Coil spring 28 Rotor 28c Engagement projection 31 Magnet 31a Rotor stopper 40 Can 41a Top lid part 41b Can concave part 50 Coil assembly 60 Stepping motor part

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 3H053 AA02 AA03 AA33 BA01 CA03 CA04 DA04 3H062 AA07 AA15 BB10 BB28 BB33 CC02 DD01 EE07 FF39 HH04 HH08 HH09 3H106 DA05 DA26 DB02 DB34 DC10 DD04 EE07 EE19 EE48

Claims (6)

[Claims] 1. A valve body rotating means comprising a magnet and a rotor is provided in a can having a coil on an outer periphery thereof, and a valve body assembly having a cylindrical valve chamber is provided at a lower end of the can. Wherein the valve body assembly comprises an opening formed in a valve seat of the valve chamber, and a fluid inlet / outlet provided with the valve seat interposed therebetween, and the valve body being rotated by the rotor. An electric control valve that opens and closes the opening in accordance with the rotation angle of the valve, wherein the valve body is formed in a circular main body provided in the valve chamber, and the valve protrudes from the main body and hermetically slides on the valve seat. An electric control valve, comprising: a closing control unit, wherein an area covered by the valve closing control unit is changed according to a rotation angle of the valve body. 2. The electric control valve according to claim 1, wherein the valve body rotating means comprises a step motor. And a biasing means for biasing the valve element in a valve seat direction between the rotor and the valve element, wherein the valve closing control section and the valve seat are provided inside the valve closing control section. The electric control valve according to claim 1, wherein a concave portion for increasing the pressure receiving is formed. 4. A rotor assembly formed by integrally molding a magnet on the outer periphery of a synthetic resin rotor, forming a recess in the center of the upper inner surface of the can, and fitting the protrusion of the rotation support member of the rotor assembly. 3. The electric control valve according to claim 1, wherein the rotation support member is slidably supported. 5. The electric motor according to claim 1, wherein a guide portion rotatably fitted to an inner wall of the valve chamber is provided at a lower end of the rotor assembly. Type control valve. 6. A lower end of the rotor assembly is formed with a projection parallel to a rotation axis direction, and a stopper is formed at an immovable portion of the electric control valve to contact the projection.
The electric control valve according to any one of claims 1 to 4, wherein a buffer member is disposed on an outer peripheral portion of the stopper.