JP2755538B2 - Electric flow control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric flow control valve used for controlling a flow rate of a fluid such as a refrigerant used in a refrigeration cycle.

[0002]

2. Description of the Related Art A conventional electric flow control valve known in Japanese Patent Application Laid-Open Nos. 62-63282 and 4-68910 is as shown in FIG. A valve having a primary port 1a and a secondary port 1b, and a valve seat 3a provided in a communication valve port 3 of a secondary port side partition 2 (formed by an inner hole of a valve seat 4 screwed and fixed to the partition 2). A main body A, a rod-shaped needle valve 5 having a long length that comes into contact with and separates from a valve port valve seat 3a of the valve main body A, and a cylinder fixed to an outer portion of the valve main body A opposite to the secondary port 1b. A closed case 6 and a stator coil 9 disposed outside the case.
A stepping motor M which is provided with a rotor 10 which can be moved in the valve opening / closing direction and is rotated by energization of a stator coil 9 inside the motor, and a stepping motor M which can be controlled by a pulse. 5, a valve operating mechanism B for opening and closing the first port 1a, a first flow path Pa is connected to the primary port 1a, and the primary port 1a
The second flow path Pb is connected to the secondary port 1b which is orthogonal to.

The closed case 6 comprises a lower lid 7 and a can 8, and the rotor 10 has a cylindrical sleeve 11
And a cylindrical permanent magnet 12 fitted to the outside of the sleeve 11.

The valve actuating mechanism B has a tubular fixed guide 14 which is screwed and fixed to the valve housing projection 13 of the valve body A (with a screwed screw portion caulked). The inner female screw portion of the sleeve 11 is screwed into the portion. The upper end shaft portion 5a of the needle valve 5 inserted inside the guide 14 is inserted into the center hole of the connection wall on the upper portion of the sleeve 11. The needle valve 5 is fastened with a shaft stopper 15 such as a shaped ring so as to move integrally with the rotor 10, and the needle valve 5 is disposed between the lower step of the valve shaft 5a and the inner end washer 16 of the sleeve connecting wall. With a valve-closing buffer spring 17 urged in the valve-closing direction (downward in FIG. 6), the rotor 10
Is rotated, the rotor 10 moves in the axial direction while rotating by the screw feed action of the valve operating mechanism B, and this rotor 1
The needle valve 5 is moved in the opening / closing direction by the rotation movement of 0, so that the flow rate of the fluid corresponding to the pulse signal given to the stator coil 9 can be controlled.

[0005] In the drawing, reference numeral 18 denotes a valve-closing restricting pin threaded at the lower end of the sleeve 11 so that the amount of protrusion can be adjusted, and is fixed to the valve body A when the needle valve 5 is closed (press fit and fixed). 3), the outer peripheral surface of the fully closed stopper 19 is abutted as shown in FIG.
Numeral 20 denotes a valve opening regulating pin screwed at the upper end of the sleeve 11 so that the amount of protrusion can be adjusted.
Abuts the fully open stopper 21 at the upper end of the can when fully opened,
The valve opening limit of the rotor 10 is regulated.

[0006]

In the conventional electric flow control valve, the rotor 10 of the stepping motor M has a cantilevered support structure by the tubular fixed guide 14, so that the rotor 10 rotates when the valve is closed and when the valve is opened. There is a disadvantage that the vibration is generated and noise is generated from the threaded portion of the valve operating mechanism B due to the rotational vibration of the rotor 10.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problem, and an object of the present invention is to provide a low-noise motorized flow control valve which suppresses the rotational vibration of the rotor to reduce noise. is there.

[0008]

In order to achieve the above-mentioned object, in the present invention, there is provided a primary valve 1a and a secondary port 1b communicating with a valve chamber 1, and a communication valve port 3 of a secondary port side partition 2 is provided. The valve body A is provided with a valve seat 3a, and the needle valve 5 which comes into contact with and separates from the valve opening valve seat 3a of the valve body, and is fixed to an outer portion of the valve body A opposite to the secondary port 1b. A stepping motor M having a closed case 6 and a stator coil 9 disposed outside the case and having a rotor 10 movable inside the case 6 in a valve opening / closing direction and rotated by energization of the stator coil 9 in a valve opening / closing direction; And a valve operating mechanism B for opening and closing the needle valve 5 by a screw feed action caused by the rotation of the rotor of the stepping motor. A bearing packing 40 made of a synthetic resin material is disposed and attached to the rear end of the permanent magnet 12 in the valve closing movement direction so as to be in sliding contact with the inner peripheral surface of the case 6. Valve actuation mechanism B
The rotor 10 is rotatably and movably held by a support structure at both ends.

A cylindrical bush 30 having a female thread portion 31 and a bearing portion 32 inside the valve operating mechanism B and fixed to the valve body A, and a male thread portion screwed to the bush female thread portion 31 And a valve holder 35 having a rotary bearing 37 guided by the bush bearing 32 and fixed concentrically to the center of the rotor 10. A needle having a valve element is provided in the valve holder 35. It is also possible to incorporate a valve 5 ′. In this case, a bearing packing 40 formed of a synthetic resin material is attached to the rear end of the permanent magnet 12 constituting the rotor 10 in the valve closing direction in the case 6. By arranging and mounting so that it comes into sliding contact with the peripheral surface,
The rotor 10 can be held rotatably and position-movable by the support structure at both ends by the bearing packing 40 and the valve operating mechanism (the bush bearing 32).

[0010]

According to the electric flow control valve having the above construction, the rotor 10 is held rotatably and position-movable by the both ends supporting structure of the bearing packing 40 and the valve operating mechanism B, and the rotor packing is damped by the damping effect of the bearing packing 40. Can be suppressed, and the generation of noise can be reduced.

[0011]

1 to 4 show a first embodiment of the present invention.
More specifically, the electric flow control valve according to the first embodiment includes a valve body A, a stepping motor M, and a valve operating mechanism B similar to those of the prior art. The structure is the valve port 3 of the valve body A.
Is formed in the same manner as the conventional one, except that it is formed by a communication hole formed in the secondary opening side partition 2. Therefore, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

In the first embodiment, the valve actuating mechanism B has a female screw portion 31 and a bearing portion 32 on the inside, and the resin cover 33 of the valve main body A hangs down into the valve chamber 1. The rotor 10 (made of synthetic resin) includes a cylindrical bush 30 buried and fixed in the bush, a male screw portion 36 screwed into the bush female screw portion 31, and a rotation bearing portion 37 guided by the bush bearing portion 32. And a valve holder 35 concentrically embedded and fixed at the center of the sleeve 11).

A needle valve 5 'having a valve element structure which is urged in the valve protruding direction by a compression spring 38 into the valve holder 35, and a fixing ring 39 for regulating the position of the needle valve 5' (the valve) A function of adjusting the position of the needle valve 5 ′ with respect to the valve seat 3 a of the main body A at the time of valve assembly).
At the rear end (upper end in the figure) in the valve closing movement direction
As shown in FIG. 3, four bent portions 40a and sleeve fitting holes 40 are formed from a synthetic resin material such as ethylene fluoride.
b of the bearing packing 40 having an outer peripheral bent portion 40a.
As shown in FIG. 2, the bearing packing 40 and the valve actuating mechanism are fixed so that they do not fall off by sliding engagement with the inner peripheral surface of the case 6 (can 8). The rotor 10 is rotatably and position-movable by a support structure at both ends by a (bush bearing portion 32).

The engagement length of the female thread portion 31 and the male thread portion 36 is set to be equal to or slightly longer than the opening / closing stroke of the needle valve 5 '. When the needle valve 5' is fully opened as shown in FIG. The male screw portion 36 is disengaged from the bush female screw portion 31 and a return spring 42 is incorporated between the sleeve rear end recess 11a of the rotor 10 and the case 6 (can upper end 8a).

When the needle valve 5 'is closed, the return spring 42 separates from the can upper end 8a as shown in FIG. 4, and when the needle valve 5' is fully opened, it comes into contact with the can upper end 8a and compresses as shown in FIG. The rotor 10 and the valve holder 35 are connected to the holder external thread 36 by the bush internal thread 3.
It acts to urge in the direction in which it meshes with 1.

The threaded portion of the female thread portion 31 and the male thread portion 36 is disposed in the valve chamber 1 of the valve body A as shown in FIG. 4, and a fluid containing an oil component supplied into the valve chamber 1 ( For example, a refrigerant) is lubricated in the threaded portion.

In the drawing, reference numeral 18a denotes a valve-closing restricting pin integrally projecting from the lower end of the sleeve 11, and 19a denotes a fully-closed stopper integrally projecting from the resin lid 33 of the valve body A. When the needle valve 5a is closed, the pin 18a
4 comes into contact with the outer peripheral surface of the fully closed stopper 19a as shown in FIG. Reference numeral 43 denotes a motor connector having a coil energizing terminal 44.

FIG. 5 shows a conventional permanent magnet 1 constituting the rotor 10 in the conventionally known motorized flow control valve shown in FIG. 6 (the same parts are denoted by the same reference numerals and detailed description of the structure is omitted).
A bearing packing 40 formed of a synthetic resin material and having a configuration as shown in FIG. 3 is provided at a rear end portion (upper end portion in the drawing) in the valve closing movement direction of FIG. The rotor 10 is rotatably and position-movably held by a bearing packing 40 and both ends supported by the valve operating mechanism (the tubular fixed guide 14). is there.

The bearing packing 40 has a bent portion 40.
The one having no a (the one having the outer peripheral sliding contact portion abutting on the inner peripheral surface of the can 8) is also applicable.

[0020]

According to the electric flow control valve of the present invention, the rotor 10 is held rotatably and position-movable by a structure in which both ends are supported by the bearing packing 40 and the valve operating mechanism B, so that the bearing packing 40 is damped. Rotor 1 by effect
0 rotational vibration can be suppressed, and the generation of noise can be reduced.

The length of the threaded portion of the valve operating mechanism B (the length of the threaded portion of the female screw portion 31 and the male screw portion 36) is the same as or slightly longer than the opening / closing stroke of the valve needle type needle valve 5 '. When the needle valve 5 'is fully opened, the holder male thread 36 is disengaged from the bush female thread 31 when the needle valve 5' is fully opened, and is compressed between the rotor 10 and the case 6 when the needle valve 5 'is fully opened. The rotor 1
5 and 6, the valve holder 35 is provided with a return spring 42 that urges the holder male thread 36 in a direction in which the holder male thread 36 meshes with the bush female thread 31. As shown in FIG. The structure can be simplified by eliminating the stopper 21, and the generation of noise due to the abutment between the valve opening regulating pin 20 and the fully opened stopper 21 can also be eliminated.

Further, the threaded portion of the valve operating mechanism B (the threaded portion of the female screw portion 31 and the male screw portion 36) is disposed in the valve chamber 1 of the valve body A, and is supplied into the valve chamber 1. In the case where the fluid containing the oil component is lubricated to the threaded portion, no noise is generated on the threaded surface, and the reliability of the threaded portion is improved.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing an electric flow control valve according to a first embodiment of the present invention in an open state.

FIG. 2 is an enlarged sectional view of a main part of the electric flow control valve.

FIG. 3 is a perspective view of a bearing packing incorporated in the electric flow control valve.

FIG. 4 is a central longitudinal sectional view showing the electric flow control valve of FIG. 1 in a closed state.

FIG. 5 is a central longitudinal sectional view showing an electric flow control valve according to a second embodiment of the present invention in an open state;

FIG. 6 is a central longitudinal sectional view showing a conventional electric flow control valve in a closed state.

[Explanation of symbols]

A: valve body, 1: valve chamber, Pa: first flow path, Pb: second flow path, 1a: primary port, 1b: secondary port, 2: secondary port side partition,
3 ... communication valve port, 3a ... valve seat, 5 ... rod-shaped needle valve,
5 ': valve needle valve, 6: sealed case, 7: lower lid, 8: can, 9: stator coil, 10: rotor,
11: sleeve, 12: cylindrical permanent magnet, M: stepping motor, 18, 18a: valve closing control pin, 19, 19
a: fully closed stopper, B: valve operating mechanism, 30: bush,
31: Bush internal thread, 32: Bush bearing, 33
... Resin lid of valve body, 35 ... Valve holder, 36 ... Male screw part of the holder, 37 ... Rotation support part of the holder, 38 ... Compression spring, 40 ... Bearing packing, 40a ... Bearing part of outer circumference of bearing packing, 41 ... Locking tool, 42: return spring, 43: motor connector part.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 31/04

Claims (3)

(57) [Claims] A first port and a second port communicating with the valve chamber;
A valve body provided with a valve seat at the communication valve port of the secondary port side partition;
A needle valve that comes into contact with and separates from a valve seat of a valve body;
Airtight case fixed to the outer part opposite to the secondary port of
And a stator coil disposed outside the case.
By energizing the stator coil inside the case
A rotor that can move in the direction of opening and closing the rotated valve is provided.
Stepping motor and rotor of the stepping motor
The needle valve is opened and closed by the screw feed action of rotation.
An electric flow control valve comprising:
The valve actuating mechanism has a female screw part and a bearing part inside,
A cylindrical bush fixed to the valve body and this bush
Male screw part screwed into female screw part and bush bearing part
Having a rotary bearing portion guided in the center of the rotor
And a concentrically fixed valve holder.
In addition to incorporating a needle valve with a valve element in the
With a sleeve and a cylindrical permanent magnet constituting the rotor,
Synthetic resin at the rear end of this permanent magnet in the valve closing direction
Slide the bearing packing formed by the above on the inner peripheral surface of the case.
The bearing packing and the valve
The rotor is rotated and supported by a two-sided support
Electric flow rate control characterized by holding the position movably
valve. 2. The threaded length of said female thread and said male thread is
Set the same or slightly longer than the opening / closing stroke of the needle valve.
When the needle valve is fully open,
Meshed and disengaged from the female
The needle valve is fully opened between the rotor and the case.
The rotor and valve holder are compressed
Return that biases in the direction where the thread engages the bushing internal thread
2. The spring according to claim 1, wherein the
The electric flow control valve according to any one of the preceding claims. 3. A screwed portion of the female screw portion and the male screw portion.
Is disposed in the valve chamber of the valve body, and
Fluid containing oil components is lubricated to the thread
The electric flow control valve according to claim 1, wherein