JP3325702B2 - 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 No. 62-63282 and Japanese Patent Publication No. 4-68510 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 which comes into contact with and separates from the valve port valve seat 3a of the valve main body A, and a lower part fixed to an outer side opposite to the secondary port 1b of the valve main body A. A cylindrical closed case 6 including a lid 7; a stator coil D disposed outside the closed case 6; and a valve opening / closing direction disposed inside the case 6 and rotated by energization of the stator coil D in a valve opening / closing direction. The position of the rotor C can be moved and the needle feed operation by the rotation of the rotor. 5 comprises a valve actuating mechanism B for opening and closing operation, the primary port 1a of the valve body A first flow path Pa
And a second flow path Pb is connected to a secondary port 1b orthogonal to the primary port 1a.

The rotor C includes a cylindrical sleeve 15 and a cylindrical permanent magnet 16 fitted on the outside of the sleeve 15. Further, the valve operating mechanism B has a tubular fixed guide 19 fixed to the valve housing projecting opening of the valve body A, and an inner peripheral female thread of the sleeve 15 is screwed to an outer male thread of the fixed guide 19. The upper end shaft portion of the needle valve 5 inserted inside the fixed guide 19 is
It is inserted into the center hole of the upper connecting wall and fastened by a shaft stopper such as a C-shaped ring so as to move integrally with the rotor C, and the lower end of the valve stem and the inner end of the sleeve connecting wall. Close the needle valve 5 to the washer (downward in FIG. 4).
When the rotor C is rotated by interposing a valve-closing buffer spring 9 for urging the rotor C, the rotor moves in the axial direction while rotating by the screw feed action of the valve operating mechanism B. By moving the needle valve 5 in the opening and closing direction, the flow rate of the fluid corresponding to the pulse signal given to the stator coil D can be controlled.

The stator coil D includes a yoke 10 having a plurality of pole teeth and a coil 13 wound around a coil bobbin 11 inside a cylindrical cup-shaped stator cover 17.
(The lead wire 21 for energization is connected)
A sealing material 1 such as an epoxy resin is
8 is injected and filled.

The motor-operated flow rate control valve constructed as described above sequentially changes the pulse input to each phase of the coil 13 so that the rotation determined by the number of pole teeth of the yoke 10 is alternately combined. The rotor C rotates at an angle, and the position of the needle valve 5 with respect to the valve seat 3a is set to 1 by the valve operating mechanism B.
By changing for each pulse, the flow rate of the fluid is controlled.

[0006]

The conventional electric flow control valve has a structure in which a sealed case 6 for preventing fluid from flowing out is arranged between a rotor C and a stator coil D. Therefore, the gap (air gap) between the inner periphery of the pole teeth of the yoke 10 constituting the stator coil D and the outer periphery of the permanent magnet 16 constituting the rotor C becomes large, resulting in poor magnetic efficiency and occurrence. Since the torque is small, the rotor C and the stator coil D must be large in order to obtain the torque required for the valve operation, and disadvantages such as a high excitation current are required. In addition, since the impedance and the moment of inertia are large, the rotation efficiency is poor.

In addition, since the stator coil D is placed in the atmosphere, the sealing material 1 is placed inside the stator cover 17 to prevent the risk of dew condensation due to temperature fluctuation and dielectric breakdown.
8 is required to be injected and filled, which has the disadvantage that it becomes larger and more expensive.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a small, inexpensive, high-efficiency motorized flow control valve with improved magnetic efficiency and rotational efficiency.

[0009]

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. , A valve body A provided with a valve seat 3a, a case body 6a fixed to an outer portion of the valve body A, and a plurality of hermetic terminals 8
And a cover 7 fixed to the case main body 6a. The pole teeth 10 are provided in an internal space cut off from the outside of the closed case 6 composed of the case main body 6a and the cover 7.
a plurality of yokes 10 a to 10 d each having a built-in stator coil D in contact with each other, and inside the stator coil D, pole teeth 10 a to 10 d of the yoke 10 are provided.
And a rotor C which is opposed to the rotor C with a predetermined gap therebetween and is capable of moving up and down, which rotates in proportion to a pulse signal inputted to the stator coil D, and a needle integrated with the rotor C by a screw feed action by the rotation of the rotor. The valve 5 was configured to open and close.

The case body 6a and the yoke 10
Is preferably formed by pressing a soft magnetic stainless steel plate. Further, in order to easily assemble the stator coil D, the stator coil D is divided into a plurality of winding bobbin portions 11a and a shaft portion 15a of the rotor C.
And a bearing portion 12 that guides the rotor C and rotationally supports the rotor C.
A plurality of yokes 10 having 10d and a plurality of contacts 14 to which the hermetic terminals 8 are electrically coupled are integrally insert-fixed, and a coil 13 electrically connected to the contacts 14 is wound around the bobbin portion 21. It is desirable to configure as a molded winding body having an integrated structure.

[0011]

The motor-operated flow control valve having the above-described structure is provided with a stator coil D inside the closed case 6 (an internal space isolated from the outside).
And the rotor C is disposed inside the stator coil D. Therefore, the inner circumference of the pole teeth 10a to 10d of the yoke 10 forming the stator coil D and the permanent magnet 16 forming the rotor C It is possible to improve the magnetic efficiency and rotational efficiency by reducing the gap (air gap) with the outer periphery of the valve (for example, about 0.1 mm to 0.3 mm), to reduce the size of the entire valve, and to reduce the cost.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to FIGS. In the figure, A is a valve body having a primary port 1a and a secondary port 2a communicating with the valve chamber 1 and a valve seat 3a provided at a communication valve port 3 of the secondary port side partition 2; The first flow path Pa is connected to the port 1a, and the second flow path Pb is connected to the secondary port 1b orthogonal to the primary port 1a as shown in FIG.

Reference numeral 6a denotes a cylindrical case main body having an open upper end fixed to the outer side opposite to the secondary port 1b of the valve main body A. Reference numeral 7 denotes a case fixed by welding to the upper end opening of the case main body 6a. Cover (for example, a stainless steel material).
A plurality (four in the embodiment) of hermetic terminals 8 which are fixed at a and protrude outward and inward are arranged as shown in FIG.

D is a stator coil which is built in an internal space which is cut off from the outside of the sealed case 6 composed of a case body 6a and a cover 7. This stator coil D has a plurality of winding bobbin portions 11a and a rotor. When the molding bobbin 20 made of an electrically insulating resin (for example, polyphenylene sulfide resin) having a bearing portion 12 that guides the shaft portion 15a of C and rotatably supports the rotor C is formed by injection molding,
A plurality of yokes 10 having a to 10d and a plurality of contacts 14 to which the hermetic terminals 8 are electrically coupled are integrally insert-fixed as shown in FIGS. As shown in FIG. 1, the connected coil 13 is formed as a molded wound body having an integrated structure in which the coil 13 is wound.

The pole teeth 10a to 10a of the yoke 10
3, d is exposed on the inner peripheral surface of the forming bobbin 20 as shown in FIG. 3, and the flange of the yoke 10 has its outer peripheral portion partially exposed on the outer peripheral surface of the forming bobbin 20, and is exposed on the inner peripheral surface of the case body 6a. As shown in FIG. 1, they are in contact with each other and form a magnetic path.

The rotor C comprises a sleeve 15 having a shaft portion 15a for rotation support guided by the bearing portion 12 of the stator coil D, and a cylindrical permanent magnet 16 fixed to the outer periphery of the sleeve 15. A rod-shaped needle valve 5 is integrally fixed to the center of the sleeve 15.

A valve actuating mechanism B is formed by an outer male screw portion of the needle valve 5 and a screw body 19a having a female screw portion meshing with the male screw portion and fitted into the valve housing opening of the valve body A. Is configured.

Therefore, the rotor C is connected to the stator coil D
, The rotor C and the needle valve 5 move in the axial direction while rotating by the screw feed action of the valve operating mechanism B, and are given to the stator coil D by the opening and closing movement of the needle valve 5. Fluid flow rate control corresponding to the pulse signal can be performed.

The shaft portion 15a and the needle valve 5 are located at the center of rotation of the rotor C.
A is wound with a spring 9a. The spring 9a is a spring that applies a load so that the screw end faces always come into contact with each other when the threaded portion of the needle valve 5 comes off, and has a spring load greater than the weight of the rotor C.

[0020]

The motor-operated flow control valve of the present invention has a structure in which a stator coil D is disposed in an internal space that is isolated from the outside of the sealed case 6, and a rotor C is disposed inside the stator coil D. Therefore, a gap (air gap) between the inner circumference of the pole teeth 10a to 10d of the yoke 10 forming the stator coil D and the outer circumference of the permanent magnet 16 forming the rotor C
Can be reduced to about 0.1 mm to 0.3 mm, and the magnetic efficiency and the rotational efficiency can be improved to provide a high-efficiency, compact, and inexpensive electric flow control valve.

Further, since the stator coil D is housed in the closed case 6, dew condensation due to temperature fluctuation does not occur, filling of the sealing material is omitted, and downsizing and cost reduction can be achieved.

Further, the case body 6a and the yoke 10
In the case of claim 2 formed by pressing a soft magnetic stainless steel plate, the corrosion resistance and magnetic properties of the case body 6a and the yoke 10 can be improved, and the stator coil D can be formed as described in claim 3. When it is configured as a molded winding body, effects such as facilitating assembly of the stator coil D into the closed case 6 and reducing the cost by simplifying the assembling operation can be obtained.

[Brief description of the drawings]

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

FIGS. 2A and 2B are explanatory views of a configuration of a stator coil winding body incorporated in the electric flow control valve of the present invention, wherein FIG. 2A is a plan view and FIG. .

FIG. 3 is a configuration explanatory view showing the stator coil winding body of FIG. 2 in a perspective view of a half section.

FIG. 4 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, 1a: primary port, 1b: secondary port,
2 ... Secondary port side partition, 3 ... Communication valve port, 3a ... Valve seat, 5 ... Needle valve, 6 ... Sealed case, 6a ... Case body, 7 ... Cover, 8 ... Hermetic terminal, B ... Valve operating mechanism, D ... stator coil, 10 ... yoke, 10a to 10d ... pole teeth,
11a: winding bobbin, 12: bearing, 13: coil,
14 contact, 20 molding bobbin, C rotor, 1
5: sleeve, 15a: shaft portion, 16: permanent magnet.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-48245 (JP, A) JP-A-2-188198 (JP, A) Fully open 60-191777 (JP, U) Really open 1962 24178 (JP, U) JP-A 3-117175 (JP, U) JP 4-24377 (JP, Y2) JP 4-22230 (JP, Y2) JP 3-13006 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 31/00-31/05 H02K 37/20 F25B 41/06

Claims (3)

(57) [Claims] 1. A valve body having a primary port and a secondary port communicating with a valve chamber and a valve seat provided at a communication valve port of a secondary port side partition, and a case body fixed to an outer portion of the valve body. A plurality of yokes having a cover in which a plurality of hermetic terminals are arranged and fixed to the case body, and pole teeth built in an internal space isolated from the outside of a sealed case formed by the case body and the cover; And a pulse signal to be input to the stator coil which is disposed inside the stator coil and which faces the pole teeth of the yoke with a predetermined gap therebetween. and vertically movable rotor rotating in proportion to the valve operation of the rotor and integral with the needle valve is opened and closed by a screw feed action of the rotor rotation
A driving mechanism, wherein the stator coil is guided by a shaft of the rotor.
Bearing and a plurality of winding bobbies for rotatingly supporting the rotor.
Pole teeth on an electrically insulating resin molding bobbin
The plurality of yokes and the hermetic terminal are electrically connected.
Insert-fixing multiple contacts to be joined together
And a bobbin portion electrically connected to the contact.
An electric flow control valve, wherein the electric flow control valve is formed as a molded wound body having an integrated structure in which an il is wound . 2. An outer peripheral portion of a flange of the yoke is formed by the component.
Exposed on the outer periphery of the bobbin
The electric flow control valve according to claim 1, wherein the valve is in contact with the electric flow control valve. 3. The case body and the yoke are connected to a soft magnetic stay.
Characterized by being formed from pressed stainless steel sheet
An electric flow control valve according to claim 2 .