JP2002054756A - Electric operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric operated valve preventing the occurrence of rust at outer periphery of a can. SOLUTION: This electric operated valve 1 is constituted such that a rotor 16 and a valve element 17 are arranged in the inside in which a valve main body part 20 and the can 15 are sealed and joined, a stator part 30 composed of a cylindrical coil part 35 is arranged at outer periphery of the can 15, and a resin mold cover 40 covering the stator part 30 is provided. A small hole 50 communicating a clearance space S formed between the resin mold cover 40 and the can 15 with the outside and having a hole diameter ϕ of 2 mm is formed in the resin mold cover 40 of the stator part 30.

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, and more particularly to a motor-operated valve suitable for being incorporated in a refrigeration cycle as a flow control valve or the like.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of a motor-operated valve.
The illustrated motor-operated valve 1 ′ has a valve body 2 having an inlet 21 on one side and an outlet 22 on the bottom.
The lower end of a cylindrical can 15 having an inverted bottom and made of a metal material such as stainless steel is hermetically joined by welding or the like.
6 and a valve element (needle valve) 17 are arranged, a stator part 30 including a cylindrical coil part 35 is arranged on the outer periphery of the can 15, and a resin mold cover 40 ′ covering the stator part 30 is provided. Have been. A fluid (refrigerant) introduction pipe 26 is connected to the inflow port 21 of the valve body 20, and a fluid discharge pipe 27 is connected to the outflow port 22.

[0003] An L-shaped stator fixing member 60 in side view is fixed to one side lower surface of the stator portion 30 for preventing the rotation of the stator portion 30, positioning, and preventing the stator portion 30 from coming off. The stator fixing member 60 is provided at a plurality of locations (for example, four
L-shaped fixing plate which is externally fitted to one of the mounting protrusions 42, 42,... Protruded at the position, and which is fixed by melting and crushing the mounting protrusion 42 by, for example, an ultrasonic welder. A portion 62 and a semi-cylindrical curved surface portion which is bent vertically downward from both left and right sides of the distal end portion of the L-shaped fixing plate portion 62 and elastically pressed into engagement with the fluid introduction tube 26 is formed. And a forked elastic holding piece portion 64.

In the electric valve 1 ′ having such a structure, the stator 30 is pushed from above the can 15 to fit over the outer periphery thereof, and the stator fixing member 60 is used to position the valve body 20 in the position shown in the figure. The rotor 16 is rotated by energizing the coil portion 35, and the rotation of the rotor 16 is converted into a lifting motion of the valve body 17 by a screw feed mechanism. The flow rate is adjusted by changing the area of the orifice 10 formed at the bottom.

[0005]

In the conventional motor-operated valve 1 'as described above, the infiltration of moisture such as moisture and rainwater from the outside is prevented by the resin mold cover 40'. When actually used in a refrigeration cycle, rust may be generated on the outer periphery of the can 15, which may be caused by moisture adhering to the outer periphery of the can 15 due to dew condensation or the like due to the influence of the temperature of the fluid. The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric valve in which rust hardly occurs on the outer periphery of a can.

[0006]

In order to achieve the above object, a motor-operated valve according to the present invention basically has a rotor and a valve body disposed inside a canister hermetically joined to a valve body. A motor-operated valve provided with a stator portion formed of a cylindrical coil portion on the outer periphery of the can and provided with a resin mold cover for covering the stator portion, wherein the resin mold cover of the stator portion includes the resin mold cover. It is characterized in that a small hole is formed for communicating a gap space formed between the mold cover and the can with the outside. As described above, by forming the small holes in the resin mold cover, the moisture adhering to the outer periphery of the can due to dew condensation or the like will naturally pass through the small holes after a certain time (usually about 90 minutes) elapses. Then, the outer periphery of the can is dried.

In this case, when the diameter of the small hole is increased, the moisture on the outer periphery of the can is easily released, but conversely, moisture and moisture from the outside easily enter the clearance space. Therefore, setting the hole diameter of the small holes is important. According to the experiments performed by the inventors of the present application, the amount of evaporation of moisture to the outside from the gap space around the can periphery and the degree of drying are good regardless of the hole diameter if the hole diameter of the small hole is about 1 mm or more. It turned out that.

On the other hand, the larger the diameter of the small hole, the larger the amount of rust generated by the invasion of moisture from the outside. Therefore, in a preferred embodiment of the motor-operated valve according to the present invention, the diameter of the small hole is However, in order to form a small hole having a hole diameter of about 1 mm in the resin mold cover, it is necessary to set a very fine pin having a diameter of about 1 mm on a molding die, and in practice, the strength is reduced. Difficult. Therefore, in a more preferred embodiment, the motor-operated valve incorporated in an air conditioner, a refrigerator, or the like has a hole diameter of about 2 mm in a more preferable embodiment in consideration of the fact that the outer diameter of the can is 15 to 20 mm.
It is said.

In the motor-operated valve according to the present invention having the above-described structure, the motor-operated valve adheres to the outer periphery of the can through the small hole formed in the resin mold cover without greatly impairing the prevention of the entry of moisture from the outside. Moisture naturally escapes to the outside,
Since the outer periphery of the can is dried, rust on the outer periphery of the can due to dew condensation or the like due to the influence of the temperature of the fluid can be effectively prevented. Further, since the small holes also function as air vent holes when the stator portion is pushed into the can and mounted thereon, effects such as improvement of the mountability of the stator portion and the assemblability of the motor-operated valve are obtained. .

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a motor-operated valve according to the present invention. The motor-operated valve 1 of the illustrated embodiment includes
In the center of the top surface portion 40a of the resin mold cover 40, a small hole 50 is formed, which communicates a gap space S formed between the resin mold cover 40 and the can 15 with the outside.

The configuration other than the above is the same as that of the conventional motor-operated valve 1 'shown in FIG. 2 described above, and a description thereof will be omitted. In the motor-operated valve 1 of this embodiment,
Has an outer diameter D of 15 mm to 20 mm, and the hole diameter φ of the small hole 50 formed in the resin mold cover 40 is the result of the salt spray test described below (1) and the moisture drying test described below (2), and It is set to 2 mm in consideration of the convenience in manufacturing the mold.

That is, as can be understood from the results of the salt spray test of the following (1), the rust-preventing effect due to the invasion of moisture from the outside is small when the pore diameter φ of the small hole 50 is small (for example, about 3 mm). The following is more effective. On the other hand, as can be understood from the results of the moisture drying test described in (2) below, the quick drying property of the moisture attached to the outer periphery of the can 15 due to dew condensation or the like due to the influence of the temperature of the fluid is remarkable due to the formation of the small holes 50. To improve. At this time, if the hole diameter φ is 2 mm or more, there is no difference in the drying time.

(1) Salt spray test Electric valve A (conventional example) without small holes 50, small holes 5
0 is a motor-operated valve B having a hole diameter φ of 1 mm, and the hole diameter φ of a small hole 50 is 3
The motor-operated valve C of mm and the motor-operated valve D exposing the outer periphery of the can 15 (there is no resin mold cover 40 portion) are prepared, salt water is sprayed from the outside thereof, and the occurrence of rust on the outer periphery of the can 15 is observed. did. The test results are shown in Table 1 below.
Shown in

[0014]

[Table 1]

(2) Moisture drying test Electric valve A (conventional example) without small hole 50, small hole 5
0, a motor-operated valve E having a hole diameter φ of 2 mm (this embodiment), a small hole 5
The motor-operated valve F having a hole diameter φ of 0 mm of 4 mm and the hole diameter φ of the small hole 50 of 6
mm of a motor-operated valve G, water is poured into the gap space S,
The atmosphere temperature was set to 50 ° C., and the dried state was observed. The test results are shown in Table 2 below.

[0016]

[Table 2]

In Table 2, .largecircle. Indicates that the sample was completely dried, .DELTA. Indicates that the water content was reduced, and X indicates that no sign of drying was observed. In the motor-operated valve 1 according to the present embodiment having the above-described configuration, the moisture adhering to the outer periphery of the can 15 through the small hole 50 formed in the resin mold cover 40 naturally escapes to the outside, and the outer periphery of the can 15 Is dried, the rust on the outer periphery of the can 15 due to the dew condensation or the like due to the temperature of the fluid can be effectively prevented, and the rust due to the ingress of moisture from the outside can be effectively suppressed.

In addition, the small hole 50 is provided in the can 15
It also functions as an air vent when the stator part 30 is pushed in and mounted, so that the effect of improving the mountability of the stator part 30 and the assemblability of the motor-operated valve 1 is obtained.

[0019]

As will be understood from the above description, in the motor-operated valve of the present invention, the moisture adhering to the outer periphery of the can through the small hole formed in the resin mold cover naturally escapes to the outside,
Since the outer periphery of the can is dried, the generation of rust on the outer periphery of the can due to the dew condensation or the like due to the influence of the temperature of the fluid can be effectively prevented, and the generation of rust due to moisture from the outside can be effectively suppressed. In addition, the small hole also functions as an air vent hole when the stator portion is pushed into the can and mounted thereon, so that effects such as improvement in the mountability of the stator portion and the assemblability of the motor-operated valve are obtained. .

[Brief description of the drawings]

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

FIG. 2 is a partially cutaway longitudinal sectional view showing an example of a conventional motor-operated valve.

[Description of Signs] 1 Motorized valve 15 Can 16 Rotor 17 Valve element 20 Valve body 30 Stator 35 Coil 40 Resin mold cover 50 Small hole S Clearance space

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Claims (3)

[Claims] 1. A rotor and a valve body are disposed inside a valve body and a can which are hermetically joined, and a stator comprising a cylindrical coil is disposed on an outer periphery of the can. A motor-operated valve provided with a resin mold cover for covering the portion, wherein a small hole is formed in the resin mold cover of the stator portion for communicating a gap space formed between the resin mold cover and the can with the outside. A motorized valve. 2. The motor-operated valve according to claim 1, wherein a diameter of the small hole is 3 mm or less. 3. The motor-operated valve according to claim 1, wherein an outer diameter of the can is 15 to 20 mm, and a diameter of the small hole is about 2 mm.