JPH11150903A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor which prevents penetration of moisture from a lead wire of a sealed motor installed at a motor operated valve, etc. SOLUTION: A motor operated valve 1 is equipped with a stator 20 and a rotor 22 within a sealed can 10 as a housing. The output shaft 24 of the rotor 22 rotates a screw rod 36 through a gear, thereby elevating or lowering a valve shaft 42. The outside of the can 10 is covered with resin molding 70, and the lead wire of the motor is embedded in the molding 70. The lead wire is divided within the molding, and the core wires 82a and 82b of the lead wires 80a and 80b are coupled with each other by solder 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor constituting a motor-operated valve used in a refrigeration cycle, and more particularly to a structure of a motor lead wire.

[0002]

2. Description of the Related Art Conventionally, as a motor-operated valve, for example, a stepping motor is housed in a sealed container, and a valve stem having a threaded portion is driven by an output shaft of the motor to provide a valve seat provided on a valve body. The valve element and the orifice are in contact with the refrigerant, but the valve stem is covered with bellows etc., so that the refrigerant enters the motor side. A structure for preventing such a phenomenon is known from Japanese Patent Application Laid-Open No. 4-228894. In this device, the outside of the can housing the motor is covered with a molded resin material to prevent intrusion of moisture etc. contained in the outside air, and the lead wire for driving the motor is molded integrally with the resin. Is done. The lead wire passes through the can and is connected to the motor stator.

[0003]

The lead wire connected to the motor has a structure in which a core wire as a conductor is covered with a resin or the like. The core wire has a structure in which small-diameter conductive wires are twisted, and has a structure that can withstand bending. Therefore, a fine space exists inside the core wire, and a fine space also exists between the core wire and the coating.

[0004] Since the portion of the can close to the main body is cooled by the circulation of the refrigerant by the operation of the motor disposed inside the can, dew condensation occurs inside the can. When this condensation occurs, the moisture contained in the outside air further enters the inside of the can through the minute space of the lead wire of the motor, resulting in condensation.
As described above, external moisture enters the can by the so-called respiratory action and dew forms. The condensed moisture has a bad influence on the motor. SUMMARY OF THE INVENTION The present invention provides a motor that solves a problem caused by the invasion of moisture into the inside of a motor.

[0005]

A motor to which the present invention is applied comprises a can, which is a closed container, a stator and a rotor disposed inside the can, a plastic molding covering the outside of the can, and a plastic molding integrated with the can. The lead wire for connecting the stator of the motor and the external power supply is divided into two parts inside the molding, and the core part of the cut two lead wires is joined with solder to form a joint portion. It is a feature.

Further, the present invention is characterized in that the above-mentioned lead wire is divided into a lead wire on the motor side and a lead wire on the power supply side, and a connecting portion is formed by connecting these lead wires with solder. You do it. According to such a motor, the moisture that invades through the micro space formed in the core of the lead wire is stopped by the micro space being blocked by the coupling portion, and the moisture is stopped by the coupling portion. And further intrusion into the motor side is prevented.

[0007]

FIG. 1 is an explanatory view showing a sectional structure of a motor-operated valve to which a motor according to an embodiment of the present invention is applied. The motor-operated valve denoted by reference numeral 1 has a motor including a stator 20 fixed in a can 10 which is a housing of the motor, and a rotor 22. The motor shaft 24 attached to the rotor 22 drives the pinion 30, and the gear 32 meshing with the pinion 30 rotates the drive shaft 36 via the driver 34. The drive shaft 36 is screwed into a screw portion formed on the valve body 40, and the drive shaft 36 converts a rotary motion into a linear motion to move the valve shaft 42 up and down. Valve shaft 42
A valve body 44 is attached to the tip of the valve body, and adjusts an opening degree of a flow path between the valve body 44 and a valve seat 50 provided in the valve body 40.

[0008] Two pipes 52 and 54 are connected to the valve body 40 so as to communicate with the refrigerant inlet and outlet. One end of a bellows 48 is attached to the valve shaft 42.
Is attached to a ring 46 fixed to the valve body 40. The bellows 48 has a function of preventing the refrigerant from entering the motor side while allowing the valve shaft to move up and down.

The outside of the can 10 is covered with a resin molding 70 to be waterproof. A lead wire 80 connected to the motor is integrated into the molding 70. The lead wire 80 has a core wire 82 and a coating layer 84 covering the core wire, and the core wire 82 is connected to the stator 20 of the motor.

FIG. 2 shows the structure of the lead wire,
Is covered with a covering layer 84 made of an insulating plastic material. Since the core wire 82 is composed of a large number of small-diameter conductors, there is a gap between the conductors. There is also a minute gap between the core wire 82 and the coating layer 84. When the lead wire 80 is buried in the molding 70 as it is, the lead wire 8 is changed according to a temperature change inside the can 10.
The moisture in the air invades the inside of the can through the minute space inside the inside of the can and causes a phenomenon of dew condensation.

However, in the embodiment of the present invention, FIG.
The lead wire is cut in the middle as shown in FIG.
0a and 80b, and a structure is employed in which the cores 82a and 82b are joined by solder 100 to form a joint. Thus, the solder 100 at the joint is made of the core wires 82a,
This penetrates into the inside of the core wire 82b and closes the minute space formed in the core wire, so that the invasion of moisture is stopped at the above-mentioned joint, and the invasion of moisture is prevented. In addition, the two lead wires 80a and 80b are integrally formed with the molding 70 together with the joint.

For example, assuming that the lead wire 80a is connected to a power supply outside the motor-operated valve, the moisture contained in the outside air passes through the minute space formed in the core wire 82a and passes through the lead wire 80b on the motor side. However, since the minute space in both core wires 82a and 82b is closed at the joint, moisture cannot enter the motor side. Further, moisture that enters between the core wire 82a of the lead wire 80a and the coating layer 84a is also suppressed by the molding of the joint.

[0013]

As described above, according to the present invention, a connection portion is formed in the middle of a lead wire connected to a housing of a motor used in a humid environment or the like, and a fine portion formed inside the lead wire is formed. It provides a structure that blocks the space. With this structure, it is possible to block moisture entering from the outside through the inside of the lead wire due to a temperature change in the housing of the motor, thereby achieving waterproofing.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor-operated valve embodying the present invention.

FIG. 2 is an explanatory view showing a general structure of a lead wire.

FIG. 3 is an explanatory view showing a structure of a connecting portion of a lead wire according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric valve 10 Can 20 Stator 22 Rotor 24 Output shaft 36 Screw rod 40 Valve main body 44 Valve body 50 Valve seat 70 Resin molding 80 Lead wire 82 Core wire 100 Solder

Claims (2)

[Claims] 1. A motor characterized in that a lead wire is divided into a power supply side and a motor side, and a core wire of the divided portion has a joint portion joined by solder. 2. A stator and a rotor of a motor disposed inside a can, which is a closed container, a plastic molding covering the outside of the can, and integrally embedded in the plastic molding to connect the stator of the motor to an external power supply. A motor comprising a lead wire, wherein the lead wire is divided into two parts inside a molding, and the core wires of the two cut lead wires are joined by solder.