JP2934571B2 - Protector for hermetic electric compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This application relates to a protector for use in a hermetic electric compressor, and an object thereof is to provide a protector which can be easily mounted and has high reliability.

[0002]

2. Description of the Related Art Conventionally, various types of protectors have been used to protect the hermetic electric compressor from overheating due to overload or the like. Some use a thermally responsive switch mounted in a sealed housing. The heat-responsive switch may be mounted on a coil of an electric motor by means of a strap as shown in a conventional example of Japanese Utility Model Application Laid-Open No. 55-87170, or may be mounted on an electric motor.
As disclosed in "Overload protection device for hermetic compressor" in Japanese Patent Publication No. 3 (1993) -1995, there is a device mounted inside a housing by an elastic body.

[0003] In the case where the protector is tied to the coil with a tying string or the like, there is a problem that the mounting work is not easy and it takes much time. On the other hand, the overload protection device of Japanese Utility Model Application Publication No. 60-95183 is mounted inside the sealed housing by an elastic body, so that the work of mounting the overload protection device becomes easy. It is necessary to install parts for mounting the device, and to take extra space in the sealed housing of the electric compressor, since a sufficient insulation distance is required between the sealed housing and the motor winding. Or
The sealed housing needs to be extra large.

On the other hand, for example, Japanese Patent Laid-Open No. 62-2967
In JP-A-39-28 and JP-A-63-28246, "protectors for hermetic electric compressors" and the like, a mounting terminal such as a tab or a receptacle is fixed to the protector, and the protector is housed in the socket or outside the socket. The fixed terminal is shown in which the mounting terminal is directly attached to the pin of the glass sealed terminal of the sealed housing.

[0005]

However, in the case where the mounting terminal fixed to the protector as described above is directly mounted on the glass sealed terminal of the sealed housing, the mounting of the protector becomes easy and the mounting position is minimized. Therefore, it is not necessary to consider the extra space in the sealed housing of the electric compressor or to make the sealed housing extra large, but torsion is caused in the fixed part between the protector and the mounting terminal due to vibration during operation of the electric compressor. There is a problem that a large load is applied due to bending or bending, and the conventional method does not always provide sufficient strength, which causes deformation or dropping of the terminal.

[0006]

SUMMARY OF THE INVENTION Accordingly, a protector for a hermetic electric compressor according to the present invention is provided with an electric motor and a compressor inside a hermetic housing.
Hermetic electric compressor housing airtightly with compressor
Attached to the conductive terminal of the glass sealed terminal
A thermally responsive opening and closing device comprising a metal hermetic container and one or more conductive pins insulated and fixed through the hermetic container, wherein a connection terminal is conductively fixed to the conductive pin or the hermetic container. Device, having a box-shaped holder made of an electrical insulator, provided with a thermally responsive switch storage unit and a terminal storage unit in a concave portion of the holder,
The container portion of the heat responsive switch housed in the thermally responsive switch housing portion, the terminal accommodating portion accommodating a fixing portion between the connection terminal of the heat responsive switch, airtight wherein thermally responsive switch Content
The container end face is brought into close contact with the holder,
The electrically insulative filler filling the storage section
This insulating material is prevented from flowing into the
Is hardened to disperse the force applied to the fixing portion around,
One of the connection terminals is a sealed housing of a sealed electric compressor.
Direct connection to the conductive terminal of the sealed glass terminal provided on the housing
The movement of the connection terminal with respect to this conductive terminal is regulated and changed.
Surround the ends of the connection terminals to prevent shape and damage.
The holder is provided with a flat holding part and is connected to a thermoresponsive switch.
Only the terminal housing that has received the fixed part with the terminal is electrically insulated
The thermo-responsive switch is hardened and fixed with a conductive filler.
Expose the part to a space where the refrigerant can flow to facilitate heat exchange
It is characterized by having.

[0007] In this manner, the tip of the connection terminal is surrounded by the holder.
By providing the connection terminal holding part
Connection terminal so that it does not substantially move.
Can prevent deformation and damage such as bending and twisting
You.

Also, lead terminals and connection terminals of a thermoresponsive switch.
With an electrically insulating filler that hardens the area around the
The thermoresponsive switch with glass sealed terminals
Even when directly connected to the conductive terminals of
Forces such as torsion and bending due to motion are dispersed around
Deformation of the fixed part, dropout from the thermo-responsive switch, thermal responsive opening and closing
It is possible to prevent the glass used for the sealing part of the container from being damaged.
Wear. In addition, close the outer edge of the thermoresponsive switch and the inner surface of the holder.
To separate the inside of the holder and lead the thermoresponsive switch
Filling and curing the filler only on the side where the terminal and the connection terminal are fixed
The fixed structure allows the heat-responsive opening inside the holder to open.
Refrigerant circulates through the space around the closure, improving heat exchange efficiency.
Response to heat generation due to motor overheating, compressor malfunction, etc.
The performance is improved.

[0009]

Embodiments will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a hermetic electric compressor having a so-called high-pressure housing to which a protector (hereinafter referred to as a protector) for an hermetic electric compressor of the present invention is attached. FIG. FIG. The hermetic electric compressor 1 constitutes a hermetic housing composed of a lid 2 and a lower housing 3, in which a motor 4 and a compressor 5 having a known structure are housed and fixed.
A suction pipe 6 for introducing a refrigerant sent from a heat exchanger (not shown) to the compressor 5 is connected through the hermetic housing, and the refrigerant compressed by the compressor 5 is discharged into the hermetic housing. Then, it flows around the motor and is sent again from the discharge pipe 7 to the heat exchanger. A through hole is provided in a part of the sealed housing, in the embodiment, the lid 2, and a glass sealed terminal 8 for connecting the electric motor 4 inside the sealed housing to an external power supply is hermetically fixed by welding or the like in this through hole. Have been. A lubricating oil 9 for the electric motor 4 and the compressor 5 is sealed in the sealed housing.

In the embodiment, the glass sealed terminal 8 has three conductive terminals 8A, 8B and 8C, and each of the conductive terminals is air-tightly fixed with an electrically insulating material such as glass.
Tab terminals for connection are attached to the inside of the sealed housing for each conductive terminal.
A lead wire 10 from the winding of the motor is connected to B and 8C, and a protector 11 is connected to the remaining 8A.

The protector 11 is shown in FIGS.
This will be described with reference to FIG. FIG. 3 is a plan view of the protector 11 in a temporarily fixed state before being filled with an electric insulating material described later, and FIG. 4 is a BB view of FIG. 3 after the electric insulating material is filled.
It is principal part sectional view of a cross section. The protector 11 accommodates and fixes a thermally responsive switch 12 having an airtight metal container having a known structure as shown in FIG. 5A, for example, in an electrically insulating holder 13 as shown in FIG. 5B. I have. The thermally responsive switch 12 has a well-known structure using a thermally responsive element such as a bimetal. The description of the structure is omitted, but for example, Japanese Patent Application Laid-Open Nos.
No. 36335.

Lead terminals 12A and 12B are hermetically fixed to the thermally responsive switch 12 through an airtight container with an electrically insulating sealing material 12C such as glass or ceramic. Connection terminals 14A and 14B for connection with the above-mentioned glass sealed terminal 8 and a lead wire 10 from an electric motor are conductively connected and fixed to each lead terminal by welding or the like. In this embodiment, the connection terminal 14A is connected to the conductive terminal 8A of the glass sealed terminal, and the connection terminal 14B
Is connected to a lead wire 10 from an electric motor.

The holder 13 has a substantially box shape, and is divided into a terminal storage portion 13C by storing a thermally responsive switch in a storage portion 13B by a step portion 13A provided inside the holder 13. A connection terminal holding portion 13D for holding a connection portion between the connection terminal 14A and the conductive terminal 8A of the above-mentioned glass sealed terminal 8 is provided on the outer periphery.

The heat-responsive switch housing 13B of the holder 13
A pressing portion 13E is provided on the inner wall of the device. When the thermally responsive switch 12 is mounted on the holder 13, the pressing portion 13E is provided.
By 3E, the end face of the closed container of the thermally responsive switch is pressed against the step 13A and is brought into close contact therewith, and at the same time, the thermally responsive switch is temporarily fixed to the holder by this pressing force.

The thermoresponsive switch 12 includes connection terminals 14A, 14A.
After fixing B to the predetermined lead terminals 12A and 12B, respectively, the tip of the connection terminal 14A is inserted into the connection terminal holding portion 13D of the holder 13 and at the same time, the main body of the thermoresponsive switch 12 is inserted into the thermoresponsive switch housing portion 13B and The fixing portion side of the lead terminal and the connection terminal is inserted into the terminal storage portion 13C and temporarily fixed. In this state, a liquid electrically insulative filler 15 such as an epoxy resin mixed with a hardening agent is filled in the terminal accommodating portion 13C of the holder 13 with each lead terminal 1 of the thermally responsive switch 12.
The thermoresponsive switch 12 is fixed to the holder 13 by injecting and hardening so as to cover the fixed portions of the connection terminals 2A and 12B and the connection terminals 14A and 14B. This state is shown in FIGS.

The structure of the holder 13 is the electrically insulating filler 1
5 is a structure that flows into the thermally responsive switch housing portion 13B side
And the heat exchange efficiency between the refrigerant and the thermoresponsive switch becomes worse,
In the embodiment of the present invention, as described above, the sealing of the thermoresponsive switch 12 is performed.
When the container end face is brought into close contact with the step 13A of the holder 13, the electrically insulating filler 15 is placed in the heat-responsive switch housing 1
And in the manner it does not flow into the 3B. Therefore, filler 15
And the refrigerant can circulate in the space around the thermally responsive switch 12 stored in the storage portion 13B, so that the heat exchange efficiency is improved, and the responsiveness to heat generation due to overheating of the motor, abnormalities of the compressor, etc. Is improved. As shown in FIG. 7, a vent 13F is formed in the wall of the holder on the side of the heat-responsive switch housing.
Is provided, the heat exchange efficiency between the refrigerant and the thermally responsive switch can be further improved.

In order to improve the adhesion between the thermally responsive switch 12 and the holder 13, for example, as shown in an enlarged view of the main part of FIG. The electrically insulative filler 15 is provided so as to be in close contact with the thermally responsive switch 12, or to provide an elastic body such as silicone rubber in this portion, so that the thermally responsive switch housing 13B
Can be prevented from flowing into Further, the holder 13 may be formed of a material having sufficient elasticity.

By fixing the periphery of the fixing portion between the lead terminal and the connection terminal of the thermally responsive switch with the hardened electrically insulating filler as described above, the thermally responsive switch can be directly connected to the conductive terminal of the glass sealed terminal. Even in the case of connection, forces such as torsion and bending due to vibration of the electric motor applied to the fixing portion are dispersed to the periphery, so that deformation of the connection terminal and dropout from the thermally responsive switch can be prevented. At the same time, by adopting such a structure, the electric compressor that transmits to an electrically insulating sealing material such as glass or ceramics holding the lead terminals 12A and 12B of the thermally responsive switch 12 can be used. The burden caused by the vibration can be reduced, and the occurrence of cracks in the sealing material and the loss of airtightness of the thermally responsive switch 12 can be prevented.

Further, by providing the holder 13 with a connection terminal holding portion 13D for holding the front end of the connection terminal 14A so as to surround the same, the connection terminal 14A is substantially immovable so that the connection terminal 14A is particularly bent on the bent portion 14A1 of the connection terminal. The burden can be dispersed and reduced. Therefore, even if the protector 11 is connected and fixed to the glass sealing terminal with only one connection terminal 14A, the load for fixing does not concentrate on the connection terminal 14A or its bent portion 14A1, and the connection by the protector's own weight or vibration. Deformation or damage such as bending or twisting of the terminal can be prevented.

Although the embodiment has been described by taking an electric compressor having a high-pressure housing as an example, the present invention is not limited to this, and the present invention can be similarly applied to an electric compressor having a so-called low-pressure housing. . Also, the type of the compressor is not limited, and it goes without saying that a rotary type compressor such as a rotary type or a scroll type or a reciprocating type compressor such as a reciprocating type may be used.

[0021]

As described above, by fixing the periphery of the fixed portion between the lead terminal and the connection terminal of the thermally responsive switch with the hardened electrically insulating filler, the thermally responsive switch can be sealed with the glass sealed terminal. Even if it is directly connected to the conductive terminal, it can disperse forces such as torsion and bending caused by vibration of the motor, etc., and an excessive load is imposed on the fixing part and the sealing and fixing part of the lead terminal of the thermally responsive switch. Therefore, it is possible to prevent deformation and dropout of the connection terminal of the thermally responsive switch and deterioration of airtightness due to breakage of a sealing material of the thermally responsive switch.

Since the lead terminals and the connection terminals are embedded in the electrically insulating material, the distance between the terminals can be made relatively small, and the size of the thermally responsive switch can be easily reduced.

Further, by providing the connection terminal holding portion on the holder, the connection terminal is not substantially moved with respect to the holder, so that the load on the connection terminal due to vibration of the motor can be reduced. Deformation and breakage can be prevented.

Further, the outer edge of the thermally responsive switch and the inner surface of the holder are brought into close contact with each other to partition the inside of the holder, and the filler is filled only in the fixing portion between the lead terminal and the connection terminal of the thermally responsive switch and hardened and fixed. In addition to saving the filler material, the heat exchange efficiency is improved by providing a space for the refrigerant to flow around the thermally responsive switch in the holder, and the heat generation due to overheating of the motor and abnormalities of the compressor etc. Responsiveness is improved. In addition, by providing the ventilation hole in the wall of the holder on the side of the heat responsive switch housing side, the heat exchange efficiency between the refrigerant and the heat responsive switch can be further improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a hermetic electric compressor using a protector of the present invention.

FIG. 2 is a sectional view of the hermetic electric compressor shown in FIG.

FIG. 3 is a plan view of the protector according to the embodiment of the present invention at the time of temporary fixing.

FIG. 4 shows B after filling the electrically insulating material of the protector of FIG. 3;
FIG.

FIG. 5 (A) used in the embodiment of FIG.
FIG. 2 is a perspective view of a thermoresponsive switch, and FIG.

FIG. 6 is a perspective view of the protector of FIG. 3 after filling with an electrically insulating material.

FIG. 7 shows another embodiment of the holder used in the protector of the present invention.

FIG. 8 is an enlarged view of a main part of another embodiment of the holder.

[Explanation of symbols]

 1: Hermetic electric compressor 8: Glass sealed terminal 11: Protector 12: Thermoresponsive switch 12A, 12B: Lead terminal 12C: Electrically insulating sealing material 13: Holder 13D: Connection terminal holding portion 14A, 14B: Connection terminal 14A1: Bent portion 15: Electrically insulating filler

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F04B 39/00 106

Claims (1)

(57) [Claims] (1)Motor and compressor in a sealed housing
Gala of hermetic electric compressor housed airtightly with refrigerant
Protector that is attached to the conductive terminal of the sealed terminal
hand,  A metal hermetic container and an insulated
Having one or more conductive pins, wherein
The device has a thermally responsive switch having connection terminals conductively fixed thereto, and a box-shaped holder made of an electrically insulating material.
The thermal responsive switch housing is provided with a container portion of the thermal responsive switch.
Is stored in the terminal storage part, and the connection with the connection terminal of the thermoresponsive switch is
I store the wearing part,Here, the end of the airtight container of the thermo-responsive switch is in close contact with the holder.
Said that For terminal storageFilledElectricity
Marginal fillerDo not flow into the thermo-responsive switch compartment
And This electrically insulating filler Hardening force applied to the fixed part
AroundDisperse, One of the connection terminals is a hermetic housing of a hermetic electric compressor.
Directly connected to the conductive terminal of the sealed glass terminal
Continued, The movement of the connection terminal with respect to this conductive terminal is regulated to
Around the end of the connection terminal to prevent loss.
The holder on the holder, The terminal housing that receives the fixed part between the thermoresponsive switch and the connection terminal
By fixing and fixing only the storage part with electrically insulating filler
Exposing other parts of the thermoresponsive switch to a space where refrigerant can flow
Sealed electric compressor characterized by easy heat exchange
Protector.