JPH0317388Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal protector device used to protect a compressor from overheating.

In general, compressors for coolers can cause abnormal temperature rises due to the wrong type of refrigerating oil, overfilling or underfilling of refrigerating oil, overfilling or underfilling of refrigerant gas, or incorrect setting pressure of the expansion valve, resulting in burnout. This can lead to serious problems.

Conventionally, in order to prevent such problems, a thermal protector using a rectangular cylindrical metal container with a movable electrode inside and a fixed electrode facing the movable electrode was attached to the outer wall of the compressor using appropriate mounting hardware. It was installed and used.

However, with this structure, since the thermal protector is attached to the outer wall of the compressor, there is a problem with the thermal response of the thermal protector, making it impossible to establish a highly safe and reliable cooling system. Ta.

Therefore, it is possible to create a circular hole on the compressor side that is easy to mold, and insert a thermal protector using a rectangular cylindrical metal container that fits into this hole, but in this case, there is a gap between the compressor hole and the thermal protector. This creates a problem in that air-tightness cannot be maintained and Freon gas inside the compressor leaks out.

The present invention has been devised in view of the above circumstances, and provides a thermal protector device that can improve the safety and reliability of the cooling system.

An embodiment of the present invention will be described below with reference to the drawings.

As shown in Fig. 1, the thermal protector 1
The molded resin bead 2 is placed in a state where the movable electrode plate 5 on which the thermally responsive element 8 having the contact point 7 is supported and fixed together with the sub-plate 9 is opposed to the fixed electrode plate 4 having the contact point 6 via the insulating plate 3. Fixed by Electrode leads 10 and 11 are connected to the terminal portions of each electrode plate to form a mount body. This mount body is inserted into the metal container 13 of the sparrow.

The metal container 13 has a cylindrical insertion portion 13a into the compressor body, and an inclined surface with an inclination angle of 30° to 60° so that the opening upper end 13b can be brought into close contact with the outer peripheral surface of the compressor main body via the heat-resistant rubber packing 16. The opening lower end 13c has a cylindrical shape having a diameter larger than the diameter of the insertion portion 13a. The metal container 13 is made of corrosion-resistant aluminum, which is the same material as the compressor.

Metal container 1 having a flange portion 20 at the open end
3 is provided with a mount body in which a fixed electrode plate 4 and a movable electrode plate 5 are integrated with a resin bead 2, and as shown in FIG. The resin bead 2 is fitted into the cutout 19, the electrode leads 10 and 11 are passed through the hollow cylindrical holder 14, the hollow cylindrical holder 14 is positioned at the open end of the metal container 13, and the gap in the same area is closed. It is sealed by filling it with a sealant 15.

The hollow cylindrical holder 14 prevents the sealant 15 around the bases of the electrode leads 10, 11 from being damaged and causing leakage when the electrode leads 10, 11 are bent. That is, the hollow cylindrical holder 14
By providing this, the fulcrum when the electrode leads 10, 11 are bent is formed at a location away from the root of the electrode leads 10, 11, so the sealant 15 may be damaged due to bending, and the thermal protector 1 may be damaged. The risk of leaks is extremely reduced.

Note that the slit 21 formed in the hollow cylindrical holder 14 is for sufficiently distributing the sealant 15 to be filled into the gap at the open end of the metal container 13.

When heat resistance is required as the sealant 15, it is preferable to use a silicone rubber compound; however, in other cases, various combinations such as epoxy resin or a combination of epoxy resin and silicone rubber are possible.

The thermal protector according to the embodiment of the present invention is constructed by attaching the heat-resistant rubber packing 16 to the flange portion 20 of the metal container 13, inserting this metal container into the hole 12 of the protruding mounting portion 17 of the compressor body, and
The thermal protector 1 is fixed to the compressor main body by screwing the mounting screw 18 inserted into the center of the hollow cylindrical holder 14 into the threaded part of the mounting portion 17 of the compressor main body until it is in a completely tight state to prevent leakage. There is.

As explained above, the thermal protector device of the present invention has a structure in which the thermal protector is inserted into the compressor body, so it has good thermal response and therefore can improve safety and reliability. The efficiency of the cooling cycle can be improved. In addition, the thermal protector device of the present invention has a packing interposed between the inclined surface of the flange of the thermal protector and the outer peripheral edge of the compressor body, and the mounting screw is screwed into the threaded portion of the compressor body from the outside. Since it is tightened, it is possible to reliably prevent leakage of freon gas in the compressor of an air conditioner, for example. Furthermore, by providing a hollow cylindrical holder, the fulcrum when the electrode lead is bent is formed at a location away from the root of the electrode lead, so bending may damage the sealant and cause damage to the thermal protector itself. It is also possible to eliminate the fear of leakage.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a thermal protector device according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an example of a hollow cylindrical holder. 1... Thermal protector, 2... Molded resin bead, 4... Fixed electrode plate, 5... Movable electrode plate, 1
0, 11... Electrode lead, 12... Hole in compressor body, 13... Metal container, 14... Hollow cylindrical holder, 16... Rubber packing, 17... Mounting part of compressor body, 18... Mounting screw, 19
...notch part of hollow cylindrical holder, 20... flange part.

Claims (1)

[Scope of utility model registration request] A mount body including a movable electrode, a fixed electrode facing the movable electrode, a resin bead to which the movable electrode and the fixed electrode are fixed, and electrode leads connected to the movable electrode and the fixed electrode, respectively, and led out to the outside. Further, the resin bead is fitted into a notch formed at one end of the hollow cylindrical holder, the external lead wire is passed through the hollow cylindrical holder, and the mount body is attached to a flange portion having an inclined surface. a thermal protector provided in a cylindrical metal container having an open end, the hollow cylindrical holder being sealed to the open end of the metal container with a sealant, and having a hole inside; and a compressor body provided with a protruding mounting portion having a threaded portion on the outer peripheral surface, the metal container is inserted into the hole, and the inclined surface of the flange portion and the outer periphery of the hole of the compressor body are inserted into the hole. The thermal protector is fixed to the compressor body by interposing a rubber packing between the hollow cylindrical holder and the compressor body, and screwing a mounting screw inserted into the central portion of the hollow cylindrical holder into a threaded portion of the compressor body. protector device.