CN102915875A - Thermal-response switch - Google Patents
Thermal-response switch Download PDFInfo
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- CN102915875A CN102915875A CN2011102193984A CN201110219398A CN102915875A CN 102915875 A CN102915875 A CN 102915875A CN 2011102193984 A CN2011102193984 A CN 2011102193984A CN 201110219398 A CN201110219398 A CN 201110219398A CN 102915875 A CN102915875 A CN 102915875A
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- fixed
- thermal response
- response switch
- plate
- outer casing
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Abstract
The invention discloses a thermal-response switch for a refrigerant compressor. The thermal-response switch can quickly and accurately detect temperature change and the like of a refrigerant by improving internal and external thermal conductivity of an airtight container, and is provided with an outer casing made of metal and a pressure-resistant airtight container consisting of a cover plate. The cover plate consists of a metal plate and a conductive terminal pin airtightly penetratingly fixed on the metal plate. An opening of the outer casing is welded to the surface of the cover plate circumferentially in a projection manner so that the pressure-resistant airtight container is formed. Since a radiating pin made of metal and serving as a radiating portion is welded and fixed to the outer surface of the outer casing, the total surface area of the outer casing is increased on the condition of not changing the basic structure of the thermal-response switch.
Description
Technical field
The present invention relates to the thermal response switch that a kind of thermal response switch, particularly structure that uses bimetal leaf etc. is applicable to the employed sealed electrical compressors such as air-conditioning.
Background technology
All the time, the employed cold-producing medium such as air-conditioning has used to prevent that motor is because of the protective device of overheated or overcurrent scaling loss etc. with in the motor compressor.
Particularly in reactive situation of paying attention to abnormal conditions, protective device is installed in the closed container of sealed electrical compressor, and what therefore use is the thermal response switch with the withstand voltage gas-tight container of metal-made.
Patent documentation in the past, for example Japan speciallys permit communique No. 2519530, and Unexamined Patent 10-144189 communique discloses this thermal response switch, and this thermal response switch has for example structure of Figure 6 and Figure 7.Thermal response switch 101 consists of withstand voltage gas-tight container by metal-made outer casing 102 and cover plate 103.
Be installed on the gas-tight container medial end of one of them the conducting terminal pin 6A on the described cover plate 103, be welded and fixed and described travelling contact 7 contact 9 that is relatively fixed.On the gas-tight container medial end of another conducting terminal pin 6B, be welded and fixed an end of heater 10, the other end of heater 10 is weldingly fixed on the metallic plate 4.On the surface of the electric insulation filler 5 of gas-tight container inboard, have no to be close to gap the cover 11 of pottery system, to increase creepage distance, prevent that simultaneously the flying etc. when electric arc produces is attached on the filler.In addition, the electric insulation filling surface in the gas-tight container outside is being coated with the electrical insulating materials 12 such as epoxy resin, to obtain sufficient creepage distance.Therefore, even with the thermal response switch miniaturization, also can obtain sufficient electric insulation distance.The operating temperature of this thermal response switch 101 is to proofread and correct by being out of shape near the thermal response plate fixed part that makes gas-tight container from the outside.
This thermal response switch 101 is installed in the closed container of coolant compressor, with motor in series.Like this, the operating current of motor just flows through in the circuit of conducting terminal pin 6B-heater 10-metallic plate 4-outer casing 102-thermal response plate 8-travelling contact 7-fixed contact 9-conducting terminal pin 6A composition.During motor compressor work, the heater of thermal response switch and thermal response plate etc. are because operating current generates heat, still, under normal conditions, these heats are absorbed by the cold-producing medium around flowing through, therefore, the thermal response plate remains on below the operating temperature of setting, and "on" position is maintained.
If because of some reason, the temperature of cold-producing medium is in superheat state, perhaps the heating of thermal response switch inside is because of to some extent increases such as overcurrent, the thermal response plate is heated to more than the temperature of setting, its bending direction of thermal response board reversal then, make travelling contact break away from fixed contact, cut off the energising to motor, take precautions against the possible trouble that betides of the state of affairs such as scaling loss.In addition, contact welding etc. finally occurs through repetitive operation in the thermal response plate, causes carrying out the on-off action between contact, excessive electric current continue by the time, circuit is cut off in the then part of heater 10 fusing.
As previously mentioned, thermal response switch in the past can detect overheated or overcurrent and action, still, in recent years, for the variations in temperature that further detects cold-producing medium etc., needs further to improve the heat exchange performance of thermal response switch.Be installed in the thermal response switch of the closed container inside of sealed electrical compressor, the closed container that is made of metal as previously mentioned, therefore and the heat exchanger effectiveness of cold-producing medium higher, but, for the more definite variation that promptly detects cold-producing medium, need further to improve heat exchanger effectiveness, improve thermal response switch to the reactivity worth of environment temperature variation or heat dissipation capacity variation.
Summary of the invention
The objective of the invention is in the situation of the essential structure that does not change thermal response switch, a kind of compressive resistance that can keep gas-tight container is provided, can improve again the inside and outside heat conductivity of gas-tight container, the thermal response switch of the more definite variations in temperature that promptly detects cold-producing medium etc.
Thermal response switch of the present invention arranges the radiating parts such as metal cooling pin or heating panel by the surface at gas-tight container, increase the surface area of the gas-tight container of thermal response switch.
Exposure by such increase gas-tight container and cold-producing medium, improve heat exchanger effectiveness, then much less can improve the reactivity worth that refrigerant temperature is changed, when the flow of cold-producing medium changes, because change with the heat exchange amount of cold-producing medium, the temperature of thermal response switch outer casing inside also can change rapidly.Therefore, under normal circumstances, promptly pass to cold-producing medium by the heating with inside, the thermal response plate is remained on below the operating temperature, on the other hand, refrigerant temperature rise or the situation of the mobile abnormal of refrigerant gas under, then can make rapidly the thermal response plate reach operating temperature, cut off energising.
By adopting such hermetic type compressor thermal response switch, can improve the reaction speed to overheated or overcurrent, obtain higher protective value.
Description of drawings
Fig. 1 is the profile of the thermal response switch of the 1st embodiment.
Fig. 2 is the vertical view of the thermal response switch of Fig. 1.
Fig. 3 is the profile of the thermal response switch of the 2nd embodiment.
Fig. 4 is the vertical view of the thermal response switch of Fig. 3.
Fig. 5 is the side cut away view of the thermal response switch of Fig. 3.
Fig. 6 is the profile of a routine thermal response switch in the past.
Fig. 7 is the A-A profile of the thermal response switch of Fig. 6.
Each label represents in the accompanying drawing:
1,21 thermal response switchs
2,22 outer casings
3 cover plates
4 metallic plates
5 electric insulation fillers
6A, 6B conducting terminal pin
15 cooling pins
25 heating panels
Embodiment
Below in conjunction with accompanying drawing, describe the specific embodiment of the present invention in detail.The part identical with in the past thermal response switch used same mark, detailed.
The thermal response switch 1 of Figure 1 and Figure 2 has the withstand voltage gas-tight container that is made of metal outer casing 2 and cover plate 3.Cover plate 3 is made of metallic plate 4 and conducting terminal pin 6A and 6B.Metallic plate 4 is provided with through hole 4A, and conducting terminal pin 6A and 6B pass through hole 4A, and insulate airtightly by electric insulation fillers 5 such as glass and to be fixed on the metallic plate 4.With the peristome of outer casing 2 by the all-round surface that is welded on cover plate 3 of the modes such as projection welding, thereby consist of described withstand voltage gas-tight container.
In the present embodiment, be weldingly fixed on possibly on the outer surface of outer casing 2 by will be as 8 of radiating part metal cooling pin 15 heat conduction, thereby in the situation that does not change the thermal response switch essential structure, increase the total surface area of outer casing.Therefore, this thermal response switch is installed in the closed container of sealed electrical compressor, when making it be exposed in the cold-producing medium, cold-producing medium flows through between the cooling pin as radiating part, increase Exposure, thereby improved the heat exchanger effectiveness of thermal response switch 1 with cold-producing medium.
During normal operation, although because flowing through the heatings such as the operating current in the thermal response switch, thermal response plate 8 and heater 10, to refrigerant loses heat, therefore, thermal response plate 8 remains on below the operating temperature this heat by outer casing 2 and cooling pin 15.Therefore, during normal operation, thermal response switch is failure to actuate, and the work of motor compressor does not stop.
If when rising because of the temperature of some reason cold-producing medium, the heat from thermal response switch 1 to cold-producing medium moves and tails off, then the temperature of thermal response switch inside rises.In addition, during mobile the changing of refrigerant gas, the amount of the cold-producing medium of contact thermal response switch also changes, thereby the heat dissipation capacity from thermal response switch to cold-producing medium also changes thereupon.In addition, when occuring because of situations such as overload etc. cause that the rotation of motor is restrained, have larger overload electric current to flow through, this moment thermal response switch inside caloric value considerably beyond the heat dissipation capacity by cold-producing medium.In above-mentioned these situations, thermal response plate 8 reaches operating temperature, and its bending direction that reverses cuts off circuit, can prevent the generations such as motor scaling loss.
As mentioned above, the thermal response switch of present embodiment, can move rapidly during in refrigerant superheat or because of abnormal conditions such as overload work generation overcurrent owing to improved heat exchanger effectiveness, cuts off energising.
8 cooling pins are set in the present embodiment only are a kind of concrete execution mode, in fact can reduce as required or increase the quantity of cooling pin.
Below in conjunction with Fig. 3 to Fig. 5, an alternative embodiment of the invention is described.The thermal response switch 21 of present embodiment uses the cooling pin 15 of metal heating panel 25 replacements the first embodiment as radiating part, and heating panel 25 is installed on the outer casing 22 to increase surface area.Therefore, identical with the first embodiment, the contact area of cold-producing medium and thermal response switch increases, and heat exchanger effectiveness is higher.
In addition, in the present embodiment, by using the method such as welding the end face integral body of the tabular heating panel 25 planar portions 22A along outer casing 22 is fixed, improved the intensity of outer casing 22.Therefore, can make planar portions 22A thinner, thereby improve heat conduction efficiency largelyr.
Such as Fig. 4, shown in Figure 5, be provided with 3 heating panels in the present embodiment, this only is a kind of concrete execution mode, in fact can reduce as required or increase the quantity of heating panel.
The present invention can also adopt following execution mode.
Increase the shape of the parts of outer casing surface area, be not limited only to the plate on the pin shown in the embodiment or plane, also can adopt the combination of curved surface or zigzag or these shapes.
In addition, also can carry out on the surface of outer casing so that more groove or the concavo-convex surface area that increases to be set, even not only limiting to outer casing one side such as exasperate processing etc., also can take to increase in cover plate one side the processing of surface area.
The above is preferred embodiment of the present invention only, is not to limit practical range of the present invention; If do not break away from the spirit and scope of the present invention, the present invention is made amendment or is equal to replacement, all should be encompassed in the middle of the protection range of claim of the present invention.
Claims (3)
1. thermal response switch, consist of withstand voltage gas-tight container by metal pressure vessel shell and the cover plate that is weldingly fixed on airtightly on the openend of outer casing, two conducting terminal pins thickly insulate by the electric insulation filler gas respectively and are fixed on two through holes that pass cover plate, be welded and fixed fixed contact on one of them conducting terminal pin, be welded and fixed an end of heater on another conducting terminal pin, the other end of heater is welded and fixed on the cover board
Be connected and fixed to the inner conductive of described gas-tight container the thermal response plate, thermal response plate one end is being welded and fixed travelling contact, and drawing is plate-like near the central authorities, in the temperature jerk counter-rotating of regulation,
Travelling contact is arranged to consist of a pair of switching contact with described fixed contact,
Come Tc by near the distortion thermal response plate fixed part that makes gas-tight container,
The part of heater can fuse during the contact welding, cuts off circuit,
On the gas-tight container inner surface of the electric insulation filler that is fixed wtih the conducting terminal pin, have no to be close to gap and be fixed wtih thermal endurance inorganic insulation parts,
It is characterized in that,
The radiating part that increases its surface area is set on the outer casing surface.
2. thermal response switch according to claim 1 is characterized in that radiating part is metal cooling pin.
3. thermal response switch according to claim 1 is characterized in that radiating part is metal heating panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110219398.4A CN102915875B (en) | 2011-08-02 | 2011-08-02 | Thermal response switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110219398.4A CN102915875B (en) | 2011-08-02 | 2011-08-02 | Thermal response switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102915875A true CN102915875A (en) | 2013-02-06 |
| CN102915875B CN102915875B (en) | 2015-10-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110219398.4A Active CN102915875B (en) | 2011-08-02 | 2011-08-02 | Thermal response switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102915875B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105264628A (en) * | 2013-03-29 | 2016-01-20 | 株式会社生方制作所 | Thermoresponsive switch and method for manufacturing same |
| CN109378250A (en) * | 2018-10-26 | 2019-02-22 | 佛山市欧电器制造厂有限公司 | A kind of band PTC power-off restoration temperature control device shell of good heat dissipation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4970485A (en) * | 1988-11-18 | 1990-11-13 | Sundstrand Data Control, Inc. | Snap action thermal actuator |
| US5121095A (en) * | 1990-02-14 | 1992-06-09 | Susumu Ubukata | Thermally responsive switch |
| US5285183A (en) * | 1992-05-07 | 1994-02-08 | Nihon Seiken Kabushiki Kaisha | Temperature switch |
| JPH08223719A (en) * | 1995-02-14 | 1996-08-30 | Nissin Electric Co Ltd | Gas-insulated switchgear |
| JPH10144189A (en) * | 1996-11-08 | 1998-05-29 | Ubukata Seisakusho:Kk | Thermally-actuated switch |
| CN1269592A (en) * | 1999-04-06 | 2000-10-11 | 株式会社生方制作所 | Thermosesitiee switch |
-
2011
- 2011-08-02 CN CN201110219398.4A patent/CN102915875B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4970485A (en) * | 1988-11-18 | 1990-11-13 | Sundstrand Data Control, Inc. | Snap action thermal actuator |
| US5121095A (en) * | 1990-02-14 | 1992-06-09 | Susumu Ubukata | Thermally responsive switch |
| US5285183A (en) * | 1992-05-07 | 1994-02-08 | Nihon Seiken Kabushiki Kaisha | Temperature switch |
| JPH08223719A (en) * | 1995-02-14 | 1996-08-30 | Nissin Electric Co Ltd | Gas-insulated switchgear |
| JPH10144189A (en) * | 1996-11-08 | 1998-05-29 | Ubukata Seisakusho:Kk | Thermally-actuated switch |
| CN1269592A (en) * | 1999-04-06 | 2000-10-11 | 株式会社生方制作所 | Thermosesitiee switch |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105264628A (en) * | 2013-03-29 | 2016-01-20 | 株式会社生方制作所 | Thermoresponsive switch and method for manufacturing same |
| EP2980824A4 (en) * | 2013-03-29 | 2016-11-30 | Ubukata Ind Co Ltd | Thermoresponsive switch and method for manufacturing same |
| US9972470B2 (en) | 2013-03-29 | 2018-05-15 | Ubukata Industries Co., Ltd | Thermally responsive switch and method of manufacturing same |
| CN109378250A (en) * | 2018-10-26 | 2019-02-22 | 佛山市欧电器制造厂有限公司 | A kind of band PTC power-off restoration temperature control device shell of good heat dissipation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102915875B (en) | 2015-10-07 |
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