CN102915875B - Thermal response switch - Google Patents
Thermal response switch Download PDFInfo
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- CN102915875B CN102915875B CN201110219398.4A CN201110219398A CN102915875B CN 102915875 B CN102915875 B CN 102915875B CN 201110219398 A CN201110219398 A CN 201110219398A CN 102915875 B CN102915875 B CN 102915875B
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- thermal response
- fixed
- outer casing
- response switch
- tight container
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Abstract
The invention discloses a kind of thermal response switch of coolant compressor.This thermal response switch, by improving the heat conductivity inside and outside gas-tight container, more definitely promptly detects the variations in temperature etc. of cold-producing medium.Thermal response switch of the present invention has the withstand voltage gas-tight container be made up of metal outer casing and cover plate.Cover plate is by metallic plate and run through the conducting terminal pin be fixed thereon airtightly and form.By the peristome of outer casing by all-round surfaces being welded on cover plate such as projection weldings, thus form withstand voltage gas-tight container.By being weldingly fixed on the outer surface of outer casing possibly by the metal cooling pin heat transfer as radiating part, thus when not changing thermal response switch essential structure, add the total surface area of outer casing.
Description
Technical field
The present invention relates to a kind of thermal response switch using bimetal leaf etc., particularly structure is applicable to the thermal response switch of the sealed electrical compressor that air-conditioning etc. uses.
Background technology
All the time, in the cold-producing medium motor compressor that air-conditioning etc. use, employ and prevent motor because of overheated or overcurrent and scaling loss etc. protective device.
Particularly paying attention in reactive situation of abnormal conditions, protective device is arranged in the closed container of sealed electrical compressor, therefore uses the thermal response switch with the withstand voltage gas-tight container of metal.
Patent documentation in the past, such as Japanese Patent No. 2519530 publication, Unexamined Patent 10-144189 publication has disclosed this thermal response switch, and this thermal response switch has the structure such as shown in Fig. 6 and Fig. 7.Thermal response switch 101 forms withstand voltage gas-tight container by metal outer casing 102 and cover plate 103.
Cover plate 103 is made up 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 through through hole 4A, and is insulated airtightly by electric insulation fillers 5 such as glass and be fixed on metallic plate 4.
Outer casing 102 is metal pressure vessels of the domed shape with one end open, thermal response plate 8 is within it installed, the bimetal leaf etc. that this thermal response plate 8 is provided with travelling contact 7 by front end is formed, near central authorities, drawing is plate-like, in the temperature jerk reversion of regulation, described travelling contact 7 is made to contact and depart from aftermentioned fixed contact.The periphery of the metallic plate 4 of cover plate 103 is provided with the circumference 4B thinner than central portion, is welded on this circumference 4B, thus forms withstand voltage gas-tight container by all-round for the peristome of described outer casing 102.By the withstand voltage gas-tight container of metal formed like this, just can be directly used in by the cold-producing medium atmosphere of HTHP compressed.
To be arranged on the gas-tight container medial end of one of them the conducting terminal pin 6A on described cover plate 103, to be welded and fixed the contact 9 that to be relatively fixed with described travelling contact 7.On the gas-tight container medial end of another conducting terminal pin 6B, be welded and fixed one end of heater 10, the other end of heater 10 is weldingly fixed on metallic plate 4.The surface of the electric insulation filler 5 inside gas-tight container, have no the cover 11 being close to pottery system with gap, to increase creepage distance, the flying etc. when simultaneously preventing electric arc from producing is attached on filler.In addition, the electric insulation filling surface outside gas-tight container is coated with the electrical insulating materials such as epoxy resin 12, to obtain sufficient creepage distance.Therefore, even if thermal response switch is miniaturized, sufficient electric insulation distance can also be obtained.The operating temperature of this thermal response switch 101 is by making from outside to be out of shape near the thermal response plate fixed part of gas-tight container to correct.
This thermal response switch 101 is arranged 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. generate heat because of operating current, but, under normal conditions, these heats are flow through the refrigerant suction of surrounding, therefore, 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, or the heating of thermal response switch inside increases to some extent because of overcurrent etc., thermal response plate is made to be heated to more than the temperature of setting, then its bending direction of thermal response board reversal, make travelling contact depart from fixed contact, cut off the energising to motor, that takes precautions against the states of affairs such as scaling loss betides possible trouble.In addition, finally there is contact welding etc. through repetitive operation in thermal response plate, causes carrying out the on-off action between contact, and when excessive continuing current flow passes through, then the part fusing of heater 10, cuts off circuit.
As previously mentioned, thermal response switch in the past can detect overheated or overcurrent and action, but, in recent years, in order to further detect the variations in temperature etc. of cold-producing medium, need the heat exchange performance improving thermal response switch further.Be arranged on the thermal response switch of the closed container inside of sealed electrical compressor, the closed container be made of metal as previously mentioned, therefore higher with the heat exchanger effectiveness of cold-producing medium, but, in order to more definitely promptly detect the change of cold-producing medium, need to improve heat exchanger effectiveness further, improve the reactivity worth that thermal response switch changes environment temperature change or heat dissipation capacity.
Summary of the invention
The object of the invention is when not changing the essential structure of thermal response switch, a kind of compressive resistance that can keep gas-tight container is provided, the heat conductivity inside and outside gas-tight container can be improved again, more definitely promptly detect the thermal response switch of the variations in temperature of cold-producing medium etc.
Thermal response switch of the present invention, by arranging the radiating parts such as metal cooling pin or heating panel on the surface of gas-tight container, increases the surface area of the gas-tight container of thermal response switch.
By increasing the Exposure of gas-tight container and cold-producing medium like this, improve heat exchanger effectiveness, then much less can improve the reactivity worth to refrigerant temperature change, when the flow of cold-producing medium changes, owing to changing 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, by the heating of inside is promptly passed to cold-producing medium, thermal response plate is made to remain on below operating temperature, on the other hand, when refrigerant temperature rises or the flowing of refrigerant gas occurs abnormal, then thermal response plate can be made rapidly to reach operating temperature, cut off energising.
By adopting such hermetic type compressor thermal response switch, the reaction speed to overheated or overcurrent can be improved, obtaining higher protective value.
Accompanying drawing explanation
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.
In accompanying drawing, each label represents:
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 thermal response switch in the past uses same mark, detailed.
Thermal response switch 1 shown in Fig. 1 and Fig. 2 has the withstand voltage gas-tight container be made up of metal outer casing 2 and cover plate 3.Cover plate 3 is made up 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 through through hole 4A, and is insulated airtightly by electric insulation fillers 5 such as glass and be fixed on metallic plate 4.By the peristome of outer casing 2 by the all-round surface being welded on cover plate 3 of the modes such as projection welding, thus form described withstand voltage gas-tight container.
In the present embodiment, by being weldingly fixed on possibly on the outer surface of outer casing 2 by 8 metal cooling pin 15 heat transfer as radiating part, thus when not changing thermal response switch essential structure, the total surface area of outer casing is added.Therefore, be arranged in the closed container of sealed electrical compressor by this thermal response switch, when making it expose in the refrigerant, cold-producing medium flows through between the cooling pin as radiating part, add Exposure, thus improve the heat exchanger effectiveness of thermal response switch 1 and cold-producing medium.
During normal work, although because flowing through the operating current in thermal response switch, the heatings such as thermal response plate 8 and heater 10, this heat is by outer casing 2 and cooling pin 15 to refrigerant loses heat, and therefore, thermal response plate 8 remains on below operating temperature.Therefore, when normally working, thermal response switch is failure to actuate, and the work of motor compressor does not stop.
If when the temperature because of some reason cold-producing medium rises, move tail off from thermal response switch 1 to the heat of cold-producing medium, then the temperature of thermal response switch inside rises.In addition, when the flowing of refrigerant gas changes, the amount of the cold-producing medium of contact thermal response switch also changes, and thus also changes from thermal response switch to the heat dissipation capacity of cold-producing medium thereupon.In addition, because of the situations such as overload etc. causes that the rotation of motor is restrained occur time, have larger overload electric current to flow through, now the caloric value of thermal response switch inside is considerably beyond the heat dissipation capacity by cold-producing medium.In these situations above-mentioned, 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 the present embodiment is owing to improve heat exchanger effectiveness, and in refrigerant superheat or when producing the abnormal conditions such as overcurrent because of overload work, energy action rapidly, cuts off energising.
8 cooling pins are set in the present embodiment and are only a kind of concrete execution mode, in fact can reduce or increase the quantity of cooling pin as required.
Below in conjunction with Fig. 3 to Fig. 5, an alternative embodiment of the invention is described.The thermal response switch 21 of the present embodiment uses metal heating panel 25 to replace the cooling pin 15 of the first embodiment as radiating part, is arranged on by heating panel 25 on 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 methods such as welding to be fixed by overall for the end face of the heating panel 25 of the tabular planar portions 22A along outer casing 22, improve the intensity of outer casing 22.Therefore, planar portions 22A can be made thinner, thus improve heat conduction efficiency larger.
In the present embodiment as shown in Figure 4, Figure 5, be provided with 3 heating panels, this is only a kind of concrete execution mode, in fact can reduce or increase the quantity of heating panel as required.
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 of the pin shown in embodiment or plane, also can adopt the combination of curved surface or zigzag or these shapes.
In addition, also can carry out such as exasperate processing etc. on the surface of outer casing, to arrange more groove or the concavo-convex surface area that increases, even not be only limitted to outer casing side, also can take the processing increasing surface area in cover plate side.
The foregoing is only preferred embodiment of the present invention, be not used for limiting practical range of the present invention; If do not depart from the spirit and scope of the present invention, the present invention is modified or equivalent to replace, in the middle of the protection range that all should be encompassed in the claims in the present invention.
Claims (1)
1. one kind is arranged on the thermal response switch of closed compressor inside, withstand voltage gas-tight container is formed by metal pressure vessel shell and the cover plate be weldingly fixed on airtightly on the openend of outer casing, described pressure vessel shell is long round roof shape, dome top has planar portions, on two conducting terminal pins thickly insulate be fixed on through cover plate two through holes respectively by electric insulation filler gas, one of them conducting terminal pin is welded and fixed fixed contact, another conducting terminal pin is welded and fixed one end of heater, the other end of heater is welded and fixed on the cover board,
Be connected and fixed thermal response plate to the inner conductive of described gas-tight container, thermal response plate one end is welded and fixed travelling contact, and near central authorities, drawing is plate-like, in the temperature jerk reversion of regulation,
Travelling contact is arranged to the opening and closing contact forming a pair with described fixed contact,
Tc is carried out by making to be out of shape near the thermal response plate fixed part of gas-tight container,
During contact welding, a part for heater can fuse, and cuts off circuit,
On the gas-tight container inner surface of electric insulation filler being fixed wtih 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 planar portions on long round roof shape outer casing top is provided with the several pieces of heating panels as radiating part, the end face of described heating panel overall along described planar portions parallel with the long limit of outer casing be welded in described planar portions, to improve the intensity of outer casing, make planar portions thinner; The cold-producing medium that described thermal response switch is arranged on closed compressor inside can flow through the position of 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 CN102915875A (en) | 2013-02-06 |
| CN102915875B true CN102915875B (en) | 2015-10-07 |
Family
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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 |
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| CN (1) | CN102915875B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR112015024568B1 (en) * | 2013-03-29 | 2021-07-06 | Ubukata Industries Co., Ltd | thermo-responsive switch and manufacturing method |
| CN109378250B (en) * | 2018-10-26 | 2020-01-03 | 佛山市欧一电器制造厂有限公司 | Good-heat-dissipation shell with PTC power-off reset temperature control device |
Family Cites Families (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 |
| JP2519560B2 (en) * | 1990-02-14 | 1996-07-31 | 生方 眞哉 | Thermal switch |
| JP2587752B2 (en) * | 1992-05-07 | 1997-03-05 | 日本精研株式会社 | 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 |
| CN1311494C (en) * | 1999-04-06 | 2007-04-18 | 株式会社生方制作所 | Thermosensitive switch |
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2011
- 2011-08-02 CN CN201110219398.4A patent/CN102915875B/en active Active
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| Publication number | Publication date |
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| CN102915875A (en) | 2013-02-06 |
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