JPH0217392Y2 - - Google Patents
Info
- Publication number
- JPH0217392Y2 JPH0217392Y2 JP1981011735U JP1173581U JPH0217392Y2 JP H0217392 Y2 JPH0217392 Y2 JP H0217392Y2 JP 1981011735 U JP1981011735 U JP 1981011735U JP 1173581 U JP1173581 U JP 1173581U JP H0217392 Y2 JPH0217392 Y2 JP H0217392Y2
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- pressure
- compressor
- temperature
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Thermally Actuated Switches (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Description
【考案の詳細な説明】
この考案は、異常高圧と異常高温との双方を検
出して冷房装置を保護するスイツチに関するもの
である。[Detailed Description of the Invention] This invention relates to a switch that protects a cooling device by detecting both abnormally high pressure and abnormally high temperature.
冷房装置において、冷媒の過充填あるいは凝縮
器の汚れ等を原因として冷媒コンプレツサの吐出
圧力が異常上昇すると、冷媒コンプレツサ内のガ
スケツトの吹抜けが起つて圧縮効率が低下し、あ
るいは駆動力が増大してクラツチが滑るようにな
るなどの問題が発生する。また、冷媒量が不足す
ると、冷房能力の減少以外に、冷房サイクルを流
れる潤滑油も減少するので潤滑油不足となり、冷
媒コンプレツサが焼付くなどの問題が発生する。
このため、従来から上記の問題が発生する前に冷
房装置を保護する種々の装置が実用に供されてい
る。このような保護装置を分類すると、冷媒装置
の吐出側の圧力を検出して冷媒ガスを系外へ逃が
す安全弁あるいはコンプレツサ駆動回路を開く圧
力スイツチなどの圧力検出方式と、冷媒装置の吐
出側の温度を検出して冷媒を系外へ逃がす可溶栓
あるいはコンプレツサ駆動回路を開く温度スイツ
チなどの温度検出方式とがある。一般に冷媒圧縮
機における冷媒ガスの状態変化はポリトロープ変
化と考えられ、温度と圧力とには一定の関係があ
り、しかも圧力検出方式と温度検出方式の双方を
設けると価格が上昇するので、どちらか一方を設
けているのが現状である。 In a cooling system, if the discharge pressure of the refrigerant compressor increases abnormally due to overfilling of refrigerant or dirt in the condenser, the gasket in the refrigerant compressor may blow out, reducing compression efficiency or increasing the driving force. Problems such as the clutch becoming slippery occur. Furthermore, when the amount of refrigerant is insufficient, not only does the cooling capacity decrease, but the lubricating oil flowing through the cooling cycle also decreases, resulting in a lubricating oil shortage and problems such as seizure of the refrigerant compressor.
For this reason, various devices have been put into practical use to protect cooling devices before the above problems occur. These protective devices can be classified into pressure detection methods, such as a safety valve that detects the pressure on the discharge side of the refrigerant device and releases refrigerant gas to the outside of the system, or a pressure switch that opens the compressor drive circuit, and a pressure detection method that detects the pressure on the discharge side of the refrigerant device, such as a pressure switch that opens the compressor drive circuit. There are temperature detection methods such as a fusible plug that detects the temperature and releases the refrigerant out of the system, or a temperature switch that opens the compressor drive circuit. In general, changes in the state of refrigerant gas in a refrigerant compressor are considered to be polytropic changes, and there is a certain relationship between temperature and pressure.Moreover, if both a pressure detection method and a temperature detection method are provided, the price will increase, so it is important to know which Currently, only one is provided.
しかしながら、冷媒過多の場合には冷媒コンプ
レツサに吸入される冷媒ガスの圧力が高いし、冷
媒不足の場合には冷媒コンプレツサの摩擦熱が加
えられ、また、特に自動車用のものにあつては環
境の変化により熱の出入が異なることが多いの
で、冷媒コンプレツサの吐出冷媒ガスの温度と圧
力との関係は必ずしも一定ではない。したがつ
て、理想的には温度と圧力との双方を検出して確
実に冷房装置の保護を行なうべきである。 However, when there is too much refrigerant, the pressure of the refrigerant gas sucked into the refrigerant compressor is high, and when there is not enough refrigerant, the frictional heat of the refrigerant compressor is added. Since the input and output of heat often differs due to changes, the relationship between the temperature and pressure of the refrigerant gas discharged from the refrigerant compressor is not necessarily constant. Therefore, ideally, both temperature and pressure should be detected to reliably protect the cooling device.
この考案は、冷媒ガスの異常高温と異常高圧と
を同時に検出できる冷房装置用保護スイツチを提
供することを目的とする。 The object of this invention is to provide a protection switch for a cooling device that can simultaneously detect abnormally high temperature and abnormally high pressure of refrigerant gas.
而して、この考案の要旨は、冷媒コンプレツサ
に取付られ、該冷媒コンプレツサの吐出側の冷媒
ガスの異常高圧を受けると反転する圧力検出部が
設けられたケースと、このケース内に収納され、
直列に接続の温度スイツチと、前記圧力検出部の
反転により開かれる接点機構とより成り、前記冷
媒ガスの異常高温と異常高圧とを検出し、コンプ
レツサ駆動回路を開放させる信号を出力するよう
にしたことにある。 The gist of this invention is to include a case that is attached to a refrigerant compressor and is provided with a pressure detection section that reverses when it receives an abnormally high pressure of refrigerant gas on the discharge side of the refrigerant compressor;
It consists of a temperature switch connected in series and a contact mechanism that is opened by reversing the pressure detection section, and detects abnormally high temperature and abnormally high pressure of the refrigerant gas and outputs a signal to open the compressor drive circuit. There is a particular thing.
したがつて、冷媒ガスの異常高温を温度スイツ
チで、異常高圧を圧力検出部と接点機構とで、そ
れぞれ検出してコンプレツサの駆動を停止させる
ので、冷房装置の保護が確実に図れるものであ
る。 Therefore, the abnormally high temperature of the refrigerant gas is detected by the temperature switch, and the abnormally high pressure is detected by the pressure detector and the contact mechanism, respectively, and the drive of the compressor is stopped, so that the cooling device can be reliably protected.
以下、この考案の実施例を図面により説明す
る。 Examples of this invention will be described below with reference to the drawings.
第１図において、この考案の保護スイツチ１を
取付けた冷媒コンプレツサ２はベーン型のもの
で、シエル３内で図示しない複数のベーンがカム
リング４とサイドブロツク５とり囲まれた圧縮室
６に駆動軸７の半径方向に設けられており、この
駆動軸７の回転により、吸入パイプ８を介して圧
縮室６に吸入された冷媒ガスが圧縮されて吐出室
９を通つて吐出パイプ８から吐出されるものであ
る。 In FIG. 1, the refrigerant compressor 2 to which the protection switch 1 of this invention is attached is of a vane type, and a plurality of vanes (not shown) are installed in a shell 3 to connect a drive shaft to a compression chamber 6 surrounded by a cam ring 4 and a side block 5. The refrigerant gas sucked into the compression chamber 6 through the suction pipe 8 is compressed by the rotation of the drive shaft 7, and is discharged from the discharge pipe 8 through the discharge chamber 9. It is something.
上記冷媒コンプレツサ２の駆動軸７の突出側に
はマグネツトクラツチ１０が設けられており、こ
のマグネツトクラツチ１０のマグネツト１１，１
１が励磁されることにより、該マグネツトクラツ
チ１０と前記駆動軸７とが連結され、駆動軸７に
回転力が与えられる。 A magnetic clutch 10 is provided on the protruding side of the drive shaft 7 of the refrigerant compressor 2.
1 is excited, the magnetic clutch 10 and the drive shaft 7 are connected, and rotational force is applied to the drive shaft 7.
そして、この考案の保護スイツチ１は、冷媒コ
ンプレツサ２の吐出室９の上方で冷媒コンプレツ
サ２のシエル３に形成の孔１２に挿入されている
と共に、該保護スイツチ１と前記シエル３との間
にＯリング１３が介在され、さらにシエル３に螺
合のキヤツプ１４で該保護スイツチ１の上部が押
えられて、冷媒コンプレツサ２に取付けられてい
る。 The protection switch 1 of this invention is inserted into a hole 12 formed in the shell 3 of the refrigerant compressor 2 above the discharge chamber 9 of the refrigerant compressor 2, and between the protection switch 1 and the shell 3. The protection switch 1 is attached to the refrigerant compressor 2 with an O-ring 13 interposed therebetween, and a cap 14 screwed into the shell 3 to press down the upper part of the protection switch 1.
コンプレツサ駆動回路１５は、上記の保護スイ
ツチ１及びマグネツトクラツチ１０のマグネツト
クラツチ１１の他の電源１６、車両スイツチ１
７、エアコンスイツチ１８のすべてが直列に接続
されて構成されている。 The compressor drive circuit 15 includes the protection switch 1 and the other power source 16 of the magnetic clutch 11 of the magnetic clutch 10, and the vehicle switch 1.
7. All of the air conditioner switches 18 are connected in series.
第２図において、この考案の保護スイツチ１の
構造が詳しく示され、例えば合成樹脂から成るケ
ース１９の下端には、圧力検出部２０が設けられ
ており、この圧力検出部２０は、ケース１９と一
体に形成され、他の面よりも肉厚が薄い圧力検出
面２０ａと、皿状に湾曲した反転部材２０ｂとか
ら成り、圧力検出面２０ａに例えば30Kg／cm2の高
圧を受けると、該圧力検出面２０ａからその圧力
が反転部材２０ｂに伝達され、その反転部材２０
ｂが２点鎖線で示すようにケース内側に反転し
て、異常高圧を検出するものである。 In FIG. 2, the structure of the protection switch 1 of this invention is shown in detail. A pressure detection section 20 is provided at the lower end of a case 19 made of, for example, synthetic resin, and this pressure detection section 20 is connected to the case 19. It consists of a pressure detection surface 20a that is integrally formed and has a thinner wall thickness than the other surfaces, and an inversion member 20b that is curved in a dish shape. The pressure is transmitted from the detection surface 20a to the reversing member 20b, and the reversing member 20
b is inverted to the inside of the case as shown by the two-dot chain line to detect abnormally high pressure.
温度スイツチ２１は、内部に可溶合金線を有し
て例えば120℃〜150℃に加熱すると、この可溶合
金線が溶断されるもので、ケース１９内に収納さ
れ、且つケース１９に固定の支持部材２２に支持
されている。そして、この温度スイツチ２１の一
方のリード線２３ａは前記のコンプレツサ駆動回
路１５に接続され、他方のリード線２３ｂは弾性
を有し、下方に突出するように折曲されて構成の
突部２４と、先端に動接点２５とが設けられてい
る。この動接点２５に接触している固定接点２６
は、前記ケース１９の支持部材２２に固定された
リード線２７の一端に形成され、該リード線２７
の他端は前記コンプレツサ駆動回路１５に接続さ
れている。 The temperature switch 21 has a fusible alloy wire inside, and when heated to, for example, 120°C to 150°C, the fusible alloy wire is cut by melting. It is supported by a support member 22. One lead wire 23a of this temperature switch 21 is connected to the compressor drive circuit 15, and the other lead wire 23b has elasticity and is bent to protrude downward to form a protrusion 24. , and a moving contact 25 is provided at the tip. Fixed contact 26 in contact with this moving contact 25
is formed at one end of the lead wire 27 fixed to the support member 22 of the case 19, and the lead wire 27
The other end is connected to the compressor drive circuit 15.
接点機構２８は、上記突部２４、動接点２５及
び固定接点２６とから構成され、前記圧力検出部
２０の反転部材２０ｂが反転すると、突部２４が
上方に押圧されて動接点２５が固定接点２６から
離れ回路を開放するもので、ケース１９内に収納
されて前記温度スイツチ２１とは直列に接続され
ている。 The contact mechanism 28 is composed of the protrusion 24, a moving contact 25, and a fixed contact 26. When the reversing member 20b of the pressure detection section 20 is reversed, the protrusion 24 is pressed upward and the moving contact 25 becomes a fixed contact. 26 to open the circuit, and is housed in a case 19 and connected in series with the temperature switch 21.
尚、この実施例においては、温度スイツチ２１
に可溶式のものを用いたが、他の実施例としてバ
イメタルを用いたもの、あるいはサーミスタ等の
半導体の感熱素子とスイツチング回路を組合せた
もの等を用いることもできることは勿論である。 In addition, in this embodiment, the temperature switch 21
Although a fusible type is used in this embodiment, it is of course possible to use a bimetal type or a combination of a semiconductor heat-sensitive element such as a thermistor and a switching circuit in other embodiments.
上記構成において、冷媒コンプレツサ２の吐出
冷媒ガスの温度が規定温度（例えば120℃）以上
に上昇すると、温度スイツチ２１が切れるので、
コンプレツサ駆動回路１５が開放されてマグネツ
トクラツチ１０のマグネツト１１が無励磁とな
り、冷媒コンプレツサ２の駆動を停止するように
なる。また、冷媒コンプレツサ２の吐出冷媒ガス
の圧力が規定圧力（例えば30Kg／cm2）以上になる
と、圧力検出部２０の反転部材２０ｂが反転し、
接点機構２８が開かれて、温度上昇のときと同様
に冷媒コンプレツサ２の駆動を停止するようにな
る。 In the above configuration, when the temperature of the refrigerant gas discharged from the refrigerant compressor 2 rises above a specified temperature (for example, 120°C), the temperature switch 21 is turned off.
The compressor drive circuit 15 is opened, the magnet 11 of the magnetic clutch 10 is de-energized, and the drive of the refrigerant compressor 2 is stopped. Further, when the pressure of the refrigerant gas discharged from the refrigerant compressor 2 exceeds a specified pressure (for example, 30 Kg/cm 2 ), the reversing member 20b of the pressure detection unit 20 is reversed,
The contact mechanism 28 is opened to stop driving the refrigerant compressor 2 in the same way as when the temperature rises.
冷媒コンプレツサ２の吐出冷媒ガスの温度又は
圧力が規定以上に上昇するということは、冷媒量
が適正でなかつたり、あるいは凝縮器の汚れによ
る冷媒の詰まりなどが起こつたことを意味するか
ら、これらのトラブルとなる原因を除去し、保護
スイツチ１を交換することによつて冷房装置の保
護がなされるものである。 If the temperature or pressure of the refrigerant gas discharged from the refrigerant compressor 2 rises above the specified level, it means that the amount of refrigerant is not appropriate or that the refrigerant is clogged due to dirt in the condenser. The cooling device is protected by removing the cause of the trouble and replacing the protection switch 1.
以上述べたように、この考案によれば、異常高
圧を受けると反転する圧力検出部を設けたケース
に温度スイツチと前記圧力検出部の反転により開
かれる接点機構とを直列に接続して収納して冷房
装置用の保護スイツチを構成したので温度と圧力
とをそれぞれ独立して双方検出することができ、
確実に冷房装置の保護がなされ得ると共に、構成
が冷媒ガスの異常圧力を受けると反転する圧力検
出部が設けられたケース内に圧力検出する接点機
構と、温度スイツチとが設けられ、この温度スイ
ツチは該ケース内にあるためにスペースを増加さ
せないものであるし、また、ケースによつて直接
冷媒ガスと接触せず、気密保持機構を設ける必要
もないものである。 As described above, according to this invention, a temperature switch and a contact mechanism that opens when the pressure detection section is reversed are connected in series and housed in a case provided with a pressure detection section that reverses when abnormally high pressure is applied. Since we have constructed a protection switch for the air conditioner, it is possible to detect both temperature and pressure independently.
In addition to being able to reliably protect the cooling device, a contact mechanism for detecting pressure and a temperature switch are provided in the case, which is provided with a pressure detection part that reverses when the structure receives abnormal pressure of refrigerant gas. Since it is located inside the case, it does not take up any additional space, and since it does not come into direct contact with the refrigerant gas due to the case, there is no need to provide an airtight maintenance mechanism.
第１図はこの考案の保護スイツチを取付けた冷
媒コンプレツサを示す一部切欠きの側面図、第２
図はこの考案の保護スイツチを示す断面図であ
る。
１……保護スイツチ、２……冷媒コンプレツ
サ、１９……ケース、２０……圧力検出部、２１
……温度スイツチ、２８……接点機構。
Figure 1 is a partially cutaway side view showing a refrigerant compressor equipped with the protection switch of this invention;
The figure is a sectional view showing the protection switch of this invention. DESCRIPTION OF SYMBOLS 1... Protection switch, 2... Refrigerant compressor, 19... Case, 20... Pressure detection part, 21
...Temperature switch, 28...Contact mechanism.
Claims (1)
ツサの吐出側の冷媒ガスの異常高圧を受けると反
転する圧力検出部が設けられたケースと、 このケース内に収納され、直列に接続の温度ス
イツチと、前記圧力検出部の反転により開かれる
接点機構とより成り、 前記冷媒ガスの異常高温と異常高圧とを検出
し、コンプレツサ駆動回路を開放させる信号を出
力するようにしたことを特徴とする冷房装置用保
護スイツチ。[Scope of Claim for Utility Model Registration] A case equipped with a pressure detection part that is attached to a refrigerant compressor and that reverses when it receives an abnormally high pressure of refrigerant gas on the discharge side of the refrigerant compressor; It consists of a connected temperature switch and a contact mechanism that is opened by reversing the pressure detection section, and detects abnormally high temperature and abnormally high pressure of the refrigerant gas, and outputs a signal to open the compressor drive circuit. A protective switch for cooling equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981011735U JPH0217392Y2 (en) | 1981-01-30 | 1981-01-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981011735U JPH0217392Y2 (en) | 1981-01-30 | 1981-01-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57124942U JPS57124942U (en) | 1982-08-04 |
| JPH0217392Y2 true JPH0217392Y2 (en) | 1990-05-15 |
Family
ID=29809860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981011735U Expired JPH0217392Y2 (en) | 1981-01-30 | 1981-01-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0217392Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5744469Y2 (en) * | 1978-05-30 | 1982-10-01 |
-
1981
- 1981-01-30 JP JP1981011735U patent/JPH0217392Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57124942U (en) | 1982-08-04 |
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