JPH0469729U

JPH0469729U -

Info

Publication number: JPH0469729U
Application number: JP11307490U
Authority: JP
Priority date: 1990-10-30
Filing date: 1990-10-30
Publication date: 1992-06-19

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す全体配置図、
第２図は同じく圧縮機密閉容器下部の断面と制御
器の回路構成を示す詳細図、第３図は同じく信号
の発生状況を示すタイムチヤート図、第４図は同
じく制御器内の信号の流れを示すフローチヤート
図である。１……圧縮機密閉容器、２……凝縮器、３……
キヤピラリチユーブ、４……蒸発器、１０……超
音波センサ、１２……制御器、１３……油、２０
……発振器、２１……コンパレータ、２２……カ
ウンタ、２３……クロツクパルサ、２４……電源
、２５……可変抵抗、２６……固定抵抗、２７…
…演算手段、２８……比較手段、２９……設定手
段、３０……基準ステー、３１……ロータ軸、３
２……油面。 FIG. 1 is an overall layout diagram showing an embodiment of the present invention;
Figure 2 is a detailed diagram showing the cross section of the lower part of the compressor sealed container and the circuit configuration of the controller, Figure 3 is a time chart showing the signal generation status, and Figure 4 is the flow of signals in the controller. It is a flowchart diagram showing. 1... Compressor sealed container, 2... Condenser, 3...
Capillary tube, 4... Evaporator, 10... Ultrasonic sensor, 12... Controller, 13... Oil, 20
...Oscillator, 21...Comparator, 22...Counter, 23...Clock pulser, 24...Power supply, 25...Variable resistor, 26...Fixed resistor, 27...
...Calculating means, 28...Comparing means, 29...Setting means, 30...Reference stay, 31...Rotor shaft, 3
2...Oil level.

Claims

[Scope of utility model registration request]

In a compressor that is equipped with an airtight container and has oil sealed inside the airtight container, a reference stay is provided in the oil in the airtight container and sets a reference height, and the airtight container is located below the reference stay. An externally installed ultrasonic sensor detects the echo of the pulse emitted from the ultrasonic sensor reflected by the reference stay and measures the reflection time _t1 , and the second pulse emitted subsequently is detected. A measurement means for detecting the echo reflected on the oil surface and measuring its reflection time _t2 , and calculating the speed of sound in the oil from the reflection time _t1 measured by the measurement means, and calculating the same sound speed and the reflection time. A calculation means for calculating the oil level height from _t2 , and comparing the oil level height with a reference value,
A protection device for a compressor, comprising a comparison means for stopping operation of the compressor when the value is below a reference value.