JPS5974388A - Device for interrupting running of vane rotating type compressor - Google Patents

Abstract

PURPOSE:To enable the operation of an electromagnetic clutch to be stopped instantly by reducing current supply to a field core while fusing a temperature fuse when any abnormalities occur in a compressor. CONSTITUTION:When any abnormalities occur in a compressor, dust is included in a gap between a front side plate 7 and a rear side plate 8 so that a rotor 5 and the slide plates bring about a completely metallic contact condition. As a result, both side plates 7, 8 produce abnormal wear. When the wear develops until an end of an electrode switch 10 contacts the rotor 5, a lot of current flow to the electrode switch 10 in an electric circuit to cut off a temperature fuse 12 so that the operation of an electromagnetic clutch can be stopped instantly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a safety device for a vane rotary compressor that stops the operation of the compressor in the event that an abnormality occurs in the compressor and the compressor is no longer able to operate normally. be.

Conventional structure and its problems In the past, rotary vane compressors used in vehicle air conditioning systems generally obtained driving force solely from the engine via a V-belt, etc., but recently In response to demands for lighter vehicles, lower costs, and smaller engine compartments, a belt-driven structure has been adopted that is combined with other auxiliary equipment such as an alternator and power steering hydraulic pump.

Therefore, in the case of a compressor abnormality, especially a lock phenomenon, a function is required to turn off the electromagnetic clutch of the compressor not only for the refrigeration cycle but also for the safety of the vehicle, and various structures have been adopted.

For example, in a practical example, a pick-up sensor consisting of a permanent magnet and a coil is placed opposite the rotating shaft of a compressor or the armature part of an electromagnetic clutch, and a pick-up sensor is mounted on a metal piece or notch provided on the rotating side. There is a method of extracting the compressor rotation speed as a pulse by utilizing the fact that the magnetic field of the pickup sensor changes depending on distance.

This is because: 1) the cost of processing the rotating shaft is high; 2. There are problems with the sensor life and reliability under high temperature and high vibration conditions.

3. A circuit that compares and calculates the rotation speed of the compressor and the engine is required. It has drawbacks such as:

OBJECTS OF THE INVENTION The present invention solves the drawbacks of the prior art as described in 1-1 above, and aims to provide a compressor operation cut-off device that is low cost, simple, and highly reliable.

Structure of the Invention In order to achieve this object, the present invention utilizes the abnormal wear phenomenon of the side plate near the rotor, which is a form of seizure (lock) that occurs due to the structure of the vane rotary compressor, and applies it to the energizing circuit of the electromagnetic clutch. A 119-digit switch circuit is provided near the rotor on the side plate, and is provided with a temperature fuse and has a voltage ('1ii) connected in parallel with the current-carrying part of the electromagnetic clutch.

With this configuration, when the side plate is abnormally worn, the temperature fuse is cut off by bringing the electrode into contact with the electrode, cutting off the power to the electromagnetic clutch, eliminating the need for a pink amplifier sensor or arithmetic circuit, reducing costs. This is intended to simplify the process2 and improve reliability.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Fig. 2, the electromagnetic clutch includes a field core 1 that is energized, and a field core 1 that is rotated by a compressor.
, L- and an armature 4 integrated with a compressor shirt 1-3. The compressor also includes a perfectly circular rotor 6 integrated with the shaft 3, a cylindrical cylinder 6 that is eccentric to the rotor 5 and partially close to the outer periphery of the rotor 5, and a cylinder 6 that is closed off from both sides. and a front side plate 7 and a rear side plate 8 supporting the shaft 3 with bearings. It consists of a vane 9 disposed on the rotor 6 so as to be freely retractable.

The electrode switch 10 provided on the front side plate 7 is attached at a location close to the rotor 5 with its tip recessed into the front side plate 7 by a minute dimension 11, and is installed in a groove 5 so as to be insulated from the surroundings.

The electrode switch 10 is shown in FIG. When the compressor is in operation, the field core 1 is energized, and the electromagnetic force causes the amateur 4 to
is connected to the pulley 2 (7, compresses the refrigerant by driving the rotor 6 of pressure Di. During normal operation, Suizo Chi 1
0 is an OFF state.

Also, if something happens to the compressor, the rotor 6 will be damaged by the front plate 7. In the gap between the rotor 6 and the rear side plate 8, dirt or the like gets trapped, causing complete metal contact between the rotor 6 and the side plate. As a result, both side plates 7.8 undergo abnormal wear, and when the wear progresses until the tip of the electrode switch 1o comes into contact with the rotor 5, a large amount of current flows to the electrode switch 10 in the electric circuit, causing the temperature fuse 12 As a result, the electromagnetic clutch turns OFF, and the compressor stops operating.

Note that a current fuse may be used instead of the temperature fuse 12.

Effects of the Invention'' Varnish As is clear from the examples, the present invention connects an electrode switch that is energized by contact with the rotor of the compressor in parallel with the field core of the electromagnetic clutch, and connects a temperature fuse in series with the parallel circuit. When a compressor malfunctions, the thermal fuse blows and the current to the field core decreases, so the electromagnetic clutch stops operating instantly.It is extremely reliable and has a simple structure. he,
It has the effect of being inexpensive to produce.

[Brief Description of the Drawings] Fig. 1 is a sectional view of a compressor equipped with an operation cutoff device showing one embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part of Fig. 1,
FIG. 3 is an electrical circuit diagram of the operation cutoff device. 1... Field core, 6... Rotor, 7... Front side plate, 8... Rear side plate, 10
・・・・・・Electrode switch. 11...Minute dimensions, 12...Temperature fuse.

Claims (1)

[Claims] A vane rotary compressor is composed of a cylindrical cylinder, a rotor having a plurality of movable vanes, and side plates that close the cylinder from both sides. An electrode switch is provided with the electrode switch recessed from the surface of the side plate in a microscopic dimension, and this electrode switch is connected in parallel with the energizing circuit of the field core, and this parallel circuit is connected to the power supply via a temperature fuse.
Furthermore, there is an operation cutoff device for the vane rotary compressor, which connects the output shaft of the drive source and the shaft of the rotor via an electromagnetic clutch.