JPS60178985A - Compressor having rotation detecting function - Google Patents

Abstract

PURPOSE:To detect the rotation of compressor easily by providing a magnetic pickup while facing with the rotary locus of asymmetric rotary body and detecting the magnetic flux leaked from an electromagnetic clutch through spindle to said rotary body. CONSTITUTION:A radially projecting section 81 is provided on the outercircumference of a cam rotor 8 and a magnetic pickup 7 is provided at the position corresponding with said projection while considering the cam rotor 8 as an asymmetric rotary body. The leakage flux from an electromagnetic clutch constructed with a clutch rotor 31, an electromagnet 32 and a clutch armature plate 33 secured on the outer face of a sleeve 14 of a front end plate 11 is detected by said magnetic pickup for the purpose to detect the rotation of compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a compressor for a car air conditioner having a function of detecting two rotational speeds.

[Prior art]

Generally, when a car air conditioner compressor stops due to seizure or other causes, it is necessary to quickly turn off the connection between the drive source (engine) and the compressor to prevent damage to the drive elements.

In particular, if a belt called a pneumatic belt, which has recently started to be used, is used to drive not only the compressor but also other devices such as an alternator, it can cause damage to the compressor.

Is it necessary to turn off the electromagnetic clutch so that it does not affect the operation of other devices? For this reason.

A compressor is usually provided with a sensor for detecting the rotation speed of the compressor.

Conventionally, various types of rotation sensors for one rotating body are known, such as one mechanical type, two generation type, and electromagnetic induction type.
In both cases, it was located in front of the clutch for rotating the compressor, so in addition to the space to house the compressor.

A space is required to store the sensor, and in the case of an automobile air conditioner, installation space is limited, making it difficult to install the sensor.

[Purpose of the invention]

An object of the present invention is to provide a compressor that can detect the rotational speed even when there is only space to install the compressor by incorporating a sensor into the compressor.

The clutch selectively transmits the rotational force of an external drive source to the main shaft to perform compression operation.

and a compressor including an asymmetric rotor connected to the main shaft in the casing, wherein a magnetic pickup is fixedly supported on the casing so as to face the rotation locus of the asymmetric rotor, and the magnetic pickup is connected to the main shaft from the electromagnetic clutch. The compressor is characterized in that the magnetic flux leaking oil to the asymmetric rotor through the magnetic pickup is detected by the magnetic pickup and the rotation speed of the compressor is detected.

〔Example〕

The present invention will be described below based on two embodiments shown in the drawings.

Referring to FIG. 1, the compressor shown in FIG. 1 has a compressor housing 1 consisting of a front end plate 11 and a cup-shaped portion 12 installed therein, and the front end plate 11 has one through hole. 111 is completely formed, and the main shaft 2 is inserted through this through hole 111. Main shaft 2
A disc rotor 21 is fixed to the inner end of the disc rotor 21, and the disc rotor 21 has a ball bearing 13 in the through hole 111.
It is rotatably supported by.

The front end plate 11 has a sleeve 14 extending forward so as to surround the main shaft 2.

A ball bearing 15 is installed at the front end inside the sleeve 14.9. The main shaft 2 is rotatably supported.

On the outer surface of the spacer 'J-7' 14, a clutch rotor 31 is rotatably supported by a bearing 16, and an electromagnet 32 is fixed. On the other hand, a clutch armature plate 33 is elastically supported on the end of the main shaft 2 protruding from the sleeve 14. That is, Tarafuchi rotor 31. The electromagnet 32 and clutch armature plate 33 constitute an electromagnetic clutch. Rotation from an external drive source (for example, an automobile engine) is transmitted to the main shaft 2 by this electromagnetic clutch.

Specifically, the rotation of an external drive source is transmitted to the clutch rotor 31 via a belt or the like, and by energizing the electromagnet 32,
Franchise armature 1/33 to clutch rotor 3
Rotational force is transmitted to the main shaft 2 by adsorption to the main shaft 1.

In the cup-shaped portion 12 whose opening is closed by the front end plate 11, a movable scroll member 24 is mounted on a drive wheel 22 eccentrically connected to the inner end surface of the disc rotor 21 via a radial bearing 2;
or rotatably supported. Furthermore, the fixed scroll member 2 is engaged with the movable scroll member 24.
5 is provided.

Both ends of the fixed scroll portion are fixed to the cup-shaped portion 12 mentioned above. In addition, the front end plate 11-
\A fixed ring 112 and a movable ring 1 fixed to the side plate of the movable scroll 24 to face it
13 and the balls 1]4 arranged in ball receiving holes formed in the first ring constitute a rotation prevention mechanism for preventing rotation of the movable scroll member.

The fluid that entered from the suction hole 4 is taken into the closed space formed by the movable scroll member 24 and the fixed scroll member 5, moves to the center while being compressed by the revolution of each movable scroll member, and is transferred to the discharge port 51. From discharge chamber 5
is discharged.

Furthermore, it is designed to be circulated through a discharge port 6.

Furthermore, according to FIG. 1, a semi-disc-shaped counterweight 26 formed of a magnetic material is mounted on the shaft between the tissue floater 21 and the drive wheel 22, facing downward in the figure. A magnetic pickup 7 is provided in the front end plate 11 so as to face the tip of the counterweight 26.

Here, the structure of the above magnetic pickup 7 will be explained with reference also to FIG. As shown in FIG. 2, the magnetic pickup 7 has a core 72 with an iron core 7 inserted in its center, a winding 73, and an epoxy resin 7.
It is molded with 4. Then, it is inserted into a through hole previously provided in the front end plate 11 in the direction shown by the arrow in FIG. The tip of the iron core 71 is shaped so as to be flush with the inner surface of the front end plate 11 when the magnetic pickup 7 is inserted into the front end plate 11.

Here, with reference to FIGS. 1 and 6, the function of detecting the rotation speed of a scroll compressor using the present invention will be explained.

When the electromagnet 32 is energized, the main shaft 2 is magnetized by leakage magnetic flux from the electromagnet 32.

Subsequently, the semicircular plate-shaped counterweight 26 described above is also magnetized. The semi-disc-shaped counterweight 26 moves according to the rotation of the drive wheel 22, but since the drive wheel 22 is eccentrically attached to the main shaft 2 as described above, the movement of the semi-disc-shaped counterweight 26 is caused by the rotation of the drive wheel 22. In FIG. 6, it is rotating around the axis path of the main shaft 2.

Here, the magnetic flux (φ) penetrating the magnetic pickup 7 is.

Since the semi-disc counterweight 26 is magnetized, as shown in FIG. Large, otherwise small. Therefore, the magnetic flux passing through the magnetic pickup 7 changes due to the rotation of the semicircular counterweight 26, and a voltage expressed by the following equation (1) is generated in the magnetic pickup 7 due to electromagnetic induction.

A semicircular counterweight 26 shown in FIG.

When rotating vc in the direction of the arrow in the figure (clockwise).

At point A', the magnetic flux (φ) passing through the magnetic pink-up 7 decreases, so a positive voltage is generated in the magnetic pickup 7 from equation (1). Similarly, a negative voltage is generated at point A. Therefore, each time the semicircular plate-shaped counterweight 26 rotates once, a voltage of 1 positive and negative pulse is generated in the magnetic pickup 7, as shown in FIG. 4. Therefore, each pulse number must be measured. For example, the rotation speed of the compressor can be detected.

Furthermore, in FIG. 5, the cam rotor 8 whose one end surface is inclined is rotated by the rotation of the main shaft 2.

A so-called oscillating compressor is shown in which a piston 10 is reciprocated by the oscillation of a oscillating plate 9 provided on the inclined surface of the cam rotor 8.

In such an oscillating compressor, as shown in the figure, a protrusion 81 is provided on the outer periphery of the cam rotor that protrudes in the radial direction, that is, the cam rotor 8 is made into an asymmetric rotating body, and a magnetic pink-up is provided corresponding to the protrusion. If provided, Tarafuchi rotor 3
1. The leakage magnetic flux from the electromagnetic clutch constituted by the electromagnet 32 and the Taranochi armature plate 33 can be detected using this magnetic pickup in the same manner as in the above case.

[Invention effect]

As explained above, according to the present invention, the main shaft of the compressor is provided with an asymmetric rotating body that is substantially magnetized by the electromagnetic clutch of the compressor, and the rotation locus of the asymmetric rotating body is At opposing positions, there are magnetic pickups provided in the compressor housing. By moving the asymmetric rotating body and the magnetic pickup substantially closer to each other, the magnetic flux that cuts the magnetic pickup is changed.

By detecting the voltage generated in the magnetic pickup, the sensor does not take up space unlike conventional sensors, and it is not only easy to install in cars, etc.
Since the output voltage from the above-mentioned magnetic pink-up changes depending on the rotation of the main shaft, the rotation speed of the compressor can be detected almost accurately.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the compressor according to the present invention as a scroll type compressor, and FIG. 2 is a sectional view showing a magnetic big amplifier used in the present invention. FIG. 3 is a diagram for explaining the electromagnetic induction effect according to the present invention, FIG. 4 is a diagram showing the voltage induced in the magnetic pink-up in FIG. 6, and FIG. 5 is another embodiment of the compressor according to the present invention. FIG. 2 is a sectional view showing an example of an oscillating compressor. DESCRIPTION OF SYMBOLS 1... Compressor housing, 2... Main shaft, 4... Suction port, 5... Discharge chamber, 6... Discharge port, 7... Magnetic pickup, 8... Cam rotor, 9... Rocking plate, 10
···piston. Figure 4, Eng.

Claims (1)

[Claims] 1. An electromagnetic clutch mounted on the compressor housing selectively transmits the rotational force of an external drive source to the main shaft to perform compression operation, and the main shaft is connected to the main shaft in the housing. In a compressor equipped with connected asymmetric rotors, a magnetic pickup is fixedly supported on the housing so as to face the rotation locus of the asymmetric rotors, and the magnetic pickup is connected to the asymmetric rotors from the electromagnetic clutch via the main shaft. A compressor characterized in that the number of revolutions of the compressor is detected by detecting leaking magnetic flux using the magnetic pink-up. 2. The first aspect of the present invention is characterized in that the asymmetric rotating body is a counterweight connected perpendicularly to the main axis of the compressor for balancing inertial force.
A compressor having a rotation speed detection function as described in Section 2. 3. The compressor having a rotation speed detection function according to claim 2, wherein the compressor is a scroll type compressor. 4. The compressor having a rotation speed detection function according to claim 1, wherein the compressor is a oscillator, and a cam rotor is used as the asymmetric rotating body.