JPS5893975A - Rotation detector for compressor - Google Patents

Abstract

PURPOSE:To improve detecting capability for stop of a compressor in such a way that a permanent magnet is arranged at the position corresponding to an eccentric convex part which is provided at the rear end part of a rotary shaft of a compressor, detecting coil is wound around the permanent magnet, while a magnetic polarity at the end part of the magnet on the convex part side is made different from the magnetic polarity which is generated on the convex part side. CONSTITUTION:A roatry shaft 8 of a compressor has its one end protruded out of the housing of the compressor, which is driven in rotation through an electromagnetic clutch by electrically conducting on an electromagnet coil 22. The coil 22 is so wound as allowing the magnetic line of force which is generated on the rotary shaft 8 to be set in NS direction shown in the figure. A convex part 40 is protruded at the other end of the rotary shaft, a permanent magnet 37 is arranged with reverse polarity opposite to it, and further a detecting coil 38 is provided around its periphery. Therefore, when the rotary shaft 8 is turned, an electromotive force is generated in a form of considerable change in the detecting coil 38 in response to access and separation of the convex part 40.

Description

[Detailed Description of the Invention] "Misfire..." mainly relates to a rotation detection device for a compressor for vehicle air conditioning.

In general, the phasing compressor in a vehicle is driven by an independent belt separate from the water pump, alternator, etc., or by a single heald together with the water pump, alternator, etc., but if the latter belt breaks, Other devices have also stopped.1. '), which causes over-1-, etc. In order to stop the compressor early and completely prevent damage to other brass parts, a rotation detector is placed in correspondence with a rotating member such as the rotating shaft of the compressor, and the rotation speed of the same rotating member is detected. A device is already known in which the electromagnetic clutch is treated as a voltage pulse and the OFF signal of the electromagnetic clutch is activated when the rotation stops.

However, since the voltage pulse of the above-mentioned detection device is weak, the detection ability is low, and if a 1ζ amplifier is provided to solve this problem, the structure becomes complicated and the manufacturing and assembly becomes troublesome.

The invention was made in order to eliminate all the above-mentioned defects, and its first purpose is that when the electromagnetic clutch attached to the compressor is turned on, the above-mentioned Focusing on the fact that the clutch coil has enough lines of magnetic force in the same rotation IIq, a permanent magnet is placed corresponding to the rotation locus of the convex part formed on the rear end rim K of this rotating shaft, and By fully winding the detection coil and making the magnetic pole of the magnet described in i3 different from the magnetic pole applied to the convex side of the rotating shaft, the voltage pulse that is applied to the detection coil becomes thicker and the detection ability is improved. It is an object of the present invention to provide a rotation detection device for a compressor that can be easily manufactured and assembled through simple assembly and assembly.

Moreover, the second object of non-invention is, in addition to the structure of the first object of the present invention, that the magnetic body is entirely in series with 1I8 to the convex side end of the permanent magnet.
1[! It is an object of the present invention to provide a rotation detection device for a compressor, which can further increase the voltage pulse generated in the detection coil by increasing the voltage, thereby further improving the detection capability.

Hereinafter, an embodiment of a specific Marumei that achieves the first objective of the misfire Y3I in a vehicular swash plate compressor will be described with reference to FIGS. 1 to 3.

The swash plate compressor shown in FIG. 1 has a new protrusion 40 integrally provided on the rear end surface of the rotating shaft 8 and a detector 64 corresponding to the protrusion 40, and other parts are conventional. This is a known leveling off. Regarding this known part, a front and rear housing 6.7 is connected to both front and rear end surfaces of the center housing 6, which is made up of a pair of opposed cylinder blocks 1.2, through valve plates 4.5, respectively. is bonded and fixed.

A swash plate 9 is attached to a rotating shaft 8 supported at the center of the self-recording center housing 6 and the front housing B.
A double-headed piston 10 fitted into the cylinder bore 6a of the center housing B is capable of full reciprocation. The inside of the front and rear housings 6.7 is divided into a suction chamber 11 located on the outside and a discharge chamber 12 located on the inside.
．． The suction hole 16 and the discharge hole 14 of No. 5 communicate with the cylinder bore 6a, respectively. Each suction hole 16 and discharge hole 14
A suction valve 15 and a discharge valve 16 are provided oppositely to each other, and when the piston 10 reciprocates, a compression operation is performed.

In addition, the swash plate chamber 17 of the center housing 6 has a suction flange (
), and the swash plate chamber 17 is in communication with the communication hole 18
It communicates with the suction chamber 11 via. The discharge chamber 12 is communicated with a discharge flange (as shown) through a communication hole (as shown) provided in the center housing 6.

On the other hand, a Boo'J20 is rotatably supported at a fixed position on the outer periphery of a boss portion 6a integrally formed on the front surface of the front housing B via a radial bearing 19, and is supported by a bell I- (not shown). ll Actively rotated. This pulley 2
An electromagnetic clutch mechanism K is installed between the rotary shaft 8 and the front protrusion of the rotary shaft 8.
A storage case 21 that fits into an annular groove 20a recessed from the rear side is fixed to the inside of the case 21, and a storage case 21 is fitted into the annular groove 20a recessed from the front side of the case 21. ? rBfit! fMl”71a ttrr
r+ −+ , c +ly ry Q J? In other words, the coil 22 and the storage case 21 form an electromagnet.

Furthermore, rotation! A four-shaped collecting plate 24 is fixed to the protruding part of 1IlII8 through a gear 2'6.
An annular driven clutch plate 26 is attached to the outside/211I via an elastic member 25 such as rubber so as to be relatively movable in the rearward direction. A connecting ring 27 is adhesively fixed to the outer periphery of the elastic part 25, and a flange 27+I formed on the rear side of the ring 27 and a driven clutch plate 2 are connected to the flange 27+I formed on the rear side of the ring 27.
6 is a sword and a shimekan by rivet 28.

Therefore, when the coil 22 of the electric magnet is energized, the same electromagnet! ll The driven clutch temporary 26 is attracted to the rear side, and the front of the pulley 20 is opened, that is, the driving clutch plate 20
b, and the rotation of the pulley 2D causes the driven clutch plate 26, the connecting link 27, the elastic member 25, and the mounting plate 2
4 to face the rotating shaft 8. When the clutch is ON, the electromagnetic fill 22 is arranged so as to surround the rotating shaft 8, so lines of magnetic force pass through the rotating shaft 8. The winding direction or energizing direction of the class 1 coil 22 is all set so that the front side of the coaxial 8 is the north pole and the rear side is the south pole.

Next, when the electromagnetic clutch is activated, all the lines of magnetic force passing through the rotating shaft 8 can be used to detect all large voltage pulses]
~ To explain the uninvented rotation detection device, +iU
As shown in FIG.
The opening 31 provided in the valve plate 5 communicates with the insertion hole 62 of the rotating shaft 8 formed in the center of the cylinder block 2 .

Further, a receiving hole 36 communicating with the chamber 29 is provided at the rear of the housing 7, and a detector 64 is installed here.
is fitted airtightly via the 09 tab 35 and removably by the spool ring 66. This detector 64 consists of a permanent magnet 67 buried in the center, a detection coil 38 wrapped around the magnet 67, and a magnetic material or light metal made of a spinning material or light metal so that the coil 38 and the permanent magnet 67 are not completely exposed. The case 69 is integrally molded with metal or the like. The permanent magnet 37 is disposed on the rear side end face of the 111th rotation 41 and aligned with the rotation locus of the protrusion 40 integrally formed at a position eccentric from the center line 4111. The magnetic pole on the Freon 1~ side rotates 11i1 when the electromagnetic clutch K is turned on.
The magnetic pole (eg, N pole) is opposite to the magnetic pole (eg, S gutter) generated on the convex portion 40 side of f18.

Next, the operation and effects of the detection device constructed as described above will be fully explained.

When the electromagnetic clutch K is turned on and the rotating shaft 8 is rotating, the electromagnetic coil 22 causes lines of magnetic force to run inside the rotating shaft 8 in the direction shown by the thick arrow, causing rotation The front side of the 1-cut 8 is the N pole, and the rear side is the S pole.
The convex portion 40 faces the permanent magnet 67 periodically. At this time, the convex portion 40 is the S pole, and the permanent magnet 6
Since the front side of magnet 67 is a north pole, when one person faces the other person as shown in FIG.
When the lines of magnetic force of the high-density box flow toward the sun and, conversely, the two sides separate as shown in FIG.
7, the magnetic flux density passing through the detection coil 68 moves back significantly, and the electromotive force generated in the detection coil 68 increases.

In this way, the embodiment of the specified invention is a rotation detector 6.
Since the output from 4 appears as a pulse signal at a high voltage level, it is less susceptible to noise from other sources, and the detection ability can be completely improved. Furthermore, since the voltage level outputted from the toilet urinal 64 is one level higher, the device can be simplified without amplifying the anus, and the operation and assembly can be easily performed. ′Furthermore, the convex portion d n , l-Eien H
Since it is not necessary to set θ) 1 1 1 5'fy % on the i stone bear, it is advantageous in terms of dimensional accuracy, and from this point as well, manufacturing can be facilitated and costs can be reduced completely. Incidentally, when using the amplifier D1, it is not impossible to reduce its capacity ft'.

By the way, the n-th pulse signal can be converted into a rotational speed signal of the compressor by processing the number of pulses approximately proportional to the rotational speed of the rotating shaft 8 or by detecting the voltage level. This rotational speed signal is used to quickly detect rotational abnormalities such as seizure and activate the electromagnetic clutch.
In order to prevent damage from spreading to other equipment, it is possible to use it as a capacity control signal for the operation of the intake pipe throttle valve, etc.

Next, FIGS. 4 and 5 of the improved invention of the specific invention mentioned above will be explained.

In this embodiment of the improved invention, a magnetic body 41 such as an iron core is disposed so as to face the convex portion 4o of the rotating shaft 8, and an inverted coil 38 is wound around the magnetic body 41. The feature is that the permanent magnet 67 is arranged in full contact with the post-printing surface of the magnetic body 41, but other preemption is almost the same as the embodiment of the ITF specified invention.Therefore, in this improved invention,
When the convex portion 40 faces the magnetic body 41, the magnetic body 41 arranged inside the coil becomes a magnetic path and the permanent magnet 67
High-density lines of magnetic force pass through the magnetic body 41 to the convex portion 4D at θ from the N pole of After that, a portion flows to the end of the surface of the magnetic body 41, flows to the 8 poles of the magnet 67, and only a small amount flows to the convex portion 4o. As a result, the change in magnetic flux density through the coil 38 will be even stronger than in the particular embodiment of the invention, resulting in a larger electromotive force in the coil, which can further improve the overall detection capability.

In addition, the non-invention can also be embodied in the following examples.

(1) In the above embodiment, the N pole appears at νml of the rotating shaft 8, and the 8 poles appear at the rear end, but this can be reversed by changing the direction of the current to the coil 22 and the coil winding direction. The poles may appear J: In this case, the poles of the permanent magnet 37 are also reversed.

(2) Instead of the convex portion 4D of the rotating shaft 8, the concave portion (not shown) should be completely submerged. In this case, the area outside the recess μ becomes a convex portion. In addition, the four parts may be filled with a non-magnetic material, or the convex parts 40 may be filled with non-magnetic material.
A case where a non-magnetic material is fitted around the end face of the rotating shaft 8 is also called a convex part.

(3) In the embodiment of the improved invention, the detection coil 68 is wound on the permanent magnet 3Z side, or on the i+fj side of the magnetic body 41 and the magnet 67.

Although not directly related to the invention, it is also conceivable to allocate a magnetic sensing element, a Hall element, etc. to the n-th convex portion 40 as an approximate rotation detection device.

As detailed above, the invention can improve the rotation detection ability of the compressor, simplify the structure,
It is easy to manufacture and assemble, and is effective in reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a swash plate compressor according to the present invention, FIGS. 2 and 3 are schematic top views for explaining the operating state, and FIG. Figures 4 and 5
Each of the figures is a schematic top view of only the main parts, showing an embodiment embodying the uninvented improved invention. Co-rotating shaft 8, coil 22, detector 64, permanent magnet 37, detection coil 68, mounting case 69, convex portion 40, magnetic body 41
, 0 to the electromagnetic clutch Agent: Patent attorney Hironobu Onda

Claims (1)

[Claims] 1. An electromagnetic clutch is installed on the rotary shaft of the rotating shaft extending outward from the house sink, and when the electromagnetic clutch is turned on, n
1) In a compressor configured to perform compression by driving the rotation l1ilII, the convex portion is completely recessed with respect to the rear end of the rotary shaft rq−+h so as to be eccentric from its central axis. The rotation trajectory of the club and the karachi to Iro Mizuhisa "Full version ft.
L, a detection coil is wound around the same Mizukui stone, and the magnet ik at the end of the convex side of the permanent magnet is connected to the convex side of the rotary shaft by the coil of the electromagnetic clutch MU. A compressor rotation detection device that is completely characterized by having different magnetic poles. 2. In a compressor in which an electromagnetic clutch is installed on the rotary shaft extending toward the housing butt so that the clutch 1d is turned on, the center A convex portion is provided so as to be eccentric from the line, a magnetic body is arranged in accordance with the rotation locus of the convex portion, and a permanent magnet is disposed in full series at the rear end of the magnetic body, and the magnetic body and /or the detection coil is fully wrapped around the permanent magnet,
The rotation detection device for a compressor is further characterized in that the magnetic pole at the end of the permanent magnet on the side of the convex portion is made different from the magnetic pole located on the side of the convex portion of the rotary shaft by the coil of the electromagnetic clutch.