JPS59115494A - Trouble detector for scroll type compressor - Google Patents

Abstract

PURPOSE:To disconnect a clutch in time of perceiving anything unusual in a scroll type compressor as well as to aim at preventing a car from damageable causes, by installing a rotation detector composed of a coiled magnetic body in position toward the kinetic trace of a detected member consisting of a magnetic material which exercises a periodic motion inside a housing. CONSTITUTION:On the outer circumferential surface of a front housing 2, there is provided with a setting hole 2b in order to correspond to a rotation trace on the outer circumferential surface of a balance weight 14 as a detected member exercising a periodic motion, and an iron core 30 as a magnetic body and a detector 27 consisting of a detection coil 31 and a permanent magnet 32 or the like are fitted in this place. An amplifier 34 is connected to the detection coil 31, while a pulse presence detector 35 is connected to this amplifier 34. And, locking happens due to seizuer or binding or the biting of foreign substances whereby a speed of rotation becomes dropped, and when this rotation speed comes to less than the setting value preset in the pulse presence detector 35, an OFF signal is outputted from the detector 35 to a solenoid clutch K, and operation of the compressor is stopped, thus any damage to a car such as clutch breakdown and/or belt snapping can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves eccentrically engaging a spiral portion of a fixed scroll member and a spiral portion of a movable scroll member, and causing the spiral portion of the movable scroll member to revolve to form a spiral portion between the two spiral portions. The present invention relates to an abnormality detection device for a scroll compressor, in which compressed fluid is discharged from the center by moving a closed compression chamber toward the center while reducing the volume.

Conventionally, in a vehicle air conditioner, the driving force of the crankshaft of the engine is transmitted to devices such as a compressor, an alternator, and a fan through the same heald, thereby achieving air conditioning. For this reason, if the compressor rotates abnormally, there is a risk that the bell may slip and be cut off, which may cause a malfunction of the vehicle.

The present invention has been made to eliminate the above-mentioned defects, and its purpose is to quickly disengage the clutch in the event of an abnormality in the scroll compressor to prevent damage to the vehicle such as the bell breaking. An object of the present invention is to provide an abnormality detection device for a scroll compressor.

Hereinafter, a first embodiment embodying the present invention will be described with reference to FIGS. 1-, and a carrier housing knob 3 is integrally provided at the right end of the center housing 1.

A cylindrical host portion 4 is integrally formed in the center of the front housing 2, and a rotating shaft 6 is supported in the center hole 4a by a pair of left and right radial pole hair rings 5, and a drive source is connected at the outer end. connected to. Further, a shaft seal mechanism 7 is interposed between the rotating shaft 6 and the boss portion 40,
A refrigerant gas introduction hole 41) is provided at the upper base end of the host portion 4 so as to communicate with the upper portion of the seal chamber F in which the sole mechanism 7 is housed.

An eccentric shaft 8 is connected to the inner end of the rotating shaft 6,
On this eccentric shaft B, a host portion 91) integrally formed at the center of the back surface of a circular substrate 9a constituting the movable scroll member 9 is rotatable via a radial needle bear link 10 or a link to the brain. I don't support it. A spiral portion 9C is integrally formed on the front side of the movable scroll member 9, as shown in FIG.

On the other hand, the outer circumferential edge of a fixing ring 11 that prevents rotation of the movable scroll member 9 is fitted into a key 12 in an annular locking step formed at the joint between the center housing 1 and the front housing 2, and is engaged with the key 12 so that it cannot rotate. has been done. A suction chamber A is formed on the front housing 2 side with this fixing ring 11 as a boundary, and an operating chamber B is formed on the center housing 1 side. t: Refrigerant gas is introduced from the external circuit through the suction port 2a. Furthermore, as shown in FIG. 2, suction passages 11g are provided at one or more (four in this embodiment, or may have many small holes) locations on the outside of the fixing ring 11, and are actuated from the suction chamber A. Refrigerant gas is introduced into chamber B.

On the back side of the substrate ga of the movable scroll member 9, there is a first plate.
As shown in Figure 2, a guide groove 9 (1) for preventing rotation is carved in the downward direction, and a guide groove 9 (1) for preventing rotation is carved in the front of the fixing ring 11 in the left and right direction as shown in Figure 2. A kite groove 111) for use is carved.

The kite groove 9 (1, as shown in FIG. 3, has a rectangular ring-shaped rotation prevention ring 1J- and a ring 13 that are slidably engaged in the vertical direction, and the kite groove 11 l: As shown in FIG. 2, the rotation prevention ring 13 is engaged so as to be slidable in the left and right direction.

Therefore, when the eccentric shaft 8 is rotated, for example, 90 degrees clockwise in FIG. 2 while drawing a constant circular trajectory by the rotating shaft 6, the rotation prevention ring 13 formed in one piece
is regulated by the guide groove 11N) of the fixed ring 11, so the anti-rotation ring 13 is translated straight to the right along the guide groove 11)), and therefore the guide groove 9d of the substrate 9a is also It is held in the same direction, and self-transmission of the movable scroll member 9 is prevented.

A balance weight 14 made of a magnetic material is fixed to the inner end of the rotating shaft 6 for causing the movable scroll member 9 to revolve 1-11 at Plm.

A fixed scroll member 15 is attached to the stepped portion formed by the center housing 1 and the rear housing 3.
The outer periphery of a circular, thick-walled substrate 15a constituting the substrate 15a is clamped so as to be non-rotatable and non-movable in the radial direction. On the front surface of this substrate 15+L, as shown in FIG.
It is fixed integrally with z so that it is always in local contact with z at two or more places. Further, at approximately the center of the substrate 15i1, there is a discharge chamber J1X capable of discharging compressed refrigerant scum into a discharge chamber formed between the substrate 15a and the rear housing sink 3.
The passage 15 (z is transparent. This discharge passage 15 ()
is closed by a discharge valve 17 whose position is regulated by a retainer 16 within the discharge chamber. A discharge port 3a is transparently provided at the bottom of the discharge chamber.

Therefore, the eccentric shaft 8 causes the spiral portion 9 of the movable scroll member 9 (5 is the spiral portion 15 of the fixed scroll member 15).
1), when it revolves in the clockwise direction in Fig. 4 while locally contacting, the contact portions of both spiral portions 9C1151) move toward the center along the inner circumference of the spiral portion 151), and thus The airtight compression chamber C formed by the two contact parts gradually takes in the refrigerant gas A and J, then moves it to the center 1 and discharges it from the discharge passage 15 into the discharge chamber. The liquid is then pressure-fed from the discharge port 311 to the external circuit.

On the other hand, a pulley 19 is rotatably supported at a fixed position on the outer periphery of a boss portion 4 formed integrally with the front surface of the front housing 2 via a Lanyard bearing 18, and is actively rotated by a belt (not shown). This pulley 19
An electromagnetic clutch I is installed between the front protrusion of the rotation 1 Iql 16 and the front side of the front housing 2 is connected to the inside of the pulley 19 from the rear. A storage case 20 that fits into a recessed annular groove 19a is fixed to the recess 1, a coil 21 is stored in an annular groove 20a recessed from the front side of the case 20, and the coil 21 and storage case 20 constitute an electromagnet. I'm here.

Further, a hub 23 is fixed to the protrusion of the rotation lll1l16 via a key 22, and an annular driven clutch plate 25 is attached to the outer periphery of the hub 23 via an elastic member 24 such as a leaf spring.
is attached so that it can move relative to each other in the front and rear directions. The elastic member 24 is caulked to the huff 23 and the driven clutch plate 25 with studs 26.

Therefore, when the coil 21 of the electromagnet is energized, the driven clutch plate 25 is attracted to the rear side by the electromagnet, and the boot I
Front surface of J19, that is, drive clutch plate 191]
As a result, the rotation of the pulley 19 is transmitted to the rotating shaft 6 via the driven clutch plate 25-1, the elastic member 24, and the hub 23.
transmitted to. When the electromagnetic clutch K is turned on, the electromagnetic coil 21 is arranged so as to surround the rotating shaft 6, so that lines of magnetic force pass through the rotating shaft 6 and the balance weight 14. Rotation 1IIll
The winding direction or current direction of the coil 21 is set so that the front side of I6 is the north pole, and the rear side of the rotating shaft 6, that is, the balance way 1 14 is the south pole.

Next, to explain the abnormality detection device of the present invention, the outer circumferential surface of the front housing 2 communicates with the suction chamber A;
Also, it is arranged so as to correspond to the rotation locus of the outer peripheral surface of the balance ways 1 to 14, which are members to be detected that perform periodic motion.
A hole 21+ is provided in which the rotation detector 27 is placed.
It is fitted airtightly via a ring 28 and removably via a stop ring 29. This detector 27 consists of an iron core 30 as a magnetic material buried in the center, a detection coil 31 wound around the iron core 30, and a permanent It is composed of a magnet 32 and a mounting case 33 integrally molded with a resin material [7] or a light metal material or the like so that the iron core 30, coil 31, and permanent magnet 32 are not exposed. The magnetic pole of the permanent magnet 32 on the balance weight 14 side is connected to the balance weight 14 when the electromagnetic clutch is turned on.・1
4 magnetic pole (e.g., S pole) and the opposite magnetic pole (e.g., N pole)
I'm trying to make it happen.

An amplifier 34 is connected to the detection coil 31, and a pulse presence/absence detector 35 is connected to the amplifier 34. The pulse presence/absence detector 35 outputs an OFF signal to the electromagnetic clutch K when the number of pulses becomes less than a set value.

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

When the electromagnetic clutch K is turned on and the rotating shaft 6 is rotating, magnetic lines of force run inside the rotating shaft 6 due to the electromagnetic coil 21, as shown by the thick arrow in FIG. The front side of the magnet is a north pole, and the balance weight 14 side is a south pole, and the balance weight 14 periodically faces the iron core 3o and the permanent magnet 32. At this time, the balance weight 14 is the S pole, and the inner end of the permanent magnet 32 is the N pole.
Because of the poles, when the two face each other as shown in FIG. 5(a), high-density lines of magnetic force flow from the N pole of the permanent magnet 32 to the balance weight 14 via the iron core 30, as shown by the thick arrow, and vice versa. , when the person leaves the permanent magnet as shown in FIG. The magnetic flux density passing through the detection coil 31 varies significantly depending on whether it is facing the detection coil 32 or not, and an electromotive force is generated in the detection coil 31. Then,
This electromotive force is input to the amplifier 34 as a pulse voltage corresponding to the rotation speed of the compressor, and then the pulse presence/absence detector 35
is input to. Here, when a lock occurs due to seizure of the compression rod or a foreign object is caught, and the rotational speed decreases to below a preset value in the pulse presence/absence detector 35, the detector 35 sends an OFF signal to the electromagnetic clutch K. is output and the compressor operation is stopped.

Now, in the embodiment of the present invention, a rotation detector 27 is provided on the outer periphery of the front housing 2 corresponding to the balance weight 14 magnetized by the electromagnetic clutch K, and the rotation speed of the compressor is detected as a pulse voltage. Since the electromagnetic clutch K is turned off when the number of revolutions falls below a predetermined number, it is possible to quickly stop the rotation in the event of an abnormality in the compressor, thereby preventing damage to the vehicle.

Next, second to sixth embodiments of the present invention will be described with reference to FIGS. 6 to 11.

The second embodiment shown in FIGS. 6 and 7 uses an anti-rotation ring 13 that makes a reciprocating linear motion as a detected member made of a magnetic material that makes a periodic motion, and a rotation detector 27 is mounted on the center housing 1. It is attached to a mounting hole 1a formed through the outer peripheral surface so as to communicate with the working chamber B. When the anti-rotation ring 13 approaches the rotation detector 27,
A voltage pulse is generated in the coil 31 by utilizing changes in the magnetic flux density passing through the iron core 30 when the iron core 30 moves away. The effects of this @2 embodiment are also similar to those of the first embodiment.

In the third embodiment shown in FIG. 8, an iron core 3 embedded and fixed in the outer circumferential direction of a substrate 9a of a movable scroll member 9 that makes a revolution movement is used as a detected member made of a magnetic material that makes a periodic movement.
6 or a permanent magnet 37, and a rotation detector 27 is embedded and fixed in the center housing 1 toward the motion locus of the permanent magnet.

When the movable scroll member 90 substrate 9a approaches or moves away from the rotation detector 27, a voltage pulse is generated from the rotation detector 27, and the effect is the same as that of the first embodiment. Note that the detector 27 of this third embodiment
may also be used as a drain plug.

In the fourth embodiment shown in FIG. 9, a permanent magnet 3 is attached to the outer periphery of a substrate 9a.
8 and further embed temperature-sensitive ferrite 39 there.
Under normal conditions, the temperature-sensitive ferrite 39 acts as a magnetic path, and when the temperature of the temperature-sensitive ferrite 39 increases due to lack of scum or heat due to friction (sliding of the movable and fixed scroll members), the magnetism of the temperature-sensitive ferrite 39 decreases. However, the pulse voltage becomes significantly weaker, and it is determined to be abnormal. In this fourth embodiment, the permanent magnet 38 may be omitted and only the temperature-sensitive ferrite 39 may be used.

In the fifth embodiment shown in FIG. 10, an iron core 40 or a permanent magnet 41 embedded in the end face of a thinly wound portion 9C of a movable scroll member 9 is used as a detected member, and a substrate 15a of a fixed scroll member 15 is used.
A rotation detector 27 in which a detection coil 31 is wound around the outer periphery of a temperature-sensitive ferrite 42 is provided corresponding to the iron core 40 . In this embodiment, the temperature-sensitive ferrite 42 is easily affected by the temperature of the discharged gas in the discharge chamber, and when the humidity of discharged scum is abnormally high due to gas shortage, etc., the temperature-sensitive ferrite 1 is
~ 42 does not lose its magnetism and the pulse becomes extremely weak, so it can be judged as abnormal, and in addition to rotation detection, scrap shortage detection 1 (
It has four functions.

In the sixth embodiment shown in FIG. 11, an iron core 40 or a permanent magnet 41 is embedded in the end face of the spiral portion 9G of the movable scroll, a temperature-sensitive ferrite 43 is fixed through V1 to the substrate 15a of the fixed scroll, and furthermore, the rear housing 3 is It is configured by mounting a detector 27. This embodiment makes it easier to attach the detector 27 and draw out the wire 1 of the coil 31 compared to the fifth embodiment described above. Since the front end surfaces of 43 to 43 may be brought into contact with the iron core 40, the detection accuracy can be improved, but other effects are the same as in the fifth embodiment.

Note that the present invention can also be embodied in the following embodiments.

In each of the above embodiments, as shown in FIG.
A rotation detector 27 having a detection coil 45 wound around the rotation detector 27 is used.

As described above in detail, the present invention has a scroll-type rotation detector installed with a coil wound around a magnetic material toward the locus of movement of a member to be detected made of a magnetic material that performs periodic motion within a housing. This has the effect of quickly disengaging the clutch in the event of an abnormality in the compressor, thereby preventing damage to the vehicle such as damage to the clutch or belt breakage.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the central part showing the first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line X-X of FIG. 1, FIG. 3 is a perspective view of the anti-rotation ring, and FIG. 1 is a cross-sectional view taken along the line Y-Y in FIG. 8 to 11 are sectional views of main parts showing an example, and FIGS. 8 to 11 are sectional views of main parts showing third to sixth embodiments of the invention, respectively.
FIG. 12 is a schematic front view showing a separate rotation detector. Tenta housing 1, front housing 2, rear housing 3, rotating shaft 6, eccentric shaft 8, movable scroll member 9
, fixed ring 11, anti-rotation ring 13, balance way I-14, fixed scroll member 15, coil 21, rotation detector 27, iron core 30, 36, 40, detection coil 31
, 45, permanent magnet 32, 37.3B, 41.44, temperature-sensitive magnet 1-39, 42, 43, electromagnetic clutch K. Patent Applicant Toyota Industries Corporation Representative
Person Patent Attorney On 1) Law No. 121 to Bo Xuan-ku! 1 -570=

Claims (1)

[Claims]] A rotating shaft is positively rotatably supported through the front end surface of the housing at the center thereof, and a movable scroll member is rotatable relative to an eccentric shaft fixed to the inner end of the rotating shaft. A rotation prevention mechanism for the movable scroll member is provided on the inner surface of the housing, and a fixed scroll member is disposed on the rear side of the housing so that the spiral portion of the fixed scroll member and the spiral portion of the movable scroll member are at least The movable scroll member is overlapped in a state of partial contact at two or more places, and while the movable scroll member is revolved on a constant circular trajectory and moved toward the center of the closed compression chamber formed between both spiral portions. causing a volume reduction and performing a unidirectional continuous compression action,
In a scroll type compressor that is disposed through a base plate of a fixed scroll member and discharges air to the outside from a discharge passage,
An abnormality detection device for a scroll compressor, characterized in that a rotation detector having a coil wound around a magnetic material is installed in the direction of the motion locus of a detected member made of a magnetic material that performs periodic motion within a housing. 2. An abnormality detection device for a scroll compressor according to claim 1, wherein the member to be detected is a balance weight that is excited by an electromagnet of the electromagnetic clutch when the electromagnetic clutch is activated. 3. The abnormality detection device for a scroll compressor according to claim 1, wherein the member to be detected is an iron core, a permanent magnet, a temperature-sensitive ferrite, or a permanent magnet and a temperature-sensitive ferrite embedded in the outer periphery of a substrate of a movable scroll member. . 4 The member to be detected is an iron core or a permanent magnet embedded in the end face of the spiral portion of the movable scroll member, and the rotation detector is fixed to the substrate of the fixed scroll member so as to face the orbit of the iron core or the permanent magnet. Detecting an abnormality in a scroll compressor according to claim 1, wherein the detector is constructed by winding a detection coil around a temperature-sensitive ferrite and joining a permanent magnet to the rear end surface of the temperature-sensitive ferrite. Device. 5 The member to be detected is an iron core or a permanent magnet embedded in the end face of the spiral portion of the movable scroll member, and a temperature-sensitive ferrite is penetrated through the substrate of the fixed scroll member corresponding to the orbit of the iron core or permanent magnet. 2. The abnormality detection device for a scroll compressor according to claim 1, wherein the rear housing is provided with a rotation detector facing the same-sensing groove 1-.