JPH0115934Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) This invention relates to a rotary compressor used in a cooling device for an automobile or the like.

(Prior Art) Generally, in a rotary compressor, an electromagnetic clutch is interposed between the drive pulley and the rotor shaft in order to transmit and cut off the rotational force of the drive pulley to the rotor shaft. A coil is used in the clutch, and the input side of this coil is connected to a power source via a control device, and the output side of this coil is connected to a protection means for preventing seizure of the rotary compressor. By the way, since the control device is separated from the coil, it is possible to eliminate length errors that occur when cutting the lead wire connecting the coil and the control device on the control device side, but the protection means is rotary compression. Since it is fixed to the housing of the machine, it is impossible to eliminate the above-mentioned error in the lead wire connecting the coil and the protection means, and as a result, the lead wire connecting the coil and the protection means becomes loose and becomes attached to the drive pulley. May come into contact and be cut off. Therefore,
Preferably, the lead wire connecting the coil and the protection means is arranged so as not to come into contact with the drive pulley.

Conventional rotary compressors of this type include, for example,
Those shown in FIGS. 1, 2, 3, or 4 are known. In the figure, 1 is a housing, a rotor shaft 2 is rotatably supported by the housing 1, and an opening of the housing 1 is covered with a housing cover 3. An armature 5 of an electromagnetic clutch 4 is attached to the rotor shaft 2 protruding from the housing cover 3. 6 is a back plate that houses the coil 7 of the electromagnetic clutch 4, and this back plate 6 is
As shown in Figures 1, 2 and 3, the rotor shaft 2
It is fixed to the housing cover 3 by screws 9 inserted into a number of holes 8 that are approximately equally spaced.
Alternatively, as shown in FIG. 4, a straight pin 1 inserted into a snap spring 10 and a hole 11
2 to the housing cover 3. When the coil 7 is excited, the amateur 5 is
It is in close contact with the rotating drive pulley 13, and the rotational force of the drive pulley 13 is transmitted to the rotor shaft 2 via the armature 5. 14 is a first lead wire, one end of which is connected to the input side of the coil 7, and the other end is connected to a power source (not shown) via a control device (not shown). 15 is a second lead wire, one end of which is connected to the output side of the coil 7, and the other end is connected to a third lead wire 17 via a connector 16. The other end of the third lead wire 17 is connected to a protection means 18 fixed to the housing 1. First lead wire 14
The second lead wire 15 is fixed to the housing cover 3 with a screw 20 via a clip 19 so as not to contact the drive pulley 13.

However, such conventional rotary compressors have the following problems. First, each lead wire 14, 15, 17 has a length error when cut, and the first lead wire 14 and the second lead wire 15 are not in contact with the drive pulley 13, respectively. In order to avoid this, the housing cover 3 is fixed to the housing cover 3 by a screw 20 via a clip 19 after being drawn toward the control device and protection means 18 side. For this reason, clip 1
The second lead wire 15 and the third lead wire 17 between the connector 9 and the connector 16 may become slack. Therefore, when the rotary compressor operates, the second
The lead wire 15 and the third lead wire 17 swing widely together with the connector 16. Moreover, connector 16
has a large inertial mass, so the second lead wire 15 and the third lead wire 17 are subjected to large tension. As a result, there is a problem that the second lead wire 15 or the third lead wire 17 may be cut. In order to solve such problems,
One possible method is to fix the connector 16, which has a large inertial mass, to the housing 1, but when the connector 16 is fixed, the second lead wire 15 loosens due to a length error and comes into contact with the drive pulley 13. There was a problem with it being disconnected.

(Purpose of the invention) This invention was made focusing on the above-mentioned problem, and provides a rotary compressor that can eliminate slack in the lead wire caused by length errors during cutting. The purpose is to

(Structure of the device) To achieve this objective, the device includes a housing, a housing cover that covers an opening in the housing, a rotor shaft rotatably supported by the housing, and a rotor shaft located coaxially with respect to the rotor shaft. a drive pulley rotatably supported by the housing cover; an armature attached to the tip of the rotor shaft and capable of coming into close contact with the drive pulley;
A coil that generates electromagnetic force when energized and brings the armature into close contact with the drive pulley, a back plate that is attached to the housing cover and houses the coil, and a back plate that is attached to the housing and operates when the temperature of the housing is above a predetermined value. a first lead wire having one end connected to the input side of the coil and the other end connected to a power source; one end connected to the output side of the coil and the other end connected to a connector; a second lead wire, and a third lead wire, one end of which is connected to the connector and the other end of which is connected to the protection means.
In a rotary compressor equipped with a lead wire, a long hole extending in the rotational direction of the rotor shaft is formed in the back plate, and the back plate is fixed to the housing cover with screws inserted into the long hole. It is set as.

(Example) Hereinafter, an example of this invention will be described based on the drawings.

5 and 6 are diagrams of a rotary compressor showing a first embodiment of this invention. In the same figure, 26 is a housing having a pump chamber that expands and contracts inside, and the opening of this housing 26 is connected to the housing cover 27.
covered by. A rotor shaft 28 is rotatably supported by the housing 26, and when the rotor shaft 28 rotates, the pump chamber expands and contracts. Reference numeral 29 denotes a drive pulley that is rotationally driven by an automobile engine or the like;
is rotatably supported by the housing cover 27 via a bearing so as to rotate coaxially with the rotor shaft 28. The tip of the rotor shaft 28 protrudes forward from the housing cover 27, and an electromagnetic clutch 30 is attached to the tip.
Amachiyua 31 is installed. 32 is a back plate that houses the coil of the electromagnetic clutch 30, and this back plate 32 includes:
As shown in detail in FIG. 6, a plurality of elongated holes 33 are formed approximately equally spaced with respect to the rotor shaft 28. Each long hole 33 extends a predetermined distance in the rotational direction of the rotor shaft 28. Numeral 35 is a screw that fixes the back plate 32 to the housing cover 27. The body of each screw 35 is loosely inserted into the elongated hole 33, and the tip end is screwed into the housing cover 27. The coil generates electromagnetic force when energized, and can bring the armature 31 into close contact with the drive pulley 29. 37 is a protection means for preventing seizure of the rotary compressor, this protection means 37 is fixed to the housing 26, and is activated when the temperature of the housing 26 is above a predetermined value,
The current to the coil is cut off. One end of a first lead wire 38 is connected to the input side of the coil, and the other end of the first lead wire 38 is connected to a grounded power source (not shown) via a control device (not shown). ing. A second lead wire 3 is connected to the output side of the coil.
One end of the second lead wire 39 is connected to the connector 40, and the other end of the second lead wire 39 is connected to the connector 40. One end of a third lead wire 41 is connected to the connector 40, and the other end of the third lead wire 41 is connected to the input side of the protection means 37. The output side of the protection means 37 is grounded. The connector 40 is attached to a clip 44 by a screw 43.
It is fixed to the housing 26 via.

Next, the operation of the first embodiment of this invention will be explained.

First, the connector 40 is fixed to the housing 26 with a screw 43 via a clip 44.
At this time, the second lead wire 39 may become slack due to a length error when it is cut. Next, each screw 35 is slightly loosened, and the back plate 32 is connected to the connector 40 at the connection portion between the first lead wire 38 and the second lead wire 39 and the coil.
The rotor shaft 28 is rotated in a direction away from the rotor shaft 28. At this time, since each long hole 33 extends in the rotation direction of the rotor shaft 28,
The back plate 32 can be easily rotated around the rotor shaft 28 while the long hole 33 is guided by the screw 35. Moreover, since the back plate 32 is rotated in a direction in which the connecting portion is separated from the connector 40, the second lead wire 3
The slack in No. 9 is completely eliminated. Next, each screw 3
5 to fix the back plate 32 to the housing 26. In this way, the second lead wire 39
Since the slack is completely eliminated, the second lead wire 39 does not come into contact with the drive pulley 29, and as a result, the second lead wire 39 is prevented from being cut by the drive pulley 29. Furthermore, since the connector 40, which has a large inertial mass, is fixed to the housing 26, it does not swing. Therefore,
The second lead wire 39 and the third lead wire 41 are no longer subjected to tension by the connector 40,
As a result, the second lead wire 39 and the third lead wire 41 are also prevented from being cut due to tension.

FIG. 7 is a sectional view of the front side of a rotary compressor showing a second embodiment of this invention. Incidentally, the same parts as those in the first embodiment are given the same reference numerals, and the explanation thereof will be omitted. In the same figure, reference numeral 51 denotes a back plate that houses the coil 52.
It is supported by 3. A long hole 54 is formed in the back plate 51 and extends a predetermined distance in the rotational direction of the rotor shaft 28. The body of a screw 35 is loosely inserted into this elongated hole 54, and this screw 35 is inserted into the housing cover 27.
By being screwed into the back plate 51
is fixed to the housing cover 27. 55 is a bearing interposed between the drive pulley 29 and the housing cover 27, and 56 is a bolt that fixes the armature 31 to the rotor shaft 28. In this embodiment, the back plate 51 is attached to the housing cover 27 with a snap spring 53 and one screw 3.
5, there is only one elongated hole 54. Therefore, the effect of reducing the cost by reducing the number of man-hours required for machining the elongated hole 54 can be achieved. The rotary compressor of this invention is of vane type, swash plate type,
It can be used for types such as piston type, scroll type, screw type, and Wankel type.

(Effects of the invention) As explained above, according to this invention, a long hole extending in the rotational direction of the rotor shaft is formed in the back plate, and screws inserted into the long hole connect the back plate to the housing. Since it is fixed to the cover, the second lead wire is prevented from being cut due to contact with the drive pulley, and furthermore, the second lead wire and the third lead wire are prevented from being cut due to the tension generated by the deflection of the connector. This has the effect that cutting is prevented.

[Brief explanation of the drawing]

Figure 1 is a side view showing a first example of a conventional rotary compressor, Figure 2 is a cross-sectional side view of a back plate used in the first example, and Figure 3 is a view taken in the direction of the - arrow in Figure 2. , FIG. 4 is a sectional side view showing a second example of a conventional rotary compressor, FIG. 5 is a side view showing a first embodiment of the rotary compressor according to this invention, and FIG. 6 is a side view showing the first embodiment of the rotary compressor according to the invention. FIG. 7 is a sectional side view showing a second embodiment of the rotary compressor according to this invention. 26... Housing, 27... Housing cover, 28... Rotor shaft, 29... Drive pulley, 31... Armature, 32, 51... Back plate, 33, 54... Long hole, 35... Screw,
37... Protective means, 38... First lead wire, 39
...Second lead wire, 40...Connector, 41...
Third lead wire, 52...coil.

Claims (1)

[Scope of utility model registration request] a housing; a housing cover that covers an opening of the housing; a rotor shaft rotatably supported by the housing; a drive pulley located coaxially with the rotor shaft and rotatably supported by the housing cover; An armature that is attached to the tip and can be brought into close contact with the drive pulley, a coil that generates electromagnetic force when energized and brings the armature in close contact with the drive pulley, a back plate that is attached to the housing cover and that houses the coil, and a housing. a protective means that is attached to the housing and operates when the temperature of the housing exceeds a predetermined value to cut off current to the coil;
A first lead wire has one end connected to the input side of the coil and the other end connected to the power supply, a second lead wire has one end connected to the output side of the coil and the other end connected to the connector, and a second lead wire has one end connected to the connector and the other end connected to the connector. A rotary compressor comprising a third lead wire whose end is connected to the protection means, in which a long hole extending in the rotational direction of the rotor shaft is formed in the back plate, and a screw inserted into the long hole is inserted into the rotary compressor. A rotary compressor characterized by a back plate fixed to a housing cover.