JP2569704B2 - Compressor with electromagnetic clutch - Google Patents

Description

The present invention relates to a compressor with an electromagnetic clutch suitable for use in, for example, an automotive air conditioner.

2. Description of the Related Art A compressor of an air conditioner in an automobile is driven by an engine of the automobile, and is provided with an electromagnetic clutch in order to cut off the power.

The structure of a conventional compressor with an electromagnetic clutch will be described with reference to FIG.

In the figure, 100 is a compressor and 200 is an electromagnetic clutch.

The compressor 100 is a housing 1 made of aluminum alloy
The housings 101 and 102 have a plurality of cylinders 103 formed therein. Cylinder 103
A compression chamber 116 is formed therein, and a piston 106 is slidably disposed in the compression chamber 116.

The compression chamber 116 increases or decreases in volume as the piston 106 moves.

A shaft 150 is rotatably supported by the housings 101 and 102 via bearings 140 and 141. Shaft 150
The wave plate 160 is press-fitted in the, and the wave plate 160 rotates integrally with the shaft 150.

On the other hand, the electromagnetic clutch 200 will be described. Reference numeral 201 denotes a drive-side rotor which is rotated by an engine (not shown) via a V-belt, and a stator housing 204 is fitted into the drive-side rotor 201 so as to be relatively rotatable. Have been. Electromagnetic coil 205 in stator housing 204
Has been fixed. The electromagnetic coil 205 is fixed in a recess 207 formed in the stator housing 204.

When the electromagnetic coil 205 is energized, the electromagnetic coil 205 attracts the armature 208 by electromagnetic force, and the armature 2
08 is rotated integrally with the drive-side rotor 201. Therefore, the rotational force of the engine is transmitted to the shaft 150 of the compressor 100.

In the compressor 100, the wave plate 160 rotates integrally with the rotation of the shaft 150, so that the piston 106 reciprocates in the axial direction, thereby increasing or decreasing the volume of the compression chamber 116. Therefore, a pumping action is performed.

The other members in FIG.
It may be the same as the embodiment of the present invention shown in the drawings, and the same members are denoted by the same reference numerals and description thereof will be omitted.

By the way, in general, the electromagnetic clutch 200 is
The magnitude of the transmission torque is determined by the magnitude of the current flowing through the motor. However, the electromagnetic coil 205 has a property of generating heat when energized, and when the temperature rises, the coil resistance increases and the current value decreases. Further, as the ambient temperature increases, the heat radiation property deteriorates, and the current value decreases greatly.

For this reason, usually, in consideration of the heat generation during continuous energization and the rise of the ambient temperature, the setting is made such that a predetermined transmission torque can be exhibited even at a high temperature. However, such a setting causes the electromagnetic coil to have an excessive torque at a low temperature, and therefore has the disadvantage that the electromagnetic coil is increased in size and the number of turns is excessively large.

For this reason, the conventional structure shown in FIG. 4 employs a structure in which the electromagnetic coil 205 is directly welded or integrally fixed to the front housing 120 on the clutch 100 side.

In such a configuration, since the front housing 120 of the compressor 100 constitutes the refrigerant suction chamber 121, it has a property of being cooled by low-temperature, low-pressure refrigerant, and therefore, the electromagnetic coil fixed to the front housing 120 205 was thought to be cooled by a low-temperature refrigerant through the front housing 120.

[Problems to be Solved by the Invention] However, the conventional front housing 120 is divided into an outer diameter side suction chamber 121 and an inner diameter side discharge chamber 122 by a partition wall 125 protruding in the axial direction. It was expected that the front housing 120 would be cooled by the low-temperature refrigerant introduced into the housing.

However, since the high-temperature refrigerant flowing through the discharge chamber 122 on the inner diameter side also directly contacts the front housing 120,
This high temperature is transferred to the front housing 120, and the cooling of the front housing 120 is hindered, and it has been found that the cooling capacity of the electromagnetic coil 205 is not as initially expected.

Further, since the conventional front housing 120 is a cast product integrally formed with the partition wall 125 using an aluminum alloy or low-carbon steel, there is a problem that mass productivity is poor.

In the present invention, it is an object of the present invention to provide a compressor with an electromagnetic clutch in which the cooling capacity of the electromagnetic coil is improved by improving the structure of the front housing and the productivity is also improved.

Means for Solving the Problems According to the present invention, a front housing in a compressor is provided by an outer peripheral wall member forming an outer peripheral wall facing the atmosphere, and a refrigerant disposed between the outer peripheral wall member and the outer peripheral wall member. And a partition wall member that separates the refrigerant suction chamber and the discharge chamber from each other and separates the discharge chamber from the outer peripheral wall member, and that an electromagnetic coil is attached to the outer peripheral wall member. Features.

According to the present invention, the outer peripheral wall member to which the electromagnetic coil is fixed is isolated from the discharge chamber through which the high-temperature refrigerant flows, so that the high-temperature refrigerant does not come into contact with the outer peripheral wall member. , And is effectively cooled by contact with the contact holes, thereby improving the cooling capacity of the electromagnetic coil.

In addition, the outer peripheral wall member can be formed separately from the partition wall member, and can be processed by press working or the like, so that productivity is improved.

[Embodiment] The present invention will be described below based on an embodiment shown in FIGS. 1 and 2.

In the figure, 100 is the compressor, 200 is the compressor 10
This is an electromagnetic clutch connected to one end of the zero.

First, the compressor 100 will be described.
01 and 102 are aluminum alloy housings, in which a plurality of cylinders 103 are formed, and a wave chamber 104 and a suction passage 105 are formed. A piston 106 is slidably disposed in the cylinder 103.

Valve plates 110 and 111 are provided on the end surface of the housing, and the valve plates 110 and 111 are provided with introduction holes 107 and 108, suction holes 112 and 113, and discharge holes 114 and 115 communicating with the suction passage 105. Also cylinder 103
A compression chamber 116 is formed between the inner surface, the end face of the piston 106, and the valve plates 110 and 111.
Increase or decrease the volume with the movement of 106.

Housing 101 and valve plate 110, 111 via
A front housing 1 according to the present invention and a rear housing 130, which may have the same structure as that of the related art, are disposed at positions opposed to 102, respectively. The front housing 1 and the rear housing 130 have low-pressure refrigerant suction chambers 12 respectively.
1, 131 and high-pressure refrigerant discharge chambers 122, 132 are formed. The suction chambers 121 and 131 are connected to the compression chamber through suction holes 112 and 113.
The discharge chambers 122 and 132 communicate with the compression chamber 116 via discharge holes 114 and 115.

The front housing 1 according to the present embodiment includes an outer peripheral wall member 10 forming an outer peripheral wall facing the atmosphere, and a partition wall member 20 housed in the outer peripheral wall member 10. Outer wall member 10
Is formed by press-forming a low-carbon steel plate, and the partition wall member 20 is also formed by press-forming a thin metal plate having a heat insulating layer made of resin, rubber, or the like on the surface.

The outer peripheral wall member 10 and the partition wall member 20 are liquid-tightly joined by mutual laser welding 30 of the outer peripheral portions thereof, and spot welding is performed by spot welding between the overlapping inner side walls.
It is joined by doing. The above spot welding
In order to reduce the contact area between the outer peripheral wall member 10 and the partition wall member 20, one of the portions 31 has, for example, the partition wall member 10.
A welding projection 32 is formed on the outer peripheral wall member 10.

A low pressure, low temperature refrigerant suction chamber 121 is formed between the outer peripheral wall member 10 and the partition wall member 20, and a high pressure, high temperature refrigerant discharge chamber is formed between the partition wall member 20 and the valve plate 110. 122 are formed. Therefore, the outer peripheral wall member 10 is isolated from the discharge chamber 122 so that the heat of the high-temperature refrigerant is not transmitted. 33 is an O-ring.

The rear housing 130 is integrally formed with a partition wall 135 extending in the axial direction. The partition wall 135 divides the inside of the rear housing 130 into the suction chamber 131 and the discharge chamber 132.

Bearings 140 and 141 are provided in the housings 101 and 102, and the shaft 1
50 is rotatably supported. The end face of the shaft 150 projects outside the front housing 120. for that reason,
The valve plate 110 is provided with a shaft sealing device 145,
The leakage of the refrigerant and the lubricating oil to the inside along the shaft 150 is prevented.

The wave plate 160 is press-fitted into the shaft 150, and the wave plate 160 rotates integrally with the shaft 150. Thrust bearings 161 and 162 are provided on both sides of the central cylindrical portion 165 of the wave plate 160,
The bearings 161 and 162 prevent the shaft 150 and the wave plate 160 from being displaced in the axial direction.

The wave plate 160 is formed by bending a plate portion 166 on a disk. Both side surfaces of this wave plate portion are parallel to each other and form a friction surface 167.
Rollers 170, 170 are located at positions where they contact these friction surfaces 167, 167.
These rollers 170 are in contact with the friction surface 167 of the wave plate 160 on one side and in contact with the piston 105 on the other side.

A suction / discharge port 180 is attached to the housing 102. The suction / discharge port 180 has an inlet 181 and an outlet 182 for the refrigerant.

On the other hand, the electromagnetic clutch 200 will be described. A drive-side rotor 201 is rotated by a not-shown engine via a V-belt, and is rotatably supported by a bearing 202. The drive-side rotor 201 has a donut-shaped insertion groove 2.
03 is formed, and the stator housing 204 is fitted into the fitting groove 203 so as to be relatively rotatable. The stator housing 204 is formed by pressing a low-carbon steel plate, and an electromagnetic coil 205 is fixed to the stator housing 204. The electromagnetic coil 205 is fixed by an insulating adhesive 206 such as a synthetic resin, and is fixed in a recess 207 formed in the stator housing 204. The stator housing 204 is fixed to the outer peripheral wall material 10 of the front housing 1 by spot welding.

The shaft 150 of the compressor 100 described above has an end portion penetrating the center of the electromagnetic clutch 200, and an armature 208 is fixed to this end. The armature 208 joins the hub 210 via a cylindrical rubber 209, and this hub 210
Is mounted movably in the axial direction with respect to the shaft 150 by a spline portion 211, and the amount of movement in the axial direction is regulated by the bolt 212. Armature208
Has a disk-shaped yoke 213 attached via a rivet 214.

A gap is formed between the yoke 213 and the driving rotor 201.

 The operation of the compressor having such a configuration will be described.

When the electromagnetic coil 205 is energized, the electromagnetic coil 205 attracts the armature 208 by an electromagnetic force. Therefore, the friction surface of the yoke 213 in the armature 208 is attracted to the friction surface of the rotor 201, and the armature 208 is rotated integrally with the drive-side rotor 201. Therefore, the rotational force of the engine is transmitted to the shaft 150 of the compressor 100.

In the compressor 100, the wave plate 160 rotates integrally with the rotation of the shaft 150. Therefore, the piston 105 is reciprocated in the axial direction, and the volume of the compression chamber 116 is increased or decreased. Therefore, a pumping action is performed.

Due to this pumping action, the refrigerant is drawn into the suction / discharge port body 180.
Is drawn into the interior of the housing from the inlet 181 through the wave chamber 104, the suction passage 105, and the introduction holes 107 and 108, and reaches the suction chambers 121 and 131. The refrigerant in the suction chambers 121 and 131
From 2,113, it enters the compression chamber 116 of the cylinder 103 and is compressed by the piston 106. The refrigerant thus compressed becomes high-pressure and high-temperature discharge refrigerant from the discharge holes 114 and 115 and flows out to the discharge chambers 122 and 132. Further, the fluid is discharged to the outside from an outlet 180 of the suction / discharge port body 180 through a discharge passage (not shown).

According to the configuration of the present embodiment, the outer peripheral wall member 10 in the front housing 1 is isolated from the high-temperature discharge chamber 122 and faces only the low-temperature suction chamber 121, so that the area in contact with the low-temperature refrigerant is large. It will be effectively cooled by the refrigerant.

The partition wall member 20 having the heat insulating layer formed on the surface thereof prevents heat exchange between the refrigerant in the low-temperature suction chamber 121 and the refrigerant in the high-temperature discharge chamber 122, and particularly suppresses a rise in the temperature of the suction refrigerant. In addition, the temperature of the outer peripheral wall member 10 is prevented from rising.

Also, since the projections 32 for the spot welds 31 are formed on the partition wall member 20, the heat of the partition wall member 20, which tends to be relatively hot, is less likely to be conducted to the outer peripheral wall member 10, and The outer peripheral wall member 10 and the partition wall member other than the projection 32
Since a gap 36 is formed between the gaps 20, and a low-temperature suction refrigerant is introduced into the gap 36, the refrigerant performs a heat insulating action to prevent a rise in the temperature of the outer peripheral wall member 10.

For this reason, the electromagnetic coil 205 directly fixed to the outer peripheral wall member 10 is effectively cooled.

Therefore, even if a large current flows through the electromagnetic coil 205, an increase in the coil resistance is suppressed, and the transmission torque is not reduced. That is, the transmission torque generation rate with respect to the supplied voltage value increases. Therefore, an extra coil for compensating for the temperature rise of the coil is not required, and the size can be reduced.

FIG. 2 is a characteristic diagram obtained by examining the effect of the structure of this embodiment. FIG. 2 shows the coil temperature when the ambient temperature is 120 ° C. and continuous DC 12 V is applied, and the coil temperature of the present embodiment is 10 to 15 ° C. in the normal range (middle / high speed range) compared to the conventional case.
To some extent.

The present invention may have a structure of another embodiment as shown in FIG.

That is, in this device, a heat insulating material 40 made of asbestos, a rubber material, or the like is provided in a gap 36 formed between the outer peripheral wall member 10 and the partition wall member 20. It is held by the pressure between the member 10 and the partition wall member 20.

Even in this case, the heat of the partition wall member 20 is
And the cooling effect of the outer peripheral wall member 10 is enhanced.

Further, the present invention is not limited to the wave plate type compressor, and can be applied to a swash plate type compressor and other types of compressors.

[Effects of the Invention] As described above, according to the present invention, since the outer peripheral wall member to which the electromagnetic coil is fixed is isolated from the discharge chamber through which the high-temperature refrigerant flows by the partition wall member disposed inside, the heat of the high-temperature refrigerant is transferred to the outer peripheral wall. The rate of transmission to the members is reduced, and the outer peripheral wall member is cooled by the low-temperature suction refrigerant, so that the cooling effect is enhanced. Therefore, the cooling ability of the electromagnetic coil fixed to the outer peripheral wall member is improved.

Further, the outer peripheral wall member and the partition wall member are formed separately, and press working or the like can be performed respectively, so that workability is improved and productivity is improved.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a sectional view of a compressor with an electromagnetic clutch, FIG. 2 is a characteristic diagram showing a temperature rise of an electromagnetic coil, and FIG. FIG. 4 is a sectional view showing a conventional compressor with an electromagnetic clutch, showing a sectional view of a main part showing another embodiment. 100: Compressor, 200: Clutch, 201: Rotor, 204: Stator housing, 205: Electromagnetic coil,
1 front housing, 10 outer peripheral wall member, 20
Partition wall member, 121: suction chamber, 122: discharge chamber, 40: heat insulating material.

Claims (1)

(57) [Claims] 1. A compressor with an electromagnetic clutch provided at one end of a compressor and transmitting the rotation of a drive source to a rotating shaft of the compressor by the operation of the electromagnetic clutch. An electromagnetic coil of the electromagnetic clutch is fixed to a front housing forming a chamber, wherein the front housing includes an outer peripheral wall member forming an outer peripheral wall facing the atmosphere, and an outer peripheral wall member disposed inside the outer peripheral wall member. And a partition wall member that separates the refrigerant suction chamber and the discharge chamber from each other and separates the discharge chamber from the outer peripheral wall member. A compressor with an electromagnetic clutch, characterized by the installation of