JP2002106485A - Motor type scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool a compressed gas and a motor part by increasing the mass flow rate of the compressed gas and using a single cooling chamber provided on the outer periphery of the motor part. SOLUTION: A motor type scroll compressor comprises a housing 1, a fixed scroll 21 fixed to the housing 1, a revolving scroll 31 which is provided eccentrically to the fixed scroll 21 and orbits along it, and the motor part 5 installed in the housing 1 to drive the revolving scroll 31. This housing 1 is characterized by having the cooling chamber 26 which is provided adjacently to the outer periphery side of the motor part 5 and in which a cooling fluid is supplied, and a high pressure chamber 25 which is provided adjacently to the outer periphery side of the cooling chamber 26 and in which the gas compressed by the scrolls 21 and 31 is supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll compressor,
More specifically, the present invention relates to a motor-integrated scroll compressor that compresses gas supplied to a fuel cell.

[0002]

2. Description of the Related Art In recent years, in the automobile industry, demand for petroleum resources has increased expectations for electric vehicles. Fuel cells as driving sources for electric vehicles have high energy conversion efficiency and are environmentally friendly with only harmless products such as water and carbon dioxide, so that demand is expected to increase in the future. As a compressor for compressing gas supplied to the fuel cell, a scroll compressor that can be reduced in size and weight is suitable.

Further, since it is preferable that the work amount of the scroll compressor is small, a cooling chamber for circulating cooling water around a high-pressure chamber, such as a scroll compressor described in Japanese Patent Application Laid-Open No. H8-247056, is used. The method of installing and suppressing the temperature rise of the high-pressure air has been adopted.

FIG. 2 shows an axial sectional view of a conventional scroll compressor. A housing 1 of a conventional compressor includes a front casing 2 having a concave portion on a small-diameter side end face, an end plate 20 installed on the small-diameter side end face of the front casing 2, and a large-diameter end of the front casing 2. And a rear casing 3 installed.

On the large diameter side of the front casing 2, a fixed scroll 21 is formed in the axial direction. Further, a suction portion 22 is formed on the outer peripheral side of the fixed scroll 21 and a discharge portion 23 is formed on the inner peripheral side. A discharge valve 24 and a high-pressure chamber 25 are formed in front of the discharge section 23. A crank-shaped drive shaft 30 is provided at the small-diameter end of the rear casing 3.
Is rotatably arranged at one end. At the other end of the drive shaft 30, a revolving plate 32 having a revolving scroll 31 formed in the axial direction is rotatably disposed.

When the drive shaft 30 rotates and the orbiting scroll 31 orbits, the fixed scroll 21 and the orbiting scroll 31 are rotated.
Since the space between the two moves toward the discharge unit 23 while being compressed, the air forming the space is gradually compressed. The air that has reached the discharge part 23 is discharged from the discharge port 20a to the outside of the compressor via the discharge valve 24 and the high-pressure chamber 25.

The cooling water flows into the cooling chamber 26 from a cooling water inlet (not shown). The cooling chamber 26 is adjacent to the high-pressure chamber 25. Therefore, the temperature of the cooling water rises due to heat transfer from the high-pressure air in the high-pressure chamber. The heated cooling water flows out of the compressor from a cooling water outlet (not shown). In the conventional scroll compressor, the high-pressure air as the discharge gas is cooled as described above.

On the other hand, this scroll compressor requires a motor or the like as a driving means separately. According to the motor-integrated scroll compressor in which the compressor and the motor are integrated, it is possible to reduce the size of the entire compression system including the motor.
For this reason, a scroll compressor integrated with a motor is particularly suitable as a compressor for gas supplied from a fuel cell, which has many space restrictions. In a motor-integrated scroll compressor,
It is necessary to remove the heat generated from the rotor rotating at a high speed in the motor section as well. For this reason, conventionally, a cooling unit such as a fan is provided in the motor unit separately from the cooling chamber for cooling the high-pressure air.

[0009]

The gas supplied to the fuel cell, that is, the discharge gas of the compressor, needs to be humidified to some extent. For this reason, a steam exchange membrane for humidifying the discharge gas is installed near the discharge port of the compressor section. The heat-resistant temperature of this steam exchange membrane is about 140 ° C. Therefore, it is necessary to keep the temperature of the discharge gas below this temperature. Only from the viewpoint of cooling the discharge gas,
It is also conceivable to use a compressor having a conventional cooling chamber for a fuel cell.

However, when a conventional motor-integrated scroll compressor is used for a fuel cell, there are the following problems. The gas supplied to the fuel cell, that is, the discharge gas of the compressor, is preferably large in mass flow rate because the mass of gas supplied to the cell increases. However, since the cooling chamber of the conventional scroll compressor is formed on the end face of the front casing, the gas sucked into the compressor from the outer peripheral side of the end face may be heated by the cooling water after the heat exchange. .

[0011] As the intake gas is warmed and the volume increases, the density decreases, but the volume flow is constant. For this reason, the mass flow rate of the suction gas decreases, and the mass flow rate of the discharge gas necessarily decreases. That is, in the conventional compressor in which the cooling chamber is formed on the end face, the gas mass supplied to the battery is reduced.

Further, as described above, the conventional motor-integrated scroll compressor is provided with cooling means for the motor section and cooling means (cooling chamber) for high-pressure air separately.

The present inventor has provided a high-pressure chamber to which the compressed discharge gas is supplied on the motor side of the housing, and provided only one cooling chamber as cooling means adjacent to the high-pressure chamber and the motor section. , Suppressing the decrease in the mass flow rate of the discharge gas,
Further, it has been found that cooling of the discharge gas and cooling of the motor unit can be performed by a single cooling unit.

The motor-integrated scroll compressor of the present invention has been completed on the basis of the above-mentioned knowledge, and prevents the mass flow rate of the discharge gas from being reduced. The task is to perform in a room.

[0015]

SUMMARY OF THE INVENTION In order to solve the above problems, a motor-integrated scroll compressor according to the present invention is provided with a housing, a fixed scroll fixed to the housing, and eccentrically mounted in the housing within the housing. And a motor-integrated scroll compressor having an orbiting scroll for orbiting along the fixed scroll, and a motor installed in the housing to drive the orbiting scroll, wherein the housing has an outer periphery of the motor. A cooling chamber provided adjacent to the side and supplied with a cooling fluid, and a high-pressure chamber provided adjacent to the outer peripheral side of the cooling chamber and supplied with the compressed gas compressed by the fixed scroll and the orbiting scroll. It is characterized by having.

That is, in the motor-integrated scroll compressor according to the present invention, the high-pressure chamber to which the compressed gas is supplied is provided on the outer peripheral side of the motor section, and the cooling chamber to which the cooling fluid is supplied is the inner periphery of the high-pressure chamber. It is characterized by being installed on the side. That is,
In the radial direction of the motor, a motor unit, a cooling chamber, and a high-pressure chamber are installed in a ring shape from the inner peripheral side.

In the compressor of the present invention, the high-pressure chamber and the cooling chamber are provided on the outer peripheral side of the motor section, and the gas suction port is provided on the compressor section side. There is no possibility that the gas sucked into the compressor unit is heated by the working fluid. For this reason, a decrease in the mass flow rate of the gas supplied to the battery can be suppressed. Further, the gas and the motor section can be cooled by a single cooling chamber, which is efficient.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a scroll compressor with an integrated motor according to the present invention will be described. FIG. 1 is an axial sectional view of a motor-integrated scroll compressor according to the present embodiment. The housing 1 of the motor-integrated scroll compressor according to the present embodiment is made of an aluminum alloy and has a bowl-shaped front casing 2 having a discharge port 20a at the center of the bottom surface, and is made of an aluminum alloy and installed at an open end of the front casing 2. And a small diameter part,
A cylindrical rear casing 3 formed of a large-diameter portion having a concave portion 3a at an end portion, and a disk-shaped partition portion 3b partitioning between the small-diameter portion and the large-diameter portion; An open end is inserted and fitted on the inner peripheral side of the large-diameter portion of the above, a ring-shaped concave portion 4a and a ring-shaped convex portion 4b are continuously provided on the outer peripheral surface, and a bowl-shaped motor having a hole in the center of the bottom surface It comprises a casing 4 and a bottom plate 41 made of an aluminum alloy and installed so as to cover a hole on the bottom surface of the motor casing 4.

When the motor casing 4 is installed on the inner peripheral side of the large-diameter portion of the rear casing 3, the high-pressure chamber 25 is provided with a recess 3 a formed in the large-diameter portion of the rear casing 3 on the outer peripheral surface of the motor casing 4. It is formed by covering the formed convex portion 4b.

High pressure chamber 25 and discharge port 2 of front casing 2
0a, a high-pressure gas path 6 is provided. The high-pressure gas path 6 is made of steel and has a cylindrical elbow 60 disposed at the discharge hole 20a, a steel pipe 61 having one end screwed to the elbow 60, and a steel pipe 61 formed of steel and having one end screwed. A tubular elbow 62 provided and a steel pipe 6 having one end screwed to the elbow 62
And an elbow 64 made of steel and having a steel pipe 63 screwed at one end and a large diameter portion of the rear casing 3 fitted at the other end and penetrating through the high-pressure chamber 25. The high pressure chamber 25
A discharge pipe 80 made of steel penetrating through is inserted.

When the motor casing 4 is installed on the inner peripheral side of the large diameter portion of the rear casing 3, the rear casing 3
The inner peripheral surface of the large-diameter portion covers the concave portion 4a of the motor casing 4, and a ring-shaped cooling chamber 26 is formed. A steel inflow pipe 70 and an outflow pipe 71 penetrating through the cooling chamber 26 are fitted into the protrusions 4 b of the motor casing 4.

The structure of the compressor section in the motor-integrated scroll compressor of the present embodiment is such that the end plate 20 is not provided, and the cooling chamber 26 and the high-pressure chamber 25 are provided on the outer peripheral side of the motor section 5. 2 is the same as the conventional scroll compressor shown in FIG. 2 except that the drive shaft 30 extends to the motor unit 5 and the shape of the rear casing 3 is different.

On the inner peripheral side of the motor casing 4, a ring-shaped stator 50 installed on the inner peripheral surface of the motor casing 4, a winding 51 wound around a slit (not shown) of the stator 50, A ring-shaped rotor 52 made of magnet and installed in the inner circumferential direction, a part of the drive shaft 30 installed at the center of the rotor 52, and a ball for rotatably installing the drive shaft 30 on the bottom of the motor casing 4. A motor unit 5 including a bearing is provided.

The flow of air as gas in the motor-integrated scroll compressor of this embodiment will be described. The air compressed by the fixed scroll 21 and the orbiting scroll 31 flows into the high-pressure gas passage 6 from the discharge part 23 via the discharge valve 24. The air flows into the ring-shaped high-pressure chamber 25 through the high-pressure gas passage 6. The air circulated in the high-pressure chamber 25 is discharged from the discharge pipe 80 to the outside of the compressor.

The flow of water, which is a cooling fluid, in the motor-integrated scroll compressor of this embodiment will be described. Water flowing into the cooling chamber 26 from the inflow pipe 70 circulates in the ring-shaped cooling chamber 26. At this time, the compressed air in the high-pressure chamber 25 arranged on the outer peripheral side of the cooling chamber 26 or the cooling chamber 2
Heat is transmitted from the motor unit 5 disposed on the inner peripheral side of the tube 6 to the water. The water whose temperature has been transferred and the temperature has risen flows out of the compressor through the outflow pipe 71. Although not shown, a radiator for cooling the heated water and a pump for pumping the water are provided outside the compressor, and the water cooled by the radiator flows into the compressor again from the inflow pipe 70. I do.

In the present embodiment, the housing is formed by the front casing 2, the rear casing 3, the motor casing 4, and the bottom plate 41. In addition to the form in which the housing is formed by connecting a plurality of members as in the present embodiment, the housing can also be embodied as a single member integrally formed. Further, the fixed scroll 21 is formed on the boundary surface 2a of the front casing 2 and fixed to the housing. Alternatively, a member provided with the fixed scroll may be separately provided in the housing, or the fixed scroll may be fixed to the housing. One.

In this embodiment, air is used as the gas to be compressed in the compressor section, but the type of gas is not particularly limited. If measures are taken to further increase the airtightness of the compressor section, hydrogen gas or the like, which is the fuel used in the fuel cell, can be used.

The size and shape of the cooling chamber are not particularly limited. For example, when the cooling fin is provided in a cooling chamber, the heat transfer area is widened, so that the cooling efficiency is improved. Further, in order to further increase the heat transfer area, the partition wall between the cooling chamber and the high-pressure chamber and the partition wall between the cooling chamber and the motor unit may be processed in a wavy shape.

In the present embodiment, the cooling chamber is
The motor casing 4 is formed by fitting the motor casing 4 into the rear casing 3. When the cooling chamber is formed as in the present embodiment, the cooling chamber can be formed more easily. Alternatively, a member having a cooling chamber inside may be manufactured separately from the compressor, and the member may be installed in the motor casing. Because there is no seam in the cooling room wall,
The form is more excellent in liquid tightness. In this case, the member having the cooling chamber inside constitutes a part of the housing.

The material for forming the cooling chamber is not particularly limited. In the present embodiment, the cooling chamber is formed by a member made of an aluminum alloy. The use of an aluminum alloy has a good cooling effect because of good heat transfer. However, the present invention can be implemented in a form using other cast iron or the like.

In this embodiment, water is used as the cooling fluid, but the type of the cooling fluid is not particularly limited. What is necessary is to select suitably what is liquid at use environment temperature, without corroding equipment. There is also a form in which pure water generated in a fuel cell is used as water used as a fluid.

In the present embodiment, a cooling circuit dedicated to the compressor is used. However, a cooling circuit is additionally provided in a cooling circuit for cooling other devices mounted on an automobile or the like. You can also. Since there is no need to separately install a cooling circuit, the form is excellent in space and cost. There is also a form in which a cooling fluid after use is discarded without forming a cooling circuit. Since the circuit is not formed, the device is simplified, so that the space is excellent.

In the present embodiment, the high-pressure gas path is formed from a plurality of steel pipes and elbows. However, there is a mode in which the high-pressure gas path is integrally formed by a single member. When the high-pressure gas path is formed by a single member, the air-tightness is easily secured. Further, in the present embodiment, the high-pressure gas path is installed outside the housing, but there is also a mode in which the high-pressure gas path is installed inside the housing. When installed inside the housing, it is possible to prevent contact between the high-pressure gas path and other devices mounted on an automobile or the like, so that a more reliable embodiment is achieved. Further, the embodiment is excellent in space.

The type and internal arrangement of the motor are not particularly limited. In the present embodiment, the inverter type motor is used, but there is also a mode in which a DC motor is used as it is. Further, the shape of the rotor and the stator, the windings, the arrangement of the magnets, and the like in the motor section are not particularly limited. In the present embodiment, the motor in which the windings are arranged on the stator side and the magnets are arranged on the rotor side is used, but the motor is arranged in the opposite arrangement, that is, the magnets are arranged on the stator side and the windings are arranged on the rotor side. There is also a form using.

In this embodiment, the drive shaft of the orbiting scroll of the compressor unit is the motor rotation shaft as it is. However, the orbiting scroll drive shaft and the motor rotation shaft are separately arranged, and the rotation is transmitted between the two. It can also be implemented in a form in which a mechanism is provided. In this case, the drive shaft in the present invention is constituted by the motor rotation shaft, the rotation transmission mechanism, and the orbiting scroll drive shaft. When it is desired to change the rotation speed of the motor rotation shaft and the orbiting scroll drive shaft, the rotation transmission mechanism may be provided with a rotation speed conversion mechanism.

[0036]

According to the scroll compressor of the present invention, the high-pressure chamber and the cooling chamber are provided on the outer peripheral side of the motor section of the housing, that is, the cooling chamber is provided between the high-pressure chamber and the motor section. Accordingly, the compressor can suppress a decrease in the mass flow rate of the discharge gas discharged from the compressor. Further, the compressor can cool the discharge gas and the motor section by a single cooling chamber.

[Brief description of the drawings]

FIG. 1 is an axial cross-sectional view of a motor-integrated scroll compressor of the present invention.

FIG. 2 is an axial sectional view of a conventional scroll compressor.

[Explanation of symbols]

1: Housing 2: Front casing 20: End plate 2
1: fixed scroll 22: suction part 23: discharge part 24: discharge valve 25: high pressure chamber 26: cooling chamber 3: rear casing 30: drive shaft 31: revolving scroll 32: revolving plate 33: revolving shaft 4: motor casing 41: Bottom plate
5: Motor unit 50: Stator 51: Winding 52: Rotor 6: High-pressure gas path 70: Inflow pipe 71: Outflow pipe 80: Discharge pipe

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H029 AA02 AA16 AB02 BB12 BB32 CC02 CC07 CC09 CC22 CC48 3H039 AA02 AA12 BB08 BB13 CC01 CC26 CC32 CC33 CC50

Claims (1)

[Claims] 1. A housing, a fixed scroll fixed to the housing, an orbiting scroll installed in the housing to be eccentric to the fixed scroll and orbiting along the fixed scroll, and installed in the housing. A motor-integrated scroll compressor having a motor unit for driving the orbiting scroll, wherein the housing is provided adjacent to an outer peripheral side of the motor unit, and a cooling chamber to which a cooling fluid is supplied; A motor-integrated scroll compressor, comprising: a high-pressure chamber provided adjacent to an outer peripheral side and supplied with the compressed gas compressed by the fixed scroll and the orbiting scroll.