CN114165438A - Scroll compressor having a plurality of scroll members - Google Patents

Abstract

The present invention is a scroll compressor with improved efficiency and cooling performance, comprising: a shaft rotatable about an axis; a motor that drives a shaft to rotate; a compressor main body driven by rotation of a shaft; a casing which covers the motor and the compressor main body and has a circular bottom surface facing the motor from the axial direction; and three cluster blocks arranged in a circumferential direction on a bottom surface and provided at an end portion of a wire connected to an outside, each cluster block having a terminal connected to the end portion of the wire and a cluster block main body holding the terminal, the cluster block main body extending from the terminal toward one circumferential side in one cluster block, and the cluster block main bodies extending from the terminal toward the other circumferential side in two cluster blocks.

Description

Scroll compressor having a plurality of scroll members

Technical Field

The present invention relates to a scroll compressor.

Background

As a compressor used in, for example, an air conditioner for a vehicle, a scroll compressor is known (see patent document 1 below). The scroll compressor includes a motor, a compressor main body driven by the motor, and a housing accommodating the motor and the compressor main body.

The motor has a rotor integrally provided on a shaft and a stator covering the rotor from an outer peripheral side. The rotor has a plurality of permanent magnets built therein. The stator is constituted by a stator core and a plurality of coils. By energizing the coil, an electromagnetic force is generated between the permanent magnet and the coil. By this electromagnetic force, a rotational force is applied to the rotor.

A wire for supplying power from a power supply circuit (inverter) is connected to the coil. Specifically, the coils are connected with wires extending from the U, V, W phases of the inverter, respectively. For connection of these wirings, a socket-shaped wiring material called a cluster block is used. The wire collecting block is substantially rectangular. The cluster blocks are arranged on the bottom surface inside the housing. More specifically, three cluster blocks are generally disposed in an annular region between the inner peripheral surface of the housing and the bearing so as to face in the same direction.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 3976512

However, in recent years, there has been an increasing demand for downsizing scroll compressors. Along with this, the space for housing the cluster block described above also tends to be small. As a result, a small space is occupied by the cluster block, and smooth flow of the refrigerant in the casing is affected. This may reduce the efficiency of the scroll compressor and the cooling performance of the motor.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the above problems, and an object thereof is to provide a scroll compressor having improved efficiency and cooling performance.

Means for solving the problems

In order to solve the above problem, a scroll compressor of the present invention includes: a shaft rotatable about an axis; a motor that drives the shaft to rotate; a compressor main body driven by rotation of the shaft; a casing that covers the motor and the compressor main body and has a circular bottom surface facing the motor from the axial direction; and three cluster blocks arranged in a circumferential direction on the bottom surface and provided at an end portion of a wire connected to the outside, each of the cluster blocks having a terminal connected to the end portion of the wire and a cluster block main body holding the terminal, the cluster block main body extending from the terminal toward one side in the circumferential direction in one of the cluster blocks, and the cluster block main body extending from the terminal toward the other side in the circumferential direction in two of the cluster blocks.

Effects of the invention

According to the present invention, a scroll compressor having improved efficiency and cooling performance can be provided.

Drawings

Fig. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention.

Fig. 2 is a diagram showing the structure of the bottom surface of the housing in the embodiment of the present invention.

Description of the symbols

100 scroll compressor

1 axle

2 Motor

3 compressor body

4 casing

4S inner peripheral surface

5 cover

6 Upper bearing

7 lower bearing

8 drive bush

9 suction port

10 axle main body

11 minor diameter portion

12 big diameter part

13 eccentric shaft part

21 rotor

22 stator

31 fixed scroll

31A first end plate

31B first helical plate

32 movable scroll

32A second end plate

32B second spiral plate

32C boss part

41 casing body

42 bottom part

42A bottom surface

42B back side

43 cover part

A eccentric shaft

Bh line concentration block main body

CB line concentration block

CB1 first hub block

CB2 second hub block

F radiating fin

H opening part

O axis

P suction flow path

Pe power element

S space

Detailed Description

(Structure of scroll compressor)

Hereinafter, a scroll compressor 100 according to an embodiment of the present invention will be described with reference to fig. 1 and 2. The scroll compressor 100 is used, for example, to compress a refrigerant of an air conditioner for a vehicle. As shown in fig. 1, the scroll compressor 100 includes a shaft 1, a motor 2, a compressor main body 3, a housing 4, a cover 5, an upper bearing 6, a lower bearing 7, a drive bushing 8, a suction port 9, and a cluster block CB.

(Structure of shaft)

The shaft 1 extends along an axis O and is rotatable about the axis O. The shaft 1 has a shaft body 10, a small diameter portion 11, a large diameter portion 12, and an eccentric shaft portion 13. The shaft body 10 has a cylindrical shape centered on the axis O. The shaft main body 10 has a uniform diameter dimension throughout the entire region in the axis O direction. A rotor 21 (described later) of the motor 2 is attached to an outer peripheral surface of the shaft body 10.

A small diameter portion 11 is provided on one side (lower side) of the shaft main body 10 in the axis O direction. The small diameter portion 11 has a cylindrical shape centered on the axis O and has a smaller diameter than the shaft main body 10. The small diameter portion 11 is supported from one side (lower side) in the axis O direction by a lower bearing 7 attached to the housing 4. The lubricating oil is supplied to the lower bearing 7 along with the refrigerant guided from the suction port 9 described later.

The large diameter portion 12 is provided on the other side (upper side) in the axis O direction of the shaft body 10. The large-diameter portion 12 is cylindrical about the axis O and has a larger diameter than the shaft body 10. The large diameter portion 12 is radially supported by an upper bearing 6 fixed to the housing 4. The lubricating oil is supplied to the upper bearing 6 along with the refrigerant guided from the suction port 9 described later.

An eccentric shaft portion 13 is provided further above (on the other side in the axis O direction) the large diameter portion 12. The eccentric shaft portion 13 protrudes from the large diameter portion 12 toward the other side in the axis O direction. The eccentric shaft portion 13 is parallel to the axis O, and has a cylindrical shape centered on an eccentric shaft a extending at a position radially offset from the axis O. Therefore, when the shaft 1 rotates, the eccentric shaft portion 13 revolves (revolves) around the axis O.

(Structure of Motor)

The motor 2 applies a rotational driving force to the shaft 1. The motor 2 has a rotor 21 and a stator 22. The rotor 21 is fixed to the shaft body 10. The rotor 21 is cylindrical with the axis O as the center. Although not shown in detail, the rotor 21 includes a plurality of magnets. The stator 22 covers the rotor 21 from the outer peripheral side. The stator 22 is formed by laminating a plurality of steel plates in the axis O direction, and a plurality of coils are formed by winding a copper wire around the steel plates.

When the stator 22 is energized, electromagnetic force is generated between the stator 22 and the rotor 21, and a rotational force about the axis O is applied to the rotor 21. Thereby, the shaft 1 rotates about the axis O.

(Structure of compressor body)

The compressor body 3 is driven by rotation of the shaft 1 by the motor 2. The compressor body 3 has a fixed scroll 31 and a movable scroll 32. The fixed scroll 31 has a disc-shaped first end plate 31A centered on the axis O, and a first spiral plate 31B provided on one side (lower side) of the first end plate 31A in the axis O direction. The first spiral plate 31B extends spirally about the axis O. The fixed scroll 31 is fixed to the housing 4.

The movable scroll 32 has a disc-shaped second end plate 32A, a second spiral plate 32B provided on the other side (upper side) of the second end plate 32A in the axis O direction, and a boss portion 32C. The second spiral plate 32B extends spirally about the axis O. The dimension of the second spiral plate 32B in the axis O direction is equal to the dimension of the first spiral plate 31B in the axis O direction. By thus engaging the first spiral plate 31B and the second spiral plate 32B from the axis O direction, a compression chamber is formed therebetween.

The boss portion 32C is a cylindrical portion that protrudes from the second end plate 32A toward one side (lower side) in the axis O direction. The boss portion 32C is attached to the eccentric shaft portion 13 of the shaft 1 via the drive bush 8. The eccentric shaft portion 13 revolves around the axis O, and the revolving force is transmitted to the movable scroll 32 through the drive bush 8. Thereby, the movable scroll 32 revolves around the axis O. Although not shown in detail, the rotation (rotation) of the movable scroll 32 itself is restricted by a cross ring.

As the movable scroll 32 revolves, the volume of the compression chamber changes with time, and the refrigerant is compressed in the compression chamber while being sent from the radially outer side to the radially inner side, and the pressure thereof rises. The refrigerant in a high-pressure state is guided into the casing 4 through the opening H formed in the first end plate 31A of the fixed scroll 31. Then, the air is discharged to the outside through a discharge port formed in the housing 4.

(Structure of case and cover)

The housing 4 is a bottomed cylindrical container that houses the shaft 1, the motor 2, and the compressor body 3. Specifically, the housing 4 includes a cylindrical housing body 41 centered on the axis O, a bottom portion 42 for closing one opening of the housing body 41 in the axis O direction, a lid portion 43 for closing the other opening in the axis O direction, and the cover 5.

(Structure of Heat sink fins and wire collecting block)

Of the two surfaces in the thickness direction of the bottom portion 42, the surface facing the other side in the axis O direction (i.e., the motor 2 side) is a bottom surface 42A. As shown in fig. 2, a plurality of heat radiating fins F are formed on the bottom surface 42A, and a plurality of (three) cluster blocks CB are arranged.

The heat dissipating fins F are formed in an arc shape centered on the axis O, and are arranged at intervals in the radial direction and the circumferential direction. That is, the heat dissipating fins F are arranged concentrically about the axis O. Each of the heat dissipating fins F is divided into a plurality of pieces in the circumferential direction. Further, the heat dissipation fins F may be formed integrally without being divided.

The three cluster blocks CB are arranged on the bottom surface 42A at intervals in the circumferential direction. Each cluster block CB has a terminal T and a cluster block body Bh holding the terminal T. The wiring led from the stator 22 of the motor 2 is electrically connected to the terminal T. The cluster block body Bh has a substantially rectangular shape extending from the terminal T in the circumferential direction.

In only one of the three cluster blocks CB (first cluster block CB1), the cluster block main body Bh extends from the terminal T toward the circumferential direction side. On the other hand, in the remaining two cluster blocks CB (second cluster blocks CB2), the cluster block main bodies Bh extend from the terminal T toward the other side in the circumferential direction. Thereby, a certain space S is formed on the inner peripheral side of the three cluster blocks CB. The space S is set as a region through which the refrigerant flows.

In all the cluster blocks CB, the terminals T are arranged offset to the radially outer portion of the cluster block body Bh. That is, the three terminals T are arranged at the same radial position. A wiring, not shown, is connected to an end Ct of the cluster block body Bh on the side opposite to the terminal T.

As shown in fig. 1 again, the surface of the bottom portion 42 opposite to the bottom surface 42A (that is, the surface facing outward) is a back surface 42B. The cover 5 is attached to the back surface 42B. An electric component E including an IPM (intelligent power module) and the like is disposed on the rear surface 42B and covered from the outside by a cover 5. The power element Pe as a heat generating component of the electric component E is preferably located on the opposite side of the space S shown in fig. 2. That is, the power element Pe is disposed on the opposite side of the space S where the refrigerant easily flows.

(Structure of suction port)

A suction port 9 for guiding the refrigerant from the outside into the casing 4 is attached to the casing main body 41. The suction port 9 communicates the inside and outside of the casing main body 41, and guides the refrigerant toward the bottom surface 42A. As shown in fig. 2, the suction port 9 extends in a direction including a tangential direction component of a circle formed by the bottom surface 42A when viewed from the axis O direction. Therefore, the refrigerant flows in the circumferential direction around the axis O on the bottom surface 42A. That is, the heat radiating fins F are arranged in the direction in which the refrigerant flows. The direction Df in which the refrigerant flows through the suction port 9 is the forward side in the rotation direction of the shaft 1. Therefore, the refrigerant flowing on the bottom surface 42A so as to swirl around the axis O does not obstruct the flow thereof, and new refrigerant is introduced through the suction port 9. The first manifold block CB1 is located upstream in the refrigerant flow direction. Therefore, the space S is open to the upstream side in the flow direction of the refrigerant.

(Effect)

Here, in recent years, the demand for downsizing the scroll compressor 100 has particularly increased. Along with this, the space for accommodating the cluster block CB described above also tends to become small. As a result, a small space is occupied by the cluster block CB, and the smooth flow of the refrigerant in the casing 4 is affected. This may reduce the efficiency of the scroll compressor 100 and the cooling performance of the motor 2.

On the other hand, according to the above-described structure, in one of the three cluster blocks CB, the cluster block main body Bh extends toward one circumferential side, and in the two cluster blocks CB, the cluster block main body Bh extends toward the other circumferential side. That is, there are two cluster block bodies Bh extending in the same direction and one cluster block body Bh extending in a direction different from them. This ensures a relatively large space S radially inside each cluster block body Bh. In other words, the space S surrounded by the three cluster blocks CB can be increased. On the other hand, for example, in the case where three cluster blocks CB are arranged so as to extend in the same direction, a relatively large space is occupied by these cluster blocks CB. As a result, the flow of the refrigerant is blocked, and there is a possibility that the efficiency of the scroll compressor 100 is lowered or the cooling efficiency of the refrigerant to the motor 2 is lowered. However, according to the above configuration, the space S for allowing the refrigerant to flow therethrough can be sufficiently secured, and thus the possibility of occurrence of such a problem can be reduced.

Further, according to the above configuration, the one cluster block CB, in which the cluster block main body Bh extends toward the one circumferential side, is located on the upstream side in the flow direction of the refrigerant. That is, the space S surrounded by the cluster block CB is largely opened toward the side (upstream side) where the refrigerant flows out of both sides in the flow direction. This enables the refrigerant to smoothly flow into the space S. As a result, the possibility that the flow of the refrigerant is blocked by the cluster block CB can be further reduced.

Here, the high-voltage current supplied from the inverter flows to each terminal T. Therefore, noise due to these currents is easily generated in the vicinity of the terminal T. According to the above structure, such terminals T are concentrated on the radially outer portion in the cluster block body Bh. This can ensure a large stable region where noise is less likely to occur radially inward of the cluster block body Bh. As a result, the degree of freedom in layout of the circuit components can be improved, and stable operation of the circuit components can be realized.

Further, according to the above configuration, the power element Pe as a heat generating component is arranged on the opposite side of the region surrounded by the three cluster blocks CB in the bottom surface 42A. In the region (space S) surrounded by the cluster blocks CB, the refrigerant flows smoothly without being blocked by the cluster blocks CB themselves. This can provide a more favorable cooling effect to the power element Pe disposed on the opposite side. This enables the power element Pe to operate more stably.

The embodiments of the present invention have been described above. Further, various changes and modifications can be made to the above-described configuration without departing from the scope of the present invention.

[ notes ]

The scroll compressor 100 according to each embodiment is grasped as follows, for example.

(1) The scroll compressor 100 according to the first aspect includes: a shaft 1 rotatable about an axis O; a motor 2 for rotating the shaft 1; a compressor body 3 driven by rotation of the shaft 1; a casing 4 covering the motor 2 and the compressor body 3 and having a circular bottom surface 42A facing the motor 2 from the axis O direction; and three cluster blocks CB arranged in the circumferential direction on the bottom surface 42A and provided at ends of wires connected to the outside, each of the cluster blocks CB having a terminal T connected to an end of the wire and a cluster block body Bh holding the terminal T, the cluster block body Bh extending from the terminal T toward one circumferential side in one of the cluster blocks CB, and the cluster block bodies Bh extending from the terminal T toward the other circumferential side in two of the cluster blocks CB.

According to the above-described structure, in one of the three cluster blocks CB, the cluster block main body Bh extends toward one circumferential side, and in the two cluster blocks CB, the cluster block main body Bh extends toward the other circumferential side. That is, there are two cluster block bodies Bh extending in the same direction and one cluster block body Bh extending in a direction different from them. This ensures a relatively large space S radially inside each cluster block body Bh. In other words, the space S surrounded by the three cluster blocks CB can be increased. On the other hand, for example, in the case where three cluster blocks CB are arranged so as to extend in the same direction, a relatively large space is occupied by these cluster blocks CB. As a result, the flow of the refrigerant is blocked, and there is a possibility that the efficiency of the scroll compressor 100 is lowered or the cooling efficiency of the refrigerant to the motor 2 is lowered. However, according to the above configuration, the space S for allowing the refrigerant to flow therethrough can be sufficiently secured, and thus the possibility of occurrence of such a problem can be reduced.

(2) In the scroll compressor 100 according to the second aspect, a suction port 9 may be further provided, which guides the refrigerant into the housing 4 and forms a flow from one side to the other side in the circumferential direction on the bottom surface 42A, and the one cluster block CB, in which the cluster block main body Bh extends to one side in the circumferential direction, may be located on the upstream side in the flow direction of the refrigerant.

According to the above configuration, one cluster block CB, in which the cluster block main body Bh extends toward one side in the circumferential direction, is located on the upstream side in the flow direction of the refrigerant. That is, the space S surrounded by the cluster block CB is largely opened toward the side (upstream side) where the refrigerant flows out of both sides in the flow direction. This enables the refrigerant to smoothly flow into the space S. As a result, the possibility that the flow of the refrigerant is blocked by the cluster block CB can be further reduced.

(3) In the scroll compressor 100 according to the third aspect, the terminal T may be disposed at a radially outer portion of the manifold block body Bh.

The high-voltage current supplied from the inverter flows to each terminal T. Therefore, noise due to these currents is easily generated in the vicinity of the terminal T. According to the above configuration, such terminals T are concentrated on the radially outer portion of the cluster block body Bh. This can ensure a large stable region where noise is less likely to occur radially inward of the cluster block body Bh. As a result, the degree of freedom in layout of the circuit components can be improved, and stable operation of the circuit components can be realized.

(4) In the scroll compressor 100 according to the fourth aspect, the power element Pe as a heat generating component may be disposed in a region on the inner peripheral side of the three cluster blocks CB and on the opposite side of the bottom surface 42A.

According to the above configuration, the power element Pe as a heat generating component is arranged on the bottom surface 42A on the opposite side of the region surrounded by the three cluster blocks CB. In the region (space S) surrounded by the cluster blocks CB, the refrigerant flows smoothly without being blocked by the cluster blocks CB themselves. This can provide a more favorable cooling effect to the power element Pe disposed on the opposite side. This enables the power element Pe to operate more stably.

Industrial applicability

According to the present invention, a scroll compressor having improved efficiency and cooling performance can be provided.

Claims (5)

1. A scroll compressor is characterized by comprising:

a shaft rotatable about an axis;

a motor that drives the shaft to rotate;

a compressor main body driven by rotation of the shaft;

a casing that covers the motor and the compressor main body and has a circular bottom surface facing the motor from the axial direction; and

three cluster blocks arranged in a circumferential direction on the bottom surface and provided at an end of a wire connected to the outside,

each of the cluster blocks has a terminal connected to an end of the wire harness and a cluster block main body holding the terminal,

in one of the cluster blocks, the cluster block main body extends from the terminal toward one circumferential side, and in both of the cluster blocks, the cluster block main body extends from the terminal toward the other circumferential side.

2. The scroll compressor of claim 1,

a suction port that guides the refrigerant into the housing and forms a flow from one side to the other side in the circumferential direction on the bottom surface,

the one cluster block, in which the cluster block main body extends toward one circumferential side, is located on an upstream side in a flow direction of the refrigerant.

3. The scroll compressor of claim 1 or 2,

the terminals are disposed on a radially outer portion of the cluster block body.

4. The scroll compressor of claim 1 or 2,

power elements as heat generating components are arranged in regions on the inner peripheral sides of the three concentrator blocks and on the opposite side of the bottom surface.

5. The scroll compressor of claim 3,

power elements as heat generating components are arranged in regions on the inner peripheral sides of the three concentrator blocks and on the opposite side of the bottom surface.

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