JP6934624B2 - Scroll compressor - Google Patents

Description

The present disclosure relates to a scroll compressor used in a vehicle air conditioning system or the like.

In vehicle air conditioning systems and the like, scroll compressors are used to compress the refrigerant. The scroll type compressor includes an electric element composed of an electric motor, a compression element having a movable scroll and a fixed scroll, and an inverter for driving the electric element. Then, for example, these are housed in the housing in the order of the compression element, the electric element, and the inverter (for example, Patent Document 1).

By the way, since the inverter becomes hot while driving the compressor, it is necessary to cool it appropriately. Therefore, in Patent Document 1, the inverter and the electric element are partitioned by a partition wall, the inverter is thermally connected to one surface of the partition wall, and the refrigerant sucked into the housing is connected to the other surface of the partition wall. It discloses a technology that cools the inverter by touching it.

Japanese Unexamined Patent Publication No. 2012-21509

However, with the above configuration, most of the refrigerant sucked into the housing comes into contact with the bearing portion of the rotor of the electric element. In particular, when the sucked refrigerant is in a gas-liquid mixed state and the liquid component of the refrigerant comes into contact with the bearing portion, the lubricating oil of the bearing between the bearing portion and the rotor shaft may be washed away. In this case, there is a concern that the lubricity of the bearing may be lowered, the operating efficiency of the compressor may be lowered, or the bearing may be worn.

Therefore, an object of the present disclosure is to provide a scroll type compressor capable of suppressing the suction refrigerant from directly contacting the bearing of the bearing portion and deteriorating the lubricity of the bearing.

The scroll compressor according to the present disclosure includes an electric element having a rotor that rotates about an axial center in a lateral direction substantially orthogonal to the direction of gravity, a compression element driven by the electric element to compress a refrigerant, and an electric element. A scroll compressor comprising a controller for driving the compressor, a housing for accommodating the controller, the electric element, and the compression element in this order in the axial direction, and a controller for accommodating the controller in the housing. A partition is divided into a chamber and an electric element chamber for accommodating the electric element, and a partition wall to which the controller is thermally connected, an electric element chamber, a suction chamber on the controller side where the refrigerant is sucked, and a compression element. It is provided with a support wall having a bearing portion that supports the rotor as well as a drive chamber on the side where the rotor is arranged, and the housing has a suction port for a refrigerant that communicates with the suction chamber from above. However, the suction chamber is provided with a first shielding wall that shields between the suction port and the bearing portion so as to face the opening direction of the suction port.

According to the present disclosure, the first shielding wall can prevent the refrigerant sucked from the suction port, particularly the liquid component, from directly contacting the bearing of the bearing portion, and suppress the deterioration of the lubricity of the bearing. Can be done.

FIG. 1 is a drawing showing a configuration of a scroll compressor according to an embodiment of the present disclosure with a part thereof as a cross section. FIG. 2 is a drawing showing a configuration when the compressor of FIG. 1 is divided and developed along the line II-II.

The scroll compressor according to the present disclosure includes an electric element having a rotor that rotates about an axial center in a lateral direction substantially orthogonal to the direction of gravity, a compression element driven by the electric element to compress a refrigerant, and an electric element. A scroll compressor comprising a controller for driving the compressor, a housing for accommodating the controller, the electric element, and the compression element in this order in the axial direction, and a controller for accommodating the controller in the housing. A partition is divided into a chamber and an electric element chamber for accommodating the electric element, and a partition wall to which the controller is thermally connected, an electric element chamber, a suction chamber on the controller side where the refrigerant is sucked, and a compression element. It is provided with a support wall having a bearing portion that supports the rotor as well as a drive chamber on the side where the rotor is arranged, and the housing has a suction port for a refrigerant that communicates with the suction chamber from above. However, the suction chamber is provided with a first shielding wall that shields between the suction port and the bearing portion so as to face the opening direction of the suction port.

Further, in the scroll type compressor, the end of the first shielding wall in the direction orthogonal to the axial direction is connected to the inner surface of the housing, and the end on the compression element side in the axial direction is connected to the support wall. The end on the controller side in the axial direction may be located with a gap with respect to the partition wall.

Further, in the scroll type compressor, the suction chamber may be provided with a second shielding wall below the first shielding wall and surrounding the bearing portion together with the first shielding wall.

Further, in the scroll type compressor, heat radiation fins may be attached at a position on the surface of the partition wall on the suction chamber side corresponding to the connection point of the controller.

Further, in the scroll type compressor, the heat radiation fins may be attached so as to be oblique to the direction of gravity.

Hereinafter, a preferred embodiment of the present disclosure will be described as an example when applied to a scroll compressor used in a vehicle air conditioning system.

[Overall configuration of compressor]
FIG. 1 is a drawing showing a configuration of a scroll type compressor (hereinafter, also simply referred to as “compressor”) 100 according to the embodiment of the present disclosure, with a part thereof in cross section. The compressor 100 includes a controller 1, an electric element 2 having a rotor 22 that rotates around an axis A in a lateral direction (approximately horizontal direction in the present embodiment) substantially orthogonal to the direction of gravity, and an electric element. A compression element 3 driven by 1 to compress the refrigerant, and a housing 4 accommodating the controller 1, the electric element 2, and the compression element 3 in the axial direction A in this order are provided.

In the following, the direction in which the controller 1 is located with respect to the electric element 2 in the axial center A direction is referred to as "one direction", and the direction in which the compression element 3 is located with respect to the electric element 2 is referred to as "other direction". .. Further, an upward direction and a downward direction are set so as to be orthogonal to the axis A direction (see FIG. 1).

The housing 4 has a cylindrical shape along the axis A, and in the internal space thereof, a controller chamber 41 accommodating the controller 1, an electric element chamber 42 accommodating the electric element 2, and a compression element 3 A compression element chamber 43 for accommodating the above is formed. Of these, the controller chamber 41 and the electric element chamber 42 are separated by a partition wall 44. Further, the housing 4 can be divided into at least a first portion 4a defining the control chamber 41 and a second portion 4b defining the electric element chamber 42 and the compression element chamber 43, and the partition wall 44 is on the controller chamber 41 side. It is provided in the portion 4a.

Further, the electric element chamber 42 is also divided into two spaces arranged in the axial direction A direction. That is, the electric element chamber 42 is a suction chamber 42a on the one-way side (control element 1 side) where the refrigerant is sucked, and a drive chamber on the other direction side (compression element 3 side) where the rotor 20 is arranged. It is divided into 42b. The suction chamber 42a and the drive chamber 42b are separated by a support wall 45 provided with a bearing portion 21 that pivotally supports the rotor 22.

The housing 4 is formed with a suction port 46 for taking in the refrigerant from the circulation flow path of the air conditioning system into the housing 4. The suction port 46 is formed so as to penetrate the upper part of the housing 4, and communicates with the suction chamber 42a of the electric element chamber 42 from above. Further, the housing 4 is also formed with a discharge port 47 that communicates with the compression element chamber 43 from above.

In the compressor 100 according to the present embodiment, the low-pressure refrigerant taken into the housing 4 from the external circulation flow path through the suction port 46 is compressed by the compression element 3 driven by the electric element 2 to obtain a high pressure. The structure is such that the exhausted refrigerant is sent out from the discharge port 47. Hereinafter, the controller 1, the electric element 2, and the compression element 3 will be described in more detail.

The controller 1 is composed of a flat rectangular drive circuit, and in the present embodiment, this drive circuit is an inverter circuit including an IPM (Intelligent Power Module) and the like and having a high heat generation density. The controller 1 is mounted on the substrate so that its main surface on one direction faces a substrate (not shown). Further, the main surface of the controller 1 on the other direction side is thermally connected to the partition wall 44 that separates the controller chamber 41 and the electric element chamber 42. In this case, the controller 1 and the partition wall 44 may be in direct contact with each other, or may be in contact with each other via a high thermal conductive material.

The electric element 2 has a drive shaft 20, a bearing portion 21, a rotor 22, and a stator 23. The drive shaft 20 is composed of a main shaft having a shaft center A and an eccentric shaft connected to the other end of the main shaft. Further, a through hole 45a is formed in the central portion of the support wall 45, and a bearing 21a such as a radial ball bearing forming the bearing portion 21 is internally fitted in the through hole 45a. Then, one end of the main shaft of the drive shaft 20 is inserted and supported by the bearing 21a.

A plurality of through holes 45b arranged in the circumferential direction are formed in the outer peripheral portion (outer portion of the bearing portion 21) of the support wall 45. The suction chamber 42a and the drive chamber 42b communicate with each other through the through hole 45b. Therefore, the refrigerant sucked into the suction chamber 42a mainly flows to the drive chamber 42b through the through hole 45b.

A spindle bearing member (not shown) is arranged in the housing 4 so as to partition the electric element 2 and the compression element 3. A bearing such as a radial ball bearing is also provided in the central portion of the spindle bearing member, and the other end of the spindle of the drive shaft 20 is rotatably supported by this bearing.

A rotor 22 is attached to the central portion of the main shaft of the drive shaft 20. The rotor 22 is formed in a cylindrical shape by, for example, laminating a plurality of disk-shaped magnetic materials having a central hole, and is provided so as to be fitted onto the drive shaft 20. Further, a permanent magnet is housed in the laminated body of the magnetic material, and the rotor 22 is magnetized by the permanent magnet. The stator 23 is formed in a cylindrical shape as a whole by arranging a plurality of coils around which a conducting wire is wound in a circular shape so as to surround the outer periphery of the rotor 22. The stator 23 is fixed to the inner wall of the housing 4 via a member (not shown).

In such an electric element 2, when a magnetic field is formed by energizing the stator 23, an attractive force or a repulsive force is generated between the rotor 22 and the stator 23, and the drive shaft 20 rotates in a predetermined direction together with the rotor 22. The compression element 3 is driven by the rotation of the drive shaft 20.

The compression element 3 includes a fixed scroll 30 and a movable scroll 33. The fixed scroll 30 has a fixed plate 31 orthogonal to the axis A, and a spiral partition wall 32 is erected on the main surface of the fixed plate 31 on one direction side. The movable scroll 33 has a disk-shaped movable plate 34 orthogonal to the axis A, and a spiral partition wall 35 is erected on the main surface of the movable plate 34 on the other direction side.

The fixed scroll 30 and the movable scroll 33 are arranged so that the partition walls 32 and 35 mesh with each other. An eccentric shaft (not shown) is connected to the other end of the main shaft of the drive shaft 20. The central portion of the movable scroll 33 is rotatably supported by the eccentric shaft of the drive shaft 20 via a bearing such as a radial ball bearing.

In such a compression element 3, when the electric element 2 is driven and the rotor 22 is rotated, the movable scroll 33 rotates (revolves) around the axis A with the rotation of the drive shaft 20. Then, the refrigerant in the space between the fixed scroll 30 and the movable scroll 33 is compressed. The compressed refrigerant pushes open the reed valve that opens and closes the through hole from the through hole formed in the fixed plate 31 of the fixed scroll 30 and flows to the discharge chamber 36 on the other side of the fixed scroll 30. Then, it is discharged from the discharge chamber 36 to the external circulation flow path through the discharge port 47.

[Structure that shields the refrigerant]
By the way, in the compressor 100 according to the present embodiment, in addition to the above configuration, in order to prevent the refrigerant taken into the suction chamber 42a from the external circulation flow path from coming into direct contact with the bearing portion 21. It has a configuration that shields the refrigerant. This configuration will be described in detail below with reference to FIG. 2, which shows a state in which the housing 4 is divided into a first portion 4a and a second portion 4b by a line II-II.

The suction chamber 42a of the housing 4 is provided with a first shielding wall 50 that shields between the suction port 46 and the bearing portion 21 with its upper surface facing the opening direction (downward) of the suction port 46. The first shielding wall 50 extends until the ends 51 and 52 in the directions orthogonal to both the vertical direction and the axial center A direction (hereinafter, referred to as “left-right direction”) in FIG. 2 are connected to the inner surface of the housing 4. It is installed. That is, the first shielding wall 50 is located below the suction port 46 and above the bearing portion 21, and has a flat plate shape extending in the axial center A direction and the left-right direction.

Note that FIG. 2 shows a configuration in which the first shielding wall 50 is extended so as to avoid the through hole 45b of the support wall 45. Therefore, one side of the first shielding wall 50 in the left-right direction is curved upward, and the end portion 51 thereof is connected to the inner surface of the housing 4 in the vicinity of the suction port 46. However, the present invention is not limited to such a configuration, and the first shielding wall 50 may be extended so as to cross the through hole 45b. The ends 51 and 52 are both ends of the first shielding wall 50 in the radial direction of the housing 4, that is, in the direction orthogonal to the axial center A direction.

As shown in FIG. 1, the other end (the end on the compression element 3 side) 53 of the first shielding wall 50 in the axial direction A direction is connected to the wall surface on one side of the support wall 45. On the other hand, one end (the end on the controller 1 side) 54 of the first shielding wall 50 in the axial direction A direction is located facing the partition wall 44 and having a gap 55 with respect to the partition wall 44. .. In the example shown in FIG. 1, one end 54 of the first shielding wall 50 is located on one side in the axial direction A direction with respect to the opening in the housing 4 of the suction port 46. That is, when viewed from above, all the openings in the housing 4 of the suction port 46 extend in the axial direction A direction of the first shielding wall 50 until all of them are located within the range of the upper surface of the first shielding wall 50. ..

Further, the compressor 100 according to the present embodiment includes a second shielding wall 60 in addition to the first shielding wall 50. The second shielding wall 60 is provided below the first shielding wall 50 and so as to surround the bearing portion 21 together with the first shielding wall 50. In the example of FIG. 2, the first shielding wall 50 and the second shielding wall 60 have the same dimensions in the axial center A direction, and their ends in one direction are flush with each other.

The reason why the ends of the first shielding wall 50 and the second shielding wall 60 in one direction are flush with each other is as follows.

First, when the dimension of the first shielding wall 50 in the axial center A direction is shorter than the dimension of the second shielding wall 60 in the axial center A direction, the liquid component of the refrigerant flowing from the suction port 46 directly hits the second shielding wall 60. The possibility increases. As a result, the proportion of the liquid component flowing to the bearing portion 21 increases, and the effect of suppressing the decrease in lubricity of the bearing 21a may be reduced.

Next, when the dimension of the first shielding wall 50 in the axial center A direction is longer than the dimension of the second shielding wall 60 in the axial center A direction, the distance between the second shielding wall 60 and the partition wall 44 becomes large. Therefore, as will be described later, the proportion of the refrigerant that reaches the lower part of the housing 4 and is reflected by the inner surface of the housing 4 and heads upward is reduced by the second shielding wall 60, and the effect of suppressing the decrease in the lubricity of the bearing 21a is reduced. May be reduced. Further, the ratio of the refrigerant hitting the heat radiating fins 70, which will be described later, may decrease, and the heat radiating effect of the controller 1 may be reduced.

For these reasons, the ends of the first shielding wall 50 and the second shielding wall 60 in one direction are flush with each other. However, even if the above-mentioned effect reduction occurs, the effect of suppressing the decrease in lubricity can be obtained to a certain extent by providing the first shielding wall 50 and the second shielding wall 60. Therefore, it is not essential that the ends of the first shielding wall 50 and the second shielding wall 60 in each direction be flush with each other.

The first shielding wall 50 and the second shielding wall 60 may be integrally formed with the housing 4, or may be formed as separate bodies and connected to the inside of the housing 4 by welding or adhesion.

[Operation and action effect]
In the scroll type compressor 100 described above, when the power is supplied to the stator 23 and the electric element 2 is rotationally driven, the movable scroll 33 revolves around the axis A as the drive shaft 20 rotates. Then, the refrigerant sucked from the suction port 46 is taken into the compression element 3 from the suction chamber 42a via the drive chamber 42b and compressed. The compressed refrigerant gas is sent out from the discharge port 47 via the discharge chamber 36.

During this time, the refrigerant taken into the suction chamber 42a from the outside is blocked from flowing to the bearing portion 21 by the first shielding wall 50 located in front of the suction chamber 42a in the flow direction. After that, a part of the refrigerant (particularly the gas component of the refrigerant) flows to the drive chamber 42b through the through hole 45b at the upper part of the support wall 45, and many other refrigerants go to one side in the axial center A direction and gravity. Along the partition wall 44, it goes downward through the gap 55.

Since the left-right end portions 51 and 52 of the first shielding wall 50 extend to the inner surface of the housing 4, more refrigerant goes to one side in the axial center A direction and is along the partition wall 44. Then, it goes downward through the gap 55.

Next, the refrigerant flowing downward from the gap 55 reaches the inner surface of the lower portion of the housing 4 along the partition wall 44. Some of the refrigerants that have reached the lower part of the housing 4 are reflected by the inner surface of the housing 4 and head upward, but since such refrigerants are blocked by the second shielding wall 60, they pass through the bearing portion 21. The flow is blocked. Then, many other refrigerants flow to the drive chamber 42b through the through hole 45b at the lower part of the support wall 45.

As described above, the refrigerant taken into the suction chamber 42a is directly blocked from contacting the bearing portion 21 by the first shielding wall 50 and the second shielding wall 60. Therefore, it is possible to prevent the lubricating oil of the bearing 21a from being washed away by a particularly liquid component contained in the refrigerant.

Moreover, the refrigerant is mainly guided to the first shielding wall 50 and flows downward along the partition wall 44 while contacting the partition wall 44. Therefore, the partition wall 44 is cooled by the relatively low temperature refrigerant immediately after being inhaled. Therefore, the controller 1 thermally connected to the partition wall 44 can be efficiently dissipated (cooled).

Further, as shown in FIGS. 1 and 2, the heat radiation fin 70 is attached to the wall surface on the other side of the partition wall 44 at a position corresponding to the connection point of the controller 1. The heat radiation fins 70 are attached so as to be oblique to the direction of gravity (downward in FIG. 2). As a result, the heat generated by the controller 1 is transferred to the heat radiating fins 70 through the partition wall 44, and the refrigerant flowing along the partition wall 44 contacts the heat radiating fins 70 and takes away the heat. Further, since the heat radiation fins 70 are attached in the oblique direction, the distance when the refrigerant flows down the cooling fins 70 becomes long, and the contact area of the refrigerant with the cooling fins 70 also becomes large. Therefore, heat dissipation (cooling) of the controller 1 can be performed more efficiently.

As described above, the refrigerant when taken into the suction chamber 42a is generally in a gas-liquid mixed state of the gas component and the liquid component of the refrigerant. However, such a refrigerant promotes gas-liquid separation by contact with the first shielding wall 50 and the second shielding weapon 60, and contact with the inner surface of the housing 4 after rebounding from them. Therefore, even if the refrigerant after the gas-liquid separation has progressed reaches the bearing portion 21, since the ratio of the liquid component in the refrigerant is reduced at that time, less lubricating oil is washed away from the bearing 21a.

Further, since the heat radiating fins 70 are attached in the oblique direction, the surface area of the heat radiating fins 70 can be increased. Therefore, gas-liquid separation of the refrigerant in the heat radiation fin 70 can be further promoted.

Further, in the present embodiment, the first shielding wall 50 and the second shielding wall 60 are provided respectively, and the reason is as follows.

Since the refrigerant passes through the electric element chamber 42, even if the configuration of the present embodiment is used, a part of the refrigerant always reaches the bearing 21a. As a result, the lubricating oil is gradually washed away, if at all. Therefore, the refrigerant contains an oil component in a predetermined ratio in advance in order to maintain the lubricity of the bearing 21a.

Here, if one end 54 of the first shielding wall 50 and one end of the second shielding wall 60 corresponding to this one end 54 are connected to each other, the periphery of the through hole 45a is covered and sealed. For example, the refrigerant from the suction chamber 42a side to the bearing portion 21 can be blocked. However, with such a configuration, it becomes difficult for the oil component contained in the refrigerant to reach the bearing 21a. As a result, the lubricating oil is gradually washed away, which may eventually cause the bearing 21a to wear.

Therefore, if the first shielding wall 50 and the second shielding wall 60 are provided respectively as in the present embodiment, the refrigerant reaches the through hole 45a although the ratio is small, and the oil component contained in the refrigerant is also a bearing. It can reach 21a.

From these facts, in order to achieve both the continuous supply of the oil component for maintaining the lubricity of the bearing 21a while effectively reducing the amount of the refrigerant reaching the through hole 45a, the present embodiment will be described. The circumference of the through hole 45a is not sealed.

Although the present disclosure has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various modifications and modifications are obvious to those skilled in the art. It should be understood that such modifications and modifications are included therein, as long as they do not deviate from the scope of the invention according to the appended claims.

The present invention can be applied to, for example, a scroll compressor used in an air conditioning system for a vehicle such as an automobile.

1 Controller 2 Electric element 3 Compression element 4 Housing 20 Drive shaft 21 Bearing part 22 Rotor 23 Stator 41 Controller room 42 Electric element room 42a Suction room 42b Drive room 43 Compression element room 44 Partition 45 Support wall 46 Suction port 50 First Shielding wall 60 Second shielding wall 70 Heat dissipation fin 100 Scroll type compressor A Axis center

Claims (4)

An electric element with a rotor that rotates about a lateral axis that is approximately orthogonal to the direction of gravity,
A compression element driven by the electric element to compress the refrigerant, a controller for driving the electric element, and a housing for accommodating the controller, the electric element, and the compression element in this order in the axial direction. A scroll compressor equipped with,
The inside of the housing is divided into a controller chamber for accommodating the controller and an electric element chamber for accommodating the electric element, and a partition wall to which the controller is thermally connected.
The electric element chamber is divided into a suction chamber on the controller side where the refrigerant is sucked and a drive chamber on the compression element side where the rotor is arranged, and a bearing portion that supports the rotor. With a support wall,
The housing has a refrigerant suction port that communicates with the suction chamber from above.
The suction chamber is provided with a first shielding wall that shields between the suction port and the bearing portion so as to face the opening direction of the suction port.
In the first shielding wall, an end portion in a direction orthogonal to the axial center direction is connected to the inner surface of the housing, and an end portion on the compression element side in the axial center direction is connected to the support wall. The end on the controller side in the direction is located with a gap with respect to the partition wall .
Scroll type compressor. An electric element with a rotor that rotates about a lateral axis that is approximately orthogonal to the direction of gravity,
A compression element driven by the electric element to compress the refrigerant, a controller for driving the electric element, and a housing for accommodating the controller, the electric element, and the compression element in this order in the axial direction. A scroll compressor equipped with,
The inside of the housing is divided into a controller chamber for accommodating the controller and an electric element chamber for accommodating the electric element, and a partition wall to which the controller is thermally connected.
The electric element chamber is divided into a suction chamber on the controller side where the refrigerant is sucked and a drive chamber on the compression element side where the rotor is arranged, and a bearing portion that supports the rotor. With a support wall,
The housing has a suction port for a refrigerant that communicates with the suction chamber from above.
The suction chamber is provided with a first shielding wall that shields between the suction port and the bearing portion so as to face the opening direction of the suction port.
The suction chamber is provided with a second shielding wall that surrounds the bearing portion together with the first shielding wall below the first shielding wall .
Scroll type compressor. A heat radiating fin is attached to a position of the partition wall on the suction chamber side corresponding to the connection point of the controller.
The scroll compressor according to claim 1 or 2. The radiating fins are attached so as to be oblique to the direction of gravity.
The scroll type compressor according to claim 3.

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