WO2019244526A1 - Compressor - Google Patents

Abstract

A housing (1) constitutes a pressure-resistant container. An electric motor section (3) is contained in an electric motor chamber (10) formed inside the housing (1). A frame (5) is provided inside the housing (1) and is in contact with or affixed to the inner wall of the housing (1). The compression mechanism section (6) is disposed inside the housing (1) on the opposite side of the frame (5) from the electric motor section (3) and forms a compression chamber in which a volume change for compressing an operating medium is performed. A movable member (7) is in rotatable sliding contact with a bearing section (50) provided to the frame (5), and transmits torque generated by the electric motor section (3) to the compression mechanism section (6). The thermal conductivity of the housing (1) and/or the frame (5) is higher than that of the movable member (7) and is also higher than that of at least one part which constitutes the compression mechanism section (6).

Description

Compressor Cross-reference to related application

This application is based on Japanese Patent Application No. 2018-117309 filed on June 20, 2018, the disclosure of which is incorporated herein by reference.

The present disclosure relates to a compressor mounted on an air conditioner, a hot water supply, a refrigerator, and the like, and particularly relates to improvement of reliability in which lubrication of a sliding contact portion is improved by heat radiation.

Conventionally, a compressor that compresses a working medium includes a housing, a motor unit provided inside the housing, a compression mechanism unit that compresses the working medium, a movable shaft that transmits a driving force of the motor unit to the compression mechanism unit, A frame having a bearing portion for rotatably supporting the movable shaft is provided. The compression mechanism section includes a orbiting scroll that performs a revolving motion by receiving a torque of a movable shaft, a fixed scroll that forms a compression chamber together with the orbiting scroll, and the like. In this type of compressor, a lubricating oil is applied to the sliding contact portion of the sliding contact portion between the bearing portion of the frame and the movable shaft to ensure reliability without causing seizure or abnormal wear. Is supplied.

In order to suppress the seizure and abnormal wear of the sliding contact portion, there are a method of improving the wear resistance and a method of improving the oil film forming property to reach the fluid lubrication region in the sliding contact portion. The oil film forming property is related to the viscosity of the lubricant, the sliding speed, the load, and the combined surface roughness.
In order to improve seizure resistance and abrasion resistance in the sliding contact portion, a method of performing DLC coating on the sliding contact portion as described in Patent Document 1 is disclosed. DLC is an abbreviation for Diamond-Like Carbon.

Further, in order to prevent the oil film from becoming thin and causing seizure or abnormal wear in the sliding portion to reduce the reliability, in Patent Document 2, in order to suppress the temperature rise of the sliding contact portion, the sliding contact portion is formed. There is disclosed a method of increasing the surface area of the frame and providing a heat radiating portion for increasing the heat radiating area.

JP 2009-287483 A JP 2012-97575 A

In a compressor unit that compresses a working medium used in an air conditioner from a low-pressure state to a high-pressure state, and a compressor that incorporates a motor unit that is a driving source of the compressor unit, a part that generates heat inside the compressor is: An electric motor, a sliding portion of the compressor section, and a compression chamber for compressing the working medium. From the viewpoint of reliability, better reliability can be ensured by radiating the heat to the outside of the compressor early. In particular, it is important to secure an oil film of the lubricant in order to ensure the reliability of the sliding contact part of the compressor unit. Therefore, it is necessary to lower the temperature of the sliding contact part and keep the viscosity of the lubricant high. It becomes important.

維持 In the compressor, the maintenance and improvement of the heat pump capacity of the heat pump cycle, which has been increasingly used in recent years, is an indispensable item from the viewpoint of the user.

構造 The structure described in Patent Document 1 described above has excellent wear resistance of the DLC, so that the reliability of the sliding contact portion can be improved. However, DLC coating requires additional steps and DLC itself is expensive, which is disadvantageous in terms of cost.

On the other hand, in the structure described in Patent Document 2, the oil film forming property is improved by reducing the heat of the sliding contact portion by heat radiation and preventing the viscosity of the lubricant from lowering. Reliability can be improved without the need.

However, since the amount of heat transfer is determined by the temperature difference and the surface area of the heat transfer portion, particularly when the inside of the housing is a high-pressure dome, the temperature inside the housing is high, so that the frame having the sliding contact portion and the inside of the housing are not easily connected. Temperature difference is reduced, and heat dissipation is suppressed, which is disadvantageous.

Since the heat radiating portion of the sliding contact portion is inside the housing of the compressor and radiates heat to the vicinity of the sliding contact portion for which reliability is to be improved, there is a concern that heat dissipation may be reduced, and a component having the sliding contact portion Increasing the surface area is not an effective method for lowering the temperature of the sliding contact portion.

The present disclosure improves the oil film forming property of the lubricant in the sliding contact portion by radiating heat around the sliding contact portion such as frictional heat and compression heat generated in the sliding contact portion to the outside of the compression mechanism and the compressor. It is an object of the present invention to provide a compressor capable of improving reliability.

According to one aspect of the present disclosure,
In a compressor that compresses and discharges a working medium,
A housing constituting a pressure-resistant container,
A motor section housed in a motor room formed inside the housing,
A frame provided inside the housing and abutting or fixed to an inner wall of the housing,
A compression mechanism section that is arranged on the opposite side of the motor section with respect to the frame inside the housing and forms a compression chamber in which a volume change for compressing the working medium is performed;
A movable member that rotatably slidably contacts a bearing portion provided on the frame and transmits torque generated by the electric motor portion to the compression mechanism portion,
The thermal conductivity of at least one of the housing and the frame is higher than the thermal conductivity of the movable member and higher than the thermal conductivity of at least one component constituting the compression mechanism.

According to this, one aspect of the present disclosure is a configuration in which the thermal conductivity of at least one of the housing and the frame is higher than the thermal conductivity of the movable member. Therefore, heat around the sliding contact portion, such as frictional heat and compression heat generated at the sliding portion between the bearing portion of the frame and the movable member, can be efficiently transferred from the frame to the housing. Since the housing has a large heat radiation area exposed to the outside of the compressor, when heat is efficiently transferred from the frame to the housing, the heat radiation from the housing to the outside of the compressor is improved.

As a result, it is possible to reduce the temperature rise in the sliding contact portion and in the vicinity of the sliding contact portion, it is possible to suppress the decrease in the viscosity of the lubricant due to the heating of the lubricant in the sliding contact portion, it is possible to secure an oil film, and it is possible to secure the burning in the sliding contact portion. Adhesion and abnormal wear are reduced, and reliability can be improved. Further, since the power loss can be reduced by improving the reliability of the sliding contact portion, the efficiency of the entire cycle can be improved or maintained.

Further, one aspect of the present disclosure is a configuration in which the thermal conductivity of a component configuring the compression mechanism is lower than the thermal conductivity of at least one of the housing and the frame. Therefore, the heat of compression of the working medium generated in the compression chamber is insulated by the components constituting the compression mechanism, and the heat transfer to the housing and the frame is suppressed. Therefore, the gas temperature due to the compression is hardly transferred to the housing and the frame, and the discharge gas is discharged from the compressor in a high temperature state. As a result, in a heat pump cycle that has been increasingly used in recent years, a high-temperature and high-pressure discharge gas temperature can be discharged to a heat pump device system at a high temperature, and the heat pump capacity can be maintained and improved. Therefore, it is possible to achieve both improvement in reliability and improvement in capacity maintenance.

Also, according to another aspect of the present disclosure,
In a compressor that compresses and discharges a working medium,
A housing constituting a pressure-resistant container,
A motor section housed in a motor room formed inside the housing,
A frame provided inside the housing and abutting or fixed to an inner wall of the housing,
A compression mechanism section that is arranged on the opposite side of the motor section with respect to the frame inside the housing and forms a compression chamber in which a volume change for compressing the working medium is performed;
A movable member that rotatably slidably contacts a bearing portion provided on the frame and transmits torque generated by the electric motor portion to the compression mechanism portion,
The thermal conductivity of the housing and the frame is higher than the thermal conductivity of the movable member,
The thermal conductivity of the frame is higher than the thermal conductivity of at least one component constituting the compression mechanism.

According to this, another aspect of the present disclosure is a configuration in which the thermal conductivity of the housing and the frame is higher than the thermal conductivity of the movable member. Therefore, the frictional heat generated in the sliding portion between the bearing portion and the movable member of the frame and the heat around the sliding contact portion can be efficiently transferred from the sliding portion to the housing through the frame to the housing. Since the housing has a large heat radiation area exposed to the outside of the compressor, when heat is efficiently transferred from the frame to the housing, the heat radiation from the housing to the outside of the compressor is improved.

As a result, it is possible to reduce the temperature rise in the sliding contact portion and in the vicinity of the sliding contact portion, it is possible to suppress the decrease in the viscosity of the lubricant due to the heating of the lubricant in the sliding contact portion, it is possible to secure an oil film, and it is possible to secure the burning in the sliding contact portion. Adhesion and abnormal wear are reduced, and reliability can be improved. Further, since the power loss can be reduced by improving the reliability of the sliding contact portion, the efficiency of the entire cycle can be improved or maintained.

Further, another aspect of the present disclosure is a configuration in which the thermal conductivity of a component configuring the compression mechanism is lower than the thermal conductivity of the frame. Therefore, the heat of compression of the working medium generated in the compression chamber is insulated by the components constituting the compression mechanism, and the heat transfer to the frame is suppressed. Therefore, since the gas temperature due to the compression is not easily transferred to the frame, the discharge gas is discharged from the compressor in a high temperature state. As a result, in a heat pump cycle that has been increasingly used in recent years, a high-temperature and high-pressure discharge gas temperature can be discharged to a heat pump device system at a high temperature, and the heat pump capacity can be maintained and improved. Therefore, it is possible to achieve both improvement in reliability and improvement in capacity maintenance.

Note that reference numerals in parentheses attached to the respective components and the like indicate an example of the correspondence between the components and the like and specific components and the like described in the embodiments described later.

It is a sectional view of a compressor concerning a 1st embodiment. It is a sectional view showing a part of compressor concerning a 2nd embodiment. It is a sectional view showing a part of compressor concerning a 2nd embodiment. It is a sectional view showing a part of compressor concerning a 2nd embodiment. It is a sectional view showing a part of compressor concerning a 3rd embodiment. It is a sectional view showing a part of compressor concerning modification 1 of a 3rd embodiment. It is sectional drawing which shows a part of compressor which concerns on the modification 2 of 3rd Embodiment. It is sectional drawing which shows a part of compressor which concerns on the modification 3 of 3rd Embodiment. It is sectional drawing which shows a part of compressor which concerns on the modification 4 of 3rd Embodiment. It is sectional drawing which shows a part of compressor which concerns on the modification 5 of 3rd Embodiment. It is a sectional view showing some compressors concerning a 4th embodiment. It is a sectional view showing a part of compressor concerning a modification of a 4th embodiment. It is an image figure for explaining familiarity in a 4th embodiment and its modification. It is a sectional view showing a part of compressor concerning a 5th embodiment. It is sectional drawing which shows a part of compressor which concerns on the modification 1 of 5th Embodiment. It is sectional drawing which shows a part of compressor which concerns on the modification 2 of 5th Embodiment. It is a sectional view of the compressor concerning a 6th embodiment. It is sectional drawing which shows some compressors concerning 7th Embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, portions that are the same or equivalent are denoted by the same reference numerals, and description thereof is omitted.

(1st Embodiment)
A first embodiment will be described with reference to the drawings.

<Structure of compressor>
This embodiment will be described with reference to FIG. The present embodiment is a compressor that draws a working medium from a refrigeration cycle (not shown), and performs compression and discharge.

The compressor is a scroll-type electric motor compressor, which compresses a working medium sucked from a housing 1 constituting a pressure-resistant container and an intake unit 11 provided inside the housing 1 and provided in a part of the housing 1. And a motor unit 3 serving as a driving force source of the compressor unit 2. The compressor is of a horizontal type in which a housing 1, a compressor unit 2, and an electric motor unit 3 are arranged in a lateral direction (that is, a direction intersecting with the direction of gravity). An oil separator 4 that separates refrigerant and oil from the working medium compressed by the compressor unit 2 is provided outside the compressor unit 2.

The electric motor unit 3 includes a stator motor 301 fixed to the inner wall of the housing 1 and a rotor motor 302 that rotates and moves inside a radial direction of the stator motor 301. The motor unit 3 is housed in a motor room 10 formed inside the housing 1.

In the compressor unit 2, a frame 5 having a bearing unit and a compression mechanism unit 6 that forms the compressor unit 2 with the frame 5 as a part are arranged. The compressor unit 2 is rotatably slidably in contact with a bearing unit provided on the frame 5, and a movable shaft as a movable member that transmits a movable force (ie, torque) generated by the electric motor unit 3 to the compression mechanism unit 6. 7. The bearing portion of the frame 5 constitutes a sliding portion 501 between the frame 5 and the movable shaft 7.

The frame 5 is provided inside the housing 1 and is in contact with or fixed to the inner wall of the housing 1. The compression mechanism 6 is disposed inside the housing 1 on the side opposite to the electric motor 3 with respect to the frame 5. The compression mechanism 6 forms a compression chamber in which a volume change for compressing the working medium is performed.

Further, the compression mechanism unit 6 is a component that forms a compression chamber, and a orbiting scroll 601 and a component that is arranged on the opposite surface of the orbiting scroll 601 to form a fixed member of the compression mechanism unit 6 and that forms a compression chamber together with the orbiting scroll 601. And a fixed scroll 602 serving as a reference. Both the orbiting scroll 601 and the fixed scroll 602 have disk-shaped substrate portions 603 and 604. The two substrate parts 603 and 604 are arranged so as to face each other. A cylindrical boss 605 into which the lower end of the movable shaft 7 is inserted is formed at the center of the substrate 603 of the orbiting scroll 601. The lower end of the movable shaft 7 is an eccentric portion 701 eccentric with respect to the rotation center of the movable shaft 7. Therefore, the eccentric portion 701 of the movable shaft 7 is inserted into the orbiting scroll 601.

Further, between the orbiting scroll 601 and the frame 5, a rotation preventing mechanism 8 for preventing the orbiting scroll 601 from rotating around the eccentric portion 701 is provided. For this reason, when the movable shaft 7 rotates, the orbiting scroll 601 does not rotate around the eccentric part 701 but revolves around the rotation center of the movable shaft 7 while revolving.

The orbiting scroll 601 is orbitally driven by the movable shaft 7. As the orbiting scroll 601 turns, the volume of the compression chamber formed by the orbiting scroll 601 and the fixed scroll 602 repeatedly expands and contracts, whereby the working medium is sucked and compressed.

作 動 The compressed working medium flows from the working medium discharge port 606 of the compressor unit 2 to the inflow port 401 of the oil separator 4.

The oil separator 4 separates the refrigerant and the oil from the working medium discharged from the compressor unit 2 and plays a role of returning the separated oil to the inside of the housing 1. Further, a part of the oil returns to the inside of the housing 1 through the lubricating passage to be supplied to each sliding contact portion.

The oil separated by the oil separator 4 is stored in the oil storage chamber 9, passes through a lubrication path (not shown) in the compression mechanism 6, and is supplied to the boss 605 of the orbiting scroll 601, and further, the movable shaft 7 and is supplied to each sliding contact portion through a lubrication path 702 formed inside.

Next, the configuration according to the present embodiment will be described in detail.

The compressor of the present embodiment radiates heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 between the frame 5 and the movable shaft 7 to the outside of the compression mechanism portion 6 and the compressor. In addition, a decrease in the viscosity of the lubricant due to an increase in the temperature of the lubricant in the sliding contact portion 501 is suppressed, and the oil film forming property is improved. Therefore, in the compressor of the present embodiment, the heat conductivity of at least one of the housing 1 and the frame 5 is higher than that of the movable shaft 7 of the movable member, and the components constituting the compression mechanism 6 are replaced by the housing 1 and the frame. 5 is a member having a lower thermal conductivity than at least one of the members.

Accordingly, when the frame 5 has a higher thermal conductivity than the movable shaft 7, heat around the sliding contact portion 501, such as frictional heat and compression heat generated by the movable shaft 7, easily moves to the frame 5. By transferring the heat to the frame 5, heat can be dissipated using the surface of the frame 5. Therefore, heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the movable shaft 7 can be reduced.

When the housing 1 has a higher thermal conductivity than the movable shaft 7, the heat of the frame 5 heated by the heat around the sliding contact portion 501 such as frictional heat and compression heat generated by the movable shaft 7 moves to the housing 1. Easier to do. Since the housing 1 is a pressure-resistant container constituting the outer shell of the compressor, the surface thereof is in contact with the outside air, so that the heat obtained from the frame 5 can be radiated to the outside air, and the heat of the housing 1 is reduced. be able to. Accordingly, the heat of the frame 5 can be radiated to the outside air through the housing 1 by transferring the heat of the frame 5 to the housing 1, so that the heat of the frame 5 can also be reduced. Therefore, heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 of the movable shaft 7 can be reduced. Therefore, it is possible to prevent the temperature of the lubricant from increasing at the sliding contact portion 501 and lowering the viscosity of the lubricant, and it is possible to secure an oil film at the sliding contact portion 501. Is reduced, and the reliability can be improved.

When the component forming the compression chamber is a member having a lower thermal conductivity than at least one of the housing 1 and the frame 5, the gas temperature generated by the heat of the compression of the working medium is not transferred to the frame 5. The gas temperature can be maintained at a high temperature. For this reason, it is possible to prevent the discharge temperature of the working medium after compression from decreasing. As a result, in a heat pump cycle whose use is increasing in recent years, a high-temperature and high-pressure discharge gas temperature can be discharged to a heat pump device system at a high temperature, so that the heat pump capacity can be maintained and improved.

In the present embodiment, the housing 1 and the frame 5 are made of an aluminum-based material having a high thermal conductivity (for example, a thermal conductivity of about 100 to 200 W / mK in a 20 ° C. atmosphere). The movable shaft 7 of the movable member is made of an iron-based member (for example, having a thermal conductivity of about 10 to 50 W / mK in a 20 ° C. atmosphere) having a lower thermal conductivity than an aluminum-based member. Accordingly, heat transfer from the frame 5 to the housing 1 around the sliding contact portion 501, such as frictional heat and compression heat generated in the sliding contact portion 501, can be increased, and heat radiation to the outside of the compressor can be improved. .

In addition, in the present embodiment, the orbiting scroll 601 constituting the compression chamber is made of an iron-based member having a lower thermal conductivity than the aluminum-based member of the housing 1 and the frame 5. Thereby, the gas temperature generated by the heat due to the compression of the working medium can be suppressed from being transmitted to the frame 5 through the orbiting scroll 601, and the gas temperature can be maintained at a high temperature. Therefore, particularly in a heat pump cycle whose use has been increasing in recent years, it is possible to discharge the gas at a high temperature to the heat pump device system without lowering the temperature of the high-temperature and high-pressure discharge gas, so that the heat pump capacity can be maintained and improved. Therefore, it is possible to achieve both improvement in reliability and improvement in capacity maintenance. Further, by making the frame 5 of an aluminum-based material, it is possible to reduce the weight of the entire compressor.

The aluminum-based members forming the housing 1 and the frame 5 are aluminum or an alloy containing aluminum as a base. The iron-based member forming the movable shaft 7 and the orbiting scroll 601 is iron or an alloy containing iron as a base. Thereby, the thermal conductivity of the movable shaft 7 can be set to 50% or less of the thermal conductivity of at least one of the housing 1 and the frame 5. Further, the thermal conductivity of the movable shaft 7 and the orbiting scroll 601 can be set to 50% or less of the thermal conductivity of at least one of the housing 1 and the frame 5.

The compressor of the first embodiment described above has the following operational effects.
(1) In the first embodiment, at least one of the housing 1 and the frame 5 is made of a member having a higher thermal conductivity than the movable shaft 7. At least one component constituting the compression mechanism 6 is made of a member having a lower thermal conductivity than at least one of the housing 1 and the frame 5.

Since the thermal conductivity of at least one of the housing 1 and the frame 5 is higher than that of the movable shaft 7, heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 is transferred from the frame 5 to the housing 5. 1 can be transferred with high efficiency. Since the housing 1 has a large heat dissipation area exposed to the outside of the compressor, when the amount of heat transfer from the frame 5 to the housing 1 increases, the heat dissipation from the housing 1 to the outside of the compressor improves.

As a result, it is possible to reduce the temperature rise in the sliding contact portion 501 and the vicinity of the sliding contact portion 501, to suppress the decrease in the viscosity of the lubricant due to the heating of the lubricant in the sliding contact portion 501, to secure the oil film, and to make the sliding contact possible. Seizure and abnormal wear in the portion 501 are reduced, and reliability can be improved. Further, since the power loss can be reduced by improving the reliability of the sliding contact portion 501, the efficiency of the entire cycle can be improved or maintained.

Furthermore, in the first embodiment, at least one component of the compression mechanism 6 has a lower thermal conductivity than at least one of the housing 1 and the frame 5. Therefore, the compression heat of the working medium generated in the compression chamber is insulated by the components constituting the compression mechanism, and the heat transfer to the housing 1 and the frame 5 is suppressed. Therefore, the gas temperature due to the compression is difficult to transfer to the housing 1 and the frame 5, and the discharge gas is discharged from the compressor in a high temperature state. As a result, in a heat pump cycle that has been increasingly used in recent years, a high-temperature and high-pressure discharge gas temperature can be discharged to a heat pump device system at a high temperature, and the heat pump capacity can be maintained and improved. Therefore, it is possible to achieve both improvement in reliability and improvement in capacity maintenance.

(2) In the first embodiment, the housing 1 and the frame 5 are made of a member having higher thermal conductivity than the movable shaft 7, and at least one component constituting the compression mechanism 6 is the frame 5. It is composed of a member having a lower thermal conductivity than that of the first embodiment.

According to this, since the thermal conductivity between the housing 1 and the frame 5 is higher than the thermal conductivity of the movable shaft 7, heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 is reduced by the frame. 5, the heat transfer to the housing 1 having a large heat radiation area can be increased. Therefore, heat is transferred from the compression mechanism 6 to the housing 1, and the heat radiation from the housing 1 to the outside of the compressor is further improved.

Furthermore, in the first embodiment, at least one component constituting the compression mechanism 6 uses a material having a lower heat transfer coefficient than the frame 5, and the gas temperature due to the compression is not transferred to the frame 5. , Can maintain high temperature. As a result, in a heat pump cycle that has been increasingly used in recent years, a high-temperature and high-pressure discharge gas temperature can be discharged to a heat pump device system at a high temperature, and the heat pump capacity can be maintained and improved. Therefore, it is possible to achieve both improvement in reliability and improvement in capacity maintenance.

(3) In the first embodiment, the thermal conductivity of the movable shaft 7 is 50% or less of the thermal conductivity of at least one of the housing 1 and the frame 5. The thermal conductivity of the orbiting scroll 601 arranged on the frame 5 side of the components constituting the compression mechanism 6 is 50% or less of the thermal conductivity of at least one of the housing 1 and the frame 5.

Accordingly, heat around the sliding contact portion, such as frictional heat and compression heat generated at the sliding contact portion with the movable shaft 7, can transfer heat to the housing 1 or the frame 5 more than the movable shaft 7.

Since the heat transfer coefficient of the orbiting scroll 601 disposed on the frame 5 side among the components constituting the compression mechanism 6 is small, the heat of the compression heat generated in the compression chamber is transferred to at least one of the frame 5 and the housing 1. The moving amount can be reduced.

(4) In the first embodiment, the material of the housing 1 and the frame 5 is aluminum or an alloy containing aluminum as a base. The material of the orbiting scroll 601 and the movable shaft 7 which are arranged on the frame 5 side among the components constituting the compression mechanism 6 is iron or an alloy having iron as a base.

This makes it possible to make the thermal conductivity of the housing 1 and the frame 5 higher than that of the movable shaft 7. Therefore, heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 with the movable shaft 7 can transfer heat to the housing 1 or the frame 5 more than the movable shaft 7. By using the iron-based material for the orbiting scroll 601, the heat transfer coefficient can be reduced, and the heat transfer amount of the compression heat generated in the compression chamber to at least one of the frame 5 and the housing 1 can be reduced. Can be done.

(2nd Embodiment)
Next, a second embodiment will be described with reference to FIGS.

A plurality of embodiments described below show the contact portions 101 and 502 between the housing 1 and the frame 5 with respect to the first embodiment, and the other configurations are the same as those in the first embodiment. Only the parts different from the first embodiment will be described.

圧 縮 The compressor of the second embodiment is different from the first embodiment in the configuration of the part where the frame 5 and the housing 1 are in contact or fixed. That is, the portions indicated as the contact portions by arrows in FIG. 2 have the following configurations (1) and (2) regarding the surface roughness (that is, surface roughness) of the contact portions 101 and 502. ing.

(1) As shown in FIG. 3, in the housing 1, the contact portion 101 with the frame 5 has a smaller surface roughness than the surface not in contact with the frame 5. Therefore, the contact area between the housing 1 and the frame 5 can be secured even with a weak contact force. In this specification, the contact area refers to an area where two members are actually in contact with each other. Since a large contact area between the frame 5 and the housing 1 is ensured, heat transfer around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 from the frame 5 to the housing 1 can be increased. I can do it. Therefore, it is possible to suppress a decrease in the viscosity of the lubricant due to an increase in the temperature of the lubricant in the sliding contact portion 501, and to secure an oil film in the sliding contact portion 501. Is reduced, and the reliability can be improved. In the following description, in the housing 1, the fact that the contact portion 101 with the frame 5 has a smaller surface roughness than the surface that does not contact with the frame 5 may be referred to as “first requirement”.

(2) As shown in FIG. 4, in the frame 5, the contact portion 502 with the housing 1 has a smaller surface roughness than the surface not in contact with the housing 1. Also in this case, since the contact area can be secured even with a weak contact force, the same effect as the first requirement (1) can be obtained. Further, in the case of the first requirement of the above (1), when the inner diameter of the housing 1 is constant, the surface roughness is changed between the surface of the contact portion 101 and the surface that does not contact, so that it is necessary to change the processing method. Therefore, the cost may increase. On the other hand, in the frame 5, the surface roughness may be adjusted when finishing the contact portion 502, and there is no need to change or add a processing method, so that the frame 5 can be configured without increasing the cost. . In the following description, the fact that the surface roughness of the contact portion 502 of the frame 5 that contacts the housing 1 is smaller than that of the surface that does not contact the housing 1 may be referred to as a “second requirement”. .

As means for abutting or fixing in the second embodiment, there are means for shrink-fitting the housing 1 and the frame 5, means for welding, means for fixing with a bolt, and the like.

The compressor according to the second embodiment described above satisfies at least one of the above-described first and second requirements. Thereby, the surface roughness of the contact surfaces of the contact portions 101 and 502 is small and is in a good state, so that the contact area between the housing 1 and the frame 5 can be steadily secured even with a weak contact force. The heat transfer from the frame 5 to the housing 1 can be increased.

As a result, a rise in temperature due to heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 can be reduced, and a decrease in the viscosity of the lubricant due to heating of the lubricant can be suppressed, and an oil film can be secured. It becomes possible. Therefore, seizure and abnormal wear in the sliding contact portion 501 are reduced, and reliability can be improved. In addition, not only can the efficiency of the entire cycle be improved, but also the surface roughness of only the contact portions 101 and 502 can be improved, so that it is possible to cope without a significant increase in cost.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. In the third embodiment, a difference between the first embodiment and the second embodiment is that a step 110 is provided at an inner peripheral portion of the housing 1. As shown in FIG. 5, when “the outer diameter of the motor section 3” <“the outer diameter of the compressor section 2”, the step 110 provided in the housing 1 abuts on the surface of the frame 5 on the side of the motor section 3. Or it can be fixed. Therefore, since the heat of the frame 5 can be transferred to the housing 1 through the step 110, the heat dissipation of the frame 5 is improved. Therefore, heat around the sliding contact portion 501, such as frictional heat and compression heat generated in the sliding contact portion 501, can be reduced, and a decrease in the viscosity of the lubricant due to an increase in the temperature of the lubricant in the sliding contact portion 501 is suppressed. It is possible to secure oil film. Therefore, seizure and abnormal wear in the sliding contact portion 501 are reduced, and reliability can be improved.

Furthermore, since the frame 5 and the step portion 110 can be abutted or fixed, the step portion 110 can be used as the contact portions 101 and 502 for fixing the compressor unit 2 to the housing 1.

(Modification 1 of Third Embodiment)
In addition, as shown in FIG. 6, by providing the step portion 110 between the electric motor portion 3 and the frame 5, the housing 1 is not affected by the relationship between the outer diameter of the electric motor portion 3 and the outer diameter of the compressor portion 2. And the compressor unit 2 can be contacted or fixed. Then, it is possible to adopt a configuration in which the area from the step portion 110 to the motor section 3 in the motor room 10 of the housing 1 is larger than the contact area between the frame 5 and the step portion 110.

( Modifications 2 and 3 of the third embodiment)
In addition, as shown in FIGS. 7 and 8, by providing the intake path 14 in at least one of the housing 1 and the stator motor 301, the intake gas can be applied to the step 110 and the surface of the frame 5. Can be cooled. FIG. 7 shows an example in which the intake path 14 is provided in the housing 1. FIG. 8 shows an example in which the intake path 14 is provided in the stator motor 301. In each drawing, the flow of the intake gas flowing into the electric motor room 10 from the intake path 14 is indicated by an arrow A.

( Modifications 4 and 5 of Third Embodiment)
In addition, as shown in FIG. 9, the surface of the step portion 110 forming the intake path 14 on the electric motor unit 3 side has a tapered shape 1101, or as shown in FIG. 10, a tapered portion 3012 is provided on the coil end 3011 of the stator motor 301. It is also possible to implement at least one of the provisions. This makes it easier to guide the intake gas toward the frame 5, so that the heat of the frame 5 can be further cooled. Therefore, heat around the sliding contact portion 501, such as frictional heat and compression heat generated in the sliding contact portion 501, can be reduced, and it is possible to suppress a decrease in the viscosity of the lubricant due to an increase in the temperature of the lubricant, and to secure an oil film. Is possible, and the seizure and abnormal wear in the sliding contact portion 501 are reduced, and the reliability can be improved.

In the third embodiment and its modifications, the means for abutting or fixing includes means for fixing the compressor unit 2 with bolts at the step 110, and means for sandwiching the compressor unit 2 between the step 110 and other members. is there.

In the third embodiment and its modification described above, the step 110 is provided at the inner peripheral portion of the housing 1. The step portion 110 is provided with contact portions 101 and 502 that can contact or fix the step portion 110 of the housing 1 at least at a part of the end face of the frame 5 on the electric motor unit 3 side. The area from the step 110 to the electric motor 3 is larger than the contact area between the frame 5 and the step 110.

As a result, the heat radiation area of the inner peripheral surface of the housing 1 is increased, so that the heat transmitted to the frame 5 out of the heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 is reduced. Heat transfer into the inside can be increased.

(4) Since the heat transfer from the motor unit 3 to the step 110 can be reduced, the heat transfer from the frame 5 to the step 110 can be prevented from being hindered by the heat generated by the motor 3.

(4th Embodiment and its modification)
Next, a fourth embodiment is shown in FIG. 11, and a modified example thereof is shown in FIG. The fourth embodiment and its modifications are based on the second embodiment or the third embodiment. The fourth embodiment and its modification are different in that the surface roughness of the housing 1 and the frame 5 are different from each other, or that the hardness of the housing 1 and the material of the frame 5 are different from each other, or that the housing 1 and the frame 5 are different. 5 are different from each other in that the surface roughness and the hardness of the material are different from each other.

In the housing 1 and the frame 5, the contact portions 101 and 502 that come into contact with each other have different surface roughness, and when the housing 1 and the frame 5 are held with a strong contact force, the contact force becomes locally strong. A contact portion having a weak contact force with the contact portion is generated. Then, the heat transfer at the interface can be improved at the contact portion where the contact force is locally strong. Further, when the hardness of the housing 1 and the hardness of the frame 5 are different from each other, in the abutting portions 101 and 502, the member on the lower hardness side is easily adapted to the state of the contact surface of the member on the higher hardness side. Therefore, the contact area can be further increased, so that the heat transfer can be increased, and the heat dissipation can be improved. In addition, since the contact force is improved, free vibration of the frame 5 due to rotation fluctuation of the movable shaft 7 and vibration generated during the compression stroke can be reduced, so that vibration of the entire compressor can be reduced.

に お い て In the fourth embodiment and its modifications, the means for abutting or fixing includes welding, pinching, and bolt fixing means. For example, the bolt fixing has a fixing force of 4 t or more.

FIG. 13 is an image diagram for explaining familiarity. The first member 20 shown in FIG. 13 has higher hardness than the second member 30. The surface roughness of the contact surface 21 of the first member 20 is larger than the surface roughness of the contact surface 31 of the second member 30. One of the first member 20 and the second member 30 corresponds to the housing 1, and the other corresponds to the frame 5. In this case, when the first member 20 and the second member 30 are pressed against each other with a predetermined force, the contact surface 31 of the low hardness second member 30 is brought into contact with the high hardness first member 20. Elastic deformation occurs so as to conform to the state of the surface 21, and the contact area increases.

In the fourth embodiment and the modifications thereof described above, the compressor changes the surface roughness between the housing 1 and the frame 5 at the contact portions 101 and 502, or reduces the hardness of the material between the housing 1 and the frame 5. It does at least one of the changes. Accordingly, when the compressor unit 2 is held with a strong contact force, the hardness and the surface roughness of the housing 1 and the frame 5 are changed to locally strong contact at the contact portions 101 and 502. A contact portion having a weak contact force with the portion is generated, and the heat transfer property of the interface is improved by a locally strong contact portion. In addition, elastic deformation occurs at a locally strong contact portion, and microscopically, undulation occurs at the contact surface of the contact portion, and the contact area increases. Therefore, heat transfer increases because the contact area can be increased. As a result, the heat radiation area on the inner periphery of the housing 1 increases, and the temperature rise near the sliding contact portion 501 and the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 can be reduced. A decrease in the viscosity of the lubricant due to an increase in the temperature of the lubricant can be suppressed, and an oil film can be secured. Therefore, seizure and abnormal wear in the sliding contact portion 501 are reduced, and reliability can be improved.

In addition, since the contact force can be improved, free vibration of the frame 5 is limited, so that vibration can be reduced.

(Fifth Embodiment and Modified Examples 1 and 2)
FIG. 14 shows a fifth embodiment, FIG. 15 shows a first modification, and FIG. 16 shows a second modification. In the fifth embodiment and its first and second modifications, the intake unit 11 is arranged near the electric motor unit 3. When the surface position on the radially outer side of the frame 5 and at least a part of the opening of the intake section 11 are in a position overlapping in a direction perpendicular to the rotation axis of the movable shaft 7, the intake gas is applied to the frame 5. And the frame 5 can be cooled. Therefore, it is possible to reduce heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501, and it is possible to secure an oil film of the lubricant in the sliding contact portion 501. And the abrasion and abnormal abrasion in the above are reduced, and the reliability can be improved.

When the frame 5 is cooled by the intake gas, the heat transfer from the frame 5 into the electric motor room 10 increases, and the intake gas is heated, so that the density of the intake gas decreases and the intake air in the compression chamber is reduced. There is a concern that the mass will decrease and the volume efficiency will decrease. However, since the temperature of the entire compression chamber can be reduced, there is a possibility that the compression efficiency of the compressor can be improved. Also, in the present embodiment, as a component forming the compression chamber, a material having a lower heat transfer coefficient than at least one of the housing 1 and the frame 5 is used. Therefore, in a heat pump cycle that has been increasingly used in recent years, a high-temperature and high-pressure discharge gas temperature can be discharged to a heat pump device system at a high temperature, and the heat pump capacity can be maintained and improved.

は In the compressor according to the fifth embodiment described above, the electric motor room 10 of the housing 1 has the intake pressure. The intake unit 11 is provided so as to supply a working medium to a space between the electric motor unit 3 and the frame 5 in the electric motor room 10.

This makes it possible to lower the ambient temperature near the frame 5 of the motor room 10 and the temperature of the surface of the frame 5 near the motor room 10. Therefore, by increasing the temperature difference between the ambient temperature near the frame 5 side of the motor room 10 and the temperature of the frame 5 in the motor room 10, heat transfer from the frame 5 to the motor room 10 is promoted, and The heat transfer to 10 can also be increased.

As a result, heat transfer from the interior of the motor room 10 to the housing 1 increases, and the heat radiation of the entire housing 1 can be further improved. Therefore, it is possible to reduce temperature rise near the sliding contact portion 501 and the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501, and decrease in viscosity of the lubricant due to the temperature rise of the lubricant in the sliding contact portion 501. It is possible to suppress the oil film and secure the oil film. Therefore, seizure and abnormal wear in the sliding contact portion 501 are reduced, and reliability can be improved.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIG. In the sixth embodiment, the protrusions 12 are provided on the housing 1 as heat radiating portions. One or more protrusions 12 are provided on the outer wall of the housing. The contact portions 101 and 502 between the housing 1 and the frame 5 and at least a part of the protruding portion 12 are provided at positions overlapping the direction perpendicular to the rotation axis of the movable shaft 7. Therefore, the projections 12 can serve as radiation fins at the contact portions 101 and 502 where heat transfer is large, and the heat radiation of the entire housing 1 can be further improved.

Further, by making at least one of the protrusions 12 as a part of a connection portion with the outside for holding and fixing the compressor, the amount of heat transfer to the outside can be increased, and the heat radiation of the entire housing 1 can be improved. Can be further improved. Therefore, it is possible to reduce heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501, and it is possible to secure an oil film of the lubricant in the sliding contact portion 501. And the abrasion and abnormal abrasion in the above are reduced, and the reliability can be improved.

For the connection part with the outside which holds and fixes the compressor, there are cases where organic material connection parts such as rubber are usually used.However, when organic material such as rubber is adopted, it may be used depending on the ambient temperature. The hardness of the equipment changes, and the spring constant changes. As a result, the exciting force of the air conditioner for holding and fixing the compressor on the outdoor unit or the gantry of the vehicle changes, and the noise generated from the gantry changes, which may increase the noise level. Therefore, by forming the protrusion 12 as a part of the connection portion with the outside, the temperature of the connection portion component becomes a stable temperature equivalent to that of the protrusion 12, so that a constant spring constant is obtained and the vibration force applied to the gantry is increased. Becomes stable. For this reason, conventionally, when the connecting part is made of an organic material, long-term reliability may be insufficient at a high temperature.However, in the present embodiment, since the internal material has a low-pressure specification, the organic material has a high-pressure side. Since a high temperature can be suppressed, the reliability does not decrease significantly.

圧 縮 In the compressor of the sixth embodiment described above, the protrusion 12 is provided on the outer wall of the housing 1 as a heat radiating part. One or more protrusions 12 are provided on the outer wall of the housing. The contact portions 101 and 502 between the housing 1 and the frame 5 and at least a part of the protrusion 12 are provided so as to overlap in a direction perpendicular to the rotation axis of the movable shaft 7. This can be rephrased as that the contact portions 101 and 502 between the housing 1 and the frame 5 and at least a part of the protrusion 12 are provided so as to overlap with each other at the axial position of the frame 5.

Thus, it is possible to increase the heat radiation area of the housing 1 by the protrusions 12. Further, by making the contact portions 101 and 502 and at least a part of the protruding portion 12 overlap at the axial position of the frame 5, the housing 1 is positioned at a position where heat transfer from the frame 5 in the housing 1 is large. Can increase the heat radiation area.

結果 As a result, the heat radiation of the entire housing 1 can be further improved, and the temperature rise near the sliding contact portion 501 and the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 can be reduced. Therefore, a decrease in the viscosity of the lubricant due to an increase in the temperature of the lubricant in the sliding contact portion 501 can be suppressed, and an oil film can be secured. Therefore, seizure and abnormal wear in the sliding contact portion 501 are reduced, and reliability can be improved.

In the compressor according to the sixth embodiment, at least one of the protrusions 12 forms a part of a connection portion for holding and fixing the compressor to an external member, so that heat radiation to the external member is also reduced. Possible and increase the amount of heat transfer. The influence of the ambient temperature on the temperature of the connection part is reduced, and the temperature of the connection part can be set to a stable temperature equivalent to that of the protruding portion 12, so that the spring constant of the organic material connection part can be reduced. It can be stabilized.

(Seventh embodiment)
A seventh embodiment will be described with reference to FIG. In the seventh embodiment, the thrust load generated by the compression of the working medium by the compression mechanism 6 is applied between the frame 5 and the orbiting scroll 601 as compared with the first to sixth embodiments described above. The difference is that the thrust bearing member 13 is provided as a separate member. In FIG. 18, the thrust bearing member 13 is composed of two thrust bearing members 131 and 132, but the number of thrust bearing members 13 may be one or more. In addition to the effects of the first to sixth embodiments, by providing the thrust bearing member 13 as a separate member, an interface is formed between the orbiting scroll 601 and the frame 5, so that the compression heat generated in the compression chamber is swirled. The transfer of heat from the scroll 601 to the frame 5 can be divided. Therefore, the sliding contact portion 501 can reduce the influence of the compression heat on the lubricant. Further, when a plurality of thrust bearing members 13 are configured, one of the plurality of thrust bearing members 13 has a substantially annular sliding contact surface at a portion that comes into sliding contact with the other. By forming a groove between the substantially annular sliding contact surfaces, the oil film forming property on the sliding contact surface can be improved, and the reliability can be further improved.

は In the seventh embodiment described above, the thrust bearing member 13 is disposed between the frame 5 and the compression mechanism 6. Thereby, since the heat radiation can be improved while further improving the reliability of the movable shaft 7, the seizure and abnormal wear in the sliding contact portion 501 are reduced, and the reliability can be improved. Then, by forming the thrust bearing member 13 as a separate member, an interface is formed between the compression chamber and the thrust bearing member 13, so that the compression heat generated in the compression chamber can be divided, and the influence of the compression heat can be reduced. In addition, the fixing method of the thrust bearing member 13 is given a degree of freedom in the thrust direction with the components constituting the compression chamber, so that the influence of the interface can be increased and the heat insulating property can be secured. Thereby, the influence of the heat of compression can be minimized, and the reliability can be improved.

(Eighth embodiment)
The eighth embodiment differs from the first to seventh embodiments in that the working medium is carbon dioxide. Since carbon dioxide generally has a low heat transfer coefficient, when the electric motor room 10 has an intake pressure, the amount of heat transfer of the frame 5 to the intake gas becomes small. However, there is an advantage that high-temperature heating can be performed with high efficiency by operating in a cycle in which the high pressure side is in a supercritical state. Therefore, in a heat pump cycle whose use is increasing year by year, it is possible to discharge a high-temperature and high-pressure discharge gas temperature to a heat pump device system at a high temperature, and it is possible to maintain and improve the heat pump capacity.

Further, in the present embodiment, as described in the first to seventh embodiments, since the heat dissipation is improved by the frame 5 or the housing 1, the reliability of the sliding contact portion 501 can be improved. Therefore, it is possible to achieve both improvement in reliability and improvement in capacity maintenance.

The compressor according to the eighth embodiment described above is employed in a refrigeration cycle using carbon dioxide as a working medium. Even when carbon dioxide having a relatively small heat transfer coefficient is used as the working medium, heat around the sliding contact portion 501 such as frictional heat and compression heat generated in the sliding contact portion 501 is transferred from the frame 5 to the housing 1 having a large surface area. Thus, heat can be sufficiently radiated from the housing 1 to the outside. Therefore, reliability such as seizure resistance and wear resistance of the movable shaft 7 can be improved.

(Other embodiments)
In each of the embodiments described above, the compressor adopts the scroll type compression mechanism 6. However, the present disclosure is not limited to this, and for example, the compression mechanism 6 may be a vane type or a rotary type. May be adopted. Further, the oil separator 4 only needs to have a function of separating the lubricating oil from the compressed refrigerant, and may be disposed inside the compressor unit 2.

The present disclosure is not limited to the above-described embodiment, and can be appropriately modified. The above embodiments are not irrelevant to each other, and can be appropriately combined unless a combination is clearly not possible. In each of the above embodiments, it is needless to say that elements constituting the embodiments are not necessarily essential, unless otherwise clearly indicated as essential or in principle considered to be clearly essential. No. In each of the above embodiments, when a numerical value such as the number, numerical value, amount, range, or the like of the constituent elements of the exemplary embodiment is mentioned, it is particularly limited to a specific number when it is clearly stated that it is essential and in principle The number is not limited to the specific number unless otherwise specified. Further, in each of the above embodiments, when referring to the shape of components and the like, the positional relationship, and the like, unless otherwise specified and in principle limited to a specific shape, positional relationship, etc., the shape, It is not limited to a positional relationship or the like.

(Summary)
According to a first aspect described in part or all of the above-described embodiments, a compressor that compresses and discharges a working medium includes a housing, an electric motor unit, a frame, a compression mechanism unit, and a movable member. The housing constitutes a pressure vessel. The motor unit is housed in a motor room formed inside the housing. The frame is provided inside the housing and abuts or is fixed on an inner wall of the housing. The compression mechanism is disposed inside the housing on the opposite side to the electric motor with respect to the frame, and forms a compression chamber in which a volume change for compressing the working medium is performed. The movable member rotatably slides on a bearing provided on the frame, and transmits torque generated by the electric motor to the compression mechanism. The thermal conductivity of at least one of the housing and the frame is higher than the thermal conductivity of the movable member, and higher than the thermal conductivity of at least one component constituting the compression mechanism.

According to a second aspect, a compressor that compresses and discharges a working medium includes a housing, an electric motor unit, a frame, a compression mechanism unit, and a movable member. The housing constitutes a pressure vessel. The motor unit is housed in a motor room formed inside the housing. The frame is provided inside the housing and abuts or is fixed on an inner wall of the housing. The compression mechanism is disposed inside the housing on the opposite side to the electric motor with respect to the frame, and forms a compression chamber in which a volume change for compressing the working medium is performed. The movable member rotatably slides on a bearing provided on the frame, and transmits torque generated by the electric motor to the compression mechanism. The heat conductivity of the housing and the frame is higher than the heat conductivity of the movable member, and the heat conductivity of the frame is higher than the heat conductivity of at least one component constituting the compression mechanism.

According to the third aspect, the thermal conductivity of the movable member is 50% or less of the thermal conductivity of at least one of the housing and the frame. Among the components constituting the compression mechanism, the components arranged on the frame side have a thermal conductivity of 50% or less of the thermal conductivity of at least one of the housing and the frame.

According to this, since the thermal conductivity between the housing and the frame is higher than that of the movable member, heat around the sliding contact portion, such as frictional heat and compression heat generated at the sliding contact portion, is transferred to the frame, and the housing having a large heat radiation area. Heat transfer can be increased. Therefore, heat is transferred from the compression mechanism to the housing, and the heat radiation from the housing to the outside of the compressor is further improved.

Further, in a third aspect, of the components constituting the compression chamber, a material having a smaller heat transfer coefficient than that of the frame or the housing is used for a component close to the frame, and the gas temperature due to the compression is reduced by at least one of the frame and the housing. The amount of heat transfer to the substrate can be reduced. Therefore, heat radiation can be suppressed, and the gas temperature can be maintained at a high temperature. As a result, in a heat pump cycle that has been increasingly used in recent years, a high-temperature and high-pressure discharge gas temperature can be discharged to a heat pump device system at a high temperature, and the heat pump capacity can be maintained and improved. Therefore, it is possible to achieve both improvement in reliability and improvement in capacity maintenance.

According to a fourth aspect, the housing and the frame are made of aluminum or an alloy based on aluminum. Of the components constituting the compression mechanism, the components arranged on the frame side and the movable member are iron or an alloy based on iron.

This makes it possible to make the thermal conductivity of the housing and the frame higher than that of the movable member. As a result, heat around the sliding contact portion, such as frictional heat and compression heat generated at the sliding contact portion with the movable member, can be transferred to the frame and the housing having higher thermal conductivity than the movable member. Can be made even larger. The heat transfer coefficient can be reduced by using the iron-based material as the component close to the frame among the components constituting the compression chamber. Therefore, the gas temperature due to the compression generated in the compression chamber can reduce the amount of heat transfer to at least one of the frame and the housing, so that heat radiation can be suppressed, and the gas temperature can be maintained at a high temperature. I can do it. As a result, in a heat pump cycle that has been increasingly used in recent years, a high-temperature and high-pressure discharge gas temperature can be discharged to a heat pump device system at a high temperature, and the heat pump capacity can be maintained and improved. Therefore, it is possible to achieve both improvement in reliability and improvement in capacity maintenance.

According to the fifth aspect, the surface roughness of the part of the housing that is in contact with or fixed to the frame is smaller than the surface roughness of at least a part of the housing that is not in contact with or fixed to the frame. Smallness is called a first requirement. The second requirement is that the surface roughness of a portion of the frame that is in contact with or fixed to the housing is smaller than the surface roughness of at least a portion of the frame that is not in contact with or fixed to the housing. Call. At this time, the compressor satisfies at least one of the first requirement and the second requirement.

This makes it possible to steadily secure the contact area even with a weak contact force, and to increase the heat transfer from the frame to the housing. As a result, it is possible to reduce temperature rise due to heat around the sliding contact portion such as frictional heat and compression heat generated at the sliding contact portion, and it is possible to suppress a decrease in the viscosity of the lubricant due to heating of the lubricant, and it is possible to secure an oil film. In addition, seizure and abnormal wear at the sliding contact portion are reduced, and the reliability can be improved. In addition, not only the efficiency of the entire cycle can be improved, but also the surface roughness of only the contact portion can be improved, so that it is possible to cope without a large increase in cost.

According to the sixth aspect, a step portion is provided in the inner peripheral portion of the housing, and at least a part of the end face of the frame on the motor portion side is provided with a contact portion capable of contacting or fixing the step portion of the housing. I have. The area from the step to the motor is larger than the contact area between the frame and the step.

As a result, the heat dissipating area on the inner periphery of the housing is increased, and of the heat, such as frictional heat and compression heat generated in the sliding contact portion, around the sliding contact portion, the heat transferred to the frame also increases the heat transfer into the motor chamber. It becomes possible.

According to the seventh aspect, a difference between the surface roughness of the housing and the surface roughness of the frame at a position where the housing and the frame are in contact with or fixed to each other is called a surface roughness requirement. The difference between the hardness and the hardness of the frame is called a hardness requirement. At this time, the compressor satisfies at least one of the surface roughness requirement and the hardness requirement.

Thereby, when the compressor section is held with a strong contact force, the hardness and the surface roughness of the housing and the frame are changed so that the local strong contact portion and the weak contact force are formed at the contact portion. A contact portion is generated, and the heat transfer property of the interface is improved by a locally strong contact portion. Further, elastic deformation occurs at a locally strong contact portion, and microscopically, undulation occurs at the contact surface of the contact portion, and the contact area increases. Therefore, since the contact area can be increased, heat transfer increases. As a result, the heat dissipating area on the inner periphery of the housing is increased, so that the temperature rise in the sliding contact portion and the vicinity of the sliding contact portion such as frictional heat and compression heat generated in the sliding contact portion can be reduced, and the temperature rise of the lubricant in the sliding contact portion This makes it possible to suppress a decrease in the viscosity of the lubricant due to this, and to secure an oil film. Therefore, seizure and abnormal wear at the sliding contact portion are reduced, and reliability can be improved.

In addition, since the contact force can be improved, the free vibration of the frame is limited, so that the vibration can be reduced.

According to the eighth aspect, the compressor further includes an intake unit that supplies a working medium to a space between the motor unit and the frame in the motor room.

This makes it possible to reduce the ambient temperature near the motor room side of the frame in the motor room by setting the pressure in the motor room of the housing as the intake pressure and the position of the intake from the outside of the compressor near the motor unit. It becomes. Therefore, the temperature difference between the ambient temperature near the frame of the motor room and the temperature of the frame in the motor room is increased, heat transfer from the frame to the motor room is promoted, and heat transfer from the frame to the motor room is also increased. It is possible to do.

As a result, heat transfer from the motor room to the housing increases, and the heat radiation of the entire housing can be further improved. Therefore, it is possible to reduce the temperature rise near the sliding contact portion and the sliding contact portion such as frictional heat and compression heat generated in the sliding contact portion, and it is possible to suppress the decrease in the viscosity of the lubricant due to the temperature rise of the lubricant in the sliding contact portion, An oil film can be secured. Therefore, seizure and abnormal wear at the sliding contact portion are reduced, and reliability can be improved.

す る と If heat transfer from the frame to the motor chamber is increased, the intake gas is heated, and there is a concern that the intake mass of the compression chamber is reduced and the volume efficiency is reduced. However, since the temperature of the entire compression chamber can be reduced, the compression efficiency of the compressor may be improved.

According to the ninth aspect, the compressor further includes a projection provided on an outer wall of the housing. The portion where the housing and the frame are in contact with or fixed to each other, and the protrusion are provided at positions overlapping the direction perpendicular to the rotation axis of the movable member.

Accordingly, the housing is provided with a projection as a heat radiating portion on the outer peripheral portion of the housing, and one or more protrusions are provided such that the projection of the heat radiating portion overlaps at least a part of the projection at the axial position of the frame. Can increase the heat radiation area. Furthermore, by making the contact portion between the housing and the frame overlap at least a part of the protrusion at the axial position of the frame, the heat radiation area of the housing at a position in the housing where heat transfer from the frame is large. Can be increased.

As a result, the heat radiation of the entire housing can be further improved, so that the temperature rise near the sliding contact portion and the vicinity of the sliding contact portion such as frictional heat and compression heat generated at the sliding contact portion can be reduced. Therefore, a decrease in the viscosity of the lubricant due to a rise in the temperature of the lubricant in the sliding contact portion can be suppressed, and an oil film can be secured. Therefore, seizure and abnormal wear at the sliding contact portion are reduced, and reliability can be improved.

According to a tenth aspect, at least one of the protrusions is used to fix the compressor to a member external to the compressor. Thereby, heat can be dissipated to the connection member, and the amount of heat transfer increases. The influence of the ambient temperature on the temperature of the connection part can be reduced, and the temperature of the connection part can be stabilized, so that the spring constant of the connection part made of an organic material can be stabilized. In some cases, an organic material-based component such as rubber is used for a connection portion with the outside that holds and fixes the compressor. When an organic material is used for the connection part, the hardness of the organic material changes depending on the ambient temperature, and the spring constant changes. As a result, the exciting force of the air conditioner for holding and fixing the compressor on the outdoor unit or the gantry of the vehicle changes, and the noise generated from the gantry changes, which may increase the noise level. Therefore, by making the protruding part a part of the connecting part with the outside, the temperature of the connecting part becomes stable temperature equivalent to that of the protruding part, so it has a constant spring constant and stable excitation force to the gantry I do. For this reason, conventionally, when the connection parts are made of an organic material, long-term reliability may not be sufficient at high temperatures, but in the present embodiment, since the internal material has a low pressure specification, the organic material has a high-pressure side. Since a high temperature can be suppressed, the reliability does not decrease significantly.

According to the eleventh aspect, the compressor further includes a thrust bearing member disposed between the frame and the compression mechanism. Thereby, since the heat radiation can be improved while further improving the reliability of the movable portion, the seizure and abnormal wear in the sliding contact portion are reduced, and the reliability can be improved. Then, by forming the thrust bearing member as a separate member, an interface is formed between the compression chamber and the thrust bearing member, the compression heat generated in the compression chamber can be divided, and the influence of the compression heat can be reduced. In addition, the method of fixing the thrust bearing member is given a degree of freedom in the thrust direction with the components constituting the compression chamber, so that the influence of the interface can be increased and the heat insulation can be secured. Thereby, the influence of the heat of compression can be minimized, and the reliability can be improved.

According to the twelfth aspect, the compressor is employed in a refrigeration cycle using carbon dioxide as a working medium. According to this, even when carbon dioxide having a relatively small heat transfer coefficient is used as the working medium, heat around the sliding contact portion such as frictional heat and compression heat generated at the sliding contact portion is transferred from the frame to the housing having a large surface area. As a result, heat can be sufficiently radiated from the housing to the outside. Therefore, reliability such as seizure resistance and abrasion resistance of the movable member can be improved.

Note that the configurations described in the third to twelfth aspects can be combined with any of the configurations of the first aspect and the second aspect.

Claims (12)

1. In a compressor that compresses and discharges a working medium,
   A housing (1) constituting a pressure-resistant container;
   A motor unit (3) housed in a motor room (10) formed inside the housing;
   A frame (5) provided inside the housing and abutting or fixed to an inner wall of the housing;
   A compression mechanism part (6) disposed on the opposite side of the electric motor part with respect to the frame inside the housing and forming a compression chamber in which a volume change for compressing a working medium is performed;
   A movable member (7) rotatably slidingly contacting a bearing portion (501) provided on the frame and transmitting torque generated by the electric motor portion to the compression mechanism portion;
   The compressor, wherein a thermal conductivity of at least one of the housing and the frame is higher than a thermal conductivity of the movable member and higher than a thermal conductivity of at least one component constituting the compression mechanism.
2. In a compressor that compresses and discharges a working medium,
   A housing (1) constituting a pressure-resistant container;
   A motor unit (3) housed in a motor room (10) formed inside the housing;
   A frame (5) provided inside the housing and abutting or fixed to an inner wall of the housing;
   A compression mechanism part (6) disposed on the opposite side of the electric motor part with respect to the frame inside the housing and forming a compression chamber in which a volume change for compressing a working medium is performed;
   A movable member (7) rotatably slidingly contacting a bearing portion (501) provided on the frame and transmitting torque generated by the electric motor portion to the compression mechanism portion;
   The thermal conductivity of the housing and the frame is higher than the thermal conductivity of the movable member,
   The compressor, wherein a thermal conductivity of the frame is higher than a thermal conductivity of at least one component constituting the compression mechanism.
3. A thermal conductivity of the movable member is 50% or less of a thermal conductivity of at least one of the housing and the frame;
   Of the components (601, 602) constituting the compression mechanism, the component (601) arranged on the frame side has a thermal conductivity of 50% or less of the thermal conductivity of at least one of the housing and the frame. The compressor according to claim 1 or 2.
4. The housing and the frame are aluminum or an alloy based on aluminum,
   The compressor according to any one of claims 1 to 3, wherein a component disposed on the frame side and the movable member among components configuring the compression mechanism unit are iron or an alloy having iron as a base. .
5. The surface roughness of a part (101) of the housing that is in contact with or fixed to the frame is smaller than the surface roughness of at least a part of the part of the housing that is not in contact with or fixed to the frame. This is called the first requirement,
   The surface roughness of a portion (502) of the frame that is in contact with or fixed to the housing is smaller than the surface roughness of at least a portion of the frame that is not in contact with or fixed to the housing. When this is called the second requirement,
   The compressor according to any one of claims 1 to 4, wherein at least one of the first requirement and the second requirement is satisfied.
6. A step portion (110) is provided on an inner peripheral portion of the housing, and contact portions (101, 502) are provided on at least a part of an end face of the frame on the side of the electric motor portion so that the step portion can contact or be fixed to the step portion. The structure according to any one of claims 1 to 5, wherein an area from the step portion to the electric motor portion is larger than a contact area between the frame and the step portion. Compressor.
7. At a place where the housing and the frame are in contact with or fixed to each other, a difference between the surface roughness of the housing and the surface roughness of the frame is referred to as a surface roughness requirement. The compressor according to claim 5, wherein at least one of the surface roughness requirement and the hardness requirement is satisfied when the difference in hardness of the frame is referred to as a hardness requirement.
8. The compressor according to any one of claims 1 to 7, further comprising an intake unit (11) that supplies a working medium to a space between the motor unit and the frame in the motor room.
9. A projection (12) provided on an outer wall of the housing,
   9. The device according to claim 1, wherein the portion where the housing and the frame are in contact with or fixed to each other and the protrusion are provided at positions overlapping in a direction perpendicular to a rotation axis of the movable member. 10. The compressor according to any one of the above.
10. The compressor according to claim 9, wherein at least one of the protrusions is used for fixing the compressor to a member external to the compressor.
11. The compressor according to any one of claims 1 to 10, further comprising a thrust bearing member (13) disposed between the frame and the compression mechanism.
12. The compressor according to any one of claims 1 to 11, wherein the compressor is employed in a refrigeration cycle using carbon dioxide as a working medium.

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