CN110621881A - Compressor with a compressor housing having a plurality of compressor blades - Google Patents
Compressor with a compressor housing having a plurality of compressor blades Download PDFInfo
- Publication number
- CN110621881A CN110621881A CN201880031768.1A CN201880031768A CN110621881A CN 110621881 A CN110621881 A CN 110621881A CN 201880031768 A CN201880031768 A CN 201880031768A CN 110621881 A CN110621881 A CN 110621881A
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- CN
- China
- Prior art keywords
- case
- housing
- scroll
- compressor
- refrigerant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
- F04C29/045—Heating; Cooling; Heat insulation of the electric motor in hermetic pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2251/00—Material properties
- F05C2251/04—Thermal properties
- F05C2251/048—Heat transfer
Abstract
The mass flow rate of the discharged fluid is suppressed or prevented from decreasing. A compressor (100) comprises: a housing (10) extending in one direction; an inner housing (40) disposed between a suction chamber (H1) formed at one end side in the casing (10) and a discharge chamber (H2) formed at the other end side in the casing (10); and a movable scroll (3) as a compression mechanism part, which is provided in the inner casing (40), compresses a fluid introduced into the suction chamber (H1), and discharges the compressed fluid to the discharge chamber (H2). The housing (10) comprises: a front case (11) having an inner wall surface (W1) exposed to the suction chamber (H1); a rear case (13) having an inner wall surface (W2) exposed to the discharge chamber (H2); and a middle case (12) that connects the front case (11) and the rear case (13) and has a thermal conductivity lower than that of the rear case (13).
Description
Technical Field
The present invention relates to a compressor that compresses and discharges a fluid such as a refrigerant.
Background
As such a compressor, for example, a compressor described in patent document 1 is generally known. The compressor described in patent document 1 is a scroll compressor incorporated in a refrigerant circuit of an air conditioner mounted on a vehicle, and compresses and discharges a refrigerant in the refrigerant circuit. The compressor includes a fixed scroll, a movable scroll, and a fixed block having a stepped cylindrical shape in a casing, compresses a low-temperature refrigerant (gas refrigerant) introduced into a suction chamber, and discharges the compressed refrigerant to the outside via a discharge chamber, wherein the casing includes a bottomed cylindrical front shell and a lid-shaped rear shell, and the rear shell closes an opening end of the front shell. Specifically, the fixed scroll is composed of a base plate formed in a bottomed cylindrical shape and a spiral wall provided so as to protrude inside the base plate. The movable scroll is provided in a space formed by abutting the fixed scroll and the fixed block against each other. The suction chamber is formed in the front housing, and the discharge chamber is formed between the rear housing and the base wall of the fixed scroll.
In other words, in the compressor described in patent document 1, a compression mechanism portion of a refrigerant including the movable scroll is provided in an inner casing formed by the base plate of the fixed scroll and the fixed block, the suction chamber is formed on one end portion side (the front casing side) in the casing, the discharge chamber is formed on the other end portion side (the rear casing side) in the casing, the inner casing is disposed between the suction chamber and the discharge chamber in the casing, the rear casing has an inner wall surface exposed to the discharge chamber, and the front casing has an inner wall surface exposed to the suction chamber.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2015-38327
Disclosure of Invention
Technical problem to be solved by the invention
In addition, CO is sometimes used2Refrigeration systemThe agent serves as a refrigerant for the air conditioner. In this case, the working pressure in the compressor becomes significantly higher than that of a conventional refrigerant such as R134a, and the pressure and temperature of the compressed refrigerant flowing through the discharge chamber become significantly higher.
However, in the compressor described in patent document 1, the rear shell having the inner wall surface exposed to the discharge chamber through which the high-temperature refrigerant flows is coupled to the front shell having the inner wall surface exposed to the suction chamber through which the low-temperature refrigerant is introduced. Therefore, the heat of the refrigerant in the discharge chamber is transferred from the inner wall surface of the rear shell into the member of the rear shell, and then transferred from the inner wall surface of the front shell into the suction chamber through the member of the front shell. As a result, the refrigerant in the suction chamber expands, the mass flow rate of the refrigerant entering the compression mechanism decreases, and the mass flow rate of the refrigerant flowing through the refrigerant circuit of the air conditioner decreases. Therefore, the cooling capacity of the air conditioner may be reduced. That is, the heat of the refrigerant in the discharge chamber is transferred to the refrigerant in the suction chamber via the casing, and the mass flow rate of the refrigerant discharged from the compressor may be reduced. The above-described technical problem is similarly caused in other types of compressors such as a vane compressor, a compressor that compresses a compressible fluid other than a refrigerant, and the like.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a compressor capable of suppressing or preventing a decrease in the mass flow rate of a discharged fluid due to heat transfer from a refrigerant in a discharge chamber to a refrigerant in a suction chamber.
Technical scheme for solving technical problem
A compressor of an aspect of the present invention includes: a housing extending in one direction; an inner housing disposed between a suction chamber formed on one end side in the casing and a discharge chamber formed on the other end side in the casing; and a compression mechanism unit that is provided in the inner case, compresses the fluid introduced into the suction chamber, and discharges the compressed fluid to the discharge chamber. The housing includes: a first housing portion having an inner wall surface exposed to the suction chamber; a second housing section having an inner wall surface exposed to the discharge chamber; and an intermediate case part connecting between the first case part and the second case part and having a thermal conductivity lower than that of the second case part.
Effects of the invention
In the compressor according to the above-described one aspect, the first casing section having the inner wall surface exposed to the suction chamber and the second casing section having the inner wall surface exposed to the discharge chamber in the casing are connected by an intermediate casing section having a lower thermal conductivity than that of the second casing section. That is, the case has a structure in which the intermediate case portion having higher thermal insulation than the second case portion is sandwiched between the second case portion on the high temperature side and the second case portion on the low temperature side. In the case, even if the heat of the fluid in the discharge chamber is transmitted to the inside of the member of the second case section through the inner wall surface of the second case section, the heat transfer from the second case section to the first case section can be suppressed or prevented by the intermediate case section. As a result, expansion of the fluid in the suction chamber due to heat transfer from the second casing section to the first casing section can be suppressed or prevented, and a decrease in the mass flow rate of the fluid discharged from the compressor can be suppressed or prevented.
Thus, the compressor according to the above aspect can suppress or prevent the mass flow rate of the discharged fluid from being lowered by heat transfer from the second casing section to the first casing section.
Drawings
Fig. 1 is a schematic sectional view of a compressor according to an embodiment of the present invention.
Fig. 2 is a partial sectional view of the compressor.
Fig. 3 is a partial sectional view showing a modification of the compressor.
Detailed Description
[ means for carrying out the invention ]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Fig. 1 is a schematic sectional view of a compressor according to an embodiment of the present invention.
The compressor 100 of the present embodiment is a scroll compressor incorporated in a refrigerant circuit of an air conditioning apparatus installed in a vehicle, for example, and compresses and discharges a refrigerant (gas refrigerant) sucked from a low-pressure side of the refrigerant circuit. The compressor 100 is a so-called inverter-integrated electric compressor, and includes: a scroll unit 1, the scroll unit 1 compressing a refrigerant; a housing 10; an electric motor 20, the electric motor 20 driving the scroll unit 1; and an inverter 30, the inverter 30 controlling a voltage applied to the electric motor 20. In the present embodiment, the inverter 30 corresponds to a "motor drive circuit" of the present invention. In the present embodiment, the refrigerant is a compressible fluid, i.e., CO2The case of the refrigerant will be described as an example.
The above-described scroll unit 1 has a fixed scroll 2 and a movable scroll 3 which are engaged with each other. The fixed scroll 2 has: a disk-shaped bottom plate 2 a; and a scroll wrap 2b protrudingly provided on the base plate 2 a. Orbiting scroll 3 has: a disk-shaped bottom plate 3 a; and a scroll wrap 3b protrudingly provided on the base plate 3 a.
Fixed scroll 2 and orbiting scroll 3 are arranged such that scroll wrap 2b of fixed scroll 2 and scroll wrap 3b of orbiting scroll 3 are engaged with each other. Specifically, the fixed scroll 2 and the movable scroll 3 are arranged such that: the end edge of the orbiting scroll 2b on the protruding side of the fixed scroll 2 has a predetermined gap from the bottom plate 3a of the orbiting scroll 3, and the end edge of the orbiting scroll 3b on the protruding side of the orbiting scroll 3 has a predetermined gap from the bottom plate 2a of the fixed scroll 2. Although not shown, tip seals are provided at an end edge of the protruding side of the scroll surround 2b of the fixed scroll 2 and an end edge of the protruding side of the scroll surround 3b of the movable scroll 3, respectively, to fill the above gap.
Further, the fixed scroll 2 and the movable scroll 3 are configured such that: in a state where the angular position of the scroll wrap 2b of the fixed scroll 2 in the circumferential direction and the angular position of the scroll wrap 3b of the movable scroll 3 in the circumferential direction are displaced from each other, the side wall of the scroll wrap 2b of the fixed scroll 2 and the side wall of the scroll wrap 3b of the movable scroll 3 partially contact each other. Thereby, a crescent-shaped sealed space (compression chamber) S is formed between the scroll wrap 2b of the fixed scroll 2 and the scroll wrap 3b of the movable scroll 3.
The fixed scroll 2 is fixed to a rear case 13, described later, of the casing 10, and has a recess 2a1 opened toward the rear case 13 side at a radial center portion thereof. Specifically, the recess 2a1 is formed on the back surface of the base plate 2a (i.e., the end surface on the opposite side of the orbiting scroll 3). The fastening structure and material of the fixed scroll 2 will be described in detail later.
The orbiting scroll 3 is configured to be capable of revolving around the axis of the fixed scroll 2 via a crank mechanism described later in a state where its rotation is prevented. Thereby, the scroll unit 1 moves the sealed space S toward the central portion, and gradually reduces the volume thereof. As a result, the refrigerant flowing into sealed space S from the outer end side of scroll wrap 2b of fixed scroll 2 and the outer end side of scroll wrap 3b of orbiting scroll 3 is compressed in sealed space S. The material of the orbiting scroll 3 will be described in detail later.
As shown in fig. 1, the housing 10 mainly includes: a front case 11, the front case 11 accommodating the scroll unit 1, the electric motor 20, and the inverter 30 inside thereof; a middle shell 12; a rear case 13; and an inverter cover 14, and the housing 10 is formed to extend in one direction. The above (11, 12, 13, 14) are integrally fastened by fastening members such as bolts 15 to constitute the casing 10 as a pressure vessel of the compressor 100. In the present embodiment, the front case 11 corresponds to a "first case portion" of the present invention, the middle case 12 corresponds to an "intermediate case portion" of the present invention, and the rear case 13 corresponds to a "second case portion" of the present invention. The material of each part of the housing 10 will be described in detail later.
A suction chamber H1 into which refrigerant is introduced and a discharge chamber H2 from which refrigerant compressed by the scroll unit 1 is discharged are formed in the casing 10, the suction chamber H1 and the discharge chamber H2 being described below. The suction chamber H1 is formed on one end side (front case 11 side) in the casing 10, and the discharge chamber H2 is formed on the other end side (rear case 13 side) in the casing 10.
Further, an inner case 40 is disposed inside the housing 10. The inner casing 40 accommodates therein a compression mechanism portion for compressing the refrigerant introduced into the suction chamber H1 and discharging the compressed refrigerant to the discharge chamber H2, and is disposed between the suction chamber H1 and the discharge chamber H2 in the casing 10.
In the present embodiment, the inner case 40 is disposed inside the middle case 12. The orbiting scroll 3 is provided in the inner casing 40, and functions as a compression mechanism that compresses the refrigerant introduced into the suction chamber H1 and discharges the compressed refrigerant into the discharge chamber H2. That is, in the present embodiment, the orbiting scroll 3 corresponds to the "compression mechanism" of the present invention. Further, the detailed structure of the inner case 40 will be described later.
The front case 11 includes: a substantially cylindrical peripheral wall portion 11 a; and a partition wall 11b functioning as a pressure partition wall. The inner space of the front case 11 is partitioned by the partition wall 11b into a first space S1 as the suction chamber H1 and a second space S2 other than the first space S2. Further, the electric motor 20 is disposed in the first space S1, and the inverter 30 is disposed in the second space.
An opening of one end portion of the peripheral wall portion 11a is closed by an inverter cover 14. One end of the middle case 12 abuts on the other end of the peripheral wall 11 a. The portion of the peripheral wall portion 11a on the first space S1 side is formed in a cylindrical shape, and has an inner peripheral surface W1a exposed to the suction chamber H1 (first space S1). The portion of the peripheral wall portion 11a on the second space S2 side is formed into, for example, a box shape corresponding to the shape of the inverter 30.
The partition wall 11b has a support portion 11b1, and the support portion 11b1 is used to support one end portion (specifically, the end portion on the inverter 30 side) of the drive shaft 21 of the electric motor 20. In the present embodiment, the support portion 11b1 is provided in a cylindrical shape protruding from the first space-side end surface W1b of the partition wall 11b toward the electric motor 20 side at the radial center portion of the partition wall 11 b. The bearing 16 is fitted in the support portion 11b 1. The support portion 11b1 supports the one end portion of the drive shaft 21 of the electric motor 20 via the bearing 16. The first space-side end surface W1b of the partition wall 11b is exposed to the suction chamber H1 (first space S1). That is, in the present embodiment, the front housing 11 has the inner peripheral surface W1a of the peripheral wall portion 11a and the first space-side end surface W1b of the partition wall 11b as the inner wall surface W1 exposed to the suction chamber H1
Further, a suction passage (suction port) P1 for the refrigerant is formed in the peripheral wall portion 11 a. The suction passage P1 is formed to penetrate through the base end portion on the partition wall 11b side in the peripheral wall portion 11a of the front case 11, and guides the refrigerant into the first space S1. Specifically, the refrigerant from the low-pressure side of the refrigerant circuit is sucked into the first space S1 of the front shell 11 through the suction passage P1. Thus, the first space S1 functions as the suction chamber H1. The electric motor 20 is configured to be cooled by circulating the refrigerant around the electric motor 20 in the suction chamber H1. In fig. 1, the space above the electric motor 20 communicates with the space below the electric motor 20, and constitutes one suction chamber H1 together with the space below the electric motor 20.
The middle case 12 is formed in a cylindrical shape by connecting the front case 11 and the rear case 13, and is disposed so as to be sandwiched between the front case 11 and the rear case 13. As described above, in the present embodiment, the inner case 40 is disposed in the middle case 12. The fastening structure of the middle shell 12 will be described in detail later.
The rear case 13 is formed into a disk shape, for example, and a peripheral edge portion of one end face W2a abuts on the other end portion of the middle case 12 to close the opening of the middle case 12 on the other end portion side.
A peripheral portion (in other words, a portion surrounding the recess 2a 1) of the back surface (the end surface on the opposite side to the end surface on the movable scroll 3 side) of the base plate 2a of the fixed scroll 2 abuts on an inner portion of the peripheral portion of the one end surface W2a of the rear housing 13. A refrigerant discharge chamber H2 is defined by the end surface W2a of the rear casing 13 and the concave portion 2a1 of the bottom plate 2a of the fixed scroll 2, and a portion corresponding to the concave portion 2a1 in the end surface W2a of the rear casing 13 is exposed to the discharge chamber H2. That is, in the present embodiment, the rear case 13 has one end face W2a as an inner wall face W2 exposed to the discharge chamber H2.
Further, a discharge hole 2a2 for compressing the refrigerant is formed in the center of the bottom plate 2a (specifically, the bottom surface of the recessed portion 2a 1) of the fixed scroll 2. Further, a check valve 17 as a check valve is provided in the discharge chamber H2 so as to cover the opening of the discharge hole 2a2, and the check valve 17 restricts the flow from the discharge chamber H2 to the scroll unit 1 side. In the discharge chamber H2, the refrigerant compressed in the sealed space S is discharged through the discharge hole 2a2 and the check valve 17. The compressed refrigerant in the discharge chamber H2 is discharged to the high-pressure side of the refrigerant circuit through the discharge passage 13a formed in the rear shell 13 and the discharge port P2.
The electric motor 20 includes a drive shaft 21, a rotor 22, and a stator core unit 23, the stator core unit 23 is disposed radially outward of the rotor 22, and a three-phase ac motor is applied to the electric motor 20, for example.
The drive shaft 21 is coupled to the orbiting scroll 3 via a crank mechanism to transmit the rotational force of the electric motor 20 to the orbiting scroll 3. The one end portion of the drive shaft 21 is rotatably supported by the bearing 16 fitted to the support portion 11b 1. A bearing holding portion 24 is provided between electric motor 20 and orbiting scroll 3, and bearing holding portion 24 supports the other end portion (more specifically, the end portion on orbiting scroll 3 side) of drive shaft 21. The other end portion of the drive shaft 21 is inserted through a through hole formed in the bearing holding portion 24 and rotatably supported by the bearing 18.
The rotor 22 is rotatably supported on the radially inner side of the stator core unit 23 via a drive shaft 21, and the drive shaft 21 is fitted into a shaft hole formed in the radial center of the rotor 22. When a magnetic field is generated in the stator core unit 23 by the power supply from the inverter 30, a rotational force acts on the rotor 22, and the drive shaft 21 is driven to rotate.
The bearing holding portion 24 holds a bearing 18, which rotatably supports the other end portion of the drive shaft 21, and constitutes a part of the inner housing 40 as described later. The bearing holding portion 24 is formed in a bottomed cylindrical shape, for example, and has a cylindrical portion 24a and a bottom wall portion 24 b. A cylindrical portion 24a has a cylindrical inner space with a step formed therein. Specifically, cylindrical portion 24a includes, in order from its opening side, large-diameter hole portion 24a1, small-diameter hole portion 24a2, and connection surface 24a3, small-diameter hole portion 24a2 having an inner diameter smaller than the inner diameter of large-diameter hole portion 24a1, and connection surface 24a3 connecting large-diameter hole portion 24a1 and small-diameter hole portion 24a 2. Orbiting scroll 3 is disposed in large diameter hole portion 24a 1. An opening-side end of the cylindrical portion 24a abuts against a peripheral edge portion of the end surface of the base plate 2a of the fixed scroll 2 on the movable scroll 3 side. Further, the bearing 18 is fitted in the small-diameter hole portion 24a 2. A through hole through which the other end portion of the drive shaft 21 is inserted is opened in a radially central portion of the bottom wall portion 24 b. The material of the bearing holding portion 24 will be described in detail later.
Annular thrust plate 19 is disposed between connection surface 24a3 of bearing holding portion 24 and base plate 3a of orbiting scroll 3. Connection surface 24a3 receives the thrust from orbiting scroll 3 via thrust plate 19. The seal members 19a are disposed on the connection surface 24a3 and the bottom plate 3a at positions abutting against the thrust plate 19. Although not shown, a refrigerant introduction passage for introducing refrigerant from the suction chamber H1 to a space H4 in the vicinity of the outer end of the scroll wrap 2b of the fixed scroll 2 and the outer end of the scroll wrap 3b of the movable scroll 3 is formed in the bearing holding portion 24. The refrigerant introduction passage communicates between the space H4 and the suction chamber H1. Therefore, the pressure in the space H4 is substantially equal to the pressure in the suction chamber H1.
In the present embodiment, as shown in fig. 2, which is a partial sectional view including the crank mechanism, the crank mechanism includes: a cylindrical boss portion 25, the boss portion 25 being formed to protrude from a back surface (an end surface on the opposite side to the end surface on the fixed scroll 2 side) of the bottom plate 3a of the movable scroll 3; an eccentric bush 27, the eccentric bush 27 being eccentrically attached to a crank 26 provided at the other end of the drive shaft 21; and a sliding bearing 28, wherein the sliding bearing 28 is fitted to the boss portion 25. The eccentric bush 27 is rotatably supported in the boss portion 25 via a slide bearing 28. Further, a balance weight 29 is attached to the other end portion of the drive shaft 21, and the balance weight 29 overcomes a centrifugal force generated when the orbiting scroll 3 operates. Although not shown, a rotation preventing mechanism for preventing rotation of the scroll 3 may be provided as appropriate. Accordingly, the orbiting scroll 3 is configured to be capable of orbiting and revolving around the axis of the fixed scroll 2 via the crank mechanism in a state where its rotation is prevented. The compressor 100 compresses the refrigerant flowing into the sealed space S of the scroll unit 1 by driving the electric motor 20 to make the movable scroll 3 perform an orbital motion around the axis of the fixed scroll 2.
The inverter 30 controls the voltage applied to the electric motor 20 and is disposed in the second space S2 in the front case 11. The inverter 30 includes a plurality of power switching elements for controlling an applied voltage, and converts direct-current power from an external power source such as a battery of the vehicle into three-phase alternating-current power to supply the electric motor 20 with the three-phase alternating-current power.
Next, the flow of the refrigerant in the compressor 100 will be described.
The low-temperature and low-pressure refrigerant from the low-pressure side of the refrigerant circuit is introduced into the suction chamber H1 through the suction port P1, and then introduced into the space H4 near the outer end of the scroll unit 1 through the refrigerant introduction passage (not shown). The refrigerant in the space H4 enters the sealed space S of the scroll unit 1 and is compressed in the sealed space S. The high-temperature and high-pressure refrigerant compressed to have a high temperature is discharged to the discharge chamber H2 through the discharge hole 2a2 and the check valve 16, and then discharged from the discharge chamber H2 to the high-pressure side of the refrigerant circuit through the discharge passage 12a and the discharge port P2.
Here, since the power switching element is an element that is likely to generate heat and increase in temperature, it is necessary to suppress the temperature increase. In this regard, a low-temperature refrigerant is supplied to the suction chamber H1 in the front shell 11 through the suction port P1, and cools the electric motor 20 and also cools the partition wall 11b by the low-temperature refrigerant. Therefore, the power switching element is disposed in contact with the second space-side wall W3 of the partition wall 11 b. As a result, the temperature rise of the power switching element is effectively suppressed.
Next, a fastening structure of the middle case 12 of the present embodiment will be described.
The middle case 12 integrally fastens the front case 11 and the rear case 13 in a state of being disposed between the front case 11 and the rear case 13. Specifically, the one end of the middle case 12 abuts against the other end of the peripheral wall 11a of the front case 11, and the other end of the middle case 12 abuts against the peripheral edge of the one end face W2a of the rear case 13. Through holes for inserting the bolts 15 are opened at a plurality of locations appropriately spaced in the circumferential direction at the above-mentioned peripheral edge portion of the rear case 13 and the middle case 12. Further, a female screw portion is formed at the other end portion of the peripheral wall portion 11a of the front case 11 in accordance with the opening position of the through hole. The bolt 15 is inserted through the insertion holes of the rear case 13 and the middle case 12, and is screwed with the female screw portion of the front case 11. By so doing, the middle case 12 is sandwiched between the front case 11 and the rear case 13, and is integrally fastened with the front case 11 and the rear case 13.
Next, a fastening structure of the fixed scroll 2 of the present embodiment will be described.
The fixed scroll 2 is integrally fastened to the rear casing 13 and the bearing holding portion 24 in a state of being disposed between the rear casing 13 and the bearing holding portion 24. Specifically, a peripheral portion of the rear surface of the bottom plate 2a of the fixed scroll 2 abuts on one end surface W2a of the rear housing 13, and a peripheral portion of the end surface of the bottom plate 2a of the fixed scroll 2 on the movable scroll 3 side abuts on the opening side end portion of the cylindrical portion 24a of the bearing holding portion 24. Through holes for inserting bolts 15 are opened at a plurality of locations appropriately spaced in the circumferential direction at the cylindrical portion 24a of the bearing holding portion 24 and the peripheral edge portion of the bottom plate 2a of the fixed scroll 2. Further, a female screw portion is formed on the one end surface W2a of the rear case 13 in accordance with the opening position of the through hole. The bolt 15 is inserted through the through holes of the cylindrical portion 24a and the bottom plate 2a, and is screwed with the female screw portion of the rear case 13. Thus, the fixed scroll 2 is sandwiched between the rear housing 13 and the bearing holding portion 24, and is integrally fastened to the rear housing 13 and the bearing holding portion 24.
In the present embodiment, as shown in fig. 2, by adopting the above-described fastening structure of the fixed scroll 2, a compression mechanism unit 50 having the rear housing 13, the fixed scroll 2, the movable scroll 3, the bearing 18, the thrust plate 19, the seal member 19a, the drive shaft 21, the bearing holding portion 24, and the crank mechanisms (25, 26, 27, 28, 29) is configured. The compression mechanism unit 50 is assembled such that a portion other than the rear case 13 thereof is inserted into the middle case 12 and the front case 11, and is detachably mounted with respect to the middle case 12 and the rear case 11.
Next, the detailed structure of the inner case 40 of the present embodiment will be described.
Inner casing 40 accommodates orbiting scroll 3 as a compression mechanism therein. Movable scroll 3 is disposed in a space formed by bottom plate 2a of fixed scroll 2 and bearing holder 24 abutting each other (specifically, a space inside large-diameter hole 24a1 of bearing holder 24). That is, in the present embodiment, the inner casing 40 is constituted by the base plate 2a of the fixed scroll 2 and the bearing holding portion 24.
In the present embodiment, discharge chamber H2 is defined by one end surface W2a of rear housing 13 and concave portion 2a1 of bottom plate 2a of fixed scroll 2. In other words, inner casing 40 (specifically, base plate 2a of the fixed scroll) cooperates with rear casing 13 to form discharge chamber H2.
Next, the materials of the fixed scroll 2, the movable scroll 3, the casing 10, and the bearing holding portion 24 will be described.
In the present embodiment, the fixed scroll 2, the bearing holding portion 24, and the rear housing 13 are made of the same material of iron. That is, the fixed scroll 2 and the bearing holding portion 24 constituting the inner housing 40 are made of an iron-based material, and the rear case 13 and the bearing holding portion 24, which are main members fastened to the fixed scroll 2, are made of the same iron-based material as the fixed scroll 2. Orbiting scroll 3 is not a member fastened to fixed scroll 2. Therefore, orbiting scroll 3 may be formed of the same material as fixed scroll 2 or a different material (for example, an aluminum-based material).
Further, in the present embodiment, the front case 11 and the inverter cover 14 are made of an aluminum-based material. In the present embodiment, the middle shell 12 is made of a thermosetting resin such as a phenol resin. That is, the same material (iron-based material) as that of the fixed scroll 2 is used for the portion fastened to the fixed scroll 2 (the rear case 13 and the bearing holding portion 24), and the material (aluminum-based material, thermosetting resin) different from that of the fixed scroll 2 is used for the portion of the housing 10 not fastened to the fixed scroll 2 (the front case 11, the middle case 12, and the inverter cover 14).
Here, the thermal conductivity of the thermosetting resin is generally much lower than that of the iron-based material, and the thermal conductivity of the iron-based material is generally lower than that of the aluminum-based material. That is, the middle case 12 made of thermosetting resin has lower thermal conductivity than that of the rear case 13 made of iron-based material.
According to the compressor 100 of the present embodiment, the front shell 11 having the inner wall surface W1 exposed to the suction chamber H1 and the rear shell 13 having the inner wall surface W2 exposed to the discharge chamber H2 in the outer shell 10 are connected by the middle shell 12 having a lower thermal conductivity than the rear shell 13. That is, the outer case 10 has a structure in which the middle case 12 having higher heat insulation than the rear case 13 is sandwiched between the rear case 13 on the high temperature side and the front case 11 on the low temperature side. Thus, in the casing 10, even if the heat of the refrigerant in the discharge chamber H2 is transmitted into the members of the rear casing 13 via the inner wall surface W2 of the rear casing 13, the heat transfer from the rear casing 13 to the front casing 11 is suppressed or prevented by the middle casing 12. As a result, expansion of the refrigerant in the suction chamber H1 due to heat transfer from the rear shell 13 to the front shell 11 can be suppressed or prevented, and a decrease in the mass flow rate of the refrigerant discharged from the compressor 100 can be suppressed or prevented.
Further, the following structure is provided: a compression mechanism portion (orbiting scroll 3) is provided in the inner casing 40, and a discharge chamber H2 is formed in one end portion side (i.e., rear case 13 side) in the outer casing 10. Accordingly, the strength of the compressor 100 against the high pressure on the discharge pressure side can be ensured mainly by the inner casing 40 and the rear shell 13, and a member having a lower strength than the rear shell 13 can be used for a portion of the casing 10 other than the rear shell 13. As a result, the degree of freedom regarding the material selection of the middle case 12 and the front case 11 can be expanded.
In the present embodiment, the inner case 40 is configured to be disposed inside the middle case 12. This ensures a large space in which the electric motor 20 and the like can be disposed on the front case 11 side in the housing 10.
In the present embodiment, the front case 11 has a partition wall 11b that partitions an internal space thereof into a first space S1 as the suction chamber H1 and a second space S2 other than the first space, the electric motor 20 is disposed in the first space S1, and the inverter 30 is disposed in the second space S2. Further, heat transfer from the rear shell 13 into the suction chamber H1 can be suppressed or prevented by the middle shell 12. This allows the low-temperature refrigerant drawn into the suction chamber H1 from the low-pressure side of the refrigerant circuit through the suction port P1 to be effectively used for cooling the electric motor 20 and the power switching elements of the inverter 30.
In the present embodiment, the middle shell 12 is made of a thermosetting resin. This makes it possible to provide the middle shell 12 with a predetermined strength sufficient for not deforming at the temperature in the suction chamber H1, to make the middle shell 12 extremely low in thermal conductivity, and to reduce the weight of the middle shell 12.
In the present embodiment, the fixed scroll 2 is integrally fastened to the rear housing 13 and the bearing holding portion 24 in a state of being disposed between the rear housing 13 and the bearing holding portion 24. Further, the fixed scroll 2, the bearing holding portion 24, and the rear case 13 (in other words, the inner housing 40 and the rear case 13) are made of the same material of iron. That is, since the fixed scroll 2 can be sandwiched between the rear housing 13 and the bearing holding portion 24 to be integrally fastened to the rear housing 13 and the bearing holding portion 24, the rigidity of the fixed scroll 2 can be improved. In addition, since the rear housing 13 and the bearing holding portion 24 fastened to the fixed scroll 2 are formed of the same material as the fixed scroll 2, the linear expansion coefficient of the main member in contact with the fixed scroll 2 can be made to be equal to the linear expansion coefficient of the fixed scroll 2. Therefore, the fixed scroll 2 can be prevented from being deformed due to the difference between the linear expansion coefficient of the fixed scroll 2 and the linear expansion coefficient of the member around the fixed scroll 2. Further, since an iron-based material having a lower linear expansion coefficient than aluminum is used as the material of the fixed scroll 2, the amount of deformation of the fixed scroll 2 itself due to temperature change can be reduced.
In this way, according to the compressor 100, by designing the fastening structure around the fixed scroll 2 and adopting the same iron-based material as the fixed scroll 2 as the material of the main member around the fixed scroll 2, it is possible to achieve the improvement of the rigidity of the fixed scroll 2 and the conduction by the temperature change of the fixed scroll 2As a result, the amount of change in the allowable gap (seal gap) between fixed scroll 2 and orbiting scroll 3 during the compression operation can be reduced. Therefore, can be used for CO2In order to improve the airtightness of the sealed space S of the scroll unit 1 when the refrigerant is compressed, the gap is set to be sufficiently smaller than a gap allowable when the conventional refrigerant such as R134a is compressed, and the set gap can be easily maintained in an appropriate range during the compression operation. In this way, the amount of change in the gap between fixed scroll 2 and orbiting scroll 3 is reduced, thereby improving the airtightness of sealed space S of scroll unit 1.
In the present embodiment, a material (aluminum-based material, thermosetting resin) different from that of the fixed scroll 2 is used for the portions of the housing 10 that are not fastened to the fixed scroll 2 (the front case 11, the middle case 12, and the inverter cover 14). This can suppress an increase in the weight of the entire housing 10.
In addition, in the present embodiment, the front case 11 is made of an aluminum-based material and has a higher thermal conductivity than the thermal conductivity of the rear case 13, but is not limited thereto, and may have a lower thermal conductivity than the thermal conductivity of the rear case 13. Accordingly, the entire middle case 12 and the front case 11, which are the main heat transfer paths from the rear case 13 to the suction chamber H1, can be made highly heat-insulating members, and therefore, heat transfer from the rear case 13 to the suction chamber H1 can be more effectively suppressed or prevented.
In the case where the thermal conductivity of the front case 11 is made lower than that of the rear case 13, the front case 11 may be made of a thermosetting resin as in the middle case 12 as long as a necessary and sufficient strength can be secured. Further, the front case 11 may be made of the same kind of thermosetting resin as the middle case 12 or may be made of a different kind of thermosetting resin. In the case of using the same kind of thermoplastic resin, for example, the front shell 11 and the middle shell 12 may be integrally formed. In this case, a portion of the integrally molded housing molding member in which the electric motor 20 is housed corresponds to a "first housing portion" of the present invention, and a portion of the housing molding member in which the inner housing 40 is housed corresponds to an "intermediate housing portion" of the present invention.
Further, the middle case 12 is made of a thermosetting resin, but is not limited thereto, and an appropriate material having a lower thermal conductivity than that of the rear case 13 can be applied.
Further, the inner housing 40 may be configured by the base plate 2a of the fixed scroll 2 and the bearing holding portion 24 and may be configured by using a part of the scroll unit 1 (that is, the fixed scroll 2), but is not limited thereto, and may be configured to cover the entire scroll unit 1 including the fixed scroll 2 and the movable scroll 3 by a member different from the scroll unit 1. In this case, the entire scroll unit 1 corresponds to the "compression mechanism portion" of the present invention.
Note that, although orbiting scroll 3 is housed in bearing holding portion 24 (specifically, large diameter hole portion 24a1), it is not limited to this, and may be housed in fixed scroll 2 as shown in fig. 3. In this case, the movable scroll 3 is configured to include a large diameter portion 2a3 protruding from the peripheral edge portion of the bottom plate 2a of the fixed scroll 2 toward the bearing holding portion 24 side, and to be accommodated in the large diameter portion 2a3 of the fixed scroll 2. The bearing holding portion 24 may include a small-diameter hole portion 24a2 in the cylindrical portion 24a thereof, into which the bearing 18 is fitted.
Further, although the refrigerant is CO2The refrigerant is not limited to this, and an appropriate refrigerant can be used.
In addition, although the compressor 100 is described by taking an example of a so-called inverter-integrated type, the present invention is not limited to this, and the compressor 100 may be separate from the inverter 30. In this case, the housing 10 only needs to include the front case 11, the middle case 12, and the rear case 13.
Further, the compressor 100 is described by taking a scroll compressor as an example, but the present invention is not limited to this, and a compressor including an appropriate compression mechanism such as a vane compressor may be employed.
Although the preferred embodiment of the present invention and the modification thereof have been described above, the present invention is not limited to the above embodiment and modification, and various modifications and changes can be made based on the technical idea of the present invention.
(symbol description)
3 … orbiting scroll (compression mechanism);
10 … a housing;
11 … front shell (first shell part);
12 … middle shell (middle outer shell part);
13 … rear shell (second shell part);
11b … demarcate walls;
20 … electric motor;
24 … bearing holding part (inner housing);
30 … motor drive circuit (inverter);
40 … an inner housing;
100 … compressor;
h1 … suction chamber;
h2 … discharge chamber;
s1 … a first space;
s2 … second space;
w1 … inner wall surface;
w2 … inner wall surface.
Claims (7)
1. A compressor, comprising:
a housing extending in one direction;
an inner housing disposed between a suction chamber formed on one end side in the casing and a discharge chamber formed on the other end side in the casing; and
a compression mechanism portion that is provided in the inner case, compresses a fluid introduced into the suction chamber, and discharges the compressed fluid to the discharge chamber,
it is characterized in that the preparation method is characterized in that,
the housing includes:
a first housing portion having an inner wall surface exposed to the suction chamber;
a second housing section having an inner wall surface exposed to the discharge chamber; and
an intermediate case part connecting between the first case part and the second case part and having a thermal conductivity lower than that of the second case part.
2. The compressor of claim 1,
the first case portion has a thermal conductivity lower than the thermal conductivity of the second case portion.
3. Compressor according to claim 1 or 2,
the inner housing is disposed within the middle housing portion.
4. A compressor according to any one of claims 1 to 3,
the first housing part has a partitioning wall that partitions an internal space of the first housing part into a first space as the suction chamber and a second space outside the first space,
an electric motor for driving the compression mechanism is disposed in the first space,
a motor drive circuit for controlling a voltage applied to the electric motor is disposed in the second space.
5. Compressor according to any one of claims 1 to 4,
the middle housing portion is made of a thermosetting resin.
6. A compressor according to any one of claims 1 to 5,
the first housing portion is made of a thermosetting resin.
7. A compressor according to any one of claims 1 to 6,
the inner housing and the second housing part are made of the same material of the iron type.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017109159A JP2018204493A (en) | 2017-06-01 | 2017-06-01 | Compressor |
| JP2017-109159 | 2017-06-01 | ||
| PCT/JP2018/019430 WO2018221282A1 (en) | 2017-06-01 | 2018-05-15 | Compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110621881A true CN110621881A (en) | 2019-12-27 |
Family
ID=64455351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880031768.1A Pending CN110621881A (en) | 2017-06-01 | 2018-05-15 | Compressor with a compressor housing having a plurality of compressor blades |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2018204493A (en) |
| CN (1) | CN110621881A (en) |
| DE (1) | DE112018002824T5 (en) |
| WO (1) | WO2018221282A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022111377A1 (en) | 2022-05-06 | 2023-11-09 | OET GmbH | Displacement machine based on the spiral principle |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0475186U (en) * | 1990-11-08 | 1992-06-30 | ||
| JP2005171881A (en) * | 2003-12-11 | 2005-06-30 | Sanden Corp | Open type compressor |
| JP2009264172A (en) * | 2008-04-23 | 2009-11-12 | Toyota Industries Corp | Electric compressor |
| JP2010106683A (en) * | 2008-10-28 | 2010-05-13 | Denso Corp | Compressor |
| CN102734172A (en) * | 2011-03-31 | 2012-10-17 | 株式会社丰田自动织机 | Motor-driven compressor |
| CN103452802A (en) * | 2012-05-30 | 2013-12-18 | 株式会社丰田自动织机 | Motor-driven compressor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007315222A (en) * | 2006-05-24 | 2007-12-06 | Sanden Corp | Electric compressor |
-
2017
- 2017-06-01 JP JP2017109159A patent/JP2018204493A/en active Pending
-
2018
- 2018-05-15 WO PCT/JP2018/019430 patent/WO2018221282A1/en active Application Filing
- 2018-05-15 DE DE112018002824.0T patent/DE112018002824T5/en not_active Ceased
- 2018-05-15 CN CN201880031768.1A patent/CN110621881A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0475186U (en) * | 1990-11-08 | 1992-06-30 | ||
| JP2005171881A (en) * | 2003-12-11 | 2005-06-30 | Sanden Corp | Open type compressor |
| JP2009264172A (en) * | 2008-04-23 | 2009-11-12 | Toyota Industries Corp | Electric compressor |
| JP2010106683A (en) * | 2008-10-28 | 2010-05-13 | Denso Corp | Compressor |
| CN102734172A (en) * | 2011-03-31 | 2012-10-17 | 株式会社丰田自动织机 | Motor-driven compressor |
| CN103452802A (en) * | 2012-05-30 | 2013-12-18 | 株式会社丰田自动织机 | Motor-driven compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018204493A (en) | 2018-12-27 |
| WO2018221282A1 (en) | 2018-12-06 |
| DE112018002824T5 (en) | 2020-02-13 |
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Application publication date: 20191227 |
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