JP4181431B2 - Hybrid compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hybrid compressor including two compression mechanisms that can be driven independently.
[0002]
[Prior art]
As a compressor used in a vehicle refrigeration system or the like, a compression mechanism driven by a vehicle prime mover (a vehicle traveling engine consisting of an internal combustion engine or a vehicle traveling electric motor in an electric vehicle or the like), and an electric motor dedicated to the compressor A hybrid compressor having two compression mechanisms, such as a compression mechanism driven by an electric motor (for example, an electric motor built in a compressor), is known (for example, Patent Document 1).
[0003]
In addition, as a hybrid compressor used in a vehicle refrigeration system or the like, a scroll type first compression mechanism driven only by a vehicle prime mover and a scroll type driven only by a built-in electric motor by the applicant of the present application. A hybrid compressor in which a second compression mechanism and a fixed scroll of both compression mechanisms are integrated with each other back to back has been proposed (Patent Document 2). With such a hybrid compressor, it becomes possible to operate each compression mechanism independently or simultaneously, and it is possible to obtain optimum discharge performance according to the requirements at that time.
[0004]
Furthermore, in order to improve the hybrid compressor previously proposed by the present applicant, a structure provided with a communication passage for communicating the suction chambers of both compression mechanisms has also been proposed by the present applicant (patent). Reference 3). In this proposal, the communication passage is mainly provided so that the suction chambers of both compression mechanisms communicate with each other on the lower side so that liquid refrigerant including oil is sucked into the moving compression mechanism to prevent poor lubrication. It was. In order to reduce the pressure loss in the communication path, in addition to the communication on the lower side, it is conceivable to discontinuously provide substantially the entire region in the circumferential direction of the compression mechanism.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 6-87678 (Scope of Claim for Utility Model Registration)
[0006]
[Patent Document 2]
Japanese Patent Application No. 2001-280630 (Claims)
[Patent Document 3]
Japanese Patent Application No. 2002-33189 (Claims)
[0007]
[Problems to be solved by the invention]
However, in the hybrid compressor according to the above proposal, particularly the hybrid compressor according to Patent Document 3, for example, when at least one of the compression mechanisms is stopped, the refrigerant including oil that has recirculated from the external refrigerant circuit is Then, it substantially freely flows into the two suction chambers via the communication passage disposed on the lower side of the suction chamber. The oil-containing refrigerant flows into the suction chamber of the second compression mechanism that is driven by the built-in electric motor, and enters the electric motor unit. When the amount of intrusion increases, the motor, its cable, etc. are immersed and insulative May decrease. In particular, when the ratio of the oil component in the refrigerant increases, that is, when the oil-rich intake gas or liquid refrigerant is used, such a decrease in insulation tends to occur.
[0008]
In addition, when the oil-rich intake gas flows into the suction chamber side of the second compression mechanism driven by the built-in electric motor, the ratio of the oil component is high, which may reduce the compression efficiency on the second compression mechanism side. is there.
[0009]
Furthermore, particularly when the liquid refrigerant accumulates in the suction chamber of the second compression mechanism driven by the built-in electric motor, a so-called liquid compression activation state occurs at the time of activation, and the activation on the motor drive side may become unstable.
[0010]
Accordingly, an object of the present invention is to assemble a first compression mechanism that is driven only by a first drive source and a second compression mechanism that is driven only by a built-in electric motor as a second drive source, and are assembled together. An object of the present invention is to provide a hybrid compressor structure that ensures good insulation on the motor drive side, maintains high compression efficiency, and provides stable startability on the motor drive side. .
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems, a hybrid compressor according to the present invention is driven only by a first compression mechanism that is driven only by a first drive source including a vehicle prime mover and a built-in electric motor as a second drive source. And a second compression mechanism, and a hybrid compressor including a communication passage communicating with suction chambers of both compression mechanisms, wherein the communication passage is connected to the second compression mechanism. It is characterized by being connected only to the upper part of the suction chamber.
[0012]
In this hybrid compressor, the communication passage can be constituted by a passage communicating between the upper portions of both suction chambers of both compression mechanisms. Alternatively, the communication path may be constituted by a branch suction passage branched from the suction passage connected to the suction chamber of the first compression mechanism and connected to the upper portion of the suction chamber of the second compression mechanism. In the latter case, the communication path can be arranged higher than the former case.
[0013]
The communication path may be provided with a partial shielding wall that suppresses the amount of refrigerant-containing oil and / or liquid refrigerant flowing into the suction chamber of the second compression mechanism. Thereby, it is possible to suppress excess oil or liquid refrigerant from flowing into the suction chamber of the second compression mechanism.
[0014]
The type of the hybrid compressor according to the present invention is not particularly limited. In particular, the present invention is a hybrid in which the first compression mechanism and the second compression mechanism are scroll-type compression mechanisms, and the fixed scrolls of both compression mechanisms are arranged back to back. It is effective when applied to a compressor. In this case, it is possible to adopt a structure composed of a fixed scroll member in which both fixed scrolls arranged back to back are integrally formed.
[0015]
Further, the vehicle prime mover as the first drive source in the present invention is a concept including an electric motor for vehicle travel in an electric vehicle or the like in addition to an engine composed of an internal combustion engine.
[0016]
In the hybrid compressor according to the present invention as described above, since the communication path is connected only to the upper portion of the suction chamber of the second compression mechanism, liquid refrigerant and oil are supplied from the first compression mechanism side to the second compression mechanism. Therefore, it is difficult to flow into the suction chamber of the second compression mechanism, and a large amount is prevented from accumulating in the suction chamber of the second compression mechanism. As a result, the amount of intrusion into parts such as motors and cables can be suppressed, and deterioration of insulating properties of these parts can be prevented.
[0017]
Further, as a result of suppressing the amount of liquid refrigerant and refrigerant-containing oil flowing into the suction chamber side of the second compression mechanism, it is prevented that the liquid component is excessively increased in the suction chamber, and the liquid compression activation state is avoided, Stabilization by the built-in electric motor is stable.
[0018]
Further, since the oil-rich intake gas is not directly drawn into the suction chamber side of the second compression mechanism, it is prevented that the ratio of the oil component is excessive on the second compression mechanism side, and the second compression mechanism side has a high compression efficiency. To be kept.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings, in comparison with the structure of a hybrid compressor proposed by the applicant of the present application.
1 and 2 show a hybrid compressor according to an embodiment of the present invention, and FIGS. 4 and 5 show a hybrid compressor according to the applicant's previous proposal for comparison. Yes.
[0020]
First, common parts of the structure shown in FIGS. 1 and 2 and the structure shown in FIGS. 4 and 5 will be described. 1 and 4, the hybrid compressors 1 and 50 are a first compression mechanism 2 driven via an electromagnetic clutch or the like (not shown) only by a first drive source (not shown) made of a vehicle prime mover or the like. The second compression mechanism 3 is driven only by the built-in electric motor 25 as the second drive source, and the first compression mechanism 2 and the second compression mechanism 3 are arranged in parallel in the axial direction of the compressor. And are assembled together. The first compression mechanism 2 includes a fixed scroll 11, a movable scroll 12 that engages with the fixed scroll 11 to form a plurality of working spaces (fluid pockets), and engages with the movable scroll 12 so as to orbit the movable scroll 12. And a ball coupling 14 that prevents the movable scroll 12 from rotating. The drive shaft 13 is rotationally driven by the first drive source via an electromagnetic clutch or the like.
[0021]
The second compression mechanism 3 includes a fixed scroll 21, a movable scroll 22 that meshes with the fixed scroll 21 to form a plurality of working spaces (fluid pockets), and engages with the movable scroll 22 so as to swing the movable scroll 22. And a ball coupling 24 that prevents the movable scroll 22 from rotating. The drive shaft 23 is rotationally driven by a built-in electric motor 25 as a second drive source.
[0022]
A suction chamber 16 is formed in the first compression mechanism 2, and a suction passage 18 from a suction port 17 provided in the housing 15 is connected to the suction chamber 16. A suction chamber 26 is formed in the second compression mechanism 3, and the suction chamber 26 is communicated with the suction chamber 16 of the first compression mechanism 2 via a communication path (this communication path will be described later). ing. The suction chamber 26 in the second compression mechanism 3 extends substantially through the gap between the ball coupling 24 and the bearing 27 to the electric motor 25 arrangement portion, and part of the suction gas enters the electric motor 25 arrangement portion. it can.
[0023]
In the present embodiment, the fixed scroll 11 of the first compression mechanism 2 and the fixed scroll 21 of the second compression mechanism 3 are formed as a fixed scroll member 31 that is disposed back to back and integrally formed. The fixed scroll member 31 is provided with discharge holes 32 and 33 at the center of both compression mechanisms 2 and 3, and a check valve 34 is provided here to compress from either one of the compression mechanisms. Fluid or compressed fluid from both compression mechanisms can be sent to an external circuit through the discharge passage 35 and the discharge port 36. The spiral body 21a on the fixed scroll 21 side of the second compression mechanism 3 is shown in FIGS.
[0024]
In the above-described communication passage, in the hybrid compressor 50 according to the above-mentioned proposal by the present applicant, as shown in FIGS. 4 and 5, the space between both the suction chambers 16 and 26 is the lower part of both compression mechanisms, Or it was connected by the communication path 51,52 provided in the lower part and the up-down direction middle step part, or the communication path (not shown) provided intermittently over the whole area | region. However, in the hybrid compressor 1 according to the above embodiment of the present invention, as shown in FIGS. 1 and 2, the communication passage 37 is connected only to the upper portion of the suction chamber 26 of the second compression mechanism 3. Is provided. In the present embodiment, the communication passage 37 extending through the integrally formed fixed scroll member 31 is provided so that only the upper portions of the suction chambers 16 and 26 are directly communicated with each other.
[0025]
The communication path connected only to the upper portion of the suction chamber 26 of the second compression mechanism 3 can take another form. For example, as shown in FIG. 3, a hybrid compressor 40 according to another embodiment is branched from a suction passage 41 connected to the suction chamber 16 of the first compression mechanism 2, and the suction chamber 26 of the second compression mechanism 3. A branch suction passage 42 connected to the upper portion of the pipe is provided, and the branch suction passage 42 can be substantially configured as a communication passage according to the present invention. A partial shielding wall 43 that suppresses the amount of refrigerant-containing oil and / or liquid refrigerant flowing into the suction chamber 26 of the second compression mechanism 3 may be provided immediately after the branch suction passage 42 is branched. This type of partial shielding wall can also be provided for the communication passage 37 described above.
[0026]
In the hybrid compressors 1 and 40 as shown in FIGS. 1 to 3, the communication passages 37 and 42 are connected only to the upper part of the suction chamber 26 of the second compression mechanism 3. Compared with the structure shown in FIGS. 4 and 5, liquid refrigerant or oil is less likely to flow into the suction chamber 26 of the second compression mechanism 3 from the first compression mechanism 2 side, and the suction chamber of the second compression mechanism 3. 26 is prevented from accumulating in a large amount. Therefore, the amount of intrusion to the electric motor 25 side is also suppressed, and deterioration of the insulation properties of the motor 25, cables, and the like is prevented. In particular, in the structure shown in FIGS. 1 and 2, since the liquid refrigerant and the oil do not flow into the suction chamber 26 of the second compression mechanism 3 unless the first compression mechanism 2 side is almost full, the first compression It is effectively prevented that a large amount of liquid refrigerant or oil flows from the mechanism 2 side. Further, in the structure shown in FIG. 3, the branch suction passage 42 as the communication passage is arranged at a higher level, so that it is further difficult to flow in.
[0027]
As a result of suppressing the amount of liquid refrigerant and refrigerant-containing oil flowing into the suction chamber 26 side of the second compression mechanism 3 in this way, it is possible to prevent the liquid component from being excessively increased in the suction chamber 26, and the liquid compression activation state is reduced. By avoiding this, the startability by the built-in electric motor 25 becomes extremely stable.
[0028]
Further, since the oil-rich intake gas is not directly drawn into the suction chamber 26 side of the second compression mechanism 3, it is possible to prevent the ratio of the oil component from being excessively increased on the second compression mechanism 3 side. High compression efficiency is ensured on the side. In particular, as shown in FIG. 3, if a partial shielding wall 43 is provided, a large amount of liquid refrigerant and oil components flow into the branch suction passage 42 can be efficiently suppressed at the initial stage of the route. The intended purpose will be achieved very effectively.
[0029]
If such hybrid compressors 1 and 40 are used, for example, in a refrigeration system for vehicles, it becomes possible to control a stable operating state with high compression efficiency, and the insulation on the motor side is particularly high. Costs can be reduced because there is no need to do this.
[0030]
【The invention's effect】
As described above, according to the hybrid compressor of the present invention, high insulation on the electric motor drive side can be secured, and it is not necessary to design the insulation on the motor side to be particularly high. It is possible to improve the compression efficiency by suppressing the inflow of liquid refrigerant and oil to the electric motor drive compression mechanism side, and to stabilize the startability on the motor drive side.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a hybrid compressor according to an embodiment of the present invention.
2 is a front view of a fixed scroll side in a second compression mechanism of the hybrid compressor of FIG. 1; FIG.
FIG. 3 is a longitudinal sectional view of a hybrid compressor according to another embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of a hybrid compressor according to a previous proposal by the present applicant.
5 is a front view of a fixed scroll side in a second compression mechanism of the hybrid compressor of FIG. 4; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 40 Hybrid compressor 2 1st compression mechanism 3 2nd compression mechanism 11, 21 Fixed scroll 12, 22 Movable scroll 13, 23 Drive shaft 16 Suction chamber 17 of 1st compression mechanism Suction port 18 Suction passage 25 2nd drive source Built-in electric motor 26 as a suction chamber 31 in the second compression mechanism Fixed scroll members 32 and 33 Discharge hole 35 Discharge passage 36 Discharge port 37 Communication passage 41 Intake passage 42 Branch suction passage 43 as a communication passage Partial shielding wall

Claims (6)

A first compression mechanism that is driven only by a first drive source composed of a motor for a vehicle and a second compression mechanism that is driven only by a built-in electric motor as a second drive source are arranged side by side and assembled together. A hybrid compressor having a communication passage communicating the suction chambers of both compression mechanisms, wherein the communication passage is connected only to an upper portion of the suction chamber of the second compression mechanism. .   The hybrid compressor according to claim 1, wherein the communication path includes a path communicating between upper portions of both suction chambers of both compression mechanisms.   2. The hybrid compressor according to claim 1, wherein the communication passage includes a branch suction passage branched from a suction passage connected to the suction chamber of the first compression mechanism and connected to an upper portion of the suction chamber of the second compression mechanism. .   The hybrid according to any one of claims 1 to 3, wherein a partial shielding wall that suppresses an inflow amount of refrigerant-containing oil and / or liquid refrigerant into the suction chamber of the second compression mechanism is provided in the communication path. Compressor.   5. The hybrid compressor according to claim 1, wherein the first compression mechanism and the second compression mechanism are scroll-type compression mechanisms, and fixed scrolls of both compression mechanisms are arranged back to back.   The hybrid compressor according to claim 5, comprising a fixed scroll member integrally formed with both fixed scrolls arranged back to back.

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