JP4253519B2 - Hybrid compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hybrid compressor in which a first compression mechanism driven only by a first drive source and a second compression mechanism driven only by a second drive source are integrally assembled.
[0002]
[Prior art]
Conventionally, a hybrid compressor having a single compression mechanism that can be driven by a vehicle engine or a built-in electric motor is known (Patent Document 1). For example, when the engine is stopped during driving by the engine, switching to driving by the built-in electric motor is performed.
[0003]
However, in a conventional hybrid compressor, since a single compression mechanism is selectively switched between an engine with a different output and a built-in electric motor, it is difficult to drive both drive sources with optimum efficiency. is there. Further, pulsation at the time of discharge may occur.
[0004]
Such a conventional hybrid compressor is still in an unpublished stage of application. However, the applicant of the present invention uses only a scroll-type first compression mechanism driven only by a vehicle engine and an electric motor. A hybrid compressor has been proposed in which fixed scrolls of a driven scroll-type second compression mechanism are integrally assembled back to back so that the first compressor and the second compressor can be selectively or simultaneously driven. (Patent Document 2).
[0005]
By the way, in a scroll type compressor, the discharge chamber is usually provided adjacent to the fixed scroll of the compression mechanism. For this reason, the flow path length of the discharge passage from the compression mechanism to the discharge chamber is extremely short (Patent Document 3).
[0006]
However, if the fixed scrolls of both compression mechanisms are arranged back-to-back as in the previous proposal by the present applicant (Patent Document 2), the discharge chambers are adjacent to the both fixed scrolls, that is, both the discharge chambers are fixed. It is difficult to provide between scrolls. For this reason, the discharge chamber is provided on the outer periphery of the housing, and both the compression mechanism and the discharge chamber communicate with each other via a discharge passage having a long flow path length. Further, in this way, when the flow path length of the discharge passage becomes long and the attachment position of the discharge valve is close to the outlet portion of the discharge passage to the discharge chamber, the flow path length from the compression mechanism to the discharge valve is extended. Therefore, once compressed fluid may re-expand, and compression efficiency may fall. Moreover, when it applies to a vehicle air conditioner, there exists a possibility that refrigerating capacity may fall remarkably.
[0007]
For this reason, in Patent Document 2, a discharge valve mechanism having a ball valve element is provided between the fixed scrolls of both compression mechanisms, that is, at the inlet portion to the discharge passage of the compression mechanism, thereby preventing a reduction in compression efficiency. It is like that.
[0008]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-130323 (page 2, FIG. 2)
[0009]
[Patent Document 2]
Japanese Patent Application No. 2002-031664 (Fig. 1)
[0010]
[Patent Document 3]
Japanese Patent Laid-Open No. 05-231358 (FIG. 1)
[0011]
[Problems to be solved by the invention]
However, if the discharge valve mechanism is provided between the fixed scrolls of both compression mechanisms, the workability of assembling the discharge valve mechanism and hence the hybrid compressor may be reduced.
[0012]
Accordingly, an object of the present invention is to provide a hybrid compressor that can reduce the re-expansion volume of a compressed fluid and prevent a reduction in compression efficiency, and is excellent in assembly workability, on the premise of the applicant's previous proposal. It is in.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, a hybrid compressor according to the present invention includes a scroll-type first compression mechanism driven only by a first drive source and a scroll-type second compression mechanism driven only by a second drive source. Doo is provided, the fixed scroll in both the compression mechanism reaches a provided in the fixed scroll member integrally formed so as to be arranged back to back from both the compression mechanism to the discharge chamber of the compressor, and independently A hybrid compressor having a discharge passage, wherein a discharge passage from at least one compression mechanism to a discharge chamber leads from an inlet to the discharge passage from the compression mechanism to an outlet to the discharge chamber of the discharge passage. A discharge valve mechanism for opening and closing the discharge passage is provided in the middle of the discharge passage.
[0014]
The method of assembling the discharge valve mechanism is not particularly limited. For example, if the discharge valve mechanism is assembled in advance and the assembled discharge valve mechanism is inserted into the discharge passage (for example, press-fitted), the discharge valve mechanism Can be easily assembled in the middle of the discharge passage.
[0015]
Further, the discharge valve mechanism can be formed from, for example, a flapper valve body that is loosely fitted by a pressure difference between both surfaces. Moreover, it can also form from what integrated a reed valve.
[0016]
The first drive source and the second drive source are not particularly limited. For example, when the hybrid compressor is applied to a vehicle air conditioner, the first drive source may be a vehicle prime mover. it can. An example of the second drive source is an electric motor built in the compressor. In the present specification, the vehicle prime mover is a concept including an engine composed of an internal combustion mechanism and an electric motor for running the vehicle in an electric vehicle or the like.
[0017]
In the hybrid compressor as described above, a discharge valve mechanism for opening and closing the discharge passage is provided in the middle of the discharge passage from at least one compression mechanism to the discharge chamber. Compared to the case where a discharge valve mechanism is installed at the outlet, the flow path length from the compression mechanism to the discharge valve mechanism can be shortened, the re-expansion volume of the fluid can be greatly reduced, and the compression of the hybrid compressor A reduction in efficiency can be prevented. Further, the assembly work efficiency can be greatly improved as compared with the case where the discharge valve mechanism is installed at the inlet portion from the compression mechanism to the discharge passage.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the hybrid compressor of the present invention will be described with reference to the drawings.
FIG. 1 shows a hybrid compressor according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a hybrid compressor. The hybrid compressor 1 has a front housing 2 and a rear housing 3. Between the front housing 2 and the rear housing 3, there is provided a fixed scroll member 6 constituting a fixed scroll of both the scroll type first compression mechanism 4 and the scroll type second compression mechanism 5. In this embodiment, the fixed scrolls of the compression mechanisms 4 and 5 are formed back to back and integrally as shown in FIG.
[0019]
A suction chamber 7 and a discharge chamber 8 are formed integrally with the fixed scroll member 6.
[0020]
The fixed scroll member 6 is provided with a suction hole 11 that communicates the suction chamber 7 with the inside of the compressor 1. As shown in FIG. 2, a first discharge passage 12 extending from the first compression mechanism 4 to the discharge chamber is provided inside the fixed scroll member 6. The first discharge passage 12 communicates with the discharge chamber 8 through the outlet hole 13. A second discharge passage 17 extending from the second compression mechanism 5 to the discharge chamber 8 is provided inside the fixed scroll member 6. The second discharge passage 17 communicates with the discharge chamber 8 through the outlet hole 18.
[0021]
In the present embodiment, the first compression mechanism 4 is driven only by the vehicle prime mover 19, and the second compression mechanism 5 is driven only by the electric motor 20 built in the compressor 1. The maximum discharge capacity of both compression mechanisms 4 and 5 is set to be larger in the first compression mechanism 4 than in the second compression mechanism 5. For this reason, from the viewpoint of preventing pressure loss, the cross-sectional area of the first discharge passage 12 is set larger than the cross-sectional area of the second discharge passage 17.
[0022]
The first compression mechanism 4 includes a fixed scroll 27 including a fixed scroll member 6 and a spiral wound body 26 formed integrally with the fixed scroll member 6, an end plate 28, and a spiral formed integrally with the end plate 28. A movable scroll 30 including a winding body 29 is provided. The spiral body 26 of the fixed scroll 27 and the spiral body 29 of the movable scroll 30 are engaged with each other at an angle.
[0023]
The main shaft (drive shaft) 31 is disposed substantially in the horizontal direction (left-right direction in FIG. 1), and the hybrid compressor 1 of this embodiment is configured as a horizontal compressor. A crank mechanism 32 is formed at one end of the main shaft 31. The crank pin 33 of the crank mechanism 32 is provided at a position eccentric from the axis of the main shaft 31 and is inserted and fitted to the eccentric bush 34 with a certain play amount. The eccentric bush 34 is rotatably inserted into a drive bearing 35 inserted into the protrusion of the movable scroll 30. The other end of the main shaft 31 is provided with an electromagnetic clutch 36 that transmits power from the vehicle prime mover 19 as a first drive source to the main shaft. The prime mover 19 and the electromagnetic clutch 36 are connected via a pulley 37.
[0024]
The electromagnetic clutch 36 includes a clutch armature 38 fixed to the main shaft 31, and an electromagnet 39 that attaches and detaches the pulley 37 and the clutch armature 38 to turn the clutch 36 on and off.
[0025]
In the present embodiment, when the power from the vehicle running prime mover 19 that drives only the first compression mechanism 4 is transmitted to the main shaft 31 via the electromagnetic clutch 36, the eccentric bush into which the crank pin 33 is inserted and fitted. 34 rotates. Along with this, a turning motion is applied to the movable scroll 30 whose rotation is prevented by the ball coupling 40 as the rotation prevention mechanism.
[0026]
The fluid (for example, refrigerant) sucked into the hybrid compressor 1 from the suction hole 11 as the movable scroll 30 rotates is taken into the spiral body from the outer ends of the spiral bodies 26 and 29. Then, as the fluid pocket formed by the spiral bodies 26 and 29 moves toward the center while reducing its volume, the fluid is compressed and the first discharge passage formed in the fixed scroll member 6 From the inlet hole 9 and the first discharge passage 12 to the high pressure side of the external circuit through the discharge chamber 8 disposed above the compression mechanisms 4 and 5.
[0027]
On the other hand, the second compression mechanism 5 is formed integrally with the fixed scroll 42 including the fixed scroll member 6 and the spiral body 41 formed integrally with the fixed scroll member 6, the end plate 43, and the end plate 43. A movable scroll 45 including a spiral body 44 is provided. In the present embodiment, the fixed scrolls 27 and 42 of the compression mechanisms 4 and 5 are integrally formed with the scroll member 6, and the fixed scrolls 27 and 42 are arranged back to back. Therefore, the enlargement of the main shaft 31 of the hybrid compressor 1 in the axial direction is suppressed, and the compactness as a horizontal compressor is achieved.
[0028]
A crank mechanism 47 is formed at one end of the drive shaft 46. The crank pin 48 of the crank mechanism 47 is provided at a position that is eccentric from the axis of the drive shaft 46, and is inserted and fitted to the eccentric bush 49 with a certain play amount. The eccentric bush 49 is rotatably inserted into a drive bearing 50 provided in the protrusion of the movable scroll 45. In the present embodiment, the second drive source that drives only the second compression mechanism 5 includes an electric motor 20 built in the compressor 1. When the power from the electric motor 20 is transmitted to the rotor 52 fixed to the drive shaft 46, the eccentric bush 49 into which the crank pin 48 is inserted and fitted rotates. Along with this, a turning motion is applied to the movable scroll 45 whose rotation is blocked by the ball coupling 53 as a rotation blocking mechanism. A connector (not shown) is connected to the electric motor 20. Reference numeral 55 denotes a stator of the electric motor 20.
[0029]
The fluid that has flowed into the compressor 1 from the suction hole 11 as the movable scroll 45 turns is swirled from the outer ends of the two spiral bodies 41, 44 engaged with each other by shifting the angle of the second compression mechanism 5. Captured inside. Then, the fluid pocket formed by the spiral bodies 41 and 44 is compressed as it moves toward the center while reducing its volume, and it is compressed into the second discharge passage formed in the fixed scroll member 6. It is sent from the inlet hole 10 and the second discharge passage 17 to the discharge chamber 8.
[0030]
A first discharge valve mechanism 21 that opens and closes the first discharge passage 12 is provided at a position midway from the inlet hole 9 to the outlet hole 13 of the first discharge passage 12. Further, a second discharge valve mechanism 22 for opening and closing the second discharge passage 17 is provided at a position midway from the inlet hole 10 to the outlet hole 18 of the second discharge passage 17.
[0031]
The first discharge valve mechanism 21 (second discharge valve mechanism 22) has a flapper valve body 23 (flapper valve body 24) as shown in FIGS. A plurality of notches 62 (notches 63) are provided in the circumferential direction of the flapper valve body 23 (flapper valve body 24). The flapper valve body 23 (flapper valve body 24) is a discharge valve mechanism forming member 64 (discharge valve mechanism forming member 65) on the inlet hole 9 side (inlet hole 10 side) and discharge on the outlet hole 13 side (outlet hole 18 side). It is loosely fitted in a space 68 (space 69) formed by the valve mechanism forming member 66 (discharge valve mechanism forming member 67).
[0032]
The forming member 64 (forming member 65) is provided with a communication hole 70 (communication hole 71) communicating with the inlet hole 9 side (inlet hole 10 side) of the first discharge passage 12 (second discharge passage 17). . On the other hand, the forming member 66 (forming member 67) is provided with a communication hole 72 (communication hole 73) that communicates with the outlet hole 13 side (the outlet hole 18 side) of the first discharge passage 12 (second discharge passage 17). ing. The communication hole 72 (communication hole 73) is provided with an enlarged diameter portion 74 (expanded diameter portion 75). The inner diameter of the enlarged diameter portion 74 (the enlarged diameter portion 75) is formed larger than the outer diameter dimension a of the flapper valve body 23 (flapper valve body 24). The inner diameter of the communication hole 70 (communication hole 71) is smaller than the inner diameter dimension b of the flapper valve body 23 (flapper valve body 24).
[0033]
Therefore, the compressed fluid flows from the compression mechanism 4 (compression mechanism 5) into the inlet hole 9 (inlet hole 10), and the internal pressure of the discharge passage 12 (discharge passage 17) on the upstream side of the discharge valve mechanism 21 (discharge valve mechanism 22). When the pressure becomes higher than the internal pressure of the discharge chamber 8, the flapper valve body 23 (flapper valve body 24) contacts the forming member 66 (forming member 67). Then, fluid flows from the notch 62 (notch 63) into the communication hole 72 (communication hole 73), and the first discharge passage 12 (second discharge passage 17) is opened. On the other hand, when there is no fluid discharge from the compression mechanism 4 (compression mechanism 5), the internal pressure of the discharge chamber 8 is higher than the internal pressure upstream of the discharge valve mechanism 21 (discharge valve mechanism 22). The valve body 23 (flapper valve body 24) is brought into contact with the forming member 64 (forming member 65), and the discharge passage 12 (discharge passage 17) is closed. That is, the flapper valve body 23 (flapper valve body 24) moves in the vertical direction in FIG. 3 due to the pressure difference between both surfaces.
[0034]
The discharge valve mechanism 21 (discharge valve mechanism 22) is inserted (e.g., press-fitted) from the outlet hole 13 (exit hole 18) after being assembled in advance, and is installed in the middle of the discharge passage 12 (discharge passage 17). It has become.
[0035]
That is, in the hybrid compressor 1 according to the present embodiment, a discharge valve mechanism that opens and closes the discharge passage is provided in the middle of the discharge passage from the compressor to the discharge chamber. Therefore, compared with the case where the discharge valve mechanism is installed on the outlet hole side (exit part) of the discharge passage, the flow path length from the compression mechanism to the discharge valve mechanism can be shortened, and the re-expansion volume can be greatly reduced. A reduction in the compression efficiency of the hybrid compressor can be prevented. Further, the assembly work efficiency of the discharge valve mechanism can be improved as compared with the case where the discharge valve mechanism is installed in the inlet hole (inlet part). Furthermore, since the discharge valve mechanism can be easily installed simply by being inserted into the discharge passage, the assembly work efficiency of the discharge valve mechanism, and hence the assembly work efficiency of the hybrid compression itself can be improved.
[0036]
【The invention's effect】
As described above, when the hybrid compressor according to the present invention is used, since the discharge valve mechanism is provided in the middle of the discharge passage, the discharge valve mechanism is provided at the outlet portion of the discharge passage to the discharge chamber. In comparison, the flow path length from the compression mechanism to the discharge valve mechanism is shortened, and a reduction in compression efficiency can be prevented. Moreover, the assembly work efficiency of the discharge valve mechanism can be greatly improved.
[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 cross-sectional view taken along line II-II of the hybrid compressor of FIG.
3 is a cross-sectional view of a discharge valve mechanism of the hybrid compressor in FIG. 1. FIG.
4 is a plan view of a flapper valve body of the discharge valve mechanism of FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hybrid compressor 2 Front housing 3 Rear housing 4 1st compression mechanism 5 2nd compression mechanism 6 Fixed scroll member 7 Suction chamber 8 Discharge chamber 9, 10 Inlet hole 11 Suction hole 12 First discharge path 13, 18 Outlet hole 17th 2 discharge passage 19 vehicle motor 20 electric motor 21 first discharge valve mechanism 22 second discharge valve mechanism 23, 24 flapper valve bodies 26, 29, 41, 44 spiral bodies 27, 42 fixed scrolls 28, 43 end plates 30, 45 Movable scroll 31 Main shaft (drive shaft)
32, 47 Crank mechanism 33, 48 Crank pin 34, 49 Eccentric bush 35, 50 Drive bearing 36 Electromagnetic clutch 37 Pulley 38 Clutch armature 39 Electromagnet 40, 53 Ball coupling 46 Drive shaft 52 Rotor 55 Stator 56 Through bolt 62, 63 Notches 64, 65, 66, 67 Discharge valve mechanism forming members 68, 69 Spaces 70, 71, 72, 73 Communication holes 74, 75 Expanded diameter portion

Claims (4)

A scroll-type first compression mechanism driven only by the first drive source and a scroll-type second compression mechanism driven only by the second drive source are provided , and the fixed scrolls of both compression mechanisms are arranged back to back. as a hybrid compressor having a leading from both compression mechanisms provided in the stationary scroll member which is integrally formed into the discharge chamber of the compressor, the discharge was independent passages, at least one of the compression mechanism A discharge passage that opens and closes the discharge passage at a midway position of the discharge passage from the compression mechanism to the discharge passage to the discharge chamber to the discharge chamber. A hybrid compressor provided with a valve mechanism.   The hybrid compressor according to claim 1, wherein the discharge valve mechanism is assembled in advance, and the discharge valve mechanism is inserted into the discharge passage.   The hybrid compressor according to claim 1 or 2, wherein the discharge valve mechanism includes a flapper valve body that is loosely fitted to the mechanism by a pressure difference between both surfaces.   The hybrid compressor according to any one of claims 1 to 3, wherein the first drive source is a vehicle prime mover, and the second drive source is an electric motor built in the compressor.

Images