JP2005188443A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the structure of a compressor for preventing a discharge passage from essentially becoming a dead volume to compression operation by arranging a discharge valve at a position extremely close to a discharge hole provided at the center position of each compression mechanism by devising the shape of the discharge valve. <P>SOLUTION: The compressor comprises fixed scrolls of first and second compression mechanisms integrated into a fixed scroll member, and guides a compression medium to a discharge chamber through a discharge passage formed in the fixed scroll member from a discharge hole at the center of each compression mechanism. A discharge valve for controlling the discharge of the compression medium comprises a valve section for controlling the opening/closing of the discharge hole; an elastically deformed arm section that is connected to the valve section and is extended to the exit of the discharge passage along the discharge passage; and a fixed section that is connected to the arm section and is fixed to the fixed scroll member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressor having a discharge valve for controlling the discharge of a compression medium, and more particularly, to a compressor having two scroll-type compression mechanisms, in which fixed scrolls of both compression mechanisms are integrally formed back to back. It relates to the improvement of the valve.

  Recently, the present applicant has developed and proposed a compressor having two scroll-type compression mechanisms, in which fixed scrolls of both compression mechanisms are integrally formed back to back (for example, Patent Document 1). In particular, the compressor is a hybrid compressor in which the first compression mechanism is driven by a first drive source (for example, an automobile engine) and the second compression mechanism is driven by a second drive source (for example, an electric motor with a built-in compressor). Can be configured as In such a hybrid compressor, for example, when the engine is stopped during driving by the engine, switching to driving by the built-in electric motor is possible, or driving by either one or both driving sources as necessary. It is possible to perform an efficient compression operation.

In the compressor as described above, the compression medium discharged from the discharge hole provided in the central portion of each compression mechanism is fixed to the fixed scroll member in which the fixed scrolls of both compression mechanisms are integrally formed back to back. A discharge passage leading to a discharge chamber located radially outside is formed, and a plate-like discharge valve (a valve for controlling discharge) is provided at an outlet portion (an inlet portion to the discharge chamber) of the discharge passage. It was. The discharge valve is configured as a flat lead valve, and an unfixed portion is elastically deformed to control discharge (controlling opening and closing of the discharge passage).
JP 2003-161257 A

  However, the compressor as described above has a structure in which the discharge of the compression medium is controlled by the discharge valve at the outlet of the discharge passage formed in the fixed scroll member. Therefore, it is performed at a position away from the position immediately after the compression operation by each compression mechanism is completed, that is, at a position away from the position of the discharge hole provided in the central portion of each compression mechanism. However, it is a dead volume substantially for the compression operation of the actually ejected compressed medium. This dead volume due to the discharge passage constitutes an integrated fixed scroll member with the fixed scrolls of both compression mechanisms back to back, so that a discharge passage is formed in the fixed scroll member to guide the compressed medium to the discharge chamber. In order to suppress the increase in size and weight of the fixed scroll member, it is necessary to make the discharge passage forming portion as thin as possible. Therefore, the discharge passage has a large diameter (for example, a function equivalent to that of the discharge chamber). This is caused by a structural factor that it is difficult to install a conventional plate-like discharge valve in a small-diameter discharge passage.

  If such a dead volume exists, it is necessary to perform extra compression accordingly, which may increase the temperature of the discharge medium or increase the power consumption.

  Therefore, the problem of the present invention is to pay attention to the conventional problems as described above, and by devising the shape of the discharge valve, it is possible to arrange the discharge valve at a position closest to the discharge hole provided in the central portion of each compression mechanism. Thus, it is an object of the present invention to provide an improved compressor structure in which the discharge passage does not substantially become a dead volume with respect to the compression operation and the performance is improved.

  In order to solve the above-described problems, a compressor according to the present invention includes a first compression mechanism and a second compression mechanism that are integrally formed of a scroll-type compression mechanism, and the fixed scrolls of both compression mechanisms are back-to-back. Compressor configured as an integrated fixed scroll member arranged to guide a compression medium from a discharge hole provided in the center of each compression mechanism to a discharge chamber through a discharge passage formed in the fixed scroll member A discharge valve for controlling the discharge of the compression medium by each compression mechanism; a valve unit for controlling opening and closing of the discharge hole to the discharge passage; and a valve portion connected to the valve portion from the valve portion to the discharge passage. A valve comprising: an elastically deformable arm portion extending to the outlet of the discharge passage; and a fixed portion connected to the arm portion and fixed to the fixed scroll member. That.

  The valve portion or / and the arm portion of the discharge valve is provided with a stopper portion that can come into contact with the inner peripheral surface of the discharge passage located on the side opposite to the discharge hole when the valve portion is opened. It is preferable. By this stopper portion, the maximum lift amount of the valve portion can be regulated to a predetermined amount, and the desired opening degree is controlled.

  The discharge valve can be configured as a member in which a valve portion or a fixed portion is joined to the arm portion. However, it is preferable to configure the discharge valve as a valve that is integrally formed by molding. The integral molding makes it easy to manufacture and allows the arm portion to easily have the desired elasticity. Further, the valve portion is required to close the discharge hole with high accuracy when closed, and to seal the outlet portion of the discharge hole to the discharge passage well. It is necessary to accurately form the shape along the shape. This highly accurate valve shape can be easily achieved by integral molding.

  The compressor according to the present invention is not particularly limited as long as the above-described requirements are satisfied. In particular, the present invention is a hybrid in which the first compression mechanism is driven by the first drive source and the second compression mechanism is driven by the second drive source. It is suitable for a compressor. Especially, it is suitable for the hybrid compressor which can switch drive conditions according to conditions, such as a vehicle, for example, the hybrid compressor which one of the 1st and 2nd drive sources consists of an electric motor with a built-in compressor.

  In the compressor according to the present invention as described above, the discharge valve extends in the discharge passage to the discharge hole portion, and the opening and closing of the discharge hole is controlled by the valve portion provided at the tip through elastic deformation of the arm portion. Will be able to. Therefore, it is possible to control the discharge at a position close to the discharge hole while having a structure with an integral fixed scroll member, making the volume of the discharge passage substantially irrelevant to the compression operation, and greatly reducing the dead volume due to the discharge passage, etc. Can be reduced. As a result, an excessive compression operation is unnecessary, the temperature rise of the discharge medium is suppressed, power consumption is reduced, and the performance of the entire compressor is improved.

  According to the compressor according to the present invention, the dead volume in the discharge path, which affects the efficiency of the compression operation, can be greatly reduced, the temperature rise of the discharge medium can be suppressed, the power consumption can be reduced, Compression efficiency can be improved. Therefore, it is possible to provide a hybrid compressor that is desirable in terms of performance.

Hereinafter, preferred embodiments of a compressor according to the present invention will be described with reference to the drawings.
FIG. 1 shows an example of the structure of a compressor, particularly a hybrid compressor, to which the present invention is applied. In the figure, reference numeral 1 denotes the entire 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 second compression mechanism 5.

  The first compression mechanism 4 includes a fixed scroll 8 composed of a fixed scroll member 6 and a spiral wound body 7 formed integrally with the fixed scroll member 6, an end plate 9 and a spiral formed integrally with the end plate 9. A movable scroll 11 including a winding body 10 is provided. The spiral body 7 of the fixed scroll 8 and the spiral body 10 of the movable scroll 11 are engaged with each other at an angle.

  A crank mechanism 13 is formed at one end of the main shaft (drive shaft) 12. The crank pin 14 of the crank mechanism 13 is provided at a position eccentric from the axis of the main shaft 12 and is inserted and fitted to the eccentric bush 15 with a certain play amount. The eccentric bush 15 is rotatably inserted into a drive bearing 16 inserted into the protrusion of the movable scroll 11. The other end of the main shaft 12 is provided with an electromagnetic clutch 18 that transmits power from a prime mover 17 for vehicle travel as a first drive source to the main shaft. The prime mover 17 and the electromagnetic clutch 18 are connected via a pulley 19. The vehicle driving prime mover 17 is a concept including an engine composed of an internal combustion engine and an electric motor for vehicle driving in an electric vehicle or the like.

  The electromagnetic clutch 18 includes a clutch armature 20 fixed to the main shaft 12, and an electromagnet 21 that attaches and detaches the pulley 19 and the clutch armature 20 to turn the clutch 18 on and off.

  In this embodiment, when the power from the vehicle running prime mover 17 that drives only the first compression mechanism 4 is transmitted to the main shaft 12 via the electromagnetic clutch 18, the eccentric bush into which the crank pin 14 is inserted and fitted. 15 rotates. Accordingly, a turning motion is applied to the movable scroll 11 whose rotation is prevented by the ball coupling 22 as a rotation prevention mechanism.

  The medium (for example, refrigerant) sucked into the hybrid compressor 1 from the suction port 23 formed integrally with the front housing 2 on the first compression mechanism 4 side with the turning motion of the movable scroll 11 is the spiral body 7. 10 is taken into the spiral body from the outer end. Then, as the fluid pocket formed by the spiral bodies 7 and 10 is moved toward the center while reducing its volume, the fluid is compressed, and the compressed medium is discharged to the center. A discharge port 26 provided in the discharge chamber 25 is discharged from a hole 24 a through a first discharge passage 24 formed in the fixed scroll member 6 to a discharge chamber 25 disposed above the compression mechanisms 4 and 5. It flows out to the high voltage | pressure side of an external circuit via.

  On the other hand, the second compression mechanism 5 is formed integrally with the fixed scroll 28 including the fixed scroll member 6 and the spiral body 27 formed integrally with the fixed scroll member 6, the end plate 29, and the end plate 29. A movable scroll 31 including a spiral body 30 is provided. The fixed scrolls 8 and 28 of both the compression mechanisms 4 and 5 are integrally formed with the scroll member 6, and the fixed scrolls 8 and 28 are arranged back to back. Therefore, the enlargement of the main shaft 12 of the hybrid compressor 1 in the axial direction is suppressed, and the compactness as a horizontal compressor is achieved.

  A crank mechanism 33 is formed at one end of the drive shaft 32. The crank pin 34 of the crank mechanism 33 is provided at a position eccentric from the axis of the drive shaft 32 and is inserted and fitted to the eccentric bush 35 with a certain play amount. The eccentric bush 35 is rotatably inserted into a drive bearing 36 provided in the protrusion of the movable scroll 31. In the present embodiment, the second drive source that drives the second compression mechanism 5 includes the electric motor 37. When power from the electric motor 37 is transmitted to the rotor 38 fixed to the drive shaft 32, the eccentric bush 35 into which the crank pin 34 is inserted and fitted rotates. Accordingly, a turning motion is applied to the movable scroll 31 whose rotation is blocked by the ball coupling 39 as a rotation blocking mechanism. A connector 40 is connected to the electric motor 37. Reference numeral 41 denotes a stator of the electric motor 37.

  The medium that has flowed into the compressor 1 from the suction port 23 as the movable scroll 31 turns is sent to the second compression mechanism 5 side through the communication hole 42. And it takes in into the inside of a spiral body from the outer end of both the spiral bodies 27 and 30 meshed | engaged at a different angle. Then, the fluid pocket formed by the spiral bodies 27 and 30 is compressed as it moves toward the center while reducing its volume, and the compressed medium is discharged into the discharge hole 43a formed in the center. Then, the gas is discharged into the discharge chamber 25 through a second discharge passage 43 (formed on the rear side of the first discharge passage 24 in FIG. 1) formed in the fixed scroll member 6.

  In this embodiment, the discharge chamber 25 is formed by a discharge chamber forming portion 44 provided in the rear housing 3 on the second compression mechanism 5 side and radial end portions 45 and 46 of the fixed scroll member 6. The discharge chamber 25 is substantially integrally formed with the rear housing 3.

  A seal member 47 is interposed between the end surface of the discharge chamber forming portion 44 and the end portion 45. On the other hand, a seal member 48 is interposed between the discharge chamber forming portion 44 and the end portion 46. The sealing members 47 and 48 ensure the airtightness of the discharge chamber 25.

  The seal members 47 and 48 may be O-rings, but a sufficient axial force can be secured by the bolts 49 that fasten the front housing 2, the fixed scroll member 6, and the rear housing 3. It is also possible to use a gasket. In this case, it is possible to deal with more complicated contours at a lower cost than when an O-ring is used.

  In the hybrid compressor 1 having the above-described configuration, the discharge valve according to the present invention is configured, for example, as shown in FIGS. 2 and 3 show a discharge valve structure according to one embodiment of the present invention, and FIG. 4 shows a discharge valve structure according to another embodiment. In the following description, configurations applicable to both the discharge hole 24a and the discharge passage 24, and the discharge hole 43a and the discharge passage 44 will be described. However, for convenience of explanation, the discharge hole 24a and the discharge passage 24 side are described. Only will be described.

  In the embodiment shown in FIGS. 2 and 3, the discharge valve 51 includes a valve portion 52 that controls opening and closing of the discharge hole 24 a to the discharge passage 24, and the valve portion 52 connected to the valve portion 52 to the discharge passage 24. And an elastically deformable arm portion 53 extending to the outlet of the discharge passage 24, and a fixed portion 54 connected to the arm portion 53 and fixed to the fixed scroll member 6. The fixing portion 54 is fixed to the fixed scroll member 6 by inserting and fastening the fixing bolt 55 into a bolt hole 56 provided on the upper surface of the fixed scroll member 6. The valve section 52 has a cross-sectional shape that is formed in an arc shape along the inner peripheral surface of the discharge passage 24. When the valve portion 52 is closed, the valve portion 52 is in close contact with the inner peripheral surface of the discharge passage 24 and discharges the discharge passage 24a. The outlet to 24 can be closed in a sealed state.

  With this configuration, the discharge valve 51 can control the opening and closing of the discharge hole 24a using the elastic deformation of the arm portion 53. This open / close control is not performed at the outlet side of the discharge passage 24 as in the prior art, but is performed at a position immediately after the outlet of the discharge hole 24a. Therefore, the dead volume for the compression operation by the compression mechanism is at most a discharge volume. Compared with the case where the volume of the hole 24a is only the dead volume up to the volume of the conventional discharge passage 24, the dead volume is greatly reduced, and the dead volume is substantially absent. As a result, the compression efficiency is improved, the power consumption is reduced, the temperature rise of the compression medium is suppressed, and all the performances as a compressor are improved.

  In the embodiment shown in FIG. 4, when the valve portion 62 is further opened to the discharge valve 61 provided with the valve portion 62, the arm portion 63, and the fixing portion 64, the discharge hole 24 a is positioned on the opposite side. A stopper portion 65 that can contact the inner peripheral surface of the discharge passage 24 is provided. As shown in FIG. 4, the stopper portion 65 may be provided in a form connected to the valve portion 62, may be provided for the arm portion 63, or may be provided for both portions. . By providing the stopper portion 65, the maximum lift amount of the valve portion 62 can be regulated to a predetermined amount, and the desired opening degree is controlled.

  Furthermore, in both the above-described embodiments, the discharge valves 51 and 61 can be configured as members integrally formed by molding, or can be configured as members that are appropriately joined by welding or welding. By constituting the integrally formed member, the manufacture is facilitated, and the discharge valve is manufactured at a low cost.

  In the present invention, the first compression mechanism and the second compression mechanism, which are scroll-type compression mechanisms, are integrally assembled, and the fixed scrolls of both compression mechanisms are configured as an integrated fixed scroll member in which the fixed scrolls are arranged back to back. The present invention can be applied to any compressor, and in particular, can be suitably applied to a hybrid compressor as shown in FIG.

It is a longitudinal cross-sectional view which shows the structural example of the hybrid compressor which can apply this invention. It is a perspective view of the discharge valve of the compressor concerning one embodiment of the present invention. It is a partial longitudinal cross-sectional view of the compressor at the time of mounting | wearing with the discharge valve of FIG. It is a side view of the discharge valve of the compressor concerning another embodiment of the present invention.

Explanation of symbols

1 Compressor (hybrid compressor)
2 Front housing 3 Rear housing 4 First compression mechanism 5 Second compression mechanism 6 Fixed scroll member 7, 10, 27, 30 Spiral wound body 8, 28 Fixed scroll 9, 29 End plate 11, 31 Movable scroll 12 Main shaft (drive shaft) )
DESCRIPTION OF SYMBOLS 13, 33 Crank mechanism 14, 34 Crank pin 15, 35 Eccentric bush 16, 36 Drive bearing 17 Engine for driving | running | working vehicle 18 Electromagnetic clutch 19 Pulley 20 Clutch armature 21 Electromagnet 22, 39 Ball coupling 23 Suction port 24 1st discharge passage 24a, 43a Discharge hole 25 Discharge chamber 26 Discharge port 32 Drive shaft 37 Electric motor 38 Rotor 40 Connector 41 Stator 42 Communication hole 43 Second discharge passage 44 Discharge chamber forming portion 45, 46 End portion 47, 48 Seal member 49 Bolt 51, 61 Discharge valve 52, 62 Valve part 53, 63 Arm part 54, 64 Fixing part 55 Fixing bolt 56 Bolt hole 65 Stopper part

Claims (5)

  A first compression mechanism and a second compression mechanism, each of which is a scroll type compression mechanism, are integrally assembled, and the fixed scrolls of both compression mechanisms are configured as an integrated fixed scroll member in which the fixed scrolls are arranged back to back, and the compression medium is A compressor that guides to a discharge chamber from a discharge hole provided in a central portion of each compression mechanism through a discharge passage formed in the fixed scroll member, and controls discharge of a compression medium by each compression mechanism A valve portion that controls opening and closing of the discharge hole to the discharge passage; and an elastically deformable arm portion that is connected to the valve portion and extends from the valve portion along the discharge passage to the outlet of the discharge passage. And a compressor having a fixed portion connected to the arm portion and fixed to the fixed scroll member.   A stopper portion that can contact the inner peripheral surface of the discharge passage located on the opposite side of the discharge hole when the valve portion is opened to the valve portion and / or the arm portion of the discharge valve. The compressor according to claim 1, wherein   The compressor according to claim 1 or 2, wherein the discharge valve is a valve that is integrally formed by molding.   The compressor according to any one of claims 1 to 3, wherein the first compression mechanism includes a hybrid compressor driven by a first drive source and the second compression mechanism is driven by a second drive source.   The compressor according to claim 4, wherein the first or second drive source is an electric motor with a built-in compressor.

Images