JP4042706B2 - Combined compression device - Google Patents

Description

  The present invention relates to a composite compressor (hybrid compressor) driven by an electric motor and an external drive source other than an electric motor such as an engine, and is effective when applied to a vehicle air conditioner.

As a combined compressor, the driving force supplied from the engine is transmitted to the compression mechanism via the electromagnetic clutch, and when the compression mechanism is driven by the engine, the compression mechanism (discharge) On the other hand, when the compression mechanism is driven by the electric motor, the electromagnetic clutch is turned off and the clutch is disengaged, and the compression mechanism (discharge capacity) is controlled by controlling energization to the electric motor. Yes (see Patent Document 1).
JP-A-4-164169

  By the way, it is not limited to the composite type compression device, and since the impact force when turning on (connecting) the electromagnetic clutch is large, in recent years, the discharge capacity of the fluid discharged from the compression mechanism is changed instead of turning on and off the electromagnetic clutch What uses a so-called variable discharge capacity mechanism is becoming popular.

  Then, as in the invention described in the above publication, a variable discharge capacity mechanism is simply added to a composite compressor that switches between a case where a compression mechanism is driven by an engine and a case where the compression mechanism is driven by an electric motor by an electromagnetic clutch. If only the addition is made, the configuration of the composite compression apparatus becomes complicated, leading to an increase in the manufacturing cost of the composite compression apparatus.

  In view of the above points, an object of the present invention is to simplify the configuration of a composite compression apparatus and reduce the manufacturing cost of the composite compression apparatus by eliminating an electromagnetic clutch in the composite compression apparatus.

  In order to achieve the above object, the present invention uses the following technical means.

The invention according to claim 1 has a housing (101), a fixed part (111) fixed to the housing (101), and a movable part (112) displaced relative to the fixed part (111). A compression mechanism (110) configured to suck and compress fluid, a shaft (102) rotatably disposed in the housing (101) and driving the movable part (112), and an external drive source Of the rotational force transmitted to the shaft (102) side, a first one-way clutch (120) that transmits only the rotational force in the direction for operating the compression mechanism (110) to the shaft (102), and the shaft (102 ), And a variable discharge capacity mechanism (150) for changing the amount of fluid discharged from the compression mechanism (110). The data section (130) includes a stator (131) fixed to the housing (101) and a rotor (132) that rotates within the stator (131), and the rotor (132) and the shaft ( 102), only the rotational force transmitted from the rotor (132) in the direction in which the compression mechanism (110) is operated is transmitted to the shaft (102), and is transmitted by the external drive source. The composite compression apparatus is characterized in that a second one-way clutch (160) is provided to prevent the rotor (132) from rotating when the compression mechanism (110) is driven .

  The invention according to claim 2 is the composite compression device according to claim 1, wherein the compression mechanism (110) and the electric motor part (130) are partitioned by a partition wall disposed between the two, The partition wall prevents the fluid in the compression mechanism (110) from entering the electric motor unit (130).

According to a third aspect of the present invention, in the composite compression device according to the first or second aspect , the shaft (102) is provided with a pulley (103) that receives a rotational force transmitted from the external drive source. The first one-way clutch (120) is arranged between the pulley (103) and the shaft (102).

  According to the above-described invention, since the rotational force from the external drive source is transmitted to the shaft (102) via the first one-way clutch (120), the first one-way clutch (120) transmits the rotational force. The electromagnetic clutch can be abolished if the direction to be obtained coincides with the movable direction of the movable portion (112). Therefore, since the configuration of the composite compression apparatus can be simplified, the manufacturing cost of the composite compression apparatus can be reduced.

  In particular, in the first aspect of the invention, since the second one-way clutch (160) is disposed between the rotor (132) and the shaft (102), the compression mechanism (110) is driven by an external drive source. In this case, the rotor (132) does not rotate, and the rotational force transmitted from the external drive source can be prevented from being consumed for unnecessary work other than operating the compression mechanism (110).

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description later mentioned. However, the reference numerals in parentheses are those used in the specific means described in the representative embodiment when there are a plurality of embodiments corresponding to the means attached with the reference numerals.

(First embodiment)
In the present embodiment, a composite type compression device (hereinafter abbreviated as a compressor) according to the present invention is applied to an air conditioner for a so-called hybrid vehicle that travels with an internal combustion engine such as an engine and an electric motor. is there.

  FIG. 1 is a cross-sectional view of a compressor 100 according to the present embodiment. A compression mechanism 110 that sucks and compresses refrigerant (fluid) is formed in a housing 101 on one axial end side of the compressor 100. In this embodiment, the compression mechanism 110 includes a fixed scroll (fixed portion) 111 fixed to the housing 101 and a movable scroll (movable portion) 112 that revolves (revolves) with respect to the fixed scroll 111. A well-known scroll type compression mechanism is employed. Reference numeral 113 denotes a suction port connected to the outlet side of the evaporator (not shown), 114 denotes a suction chamber, 115 denotes a discharge chamber that absorbs the pulsation of the compressed refrigerant, and 116 denotes a condenser (see FIG. (Not shown) is a discharge port connected to the inlet side.

  Reference numeral 102 denotes a shaft that drives the movable scroll 112. A crank portion 102a that is eccentric by a predetermined amount from the axis of the shaft 102 is formed on one end side of the shaft 102, and the movable scroll 112 rotates on the crank portion 102a. Connected as possible. Reference numeral 102 b denotes a bearing that rotatably holds the shaft 102 in the housing 101.

  On the other hand, on the other end side of the shaft 102, only the rotational force in one direction out of the rotational force transmitted (supplied) from the engine (not shown) to the pulley 103 via the V-belt (not shown) is shaft 102. A first one-way clutch 120 that transmits to the shaft is disposed between the pulley 103 and the shaft 102. Incidentally, as shown in FIG. 2, the first one-way clutch 120 according to this embodiment is a known roller in which a plurality of cylindrical rollers 122, springs 123, and washers 124 are arranged in a holder (holding member) 121. It is a type one-way clutch.

  The direction in which the first one-way clutch 120 can transmit the rotational force coincides with the movable direction of the movable scroll 112. When the pulley 103 rotates in the movable direction of the movable scroll 112, the rotational force is always applied to the shaft 102. It is configured to be transmitted. Further, between the pulley 103 and the compression mechanism 110, an electric motor unit 130 having a stator 131 fixed to the housing 101 and a rotor 132 that rotates in the stator 131 is configured. The shaft 102 is press-fitted and fixed to the rotor 132 so that the shaft 102 and the rotor 132 rotate integrally. Incidentally, in the present embodiment, the electric motor unit 130 is an induction motor type motor.

  By the way, the fixed scroll 111 is formed with a first communication passage 151 that allows the suction chamber 114 and the discharge chamber 115 to communicate with each other. The communication passage 151 is opened and closed by an electromagnetic valve 152. The solenoid valve 152 is controlled by an electronic control unit (ECU) 140 according to a program stored in advance based on the operating state of the engine and the operating state of the air conditioner. Incidentally, the ECU 140 is a well-known device including a central processing unit (CPU), a read / write storage device (RAM) as needed, a read-only storage device (ROM), an input / output port, and the like.

  Further, the fixed scroll 111 is formed with a plurality of second communication passages 153 that allow the working chamber VC formed by the scrolls 111 and 112 and the discharge chamber 115 to communicate with each other, and the discharge of each second communication passage 153 is performed. On the chamber 115 side, a reed valve type check valve 154 for preventing the refrigerant from flowing back from the discharge chamber 115 to the working chamber VC is disposed. Reference numeral 155 denotes a valve stop plate (stopper) that regulates the maximum opening of the check valve 154.

  Next, the operation of the compressor 100 according to this embodiment will be described.

1. When the compression mechanism 110 is operated by the engine during operation of the engine (external drive source), the solenoid valve 152 is closed. As a result, the pressure in the discharge chamber 115 increases with the rotation of the movable scroll 112, so that the check valve 154 provided in the second communication passage 153 that communicates with the working chamber VC having a pressure lower than the pressure in the discharge chamber 115. Is closed. Therefore, the refrigerant is discharged into the discharge chamber 115 only from the working chamber VC that has risen above the pressure in the discharge chamber 115.

2. When the compression mechanism 110 is stopped when the engine is operating, the electromagnetic valve 152 is opened. As a result, since the suction chamber 114 and the discharge chamber 115 communicate with each other, the pressure in the discharge chamber 115 becomes equal to the pressure in the suction chamber 114, so that the refrigerant in the working chamber VC is compressed and rises above the suction pressure. However, the check valve 154 is always open.

  Therefore, the refrigerant sucked into the working chamber VC from the suction chamber 114 returns to the suction chamber 114 via the second communication path 153, the discharge chamber 115, and the first communication path 151. Therefore, since the refrigerant is not discharged from the compressor 100 and circulates in the compressor 100, when viewed from the condenser side, the compressor 100 is in a state equivalent to being stopped.

  As described above, in the present embodiment, the variable discharge capacity mechanism 150 that changes the amount of refrigerant discharged from the compressor 100 by the electromagnetic valve 152, the first and second communication paths 151, 153, and the check valve 154. Is configured.

3. When the compression mechanism 110 is operated by the electric motor unit 130, the electric motor unit 130 (stator 131) is energized with the electromagnetic valve 152 closed, and the movable scroll 112 (shaft 102) is driven to rotate.

  Next, features of the present embodiment will be described. By transmitting the rotational force from the engine to the shaft 102 via the first one-way clutch 120, the electromagnetic clutch can be eliminated as described above. Therefore, since the configuration of the composite compression apparatus can be simplified, the manufacturing cost of the composite compression apparatus can be reduced.

In general, since the one-way clutch can transmit a small and large rotational force, the composite compression apparatus can be prevented from becoming large.
(Second Embodiment)
In the above-described embodiment, the rotor 132 and the shaft 102 of the electric motor unit 130 are integrated. However, in the present embodiment, the first one-way clutch is provided between the rotor 132 and the shaft 102 as shown in FIG. A second one-way clutch 160 having a structure equal to 120 is provided.

  Note that the direction in which the second one-way clutch 160 can transmit the rotational force coincides with the movable direction of the movable scroll 112, similarly to the first one-way clutch 120. For this reason, when the rotor 132 rotates in the movable direction of the movable scroll 112, the shaft 102 always rotates. Accordingly, when the compression mechanism 110 (movable scroll 112) is driven by the engine, the rotor 132 does not rotate, and thus the rotational force transmitted from the engine is consumed for unnecessary work other than operating the compression mechanism 110. Can be prevented. As a result, the fuel consumption rate of the engine can be improved.

  Furthermore, since the induced electromotive force is induced in the stator 131 with the rotation of the rotor 132 and the stator 131 can be prevented from generating heat, the durability of the electric motor unit 130 can be improved. By the way, in the above-described embodiment, the scroll type compression mechanism is adopted as the compression mechanism. However, the present invention is not limited to this. For example, as shown in FIG. A compression mechanism may be adopted.

  As is well known, the variable discharge capacity mechanism in the swash plate type compression mechanism employs a mechanism that changes the discharge capacity by changing the angle of the swash plate 170 by controlling the pressure in the swash plate chamber 171. Is desirable. In the above-described embodiment, the solenoid valve 151 is simply ON / OFF controlled according to the operating state of the engine. However, in addition to the operating state of the engine, the heat load of the air conditioner such as the pressure in the evaporator is also considered. Then, the discharge capacity may be arbitrarily changed by duty-controlling the electromagnetic valve 151.

  The one-way clutches 120 and 160 are not limited to the roller type, and a sprag type one-way clutch may be adopted. In the present specification, for example, “the second one-way clutch 160 is disposed between the rotor 132 and the shaft 102” means that the second power transmission route from the rotor 132 to the shaft 102 is in the middle of the second transmission path. This means that the one-way clutch 160 is disposed, and does not mean only the case where it is physically disposed between the rotor 132 and the shaft 102 as in the second embodiment.

  Similarly, the first one-way clutch 120 may be disposed in the middle of the rotational force transmission path from the pulley 103 to the shaft 102, and the first one-way clutch 120 is not necessarily physically connected between the pulley 103 and the shaft 102. It does not mean only the case where it is arranged in between.

It is sectional drawing of the composite compressor which concerns on 1st Embodiment. It is a schematic diagram of a one-way clutch. It is sectional drawing of the composite compressor which concerns on 2nd Embodiment. It is sectional drawing of the composite compressor which concerns on the modification of this invention.

Explanation of symbols

101 ... Housing, 110 ... Compression mechanism, 120 ... First one-way clutch,
130: Electric motor unit, 160: Second one-way clutch.

Claims (3)

A housing (101);
A compression mechanism (110) configured to include a fixed portion (111) fixed to the housing (101) and a movable portion (112) displaced to the fixed portion (111), and sucks and compresses fluid. When,
A shaft (102) rotatably disposed in the housing (101) and driving the movable part (112);
A first one-way clutch (120) that transmits to the shaft (102) only a rotational force in a direction for operating the compression mechanism (110) among the rotational force transmitted from the external drive source to the shaft (102);
An electric motor section (130) for rotationally driving the shaft (102);
A variable discharge capacity mechanism (150) for changing the amount of fluid discharged from the compression mechanism (110),
The electric motor unit (130) includes a stator (131) fixed to the housing (101) and a rotor (132) rotating within the stator (131).
Between the rotor (132) and the shaft (102), only the rotational force in the direction of operating the compression mechanism (110) among the rotational force transmitted from the rotor (132) is transmitted to the shaft (102). When the compression mechanism (110) is driven by the external drive source, a second one-way clutch (160) is provided to prevent the rotor (132) from rotating. Composite compression device. The compression mechanism (110) and the electric motor unit (130) are partitioned by a partition wall disposed therebetween, and fluid in the compression mechanism (110) is transferred to the electric motor unit (130) by the partition wall. 2. The composite compression apparatus according to claim 1, wherein entry is prevented. The shaft (102) is provided with a pulley (103) that receives a rotational force transmitted from the external drive source,
The composite compression apparatus according to claim 1 or 2 , wherein the first one-way clutch (120) is disposed between the pulley (103) and the shaft (102).

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