JP2005155376A - Composite fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite fluid machine capable of suppressing temperature rise in a control chamber even if a rotary motor part is provided in the control chamber for controlling delivery quantity of a pump part. <P>SOLUTION: In the composite fluid machine provided with a pump part 110 in which a driving body 112 rotated and rocked by a rotary shaft 111 is stored in the control chamber 116 and a piston 114 connected to the driving body 112 is reciprocated, and which sucks and delivery fluid with keeping stroke of the piston 114 variable by controlling rocking amount of the driving body 112, and the rotary motor part 120 provided with both function of a generator and a motor, the rotary motor part 120 is provided in the control chamber 116, bearings 112c, 112d are put in a intermediate part of the driving body 112, and a tip part 112b side thereof connected to the piston 114 is rocked but is not rotated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a composite fluid machine suitable for application to a refrigeration cycle apparatus mounted on a so-called idle stop vehicle or a hybrid vehicle that stops an engine in accordance with a traveling state.

  In recent years, there is an example in which so-called idle stop vehicles and hybrid vehicles are put on the market from the viewpoint of fuel saving. Since these vehicles have an engine stop mode in which the engine is stopped according to the running state, as a compressor in a refrigeration cycle device mounted on the vehicle, for example, a motor and an electromagnetic clutch as shown in Patent Document 1 A hybrid compressor in which is integrated is applied.

This hybrid type compressor has a swash plate type variable displacement type compressor section, and a swash plate is accommodated in a swash plate chamber, and a piston is connected to the front end side of the swash plate via a shoe. The stroke of the piston is variable according to the inclination angle of the swash plate. In consideration of downsizing of the entire hybrid compressor, the motor is arranged in the swash plate chamber.
JP 2000-73948 A

  However, in the above prior art, the mechanical loss that occurs when the compressor operates, that is, the sliding and sliding loss between the swash plate and the shoe, and the loss that occurs when the motor operates or generates electricity, As the temperature rises, for example, there is a problem that the reliability of a shaft seal device or the like that seals the swash plate chamber and the outside of the shaft portion decreases.

  In view of the above problems, an object of the present invention is to provide a composite fluid machine that can suppress a temperature rise in a control chamber even when the rotating electrical machine unit is disposed in a control chamber for controlling the discharge capacity of the pump unit. .

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

  In the first aspect of the present invention, the driving body (112) that is rotated and swung by the rotating shaft (111) is accommodated in the control chamber (116), and the piston (114) connected to the driving body (112) is reciprocated. Then, the swinging amount of the driving body (112) is controlled to change the stroke of the piston (114) so that the fluid is sucked and discharged, and the rotating electrical machine portion (120) having both functions of a generator and an electric motor. ), The rotating electrical machine part (120) is disposed in the control chamber (116), and bearings (112c, 112d) are interposed in the middle part of the driving body (112). The tip (112b) connected to the piston (114) is non-rotating while swinging.

  As a result, the sliding sliding loss in the rotational direction between the tip (112b) of the drive body (112) and the piston (114) can be reduced, thereby suppressing the temperature rise in the control chamber (116). Can do. Therefore, while the rotating electrical machine section (120) is disposed in the control chamber (116) to reduce the size of the composite fluid machine (100), for example, the inside and outside of the control chamber (116) in the rotating shaft (111). The reliability of the shaft seal device (140) or the like that seals can be improved.

  The driving body (112) includes a swash plate (112) that rotates and swings with respect to the rotation shaft (111) in a variable manner with respect to the rotation shaft (111) by the pressure in the control chamber (116). It is preferable to do so, and it is possible to easily cope with it.

  When the driving body (112) is a swash plate (112), the piston (114) is a shoe (113) or a ball joint with respect to the swash plate (112). It may be connected via (113a).

  The invention according to claim 4 is characterized in that the rotating electrical machine part (120) is arranged on the outer peripheral part of the drive body (112).

  As a result, the size in the direction of the rotation axis can be shortened to further reduce the size of the composite fluid machine.

  As in the fifth aspect of the present invention, the rotating electrical machine section (120) may be operable as a main generator of the vehicle by receiving the driving force of the traveling engine (10) of the vehicle. .

  Further, as in the invention described in claim 6, the rotating electrical machine section (120) receives the electric power from the external power supply (20) and can start the traveling engine (10) of the vehicle as an electric motor. It is good and the function can be expanded.

  Further, as in the seventh aspect of the invention, the rotating electrical machine part (120) can be connected to the pump part (110), and the pump part (110) can be driven as an electric motor by receiving power from the external power source (20). The composite fluid machine (100) can be used as an electric pump.

  Further, as in the invention described in claim 8, the pump unit (110) may be driven by receiving the driving force of the vehicle traveling engine (10).

  Furthermore, as in the ninth aspect of the invention, the pump part (110) is suitable for use as a compressor part (110) for sucking and compressing refrigerant in the refrigeration cycle apparatus (200) of the vehicle.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description mentioned later.

(First embodiment)
A first embodiment of the present invention is shown in FIG. 1 to FIG. 4, and first, a specific configuration will be described with reference to FIGS. As shown in FIG. 1, in the first embodiment, the composite fluid machine of the present invention is mounted on a so-called idle stop vehicle in which a traveling engine (hereinafter referred to as an engine) 10 is stopped when the vehicle is temporarily stopped during traveling operation. The hybrid compressor 100 applied to the cycle device 200 is used.

  Here, the refrigeration cycle apparatus 200 is a well-known cooling apparatus, and is provided with a compressor unit 110 constituting a hybrid compressor 100 described later. The compressor unit 110 compresses the refrigerant in the refrigeration cycle apparatus 200 to a high temperature and a high pressure, and hereinafter, a condenser 210 that condenses and liquefies the compressed refrigerant, an expansion valve 220 that adiabatically expands the liquefied refrigerant, An evaporator (cooling heat exchanger) 230 that evaporates the expanded refrigerant and cools the air passing therethrough by its latent heat of vaporization is sequentially connected by a refrigerant pipe 240 to form a closed circuit.

  As shown in FIG. 2, the hybrid compressor 100 includes a compressor part 110 and a motor generator part 120 housed in a housing 101 </ b> A formed by a front housing 101, a middle housing 102, and a rear housing 103. The electromagnetic clutch 130 is provided, and the details thereof will be described below.

  The compressor section (corresponding to the pump section of the present invention) 110 has a discharge capacity per rotation that is variable by a pressure control valve 119, which will be described later. Here, a well-known swash plate type variable displacement compression system is used. It is a machine part.

  A shaft (corresponding to the rotating shaft of the present invention) 111 rotatably supported by bearings 111a and 111b fixed to the front housing 101 and the middle housing 102, respectively, has a swash plate (corresponding to the driving body of the present invention) 112. Is provided. The swash plate 112 mainly includes a drive swash plate 112a constituting a main body and a swing swash plate (corresponding to a tip portion of the present invention) 112b serving as an outer peripheral member, and is formed by a front housing 101 and a middle housing 102. Is accommodated in a swash plate chamber 116 (the control chamber of the present invention).

  A bracket 112e having a long hole 112f is formed integrally with the drive swash plate 112a, and a pin 121c of a support arm 121b of the rotor part 121 described later is fitted into the long hole 112f to form a hinge mechanism. . By this hinge mechanism, the swash plate 112 (drive swash plate 112a) is connected to the rotor portion 121, rotates together with the shaft 111, and tilts from a position near the vertical to the shaft 111 to the maximum tilt position as shown in this figure. It can be done.

  A plurality of pistons 114 are swingably connected to the outer peripheral side of the swing swash plate 112b via a pair of shoes 113, and the pistons 114 reciprocate in a cylinder bore 115 formed in the middle housing 102. I am doing so.

  Here, as a first characteristic part of the present invention, in the swash plate 112, there is a radial bearing (corresponding to an intermediate part of the present invention) between the divided drive swash plate 112a and the swing swash plate 112b. 112c) and a thrust bearing (corresponding to the bearing of the present invention) 112d are interposed. That is, the radial bearing 112c is interposed in the radial direction of the swash plate 112 so that the swing swash plate 112b can rotate with respect to the drive swash plate 112a. The thrust bearing 112d is interposed in the rotational axis direction of the swash plate 112, and enables the swing swash plate 112b to rotate with respect to the drive swash plate 112a while receiving a compression reaction force from the piston 114.

  The middle housing 102 is provided with a rear housing 103 via a valve plate 104, and the rear housing 103 is partitioned into a suction chamber 117 and a discharge chamber 118. The suction chamber 117 communicates with the inside of the cylinder bore 115 through a suction port 117 a provided in the valve plate 104, and the inside of the cylinder bore 115 communicates with the discharge chamber 118 through a discharge port 118 a provided in the valve plate 104. . The suction port 117a and the discharge port 118a are provided with a suction valve and a discharge valve (not shown) so that the refrigerant is sucked, compressed, and discharged by the reciprocating motion of the piston 114. The suction chamber 117 is connected to the evaporator 230 of the refrigeration cycle apparatus 200, and the discharge chamber 118 is connected to the condenser 210 of the refrigeration cycle apparatus 200.

  The rear housing 103 is provided with a pressure control valve 119 for controlling the pressure Pc in the swash plate chamber 116. In the pressure control valve 119, a valve body that slides by energization of the coil is provided. A communication passage (not shown) is provided between the discharge chamber 118 and the swash plate chamber 116 via a valve element, and an exhaust passage is provided between the swash plate chamber 116 and the suction chamber 117. (Not shown) is provided. Then, the valve opening degree of the communication passage is varied by sliding the valve body, so that the discharge chamber 118 and the swash plate chamber 116 are communicated or blocked.

  When the communication passage is held on the opening side by the valve body of the pressure control valve 190, the pressure Pd in the discharge chamber 118 is distributed into the swash plate chamber 116, and the pressure Pc in the swash plate chamber 116 is increased. As a result, the swash plate 112 rises vertically to the shaft 111 to reduce the stroke of the piston 114 and reduce the discharge capacity.

  On the other hand, when the communication passage is closed by the valve body, the pressure distribution from the discharge chamber 118 to the swash plate chamber 116 is stopped. On the other hand, the pressure is released from the swash plate chamber 116 to the suction chamber 117 through the exhaust passage, and the pressure Pc in the swash plate chamber 116 decreases. Then, the inclination angle of the swash plate 112 becomes the maximum inclination position as shown in FIG. 2, and the stroke of the piston 114 is increased to increase the discharge capacity.

  A shaft seal device 140 is provided between the bearing 111a and the tip end side of the shaft 111 to prevent the refrigerant in the swash plate chamber 116 from leaking outside the housing 101A.

  The motor generator unit (corresponding to the rotating electrical machine unit of the present invention) 120 includes a rotor unit 121 and a stator unit 122. The rotor part 121 is provided with a magnet (permanent magnet) 121d on the outer peripheral part of a disc-like rotor main body part 121a fixed to a shaft, and as described above, the support provided on the rotor main body part 121a. The arm 121b and the pin 121c are connected to the swash plate 112. The stator portion 122 is a stator coil wound with a winding, and is disposed on the outer peripheral side of the magnet 121d and is fixed to the inner peripheral surface of the front housing 101.

  As described above, as the second characteristic part of the present invention, the motor generator 120 is arranged in the swash plate chamber 116 and arranged on the outer periphery of the swash plate 112.

  When the electric power from the battery (corresponding to the external power source of the present invention) 20 (FIG. 1) is supplied to the stator unit 122 by the external inverter 30 (FIG. 1), the motor generator unit 120 It operates as an electric motor that drives the compressor unit 110 by rotating 121, and operates as a generator that generates electric power and charges the battery 20 via the inverter 30 when torque for rotating the rotor unit 122 is input. To do.

  The electromagnetic clutch 130 includes a pulley portion 131 that receives power from the engine 10 via the belt 11 (FIG. 1), an excitation coil 132 that generates a magnetic field, and a friction plate that is displaced by electromagnetic force generated by the magnetic field induced by the excitation coil 132. 133 etc.

  The pulley portion 131 is rotatably supported by a pulley bearing 131 a fixed to the front end side of the front housing 101, and the exciting coil 132 is fixed to the front housing 101. The friction plate 133 is fixed to the tip side of the shaft 111.

  When the electromagnetic clutch 130 connects the engine 10 side and the compressor unit 10 side (electromagnetic clutch ON), the energizing coil 132 is energized to disconnect the engine 10 side and the compressor unit 110 side (electromagnetic clutch OFF). Cuts off energization to the exciting coil 132.

  Next, the operation and effect of the hybrid compressor 100 based on the above configuration will be described with reference to FIGS.

  When the vehicle is running by the engine 10 (a in FIG. 3), when the refrigeration cycle apparatus 200 is in an operating state (air conditioner ON), the electromagnetic clutch 130 is turned on (a in FIG. 3), and the compressor Part 110 is operated by the driving force of engine 10. At this time, the pressure Pc in the swash plate chamber 116 is controlled by the pressure control valve 119 according to the required cooling capacity of the refrigeration cycle apparatus 200, the inclination angle of the swash plate 112 is varied, and the refrigerant discharge capacity is varied. . Further, the motor generator unit 120 receives the driving force of the engine 10 and the rotor unit 121 rotates to operate as a main generator of the vehicle (c in FIG. 3). The generated power is charged into the battery 20 via the inverter 30.

  Next, when the vehicle is temporarily stopped and the engine 10 is stopped (D in FIG. 3), the electromagnetic clutch 130 is turned off (O in FIG. 3), and the motor generator unit 120 is connected to the battery. It receives 20 electric power and operates as an electric motor (F in FIG. 3), and operates the compressor unit 110. At this time, similarly to the above, the pressure Pc in the swash plate chamber 116 is controlled by the pressure control valve 119 according to the required cooling capacity of the refrigeration cycle apparatus 200, the inclination angle of the swash plate 112 is varied, and the refrigerant discharge capacity Is variable.

  Further, when the vehicle shifts from the temporary stop to the normal travel, the electromagnetic clutch 130 is turned on (K in FIG. 3), and the motor generator unit 120 operates as an electric motor (K in FIG. 3). Is started (in FIG. 3). Then, the compressor unit 110 is operated again by the driving force of the engine 10, and the motor generator unit 120 is operated as a main generator (co in FIG. 3).

  As described above, in the hybrid compressor 100, the refrigerant is compressed by the compressor unit 110 using the driving force of the engine 10, the battery 20 is charged by the power generation by the motor generator unit 120, and the motor when the engine 10 is stopped is used. It has many functions such as operation of the compressor unit 110 by the generator unit 120 and starting of the engine 10.

  By the way, in the prior art, as explained in the section of the problem at the beginning, when the compressor unit 110 is operated, a sliding sliding loss in the rotational direction (a in FIG. 4) occurs between the swash plate and the shoe. Was. Note that the sliding sliding loss increases with the rotational speed of the compressor unit 110. Furthermore, a power generation loss (b in FIG. 4) also occurs in the motor generator unit 120 that operates together when the compressor unit 110 is operated. When the motor generator unit 120 is disposed in the swash plate chamber 116, the swash plate chamber The temperature inside 116 increased due to the heat generated by the total loss (c in FIG. 4) including the sliding sliding loss a and the power generation loss b, leading to a decrease in the reliability of the shaft seal device 140, for example.

  However, in the present invention, the swash plate 112b is divided into the drive swash plate 112a and the swing swash plate 112b, and the bearings 112c and 112d are interposed between the two swash plates 112a and 112b. The swinging swash plate 112b itself can be made non-rotating while performing only the swinging motion and reciprocating the piston 114 with respect to the rotationally swinging drive swash plate 112a. The sliding loss between the piston 114 (shoe 113) and the piston 114 (shoe 113) can be reduced from a to d as indicated by white arrows in FIG. 4, and the total loss (e in FIG. 4) including the power generation loss b can be reduced. It can be reduced as indicated by the black arrow in FIG. Therefore, the temperature rise in the swash plate chamber 116 can be suppressed, and the reliability of the shaft seal device 140 and the like is improved while the motor generator unit 120 is disposed in the swash plate chamber 116 to reduce the size of the hybrid compressor 100. can do.

  On the high rotation side of the normal compressor section 110, the ratio of the sliding sliding loss a to the total loss c including the sliding sliding loss a and the power generation loss b increases. The degree of reduction of the loss d is large, and an operating range that can be made smaller than the sliding sliding loss a of the conventional compressor unit 110 alone is obtained as the total loss e.

  In addition, as the temperature in the swash plate chamber 116 decreases, an increase in the temperature of the suction refrigerant in the adjacent suction chamber 117 can be suppressed, so that a decrease in volumetric efficiency during refrigerant compression can be suppressed.

  Furthermore, in the present invention, since the motor generator unit 120 is disposed on the outer periphery of the swash plate 112, the size in the shaft direction is shortened, and the hybrid compressor 100 can be further downsized.

(Second Embodiment)
A second embodiment of the present invention is shown in FIG. In the second embodiment, the connection structure between the swash plate 112 and the piston 114 is changed with respect to the first embodiment.

  Here, the swinging swash plate 112b of the swash plate 112 of the first embodiment is a swinging plate 112b1, and is connected to the piston 114 by a ball joint 113a.

  Thereby, the effect similar to the said 1st Embodiment can be acquired.

(Other embodiments)
In the first and second embodiments, the electromagnetic clutch 130 is provided and the driving force of the engine 10 can be used. However, the electromagnetic clutch 130 is eliminated and the compressor unit 110 and the motor generator unit 120 are included. A so-called electric compressor may be used.

  In this case, the swash plate chamber 116 receives a temperature increase in which the operating loss of the motor generator 120 as an electric motor is added to the sliding / sliding loss, but the temperature increase can be suppressed by reducing the sliding / sliding loss.

  Further, the target vehicle is not limited to the idle stop vehicle, and may be applied to a hybrid vehicle that has a traveling engine and a traveling motor and travels by using both appropriately, for example.

1 is a schematic diagram showing an overall configuration in which the present invention is applied to a refrigeration cycle apparatus for a vehicle. It is sectional drawing which shows the hybrid compressor of 1st Embodiment in FIG. It is a time chart which shows the action | operation in 1st Embodiment. It is a graph which shows the inhibitory effect of the loss with respect to rotation speed. It is sectional drawing which shows the hybrid compressor of 2nd Embodiment in FIG.

Explanation of symbols

10 Driving engine 20 Battery (external power supply)
100 Hybrid compressor (composite fluid machine)
110 Compressor part (pump part)
111 Shaft (Rotating shaft)
112 Swash plate (Driver)
112b Oscillating swash plate (tip).
112c Radial bearing (bearing)
112d Thrust bearing (bearing)
113 shoe 113a ball joint 114 piston 116 swash plate chamber (control chamber)
120 Motor generator part (Rotating electrical machine part)
200 Refrigeration cycle equipment

Claims (9)

A drive body (112) that is rotated and oscillated by a rotation shaft (111) is accommodated in a control chamber (116), and a piston (114) connected to the drive body (112) is reciprocated to move the drive body (112). A pump unit (110) for controlling the amount of oscillation of the piston (114) to change the stroke of the piston (114) and sucking and discharging the fluid;
In a composite fluid machine including a rotating electrical machine unit (120) having both functions of a generator and an electric motor,
The rotating electrical machine part (120) is disposed in the control room (116),
Bearings (112c, 112d) are interposed in the middle part of the driving body (112), and the tip part (112b) side connected to the piston (114) is made non-rotating while swinging. A composite fluid machine characterized by the above.   The drive body (112) is a swash plate (112) that is oscillated and oscillated with a variable inclination angle with respect to the rotation shaft (111) by the pressure in the control chamber (116). A composite fluid machine according to claim 1.   The combined fluid machine according to claim 2, wherein the piston (114) is connected to the swash plate (112) via a shoe (113) or a ball joint (113a).   The composite fluid machine according to any one of claims 1 to 3, wherein the rotating electrical machine part (120) is disposed on an outer peripheral part of the driving body (112).   5. The rotating electrical machine section (120) is operable as a main generator of the vehicle in response to a driving force of a vehicle traveling engine (10). The composite fluid machine as described.   6. The rotating electrical machine unit (120) receives a power of an external power source (20) and can start a traveling engine (10) of a vehicle as an electric motor according to any one of claims 1 to 5. The composite fluid machine as described.   The rotating electrical machine part (120) is connected to the pump part (110), and can receive the electric power from an external power source (20) to drive the pump part (110) as an electric motor. The composite fluid machine according to claim 1.   The composite fluid machine according to any one of claims 1 to 7, wherein the pump unit (110) is capable of being driven by receiving a driving force of a traveling engine (10) of a vehicle.   9. The composite according to claim 1, wherein the pump unit (110) is a compressor unit (110) that sucks and compresses a refrigerant in a refrigeration cycle apparatus (200) of a vehicle. Type fluid machine.

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