JP2007285257A - Fluid compression and conveyance device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid compression and conveyance device 1 that is reduced in size and weight, and for reducing noise and vibration thereof. <P>SOLUTION: The fluid compression and conveyance device includes: a compressor 3 for compressing a first working fluid, with a pump 33 for conveying a second working fluid installed in the compressor 3 in parallel or series, and an electric motor 45 in the proximity of the compressor 3, a motor shaft 47 of the electric motor 45 connected and interlocked with a compressor shaft 15 of the compressor 3, and a power transmitting mechanism 69 for transmitting power from the compressor shaft 15 to a pump shaft 35 of the pump 33. The power transmitting mechanism 69 is configured to temporally control a connecting condition between the compressor shaft 15 and the pump shaft 35 or a torque when an excessive rotational torque acts on the compressor 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fluid compression transport device mounted on a vehicle such as a fuel cell vehicle.

  A fuel cell system mounted on a fuel cell vehicle as an example of a vehicle uses a fluid compression / transport device, and the fluid compression / transport device compresses air as a first working fluid and fuel in the fuel cell system. A device that supplies the battery or transports cooling water as a second working fluid into the fuel cell vehicle. The specific configuration of the fluid compression device is as follows.

  That is, an air compressor is provided at an appropriate position of the fuel cell vehicle to compress the air and supply the compressed air to the fuel cell. The air compressor includes a rotatable compressor shaft. A first electric motor that generates electric power by generating electric power is provided in the vicinity of the air compressor. The first electric motor includes a rotatable first motor shaft, and One motor shaft is linked to the compressor shaft.

  A water pump for transporting cooling water into the fuel cell vehicle is provided in the vicinity of the air compressor, and the water pump includes a rotatable pump shaft. In the vicinity of the water pump, a second electric motor that generates electric power by generating electric power is provided. The second electric motor includes a rotatable second motor shaft, and The two motor shafts are linked to the pump shaft.

  Therefore, the compressor shaft is rotated in conjunction with the first motor shaft by generating power by the first electric motor and rotating the first motor shaft. Thus, the air compressor can be driven to compress the air and supply it to the fuel cell.

  Further, power is generated by the second electric motor to rotate the second motor shaft, thereby rotating the pump shaft in conjunction with the second motor shaft. Thereby, the water pump can be driven to transport the cooling water into the fuel cell vehicle.

In addition, there exist some which are shown to patent document 1 and patent document 2 as a prior art relevant to this invention.
JP 11-107970 A JP 2003-120566 A

  By the way, since the air compressor and the water pump are driven by separate electric motors (the first electric motor and the second electric motor), the space of the fluid compression transport device is expanded and the fluid compression transport is performed. There is a problem that the weight of the apparatus increases.

  On the other hand, in order to solve the above-mentioned problem, it is conceivable to drive the air compressor and the water pump by one electric motor by interlockingly connecting the compressor shaft and the pump shaft. However, when the air compressor and the water pump are driven by a single electric motor, the air compressor usually accompanies sudden acceleration / deceleration (rapid acceleration and rapid deceleration). In the pipe connected to the air compressor, cavitation occurs during the sudden acceleration operation of the air compressor, or water hammer occurs during the sudden deceleration operation of the air compressor, which increases the noise and vibration of the fluid compression transport device. There is a problem.

A first feature of the present invention is a fluid compression and transport device that is mounted on a vehicle and compresses a first working fluid or transports a second working fluid.
A compressor having a rotatable compressor shaft and compressing the first working fluid;
A pump which is provided in parallel or in series with the compressor and which has a rotatable pump shaft and transports the second working fluid;
An electric motor provided in the vicinity of the compressor and having a rotatable motor shaft, the motor shaft being interlocked with the compressor shaft, and obtaining power to generate power;
The compressor shaft and the pump shaft are connected to each other, and when excessive rotational torque acts on the compressor shaft, the connection state between the compressor shaft and the pump shaft is temporarily or the torque is controlled. A power transmission mechanism for transmitting power from the compressor shaft to the pump shaft;
It is that it was equipped.

  According to a first aspect of the present invention, the compressor shaft is rotated in conjunction with the motor shaft by generating power by the electric motor and rotating the motor shaft, and the power transmission mechanism Power is transmitted from the compressor shaft to the pump shaft, causing the pump shaft to rotate in conjunction with the compressor shaft. Thereby, the compressor and the pump can be driven by one electric motor to compress the first working fluid or transport the second working fluid.

  Further, when the sudden acceleration operation or sudden deceleration operation of the compressor occurs, excessive rotational torque acts on the compressor shaft. On the other hand, as described above, the power transmission means is configured such that when excessive rotational torque acts on the compressor shaft, the connection state between the compressor shaft and the pump shaft is temporarily or the torque is controlled. Therefore, if excessive rotational torque acts on the compressor shaft, power is not temporarily transmitted from the compressor shaft to the pump shaft. Thereby, it is possible to suppress the occurrence of cavitation during the rapid acceleration operation of the compressor or the occurrence of water hammer during the rapid deceleration operation of the compressor in the pump or the pipe connected to the pump.

According to a second aspect of the present invention, there is provided a fluid compressing and transporting device which is mounted on a vehicle and compresses the first working fluid or transports the second working fluid.
A compressor having a rotatable compressor shaft and compressing the first working fluid;
A pump provided in series with the compressor, having a rotatable pump shaft, and transporting a second working fluid;
A pair of rotatable motor shafts is provided between the compressor and the pump, and one motor shaft of the pair of motor shafts is linked to the compressor shaft to obtain electric power. A double-shaft electric motor that generates power;
Provided to connect the other motor shaft of the pair of motor shafts and the pump shaft, and when excessive rotational torque acts on the other motor shaft, the connection state between the other motor shaft and the pump shaft A power transmission mechanism configured to transmit torque from the other motor shaft to the pump shaft.
It is that it was equipped.

  According to a second aspect of the present invention, power is generated by the electric motor, and the pair of motor shafts are rotated to rotate the compressor shaft in conjunction with the one motor shaft, and the power Power is transmitted from the other motor shaft to the pump shaft by the transmission mechanism, and the pump shaft rotates in conjunction with the other motor shaft. Thereby, the compressor and the pump can be driven by one electric motor to compress the first working fluid or transport the second working fluid.

  Further, when the sudden acceleration operation or sudden deceleration operation of the compressor occurs, excessive rotational torque acts on the compressor shaft. On the other hand, as described above, when the excessive torque is applied to the other motor shaft, the power transmission means temporarily controls the connection state between the other motor shaft and the pump shaft or the torque. Therefore, when excessive rotational torque acts on the other motor shaft, power is not temporarily transmitted from the other motor shaft to the pump shaft. Thereby, it is possible to suppress the occurrence of cavitation during the rapid acceleration operation of the compressor or the occurrence of water hammer during the rapid deceleration operation of the compressor in the pump or the pipe connected to the pump.

  According to the present invention, the compressor and the pump can be driven by the one electric motor, and cavitation is generated in the pump or the pipe during the rapid acceleration operation of the compressor, Since it is possible to suppress the occurrence of water hammer during sudden deceleration operation, it is possible to reduce the noise and vibration of the fluid compression transport device while reducing the space and weight of the fluid compression transport device. .

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  Here, FIG. 1 is a diagram showing a fluid compression / transport device according to the first embodiment, and FIG. 2 is a cross-sectional view showing a fluid coupling in the fluid compression / transport device according to the first embodiment. In the drawings, “L” indicates the left direction, and “R” indicates the right direction.

  As shown in FIGS. 1 and 2, a fluid compression transport device 1 according to an embodiment of the present invention is used in a fuel cell system mounted on a fuel cell vehicle, and uses air as a first working fluid. It is a device that compresses and supplies the fuel cell to the fuel cell in the fuel cell system, and transports cooling water as a second working fluid into the fuel cell vehicle. And the specific structure of the fluid compression transport apparatus 1 is as follows.

  That is, a screw type air compressor 3 that compresses air and supplies it to the fuel cell is provided at an appropriate position of the fuel cell vehicle. The air compressor 3 includes a compressor case 5. A discharge port 7 for discharging high-pressure air is formed near the right end (near one end) of the compressor case 5. A suction port 9 for sucking air is formed at (the other end).

  A female rotor 11 is rotatably provided in the compressor case 5 via a plurality of bearings 13. The female rotor 11 includes a female rotor shaft 15 (one of the compressor shafts) rotatably supported by a plurality of bearings 13, and a plurality of spiral concave female spirals provided integrally with the female rotor shaft 15. 17.

  A male rotor 19 is rotatably provided in the compressor case 5 via a plurality of bearings 21. The male rotor 19 includes a male rotor shaft 23 (one of the compressor shafts) that is rotatably supported by a plurality of bearings 21 and a spiral projection that is provided integrally with the male rotor shaft 23 and meshes with the female spiral 17. And a plurality of male spirals 25.

  A gear box 27 is provided on the right side of the compressor case 5, and the female rotor shaft 15 and the male rotor shaft 23 protrude from the compressor case 5 into the gear box 27. Further, in order to interlock and connect the female rotor 11 and the male rotor 19 so as to rotate in the opposite directions, a female rotor gear 29 is integrally provided in the vicinity of the right end of the female rotor shaft 15. A male rotor gear 31 meshed with the female rotor gear 29 is integrally provided in the vicinity of the right end of 23.

  In the vicinity of the fuel cell vehicle, a water pump 33 for transporting cooling water into the fuel cell vehicle is provided in parallel with the air compressor 3, and the water pump 33 includes a rotatable pump shaft 35. Yes. Further, the water pump 33 has an inlet port 37 at the left end, and this inlet port 37 is connected to a tank (not shown) via a tank side pipe 39. Further, the water pump 33 has an outlet port 41 in the vicinity of the right end, and this outlet port 41 is connected to a cooling component via a fuel cell vehicle side pipe 43.

  On the right side of the gear box 27 (in the vicinity of the air compressor 3 in other words), an electric motor 45 that generates electricity and generates power is provided. The electric motor 45 includes a rotatable motor shaft 47. Yes. The motor shaft 47 is located in the gear box 27 and is coupled to the female rotor shaft 15 in a coaxial manner by a coupling 49. The motor shaft 47 may be coaxially linked to the male rotor shaft 23 instead of being linked to the female rotor shaft 15 in a coaxial manner.

  In the gear box 27, a transmission shaft 51 is rotatably provided via a bearing 53 and coaxial with the pump shaft 35. An intermediate shaft is provided between the female rotor shaft 15 and the transmission shaft 51 in the gear box 27. 55 is rotatably provided via a bearing 57. In order to interlock the female rotor shaft 15 and the transmission shaft 51, a main driving gear 59 is integrally provided near the right end of the female rotor shaft 15, and a driven gear 61 is integrally formed on the transmission shaft 51. The intermediate shaft 55 is integrally provided with an intermediate driven gear 63 meshed with the main driving gear 59 and an intermediate main driving gear 65 meshed with the driven gear 61, respectively.

  A protective case 67 is provided between the water pump 33 and the gear box 27, and in the protective case 67 from the transmission shaft 51 to the pump shaft 35 (in other words, from the female rotor shaft 15 to the pump shaft). 35) A fluid coupling 69 is provided as a power transmission mechanism for transmitting power. Further, as shown in FIG. 2, the configuration of the fluid coupling 69 itself is general, and the fluid coupling 69 is integrated with the driven impeller 71 provided integrally with the pump shaft 35 and the transmission shaft 51. And a main impeller 73 that transmits a rotational force to the driven impeller 71 via an internal fluid, and a joint case 75 that is provided integrally with the main impeller 73. In the fluid coupling 69, when excessive rotational torque acts on the transmission shaft 51 (in other words, the female rotor shaft 15), a part of the rotational torque is converted into heat of the internal fluid, and the transmission shaft 51 and the pump The connection state with the shaft 35 (in other words, the connection state between the female rotor shaft 15 and the pump shaft 35) is temporarily released.

  Next, the operation and effect of the first embodiment will be described.

  By generating power by the electric motor 45 and rotating the motor shaft 47, the female rotor shaft 15 and the male rotor shaft 23 are rotated in conjunction with the motor shaft 47, and from the female rotor shaft 15 by the fluid coupling 69 ( Power is transmitted to the pump shaft 35 (via the intermediate shaft 55 and the transmission shaft 51), causing the pump shaft 35 to rotate in conjunction with the female rotor shaft 15. Thus, the air compressor 3 and the water pump 33 can be driven by one electric motor 45, and the plurality of female rotors 11 and the plurality of male rotors 19 are rotated in synchronization to compress air in the compressor case 5. Thus, it can be supplied to the fuel cell, or the cooling water can be transported into the fuel cell vehicle.

  Further, if the air compressor 3 undergoes a sudden acceleration operation or a sudden deceleration operation, excessive rotational torque acts on the female rotor shaft 15. On the other hand, as described above, the fluid coupling 69 is configured such that the connection state between the female rotor shaft 15 and the pump shaft 35 is temporarily released when excessive rotational torque acts on the female rotor shaft 15. When excessive rotational torque acts on the female rotor shaft 15, power is temporarily not transmitted from the female rotor shaft 15 to the pump shaft 35 (via the intermediate shaft 55 and the transmission shaft 51). Thereby, in the water pump 33 or the pipes 39 and 43, it is possible to suppress the occurrence of cavitation during the rapid acceleration operation of the air compressor 3 or the occurrence of water hammer during the rapid deceleration operation of the air compressor 3. .

  Therefore, according to the first embodiment, the air compressor 3 and the water pump 33 can be driven by one electric motor 45, and the rapid acceleration operation of the air compressor 3 in the water pump 33 or the pipes 39 and 43 is possible. It is possible to suppress the occurrence of cavitation from time to time and the occurrence of water hammer when the air compressor 3 is suddenly decelerated. Therefore, the fluid compression and transportation device 1 can be saved while saving space and weight. 1 noise and vibration can be reduced.

  The present invention is not limited to the description of the first embodiment. For example, the water pump 33 may be provided in series with the air compressor 3 instead of being provided in parallel with the air compressor 3. Further, instead of the fluid coupling 69, a torque converter or a torque limiter may be used as the power transmission mechanism.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG.

  Here, FIG. 3 is a figure which shows the fluid compression transport apparatus concerning 2nd Embodiment. In the drawings, “L” indicates the left direction, and “R” indicates the right direction.

  As shown in FIG. 3, the fluid compression transport device 77 according to the second embodiment is used for a fuel cell system mounted on a fuel cell vehicle, similarly to the fluid compression transport device 1 according to the first embodiment. In this device, the air as the first working fluid is compressed and supplied to the fuel cell in the fuel cell system, or the cooling water as the second working fluid is transported into the fuel cell vehicle. The fluid compressing and transporting apparatus 77 according to the second embodiment has substantially the same configuration as that of the fluid compressing and transporting apparatus 1 according to the first embodiment. Only the part will be described. In addition, about the component corresponding to the component in the fluid compression transport apparatus 1 among several components in the fluid compression transport apparatus 77, the same number is attached | subjected in a figure and description is abbreviate | omitted.

  That is, the water pump 33 is provided in series with the air compressor 3, and a double-shaft electric motor 79 different from the electric motor 45 is provided on the gear box 27 and the right side (in other words, in the vicinity of the air compressor 3). Is provided. The electric motor 79 includes a pair of rotatable motor shafts 81 and 83, and one of the pair of motor shafts 81 and 83 is coaxial with the female rotor shaft 15 by a coupling 85. Are linked to each other.

  A protective case 87 is provided between the gear box 27 and the water pump 33. Within the protective case 87, the other motor shaft 83 of the pair of motor shafts 81, 83 is connected to the pump shaft 35. A fluid coupling 89 is provided as a power transmission mechanism for transmitting power. The fluid coupling 89 itself has a general configuration, and the fluid coupling 89 is provided integrally with the driven impeller 91 provided integrally with the pump shaft 35 and the other motor shaft 83. A main impeller 93 that transmits a rotational force to the driven impeller 91 via an internal fluid, and a joint case 95 provided integrally with the main impeller 93 are provided. In the fluid coupling 89, when excessive rotational torque acts on the other motor shaft 83, a part of the rotational torque is converted into heat of the internal fluid, and the connection state between the other motor shaft 83 and the pump shaft 35 is obtained. Is configured to be temporarily released.

  Next, the operation and effect of the second embodiment will be described.

  Power is generated by the electric motor 79 and the pair of motor shafts 81 and 83 are rotated in the opposite direction in synchronization with each other, whereby the female rotor shaft 15 is rotated in conjunction with one motor shaft 81 and the fluid coupling 89 is rotated. Thus, power is transmitted from the other motor shaft 83 to the pump shaft 35, and the pump shaft 35 is rotated in conjunction with the other motor shaft 83. Thus, the air compressor 3 and the water pump 33 can be driven by one electric motor 79, and the plurality of female rotors 11 and the plurality of male rotors 19 are rotated in synchronization to compress air in the compressor case 5. Thus, it can be supplied to the fuel cell, or the cooling water can be transported into the fuel cell vehicle.

  Further, when the sudden acceleration operation or the sudden deceleration operation of the air compressor 3 occurs, an excessive rotational torque acts on the other motor shaft 83. On the other hand, as described above, the fluid coupling 89 is configured such that the connection state between the other motor shaft 83 and the pump shaft 35 is temporarily released when excessive rotational torque acts on the other motor shaft 83. Therefore, if excessive rotational torque acts on the other motor shaft 83, power is not temporarily transmitted from the other motor shaft 83 to the pump shaft 35. Thereby, in the water pump 33 or the pipes 39 and 43, it is possible to suppress the occurrence of cavitation during the rapid acceleration operation of the air compressor 3 or the occurrence of water hammer during the rapid deceleration operation of the air compressor 3. .

  Therefore, according to the second embodiment, the air compressor 3 and the water pump 33 can be driven by one electric motor 79, and the rapid acceleration operation of the air compressor 3 in the water pump 33 or the pipes 39 and 43 is possible. Since it is possible to suppress the occurrence of cavitation from time to time and the occurrence of water hammer during the rapid deceleration operation of the air compressor 3, it is possible to save space and reduce the weight of the fluid compression and transportation device 89 while reducing the amount of fluid. 77 noise and vibration can be reduced.

  The present invention is not limited to the description of the second embodiment. For example, a torque converter or a torque limiter may be used instead of the fluid coupling 89 as a power transmission mechanism.

  As described above, the present invention has been described with reference to some preferred embodiments. However, the scope of rights encompassed by the present invention is not limited to these embodiments.

It is a figure which shows the fluid compression transport apparatus concerning 1st Embodiment, Comprising: A partial cross section is shown. It is sectional drawing which shows the fluid coupling in the fluid compression transport apparatus concerning 1st Embodiment. It is a figure which shows the fluid compression transport apparatus concerning 2nd Embodiment, Comprising: A partial cross section is carried out.

Explanation of symbols

1 Fluid compression transport device 3 Air compressor 15 Female rotor shaft (compressor shaft)
33 Water pump 35 Pump shaft 45 Electric motor 47 Motor shaft 69 Fluid coupling 77 Fluid compression transport device 79 Electric motor 81 One motor shaft 83 The other motor shaft 89 Fluid coupling

Claims (3)

In a fluid compression and transportation device mounted on a vehicle and compressing a first working fluid or transporting a second working fluid,
A compressor having a rotatable compressor shaft and compressing the first working fluid;
A pump which is provided in parallel or in series with the compressor and which has a rotatable pump shaft and transports the second working fluid;
An electric motor provided in the vicinity of the compressor and having a rotatable motor shaft, the motor shaft being interlocked with the compressor shaft, and obtaining power to generate power;
The compressor shaft and the pump shaft are connected to each other, and when excessive rotational torque acts on the compressor shaft, the connection state between the compressor shaft and the pump shaft is temporarily or the torque is controlled. A power transmission mechanism for transmitting power from the compressor shaft to the pump shaft;
A fluid compressing and transporting apparatus characterized by comprising: In a fluid compression and transportation device mounted on a vehicle and compressing a first working fluid or transporting a second working fluid,
A compressor having a rotatable compressor shaft and compressing the first working fluid;
A pump provided in series with the compressor, having a rotatable pump shaft, and transporting a second working fluid;
A pair of rotatable motor shafts is provided between the compressor and the pump, and one motor shaft of the pair of motor shafts is linked to the compressor shaft to obtain electric power. A double-shaft electric motor that generates power;
Provided to connect the other motor shaft of the pair of motor shafts and the pump shaft, and when excessive rotational torque acts on the other motor shaft, the connection state between the other motor shaft and the pump shaft A power transmission mechanism configured to transmit torque from the other motor shaft to the pump shaft.
A fluid compressing and transporting apparatus characterized by comprising:   The fluid compression transport device according to claim 1, wherein the power transmission mechanism is any one of a fluid coupling, a torque converter, and a torque limiter.

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