JP2011021540A - Screw compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw compressor outputting rotational driving force to the outside with a reduced outer shape. <P>SOLUTION: The screw compressor 1 includes a pair of spiral rotors 3, 4, and a casing 2 pivotally supporting the pair of rotors 3, 4 in a meshed state with each other. The screw compressor has an output gear part 5 outputting the rotational driving force to the outside by using rotational driving force of at least one rotor 3 between the pair of rotors 3, 4, at least one driven gear part 6 provided between the one rotor 3 and the output gear part 5 and adjusting the rotation speed of the output gear part 5 in cooperation with the one rotor 3 and the output gear part 5, and a fixed shaft 25 supported by the casing 2. The driven gear part 6 is rotatably provided on the fixed shaft 25 via a bearing part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

 The present invention relates to a screw compressor.

 2. Description of the Related Art Conventionally, screw compressors that have a pair of spirally formed rotors and compress gas by rotating the pair of rotors in opposite directions have been used. This screw compressor is installed in a vehicle, a refrigeration / refrigeration apparatus, etc., for example, in a vehicle, compresses air and supercharges the compressed air to the engine, and in the refrigeration / refrigeration apparatus, it is used to compress refrigerant gas. It has been.

By the way, in vehicles and the like, it has become necessary to provide a new driving device. This drive device is for driving a pump that circulates a fluid (such as pure water) used in a fuel cell, for example. However, in response to a request for a compact vehicle body for improving fuel efficiency and an increase in a passenger's boarding space, a space (such as an engine room) in which the drive device is installed in the vehicle tends to be reduced. For this reason, it has been difficult to provide a new drive device in the vehicle.
Therefore, Patent Document 1 discloses a screw compressor that can output the rotational driving force to the outside using the rotational driving force of the rotor. By using this screw compressor, the pump and the like can be driven without providing a new driving device in the vehicle.

JP 2007-285257 A

However, the following problems exist in the above-described prior art.
The screw compressor disclosed in Patent Document 1 has an output gear portion that outputs a rotational driving force to the outside, and a driven gear portion provided between one rotor and the output gear portion. The driven gear portion has a shaft that is connected to the two gears through the central portion thereof, and this shaft is rotatably provided on the casing (outer shell member) of the screw compressor via the bearing portion. It has been.
Therefore, the space for providing the said bearing part in a casing is needed, and the subject that size reduction of a screw compressor was difficult occurred.

 The present invention has been made in consideration of the above points, and an object of the present invention is to provide a screw compressor capable of reducing the outer shape of a screw compressor capable of outputting a rotational driving force to the outside.

In order to solve the above problems, the present invention employs the following means.
A screw compressor according to the present invention is a screw compressor including a pair of spiral rotors and a casing that rotatably supports the pair of rotors in mesh with each other, and at least of the pair of rotors. An output gear unit that outputs a rotational driving force to the outside using the rotational driving force of one rotor, and an output gear unit provided between the one rotor and the output gear unit, in cooperation with one rotor and the output gear unit. A configuration in which at least one driven gear portion that adjusts the rotation speed of the gear portion and a fixed shaft supported by the casing are provided, and the driven gear portion is rotatably provided on the fixed shaft via the bearing portion. Is adopted.
In the present invention employing such a configuration, since the bearing portion is provided in the driven gear portion, it is necessary to rotatably support the driven gear portion as compared with the support method in which the bearing portion is provided in the casing. Space is reduced.

In the screw compressor of the present invention, the driven gear portion has a first gear and a second gear having a diameter larger than that of the first gear, and the first gear and the second gear have their central axes on the same axis. A configuration is adopted in which the second gear has a plurality of holes that are integrally connected in the arranged posture and penetrate in the central axis direction.
In the present invention adopting such a configuration, when the screw compressor is assembled, the meshing of the first gear and the output gear portion, or the meshing of the first gear and the gear provided on one rotor, It becomes possible to assemble while confirming using a plurality of holes. Further, in the present invention, the driven gear portion is reduced in weight.

Moreover, the screw compressor of this invention employ | adopts the structure that the some hole part is provided in the circumferential direction of the 2nd gear at substantially equal intervals.
In the present invention employing such a configuration, it is possible to confirm the meshing regardless of which direction the driven gear portion rotates around its central axis. Moreover, in this invention, the balance regarding rotation of a driven gear part is maintained favorable.

According to the present invention, the following effects can be obtained.
According to the present invention, in the screw compressor that can output the rotational driving force to the outside, there is an effect that the outer shape can be reduced.

1 is an overall configuration diagram of a screw compressor 1. FIG. It is an enlarged view of the driven gear part 6. FIG.

 Hereinafter, an embodiment of the screw compressor of the present invention will be described with reference to FIGS. 1 and 2. In each drawing used for the following description, the scale of each member is appropriately changed so that each member can be recognized. Moreover, the arrow F in each drawing has shown the front direction.

FIG. 1 is an overall configuration diagram of a screw compressor 1 in the present embodiment, where (a) is a cross-sectional view and (b) is a cross-sectional view taken along line AA of (a).
The screw compressor 1 is a device that is provided in a vehicle or the like and compresses a predetermined gas and outputs a rotational driving force to the outside. The screw compressor 1 includes a casing 2, a first rotor (rotor, one rotor) 3, a second rotor (rotor) 4, an output gear portion 5, and a driven gear portion 6.

 The casing 2 is a member constituting the outer shell of the screw compressor 1, and includes a compression chamber 21 that is a space in which gas is compressed, a gear chamber 22 that is a space in which the output gear portion 5 and the like are disposed, A gas inlet (not shown) that communicates with the chamber 21 and introduces gas into the compression chamber 21; and a gas outlet (not shown) that discharges the compressed gas communicated with the compression chamber 21. Yes.

 The first rotor (rotor, one rotor) 3 is one of a pair of rotors that compress gas, and includes a first rotor shaft 31, a rotor gear 32, a first timing gear 33, and a first rotor body 34. have.

 The first rotor shaft 31 extends in the front-rear direction, and is rotatably provided on the casing 2 via a plurality of first bearings 23. In addition, a motor M, which is a driving device that rotates the first rotor 3, is integrally connected to the rear end portion of the first rotor shaft 31. The motor M may be another driving device (for example, an engine or the like), and a transmission gear or the like may be provided between the driving device and the first rotor 3.

The rotor gear 32 is a gear for transmitting the driving force of the rotation of the first rotor 3 to the driven gear portion 6 and rotating the driven gear portion 6, and is provided integrally on the rear end side of the first rotor shaft 31. It has been.
The first timing gear 33 is a gear for transmitting the driving force of rotation of the first rotor 3 to the second rotor 4 to rotate the second rotor 4, adjacent to the front side of the rotor gear 32, and One rotor shaft 31 is integrally provided on the rear end side.
The rotor gear 32 and the first timing gear 33 are both installed in the gear chamber 22.

 The first rotor body 34 is a so-called female rotor that compresses gas by rotating together with a second rotor body 44 described later, and a plurality of protrusions (for example, five) spiral around the axis of the first rotor shaft 31. It is the structure formed in the shape. The first rotor body 34 is installed in the compression chamber 21.

The second rotor (rotor) 4 is the other of the pair of rotors that compress gas, and includes a second rotor shaft 41, a second timing gear 43, and a first rotor body 44.
The second rotor shaft 41 is a shaft extending in the front-rear direction, and is rotatably provided on the casing 2 via the plurality of first bearings 23.

 The second timing gear 43 is a gear for rotating the second rotor 4 in cooperation with the first timing gear 33, meshing with the first timing gear 33 and the rear end portion of the second rotor shaft 41. Are integrally provided. The diameter of the second timing gear 43 is formed larger than the diameter of the first timing gear 33, and the ratio between the number of teeth of the second timing gear 43 and the number of teeth of the first timing gear 33 is 5: 3. Is set. The second timing gear 43 is installed in the gear chamber 22.

 The second rotor body 44 is a so-called male rotor that compresses gas by rotating together with the first rotor 34, and a plurality of protrusions (for example, three) are formed in a spiral shape around the axis of the second rotor shaft 41. It has been configured. Further, the second rotor body 44 is provided in the compression chamber 21 in a state where the protrusion meshes with the protrusion of the first rotor body 34.

 The output gear portion (output portion, output gear portion) 5 outputs a rotational driving force to the outside of the screw compressor 1 and has an output gear main body 51. A drive shaft 7 that is provided outside the screw compressor 1 and extends from an unillustrated device (for example, a pump or the like) that requires rotational driving force is integrally connected to the output gear main body 51 using bolts 52. Yes. The drive shaft 7 is rotatably provided on the casing 2 via a plurality of second bearings 24. Therefore, the output gear main body 51 is also rotatably provided on the casing 2 via the drive shaft 7 and the second bearing 24. The output gear body 51 is installed in the gear chamber 22.

 The driven gear portion 6 transmits the driving force of the rotation of the first rotor 3 to the output gear portion 5 and rotates the output gear portion 5. The driven gear portion 6 is provided between the first rotor 3 and the output gear portion 5. It has been. The driven gear portion 6 is installed in the gear chamber 22. Here, the detail of the driven gear part 6 is demonstrated with reference to FIG.

FIG. 2 is an enlarged view of the driven gear portion 6 in FIG.
As shown in FIG. 2, the driven gear unit 6 includes a cylindrical member 61, a first gear 62, and a second gear 63.

 The cylindrical member 61 is a member formed in a substantially cylindrical shape, and is provided rotatably on a fixed shaft 25 described later via a plurality of third bearings (bearing portions) 64. The fixed shaft 25 is a shaft extending in the front-rear direction, and is press-fitted into a hole 26 formed in the casing 2 and is integrally connected to the casing 2. By adopting such an installation method of the cylindrical member 61, the driven gear portion 6 includes a shaft extending in the front-rear direction, and the shaft is rotatably provided in the casing 2 via a bearing such as a predetermined bearing. In comparison, the space required to support the driven gear portion 6 can be suppressed, and the external shape of the screw compressor 1 can be reduced.

 The first gear 62 is a gear that is provided on the outer peripheral surface of the cylindrical member 61 and is installed at a substantially central portion of the cylindrical member 61 in the front-rear direction. The first gear 62 is provided in mesh with the output gear main body 51, the diameter of the first gear 62 is formed smaller than the diameter of the output gear main body 51, and the number of teeth of the first gear 62 is the number of teeth of the output gear main body 51. It is set less than the number of teeth. The cylindrical member 61 and the first gear 62 are formed from a single member.

 The second gear 63 is installed on the outer peripheral surface of the cylindrical member 61 and adjacent to the rear side of the first gear 62. A second hole 63a penetrating in the front-rear direction is formed in a substantially central portion of the second gear 63, and the cylindrical member 61 is press-fitted into the second hole 63a, so that the cylindrical member 61, the second gear 63, Are connected together. The second gear 63 is provided in mesh with the rotor gear 32, the diameter of the second gear 63 is formed larger than the diameter of the rotor gear 32, and the number of teeth of the second gear 63 is set larger than the number of teeth of the rotor gear 32. Has been.

 As shown in FIG. 1B, the second gear 63 has a plurality of third holes (holes) 63b penetrating in the front-rear direction. The plurality of third hole parts 63 b are arranged at substantially equal intervals in the circumferential direction of the second gear 63. The third hole 63b is provided at a position where the meshing portion between the output gear main body 51 and the first gear 62 can be confirmed from the rear side of the second gear 63 through the third hole 63b. Therefore, when the screw compressor 1 is assembled, when the output gear body 51 and the first gear 62 are meshed with each other, the meshing is performed using the plurality of third holes 63b regardless of the rotational position of the second gear 63. As a result, the assembly can be performed quickly and easily, and the labor and cost of the assembly can be reduced.

Subsequently, the operation of the screw compressor 1 will be described.
First, an operation in which the screw compressor 1 compresses gas introduced from the outside will be described.

 The motor M operates and the first rotor 3 rotates in a predetermined direction. Here, since the first timing gear 33 and the second timing gear 43 are engaged with each other, the second rotor 4 rotates in a direction opposite to the predetermined direction as the first rotor 3 rotates. Since the ratio of the number of teeth of the first timing gear 33 and the second timing gear 43 is set to 3: 5, the rotation speed ratio of the first rotor 3 and the second rotor 4 is 5: 3. Become. And since the ratio of the number of the spiral protrusions of the first rotor body 34 and the second rotor body 44 is also 5: 3, the first rotor 3 and the second rotor are not interfered with each other. 4 can rotate.

 As the first rotor 3 and the second rotor 4 rotate in directions opposite to each other, the gas introduced from the outside via a gas inlet port (not shown) passes between the first rotor 3 and the second rotor 4. It flows along the front-rear direction and is compressed. The compressed gas is discharged from the screw compressor 1 through a gas discharge port (not shown), and supplied to a device that is provided outside the screw compressor 1 and requires compressed gas. Therefore, the screw compressor 1 can be used to compress the gas introduced from the outside and supply the compressed gas to the external device.

Next, an operation in which the screw compressor 1 outputs the driving force to an external device that requires the rotational driving force will be described.
Since the rotor gear 32 and the second gear 63 are meshed with each other, the second gear 63, that is, the driven gear portion 6 is rotated when the first rotor 3 is rotated by the operation of the motor M. Since the number of teeth of the second gear 63 is set to be greater than the number of teeth of the rotor gear 32, the rotational speed of the driven gear portion 6 is lower than the rotational speed of the first rotor 3.

 Further, since the second gear 63 has a plurality of third hole portions 63b arranged at substantially equal intervals in the circumferential direction, the balance regarding the rotation of the driven gear portion 6 is well maintained, and the driven gear is also provided. Since it contributes to the weight reduction of the part 6, the efficiency regarding rotation of the screw compressor 1 can be improved.

 Next, since the first gear 62 and the output gear main body 51 are engaged with each other, the output gear main body 51, that is, the output gear portion 5 is rotated by the rotation of the first gear 62, that is, the driven gear portion 6. Since the number of teeth of the output gear main body 51 is set larger than the number of teeth of the first gear 62, the rotational speed of the output gear unit 5 is lower than the rotational speed of the driven gear unit 6.

Next, since the output gear main body 51 and the drive shaft 7 are integrally connected, the drive shaft 7 is rotated by rotation of the output gear main body 51 and is installed outside the screw compressor 1 to drive rotation. A driving force for rotation can be supplied to a device (not shown) that requires a shaft (for example, a pump). In addition, the output gear portion 5 and the driven gear portion 6 cooperate to adjust the rotational speed of the drive shaft 7 and reduce the speed.
Therefore, an appropriate rotational driving force can be supplied to a device that is installed outside the screw compressor 1 and requires a driving force at a rotational speed different from the rotational speed of the first rotor 3. There is no need to install a new drive for the device.

Here, unlike the configuration of the present embodiment, for example, it is considered that the rotational speed of the drive shaft 7 is adjusted by a configuration in which the rotor gear 32 and the output gear main body 51 are directly meshed with each other. According to such a configuration, in order to adjust and reduce the rotational speed of the drive shaft 7, it is necessary to set the diameter and the number of teeth of the output gear main body 51 larger than the diameter and the number of teeth of the rotor gear 32. As a result, the outer shape of the output gear main body 51 becomes large.
In the present embodiment, since the output gear unit 5 and the driven gear unit 6 cooperate to adjust the rotational speed of the drive shaft 7, the output gear main body 51 can be used to adjust the rotational speed of the drive shaft 7. Compared with the adjustment, the gear diameters of the output gear portion 5 and the driven gear portion 6 can be reduced. Accordingly, the width W of the portion of the gear chamber 21 shown in FIG. 1B can be reduced, and the screw compressor 1 can be reduced in size.

Therefore, according to the present embodiment, the following effects can be obtained.
According to this embodiment, in the screw compressor 1 that can output the driving force of rotation to the outside, there is an effect that the external shape can be reduced in size.

 As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

 For example, in the above embodiment, the number of the driven gear portions 6 is one, but the present invention is not limited to this, and a plurality of driven gear portions are provided, and the output gear portion 5 and the plurality of driven gear portions cooperate. By operating, the rotational speed of the drive shaft 7 may be adjusted.

 Moreover, in the said embodiment, although the rotational speed of the drive shaft 7 was adjusted and decelerated rather than the rotational speed of the 1st rotor 3, it is not limited to this, The rotational speed of the drive shaft 7 is 1st. The rotational speed of the rotor 3 may be increased.

DESCRIPTION OF SYMBOLS 1 ... Screw compressor, 2 ... Casing, 25 ... Fixed shaft, 3 ... 1st rotor (rotor, one rotor), 4 ... 2nd rotor (rotor), 5 ... Output gear part, 6 ... Driven gear part, 62 ... 1st gear, 63 ... 2nd gear, 63b ... 3rd hole (hole), 64 ... 3rd bearing (bearing part)

Claims (3)

A screw compressor comprising a pair of spiral rotors and a casing that rotatably supports the pair of rotors in mesh with each other,
An output gear unit that outputs the rotational driving force to the outside using the rotational driving force of at least one of the pair of rotors;
At least one driven gear portion that is provided between the one rotor and the output gear portion and adjusts the rotational speed of the output gear portion in cooperation with the one rotor and the output gear portion;
A fixed shaft supported by the casing,
The driven gear section is rotatably provided on the fixed shaft via a bearing section. The screw compressor according to claim 1,
The driven gear portion has a first gear and a second gear having a larger diameter than the first gear,
The first gear and the second gear are integrally connected in a posture in which each central axis is disposed on the same axis,
The screw compressor, wherein the second gear has a plurality of holes penetrating in the central axis direction. The screw compressor according to claim 2,
The screw compressor, wherein the plurality of holes are provided at substantially equal intervals in a circumferential direction of the second gear.

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