JP5504530B2 - Manufacturing method of rotary pump device - Google Patents

Description

  The present invention relates to a claw pump that includes two rotors provided with bowl-shaped claw portions and can discharge compressed gas, and a method of manufacturing the claw pump.

  As shown in the exploded view of FIG. 6, in the conventional claw pump, the two rotors 130 </ b> A and 130 </ b> B are fixed to the free ends of the rotary shafts 131 and 132 that are supported in a cantilevered support state. Further, the exhaust port 122 of the claw pump is opened to one side plate portion 120A that covers one end surface of the cylinder (cylinder peripheral wall main body portion 110). The exhaust port 122 is provided in this way because it has a compression process, and high-pressure compressed gas can be discharged from the exhaust port 122. Reference numeral 121 denotes an air inlet, which opens to the peripheral wall body 110 of the cylinder.

  A gear box is continuously provided outside the partition wall portion (the other side plate portion 120B) that closes the other end face of the peripheral wall main body portion 110 of the cylinder (on the side opposite to the peripheral wall main body portion 110 of the cylinder). A pair of gears 137 and 137 fixed to the two rotary shafts 131 and 132 are engaged with each other in the gear box (the peripheral wall portion 136 of the gear box). The two rotary shafts 131 and 132 are received by one bearing portion 135 via bearings 134 and 134 and by the other bearing portion 139 via bearings 138 and 138. As a result, the two rotors 130A and 130B rotate in opposite directions at the same speed.

  In this conventional claw pump, a structure (housing) integrally formed by a cylinder and a gear box includes one side plate portion 120A, a cylinder peripheral wall main body portion 110, the other side plate 120B, and one side plate portion. The intermediate wall portion 140 in which the bearing portion 135 is integrally molded, the peripheral wall portion 136 of the gear box, and the gear-side main body portion 150 in which the other bearing portion 139 is integrally molded have a four-part structure. .

  Further, as a prior art, a housing integrally constituted by a cylinder and a gear box includes one side plate portion, a cylinder peripheral wall main body portion, the other side plate portion, a gear box peripheral wall portion, and both. There is a pump device provided in a four-divided structure with a gear box body portion in which a bearing portion is integrally molded (see Patent Document 1).

  In the conventional claw pump as described above, the housing is divided into four parts, and each member can be processed relatively easily. However, it is difficult to increase the positioning accuracy for aligning the shaft center between the members when the pump device is assembled. Moreover, there is a problem that it is difficult to increase the production efficiency due to an increase in the number of parts.

  On the other hand, it can be considered that a housing constituted by a cylinder and a gear box is manufactured by integral molding except for one side plate portion. In this case, since it is not necessary to assemble the housing other than the one side plate portion, it is possible to increase the positional accuracy for aligning the shaft centers. However, in order to assemble the gear, it is necessary to provide an opening that must be finally closed in the peripheral wall portion of the gear box, which complicates the structure. Furthermore, since it becomes a complicated molded object, the problem that it becomes difficult to raise manufacturing efficiency is also considered.

US Pat. No. 2,635,552 (FIG. 2)

The problem to be solved with regard to the claw pump and the exhaust method is that, in the conventional claw pump, the housing integrally formed by the cylinder and the gear box is divided into four parts, which increases the alignment accuracy of the shaft center. It is difficult to increase the production efficiency. Furthermore, when the housing is integrally molded except for one side plate portion, the molded body becomes complicated, and it is difficult to increase the production efficiency.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a claw pump that can improve the alignment accuracy of the shaft center and improve the manufacturing efficiency by appropriately dividing the housing integrally formed by the cylinder and the gear box, and a manufacturing method thereof. It is to provide.

The present invention has the following configuration in order to achieve the above object.
According to one embodiment of the claw pump according to the present invention, a cylinder forming a pump chamber having a cross-sectional shape obtained by superimposing a part of two circles, and arranged in parallel in the cylinder and rotating at the same speed in opposite directions. Two rotating shafts that are integrally fixed to each of the two rotating shafts, arranged in the cylinder, and engaged with each other in a non-contact state so that the sucked gas can be compressed. Two rotors formed with a portion, a gear box provided in the cylinder in the extending direction of the rotary shaft, and fixed integrally to each of the two rotary shafts, and arranged in the gear box, And a pair of gears that rotate at the same speed in opposite directions, and the cylinder includes a peripheral wall portion of the cylinder, one side plate portion that constitutes one end wall of the cylinder, and a cylinder The other The other side plate portion which is a portion constituting the end face wall, an intake port communicating with a portion of the pump chamber where the gas in the cylinder is not compressed, and the gas in the cylinder are compressed in the one side plate portion An exhaust port provided so as to open to a portion of the pump chamber, and the gear box is provided on the opposite side of the peripheral wall portion side of the cylinder of the other side plate portion, and includes the pair of gears. A peripheral wall portion of the gear box, a portion constituting one end face wall of the gear box and one bearing portion which is a portion receiving the two rotating shafts, and a portion constituting the other end face wall of the gear box And the other bearing part which is a part for receiving the two rotation shafts, and the structure integrally formed by the cylinder and the gear box is the one of the ones An end plate wall portion on the exhaust port side and an intermediate main body by being divided between the id plate portion and the peripheral wall portion of the cylinder, and being divided between the one bearing portion and the other bearing portion. And the gear-side main body portion, and the one bearing portion, the other bearing portion, the cylinder, and the intermediate main body portion and the gear-side main body portion are aligned. As is done, the intermediate body portion and the gear-side body portion are aligned by parallel pins and connected by bolt fastening .

  Moreover, according to one form of the claw pump concerning this invention, the said inlet port can be opened and provided in the surrounding wall part of the said cylinder, It can be characterized by the above-mentioned.

Moreover, according to one form of the manufacturing method of the rotary pump apparatus concerning this invention, the cylinder which forms the pump chamber of the cross-sectional shape which overlapped a part of two circles, and it is located in parallel in this cylinder. Two rotating shafts that are arranged and rotated at the same speed in opposite directions, and are integrally fixed to each of the two rotating shafts, arranged in the cylinder, and meshed and sucked in a non-contact state with each other. and two rotors made form such gases as possible compression, the a gear box provided to the extending direction of the rotation axis, the two are integrally fixed to each rotary shaft in the gear box to the cylinder And a pair of gears that mesh with each other and rotate in the opposite direction at the same speed, and the cylinder is a side plate that is a part constituting a peripheral wall portion of the cylinder and one end face wall of the cylinder Part , And a other side plate portion is a portion which constitutes the other end wall of the cylinder, the gear box is provided to the opposite side of the peripheral wall portion side of the cylinder of the other side plate portion, the pair A peripheral wall portion of the gear box containing the gears of the gear, a bearing portion that is a portion that constitutes one end face wall of the gear box and receives the two rotation shafts, and a second end face wall of the gear box. And the other bearing part that is a part that receives the two rotating shafts, and a structure that is integrally formed by the cylinder and the gear box includes the one side plate part and the while being split between the peripheral wall of the cylinder, said by being split between one of the bearing portion and the other bearing part, and the one side plate portion, intermediate the And parts, a method of manufacturing a rotary pump apparatus comprising a structure that is a tripartite structure with the body portion of the gear-side, a state in which said the intermediate body portion and the gear side of the body portion if linked by bolting And processing the pin hole of the parallel pin for aligning the one bearing part, the other bearing part, the cylinder, and the intermediate main body part with the main body part on the gear side, and the intermediate part in the assembly process. In the connecting operation of the main body portion and the main body portion on the gear side, alignment is performed by the parallel pins.

  According to the claw pump and the manufacturing method thereof according to the present invention, by appropriately dividing the housing integrally formed by the cylinder and the gear box, the alignment accuracy of the shaft center can be improved and the manufacturing efficiency can be improved. It has a special advantageous effect.

It is a center cross-sectional view which shows the example of a form of the claw pump which concerns on this invention. It is a disassembled perspective view of the example of FIG. It is a perspective view before the temporary connection in the main-body part of the example of a form of FIG. It is a perspective view of the temporary connection state in the main-body part of the example of FIG. It is a perspective view which shows the assembly form in the main-body part of the example of a form of FIG. It is a disassembled perspective view which shows the example of a form of the conventional claw pump.

BEST MODE FOR CARRYING OUT THE INVENTION A claw pump and a manufacturing method thereof according to the present invention will be described in detail with reference to the accompanying drawings (FIGS. 1 to 4).
This claw pump can be used as a compressor or blower by connecting the exhaust side to a pneumatic device, for example, and can be used as a vacuum pump by connecting the intake side to a pneumatic device. Moreover, it is not limited to air, It can utilize also as a rotary pump apparatus which sucks and exhausts about other gas.

  Reference numeral 10 denotes a cylinder, which forms a pump chamber having a cross-sectional shape in which parts of two circles are overlapped. In the cylinder 10, two rotating shafts 21 and 22 that are rotated at the same speed in opposite directions are arranged in parallel. And it is integrally fixed to each of the free end sides held by the cantilever of the two rotating shafts 21, 22 so as to compress the gas sucked by engaging with each other in a non-contact state. Two rotors 20 </ b> A and 20 </ b> B formed with claw portions are arranged in the cylinder 10.

The cylinder 10 includes a peripheral wall portion 12 of the cylinder, one side plate portion 11 which is a portion constituting one end face wall of the cylinder 10, and the other portion which is a portion constituting the other end face wall of the cylinder 10. The side plate portion 13, the intake port 14 communicating with the portion of the pump chamber where the gas in the cylinder 10 is not compressed, and the side plate portion 11 open to the portion of the pump chamber where the gas within the cylinder 10 is compressed. And an exhaust port 15 provided at the top.
Reference numeral 36a denotes a through hole (see FIG. 3), and the other side plate portion 13 and one bearing portion 31 to be described later are provided so that the two rotary shafts 21 and 22 are inserted and received by the bearings 34 and 34. A pair opens. Each bearing 34 is attached to a bearing mounting portion provided in the bearing portion 31 by a holding plate 35.

In this embodiment, the intake port 14 is provided to be opened in the peripheral wall portion 12 of the cylinder (see FIG. 2). According to this, there is an advantage that the opening can be set sufficiently large and the connection port can be easily formed appropriately.
In addition, the opening position of the inlet 14 is not limited to this, and may be provided in one side plate part 11. That is, the position and shape of the pump chamber are not limited as long as they can communicate with the portion of the pump chamber that is the non-compression chamber.

  A gear box 30 is provided in the cylinder 10 in the extending direction of the rotary shafts 21 and 22. In the gear box 30, a pair of gears 37, 37 that are integrally fixed to the two rotating shafts 21, 22 and that mesh with each other and rotate in the opposite direction at the same speed are disposed.

Further, the gear box 30 is provided on the side opposite to the cylinder peripheral wall 12 side of the other side plate portion 13, and the gear box peripheral wall 32 containing the pair of gears 37, 37, One bearing part 31 that is a part that constitutes one end face wall and that receives the two rotary shafts 21 and 22, and a part that constitutes the other end face wall of the gear box 30 and the two rotary shafts 21 , 22 and the other bearing portion 33 that is a portion for receiving the.
In addition, 33a, 33b is a through-hole, and it opens in the other bearing part 33 so that the two rotating shafts 21 and 22 may be inserted and received by the bearings 38 and 38 (refer FIG. 3). Further, as shown in FIG. 1, oil leakage from the gear box 30 is prevented by an oil seal 36, a lid 39 and an O-ring 39a (see FIG. 2) that block the through hole 33b.

And the structure comprised integrally by the cylinder 10 and the gear box 30 is divided | segmented between the one side plate part 11 and the surrounding wall part 12 of a cylinder, and one bearing part 31 and the other bearing By being divided between the portion 33 and the end portion wall portion (one side plate portion 11) on the exhaust port side, the intermediate main body portion 40, and the gear-side main body portion 50, a three-part structure is formed. . In this embodiment, the intermediate main body portion 40 and the gear-side main body portion 50 are divided between one bearing portion 31 and the peripheral wall portion 32 of the gear box.
The position of the division is not limited to the present embodiment, and it is possible to obtain a three-divided structure by dividing the peripheral wall portion 32 of the gear box into two, and the same effect is produced. However, when divided in such a manner, the intermediate main body 40 tends to be thicker in the extending direction of the shaft than in the embodiment shown in the figure, and difficult to manufacture (mold).

Reference numeral 60 denotes a rotation drive device (see FIG. 1), which transmits power through the rotation shaft 21 and the rotation shaft 22 driven from the rotation shaft 21 via gears 37 and 37, thereby providing two rotors 20A and 20B. Are driven to rotate.
For example, a rotating shaft of an electric motor that is an example of the rotation driving device 60 can be connected to the end portion 21a of the rotating shaft 21 outside the other bearing portion 33 via a coupling (see FIG. 1). . The centrifugal fan can be fixed coaxially to the coupling to form an air cooling structure.
Of course, the rotary drive device 60 is not limited to an electric motor, and other known drive devices can be used.

  2 to 5, a plurality of bolts 52 (six in this embodiment) are arranged so as to connect the intermediate main body 40 and the main body 50 on the gear side. The bolt 52 of this embodiment is inserted into a bolt hole 51 provided in the gear-side main body 50 and screwed into a female screw portion 41 (see FIGS. 3 and 5) provided in the intermediate main body 40. Is provided.

  Reference numeral 56 denotes a pin. As shown in FIGS. 2 to 5, a plurality of pins (two in this embodiment) are arranged so as to align the intermediate main body 40 and the main body 50 on the gear side. . The pin 56 of this embodiment is inserted into a pin hole 55 (see FIGS. 2 and 4) provided in the gear-side main body 50 and a pin hole 45 (see FIG. 5) provided in the intermediate main body 40. Can be aligned.

  In the manufacturing method of the claw pump having the above configuration, in the state where the intermediate main body 40 and the gear-side main body 50 are temporarily connected by bolt fastening (see FIG. 4), one bearing 31 and the other The intermediate body portion in the assembling process is performed by performing processing on the pin holes 45 and 55 of the parallel pins 56 and 56 for aligning the bearing portion 33, the cylinder 10, and the intermediate body portion 40 with the body portion 50 on the gear side. In the connecting operation between the gear 40 and the main body 50 on the gear side, alignment can be performed by the parallel pins 56 and 56 (see FIG. 5).

As the details of the processing procedure, for example, after the processing on the gear box 30 side of the connected intermediate main body 40 and the gear-side main body 50 (hereinafter referred to as “connecting main body”) is completed, it is connected within one processing machine. The main body is inverted 180 degrees, and the cylinder inner surface on the opposite side is processed. Or you may process a connection main-body part from the both sides in the state hold | maintained at one processing machine. In either case, the connecting main body is held on the processing machine with a single chuck.
Further, the processing of the pin holes 45 and 55 into which the parallel pins 56 and 56 are inserted is simultaneously performed on the connection main body portion so as to penetrate the two parts (both main body portions 40 and 50).

According to such a processing procedure, the shafts of the mounting portions (rotating shafts 21 and 22) of the bearings 34 and 38 and the shaft of the cylinder 10 can be matched with high accuracy.
Then, after all the parts have been processed, the fastening of the connecting body part is once released, and after assembling the parts such as the assembly on the rotary shafts 21 and 22, reassembly is performed using the parallel pins 56 and 56. High coaxiality can be reproduced.
Further, according to the parallel pins 56, 56, alignment can be performed with high accuracy even in reassembly work during overhaul.

According to the claw pump and the method for manufacturing the same according to the present invention, the housing constituted integrally by the cylinder 10 and the gear box 30 is provided with one side plate portion 11, the intermediate main body portion 40, and the main body portion on the gear side. It is divided into 50 and 50. According to this, while being able to reduce the number of parts, it has the form which is easy to shape | mold, and can manufacture efficiently.
Further, in a state where the intermediate main body portion 40 and the gear-side main body portion 50 are connected, the processing of the bearing mounting portion for assembling the rotary shafts 21 and 22 and the processing of the inner surface of the cylinder 10 can be appropriately performed. . Therefore, it is possible to improve the assembling accuracy of the two rotors 20A and 20B and the pair of gears 37 and 37 that depend on the positional accuracy of the shaft centers of the rotary shafts 21 and 22.
Furthermore, according to this invention, it has the structure which can assemble efficiently by mounting | wearing so that each component may be piled up in the extension direction of an axis | shaft. Therefore, productivity of a claw pump having high performance can be improved.

  As described above, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

DESCRIPTION OF SYMBOLS 10 Cylinder 11 One side plate part 12 Cylinder peripheral wall part 13 The other side plate part 14 Intake port 15 Exhaust port 20A Rotor 20B Rotor 21 Rotating shaft 22 Rotating shaft 30 Gear box 31 One bearing part 32 Gear box peripheral wall part 33 The other bearing portion 34 Bearing 37 Gear 38 Bearing 40 Intermediate body portion 45 Pin hole 50 Gear side body portion 52 Bolt 55 Pin hole 56 Pin

Claims (2)

A cylinder forming a pump chamber having a cross-sectional shape obtained by superimposing a part of two circles, two rotating shafts arranged in parallel in the cylinder and rotated at the same speed in opposite directions, disposed in the cylinder is integrally fixed to each of the two rotation axes, and two rotor made form to allow compression of the sucked gas meshes in a non-contact state with each other, the said cylinder A pair of gearboxes provided in the extending direction of the rotating shaft and a pair of gearboxes that are integrally fixed to each of the two rotating shafts and arranged in the gearbox and mesh with each other and rotate at the same speed in opposite directions. With gears,
The cylinder comprises a circumferential wall portion of the cylinder, and one of the side plate portion which is a portion constituting one end wall of the cylinder, and the other of the side plate portion is a portion which constitutes the other end wall of the cylinder,
The gear box is provided on the side opposite to the cylinder peripheral wall side of the other side plate portion, and constitutes a peripheral wall portion of the gear box containing the pair of gears and one end face wall of the gear box. One bearing portion that is a portion and a portion that receives the two rotation shafts, and the other bearing portion that is a portion that constitutes the other end face wall of the gear box and is a portion that receives the two rotation shafts Prepared,
A structure integrally constituted by the cylinder and the gear box is divided between the one side plate portion and the peripheral wall portion of the cylinder, and the one bearing portion and the other bearing portion. A rotary pump device having a configuration in which the one side plate portion , the intermediate main body portion, and the gear-side main body portion are divided into three parts,
In a state where the intermediate body portion and the gear-side body portion are temporarily connected by bolt fastening, the one bearing portion, the other bearing portion, the cylinder, and the intermediate body portion and the gear-side body portion, Perform processing on the pin holes of the parallel pins to align
A method of manufacturing a rotary pump device , wherein in the connecting operation of the intermediate main body portion and the gear-side main body portion in an assembling step, alignment is performed by the parallel pins.   The two rotors are provided with hook-shaped claws, and the cylinder is compressed with the gas in the cylinder in the suction port that communicates with a portion of the pump chamber in which the gas in the cylinder is not compressed. 2. The method of manufacturing a rotary pump device according to claim 1, wherein a claw pump is configured by providing an exhaust port provided so as to open to a portion of the pump chamber.

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