JP2018179192A - Coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling which can alleviate noise and power generation, and an energy loss caused by a windage loss without causing the complication of a structure, and without the necessity of complicated attachment/detachment work.SOLUTION: A coupling for joining shaft parts 1, 3 to each other at their shaft ends, and inducing the synchronous rotation of the shaft part 1, 3 comprises: a shaft part main body 5a having an axial core L along axial cores 1a, 3a of the shaft parts 1, 3; joint parts 5b, 5c which are arranged at shaft ends of the shaft part main body 5a, and can connect the shaft parts 1, 3 to each other; and a casing 5d which surrounds the shaft part main body 5a together with the joint parts 5b, 5c, and partitions and forms a sealed space M at its inside. The casing 5d has at least one opening 7 for making the sealed space M and the outside communicate with each other, and the shaft part main body 5a has an exhaust fan 6 which rotates in conjunction with the rotation of the shaft part main body 5a, and discharges air in the casing 5d to the outside via the opening 7 by the rotation.SELECTED DRAWING: Figure 1

Description

  In the present invention, the shaft portion (output shaft) of a drive source such as a motor and the shaft portion (input shaft) of a rotating device such as a compressor, a reduction gear, or a generator are mutually connected to each other. The present invention relates to a coupling suitable for use such as transmitting an input shaft of the rotary device to rotationally drive the rotary device.

  Normally, a coupling having a function of absorbing an attachment error of the shaft portion is used for connection between the shaft portions. By the way, such a coupling rotates with each shaft, and generation of noise due to friction with air (especially wind noise at the mounting bolt, etc.), heat generation, and energy loss due to wind loss can not be avoided. Have.

  As a prior art which eliminated such a defect, for example, in patent document 1, a coupling cover and a coupling cover formed in an annular shape so as to cover the coupling bolt and the coupling nut on a projecting portion of the coupling nut Is disclosed.

Japanese Utility Model Application Publication No. 61-155601

  However, the technique disclosed in Patent Document 1 requires a process of forming a through hole in a coupling bolt and forming an internal thread for screwing a set screw at both ends, complicating the structure, and Since the increase in cost is inevitable and the installation and removal of the cover involves the troublesome work of attaching or removing the set screw one by one, efficient attachment of the cover, There is a problem in the place where it can not be removed.

  An object of the present invention is to propose a coupling that can reduce energy loss due to noise, heat generation, and wind loss without requiring complicated operations or complicated attachment and removal operations.

  The present invention is a coupling that connects the respective shafts together at their shaft ends to induce synchronous rotation of the respective shafts, and has a shaft main body having a shaft center along the shaft center of the respective shafts. And a joint portion respectively provided at an axial end of the axial portion main body and enabling connection with each axial portion, and a casing which surrounds the axial main body together with the joint portion and defines an enclosed space inside thereof And the casing has at least one opening for communicating the sealed space with the outside, and the shaft body rotates in synchronization with the rotation of the shaft body, and the rotation causes the casing to rotate. It is a coupling characterized by having an exhaust fan which exhausts inside air outside through the opening.

  In the coupling having the above configuration, it is preferable that the casing has a check valve that opens the opening only when the air in the sealed space is discharged to the outside.

  Further, the exhaust fan includes a fan main body fixedly held by the shaft portion main body, and a partition surrounding the fan main body in the sealed space, and the partition is configured to take in air in the sealed space into the partition. It is possible to apply one having one suction port and at least one exhaust port for delivering the air drawn into the partition towards the port.

  Preferably, one of the shafts is an output shaft of a drive source, and the other is an input shaft of a rotating device.

  According to the present invention, the air in the enclosed space is discharged to the outside through the opening by the rotation of the exhaust fan, and the pressure in the enclosed space is reduced, thereby reducing the friction between the air and the coupling, and noise Energy loss due to heat generation and wind loss is reduced.

  Further, according to the present invention, since the exhaust fan is attached to the coupling and only the part thereof is covered by the casing, the structure is relatively simple, and the coupling can be attached and removed easily.

FIG. 2 schematically shows an embodiment of a coupling according to the present invention. It is the figure which showed the front and back of the exhaust fan shown in FIG. FIG. 7 schematically shows another embodiment of the coupling according to the present invention. It is the figure which showed typically the front of the coupling shown in FIG. 3 in the cross section.

Hereinafter, the present invention will be more specifically described with reference to the drawings.
FIG. 1 is a view schematically showing an embodiment of a coupling according to the present invention.

  In the figure, reference numeral 1 denotes a shaft portion such as an output shaft of a drive source, 2 a flange provided at an end of the shaft portion 1, 3 a shaft portion such as an input shaft of a rotating device, and 4 a shaft portion The flange 5 provided at the shaft end is a coupling that connects the shaft 1 and the shaft 3 to each other and induces synchronous rotation of the respective shafts 1 and 3.

  The coupling 5 is provided at the shaft end of the shaft portion main body 5a having a shaft core L along the shaft core 1a of the shaft portion 1 and the shaft core 3a of the shaft portion 3, and at the shaft end of the shaft portion main body 5a. Joints (flanges) 5b and 5c enabling connection with the shaft 1 and the shaft 3 via the shaft, the shaft body 5a and the joints 5b and 5c as the shaft end of the shaft 1 (including the flange 2) , And a casing 5d surrounding the axial end (including the flange 4) of the shaft portion 3 and defining an enclosed space M inside thereof. The flange 2, the flange 4 and the joint portions 5b and 5c are detachably fastened by fastening means B such as bolts. As casing 5d, although the box-shaped thing comprised from structural steel materials etc. can be used, for example, it does not specifically limit about the material and shape. In addition, although the thing of the type connected with a flange as an example as a coupling 5 was shown as an example in this example, the coupling 5 can apply all the couplings generally known.

  Further, reference numeral 6 denotes an exhaust fan which is provided in the shaft portion main body 5a and rotates in a rotating manner, and 7 is an opening which is provided in the casing 5d and which makes the sealed space M communicate with the outside. At least one opening 7 may be provided.

  As shown in FIG. 2, the exhaust fan 6 may be, for example, a double-sided suction type centrifugal type having a plurality of impellers 6b on the outer surface of the disk 6a as shown in FIG. The gas can be sucked from the outer periphery of the disc 6a while being sucked along the axial center L of the main part 5a. The exhaust fan 6 may be of another type as long as it can efficiently exhaust the air in the sealed space M.

  Moreover, 8 is a non-return valve provided in the outer surface of casing 5d. The check valve 8 is for closing the opening 7 but opens the opening 7 with the discharge pressure only when the air in the closed space M is discharged to the outside, and the air in the closed space M is After the exhaust gas is exhausted, the opening 7 is closed by the check valve 8 and has a function of maintaining the inside of the sealed space M in a reduced pressure state.

  The casing 5d is basically fixed to a mount or the like (not shown), and the seal member 9 is disposed in the opening 5d1 for passing the shaft 1 and the opening 5d2 for passing the shaft 3.

  When the exhaust fan 6 rotates in synchronization with the rotation of the shaft portions 1 and 3, the air in the enclosed space M is exhausted to the outside through the opening 7. And, as a result of the pressure in the enclosed space M being reduced, the friction between the coupling 5 and the air is reduced, and noise such as wind noise, heat generation or wind loss is reduced.

  FIG. 3 is a view schematically showing another embodiment of the coupling according to the present invention. In this example, the exhaust fan 6 includes a fan main body including a disk 6a and an impeller 6b, and a partition (same member as the casing 5d, etc.) 6c that surrounds the fan main body in the sealed space M to form a vortex chamber. It is constructed.

  In the coupling having such a configuration, a suction port 6c1 for taking the air in the sealed space M into the partition 6c and an exhaust port 6c2 for sending out the air taken in the partition 6c toward the opening 7 are provided. Thus, as shown in FIG. 4, the air in the enclosed space M can be efficiently exhausted through the opening 7.

  According to the present invention, it is possible to provide a coupling that can reduce energy loss due to noise, heat generation and wind loss without requiring complicated operations or complicated attachment and removal operations.

Reference Signs List 1 shaft portion 1a shaft core 2 flange 3 shaft portion 3a shaft core 4 flange 5 coupling 5a shaft portion main body 5b, 5c joint portion 5d casing 6 exhaust fan 6a disk 6b impeller 6c partition wall 7 opening 8 check valve 9 sealing member M sealing Space L shaft core B fastening means

Claims (4)

A coupling that connects the shafts together at their shaft ends and induces synchronous rotation of the shafts,
A shaft body having a shaft core extending along the shaft center of each shaft, a joint portion provided at each shaft end of the shaft body and enabling connection with each shaft, and the shaft body And a casing that encloses with the joint portion and defines an enclosed space inside thereof.
The casing has at least one opening communicating the sealed space with the outside,
The shaft body includes an exhaust fan which rotates in synchronization with the rotation of the shaft body and exhausts the air in the casing to the outside through the opening by the rotation.   The coupling according to claim 1, wherein the casing has a check valve that opens the opening only when the air in the enclosed space is discharged to the outside. The exhaust fan comprises a fan main body fixedly held by the shaft portion main body, and a partition surrounding the fan main body in the sealed space;
The partition has at least one suction port for taking the air in the enclosed space into the partition and at least one exhaust port for sending the air drawn in the partition toward the opening. Coupling according to claim 1 or 2.   The coupling according to any one of claims 1 to 3, wherein one of the shafts is an output shaft of a drive source, and the other is an input shaft of a rotating device.

Images