JPH0451214Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a bellows joint installed between devices in, for example, a compressor.

[Prior Art] Conventionally, in this type of bellows joint, for example, as shown in FIG.
In the case of a structure in which the bellows 3 are connected, the spring constant and mass of the bellows 3 are calculated in advance at the design stage so that they do not match the natural frequency of the device.

The natural frequency f of such a conventional bellows joint
is calculated using the following formula: f=1/2π・√(3) Where, K: Spring constant of bellows m: Mass of bellows Spring constant K and mass m of bellows 3 When designing, there is an error between the actual value and the calculated value due to slight variations in individual molded products, and furthermore, it is difficult to adjust the natural frequency after molding. In view of these variations, the current practice is to reduce the spring constant by, for example, increasing the number of ridges in the bellows 3, thereby calculating and manufacturing the natural frequency to be on the safe side.

[Problems to be solved by the invention] However, if the variation in the spring constant K and mass m of the bellows 3 is misjudged, not only will it be impossible to deal with it, but especially when the bellows 3 is used in a direction perpendicular to the axis. There was a problem that the spring constant was easily unpredictable.

[Purpose of the invention] The present invention was made based on the above circumstances, and its purpose is to provide a bellows joint whose natural frequency can be easily adjusted in the current situation. There is a particular thing.

[Means for solving the problems] In order to solve the above problems, the present invention has the following features:
A bellows joint in which both flange parts are connected by a bellows has a structure in which a ring body of a predetermined mass is interposed in the axial center of the bellows, and another mass body is provided on this ring body for adjustment. It is something.

[Function] That is, in the present invention, with the above configuration, another mass body is added to the ring body of a predetermined mass interposed in the axial center of the bellows. If the bellows is designed and manufactured to have the minimum number of threads and mass, and another mass body is added to the ring body after manufacturing, the natural frequency can be easily adjusted without the current situation.

[Example] The present invention will be described below with reference to an example shown in FIG.

The bellows joint according to the present invention, as shown in FIG. Other mass body 1
5, which can be additionally adjusted.

Therefore, according to the configuration of the present invention described above, the natural frequency f of the bellows joint can be calculated by the following formula, so f=1/2π・√2(+23) where K: bellows Spring constant (per piece) m: Mass of bellows (per piece) M: Mass of ring body Accordingly, the bellows 13 is designed and manufactured in advance to have a spring constant K and mass m based on the minimum number of threads. After manufacturing, attach another mass body 1 to the ring body 14.
By adding 5, the natural frequency can be easily adjusted.

It should be noted that the present invention is not limited to the embodiments described above, and it goes without saying that various modifications can be made without changing the gist of the present invention.

[Effects of the invention] As is clear from the above explanation, according to the invention, a ring body having a predetermined mass is interposed in the axial center of the bellows, and another mass body is attached to this ring body so as to be freely adjustable. Since the bellows is designed to have a minimum number of threads and mass, and after manufacturing, other masses are added to the ring body, the adjustment of the natural frequency can be done as easily as before. This has an excellent effect in that it can be easily carried out at present without increasing the number of bellows at the design stage.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical side view showing an embodiment of a bellows joint according to the present invention, and FIG. 2 is a schematic vertical side view of a conventional bellows joint. 11, 12...flange part, 13...bellows, 14...ring body, 15...mass body.

Claims (1)

[Scope of utility model registration request] A bellows joint in which both flange parts are connected by a bellows, characterized in that a ring body of a predetermined mass is interposed in the axial center of the bellows, and another mass body is provided on this ring body for adjustment. bellows fitting.