JPH04318292A - Reciprocating compressor - Google Patents

Abstract

PURPOSE:To effectively damp and absorb abnormal vibration, generated at the time of stopping a reciprocating compressor. CONSTITUTION:Two shock absorbers 11, 11 are provided positioned on a diagonal on a base 4 between each base seat 3 and this base 4, and each shock absorber 11 is constituted tilt mounted about 45 deg. toward the inside in an axial direction so as to obtain a result direction of vertical and axial directions. Accordingly, in the case of generating abnormal vibration by a coil spring 5 or the like passing through a resonance point at the time of stopping a reciprocating compressor, each shock absorber 11 absorbs the vibration while damping vibrations in vertical and axial directions by telescopically moving a piston rod of each shock absorber 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor suitable for compressing fluid such as air.

0002

2. Description of the Related Art FIGS. 7 to 9 show a package type reciprocating air compressor as a conventional reciprocating compressor.

In the figure, 1 indicates a soundproof case, 2 indicates an air tank provided on a pedestal 1A of the soundproof case 1,
The air tank 2 has four legs 2A, 2 provided on the lower side.
Mounting frame 1 of soundproof case 1 via A,... (only two are shown)
It is fixed at A. The air tank 2 temporarily stores compressed air discharged from a compressor main body 6, which will be described later.

[0004] Reference numerals 3 and 3 indicate two pedestals provided at both ends of the upper part of the air tank 2 so as to straddle the air tank 2;
Each pedestal 3 is formed of a flat upper plate part 3A provided across the radial direction of the air tank 2, extending downward from both ends of the upper plate part 3A, and fixed to the outer peripheral surface of the air tank 2. Side plate parts 3B, 3B (only one is shown) and the upper plate part 3
It consists of a U-shaped lower angle 3C that opens upward and is fixed to the upper end surface of A by fixing means such as welding.

Reference numeral 4 indicates a base provided above each pedestal 3, and the base 4 includes a flat plate portion 4A on which the compressor main body 6 and the like are mounted, and a base extending downward from both widthwise ends of the flat plate portion 4A. vertical plate parts 4B, 4B (only one shown),
It consists of a U-shaped upper angle 4C located below the flat plate part 4A, extending in the width direction through each of the vertical plate parts 4B, and opening downward.

5, 5, ... are located between each upper angle 4C of the base 4 and each lower angle 3C of each pedestal 3,
Coil springs (only two are shown) are shown as support springs provided at the four corners of the base 4, and each of the coil springs 5 is composed of disk-shaped spring receivers 5A, 5A, . . . as shown in FIG.
(only two are shown). and,
Each coil spring 5 biases the base 4 upward with its spring force, thereby moving the base 4 etc. to each pedestal 3.
The vibration of the base 4 is absorbed while supporting the base 4 on the top.

Reference numeral 6 indicates a reciprocating compressor body mounted on the flat plate portion 4A of the base 4, and the compressor body 6 accommodates a crankshaft (not shown) connected to an electric motor 7, which will be described later. a crankcase 6A, and three cylinders 6B, 6 provided on the crankcase 6A and each having a built-in piston.
B,..., filters 6C, 6C,... connected to the suction chamber of each cylinder 6B, and a discharge pipe 6D connecting the discharge chamber (none of which is shown) of each cylinder 6B to the air tank 2.
It is composed of. The compressor main body 6 is driven by an electric motor 7, so that each filter 6
The air sucked in through C is compressed by a piston in each cylinder 6B, and this compressed air is discharged into the air tank 2 through a discharge pipe 6D.

Reference numeral 7 indicates an electric motor as a drive source mounted on the flat plate portion 4A of the base 4 together with the compressor main body 6;
The electric motor 7 drives a compressor via pulleys 8, 9 and a V-belt 10.

A reciprocating compressor according to the prior art has the above-described configuration, and when the electric motor 7 rotates due to power supply, this rotation is transmitted to the compressor body 6 via the V-belt 10 and the like. As a result, the compressor main body 6 compresses the air sucked into each cylinder 6B through each filter 6C with a piston, and discharges this compressed air into the air tank 2 through the discharge pipe 6D. It is designed to be temporarily stored.

When the pressure inside the air tank 2 reaches the set pressure due to the compressed air discharged from the compressor main body 6, an unload valve (not shown) attached to the compressor main body 6 opens, and the air is supplied to the air tank 2. The inflow of compressed air is cut off, the compressed air in each cylinder 6B is released into the outside air from the unload valve, and the power supply to the electric motor 7 is cut off. As a result, the compressor main body 6 and the electric motor 7, which are in the unloaded state, are driven by inertia and then stop naturally.

[0011] Further, vibrations generated during operation of the compressor main body 6 are absorbed by four coil springs 5, 5, . . . that support the base 4 on each pedestal 3.

0012

By the way, in the prior art described above, since each coil spring 5 is provided, small vibrations occurring during operation can be absorbed by each coil spring 5. However, although each coil spring 5 has a shock absorbing force, its damping force against vibration is small, so when the compressor main body 6 is stopped in a loaded state, the compressed air remaining in each cylinder 6B causes the compressor main body 6, etc. suddenly stops, and the reaction from this sudden stop causes extremely large vibrations in the upward, downward, and axial directions.

Furthermore, when the pressure in the air tank 2 reaches the set pressure and the power supply to the electric motor 7 is stopped in the unloaded state with the unload valve open, the compressor main body 6 generates small vibrations and is caused by inertia. After rotating the crankshaft, etc., it comes to a natural stop. In this case, the vibration immediately after the power supply is stopped is relatively small, but when this vibration gradually decreases and passes the resonance point in the support structure of each coil spring 5, it becomes very large as shown in FIG. It causes a big vibration.

Here, as a result of measuring the vibration according to the conventional technology, the amplitude D of this vibration is 9.3 mm, and the vibration time T is 12 mm.
．． It was 8 seconds.

Therefore, in the prior art, extremely large vibrations are generated for a long time when the reciprocating compressor is stopped, regardless of the loading or unloading state, and this vibration causes damage to the welded parts. Problems such as cracks occurring and damage at places where stress is concentrated, such as the compressor body 6 falling over, and the spring force of the coil spring 5 decreasing, significantly reducing reliability and service life. There is.

The present invention has been made in view of the problems of the prior art described above, and an object of the present invention is to provide a reciprocating compressor that can effectively damp and absorb vibrations generated when the compressor is stopped.

[0017]

[Means for Solving the Problems] A feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that a buffer is provided between the pedestal and the base to damp the vibration of the base on the pedestal. It is installed.

[0018] Furthermore, it is preferable that a plurality of the buffers be provided between the pedestal and the base, each inclined in a different direction.

[0019]

[Operation] With the above configuration, when vibration occurs in the base when the compressor main body is stopped, the shock absorber installed between the base and each pedestal expands and contracts to generate a damping force, damping this vibration and Absorb.

[0020] Furthermore, by providing a plurality of the shock absorbers tilted in different directions, vibrations generated in the upward, downward, axial and width directions can be attenuated and absorbed by each of the shock absorbers.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 1 to 6. In the embodiment, the same components as those in the prior art shown in FIGS. 7 to 9 described above are given the same reference numerals, and the explanation thereof will be omitted.

First, FIGS. 1 and 2 show a first embodiment of the present invention.

In the figure, reference numerals 11 and 11 indicate each pedestal 3 and the base 4.
shows two buffers provided between the buffers 1 and
1 includes a cylinder 12 having a mounting portion 12A integrally formed on the upper end side, and
It is generally composed of a piston rod 13 that enters the cylinder 12 and is connected to a piston (not shown), and whose lower end side protrudes outside the cylinder 12, and a fastening portion 13A is formed at the lower end side of the piston rod 13. . Each shock absorber 11 is disposed at a diagonal position of the base 4 as shown in FIG. By attaching the mounting portion 12A of the cylinder 12 to the vertical plate portion 4B of the base 4 via the mounting plate 15, the cylinder 12 is tilted at an angle of approximately 45 degrees toward the inside in the axial direction so as to be in the direction of the resultant force of the upper, lower, and axial directions. It is installed at an angle.

The reciprocating air compressor according to this embodiment has the configuration described above, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment, two shock absorbers 11, 11 are provided diagonally on the base 4 between each pedestal 3 and the base 4, and each shock absorber 11 is placed on the inside in the axial direction. Approximately 4
Since it is installed at an angle of 5 degrees, the axial vibrations and upward and downward vibrations generated on the base 4 can be damped by the expansion and contraction of the piston rod 13 of each shock absorber 11, thereby preventing abnormalities caused by sudden stops from the loaded state. Even if vibration occurs, each shock absorber 1
1 can quickly damp and absorb this vibration together with each coil spring 5.

[0026] Furthermore, even if the gradually decreasing vibration passes through the resonance point of each coil spring 5 and abnormal vibration occurs when stopping from the unloaded state, this vibration can be reliably damped and absorbed.

In this embodiment, the results of measuring the damping state of abnormal vibrations generated by each shock absorber 11 when the operation is stopped from the unloaded state are as follows.

First, as a result of measuring the damping state of the abnormal vibration at point A in FIG. 3 (position near the shock absorber 11), as shown in FIG. 4, the amplitude D1 was 5.4 mm, and the vibration time T1 was 6.4 mm.
It was 8 seconds. Furthermore, as a result of similar vibration measurement at point B in FIG. 3 (a position away from the shock absorber 11), the amplitude D2 was 5.7 mm and the vibration time T was as shown in FIG.
2 was 6.8 seconds.

Therefore, according to this embodiment, each buffer 11
By installing this, it is possible to effectively damp vibrations at the time of stop regardless of the distance from each shock absorber 11, and as shown in FIG. Compared to the damped state, the amplitudes D1 and D2
In addition, both the vibration times T1 and T2 can be reduced by approximately half, and it is possible to prevent stress from vibration from concentrating and damaging welded parts, etc., and also to reliably prevent the compressor main body 6, etc. from falling over. The reliability and life of the reciprocating air compressor can be greatly improved.

Next, FIG. 6 shows a second embodiment of the present invention, and the feature of this embodiment is that the shock absorber is installed tilted in the direction of the resultant force of the three axes: upward, downward, axial, and width directions. That's true.

In the figure, reference numerals 21 and 21 indicate buffers according to this embodiment, which are disposed diagonally on the base 4, and each buffer 21 is similar to each buffer 11 according to the first embodiment described above.
Almost similarly, a cylinder 22 has a mounting portion 22A integrally formed on the upper end side, the upper end enters into the cylinder 22 and is connected to a piston (not shown), and the lower end protrudes outside the cylinder 22, The piston rod 23 is formed with a fastening portion 23A. However, in this embodiment, each shock absorber 21 is attached to the mounting portion 22A of the cylinder 22.
is the mounting member 24 provided on the vertical plate portion 4B of the base 4.
The fastening portion 23A of the piston rod 23 is rotatably fastened to the mounting base 25 provided on the side plate portion 3B of the pedestal 3, so that the resultant force in the upward, downward, and axial directions is directed. It is provided so as to be inclined inwardly in the axial direction at an angle of about 45 degrees, and also inwardly in the width direction at an angle of about 45 degrees.

[0032]Thus, this embodiment configured in this way can also obtain almost the same effects as the first embodiment, but in particular, in this embodiment, each buffer 21 is Since the structure is such that it is tilted in the direction of the resultant force in the three axes of direction, axis, and width, vibrations generated in these three axes can be effectively damped, further improving reliability. Can be done.

[0033] In the above embodiment, each buffer 11, 2
Although it has been described that two shock absorbers 11 and 2 are provided diagonally on the base 4, the present invention is not limited to this.
1 may be provided at each of the four corners of the base 4, or in some cases, one, three, or five or more may be provided.

Further, in the above embodiment, the coil spring 5 is used as the support spring disposed between the lower angle 3C of each pedestal 3 and the upper angle 4C of the base 4, but instead For example, other spring members such as a leaf spring may be used as the support spring.

Furthermore, in the first embodiment, each buffer 1
1 is positioned on the diagonal line of the base 4 and tilted approximately 45 degrees inward in the axial direction so that the resultant force in the upper, lower and axial directions is directed.
In the second embodiment, each shock absorber 21 is positioned on a diagonal of the base 4 and tilted in the direction of the resultant force in the three axes of the upper, lower, axial, and width directions. However, the present invention is not limited to this, and the mounting position, mounting angle, etc. of each shock absorber 11, 21 may be adjusted as appropriate depending on the weight of the compressor main body 6 etc. mounted on the base 4 and the vibration generation state. It is.

Furthermore, in each of the above embodiments, a package-type reciprocating air compressor was used as an example of the reciprocating compressor, but the present invention is not limited to this, and industrial gases such as nitrogen gas, It can also be widely applied to compressors for refrigerants such as fluorocarbon gas.

[0037]

Effects of the Invention As detailed above, according to the present invention, since a shock absorber is installed between the pedestal and the base to damp the vibrations of the base on the pedestal, the vibrations generated on the base can be reduced. The shock absorber can quickly damp and absorb abnormal vibrations that occur when the compressor body stops. As a result, strong vibrations can be reliably prevented from being applied to the base etc., stress can be prevented from acting on the welded parts etc. and they can be damaged, and the reliability and life of the reciprocating compressor can be improved.

Furthermore, since a plurality of shock absorbers are provided between the pedestal and the base, each inclined in different directions, it is possible to attenuate and absorb vibrations occurring in different directions, thereby improving the damping effect.

[Brief explanation of drawings]

FIG. 1 is a front view showing a reciprocating air compressor according to a first embodiment of the present invention.

FIG. 2 is a front view showing an enlarged main part in FIG. 1;

FIG. 3 is a plan view of the compressor shown in FIG. 1, with the compressor main body etc. removed, as seen from the direction of arrows III-III.

FIG. 4 is a characteristic diagram showing the damping state of vibrations that occur when stopping from the unloading state at point A in FIG. 3;

5 is a characteristic diagram showing the damping state of vibrations that occur when the vehicle stops from the unloaded state at point B in FIG. 3; FIG.

FIG. 6 is an enlarged external perspective view showing the attached state of the shock absorber according to the second embodiment of the present invention.

FIG. 7 is a front view of a reciprocating air compressor according to the prior art.

FIG. 8 is a front view showing an enlarged main part in FIG. 7;

FIG. 9 is a characteristic diagram showing a damping state of vibrations generated when the reciprocating compressor stops from an unloaded state.

[Explanation of symbols]

3 Pedestal 4 Base 5 Coil spring (support spring) 6 Compressor body 7 Electric motor (drive source) 11, 21 Buffer

Claims (2)

[Claims] 1. A pedestal, a base attached to the pedestal via a plurality of support springs, and a reciprocating motion provided on the base together with a drive source and compressing fluid by being driven by the drive source. A reciprocating compressor comprising a type compressor main body, wherein a shock absorber is installed between the pedestal and the base to damp vibrations of the base on the pedestal. . 2. The reciprocating compressor according to claim 1, wherein a plurality of said shock absorbers are provided between a pedestal and a base, each inclined in a different direction.