Compressor

Abstract

To provide a compressor in which a compressor body and a motor, which have different weights, are arranged in a longitudinal direction on a tank and they are housed in a housing, and that can easily and efficiently prevent vibration from increasing on a lighter side of the compressor body and the motor.SOLUTION: A support plate 9 is provided with a center of gravity correction unit that corrects deviation of the center of gravity of a compressor unit 1 caused by the difference in weight between a compressor body 4 and a motor 6 by using at least one of a notch 91 and a weight 92, where a first projection center of gravity 2c obtained by projecting the center of gravity of a polygon 2b having vertices at the positions of at least three vibration control devices 21, 22, 23 onto a plane 9a along the support plate 9 is superimposed on a second projection center of gravity 1a obtained by projecting the center of gravity of the compressor unit 1 corrected by the center of gravity correction unit onto the plane 9a.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a compressor. [Background technology]

[0002] It is known that reciprocating air compressors are subject to vibrations caused by the pistons reciprocating inside the compressor body, vibrations caused by pulsations in the pressure of the compressed air being discharged, and vibrations caused by the motor that drives the pistons. These vibrations may cause fatigue failure of the members that support the compressor body and the motor, such as the air tank, base, frame, and package panel, generate noise, and cause auxiliary equipment such as a control board to malfunction.

[0003] Patent Document 1 discloses a compressor that is disposed under a tank and reduces vibration of the compressor body by using multiple vibration absorbing members (springs) attached to a frame. In this compressor, the compressor body and the motor are arranged side by side in the longitudinal direction on top of the tank, and among the multiple vibration absorbing members, the vibration absorbing members arranged at both ends in the longitudinal direction are arranged inside the longitudinal ends of the frame and outside the support parts (tank legs) that support the load of the tank. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-83179 A Summary of the Invention [Problem to be solved by the invention]

[0005] There is a compressor that aims to improve noise reduction by arranging the compressor body and the motor on the tank along the longitudinal direction of the tank and storing the compressor unit including the tank, the compressor body, and the motor in a housing. In this type of compressor, the arrangement space of each device is restricted inside the housing, so the center of gravity of the compressor unit is likely to be biased due to the weight balance between the compressor body and the motor. For example, if a compressor body that has been improved to be lighter is placed in the same position on the tank as before, the center of gravity will be closer to the motor side than before, and there is a concern that the vibration of the compressor body will increase. Therefore, in some cases, it may be necessary to significantly reconsider the device layout and vibration-proof design inside the housing.

[0006] In this regard, the technology of Patent Document 1 is not intended for application to so-called package models in which a compressor unit is housed in a housing, and for example, there is no mention of the position of the center of gravity of the compressor unit. In other words, the technology of Patent Document 1 has limitations in suppressing vibrations caused by deviations in the center of gravity of the compressor unit that can occur in package models.

[0007] The object of the present invention is to provide a compressor in which a compressor body and a motor, which are different weights, are arranged longitudinally on a tank and stored in a housing, and which can easily and efficiently suppress large vibrations in the lighter of the compressor body and the motor. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides a compressor unit comprising a compressor main body that compresses gas, a motor that operates the compressor main body via a power transmission device, a tank that stores compressed gas discharged from the compressor main body and in which the compressor main body and the motor are placed side by side in the longitudinal direction, and a support plate that supports the tank, at least three vibration isolation devices provided on the underside of the support plate to suppress vibration of the compressor unit transmitted from the support plate, and a housing that covers the compressor unit and the at least three vibration isolation devices, wherein the support plate is provided with a center of gravity correction section that corrects the bias of the center of gravity of the compressor unit due to the difference in weight between the compressor main body and the motor by at least one of a notch and a weight, and the at least three vibration isolation devices are arranged so that a first projected center of gravity obtained by projecting the center of gravity of a polygon having vertices at the positions of the at least three vibration isolation devices onto a plane along the support plate overlaps with a second projected center of gravity obtained by projecting the center of gravity of the compressor unit corrected by the center of gravity correction section onto the plane. Effect of the Invention

[0009] According to the present invention, in a compressor in which a compressor body and a motor, which are different in weight, are arranged in the longitudinal direction on a tank and stored in a housing, it is possible to easily and efficiently suppress large vibrations in the lighter one of the compressor body and the motor. Problems, configurations, and effects other than those described above will become clear from the description of the embodiments below. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a front view of a compressor according to a first embodiment of the present invention, with a part of a front panel removed to show an internal configuration. [Diagram 2] 1 is a perspective view showing a compressor unit and a base according to a first embodiment of the present invention. [Diagram 3] 1 is a front view showing a compressor unit, a vibration isolation unit, and a base according to a first embodiment of the present invention. [Figure 4] 4 is a schematic diagram showing a support plate and an anti-vibration unit as viewed from the arrows IV-IV in FIG. 3. [Diagram 5] 5 is a schematic diagram showing a support plate and an anti-vibration unit as viewed from the direction of arrows VV in FIG. 4. [Figure 6] FIG. 2 is a front view showing a compressor unit using a one-cylinder compressor body, a vibration isolation unit, and a base. [Figure 7] FIG. 11 is a front view showing a compressor unit, a vibration isolation unit, and a base according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a front view showing a compressor unit, a vibration isolation unit, and a base according to a third embodiment of the present invention. [Figure 9] FIG. 11 is a bottom view of a support plate according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The configuration and operation of compressors according to the first to third embodiments of the present invention will be described below with reference to the drawings. In each drawing, the same reference numerals indicate the same parts. In each drawing, directions are specified by mutually orthogonal XYZ axes, with +X being "right", -X being "left", +Y being "up", -Y being "down", +Z being "front", and -Z being "rear".

[0012] (First embodiment) FIG. 1 is a front view of a compressor according to a first embodiment of the present invention with a part of the front panel removed to show the internal configuration.

[0013] The compressor 100 of this embodiment is a packaged type compressor in which a compressor unit and the like are stored in a housing, and comprises a compressor unit 1, an anti-vibration unit 2 having at least three vibration-isolating devices 21, 22, 23 that suppress vibration of the compressor unit 1, and a housing 3 that covers the compressor unit 1 and the anti-vibration unit 2.

[0014] The housing 3 has a base 31, a front panel 32, a portion of which is removed in Fig. 1, a left side panel 33, a right side panel 34, a rear panel 35, and a top panel 36. A user interface 37 is provided on the front panel 32. The user interface 37 has a plurality of operation switches and a monitor.

[0015] Fig. 2 is a perspective view showing the compressor unit 1 and the base 31 according to this embodiment. Fig. 3 is a front view showing the compressor unit 1, the vibration isolation unit 2, and the base 31 according to this embodiment.

[0016] The compressor unit 1 is a device in which a compressor body 4 and a motor 6 are arranged on a tank 8, and includes the compressor body 4, the motor 6 which operates the compressor body 4 via a power transmission device 5, a mounting base 7 on which the compressor body 4 and the motor 6 are attached, the tank 8 to which the mounting base 7 is fixed at the top, and a support plate 9 which supports the tank 8.

[0017] The compressor body 4 is a device that compresses air, and for example, by reciprocating a piston, air is sucked into a cylinder from a silencer 41, compressed, and discharged to the tank 8 via a discharge pipe 42. The compressor body 4 of this embodiment is provided with two cylinders, making it a twin-cylinder unit.

[0018] The power transmission device 5 is a device that transmits the output of the motor 6 to the compressor body 4, and has, for example, a compressor body pulley 5a attached to the crankshaft of the compressor body 4, a motor pulley 5b attached to the output shaft of the motor 6, and a V-belt 5c that transmits the rotation of the motor pulley 5b to the compressor body pulley 5a. The center of gravity of the compressor unit 1 is biased toward the power transmission device 5 side (-Z side) in the short side direction (Z axis direction) of the tank 8 because the power transmission device 5 is provided only on one side in the short side direction (Z axis direction) of the tank 8.

[0019] The motor 6 is, for example, an inductance motor, and is connected to a power source AC via an electromagnetic switch. When the output shaft of the motor 6 rotates, the crankshaft of the compressor body 4 rotates via the power transmission device 5, causing the piston to reciprocate.

[0020] The mounting base 7 is a metal base to which the compressor body 4 and the motor 6 are attached by, for example, bolts, and is fixed to the upper part of the tank 8 by, for example, welding.

[0021] The tank 8 is a cylindrical container that contains the air compressed by the compressor body 4, and is disposed horizontally so that its side faces the lower surface of the mounting stand 7 and the upper surface of the base 31. At the bottom of the tank 8, two angle members (leg members) 81, 82 are fixed onto a support plate 9 so as to face each other with a gap in between in the longitudinal direction of the tank 8, thereby supporting the tank 8.

[0022] The two angle members 81, 82 are metal members having an L-shaped cross section, and each have a vertical plate portion 81a, 82a that supports the tank 8, and a horizontal plate portion 81b, 82b that is placed on and fixed to the support plate 9.

[0023] The vertical plate portion 81a of the angle member 81 stands upright so as to overlap the center of gravity 6a of the motor 6 when the compressor unit 1 is viewed in a plan view from above. In addition, the vertical plate portion 82a of the angle member 82 stands upright so as to overlap the center of gravity 4a of the compressor body 4 when the compressor unit 1 is viewed in a plan view from above.

[0024] The horizontal plate portions 81b, 82b of the angle members 81, 82 are arranged so as to be positioned outside the vertical plate portions 81a, 82a in the longitudinal direction (X-axis direction) of the tank 8, and are fixed to the upper surface of the support plate 9 with bolts and nuts.

[0025] Fig. 4 is a schematic diagram showing the support plate 9 and the vibration isolation unit 2 as viewed from the direction of arrows IV-IV in Fig. 3. Fig. 5 is a schematic diagram showing the support plate 9 and the vibration isolation unit 2 as viewed from the direction of arrows VV in Fig. 4.

[0026] The support plate 9 is a flat metal plate, and is provided with a center of gravity correction portion that corrects the imbalance of the center of gravity of the compressor unit 1 using at least one of a notch 91 and a weight 92 (in this embodiment, both the notch 91 and the weight 92).

[0027] The notch 91 is a portion cut out of the support plate 9 in order to correct the center of gravity of the compressor unit 1 which is biased toward the heavier side of the compressor body 4 or the motor 6. In this embodiment, the compressor body 4 is lighter than the motor 6, and the notch 91 is provided on the motor 6 side (-X side) of the support plate 9.

[0028] Moreover, the notch 91 is preferably a concave opening provided at one of ends 93, 94 of the support plate 9 in the longitudinal direction (X-axis direction) of the tank 8, which is the heavier end of the compressor body 4 or the motor 6. In this embodiment, since the motor 6 is heavier than the compressor body 4, the notch 91 is open at the end 93 on the motor 6 side, and has a concave shape towards the compressor body 4 side (+X side) in the longitudinal direction (X-axis direction) of the tank 8.

[0029] The weight 92 is a portion for increasing the weight of the support plate 9 on the lighter side in order to correct the center of gravity of the compressor unit 1 which is biased toward the heavier side of the compressor body 4 or the motor 6. In this embodiment, the compressor body 4 is lighter than the motor 6, and the weight 92 is provided on the compressor body 4 side (+X side) of the support plate 9.

[0030] In addition, when the weight 92 is the end located on the lighter side of the compressor body 4 and the motor 6, of the two ends 83, 84 (see Figure 3) in the longitudinal direction (X-axis direction) of the tank 8, which is the first end (in this embodiment, the end 84 on the compressor body 4 side), it is preferable that the weight 92 be a protrusion 92a (shaded area in Figure 4) formed by protruding the end 94 of the support plate 9 in the longitudinal direction (X-axis direction) of the tank 8 outward beyond the first end 84 of the tank 8 when the compressor unit 1 is viewed in a plan view from above.

[0031] The length of the protruding portion 92a in the longitudinal direction (X-axis direction) of the tank 8 is limited by the right side panel 34 (see FIG. 1). Therefore, a bent portion 92b, for example, bent downward (to the -Y side), may be further provided at an end 94 of the protruding portion 92a. By providing the bent portion 92b at the end 94 of the protruding portion 92a, it is possible to increase the weight that is insufficient with the protruding portion 92a alone, and further increase the moment of inertia of the support plate 9 in the longitudinal direction (X-axis direction) of the tank 8, thereby making it possible to increase the inertial force required for vibration reduction.

[0032] 6 is a front view showing the compressor unit 1 using a one-cylinder compressor body, the vibration isolation unit 2, and the base 31. When the compressor body 4 has one cylinder, the length of the protruding portion 92a in the longitudinal direction (X-axis direction) of the tank 8 is further limited. For this reason, it is preferable that the compressor unit 1 using the one-cylinder compressor body is provided with a bent portion 92b.

[0033] Moreover, the power transmission device 5 is provided on the output shaft side (-Z side) of the motor 6 mounted on a mounting base 7 fixed to the upper part of the tank 8. Since the power transmission device 5 is located on one side (-Z direction) of the short sides (Z axis direction) of the tank 8, the center of gravity on the support plate 9 is biased to one side (-Z direction) of the short sides (Z axis direction) of the tank 8. Therefore, it is preferable that the support plate 9 of this embodiment extends to the other side (+Z direction) of the short sides (Z axis direction) of the tank 8, and the position of the center of gravity of the support plate 9 is biased to the other side (+Z direction) of the short sides (Z axis direction) of the tank 8.

[0034] As shown in FIG. 4, the support plate 9 has at least three mounting holes 95 (three in this embodiment) for mounting the vibration-isolating unit 2, a plurality of bolt holes 96 (four in this embodiment) for attaching bolts for fixing the angle members 81, and a plurality of U-shaped cutout portions 97 (two in this embodiment) for fixing the compressor unit 1 to the base 31 during transportation.

[0035] It is preferable that stud bolts 2a protruding toward the support plate 9 side of the at least three vibration isolators 21, 22, 23 are inserted into the at least three mounting holes 95 from the underside of the support plate 9. It is preferable that nuts are fastened to the stud bolts 2a (see FIG. 5) protruding from the upper surface of the support plate 9, and each of the at least three vibration isolators 21, 22, 23 is fixed to the support plate 9. In this way, each of the at least three vibration isolators 21, 22, 23 is fixed to a predetermined position on the underside of the support plate 9.

[0036] The bolt holes 96 are provided at positions overlapping with bolt holes provided in the horizontal plate portions 81b, 82b of the angle members 81, 82 placed on the upper surface of the support plate 9. It is preferable that a bolt inserted into each of the bolt holes 96 from the lower surface side of the support plate 9 passes through the bolt holes provided in the horizontal plate portions 81b, 82b, protrudes to the upper surfaces of the horizontal plate portions 81b, 82b, and is fastened by a nut. In this way, the angle members 81, 82 are fixed to the upper surface of the support plate 9.

[0037] The vibration isolation unit 2 includes at least three vibration isolation devices 21 , 22 , 23 that are provided on the lower surface of the support plate 9 and that suppress vibrations of the compressor unit 1 transmitted from the support plate 9 .

[0038] At least three vibration isolators 21, 22, 23 are preferably made of cylindrical vibration isolating rubber, but are not limited thereto and may be made of a polymer having a columnar shape, a spring (a helical spring), or the like.

[0039] In addition, the at least three vibration-damping devices 21, 22, 23 are arranged so that a first projected center of gravity 2c obtained by projecting the center of gravity of a polygon (in this embodiment, a triangle 2b whose vertices are the positions of the vibration-damping devices 21, 22, 23) onto a plane 9a along the support plate 9 overlaps with a second projected center of gravity 1a obtained by projecting the center of gravity of the compressor unit 1 corrected by the center of gravity correction section (notch 91 and weight 92) onto the plane 9a along the support plate 9.

[0040] Furthermore, the motor 6 is located on one side (-X side) of the tank 8 in the longitudinal direction (X-axis direction) of the tank 8. The compressor body 4 is located on the tank 8 on the other side (+X side) of the tank 8 in the longitudinal direction (X-axis direction). The power transmission device 5 is located on the tank 8 on one side (-Z side) of the tank 8 in the lateral direction (Z-axis direction).

[0041] Moreover, the at least three vibration isolators 21, 22, and 23 are preferably a first vibration isolator 21, a second vibration isolator 22, and a third vibration isolator 23.

[0042] When the compressor unit 1 is viewed in a planar view from above, it is preferable that the first vibration isolation device 21 and the second vibration isolation device 22 are located on one side (-Z side) of the short side direction (Z axis direction) of the tank 8 relative to the second projected center of gravity 1a, and the third vibration isolation device 23 is located on the other side (+Z side) of the short side direction (Z axis direction) of the tank 8 relative to the second projected center of gravity 1a.

[0043] Furthermore, when the compressor unit 1 is viewed in a plan view from above, it is preferable that the first vibration isolation device 21 is located on the other side (+X side) of the tank's longitudinal direction (X-axis direction) relative to the center of gravity 4a of the compressor body 4, and the second vibration isolation device 22 is located on one side (-Z side) of the tank 8's longitudinal direction (Z-axis direction) relative to the center of gravity 6a of the motor 6.

[0044] Moreover, at least three vibration isolation devices 21, 22, 23 are preferably provided with studs 2d (see FIG. 5) that protrude towards the base 31. The base 31 is preferably provided with bolt holes for inserting the studs 2d. The vibration isolation unit 2 is fixed to the upper surface of the base 31 by inserting the studs 2d into the bolt holes from the upper surface of the base 31 and tightening nuts on the studs 2d protruding from the lower surface of the base 31.

[0045] Moreover, the base 31 is preferably placed on the ground via a pad made of, for example, rubber.

[0046] [effect] The compressor 100 of this embodiment includes a compressor unit 1 having a compressor body 4 that compresses gas, a motor 6 that operates the compressor body 4 via a power transmission device 5, a tank 8 that stores compressed gas discharged from the compressor body 4 and in which the compressor body 4 and the motor 6 are placed side by side in the longitudinal direction, and a support plate 9 that supports the tank 8, at least three vibration isolators 21, 22, and 23 that are provided on the lower surface of the support plate 9 and suppress vibration of the compressor unit 1 transmitted from the support plate 9, and a vibration isolator that covers the compressor unit 1 and the at least three vibration isolators 21, 22, and 23. The compressor unit 1 has a housing 3, and the support plate 9 is provided with a center of gravity correction section that corrects the bias of the center of gravity of the compressor unit 1 due to the difference in weight between the compressor body 4 and the motor 6 by at least one of a notch 91 and a weight 92, and the at least three vibration-damping devices 21, 22, 23 are arranged so that a first projected center of gravity 2c obtained by projecting the center of gravity of a polygon 2b having vertices at the positions of the at least three vibration-damping devices 21, 22, 23 onto a plane 9a along the support plate 9 overlaps with a second projected center of gravity 1a obtained by projecting the center of gravity of the compressor unit 1 corrected by the center of gravity correction section onto the plane 9a.

[0047] Therefore, in the compressor 100 of this embodiment, a center of gravity correction section is provided in the support plate 9 to correct the deviation of the center of gravity 1a of the compressor unit 1 by at least one of the notch 91 and the weight 92, so that the deviation of the position of the center of gravity 1a of the compressor unit 1 due to the difference in weight between the compressor body 4 and the motor 6 can be easily suppressed.

[0048] Furthermore, the at least three vibration isolation devices 21, 22, 23 of this embodiment are arranged such that a first projected center of gravity 2c obtained by projecting the center of gravity of a polygon 2b having vertices at the positions of the at least three vibration isolation devices 21, 22, 23 onto a plane 9a along the support plate 9 overlaps with a second projected center of gravity 1a obtained by projecting the center of gravity of the compressor unit 1 corrected by the center of gravity correction section onto the plane 9a. Therefore, the balance performance of the compressor unit 1 can be improved, and vibration of the compressor unit 1 can be efficiently suppressed.

[0049] Therefore, according to this embodiment, in the compressor 100 in which the compressor body 4 and the motor 6, which are of different weights, are arranged side by side longitudinally on the tank 8 and stored in the housing 3, it is possible to easily and efficiently suppress large vibrations in the lighter of the compressor body 4 and the motor 6.

[0050] Moreover, the compressor 100 of this embodiment includes a notch 91 provided on the support plate 9 on the motor 6 side, and a weight 92 provided on the support plate 9 on the compressor body 4 side. This makes it possible to easily and efficiently suppress large vibrations on the compressor body 4 side, even if the compressor body 4 is made lighter than the motor 6.

[0051] Further, the notch 91 is a concave opening provided at the end 93 of the support plate 9 on the heavier side of the compressor body 4 and the motor 6, among the ends 93, 94 of the support plate 9 in the longitudinal direction (X-axis direction) of the tank 8. This makes it possible to suppress a decrease in the moment of inertia of the support plate 9 in the lateral direction (Z-axis direction) of the tank 8 while suppressing a deviation in the position of the center of gravity of the compressor unit 1 in the lateral direction (Z-axis direction) of the tank 8. Furthermore, it is possible to easily reduce the weight of the heavier side of the compressor body 4 and the motor 6, and to suppress a deviation in the position of the center of gravity of the compressor unit 1 in the longitudinal direction (X-axis direction) of the tank 8.

[0052] In addition, when the end (end 84 in this embodiment) of the weight 92 located on the lighter side of the compressor body 4 and motor 6 out of the two ends 83, 84 in the longitudinal direction (X-axis direction) of the tank 8 is defined as the first end, the weight 92 is a protrusion 92a formed by protruding the end (end 94 in this embodiment) of the support plate 9 outward from the first end 84 of the tank 8 when the compressor unit 1 is viewed in a plan view from above.

[0053] This makes it easy to increase the weight of the lighter of the compressor body 4 and the motor 6, making it easy to correct the center of gravity position of the compressor unit 1, and also increases the moment of inertia of the support plate 9 of the lighter of the compressor body 4 and the motor 6 in the longitudinal direction (X-axis direction) of the tank 8, thereby increasing the inertial force required to reduce vibration.

[0054] Moreover, it is preferable that the weight 92 further includes a bent portion 92b formed by bending the tip of the protruding portion 92a. The length of the protruding portion 92a in the longitudinal direction (X-axis direction) of the tank 8 is limited by the right side panel 34 (see FIG. 1). However, by providing the bent portion 92b at the end 94 of the protruding portion 92a, the weight of the lighter one of the compressor body 4 and the motor 6 can be easily increased, and the position of the center of gravity of the compressor unit 1 can be easily corrected, and the moment of inertia of the support plate 9 on the lighter one of the compressor body 4 and the motor 6 in the longitudinal direction (X-axis direction) of the tank 8 can be increased, and the inertial force required for vibration reduction can be increased.

[0055] In addition, in the compressor 100 of this embodiment, the power transmission device 5 is located on one side (-Z side) of the short side direction (Z axis direction) of the tank 8 on the tank 8, the support plate 9 extends to the other side (+Z side) of the short side direction (Z axis direction) of the tank 8, and the position of the center of gravity of the support plate 9 is biased to the other side (+Z side) of the short side direction (Z axis direction) of the tank 8.

[0056] This makes it possible for the power transmission device 5 to easily correct the center of gravity of the compressor unit 1, which has been biased to one side (-Z side) in the short direction (Z-axis direction) of the tank 8, and to prevent vibrations from becoming too large on the other side (+Z side) of the short direction (Z-axis direction) of the tank 8.

[0057] Moreover, in the compressor 100 of this embodiment, it is preferable that the at least three vibration isolators 21, 22, 23 are the first vibration isolator 21, the second vibration isolator 22, and the third vibration isolator 23. This makes it possible to reduce the number of parts and efficiently suppress the transmission of vibration from the compressor unit 1 to the base 31. The reasons for this are as follows.

[0058] In order to suppress the transmission of vibrations from the compressor unit 1 to the base 31, it is necessary to reduce the vibration transmissibility, which is the ratio of the vibration (force or amplitude) from the machine (compressor unit 1), which is the vibration source, to the vibration (force or amplitude) transmitted to the base (base 31).

[0059] There are three methods for reducing the vibration transmission rate: increasing the rotational speed of the compressor body 4 or the motor 6; lowering the spring constant of each vibration isolation device 21, 22, 23; and increasing the mass attached to each vibration isolation device 21, 22, 23.

[0060] The method of increasing the rotation speed of the compressor body 4 or the motor 6 is a method of increasing the vibration frequency of the compressor unit 1 and decreasing the vibration transmission rate by increasing the rotation speed of the compressor body 4 or the motor 6. However, since the rotation speed of the motor 6 depends on the power supply frequency, and the diameter of the compressor body pulley 5a cannot be reduced in order to suppress the output of the motor 6, it is difficult to adopt the method of changing the rotation speed of the compressor body 4 or the motor 6.

[0061] Furthermore, the method of lowering the spring constant of each of the vibration isolation devices 21, 22, 23 cannot be adopted because this would reduce the hardness of each of the vibration isolation devices 21, 22, 23 and therefore the load that the vibration isolation unit 2 can support would decrease.

[0062] On the other hand, in this embodiment, the vibration isolation unit 2 is composed of three vibration isolation devices 21, 22, and 23, which is the minimum number of vibration isolation devices required to support the compressor unit 1 on a flat surface, and the mass on each vibration isolation device 21, 22, and 23 increases, thereby reducing the vibration transmissibility, and the transmission of vibrations from the compressor unit 1 to the base 31 can be efficiently suppressed.

[0063] In addition, in the compressor 100 of this embodiment, the motor pulley 5b of the power transmission device 5, which is located on one side (-Z direction) of the short side direction (Z axis direction) of the tank 8, and the compressor main body pulley 5a rotate when the motor 6 is started, so that vibration occurs more on one side (-Z direction) of the short side direction (Z axis direction) of the tank 8 than on the other side (+Z direction) of the short side direction (Z axis direction) of the tank 8. However, in the compressor 100 of this embodiment, the first vibration isolator 21 and the second vibration isolator 22 are located on one side (-Z side) of the tank 8 (Z axis direction) from the second projection center of gravity 1a, and the third vibration isolator 23 is located on the other side (+Z side) of the short side direction (Z axis direction) of the tank 8 from the second projection center of gravity 1a, so that vibration occurring on one side (-Z direction) of the short side direction (Z axis direction) of the tank 8 can be suppressed more than on the other side (+Z direction) of the short side direction (Z axis direction) of the tank 8.

[0064] It is also preferable that the first vibration isolator 21 is located on the other side (+X side) of the center of gravity 4a of the compressor body 4 in the longitudinal direction (X-axis direction) of the tank, and the second vibration isolator 22 is located on one side (-Z side) of the longitudinal direction (Z-axis direction) of the tank 8 in the longitudinal direction (X-axis direction) of the motor 6. This makes it possible to suppress the compressor unit 1 from tilting and vibrating toward either the compressor body 4 side or the motor 6 side in the longitudinal direction (X-axis direction) of the tank 8.

[0065] Second embodiment 7 is a front view showing a compressor unit 201 according to a second embodiment of the present invention, an anti-vibration unit 2, and a base 31. The compressor unit 201 according to this embodiment differs from the compressor unit 1 according to the first embodiment in that the compressor unit 201 further includes a weight 92c having a weight 92 fixed to a protruding portion 92a.

[0066] The weight 92c may be, for example, a metal block or a device such as an oil cooler.

[0067] [effect] In the compressor unit 201 of this embodiment, the weight 92 further includes a weight 92c fixed to the protruding portion 92a. This allows the weight of the lighter one of the compressor body 4 and the motor 6 to be easily increased, and the center of gravity of the compressor unit 1 to be easily corrected, while increasing the moment of inertia of the support plate 9 of the lighter one of the compressor body 4 and the motor 6 in the longitudinal direction (X-axis direction) of the tank 8, and increasing the inertial force required for vibration reduction.

[0068] Third embodiment Fig. 8 is a front view showing a compressor unit 301, an anti-vibration unit 2, and a base 31 according to a third embodiment of the present invention. Fig. 9 is a bottom view of a support plate 309 according to the third embodiment of the present invention.

[0069] The compressor unit 301 according to this embodiment differs from the compressor unit 1 according to the first embodiment in that the compressor body 4 is heavier than the motor 6, a notch 391 is provided on the compressor body 4 side of the support plate 309, and a weight 392 is provided on the motor 6 side of the support plate 309.

[0070] Specifically, in this embodiment, since the compressor body 4 is heavier than the motor 6, the notch 391 has an open end 94 on the compressor body 4 side and is recessed toward the motor 6 (-X side) in the longitudinal direction (X-axis direction) of the tank 8.

[0071] Moreover, the weight 392 is preferably a protruding portion 392a (shaded portion in FIG. 9) formed by protruding the end 93 of the support plate 309 outward beyond the first end 83 of the tank 8 when the compressor unit 301 is viewed from above in a plan view. Moreover, a bent portion 392b bent, for example, downward (to the -Y side) may be further provided at the end 93 of the protruding portion 392a.

[0072] [effect] In the compressor unit 301 of this embodiment, the compressor body 4 is heavier than the motor 6, and a notch 391 is provided on the support plate 309 on the compressor body 4 side, and a weight 392 is provided on the support plate 309 on the motor 6 side.

[0073] As a result, even if the motor 6 is made lighter than the compressor body 4, the vibrations on the motor 6 side can be easily and efficiently prevented from becoming large.

[0074] The present invention is not limited to the above-described embodiment, and includes various modified examples. For example, the above-described embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to those including all of the configurations described. In addition, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0075] 1,201,301...Compressor unit, 1a...Second projected center of gravity, 2...Vibration isolation unit, 2b...Polygon (triangle), 2c...First projected center of gravity, 3...Housing, 4...Compressor body, 4a...Center of gravity of compressor body, 5...Power transmission device, 6...Motor, 6a...Center of gravity of motor, 7...Mounting base, 8...Tank, 9,309...Support plate, 9a...Plane, 21,22,23...Vibration isolation device, 31...Base, 81,82...Angle member (foot member), 83,84...End of tank, 92a,392a...Protruding portion, 92b,392b...Bent portion, 92c...Heavy weight, 93,94...End of support plate, 100...Compressor

Claims

1. a compressor unit including a compressor body that compresses gas, a motor that operates the compressor body via a power transmission device, a tank that stores compressed gas discharged from the compressor body and in which the compressor body and the motor are placed side by side in the longitudinal direction, and a support plate that supports the tank; at least three vibration isolation devices provided on a lower surface of the support plate to suppress vibration of the compressor unit transmitted from the support plate; a housing that covers the compressor unit and the at least three vibration isolation devices, a center-of-gravity correction portion is provided on the support plate, the center-of-gravity correction portion correcting a deviation in the center of gravity of the compressor unit caused by a difference in weight between the compressor body and the motor by at least one of a notch and a weight; A compressor characterized in that the at least three vibration-damping devices are arranged so that a first projected center of gravity, obtained by projecting the center of gravity of a polygon having vertices at the positions of the at least three vibration-damping devices onto a plane along the support plate, overlaps with a second projected center of gravity, obtained by projecting the center of gravity of the compressor unit corrected by the center of gravity correction unit onto the plane.

2. 2. The compressor according to claim 1, A compressor characterized in that, when the compressor body is lighter than the motor, the center of gravity correction unit comprises a notch provided on the motor side of the support plate and a weight provided on the compressor body side of the support plate.

3. 2. The compressor according to claim 1, A compressor characterized in that, when the compressor body is heavier than the motor, the center of gravity correction unit comprises a weight provided on the motor side of the support plate and a notch provided on the compressor body side of the support plate.

4. 2. The compressor according to claim 1, a notch formed as a concave opening at an end of the support plate in the longitudinal direction of the tank, the end being on the heavier side of the compressor body and the motor;

5. 2. The compressor according to claim 1, a compressor characterized in that the weight is a protrusion formed by protruding an end of the support plate in the longitudinal direction of the tank outward beyond the first end of the tank when the compressor unit is viewed in a plan view from above, where the first end is the end of the tank that is lighter between the compressor body and the motor, out of the two longitudinal ends of the tank.

6. The compressor according to claim 5, The compressor, wherein the weight further includes a bent portion formed by bending a tip of the protrusion.

7. The compressor according to claim 5, The compressor, wherein the weight further comprises a weight fixed to the protrusion.

8. 2. The compressor according to claim 1, the power transmission device is located on one side of the tank in a shorter side direction, The support plate extends in the other short-side direction of the tank, A compressor characterized in that the position of the center of gravity of the support plate is biased to the other side in the short direction of the tank.

9. 2. The compressor according to claim 1, the motor is located on one side of the tank in a longitudinal direction of the tank, the compressor body is located on the other side of the tank in a longitudinal direction, the power transmission device is located on one side of the tank in a short side direction of the tank, The at least three vibration isolation devices are a first vibration isolation device, a second vibration isolation device, and a third vibration isolation device; When the compressor unit is viewed in a plan view from above, the first vibration isolating device and the second vibration isolating device are located on one side of the second projected center of gravity in a short side direction of the tank, and the third vibration isolating device is located on the other side of the second projected center of gravity in the short side direction of the tank, A compressor characterized in that, when the compressor unit is viewed in a planar view from above, the first vibration isolation device is located on the other side of the longitudinal direction of the tank relative to the center of gravity of the compressor body, and the second vibration isolation device is located on one side of the longitudinal direction of the tank relative to the center of gravity of the motor.

Images