JPH04143493A - Oil cooling type screw compressor - Google Patents

Abstract

PURPOSE:To suppress the occupation space of a device concerned and reduce the noise by locating the body of compressor over an oil tank, which is interposed in a discharge path in connection with the discharge port for the purpose of storing the oil separated from the discharge gas, fixing an intermediate member onto the periphery of the tank. and thereon fixing a drive part. CONSTITUTION:The body 1 of a compressor is secired to a suction casing 7, and the oversurface of a suction regulator valve 6 is located at the same level as the oversurface of a frame 40 erected at the oversurface periphery of an oil tank 10, and a motor 2 is fixed onto the two oversurfaces through a supporting plate 28. The compressor body 1 is supported by a placing table 22 through the suction casing 7, and vibration is received by the periphery of the oil tank 10, while the oversurface middle part of the oil tank 10 is put in contact with the compressor body 1 through an 0-ring 24, and thereby noise is reduced. A motor 2 is supported by the free 40 through the supporting plate 28 and also by the placing table 22 through the suction regulator valve 6, etc., and vibration is conducted to the periphery of the oil tank 10, and noise reduction is achieved. The oil tank 10 and reserve tank 12 are formed from one vessel, and the whole device is configured compactly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an oil-cooled screw compressor having a structure in which a compressor main body and its driving section are stacked on an oil tank.

(Conventional technology) Conventionally, screw compressors have been used in many fields.
Various improvements continue. In addition to improving performance, these improvements have also been made in terms of, for example, reducing the space occupied by the device and reducing noise. Among these, when trying to reduce the space occupied by the equipment, it may be possible to change the arrangement structure in which the various devices that make up the equipment are stacked, which was previously arranged on a flat surface.For example, by placing the compressor main body on top of the oil tank. There is a known example (Utility Model Publication No. 54-37444).

Utility Model Publication No. 52-54009). From the same idea,
Furthermore, it is conceivable to arrange the motor, which is the driving part, on the compressor main body.

(Problems to be Solved by the Invention) As mentioned above, it is possible to reduce the space occupied by the device by arranging the compressor main body on top of the oil tank and the motor above it, but it is possible to reduce the space occupied by the device. If only this is done, there is a possibility that a dead space will be created, and since the compressor body itself is a source of vibration, there is a problem in that the vibrations propagate to the oil tank and generate large noise.

The present invention has been made to address these conventional problems, and aims to provide an oil-cooled screw compressor that can reduce the space occupied by the device and reduce noise.

(Means for Solving the Problems) In order to solve the above problems, a first invention provides a method for providing a compressor body with oil separated from discharged gas by interposing the compressor body in a discharge passage connected to a discharge port of the compressor body. In an oil-cooled screw compressor, the compressor body and the drive unit are disposed above an oil tank that stores oil and a drive unit is disposed above the compressor body, and the compressor body and the drive unit are formed so as to be supported around the top surface of the oil tank. did.

Further, in a second aspect of the invention, an oil separation element for separating oil from discharged gas is provided in a support portion protruding above the peripheral portion of the oil tank, and the drive portion is fixed on the support portion.

Furthermore, in a third invention, an intermediate member for holding the compressor main body is fixed on the peripheral part of the oil tank, and the driving part is fixed on the intermediate member.

(Effect) No. 1 above. Second. By forming the device as in the third invention, not only the entire device becomes compact, but also noise is reduced.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a screw compressor according to a first invention, in which a compressor main body 1. A suction filter 5. Intake control valve6. A suction casing 7 is provided, and an oil tank 10° aftercooler II and a reserve tank 12 are provided in the discharge passage 9 following the discharge port 8 of the compressor body 1, and an oil filter 14 and a three-way switching valve are provided in the lubricating oil circulation passage 13. 15. It is formed by providing an oil cooler I6.

The compressor main body l is fixed to the suction casing 7, and houses therein a pair of female and male screw rotors 17 that are rotatably supported by a discharge side bearing (not shown) and a suction side bearing inside the suction casing 7 and mesh with each other. The motor 2 is connected to the motor 2 via the drive pulley 1B, the driven pulley 19, and the belt 20.
It can be driven by In addition, the suction casing 7
An intake control valve 6 is fixed to the intake control valve 6, and a suction filter 5 is fixed to the intake control valve 6, and a suction flow path 4 is formed by a communication space inside each.

The oil tank 10 and the reserve tank 12 are formed into one container with a partition plate 21 having an upwardly convex surface and an arch-shaped cross section disposed below the oil tank 10. In addition, by erecting a mounting table 22 around the oil tank IO, forming an inlet 23 that passes through the center of the upper surface of the oil tank 10, and fixing the suction casing 7 on the mounting table 22, Compressor body 1
is supported in a cantilevered state, and the O-ring 2 is inserted into the opening 23.
The discharge port 8 is pressed against the inlet port 23 to be in close contact with the inlet port 23 in a state where the discharge port 8 is blocked from the outside through the inlet port 4. Further, an oil separation part 25 is provided upright above the peripheral part of the oil tank IO on the opposite side from the above-mentioned mounting stand 22, and an oil separation element 26 is provided in the upper part of the space within this oil separation part 25, and an oil separation element 26 is provided at the discharge port. 8, a discharge flow path 9 is formed which continues from the oil separation element 26 to the aftercooler If and the reserve tank 12 via the pressure holding check valve 27. In addition, in the figure, the discharge flow path 9 is partially omitted, and the * marks communicate with each other.

The upper surface of the oil separation section 25 is formed to have a predetermined height with respect to the upper surface of the mounting table 22, and
, the intake regulating valve 6 is also formed to have a predetermined height, and the suction casing 7 and the intake regulating valve 6 are placed on the mounting table 22.
The upper surface of the intake control valve 6 and the upper surface of the oil separation part 25 are made to be at the same height by simply stacking and fixing them.
is fixed.

The lubricating oil circulation passage 13 is connected to the oil reservoir 2 at the bottom of the oil tank 10.
Exit 9 and go to the compressor main body 1. bearing in the suction casing 7,
It has reached oil supply points such as shaft seals.

Next, the operating state of the device having the above configuration will be explained.

When the screw rotor 17 is rotationally driven by the motor 2 via the drive pulley 1B, the driven pulley 19, and the belt 20, the air sucked in by the screw rotor 17 via the suction filter 5 passes through the suction channel 4 and reaches the suction port 3. Inhale more,
It is compressed and discharged to the discharge port 8 together with the lubricating oil supplied to the bearings and the like. The compressed air discharged together with this lubricating oil enters the oil tank 10 in the discharge flow path 9, is separated into gas and liquid by the oil separation element 26, and the lubricating oil is dripped and temporarily stored in the oil reservoir 29. The oil-separated compressed air reaches the aftercooler 11, where it is cooled by air blowing from a fan (not shown), is temporarily stored in a reserve tank 12, and then is sent out of the machine as required.

On the other hand, the lubricating oil in the oil reservoir 29 is an oil filter! The oil reaches the oil cooler 16 via the 4° three-way switching valve 15, where it is cooled by air from a fan (not shown), similar to the compressed air in the aftercooler II, and then cooled by air from a fan (not shown). After being sent to the above-mentioned oil supply point in the suction casing 7, the oil sump 29
The waste is recovered and thereafter used for circulation in the same manner as above. In addition,
If the lubricating oil in the oil reservoir 29 does not need to pass through the oil cooler 16, such as when the lubricating oil is at a temperature that does not require cooling, the lubricating oil can be transferred from the oil filter 14 by switching the flow path of the three-way switching valve 15. The oil cooler I6 is bypassed and the oil is directly sent to the oil supply point.

Here, since the oil tank 10 and the reserve tank 12 are formed as one container, the entire device can be made compact, and the lubricating oil in the oil reservoir 29 is stored in a partition plate with an arched cross section to improve pressure resistance. It is adjacent to the cooled compressed air in the reserve tank 12 via 21, so that the lubricating oil is also cooled by this cooled air.

Further, for example, when the compressor is started, bubbles are generated in the lubricating oil in the oil reservoir 29, and the oil level rises.

On the other hand, in order to maintain the gas-liquid separation performance of the oil separation element 26, it is necessary to prevent the oil separation element 26 from soaking in lubricating oil even when the curved surface is raised, and the oil level and the oil separation element 26 must be You cannot get too close to it, and you need to set it a certain distance in advance. For this reason, conventional oil tanks have a large height and are bulky as a whole, whereas in this embodiment, an oil separator is installed above the periphery on one side of the oil tank 10. By providing the oil separation element 26 above the space within the section 25, a sufficiently large distance from the oil surface of the oil reservoir section 29 can be ensured, and the other space can be used effectively. That is, the height of the portion of the oil tank 10 other than the oil separation section 25 is reduced to the minimum necessary volume to store the lubricating oil necessary to continue circulating the lubricating oil within the device. This point can be solved by arranging the compressor main body 1 in the space created by lowering the height and positioning the compressor main body 1 between the protruding parts of the oil separation part 25, the suction casing 7, and the intake air control valve 6. This also makes the entire device compact.

In addition, the partition plate 21 has an arch-shaped cross section, and the cross section of the oil reservoir 29 expands upward, so that when the oil level attempts to rise due to the generation of air bubbles, deaeration is promoted. This contributes to suppressing the rise in the oil level and reducing the height of the oil tank 10.

Furthermore, since the oil tank IO has a shape with a small height and a large horizontal cross section, except for the oil separation part 25, it easily bends when vibration is applied to the center of the upper surface of the oil tank 10, similar to a drum. However, even if the peripheral portion receives vibration, it is difficult to generate sound because the peripheral portion is closer to a rigid body than the central portion. Therefore, in this embodiment, the compressor main body l, which easily generates vibrations and becomes a source of noise, is supported by the mounting table 22 via the suction casing 7 so that the oil tank 10 receives vibrations around the oil tank 10. The center part of the upper surface of the compressor main body 1 is connected to the
The noise is reduced by making it come into contact with the

In addition, the motor 2, which is likely to be a source of noise along with the compressor main body 1, is connected to the oil separation section 25 and the support plate 28 via the support plate 28. Intake control valve6. The oil tank 10 is supported by the mounting table 22 via the suction casing 7, and as described above, vibrations are propagated to the surrounding area of the oil tank 10, thereby reducing noise.

In the above embodiment, the motor 2, which is a driving part, is connected to the oil separation part 25 and the suction cane 7 through the support plate 28. Although the intake control valve 6 is shown to support the valve, the present invention is not limited to this, and the above-mentioned support parts can also be connected to the oil tank IO.
It may also be supported by a pedestal erected around the periphery.

Also preferably an oil tank! 0 is preferably made of thick-walled material. In this case, as shown in FIG. It is also possible to effectively utilize the space on the sides of the section 25.

FIG. 2 shows an oil-cooled screw compressor according to a second invention, which is different from the device shown in FIG. Except for the fact that the suction casing gate is replaced by a pedestal 39 erected around the upper surface of the oil tank IO, the other parts are substantially the same, and corresponding parts are given the same numbers and a description thereof will be omitted.

FIG. 3 shows an oil-cooled screw compressor according to a third invention, which is different from the device shown in FIG. Except for the fact that the stand 40 was installed, the rest is substantially the same,
The same numbers are given to mutually corresponding parts, and the explanation is omitted.

In addition, the above 1. Second. In each of the third embodiments, air is used as the compressed gas, but the present invention is not limited to this, but also includes devices that use gases other than air as the compressed gas.

(Effects of the Invention) As is clear from the above description, according to the first invention, the oil separated from the discharged gas is collected by interposing the compressor body in the discharge passage connected to the discharge port of the compressor body. In an oil-cooled screw compressor that is disposed above an oil tank for storing oil and a drive section is disposed above a compressor body, the compressor body and the drive section are formed so as to be supported around the upper surface of the oil tank. It is.

According to the second aspect of the invention, an oil separation element for separating oil from discharged gas is provided in a support portion protruding above the peripheral portion of the oil tank, and the drive portion is fixed on the support portion. It is.

Furthermore, according to the third invention, an intermediate member for holding the compressor main body is fixed on the peripheral part of the oil tank, and the driving part is fixed on the intermediate member.

Therefore, not only can the entire device be made compact, but also noise can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an oil-fed screw compressor according to the first invention, FIG. 2 is an overall configuration diagram of an oil-fed screw compressor according to the second invention, and FIG. 3 is an oil-fed screw compressor according to the third invention. FIG. 1 is an overall configuration diagram of a refrigerated screw compressor. ■...Compressor body, 2...Motor, 6...Intake control valve, 7...Suction casing, 10...Oil tank,
25... Oil separation section, 26... Oil separation element, 3
9.40... mount. Patent applicant: Agent of Kobe Steel, Ltd.
Patent attorney Aohaku Ao and 1 other person s1 figure 2

Claims (3)

[Claims] (1) The compressor body is placed above the oil tank that stores oil separated from the discharged gas, interposed in the discharge passage connected to the discharge port of the compressor body, and the drive unit is placed above the compressor body. 1. An oil-cooled screw compressor, characterized in that the compressor main body and the drive section are supported around an upper surface of an oil tank. (2) Claim (2) characterized in that an oil separation element for separating oil from the discharged gas is provided in a support portion protruding above the peripheral portion of the oil tank, and the drive portion is fixed on the support portion. The oil-cooled screw compressor described in 1). (3) An oil cooling system according to claim (1), characterized in that an intermediate member for holding the compressor body is fixed on a peripheral portion of the oil tank, and the driving section is fixed on this intermediate member. type screw compressor.