JPH04143492A - Oil cooling type screw compressor - Google Patents

Abstract

PURPOSE:To reduce the occupation space of a device concerned and suppress noise by locating a compressor body between a discharge port and a follower pulley, and holding the body with an intermediate member in the condition that the body is fixed to a placing table and the discharge port is pressed to a flow-in port. CONSTITUTION:The body 1 of a compressor is secured to a suction casing 7 as an intermediate member. This compressor body 1 is supported in the form of cantilever by fixing the suction casing 7 onto a placing table 22, and is put in tight contact with an opening 23 through an 0-ring 24 while pressed by a flow-in port 23 in the condition that the discharge port 8 is isolated from the outside. Because an oil tank 10 and a reserve tank 12 are formed from one vessel, the whole device can be designed compactly, and the compressor body 1 is supported by the placing table 22 through the suction casing 7 so that 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 the 0-ring 24, and thereby the noise is reduced.

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 is 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).

(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, but simply stacking the compressor Since the main body itself is a source of vibration, there is a problem in that vibrations propagate to the oil tank and generate large noise.

The present invention has been made to address these conventional problems, and is intended 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, the present invention provides an inlet that penetrates the center of the upper surface of an oil tank that stores oil separated from discharged gas, and an outer peripheral portion of the upper surface of the oil tank. a compressor body equipped with an oil tank equipped with a mounting table located at the oil tank, a discharge port that is in close contact with the inlet through a sealing means, and a driven booby that receives upward force and is attached to the shaft end of the screw rotor. and an intermediate member located between the discharge port and the driven booby, fixed to the mounting table, and holding the compressor main body in a state where the discharge port is pressed against the inflow port. did.

(Function) By forming the compressor as described above, vibrations from the compressor body are absorbed into the periphery of the oil tank, which is almost a rigid body, rather than at the center of the top surface of the oil tank, where vibrations are likely to be amplified, resulting in low noise. Become.

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

FIG. 1 shows an oil-cooled screw compressor according to the present invention, and shows a compressor main body 1. A suction filter 5° and an intake control valve 6. The suction casing 7 is connected to an oil tank lO, an aftercooler 11. A reserve tank 12 is provided, and an oil filter 14 and a three-way switching valve 15 are provided in the lubricating oil circulation channel 13. It is formed by providing an oil cooler 16.

The compressor body 1 includes a suction casing 7, which is an example of an intermediate member.
A pair of male and female screw rotors 1 that are fixed to the screw rotor 1 and are rotatably supported by a discharge side bearing (not shown) inside and a suction side bearing inside the suction casing 7 and mesh with each other.
7 and drive pulley! 8. Driven pulley 19. It can be driven by a motor 2 via a belt 20. In addition, an intake control valve 6 is installed in the intake casing 7.
A suction filter 5 is fixed to the suction filter 5, and a suction flow path 4 is formed by a communication space inside each of the suction filters 5.

The oil tank 10 and the reserve tank I2 are formed into one container via a partition plate 21 having an arch-shaped cross section and having an upwardly convex surface below the oil tank 10. In addition, a mounting table 22 is erected around the oil tank 10, an inlet 23 is formed passing through the center of the upper surface of the oil tank IO, and the suction casing 7 is fixed on the mounting table 22 to compress the air. Machine body I
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 10 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, from this oil separation element 26 to the aftercooler 11 via the pressure holding check valve 27. A discharge flow path 9 that continues to the reserve tank 12 is formed. 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 suction casing 7
, 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 flow path 13 is located in the oil reservoir section 2 at the bottom of the oil tank lO.
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.

The motor 2 drives the pulley 18. When the screw rotor 17 is rotationally driven via 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 is sucked in from the suction port 3.
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 an aftercooler 1, 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 passes through the oil filter 14 and the three-way switching valve 15 and reaches the oil cooler 16, where it is cooled by air from a fan (not shown), similar to the compressed air in the aftercooler 1. Compressor body 1. After being sent to the above-mentioned oil supply point in the suction casing 7, it is collected in the oil reservoir 29 and thereafter used for circulation as described above. Note that 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 passed through the oil filter by switching the flow path of the three-way switching valve 15. 14, the oil cooler 16 is bypassed and the oil can be sent directly to the above-mentioned oil supply location.

Here, since the oil tank 10 and the reserve tank 12 are formed as one container, the entire device is 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 2 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 oil level rises, and the oil level and the oil separation element 26 You cannot get too close to it, and you need to keep it a certain distance away. 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 IO other than the oil separation section 25 is reduced to provide 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 horizontal 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 upper center of the oil tank IO, 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 1, which easily generates vibrations and becomes a source of noise, is supported by the mounting table 22 via the suction casing 7 so that it 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 tends to be a source of noise generation along with the compressor main body l, is connected to the oil separating section 25 and the support plate 28 through the support plate 28. Intake control valve6. Supported by a mounting table 22 via a suction casing 7, an oil tank 10 similar to the above 7 is installed.
The purpose is to reduce noise by allowing vibrations to propagate to the surrounding area.

Preferably, the oil tank 10 is formed of a thick walled material, and in this case, as shown in FIG. It is also possible to lower the height and make effective use of the space on the sides of the oil separation section 25.

In the above embodiment, the discharge port 8 and the inlet port 23 are located above and below the O-ring 24, but as shown in FIG. The inlet 23 may also be positioned so that the outlet 8 is pressed toward the inlet 23 in a vertically slidable state.

Further, although the above embodiments have been shown in which the compressed gas is air, 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 explanation, according to the present invention, an inlet that penetrates the center of the upper surface of the oil tank for storing oil separated from discharged gas, and an outer peripheral portion of the upper surface of the oil tank are provided. a compressor main body comprising an oil tank provided with a mounting table, a discharge port in close contact with the inlet via a sealing means, and a driven pulley that receives an upward force and is attached to the shaft end of a screw rotor; and an intermediate member located between the discharge port and the driven pulley, fixed to the mounting table, and holding the compressor main body in a state where the discharge port is pressed against the inflow port. .

Therefore, not only can the entire device be made compact, but also noise can be reduced because the compressor body, which is the source of vibration, is supported near the upper surface of the oil tank, which is closest to the rigid body. In addition, the compressor body is fixed to an intermediate member placed between the compressor body and a driven pulley that receives upward force.
Because it is supported in a cantilevered state, even if the fixing means for the intermediate member to the mounting table should become loose, the discharge port will not move toward the oil tank and separate from the inlet port, ensuring the safety of the equipment. It also has the effect of improving sex.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an oil-fed screw compressor according to the present invention, and FIG. 2 is a partially enlarged sectional view showing only the discharge port portion of an oil-fed screw compressor according to another embodiment of the present invention. be. l... Compressor body, 7... Suction casing, end...
Discharge port, IO...Oil tank, 23...Inflow port, 24
...0 ring. Agent for patent applicant Kobe Steel, Ltd.

Claims (1)

[Claims] (1) An oil tank provided with an inlet passing through the center of the upper surface of the oil tank for storing oil separated from the discharged gas, and a mounting table located on the outer periphery of the upper surface of the oil tank; The compressor body is equipped with a discharge port that is in close contact with the inflow port, and a driven pulley attached to the shaft end of the screw rotor that receives upward force. An oil-cooled screw compressor, characterized in that it is formed by providing an intermediate member that is fixed and holds the compressor main body in a state in which the discharge port is pressed against the inflow port.