Package-type air compressor

Abstract

This package-type air compressor comprises: an intake port that takes in air from the outside; a machine chamber having a compressor body that generates compressed air and a motor that drives the compressor body; and a cooling chamber that is partitioned from the machine chamber by an exhaust duct, and that has a cooling fan that takes in air from the intake port and a cooler that cools the compressed air or a lubricant. The machine chamber comprises: an intake duct that takes air from the intake port into the machine chamber; a first duct that is connected to the intake duct between the intake port and the cooling fan; and a suction filter that sucks in the air taken in from the first duct.

Description

Technical Field

[0001] The present invention relates to a packaged air compressor.

Background Art

[0002] Conventionally, packaged air compressors as described in Patent Document 1, Patent Document 2, and Patent Document 3 are known. Patent Document 1 installs a suction filter in the space between the intake port of the package for the cooling fan and the cooling fan, thereby taking in air that is not affected by the heat generated by the equipment into the suction filter and preventing a decrease in the discharged air volume.

[0003] Patent Document 2 discloses a packaged oil-cooled air compressor type in which there is a partition wall separating the machine room A and the cooling room B, taking in air from the intake port of the package, connecting the discharge side of the cooling fan in the cooling room B and the machine room A with a duct, and sending a part of the cooling air into the machine room A. According to Patent Document 2, it is described that the noise sources such as the compressor main body and the motor are better shielded from the outside of the package, and the cooling air can be limitedly flowed to the parts that require it.

[0004] The air compressor of Patent Document 3 has a configuration in which cooling air is taken in from the intake part by a cooling fan, the aftercooler arranged downstream thereof is cooled by the cooling air, and a motor is arranged between the intake part and the cooling fan. Further, Patent Document 3 discloses an air compressor provided with an intake opening for sending a part of the air blown by the cooling fan arranged between the cooling fan and the aftercooler to the compressor main body. According to Patent Document 3, it is described that performance improvement and noise reduction can be achieved with a simple configuration.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the above Patent Document 1, a partition wall for partitioning a space (cooling chamber) that houses an aftercooler, an oil cooler, and a cooling fan and a space (machine room) that houses a compressor body, an intake adjustment valve, a motor, etc. is provided, and in the compressor covered with this in a package, an air inlet is provided at a position above the cooling fan, and a suction filter is installed in this space. Here, although a certain distance is generated between the suction filter and the intake adjustment valve, they are connected by a duct. Thereby, the suction filter takes in the cold air at the air inlet, and supplies this air to the compressor body via the duct and the intake adjustment valve, preventing deterioration of the suction efficiency.

[0007] Generally, a suction filter has a certain filtration area in order to reduce the suction pressure loss and maintain the life of the filter, and is a component that requires an installation space corresponding to this volume. In Patent Document 1, the suction filter is installed in the space between the cooling fan and the air inlet, enabling the intake of cold air. However, at the same time, the intake passage to the cooling fan is blocked, inhibiting the intake of the cooling fan, and it is conceivable that the supply of cooling air to coolers such as the aftercooler and the oil cooler downstream decreases, deteriorating the cooling performance of the cooler.

[0008] Also, in Patent Document 2, the heat generated by the motor is transmitted to the sirocco fan (cooling fan) via the shaft, and the air sucked into the sirocco fan exchanges heat with the heat generated by the motor. Therefore, the temperature of the air taken into the suction filter rises.

[0009] When the temperature of the air taken into the suction filter rises, the density of the compressed air decreases and the amount of air discharged decreases. Therefore, it is desirable that the temperature of the air taken in is lower. Also, the structure of the prior art (Figure 4) described in Patent Document 1 has the same problem that the temperature of the air taken into the suction filter rises.

[0010] Also, in Patent Document 3, the temperature of the air rises due to heat exchange when passing through the motor and the fan motor. Therefore, it has the same problem as Patent Document 2 that the temperature of the air taken into the suction filter (inlet filter) rises and the density of the compressed air decreases.

[0011] An object of the present invention is to provide a packaged air compressor that can keep the temperature of the air taken into the suction filter low without degrading the cooling performance of the cooler.

Means for Solving the Problems

[0012] As a preferred example of the present invention, there is a machinery room having an air intake for taking in air from the outside air, a compressor body for generating compressed air, and a motor for driving the compressor body, and a cooling chamber partitioned from the machinery room by an exhaust duct and having a cooling fan for taking in air from the air intake and a cooler for cooling the compressed air or lubricating oil. The machinery room takes in the air from the air intake into the machinery room See, after cooling the motor with the intake air, send the air to the cooling fan an intake duct, and a first duct connected to the intake duct between the air intake and the Motor and, and a suction filter for sucking in the air taken in from the first duct is a packaged air compressor. and send it to the compressor body through it

Effects of the Invention

[0013] According to the present invention, it is possible to keep the temperature of the air taken into the suction filter low without degrading the cooling performance of the cooler.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment

[0016] The oil-injected screw compressor of Example 1 will be described with reference to FIG. 1. FIG. 1 is a diagram showing the internal structure of an oil-injected screw compressor as an example of a packaged air compressor.

[0017] As shown in FIG. 1, the packaged oil-injected screw compressor 1 has an air intake port 10 for taking in air from the outside air, a machine room 5, and a cooling room 8.

[0018] The machine room 5 includes a compressor main body 2 for generating compressed air, a motor 3 for driving the compressor main body 2, an oil case 13 and an oil separator 14 which are an oil separation mechanism for separating the lubricating oil 13a contained in the compressed air, an intake duct 19 for taking in air from the air intake port 10 into the machine room 5, a pipe 20 connected to the intake duct 19 between the air intake port 10 and the cooling fan 7, a suction filter for sucking in the air taken in from the pipe 20, and the like.

[0019] The cooling room 8 includes an air cooler (cooling device) 6a for cooling the compressed air, an oil cooler 6b for cooling the lubricating oil, a cooling fan 7 for sending air for cooling the air cooler 6a and the oil cooler 6b and taking in air from the air intake port 10, a fan motor 18 for driving the cooling fan 7, and the like. The machine room 5 and the cooling room 8 are partitioned by an exhaust duct 8a.

[0020] In order to suppress the propagation of the noise of the equipment in the machinery room 5 and the cooling room 8 to the outside of the machine, the machinery room 5 and the cooling room 8 are covered with soundproof covers (packages or housings) 9a and 9b.

[0021] The oil-injected screw compressor has a pair of male and female rotors 2a that are parallel to each other in axis and have opposite twisting directions. The air to be compressed is taken in from the intake port of the package. The air to be compressed is removed of foreign matters, dust, etc. in the air by the suction filter installed upstream of the compressor body 2, and then taken into the compressor body 2, and compressed to a predetermined pressure in a state of being mixed with lubricating oil. Next, the compressed air is removed of oil by an oil separation mechanism (oil case 13 and oil separator 14). The compressed air from which the oil has been removed is cooled by a cooler (aftercooler) 6a via the air pipe 16a. The compressed air cooled by the cooler (aftercooler) 6a is discharged outside the oil-injected screw compressor via the air pipe 16b and heads to the user's usage location.

[0022] On the other hand, the separated lubricating oil is once stored in the oil case 13, and then pushed out by the pressure in the oil case 13 and sent to an oil cooler (cooler) 6b via the oil pipe 17a. The lubricating oil is cooled by the oil cooler (cooler) 6b and sent to an oil filter 15 that removes foreign matters, sludge, etc. via the oil pipe 17b. The lubricating oil circulates to the suction side of the compressor body 2 through the oil filter 15.

[0023] The cooling fan 7 takes in outside air from the intake port 10 provided in the machinery room 5. As the intake process, the air passes through the intake duct 19 from the intake port 10 of the package, cools the housing of the motor 3, and then is taken into the cooling fan 7. The intake duct 19 is arranged behind the air pipe 16a in the plane of FIG. 1, but the intake duct 19 may be arranged on the front side of the plane of the air pipe 16a. That is, the intake duct 19 may be arranged so as not to intersect with the air pipe 16a. The cooling fan 7 discharges air, and the air discharged from the cooling fan 7 exchanges heat by passing through the air cooler 6a and the oil cooler 6b installed at the upper part, thereby cooling the compressed air and the lubricating oil.

[0024] Then, the air in the cooling chamber 8 discharged from the cooling fan 7 is discharged from the exhaust port 11. Also, regarding the fan motor 18, a part of the air discharged from the cooling fan 7 passes through the housing of the fan motor 18, so that the fan motor 18 is cooled.

[0025] The suction filter is generally a component composed of an element 4b that removes foreign matters, dust, etc. and a housing 4a that protects it, and it is a component that requires regular replacement and cleaning of the element 4b. Considering the maintainability, it is common to install the suction filter in the machine room 5 where other maintenance parts such as the oil separator 14 and the oil filter 15 are installed. Therefore, the suction filter is installed in the space above the compressor body 2. The outlet side of the housing 4a of the suction filter is connected to the suction throttle valve 12 that adjusts the suction air volume, and the compressor body 2 compresses the air that has passed through the suction throttle valve 12.

[0026] The temperature in the machine room 5 is rising due to the compression heat in the compressor body 2 and the heat generated by the motor 3. In order not to take in the heated air from the suction filter, the inlet side of the housing 4a of the suction filter and the intake duct 19 are connected by a pipe 20 as the first duct, and a part of the outside air flowing in the intake duct 19 is taken in. The position where the pipe 20 is connected to the intake duct 19 is between the intake port 10 and the cooling fan 7, and it is a position in the intake duct 19 on the upstream side of the cooling fan 7 and the motor 3. The air taken into the pipe 20 is cold air that is not affected by the heat of the motor 3 or the like.

[0027] In this embodiment, only the tip of the pipe 20 is inserted into the intake duct 19 and connected in such a way that it is possible to take in the cooling air flow in the intake duct 19 with almost no obstruction. With such a configuration, the suction air compressed by the compressor body 2 can maintain a density equivalent to that of the outside air, and it is possible to prevent a deterioration in the suction efficiency.

[0028] Incidentally, as for the intake of air into the suction filter, as shown in Patent Document 2, a method of taking in a part of the cooling air in the cooling chamber 8 is also conceivable. Specifically, it is also possible to connect the inlet side of the housing 4a of the suction filter and the exhaust duct 8a with a pipe 20. In such a configuration, since the air whose temperature has risen after heat exchange with the motor 3 and the fan motor 18 is taken into the suction filter, a performance degradation may occur. Furthermore, it is also conceivable that the amount of cooling air flowing into the air cooler 6a and the oil cooler 6b decreases by the amount supplied to the suction filter, and both coolers such as the air cooler 6a and the oil cooler 6b may suffer from insufficient cooling.

[0029] In this embodiment, both the air cooler 6a and the oil cooler 6b are arranged in the cooling chamber 8, and both the air cooler 6a and the oil cooler 6b are configured to be cooled by the air from the cooling fan 7. Not limited to such a configuration, only one of the air cooler 6a and the oil cooler 6b may be arranged in the cooling chamber 8 and air-cooled. In that case, the other cooler may be cooled by another method such as water cooling.

[0030] In this embodiment, the intake port 10 is arranged above the cooling fan 7 and the fan motor 18. However, when the cooling fan 7 and the fan motor 18 can be arranged at the upper part, the intake port 10 may be arranged below the cooling fan 7 and the fan motor 18.

[0031] In this embodiment, the oil-injected screw compressor has been described as an example, but it may also be applied to a liquid-injected screw compressor such as a water-injected type, or can also be applied to an oil-free screw compressor.

[0032] In this embodiment, without degrading the cooling performance of the cooler, the temperature of the air taken into the suction filter can be further suppressed to be low, so that the performance of the packaged air compressor can be improved.

Embodiment

[0033] FIG. 2 is a diagram showing the internal structure of the oil-injected screw compressor of Embodiment 2, and is a diagram in which a soundproof box 21 is added to FIG. 1 (Embodiment 1).

[0034] The compressor main body 2 compresses air by the rotation of a pair of male and female rotors 2a while being in contact with each other, and at this time, vibration and noise due to meshing occur. Regarding the noise, it is considered that the noise propagates through the air in the order of the suction throttle valve 12, the suction filter, and the pipe 20 from the inside of the compressor main body 2, diffuses into the intake duct 19, and a part of it leaks out from the intake port 10 of the package. For this reason, the soundproof box 21 is arranged at a position covering the opening where the pipe 20, which is the first duct, is connected to the intake duct 19. By arranging the soundproof box 21 so as to cover the tip of the pipe 20, which is the first duct, entering the intake duct 19, the diffusion of noise in the intake duct 19 is suppressed. The soundproof box only needs to have a function of reverberating and attenuating sound inside, and at least a part of the soundproof box 21 may be made of a soundproof material.

[0035] Here, there is a concern that the soundproof box 21 may obstruct the flow of the cooling air in the intake duct 19. However, generally, the discharged air volume of the compressor (the intake air volume of the suction filter) is sufficiently smaller than the intake air volume of the cooling fan. Therefore, as shown in FIG. 2, the soundproof box 21 can secure a necessary passage area even in a relatively compact shape (flat shape), and suppresses the diffusion of noise without obstructing the flow of the cooling air that is a concern. The degree of freedom in the location where the soundproof box 21 is arranged is high as long as it is a location where the pipe 20, which is the first duct, is connected in the intake duct 19.

[0036] According to this embodiment, by connecting the intake port of the suction filter installed in the machine room to the intake duct for guiding outside air from the intake port of the package to the cooling fan with a pipe, while ensuring sufficient intake passage for the cooling fan, it becomes possible to take in cold air into the suction filter, and deterioration of the suction efficiency can be prevented.

[0037] Furthermore, by installing the soundproof box 21 inside the intake duct 19 so as to cover the tip of the pipe connected to the intake duct 19, while ensuring sufficient intake passage for the cooling fan, it is possible to prevent the propagating compressor noise from coming out of the intake port of the package.

Explanation of Reference Numerals

[0038] 1…Package-type oil-injected screw compressor, 2…Compressor body, 2a…Rotator, 3…Motor, 4a…Housing of suction filter, 4b…Element of suction filter, 5…Machine room, 6a…Air cooler, 6b…Oil cooler, 7…Cooling fan, 8…Cooling chamber, 8a…Exhaust duct, 9a, 9b…Soundproof cover, 10…Intake port of package, 11…Exhaust port of package, 12…Suction throttle valve, 13…Oil case, 13a…Lubricating oil, 14…Oil separator, 15…Oil filter, 16a, 16b…Air pipe, 17a, 17b…Oil pipe, 18…Fan motor, 19…Intake duct, 20…Pipe, 21…Soundproof box

Claims

1. An air intake port for taking in outside air, a machine room that houses a compressor body for generating compressed air and a motor for driving the compressor body, a cooling chamber partitioned by the machine room and an exhaust duct, and that houses a cooling fan for taking in air from the air intake port and a cooler for cooling the compressed air or lubricating oil. The machine room further houses an intake duct having one end connected to the air intake port and the other end opened toward the motor, and a first duct having one end connected to the intake duct and the other end connected to a suction filter that supplies air to the compressor body. The motor is disposed at a position on the air flow path from the outlet of the intake duct to the cooling fan, and a packaged air compressor in which the compressor body is disposed at a position different from the air flow path from the outlet of the intake duct to the cooling fan.

2. In the packaged air compressor according to Claim 1, the suction filter has an element for removing foreign matter and a housing for protecting the element, and a packaged air compressor in which the other end of the first duct is connected to the housing.

3. In the packaged air compressor according to Claim 1, the cooling fan is a packaged air compressor that discharges air and causes the discharged air to pass through the cooler for heat exchange.

4. In the packaged air compressor according to Claim 1, it has a suction throttle valve for adjusting the amount of air from the suction filter, and a packaged air compressor in which the compressor body compresses the air that has passed through the suction throttle valve.

5. In the packaged air compressor according to Claim 1, the cooler is an air cooler and an oil cooler, and is a packaged air compressor.

6. In the packaged air compressor according to Claim 1, the air intake port is disposed above the cooling fan, and a packaged air compressor having an exhaust port for exhausting the air that has passed through the cooler.

7. In the packaged air compressor according to any one of Claims 1 to 6, a soundproof box is disposed so as to cover the opening where the first duct is connected to the intake duct, and it is a packaged air compressor.

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