Hermetic compressor

Abstract

The present invention provides an encapsulated compressor that reduces the leakage of noise generated in a heat exchanger without suppressing the flow rate of the cooling air for the motor. The encapsulated compressor includes a cooling fan (12) that generates a flow of cooling air, an inlet duct (15A) that introduces the cooling air from a cooling air inlet (13A) to the heat exchangers (3 to 6), a plurality of louvers (16) disposed inside the inlet duct (15A), and an inlet duct (15B) that introduces the cooling air from a cooling air inlet (13B) to the motor 1. The cooling air inlet (13A) is arranged such that its position in the vertical direction is the same as that of the heat exchangers (3 to 6). Each louver (16) has a straight portion (19A) that extends in a direction perpendicular to the cooling air passing surface of the heat exchangers (3 to 6) and is inclined upward toward the heat exchangers (3 to 6), and a straight portion (19B) that extends in a direction inclined with respect to the cooling air inlet (13A) and is inclined upward toward the cooling air inlet (13A).

Description

Technical Field

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

[0002] Patent document 1 discloses a packaged compressor. The packaged compressor includes an electric motor, a low-pressure compressor body driven by the electric motor to compress air, an intercooler (heat exchanger) to cool the compressed air discharged from the low-pressure compressor body, a high-pressure compressor body driven by the electric motor to further compress the compressed air cooled by the intercooler, a front cooler (heat exchanger) and an aftercooler (heat exchanger) to cool the compressed air discharged from the high-pressure compressor body, and an oil cooler (heat exchanger) to cool the lubricating oil supplied to the low-pressure and high-pressure compressor bodies.

[0003] The encapsulated compressor includes a housing for accommodating the above-mentioned device and a cooling fan for generating a flow of cooling air in the housing. A first cooling air inlet is formed on one side of the housing, a second cooling air inlet is formed on another side of the housing, and a cooling air outlet is formed on the upper surface of the housing. The cooling fan generates a flow of cooling air introduced from the first and second cooling air inlets and discharged from the cooling air outlet.

[0004] The encapsulated compressor includes a first inlet duct for introducing cooling air from a first cooling air inlet to the above-mentioned multiple heat exchangers, a plurality of louvers arranged inside the first inlet duct in a manner spaced apart from each other in a vertical direction, a second inlet duct arranged on the lower side of the first inlet duct for introducing cooling air from a second cooling air inlet to the motor, and an outlet duct for conducting cooling air from the multiple heat exchangers to a cooling air outlet and being configured to converge the cooling air after passing through the motor.

[0005] The plurality of heat exchangers are arranged in the central part of the housing in a manner away from the first cooling air inlet and the cooling air outlet. Thus, the leakage of noise generated in the heat exchanger to the outside of the compressor is reduced. In addition, the plurality of heat exchangers are arranged above the motor. Thus, the installation area of ​​the compressor is reduced. In addition, the plurality of heat exchangers are arranged in a manner that the cooling air passing surface thereof is inclined relative to the vertical direction. Thus, the height dimension of the compressor is reduced.

[0006] The upper edge of the first cooling air inlet is located below the upper part of the plurality of heat exchangers (specifically, the upper edge of the front surface of the aftercooler), and the lower edge of the first cooling air inlet is located below the lower part of the plurality of heat exchangers (specifically, the lower edge of the front surface of the intercooler or the oil cooler). The first inlet pipe is configured to incline downward from the heat exchanger towards the first cooling air inlet. Each louver is composed of a first straight portion extending in the horizontal direction (in other words, in the direction inclined with respect to the cooling air passing surface of the heat exchanger) on the side of the heat exchanger, a second straight portion extending in the horizontal direction (in other words, in the direction perpendicular to the first cooling air inlet) on the side of the first cooling air inlet, and a third straight portion located between the first straight portion and the second straight portion and inclining downward from the heat exchanger towards the first cooling air inlet. Through the above configuration of the first cooling air inlet and the structure of the first inlet pipe and the louver, the leakage of noise generated in the heat exchanger to the outside of the compressor is reduced.

[0007] Prior Art Documents

[0008] Patent Documents

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-127234 Summary of the Invention

[0010] Problems to be Solved by the Invention

[0011] In the above prior art, through the configuration of the first cooling air inlet and the structure of the first inlet pipe and the louver, the leakage of noise generated in the heat exchanger to the outside of the compressor can be reduced. However, the first inlet pipe is relatively long in the vertical direction, and in order to avoid interference with the first inlet pipe, the size of the second inlet pipe is restricted. Therefore, the flow rate of the cooling air for the motor is suppressed.

[0012] The present invention is made in view of the above circumstances, and one of the problems is to reduce the leakage of noise generated in the heat exchanger without suppressing the flow rate of the cooling air for the motor.

[0013] Means for Solving the Problems

[0014] In order to solve the above problems, the structure described in the claims is applied. The present invention includes various means for solving the above problems. As an example, it is an encapsulated compressor, which includes: a motor; a compressor main body driven by the motor to compress gas; an air-cooled heat exchanger disposed above the motor to cool a fluid; a housing that houses the motor, the compressor main body, and the heat exchanger; a first cooling air inlet formed on one side of the housing; a second cooling air inlet formed on the one side or another side of the housing; a cooling air outlet formed on the upper surface of the housing; a cooling fan that generates a flow of cooling air introduced from the first and second cooling air inlets and discharged from the cooling air outlet; a first inlet pipe that introduces cooling air from the first cooling air inlet to the heat exchanger; a plurality of louvers disposed inside the first inlet pipe at intervals in the vertical direction; and a second inlet pipe disposed below the first inlet pipe to introduce cooling air from the second cooling air inlet to the motor; and in the heat exchanger, a cooling air passing surface thereof is inclined with respect to the vertical direction; and it is characterized in that: the first cooling air inlet is disposed such that its vertical position is the same as that of the heat exchanger, and each of the plurality of louvers has a first straight portion extending in a direction perpendicular to the cooling air passing surface of the heat exchanger in a manner of going to the heat exchanger and being inclined to one side in the vertical direction, and a second straight portion extending in a direction inclined with respect to the first cooling air inlet in a manner of going to the first cooling air inlet and being inclined to one side in the vertical direction.

[0015] Advantages of the Invention

[0016] According to the present invention, it is possible to reduce the leakage of noise generated in the heat exchanger without suppressing the flow rate of the cooling air for the motor.

[0017] In addition, problems, structures, and effects other than the above will be described in the following explanation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a conceptual diagram showing the structure of an encapsulated compressor in one embodiment of the present invention.

[0019] Figure 2 It is a front side perspective view showing the structure of an encapsulated compressor in one embodiment of the present invention.

[0020] Figure 3 It is a right side view showing the structure of an encapsulated compressor in one embodiment of the present invention.

[0021] Figure 4This is a right side perspective view showing the structure of an encapsulated compressor in an embodiment of the present invention.

[0022] Figure 5 This is a left side perspective view showing the structure of an encapsulated compressor in an embodiment of the present invention.

[0023] Figure 6 This is a top view showing the structure of an encapsulated compressor in an embodiment of the present invention.

[0024] Figure 7 This is a front side perspective view showing the structure of an encapsulated compressor in the first modification of the present invention.

[0025] Figure 8 This is a front side perspective view showing the structure of an encapsulated compressor in the second modification of the present invention.

[0026] Figure 9 This is a front side perspective view showing the structure of an encapsulated compressor in the third modification of the present invention. Detailed Embodiment

[0027] Use Figures 1 to 6 to describe an embodiment of the present invention.

[0028] Figure 1 This is a conceptual diagram showing the structure of the encapsulated compressor in this embodiment. Figures 2 to 6 These are a front side perspective view, a right side view, a right side perspective view, a left side perspective view, and a top view showing the structure of the encapsulated compressor in this embodiment. Additionally, Figures 2 to 6 in this, the cooling air inlet and the cooling air outlet are shown as structures with an opening ratio of 100% for convenience, but they can also be mesh structures with an opening ratio less than 100%. Additionally, Figure 2 And Figure 5 in this, the illustration of the suction filter, the suction throttle valve, and the oil supply system is omitted. Additionally, Figure 4 in this, for convenience, the illustration of the louvers inside the inlet pipe is omitted.

[0029] The encapsulated compressor of this embodiment includes a motor 1 (specifically, for example, a permanent magnet motor), a low-pressure stage compressor main body 2A that compresses air (gas) driven by the motor 1, an intercooler 3 (heat exchanger) that cools the compressed air discharged from the low-pressure stage compressor main body 2A, a high-pressure stage compressor main body 2B that further compresses the compressed air cooled by the intercooler 3 driven by the motor 1, a pre-cooler 4 (heat exchanger) and a post-cooler 5 (heat exchanger) that cool the compressed air discharged from the high-pressure stage compressor main body 2B, and an oil cooler 6 (heat exchanger) described later.

[0030] The compressor main body 2A is as follows Figure 1 shown, and includes a pair of male and female screw rotors that mesh with each other, a pair of timing gears that synchronously rotate the screw rotors with each other, and a housing that houses them. A plurality of working chambers are formed in the tooth grooves of the screw rotors. Each working chamber moves in the axial direction of the rotor as the rotor rotates, and at the same time, sequentially performs an intake stroke of sucking in air, a compression stroke of compressing the air, and an exhaust stroke of discharging the compressed air (compressed gas). The compressor main body 2B has substantially the same structure as the compressor main body 2A.

[0031] An intake filter 7 and an intake throttle valve 8 are provided on the intake side of the compressor main body 2A. A gear device 9 is provided between the electric motor 1 and the compressor main bodies 2A and 2B. In the gear device 9, as Figure 1 shown, it has a large gear provided on the rotating shaft of the electric motor 1, small gears that mesh with the large gear and are respectively provided at the end portions of the drive rotors (specifically, one of the male rotor and the female rotor) of the compressor main bodies 2A and 2B, and a gear case that houses them. The compressor main bodies 2A and 2B are driven by transmitting the rotational force of the electric motor 1 via the large gear and the small gears, etc.

[0032] Lubricating oil (liquid) is stored in the lower part of the gear device 9. The oil stored in the lower part of the gear device 9 is supplied to the bearings, etc. of the compressor main bodies 2A and 2B via an oil supply system 10 (liquid supply system). The oil supply system 10 has an air-cooled oil cooler 6 that cools the lubricating oil.

[0033] The packaged compressor of the present embodiment includes a housing 11 that houses the above devices, and a cooling fan 12 that generates a flow of cooling air inside the housing 11. A cooling air inlet 13A (refer to Figure 2 and Figure 3 ) is formed on the right side surface of the housing 11, a cooling air inlet 13B (refer to Figure 4 ) is formed on the rear side surface of the housing 11, and a cooling air outlet 14 (refer to Figure 2 and Figure 5 ) is formed on the upper surface of the housing 11. The cooling fan 12 generates a flow of cooling air that is introduced from the cooling air inlets 13A and 13B and discharged from the cooling air outlet 14. In addition, as Figure 2 shown, a cooling fan dedicated to the electric motor can also be installed on the rotating shaft of the electric motor 1.

[0034] The encapsulated compressor of the present embodiment includes an inlet duct 15A that introduces cooling air into a plurality of heat exchangers 3 to 6 from a cooling air inlet 13A, a plurality of louvers 16 arranged at intervals in the vertical direction inside the inlet duct 15A, an inlet duct 15B arranged below the inlet duct 15A that introduces cooling air into the motor 1 from a cooling air inlet 13B, and an outlet duct 17 that discharges the cooling air from the plurality of heat exchangers 3 to 6 to a cooling air outlet 14. The outlet duct 17 is configured such that the cooling air after passing through the motor 1 flows in through an opening 18 (that is, the cooling air after passing through the plurality of heat exchangers 3 to 6 converges).

[0035] The plurality of heat exchangers 3 to 6 are arranged in the central part of the housing 11 so as to be away from the cooling air inlet 13A and the cooling air outlet 14. Thereby, the situation where the noise generated in the heat exchangers 3 to 6 leaks to the outside of the compressor is reduced. In addition, the plurality of heat exchangers 3 to 6 are arranged above the motor 1. Thereby, the installation area of the compressor is reduced. In addition, the plurality of heat exchangers 3 to 6 are arranged such that their cooling air passing surfaces are inclined with respect to the vertical direction (in the present embodiment, inclined to the right). Thereby, the height dimension of the compressor is reduced.

[0036] Here, as a feature of the present embodiment, the cooling air inlet 13A is arranged such that its vertical position is the same as that of the plurality of heat exchangers 3 to 6. That is, among the upper edges of the cooling air inlet 13A, the vertical position is the same as the upper part of the heat exchangers 3 to 6 (specifically, the upper edge of the front surface of the aftercooler 5), and among the lower edges of the cooling air inlet 13A, the vertical position is the same as the lower part of the heat exchangers 3 to 6 (specifically, the lower edge of the front surface of the intercooler 3 or the oil cooler 6). Thereby, compared with the prior art of Patent Document 1, the inlet duct 15A is shortened in the vertical direction. Therefore, it is possible to avoid the interference between the inlet duct 15A and the inlet duct 15B without restricting the size of the inlet duct 15B (that is, without suppressing the flow rate of the cooling air to the motor 1).

[0037] In addition, as a feature of the present embodiment, each louver 16 has a straight portion 19A that extends in a direction perpendicular to the cooling air passing surface of the heat exchanger in a manner that slopes upward toward the heat exchangers 3 to 6, and a straight portion 19B that extends in a direction inclined with respect to the cooling air inlet 13A (that is, not in a direction perpendicular to the cooling air inlet 13A) in a manner that slopes upward toward the cooling air inlet 13A. With this structure of the louver 16, it is possible to suppress the pressure loss of the cooling air flow path while reducing the situation where the noise generated in the heat exchangers 3 to 6 leaks to the outside of the compressor. Specifically, the noise is shielded and attenuated by the louver 16, and the situation where it leaks to the outside of the compressor can be reduced.

[0038] In addition, in the present embodiment, the inclination angle (included angle) β of the straight portion 19B with respect to the horizontal plane is smaller than the inclination angle (included angle) α of the straight portion 19A with respect to the horizontal plane. From this perspective, the pressure loss of the cooling air flow path can also be suppressed. In addition, among the plurality of louvers 16, one end of the uppermost louver 16 is connected to the upper edge of the front surface of the aftercooler 5, but the other end is not connected to the upper edge of the cooling air inlet 13A.

[0039] As described above, in the present embodiment, it is possible to reduce the leakage of noise generated in the heat exchangers 3 to 6 without suppressing the flow rate of the cooling air for the motor 1. In addition, the structures of the inlet pipes 15A and 15B can be simplified, and the cost can be reduced.

[0040] In addition, in the above-described embodiment, although not particularly described, sound-absorbing materials may be pasted on the inner surfaces of the inlet pipe 15A and the outlet pipe 17 and the surfaces of the louvers 16. Thereby, the leakage of noise generated in the heat exchangers 3 to 6 to the outside of the compressor can be further reduced.

[0041] In addition, in the above-described embodiment, the case where the heat exchangers 3 to 6 are arranged to be inclined to the right, the straight portion 19A of the louver 16 extends upward in a direction perpendicular to the cooling air passing surface of the heat exchanger, and the straight portion 19B of the louver 16 extends upward in a direction inclined with respect to the cooling air inlet 13A has been described as an example, but is not limited thereto. It may also be as Figure 7 shown in the first modification example. The heat exchangers 3 to 6 are arranged to be inclined to the left, the straight portion 19A of the louver 16 extends downward in a direction perpendicular to the cooling air passing surface of the heat exchanger, and the straight portion 19B of the louver 16 extends downward in a direction inclined with respect to the cooling air inlet 13A. In this modification example, the same effects as described above can also be obtained.

[0042] In addition, in the above-described embodiment and modification example, the case where each louver 16 is composed of the straight portions 19A and 19B has been described as an example, but is not limited thereto. It may also be as Figure 8 shown in the second modification example. Each louver 16 is composed of the straight portions 19A and 19B and a curved portion 20 located between the straight portion 19A and the straight portion 19B. In addition, it may also be as Figure 9 shown in the third modification example. Each louver 16 is composed of the straight portions 19A and 19B and a straight portion 19C that extends, for example, in the horizontal direction and is located between the straight portion 19A and the straight portion 19B. In these modification examples, the same effects as described above can also be obtained.

[0043] In addition, in the above-described one embodiment and modification, the case where the cooling air inlet 13B is formed on a side surface of the housing 11 different from the side surface where the cooling air inlet 13A is formed has been described as an example. However, the present invention is not limited thereto, and it may also be formed on a side surface of the housing 11 where the cooling air inlet 13A is formed.

[0044] In addition, in the above-described one embodiment and modification, the case where the compressor bodies 2A and 2B are non-liquid supply type (specifically, gas is compressed without injecting liquid into the working chamber) has been described as an example. However, the present invention is not limited thereto, and it may also be a liquid supply type (specifically, liquid such as oil or water is injected into the compression chamber, and gas is compressed simultaneously).

[0045] In addition, in the above-described one embodiment and modification, the case where the compressor body 2A or 2B is a screw type and includes a pair of male and female screw rotors has been described as an example. However, the present invention is not limited thereto. For example, the compressor body 2A or 2B may also include one screw rotor and multiple gate rotors. In addition, the compressor body 2A or 2B may also be other types than the screw type.

[0046] In addition, in the above-described one embodiment and modification, the case where the packaged compressor includes two compressor bodies 2A and 2B and four heat exchangers 3 to 6 has been described as an example. However, the present invention is not limited thereto. For example, it is sufficient that the packaged compressor includes at least one compressor body and at least one heat exchanger.

[0047] Description of Reference Numerals

[0048] 1... Electric motor

[0049] 2A, 2B... Compressor bodies

[0050] 3... Intercooler (heat exchanger)

[0051] 4... Pre-cooler (heat exchanger)

[0052] 5... After-cooler (heat exchanger)

[0053] 6... Oil cooler (heat exchanger)

[0054] 11... Housing

[0055] 12... Cooling fan

[0056] 13A, 13B... Cooling air inlets

[0057] 14... Cooling air outlet

[0058] 15A, 15B... Inlet pipes

[0059] 16... Louver

[0060] 17…Outlet pipe

[0061] 19A, 19B, 19C… Straight part

[0062] 20… Curved part.

Claims

1. An encapsulated compressor, characterized in that, Comprising: An electric motor; A compressor main body driven by the electric motor to compress gas; An air-cooled heat exchanger disposed above the electric motor to cool a fluid; A housing that houses the electric motor, the compressor main body, and the heat exchanger; A first cooling air inlet formed on one side of the housing; A second cooling air inlet formed on the one side or another side of the housing; A cooling air outlet formed on the upper surface of the housing; A cooling fan that generates a flow of cooling air introduced from the first and second cooling air inlets and discharged from the cooling air outlet; A first inlet duct that introduces cooling air from the first cooling air inlet to the heat exchanger; A plurality of louvers disposed inside the first inlet duct at intervals in the vertical direction; And A second inlet duct disposed below the first inlet duct to introduce cooling air from the second cooling air inlet to the electric motor; and In the heat exchanger, a surface through which cooling air passes is inclined with respect to the vertical direction, wherein The first cooling air inlet is disposed such that its vertical position is the same as that of the heat exchanger, Each of the plurality of louvers is composed of a first straight portion extending in a direction perpendicular to the cooling air passing surface of the heat exchanger in a manner of going to the heat exchanger and inclining toward one side in the vertical direction, and a second straight portion extending in a direction inclined with respect to the first cooling air inlet in a manner of going to the first cooling air inlet and inclining toward the one side in the vertical direction. An inclination angle of the second straight portion with respect to the horizontal plane is smaller than an inclination angle of the first straight portion with respect to the horizontal plane.

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