JP2005069112A - Compressor cooling method of fuel gas feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling method of efficiently cooling a compressor built in a fuel gas feeder through a cooling fan. <P>SOLUTION: The inside of a case in the fuel gas feeder is partitioned into two or more sections, and the compressor 2 and the cooling fan 6 are disposed in a compression chamber 1a as one section. A plate-like diffuser 21 is fitted to a leg part 22a of a support 22 supporting the compressor 2 to surround the outer periphery of a motor part 2b of the compressor 2. The cold air from the cooling fan 6 is substantially all taken in the inside of the plate-like diffuser 21, and flows along the plate-like diffuser 21 to be streamlined. Thus, the motor part 2b of the compressor 2 can be efficiently cooled. Further, the cold air in the streamlined state is sprayed to the compression part 2a so that the compression part 2a can be also efficiently cooled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressor cooling method for a fuel gas supply device that supplies compressed fuel gas to a micro gas turbine or the like.

  Control function consisting of fuel gas inlet, strainer, check valve, snubber tank, compressor, high pressure solenoid valve, fuel gas supply port, ventilation fan, board, relay, etc. 2. Description of the Related Art A fuel gas supply apparatus having a configuration in which a display unit, a display board, an operation switch, and the like are mounted or stored is known (for example, Patent Document 1).

The fuel gas supply device is a natural gas filling device that compresses natural gas supplied from a source tank or the like as a supply source with a compressor to increase the pressure to a predetermined gas pressure, and is installed in an automobile or the like. Are filled with compressed natural gas.
Japanese Patent Laid-Open No. 7-133893

  In the above fuel gas supply apparatus, as shown schematically in FIG. 7, a ventilation port A is formed below the compressor using an isolation wall provided in the box, and the ventilation port A is faced to the ventilation port A to form the ventilation. By installing the fan B and starting the ventilation fan B, the fan B can be blown upward from below. Although not shown, ventilation holes are provided in the four sides on the lower side of the box, and ventilation holes are provided in the four sides on the upper side. When the ventilation fan is activated, outside air flows from the lower ventilation holes, and the upper ventilation is provided. Exhausted from the pores.

  In this case, the ventilation fan B ventilates the inside of the box, so that even if flammable natural gas leaks, the ventilation fan B stays in the box and prevents the rise to the explosion limit concentration. However, it also serves to cool the compressor C located above the ventilation fan B.

  However, in consideration of the cooling action of the compressor C by the ventilation fan B, the air flow from the ventilation fan B spreads radially and becomes turbulent as it goes forward, and the laminar flow is disturbed. There was a problem that the compressor C could not be cooled sufficiently. In particular, the compression section E of the compressor C requires a sufficient amount of heat because of its large calorific value. If the cooling of the compression section E is insufficient, it adversely affects the piston ring and the like, lowers the compression function, and is durable. Will be reduced.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a compressor cooling method for a fuel gas supply device that can efficiently cool a motor section and a compressor section of a compressor. To do.

  As means for achieving the above-mentioned object, claim 1 of the present invention is such that the inside of the case is divided into a plurality of compartments, and a compressor and a cooling fan for cooling the compressor are provided in the compartment. In the fuel gas supply apparatus incorporating the above, a diffuser is provided at the front peripheral portion of the cooling fan, and the diffuser rectifies the cold air from the cooling fan and guides it to the motor section and / or the compression section of the compressor. This is a compressor cooling method for a fuel gas supply device. Thereby, it becomes possible to cool efficiently the motor part or / and compression part of a compressor.

  According to a second aspect of the present invention, in the compressor cooling method for a fuel gas supply apparatus according to the first aspect, the diffuser is attached to a support base leg portion of the compressor so as to surround an outer periphery of a motor portion of the compressor. It is characterized by that. Thereby, since the cold wind from the cooling fan is rectified by the diffuser, the motor section of the compressor can be efficiently cooled. Moreover, since the cold air which passed the outer peripheral part of the motor part is sprayed also to the compression part of a compressor with a rectification | straightening state, a compression part can be cooled efficiently.

  According to a third aspect of the present invention, in the compressor cooling method of the fuel gas supply apparatus according to the first aspect, the diffuser is attached to the inner wall surface of the compartment so as to surround the outer periphery of the compression portion of the compressor. It is characterized by. As a result, the cool air from the cooling fan passes through the outer peripheral portion of the motor unit, and is then rectified toward the center side by the diffuser and guided to the compression unit of the compressor, so that the compression unit can be efficiently cooled. .

  According to a fourth aspect of the present invention, in the compressor cooling method of the fuel gas supply device according to the first aspect, the diffuser is attached to an inner wall surface of the compartment so as to surround a front outer periphery of the cooling fan. Features. Thus, the cold air from the cooling fan is rectified toward the center by the diffuser and guided to the motor portion of the compressor, so that the motor portion can be efficiently cooled.

  According to a fifth aspect of the present invention, in the compressor cooling method for a fuel gas supply apparatus according to the first aspect, the diffuser is attached to an inner wall surface of the compartment, and an outer periphery of a compression portion of the compressor, and the cooling fan. It is characterized by surrounding the front outer periphery of each. Thereby, since the cold air from the cooling fan is rectified toward the center by the diffuser and guided to the motor unit and the compression unit of the compressor, both the motor unit and the compression unit can be efficiently cooled.

  According to the compressor cooling method of the fuel gas supply apparatus according to claim 1 of the present invention, the inside of the case is divided into a plurality of compartments, and the compressor and the cooling for cooling the compressor in the one compartment. In the fuel gas supply apparatus in which the fan is incorporated, a diffuser is provided in a front peripheral portion of the cooling fan, and the diffuser cools the cool air from the cooling fan by the diffuser, and the motor unit and / or the compression unit of the compressor Therefore, the motor part and / or the compression part of the compressor can be efficiently cooled.

  According to the compressor cooling method of the fuel gas supply apparatus according to claim 2 of the present invention, in the invention of claim 1, the diffuser is attached to a support base leg portion of the compressor, and the outer periphery of the motor portion of the compressor. In particular, the motor section of the compressor can be efficiently cooled, and the cold air that has passed through the outer periphery of the motor section is blown to the compressor section of the compressor in a rectified state. Also has the effect of cooling efficiently.

  According to the compressor cooling method of the fuel gas supply apparatus according to claim 3 of the present invention, in the invention of claim 1, the diffuser is attached to the inner wall surface of the compartment and surrounds the outer periphery of the compression portion of the compressor. Since it did in this way, there exists an effect which can cool a compression part especially efficiently.

  According to the compressor cooling method of the fuel gas supply device according to claim 4 of the present invention, in the invention of claim 1, the diffuser is attached to the inner wall surface of the compartment so as to surround the front outer periphery of the cooling fan. As a result, the cool air from the cooling fan is rectified and guided to the motor part of the compressor, so that the motor part can be efficiently cooled.

  According to the compressor cooling method of the fuel gas supply apparatus according to claim 5 of the present invention, in the invention of claim 1, the diffuser is attached to the inner wall surface of the compartment, and the outer periphery of the compression portion of the compressor, and Since the front outer periphery of the cooling fan is respectively surrounded, there is an effect that both the motor unit and the compression unit can be efficiently cooled.

  Next, an embodiment in which the present invention is applied to a fuel gas supply device for a micro gas turbine will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing a system configuration of a fuel gas supply device for a micro gas turbine, FIG. 2 is a schematic perspective view of the fuel gas supply device for a micro gas turbine, and FIG. 3 is a first embodiment according to the present invention. (A) is a perspective view of a plate-like diffuser, (b) is a schematic bottom view of a state where a plate-like diffuser is attached, (c) is an explanatory diagram of a use state, and FIG. 2 shows an embodiment, (a) is a perspective view of a three-dimensional diffuser, (b) is a schematic perspective view of a state in which a three-dimensional diffuser is attached, (c) is a schematic top view thereof, and (d) is a use state. FIG. 5 shows a third embodiment according to the present invention, an explanatory diagram of its use state, and FIG. 6 shows a fourth embodiment according to the present invention, an explanation of its use state. FIG. 7 is an explanatory diagram showing a conventional example.

The fuel gas supply apparatus shown in FIG. 1 compresses a fuel gas such as city gas to a predetermined gas pressure, and supplies the compressed fuel gas to a micro gas turbine.
This fuel gas supply device for a micro gas turbine accommodates a compressor 2 in a case 1, a buffer tank 3 for feeding the fuel gas into the compressor 2, and a fuel gas compressed by the compressor 2 and its compression A reservoir tank 4 for supplying fuel gas to the outside, a cooling fan 6 for cooling the compressor 2, and the like are housed.

  In addition, a low pressure switch 7, a strainer 14, a solenoid valve 8, and a low pressure side check valve 5 are disposed in the gas introduction path P from the gas inlet to the buffer tank 3. A high-pressure check valve 9, a high-pressure switch 10 and the reservoir tank 4 are disposed in the gas outlet path Q from the gas outlet to the gas outlet. A control circuit 11 is connected to the high-pressure switch 10 and the compressor 2 and receives the signal from the high-pressure switch 10 to control the compressor 2 so that the discharge gas pressure is constant.

  Further, a first bypass R and a second bypass R connecting the location before the high-pressure check valve 9 on the downstream side of the compressor 2 and the location before the buffer tank 3 on the upstream side of the compressor 2. A bypass S is provided in parallel, and a capacity control valve 12 is provided in the first bypass R, and a relief valve 13 is provided in the second bypass S.

  In the system circuit having the above configuration, when fuel gas such as city gas is supplied from the gas inlet, the low pressure switch 7 is turned on to open the electromagnetic valve 8 and the fuel gas is accommodated in the buffer tank 3. The reverse flow of the fuel gas is blocked by the check valve 5. The fuel gas stored in the buffer tank 3 is sent to the compressor 2 and compressed to a predetermined gas pressure (for example, 600 kPa), and the compressed fuel gas discharged from the compressor 2 is stored in the reservoir tank 4. The compressed fuel gas discharged from the reservoir tank 4 is sent to the micro gas turbine 15 from the gas outlet. In order to prevent excessive supply of compressed fuel gas, when the amount of gas from the compressor 2 to the reservoir tank 4 exceeds a certain amount, the high pressure switch 10 is turned on and the capacity control valve 12 is opened, and a part of the compressed fuel gas Is returned to the buffer tank 3 via the first bypass R.

  As shown schematically in FIG. 2, the components of the system circuit are accommodated in a compartment that divides the interior of the case 1, and in this case, the compartment is divided into three compartments: a compression chamber 1a, an element chamber 1b, and a control chamber 1c. It is divided. Among them, the compressor 2 and the cooling fan 6 are accommodated in the compression chamber 1a, and the buffer tank 3, the reservoir tank 4, the check valves 5, 9 and the pressure switch are accommodated in the element chamber 1b. An electrical box 16 is disposed in the control room 1c. Reference numeral 17 denotes a heat radiating fan provided on the upper side surface of the electrical box 16, and reference numeral 18 denotes an outlet provided on the side surface of the case 1 so as to face the heat radiating fan 17. Reference numeral 19 denotes a partition plate, and 20 denotes a mounting plate for the electrical box 16. In addition, a system circuit is comprised by connecting each structural member by piping and wiring which are not shown in figure.

  FIG. 3 shows a first embodiment of the present invention. FIG. 3A shows a diffuser formed in a plate shape. The plate diffuser 21 is formed by bending a substrate portion 21a and both sides thereof. The board portion 21a is gradually widened downward. Although the material of this plate-shaped diffuser 21 is not limited, For example, it is preferable to form with a heat resistant material.

  The plate-like diffuser 21 is mounted by fixing the mounting portion 21b to the leg portion 22a of the support base 22 (FIG. 2) supporting the compressor 2 as shown in FIG. The plate-like diffuser 21 surrounds the outer periphery of the motor portion 2b of the compressor 2.

  When the plate-like diffuser 21 is attached in this way, almost all of the cold air (outside air) from the cooling fan 6 is taken into the plate-like diffuser 21 as shown in FIG. Therefore, it will be rectified. Thereby, the motor part 2b of the compressor 2 can be cooled efficiently.

Further, the cold air that has passed through the inside of the plate-like diffuser 21 is blown to the compression portion 2a of the compressor 2 through the gap between the leg portions 22a of the support base 22 while being in a substantially rectified state.
Therefore, the compression part 2a of the compressor 2 can also be efficiently cooled. And after cooling the compression part 2a, it discharges | emits outside from the discharge port 1d (FIG. 2) provided in the upper side surface of the said case 1. FIG.

  FIG. 4 shows a second embodiment of the present invention, in which (a) shows a diffuser formed in a three-dimensional shape, and this three-dimensional diffuser 23 is formed in a substantially triangular pyramid having four planes. Has been. Although the shape and size of the three-dimensional diffuser 23 are not limited, it is preferable that the three-dimensional diffuser 23 has a shape that can be easily attached to the inner wall of the compression chamber 1a of the case and a surface that can easily rectify the cold air from the cooling fan 6. . The material of the three-dimensional diffuser 23 is not limited, but can be formed of, for example, rubber or urethane foam.

  The three-dimensional diffuser 23 is attached to the four corners of the inner wall surface of the compression chamber 1a so as to be positioned on the outer periphery of the compression unit 2a of the compressor 2 as shown in FIG. At this time, the surface 23a of the three-dimensional diffuser 23 is attached so as to face the inside of the compression chamber 1a and to incline upward toward the inside. By attaching in this way, the outer periphery of the compression part 2a is almost surrounded by the three-dimensional diffuser 23 as shown in FIG. The one surface 23a of the three-dimensional diffuser 23 is not limited to a flat surface, and may be a curved surface suitable for rectification, for example.

  In this embodiment, the cool air from the cooling fan 6 passes through the periphery of the motor unit 2b of the compressor 2 as shown in FIG. It is rectified by 23a and sprayed to the compression part 2a. Therefore, the compression part 2a of the compressor 2 can be efficiently cooled. And after cooling the compression part 2a, it is discharged | emitted from the discharge port 1d of the said case 1 outside.

  When the three-dimensional diffuser 23 is formed of a sound absorbing material such as urethane foam, not only the rectifying action but also the sound absorbing action can be obtained, and the noise generated in the compression portion 2a is absorbed to reduce the noise to the outside. Is possible. Further, when the three-dimensional diffuser 23 is formed of rubber or the like, not only a rectifying action but also a vibration isolating action can be obtained, and the compression chamber 1a or the case 1 can be absorbed by absorbing the vibration generated in the compression portion 2a. Can be prevented as much as possible.

  FIG. 5 shows a third embodiment of the present invention, in which the three-dimensional diffuser 23 is attached to the four corners of the inner wall surface of the compression chamber 1 a so as to be positioned on the front outer periphery of the cooling fan 6. At this time, the surface 23a of the three-dimensional diffuser 23 is attached so as to face the inside of the compression chamber 1a and to be inclined upward toward the outside (inner wall direction). By mounting in this way, the front outer periphery of the cooling fan 6 is substantially surrounded by the three-dimensional diffuser 23.

  In the present embodiment, the cold air from the cooling fan 6 is rectified by the one surface 23 a of the three-dimensional diffuser 23 and rises along the outer periphery of the motor portion 2 b of the compressor 2. Therefore, the motor part 2b of the compressor 2 can be efficiently cooled. And after rising along the outer periphery of the motor part 2b of the compressor 2, since the cool air blows to the compression part 2a in the rectified state, the compression part 2a can be efficiently cooled.

  FIG. 6 shows a fourth embodiment of the present invention, which is a combination of the second embodiment and the third embodiment. That is, the three-dimensional diffuser 23 is attached to the four corners of the inner wall surface of the compression chamber 1 a so as to be positioned on the outer periphery of the compression portion 2 a of the compressor 2, and is positioned on the front outer periphery of the cooling fan 6. Attach to the four corners of the inner wall of 1a. At this time, the three-dimensional diffuser 23 on the compression unit 2a side is attached so that one surface 23a faces the inside of the compression chamber 1a and is inclined upward toward the inside, so that the outer periphery of the compression unit 2a is three-dimensional diffuser 23. So that it is almost surrounded. On the other hand, the three-dimensional diffuser 23 on the cooling fan 6 side is attached so that its one surface 23a faces the inner side of the compression chamber 1a and inclines upward toward the outer side (inner wall direction). The outer periphery is substantially surrounded by the three-dimensional diffuser 23.

  In the present embodiment, the cold air from the cooling fan 6 is rectified by one surface 23a of the three-dimensional diffuser 23 on the cooling fan 6 side and rises along the outer periphery of the motor portion 2b of the compressor 2, and the rising cold air Is rectified again by one surface 23a of the three-dimensional diffuser 23 on the compression unit 2a side and sprayed onto the compression unit 2a. Therefore, both the motor part 2b and the compression part 2a of the compressor 2 can be efficiently cooled. And after cooling the compression part 2a, it is discharged | emitted from the discharge port 1d of the said case 1 outside.

  When the three-dimensional diffuser 23 on the compression part 2a side is formed of a sound absorbing material such as urethane foam, not only a rectifying action but also a sound absorbing action can be obtained, and the noise generated in the compression part 2a is absorbed and externally applied. It is possible to mitigate noise. Further, when the three-dimensional diffuser 23 is formed of rubber or the like, not only a rectifying action but also a vibration isolating action can be obtained, and the compression chamber 1a or the case 1 can be absorbed by absorbing the vibration generated in the compression portion 2a. Can be prevented as much as possible.

  The present invention is a cooling method for a compressor incorporated in a device, and can be effectively applied particularly as a cooling method for a compressor incorporated in a fuel gas supply device.

It is the schematic which shows the system configuration | structure of the fuel gas supply apparatus for micro gas turbines. It is a schematic perspective view of the fuel gas supply apparatus for micro gas turbines. BRIEF DESCRIPTION OF THE DRAWINGS It shows 1st Embodiment which concerns on this invention, (a) is a perspective view of a plate-shaped diffuser, (b) is a schematic bottom view of the state which attached the plate-shaped diffuser, (c) is explanatory drawing of a use condition. is there. FIG. 2 shows a second embodiment according to the present invention, in which (a) is a perspective view of a three-dimensional diffuser, (b) is a schematic perspective view with a three-dimensional diffuser attached, (c) is a schematic top view thereof, ( d) is an explanatory diagram of the state of use. The 3rd Embodiment which concerns on this invention is shown, and it is explanatory drawing of the use condition. The 4th Embodiment concerning this invention is shown and it is explanatory drawing of the use condition. It is explanatory drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Compressor 2a Compression part 2b Motor part 3 Buffer tank 4 Reservoir tank 5 Low pressure side check valve 6 Cooling fan 7 Low pressure switch 8 Solenoid valve 9 High pressure side check valve 10 High pressure switch 11 Control circuit 12 Capacity control Valve 13 Relief valve 14 Strainer 15 Micro gas turbine 21 Plate diffuser 22 Support base 22a Leg 23 Three-dimensional diffuser 23a

Claims (5)

  In the fuel gas supply apparatus in which the inside of the case is divided into a plurality of sections, and a compressor and a cooling fan for cooling the compressor are incorporated in the section, a front peripheral portion of the cooling fan A method for cooling a compressor of a fuel gas supply apparatus, comprising: a diffuser provided in the compressor, wherein the diffuser rectifies cool air from a cooling fan and guides the air to a motor section and / or a compressor section of the compressor.   2. The compressor cooling method for a fuel gas supply apparatus according to claim 1, wherein the diffuser is attached to a support base leg portion of the compressor so as to surround an outer periphery of a motor portion of the compressor.   2. The compressor cooling method for a fuel gas supply apparatus according to claim 1, wherein the diffuser is attached to an inner wall surface of the compartment so as to surround an outer periphery of a compression portion of the compressor.   2. The compressor cooling method for a fuel gas supply apparatus according to claim 1, wherein the diffuser is attached to an inner wall surface of the compartment so as to surround a front outer periphery of the cooling fan.   2. The fuel gas supply device according to claim 1, wherein the diffuser is attached to an inner wall surface of the compartment so as to surround an outer periphery of a compression portion of the compressor and a front outer periphery of the cooling fan. Compressor cooling method.

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