KR100416942B1 - System for compressing fluid - Google Patents

Abstract

The present invention relates to a gas compression system having two or more compression tanks. The present invention provides a compressor (C) for compressing gas, a motor (M) having a cooling fan (14) at the end of the rotating shaft (12), and a high temperature compressor body discharged from the compressor so as to pass sequentially. At least two connected in series and adjacently arranged in a parallel direction so that the cooling fan of the motor faces the compressor above the interspace formed by the parallel arrangement. The above-mentioned cylindrical compression tank, dustproof rubber (18, 18 ', 20, 20') installed in the space between the compression tank and the compressor (C) and the motor (M) are installed, idle pulley, power transmission belt and tension control It includes a member, and includes a power transmission unit for transmitting to the drive shaft 16 of the compressor (C) in a state in which the rotational force of the rotary shaft 12 is decelerated. As a result, vibration noise caused by driving of the motor and the compressor can be suppressed, the cooling effect of the compressor can be maximized, the amount of moisture discharged with the air from the compression tank can be reduced, and the assembly and tension of the belt can be controlled. Can be facilitated.

Description

Gas Compression System {SYSTEM FOR COMPRESSING FLUID}

The present invention relates to a gas compression system having two or more compression tanks, and more particularly, to suppress vibration noise caused by driving of a motor and a compressor, to maximize the cooling effect of the compressor, and to provide air from the compression tank. The present invention relates to a gas compression system that can reduce the amount of moisture discharged with and facilitate the assembly and tensioning of the belt.

A compressor is a device that increases the pressure and speed of a medium to be compressed by applying power from the outside to a gas such as air, nitrogen, or oxygen, and a liquid such as oil or a refrigerant. Such a compressor comprises a cylinder provided with an intake / exhaust valve and a piston for linearly reciprocating the inside of the cylinder, and a reciprocating compressor for compressing gas by the reciprocating motion of the piston, and a rotating shaft as disclosed in JP-A-61-65081 By transmitting the rotational force of the swash plate to convert the piston connected to the swash plate to a linear reciprocating motion can be divided into a four-axis compressor to compress the gas.

The reciprocating compressor or bent axis compressor described above generally comprises a compression system with a motor for driving the compressor and one compression tank for storing the compressed medium discharged from the compressor.

In order to improve the convenience of use and to reduce the installation space, a gas compression system having a compressor generally uses a bracket in a compression tank and a thin rubber pad on the bracket to use the four bolts of the compressor and the motor. It has a structure to be fixed integrally. At this time, the compressor and the motor are installed in parallel in the direction perpendicular to the compression tank.

By the way, the conventional gas compression system has only one compression tank, so unless there is a separate filtration device, there is a problem that the moisture produced by the gas compressed at high temperature is discharged together with the gas without being filtered out.

In addition, in the fixed structure using the bracket, the vibration noise of the compressor is directly transmitted to the compression tank through the bracket and the rubber pad, so that a phenomenon of amplifying the noise occurs.

In addition, the conventional gas compression system has a structure for transmitting the driving force of the motor to the compressor using a reducer or a power transmission belt, the power transmission structure using a reducer or power transmission belt is a cooling using a large reduction ratio and a high speed cooling cooling fan. It is not easy to use in a gas compression system that requires simultaneously.

Because the power transmission structure using the reducer is difficult to rotate the cooling fan at high speed, there is a problem that noise occurs, the power transmission structure using the belt is complicated structure and production is required because a separate component for rotating the cooling fan at high speed is required. This is because not only the cost is increased but also the volume of the product must be proportionally increased in order to increase the reduction ratio.

In addition, the power transmission structure using the power transmission belt is fixed to the motor side or the compressor side in order to adjust the tension of the belt or to replace the belt because the compressor and the motor are fixed with the bracket of the compression tank and four bolts. The four bolts must be dismantled, and after changing the belt, the motor and compressor must be pushed in the far direction to maintain the tension of the belt. It is difficult to pay.

The present invention has been made to solve the problems of the conventional gas compression system, the object is to provide a gas compression system that can reduce the water content of the gas discharged from the compression tank.

Another object of the present invention is to provide a gas compression system having a simple design that can suppress vibration noise caused by driving of a motor and a compressor.

Another object of the present invention is to provide a gas compression system that can maximize the cooling effect of the compressor.

Another object of the present invention is to provide a gas compression system that can facilitate assembly and tension adjustment of the power transmission belt.

1 is a schematic exploded perspective view of a gas compression system according to the present invention.

FIG. 2 is a schematic cross-sectional view along the X axis of FIG. 1 showing an assembled state of a gas compression system according to the present invention. FIG.

3 is a schematic cross-sectional view in the Y-axis direction of FIG. 1 showing the assembled state of the gas compression system according to the present invention.

In order to achieve the first object described above, the present invention is installed by connecting two or more, preferably four cylindrical compression tanks in series using pipes, and the high temperature compressor body discharged from the compressor sequentially passes through the compression tanks. While providing a gas compression system that allows the temperature to drop.

In order to achieve the second object described above, the present invention comprises a pair of two compression tanks disposed adjacent to each other in a parallel direction, and the other pair of compression tanks are disposed at positions adjacent in the longitudinal direction of the compression tank. To provide a gas compression system in which dustproof rubbers are respectively installed in spaces between compression tanks formed due to parallel arrangement, and motors and compressors are fixedly installed on the dustproof rubbers, respectively.

In order to achieve the third object, the present invention is installed in series with the motor and the compressor facing each other, and fixed to the end of the rotary shaft of the motor adjacent to the compressor by the pulley and the cooling fan fixed by the compressor A gas compression system is provided to allow cooling of the gas.

In order to achieve the fourth object, the present invention comprises a power transmission unit for transmitting the driving force of the motor to the compressor comprises an idle pulley, a power transmission belt and a tension control member, the power transmission unit between the two pairs of compression tanks Provide a gas compression system installed in the space.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic exploded perspective view of a gas compression system according to the present invention, Figure 2 is a schematic cross-sectional view in the X axis of Figure 1 showing the assembled state of the gas compression system according to the present invention. 3 is a schematic sectional view in the Y-axis direction of FIG. 1 showing the assembled state of the gas compression system according to the present invention.

The gas compression system according to the present invention includes a compressor (C) for compressing gas, a pulley (34) and a cooling fan (14) at the end of the rotating shaft (12), and provides a driving force for driving the compressor (C). The motor C, the two or more compression tanks in which the high-temperature compressor body discharged from the compressor C is stored (which will be described as four in this embodiment), and the rotational force of the rotating shaft 12 may be measured by the compressor C. It includes a power transmission unit for transmitting to the drive shaft (16) of.

The compression tank is composed of a pair of two compression tanks disposed adjacent to each other in a parallel direction, and a pair of compression tanks are arranged at a position adjacent in the longitudinal direction of the compression tank. The first to fourth compression tanks T1, T2, T3, and T4 in the counterclockwise direction of FIG.

The first to fourth compression tanks T1 to T4 are connected in series in a clockwise or counterclockwise direction by adjacent compression tanks and pipes P2, P3, P4, and P5. Here, unexplained reference numeral P1 denotes a pipe of the first compression tank T1 connected to the exhaust part of the compressor C. At this time, the pipes (P1 ~ P4) is a pipe that is open at both ends, the pipe (P5) is a pipe end of the fourth compression tank (T4) side is closed.

According to the tank arrangement structure and the pipe connection structure, the compressor (C) and the motor (M) above the first and second compression tanks T1 and T2 and the third and fourth compression tanks T3 and T4 arranged in parallel. ) Can be installed in series in the longitudinal direction parallel to the compression tanks T1 to T4.

In addition, as the high temperature compressor body discharged from the compressor C sequentially passes through the first to fourth compression tanks T1 to T4, the temperature drops, and the temperature of the gas in the fourth compression tank T4 is room temperature. Since it is maintained at a temperature close to, the dehumidification effect can be improved.

Hereinafter, the principle that the temperature of the compressor body drops and the principle that the dehumidification effect is improved according to the temperature drop will be described.

The temperature of the compressor body flowing into the first to fourth compression tanks T1 to T4 is called t1, t2, t3, t4, and the temperature of the compressor body discharged from the fourth compression tank T4 is called t5. When the atmospheric temperature is t0, the amount of heat Q1 to Q4 emitted from each of the compression tanks can be expressed as shown in [Equation 1] to [Equation 4].

Q1 = K × A × (t1-t0) --------------------- [Equation 1]

Q2 = K × A × (t2-t0) --------------------- [Equation 2]

Q3 = K × A × (t3-t0) --------------------- [Equation 3]

Q4 = K × A × (t4-t0) --------------------- [Equation 4]

In Equations 1 to 4, A is the surface of each compression tank, and K is a proportionality constant. The proportionality constant is related to the flow of gas and air in the material and internal and external surface area of the compression tank, but for simplicity of explanation, it is assumed that the proportionality constant is the same in the present invention, and the surface area of each compression tank is also the same. Assumed.

Therefore, a compressor body in which thermal energy is reduced by the amount of heat Q1 discharged from the first compression tank T1 flows into the second compression tank T2, and the second compression tank T2 enters the third compression tank T3. Compressor body whose heat energy is reduced by the amount of heat Q2 emitted from the gas is introduced. In addition, a compressor body in which thermal energy is reduced by the amount of heat Q3 discharged from the third compression tank T3 is introduced into the fourth compression tank T4, and the fourth compression tank T4 discharges from the tank T4. The compressor body whose heat energy by the amount of heat Q4 is reduced is discharged.

However, since the above-mentioned decrease in thermal energy means that the temperature of the compressor body is lowered, the temperature of the compressor body has a relationship of t1> t2> t3> t4> t5.

On the other hand, the maximum content of moisture that the gas can contain increases in absolute amount as the temperature increases. The relative humidity, which represents the current moisture content as a ratio of the maximum moisture content that the gas can contain under a certain temperature, gradually increases as the temperature decreases, eventually reaching 100%. The temperature at this time is referred to as a saturation temperature, when the temperature of the compressor body is lower than the saturation temperature, the maximum moisture content that the gas can contain is lowered.

Therefore, when the moisture contained in the compressor body flowing into the first compression tank T1 is m1 and the moisture contained in the compressor body discharged from the fourth compression tank T4 is m2, the fourth compression is performed. Since the temperature t5 of the compressor body discharged from the tank T4 is lower than the saturation temperature, the amount W of water generated when the temperature of the compressor body changes from t1 to t5 can be expressed as shown in [Equation 5].

W = m1-m2 --------------------------------------------- [Equation 5]

By the way, when the temperature and relative humidity of the compressor body flowing into the compression tank is assumed to be constant, the lower the temperature of the compressor body discharged from the compression tank, the higher the amount of water (W), so the amount of water (W) Is proportional to the temperature difference t1-t5 of the compressor body.

Therefore, as the temperature of the compressor body discharged from the fourth compression tank T4 is lower, the moisture content of the compressor body is reduced, and the dehumidification effect is improved.

During the temperature drop process, the pressures in the respective compression tanks remain the same, because the pressure loss caused by the loss of velocity energy when the compressor body inside the compression tank passes through the pipe is very small. It is a value, and it is because each compression tank communicates with each other by piping.

On the other hand, in order to install the compressor C and the motor M in series, the dustproof materials 18 and 18 'for motors are provided in the space formed between the compression tanks T3 and T4 arrange | positioned in parallel. In addition, in the space formed between the compression tanks T1 and T2 arranged in parallel, compressor dustproof materials 20 and 20 'are provided. Here, the vibration dampers (18, 18 ', 20, 20') is to prevent the vibration caused by the drive of the motor and the compressor to be transmitted to the compression tank, the vibration dampers (18, 18 ', 20, 20) '), The motor M and the compressor C are fixedly installed in series with the cooling fan 14 facing the compressor C, respectively.

Looking at the installation structure of the motor (M) and the compressor (C) in more detail, the bracket (24) is fixed to the compressor (C) and the motor (M), respectively. In addition, one end of the connecting rod 26 is fixed to the bracket 24 by a fastening bolt 26 '.

At this time, the connecting rod 26 is installed through the anti-vibration rubber (18, 18 ', 20, 20') inserted into the space between the compression tank, respectively. The anti-vibration rubber has a shape that can prevent the flow in the vertical direction in the installation state, that is, the width of the upper side and the lower side is formed larger than the width of the middle side. In addition, the clamp nut 30 is fixed to the other end of the connecting rod 26 with the tightening plate 28 interposed between the dustproof rubbers 18, 18 ', 20, and 20'. (M) is indirectly fastened to the compression tank.

In FIG. 2, only one fastening plate 28 and a fastening nut 30 are shown for the sake of simplicity.

Therefore, the motor M and the compressor C are firmly installed on the anti-vibration rubber 18, 18 ', 20, 20'. In addition, since the cooling fan 14 which is rotated at a high speed integrally with the rotary shaft 12 faces the compressor C, the cooling of the compressor C is effectively performed.

A protective cover 32 is provided outside the cooling fan 14 to guide the cooling air blown from the cooling fan 14 to the compressor C by the protective cover 32. Further increase the cooling effect.

On the other hand, the rotation shaft 12 of the motor M is provided with a pulley 34 which rotates integrally with the rotation shaft 12, the diameter of the larger than the pulley 34 at the end of the drive shaft 16 of the compressor (C). The pulley 36 is installed to rotate integrally with the drive shaft 16.

Here, looking at the structure of the power transmission unit for transmitting the driving force of the motor (M) to the compressor (C) in detail, the power transmission unit idle pulley assembly 70 and the power transmission belt (44, 44 ') and the tension control member And 72. The idle pulley assembly 70 includes a shaft 42 having idle pulleys 38 and 40 at both ends, and a shaft housing 42 ′ supporting the shaft 42 via a bearing 46. The tension adjusting member 72 includes a tension plate 48 for supporting the shaft housing 42 'downward.

One side of the tension plate 48 is in contact with the tube 50 at the lower side of the pipe P5 which integrally connects the first and fourth compression tanks T1 and T4 adjacent in the longitudinal direction, and the other side of the tension plate 48 The end of the tension adjusting bolt 54 penetrates the bracket 52 fixed to the pipe P3 of the second and third compression tanks T2 and T3. The lower surface of the tension plate 48 is in contact with the upper surface of the shaft housing 42 '. To this end, the upper surface of the shaft housing 42 'is formed with a groove (not shown) in which the tension plate 48 is seated.

Therefore, the tension plate 48 and the tension adjustment bolt 54 constitutes the tension control member 72 of the present invention.

Here, reference numeral 56 denotes a fixing bolt for fixing the shaft housing 42 'and the tension plate 48, and reference numeral 58 denotes a cover for protecting the idle pulley.

The power transmission belts 44 and 44 ′ connect the idle pulleys 38 and 40 to the pulleys 34 of the motor M and the pulleys 36 of the compressor C, respectively.

Therefore, when the tension adjusting bolt 54 in contact with the tension plate 48 is rotated so that the tension plate 48 is rotated about the pipe P5, tension adjustment and exchange of the belts 44 and 44 'are easy. It can be done.

In the above description, the power transmission unit includes the idle pulley assembly 70, the power transmission belts 44 and 44 ', and the tension adjusting member 72. However, in the small-capacity compressor, the rotation shaft 12 of the motor M and The drive shaft 16 of the compressor C may be directly connected by using a universal coupling.

Meanwhile, wheels 60 for movement are installed in the first and second compression tanks T1 and T2, and pedestals 62 are installed in the third and fourth compression tanks T3 and T4. At this time, the pedestal 62 serves to absorb the vibration transmitted to the compression tank and to fix the gas compression system to the bottom surface.

In addition, the pipes P2 and P4 connecting the first and second compression tanks T1 and T2 and the third and fourth compression tanks T3 and T4 disposed in parallel in the width direction are handled when the system moves. It is formed into an upwardly curved shape for use. Therefore, when the gas compression system is moved, the system can be moved by using the wheel 60 after lifting the pipe P4. In addition, when the system is not in use, the system may be stored vertically by the pipe P4 and the pedestal 62.

In addition, the plate member 68 installed in the space between the second and third compression tanks T2 and T3 extending in the longitudinal direction is provided with a pressure switch panel assembly 64, and the first and fourth compression tanks ( The air discharge meter substrate assembly 66 is installed in the plate member 68 'installed in the space between T1 and T4.

Here, the pressure switch instrument assembly 64 may be composed of a pressure gauge (not shown) and a pressure control valve (not shown), the air discharge meter substrate assembly 66 is a discharge pressure gauge (not shown) and the discharge port (Not shown).

In addition, although not shown, some compression tanks are equipped with safety valves and a water discharge valve for discharging water.

On the other hand, one example of the compressor (C) used in the gas compression system of the present invention is a bent axis compressor having a multi-stage exhaust system which is filed by the applicant of the present application in the domestic application number 10-2001-43553.

The compressor (C) transmits the rotational force of the drive shaft (16) to the swash plate to linearly reciprocate the piston connected to the swash plate. The drive shaft (16) transmits the rotational force supplied from the motor (M) to the swash plate, and the outside A gas guide for sucking and discharging gas from the gas guide, a case head for supplying the sucked gas into the cylinder and selectively evacuating the compressed gas according to the pressure of the first to fourth compression tanks T1 to T4; A valve plate for supplying gas into the rotating cylinder fixed to the inner side of the cylinder and exhausting the compressed gas, a cylinder block for compressing the gas with a plurality of pistons built therein, and rotational force of the drive shaft 16 in a linear reciprocating motion. It consists of a swivel plate to convert.

The gas guide has an intake pipe and an exhaust pipe. The exhaust pipe is connected to the pipe P1 of the first compression tank T1, and a check valve is provided inside the exhaust pipe to prevent the gas stored in the compression tank from flowing back toward the compressor. It is built in.

The case head sucks the gas supplied from the gas guide into six bores provided in the cylinder block, and acts as a passage for selectively discharging the compressed gas in the bore. The gas moving passage serving as the passage serves as a suction passage. It is divided into exhaust passage.

The valve plate is in close contact with the cylinder head so that the cylinder head rotates in this direction and slides. On the upper surface of the valve plate, the intake valve groove and the exhaust valve groove are dug in an arc shape.

Therefore, the gas flowing into the suction valve groove of the valve plate through the suction passage of the case head is sucked into each cylinder bore, gradually compressed as the cylinder block rotates, and then the exhaust valve groove of the valve plate according to the pressure of the compression tank. It is selectively discharged through.

The six cylinder bores provided in the cylinder block are drilled in a direction parallel to the drive shaft, and a piston is slidably inserted into each cylinder bore.

These cylinder blocks are connected to the swash plate and the universal coupling along the rotation axis centerline of each part. In addition, the swash plate is rotatably coupled to the driven shaft fixed to the inclined surface of the case end plate, and the six pistons inserted into the cylinder bore are rotatably fastened to the swash plate by respective piston rods. .

This configuration of the bent axis compressor (C) is capable of quiet operation and maximize energy efficiency, compared to the conventional bent axis compressor, there is an effect such as no-load operation and durability can be improved.

Hereinafter, the operation of the gas compression system according to the present invention will be described.

When the motor M is driven and the rotary shaft 12 is rotated, the rotational force of the rotary shaft 12 is driven by the pulley 34, the idle pulleys 38 and 40, and the belts 44 and 44 ′. It is transmitted to the pulley 36, wherein the rotational force of the rotary shaft 12 is decelerated at a constant reduction ratio and then transmitted to the drive shaft 16.

In the above, the reduction ratio of the drive shaft 16 is possible by appropriately designing the diameter of the idle pulley.

When the drive shaft 16 starts to rotate in a decelerated state at a constant reduction ratio, the cylinder head and cylinder block integrally coupled with the drive shaft 16 are rotated together with the drive shaft 16 and at the same time the swash plate coupled with the cylinder block is When rotated and the swash plate is rotated while swinging in a direction inclined with respect to the drive shaft 16, each piston rod coupled to the swash plate is selectively compressed exhaust stroke while performing a linear reciprocating motion in the direction of the drive shaft.

Accordingly, when the high temperature compressor body compressed by the compressor C is discharged to the first compression tank T1 through the pipe P1, the compressor body introduced into the compression tank T1 is then second and third. 3 After passing sequentially through the compression tank (T2, T3) is stored in the fourth compression tank (T4). As described above, when the compressor body sequentially passes through the first to fourth compression tanks T1 to T4, the temperature of the compressor body gradually decreases as described above (t1 → t2 → t3 → t4), and the fourth In the compression tank (T4) is maintained at a temperature close to room temperature to minimize the absolute humidity contained in the compressor body. That is, the moisture content contained in the compressor body is minimized.

Water accumulated at the bottom of the compression tank is removed by opening the water discharge valve.

The cooling fan 14 fixed to the end of the rotary shaft 12 while the motor M is driven rotates integrally with the rotary shaft 12 to blow cooling air toward the compressor C, and the cooling Since air is guided toward the compressor C by the protective cover 32, the cooling effect of the compressor C is increased by the cooling air.

In the above, the gas compression system of the present invention has been described as an example having two pairs of compression tanks, but the present invention is not limited thereto.

That is, the present invention can also be installed in series so as to face the motor and the compressor via the anti-vibration rubber between the pair of compression tanks.

Of course, in this case, the power transmission unit for transmitting the driving force of the motor to the compressor may be provided on one side of the compression tank.

In the above description, the compressor for compressing the gas has been described as an example of a bent axis compressor, but a reciprocating compressor may also be used.

As described above, in the gas compression system of the present invention, since the first to fourth compression tanks are sequentially connected by pipes, the moisture content of the gas discharged from the fourth compression tank is minimized to maximize the dehumidifying effect.

In addition, since the compressor, the motor, the compression tank, the idle pulley assembly and the tension control member are indirectly fastened, respectively, vibration noise caused by driving of the motor, the compressor, and the belt can be effectively suppressed.

In addition, the idle pulley assembly and the tension control member is installed in the space formed by the first to fourth compression tanks, the pressure switch instrument assembly and the air discharge instrument assembly is the second and third compression tank and the fourth and fourth 1 Since it is installed in the plate member installed in the space between the compression tank, it is possible to implement a compact (compact) and simple (simple) design.

In addition, the motor and the compressor face each other, the cooling fan is fixed to the end of the rotating shaft of the motor adjacent to the compressor, the driving force of the motor is decelerated by the idle pulley assembly without passing through a separate reduction gear to the compressor Since it is transmitted, the cooling effect of the compressor is maximized by the cooling fan, and there is an effect of removing a separate reduction gear.

Claims (8)

A compressor (C) for compressing the gas; A motor (M) having a cooling fan (14) at an end portion of the rotating shaft (12) and providing a driving force for driving the compressor (C); The high temperature compressor body discharged from the compressor (C) is connected by piping so as to pass sequentially, and composed of a pair of two adjacently arranged in parallel in the width direction, the upper side of the interspace formed by the parallel arrangement At least two cylindrical compression tanks in which the compressor (C) and the motor (M) are installed in series with the cooling fan (14) of the motor (M) facing the compressor (C); A power transmission unit configured to transfer the driving force of the motor to the drive shaft of the compressor in a state in which the rotational force of the motor shaft is decelerated; Gas compression system comprising a. According to claim 1, wherein the other pair of compression tanks are arranged in the longitudinally extended position of the pair of compression tanks, each compression tank is four compression tanks (T1 to T) connected in series in a clockwise or counterclockwise direction. T4). The anti-vibration rubber (18, 18 ', 20, 20) according to claim 2, wherein the motor (M) and the compressor (C) are seated between the compression tanks (T1 and T2, T3 and T4) arranged in parallel in the width direction. ') Is installed, the anti-vibration rubber is installed through the connecting rod 26, the one end is fixed to the bracket 24 provided in the motor (M) and the compressor (C), tightened at the other end of the connecting rod (26) Gas compression system, characterized in that the nut (30) is fixed. The method of claim 3, wherein the power transmission unit, An idler pulley assembly 70 including a shaft 42 having idle pulleys 38 and 40 at both ends, and a shaft housing 42 'supporting the shaft 42 via a bearing 46; ; Belts 44 and 44 'connecting the idle pulleys 38 and 40 to respective pulleys 34 and 36 provided on the rotary shaft 12 of the motor M and the drive shaft 16 of the compressor C. and; A tension adjusting member 72 including a tension plate 48 for supporting the idle pulley assembly 70 in a downward direction, and a tension adjusting bolt 54 for adjusting a position of the tension plate 48; Gas compression system, characterized in that consisting of. The gas compression system according to claim 4, wherein the idle pulley assembly (70) is disposed in a space formed between two pairs of compression tanks. 5. The tension plate (48) according to claim 4, wherein one of the tension plates (48) is in contact with the pipe at a lower side of the pipe (P5) connecting the first and fourth compression tanks (T1, T4) in the longitudinally extending position. The other side is in contact with the end of the tension adjustment bolt 54 through the bracket 52 fixed to the pipe (P3) connecting the second and third compression tank (T2, T3) in the longitudinally extending position. And a portion of the lower surface of the tension plate (48) is in contact with the upper surface of the shaft housing (42 '). The cooling fan 14 and the pulleys according to any one of claims 1 to 6, wherein the cooling fan 14 and the pulley 34 of the motor M and the pulley 36 of the compressor C are outside. A gas compression system, characterized in that a protective cover (32) surrounding (34,36) is provided. The pressure switch gauge substrate assembly 64 is installed in the plate member 68 installed in the space between the second and third compression tanks T2 and T3 adjacent in the longitudinal direction. And a plate member (68 ') installed in the space between the first and fourth compression tanks (T1, T4) adjacent in the longitudinal direction.