JP2003322084A - Discharging part structure for aftercooler drain in compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharging part structure for an aftercooler in a compressor capable of making exhaust noise at the time of discharging aftercooler drain quiet and discharging drain to the outside of the compressor without freezing drain. <P>SOLUTION: One end of a bypass circuit 60 is communicated with a primary side of the aftercooler 20 and the other end 62 is communicated with a drain circuit 50 communicated with a lower end of a drain collecting part 33 of a drain separator 30. A silencer 54 mounted on the drain circuit 50 is stored into an elastic cover 100 having sound absorbing property and heat insulating property. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aftercooler drain structure in a compressor, and more specifically,
In a compressor equipped with an aftercooler, the aftercooler drain discharge part structure that silences or reduces the sound emitted when the drain generated in the aftercooler is discharged through a throttle and prevents the drain discharge part from freezing. Regarding

[0002]

2. Description of the Related Art A compressor 1 shown in FIG. 6 is provided with a so-called "oil cooling type" compressor body 2 which uses oil for lubricating, sealing and cooling a compression working space. Two
A separator receiver tank 3 for introducing compressed gas discharged together with cooling oil and separating the compressed gas into cooling oil and compressed gas is provided.

The compressed gas separated from the cooling oil in the separator receiver tank 3 is supplied to the consumer side via the service valve 40 after the cooling oil is further separated and removed via the oil separator 10. It is configured so that the compressed oil degreased can be used.

In such a compressor 1, when the consumer side is required to supply a dry compressed gas, the compressed gas that has passed through the oil separator 10 is introduced into the aftercooler 20, and the aftercooler 20 converts the compressed gas. When cooled, the water vapor in the compressed gas is condensed to generate a drain, which is separated by the drain separator 30 and collected.

The drain separator 30 has a chamber 33 serving as a drain collecting section for collecting the drain separated from the compressed gas in a lower space thereof, and the chamber 3 serving as the drain collecting section 3
A drain circuit 50 is connected to the lower end of 3, and the drain collected in the drain collecting section is discharged as a mixed fluid together with a part of the compressed gas in the drain collecting section from a drain discharge port 56 to, for example, a soundproof box. Meanwhile, the drain separator 30
The dry compressed gas from which the drain has been separated is supplied to the consumer side via the service valve 40.

[0006]

In the compressor 1 having the aftercooler 20 described above, the drain separator 3 is used.
A drain circuit 50 for discharging the drain separated by 0
The drain discharge port 56 is provided in the drain discharge port 56. Since the compressed gas in the drain separator cooled by passing through the aftercooler 20 together with the drain is also discharged from the drain discharge port 56, the drain discharge port 56 is provided. The flow rate of the compressed gas discharged from the drain discharge port 56 is controlled by, for example, providing the throttle 53 at the upstream side of the drain discharge port 56.
6 is configured to prevent unlimited release of the compressed gas and prevent the amount of compressed gas supplied to the consumer side from decreasing.

In the present specification, the term "throttle" generally means a passage having a smaller flow passage area than the upstream flow passage area for the purpose of adjusting the flow rate and pressure of the fluid flowing in the circuit. , A cock, a valve and the like having a variable flow passage area, and a small-diameter plug, an orifice and the like having a fixed flow passage area are included.

Since the compressed gas is discharged together with the drain from the drain discharge port 56 in this way, the exhaust noise at the time of the discharge is large and the noise during the operation of the compressor is significant.

In order to prevent this noise, a muffler may be attached to the drain discharge port to reduce the exhaust noise. However, when the muffler is arranged outside the soundproof box, the muffler is better than the soundproof box. Since it protrudes, it hinders the movement and installation of the compressor. In addition, there is a risk that the muffler may collide with an object or the like placed around it when it is moved or transported, resulting in damage or the like.

Further, since the silencer has a complicated structure due to the structure in which a sound absorbing material, a baffle plate for sound insulation and the like are arranged inside, the drain and the compressed gas introduced into the silencer are complicated. It is difficult for the mixed fluid consisting of and to escape, and the compressed gas in the mixed fluid expands rapidly at the exit of the silencer, so that the ambient temperature of the silencer decreases, and When used in an environment of 10 ° C or lower, the drain freezes in the silencer, and the drain outlet 56
The muffler installed outside the soundproof box that is always exposed to the outside air may cause such freezing, and when the outside temperature is below freezing, the sound is silenced regardless of the expansion of the compressed gas. The drain is cooled in the container and freezes.

In this way, when the drain discharge port 56 is closed and the drain cannot be discharged, the drain separator 3
The drain separated by 0 is supplied to the consumer side together with the compressed gas, and the significance of providing the aftercooler 20 and the drain separator 30 is lost.

In order to prevent the freezing of the drain inside the muffler, it is possible to provide a heater on the muffler to heat the muffler, but the device structure becomes complicated and the number of parts increases. Manufacturing / assembling becomes complicated, and manufacturing cost increases.

It is also conceivable to arrange a silencer inside the soundproof box as a solution to the above-mentioned problem. In this case, in order to discharge the drain discharged from the silencer outside the soundproof box, Since the discharge port of the muffler is arranged toward the opening provided in the soundproof box, it is necessary to use a muffler whose exhaust direction is specified in one direction. However, in this type of silencer, the muffling effect is inferior to that of a muffler in which exhaust directions are multi-directional, and in order to improve the muffling effect, it is necessary to increase the size of the muffler. It becomes difficult to secure a space for arranging the silencer inside.

On the other hand, the use of a muffler of the type that exhausts air in multiple directions can improve the muffling effect. In this case, however, the drain discharged from the muffler has an opening formed in the soundproof box. Can not be led out of the soundproof box via
Drain will scatter in the soundproof box, and various devices housed in the soundproof box will be soiled.

When the air in the soundproof box is discharged by a fan or the like in order to introduce cooling air for cooling equipment such as a motor, an engine, a compressor body, etc., which is a drive source, the inside of the soundproof box is Negative pressure occurs, and as described above, when an opening is provided in the soundproof box located in front of the muffler in the discharge direction, outside air is introduced into the soundproof box through this opening, and drain discharged from the muffler toward the opening. Even if a silencer whose exhaust direction is specified to be one direction is used, it may flow back into the soundproof box together with the outside air and may contaminate the equipment housed in the soundproof box. There may be a problem of splashing of drain.

As a structure for preventing freezing of the drain discharge part, in a compressor equipped with an aftercooler, when a certain amount of separated drain is accumulated, the auto drain device for discharging the accumulated drain by the action of the float is frozen. As a configuration for preventing this, a device is disclosed that blows air on the inlet side of an aftercooler from the outside to the throttle part of the auto drain device and heats the throttle part of the auto drain device from the outside to prevent freezing of the auto drain device itself. The microfilm of Jitsugan Sho 59-173809 (Shokai Sho 61
-88077)]].

When an automatic drain device for discharging the drain by the action of the float is provided like the compressor shown in Japanese Utility Model Laid-Open No. 61-88077, compressed gas is supplied to the drain discharged by the automatic drain device. Since it is scarcely included, unlike the aftercooler drain discharge part of the compressor 1 shown in FIG. 4 described above, the problem of noise generation due to discharge of compressed gas does not occur, and when the drain is discharged. The problem of freezing of the drain due to expansion of the compressed gas is not caused.

On the other hand, in the aftercooler drain discharge section of the compressor shown in FIG. 6, the frozen drain is throttled because the mixed fluid of drain and compressed gas always passes through the throttle 53. Although the problem of blocking the air is unlikely to occur, since the drain is always accumulated in the auto drain device of Japanese Utility Model Laid-Open No. 61-88077, when the temperature falls below freezing, the auto drain device The drainage freezes in the squeezed part and the drainage cannot be discharged. Therefore, in order to prevent the malfunction of the auto drain device due to such freezing, the above-mentioned anti-freezing device is provided.

As described above, the compressor in Japanese Utility Model Laid-Open No. 61-88077 is completely different from the compressor shown in FIG. 6 in the structure of the aftercooler drain discharge section. Even if the throttle 53 provided in the aftercooler drain discharge part of the compressor shown in FIG. 6 is heated from the outside by the anti-freezing device of -88077, noise at the time of discharging the aftercooler drain cannot be reduced, Further, it is impossible to prevent the drain discharge port from freezing.

As described above, in the circuit configuration of the compressor having the basic configuration shown in FIG. 6, there is no drain discharge structure that simultaneously satisfies the requirements of high noise reduction effect and drain freeze prevention.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks in the prior art, and the aftercooled drain is discharged as a mixed fluid together with a part of the compressed gas in the drain separator. In the structure of the aftercooler drain discharge part of the machine, even if a muffler is provided in the discharge part and this muffler is placed in the soundproof box, the drain is not scattered in the soundproof box and the structure is relatively simple. An after-cooler for a compressor that can muffle or reduce exhaust noise when discharging aftercooler drain, and can drain the drain removed through the aftercooler and the drain separator to the outside of the machine without freezing. By providing a cooler drain discharge structure, the operating noise is quiet, and even when used below freezing There without freezing, thus aims to prevent the drain from being mixed into the compressed gas supplied to the consumer side by the discharge failure of the drain.

[0022]

In order to achieve the above object, the aftercoola drain discharge part structure in the compressor of the present invention introduces the compressed gas discharged from the compressor body 2 and introduces it. An aftercooler 20 that cools the compressed gas to condense the water vapor in the compressed gas to generate drainage.
And the drain generated in the aftercooler 20 is separated,
The drain separator 30 for collecting is provided, and the compressed gas in which the drain is separated by the drain separator 30 is supplied to the consumer side, and is separated from the compressed gas by the drain separator 30. In the compressor 1 which discharges the drain collected in a certain chamber 33 through the throttle 53, one end 51 is connected to the chamber 33 which is the drain collecting section, and the other end 52 is arranged in the soundproof box 4. Drain circuit 5 opened through the silencer 54
0, one end 61 communicates with the primary side of the aftercooler 20, and the other end 62 communicates with the drain circuit 50 upstream of the muffler 54, and a bypass circuit 60 is provided.
4 is surrounded by a cover 100 having an opening 103 (claim 1).

The cover 100 is preferably made of a material having a low thermal conductivity such as rubber or other resin (claim 2).

The cover 100 may be made of rubber,
The insertion port 102 is formed of another elastic material such as a resin, and the drain circuit (drain pipe) 50 to which the silencer 54 is attached is fitted to the insertion port 102. The drain circuit (drain pipe) 50 may be attached so that a gap is formed between the outer periphery of the drain circuit (drain pipe) 50 and the inner periphery of the insertion port 102 (claim 3).

The formation position of the opening 103 of the cover 100 may be configured to project outside the soundproof box 4 through a communication port 42 formed in the soundproof box 4 (claim 4).

The cover 10 is provided on the inner wall of the soundproof box 4.
0 is provided with a fixing portion for closing and fixing the opening 103, and the fixing portion located inside the opening 103 of the cover 100 communicates the space inside the cover 100 and the outside of the soundproof box 4. The drain outlet 104 may be formed (Claim 5).

As an example, the fixing portion is composed of a partition plate 108 which is a plate-like member in which a cylindrical flange 109 is formed so as to project from one surface, and the partition plate 1 is provided on the inner wall of the soundproof box 4.
The surface of 08 of the flange 109 opposite to the protruding surface of the flange 109 may be attached so as to face it, and the opening 103 of the cover 100 may be externally fitted to the flange of the partition plate 108 (claim 6).

In this case, it is preferable that a heat insulating material 112 made of, for example, a rubber plate is sandwiched between the partition plate 108 and the inner wall of the soundproof box 4 (claim 7).

A sound absorbing material 107 made of, for example, urethane resin may be attached to the inner or outer circumference of each cover 100 described above (claim 8).

Further, a drain tank 110 for collecting the drain discharged from the cover 100 may be provided inside or outside the soundproof box 4 (claim 9).
A conduit 105 such as a rubber hose may be provided to convey the drain discharged from 00 to the drain tank 110 (claim 10).

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that in the following embodiments, an example in which the present invention is applied to the compressor 1 using an oil-cooled compressor body as the compressor body 2 will be described. Of the so-called "oil-free screw compressor" in addition to the one using the oil-cooled compressor body 2 shown in FIG.
The present invention can be applied to those using the compressor body 2 that does not use cooling oil for sealing and cooling the compression action space such as the above, and other compressors including the aftercooler 20 can be applied to various compressors. You can

When used in a compressor of a type that does not use cooling oil, the compressed gas in the receiver tank 3 is directly introduced into the aftercooler 20 without using the oil separator 10 or the compressor is used. The compressed gas discharged from the main body 2 may be directly introduced into the aftercooler 20, and in the oil-cooled compressor described above, the separation performance of the cooling oil in the separator receiver tank and the compressed gas required on the consumption side are also required. Depending on the allowable oil content and the like, the compressed gas in the separator receiver tank may be directly introduced into the aftercooler.

The aftercooler 20 used in the compressor 1 to which the present invention is applied is not limited to any type as long as it can cool compressed gas, and various known types such as water-cooling type, air-cooling type and freezing type are known. Aftercoolers can be used.

[Overall Structure] First, the overall structure of the discharge part of the aftercooler drain of the present invention will be described with reference to FIG.

FIG. 1 shows a service valve 40 for supplying compressed gas from an oil separator 10 whose inlet is communicated with a separator receiver tank (not shown) to an air working machine or the like.
The circuit configuration up to this point is shown. The oil separator 1
0, the outlet 12 of the aftercooler 20 communicates with the outlet 12, and the outlet 22 of the aftercooler 20 communicates with the inlet 31 of the drain separator 30.
The compressed gas that has passed through is introduced into the drain separator 30 and is condensed by cooling by the aftercooler 20, and the generated drain is separated and collected by the drain separator 30.

The outlet 32 of the drain separator 30
Is connected to the service valve 40, and the dry compressed gas from which water vapor has been removed by the drain separator 30 can be supplied from the service valve 40.

The drain separator 30 described above has a chamber 33, which is a drain collecting portion, formed in the lower portion thereof.
The drain separated from the compressed gas is collected in the space 3. The drain collected in the chamber 33 of the drain separator 30 is discharged through the drain circuit 50 having one end 51 connected to the bottom of the drain separator 30.

The drain circuit 50 is provided with a throttle 53 in the circuit, and the flow rate of the compressed gas discharged together with the drain is controlled via the drain circuit 50.

As shown in FIG. 1, when the inlet of the drain separator 30 is arranged above the outlet 22 of the aftercooler 20, the drain is introduced into the circuit 80 between the outlet 22 of the aftercooler 20 and the inlet 31 of the drain separator 30. If necessary, one end 71 is communicated with the outlet 22 of the aftercooler 20, and the other end 72 is connected with the branch circuit 70 upstream of the throttle 53 to the drain circuit 50. The drain may be combined with the drain circuit 50 and discharged. However,
The branch circuit 70 may be provided only when necessary, such as when the drain separator 30 is arranged at a higher position than the aftercooler 20, and is not always necessary.

When the branch circuit 70 is provided in this manner, it is preferable to prevent the drain introduced into the branch circuit 70 from flowing back to the drain separator 30 side through the drain circuit 50, for example. A throttle 73 and other backflow preventing means are provided in the branch circuit 70.

In the piping structure of the aftercooler drain discharge part constructed as described above, a silencer 54 is attached to the other end 52 of the drain circuit 50, and the silencer 54 is introduced into the drain circuit 50. A bypass circuit 60 for introducing the compressed gas upstream of the aftercooler 20 is provided at one end 61 while the mixed fluid of the drain and the compressed gas is discharged, and the other end 62 of the bypass circuit 60 is connected to the drain circuit 50. By communicating with each other, the warm compressed gas before passing through the aftercooler 20 can be introduced into the drain circuit 50.

In the embodiment shown in FIG. 1, one end 61 of the bypass circuit 60 communicates with the outlet of the oil separator 10, but in the configuration of FIG. After passing, before passing through the aftercooler 20 (exit 2 of the aftercooler 20
As long as it is possible to introduce the compressed gas (before reaching No. 2), the one end 61 may be connected to a position in the middle of the circuit 90 or in the middle of the aftercooler 20.

The other end of the bypass circuit 60 is connected to the diaphragm 53.
In the embodiment shown in FIG. 1 that communicates with the drain circuit 50 downstream of the bypass circuit 60, the bypass circuit 60 also has a diaphragm 63.
Is provided to control the flow rate of the compressed gas introduced into the drain circuit 50 via the bypass circuit 60, and the amount of the compressed gas fed from the oil separator 10 to the aftercooler 20 is excessively reduced while controlling the flow rate of the compressed gas. Is being prevented.

The other end 62 of the bypass circuit 60 does not necessarily need to communicate with the drain circuit 50 downstream of the diaphragm 53. However, the compressed gas from the bypass circuit 60 merges after passing through the throttle 53 with respect to the mixed fluid in which the pressure of the exhaust gas from the exhaust port is increased by passing through the throttle 53 and rapidly decreasing to atmospheric pressure. By doing so, the drain circuit 50 is provided downstream of the diaphragm 53.
The pressure in the inside can be increased, and a gradual pressure drop occurs from the throttle 53 to the exhaust port.
Since the compressed gas that has passed through and the compressed gas from the bypass circuit 60 collide with each other, the flowing direction of the combined compressed gas can be changed to collide with the inner wall surface of the drain circuit to reduce the flow velocity, so that the aftercooler drain is discharged. The exhaust noise at the time can be reduced.

When the other end 62 of the bypass circuit 60 is connected to the drain circuit 50 on the upstream side of the diaphragm 53, the bypass circuit 60 does not necessarily have to be provided with a diaphragm. Further, the diaphragm provided in the bypass circuit 60 may be a variable diaphragm such as a valve instead of being fixed.

The type of the silencer 54 attached to the drain circuit is not particularly limited, but since it is arranged in a restricted space in the soundproof box, the silencer 54 having a small size and a high silencing effect should be used. Is preferred. In the present embodiment, the "omnidirectional" silencer 54, which has a higher muffling effect than the silencer 54 in which the discharge direction is one direction and is exhausted in all circumferential directions, is used. However, it does not preclude the use of a muffler that discharges in one direction.

The muffler 54 covers the outer periphery of the muffler 100.
The silencer 54 is configured to discharge the gas-liquid mixed fluid of the compressed gas and the drain inside the cover 100. The drain discharged in the cover 100 in this way is provided in the opening 10 provided in the cover 100.
It is configured to be discharged to the outside of the soundproof box 4 via 3 or to be collected in the soundproof box 4 or the drain tank 110 arranged outside the soundproof box 4 via, for example, the conduit 105.

[Cover] The cover 100 described above may have any shape and structure as long as it can surround the silencer 54 and does not scatter the drain inside the soundproof box 4. Is preferably made of rubber, plastic, other resin, or other material having low thermal conductivity and elasticity.

In the present embodiment, the upper end opening of the cover 100 having a substantially cylindrical shape is narrowed narrower than the central portion, and the cover 100 has a muffler 54 at the upper end as shown in FIGS.
And an insertion port 102 for inserting the drain circuit (drain pipe) 50 to which the silencer 54 is attached,
At the bottom end, a discharge port 1 for discharging drain inside
An opening 103 in which 04 is formed is formed, and by fitting the insertion opening 102 of the cover 100 to the drain pipe 50 (drain circuit) to which the silencer 54 is attached,
The silencer 54 is mounted so as to be surrounded.

The cover 100 may have a structure in which all of the cover 100 is arranged in the soundproof box 4 as shown in FIG. 4, and the soundproof box 4 as shown in FIGS. 2, 3 and 5. A part of the soundproof box 4 may be projected from the communication port 42 provided in the.

Although not shown, the cover 100 and the drain tank are arranged in the soundproof box 4 without providing the above-mentioned communication port 42 in the soundproof box 4, and the drain discharged from the cover 100 is directly supplied to the drain tank. Drip or soundproof box 4
It may be configured to be introduced through a conduit 105 or the like provided inside.

Further, in the illustrated example, the insertion port 102 is located at the upper end and the opening 103 is located at the lower end located on the central axis of the cover.
However, the cover 100 may change the mounting direction of the silencer 54 in accordance with changes in the mounting position and angle of the silencer 54, and the drain discharged from the silencer 54 can be removed from the soundproof box. It can be collected without scattering in 4,
In addition, if the collected drain can be discharged from the opening 103, the drain 103 may be arranged laterally with respect to the illustrated example, and the insertion opening 102 and the opening 103 may not be arranged on the central axis line. , May be arranged at an angle with respect to the central axis.

FIG. 2 shows an example of the structure of the above-mentioned cover 100. As an example, the both end openings of a cylindrical body made of rubber having a cylindrical shape in the central portion are narrowed down as compared with the central portion, An opening located above is formed as an insertion opening 102 for fitting the drain pipe 50 outside, and an opening 103 arranged below.
One end of an insertion port 106 having a hollow structure for connecting a conduit 105 to be described later is inserted therein, and a drain discharge port 104 is formed in the hollow portion of the insertion port 106. Then, the other end of the insertion port 106 is inserted into the conduit 105 made of a rubber hose or the like so that the drain collected in the cover 100 can be conveyed to the drain tank 110.

At least a portion of the cover 100 where the above-mentioned opening 103 is formed, in the embodiment shown in FIG. 2, about 1/3 of the lower portion of the cover 100 is inserted into the communication port 42 formed in the soundproof box 4. Then, it is projected outside the soundproof box 4.

Preferably, the communication port 4 formed in the soundproof box 4
2 is formed to have the same or slightly smaller outer diameter than the central portion of the cover 100, and the cover 100 made of an elastic material is press-fit into the communication port 42, the restoring force of the cover 100 causes the communication port 42 and the cover It is possible to mount the two in a state in which they are in close contact with each other without forming a gap with 100, and for example, even when the air in the soundproof box 4 is discharged to the outside of the soundproof box 4 via a cooling fan, Communication port 4
2 through the gap between the cover 100 and the outside air
It is possible to prevent the drain inside the cover 100 from being cooled by the introduction of the outside air. Further, it is possible to prevent the drain discharged from the muffler 54 from flowing back into the soundproof box 4 together with the outside air through the gap between the communication port 42 and the cover 100.

Further, by forming the cover 100 and the communication port 42 in the size described above, the mounting position of the cover 100 is fixed by contact with the communication port 42, and
Since the cover 100 expanded by the introduction of the mixed fluid is more firmly locked in the communication port 42, even if the pressure in the cover 100 rises, the cover 100 is detached from the drain pipe 50 and communicated. It is prevented from jumping out of the soundproof box 4 through the mouth 42.

The insertion port 102 of the cover 100 fitted on the other end 52 of the drain pipe 50 is formed to have an inner diameter substantially the same as the outer diameter of the drain pipe 50.
When the pressure inside 0 is not increased, it is in close contact with the outer periphery of the drain pipe 50. However, when the pressure inside the cover 100 is excessively increased, for example, when clogging due to freezing of the drain occurs, this As the internal pressure increases, the cover 100 elastically deforms to form a gap between the insertion opening 102 and the outer circumference of the drain pipe 50, and compressed gas leaks from this portion to prevent the cover from bursting or breaking.

[Operation] The operation of the aftercooler drain discharge portion structure of the present invention having the above-described structure will be described. The compressed gas from the receiver tank 3 has its oil content removed through the oil separator 10, Aftercooler 2
0 and cooled, and then introduced via a service valve 40 to a consumer side such as an air working machine (not shown). In the drain separator 30 provided between the aftercooler 20 and the service valve 40, the aftercooler 2 is installed.
Drain generated during cooling by 0 is collected, and dried compressed gas is supplied through the service valve 40.

The drain collected in the drain separator 30 is accumulated in the chamber 33 which constitutes the drain collecting portion of the drain separator 30, and the drain accumulated in this chamber 33 is connected to the other end 52 of the drain circuit 50. It is discharged as a mixed fluid with the compressed gas through the silencer 54.

At this time, a bypass circuit 60 communicating with the primary side of the aftercooler 20 is communicated with the drain circuit 50 upstream of the muffler 54, and the drain circuit 50 is conveyed as a mixed fluid with the compressed gas in the drain circuit 50. After being mixed with warm compressed gas on the primary side of the aftercooler 20 and warmed, it is introduced into the silencer 54, so that the drain is prevented from freezing in the silencer 54.

The drain and the compressed gas thus warmed are discharged through the silencer 54 into the cover 100 made of a material having excellent sound absorbing and heat insulating properties.
Exhaust noise is reduced due to the synergistic effect with the silencer 54.
The mixed fluid discharged into the cover 100 is also difficult to be cooled. Therefore, the mixed fluid discharged from the muffler 54 is not cooled rapidly even when the outside air temperature is relatively low, and the drain is frozen in the cover 100 and clogging is less likely to occur.

The drain thus discharged into the cover 100 as the mixed fluid is discharged to the outside of the cover 100 through the discharge port 104 formed in the opening 103.

When a large amount of mixed fluid is discharged into the cover 100 at one time, or the drain is frozen in the conduit 105 connected to the discharge port 104 of the cover 100, the pressure in the cover 100 is excessively increased. Even in this case, the cover 100 formed of the elastic material as described above
The cover deforms in response to this increase in pressure, creates a gap between the insertion port 102 and the outer periphery of the drain pipe 50, and releases the compressed gas from this gap, so that the cover is prevented from bursting or breaking.

The drain discharged into the cover 100 in the above-described manner causes the pressure in the cover 100 to cause the conduit 105 to drain.
It is transported inside and collected in the drain tank 110.

By surrounding the muffler 54 with the cover 100 in this way, a high muffling effect is exhibited in combination with the muffling effect of the muffler 54, and when the muffler 54 is arranged in the soundproof box 4. Even if it is, it is possible to reliably prevent the drain from scattering in the soundproof box 4. Therefore, it is possible to use an omnidirectional silencer having a high silencing effect as the silencer 54, and to achieve a high silencing effect. The silencer can be placed in a small space within the soundproof box while maintaining it.

The space inside the cover 100 has a silencer 5
Aftercooler 2 merged with drain upstream of 4
Since the cover 100 is warmed by the warm compressed gas before passing through 0 and the cover 100 is made of a material having low heat conductivity such as rubber, the space inside the cover 100 is hard to be cooled by the outside air. Therefore, silencer 5
It is also possible to prevent the drain from freezing in the nozzle 4 and causing clogging.

[Structural Example 2 of Cover] FIG. 3 shows still another structural example of the cover 100 used in the structure of the aftercooler drain discharge portion of the present invention.
The cover 100 has the same configuration as that of the cover 100 shown in FIG. 2 except that a sound absorbing material 107 such as urethane resin is provided therein.

In this way, the sound absorbing material 10 is placed inside the cover 100.
By providing 7, the sound deadening effect can be further improved by the synergistic effect of the sound deadening device 54 and the sound absorbing material 107.

[Structural Example 3 of Cover] FIG. 4 shows still another structural example of the cover 100 used in the structure of the aftercoola drain discharge portion of the present invention.

In the embodiment shown in FIGS. 2 and 3,
Although both ends of the substantially cylindrical cover made of an elastic material are narrowed to be narrower than the central portion, in the present embodiment, only the end portion on the insertion port 102 side is the central portion. The opening 103 has a narrowed shape by comparison, and the other has an opening 103 having the same diameter as the central portion.

Then, the lower end of the cover forming the opening 103 is fixed in position by a fixing portion formed on the inner wall of the soundproof box 4, and the cover 1 is also changed by the pressure change in the cover 100.
00 is prevented from moving.

As an example of the structure of the fixing portion for fixing the mounting position of the cover 100, that is, the lower end position in the illustrated example, a cylindrical flange 109 protruding from the inner wall of the soundproof box 4 is provided to cover the cover 100. The flange 109 is inserted into the opening 103 to fix the lower end of the cover 100 to the inner wall of the soundproof box 4. And this flange 109
Drain outlet 1 that penetrates the wall of soundproof box 4 inside
To form 04.

The above-mentioned flange 109 can be formed by directly attaching it to the inner wall surface of the soundproof box 4, but in the present embodiment, a drain is provided in the center in consideration of the convenience of repair and replacement. A partition plate 108, in which a cylindrical flange 109 concentric with the discharge port 104 is formed to project, is separately prepared on one surface of a plate body having an opening to serve as the discharge port 104, and the partition plate 108 is attached to the soundproof box 4. The flange 109 is projected from the inner wall of the soundproof box 4 by being attached to the inner wall of the above, and this serves as a fixed portion.

When the partition plate 108 is attached, the soundproof box 4 is placed in correspondence with the position of the discharge port 104 described above.
The communication port 42 is formed on the wall surface of the exhaust port 104, which is located on the inner periphery of the flange 109 and communicates with the space inside the cover 100.
Are formed in the soundproof box 4.

In addition, the partition plate 108 is directly connected to the insertion port 106 communicating with the discharge port 104, or a socket 106 'for mounting the insertion port is provided on the partition plate on the side opposite to the projecting surface of the flange 109. It may be attached via this socket 106 ′ by attaching it to the surface of 108.

A rubber plate or other heat insulating material 112 is preferably sandwiched between the partition plate 108 and the inner wall of the soundproof box 4. By sandwiching the heat insulating material 112 in this manner, the opening 103 side of the cover 100 is provided. Therefore, the air in the cover 100 is prevented from being cooled.

However, the partition plate 108 itself may be formed of a material having excellent heat insulating properties such as a resin material. In this case, a heat insulating material 112 such as a rubber plate is not necessarily provided between the partition plate 108 and the inner wall of the soundproof box 4. There is no need to pinch.

The partition plate 108 configured as described above is
The socket 1 described above is provided in the communication port 42 formed in the soundproof box 4.
Soundproof box 4 with 06 'and the insertion port 106 inserted
It is fixed to the inner wall of the machine by bolts, etc.

Then, the flange 109 protruding from the partition plate 108 is inserted into the opening 103 of the cover 100, and the cover 100 and the flange 109 are simultaneously tightened from the outer periphery of the cover 100 with a fastener or the like. The lower end of 100 is fixed to the inner wall of the soundproof box 4.

As described above, in the cover 100 whose lower end is fixed to the inner wall of the soundproof box 4, the cover 100
Even if the internal pressure rises, the lower end position of the cover 100 is fixed without moving. Therefore, in the embodiment shown in FIG. 2, the communication port 4 formed in the soundproof box 4
Although there is a risk of jumping out of the soundproof box 4 from 2, it is possible to completely prevent such an inconvenience.

[Structure Example 4 of Cover] In the embodiment shown in FIGS. 2 to 4, the structure in which the drain discharged from the cover 100 is conveyed to the drain tank 110 via the conduit 105 such as a rubber hose. The cover 10
It is not always necessary to provide a conduit 105 such as a rubber hose at 0. For example, as shown in FIG. 5, the drain may be directly dropped into the drain tank 110 arranged below the cover 100.

[0082]

According to the configuration of the present invention described above, the warm compressed gas before being introduced into the aftercooler via the bypass circuit joins the mixed fluid of drain and compressed gas discharged via the drain circuit. Since the mixed fluid cooled by the aftercooler is heated and discharged, even if the compressed gas expands rapidly at the discharge port of the muffler, the muffler is not cooled to below freezing and The drain doesn't freeze.

Further, since the drain collected in the drain collecting part of the drain separator is constantly flowing in the drain circuit together with the compressed gas, the automatic drain device of Japanese Utility Model Publication No. 61-88077 introduced as the prior art. There is no place where drainage collects, and even if it is used in an environment below freezing, drainage is unlikely to freeze.

Therefore, it is possible to prevent the drain from being defectively discharged due to the silencer being blocked by the frozen drain, and to prevent the drain from being mixed into the compressed gas discharged from the service valve.

Since the muffler is arranged in the cover, a high muffling effect is exhibited in combination with the muffling effect of the muffler, and the muffler is arranged in the soundproof box. There is no risk of drainage scattering in the sound box. Therefore, various types of silencers can be used.

Further, since the muffler is warmed without being exposed to the outside air due to the exhaust of the muffler discharged into the cover, not only the drain does not easily freeze in the muffler, but also the heat insulating property of the cover is improved. By using a superior material, the drain is unlikely to freeze in the cover.

Further, since the drain collected by the cover can be easily collected in the drain tank, it is possible to easily collect the drain containing oil and the like which leads to environmental pollution. It was possible to provide a drain discharge structure with consideration.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a piping configuration of an aftercooler drain discharge section showing an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a cover used in the present invention.

FIG. 3 is a schematic sectional view of another cover used in the present invention.

FIG. 4 is a schematic sectional view of yet another cover used in the present invention.

FIG. 5 is a schematic explanatory view showing an arrangement relationship between a cover and a drain tank.

FIG. 6 is a circuit diagram showing a conventional aftercooler drain discharge structure.

[Explanation of symbols]

1 compressor 2 Compressor body 3 Separator receiver tank 4 soundproof boxes 10 Oil separator 12 outlets (of oil separator) 20 Aftercooler 21 entrance (aftercooler) 22 Exit (of aftercooler) 30 drain separator 31 Inlet (for drain separator) 32 outlet (of drain separator) 33 rooms (drain collection part) 40 service valve 42 communication port 50 drain circuit 51 One end (of drain circuit) 52 The other end (of the drain circuit) 53 aperture 54 silencer 56 outlet 60 Bypass circuit 61 One end (of bypass circuit) 62 other end (of bypass circuit) 63 aperture 64 on-off valve 70 branch circuits 71 One end (branch circuit) 72 other end (of branch circuit) 73 Aperture 80 circuits (between aftercooler and drain separator) 90 circuits (between oil separator and aftercooler) 100 cover 102 insertion slot 103 opening 104 outlet 105 conduit 106 outlet 106 'socket (in slot) 107 sound absorbing material 108 Partition plate 109 flange 110 drain tank 112 insulation

Claims (10)

[Claims] 1. An aftercooler for introducing a compressed gas discharged from a compressor body, cooling the introduced compressed gas to condense water vapor in the compressed gas to generate drain,
A drain separator for separating and collecting the drain generated in the aftercooler is provided, and the compressed gas in which the drain is separated by the drain separator is supplied to the consuming side, and is separated from the compressed gas by the drain separator, and the drain separator is provided. In a compressor that discharges the drain collected in the drain collection part of the drain through a throttle, one end communicates with the drain collection part and the other end is opened through a silencer arranged in a soundproof box. A bypass circuit having one end communicating with the primary side of the aftercooler and the other end communicating with the drain circuit upstream of the silencer is provided, and the silencer is surrounded by a cover having an opening. Aftercooled drain discharge structure characterized by. 2. The drain discharge structure of a compressor according to claim 1, wherein the cover is made of a material having a low thermal conductivity. 3. The cover is made of an elastic material, and
It has an insertion port for externally fitting the drain circuit to which the silencer is attached, and is attached so that a gap is created between the outer periphery of the drain circuit and the inner periphery of the insertion port due to elastic deformation due to an increase in internal pressure of the cover. The aftercooler drain discharge part structure in the compressor according to Item 1 or 2. 4. The discharge of aftercooler drain in the compressor according to any one of claims 1 to 3, wherein a communication port projecting outside of the soundproof box is formed in the soundproof box at a position where the opening of the cover is formed. Part structure. 5. An inner wall of the soundproof box is provided with a fixing portion for closing and fixing the opening of the cover, and the fixing portion positioned on the inner circumference of the opening of the cover,
The aftercooler drain discharge part structure in a compressor according to any one of claims 1 to 3, wherein a drain discharge port that communicates a space inside the cover and the outside of the soundproof box is formed. 6. The fixing portion is composed of a partition plate which is a plate-shaped body in which a tubular flange is formed so as to project from one surface, and the inner wall of the soundproof box is opposite to the flange projecting surface of the partition plate. 6. The after-cooler drain discharge part structure in a compressor according to claim 5, wherein the surfaces of the cover are attached so as to face each other, and the opening of the cover is externally fitted to the flange of the partition plate. 7. The aftercooler drain discharge structure in a compressor according to claim 6, wherein a heat insulating material is sandwiched between the partition plate and the inner wall of the soundproof box. 8. A structure for discharging aftercooler drain in a compressor according to claim 1, wherein a sound absorbing material is attached to the cover. 9. The aftercooler drain discharge part structure in a compressor according to claim 1, further comprising a drain tank for collecting drain discharged from the cover. 10. The aftercooler drain discharge structure of a compressor according to claim 9, further comprising a conduit for transporting the drain discharged from the cover to the drain tank.