JP3734454B2 - Aftercool drain drain structure in a compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for discharging an aftercooler drain in a compressor, and more specifically, in a compressor equipped with an aftercooler, muffles or reduces noise when discharging the drain generated in the aftercooler through a throttle. In addition, the present invention relates to an aftercooler drain discharge portion structure that prevents the drain discharge portion from freezing.
[0002]
[Prior art]
A compressor 1 shown in FIG. 6 includes a so-called “oil-cooled” compressor body 2 that uses oil for lubrication, sealing, and cooling of a compression working space. A separator receiver tank 3 for introducing the discharged compressed gas and separating it into cooling oil and compressed gas is provided.
[0003]
The compressed gas separated from the cooling oil in the separator receiver tank 3 is supplied to the consumption side via the service valve 40 after the cooling oil is further separated and removed via the oil separator 10 to remove the oil. It is comprised so that the compressed gas made can be used.
[0004]
In such a compressor 1, when supply of dry compressed gas is required on the consumption side, the compressed gas that has passed through the oil separator 10 is introduced into the aftercooler 20, and the compressed gas is cooled in the aftercooler 20. Water vapor in the compressed gas is condensed to generate drain, and the drain is separated and collected by the drain separator 30.
[0005]
The drain separator 30 has a chamber 33 as a drain collecting portion for collecting drain separated from the compressed gas in a lower space thereof, and a drain circuit 50 is connected to a lower end of the chamber 33 as the drain collecting portion. Then, the drain collected in the drain collecting part is discharged as a mixed fluid together with a part of the compressed gas in the drain collecting part from the drain discharge port 56 to, for example, a soundproof box, while the drain is discharged in the drain separator 30. The dried compressed gas from which the gas is separated is supplied to the consumption side through the service valve 40.
[0006]
[Problems to be solved by the invention]
In the compressor 1 provided with the aftercooler 20 described above, a drain discharge port 56 is provided in the drain circuit 50 in order to discharge the drain separated by the drain separator 30. A part of the compressed gas in the drain separator that has been cooled by passing through the aftercooler 20 together with the drain is also discharged, and thus is discharged from the drain discharge port 56 by providing a throttle 53 upstream of the drain discharge port 56. The flow rate of the compressed gas is controlled to prevent the compressed gas from being released from the drain discharge port 56 without any limitation, and the amount of the compressed gas supplied to the consumption side can be prevented from decreasing.
[0007]
In the present specification, “throttle” refers to all of those having a flow area smaller than the flow area on the upstream side for the purpose of adjusting the flow rate and pressure of fluid flowing in the circuit, Any of those having a variable flow path area such as a valve and those having a fixed flow path area such as a small diameter plug or an orifice are included.
[0008]
Since the compressed gas is discharged from the drain outlet 56 together with the drain in this way, the exhaust noise during the discharge is large and the noise during the operation of the compressor is significant.
[0009]
In order to prevent this noise, it may be possible to reduce the exhaust noise by installing a silencer at the drain outlet, but when the silencer is placed outside the soundproof box, the silencer protrudes from the soundproof box. Therefore, it becomes an obstacle when moving or installing the compressor. In addition, there is a risk that the silencer may collide with an object or the like disposed around when moving, transporting, etc., causing damage.
[0010]
Furthermore, since the silencer has a complicated structure due to its internal structure, such as a sound absorbing material and a baffle for sound insulation, it is composed of drain and compressed gas introduced into the silencer. The mixed fluid is difficult to escape, and the compressed gas in the mixed fluid suddenly expands when it exits the silencer outlet, so that the ambient temperature of the silencer decreases, for example, the outside air temperature is 10 ° C. or less. If the silencer is installed outside the soundproof box, the drain may freeze in the silencer and the drain outlet 56 may be blocked with ice. When the outside air temperature is below freezing, the drain is cooled and frozen in the silencer regardless of the expansion of the compressed gas.
[0011]
As described above, when the drain discharge port 56 is blocked and the drain is not discharged, the drain separated by the drain separator 30 is supplied to the consumption side together with the compressed gas, and the aftercooler 20 and the drain separator 30 are provided. The significance is lost.
[0012]
In order to prevent the drain from freezing in the silencer, it may be possible to heat the silencer with a heater. However, the structure of the apparatus becomes complicated, and the number of parts increases, so that it can be manufactured and assembled. Becomes complicated, and the manufacturing cost increases.
[0013]
As a solution to the above-mentioned problem, it is conceivable to arrange a silencer in the soundproof box. In this case, in order to discharge the drain discharged from the silencer to the outside of the soundproof box, Since the discharge port is arranged toward the opening provided in the soundproof box, it is necessary to use a silencer whose exhaust direction is specified in one direction. However, this type of silencer is inferior to the silencer with multiple exhaust directions, so if you want to improve the silencer, you need to increase the size of the silencer. It is difficult to secure a space for placing the silencer inside.
[0014]
On the other hand, the use of a silencer of a type that exhausts in multiple directions can improve the silencing effect, but in this case the drain discharged from the silencer is prevented through an opening formed in the soundproof box. Since it cannot be guided out of the sound box, the drain is scattered in the soundproof box, and various devices housed in the soundproof box are soiled.
[0015]
In addition, in order to introduce cooling air for cooling equipment such as the motor, engine, and compressor body that are the drive source, when the air in the soundproof box is exhausted by a fan or the like, the pressure inside the soundproof box becomes negative. As described above, when an opening is provided in the soundproof box located in front of the silencer in the discharge direction, outside air is introduced into the soundproof box from this opening, and the drain discharged from the silencer toward the opening is prevented together with the outside air. Even if a silencer with the exhaust direction specified in one direction is used for the scale, there is a risk of backflowing into the sound box and contaminating the equipment housed in the soundproof box. The problem of scattering may occur.
[0016]
As a configuration for preventing the drain discharge portion from freezing, the auto drain device that discharges the accumulated drain due to the action of the float in a compressor equipped with an aftercooler when a certain amount of separated drain accumulates is intended to prevent freezing. In order to prevent the auto drain device itself from freezing, air on the inlet side of the aftercooler is blown from the outside to the throttle portion of the auto drain device, and the throttle portion of the auto drain device is heated from the outside. [Microfilm of Japanese Utility Model No. 59-173809 (Japanese Utility Model Publication No. 61-88077)].
[0017]
In the case of providing an auto drain device that discharges drainage by the action of a float, such as the compressor shown in Japanese Utility Model Publication No. 61-88077, the drain gas discharged by the auto drain device contains almost all compressed gas. Therefore, unlike the aftercooler drain discharge portion of the compressor 1 shown in FIG. 4 described above, there is no problem of noise generation due to the discharge of the compressed gas, and the compressed gas when the drain is discharged The problem of freezing of the drain due to the expansion of the liquid does not occur.
[0018]
On the other hand, in the aftercooler drain discharge portion of the compressor shown in FIG. 6, since the fluid mixture of drain and compressed gas always passes through the throttle 53, the frozen drain closes the throttle 53. However, since the drain is always accumulated in the auto drain device of Japanese Utility Model Publication No. 61-88077, the auto drain device is throttled when the temperature falls below freezing point. The drain freezes at the part and the drain cannot be discharged. Therefore, in order to prevent such malfunction of the auto drain device due to freezing, the above-described anti-freezing device is provided.
[0019]
Thus, the compressor in Japanese Utility Model Laid-Open No. 61-88077 differs from the compressor shown in FIG. 6 in the configuration of its aftercool drain discharge section. Even if the throttle 53 provided in the aftercooler drain discharge portion of the compressor shown in FIG. 6 is heated from the outside by the antifreezing device of FIG. 6, the noise during the discharge of the aftercooler drain cannot be reduced. It is not possible to prevent the outlet from freezing.
[0020]
Thus, in the circuit configuration of the compressor having the basic configuration shown in FIG. 6, there is no drain discharge portion structure that satisfies the requirements of a high silencing effect and drain freezing at the same time.
[0021]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described drawbacks of the prior art, and is an after-type compressor that discharges aftercool drain as a mixed fluid together with a part of the compressed gas in the drain separator. In the cooler drain discharge part structure, a silencer is provided in the discharge part, and even if this silencer is disposed in the soundproof box, the aftercooler drain has a relatively simple structure without scattering the drain in the soundproof box. The exhaust noise when discharging the exhaust air, and the drain removed through the after cooler and the drain separator can be discharged outside the apparatus without freezing. By providing a drain structure, the operation sound is quiet and the drain freezes even if used below freezing point And without therefore an object of the invention to prevent the drain from being mixed into the compressed gas supplied to the consumer side by the discharge failure of the drain.
[0022]
[Means for Solving the Problems]
In order to achieve the above object, the aftercool drain drain discharge structure in the compressor of the present invention introduces the compressed gas discharged from the compressor body 2 and cools the introduced compressed gas in the compressed gas. An aftercooler 20 that condenses water vapor to generate drain and a drain separator 30 that separates and collects the drain generated in the aftercooler 20, and the compressed gas from which the drain has been separated by the drain separator 30 is supplied to the consumption side In the compressor 1 for supplying and discharging the drain separated from the compressed gas by the drain separator 30 and collected in the chamber 33 which is a drain collecting part of the drain separator 30 through the throttle 53,
A drain circuit 50 having one end 51 communicated with the chamber 33 serving as the drain collecting portion and the other end 52 opened via a silencer 54 disposed in the soundproof box 4;
A bypass circuit 60 having one end 61 communicating with the primary side of the aftercooler 20 and the other end 62 communicating with the drain circuit 50 upstream of the silencer 54;
The silencer 54 is surrounded by a cover 100 having an opening 103 (Claim 1).
[0023]
The above-described cover 100 is preferably formed of a material having low thermal conductivity, such as rubber or other resin.
[0024]
Further, the cover 100 is formed of an elastic material made of, for example, rubber or other resin, and the insertion port 102 for fitting the drain circuit (drain pipe) 50 to which the silencer 54 is attached is formed. A configuration may be adopted in which a gap is formed between the outer periphery of the drain circuit (drain pipe) 50 and the inner periphery of the insertion port 102 due to elastic deformation accompanying an increase in the internal pressure of the cover 100 (Claim 3).
[0025]
The formation position of the opening 103 of the cover 100 may be configured to protrude out of the soundproof box 4 through a communication port 42 formed in the soundproof box 4 (Claim 4).
[0026]
Further, a fixing portion for closing and fixing the opening 103 of the cover 100 is provided on the inner wall of the soundproof box 4, and the fixing portion located on the inner periphery of the opening 103 of the cover 100 is provided in the cover 100. You may form the drain discharge port 104 which connects space and the said soundproof box 4 exterior.
[0027]
As an example, the fixing portion includes a partition plate 108 which is a plate-like body in which a cylindrical flange 109 is formed to protrude from one side.
A configuration in which the surface of the partition plate 108 opposite to the protruding surface of the flange 109 is attached to the inner wall of the soundproof box 4 and the opening 103 of the cover 100 is externally fitted to the flange of the partition plate 108. (Claim 6).
[0028]
In this case, it is preferable to sandwich a heat insulating material 112 made of, for example, a rubber plate between the partition plate 108 and the inner wall of the soundproof box 4 (Claim 7).
[0029]
A sound absorbing material 107 made of, for example, urethane resin may be attached to each of the above-described covers 100 on the inner periphery or outer periphery (claim 8).
[0030]
Furthermore, a drain tank 110 for collecting drain discharged from the cover 100 may be provided inside the soundproof box 4 or outside the soundproof box 4 (Claim 9).
You may provide the conduit | pipe 105, such as a rubber hose, for conveying the drain discharged | emitted from the said cover 100 to the said drain tank 110 (Claim 10).
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, in the following embodiment, although the example applied to the compressor 1 which uses the oil-cooled compressor main body as the compressor main body 2 is demonstrated, the compressor 1 to which this invention is applied is the above-mentioned. In addition to those using the oil-cooled compressor body 2 shown in FIG. 6 described in the prior art, a compressor body that does not use cooling oil for sealing and cooling a compression working space such as a so-called “oil-free screw compressor” 2 can be applied, and any other compressor provided with the aftercooler 20 can be applied to various compressors.
[0032]
Thus, when using for the type of compressor which 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 from the compressor body 2. The discharged compressed gas may be directly introduced into the aftercooler 20, and also in the above-described oil-cooled compressor, the separation performance of the cooling oil in the separator receiver tank and the oil content in the compressed gas required on the consumption side. Depending on the allowable amount or the like, the compressed gas in the separator receiver tank may be directly introduced into the aftercooler.
[0033]
The aftercooler 20 used in the compressor 1 to which the present invention is applied may be any of various types of water-cooled, air-cooled, and refrigeration-type aftercoolers as long as the compressed gas can be cooled. Can be used.
[0034]
[Overall structure]
First, the whole structure of the discharge part of the aftercooler drain of this invention is demonstrated with reference to FIG.
[0035]
FIG. 1 shows a circuit configuration from an oil separator 10 connected to a separator receiver tank whose inlet is not shown to a service valve 40 for supplying compressed gas to an air working machine or the like. 12, the inlet 21 of the aftercooler 20 is communicated, and the outlet 22 of the aftercooler 20 is communicated with the inlet 31 of the drain separator 30, and the compressed gas that has passed through the aftercooler 20 is introduced into the drain separator 30, and the aftercooler 20 The drain that is condensed by cooling is separated and collected by the drain separator 30.
[0036]
The outlet 32 of the drain separator 30 communicates with the service valve 40 so that dry compressed gas from which water vapor has been removed by the drain separator 30 can be supplied from the service valve 40.
[0037]
The drain separator 30 described above is formed with a chamber 33 as a drain collecting portion in the lower portion thereof, and the drain separated from the compressed gas is collected in the chamber 33. The drain collected in the chamber 33 of the drain separator 30 is discharged through a drain circuit 50 having one end 51 connected to the bottom of the drain separator 30.
[0038]
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 through the drain circuit 50 is controlled.
[0039]
As shown in FIG. 1, when the inlet of the drain separator 30 is disposed above the outlet 22 of the aftercooler 20, the drain may accumulate in the circuit 80 between the outlet 22 of the aftercooler 20 and the inlet 31 of the drain separator 30. Therefore, if necessary, one end 71 is communicated with the outlet 22 of the aftercooler 20, and the other end 72 is provided with a branch circuit 70 communicating with the drain circuit 50 upstream of the throttle 53. The drain circuit 50 may be joined and discharged. However, this branch circuit 70 may be provided only when necessary, such as when the drain separator 30 is disposed at a higher position than the aftercooler 20, and is not necessarily required.
[0040]
In the case where the branch circuit 70 is provided in this way, for example, a throttle 73 for preventing the drain introduced into the branch circuit 70 from flowing back to the drain separator 30 side through the drain circuit 50. Other backflow prevention means are provided in the branch circuit 70.
[0041]
In the piping configuration of the outlet portion of the aftercooler drain configured as described above, a silencer 54 is attached to the other end 52 of the drain circuit 50, and the drain and the compression introduced into the drain circuit 50 through the silencer 54 are compressed. In addition to being configured to discharge a fluid mixture with gas, a bypass circuit 60 for introducing compressed gas upstream of the aftercooler 20 is provided at one end 61, and the other end 62 of the bypass circuit 60 is connected to the drain circuit 50. The warm compressed gas before passing through the aftercooler 20 can be introduced into the drain circuit 50.
[0042]
In the embodiment shown in FIG. 1, one end 61 of the bypass circuit 60 is communicated with the outlet of the oil separator 10, but in the configuration of FIG. 1, the bypass circuit 60 passes through the oil separator 10. If the compressed gas before passing through the aftercooler 20 (before reaching the outlet 22 of the aftercooler 20) can be introduced, the end 61 is communicated with a position in the middle of the circuit 90 or in the middle of the aftercooler 20. There may be.
[0043]
In the embodiment shown in FIG. 1 in which the other end of the bypass circuit 60 is communicated with the drain circuit 50 downstream of the restrictor 53, the restrictor 63 is also provided in the bypass circuit 60, and the drain circuit is connected via the bypass circuit 60. In addition to controlling the flow rate of the compressed gas introduced into 50, the amount of compressed gas fed from the oil separator 10 to the aftercooler 20 is prevented from excessively decreasing.
[0044]
The other end 62 of the bypass circuit 60 does not necessarily need to communicate with the drain circuit 50 downstream of the throttle 53. However, after passing through the throttle 53, the compressed gas from the bypass circuit 60 is merged after passing through the throttle 53 with respect to the mixed fluid that makes the exhaust noise from the exhaust port loud by dropping the pressure to the atmospheric pressure suddenly. By doing so, the pressure in the drain circuit 50 can be increased downstream of the throttle 53, causing a gradual pressure drop between the throttle 53 and the exhaust port, and the compressed gas that has passed through the throttle 53 and Compressed gas from the bypass circuit 60 collides, and the flow 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, thus reducing exhaust noise when discharging the aftercooler drain can do.
[0045]
When the other end 62 of the bypass circuit 60 is connected to the drain circuit 50 on the upstream side of the throttle 53, it is not always necessary to provide the throttle in the bypass circuit 60. The diaphragm provided in the bypass circuit 60 is not fixed and may be a variable diaphragm such as a valve.
[0046]
The type of the silencer 54 attached to the drain circuit is not particularly limited. However, since the silencer 54 is disposed in a limited space in the soundproof box, it is preferable to use a silencer 54 that is small and has a high silencing effect. In the present embodiment, an “omnidirectional type” silencer 54 is used which has a higher silencing effect than the silencer 54 in which the discharge direction is one direction and exhausts in the entire circumferential direction. However, this does not exclude the use of a silencer that discharges in one direction.
[0047]
The outer periphery of the silencer 54 is surrounded by a cover 100, and the silencer 54 is configured to discharge a gas-liquid mixed fluid of compressed gas and drain in the cover 100. The drain discharged in the cover 100 in this manner is discharged out of the soundproof box 4 through the opening 103 provided in the cover 100, or a drain tank 110 disposed in the soundproof box 4 or outside the soundproof box 4. For example, it is configured to be collected through a conduit 105.
[0048]
〔cover〕
The cover 100 may have any shape and structure as long as the cover 100 can surround the silencer 54 and the drain does not scatter in the soundproof box 4, but is preferably rubber, plastic, or the like. It is preferable that the resin is made of a material having low thermal conductivity and elasticity.
[0049]
In the present embodiment, the upper end opening of the substantially cylindrical cover 100 is narrowed narrower than the center portion, and the cover 100 has a silencer 54 and the silencer at the upper end as shown in FIGS. An insertion port 102 for inserting a drain circuit (drain pipe) 50 to which 54 is attached is formed, and an opening 103 in which a discharge port 104 for discharging the drain is formed is formed at the lower end portion. The silencer 54 is attached so as to be surrounded by externally fitting the insertion port 102 of the cover 100 to a drain pipe 50 (drain circuit) to which the silencer 54 is attached.
[0050]
The cover 100 may have a structure in which all of the cover 100 is disposed in the soundproof box 4 as shown in FIG. 4, and is provided in the soundproof box 4 as shown in FIGS. 2, 3, and 5. A part of the soundproof box 4 may protrude from the communication port 42.
[0051]
Although illustration is omitted, the cover 100 and the drain tank are arranged in the soundproof box 4 without providing the communication port 42 in the soundproof box 4, and the drain discharged from the cover 100 is directly dropped onto the drain tank, Or you may comprise so that it may introduce | transduce through the conduit | pipe 105 etc. which were piped in the soundproof box 4. FIG.
[0052]
Furthermore, in the illustrated example, the insertion port 102 is formed at the upper end portion and the opening 103 is formed at the lower end portion on the center axis line of the cover. However, the mounting position and angle of the silencer 54 are changed along with other changes. The cover 100 may be mounted in a different direction, so that the drain discharged from the silencer 54 can be collected without being scattered in the soundproof box 4, and the collected drain can be removed from the opening 103 described above. If it can be discharged, it may be disposed sideways with respect to the illustrated example, and the insertion port 102 and the opening 103 may be disposed at an angle with respect to the central axis without being disposed on the central axis. good.
[0053]
FIG. 2 shows an example of the structure of the cover 100 described above. As an example, the opening at both ends of a cylindrical body made of rubber having a cylindrical shape at the center is narrowed compared to the center and positioned above. The opening to be formed is an insertion port 102 for fitting the drain pipe 50, and one end of the insertion port 106 having a hollow structure for connecting a conduit 105 to be described later is inserted into the opening 103 disposed below, A drain discharge port 104 is formed in the hollow portion of the insertion port 106. The other end of the insertion port 106 is inserted into a 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.
[0054]
In the embodiment shown in FIG. 2, at least the portion where the opening 103 is formed in the cover 100, about 1/3 below the cover 100 is inserted into the communication port 42 formed in the soundproof box 4, It protrudes outside the soundproof box 4.
[0055]
Preferably, the communication port 42 formed in the soundproof box 4 is formed to have the same diameter as or slightly smaller than the outer diameter of the central portion of the cover 100, and the cover 100 formed of an elastic material is press-fitted into the communication port 42. With the restoring force of the cover 100, the communication port 42 and the cover 100 can be attached in close contact with each other without any gap between them. For example, the air in the soundproof box 4 can be removed from the soundproof box 4 via a cooling fan. Even if it is discharged to the outside, it is possible to prevent the outside air from being introduced into the soundproof box 4 through the gap between the communication port 42 and the cover 100. By introducing this outside air, the drain inside the cover 100 can be prevented. Can be prevented from being cooled. Furthermore, it is possible to prevent the drain discharged from the silencer 54 from flowing back into the soundproof box 4 through the gap between the communication port 42 and the cover 100 together with the outside air.
[0056]
Further, by forming the cover 100 and the communication port 42 in the above-described sizes, the attachment position of the cover 100 is fixed by contact with the communication port 42, and the cover 100 expanded by the introduction of the mixed fluid is more robust. Since it is locked in the communication port 42, even when the pressure in the cover 100 rises, the cover 100 is prevented from coming off the drain pipe 50 and jumping out of the soundproof box 4 through the communication port 42. To do.
[0057]
The insertion port 102 of the cover 100 fitted to 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, and the pressure in the cover 100 is not increased. In some cases, the cover 100 is in close contact with the outer periphery of the drain pipe 50. However, when the pressure in the cover 100 increases excessively, for example, when clogging or the like occurs due to freezing of the drain, the cover 100 is accompanied by the increase in internal pressure. Is elastically deformed to form a gap between the insertion port 102 and the outer periphery of the drain pipe 50, and the compressed gas is leaked from this portion to prevent the cover from being ruptured or broken.
[0058]
[Action]
The operation of the aftercooler drain discharge part structure of the present invention having the above-described configuration will be described. The compressed gas from the receiver tank 3 is introduced into the aftercooler 20 after the oil is removed through the oil separator 10. It is cooled and then introduced into the consumption side of an air working machine (not shown) via the service valve 40, but is generated when cooling by the aftercooler 20 in the drain separator 30 provided between the aftercooler 20 and the service valve 40. The collected drain is collected, and dried compressed gas is supplied through the service valve 40.
[0059]
The drain collected in the drain separator 30 is accumulated in a chamber 33 that forms a drain collecting portion of the drain separator 30, and the drain accumulated in the chamber 33 is a silencer 54 connected to the other end 52 of the drain circuit 50. Is released as a fluid mixture with compressed gas.
[0060]
At this time, a bypass circuit 60 communicating with the primary side of the aftercooler 20 is connected to the drain circuit 50 upstream of the silencer 54, and the drain conveyed in the drain circuit 50 as a mixed fluid with the compressed gas is the aftercooler 20. Since it joins with the warm compressed gas in the primary side and is warmed, it introduce | transduces in the silencer 54, Therefore It is prevented that a drain freezes in the silencer 54. FIG.
[0061]
The drain and the compressed gas warmed in this way are discharged through the silencer 54 into the cover 100 made of a material excellent in sound absorption and heat insulation, and thus exhausted by a synergistic effect with the silencer 54. The sound is reduced, and the mixed fluid discharged into the cover 100 is hardly cooled. Therefore, the mixed fluid discharged from the silencer 54 is not rapidly cooled even when the outside air temperature is relatively low, and the drain is frozen in the cover 100 and is not likely to be clogged.
[0062]
Then, the drain discharged into the cover 100 as a mixed fluid in this way is discharged out of the cover 100 through the discharge port 104 formed in the opening 103.
[0063]
This is the case when a large amount of mixed fluid is discharged into the cover 100 at one time, or when the pressure in the cover 100 rises excessively due to freezing of the drain in the conduit 105 connected to the discharge port 104 of the cover 100. However, as described above, the cover 100 formed of an elastic material is deformed in response to the pressure increase, and a gap is formed between the insertion port 102 and the outer periphery of the drain pipe 50, and the compressed gas is released from the gap. The cover is prevented from being ruptured or damaged.
[0064]
The drain discharged into the cover 100 as described above is transported in the conduit 105 by the pressure in the cover 100 and collected in the drain tank 110.
[0065]
By surrounding the silencer 54 with the cover 100 in this way, a high silencing effect is exhibited in combination with the silencing effect by the silencer 54, and the silencer 54 is disposed in the soundproof box 4. Also, it is possible to reliably prevent the drain from scattering in the soundproof box 4, and therefore, it is possible to use an omnidirectional silencer having a high silencing effect as the silencer 54, while maintaining a high silencing effect. The silencer can be placed in a small space in the soundproof box.
[0066]
The space in the cover 100 is warmed by the warm compressed gas that has joined the drain upstream of the silencer 54 and before passing through the aftercooler 20, and the cover 100 is formed of a material having low thermal conductivity such as rubber. As a result, the space in the cover 100 has a structure that is difficult to be cooled by the outside air, so that it is possible to prevent the drain from freezing in the silencer 54 and causing clogging or the like.
[0067]
[Configuration example 2 of the cover]
FIG. 3 is still another structural example of the above-described cover 100 used in the aftercool drain drain discharge structure of the present invention, except that a sound absorbing material 107 such as urethane resin is provided in the cover 100. The configuration is the same as that of the cover 100 shown in FIG.
[0068]
As described above, by providing the sound absorbing material 107 in the cover 100, it is possible to further improve the silencing effect due to the synergistic effect of the silencer 54 and the sound absorbing material 107.
[0069]
[Configuration example 3 of the cover]
FIG. 4 shows still another configuration example of the above-described cover 100 used in the aftercooler drain discharge portion structure of the present invention.
[0070]
In the embodiment shown in FIGS. 2 and 3, both ends of the substantially cylindrical cover made of an elastic material have a shape narrowed narrower than the central portion. In this case, only the end portion on the insertion opening 102 side is formed in a narrowed shape as compared with the central portion, and the other is the opening 103 having the same diameter as that of the central portion.
[0071]
The position of the lower end of the cover forming the opening 103 is fixed at a fixing portion formed on the inner wall of the soundproof box 4 so that the cover 100 is prevented from moving or the like due to a pressure change in the cover 100.
[0072]
As an example of the structure of the fixing portion for fixing the mounting position of the cover 100, in the illustrated example, the lower end position, a cylindrical flange 109 protruding from the inner wall of the soundproof box 4 is provided, and the inside of the opening 103 of the cover 100 is provided. This flange 109 is inserted to fix the lower end of the cover 100 to the inner wall of the soundproof box 4. A drain discharge port 104 that penetrates the wall surface of the soundproof box 4 is formed in the flange 109.
[0073]
The flange 109 can be formed by directly attaching the flange 109 to the inner wall surface of the soundproof box 4, but in the present embodiment, the drain outlet 104 is provided at the center in consideration of convenience such as repair and replacement. A partition plate 108 in which a cylindrical flange 109 concentric with the discharge port 104 is formed on one side of a plate body having an opening is separately prepared, and the partition plate 108 is provided on the inner wall of the soundproof box 4. By attaching, the flange 109 protrudes from the inner wall of the soundproof box 4, and this is used as a fixed portion.
[0074]
When the partition plate 108 is attached, the communication port 42 is formed in the wall surface of the soundproof box 4 corresponding to the position of the discharge port 104 described above, and the space in the cover 100 is located on the inner periphery of the flange 109. A discharge port 104 communicating with the soundproof box 4 is formed in the soundproof box 4.
[0075]
It should be noted that the partition plate 108 has an insertion port 106 communicating with the discharge port 104 directly or a socket 106 ′ for mounting the insertion port on the surface of the partition plate 108 opposite to the protruding surface of the flange 109. It may be attached via the socket 106 ′ by attaching to the socket.
[0076]
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, and the heat insulating material 112 is thus sandwiched from the opening 103 side of the cover 100. The inside air is prevented from being cooled.
[0077]
However, the partition plate 108 itself may be formed of a material having excellent heat insulation properties such as a resin material. In this case, a heat insulating material 112 such as a rubber plate is necessarily sandwiched between the partition plate 108 and the inner wall of the soundproof box 4. There is no need.
[0078]
The partition plate 108 configured as described above is bolted to the inner wall of the soundproof box 4 in a state where the socket 106 ′ and the insertion port 106 are inserted into the communication port 42 formed in the soundproof box 4. Fixed.
[0079]
When 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, for example, a fastener, the lower end of the cover 100 Is fixed to the inner wall of the soundproof box 4.
[0080]
Thus, in the cover 100 whose lower end is fixed to the inner wall of the soundproof box 4, the lower end position of the cover 100 is fixed without moving even when the pressure in the cover 100 rises. . Therefore, in the embodiment shown in FIG. 2, there is a risk of jumping out of the soundproof box 4 from the communication port 42 formed in the soundproof box 4, but it is possible to completely prevent such inconvenience from occurring. .
[0081]
[Cover Configuration Example 4]
In the embodiment shown in FIGS. 2 to 4, the configuration 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 is shown. The conduit 105 such as a rubber hose is not necessarily provided. For example, as shown in FIG. 5, the drain may be directly dropped into the drain tank 110 disposed below the cover 100.
[0082]
【The invention's effect】
According to the configuration of the present invention described above, the warm compressed gas before being introduced into the aftercooler via the bypass circuit is joined to the mixed fluid of the drain and the compressed gas discharged via the drain circuit, and the aftercooler Since the cooled mixed fluid is warmed and discharged, even if the compressed gas expands rapidly at the discharge port of the silencer, the silencer is not cooled to below freezing point, and the drain does not freeze in the silencer. .
[0083]
In addition, since the drain collected in the drain collecting part of the drain separator is always flowing in the drain circuit together with the compressed gas, like the automatic drain device of Japanese Utility Model Publication No. 61-88077 introduced as the prior art. The drain does not accumulate, and the drain is not easily frozen even if it is used in an environment below the freezing point.
[0084]
Therefore, it is possible to prevent the drainage of the drain caused by 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.
[0085]
Along with the configuration in which the silencer is arranged in the cover, it exhibits a high silencing effect coupled with the silencing effect by the silencer, and the silencer is arranged in the soundproof box while being arranged in the soundproof box. There is no risk of drain splashing. Therefore, various types of silencers can be used.
[0086]
In addition, since the silencer is heated without being exposed to the outside air due to the exhaust of the silencer exhausted into the cover, not only is the drain freezing in the silencer, it also has excellent heat insulating properties as a cover. By using the material, it is difficult for the drain to freeze in the cover.
[0087]
Also, 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 etc. that leads to environmental pollution. It was possible to provide the structure of the drain discharge part.
[Brief description of the drawings]
FIG. 1 is a circuit diagram illustrating a piping configuration of an aftercooler drain discharge unit according to an embodiment of the present invention.
FIG. 2 is a schematic sectional view of a cover used in the present invention.
FIG. 3 is a schematic cross-sectional view of another cover used in the present invention.
FIG. 4 is a schematic cross-sectional view of still 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 aftercool drain drain discharge structure.
[Explanation of symbols]
1 Compressor
2 Compressor body
3 Separator receiver tank
4 Soundproof box
10 Oil separator
12 Outlet (of oil separator)
20 Aftercooler
21 Entrance (aftercooler)
22 Exit (aftercooler)
30 Drain separator
31 Inlet (Drain separator)
32 Exit (Drain separator)
Room 33 (Drain collector)
40 Service valve
42 communication port
50 Drain circuit
51 One end (of drain circuit)
52 Other end (of drain circuit)
53 Aperture
54 Silencer
56 outlet
60 Bypass circuit
61 One end (bypass circuit)
62 Other end (bypass circuit)
63 Aperture
64 On-off valve
70 branch circuit
71 One end (for branch circuit)
72 The other end (branch circuit)
73 Aperture
80 circuit (between aftercooler and drain separator)
90 circuit (between oil separator and aftercooler)
100 cover
102 insertion slot
103 opening
104 outlet
105 conduit
106 outlet
106 'socket (for outlet)
107 Sound absorbing material
108 divider
109 flange
110 Drain tank
112 Thermal insulation

Claims (10)

The compressed gas discharged from the compressor body is introduced, the introduced compressed gas is cooled, the water vapor in the compressed gas is condensed to generate drain, and the drain generated by the aftercooler is separated and trapped. A drain separator that collects and supplies compressed gas from which drain has been separated by the drain separator to the consumption side, and is separated from the compressed gas by the drain separator and collected in a drain collecting portion of the drain separator. In a compressor that discharges through a throttle,
A drain circuit having one end communicated with the drain collecting portion and the other end opened via a silencer disposed in a soundproof box;
Providing 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;
An aftercooler drain discharging part structure in which the silencer is surrounded by a cover having an opening. The drain discharge part structure in the compressor according to claim 1, wherein the cover is made of a material having low thermal conductivity. The cover is made of an elastic material, and has an insertion port for fitting the drain circuit to which the silencer is attached. The aftercooler drain discharging part structure in the compressor according to claim 1 or 2, wherein the aftercooling drain is attached so as to form a gap. The discharge part structure of the aftercooler drain in the compressor of any one of Claims 1-3 which formed the communicating port which protrudes the said position of the said opening of the said cover outside the said soundproof box in the said soundproof box. On the inner wall of the soundproof box, provided with a fixing portion for closing and fixing the opening of the cover,
The compressor according to any one of claims 1 to 3, wherein a drain discharge port that communicates the space in the cover and the outside of the soundproof box is formed in the fixed portion located on the inner periphery of the opening of the cover. Aftercool drain drain discharge structure. The fixing portion is composed of a partition plate that is a plate-like body formed by projecting a cylindrical flange from one side,
The compressor according to claim 5, wherein a surface of the partition plate opposite to the flange projecting surface is attached to an inner wall of the soundproof box so as to face the flange, and an opening of the cover is externally fitted to the flange of the partition plate. Aftercool drain condensate discharge part structure. The discharge part structure of the aftercooler drain in the compressor of Claim 6 which clamped the heat insulating material between the inner wall of the said partition plate and the said soundproof box. The aftercooler drain discharge part structure in the compressor according to any one of claims 1 to 7, wherein a sound absorbing material is attached to the cover. The discharge part structure of the aftercooler drain in the compressor of any one of Claims 1-8 which provided the drain tank which collect | recovers the drain discharged | emitted from the said cover. The aftercooler drain discharge part structure in the compressor according to claim 9, further comprising a conduit for conveying the drain discharged from the cover to the drain tank.

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