KR20190028115A - Tandem automatic drain device for compressed air filter - Google Patents

Abstract

A tandem automatic drain device for a compressed air filter discharges wastewater using the buoyancy of the automatic drain device irrespective of a method of using a pneumatic device. The wastewater separated by a centrifugal force of a first cyclone nozzle and a second cyclone nozzle is collected into a first collecting port and a second collecting port. The collected wastewater is automatically discharged to the outside using the buoyancy of a first automatic drain device and a second automatic drain device even if the method of using a pneumatic device is intermittent or continuous.

Description

Technical Field [0001] The present invention relates to a compressed air filter for a compressed air filter,

The present invention relates to a dam-type automatic drain device for compressed air for automatically discharging separated sewage in a process of purifying compressed air through a two-stage cyclone filter for compressed air in a primary and secondary cyclone system.

In most industries, condensate, oil, etc. contained in compressed air cause problems such as poor performance of the pneumatic equipment and adherence and damage. Therefore, in order to purify the impurities contained in the compressed air, Are used together.

Compressed air used in pneumatic equipment is made by compressing atmospheric air. Contaminants such as moisture and dust are mixed in the air, so that pollutants are compressed together with the contamination during the process of compressing air with a compressor.

In the process of purifying the compressed air having a high degree of contamination as described above, the separated sewage collects in the collection port. Therefore, a device for discharging sewage is needed.

As a conventional compressed air purifying apparatus, those disclosed in the patent document (Korean Patent No. 10-2015-0130212) are known.

A conventional compressed air purifier includes a cover having an inlet and an outlet through which compressed air flows; An outer tube inserted into the cover to form a first chamber communicating with the inlet at an outer side thereof; An inner cylinder inserted in the outer cylinder and forming a second chamber communicating with the outlet on the inner side; A drain cover coupled to the lower portion of the cover to communicate with the first chamber; A discharge device disposed inside the drain cover for discharging impurities separated from the compressed air; Wherein the discharging device discharges impurities separated from the compressed air by a pressure difference between the first chamber and the second chamber.

However, in the conventional compressed air discharging device for compressed air, since the pressure difference generated in the first cyclone chamber and the second cyclone chamber is not interrupted when the pneumatic equipment is continuously used, the automatic discharge by the pressure difference is continuously There is a disadvantage that it is possible to flow back to the pneumatic device in which sewage is accumulated and used.

Korean Patent No. 10-2011-0034396 Korean Patent No. 10-2015-0130212

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide an apparatus and a method for discharging wastewater separated from a two-stage cyclone filter for compressed air to both the case where the use of the pneumatic device is intermittent (outside the cylinder) Which automatically discharges wastewater irrespective of the intermittent discrepancy of the pressure difference, in the automatic damper automatic drain apparatus for a compressed air filter.

In order to accomplish the above object, there is provided a compressor for a compressor, comprising: an inlet of a body for introducing compressed air; a first cyclone generator communicating with an inlet of a body for separating impurities contained in compressed air; A second cyclone generating unit for reconditioning the compressed air purified through the first cyclone generating unit, an outlet of a body communicating with the center of the second cyclone generating unit and discharging the purified compressed air, And a second collecting port for collecting the separated second sewage water through the second cyclone generating unit is formed.

In addition, the first stage automatic drain device including the hollow shaft in the first collecting port discharges the first waste water automatically and manually.

The differential pressure blocking differential pressure piston 414 in the second collection port maintains airtightness by the inner V packing 415 and the outer V packing 416 and the disc at the lower end of the differential pressure piston 414, And the second sewage in the second collecting port is discharged to the outside only by the two-stage auto drain device, while preventing the differential pressure between the first collecting port and the second collecting port from being transmitted.

The dam-dam automatic drain apparatus for compressed air filters comprises:

As the water level of the first waste water in the first collection port rises, the first-stage auto drain device is operated by buoyancy to discharge the first waste water to the outside. The second waste water of the second collecting port is used both intermittently and continuously in the manner of use of the pneumatic equipment, so that the second float moves upward due to buoyancy regardless of the interruption of the differential pressure, Stage auto drain device to the atmosphere through the hollow shaft of the first stage automatic drain device.

The present invention has the following effects.

In the two-stage cyclone filter for pneumatic equipment, if the use of the pneumatic device is continuous, the differential pressure is not interrupted, so that the automatic discharge of the second sewage separated from the compressed air in the second collection port can not be smoothly performed. However, by opening the discharge port by buoyancy, the auto drain device can safely discharge the second sewage continuously and automatically.

1 shows a two-stage cyclone filter perspective view for compressed air
Fig. 2 is an exploded perspective view of Fig.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
Fig. 4 is a cross-sectional view taken along line BB of Fig.
5 is a cross-sectional view taken along line CC of Fig. 3
6 is a cross-sectional view showing a part of the first stage auto drain device
7 is a cross-sectional view showing a part of the two-stage auto drain device
FIG. 8A is a sectional view of an automatic operation state of a damper auto drain device of a two-stage cyclone filter;
8B is a sectional view of the automatic operation state of the first stage automatic drain device of the two-stage cyclone filter;
Fig. 8C is a sectional view of an automatic operation state of the damper auto drain device of the two-stage cyclone filter. Fig. 8C-1 shows the automatic operation state of the first stage auto drain device, Fig. -2 is the automatic operation status of the 2-step auto drain device
8D is a manual operating state of the damper auto drain device of the two-stage cyclone filter. Fig.
9 is an exploded perspective view of the first cyclone generating unit and the second cyclone generating unit.
10 is an exploded perspective view of the first stage automatic drain apparatus
11 is an exploded perspective view of the two-stage auto drain device
12 is a cross-
Figure 13 shows the " O "
Figure 14 is a cross-
15 is an exploded perspective view of the first component

Specific embodiments of the present invention will be described with reference to the accompanying drawings

1 is a cross-sectional view taken along line AA of FIG. 1, FIG. 4 is a cross-sectional view taken along line BB of FIG. 3, and FIG. 5 is a cross- 6 is a cross-sectional view showing the parts of the first stage automatic drain device, FIG. 7 is a sectional view showing the parts of the second stage auto drain device, FIGS. 8A to 8C are sectional views showing the automatic operation state of the damper auto drain device, 10 is an exploded perspective view of the first cyclone generating unit and FIG. 10 is an exploded perspective view of the first cyclone generating unit, and FIG. 11 is a cross-sectional view of the second cyclone generating unit. 13 is an O-type lever component diagram, Fig. 14 is a cross-sectional view of a differential pressure piston, and Fig. 15 is an exploded perspective view of an external component of the first catch; Fig. FIG.

The configuration of the two-stage cyclone filter 500 of Fig. 1 or Fig.

A cyclone generating unit 200 for converting the compressed air introduced through the body into two cyclones, and dam autodrake apparatuses 300 and 400 for discharging the sewage separated from the compressed air Consists of.

The body 100 of Fig. 2 or Fig.

The body 101 has an inlet 111 and an outlet 112 on the same axis line and a lower center of the body 101 is formed in a direction perpendicular to the outlet 112 so that the bore diameter 115 can communicate with the outlet 112, An O-ring 202 groove and a bore screw 114 are formed at the inner end of the body 101, and a hexagonal flange shape in which a lower portion of the body 101 is open is formed.

The cyclone generator 200 of FIG. 2 or FIG. 3 includes a first cyclone generator 200-1 and a second cyclone generator 200-2.

The first cyclone generating unit 200-1 of FIG. 3 or FIG.

The first cyclone nozzle 210 is mounted on the nozzle guide surface 116 communicated with the inlet 111 of the body 101 and supported by the first cyclone guide 213 and the second cyclone guide 214, The screw at the center upper end of the 1 cyclone guide 213 is fixed to the bore screw 114 of the body 101 and then fixed to the inner end of the bore diameter 115 by the O-ring 202.

When the first cover 201 having the lower hexagonal surface and the upper portion of the body 101 is assembled, airtightness is maintained by the O-ring 212. When the first cover 201 is fixed by the fixing bolt 117 of FIG. 2, And a cylindrical first collector pipe 201a is formed on the inner surface of the first cover 201. [

A first cover equilibrium cam 203 is formed on a lower portion of the first cover 201. A first catch equilibrium cam 301a is assembled to the first cover equilibrium cam 203 by being rotated by 45 degrees, And the airtightness is maintained by the O-ring 302. As shown in Fig.

The display window 304 of FIG. 15 is sealed by a display window packing 306 and is fixed by a nut 305. The display window 304 of FIG.

The second cyclone generator 200-2 of Fig. 3 or Fig.

The second cyclone chamber 222 is formed by press-fitting the second cyclone nozzle 220 into the press-in portion 221 between the first cyclone guide 213 and the second cyclone guide 214, 222, a conical tube is press-fitted to form a second collector pipe 223.

A collision plate 226 and a bucket 225 are inserted into a stepped surface 401b located above the second collection port 401 and an O-ring 402 is inserted between the second collection port 401 and the second cyclone nozzle support 228 And is engaged with the internal screw 224 of the first cover 201. [

A flange 410 connected to the first stage auto drain device 300 is inserted into the concave portion of the lower end of the second collecting hole 401. The upper end shaft 422 of the flange 410, Pressure differential piston 414 is interposed between the second cylinder 401a of the first and second collecting ports 401 and the inner V packing 415 and the outer V packing 416 are inserted into the inner and outer grooves of the differential pressure piston 414. [ To maintain airtightness.

The disc 413 is coupled between the lower side of the differential pressure piston 414 and the upper portion of the flange 410 to intermittently use the pneumatic device to intermittently pressurize the first and second collecting ports 301 and 401 ) To prevent the differential pressure from being transmitted.

2, 3, 6, and 7, the dam damper 300,

Stage automatic drain apparatus 300 having a hollow shaft for discharging the first waste water separated in the first cyclone chamber 211 and a two-stage auto drain apparatus 300 for discharging the second waste water separated in the second cyclone chamber 222. [ Device 400 shown in FIG.

Stage automatic drain apparatus 300 with a hollow shaft,

The mesh filter 323 and the drain bolt 322 are inserted into the lower assembly 301b of the first catching part 301 and the air tightness is maintained by the O-ring 324 and the nut 329 ). A sleeve 325 is assembled to the inner surface of the drain bolt 322 and a stopper 325b is formed on the upper end of the sleeve 325. An O-ring 327 is assembled in the outer circumferential groove of the sleeve 325 to maintain the airtightness, and a V packing 326 is assembled in the inner circumferential groove, thereby controlling the automatic discharge.

An external thread 328a of the hose fitting 328 is coupled to a screw located in the lower portion of the drain bolt 322 to enable automatic and manual drainage Do.

The lower end recessed portion of the first cylinder 312 is press-fitted into the upper outer diameter recessed portion of the drain bolt 322. A piston 318 is embedded in the inner surface of the first cylinder 312, And the upper hollow shaft 318a of the piston 318 maintains airtightness between the inner surface and the outer diameter groove of the piston 318 by the V packing 321. The lower hollow shaft 318a of the piston 318, The airtightness is maintained by the V packing 316 and fixed by the stop ring 315.

A spring 319 located on the upper surface of the piston 318 is abutted against the upper surface of the first cylinder chamber 332 and an automatic discharge valve portion 318b under the piston 318 is assembled in the sleeve 325 V packing 326. In this way,

A damper hole 320 is formed in the first cylinder chamber 332 and the lower hollow shaft 318c of the piston 318 to communicate with each other.

A check valve shaft 330 and a hollow shaft 317 protruding from the upper side of the first cylinder chamber 332 are formed in parallel to each other. Outside the check valve shaft 330 and the hollow shaft 317, The first float 311 is formed with a first pressure balancing pipe 331 for minimizing the internal and external pressure difference and a support hole 333 formed at the upper right end thereof.

A V-packing 316 for airtight use is fixed to the upper end of the hollow shaft 317 by a stop ring 315. A check valve chamber 313 is formed at the upper end of the check valve shaft 330, Stage check valve 313 is assembled in the check valve chamber 313b.

Lever 314 is formed in the first-stage check valve 313 and the left end of the " O " -shaped lever 314 is assembled, and the right- The first float 311 is coupled to the upper right support hole 333 of the first float 311 so that the buoyancy of the first float 311 is lower than the buoyancy of the first float 311 when the first wastewater of the first catch 301 is raised. .

When the security cover 310 is assembled to the cylinder outer-diameter groove 312a, the first-stage auto drain apparatus 300 having the hollow shaft therein is completed.

In the two-stage auto drain device 400 of Fig. 7 or Figs. 2 and 11,

A flange 410 connected to the first stage auto drain device 300 is press-fitted into a lower recessed portion of the second catch 401. A discharge pipe 411 is formed below the flange 410. The discharge pipe 411 Is coupled with the hollow shaft 317 of the first cylinder 312 in the first stage automatic drain apparatus 300 and is fixed by the stop ring 315 while maintaining airtightness by the V packing 316.

The differential pressure type pressure piston 414 between the upper shaft 422 of the flange 410 and the second cylinder 401a of the second collecting port 401 is supported by a disk 413, (415) and the external V packing (416).

A plurality of splines 412 are formed on the outer surface of the upper shaft 422 of the flange 410. A second float 419 is assembled to the outer surface of the spline 412, A second pressure equalizing pipe 421 for minimizing internal and external pressure differences and a lever assembly hole 418 at the lower right end.

A two-stage check valve chamber 417c is formed in the upper shaft 422 of the flange 410 and a two-stage check valve 417 is installed in the two-stage check valve chamber 417c. The left end of the two-stage lever 420 is assembled to the check valve assembly hole 417a of the two-stage check valve 417 and the two-stage lever 420 is positioned at the lower right end of the second float 419 And engages with the lever assembly hole 418.

As described above, the two-stage auto drain device 400 is constructed.

The function of the above configuration is described as follows.

The first cyclone generating unit 200-1 of FIG. 2 or FIG. 3 includes:

When the compressed air flowing from the inlet 111 of the body 101 reaches the first cyclone nozzle 210 through the outside of the bore diameter 115, a centrifugal force is generated by the first cyclone nozzle 210, The compressed air having the centrifugal force rotates the inner surface of the first cover 201 and separates the first waste water such as moisture, oil, and foreign matter.

The separated first wastewater is collected in the first collection port 301 and the compressed air purified in the first cyclone chamber 211 is transferred to the second cyclone generation unit 200-2.

The second cyclone generator 200-2 of FIG. 2 or FIG. 3 comprises:

The compressed air compressed in the first cyclone chamber 211 flows into the space between the first cyclone guide 213 and the second cyclone nozzle supporter 228. The introduced compressed air passes through the second cyclone nozzle 220 and flows into the second cyclone chamber 222 as a cyclone having an increased centrifugal force. The centrifugal force is further increased by rotating the inner surface of the second collector pipe 223 Minute water, oil and foreign matter are separated. At this time, the separated second waste water collects in the second collection port 401.

The compressed air in the remaining cyclone bumps against the impingement plate 226 in the state where residual impurities are contained in the second collector pipe 223 and the turning is stopped and the remaining impurities are finally separated and collected in the second collection port 401.

The compressed air separated under the impingement plate 226 is sent to the outlet 112 through the inner discharge pipe 215 as compressed air purified in the second collector pipe 223 through the exhaust pipe 227.

A pipeline resistance is generated by the respective nozzles and cyclone passages in the process of purifying the compressed air and a high pressure is applied to the first cyclone chamber 211 and a high pressure is supplied to the second cyclone chamber 222 and the second collecting hole 401 generate a low pressure to generate a pressure difference.

The inner V packing 415 of the pressure-blocking differential pressure piston 414 and the inner V packing 414 of the pressure-blocking differential pressure piston 414 are provided so that the second wastewater of the second water collection port 401, which is a low pressure region, The external V packing 416 prevents the differential pressure from being transmitted while maintaining airtightness, thereby forming an independent region.

The first wastewater of the first collection port 301 is discharged to the first stage auto drain device 300 and the second wastewater of the second collection port 401 is discharged to the second stage auto drain device 400.

The damper auto drain device (300, 400) comprises:

FIG. 8A is a view showing a state where the inlet 111 and the outlet 112 of the two-stage cyclone filter 500 are in a closed state;

The drain port 325a of the first stage automatic drain device 300 is connected to the piston 318 when the piston 318 is brought into close contact with the upper surface of the drain bolt 322 by the elastic force of the spring 319, The automatic discharge valve portion 318b is separated from the V packing 326 of the sleeve 325 and is always opened and the inside of the filter is at atmospheric pressure.

The outlet port 411a of the two-stage automatic drain device 400 of the second collecting port 401 is in a state in which the two-stage check valve 417 is disconnected due to the descent of the second float 419. [

8B shows a state in which the inlet 111 of the two-stage cyclone filter 500 is opened and the outlet 112 is closed;

When the inside of the two-stage cyclone filter 500 is in the pressurized state, the piston 318 compresses the spring 319 in the first cylinder 312 of the first-stage auto drain device 300 by the internal pressure transmitted from the lower portion And the automatic discharge valve unit 318b of the lower portion of the piston 318 is closed by the V packing 326 while the discharge port 325a is closed and the first cylinder chamber 332 are at atmospheric pressure.

The discharge port 411a of the two-stage auto drain device 400 is closed in the second collecting port 401 while the second check valve 417 is closed due to the descent of the second float 419 .

FIG. 8C shows a state in which the inlet 111 and the outlet 112 of the two-stage cyclone filter 500 are open in the automatic operation state of the dam self-draining device of the two-stage cyclone filter;

The operating state of the first stage auto drain device 300 in FIG.

The first waste water separated in the first cyclone chamber 211 is collected in the first collection port 301. When the level of the first waste water collected in the first collection port 301 rises, The buoyancy force is transmitted to the "O " type lever 314 and the first stage check valve 313 coupled with the" O "type lever 314 is opened.

When the first-stage check valve 313 is opened, purified compressed air existing in the first collection port 301 flows into the first cylinder chamber 332, and the piston 318 of the first cylinder chamber 332 And the lower automatic discharge valve portion 318b of the piston 318 is separated from the V packing 326 of the sleeve 325 by the elastic force of the spring 319 and the internal pressure of the compressed air, And the discharge of the first waste water in the first collection port 301 is started.

When the first float 311 is lowered due to the discharge of the first waste water, the first-stage check valve 313 is closed and the inflow of compressed air is interrupted. The compressed air in the first cylinder chamber 332 is a sum of the load of the compressed air applied to the lower end surface of the piston 318 and the load of the compressed air applied to the upper end surface of the piston 318 and the spring 319 Is discharged through the damper hole until this balance is achieved. Even if the inflow of the compressed air is blocked, the first waste water of the first collection port 301 is continuously discharged until the upper and lower pressures of the compressed air in the first cylinder chamber 332 become equal.

When the pressure in the first cylinder chamber 332 is lowered, the piston 318 rises and the automatic discharge valve portion 318b is closed by the V packing 326 of the sleeve 325 to discharge the first waste water Lt; / RTI > The first waste water discharged through the discharge port 325a is discharged to the outside through the sleeve 325 and the hose fitting 328. [

The operating state of the two-stage auto drain device 400 in FIG. 8C-2 is as follows.

The second waste water is collected in the second collection port 401 while being separated from the second cyclone chamber 222. When the level of the second wastewater collected in the second collection port 401 rises, buoyancy is generated in the second float 419 and buoyancy of the second float 419 is transmitted to the second-stage lever 420 At the same time that the two-stage check valve 417 is opened, the discharge port 411a is opened linearly and the discharge of the second waste water is started.

When the level of the second wastewater is lowered, the second float 419 is lowered, the second-stage check valve 417 is closed, and the discharge of the second wastewater is terminated.

The second wastewater discharged through the outlet 411a passes through the hollow shaft 317 of the first stage auto drain device 300 and the hollow shaft 318c below the piston 318 and flows through the first stage auto drain device 300, And is discharged to the outside through the sleeve 325 and the hose fitting 328 of the hose.

FIG. 8D shows a manual operation state of the damper auto drain device in a state in which the inlet 111 and the outlet 112 of the two-stage cyclone filter 500 are open;

It is possible to prevent the foreign matter from leaking into the V packing 326 of the sleeve 325 connected to the discharge port 325a in the automatic state of the first stage auto drain device 300, If there is a problem with drainage, turning the external thread 328a of the hose fitting 328 to the left may switch to a passive drain mode. After switching to manual drain, air cleaning and manual discharge are enabled.

A dam-dam automatic drain apparatus for a compressed air filter is also a core of the present invention, so that even when the pneumatic device is intermittently or continuously used as described above, the discharge port can be opened by buoyancy to discharge the sewage water safely.

500: Two-stage cyclone filter for compressed air 100: Body
101: body 111: entrance
112: Exit 113: Modular Coupling O-ring
114: Bore screw 115:
116: nozzle guide surface 117: fixing bolt
200: cyclone generator 200-1: first cyclone generator
200-2: second cyclone generating unit 201: first cover
201a: 1st collection pipe 202: O-ring
203: first cover balancing cam 210: first cyclone nozzle
211: first cyclone chamber 212: O-ring
213: first cyclone guide 214: second cyclone guide
215: inner discharge pipe 220: second cyclone nozzle
221: press-in portion 222: second cyclone chamber
223: Second collecting tube 224: Inner thread
225: Buffle 226: Collision plate
227: exhaust pipe 228: second cyclone nozzle support
229: Impact plate buffle 300, 400: Dam dam auto drain device
300: first stage automatic drain device 301: first collecting port
301a: First collecting ball balance cam 301b: Lower assembly
302: O-ring 303: key
304: Display window 305: Nut
306: display window packing 310: security cover
311: first float 312: first cylinder
312a: cylinder outer diameter groove 313: one-stage check valve
313a: Lever mounting hole 313b: 1st check valve chamber
314: "O" type lever 315: stop ring
316: V packing 317: Hollow shaft
318: piston 318a: upper hollow shaft
318b: Automatic discharge valve unit 318c: Lower hollow shaft
319: spring 320: damper hole
321: V packing 321a: V packing part
322: drain bolt 323: net filter
324: O-ring 325: Sleeve
325a: Outlet port 325b: Stopper
326: V packing 327: O-ring
328: Hose fitting 328a: External thread
329: nut 330: check valve shaft
331: first pressure balance pipe 332: cylinder chamber
333: Support hole 400: Two-stage auto drain device
401: second collecting port 401a: second cylinder
401b: stage surface 402: O-ring
410: flange 411: discharge pipe
411a: Outlet 412: Spline
413: Disk 414: differential pressure piston
415: Internal V Packing 416: External V Packing
417: Double check valve 417a: Check valve assembly hole
417b: Check valve seat 417c: Double check valve chamber
418: lever assembly hole 419: second float
420: Two-stage lever 421: Second pressure balance pipe
422: upper shaft 422a: differential pressure valve

Claims (8)

A first stage automatic drain device having a hollow shaft for discharging the first wastewater separated from the first cyclone chamber and a second stage auto drain device for discharging the second wastewater separated from the second cyclone chamber, Dam dam automatic drain device with built-in shaft. 2. The damper automatic drain apparatus according to claim 1, wherein the hollow shaft at the center of the first cylinder in the one-stage auto drain device maintains airtightness by V packing at the upper inner end and the lower inner end. The V-packing of the outer diameter of the piston is in close contact with the inner surface of the first cylinder to maintain the airtightness, and the lower end of the piston, The automatic discharge valve unit of the present invention maintains the airtightness by the V packing on the inner surface of the sleeve,
And a damper hole connected to the atmospheric pressure is provided between the piston upper first cylinder chamber and the lower hollow shaft. The automatic transmission according to claim 3, wherein a discharge pipe of the two-stage auto drain device is inserted into the upper end of the hollow shaft of the first cylinder, and a lever assembly hole of the first-stage check valve and a first- And an "O" type lever is coupled so that the axis of the lever connected to the discharge port does not cross the discharge pipe. A sleeve for discharging the first wastewater by automatic and manual operation is built in the inner surface of the drain bolt, the V packing of the groove in the sleeve is engaged with the lower automatic discharge valve portion of the piston to maintain airtightness, And the threaded portion of the hose fitting is turned to the right when the first waste water is automatically discharged and the threaded portion of the hose fitting is turned to the left side when it is manually discharged so as to be brought close to the upper stop position. Damper auto drain device. The second collecting port supports the second cyclone nozzle and the second collecting pipe, and is fixed to the internal screw of the first cover while maintaining the airtightness by the O-ring of the O-ring stage surface.
And a second float is vertically elevated on an outer surface of the upper shaft of the flange, and a second float is connected to the lower hollow shaft of the cylinder, There are a number of splines.
And a check valve seat is formed inside the upper shaft of the flange. [7] The apparatus of claim 6, wherein a second cylinder is formed on the inner surface of the lower end of the second collection port,
A differential pressure type piston for pressure shutoff is formed between the second cylinder inner surface and the flange upper shaft, and the inner V packing and the outer V packing of the differential pressure type piston inner and outer grooves maintain airtightness.
And a disk is assembled to the lower end of the differential pressure type piston to fix the up and down operation. [Claim 7] The method according to claim 7, wherein a stepped surface is formed on the upper side of the second collecting hole, a buffel is assembled on the stepped surface, and a plurality of impingement plates and an exhaust pipe are coupled to the upper surface of the baffle. Damper auto drain device.

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