A spunlace nonwoven energy-saving fan system

Abstract

This application relates to an energy-saving spunlace nonwoven fabric fan system, belonging to the field of water vapor separation technology. The energy-saving fan system includes a fan body, a water vapor separation device, and a silencer. One end of the silencer is connected to the air outlet of the fan body, and the air inlet of the fan body is connected to the water vapor separation device. The water vapor separation device includes a separation cylinder, a separation spiral channel disposed within the separation cylinder, and a conveying pipe communicating with the side wall of the separation cylinder. A spiral channel is formed within the separation cylinder, and a vertical channel is disposed within the conveying pipe. The vertical channel is tangentially connected to the spiral channel, and the outlet of the vertical channel is connected to the starting end of the spiral channel. This application has the effect of improving water vapor separation efficiency.

Description

Technical Field

[0001] This application relates to the field of water vapor separation technology, and in particular to a spunlace nonwoven energy-saving fan system. Background Technology

[0002] Spunlace nonwoven fabric is made by spraying high-pressure micro-streams of water onto one or more layers of fiber web, causing the fibers to entangle together, thereby strengthening the web and giving it a certain strength. The resulting fabric is called spunlace nonwoven fabric.

[0003] After the hydroentanglement process, the production of spunlace nonwoven fabric typically requires a dehydration and drying system to forcibly absorb and remove most of the free water from the wet fabric, reducing its moisture content. Existing dehydration and drying systems usually employ high-pressure centrifugal fans. The output end of the centrifugal fan has a cylindrical casing; the airflow enters the casing and rotates at high speed. Water droplets are thrown against the wall under centrifugal force, achieving water-vapor separation. However, this water-vapor separation effect is relatively poor, and small water droplets still escape and enter the fan, causing impeller corrosion. Summary of the Invention

[0004] To improve the water vapor separation efficiency in the dehydration and drying system, this application provides an energy-saving spunlace nonwoven fabric fan system.

[0005] The spunlace nonwoven fabric energy-saving fan system provided in this application adopts the following technical solution:

[0006] A spunlace nonwoven energy-saving fan system includes a fan body, a water vapor separation device, and a silencer. One end of the silencer is connected to the air outlet of the fan body, and the air inlet of the fan body is connected to the water vapor separation device. The water vapor separation device includes a separation cylinder, a separation spiral channel disposed within the separation cylinder, and a conveying pipe communicating with the side wall of the separation cylinder. A spiral channel is formed within the separation cylinder, and a vertical channel is disposed within the conveying pipe. The vertical channel is tangentially connected to the spiral channel, and the outlet of the vertical channel is connected to the starting end of the spiral channel.

[0007] By adopting the above technical solution, the combination of the fan body, water vapor separation device and silencer can realize the treatment and noise reduction of humid airflow in the production of spunlace nonwoven fabric. The separation spiral flow channel and the spiral flow channel of the water vapor separation device make the airflow spiral. With the vertical flow channel of the conveying pipeline, the airflow is tangentially introduced into the starting end of the spiral flow channel, which enhances the internal turbulence of the gas and increases the contact area of ​​water vapor during transportation. It fully utilizes the Coanda effect, enhances the water vapor separation effect, reduces the moisture entering the fan, and avoids impeller corrosion.

[0008] Optionally, the ratio of the inner diameter of the silencer to the ventilation section of the air outlet of the fan body is 1.2-1.4; multiple sets of diversion pipes are arranged at intervals along the axial direction on the conveying pipeline, and the ratio of the inner diameter of the diversion pipe to the inner diameter of the vertical flow channel is 0.08-0.1.

[0009] By adopting the above technical solutions, the ratio of the inner diameter of the silencer to the ventilation section of the fan body outlet is set at 1.2-1.4, which can optimize the airflow channel and reduce airflow obstruction and noise generation. The diversion pipes are set at certain intervals on the delivery pipeline, and the ratio of the inner diameter of the diversion pipe to the inner diameter of the vertical flow channel is set at 0.08-0.1, which can enhance the diversion effect and further improve the water vapor separation efficiency.

[0010] Optionally, a liquid collection tank is provided at the bottom of the separation cylinder, and a drainage structure is provided in the liquid collection tank. The drainage structure includes a drain pipe provided on the outside of the bottom of the separation cylinder, a filter ring provided corresponding to the drain pipe, and a flow-blocking ring provided on the top of the filter ring. The side wall of the filter ring is arrayed with multiple filter through holes, and the separation cylinder has a flow guide surface in the liquid collection tank that is inclined downward toward the filter ring.

[0011] By adopting the above technical solution, a liquid collection tank is set at the bottom of the separator to collect the separated liquid. The guide surface of the liquid collection tank can cause the liquid to converge towards the filter ring. The filter holes on the side wall of the filter ring can filter the liquid. The baffle ring can prevent the liquid from splashing out. The drain pipe can discharge the filtered liquid, which improves the collection and discharge effect of the liquid after water vapor separation.

[0012] Optionally, the separation cylinder has a hydrophilic coating on the inner wall of the spiral flow channel and a cooling component corresponding to the hydrophilic coating on the outer wall. The cooling component includes a sealing jacket layer, a refrigeration system, a temperature control valve, and a delivery pump body. The sealing jacket layer wraps around the outer wall of the spiral flow channel.

[0013] By adopting the above technical solution, a hydrophilic coating is set on the inner wall of the spiral flow channel of the separator, which enables small water droplets to adhere better. The cooling components set on the outer wall can reduce the temperature and further promote water vapor condensation. The sealing jacket layer wrapping the outer wall of the spiral flow channel helps to maintain a low temperature environment, which improves the overall water vapor separation effect, reduces the escape of small water droplets into the fan, and avoids impeller corrosion.

[0014] Optionally, the separation cylinder is further provided with a flow guiding structure for guiding liquid delivery, the inner wall of the spiral channel is provided with a spiral inner groove, the hydrophilic coating is provided in the spiral inner groove, and the flow guiding structure includes a capillary micro-groove provided at the bottom of the spiral inner groove and a negative pressure adsorption component provided at the bottom of the separation cylinder and communicating with the capillary micro-groove.

[0015] By adopting the above technical solution, a guiding structure for guiding liquid transport is set in the separation cylinder, a spiral inner groove is opened on the inner wall of the spiral flow channel and a hydrophilic coating is placed therein, and with the capillary micro groove and negative pressure adsorption component at the bottom, the separated liquid can be guided and collected more efficiently, reducing the liquid residue in the separation cylinder and improving the water vapor separation efficiency.

[0016] Optionally, the negative pressure adsorption assembly includes an adsorption driving component, a vacuum pipe connecting the adsorption driving component and the capillary microchannel, a hydrophobic isolation net disposed in the vacuum pipe, and a drain valve body disposed in the vacuum pipe. A negative pressure chamber is formed between the hydrophobic isolation net and the drain valve body, and the bottom of the capillary microchannel corresponds to the hydrophobic isolation net.

[0017] By adopting the above technical solution, a negative pressure is formed in the vacuum pipeline by using an adsorption driving component. The separated liquid is adsorbed into the negative pressure chamber by the capillary microchannel. The hydrophobic isolation net can prevent gas from entering the negative pressure chamber, and the drain valve body facilitates the discharge of liquid from the negative pressure chamber.

[0018] Optionally, the negative pressure chamber may be arranged with an array of multiple honeycomb cavities, the upper and lower ends of the honeycomb cavities being interconnected, and the drain valve body may include a balancing valve for balancing the internal and external air pressure and a drain solenoid valve.

[0019] By adopting the above technical solution, multiple honeycomb cavities with interconnected upper and lower ends are set in the negative pressure chamber, which can guide water to the bottom of the negative pressure chamber and reduce the probability of water splashing in the negative pressure chamber.

[0020] Optionally, the separator is equipped with a wire mesh demister at the top outlet.

[0021] By adopting the above technical solution, a wire mesh demister is installed at the top outlet of the separator to further intercept tiny water droplets; by using the connecting flange, the first flange and the second flange, and fixing them with bolts, a stable connection can be achieved between the wire mesh demister, the separator, and the silencer.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] The design of the spiral flow channel and vertical flow channel in the water vapor separation device, with the vertical flow channel tangentially connected to the spiral flow channel, enhances the internal turbulence of the gas and increases the contact area of ​​water vapor during transportation, giving full play to the Coanda effect and enhancing the water vapor separation effect;

[0024] The hydrophilic coating and cooling components allow small water droplets to adhere better, and the cooling components on the outer wall can reduce the temperature and further promote water vapor condensation.

[0025] By designing a flow guiding structure, the separated liquid can be guided and collected more efficiently, reducing liquid residue in the separation cylinder and improving water vapor separation efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0027] Figure 2 This is a cross-sectional schematic diagram of Example 1.

[0028] Figure 3 This is a cross-sectional schematic diagram of Example 2.

[0029] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0030] Explanation of reference numerals in the attached drawings: 1. Fan body; 2. Water vapor separation device; 21. Separation cylinder; 211. Air inlet; 212. Water inlet; 213. Spiral flow channel; 214. Liquid collection tank; 2141. Guide surface; 215. Spiral inner groove; 216. Hydrophilic coating; 217. First flange; 22. Separation spiral flow channel; 23. Conveying pipeline; 231. Vertical flow channel; 232. Drain pipe; 24. Drain pipe; 25. Filter ring; 251. Filter through hole; 252. Sedimentation gap; 2 6. Baffle ring; 261. Baffle ramp; 27. Wire mesh demister; 271. Connecting flange; 3. Silencer; 31. Second flange; 4. Cooling assembly; 41. Sealing jacket layer; 42. Refrigeration system; 43. Thermostatic valve; 44. Delivery pump body; 5. Flow guiding structure; 51. Capillary microgroove; 52. Negative pressure adsorption assembly; 521. Adsorption drive component; 522. Vacuum pipeline; 5221. Negative pressure chamber; 523. Hydrophobic isolation mesh; 524. Drain valve body; 53. Connecting hole. Detailed Implementation

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0032] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0033] This application discloses an energy-saving spunlace nonwoven fabric fan system.

[0034] Example 1:

[0035] Reference Figure 1 A spunlace nonwoven fabric energy-saving fan system includes a fan body 1, a water vapor separation device 2, and a silencer 3. The fan body 1 is an existing high-pressure centrifugal fan. The silencer 3 is an integral tube, one end of which is sealed and connected to the air outlet of the fan body 1 to reduce the high-intensity noise pollution generated by the fan body 1 during operation. The air inlet of the fan body 1 is connected to the water vapor separation device 2.

[0036] The water vapor separation device 2 includes a separation cylinder 21, a separation spiral flow channel 22 disposed within the separation cylinder 21, and a conveying pipeline 23 disposed on the side wall of the separation cylinder 21. The separation cylinder 21 is a vertically arranged cylindrical body, with an air inlet 211 at the top and a water inlet 212 at the bottom. One end of the silencer 3 is connected to the air inlet 211. The separation spiral flow channel 22 is evenly disposed along the height direction on the inner wall of the separation cylinder 21. The separation spiral flow channel 22 forms a spiral flow channel 213 within the separation cylinder 21, and the spiral flow channel 213 is a gas channel with a constant cross-section.

[0037] The conveying pipeline 23 is arranged horizontally, and a vertical flow channel 231 is formed inside it. One end of the vertical flow channel 231 is tangentially connected to the spiral flow channel 213, and the output end of the vertical flow channel 231 corresponds to the starting end of the spiral flow channel 213. The conveying pipeline 23 is evenly spaced with guide pipes 232 along its length. The opening of the guide pipe 232 corresponds to the wet cloth, so that water vapor enters from the guide pipe 232, and then enters the spiral flow channel 213 along the vertical flow channel 231. The water vapor is separated in the separation cylinder 21. The separated water is discharged downward from the water outlet 212, and the gas is discharged upward from the gas outlet 211, and then discharged from the outlet of the fan along the silencer 3.

[0038] In this embodiment, the ratio of the inner diameter of the silencer 3 to the ventilation cross-section of the air outlet of the fan body 1 is 1.2-1.4. The ratio of the inner diameter of the guide pipe 232 to the inner diameter of the vertical flow channel 231 is 0.08-1. The ratio of the cross-section of the spiral flow channel 213 to the cross-sectional area of ​​the air inlet 211 is between 2.5 and 4, so that the fully compressed airflow forms an effective cyclone, which fully combines the centrifugal force and wall adhesion effect generated by the cyclone with the internal disturbance brought by the vertical airflow, thereby improving the separation effect.

[0039] The bottom of the separator 21 is provided with a liquid collection tank 214 for collecting water droplets. The liquid collection tank 214 has a guide surface 2141 that slopes downward toward the water inlet. The guide surface 2141 is annular, and the water inlet and the guide surface 2141 are coaxially arranged. The separator 21 is also provided with a drainage structure in the liquid collection tank 214. The drainage structure includes a drain pipe 24, a filter ring 25, and a baffle ring 26, which are located on the outer side of the bottom of the separator 21 and correspond to the water inlet.

[0040] The filter ring 25 is a vertically arranged annular tube, coaxially arranged with the water inlet. The filter ring 25 has arrayed filter holes 251 penetrating both side walls, and a sedimentation gap 252 exists between the bottom filter hole 251 and the bottom wall of the collection tank 214. The bottom of the collection tank 214 has a mounting surface for fixing the filter ring 25, which is welded to the mounting surface. A baffle ring 26 is welded to the top of the filter ring 25, covering the top of the filter ring 25. The top of the baffle ring 26 also has a baffle slope 261 sloping downwards towards the collection tank 214. The baffle ring 26 prevents water droplets condensing in the spiral track from directly entering the water inlet; instead, the water droplets fall onto the top surface of the baffle ring 26 and flow along the baffle slope 261 to the guide surface 2141.

[0041] The implementation principle of the spunlace nonwoven energy-saving fan system in this application embodiment is as follows: when the fan is started, water vapor enters from the inlet pipe 232, and then enters the separation cylinder 21 tangentially along the vertical flow channel 231. Under the Coanda effect, the water vapor moves spirally along the spiral flow channel 213. Water droplets adhere to the water vapor to achieve water vapor separation. The water droplets are discharged from the bottom water outlet 212 under the action of gravity. The separated gas is discharged from the top gas outlet 211.

[0042] Example 2:

[0043] To improve the separation and flow efficiency of cooling water, this embodiment adds a hydrophilic coating 216, a cooling component 4, and a flow guiding structure 5, while the rest of the structure remains the same as in embodiment 1.

[0044] The separator 21 has a spiral inner groove 215 on the inner wall of the spiral flow channel 213, and a hydrophilic coating 216 is provided on the inner wall of the spiral inner groove 215. The hydrophilic coating 216 can be made of special nano-silica coating, titanium dioxide-based coating, specific polymer coating, etc., to reduce the contact angle, so that the tiny water droplets impacting the wall surface spread into a continuous water film and enhance the Coanda effect.

[0045] The separator 21 has a cooling assembly 4 on its outer wall, corresponding to the spiral inner groove 215. The cooling assembly 4 includes a sealing jacket layer 41, a refrigeration system 42, temperature control valves 43, and a delivery pump body 44. The sealing jacket layer 41 is welded and fixed to the outer wall of the separator 21, corresponding to the spiral inner groove 215. The interior of the sealing jacket layer 41 has a refrigeration chamber for refrigerant delivery. The bottom and top of the sealing jacket layer 41 have a refrigerant outlet and a refrigerant inlet respectively, which are connected to the refrigeration system 42. The refrigeration system 42 is consistent with the vapor compression refrigeration structure in the prior art. Multiple sets of temperature control valves 43 are evenly distributed on the wall of the separator 21 to detect the wall temperature, thereby controlling the delivery pump body 44 to deliver refrigerant to the refrigeration chamber.

[0046] The flow guiding structure 5 includes a capillary microchannel 51 disposed at the bottom of the spiral inner groove 215 and a negative pressure adsorption component 52 disposed at the bottom of the spiral track and corresponding to the capillary microchannel 51. The width of the capillary microchannel 51 is between 0.2mm and 0.5mm, and the depth is 0.05mm.

[0047] Gas enters the spiral channel 213 from the vertical channel 231. Under the Coanda effect, the gas moves spirally along the hydrophilic coating 216. The cooling component 4 cools the spiral inner groove 215, causing the liquid water in the gas to cool and uniformly adhere to the hydrophilic coating 216, forming a water film. As gas is continuously input, the thickness of the water film increases. When the water film contacts the capillary microchannel 51, capillary force draws the water film into the capillary microchannel 51. Adjacent upper and lower spiral inner grooves 215 are connected by capillary microchannels 51, allowing the upper water film to gradually move cooling water to the lower water film. The bottom spiral inner groove 215 has a connecting hole 53 shared by multiple capillary microchannels 51. In this embodiment, every five microchannels share one connecting hole 53.

[0048] The negative pressure adsorption assembly 52 includes an adsorption drive 521, a vacuum pipe 522, a hydrophobic isolation net 523, and a drain valve body 524. The adsorption drive 521 is a prior art vacuum pump body, fixed to the outer wall of the separation cylinder 21 by a support plate. This vacuum pump body has an air extraction pipe for drawing air from the vacuum pipe 522. The vacuum pipe 522 is fixedly installed at the bottom of the spiral pipe, and the hydrophobic isolation net 523 is sealed and installed at the top of the vacuum pipe 522. The hydrophobic isolation net 523 and the connecting hole 53 are in zero-gap fit, allowing only liquid water molecules to pass through, while gas is physically intercepted. A negative pressure chamber 5221 is formed between the hydrophobic isolation net 523 and the drain valve. Multiple sets of isolation plates are also provided within the negative pressure chamber 5221 in the vacuum pipe 522, dividing the negative pressure chamber 5221 into an array of honeycomb cavities. The upper and lower ends of the honeycomb cavities are interconnected.

[0049] A drain valve body 524 is located at the bottom of the vacuum pipe 522 and is used to control the discharge of liquid water. The drain valve body 524 includes a balancing valve and a drain solenoid valve. The balancing valve is a small-diameter solenoid valve, which is connected to the negative pressure chamber 5221. The inlet of the drain solenoid valve is connected to the negative pressure chamber 5221. When draining, the balancing valve is first opened to allow a small amount of air to enter the chamber to balance the internal and external air pressure, and then the drain solenoid valve is opened. The water is discharged under gravity and flows to the collection tank 214.

[0050] To further reduce the probability of water droplets entering the fan, this embodiment also provides a wire mesh demister 27 at the air inlet 211 of the separator 21, and a connecting flange 271 is provided on the outside of the wire mesh demister 27. The top of the separator 21 has a first flange portion 217 corresponding to the connecting flange 271, and the inlet end of the silencer 3 has a second flange portion 31 corresponding to the first flange portion 217. The wire mesh demister 27 is mounted on the first flange portion 217 via the connecting flange 271, and then the first flange portion 217, the connecting flange 271, and the second flange portion 31 are fixed by bolts.

[0051] The implementation principle of the spunlace nonwoven energy-saving fan system in this application embodiment is as follows: when the fan is started, water vapor enters from the inlet pipe 232, and then enters the separation cylinder 21 tangentially along the vertical flow channel 231. Under the Coanda effect, the water vapor moves spirally along the spiral flow channel 213. Under the action of the cooling component 4 and the hydrophilic coating 216, the water droplets are cooled and attached to the spiral wall to form a water film, thereby achieving water vapor separation. The water droplets are discharged from the bottom water outlet 212 under the action of gravity.

[0052] As gas is continuously input, the thickness of the water film increases. When the water film comes into contact with the capillary groove 51, it uses capillary force to draw water into the capillary groove 51. The water accumulates in the connecting hole 53 to form a local high pressure. This high pressure overcomes the repulsive force of the hydrophobic isolation net 523, and the water enters the negative pressure chamber in the form of a thin stream. The water entering the chamber will flow along the inner wall of the honeycomb chamber due to surface tension, guiding the water to the area where the drain valve body 524 is located. When the water accumulates to a certain amount at the bottom of the honeycomb chamber, the drain valve body 524 is activated to discharge the water.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A spunlace nonwoven fabric energy-saving fan system, characterized in that, The device includes a fan body (1), a water vapor separator (2), and a silencer (3). One end of the silencer (3) is connected to the air outlet of the fan body (1), and the air inlet of the fan body (1) is connected to the water vapor separator (2). The water vapor separator (2) includes a separation cylinder (21), a separation spiral channel (22) disposed in the separation cylinder (21), and a conveying pipe (23) connected to the side wall of the separation cylinder (21). A spiral channel (213) is formed in the separation cylinder (21), and a vertical channel (231) is disposed in the conveying pipe (23). The vertical channel (231) is tangentially connected to the spiral channel (213), and the outlet of the vertical channel (231) is connected to the starting end of the spiral channel (213). The separation cylinder (21) has a hydrophilic coating (216) on the inner wall of the spiral flow channel (213) and a cooling component (4) corresponding to the hydrophilic coating (216) on the outer wall. The cooling component (4) includes a sealing jacket layer (41), a refrigeration system (42), a temperature control valve (43), and a delivery pump body (44). The sealing jacket layer (41) wraps around the outer wall of the spiral flow channel (213). The separation cylinder (21) is also provided with a flow guiding structure (5) for guiding liquid transport. The inner wall of the spiral channel (213) is provided with a spiral inner groove (215). The hydrophilic coating (216) is provided in the spiral inner groove (215). The flow guiding structure (5) includes a capillary micro-groove (51) provided at the bottom of the spiral inner groove (215) and a negative pressure adsorption component (52) provided at the bottom of the separation cylinder (21) and communicating with the capillary micro-groove (51).

2. The spunlace nonwoven fabric energy-saving fan system according to claim 1, characterized in that, The ratio of the inner diameter of the silencer (3) to the ventilation section of the air outlet of the fan body (1) is 1.2-1.4; multiple sets of diversion pipes (232) are arranged at intervals along the axial direction on the conveying pipeline (23), and the ratio of the inner diameter of the diversion pipe (232) to the inner diameter of the vertical flow channel (231) is 0.08-0.

1.

3. The spunlace nonwoven energy-saving fan system according to claim 1, characterized in that, The bottom of the separator (21) is provided with a liquid collection tank (214), and a drainage structure is provided in the liquid collection tank (214). The drainage structure includes a drain pipe (24) provided on the outer side of the bottom of the separator (21), a filter ring (25) provided corresponding to the drain pipe (24), and a baffle ring (26) provided on the top of the filter ring (25). The side wall of the filter ring (25) is provided with a plurality of filter through holes (251). The separator (21) has a guide surface (2141) that is inclined downward toward the filter ring (25) in the liquid collection tank (214).

4. The spunlace nonwoven fabric energy-saving fan system according to claim 1, characterized in that, The negative pressure adsorption assembly (52) includes an adsorption drive (521), a vacuum pipe (522) connecting the adsorption drive (521) and the capillary microchannel (51), a hydrophobic isolation net (523) disposed in the vacuum pipe (522), and a drain valve body (524) disposed in the vacuum pipe (522). A negative pressure chamber (5221) is formed between the hydrophobic isolation net (523) and the drain valve body (524). The bottom of the capillary microchannel (51) corresponds to the hydrophobic isolation net (523).

5. The spunlace nonwoven fabric energy-saving fan system according to claim 4, characterized in that, The negative pressure chamber (5221) has several honeycomb cavities arranged in an array. The upper and lower openings of the honeycomb cavities correspond to the hydrophobic isolation net (523) and the drain valve body (524) respectively. The drain valve body (524) includes a balancing valve for balancing the internal and external air pressure and a drain solenoid valve for draining.

Images