Automatic blow-down valve for centrifugal air compressor
By designing an automatic drain valve that combines a float and a ball, the problems of small single-time drainage volume and frequent operation of mechanical drain valves are solved, achieving a larger single-time drainage volume and a higher purification effect, and extending the service life of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 广西华磊新材料有限公司
- Filing Date
- 2025-07-15
- Publication Date
- 2026-06-02
AI Technical Summary
Mechanical automatic drain valves have a small single drainage capacity and frequent operation, resulting in low reliability, frequent failures, and low user trust.
An automatic drain valve, comprising a sludge collection section and an automatic drainage section, was designed. By cooperating with a float and a float ball, buoyancy is used to control drainage, increasing the single drainage volume. A two-stage filtration structure is used to improve the purification effect, prevent water leakage and impurities from entering, and extend the life of the device.
It increases the single-drainage volume, extends the drainage interval, enhances sealing performance, improves the purification effect and service life of the device, and reduces the failure rate.
Smart Images
Figure CN224315520U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drain valve technology, and in particular to an automatic drain valve for centrifugal air compressors. Background Technology
[0002] The automatic drain valve of a centrifugal air compressor is a key component of its compressed air system. It is mainly used to periodically drain condensate, oil, and particulate impurities accumulated in the air tank, dryer, or pipeline to maintain air dryness and equipment operating efficiency.
[0003] Automatic drain valves can be installed in hard-to-reach areas where manual draining is inconvenient, as manual draining is often forgotten, resulting in compressed air being contaminated by condensate. Automatic drain valves effectively solve this problem. The automatic drain valve for air compressors utilizes the air pressure in the compressed air system, connected via a conduit. A pressure relief valve at the top adjusts for a small amount of discharge, keeping the pressure in the drain valve lower than that in the compressed air system. This pushes condensate, sludge, and rust away from the compressed air system.
[0004] Automatic drain valves come in electronic and mechanical types. Electronic drain valves operate on the principle of a solenoid valve controlling the opening and closing of the valve, and the automatic drainage opening time and cycle can be adjusted by setting a switch on the valve. Mechanical drain valves rely on the buoyancy of a float inside the valve to open. When the liquid level in the drain valve rises, the float rises, and the valve opens automatically. However, mechanical drain valves have low single-drain volume and frequent operation, resulting in low reliability, frequent failures, and extremely low user trust. Utility Model Content
[0005] To overcome at least one of the defects described in the prior art, this utility model provides an automatic drain valve for centrifugal air compressors. This solves problems such as small single-pass drainage capacity and frequent operation of mechanical drain valves.
[0006] The technical solution adopted by this utility model to solve its problem is:
[0007] An automatic drain valve for a centrifugal air compressor includes:
[0008] The sludge collection section is equipped with a first sludge collection head and a second sludge collection head.
[0009] An automatic drainage unit, connected to a sludge collection unit via a connecting pipe, includes a housing, a tension spring, and a float. The housing is internally divided into an inlet chamber, an outlet chamber, and an installation chamber. A partition plate is provided between the inlet and outlet chambers, with a water passage hole in the middle of the partition plate. An isolation plate is provided between the outlet and installation chambers, with a connecting hole in the middle of the isolation plate. The float is slidably connected within the water passage hole and the connecting hole. The tension spring is located within the installation chamber, with one end fixedly connected to the bottom of the installation chamber and the other end fixedly connected to the lower end of the float. A sealing plate is provided in the middle of the float, positioned above the water passage hole and blocking it. A float ball is provided at the upper end of the float. The housing is connected to the sludge collection unit via the connecting pipe.
[0010] The above scheme, using the first and second sludge collection heads, can more effectively collect various pollutants generated during air compressor operation. The housing and the sludge collection section are connected by a connecting pipe, allowing condensate water (after removing pollutants) to enter the housing. The float rod passes through the water passage and connecting hole, and can slide within them. A sealing plate in the middle of the float rod normally blocks the water passage, preventing water flow. When there is sufficient water, the float rises due to buoyancy, causing the float rod to move upwards, releasing the sealing plate from the water passage and allowing water to enter the outlet chamber and be discharged. The tension spring ensures that when the water volume decreases or disappears, the float rod automatically resets, resealing the water passage.
[0011] Furthermore, the housing has a water inlet located in the water inlet cavity, which is connected to the dirt collection part through a connecting pipe. The housing also has a water outlet located in the water outlet cavity, which is located at the bottom of the water outlet cavity.
[0012] By implementing the above-mentioned further solutions, placing the outlet at the bottom of the outlet chamber ensures that sewage can be completely discharged, avoiding corrosion caused by residual moisture.
[0013] Furthermore, the upper end of the shell is provided with an expansion cavity, which is connected to the water inlet cavity, and the float is located inside the expansion cavity.
[0014] The above-mentioned further solutions provide a larger space to store condensate, increasing the single drainage volume and the drainage interval.
[0015] Furthermore, the bottom of the float is provided with a sealing cylinder with an opening at the lower end. The connection end of the tension spring and the lower end of the float is located inside the sealing cylinder. The sealing cylinder is slidably connected in the connecting hole, and the outer side of the sealing cylinder is in contact with the inner side of the connecting hole.
[0016] Through the above-mentioned further solutions, the outer side of the sealing cylinder fits into the inner side of the connecting hole, forming a dynamic sealing structure. This can effectively prevent dirt, moisture, or other impurities from entering the installation cavity from the water outlet cavity, ensuring that the tension spring in the installation cavity is not contaminated by water and improving the service life of the tension spring.
[0017] Furthermore, the partition plate is provided with a slot, and the sealing plate can be fitted into the slot, the thickness of the sealing plate being the same as the depth of the slot.
[0018] With the above-mentioned further solution, when the sealing plate is fitted into the slot, since the thickness of the sealing plate is the same as the depth of the slot, the sealing plate can be completely fitted into the slot, forming a tight seal. This effectively prevents water from leaking from the inlet chamber to the outlet chamber, ensuring that the drainage process only occurs when the float moves, thus improving the valve's sealing performance.
[0019] Furthermore, a floating platform is provided on the upper side of the sealing plate. The floating platform is conical, and the bottom diameter of the floating platform is larger than the diameter of the sealing plate.
[0020] Through the aforementioned further solutions, the conical float allows the sealing plate to fit more tightly against the water passage on the partition plate when the water passage is closed. Since the bottom diameter of the float is larger than the diameter of the sealing plate, when the sealing plate is subjected to water pressure, the conical structure of the float further compacts the contact surface between the sealing plate and the water passage, thereby enhancing the sealing effect and preventing water leakage. The structure of the conical float can better disperse the pressure of the water flow on the sealing plate, reducing local stress concentration, lowering the risk of deformation or damage to the sealing plate, and extending its service life. The conical float helps to quickly open the water passage during drainage. When the float rod moves the sealing plate upwards, the inclined structure of the conical float not only reduces the resistance to the float's ascent but also quickly guides the water flow into the outlet chamber, thereby improving drainage efficiency. When the sealing plate is closed, the float can increase the water pressure; when the sealing plate is open, the float can increase the buoyancy of the float rod, thereby increasing the water discharge.
[0021] Furthermore, the water outlet cavity is provided with an auxiliary plate, the auxiliary plate has a sliding hole in the middle that is slidably connected to the float, and the auxiliary plate has a through groove for water to pass through.
[0022] Through the above-mentioned further solutions, the auxiliary plate provides additional support and guidance for the float, ensuring that the float maintains a straight line when moving up and down, and avoiding jamming problems caused by offset or tilt.
[0023] Furthermore, one end of the first sludge collection head is connected to the middle of the sludge collection section, and one end of the second sludge collection head is connected to the end of the sludge collection section. The sludge collection section is provided with a water inlet, which is connected to the water inlet through a connecting pipe. The first sludge collection head, the second sludge collection head, and the water inlet are located on the same longitudinal plane. The first sludge collection head and the second sludge collection head are located in the same direction and face downwards, while the water inlet faces upwards.
[0024] With the above-mentioned further solutions, the downward orientation of the first and second collection heads helps to naturally collect the settled dirt and water by utilizing gravity, thus improving collection efficiency.
[0025] Furthermore, a first intercepting net is provided in the sludge collection section at the midpoint between the first and second sludge collection heads, and the first intercepting net is positioned close to the first sludge collection head. A second intercepting net is provided on the water inlet, and the aperture of the second intercepting net is smaller than that of the first intercepting net.
[0026] Through the above-mentioned further solutions, the first interceptor net is set close to the first collection head, which can initially intercept larger particles and pollutants. The intercepted larger particles and pollutants will settle due to their own weight and thus enter the first collection head, which helps protect the subsequent equipment components from the influence of larger impurities and reduces the risk of blockage. The second interceptor net is set on the water inlet, and its pore size is smaller, which can further intercept fine suspended particles and impurities. The intercepted fine suspended particles and impurities will settle due to their own weight and thus enter the second collection head. Through the two-stage filtration mechanism, the water quality entering the automatic drainage section is ensured to be purer, improving the overall purification effect and extending the service life of the device.
[0027] In summary, the automatic drain valve for centrifugal air compressors provided by this utility model has the following technical effects:
[0028] 1. By using the first and second collection heads, various pollutants generated during the operation of the air compressor can be collected more effectively, improving the overall purification effect and extending the service life of the device.
[0029] 2. The shell and the sludge collection section are connected by a connecting pipe, allowing condensate water (after removing contaminants) to enter the shell. The float rod passes through the water inlet and the connecting hole, and can slide within them. A sealing plate in the middle of the float rod normally blocks the water inlet, preventing water flow. When there is sufficient water, the float rises due to buoyancy, causing the float rod to move upwards, releasing the sealing plate from the water inlet and allowing water to flow into the outlet chamber and then out. The tension spring ensures that the float rod automatically resets and re-closes the water inlet when the water volume decreases or disappears.
[0030] 3. The upper end of the shell is provided with an expansion cavity, which provides a larger space to store condensate, increases the single drainage volume, and increases the drainage interval time.
[0031] 4. A floating platform is provided on the upper side of the sealing plate. The floating platform is conical. When the sealing plate is not opened, the floating platform can increase the water pressure. When the sealing plate is opened, the floating platform can increase the buoyancy of the float, thereby increasing the water discharge. Attached Figure Description
[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0033] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0034] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;
[0035] Figure 3 For the present utility model Figure 2 A magnified schematic diagram of the structure at point A in the middle.
[0036] In the diagram: 1. Sludge collection section; 11. First sludge collection head; 12. Second sludge collection head; 13. Connecting pipe; 14. Water inlet; 15. First intercepting net; 16. Second intercepting net; 2. Shell; 21. Water inlet chamber; 211. Water inlet; 22. Water outlet chamber; 221. Water outlet; 222. Auxiliary plate; 2221. Sliding hole; 2222. Through groove; 23. Mounting cavity; 24. Divider plate; 241. Water passage hole; 242. Slot; 25. Isolation plate; 251. Connecting hole; 26. Expansion cavity; 3. Float rod; 31. Sealing plate; 311. Floating platform; 32. Float ball; 33. Sealing cylinder; 4. Tension spring. Detailed Implementation
[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0040] Example:
[0041] refer to Figures 1-3 As shown, an automatic drain valve for a centrifugal air compressor includes an automatic drain section. The automatic drain section includes a housing 2, a tension spring 4, and a float 3. The housing 2 is internally divided into an inlet chamber 21, an outlet chamber 22, and an installation chamber 23. A partition plate 24 is provided between the inlet chamber 21 and the outlet chamber 22, and a water passage hole 241 is provided in the middle of the partition plate 24. An isolation plate 25 is provided between the outlet chamber 22 and the installation chamber 23, and a connecting hole 251 is provided in the middle of the isolation plate 25. The float 3 is slidably connected in the water passage hole 241 and the connecting hole 251. The tension spring 4 is located in the installation chamber 23, with one end fixedly connected to the bottom of the installation chamber 23 and the other end fixedly connected to the lower end of the float 3. Next, a sealing plate 31 is provided in the middle of the float rod 3. The sealing plate 31 is located above the water passage hole 241 and blocks the water passage hole 241. A float ball 32 is provided at the upper end of the float rod 3. The float rod 3 passes through the water passage hole 241 and the connecting hole 251 and can slide in it. Under normal conditions, the sealing plate 31 in the middle of the float rod 3 blocks the water passage hole 241 to prevent water from flowing through. When there is enough water, the float ball 32 rises due to buoyancy, which drives the float rod 3 to move upward, release the sealing plate 31 from blocking the water passage hole 241, and allow water to flow into the outlet chamber 22 and then be discharged. The tension spring 4 ensures that when the water volume decreases or disappears, the float rod 3 can automatically reset and re-seal the water passage hole 241.
[0042] It should be noted that the diameter of the water passage hole 241 is larger than the diameter of the float 3, allowing water to enter the water outlet chamber 22 through the water passage hole 241. The diameter of the water passage hole 241 is smaller than the diameter of the sealing plate 31, which can block the water passage hole 241 and prevent water from entering the water outlet chamber 22 through the water passage hole 241.
[0043] The housing 2 has an inlet 211 located in the inlet cavity 21 and an outlet 221 located in the outlet cavity 22. The outlet 221 is located at the bottom of the outlet cavity 22. Placing the outlet 221 at the bottom of the outlet cavity 22 ensures that the sewage can be completely discharged, avoiding corrosion caused by residual moisture.
[0044] The partition plate 24 is provided with a slot 242, and the sealing plate 31 can be fitted into the slot 242. The thickness of the sealing plate 31 is the same as the depth of the slot 242. When the sealing plate 31 is fitted into the slot 242, since the thickness of the sealing plate 31 is the same as the depth of the slot 242, the sealing plate 31 can be completely fitted into the slot 242, forming a tight seal. This effectively prevents water from leaking from the inlet chamber 21 to the outlet chamber 22, ensuring that the drainage process only occurs when the float 3 moves, thus improving the sealing performance of the valve.
[0045] The water outlet chamber 22 is equipped with an auxiliary plate 222. The auxiliary plate 222 has a sliding hole 2221 in the middle that is slidably connected to the float 3. The auxiliary plate 222 has a through groove 2222 for water to pass through. The auxiliary plate 222 provides additional support and guidance for the float 3, ensuring that the float 3 maintains a straight movement when moving up and down, and avoiding jamming problems caused by deviation or tilt.
[0046] refer to Figures 1-3 As shown, the upper end of the shell 2 is provided with an expansion cavity 26, which is connected to the water inlet cavity 21. The float 32 is located in the expansion cavity 26. The expansion cavity 26 provides a larger space to store condensate, increasing the single drainage volume and the drainage interval time.
[0047] refer to Figures 1-3 As shown, the bottom of the float 3 is provided with a sealing cylinder 33, the lower end of the sealing cylinder 33 is open, the connection end of the tension spring 4 and the lower end of the float 3 is located inside the sealing cylinder 33, the sealing cylinder 33 is slidably connected in the connection hole 251, the outer side of the sealing cylinder 33 is in contact with the inner side of the connection hole 251, and the outer side of the sealing cylinder 33 is in contact with the inner side of the connection hole 251, forming a dynamic sealing structure, which can effectively prevent dirt, water or other impurities from entering the installation cavity 23 from the water outlet cavity 22, ensuring that the tension spring 4 in the installation cavity 23 is not contaminated by water, and improving the service life of the tension spring 4.
[0048] It should be noted that the height of the sealing cylinder 33 is greater than the upward distance of the float 3, so that the sealing cylinder 33 can continuously seal the connection hole 251, prevent water from entering the installation cavity 23, keep the installation cavity 23 dry, and improve the service life of the device.
[0049] refer to Figures 1-3As shown, a floating platform 311 is provided on the upper side of the sealing plate 31. The floating platform 311 is conical, and the bottom diameter of the floating platform 311 is larger than the diameter of the sealing plate 31. The conical floating platform 311 allows the sealing plate 31 to fit more tightly against the water passage 241 on the partition plate 24 when the water passage 241 is closed. Since the bottom diameter of the floating platform 311 is larger than the diameter of the sealing plate 31, when the sealing plate 31 is subjected to water pressure, the conical structure of the floating platform 311 will further compact the contact surface between the sealing plate 31 and the water passage 241, thereby enhancing the sealing effect and preventing water leakage. The structure of the conical floating platform 311 can better disperse the water flow on the sealing plate. The pressure of 31 reduces local stress concentration, lowers the risk of deformation or damage to the sealing plate 31, and extends its service life; the conical float 311 helps to quickly open the water passage 241 during drainage. When the float 3 drives the sealing plate 31 to move upward, the inclined structure of the conical float 311 can not only reduce the resistance of the float 311 to rise, but also quickly guide the water flow into the outlet chamber 22, thereby improving drainage efficiency; when the sealing plate 31 is not open, the float 311 can increase the water pressure, and when the sealing plate 31 is open, the float 311 can increase the buoyancy of the float 3, thereby increasing the water discharge.
[0050] refer to Figures 1-3 As shown, it also includes a sludge collection section 1, which is provided with a first sludge collection head 11 and a second sludge collection head 12. One end of the first sludge collection head 11 is connected to the middle of the sludge collection section 1, and one end of the second sludge collection head 12 is connected to the end of the sludge collection section 1. The sludge collection section 1 is provided with a water inlet 14, which is connected to the water inlet 211 through a connecting pipe 13, so that the condensate water after removing pollutants enters the shell 2. The first sludge collection head 11, the second sludge collection head 12 and the water inlet 14 are located on the same longitudinal plane. The first sludge collection head 11 and the second sludge collection head 12 are located in the same direction and face downwards, while the water inlet 14 faces upwards. The downward orientation of the first sludge collection head 11 and the second sludge collection head 12 helps to naturally collect the sedimented dirt and water by gravity, thus improving the collection efficiency.
[0051] refer to Figures 1-3 As shown, the water inlet 14 is located at the top, which can buffer the water flow rate and prevent the water flow rate from being too fast, which would bring a large number of impurities into the housing 2 and affect the service life of the device.
[0052] refer to Figures 1-3As shown, a first intercepting net 15 is located between the first collecting head 11 and the second collecting head 12 within the sludge collection section 1. The first intercepting net 15 is positioned close to the first collecting head 11. A second intercepting net 16 is positioned on the water inlet 14. The aperture of the second intercepting net 16 is smaller than that of the first intercepting net 15. The first intercepting net 15, positioned close to the first collecting head 11, can initially intercept larger particles and pollutants. The intercepted larger particles and pollutants will settle due to their own weight and thus enter the first collecting head 11, helping to protect subsequent equipment components from the influence of larger impurities and reducing the risk of blockage. The second intercepting net 16, positioned on the water inlet 14, has an even smaller aperture and can further intercept fine suspended particles and impurities. The intercepted fine suspended particles and impurities will settle due to their own weight and thus enter the second collecting head 12. Through this two-stage filtration mechanism, the water entering the automatic drainage section is ensured to be purer, improving the overall purification effect and extending the service life of the device.
[0053] The first intercepting net 15 is tilted so that it is positioned above the first collection head 11, allowing impurities intercepted by the first intercepting net 15 to settle into the first collection head 11 by gravity.
[0054] It should be noted that both the first and second sewage collection heads 11 and 12 are equipped with connectors at their ends to the sewage collection section 1, which can be connected to external pipes or switches.
[0055] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. An automatic drain valve for a centrifugal air compressor, characterized in that, include: The sludge collection section (1) is provided with a first sludge collection head (11) and a second sludge collection head (12); An automatic drainage unit is connected to the sewage collection unit (1) via a connecting pipe (13). The automatic drainage unit includes a housing (2), a tension spring (4), and a float (3). The housing (2) is divided into an inlet chamber (21), an outlet chamber (22), and an installation chamber (23). A partition plate (24) is provided between the inlet chamber (21) and the outlet chamber (22). A water passage hole (241) is provided in the middle of the partition plate (24). An isolation plate (25) is provided between the outlet chamber (22) and the installation chamber (23). A connection hole (25) is provided in the middle of the isolation plate (25). 1) The float (3) is slidably connected in the water passage hole (241) and the connecting hole (251). The tension spring (4) is located in the mounting cavity (23). One end of the tension spring (4) is fixedly connected to the bottom of the mounting cavity (23), and the other end is fixedly connected to the lower end of the float (3). The middle part of the float (3) is provided with a sealing plate (31). The sealing plate (31) is located above the water passage hole (241) and blocks the water passage hole (241). The upper end of the float (3) is provided with a float ball (32). The housing (2) is connected to the dirt collection part (1) through the connecting pipe (13).
2. The automatic drain valve for a centrifugal air compressor according to claim 1, characterized in that: The housing (2) is provided with an inlet (211) at the water inlet cavity (21), and the water inlet (211) is connected to the dirt collection part (1) through a connecting pipe (13). The housing (2) is provided with an outlet (221) at the water outlet cavity (22), and the water outlet (221) is located at the bottom of the water outlet cavity (22).
3. The automatic drain valve for a centrifugal air compressor according to claim 1, characterized in that: The upper end of the shell (2) is provided with an expansion cavity (26), which is connected to the water inlet cavity (21), and the float (32) is located inside the expansion cavity (26).
4. The automatic drain valve for a centrifugal air compressor according to claim 1, characterized in that: The bottom of the float (3) is provided with a sealing cylinder (33), the lower end of the sealing cylinder (33) is open, the tension spring (4) and the lower end of the float (3) are located inside the sealing cylinder (33), the sealing cylinder (33) is slidably connected in the connecting hole (251), and the outer side of the sealing cylinder (33) is in contact with the inner side of the connecting hole (251).
5. An automatic drain valve for a centrifugal air compressor according to claim 1, characterized in that: The partition plate (24) is provided with a slot (242), and the sealing plate (31) can be fitted into the slot (242). The thickness of the sealing plate (31) is the same as the depth of the slot (242).
6. An automatic drain valve for a centrifugal air compressor according to claim 5, characterized in that: The sealing plate (31) is provided with a floating platform (311) on the upper side. The floating platform (311) is conical and the bottom diameter of the floating platform (311) is larger than the diameter of the sealing plate (31).
7. An automatic drain valve for a centrifugal air compressor according to claim 1, characterized in that: The water outlet cavity (22) is provided with an auxiliary plate (222), and the auxiliary plate (222) is provided with a sliding hole (2221) in the middle that is slidably connected to the float (3). The auxiliary plate (222) is provided with a through groove (2222) for water to pass through.
8. An automatic drain valve for a centrifugal air compressor according to claim 2, characterized in that: One end of the first sludge collection head (11) is connected to the middle of the sludge collection part (1), and one end of the second sludge collection head (12) is connected to the end of the sludge collection part (1). The sludge collection part (1) is provided with a water inlet (14), and the water inlet (14) is connected to the water inlet (211) through a connecting pipe (13). The first sludge collection head (11), the second sludge collection head (12) and the water inlet (14) are located on the same longitudinal plane. The first sludge collection head (11) and the second sludge collection head (12) are located in the same direction and face downwards, while the water inlet (14) faces upwards.
9. An automatic drain valve for a centrifugal air compressor according to claim 8, characterized in that: The sludge collection section (1) is provided with a first intercepting net (15) located between the first sludge collection head (11) and the second sludge collection head (12). The first intercepting net (15) is located close to the first sludge collection head (11). The water inlet (14) is provided with a second intercepting net (16). The aperture of the second intercepting net (16) is smaller than that of the first intercepting net (15).