Automatic drain valve

Abstract

The present invention discloses an automatic drainage valve, comprising a valve body (1), a transverse movement mechanism, a longitudinal movement mechanism, and a lower end plate (9); the valve body (1) is a hollow structure with openings at the upper end, the lower end, and the left end; the lower end plate (9) is arranged in the valve body (1) near the outlet at the lower end of the valve body, and a drainage hole is provided at the center of the lower end plate (9); the transverse movement mechanism penetrates into the interior of the valve body (1) from the left end opening of the valve body (1), and the transverse movement mechanism can move transversely relative to the valve body (1) along the axis of the left end opening of the valve body (1); the longitudinal movement mechanism is arranged in the interior of the valve body (1) and can move longitudinally along the axis of the upper and lower end openings of the valve body (1) under the action of the transverse movement mechanism. The automatic drainage valve of the present invention does not require power supply, has no compressed air loss, has a compact structure, works reliably, and can be used in a high-cold environment.

Description

Technical Field

[0001] The invention relates to an air source processing element, in particular to an automatic drain valve used for air source processing, belonging to the field of pneumatic technology. Background Art

[0002] The existing automatic drain valves are mainly divided into electromagnetic and mechanical types according to the different drive types. The electromagnetic automatic drain valve relies on electromagnetic drive. The opening and closing of the drain valve is controlled by the microcomputer to gain and lose power of the electromagnetic valve, thereby realizing the drainage of the drain valve. The drain valve relies on microcomputer control when draining water. When the microcomputer fails or loses power, the automatic drainage of the drain valve cannot be realized. The opening and closing of the drain valve is set by the switch time set by the program. When the drain valve is opened without water accumulation, it is easy to cause the loss of compressed air. The common mechanical automatic drain valve is the float type drain valve. When the water reaches a certain water level in the drain valve, the buoyancy of the float is greater than the opening pressure of the valve port, and the drain port is opened to drain. When the buoyancy of the float is less than the opening pressure of the valve port, the drain port is closed. Due to the setting of the float, the structure is large in size, and the water accumulated in the drain valve cannot be completely drained. Especially in a high cold environment, if the water is not discharged in time, the water will freeze into ice cubes, which will cause the action of the drain valve to fail and affect the drainage of the drain valve. Therefore, it is urgent to design an automatic drain valve that does not require electricity, has no compressed air loss, has a compact structure, works reliably, and can be used in a high-cold environment.

[0003] The Chinese utility model patent No. 201620500946.9 discloses an automatic drain valve, which includes a cylindrical valve body, the upper end of the valve body is the water inlet end, the lower end of the valve body is the water outlet end, the outer side of the valve body is provided with a plurality of air inlets connected to the inner cavity of the valve body, an annular sealing groove is provided in the valve body, the air inlet is provided from the outer wall of the valve body to the lower groove wall of the annular sealing groove, an annular sealing gasket is provided in the annular sealing groove, the inner edge of the annular sealing gasket extends out of the annular sealing groove, a spring is provided in the water outlet end of the valve body, the spring acts on the lower end of the annular sealing gasket and makes the annular sealing gasket located on the upper side of the annular sealing groove, when water enters the valve body, the annular sealing gasket overcomes the elastic force of the spring and moves to the lower side of the annular sealing groove and closes the air inlet. This drain valve can achieve automatic drainage, but due to its structural characteristics, it is inevitable that there will be a small amount of residue. Summary of the invention

[0004] A first aspect of the present invention provides an automatic drain valve, which includes a valve body, in which a transverse movement mechanism, a longitudinal movement mechanism and a lower end plate are installed; the transverse movement mechanism and the longitudinal movement mechanism cooperate with each other, the valve body is a hollow structure with openings at the upper end, the lower end and the left end, the lower end plate is arranged in the valve body near the lower end outlet of the valve body, and the center of the lower end plate has a drainage hole; the transverse movement mechanism penetrates into the interior of the valve body from the left end opening of the valve body, and the transverse movement mechanism can move transversely relative to the valve body along the axis of the left end opening of the valve body; the longitudinal movement mechanism is arranged in the interior of the valve body and can move longitudinally along the axis of the upper and lower end openings of the valve body under the action of the transverse movement mechanism.

[0005] Preferably, the longitudinal moving mechanism includes a valve core, and the bottom of the valve core also includes a rubber ring; a spring I is mounted on the outer side of the lower part of the valve core, and the bottom of the valve core has a protruding column, which is mounted in the drainage hole of the lower end plate, and a hemispherical rubber ring is mounted on the outer side of the protruding column, and the rubber ring is located between the longitudinal moving mechanism and the lower end plate.

[0006] Preferably, the left end opening of the valve body is a circular hole, and the lateral movement mechanism includes: a guide rod, a spring II, and a spring seat; the guide rod is installed laterally inside the valve body, and the cross-sectional area of ​​the left side is larger than the cross-sectional area of ​​the right side, and the top of the upper protruding part includes at least one inclined surface, and the spring seat is a hollow cylindrical seat with one end open, and an annular boss is provided at a predetermined position on the outer surface of the cylinder, and one end on the right side of the annular boss of the spring seat is sleeved in the left end opening of the valve body, and a spring II is installed between the spring seat and the guide rod.

[0007] More preferably, the upper end opening of the valve body is a circular hole, the valve core includes a first truncated cone at the bottom, a second truncated cone above the first truncated cone, and a cylinder above the second truncated cone, the first truncated cone, the second truncated cone, and the cylinder are integrally formed, the diameter of the first truncated cone is greater than the diameter of the second truncated cone, the height of the first truncated cone is less than the height of the second truncated cone, the bottom of the first truncated cone has a protruding column, the lower part of the cylinder has a slot parallel to the generatrix direction of the cylinder, the slot passes through the cylinder from left to right, and the top surface of the slot is a circular arc surface protruding downward. The guide rod of the lateral movement mechanism passes through the cylindrical slot of the valve core horizontally, and the upper protruding part of the guide rod contacts the circular arc surface of the slot.

[0008] Furthermore, the outer side surfaces of the integrally formed cylinder and the second truncated cone have a plurality of evenly distributed longitudinal grooves.

[0009] Preferably, the upper outer edge of the lower end plate has a circle of concave platform, and a sealing ring III is installed at the concave platform to enhance the sealing performance between the lower end plate and the lower part of the valve body.

[0010] Preferably, the valve body has a protruding portion inside for limiting the second truncated cone of the valve core, and a spring I is installed below the protruding portion. The other end of the spring I is connected to the side of the second truncated cone. The spring I is used to make the protruding portion of the guide rod in close contact with the arc-shaped upper surface of the groove.

[0011] Preferably, a groove is provided at the lower outlet of the valve body, in which a retaining spring is installed. The retaining spring is used to fix the lower end plate in the valve body after the lower end plate is installed in the valve body.

[0012] Preferably, a first groove is provided on the outer side of the right end of the guide rod of the lateral moving mechanism, and a sealing ring II is arranged in the first groove; a second groove is provided on the outer side of the left end of the guide rod, and a sealing ring IV is arranged in the second groove; the sealing rings II and IV are used to enhance the sealing performance between the guide rod and the valve body; the right end of the valve body includes a through hole for easy connection with the air.

[0013] The working principle of the automatic drain valve provided by the present invention is:

[0014] When in use, the upper port of the valve body is connected to the drain port of the pneumatic system through threads and sealed with a sealing ring I to prevent leakage at the connection between the drain port of the pneumatic system and the valve body. The upper port of the valve body is connected to the drain port of the pneumatic system, and the lower port of the valve body faces downward. When there is no compressed air at the upper port or there is compressed air at the upper port and water submerges the guide rod, the guide rod of the lateral moving mechanism moves to the right along the axis of the left end opening of the valve body by relying on the force of spring II until it reaches the rightmost end of the valve core. At this time, the highest point of the inclined surface of the protruding part on the upper side of the guide rod contacts the arc-shaped upper surface of the groove of the valve core, and the valve core overcomes the force of spring I and moves upward, so that the rubber ring is separated from the upper surface of the lower end plate, and the water in the drain valve flows out from the drain hole of the lower end plate along the longitudinal groove of the valve core. At this time, the drain valve is in an open state. When there is compressed air at the upper port and the guide rod is not submerged in water, the compressed air fills the valve core cavity. Since the cross-sectional area on the left side of the guide rod is larger than that on the right side, under the action of air of the same pressure, the thrust on the left side of the guide rod is greater than that on the right side, and the guide rod moves leftward along the axis of the left end opening of the valve body. Under the action of spring I, the slotted arc-shaped upper surface of the valve core moves downward along the inclined surface of the protruding part on the upper side of the guide rod until the rubber ring is completely fitted with the upper surface of the lower end plate. At this time, the drain valve is in a closed state.

[0015] The automatic drain valve of the present invention does not require electricity, has no compressed air loss, has a compact structure, works reliably, and can be used in a very cold environment.

[0016] A second aspect of the present invention is to provide a method for opening and closing an automatic drain valve, comprising:

[0017] Step a. Connect the upper port of the valve body to the drain port of the pneumatic system, with the lower port of the valve body facing downward. When there is no compressed air in the upper port or there is compressed air in the upper port and the guide rod 5 is submerged in water, the guide rod 5 of the lateral movement mechanism moves rightward along the axis of the left end opening of the valve body 1 by the force of the spring 12 until it reaches the rightmost end of the valve core 1.

[0018] Step b. The highest point of the inclined surface of the protruding part on the upper side of the guide rod 5 contacts the arc-shaped upper surface 26 of the slot 25 of the valve core 3, so that the valve core 3 overcomes the downward force of the spring 6 and moves upward, thereby separating the rubber ring 7 from the upper surface of the lower end plate 8, and the water in the drain valve flows downward along the longitudinal groove 27 of the valve core 3, and then flows out from the drain hole of the lower end plate 9, achieving the purpose of drainage. At this time, the drain valve is in an open state;

[0019] Step c. When there is compressed air at the upper port and the guide rod 5 is not submerged in water, the compressed air fills the valve core cavity. The cross-sectional area on the left side of the guide rod 5 is larger than that on the right side. Under the same air pressure, the pressure on the left side of the guide rod 5 is larger than that on the right side. Therefore, the guide rod 5 moves leftward along the axis of the left end opening of the valve body 1.

[0020] Step d. The arc-shaped upper surface of the slot 25 of the valve core 3 moves downward along the inclined surface of the upper protruding portion of the guide rod 5 under the downward elastic force of the spring 6 until the rubber ring 7 is completely in contact with the upper surface of the lower end plate 9, thereby closing the drain valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic cross-sectional structure diagram of a preferred embodiment of an automatic drain valve according to the present invention in a draining state;

[0022] Figure 2 for Figure 1 A schematic cross-sectional view of the embodiment in a closed state;

[0023] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the valve core 3 in the illustrated embodiment;

[0024] Figure 4 for Figure 3 A schematic structural diagram of the valve core 3 at another angle is shown;

[0025] Figure 5 is a schematic cross-sectional structure diagram of another preferred embodiment of an automatic drain valve according to the present invention in a closed state;

[0026] Figure 6 yes Figure 5 The schematic cross-sectional structure diagram of the embodiment shown in the open and draining state:

[0027] Figure 1 - Figure 6 The meanings of the numbers are:

[0028] 1 valve body 2 sealing ring I 3 valve core 4 sealing ring II 5 guide rod 6 spring I 7 rubber ring 8 sealing ring III 9 lower end plate 10 retaining ring 11 sealing ring IV 12 spring II

[0029] 13 spring seat 21 first truncated cone 22 second truncated cone 23 cylinder 24 protruding column 25 slot 26 arc-shaped upper surface 27 longitudinal groove. DETAILED DESCRIPTION

[0030] Embodiment 1.1: An automatic drain valve comprises a valve body 1, a transverse moving mechanism, a longitudinal moving mechanism, and a lower end plate 9; the valve body 1 is a hollow structure with openings at the upper end, the lower end, and the left end; the lower end plate 9 is arranged inside the valve body 1 near the outlet at the lower end of the valve body, and the center of the lower end plate 9 has a drain hole; the transverse moving mechanism penetrates into the interior of the valve body 1 from the left end opening of the valve body 1, and the transverse moving mechanism can move transversely relative to the valve body 1 along the axis of the left end opening of the valve body 1; the longitudinal moving mechanism is arranged inside the valve body 1 and can move longitudinally along the axis of the upper and lower end openings of the valve body 1 under the action of the transverse moving mechanism.

[0031] like Figure 1 As shown, the longitudinal moving mechanism includes a valve core 3, a spring I 6, and a rubber ring 7; the spring I 6 is sleeved on the outer side of the lower part of the valve core 3, and the bottom of the valve core 3 has a protruding column 24, which is sleeved in the drainage hole of the lower end plate 9, and the outer side of the protruding column 24 is sleeved with a hemispherical rubber ring 7, and the rubber ring 7 is located between the longitudinal moving mechanism and the lower end plate 9.

[0032] like Figure 1 As shown, the left end opening of the valve body 1 is a circular hole, and the lateral movement mechanism includes: a guide rod 5, a spring II12, and a spring seat 13; the guide rod 5 is installed horizontally inside the valve body 1, and the cross-sectional area of ​​the left side thereof is larger than the cross-sectional area of ​​the right side, and the upper protruding part is an inclined surface, and the spring seat 13 is a hollow cylindrical seat with one end open, and an annular boss is provided at a predetermined position on the outer surface of the cylinder, and one end on the right side of the annular boss of the spring seat 13 is sleeved in the left end opening of the valve body 1, and a spring II 12 is installed between the spring seat 13 and the guide rod 5.

[0033] like Figure 1 As shown in , the upper end opening of the valve body 1 is a circular hole, such as Figure 3As shown in , the valve core 3 includes a first truncated cone 21 at the bottom, a second truncated cone 22 located above the first truncated cone 21, and a cylinder 23 located above the second truncated cone 22. The first truncated cone 21, the second truncated cone 22, and the cylinder 23 are integrally formed. The diameter of the first truncated cone 21 is greater than the diameter of the second truncated cone 22. The height of the first truncated cone 21 is 1 / 4 of the height of the second truncated cone 22. The bottom of the first truncated cone 21 has a protruding column 24. The lower part of the cylinder 23 has a groove 25 perpendicular to the axial direction of the cylinder 23. The groove 25 passes through the cylinder 23 from left to right, and the upper surface of the groove 25 is a circular arc-shaped upper surface 26 protruding downward. As shown in Figure 1 and 2 As shown in the figure, the guide rod 5 of the lateral movement mechanism passes through the slot 25 of the cylinder 23 of the valve core 3, and the upper protruding portion of the guide rod 5 contacts the arc-shaped upper surface 26 of the slot 25. The upper protruding portion includes two inclined surfaces, and when draining water, the vertices of the two inclined surfaces are located at the lower center of the arc-shaped upper surface 26.

[0034] Furthermore, if Figure 4 As shown in FIG. 1 , the outer side surfaces of the cylinder 23 and the second truncated cone 22 formed as one body have a plurality of evenly distributed longitudinal grooves 27 .

[0035] Preferably, the upper outer edge of the lower end plate 9 has a circle of concave platform, and a sealing ring III 8 is installed at the concave platform to enhance the sealing performance between the lower end plate 9 and the lower part of the valve body 1.

[0036] Preferably, the valve body 1 has a protruding portion inside for limiting the second truncated cone 22 of the valve core 3, and a spring I 6 is installed below the protruding portion. The other end of the spring I 6 is connected to the side of the second truncated cone 22. The spring I 6 is used to make the protruding portion of the guide rod 5 in close contact with the arc-shaped upper surface 26 of the groove 25.

[0037] Preferably, a groove is provided at the lower outlet of the valve body 1 , in which a retaining spring 10 is installed. The retaining spring 10 is used to fix the lower end plate 9 in the valve body 1 after the lower end plate 9 is installed in the valve body 1 .

[0038] Preferably, a first groove is provided on the outer side of the right end of the guide rod 5 of the lateral movement mechanism, and a sealing ring II 4 is arranged in the first groove; a second groove is provided on the outer side of the left end of the guide rod 5, and a sealing ring IV 11 is arranged in the second groove; the sealing ring II4 and the sealing ring IV 11 are used to enhance the sealing performance between the guide rod 5 and the valve body 1; the right end of the valve body 1 includes a through hole for easy connection with the air.

[0039] The working principle of the automatic drain valve provided by the present invention is:

[0040] When in use, the upper port of the valve body 1 is connected to the drain port of the pneumatic system through threads, and sealed by the sealing ring 12 to prevent leakage at the connection between the drain port of the pneumatic system and the valve body 1. Figure 1 As shown, the upper port of the valve body 1 is connected to the drain port of the pneumatic system, and the lower port of the valve body 1 faces downward. When there is no compressed air at the upper port or there is compressed air at the upper port and the guide rod 5 is submerged in water, the guide rod 5 of the lateral movement mechanism moves rightward along the axis of the left end opening of the valve body 1 by the force of the spring II 12 until it reaches the rightmost end of the valve core 1. At this time, the highest point of the inclined surface of the protruding part of the upper side of the guide rod 5 contacts the arc-shaped upper surface 26 of the slot 25 of the valve core 3. The valve core 3 overcomes the force of the spring I 6 and moves upward, so that the rubber ring 7 is separated from the upper surface of the lower end plate 8. The water in the drain valve flows out from the drain hole of the lower end plate 9 along the longitudinal groove 27 of the valve core 3. At this time, the drain valve is in an open state. Figure 2 As shown, when there is compressed air at the upper port and the water does not submerge the guide rod 5, the compressed air fills the valve core cavity. Since the cross-sectional area on the left side of the guide rod 5 is larger than that on the right side, under the action of air of the same pressure, the pressure on the left side of the guide rod 5 is greater than that on the right side, and the guide rod 5 moves leftward along the axis of the left end opening of the valve body 1. The arc-shaped upper surface 26 of the slot 25 of the valve core 3 moves downward along the inclined surface of the protruding part on the upper side of the guide rod 5 under the action of the spring 1 6 until the rubber ring 7 is completely fitted with the upper surface of the lower end plate 9. At this time, the drain valve is in a closed state.

[0041] Embodiment 1.2: An automatic drain valve, same as embodiment 1.1, except that Figure 5 , Figure 6 As shown, the outer side wall of the upper opening of the valve body 1 is conical, and the conical outer side wall can be tightly connected to the drain port of the pneumatic system, and a good sealing effect can be achieved even without a sealing ring I.

[0042] Embodiment 2.1: A method for opening and closing an automatic drain valve, comprising:

[0043] Step a. Connect the upper port of the valve body to the drain port of the pneumatic system, with the lower port of the valve body facing downward. When there is no compressed air in the upper port or there is compressed air in the upper port and the guide rod 5 is submerged in water, the guide rod 5 of the lateral movement mechanism moves rightward along the axis of the left end opening of the valve body 1 by the force of the spring 12 until it reaches the rightmost end of the valve core 1.

[0044] Step b. The highest point of the inclined surface of the protruding part on the upper side of the guide rod 5 contacts the arc-shaped upper surface 26 of the slot 25 of the valve core 3, so that the valve core 3 overcomes the downward force of the spring 6 and moves upward, thereby separating the rubber ring 7 from the upper surface of the lower end plate 8, and the water in the drain valve flows downward along the longitudinal groove 27 of the valve core 3, and then flows out from the drain hole of the lower end plate 9, achieving the purpose of drainage. At this time, the drain valve is in an open state;

[0045] Step c. When there is compressed air at the upper port and the guide rod 5 is not submerged in water, the compressed air fills the valve core cavity. The cross-sectional area on the left side of the guide rod 5 is larger than that on the right side. Under the same air pressure, the pressure on the left side of the guide rod 5 is larger than that on the right side. Therefore, the guide rod 5 moves leftward along the axis of the left end opening of the valve body 1.

[0046] Step d. The arc-shaped upper surface of the slot 25 of the valve core 3 moves downward along the inclined surface of the upper protruding portion of the guide rod 5 under the downward elastic force of the spring 6 until the rubber ring 7 is completely in contact with the upper surface of the lower end plate 9, so that the drain valve is in a closed state. Steps a and b are performed in sequence to open the drain valve, or steps c and d are performed in sequence to close the drain valve.

[0047] Compared with the automatic drain valve in the prior art, the automatic drain valve described in the above embodiment has the following outstanding advantages and effects:

[0048] (1) The upper port of the valve body 1 is connected to the drain port of the pneumatic system through a threaded connection and is sealed by a sealing ring 12, which can prevent leakage at the connection between the drain port of the pneumatic system and the valve body 1 and has a good sealing effect;

[0049] (2) The sealing ring II 4 and the sealing ring IV 11 installed in the grooves at the left and right ends of the guide rod 5 can prevent the leakage of compressed air in the cavity of the valve body 1 and have a good sealing effect;

[0050] (3) The small holes on the left end surface of the spring seat 13 and the right end surface of the valve body 1 are connected to the atmosphere, which allows the guide rod 5 to move left and right more smoothly;

[0051] (4) The automatic drain valve can automatically drain water when there is no compressed air or water fills the guide rod 5, which can prevent water from freezing into ice in a very cold environment, causing the drain valve to rupture or drain failure.

[0052] (5) The automatic drain valve has no electrical control and float structure, and has the advantages of compact structure and reliable operation.

Claims

1. An automatic drain valve, comprising a valve body (1), a lateral moving mechanism, a longitudinal moving mechanism, and a lower end plate (9); the valve body (1) is a hollow structure with openings at the upper end, the lower end, and the left end, and is characterized in that: The lower end plate (9) is arranged inside the valve body (1) near the lower end outlet of the valve body, and the center of the lower end plate (9) has a drainage hole; the lateral movement mechanism penetrates into the interior of the valve body (1) from the left end opening of the valve body (1), and the lateral movement mechanism can move laterally relative to the valve body (1) along the axis of the left end opening of the valve body (1); the longitudinal movement mechanism is arranged inside the valve body (1) and can move longitudinally along the axis of the upper and lower end openings of the valve body (1) under the action of the lateral movement mechanism; the longitudinal movement mechanism includes a valve core (3), a spring I (6), and a rubber ring (7); the lower outer sleeve of the valve core (3) The bottom of the valve core (3) is provided with a protruding column (24), which is sleeved in the drainage hole of the lower end plate (9); a hemispherical rubber ring (7) is sleeved on the outer side of the protruding column (24), and the rubber ring (7) is located between the longitudinal movement mechanism and the lower end plate (9); the transverse movement mechanism comprises a guide rod (5), a spring II (12), and a spring seat (13); the guide rod (5) is transversely installed inside the valve body (1), the cross-sectional area on the left side is larger than the cross-sectional area on the right side, and the protruding part on the upper side is an inclined surface; the spring seat (13) is a hollow cylindrical seat with one end open, and the outer surface of the cylindrical seat is An annular boss is provided at a predetermined position, one end of the annular boss of the spring seat (13) is sleeved in the left end opening of the valve body (1), and a spring II (12) is installed between the spring seat (13) and the guide rod (5); the valve core (3) comprises a first truncated cone (21) located at the bottom, a second truncated cone (22) located above the first truncated cone (21), and a cylinder (23) located above the second truncated cone (22); the diameter of the first truncated cone (21) is greater than the diameter of the second truncated cone (22), the height of the first truncated cone (21) is less than the height of the second truncated cone (22), and the bottom of the first truncated cone (21) has a protruding column (23) 4), a groove (25) perpendicular to the axial direction of the cylinder (23) is provided in the middle and lower part of the cylinder (23), the groove (25) passes through the cylinder (23) from left to right, and the upper surface of the groove (25) is a circular arc-shaped upper surface (26) protruding downward; the guide rod (5) of the lateral movement mechanism passes through the groove (25) of the cylinder (23) of the valve core (3) laterally, and the upper side of the guide rod (5) has a protruding portion, and the protruding portion is in contact with the circular arc-shaped upper surface (26) of the groove (25); the outer side surfaces of the cylinder (23) and the second truncated cone (22) have a plurality of evenly distributed longitudinal grooves (27).

2. The automatic drain valve according to claim 1, characterized in that: The upper outer edge of the lower end plate (9) has a circle of concave platform, and a sealing ring III (8) is installed at the concave platform to enhance the sealing performance between the lower end plate (9) and the lower part of the valve body (1).

3. The automatic drain valve according to claim 1, characterized in that: The valve body (1) has a protruding portion inside for limiting the second truncated cone (22) of the valve core (3), a spring I (6) is installed below the protruding portion, the other end of the spring I (6) is connected to the side of the second truncated cone (22), and the spring I (6) is used to make the protruding portion of the guide rod (5) closely contact with the arc-shaped upper surface (26) of the slot (25).

4. The automatic drain valve according to claim 3, characterized in that: A groove is provided at the lower outlet of the valve body (1), in which a retaining spring (10) is installed. The retaining spring (10) is used to fix the lower end plate (9) in the valve body (1) after the lower end plate (9) is installed in the valve body (1).

5. The automatic drain valve according to claim 1, characterized in that: The right end of the guide rod (5) of the lateral movement mechanism has a first groove on the outside, and a sealing ring II (4) is arranged in the first groove. The left end of the guide rod (5) has a second groove on the outside, and a sealing ring IV (11) is arranged in the second groove. The sealing ring II (4) and the sealing ring IV (11) are used to enhance the sealing performance between the guide rod (5) and the valve body (1). The right end of the valve body (1) includes a through hole for easy communication with the air.

6. A method for opening and closing the automatic drain valve according to claim 1, characterized in that: include Step a. Connect the upper port of the valve body to the drain port of the pneumatic system, with the lower port of the valve body facing downward. When there is no compressed air in the upper port or there is compressed air in the upper port and the guide rod (5) is submerged in water, the guide rod (5) of the lateral movement mechanism moves rightward along the axis of the left end opening of the valve body (1) by the force of the spring II (12) until it reaches the rightmost end of the valve body. Step b. The highest point of the inclined surface of the protruding portion on the upper side of the guide rod (5) contacts the arc-shaped upper surface (26) of the slot (25) of the valve core (3), so that the valve core (3) overcomes the downward force of the spring I (6) and moves upward, thereby separating the rubber ring (7) from the upper surface of the lower end plate (9), and the water in the drain valve flows downward along the longitudinal groove (27) of the valve core (3), and then flows out from the drain hole of the lower end plate (9), achieving the purpose of drainage. At this time, the drain valve is in an open state; Step c. When compressed air is present at the upper port and the guide rod (5) is not submerged in water, the compressed air fills the valve core cavity. The cross-sectional area on the left side of the guide rod (5) is larger than that on the right side. Under the same air pressure, the pressure on the left side of the guide rod (5) is larger than that on the right side. Therefore, the guide rod (5) moves leftward along the axis of the left end opening of the valve body (1); Step d. The arc-shaped upper surface of the slot (25) of the valve core (3) moves downward along the inclined surface of the upper protruding portion of the guide rod (5) under the downward elastic force of the spring I (6) until the rubber ring (7) is completely in contact with the upper surface of the lower end plate (9), thereby closing the drain valve; Execute steps a and b in sequence to open the drain valve, or execute steps c and d in sequence to close the drain valve, or execute steps a, b, c, and d in sequence to drain water and then close the drain valve.

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