Automatic drain valve

Abstract

The present invention discloses an automatic drain valve, including a valve body, a valve stem, an elastomer and a water-stopping rubber pad. A drainage cavity is provided inside the valve body, and a water inlet hole for connecting a water tank and the drainage cavity is provided on the top. The valve stem is provided on the top of the valve body, and the bottom end of the valve stem extends into the drainage cavity and can move up and down. The water-stopping rubber pad is fixedly mounted on the bottom of the valve stem and seals with the water inlet hole. The elastomer is provided on the top of the valve body and is in a compressed state, and the upper end of the elastomer presses upward against the valve stem. The automatic drain valve of the present invention has a compact overall structure and a small size. The purpose of automatic drainage of a water tank can be achieved through a purely mechanical structure. The production and use costs are low, the maintenance is simple, the valve stem is safe and reliable, and the service life is long.

Description

Technical Field

[0001] The invention relates to the field of sanitary ware, and in particular to an automatic drain valve. 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 solenoid valve, thereby realizing the drainage of the drain valve. When the microcomputer fails or the power is cut off, the drain valve loses its function and is in a normally open or normally closed state. The most 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, which causes the entire drain valve to become larger in size and requires more space. Therefore, it is necessary to design an automatic drain valve that does not require electricity, has a compact structure, and works reliably. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide an automatic drain valve which is small in size, compact in structure and reliable in operation.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] An automatic drain valve comprises a valve body, a valve stem, an elastic body and a water-stopping rubber pad. A drainage cavity is provided inside the valve body, and a water inlet hole for connecting a water tank and the drainage cavity is provided on the top. The valve stem is provided on the top of the valve body, and the bottom end of the valve stem extends into the drainage cavity and can move up and down. The water-stopping rubber pad is fixedly installed on the bottom of the valve stem and seals with the water inlet hole. The elastic body is provided on the top of the valve body and is in a compressed state, and the upper end of the elastic body presses upward against the valve stem.

[0006] Furthermore, a guide tube is sleeved on the outer side of the lower part of the valve stem, and the guide tube is fixed to the top of the water inlet hole through a plurality of support rods. A limiting step is provided at the lower part of the inner wall of the guide tube, and an annular abutment portion is provided on the outer wall of the valve stem above the limiting step. The elastic body is provided between the outer wall of the valve stem and the inner wall of the guide tube, and the lower part of the elastic body abuts against the limiting step, and the upper part abuts against the annular abutment portion.

[0007] Furthermore, it also includes a bottom plate, which is fixed to the bottom of the valve stem, and the water-stop rubber pad is fixedly installed on the top of the bottom plate.

[0008] Wherein, a connecting portion is vertically fixed on the top of the bottom plate, and the connecting portion is threadedly connected to the bottom of the valve stem.

[0009] In one embodiment, the valve stem is a solid structure.

[0010] In another embodiment, an overflow channel is opened inside the valve stem along the axis and completely penetrates the valve stem, the connecting portion and the bottom plate.

[0011] Wherein, an overflow assembly for sealing the overflow channel is provided at the bottom of the overflow channel. The overflow assembly includes a guide column provided at the axis of the bottom of the overflow channel, an overflow bottom plate horizontally fixed to the bottom of the guide column, an overflow sealing rubber pad installed above the overflow bottom plate and used to seal the bottom of the overflow channel, and an overflow spring sleeved on the outside of the guide column and pressing upward against the guide column.

[0012] Furthermore, a first annular plate is fixedly arranged at the bottom of the overflow bottom plate along the edge of the overflow channel, and the top of the overflow sealing rubber pad is sealed with the bottom of the first annular plate. A lug is arranged at the center of the first annular plate for the guide column to pass through, and the side of the lug is fixedly connected to the inner wall of the first annular plate through a plurality of connecting columns. A buckle is fixedly connected to the upper part of the guide column, and the lower part of the overflow spring abuts against the lug, and the upper part abuts against the buckle.

[0013] Furthermore, a second annular plate is fixedly provided at the bottom of the top plate of the valve body along the edge of the water inlet hole, and the top of the water-stopping rubber pad is sealed with the bottom of the second annular plate.

[0014] Furthermore, a counterweight cylinder with an opening at the top is installed on the upper part of the valve stem, and a plurality of drainage holes are opened on the bottom plate of the counterweight cylinder along the circumferential direction.

[0015] Preferably, in order to achieve adjustable counterweight height, a connecting pipe for the valve stem to pass through is fixedly provided at the central axis of the counterweight cylinder, an internal thread is provided on the inner wall surface of the connecting pipe, and an external thread matching the internal thread is provided on the outer wall surface of the valve stem.

[0016] Preferably, an annular water baffle plate sealed and connected with the drainage hole is fixed inside the counterweight cylinder, a water-passing gap is provided on the side of the annular water baffle plate, an adjusting rod which can rotate along the axis and is used to adjust the drainage speed is installed inside the annular water baffle plate, a drainage channel is provided at the lower part of the adjusting rod, a drainage port for connecting the water-passing gap and the drainage channel is provided on the side wall of the adjusting rod, and the opening area of ​​the drainage port gradually decreases along the side wall of the adjusting rod.

[0017] Furthermore, a sealing rubber gasket for sealingly cooperating with the wall surface of the water tank is fixedly installed on the bottom of the valve body.

[0018] Furthermore, a locking assembly for fixing with the bottom of the water tank is installed at the bottom of the drainage cavity, and the locking assembly includes a fixing rod, a screw and a U-shaped hook. The fixing rod is transversely fixed to the bottom of the drainage cavity, and a mounting hole for the screw to pass through is provided on the fixing rod. The U-shaped hook is arranged below the valve body and is threadedly connected with the screw.

[0019] Furthermore, the valve body includes a base body and a mounting cover snapped onto the base body, a sealing rubber gasket is provided at the connection between the mounting cover and the base body, a plurality of protrusions are fixedly provided along the circumferential direction at the same height on the side wall of the base body, and a plurality of fixed grooves for snap-fitting with the protrusions are opened on the side wall of the mounting cover.

[0020] Preferably, the elastic body is a metal spring or a rubber spring.

[0021] The present invention has the following beneficial effects:

[0022] 1. No electricity is required, and the purpose of automatic drainage of the water tank can be achieved through a purely mechanical structure. It has a compact structure, small size, reliable operation, simple maintenance, low production and use costs, and a long service life.

[0023] 2. By setting a counterweight cylinder with adjustable upper and lower positions, the drainage volume of the automatic drain valve can be controlled by controlling the position height of the counterweight cylinder on the valve stem. The operation is simple, convenient and practical.

[0024] 3. By installing an adjusting rod in the drain hole of the counterweight cylinder, the drain speed of the counterweight cylinder can be controlled by rotating the adjusting rod, thereby controlling the drainage volume of the automatic drain valve.

[0025] 4. The base body and the mounting cover are connected by fixed slots and protrusions, which makes assembly easy and the structure stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the automatic drain valve of Example 1.

[0027] Figure 2 for Figure 1 Exploded diagram of parts.

[0028] Figure 3 for Figure 1 Schematic diagram of the internal structure.

[0029] Figure 4 for Figure 3 A partial enlarged schematic diagram of part A.

[0030] Figure 5 A schematic diagram of the three-dimensional structure of the installation cover.

[0031] Figure 6 This is a usage status diagram of the automatic drain valve of Example 1.

[0032] Figure 7 It is a schematic diagram of the automatic drain valve of the first embodiment when it is in a closed state.

[0033] Figure 8 It is a schematic diagram of the automatic drain valve of the first embodiment when it is in an open state.

[0034] Fig. 9 This is the status diagram of the automatic drain valve when the water level in the water tank drops.

[0035] Fig.10 This is the status diagram of the automatic drain valve when the water level in the water tank gradually rises but does not exceed the counterweight cylinder.

[0036] Fig.11 This is the state diagram of the automatic drain valve when the water level in the tank exceeds the top of the valve stem and overflows.

[0037] Fig.12 It is a schematic diagram of the structure of the automatic drain valve of the second embodiment.

[0038] Fig.13 for Fig.12 Schematic diagram of the internal structure.

[0039] Fig.14 for Fig.13 A partial enlarged schematic diagram of part B.

[0040] Fig.15 Schematic diagram of the internal structure of the automatic drain valve of Example 3.

[0041] Fig.16 for Fig.15 A partial enlarged schematic diagram of part C in the middle.

[0042] Fig.17 It is a schematic diagram of the three-dimensional structure of the adjustment rod in the third embodiment.

[0043] Fig.18 It is a schematic diagram of the three-dimensional structure of the counterweight cylinder in Example 3.

[0044] Fig.19 This is an exploded view of the parts of the automatic drain valve of Example 4.

[0045] Fig. 20 Schematic diagram of the internal structure of the automatic drain valve of Example 4.

[0046] Fig.21 for Fig. 20 A partial enlarged schematic diagram of part D in the middle.

[0047] Fig. 22Schematic top view of the overflow bottom plate of the fourth embodiment.

[0048] Fig.23 This is a schematic diagram of the automatic drain valve of the fourth embodiment in a closed state.

[0049] Fig.24 This is a schematic diagram of the automatic drain valve of the fourth embodiment in an open state.

[0050] Main component symbol description: 1. Valve body; 10. Drainage cavity; 100. Sealing pad; 101. Water inlet hole; 102. Second annular plate; 11. Base body; 110. Protrusion; 12. Mounting cover; 120. Fixed slot; 2. Valve stem; 20. Guide tube; 200. Support rod; 201. Limiting step; 202. Annular abutment; 203. Overflow channel; 204. Guide column; 205. Overflow bottom plate; 206. Overflow sealing pad; 20 7. Overflow spring; 208. First annular plate; 209. Ear; 210. Connecting column; 211. Buckle; 21. Bottom plate; 22. Connecting part; 3. Elastomer; 4. Water-stopping rubber pad; 5. Water tank; 6. Counterweight cylinder; 60. Drain hole; 61. Connecting pipe; 62. Annular water baffle; 620. Water-passing gap; 71. Fixing rod; 710. Mounting hole; 72. Screw; 73. U-shaped hook; 8. Adjusting rod; 80. Drain channel; 81. Drain port. DETAILED DESCRIPTION

[0051] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0052] Embodiment 1

[0053] like Figure 1-5 As shown, an automatic drain valve includes a valve body 1, a valve stem 2, an elastic body 3 and a water-stopping rubber pad 4. A drain cavity 10 is provided inside the valve body 1, and a water inlet hole 101 for connecting the water tank 5 and the drain cavity 10 is provided on the top. A sealing rubber pad 100 for sealing with the wall of the water tank 5 is fixedly installed at the bottom of the valve body 1. The valve stem 2 is arranged at the top of the valve body 1, and the bottom end of the valve stem 2 extends into the drain cavity 10 and can move up and down. A guide tube 20 is sleeved on the outer side of the lower part of the valve stem 2. The guide tube 20 is fixed to the top of the water inlet hole 101 through a plurality of support rods 200, and the guide tube 20 is concentric with the water inlet hole 101. A limiting step 201 is provided at the lower part of the inner wall of the guide tube 20, and an annular abutment portion 202 is provided on the outer wall of the valve stem 2 above the limiting step 201. The elastic body 3 is arranged between the outer wall of the valve stem 2 and the inner wall of the guide tube 20 and is in a compressed state, with the lower part of the elastic body 3 abutting against the limiting step 201 and the upper part abutting against the annular abutting portion 202. The elastic body 3 is preferably a metal spring or a rubber spring.

[0054] A second annular plate 102 is fixedly provided at the bottom of the top plate of the valve body 1 along the edge of the water inlet hole 101, a bottom plate 21 is fixedly provided at the bottom of the valve stem 2, and a water-stop rubber pad 4 is fixedly installed on the top of the bottom plate 21 and seals with the bottom of the second annular plate 102. A connecting portion 22 is vertically fixedly provided at the top of the bottom plate 21, and the connecting portion 22 is threadedly connected to the bottom of the valve stem 2. An overflow channel 203 is provided inside the valve stem 2 along the axis, which completely penetrates the valve stem 2, the connecting portion 22 and the bottom plate 21.

[0055] A counterweight cylinder 6 with an opening at the top is installed on the upper part of the valve stem 2, and a plurality of drain holes 60 are opened on the bottom plate of the counterweight cylinder 6 along the circumferential direction. A connecting pipe 61 for the valve stem 2 to pass through is fixedly arranged at the central axis of the counterweight cylinder 6, and an internal thread is opened on the inner wall surface of the connecting pipe 61, and an external thread matching the internal thread is opened on the outer wall surface of the valve stem 2.

[0056] A locking assembly for fixing with the bottom of the water tank 5 is installed at the bottom of the drainage chamber 10, and the locking assembly includes a fixing rod 71, a screw 72 and a U-shaped hook 73. The fixing rod 71 is transversely fixed to the bottom of the drainage chamber 10, and a mounting hole 710 for the screw 72 to pass through is provided on the fixing rod 71. The U-shaped hook 73 is arranged below the valve body 1 and is threadedly connected with the screw 72.

[0057] The valve body 1 includes a base body 11 and a mounting cover 12 snapped onto the base body 11. A sealing rubber gasket 100 is provided at the connection between the mounting cover 12 and the base body 11. A plurality of protrusions 110 are fixedly provided along the circumferential direction at the same height on the side wall of the base body 11. A plurality of fixed slots 120 for snapping with the protrusions 110 are opened on the side wall of the mounting cover 12.

[0058] like Figure 6 The figure shows a schematic diagram of the automatic drain valve of this embodiment when it is installed inside the water tank 5 together with the toilet drain valve and the water inlet valve.

[0059] like Figure 7 The schematic diagram of the automatic drain valve of this embodiment is shown in the closed state. The water tank 5 is normally filled with water, the overall gravity of the weight cylinder 6, the valve stem 2, the water stop rubber pad 4, the bottom plate 21, and the connecting part 22 is G1, the elastic body 3 is in a compressed state and generates an elastic force F1, and the pressure of the water pressure on the water stop rubber pad 4 is F2. When F1>G1+F2, the automatic drain valve is in the closed state.

[0060] like Figure 8The figure shows a schematic diagram of the automatic drain valve of this embodiment in an open state. When other devices of the water tank 5 are opened to drain, the water level drops. When the water level is lower than the drain hole 60 of the counterweight cylinder 6, the counterweight cylinder 6 plays a role of storing water and generates gravity G2. The overall gravity of the counterweight cylinder 6, the valve stem 2, the water-stopping rubber pad 4, the bottom plate 21, and the connecting part 22 is G1. The elastic body 3 is in a compressed state and generates an elastic force F3. The pressure of the water pressure on the water-stopping rubber pad 4 is F4. When G1+G2+F4>F3, the automatic drain valve is in an open state.

[0061] like Fig. 9 The figure shows the state of the automatic drain valve when the water level in the water tank drops. When other devices in the water tank 5 are turned on to drain, the water level continues to drop, and the water storage capacity of the weight cylinder 6 also drops, generating gravity G3. The overall gravity of the weight cylinder 6, valve stem 2, water stop rubber pad 4, bottom plate 21, and connecting part 22 is G1. The elastic body 3 is in a compressed state and generates elastic force F5. The pressure of the water pressure on the water stop rubber pad 4 is F6. When F5>G1+G3+F6, the automatic drain valve is in a closed state.

[0062] like Fig.10 The figure shows the state of the automatic drain valve when the water level in the water tank gradually rises but does not exceed the counterweight cylinder. When the water inlet device of the water tank 5 starts to take in water, the water level rises, and the counterweight cylinder 6 has no water storage capacity. The overall gravity of the counterweight cylinder 6, the valve stem 2, the water stop rubber pad 4, the bottom plate 21, and the connecting part 22 is G1. The elastic body 3 is in a compressed state and generates an elastic force F1. The pressure of the water pressure on the water stop rubber pad 4 is F7. When F1>G1+F7, the automatic drain valve is in a closed state.

[0063] like Fig.11 The figure shows the state of the automatic drain valve when the water level in the water tank exceeds the top of the valve stem and overflows. When the water inlet device of the water tank 5 does not stop water and continues to inlet water, the water tank 5 will overflow, and the overall gravity of the weight cylinder 6, the valve stem 2, the water stop rubber pad 4, the bottom plate 21, and the connecting part 22 is G1. The elastic body 3 is in a compressed state and generates an elastic force F1. The pressure of the water pressure on the water stop rubber pad 4 is F8. When F1>G1+F8, the automatic drain valve is in a closed state. Excess water is discharged from the overflow channel 203 to achieve overflow.

[0064] Embodiment 2

[0065] like Figure 12-14 As shown, the difference between this embodiment and the first embodiment is that the valve stem 2 is a solid structure. The rest of the structure and principle of this embodiment are the same as those of the first embodiment.

[0066] Embodiment 3

[0067] like Figure 15-18As shown, the difference between this embodiment and the first embodiment is that: an annular water baffle plate 62 is fixedly provided inside the counterweight cylinder 6 and is in sealed communication with the water leakage hole 60, and a water-passing gap 620 is provided on the side of the annular water baffle plate 62. An adjusting rod 8 that can rotate along the axis and is used to adjust the water leakage speed is installed inside the annular water baffle plate 62, a water leakage channel 80 is provided at the lower part of the adjusting rod 8, and a water leakage port 81 is provided on the side wall of the adjusting rod 8 to connect the water-passing gap 620 and the water leakage channel 80. The opening area of ​​the water leakage port 81 gradually decreases along the side wall of the adjusting rod 8.

[0068] In this embodiment, the draining speed of the weight cylinder 6 can be controlled by rotating the adjusting rod 8, thereby controlling the drainage volume of the automatic drain valve, and the drainage volume of the automatic drain valve can be controlled by the position height of the weight cylinder 6 on the valve stem 2. The rest of the structure and principle of this embodiment are the same as those of the first embodiment.

[0069] Embodiment 4

[0070] like Figure 19-22 As shown, the difference between this embodiment and the third embodiment is that an overflow assembly for sealing the overflow channel 203 is provided at the bottom. The overflow assembly includes a guide column 204 provided at the bottom axis of the overflow channel 203, an overflow bottom plate 205 horizontally fixed at the bottom of the guide column 204, an overflow sealing rubber pad 206 installed above the overflow bottom plate 205 and used to seal the bottom of the overflow channel 203, and an overflow spring 207 sleeved on the outside of the guide column 204 and upwardly against the guide column 204. A first annular plate 208 is fixedly provided at the bottom of the overflow bottom plate 205 along the edge of the overflow channel 203, and the top of the overflow sealing rubber pad 206 is sealed with the bottom of the first annular plate 208. A connection ear 209 for the guide column 204 to pass through is provided at the center of the first annular plate 208, and the side of the connection ear 209 is fixedly connected to the inner wall of the first annular plate 208 through a plurality of connecting columns 210. A buckle 211 is fixedly connected to the upper part of the guide column 204, and the lower part of the overflow spring 207 abuts against the receiving ear 209, and the upper part abuts against the buckle 211. The rest of the structure of this embodiment is the same as that of the third embodiment.

[0071] like Fig.23 As shown, when the water inlet device of the water tank 5 does not stop water and continues to inlet water, the water tank 5 will overflow. The overall gravity of the guide column 204, the overflow bottom plate 205 and the overflow sealing rubber pad 206 is G4, the overflow spring 207 is in a compressed state, generating an elastic force F9, and the pressure of the water pressure on the overflow sealing rubber pad 206 is F10. When F9>G4+F10, the overflow assembly is in a closed state.

[0072] like Fig.24As shown, when the pressure F11+G4 exerted by the water pressure on the overflow sealing rubber pad 206 is greater than the elastic force F12 generated by the overflow spring 207, the overflow assembly opens and water flows into the base to achieve overflow. The rest of the principles of this embodiment are the same as those of the third embodiment.

[0073] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An automatic drain valve, characterized in that: It comprises a valve body, a valve stem, an elastic body, a water-stopping rubber pad and a bottom plate, wherein a drainage cavity is provided inside the valve body, and a water inlet hole for connecting a water tank and the drainage cavity is provided on the top, the valve stem is arranged on the top of the valve body, the bottom end of the valve stem extends into the drainage cavity and can move up and down, the water-stopping rubber pad is fixedly mounted on the bottom of the valve stem and is sealed with the water inlet hole, the elastic body is arranged on the top of the valve body and is in a compressed state, and the upper end of the elastic body presses upward against the valve stem; the bottom plate is fixed on the bottom of the valve stem, the water-stopping rubber pad is fixedly mounted on the top of the bottom plate, a connecting portion is vertically fixedly arranged on the top of the bottom plate, and the connecting portion is threadedly connected to the bottom of the valve stem; An overflow channel is provided inside the valve stem along the axis line, which completely penetrates the valve stem, the connecting part and the bottom plate; an overflow assembly for sealing the overflow channel is provided at the bottom of the overflow channel, and the overflow assembly includes a guide column provided at the axis line of the bottom of the overflow channel, an overflow bottom plate horizontally fixed to the bottom of the guide column, an overflow sealing rubber pad installed above the overflow bottom plate and used for sealing the bottom of the overflow channel, and an overflow spring sleeved on the outside of the guide column and pressing upward against the guide column; A sealing rubber pad for sealing with the wall surface of the water tank is fixedly installed at the bottom of the valve body.

2. An automatic drain valve according to claim 1, characterized in that: A guide tube is sleeved on the outer side of the lower part of the valve stem, and the guide tube is fixed to the top of the water inlet hole through a plurality of support rods. A limiting step is provided on the lower part of the inner wall of the guide tube, and an annular abutting portion is provided on the outer wall of the valve stem above the limiting step. The elastomer is arranged between the outer wall of the valve stem and the inner wall of the guide tube, and the lower part of the elastomer abuts against the limiting step, and the upper part abuts against the annular abutting portion.

3. An automatic drain valve according to claim 1, characterized in that: A first annular plate is fixedly provided at the bottom of the overflow bottom plate along the edge of the overflow channel, and the top of the overflow sealing rubber pad is sealed with the bottom of the first annular plate. An ear is provided at the center of the first annular plate for the guide column to pass through, and the side of the ear is fixedly connected to the inner wall of the first annular plate through a plurality of connecting columns. A buckle is fixed to the upper part of the guide column, and the lower part of the overflow spring abuts against the ear, and the upper part abuts against the buckle.

4. An automatic drain valve according to claim 1, characterized in that: A second annular plate is fixedly provided at the bottom of the top plate of the valve body along the edge of the water inlet hole, and the top of the water-stopping rubber pad is sealed and matched with the bottom of the second annular plate.

5. An automatic drain valve according to claim 1, characterized in that: A counterweight cylinder with an opening at the top is installed on the upper part of the valve stem, and a water leakage hole is opened on the bottom plate of the counterweight cylinder.

6. An automatic drain valve as claimed in claim 5, characterized in that: A connecting pipe for the valve stem to pass through is fixedly arranged at the central axis of the counterweight cylinder, an internal thread is arranged on the inner wall surface of the connecting pipe, and an external thread matching the internal thread is arranged on the outer wall surface of the valve stem.

7. An automatic drain valve as claimed in claim 5, characterized in that: An annular water baffle plate sealed and connected with the drainage hole is fixed inside the counterweight cylinder, a water-passing gap is provided on the side of the annular water baffle plate, an adjusting rod which can rotate along the axis and is used to adjust the drainage speed is installed inside the annular water baffle plate, a drainage channel is provided at the lower part of the adjusting rod, a drainage port for connecting the water-passing gap and the drainage channel is provided on the side wall of the adjusting rod, and the opening area of ​​the drainage port gradually decreases along the side wall of the adjusting rod.

8. An automatic drain valve as claimed in claim 1, characterized in that: A locking assembly for fixed connection with the bottom of the water tank is installed at the lower part of the drainage chamber, and the locking assembly includes a fixing rod, a screw and a U-shaped hook. The fixing rod is transversely fixed to the bottom of the drainage chamber, and a mounting hole for the screw to pass through is opened on the fixing rod. The U-shaped hook is arranged below the valve body and is threadedly connected to the screw.

9. An automatic drain valve as claimed in claim 1, characterized in that: The valve body includes a base body and a mounting cover snapped onto the base body, a sealing rubber gasket is provided at the connection between the mounting cover and the base body, a plurality of protrusions are fixedly provided along the circumferential direction at the same height on the side wall of the base body, and a plurality of fixed grooves for snap-fitting with the protrusions are opened on the side wall of the mounting cover.

10. An automatic drain valve according to any one of claims 1 to 9, characterized in that: The elastic body is a metal spring or a rubber spring.

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