Automatic water drain valve

Abstract

The automatic water drain valve comprises a water drain valve body, an air cylinder, a valve element, a valve rod and a piston, the valve element, the valve rod and the piston are connected, the valve element corresponds to a valve hole of the water drain valve body, the air cylinder is arranged on the water drain valve body, the piston is arranged in the air cylinder, an air connecting opening is formed in the air cylinder, and an elastic element used for pushing the piston to move towards the air connecting opening is arranged in the air cylinder. A control cavity is formed between the piston and the air connecting opening in the air cylinder, and a pressure relief control unit communicated with the control cavity is arranged on the air cylinder. The automatic water drain valve is reasonable in structural design, the pressure relief control unit is additionally arranged on the basis of the pneumatic stop valve to achieve the purpose of automatically opening the water valve in a delayed mode, therefore, the function of automatic water drain control is achieved, and the automatic water drain valve is simple in structure, stable, reliable and free of circuit control.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to an automatic water drain valve. Background Art

[0002] At present, when sanitation vehicles are used in winter, drainage is generally done manually. A manual ball valve is added to the water system to drain water in winter. After the operation is completed, the ball valve is opened to drain water. When the staff forgets to open the drain valve, it is easy to cause the water system to freeze, resulting in damage to the water components.

[0003] Existing control valves cannot be automatically controlled with a time delay and mostly require manual control; for example, Chinese patent CN206036243U discloses a single-spring piston pneumatic two-position cut-off valve, which includes a cylinder, a piston, a valve body, a valve stem, a valve core and a spring, wherein the piston is arranged in the cylinder, the valve core is arranged in the valve body, and the piston and the valve core are respectively fixedly arranged at both ends of the valve stem, and the spring is sleeved on the valve stem; the spring is arranged between the piston and the valve body; the air intake of the cylinder needs to be manually controlled to control the on-off of the entire valve. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model provides an automatic drain valve to achieve the purpose of delaying the on-off draining of the automatic control valve.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] The automatic drain valve comprises a drain valve body, a cylinder, and a connected valve core, a valve stem and a piston. The valve core is arranged corresponding to the valve hole of the drain valve body, the cylinder is arranged on the drain valve body, the piston is arranged in the cylinder, an air connection port is arranged on the cylinder, an elastic element for pushing the piston to move toward the air connection port is arranged in the cylinder, a control chamber is formed in the cylinder between the piston and the air connection port, and a pressure relief control unit connected to the control chamber is arranged on the cylinder.

[0007] Further:

[0008] The cylinder comprises a cylinder body and a cylinder cover arranged on the cylinder body. The cylinder body is fixed on the valve body of the drain valve, and the air inlet is arranged on the cylinder cover.

[0009] A through hole for the valve stem to pass through is provided at the bottom of the cylinder, a sealing ring is provided at the through hole, and the elastic element is a spring, which is provided between the piston and the through hole.

[0010] The pressure relief control unit includes a breathable rubber ring with air holes and a knob for squeezing the breathable rubber ring. A mounting hole is provided on the side of the cylinder corresponding to the control chamber, and an exhaust hole is provided corresponding to the mounting hole. The breathable rubber ring is provided in the mounting hole corresponding to the exhaust hole, and the knob cooperates with the mounting hole.

[0011] A one-way valve for external air intake into the control chamber is provided at the air inlet.

[0012] An annular groove is arranged at the bottom of the mounting hole, and a breathable rubber ring is arranged in the annular groove.

[0013] A protruding portion is provided on the side of the cylinder, and a mounting hole is provided in the protruding portion.

[0014] The knob and the mounting hole are threadedly matched.

[0015] A pressing plate is arranged in the mounting hole between the inner end of the knob and the breathable rubber ring.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The automatic drain valve has a reasonable structural design. By adding a pressure relief control unit on the basis of the pneumatic cut-off valve, the purpose of delaying the automatic opening of the water valve is achieved, thereby realizing the function of automatic drainage control. It has a simple structure, is stable and reliable, and does not require circuit control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a brief description of the contents and symbols in the drawings of this specification:

[0019] Figure 1 This is a schematic diagram of the valve structure of the utility model.

[0020] Figure 2 It is a schematic diagram of the pressure relief control unit of the utility model.

[0021] In the figure:

[0022] 1. Drain valve body, 2. Valve core, 3. Valve stem, 4. Sealing ring, 5. Spring, 6. Piston, 7. Cylinder head, 8. Check valve, 9. Cylinder, 901. Exhaust hole, 10. Porous rubber ring, 11. Pressure plate, 12. Knob. DETAILED DESCRIPTION

[0023] The specific implementation of the utility model will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, the automatic drain valve includes a drain valve body 1, a cylinder 9, a pressure relief control unit, and a connected valve core 2, a valve stem 3 and a piston 6; the valve core is arranged corresponding to the valve hole of the drain valve body, and the drain valve is controlled by the valve core. The cylinder 9 is arranged on the drain valve body, and the pressure relief control unit is arranged on the cylinder body of the cylinder to form an integrated valve structure.

[0025] The piston 6 is arranged in the cylinder 9, and there are three sealing rings between the piston and the inner wall of the cylinder, which ensure the sealing between the upper chamber and the lower chamber of the cylinder, and it can slide in the cylinder; an air inlet is provided on the cylinder, and an elastic element for pushing the piston to move toward the air inlet is provided in the cylinder. A control chamber is formed in the cylinder between the piston and the air inlet, and a pressure relief control unit b connected to the control chamber is provided on the cylinder.

[0026] Furthermore, the cylinder includes a cylinder body and a cylinder cover 7 arranged on the cylinder body, the cylinder body is fixed on the drain valve body, and the air inlet is arranged on the cylinder cover; the cylinder cover and the cylinder body are connected by a detachable structure for easy assembly.

[0027] A one-way valve 8 is provided at the air inlet for external air intake into the control chamber, which reduces leakage caused by the sealing of the external air circuit system and ensures stable and reliable operation. Furthermore, a pneumatic one-way valve is integrated in the cylinder head, and the top of the pneumatic one-way valve is connected to the air circuit connector and connected to the air source a. The internal pneumatic one-way valve can ensure that the gas can only enter from the outside, and the internal gas cannot escape from it.

[0028] The two ends of the valve stem are connected to the piston and the valve core respectively. A through hole is provided at the bottom of the cylinder for the valve stem to pass through. A sealing ring 4 is provided at the through hole. The elastic element is a spring 5. The spring is provided between the piston and the through hole. The main function of the spring is to push the piston upward. A groove is provided at the lower part of the piston, and the upper end of the spring is located in the groove, with a compact structure.

[0029] The pressure relief control unit includes a breathable rubber ring with air holes and a knob 12 for squeezing the breathable rubber ring. A mounting hole is provided on the side of the cylinder corresponding to the control chamber, and an exhaust hole 901 is provided corresponding to the mounting hole. The breathable rubber ring is provided in the mounting hole corresponding to the exhaust hole, and the knob cooperates with the mounting hole.

[0030] The breathable rubber ring is a porous rubber ring 10, which is made of rubber material and has a large number of breathable holes inside. When squeezed, the holes shrink and deform, and have good sealing performance; an annular groove is provided at the bottom of the installation hole, and the breathable rubber ring is arranged in the annular groove.

[0031] An extension portion is provided on the side of the cylinder, and a mounting hole is provided in the extension portion. The knob and the mounting hole are threadedly matched. A pressure plate 11 is provided in the mounting hole between the inner end of the knob and the breathable rubber ring. A convex ring is provided on the edge of the pressure plate corresponding to the rubber ring. The force of the inner end of the knob acts on the rubber ring through the pressure plate, and the force is evenly distributed.

[0032] The utility model changes the structure of the pneumatic shut-off valve, makes adjustments to the original pneumatic shut-off valve cylinder structure, and adds a set of one-way valves on the cylinder head to reduce leakage caused by the sealing of the air path system; at the same time, a pressure relief control unit is added to the cylinder housing to control the gas leakage rate in the cylinder, thereby achieving the control of the water valve closing time. When the vehicle is working normally, the chassis air source supplies air to the automatic drain valve, and the piston moves downward under the action of the gas to close the water valve. When the chassis stops working, the chassis stops supplying air, and the gas in the cylinder slowly leaks through the pressure relief control unit. When the air pressure in the cylinder drops to a certain level, the piston moves upward under the action of the spring, and the water valve opens.

[0033] The specific control principle is:

[0034] When the chassis is started, the air source supplies air to the water valve normally; the gas enters the upper part of the cylinder through the one-way valve. When the air pressure reaches 0.5Mpa, the piston moves downward, and the valve core moves downward to close the water valve. Since the air source continues to supply air to the upper part of the cylinder, the valve core keeps the water valve in the closed position, and the water system operates normally. When the chassis is powered off, the air source stops supplying air to the water valve, the gas in the upper part of the cylinder remains relatively sealed, and the gas escapes outward from the pressure relief control unit. When the air pressure in the upper part of the cylinder drops to 0.5Mpa, the spring gradually exerts force upward, pushing the piston upward, driving the valve core upward, the water valve opens, and the water system starts to drain water. The amount of the knob screwed in can be adjusted as needed to control the delayed opening time of the water valve. When the knob is screwed in, the pressure plate moves inward, squeezing the porous rubber ring, the air permeability of the porous rubber ring decays, the air pressure in the cylinder drops slowly, and the water valve opening time is extended. When the knob is unscrewed, the porous rubber ring gradually recovers, the air permeability is enhanced, the air pressure in the cylinder drops faster, and the water valve opening time is shortened.

[0035] The utility model discloses an automatic water drain valve with reasonable structure design, and achieves the purpose of delaying and automatically opening the water valve by adding a pressure relief control unit on the basis of a pneumatic shut-off valve, thereby realizing the function of automatic water drainage control, and has a simple structure, is stable and reliable, and does not require circuit control.

[0036] The above is only an explanation of the preferred embodiments of the present invention. The above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0037] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An automatic drain valve, comprising a drain valve body, a cylinder, and a connected valve core, a valve stem and a piston, wherein the valve core is arranged corresponding to the valve hole of the drain valve body, the cylinder is arranged on the drain valve body, the piston is arranged in the cylinder, an air inlet is arranged on the cylinder, and an elastic element for pushing the piston to move toward the air inlet is arranged in the cylinder, characterized in that: A control chamber is formed in the cylinder between the piston and the air inlet, and a pressure relief control unit connected to the control chamber is provided on the cylinder.

2. The automatic drain valve according to claim 1, characterized in that: The cylinder comprises a cylinder body and a cylinder cover arranged on the cylinder body. The cylinder body is fixed on the valve body of the drain valve, and the air inlet is arranged on the cylinder cover.

3. The automatic drain valve according to claim 1, characterized in that: A through hole for the valve stem to pass through is provided at the bottom of the cylinder, a sealing ring is provided at the through hole, and the elastic element is a spring, which is provided between the piston and the through hole.

4. The automatic drain valve according to claim 1, characterized in that: The pressure relief control unit includes a breathable rubber ring with air holes and a knob for squeezing the breathable rubber ring. A mounting hole is provided on the side of the cylinder corresponding to the control chamber, and an exhaust hole is provided corresponding to the mounting hole. The breathable rubber ring is provided in the mounting hole corresponding to the exhaust hole, and the knob cooperates with the mounting hole.

5. The automatic drain valve according to claim 2, characterized in that: A one-way valve for external air intake into the control chamber is provided at the air inlet.

6. The automatic drain valve according to claim 4, characterized in that: An annular groove is arranged at the bottom of the mounting hole, and a breathable rubber ring is arranged in the annular groove.

7. The automatic drain valve according to claim 4, characterized in that: A protruding portion is provided on the side of the cylinder, and a mounting hole is provided in the protruding portion.

8. The automatic drain valve according to claim 4, characterized in that: The knob and the mounting hole are threadedly matched.

9. The automatic drain valve according to claim 8, characterized in that: A pressing plate is arranged in the mounting hole between the inner end of the knob and the breathable rubber ring.

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