Drain valve and air tank

Abstract

The present invention relates to a drain valve and an air storage cylinder. The drain valve comprises: a drain valve body; a first component, a second component, a push rod, a first return spring, a piston, a drain valve switch, a second return spring and a detection joint valve core; wherein the detection joint valve core is arranged inside the drain valve body, the detection joint valve core and the drain valve body are clearance-matched, and the detection joint valve core can move along the axis of the drain valve body; in a first state, the first return spring applies pressure to the push rod to form a sealing fit between the push rod and the first component; the second return spring applies pressure to the end face of the detection joint valve core, and the end face of the detection joint valve core and the drain valve body are sealed through a sixth sealing ring. The above-mentioned drain valve can integrate the functions of the drain valve and the detection joint by arranging the detection joint valve core inside the drain valve body, thereby realizing a drain valve with high functional integration and high space utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle air cylinders, in particular to a water discharge valve and an air cylinder. Background Art

[0002] The working medium of pneumatic brakes is compressed air, which contains large amounts of impurities such as oil and water. If the air handling unit (drying tank) fails, these impurities will accumulate in the air reservoir, reducing the effective volume. Furthermore, these impurities can enter the brake valve through the reservoir and damage it. Therefore, commercial vehicle air brake reservoirs, as storage containers for compressed air, require drain valves to ensure regular drainage.

[0003] Currently, commercial vehicles all have the drain valve located at the bottom of the air reservoir. However, placing it at the bottom affects the vehicle's maneuverability. The driver needs to crawl under the vehicle to drain the water, making it inconvenient. Furthermore, draining the water requires manually pulling the pull ring for a long time until the air reservoir is completely drained. Summary of the Invention

[0004] Based on this, the present application provides a drain valve and an air cylinder that can drain the water in the air cylinder without pulling the pull ring for a long time and without the driver having to crawl under the vehicle to drain the water.

[0005] In a first aspect, the present application provides a drain valve, comprising:

[0006] Drain valve body;

[0007] The first component is arranged inside the drain valve body, and a chamber is provided inside the first component; the drain valve body and the first component are interference fit;

[0008] a second component having an interference fit with the first component;

[0009] A push rod is fitted with a clearance between the first component and the push rod is capable of moving along the axis of the drain valve body in the cavity of the first component;

[0010] a first return spring disposed in the cavity of the first component and between the second component and the push rod;

[0011] The piston is arranged inside the drain valve body, the piston and the push rod are interference fit, and are sealed at the interference fit; the piston and the drain valve body are clearance fit, and a sealing component is provided between the piston and the drain valve body;

[0012] The drain valve switch is used to push the piston and push rod to move along the axis of the drain valve body;

[0013] The detection joint valve core is arranged inside the drain valve body, the detection joint valve core and the drain valve body are in clearance fit, and the detection joint valve core can move along the axis of the drain valve body;

[0014] A second return spring is provided inside the drain valve body and is located between the piston and the valve core of the detection joint;

[0015] In the first state, the first return spring applies pressure to the push rod, forming a sealed fit between the push rod and the first component; the second return spring applies pressure to the end face of the detection joint valve core, and the end face of the detection joint valve core and the drain valve body are sealed through the sixth sealing ring.

[0016] The above-mentioned drain valve can integrate the functions of the drain valve and the detection connector by arranging the detection connector valve core inside the drain valve body, and can be used to connect the air pressure detection equipment, thereby realizing a drain valve with high functional integration and high space utilization.

[0017] In one embodiment, when the drain valve is in the second state, the push rod applies pressure to the first return spring, the first return spring is compressed, and a gap is formed between the push rod and the first component; the second return spring applies pressure to the end face of the valve core of the detection joint, and the end face of the valve core of the detection joint is sealed with the valve body of the drain valve through the sixth sealing ring.

[0018] In one embodiment, when the drain valve is in the third state, the first return spring applies pressure to the push rod, forming a sealing fit between the push rod and the first component; the end face of the detection joint valve core applies pressure to the second return spring, the second return spring is compressed, and a gap is formed between the end face of the detection joint valve core and the valve body of the drain valve.

[0019] In one embodiment, forming a sealing fit between the push rod and the first component includes:

[0020] The second sealing ring is fixed to the push rod through the second groove; the push rod and the end surface of the first component are squeezed and sealed by the second sealing ring;

[0021] The third sealing ring is fixed on the push rod through the third groove; the first gap between the push rod and the first component is sealed by the third sealing ring.

[0022] In one embodiment, the drain valve body is provided with a first hole and a second hole, and the first hole and the second hole are symmetrical about the axis of the drain valve body;

[0023] The piston is provided with a vertical through hole, and the round rod passes through the second hole and is fixed with an interference fit to the upper part of the vertical through hole of the piston;

[0024] The sealing component includes a fourth sealing ring and a fifth sealing ring. The fourth sealing ring is fixed to one side of the piston relative to the through hole through a fourth groove. The fifth sealing ring is fixed to the other side of the piston relative to the vertical through hole through a fifth groove.

[0025] In one embodiment, the drain valve further comprises:

[0026] a snap ring, fixed to the drain valve through the sixth groove;

[0027] The retaining ring has one side limited and fixed by a snap ring, and the other side is fixed in contact with the valve body of the drain valve; the piston is provided with a plurality of axial through holes.

[0028] In one embodiment, the drain valve further comprises:

[0029] The detection connector cap is fixed to the seventh groove through a ring.

[0030] In one embodiment, the drain valve further comprises:

[0031] The drain valve switch is engaged with the drain valve body through the connecting thread;

[0032] The round rod is limited by the second hole;

[0033] The drain valve switch is rotated to move along the thread along the axis of the drain valve body, driving the round rod to move along the axis of the drain valve body, and the round rod drives the piston and the push rod to move along the axis of the drain valve body.

[0034] In a second aspect, the present application further provides an air storage cylinder, comprising:

[0035] an air reservoir body having a bottom, a top, a first end, and a second end;

[0036] The drain valve of any embodiment of the first aspect is provided at the first end or the second end of the gas storage cylinder, and further comprises: a first external thread, through which the drain valve is connected to the gas storage cylinder body; a first sealing ring, which is fixed to the first groove; the drain valve and the gas storage cylinder body are sealed by the first sealing ring;

[0037] Hose, fixed to the drain valve.

[0038] The above-mentioned air cylinder achieves the effects of good vehicle trafficability and convenient water discharge operation by placing the water discharge valve at both ends of the air cylinder instead of placing it at the lowest point of the air cylinder.

[0039] In one embodiment, the second component further includes inverted teeth; the hose is connected to the second component via the inverted teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic cross-sectional view of a drain valve in a first state according to an embodiment of the present application;

[0041] Figure 2 Schematic cross-sectional view of the drain valve in the second state in one embodiment of the present application;

[0042] Figure 3Schematic cross-sectional view of the drain valve in the third state in one embodiment of the present application;

[0043] Figure 4 Schematic diagram of the structure of the gas storage cylinder in one embodiment of the present application;

[0044] Figure 5 This is a schematic structural diagram of a drain valve in one embodiment of the present application;

[0045] Figure 6 Schematic diagram of the structure of the piston in one embodiment of the present application;

[0046] Figure 7 This is another cross-sectional schematic diagram of the third state of the drain valve in one embodiment of the present application. DETAILED DESCRIPTION

[0047] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0053] See Figure 1 , Figure 1 A schematic diagram of a drain valve in a first state in an embodiment of the present application is shown. The drain valve provided in an embodiment of the present application includes:

[0054] The drain valve body 11; the first component 15 is arranged inside the drain valve body 11, and a chamber is provided inside the first component 15; the drain valve body 11 and the first component 15 are interference fit; the second component 13 is interference fit with the first component 15; the push rod 17, the push rod 17 and the first component 15 are clearance fit, and the push rod 17 can move along the axis of the drain valve body 11 in the chamber of the first component 15; the first return spring 14 is arranged in the chamber of the first component 15, located between the second component 13 and the push rod 17; the piston 19 is arranged inside the drain valve body 11, and the piston 19 and the push rod 1 7 interference fit, and sealed at the interference fit; the piston 19 is in clearance fit with the drain valve body 11, and a sealing member is provided between the piston 19 and the drain valve body 11; the drain valve switch 21 is used to push the piston 19 and the push rod 17 to move along the axis of the drain valve body 11; the detection joint valve core 24 is provided inside the drain valve body 11, and the detection joint valve core 24 is in clearance fit with the drain valve body 11, and the detection joint valve core 24 can move along the axis of the drain valve body 11; the second return spring 26 is provided inside the drain valve body 11, located between the piston 19 and the detection joint valve core 24;

[0055] In the first state, the first return spring 14 applies pressure to the push rod 17, forming a sealing fit between the push rod 17 and the first component 15; the second return spring 26 applies pressure to the detection joint valve core end face 241, and the detection joint valve core end face 241 and the drain valve body 11 are sealed through the sixth sealing ring 25.

[0056] Specifically, the push rod 17 and the first component 15 are loosely matched at the first gap 151. For example, the first state may be a non-operating state of the drain valve.

[0057] The drain valve can integrate the functions of the drain valve and the detection connector by setting the detection connector valve core 24 inside the drain valve body 11, and can be used to connect the air pressure detection equipment, thereby realizing a drain valve with high functional integration and high space utilization.

[0058] In one embodiment, see Figure 2 , Figure 2 A schematic diagram illustrates the drain valve in the second state according to an embodiment of the present application. In the second state, the push rod 17 applies pressure to the first return spring 14, compressing the first return spring 14 and creating a gap between the push rod 17 and the first component 15. The second return spring 26 applies pressure to the end face of the test connector valve core 24, creating a seal between the end face of the test connector valve core 24 and the drain valve body 11 via the sixth sealing ring 25.

[0059] For example, the second state is the drain valve's draining state. The drain valve body, first component, second component, push rod, first return spring, piston, drain valve switch, detection connector spool, and second return spring work together to form a drain circuit. In the second state, once the drain valve is opened to drain water, no human intervention is required; once the drain is complete, the drain valve can be closed. In other words, in this embodiment, the drain valve can be opened once, and once draining begins, no human intervention is required; simply wait until the accumulated water has drained and then close the drain valve.

[0060] In one embodiment, see Figure 3 , Figure 3 A schematic diagram illustrates the drain valve in the third state according to an embodiment of the present application. In the third state, the first return spring 14 applies pressure to the push rod 17, creating a seal between the push rod 17 and the first component 15. The end surface of the test connector valve core 24 applies pressure to the second return spring 26, compressing the second return spring 26 and creating a gap between the end surface of the test connector valve core 24 and the drain valve body 11.

[0061] For example, the third state is an air pressure detection state. An air pressure detection circuit is formed by the cooperation of the drain valve body, the first component, the second component, the push rod, the first return spring, the piston, the drain valve switch, the detection joint valve core and the second return spring.

[0062] In one embodiment, forming a sealing fit between the push rod 17 and the first component 15 includes:

[0063] The second sealing ring 16 is fixed to the push rod 17 through the second groove; the push rod 17 and the end face of the first component 15 are squeezed and sealed by the second sealing ring 16; the third sealing ring 18 is fixed to the push rod 17 through the third groove; the first gap 151 between the push rod 17 and the first component 15 is sealed by the third sealing ring 18.

[0064] In the above embodiment, the second sealing ring 16 is fixed to the push rod 17 through the second groove; the push rod 17 and the end surface of the first component 15 are squeezed and sealed by the second sealing ring 16 to ensure the sealing of the water discharge circuit; and the third sealing ring 18 is fixed to the push rod 17 through the third groove; the first gap 151 between the push rod 17 and the first component 15 is sealed by the third sealing ring 18, thereby ensuring that the high-pressure gas in the gas reservoir does not enter the water discharge circuit through this gap.

[0065] In one embodiment, the drain valve body 11 is provided with a first hole 114 and a second hole 115, and the first hole 114 and the second hole 115 are symmetrical about the axis of the drain valve body 11; the piston 19 is provided with a vertical through hole 191, and the round rod 20 passes through the second hole 115 and is fixed with an interference fit with the upper part of the vertical through hole 191 of the piston 19; the sealing component includes a fourth sealing ring 28 and a fifth sealing ring 29, and the fourth sealing ring 28 is fixed to the side of the piston 19 relative to the through hole through the fourth groove, and the fifth sealing ring 29 is fixed to the other side of the piston 19 relative to the vertical through hole 191 through the fifth groove.

[0066] In the above embodiment, the fourth sealing ring 28 and the fifth sealing ring 29 are used to seal the gas cylinder, thereby ensuring that the high-pressure gas in the gas storage cylinder will not be discharged into the atmosphere through the first hole 114 .

[0067] In one embodiment, the drain valve further includes: a retaining ring 27, which is fixed to the drain valve through a sixth groove; a retaining ring 22, one side of which is limited and fixed by the retaining ring 27, and the other side is in contact and fixed with the drain valve body 11; and the piston 19 is provided with a plurality of axial through holes 192.

[0068] Exemplarily, the sixth groove is a groove provided on the drain valve body 11 .

[0069] In the above embodiment, the cooperation between the retaining ring and the clamping ring makes the water discharge circuit and the air pressure detection circuit independent of each other and do not affect each other, thereby avoiding the problem that when the water discharge and the air pressure detection share a circuit, if there is water accumulated in the cylinder, water will be sprayed out of the cylinder when the air pressure is detected, thereby damaging the air pressure detection instrument.

[0070] In one embodiment, the drain valve further includes: a detection joint cap 23 fixed to the seventh groove via a ring 231 .

[0071] Exemplarily, the seventh groove is a groove provided on the drain valve body 11 .

[0072] In one embodiment, the drain valve further includes: a drain valve switch 2, which is threadedly engaged with the drain valve body 11 through the connecting portion 112; a round rod 20, which is limited by the second hole 115; wherein, by rotating the drain valve switch 2, the round rod 20 is driven to move along the axis of the drain valve body 11 along the thread, and the round rod 20 drives the piston 19 and the push rod 17 to move along the axis of the drain valve body 11.

[0073] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of the gas storage cylinder in one embodiment of the present application, and refer to Figure 1The air storage cylinder provided in the present application includes: an air storage cylinder body, the air storage cylinder body having a bottom, a top, a first end, and a second end; a drain valve as in any of the aforementioned embodiments, the drain valve being disposed at the first end or the second end of the air storage cylinder, the drain valve further including: a first external thread 111, the drain valve being connected to the air storage cylinder body via the first external thread 111; a first sealing ring 30, the first sealing ring 30 being fixed in the first groove; the drain valve and the air storage cylinder body being sealed via the first sealing ring 30; and a hose 12, fixed to the drain valve.

[0074] Exemplarily, the hose 12 is a nylon hose that extends into the interior of the air reservoir. Under the action of gravity, the nylon hose naturally droops to the bottom of the air reservoir. Further, the drain valve is installed at the end caps at both ends of the air reservoir, higher than the lowest point of the air reservoir wall.

[0075] The above-mentioned air storage cylinder achieves the effects of good vehicle trafficability and convenient water discharge operation by placing the water discharge valve at the end of the air storage cylinder instead of at the lowest point of the air storage cylinder.

[0076] Furthermore, the present application can be applied to metal gas cylinders, eliminating the opening at the drain valve at the bottom of the cylinder body, thereby improving the strength of the cylinder body and improving space utilization; the present application can also be applied to composite gas cylinders, where the drain valve cannot be placed on the cylinder body and can only be placed at the end. The present application can solve the water drain problem of composite gas cylinders.

[0077] In one embodiment, the second component 13 further includes inverted teeth 131 ; the hose 12 is connected to the second component 13 via the inverted teeth 131 .

[0078] Please refer again Figure 1 , and refer to Figure 5 , Figure 5 This is a three-dimensional diagram of a drain valve in one embodiment of the present application. In one embodiment, the drain valve of the present application is in the first state:

[0079] The drain valve body 11 is connected to the air storage cylinder through a first external thread 111. At the same time, in order to ensure the sealing between the present application and the air storage cylinder, a first sealing ring 30 is provided between the drain valve body 11 and the air storage cylinder for sealing. The first sealing ring 30 is fixed to the first groove at the root of the drain valve body 11; the drain valve body 11 and the first component 15 are fixed by an interference fit in the groove; the hose 12 and the second component 13 are connected and fixed by the inverted teeth 131 on the second component 13; the second component 13 and the first component 15 are fixed by an interference fit, and the second component 13 is fixed by an interference fit. The interference fit must be sealed; the first component 15 and the push rod 17 are clearance-fitted at the first gap 151, and the push rod 17 can move axially along the first component 15; the second sealing ring 16 is fixed to the push rod 17 through the second groove; when the water is not discharged, under the action of the first return spring 14, the push rod 17 and the end face of the first component 15 are squeezed and sealed by the second sealing ring 16 to ensure the sealing of the water discharge circuit; the third sealing ring 18 is fixed to the push rod 17 through the third groove; the first gap 151 that forms the clearance fit is formed by the third sealing ring 18 is sealed to ensure that the high-pressure gas in the air storage cylinder does not enter the water discharge circuit through the gap here; the push rod 17 and the piston 19 are fixed by interference fit, and the interference fit must be sealed; the drain valve body 11 has a first hole 114 and a second hole 115 that are symmetrical up and down; the piston 19 is provided with a vertical through hole 191, and the round rod 20 passes through the second hole 115 and is fixed by interference fit with the upper half of the vertical through hole 191 of the piston 19; the fourth sealing ring 28 and the fifth sealing ring 29 are fixed to the piston 19 through the groove; the piston 19 and the drain valve body 1 1 is a clearance fit, which is sealed by the fourth sealing ring 28 and the fifth sealing ring 29 to ensure that the high-pressure gas in the gas storage cylinder will not be discharged into the atmosphere through the gaps at the second gap 117 and the gaps at the third gap 116 through the first hole 114; the drain valve switch 21 is threaded with the drain valve body 11 through the connection part 112. Rotating the drain valve switch 21 can move left and right along the thread, and at the same time drive the round rod 20 to move left and right. The round rod 20 is limited by the second hole 115, and the round rod 20 can drive the piston 19 and the push rod 17 to move along the axis of the drain valve body 11. Please also refer to Figure 6 , Figure 6 The piston 19 has several axial through holes 192, through which the high-pressure gas in the gas reservoir can be connected to the chamber where the retaining ring 22 is located; the first side of the retaining ring 22 (at Figure 1 The right side is in contact with the drain valve body 11, and the second side (on the Figure 1The left side is in the middle) and is limited and fixed by a snap ring 27, which is fixed by a groove of the drain valve body 11; the detection joint valve core 24 and the drain valve body 11 are clearance-matched and can move along the axis; when the air pressure is not detected, under the action of the second return spring 26, the detection joint valve core end face 241 and the drain valve body 11 are squeezed and sealed by the sixth sealing ring 25 to ensure the sealing of the detection joint circuit; the detection joint cap 23 is made of rubber and is fixed to the groove of the drain valve body 11 by a ring 231; when the air pressure is not detected, the detection joint protective cap 232 is as shown Figure 1 As shown, it is fixed on the drain valve body 11 to prevent dust; the drain valve body 11 has a second external thread 113 for connecting to the air pressure detection equipment.

[0080] Please refer again Figure 2 In one embodiment, the drain valve of the present application is in the second state:

[0081] like Figure 2 When the driver needs to drain the water, he can rotate the drain valve switch 21 to make the drain valve switch 21 move to the left along the thread, thereby driving the round rod 20, the piston 19, and the push rod 17 to the first direction ( Figure 2 The push rod 17 moves in the left direction (in the middle), simultaneously driving the second sealing ring 16, the third sealing ring 18, the fourth sealing ring 28, and the fifth sealing ring 29 to move in the first direction. As the push rod 17 drives the second sealing ring 16 to move leftward, a gap appears between the push rod 17 and the first component 15. Under the action of the high-pressure gas in the air reservoir, the accumulated water in the air cylinder flows sequentially through the interior of the hose 12, the through-hole 132 of the second component, the chamber where the first return spring 14 is located, the gap 152 between the first component 15 and the push rod 17, the first gap 151 between the push rod 17 and the first component 15, the internal passage 171 of the push rod 17, the lower half of the vertical through-hole 191 of the piston 19, and the first oblong hole 114 below the drain valve body 11, and is discharged to the atmosphere. After draining is complete, the drain valve switch 21 is rotated in the opposite direction until the round rod 20 returns to its original position, thereby re-sealing and returning to the first state.

[0082] Please refer again Figure 3 , and refer to Figure 7 , Figure 7 This is another cross-sectional view of the drain valve in the third state in one embodiment of the present application. In one embodiment, when the drain valve of the present application is in the third state:

[0083] like Figure 3When testing the air pressure, remove the test connector cap 23, and the air pressure test device is connected to the drain valve body 11 via the second external thread 113. During the tightening process, the air pressure test device will contact the end face 244 of the test connector valve core 24, and after contact, push the test connector valve core 24 to the left; the test connector valve core 24 moves to the left, driving the sixth sealing ring 25 to the first direction ( Figure 3 (left direction in the middle), a gap 224 appears between the detection joint valve core 24 and the drain valve body 11. Figure 6 , and combined with Figure 3 and Figure 7 At this time, the high-pressure gas in the air storage cylinder can enter the chamber where the second return spring 26 is located through the second gap 117, the axial through hole 192, and the third hole 221 in sequence, and then enter the axial through hole 243 of the detection joint valve core through the gap 224, the second gap 117, and the vertical through hole 242 of the detection joint valve core in sequence; the axial through hole 243 of the detection joint valve core is connected to the air pressure detection equipment, and the high-pressure gas value in the air storage cylinder can be read through the air pressure detection equipment at this time; after the air pressure detection is completed, the air pressure detection equipment is rotated and unscrewed in the opposite direction along the second external thread 113 to complete the sealing again, and then the detection joint cap 23 is reinstalled to prevent dust, covering the end face 244, and returning to the first state.

[0084] In this application, the drain valve is installed at the end caps of the gas cylinder, which is higher than the lowest point of the gas cylinder wall. The vehicle has good passability and the drain operation is convenient. In addition, through a reasonable structural setting, two independent gas circuits are used inside the drain valve, which do not interfere with each other. One circuit is used for draining water, and the other circuit is used for detecting air pressure. This can realize the functions of draining water and detecting air pressure. The drain valve can be opened at one time. When draining water, there is no need for human intervention. Only the accumulated water needs to be drained and the drain valve can be closed at one time. As for the gas cylinder of this application, one end extends into the gas cylinder through a nylon hose. The nylon hose is affected by gravity and droops to the lowest point of the gas cylinder wall. The high-pressure gas in the gas cylinder can drain the accumulated water.

[0085] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A drain valve, characterized in that: The drain valve comprises: Drain valve body; A first component is disposed inside the drain valve body, wherein a chamber is provided inside the first component; the drain valve body and the first component are interference-fitted; a second component, interference-fitted with the first component; a push rod, the push rod being in clearance fit with the first component and being capable of moving along the axis of the drain valve body within the cavity of the first component; a first return spring disposed in the cavity of the first component and between the second component and the push rod; The piston is arranged inside the drain valve body, the piston and the push rod are interference-fitted and sealed at the interference-fit position; the piston and the drain valve body are clearance-fitted, and a sealing member is provided between the piston and the drain valve body; A drain valve switch, engaged with the drain valve body through a connecting thread; The detection joint valve core is arranged inside the drain valve body, the detection joint valve core and the drain valve body are in clearance fit, and the detection joint valve core can move along the axis of the drain valve body; A second return spring is provided inside the drain valve body and is located between the piston and the detection joint valve core; The drain valve body is provided with a first hole and a second hole, and the first hole and the second hole are symmetrical about the axis of the drain valve body; The piston is provided with a vertical through hole, and the round rod passes through the second hole and is fixed with the upper portion of the vertical through hole of the piston by interference fit; The drain valve switch is rotated to move along the thread along the axis of the drain valve body, thereby driving the round rod to move along the axis of the drain valve body, and the round rod drives the piston and the push rod to move along the axis of the drain valve body; In the first state, the first return spring applies pressure to the push rod, forming a sealed fit between the push rod and the first component; the second return spring applies pressure to the end face of the detection joint valve core, and the end face of the detection joint valve core is sealed with the drain valve body via the sixth sealing ring; In the second state, the push rod applies pressure to the first return spring, the first return spring is compressed, and a gap is formed between the push rod and the first component; the second return spring applies pressure to the end face of the detection joint valve core, and the end face of the detection joint valve core is sealed with the drain valve body via the sixth sealing ring; In the third state, the first return spring applies pressure to the push rod, forming a sealed fit between the push rod and the first component; the end face of the detection joint valve core applies pressure to the second return spring, the second return spring is compressed, and a gap is formed between the end face of the detection joint valve core and the drain valve body.

2. The drain valve according to claim 1, characterized in that: Forming a sealed fit between the push rod and the first component, comprising: The second sealing ring is fixed to the push rod through the second groove; the push rod and the end surface of the first component are squeezed and sealed by the second sealing ring; The third sealing ring is fixed on the push rod through the third groove; the first gap between the push rod and the first component is sealed by the third sealing ring.

3. The drain valve according to claim 1, characterized in that: The sealing member includes a fourth sealing ring and a fifth sealing ring. The fourth sealing ring is fixed to one side of the piston relative to the through hole through a fourth groove. The fifth sealing ring is fixed to the other side of the piston relative to the vertical through hole through a fifth groove.

4. The drain valve according to claim 1, characterized in that: Also includes: a snap ring, fixed to the drain valve through a sixth groove; A retaining ring, one side of which is fixed by a retaining ring, and the other side is fixed in contact with the valve body of the drain valve; the piston is provided with a plurality of axial through holes.

5. The drain valve according to claim 1, characterized in that: Also includes: The detection connector cap is fixed to the seventh groove through a ring.

6. An air storage cylinder, characterized in that: The gas storage cylinder comprises: an air reservoir body having a bottom, a top, a first end, and a second end; The drain valve according to any one of claims 1 to 5, wherein the drain valve is disposed at the first end or the second end of the air storage cylinder, and further comprising: a first external thread, wherein the drain valve is connected to the air storage cylinder body via the first external thread; A first sealing ring is fixed to the first groove; the drain valve and the air storage cylinder body are sealed by the first sealing ring; A hose is fixed to the drain valve.

7. The gas cylinder according to claim 6, characterized in that The second component further includes a barbed tooth; the hose is connected to the second component via the barbed tooth.

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