Self-operated drain valve

Abstract

The present invention provides a self-operated material discharging valve, which relates to the field of pneumatic conveying technology, and includes a valve body, a valve cover, a first valve core assembly, a first regulating member, and a driving mechanism; the first valve core assembly includes a first valve seat, a first valve core and a first spring; the first valve core has a sealing portion, and the sealing portion can extend into the first valve seat; the first valve seat has a connecting portion matching the sealing portion; the driving mechanism includes a diaphragm and a diaphragm seat; the diaphragm is arranged in a receiving space formed by the valve body and the valve cover, and can separate the receiving space into a guide chamber and an air chamber that are independent of each other; the diaphragm seat is arranged in the guide chamber and can be pushed by the diaphragm; the diaphragm seat has an extension portion, which is plugged into the valve body and indirectly connected to the first valve core through a first regulating member; the length of the first regulating member is adjustable. When the conveying pipeline is blocked, compressed gas can enter the conveying pipeline to purge the solid powder in the conveying pipeline to achieve unblocking of the conveying pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic conveying of materials, in particular to a self-operated material discharge valve. Background Art

[0002] Pneumatic conveying is the transportation of granular materials through compressed gas and has been widely used in the ash handling systems of thermal power plants in my country.

[0003] Pneumatic conveying technology is also used in solid powder conveying systems. However, due to the characteristics of solid powder such as large particles and large friction between particles, the conveying of solid powder requires a large driving force, and it is very easy for solid powder to block the conveying pipeline. When the conveying pipeline is blocked, it will seriously affect the normal conveying of solid powder.

[0004] Therefore, in order to ensure the normal transportation of solid powder, a variety of related discharge valves have appeared in the prior art, but it is still necessary to design a discharge valve with other structures to clear the solid powder in the conveying pipeline when the conveying pipeline is blocked, so that the solid powder can flow normally with the airflow. Summary of the Invention

[0005] In view of the above situation, the present invention provides a self-operated material discharge valve, which aims to solve the technical problem that the existing conveying pipeline is easily blocked by solid powder, thereby affecting the normal conveying of solid powder.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a self-operated material discharge valve, which mainly includes:

[0008] A valve body, a valve cover, a first valve core assembly, a first regulating member, and a driving mechanism for driving the first valve core assembly;

[0009] The first valve core assembly includes a first valve seat, a first valve core, and a first spring; the first valve core has a tapered sealing portion, which can extend into the first valve seat; the first valve seat has a tapered connecting portion matching the sealing portion;

[0010] The driving mechanism includes: a diaphragm and a diaphragm seat;

[0011] The diaphragm is arranged in the accommodation space formed by the valve body and the valve cover, and can separate the accommodation space into a guide chamber and an air chamber that are independent of each other, wherein the air chamber can form a relatively closed space, and the guide chamber is connected to the outside atmosphere;

[0012] The diaphragm seat is arranged in the guide chamber and can be pushed by the diaphragm; the diaphragm seat has an extension portion, the extension portion is plugged into the hole in the valve body, and is indirectly connected to the first valve core through the first adjusting member;

[0013] The length of the first adjusting member is adjustable so that the distance between the diaphragm seat and the first valve core can be adjusted within a preset range.

[0014] In some embodiments of the present invention, a one-way valve is further included, and the one-way valve is installed as a whole in the air outlet of the valve body;

[0015] The one-way valve includes a second valve seat, a second valve core, an adjusting nut and a second spring;

[0016] The second valve seat is installed in the air outlet, and a vent hole is opened at one end of the second valve seat;

[0017] The second valve core is movably disposed in the second valve seat and is capable of blocking the vent hole;

[0018] The adjusting nut is threadedly connected in the second valve seat;

[0019] One end of the second spring is connected to the adjusting nut, and the other end is connected to the second valve core.

[0020] In some embodiments of the present invention, the second valve seat is plugged into the air outlet;

[0021] The air outlet is further connected with an outlet connector, one end of which abuts against the second valve seat, and the middle of the outlet connector has a convex portion, the outer diameter of the convex portion is larger than the inner diameter of the air outlet;

[0022] The convex part is connected with the air outlet of the valve body through bolts.

[0023] In some embodiments of the present invention, the valve body has an air inlet, an air distribution channel, and an air outlet that can be connected in sequence;

[0024] The first valve seat is arranged in the air distribution channel, and the first valve seat has a connecting groove, a first air channel and a second air channel that can be connected in sequence; the first valve core is movably arranged in the connecting groove, and an air guide gap is left between the side wall of the first valve core and the side wall of the connecting groove; the first spring is installed in the air distribution channel and one end of it abuts against the first valve core, so that the first valve core can block the air path between the air distribution channel and the first air channel under a preset pressure.

[0025] In some embodiments of the present invention, one end of the air distribution channel extends outside the valve body, a second adjusting member is threadedly connected to the air distribution channel, one end of the first spring is connected to the second adjusting member, and the other end is connected to the first valve core;

[0026] The second regulating member can block the air distribution channel, and the air inlet is located between the second regulating member and the first valve seat.

[0027] In some embodiments of the present invention, the driving mechanism further includes a diverter channel formed in the valve body;

[0028] One end of the diversion channel is communicated with the gas distribution channel, and the other end is communicated with the air chamber and the gas outlet.

[0029] In some embodiments of the present invention, the first valve seat further has a third air channel;

[0030] One end of the third air channel is communicated with the first air channel, and the other end is communicated with the middle portion of the diversion channel.

[0031] In some embodiments of the present invention, the diversion channel is connected to a regulating valve core and a pressure gauge.

[0032] In some embodiments of the present invention, the first adjusting member includes a lifting member, one end of the lifting member is threadedly connected to the extension portion, and the other end is movably abutted against the first valve core; or, one end of the lifting member is threadedly connected to the first valve core, and the other end is movably abutted against the extension portion.

[0033] In some embodiments of the present invention, the valve cover is provided with an air supply port.

[0034] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0035] 1. The air inlet can be connected to a high-pressure air source, and the air outlet can be connected to a conveying pipeline for conveying solid powder. When the conveying pipeline is blocked, the first valve core can be moved upward to open the first air channel to connect the connecting groove and the first air channel. In this way, a large amount of compressed gas from the high-pressure air source can pass through the path formed by the air inlet, the air distribution channel, the connecting groove, the first air channel, the second air channel and the air outlet, and finally enter the conveying pipeline to purge the solid powder in the conveying pipeline, thereby unblocking the conveying pipeline and ensuring the normal transportation of the solid powder.

[0036] 2. The present invention adopts a diaphragm and a diaphragm seat to replace the traditional piston. The sealing requirements between the diaphragm seat and the air chamber are relatively low, which effectively reduces the manufacturing and maintenance costs of the equipment.

[0037] 3. This invention provides an adjustable spacing between the first valve core and the extension of the drive mechanism, reducing the assembly precision requirements for the self-operated material drain valve. During assembly, the operator can adjust the spacing between the first valve core and the extension according to actual conditions. This ensures that when the first valve core contacts the top of the first adjustment member as it moves toward the first air passage, it securely engages the first air passage on the valve seat.

[0038] 4. During the process of the first valve core moving downward and resetting, the sealing portion of the first valve core and the connecting portion of the first valve seat cooperate with each other in a conical shape, which can automatically achieve the centering of the sealing portion of the first valve core.

[0039] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 It is a structural diagram of the self-operated material discharge valve;

[0042] Figure 2 for Figure 1 Structural diagram of the local enlarged view of position A in the middle.

[0043] icon:

[0044] 11-valve body, 111-air inlet, 112-air distribution channel, 113-air outlet, 114-second regulating member,

[0045] 121-first valve seat, 122-first valve core, 123-first spring, 124-connecting groove, 125-first air channel, 126-second air channel, 127-air guide gap, 128-third air channel, 129-sealing part, 131-connecting part, 132-limiting column,

[0046] 2-driving mechanism, 21-valve cover, 211-bayonet, 212-air supply port, 22-diaphragm, 23-diaphragm seat, 231-extension, 24-diversion channel, 25-guide chamber, 26-air chamber, 27-regulating valve core, 28-pressure gauge,

[0047] 3-first adjusting piece, 31-lifting piece, 32-limiting nut,

[0048] 4- one-way valve, 41- second valve seat, 411- vent hole, 42- second valve core, 43- adjusting nut, 44- second spring, 45- outlet connector, 451- convex portion. DETAILED DESCRIPTION

[0049] In the following, only certain exemplary embodiments are briefly described. As those skilled in the art would realize, the described embodiments may be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0050] In the description of the embodiments of the present invention, it should be understood that the terms "width", "up", "down", "left", "right", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of 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 cannot be understood as a limitation on the embodiments of the present invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0052] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0053] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example

[0054] Please refer to Figure 1-Figure 2 This embodiment provides a self-operated material discharge valve, which mainly includes a valve body 11, a first valve core assembly, a driving mechanism 2, a first adjusting member 3 and a one-way valve 4.

[0055] The valve body 11 has an air inlet 111 , an air distribution channel 112 and an air outlet 113 which can be communicated with each other in sequence.

[0056] The first valve core assembly primarily comprises a first valve seat 121, a first valve core 122, and a first spring 123. The first valve seat 121 is disposed within the air distribution channel 112 and has a connecting groove 124, a first air passage 125, and a second air passage 126 that can sequentially connect. The first valve core 122 is movably disposed within the connecting groove 124, with an air guide gap 127 provided between the sidewalls of the first valve core 122 and the sidewalls of the connecting groove 124 to facilitate communication between the air distribution channel 112, the connecting groove 124, and the first air passage 125. One end of the first spring 123 is mounted within the air distribution channel 112, and the other end is connected to the first valve core 122. The first spring 123 is configured to cause the first valve core 122 to block the first air passage 125 with a predetermined preload.

[0057] The driving mechanism 2 is used to enable the first valve core 122 to open the first air channel 125 so that the air distribution channel 112, the connecting groove 124, the first air channel 125, the second air channel 126 and the air outlet 113 are connected in sequence.

[0058] The first adjusting member 3 is used to connect the driving mechanism 2 and the first valve core 122 , and can adjust the distance between the driving mechanism 2 and the first valve core 122 .

[0059] The one-way valve 4 is integrally installed in the air outlet 113 .

[0060] The air inlet 111 can be connected to a high-pressure air source, and the air outlet 113 can be connected to a conveying pipe for conveying solid powder. When the conveying pipe is blocked, the first valve core 122 can be moved upward to open the first air channel 125 to connect the connecting groove 124 and the first air channel 125. In this way, a large amount of compressed gas from the high-pressure air source can enter the conveying pipe through the path formed by the air inlet 111, the air distribution channel 112, the connecting groove 124, the first air channel 125, the second air channel 126 and the air outlet 113, and finally enter the conveying pipe to purge the solid powder in the conveying pipe, thereby unblocking the conveying pipe and ensuring the normal conveying of the solid powder. When the conveying pipe for conveying solid powder is blocked, the pressure in the conveying pipe will gradually increase. By installing a one-way valve 4 in the air outlet 113, the solid powder in the conveying pipe can be prevented from flowing back from the air outlet 113 to the air distribution channel 112.

[0061] The above generally describes the main components and working principles of the self-operated material discharge valve. The following will explain the self-operated material discharge valve in more detail.

[0062] To facilitate upward movement of the first valve core 122, the drive mechanism 2 preferably uses a self-powered mechanism to drive the first valve core 122. Specifically, the drive mechanism 2 primarily comprises a valve cover 21, a diaphragm 22, a diaphragm seat 23, and a diverter channel 24. The valve cover 21 is connected to the valve body 11, forming a storage space between the valve cover 21 and the valve body 11. The diaphragm 22 is disposed within the storage space and is capable of dividing the storage space into a mutually independent guide chamber 25 and an air chamber 26. The air chamber 26 forms a sealed space, and the area below the diaphragm 22 is larger than the area above the first valve core 122. The diaphragm seat 23 is disposed within the guide chamber 25 and is capable of being pushed by the diaphragm 22. The diaphragm seat 23 has an extension 231 that engages with a hole in the valve body 11 and is indirectly connected to the first valve core 122 via the first adjusting member 3. One end of the diverter channel 24 communicates with the air distribution channel 112, and the other end communicates with the air chamber 26. After the compressed gas enters the air distribution channel 112 from the air inlet 111, it enters the air chamber 26 through the diversion channel 24. At this time, the contact area between the diaphragm 22 and the compressed gas is larger than the contact area between the first valve core 122 and the compressed gas, so that the diaphragm 22 drives the first valve core 122 to move away from the first air channel 125, thereby connecting the air inlet 111, the air distribution channel 112, the connecting groove 124, the first air channel 125, the second air channel 126 and the air outlet 113 in sequence.

[0063] When the conveying pipeline is blocked, the compressed gas from the high-pressure gas source can enter the gas distribution channel 112 through the air inlet 111, and then enter the air chamber 26 through the diversion channel 24. At this time, the contact area between the diaphragm 22 and the compressed gas is larger than the contact area between the first valve core 122 and the compressed gas, so that the diaphragm 22 drives the diaphragm seat 23 to move upward, and the diaphragm seat 23 can drive the first valve core 122 to move upward, so that the air inlet 111, the gas distribution channel 112, the connecting groove 124, the first air channel 125, the second air channel 126 and the air outlet 113 are connected in sequence. In this way, a large amount of compressed gas can enter the conveying pipeline to purge the solid powder in the conveying pipeline, realize the dredging of the conveying pipeline, and thus ensure the normal transportation of the solid powder.

[0064] The diverter channel 24 may be connected to a regulating valve core 27 and a pressure gauge 28 to adjust the flow rate in the diverter channel 24 and detect the pressure in the diverter channel 24 .

[0065] In order to enable the diaphragm 22 to drive the first valve core 122 to move upward, the diameter of the diaphragm 22 is larger than the diameter of the accommodating space ( Figure 1(See the left-right dimensions shown in the figure). The diaphragm 22 may also be elastic. Specifically, when the width of the diaphragm 22 is greater than the width of the accommodation space, the diaphragm 22 can push the first valve core 122 upward under the action of air pressure. When the diaphragm 22 is elastic, the diaphragm 22 can deform under the action of air pressure to push the first valve core 122 upward. The diaphragm 22 can also meet both of these conditions simultaneously. That is, the diaphragm 22 can be greater than the width of the accommodation space and also be elastic, which enables the diaphragm 22 to push the first valve core 122 upward under the action of air pressure.

[0066] In this embodiment, the diameter of the diaphragm 22 is preferably 3-4 times the diameter of the first valve core 122 to ensure that the diaphragm 22 can push the first valve core 122 upward. To facilitate the fixation of the diaphragm 22, the valve cover 21 is preferably provided with a bayonet 211, which cooperates with the valve body 11 to clamp and fix the edge of the diaphragm 22. The valve cover 21 and the valve body 11 are connected by bolts to facilitate the removal and installation of the valve cover 21.

[0067] A breathing hole (not shown in the figure) can also be opened on the side wall of the guide chamber 25. The breathing hole is used to connect the external environment with the guide chamber 25. In this way, even when the size of the diaphragm seat 23 is basically the same as the size of the guide chamber 25, the diaphragm seat 23 will encounter less resistance when moving up and down in the guide chamber 25, thereby facilitating the opening and closing of the first valve core assembly, that is, facilitating the up and down movement of the first valve core 122.

[0068] An air supply port 212 may be further provided on the lower side of the valve cover 21 . The air supply port 212 may be connected to other air sources. The compressed gas entering the air chamber 26 through the air supply port 212 may also cause the diaphragm seat 23 to move upward.

[0069] The first valve seat 121 may also have a third air channel 128, one end of which is connected to the first air channel 125 and the other end is connected to the middle of the diverter channel 24. When the solid powder in the delivery pipeline connected to the gas outlet 113 is small, the compressed gas in the gas distribution channel 112 can directly enter the delivery pipeline through the path formed by the diverter channel 24, the third air channel 128, the first air channel 125, the second air channel 126 and the gas outlet 113, so as to provide a small amount of air to the delivery pipeline, thereby saving gas source; when the delivery pipeline is blocked due to a large amount of solid powder, the pressure in the delivery pipeline gradually increases, so that the pressure in the air inlet 111 also increases, and the pressure in the diverter channel 24 is reduced. The compressed gas enters the air chamber 26 and pushes the diaphragm seat 23 and the first valve core 122 upward through the diaphragm 22 to connect the connecting groove 124 and the first air channel 125. At this time, a large amount of compressed gas located in the gas distribution channel 112 can enter the conveying pipeline through the path formed by the gas distribution channel 112, the connecting groove 124, the first air channel 125, the second air channel 126 and the air outlet 113 to replenish a large amount of compressed gas into the conveying pipeline, thereby purging the solid powder in the conveying pipeline and achieving unblocking of the conveying pipeline.

[0070] It should be noted that the driving mechanism 2 can drive the first valve core 122 actively, for example, it can be driven by a power source such as a cylinder, or it can be passive, or self-powered. When the driving mechanism 2 drives the first valve core 122 in the self-powered form as described above, it is beneficial to reduce energy consumption and reduce costs.

[0071] One end of the air distribution channel 112 extends outside the valve body 11. A second adjusting member 114 is internally threadedly connected to the air distribution channel 112. One end of the first spring 123 is connected to the second adjusting member 114, and the other end is connected to the first valve core 122. The second adjusting member 114 can block the air distribution channel 112. The air inlet 111 is located between the second adjusting member 114 and the first valve seat 121. By rotating the second adjusting member 114, the preset force of the first spring 123 on the first valve core 122 can be adjusted.

[0072] The first adjusting member 3 mainly includes a lifting member 31, one end of the lifting member 31 is installed on the driving mechanism 2, and the other end is in contact with the first valve core 122. When the driving mechanism 2 moves upward, the lifting member 31 can push the first valve core 122 upward. When the driving mechanism 2 moves downward, the first valve core 122 can move downward and reset under the action of the first spring 123 to re-block the first air channel 125. Specifically, the lifting member 31 is threadedly connected to the driving mechanism 2. In this embodiment, the lower end of the lifting member 31 is threadedly connected to the upper end of the extension 231. A limiting nut 32 is threadedly connected to the lifting member 31. More specifically, the lifting member 31 is a bolt. The setting of the limiting nut 32 makes it easy to adjust the distance between the lifting member 31 and the driving mechanism 2. By setting the distance between the lifting member 31 and the driving mechanism 2 to be adjustable, the requirements for assembly accuracy of the self-operated material discharge valve can be reduced. During the assembly of the self-operated material discharge valve, the operator can adjust the distance between the sealing portion 129 of the first valve core 122 and the extension portion 231 of the driving mechanism 2 according to actual conditions, so that when the first valve core 122 moves toward the first air channel 125, when the top of the lifting member 31 contacts the sealing portion 129 of the first valve core 122, the sealing portion 129 of the first valve core 122 can also fit tightly with the first air channel 125 on the valve seat 121.

[0073] The function of the first adjusting member 3 is, on the one hand, to enable the driving mechanism 2 to drive the first valve core 122 to move upward, and on the other hand, the length of the first adjusting member 3 is adjustable so that the distance between the extension portion 231 and the first valve core 122 can be adjusted within a preset range; the above-mentioned first adjusting member 3 is only a preferred specific implementation method, and the first adjusting member 3 can also adopt other structures, as long as it can achieve the above-mentioned purpose, and this embodiment will no longer list them one by one.

[0074] The first valve core 122 can be moved downward and reset under the action of the first spring 123 to re-block the first air channel 125. The first valve core 122 has a truncated cone or conical sealing portion 129, which can extend into the first air channel 125 to block the first air channel 125. The first air channel 125 has a connecting portion 131 that matches the sealing portion 129, and the connecting portion 131 is tapered. Figure 1 and Figure 2As described above, the diameter of the sealing portion 129 gradually decreases from top to bottom, and the diameter of the connecting portion 131 also gradually decreases from top to bottom. During the downward movement and reset of the first valve core 122, the sealing portion 129 can extend into the first air channel 125 and automatically achieve centering of the sealing portion 129. In this way, even if there is a slight misalignment between the sealing portion 129 and the first air channel 125 after the first valve core 122 is moved upward, as the first valve core 122 is moved downward and reset, the sealing portion 129 can eventually fit tightly with the first air channel 125 to block the first air channel 125. In addition, a large contact area can be provided between the connecting portion 131 and the sealing portion 129, which helps to ensure a tight fit between the sealing portion 129 and the first air channel 125.

[0075] A limiting post 132 is provided on the top of the first valve core 122 , and the lower end of the first spring 123 is sleeved on the limiting post 132 to prevent the first valve core 122 from shaking excessively during the up and down movement.

[0076] In this embodiment, the one-way valve 4 preferably comprises a second valve seat 41, a second valve core 42, an adjusting nut 43, and a second spring 44. The second valve seat 41 is mounted within the air outlet 113. A vent 411 is defined at the right end of the second valve seat 41. The second valve core 42 is movably disposed within the second valve seat 41 and is capable of blocking the vent 411. The adjusting nut 43 is threadedly connected within the second valve seat 41. One end of the second spring 44 is connected to the adjusting nut 43, and the other end is connected to the second valve core 42. By turning the adjusting nut 43, the force between the second valve core 42 and the vent 411 can be adjusted.

[0077] In this embodiment, the one-way valve 4 is installed within the air outlet 113 in the following manner: the second valve seat 41 is plugged into the air outlet 113, and the air outlet 113 is also plugged into an outlet connector 45. The right end of the outlet connector 45 abuts the left end of the second valve seat 41. The middle portion of the outlet connector 45 has a protrusion 451. The outer diameter of the protrusion 451 is larger than the inner diameter of the air outlet 113, and the protrusion 451 is connected to the end of the air outlet 113 via a bolt. The provision of the outlet connector 45 restricts the movement of the one-way valve 4 within the air outlet 113. After removing the outlet connector 45, the one-way valve 4 can be replaced as a whole.

[0078] It should be noted that the above-mentioned installation method of the one-way valve 4 is only a preferred specific implementation method. In other implementation scenarios, other methods can also be used to install the one-way valve 4 in the air outlet 113.

[0079] As can be seen from the disclosed embodiments, this self-operated material discharge valve requires no external sensors or other control components. When a pipe blockage occurs, the local pressure in the discharge pipe increases. When the pressure reaches a set value, the valve automatically opens the main valve core (first valve core) to purge the pipe. When the pressure drops below the set value, the valve automatically closes, effectively conserving compressed air. This means that the valve only clears and blows air when a pipe blockage occurs, effectively reducing energy consumption.

[0080] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. The embodiments and features of the embodiments of this application may be combined arbitrarily without conflict. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A self-operated material discharge valve, characterized in that: include: A valve body, a valve cover, a first valve core assembly, a first adjusting member, and a driving mechanism for driving the first valve core assembly to move; The first valve core assembly includes a first valve seat, a first valve core and a first spring; the first valve core has a conical sealing portion, and the sealing portion can extend into the first valve seat; the first valve seat has a tapered connecting portion matching the sealing portion; The driving mechanism comprises: a diaphragm and a diaphragm seat; The diaphragm is arranged in the accommodation space formed by the valve body and the valve cover, and can separate the accommodation space into a guide chamber and an air chamber which are independent of each other, wherein the air chamber can form a relatively closed space, and the guide chamber is communicated with the outside atmosphere; The diaphragm seat is arranged in the guide chamber and can be pushed by the diaphragm; the diaphragm seat has an extension portion, the extension portion is plugged into the hole in the valve body, and is indirectly connected to the first valve core through the first regulating member; The length of the first adjusting member is adjustable so that the distance between the diaphragm seat and the first valve core is adjustable within a preset range.

2. The self-operated material drain valve according to claim 1, characterized in that: Also included is a one-way valve, which is installed as a whole in the air outlet of the valve body; The one-way valve comprises a second valve seat, a second valve core, an adjusting nut and a second spring; The second valve seat is installed in the air outlet, and a vent hole is opened at one end of the second valve seat; The second valve core is movably disposed in the second valve seat and is capable of blocking the vent hole; The adjusting nut is threadedly connected in the second valve seat; One end of the second spring is connected to the adjusting nut, and the other end of the second spring is connected to the second valve core.

3. The self-operated material drain valve according to claim 2, characterized in that: The second valve seat is plugged into the air outlet; An outlet connector is also inserted at the air outlet, one end of the outlet connector is in contact with the second valve seat, a convex portion is provided in the middle of the outlet connector, and an outer diameter of the convex portion is greater than an inner diameter of the air outlet; The convex portion is connected to the air outlet of the valve body through bolts.

4. The self-operated material drain valve according to claim 1 is characterized in that: The valve body has an air inlet, an air distribution channel and an air outlet which can be connected in sequence; The first valve seat is arranged in the gas distribution channel, and the first valve seat has a connecting groove, a first air channel and a second air channel that can be connected in sequence; the first valve core is movably arranged in the connecting groove, and an air guide gap is left between the side wall of the first valve core and the side wall of the connecting groove; the first spring is installed in the gas distribution channel and one end of which abuts against the first valve core, so that the first valve core can block the air path between the gas distribution channel and the first air channel under a preset pressure.

5. The self-operated material drain valve according to claim 4, characterized in that: One end of the air distribution channel extends outside the valve body, a second adjusting member is threadedly connected to the air distribution channel, one end of the first spring is connected to the second adjusting member, and the other end is connected to the first valve core; The second adjusting member can block the gas distribution channel, and the air inlet is located between the second adjusting member and the first valve seat.

6. The self-operated material drain valve according to claim 4 is characterized in that: The driving mechanism further includes a flow diversion channel formed in the valve body; One end of the flow distribution channel is communicated with the gas distribution channel, and the other end is communicated with the air chamber and the gas outlet.

7. The self-operated material drain valve according to claim 6, characterized in that: The first valve seat also has a third air channel; One end of the third air channel is communicated with the first air channel, and the other end is communicated with the middle part of the diversion channel.

8. The self-operated material drain valve according to claim 6, characterized in that: The diversion channel is connected with a regulating valve core and a pressure gauge.

9. The self-operated material drain valve according to any one of claims 1 to 8, characterized in that: The first adjusting member includes a lifting member, one end of which is threadedly connected to the extension portion, and the other end is movably abutted against the first valve core; or one end of the lifting member is threadedly connected to the first valve core, and the other end is movably abutted against the extension portion.

10. The self-operated material drain valve according to any one of claims 1 to 8, characterized in that: The valve cover is provided with a gas supply port.

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