Exhaust valve suitable for impurity working condition

Abstract

The utility model discloses an exhaust valve suitable for impurity working conditions, and relates to the technical field of exhaust valves. The exhaust channel is used for exhausting gas in the valve cylinder; the conical sealing plug can move towards the exhaust channel and can move to the sealing surface to be attached to the inner circumferential side face of the exhaust channel so as to block the exhaust channel. The elastic sealing ring is used for scraping and sweeping the sealing surface of the conical sealing plug in the process that the conical sealing plug moves towards the exhaust channel. According to the exhaust valve suitable for the impurity working condition, the technical problems that after an existing exhaust valve is repeatedly opened and closed, impurities can be brought into the sealed key sealing end face, the exhaust valve is poor in sealing, and a closed system loses pressure are solved, residual impurities on the sealing surface are scraped off through the elastic sealing ring, and the sealing effect is good. Residual impurities on the sealing surface are prevented from being brought into the key sealing end face, the conical sealing plug is made to make close contact with the exhaust channel, and the exhaust valve can still reliably operate under the working condition that the impurity content is large.

Description

TECHNICAL FIELD

[0001] The utility model relates to exhaust valve technical field, especially a kind of exhaust valve suitable for impurity working condition. BACKGROUND

[0002] Exhaust valve is important auxiliary element in pipeline system, is widely used in boiler, petroleum and natural gas, water supply and drainage pipeline.Exhaust valve is generally installed at high point or elbow etc., its function is to remove the excess gas in pipeline, to improve the efficiency of pipeline and reduce energy consumption.Heating system and air conditioning system in operation process, water releases gas when heating, such as hydrogen, oxygen etc., these gases cannot be removed in time will produce a lot of adverse consequences, such as corrosion caused by oxidation, the formation of air pocket in radiator, due to hot water circulation not smooth not balanced and lead to some radiator local not hot, noise when pipeline gas operation, vortex empty phenomenon of circulating pump etc.

[0003] The existing closed system is generally installed with float ball lever type exhaust valve, when exhaust valve is in exhaust state, float ball will pull one end of lever downward due to gravity, at this time, lever is in inclined state, gap appears in the contact part of lever and exhaust hole, air is discharged from exhaust hole through the gap, with the discharge of air, water level rises, float ball floats upward under the action of water buoyancy, sealing end surface on lever gradually presses exhaust hole, until the whole exhaust hole is completely blocked, exhaust valve is completely in closed state at this time.

[0004] In the process of realizing the present application, the inventor found that the prior art at least has the following problems: in the use process of exhaust valve, due to the water quality of application working condition cannot guarantee its cleanliness, impurities will be brought into the key sealing end surface of sealing after repeated opening and closing, leading to poor sealing of exhaust valve, thereby causing liquid leakage of exhaust valve, resulting in pressure loss of closed system. Therefore, an exhaust valve suitable for impurity working condition for solving the above problems is proposed. CONTENT OF UTILITY MODEL

[0005] The utility model aims at providing an exhaust valve suitable for impurity working condition, solves the technical problem that the existing exhaust valve will bring impurities into the key sealing end surface of sealing after repeated opening and closing, leading to poor sealing of exhaust valve, causing pressure loss of closed system.

[0006] To achieve the above object, the utility model provides an exhaust valve suitable for impurity working condition, comprising:

[0007] Valve barrel;

[0008] Exhaust passage, be equipped with in the upper end part of valve barrel, exhaust passage is used for discharging gas inside valve barrel;

[0009] A conical sealing plug is capable of moving to the exhaust passage and moving to a sealing surface of the conical sealing plug abutting an inner circumferential side of the exhaust passage to block the exhaust passage;

[0010] A resilient sealing ring is arranged at a lower end of the exhaust passage to be capable of scraping the sealing surface of the conical sealing plug during the movement of the conical sealing plug to the exhaust passage.

[0011] An inner side of the valve cylinder is provided with a floating ball, an upper end of the floating ball is connected to the conical sealing plug, and the floating ball is used to push the conical sealing plug to move to the exhaust passage when floating.

[0012] Preferably, an inner side wall of the valve cylinder is rotatably connected to a main guide rod, a bottom surface of the conical sealing plug is provided with a support rod, a middle part of the main guide rod is rotatably connected to a lower end of the support rod, and the other end of the main guide rod is rotatably connected to an upper end of the floating ball.

[0013] Preferably, a bottom surface of the conical sealing plug is provided with a support rod, and a lower end of the support rod is connected to an upper end of the floating ball.

[0014] Preferably, an inner side of the exhaust passage is provided with a gas permeable plate, and a surface of the gas permeable plate is arrayed with a plurality of gas permeable holes.

[0015] Preferably, an upper end of the conical sealing plug is provided with a blocking block, a top surface of the blocking block is provided with a sealing gasket, and the sealing gasket is used to block the gas permeable holes.

[0016] Preferably, the resilient sealing ring comprises a sealing part and a cleaning part, an inner side of a lower end of the sealing part is provided with a sealing surface, and the sealing surface is used to abut the sealing surface of the conical sealing plug when the conical sealing plug abuts the sealing part.

[0017] Preferably, an inner side of a lower end of the cleaning part is provided with a first taper surface, the first taper surface is used to abut the sealing surface of the conical sealing plug when the conical sealing plug abuts the sealing part, an inner side of an upper end of the cleaning part is provided with a second taper surface, and the second taper surface is used to abut the sealing surface of the conical sealing plug when the conical sealing plug abuts the cleaning part.

[0018] Preferably, an upper end of the valve cylinder is provided with a fitting hole, an upper end of the fitting hole is provided with a stepped groove, an outer side wall of the exhaust passage is provided with an annular protrusion, and the annular protrusion is connected to the stepped groove through clamping.

[0019] Preferably, a bottom surface of the stepped groove is provided with an O-shaped sealing ring, the O-shaped sealing ring is sleeved on the outer side wall of the exhaust passage, and a top surface of the O-shaped sealing ring abuts a bottom surface of the annular protrusion.

[0020] With respect to the above background art, the exhaust valve suitable for the impurity working condition provided by the utility model has the following beneficial effects: in the process that the conical sealing plug gradually enters the exhaust passage, the elastic sealing ring moves downward relative to the conical sealing plug, scrapes off the impurities remaining on the sealing surface of the conical sealing plug, prevents the remaining impurities on the sealing surface of the conical sealing plug from being brought into the position where the inner peripheral side surface of the exhaust passage is fitted, so that the sealing surface of the conical sealing plug is in close contact with the inner peripheral side surface of the exhaust passage, effectively avoids the liquid leakage of the exhaust valve, and ensures that the exhaust valve can still reliably operate under the working condition with high impurity content. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only the embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to the provided drawings without creative labor.

[0022] Figure 1 The cross-sectional schematic view of the exhaust valve provided by the embodiment of the utility model in the exhaust state is shown in the drawing;

[0023] Figure 2 The cross-sectional schematic view of the exhaust valve provided by the embodiment of the utility model in the closed state is shown in the drawing;

[0024] Figure 3 The cross-sectional schematic view of the exhaust valve provided by another embodiment of the utility model in the exhaust state is shown in the drawing;

[0025] Figure 4 The cross-sectional schematic view of the exhaust valve provided by another embodiment of the utility model in the closed state is shown in the drawing;

[0026] Figure 5 The cross-sectional schematic view of the exhaust passage in the process that the conical sealing plug moves upward is shown in the drawing; Figure 1 The enlarged schematic view of A in the drawing;

[0027] Figure 6 The cross-sectional schematic view of the exhaust passage in the process that the conical sealing plug moves upward is shown in the drawing;

[0028] Figure 7 The cross-sectional schematic view of the exhaust passage in the process that the conical sealing plug moves upward is shown in the drawing.

[0029] Specifically, 1-valve cylinder; 101-stair groove; 2-float ball; 3-main guide rod; 4-exhaust passage; 401-annular protrusion; 5-conical sealing plug; 6-elastic sealing ring; 601-sealing part; 602-cleaning part; 603-sealing mouth surface; 604-first taper surface; 605-second taper surface; 7-plugging block; 8-air permeable plate; 9-O-shaped sealing ring; 10-sealing gasket. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0032] As shown in Figure 1 , Figure 2 and Figure 5 , in order to achieve the above-mentioned purpose, the present application provides an exhaust valve suitable for impurity working conditions, comprising: a valve cylinder 1 and an exhaust passage 4 arranged on the valve cylinder 1, wherein the valve cylinder 1 is connected at the highest point or elbow in the pipeline, which can protect the pipeline from the impact of gas resistance or water flow, and the exhaust passage 4 is arranged at the upper end of the valve cylinder 1, and when the gas in the valve cylinder 1 reaches a certain amount, the gas in the valve cylinder 1 is discharged through the exhaust passage 4.

[0033] Specifically, the lower end of the exhaust passage 4 is provided with an elastic sealing ring 6, the inner side of the elastic sealing ring 6 is provided with a conical sealing plug 5, the conical sealing plug 5 can move towards the exhaust passage 4 and can move to the sealing surface of the conical sealing plug 5 abutting the inner peripheral side surface of the exhaust passage 4 to block the exhaust passage 4. Preferably, the elastic sealing ring 6 is made of rubber material, which has good elastic deformation capacity and corrosion resistance, and has long service life and good sealing performance.

[0034] During the process of gradually entering the exhaust passage 4, the elastic sealing ring 6 scrapes off the impurities remaining on the sealing surface of the conical sealing plug 5, so that the sealing surface of the conical sealing plug 5 is in close contact with the inner peripheral side surface of the exhaust passage 4, effectively avoiding the leakage of the exhaust valve.

[0035] When the tapered sealing plug 5 moves to and gradually enters the exhaust passage 4, the elastic sealing ring 6 is lowered relative to the tapered sealing plug 5, the elastic sealing ring 6 scrapes off the impurities remaining on the sealing surface of the tapered sealing plug 5, prevents the impurities remaining on the sealing surface of the tapered sealing plug 5 from being brought into the position where the sealing surface and the inner circumferential surface of the exhaust passage 4 are attached to each other, and makes the sealing surface of the tapered sealing plug 5 tightly contact with the inner circumferential surface of the exhaust passage 4, thereby effectively avoiding the exhaust valve from leaking, preventing the closed system from generating negative pressure, and ensuring the stable operation of the closed system.

[0036] The valve cylinder 1 is provided with the floating ball 2, and the upper end of the floating ball 2 is connected to the tapered sealing plug 5. When the gas in the valve cylinder 1 increases, the liquid level in the valve cylinder 1 decreases, the floating ball 2 is lowered under the action of gravity and synchronously with the liquid level in the valve cylinder 1, the floating ball 2 pulls down the tapered sealing plug 5, and the contact part of the tapered sealing plug 5 and the elastic sealing ring 6 has a gap. At this time, the exhaust valve is in an exhaust state. When the gas in the valve cylinder 1 is exhausted, the liquid level in the valve cylinder 1 gradually rises, the floating ball 2 is floated upward under the action of liquid buoyancy, the floating ball 2 drives the tapered sealing plug 5 to rise until the sealing surface of the tapered sealing plug 5 is tightly contacted, and at this time, the exhaust valve is completely in a closed state.

[0037] It should be noted that the impurity cleaning process is repeated once in each exhaust process of the exhaust valve. The higher the exhaust frequency is, the faster the cleaning rhythm is, and thus the exhaust valve can still reliably operate under the working condition with a large amount of impurities.

[0038] As shown in FIGS. Figure 1 and Figure 2 In an embodiment of the utility model, the inner side wall of the valve cylinder 1 is rotatably connected to the main guide rod 3. The left end of the main guide rod 3 is hingedly connected to the inner side wall of the valve cylinder 1, a support rod is arranged on the bottom surface of the tapered sealing plug, the middle part of the main guide rod 3 is hingedly connected to the lower end of the support rod, and the right end of the main guide rod 3 is hingedly connected to the upper end of the floating ball 2. When the gas in the valve cylinder 1 increases, the liquid level in the valve cylinder 1 decreases, the floating ball 2 is lowered, the floating ball 2 drives the right end of the main guide rod 3 to be lowered by a certain height, the main guide rod 3 pulls down the tapered sealing plug 5 through the support rod to make the tapered sealing plug 5 be lowered. When the gas in the valve cylinder 1 is exhausted, the liquid level in the valve cylinder 1 gradually rises, the floating ball 2 is floated upward under the action of liquid buoyancy, the floating ball 2 drives the right end of the main guide rod 3 to be raised by a certain height, and the main guide rod 3 drives the tapered sealing plug 5 to be raised through the support rod.

[0039] Preferably, the distance from the connection point of the support rod and the main guide rod 3 to the left end surface of the support rod is less than the distance from the connection point of the support rod and the main guide rod 3 to the right end surface of the support rod, so as to ensure that the liquid surface can push the conical sealing plug 5 upward under the condition of providing a small enough buoyancy force, and it is necessary to note that this embodiment can be applied to the case that the exhaust passage 4 is not directly above the float ball 2.

[0040] It is further necessary to note that in this embodiment, since the position of the connection point of the support rod and the main guide rod 3 is unchanged, the conical sealing plug 5 will be inclined at a certain angle relative to the exhaust passage 4 during the upward and downward movement of the conical sealing plug 5 driven by the main guide rod 3, and since the reciprocating distance of the conical sealing plug 5 is small, the deflection of the conical sealing plug 5 causes the elastic sealing ring 6 to be extruded to a degree of deformation that is less than the elastic deformation capacity of the elastic sealing ring 6, so as to ensure that the conical sealing plug 5 and the elastic sealing ring 6 can always stably contact.

[0041] As shown in FIGS. Figure 3 and Figure 4 In another embodiment of the utility model, the bottom surface of the conical sealing plug is provided with a support rod, and the lower end of the support rod is directly connected to the upper end of the float ball 2, when the gas in the valve cylinder 1 increases, the liquid level in the valve cylinder 1 drops, the float ball 2 drops, and the float ball 2 directly pulls down the conical sealing plug 5 through the support rod to make it move downward. During the exhaust process of the gas in the valve cylinder 1, the liquid level in the valve cylinder 1 gradually rises, and the float ball 2 is floated upward under the action of the liquid buoyancy, and the float ball 2 directly pushes the conical sealing plug 5 through the support rod to make it move upward, and it is necessary to note that in this embodiment, the conical sealing plug 5 is always coaxial with the exhaust passage 4 during the upward and downward movement of the conical sealing plug 5, and the problem of deflection of the conical sealing plug 5 does not need to be considered, and at the same time, this embodiment can be applied to the case that the exhaust passage 4 is directly above the float ball 2.

[0042] In an embodiment of the utility model, the inner side of the exhaust passage 4 is provided with a gas permeable plate 8, and a plurality of gas permeable holes are arranged on the surface of the gas permeable plate 8, and the gas in the valve cylinder 1 is discharged from the valve cylinder 1 through the gas permeable holes, and correspondingly, a blocking block 7 is arranged at the upper end of the conical sealing plug 5, the blocking block 7 is integrally arranged with the conical sealing plug 5, and a sealing gasket 10 is arranged on the top surface of the blocking block 7, when the sealing surface of the conical sealing plug 5 is attached to the inner circumferential surface of the exhaust passage 4, the top surface of the sealing gasket 10 is tightly attached to the gas permeable plate 8, the gas permeable holes are blocked by the sealing gasket 10, and the function of secondary sealing is achieved, which further avoids the leakage of the exhaust valve, and makes the liquid stopping function of the exhaust valve more reliable.

[0043] In addition, the outer side wall of the blocking block 7 and the outer side wall of the sealing gasket 10 can be attached to the inner side wall of the elastic sealing ring 6, and the outer side wall of the blocking block 7 and the outer side wall of the sealing gasket 10 can exert a certain holding force on the inner side wall of the elastic sealing ring 6. During the rising process of the conical sealing plug 5, the blocking block 7 and the sealing gasket 10 can carry away the residual impurities on the inner side wall of the elastic sealing ring 6, prevent the impurities from solidifying on the inner side wall of the elastic sealing ring 6 to affect the subsequent sealing condition, and improve the reliability of the exhaust valve.

[0044] As shown in Figure 5 , Figure 6 and Figure 7 , the elastic sealing ring 6 comprises a sealing part 601 and a cleaning part 602. Specifically, the sealing part 601 is used to contact the sealing surface of the conical sealing plug 5, and the inner side of the lower end of the sealing part 601 is provided with a sealing lip surface 603. The sealing lip surface 603 is a conical surface, which is attached to the sealing surface of the conical sealing plug 5 when the conical sealing plug 5 abuts against the sealing part 601. The provision of the sealing lip surface 603 can increase the contact area between the sealing part 601 and the conical sealing plug 5, avoid the phenomenon of local leakage of the contact surface between the sealing part 601 and the conical sealing plug 5, and enhance the sealing effect between the conical sealing plug 5 and the elastic sealing ring 6.

[0045] During the process of passing through the elastic sealing ring 6 and gradually contacting the sealing lip surface 603 of the exhaust passage 4, the conical sealing plug 5 scrapes off the residual impurities on the sealing surface of the conical sealing plug 5 through the cleaning part 602, so that the sealing surface of the conical sealing plug 5 is in close contact with the sealing lip surface 603. It should be noted that the cleaning part 602 is designed as an incomplete sealing structure to ensure that the cleaning part 602 can be opened and attached to the sealing surface of the conical sealing plug 5 under the holding action of the conical sealing plug 5, so that the residual impurities on the sealing surface of the conical sealing plug 5 can be completely scraped off.

[0046] Preferably, a first conical surface 604 is arranged on the inner side of the lower end of the cleaning part 602. During the upward movement of the conical sealing plug 5, when the conical sealing plug 5 abuts against the sealing part 601, the first conical surface 604 is attached to the sealing surface of the conical sealing plug 5. The first conical surface 604 can increase the contact area between the cleaning part 602 and the conical sealing plug 5, thereby enhancing the cleaning effect of the cleaning part 602 on the residual impurities on the sealing surface of the conical sealing plug 5, and enhancing the sealing effect between the conical sealing plug 5 and the elastic sealing ring 6.

[0047] Further, the inner side of the upper end of the cleaning part 602 is provided with a second taper surface 605, when the tapered sealing plug 5 abuts against the cleaning part 602, the second taper surface 605 is attached to the sealing surface of the tapered sealing plug 5, that is, when the first taper surface 604 is attached to the sealing surface of the tapered sealing plug 5, the second taper surface 605 is also attached to the sealing surface of the tapered sealing plug 5, the second taper surface 605 assists in increasing the contact area between the whole elastic sealing ring 6 and the tapered sealing plug 5, and further enhances the sealing effect between the tapered sealing plug 5 and the elastic sealing ring 6.

[0048] In one embodiment of the utility model, the upper end of the valve cylinder 1 is provided with an assembly hole, specifically, the inner side wall of the assembly hole is provided with a thread line, and the outer side wall of the exhaust passage 4 is also provided with a thread line, and the exhaust passage 4 is connected to the assembly hole in a threaded connection mode. Preferably, a stepped groove 101 is arranged at the upper end of the assembly hole, and the outer side wall of the exhaust passage 4 is provided with an annular protrusion 401, when the exhaust passage 4 enters the assembly hole to a certain depth, the bottom surface of the annular protrusion 401 abuts against the bottom surface of the stepped groove 101, thereby sealing the gap between the exhaust passage 4 and the assembly hole, and effectively preventing liquid from leaking from the connection position between the exhaust passage 4 and the assembly hole.

[0049] In addition, the bottom surface of the stepped groove 101 is provided with an O-shaped sealing ring 9, the O-shaped sealing ring 9 is sleeved on the outer side wall of the exhaust passage 4, when the bottom surface of the annular protrusion 401 abuts against the bottom surface of the stepped groove 101, the top surface of the O-shaped sealing ring 9 is attached to the bottom surface of the annular protrusion 401, and the bottom surface of the O-shaped sealing ring 9 is attached to the bottom surface of the stepped groove 101, thereby further enhancing the sealing effect between the exhaust passage 4 and the assembly hole.

[0050] When the utility model is used, when the gas in the valve cylinder 1 increases, the liquid level in the valve cylinder 1 decreases, the float ball 2 synchronously decreases under the action of gravity along with the liquid level in the valve cylinder 1, the right end of the main guide rod 3 is driven to decrease by the float ball 2, the main guide rod 3 drives the tapered sealing plug 5 to move downward through the supporting rod, when the contact part of the tapered sealing plug 5 and the elastic sealing ring 6 appears a gap, the exhaust valve starts to exhaust, during the gas exhaust process of the valve cylinder 1, the liquid level in the valve cylinder 1 gradually increases, the float ball 2 is floated upward under the action of liquid buoyancy, the right end of the main guide rod 3 is driven to rise to a certain height by the float ball 2, the main guide rod 3 drives the tapered sealing plug 5 to move upward through the supporting rod, in the process that the tapered sealing plug 5 gradually enters the exhaust passage 4, the cleaning part 602 moves downward relative to the tapered sealing plug 5, and the impurities remaining on the sealing surface of the tapered sealing plug 5 are scraped off, the float ball 2 drives the tapered sealing plug 5 to continuously rise until the sealing surface of the tapered sealing plug 5 is in close contact with the sealing surface 603 and the first taper surface 604, and the sealing gasket 10 is tightly attached to the bottom surface of the gas permeable plate 8, at this time, the exhaust valve is completely in a closed state.

[0051] In summary, during the moving of the conical sealing plug 5, the residual impurities on the sealing surface of the conical sealing plug 5 are scraped off by the cleaning part 602, the residual impurities on the sealing surface of the conical sealing plug 5 are prevented from being brought into the position abutting against the sealing surface 603, the sealing surface of the conical sealing plug 5 is tightly contacted with the sealing surface 603, the reliable operation of the exhaust valve under the working condition with high impurity content is ensured, and the liquid leakage of the exhaust valve is effectively avoided. Meanwhile, the sealing gasket 10 is tightly abutted against the air permeable plate 8, the air permeable hole is blocked, the exhaust passage 4 is secondarily sealed, the liquid leakage of the exhaust valve is further avoided, and the stable working of the closed system is ensured.

[0052] It should be noted that the relational terms herein such as first and second, and the like, are used solely to distinguish one entity from another entity, and do not necessarily require or imply any actual relationship or order between or among the entities.

[0053] The principle and implementation mode of the present application are described by using specific examples herein, and the above example is only used to help understand the method and core idea of the present application. It should be pointed out that, for those skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. An exhaust valve suitable for impurity conditions, characterized in that, include: Valve cylinder (1); An exhaust passage (4) is provided at the upper end of the valve cylinder (1), and the exhaust passage (4) is used to discharge the gas inside the valve cylinder (1); The conical sealing plug (5) is movable toward the exhaust channel (4) and can be moved to the inner circumferential side of the exhaust channel (4) with the sealing surface of the conical sealing plug (5) to block the exhaust channel (4). An elastic sealing ring (6) is provided at the lower end of the exhaust channel (4) so ​​as to scrape the sealing surface of the conical sealing plug (5) as the conical sealing plug (5) moves toward the exhaust channel (4).

2. The exhaust valve suitable for impurity conditions according to claim 1, characterized in that, The valve cylinder (1) is equipped with a float (2), the upper end of which is connected to the conical sealing plug (5). The float (2) is used to push the conical sealing plug (5) towards the exhaust channel (4) when it floats.

3. The exhaust valve suitable for impurity conditions according to claim 2, characterized in that, The inner wall of the valve cylinder (1) is rotatably connected to the main guide rod (3), the bottom surface of the conical sealing plug (5) is provided with a support rod, the middle part of the main guide rod (3) is rotatably connected to the lower end of the support rod, and the other end of the main guide rod (3) is rotatably connected to the upper end of the float (2).

4. The exhaust valve suitable for impurity conditions according to claim 2, characterized in that, The bottom surface of the conical sealing plug (5) is provided with a support rod, and the lower end of the support rod is connected to the upper end of the float (2).

5. The exhaust valve suitable for impurity conditions according to claim 1, characterized in that, The inner side of the exhaust channel (4) is provided with a breathable plate (8), and the surface of the breathable plate (8) is arranged with a number of breathable holes.

6. An exhaust valve suitable for impurity conditions according to claim 5, characterized in that, The upper end of the conical sealing plug (5) is provided with a sealing block (7), and the top surface of the sealing block (7) is provided with a sealing gasket (10), which is used to seal the vent hole.

7. An exhaust valve suitable for impurity conditions according to any one of claims 1-6, characterized in that, The elastic sealing ring (6) includes a sealing part (601) and a cleaning part (602). A sealing port surface (603) is provided on the inner side of the lower end of the sealing part (601). When the conical sealing plug (5) abuts against the sealing part (601), the sealing port surface (603) fits against the sealing surface of the conical sealing plug (5).

8. The exhaust valve suitable for impurity conditions according to claim 7, characterized in that, The cleaning part (602) has a first conical surface (604) on the inner side of its lower end. When the conical sealing plug (5) abuts against the sealing part (601), the first conical surface (604) fits against the sealing surface of the conical sealing plug (5). The cleaning part (602) has a second conical surface (605) on the inner side of its upper end. When the conical sealing plug (5) abuts against the cleaning part (602), the second conical surface (605) fits against the sealing surface of the conical sealing plug (5).

9. An exhaust valve suitable for impurity conditions according to any one of claims 1-6, characterized in that, The upper end of the valve cylinder (1) is provided with an assembly hole, and the upper end of the assembly hole is provided with a stepped groove (101). The outer side wall of the exhaust channel (4) is provided with an annular protrusion (401), and the annular protrusion (401) is snapped into the stepped groove (101).

10. An exhaust valve suitable for impurity conditions according to claim 9, characterized in that, The bottom surface of the stepped groove (101) is provided with an O-ring seal, which is fitted onto the outer wall of the exhaust channel (4), and the top surface of the O-ring seal is attached to the bottom surface of the annular protrusion (401).

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