High-pressure-difference large-flow drain valve

Abstract

The invention provides a high-pressure-difference large-flow drain valve, and relates to the technical field of drain valves, the high-pressure-difference large-flow drain valve comprises a valve body and a filter, the valve body is provided with an inlet flow channel, the filter is arranged at one end of the inlet flow channel and comprises a filter barrel, a connecting rod, a filter cover and sealing elements, and the sealing elements comprise a first sealing element and a second sealing element. The connecting rods comprise the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod, the first sealing pieces are correspondingly arranged on the first connecting rod and the second connecting rod to form a first sealing face and a second sealing face respectively, and the second sealing pieces are correspondingly arranged on the third connecting rod and the fourth connecting rod to form a third sealing face and a fourth sealing face respectively. And the four parts are arranged in a staggered manner, so that the connecting rod and the valve body form axial sealing at different radial positions. The filter and the valve body have multiple sealing guarantees, the sealing performance is good, the buffer plate is arranged to consume medium impact energy, and the service life of the filter is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of steam traps, and in particular to a steam trap with high pressure difference and large flow rate. Background Art

[0002] In the modern industrial process, steam plays a core role in many key fields such as electricity, chemical industry, petroleum, papermaking, and food processing due to its efficient energy transfer characteristics. The generation of condensed water is an inevitable natural phenomenon during the operation of the steam system. However, if the condensed water cannot be discharged in time and properly, it will bring a series of serious negative effects to the entire steam system, such as water hammer. Water hammer will not only create deafening noise and strong vibration, but also cause serious wear and damage to the pipeline and its connecting parts. In extreme cases, it may even cause the pipeline to rupture, resulting in major safety accidents.

[0003] For such high pressure difference and large flow conditions, the inverted bucket structure of the inverted bucket steam trap gives it an inherent advantage when it is subjected to high pressure difference. First, the inverted bucket opens downward, and this design makes it difficult for steam to directly impact the barrel body, reducing the impact of high-pressure steam on internal components. At the same time, the valve seat and valve disc are usually located at the top, away from impurities that may accumulate, reducing the wear of impurities on sealing components under high pressure difference, ensuring the sealing and stability under high pressure difference environment, and its internal structure is relatively simple, with fewer moving parts, reducing the possible failure points under high pressure due to complex components, and improving reliability; secondly, the inverted bucket type can respond in time even when a large flow of condensate continues to pour in, quickly opening the drainage channel to ensure the smooth discharge of condensate.

[0004] In addition, there will be impurity particles in steam and condensate, such as rust, welding slag, scale, etc. Under the condition of high pressure difference and large flow, if these impurities are not filtered, they will flow with the high speed of the fluid, which will not only accelerate the wear of sealing parts such as valve seat and valve disc, causing leakage of steam trap, but also may block the drainage channel and affect the normal drainage function of steam trap. In order to avoid the above problems, a filter is generally installed in the steam trap to filter these impurities, protect the precision parts inside the steam trap, ensure that it can operate stably for a long time under the harsh conditions of high pressure difference and large flow, reduce maintenance costs, and extend the overall service life of the steam trap. However, since the filter is usually detachably arranged at one end of the flow channel, it is easy for the medium to leak at the filter due to seal failure. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a high-pressure difference and large-flow steam trap.

[0006] The technical solution adopted by the present invention is as follows: A high-pressure difference and large-flow steam trap comprises a valve body, an inlet flow channel is arranged on one side of the valve body, a valve cavity is arranged in the valve body, and a filter is arranged at one end of the inlet flow channel, and the filter comprises a filter barrel, a connecting rod, a filter cover and a seal, the seal comprises a first seal and a second seal, the filter barrel is connected to the inlet flow channel and the valve cavity, one end of the connecting rod is connected to the filter cover and the other end is connected to the filter barrel, the filter cover is connected to the valve body, the connecting rod comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod in sequence from the filter barrel toward the filter cover, the first seal is correspondingly arranged on the first connecting rod and the second connecting rod, respectively forming a first sealing surface and a second sealing surface, the second seal is correspondingly arranged on the third connecting rod and the fourth connecting rod, respectively forming a third sealing surface and a fourth sealing surface, the first sealing surface, the second sealing surface, the third sealing surface and the fourth sealing surface are staggered, so that the connecting rod and the valve body form axial seals at different radial positions.

[0007] The first connecting rod and the second connecting rod form a first step, the first sealing member forms a fifth sealing surface with the valve body corresponding to the first step, the second connecting rod and the third connecting rod form a second step, the first sealing member is connected to the second step at one end away from the first connecting rod, the third connecting rod and the fourth connecting rod form a third step, the second sealing member forms a sixth sealing surface with the valve body corresponding to the third step, and the fifth sealing surface and the sixth sealing surface are both used to form a radial sealing fit between the valve body and the connecting rod.

[0008] The first connecting rod includes a first connecting part and a second connecting part. The diameter of the first connecting part gradually decreases along the direction approaching the filter cover, and the diameter of the second connecting part gradually increases along the direction approaching the filter cover. A bending part is formed at the junction of the first connecting part and the second connecting part. The shape of the first sealing surface matches the shape of the first connecting rod. The first sealing member is provided with a second mounting groove corresponding to the bending part. An O-ring is provided in the second mounting groove. The O-ring and the valve body form a seventh sealing surface.

[0009] The outer wall of the first connection portion may be a curved surface or a flat surface, and the outer wall of the second connection portion may be a curved surface or a flat surface.

[0010] The second sealing member extends toward the first connecting rod to form a first extension portion, the first extension portion is sleeved on the first sealing member and is located on the outside of the second connecting rod, the first extension portion is bent toward the central axis of the connecting rod to form a second extension portion, the first sealing member is located on the first step close to the inlet flow channel and is provided with a first mounting groove, and the second extension portion is arranged in the first mounting groove.

[0011] The high-pressure difference and large-flow steam trap described above also includes a limit column and a buffer plate, one end of the limit column is connected to the first connecting rod, and the buffer plate includes a mounting portion and a deformable first buffer portion, the mounting portion is connected to the inner wall of the filter barrel, and the first buffer portion is formed by bending the mounting portion toward the central axis of the limit column. The first buffer portion is sleeved on the limit column, and the end of the first buffer portion abuts against the outer wall of the limit column, so that the first buffer portion can be deformed and slide back and forth along the outer wall of the limit column when subjected to pressure.

[0012] A limiting protrusion is arranged at one end of the limiting column away from the filter cover.

[0013] The first buffer portion is extended away from one end of the first connecting rod toward the axis direction of the limiting column to form a second buffer portion, and the second buffer portion is connected to the limiting column at one end away from the limiting protrusion.

[0014] The high-pressure difference and large-flow steam trap further includes a spring, a groove is formed between the first buffer part and the second buffer part, the spring is sleeved in the second buffer part, one end of the spring is arranged in the groove and the other end abuts against the first sealing member.

[0015] The filter cover includes a front end, a middle end and a rear end, the fourth connecting rod is provided with a third mounting groove near one end of the filter cover, the front end is arranged in the third mounting groove, one end of the middle end is connected to the front end and the other end is connected to the rear end, the rear end is abutted against the end of the inlet flow channel, the outer periphery of the front end is provided with a first thread, the outer periphery of the middle end is provided with a second thread, the inner wall of the third mounting groove is provided with a third thread matched with the first thread, the inner wall of the inlet flow channel is provided with a fourth thread matched with the second thread, and the thread directions of the first thread and the second thread are opposite.

[0016] The beneficial effects of the present invention are as follows: 1. The filter and the valve body of the present invention have multiple sealing guarantees to prevent the medium from leaking at the connection between the filter and the valve body; 2. The buffer plate of the present invention can consume the impact energy of the medium, prolong the service life of the filter, and improve the sealing between the filter and the valve body; 3. The filter of the present invention has a medium diversion function and has a good filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0018] Figure 1 is a schematic diagram of the present invention; Figure 2 for Figure 1 A magnified view of middle; Figure 3 for Figure 1 Enlarged view of middle B; Figure 4 is a schematic diagram of a first filter element of the present invention; Figure 5 Schematic diagram of the filter barrel of the present invention Figure 1 ; Figure 6 is a schematic diagram of a second filter assembly of the present invention; Figure 7 Schematic diagram of the filter barrel of the present invention Figure 2 ; Figure 8 is a schematic diagram of an inverted bucket of the present invention; Fig. 9 for Figure 1 Enlarged view of C in the middle. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0020] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0021] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are for explaining and understanding the present invention, but not for limiting the scope of protection of the present invention.

[0022] like Figures 1 to 9 As shown, an embodiment of the present invention is provided: A high-pressure difference and large-flow steam trap includes a valve body 1 and a valve cover 20. The valve cover 20 is arranged at the upper end of the valve body 1. The valve body 1 is provided with an inlet flow channel 11 and an outlet flow channel 12 on both sides. The valve body 1 is provided with a valve cavity 13. The valve cavity 13 is provided with an inverted barrel 30. The inverted barrel 30 is communicated with the inlet flow channel 11. The valve cavity 13 is also provided with a main valve cage 40, a main valve seat 50 and a valve core 60. The lower end of the valve cover 20 is provided with a fourth mounting groove. The main valve cage 40 is arranged in the fourth mounting groove near one end of the valve cover 20. The main valve seat 50 is arranged in the main valve cage 40. The main valve seat 50 is provided with a second through hole. The second through hole is communicated with the outlet flow channel 12. The valve core 60 can move synchronously with the inverted barrel 30, so that the valve core 60 has a sealing state of sealing cooperation with the main valve seat 50 and a flow state of separation from the main valve seat 50. In addition, a piston 70 is disposed between the main valve cage 40 and the valve core 60 .

[0023] In order to filter the impurity particles in steam and condensate, and prevent these impurities from flowing with the fluid at high speed, causing the wear of the main valve seat and valve core, causing the steam trap to leak, and affecting the normal drainage function of the steam trap. The steam trap is also provided with a filter, which is arranged at one end of the inlet flow channel 11, and the filter includes a filter barrel 2, the filter barrel 2 includes a first filter element 21, a second filter assembly 22 and a third filter assembly, the first filter element 21 includes a first baffle portion 211, a filter portion 212 and a second baffle portion 213, the filter portion 212 is provided with a plurality of third through holes, and the third through holes are communicated with the valve cavity 13. The second filter assembly 22 is arranged in the first filter element 21 corresponding to the filter portion 212, and the second filter assembly 22 is provided with a plurality of fourth through holes, the fourth through holes are communicated with the third through holes, and the diameter of the fourth through holes is larger than the third through holes, so that the medium flows through the fourth through holes and the third through holes with gradually decreasing diameters in sequence, which greatly improves the filtering effect of the filter barrel 2. Specifically, the second filter assembly 22 includes a plurality of pairs of first filter plates 221 and second filter plates 222 arranged along the circumferential direction, and the first filter plates 221 and the second filter plates 222 are V-shaped, and the plurality of fourth through holes are evenly arranged on the first filter plates 221 and the second filter plates 222, which increases the contact area between the medium and the second filter assembly 22, so that the medium can be fully filtered. The second filter assembly 22 also includes a first mounting plate 223 and a second mounting plate 224, one end of the first filter plate 221 is connected to the first mounting plate 223 and the other end is connected to the second mounting plate 224, one end of the second filter plate 222 is connected to the first mounting plate 223 and the other end is connected to the second mounting plate 224, which increases the impact resistance of the second filter assembly 22 and prevents the second filter assembly 22 from being deformed and damaged due to the scouring of the medium when filtering the medium. The third filter assembly corresponds to the second partition portion 213 and is arranged in the first filter element 21. The third filter assembly includes a third filter plate 231, a fourth filter plate 232, a fifth filter plate 233 and two baffles 234. The third filter plate 231, the fourth filter plate 232 and the fifth filter plate 233 are evenly spaced along the axial direction. The baffle 234 is symmetrically arranged in the first filter element 21, and one end thereof is connected to the lower end of the second filter assembly 22, and the other end is connected to the fifth filter plate 233.The portion of the fifth filter plate 233 between the two baffles 234 is provided with a sixth through hole, the portion of the two baffles 234 between the fourth filter plate 232 and the fifth filter plate 233 is provided with a seventh through hole, the portion of the fourth filter plate 232 between the second partition plate 213 and the baffle 234 is provided with an eighth through hole, the portion of the two baffles 234 between the third filter plate 231 and the fourth filter plate 232 is provided with a ninth through hole, the portion of the third filter plate 231 between the two baffles 234 is provided with a tenth through hole, and the sixth through hole, the seventh through hole, the eighth through hole, the ninth through hole, the tenth through hole, and the second filter assembly are connected. The third filter assembly can not only perform multiple filtrations on the medium, but also play a guiding and drainage effect on the medium, reduce the impact of the medium on the filter, and increase the service life of the filter.

[0024] In order to prevent the medium from leaking at the filter, the filter further includes a connecting rod 3, a filter cover 4 and a seal. The seal includes a first seal 5 and a second seal 6. One end of the connecting rod 3 is connected to the filter cover 4 and the other end is connected to the filter barrel 2. The filter cover 4 is connected to the valve body 1. The connecting rod 3 includes a first connecting rod 31, a second connecting rod 32, a third connecting rod 33 and a fourth connecting rod 34 in sequence from the filter barrel 2 to the filter cover 4. The first seal 5 is correspondingly arranged on the first connecting rod 31 and the second connecting rod 32 to form a first sealing surface and a second sealing surface respectively. The second seal 6 is correspondingly arranged on the third connecting rod 33 and the fourth connecting rod 34 to form a third sealing surface and a fourth sealing surface respectively. The first sealing surface, the second sealing surface, the third sealing surface and the fourth sealing surface are all staggered, so that the connecting rod 3 and the valve body 1 form axial seals at different radial positions. Even if one of the sealing surfaces is damaged, the remaining sealing surfaces can still perform a sealing function to ensure that the medium will not leak, and the first sealing surface, the second sealing surface, the third sealing surface and the fourth sealing surface are all staggered. If the medium leaks from these positions, the flow path is tortuous, which further improves the sealing effect. Therefore, the possibility of sealing failure at the first sealing surface, the second sealing surface, the third sealing surface and the fourth sealing surface is getting smaller and smaller.

[0025] The first connecting rod 31 and the second connecting rod 32 form a first step, the first sealing member 5 forms a fifth sealing surface with the valve body 1 corresponding to the first step, the second connecting rod 32 and the third connecting rod 33 form a second step, the first sealing member 5 is connected to the second step at one end away from the first connecting rod 31, the third connecting rod 33 and the fourth connecting rod 34 form a third step, the second sealing member 6 forms a sixth sealing surface with the valve body 1 corresponding to the third step, and the fifth sealing surface and the sixth sealing surface are both used to form a radial sealing fit between the valve body 1 and the connecting rod 3. Thus, the first sealing member 5 and the second sealing member 6 form an axial and radial bidirectional seal between the connecting rod 3 and the valve body 1, so that the sealing surface forms a stepped shape, which greatly improves the sealing performance and reduces the risk of sealing failure.

[0026] Specifically, the first connecting rod 31 includes a first connecting portion and a second connecting portion. The diameter of the first connecting portion gradually decreases along the direction approaching the filter cover 4, and the diameter of the second connecting portion gradually increases along the direction approaching the filter cover 4. The shape of the first sealing surface matches the shape of the first connecting rod 31, so that the sealing performance of the first sealing surface at the first connecting rod 31 is greatly improved. The first seal 5 is the seal closest to the medium. Compared with the second seal 6, it is more easily damaged by medium erosion. The seal at this location has good adaptability to deformation and high pressure resistance due to the change in its own cross-sectional diameter, making it less likely to be damaged by medium erosion.

[0027] A bending portion is formed at the junction of the first connecting portion and the second connecting portion, and the first sealing member 5 is provided with a second mounting groove corresponding to the bending portion, and an O-ring 7 is provided in the second mounting groove, and the O-ring 7 forms a seventh sealing surface with the valve body 1. On the one hand, the provision of the O-ring 7 can form multiple sealing guarantees at the first connecting rod 31, reducing the risk of sealing failure there; on the other hand, the provision of the O-ring 7 at the bending portion can fill the installation gap caused by the shape of the first sealing member 5. This allows the first sealing member 5 to not only exert its sealing advantage caused by the change in diameter, but also avoid the first sealing member 5 from generating an installation gap. Specifically, the outer wall of the first connecting portion can be a curved surface or a flat surface, and the outer wall of the second connecting portion can be a curved surface or a flat surface. In this embodiment, the outer wall of the first connecting portion and the outer wall of the second connecting portion are both curved surfaces.

[0028] The second sealing member 6 extends toward the first connecting rod 31 to form a first extension portion 61. The first extension portion 61 is sleeved on the first sealing member 5 and is located on the outside of the second connecting rod 32. The first extension portion 61 is bent toward the central axis of the connecting rod 3 to form a second extension portion 62. The first sealing member 5 is located on the first step and is close to the inlet flow channel 11. A first mounting groove 51 is provided on the side. The second extension portion 62 is provided in the first mounting groove 51, which improves the reliability of the connection.

[0029] Furthermore, in order to reduce the deformation and damage of the filter barrel 2 due to the impact of the medium, a limiting column 8 and a buffer plate 9 are also provided. One end of the limiting column 8 is connected to the first connecting rod 31. The buffer plate 9 includes a mounting portion 91 and a deformable first buffer portion 92. The mounting portion 91 is connected to the inner wall of the filter barrel 2. Specifically, in this embodiment, the mounting portion 91 is connected to the inner wall of the first partition portion 211. The first buffer portion 92 is formed by bending the mounting portion 91 toward the central axis of the limiting column 8. The first buffer portion 92 is sleeved on the limiting column 8, and the end of the first buffer portion 92 abuts against the outer wall of the limiting column 8, so that the first buffer portion 92 can be deformed and reciprocate along the outer wall of the limiting column 8 when subjected to pressure. When the medium enters the filter barrel 2, the impact force of the medium can cause the first buffer portion 92 to deform and reciprocate along the outer wall of the limiting column 8, which can consume the capacity of the medium and reduce the impact force of the medium on the filter barrel 2. Specifically, the limiting column 8 is provided with a limiting protrusion 81 at one end away from the filter cover 4, which can limit the end of the first buffer portion 92, so that it can slide back and forth between the first connecting rod 31 and the limiting protrusion 81. The first buffer portion 92 is extended toward the axis direction of the limiting column 8 at one end away from the first connecting rod 31 to form a second buffer portion 93, and the second buffer portion 93 is connected to the limiting column 8 at one end away from the limiting protrusion 81, so as to improve the stability of the reciprocating motion of the first buffer portion 92 and quickly restore it to its original state after deformation.

[0030] In addition, a spring 95 is also provided. A groove 94 is formed between the first buffer portion 92 and the second buffer portion 93. The spring 95 is sleeved on the second buffer portion 93. One end of the spring 95 is provided in the groove 94 and the other end abuts against the first seal 5, so that the spring 95 can be driven by the first buffer portion 92 and the second buffer portion 93 to perform synchronous reciprocating motion, which not only further enhances the ability of the buffer plate 9 to consume the impact force of the medium, but also when impacted by the medium, the spring 95 generates pressure on the first seal 5, so that the first seal 5 is compressed and the sealing performance is improved, which is specifically manifested as: the first seal 5 at the first connecting portion and the second connecting portion, and the O-ring 7 are squeezed against each other, so that the seal is tighter, and the second seal 6 is provided in the first mounting groove 51 through the second extending portion 62, so that when the first seal 5 is compressed, the second seal 6 is also compressed, so as to further improve the sealing performance.

[0031] In order to facilitate the installation of the filter in the inlet flow channel 11, the filter cover 4 includes a front end 41, a middle end 42 and a rear end 43. The fourth connecting rod 34 is provided with a third installation groove near one end of the filter cover 4. The front end 41 is provided in the third installation groove. One end of the middle end 42 is connected to the front end 41 and the other end is connected to the rear end 43. The rear end 43 abuts against the end of the inlet flow channel 11, and a third sealing member 421 is provided between the rear end 43 and the inlet flow channel 11. The outer periphery of the front end 41 is provided with a first thread, the outer periphery of the middle end 42 is provided with a second thread, the inner wall of the third installation groove is provided with a third thread matched with the first thread, and the inner wall of the inlet flow channel 11 is provided with a fourth thread matched with the second thread, and the thread directions of the first thread and the second thread are opposite. The filter cover 4 and the connecting rod 3 can be assembled first, and then the two can be assembled together into the inlet flow channel 11, so as to improve the assembly efficiency. In addition, if damage occurs, some parts can be replaced, which saves costs. At the same time, when the filter is removed from the inlet flow channel 11, it can be prevented that the filter cover 4 and the connecting rod 3 become loose, causing the connecting rod 3 to remain in the inlet flow channel 11.

[0032] In order to improve the gas-liquid separation capability of the inverted bucket 30 and improve the drainage capability of the steam trap, a plurality of partition plates 301 are provided in the inverted bucket 30, and a fifth through hole 302 is provided in the middle of the partition plate 301. The fifth through hole 302 is a cone or a cylinder that is smaller at the top and larger at the bottom. In the present embodiment, the fifth through hole 302 is alternately cone-shaped and cylindrical-shaped.

[0033] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A high-pressure differential and high-flow steam trap, comprising a valve body (1), wherein one side of the valve body (1) is provided with an inlet flow channel (11), and a valve cavity (13) is provided inside the valve body (1), characterized in that: The invention also comprises a filter, wherein the filter is arranged at one end of the inlet flow channel (11), and the filter comprises a filter barrel (2), a connecting rod (3), a filter cover (4) and a sealing member, wherein the sealing member comprises a first sealing member (5) and a second sealing member (6), the filter barrel (2) is connected to the inlet flow channel (11) and the valve chamber (13), one end of the connecting rod (3) is connected to the filter cover (4) and the other end is connected to the filter barrel (2), the filter cover (4) is connected to the valve body (1), and the connecting rod (3) comprises a first connecting rod (5), a second connecting rod (6) and a second connecting rod (7) in a direction from the filter barrel (2) toward the filter cover (4). The valve body (1) is a valve body having a first connecting rod (31), a second connecting rod (32), a third connecting rod (33) and a fourth connecting rod (34); the first sealing member (5) is correspondingly arranged on the first connecting rod (31) and the second connecting rod (32), respectively forming a first sealing surface and a second sealing surface; the second sealing member (6) is correspondingly arranged on the third connecting rod (33) and the fourth connecting rod (34), respectively forming a third sealing surface and a fourth sealing surface; the first sealing surface, the second sealing surface, the third sealing surface and the fourth sealing surface are all arranged in a staggered manner, so that the connecting rod (3) and the valve body (1) form axial seals at different radial positions.

2. A high pressure difference and large flow steam trap according to claim 1, characterized in that: The first connecting rod (31) and the second connecting rod (32) form a first step, the first sealing member (5) forms a fifth sealing surface with the valve body (1) corresponding to the first step, the second connecting rod (32) and the third connecting rod (33) form a second step, the first sealing member (5) is connected to the second step at one end away from the first connecting rod (31), the third connecting rod (33) and the fourth connecting rod (34) form a third step, the second sealing member (6) forms a sixth sealing surface with the valve body (1) corresponding to the third step, and the fifth sealing surface and the sixth sealing surface are both used to form a radial sealing fit between the valve body (1) and the connecting rod (3).

3. A high pressure difference and large flow steam trap according to claim 2, characterized in that: The first connecting rod (31) comprises a first connecting portion and a second connecting portion, the diameter of the first connecting portion gradually decreases along the direction approaching the filter cover (4), the diameter of the second connecting portion gradually increases along the direction approaching the filter cover (4), a bending portion is formed at the junction of the first connecting portion and the second connecting portion, the shape of the first sealing surface matches the shape of the first connecting rod (31), the first sealing member (5) is provided with a second mounting groove corresponding to the bending portion, an O-type sealing ring (7) is provided in the second mounting groove, and the O-type sealing ring (7) forms a seventh sealing surface with the valve body (1).

4. A high pressure difference and large flow steam trap according to claim 3, characterized in that: The outer wall of the first connection portion may be a curved surface or a flat surface, and the outer wall of the second connection portion may be a curved surface or a flat surface.

5. A high pressure difference and large flow steam trap according to claim 4, characterized in that: The second sealing member (6) extends toward the first connecting rod (31) to form a first extension portion (61); the first extension portion (61) is sleeved on the first sealing member (5) and is located outside the second connecting rod (32); the first extension portion (61) is bent toward the central axis of the connecting rod (3) to form the second extension portion (62); the first sealing member (5) is provided with a first mounting groove (51) on one side of the first step close to the inlet flow channel (11); and the second extension portion (62) is arranged in the first mounting groove (51).

6. A high pressure difference and large flow steam trap according to claim 5, characterized in that: It also includes a limiting column (8) and a buffer plate (9), one end of the limiting column (8) is connected to the first connecting rod (31), the buffer plate (9) includes a mounting portion (91) and a deformable first buffer portion (92), the mounting portion (91) is connected to the inner wall of the filter barrel (2), the first buffer portion (92) is formed by bending the mounting portion (91) toward the central axis of the limiting column (8), the first buffer portion (92) is sleeved on the limiting column (8), and the end of the first buffer portion (92) abuts against the outer wall of the limiting column (8), so that the first buffer portion (92) can be deformed when subjected to pressure and reciprocate along the outer wall of the limiting column (8).

7. A high pressure difference and large flow steam trap according to claim 6, characterized in that: A limiting protrusion (81) is provided at one end of the limiting column (8) away from the filter cover (4).

8. The high pressure difference and large flow steam trap according to claim 7, characterized in that: The first buffer portion (92) extends away from one end of the first connecting rod (31) in the axial direction of the limiting column (8) to form a second buffer portion (93), and the second buffer portion (93) is connected to the limiting column (8) at one end away from the limiting protrusion (81).

9. A high pressure difference and large flow steam trap according to claim 8, characterized in that: It also includes a spring (95), a groove (94) is formed between the first buffer portion (92) and the second buffer portion (93), the spring (95) is sleeved on the second buffer portion (93), one end of the spring (95) is arranged in the groove (94) and the other end abuts against the first sealing member (5).

10. A high pressure difference and large flow steam trap according to claim 9, characterized in that: The filter cover (4) comprises a front end portion (41), a middle end portion (42) and a rear end portion (43); a third mounting groove is provided at one end of the fourth connecting rod (34) close to the filter cover (4); the front end portion (41) is arranged in the third mounting groove; one end of the middle end portion (42) is connected to the front end portion (41) and the other end is connected to the rear end portion (43); the rear end portion (43) abuts against the end of the inlet flow channel (11); a first thread is provided on the outer periphery of the front end portion (41); a second thread is provided on the outer periphery of the middle end portion (42); a third thread matched with the first thread is provided on the inner wall of the third mounting groove; a fourth thread matched with the second thread is provided on the inner wall of the inlet flow channel (11); the thread directions of the first thread and the second thread are opposite.

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