A high-pressure differential and large-flow steam trap

Abstract

The present invention provides a high-pressure differential and large-flow steam trap, which relates to the technical field of steam traps. It includes a valve body, and an inlet flow channel is arranged on the valve body. It further includes a filter, which is arranged at one end of the inlet flow channel and includes a filter barrel, a connecting rod, a filter cover and a sealing member. The sealing member includes a first sealing member and a second sealing member. The connecting rod includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod. The first sealing member 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 sealing member 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 four are all arranged staggeredly, so that the connecting rod and the valve body form axial seals at different radial positions. The filter of the present invention and the valve body have multiple sealing guarantees, good sealing performance, and a buffer plate is provided to consume the impact energy of the medium, thus prolonging the service life of the filter.

Description

Technical Field

[0001] The present invention relates to the technical field of steam traps, and particularly to a high-pressure differential and large-flow steam trap. Background Art

[0002] In the modern industrial process, steam plays a core role in many key fields such as electricity, chemical industry, petroleum, paper-making, and food processing due to its efficient energy transfer characteristics. During the operation of the steam system, the generation of condensate is an inevitable natural phenomenon. However, if this condensate cannot be discharged in a timely and proper manner, it will bring a series of serious negative effects to the entire steam system. For example, water hammer phenomenon. Water hammer not only produces deafening noise and strong vibration, causing serious wear and damage to pipelines and their connecting components, but in extreme cases, it may even cause the pipeline to rupture, resulting in major safety accidents.

[0003] For such a high-pressure differential and large-flow working condition, the inverted bucket structure of the inverted bucket steam trap has inherent advantages when bearing high pressure differential. First of all, the opening of the inverted bucket is downward. This design makes it difficult for steam to directly impact the bucket body, reducing the impact force of high-pressure steam on internal components. At the same time, the valve seat and valve flap are usually located at the top, far from the impurities that may accumulate, reducing the wear of the sealing components by impurities under high pressure differential, ensuring the sealing performance and stability in a high-pressure differential environment, and its internal structure is relatively simple with fewer moving parts, reducing the possible failure points due to complex components under high pressure, and improving the reliability. Secondly, even when a large flow of condensate continuously surges in, the inverted bucket type can respond in a timely manner and quickly open 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 working condition of high-pressure differential and large flow, if these impurities are not filtered, they will flow at high speed with the fluid, which will not only accelerate the wear of sealing components such as valve seats and valve flaps, resulting in steam trap leakage, but also may block the drainage channel, affecting the normal drainage function of the steam trap. In order to avoid the above problems, generally a filter is provided in the steam trap to filter these impurities, protect the precision components inside the steam trap, ensure that it can operate stably for a long time under the harsh conditions of high-pressure differential and large flow, reduce the maintenance cost, 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 to occur leakage of the medium at the filter due to seal failure. Summary of the Invention

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

[0006] The technical solution adopted by the present invention is as follows: A high-pressure differential and large-flow steam trap includes a valve body. An inlet flow channel is provided on one side of the valve body. A valve cavity is provided inside the valve body. The steam trap further includes a filter. The filter is arranged at one end of the inlet flow channel. The filter includes a filter barrel, a connecting rod, a filter cover and a seal. The seal includes a first seal and a second seal. The filter barrel is communicated with 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 sequentially includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod from the direction of the filter barrel towards the filter cover. The first seal is correspondingly arranged on the first connecting rod and the second connecting rod, forming a first sealing surface and a second sealing surface respectively. The second seal is correspondingly arranged on the third connecting rod and the fourth connecting rod, forming 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 arranged staggeredly, so that axial seals are formed between the connecting rod and the valve body at different radial positions.

[0007] The first connecting rod and the second connecting rod form a first step. The first seal forms a fifth sealing surface corresponding to the first step and the valve body. The second connecting rod and the third connecting rod form a second step. One end of the first seal away from the first connecting rod is connected to the second step. The third connecting rod and the fourth connecting rod form a third step. The second seal forms a sixth sealing surface corresponding to the third step and the valve body. Both the fifth sealing surface and the sixth sealing surface are used to form a radial sealing fit between the valve body and the connecting rod.

[0008] The first connecting rod includes a first connecting portion and a second connecting portion. The diameter of the first connecting portion gradually decreases along the direction close to the filter cover. The diameter of the second connecting portion gradually increases along the direction close to the filter cover. A bending portion is formed at the connection between the first connecting portion and the second connecting portion. The shape of the first sealing surface matches the shape of the first connecting rod. The second seal is provided with a second installation groove corresponding to the bending portion. An O-ring is arranged in the second installation groove. The O-ring forms a seventh sealing surface with the valve body.

[0009] The outer wall of the first connecting portion can be a curved surface or a plane. The outer wall of the second connecting portion can be a curved surface or a plane.

[0010] The second seal extends towards the first connecting rod to form a first extension portion. The first extension portion is sleeved on the first seal and is located outside the second connecting rod. The first extension portion bends towards the central axis direction of the connecting rod to form a second extension portion. The first seal is provided with a first installation groove on the side close to the inlet flow channel of the first step. The second extension portion is arranged in the first installation groove.

[0011] The described high-pressure differential and large-flow steam trap further includes a limit post and a buffer plate. One end of the limit post is connected to the first connecting rod. 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. The first buffer portion is bent from the mounting portion towards the central axis direction of the limit post. The first buffer portion is sleeved on the limit post, and the end of the first buffer portion abuts against the outer wall of the limit post, so that the first buffer portion can be deformed and reciprocally slide along the outer wall of the limit post when subjected to pressure.

[0012] A limit bump is provided at one end of the limit post away from the filter cover.

[0013] One end of the first buffer portion away from the first connecting rod extends towards the axis direction of the limit post to form a second buffer portion. One end of the second buffer portion away from the limit bump is connected to the limit post.

[0014] The described high-pressure differential and large-flow steam trap further includes a spring. A groove is formed between the first buffer portion and the second buffer portion. The spring is sleeved on the second buffer portion. One end of the spring is arranged in the groove and the other end abuts against the first seal.

[0015] The filter cover includes a front end portion, a middle end portion and a rear end portion. A third mounting groove is provided at one end of the fourth connecting rod close to the filter cover. The front end portion is arranged in the third mounting groove. One end of the middle end portion is connected to the front end portion and the other end is connected to the rear end portion. The rear end portion abuts against the end portion of the inlet flow channel. A first thread is provided on the outer periphery of the front end portion. A second thread is provided on the outer periphery of the middle end portion. A third thread adapted to the first thread is provided on the inner wall of the third mounting groove. A fourth thread adapted to the second thread is provided on the inner wall of the inlet flow channel. The thread directions of the first thread and the second thread are opposite.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The filter and the valve body of the present invention have multiple sealing guarantees, avoiding leakage of the medium at the connection between the filter and the valve body.

[0018] 2. The buffer plate of the present invention can consume the impact energy of the medium, extend the service life of the filter, and improve the sealing performance between the filter and the valve body.

[0019] 3. The filter of the present invention has a medium diversion function and good filtering effect. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still falls within the scope of the present invention.

[0021] Figure 1 Schematic diagram of the present invention;

[0022] Figure 2 is Figure 1 Enlarged view of A in

[0023] Figure 3 is Figure 1 Enlarged view of B in

[0024] Figure 4 Schematic diagram of the first filter element of the present invention;

[0025] Figure 5 Schematic of the filter bucket of the present invention Figure 1 ;

[0026] Figure 6 Schematic diagram of the second filter assembly of the present invention;

[0027] Figure 7 Schematic of the filter bucket of the present invention Figure 2 ;

[0028] Figure 8 Schematic diagram of the inverted bucket of the present invention;

[0029] Figure 9 is Figure 1 Enlarged view of C in Detailed implementation manners

[0030] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the following will further elaborate on the present invention in combination with specific embodiments. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those of ordinary skill in the art without creative efforts all fall within the protection scope of the present invention.

[0031] It should be noted that all the expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two entities or parameters with the same name but different identities. It can be seen that "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present invention. This will not be elaborated one by one in the subsequent embodiments.

[0032] The directional and positional terms mentioned in the present invention, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "top", "bottom", "side", etc., are only with reference to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding the present invention, rather than limiting the protection scope of the present invention.

[0033] As Figures 1 to 9 shown, an embodiment provided by the present invention is as follows:

[0034] A high-pressure differential 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. An inlet flow channel 11 and an outlet flow channel 12 are respectively arranged on both sides of the valve body 1. A valve cavity 13 is arranged inside the valve body 1. An inverted bucket 30 is arranged inside the valve cavity 13, and the inverted bucket 30 communicates with the inlet flow channel 11. A main valve cage 40, a main valve seat 50 and a valve core 60 are also arranged inside the valve cavity 13. A fourth installation groove is arranged at the lower end of the valve cover 20. One end of the main valve cage 40 close to the valve cover 20 is arranged in the fourth installation groove. The main valve seat 50 is arranged inside the main valve cage 40. The main valve seat 50 is provided with a second through hole which communicates with the outlet flow channel 12. And the valve core 60 can move synchronously with the inverted bucket 30, so that the valve core 60 has a sealing state of sealingly cooperating with the main valve seat 50 and a flowing state of being separated from the main valve seat 50. In addition, a piston 70 is arranged between the main valve cage 40 and the valve core 60.

[0035] In order to filter out the impurity particles existing in the steam and condensate, and avoid the wear of the main valve seat and the valve core caused by the high-speed flow of these impurities with the fluid, resulting in the leakage of the steam trap and affecting the normal drainage function of the steam trap. The steam trap is also provided with a filter, the filter 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 partition part 211, a filtering part 212 and a second partition part 213, the filtering part 212 is provided with a number of third through holes, and the third through holes communicate with the valve cavity 13. The second filter assembly 22 is arranged in the first filter element 21 corresponding to the filtering part 212, the second filter assembly 22 is provided with a number of fourth through holes, the fourth through holes communicate with the third through holes, and the diameter of the fourth through holes is larger than that of 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, greatly improving the filtering effect of the filter barrel 2. Specifically, the second filter assembly 22 includes a number of pairs of first filter plates 221 and second filter plates 222 arranged circumferentially, and the first filter plates 221 and the second filter plates 222 are in a V shape, and a number of the fourth through holes are evenly arranged on the first filter plates 221 and the second filter plates 222, increasing 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, improving the impact resistance of the second filter assembly 22 and avoiding deformation and damage of the second filter assembly 22 due to the erosion of the medium during filtering. The third filter assembly is arranged in the first filter element 21 corresponding to the second partition part 213, 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 baffles 234 are symmetrically arranged in the first filter element 21, and one end of the baffles 234 is connected to the lower end of the second filter assembly 22 and the other end is connected to the fifth filter plate 233.A sixth through-hole is provided in the part of the fifth filter plate 233 located between the two baffles 234, a seventh through-hole is provided in the part of the two baffles 234 located between the fourth filter plate 232 and the fifth filter plate 233, an eighth through-hole is provided in the part of the fourth filter plate 232 located between the second partition part 213 and the baffle 234, a ninth through-hole is provided in the part of the two baffles 234 located between the third filter plate 231 and the fourth filter plate 232, a tenth through-hole is provided in the part of the third filter plate 231 located between the two baffles 234, and the sixth through-hole, the seventh through-hole, the eighth through-hole, the ninth through-hole, the tenth through-hole communicate with the second filter assembly. The third filter assembly can not only perform multiple filtrations on the medium, but also play a role in guiding and draining the medium, reducing the impact of the medium on the filter and improving the service life of the filter.

[0036] 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 sequentially includes a first connecting rod 31, a second connecting rod 32, a third connecting rod 33 and a fourth connecting rod 34 in the direction 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, respectively forming a first sealing surface and a second sealing surface. The second seal 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 staggeredly, so that the connecting rod 3 and the valve body 1 form an axial seal at different radial positions. Even if one of the sealing surfaces is damaged, the remaining sealing surfaces can still play a sealing role to ensure that the medium does not leak. Moreover, the first sealing surface, the second sealing surface, the third sealing surface and the fourth sealing surface are all arranged staggeredly. If the medium wants to leak from these positions, the flow path is tortuous, further improving 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 becomes smaller and smaller.

[0037] The first connecting rod 31 and the second connecting rod 32 form a first step. The first seal 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. One end of the first seal 5 away from the first connecting rod 31 is connected to the second step. The third connecting rod 33 and the fourth connecting rod 34 form a third step. The second seal 6 forms a sixth sealing surface with the valve body 1 corresponding to the third step. And both the fifth sealing surface and the sixth sealing surface are used to form a radial sealing fit between the valve body 1 and the connecting rod 3. Thus, the first seal 5 and the second seal 6 enable a two-way seal in the axial and radial directions between the connecting rod 3 and the valve body 1, making the sealing surface in a stepped shape, greatly improving the sealing performance and reducing the risk of seal failure.

[0038] 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 close to the filter cover 4, and the diameter of the second connecting portion gradually increases along the direction close to the filter cover 4. The shape of the first sealing surface matches the shape of the first connecting rod 31, greatly improving the sealing performance of the first sealing surface at the first connecting rod 31. As the first seal 5 is the seal closest to the medium, it is more likely to be damaged by medium erosion compared to the second seal 6. However, due to the change in its own cross-sectional diameter at this place, it has good adaptability to deformation and high compressive resistance, making it not easily damaged by medium erosion.

[0039] A bending portion is formed at the junction of the first connecting portion and the second connecting portion. The first seal 5 is provided with a second installation groove corresponding to the bending portion. An O-ring 7 is arranged in the second installation groove. The O-ring 7 forms a seventh sealing surface with the valve body 1. On the one hand, arranging the O-ring 7 can form multiple sealing guarantees at the first connecting rod 31, reducing the risk of seal failure at this place. On the other hand, arranging the O-ring 7 at the bending portion can fill the installation gap generated by the shape of the first seal 5. This enables the first seal 5 to not only exert its sealing advantage due to diameter change but also avoid 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 walls of both the first connecting portion and the second connecting portion are curved surfaces.

[0040] The second seal 6 extends towards the first connecting rod 31 to form a first extension 61. The first extension 61 is sleeved on the first seal 5 and is located outside the second connecting rod 32. The first extension 61 is bent towards the central axis of the connecting rod 3 to form a second extension 62. The first seal 5 is provided with a first installation groove 51 on one side close to the inlet flow channel 11 of the first step. The second extension 62 is arranged in the first installation groove 51, improving the reliability of the connection.

[0041] Moreover, in order to reduce the deformation and damage of the filter barrel 2 caused by the impact of the medium, a limiting post 8 and a buffer plate 9 are also provided. One end of the limiting post 8 is connected to the first connecting rod 31. The buffer plate 9 includes an installation part 91 and a deformable first buffer part 92. The installation part 91 is connected to the inner wall of the filter barrel 2. Specifically, in this embodiment, the installation part 91 is connected to the inner wall of the first partition part 211. The first buffer part 92 is bent from the installation part 91 towards the central axis of the limiting post 8. The first buffer part 92 is sleeved on the limiting post 8, and the end of the first buffer part 92 abuts against the outer wall of the limiting post 8, so that the first buffer part 92 can be deformed and reciprocally slide along the outer wall of the limiting post 8 when subjected to pressure. When the medium enters the filter barrel 2, the impact force of the medium can cause the first buffer part 92 to deform and reciprocally slide along the outer wall of the limiting post 8, consuming the energy of the medium and reducing the impact force of the medium on the filter barrel 2. Specifically, a limiting protrusion 81 is provided at one end of the limiting post 8 away from the filter cover 4, which can form a limiting effect on the end of the first buffer part 92, making it reciprocally slide between the first connecting rod 31 and the limiting protrusion 81. One end of the first buffer part 92 away from the first connecting rod 31 extends towards the axis of the limiting post 8 to form a second buffer part 93. One end of the second buffer part 93 away from the limiting protrusion 81 is connected to the limiting post 8, improving the stability of the reciprocating motion of the first buffer part 92 and enabling it to quickly return to its original state after deformation.

[0042] Moreover, a spring 95 is also provided. A groove 94 is formed between the first buffer part 92 and the second buffer part 93. The spring 95 is sleeved on the second buffer part 93. One end of the spring 95 is arranged 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 part 92 and the second buffer part 93 to perform synchronous reciprocating activities. This not only further enhances the ability of the buffer plate 9 to consume the impact force of the medium, but also when subjected to the impact of the medium, the spring 95 generates pressure on the first seal 5, making the first seal 5 be pressed tightly, improving the sealing performance. Specifically, the first seal 5 at the first connection part and the second connection part and the O-ring 7 are mutually extruded, making the seal tighter. And, the second seal 6 is arranged in the first installation groove 51 through the second extension 62. When the first seal 5 is pressed tightly, the second seal 6 is also pressed tightly, further improving the sealing performance.

[0043] To facilitate the installation of the filter into the inlet flow channel 11, the filter cover 4 includes a front end portion 41, a middle end portion 42, and a rear end portion 43. A third installation groove is provided at one end of the fourth connecting rod 34 close to the filter cover 4. The front end portion 41 is disposed in the third installation 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, and a third seal 421 is provided between the rear end portion 43 and 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 adapted to the first thread is provided on the inner wall of the third installation groove, and a fourth thread adapted to 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. The filter cover 4 and the connecting rod 3 can be assembled first, and then the two can be assembled into the inlet flow channel 11 together, which improves the assembly efficiency. And if there is damage, parts can be replaced partially, saving costs. At the same time, when the filter is disassembled from the inlet flow channel 11, it can prevent the filter cover 4 and the connecting rod 3 from loosening, which may cause the connecting rod 3 to remain in the inlet flow channel 11.

[0044] To improve the gas-liquid separation ability of the inverted bucket 30 and enhance the liquid drainage capacity of the steam trap, a plurality of partition plates 301 are provided in the inverted bucket 30. A fifth through hole 302 is provided in the middle of the partition plate 301. The fifth through hole 302 is a tapered or cylindrical shape with a smaller upper part and a larger lower part. In this embodiment, the fifth through holes 302 are distributed alternately in a tapered and cylindrical shape.

[0045] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by 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) comprises a first connecting rod (31), a second connecting rod (32), a third connecting rod (33) and a fourth connecting rod (34), wherein 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, and 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; 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).

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: A limiting protrusion (81) is provided at one end of the limiting column (8) away from the filter cover (4).

7. A high pressure difference and large flow steam trap according to claim 6, 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).

8. The high pressure difference and large flow steam trap according to claim 7, 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).

9. A high pressure difference and large flow steam trap according to claim 8, 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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