Inverted bucket type drain valve with backflow prevention function

Abstract

The utility model belongs to the technical field of steam drain valves, and discloses an inverted bucket type drain valve with an anti-backflow function. The inverted bucket type drain valve comprises a valve body and a valve cover arranged on the valve body in a covering mode, a valve body cavity of the valve body and a first section of water outlet pipeline of the valve cover are controlled to be connected or disconnected through an inner valve assembly, and an anti-backflow structure is arranged in the first section of water outlet pipeline. The anti-backflow structure comprises a first connecting screw plug, a second connecting screw plug and a third connecting screw plug, the blocking ball is arranged in the first section of water outlet pipeline; one end of the spring is connected to the first connecting screw plug, and the other end is connected to the blocking ball; and under the condition that the valve body cavity and the first section of water outlet pipeline are cut off, the spring enables the blocking ball to abut against the first section of water outlet pipeline, so that the water inlet of the first section of water outlet pipeline and the water outlet of the main water outlet pipeline are cut off. According to the utility model, the anti-backflow structure is arranged, so that the problem that external gas / liquid flows back to influence the water seal in the valve body and the pressure difference stability is avoided, and the problem of overflow of steam is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam traps, and specifically relates to an inverted bucket steam trap with a reverse flow prevention function. Background Art

[0002] In large factories such as chemical plants and thermal power plants, high-temperature steam is often required. When high-temperature steam is in the steam pipeline, due to various working condition changes or start-stop operations, steam condensate often occurs. The inverted bucket steam trap is often used in the superheated steam system because it can resist high pressure and discharge air.

[0003] For the existing inverted bucket steam trap, there must be enough water inside the valve body, at least to ensure that a water seal is formed above the lower edge of the inverted bucket. If the water seal is lost or insufficient, steam backflow is likely to occur. In applications, such things often happen: when the steam pressure suddenly decreases, some of the condensate inside the valve body will flash into steam, the inverted bucket loses buoyancy and sinks, and the linkage passage cannot be automatically closed, resulting in steam leakage at the outlet, causing steam leakage and waste; at the same time, due to the loss of the water seal, steam flows back from the outlet air and flows back into the pipeline, causing changes in working conditions, which may lead to abnormal equipment states or even damage.

[0004] Therefore, there is an urgent need to provide an inverted bucket steam trap with a reverse flow prevention function that can effectively solve steam backflow to solve the above problems.

[0005] In view of this, the present application is specifically proposed. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to overcome the deficiency that the prior art cannot effectively solve the steam backflow problem. The purpose is to provide an inverted bucket steam trap with a reverse flow prevention function to solve the above problems.

[0007] To solve the above technical problem, the basic concept of the technical solution adopted by the utility model is: an inverted bucket steam trap with a reverse flow prevention function, including a valve body and a valve cover covering the valve body. The valve body cavity of the valve body and the first section of the water outlet pipeline of the valve cover are controlled to be conducted or cut off by an internal valve component, and a reverse flow prevention structure is arranged in the first section of the water outlet pipeline;

[0008] The reverse flow prevention structure includes:

[0009] A first connecting plug, which is installed on the first installation port of the valve cover by a connection method of matching internal and external threads;

[0010] A blocking ball, which is arranged on one side of the first section of the water outlet pipeline close to the water inlet of the first section of the water outlet pipeline;

[0011] A spring, one end of the spring is connected to the threaded end of the first connecting plug, and the other end of the spring is connected to the blocking ball;

[0012] Wherein, when the valve body cavity is cut off from the first section of the water outlet pipe, the spring supports the blocking ball and presses the blocking ball against the first section of the water outlet pipe to cut off the water inlet of the first section of the water outlet pipe from the water outlet of the total water outlet pipe; when the valve body cavity is communicated with the first section of the water outlet pipe, the water flow pushes the blocking ball and the spring to move in the direction close to the first connecting plug, so as to communicate the water inlet of the first section of the water outlet pipe with the water outlet of the total water outlet pipe.

[0013] According to an embodiment of the present invention, wherein the first section of the water outlet pipe includes: a first vertical section, a first horizontal section, a second horizontal section and a second vertical section which are sequentially connected and all have a cylindrical passage structure;

[0014] One end of the first vertical section is vertically communicated with the first horizontal section, and the port at the other end of the first vertical section is the water inlet;

[0015] The first horizontal section is parallel and communicated with the second horizontal section, and the passage diameter of the first horizontal section is smaller than the passage diameter of the second horizontal section; the blocking ball is arranged in the second horizontal section; the diameter of the blocking ball is equal to the passage diameter of the second horizontal section, or the diameter of the blocking ball is larger than the passage diameter of the first horizontal section and smaller than the passage diameter of the second horizontal section; when the valve body cavity is cut off from the first section of the water outlet pipe, the spring presses the blocking ball against the connection between the first horizontal section and the second horizontal section;

[0016] The first connecting plug is arranged at one end of the second horizontal section far away from the first horizontal section;

[0017] The second horizontal section is vertically communicated with the second vertical section.

[0018] According to an embodiment of the present invention, wherein a second section of the water outlet pipe is further arranged on the valve body, the second section of the water outlet pipe is correspondingly communicated with the first section of the water outlet pipe, and the first section of the water outlet pipe and the second section of the water outlet pipe form the total water outlet pipe;

[0019] The water outlet of the total water outlet pipe is arranged at one end of the second section of the water outlet pipe far away from the first section of the water outlet pipe;

[0020] The inverted bucket type steam trap further includes: a ring cylinder, and the ring cylinder is arranged at the connection between the first section of the water outlet pipe and the second section of the water outlet pipe.

[0021] According to an embodiment of the present utility model, a valve inlet pipeline is further provided inside the valve body, and the valve inlet pipeline is communicated with the valve body cavity;

[0022] A cylindrical filter screen is arranged inside the valve inlet pipeline, and at least a part of the cylindrical filter screen is attached to the inner wall of the valve inlet pipeline;

[0023] The inlet water and / or steam flows into the cylindrical filter screen through the central hollow part of the cylindrical filter screen, and then flows into the valve body cavity through the side wall of the cylindrical filter screen.

[0024] According to an embodiment of the present utility model, the inverted bucket type steam trap further includes: a second connecting plug, which is installed on the second installation port of the valve body by a connection method of internal and external thread cooperation, and one end of the second connecting plug extending into the valve body abuts against the cylindrical filter screen;

[0025] The horizontal height of the second connecting plug is lower than the horizontal height of the first connecting plug;

[0026] The second connecting plug and the first connecting plug are located on the same side of the valve body.

[0027] According to an embodiment of the present utility model, the inverted bucket type steam trap further includes: a connecting cylinder, at least a part of which is sleeved inside the water inlet of the first section of the water outlet pipeline;

[0028] When the valve body cavity is cut off from the first section of the water outlet pipeline, at least a part of the valve core of the inner valve assembly is inserted into the central shaft hole of the connecting cylinder.

[0029] According to an embodiment of the present utility model, the part of the valve core of the inner valve assembly extending into the central shaft hole is a frustum-shaped structure with a smooth top.

[0030] According to an embodiment of the present utility model, the inner valve assembly further includes:

[0031] A fixing piece, the main body of which is an L-shaped structural member; one end of the fixing piece is provided with a first installation position, and the other end of the fixing piece is provided with a second installation position, and the first installation position and the second installation position are arranged perpendicular to each other; the first installation position is connected to the valve body or the valve cover;

[0032] A support piece, the mating end of which is rotatably connected to the second installation position, and the valve core is arranged on the side of the support piece facing the first installation position; along the direction away from the mating end and the fixing piece, the extending length of the support piece is less than the extending length of the valve core.

[0033] According to an embodiment of the present utility model, a hooking hole is provided at one end of the valve core away from the mating end.

[0034] The inverted bucket type steam trap further includes: an inverted bucket disposed in the valve body cavity; one end of the inverted bucket close to the valve cover is closed to form a closed end, and an air hole is provided on the closed end.

[0035] A hooking linkage member is further provided on the closed end, and the hooking linkage member is hooked in the hooking hole; the inverted bucket moves up and down according to the change of water vapor in the valve body cavity, driving the inner valve assembly to rotate around the rotation center of the support piece and the fixed piece, thereby realizing the control of the conduction or cut-off of the valve body cavity of the valve body and the first section of the water outlet pipeline of the valve cover.

[0036] According to an embodiment of the present utility model, a sealing gasket is provided between the valve body and the valve cover.

[0037] After adopting the above technical solution, the present utility model has the following beneficial effects compared with the prior art.

[0038] 1) In the present utility model, by providing the anti-backflow structure, when there is no water flow in the inverted bucket type steam trap, the total water outlet pipeline is cut off, which not only avoids the occurrence of problems such as external gas / liquid backflow affecting the water seal and pressure difference stability in the valve body cavity, but also avoids the problem of steam overflow.

[0039] 2) In the present utility model, by providing the cylindrical filter screen, the steam or low-temperature condensed water entering through the inlet valve pipeline is filtered, avoiding foreign objects from entering the valve body and preventing the valve body from being blocked or potentially threatening its lifespan.

[0040] 3) In the present utility model, by providing the structure with a smooth-topped frustum shape on the valve core, the frustum-like structural design enables the valve core to move closer to the central shaft hole of the connecting cylinder when the valve core is worn, re-making the valve core fit tightly with the central shaft hole. Compared with the hemispherical structural design in the existing design, it can better resist wear and has a longer service life.

[0041] The following further describes in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0042] The accompanying drawings, as part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative efforts. In the accompanying drawings:

[0043] Figure 1 It is a schematic structural view of an inverted bucket type steam trap with a backflow prevention function in an embodiment of the present utility model;

[0044] Figure 2 It is a schematic structural view of an inverted bucket type steam trap with a backflow prevention function from another perspective in an embodiment of the present utility model;

[0045] Figure 3 Is along Figure 2 The structural cross-sectional view in the A-A direction in;

[0046] Figure 4 It is a schematic structural view of the inverted bucket in a top view perspective in an embodiment of the present utility model;

[0047] Figure 5 Is along Figure 4 The structural cross-sectional view in the B-B direction in;

[0048] Figure 6 It is a schematic structural view of the valve cover in a top view perspective in an embodiment of the present utility model;

[0049] Figure 7 Is along Figure 6 The structural cross-sectional view in the C-C direction in;

[0050] Figure 8 It is a structural cross-sectional view of the valve body in an embodiment of the present utility model;

[0051] Figure 9 It is a schematic structural view of the backflow prevention structure in an embodiment of the present utility model;

[0052] Figure 10 It is a schematic structural view of some components of the inner valve assembly in an embodiment of the present utility model;

[0053] Figure 11 Is along Figure 10 The structural cross-sectional view in the D-D direction in;

[0054] Figure 12 It is a schematic structural view of the fixing piece in an embodiment of the present utility model;

[0055] Figure 13 It is a schematic structural view of the connecting cylinder in an embodiment of the present utility model.

[0056] Description of the main components in the figure:

[0057] 1. Valve body; 11. Valve body cavity; 12. Second section of the water outlet pipeline; 13. Inlet valve pipeline; 131. Inlet valve port; 14. Cylindrical filter net; 15. Second connection plug; 151. Protrusion; 16. Sealing gasket; 17. First pipe section; 18. Second pipe section; 19. Connecting pipe section; 2. Valve cover; 21. First section of the water outlet pipeline; 22. First installation port; 23. Water inlet; 24. Water outlet; 25. First vertical section; 26. First horizontal section; 27. Second horizontal section; 28. Second vertical section; 29. Second installation port; 3. Inner valve assembly; 31. Valve core; 32. Fixed piece; 33. First installation position; 34. Second installation position; 35. Support piece; 36. Fitting end; 37. Hook hole; 4. Anti-backflow structure; 41. First connection plug; 42. Blocking ball; 43. Spring; 5. Ring cylinder; 51. First installation groove; 52. Second installation groove; 6. Connecting cylinder; 61. Central shaft hole; 7. Inverted bucket; 71. Air hole; 8. Hook linkage component.

[0058] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Specific embodiments

[0059] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0060] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0061] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0062] As Figures 1 to 13 shown, a bucket - inverted steam trap with a back - flow prevention function according to the present utility model includes a valve body 1 and a valve cover 2 covering the valve body 1. A control valve assembly 3 controls the on - off of the communication between the valve body cavity 11 of the valve body 1 and the first - stage water outlet pipe 21 of the valve cover 2, and a back - flow prevention structure 4 is arranged in the first - stage water outlet pipe 21 of the valve cover 2.

[0063] The back - flow prevention structure 4 includes:

[0064] A first connection plug 41, which is installed on a first installation port 22 arranged on the side wall of the valve cover 2 by a connection method of internal and external thread matching;

[0065] A blocking ball 42, which is arranged on one side of the first - stage water outlet pipe 21 close to the water inlet 23 of the first - stage water outlet pipe 21;

[0066] A spring 43, one end of which is connected to the threaded end of the first connection plug 41, and the other end of the spring 43 is connected to the blocking ball 42;

[0067] Among them, when there is no water flowing out of the valve body (the valve body cavity 11 and the first - stage water outlet pipe 21 are cut off), the spring 43 supports the blocking ball 42 and abuts the blocking ball 42 against the first - stage water outlet pipe 21 to cut off the water inlet 23 of the first - stage water outlet pipe 21 from the water outlet 24 of the total water outlet pipe; when water flows out of the valve body (the valve body cavity 11 and the first - stage water outlet pipe 21 are in communication), the water flow pushes the blocking ball 42 and the spring 43 to move towards the direction close to the first connection plug 41 (the spring 43 is compressed) to connect the water inlet 23 of the first - stage water outlet pipe 21 with the water outlet 24 of the total water outlet pipe.

[0068] In the present utility model, by setting the back - flow prevention structure 4, when there is no water flow in the bucket - inverted steam trap, the total water outlet pipe is cut off, which not only avoids the occurrence of problems such as the back - flow of external gas / liquid affecting the water seal and pressure difference stability in the valve body cavity 11, but also avoids the problem of steam overflow.

[0069] Please refer to Appendix Figure 1 to Appendix Figure 3 Appendix Figure 6 Appendix Figure 7 Appendix Figure 9, in a specific implementation manner of this embodiment, one end of the first connecting plug 41 is provided with an external thread structure (the threaded end of the first connecting plug 41), and the first mounting opening 22 is provided with an internal thread structure matching the external thread structure of the first connecting plug 41. The first connecting plug 41 is connected to the first mounting opening 22 by means of internal and external thread connection.

[0070] In a specific implementation manner of this embodiment, the outer diameter of the spring 43 is equal to or smaller than the diameter of the blocking ball 42.

[0071] In another specific implementation manner of this embodiment, the blocking ball 42 is a hemispherical structural member (not shown in the figure). One end of the spring 43 is connected to the threaded end of the first connecting plug 41, and the other end of the spring 43 (the end far from the first connecting plug 41) is connected to the flat end of the blocking ball 42 (the flat surface of the hemisphere).

[0072] Please refer to the attached Figure 3 and the attached Figure 9 , in a specific implementation manner of this embodiment, when the spring 43 abuts the blocking ball 42 against the first section of the water outlet pipe 21, the spring 43 is in a natural state (not compressed and not stretched).

[0073] Please refer to the attached Figure 3 and the attached Figure 7 , in a specific implementation manner of this embodiment, the first section of the water outlet pipe 21 includes: a first vertical section 25, a first horizontal section 26, a second horizontal section 27, and a second vertical section 28, which are sequentially connected and all have a cylindrical (or approximately cylindrical) passage structure;

[0074] One end of the first vertical section 25 is vertically connected and communicated with the first horizontal section 26, and the port at the other end of the first vertical section 25 is the water inlet 23;

[0075] The first horizontal section 26 is parallelly connected and communicated with the second horizontal section 27, and the passage diameter of the first horizontal section 26 is smaller than the passage diameter of the second horizontal section 27; the blocking ball 42 is arranged in the second horizontal section 27; the diameter of the blocking ball 42 is equal to the passage diameter of the second horizontal section 27, or the diameter of the blocking ball 42 is larger than the passage diameter of the first horizontal section 26 and smaller than the passage diameter of the second horizontal section 27; in the case where there is no water outlet from the valve body, the spring 43 abuts the blocking ball 42 against the connection between the first horizontal section 26 and the second horizontal section 27, causing the second horizontal section 27 to be not communicated with the first horizontal section 26 (cut off);

[0076] One end of the second horizontal section 27 away from the first horizontal section 26 is provided with the first connecting plug 41;

[0077] The second horizontal section 27 and the second vertical section 28 are vertically arranged and communicated.

[0078] It can be understood that when there is no water outlet in the valve body (the valve body is closed), the spring 43 abuts the blocking ball 42 against the connection between the first horizontal section 26 and the second horizontal section 27 to block the first horizontal section 26 and the second horizontal section 27, so as to cut off the water inlet 23 of the first section of the water outlet pipeline 21 from the water outlet 24 of the total water outlet pipeline; when there is water outlet in the valve body (the valve body is opened), the water flow acts on the blocking ball 42 to push the spring 43 to compress, and the first horizontal section 26 and the second horizontal section 27 are communicated, so as to connect the water inlet 23 of the first section of the water outlet pipeline 21 with the water outlet 24 of the total water outlet pipeline.

[0079] In a specific implementation manner of this embodiment, the extension lines of the axes of the first horizontal section 26, the second horizontal section 27, the first mounting port 22 and the first connecting plug 41 all coincide.

[0080] Please refer to the attached Figure 2 attachment Figure 3 attachment Figure 8 and the attached

[0081] One end of the second section of the water outlet pipeline 12 away from the first section of the water outlet pipeline 21 is provided with the water outlet 24 of the total water outlet pipeline;

[0082] The inverted bucket type steam trap further includes: a ring cylinder 5, and the ring cylinder 5 is arranged at the connection of the first section of the water outlet pipeline 21 and the second section of the water outlet pipeline 12.

[0083] In a specific implementation manner of this embodiment, the outer diameter of the ring cylinder 5 is equal to the pipe diameter of the first section of the water outlet pipeline 21 or the second section of the water outlet pipeline 12, and the ring cylinder 5 is installed in both the first section of the water outlet pipeline 21 and the second section of the water outlet pipeline 12 at the same time.

[0084] Please refer to the attached Figure 3 attachment Figure 7 attachment Figure 8, in another specific implementation manner of this embodiment, one end of the first outlet pipeline 21 (the second vertical section 28) close to the second outlet pipeline 12 is provided with a first installation groove 51, and the pipe diameter of the first installation groove 51 is larger than that of the second vertical section 28;

[0085] One end of the second outlet pipeline 12 close to the first outlet pipeline 21 is provided with a second installation groove 52, the pipe diameter of the second installation groove 52 is larger than that of the second outlet pipeline 21, and the pipe diameter of the second installation groove 52 is equal to that of the first installation groove 51;

[0086] The outer diameter of the annular cylinder 5 is larger than the pipe diameters of the first outlet pipeline 21 and the second outlet pipeline 12, and the outer diameter of the annular cylinder 5 is equal to the pipe diameters of the first outlet pipeline 21 and the second outlet pipeline 12;

[0087] The outer diameter of the annular cylinder 5 is equal to the pipe diameters of the first installation groove 51 and the second installation groove 52, and the annular cylinder 5 is installed in the first installation groove 51 and the second installation groove 52.

[0088] Please refer to Appendix Figure 2 、Appendix Figure 3 and Appendix Figure 8 , in a specific implementation manner of this embodiment, an inlet valve pipeline 13 is further provided in the valve body 1, and the inlet valve pipeline 13 communicates with the valve body cavity 11;

[0089] A cylindrical filter screen 14 is provided in the inlet valve pipeline 13, and at least part of the cylindrical filter screen 14 is attached to the inner wall of the inlet valve pipeline 13;

[0090] The water and / or steam enters the cylindrical filter screen 14 through the central hollow part of the cylindrical filter screen 14, and then flows into the valve body cavity 11 through the side wall of the cylindrical filter screen 14.

[0091] In the present utility model, by providing the cylindrical filter screen 14, the steam or low-temperature condensate water entering through the inlet valve pipeline is filtered to prevent foreign objects from entering the valve body 1, so as to avoid blocking the valve body or causing a potential threat to its service life.

[0092] Please refer to Appendix Figure 1 、Appendix Figure 3 and Appendix Figure 8 , in a specific implementation manner of this embodiment, the inlet valve pipeline 13 includes: a first pipe section 17 and a second pipe section 18, and the second pipe section 18 is smoothly and substantially perpendicularly connected to the first pipe section 17;

[0093] The first pipe section 17 is arranged substantially vertically, and an inlet valve port 131 is provided at one end of the first pipe section 17 away from the second pipe section 18;

[0094] One end of the second pipe section 18 away from the first pipe section 17 is inclined, and along this extending direction, the diameter of the second pipe section 18 gradually increases.

[0095] In a specific implementation manner of this embodiment, the cylindrical filter screen 14 is a cylindrical structural member with a constant diameter, and filter holes and / or filter meshes are provided on the side wall of the cylindrical filter screen 14.

[0096] In another specific implementation manner of this embodiment, the diameter of the cylindrical filter screen 14 is the same as the changing trend of the diameter of the second pipe section 18, that is: the cylindrical filter screen 14 is a frustum-shaped structural member, and filter holes and / or filter meshes are provided on the side wall thereof.

[0097] Please refer to Appendix Figure 1 to Appendix Figure 3 , and Appendix Figure 8 , in a specific implementation manner of this embodiment, the inlet valve port 131 and / or the water outlet 24 are provided with a threaded connection structure, and the (inverted bucket type steam trap with anti-backflow function) is connected to the external pipeline through the threaded connection structure (not shown in the figure).

[0098] Please refer to Appendix Figure 3 and Appendix Figure 8 , in a specific implementation manner of this embodiment, the valve body 1 connects the valve body cavity 11 and the inlet valve pipeline 13 through a vertically arranged communicating pipe section 19, and the communicating pipe section 19 is connected to one end of the second pipe section 18 away from the first pipe section 17; the communicating pipe section 19 connects the inlet valve pipeline 13 and the valve body cavity 11.

[0099] The open end (the end opposite to the closed end) of the inverted bucket 7 is buckled on the communicating pipe section 19.

[0100] Please refer to Appendix Figure 3 and Appendix Figure 8 , in a specific implementation manner of this embodiment, the inverted bucket type steam trap further includes: a second connecting plug 15, which is installed on the second installation port 29 of the valve body 1 through a connection method of internal and external threads matching, and one end of the second connecting plug 15 extending into the valve body 1 abuts against the cylindrical filter screen 14;

[0101] The horizontal height where the second connecting plug 15 is located is lower than the horizontal height where the first connecting plug 41 is located;

[0102] The second connecting plug 15 and the first connecting plug 41 are located on the same side of the valve body 1.

[0103] In the present utility model, by providing the second connecting plug 15, it is convenient to clean the impurities filtered by the cylindrical filter net 14, and it is also convenient to replace the cylindrical filter net 14.

[0104] In a specific implementation manner of this embodiment, the specifications (thickness, pore size, etc.) of the cylindrical filter net 14 can be replaced as required according to actual usage requirements and conditions.

[0105] In a specific implementation manner of this embodiment, a pore net (a smaller-level filter pore) is further provided in the filter pores on the side wall of the cylindrical filter net 14.

[0106] In a specific implementation manner of this embodiment, the second mounting port 29 is connected to one end of the second pipe section 18 away from the first pipe section 17. One end of the second connecting plug 15 is provided with an external thread structure, and the second mounting port 29 is provided with an internal thread structure that mates with the external thread structure.

[0107] Please refer to the appendix Figure 3 and the appendix Figure 8 , in a specific implementation manner of this embodiment, a convex portion 151 is provided at the threaded end of the second connecting plug 15, and one end of the cylindrical filter net 14 away from the first pipe section 17 is disposed (fixedly connected or abutted) on the convex portion 151.

[0108] In a specific implementation manner of this embodiment, the cylindrical filter net 14 is detachably connected to the threaded end of the second connecting plug 15 by screws.

[0109] Please refer to the appendix Figure 3 , the appendix Figure 7 , the appendix Figure 8 and the appendix Figure 13 , in a specific implementation manner of this embodiment, a kind of inverted bucket type steam trap with anti-counterflow function further includes: a connecting cylinder 6, and at least a part of the connecting cylinder 6 is sleeved in the water inlet 23 of the first section of the water outlet pipeline 21;

[0110] In the case of no water outlet (the valve body cavity 11 is cut off from the first section of the water outlet pipeline 21), the valve core 31 of the internal valve assembly 3 at least partially inserts into the central axis hole 61 of the connecting cylinder 6 to cut off the valve body cavity 11 from the first section of the water outlet pipeline 21.

[0111] In a specific implementation manner of this embodiment, the connecting cylinder 6 is a T-shaped structural member, including a cylinder body and a flange (valve seat) provided on the cylinder body. An internal thread structure is provided in the water inlet 23, and an external thread structure matching the internal thread structure is provided on a part of the cylinder body of the connecting cylinder 6 (extending into the water inlet 23). The connecting cylinder 6 is connected to the water inlet 23 by means of threaded connection.

[0112] In a specific implementation manner of this embodiment, the inner diameter of the connecting cylinder 6 is equal to the caliber (the pipe diameter of the first vertical section 25) of the water inlet 23.

[0113] In another specific implementation manner of this embodiment, the inner diameter of the connecting cylinder 6 is larger than the caliber (the pipe diameter of the first vertical section 25) of the water inlet 23.

[0114] Please refer to the attached Figure 3 、attached Figure 10 and attached Figure 11 , in a specific implementation manner of this embodiment, the part of the valve core 31 of the internal valve assembly 3 extending into the central shaft hole 61 is a frustum-shaped structure with a smooth top.

[0115] In the existing design, the part of the valve core 31 extending into the central shaft hole 61 is a hemispherical structure, which is prone to wear and deformation during use (moving relative to the connecting cylinder 6 multiple times), resulting in poor fit between the valve core and the central shaft hole (valve seat) of the connecting cylinder 6.

[0116] In the present utility model, by setting the frustum-shaped structure with a smooth top, a frustum-like structural design, when the valve core 31 is worn, the valve core 31 will move closer to the central shaft hole (valve seat) of the connecting cylinder 6, and the valve core 31 will be re-fitted tightly with the central shaft hole. Compared with the hemispherical structural design in the existing design, it can better resist wear and has a longer service life.

[0117] Please refer to the attached Figure 3 、attached Figure 10 to attached Figure 12 , in a specific implementation manner of this embodiment, the internal valve assembly 3 further includes:

[0118] A fixing piece 32, the main body of the fixing piece 32 is an L-shaped structural member; one end of the fixing piece 32 is provided with a first installation position 33, the other end of the fixing piece 32 is provided with a second installation position 34, and the first installation position 33 and the second installation position 34 are arranged perpendicular to each other; the first installation position 33 is connected to the valve body 1 or the valve cover 2;

[0119] The support piece 35, the mating end 36 of the support piece 35 is rotatably connected to the second mounting position 34, and the valve element 31 is arranged on the side of the support piece 35 facing the first mounting position 33; along the direction away from the mating end 36 and the fixing piece 32, the extension length of the support piece 35 is less than the extension length of the valve element 31.

[0120] Please refer to the appendix Figure 11 and the appendix Figure 12 In a specific implementation manner of this embodiment, the main body of the fixing piece 32 is an L-shaped structural member, and the L-shaped structural member includes a first plate and a second plate that are vertically connected. The first mounting position 33 is connected to the first plate, and the second mounting position 34 is arranged on the second plate, wherein the second mounting position 34 is vertically connected to the second plate, and (in the orthographic projection direction) the second mounting position 34 is perpendicular to both the first plate and the second plate.

[0121] In a specific implementation manner of this embodiment, both the first mounting position 33 and / or the second mounting position 34 are plates provided with connection holes; the first mounting position 33 is connected to the body 1 or the valve cover 2 by bolts; the second mounting position 34 is connected to the mating end 36 of the support piece 35 by a pin shaft, and the mating end 36 is rotatably connected to the second mounting position 34 with the pin shaft as the axis.

[0122] Please refer to the appendix Figure 12 In a specific implementation manner of this embodiment, there are two second mounting positions 34, and the two second mounting positions 34 are arranged on both sides of the second plate of the L-shaped structural member;

[0123] The mating end 36 is arranged on the side of the support piece 35 away from the first plate (away from the first mounting position 33), and there are also two corresponding mating ends 36;

[0124] The pin shaft passes through the holes of the two mating ends 36 and the connection holes of the two second mounting positions 34, and rotatably connects the support piece 35 to the fixing piece 32.

[0125] Please refer to the appendix Figure 10 and the appendix Figure 11 In a specific implementation manner of this embodiment, a hook hole 37 is arranged at one end of the valve element 31 away from the mating end 36;

[0126] The hook hole 37 is arranged on the side of the valve element 31 away from the second mounting position 34 (away from the mating end 36).

[0127] Please refer to the appendix Figure 3 to the appendix Figure 5, in a specific implementation manner of this embodiment, the inverted bucket type steam trap further includes: an inverted bucket 7, one end of the inverted bucket 7 close to the valve cover 2 is closed to form a closed end, and an air hole 71 is provided on the closed end.

[0128] Please refer to the appendix Figure 4 and the appendix Figure 5 , and the appendix Figure 10 and the appendix Figure 11 , in a specific implementation manner of this embodiment, a hook - holding linkage component 8 is further provided at the middle position of the closed end of the inverted bucket 7, and one end of the hook - holding linkage component 8 away from the inverted bucket 7 is hooked in the hook - holding hole 37; the inverted bucket 7 moves up and down according to the change of water vapor in the valve body cavity 11, drives the inner valve assembly 3 to rotate around the rotation center (pin shaft) of the support piece 35 and the fixed piece 32, and moves the valve core 31 towards or away from the connecting cylinder 6, thereby realizing the control of the conduction or cut - off between the valve body cavity 11 of the valve body 1 and the first - stage water outlet pipeline 21.

[0129] Please refer to the appendix Figure 1 to the appendix Figure 3 , in a specific implementation manner of this embodiment, a sealing gasket 16 is provided between the valve body 1 and the valve cover 2.

[0130] In the present utility model, by providing the sealing gasket 16, the valve body 1 and the valve cover 2 are tightly combined, avoiding the problems of water leakage and air leakage.

[0131] The working principle of a bucket - type steam trap with a back - flow prevention function provided by this application is specifically as follows:

[0132] When the inverted bucket type steam trap is in the early stage of startup (just starting), the inverted bucket 7 is in a low position (relatively low position) by its own weight. The hook - holding linkage component 8 provided on the inverted bucket 7 drives the inner valve assembly 3 away from the water inlet 23, and the valve is in an open state (the valve body cavity 11 is communicated with the first - stage water outlet pipeline 21); air and low - temperature condensate water in the external pipeline (the external pipeline connected to the inlet valve port 131) enter the inverted bucket type steam trap, pass through the connecting pipe section 19 and enter the valve body cavity 11, and then are discharged through the total water outlet pipeline (during this period, the back - flow prevention structure 4 is pushed, the spring 43 is compressed, and the first - stage water outlet pipeline 21 is communicated with the second - stage water outlet pipeline 12);

[0133] When steam enters the inverted bucket 7 through the inlet valve port 131 and accumulates for a period of time, due to the water seal formed thereby (outside the inverted bucket 7 in the valve body cavity 11), sufficient steam is injected into the inverted bucket 7. An upward buoyancy force is generated by the steam, and the inverted bucket 7 rises (being in a higher position or moving from a lower position to a higher position). The hooking linkage member 8 drives the inner valve assembly 3 closer to the water inlet 23 to close the valve (the valve body cavity 11 is cut off from the first-stage water outlet pipe 21). (During this period, the anti-backflow structure 4 is reset, the spring 43 naturally extends and resets, and the first-stage water outlet pipe 21 is cut off from the second-stage water outlet pipe 12);

[0134] Since the air hole 71 is provided on the inverted bucket 7, a part of the steam is discharged from the inverted bucket 7 through the air hole 71, and another part of the steam generates condensate water. The buoyancy force received by the inverted bucket 7 is reduced, and it sinks by its own weight (moving from a higher position to a lower position). The hooking linkage member 8 provided on the inverted bucket 7 drives the inner valve assembly 3 away from the water inlet 23 to open the valve (the valve body cavity 11 is communicated with the first-stage water outlet pipe 21);

[0135] The cycle is carried out to achieve intermittent drainage.

[0136] By applying the inverted bucket type steam trap with an anti-backflow function provided in the present application, by setting the anti-backflow structure, the total water outlet pipe is cut off when there is no water flow in the inverted bucket type steam trap, which not only avoids the occurrence of the problem that external gas / liquid flows back and affects the water seal and pressure difference stability in the valve body cavity 11, but also avoids the problem of steam overflow, ensuring the safe use of the equipment.

[0137] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the technical solution scope of the present invention, can make some changes or modifications to the above-mentioned technical content as equivalent changed equivalent embodiments by using the above-mentioned disclosed technical content. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the scope of the present invention.

Claims

1. An inverted bucket steam trap with a backflow prevention function, comprising a valve body (1) and a valve cover (2) disposed on the valve body (1), wherein the valve body cavity (11) of the valve body (1) and the first section of the water outlet pipeline (21) of the valve cover (2) are controlled to be connected or cut off through an internal valve assembly (3), characterized in that: The first section of the water outlet pipeline (21) is provided with a backflow prevention structure (4); The anti-backflow structure (4) comprises: A first connecting screw plug (41), the first connecting screw plug (41) being installed on the first installation opening (22) of the valve cover (2) by means of a connection method in which internal and external threads cooperate; a blocking ball (42), the blocking ball (42) being arranged in the first section of the water outlet pipeline (21) on one side close to the water inlet (23) of the first section of the water outlet pipeline (21); a spring (43), one end of the spring (43) being connected to the threaded end of the first connecting screw plug (41), and the other end of the spring (43) being connected to the blocking ball (42); Wherein, when the valve body cavity (11) and the first section of the water outlet pipeline (21) are cut off, the spring (43) supports the blocking ball (42) and presses the blocking ball (42) against the first section of the water outlet pipeline (21) to cut off the water inlet (23) of the first section of the water outlet pipeline (21) and the water outlet (24) of the main water outlet pipeline; when the valve body cavity (11) and the first section of the water outlet pipeline (21) are connected, the water flow pushes the blocking ball (42) and the spring (43) to move in a direction close to the first connecting screw (41) to connect the water inlet (23) of the first section of the water outlet pipeline (21) with the water outlet (24) of the main water outlet pipeline.

2. The inverted bucket steam trap with anti-backflow function according to claim 1, characterized in that: The first section of the water outlet pipeline (21) comprises: a first vertical section (25), a first horizontal section (26), a second horizontal section (27) and a second vertical section (28) which are sequentially connected and all have cylindrical passage structures; One end of the first vertical section (25) is vertically connected to the first horizontal section (26), and the port at the other end of the first vertical section (25) is the water inlet (23); The first horizontal section (26) and the second horizontal section (27) are arranged in parallel and communicated with each other; the passage diameter of the first horizontal section (26) is smaller than the passage diameter of the second horizontal section (27); the blocking ball (42) is arranged in the second horizontal section (27); the diameter of the blocking ball (42) is equal to the passage diameter of the second horizontal section (27), or the diameter of the blocking ball (42) is larger than the passage diameter of the first horizontal section (26) and smaller than the passage diameter of the second horizontal section (27); when the valve body cavity (11) and the first section of the water outlet pipeline (21) are cut off, the spring (43) presses the blocking ball (42) against the connection between the first horizontal section (26) and the second horizontal section (27); The first connecting screw plug (41) is disposed at one end of the second horizontal section (27) away from the first horizontal section (26); The second horizontal section (27) is vertically connected to the second vertical section (28).

3. The inverted bucket steam trap with anti-backflow function according to claim 2, characterized in that: The valve body (1) is also provided with a second section of water outlet pipeline (12), the second section of water outlet pipeline (12) is correspondingly connected to the first section of water outlet pipeline (21), and the first section of water outlet pipeline (21) and the second section of water outlet pipeline (12) constitute the total water outlet pipeline; An end of the second water outlet pipeline (12) away from the first water outlet pipeline (21) is provided with a water outlet (24) of the main water outlet pipeline; The inverted bucket steam trap further comprises: an annular cylinder (5), wherein the annular cylinder (5) is arranged at the connection between the first section of the water outlet pipeline (21) and the second section of the water outlet pipeline (12).

4. The inverted bucket steam trap with anti-backflow function according to claim 1, characterized in that: A valve inlet pipeline (13) is also provided in the valve body (1), and the valve inlet pipeline (13) is communicated with the valve body cavity (11); A cylindrical filter screen (14) is arranged in the inlet valve pipeline (13), and the cylindrical filter screen (14) is at least partially attached to the inner wall of the inlet valve pipeline (13); The inlet water and / or inlet steam flows into the cylindrical filter screen (14) through the hollow center of the cylindrical filter screen (14), and then flows into the valve body cavity (11) through the side wall of the cylindrical filter screen (14).

5. The inverted bucket steam trap with anti-backflow function according to claim 4, characterized in that: Also includes: A second connecting screw plug (15), the second connecting screw plug (15) being installed on the second installation opening (29) of the valve body (1) by means of a connection method in which internal and external threads cooperate, and one end of the second connecting screw plug (15) extending into the valve body (1) abuts against the cylindrical filter screen (14); The level at which the second connecting screw plug (15) is located is lower than the level at which the first connecting screw plug (41) is located; The second connecting screw plug (15) and the first connecting screw plug (41) are located on the same side of the valve body (1).

6. The inverted bucket steam trap with anti-backflow function according to claim 1, characterized in that: Also includes: A connecting tube (6), wherein at least a portion of the connecting tube (6) is sleeved in the water inlet (23) of the first section of the water outlet pipeline (21); When the valve body cavity (11) and the first section of the water outlet pipeline (21) are cut off, the valve core (31) of the inner valve assembly (3) is at least partially inserted into the central axis hole (61) of the connecting tube (6).

7. The inverted bucket steam trap with anti-backflow function according to claim 6, characterized in that: The portion of the valve core (31) of the inner valve assembly (3) that extends into the central axis hole (61) is a truncated cone-shaped structure with a smooth top.

8. The inverted bucket steam trap with anti-backflow function according to claim 6, characterized in that: The inner valve assembly (3) further comprises: A fixing plate (32), wherein the main body of the fixing plate (32) is an L-shaped structural member; a first mounting position (33) is provided at one end of the fixing plate (32), and a second mounting position (34) is provided at the other end of the fixing plate (32), wherein the first mounting position (33) and the second mounting position (34) are relatively vertically arranged; and the first mounting position (33) is connected to the valve body (1) or the valve cover (2); A support plate (35), wherein the mating end (36) of the support plate (35) is rotatably connected to the second mounting position (34), and the valve core (31) is arranged on the side of the support plate (35) facing toward the first mounting position (33); along the direction away from the mating end (36) and the fixing plate (32), the extension length of the support plate (35) is less than the extension length of the valve core (31).

9. The inverted bucket steam trap with backflow prevention function according to claim 8, characterized in that: A hook hole (37) is provided at one end of the valve core (31) away from the matching end (36); The inverted bucket steam trap further comprises: an inverted bucket (7), wherein the inverted bucket (7) is arranged in the valve body cavity (11); one end of the inverted bucket (7) close to the valve cover (2) is closed to form a closed end, and an air hole (71) is arranged on the closed end; A hooking linkage component (8) is also provided on the closed end, and the hooking linkage component (8) is hooked in the hooking hole (37); the inverted bucket (7) moves up and down according to the change of water vapor in the valve body cavity (11), driving the inner valve assembly (3) to rotate around the rotation center of the support plate (35) and the fixing plate (32), thereby realizing the control of the conduction or cutoff of the valve body cavity (11) of the valve body (1) and the first section of the water outlet pipeline (21) of the valve cover (2).

10. An inverted bucket steam trap with backflow prevention function according to any one of claims 1 to 9, characterized in that: A sealing gasket (16) is provided between the valve body (1) and the valve cover (2).

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