Shear valve adopting tubular spring sealing structure

Abstract

The utility model provides a shear valve adopting a tubular spring sealing structure, and relates to the technical field of shear valves. The shear valve adopting the tubular spring sealing structure comprises a valve body, a gate plate is arranged in the valve body, a valve rod is arranged at the upper end of the gate plate, two mounting grooves are formed in the valve body, valve seats are mounted in the two mounting grooves, annular grooves are formed in the inner walls of the two mounting grooves, and the valve rod is arranged in the annular grooves. Two annular grooves are formed in the valve seat, two sealing rings are slidably connected into each annular groove, the multiple sealing rings are fixedly connected with the valve seat, first pipe springs are arranged in the two annular grooves, the two first pipe springs are located between the two corresponding sealing rings, and two first graphite rings are arranged in each annular groove. The shear valve adopting the tubular spring sealing structure has high-temperature corrosion resistance, oxidation resistance and good mechanical performance, can adapt to the working condition of a high-temperature and high-hardness medium, prolongs the service life of the valve, and improves the sealing effect and reliability of the shear valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shear valve technical field especially relates to a shear valve with tubular spring sealing structure. BACKGROUND

[0002] In the industrial pipeline system, for some special working condition pipeline, such as the pipeline of conveying hard material and high temperature medium, and the working scene that the valve needs to be frequently opened, the performance and service life of the valve face severe challenges.

[0003] At present, there is a lack of valve for this kind of special working condition in the market. The general valve has a short service life under this special working condition, and the main reason is that the medium of the pipeline may flow into the valve body during the opening and closing of the valve, and the high temperature and high hardness medium is easy to cause certain damage to the inner cavity parts of the valve. For example, in a high temperature environment, ordinary valve parts are easy to be corroded or deformed, and the scouring of high hardness medium can aggravate the wear of the parts, thereby affecting the normal use of the valve and greatly shortening the service life of the valve.

[0004] The spring structure used in the traditional valve is mainly a uniformly distributed cylindrical spiral compression spring. This spring structure has many drawbacks under special working conditions. On the one hand, its high temperature fatigue resistance is poor, and it is easy to be damaged by fatigue in a high temperature environment; on the other hand, it has insufficient wear resistance and corrosion resistance, and is difficult to resist the erosion of special medium. In addition, the traditional spring structure is not balanced when compressed, and is easy to be blocked and stuck, thereby affecting the sealing performance and overall working reliability of the valve.

[0005] Therefore, it is necessary to provide a shear valve with a tubular spring sealing structure to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0006] To solve the above technical problems, the utility model provides a shear valve with a tubular spring sealing structure.

[0007] The shear valve with a tubular spring sealing structure provided by the utility model comprises a valve body, a gate plate arranged in the valve body, a valve rod arranged at the upper end of the gate plate, two installation grooves arranged in the valve body, a valve seat arranged in each of the two installation grooves, an annular groove arranged on the inner wall of each of the two installation grooves, two sealing rings slidably connected in each of the two annular grooves, a plurality of sealing rings fixedly connected with the valve seat, a tubular spring one arranged in each of the two annular grooves, the tubular spring one arranged between the corresponding two sealing rings, and two first graphite rings arranged in each of the two annular grooves and located on the side of the corresponding sealing ring away from the tubular spring one.

[0008] Preferably, the inner wall of the valve seat is provided with an embedded groove, and the embedded groove is provided with a second graphite ring, and the inner wall of the second graphite ring is in interference fit with the gate plate.

[0009] Preferably, the outer wall of the valve seat is provided with a connecting groove, and the connecting groove is provided with a second tube spring, and the outer sides of the two second tube springs are in contact with the valve body.

[0010] Preferably, the first tube spring and the second tube spring are made of Inconel600 high-temperature alloy.

[0011] Preferably, the first tube spring and the second tube spring are both whole-circle springs.

[0012] Preferably, the first graphite ring and the second graphite ring are both high-purity expanded graphite rings.

[0013] Preferably, the valve body is made of high-temperature alloy material, the sealing surface of the valve seat is built up with nickel-based alloy, and the sealing surface of the gate plate is built up with hard alloy.

[0014] Compared with the related art, the shear valve with the tube spring sealing structure has the following beneficial effects:

[0015] 1. The shear valve with the tube spring sealing structure adopts the tube spring made of Inconel600 high-temperature alloy, the alloy has excellent high-temperature corrosion resistance and oxidation resistance, can effectively resist the erosion of high-temperature and high-hardness medium to the internal parts of the valve, greatly improves the corrosion resistance of the valve under special working conditions, and prolongs the service life of the valve.

[0016] 2. The shear valve with the tube spring sealing structure adopts the whole-circle spring structure, compared with the traditional uniformly-distributed cylindrical helical compression spring, the compression stress is more balanced, and is always in an effective state, and the spring is not prone to blockage and failure, thereby ensuring the reliability and stability of the spring during frequent opening and closing of the valve, and further ensuring that the valve can work normally and stably, and improving the overall working performance of the valve.

[0017] 3. The shear valve with the tube spring sealing structure pushes the sealing ring through the tube spring, and further pushes the valve seat to slightly displace in the direction of the gate plate, and the second tube spring is always in a pre-tightening state, so as to make the valve seat and the gate plate closely fit, the unique sealing structure design can automatically adjust the sealing state according to the change of medium pressure, further improves the sealing performance of the valve, and meets the sealing requirements under different working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1A preferred embodiment structure schematic view of the shear valve with the tubular spring sealing structure is provided.

[0019] The figure mark: 1, valve body;2, valve seat;3, first graphite ring;4, sealing ring;5, tubular spring one;6, gate;7, tubular spring two;8, second graphite ring;9, valve rod. Specific embodiments

[0020] The utility model is further described below in combination with the drawings and embodiments.

[0021] Please see Figure 1 A shear valve with the tubular spring sealing structure includes: valve body 1, the valve body 1 is equipped with the gate 6, the upper end of gate 6 is equipped with valve rod 9, the valve body 1 is equipped with two installation grooves, two installation grooves are all equipped with valve seat 2, the inner wall of two installation grooves is all equipped with annular groove, two annular grooves are all slidably connected with two sealing rings 4, multiple sealing rings 4 are all fixedly connected with valve seat 2, two annular grooves are all equipped with tubular spring one 5, two tubular spring one 5 are located between corresponding two sealing rings 4, two annular grooves are all equipped with two first graphite rings 3, and each first graphite ring 3 is located at the side, away from tubular spring one 5, of the corresponding sealing ring 4, the inner wall of valve seat 2 is equipped with embedding groove, the embedding groove is equipped with second graphite ring 8, and the inner wall of second graphite ring 8 is in interference fit with gate 6, the outer wall of valve seat 2 is equipped with connecting groove, the connecting groove is equipped with tubular spring two 7, and the outer side of two tubular spring two 7 is in contact with valve body 1.

[0022] Among them, tubular spring one 5 and tubular spring two 7 are made of Inconel600 high-temperature alloy, tubular spring one 5 and tubular spring two 7 are all whole circle springs, first graphite ring 3 and second graphite ring 8 are all high-purity expanded graphite rings, valve body 1 is made of high-temperature alloy material, the sealing surface of valve seat 2 is hardfaced with nickel-based alloy, and the sealing surface of gate 6 is hardfaced with hard alloy.

[0023] It should be noted that: Inconel600 high-temperature alloy is a nickel-chromium-iron-based solid solution strengthening alloy, which has excellent high-temperature corrosion resistance and oxidation resistance, excellent cold and hot working and welding performance, satisfactory thermal strength and high plasticity below 700 DEG C, the alloy can be strengthened by cold working, and can be connected by resistance welding, fusion welding or brazing, suitable for making oxidation-resistant parts below 1100 DEG C under low load, the whole circle spring has the characteristics of high-temperature fatigue resistance, wear resistance, corrosion resistance and balanced compression stress, and the spring is always in an effective state, and is not prone to spring jamming and failure.

[0024] The working principle of the shear valve with a tubular spring sealing structure provided by this utility model is as follows: During the valve opening process, the valve stem 9 drives the gate 6 to descend. At this time, the medium pressure in the pipeline flows from left to right within the valve body 1. The medium pressure acts on the gap between the valve body 1 and the valve seat 2, causing the valve seat 2 to press against the gate 6 under the medium pressure. Simultaneously, the tubular spring 5 pushes the sealing ring 4, further pushing the valve seat 2 to make a slight displacement towards the gate 6, ensuring that the sealing surfaces between the valve seat 2 and the gate 6 can better fit together.

[0025] The second spring 7 is always in a pre-tightened state. It continuously applies pressure to make the valve seat 2 and the gate 6 fit tightly together, enhance the sealing effect, and prevent the medium from leaking from the seal between the valve seat 2 and the gate 6 during the valve opening process.

[0026] During valve closure, the valve stem 9 is operated to lift the gate upwards. As the gate 6 rises, the sealing surface between the valve seat 2 and the gate 6 gradually separates. During this process, the second graphite ring 8 embedded in the valve seat 2 plays a role. On the one hand, the presence of the second graphite ring 8 maintains a full combination of soft and hard seals between the gate 6 and the valve seat 2, preventing media leakage to a certain extent even when the gate 6 rises and detaches from the valve seat. On the other hand, the second graphite ring 8 can scrape away impurities attached to the gate 6, preventing impurities from causing wear on the sealing surface or affecting the sealing effect when the valve is closed next time.

[0027] Throughout the valve's opening and closing process, the tube springs 5 ​​and 7, made of Inconel 600 high-temperature alloy, possess excellent resistance to high-temperature corrosion and oxidation, as well as good mechanical properties. This ensures stable operation of the springs under special conditions such as high-temperature and high-hardness media, continuously providing reliable pressure support for the sealing of valve seat 2 and gate 6, thus ensuring the valve's sealing performance and overall operational reliability. Simultaneously, the valve body 1 is made of high-temperature alloy material, and the sealing surfaces of valve seat 2 and gate 6 are respectively overlaid with nickel-based alloy and hard alloy. These material properties also enable the various components of the valve to better adapt to special operating conditions and withstand the erosion and corrosion of the media, thereby ensuring the normal operation and long service life of the valve.

[0028] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A shear valve employing a tubular spring sealing structure, characterized in that, include: A valve body (1) is provided inside the valve body (1). A gate plate (6) is provided at the upper end of the gate plate (6). A valve stem (9) is provided inside the valve body (1). Two mounting grooves are provided inside the valve body (1). A valve seat (2) is installed in each of the two mounting grooves. An annular groove is provided on the inner wall of each of the two mounting grooves. Two sealing rings (4) are slidably connected in each of the two annular grooves. Multiple sealing rings (4) are fixedly connected to the valve seat (2). A tube spring (5) is provided in each of the two annular grooves. The two tube springs (5) are located between the corresponding two sealing rings (4). Two first graphite rings (3) are provided in each of the two annular grooves. Each first graphite ring (3) is located on the side of the corresponding sealing ring (4) away from the tube spring (5).

2. A shear valve employing a tubular spring sealing structure according to claim 1, characterized in that, The valve seat (2) has an embedded groove on its inner wall, and a second graphite ring (8) is provided in the embedded groove. The inner wall of the second graphite ring (8) is interference-fitted with the gate (6).

3. A shear valve employing a tubular spring sealing structure according to claim 1, characterized in that, The outer wall of the valve seat (2) is provided with a connecting groove, and a second tube spring (7) is provided in the connecting groove. The outer sides of the two second tube springs (7) are in contact with the valve body (1).

4. A shear valve employing a tubular spring sealing structure according to claim 3, characterized in that, The tube spring one (5) and tube spring two (7) are made of Inconel 600 high-temperature alloy.

5. A shear valve employing a tubular spring sealing structure according to claim 3, characterized in that, Both tube spring one (5) and tube spring two (7) are full-turn springs.

6. A shear valve employing a tubular spring sealing structure according to claim 2, characterized in that, Both the first graphite ring (3) and the second graphite ring (8) are high-purity expanded graphite rings.

7. A shear valve employing a tubular spring sealing structure according to claim 1, characterized in that, The valve body (1) is made of high-temperature resistant alloy material, the sealing surface of the valve seat (2) is overlaid with nickel-based alloy, and the sealing surface of the gate (6) is overlaid with hard alloy.

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