Low-temperature stop valve suitable for natural gas transportation

Abstract

The low-temperature stop valve suitable for natural gas transportation comprises a valve body and a heating mechanism installed on the outer side of the valve body, the heating mechanism comprises two heating boxes symmetrically installed in the middle of the outer side of the valve body, the two heating boxes are fixed through bolts, partition plates are vertically installed in the heating boxes, and the partition plates are fixed through bolts. The interior of the heating mechanism is divided into two heating cavities by the partition plate, a draught fan is installed on the surface of the partition plate, electric heating wires are installed in the heating cavities and located on the two sides of the draught fan respectively, and a buffering mechanism is arranged below the heating mechanism. The heating mechanism is installed on the outer side of the valve body, air in the heating mechanism is heated through the electric heating wire, the draught fan is started in the heating process and drives the internal air to circulate, the valve body and the tail end of the valve rod are heated in the circulation process of the air, freezing between the valve body and the valve rod is avoided, and the service life of the valve rod is prolonged. And meanwhile, the cold brittleness phenomenon of the valve body in a long-time low-temperature environment can be avoided, and the service life of the valve body is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a low-temperature stop valve suitable for natural gas transportation. Background Art

[0002] Cryogenic stop valve is a valve mainly used for control and regulation of cryogenic liquids such as liquid oxygen, liquid nitrogen, liquid argon, liquid hydrogen and natural gas. It has been widely used in aerospace, scientific research, medical, electronics and other fields. Compared with ordinary stop valves, it has higher requirements in material selection, sealing structure and cold resistance. The materials are usually made of specially treated high-quality stainless steel, copper alloy, aluminum alloy, titanium alloy and graphite, so that the cryogenic stop valve can maintain high strength, high toughness and high corrosion resistance even in extremely low temperature environment.

[0003] When the existing cryogenic stop valve for natural gas transportation is used in a low-temperature environment, water vapor in the air solidifies between the valve stem and the valve body, causing the valve stem to be unable to rotate, affecting the normal use of the stop valve; after long-term use, the valve stem may become cold and brittle due to the relatively low temperature environment, and the cold and brittle phenomenon will also make the metal more susceptible to corrosion, thereby affecting the service life of the ultra-low temperature stop valve. Therefore, a cryogenic stop valve suitable for natural gas transportation is proposed. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a low-temperature stop valve suitable for natural gas transportation, which solves the following problems: when the existing low-temperature stop valve for natural gas transportation is used in a low-temperature environment, water vapor in the air solidifies between the valve stem and the valve body, causing the valve stem to be unable to rotate, affecting the normal use of the stop valve; after long-term use, the valve stem may become cold and brittle due to the relatively low temperature environment, and the cold and brittle phenomenon may also make the metal more susceptible to corrosion, thereby affecting the service life of the ultra-low temperature stop valve and affecting the normal use of the stop valve.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a low-temperature stop valve suitable for natural gas transportation, comprising a valve body and a heating mechanism installed on the outside of the valve body, the heating mechanism comprising two heating boxes symmetrically installed in the middle of the outside of the valve body, the two heating boxes are fixed with bolts, a partition is vertically installed inside the heating box, the partition divides the inside of the heating mechanism into two heating chambers, a fan is installed on the surface of the partition, and electric heating wires are installed inside the heating chamber and on both sides of the fan, and a buffer mechanism is arranged below the heating mechanism.

[0008] As a further preferred embodiment of the present invention, the buffer mechanism includes a base and a support rod vertically installed at a top corner of the base, and a movable groove for use with the support rod is provided at the bottom corner of the buffer mechanism.

[0009] As a further preferred embodiment of the utility model, the upper end of the support rod extends into the movable groove and is movably connected to the movable groove, a shock-absorbing sleeve is installed on the upper end of the support rod, the shock-absorbing sleeve is made of rubber material and is fitly connected to the inner wall of the movable groove, and a shock-absorbing pad is arranged above the support rod.

[0010] As a further preferred embodiment of the utility model, springs are respectively provided on both sides of the shock-absorbing pad and the ends of the springs at the bottom are connected to the upper end of the support rod, a central cavity is provided in the middle of the shock-absorbing pad and the central cavity has an elliptical structure, and side cavities are respectively provided inside the shock-absorbing pad and on both sides of the central cavity.

[0011] As a further preferred embodiment of the present invention, a valve stem is vertically arranged in the middle of the top surface of the valve body, and the upper end of the valve stem extends to above the heating mechanism and is sleeved with a sleeve.

[0012] As a further preferred embodiment of the present invention, screw holes are provided on the surfaces of the sleeve and the valve stem, handles are symmetrically provided on the surface of the sleeve, and a threaded structure is provided on the surface of the handle and connected to the screw hole via the threaded structure.

[0013] (III) Beneficial effects

[0014] The utility model provides a low-temperature stop valve suitable for natural gas transportation, which has the following beneficial effects:

[0015] The utility model installs a heating mechanism on the outside of the valve body, and heats the air inside the heating mechanism through an electric heating wire. During the heating process, the fan starts and drives the internal air to circulate. During the circulation of the air, the valve body and the end of the valve stem are heated to avoid freezing between the valve body and the valve stem. At the same time, it can also prevent the valve body from becoming cold and brittle in a long-term low temperature environment, thereby increasing the service life of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an external structural diagram of the cryogenic stop valve suitable for natural gas transportation according to the utility model;

[0017] Figure 2 This is the internal structure diagram of the cryogenic stop valve suitable for natural gas transportation according to the utility model;

[0018] Figure 3 for Figure 2 A is an enlarged view of the middle image.

[0019] In the figure: 1. base; 2. heating box; 3. valve body; 4. valve stem; 5. sleeve; 6. threaded structure; 7. handle; 8. support rod; 9. partition; 10. heating wire; 11. movable groove; 12. heating chamber; 13. fan; 14. shock-absorbing pad; 15. side chamber; 16. middle chamber; 17. shock-absorbing sleeve; 18. spring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3 The embodiment of the utility model provides a technical solution: a low-temperature stop valve suitable for natural gas transportation, including a valve body 3 and a heating mechanism installed on the outside of the valve body 3, the heating mechanism including two heating boxes 2 symmetrically installed in the middle of the outside of the valve body 3, the two heating boxes 2 are fixed with bolts, a partition 9 is vertically installed inside the heating box 2, the partition 9 divides the inside of the heating mechanism into two heating chambers 12, a fan 13 is installed on the surface of the partition 9, and electric heating wires 10 are installed inside the heating chamber 12 and on both sides of the fan 13, respectively. The electric heating wires 10 heat the air in the heating chamber 12 and circulate it through the fan 13, which has a heating effect on the valve body 3 and the valve stem 4, and a buffer mechanism is arranged below the heating mechanism, which has a buffer effect and reduces the influence of pipeline vibration on the valve body 3.

[0022] In a further improvement, the buffer mechanism comprises a base 1 and a support rod 8 vertically mounted at the top corner of the base 1, and a movable groove 11 for use with the support rod 8 is provided at the bottom corner of the buffer mechanism. The upper end of the support rod 8 extends into the movable groove 11 and is movably connected to the movable groove 11, and a shock-absorbing sleeve 17 is installed at the upper end of the support rod 8, and the shock-absorbing sleeve 17 is made of rubber material and is closely connected to the inner wall of the movable groove 11, and a shock-absorbing pad 14 is arranged above the support rod 8. Springs 18 are respectively arranged on both sides of the shock-absorbing pad 14, and the end of the spring 18 located at the bottom is connected to the upper end of the support rod 8, and a middle cavity 16 is arranged in the middle of the shock-absorbing pad 14, and the middle cavity 16 is an elliptical structure, and side cavities 15 are respectively provided inside the shock-absorbing pad 14 and on both sides of the middle cavity 16, and the shock-absorbing pad 14 cooperates with the shock-absorbing sleeve 17 and the spring 18 to achieve a shock-absorbing effect.

[0023] In a further improvement, a valve stem 4 is vertically arranged in the middle of the top surface of the valve body 3, and the upper end of the valve stem 4 extends to the top of the heating mechanism and is sleeved with a sleeve 5. The surfaces of the sleeve 5 and the valve stem 4 are both provided with screw holes, and the surface of the sleeve 5 is symmetrically provided with a handle 7, and the surface of the handle 7 is provided with a threaded structure 6 and connected to the screw hole through the threaded structure 6. After the handle 7 is turned, it is connected to the screw hole on the surface of the valve stem 4. After use, the handle 7 and the sleeve 5 can be disassembled.

[0024] Working principle: The heating mechanism is installed on the outside of the valve body 3. When the valve body 3 needs to be heated, the heating wire 10 is turned on to heat the air inside the heating mechanism. During the heating process, the fan 13 is started and drives the internal air to circulate. During the circulation process, the air heats the valve body 3 and the end of the valve stem 4 to avoid freezing between the valve body 3 and the valve stem 4. At the same time, it can also prevent the valve body 3 from becoming cold and brittle in a low temperature environment for a long time, thereby increasing the service life of the valve body 3. The support rod 8 supports and buffers the heating box 2, and cooperates with the spring 18, the shock-absorbing sleeve 17 and the shock-absorbing pad 14 to achieve a shock-absorbing effect.

[0025] The utility model includes 1, base; 2, heating box; 3, valve body; 4, valve stem; 5, sleeve; 6, threaded structure; 7, handle; 8, support rod; 9, partition; 10, heating wire; 11, movable groove; 12, heating chamber; 13, fan; 14, shock-absorbing pad; 15, side chamber; 16, middle chamber; 17, shock-absorbing sleeve; 18, spring. All the components are universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods. The utility model solves the problem that when the existing low-temperature stop valve for natural gas transportation is used in a low-temperature environment, water vapor in the air solidifies between the valve stem 4 and the valve body 3, causing the valve stem 4 to be unable to rotate. The problem of movement affects the normal use of the stop valve; after long-term use, the valve stem 4 may become cold and brittle due to the relatively low temperature environment, and the cold and brittle phenomenon will also make the metal more susceptible to corrosion, thus affecting the service life of the ultra-low temperature stop valve. The utility model combines the above-mentioned components with each other. The utility model installs a heating mechanism on the outside of the valve body 3, and heats the air inside the heating mechanism through the electric heating wire 10. During the heating process, the fan 13 is started and drives the internal air to circulate. During the circulation process, the air heats the valve body 3 and the end of the valve stem 4 to avoid freezing between the valve body 3 and the valve stem 4. At the same time, it can also avoid the valve body 3 from forming a cold and brittle phenomenon in a long-term low temperature environment, thereby increasing the service life of the valve body 3.

[0026] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0027] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cryogenic stop valve suitable for natural gas transportation, comprising a valve body (3) and a heating mechanism installed outside the valve body (3), characterized in that: The heating mechanism comprises two heating boxes (2) symmetrically mounted in the middle of the outer side of the valve body (3), the two heating boxes (2) being fixed by bolts, a partition (9) being vertically mounted inside the heating box (2), the partition (9) dividing the interior of the heating mechanism into two heating chambers (12), a fan (13) being mounted on the surface of the partition (9), electric heating wires (10) being mounted inside the heating chamber (12) and on both sides of the fan (13), and a buffer mechanism being arranged below the heating mechanism.

2. A cryogenic stop valve suitable for natural gas transportation according to claim 1, characterized in that: The buffer mechanism comprises a base (1) and a support rod (8) vertically mounted at a top corner of the base (1); a movable groove (11) for use with the support rod (8) is provided at a bottom corner of the buffer mechanism.

3. A cryogenic stop valve suitable for natural gas transportation according to claim 2, characterized in that: The upper end of the support rod (8) extends into the movable groove (11) and is movably connected to the movable groove (11). A shock-absorbing sleeve (17) is installed on the upper end of the support rod (8). The shock-absorbing sleeve (17) is made of rubber material and is closely connected to the inner wall of the movable groove (11). A shock-absorbing pad (14) is arranged above the support rod (8).

4. A cryogenic stop valve suitable for natural gas transportation according to claim 3, characterized in that: Springs (18) are respectively arranged on both sides of the shock absorbing pad (14), and the end of the spring (18) located at the bottom is connected to the upper end of the support rod (8); a central cavity (16) is arranged in the middle of the shock absorbing pad (14), and the central cavity (16) is in an elliptical structure; side cavities (15) are respectively provided inside the shock absorbing pad (14) and on both sides of the central cavity (16).

5. A cryogenic stop valve suitable for natural gas transportation according to claim 1, characterized in that: A valve stem (4) is vertically arranged in the middle of the top surface of the valve body (3); the upper end of the valve stem (4) extends to above the heating mechanism and is sleeved with a sleeve (5).

6. A cryogenic stop valve suitable for natural gas transportation according to claim 5, characterized in that: The surfaces of the sleeve (5) and the valve stem (4) are both provided with screw holes, the surface of the sleeve (5) is symmetrically provided with a handle (7), and the surface of the handle (7) is provided with a threaded structure (6) and is connected to the screw hole via the threaded structure (6).

Images