Anti-freezing device for liquefied petroleum gas transmission pipeline valve assembly

Abstract

The invention discloses an anti-freezing device for a liquefied petroleum gas transmission pipeline valve assembly, and relates to the field of anti-freezing devices.The anti-freezing device comprises an upper sealing box and a lower sealing box which are used for clamping and sealing the valve assembly, and the upper sealing box and the lower sealing box are each provided with a containing groove used for containing a transmission pipeline; the upper sealing box and the lower sealing box are connected through a connecting mechanism, an anti-freezing mechanism is installed in the upper sealing box, the connecting mechanism comprises upper connecting plates, the upper connecting plates are arranged at the bottoms of the front side and the rear side of the upper sealing box, and the upper connecting plates are fixedly connected with the upper sealing box. By arranging the battery, the heating plate, the upper sealing box and the lower sealing box, the temperature above zero DEG C is continuously kept in the upper sealing box and the lower sealing box, freezing of the valve assembly is avoided, kinetic energy generated during liquefied petroleum gas transmission is utilized, the small generator is continuously driven to operate, power is supplied to the battery and the heating plate, the heating plate can continuously operate, and the service life of the valve assembly is prolonged. And an external power supply is not needed.

Description

Technical Field

[0001] This invention relates to the field of antifreeze devices, and more particularly to antifreeze devices for valve assemblies in liquefied petroleum gas transmission pipelines. Background Technology

[0002] Liquefied petroleum gas (LPG) transmission pipelines are dedicated pipelines for transporting LPG. According to the "Special Equipment Manufacturing Unit Licensing Rules" (TSG07-2019), they can be divided into long-distance pipelines (GA class) and public utility pipelines (GB class). GA1 class long-distance pipelines have a design pressure ≥4.0 MPa and are mainly used for inter-regional transmission. GB1 class public utility pipelines serve urban or rural public utilities, responsible for transporting LPG from gate stations, storage and distribution stations to users or plant stations. The average flow velocity of LPG in the pipeline can be between 0.8 m / s and 1.4 m / s, and must not exceed 3 m / s to prevent static electricity buildup and pipeline overpressure. Pipeline connections are primarily welded. Flange or threaded connections can be used between pipelines and equipment, valves, etc. Compensation measures should preferably use natural compensation or Π-type compensators; packed-type compensators should not be used to avoid pipeline blockage or damage. Liquefied petroleum gas (LPG) pipeline transportation systems generally include a starting station equipped with a hydrocarbon pump for pressurization and a storage tank of appropriate capacity. For longer transportation distances, intermediate pumping stations are also required to maintain pipeline pressure and ensure smooth LPG delivery. Regarding safety, the pipeline should have good insulation to prevent heat transfer from the surrounding medium. Safety valves connected to vent tanks should be installed at the inlet and outlet to prevent excessive pressure due to temperature rise when the pipeline stops. Vent valves should be installed between valves in pipeline sections. For above-ground pipelines, a pipeline safety valve should be installed between two valves. The vent pipe openings of safety valves and vent valves should be at least 2.5 meters above the ground. For corrosion protection, the pipeline should employ a combination of external anti-corrosion layer and cathodic protection to prevent corrosion, extend service life, and ensure safe transportation.

[0003] Currently, to prevent valve assemblies on liquefied petroleum gas (LPG) transmission pipelines from freezing, antifreeze devices are often installed on the valve assemblies. For example, patent application number 202122404831.3 discloses an anti-rolling antifreeze device for LPG pipeline valve assemblies, including a base box and a top cover that are fitted together to form an insulated chamber, and an anti-rolling component. The anti-rolling component includes a fixing frame, a cover frame, and two nuts. The fixing frame is fixed to the inner wall of the base box and includes a first arc-shaped plate for securing the lower half of the LPG pipeline within the first arc-shaped plate. The cover frame includes a second arc-shaped plate that cooperates with the first arc-shaped plate for securing the upper half of the LPG pipeline within the second arc-shaped plate. During installation, the first and second arc-shaped plates cover the LPG pipeline from top to bottom, and the base box is fixed to the LPG pipeline by tightening the screws with nuts. This utility model has the advantages of simple and compact structure, convenient and flexible operation, and good installation stability.

[0004] Patent application number 202111121763.8 discloses an outdoor valve for oil pipelines with antifreeze function, including a valve body, an insulation mechanism installed on the valve body, multiple locking mechanisms connected to the insulation mechanism, a support mechanism installed on the insulation mechanism, a control mechanism connected to the support mechanism, and a discharge mechanism installed on the insulation mechanism. The locking mechanisms facilitate the disassembly and assembly of the insulation mechanism and the valve body. The insulation mechanism helps convert solar energy into electrical energy and generate heat to heat and insulate the outside of the valve body, preventing the valve body from freezing and cracking in winter. The control mechanism facilitates the driving control of the support mechanism, allowing for angle adjustment and convenient storage. The discharge mechanism facilitates the release of moisture and pressure generated between the insulation mechanism and the valve body, reducing damage to both the valve body and the insulation mechanism and extending their service life.

[0005] The aforementioned antifreeze devices and similar antifreeze devices mostly use physical isolation to separate the valve from the cold outside air, achieving the effect of heat preservation and antifreeze. However, the heat preservation effect of this method is limited, especially in winter when the outside temperature is extremely low, the valve may still freeze. Summary of the Invention

[0006] The purpose of this invention is to provide an antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines, in order to solve the above-mentioned technical problems.

[0007] An antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines includes an upper sealing box and a lower sealing box for clamping and sealing the valve assembly. Both the upper and lower sealing boxes are provided with receiving grooves for accommodating the transmission pipeline. The upper and lower sealing boxes are connected by a connecting mechanism. An antifreeze mechanism is installed inside the upper sealing box.

[0008] Preferably, the connecting mechanism includes an upper connecting plate, and upper connecting plates are provided on the bottom of both the front and rear sides of the upper sealing box, and the upper connecting plates are fixedly connected to the upper sealing box.

[0009] Preferably, the connecting mechanism further includes a lower connecting plate, and the lower connecting plates are provided on the top of both the front and rear sides of the lower sealing box, and the lower connecting plates are fixedly connected to the lower sealing box.

[0010] Preferably, the upper connecting plate is threaded with a plurality of connecting screws.

[0011] Preferably, the lower connecting plate has multiple threaded holes, which are threadedly engaged with connecting screws.

[0012] Preferably, the antifreeze mechanism includes a mounting plate located at the top of the upper sealed box, a battery disposed at the bottom of the mounting plate and fixedly connected to the mounting plate, a heating plate disposed on the right side of the battery and fixedly connected to the bottom of the mounting plate, and electrically connected to the battery.

[0013] Preferably, both ends of the mounting plate are threaded with connecting screws, and the connecting screws are threaded to the upper sealing box.

[0014] Preferably, a sealed bearing is provided at the top of the transmission pipe, the outer ring of the sealed bearing penetrates through the transmission pipe, the outer ring of the sealed bearing is fixedly connected to the transmission pipe, the sealed bearing is sleeved on the drive shaft, the drive shaft is fixedly connected to the inner ring of the sealed bearing, a small generator is provided above the transmission pipe, the small generator is fixedly connected to the bottom of the mounting plate, the power input end of the small generator is fixedly connected to the top of the drive shaft, the small generator is electrically connected to the battery, and a power component for driving the drive shaft to rotate is installed inside the transmission pipe.

[0015] Preferably, the power assembly includes a one-way bearing, which is sleeved in the middle of the drive shaft. The inner ring of the one-way bearing is fixedly connected to the drive shaft, the outer ring of the one-way bearing is fixedly connected to one end of the drive plate, the other end of the drive plate is fixedly connected to one end of a spring, the other end of the spring is fixedly connected to one end of a fixing rod, the other end of the fixing rod is fixedly connected to one end of a plurality of brackets, the other end of the brackets is fixedly connected to a fixing ring, and the fixing ring is fixedly connected to the inner wall of the transmission pipeline.

[0016] Preferably, a bearing is fitted at the bottom of the drive shaft, the inner ring of the bearing is fixedly connected to the drive shaft, and the outer ring of the bearing is fixedly connected to the inner wall of the transmission pipe.

[0017] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0018] The beneficial effects of this invention are:

[0019] This invention designs an antifreeze device for valve assemblies in liquefied petroleum gas (LPG) transmission pipelines. By incorporating a battery, a heating plate, an upper sealing box, and a lower sealing box, the upper and lower sealing boxes are kept at a temperature above zero degrees Celsius, preventing the valve assembly from freezing. Furthermore, the kinetic energy generated during LPG transmission continuously drives a small generator to power the battery and heating plate, enabling the heating plate to operate continuously without the need for an external power source. This effectively solves the problem of limited insulation in existing antifreeze devices, especially in winter when the outside temperature is extremely low, causing the valves to still freeze. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to the present invention.

[0021] Figure 2 This is a schematic diagram of the internal structure of the antifreeze device for the valve assembly of the liquefied petroleum gas transmission pipeline of the present invention.

[0022] Figure 3 This invention relates to an antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines. Figure 2 Enlarged schematic diagram of part A;

[0023] Figure 4 This invention relates to an antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines. Figure 2 Enlarged schematic diagram of part B;

[0024] Reference numerals: 1. Upper sealing box; 2. Receiving groove; 3. Connecting screw; 4. Upper connecting plate; 5. Threaded hole; 6. Lower connecting plate; 7. Transmission pipe; 8. Lower sealing box; 9. Drive shaft; 10. Heating plate; 11. One-way bearing; 12. Bracket; 13. Fixing ring; 14. Fixing rod; 15. Sealed bearing; 16. Connecting screw; 17. Mounting plate; 18. Battery; 19. Power input end; 20. Small generator; 21. Drive plate; 22. Bearing; 23. Spring. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Example 1

[0029] like Figure 1-4 As shown, the antifreeze device for valve assembly of liquefied petroleum gas transmission pipeline includes an upper sealing box 1 and a lower sealing box 8 for clamping and sealing the valve assembly. Both the upper sealing box 1 and the lower sealing box 8 are provided with receiving grooves 2 for accommodating the transmission pipeline 7. The upper sealing box 1 and the lower sealing box 8 are connected by a connecting mechanism. An antifreeze mechanism is installed inside the upper sealing box 1.

[0030] The connecting mechanism includes an upper connecting plate 4, which is provided on the bottom of both the front and rear sides of the upper sealing box 1 and is fixedly connected to the upper sealing box 1; the connecting mechanism also includes a lower connecting plate 6, which is provided on the top of both the front and rear sides of the lower sealing box 8 and is fixedly connected to the lower sealing box 8; multiple connecting screws 3 are threadedly connected to the upper connecting plate 4, and multiple threaded holes 5 are provided on the lower connecting plate 6, which are threadedly engaged with the connecting screws 3.

[0031] The upper sealing box 1 and the lower sealing box 8 enclose the valve assembly from the upper and lower sides. The connecting screws 3 fix the upper connecting plate 4 and the lower connecting plate 6 together, thereby fixing the upper sealing box 1 and the lower sealing box 8 on the valve pipeline, so that the transmission pipeline 7 is placed in the receiving groove 2. The upper sealing box 1 and the lower sealing box 8 are used to protect and insulate the valve assembly, initially preventing the valve assembly from freezing.

[0032] Example 2

[0033] like Figure 1-4 As shown, while other parts are the same as in Embodiment 1, the difference between this embodiment and Embodiment 1 is that: the antifreeze mechanism includes a mounting plate 17, which is located at the top inside the upper sealed box 1. A battery 18 is provided at the bottom of the mounting plate 17 and is fixedly connected to the mounting plate 17. A heating plate 10 is provided on the right side of the battery 18 and is fixedly connected to the bottom of the mounting plate 17. The heating plate 10 is electrically connected to the battery. Both ends of the mounting plate 17 are threaded with connecting screws 16, which are threadedly connected to the upper sealed box 1.

[0034] The heating plate 10 is powered by the battery 18, which heats the air inside the upper sealing box 1 and the lower sealing box 8, further preventing the valve assembly from freezing.

[0035] Example 3

[0036] like Figure 1-4As shown, while other parts are the same as in Embodiment 2, the difference between this embodiment and Embodiment 2 is that: a sealed bearing 15 is provided at the top of the transmission pipe 7, the outer ring of the sealed bearing 15 passes through the transmission pipe 7, the outer ring of the sealed bearing 15 is fixedly connected to the transmission pipe 7, the sealed bearing 15 is sleeved on the drive shaft 9, the drive shaft 9 is fixedly connected to the inner ring of the sealed bearing 15, a small generator 20 is provided above the transmission pipe 7, the small generator 20 is fixedly connected to the bottom of the mounting plate 17, the power input end 19 of the small generator 20 is fixedly connected to the top of the drive shaft 9, the small generator 20 is electrically connected to the battery 18, and a power component for driving the drive shaft 9 to rotate is installed inside the transmission pipe 7.

[0037] The power assembly includes a one-way bearing 11, which is sleeved in the middle of the drive shaft 9. The inner ring of the one-way bearing 11 is fixed to the drive shaft 9, and the outer ring of the one-way bearing 11 is fixed to one end of the drive plate 21. The other end of the drive plate 21 is fixed to one end of the spring 23, and the other end of the spring 23 is fixed to one end of the fixing rod 14. The other end of the fixing rod 14 is fixed to one end of a plurality of brackets 12, and the other end of the brackets 12 is fixed to a fixing ring 13. The fixing ring 13 is fixed to the inner wall of the transmission pipe 7. A bearing 22 is sleeved at the bottom of the drive shaft 9. The inner ring of the bearing 22 is fixed to the drive shaft 9, and the outer ring of the bearing 22 is fixed to the inner wall of the transmission pipe 7.

[0038] During the transmission of liquefied petroleum gas within the transmission pipeline 7, the drive plate 21 is continuously struck, causing it to swing back and forth. Since the drive plate 21 is connected to the one-way bearing 11, when the drive plate 21 swings clockwise, the one-way bearing 11 is not locked, and the drive plate 21 cannot drive the transmission shaft 9 to rotate through the one-way bearing 11. When the drive plate 21 swings counterclockwise, the one-way bearing 11 is locked, and the drive plate 21 can drive the transmission shaft 9 to rotate through the one-way bearing 11. Therefore, when the drive plate 21 swings back and forth, the transmission shaft 9 can only rotate in one direction to drive the small generator 20 to operate, so that the small generator 20 continuously supplies power to the battery 18, causing the heating plate 10 to continuously heat up.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines, characterized in that: It includes an upper sealing box (1) and a lower sealing box (8) for clamping and sealing valve assemblies. Both the upper sealing box (1) and the lower sealing box (8) are provided with receiving grooves (2) for accommodating transmission pipes (7). The upper sealing box (1) and the lower sealing box (8) are connected by a connecting mechanism. An antifreeze mechanism is installed inside the upper sealing box (1).

2. The antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to claim 1, characterized in that: The connecting mechanism includes an upper connecting plate (4). The upper sealing box (1) is provided with upper connecting plates (4) on both the front and rear bottom sides. The upper connecting plates (4) are fixedly connected to the upper sealing box (1).

3. The antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to claim 2, characterized in that: The connecting mechanism also includes a lower connecting plate (6), and the lower sealing box (8) is provided with a lower connecting plate (6) on the top of both the front and rear sides. The lower connecting plate (6) is fixedly connected to the lower sealing box (8).

4. The antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to claim 3, characterized in that: The upper connecting plate (4) is threaded with multiple connecting screws (3).

5. The antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to claim 4, characterized in that: The lower connecting plate (6) has multiple threaded holes (5), which are threadedly engaged with the connecting screws (3).

6. The antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to claim 1, characterized in that: The antifreeze mechanism includes a mounting plate (17), which is located at the top of the upper sealed box (1). A battery (18) is provided at the bottom of the mounting plate (17), and the battery (18) is fixedly connected to the mounting plate (17). A heating plate (10) is provided on the right side of the battery (18), and the heating plate (10) is fixedly connected to the bottom of the mounting plate (17). The heating plate (10) is electrically connected to the battery.

7. The antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to claim 6, characterized in that: The mounting plate (17) has connecting screws (16) threaded to both the left and right ends, and the connecting screws (16) are threaded to the upper sealing box (1).

8. The antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to claim 7, characterized in that: A sealed bearing (15) is provided at the top of the transmission pipe (7). The outer ring of the sealed bearing (15) passes through the transmission pipe (7) and is fixedly connected to the transmission pipe (7). The sealed bearing (15) is sleeved on the drive shaft (9). The drive shaft (9) is fixedly connected to the inner ring of the sealed bearing (15). A small generator (20) is provided above the transmission pipe (7). The small generator (20) is fixedly connected to the bottom of the mounting plate (17). The power input end (19) of the small generator (20) is fixedly connected to the top of the drive shaft (9). The small generator (20) is electrically connected to the battery (18). A power component for driving the drive shaft (9) to rotate is installed inside the transmission pipe (7).

9. The antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to claim 8, characterized in that: The power assembly includes a one-way bearing (11), which is sleeved in the middle of the drive shaft (9). The inner ring of the one-way bearing (11) is fixed to the drive shaft (9), and the outer ring of the one-way bearing (11) is fixed to one end of the drive plate (21). The other end of the drive plate (21) is fixed to one end of the spring (23). The other end of the spring (23) is fixed to one end of the fixing rod (14). The other end of the fixing rod (14) is fixed to one end of a plurality of brackets (12). The other end of the brackets (12) is fixed to a fixing ring (13). The fixing ring (13) is fixed to the inner wall of the transmission pipe (7).

10. The antifreeze device for valve assemblies in liquefied petroleum gas transmission pipelines according to claim 9, characterized in that: The bottom of the drive shaft (9) is fitted with a bearing (22), the inner ring of the bearing (22) is fixed to the drive shaft (9), and the outer ring of the bearing (22) is fixed to the inner wall of the transmission pipe (7).

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