A transport tank capable of achieving gas phase pressure self-balancing

Abstract

This invention provides a transport tank capable of achieving self-balancing gas phase pressure, addressing the technical problems of existing transport tanks where the pressure in the gas phase space inside the tank is unbalanced with the pressure in the gas phase space within the extraction pipe. This leads to issues such as the medium being forced out through the extraction pipe when the flange cover of the extraction pipe is not properly sealed, and the need for manual opening of the extraction pipe flange cover during loading. The self-balancing transport tank of this invention, through the cooperation of the connecting holes A, B, and C of the ball valve with the various through holes on the valve body, allows liquid to be extracted from the tank when the valve is open, ensuring unloading operations. When the valve is closed, the gas phase space inside the extraction pipe is connected to the gas phase space inside the tank through the connecting holes C and B and the vent, completely eliminating the liquid level difference between the extraction pipe and the tank, and preventing the medium from being forced out through the extraction pipe.

Description

Technical Field

[0001] This invention relates to transport tanks for railways and highways, and more specifically to a transport tank capable of achieving self-balancing of gas phase pressure. Background Technology

[0002] Currently, the most common method for loading and unloading liquids from tank trucks or tank containers is top-loading and top-unloading, such as... Figure 1 The diagram shows a common tank structure for existing tank trucks or tank containers. It features an air inlet pipe 03 at the top of the tank and a liquid extraction pipe 01 that connects directly to the liquid accumulation pit at the bottom of the tank 02 for unloading operations. However, this type of transport tank has the following drawbacks: 1. During normal vehicle operation, the flange covers of the air inlet pipe 03 and the liquid extraction pipe 01 must be tightly closed to prevent leakage of the medium inside the tank. However, this leads to an imbalance between the pressure in the gas phase space inside the tank 02 and the pressure in the gas phase space inside the liquid extraction pipe 01. After the tank 02 is exposed to sunlight, the pressure in the gas phase space inside the tank 02 increases. If the flange cover of the liquid extraction pipe 01 is not sealed tightly, the medium will be forced out through the liquid extraction pipe 01 inserted into the liquid phase space of the tank. 2. During loading, to avoid increasing the pressure in the upper gas phase space of the liquid extraction pipe 01, the flange cover of the liquid extraction pipe 01 must be manually opened. Summary of the Invention

[0003] The purpose of this invention is to solve the technical problems of existing transport tanks, such as the imbalance between the pressure of the gas phase space inside the tank and the pressure of the gas phase space inside the liquid extraction pipe, the medium being forced out through the liquid extraction pipe inserted into the liquid phase space when the flange cover of the liquid extraction pipe is not sealed tightly, and the need to manually open the flange cover of the liquid extraction pipe during loading. The invention provides a transport tank that can achieve self-balancing of gas phase pressure.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A transport tank capable of achieving gas phase pressure self-balancing includes a tank body, the top of which is provided with an air inlet pipe. The special feature is that the top of the tank body is also provided with an unloading structure.

[0006] The unloading structure includes a passage ball valve, a pipe seat, and a liquid extraction pipe;

[0007] The ball valve includes a valve body, a valve disposed within the valve body, and a handle; the handle is connected to the outer wall of the valve, and one end extends out of the valve body; the valve has interconnected connecting holes A, B, and C, all of which extend to the outside of the valve.

[0008] The top of the tank body is provided with a through hole that matches the diameter of the pipe seat for welding to the outer wall of the pipe seat; the upper end of the pipe seat extends out of the outside of the tank body and is provided with a pipe seat flange at its upper end; the upper end face of the pipe seat flange is sealed to the lower end face of the flange at the lower end of the valve body and is internally connected.

[0009] The liquid extraction pipe is located inside the tank body, with its upper end passing through the pipe seat and connected to the pipe seat flange, and its lower end extending into the liquid accumulation pit at the bottom of the tank body.

[0010] The valve body has a first through hole at the other end of the corresponding connecting hole A, which communicates with the outside. The valve body has a second through hole at the other end of the corresponding connecting hole B, which communicates with the flange through hole of the valve body flange.

[0011] The valve body has a vent passage, one end of which is connected to the outer wall of the valve, and the other end extends out of the bottom of the valve body. The pipe seat flange and the pipe seat are respectively provided with a first vent hole and a second vent hole axially at the position corresponding to the other end of the vent passage. When the handle drives the valve to rotate, the connecting hole C is connected to the second vent hole, and the connecting hole B is connected to one end of the vent passage.

[0012] Furthermore, a valve cover is provided on the valve body at the position corresponding to the first through hole.

[0013] Furthermore, the diameters of the connecting holes A and B are the same, and are larger than the diameter of the connecting hole C;

[0014] The diameter of the connecting hole C is larger than the diameter of the vent.

[0015] Furthermore, the diameter of the second vent is larger than that of the first vent, and the second vent is connected to the through hole of the liquid extraction tube on the tube seat.

[0016] Furthermore, the flange of the pipe seat is fixed to the flange of the valve body, the flange of the pipe seat is fixed to the pipe seat, and the valve body is fixed to the valve cover by bolts;

[0017] Sealing rings are provided at the connection between the pipe seat flange and the flange at the lower end of the valve body, at the connection between the pipe seat flange and the pipe seat, and at the connection between the valve body and the valve cover.

[0018] Furthermore, the connecting holes A, B, and C are arranged in a T-shape.

[0019] Furthermore, the connecting holes A, B, and C are arranged in a Y-shape.

[0020] Furthermore, the pipe seat, the liquid extraction pipe, and the pipe seat flange are all manufactured using a forging process.

[0021] Furthermore, the outer wall of the upper end of the extraction tube is welded to the inner wall of the tube seat flange.

[0022] The beneficial effects of this invention are:

[0023] 1. This invention innovatively designs an unloading structure for transport tanks. By cooperating with the connecting holes A, B, and C of the ball valve and the various through holes on the valve body, when the valve is open, while maintaining the isolation between the gas phase space inside the suction pipe and the gas phase space inside the tank, the liquid inside the tank can be extracted through the connecting holes A and B and the suction pipe to ensure unloading operations. When the valve is closed, the gas phase space inside the suction pipe and the gas phase space inside the tank is connected through the connecting holes C and B and the vent, completely eliminating the liquid level difference between the suction pipe and the tank, effectively preventing the medium from being forced out through the suction pipe, and also ensuring that no liquid gushing out occurs when the unloading valve is opened. It is highly practical and can be widely used in tank cars and tank containers used for railways and highways.

[0024] 2. The transport tank provided by the present invention can achieve gas phase pressure self-balancing. The gas phase pressure inside the tank can be self-balancing by using a ball valve. When loading, there is no need to open the valve cover, which reduces the risk to operators facing acid and alkali corrosive liquids in the liquid extraction pipe.

[0025] 3. In this invention, the diameter of the connecting hole C is smaller than that of the through hole A and the connecting hole B, but larger than that of the vent. This allows for both self-balancing of the gas phase pressure inside the tank through the connecting hole C and ensures full connection between the connecting hole C and the vent.

[0026] 4. In this invention, the diameter of the second vent hole is larger than that of the first vent hole, and it is connected to the through hole of the liquid extraction tube on the tube seat, which effectively reduces the docking accuracy requirements of the second vent hole and the first vent hole, making the installation more convenient.

[0027] 5. The pipe seat, liquid extraction pipe, and pipe seat flange in this invention are all manufactured by forging machining. Compared with the traditional casting machining method, the material density of forging is better, which effectively improves the corrosion resistance of the pipe seat, liquid extraction pipe, and pipe seat flange. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the tank structure based on the existing unloading structure;

[0029] Figure 1 The attached figures are labeled as follows:

[0030] 01-Liquid extraction pipe; 02-Tank body; 03-Air inlet pipe;

[0031] Figure 2 This is a partial structural schematic diagram of an embodiment of a transport tank capable of achieving gas phase pressure self-balancing according to the present invention;

[0032] Figure 3This is a schematic diagram of the unloading structure in an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the pipe seat in the unloading structure according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the liquid extraction pipe and the pipe flange in the unloading structure of an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the passage ball valve in the open unloading state in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the ball valve in the closed state in an embodiment of the present invention.

[0037] Figures 2-7 The attached figures are labeled as follows:

[0038] 1-Passway ball valve, 11-Valve body, 12-Valve, 13-Handle, 14-Flange, 15-Ventilation duct; 2-Pipe seat flange, 21-First vent hole; 3-Pipe seat, 31-Second vent hole; 4-Liquid extraction pipe; 5-Tank body; 6-Valve cover; 7-Air inlet pipe. Detailed Implementation

[0039] To make the advantages and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 2 As shown, a transport tank capable of achieving gas phase pressure self-balancing includes a tank body 5, with an unloading structure 0 and an air inlet pipe 7 installed on the top of the tank body 5 for unloading liquid from the tank.

[0041] like Figures 3-5 As shown, the unloading structure 0 includes a passage ball valve 1, a pipe seat 3, a liquid extraction pipe 4, and a valve cover 6. The passage ball valve 1 includes a valve body 11, a valve 12, and a handle 13; the valve 12 is disposed inside the valve body 11, and the handle 13 is connected to the outer wall of the valve 12, with one end extending outside the valve body 11, for driving the valve 12 to rotate inside the valve body 11 via the handle 13.

[0042] Valve 12 has interconnected connecting holes A, B, and C, all of which extend to the outside of valve 12. In this embodiment, connecting holes A, B, and C are arranged in a T-shape; in other embodiments of the invention, they can also be arranged in a Y-shape. Since connecting holes A and B are used for unloading liquids, while connecting hole C is only used to help achieve self-balancing of the gas phase pressure inside the tank, it is preferable that the diameters of connecting holes A and B are the same and larger than the diameter of connecting hole C; simultaneously, the diameter of connecting hole C is larger than the diameter of the vent 15, ensuring full connection between connecting hole C and the vent 15.

[0043] The top of the tank body 5 has a through hole that matches the diameter of the pipe seat 3 for welding to the outer wall of the pipe seat 3. The upper end of the pipe seat 3 extends outward from the outside of the tank body 5, and a pipe seat flange 2 is provided at its upper end; the upper end face of the pipe seat flange 2 is sealed to the lower end face of the flange 14 at the lower end of the valve body 11, and the two flanges are internally connected. Specifically, the flange 2 and the flange 14, and the pipe seat flange 2 and the pipe seat 3 are all connected by bolts, and sealing rings are provided at both connections.

[0044] The pipe seat, the extraction pipe, and the pipe seat flange are all manufactured using forging technology. The pipe seat flange 2 and the extraction pipe 4 are welded as a single unit. The extraction pipe 4 passes through the pipe seat 3, with its lower end extending into the liquid accumulation pit at the bottom of the tank. The gas phase space inside the tank body 5 is connected to the gas phase space inside the extraction pipe 4. A first through hole, connecting to the outside, is opened at the other end of the connecting hole A within the valve body 11. A second through hole, connecting to the flange through hole of the valve body flange 14, is opened at the other end of the valve body 11 corresponding to the connecting hole B. This allows the extraction pipe 4 to connect to the external space of the tank sequentially through the flange through hole of the valve body flange 14, the second through hole of the valve body 11, the connecting hole B, the connecting hole A, and the first through hole of the valve body 11. Simultaneously, the valve cover 6 is located on the valve body 11 at the position corresponding to the first through hole. The valve body 11 and the valve cover 6 are connected by bolts, and a sealing ring is provided at the connection point to seal the first through hole.

[0045] A vent 15 is provided inside the valve body 11. One end of the vent 15 is connected to the outer wall of the valve 12, and the other end extends out of the bottom of the valve body 11. A first vent hole 21 is axially provided on the pipe seat flange 2 at the position corresponding to the other end of the vent 15, and a second vent hole 31 is provided on the pipe seat 3 at the corresponding position, so as to keep the vent 15 in communication with the tank body 5. Preferably, the diameter of the second vent hole 31 is larger than the diameter of the first vent hole 21, and the second vent hole 31 is connected to the through hole of the liquid extraction pipe on the pipe seat 3, which effectively reduces the docking accuracy requirements of the second vent hole and the first vent hole.

[0046] The principle by which the unloading structure 0 of this invention achieves self-balancing of gas phase pressure is as follows: Figure 6As shown, when the valve is opened, the gas phase space inside the suction pipe is kept isolated from the gas phase space inside the tank body. Liquid is extracted from the tank through the connecting holes A and B and the suction pipe to ensure unloading operations. Figure 7 As shown, when the valve is closed, the connecting hole C is connected to the second through hole, and the connecting hole B is connected to one end of the vent 15. Through the connecting hole C, the connecting hole B and the vent, the air space inside the pumping pipe and the tank is connected, thus completely eliminating the liquid level difference between the pumping pipe and the tank.

[0047] The above description is only used to illustrate the technical solutions of the present invention, and is not intended to limit them. For those skilled in the art, modifications can be made to the specific technical solutions described in the above embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by the present invention.

Claims

1. A transport tank capable of achieving gas phase pressure self-balancing, comprising a tank body (5), wherein an air inlet pipe (7) is provided on the top of the tank body (5), characterized in that: The top of the tank body (5) is also provided with an unloading structure (0); The unloading structure (0) includes a passage ball valve (1), a pipe seat (3), and a liquid extraction pipe (4); The ball valve (1) includes a valve body (11), a valve (12) disposed in the valve body (11), and a handle (13); the handle (13) is connected to the outer wall of the valve (12), and one end extends out of the valve body (11); the valve (12) has interconnected connecting holes A, B and C, and the connecting holes A, B and C all extend to the outside of the valve (12); The top of the tank body (5) is provided with a through hole that matches the diameter of the pipe seat (3) for welding to the outer wall of the pipe seat (3); the upper end of the pipe seat (3) extends out of the tank body (5) and is provided with a pipe seat flange (2); the upper end face of the pipe seat flange (2) is connected to the lower end face of the flange (14) at the lower end of the valve body (11) and is internally connected. The liquid extraction pipe (4) is located inside the tank body (5), with its upper end passing through the pipe seat (3) and connected to the pipe seat flange (2), and its lower end extending into the liquid accumulation pit at the bottom of the tank. The valve body (11) has a first through hole that communicates with the outside at the other end of the connecting hole A, and the valve body (11) has a second through hole that communicates with the flange through hole of the valve body flange (14) at the other end of the connecting hole B. The valve body (11) is provided with a vent passage (15). One end of the vent passage (15) is connected to the outer wall of the valve (12), and the other end extends out of the bottom of the valve body (11). The pipe seat flange (2) and the pipe seat (3) are respectively provided with a first vent hole (21) and a second vent hole (31) axially at the position corresponding to the other end of the vent passage (15). When the handle (13) drives the valve (12) to rotate, the connecting hole C is connected to the second vent hole, and the connecting hole B is connected to one end of the vent passage (15).

2. A transport tank capable of achieving gas phase pressure self-balancing according to claim 1, characterized in that: A valve cover (6) is provided on the valve body (11) at the position corresponding to the first through hole.

3. A transport tank capable of achieving gas phase pressure self-balancing according to claim 2, characterized in that: The diameters of the connecting holes A and B are the same, and the diameter of the connecting hole C is larger. The diameter of the connecting hole C is larger than the diameter of the vent (15).

4. A transport tank capable of achieving gas phase pressure self-balancing according to claim 3, characterized in that: The diameter of the second vent (31) is larger than that of the first vent (21), and the second vent (31) is connected to the through hole of the liquid extraction tube on the tube seat (3).

5. A transport tank capable of achieving gas phase pressure self-balancing according to claim 4, characterized in that: The pipe seat flange (2) and the flange (14) of the valve body (11), the pipe seat flange (2) and the pipe seat (3), and the valve body (11) and the valve cover (6) are all fixed by bolts; Sealing rings are provided at the connection between the pipe seat flange (2) and the flange (14) at the lower end of the valve body (11), at the connection between the pipe seat flange (2) and the pipe seat (3), and at the connection between the valve body (11) and the valve cover (6).

6. A transport tank capable of achieving gas phase pressure self-balancing according to any one of claims 1-5, characterized in that: The connecting holes A, B, and C are arranged in a T-shape.

7. A transport tank capable of achieving gas phase pressure self-balancing according to any one of claims 1-5, characterized in that: The connecting holes A, B, and C are arranged in a Y-shape.

8. A transport tank capable of achieving gas phase pressure self-balancing according to claim 1, characterized in that: The pipe seat (3), the liquid extraction pipe (4), and the pipe seat flange (2) are manufactured by forging.

9. A transport tank capable of achieving gas phase pressure self-balancing according to claim 8, characterized in that: The upper outer wall of the extraction tube (4) is welded to the inner wall of the pipe seat flange (2).

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