Leak-proof device for liquid unloading

Abstract

The utility model belongs to the technical field of unloading devices, and particularly relates to a liquid unloading leakproof device. Comprising a liquid-phase pipeline and a gas-phase pipeline, the liquid-phase pipeline comprises a before-pumping conveying pipe, the before-pumping conveying pipe is connected with a storage tank through a shield pump and an after-pumping conveying pipe, a liquid level transmitter is arranged on the storage tank, an electrostatic grounding controller is arranged on the storage tank, a flow control switch is arranged on the before-pumping conveying pipe, and a liquid level sensor is arranged on the after-pumping conveying pipe. Gas detectors are arranged near the before-pump conveying pipe, the shield pump and the after-pump conveying pipe, a pressure transmitter is arranged on the gas-phase pipeline, the nitrogen main pipeline is connected with the before-pump conveying pipe and the gas-phase pipeline, and when the static index of the device is not up to the standard, the shield pump cannot be started. And when no liquid flows in the transportation pipe before the pump, the shield pump is automatically shut down. The storage tank is provided with the liquid level transmitter, when the liquid level in the storage tank reaches the highest liquid level, the shield pump stops feeding, and the pressure in the storage tank is prevented from being too large.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle unloading devices, and in particular relates to a liquid vehicle unloading anti-leakage device. Background Art

[0002] During the loading and unloading process of flammable and explosive liquids, the conditions that can be implemented are very harsh, and various emergencies may occur, such as raw material leakage, unqualified electrostatic grounding, gas phase pipeline blockage, etc., continuing to unload is prone to fire or explosion accidents, causing damage to people and property. The unloading pump cannot continue to operate in many cases and needs to be stopped to ensure the safety of the production process. The operation process of the traditional flammable and explosive liquid unloading system is complicated, requiring operators to have high professional skills and rich experience. Once improperly operated, it may cause safety accidents.

[0003] The unloading device in the prior art lacks a complete monitoring method, and is unable to grasp the changes of various parameters during the loading and unloading process in real time, making it difficult to discover and deal with potential safety hazards in a timely manner.

[0004] In summary, the existing flammable and explosive liquid unloading devices or systems have many problems and shortcomings, and a new, safe and efficient solution is urgently needed. Utility Model Content

[0005] The utility model provides a liquid unloading anti-leakage device to solve the problems of complicated operation process and imperfect safety unloading measures of an inflammable and explosive liquid unloading system.

[0006] In order to solve the above problems, the technical solution of the utility model is:

[0007] The liquid unloading anti-leakage device described in the utility model comprises a liquid phase pipeline and a gas phase pipeline, the liquid phase pipeline comprises a pre-pump transport pipe, the pre-pump transport pipe is connected to a storage tank through a shielded pump and a post-pump transport pipe, the storage tank is provided with a liquid level transmitter, the storage tank is provided with an electrostatic grounding controller, the pre-pump transport pipe is provided with a flow control switch, gas detectors are provided near the pre-pump transport pipe, the shielded pump and the post-pump transport pipe, the gas phase pipeline is provided with a pressure transmitter, the nitrogen main pipeline is divided into a first nitrogen branch line and a second nitrogen branch line, the first nitrogen branch line is connected to the pre-pump transport pipe, the second nitrogen branch line is connected to the gas phase pipeline, the pre-pump transport pipe is provided with a material safety break valve, and the gas phase pipeline is provided with a gas safety break valve.

[0008] In case of leakage, the material safety breakaway valve and gas safety breakaway valve can quickly cut off the flow of liquid, prevent leakage pollution, prevent fire, explosion and other accidents, and ensure the safety of personnel and property.

[0009] The canned motor pump has a fully enclosed structure with no dynamic seals and only static seals at the outer casing of the canned motor pump. Therefore, it can achieve complete leakage-free operation and effectively prevent the leakage of flammable and explosive chemicals.

[0010] Furthermore, a filter is provided on the transport pipe before the pump.

[0011] Furthermore, an emergency shut-off valve is provided on the pre-pump transport pipe, and a first check valve and a pressure gauge are provided on the pre-pump transport pipe.

[0012] Furthermore, the output end of the electrostatic grounding controller is connected to the control end of the canned pump.

[0013] When the electrostatic index does not meet the standard, the canned motor pump cannot start.

[0014] Furthermore, the output end of the flow control switch is connected to the control end of the canned pump.

[0015] When there is no liquid flowing in the transport pipe in front of the pump, the shielded pump will be automatically shut down.

[0016] Furthermore, a second check valve is provided on the nitrogen main pipeline.

[0017] Furthermore, the output end of the gas detector is electrically connected to the control end of the shielded pump.

[0018] When material leaks, it can quickly alarm and stop the shielded pump.

[0019] Furthermore, the output end of the liquid level transmitter is electrically connected to the control end of the canned pump.

[0020] When the liquid level in the tank reaches the maximum level, the level transmitter controls the shielded pump to stop feeding to prevent excessive pressure in the tank.

[0021] Furthermore, the output end of the pressure transmitter is electrically connected to the control end of the canned pump.

[0022] When the gas phase pipeline is blocked, the shielded pump cannot be started, preventing abnormal pressure in the tank.

[0023] When an emergency occurs, the DCS can control the shielded pump to stop and cut off the emergency shut-off valve at the same time.

[0024] The beneficial effects of the utility model are as follows:

[0025] 1) The utility model replaces the common transport pump with a shielded pump. The shielded pump is a fully enclosed structure without dynamic seals. Only static seals exist at the outer shell of the shielded pump. Therefore, it can achieve complete leakage-free and effectively prevent the leakage of flammable and explosive chemicals.

[0026] 2) In case of leakage, the material safety breakaway valve and gas safety breakaway valve can quickly cut off the flow of liquid, prevent leakage pollution, prevent fire, explosion and other accidents, and ensure the safety of personnel and property.

[0027] 3) When the static electricity index of the utility model does not meet the standard, the shielded pump cannot be started. When there is no liquid flowing in the transport pipe in front of the pump, the shielded pump is automatically shut down. The utility model is equipped with a gas detector, which can quickly alarm and stop the shielded pump when the material leaks. The storage tank is equipped with a liquid level transmitter. When the liquid level in the storage tank reaches the highest level, the liquid level transmitter controls the shielded pump to stop feeding to prevent excessive pressure in the storage tank.

[0028] 4) The utility model is equipped with a pressure transmitter in the gas phase pipeline. When the gas phase pipeline is blocked, the shielded pump cannot be started to prevent abnormal pressure in the storage tank. When an emergency occurs, the shielded pump can be stopped by DCS and the emergency shut-off valve can be cut off at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of the liquid unloading anti-leakage device of the utility model;

[0031] In the figure: 1. Transport pipe before the pump; 101. Material safety break valve; 102. Emergency shut-off valve; 103. Flow control switch; 104. Filter; 2. Shielded pump; 3. Transport pipe after the pump; 301. First check valve; 4. Storage tank; 5. Nitrogen main pipeline; 501. First nitrogen branch pipeline; 502. Second nitrogen branch pipeline; 503. Second check valve; 6. Gas phase pipeline; 601. Gas safety break valve; 7. Pressure gauge; 8. Electrostatic grounding controller; 9. Liquid level transmitter; 10. Pressure transmitter; 11. Gas detector. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below in conjunction with the embodiments.

[0033] In one embodiment, Figure 1As shown, the liquid unloading anti-leakage device comprises a liquid phase pipeline and a gas phase pipeline 6, the liquid phase pipeline comprises a pre-pump transport pipe 1, the pre-pump transport pipe 1 is connected to a storage tank 4 through a shielded pump 2 and a post-pump transport pipe 3, a liquid level transmitter 9 is provided on the storage tank 4, an electrostatic grounding controller 8 is provided on the storage tank 4, a flow control switch 103 is provided on the pre-pump transport pipe 1, a gas detector 11 is provided near the pre-pump transport pipe 1, the shielded pump 2 and the post-pump transport pipe 3, a pressure transmitter 10 is provided on the gas phase pipeline 6, the nitrogen main pipeline 5 is divided into a first nitrogen branch line 501 and a second nitrogen branch line 502, the first nitrogen branch line 501 is connected to the pre-pump transport pipe 1, the second nitrogen branch line 502 is connected to the gas phase pipeline 6, the pre-pump transport pipe 1 is provided with a material safety break valve 101, and the gas phase pipeline 6 is provided with a gas safety break valve 601.

[0034] In case of leakage, the material safety breakaway valve 101 and the gas safety breakaway valve 601 can quickly cut off the flow of liquid, prevent leakage pollution, prevent accidents such as fire and explosion, and ensure the safety of personnel and property.

[0035] The canned pump 2 is a fully enclosed structure without dynamic seals, and only static seals exist at the outer shell of the canned pump 2, so it can achieve complete leakage-free and effectively prevent the leakage of flammable and explosive chemicals.

[0036] It can be understood that a filter 104 is provided on the pre-pump transport pipe 1 .

[0037] It can be understood that the pre-pump transport pipe 1 is provided with an emergency shut-off valve 102 , and the pre-pump transport pipe 1 is provided with a first check valve 301 and a pressure gauge 7 .

[0038] It can be understood that the output end of the electrostatic grounding controller 8 is connected to the control end of the canned motor pump 2 .

[0039] When the electrostatic index does not meet the standard, the canned motor pump 2 cannot be started.

[0040] It can be understood that the output end of the flow control switch 103 is connected to the control end of the canned pump 2 .

[0041] When there is no liquid flowing in the transport pipe 1 in front of the pump, the shielded pump 2 is automatically shut down.

[0042] It can be understood that a second check valve 503 is provided on the nitrogen main pipeline 5 .

[0043] It can be understood that the output end of the gas detector 11 is electrically connected to the control end of the shielded pump 2 .

[0044] When material leaks, an alarm can be quickly given and the shielded pump 2 can be stopped.

[0045] It can be understood that the output end of the liquid level transmitter 9 is electrically connected to the control end of the canned pump 2 .

[0046] When the liquid level in the storage tank 4 reaches the highest level, the liquid level transmitter 9 controls the shielded pump 2 to stop feeding to prevent the pressure in the storage tank 4 from being too high.

[0047] It can be understood that the output end of the pressure transmitter 10 is electrically connected to the control end of the canned pump 2 .

[0048] When the gas phase pipeline 6 is blocked, the shielded pump 2 cannot be started, preventing abnormal pressure in the storage tank 4.

[0049] When an emergency occurs, the DCS can control the canned motor pump 2 to stop and cut off the emergency cut-off valve 102 at the same time.

[0050] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A liquid unloading anti-leakage device, characterized in that: The invention comprises a liquid phase pipeline and a gas phase pipeline (6), wherein the liquid phase pipeline comprises a pre-pump transport pipe (1), the pre-pump transport pipe (1) is connected to a storage tank (4) via a shielded pump (2) and a post-pump transport pipe (3), the storage tank (4) is provided with a liquid level transmitter (9), the storage tank (4) is provided with an electrostatic grounding controller (8), the pre-pump transport pipe (1) is provided with a flow control switch (103), and gas flow control devices are provided near the pre-pump transport pipe (1), the shielded pump (2) and the post-pump transport pipe (3). A nitrogen detector (11) is provided on the gas phase pipeline (6), a pressure transmitter (10) is provided on the nitrogen main pipeline (5), the nitrogen main pipeline (5) is divided into a first nitrogen branch pipeline (501) and a second nitrogen branch pipeline (502), the first nitrogen branch pipeline (501) is connected to the pre-pump transport pipe (1), the second nitrogen branch pipeline (502) is connected to the gas phase pipeline (6), the pre-pump transport pipe (1) is provided with a material safety break valve (101), and the gas phase pipeline (6) is provided with a gas safety break valve (601).

2. The liquid unloading anti-leakage device according to claim 1, characterized in that: The pre-pump transport pipe (1) is provided with a filter (104).

3. The liquid unloading anti-leakage device according to claim 1, characterized in that: The front-pump transport pipe (1) is provided with an emergency shut-off valve (102), and the front-pump transport pipe (1) is provided with a first check valve (301) and a pressure gauge (7).

4. The liquid unloading anti-leakage device according to claim 1, characterized in that: The output end of the electrostatic grounding controller (8) is connected to the control end of the canned motor pump (2).

5. The liquid unloading anti-leakage device according to claim 1, characterized in that: The output end of the flow control switch (103) is connected to the control end of the canned motor pump (2).

6. The liquid unloading anti-leakage device according to claim 1, characterized in that: The nitrogen main pipeline (5) is provided with a second check valve (503).

7. The liquid unloading anti-leakage device according to claim 1, characterized in that: The output end of the gas detector (11) is electrically connected to the control end of the shielded pump (2).

8. The liquid unloading anti-leakage device according to claim 1, characterized in that: The output end of the liquid level transmitter (9) is electrically connected to the control end of the shielded pump (2).

9. The liquid unloading anti-leakage device according to claim 1, characterized in that: The output end of the pressure transmitter (10) is electrically connected to the control end of the canned pump (2).

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