Negative pressure liquid injection equipment

Abstract

The utility model discloses negative-pressure liquid injection equipment which comprises a liquid storage tank and a liquid injection device, the vacuum pipeline is sequentially provided with a vacuum gauge, a first stop valve and a vacuum pump, and two ends are respectively communicated with the liquid storage tank and external atmosphere; the circulating liquid injection pipeline is sequentially provided with an oil pump and a second stop valve, and two ends are respectively communicated with the liquid storage tank and the to-be-injected product; the circulating liquid return pipeline is sequentially provided with a pressure sensor, a pressure regulating valve and a third stop valve, and two ends of the circulating liquid return pipeline are respectively communicated with the to-be-injected product and the liquid storage tank. By means of continuous vacuumizing of the vacuum pipeline and circulating oil injection of the circulating liquid injection pipeline and the circulating liquid return pipeline, a product can be completely filled with oil, and certain pressure can be stably kept, so that accumulation of steam and air in the product is reduced, potential safety hazards are avoided, and the requirements of specific working conditions are met.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid injection and addition equipment, specifically to a negative pressure liquid injection device. Background Technology

[0002] In certain special situations, maintaining a certain pressure within the liquid storage product can ensure the effective utilization and safety of the stored liquid. For example, maintaining pressure within the product can effectively improve the fluidity of the liquid, ensuring its stable delivery and precise control in pipelines. Similarly, in fuel storage, maintaining a certain pressure can reduce the accumulation of vapor and air, thereby avoiding potential safety hazards. Therefore, it is necessary to develop a liquid injection device that can inject and maintain pressure in a product. Utility Model Content

[0003] In order to meet the technical requirements of liquid injection and pressure maintenance of the product, this utility model provides a negative pressure liquid injection device.

[0004] The technical solution adopted by this utility model is as follows: A negative pressure liquid injection device includes: a liquid storage tank; a vacuum pipeline, in which a vacuum gauge, a first shut-off valve and a vacuum pump are arranged in sequence, and the two ends are respectively connected to the liquid storage tank and the outside atmosphere; a circulating liquid injection pipeline, in which an oil pump and a second shut-off valve are arranged in sequence, and the two ends are respectively connected to the liquid storage tank and the product to be injected; and a circulating liquid return pipeline, in which a pressure sensor, a pressure regulating valve and a third shut-off valve are arranged in sequence, and the two ends are respectively connected to the product to be injected and the liquid storage tank.

[0005] Preferably, it also includes a pressure relief pipeline with a pressure relief valve, the two ends of which are respectively connected to the circulating injection pipeline and the storage tank.

[0006] Preferably, the circulating injection pipeline is equipped with an oil filter after the oil pump.

[0007] Preferably, a heating pad is arranged on the bottom lower surface of the liquid storage tank.

[0008] Preferably, it also includes an outer casing with a trolley structure, wherein the liquid storage tank, vacuum pipeline, circulating liquid injection pipeline and circulating liquid return pipeline are all disposed within the outer casing.

[0009] Preferably, the end of the circulating injection pipeline and the circulating return pipeline that connects to the product to be injected is respectively provided with an injection hose and a return hose, and the ends of the injection hose and the return hose are each provided with a quick-connect coupling that matches the product to be injected.

[0010] Preferably, the front of the outer casing is provided with a receiving groove, and the injection hose and the return hose are arranged above the receiving groove; a waste liquid cylinder is provided inside the outer casing below the receiving groove, and a liquid hole communicating with the waste liquid cylinder is opened on the receiving groove.

[0011] Preferably, the bottom of the outer casing is provided with a flexible grounding strip.

[0012] Preferably, the liquid storage tank is equipped with a liquid level sensor and a visual liquid level gauge.

[0013] The vacuum pump is positioned above the liquid storage tank.

[0014] The present invention has the following beneficial effects: The present invention continuously evacuates the vacuum through the vacuum pipeline, and circulates the oil through the circulating injection pipeline and the circulating return pipeline, which can completely fill the product and maintain a stable pressure, thereby reducing the accumulation of steam and air in the product, avoiding potential safety hazards, and meeting the needs of specific working conditions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pipeline principle of an embodiment of the present utility model.

[0016] Figure 2 This is a perspective view of an embodiment of the present utility model.

[0017] Figure 3 This is a front view schematic diagram of an embodiment of the present utility model.

[0018] Figure 4 This is a schematic diagram of the open state of an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the open state from another angle of an embodiment of the present invention.

[0020] 1. Storage tank; 2. Vacuum line; 3. Vacuum gauge; 4. First shut-off valve; 5. Vacuum pump; 6. Circulating injection line; 7. Oil pump; 8. Second shut-off valve; 9. Circulating return line; 10. Pressure sensor; 11. Pressure regulating valve; 12. Third shut-off valve; 13. Pressure relief line; 14. Pressure relief valve; 15. Oil filter; 16. Heating pad; 17. Outer casing; 18. Injection hose; 19. Return hose; 20. Quick connector; 21. Receiving tank; 22. Waste liquid cylinder; 23. Grounding strip; 24. Liquid level sensor; 25. Liquid level gauge. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0022] In the embodiments, such as Figures 1-5As shown, a negative pressure liquid injection device includes: a liquid storage tank 1; a vacuum pipeline 2, which is sequentially equipped with a vacuum gauge 3, a first shut-off valve 4 and a vacuum pump 5, with both ends connected to the liquid storage tank 1 and the outside atmosphere; a circulating liquid injection pipeline 6, which is sequentially equipped with an oil pump 7 and a second shut-off valve 8, with both ends connected to the liquid storage tank 1 and the product to be injected; and a circulating liquid return pipeline 9, which is sequentially equipped with a pressure sensor 10, a pressure regulating valve 11 and a third shut-off valve 12, with both ends connected to the product to be injected and the liquid storage tank 1.

[0023] In the embodiments, such as Figure 1 As shown, the injection process is as follows:

[0024] (1) Connect the circulating injection pipeline 6 and the circulating return pipeline 9 to the oil inlet and oil return port of the product to be injected, respectively;

[0025] (2) Open the first shut-off valve 4, the second shut-off valve 8 and the third shut-off valve 12, start the vacuum pump 5, and extract a portion of the air from the storage tank 1, each pipeline and the product to be injected.

[0026] (3) After the reading of vacuum gauge 3 reaches the set vacuum level P1, start oil pump 7 and inject oil into the product to be injected through the circulating injection pipeline 6 and the circulating return pipeline 9.

[0027] (4) After the reading of vacuum gauge 3 reaches the set vacuum level P2 (P2 < P1), the pressure regulating valve 11 automatically adjusts the valve size according to the value of pressure sensor 10 so that the value on pressure sensor 10 reaches the set pressure P3, and at the same time closes the first shut-off valve 4, the second shut-off valve 8 and the third shut-off valve 12.

[0028] (5) After filling with oil, disconnect the circulating injection line 6 and the circulating return line 9.

[0029] In this embodiment, by continuously drawing a vacuum through the vacuum line 2 and circulating oil through the circulating injection line 6 and the circulating return line 9, the product can be completely filled and a certain pressure can be maintained stably. This reduces the accumulation of steam and air in the product, thereby avoiding potential safety hazards and meeting the needs of specific working conditions.

[0030] In the embodiments, such as Figure 1 As shown, it also includes a pressure relief pipeline 13, equipped with a pressure relief valve 14, with its two ends connected to the circulating liquid injection pipeline 6 and the liquid storage tank 1, respectively. The pressure relief pipeline 13 can effectively release excess pressure inside the system, prevent equipment damage or failure caused by excessive pressure, reduce potential safety hazards, and protect the safety of operators and equipment.

[0031] In the embodiments, such as Figure 1As shown, the circulating injection pipeline 6 is equipped with an oil filter 15 after the oil pump 7. The oil filter 15 can effectively remove impurities and particulate matter from the liquid, ensuring the purity of the injected liquid. At the same time, it can prevent impurities from clogging the pipeline or affecting the normal operation of the valve, ensuring the smooth flow of the liquid and improving the overall stability and reliability of the equipment.

[0032] In the embodiments, such as Figure 5 As shown, a heating pad 16 is arranged on the lower surface of the bottom of the liquid storage tank 1. The heating pad 16 is used to raise the oil temperature inside the liquid storage tank 1, which can reduce the oil viscosity in low-temperature environments, maintain sufficient fluidity, and facilitate oil filling. The external heating pad 16 has the advantages of high safety performance and uniform heating.

[0033] In the embodiments, such as Figures 2-5 As shown, the device also includes an outer casing 17 with a trolley structure. The liquid storage tank 1, vacuum pipeline 2, circulating liquid injection pipeline 6, and circulating liquid return pipeline 9 are all housed within the outer casing 17. The outer casing 17 serves as an integrated installation platform, significantly improving the mobility, protection, and ease of operation of the equipment. This allows the equipment to be easily moved between different workplaces, adapting to the usage needs of different environments.

[0034] In the embodiments, such as Figures 2-5 As shown, the ends of the circulating injection line 6 and the circulating return line 9 that connect to the product to be injected are respectively equipped with an injection hose 18 and a return hose 19. Both the injection hose 18 and the return hose 19 have quick-connect fittings 20 that match the product to be injected. The injection hose 18, the return hose 19, and the quick-connect fittings 20 make the installation and disassembly of the circulating injection line 6, the circulating return line 9, and the product to be injected more convenient, allowing operators to quickly connect or disconnect, reducing working time and operational complexity.

[0035] In the embodiments, such as Figures 3-5 As shown, the outer casing 17 has a receiving groove 21 on its front side, with the injection hose 18 and return hose 19 arranged above the receiving groove 21. Inside the outer casing 17, below the receiving groove 21, is a waste liquid cylinder 22. The receiving groove 21 has a liquid hole communicating with the waste liquid cylinder 22. The receiving groove 21 facilitates the centralized arrangement of the injection hose 18 and return hose 19, helping to neatly organize and fix the pipelines, avoiding pipeline crossing or tangling. At the same time, it can easily collect the dripping liquid at the openings of the injection hose 18 and return hose 19, and the dripping liquid can be guided to the waste liquid cylinder 22, which helps to maintain a clean and tidy working environment and prevents pollution caused by leakage of waste liquid in the working environment.

[0036] In the embodiments, such as Figure 3As shown, the bottom of the outer casing 17 is equipped with a flexible grounding strip 23. The grounding strip 23 is usually made of iron chain, which can effectively reduce static electricity accumulation, reduce equipment failures or safety hazards caused by electrostatic discharge, ensure the safety of operators, and especially meet explosion-proof requirements.

[0037] In the embodiments, such as Figure 1 , Figure 5 As shown, the liquid storage tank 1 is equipped with a liquid level sensor 24 and a visual liquid level gauge 25. The liquid level sensor 24 can continuously monitor the liquid level changes in the liquid storage tank 1 and provide liquid level data in a timely manner, helping operators to understand the actual liquid level and avoid operational interruptions due to insufficient liquid. The liquid level gauge 25 is a glass tube liquid level gauge, which allows operators to visually measure the liquid level in the liquid storage tank 1.

[0038] In the embodiments, such as Figure 5 As shown, the vacuum pump 5 is positioned above the liquid storage tank 1. This high-level installation of the vacuum pump 5 not only conforms to fluid mechanics principles, but also allows gravity to naturally return condensate or liquid water to the liquid storage tank 1, preventing condensate or liquid water from entering the pump body through pipes and causing adverse effects, thus extending equipment lifespan and improving operational stability.

[0039] Obviously, the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Other obvious variations or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A negative pressure infusion apparatus, characterized by, It includes: Liquid storage tank (1); Vacuum pipeline (2), provided with vacuum gauge (3), first stop valve (4) and vacuum pump (5) in turn, two ends are communicated with the liquid storage tank (1) and the atmosphere; Circulating liquid injection pipeline (6), provided with oil pump (7) and second stop valve (8) in turn, two ends are communicated with the liquid storage tank (1) and the product to be injected; Circulating liquid return pipeline (9), provided with pressure sensor (10), pressure regulating valve (11) and third stop valve (12) in turn, two ends are communicated with the product to be injected and the liquid storage tank (1).

2. The apparatus according to claim 1, wherein It also includes pressure relief pipeline (13), provided with pressure relief valve (14), two ends are communicated with the circulating liquid injection pipeline (6) and the liquid storage tank (1).

3. The apparatus of claim 1, wherein The circulating liquid injection pipeline (6) is provided with oil filter (15) after the oil pump (7).

4. The apparatus of claim 1, wherein The bottom surface of the liquid storage tank (1) is arranged with heating pad (16).

5. The apparatus of claim 1, wherein It also includes the outer box body (17) of trolley structure, the liquid storage tank (1), vacuum pipeline (2), circulating liquid injection pipeline (6) and the circulating liquid return pipeline (9) are arranged in the outer box body (17).

6. The apparatus of claim 5, wherein, The end of the circulating liquid injection pipeline (6) and the circulating liquid return pipeline (9) communicated with the product to be injected is respectively provided with liquid injection hose (18) and liquid return hose (19), and the distal end of the liquid injection hose (18) and the liquid return hose (19) is provided with quick connector (20) matched with the product to be injected.

7. The apparatus of claim 6, wherein The front of the outer box body (17) is provided with containing groove (21), the liquid injection hose (18) and the liquid return hose (19) are arranged above the containing groove (21); the outer box body (17) is provided with waste liquid cylinder (22) below the containing groove (21), and the containing groove (21) is provided with liquid hole communicated with the waste liquid cylinder (22).

8. The apparatus of claim 5, wherein, The bottom of the outer box body (17) is provided with flexible grounding strip (23).

9. The apparatus of claim 1, wherein, The liquid level sensor (24) and visible liquid level meter (25) are arranged on the liquid storage tank (1).

10. The apparatus of claim 1, wherein The vacuum pump (5) is arranged above the liquid storage tank (1).

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