A freezing coolant circulation device

Abstract

This utility model discloses a freezing coolant circulation device, comprising: a brine storage tank for storing circulating brine, with an installation connecting cylinder fixedly connected to one side of the brine storage tank; a refrigerant return pipe fixedly installed at the end of the installation connecting cylinder, with a return connecting pipe fixedly installed at the top of one end, a freezing return pipe fixedly connected to one end of the return connecting pipe, and a freezing flow pipe fixedly connected to the outer wall of the freezing return pipe, the freezing flow pipe and the freezing return pipe constituting a freezing pipe. This utility model encloses the low-temperature brine injection pipe inside the high-temperature brine return pipe, forming a "thermal shielding layer" that prevents heat transfer from the external environment, significantly reducing heat exchange loss of the low-temperature brine; the nested structure ensures that the low-temperature pipe only contacts the -20°C return brine, significantly reducing the effective heat transfer temperature difference, reducing cold loss, and guaranteeing the actual freezing effect of the refrigerant.

Description

Technical Field

[0001] This utility model relates to the field of coolant circulation technology, and in particular to a freezing coolant circulation device. Background Technology

[0002] In existing technologies, the types of coolants used in artificial freezing construction are mainly based on their requirements for antifreeze properties, heat conduction, and material compatibility in low-temperature environments. The coolants used in artificial freezing mainly fall into two categories: brine solutions (primarily calcium chloride) and cryogenic liquefied gases (liquid nitrogen, liquid carbon dioxide). The specific choice depends on the project requirements and the required freezing speed.

[0003] Calcium chloride (CaCl2) solution is typically prepared as a 20%–30% aqueous solution, with a freezing point that can drop to -35°C to -50°C. It is low in cost, has a large heat capacity, and good cycle stability, making it suitable for long-term freezing projects (such as subway tunnels and mines). Through a closed-loop pipeline system, the refrigeration station continuously supplies low-temperature brine (approximately -25°C to -35°C).

[0004] Artificial freezing involves refrigerant circulation (ammonia circulation), cooling water circulation, and brine circulation (refrigerant circulation). The brine circulation process involves pumping out low-temperature brine (-30°C), flowing through freezing pipes to absorb heat from the ground (raising the temperature to -20°C), and returning to the evaporator for recooling. This circulation process includes a brine tank, circulation pump, freezing piping, and control valves, delivering low-temperature brine to the freezing pipes. However, in the refrigerant circulation process, the refrigerant flows through pipes to the freezing pipes. Although the outer walls of the pipes are covered with insulation or made of materials with poor thermal conductivity, the large temperature difference between the outside temperature and the refrigerant inevitably causes the refrigerant to absorb some external heat, reducing the actual freezing effect. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a freezing coolant circulation device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A freezing coolant circulation device, comprising:

[0008] A brine storage tank is used to store circulating brine, and a mounting connecting cylinder is fixedly connected to one side of the brine storage tank.

[0009] A refrigerant return pipe is fixedly installed at the end of the mounting connecting cylinder, and a return connection pipe is fixedly installed at the top of one end of the pipe. A freezing return pipe is fixedly connected to one end of the return connection pipe, and a freezing flow pipe is fixedly connected to the outer wall of the freezing return pipe. The freezing flow pipe and the freezing return pipe constitute a freezing pipe.

[0010] A brine injection pipe is installed inside the refrigerant return pipe, and one end is fixedly connected to multiple outlet connection pipes. The outlet connection pipes pass through the refrigerant return pipe and extend outward. An insulated connection hose is fixedly installed at the extended end. A freezing connection nozzle is fixedly installed at one end of the insulated connection hose. Multiple freezing connection nozzles are fixedly connected to the end of the refrigerant return pipe.

[0011] As a further embodiment of this utility model: a heat-insulating sleeve is fixedly sleeved on the outer wall of the brine injection pipe, and a protective sleeve is fixedly sleeved on the outer wall of the heat-insulating sleeve.

[0012] As a further embodiment of this utility model: a refrigerant supply pipe is fixedly installed at the other end of the brine injection pipe, the top of the refrigerant supply pipe penetrates the top of the brine storage tank and extends upward, and a control valve is fixedly installed at the top of its extended end.

[0013] As a further embodiment of this utility model: a brine supply pump is fixedly installed at one end of the top of the brine storage tank, a supply connection pipe is fixedly installed at the outlet of the brine supply pump, and one end of the supply connection pipe is fixedly installed at the top of the control valve.

[0014] As a further improvement of this utility model: a low-temperature brine extraction pipe is fixedly installed at the inlet of the brine supply pump, and an evaporator is fixedly installed at one end of the low-temperature brine extraction pipe.

[0015] As a further improvement of this utility model: a high-temperature brine extraction pipe is fixedly installed on one side bottom of the brine storage tank, and a brine extraction pump is fixedly installed at one end of the high-temperature brine extraction pipe.

[0016] As a further improvement of this utility model: a brine supply pipe is fixedly installed at the outlet of the brine extraction pump, and one end of the brine supply pipe is fixedly connected to the evaporator.

[0017] Compared with the prior art, the present invention provides a freezing coolant circulation device, which has the following beneficial effects:

[0018] 1. This freezing coolant circulation device encloses the low-temperature brine injection pipe inside the high-temperature brine return pipe. The high-temperature return brine forms a "thermal shielding layer" that prevents heat from the external environment from being transferred inward, significantly reducing the heat exchange loss of the low-temperature brine. The nested structure ensures that the low-temperature pipe only contacts the -20°C return brine, significantly reducing the effective heat transfer temperature difference, reducing cold loss, and ensuring the actual freezing effect of the refrigerant.

[0019] 2. This freezing coolant circulation device, through its innovative triple design of nested pipe thermal shielding, double-pipe active insulation, and short-path insulation, fundamentally solves the long-standing problem of refrigerant heat loss in artificial freezing methods. Compared with traditional insulation material solutions, its advantages are: physically reconstructing the heat transfer path, utilizing high-temperature brine within the system as a "thermal barrier" for low-temperature pipes; multi-layer protection ensuring insulation durability and avoiding performance degradation caused by corrosion; and full-process temperature control ensuring that low-temperature brine is injected into the freezing pipe at near-initial temperature, significantly improving freezing efficiency and project quality.

[0020] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the overall assembly of this utility model;

[0022] Figure 2 This is a partial cross-sectional view of the overall assembly of this utility model.

[0023] Figure 3 This utility model Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0024] Figure 4 This utility model Figure 2 A magnified schematic diagram of the structure at point B in the middle.

[0025] In the diagram: 1. Brine storage tank; 2. Installation connecting sleeve; 3. Refrigerant return pipe; 4. Return connection pipe; 5. Freeze return pipe; 6. Freeze flow pipe; 7. Refrigerant supply pipe; 8. Control valve; 9. Supply connection pipe; 10. Brine supply pump; 11. Low-temperature brine extraction pipe; 12. Evaporator; 13. Brine supply pipe; 14. Brine extraction pump; 15. High-temperature brine extraction pipe; 16. Brine injection pipe; 17. Insulation sleeve; 18. Protective sleeve; 19. Outlet connection pipe; 20. Insulated connection hose; 21. Freeze connection nozzle. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] A freezing coolant circulation device, such as Figures 1 to 4 As shown, it includes: a brine storage tank 1 for storing circulating brine, a refrigerant return pipe 3 for collecting the return of high-temperature brine, and a brine injection pipe 16 for supplying low-temperature brine to the freezing pipe.

[0028] A brine supply pump 10 is fixedly installed at one end of the top of the brine storage tank 1. A supply connection pipe 9 is fixedly installed at the outlet of the brine supply pump 10. The supply connection pipe 9 is set as an inverted U-shape. A control valve 8 is fixedly installed at the bottom of the other end of the supply connection pipe 9. A refrigerant supply pipe 7 is fixedly installed at the bottom of the control valve 8.

[0029] The bottom end of the refrigerant supply pipe 7 passes through the top of the brine storage tank 1 and is inserted into the interior of the brine storage tank 1. The end of the refrigerant supply pipe 7 inserted into the brine storage tank 1 is bent away from the end of the brine supply pump 10.

[0030] A low-temperature brine extraction pipe 11 is fixedly installed at the inlet of the brine supply pump 10. An evaporator 12 is fixedly installed at one end of the low-temperature brine extraction pipe 11. The evaporator 12 uses the evaporation of liquid ammonia to rapidly cool the brine flowing through the evaporator 12.

[0031] Evaporator 12 is a key component of refrigerant cycle (ammonia cycle) and brine cycle (refrigerant cycle). The refrigerant cycle can refer to existing refrigeration station technology, which will not be elaborated here. The main point of this application is the brine cycle, and evaporator 12 is the component for cooling brine.

[0032] A high-temperature brine extraction pipe 15 is fixedly installed at the bottom of the brine storage tank 1 near the brine supply pump 10. One end of the high-temperature brine extraction pipe 15 is inserted into the brine storage tank 1 for extracting high-temperature brine (-20°C brine, which flows back from the freezing pipe to the brine storage tank 1). A brine extraction pump 14 is fixedly installed at one end of the high-temperature brine extraction pipe 15.

[0033] A brine supply pipe 13 is fixedly installed at the outlet of the brine pump 14. One end of the brine supply pipe 13 is fixedly connected to the evaporator 12. The brine pump 14 continuously supplies high-temperature brine into the evaporator 12. After being heated by the liquid ammonia inside the evaporator 12, it becomes low-temperature brine (-30°C brine, brine injected into the freezing pipe).

[0034] A mounting connecting cylinder 2 is fixedly connected to one side of the brine storage tank 1. A refrigerant return pipe 3 is fixedly installed at the end of the mounting connecting cylinder 2. A return connecting pipe 4 is fixedly installed at the top of the end of the refrigerant return pipe 3 away from the brine storage tank 1. A freezing return pipe 5 is fixedly connected to one end of the return connecting pipe 4. A freezing flow pipe 6 is fixedly connected to the outer wall of the freezing return pipe 5. The freezing flow pipe 6 and the freezing return pipe 5 constitute a freezing pipe. The freezing pipe enters and exits the soil layer. By utilizing the flow of low-temperature brine, it absorbs the heat of the soil, causing the soil moisture to freeze and form a frozen soil wall.

[0035] The brine injection pipe 16 is fixedly installed at the end of the bend of the refrigerant supply pipe 7 and is located inside the refrigerant return pipe 3; the outer wall of the brine injection pipe 16 is fixedly sleeved with a heat insulation sleeve 17, and the outer wall of the heat insulation sleeve 17 is fixedly sleeved with a protective sleeve 18; the heat insulation sleeve 17 is used to reduce the heat exchange between the low temperature brine and the high temperature brine, and the protective sleeve 18 is used to reduce the corrosion of the heat insulation sleeve 17 by the brine.

[0036] Multiple outlet connecting pipes 19 are fixedly connected to the end of the brine injection pipe 16 away from the refrigerant supply pipe 7. The outlet connecting pipe 19 passes through the insulation sleeve 17, the protective sleeve 18 and the refrigerant return pipe 3 and extends outward. An insulated connecting hose 20 is fixedly installed at the extended end. A freezing connector 21 is fixedly installed at one end of the insulated connecting hose 20. Multiple freezing connectors 21 are fixedly connected to the end of the refrigerant return pipe 3. The length of the insulated connecting hose 20 is relatively small, and the amount of heat exchange between the low-temperature brine and the external environment is relatively small.

[0037] Working principle:

[0038] Please refer to Figures 1 to 4 Assemble the device as shown in the figure;

[0039] When this device is in use, the brine extraction pump 14 first extracts high-temperature brine from the brine storage tank 1 through the brine supply pipe 13, and then supplies it to the evaporator 12. The liquid ammonia inside the evaporator 12 evaporates, absorbing the heat of the high-temperature brine and outputting low-temperature brine. The brine supply pump 10 extracts low-temperature brine and inputs it into the brine injection pipe 16 through the refrigerant supply pipe 7. Then, the low-temperature brine is injected into the freezing flow pipe 6 through the outlet connection pipe 19, the heat-insulating connection hose 20 and the freezing connection nozzle 21. The brine that absorbs the heat of the soil flows back to the refrigerant return pipe 3 through the freezing return pipe 5 and the return connection pipe 4, and finally flows back to the brine storage tank 1.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A frozen coolant circulating device characterized by comprising: include: A brine storage tank (1) is used to store circulating brine, and a mounting connecting cylinder (2) is fixedly connected to one side of the brine storage tank (1); A refrigerant return pipe (3) is fixedly installed at the end of the mounting connecting cylinder (2), and a return connecting pipe (4) is fixedly installed at the top of one end of the pipe. A freezing return pipe (5) is fixedly connected to one end of the return connecting pipe (4), and a freezing flow pipe (6) is fixedly connected to the outer wall of the freezing return pipe (5). The freezing flow pipe (6) and the freezing return pipe (5) constitute a freezing pipe. A brine injection pipe (16) is installed inside the refrigerant return pipe (3), and one end is fixedly connected to multiple outlet connection pipes (19). The outlet connection pipe (19) passes through the refrigerant return pipe (3) and extends outward. An insulated connection hose (20) is fixedly installed at the extended end. A freezing connection nozzle (21) is fixedly installed at one end of the insulated connection hose (20). Multiple freezing connection nozzles (21) are fixedly connected to the end of the refrigerant return pipe (3).

2. A freeze cooling liquid circulating device according to claim 1, characterized in that: The outer wall of the brine injection pipe (16) is fixedly fitted with a heat insulation sleeve (17), and the outer wall of the heat insulation sleeve (17) is fixedly fitted with a protective sleeve (18).

3. A freeze cooling liquid circulating device according to claim 1, characterized in that: A refrigerant supply pipe (7) is fixedly installed at the other end of the brine injection pipe (16). The top of the refrigerant supply pipe (7) passes through the top of the brine storage tank (1) and extends upward. A control valve (8) is fixedly installed at the top of its extension end.

4. The frozen coolant circulating device according to claim 1, characterized by: A brine supply pump (10) is fixedly installed at one end of the top of the brine storage tank (1), and a supply connection pipe (9) is fixedly installed at the outlet of the brine supply pump (10). One end of the supply connection pipe (9) is fixedly installed at the top of the control valve (8).

5. A freeze cooling liquid circulating device according to claim 4, wherein: The inlet of the brine supply pump (10) is fixedly equipped with a low-temperature brine extraction pipe (11), and an evaporator (12) is fixedly installed at one end of the low-temperature brine extraction pipe (11).

6. A freeze cooling liquid circulating device according to claim 1, wherein: A high-temperature brine extraction pipe (15) is fixedly installed on one side of the bottom of the brine storage tank (1), and a brine extraction pump (14) is fixedly installed at one end of the high-temperature brine extraction pipe (15).

7. A freeze cooling liquid circulating device according to claim 6, wherein: The outlet of the brine pump (14) is fixedly equipped with a brine supply pipe (13), one end of which is fixedly connected to the evaporator (12).

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