A freezing device with adjustable freezing length and position and its usage method

Abstract

The present invention relates to a freezing device with adjustable freezing length and position and a using method thereof. The device is composed of a freezing module and a control module; both ends of the freezing tube in the freezing module are respectively inserted into a liquid inlet pipe and a liquid outlet pipe with adjustable freezing length and position, dividing the internal space of the freezing tube into three sections: a freezing section in the middle and heat preservation sections on both sides respectively. The freezing length and position of the freezing section are adjusted by changing the depth of insertion of the liquid inlet pipe or the liquid outlet pipe into the freezing tube. The liquid inlet pipe and the liquid outlet pipe are respectively connected to a freezing station, and the heat preservation sections on both sides are respectively connected to the control module. Compared with the existing manual ground freezing device, the device of the present invention can change the length and position of the freezing section during the freezing process, realizing non-uniform thickness dynamic freezing control.

Description

Technical Field

[0001] The present invention relates to a dynamic freezing and mined - tunneling technology in urban underground space development, specifically a freezing device with adjustable freezing length and position and its usage method. Background Art

[0002] Freezing method is often used to ensure construction safety in mined - tunneling construction in water - rich strata. The safety barrier of the freezing method is the freezing curtain, which mainly has two major functions: water sealing and support. During the freezing and mined - tunneling process, the freezing curtain near the excavation face needs to independently resist most of the external ground pressure, playing a role of strong water sealing and strong support, and thus requires a larger thickness; while the freezing curtain far from the excavation face has stable unexcavated soil or completed permanent lining for support inside, only playing a role of strong water sealing and weak support, and thus requires a smaller thickness. Therefore, an ideal freezing curtain should be thick near the excavation face and thin far from the excavation face, dynamically changing with the construction progress. Developing a non - uniform - thickness dynamic freezing technology is required to form such a freezing curtain.

[0003] One of the keys to the non - uniform - thickness dynamic freezing technology is the freezing device. Its key function is to adjust the length and position of the frozen section during the freezing process. Similar device achievements mainly include:

[0004] 1. "A freezer capable of realizing staged freezing and a staged freezing method" disclosed in the invention patent publication number CN111365001A realizes the hierarchical adjustment of the frozen section length during the freezing process. However, the length of its frozen section can only be adjusted according to fixed segments, and the division of the frozen section needs to be determined before the freezing implementation and cannot be changed during the freezing process.

[0005] 2. "A hierarchically and segment - controllable freezing pipe applied to the construction of underground structures by freezing method" disclosed in the invention patent publication number CN113957876A realizes the stepless adjustment of the frozen section length. However, it can only adjust the position of one end of the frozen section, and the other end remains fixed, and it cannot independently adjust the position of the frozen section under the condition that the length of the frozen section remains unchanged. In addition, the adjustment of the frozen section length of this patent can only be implemented before freezing and cannot be adjusted during the freezing process.

[0006] Therefore, there is currently no mature and reliable freezing device that can realize real - time adjustment of the length and position of the frozen section during the freezing process, and there is an urgent need to develop a new type of technical equipment that can realize dynamic freezing control.

[0007] In summary, to achieve non - uniform - thickness dynamic freezing control, a special structural form is required. The freezing pipes are divided into a freezing zone and a heat - preservation zone with adjustable length and position, and the equipment and methods for realizing regional adjustment are described. Summary of the Invention

[0008] The object of the present invention is to provide a freezing device with adjustable freezing length and position, realizing non-uniform-thickness dynamic freezing control and promoting the development of the freezing method towards low-carbon and environmental protection.

[0009] To achieve adjustable freezing length and position, the present invention adopts the following technical solutions:

[0010] A freezing device with adjustable freezing length and position, which is composed of a freezing module and a control module; both ends of the freezing tubes in the freezing module are respectively inserted into the liquid inlet pipe and the liquid outlet pipe with adjustable freezing length and position, dividing the internal space of the freezing tubes into three sections: a freezing section in the middle and heat preservation sections on both sides. The freezing length and position of the freezing section are adjusted by changing the depth of the liquid inlet pipe or the liquid outlet pipe inserted into the freezing tubes. The liquid inlet pipe and the liquid outlet pipe are respectively connected to the freezing station, and the heat preservation sections on both sides are respectively connected to the control module.

[0011] Furthermore, the freezing module includes freezing tubes, sealed connecting pipes, cover plates, bolts, liquid inlet pipes, liquid outlet pipes, adapter joints, supply pipes, return pipes and a freezing station. The freezing tubes are slender stainless steel round tubes, with a head at one end. There is a round hole with a sealing ring on the inner wall in the center of the head. There is a sealed connecting pipe penetrating through the head on one side of the head. The other end of the freezing tube is an open structure with an enlarged outer diameter, and a sealing ring is arranged on the end face, and it is tightly connected to the cover plate through bolts; the cover plate is cylindrical, with an outer diameter the same as the outer diameter of the enlarged end face of the freezing tube, and a round hole is opened in the center, and there is a sealed connecting pipe penetrating through on one side.

[0012] Furthermore, the liquid inlet pipe is a stainless steel round tube with a large-diameter piston structure at one end. The piston is located inside the freezing tube, and a sealing ring is arranged on its outer side and contacts the inner side of the freezing tube. The round tube section passes through the round hole in the center of the cover plate, and its outer side contacts the side of the round hole in the cover plate, and part of the round tube is located inside the freezing tube, and the rest is located outside the freezing tube; the structural shape of the liquid outlet pipe is the same as that of the liquid inlet pipe, and the installation position is similar to that of the liquid inlet pipe. Its round tube section passes through the round hole at the head end of the freezing tube, and its outer side contacts the side of the round hole; the round tube sections of the liquid inlet pipe and the liquid outlet pipe are respectively connected to one end of the supply pipe and the return pipe through adapter joints; the other ends of the supply pipe and the return pipe are connected to the freezing station.

[0013] Furthermore, the control module is composed of a grease pump at the liquid inlet end, a grease pump at the liquid outlet end, an oil supply valve, an oil return valve and a three-way joint. Among them, the grease pump at the liquid inlet end and the grease pump at the liquid outlet end are respectively connected to one end of the three-way joint through a hose installed with an oil supply valve. The other end of the three-way joint is connected to their respective grease storage tanks through a pipeline installed with an oil return valve. The last end of the three-way joint is connected to the sealed connecting pipe installed on the outer end face of the cover plate through a pipeline.

[0014] A method for using a freezing device with adjustable freezing length and position. During use, in the freezing section, the refrigerant is circulated through the freezing station to cool the circumferential space of the freezing pipe for freezing. In the insulation section, insulating grease is filled by a grease pump to prevent heat exchange between the freezing pipes in this section and the surrounding space. The length and position of the freezing section are adjusted by changing the depth of the liquid inlet pipe or the liquid outlet pipe inserted into the freezing pipe.

[0015] Furthermore, the method for increasing the depth of the liquid inlet pipe or the liquid outlet pipe inserted into the freezing pipe is as follows: Open the oil supply valve and close the oil return valve. Use the grease pump to inject insulating grease into the space of the freezing pipe, and push the liquid inlet pipe or the liquid outlet pipe to move in the direction of inserting into the freezing pipe.

[0016] Furthermore, the method for decreasing the depth of the liquid inlet pipe or the liquid outlet pipe inserted into the freezing pipe is as follows: Close the oil supply valve and open the oil return valve. Use manual or mechanical means to pull it outward, so that the liquid inlet pipe or the liquid outlet pipe moves outward from the freezing pipe. At this time, the insulating grease is squeezed out of the freezing pipe and flows into the storage tank of the grease pump through a hose.

[0017] The beneficial effects of the present invention are:

[0018] Compared with the existing manual ground freezing device, the device of the present invention can change the length and position of the freezing section during the freezing process, and realize non-uniform thickness dynamic freezing control. Description of the Drawings

[0019] Figure 1 is a schematic diagram of the freezing device with adjustable freezing length and position of the present invention;

[0020] In the figure: 1: Freezing pipe, 2: Sealed connecting pipe, 3: Cover plate, 4: Bolt, 5: Liquid inlet pipe, 6: Liquid outlet pipe, 7: Adapter, 8: Liquid supply pipe, 9: Liquid return pipe, 10: Freezing station, 11: Grease pump at the liquid inlet end, 12: Grease pump at the liquid outlet end, 13: Oil supply valve, 14: Oil return valve, 15: Three-way joint. Detailed Embodiments

[0021] The present invention will be further described below in conjunction with the drawings and embodiments.

[0022] As Figure 1 shown, a freezing device with adjustable freezing length and position, the whole device consists of a freezing module and a control module.

[0023] The freezing module consists of a freezing pipe 1, a sealed connecting pipe 2, a cover plate 3, bolts 4, a liquid inlet pipe 5, a liquid outlet pipe 6, a conversion joint 7, a liquid supply pipe 8, a liquid return pipe 9, and a freezing station 10. Among them, the freezing pipe 1 is a slender stainless-steel round pipe with a head at one end. There is a round hole with a sealing ring on the inner wall at the center of the head. On one side of the head, there is a sealed connecting pipe 2 passing through the head. The other end of the freezing pipe 1 is an open structure with an enlarged outer diameter, and a sealing ring is provided on the end face. It is tightly connected to the cover plate 3 through bolts 4; the cover plate 3 is cylindrical, with an outer diameter the same as that of the enlarged end face of the freezing pipe 1. There is a round hole at the center, and a sealed connecting pipe 2 passes through on one side; the liquid inlet pipe 5 is a stainless-steel round pipe with a large-diameter piston structure at one end. The piston is located inside the freezing pipe 1, and a sealing ring is provided on its outer side surface and contacts the inner side surface of the freezing pipe 1. The round pipe section passes through the round hole at the center of the cover plate 3, and its outer side surface contacts the side surface of the round hole of the cover plate. And the round pipe part is located inside the freezing pipe 1, and the rest is located outside the freezing pipe 1; the structural shape of the liquid outlet pipe 6 is the same as that of the liquid inlet pipe 5, and the installation position is also similar to that of the liquid inlet pipe. Its round pipe section passes through the round hole at the head end of the freezing pipe, and its outer side surface contacts the side surface of the round hole; the round pipe sections of the liquid inlet pipe 5 and the liquid outlet pipe 6 are respectively connected to one end of the liquid supply pipe 8 and the liquid return pipe 9 through the conversion joint 7; the other ends of the liquid supply pipe 8 and the liquid return pipe 9 are connected to the freezing station 10.

[0024] The control module consists of a grease pump 11 at the liquid inlet end, a grease pump 12 at the liquid outlet end, an oil supply valve 13, an oil return valve 14, and a tee 15. Among them, the grease pump 11 at the liquid inlet end is connected to one end of the tee 15 through a hose installed with the oil supply valve 13. The other end of the tee 15 is connected to the grease storage tank of the grease pump 11 at the liquid inlet end through a pipeline installed with the oil return valve 14. The last end of the tee 15 is connected to the sealed connecting pipe 2 installed on the outer end face of the cover plate 3 through a pipeline; the grease pump 12 at the liquid outlet end is connected to one end of the tee through a hose installed with the oil supply valve 13. The other end of the tee is connected to the grease storage tank of the grease pump 12 at the liquid outlet end through a pipeline installed with the oil return valve 14. The last end of the tee 15 is connected to the sealed connecting pipe installed at the head end of the freezing pipe through a pipeline.

[0025] This device divides the internal space of the freezing pipe into three sections by using the liquid inlet pipe and the liquid outlet pipe with special structures: the freezing section Ⅰ in the middle and the heat preservation sections Ⅱ and Ⅲ on both sides respectively.

[0026] During use, the freezing section cools and freezes the circumferential space of the freezing pipe by circulating the refrigerant through the freezing station. In the heat preservation sections, insulating grease is filled through the grease pump to prevent heat exchange between the freezing pipe in this section and the surrounding space. The length and position of the freezing section are adjusted by changing the depth of the liquid inlet pipe or the liquid outlet pipe inserted into the freezing pipe.

[0027] The method for increasing the insertion depth is as follows: open the oil supply valve, close the oil return valve, inject insulating grease into the freezing pipe space by using a grease pump, and push the liquid inlet pipe or the liquid outlet pipe to move in the direction of inserting into the freezing pipe.

[0028] The method for decreasing the insertion depth is as follows: close the oil supply valve, open the oil return valve, pull outward manually or mechanically, so that the liquid inlet pipe or the liquid outlet pipe moves to the outside of the freezing pipe. At this time, the insulating grease is extruded from the freezing pipe and flows into the storage tank of the grease pump through the hose.

Claims

1. A freezing device with adjustable freezing length and position, characterized in that: It consists of a freezing module and a control module; both ends of the freezing tubes in the freezing module are respectively inserted into the liquid inlet pipe and the liquid outlet pipe with adjustable freezing length and position, dividing the internal space of the freezing tubes into three sections: a freezing section in the middle and heat preservation sections on both sides. The freezing length and position of the freezing section are adjusted by changing the depth of insertion of the liquid inlet pipe or the liquid outlet pipe into the freezing tubes; the liquid inlet pipe and the liquid outlet pipe are respectively connected to the freezing station, and the heat preservation sections on both sides are respectively connected to the control module; the freezing module includes freezing tubes, sealed connecting pipes, cover plates, bolts, liquid inlet pipes, liquid outlet pipes, adapter joints, supply pipes, return pipes and a freezing station. The freezing tubes are slender stainless steel round tubes, with a head at one end, and a round hole with a sealing ring on the inner wall is provided at the center of the head. A sealed connecting pipe passing through the head is provided on one side of the head. The other end of the freezing tube is an open structure with an enlarged outer diameter, and a sealing ring is provided on the end face, and it is tightly connected to the cover plate through bolts; the cover plate is cylindrical, with an outer diameter the same as that of the enlarged end face of the freezing tube, a round hole is opened at the center, and a sealed connecting pipe passing through is provided on one side; the liquid inlet pipe is a stainless steel round tube with a large-diameter piston structure at one end. The piston is located inside the freezing tube, and a sealing ring is provided on its outer side and contacts the inner side of the freezing tube. The round tube section passes through the round hole at the center of the cover plate, and its outer side contacts the side of the round hole of the cover plate, and part of the round tube is inside the freezing tube and the rest is outside the freezing tube; the structural shape of the liquid outlet pipe is the same as that of the liquid inlet pipe, and the installation position is similar to that of the liquid inlet pipe. Its round tube section passes through the round hole at the head end of the freezing tube, and its outer side contacts the side of the round hole; the round tube sections of the liquid inlet pipe and the liquid outlet pipe are respectively connected to one end of the supply pipe and the return pipe through adapter joints; the other ends of the supply pipe and the return pipe are connected to the freezing station; the control module consists of an oil pump at the liquid inlet end, an oil pump at the liquid outlet end, an oil supply valve, an oil return valve and a tee. Among them, the oil pump at the liquid inlet end and the oil pump at the liquid outlet end are respectively connected to one end of the tee through a hose installed with an oil supply valve. The other end of the tee is connected to its respective grease storage tank through a pipeline installed with an oil return valve. The last end of the tee is connected to the sealed connecting pipe installed on the outer end face of the cover plate through a pipeline.

2. A method for using a freezing device with adjustable freezing length and position as described in claim 1, characterized in that: During use, the freezing section cools and freezes the circumferential space of the freezing tubes through the circulation of the refrigerant in the freezing station, and the heat preservation sections are filled with insulating grease by the grease pumps to prevent heat exchange between the freezing tubes in the freezing section and the surrounding space; the length and position of the freezing section are adjusted by changing the depth of insertion of the liquid inlet pipe or the liquid outlet pipe into the freezing tubes.

3. The usage method according to claim 2, characterized in that: The method for increasing the depth of insertion of the liquid inlet pipe or the liquid outlet pipe into the freezing tubes is: open the oil supply valve, close the oil return valve, and use the grease pump to inject insulating grease into the space of the freezing tubes to push the liquid inlet pipe or the liquid outlet pipe to move in the direction of inserting into the freezing tubes.

4. The usage method according to claim 2, characterized in that: The method for reducing the depth of insertion of the liquid inlet pipe or the liquid outlet pipe into the freezing tubes is: close the oil supply valve, open the oil return valve, and use manual or mechanical means to pull it outward to make the liquid inlet pipe or the liquid outlet pipe move to the outside of the freezing tubes. At this time, the insulating grease is squeezed out of the freezing tubes and flows into the storage tank of the grease pump through the hose.

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