Long spiral freezer

Abstract

The utility model relates to the technical field of stratum freezing, and discloses a long spiral freezer which comprises a pipe body, a plurality of liquid supply pipes and first partition plates, a second partition plate is arranged at the top of the pipe body, a collecting pipe is arranged on the second partition plate, a spiral blade is arranged on the outer side of the pipe body, a cavity communicated with the pipe body is arranged in the spiral blade, and the pipe body is divided into a plurality of freezing sections by the first partition plates. Every two adjacent freezing sections are communicated through a cavity, and the output ends of the liquid supply pipes are located in the different freezing sections respectively. Under the cooperation of the spiral blade and the pipe body, drilling and hole forming can be directly carried out, and hole forming in advance is not needed; according to the long spiral freezer, the spiral blade is arranged in the pipe body, and the cavity communicated with the pipe body is formed in the spiral blade, so that low-temperature gas in the pipe body can enter the cavity of the spiral blade, the contact area between the pipe body and the stratum is increased through the arrangement of the spiral blade, and the freezing speed is increased; the pipe body is divided into a plurality of freezing sections through the first partition plates, and the freezing sections are matched with the liquid supply pipe to achieve segmented freezing.

Description

Technical Field

[0001] The utility model relates to the technical field of ground freezing, in particular to a long spiral freezer. Background Art

[0002] Ground freezing is a technology that reinforces the ground by freezing rock and soil. This technology uses artificial refrigeration to freeze water in the ground, turning the natural rock and soil into frozen soil, thereby increasing its strength and stability and isolating groundwater from underground projects. This method has been widely used in municipal engineering (such as subway construction), coal mining, and deep foundation pits. In urban subway projects, it is often used in tunnel construction, shield tunneling machine entry and exit, and shield cutterhead opening and cutting.

[0003] CN102979083A discloses a liquid nitrogen freezer, comprising an exhaust pipe, a liquid inlet, an exhaust port, a sealing plate, a liquid supply pipe, a through hole, a liquid supply pipe, and a bottom plate. The liquid supply pipe and the exhaust pipe are arranged in the liquid supply pipe via the sealing plate. The exhaust pipe is provided with an exhaust port, which is arranged outside the liquid supply pipe. One end of the liquid supply pipe is provided with a bottom plate within the liquid supply pipe, and the other end passes through the sealing plate and is provided with a liquid inlet. The liquid supply pipe is evenly distributed with through holes. The through holes are flat and rectangular.

[0004] The above technical solution achieves uniform freezing by evenly distributing through-holes on the liquid supply pipe. The through-holes are arranged in a flat rectangular shape, increasing the contact area between the liquid nitrogen and the outside air, improving the freezing speed and effect. However, using the above liquid supply pipe still requires pre-drilling a hole in the formation and then burying the freezer in the hole, which is very time-consuming and labor-intensive. Utility Model Content

[0005] The purpose of this application is to solve the above-mentioned problems and provide a long spiral freezer. With the cooperation of the spiral blade and the tube body, this long spiral freezer can directly drill into a hole without the need for pre-drilling; and a cavity connected to the tube body is provided in the spiral blade so that the low-temperature gas in the tube body can enter the cavity of the spiral blade. The setting of the spiral blade increases the contact area between the tube body and the formation, thereby improving the freezing speed. At the same time, this long spiral freezer is provided with multiple first partitions in the tube body, and the tube body is separated into multiple freezing sections by the first partitions, which cooperate with the liquid supply pipe to realize segmented freezing.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] A long spiral freezer includes a tube body with a closed bottom end, multiple liquid supply pipes located in the tube body, a first partition, a second partition provided on the top of the tube body, a collection pipe provided on the second partition, spiral leaves provided on the outside of the tube body, a cavity connected to the tube body provided in the spiral leaves, at least two first partitions, and the first partition and the second partition separate the tube body into multiple freezing sections, adjacent freezing sections are connected through the cavity, and the output ends of the multiple liquid supply pipes are respectively located in different freezing sections.

[0008] Preferably, the first partition includes a horizontally arranged first plate body and a second plate body connected to the first plate body, the second plate body is arranged around the edge of the first plate body, the first plate body separates the tube body into multiple freezing sections, and the second plate body is used to close the side of the partial cavity located in the freezing section to block the communication between the tube body and the partial cavity.

[0009] Preferably, the height of the second plate is 4 / 5 to 9 / 10 of the height of the freezing section.

[0010] Preferably, the first plate body is made of a heat-insulating material.

[0011] Preferably, there are two first partitions, which separate the tube body into three freezing sections, and there are three liquid supply pipes.

[0012] Preferably, there are two second baffles, both of which are connected to the tube body and located above the first baffle. A collecting section is formed between the two second baffles, and the highest point of the spiral blade is located in the collecting section.

[0013] Preferably, the bottom end of the liquid supply tube is closed, and a plurality of output holes are provided on the side wall of the liquid supply tube near the bottom end, and the plurality of output holes form the output end of the liquid supply tube.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] With the cooperation of the spiral blade and the tube body, this long spiral freezer can directly drill into a hole without the need for pre-drilling; and a cavity connected to the tube body is provided in the spiral blade so that the low-temperature gas in the tube body can enter the cavity of the spiral blade. The provision of the spiral blade increases the contact area between the tube body and the formation, thereby improving the freezing speed. At the same time, this long spiral freezer is provided with multiple first partitions in the tube body, and the tube body is separated into multiple freezing sections by the first partitions, which cooperate with the liquid supply pipe to realize segmented freezing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic structural diagram of a long spiral freezer according to Example 1 of the present application;

[0017] Figure 2 yes Figure 1 CC cross-sectional view;

[0018] Figure 3 yes Figure 1 DD cross-sectional view;

[0019] Figure 4 is a perspective view of a long spiral freezer according to Example 1 of the present application;

[0020] The reference numerals are as follows:

[0021] Tube body 1; liquid supply pipe 2; first partition plate 3; second partition plate 11; spiral blade 12; output hole 21; first plate body 31; second plate body 32; collection tube 111; cavity 121; freezing section A; collection section B. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1

[0024] refer to Figures 1 to 4 A long spiral freezer includes a tube body 1 with a closed bottom end, multiple liquid supply pipes 2 located in the tube body 1, and a first partition 3. A second partition 11 is provided on the top of the tube body 1, and a collecting pipe 111 is provided on the second partition 11. A spiral leaf 12 is provided on the outside of the tube body 1, and a cavity 121 connected to the tube body 1 is provided in the spiral leaf 12. There are at least two first partitions 3, and the first partition 3 and the second partition 11 separate the tube body 1 into multiple freezing sections A. Adjacent freezing sections A are connected through the cavity 121, and the output ends of the multiple liquid supply pipes 2 are respectively located in different freezing sections A.

[0025] Under this design, the operator operates the long spiral drill to drill the long spiral freezer directly into the hole, and then separates the long spiral drill from the long spiral freezer and operates the long spiral drill to leave the current area;

[0026] Connect the external liquid nitrogen delivery equipment to the multiple liquid supply pipes 2, and introduce liquid nitrogen into the liquid supply pipes 2. Under the guidance of the liquid supply pipes 2, the liquid nitrogen flows to different freezing sections A respectively, and enters the pipe body 1 from the corresponding freezing sections A. Finally, it exists in the pipe body 1 in the form of low-temperature nitrogen. It freezes the soil through the pipe body and spiral blades, and the low-temperature nitrogen in the pipe body 1 will continue to rise;

[0027] Under the action of the first partition 3, the speed at which the low-temperature nitrogen leaves the corresponding freezing section A is limited, so that the low-temperature nitrogen can enter the cavity 121 of the freezing section A, so that the spiral blades 12 also have freezing ability. The spiral blades 12 increase the contact area with the soil layer and improve the freezing speed.

[0028] Of course, after freezing with liquid nitrogen for a period of time, the operator can also connect the liquid supply pipe 2 to an external brine delivery device. Considering the high cost of liquid nitrogen, using liquid nitrogen during the active freezing phase can achieve a faster freezing effect. After the active freezing phase, the maintenance freezing phase begins, during which brine is used for maintenance freezing, which can ensure the freezing effect while reducing costs. In addition, the operator can connect the collection pipe 111 to an external collection device to collect the rising low-temperature liquid nitrogen or brine.

[0029] Preferably, the first partition 3 includes a horizontally arranged first plate body 31 and a second plate body 32 connected to the first plate body 31. The second plate body 32 is arranged around the edge of the first plate body 31. The first plate body 31 separates the tube body 1 into multiple freezing sections A. The second plate body 32 is used to close the side of the partial cavity 121 located in the freezing section A.

[0030] Specifically, the purpose of using the second plate 32 to seal the side of part of the cavity 121 located in the freezing section A is to allow the nitrogen to be discharged along the cavity 121 of the spiral blade 12, allowing the low-temperature nitrogen to continue to freeze the rock and soil. Simply put, when the low-temperature nitrogen rises, the first plate 31 prevents the freezing section A located in the lower layer from directly entering the freezing section A in the upper layer from the tube body 1, so the low-temperature nitrogen will enter the cavity 121 of the spiral blade 12. Under the obstruction of the second plate 32, the low-temperature nitrogen can only move along the cavity 121 around the outside of the second plate 32. Because the second plate 32 only seals part of the cavity 121, when the low-temperature nitrogen ascends to the unsealed cavity 121 area, some of the nitrogen will enter the upper freezing section A and continue to rise after mixing with the low-temperature nitrogen in the upper freezing section A.

[0031] Furthermore, the height of the second plate 32 is 4 / 5 to 9 / 10 of the height of the freezing section A. In practical applications, the height of the second plate 32 can be 4 / 5 or 9 / 10 of the height of the freezing section A. The purpose is to seal the sides of more cavities 121 in the freezing section A to allow the low-temperature nitrogen to flow in the cavities 121, thereby ensuring the freezing effect of the spiral blades 12.

[0032] Preferably, the first plate 31 is made of a heat-insulating material. Considering that each freezing segment A can be independent of each other, the first plate 31 is made of a heat-insulating material, which can avoid heat transfer between adjacent freezing segments A to a certain extent.

[0033] In this embodiment, there are two first partitions 3, which separate the tube body 1 into three freezing sections A. There are three liquid supply pipes 2. In actual applications, the operator can increase the number of first partitions 3 and liquid supply pipes 2 based on actual conditions, but the number of freezing sections A must match the number of liquid supply pipes 2.

[0034] Preferably, there are two second baffles 11, both of which are connected to the tube body 1 and located above the first baffle 3. A collecting section B is formed between the two second baffles 11, and the highest point of the spiral blade 12 is located in the collecting section B.

[0035] Specifically, the collection section B is used to store the low-temperature nitrogen or brine that rises to the top of the pipe body 1, and collects and processes it through the collection pipe 111 and external collection equipment for secondary use. In addition, the second partition 11 is also made of a heat-insulating material.

[0036] Furthermore, the bottom end of the liquid supply pipe 2 is sealed, and a plurality of output holes 21 are provided on the side wall of the liquid supply pipe 2 near the bottom end. The plurality of output holes 21 form the output end of the liquid supply pipe 2. The use of the liquid supply pipe 2 with a sealed bottom end ensures uniform output of low-temperature nitrogen from the output end, and the heat exchange between the low-temperature nitrogen and the external soil ensures uniform freezing.

[0037] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A long spiral freezer, comprising a tube body with a closed bottom end, a plurality of liquid supply pipes located in the tube body, a first partition, a second partition provided on the top of the tube body, and a collection pipe provided on the second partition, characterized in that: The outer side of the tube body is provided with a spiral leaf, and a cavity connected to the tube body is provided inside the spiral leaf. There are at least two first partitions, and the first partitions separate the tube body into multiple freezing sections. Two adjacent freezing sections are connected through the cavity, and the output ends of multiple liquid supply pipes are respectively located in different freezing sections.

2. The long spiral freezer according to claim 1, characterized in that The first partition includes a horizontally arranged first plate body and a second plate body connected to the first plate body, the second plate body is arranged around the edge of the first plate body, the first plate body separates the tube body into multiple freezing sections, and the second plate body is used to close the side of the partial cavity located in the freezing section to block the communication between the tube body and the partial cavity.

3. The long spiral freezer according to claim 2, characterized in that The height of the second plate is 4 / 5 to 9 / 10 of the height of the freezing section.

4. The long spiral freezer according to claim 2, characterized in that The first plate is made of a heat-insulating material.

5. The long spiral freezer according to claim 1, characterized in that There are two first partitions, which separate the tube body into three freezing sections. There are three liquid supply tubes.

6. The long spiral freezer according to claim 1, characterized in that There are two second baffles, both of which are connected to the tube body and located above the first baffle. A collecting section is formed between the two second baffles, and the highest point of the spiral blade is located in the collecting section.

7. The long spiral freezer according to claim 1, characterized in that The bottom end of the liquid supply pipe is closed, and a plurality of output holes are provided on the side wall of the liquid supply pipe near the bottom end, and the plurality of output holes form the output end of the liquid supply pipe.

Images