Spiral pipe coiling equipment and method for thin-wall capillary pipe

Abstract

The invention relates to the technical field of heat exchangers, and provides a spiral pipe coiling device and method for a thin-wall capillary pipe, and the spiral pipe coiling device comprises a rotating shaft which can rotate around the axis of the rotating shaft; the capillary disc is arranged on one side of the rotating shaft, the free end of the capillary disc is fixed to the outer side wall of the rotating shaft, the capillary disc can move in the first direction when the rotating shaft rotates so that a capillary can be spirally wound around the rotating shaft, the capillary is filled with water, and the first direction is the same as the axial direction of the rotating shaft; the liquid nitrogen spraying pipe is movably arranged on the outer side of the rotating shaft in the first direction, a spraying opening of the liquid nitrogen spraying pipe faces the rotating shaft, and the liquid nitrogen spraying pipe is used for spraying liquid nitrogen to the capillary tube wound around the rotating shaft so that water in the capillary tube can be condensed into ice; stress bending deformation in the spiral process of the thin-wall capillary tube is prevented, and stable automatic spiral pipe coiling is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a spiral coil device and method for thin-wall capillary tubes. Background Art

[0002] Capillary spiral coil heat exchanger is a common technology in the field of dilution refrigerator heat exchangers and other heat exchangers. It uses the unique properties of capillaries to improve heat exchange efficiency. By bending the capillary into a spiral shape, the capillary length and heat exchange area are increased in a limited space.

[0003] The current coil process has major defects. It usually directly adopts bending and other methods, which can easily cause stress deformation of the capillary, resulting in wrinkles and ruptures of the capillary, seriously affecting its use. Especially when the spiral diameter of the capillary spiral coil is small, it is easy to cause stress bending, deformation and even breakage during the coiling process, which seriously affects the effect of the heat exchanger. Summary of the invention

[0004] The invention provides a spiral coiling device and method for a thin-wall capillary tube, which are used to solve the problem in the prior art that the capillary tube is prone to stress deformation during the coiling process.

[0005] The present invention provides a spiral coil device for a thin-wall capillary tube, comprising: A rotation shaft, configured to be rotatable about its axis; A capillary tube disk is disposed on one side of the rotating shaft, a free end of the capillary tube disk is fixed to an outer side wall of the rotating shaft, the capillary tube disk can move along a first direction when the rotating shaft rotates so as to spirally coil the capillary tube around the rotating shaft, and the capillary tube is filled with water, and the first direction is the same as the axial direction of the rotating shaft; A liquid nitrogen nozzle is movably arranged outside the rotating shaft along the first direction, with a spray port of the liquid nitrogen nozzle facing the rotating shaft, and is used to spray liquid nitrogen to the capillary coiled on the rotating shaft to condense water in the capillary into ice.

[0006] According to the spiral coil device of thin-wall capillary provided by the present invention, the rotating shaft is provided with a cavity along the axial direction, one end of the cavity is connected to a first liquid supply pipe, and the first liquid supply pipe is used to provide liquid nitrogen to the cavity.

[0007] The spiral coil device of thin-wall capillary provided by the present invention further comprises a second liquid supply pipe, which is connected to the liquid nitrogen nozzle and is used to provide liquid nitrogen to the liquid nitrogen nozzle.

[0008] The spiral coil device of thin-wall capillary provided by the present invention further comprises a first driving mechanism, which is transmission-connected to the rotating shaft and is used to drive the rotating shaft to rotate.

[0009] The spiral coil device of thin-wall capillary tubes provided by the present invention further comprises a frame, the first driving mechanism is arranged on the frame, and both ends of the rotating shaft are rotatably connected to the frame respectively.

[0010] The spiral coil device of thin-walled capillary provided by the present invention further comprises a moving seat and a second driving mechanism, wherein the second driving mechanism can drive the moving seat to move along a first direction, and the liquid nitrogen nozzle and the capillary coil are both arranged on the moving seat.

[0011] According to the spiral coil device of thin-wall capillary provided by the present invention, a mounting frame is arranged on the movable seat, and the mounting frame is connected to the liquid nitrogen spray pipe.

[0012] According to the spiral coil device of thin-walled capillaries provided by the present invention, a positioning assembly is arranged on the movable seat, and the positioning assembly includes a clamping bolt and a clamping piece. The capillary disk is rotatably arranged in the clamping piece, and the clamping bolt abuts against the clamping piece to clamp it on the movable seat.

[0013] In a second aspect, the present invention provides a method for spirally coiling a thin-walled capillary tube, using the spirally coiling device for the thin-walled capillary tube as described in the first aspect, comprising: The free end of the capillary disk is fixed on the outer side wall of the rotating shaft, and the rotating shaft rotates, and the capillary disk moves in a first direction, so that the capillary filled with water is spirally wound on the rotating shaft; The liquid nitrogen nozzle sprays liquid nitrogen toward the capillary spirally wound on the rotating shaft to cool the capillary; After coiling, remove the rotating shaft and take out the spiral capillary.

[0014] According to the spiral coiling method of the thin-walled capillary provided by the present invention, the free end of the capillary coil is fixed on the outer wall of the rotating shaft, the rotating shaft rotates, and the capillary coil moves along the first direction, and the capillary filled with water is spirally coiled on the rotating shaft, which also includes: Liquid nitrogen is introduced into the cavity of the rotating shaft through the first liquid supply pipe to cool the rotating shaft.

[0015] The invention provides a spiral coiling device for a thin-walled capillary, comprising: a rotating shaft, a capillary coil and a liquid nitrogen spray pipe. A capillary filled with water is spirally coiled on the rotating shaft, and liquid nitrogen is sprayed on the capillary during the coiling process. The extremely strong cooling capacity of the liquid nitrogen is utilized to condense the water in the capillary into ice under the heat exchange effect of the liquid nitrogen, and the capillary is quickly cooled. The solid ice can maintain the flow channel shape of the thin-walled capillary, thereby preventing the capillary from generating stress deformation during the coiling process, especially preventing the capillary from wrinkling and rupture when the thin-walled capillary is bent, thereby realizing a stable and effective spiral coiling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of a spiral coil device of a thin-wall capillary provided in an embodiment of the present invention.

[0018] Figure 2 The present invention is a flowchart of a method for spirally coiling a thin-wall capillary provided in an embodiment of the present invention.

[0019] Reference numerals: 1. Rotating axis; 2. Capillary disk; 3. Liquid nitrogen nozzle; 4. First liquid supply pipe; 5. Second liquid supply pipe; 6. Moving seat; 7. Mounting frame; 8. Clamping bolt; 9. Slide rail; 10. Liquid nitrogen tank; 11. Rotating joint; 12. Rack. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0021] Combine the following Figure 1-Figure 2 The invention describes a spiral coiling device and method for a thin-wall capillary tube.

[0022] This embodiment provides a spiral coil device of a thin-wall capillary, comprising: a rotating shaft 1 , a capillary coil 2 and a liquid nitrogen nozzle 3 .

[0023] Among them, the rotating shaft 1 is arranged horizontally and can rotate around its axis; the capillary disk 2 is arranged on one side of the rotating shaft 1, and the free end of the capillary disk 2 is fixed on the outer side wall of the rotating shaft 1. The capillary disk 2 can move along a first direction when the rotating shaft 1 rotates, so as to spirally coil the capillary on the rotating shaft 1, and the capillary is filled with water, and the first direction is the same as the axial direction of the rotating shaft 1; the liquid nitrogen nozzle 3 is movably arranged on the outside of the rotating shaft 1 along the first direction, and the injection port of the liquid nitrogen nozzle 3 faces the rotating shaft 1, and is used to spray liquid nitrogen to the capillary coiled on the rotating shaft 1, so as to condense the water in the capillary into ice.

[0024] It can be seen from the above scheme that the present invention spirally winds a capillary filled with water on a rotating shaft 1, and sprays liquid nitrogen on the capillary during the winding process. The extremely strong cooling ability of liquid nitrogen is used to condense the water in the capillary into ice under the heat exchange effect of liquid nitrogen, and the capillary is quickly cooled. The solid ice can maintain the flow channel shape of the thin-walled capillary, thereby preventing the capillary from generating stress deformation during the coiling process, especially the capillary wrinkling and rupture that are easy to occur when the thin-walled capillary is bent, thereby achieving stable and effective spiral coiling.

[0025] Furthermore, the rotating shaft 1 is axially provided with a cavity, one end of the cavity is connected to a first liquid supply pipe 4, and the first liquid supply pipe 4 can be rotatably connected to the rotating shaft 1 through a rotating joint 11, and the first liquid supply pipe 4 is used to provide liquid nitrogen to the cavity.

[0026] In this way, by setting the rotating shaft 1 hollow and introducing liquid nitrogen into the cavity, the extremely low temperature characteristics of liquid nitrogen are utilized to ensure that the rotating shaft 1 can quickly reach the required low temperature state. The introduction of liquid nitrogen into the cavity of the rotating shaft 1, on the one hand, can cooperate with the liquid nitrogen nozzle 3 to cool the capillary tube, so that the water in the capillary tube solidifies and freezes to maintain the flow channel structure of the capillary tube, prevent the capillary tube from deforming, and improve the coiling effect; on the other hand, it can also ensure that the water in the capillary tube that has been wound around the rotating shaft 1 continues to maintain a frozen state during the movement of the liquid nitrogen nozzle 3, prevent local liquefaction, and achieve a stable spiral coiling process.

[0027] In some embodiments, a second liquid supply pipe 5 is further included, which is connected to the liquid nitrogen nozzle 3 and is used to provide liquid nitrogen to the liquid nitrogen nozzle 3, wherein the first liquid supply pipe 4 and the second liquid supply pipe 5 are both connected to the liquid nitrogen tank 10.

[0028] In this embodiment, a first driving mechanism is also included, which is connected to the rotating shaft 1 for driving the rotating shaft 1 to rotate. The first driving mechanism can be a driving motor. The driving motor and the rotating shaft 1 can be connected to each other by belt drive, chain drive, gear drive, etc. to achieve automatic rotation of the rotating shaft 1.

[0029] In some embodiments, a frame 12 is further included, a first driving mechanism is disposed on the frame 12, a rotating shaft 1 is horizontally disposed on the frame 12, and both ends of the rotating shaft 1 are rotatably connected to the frame 12 respectively, so that the capillary disk 2 is wound around the portion between the two ends of the rotating shaft 1, and the rotating shaft 1 is driven to rotate around the axis by the driving mechanism.

[0030] For example, a chuck is set at one end of the frame 12, and the chuck can be a three-jaw chuck for clamping and fixing the rotating shaft 1. The end of the rotating shaft 1 away from the chuck is rotatably connected to the frame 12 through a bearing. The driving motor drives the chuck to rotate, thereby driving the rotating shaft 1 to rotate.

[0031] In this embodiment, a moving seat 6 and a second driving mechanism are also included. The second driving mechanism can drive the moving seat 6 to move along the first direction. The liquid nitrogen nozzle 3 and the capillary disk 2 are both arranged on the moving seat 6, so that the capillary disk 2 and the liquid nitrogen nozzle 3 move synchronously. Figure 1 As shown, a mounting frame 7 is provided on the movable seat 6, and the mounting frame 7 is connected to the liquid nitrogen nozzle 3 for supporting and fixing the liquid nitrogen nozzle 3; a positioning assembly is provided on the movable seat 6, and the positioning assembly includes a clamping bolt 8 and a clamping member, and the capillary disk 2 is rotatably arranged in the clamping member, and the clamping bolt 8 abuts against the clamping member for clamping it on the movable seat 6.

[0032] With such arrangement, the degree of automation of the operation is improved through the automated movement design of the movable seat 6, the continuity and stability of the entire coiling process can be ensured, and production interruptions caused by improper manual operation can be avoided, thereby improving work efficiency. The moving speed of the movable seat 6 can be conveniently controlled by the second driving mechanism to ensure that each product is processed according to the same process parameters, thereby ensuring the consistency between products and improving the coiling quality. In addition, the pitch of the spiral capillary formed in the coiling process can be adjusted to meet the needs of different product sheets. Since the liquid nitrogen nozzle 3 moves synchronously with the capillary coil 2, the precise correspondence between the two in spatial position can be ensured, which helps to achieve a more uniform cooling effect, ensure that the capillary is heated evenly, and avoid quality problems caused by uneven cooling.

[0033] Optionally, a moving wheel is provided at the bottom of the moving seat 6, and the moving wheel is in rolling contact with the supporting surface to realize the movement of the moving seat 6 on the supporting surface; or, the moving seat 6 and the supporting surface are connected in a sliding manner, for example, a slider is provided at the bottom of the moving seat 6, and a slide rail 9 is provided on the supporting surface such as the ground along a first direction, and the sliding connection between the moving seat 6 and the supporting surface is realized through the cooperation between the slider and the slide rail 9. Of course, the slide rail 9 can also be provided on the frame 12.

[0034] The second driving mechanism can be a linear transmission method such as an electric cylinder, an air cylinder, a hydraulic cylinder, a ball screw, a synchronous belt, etc. For example, a ball screw is used, and the motor drives the screw to rotate, and the nut is connected to the movable seat 6. The rotation of the screw drives the nut to move linearly, thereby driving the movable seat 6 to move linearly along the first direction.

[0035] The embodiment of the present invention further provides a method for spirally coiling a thin-walled capillary tube, using the above-mentioned spirally coiling device for thin-walled capillary tube, comprising: Step 1: fix the free end of the capillary tube disk 2 on the outer wall of the rotating shaft 1 , rotate the rotating shaft 1 , and move the capillary tube disk 2 along a first direction, so that the capillary tube filled with water is spirally wound on the rotating shaft 1 .

[0036] In some embodiments, step 1 specifically includes: loading a rotating shaft 1 on a frame 12, driving it to rotate by a first driving mechanism, the capillary tube disk 2 is rotatably disposed on a movable seat 6, and the free end of the capillary tube disk 2 is fixed on the outer wall of the rotating shaft 1, and the movable seat 6 is driven to move by a second driving mechanism. During the movement of the movable seat 6, the capillary tube disk 2 starts to release the tubes, and the released capillaries are spirally coiled on the rotating shaft 1 through the rotation of the rotating shaft 1.

[0037] Step 2: The liquid nitrogen nozzle 3 sprays liquid nitrogen toward the capillary spirally wound on the rotating shaft 1 to cool the capillary.

[0038] In some embodiments, the liquid nitrogen nozzle 3 and the capillary coil move synchronously along the first direction. The liquid nitrogen nozzle 3 and the capillary coil 2 are both installed on the movable seat 6. The movable seat 6 is driven to translate by the second driving mechanism. One end of the second liquid supply pipe 5 is connected to the liquid nitrogen nozzle 3, and the other end is connected to the liquid nitrogen tank 10. Liquid nitrogen is provided to the liquid nitrogen nozzle 3. The liquid nitrogen nozzle 3 cools the capillary coiled on the rotating shaft 1, so that the water in the capillary condenses into ice.

[0039] Step 3: After the coiling is completed, remove the rotating shaft 1 and take out the spiral capillary.

[0040] Specifically, the liquid nitrogen tank 10 is closed to stop the delivery of liquid nitrogen, and then the rotating shaft 1 is disassembled to remove the coiled spiral capillary.

[0041] Furthermore, before step 1, the method further includes: introducing liquid nitrogen into the cavity of the rotating shaft 1 through the first liquid supply pipe 4 to cool the rotating shaft 1 .

[0042] That is to say, before the coiling starts, the cavity of the rotating shaft 1 itself is first filled with liquid nitrogen, and one end of the first liquid supply pipe 4 is rotatably connected to the rotating shaft 1, and the other end is connected to the liquid nitrogen tank 10. The infusion port of the liquid nitrogen tank 10 is opened, and liquid nitrogen is introduced into the cavity of the rotating shaft 1 through the first liquid supply pipe 4 to cool the hollow rotating shaft 1. When stable white frost appears on the rotating shaft 1, the first driving mechanism and the second driving mechanism are turned on, the chuck drives the rotating shaft 1 to rotate, and the moving seat 6 starts to translate at the same time, the capillary is spirally coiled on the rotating shaft 1, and then liquid nitrogen is provided to the liquid nitrogen nozzle 3 through the second liquid supply pipe 5, so that the liquid nitrogen nozzle 3 sprays liquid nitrogen toward the capillary to cool the spiral capillary.

[0043] The present invention provides a method for spirally coiling a thin-walled capillary. The method injects distilled water into the capillary, sprays liquid nitrogen outside the capillary during coiling, freezes the distilled water to prevent deformation of the capillary, cools a rotating shaft 1 to keep the capillary in an iced state, and realizes a stable capillary spiral coiling process through automatic rotation of a motor. Water condenses into ice at the temperature of liquid nitrogen, and will not liquefy due to stress when the thin-walled capillary is bent, causing the capillary to wrinkle and break. At the same time, solid ice can maintain the flow channel shape of the thin-walled capillary, thereby realizing stable and effective spiral coiling. Compared with a common coiling process, the method has the advantages of preventing deformation, simple operation, full automation, etc., and can realize the preparation of a spiral tube with an outer diameter of 1-3 mm. The diameter of the manufactured spiral tube is 4-8 mm, and basically no stress deformation occurs.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spiral coil device for thin-walled capillary tubes, characterized in that: include: A rotating shaft (1) configured to be rotatable about its axis; A capillary tube disk (2) is arranged on one side of the rotating shaft (1), the free end of the capillary tube disk (2) being fixed to the outer wall of the rotating shaft (1), the capillary tube disk (2) being able to move along a first direction when the rotating shaft (1) rotates so as to spirally coil the capillary tubes on the rotating shaft (1), and the capillary tubes are filled with water, the first direction being the same as the axial direction of the rotating shaft (1); A liquid nitrogen nozzle (3) is movably arranged on the outside of the rotating shaft (1) along the first direction, the nozzle of the liquid nitrogen nozzle (3) facing the rotating shaft (1), and is used for spraying liquid nitrogen toward the capillary tube coiled on the rotating shaft (1), so as to condense water in the capillary tube into ice.

2. The spiral coil device of thin-walled capillary according to claim 1, characterized in that: The rotating shaft (1) is provided with a cavity along the axial direction, one end of the cavity is connected to a first liquid supply pipe (4), and the first liquid supply pipe (4) is used to supply liquid nitrogen to the cavity.

3. The spiral coil device of thin-walled capillary according to claim 1, characterized in that: It also comprises a second liquid supply pipe (5), wherein the second liquid supply pipe (5) is connected to the liquid nitrogen nozzle (3) and is used to supply liquid nitrogen to the liquid nitrogen nozzle (3).

4. The spiral coil device of thin-walled capillary tube according to claim 1, characterized in that: It also comprises a first driving mechanism, which is in transmission connection with the rotating shaft (1) and is used to drive the rotating shaft (1) to rotate.

5. The spiral coil device of thin-walled capillary according to claim 4, characterized in that: It also comprises a frame (12), the first driving mechanism being arranged on the frame (12), and the two ends of the rotating shaft (1) being rotatably connected to the frame (12) respectively.

6. The spiral coil device of thin-walled capillary tube according to claim 1, characterized in that: It also comprises a movable seat (6) and a second driving mechanism, wherein the second driving mechanism is capable of driving the movable seat (6) to move along a first direction, and the liquid nitrogen spray pipe (3) and the capillary disk (2) are both arranged on the movable seat (6).

7. The spiral coil device of thin-walled capillary tube according to claim 6, characterized in that: A mounting frame (7) is provided on the movable seat (6), and the mounting frame (7) is connected to the liquid nitrogen spray pipe (3).

8. The spiral coil device of thin-walled capillary tube according to claim 6, characterized in that: The movable seat (6) is provided with a positioning assembly, the positioning assembly comprising a clamping bolt (8) and a clamping member, the capillary disk (2) is rotatably arranged in the clamping member, the clamping bolt (8) abuts against the clamping member to clamp it onto the movable seat (6).

9. A method for spirally coiling a thin-walled capillary tube, using the spirally coiling device for thin-walled capillary tube according to any one of claims 1 to 8, characterized in that: include: The free end of the capillary tube disk (2) is fixed to the outer wall of the rotating shaft (1); the rotating shaft (1) rotates, and the capillary tube disk (2) moves in a first direction, so that the capillary tube filled with water is spirally wound on the rotating shaft (1); The liquid nitrogen nozzle (3) sprays liquid nitrogen toward the capillary tube spirally wound on the rotating shaft (1) to cool the capillary tube; After coiling, remove the rotating shaft (1) and take out the spiral capillary.

10. A method for spirally coiling a thin-wall capillary according to claim 9, characterized in that: The free end of the capillary tube disk (2) is fixed to the outer wall of the rotating shaft (1), and the rotating shaft (1) rotates while the capillary tube disk (2) moves in a first direction, so that the capillary tube filled with water is spirally wound on the rotating shaft (1), and the method also includes: Liquid nitrogen is introduced into the cavity of the rotating shaft (1) through the first liquid supply pipe (4) to cool the rotating shaft (1).

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