A thin-walled capillary spiral coil device and method

Abstract

The present application relates to heat exchanger technical field, provide a kind of thin-walled capillary tube's spiral coil equipment and method, spiral coil equipment includes: rotating shaft, it is set to can rotate around its axis;Capillary tube disc, it is set in the one side of rotating shaft, the free end of capillary tube disc is fixed on the outer side wall of rotating shaft, capillary tube disc can move in first direction when rotating shaft rotates, to spiral coil with capillary tube on rotating shaft, and water is filled in capillary tube, first direction is identical with the axial direction of rotating shaft;Liquid nitrogen lance, it is movably arranged in the outer side of rotating shaft along first direction, the injection port of liquid nitrogen lance is towards rotating shaft, for spraying liquid nitrogen to the capillary tube that is spirally wound on rotating shaft, to condense water in capillary tube into ice;The present application prevents stress buckling deformation in the spiral process of thin-walled capillary tube, and realizes stable automatic spiral coil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to a spiral coil device and method of thin-walled capillary tubes. BACKGROUND

[0002] The spiral coil heat exchanger of capillary tubes is a common technology in the field of dilution refrigerator heat exchangers and other heat exchangers, which uses the unique properties of capillary tubes to improve heat exchange efficiency, and increases the length and heat exchange area of the capillary tubes by bending them into a spiral shape in a limited space.

[0003] The current coil process has a large defect, which is usually directly bent and folded, which can easily cause stress deformation of the capillary tube, resulting in wrinkles and breakage of the capillary tube, which seriously affects its use, especially when the spiral diameter of the capillary spiral coil is small, stress bending deformation or even breakage can easily occur during the coiling process, thereby seriously affecting the effect of the heat exchanger. SUMMARY

[0004] The present application provides a spiral coil device and method of thin-walled capillary tubes to solve the problem of stress deformation of capillary tubes in the coil process in the prior art.

[0005] The present application provides a spiral coil device of thin-walled capillary tubes, comprising:

[0006] A rotating shaft is arranged to be able to rotate around its axis;

[0007] A capillary tube coil is arranged on one side of the rotating shaft, the free end of the capillary tube coil is fixed on the outer side wall of the rotating shaft, the capillary tube coil can move in a first direction when the rotating shaft rotates, to coil the capillary tube on 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;

[0008] A liquid nitrogen jet pipe is movably arranged on the outer side of the rotating shaft along the first direction, the jet port of the liquid nitrogen jet pipe faces the rotating shaft, and is used to spray liquid nitrogen to the capillary tube coiled on the rotating shaft, to condense the water in the capillary tube into ice.

[0009] According to the spiral coil device of thin-walled capillary tubes provided by the present application, the rotating shaft is provided with a cavity in the axial direction, one end of the cavity is connected with a first liquid supply pipe, and the first liquid supply pipe is used to supply liquid nitrogen to the cavity.

[0010] According to the spiral coil device of thin-walled capillary tubes provided by the present application, further comprising a second liquid supply pipe, the second liquid supply pipe is connected with the liquid nitrogen jet pipe, and is used to supply liquid nitrogen to the liquid nitrogen jet pipe.

[0011] The thin-walled capillary spiral coil device further comprises a first driving mechanism, which is in transmission connection with the rotating shaft and used for driving the rotating shaft to rotate.

[0012] The thin-walled capillary spiral coil device further comprises a rack, and the first driving mechanism is arranged on the rack, and both ends of the rotating shaft are in rotation connection with the rack.

[0013] The thin-walled capillary spiral coil device further comprises a moving base and a second driving mechanism, the second driving mechanism is capable of driving the moving base to move in a first direction, and the liquid nitrogen spray pipe and the capillary coil are arranged on the moving base.

[0014] The thin-walled capillary spiral coil device further comprises a mounting rack arranged on the moving base and connected with the liquid nitrogen spray pipe.

[0015] The thin-walled capillary spiral coil device further comprises a positioning assembly arranged on the moving base, the positioning assembly comprises a pressing bolt and a clamping piece, the capillary coil is rotatably arranged in the clamping piece, and the pressing bolt is in abutment with the clamping piece and used for pressing the clamping piece on the moving base.

[0016] In the second aspect, the present application provides a thin-walled capillary spiral coil method, which adopts the thin-walled capillary spiral coil device as described in the first aspect and comprises the following steps.

[0017] The free end of the capillary coil is fixed on the outer side wall of the rotating shaft, the rotating shaft is rotated, the capillary coil is moved in a first direction, and the capillary filled with water is spirally wound on the rotating shaft.

[0018] The liquid nitrogen spray pipe sprays liquid nitrogen to the capillary spirally wound on the rotating shaft, so as to cool the capillary.

[0019] After the spiral coil is completed, the rotating shaft is disassembled, and the spiral capillary is removed.

[0020] The thin-walled capillary spiral coil method further comprises the following steps before the step of fixing the free end of the capillary coil on the outer side wall of the rotating shaft, rotating the rotating shaft, and moving the capillary coil in a first direction to spirally wind the capillary filled with water on the rotating shaft.

[0021] Liquid nitrogen is introduced into the cavity of the rotating shaft through the first liquid supply pipe, so as to cool the rotating shaft.

[0022] The present invention provides a spiral coiling device for thin-walled capillaries, comprising a rotating shaft, a capillary coil, and a liquid nitrogen spray pipe. A capillary filled with water is spirally coiled around the rotating shaft, and liquid nitrogen is sprayed onto 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, rapidly cooling the capillary. The solid ice can maintain the flow channel shape of the thin-walled capillary, thereby preventing stress deformation in the capillary during the coiling process, particularly capillary wrinkling and rupture that are prone to occur when the thin-walled capillary is bent, thereby achieving stable and effective spiral coiling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to 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 any creative work.

[0024] Figure 1 The figure is a schematic diagram of the overall structure of a spiral coil device of a thin-walled capillary tube provided by an embodiment of the present invention.

[0025] Figure 2 The present invention provides a flowchart of a method for spirally coiling a thin-walled capillary tube.

[0026] Reference numerals:

[0027] 1. Rotating shaft; 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. Rotary joint; 12. Rack. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0029] The following combination Figures 1-2 The present invention describes a spiral coiling device and method for thin-walled capillary tubes.

[0030] This embodiment provides a spiral coil device for thin-walled capillaries, comprising: a rotating shaft 1 , a capillary coil 2 , and a liquid nitrogen nozzle 3 .

[0031] The rotating shaft 1 is horizontally arranged and can rotate around its axis; the capillary tube disc 2 is arranged on one side of the rotating shaft 1, the free end of the capillary tube disc 2 is fixed on the outer side wall of the rotating shaft 1, the capillary tube disc 2 can move in the first direction when the rotating shaft 1 rotates, so as to wind the capillary tube on the rotating shaft 1, and the capillary tube is filled with water, the first direction is the same as the axial direction of the rotating shaft 1; the liquid nitrogen spray pipe 3 is movably arranged on the outer side of the rotating shaft 1 in the first direction, the spray port of the liquid nitrogen spray pipe 3 faces the rotating shaft 1, and the liquid nitrogen spray pipe 3 is used for spraying liquid nitrogen to the capillary tube wound on the rotating shaft 1, so as to condense the water in the capillary tube into ice.

[0032] According to the above scheme, the capillary tube filled with water is wound on the rotating shaft 1, and liquid nitrogen is sprayed to the capillary tube during the winding process, the water in the capillary tube is condensed into ice under the heat exchange of the liquid nitrogen by using the extremely strong cooling capacity of the liquid nitrogen, the capillary tube is rapidly cooled, the solid ice can maintain the flow channel shape of the thin-walled capillary tube, so as to prevent the stress deformation of the capillary tube during the coiling process, especially the capillary tube creases and breakage phenomenon easily occurred when the thin-walled capillary tube is bent, and stable and effective spiral coiling is realized.

[0033] Further, the rotating shaft 1 is provided with a cavity in the axial direction, one end of the cavity is connected with the first liquid supply pipe 4, the first liquid supply pipe 4 is rotatably connected with the rotating shaft 1 through the rotating joint 11, and the first liquid supply pipe 4 is used for supplying liquid nitrogen to the cavity.

[0034] In this way, the rotating shaft 1 is hollowly arranged, and the liquid nitrogen is introduced into the cavity, and the extremely low temperature characteristics of the liquid nitrogen are used to ensure that the rotating shaft 1 can rapidly reach the required low temperature state, the liquid nitrogen is introduced into the cavity of the rotating shaft 1, on the one hand, the liquid nitrogen spray pipe 3 can be used together to cool the capillary tube, so that the water in the capillary tube is solidified and frozen 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, the water in the capillary tube wound on the rotating shaft 1 can continue to maintain the frozen state during the movement of the liquid nitrogen spray pipe 3, prevent local liquefaction, and realize stable spiral coiling process.

[0035] In some embodiments, the second liquid supply pipe 5 is further included, the second liquid supply pipe 5 is connected with the liquid nitrogen spray pipe 3 and used for supplying liquid nitrogen to the liquid nitrogen spray pipe 3, and the first liquid supply pipe 4 and the second liquid supply pipe 5 are both connected with the liquid nitrogen tank 10.

[0036] In the embodiment, the first driving mechanism is further included, the first driving mechanism is in transmission connection with the rotating shaft 1 and used for driving the rotating shaft 1 to rotate, the first driving mechanism can be a driving motor, and the driving motor and the rotating shaft 1 can be in transmission connection through belt transmission, chain transmission, gear transmission and the like, so as to realize automatic rotation of the rotating shaft 1.

[0037] In some embodiments, the rack 12 is further included, the first driving mechanism is arranged on the rack 12, the rotating shaft 1 is horizontally arranged on the rack 12, and the two ends of the rotating shaft 1 are respectively rotationally connected with the rack 12, so as to realize that the capillary tube disc 2 is wound on the part 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.

[0038] For example, a chuck is arranged at one end of the rack 12, the chuck can be a three-jaw chuck, which is used for clamping and fixing the rotating shaft 1, and the end of the rotating shaft 1 away from the chuck is rotationally connected with the rack 12 through a bearing, and the chuck is driven to rotate by the driving motor, so as to drive the rotating shaft 1 to rotate.

[0039] In the embodiment, the moving seat 6 and the second driving mechanism are further included, the second driving mechanism can drive the moving seat 6 to move in the first direction, and the liquid nitrogen spray pipe 3 and the capillary tube disc 2 are arranged on the moving seat 6, so that the capillary tube disc 2 and the liquid nitrogen spray pipe 3 move synchronously. Figure 1 As shown in the figure, the mounting frame 7 is arranged on the moving seat 6, the mounting frame 7 is connected with the liquid nitrogen spray pipe 3, and is used for supporting and fixing the liquid nitrogen spray pipe 3; the positioning assembly is arranged on the moving seat 6, the positioning assembly includes the compression bolt 8 and the clamping piece, the capillary tube disc 2 is rotationally arranged in the clamping piece, and the compression bolt 8 abuts against the clamping piece and is used for compressing the clamping piece on the moving seat 6.

[0040] In this way, by designing the automatic movement of the moving seat 6, the automation degree of operation is improved, the continuity and stability of the whole coiling process can be ensured, the production interruption caused by improper manual operation is avoided, the work efficiency is improved, the movement speed of the moving seat 6 can be conveniently controlled by the second driving mechanism, each product can be processed according to the same process parameters, the consistency between products is ensured, the coiling quality is improved, the pitch adjustment of the spiral capillary tube formed in the coiling process can be realized, and the demand for different products can be met; since the liquid nitrogen spray pipe 3 and the capillary tube disc 2 move synchronously, the accurate correspondence in the spatial position can be ensured, which is helpful to realize more uniform cooling effect, ensure uniform heating of the capillary tube, and avoid quality problems caused by uneven cooling.

[0041] Alternatively, the moving seat 6 is connected with the supporting surface in a sliding mode, for example, the moving seat 6 is provided with a sliding block, the supporting surface such as the ground is provided with a sliding rail 9 in the first direction, the sliding block and the sliding rail 9 are matched to realize the sliding connection between the moving seat 6 and the supporting surface, and of course, the sliding rail 9 can also be arranged on the rack 12.

[0042] The second driving mechanism can be a linear transmission mode such as an electric cylinder, a gas cylinder, a hydraulic cylinder, a ball screw, a synchronous belt, etc., for example, a ball screw is adopted, a motor drives the screw to rotate, a nut is connected with the moving base 6, and the nut moves linearly driven by the screw rotation, so as to drive the moving base 6 to move linearly in the first direction.

[0043] The embodiment of the present application also provides a spiral coil method of a thin-wall capillary tube, which adopts the spiral coil equipment of the thin-wall capillary tube and comprises the following steps:

[0044] Step 1: fixing the free end of the capillary tube coil 2 on the outer side wall of the rotating shaft 1, rotating the rotating shaft 1, and moving the capillary tube coil 2 along the first direction, so as to spiral coil the capillary tube filled with water on the rotating shaft 1.

[0045] In some embodiments, step 1 specifically comprises: loading the rotating shaft 1 on the rack 12, driving it to rotate through the first driving mechanism, rotatably arranging the capillary tube coil 2 on the moving base 6, fixing the free end of the capillary tube coil 2 on the outer side wall of the rotating shaft 1, and driving the moving base 6 to move through the second driving mechanism, in the process of moving the moving base 6, the capillary tube coil 2 starts to coil the capillary tube, and the coiled capillary tube is spirally coiled on the rotating shaft 1 through the rotation of the rotating shaft 1.

[0046] Step 2: spraying liquid nitrogen on the capillary tube spirally coiled on the rotating shaft 1 through the liquid nitrogen spray pipe 3, and cooling the capillary tube.

[0047] In some embodiments, the liquid nitrogen spray pipe 3 and the capillary tube move synchronously along the first direction, the liquid nitrogen spray pipe 3 and the capillary tube coil 2 are both installed on the moving base 6, the moving base 6 is driven to move through the second driving mechanism, one end of the second liquid supply pipe 5 is connected with the liquid nitrogen spray pipe 3, and the other end is connected with the liquid nitrogen tank 10, liquid nitrogen is supplied to the liquid nitrogen spray pipe 3, the liquid nitrogen spray pipe 3 cools the capillary tube coiled on the rotating shaft 1, and the water in the capillary tube is condensed into ice.

[0048] Step 3: after the coiling is completed, the rotating shaft 1 is disassembled, and the spiral capillary tube is removed.

[0049] Specifically, the liquid nitrogen is stopped from being delivered by closing the liquid nitrogen tank 10, and then the rotating shaft 1 is disassembled and the coiled spiral capillary tube is removed.

[0050] Further, before step 1, the following step is further included: introducing liquid nitrogen into the cavity of the rotating shaft 1 through the first liquid supply pipe 4, and cooling the rotating shaft 1.

[0051] That is, before the coil starts, liquid nitrogen is first filled in the cavity of the rotating shaft 1, and the first liquid supply pipe 4 is connected to the rotating shaft 1 at one end and connected to the liquid nitrogen tank 10 at the other end, the liquid supply opening of the liquid nitrogen tank 10 is opened, liquid nitrogen is supplied to the cavity of the rotating shaft 1 through the first liquid supply pipe 4, the hollow rotating shaft 1 is cooled, and when stable frost appears on the rotating shaft 1, the first driving mechanism and the second driving mechanism are started, the chuck drives the rotating shaft 1 to rotate, and the moving seat 6 starts to translate, the capillary spiral is wound on the rotating shaft 1, and then liquid nitrogen is supplied to the liquid nitrogen jet pipe 3 through the second liquid supply pipe 5, so that the liquid nitrogen jet pipe 3 sprays liquid nitrogen towards the capillary, and the spiral capillary is cooled.

[0052] The present application provides a spiral coil method of thin-walled capillary, which prevents the capillary from deforming by injecting distilled water into the capillary and spraying liquid nitrogen outside the capillary during the coil to make the distilled water freeze, and keeps the frozen state by cooling the rotating shaft 1, and realizes a stable spiral coil process of the capillary by automatic rotation of the motor, wherein the water condenses into ice at the temperature of liquid nitrogen and does not liquefy due to the stress of the thin-walled capillary when bending, causing the capillary to wrinkle and break, and the solid ice can maintain the shape of the flow passage of the thin-walled capillary, realizing stable and effective spiral coil, compared with the ordinary coil process, the spiral pipe with an outer diameter of 1-3mm can be prepared, the prepared spiral pipe has a diameter of 4-8mm and basically does not appear stress deformation.

[0053] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

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), a free end of the capillary tube disk (2) is fixed to the outer side wall of the rotating shaft (1), the capillary tube disk (2) is capable of moving in 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, and the first direction is the same as the axial direction of the rotating shaft (1); A liquid nitrogen nozzle (3) is movably arranged outside the rotating shaft (1) along the first direction, with a nozzle opening of the liquid nitrogen nozzle (3) facing the rotating shaft (1) and used for spraying liquid nitrogen toward the capillary tube wound around the rotating shaft (1) to condense water in the capillary tube into ice.

2. The spiral coil device of thin-walled capillary tube 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 tube according to claim 1, characterized in that: It also includes a second liquid supply pipe (5), which 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 includes 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 tube according to claim 4, characterized in that: It also includes a frame (12), the first driving mechanism is arranged on the frame (12), and both ends of the rotating shaft (1) are respectively rotatably connected to the frame (12).

6. The spiral coil device of thin-walled capillary tube according to claim 1, characterized in that: It also includes 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 nozzle (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 nozzle (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, which includes a clamping bolt (8) and a clamping member. The capillary tube disk (2) is rotatably arranged in the clamping member. The clamping bolt (8) abuts against the clamping member to press 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), 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); 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 the coiling is completed, remove the rotating shaft (1) and take out the spiral capillary.

10. The method for spirally coiling a thin-walled capillary tube according to claim 9, characterized in that: The free end of the capillary tube disk (2) is fixed to the outer side 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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