An automatic regulating shielding and heat preservation device for a miniature reactor and its operation method

Abstract

Embodiments of the present invention provide a self-regulating shielding and heat-insulating device for a micro reactor and an operation method thereof, which relate to the field of nuclear reactors. The device includes: an outer shell, an inner shell, a control rod, and a spiral flow channel; the outer shell is sleeved on the inner shell, an outer air inlet hole and an outer air outlet hole are formed on the outer shell, an inner air inlet hole and an inner air outlet hole are formed on the inner shell, a reaction chamber is formed inside the inner shell, the spiral flow channel is arranged outside the inner shell and inside the outer shell, the control rod is rotatably inserted through the side wall of the inner shell and is located inside the outer shell, the control rod has a control area and a non-control area, and the spiral flow channel is arranged between the inner shell and the outer shell; the outer air inlet hole is used for inputting cooling gas so that the cooling gas sequentially passes through the inner air inlet hole, the reaction chamber, the inner air outlet hole, and the spiral flow channel, and then is discharged from the outer air outlet hole, and the cooling gas is used for flowing along the spiral flow channel and making the control rod rotate to drive the control area to turn into or out of the reaction chamber.

Description

Technical Field

[0001] The present invention relates to the field of nuclear reactors, and more particularly, to a self-regulating shielding and heat insulation device for a micro reactor and an operation method thereof. Background Art

[0002] During the nuclear reaction operation of a micro reactor, a driving mechanism is usually provided to drive the control rod to move, so as to dynamically adjust the reaction process of the reactor.

[0003] In order to facilitate the movement of the control rod, the control rod usually extends to the outside of the outer shell, which may lead to heat leakage. Summary of the Invention

[0004] The present invention provides a self-regulating shielding and heat insulation device for a micro reactor and an operation method thereof, which can make the control rod located inside the outer shell, thereby reducing heat leakage and achieving a better heat insulation effect.

[0005] Embodiments of the present invention may be implemented as follows:

[0006] An embodiment of the present invention provides a self-regulating shielding and heat insulation device for a micro reactor, which includes:

[0007] An outer shell, an inner shell, a control rod, and a spiral flow channel;

[0008] Wherein, the outer shell is sleeved outside the inner shell, an outer air inlet hole and an outer air outlet hole are formed on the outer shell, inner air inlet holes and inner air outlet holes are respectively formed at both ends of the inner shell, a reaction chamber is formed inside the inner shell, the spiral flow channel is arranged outside the inner shell and inside the outer shell, the control rod is rotatably inserted through the side wall of the inner shell and located inside the outer shell, the control rod has a control area and a non-control area, and the spiral flow channel is arranged between the inner shell and the outer shell;

[0009] The outer air inlet hole is used to input cooling gas, so that the cooling gas sequentially passes through the inner air inlet hole, the reaction chamber, the inner air outlet hole, and the spiral flow channel, and then is discharged from the outer air outlet hole. The cooling gas is used to flow along the spiral flow channel and make the control rod rotate, so as to drive the control area to rotate into or out of the reaction chamber.

[0010] Optionally, a top plate is formed at the top end of the inner shell, the top plate abuts against the inner wall of the outer shell, the top plate protrudes from the side wall of the inner shell, the inner air inlet hole is opened on the top plate, the outer air inlet hole is arranged higher than the top plate, and the outer air outlet hole is arranged lower than the top plate.

[0011] Optionally, the top plate is used to separate the space between the outer housing and the outer housing into an intake chamber and a heat-insulating chamber, and the spiral flow channel is accommodated in the heat-insulating chamber.

[0012] Optionally, a bottom plate is formed at the bottom end of the inner housing, the bottom plate protrudes from the side wall of the inner housing and is spaced from the inner wall of the outer housing, and the inner air outlet is formed in the bottom plate.

[0013] Optionally, the inner wall of the spiral flow channel is connected to the outer wall of the inner housing, and the control rod is rotatably arranged inside the spiral flow channel.

[0014] Optionally, the control area and the non-control area are symmetrically arranged and extend along the axial direction of the control rod.

[0015] Optionally, the number of the control rods is at least three, and the at least three control rods are evenly arranged along the circumferential direction of the inner housing.

[0016] Optionally, the inner air intake hole is circular or strip-shaped, and the inner air outlet hole is circular.

[0017] Optionally, the outer air intake hole is circular, and the outer air outlet hole is circular.

[0018] An embodiment of the present invention further provides an operation method for a self-regulating shielding and heat-insulating device for a micro-reactor, which is realized by the self-regulating shielding and heat-insulating device for a micro-reactor. The operation method for the self-regulating shielding and heat-insulating device for a micro-reactor includes:

[0019] Controlling the cooling gas to enter the reaction chamber through the outer air intake hole and the inner air intake hole for heat absorption;

[0020] Controlling the cooled gas after heat absorption to flow through the inner air outlet and along the spiral flow channel;

[0021] Controlling the control rod to rotate under the action of the cooling gas, and driving the control area to turn into or out of the reaction chamber;

[0022] Controlling the cooling gas to pass through the outer air outlet.

[0023] The beneficial effects of the self-regulating shielding and heat-insulating device for a micro-reactor according to the embodiment of the present invention include, for example:

[0024] The self-regulating shielding and heat-insulating device for a micro-reactor includes an outer shell, an inner shell, a control rod, and a spiral flow channel. The outer shell is sleeved outside the inner shell. An outer air inlet hole and an outer air outlet hole are formed on the outer shell. Inner air inlet holes and inner air outlet holes are respectively formed at both ends of the inner shell. A reaction chamber is formed inside the inner shell. The spiral flow channel is arranged outside the inner shell and inside the outer shell. The control rod is rotatably inserted through the side wall of the inner shell and is located inside the outer shell. The control rod has a control area and a non-control area. The spiral flow channel is arranged between the inner shell and the outer shell. The outer air inlet hole is used to input cooling gas, so that the cooling gas sequentially passes through the inner air inlet hole, the reaction chamber, the inner air outlet hole, and the spiral flow channel, and then is discharged from the outer air outlet hole. The cooling gas is used to flow along the spiral flow channel and make the control rod rotate, so as to drive the control area to rotate into or out of the reaction chamber. During the working process, the cooling gas can absorb heat in the reaction chamber first, and then flow along the spiral flow channel. The flow of the cooled gas after heat absorption drives the control rod to rotate relative to the inner shell, so that the volume of the control area in the reaction chamber increases or decreases, thereby realizing the dynamic adjustment of the reaction process. And during this process, the control rod is located inside the outer shell, thereby reducing heat leakage and achieving a better heat-insulating effect. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic external structure diagram of the self-regulating shielding and heat-insulating device for a micro-reactor provided in the embodiment of the present invention;

[0027] Figure 2 It is a schematic cross-sectional view of the self-regulating shielding and heat-insulating device for a micro-reactor provided in the embodiment of the present invention from the first perspective;

[0028] Figure 3 It is a schematic cross-sectional view of the self-regulating shielding and heat-insulating device for a micro-reactor provided in the embodiment of the present invention from the second perspective;

[0029] Figure 4 It is a schematic internal structure diagram of the self-regulating shielding and heat-insulating device for a micro-reactor provided in the embodiment of the present invention from the third perspective;

[0030] Figure 5 It is a schematic internal structure diagram of the self-regulating shielding and heat-insulating device for a micro-reactor provided in the embodiment of the present invention from the fourth perspective.

[0031] Icons: 100 - Self - regulating shielding and heat - insulating device for a micro - reactor; 110 - Outer housing; 111 - Outer air inlet hole; 112 - Outer air outlet hole; 113 - Air inlet chamber; 114 - Heat - insulating chamber; 120 - Inner housing; 121 - Inner air inlet hole; 122 - Inner air outlet hole; 123 - Reaction chamber; 124 - Top plate; 125 - Bottom plate; 130 - Control rod; 131 - Control area; 132 - Non - control area; 140 - Spiral flow channel. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the invention is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0036] In addition, if terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0037] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element qualified by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

[0038] Unless otherwise expressly specified and defined, terms such as "arranged" and "connected" shall be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0040] As described in the background art, during the nuclear reaction operation of a micro-reactor, a driving mechanism is usually provided to drive the control rod to move, so as to dynamically adjust the reaction process of the reactor. And in order to facilitate the movement of the control rod, the control rod usually extends to the outside of the outer shell, which in turn leads to heat leakage.

[0041] Please refer to Figure 1 , the self-regulating shielding and heat insulation device 100 for a micro-reactor and the operation method of the self-regulating shielding and heat insulation device for a micro-reactor provided in the embodiments of the present invention can solve the above problems, and will be described in detail below.

[0042] Refer to Figures 2 - 4 , the self-regulating shielding and heat insulation device 100 for a micro-reactor includes an outer shell 110, an inner shell 120, a control rod 130 and a spiral flow channel 140;

[0043] Wherein, the outer shell 110 is sleeved on the outside of the inner shell 120, an outer air inlet hole 111 and an outer air outlet hole 112 are formed on the outer shell 110, inner air inlet holes 121 and inner air outlet holes 122 are respectively formed at both ends of the inner shell 120, a reaction chamber 123 is formed inside the inner shell 120, the spiral flow channel 140 is arranged on the outside of the inner shell 120 and the inside of the outer shell 110, the control rod 130 is rotatably inserted through the side wall of the inner shell 120 and is located inside the outer shell 110, the control rod 130 has a control area 131 and a non-control area 132, and the spiral flow channel 140 is arranged between the inner shell 120 and the outer shell 110;

[0044] The external air inlet hole 111 is used to input cooling gas, so that the cooling gas sequentially passes through the internal air inlet hole 121, the reaction chamber 123, the internal air outlet hole 122 and the spiral flow channel 140, and then is discharged from the external air outlet hole 112. The cooling gas is used to flow along the spiral flow channel 140 and make the control rod 130 rotate, so as to drive the control area 131 to rotate into or out of the reaction chamber 123.

[0045] During the working process, the cooling gas can absorb heat in the reaction chamber 123 first, and then flow along the spiral flow channel 140. The flow of the cooled gas after heat absorption drives the control rod 130 to rotate relative to the inner housing 120, so that the volume of the control area 131 in the reaction chamber 123 increases or decreases, thereby realizing the dynamic regulation of the reaction process; and in this process, the control rod 130 is located inside the outer housing 110, thus reducing heat leakage.

[0046] It should be noted that when the control area 131 is located in the reaction chamber 123, it can reflect the neutrons in the reaction chamber 123, thereby realizing the regulation of the reaction power. When the volume of the control area 131 in the reaction chamber 123 is larger, the power of the reactor is smaller; when the volume of the control area 131 in the reactor is smaller, the power of the reactor is larger.

[0047] Under normal circumstances, half of the volume of the control area 131 is located in the reaction chamber 123. At this time, the temperature in the reaction chamber 123 is relatively high, and the temperature and pressure of the cooling gas when flowing out of the reaction chamber 123 are also relatively high [the flow state of the cooling gas can be adjusted according to the ideal gas state equation formula: pV = nRT (where p is the pressure, V is the gas volume, n is the amount of substance of the gas, R is the molar gas constant, and T is the temperature)]. At this time, the cooling gas will push the control rod 130 to rotate, so that a larger volume of the control area 131 rotates into the reaction chamber 123, thereby reducing the reaction power. Moreover, this adjustment process can reach a dynamic balance, so that the nuclear reaction in the reaction chamber 123 and the rotation of the control rod 130 reach a dynamically stable process.

[0048] In addition, in order to further improve the adjustment efficiency, the charging rate, flow rate, etc. of the cooling gas can be adjusted to realize the adjustment of the temperature and pressure of the cooling gas, and then the relative rotation rate of the control rod 130 and the reaction power can be adjusted.

[0049] In this embodiment, the outer housing 110 is an approximate capsule structure with hemispherical ends at both ends. Only the external air inlet hole 111 and the external air outlet hole 112 are provided on the outer housing 110, and the control rod 130 does not penetrate the outer housing 110. Therefore, the heat leakage position on the outer housing 110 is reduced, and the heat preservation effect of the overall reactor is improved.

[0050] Reference Figures 2 - 4 Figures 2 - 4 The number of the control rods 130 is at least three, and the at least three control rods 130 are uniformly arranged along the circumferential direction of the inner housing 120. In this embodiment, the number of the control rods 130 is nine; of course, in other embodiments of the present invention, the number of the control rods 130 can also be two, three, five, eight, twelve, etc., and the specific number of settings thereof is not limited.

[0051]

[0051] Moreover, each control rod 130 is in a round rod shape, and the control area 131 and the non-control area 132 are symmetrically arranged and extend along the axial direction of the control rod 130. It can be understood that both the control area 131 and the non-control area 132 are in a semi-circular rod-shaped structure of equal size.

[0052] Reference Figures 2 - 4 Figures 2 - 4 The top end of the inner housing 120 is formed with a top plate 124. The top plate 124 abuts against the inner wall of the outer housing 110. The top plate 124 protrudes from the side wall of the inner housing 120. The inner air inlet hole 121 is opened on the top plate 124. The outer air inlet hole 111 is arranged higher than the top plate 124, and the outer air outlet hole 112 is arranged lower than the top plate 124.

[0053]

[0053] Moreover, the top plate 124 is used to separate the space between the outer housing 110 and the inner housing 110 into an air inlet chamber 113 and a heat preservation chamber 114, and the spiral flow channel 140 is accommodated in the heat preservation chamber 114.

[0054]

[0054] During the air inlet and outlet process, the cooling gas will first enter the air inlet chamber 113 through the outer air inlet hole 111, and then enter the reaction chamber 123 through the inner air inlet hole 121. After fully absorbing the heat generated by the nuclear reaction in the reaction chamber 123, it will pass through the inner air outlet hole 122 into the heat preservation chamber 114 and flow along the spiral flow channel 140, and finally flow out through the outer air outlet hole 112. The flow path of the overall cooling gas can be regarded as U-shaped, and the path length of one end (the air inlet direction) of the U shape is higher than that of the other end (the air outlet direction).

[0055]

[0055] It should be noted that by forming the heat preservation chamber 114, when the flowing cooling gas rotates and drives the control rod 130, the heat preservation effect on the reaction chamber 123 can be realized, so that the cooling gas can only be discharged through the outer air outlet hole 112, and there is no leakage through other gaps, thereby reducing the heat leakage and improving the heat preservation effect on the reaction chamber 123.

[0056] In this embodiment, the outer air inlet holes 111 are circular, and the number of the outer air inlet holes 111 is four, and the four outer air inlet holes 111 are evenly distributed along the circumferential direction of the outer housing 110. Of course, in other embodiments of the present invention, the outer air inlet holes 111 may also be strip-shaped, triangular, fan-shaped, rectangular, etc., and the number thereof may also be one, three, five, eight, etc. The specific shape and the specific number of the outer air inlet holes 111 are not limited.

[0057] In this embodiment, the outer air outlet holes 112 are circular, and the number of the outer air outlet holes 112 is four, and the four outer air outlet holes 112 are evenly distributed along the circumferential direction of the outer housing 110. Of course, in other embodiments of the present invention, the outer air outlet holes 112 may also be strip-shaped, triangular, fan-shaped, rectangular, etc., and the number thereof may also be one, three, five, eight, etc. The specific shape and the specific number of the outer air outlet holes 112 are not limited.

[0058] Reference Figures 2 - 4 , the inner air inlet holes 121 are circular and / or strip-shaped. In this embodiment, the inner air inlet holes 121 are arranged in multiple groups along the radial direction of the top plate 124. The multiple groups of inner air inlet holes 121 are respectively circular or strip-shaped, and each group of air inlet holes is evenly distributed along the circumferential direction of the top plate 124. The number of the air inlet holes in the innermost group is one. In other embodiments of the present invention, the inner air inlet holes 121 may also be oval, triangular, fan-shaped, rectangular, etc. The specific shape and the specific number of the inner air inlet holes 121 are not limited.

[0059] Similarly, the inner air outlet holes 122 are circular. In this embodiment, the inner air outlet holes 122 are arranged in multiple groups along the radial direction of the top plate 124. The multiple groups of inner air outlet holes 122 are respectively circular or strip-shaped, and each group of air outlet holes is evenly distributed along the circumferential direction of the top plate 124. The number of the air outlet holes in the innermost group is one. In other embodiments of the present invention, the inner air outlet holes 122 may also be oval, triangular, fan-shaped, rectangular, etc. The specific shape and the specific number of the inner air outlet holes 122 are not limited.

[0060] Reference Figures 3 - 5 , a bottom plate 125 is formed at the bottom end of the inner housing 120. The bottom plate 125 protrudes from the side wall of the inner housing 120 and is spaced from the inner wall of the outer housing 110. The inner air outlet holes 122 are formed in the bottom plate 125 so that the cooling gas can quickly change direction when passing through the inner air outlet holes 122 and flow spirally along the spiral flow channel 140.

[0061] Reference Figures 3 - 5 , in order to improve the pushing effect of the cooling gas flowing along the spiral flow channel 140 on the control rod 130, the inner wall of the spiral flow channel 140 can be connected to the outer wall of the inner housing 120, and the control rod 130 is rotatably arranged inside the spiral flow channel 140.

[0062] An embodiment of the present invention also provides an operation method for a self-regulating shielding and heat-insulating device for a micro-reactor, which is implemented by the self-regulating shielding and heat-insulating device 100 for a micro-reactor. The operation method for the self-regulating shielding and heat-insulating device for a micro-reactor includes:

[0063] Step S100: Control the cooling gas to enter the reaction chamber 123 through the outer air inlet hole 111 and the inner air inlet hole 121 for heat absorption;

[0064] Step S200: Control the heat-absorbed cooling gas to pass through the inner air outlet hole 122 and flow along the spiral flow channel 140;

[0065] Step S300: Control the control rod 130 to rotate under the action of the cooling gas, and drive the control area 131 to rotate into or out of the reaction chamber 123;

[0066] Step S400: Control the cooling gas to pass through the outer air outlet hole 112.

[0067] In summary, the self-regulating shielding and heat-insulating device for a micro-reactor and its operation method provided by the embodiments of the present invention at least have the following advantages:

[0068] (1) The self-regulating shielding and heat-insulating device 100 for a micro-reactor can guide the heat-absorbed cooling gas to flow through the spiral flow channel 140, thereby generating a thrust on the control rod 130, causing the control rod 130 to rotate relative to the inner housing 120, and changing the volume of the control area 131 located in the reaction chamber 123, realizing the adjustment operation of the reaction power.

[0069] (2) The self-regulating shielding and heat-insulating device 100 for a micro-reactor can place the control rod 130 inside the outer housing 110, avoiding the control rod 130 penetrating the outer housing 110, so that the outer housing 110 only has the outer air inlet hole 111 and the outer air outlet hole 112 for the inflow and outflow of the cooling gas, reducing the heat leakage position, thereby reducing the heat dissipation and improving the heat insulation effect on the reaction chamber 123.

[0070] (3) The self-regulating shielding and heat-insulating device 100 for a micro-reactor can guide the heat-absorbed cooling gas to flow through the spiral flow channel 140, extending the path of the heat-absorbed cooling gas flowing out of the outer housing 110, increasing the residence time of the heat in the heat-insulating chamber 114, and thereby improving the heat insulation effect on the reaction chamber 123.

[0071] (4) The self-regulating shielding and heat-insulating device 100 for a micro-reactor can realize the heat insulation function while realizing the self-regulating function, without the need for separate heat insulation mechanisms and adjustment mechanisms to assist the operation, further improving the reaction efficiency and the portability of the micro-reactor.

[0072] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described above.

Claims

1. A self-regulating shielding and heat preservation device for a micro-pile, characterized in that: include: An outer shell (110), an inner shell (120), a control rod (130) and a spiral flow channel (140); The outer shell (110) is sleeved on the outer side of the inner shell (120); an outer air inlet (111) and an outer air outlet (112) are formed on the outer shell (110); an inner air inlet (121) and an inner air outlet (122) are respectively formed at two ends of the inner shell (120); a reaction chamber (123) is formed on the inner side of the inner shell (120); the spiral flow channel (140) is arranged on the outer side of the inner shell (120) and the inner side of the outer shell (110); the control rod (130) is rotatably arranged on the side wall of the inner shell (120) and is located on the inner side of the outer shell (110); the control rod (130) has a control area (131) and a non-control area (132); and the spiral flow channel (140) is arranged between the inner shell (120) and the outer shell (110); The outer air inlet (111) is used to input cooling gas, so that the cooling gas passes through the inner air inlet (121), the reaction chamber (123), the inner air outlet (122) and the spiral flow channel (140) in sequence, and is then discharged from the outer air outlet (112). The cooling gas is used to flow along the spiral flow channel (140) and cause the control rod (130) to rotate, so as to drive the control area (131) to move into or out of the reaction chamber (123).

2. The self-adjusting shielding and heat preservation device for a micro-pile according to claim 1, characterized in that: A top plate (124) is formed at the top end of the inner shell (120), the top plate (124) is abutted against the inner wall of the outer shell (110), the top plate (124) is arranged to protrude from the side wall of the inner shell (120), the inner air inlet (121) is opened on the top plate (124), the outer air inlet (111) is arranged higher than the top plate (124), and the outer air outlet (112) is arranged lower than the top plate (124).

3. The self-regulating shielding and heat preservation device for a micro-pile according to claim 2, characterized in that: The top plate (124) is used to separate the outer shell (110) and the outer shell (110) into an air intake chamber (113) and a heat preservation chamber (114), and the spiral flow channel (140) is accommodated in the heat preservation chamber (114).

4. The self-adjusting shielding and heat preservation device for a micro-pile according to any one of claims 1 to 3, characterized in that: A bottom plate (125) is formed at the bottom end of the inner shell (120), the bottom plate (125) protrudes from the side wall of the inner shell (120) and is spaced apart from the inner wall of the outer shell (110), and the inner air outlet (122) is opened on the bottom plate (125).

5. The self-adjusting shielding and heat preservation device for a micro-pile according to any one of claims 1 to 3, characterized in that: The inner wall of the spiral flow channel (140) is connected to the outer wall of the inner shell (120), and the control rod (130) is rotatably arranged on the inner side of the spiral flow channel (140).

6. The self-adjusting shielding and heat preservation device for a micro-pile according to any one of claims 1 to 3, characterized in that: The control area (131) and the non-control area (132) are symmetrically arranged and extend along the axial direction of the control rod (130).

7. The self-adjusting shielding and heat preservation device for a micro-pile according to any one of claims 1 to 3, characterized in that: The number of the control rods (130) is at least three, and the at least three control rods (130) are evenly arranged along the circumference of the inner casing (120).

8. The self-adjusting shielding and heat preservation device for a micro-pile according to any one of claims 1 to 3, characterized in that: The inner air inlet (121) is circular or strip-shaped, and the inner air outlet (122) is circular.

9. The self-adjusting shielding and heat preservation device for a micro-pile according to any one of claims 1 to 3, characterized in that: The external air inlet (111) is circular, and the external air outlet (112) is circular.

10. An operating method of a self-regulating shielding and heat preservation device for a micro-pile, characterized in that: The self-regulating shielding and heat preservation device for a micro-pile is implemented by any one of claims 1 to 9, and the operation method of the self-regulating shielding and heat preservation device for a micro-pile comprises: Controlling the cooling gas to enter the reaction chamber (123) through the outer air inlet hole (111) and the inner air inlet hole (121) to absorb heat; Controlling the cooling gas after absorbing heat to pass through the inner gas outlet hole (122) and flow along the spiral flow channel (140); Controlling the control rod (130) to rotate under the action of the cooling gas, and driving the control area (131) to rotate into or out of the reaction chamber (123); The cooling gas is controlled to pass through the outgoing air hole (112).

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