Self-adjusting shielding heat preservation device for micro reactor and operation method of self-adjusting shielding heat preservation device

Abstract

The embodiment of the invention provides a self-adjusting shielding heat preservation device for a micro reactor and an operation method of the self-adjusting shielding heat preservation device, and relates to the field of nuclear reactors. The reactor comprises an outer shell, an inner shell, a control rod and a spiral flow channel, the inner shell is sleeved with the outer shell, an outer air inlet hole and an outer air outlet hole are formed in the outer shell, an inner air inlet hole and an inner air outlet hole are formed in the inner shell, a reaction cavity is formed in the inner side of the inner shell, and the spiral flow channels are arranged on the outer side of the inner shell and the inner side of the outer shell. The control rod is rotatably arranged on the side wall of the inner shell in a penetrating mode and located on the inner side of the outer shell, the control rod is provided with a control area and a non-control area, and the spiral runner is arranged between the inner shell and the outer shell; the outer gas inlet hole is used for inputting cooling gas, so that the cooling gas sequentially passes through the inner gas inlet hole, the reaction chamber, the inner gas outlet hole and the spiral flow channel and then is discharged from the outer gas outlet hole, and the cooling gas is used for flowing along the spiral flow channel and enabling the control rod to rotate so as to drive the control region to rotate into or out of the reaction chamber.

Description

Technical Field

[0001] The invention relates to the field of nuclear reactors, and in particular to a self-regulating shielding and heat preservation device for a micro reactor and an operating method thereof. Background Art

[0002] During the nuclear reaction operation of a micro reactor, a driving mechanism is usually provided to drive the control rods to move so as to achieve dynamic regulation of the reaction process of the reactor.

[0003] In order to facilitate the movement of the control rods, the control rods are usually extended 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 preservation device for a micro reactor and an operating method thereof, which can enable a control rod to be located inside an outer shell, thereby reducing heat leakage and achieving a better heat preservation effect.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the present invention provides a self-regulating shielding and heat preservation device for a micro-pile, which comprises:

[0007] Outer casing, inner casing, control rods and spiral flow channel;

[0008] The outer shell is sleeved on the outer side of the inner shell, an outer air inlet and an outer air outlet are formed on the outer shell, an inner air inlet and an inner air outlet are formed at two ends of the inner shell respectively, a reaction chamber is formed on the inner side of the inner shell, the spiral flow channel is arranged on the outer side of the inner shell and the inner side of the outer shell, the control rod is rotatably arranged on the side wall of the inner shell and located on the inner side of 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 is used to input cooling gas, so that the cooling gas passes through the inner air inlet, the reaction chamber, the inner air outlet and the spiral flow channel in sequence, and is then discharged from the outer air outlet. The cooling gas is used to flow along the spiral flow channel and cause the control rod to rotate, so as to drive the control area to move 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 is abutted against the inner wall of the outer shell, the top plate protrudes from the side wall of the inner shell, the inner air inlet is opened on the top plate, the outer air inlet is higher than the top plate, and the outgoing air hole is lower than the top plate.

[0011] Optionally, the top plate is used to separate the outer shell and the outer shell into an air intake chamber and a heat preservation chamber, and the spiral flow channel is accommodated in the heat preservation chamber.

[0012] Optionally, a bottom plate is formed at the bottom end of the inner shell, the bottom plate is protruding from the side wall of the inner shell and is spaced apart from the inner wall of the outer shell, and the inner air outlet is opened on the bottom plate.

[0013] Optionally, the inner wall of the spiral flow channel is connected to the outer wall of the inner shell, and the control rod is rotatably disposed on the inner side of the spiral flow channel.

[0014] Optionally, the control zone and the non-control zone 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 circumference of the inner casing.

[0016] Optionally, the inner air inlet is circular or elongated, and the inner air outlet is circular.

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

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

[0019] Controlling the cooling gas to enter the reaction chamber through the outer air inlet hole and the inner air inlet hole to absorb heat;

[0020] Controlling the cooling gas after absorbing heat to pass through the inner air outlet and flow 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 rotate into or out of the reaction chamber;

[0022] The cooling gas is controlled to pass through the outgoing air hole.

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

[0024] The self-regulating shielding and heat-insulating device for a micro reactor comprises an outer shell, an inner shell, a control rod and a spiral flow channel; wherein, the outer shell is sleeved on the outer side of the inner shell, an outer air inlet and an outer air outlet are formed on the outer shell, inner air inlet and inner air outlet are respectively formed at two ends of the inner shell, a reaction chamber is formed on the inner side of the inner shell, the spiral flow channel is arranged on the outer side of the inner shell and the inner side of the outer shell, the control rod is rotatably arranged on the side wall of the inner shell and is located on the inner side of 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 is used to input cooling gas, so that the cooling gas passes through the inner air inlet, the reaction chamber, the inner air outlet and the spiral flow channel in sequence, and then is discharged from the outer air outlet, the cooling gas is used to flow along the spiral flow channel, and the control rod is rotated to drive the control area to move into or out of the reaction chamber. During operation, the cooling gas can absorb heat in the reaction chamber and then flow along the spiral flow channel. The flow of the cooling gas after absorbing heat 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 dynamic adjustment of the reaction process; and in this process, the control rod is located on the inner side of the outer shell, thereby reducing heat leakage and achieving better thermal insulation 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 certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the external structure of a self-regulating shielding and heat preservation device for a micro-pile provided in an embodiment of the present invention;

[0027] Figure 2 It is a cross-sectional schematic diagram of a self-adjusting shielding and heat-insulating device for a micro-pile provided in an embodiment of the present invention at a first viewing angle;

[0028] Figure 3 It is a cross-sectional schematic diagram of a self-adjusting shielding and heat-insulating device for a micro-pile provided in an embodiment of the present invention at a second viewing angle;

[0029] Figure 4 It is a schematic diagram of the internal structure of the self-adjusting shielding and heat-insulating device for a micro-pile provided in an embodiment of the present invention from a third viewing angle;

[0030] Figure 5 It is a schematic diagram of the internal structure of the self-adjusting shielding and heat-insulating device for a micro-pile provided in an embodiment of the present invention at a fourth viewing angle.

[0031] Icons: 100 - self-regulating shielding and insulation device for micro reactor; 110 - outer shell; 111 - external air inlet; 112 - external air outlet; 113 - air inlet chamber; 114 - insulation chamber; 120 - inner shell; 121 - internal air inlet; 122 - internal air outlet; 123 - reaction chamber; 124 - top plate; 125 - bottom plate; 130 - control rod; 131 - control area; 132 - non-control area; 140 - spiral flow channel. DETAILED DESCRIPTION

[0032] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the 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 invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0037] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0038] Unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of 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, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0040] As mentioned in the background art, during the nuclear reaction operation of a micro reactor, a driving mechanism is usually set to drive the control rod to move, so as to achieve dynamic adjustment of the reaction process of the reactor. In order to facilitate the movement of the control rod, the control rod is usually extended to the outside of the outer shell, which leads to heat leakage.

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

[0042] refer to Figure 2-Figure 4 The self-regulating shielding and heat preservation 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] 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, a spiral flow channel 140 is arranged on the outer side of the inner shell 120 and the inner side of the outer shell 110, a control rod 130 is rotatably arranged on the side wall of the inner shell 120 and 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;

[0044] 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, thereby driving the control area 131 to move into or out of the reaction chamber 123.

[0045] During operation, the cooling gas can absorb heat in the reaction chamber 123 and then flow along the spiral flow channel 140. The flow of the cooling gas after absorbing heat drives the control rod 130 to rotate relative to the inner shell 120, so that the volume of the control area 131 in the reaction chamber 123 increases or decreases, thereby realizing dynamic adjustment of the reaction process; and in this process, the control rod 130 is located on the inner side of the outer shell 110, thereby 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 adjusting the reaction power. When the control area 131 is located in the reaction chamber 123, the power of the reactor is smaller; when the control area 131 is located in the reactor, the power of the reactor is greater.

[0047] Normally, half of the volume of the control zone 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 it flows 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: pV = nRT (where p is pressure, V is gas volume, n is the amount of gas substance, R is the molar gas constant, and T is temperature)]. At this time, the cooling gas will push the control rod 130 to rotate, so that more volume of the control zone 131 is transferred into the reaction chamber 123, thereby reducing the reaction power. In addition, the adjustment process can achieve 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 regulation efficiency, the temperature and pressure of the cooling gas can be regulated by adjusting the charging rate and flow rate of the cooling gas, thereby adjusting the relative rotation rate and reaction power of the control rod 130.

[0049] In this embodiment, the outer shell 110 is a capsule-like structure with hemispherical ends. Only an external air inlet 111 and an external air outlet 112 are provided on the outer shell 110. The control rod 130 does not penetrate the outer shell 110, so the heat leakage positions on the outer shell 110 are reduced, thereby improving the thermal insulation effect of the overall reactor.

[0050] refer to Figure 2-Figure 4 The number of control rods 130 is at least three, and at least three control rods 130 are evenly arranged along the circumference of the inner shell 120. In this embodiment, the number of control rods 130 is nine; of course, in other embodiments of the present invention, the number of control rods 130 can also be two, three, five, eight, twelve, etc., and there is no limitation on the specific number of control rods 130.

[0051] Furthermore, each control rod 130 is in the shape of a round rod, 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 the control area 131 and the non-control area 132 are both semicircular rod-shaped structures of equal size.

[0052] refer to Figure 2-Figure 4 A top plate 124 is formed at the top of the inner shell 120, the top plate 124 is abutted against the inner wall of the outer shell 110, the top plate 124 protrudes 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 higher than the top plate 124, and the outgoing air hole 112 is lower than the top plate 124.

[0053] Furthermore, 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 .

[0054] During the gas inlet and outlet process, the cooling gas first enters the gas inlet chamber 113 through the outer gas inlet hole 111, then enters the reaction chamber 123 through the inner gas inlet hole 121, fully absorbs the heat generated by the nuclear reaction in the reaction chamber 123, then enters the heat preservation chamber 114 through the inner gas outlet hole 122, flows along the spiral flow channel 140, and finally flows out from the outer gas outlet 112. The overall flow path of the cooling gas can be regarded as a U-shape, and the path length of one end (gas inlet direction) of the U-shape is longer than the path length of the other end (gas outlet direction).

[0055] It is worth noting that by forming the heat-insulating chamber 114, the heat-insulating effect of the reaction chamber 123 can be achieved when the control rod 130 is rotationally driven by the flowing cooling gas, so that the cooling gas can only be discharged through the outgoing air hole 112, and there is no leakage through other gaps, thereby reducing heat leakage and improving the heat-insulating effect of the reaction chamber 123.

[0056] In the present embodiment, the external air inlet holes 111 are circular, the number of the external air inlet holes 111 is four, and the four external air inlet holes 111 are evenly distributed along the circumference of the outer shell 110; of course, in other embodiments of the present invention, the external air inlet holes 111 can also be long strips, triangles, sectors, rectangles, etc., and the number can also be one, three, five, eight, etc., and there is no limitation on the specific shape and specific number of the external air inlet holes 111.

[0057] In the present embodiment, the outgoing air holes 112 are circular, the number of the outgoing air holes 112 is four, and the four outgoing air holes 112 are evenly distributed along the circumference of the outer shell 110; of course, in other embodiments of the present invention, the outgoing air holes 112 can also be long strips, triangles, sectors, rectangles, etc., and the number can also be one, three, five, eight, etc., and there is no limitation on the specific shape and specific number of the outgoing air holes 112.

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

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

[0060] refer to Figure 3-Figure 5 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. The inner air outlet 122 is opened on the bottom plate 125 so that the cooling gas can quickly change direction when passing through the inner air outlet 122 to flow in a spiral along the spiral flow channel 140.

[0061] refer to Figure 3-Figure 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 shell 120, and the control rod 130 can be rotatably arranged on the inner side of the spiral flow channel 140.

[0062] The embodiment of the present invention further provides an operating method of a self-regulating shielding and heat preservation device for a micro-pile, which is implemented by a self-regulating shielding and heat preservation device 100 for a micro-pile. The operating method of the self-regulating shielding and heat preservation device for a micro-pile 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 to absorb heat;

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

[0065] Step S300: 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;

[0066] Step S400 : controlling the cooling gas to pass through the outgoing air hole 112 .

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

[0068] (1) The self-regulating shielding and heat preservation device 100 for a micro reactor can guide the cooling gas after absorbing heat to flow through the spiral flow channel 140, thereby generating thrust on the control rod 130, so that the control rod 130 rotates relative to the inner shell 120, and the volume of the control area 131 located in the reaction chamber 123 changes, thereby achieving the operation of adjusting the reaction power.

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

[0070] (3) The self-regulating shielding and heat preservation device 100 for the micro-reactor can guide the flow of the cooling gas after absorbing heat through the spiral flow channel 140, thereby extending the path of the cooling gas after absorbing heat flowing out of the outer shell 110, increasing the time that the heat stays in the heat preservation chamber 114, and thereby improving the heat preservation effect on the reaction chamber 123.

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

[0072] The above is only a specific embodiment 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 a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

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-adjusting 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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