Heat preservation device of directly-buried steam pipeline

Abstract

The utility model relates to the technical field of steam pipelines, in particular to a heat preservation device of a directly-buried steam pipeline, which comprises a working pipe, heat preservation cotton sleeved on the working pipe, an outer protection pipe sleeved on the heat preservation cotton, a channel arranged between the outer protection pipe and the heat preservation cotton, and elastic units uniformly arranged along the length direction of the channel. The device has the advantages that when the heat preservation cotton droops, the translation assembly is automatically triggered to move horizontally, the limiting effect on the two sliding block sets is relieved, meanwhile, the translation plate and the sleeving plate form a whole, and in the descending process of the heat preservation cotton, the heat preservation cotton is fixed through the whole formed by the translation plate and the sleeving plate. The two sliding block sets are driven to move to achieve upward-supporting anti-falling of the heat preservation cotton at the lowest position, the rotating abutting assembly is synchronously driven to rotate, the fixing effect on the heat preservation cotton on the two sides of the upward-supporting anti-falling heat preservation cotton on the lower half section is achieved, and the double anti-falling effect on the heat preservation cotton is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam pipelines, in particular to a heat preservation device for directly buried steam pipelines. Background Art

[0002] With the continuous expansion of the scale of centralized heating, the pipeline transportation distance of the direct buried steam pipeline network is also increasing, resulting in an increase in the overall heat loss of the direct buried steam pipeline. In this case, the thermal insulation performance of the pipeline has become an important indicator affecting the efficiency of the heating pipeline network system.

[0003] The traditional soft insulation layer has the disadvantage of poor compressive resistance. After being subjected to gravity for a long time, the thicker soft insulation layer is prone to sagging. This will cause the insulation performance of the direct-buried steam pipeline to decline, increase heat loss, and reduce the economic benefits of the entire system. Therefore, the traditional soft insulation structure has the problem of rapid decline in insulation performance and short service life. Summary of the invention

[0004] In view of the above problems or problems existing in the prior art, the present utility model is proposed.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a heat preservation device for a directly buried steam pipeline, comprising a working pipe, heat preservation cotton sleeved on the working pipe, an outer protective pipe sleeved on the heat preservation cotton, a channel is provided between the outer protective pipe and the heat preservation cotton, and elastic units are uniformly arranged along the length direction of the channel, wherein the elastic units are arranged in a circumferential array along the cross-sectional direction of the working pipe;

[0006] The anti-falling units are evenly arranged along the length direction of the channel, and are used to reduce the sagging force of the thermal insulation cotton.

[0007] As a preferred solution of the insulation device of the direct buried steam pipeline of the utility model, wherein: the elastic unit includes a first telescopic rod having one end fixedly connected to the inner wall of the outer protective tube, a connecting plate fixedly connected to the other end of the first telescopic rod, a first arc block fixedly connected to the connecting plate, and a first spring connecting the outer protective tube and the connecting plate;

[0008] The first spring is wound around the first telescopic rod.

[0009] As a preferred solution of the insulation device of the direct buried steam pipeline of the utility model, the anti-falling unit includes a driving component, a driven component driven by the driving component, a translation component driven by the elastic unit, a connecting component connecting the driven component and the translation component, and a rotating pressing component driven by the driven component;

[0010] The driven component is arranged in parallel with the translation component.

[0011] As a preferred solution of the insulation device of the direct-buried steam pipeline of the utility model, the driving assembly includes a second telescopic rod with one end fixedly connected to the inner wall of the outer protective tube, a clamping plate fixedly connected to the other end of the second telescopic rod, a T-block fixedly connected to the upper surface of the clamping plate, and a second spring connecting the outer protective tube and the clamping plate, wherein the upper surface of the T-block is an arc-shaped surface, and the second spring is wound around the second telescopic rod.

[0012] As a preferred solution of the insulation device of the direct buried steam pipeline of the utility model, the driven component includes two fixed columns with one end fixedly connected to the inner wall of the outer protective pipe, a sleeve plate sleeved on the two fixed columns at the same time, a third spring connecting the lower surface of the sleeve plate and the inner wall of the outer protective pipe, a driven member driven to move by the driving component, and a limiter for limiting the position of the driven member;

[0013] The two fixing columns are arranged in parallel.

[0014] As a preferred solution of the insulation device for directly buried steam pipelines of the utility model, the driven member comprises two sets of sliders symmetrically arranged with respect to the axis of the second telescopic rod;

[0015] Each slider group includes a first slider, a second slider, a third slider, and a plurality of fixed horizontal columns whose one ends are fixedly connected to the first slider, the second slider, and the third slider, respectively, wherein the upper surfaces of the first slider, the second slider, and the third slider are all arc surfaces.

[0016] As a preferred solution of the insulation device of the direct buried steam pipeline of the utility model, the limiting member includes two fixed plates with one end fixedly connected to the inner wall of the outer protective pipe, horizontal holes evenly arranged on the sleeve plate, vertical holes connected to all the horizontal holes, a limiting plate movably inserted in the sleeve plate, a movable column with one end fixedly connected to the limiting plate, and two third telescopic rods connecting the limiting plate and the two fixed plates;

[0017] The limit block moves horizontally along the horizontal hole, and the two fixed plates are both arranged parallel to the sleeve plate.

[0018] As a preferred solution of the insulation device of the direct-buried steam pipeline of the utility model, the translation assembly includes a first inclined block fixedly connected to the side wall of the connecting plate, a group of parallel plates fixedly connected to the inner wall of the outer protective tube, a translation plate arranged above the group of parallel plates and facing the sleeve plate, a second inclined block fixedly connected to the side wall of the translation plate, a plurality of inclined holes evenly arranged on the translation plate and facing a plurality of fixed horizontal columns, and a fourth spring connecting the lower surface of the translation plate and the inner wall of the outer protective tube.

[0019] As a preferred solution of the insulation device for the directly buried steam pipeline of the utility model, the two push columns of the connecting assembly are fixedly connected to the upper end of the translation plate, a fourth telescopic rod horizontally connecting the translation plate and the sleeve plate, a first magnet fixedly connected to the translation plate, and a second magnet facing the first magnet and fixedly connected to the sleeve plate;

[0020] The two push columns are respectively opposite to the two movable columns.

[0021] As a preferred solution of the heat preservation device for directly buried steam pipelines of the utility model, wherein: two groups of rotating pressing components are provided, and are symmetrically arranged with respect to the axis of the second telescopic rod;

[0022] The rotating pressing assembly includes a group of parallel arc plates fixedly connected to the inner wall of the outer protective tube, a fixed connecting plate connecting the two parallel arc plates, a rotating plate axially connected to the two parallel arc plates, a through hole penetrating the group of parallel arc plates, a through rod penetrating the two through holes, an arc block sliding along the parallel arc plates, a sliding groove penetrating the arc block, a rotating block fixedly connected to the rotating plate at one end, a sliding rod fixedly connected to the other end of the rotating block, and a pull rope connecting the through rod and the second sliding block;

[0023] One end of the arc block is fixedly connected to the through rod, and the sliding rod moves along the sliding groove.

[0024] The beneficial effects of the utility model are as follows: when the thermal insulation cotton sags, the horizontal movement of the translation assembly is automatically triggered to release the limiting effect on the two groups of slider groups. At the same time, the translation plate and the sleeve plate form a whole. During the descending process of the thermal insulation cotton, the whole formed by the translation plate and the sleeve plate drives the two groups of slider groups to move to achieve "upward support" to prevent the thermal insulation cotton at the lowest point from falling, and simultaneously drives the rotating pressure assembly to rotate, thereby achieving the fixing effect on the thermal insulation cotton on both sides of the lower half except the thermal insulation cotton that has achieved "upward support" to prevent falling, thereby achieving a double anti-falling effect on the thermal insulation cotton. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0026] Figure 1 This is a schematic diagram of the overall structure of the insulation device for the direct buried steam pipeline.

[0027] Figure 2 It is a schematic diagram of some structures.

[0028] Figure 3 It is a rear view schematic diagram of part of the structure.

[0029] Figure 4 A schematic side view of a portion of the structure. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example

[0034] Reference Figure 1 to Figure 4 , is an embodiment of the utility model, which provides a heat preservation device for a directly buried steam pipeline, comprising a working pipe 101, a heat preservation cotton 102 sleeved on the working pipe 101, an outer protective pipe 103 sleeved on the heat preservation cotton 102, a channel 104 is provided between the outer protective pipe 103 and the heat preservation cotton 102, and elastic units 200 are uniformly arranged along the length direction of the channel 104, wherein the elastic units 200 are arranged in a circumferential array along the cross-sectional direction of the working pipe 101;

[0035] The anti-falling units 300 are evenly arranged along the length direction of the channel 104 . The anti-falling units 300 are used to reduce the drooping force of the thermal insulation cotton 102 . The anti-falling units 300 are arranged at intervals between the elastic units 200 .

[0036] Further, the elastic unit 200 includes a first telescopic rod 201 having one end fixedly connected to the inner wall of the outer protective tube 103, a connecting plate 202 fixedly connected to the other end of the first telescopic rod 201, a first arc block 305f203 fixedly connected to the connecting plate 202, and a first spring 204 connecting the outer protective tube 103 and the connecting plate 202, wherein the elastic unit 200 is used to meet the expansion and contraction of the working tube 101 during normal use;

[0037] The first spring 204 is wound around the first telescopic rod 201 .

[0038] Further, the anti-falling unit 300 includes a driving assembly 301, a driven assembly 302 driven by the driving assembly 301, a translation assembly 303 driven by the elastic unit 200, a connecting assembly 304 connecting the driven assembly 302 and the translation assembly 303, and a rotation pressing assembly 305 driven by the driven assembly 302;

[0039] The driven assembly 302 and the translation assembly 303 are arranged in parallel.

[0040] It should be noted that when the thermal insulation cotton 102 sags, the thermal insulation cotton 102 will be separated from the lower half of the working tube 101, thereby affecting its use effect, and the anti-falling unit 300 is used to "support" this part of the thermal insulation cotton 102.

[0041] Furthermore, the driving assembly 301 includes a second telescopic rod 301a having one end fixedly connected to the inner wall of the outer protective tube 103, a locking plate 301b fixedly connected to the other end of the second telescopic rod 301a, a T-block 301c fixedly connected to the upper surface of the locking plate 301b, and a second spring 301d connecting the outer protective tube 103 and the locking plate 301b, wherein the upper surface of the T-block 301c is an arc-shaped surface, the second spring 301d is wound around the second telescopic rod 301a, and the T-block 301c can only be vertically lifted and lowered along the vertically arranged second telescopic rod 301a.

[0042] Furthermore, the driven component 302 includes two fixed columns 302a, one end of which is fixedly connected to the inner wall of the outer protective tube 103, a sleeve plate 302b sleeved on the two fixed columns 302a, a third spring 302c connecting the lower surface of the sleeve plate 302b and the inner wall of the outer protective tube 103, a driven member 302d driven to move by the driving component 301, and a limiting member 302e for limiting the driven member 302d.

[0043] The two fixing columns 302a are arranged in parallel, wherein the two fixing columns 302a are arranged perpendicular to the working tube 101, and the sleeve plate 302b can only move vertically up and down along the two fixing columns 302a.

[0044] Further, the follower 302d includes two sets of slider groups 302d-1 symmetrically arranged with respect to the axis of the second telescopic rod 301a;

[0045] Each group of slider groups 302d-1 includes a first slider 302d-11, a second slider 302d-12, a third slider 302d-13, and a plurality of fixed horizontal columns 302d-14, one end of which is fixedly connected to the first slider 302d-11, the second slider 302d-12, and the third slider 302d-13, respectively, wherein the upper surfaces of the first slider 302d-11, the second slider 302d-12, and the third slider 302d-13 are all arc surfaces, wherein the first slider 302d-11 to the third slider 302d-13 gradually increase in height from the center to both sides of the working tube 101, and the arc surfaces of the upper surfaces of the two groups of slider groups 302d-1 are concentrically arranged, and the arc surfaces are adapted to the working tube 101 and the thermal insulation cotton 102.

[0046] It should be noted that the two sets of slider groups 302d-1 move linearly along the slide groove (not shown in the figure) on the inner wall of the outer protective tube 103.

[0047] Further, the limiting member 302e includes two fixed plates 302e-1 with one end fixedly connected to the inner wall of the outer protective tube 103, horizontal holes 302e-2 uniformly arranged on the sleeve plate 302b, vertical holes 302e-3 connected to all the horizontal holes 302e-2, a limiting plate 302e-4 movably inserted in the sleeve plate 302b, a movable column 302e-5 with one end fixedly connected to the limiting plate 302e-4, and two third telescopic rods 302e-6 connecting the limiting plate 302e-4 and the two fixed plates 302e-1, wherein the horizontal holes 302e-2 are uniformly arranged on both sides of each slider, and the sleeve plate 302b is engaged with the engaging plate 301b;

[0048] The limiting block moves horizontally along the horizontal hole 302e-2, and the two fixing plates 302e-1 are both arranged parallel to the sleeve plate 302b.

[0049] It should be noted that, in the initial state, the two sets of slider groups 302d-1 do not move due to the cooperation of the limiting plate 302e-4 and the sliding groove.

[0050] Furthermore, the translation assembly 303 includes a first inclined block 303a fixedly connected to the side wall of the connecting plate 202, a group of parallel plates 303b fixedly connected to the inner wall of the outer protective tube 103, a translation plate 303c arranged above the group of parallel plates 303b and facing the sleeve plate 302b, a second inclined block 303d fixedly connected to the side wall of the translation plate 303c, a plurality of inclined holes 303e evenly arranged on the translation plate 303c and facing a plurality of fixed horizontal columns 302d-14, and a fourth spring 303f connecting the lower surface of the translation plate 303c and the inner wall of the outer protective tube 103, wherein the parallel plate 303b is provided with a card slot adapted to the locking plate 301b.

[0051] It should be noted that when the thermal insulation cotton 102 sags, the first inclined block 303a presses down the second inclined block 303d to push the translation plate 303c to move horizontally along a group of parallel plates 303b.

[0052] Further, the connecting assembly 304 includes two push posts 304a fixedly connected to the upper end of the translation plate 303c, a fourth telescopic rod 304b horizontally connecting the translation plate 303c and the sleeve plate 302b, a first magnet 304c fixedly connected to the translation plate 303c, and a second magnet 304d facing the first magnet 304c and fixedly connected to the sleeve plate 302b;

[0053] The two pushing posts 304a are respectively opposite to the two movable posts 302e-5.

[0054] It should be noted that during the horizontal movement of the translation plate 303c, the fourth telescopic rod 304b contracts, and under the magnetic force of the first magnet 304c and the second magnet 304d, the translation plate 303c and the sleeve plate 302b are connected, the locking plate 301b and the translation plate 303c are locked, and the fixed horizontal column 302d-14 is correspondingly penetrated in the inclined hole 303e. At the same time, the pushing column 304a squeezes the movable column 302e-5, driving the third telescopic rod 302e-6 to contract, and the limiting plate 302e-4 moves horizontally along the horizontal hole 302e-2, thereby releasing the limiting effect of the limiting plate 302e-4 on the two sets of slider groups 302d-1.

[0055] Furthermore, the rotating pressing assembly 305 is provided with two groups, and is symmetrically arranged with respect to the axis of the second telescopic rod 301a;

[0056] The rotating pressing assembly 305 includes a group of parallel arc plates 305a fixedly connected to the inner wall of the outer protective tube 103, a fixed connecting plate 305b connecting the two parallel arc plates 305a, a rotating plate 305c axially connected to the two parallel arc plates 305a, a through hole 305d penetrating a group of parallel arc plates 305a, a through rod 305e penetrating two through holes 305d, an arc block 305f sliding along the parallel arc plates 305a, a sliding groove 305g penetrating the arc block 305f, a rotating block 305h fixedly connected to the rotating plate 305c at one end, a sliding rod 305i fixedly connected to the other end of the rotating block 305h, and a pull rope 305j connecting the through rod 305e and the second slider 302d-12, wherein a friction material is provided between the through rod 305e and the through hole 305d, and the through rod 305e and the through hole 305d remain relatively still without external force;

[0057] One end of the arc block 305f is fixedly connected to the through rod 305e, and the sliding rod 305i moves along the sliding groove 305g.

[0058] It should be noted that when the thermal insulation cotton 102 droops and presses down the T-block 301c, the T-block 301c moves vertically downward along the second telescopic rod 301a, and at the same time drives the sleeve plate 302b and the translation plate 303c to move vertically downward along the two fixed columns 302a, and the fixed horizontal column 302d-14 moves along the inclined hole 303e, driving the two groups of sliding groups to move horizontally along the slide groove, and the second slider 302d-12 moves horizontally along the slide groove and drives the through rod 305e to move downward along the through hole 305d through the pull rope 305j. The through rod 305e pulls the arc block 305f to move along the parallel arc plate 305a, and moves along the slide groove through the sliding rod 305i to drive the rotating block 305h to rotate, and the rotating block 305h drives the rotating plate 305c to rotate, that is, the drooping thermal insulation cotton 102 is pressed by the rotating plate 305c, so as to achieve the fixing effect of the thermal insulation cotton 102 in the lower half.

[0059] Preferably, when the thermal insulation cotton 102 sags, the horizontal movement of the translation assembly 303 is automatically triggered to release the limiting effect on the two groups of slider groups 302d-1. At the same time, the translation plate 303c and the sleeve plate 302b form a whole. During the descent of the thermal insulation cotton 102, the whole formed by the translation plate 303c and the sleeve plate 302b drives the two groups of slider groups 302d-1 to move to achieve "upward support" to prevent the lowest thermal insulation cotton 102 from falling, and simultaneously drives the rotating pressing assembly 305 to rotate, thereby achieving a fixing effect on the thermal insulation cotton 102 on both sides of the lower half except for the thermal insulation cotton 102 that has achieved "upward support" to prevent falling, that is, achieving a double anti-falling effect on the thermal insulation cotton 102.

[0060] When in use, the utility model includes three use states:

[0061] In the first use state, the translation assembly 303 moves horizontally to release the limiting effect on the two sets of slider groups 302d-1. Specifically, when the thermal insulation cotton 102 begins to sag, the connecting plate 202 vertically descends along the first telescopic rod 201, and the first inclined block 303a descends to squeeze the second inclined block 303d to push the translation plate 303c to move horizontally along a set of parallel plates 303b. During the horizontal movement of the translation plate 303c, the fourth telescopic rod 304b contracts and moves between the first magnet 304c and the second magnet Under the magnetic force of 304d, the translation plate 303c and the sleeve plate 302b are connected to form a whole, and at the same time, the clamping plate 301b and the translation plate 303c are clamped, and the fixed horizontal column 302d-14 is correspondingly penetrated into the inclined hole 303e, and at the same time, the pushing column 304a squeezes the movable column 302e-5, driving the third telescopic rod 302e-6 to contract, and the limiting plate 302e-4 moves horizontally along the horizontal hole 302e-2, releasing the limiting effect of the limiting plate 302e-4 on the two sets of slider groups 302d-1;

[0062] In the second use state, the two sets of slider groups 302d-1 move horizontally to realize the anti-falling effect of "lifting up" the drooping thermal insulation cotton 102 at the lower end. Specifically, when the thermal insulation cotton 102 gradually droops, the drooping thermal insulation cotton 102 presses down and squeezes the T-block 301c, and the T-block 301c moves vertically downward along the second telescopic rod 301a, and at the same time drives the sleeve plate 302b and the translation plate 303c to move vertically downward along the two fixed columns 302a, and the fixed horizontal column 302d-14 moves along the inclined hole 303e, driving the two sets of sliding groups to move horizontally along the slide groove to realize the "lifting up" effect on the lower end thermal insulation cotton 102, that is, realizing the first layer of anti-falling effect on the thermal insulation cotton 102;

[0063] In the third usage state, the second slider 302d-12 moves horizontally to drive the rotating pressing assembly 305 to rotate, thereby realizing the fixing effect of the thermal insulation cotton 102 on both sides of the thermal insulation cotton 102 that has been "lifted up" through the rotating plate 305c. Specifically, when the second slider 302d-12 moves horizontally along the slide groove, the pull rope 305j drives the through rod 305e to move downward along the through hole 305d, and the through rod 305e pulls the arc block 305f to move along the parallel arc plate 305a, and the slide rod 305i moves along the slide groove to drive the rotating block 305h to rotate, and the rotating block 305h drives the rotating plate 305c to rotate, that is, the rotating plate 305c is used to press the drooping thermal insulation cotton 102, thereby realizing the fixing effect of the thermal insulation cotton 102 on both sides of the lower half except for the thermal insulation cotton 102 that has been "lifted up" to prevent falling, that is, realizing the second layer of anti-falling effect on the thermal insulation cotton 102.

[0064] In summary, the beneficial effect of the insulation device for a direct-buried steam pipeline of the utility model is that when the insulation cotton 102 sags, the translation component 303 is automatically triggered to move horizontally, and the limiting effect on the two groups of slider groups 302d-1 is released. At the same time, the translation plate 303c and the sleeve plate 302b form a whole, and during the descending process of the insulation cotton 102, the whole formed by the translation plate 303c and the sleeve plate 302b drives the two groups of slider groups 302d-1 to move to achieve "upward support" to prevent the lowest insulation cotton 102 from falling, and simultaneously drives the rotating pressure component 305 to rotate, thereby achieving the fixing effect on the insulation cotton 102 on both sides of the lower half except for the insulation cotton 102 that has achieved "upward support" to prevent falling, that is, achieving a double anti-falling effect on the insulation cotton 102.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A heat preservation device for a directly buried steam pipeline, characterized in that: include, A working tube (101), a heat-insulating cotton (102) sleeved on the working tube (101), an outer protective tube (103) sleeved on the heat-insulating cotton (102), a channel (104) being provided between the outer protective tube (103) and the heat-insulating cotton (102), and elastic units (200) being uniformly arranged along the length direction of the channel (104), wherein the elastic units (200) are arranged in a circular array along the cross-sectional direction of the working tube (101); The anti-falling unit (300) is evenly arranged along the length direction of the channel (104), and the anti-falling unit (300) is used to reduce the drooping force of the thermal insulation cotton (102).

2. The insulation device for a direct buried steam pipeline according to claim 1, characterized in that: The elastic unit (200) comprises a first telescopic rod (201) having one end fixedly connected to the inner wall of the outer protective tube (103), a connecting plate (202) fixedly connected to the other end of the first telescopic rod (201), a first arc block (305f) (203) fixedly connected to the connecting plate (202), and a first spring (204) connecting the outer protective tube (103) and the connecting plate (202); The first spring (204) is wound around the first telescopic rod (201).

3. The insulation device for a directly buried steam pipeline according to claim 2, characterized in that: The anti-falling unit (300) comprises a driving component (301), a driven component (302) driven by the driving component (301), a translation component (303) driven by the elastic unit (200), a connecting component (304) connecting the driven component (302) and the translation component (303), and a rotation pressing component (305) driven by the driven component (302); The driven component (302) and the translation component (303) are arranged in parallel.

4. The insulation device for a directly buried steam pipeline according to claim 3, characterized in that: The driving assembly (301) comprises a second telescopic rod (301a) having one end fixedly connected to the inner wall of the outer protective tube (103), a snap-fit ​​plate (301b) fixedly connected to the other end of the second telescopic rod (301a), a T-shaped block (301c) fixedly connected to the upper surface of the snap-fit ​​plate (301b), and a second spring (301d) connecting the outer protective tube (103) and the snap-fit ​​plate (301b), wherein the upper surface of the T-shaped block (301c) is an arc-shaped surface, and the second spring (301d) is wound around the second telescopic rod (301a).

5. The insulation device for a directly buried steam pipeline according to claim 4, characterized in that: The driven component (302) comprises two fixed columns (302a) one end of which is fixedly connected to the inner wall of the outer protective tube (103), a sleeve plate (302b) sleeved on the two fixed columns (302a), a third spring (302c) connecting the lower surface of the sleeve plate (302b) and the inner wall of the outer protective tube (103), a driven member (302d) driven to move by the driving component (301), and a limiting member (302e) for limiting the position of the driven member (302d); The two fixing columns (302a) are arranged in parallel.

6. The insulation device for a directly buried steam pipeline according to claim 5, characterized in that: The driven member (302d) comprises two groups of sliders (302d-1) symmetrically arranged about the axis of the second telescopic rod (301a); Each group of the slider groups (302d-1) comprises a first slider (302d-11), a second slider (302d-12), a third slider (302d-13), and a plurality of fixed horizontal columns (302d-14) one end of which is fixedly connected to the first slider (302d-11), the second slider (302d-12), and the third slider (302d-13), respectively, wherein the upper surfaces of the first slider (302d-11), the second slider (302d-12), and the third slider (302d-13) are all arc surfaces.

7. The heat preservation device for a directly buried steam pipeline according to claim 6, characterized in that: The limiting member (302e) comprises two fixed plates (302e-1) one end of which is fixedly connected to the inner wall of the outer protective tube (103), horizontal holes (302e-2) evenly arranged on the sleeve plate (302b), vertical holes (302e-3) connected to all the horizontal holes (302e-2), a limiting plate (302e-4) movably inserted in the sleeve plate (302b), a movable column (302e-5) one end of which is fixedly connected to the limiting plate (302e-4), and two third telescopic rods (302e-6) connecting the limiting plate (302e-4) and the two fixed plates (302e-1); The limit block moves horizontally along the horizontal hole (302e-2), and the two fixing plates (302e-1) are both arranged parallel to the sleeve plate (302b).

8. The heat preservation device for a directly buried steam pipeline according to claim 7, characterized in that: The translation assembly (303) includes a first inclined block (303a) fixedly connected to the side wall of the connecting plate (202), a group of parallel plates (303b) fixedly connected to the inner wall of the outer protective tube (103), a translation plate (303c) arranged above the group of parallel plates (303b) and facing the sleeve plate (302b), a second inclined block (303d) fixedly connected to the side wall of the translation plate (303c), a plurality of inclined holes (303e) evenly arranged on the translation plate (303c) and facing the plurality of fixed horizontal columns (302d-14), and a fourth spring (303f) connecting the lower surface of the translation plate (303c) and the inner wall of the outer protective tube (103).

9. The insulation device for a directly buried steam pipeline according to claim 8, characterized in that: The connecting assembly (304) comprises two pushing columns (304a) fixedly connected to the upper end of the translation plate (303c), a fourth telescopic rod (304b) horizontally connecting the translation plate (303c) and the sleeve plate (302b), a first magnet (304c) fixedly connected to the translation plate (303c), and a second magnet (304d) facing the first magnet (304c) and fixedly connected to the sleeve plate (302b); The two pushing columns (304a) are respectively opposite to the two movable columns (302e-5).

10. The heat preservation device for a directly buried steam pipeline according to claim 9, characterized in that: The rotating pressing components (305) are provided in two groups and are symmetrically arranged around the axis of the second telescopic rod (301a); The rotating pressing assembly (305) comprises a group of parallel arc plates (305a) fixedly connected to the inner wall of the outer protective tube (103), a fixed connecting plate (305b) connecting the two parallel arc plates (305a), a rotating plate (305c) axially connected to the two parallel arc plates (305a), a through hole (305d) penetrating the group of parallel arc plates (305a), a through rod (305e) penetrating the two through holes (305d), an arc block (305f) sliding along the parallel arc plates (305a), a sliding groove (305g) penetrating the arc block (305f), a rotating block (305h) fixedly connected to the rotating plate (305c) at one end, a sliding rod (305i) fixedly connected to the other end of the rotating block (305h), and a pull rope (305j) connecting the through rod (305e) and the second sliding block (302d-12); One end of the arc block (305f) is fixedly connected to the through rod (305e), and the sliding rod (305i) moves along the sliding groove (305g).

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