Power supply side high-temperature electrothermal heat storage heat pile structure

Abstract

The application discloses a power supply side high-temperature electric heat storage heat pile structure, which comprises a heat storage unit, wherein the heat storage unit comprises a heat storage chamber, the heat storage chamber is internally provided with heat storage bricks, the heat storage chamber is provided with an opening, and the opening is connected with a heat delivery pipe; a connecting unit comprises a connecting piece connected with the heat delivery pipe and a joint connected with the connecting piece; the connecting piece is provided with a first channel penetrating through the connecting piece, one end of the first channel connected with the joint is provided with an annular boss, a plurality of evenly distributed hinged seats are arranged on the side of the annular boss, a triangular plate is hinged to the hinged seats, and elastic sheets are arranged between the triangular plate and the side of the first channel; the connecting unit is arranged in the whole device, the pipeline is completely sealed before being connected, and the risk of leakage does not exist; when the pipeline transmits heat, the heat greater than the demand can be automatically discharged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat storage heat pile, in particular to a power supply side high-temperature electric heat storage heat pile structure. BACKGROUND

[0002] At present, there are many manufacturers in China to supply solid heat storage boiler products, which have certain market reputation and performance, and occupy a certain market share.

[0003] According to the research and analysis, the products of these manufacturers generally only provide low index steam or hot water, and there are few successful cases in superheated steam and saturated steam. Even if a few try high-temperature (more than 700 degrees) heat storage technology, due to the quality of heat storage material, temperature control precision, load change and other reasons, the core heat pile work stability is not high, and because the design depth of temperature control is not enough, the core temperature of the heat pile is too large, which causes the heat storage material and the electric heating element to overheat and damage, and the heat pile collapses. There are many pipelines in the whole system, which is easy to leak heat, and the heat supply flow, temperature and speed are not stable due to the low stability of the heat pile, which may continue to heat in the case of high temperature and large flow, causing equipment failure and leading to project failure. SUMMARY

[0004] The purpose of this part is to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract and title of the specification to avoid obscuring the purpose of this part, the abstract and the title. Such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the above and / or problems existing in the prior art, the present application is proposed.

[0006] Therefore, the technical problem to be solved by the present application is that there are many pipelines in the whole system, which is easy to leak heat, and the heat supply flow, temperature and speed are not stable due to the low stability of the heat pile, which may continue to heat in the case of high temperature and large flow, causing equipment failure and leading to project failure.

[0007] To solve the above technical problems, the present application provides the following technical scheme: a power supply side high-temperature electric heat storage heat pile structure, comprising a heat storage unit, the heat storage unit comprises a heat storage chamber, the heat storage chamber is internally provided with heat storage bricks, the heat storage chamber is provided with an opening, the opening is connected with a heat supply pipe;

[0008] The connecting unit comprises a connecting piece connected with the heat supply pipe and a connector connected with the connecting piece.

[0009] The connecting piece is provided with a first channel penetrating through, and the end connected with the joint is provided with an annular boss, the side of the annular boss is provided with a plurality of evenly distributed hinged seats, the hinged seats are hinged with triangular plates, and the side of the first channel is provided with elastic sheets;

[0010] The joint is provided with an insertion end, and the insertion end is provided with a second channel penetrating through.

[0011] As a preferred scheme of the power supply side high-temperature electric heat storage heat pile structure, the first channel is provided with an annular disc, and the end of the first channel away from the triangular plate is provided with a first elastic member between the annular disc.

[0012] As a preferred scheme of the power supply side high-temperature electric heat storage heat pile structure, the side of the first channel is provided with a limiting groove, the side of the annular boss is provided with a positioning groove, a communication groove is arranged between the limiting groove and the positioning groove, the side of the annular disc is provided with an L-shaped rod, and the L-shaped rod is embedded in the limiting groove and the communication groove.

[0013] As a preferred scheme of the power supply side high-temperature electric heat storage heat pile structure, the positioning groove is provided with a positioning block, and a second elastic member is arranged between the positioning block and the positioning groove.

[0014] As a preferred scheme of the power supply side high-temperature electric heat storage heat pile structure, the end of the L-shaped rod is provided with a chamfer, and the side of the positioning block is provided with a recess hole.

[0015] The outer periphery of the insertion end is provided with a limiting ring groove.

[0016] The connecting piece is provided with a separation hole penetrating through to the positioning groove, and one end of the positioning block is provided with a separation rod penetrating through the separation hole.

[0017] As a preferred scheme of the power supply side high-temperature electric heat storage heat pile structure, the heat pipe and the connecting piece are connected through an adapter unit, the adapter unit comprises a safety pipe, and the two ends of the safety pipe are connected with the heat pipe and the connecting piece respectively; the safety pipe is provided with a first annular groove, the first annular groove is provided with a rotating piece, and the rotating piece is provided with a channel penetrating through.

[0018] The side of the first annular groove is provided with a first opening penetrating to the outside of the safety pipe, the side of the rotating piece is provided with a second opening penetrating through, the safety pipe is further provided with a second annular groove, and the safety pipe is provided with a moving piece, and the moving piece is provided with a through hole penetrating through.

[0019] As a preferred scheme of the power supply side high-temperature electric heat storage heat pile structure, the moving piece comprises a first section A located in the rotating piece and a second section B connected with the first section A.

[0020] The second segment B is located in the second annular groove and is provided with a limiting disc;

[0021] The third opening is arranged on the side of the second segment B, and the limiting disc is provided with a fourth opening.

[0022] As a preferred scheme of the power supply side high-temperature electrothermal heat storage heat pile structure, the inner side of the rotating member away from the second annular groove is provided with an axially extending guide groove, one end of the guide groove is connected with a spiral groove, and the outer side of the moving member is provided with a first boss embedded in the guide groove or the spiral groove.

[0023] As a preferred scheme of the power supply side high-temperature electrothermal heat storage heat pile structure, the side of the second annular groove is provided with an axially extending limiting groove, the side of the limiting disc is provided with a second boss embedded in the limiting groove.

[0024] As a preferred scheme of the power supply side high-temperature electrothermal heat storage heat pile structure, the second annular groove is provided with an adjusting ring, and an elastic member is arranged between the adjusting ring and the limiting disc. The outer periphery of the adjusting ring is provided with a third boss, the third boss passes through the limiting groove, the outer periphery of the safety pipe is provided with a third annular groove, the third annular groove is provided with a rotating ring, the rotating ring is provided with an internal thread, and the third boss is embedded in the groove formed by the internal thread.

[0025] The beneficial effects of the present application are that the connecting unit is arranged in the whole device, the pipeline is completely sealed before connection, and there is no risk of leakage; when the pipeline transmits heat, the heat greater than the demand will be automatically discharged. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0027] Figure 1 A schematic diagram of the power supply side high-temperature electrothermal heat storage heat pile structure according to an embodiment of the present application is provided.

[0028] Figure 2 A schematic diagram of the connecting member and the remaining structure of the power supply side high-temperature electrothermal heat storage heat pile structure according to an embodiment of the present application is provided.

[0029] Figure 3A schematic diagram of a joint in a power supply side high-temperature electrothermal heat storage heat stack structure according to an embodiment of the present application is shown in the figure;

[0030] Figure 4 An exploded structural schematic diagram of a connecting unit in a power supply side high-temperature electrothermal heat storage heat stack structure according to an embodiment of the present application is shown in the figure;

[0031] Figure 5 A structural schematic diagram of a connecting unit in a power supply side high-temperature electrothermal heat storage heat stack structure according to an embodiment of the present application is shown in the figure;

[0032] Figure 6 A structural schematic diagram of a connecting unit in a power supply side high-temperature electrothermal heat storage heat stack structure according to an embodiment of the present application is shown in the figure;

[0033] Figure 7 A structural schematic diagram of a connecting unit in a power supply side high-temperature electrothermal heat storage heat stack structure according to an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0034] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0035] In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0036] Secondly, the present application is described in detail in combination with the schematic diagram, and in the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is locally enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application herein. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual production.

[0037] Thirdly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0038] Embodiment 1

[0039] Reference Figures 1-5The embodiment provides a power supply side high-temperature electric heat storage heat pile structure, which comprises a heat storage unit 100 and a connecting unit 200, wherein the heat storage unit 100 comprises a heat storage chamber 101, the heat storage chamber 101 is internally provided with heat storage bricks 102, the heat storage bricks 102 store and generate high-temperature hot air, the heat storage chamber 101 is provided with an opening 101a, the opening 101a is connected with a heat delivery pipe 103, and the hot air enters a boiler through the opening 101a and the heat delivery pipe 103 to heat water to generate steam.

[0040] The connecting unit 200 comprises a connecting piece 201 connected with the heat delivery pipe 103 and a joint 202 connected with the connecting piece 201, and the joint 202 is connected to a boiler air inlet pipeline and detachably connected with the connecting piece 201.

[0041] The connecting piece 201 is provided with a first channel 201a penetrating through, one end of the first channel 201a connected with the joint 202 is provided with an annular boss 201b, the inner diameter of the annular boss 201b is smaller than the inner diameter of the first channel 201a, the side of the annular boss 201b is provided with a plurality of evenly distributed hinged seats 201c, and the hinged seats 201c are hinged with triangular plates 203, in the embodiment, the hinged seats 201c and the triangular plates 203 are both six, that is, the triangular plates 203 are in the shape of equilateral triangle, and when the six triangular plates 203 are coplanar, the first channel 201a is just closed, and at this time, the heat of the heat storage chamber 101 cannot be discharged from the opening 101a and the heat delivery pipe 103.

[0042] It should be explained that one side of the triangular plate 203 is chamfered or rounded, so that the triangular plate 203 is convenient to open.

[0043] The side of the triangular plate 203 is provided with an elastic sheet 204, and the elastic sheet 204 is in the shape of ">". Under the action of the elastic sheet 204, the six triangular plates 203 are coplanar, that is, the first channel 201a is closed.

[0044] Further, the joint 202 is provided with an insertion end 202a, the insertion end 202a is provided with a second channel 202b penetrating through. When the joint 202 is connected with the connecting piece 201, the insertion end 202a is embedded into the first channel 201a, and the six triangular plates 203 are pushed open, so that a passage is formed between the second channel 202b and the first channel 201a.

[0045] The first channel 201a is provided with an annular disc 205, and a first elastic piece 205a is arranged between the end of the first channel 201a away from the triangular plate 203 and the annular disc 205. The first elastic piece 205a is a spring, and when the insertion end 202a is embedded into the first channel 201a to push open the six triangular plates 203, the top end of the triangular plate 203 also pushes the annular disc 205 to move.

[0046] The first channel 201a is provided with a limiting slot 201f on the side, the annular boss 201b is provided with a positioning slot 201d on the side, the limiting slot 201f and the positioning slot 201d are provided with a communication slot 201e between them, the annular disc 205 is provided with an L-shaped rod 205b on the side, the L-shaped rod 205b is embedded in the limiting slot 201f and the communication slot 201e, and the L-shaped rod 205b moves along with the annular disc 205.

[0047] The positioning slot 201d is provided with a positioning block 206, the positioning block 206 and the positioning slot 201d are provided with a second elastic element 206a between them, the second elastic element 206a is a spring, that is, under the action of the second elastic element 206a, the positioning block 206 has a tendency to move to the center of the first channel 201a; the end of the L-shaped rod 205b is provided with a chamfer, and the side of the positioning block 206 is provided with a recess hole 206b; when the insertion end 202a is not inserted into the first channel 201a, the annular disc 205 is located close to the triangular plate 203, and at this time, the end of the L-shaped rod 205b is embedded in the recess hole 206b to fix the positioning block 206; when the insertion end 202a is embedded into the first channel 201a to push open the six triangular plates 203, the top end of the triangular plate 203 also pushes the annular disc 205 to move, the end of the L-shaped rod 205b is separated from the recess hole 206b, so that the positioning block 206 is not limited by the L-shaped rod 205b and is ejected under the action of the second elastic element 206a, wherein the outer periphery of the insertion end 202a is provided with a limiting ring groove 202c, and at this time, the positioning block 206 is embedded into the limiting ring groove 202c to be fixed; and it should be explained that when the insertion end 202a is completely inserted into the first channel 201a, the end of the L-shaped rod 205b is completely separated from the recess hole 206b.

[0048] Preferably, the connecting piece 201 is provided with a separation hole penetrating into the positioning slot 201d, and one end of the positioning block 206 is provided with a separation rod 206c penetrating through the separation hole, so that when the joint 202 needs to be separated from the connecting piece 201, the separation rod 206c is operated to make the positioning block 206 separate from the limiting ring groove 202c, at this time, the joint 202 is no longer limited and can be ejected under the action of the spring.

[0049] Embodiment 2

[0050] Reference Figures 1-7 This is the second embodiment of the application, which is based on the previous embodiment, and is different from the previous embodiment in that:

[0051] The heat delivery pipe 103 and the connecting piece 201 are connected through the adapter unit 300, and the adapter unit 300 includes a safety pipe 301, and the two ends of the safety pipe 301 are connected with the heat delivery pipe 103 and the connecting piece 201 respectively.

[0052] When providing heat demand, since the heat directly released from the heat storage unit 100 cannot be controlled, it may cause the high-temperature hot air temperature to be too high or the heat flow to be too much during heat release, exceeding the actual demand, and therefore the adapter unit 300 needs to be provided between the heat delivery pipe 103 and the connecting piece 201 to keep the high-temperature hot air delivery within a safe range.

[0053] The adapter unit 300 includes a safety pipe 301. The safety pipe 301 is connected at both ends to the heat delivery pipe 103 and the connecting piece 201.

[0054] The safety pipe 301 is provided with a first annular groove 301a inside, the first annular groove 301a has a larger inner diameter than the safety pipe 301, a rotating piece 302 is provided inside the first annular groove 301a, the rotating piece 302 is provided with a through channel, the rotating piece 302 can rotate in the first annular groove 301a, a first opening 301b is provided on the side of the first annular groove 301a to the outside of the safety pipe 301, a second opening 302c is provided on the side of the rotating piece 302, it should be noted that the initial position of the rotating piece 302 is set to 0°, at this time the first opening 301b and the second opening 302c are completely offset, when the rotating piece 302 rotates 90°, the first opening 301b and the second opening 302c coincide, so that the first opening 301b and the second opening 302c form an opening to discharge the internal overheated steam or saturated steam, and in the process of the position of the rotating piece 302 from 0° to 90°, the first opening 301b and the second opening 302c change from offset to partial coincidence, and then to complete coincidence. When the first opening 301b and the second opening 302c are completely offset, the safety pipe 301 transmits the overheated steam or saturated steam as a pipeline, when the first opening 301b and the second opening 302c have a coincident part, part of the overheated steam or saturated steam is discharged from the coincident part of the first opening 301b and the second opening 302c.

[0055] The safety pipe 301 is also provided with a second annular groove 301e inside, the second annular groove 301e has a larger inner diameter than the safety pipe 301, a moving piece 303 is provided inside the safety pipe 301, the moving piece 303 is provided with a through hole inside.

[0056] The moving piece 303 includes a first section A inside the rotating piece 302, and a second section B connected to the first section A. The second section B has a smaller outer diameter than the first section A, one end of the second section B is located inside the second annular groove 301e and is provided with a limiting disc 303a. The second section B is provided with a third opening 303d on the side, and the limiting disc 303a is provided with a fourth opening 303e, that is, the transmission path of the overheated steam or saturated steam in the safety pipe 301 is the rotating piece 302, the first section A, the second section B, the third opening 303d, the fourth opening 303e, or the rotating piece 302, the second opening 302c, the first opening 301b.

[0057] The inner side of the rotating member 302 away from one end of the second annular groove 301e is provided with an axially extending guide groove 302a, one end of the guide groove 302a is connected with a spiral groove 302b, the outer side of the moving member 303 is provided with a first boss 303b, the first boss 303b is embedded in the guide groove 302a or the spiral groove 302b, that is, when the first boss 303b moves in the guide groove 302a, the rotating member 302 and the moving member 303 do not relatively rotate, when the first boss 303b moves in the spiral groove 302b, the rotating member 302 and the moving member 303 relatively spiral.

[0058] The side of the second annular groove 301e is provided with an axially extending limiting groove 301c, the side of the limiting disc 303a is provided with a second boss 303c, the second boss 303c is embedded in the limiting groove 301c, therefore the moving member 303 cannot rotate, so when the first boss 303b moves in the spiral groove 302b, the rotating member 302 is driven to deflect.

[0059] Further, the second annular groove 301e is provided with an adjusting ring 304, the adjusting ring 304 and the limiting disc 303a are provided with an elastic member 305. The elastic member 305 is a spring, under the action of the spring, the first boss 303b of the moving member 303 is in the guide groove 302a.

[0060] In the embodiment, the maximum flow rate\pressure of the superheated steam or saturated steam that the device needing heat can accept is set as a, when the flow rate\pressure of the superheated steam or saturated steam entering the safety pipe 301 is within a, the pressure of the elastic member 305 makes the length of the elastic member 305 not much shorter than the length of the guide groove 302a, the pressure of the superheated steam or saturated steam on the limiting disc 303a can push the first boss 303b to move in the guide groove 302a, at this time the rotating member 302 does not deflect, all the superheated steam or saturated steam can pass through the safety pipe 301; when the flow rate\pressure of the superheated steam or saturated steam entering the safety pipe 301 is greater than a, the pressure generated thereby is enough to push the moving member 303 to make the first boss 303b in the spiral groove 302b, and then drive the rotating member 302 to deflect, so that the first opening 301b and the second opening 302c have a coinciding part to discharge the excess superheated steam or saturated steam, when the internal pressure of the safety pipe 301 reaches a safety value, the rotating member 302 automatically resets.

[0061] Preferably, the a value is not fixed for different needs, therefore the a value needs to be adjusted, the specific mode is as follows:

[0062] The third boss 304a is embedded in the groove formed by the internal thread 306a, and the third annular groove 301d is provided with an external thread matched with the internal thread 306a, so that the position of the adjusting ring 304 is changed by the rotating ring 306, and the elastic force of the elastic member 305 is adjusted. When it is needed to adjust the value of a to be larger, the adjusting ring 304 is adjusted to be close to the rotating member 302 so that the compression amount of the elastic member 305 is larger, at this time, the elastic force and the elastic potential energy of the elastic member 305 are larger, that is, a larger value is needed to make the elastic member 305 continue to compress. Similarly, when it is needed to adjust the value of a to be smaller, the adjusting ring 304 is adjusted to be away from the rotating member 302 so that the compression amount of the elastic member 305 is smaller, at this time, the elastic force and the elastic potential energy of the elastic member 305 are relatively smaller, and a smaller value can also compress the elastic member 305.

[0063] In the embodiment, when the heat stack needs to exchange heat and provide heat to the device needing heat, the heat is transported through the heat exchange assembly and the adapter unit, the compression amount of the elastic member 305 is adjusted according to the actual demand, and the heat supply is in a safe range.

[0064] It should be understood that, in the development of any actual implementation, numerous implementation-specific decisions can be made. Such development efforts, while possibly complex and time-consuming, would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure, without undue experimentation.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A high-temperature electrothermal storage heat storage stack structure on the power supply side, characterized in that: include, The heat storage unit (100) includes a heat storage chamber (101), a heat storage brick (102) is provided inside the heat storage chamber (101), and an opening (101a) is provided in the heat storage chamber (101), and a heat delivery pipe (103) is connected to the opening (101a). The connection unit (200) includes a connector (201) connected to the heat supply pipe (103) and a joint (202) connected to the connector (201). The connector (201) is provided with a through first channel (201a). One end of the first channel (201a) connected to the connector (202) is provided with an annular boss (201b). The side of the annular boss (201b) is provided with a plurality of evenly distributed hinge seats (201c). The hinge seat (201c) is hinged with a triangular plate (203). An elastic sheet (204) is provided between the triangular plate (203) and the side of the first channel (201a). The connector (202) is provided with an insertion end (202a), and the insertion end (202a) is provided with a through second channel (202b). An annular disk (205) is provided in the first channel (201a), and a first elastic element (205a) is provided between the end of the first channel (201a) away from the triangular plate (203) and the annular disk (205). The first channel (201a) is provided with a limiting groove (201f) on its side, the annular boss (201b) is provided with a positioning groove (201d) on its side, a connecting groove (201e) is provided between the limiting groove (201f) and the positioning groove (201d), and an L-shaped rod (205b) is provided on the side of the annular disk (205), the L-shaped rod (205b) being embedded in the limiting groove (201f) and the connecting groove (201e); A positioning block (206) is provided in the positioning groove (201d), and a second elastic element (206a) is provided between the positioning block (206) and the positioning groove (201d). The L-shaped rod (205b) has a chamfer at its end, and the positioning block (206) has a recess (206b) on its side. The insertion end (202a) is provided with a limiting annular groove (202c) on its outer periphery; The connector (201) has a separation hole that extends through the positioning groove (201d) on its exterior, and the positioning block (206) has a separation rod (206c) that passes through the separation hole at one end.

2. The high-temperature electrothermal storage reactor structure on the power supply side according to claim 1, characterized in that: The heat delivery pipe (103) and the connector (201) are connected by a transfer unit (300). The transfer unit (300) includes a safety pipe (301), with both ends of the safety pipe (301) connected to the heat delivery pipe (103) and the connector (201) respectively. A first annular groove (301a) is provided inside the safety pipe (301), and a rotating component (302) is provided inside the first annular groove (301a). The rotating component (302) is provided with a through channel. The first annular groove (301a) has a first opening (301b) extending through to the outside of the safety tube (301) on its side, and the rotating part (302) has a second opening (302c) extending through on its side; the safety tube (301) also has a second annular groove (301e) inside, and a moving part (303) is provided inside the safety tube (301), with a through hole inside the moving part (303).

3. The high-temperature electrothermal storage reactor structure on the power supply side according to claim 2, characterized in that: The movable component (303) includes a first segment (A) located within the rotating component (302) and a second segment (B) connected to the first segment (A); One end of the second section (B) is located in the second annular groove (301e) and is provided with a limiting plate (303a). The second segment (B) has a third opening (303d) on its side, and the limiting plate (303a) has a fourth opening (303e).

4. The high-temperature electrothermal storage reactor structure on the power supply side according to claim 3, characterized in that: The rotating part (302) has an axially extending guide groove (302a) on the inner side of the end away from the second annular groove (301e). One end of the guide groove (302a) is connected to a spiral groove (302b). The moving part (303) has a first boss (303b) on the outer side. The first boss (303b) is embedded in the guide groove (302a) or the spiral groove (302b).

5. The high-temperature electrothermal storage reactor structure on the power supply side according to claim 4, characterized in that: The second annular groove (301e) is provided with a limiting groove (301c) extending axially on its side, and the limiting plate (303a) is provided with a second boss (303c) on its side, and the second boss (303c) is embedded in the limiting groove (301c).

6. The high-temperature electrothermal storage reactor structure on the power supply side according to claim 5, characterized in that: An adjusting ring (304) is provided in the second annular groove (301e), and an elastic element (305) is provided between the adjusting ring (304) and the limiting plate (303a); a third boss (304a) is provided on the outer periphery of the adjusting ring (304), and the third boss (304a) passes through the limiting groove (301c); a third annular groove (301d) is provided on the outer periphery of the safety tube (301), and a rotating ring (306) is provided in the third annular groove (301d), and an internal thread (306a) is provided in the rotating ring (306), and the third boss (304a) is embedded in the groove formed by the internal thread (306a).

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