Ammonia water heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, and particularly discloses an ammonia water heat exchanger which comprises a heat exchange shell, an ammonia water heat exchange pipe, a condensate water heat exchange pipe and a tar treatment device. The ammonia water heat exchange pipe is arranged in the heat exchange shell and is used for receiving ammonia water; the condensate water heat exchange pipe is arranged in the heat exchange shell and tightly attached to the ammonia water heat exchange pipe, and the condensate water heat exchange pipe is used for cooling ammonia water in the ammonia water heat exchange pipe. The tar treatment device is connected with the water outlet end of the ammonia water heat exchange pipe, a slidable heat exchange baffle is connected into the tar treatment device and used for slidably blocking the ammonia water heat exchange pipe and the tar treatment device, and a water outlet of the condensate water heat exchange pipe is arranged close to the tar treatment device. The effect of reducing the cleaning cost of the tar in the ammonia water heat exchanger is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to an ammonia water heat exchanger. BACKGROUND

[0002] Ammonia water is an aqueous solution of ammonia, and ammonia gas will volatilize during the use of ammonia water, and the volatilization rate of ammonia gas increases with the increase of the temperature of ammonia water. Therefore, a heat exchanger needs to be used to keep the use environment of ammonia water at a low temperature and reduce the volatilization rate of ammonia gas in ammonia water. In the coking production process, the remaining ammonia water will have tar, and the tar has cohesiveness, and the cohesiveness of the tar increases with the decrease of the temperature. Therefore, after the ammonia water is heat exchanged by the ammonia water heat exchanger, the tar is easy to block the heat exchange pipeline of the ammonia water heat exchanger.

[0003] In the prior art, the treatment method of the tar in the ammonia water heat exchanger is to stop the work of the heat exchanger, disconnect the heat exchange pipeline, install a steam blowing port and a tar discharge port at the inlet and outlet of the ammonia water heat exchanger respectively, blow steam into the heat exchange pipeline to soften the tar, and discharge the softened tar through the tar discharge port to complete the cleaning of the tar.

[0004] The method of cleaning the tar by blowing steam into the heat exchange pipeline needs to stop the work of the heat exchanger and disassemble the heat exchange pipeline, and the cleaning cost is high. CONTENT OF THE INVENTION

[0005] In order to reduce the cleaning cost of the tar in the ammonia water heat exchanger, the present application provides an ammonia water heat exchanger.

[0006] The ammonia water heat exchanger provided by the present application adopts the following technical scheme:

[0007] An ammonia water heat exchanger comprises:

[0008] A heat exchange shell;

[0009] An ammonia water heat exchange pipeline is arranged inside the heat exchange shell and is used for connecting ammonia water;

[0010] A condensed water heat exchange pipeline is arranged inside the heat exchange shell and is closely arranged on the ammonia water heat exchange pipeline, and the condensed water heat exchange pipeline is used for cooling the ammonia water in the ammonia water heat exchange pipeline;

[0011] A tar treatment device is connected to the water outlet end of the ammonia water heat exchange pipeline, and a slidable heat exchange barrier plate is connected inside the tar treatment device, the heat exchange barrier plate is used for slidingly blocking the ammonia water heat exchange pipeline and the tar treatment device, and the water outlet of the condensed water heat exchange pipeline is arranged close to the tar treatment device.

[0012] The heat exchange shell provides a heat exchange space, the ammonia water heat exchange pipe and the condensed water heat exchange pipe are closely arranged, the ammonia water in the ammonia water heat exchange pipe is cooled and the condensed water in the condensed water heat exchange pipe is heated after passing through the heat exchange shell, heat exchange is realized and the effect of cooling the ammonia water, the tar treatment device is connected with the water outlet of the ammonia water heat exchange pipe in a normal state, so that part of the ammonia water in the ammonia water heat exchange pipe flows through the tar treatment device after heat exchange, and most of the tar in the ammonia water heat exchanger is precipitated in the tar treatment device, when the tar in the tar treatment device is too much and needs to be cleaned, the tar treatment device is blocked from the ammonia water heat exchange pipe by the heat exchange blocking plate, then the tar in the tar treatment device is cleaned, the condensed water heat exchange pipe is arranged close to the tar treatment device, which facilitates the treatment of the tar in the tar treatment device, the tar treatment device is isolated from the ammonia water heat exchange pipe by the heat exchange blocking plate, which can reduce the influence of the treatment of the tar in the tar treatment device on the ammonia water in the ammonia water heat exchange pipe, the tar in the ammonia water heat exchange pipe is concentrated in the tar treatment device for treatment, the treatment process does not need to stop the work of the heat exchanger, and finally the cleaning cost of the tar in the ammonia water heat exchanger is reduced.

[0013] Optionally, the tar treatment device comprises a tar storage shell, a tar storage cavity is formed in the tar storage shell, a tar storage opening is formed in one side of the tar storage shell and communicates with the ammonia water heat exchange pipe and the tar storage cavity, and a sliding groove is formed in a cavity wall of the tar storage cavity.

[0014] By adopting the above technical scheme, the tar treatment device realizes the collection and storage of the tar in the ammonia water heat exchange pipe through the tar storage cavity in the tar storage shell, when the tar in the tar storage cavity is too much, the heat exchange blocking plate slides in the sliding groove, so as to block the tar storage cavity and the ammonia water heat exchange pipe, and the tar in the tar storage cavity is cleaned conveniently.

[0015] Optionally, the tar storage shell is connected with a heat exchange flushing mechanism and a waste water discharge mechanism, and the other end of the heat exchange flushing mechanism is connected with the water outlet end of the condensed water heat exchange pipe.

[0016] By adopting the above technical scheme, the heat exchange flushing mechanism and the waste water discharge mechanism connected with the tar storage shell start to work after the heat exchange blocking plate blocks the tar storage cavity and the ammonia water heat exchange pipe, the heat exchange flushing mechanism flushes the tar in the tar storage cavity by using the condensed water at the water outlet end of the condensed water heat exchange pipe, so that the temperature of the tar is increased and the tar adhered to the cavity wall of the tar storage cavity is flushed, and the waste water discharge mechanism discharges the tar flushed out of the tar storage cavity.

[0017] Optionally, the heat exchange flushing mechanism comprises a connecting pipeline and a connecting control valve, one end of the connecting pipeline is connected to the water outlet end of the condensate water heat exchange pipeline, the other end of the connecting pipeline is connected to the water inlet end of the connecting control valve, and the water outlet end of the connecting control valve is connected to the tar storage shell.

[0018] By adopting the above technical scheme, the heat exchange flushing mechanism connects the condensate water in the condensate water heat exchange pipeline after being heated by the connecting pipeline, and then controls the connection between the connecting pipeline and the tar storage cavity through the connecting control valve. After the tar storage cavity is blocked by the heat exchange barrier plate, the connecting control valve controls the connection between the connecting pipeline and the tar storage cavity, so as to realize the flushing effect of the tar in the tar storage cavity.

[0019] Optionally, a temperature detector and a heater are arranged in the connecting pipeline, the temperature detector is used to detect the temperature of the water in the connecting pipeline, and the heater is electrically connected to the temperature detector.

[0020] By adopting the above technical scheme, the temperature detector detects the temperature of the water in the connecting pipeline, and the heater heats the water in the connecting pipeline to a temperature suitable for flushing tar, thereby facilitating the cleaning of the tar in the tar storage cavity.

[0021] Optionally, the wastewater discharge mechanism comprises a wastewater discharge valve and a wastewater discharge pipeline, the water inlet end of the wastewater discharge valve is connected to the bottom end of the tar storage shell, and the water outlet end of the wastewater discharge valve is connected to the wastewater discharge pipeline.

[0022] By adopting the above technical scheme, when the tar in the tar storage cavity is cleaned, the wastewater discharge valve is opened to discharge the tar separated from the inner wall of the tar storage cavity after being flushed by the heat exchange flushing mechanism, thereby realizing the cleaning of the tar in the tar storage cavity.

[0023] Optionally, a stirring and oil removing mechanism is connected in the tar storage shell, and the stirring and oil removing mechanism is used to drive the liquid in the tar storage cavity to flush the inner wall of the tar storage cavity.

[0024] By adopting the above technical scheme, when the tar in the tar storage cavity is treated, the stirring and oil removing mechanism stirs the liquid in the tar storage cavity, so that the tar in the tar storage cavity can be better separated from the inner wall of the tar storage cavity, and the cleaning of the tar storage cavity is completed.

[0025] Optionally, the stirring and oil removing mechanism comprises a stirring motor and a stirring paddle, the stirring motor is connected to the cavity wall of the tar storage cavity, the stirring paddle is arranged in the tar storage cavity, and the stirring paddle is connected to the output shaft of the stirring motor.

[0026] By adopting the technical scheme, the stirring motor drives the stirring paddle to rotate, thereby disturbing the flow direction of the liquid in the tar storage cavity, generating turbulence in the tar storage cavity, and facilitating the cleaning of the tar adhered to the inner wall of the tar storage cavity.

[0027] Optionally, a tar blocking plate is arranged at the connection between the ammonia water heat exchange pipe and the tar treatment device, the tar blocking plate is arranged obliquely towards the heat exchange shell, the tar blocking plate is connected with the inner wall of the ammonia water heat exchange pipe, and the connection between the tar blocking plate and the ammonia water heat exchange pipe is located on the side of the ammonia water heat exchange pipe away from the heat exchange shell.

[0028] By adopting the technical scheme, the tar blocking plate can block the ammonia water close to the tar treatment device, so that the ammonia water in the blocked part flows through the tar treatment device, and the tar in the ammonia water heat exchange pipe is conveniently concentrated in the tar treatment device for precipitation.

[0029] Optionally, a telescopic rod is arranged in the sliding groove, one end of the telescopic rod is connected with the inner wall of the sliding groove, and the other end of the telescopic rod is connected with the heat exchange blocking plate.

[0030] By adopting the technical scheme, the telescopic rod controls the sliding of the heat exchange blocking plate, and when the tar in the tar treatment device is being treated, the telescopic rod drives the heat exchange blocking plate to block the tar treatment device and the ammonia water heat exchange pipe, and when the tar treatment in the tar treatment device is completed, the telescopic rod controls the heat exchange blocking plate to move, so that the tar treatment device is communicated with the ammonia water heat exchange pipe.

[0031] Compared with the prior art, the present application has at least one of the following beneficial technical effects:

[0032] 1. When the ammonia water heat exchanger is working, the ammonia water heat exchange pipe and the condensed water heat exchange pipe exchange heat in the heat exchange shell, so that the temperature of the ammonia water in the ammonia water heat exchange pipe decreases, the temperature of the condensed water in the condensed water heat exchange pipe increases, the tar treatment device is connected with the water outlet end of the ammonia water heat exchange pipe, so as to collect and precipitate the tar in the ammonia water heat exchange pipe, when the tar in the tar treatment device needs to be cleaned, the ammonia water heat exchange pipe and the tar treatment device are isolated by the heat exchange blocking plate, then the tar in the tar treatment device is treated, the work of the heat exchanger does not need to be stopped during the treatment process, and finally the cleaning cost of the tar in the ammonia water heat exchanger is reduced;

[0033] 2. The temperature detector and the heater are arranged in the communication pipeline, the water temperature in the communication pipeline is detected, and the water in the communication pipeline is heated when the water temperature in the communication pipeline does not reach the required water temperature, so as to enhance the flushing effect of the water in the communication pipeline on the tar in the tar storage cavity, and facilitate the treatment of the tar in the tar treatment cavity;

[0034] 3. The tar blocking plate arranged in the ammonia water heat exchange pipe blocks part of the ammonia water in the ammonia water heat exchange pipe, so that more ammonia water flows through the inside of the tar treatment device, and thus more tar in the ammonia water heat exchange pipe is concentrated in the tar treatment device, reducing the probability of the ammonia water heat exchange pipe being blocked by tar, and facilitating the concentration of tar in the ammonia water heat exchange pipe into the tar treatment device for treatment. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0036] Figure 2 is a schematic diagram of the internal structure of the tar storage shell of the present application.

[0037] Figure 3 is a schematic diagram of the structure of the heat exchange blocking plate in the embodiment of the present application.

[0038] Figure 4 is a schematic diagram of the structure of the heat exchange flushing mechanism in the embodiment of the present application.

[0039] In the figure: 1, heat exchange shell; 2, ammonia water heat exchange pipe; 3, condensed water heat exchange pipe; 4, tar treatment device; 41, tar storage shell; 411, tar storage cavity; 412, tar storage opening; 413, sliding groove; 42, heat exchange flushing mechanism; 421, communication pipeline; 422, communication control valve; 423, temperature detector; 424, heater; 43, wastewater discharge mechanism; 431, wastewater discharge valve; 432, wastewater discharge pipe; 44, stirring oil removal mechanism; 441, stirring motor; 442, stirring paddle; 5, heat exchange blocking plate; 6, tar blocking plate; 7, telescopic rod. DETAILED DESCRIPTION

[0040] The following will be described in detail in combination with the accompanying Figures 1-4 The present application will be further described in detail.

[0041] The embodiment of the present application discloses an ammonia water heat exchanger. Referring to Figure 1 and Figure 2 An ammonia water heat exchanger comprises a heat exchange shell 1, an ammonia water heat exchange pipe 2, a condensed water heat exchange pipe 3, and a tar treatment device 4.

[0042] The ammonia water heat exchange pipe 2 and the condensed water heat exchange pipe 3 are both arranged inside the heat exchange shell 1, the condensed water heat exchange pipe 3 is arranged close to the ammonia water heat exchange pipe 2, the tar treatment device 4 is connected to the water outlet end of the ammonia water heat exchange pipe 2, the heat exchange blocking plate 5 is slidingly connected inside the tar treatment device 4, the heat exchange blocking plate 5 slides close to the outer wall of the ammonia water heat exchange pipe 2 and is used to block the tar treatment device 4 and the ammonia water heat exchange pipe 2, and the water outlet of the condensed water heat exchange pipe 3 is arranged close to the tar treatment device 4.

[0043] In the working process of the ammonia water heat exchanger, the condensed water in the condensed water heat exchange pipe 3 exchanges heat with the ammonia water in the ammonia water heat exchange pipe 2, the temperature of the condensed water is raised, the temperature of the ammonia water is lowered, the ammonia water with lowered temperature flows out of the heat exchange shell 1 and passes through the tar treatment device 4, the tar treatment device 4 provides a sticking position for the tar in the ammonia water with lowered temperature, so that the tar in the ammonia water heat exchange pipe 2 is precipitated at the tar treatment device 4, when the tar in the tar treatment device 4 needs to be cleaned due to excessive amount, the heat exchange blocking plate 5 isolates the ammonia water heat exchange pipe 2 from the tar treatment device 4, the water outlet of the condensed water heat exchange pipe 3 arranged close to the tar treatment device 4 facilitates the treatment of the tar in the tar treatment device 4, the working of the ammonia water heat exchanger does not need to be stopped during the treatment of the tar, and finally the cleaning cost of the tar in the ammonia water heat exchanger is reduced.

[0044] With reference to Figure 1 , Figure 2 and Figure 3 , the tar treatment device 4 comprises a tar storage shell 41, a heat exchange flushing mechanism 42 and a waste water discharge mechanism 43, the tar storage shell 41 is provided with a tar storage cavity 411, the side of the tar storage shell 41 close to the ammonia water heat exchange pipe 2 is provided with a tar storage opening 412 communicating with the ammonia water heat exchange pipe 2, the cavity wall of the tar storage cavity 411 close to the tar storage opening 412 is provided with a sliding groove 413, the heat exchange blocking plate 5 slides in the sliding groove 413, the sliding groove 413 is provided with an extension rod 7, one end of the extension rod 7 is fixedly connected with the inner wall of the sliding groove 413, and the other end of the extension rod 7 is fixedly connected with the heat exchange blocking plate 5. The heat exchange flushing mechanism 42 communicates with the cavity wall of the tar storage cavity 411, and the waste water discharge mechanism 43 communicates with the cavity bottom of the tar storage cavity 411.

[0045] The tar treatment device 4 collects the tar in the ammonia water heat exchange pipe 2 from the tar storage opening 412 through the tar storage cavity 411 in the tar storage shell 41, then moves the heat exchange blocking plate 5 through the extension rod 7 in the sliding groove 413 to separate the tar storage cavity 411 from the ammonia water heat exchange pipe 2, the heat exchange flushing mechanism 42 flushes the tar in the tar storage cavity 411 and discharges the tar from the waste water discharge mechanism 43, so that the tar collected in the tar storage cavity 411 is cleaned, after the cleaning is completed, the extension rod 7 moves the heat exchange blocking plate 5, so that the tar storage cavity 411 communicates with the ammonia water heat exchange pipe 2 again, and the tar storage cavity 411 collects the tar in the ammonia water heat exchange pipe 2 again.

[0046] With reference to Figure 2The tar blocking plate 6 is fixedly connected at the connection between the ammonia water heat exchange pipe 2 and the tar treatment device 4. The tar blocking plate 6 is fixedly connected to the ammonia water heat exchange pipe 2 on the side of the tar storage opening 412 away from the heat exchange shell 1. The side of the tar blocking plate 6 away from the pipe wall of the ammonia water heat exchange pipe 2 is obliquely arranged towards the heat exchange shell 1. The end of the tar blocking plate 6 away from the pipe wall of the ammonia water heat exchange pipe 2 is located directly above the tar storage opening 412.

[0047] The tar blocking plate 6 can increase the flow of ammonia water in the ammonia water heat exchange pipe 2 through the tar storage cavity 411, so that more tar is precipitated and accumulated in the tar storage cavity 411, thereby reducing the probability of the ammonia water heat exchange pipe 2 being blocked by tar.

[0048] Referring to Figure 1 and Figure 4 , the heat exchange flushing mechanism 42 includes a communication pipeline 421 and a communication control valve 422. The communication pipeline 421 communicates the water outlet end of the condensed water heat exchange pipe 3 with the water inlet end of the communication control valve 422. The water outlet end of the communication control valve 422 communicates with the side wall of the tar storage cavity 411. The communication pipeline 421 is internally arranged with a temperature detector 423 and a heater 424. The temperature detector 423 is preferably a thermometer. The heater 424 is preferably an electric heating wire electrically connected to the thermometer.

[0049] When the heat exchange flushing mechanism 42 is working, the outlet end of the condensed water heat exchange pipe 3 is connected to the communication pipeline 421 to introduce the condensed water after temperature rising. Then, the temperature detector 423 detects the temperature of the condensed water at this time, and the heater 424 heats the temperature of the condensed water to the required temperature. Then, the communication control valve 422 is used to introduce the tar storage cavity 411 when the tar in the tar storage cavity 411 is treated, so as to clean the tar.

[0050] Referring to Figure 1 , the waste water discharge mechanism 43 includes a waste water discharge valve 431 and a waste water discharge pipe 432. The water inlet end of the waste water discharge valve 431 communicates with the cavity bottom of the tar storage cavity 411. The water outlet end of the waste water discharge valve 431 communicates with the waste water discharge pipe 432.

[0051] The waste water discharge mechanism 43 controls the communication between the waste water discharge pipe 432 and the tar storage cavity 411 through the waste water discharge valve 431. When the tar storage cavity 411 stores tar, the waste water discharge valve 431 isolates the waste water discharge pipe 432. When the tar storage cavity 411 needs to be cleaned, the waste water discharge valve 431 controls the communication between the waste water discharge pipe 432 and the tar storage cavity 411.

[0052] Referring to Figure 2The tar storage cavity 411 is provided with a stirring oil removal mechanism 44, which comprises a stirring motor 441 and a stirring paddle 442.

[0053] When the tar in the tar storage cavity 411 is cleaned, the stirring motor 441 drives the stirring paddle 442 to stir, so that a turbulent flow is generated in the tar storage cavity 411, facilitating the tar in the tar storage cavity 411 to fully contact with the water flow, so as to be washed by the water flow and separated from the inner wall of the tar storage cavity 411, thereby enhancing the cleaning effect of the tar adhered to the inner wall of the tar storage cavity 411.

[0054] The implementation principle of the ammonia water heat exchanger according to an embodiment of the present application is as follows: in the heat exchange process of the ammonia water heat exchanger, the condensate water heat exchange pipe 3 and the ammonia water heat exchange pipe 2 are communicated in the heat exchange shell 1 to realize heat exchange, the ammonia water heat exchange pipe 2 after completing heat exchange is communicated with the tar treatment device 4, the tar carried in the ammonia water is precipitated in the tar treatment device 4 after the temperature of the ammonia water in the ammonia water heat exchange pipe 2 is lowered, then when the tar in the tar treatment device 4 is too much and needs to be cleaned, the ammonia water heat exchange pipe 2 is isolated from the tar treatment device 4 by sliding the heat exchange blocking plate 5, so that the tar in the tar treatment device 4 is then cleaned, the condensate water heat exchange pipe 3 close to the tar treatment device 4 is convenient for processing the tar in the tar treatment device 4, the work of the heat exchanger does not need to be stopped in the cleaning process, and finally the cleaning cost of the tar in the ammonia water heat exchanger is reduced.

[0055] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. An ammonia water heat exchanger, characterized by, The application relates to a heat exchange shell (1), an ammonia water heat exchange pipe (2) arranged in the heat exchange shell (1) and used for connecting ammonia water, a condensed water heat exchange pipe (3) arranged in the heat exchange shell (1) and close to the ammonia water heat exchange pipe (2) and used for cooling ammonia water in the ammonia water heat exchange pipe (2), and a tar treatment device (4) connected with a water outlet end of the ammonia water heat exchange pipe (2). The tar treatment device (4) comprises a tar storage shell (41), a tar storage cavity (411) is formed in the tar storage shell (41), a tar storage opening (412) is formed in one side of the tar storage shell (41) and communicates with the ammonia water heat exchange pipe (2) and the tar storage cavity (411), and a sliding groove (413) is formed in a cavity wall of the tar storage cavity (411). The tar storage shell (41) is connected with a heat exchange flushing mechanism (42) and a waste water discharge mechanism (43), and the other end of the heat exchange flushing mechanism (42) is connected with a water outlet end of the condensed water heat exchange pipe (3). The heat exchange flushing mechanism (42) comprises a communication pipeline (421) and a communication control valve (422), one end of the communication pipeline (421) is connected with the water outlet end of the condensed water heat exchange pipe (3), the other end of the communication pipeline (421) is connected with a water inlet end of the communication control valve (422), and a water outlet end of the communication control valve (422) is connected with the tar storage shell (41). A temperature detector (423) and a heater (424) are arranged in the communication pipeline (421), the temperature detector (423) is used for detecting the temperature of water in the communication pipeline (421), and the heater (424) is electrically connected with the temperature detector (423).

2. An ammonia heat exchanger according to claim 1, characterized in that: The waste water discharge mechanism (43) comprises a waste water discharge valve (431) and a waste water discharge pipeline (432), a bottom end of the tar storage shell (41) is connected with a water inlet end of the waste water discharge valve (431), and a water outlet end of the waste water discharge valve (431) is connected with the waste water discharge pipeline (432).

3. An ammonia heat exchanger according to claim 2, characterized in that: The tar storage shell (41) is connected with a stirring oil removal mechanism (44), the stirring oil removal mechanism (44) is used for driving liquid in the tar storage cavity (411) to move and flush the inner wall of the tar storage cavity (411).

4. An ammonia heat exchanger according to claim 3, characterized in that: The stirring oil removal mechanism (44) comprises a stirring motor (441) and a stirring paddle (442), the stirring motor (441) is connected with a cavity wall of the tar storage cavity (411), the stirring paddle (442) is arranged in the tar storage cavity (411), and the stirring paddle (442) is connected with an output shaft of the stirring motor (441).

5. An ammonia heat exchanger according to claim 4, characterized in that: ​ 6. An ammonia heat exchanger according to claim 4, characterized in that: ​ 7. An ammonia heat exchanger according to claim 3, wherein: ​ 8. An ammonia heat exchanger according to claim 7, characterized in that: ​ 9. An ammonia heat exchanger as claimed in claim 1, wherein: The tar blocking plate (6) is arranged at the connection between the ammonia water heat exchange pipe (2) and the tar treatment device (4), is arranged obliquely towards the heat exchange shell (1), is connected with the inner wall of the ammonia water heat exchange pipe (2), and is located at the side, away from the heat exchange shell (1), of the connection between the ammonia water heat exchange pipe (2) and the tar treatment device (4).

10. An ammonia heat exchanger as claimed in claim 2, wherein: The telescopic rod (7) is arranged in the sliding groove (413), one end of the telescopic rod (7) is connected with the inner wall of the sliding groove (413), and the other end of the telescopic rod (7) is connected with the heat exchange blocking plate (5).

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