Impact-resistant device of heat exchanger

Abstract

The utility model relates to the field of heat exchangers of a gas phase fluidized bed polyethylene process, in particular to an impact-resistant device for a heat exchanger, which comprises a mounting part, a flow dividing part and a flow dividing part, the flow dividing device is arranged in the flow dividing channel and configured to bear steam impact of the air inlet of the heat exchanger and disperse steam to the periphery; the spiral air channel is arranged at the end, away from the air inlet of the heat exchanger, of the flow dividing device and is configured to receive steam output by the flow dividing device and enable the steam to spiral. The heat exchange efficiency is improved while the service life of the heat exchange tube is prolonged.

Description

Technical Field

[0001] The present application generally relates to the technical field of heat exchangers for gas-phase fluidized bed polyethylene processes, and in particular to a heat exchanger impact-resistant device. Background Art

[0002] In the heating and temperature-regulating water system of the polyolefin linear low-density polyethylene polymerization reactor, the reactor temperature must be kept constant at 85°C before the reactor is put into operation. The temperature-regulating water system needs to be heated by steam, and the temperature-regulating water system then exchanges heat with the reactor through the reactor heat exchanger, thereby ensuring that the reactor temperature is maintained at a constant temperature of 85°C.

[0003] In the operation of traditional heat exchangers, when high-temperature and high-pressure steam passes through the heat exchange tubes of the heat exchanger, the heat exchange tubes are impacted by the steam for a long time, which will cause damage to the heat exchange tubes, shorten the service life of the heat exchanger, and cause many inconveniences in repairing the heat exchange tubes. Utility Model Content

[0004] In order to meet the problem that the heat exchanger in the conventional gas-phase fluidized bed polyethylene process is easily damaged by the impact of high-temperature and high-pressure steam, the present application provides a heat exchanger impact-resistant device, which reduces the impact force of steam and allows the steam to fully contact the heat exchange tubes in the heat exchanger.

[0005] According to one aspect of the present application, a heat exchanger impact resistant device is provided, the impact resistant device comprising:

[0006] a mounting portion configured to connect to an air inlet of the heat exchanger and define a diversion channel;

[0007] A diversion device is provided in the diversion channel and is configured to withstand the impact of steam at the heat exchanger inlet and disperse the steam to the surrounding area; and

[0008] The spiral air duct is arranged at one end of the diverter device away from the air inlet of the heat exchanger, and is configured to receive the steam output by the diverter device and make the steam spiral.

[0009] In some embodiments, the mounting portion includes:

[0010] a threaded connector configured to be threadedly connected to an inner wall of an air inlet of a heat exchanger; and

[0011] Flange, one end is connected to the threaded connector and the other end is connected to the gas supply pipe.

[0012] In some embodiments, the threaded connector comprises:

[0013] A threaded pipe, the outer wall of which is threadedly connected to the inner wall of the heat exchanger air inlet; and

[0014] The gradually expanding pipe is arranged in the threaded pipe, with the small diameter end connected to the flange and the large diameter end connected to the inner wall of the threaded pipe away from the flange.

[0015] In some embodiments, the diversion device comprises:

[0016] a tapered member disposed within the diverging tube with its apex proximate to the small diameter end of the diverging tube; and

[0017] The elastic telescopic member has one end connected to the bottom end of the cone and the other end connected to the spiral air channel, and is configured to receive the force generated by steam impacting the cone so that the steam can be dispersed to all sides along the gap between the gradually expanding tube and the cone.

[0018] In some embodiments, the elastic member comprises:

[0019] a telescopic sleeve, arranged between the conical member and the spiral airway;

[0020] A spring is sleeved on the outer wall of the telescopic sleeve, with two ends respectively abutting against the conical member and the spiral air channel; and

[0021] Two protection tubes are sleeved on the outer wall of the spring, the two protection tubes are sleeved, and the two protection tubes are respectively connected to the cone and the spiral airway.

[0022] In some embodiments, the spiral airway comprises:

[0023] A mounting bracket assembly is provided at an end of the threaded pipe away from the flange and is configured to fix the telescopic sleeve and define a spiral air outlet channel;

[0024] a spiral blade assembly disposed on the mounting frame assembly; and

[0025] a baffle assembly disposed between the spiral blade assembly and the inner wall of the heat exchanger air inlet and configured to further divert the steam diverted by the diverter device so that a portion of the steam passes through the baffle assembly and another portion passes through the spiral blade assembly;

[0026] The sealing plate is configured to close the gap between the spiral blade assembly and the baffle assembly.

[0027] In some embodiments, the mounting bracket assembly includes:

[0028] A blade connecting rod, one end of which is connected to the telescopic sleeve and the other end of which is mounted with a spiral blade assembly; and

[0029] The support frame is configured to fix the blade connecting rod to one end of the threaded tube.

[0030] In some embodiments, the spiral blade assembly comprises:

[0031] A plurality of blades arranged obliquely, each of the blades being arranged in a divergent manner with the blade connecting rod as the axis; and

[0032] The guide ring is sleeved on one end of the blade connecting rod close to the telescopic sleeve. The guide ring is a trumpet-shaped structure, with the large-diameter end close to the telescopic sleeve.

[0033] In some embodiments, the baffle assembly includes:

[0034] A first isolation plate is vertically arranged on a side of the blade away from the blade connecting rod; and

[0035] The second isolation plate is arranged between the first isolation plate and the air inlet of the heat exchanger, and one side is hinged to the end of the first isolation plate close to the air inlet of the heat exchanger;

[0036] The spring piece is arranged between the first isolation plate and the second isolation plate.

[0037] The embodiments of the present application have the following advantages: the steam flow rate is slowed by the diverter device, and the diverted steam can be moved along the inner wall of the heat exchanger to heat the edge heat exchange tubes. At the same time, a portion of the steam passes through the spiral air channel and spirals into the heat exchange tubes in the middle area, allowing the steam to stay in the middle area longer and come into more complete contact with the heat exchange tubes, thereby improving the heat exchange efficiency of the heat exchange tubes and reducing the impact of high-speed steam on the heat exchange tubes.

[0038] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0039] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0041] Figure 1 A schematic diagram of the installation of the installation portion according to an embodiment of the present application is shown.

[0042] Figure 2 A schematic structural diagram of a heat exchanger according to an embodiment of the present application is shown.

[0043] Figure 3 Show Figure 1 A magnified schematic diagram of area A in the middle.

[0044] Figure 4 Show Figure 3 Schematic diagram of the enlarged area B.

[0045] Figure 5 Show Figure 3 Schematic diagram of the enlarged area C in the middle.

[0046] Figure 6 A schematic structural diagram of a baffle assembly according to an embodiment of the present application is shown.

[0047] Reference numerals

[0048] 1-Installation part;

[0049] 11-threaded connector; 12-flange;

[0050] 111-threaded pipe; 112-gradually expanded pipe;

[0051] 2- diversion device;

[0052] 21-conical member; 22-elastic telescopic member;

[0053] 221- telescopic sleeve; 222- spring; 223- protective tube;

[0054] 3-Spiral airway;

[0055] 31-mounting frame assembly; 32-spiral blade assembly; 33-baffle assembly; 34-sealing plate;

[0056] 311- blade connecting rod; 312- support frame;

[0057] 321- blade; 322- guide ring;

[0058] 331-first isolation plate; 332-second isolation plate; 333-spring;

[0059] 4-air inlet; 5-air outlet; 6-heat exchange tube; 7-input port; 8-output port. DETAILED DESCRIPTION

[0060] In order to make the purpose, scheme and advantages of the technical solution of this application clearer, the following will be combined with the drawings of the specific embodiments of this application to clearly and completely describe the technical solution of the embodiment of this application. Unless otherwise specified, the terms used in this article have the common meanings in the art. The same reference numerals in the drawings represent the same components.

[0061] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0062] As described above, in the use of traditional gas-phase fluidized bed polyethylene process heat exchangers, high-temperature and high-pressure steam needs to pass through the heat exchange tubes in the heat exchanger to achieve the purpose of heating the medium in the heat exchange tubes. However, due to the high pressure of the input steam, the impact effect on the heat exchange tubes in the heat exchanger is strong, resulting in the problem of heat exchange tube breakage during long-term use.

[0063] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, an exemplary embodiment of the present application provides a heat exchanger impact-resistant device, which includes: a mounting portion, configured to connect to the heat exchanger air inlet and define a diversion channel; a diversion device, arranged in the diversion channel, configured to withstand the impact of steam at the heat exchanger air inlet and disperse the steam to the surroundings; and a spiral airway, arranged at the end of the diversion device away from the heat exchanger air inlet, configured to receive the steam output by the diversion device and make the steam swirl, thereby reducing the impact of high-temperature and high-pressure steam on the heat exchange tube, allowing the steam to fully contact the heat exchange tube, extending the service life of the heat exchange tube while improving the heat exchange efficiency.

[0064] The heat exchanger impact-resistant device according to an embodiment of the present application is exemplarily described below with reference to the accompanying drawings. Figure 1 A schematic diagram of the installation of the installation portion according to an embodiment of the present application is shown. Figure 2 A schematic diagram of a heat exchanger structure according to an embodiment of the present application is shown. In one embodiment, a heat exchanger impact-resistant device includes: a mounting portion 1 configured to connect to a heat exchanger air inlet 4 and define a diversion channel; a diversion device 2 disposed within the diversion channel and configured to withstand the impact of steam from the heat exchanger air inlet 4 and disperse the steam to the surrounding area; and a spiral air channel 3 disposed at the end of the diversion device 2 away from the heat exchanger air inlet 4 and configured to receive steam output by the diversion device 2 and cause the steam to spiral.

[0065] During use, the medium enters from the input port 7 on one side of the heat exchanger, passes through the heat exchange tube 6 and is output from the output port 8 on the other side. During this process, high-temperature and high-pressure steam enters from the air inlet 4 and is discharged from the air outlet 5. The steam entering from the radial direction of the heat exchange tube 6 passes through the heat exchange tube 6, and the medium in the heat exchange tube 6 is heated. At the same time, the steam first passes through the diverter device 2, impacts the diverter device 2, slows down the steam flow rate, and is diverted through the diverter device 2, so that the steam diffuses to the surroundings. Part of the steam will move along the curved inner wall of the heat exchanger, and the other part will pass through the spiral air channel 3 and spiral through the heat exchange tube 6.

[0066] It is worth noting that, in a conventional heat exchanger, since steam enters the heat exchange tube 6 directly through the input port, it can only heat the heat exchange tube 6 in the middle position, resulting in uneven heating of the heat exchange tube 6 at the edge and the lower layer, and low heat exchange efficiency. Moreover, since the temperature of the medium in the heat exchange tube 6 is lower than the steam temperature, the temperature of the outer wall and both ends of the heat exchange tube 6 is high, while the temperature in the middle is low, resulting in pipeline rupture due to thermal expansion and contraction.

[0067] Regarding the mounting portion 1, if the heat exchanger is long and a single mounting portion 1 and a diverter device 2 cannot adequately direct the steam to both ends of the heat exchanger, then multiple air inlets 4 can be opened in the axial direction of the heat exchanger according to actual use needs, thereby achieving better steam heating of the medium in the heat exchange tube 6 by setting multiple diverter devices 2.

[0068] The impact-resistant device involved in the present application can not only divert part of the steam to the curved inner wall of the heat exchanger, so that the heat exchange tube 6 at the edge can also fully contact with the steam, but also, after passing through the spiral air channel 3, it spirals downward, so that the steam in the middle area stays on the surface of the heat exchange tube 6 for a relatively longer time, and can improve the problem of uneven heating at both ends.

[0069] Figure 1 A schematic diagram of the installation of the installation portion according to an embodiment of the present application is shown. Figure 3 Show Figure 1 An enlarged schematic diagram of area A in the center. In some embodiments, mounting portion 1 includes a threaded connector 11 configured to threadably connect to the inner wall of heat exchanger air inlet 4; and a flange 12, one end of which is connected to threaded connector 11 and the other end is connected to the air supply line. Threaded connector 11 includes a threaded tube 111, the outer wall of which is threadedly connected to the inner wall of heat exchanger air inlet 4; and a diverging tube 112, disposed within threaded tube 111, with its smaller diameter end connected to flange 12 and its larger diameter end connected to the inner wall of threaded tube 111, away from flange 12.

[0070] During use, the threaded tube 111 is threadedly connected to the air inlet 4 of the heat exchanger, so that after the diverging tube 112 and the diverter device 2 in the threaded tube 111 fail, the threaded tube 111 can be taken out, and the diverter device 2 and the diverging tube 112 can be taken out together for maintenance. When the steam hits the diverter device 2, the dispersed steam enters the heat exchanger from the surface of the diverging tube 112.

[0071] It is worth noting that one end of the diverging tube 112 is connected to the air intake pipe, and the inner diameter of the air intake pipe is the same as the small diameter end of the diverging tube 112. The inner diameter of the other end of the diverging tube 112 is large, so that the high-pressure steam will further slow down the flow rate when passing through the diverging tube 112.

[0072] When high-pressure air moves from a small-diameter pipe into a large-diameter pipe, the flow rate changes according to the continuity equation in fluid mechanics. Specifically, the flow rate decreases.

[0073] The flow rate can be expressed as:

[0074] Q=A1v1=A2v2

[0075] Among them, A1 and A2 are the cross-sectional areas of the small diameter pipe and the large diameter pipe, respectively, and v1 and v2 represent the flow rates of the fluid in the small diameter pipe and the large diameter pipe, respectively.

[0076] Because the cross-sectional area A2 of the pipe with a larger diameter is larger than the cross-sectional area A1 of the pipe with a smaller diameter, in order to keep the flow rate unchanged, the flow velocity v2 must be smaller than the flow velocity v1.

[0077] Therefore, when steam enters the gradually expanding tube 112 from the gas supply pipe with a small diameter and is output from the gradually expanding tube 112 with a large diameter, the steam flow rate will be further slowed down.

[0078] Figure 1 A schematic diagram of the installation of the installation portion according to an embodiment of the present application is shown. Figure 3 Show Figure 1 A magnified schematic diagram of area A in the middle. Figure 4 Show Figure 3An enlarged schematic diagram of the middle B area. In some embodiments, the diverter device 2 includes: a conical member 21, which is arranged in the diverging tube 112, with its apex close to the small diameter end of the diverging tube 112; and an elastic telescopic member 22, one end of which is connected to the bottom end of the conical member 21 and the other end is connected to the spiral airway 3, and is configured to receive the force generated by the steam impacting the conical member 21, so that the steam diverges to the surrounding areas along the gap between the diverging tube 112 and the conical member 21. The elastic telescopic member 22 includes: a telescopic sleeve 221, which is arranged between the conical member 21 and the spiral airway 3; a spring 222, which is sleeved on the outer wall of the telescopic sleeve 221, with its two ends respectively abutting the conical member 21 and the spiral airway 3; and two protective tubes 223, the two protective tubes 223 being sleeved on the outer wall of the spring 222, the two protective tubes 223 being sleeved, and the two protective tubes 223 are respectively connected to the conical member 21 and the spiral airway 3.

[0079] During use, when steam enters the gradually diverging tube 112, the conical member 21 is pushed by the spring 222 to initially abut against the small diameter end of the gradually diverging tube 112. After the steam impacts the conical member 21, the conical member 21 moves toward the spring 222, compressing the spring 222. The conical member 21 buffers the steam and disperses the steam to the surroundings along the outer wall of the conical member 21, which is beneficial for the steam to heat the outer heat exchange tube 6 through the inner wall of the heat exchanger. When the spring 222 is compressed, the elastic telescopic member 22 retracts, and the elastic telescopic member 22 guides the conical member 21, and the two outer protective tubes 223 are connected and also retract.

[0080] It is worth noting that when steam is not passed into the heat exchanger, the conical member 21 abuts against the small diameter end of the gradually expanding tube 112, sealing one end of the gradually expanding tube 112, so that when the steam pipe is not supplying gas, the steam will not enter the heat exchanger after condensation, causing liquid accumulation in the heat exchanger, thereby corroding the metal parts in the heat exchanger, and improving the sanitary conditions in the heat exchanger, making it easier to clean.

[0081] It is worth noting that the protective plate can seal the space between the spring 222 and the telescopic sleeve 221, so that steam will not enter the elastic telescopic part 22, thereby preventing the elastic telescopic part 22 from being corroded, thereby extending the service life of the elastic telescopic part 22.

[0082] Figure 1 A schematic diagram of the installation of the installation portion according to an embodiment of the present application is shown. Figure 3 Show Figure 1 A magnified schematic diagram of area A in the middle. Figure 4 Show Figure 3 Schematic diagram of the enlarged area B. Figure 5 Show Figure 3 Schematic diagram of the enlarged area C in the middle. Figure 6A schematic diagram of the baffle assembly structure according to an embodiment of the present application is shown. In some embodiments, the spiral air duct 3 includes: a mounting frame assembly 31, disposed at the end of the threaded tube 111 away from the flange 12, configured to fix the telescopic sleeve 221 and define the spiral air outlet channel; a spiral blade assembly 32, disposed on the mounting frame assembly 31; and a baffle assembly 33, disposed between the spiral blade assembly 32 and the inner wall of the heat exchanger air inlet 4, configured to further divert the steam diverted by the diversion device 2, so that part of the steam passes through the baffle assembly 33 and the other part passes through the spiral blade assembly 32; a sealing plate 34, configured to close the gap between the spiral blade assembly 32 and the baffle assembly 33. A blade connecting rod 311, one end of which is connected to the telescopic sleeve 221 and the other end of which is mounted with the spiral blade assembly 32; and a support frame 312, configured to fix the blade connecting rod 311 to one end of the threaded tube 111. The spiral blade assembly 32 comprises: a plurality of inclined blades 321, each of which is arranged in a divergent manner with the blade connecting rod 311 as the axis; a guide ring 322, which is mounted on the end of the blade connecting rod 311 near the telescopic sleeve 221. The guide ring 322 has a trumpet-shaped structure, with the larger diameter end near the telescopic sleeve 221. The baffle assembly 33 comprises: a first isolation plate 331, which is vertically arranged on the side of the blade 321 away from the blade connecting rod 311; a second isolation plate 332, which is arranged between the first isolation plate 331 and the heat exchanger air inlet 4, with one side hinged to the end of the first isolation plate 331 near the heat exchanger air inlet 4; and a spring 333, which is arranged between the first isolation plate 331 and the second isolation plate 332.

[0083] During use, part of the steam moves along the inner wall of the heat exchanger, and part enters the spiral air duct 3. Since the blades 321 of the spiral air duct 3 are fixed, the moving direction is tilted when the steam passes through the inclined blades 321, so that the steam moves in a spiral motion after passing through the blades 321. The spiral steam enters the bottom from the surface of the heat exchange tube 6 above, and can fully contact each layer of the heat exchange tube 6, thereby improving the heat exchange efficiency. When the steam moves toward the side wall of the heat exchanger through the conical part 21, the steam pushes the second isolation plate 332 to swing around the top of the first isolation plate 331. At this time, a gap appears between the second isolation plate 332 and the inner wall of the air inlet 4, and part of the air enters the heat exchanger through the gap.

[0084] It is worth noting that since a spring plate 333 is provided between the second isolation plate 332 and the first isolation plate 331, the steam will lose some kinetic energy when pushing the second isolation plate 332, thereby further slowing down the flow rate, and allowing most of the steam to enter the blade 321, ensuring that the heat exchange tube 6 located in the central area is fully heated.

[0085] While various embodiments of the present application have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0086] The terms used in this document are selected to best explain the principles of the embodiments, practical applications or technical improvements in the market, or to enable other ordinary technicians in this technical field to understand the embodiments disclosed in this document.

[0087] The above are merely optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may be subject to various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A heat exchanger impact resistant device, characterized in that: include: A mounting portion (1) configured to connect to the heat exchanger air inlet (4) and define a diversion channel; A diversion device (2) is provided in the diversion channel and is configured to withstand the steam impact from the heat exchanger air inlet (4) and disperse the steam to the surrounding areas; and The spiral air channel (3) is arranged at one end of the diverter device (2) away from the heat exchanger air inlet (4), and is configured to receive the steam output by the diverter device (2) and make the steam spiral.

2. The heat exchanger impact resistant device according to claim 1, characterized in that: The mounting portion (1) comprises: a threaded connection member (11) configured to be threadedly connected to the inner wall of the heat exchanger air inlet (4); and A flange (12) has one end connected to the threaded connector (11) and the other end connected to the air supply pipeline.

3. The heat exchanger impact resistant device according to claim 2, characterized in that: The threaded connection (11) comprises: A threaded pipe (111) having an outer wall threadedly connected to an inner wall of the heat exchanger air inlet (4); and The gradually expanding tube (112) is arranged in the threaded tube (111), with a small diameter end connected to the flange (12) and a large diameter end connected to the inner wall of the threaded tube (111) away from the flange (12).

4. The heat exchanger impact-resistant device according to claim 3, characterized in that: The diversion device (2) comprises: a tapered member (21) disposed within the diverging tube (112), with its apex close to the small diameter end of the diverging tube (112); and The elastic telescopic member (22) has one end connected to the bottom end of the conical member (21) and the other end connected to the spiral air channel (3), and is configured to receive the force generated by the steam impacting the conical member (21), so that the steam is dispersed to the surroundings along the gap between the gradually expanding tube (112) and the conical member (21).

5. The heat exchanger impact-resistant device according to claim 4, characterized in that: The elastic expansion member (22) comprises: A telescopic sleeve (221) is arranged between the conical member (21) and the spiral air channel (3); A spring (222) is sleeved on the outer wall of the telescopic sleeve (221), with two ends respectively contacting the conical member (21) and the spiral air channel (3); and Two protective tubes (223) are sleeved on the outer wall of the spring (222), the two protective tubes (223) are sleeved, and the two protective tubes (223) are respectively connected to the conical part (21) and the spiral airway (3).

6. The heat exchanger impact-resistant device according to claim 5, characterized in that: The spiral airway (3) includes: A mounting frame assembly (31) is provided at one end of the threaded tube (111) away from the flange (12), and is configured to fix the telescopic sleeve (221) and define a spiral air outlet channel; A spiral blade assembly (32) is disposed on the mounting frame assembly (31); and a baffle assembly (33) disposed between the spiral blade assembly (32) and the inner wall of the heat exchanger air inlet (4), and configured to further divert the steam diverted by the diverting device (2), so that a portion of the steam passes through the baffle assembly (33) and another portion passes through the spiral blade assembly (32); The sealing plate (34) is configured to close the gap between the spiral blade assembly (32) and the baffle assembly (33).

7. The heat exchanger impact resistant device according to claim 6, characterized in that: The mounting frame assembly (31) includes: A blade connecting rod (311), one end of which is connected to the telescopic sleeve (221) and the other end of which is mounted the spiral blade assembly (32); and The support frame (312) is configured to fix the blade connecting rod (311) to one end of the threaded tube (111).

8. The heat exchanger impact-resistant device according to claim 7, characterized in that: The spiral blade assembly (32) includes: A plurality of blades (321) arranged obliquely, each of the blades (321) being arranged in a divergent manner with the blade connecting rod (311) as an axis; and The guide ring (322) is sleeved on one end of the blade connecting rod (311) close to the telescopic sleeve (221). The guide ring (322) is a trumpet-shaped structure, with the large-diameter end close to the telescopic sleeve (221).

9. The heat exchanger impact-resistant device according to claim 8, characterized in that: The baffle assembly (33) includes: A first isolation plate (331) is vertically arranged on a side of the blade (321) away from the blade connecting rod (311); and A second isolation plate (332) is disposed between the first isolation plate (331) and the heat exchanger air inlet (4), with one side being hinged to an end of the first isolation plate (331) close to the heat exchanger air inlet (4); The spring piece (333) is arranged between the first isolation plate (331) and the second isolation plate (332).

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