A rolling metal material waste heat recovery device and method

Abstract

The application discloses a kind of rolling metal material waste heat recovery device and method, its device includes cover body mechanism;Its method includes S1, places after rolling metal material;S2, waste heat recovery;S3, water replenishment;The application can realize scale tunnel type recovery after rolling metal material waste heat by the cooperation of cover body mechanism, air guide mechanism, heat exchange mechanism, steam generator, circulating mechanism and water softener, can control the cooling duration of after rolling metal material according to late process requirement by control system and automation system model cooperation, realize metal material uniform cooling, optimize the performance of metal material.Effectively improve the cooling efficiency of after rolling metal material, and realize waste heat recovery utilization, to help reduce energy consumption, reduce carbon dioxide emission;By supporting mechanism, after rolling metal material can play supporting limiting effect, both can improve the stability of after rolling metal material placed in cover body mechanism, and facilitate to take and place after rolling metal material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot rolling and subsequent production process, in particular to a rolling metal material waste heat recovery device and method. BACKGROUND

[0002] Hot rolling is rolling above the crystallization temperature. Simply speaking, a piece of steel billet is heated and then rolled through several passes, and then trimmed and corrected into a steel plate, which is called hot rolling. It can significantly reduce energy consumption and cost. During hot rolling, the metal has high plasticity and low deformation resistance, greatly reducing the energy consumption of metal deformation. Hot rolling can improve the processing performance of metals and alloys, i.e. breaking the coarse grains in the casting state, significantly healing cracks, reducing or eliminating casting defects, transforming the casting structure into a deformed structure, and improving the processing performance of the alloy.

[0003] For example, the metal material after rolling is still at a high temperature when it is lifted from the cooling bed to the storage and transportation area, usually between 450-500℃. Since this part of the sensible heat is difficult to recover, the steel plant usually uses natural cooling method to reduce the temperature of the rolled metal material to below 200℃ or room temperature. However, this cooling process takes 50-60 hours to complete, and this part of the heat is wasted as waste heat.

[0004] Therefore, a rolling metal material waste heat recovery device and method are provided. SUMMARY

[0005] The technical task of the present application is to solve the above problems, and provide a rolling metal material waste heat recovery device and method.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A rolling metal material waste heat recovery device, comprising a cover body mechanism, an auxiliary air guide mechanism for conveying heat below the inner cavity of the cover body mechanism to the heat exchanger mechanism above is arranged on the cover body mechanism, the inner cavity of the cover body mechanism is sequentially provided from top to bottom with a heat exchange mechanism for heat exchange operation of hot gas-heat conducting medium and a supporting mechanism for supporting the rolling metal material, the cover body mechanism is used for providing a supporting basis for the auxiliary air guide mechanism and the heat exchange mechanism and can form a relatively closed space, one side of the cover body mechanism is provided with a steam generator capable of heating water into hot water or steam by using heat energy, a circulating mechanism for realizing circulating heat conduction is arranged between the steam generator and the heat exchange mechanism, and a water softener for supplying soft water to the steam generator is arranged on one side of the steam generator.

[0008] As preferred, the cover mechanism comprises a cover, the front side or the bottom side of the cover is in an open structure, the upper part of the front side of the cover is fixedly connected with an upper baffle, and the lower part of the front side of the cover is provided with an opening and closing assembly;

[0009] The auxiliary air induction mechanism comprises a wind cover, the wind cover is communicated with the top of the cover, one side of the wind cover is provided with an air induction fan, the air inlet end of the air induction fan is communicated with the wind cover, the air outlet end of the air induction fan is communicated with a wind guide pipe, and the end of the wind guide pipe away from the air induction fan is communicated with the lower part of the inner cavity of the cover.

[0010] The heat exchange mechanism comprises a plate heat exchanger, the plate heat exchanger is fixedly connected with the upper part of the inner cavity of the cover, and the bottom of the plate heat exchanger is communicated with a wind collecting cover.

[0011] The steam generator comprises a steam tank, the steam tank is located at one side of the cover, the top of the steam tank is communicated with a steam outlet pipe, the steam outlet pipe is internally provided with a steam-water separation device, and the steam tank is communicated with the plate heat exchanger through a circulation mechanism.

[0012] The circulation mechanism comprises a circulation pump, the circulation pump is located below the steam tank, the inlet end of the circulation pump is communicated with the outlet end of the steam tank, the outlet end of the circulation pump is communicated with a soft pipe A, the inlet end of the steam tank is communicated with a soft pipe B, the other end of the soft pipe B and the other end of the soft pipe A are respectively communicated with a liquid guide pipe, one end of one of the liquid guide pipes is communicated with the inlet end of the plate heat exchanger, one end of the other liquid guide pipe is communicated with the outlet end of the plate heat exchanger, and the steam tank, the circulation pump, the soft pipe A, one of the liquid guide pipes, the plate heat exchanger, the other liquid guide pipe and the soft pipe B form a medium flow channel.

[0013] The soft water device comprises a soft water tank, the outlet end of the soft water tank is communicated with a soft pipe C, the other end of the soft pipe C is communicated with a water supplement pump, the water supplement pump is located below the steam tank and is communicated with the water supplement inlet end of the steam tank, the inlet end of the soft water tank is communicated with an external water source, and valves are respectively arranged on the inlet and outlet ends of the soft pipe C, the soft pipe A, the soft pipe B and the plate heat exchanger.

[0014] The supporting mechanism comprises a bracket assembly, the bracket assembly is located below the inner cavity of the cover, and each corner of the bottom of the bracket assembly is provided with a moving wheel.

[0015] The bracket assembly comprises a supporting plate, the top of the supporting plate is fixedly connected with a limiting seat on each of the front side and the rear side, the opposite side of each of the two limiting seats is provided with an inclined surface, and the two inclined surfaces are symmetrically arranged about the center of the supporting plate.

[0016] Compared with the prior art, the application has the advantages and positive effects that:

[0017] 1、The application can realize large-scale tunnel-type recovery of the waste heat of the rolled metal material through the cooperation of the cover body mechanism, the auxiliary air guide mechanism, the heat exchange mechanism, the steam generator, the circulation mechanism and the water softener, and through the cooperation of the control system and the automatic system model, the cooling time of the rolled metal material can be controlled according to the later process requirements, the uniform cooling of the metal material is realized, the performance of the metal material is optimized, the cooling efficiency of the rolled metal material is effectively improved, waste heat recovery is realized, thereby helping to reduce energy consumption and reduce carbon dioxide emissions.

[0018] 2、The application can play a supporting and limiting role on the rolled metal material through the setting of the supporting mechanism, can improve the stability of the rolled metal material placed in the cover body mechanism, and facilitates the taking and placing of the rolled metal material, and improves the flexibility of the rolled metal material placed in or moved out of the cover body mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 Structure diagram of the rolled metal material waste heat recovery device of the embodiment of the application Figure 1 ;

[0021] Figure 2 Structure diagram of the rolled metal material waste heat recovery device of the embodiment of the application Figure 2 ;

[0022] Figure 3 Structure diagram of the open state of the opening and closing assembly of the rolled metal material waste heat recovery device of the embodiment of the application

[0023] Figure 4 Structure diagram of the cover, the air guide mechanism and the supporting mechanism of the rolled metal material waste heat recovery device of the embodiment of the application

[0024] Figure 5 Structure diagram of the cover and the air guide mechanism of the rolled metal material waste heat recovery device of the embodiment of the application

[0025] Figure 6 Exploded structure diagram of the cover, the air guide mechanism and the supporting mechanism of the rolled metal material waste heat recovery device of the embodiment of the application

[0026] Figure 7 Structure diagram of the air induction mechanism and the heat exchange mechanism of the rolling metal material waste heat recovery device according to the embodiment of the present application;

[0027] Figure 8 Structure explosion diagram of the heat exchange mechanism of the rolling metal material waste heat recovery device according to the embodiment of the present application;

[0028] Figure 9 Flow chart of the rolling metal material waste heat recovery method according to the embodiment of the present application.

[0029] In the figure: 100, cover mechanism; 110, machine cover; 111, ventilation hole; 120, upper baffle; 130, opening and closing assembly; 131, lower baffle; 132, protruding block; 133, rodless cylinder; 140, filter screen;

[0030] 200, auxiliary air induction mechanism; 210, air cover; 220, air induction fan; 230, air guide pipe;

[0031] 300, heat exchange mechanism; 310, plate heat exchanger; 320, air collecting cover;

[0032] 400, steam generator; 410, steam tank; 420, steam leading-out pipe; 430, liquid level meter;

[0033] 500, circulation mechanism; 510, circulation pump; 520, hose A; 530, hose B; 540, liquid guide pipe;

[0034] 600, water softener; 610, water softening tank; 620, hose C; 630, water replenishing pump;

[0035] 700, supporting mechanism; 710, bracket assembly; 711, supporting plate; 712, limiting seat; 720, moving wheel;

[0036] 800, support. DETAILED DESCRIPTION

[0037] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the present application will be further described below with reference to the drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0038] The present application will be further described below with reference to the drawings and specific embodiments.

[0039] Embodiment 1

[0040] As Figures 1-8As shown, a waste heat recovery device for rolled metal materials according to an embodiment of the present invention includes a cover mechanism 100, on which an auxiliary air-guiding mechanism 200 is provided for transporting heat from the lower part of the inner cavity of the cover mechanism 100 to the upper part. The inner cavity of the cover mechanism 100 is provided from top to bottom with a heat exchange mechanism 300 for heat exchange between hot air and heat transfer medium and a support mechanism 700 for supporting the rolled metal material. The cover mechanism 100 provides a support base for the auxiliary air-guiding mechanism 200 and the heat exchange mechanism 300 and can form a relatively closed space. A steam generator 400 is provided on one side of the cover mechanism 100, which can use thermal energy to heat water into hot water or steam. A circulation mechanism 500 for realizing circulating heat conduction is provided between the steam generator 400 and the heat exchange mechanism 300. A water softener 600 for replenishing soft water to the steam generator 400 is provided on one side of the steam generator 400.

[0041] Example 2

[0042] like Figures 1-8 As shown, the waste heat recovery device for rolled metal materials provided in this embodiment differs from that in Embodiment 1 in that:

[0043] The cover mechanism 100 includes a machine cover 110. The front and bottom surfaces of the machine cover 110 are open. An upper baffle 120 is fixedly connected to the upper part of the front surface of the machine cover 110, and an opening / closing assembly 130 is provided at the lower part of the front surface of the machine cover 110. The cover mechanism 100 provides a relatively enclosed space for the rolled metal material, facilitating subsequent waste heat recovery operations. The opening / closing assembly 130 includes a lower baffle 131 movably connected to the front surface of the machine cover 110. A protrusion 132 is fixedly connected to both sides of the lower baffle 131. A rodless cylinder 133 is vertically fixedly connected to both sides of the front surface of the machine cover 110. The rodless cylinder 133 and the protrusion 132 are arranged in a one-to-one correspondence. The slide of the rodless cylinder 133 is fixed to one side of the protrusion 132. The connection is fixed. By activating the rodless cylinder 133, the slide table can drive the protrusion 132 and the lower baffle 131 to move up or down, thereby realizing the automatic opening and closing of the lower baffle 131, so that the rolling metal material can be picked up and put down by the support mechanism 700. Two ventilation holes 111 are opened on one side of the machine cover 110. Two filters 140 are installed on one side of the machine cover 110, which are arranged vertically to cover the ventilation holes 111. The filters 140 are arranged one-to-one with the ventilation holes 111. The filters 140 can filter the gas entering the machine cover 110, preventing large impurities from being sucked into the inner cavity of the machine cover 110, and at the same time helping to improve the safety of the auxiliary ventilation mechanism 200 during operation.

[0044] The auxiliary air induction mechanism 200 comprises a wind cover 210 which is communicated with the top of the machine cover 110, and an air induction fan 220 is arranged on one side of the wind cover 210, the air inlet end of the air induction fan 220 is communicated with the wind cover 210, the air outlet end of the air induction fan 220 is communicated with a wind guide pipe 230, and the end of the wind guide pipe 230 which is far away from the air induction fan 220 is communicated with the lower part of the inner cavity of the machine cover 110. Through the air induction mechanism 200, the heat can be quickly sucked into the heat exchange mechanism 300, so that the waste heat recovery operation of the rolled metal material can be realized.

[0045] The heat exchange mechanism 300 comprises a plate heat exchanger 310 which is fixedly connected to the upper part of the inner cavity of the machine cover 110, and the bottom of the plate heat exchanger 310 is communicated with a wind collecting cover 320. Through the wind collecting cover 320, the heat in the machine cover 110 can be gathered and guided. The wind collecting cover 320, the plate heat exchanger 310, the wind cover 210, the auxiliary air induction fan 220, the wind guide pipe 230 and the machine cover 110 form a gas flow channel.

[0046] The steam generator 400 comprises a steam tank 410 which is arranged on one side of the machine cover 110, and the top of the steam tank 410 is communicated with a steam outlet pipe 420, the steam outlet pipe 420 is internally provided with a steam-water separation device, and the steam tank 410 is communicated with the plate heat exchanger 310 through a circulating mechanism 500. One side of the steam tank 410 is provided with a liquid level meter 430 which is connected to the steam tank 410 through a flange. Through the liquid level meter 430, the liquid level in the steam tank 410 can be observed in real time.

[0047] The circulating mechanism 500 comprises a circulating pump 510 which is arranged below the steam tank 410, the inlet end of the circulating pump 510 is communicated with the outlet end of the steam tank 410, the outlet end of the circulating pump 510 is communicated with a soft pipe A 520, the inlet end of the steam tank 410 is communicated with a soft pipe B 530, and the other end of the soft pipe B 530 and the other end of the soft pipe A 520 are respectively communicated with a liquid guide pipe 540. The other end of one of the liquid guide pipes 540 is communicated with the inlet end of the plate heat exchanger 310, and the other end of the other liquid guide pipe 540 is communicated with the outlet end of the plate heat exchanger 310. The steam tank 410, the circulating pump 510, the soft pipe A 520, one of the liquid guide pipes 540, the plate heat exchanger 310, the other liquid guide pipe 540 and the soft pipe B 530 form a medium flow channel.

[0048] The water softener 600 comprises a soft water tank 610, the outlet end of the soft water tank 610 is communicated with a soft pipe C 620, the other end of the soft pipe C 620 is communicated with a water supplementing pump 630, the water supplementing pump 630 is arranged below the steam tank 410 and is communicated with the water supplementing port of the steam tank 410, the inlet end of the soft water tank 610 is communicated with an external water source, and the inlet and outlet ends of the soft pipe C 620, the soft pipe A 520, the soft pipe B 530 and the plate heat exchanger 310 are respectively provided with valves.

[0049] The supporting mechanism 700 comprises a bracket assembly 710 located below the inner cavity of the hood 110, and a movable wheel 720 is arranged at each corner of the bottom of the bracket assembly 710; the bracket assembly 710 comprises a horizontal supporting plate 711, and a limiting seat 712 is fixedly connected to each of the front and rear sides of the top of the supporting plate 711, so as to limit the rolling metal material supported on the supporting plate 711, avoid the rolling metal material from shaking on the supporting plate 711, and thus help to improve the supporting stability of the supporting mechanism 700; the opposite sides of the two limiting seats 712 are each provided with an inclined surface, and the two inclined surfaces are symmetrically arranged about the center of the supporting plate 711, so as to support rolling metal materials of different sizes.

[0050] The steam tank 410 and the bottom of the soft water tank 610 are each fixedly connected with a support 800, which can support and raise the steam tank 410 and the soft water tank 610, so as to subsequently hide and install the circulating pump 510 and the water replenishing pump 630 for improving the overall tidiness and aesthetics.

[0051] The control system is electrically connected with the rodless cylinder 133, the air blower 220, the liquid level meter 430, the circulating pump 510, the soft water tank 610, the water replenishing pump 630, and the valve; the liquid level meter 430 can send a liquid level signal of the steam tank 410 to the control system, the control system receives the liquid level signal and controls the operation of the water replenishing pump 630 and the valve on the hose C620 to achieve the purpose of controlling the liquid level; the air blower 220 and the circulating pump 510 are each driven by a servo motor, and can be adjusted according to the cooling time of the rolled metal material after the later process requirement to control the flow of the hot gas and the heat-conducting medium, so as to realize the uniform cooling of the metal material and optimize the performance of the metal material.

[0052] Example 3

[0053] As shown in Figure 9 The rolling metal material waste heat recovery method provided by the present embodiment utilizes the rolling metal material waste heat recovery device described above to recover and process the waste heat of the rolling metal material, and specifically comprises the following steps:

[0054] S1, placing the rolled metal material: the temperature of 480 ℃, 22.5 tons of rolled metal material from the storage area to the supporting plate 711 is hoisted to the supporting plate 711, so that the supporting plate 711 supports it, and is limited by the limiting seat 712, and is moved to the inner cavity below the machine cover 110 by the moving wheel 720; the rodless cylinder 133 is started, so that the slide of the rodless cylinder 133 drives the protrusion 132 to move downward synchronously with the lower baffle 131 until the maximum limit, and then the rolled metal material is placed in a relatively closed space, effectively limiting the heat in the space, facilitating subsequent collection;

[0055] S2, waste heat recovery: 1 ton of normal temperature water is stored in the steam tank 410, the circulating pump 510 is started, the circulating pump 510 transports the normal temperature water in the steam tank 410 to the plate heat exchanger 310 through the hose A 520 and one of the liquid guide pipes 540; the induced draft fan 220 is started, the induced draft fan 220 sucks the heat in the inner cavity of the machine cover 110 into the plate heat exchanger through the air collector 320, after heat exchange by the plate heat exchanger 310, the gas is blown into the inner cavity of the machine cover 110 in turn through the air collector 210, the induced draft fan 220 and the air guide pipe 230, to realize cyclic heat exchange, the ventilation hole 111 can play an auxiliary compensation role for the air in the machine cover 110; the heated liquid is transported to the inner cavity of the steam tank 410 through the other liquid guide pipe 540 and the hose B 530, thereby realizing the effect of cyclic heat conduction; after waiting for 60 min, the steam in the steam tank 410 begins to emerge through the steam outlet pipe 420, and the water level in the steam tank 410 also begins to change, after 18 h, the temperature of the metal material is reduced to 200 ℃, through water level calculation, 850 kg of water in the steam tank 410 is evaporated in 18 h, the surface temperature of the rolled metal material does not change, and the roll changing continues the waste heat recovery, through average digital calculation, the rolled metal material between 480~500 ℃, the gas production of ton rolled metal material is about 38 kg, so the metal material cooling rate and steam quantity parameters are obtained, and the scale tunnel type waste heat recovery treatment can be carried out, the water and the steam are separated by the water-steam separation device, and the saturated steam separated finally can be directly connected to the steam pipe network or used for power generation;

[0056] S3, water replenishment: the liquid level meter 430 observes the liquid surface in the steam tank 410 in real time and can send the liquid level signal of the steam tank 410 to the control system, the control system receives the liquid level signal and controls the water replenishment pump 630 to start and the valve on the hose C 620 to open, so that the water replenishment pump 630 transports the soft water in the soft water tank 610 to the inner cavity of the steam tank 410 through the hose C 620 and the water replenishment pump 630, to achieve the purpose of controlling the liquid level in the steam tank 410.

[0057] The skilled in the art can easily implement the present application through the above specific embodiments. However, it should be understood that the present application is not limited to the above specific embodiments. On the basis of the disclosed embodiments, the skilled in the art can arbitrarily combine different technical features to implement different technical solutions.

Claims

1. A waste heat recovery device for rolled metal materials, characterized in that, The utility model relates to a heat exchange device for rolling metal material, which comprises a cover body mechanism (100) provided with an auxiliary air guide mechanism (200) for conveying heat from below to above in the inner cavity of the cover body mechanism (100), wherein the inner cavity of the cover body mechanism (100) is sequentially provided from top to bottom with a heat exchange mechanism (300) for heat exchange between hot gas and heat conducting medium and a supporting mechanism (700) for supporting the rolling metal material, the cover body mechanism (100) is used for providing a supporting base for the auxiliary air guide mechanism (200) and the heat exchange mechanism (300) and can form a relatively closed space, one side of the cover body mechanism (100) is provided with a steam generator (400) capable of heating water into hot water or steam by using heat energy, a circulation mechanism (500) for realizing circulation heat conduction is arranged between the steam generator (400) and the heat exchange mechanism (300), and one side of the steam generator (400) is provided with a soft water device (600) for supplying soft water to the steam generator (400). The cover body mechanism (100) comprises a machine cover (110), the front side of the machine cover (110) is in an open structure, the upper part of the front side of the machine cover (110) is fixedly connected with an upper baffle (120), and the lower part of the front side of the machine cover (110) is provided with an opening and closing assembly (130); the opening and closing assembly (130) comprises a lower baffle (131) movably connected to the front side of the machine cover (110), the two sides of the lower baffle (131) are fixedly connected with a protruding block (132), the two sides of the front side of the machine cover (110) are vertically and fixedly connected with a rodless cylinder (133), the rodless cylinder (133) is arranged in one-to-one correspondence with the protruding block (132), and the slide table of the rodless cylinder (133) is fixedly connected with one side of the protruding block (132). The heat exchange mechanism (300) comprises a plate heat exchanger (310). The steam generator (400) comprises a steam tank (410), the steam tank (410) is located on one side of the machine cover (110), the top of the steam tank (410) is communicated with a steam outlet pipe (420), the steam outlet pipe (420) is provided with a steam-water separation device, and the steam tank (410) is communicated with the plate heat exchanger (310) through the circulation mechanism (500). The supporting mechanism (700) comprises a bracket assembly (710), the bracket assembly (710) is located below the inner cavity of the machine cover (110), and the four corners of the bottom of the bracket assembly (710) are provided with a moving wheel (720). The auxiliary air guide mechanism (200) comprises a fan cover (210), the fan cover (210) is communicated with the top of the machine cover (110), one side of the fan cover (210) is provided with an air guide fan (220), the air inlet end of the air guide fan (220) is communicated with the fan cover (210), the air outlet end of the air guide fan (220) is communicated with a wind guide pipe (230), and the end, away from the air guide fan (220), of the wind guide pipe (230) is communicated with the inner cavity of the machine cover (110).

2. The apparatus according to claim 1, wherein: ​ 3. The apparatus according to claim 2, wherein: The circulating mechanism (500) comprises a circulating pump (510) located below the steam tank (410), an inlet end of the circulating pump (510) being communicated with an outlet end of the steam tank (410), an outlet end of the circulating pump (510) being communicated with a hose A (520), an inlet end of the steam tank (410) being communicated with a hose B (530), the hose B (530) and the other end of the hose A (520) being respectively communicated with a liquid guide pipe (540); the control system, the rodless cylinder (133) and the circulating pump (510) being electrically connected with the control system, the circulating pump (510) being driven by a servo motor.

4. The apparatus according to claim 3, wherein: The other end of one of the liquid guide pipes (540) is communicated with an inlet end of the plate heat exchanger (310), the other end of the other liquid guide pipe (540) is communicated with an outlet end of the plate heat exchanger (310), the steam tank (410), the circulating pump (510), the hose A (520), one of the liquid guide pipes (540), the plate heat exchanger (310), the other liquid guide pipe (540) and the hose B (530) forming a medium flow channel.

5. The apparatus according to claim 4, wherein: The water softener (600) comprises a soft water tank (610), an outlet end of the soft water tank (610) being communicated with a hose C (620), the other end of the hose C (620) being communicated with a water supplement pump (630), the water supplement pump (630) being located below the steam tank (410) and being communicated with a water supplement inlet end of the steam tank (410), an inlet end of the soft water tank (610) being communicated with an external water source, the hose C (620), the hose A (520), the hose B (530) and the inlet and outlet ends of the plate heat exchanger (310) being respectively provided with valves.

6. The apparatus according to claim 5, wherein: The bracket assembly (710) comprises a supporting plate (711), a limiting seat (712) is fixedly connected to each of the front and rear sides of the top of the supporting plate (711), one side of each of the two limiting seats (712) is provided with an inclined surface, and the two inclined surfaces are symmetrically arranged about the center of the supporting plate (711).

7. The apparatus according to claim 6, wherein: The plate heat exchanger (310) is fixedly connected to the upper portion of the inner cavity of the machine cover (110), the bottom of the plate heat exchanger (310) is communicated with a wind collecting cover (320), the wind collecting cover (320), the plate heat exchanger (310), the air cover (210), the air guide fan (220), the air guide pipe (230) and the machine cover (110) form a flow channel.

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