Investment casting shell burning waste heat recovery device

Abstract

The utility model relates to the technical field of waste heat recovery, and one embodiment of the utility model provides an investment casting shell burning waste heat recovery device which comprises a shell, a heat exchange space, a gas inlet and a gas outlet, the gas inlet and the gas outlet are communicated with the heat exchange space, and the gas inlet is communicated with a waste gas outlet of a heat furnace; the choke plate is arranged in the heat exchange space, a gap is formed between the choke plate and the side wall of the heat exchange space, and the choke plate is used for delaying the time that waste gas leaves the heat exchange space; the heat exchange coil pipes are arranged between the side wall of the heat exchange space and the choke plate, and the heat exchange coil pipes are used for increasing the heat exchange area between water and waste gas. According to the technical scheme, the problem that the fuel utilization efficiency is low due to the fact that a large amount of heat energy is mixed in waste gas in the using process of a heat furnace in the related technology is solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of waste heat recovery, in particular to a lost foam casting shell waste heat recovery device. BACKGROUND

[0002] In the melting casting process, various workpieces need to be processed with a hot furnace. In order to ensure the temperature inside the furnace and the combustion effect, air is continuously blown into the furnace to ensure sufficient oxygen content in the furnace. In this process, a large amount of high-temperature waste heat is generated. In the traditional lost foam casting shell process, this waste heat is often directly discharged into the environment, not only causing a huge waste of energy, but also increasing the thermal load of the surrounding environment. With the continuous rise of energy costs and the increasing strictness of environmental protection requirements, how to effectively recover and utilize this part of waste heat has become a problem to be solved in the lost foam casting industry. CONTENT OF THE UTILITY MODEL

[0003] To overcome the above defects, embodiments of the present disclosure provide a lost foam casting shell waste heat recovery device, which solves the problem of low fuel utilization efficiency caused by the large amount of heat energy mixed in the waste gas of the hot furnace during use in the related art.

[0004] According to one aspect, at least one embodiment of the present disclosure provides a lost foam casting shell waste heat recovery device for recovering and utilizing the heat in the waste gas of a hot furnace, comprising:

[0005] a housing having a heat exchange space, an air inlet and an air outlet communicating with the heat exchange space, the air inlet communicating with the waste gas outlet of the hot furnace;

[0006] a wind baffle arranged in the heat exchange space, the wind baffle having a spacing with the side wall of the heat exchange space, and the wind baffle is used to delay the time of the waste gas leaving the heat exchange space;

[0007] a plurality of heat exchange coils arranged on the side wall of the heat exchange space and the wind baffle.

[0008] For example, in the lost foam casting shell waste heat recovery device provided by at least one embodiment of the present disclosure, the wind baffle is located between the air inlet and the air outlet.

[0009] For example, in the lost foam casting shell waste heat recovery device provided by at least one embodiment of the present disclosure, the cross-sectional area of the heat exchange space is A, the cross-sectional area of the wind baffle is B, and the cross-sectional area of the air inlet and the air outlet is C, A-B>C.

[0010] For example, in the lost foam casting shell waste heat recovery device provided by at least one embodiment of the present disclosure, further comprising:

[0011] A plurality of fixing plates are detachably arranged on the shell, the fixing plates are provided with a plurality of mounting holes, and a fixing space is formed between the fixing plates and the shell, and the fixing space is used for fixing the heat exchange coil on the shell.

[0012] A plurality of mounting bolts are detachably arranged on the shell, the mounting bolts are connected with the shell through the mounting holes, and the mounting bolts are used for fixing the fixing plates.

[0013] For example, the shell of the lost foam casting shell burning waste heat recovery device provided by at least one embodiment of the present disclosure comprises:

[0014] A support frame;

[0015] A plurality of outer baffles are arranged on the support frame, and the outer baffles form the heat exchange space.

[0016] A top cover is detachably arranged on the top of the support frame, and the top cover is used for opening or closing the heat exchange space.

[0017] For example, the lost foam casting shell burning waste heat recovery device provided by at least one embodiment of the present disclosure further comprises:

[0018] A thermal insulation layer is arranged on the outer baffles and the top cover, the thermal insulation layer is located outside the heat exchange space, and the thermal insulation layer is used for reducing heat loss in the heat exchange space.

[0019] For example, the lost foam casting shell burning waste heat recovery device provided by at least one embodiment of the present disclosure further comprises:

[0020] A water inlet main pipe is arranged outside the shell, and one end of each of the heat exchange coils is in communication with the water inlet main pipe.

[0021] A water outlet main pipe is arranged outside the shell, and the other end of each of the heat exchange coils is in communication with the water outlet main pipe, and the water outlet main pipe is used for conveying water after heat exchange.

[0022] A heat preservation tank is arranged on one side of the shell, the water outlet main pipe is in communication with the heat preservation tank, and the heat preservation tank is used for storing water after heat exchange.

[0023] For example, the lost foam casting shell burning waste heat recovery device provided by at least one embodiment of the present disclosure, the bottom of the heat exchange space has a cleaning port, and further comprises:

[0024] A dust hopper is slidably arranged on the cleaning port, and the dust hopper enters or exits the heat exchange space after sliding, and the dust hopper is used for storing or cleaning dust in the heat exchange space.

[0025] For example, in a waste heat recovery device for burnt shells in investment casting provided in at least one embodiment of this disclosure, the ash cleaning hopper also has the heat insulation layer. After the ash cleaning hopper enters the heat exchange space, the heat insulation layer on the ash cleaning hopper closes the cleaning port.

[0026] For example, in at least one embodiment of this disclosure, a waste heat recovery device for investment casting shell burning also includes:

[0027] A handle is provided on the dust removal hopper.

[0028] The beneficial effects of the embodiments disclosed herein are as follows:

[0029] In this disclosure, when the furnace is operating, the exhaust gas generated by the furnace enters the heat exchange space through the inlet and is blown onto the baffle plate. After being blocked by the baffle plate, it finally leaves the heat exchange space through the outlet. The heat exchange coils are arranged in a plate-like pattern on the side wall of the heat exchange space. The baffle plate can delay the residence time of the exhaust gas in the heat exchange space to a certain extent, while also ensuring that the exhaust gas passes through multiple heat exchange coils on the side wall of the heat exchange space, effectively improving heat exchange efficiency. This enhances the utilization efficiency of the heat from the exhaust gas. The plate-like heat exchange coils have a large number of gaps between them, which can minimize their own obstruction of the exhaust gas and ensure that the exhaust gas can be discharged normally from the outlet.

[0030] The advantages of this design lie in the fact that the heat exchange space within the shell, along with its connected air inlet and outlet, provides an effective location and channel for waste heat recovery from the exhaust gas. The baffle plate delays the time it takes for the exhaust gas to leave the heat exchange space, allowing it to remain there longer and thus increasing the heat exchange time between the exhaust gas and the water in the heat exchange coils, thereby improving waste heat recovery efficiency. Multiple heat exchange coils distributed on the side walls of the heat exchange space and the baffle plate significantly increase the heat exchange area between the water and the exhaust gas, enabling more thorough absorption of heat from the exhaust gas. The arrangement of the heat exchange coils effectively utilizes space, achieving waste heat recovery and utilization without affecting the exhaust gas discharge from the hot furnace, thus improving energy efficiency. The water after heat exchange is approximately 60-70℃, suitable for domestic use, providing convenience for employees' washing and other needs. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0032] Figure 1 This is a schematic diagram of the waste heat recovery device in one embodiment of the present disclosure;

[0033] Figure 2 is a sectional view of the waste heat recovery device in the present disclosure;

[0034] Figure 3 is a structural schematic view of the support frame and the outer baffle in the present disclosure;

[0035] Figure 4 is a connection schematic view of the water inlet main pipe, the heat exchange coil and the water outlet main pipe in the present disclosure;

[0036] Figure 5 is a structural schematic view of the support frame and the heat exchange coil in the present disclosure;

[0037] Figure 6 is a partial enlarged view of A in the present disclosure. Figure 5

[0038] In the figure: 1, shell, 110, heat exchange space, 120, air inlet, 130, air outlet, 2, wind baffle, 3, heat exchange coil, 4, fixed plate, 410, mounting hole, 420, fixed space, 5, mounting bolt, 140, support frame, 150, outer baffle, 160, top cover, 171, first heat insulation layer, 310, water inlet main pipe, 320, water outlet main pipe, 6, heat insulation tank, 180, cleaning port, 7, ash bucket, 172, second heat insulation layer, 710, handle. DETAILED DESCRIPTION

[0039] The present disclosure will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present disclosure, but not to limit the present disclosure.

[0040] In order to make the drawing simple, only the parts related to the disclosure are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the components with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0041] In this paper, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0042] ​In the present disclosure, unless explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0043] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0044] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0045] As shown in Figures 1-6 The present disclosure provides a molten mold casting burning shell waste heat recovery device, which comprises a shell 1 having a heat exchange space 110 and a gas inlet 120 and a gas outlet 130 communicating with the heat exchange space 110, the gas inlet 120 communicating with the exhaust gas outlet of a hot stove; a wind baffle 2 is arranged in the heat exchange space 110, the wind baffle 2 has a spacing with the side wall of the heat exchange space 110, and the wind baffle 2 is used to delay the time for the exhaust gas to leave the heat exchange space 110; a plurality of heat exchange coils 3 are arranged on the side wall of the heat exchange space 110 and the wind baffle 2, and the heat exchange coils 3 have water flow therein, and the heat exchange coils 3 are used to increase the heat exchange area between the water and the exhaust gas.

[0046] In actual application, when the hot stove is working, the exhaust gas generated by the hot stove enters the heat exchange space 110 through the gas inlet 120 and blows on the wind baffle 2, and finally leaves the heat exchange space 110 through the gas outlet 130 after being blocked by the wind baffle 2. The heat exchange coil 3 is in sheet type and arranged on the side wall of the heat exchange space 110, the wind baffle 2 can delay the time for the exhaust gas to stay in the heat exchange space 110 to a certain extent, and at the same time can ensure that the exhaust gas passes through the plurality of heat exchange coils 3 on the side wall of the heat exchange space 110, effectively improving the heat exchange efficiency and improving the utilization efficiency of the exhaust gas heat. The sheet type heat exchange coil 3 can reduce the blockage of the exhaust gas as much as possible, and ensure that the exhaust gas can be normally discharged through the gas outlet 130.

[0047] The advantages of this design are that the heat exchange space 110, the air inlet 120 and the air outlet 130 are arranged in the shell 1, providing an effective place and channel for waste heat recovery. The arrangement of the air baffle 2 can delay the time for the exhaust gas to leave the heat exchange space 110, so that the exhaust gas stays in the heat exchange space 110 for a longer time, thereby increasing the heat exchange time between the exhaust gas and the water flow in the heat exchange coil 3 and improving the waste heat recovery efficiency. The multiple heat exchange coils 3 are distributed on the side wall of the heat exchange space 110 and the air baffle 2, greatly increasing the heat exchange area between the water and the exhaust gas and enabling more sufficient absorption of heat from the exhaust gas. This design structure is compact and effectively utilizes the space, achieving the recovery and utilization of waste heat without affecting the exhaust of the hot stove, improving the energy utilization efficiency and reducing the production cost. Through the recovery of waste heat, the waste of heat is reduced, which is helpful for energy saving and emission reduction and has a positive significance for environmental protection.

[0048] In some examples, the air inlet 120 and the air outlet 130 are located on both sides of the heat exchange space 110, and the air baffle 2 is located between the air inlet 120 and the air outlet 130.

[0049] In actual application, the position of the air baffle 2 between the air inlet 120 and the air outlet 130 corresponds to the position of the air inlet 120, ensuring that the exhaust gas entering from the air inlet 120 directly blows against the air baffle 2 and is changed in flow direction by the air baffle 2, ensuring that the multiple heat exchange coils 3 located on the side wall of the heat exchange space 110 are in sufficient contact with the exhaust gas. The air baffle 2 located between the air inlet 120 and the air outlet 130 can effectively block the straight-line flow of the exhaust gas, promote the exhaust gas to flow in a detour in the heat exchange space 110, prolong the residence time of the exhaust gas in the heat exchange space 110, thereby improving the sufficiency of heat exchange and the waste heat recovery effect, helping to balance the pressure distribution in the heat exchange space 110, reducing the situation of local over-high or over-low pressure, ensuring the stability and uniformity of the exhaust gas flow, and further improving the working efficiency and reliability of the entire waste heat recovery device.

[0050] In some examples, the cross-sectional area of the heat exchange space 110 is A, the cross-sectional area of the air baffle 2 is B, and the cross-sectional area of the air inlet 120 and the air outlet 130 is C, A-B>C.

[0051] In actual application, the total area of the gap between the cross-sectional area of the air baffle 2 and the heat exchange space 110 is greater than the cross-sectional area of the air inlet 120. Although the exhaust gas will pass through the waste heat recovery device for heat exchange during the exhaust process of the hot stove, the exhaust volume will not be affected by the waste heat recovery device, ensuring that the exhaust gas generated in the hot stove is fully discharged, and ensuring the production environment in the workshop.

[0052] The advantage of this design is to ensure that the effective flow area of the heat exchange space 110 after removing the baffle plate 2 is larger than the area of the air inlet 120 and the air outlet 130, which helps to maintain the proper flow rate of the exhaust gas in the heat exchange space 110, avoiding excessive flow rate that leads to insufficient heat exchange. At the same time, after passing through the baffle plate 2, the exhaust gas has enough space to diffuse and flow, thereby more uniformly contacting the heat exchange coil 3, improving the uniformity and efficiency of heat exchange. The larger effective flow area can also reduce the resistance of exhaust gas flow, reduce energy consumption, and also reduce the pressure requirement on the exhaust equipment such as the fan, thereby reducing the equipment cost and operating energy consumption. It provides favorable conditions for sufficient heat exchange between the exhaust gas and the heat exchange coil 3 under the premise of ensuring smooth exhaust, improving the performance and stability of the waste heat recovery device. The reasonable area relationship helps to optimize the structure and working parameters of the device, making it better adapt to the waste heat recovery needs under different working conditions, improving the versatility and practicality of the device.

[0053] In some examples, the fixed plate 4 is detachably arranged on the shell 1, and the fixed plate 4 has a plurality of mounting holes 410. A fixed space 420 is formed between the fixed plate 4 and the shell 1, and the fixed space 420 is used to fix the heat exchange coil on the shell 1. The mounting bolt 5 is detachably arranged on the shell 1, and the mounting bolt 5 is connected with the shell 1 through the mounting hole 410. The mounting bolt 5 is used to fix the fixed plate 4.

[0054] In actual application, the plurality of detachable fixed plates 4 provide a stable fixing method for the heat exchange coil 3, ensuring that the heat exchange coil 3 will not be displaced due to vibration or airflow impact during operation, thereby ensuring the stability and reliability of the device. The plurality of mounting holes 410 on the fixed plate 4 and the mounting bolt 5 cooperating with them make the installation and removal of the fixed plate 4 simple and fast, facilitating the maintenance and replacement of the heat exchange coil 3. This detachable fixing structure facilitates individual repair or replacement when the heat exchange coil 3 fails or is damaged, reducing maintenance cost and time. The mounting bolt 5 is connected with the shell 1 through the mounting hole 410, which can provide uniform fastening force to make the fixed plate 4 tightly combined with the shell 1, thereby enhancing the firmness of the fixing.

[0055] In some examples, the shell 1 includes: a plurality of outer baffles 150 arranged on the support frame 140, and the plurality of outer baffles 150 form the heat exchange space 110; and a top cover 160 detachably arranged on the top of the support frame 140, and the top cover 160 is used to open or close the heat exchange space 110.

[0056] In practical applications, the heat exchange space 110 composed of several outer baffles 150 makes the manufacturing and installation of the shell 1 more flexible, and the detachable top cover 160 facilitates the maintenance and repair work inside the heat exchange space 110. The top cover 160 can be quickly opened for equipment inspection, cleaning and component replacement, etc., improving the maintenance efficiency. The top cover 160 is used to open or close the heat exchange space 110, which can be kept closed during normal operation of the equipment to ensure the stability and safety of the heat exchange process; when maintenance is needed, it can be easily opened, increasing the convenience of operation.

[0057] In some examples, a first thermal insulation layer 171 is provided on the outer baffle 150 and the top cover 160, and the first thermal insulation layer 171 is located outside the heat exchange space 110. The first thermal insulation layer 171 is used to reduce heat loss inside the heat exchange space 110.

[0058] In practical applications, the first thermal insulation layer 171 provided on the outer baffle 150 and the top cover 160 can effectively reduce the heat loss inside the heat exchange space 110, improve the efficiency of waste heat recovery, and make more heat be transferred to the water in the heat exchange coil 3, thereby achieving full utilization of energy. The first thermal insulation layer 171 reduces the transfer of heat to the external environment, helps to maintain the temperature stability inside the heat exchange space 110, reduces the influence of temperature fluctuations on the heat exchange effect, and ensures the stable operation of the device.

[0059] In some examples, the water inlet main pipe 310 is provided outside the shell 1, and one end of each of the plurality of heat exchange coils 3 is in communication with the water inlet main pipe 310; the water outlet main pipe 320 is provided outside the shell 1, and the other end of each of the plurality of heat exchange coils 3 is in communication with the water outlet main pipe 320, and the water outlet main pipe 320 is used to transport the water after heat exchange; the heat preservation tank 6 is provided on one side of the shell 1, and the water outlet main pipe 320 is in communication with the heat preservation tank 6, and the heat preservation tank 6 is used to store the water after heat exchange.

[0060] In practical applications, the water inlet main pipe 310 and the water outlet main pipe 320 are respectively in communication with the plurality of heat exchange coils 3, realizing unified supply and collection of water, making the water flow path unified, and facilitating management and control. The setting of the heat preservation tank 6 can effectively store the hot water after heat exchange, avoiding rapid heat loss of the hot water, and the hot water can be fully utilized when needed, improving the energy utilization efficiency. The heat preservation tank 6 is arranged on one side of the shell 1, which is reasonable in layout, reduces the length and complexity of the pipeline, and reduces energy loss and cost.

[0061] In some examples, the heat exchange space 110 has a cleaning port 180 at the bottom, and further comprises: a dust cleaning bucket 7 slidingly arranged on the cleaning port 180, the dust cleaning bucket 7 slidingly enters or exits the heat exchange space 110, and the dust cleaning bucket 7 is used for storing or cleaning dust in the heat exchange space 110. The dust cleaning bucket 7 has a second heat preservation layer 171, and the second heat preservation layer 171 on the dust cleaning bucket 7 closes the cleaning port 180 after the dust cleaning bucket 7 enters the heat exchange space 110. A handle 710 is arranged on the dust cleaning bucket 7.

[0062] In actual application, the heat exchange space 110 has the cleaning port 180 and the slidable dust cleaning bucket 7 at the bottom, which facilitates regular cleaning of dust accumulated in the heat exchange space 110, ensures the heat exchange efficiency and normal operation of the equipment. The dust cleaning bucket 7 can slide into or exit the heat exchange space 110, which is simple and convenient to operate and improves the efficiency of cleaning work. The dust cleaning bucket 7 is used for storing dust, which is convenient for centralized treatment. The dust cleaning bucket 7 is provided with the first heat preservation layer 171, which can close the cleaning port 180 when the dust cleaning bucket 7 enters the heat exchange space 110, effectively reducing heat loss from the cleaning port 180, maintaining the temperature stability of the heat exchange space 110 and improving the energy utilization efficiency. The handle 710 is arranged to facilitate the push-pull operation of the dust cleaning bucket 7, making the cleaning work more labor-saving.

[0063] It should be noted that the above examples are only used to illustrate the technical solutions of the present disclosure, not to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, which should be covered in the scope of the claims of the present disclosure.

Claims

1. A fused mold casting burned shell waste heat recovery device for recycling heat in hot furnace high temperature exhaust gas, characterized by, The application relates to a heat exchange device for high-temperature waste gas, which comprises the following parts: a shell (1) with a heat exchange space (110) and an air inlet (120) and an air outlet (130) communicating with the heat exchange space (110), wherein the air inlet (120) communicates with a waste gas outlet of a hot stove; a wind-resisting plate (2) arranged in the heat exchange space (110), wherein the wind-resisting plate (2) has a spacing with the side wall of the heat exchange space (110), and the wind-resisting plate (2) is used for delaying the time for high-temperature waste gas to leave the heat exchange space (110); a plurality of heat exchange coils (3) arranged in the heat exchange space (110); the application further comprises: a water inlet main pipe (310) arranged outside the shell (1), wherein one end of each of the heat exchange coils (3) communicates with the water inlet main pipe (310); a water outlet main pipe (320) arranged outside the shell (1), wherein the other end of each of the heat exchange coils (3) communicates with the water outlet main pipe (320), and the water outlet main pipe (320) is used for conveying water after heat exchange to leave; a heat preservation tank (6) arranged on one side of the shell (1), wherein the water outlet main pipe (320) communicates with the heat preservation tank (6), and the heat preservation tank (6) is used for storing water after heat exchange.

2. A device for recovering heat from a burnt shell of a fused mold casting according to claim 1, wherein The wind-resisting plate (2) is located between the air inlet (120) and the air outlet (130).

3. A device for recovering heat from a shell of a fused mould casting according to claim 1, characterised in that The cross-sectional area of the heat exchange space (110) is A, the cross-sectional area of the wind-resisting plate (2) is B, and the cross-sectional area of the air inlet (120) and the air outlet (130) is C, and A-B>C.

4. The exothermic heat recovery device for fused mold casting according to claim 1, wherein The shell (1) has a supporting frame (140), and further comprises: a plurality of fixing plates (4) which are detachably arranged on the shell (1), wherein the fixing plates (4) are provided with a plurality of mounting holes (410), a fixing space (420) is formed between the fixing plates (4) and the shell (1), and the fixing space (420) is used for fixing the heat exchange coils (3) on the shell (1); a plurality of mounting bolts (5) which are detachably arranged on the shell (1), wherein the mounting bolts (5) pass through the mounting holes (410) and are connected with the shell (1), and the mounting bolts (5) are used for fixing the fixing plates (4).

5. A device for recovering heat from a burnt shell of an investment casting according to claim 4, wherein The shell (1) further comprises: a plurality of outer baffles (150) arranged on the supporting frame (140), wherein the outer baffles (150) form the heat exchange space (110); a top cover (160) which is detachably arranged on the top of the supporting frame (140), and the top cover (160) is used for opening or closing the heat exchange space (110).

6. A device for recovering heat from a burnt shell of an investment casting according to claim 5, wherein The application further comprises: a first heat preservation layer (170) arranged on the outer baffles (150) and the top cover (160), wherein the first heat preservation layer (170) is located outside the heat exchange space (110), and the first heat preservation layer (170) is used for reducing heat loss in the heat exchange space (110).

7. A device for recovering heat from a shell of an investment casting according to claim 6, wherein The bottom of the heat exchange space (110) is provided with a cleaning port (180), and the application further comprises: A dust cleaning hopper (7) is slidably arranged on the cleaning port (180), and the dust cleaning hopper (7) enters or leaves the heat exchange space (110) after sliding, and the dust cleaning hopper (7) is used for storing or cleaning dust in the heat exchange space (110).

8. A device for recovering heat from a shell of an investment casting according to claim 7, wherein The dust cleaning hopper (7) is provided with a second heat preservation layer (172), and the second heat preservation layer (172) on the dust cleaning hopper (7) closes the cleaning port (180) after the dust cleaning hopper (7) enters the heat exchange space (110).

9. A device for recovering heat from a shell of an investment casting according to claim 7, wherein Further comprising: A handle (710) is arranged on the dust cleaning hopper (7).

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