Casting waste heat recycling device

Abstract

The utility model relates to the field of casting equipment, in particular to a casting waste heat recycling device which comprises a heat absorption unit, a storage unit, a recycling unit and a support, the heat absorption unit is provided with a hopper and a first heat exchange pipe, the recycling unit is provided with a storage box and a second heat exchange pipe, and the storage unit is provided with a cold liquid storage assembly and a hot liquid storage assembly. According to the heat exchange system, stored cold-state heat conduction oil can be fed into the first heat exchange pipe to conduct heat exchange and cooling on hot molding sand in the heat absorption unit, and hot-state heat conduction oil which flows back into the storage unit after heat exchange can be fed into the second heat exchange pipe to heat materials in the recycling unit. Heat conduction oil circularly flows among the first heat exchange pipe, the storage unit and the second heat exchange pipe to carry out cold and heat exchange, heat exchange cooling can be carried out on hot molding sand in the heat absorption unit, heat is stored by the storage unit, materials in the recycling unit can be heated, and therefore casting waste heat is recycled again, and the heat exchange efficiency is improved. The heat exchange efficiency can be improved; and the influence on the environment is reduced.

Description

Technical Field

[0001] The utility model relates to the field of casting equipment, and particularly relates to a casting waste heat recycling device. Background Art

[0002] When the workpiece is poured and formed during casting, the mold sand retains a relatively high amount of heat. Before the next pouring, the hot mold sand needs to be naturally cooled or forced cooled. Natural cooling takes a long time and the waste heat diffuses into the air, affecting the environment; forced cooling also requires wasting energy again. Therefore, people have always hoped to recycle the casting waste heat, for example, using the waste heat to dry the casting mold. Although currently, some people collect the waste heat through heat exchange with flowing air or water, most of these methods have low heat exchange efficiency. Moreover, air heat exchange is not easy to store heat, and water heat exchange easily generates water vapor, making the environment humid, which is not conducive to storing the casting mold or chill blocks that need to be dried around it. Considering that heat-conducting oil has high thermal stability and does not generate water vapor, and its molecular density is large, it is easy to transfer heat between molecules, resulting in high heat exchange efficiency. Therefore, if there is a recycling device that uses heat-conducting oil as a heat exchange medium to exchange heat and utilize the casting waste heat to improve the heat exchange efficiency and reduce the impact on the environment, this is the problem to be solved in this case. Content of the Utility Model

[0003] To overcome the deficiencies in the prior art, the utility model discloses a casting waste heat recycling device, which includes an endothermic unit, a storage unit, a recycling unit, and a support. The endothermic unit is provided with a hopper and a first heat exchange tube placed inside the hopper, and the hopper can hold the hot mold sand after casting; the recycling unit is provided with a storage box and a second heat exchange tube placed on the inner wall of the storage box, and heat-conducting oil can flow through both the first heat exchange tube and the second heat exchange tube; the storage unit is provided with a cold liquid storage component and a hot liquid storage component, which can send the stored cold heat-conducting oil into the first heat exchange tube to exchange heat and cool down the hot mold sand in the endothermic unit, and can send the hot heat-conducting oil that flows back to the storage unit after heat exchange into the second heat exchange tube to heat the materials in the recycling unit. The utility model uses heat-conducting oil with high heat exchange efficiency to circulate and flow between the first heat exchange tube, the storage unit, and the second heat exchange tube for heat and cold exchange, so as to exchange heat and cool down the hot mold sand in the endothermic unit, store heat by the storage unit, and heat the materials in the recycling unit, thereby recycling the casting waste heat, improving the heat exchange efficiency, and reducing the impact on the environment.

[0004] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0005] A casting waste heat recycling device, including a bracket, is characterized in that: it further includes a heat absorption unit, a storage unit and a recycling unit. The heat absorption unit is provided with a sand hopper and a heat exchange tube placed inside the sand hopper. The sand hopper can hold the hot mold sand after casting. The recycling unit is provided with a container box and a heat exchange tube placed on the inner wall of the container box. The container box can hold the material to be heated. The heat exchange tubes provided in the heat absorption unit and the recycling unit can both circulate heat-conducting oil. The storage unit is provided with an oil tank that can respectively hold cold and hot heat-conducting oil. The storage unit can send the stored cold heat-conducting oil into the heat exchange tube of the heat absorption unit to exchange heat and cool down the hot mold sand in the heat absorption unit, and can send the hot heat-conducting oil that flows back to the storage unit after heat exchange into the heat exchange tube of the recycling unit to heat the material in the recycling unit. The heat absorption unit, the storage unit and the recycling unit are arranged in sequence and are all fixedly connected to the bracket.

[0006] The heat absorption unit includes a hopper, a first heat exchange tube and a discharge valve. The hopper is a cavity body with a conical lower part and an open top. There is a discharge port at its bottom. The first heat exchange tube is placed in the cavity of the hopper and is fixedly connected to the hopper wall with a support rod. The discharge valve is connected to the discharge port at the bottom of the hopper.

[0007] The first heat exchange tube is a heat-conducting component formed by connecting several groups of parallel and vertically arranged serpentine heat transfer oil pipes, and its inlet end is lower than its outlet end.

[0008] The recycling unit includes a storage box, a second heat exchange tube and a material frame. The second heat exchange tube is fixedly connected to the inner side wall of the storage box. The material frame is a heat-conductive hollow frame and is placed in the middle of the storage box.

[0009] The storage box is a box-shaped cavity body with a box cover on the top. There are heat insulation layers on its box wall and box cover. The second heat exchange tube is a heat-conducting component prepared by making a heat transfer oil pipe into a spiral shape, and its inlet end is lower than its outlet end.

[0010] The storage unit includes a cold liquid storage component and a hot liquid storage component. The hot liquid storage component is detachably connected above the cold liquid storage component.

[0011] The cold liquid storage component includes a cold liquid box, a first oil pump and a first one-way valve. The cold liquid box is a box-shaped cavity body with an open top. There is a partition in the middle of it, and the height of the partition is lower than the side wall of the box body. The partition divides the cavity of the cold liquid box into a main partition cavity and a secondary partition cavity. The first oil pump is placed in the main partition cavity of the cold liquid box. The first oil pump is connected to the inlet end of the first heat exchange tube with an oil pipe. The first one-way valve is connected to the oil pipe communicating with the inlet end of the first heat exchange tube. The outlet end of the second heat exchange tube is connected to the secondary partition cavity of the cold liquid box with an oil pipe.

[0012] The described hot liquid storage assembly includes a hot liquid tank, a second oil pump, a second one-way valve, and a drain valve. The hot liquid tank is a box-shaped cavity with a lid on top, and heat insulation layers are provided on both its tank walls and the lid. The second oil pump is placed inside the hot liquid tank and is connected to the inlet end of the second heat exchange tube by an oil pipe. The second one-way valve is connected to the oil pipe communicating with the inlet end of the second heat exchange tube. The outlet end of the first heat exchange tube is connected to the hot liquid tank by an oil pipe. The bottom of the hot liquid tank is provided with a drain port, and this drain port is located above the auxiliary compartment of the cold liquid tank. The drain valve is connected to this drain port.

[0013] The described hot liquid storage assembly further includes a temperature sensor. The temperature sensor is placed inside the hot liquid tank and can detect the temperature of the oil liquid inside the hot liquid tank.

[0014] Level sensors are provided inside both the cold liquid tank of the cold liquid storage assembly and the hot liquid tank of the hot liquid storage assembly, and they can detect the oil levels of the oil liquid inside the cold liquid tank and the hot liquid tank.

[0015] As can be seen from the above description, the advantages of a foundry waste heat recovery device provided by the present utility model are as follows: integrating a storage unit that can store and supply cold and hot heat-conducting oil with an endothermic unit provided with a first heat exchange tube and a recycling unit provided with a second heat exchange tube, and using heat-conducting oil with high heat exchange efficiency to circulate between the first heat exchange tube, the storage unit, and the second heat exchange tube for heat and cold exchange, so as to exchange heat and cool down the hot molding sand in the endothermic unit, store heat by the storage unit, and heat the materials in the recycling unit, thereby recycling the foundry waste heat and improving the heat exchange efficiency and reducing the impact on the environment. The present utility model is reasonably designed, has a simple structure, low cost, and is convenient for popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall schematic diagram of a foundry waste heat recovery device described in the present utility model;

[0017] Figure 2 is the enlarged schematic diagram of the endothermic unit;

[0018] Figure 3 is Figure 2 the enlarged A-A schematic diagram in

[0019] Figure 4 is the enlarged schematic diagram of the storage unit;

[0020] Figure 5 is the enlarged schematic diagram of the cold liquid storage assembly;

[0021] Figure 6 is the enlarged schematic diagram of the hot liquid storage assembly;

[0022] Figure 7It is an enlarged schematic diagram of the recycling unit.

[0023] Reference numerals:

[0024] 1 Heat absorption unit; 11 Hopper; 12 First heat exchange tube; 13 Discharge valve; 2 Storage unit; 21 Cold liquid storage component; 211 Cold liquid tank; 212 First oil pump; 213 First one-way valve; 201 Liquid level sensor; 22 Hot liquid storage component; 221 Hot liquid tank; 222 Second oil pump; 223 Second one-way valve; 224 Drain valve; 225 Temperature sensor; 3 Recycling unit; 31 Storage box; 32 Second heat exchange tube; 33 Material frame; 4 Support. Specific embodiments

[0025] The present invention will be further described below through specific embodiments.

[0026] As Figure 1 shown, a casting waste heat recycling device according to the present invention includes a heat absorption unit 1, a storage unit 2, a recycling unit 3 and a support 4. The heat absorption unit 1 is provided with a sand hopper and a heat exchange tube placed inside the sand hopper, and the sand hopper can hold the hot mold sand after casting. The recycling unit 3 is provided with a storage box and a heat exchange tube placed on the inner wall of the storage box, and the storage box can hold the material to be heated. The heat exchange tubes provided in the heat absorption unit 1 and the recycling unit 3 can both circulate heat-conducting oil. The storage unit 2 is provided with oil tanks that can respectively hold cold and hot heat-conducting oil. The storage unit 2 can send the stored cold heat-conducting oil into the heat exchange tube of the heat absorption unit 1 to exchange heat and cool the hot mold sand in the heat absorption unit 1, and can send the hot heat-conducting oil that flows back to the storage unit 2 after heat exchange into the heat exchange tube of the recycling unit 3 to heat the material in the recycling unit 3. The heat absorption unit 1, the storage unit 2 and the recycling unit 3 are arranged in sequence and are all fixedly connected to the support 4.

[0027] As Figures 1 to 3 shown, the heat absorption unit 1 of the present invention includes a hopper 11, a first heat exchange tube 12 and a discharge valve 13. The hopper 11 is a cavity body with a conical lower part and an open top, and a discharge port is provided at its bottom. The first heat exchange tube 12 is a heat-conducting member formed by connecting a plurality of groups of parallel and vertically arranged serpentine heat transfer oil pipes, and its inlet end is lower than its outlet end. The first heat exchange tube 12 is placed in the cavity of the hopper 11 and is fixedly connected to the wall of the hopper 11 by a support rod. The discharge valve 13 is connected to the discharge port at the bottom of the hopper 11.

[0028] As Figure 1 and Figure 7As shown in the figure, the recycling unit 3 of the present utility model includes a storage box 31, a second heat exchange tube 32 and a material frame 33. The storage box 31 is a box-shaped cavity with a lid on the top, and heat insulation layers are provided on both its box walls and the lid. The second heat exchange tube 32 is a heat conduction member prepared by coiling a heat transfer oil pipe, and its inlet end is lower than its outlet end. The second heat exchange tube 32 is fixedly connected to the inner side wall of the storage box 31. The material frame 33 is a heat-conductive hollow frame body, which is placed in the middle of the storage box 31.

[0029] As Figures 1 to 7 shown in the figure, the storage unit 2 of the present utility model includes a cold liquid storage component 21 and a hot liquid storage component 22. The hot liquid storage component 22 is detachably connected above the cold liquid storage component 21. The cold liquid storage component 21 includes a cold liquid tank 211, a first oil pump 212 and a first one-way valve 213. The cold liquid tank 211 is a box-shaped cavity with an open top, and a partition with a height lower than the side wall of the box body is provided in the middle. The partition divides the cavity of the cold liquid tank 211 into a main partition cavity and a secondary partition cavity. In this embodiment, ventilation holes for heat dissipation are also provided on the upper side wall of the cold liquid tank 211. The first oil pump 212 is placed in the main partition cavity of the cold liquid tank 211. The first oil pump 212 is connected to the inlet end of the first heat exchange tube 12 by an oil pipe. The first one-way valve 213 is connected to the oil pipe communicating with the inlet end of the first heat exchange tube 12. The outlet end of the second heat exchange tube 32 is connected to the secondary partition cavity of the cold liquid tank 211 by an oil pipe. The hot liquid storage component 22 includes a hot liquid tank 221, a second oil pump 222, a second one-way valve 223, a drain valve 224 and a temperature sensor 225. The hot liquid tank 221 is a box-shaped cavity with a lid on the top, and heat insulation layers are provided on both its box walls and the lid. The second oil pump 222 is placed in the hot liquid tank 221. The second oil pump 222 is connected to the inlet end of the second heat exchange tube 32 by an oil pipe. The second one-way valve 223 is connected to the oil pipe communicating with the inlet end of the second heat exchange tube 32. The outlet end of the first heat exchange tube 12 is connected to the hot liquid tank 221 by an oil pipe. A drain port is provided at the bottom of the hot liquid tank 221 and this drain port is located above the secondary partition cavity of the cold liquid tank 211. The drain valve 224 is connected to this drain port. The temperature sensor 225 is placed in the hot liquid tank 221, and it can detect the oil temperature in the hot liquid tank 221. Liquid level sensors 201 are provided in both the cold liquid tank 211 of the cold liquid storage component 21 and the hot liquid tank 221 of the hot liquid storage component 22, and they can detect the oil levels of the oil in the cold liquid tank 211 and the hot liquid tank 221.

[0030] The usage method of a casting waste heat recycling device of the present utility model is as follows:

[0031] Load the hot molding sand that has not cooled after casting into the hopper 11 of the heat absorption unit 1 and cover the first heat exchange tube 12 in the hot molding sand; start the first oil pump 212 of the storage unit 2 to send the cold heat-conducting oil in the main partition chamber of the cold liquid tank 211 into the first heat exchange tube 12 of the heat absorption unit 1 to exchange heat and cool down the hot molding sand in the hopper 11; the hot heat-conducting oil after heat exchange flows back to the hot liquid tank 221 for heat preservation storage; load the material to be heated, such as a casting mold or a wet iron block, into the storage box 31 of the recycling unit 3 with the material frame 33, and start the second oil pump 222 of the storage unit 2 to send the hot heat-conducting oil in the hot liquid tank 221 into the second heat exchange tube 32 of the recycling unit 3 to heat the material in the material frame 33 by using heat radiation. At this time, the heat-conducting oil in the second heat exchange tube 32 will cool down after heat exchange, and the cooled heat-conducting oil will flow back to the auxiliary partition chamber of the cold liquid tank 211 for temporary storage. During the temporary storage process, a small amount of remaining heat in the heat-conducting oil will be naturally released; when the height of the heat-conducting oil flowing back to the auxiliary partition chamber exceeds the height of the partition in the middle of the cold liquid tank 211, it will overflow into the main partition chamber for storage and recycling.

[0032] If the temperature sensor 225 in the hot liquid tank 221 detects that the temperature of the heat-conducting oil in the hot liquid tank 221 is lower than the set minimum temperature, the drain valve 224 at the bottom of the hot liquid tank 221 can be opened to discharge the heat-conducting oil in the hot liquid tank 221 into the cold liquid tank 211.

[0033] By improving the casting waste heat recycling device, the present utility model integrates the storage unit 2 that can store and supply cold and hot heat-conducting oil, the heat absorption unit 1 provided with the first heat exchange tube 12, and the recycling unit 3 provided with the second heat exchange tube 32. The heat-conducting oil with high heat exchange efficiency circulates between the first heat exchange tube 12, the storage unit 2, and the second heat exchange tube 32 for heat and cold exchange, so as to exchange heat and cool down the hot molding sand in the heat absorption unit 1, store heat by the storage unit 2, and heat the material in the recycling unit 3, thereby recycling the casting waste heat and improving the heat exchange efficiency and reducing the impact on the environment.

[0034] The above is only a specific embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantive modification made to the present utility model using this concept shall fall within the scope of infringement of the protection scope of the present utility model.

Claims

1. A casting waste heat recovery device, comprising a bracket (4), characterized in that: It further includes a heat absorption unit (1), a storage unit (2), and a reuse unit (3). The heat absorption unit (1) is provided with a sand hopper and a heat exchange tube placed inside the sand hopper. The sand hopper can hold the hot mold sand after casting. The reuse unit (3) is provided with a container box and a heat exchange tube placed on the inner wall of the container box. The container box can hold the material to be heated. Heat-conducting oil can flow through the heat exchange tubes provided in the heat absorption unit (1) and the reuse unit (3). The storage unit (2) is provided with an oil tank that can separately hold cold and hot heat-conducting oil. The storage unit (2) can send the stored cold heat-conducting oil into the heat exchange tube of the heat absorption unit (1) to exchange heat and cool down the hot mold sand in the heat absorption unit (1), and can send the hot heat-conducting oil that flows back to the storage unit (2) after heat exchange into the heat exchange tube of the reuse unit (3) to heat the material in the reuse unit (3). The heat absorption unit (1), the storage unit (2), and the reuse unit (3) are all fixedly connected to the bracket (4).

2. The waste heat recovery device for casting according to claim 1, characterized in that: The heat absorption unit (1) includes a hopper (11), a first heat exchange tube (12), and a discharge valve (13). The hopper (11) is a cavity body with a conical lower part and an open top, and a discharge port is provided at its bottom. The first heat exchange tube (12) is placed in the cavity of the hopper (11). The discharge valve (13) is connected to the discharge port at the bottom of the hopper (11).

3. The casting waste heat recovery device according to claim 2, characterized in that: The first heat exchange tube (12) is a heat-conducting member formed by connecting several groups of parallel and vertically arranged serpentine heat transfer oil pipes, and its inlet end is lower than its outlet end.

4. A casting waste heat recovery device according to claim 3, characterized in that: The reuse unit (3) includes a storage box (31), a second heat exchange tube (32), and a material frame (33). The second heat exchange tube (32) is fixedly connected to the inner side wall of the storage box (31). The material frame (33) is a heat-transferable hollow frame body and is placed in the middle of the storage box (31).

5. A casting waste heat recovery device according to claim 4, characterized in that: The storage box (31) is a box-shaped cavity body with a box cover on the top, and heat insulation layers are provided on its box wall and box cover. The second heat exchange tube (32) is a heat-conducting member prepared by forming a heat transfer oil pipe into a spiral shape, and its inlet end is lower than its outlet end.

6. A casting waste heat recovery device according to claim 5, characterized in that: The storage unit (2) includes a cold liquid storage component (21) and a hot liquid storage component (22). The hot liquid storage component (22) is detachably connected above the cold liquid storage component (21).

7. A casting waste heat recovery device according to claim 6, characterized in that: The cold liquid storage component (21) includes a cold liquid box (211), a first oil pump (212), and a first one-way valve (213). The cold liquid box (211) is a box-shaped cavity body with an open top. A partition with a height lower than the side wall of the box body is provided in the middle. The partition divides the cavity of the cold liquid box (211) into a main partition cavity and a secondary partition cavity. The first oil pump (212) is placed in the main partition cavity of the cold liquid box (211). The first oil pump (212) is connected to the inlet end of the first heat exchange tube (12) by an oil pipe. The first one-way valve (213) is connected to the oil pipe communicating with the inlet end of the first heat exchange tube (12). The outlet end of the second heat exchange tube (32) is connected to the secondary partition cavity of the cold liquid box (211) by an oil pipe.

8. A casting waste heat recovery device according to claim 7, characterized in that: The described hot liquid storage assembly (22) includes a hot liquid tank (221), a second oil pump (222), a second one-way valve (223), and a drain valve (224). The hot liquid tank (221) is a box-shaped cavity with a lid on the top, and heat insulation layers are provided on both its box walls and the lid. The second oil pump (222) is placed inside the hot liquid tank (221), and the second oil pump (222) is connected to the inlet end of the second heat exchange tube (32) by an oil pipe. The second one-way valve (223) is connected to the oil pipe communicating with the inlet end of the second heat exchange tube (32). The outlet end of the first heat exchange tube (12) is connected to the hot liquid tank (221) by an oil pipe. A drain port is provided at the bottom of the hot liquid tank (221), and the drain port is located above the secondary partition cavity of the cold liquid tank (211). The drain valve (224) is connected to this drain port.

9. The casting waste heat recovery device according to claim 8, wherein: The described hot liquid storage assembly (22) further includes a temperature sensor (225), and the temperature sensor (225) is placed inside the hot liquid tank (221).

10. A casting waste heat recovery device according to claim 9, characterized in that: Level sensors (201) are provided both inside the cold liquid tank (211) of the cold liquid storage assembly (21) and inside the hot liquid tank (221) of the hot liquid storage assembly (22).

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