Casting waste heat recovery device

Abstract

The utility model relates to the technical field of waste heat recovery, in particular to a casting waste heat recovery device which comprises a heat exchange box which is independently and fixedly arranged, an air inlet mechanism is arranged at the bottom end of the heat exchange box, and an air outlet mechanism is arranged at the top end of the heat exchange box. The supporting frame is installed in the inner cavity of the heat exchange box, a plurality of heat exchange pipes are installed on the supporting frame, the air inlet ends of the heat exchange pipes are connected with the air inlet mechanism, and the air outlet ends of the heat exchange pipes are connected with the air outlet mechanism; the adapter pipe group is rotatably mounted on the heat exchange box and consists of a plurality of water dispersion pipes which are mounted at equal intervals, a plurality of spray heads are arranged on the water dispersion pipes at equal intervals, and the plurality of spray heads on the water dispersion pipes correspond to the plurality of heat exchange pipes in a one-to-one manner; the switching mechanism is mounted on the heat exchange box, and the switching mechanism is connected with the switching pipe set and the heat exchange water source; the driving mechanism is mounted on the heat exchange box, is connected with the plurality of water dispersing pipes and is used for driving the spray heads to swing by the water dispersing pipes, so that water is sprayed to the heat exchange pipes for waste heat recovery; the heat exchange efficiency is improved, and the energy utilization rate is increased.

Description

Technical Field

[0001] This utility model relates to the technical field of waste heat recovery, and in particular to a waste heat recovery device for casting. Background Technology

[0002] The casting industry is a crucial component of industrial production, widely applied in machinery manufacturing, automotive, aerospace, and other fields. During the casting process, the cooling and shaping of molten metal generates a large amount of high-temperature waste gas, which is typically released directly into the atmosphere, resulting in energy waste and environmental pollution. Statistics show that waste heat generated during casting accounts for over 30% of total production energy consumption. Therefore, how to efficiently recover and utilize this waste heat has become a key issue for energy conservation and emission reduction in the casting industry.

[0003] Traditional waste heat recovery devices for casting typically employ an immersion heat exchange method, where the heat exchange tubes are completely submerged in cooling water. High-temperature waste gas transfers heat to the cooling water as it passes through the tubes. While this method is simple and easy to implement, it suffers from several drawbacks. After the high-temperature waste gas enters the heat exchange tubes through the inlet, its temperature gradually decreases with heat transfer. However, even when the waste gas temperature drops to near the cooling water temperature, it remains in contact with the cooling water, leading to a significant decrease in heat exchange efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a casting waste heat recovery device that improves heat exchange efficiency and increases energy utilization.

[0005] The casting waste heat recovery device of this utility model includes:

[0006] The heat exchange box is independently and fixedly installed. An air inlet mechanism is installed at the bottom of the heat exchange box, and an air outlet mechanism is installed at the top.

[0007] A support frame is installed inside the heat exchange box, and multiple heat exchange tubes are installed on the support frame. The air inlet end of the multiple heat exchange tubes is connected to the air inlet mechanism, and the air outlet end is connected to the air outlet mechanism.

[0008] The transfer pipe assembly is rotatably installed on the heat exchange box. The transfer pipe assembly consists of multiple equally spaced water distribution pipes, and multiple nozzles are equally spaced on the water distribution pipes. Each nozzle on the water distribution pipe corresponds to one of the multiple heat exchange pipes.

[0009] The transfer mechanism is installed on the heat exchange box and is connected to the transfer pipe assembly and the heat exchange water source respectively;

[0010] The drive mechanism is installed on the heat exchange box and is connected to multiple water distribution pipes. The water distribution pipes drive the nozzles to swing, so that water is sprayed onto the heat exchange tubes for waste heat recovery.

[0011] Furthermore, the drive mechanism includes:

[0012] The mounting bracket is installed on the heat exchange box, and the mounting bracket is provided with a positioning inner groove, which is perpendicular to the rotation axis of the water distribution pipe.

[0013] A straight rack is installed in the positioning groove and slides along the length of the positioning groove.

[0014] The transmission gears are coaxially mounted on the water distribution pipes, and each water distribution pipe is equipped with a transmission gear. Multiple transmission gears are meshed with a spur rack.

[0015] The power mechanism, mounted on the mounting bracket, is used to provide reciprocating oscillating force to the rack.

[0016] As a preferred embodiment, the power mechanism includes:

[0017] The drive motor is mounted on a mounting bracket, and an eccentric wheel is installed at the output end of the drive motor;

[0018] The transmission component is mounted on the rack through the through slot of the mounting bracket, and the eccentric wheel is slidably mounted in the inner slot of the transmission component.

[0019] Furthermore, the mounting bracket is equipped with an isolating component, and the transmission component is located inside the isolating component.

[0020] As a preferred option, the switching mechanism includes:

[0021] The support base is installed on the heat exchange box, and multiple connecting pipes are provided on the support base, with each connecting pipe corresponding to a water distribution pipe.

[0022] The transmission pipe is coaxially fixedly installed on the connecting pipe, and the transmission pipe and the water distribution pipe are coaxially rotatably installed.

[0023] Furthermore, the air intake mechanism includes:

[0024] The mounting base is installed at the air inlet at the bottom of the heat exchange box, and the air inlet ends of multiple heat exchange tubes are connected to the mounting base.

[0025] The air diffuser is installed on the mounting base and is connected to the air inlet of multiple heat exchange tubes.

[0026] Preferably, the air outlet mechanism includes:

[0027] A fixed base is installed at the air outlet at the top of the heat exchange box, and the air outlet ends of multiple heat exchange tubes are connected to the fixed base.

[0028] The guide component is installed on the fixed base and is connected to the outlet end of multiple heat exchange tubes.

[0029] Furthermore, a water outlet pipe is installed in the middle of the heat exchange box to drain water that exceeds the preset water level inside the heat exchange box;

[0030] A drain valve is installed at the bottom of the heat exchange box to drain water from the bottom of the heat exchange box.

[0031] A waste heat recovery device for casting is designed as follows: An independently fixed heat exchange box provides a stable working environment for the entire waste heat recovery process. Its bottom air inlet mechanism and top air outlet mechanism ensure smooth introduction of high-temperature waste gas and efficient discharge of waste gas after heat exchange, respectively. A support frame installed inside the heat exchange box evenly distributes multiple heat exchange tubes, greatly increasing the contact area between the heat exchange tubes and cooling water, significantly improving heat exchange efficiency. A rotating transfer pipe assembly installed on the heat exchange box, consisting of multiple equally spaced water distribution pipes and corresponding nozzles, can evenly spray cooling water onto the surface of the heat exchange tubes, ensuring the comprehensiveness and efficiency of the waste heat recovery process. The transfer mechanism precisely delivers cooling water from the water source to the water distribution pipes, providing sufficient cooling medium for waste heat recovery. The drive mechanism connects to the water distribution pipes, causing the nozzles to swing, allowing cooling water to be sprayed onto the heat exchange tubes from all directions and multiple angles, further enhancing the waste heat recovery effect. This comprehensively realizes the efficient recovery and utilization of casting waste heat, reducing energy consumption and improving the energy utilization rate of casting production. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the casting waste heat recovery device in this utility model at the first angle;

[0033] Figure 2 This is a schematic diagram of the casting waste heat recovery device in this utility model at the second angle;

[0034] Figure 3 This is a schematic diagram of the casting waste heat recovery device in this utility model from a third angle;

[0035] Figure 4 This is a cross-sectional view of the heat exchange box of the casting waste heat recovery device in this utility model;

[0036] Figure 5 This is a schematic diagram of the internal structure of the heat exchange box of the casting waste heat recovery device in this utility model;

[0037] Figure 6 This utility model relates to a waste heat recovery device for casting. Figure 5 Enlarged structural diagram of section A in the middle;

[0038] The following are labels in the attached diagram: 1. Heat exchanger box; 11. Air inlet mechanism; 11a. Mounting base; 11b. Air diffuser; 12. Air outlet mechanism; 12a. Fixed base; 12b. Guide component; 2. Support frame; 3. Heat exchange tube; 4. Transfer pipe assembly; 41. Water distribution pipe; 42. Nozzle; 5. Transfer mechanism; 51. Support base; 52. Connecting pipe; 53. Transmission pipe; 6. Drive mechanism; 61. Mounting frame; 62. Spur rack; 63. Transmission gear; 64. Power mechanism; 64a. Drive motor; 64b. Eccentric wheel; 64c. Transmission component; 64d. Isolation component. Detailed Implementation

[0039] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0040] This utility model relates to a waste heat recovery device for casting, such as Figures 1 to 6 As shown, it includes:

[0041] Heat exchange box 1 is independently and fixedly set. The bottom of heat exchange box 1 is equipped with an air inlet mechanism 11 for introducing high-temperature exhaust gas, and the top is equipped with an air outlet mechanism 12 for discharging the exhaust gas after heat exchange.

[0042] The support frame 2 is installed in the inner cavity of the heat exchange box 1, and multiple heat exchange tubes 3 are installed on the support frame 2. The air inlet end of the multiple heat exchange tubes 3 is connected to the air inlet mechanism 11, and the air outlet end is connected to the air outlet mechanism 12. The design of the support frame 2 ensures that the heat exchange tubes 3 are evenly distributed in the heat exchange box 1 to improve the heat exchange efficiency.

[0043] The transfer pipe assembly 4 is rotatably installed on the heat exchange box 1. The transfer pipe assembly 4 consists of multiple equally spaced water distribution pipes 41, and multiple nozzles 42 are equally spaced on the water distribution pipes 41. The multiple nozzles 42 on the water distribution pipes 41 correspond one-to-one with the multiple heat exchange tubes 3, and are used to evenly spray cooling water onto the surface of the heat exchange tubes 3 for waste heat recovery.

[0044] The transfer mechanism 5 is installed on the heat exchange box 1. The transfer mechanism 5 is connected to the transfer pipe group 4 and the heat exchange water source respectively. The transfer mechanism 5 is used to transport cooling water from the water source to the water distribution pipe 41 and spray it onto the surface of the heat exchange pipe 3 through the nozzle 42.

[0045] The drive mechanism 6 is installed on the heat exchange box 1. The drive mechanism 6 is connected to multiple water distribution pipes 41. The water distribution pipes 41 drive the nozzles 42 to swing, so that water is sprayed onto the heat exchange tubes 3 for waste heat recovery.

[0046] The working principle of this device is as follows:

[0047] High-temperature exhaust gas generated during the casting process flows into the heat exchange tube 3 through the air inlet mechanism 11. The high-temperature exhaust gas flows inside the heat exchange tube 3, transferring its heat to the tube wall. The transfer mechanism 5 delivers cooling water from the water source to the water distribution pipe 41 of the transfer pipe assembly 4. The drive mechanism 6 drives the water distribution pipe 41 to swing, so that the nozzle 42 sprays the cooling water evenly onto the surface of the heat exchange tube 3. The cooling water contacts the high-temperature surface of the heat exchange tube 3, absorbs heat, and realizes waste heat recovery. When the high-temperature exhaust gas flows inside the heat exchange tube 3, its heat is transferred to the cooling water through the tube wall. After heat exchange, the low-temperature exhaust gas is discharged from the heat exchange tube 3 through the air outlet mechanism 12 and enters the subsequent processing process.

[0048] The independently fixed heat exchange box 1 provides a stable working environment for the entire waste heat recovery process. The air inlet mechanism 11 at the bottom and the air outlet mechanism 12 at the top enable the smooth introduction of high-temperature waste gas and the efficient discharge of waste gas after heat exchange, respectively. The support frame 2 installed in the inner cavity of the heat exchange box 1 ensures that multiple heat exchange tubes 3 are evenly distributed, greatly increasing the contact area between the heat exchange tubes 3 and the cooling water, and significantly improving the heat exchange efficiency. The rotating transfer pipe assembly 4 installed on the heat exchange box 1 consists of multiple equally spaced water distribution pipes 41 and corresponding nozzles 42, which can evenly spray cooling water onto the surface of the heat exchange tubes 3, ensuring the comprehensiveness and efficiency of the waste heat recovery process. The transfer mechanism 5 accurately delivers cooling water from the water source to the water distribution pipes 41, providing sufficient cooling medium for waste heat recovery. The drive mechanism 6 is connected to the water distribution pipes 41 and drives the nozzles 42 to swing, so that the cooling water can be sprayed onto the heat exchange tubes 3 from all directions and multiple angles, further improving the waste heat recovery effect. This comprehensively realizes the efficient recovery and utilization of casting waste heat, reduces energy consumption, and improves the energy utilization rate of casting production.

[0049] As a preferred option, such as Figures 1 to 6 As shown, the drive mechanism 6 includes:

[0050] Mounting bracket 61 is installed on heat exchange box 1, and mounting bracket 61 is provided with positioning inner groove, which is perpendicular to the rotation axis of water distribution pipe 41.

[0051] A straight rack 62 is installed in the positioning groove and slides along the length of the positioning groove;

[0052] The transmission gear 63 is coaxially mounted on the water distribution pipe 41, and each water distribution pipe 41 is equipped with a transmission gear 63. Multiple transmission gears 63 are meshed with a rack 62.

[0053] The power mechanism 64 is mounted on the mounting bracket 61 and is used to provide reciprocating oscillating force to the rack 62.

[0054] The mounting bracket 61, installed on the heat exchange box 1, provides stable support for the entire drive structure. Its positioning groove is perpendicular to the rotation axis of the water distribution pipe 41, precisely limiting the sliding direction of the rack 62 and ensuring stable power transmission. The rack 62 slides along its length in the positioning groove and meshes with the transmission gears 63 coaxially mounted on each water distribution pipe 41, forming an efficient transmission system. The power mechanism 64 is installed on the mounting bracket 61 and provides reciprocating oscillation force to the rack 62. Through the linear reciprocating motion of the rack 62, it drives the multiple transmission gears 63 meshing with it to rotate alternately in the forward and reverse directions, thereby realizing that the water distribution pipe 41 drives the nozzle 42 to oscillate regularly. This design allows the cooling water to be sprayed evenly and at multiple angles onto the surface of the heat exchange pipe 3, fully covering the heat exchange pipe 3, greatly improving the uniformity and efficiency of waste heat recovery, and comprehensively ensuring the efficient and stable operation of the casting waste heat recovery device, meeting the casting industry's demand for precise and efficient operation of waste heat recovery equipment.

[0055] As a preferred option, such as Figures 1 to 6 As shown, the power mechanism 64 includes:

[0056] A drive motor 64a is mounted on a mounting bracket 61, and an eccentric wheel 64b is mounted on the output end of the drive motor 64a.

[0057] The transmission component 64c is mounted on the rack 62 through the through slot of the mounting bracket 61, and the eccentric wheel 64b is slidably mounted in the inner slot of the transmission component 64c.

[0058] The mounting bracket 61 is provided with an isolator 64d, and the transmission component 64c is located in the inner cavity of the isolator 64d;

[0059] The drive motor 64a, mounted on the mounting bracket 61, provides a stable power source for the entire power output. The eccentric wheel 64b mounted on its output end works ingeniously with the transmission component 64c, which passes through the through slot of the mounting bracket 61 and is mounted on the rack 62. When the drive motor 64a runs, the eccentric wheel 64b rotates accordingly. Due to its eccentric characteristics, it slides in the inner groove of the transmission component 64c, converting the rotational motion into the linear reciprocating motion of the rack 62 driven by the transmission component 64c. This provides a stable reciprocating oscillating force to the rack 62 precisely and efficiently. The isolation component 64d set on the mounting bracket 61 places the transmission component 64c in its inner cavity, effectively isolating the transmission component 64c from external dust, debris, and other contaminants, preventing problems such as jamming and wear caused by foreign objects entering, ensuring that the transmission component 64c works in a stable environment, and extending its service life.

[0060] As a preferred option, such as Figures 1 to 6 As shown, the adapter 5 includes:

[0061] The support base 51 is installed on the heat exchange box 1, and multiple connecting pipes 52 are provided on the support base 51, and the connecting pipes 52 correspond one-to-one with the water distribution pipes 41.

[0062] The transmission pipe 53 is coaxially fixedly installed on the connecting pipe 52, and the transmission pipe 53 and the water distribution pipe 41 are coaxially rotatably installed.

[0063] The support base 51 installed on the heat exchange box 1 provides a stable installation foundation for the entire transfer structure. Multiple connecting pipes 52 installed on it correspond one-to-one with the water distribution pipe 41, realizing precise planning of the cooling water delivery path. The transmission pipe 53 is coaxially fixedly installed on the connecting pipe 52 and coaxially rotated with the water distribution pipe 41. This design allows the cooling water to flow smoothly from the connecting pipe 52 through the transmission pipe 53 into the water distribution pipe 41. At the same time, when the water distribution pipe 41 swings under the drive mechanism 6, the transmission pipe 53 can rotate synchronously with it, ensuring that the delivery of cooling water is not affected by the swing of the water distribution pipe 41, and continuously and stably delivers cooling water from the water source to the water distribution pipe 41, providing a stable and sufficient cooling medium for waste heat recovery, and effectively ensuring the efficient and continuous operation of the waste heat recovery process.

[0064] As a preferred option, such as Figures 1 to 4 As shown, the intake mechanism 11 includes:

[0065] Mounting base 11a is installed at the air inlet at the bottom of heat exchange box 1, and the air inlet ends of multiple heat exchange tubes 3 are connected to mounting base 11a.

[0066] The air diffuser 11b is installed on the mounting base 11a and is connected to the air inlet of multiple heat exchange tubes 3.

[0067] The mounting base 11a, installed at the bottom air inlet of the heat exchange box 1, provides a stable mounting position for the entire air inlet structure. The air inlets of multiple heat exchange tubes 3 are connected to the mounting base 11a, realizing the precise connection of the high-temperature exhaust gas transport path and ensuring that the exhaust gas can smoothly enter the heat exchange tubes 3. The air diffuser 11b installed on the mounting base 11a is connected to the air inlets of multiple heat exchange tubes 3, which can disperse the incoming high-temperature exhaust gas into each heat exchange tube 3, avoiding uneven heat exchange caused by the exhaust gas flowing into some heat exchange tubes in a concentrated manner. This allows the high-temperature exhaust gas to fully contact the heat exchange tubes 3, comprehensively improving the heat exchange efficiency and thus improving the overall efficiency of casting waste heat recovery.

[0068] As a preferred option, such as Figures 1 to 4 As shown, the air outlet mechanism 12 includes:

[0069] The mounting base 12a is installed at the air outlet at the top of the heat exchange box 1, and the air outlets of multiple heat exchange tubes 3 are connected to the mounting base 12a.

[0070] Guide component 12b is installed on the fixed base 12a and is connected to the outlet end of multiple heat exchange tubes 3.

[0071] The mounting base 12a, installed at the air outlet at the top of the heat exchange box 1, provides a stable installation foundation for the entire air outlet structure. The air outlets of multiple heat exchange tubes 3 are connected to the mounting base 12a, realizing the precise docking of the exhaust gas transport path after heat exchange, ensuring that the exhaust gas can be smoothly discharged from the heat exchange tubes 3. The guide 12b installed on the mounting base 12a is connected to the air outlets of multiple heat exchange tubes 3, which can concentrate and guide the low-temperature exhaust gas from each heat exchange tube 3, so that it is discharged in an orderly manner, avoiding the exhaust gas from being disordered and accumulating at the outlet, which would affect the operating efficiency of the device.

[0072] As a preferred option, such as Figures 1 to 4 As shown, a water outlet pipe 7 is installed in the middle of the heat exchange box 1 to discharge water that exceeds the preset water level in the heat exchange box 1.

[0073] A drain valve 8 is provided at the bottom of the heat exchange box 1. The drain valve 8 is used to drain water from the bottom of the heat exchange box 1.

[0074] The water outlet pipe 7 can automatically discharge excess water when the water level in the heat exchange box 1 exceeds the preset value, effectively preventing the normal operation of the equipment from being affected by excessively high water levels, avoiding possible water overflow that could damage surrounding components or cause safety hazards. The drain valve 8 located at the bottom of the heat exchange box 1 facilitates the controlled discharge of water after heat exchange.

[0075] The casting waste heat recovery device of this utility model can be installed, connected or set up in a common mechanical way, and can be implemented as long as it can achieve its beneficial effect.

[0076] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A casting waste heat recovery device characterized by comprising: Include: Heat exchange box (1), independent fixed setting, the bottom end of the heat exchange box (1) is provided with air inlet mechanism (11), the top is provided with air outlet mechanism (12); Support frame (2) is installed in the inner cavity of the heat exchange box (1), and a plurality of heat exchange pipes (3) are installed on the support frame (2), and the air inlet end of the plurality of heat exchange pipes (3) is connected with the air inlet mechanism (11), and the air outlet end is connected with the air outlet mechanism (12); Adapter pipe group (4) is rotatably installed on the heat exchange box (1), the adapter pipe group (4) is composed of a plurality of equidistantly installed water distribution pipes (41), and a plurality of nozzles (42) are equidistantly arranged on the water distribution pipe (41), and the plurality of nozzles (42) on the water distribution pipe (41) correspond to the plurality of heat exchange pipes (3) one by one; Adapter mechanism (5) is installed on the heat exchange box (1), the adapter mechanism (5) is connected with the adapter pipe group (4) and the heat exchange water source respectively; Driving mechanism (6) is installed on the heat exchange box (1), the driving mechanism (6) is connected with a plurality of water distribution pipes (41), for driving the nozzle (42) to swing, so that water is sprayed on the heat exchange pipe (3) to recover waste heat.

2. The waste heat recovery device for casting according to claim 1, wherein The driving mechanism (6) comprises: Mounting bracket (61) is installed on the heat exchange box (1), and the mounting bracket (61) is provided with a positioning inner groove, and the positioning inner groove is vertically arranged with the rotating shaft of the water distribution pipe (41); Straight rack (62) is installed in the positioning inner groove, and is slidably installed along the length direction of the positioning inner groove; Transmission gear (63) is coaxially installed on the water distribution pipe (41), and the transmission gear (63) is installed on each water distribution pipe (41), and a plurality of transmission gears (63) are meshed with the straight rack (62); Power mechanism (64) is installed on the mounting bracket (61), and the power mechanism (64) is used for providing reciprocating swing force to the straight rack (62).

3. The waste heat recovery device for casting according to claim 2, wherein The power mechanism (64) comprises: Driving motor (64a) is installed on the mounting bracket (61), and the output end of the driving motor (64a) is provided with an eccentric wheel (64b); Transmission member (64c) is installed on the straight rack (62) through the through slot of the mounting bracket (61), and the eccentric wheel (64b) is slidably installed in the inner groove of the transmission member (64c).

4. The waste heat recovery device for casting according to claim 3, wherein The mounting bracket (61) is provided with a spacer (64d), and the transmission member (64c) is located in the inner cavity of the spacer (64d).

5. The waste heat recovery device for casting according to claim 1, wherein The adapter mechanism (5) comprises: Support seat (51) is installed on the heat exchange box (1), and a plurality of connecting pipes (52) are arranged on the support seat (51), and the connecting pipes (52) correspond to the water distribution pipes (41) one by one; Transmission pipe (53) is coaxially fixedly installed on the connecting pipe (52), and the transmission pipe (53) is coaxially rotatably installed with the water distribution pipe (41).

6. The waste heat recovery device for casting according to claim 1, wherein The air inlet mechanism (11) comprises: A mounting seat (11a) is mounted at the air inlet at the bottom end of the heat exchange box (1), and the air inlet ends of the plurality of heat exchange pipes (3) are connected to the mounting seat (11a) in a matching mode; An air diffuser (11b) is mounted on the mounting seat (11a), and the air diffuser (11b) is communicated with the air inlet ends of the plurality of heat exchange pipes (3).

7. The waste heat recovery device for casting according to claim 1, wherein The air outlet mechanism (12) comprises: A fixing seat (12a) is mounted at the air outlet at the top end of the heat exchange box (1), and the air outlet ends of the plurality of heat exchange pipes (3) are connected to the fixing seat (12a) in a matching mode; A guide member (12b) is mounted on the fixing seat (12a), and the guide member (12b) is communicated with the air outlet ends of the plurality of heat exchange pipes (3).

8. The waste heat recovery device for casting according to claim 1, wherein A water outlet pipe (7) is mounted in the middle of the heat exchange box (1) for discharging water in the heat exchange box (1) exceeding a preset water level; A drain valve (8) is arranged at the bottom end of the heat exchange box (1), and the drain valve (8) is used for discharging water at the bottom end of the heat exchange box (1).

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