Three-medium heat exchanger with auxiliary heat exchange structure

Abstract

The invention discloses a three-medium heat exchanger with an auxiliary heat exchange structure, and relates to the technical field of heat exchangers. The heat exchanger comprises a base, and a first liquid collecting tank and a second liquid collecting tank are arranged on the left side and the right side of the top of the base respectively; the heat exchange module comprises a first flow channel and a second flow channel, the first flow channel is of a cylindrical structure formed by a spiral pipe, the second flow channel is a closed space formed by wrapping gaps of the spiral pipe with an outer spiral plate and an inner spiral plate, and outer fins are arranged on the outer surface of the first flow channel and the outer surface of the second flow channel. The surfaces of the outer fins are fixedly connected with connecting cylinders, auxiliary flow channels are further arranged in the first flow channel and the second flow channel, and inner fins are arranged on the surfaces of the auxiliary flow channels. A controller is further arranged on the top of the base. According to the three-medium heat exchanger with the auxiliary heat exchange structure, the problems that a traditional three-medium heat exchanger is low in heat exchange efficiency and cannot be dynamically adjusted are solved, and the efficient and flexible heat exchange function is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a three-medium heat exchanger with an auxiliary heat exchange structure. Background Art

[0002] Heat exchangers are very common equipment and are widely used in various fields of our lives and industries. For example, heat exchangers play an important role in air conditioners, refrigerators, automobile engine cooling systems, and even boilers and chemical reactors in factories. Its main function is to transfer heat from one medium to another, thereby achieving the purpose of heating, cooling or energy recovery.

[0003] With the continuous advancement of industrial technology, more and more scenarios need to deal with the heat exchange problems of multiple media at the same time. For example, in chemical production, it may be necessary to cool two different liquids at the same time, and use air to recover waste heat; in new energy vehicles, efficient heat exchange is also required between battery coolant, air conditioning refrigerant and cabin air. This demand has given rise to the emergence of three-medium heat exchangers. Three-medium heat exchangers can handle three different media (usually two liquids and one gas) at the same time, allowing heat exchange between them to meet complex working conditions.

[0004] Existing three-medium heat exchangers mostly adopt a fixed structure. For example, a three-medium heat exchanger is disclosed in publication number CN113606961A. An auxiliary heat exchange structure is formed by tightly fitting a composite tube group, and an auxiliary single tube is added to expand the heat exchange area of ​​the third medium. However, the flow distribution between the auxiliary single tube and the second medium tube is difficult to balance, and the heat exchange path cannot be dynamically adjusted according to temperature changes. For example, when the temperature of a certain medium is too high or too low, the heat exchanger cannot automatically switch the flow channel to enhance the heat exchange, resulting in insufficient heat exchange under some working conditions. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a three-medium heat exchanger with an auxiliary heat exchange structure, which solves the problems of low heat exchange efficiency and inability to dynamically adjust of traditional three-medium heat exchangers, and realizes efficient and flexible heat exchange functions.

[0006] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: A three-medium heat exchanger with an auxiliary heat exchange structure, comprising: A base, wherein a first liquid collecting tank and a second liquid collecting tank are respectively arranged on the left and right sides of the top of the base, wherein the first liquid collecting tank comprises a first lower tank and a first upper tank, and the second liquid collecting tank comprises a second lower tank and a second upper tank; A heat exchange module, the heat exchange module is fixedly installed on the top of the base and is located between the first liquid collecting tank and the second liquid collecting tank, the heat exchange module includes a flow channel 1 and a flow channel 2, the flow channel 1 is a cylindrical structure composed of a spiral tube, the flow channel 2 is a closed space formed by the gap between the spiral tube wrapped by an outer spiral plate and an inner spiral plate, the outer surfaces of the flow channel 1 and the flow channel 2 are provided with external fins, the surfaces of the external fins are fixedly connected with a connecting cylinder, the insides of the flow channel 1 and the flow channel 2 are also provided with auxiliary flow channels, and the surfaces of the auxiliary flow channels are provided with inner fins; The inlet end of the auxiliary flow channel is connected with lower tank one and lower tank two through a first connecting pipe, and the outlet end of the auxiliary flow channel is connected with upper tank one and upper tank two through a second connecting pipe. A first valve and a second valve are respectively arranged on the surface of the first connecting pipe near both ends, and a third valve and a fourth valve are respectively arranged on the surface of the second connecting pipe near both ends. A temperature sensor one is arranged on the surface of the upper tank one, and a temperature sensor two is arranged on the surface of the upper tank two. A controller is also arranged on the top of the base. The controller controls the opening and closing of the first to fourth valves according to the signals of the temperature sensor one and the temperature sensor two to switch the flow direction of the medium in the auxiliary flow channel.

[0007] Preferably, a surface of one side of the outer spiral plate and the inner spiral plate is provided with a protruding structure, the protruding structure is in a continuous wave shape, and the height difference between the wave crest and the wave trough of the protruding structure is 1-3 mm.

[0008] Preferably, the two ends of the flow channel one are respectively connected to a flow channel one inlet pipe and a flow channel one outlet pipe, one end of the flow channel one inlet pipe and the flow channel one outlet pipe extend to the outside of the connecting cylinder, the top of the flow channel two is vertically connected to the flow channel two outlet pipe, the bottom of the flow channel two is provided with a flow channel two inlet pipe directly below the flow channel two outlet pipe, the top of the auxiliary flow channel is vertically connected to the auxiliary flow channel outlet pipe, and the bottom of the auxiliary flow channel is provided with an auxiliary flow channel inlet pipe directly below the auxiliary flow channel outlet pipe.

[0009] Preferably, a connecting pipe 1 is connected between one end of the outlet pipe of the flow channel 1 and the upper tank 2, a connecting pipe 2 is connected between one end of the inlet pipe of the flow channel 1 and the lower tank 2, a connecting pipe 3 is connected between one end of the outlet pipe of the flow channel 2 and the upper tank 1, a connecting pipe 4 is connected between one end of the inlet pipe of the flow channel 2 and the lower tank 1, and the surface of the second connecting pipe near the third valve and the fourth valve are respectively connected with the first cleaning pipe and the second cleaning pipe, the surface of the first cleaning pipe is provided with a fifth valve, and the surface of the second cleaning pipe is provided with a sixth valve.

[0010] Preferably, the heat exchange modules are provided in plurality, and the plurality of heat exchange modules are arranged in sequence along the axial direction of the connecting cylinder, a connecting pipe five is connected between one end of the channel one outlet pipe and one end of the channel one inlet pipe on the adjacent heat exchange module, one end of the channel two outlet pipe is connected to the channel two inlet pipe on the adjacent heat exchange module, and one end of the auxiliary channel outlet pipe is connected to the auxiliary channel inlet pipe on the adjacent heat exchange module.

[0011] Preferably, the first valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve are all solenoid valves and are electrically connected to the control end of the controller, and the output ends of the temperature sensor 1 and the temperature sensor 2 are electrically connected to the input end of the controller. When the temperature sensor 1 detects that the temperature of the fluid in the upper tank 1 exceeds the set threshold, or the temperature sensor 2 detects that the temperature of the fluid in the upper tank 2 is lower than the set threshold, it is determined that the corresponding flow channel has insufficient heat exchange; if the flow channel 1 has insufficient heat exchange, the controller opens the first valve and the third valve, and closes the second valve and the fourth valve; if the flow channel 2 has insufficient heat exchange, the controller opens the second valve and the fourth valve, and closes the first valve and the third valve; before switching the medium of the auxiliary flow channel to flow to the upper tank 1 or the upper tank 2, the controller opens the fifth valve or the sixth valve to empty the residual fluid in the auxiliary flow channel through the first cleaning pipe or the second cleaning pipe.

[0012] Preferably, connecting flanges are provided at both ends of the connecting cylinder, two adjacent heat exchange modules are fixedly connected via the connecting flanges, and a connecting ring having the same inner diameter as the connecting cylinder is fixedly connected to the bottom of the base.

[0013] Preferably, ventilation holes are provided on the surfaces of the outer fins and the inner fins.

[0014] Preferably, the surface of the lower tank one is connected to a fluid one inlet pipe, the surface of the upper tank one is connected to a fluid one outlet pipe, the surface of the lower tank two is connected to a fluid two inlet pipe, and the surface of the upper tank two is connected to a fluid two outlet pipe.

[0015] Preferably, the surface of the heat exchange module is provided with a corrosion-resistant coating.

[0016] (III) Beneficial effects The present invention provides a three-medium heat exchanger with an auxiliary heat exchange structure, which has the following beneficial effects: (1) Through the spiral design of flow channel 1 and the arrangement of flow channel 2 in the gap of spiral flow channel 1, heat exchange between the medium in flow channel 1 and the medium in flow channel 2 is achieved. At the same time, both sides of flow channel 1 are also located outside flow channel 2. At the same time, fins are arranged on the inner and outer layers of the cylinder formed by flow channel 2, so that heat exchange between the medium in flow channel 1 and the medium in flow channel 2 and the gas is achieved, thereby achieving heat exchange between the three media.

[0017] (2) The outer spiral plate and the inner spiral plate of the flow channel 2 are provided with a protruding structure on the surface, which increases the inner surface area, enhances the fluid disturbance, and improves the heat exchange efficiency. At the same time, the inner fins and the outer fins are provided to improve the heat exchange efficiency between the gas and the flow channels 1 and 2.

[0018] (3) By setting a spiral auxiliary flow channel in the inner fin and controlling the valve corresponding to the auxiliary flow channel, the flow direction of the medium can be switched and dynamically adjusted according to the heat exchange effect achieved, thereby improving the heat exchange effect. Intelligent control can be achieved through the controller and temperature sensor.

[0019] (4) The main part of the heat exchange system is modularly designed, and the heat exchange modules can be added or removed according to the needs of the site, which expands the scope of application. At the same time, the modular design also reduces the subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention from a first viewing angle; Figure 2 It is a schematic diagram of the overall structure of the present invention from a second viewing angle; Figure 3 It is a schematic diagram of the overall structure of the present invention from a third viewing angle; Figure 4 It is a structural schematic diagram of the heat exchange module of the present invention; Figure 5 is a cross-sectional view of a heat exchange module of the present invention; Figure 6 An exploded view of the heat exchange module of the present invention; Figure 7 It is a schematic diagram of the connection between the spiral tube of the present invention and the outer spiral plate and the inner spiral plate.

[0021] In the figure: 1-base, 101-connecting ring, 2-liquid collecting tank 1, 201-lower tank 1, 202-upper tank 1, 203-fluid 1 inlet pipe, 204-fluid 1 outlet pipe, 205-temperature sensor 1, 3-liquid collecting tank 2, 301-lower tank 2, 302-upper tank 2, 303-fluid 2 inlet pipe, 304-fluid 2 outlet pipe, 305-temperature sensor 2, 4-heat exchange module, 401-flow channel 1, 401a-spiral tube, 402-flow channel 2, 402a-external spiral plate, 402b-inner spiral plate, 403-external fin, 404-inner fin, 405-auxiliary flow channel, 406 -connecting cylinder, 407-inlet pipe of flow channel 1, 408-outlet pipe of flow channel 1, 409-outlet pipe of flow channel 2, 4010-inlet pipe of flow channel 2, 4011-outlet pipe of auxiliary flow channel, 4012-inlet pipe of auxiliary flow channel, 5-first connecting pipe, 501-first valve, 502-second valve, 6-second connecting pipe, 601-third valve, 602-fourth valve, 603-first cleaning pipe, 604-second cleaning pipe, 605-fifth valve, 606-sixth valve, 7-controller, 8-connecting pipe 1, 9-connecting pipe 2, 10-connecting pipe 3, 11-connecting pipe 4, 12-connecting pipe 5. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-7 The present invention provides a technical solution: a three-medium heat exchanger with an auxiliary heat exchange structure, comprising: Base 1, a liquid collecting tank 1 2 and a liquid collecting tank 2 3 are respectively arranged on the left and right sides of the top of the base 1, the liquid collecting tank 1 2 comprises a lower tank 1 201 and an upper tank 1 202, the surface of the lower tank 1 201 is connected with a fluid 1 inlet pipe 203, the surface of the upper tank 1 202 is connected with a fluid 1 outlet pipe 204, the liquid collecting tank 2 3 comprises a lower tank 2 301 and an upper tank 2 302, the surface of the lower tank 2 301 is connected with a fluid 2 inlet pipe 303, the surface of the upper tank 2 302 is connected with a fluid 2 outlet pipe 304; Heat exchange module 4, heat exchange module 4 is fixedly installed on the top of base 1 and is located between liquid collecting tank 1 2 and liquid collecting tank 2 3, heat exchange module 4 includes flow channel 1 401 and flow channel 2 402, flow channel 1 401 is a cylindrical structure composed of spiral tube 401a, the cross-section of spiral tube 401a is circular or rectangular, flow channel 2 402 is a closed space formed by the gap of spiral tube 401a wrapped by outer spiral plate 402a and inner spiral plate 402b, and is fixed to the surface of spiral tube 401a by welding during processing, and the structure composed of flow channel 1 401 and flow channel 2 402 is approximately cylindrical. The outer surfaces of flow channel 1 401 and flow channel 2 402 are provided with external fins 403, and the surface of the external fins 403 is fixedly connected with a connecting cylinder 406, and the setting of the connecting cylinder 406 is convenient for connection with the gas pipeline. Auxiliary flow channels 405 are also provided inside flow channel 1 401 and flow channel 2 402, and the surface of the auxiliary flow channel 405 is provided with internal fins 404, and one side of the internal fins 404 is in contact with and fixed to the inner surfaces of flow channel 1 401 and flow channel 2 402.

[0024] The distance between the outer spiral plate 402a and the inner spiral plate 402b is smaller than the diameter or width of the spiral tube 401a, which ensures that the two sides of the flow channel 401 are located outside, thereby enhancing the heat exchange effect between the inner fin 404 and the outer fin 403. Ventilation holes are provided on the surfaces of the outer fin 403 and the inner fin 404. The ventilation holes cause local disturbances in the gas when flowing through the fins, breaking the laminar boundary layer and significantly improving the heat transfer coefficient. At the same time, the ventilation holes guide the gas to be evenly distributed to avoid local high temperature or low temperature dead zones. In addition, the ventilation holes provide an additional flow path for the gas, reducing the local resistance of the gas when passing through the fins.

[0025] The bottom of the base 1 is fixedly connected with a connecting ring 101 having the same inner diameter as the connecting cylinder 406. A ventilation hole is provided at the bottom of the base 1 and inside the connecting ring 101. The heat exchange module 4 is fixed in the ventilation hole and is conveniently connected to the other end of the gas pipeline through the connecting ring 101.

[0026] The inlet end of the auxiliary flow channel 405 is connected with the lower tank 1 201 and the lower tank 2 301 through the first connecting pipe 5, the first connecting pipe 5 is arranged below the base 1, and the surface of the base 1 and the surface of the connecting ring 101 are provided with through holes adapted to the first connecting pipe 5, the outlet end of the auxiliary flow channel 405 is connected with the upper tank 1 202 and the upper tank 2 302 through the second connecting pipe 6, the top of the auxiliary flow channel 405 is vertically connected with the auxiliary flow channel outlet pipe 4011, and the bottom end of the auxiliary flow channel 405 and located directly below the auxiliary flow channel outlet pipe 4011 is provided with an auxiliary flow channel inlet pipe 4012, specifically, one end of the auxiliary flow channel outlet pipe 4011 and the auxiliary flow channel inlet pipe 4012 is provided with a tee, which is convenient for the connection of the first connecting pipe 5 and the second connecting pipe 6, and the surface of the first connecting pipe 5 and near the two ends are respectively A first valve 501 and a second valve 502 are provided, and a third valve 601 and a fourth valve 602 are respectively provided on the surface of the second connecting pipe 6 and near both ends. The first valve 501 and the third valve 601 are arranged on the side close to the liquid collecting tank 2, a temperature sensor 1 205 is provided on the surface of the upper tank 202, and a temperature sensor 2 305 is provided on the surface of the upper tank 302. A controller 7 is also provided on the top of the base 1. The controller 7 controls the opening and closing of the first to fourth valves according to the signals of the temperature sensor 1 205 and the temperature sensor 2 305 to switch the medium flow direction of the auxiliary flow channel 405. When the fluid heat exchange in the flow channel 1 or the flow channel 2 is insufficient, the corresponding valve is opened to allow the medium of the corresponding flow channel to flow into the auxiliary flow channel 405, thereby increasing the heat exchange area and ensuring the heat exchange efficiency.

[0027] A connecting pipe 18 is connected between one end of the flow channel 1 outlet pipe 408 and the upper tank 2 302, a connecting pipe 29 is connected between one end of the flow channel 1 inlet pipe 407 and the lower tank 2 301, and a connecting pipe 3 10 is connected between one end of the flow channel 2 outlet pipe 409 and the upper tank 1 202. Since the connecting pipe 3 10, the first connecting pipe 5 and the second connecting pipe 6 are partially located in the space inside the connecting cylinder 406, the connecting pipe 3 10, the first connecting pipe 5 and the second connecting pipe 6 are made of metal pipes with an insulation layer on the surface. At the same time, the surface of the connecting cylinder 406 is provided with a through hole that is compatible with the connecting pipe 3 10, the first connecting pipe 5 and the second connecting pipe 6. The through hole is threadedly connected with a sealing plug. When multiple heat exchange modules 4 are connected in sequence, the corresponding through holes are blocked by the sealing plugs to avoid air leakage and ensure the overall sealing.

[0028] A connecting pipe 411 is connected between one end of the inlet pipe 4010 of the flow channel 2 and the lower tank 1 201. The surface of the second connecting pipe 6 and near the third valve 601 and the fourth valve 602 are respectively connected with the first cleaning pipe 603 and the second cleaning pipe 604. The surface of the first cleaning pipe 603 is provided with a fifth valve 605, and the surface of the second cleaning pipe 604 is provided with a sixth valve 606.

[0029] The first valve 501, the second valve 502, the third valve 601, the fourth valve 602, the fifth valve 605 and the sixth valve 606 are all solenoid valves and are electrically connected to the control end of the controller 7, and the output ends of the temperature sensor 1 205 and the temperature sensor 2 305 are electrically connected to the input end of the controller 7. When the temperature sensor 205 detects that the temperature of the fluid in the upper tank 202 exceeds the set threshold, or the temperature sensor 305 detects that the temperature of the fluid in the upper tank 302 is lower than the set threshold, it is determined that the corresponding flow channel has insufficient heat exchange; if the flow channel 1 has insufficient heat exchange, the controller 7 opens the first valve 501 and the third valve 601, and closes the second valve 502 and the fourth valve 602; if the flow channel 2 has insufficient heat exchange, the controller 7 opens the second valve 502 and the fourth valve 602, and closes the first valve 501 and the third valve 601; before switching the medium of the auxiliary flow channel 405 to flow to the upper tank 202 or the upper tank 302, the controller 7 opens the fifth valve 605 or the sixth valve 606, and empties the residual fluid in the auxiliary flow channel 405 through the first cleaning pipe 603 or the second cleaning pipe 604, thereby avoiding fluid mixing.

[0030] The surface of one side of the outer spiral plate 402a and the inner spiral plate 402b is provided with a protruding structure, which is in a continuous wave shape, and the height difference between the wave crest and the wave trough of the protruding structure is 1-3mm. The protruding structure actually increases the inner surface area and shortens the heat exchange time. At the same time, the protruding structure causes the fluid to form a periodic disturbance in the flow channel. When the liquid flows through the wave surface, it will generate eddy currents due to the obstruction of the protrusions, destroying the original laminar state and strengthening the heat exchange between the fluid and the plate. Similarly, in order to increase the heat exchange effect of the flow channel 1 401, a threaded structure can be provided on the inner wall of the spiral tube 401a.

[0031] The two ends of the flow channel 1 401 are respectively connected with the flow channel 1 inlet pipe 407 and the flow channel 1 outlet pipe 408, one end of the flow channel 1 inlet pipe 407 and the flow channel 1 outlet pipe 408 extend to the outside of the connecting cylinder 406, the top of the flow channel 2 402 is vertically connected with the flow channel 2 outlet pipe 409, and the flow channel 2 inlet pipe 4010 is arranged at the bottom of the flow channel 2 402 and directly below the flow channel 2 outlet pipe 409. The heat exchange module 4 is provided with a plurality of heat exchange modules 4 along the axial direction of the connecting cylinder 406. The directions are arranged in sequence, one end of the flow channel one outlet pipe 408 is connected to one end of the flow channel one inlet pipe 407 on the adjacent heat exchange module 4 by a connecting pipe five 12, one end of the flow channel two outlet pipe 409 is connected to the flow channel two inlet pipe 4010 on the adjacent heat exchange module 4, one end of the auxiliary flow channel outlet pipe 4011 is connected to the auxiliary flow channel inlet pipe 4012 on the adjacent heat exchange module 4, and the interfaces of the pipes are arranged in the corresponding positions, which is convenient for the connection of the pipes and improves the working efficiency of the heat exchange module 4.

[0032] Connecting flanges 4013 are provided at both ends of the connecting cylinder 406 , and two adjacent heat exchange modules 4 are fixedly connected via the connecting flanges 4013 , which facilitates the connection.

[0033] The surface of the heat exchange module 4 is provided with a corrosion-resistant coating to increase the service life.

[0034] A chemical plant generates a large amount of high-temperature wastewater, about 92°C, during its production process. The following requirements must be met simultaneously: 1. The wastewater must be cooled to below 50°C before it can be discharged; 2. The wastewater waste heat must be used to preheat the boiler feed water, with an initial temperature of 15°C; 3. The heat in the exhaust gas must be recovered for factory heating, with an exhaust gas temperature of 120°C.

[0035] The three-medium heat exchanger of the present invention is used, and the specific parameters are as follows: Three groups of heat exchange modules 4 are used: each group of modules has a diameter of 40 cm and a height of 70 cm; Fluid 1 is high-temperature wastewater: flow rate 5m³ / h, entering lower tank 1 201 from fluid 1 inlet pipe 203; Fluid 2 is boiler feed water: flow rate 3m³ / h, entering lower tank 2 301 from fluid 2 inlet pipe 303; Exhaust gas: flow rate 2000m³ / h, connected through the connecting cylinder 406 and the connecting ring 101 at the top.

[0036] In the basic heat exchange stage, high-temperature wastewater flows through flow channel 1 401 and indirectly exchanges heat with boiler feed water in flow channel 2 402 through the wall of the spiral tube. The wastewater temperature drops from 92°C to 65°C. The boiler feed water absorbs heat and heats up from 15°C to 45°C. It is sent to the boiler for recycling. The wastewater flows through the outer fin 403 and the inner fin 404, and the temperature drops from 120°C to 85°C. The heat is used for heating the factory building. During the start-up phase of the auxiliary flow channel, the temperature sensor 205 detects that the wastewater temperature of the upper tank 202 is 65°C, where the safety threshold is set at 60°C, and determines that the heat exchange is insufficient. Then the controller 7 opens the first valve 501 and the fifth valve 605, closes the second valve 502 and the fourth valve 602, and drains the boiler feed water remaining in the auxiliary flow channel 405. Then the third valve 601 is opened and the fifth valve 605 is closed. The high-temperature wastewater with a flow rate of about 2m³ / h is switched to the auxiliary flow channel 405 for further heat dissipation. At this time, the overall temperature of the wastewater drops from 65°C to 50°C, meeting the discharge requirements. When the factory increases production, two new sets of heat exchange modules are added, which are quickly spliced ​​through connecting flange 4013 and connected to the corresponding pipes. The total treatment capacity of high-temperature wastewater is increased to 8m³ / h.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-medium heat exchanger with an auxiliary heat exchange structure, characterized in that: include: A base (1), wherein a first liquid collecting tank (2) and a second liquid collecting tank (3) are respectively arranged on the left and right sides of the top of the base (1), wherein the first liquid collecting tank (2) comprises a first lower tank (201) and a first upper tank (202), and the second liquid collecting tank (3) comprises a second lower tank (301) and a second upper tank (302); A heat exchange module (4), the heat exchange module (4) being fixedly mounted on the top of the base (1) and being located between the first liquid collecting tank (2) and the second liquid collecting tank (3), the heat exchange module (4) comprising a first flow channel (401) and a second flow channel (402), the first flow channel (401) being a cylindrical structure formed by a spiral tube (401a), the second flow channel (402) being a closed space formed by a gap formed by an outer spiral plate (402a) and an inner spiral plate (402b) wrapping the spiral tube (401a), the outer surfaces of the first flow channel (401) and the second flow channel (402) being provided with an outer fin (403), the surface of the outer fin (403) being fixedly connected with a connecting cylinder (406), the inside of the first flow channel (401) and the second flow channel (402) being further provided with an auxiliary flow channel (405), the surface of the auxiliary flow channel (405) being provided with an inner fin (404); The inlet end of the auxiliary flow channel (405) is connected to the lower tank 1 (201) and the lower tank 2 (301) through a first connecting pipe (5), and the outlet end of the auxiliary flow channel (405) is connected to the upper tank 1 (202) and the upper tank 2 (302) through a second connecting pipe (6). A first valve (501) and a second valve (502) are respectively arranged on the surface of the first connecting pipe (5) and near both ends, and a third valve (601) and a fourth valve (602) are respectively arranged on the surface of the second connecting pipe (6) and near both ends. A temperature sensor 1 (205) is arranged on the surface of the upper tank 1 (202), and a temperature sensor 2 (305) is arranged on the surface of the upper tank 2 (302). A controller (7) is also arranged on the top of the base (1). The controller (7) controls the opening and closing of the first to fourth valves according to signals from the temperature sensor 1 (205) and the temperature sensor 2 (305), so as to switch the flow direction of the medium in the auxiliary flow channel (405).

2. The three-medium heat exchanger with an auxiliary heat exchange structure according to claim 1, characterized in that: A protruding structure is provided on the surface of one side of the outer spiral plate (402a) and the inner spiral plate (402b), the protruding structure is in a continuous wave shape, and the height difference between the wave crest and the wave trough of the protruding structure is 1-3 mm.

3. The three-medium heat exchanger with an auxiliary heat exchange structure according to claim 1, characterized in that: The two ends of the flow channel 1 (401) are respectively connected to a flow channel 1 inlet pipe (407) and a flow channel 1 outlet pipe (408); one end of the flow channel 1 inlet pipe (407) and the flow channel 1 outlet pipe (408) extend to the outside of the connecting cylinder (406); the top of the flow channel 2 (402) is vertically connected to a flow channel 2 outlet pipe (409); the bottom of the flow channel 2 (402) is provided with a flow channel 2 inlet pipe (4010) located directly below the flow channel 2 outlet pipe (409); the top of the auxiliary flow channel (405) is vertically connected to an auxiliary flow channel outlet pipe (4011); and the bottom of the auxiliary flow channel (405) is provided with an auxiliary flow channel inlet pipe (4012) located directly below the auxiliary flow channel outlet pipe (4011).

4. The three-medium heat exchanger with an auxiliary heat exchange structure according to claim 3, characterized in that: A connecting pipe (8) is connected between one end of the outlet pipe (408) of the flow channel 1 and the upper tank 2 (302); a connecting pipe (9) is connected between one end of the inlet pipe (407) of the flow channel 1 and the lower tank 2 (301); a connecting pipe (10) is connected between one end of the outlet pipe (409) of the flow channel 2 and the upper tank 1 (202); a connecting pipe (11) is connected between one end of the inlet pipe (4010) of the flow channel 2 and the lower tank 1 (201); a first cleaning pipe (603) and a second cleaning pipe (604) are respectively connected on the surface of the second connecting pipe (6) near the third valve (601) and the fourth valve (602); a fifth valve (605) is provided on the surface of the first cleaning pipe (603); and a sixth valve (606) is provided on the surface of the second cleaning pipe (604).

5. The three-medium heat exchanger with an auxiliary heat exchange structure according to claim 4, characterized in that: The heat exchange modules (4) are provided in plurality, and the plurality of heat exchange modules (4) are arranged in sequence along the axial direction of the connecting cylinder (406); a connecting pipe five (12) is connected between one end of the flow channel one outlet pipe (408) and one end of the flow channel one inlet pipe (407) on the adjacent heat exchange module (4); one end of the flow channel two outlet pipe (409) is connected to the flow channel two inlet pipe (4010) on the adjacent heat exchange module (4); and one end of the auxiliary flow channel outlet pipe (4011) is connected to the auxiliary flow channel inlet pipe (4012) on the adjacent heat exchange module (4).

6. The three-medium heat exchanger with an auxiliary heat exchange structure according to claim 4, characterized in that: The first valve (501), the second valve (502), the third valve (601), the fourth valve (602), the fifth valve (605) and the sixth valve (606) are all solenoid valves and are electrically connected to the control end of the controller (7); the output ends of the temperature sensor 1 (205) and the temperature sensor 2 (305) are electrically connected to the input end of the controller (7); When the temperature sensor 1 (205) detects that the temperature of the fluid in the upper tank 1 (202) exceeds a set threshold, or the temperature sensor 2 (305) detects that the temperature of the fluid in the upper tank 2 (302) is lower than a set threshold, it is determined that the corresponding flow channel has insufficient heat exchange; if the flow channel 1 has insufficient heat exchange, the controller (7) opens the first valve (501) and the third valve (601), and closes the second valve (502) and the fourth valve (602); if the flow channel 2 has insufficient heat exchange, the controller (7) opens the second valve (502) and the fourth valve (602), and closes the first valve (501) and the third valve (601); before switching the medium of the auxiliary flow channel (405) to flow to the upper tank 1 (202) or the upper tank 2 (302), the controller (7) opens the fifth valve (605) or the sixth valve (606), and empties the residual fluid in the auxiliary flow channel (405) through the first cleaning pipe (603) or the second cleaning pipe (604).

7. The three-medium heat exchanger with an auxiliary heat exchange structure according to claim 5, characterized in that: Connecting flanges (4013) are provided at both ends of the connecting cylinder (406), and two adjacent heat exchange modules (4) are fixedly connected via the connecting flanges (4013). A connecting ring (101) having an inner diameter equal to that of the connecting cylinder (406) is fixedly connected to the bottom of the base (1).

8. The three-medium heat exchanger with an auxiliary heat exchange structure according to claim 1, characterized in that: Ventilation holes are provided on the surfaces of the outer fins (403) and the inner fins (404).

9. The three-medium heat exchanger with an auxiliary heat exchange structure according to claim 1, characterized in that: The surface of the lower tank 1 (201) is connected to a fluid 1 inlet pipe (203), the surface of the upper tank 1 (202) is connected to a fluid 1 outlet pipe (204), the surface of the lower tank 2 (301) is connected to a fluid 2 inlet pipe (303), and the surface of the upper tank 2 (302) is connected to a fluid 2 outlet pipe (304).

10. The three-medium heat exchanger with an auxiliary heat exchange structure according to claim 1, characterized in that: The surface of the heat exchange module (4) is provided with a corrosion-resistant coating.

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