A three-medium heat exchanger with an auxiliary heat exchange structure

Abstract

The present invention discloses a three-medium heat exchanger with an auxiliary heat exchange structure, and the present invention relates to the technical field of heat exchangers. The heat exchanger includes a base, and a first liquid collection tank and a second liquid collection tank are respectively arranged on the left and right sides of the top of the base; a heat exchange module, the heat exchange module includes a first flow channel and a second flow channel, the first flow channel is formed into a cylindrical structure by a spiral tube, the second flow channel is formed by the gap between an outer spiral plate and an inner spiral plate wrapping the spiral tube to form a closed space, outer fins are arranged on the outer surfaces of the first flow channel and the second flow channel, a connecting cylinder is fixedly connected to the surface of the outer fins, an auxiliary flow channel is further arranged inside the first flow channel and the second flow channel, and inner fins are arranged on the surface of the auxiliary flow channel; a controller is further arranged on the top of the base. This three-medium heat exchanger with an auxiliary heat exchange structure solves the problems of low heat exchange efficiency and inability to dynamically adjust of the traditional three-medium heat exchanger, and realizes the efficient and flexible heat exchange function.

Description

Technical Field

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

[0002] A heat exchanger is a very common device and is widely used in various fields of our life and industry. For example, in air conditioners, refrigerators, automotive engine cooling systems, and even in factory boilers and chemical reactors, heat exchangers play an important role. 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 progress of industrial technology, more and more scenarios require handling heat exchange problems of multiple media simultaneously. For example, in chemical production, it may be necessary to cool two different liquids simultaneously while using air to recover waste heat; in new energy vehicles, efficient heat exchange is also required between battery coolant, air conditioner refrigerant, and cabin air. This demand has given rise to the emergence of three-medium heat exchangers. A three-medium heat exchanger can handle three different media (usually two liquids and one gas) simultaneously and allow 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 disclosed in publication number CN113606961A forms an auxiliary heat exchange structure by closely fitting composite tube groups and adds auxiliary single tubes to expand the heat exchange area of the third medium. However, it is difficult to balance the flow distribution between the auxiliary single tubes and the second medium tubes, and at the same time, it is impossible to dynamically adjust the heat exchange path 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 path to enhance heat exchange, resulting in insufficient heat exchange under some working conditions. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] In view of the deficiencies of 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.

[0007] (II) Technical Solutions

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: A three-medium heat exchanger with an auxiliary heat exchange structure, comprising:

[0009] A base, on the left and right sides of the top of the base, a first liquid collecting tank and a second liquid collecting tank are respectively arranged. The first liquid collecting tank includes a first lower tank and a first upper tank, and the second liquid collecting tank includes a second lower tank and a second upper tank;

[0010] A heat exchange module, which is fixedly installed on the top of the base and located between the first liquid collection tank and the second liquid collection tank. The heat exchange module includes a first flow channel and a second flow channel. The first flow channel is formed into a cylindrical structure by a spiral tube. The second flow channel is formed by the gap between an outer spiral plate and an inner spiral plate wrapping the spiral tube to form a closed space. Outer fins are arranged on the outer surfaces of the first flow channel and the second flow channel. A connecting cylinder is fixedly connected to the surface of the outer fins. An auxiliary flow channel is also arranged inside the first flow channel and the second flow channel. Inner fins are arranged on the surface of the auxiliary flow channel;

[0011] The inlet end of the auxiliary flow channel is communicated with the first lower tank and the second lower tank through a first connecting pipe. The outlet end of the auxiliary flow channel is communicated with the first upper tank and the second upper tank 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. A third valve and a fourth valve are respectively arranged on the surface of the second connecting pipe near both ends. A first temperature sensor is arranged on the surface of the first upper tank. A second temperature sensor is arranged on the surface of the second upper tank. 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 first temperature sensor and the second temperature sensor to switch the medium flow direction of the auxiliary flow channel.

[0012] Preferably, a convex structure is arranged on the surface of one side of the outer spiral plate and the inner spiral plate. The convex structure is in a continuous wavy shape. The height difference between the wave crest and the wave trough of the convex structure is 1-3 mm.

[0013] Preferably, both ends of the first flow channel are respectively communicated with a first flow channel inlet pipe and a first flow channel outlet pipe. One ends of the first flow channel inlet pipe and the first flow channel outlet pipe extend to the outside of the connecting cylinder. A second flow channel outlet pipe is vertically communicated with the top of the second flow channel. A second flow channel inlet pipe is arranged at the bottom of the second flow channel and directly below the second flow channel outlet pipe. An auxiliary flow channel outlet pipe is vertically communicated with the top end of the auxiliary flow channel. An auxiliary flow channel inlet pipe is arranged at the bottom of the auxiliary flow channel and directly below the auxiliary flow channel outlet pipe.

[0014] Preferably, a first connecting pipe is communicated between one end of the first flow channel outlet pipe and the second upper tank. A second connecting pipe is communicated between one end of the first flow channel inlet pipe and the second lower tank. A third connecting pipe is communicated between one end of the second flow channel outlet pipe and the first upper tank. A fourth connecting pipe is communicated between one end of the second flow channel inlet pipe and the first lower tank. A first cleaning pipe and a second cleaning pipe are respectively communicated with the surface of the second connecting pipe near the third valve and the fourth valve. A fifth valve is arranged on the surface of the first cleaning pipe. A sixth valve is arranged on the surface of the second cleaning pipe.

[0015] Preferably, a plurality of the heat exchange modules are provided, and the plurality of heat exchange modules are arranged in sequence along the axial direction of the connecting cylinder. A fifth connecting pipe is communicated between one end of the first flow channel outlet pipe and one end of the first flow channel inlet pipe on an adjacent heat exchange module. One end of the second flow channel outlet pipe is communicated with the second flow channel inlet pipe on an adjacent heat exchange module, and one end of the auxiliary flow channel outlet pipe is communicated with the auxiliary flow channel inlet pipe on an adjacent heat exchange module.

[0016] 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. The output ends of the first temperature sensor and the second temperature sensor are electrically connected to the input end of the controller. When the first temperature sensor detects that the fluid temperature in the first upper tank exceeds the set threshold, or the second temperature sensor detects that the fluid temperature in the second upper tank is lower than the set threshold, it is determined that the heat exchange of the corresponding flow channel is insufficient; if the heat exchange of the first flow channel is insufficient, the controller opens the first valve and the third valve and closes the second valve and the fourth valve; if the heat exchange of the second flow channel is insufficient, the controller opens the second valve and the fourth valve and closes the first valve and the third valve; before switching the medium flow direction of the auxiliary flow channel to the first upper tank or the second upper tank, the controller opens the fifth valve or the sixth valve, and empties the residual fluid in the auxiliary flow channel through the first cleaning pipe or the second cleaning pipe.

[0017] Preferably, connecting flanges are provided at both ends of the connecting cylinder, and adjacent heat exchange modules are fixedly connected through the connecting flanges. A connecting ring with the same inner diameter as the connecting cylinder is fixedly connected to the bottom of the base.

[0018] Preferably, ventilation holes are provided on the surfaces of the outer fins and the inner fins.

[0019] Preferably, a first fluid inlet pipe is communicated with the surface of the first lower tank, a first fluid outlet pipe is communicated with the surface of the first upper tank, a second fluid inlet pipe is communicated with the surface of the second lower tank, and a second fluid outlet pipe is communicated with the surface of the second upper tank.

[0020] Preferably, a corrosion-resistant coating is provided on the surface of the heat exchange module.

[0021] (3) Beneficial effects

[0022] The present invention provides a three-medium heat exchanger with an auxiliary heat exchange structure, which has the following beneficial effects:

[0023] (1) Through the spiral design of the first flow channel and arranging the second flow channel in the gap of the spiral first flow channel, the heat exchange between the medium in the first flow channel and the medium in the second flow channel is realized. At the same time, both sides of the first flow channel are also located outside the second flow channel. At the same time, fins are provided on the inner and outer cylindrical layers formed by the second flow channel, realizing the heat exchange between the medium in the first flow channel and the medium in the second flow channel and the gas, and realizing the heat exchange among the three media.

[0024] (2) The outer and inner spiral plates of the second flow channel are provided with convex structures, which increase the inner surface area, enhance the fluid disturbance, improve the heat exchange efficiency. At the same time, the inner and outer fins are provided to improve the heat exchange efficiency between the gas and the first and second flow channels.

[0025] (3) By arranging a spiral auxiliary flow channel inside the inner fin and controlling it with the corresponding valve of the auxiliary flow channel, the flow direction of the medium can be switched, and dynamic adjustment can be carried out according to the achieved heat exchange effect, improving the heat exchange effect. Through the arranged controller and temperature sensor, intelligent regulation is realized.

[0026] (4) The main part of the heat exchange is modularly designed, and the heat exchange modules can be increased or decreased according to the on-site requirements, expanding the adaptation range. At the same time, the modular design also reduces the later maintenance cost. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the overall structure from the first perspective of the present invention;

[0028] Figure 2 It is a schematic diagram of the overall structure from the second perspective of the present invention;

[0029] Figure 3 It is a schematic diagram of the overall structure from the third perspective of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the heat exchange module of the present invention;

[0031] Figure 5 It is a cross-sectional view of the heat exchange module of the present invention;

[0032] Figure 6 It is an exploded view of the heat exchange module of the present invention;

[0033] Figure 7 It is a connection schematic diagram of the spiral tube, the outer spiral plate and the inner spiral plate of the present invention.

[0034] In the figure: 1 - base, 101 - connecting ring, 2 - first liquid collection tank, 201 - lower tank one, 202 - upper tank one, 203 - fluid one inlet pipe, 204 - fluid one outlet pipe, 205 - temperature sensor one, 3 - second liquid collection tank, 301 - lower tank two, 302 - upper tank two, 303 - fluid two inlet pipe, 304 - fluid two outlet pipe, 305 - temperature sensor two, 4 - heat exchange module, 401 - flow channel one, 401a - spiral pipe, 402 - flow channel two, 402a - outer spiral plate, 402b - inner spiral plate, 403 - outer fin, 404 - inner fin, 405 - auxiliary flow channel, 406 - connecting cylinder, 407 - flow channel one inlet pipe, 408 - flow channel one outlet pipe, 409 - flow channel two outlet pipe, 4010 - flow channel two inlet pipe, 4011 - auxiliary flow channel outlet pipe, 4012 - auxiliary flow channel inlet pipe, 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 - first connecting pipe, 9 - second connecting pipe, 10 - third connecting pipe, 11 - fourth connecting pipe, 12 - fifth connecting pipe. Detailed implementation manner

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figure 1-7 , the present invention provides a technical solution: a three - medium heat exchanger with an auxiliary heat exchange structure, including:

[0037] Base 1, on the left and right sides of the top of the base 1, a first liquid collection tank 2 and a second liquid collection tank 3 are respectively arranged. The first liquid collection tank 2 includes a lower tank one 201 and an upper tank one 202. The surface of the lower tank one 201 is communicated with a fluid one inlet pipe 203, and the surface of the upper tank one 202 is communicated with a fluid one outlet pipe 204. The second liquid collection tank 3 includes a lower tank two 301 and an upper tank two 302. The surface of the lower tank two 301 is communicated with a fluid two inlet pipe 303, and the surface of the upper tank two 302 is communicated with a fluid two outlet pipe 304;

[0038] The heat exchange module 4 is fixedly installed on the top of the base 1 and is located between the first liquid collecting tank 2 and the second liquid collecting tank 3. The heat exchange module 4 includes a first flow channel 401 and a second flow channel 402. The first flow channel 401 is formed into a cylindrical structure by a spiral tube 401a. The cross-section of the spiral tube 401a is circular or rectangular. The second flow channel 402 is formed by the gap between an outer spiral plate 402a and an inner spiral plate 402b wrapping the spiral tube 401a to form a closed space, and is fixed to the surface of the spiral tube 401a by welding during processing. The structure formed by the first flow channel 401 and the second flow channel 402 is approximately cylindrical. Outer fins 403 are provided on the outer surfaces of the first flow channel 401 and the second flow channel 402. A connecting cylinder 406 is fixedly connected to the surface of the outer fins 403. The setting of the connecting cylinder 406 facilitates the connection with a gas pipeline. An auxiliary flow channel 405 is further provided inside the first flow channel 401 and the second flow channel 402. Inner fins 404 are provided on the surface of the auxiliary flow channel 405. One side of the inner fins 404 is in contact with and fixed to the inner surfaces of the first flow channel 401 and the second flow channel 402.

[0039] The distance between the outer spiral plate 402a and the inner spiral plate 402b is less than the diameter or width of the spiral tube 401a, which ensures that both sides of the first flow channel 401 are on the outside, enhancing the heat exchange effect between the inner fins 404 and the outer fins 403. Ventilation holes are provided on the surfaces of the outer fins 403 and the inner fins 404. The ventilation holes cause local disturbance of the gas when it flows through the fins, break the laminar boundary layer, significantly improve the heat transfer coefficient. At the same time, the ventilation holes guide the uniform distribution of the gas, avoiding 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 when the gas passes through the fins.

[0040] A connecting ring 101 with an inner diameter equal to that of the connecting cylinder 406 is fixedly connected to the bottom of the base 1. Ventilation holes are provided at the bottom of the base 1 and inside the connecting ring 101. The heat exchange module 4 is fixed in the ventilation holes, and it is convenient to connect with the other end of the gas pipeline through the connecting ring 101.

[0041] The inlet end of the auxiliary flow channel 405 is connected to the first lower tank 201 and the second lower tank 301 through the first connecting pipe 5. The first connecting pipe 5 is arranged below the base 1. Through holes adapted to the first connecting pipe 5 are provided on the surface of the base 1 and the surface of the connecting ring 101. The outlet end of the auxiliary flow channel 405 is connected to the first upper tank 202 and the second upper tank 302 through the second connecting pipe 6. The top end of the auxiliary flow channel 405 is vertically connected to an auxiliary flow channel outlet pipe 4011. An auxiliary flow channel inlet pipe 4012 is arranged at the bottom end of the auxiliary flow channel 405 and directly below the auxiliary flow channel outlet pipe 4011. Specifically, a tee is provided at one end of the auxiliary flow channel outlet pipe 4011 and the auxiliary flow channel inlet pipe 4012 to facilitate the connection of the first connecting pipe 5 and the second connecting pipe 6. First valves 501 and second valves 502 are respectively arranged on the surface of the first connecting pipe 5 near both ends. Third valves 601 and fourth valves 602 are respectively arranged on the surface of the second connecting pipe 6 near both ends. The first valve 501 and the third valve 601 are arranged near the first liquid collecting tank 2. A first temperature sensor 205 is arranged on the surface of the first upper tank 202, and a second temperature sensor 305 is arranged on the surface of the second upper tank 302. A controller 7 is further arranged 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 first temperature sensor 205 and the second temperature sensor 305 to switch the flow direction of the medium in the auxiliary flow channel 405. When the heat exchange of the fluid in the first flow channel or the second flow channel is insufficient, the corresponding valve is opened to allow the medium in the corresponding flow channel to flow into the auxiliary flow channel 405, increasing the heat exchange area and ensuring the heat exchange efficiency.

[0042] A first connecting pipe 8 is connected between one end of the first flow channel outlet pipe 408 and the second upper tank 302. A second connecting pipe 9 is connected between one end of the first flow channel inlet pipe 407 and the second lower tank 301. A third connecting pipe 10 is connected between one end of the second flow channel outlet pipe 409 and the first upper tank 202. Since parts of the third connecting pipe 10, the first connecting pipe 5, and the second connecting pipe 6 are located in the space inside the connecting cylinder 406, the third connecting pipe 10, the first connecting pipe 5, and the second connecting pipe 6 are made of metal pipes with heat-insulating layers on their surfaces. At the same time, through holes adapted to the third connecting pipe 10, the first connecting pipe 5, and the second connecting pipe 6 are provided on the surface of the connecting cylinder 406, and sealing plugs are threadedly connected to the through holes. 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 airtightness.

[0043] A fourth connecting pipe 11 is connected between one end of the second flow channel inlet pipe 4010 and the first lower tank 201. A first cleaning pipe 603 and a second cleaning pipe 604 are respectively connected to the surface of the second connecting pipe 6 near the third valve 601 and the fourth valve 602. A fifth valve 605 is arranged on the surface of the first cleaning pipe 603, and a sixth valve 606 is arranged on the surface of the second cleaning pipe 604.

[0044] 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 terminal of the controller 7. The output terminals of the first temperature sensor 205 and the second temperature sensor 305 are electrically connected to the input terminal of the controller 7. When the first temperature sensor 205 detects that the fluid temperature in the first upper tank 202 exceeds the set threshold, or the second temperature sensor 305 detects that the fluid temperature in the second upper tank 302 is lower than the set threshold, it is determined that the heat exchange of the corresponding flow channel is insufficient; if the heat exchange of the first flow channel is insufficient, 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 heat exchange of the second flow channel is insufficient, 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 flow direction of the auxiliary flow channel 405 to the first upper tank 202 or the second 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, avoiding fluid mixing.

[0045] Protrusion structures are provided on the surfaces of one side of the outer spiral plate 402a and the inner spiral plate 402b. The protrusion structures are in a continuous wave shape. The height difference between the wave crests and wave troughs of the protrusion structures is 1-3 mm. The protrusion structures actually increase the inner surface area and shorten the heat exchange time. At the same time, the protrusion structures cause the fluid to form periodic disturbances in the flow channel. When the liquid flows through the wavy surface, eddy currents will be generated due to the obstruction of the protrusions, destroying the original laminar flow state and strengthening the heat exchange between the fluid and the plate. Similarly, in order to increase the heat exchange effect of the first flow channel 401, a thread structure can be provided on the inner wall of the spiral tube 401a.

[0046] The two ends of the first flow channel 401 are respectively communicated with a first flow channel inlet pipe 407 and a first flow channel outlet pipe 408. One ends of the first flow channel inlet pipe 407 and the first flow channel outlet pipe 408 extend to the outside of the connecting cylinder 406. The top of the second flow channel 402 is vertically communicated with a second flow channel outlet pipe 409. A second flow channel inlet pipe 4010 is provided at the bottom of the second flow channel 402 and directly below the second flow channel outlet pipe 409. There are multiple heat exchange modules 4, and the multiple heat exchange modules 4 are sequentially arranged along the axial direction of the connecting cylinder 406. A fifth connecting pipe 12 is communicated between one end of the first flow channel outlet pipe 408 and one end of the first flow channel inlet pipe 407 on the adjacent heat exchange module 4. One end of the second flow channel outlet pipe 409 is communicated with the second flow channel inlet pipe 4010 on the adjacent heat exchange module 4. One end of the auxiliary flow channel outlet pipe 4011 is communicated with the auxiliary flow channel inlet pipe 4012 on the adjacent heat exchange module 4. The interfaces of the pipelines are arranged at corresponding positions, which is convenient for pipeline connection and improves the working efficiency of adding the heat exchange module 4.

[0047] Connection flanges 4013 are provided at both ends of the connection cylinder 406. Two adjacent heat exchange modules 4 are fixedly connected through the connection flanges 4013, facilitating the connection.

[0048] The surface of the heat exchange module 4 is provided with a corrosion-resistant coating to improve its service life.

[0049] During the production process of a certain chemical plant, a large amount of high-temperature wastewater is generated, about 92 °C, and the following requirements need to be met simultaneously: 1. The wastewater needs to be cooled to below 50 °C before it can be discharged; 2. Utilize the waste heat of the wastewater to preheat the boiler make-up water, with an initial temperature of 15 °C; 3. Recover the heat in the waste gas for factory heating, and the waste gas temperature is 120 °C.

[0050] The three-medium heat exchanger of the present invention is adopted, and the specific parameters are as follows:

[0051] 3 groups of heat exchange modules 4 are adopted: the size of each group of modules is 40 cm in diameter and 70 cm in height;

[0052] Fluid one is high-temperature wastewater: the flow rate is 5 m³ / h, and it enters the lower tank one 201 through the fluid one inlet pipe 203;

[0053] Fluid two is boiler make-up water: the flow rate is 3 m³ / h, and it enters the lower tank two 301 through the fluid two inlet pipe 303;

[0054] Waste gas: the flow rate is 2000 m³ / h, and it is connected through the connection cylinder 406 and the connection ring 101 at the top.

[0055] In the basic heat exchange stage, the high-temperature wastewater flows through the flow channel one 401 and indirectly exchanges heat with the boiler make-up water in the flow channel two 402 through the wall of the spiral tube. The temperature of the wastewater drops from 92 °C to 65 °C. After absorbing heat, the boiler make-up water rises from 15 °C to 45 °C and is sent to the boiler for recycling. The waste gas flows through the outer fins 403 and the inner fins 404, and the temperature drops from 120 °C to 85 °C, and the heat is used for plant heating;

[0056] In the auxiliary flow channel startup stage, the temperature sensor one 205 detects that the wastewater temperature in the upper tank one 202 is 65 °C, and the set safety threshold is 60 °C. It is determined that the heat exchange is insufficient. Subsequently, 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 residual boiler make-up water in the auxiliary flow channel 405. Subsequently, the third valve 601 is opened and the fifth valve 605 is closed. The high-temperature wastewater with a flow rate of about 2 m³ / 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;

[0057] When the factory increases production, 2 additional groups of heat exchange modules are added, quickly spliced through the connection flanges 4013, and the corresponding pipelines are connected. The total treatment capacity of the high-temperature wastewater is increased to 8 m³ / h.

[0058] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and 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 between an outer spiral plate (402a) and an inner spiral plate (402b) wrapping the spiral tube (401a), the The outer surfaces of flow channel one (401) and flow channel two (402) are provided with external fins (403), the surfaces of the external fins (403) are fixedly connected with connecting cylinders (406), the interiors of flow channel one (401) and flow channel two (402) are also provided with auxiliary flow channels (405), the surfaces of the auxiliary flow channels (405) are provided with internal fins (404), the flow channel one (401) is connected with liquid collecting tank two (3) through a pipeline, and the flow channel two (402) is connected with liquid collecting tank one (2) through a pipeline; 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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