A heating device based on small temperature difference water circulation

Abstract

The application belongs to the technical field of heat supply equipment, and particularly relates to a heat supply equipment based on small-temperature-difference water circulation, which comprises a heat exchange assembly, a return water end difference induction assembly, a throttling control assembly and a clamping assembly, the return water end difference induction assembly is arranged on the heat exchange assembly, the throttling control assembly is arranged on the return water end difference induction assembly, and the heat exchange assembly is arranged in the clamping assembly. The application provides a technical scheme in which the heat exchange assembly, the return water end difference induction assembly and the throttling control assembly are matched. Since the temperature in the primary network water supply pipe is constant, the temperature of the hot water delivered to the user can be maintained stable by stabilizing the temperature difference between the water supply pipes of the primary network and the secondary network.

Description

Technical Field

[0001] This invention belongs to the field of heating equipment technology, specifically referring to a heating equipment based on small temperature difference water circulation. Background Technology

[0002] Municipal heating systems are divided into primary and secondary networks, with heat exchange equipment in between. The terms "primary network" and "secondary network" are used in a broad sense. The main difference is that the primary network uses high-temperature and high-pressure heating, which mainly delivers heat from the heat source to the secondary distribution point. Its characteristic is high efficiency in heat transfer. The secondary network uses relatively low-temperature (45-50 degrees Celsius) and low-pressure heating, which is delivered to the user. Its characteristic is safety.

[0003] Since heat exchange occurs through a heat exchanger, the lower the temperature difference between the primary and secondary return water networks, the more thorough the heat exchange and the higher the heat utilization rate. (If the primary return water temperature is significantly higher than the secondary return water temperature, it indicates that there is still heat available for transfer in the primary network.)

[0004] Increasing the heat exchange area is a way to make heat exchange more efficient. However, heat exchangers are mostly parallel flow channels. If the flow channel is too wide, the flow velocity will be too slow, the fluid's ability to scour the flow channel will be weakened, and impurities will easily accumulate. Furthermore, the heat transfer efficiency of the heat exchanger is strongly correlated with the fluid velocity (Reynolds number).

[0005] Moreover, the heat required by users is not constant due to factors such as day and night and temperature. If the primary network heating rate is constant, the temperature of the secondary network heating will fluctuate when the heat demand at the user end changes. Summary of the Invention

[0006] In view of the above situation and to overcome the defects of the prior art, the present invention provides a heating device based on small temperature difference water circulation. In order to maintain the stability of the heat supplied to users, the present invention proposes a technical solution of heat exchange component, return water end difference sensing component and throttling control component working together. Since the temperature in the primary network water supply pipe is constant, the temperature of the hot water delivered to users can be maintained stable by stabilizing the temperature difference between the primary and secondary network water supply pipes.

[0007] Furthermore, by monitoring the difference between the return water pipes of the primary and secondary networks, the current heating efficiency of the primary network can be fed back. If the difference is too large, more heat exchange paths need to be added to achieve more efficient heat exchange. If the heat exchange paths are already sufficient, they need to be reduced appropriately. This avoids the problem of slow flow velocity due to excessively wide flow channels (when the flow velocity is too slow, the fluid's ability to scour the flow channel is weakened, impurities are easily accumulated, and the heat transfer coefficient K value of the heat exchanger will also decrease).

[0008] The technical solution adopted by the present invention is as follows: The present invention proposes a heating device based on small temperature difference water circulation, including a heat exchange component, a return water end difference sensing component, a throttling control component and a clamping component. The return water end difference sensing component is disposed on the heat exchange component, the throttling control component is disposed on the return water end difference sensing component, and the heat exchange component is disposed in the clamping component.

[0009] The heat exchange assembly includes heat exchange plates, end plates, and circulating water pipes. The heat exchange plates are arranged in an array, and the end plates are located at both ends of the heat exchange plates. The heat exchange plates are provided with pipe sections and flow channels, and the circulating water pipes are connected to the pipe sections and flow channels.

[0010] There are several relatively independent chambers between the heat exchange plates, in which the liquids of the primary and secondary networks flow alternately, thereby achieving the technical purpose of heat exchange.

[0011] Furthermore, the circulating water pipe is specifically divided into a primary network water supply pipe and a secondary network water supply pipe and a secondary network water return pipe; the return water differential sensing component and the throttling control component are each provided in two sets, one set is located between the primary network and the secondary network water return pipe, and the other set is located between the primary network and the secondary network water supply pipe.

[0012] Since the temperature in the primary water supply pipe remains constant, the temperature of the hot water delivered to users can be kept stable by stabilizing the temperature difference between the primary and secondary water supply pipes.

[0013] By monitoring the difference in return water between the primary and secondary networks, it is possible to get feedback on the current range of heating efficiency of the primary network.

[0014] Preferably, the return water differential sensing component includes a sensing cavity, a piston plate, and a filling block. The sensing cavity consists of a square portion and an annular portion symmetrically arranged at both ends. The sensing cavity is sleeved on the circulating water pipe through the annular portion. The piston plate is slidably disposed in the square portion, and the filling block is disposed on the inner side of the piston plate.

[0015] The two annular sections sense the temperature inside the corresponding circulating water pipe in a non-contact manner. When the temperature difference between the two sides changes, the piston plate and the filling block will push the sliding control plate to slide, thereby realizing the sliding adjustment of the sliding controller.

[0016] Furthermore, the throttling control assembly includes a sliding control plate and a sliding controller. The sliding control plate is slidably disposed in the square portion and located between the filling blocks. The sliding controller is disposed outside the square portion.

[0017] The sliding controller is a sliding controller with a certain stroke. Its type varies depending on the connected load. In this invention, the sliding controller connected to the solenoid valve can control the movement direction of the valve disc in the solenoid valve through its own sliding direction; the sliding controller connected to the indicator can control the light color or reading of the indicator through its own sliding position.

[0018] Preferably, the heat exchange assembly further includes a solenoid valve, which is located on the water supply pipe of the primary network. The solenoid valve is controlled by one of the sliding controllers, and the other of the sliding controllers is connected to an indicator.

[0019] Furthermore, the clamping assembly includes an end clamp, a stud, and a nut. The end clamp is provided with a bolt hole, and the heat exchange plate is provided with a guide hole. The stud passes through the guide hole and the bolt hole. The nut is located outside the end clamp and is threadedly connected to the stud. The end clamp is also provided with a pipe joint opposite to the pipe section and the flow channel section. The circulating water pipe clamp is fitted into the pipe joint.

[0020] Studs can be used to position and lock the heat exchange plates and end plates.

[0021] Furthermore, it also includes a sliding assembly, a transmission assembly, and a sliding drive assembly, wherein the sliding assembly is slidably disposed in the heat exchange assembly, and the transmission assembly and the sliding drive assembly are disposed on the sliding assembly.

[0022] Furthermore, the sliding assembly includes a U-shaped tube and a sliding plate, wherein the U-shaped tube is slidably disposed in the pipe section and the flow channel section, and the sliding plate is fixedly connected to the U-shaped tube.

[0023] Furthermore, the transmission assembly includes a guide screw and a drive nut. The guide screw is fixed to the end clamp, and the drive nut is rotatably mounted on the sliding plate. The guide screw and the drive nut are threadedly engaged.

[0024] The sliding drive assembly can drive the drive nut to rotate, thereby adjusting the position of the U-tube in the heat exchange plate through threaded transmission, and thus controlling the number of heat exchange plates participating in heat exchange, thereby achieving the technical effect of matching different heat exchange paths to different heat exchange needs.

[0025] Furthermore, the sliding drive assembly includes a drive motor, a drive gear, and a driven gear. The drive motor is mounted on the sliding plate, the drive gear is mounted on the output shaft of the drive motor, and the driven gear is mounted on the drive nut. The drive gear and the driven gear mesh and transmit power to each other.

[0026] The beneficial effects achieved by the present invention using the above structure are as follows:

[0027] (1) There are several relatively independent chambers between the heat exchange plates, and the liquids of the primary network and the secondary network are alternately circulated in the above chambers, thereby achieving the technical purpose of heat exchange.

[0028] (2) Since the temperature in the primary water supply pipe remains constant, the temperature of the hot water delivered to the user can be kept stable by stabilizing the temperature difference between the primary and secondary water supply pipes.

[0029] (3) By monitoring the difference between the return water pipes of the primary and secondary networks, it is possible to get feedback on the current range of heating efficiency of the primary network.

[0030] (4) The two annular parts sense the temperature in the corresponding circulating water pipe in a non-contact manner. When the temperature difference between the two sides changes, the piston plate and the filling block will push the sliding control plate to slide, thereby realizing the sliding adjustment of the sliding controller.

[0031] (5) The sliding controller is a sliding controller with a certain stroke. Its type varies depending on the connected load. In this invention, the sliding controller connected to the solenoid valve can control the movement direction of the valve disc in the solenoid valve through its own sliding direction; the sliding controller connected to the indicator can control the light color or reading of the indicator through its own sliding position.

[0032] (6) The heat exchange plate and end plate can be positioned and locked by studs.

[0033] (7) The sliding drive assembly can drive the drive nut to rotate, thereby adjusting the position of the U-tube in the heat exchange plate through the form of thread transmission, thereby controlling the number of heat exchange plates participating in heat exchange, thus satisfying the technical effect of matching different heat exchange paths for different heat exchange needs. Attached Figure Description

[0034] Figure 1 This is a perspective view of a heating device based on a small temperature difference water circulation proposed in this invention;

[0035] Figure 2 This is a front view of a heating device based on a small temperature difference water circulation proposed in this invention;

[0036] Figure 3 for Figure 2 A cross-sectional view along section line AA;

[0037] Figure 4 for Figure 3 A cross-sectional view along the cutting line BB;

[0038] Figure 5 for Figure 4 Axonometric sectional view along the section line CC;

[0039] Figure 6 This is a schematic diagram of the exploded structure of a heating device based on a small temperature difference water circulation proposed in this invention.

[0040] Figure 7 for Figure 4 A magnified view of a section at point I;

[0041] Figure 8 for Figure 6 Enlarged view of a section at point II;

[0042] Figure 9 for Figure 5 Enlarged view of a section at point III;

[0043] Figure 10 for Figure 5 A magnified view of a section at point IV.

[0044] Among them, 1. Heat exchange assembly, 2. Return water differential sensing assembly, 3. Throttling control assembly, 4. Clamping assembly, 5. Sliding assembly, 6. Transmission assembly, 7. Sliding drive assembly, 11. Heat exchange plate, 12. End plate, 13. Circulating water pipe, 14. Solenoid valve, 21. Sensing chamber, 22. Piston plate, 23. Filling block, 31. Sliding control plate, 32. Sliding controller, 41. End clamp, 42. Stud, 43. Nut, 51. U-tube, 52. Sliding plate, 61. Guide screw, 62. Drive nut, 71. Drive motor, 72. Drive gear, 73. Driven gear, 111. Pipe section, 112. Flow channel section, 113. Guide hole, 211. Annular section, 212. Square section, 411. Bolt hole, 412. Pipe joint.

[0045] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] like Figures 1-10 As shown, the present invention proposes a heating device based on small temperature difference water circulation, including a heat exchange component 1, a return water end difference sensing component 2, a throttling control component 3 and a clamping component 4. The return water end difference sensing component 2 is disposed on the heat exchange component 1, the throttling control component 3 is disposed on the return water end difference sensing component 2, and the heat exchange component 1 is disposed in the clamping component 4.

[0049] The heat exchange assembly 1 includes heat exchange plates 11, end plates 12 and circulating water pipes 13. The heat exchange plates 11 are arranged in an array, and the end plates 12 are located at both ends of the heat exchange plates 11. The heat exchange plates 11 are provided with pipe sections 111 and flow channels 112. The circulating water pipes 13 are connected to the pipe sections 111 and flow channels 112.

[0050] There are several relatively independent chambers between the heat exchange plates 11, in which the liquids of the primary network and the secondary network are alternately circulated, thereby achieving the technical purpose of heat exchange.

[0051] The circulating water pipe 13 is specifically divided into the primary network's water supply pipe and return pipe, as well as the secondary network's water supply pipe and return pipe; the return water differential sensing component 2 and the throttling control component 3 are each provided with two sets, one set is located between the primary network and the secondary network's return pipe, and the other set is located between the primary network and the secondary network's water supply pipe.

[0052] Since the temperature in the primary water supply pipe remains constant, the temperature of the hot water delivered to users can be kept stable by stabilizing the temperature difference between the primary and secondary water supply pipes.

[0053] By monitoring the difference in return water between the primary and secondary networks, it is possible to get feedback on the current range of heating efficiency of the primary network.

[0054] The return water differential sensing assembly 2 includes a sensing cavity 21, a piston plate 22, and a filling block 23. The sensing cavity 21 is composed of a square part 212 and an annular part 211 symmetrically arranged at both ends. The sensing cavity 21 is sleeved on the circulating water pipe 13 through the annular part 211. The piston plate 22 is slidably disposed in the square part 212, and the filling block 23 is disposed on the inner side of the piston plate 22.

[0055] The two annular portions 211 sense the temperature inside the corresponding circulating water pipe 13 in a non-contact manner. When the temperature difference between the two sides changes, the piston plate 22 and the filling block 23 will push the sliding control plate 31 to slide, thereby realizing the sliding adjustment of the sliding controller 32.

[0056] The throttling control assembly 3 includes a sliding control plate 31 and a sliding controller 32. The sliding control plate 31 is slidably disposed in the square portion 212 and is located between the filling blocks 23. The sliding controller 32 is disposed outside the square portion 212.

[0057] The sliding controller 32 is a sliding controller with a certain stroke. Its type varies depending on the connected load. In this invention, the sliding controller 32 connected to the solenoid valve 14 can control the movement direction of the valve disc in the solenoid valve 14 through its own sliding direction; the sliding controller 32 connected to the indicator can control the light color or reading of the indicator through its own sliding position.

[0058] The heat exchange assembly 1 also includes a solenoid valve 14, which is located on the water supply pipe of the primary network. The solenoid valve 14 is controlled by one of the sliding controllers 32, and the other of the sliding controllers 32 is connected to an indicator.

[0059] The clamping assembly 4 includes an end clamping plate 41, a stud 42, and a nut 43. The end clamping plate 41 is provided with a bolt hole 411, and the heat exchange plate 11 is provided with a guide hole 113. The stud 42 passes through the guide hole 113 and the bolt hole 411. The nut 43 is located outside the end clamping plate 41 and is threadedly connected to the stud 42. The end clamping plate 41 is also provided with a pipe joint 412 opposite to the pipe section 111 and the flow channel section 112. The circulating water pipe 13 is clamped in the pipe joint 412.

[0060] The heat exchange plate 11 and the end plate 12 can be positioned and locked by the stud 42.

[0061] It also includes a sliding assembly 5, a transmission assembly 6 and a sliding drive assembly 7. The sliding assembly 5 is slidably disposed in the heat exchange assembly 1, and the transmission assembly 6 and the sliding drive assembly 7 are disposed on the sliding assembly 5.

[0062] The sliding assembly 5 includes a U-shaped tube 51 and a sliding plate 52. The U-shaped tube 51 is slidably disposed in the pipe section 111 and the flow channel section 112, and the sliding plate 52 is fixedly connected to the U-shaped tube 51.

[0063] The transmission assembly 6 includes a guide screw 61 and a drive nut 62. The guide screw 61 is fixed to the end clamp 41, and the drive nut 62 is rotatably mounted on the sliding plate 52. The guide screw 61 and the drive nut 62 are threaded together.

[0064] The sliding drive assembly 7 can drive the drive nut 62 to rotate, thereby adjusting the position of the U-shaped tube 51 in the heat exchange plate 11 through threaded transmission, and thus controlling the number of heat exchange plates 11 participating in heat exchange, thereby meeting the technical effect of matching different heat exchange paths for different heat exchange needs.

[0065] The sliding drive assembly 7 includes a drive motor 71, a drive gear 72, and a driven gear 73. The drive motor 71 is mounted on the sliding plate 52, the drive gear 72 is mounted on the output shaft of the drive motor 71, and the driven gear 73 is mounted on the drive nut 62. The drive gear 72 and the driven gear 73 mesh and transmit power.

[0066] like Figure 4 As shown, a and b represent the water supply and return of the primary network, respectively; c and d represent the water supply and return of the secondary network, respectively.

[0067] The return water end differential sensing component 2 located between b and d can sense the temperature difference between the two return water ends. The smaller the temperature difference between the two ends, the higher the heat utilization rate of the primary network.

[0068] The return water differential sensing component 2 located between a and c can sense the temperature difference between the two water supply ends. If the difference value during normal operation is used as a reference, if the primary network supplies too much hot water, the temperature in c will rise and the temperature difference between the two will decrease; if the primary network supplies too little hot water, the temperature in c will decrease and the temperature difference between the two will increase.

[0069] Since the temperature in a remains constant, the temperature in c can be kept stable by stabilizing the temperature difference between a and c.

[0070] By monitoring the temperature difference (terminal difference) between b and d, it is possible to determine whether the heat utilization rate of the primary network is within the optimal range.

[0071] In practical use, under stable operating conditions, the primary network has the highest water supply temperature, approximately 120-150 degrees Celsius; the secondary network has a relatively lower water supply temperature, approximately 45-50 degrees Celsius; and the return water temperature of both the primary and secondary networks is the lowest, approximately 40 degrees Celsius. The return water temperature of the secondary network is less than or equal to that of the primary network, and all of the above temperatures are stable.

[0072] When the heat deficit at the user end increases due to factors such as a drop in temperature, the supply and return water temperatures of the secondary network will decrease because the heat supply is stable.

[0073] In the initial state, the water supply temperature difference between the primary and secondary networks is constant. Therefore, by injecting more mass of gas into the annular portion 211 on the water supply side of the secondary network, the sliding control plate 31 at this position can be balanced in the middle position when the temperatures on both sides are unequal. When the water supply temperature of the secondary network decreases, since the water supply temperature of the primary network remains unchanged, the temperature difference on both sides increases, causing the pressure on both sides of the sliding control plate 31 to no longer be equal, and the sliding control plate 31 slides toward the side closer to the secondary network water supply pipe.

[0074] The sliding of the sliding control plate 31 increases the opening of the solenoid valve 14, thereby increasing the liquid flow rate in the primary network. As the flow rate increases, more heat is generated, and the temperature of the water supply side of the secondary network will also increase accordingly. As the temperature of the water supply side of the secondary network rises, the sliding control plate 31 will return to the middle position of the sliding controller 32, at which point the opening of the solenoid valve 14 will stop changing.

[0075] When the water supply temperature of the secondary network rises, the feedback and regulation process is the opposite of the above process. The opening degree of the solenoid valve 14 will gradually decrease until the water supply temperature of the secondary network recovers, at which point the opening degree of the solenoid valve 14 will stop changing.

[0076] Through the above-mentioned negative feedback regulation, the water temperature of the secondary network can be kept stable by adjusting the flow rate in the primary network, thereby ensuring that the water temperature delivered to the user meets the standards.

[0077] In addition to meeting user experience standards, it is also necessary to improve economic efficiency, which means increasing the utilization rate of heat transmitted by the primary network.

[0078] When the temperature on both sides of the sensing chamber 21 on the primary and secondary network return water pipes is the same, the sliding control plate 31 is in the middle position of the sliding controller 32. If the heat exchange is insufficient, the temperature of the primary network return water pipe will rise. At this time, the sliding control plate 31 will slide to one side. The greater the sliding range, the lower the utilization rate of the heat transferred by the primary network. The indicator and feedback can be given by the light color or pointer. If the utilization rate is too low, the position of the U-shaped tube 51 can be actively adjusted to increase the heat exchange area.

[0079] Under normal circumstances, with changes in day and night and temperature, users can anticipate changes in the heat deficit at the user end, and therefore can adjust the position of the U-shaped tube 51 in advance according to the plan. The adjustment principle is as follows:

[0080] The lower the temperature, the more heat the user needs, requiring an appropriate increase in the heat exchange area to ensure sufficient heat exchange; the opposite is true when the temperature is higher.

[0081] When adjusting the U-tube 51, simply start the drive motor 71. The drive nut 62 will rotate through the drive gear 72 and driven gear 73. The position of the sliding plate 52 will be changed through the threaded transmission of the guide screw 61 and the drive nut 62, thereby changing the position of the U-tube 51 in the heat exchange plate 11 and thus controlling the number of heat exchange plates 11 participating in heat exchange.

[0082] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0083] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A heating device based on small temperature difference water circulation, characterized in that: It includes a heat exchange assembly (1), a return water differential sensing assembly (2), a throttling control assembly (3), and a clamping assembly (4). The return water differential sensing assembly (2) is disposed on the heat exchange assembly (1), the throttling control assembly (3) is disposed on the return water differential sensing assembly (2), and the heat exchange assembly (1) is disposed in the clamping assembly (4). The heat exchange assembly (1) includes a heat exchange plate (11), an end plate (12), and a circulating water pipe (13). The heat exchange plates (11) are arranged in an array. The end plates (12) are located at both ends of the heat exchange plates (11). The heat exchange plates (11) are provided with a pipe section (111) and a flow channel section (112). The circulating water pipe (13) is connected to the pipe section (111) and the flow channel section (112). The return water differential sensing assembly (2) includes a sensing cavity (21), a piston plate (22), and a filling block (23). The sensing cavity (21) is composed of a square part (212) and an annular part (211) symmetrically arranged at both ends. The sensing cavity (21) is sleeved on the circulating water pipe (13) through the annular part (211). The piston plate (22) is slidably disposed in the square part (212). The filling block (23) is disposed on the inner side of the piston plate (22). It also includes a sliding assembly (5), a transmission assembly (6) and a sliding drive assembly (7), wherein the sliding assembly (5) is slidably disposed in the heat exchange assembly (1), and the transmission assembly (6) and the sliding drive assembly (7) are disposed on the sliding assembly (5); The sliding assembly (5) includes a U-shaped tube (51) and a sliding plate (52). The U-shaped tube (51) is slidably disposed in the pipe section (111) and the flow channel section (112), and the sliding plate (52) is fixedly connected to the U-shaped tube (51).

2. The heating equipment based on small temperature difference water circulation according to claim 1, characterized in that: The circulating water pipe (13) is specifically divided into a primary network water supply pipe and a secondary network water supply pipe and a secondary network water return pipe; the return water differential sensing component (2) and the throttling control component (3) are both provided in two sets, one set is located between the primary network and the secondary network water return pipe, and the other set is located between the primary network and the secondary network water supply pipe.

3. A heating device based on a small temperature difference water circulation according to claim 2, characterized in that: The throttling control assembly (3) includes a sliding control plate (31) and a sliding controller (32). The sliding control plate (31) is slidably disposed in the square portion (212) and is located between the filling blocks (23). The sliding controller (32) is disposed outside the square portion (212).

4. A heating device based on a small temperature difference water circulation according to claim 3, characterized in that: The heat exchange assembly (1) also includes a solenoid valve (14), which is located on the water supply pipe of the primary network. The solenoid valve (14) is controlled by one of the sliding controllers (32), and the other of the sliding controllers (32) is connected to an indicator.

5. A heating device based on a small temperature difference water circulation according to claim 4, characterized in that: The clamping assembly (4) includes an end clamp (41), a stud (42) and a nut (43). The end clamp (41) is provided with a bolt hole (411), and the heat exchange plate (11) is provided with a guide hole (113). The stud (42) passes through the guide hole (113) and the bolt hole (411). The nut (43) is located outside the end clamp (41) and is threadedly connected to the stud (42). The end clamp (41) is also provided with a pipe joint (412) opposite to the pipe section (111) and the flow channel section (112). The circulating water pipe (13) is clamped in the pipe joint (412).

6. A heating device based on a small temperature difference water circulation according to claim 5, characterized in that: The transmission assembly (6) includes a guide screw (61) and a drive nut (62). The guide screw (61) is fixed to the end clamp (41), and the drive nut (62) is rotatably mounted on the sliding plate (52). The guide screw (61) and the drive nut (62) are threaded together.

7. A heating device based on a small temperature difference water circulation according to claim 6, characterized in that: The sliding drive assembly (7) includes a drive motor (71), a drive gear (72), and a driven gear (73). The drive motor (71) is mounted on the sliding plate (52), the drive gear (72) is mounted on the output shaft of the drive motor (71), and the driven gear (73) is mounted on the drive nut (62). The drive gear (72) and the driven gear (73) mesh and transmit power.

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