Heating control method of electric heating system

Abstract

The invention provides a heating control method of an electric heating system, which comprises the following steps: detecting the outlet water temperature T1 of an electric heating unit of a first loop in real time, detecting the supply water temperature T2 and the return water temperature T3 of a second loop in real time, arranging a plurality of electric heating components which can be independently opened / closed in the electric heating unit, and presetting the outlet water temperature T4, the supply water temperature T5 and the return water temperature T6; during starting, T1 is compared with T4, T1 is made to be close to / equal to T4 by increasing or decreasing the number of started electric heating assemblies, and the stable water outlet temperature is achieved; when the outlet water temperature is stabilized near T4 or T4, T2 is compared with T5, T3 is compared with T6, if T2 is not close to or not equal to T5, and T3 is not close to or not equal to T6, the number of started electric heating assemblies is increased or decreased firstly, then the flow of a second loop is adjusted, T2 is made to be close to or equal to T5, T3 is made to be close to or equal to T6, and until T2 is stabilized near T5 or T5, and T3 is stabilized near T6 or T6; the control method is beneficial for efficiently achieving the purpose of constant-temperature heating.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, in particular to a heating control method for an electric heating system. Background Art

[0002] There is an electric heating system, which has two circuits. The first circuit is a heating circuit and the second circuit is a heating circuit. An electric heating unit is provided in the first circuit, and the medium in the first circuit is heated by the electric heating unit. A heat exchanger is provided between the first circuit and the second circuit. The heat exchanger flows through the medium and the heating liquid (usually water) of the second circuit, and the heating liquid is heated by the medium. The heated heating liquid is transported to various terminals (such as the user's home) to achieve the purpose of heating. It can be seen from the above structure and working principle that the electric heating system is relatively large, so how to efficiently achieve the purpose of constant temperature heating requires further research.

[0003] Therefore, this application will propose a heating control method for an electric heating system, which is conducive to achieving the purpose of constant temperature heating efficiently. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and propose a heating control method for an electric heating system, which is conducive to achieving the purpose of constant temperature heating in an efficient manner.

[0005] Compared with the existing technology, the present invention proposes a heating control method for an electric heating system. The electric heating system includes a first circuit and a second circuit. A first medium circulates in the first circuit, and a second medium circulates in the second circuit. The first medium exchanges heat with the second medium through a heat exchanger. The method is characterized in that the outlet water temperature T1 of the electric heating unit of the first circuit is detected in real time, and the supply water temperature T2 and return water temperature T3 of the second circuit are detected in real time. The electric heating unit is provided with a plurality of electric heating components that can be turned on / off individually, and the outlet water temperature T4, the supply water temperature T5, and the return water temperature T6 are preset.

[0006] When starting the machine, compare T1 with T4, and make T1 close to / equal to T4 by increasing or decreasing the number of electric heating components that are turned on, so as to achieve stable water outlet temperature.

[0007] When the outlet water temperature stabilizes at or near T4, compare T2 with T5, and T3 with T6. If T2 is not close to or equal to T5, and T3 is not close to or equal to T6, first increase or decrease the number of turned-on electric heating components, and then adjust the flow rate of the second circuit to make T2 close to / equal to T5, and make T3 close to / equal to T6, until T2 stabilizes at or near T5, and T3 stabilizes at or near T6.

[0008] After adopting the above structure, compared with the prior art, the present invention has the following advantages: The present disclosure achieves heating through improved control of multiple individually turned-on / off electric heating components. Furthermore, the entire control method carefully considers both startup and post-startup situations. By increasing or decreasing the number of turned-on electric heating components during startup to make T1 close to / equal to T4, the outlet water temperature is stabilized. The turned-on electric heating components are then coordinated based on the supply water temperature T5 and the return water temperature T6, combined with the adjustment of the flow rate of the second circuit, thereby facilitating efficient constant-temperature heating. Furthermore, as can be seen from the foregoing, the control of the present disclosure is more detailed, and the individually turned-on / off electric heating components facilitate more accurate temperature control, thereby facilitating energy conservation without wasting electricity.

[0009] In some embodiments, when T2 is less than T5, the number of electric heating components turned on is first increased, and then the flow rate of the second circuit is reduced, so that T2 is quickly increased to T5.

[0010] In some embodiments, before reducing the flow of the second circuit, it is first determined whether the maximum number of electric heating components has been turned on. If the maximum number of electric heating components has been turned on, the flow of the second circuit is reduced; otherwise, the number of turned-on electric heating components continues to increase without reducing the flow of the second circuit.

[0011] In some embodiments, when the flow rate of the second circuit is reduced, it is determined whether the minimum flow rate has been reached. If the minimum flow rate has been reached but the condition that T2 is close to / equal to T5 is still not met, an alarm is issued.

[0012] In some embodiments, when T2 is greater than T5, the number of electric heating components turned on is first reduced until all electric heating components are turned off without relying on the flow rate of the second circuit.

[0013] In some embodiments, it is first determined whether T2 is close to / equal to T5. If so, it is further determined whether T3 is close to / equal to T6. If not, control is still determined based on whether T2 is close to / equal to T5.

[0014] In some embodiments, when T2 is close to / equal to T5, and T3 is less than T6, the number of turned-on electric heating components is first increased, and it is determined whether the maximum number of turned-on electric heating components has been reached. If so, the flow rate of the second circuit is reduced; otherwise, the number of turned-on electric heating components continues to increase without reducing the flow rate of the second circuit.

[0015] In some embodiments, when T2 is close to / equal to T5 and T3 is greater than T6, the number of electric heating components turned on is first reduced until all electric heating components are turned off without relying on the flow rate of the second circuit.

[0016] In some embodiments, the electric heating unit adopts a plate-type heat exchanger, which includes a plate-type heat exchange plate, a first fixed template, a second fixed template and a plate-type heating element. The multiple plate-type heat exchange plates are sandwiched between the first fixed template and the second fixed template, and the plate-type heating element is sandwiched between two adjacent plate-type heat exchange plates. One side of the plate-type heating element is fitted and connected to the plate-type heat exchange plate on the adjacent side, and the other side of the plate-type heating element is fitted and connected to the plate-type heat exchange plate on the other adjacent side. The plate-type heating element heats the two adjacent plate-type heat exchange plates at the same time.

[0017] In some embodiments, the sheet heat exchange plate includes a sheet circulation slot plate and a first sheet cover plate, the sheet circulation slot plate is provided with a first circulation slot on the front side, the first sheet cover plate is stacked and connected with the front side of the sheet circulation slot plate so that the first sheet cover plate covers the first circulation slot to form a first flow channel, and the sheet heating element located on the front side of the sheet circulation slot plate is fittedly connected to the outer side of the first sheet cover plate and covers the area of ​​the outer side corresponding to the first flow channel.

[0018] In some embodiments, the sheet heat exchange plate also includes a second sheet cover plate, and the sheet circulation slot plate is provided with a second circulation slot on the rear side. The second sheet cover plate is stacked and connected with the rear side of the sheet circulation slot plate so that the second sheet cover plate covers the second circulation slot to form a second flow channel. The sheet heating element located on the rear side of the sheet circulation slot plate is fittedly connected to the outer side of the second sheet cover plate and covers the area of ​​the outer side corresponding to the second flow channel.

[0019] In some embodiments, two adjacent sheet-shaped heat exchange plates share a sheet-shaped cover plate.

[0020] In some embodiments, the first flow grooves and the second flow grooves are adjacently and alternately arranged in sequence, and adjacent first flow grooves and second flow grooves share adjacent side portions.

[0021] In some embodiments, the sheet flow slot plate is provided with an inlet and an outlet for the first medium on the front side and the rear side of the sheet flow slot plate at one end in the length direction, respectively. A first through hole is provided at the inlet, and the first medium enters the first flow slot through the first through hole and the inlet on the front side, and the first medium enters the second flow slot through the first through hole and the inlet on the rear side. A second through hole is provided at the outlet, and the first medium flows out of the first flow slot through the outlet on the front side and the second through hole, and the first medium flows out of the second flow slot through the outlet on the rear side and the second through hole. When the first fixed template, multiple sheet heat exchange plates and the second fixed template are stacked and connected in sequence, the first through hole and the second through hole penetrate each sheet heat exchange plate and the first fixed template and / or the second fixed template along the thickness direction of the plate-to-plate heat exchanger.

[0022] In some embodiments, the sheet heat exchange plate, the sheet heating element, the first fixed template and the second fixed template are all arranged vertically to form a vertical plate-to-plate heat exchanger, and also include a base, which is connected to the lower end of the plate-to-plate heat exchanger. The base is used to vertically install the plate-to-plate heat exchanger, and the first through hole and the second through hole are set at the lower end of the plate-to-plate heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention discloses a control flow diagram of a heating control method for an electric heating system.

[0024] Figure 2 This is a front and side perspective diagram of a plate heat exchanger disclosed in the present invention.

[0025] Figure 3 This is a schematic diagram of the rear side of a plate-type heat exchanger disclosed in the present invention.

[0026] Figure 4 This is a front and side perspective diagram of a plate-type heat exchanger disclosed in the present invention after the first fixed template is removed.

[0027] Figure 5 for Figure 4 On this basis, the first sheet cover is further removed to show the front side stereoscopic diagram of the sheet flow channel plate.

[0028] Figure 6 for Figure 4 On this basis, the front sheet heat exchange plate is further removed to show the front side stereoscopic diagram of the sheet heating element sandwiched therein.

[0029] Figure 7 This is a three-dimensional schematic diagram of the rear side of a sheet-shaped heat exchange plate disclosed in the present invention after being bonded and connected to a sheet-shaped heating element.

[0030] Figure 8 This is a front and side perspective diagram of a sheet-shaped heat exchange plate disclosed in the present invention after being bonded and connected to a sheet-shaped heating element.

[0031] Figure 9 The figure is a front and side perspective diagram of a sheet-like flow channel plate disclosed in the present invention.

[0032] Figure 10 The figure is a schematic diagram of the rear side of a sheet-like flow channel plate disclosed in the present invention.

[0033] Figure 11 The figure is a three-dimensional schematic diagram of the inner side surface of a first sheet-shaped cover plate disclosed in the present invention.

[0034] Figure 12 The figure is a three-dimensional schematic diagram of a sealing ring disclosed in the present invention.

[0035] Figure 13This is a front view of the front side of a sheet-like flow channel plate disclosed in the present invention.

[0036] Figure 14 It is the AA section view.

[0037] Explanation of the reference numerals: 1-sheet circulation groove plate, 2-first sheet cover plate, 3-first circulation groove, 4-sheet heating element, 5-second sheet cover plate, 6-second circulation groove, 7-side, 8-inlet, 9-outlet, 10-first through hole, 11-second through hole, 12-sheet heat exchange plate, 13-first fixed template, 14-second fixed template, 15-base, 16-positioning groove, 17-bolt. DETAILED DESCRIPTION

[0038] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0039] It should be understood by those skilled in the art that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0040] like Figures 1 to 14 As shown, the present disclosure proposes a heating control method for an electric heating system, such as Figure 1 The figure shows a control flow diagram of the heating control method of the electric heating system, which can clearly show the entire control process.

[0041] Specifically, the electric heating system comprises a first circuit and a second circuit. The first circuit is Figure 1 The first network mentioned in the second circuit is Figure 1 In the two networks mentioned above, a first medium circulates in the first circuit, and a second medium circulates in the second circuit. The first medium exchanges heat with the second medium through a heat exchanger. The first medium and the second medium can be water, or other liquids, gases, gas-liquid mixtures, etc. The "water" below refers to the medium, not just the water component.

[0042] When the power is turned on, at least the outlet water temperature T1 of the electric heating unit of the first circuit is detected in real time. Of course, the supply water temperature T2 and the return water temperature T3 of the second circuit can also be detected synchronously in real time. The electric heating unit is provided with multiple electric heating components that can be turned on / off separately. In order to achieve the control target, the heating control method of the electric heating system presets the outlet water temperature T4, the preset supply water temperature T5 and the preset return water temperature T6 in advance.

[0043] When the machine is turned on, T1 is compared with T4, and T1 is made close to / equal to T4 by increasing or decreasing the number of electric heating components turned on, that is, T1 reaches T4, so that the outlet water temperature is stable. It can be seen that the present disclosure does not rely on the flow rate of the second circuit when the machine is turned on, but rather maintains the flow rate to achieve stable water output; When the outlet water temperature stabilizes at or near T4, compare T2 with T5, and T3 with T6. If T2 is not close to or equal to T5, and T3 is not close to or equal to T6, first increase or decrease the number of turned-on electric heating components, and then adjust the flow rate of the second circuit to make T2 close to / equal to T5, and make T3 close to / equal to T6, until T2 stabilizes at or near T5, and T3 stabilizes at or near T6.

[0044] The purpose of setting the "increase and decrease" control to turn on the number of electric heating components is also that, since the number of user ends will change, the heating is a dynamic change, so how to adapt to facilitate the efficient realization of the constant temperature heating purpose needs to be solved. As shown above, the present disclosure takes into account this dynamic change.

[0045] like Figure 1 As shown, further, when T2 is less than T5, the number of electric heating components turned on is first increased, and then the flow rate of the second circuit is reduced, so that T2 is quickly increased to T5.

[0046] like Figure 1 As shown, before reducing the flow rate of the second circuit, it is first determined whether the maximum number of electric heating components has been activated. If the maximum number of electric heating components has been activated, the flow rate of the second circuit is reduced. Otherwise, the number of activated electric heating components continues to increase without reducing the flow rate of the second circuit. This helps maintain the water pressure at the user end to maintain the stability and accessibility of the heat exchange at the user end, thereby making the user end more comfortable. On the other hand, it allows the first circuit to quickly adjust the temperature without slowing down the control rate of the first circuit by determining the flow rate, which is conducive to maintaining a constant temperature. This is because the definition of constant temperature lies in the temperature fluctuation in the time dimension. Therefore, increasing the control rate is conducive to maintaining a constant temperature.

[0047] like Figure 1As shown, when the flow rate of the second circuit is reduced, it is determined whether the minimum flow rate has been reached. If the minimum flow rate has been reached but the condition of T2 being close to / equal to T5 is still not met, an alarm is issued. This helps to ensure the effectiveness of the entire control method. The alarm can help to promptly resolve existing leaks or other faults that prevent the temperature from being reached, rather than causing the control method to run idle, resulting in inefficiency or a loss of user experience.

[0048] like Figure 1 As shown, when T2 is greater than T5, the number of active electric heating components is first reduced, until all are turned off, regardless of the flow rate in the second circuit. This is a detail that, on the one hand, helps save energy, and on the other hand, helps maintain the stability and accessibility of heat exchange at the user end, thereby improving user comfort.

[0049] like Figure 1 Specifically, the system first determines whether T2 is close to or equal to T5. If so, it then determines whether T3 is close to or equal to T6. If not, control is still based on whether T2 is close to or equal to T5. This prioritizes achieving the supply water temperature T5, ensuring the system operates at a relatively efficient state. The return water temperature T6 is then raised, maintaining a relatively constant temperature throughout the system.

[0050] like Figure 1 As shown, further, when T2 approaches / equals T5, and T3 is less than T6, the number of activated electric heating components is first increased, and a determination is made as to whether the maximum number of activated electric heating components has been reached. If so, the flow rate of the second circuit is reduced. Otherwise, the number of activated electric heating components is continued to increase without reducing the flow rate of the second circuit. This consideration is also intended to maintain heat exchange stability and accessibility at the user end, thereby providing greater user comfort.

[0051] like Figure 1 As shown, when T2 approaches / equals T5, and T3 is greater than T6, the number of activated electric heating components is first reduced, until all are turned off, without relying on the flow rate of the second circuit. This configuration not only saves energy but also helps maintain heat exchange stability and accessibility at the user end, thereby improving user comfort.

[0052] To further enhance the performance of the present disclosure, the present disclosure also proposes a plate-and-fin heat exchanger designed with a sheet-shaped heating element sandwiched between two adjacent sheet-shaped heat exchange plates. The medium flowing through the sheet-shaped heat exchange plates can then quickly absorb heat conducted from the sheet-shaped heating element. This not only increases the heat exchange area, but also, due to the sheet-shaped design, the heat conduction distance is very short, which is beneficial for heat exchange efficiency, thereby improving energy efficiency. Furthermore, the present disclosure has the advantage of rapid temperature rise. Such a plate-and-fin heat exchanger enables more efficient and precise temperature control of the first medium in the first circuit, making it suitable for use in the heating control method of an electric heating system disclosed herein, further improving the control rate and facilitating constant temperature.

[0053] like Figures 2 to 14 As shown, a plate-type heat exchanger disclosed in the present invention includes a sheet heat exchange plate 12, a first fixed template and a second fixed template 14, and the multiple sheet heat exchange plates 12 are sandwiched between the first fixed template and the second fixed template 14. It also includes a sheet heating element 4, and the sheet heating element 4 is sandwiched between two adjacent sheet heat exchange plates 12. One side of the sheet heating element 4 is fitted and connected to the sheet heat exchange plate 12 on the adjacent side, and the other side of the sheet heating element 4 is fitted and connected to the sheet heat exchange plate 12 on the other adjacent side. The sheet heating element 4 heats the two adjacent sheet heat exchange plates 12 at the same time.

[0054] In some embodiments, the sheet heating element 4 is a flexible sheet heating element 4. In this way, the sheet heating element 4 can be better fitted and connected between two adjacent sheet heat exchange plates 12, and the fit is better. For example, the sheet heating element 4 is a flexible thin-film electric heating device. The flexible thin-film electric heating device can adopt existing technology, such as a heating plate, which is a soft and flexible thin-film electric heating device. The heating plate is formed by evenly distributing a foam-shaped or filamentous metal heating element between glass fiber cloth coated with high-temperature resistant silicone rubber, and then molding it at high temperature. It is thin and light in weight, heats up quickly when powered on, and has a fast temperature rise. It has the characteristics of large heating surface, uniform heating, weather resistance, corrosion resistance, environmental protection, flame retardancy, easy installation, long life, and high insulation strength. Therefore, the heating plate is also called "silicone rubber heating plate" because its main raw material is silicone rubber.

[0055] It should be pointed out that the sheet heating element 4 is not limited to any specific structure. Any sheet heating element 4 that is suitable for the sheet can be used in this patent. For example, the sheet heating element 4 can be a flexible alloy heating wire or a thick film heating sheet.

[0056] In some embodiments, as Figures 7 to 13As shown, the present disclosure proposes a sheet heat exchange plate, which includes a sheet flow slot plate 1 and a first sheet cover plate 2. The sheet flow slot plate 1 is provided with a first flow slot 3 on the front side. The first sheet cover plate 2 is stacked and connected with the front side of the sheet flow slot plate 1 so that the first sheet cover plate 2 covers the first flow slot 3 to form a first flow channel. The sheet heating element 4 located on the front side of the sheet flow slot plate 1 is fitted and connected to the outer side of the first sheet cover plate 2 and covers the area of ​​the outer side corresponding to the first flow channel.

[0057] In this way, the present invention discloses a technical solution by designing a sheet-like heating element 4 that is fitted and connected to the outer side surface of the first sheet-like cover plate 2 and covers the area of ​​the outer side surface corresponding to the first flow channel, and the first sheet-like cover plate 2 is stacked and connected with the front side surface of the sheet-like circulation slot plate 1 so that the first sheet-like cover plate 2 covers the first circulation slot 3 to form the first flow channel, thereby realizing the sheet-like heating solution. Since there is a huge covering area between the sheet-like heating element 4 and the outer side surface of the first sheet-like cover plate 2, and the inner side surface of the first sheet-like cover plate 2 is the first circulation slot 3, the medium flowing through the first circulation slot 3 can quickly absorb heat from the heat conducted from the first sheet-like cover plate 2. Not only is the heat exchange area large, but the distance is also very close, so it is beneficial to the heat exchange efficiency, thereby further improving energy efficiency.

[0058] In this example, the sheet flow channel plate 1, the first sheet cover plate 2, the sheet heating element 4, the first fixed template and the second fixed template 14 all adopt a rectangular sheet structure, and the first flow channel 3 is a labyrinth groove extending in an S shape along the length direction of the sheet flow channel plate 1.

[0059] like Figure 7 As shown, the sheet-like heating element 4 has a large area and completely covers the area of ​​the first sheet-like cover plate 2 corresponding to the first flow channel.

[0060] In some embodiments, as Figure 6 、 7 As shown in Figures 9 and 10, the sheet-like heat exchange plate 12 also includes a second sheet-like cover plate 5. The sheet-like flow channel plate 1 has a second flow channel 6 disposed on its rear side. The second sheet-like cover plate 5 is stacked and connected to the rear side of the sheet-like flow channel plate 1, so that the second sheet-like cover plate 5 covers the second flow channel 6, forming a second flow channel. The sheet-like heating element 4 located on the rear side of the sheet-like flow channel plate 1 is attached to the outer side of the second sheet-like cover plate 5 and covers the area of ​​the outer side corresponding to the second flow channel. The second sheet-like cover plate 5 is also rectangular. The provision of the second flow channel thus facilitates increasing the flow rate of the lifting medium.

[0061] Furthermore, in order to make it thinner, two adjacent sheet-like heat exchange plates 12 share a sheet-like cover plate, that is, the shared sheet-like cover plate serves as the second sheet-like cover plate 5 for the adjacent front sheet-like heat exchange plates 12, and serves as the first sheet-like cover plate 2 for the adjacent rear sheet-like heat exchange plates 12.

[0062] In some embodiments, as Figure 13 As shown, the first flow grooves 3 and the second flow grooves 6 are arranged alternately in adjacent order, and adjacent first flow grooves 3 and second flow grooves 6 share adjacent side portions 7. This, on the one hand, places the first flow grooves 3 and second flow grooves 6 close together, creating a compact structure that facilitates heat exchange. On the other hand, it facilitates manufacturing the first flow grooves 3 and second flow grooves 6 to be roughly flush along the front-to-back direction of the sheet-like flow groove plate 1, thereby facilitating thinning. Thinning also facilitates the sheet-like heating element 4 to better and simultaneously heat the media in the first and second flow channels.

[0063] In order to improve heat exchange, Figure 9 As shown, the second flow channel 6 is also configured as a labyrinth groove extending in an S-shape along the length direction of the sheet-like flow channel plate 1 .

[0064] In some embodiments, as Figure 8 、 9 As shown in FIG. 13 , the sheet-like flow channel plate 1 is provided with a medium inlet 8 and outlet 9 at one end in its longitudinal direction, respectively, on the front side and the rear side of the sheet-like flow channel plate 1. This is conducive to extending the first flow channel and the second flow channel.

[0065] like Figure 1 、 2 As shown in Figures 3, 4, 5, 6, 7, 8, 9, and 13, a first through hole 10 is provided at the inlet 8 of the sheet flow slot plate 1, and the medium enters the first flow slot 3 through the first through hole 10 and the inlet 8 on the front side, and enters the second flow slot 6 through the first through hole 10 and the inlet 8 on the rear side. A second through hole 11 is provided at the outlet 9 of the sheet flow slot plate 1, and the medium flows out of the first flow slot 3 through the outlet 9 on the front side and the second through hole 11, and flows out of the second flow slot 6 through the outlet 9 on the rear side and the second through hole 11. When the first fixed template, multiple sheet heat exchange plates 12 and the second fixed template 14 are stacked and connected in sequence, the first through hole 10 and the second through hole 11 penetrate each sheet heat exchange plate 12 and the first fixed template and / or the second fixed template 14 along the thickness direction of the heating control method of the electric heating system. In this way, on the one hand, the structure is simple and compact, and on the other hand, it is convenient to assemble to form the medium inlet pipe and the medium outlet pipe, that is, the first fixed template, each sheet heat exchange plate 12 and the second fixed template 14 are stacked and connected in sequence to form the first through hole 10 and the second through hole 11.

[0066] In this example, the first through hole 10 and the second through hole 11 pass through each sheet-like heat exchange plate 12 and the first fixed template along the thickness direction of the heating control method of the electric heating system, so that the second fixed template 14 serves as the bottom of the first through hole 10 and the second through hole 11, thereby further simplifying the structure.

[0067] In order to guide the medium into the sheet flow slot plate 1 through the first through hole 10 and the inlet 8, and similarly, to guide the medium out of the sheet flow slot plate 1 through the outlet 9 and the second through hole 11, a sealing ring is provided between the first sheet cover plate 2 and the front side of the sheet flow slot plate 1. Figure 11 The figure shows a sealing ring, which is designed to be open on the side of the first through hole 10 facing the inlet 8 and the side of the second through hole 11 facing the outlet 9, so as to guide the medium into the sheet flow slot plate 1 through the first through hole 10 and the inlet 8. Similarly, in order to guide the medium to flow out of the sheet flow slot plate 1 through the outlet 9 and the second through hole 11.

[0068] In order to better prevent leakage, such as Figure 11 The sealing ring shown is also extended along the periphery of the first flow channel. Similarly, the second flow channel can also be provided with the sealing ring.

[0069] In some embodiments, as Figure 1 、 2 As shown in Figures 3, 4, and 5, the sheet-like heat exchange plate 12, the sheet-like heating element 4, the first fixed template, and the second fixed template 14 are all arranged vertically to form a vertical heating control method for an electric heating system. The base 14 is also included. The base 14 is connected to the lower end of the heating control method for an electric heating system. The base 14 is used to vertically install the heating control method for an electric heating system, and the lower end of the heating control method for an electric heating system is provided with the first through hole 10 and the second through hole 11. In this way, the structure is more compact. In addition, it is convenient to connect the pipeline to the side close to the base 14, thereby preventing the pipeline from being in a high suspended state, thereby facilitating the optimization of the pipeline layout. The pipeline includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the first through hole 10, and the outlet pipe is connected to the second through hole 11.

[0070] In some embodiments, as Figure 3 、 4 As shown in Figures 6 and 7, in order to stack and assemble the sheet heat exchange plates 12 more accurately, positioning grooves 16 are provided at the upper and lower ends of the sheet heat exchange plates 12. Positioning columns are inserted into the positioning grooves 16 to enable the sheet heat exchange plates 12 to be stacked and assembled more accurately. The compression and fixation rely on bolts 17 to connect and fix the first fixed template and the second fixed template 14, so that the first fixed template and the second fixed template 14 are used to clamp and fix the sheet heat exchange plates 12, and at the same time, the sheet heating element 4 is compressed and fixed.

[0071] It should be pointed out that, in the present disclosure, it is not required that a sheet heating element 4 be sandwiched between every two adjacent sheet heat exchange plates 12 , and the sheet heating elements 4 can be flexibly increased or decreased according to the need to increase or decrease the heating power.

[0072] When understanding the present disclosure, if necessary, the above structure can refer to other embodiments / appendices. Figure 1And understand, no further elaboration here.

[0073] The above description is merely an illustrative embodiment of the present invention, and therefore any equivalent changes or modifications made according to the structure, features and principles described in the patent protection scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A heating control method for an electric heating system, wherein the electric heating system comprises a first circuit and a second circuit, wherein a first medium circulates in the first circuit and a second medium circulates in the second circuit, and the first medium exchanges heat with the second medium through a heat exchanger, wherein: Real-time detection of the outlet water temperature T1 of the electric heating unit of the first circuit, and real-time detection of the supply water temperature T2 and return water temperature T3 of the second circuit. The electric heating unit is equipped with multiple electric heating components that can be turned on / off separately, with preset outlet water temperature T4, preset supply water temperature T5, and preset return water temperature T6; When starting the machine, compare T1 with T4 and make T1 close to / equal to T4 by increasing or decreasing the number of electric heating components to achieve stable water outlet temperature. When the outlet water temperature stabilizes at or near T4, compare T2 with T5, and T3 with T6. If T2 is not close to or equal to T5, and T3 is not close to or equal to T6, first increase or decrease the number of turned-on electric heating components, and then adjust the flow rate of the second circuit to make T2 close to / equal to T5, and make T3 close to / equal to T6, until T2 stabilizes at or near T5, and T3 stabilizes at or near T6.

2. The heating control method of the electric heating system according to claim 1, characterized in that: When T2 is less than T5, first increase the number of electric heating components that are turned on, and then reduce the flow rate of the second circuit, so that T2 quickly rises to T5.

3. The heating control method of the electric heating system according to claim 2, characterized in that: Before reducing the flow of the second circuit, first determine whether the maximum number of electric heating components has been turned on. If the maximum number of electric heating components has been turned on, reduce the flow of the second circuit; otherwise, continue to increase the number of turned-on electric heating components without reducing the flow of the second circuit.

4. The heating control method of the electric heating system according to claim 3, characterized in that: When the flow rate of the second circuit is reduced, it is determined whether the minimum flow rate has been reached. If the minimum flow rate has been reached but the condition that T2 is close to / equal to T5 is still not met, an alarm is issued.

5. The heating control method of the electric heating system according to claim 1, wherein: When T2 is greater than T5, the number of the electric heating components turned on is first reduced until all the electric heating components are turned off without relying on the flow of the second circuit.

6. The heating control method of the electric heating system according to claim 1, 2, 3, 4 or 5, characterized in that: First, determine whether T2 is close to / equal to T5. If so, further determine whether T3 is close to / equal to T6. If not, control is still determined based on the condition of whether T2 is close to / equal to T5.

7. The heating control method of the electric heating system according to claim 6, characterized in that: When T2 is close to / equal to T5, and T3 is less than T6, the number of turned-on electric heating components is first increased, and it is determined whether the maximum number of turned-on electric heating components has been reached. If so, the flow rate of the second circuit is reduced; otherwise, the number of turned-on electric heating components continues to increase without reducing the flow rate of the second circuit.

8. The heating control method of the electric heating system according to claim 6, wherein: When T2 is close to / equal to T5, and T3 is greater than T6, the number of the turned-on electric heating components is first reduced until all the electric heating components are turned off without relying on the flow of the second circuit.

9. The heating control method of the electric heating system according to claim 1, wherein: The electric heating unit adopts a plate-type heat exchanger, which includes a plate-type heat exchange plate (12), a first fixed template (13), a second fixed template (14) and a plate-type heating element (4). The plurality of plate-type heat exchange plates (12) are sandwiched between the first fixed template (13) and the second fixed template (14), and the plate-type heating element (4) is sandwiched between two adjacent plate-type heat exchange plates (12). One side of the plate-type heating element (4) is bonded to the plate-type heat exchange plate (12) on the adjacent side, and the other side of the plate-type heating element (4) is bonded to the plate-type heat exchange plate (12) on the adjacent side. The plate-type heating element (4) heats the two adjacent plate-type heat exchange plates (12) at the same time.

10. The heating control method of the electric heating system according to claim 9, characterized in that: The sheet heat exchange plate (12) comprises a sheet flow slot plate (1) and a first sheet cover plate (2); the sheet flow slot plate (1) is provided with a first flow slot (3) on the front side; the first sheet cover plate (2) is stacked and connected with the front side of the sheet flow slot plate (1) so that the first sheet cover plate (2) covers the first flow slot (3) to form a first flow channel; and the sheet heating element (4) located on the front side of the sheet flow slot plate (1) is fitted and connected to the outer side of the first sheet cover plate (2) and covers the area of ​​the outer side corresponding to the first flow channel.

11. The heating control method of the electric heating system according to claim 10, characterized in that: The sheet heat exchange plate (12) further includes a second sheet cover plate (5), a second flow groove (6) is provided on the rear side of the sheet flow groove plate (1), the second sheet cover plate (5) is stacked and connected with the rear side of the sheet flow groove plate (1) so that the second sheet cover plate (5) covers the second flow groove (6) to form a second flow channel, and the sheet heating element (4) located on the rear side of the sheet flow groove plate (1) is fitted and connected to the outer side of the second sheet cover plate (5) and covers the area of ​​the outer side corresponding to the second flow channel.

12. The heating control method of the electric heating system according to claim 11, wherein: Two adjacent sheet-shaped heat exchange plates (12) share a sheet-shaped cover plate.

13. The heating control method of the electric heating system according to claim 11, wherein: The first circulation grooves (3) and the second circulation grooves (6) are arranged adjacently and alternately in sequence, and adjacent first circulation grooves (3) and second circulation grooves (6) share adjacent side portions (7).

14. The heating control method of the electric heating system according to claim 11, wherein: The sheet-shaped flow slot plate (1) is provided with an inlet (8) and an outlet (9) for a first medium on the front side and the rear side of the sheet-shaped flow slot plate (1) at one end in the longitudinal direction thereof, and a first through hole (10) is provided at the inlet (8). The first medium enters the first flow slot (3) through the first through hole (10) and the inlet (8) on the front side. The first medium enters the second flow slot (6) through the first through hole (10) and the inlet (8) on the rear side. A second through hole (11) is provided at the outlet (9). The first medium enters the second flow slot (6) through the first through hole (11) on the front side. The outlet (9) and the second through hole (11) flow out of the first circulation groove (3), and the first medium flows out of the second circulation groove (6) through the outlet (9) and the second through hole (11) on the rear side. When the first fixed template (13), the plurality of sheet-shaped heat exchange plates (12) and the second fixed template (14) are sequentially stacked and connected, the first through hole (10) and the second through hole (11) penetrate each sheet-shaped heat exchange plate (12) and penetrate the first fixed template (13) and / or the second fixed template (14) along the thickness direction of the plate-shaped heat exchanger.

15. The heating control method of the electric heating system according to claim 14, characterized in that: The sheet heat exchange plate (12), the sheet heating element (4), the first fixed template (13) and the second fixed template (14) are all arranged vertically to form a vertical plate-type heat exchanger, and also include a base (14), which is connected to the lower end of the plate-type heat exchanger. The base (14) is used to vertically install the plate-type heat exchanger, and the lower end of the plate-type heat exchanger is provided with the first through hole (10) and the second through hole (11).

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