Vacuum heating device and vacuum heating system with variable mode

Abstract

The utility model provides a kind of vacuum heating device and vacuum heating system of variable mode, applied to vacuum heating system, it is related to heating control technical field. Among them, the device includes: first switching circuit, second switching circuit, third switching circuit and fourth switching circuit;First switching circuit is connected with the two ends of first heating module;Second switching circuit is connected with the two ends of second heating module;Third switching circuit is connected with the two ends of third heating module;Fourth switching circuit includes three fourth controllable switching elements, and the output end of three fourth controllable switching elements is connected with three heating modules respectively;Three heating modules are sequentially connected by three controllable air switching elements between;In control circuit, integrated subarea control circuit and whole area control circuit, can select suitable control mode according to different needs, realize the quick switching of control mode, greatly improve user experience.

Description

Technical Field

[0001] This utility model relates to the field of heating control technology, and in particular to a vacuum heating device and vacuum heating system with variable modes. Background Technology

[0002] For heating modules in vacuum heating systems, existing heating control methods are generally either whole-area control or single-area control. Whole-area control uniformly controls the working status of multiple heating modules, achieving synchronous temperature adjustment of the area, but this mode lacks zonal response capability; zonal control can achieve precise temperature control of each zone, and although its local adjustment capability is strong, it is difficult to achieve synchronous control when the entire area needs to be heated simultaneously, resulting in a poor user experience. Utility Model Content

[0003] The purpose of this invention is to provide a vacuum heating device and vacuum heating system with variable modes. The control circuit integrates a zone control circuit and a whole zone control circuit, which can select the appropriate control mode according to different needs and realize the rapid switching of control modes, greatly improving the user experience.

[0004] In a first aspect, this utility model provides a vacuum heating device with variable mode, which is applied to a vacuum heating system. The device includes: a first switching circuit, a second switching circuit, a third switching circuit and a fourth switching circuit.

[0005] The first switching circuit includes two first controllable switching elements. The input terminals of the two first controllable switching elements are respectively connected to the first phase and the second phase of the three-phase AC power supply, and the output terminals of the two first controllable switching elements are respectively connected to the two ends of the first heating module.

[0006] The second switching circuit includes two second controllable switching elements. The input terminals of the two second controllable switching elements are respectively connected to the second phase and the third phase of the three-phase AC power supply, and the output terminals of the two second controllable switching elements are respectively connected to the two ends of the second heating module.

[0007] The third switching circuit includes two third controllable switching elements. The input terminals of the two third controllable switching elements are respectively connected to the third phase and the first phase of the three-phase AC power supply, and the output terminals of the two third controllable switching elements are respectively connected to the two ends of the third heating module.

[0008] The fourth switching circuit includes three fourth controllable switching elements. The input terminals of the three fourth controllable switching elements are respectively connected to the first phase, second phase, and third phase of the three-phase AC power supply. The first output terminal of the fourth controllable switching element is connected to the input terminals of the first output branch and the second output branch, respectively. The second output terminal of the fourth controllable switching element is connected to the input terminals of the third output branch and the fourth output branch, respectively. The third output terminal of the fourth controllable switching element is connected to the input terminals of the fifth output branch and the sixth output branch, respectively. The output terminals of the second and third output branches are respectively connected to the two ends of the first heating module. The output terminals of the fourth and fifth output branches are respectively connected to the two ends of the second heating module. The output terminal of the sixth output branch and the output terminal of the first output branch are respectively connected to the two ends of the third heating module.

[0009] The second end of the first heating module is connected to the first end of the second heating module through a fifth controllable switch element, the second end of the second heating module is connected to the first end of the third heating module through a sixth controllable switch element, and the second end of the third heating module is connected to the first end of the first heating module through a seventh controllable switch element.

[0010] In some preferred embodiments of this utility model, the first switching circuit further includes: a first single-phase power regulator; the output terminal of the first controllable switching element connected to the first phase of the three-phase AC power is connected to the input terminal of the first single-phase power regulator;

[0011] The second switching circuit also includes: a second single-phase power regulator; the output terminal of the second controllable switching element connected to the second phase of the three-phase AC power and the input terminal of the second single-phase power regulator are connected.

[0012] The third switching circuit also includes: a third single-phase power regulator; the output terminal of the third controllable switching element connected to the third phase of the three-phase AC power is connected to the input terminal of the third single-phase power regulator.

[0013] In some preferred embodiments of this utility model, the fourth switching circuit further includes: a three-phase power regulator; the first output terminal, the second output terminal, and the third output terminal of the fourth controllable switching element are all connected to the input terminal of the three-phase power regulator;

[0014] The input terminals of the first output branch, the second output branch, the third output branch, the fourth output branch, the fifth output branch, and the sixth output branch are all connected to the output terminal of the three-phase power regulator.

[0015] In some preferred embodiments of this utility model, the three-phase power regulator is a silicon controlled rectifier (SCR) power regulator.

[0016] In some preferred embodiments of this utility model, the first switching circuit, the second switching circuit, and the third switching circuit all further include a transformer.

[0017] In some preferred embodiments of this invention, the output voltage of the transformer is 65V.

[0018] In some preferred embodiments of this utility model, the first heating module, the second heating module, and the third heating module each include at least one heating unit.

[0019] In some preferred embodiments of the present invention, the device includes: a first compensating heater, a second compensating heater, and a third compensating heater;

[0020] The two ends of the first compensation heater can be disconnected from the first and second phases of the three-phase AC power supply;

[0021] The two ends of the second compensation heater can be disconnected from the second and third phases of the three-phase AC power supply;

[0022] The two ends of the third compensation heater can be disconnected from the third phase and the first phase of the three-phase AC power supply.

[0023] In some preferred embodiments of this utility model, the first compensating heater, the second compensating heater, and the third compensating heater are each connected to a single-phase power regulator.

[0024] Secondly, this utility model provides a vacuum heating system, comprising: a vacuum heating device with a variable mode according to any one of the first aspects.

[0025] This invention provides a variable-mode vacuum heating device and vacuum heating system, applied to a vacuum heating system. The device includes: a first switching circuit, a second switching circuit, a third switching circuit, and a fourth switching circuit. The first switching circuit includes two first controllable switching elements, the input terminals of which are respectively connected to the first and second phases of a three-phase AC power supply, and the output terminals of which are respectively connected to the two ends of a first heating module. The second switching circuit includes two second controllable switching elements, the input terminals of which are respectively connected to the second and third phases of the three-phase AC power supply, and the output terminals of which are respectively connected to the two ends of a second heating module. The third switching circuit includes two third controllable switching elements, the input terminals of which are respectively connected to the third and first phases of the three-phase AC power supply, and the output terminals of which are respectively connected to the two ends of a third heating module. The fourth switching circuit includes three fourth controllable switching elements, the input terminals of which are respectively connected to the first, second, and third phases of the three-phase AC power supply; the first output terminal of each fourth controllable switching element is connected to... The input terminals of the first and second output branches are connected respectively. The second output terminal of the fourth controllable switch element is connected to the input terminals of the third and fourth output branches respectively. The third output terminal of the fourth controllable switch element is connected to the input terminals of the fifth and sixth output branches respectively. The output terminals of the second and third output branches are connected to the two ends of the first heating module respectively. The output terminals of the fourth and fifth output branches are connected to the two ends of the second heating module respectively. The output terminal of the sixth output branch and the output terminal of the first output branch are connected to the two ends of the third heating module respectively. The second end of the first heating module is connected to the first end of the second heating module through the fifth controllable switch element. The second end of the second heating module is connected to the first end of the third heating module through the sixth controllable switch element. The second end of the third heating module is connected to the first end of the first heating module through the seventh controllable switch element. The control circuit integrates a zone control circuit and a whole-zone control circuit, which can select the appropriate control mode according to different needs and realize the rapid switching of control mode, greatly improving the user experience. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1A schematic diagram of a variable-mode vacuum heating device provided for an embodiment of this utility model;

[0028] Figure 2 A schematic diagram of an equivalent single-zone independent control heating provided for an embodiment of this utility model;

[0029] Figure 3 A schematic diagram of an equivalent whole-area controlled heating provided for an embodiment of this utility model;

[0030] Figure 4 A schematic diagram of another variable-mode vacuum heating device provided in an embodiment of this utility model.

[0031] Icons: 110 - First phase; 120 - Second phase; 130 - Third phase; 210 - First controllable switch element; 220 - Second controllable switch element; 230 - Third controllable switch element; 310 - First heating module; 320 - Second heating module; 330 - Third heating module; 410 - Fourth controllable switch element; 421 - First output branch; 422 - Second output branch; 423 - Third output branch; 424 - Fourth output branch; 425 - Fifth output branch; 426 - Sixth output branch; 431 - Fifth controllable switch element; 432 - Connection to the sixth controllable switch element; 433 - Seventh controllable switch element; 510 - First single-phase power regulator; 520 - Second single-phase power regulator; 530 - Third single-phase power regulator; 540 - Three-phase power regulator. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] Example 1

[0040] This utility model embodiment provides a variable-mode vacuum heating device, applied to a vacuum heating system, see [link to relevant documentation]. Figure 1The schematic diagram shown in this embodiment of the present invention provides a variable-mode vacuum heating device. The device includes: a first switching circuit, a second switching circuit, a third switching circuit, and a fourth switching circuit. The first switching circuit includes two first controllable switching elements 210, the input terminals of which are respectively connected to the first phase 110 and the second phase 120 of the three-phase AC power supply, and the output terminals of which are respectively connected to the two ends of the first heating module 310. The second switching circuit includes two second controllable switching elements 220, the input terminals of which are respectively connected to the second phase 120 and the third phase 130 of the three-phase AC power supply, and the output terminals of which are respectively connected to the two ends of the second heating module 320. The third switching circuit includes two third controllable switching elements 230, the input terminals of which are respectively connected to the third phase 130 and the first phase 110 of the three-phase AC power supply, and the output terminals of which are respectively connected to the two ends of the third heating module 330.

[0041] Specifically, the first phase 110, the second phase 120, and the third phase 130 of the three-phase AC power supply are R phase, S phase, and T phase, respectively, and can also be referred to as A phase, B phase, and C phase. This embodiment of the invention does not specify the order. The controllable switching element can be a contactor, circuit breaker, or knife switch, etc. Two controllable switching elements in the same switching circuit can be switched on and off simultaneously. Taking the first switching circuit as an example, when both first controllable switching elements 210 are simultaneously switched on, the first heating module 310 is connected to the first phase 110 and the second phase 120 of the three-phase power supply, entering the working state. When the first heating module 310, the second heating module 320, and the third heating module 330 are controlled based on the first, second, and third switching circuits, it is essentially a single-zone independent heating control, such as... Figure 2 The diagram shown is a schematic representation of an equivalent single-zone independent control heating method provided by an embodiment of this utility model.

[0042] The fourth switching circuit includes three fourth controllable switching elements 410. The input terminals of the three fourth controllable switching elements 410 are respectively connected to the first phase 110, the second phase 120, and the third phase 130 of the three-phase AC power supply. The first output terminal of the fourth controllable switching element 410 is connected to the input terminal of the first output branch 421 and the input terminal of the second output branch 422, respectively. The second output terminal of the fourth controllable switching element 410 is connected to the input terminal of the third output branch 423 and the input terminal of the fourth output branch 424, respectively. The third output terminal of the fourth controllable switching element 410 is connected to the input terminal of the fifth output branch 425 and the input terminal of the sixth output branch 426, respectively. The output terminals of the second output branch 422 and the third output branch 424 are also connected to the input terminal of the third output branch 425 and the input terminal of the fourth output branch 426. The output terminals of the third heating module 3 are connected to the two ends of the first heating module 310, the output terminals of the fourth output branch 424 and the fifth output branch 425 are connected to the two ends of the second heating module 320, the output terminals of the sixth output branch 426 and the first output branch 421 are connected to the two ends of the third heating module 330, the second end of the first heating module 310 is connected to the first end of the second heating module 320 through the fifth controllable switch element 431, the second end of the second heating module 320 is connected to the first end of the third heating module 330 through the sixth controllable switch element 432, and the second end of the third heating module 330 is connected to the first end of the first heating module 310 through the seventh controllable switch element 433.

[0043] For details, see Figure 3 The schematic diagram shown in this embodiment of the present invention provides an equivalent whole-area controlled heating method. When the fourth controllable switch element 410, the fifth controllable switch element 431, the sixth controllable switch element and the seventh controllable switch element 433 are all closed, the first heating module 310, the second heating module 320 and the third heating module 330 can be equivalent to a delta connection.

[0044] This invention provides a variable-mode vacuum heating device for use in a vacuum heating system. The device includes: a first switching circuit, a second switching circuit, a third switching circuit, and a fourth switching circuit. The first switching circuit includes two first controllable switching elements 210, whose input terminals are respectively connected to the first phase 110 and the second phase 120 of a three-phase AC power supply, and whose output terminals are respectively connected to both ends of a first heating module 310. The second switching circuit includes two second controllable switching elements 220, whose input terminals are respectively connected to the second phase 120 and the third phase 130 of the three-phase AC power supply. The output terminals of the two second controllable switching elements 220 are respectively connected to the two ends of the second heating module 320; the third switching circuit includes two third controllable switching elements 230, the input terminals of which are respectively connected to the third phase 130 and the first phase 110 of the three-phase AC power supply, and the output terminals of which are respectively connected to the two ends of the third heating module 330; the fourth switching circuit includes three fourth controllable switching elements 410, the input terminals of which are respectively connected to the first phase 110, the second phase 120, and the third phase 130 of the three-phase AC power supply; the first output terminal of the fourth controllable switching element 410 is connected to the first output branch. The input terminal of the fourth controllable switch element 421 is connected to the input terminal of the second output branch 422, respectively. The second output terminal of the fourth controllable switch element 410 is connected to the input terminals of the third output branch 423 and the fourth output branch 424, respectively. The third output terminal of the fourth controllable switch element 410 is connected to the input terminals of the fifth output branch 425 and the sixth output branch 426, respectively. The output terminals of the second output branch 422 and the third output branch 423 are connected to the two ends of the first heating module 310, respectively. The output terminals of the fourth output branch 424 and the fifth output branch 425 are connected to the two ends of the second heating module 320, respectively. The output terminal of the sixth output branch 426 is connected to the input terminal of the fifth output branch 425, respectively. The output terminals of the first output branch 421 and the output terminals of the first output branch 421 are respectively connected to the two ends of the third heating module 330; the second end of the first heating module 310 is connected to the first end of the second heating module 320 through the fifth controllable switch element 431, the second end of the second heating module 320 is connected to the first end of the third heating module 330 through the sixth controllable switch element 432, and the second end of the third heating module 330 is connected to the first end of the first heating module 310 through the seventh controllable switch element 433; the control circuit integrates the partition control circuit and the whole area control circuit, which can select the appropriate control mode according to different needs, realize the rapid switching of control mode, and greatly improve the user experience.

[0045] Example 2

[0046] Based on the above embodiments, this utility model provides another variable-mode vacuum heating device. See also Figure 4 The schematic diagram of another variable-mode vacuum heating device provided by this embodiment of the present invention is shown. The first switching circuit further includes: a first single-phase power regulator 510; the output terminal of a first controllable switching element 210 connected to the first phase 110 of the three-phase AC power is connected to the input terminal of the first single-phase power regulator 510; the second switching circuit further includes: a second single-phase power regulator 520; the output terminal of a second controllable switching element 220 connected to the second phase 120 of the three-phase AC power is connected to the input terminal of the second single-phase power regulator 520; the third switching circuit further includes: a third single-phase power regulator 530; the output terminal of a third controllable switching element 230 connected to the third phase 130 of the three-phase AC power is connected to the input terminal of the third single-phase power regulator 530.

[0047] Specifically, the single-phase power regulator adjusts the voltage or current of a single-phase AC power supply by controlling the conduction angle (phase control) or on / off time ratio (zero-crossing trigger) of the thyristor, thereby adjusting the load power. This enables precise temperature control of the heating module, achieving constant temperature by adjusting the heating power. Furthermore, soft starting can reduce current surges and extend equipment life; on-demand power adjustment avoids energy waste.

[0048] Further details can be found by referring to [link / reference]. Figure 4 In some preferred embodiments of this utility model, the fourth switching circuit further includes: a three-phase power regulator 540; the first output terminal, the second output terminal, and the third output terminal of the fourth controllable switching element 410 are all connected to the input terminal of the three-phase power regulator 540; the input terminals of the first output branch 421, the second output branch 422, the third output branch 423, the fourth output branch 424, the fifth output branch 425, and the sixth output branch 426 are all connected to the output terminal of the three-phase power regulator 540.

[0049] Specifically, the three-phase power regulator 540 can independently or synchronously regulate each phase of the three-phase AC power to ensure balanced three-phase load, avoid grid imbalance, achieve smooth power output by coordinating the conduction of the three phases, and realize synchronous temperature control in multiple areas.

[0050] Furthermore, in some preferred embodiments of this utility model, the three-phase power regulator 540 is a thyristor power regulator.

[0051] Furthermore, in some preferred embodiments of this utility model, the first single-phase power regulator 510, the second single-phase power regulator 520 and the third single-phase power regulator 530 are all thyristor power regulators.

[0052] Specifically, the core component of a thyristor power regulator is a silicon controlled rectifier (SCR), typically composed of a pair of anti-parallel thyristors to achieve bidirectional conduction control of AC power. It adjusts the output power by receiving external control signals and can provide overcurrent protection, overvoltage protection, and overheat protection, ensuring safe operation of the equipment. Incorporating a thyristor power regulator into the device enables rapid response, improves regulation accuracy, and offers advantages such as long lifespan, low maintenance costs, and support for multiple control modes, allowing for flexible control of the device.

[0053] Furthermore, in some preferred embodiments of this utility model, the first switching circuit, the second switching circuit, and the third switching circuit all further include a transformer.

[0054] Specifically, installing a transformer can convert the mains voltage to the rated voltage for the device's operation and reduce current surges.

[0055] Furthermore, in some preferred embodiments of this invention, the output voltage of the transformer is 65V.

[0056] Furthermore, in some preferred embodiments of this utility model, the first heating module 310, the second heating module 320 and the third heating module 330 each include at least one heating unit.

[0057] Specifically, multiple heating units can be placed in different locations within the same area to achieve balanced heating of a single area, or they can be placed in multiple different heating areas to achieve simultaneous heating of multiple areas. For examples, see below. Figures 1 to 4 The heating modules shown in the diagram each contain two heating units.

[0058] Furthermore, in some preferred embodiments of this utility model, the device includes: a first compensating heater, a second compensating heater, and a third compensating heater; the two ends of the first compensating heater are detachably connected to the first phase 110 and the second phase 120 of the three-phase AC power supply; the two ends of the second compensating heater are detachably connected to the second phase 120 and the third phase 130 of the three-phase AC power supply; the two ends of the third compensating heater are detachably connected to the third phase 130 and the first phase 110 of the three-phase AC power supply.

[0059] Specifically, the power of the compensation heater is much smaller than that of the built-in heating module. It primarily serves as a compensatory heater during zone-wide control. Due to the existence of single-zone control mode, the aging levels of each heating module are not uniform. In zone-wide control mode, the three-phase power regulator 540 provides overall adjustment. When the temperature of the heating zone corresponding to a certain heating module fails to meet the standard, the corresponding compensation heater can be activated. The switching circuit of the compensation heater is identical in form to the first switching circuit, and is controlled by two interconnected controllable switching elements.

[0060] Furthermore, in some preferred embodiments of this utility model, the first compensating heater, the second compensating heater, and the third compensating heater are each connected to a single-phase power regulator.

[0061] Specifically, the compensating heater adjusts its output power through a single-phase power regulator to achieve precise control of the compensating heat.

[0062] Example 3

[0063] Based on the above embodiments, the present invention provides a vacuum heating system, including: a vacuum heating device with a variable mode provided in any of the above embodiments.

[0064] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the vacuum heating system described above can be referred to the corresponding process in the aforementioned embodiments of the variable-mode vacuum heating device, and will not be repeated here.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A vacuum heating device with variable mode, characterized in that, The device, which is used in a vacuum heating system, includes: a first switching circuit, a second switching circuit, a third switching circuit, and a fourth switching circuit; The first switching circuit includes two first controllable switching elements. The input terminals of the two first controllable switching elements are respectively connected to the first phase and the second phase of the three-phase AC power supply, and the output terminals of the two first controllable switching elements are respectively connected to the two ends of the first heating module. The second switching circuit includes two second controllable switching elements. The input terminals of the two second controllable switching elements are respectively connected to the second phase and the third phase of the three-phase AC power supply, and the output terminals of the two second controllable switching elements are respectively connected to the two ends of the second heating module. The third switching circuit includes two third controllable switching elements. The input terminals of the two third controllable switching elements are respectively connected to the third phase and the first phase of the three-phase AC power supply, and the output terminals of the two third controllable switching elements are respectively connected to the two ends of the third heating module. The fourth switching circuit includes three fourth controllable switching elements. The input terminals of the three fourth controllable switching elements are respectively connected to the first phase, second phase, and third phase of the three-phase AC power supply. The first output terminal of each fourth controllable switching element is connected to the input terminals of the first and second output branches, respectively. The second output terminal of each fourth controllable switching element is connected to the input terminals of the third and fourth output branches, respectively. The third output terminal of each fourth controllable switching element is connected to the input terminals of the fifth and sixth output branches, respectively. The output terminals of the second and third output branches are respectively connected to the two ends of the first heating module. The output terminals of the fourth and fifth output branches are respectively connected to the two ends of the second heating module. The output terminal of the sixth output branch and the output terminal of the first output branch are respectively connected to the two ends of the third heating module. The second end of the first heating module is connected to the first end of the second heating module through a fifth controllable switch element, the second end of the second heating module is connected to the first end of the third heating module through a sixth controllable switch element, and the second end of the third heating module is connected to the first end of the first heating module through a seventh controllable switch element.

2. The variable-mode vacuum heating device according to claim 1, characterized in that, The first switching circuit further includes: a first single-phase power regulator; the output terminal of the first controllable switching element connected to the first phase of the three-phase AC power is connected to the input terminal of the first single-phase power regulator; The second switching circuit further includes: a second single-phase power regulator; the output terminal of the second controllable switching element connected to the second phase of the three-phase AC power is connected to the input terminal of the second single-phase power regulator; The third switching circuit further includes: a third single-phase power regulator; the output terminal of the third controllable switching element connected to the third phase of the three-phase AC power is connected to the input terminal of the third single-phase power regulator.

3. The variable-mode vacuum heating device according to claim 1, characterized in that, The fourth switching circuit further includes a three-phase power regulator; the first output terminal, the second output terminal, and the third output terminal of the fourth controllable switching element are all connected to the input terminal of the three-phase power regulator; The input terminals of the first output branch, the second output branch, the third output branch, the fourth output branch, the fifth output branch, and the sixth output branch are all connected to the output terminal of the three-phase power regulator.

4. The variable-mode vacuum heating device according to claim 3, characterized in that... The three-phase power regulator is a thyristor power regulator.

5. The variable-mode vacuum heating device according to claim 1, characterized in that, The first switching circuit, the second switching circuit, and the third switching circuit all further include a transformer.

6. The variable-mode vacuum heating device according to claim 5, characterized in that, The transformer has an output voltage of 65V.

7. The variable-mode vacuum heating device according to claim 1, characterized in that, The first heating module, the second heating module, and the third heating module each include at least one heating unit.

8. The variable-mode vacuum heating device according to claim 1, characterized in that, The device includes: a first compensation heater, a second compensation heater, and a third compensation heater; The two ends of the first compensation heater are detachably connected to the first and second phases of a three-phase alternating current. The two ends of the second compensation heater are detachably connected to the second and third phases of a three-phase AC power supply; The two ends of the third compensation heater are detachably connected to the third phase and the first phase of the three-phase AC power supply.

9. The variable-mode vacuum heating device according to claim 8, characterized in that, The first compensating heater, the second compensating heater, and the third compensating heater are each connected to a single-phase power regulator.

10. A vacuum heating system, characterized in that, include: The mode-variable vacuum heating device according to any one of claims 1 to 9.

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