Multi-channel spiral microwave heater

Abstract

The present invention provides a multi-channel spiral microwave heater. This microwave heater utilizes multiple magnetrons. The microwaves emitted by the multiple magnetrons are collected into the waveguide through a multi-channel waveguide, achieving energy superposition. The waveguide adopts a spiral structure, and multiple transverse waveguides are arranged from top to bottom on opposite sides of the spiral waveguide. This forms multiple transverse microwave emitting ends from top to bottom on a microwave heating rod device, enabling the microwave heater to fully emit microwaves into the soil over a wide range. Furthermore, the pitch of the spiral waveguide gradually decreases from top to bottom, resulting in a gradually decreasing spacing between the transmitting antennas from top to bottom. This concentrates the microwave energy at the bottom of the microwave heater, preventing the microwave energy from being weakened when it reaches the bottom of the spiral waveguide, effectively improving the heating effect on deep soil.

Description

Technical Field

[0001] The invention belongs to the technical field of ground heating, and in particular relates to a multi-channel spiral microwave heater. Background Art

[0002] In cold regions, especially in winter, the foundation can freeze due to low temperatures, forming frozen soil. Continuous negative temperatures gradually increase the freezing depth of the soil, causing the soil to experience a frost heave effect. This can lead to uneven uplift and deformation of the foundation, damaging the structures and buildings on the foundation (such as canals, pipes, etc.), causing them to crack, deform, shift, or even collapse, seriously affecting their service life. Therefore, heating the foundation soil can be used to effectively prevent the frost heave effect of the soil and damage to the structures and buildings on the foundation. In addition, in addition to the need to heat frozen soil, other technical scenarios also face the technical need to heat the foundation soil.

[0003] Existing foundation heating technology usually uses electric heating (electric heating rods) for heating, which consumes a lot of energy and has a limited heat transfer range. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and to provide a multi-channel spiral microwave heater.

[0005] The present invention is achieved through the following technical solutions:

[0006] A multi-channel spiral microwave heater comprises a rod tube body, within which a mounting frame, a control circuit board, multiple magnetrons, a multi-channel waveguide, a collecting waveguide, a spiral waveguide, a transverse waveguide, and a transmitting antenna are arranged. The control circuit board is fixed within the rod tube body. The number of magnetrons matches the number of channel waveguides and is connected one-to-one. The bottom outlets of all channel waveguides are collectively connected to the collecting waveguide, which is connected to the spiral waveguide. The mounting frame comprises a top plate and two symmetrically arranged vertical side plates fixedly connected below the top plate. The collecting waveguide vertically passes through the center of the top plate. The two vertical side plates are symmetrically located on either side of the spiral waveguide. A transverse waveguide is provided at the intersection of the spiral waveguide and the vertical side plates. The transverse waveguide is transversely installed on the vertical side plates, and the inner port of the transverse waveguide is connected to the spiral waveguide. The transmitting antenna is provided at the outer port of the transverse waveguide. Correspondingly, a through hole is opened in the wall of the rod tube body, corresponding to the position of each transmitting antenna, and a glass cover is installed on the outer side of the through hole.

[0007] In the above technical solution, heat dissipation fins are provided on the tube wall of the rod tube body in the installation area corresponding to the control circuit board and the magnetron, so as to enhance the heat dissipation effect of the area.

[0008] In the above technical solution, the number of magnetrons is preferably 3, which are evenly arranged along the circumference on the bottom surface of the control circuit board. The number of channel waveguides is 3, and the top inlets of the 3 channel waveguides are connected to the 3 magnetrons one by one.

[0009] In the above technical solution, a horn-shaped reflective dish is provided on the inner wall of the spiral waveguide tube opposite to the inner port of the transverse waveguide tube, for emitting microwaves in the spiral waveguide tube into the transverse waveguide tube.

[0010] In the above technical solution, the transmitting antenna includes a rectangular box body, the inner side surface of the rectangular box body (i.e., the side facing the spiral waveguide tube) is connected to the transverse waveguide tube, the outer side surface of the rectangular box body (i.e., the side facing the soil body) is open, and a pair of eight-shaped guide plates that gradually expand from the inside to the outside are arranged in the rectangular box body. The microwaves are diffused outward through the eight-shaped guide plates, thereby increasing the irradiation range of the microwaves.

[0011] In the above technical solution, the pitch of the spiral waveguide tube gradually decreases from top to bottom, and at the same time, the layout spacing of the transmitting antenna gradually decreases from top to bottom, so that the microwave energy is concentrated at the bottom of the multi-channel spiral microwave heater, avoiding the energy weakening when the microwave energy is transmitted to the bottom of the spiral waveguide tube, and can effectively improve the heating effect of deep soil.

[0012] In the above technical solution, the opening of the figure-eight guide plate of each transmitting antenna of the multi-channel spiral microwave heater gradually decreases from top to bottom, that is, as the depth of the soil increases, the opening of the figure-eight guide plate of the transmitting antenna gradually decreases, thereby reducing the range of microwave irradiation and improving the deep heating efficiency.

[0013] In the above technical solution, a temperature sensor is also provided on the rod tube body for detecting the temperature of the soil. The detection signal of the temperature sensor is transmitted to the control circuit on the control circuit board. The control circuit controls the magnetron to start and emit microwaves based on the detection data of the temperature sensor.

[0014] The advantages and beneficial effects of the present invention are:

[0015] The multi-channel spiral microwave heater of the present invention uses microwave heating to heat soil. Compared with electric heating, it has low energy consumption and a large heating range. The present invention uses multiple magnetrons. The microwaves emitted by the multiple magnetrons are collected into the waveguide through a multi-channel waveguide, achieving energy superposition. The waveguide adopts a spiral structure, and multiple transverse waveguides are arranged from top to bottom on opposite sides of the spiral waveguide, thereby forming multiple transverse microwave emitting ends from top to bottom on a microwave heater, enabling the multi-channel spiral microwave heater to fully emit microwaves into the soil over a wide range. Furthermore, the transmitting antenna of the multi-channel spiral microwave heater includes a rectangular box body, and a pair of eight-shaped guide plates that gradually expand from the inside to the outside are provided in the rectangular box body. The eight-shaped guide plates are used to diffuse the microwaves outward, further increasing the microwave irradiation range. Furthermore, the pitch of the spiral waveguide decreases from top to bottom, which in turn reduces the spacing between the transmitting antennas. This concentrates microwave energy at the bottom of the multi-channel spiral microwave heater, preventing energy loss as it reaches the bottom of the spiral waveguide, effectively improving the heating effect on deep soil. Furthermore, the openings of the figure-eight guide plates of each transmitting antenna decrease from top to bottom. As the soil depth increases, the openings of the figure-eight guide plates of the transmitting antennas decrease, reducing the range of microwave irradiation, allowing deeper soil layers to receive higher energy density and improving deep heating efficiency.

[0016] The multi-channel spiral microwave heater of the present invention is also equipped with a temperature sensor for detecting soil temperature. The temperature sensor's detection signal is transmitted to a control circuit on a control circuit board. Based on the temperature sensor's detection data, the control circuit activates the magnetron and emits microwaves. This temperature feedback control mechanism enables automated regulation of the soil heating process, ensuring heating efficiency and temperature control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the external structure of a multi-channel spiral microwave heater.

[0018] Figure 2 Schematic diagram of the internal structure of a multi-channel spiral microwave heater.

[0019] Figure 3 It is a partial cross-sectional view of a multi-channel spiral microwave heater.

[0020] Figure 4 Schematic diagram of the structure of the transmitting antenna of the multi-channel spiral microwave heater.

[0021] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention are further described below with reference to specific embodiments.

[0023] This embodiment provides a multi-channel spiral microwave heater. When in use, the multi-channel spiral microwave heater is inserted into the foundation to perform microwave heating on the foundation soil, thereby increasing the temperature of the soil and preventing frost heave of the soil.

[0024] See attached Figure 1 -Attached Figure 4 The multi-channel spiral microwave heater includes a rod tube body 11, inside which are arranged a mounting frame 101, a control circuit board 102, a plurality of magnetrons 103, a multi-channel waveguide tube 104, a collecting waveguide tube 105, a spiral waveguide tube 106, a transverse waveguide tube 107 and a transmitting antenna 108, wherein the control circuit board 102 is fixed in the rod tube body 11 by a bracket 109, and the control circuit board 102 is provided with a control circuit and key components such as a transformer, a high-voltage capacitor and a diode. This is a prior art and will not be described in detail here; the number of magnetrons 103 is preferably 3, which are evenly arranged along the circumference on the bottom surface of the control circuit board 102, the number of channel waveguide tubes 104 is 3, the top inlets of the three channel waveguide tubes 104 are respectively connected to the three magnetrons 103 in a one-to-one correspondence, and the bottom outlets of the three channel waveguide tubes 104 are collectively connected to the collecting waveguide tube 105, and the collecting waveguide The tube 105 is connected to the spiral waveguide tube 106; the mounting frame 101 includes a top plate 1011 and two symmetrically arranged vertical side plates 1012 fixedly connected to the bottom of the top plate. The collecting waveguide tube 105 vertically penetrates the center position of the top plate 1011, and the two vertical side plates 1012 are symmetrically located on both sides of the spiral waveguide tube 106. A transverse waveguide tube 107 is provided at the intersection of the spiral waveguide tube 106 and the vertical side plates 1012. The transverse waveguide tube 107 is installed transversely on the vertical side plates 1012, and the inner port of the transverse waveguide tube 107 is connected to the spiral waveguide tube 106. The outer port of the transverse waveguide tube 107 is provided with a transmitting antenna 108; correspondingly, a through hole 111 is opened on the tube wall of the rod tube body 11 corresponding to the position of each transmitting antenna 108, and a glass cover 112 is installed on the outer side of the through hole 111 to prevent external soil from entering the interior of the rod tube body 11. During operation, the microwaves emitted by the three magnetrons 103 are collected by the three-way channel waveguide tube 104 to the collecting waveguide tube 105 to achieve energy superposition, and then transmitted by the collecting waveguide tube 105 to the spiral waveguide tube 106. Then, the microwaves are emitted outward through the multiple transverse waveguide tubes 107 on both sides of the spiral waveguide tube 106, the transmitting antenna 108 and the glass cover 112 on the wall of the rod tube body 11, thereby heating the soil with microwaves.

[0025] Furthermore, heat dissipation fins 12 are provided on the tube wall of the rod tube body 11 in the installation area corresponding to the control circuit board 102 and the magnetron 103 to enhance the heat dissipation effect in this area.

[0026] Furthermore, a horn-shaped reflection plate 1061 is provided on the inner wall of the spiral waveguide tube 106 opposite to the inner port of the transverse waveguide tube 107 , so as to transmit the microwaves in the spiral waveguide tube 106 into the transverse waveguide tube 107 .

[0027] For further information, see the attached Figure 4 The transmitting antenna 108 includes a rectangular box body 1081, the inner side of the rectangular box body 1081 (i.e., the side facing the spiral waveguide tube 106) is connected to the transverse waveguide tube 107, and the outer side of the rectangular box body 1081 (i.e., the side facing the soil) is open, and a pair of eight-shaped guide plates 1082 that gradually expand from the inside to the outside are arranged in the rectangular box body 1081. The microwaves are diffused outward through the eight-shaped guide plates 1082, thereby increasing the irradiation range of the microwaves.

[0028] Furthermore, the pitch of the spiral waveguide tube 106 gradually decreases from top to bottom, and at the same time, the layout spacing of the transmitting antenna 108 gradually decreases from top to bottom, so that the microwave energy is concentrated at the bottom of the multi-channel spiral microwave heater, avoiding the energy weakening when the microwave energy is transmitted to the bottom of the spiral waveguide tube, and can effectively improve the heating effect of deep soil.

[0029] Furthermore, the opening of the figure-eight guide plate 1082 of each transmitting antenna 108 of the multi-channel spiral microwave heater gradually decreases from top to bottom, that is, as the depth of the soil increases, the opening of the figure-eight guide plate 1082 of the transmitting antenna 108 gradually decreases, so that the range of microwave irradiation is reduced and the energy density is increased, so as to improve the deep heating efficiency, achieve thawing of frozen soil in a shorter time, and further improve the heating effect on the soil.

[0030] Furthermore, a temperature sensor is installed on the rod tube 11 to monitor the soil temperature. The temperature sensor's detection signal is transmitted to the control circuit on the control circuit board 102. Based on the temperature sensor's detection data, the control circuit activates the magnetron and emits microwaves. This temperature feedback control mechanism enables automated regulation of the soil heating process, ensuring heating efficiency and temperature control accuracy.

[0031] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0032] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0033] The above is an exemplary description of the present invention. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by other skilled in the art without expending creative labor falls within the scope of protection of the present invention.

Claims

1. A multi-channel spiral microwave heater, characterized in that: The invention comprises a rod tube body, inside which are arranged a mounting frame, a control circuit board, a plurality of magnetrons, a multi-channel waveguide tube, a collecting waveguide tube, a spiral waveguide tube, a transverse waveguide tube and a transmitting antenna, wherein the control circuit board is fixed in the rod tube body; the number of magnetrons is consistent with the number of channel waveguide tubes, and they are connected one-to-one, the bottom outlets of all channel waveguide tubes are collectively connected to the collecting waveguide tube, and the collecting waveguide tube is connected to the spiral waveguide tube; the mounting frame comprises a top plate and two symmetrically arranged vertical side plates fixedly connected to the bottom of the top plate, the collecting waveguide tube vertically passes through the center of the top plate, the two vertical side plates are symmetrically located on both sides of the spiral waveguide tube, and the spiral waveguide tube and the vertical side plates intersect at the intersection. A transverse waveguide is arranged at a position, which is installed on the vertical side plate horizontally, and the inner port of the transverse waveguide is connected to the spiral waveguide, and the outer port of the transverse waveguide is provided with a transmitting antenna; correspondingly, a through hole is opened on the tube wall of the rod tube body corresponding to the position of each transmitting antenna, and a glass cover is installed on the outer side of the through hole; when working, the microwaves emitted by the multiple magnetrons are collected into the collecting waveguide through the corresponding channel waveguides connected to each other, so as to achieve energy superposition, and then transmitted to the spiral waveguide by the collecting waveguide, and then emitted outward through the multiple transverse waveguides on both sides of the spiral waveguide via the transmitting antenna and the glass cover on the tube wall of the rod tube body, so as to perform microwave heating on the soil.

2. The multi-channel spiral microwave heater according to claim 1, characterized in that: Heat dissipation fins are provided on the tube wall of the rod tube body in the installation area corresponding to the control circuit board and the magnetron.

3. The multi-channel spiral microwave heater according to claim 1, characterized in that: There are three magnetrons, which are evenly arranged along the circumference on the bottom surface of the control circuit board. There are three channel waveguides, and the top inlets of the three channel waveguides are connected to the three magnetrons one by one.

4. The multi-channel spiral microwave heater according to claim 1, characterized in that: A horn-shaped reflecting plate is provided on the inner wall of the spiral waveguide tube opposite to the inner port of the transverse waveguide tube, so as to emit the microwaves in the spiral waveguide tube into the transverse waveguide tube.

5. The multi-channel spiral microwave heater according to claim 1, characterized in that: The transmitting antenna includes a rectangular box body, the inner side of the rectangular box body is connected to the transverse waveguide tube, the outer side of the rectangular box body is open, and a pair of eight-shaped guide plates that gradually expand from the inner side to the outer side are arranged in the rectangular box body.

6. The multi-channel spiral microwave heater according to claim 1, characterized in that: The pitch of the spiral waveguide tube gradually decreases from top to bottom, and at the same time, the layout spacing of the transmitting antennas gradually decreases from top to bottom.

7. The multi-channel spiral microwave heater according to claim 5, characterized in that: The opening of the figure-eight guide plate of each transmitting antenna of the multi-channel spiral microwave heater gradually decreases from top to bottom.

8. The multi-channel spiral microwave heater according to claim 1, characterized in that: A temperature sensor is also provided on the rod tube body for detecting the temperature of the soil. The detection signal of the temperature sensor is transmitted to the control circuit on the control circuit board. The control circuit controls the magnetron to start and emit microwaves according to the detection data of the temperature sensor.

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