A radio frequency heating system with adjustable distance between positive and negative plates

Abstract

The present application relates to the technical field of food heating, and discloses a radio frequency heating system with adjustable distance between positive and negative plates, which comprises a box body, a front door, a back door, a lower plate, an upper plate, a lifting mechanism and a radio frequency power supply, the lower plate is fixed to the inner bottom surface of the box body, the upper plate is arranged on the inner top of the box body above the lower plate, the lifting mechanism is fixed to the outer top of the box body and its lifting output end penetrates through the top surface of the box body and is fixed to the upper surface of the upper plate, and the radio frequency power supply is located outside the box body and electrically connected with the upper plate and the lower plate respectively. By penetrating the lifting output end of the lifting mechanism through the top surface of the box body and fixing it to the upper surface of the upper plate, the distance between the upper plate and the lower plate can be dynamically changed, the impedance value of the capacitor formed between the food to be heated and the upper plate and the lower plate in the circuit can be changed, the distance between the food to be heated and the lower surface of the upper plate can be shortened, the radio frequency heating effect can be improved, and the energy consumption can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of food heating, in particular to a radio frequency heating system with adjustable distance between positive and negative electrode plates. BACKGROUND

[0002] Radio frequency wave is a high frequency electromagnetic wave of 1-300MHz. The high frequency electromagnetic wave excites the vibration or rotation of micro-particles such as ions, atoms and molecules inside the food, so that the whole food is rapidly heated to achieve the effect of rapid overall heating.

[0003] A typical radio frequency heating device is a horizontally opposed electrode plate type heating. The high frequency voltage alternating current generated by the radio frequency power supply is amplified by the power amplifier and then connected to two parallel placed electrode plates. The high voltage high frequency electric field acts on the whole food, and the electromagnetic energy is converted into heat energy in the food, so that the food is heated. Radio frequency heating can avoid the slow heating speed caused by the external to internal heating and the limitation of heat source temperature and the heat conduction characteristics of the food itself in the traditional heating method. The material can be rapidly heated to the required temperature, and the heating uniformity is greatly improved.

[0004] During the heating of the material, the positive and negative electrode plates, the container containing the material and the air gap therebetween form a parallel plate capacitor. Under the same input power and electrode plate spacing, different thickness of the material corresponds to different parallel plate capacitor impedance values. The shorter the distance between the upper surface of the material and the lower surface of the positive electrode, the more energy the material absorbs per unit time during the heating process, that is, the faster the heating.

[0005] Therefore, how to design a radio frequency heating system that can arbitrarily adjust the distance between the positive and negative electrode plates to improve the heating efficiency of radio frequency heating is a technical problem that technicians in the field need to solve. SUMMARY

[0006] The present application provides a radio frequency heating system that can adjust the distance between the electrode plates, solving the technical problem of the existing radio frequency heating device that the distance between the positive and negative electrode plates cannot be adjusted, consuming more energy and having low heating efficiency.

[0007] The technical solution of the present application to solve the above technical problem is as follows: a radio frequency heating system with adjustable distance between positive and negative electrode plates, comprising: a box body, a front door, a rear door, a lower electrode plate, an upper electrode plate, a lifting mechanism and a radio frequency power supply,

[0008] The front end face and the rear end face of the box body are provided with openings; the front door and the rear door are respectively hinged at the opening of the front end face of the box body and the opening of the rear end face of the box body; the lower pole plate is fixed to the inner bottom face of the box body; the upper pole plate is arranged above the lower pole plate and on the inner top of the box body; the lifting mechanism is fixed to the outer top of the box body and the lifting output end thereof is fixed to the upper surface of the upper pole plate through the top face of the box body; the radio frequency power supply is located outside the box body and is electrically connected with the upper pole plate and the lower pole plate respectively.

[0009] The beneficial effect of the present application is that the lifting output end of the lifting mechanism is fixed to the upper surface of the upper pole plate through the top face of the box body, the distance between the upper pole plate and the lower pole plate can be dynamically changed, the impedance value of the capacitor formed between the food to be heated and the upper pole plate and the lower pole plate in the circuit is changed, the distance between the food to be heated and the lower surface of the upper pole plate is shortened, the radio frequency heating effect is improved, the heating time is shortened, and the energy consumption is reduced.

[0010] On the basis of the above technical solution, the present application can be further improved as follows.

[0011] Further, the lifting mechanism comprises a lower connecting plate, an upper connecting plate, a plurality of slide rods, a nut and a lead screw, the top face of the box body is provided with a plurality of sliding holes; the lower connecting plate is the lifting output end, the lower connecting plate is located inside the box body and is fixed in parallel to the upper surface of the upper pole plate; the upper connecting plate is arranged on the outer top of the box body and is parallel to the lower connecting plate, a through hole is formed in the middle of the upper connecting plate and penetrates through the two lower end faces thereof; a plurality of slide rods are respectively and slidably connected in a plurality of sliding holes and the bottom ends thereof are respectively and perpendicularly fixed to the upper surface of the lower connecting plate and the top ends thereof are respectively and perpendicularly fixed to the lower surface of the upper connecting plate; the bottom end of the nut is fixed to the upper surface of the upper connecting plate and the inner hole thereof is communicated with the through hole; the lead screw is threadedly connected in the nut and the bottom end thereof can pass out of the through hole.

[0012] The above further beneficial effect is that by rotating the lead screw, the nut, the upper connecting plate, the plurality of slide rods and the lower connecting plate can be driven to move up and down, thereby conveniently adjusting the distance between the upper pole plate and the lower pole plate, so as to change the impedance value of the capacitor formed between the food to be heated and the upper pole plate and the lower pole plate in the circuit.

[0013] Further, the lifting mechanism further comprises two support strips and a fixed strip, the two support strips are arranged in parallel on the opposite sides of the lead screw and the bottom ends thereof are fixed to the outer top of the box body; the two ends of the fixed strip are perpendicularly fixed to the top ends of the two support strips and a through hole is formed in the middle of the fixed strip and penetrates through the two ends thereof; the top end of the lead screw passes out of the through hole.

[0014] The two supporting strips and the fixed strip can form an inverted U-shaped support structure, which can support the lead screw, thereby improving the stability of the lifting mechanism structure.

[0015] Further, the lifting mechanism further comprises a handle, which is fixed to the top end of the lead screw passing through the through hole.

[0016] Further, an impedance matching device is further included, which is electrically connected with the radio frequency power supply through a 50Ω coaxial cable and is electrically connected with the upper plate and the lower plate through copper strips respectively.

[0017] The radio frequency power supply and the impedance matching device can realize energy transmission and adjustment control of the internal power supply of the impedance matching device, the load and the impedance matching device can realize low impedance and high transmission electrical connection, and the impedance matching device can adjust the load with different impedance values to reduce the reflected power of the circuit to the minimum, thereby protecting the power supply and improving the electrical energy transmitted to the load end; in addition, the impedance matching device is electrically connected with the upper plate and the lower plate through copper strips, which can form good electrical connection, reduce the impedance consumption of electrical energy in the transmission line, and improve the energy utilization rate of the system

[0018] Further, a plurality of lower plate fixing members are further included, which are fixed at intervals on the inner bottom surface of the box body; the lower plate is fixed to the top end of the plurality of lower plate fixing members.

[0019] Further, a plurality of upper plate fixing members are further included, which are fixed on the plurality of lower plate fixing members respectively; the lower plate is fixed on the plurality of upper plate fixing members. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a front view structural schematic diagram of the radio frequency heating system with adjustable positive and negative plate spacing of the application;

[0021] Figure 2 It is a principle schematic diagram of the radio frequency heating system with adjustable positive and negative plate spacing of the application;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the radio frequency heating system with adjustable positive and negative plate spacing of the application after removing the radio frequency power supply and the impedance matching device;

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the lifting mechanism in the radio frequency heating system with adjustable positive and negative plate spacing of the application.

[0024] In the drawings, the components represented by the numbers in the drawings are listed as follows:

[0025] 1, box, 2, front door, 3, rear door, 4, lower plate, 5, upper plate, 6, lifting mechanism, 61, lower connecting plate, 62, upper connecting plate, 63, slide rod, 64, nut, 65, lead screw, 66, support strip, 67, fixed plate, 68, handle, 7, RF power supply, 8, impedance matching device, 9, lower plate fixing part, 10, upper plate fixing part, 11, 50Ω coaxial cable, 12, copper strip. DETAILED DESCRIPTION

[0026] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and are not intended to limit the scope of the present application.

[0027] As shown in Figure 1 A RF heating system with adjustable positive and negative plate spacing, comprising: a box 1, a front door 2, a rear door 3, a lower plate 4, an upper plate 5, a lifting mechanism 6 and a RF power supply 7,

[0028] The front end face and the rear end face of the box 1 have openings; the front door 2 and the rear door 3 are respectively hinged to the opening at the front end face of the box 1 and the opening at the rear end face of the box 1; the lower plate 4 is fixed to the inner bottom surface of the box 1; the upper plate 5 is arranged above the lower plate 4 on the inner top of the box 1; the lifting mechanism 6 is fixed to the outer top of the box 1 and its lifting output end is fixed to the upper surface of the upper plate 5 through the top surface of the box 1; the RF power supply 7 is located outside the box 1 and is electrically connected to the upper plate 5 and the lower plate 4 respectively.

[0029] Specifically, the box 1, the front door 2 and the rear door 3 are all made of 304 stainless steel; the size of the lower plate is 335×280×2mm 3 , made of aluminum plate.

[0030] In some embodiments, the lifting mechanism 6 can include a lower connecting plate 61, an upper connecting plate 62, a plurality of slide rods 63, a nut 64 and a lead screw 65, the top surface of the box 1 is provided with a plurality of sliding holes; the lower connecting plate 61 is the lifting output end, the lower connecting plate 61 is located inside the box 1 and is fixed parallel to the upper surface of the upper plate 5; the upper connecting plate 62 is arranged on the outer top of the box 1 and is parallel to the lower connecting plate 61, a through hole is provided in the middle of the upper connecting plate and penetrates through the two lower end surfaces; a plurality of slide rods 63 are respectively and vertically fixed to the upper surface of the lower connecting plate 61 and the lower surface of the upper connecting plate 62; the bottom end of the nut 64 is fixed to the upper surface of the upper connecting plate 62 and its inner hole is communicated with the through hole; the lead screw 65 is threadedly connected in the nut 64 and its bottom end can pass through the through hole.

[0031] In some specific embodiments, the lifting mechanism 6 can further include two support strips 66 and a fixed strip 67. The two support strips 66 are arranged in parallel on opposite sides of the lead screw 65 and are fixed at the bottom ends to the outer top surface of the box 1. The fixed strip 67 is vertically fixed at the top ends of the two support strips 66 and has a through hole extending through the two ends in the middle. The top end of the lead screw 65 extends through the through hole.

[0032] In some specific embodiments, the lifting mechanism 6 can further include a handle 68 fixed to the top end of the lead screw 65 extending through the through hole.

[0033] In some specific embodiments, the impedance matching device 8 is electrically connected to the radio frequency power supply 7 through the 50Ω coaxial cable 11 and is electrically connected to the upper plate 5 and the lower plate 4 through the copper strip 12, respectively.

[0034] Specifically, the radio frequency power supply is an AG-2710 radio frequency power supply module, and the overall efficiency can reach more than 70%.

[0035] Specifically, the impedance matching device is an AM-2715 radio frequency automatic matching device.

[0036] In some specific embodiments, the box 1 can further include a plurality of lower plate fixing members 9 fixed at intervals on the inner bottom surface of the box 1, and the lower plate 4 is fixed at the top end of the plurality of lower plate fixing members 9.

[0037] In some specific embodiments, the box 1 can further include a plurality of upper plate fixing members 10 fixed on the plurality of lower plate fixing members 9, respectively, and the lower plate 4 is fixed on the plurality of upper plate fixing members 10.

[0038] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A radio frequency heating system with adjustable distance between positive and negative electrode plates, characterized in that , comprising: a box (1), a front door (2), a back door (3), a lower pole plate (4), an upper pole plate (5), a lifting mechanism (6) and a radio frequency power supply (7), The front end face and the rear end face of the box (1) are both provided with openings; the front door (2) and the back door (3) are respectively hinged at the opening of the front end face of the box (1) and the opening of the rear end face of the box (1); the lower pole plate (4) is fixed to the inner bottom surface of the box (1); the upper pole plate (5) is arranged above the lower pole plate (4) on the inner top of the box (1); the lifting mechanism (6) is fixed to the outer top of the box (1) and its lifting output end is fixed to the upper surface of the upper pole plate (5) through the top surface of the box (1); the radio frequency power supply (7) is located outside the box (1) and is electrically connected with the upper pole plate (5) and the lower pole plate (4) respectively; The lifting mechanism (6) comprises a lower connecting plate (61), an upper connecting plate (62), a plurality of sliding rods (63), a nut (64) and a lead screw (65), a plurality of sliding holes are formed in the top surface of the box (1); the lower connecting plate (61) is the lifting output end, and the lower connecting plate (61) is located inside the box (1) and is fixed in parallel to the upper surface of the upper pole plate (5); the upper connecting plate (62) is arranged on the outer top of the box (1) and is parallel to the lower connecting plate (61), and a through hole is formed in the middle part of the upper connecting plate and penetrates through the two lower end surfaces of the upper connecting plate; a plurality of sliding rods (63) are respectively and vertically fixed to the upper surface of the lower connecting plate (61) and the lower surface of the upper connecting plate (62) through a plurality of sliding holes; the bottom end of the nut (64) is fixed to the upper surface of the upper connecting plate (62) and its inner hole is communicated with the through hole; the lead screw (65) is threadedly connected in the nut (64) and its bottom end can pass through the through hole; The lifting mechanism (6) further comprises two support strips (66) and a fixed strip (67), the two support strips (66) are arranged in parallel on the opposite sides of the lead screw (65) and their bottom ends are fixed to the outer top surface of the box (1); the fixed strip (67) is vertically fixed at the top ends of the two support strips (66) and a through hole is formed in the middle part of the fixed strip (67) and penetrates through the two ends of the fixed strip (67); the top end of the lead screw (65) passes through the through hole; The lifting mechanism (6) further comprises a handle (68), and the handle (68) is fixed to the top end of the lead screw (65) passing through the through hole.

2. The RF heating system with adjustable distance between positive and negative plates according to claim 1, characterized in that, It further comprises an impedance matcher (8), and the impedance matcher (8) is electrically connected with the radio frequency power supply (7) through a 50Ω coaxial cable (11) and is electrically connected with the upper pole plate (5) and the lower pole plate (4) through a copper strip (12).

3. The RF heating system with adjustable distance between positive and negative plates according to claim 1, characterized in that, It further comprises a plurality of lower pole plate fixing members (9), and a plurality of lower pole plate fixing members (9) are fixed at intervals on the inner bottom surface of the box (1); the lower pole plate (4) is fixed to the top end of the plurality of lower pole plate fixing members (9).

4. The RF heating system with adjustable distance between positive and negative plates according to claim 3, characterized in that, A plurality of upper pole plate fixing members (10) are further included, and the plurality of upper pole plate fixing members (10) are respectively fixed on the plurality of lower pole plate fixing members (9); and the lower pole plate (4) is fixed on the plurality of upper pole plate fixing members (10).

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