Energy focusing ring device and gas stove comprising same

By creating a detachable connection between recesses and protrusions on the wall of the energy-concentrating ring, the problem of poor cleaning caused by the difficulty in disassembling the energy-concentrating ring is solved, achieving convenient disassembly and stable connection of the energy-concentrating ring, and improving the cleaning effect and heating efficiency.

CN224397859UActive Publication Date: 2026-06-23NINGBO FOTILE KITCHEN WARE CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
NINGBO FOTILE KITCHEN WARE CO LTD
Filing Date
2025-06-17
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

The energy-concentrating ring is difficult to disassemble, making deep cleaning impossible. Stubborn stains easily accumulate on the bottom of the energy-concentrating ring, resulting in poor cleaning performance.

Method used

A recessed part is made on the wall of the energy-concentrating ring body, and a protrusion on the bottom ring of the energy-concentrating ring is attached to it, so that they can be connected in a detachable manner, realizing convenient disassembly and deep cleaning of the bottom ring of the energy-concentrating ring.

Benefits of technology

It enables easy disassembly and deep cleaning of the bottom surface of the energy-concentrating ring, improving the cleaning effect and enhancing connection stability and heating efficiency.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224397859U_ABST
    Figure CN224397859U_ABST
Patent Text Reader

Abstract

The utility model provides a kind of energy-gathering ring device and gas stove comprising it, which comprises energy-gathering ring body and energy-gathering ring bottom ring;The energy-gathering ring body is provided with a plurality of recessed parts, and the bottom of the recessed part is provided with a placing surface;The energy-gathering ring bottom ring comprises a bottom ring body and a plurality of protruding parts, one end of the plurality of protruding parts is arranged on the bottom ring body and corresponds to the plurality of recessed parts respectively, the other end of the plurality of protruding parts is arranged outward along the direction close to the energy-gathering ring body, and the protruding part abuts on the placing surface.The gas stove comprises the energy-gathering ring device as above.The recessed part opened on the wall surface of the energy-gathering ring body can carry the protruding part arranged on the energy-gathering ring bottom ring, so that the energy-gathering ring bottom ring is connected to the energy-gathering ring body in a detachable manner, and then the energy-gathering ring bottom surface that is easy to contaminate stubborn dirt can be conveniently detached for deep cleaning, avoiding the problem of poor cleaning effect of the rigidly connected energy-gathering ring bottom surface.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This utility model relates to the field of gas stoves, and in particular to an energy-concentrating coil device and a gas stove including the same. Background Technology

[0002] In gas stoves, the heat-concentrating ring is a key efficiency-enhancing component, typically arranged in a ring around the burner flame. Its main function is to reduce the ineffective diffusion of flame heat to the surrounding environment through physical reflection and concentration of heat energy, thereby significantly improving thermal efficiency and saving fuel consumption.

[0003] However, during long-term use, the bottom surface of the energy-concentrating ring easily accumulates dirt. The main reason is that the bottom surface of the energy-concentrating ring is close to the high-temperature flame, and carbon black particles produced by the incomplete combustion of fuel (especially carbon-containing fuels such as liquefied petroleum gas and natural gas) will directly splash and adhere to its surface. Secondly, soup, grease, food residue, etc. that overflow during cooking will be carbonized and firmly adhere to the bottom surface of the energy-concentrating ring when baked at high temperatures.

[0004] For secure installation and to maintain energy-concentrating performance, the energy-concentrating ring is typically designed to be tightly embedded in a pre-drilled groove in the cooktop panel, or rigidly connected to the cooktop body using clips, screws, or other fasteners. This method of fixing makes disassembly of the energy-concentrating ring difficult. Without disassembly, soaking or deep cleaning is impossible. Users can only rely on surface wiping or simple rinsing, which has extremely limited effectiveness in cleaning stubborn stains that have been sintered onto the surface. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defect in the prior art that the energy-concentrating ring cannot be deeply cleaned due to the difficulty in disassembling it, and to provide an energy-concentrating ring device and a gas stove including it.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] This utility model discloses an energy-concentrating ring device, which includes an energy-concentrating ring body and an energy-concentrating ring bottom ring disposed within the energy-concentrating ring body;

[0008] The energy-concentrating ring body has multiple recesses on the wall surface facing the bottom ring of the energy-concentrating ring. The recesses are recessed downward from the top surface of the energy-concentrating ring body, and the recesses are recessed inward from the inner wall surface of the energy-concentrating ring body in a direction away from the bottom ring of the energy-concentrating ring. The bottom of the recesses is provided with a placement surface.

[0009] The energy-concentrating ring bottom ring includes a bottom ring body and multiple protrusions. One end of each of the multiple protrusions is disposed on the bottom ring body and corresponds to each of the multiple recesses. The other end of each of the multiple protrusions extends outward along the direction close to the energy-concentrating ring body, and the protrusions abut against the placement surface.

[0010] In this solution, the energy-concentrating ring device, through the above-mentioned configuration, has a recessed portion on the wall of the energy-concentrating ring body that can accommodate the protrusion on the bottom ring of the energy-concentrating ring, so that the bottom ring of the energy-concentrating ring is detachably connected to the energy-concentrating ring body. This allows the bottom surface of the energy-concentrating ring, which is prone to stubborn dirt, to be easily removed for deep cleaning, avoiding the problem of poor cleaning effect on the bottom surface of the rigidly connected energy-concentrating ring.

[0011] Preferably, the recess further includes sidewalls disposed on both sides of the protrusion and a rear wall facing the protrusion, the width between the two sidewalls being adapted to the width of the protrusion so that the two sides of the protrusion respectively abut against the two sidewalls of the recess.

[0012] In this design, matching the width of the protrusion with the distance between the two side walls of the recess can reduce the gap between the protrusion and each side wall, thereby reducing the space for the protrusion to move horizontally within the recess and thus improving the stability of the connection between the bottom ring of the energy-concentrating coil and the body of the energy-concentrating coil.

[0013] Preferably, the protrusion abuts against the end of the placement surface and simultaneously abuts against the rear wall surface of the recess.

[0014] In this design, the end of the protrusion abuts against the rear wall surface, which reduces the gap between the end of the protrusion and the rear wall surface, thereby reducing the space for the protrusion to move horizontally and vertically within the recess, and thus improving the stability of the connection between the bottom ring of the energy-concentrating coil and the body of the energy-concentrating coil.

[0015] Preferably, the end of the protrusion that abuts against the placement surface extends upward and is provided with an abutting foot, the abutting foot abutting against the rear wall surface of the recess.

[0016] In this design, by setting abutment feet, the contact area between the protruding end and the rear wall surface can be increased, thereby further improving the stability of the connection between the bottom ring of the energy-concentrating coil and the body of the energy-concentrating coil.

[0017] Preferably, the plurality of recesses are equidistantly spaced along the circumference of the energy-concentrating ring body.

[0018] In this design, the circumferentially equidistant recesses can provide more support points for the bottom ring of the shaped charge coil, thereby further improving the stability of the connection between the bottom ring and the body of the shaped charge coil.

[0019] Preferably, the energy-concentrating ring device further includes a plurality of support legs, which are disposed on the top of the energy-concentrating ring body. The bottom ring of the energy-concentrating ring also includes a plurality of through holes, which are respectively aligned with the projections of the support legs onto the bottom ring body, so that the bottom ring of the energy-concentrating ring passes through the multiple through holes and the multiple support legs and is placed in the energy-concentrating ring body.

[0020] In this design, the support legs are used to support the cookware. By providing through holes on the bottom ring of the energy-concentrating coil that allow the support legs to pass through, the possibility of interference between the bottom ring and the support legs during installation is reduced, thereby further improving the ease of installation of the bottom ring.

[0021] Preferably, the energy-concentrating ring device further includes multiple support legs, which are disposed on the top of the energy-concentrating ring body. The bottom ring of the energy-concentrating ring also includes a fire-resistant plate, one end of which is connected to the bottom ring body, and the other end of which extends along the support legs toward the center of the bottom ring body.

[0022] In this design, the fire-resistant plate positioned along the extension direction of the support legs forms a physical isolation zone, i.e., a fire-resistant zone, preventing flames from directly heating the support legs and avoiding heat loss into the air after being absorbed by the legs. This improves heating efficiency and directs more heat energy to the bottom of the pot.

[0023] Preferably, the width of the fire-resistant plate gradually decreases from the support leg to the center of the bottom ring body, and the height of the end of the fire-resistant plate near the center of the bottom ring body is higher than the height of the end of the fire-resistant plate near the support leg.

[0024] In this design, the gradually decreasing size of the flame shield ensures that the flame-shielding zone becomes smaller closer to the center of the bottom ring, because the support legs do not extend to the center of the bottom ring, thus improving the heating efficiency of the pot bottom at the center of the bottom ring. Furthermore, regardless of whether the outer surface of the burner is inclined, the end of the flame shield closer to the center of the bottom ring being higher than the other end allows the flame shield to partially block the flame, forming a flame-shielding zone, thus improving the versatility of this energy-concentrating ring device.

[0025] Preferably, the bottom ring body has a through hole at its center for mounting the burner, and the inner and outer edges of the bottom ring body extend towards the burner and the energy-concentrating ring body in the horizontal direction and are arranged in a flat ring shape.

[0026] In this design, the flat, annular bottom ring can cover a larger area between the burner and the energy-concentrating ring body, reducing the possibility of dirt falling from the gap between the bottom ring of the energy-concentrating ring and the burner or the energy-concentrating ring body.

[0027] This utility model also discloses a gas stove, which includes the energy-concentrating ring device as described above.

[0028] In this solution, through the above-mentioned configuration, the recessed portion on the wall of the energy-concentrating ring body can accommodate the protrusion on the bottom ring of the energy-concentrating ring, so that the bottom ring of the energy-concentrating ring is detachably connected to the energy-concentrating ring body. This allows the bottom surface of the energy-concentrating ring, which is prone to stubborn dirt, to be easily removed for deep cleaning, avoiding the problem of poor cleaning effect on the bottom surface of the rigidly connected energy-concentrating ring.

[0029] The positive and progressive effects of this utility model are as follows:

[0030] The energy-concentrating ring device and the gas stove including it, through the above-mentioned configuration, allow the recessed portion on the wall of the energy-concentrating ring body to accommodate the protrusion on the bottom ring of the energy-concentrating ring, so that the bottom ring of the energy-concentrating ring is detachably connected to the energy-concentrating ring body. This allows the bottom surface of the energy-concentrating ring, which is prone to stubborn dirt, to be easily removed for deep cleaning, avoiding the problem of poor cleaning effect on the bottom surface of the rigidly connected energy-concentrating ring. Attached Figure Description

[0031] Figure 1 This is a perspective view of the energy-concentrating coil device according to an embodiment of the present utility model.

[0032] Figure 2 This is a perspective view of the bottom ring of the energy-concentrating coil according to an embodiment of the present invention.

[0033] Figure 3 This is a perspective view of the energy-concentrating coil body according to an embodiment of the present utility model.

[0034] Figure 4 for Figure 3 A magnified view of a portion of region A in the middle.

[0035] Explanation of reference numerals in the attached figures:

[0036] Concentrating Coil Device 1000

[0037] Energy Concentration Array Body 1

[0038] Top surface 101

[0039] Inner wall surface 102

[0040] Recess 103

[0041] Side wall 1031

[0042] Rear wall 1032

[0043] Placement surface 1033

[0044] Energy Concentration Circle Bottom Circle 2

[0045] Bottom ring body 201

[0046] Protrusion 202

[0047] Through hole 203

[0048] 204 connecting feet

[0049] Fireproof sheet 205

[0050] Burner 3

[0051] 4-leg support

[0052] Through hole 5 Detailed Implementation

[0053] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0054] like Figures 1-4 As shown, this embodiment provides a concentrating ring device 1000, which includes a concentrating ring body 1 and a concentrating ring bottom ring 2 disposed within the concentrating ring body 1.

[0055] like Figure 1 and Figure 3 As shown, the energy-concentrating ring body 1 is annular, and the energy-concentrating ring bottom ring 2 is located at the center of the annulus of the energy-concentrating ring body 1. The wall surface of the energy-concentrating ring body 1 facing the energy-concentrating ring bottom ring 2 includes a top surface 101 and an inner wall surface 102. The height of the top surface 101 gradually decreases from the outer edge to the inner edge, and a recess 103 is provided on the top surface 101. The recess 103 can be located at different heights on the top surface 101. Preferably, the recess 103 is located at the inner edge of the top surface 101, because this allows the cavity enclosed by the energy-concentrating ring body 1 to be larger, resulting in a better energy-concentrating effect.

[0056] There are multiple recesses 103, such as Figure 1 and Figure 3 As shown, there are four recesses 103, but this number is only illustrative and can be adjusted by those skilled in the art according to actual needs. This embodiment does not limit the number.

[0057] like Figure 4 As shown, the four recesses 103 are recessed downward from the top surface 101 of the energy-concentrating ring body 1, and the recesses 103 are recessed inward from the inner wall surface 102 of the energy-concentrating ring body 1 in a direction away from the bottom ring 2 of the energy-concentrating ring. The recesses 103 include the side wall surfaces 1031 on both sides, the rear wall surface 1032 and the placement surface 1033 at the bottom.

[0058] like Figure 2As shown, the energy-concentrating ring bottom ring 2 includes a bottom ring body 201 and four protrusions 202 corresponding to the recesses 103. One end of each of the four protrusions 202 is disposed on the bottom ring body 201 and corresponds to the four recesses 103 respectively. The other end of each of the four protrusions 202 extends outward along the direction close to the energy-concentrating ring body 1, and the protrusions 202 abut against the placement surface 1033.

[0059] The phrase "protrusion 202 abuts against placement surface 1033" means that protrusion 202 is placed on placement surface 1033 under the action of gravity. The contact between protrusion 202 and placement surface 1033 can be released under the action of force opposite to gravity, thereby realizing a detachable connection between protrusion 202 and placement surface 1033.

[0060] Thus, through the above-described configuration, the recess 103 on the wall of the energy-concentrating ring 1 can accommodate the protrusion 202 on the bottom ring 2 of the energy-concentrating ring, allowing the bottom ring 2 to be detachably connected to the energy-concentrating ring 1. This makes it easy to remove the bottom surface of the energy-concentrating ring, which is prone to stubborn dirt, for deep cleaning, avoiding the problem of poor cleaning effect on the bottom surface of the rigidly connected energy-concentrating ring.

[0061] In this embodiment, as Figure 2 As shown, the bottom ring body 201 has a through hole 203 at its center for mounting the burner 3. In the horizontal direction, the inner and outer edges of the bottom ring body 201 extend towards the burner 3 and the energy-concentrating ring body 1 respectively, forming a flat ring shape. The flat, annular bottom ring body 201 can cover a larger area between the burner 3 and the energy-concentrating ring body 1, reducing the possibility of dirt falling from the gap between the bottom ring 2 and the burner 3 or the energy-concentrating ring body 1.

[0062] In this embodiment, the side wall surface 1031 of the recessed portion 103 is a wall surface disposed on both sides of the protrusion 202 abutting the placement surface 1033, and the rear wall surface 1032 is a wall surface directly opposite the protrusion 202 abutting the placement surface 1033.

[0063] Furthermore, the width between the two sidewalls 1031 is adapted to the width of the protrusion 202 so that the two sides of the protrusion 202 respectively abut against the two sidewalls 1031 of the recess 103. Adapting the width of the protrusion 202 to the distance between the two sidewalls of the recess 103 reduces the gap between the protrusion 202 and each sidewall 1031, thereby reducing the space for horizontal lateral movement of the protrusion 202 within the recess 103, and thus improving the stability of the connection between the energy-concentrating coil bottom ring 2 and the energy-concentrating coil body 1.

[0064] Furthermore, the protrusion 202 abuts against the end of the placement surface 1033 and simultaneously abuts against the rear wall surface 1032 of the recess 103. The end of the protrusion 202 abutting against the rear wall surface 1032 can reduce the gap between the end of the protrusion 202 and the rear wall surface 1032, thereby reducing the space for the protrusion 202 to move horizontally and vertically within the recess 103, and thus improving the stability of the connection between the bottom ring 2 of the energy-concentrating coil and the body 1 of the energy-concentrating coil.

[0065] Furthermore, such as Figure 2 As shown, an abutment foot 204 extends upward from the end of the protrusion 202 that abuts against the placement surface 1033, and the abutment foot 204 abuts against the rear wall surface 1032 of the recess 103. Preferably, the abutment foot 204 can be bent to adjust its angle, so that the abutment foot 204 fits more closely to the rear wall surface 1032. By providing the abutment foot 204, the contact area between the end of the protrusion 202 and the rear wall surface 1032 can be increased, thereby further improving the stability of the connection between the energy-concentrating coil bottom ring 2 and the energy-concentrating coil body 1.

[0066] Furthermore, multiple recesses 103 are equidistantly spaced along the circumference of the energy-concentrating ring body 1. The equidistantly spaced recesses 103 can provide more support points for the energy-concentrating ring bottom ring 2, thereby further improving the stability of the connection between the energy-concentrating ring bottom ring 2 and the energy-concentrating ring body 1.

[0067] In this embodiment, as Figure 1 and Figure 3 As shown, four recesses 103 are respectively arranged at 90-degree intervals along the circumference of the energy-concentrating ring body 1. However, this number and arrangement angle are only schematic representations, and those skilled in the art can adjust them according to actual needs. This embodiment does not limit the scope of the invention.

[0068] Specifically, the energy-concentrating ring device 1000 also includes multiple legs 4, which are disposed on the top of the energy-concentrating ring body 1. The energy-concentrating ring bottom ring 2 also includes multiple through holes 5, which are respectively aligned with the projections of the multiple legs 4 onto the bottom ring body 201, so that the energy-concentrating ring bottom ring 2 passes through the multiple through holes 5 and the multiple legs 4 and is placed inside the energy-concentrating ring body 1.

[0069] Thus, the support leg 4 is used to support the pot. By setting a through hole 5 on the bottom ring 2 of the energy-concentrating ring so that the support leg 4 can pass through, the possibility of interference between the bottom ring 2 of the energy-concentrating ring and the support leg 4 during installation is reduced, thereby further improving the ease of installation of the bottom ring 2 of the energy-concentrating ring.

[0070] In this embodiment, as Figure 1 As shown, there are four legs 4 and four through holes 5, but this number is only for illustrative purposes. Those skilled in the art can adjust it according to actual needs. This embodiment does not limit it.

[0071] Furthermore, the recess 103 can be located below the support leg 4 or between two adjacent support legs 4.

[0072] In this embodiment, as Figure 1 As shown, the recess 103 is located below the support leg 4, that is, the through hole 5 is located on the protrusion 202, so that each protrusion 202 is transformed from a whole strip plate into two separate narrow plates under the action of a through hole 5.

[0073] Specifically, the energy-concentrating ring bottom ring 2 also includes a fireproof plate 205. One end of the fireproof plate 205 is connected to the bottom ring body 201, and the other end of the fireproof plate 205 extends along the support leg 4 toward the center of the bottom ring body 201.

[0074] Thus, the fire-resistant plate 205 provided in the extension direction of the support leg 4 can form a physical isolation zone, i.e., a fire-resistant zone, so that the flame avoids the position of the support leg 4. This structure prevents the flame from directly heating the support leg 4 and avoids the heat being absorbed by the support leg 4 and dissipated into the air, thereby improving heating efficiency and directing more heat energy to the bottom of the pot.

[0075] In this embodiment, as Figure 1 As shown, the number of fireproof plates 205 corresponds to the number of support legs 4, both being four.

[0076] Furthermore, the width of the fire-resistant plate 205 gradually decreases from the support leg 4 to the center of the bottom ring body 201. The gradually decreasing width of the fire-resistant plate 205 ensures that the formed fire-resistant zone is smaller closer to the center of the bottom ring body 201, because the support leg 4 does not extend to the center of the bottom ring body 201, thus improving the heating efficiency of the pot bottom at the center of the bottom ring body 201.

[0077] Furthermore, the height of the end of the fire-resistant plate 205 near the center of the bottom ring body 201 is higher than the height of the end of the fire-resistant plate 205 near the support leg 4. Regardless of whether the outer surface of the burner 3 has an inclination, the fact that the end of the fire-resistant plate 205 near the center of the bottom ring body 201 is higher than the other end allows the fire-resistant plate 205 to block part of the flame and form a fire-resistant zone, thus improving the applicability of the energy-concentrating ring device 1000.

[0078] This embodiment also provides a gas stove, which includes the energy-concentrating coil device 1000 as described above.

[0079] Thus, through the above-mentioned arrangement, the recess 103 opened on the wall of the energy ring body 1 can accommodate the protrusion 202 provided on the bottom ring 2 of the energy ring, so that the bottom ring 2 of the energy ring is detachably connected to the energy ring body 1. This allows the bottom surface of the energy ring, which is prone to stubborn dirt, to be easily removed for deep cleaning, avoiding the problem of poor cleaning effect of the bottom surface of the rigidly connected energy ring.

[0080] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A concentrating coil device, characterized in that, The energy-concentrating ring device includes an energy-concentrating ring body and an energy-concentrating ring bottom ring disposed within the energy-concentrating ring body; The energy-concentrating ring body has multiple recesses on the wall surface facing the bottom ring of the energy-concentrating ring. The recesses are recessed downward from the top surface of the energy-concentrating ring body, and the recesses are recessed inward from the inner wall surface of the energy-concentrating ring body in a direction away from the bottom ring of the energy-concentrating ring. The bottom of the recesses is provided with a placement surface. The energy-concentrating ring bottom ring includes a bottom ring body and multiple protrusions. One end of each of the multiple protrusions is disposed on the bottom ring body and corresponds to each of the multiple recesses. The other end of each of the multiple protrusions extends outward along the direction close to the energy-concentrating ring body, and the protrusions abut against the placement surface.

2. The energy-concentrating coil device as described in claim 1, characterized in that, The recessed portion further includes side wall surfaces disposed on both sides of the protrusion and a rear wall surface facing the protrusion. The width between the two side wall surfaces is adapted to the width of the protrusion so that the two sides of the protrusion respectively abut against the two side wall surfaces of the recessed portion.

3. The energy-concentrating coil device as described in claim 2, characterized in that, The protrusion abuts against the end of the placement surface and simultaneously abuts against the rear wall surface of the recess.

4. The energy-concentrating coil device as described in claim 3, characterized in that, The protrusion abuts against the end of the placement surface and extends upward to form an abutting foot, which abuts against the rear wall surface of the recess.

5. The energy-concentrating coil device as described in claim 1, characterized in that, The plurality of the recesses are equidistantly spaced along the circumference of the energy-concentrating ring body.

6. The energy-concentrating coil device as described in claim 1, characterized in that, The energy-concentrating ring device also includes multiple support legs, which are disposed on the top of the energy-concentrating ring body. The bottom ring of the energy-concentrating ring also includes multiple through holes, which are respectively aligned with the projections of the multiple support legs onto the bottom ring body, so that the bottom ring of the energy-concentrating ring passes through the multiple through holes and the multiple support legs and is placed in the energy-concentrating ring body.

7. The energy-concentrating coil device as described in claim 1, characterized in that, The energy-concentrating ring device also includes multiple support legs, which are disposed on the top of the energy-concentrating ring body. The bottom ring of the energy-concentrating ring also includes a fire-resistant plate, one end of which is connected to the bottom ring body, and the other end of which extends along the support legs toward the center of the bottom ring body.

8. The energy-concentrating coil device as described in claim 7, characterized in that, The width of the fireproof plate gradually decreases from the support leg to the center of the bottom ring body, and the height of the end of the fireproof plate near the center of the bottom ring body is higher than the height of the end of the fireproof plate near the support leg.

9. The energy-concentrating coil device as described in claim 1, characterized in that, The bottom ring body has a through hole at its center for mounting the burner. The inner and outer edges of the bottom ring body extend towards the burner and the energy-concentrating ring body in the horizontal direction and are arranged in a flat ring shape.

10. A gas stove, characterized in that, It includes the energy-concentrating coil device as described in any one of claims 1-9.