Automatic vaporization device for liquid fuel ignition and furnace end using same

Abstract

The utility model discloses a liquid fuel ignition automatic vaporization device and a furnace end using the same. The liquid fuel ignition automatic vaporization device comprises an ignition plug, a vaporization core, an inner housing and an outer housing, the vaporization core comprises a cylindrical body, one end of the cylindrical body is provided with a vaporization cavity, the ignition plug is installed in the vaporization cavity, the outer side of the cylindrical body is provided with at least one inner fire hole which is internally and externally communicated, and an oil pipe is arranged outside the cylindrical body; the inner cover shell comprises a shell body with one end open, the shell body is arranged outside the vaporization core in a sleeving mode, a gap is reserved between the vaporization core and the shell body and forms an air inlet channel, a positioning hole is formed in the outer side of the shell body, and the positioning hole is communicated with the inner fire hole in a sealed mode; the outer housing comprises a top cover with an opening at one end, and a plurality of outer fire holes communicated inside and outside are arranged around the side wall of the top cover. According to the use environment, the device can adopt various fuel supply modes, is concentrated in heat, does not need to ignite by using an ignition needle, and is low in noise, low in energy consumption, reasonable in design, compact in structure, small in occupied space, not easy to damage, simple to disassemble and assemble and easy to maintain.

Description

TECHNICAL FIELD

[0001] The utility model relates to commercial kitchen range technical field, concretely relates to a kind of liquid fuel ignition automatic vaporization device and the burner tip of using the device. BACKGROUND

[0002] In prior art, when burning, commercial range using liquid fuel needs to use oil pump to supply fuel, and needs to use special spray head to combine oil pump to atomize fuel, the noise generated by high-pressure oil pump is large during work, the noise of burner tip is also large during burning, and the energy consumption of using oil pump is high, easy to damage, and the spray head is easy to block; Liquid fuel mostly needs heating device to preheat fuel before ignition, and ignition needle is used to ignite the burning of burner tip, and the ignition needle is easy to damage, in view of the various shortcomings of the above prior art, therefore, a new type of liquid fuel burner tip breaking conventional working mode is needed. SUMMARY

[0003] The utility model discloses a kind of liquid fuel ignition automatic vaporization device and the burner tip of using the device, to solve the problems of the prior art, such as oil pump noise, easy to damage, spray head atomization is easy to block, work, energy consumption is high, and the ignition needle used is easy to damage.

[0004] Its technical scheme is: a kind of liquid fuel ignition automatic vaporization device, including ignition plug, vaporization core, inner cover shell, outer cover shell;The vaporization core includes columnar body, the one end of the columnar body is provided with vaporization cavity, and the heating end of ignition plug is installed in the vaporization cavity, at least one inner fire hole that is communicated between inside and outside is arranged on the outside of the columnar body, the oil pipe is arranged on the outside of the columnar body, the oil pipe is communicated with vaporization cavity, and the vaporization hole that is communicated between vaporization cavity and outside is arranged on the columnar body;The inner cover shell includes the shell that one end is opened, the shell is set in the outside of vaporization core, and the gap is left between the vaporization core and the shell, and the gap forms air inlet channel, and the positioning hole is opened on the outside of shell, and the positioning hole is sealed and communicated with the inner fire hole;The outer cover shell includes the top cover that one end is opened, and a plurality of outer fire holes that are communicated between inside and outside are arranged on the side wall around top cover, and the bottom of inner cover shell is tightly combined with the inner wall of top cover, and the gap is arranged between the upper portion of inner cover shell and the inner wall of outer cover shell.

[0005] Further optimization is carried out on the basis of the above technical scheme, the columnar body includes upper column and lower column, the ignition plug is installed in the lower column, the oil pipe is arranged on the upper portion or one side of the upper column, and the width of the lower column is greater than the width of the upper column.

[0006] Further optimization is carried out on the basis of the above technical scheme, the vaporization hole is vertically arranged on the top of the upper column, the oil pipe is arranged on one side of the upper column, and the oil pipe is communicated with the vaporization cavity after being connected with the vaporization hole in parallel.

[0007] Further optimization based on the above technical solutions, the inner cover also includes the bottom of the shell set in the chassis, the width of the chassis is greater than the width of the shell, the top cover is placed on the upper part of the chassis, the shell is provided with at least one plane, and the positioning hole is arranged on the plane.

[0008] Further optimization based on the above technical solutions, the outer part of the lower column is a regular hexagonal prism, the outer side and the inner side of the shell are respectively provided with three planes, each of the planes is provided with a cover side air hole communicating with the inside and the outside, the three planes of the inner side of the shell are closely combined with the three planes of the regular hexagonal prism, the other three planes of the regular hexagonal prism form the air inlet between the shell, and the oil pipe extends from the upper part of the upper column to the lower part of the lower column through one of the air inlets.

[0009] Further optimization based on the above technical solutions, the cover side air hole is arranged on the upper part of the inner cover, the positions and the number of the cover side air holes on each plane are the same, and the top of the shell is provided with a cover upper air hole communicating with the inside and the outside.

[0010] Further optimization based on the above technical solutions, the inner fire hole and the positioning hole are fixed through the fixed fire ring, the fixed fire ring is a hollow structure, the inner fire hole is provided with an internal thread, one end of the fixed fire ring is provided with an external thread, the fixed fire ring is connected with the inner fire hole through the threads, and the diameter of the other end of the fixed fire ring is greater than that of the positioning hole.

[0011] Further optimization based on the above technical solutions, the outer side edge of the chassis is folded upwards, the extension forms an annular groove with the upper part of the chassis, a plurality of vaporization fins are uniformly distributed around the outer side of the outer cover, the outer fire hole is arranged between one or more vaporization fins, and the vaporization fin is placed in the annular groove.

[0012] A furnace end comprises a liquid fuel ignition automatic vaporization device, an upper seat and a base, the upper seat is surrounded by a side wall, the top of the upper seat side wall is bent outward and then horizontally extended, the bottom of the upper seat side wall is bent inward and then horizontally extended, a upper seat port is left at the center of the bottom of the upper seat, the liquid fuel ignition automatic vaporization device is installed at the bottom of the upper seat, the base is surrounded by a side wall, the top end of the base side wall is connected with the extension of the top of the upper seat, the bottom of the base side wall is bent inward and then horizontally extended, a bottom air inlet is left at the center of the bottom of the base, and the ignition plug and the oil pipe respectively penetrate the upper seat port and the bottom air inlet.

[0013] On the basis of further optimizing the above technical scheme, a plurality of upper seat side air holes communicating between the inside and the outside are arranged around the upper seat, and a plurality of upper seat upper air holes communicating between the upper and the lower are arranged on the horizontal plane where the upper seat top extends; a positioning groove is formed at the center position of the bottom of the bottom disc, a protruding positioning ring is arranged at the upper edge of the upper seat mouth, and the positioning ring is installed in the positioning groove; a plurality of protruding screw holes are arranged on the bottom surface of the outer shell, the protruding screw holes are pressed on the upper surface of the upper seat bottom, a screw is arranged to penetrate through the upper seat bottom, the screw is fixed in the protruding screw hole, and a gap is arranged between the outer side of the annular groove and the inner wall of the upper seat.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The device has low energy consumption and low noise, can adopt various fuel supply modes according to the use environment, can select to use an oil pump or not use the oil pump, the height of the oil tank is higher than the furnace head when the oil pump is not used, liquid fuel flows into the vaporization cavity through the oil pipe, the liquid fuel is vaporized and ignited by the heating ignition plug at this time, the flame is sprayed out after entering the outer fire hole from the inner fire hole, the heat is concentrated, the energy consumption is low, the furnace head body does not need to be continuously electrically heated, and the use of the ignition needle is saved; the heat preservation effect is good, according to experiments, the residual heat can continue to burn when oil and air are supplied again within a certain period after the fire is turned off, and the ignition plug is not needed; the outer shell, the inner shell, the ignition core and the ignition plug are closely combined, the design is reasonable, the structure is compact, the occupied space is small, the metal structural parts are not easy to be damaged; the outer shell and the inner shell are fixedly connected through threads, the inner shell and the ignition core are fixedly connected through the fixed fire ring, and the device is simple to disassemble and assemble and easy to maintain; the ignition plug adopts a direct current 24V voltage, is high in use safety and high in practicality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective view of the liquid fuel ignition automatic vaporization device of the utility model;

[0017] Figure 2 It is a perspective view of the liquid fuel ignition automatic vaporization device of the utility model (different from the perspective view in the figure); Figure 1

[0018] Figure 3 It is a bottom view of the liquid fuel ignition automatic vaporization device of the utility model;

[0019] Figure 4 It is an explosion view of the liquid fuel ignition automatic vaporization device of the utility model;

[0020] Figure 5 It is a perspective view of the inner shell in the utility model;

[0021] Figure 6 It is a perspective view of the vaporization core in the utility model; ​

[0022] Figure 7 is a sectional view of the vaporization core in the utility model;

[0023] Figure 8 is a bottom view of the vaporization core in the utility model;

[0024] Figure 9 is a perspective view of the furnace end in the utility model;

[0025] Figure 10 is a sectional view of the furnace end in the utility model;

[0026] Figure 11 is a perspective sectional view of the furnace end in the utility model;

[0027] Figure 12 is an explosion view of the furnace end in the utility model.

[0028] 1, outer cover, 11, top cover, 12, outer fire hole, 13, vaporization fin;

[0029] 2, inner cover, 20, air inlet, 21, shell, 22, positioning hole, 23, cover shell side air hole, 24, cover shell upper air hole, 25, bottom disc, 26, positioning groove, 27, screw hole, 28, annular groove;

[0030] 3, vaporization core, 30, vaporization cavity, 31, lower column, 32, inner fire hole, 33, upper column, 34, vaporization hole, 35, oil pipe;

[0031] 4, fixed fire circle;

[0032] 5, ignition plug;

[0033] 6, upper seat, 60, upper seat mouth, 61, positioning ring, 62, upper seat side air hole, 63, upper seat upper air hole, 64, combustion chamber;

[0034] 7, base, 70, bottom air inlet. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0036] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0037] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0038] Referring to Figures 1-12 A liquid fuel ignition automatic vaporization device, comprising an ignition plug 5, a vaporization core 3, an inner cover 2 and an outer cover 1, the vaporization core 3 comprises a columnar body composed of an upper column 33 and a lower column 31, one end of the columnar body is provided with a vaporization cavity 30, an inner thread is arranged in the vaporization cavity 30, the ignition plug 5 is installed in the vaporization cavity 30 of the lower column 31 through threaded connection, the ignition plug 5 is a silicon nitride ignition plug, direct current 24V voltage is used for power supply, it is safe and reliable in use, low in energy consumption, the heating temperature can reach 1000 DEG C in a short time, and the high temperature generated by the ignition plug 5 meets the demand of liquid fuel vaporization; at least one inner fire hole 32 communicating between the inside and the outside is arranged on the outer side of the lower column 31, an oil pipe 35 is arranged on the upper part or one side of the upper column 33, the oil pipe 35 communicates with the vaporization cavity 30, and a vaporization hole 34 communicating between the vaporization cavity 30 and the outside is arranged on the columnar body; the inner cover 2 comprises a shell 21 with one end being open, the shell 21 is arranged outside the vaporization core 3, a gap is formed between the vaporization core 3 and the shell 21, the gap forms an air inlet channel 20, a positioning hole 22 is formed on the outer side of the shell 21, and the positioning hole 22 is in sealed communication with the inner fire hole 32; the outer cover 1 comprises a top cover 11 with one end being open, a plurality of outer fire holes 12 communicating between the inside and the outside are arranged on the side wall surrounding the top cover 11, and a gap is formed between the upper part of the inner cover 2 and the inner wall of the outer cover 1; the vaporization hole 34 is vertically arranged on the top of the upper column 33, the oil pipe 35 is arranged on one side of the upper column 33, the oil pipe 35 and the vaporization hole 34 are in parallel connection and then communicate with the vaporization cavity 30, the oil pipe 35 and the vaporization hole 34 form a tee structure, air enters the vaporization cavity 30 through the vaporization hole 34, and liquid fuel enters the vaporization cavity 30 at the same time, and the liquid fuel is mixed with air after being vaporized.

[0039] The inner fire hole 32 is fixed with the positioning hole 22 through the fixed fire ring 4. The fixed fire ring 4 is a hollow structure. The inner fire hole 32 is provided with an internal thread. One end of the fixed fire ring 4 is provided with an external thread. The fixed fire ring 4 is connected with the inner fire hole 32 through the thread. The other end of the fixed fire ring 4 is provided with a flange. When the unburned liquid flows out of the hole of the fixed fire ring 4, the flange can block the liquid from flowing back into the positioning hole 22. The flange can be provided with a regular hexagon, which is convenient for the wrench to disassemble and assemble.

[0040] The bottom plate is folded and extended upwards. The extension is provided with an annular groove 28. A plurality of vaporization fins 13 are uniformly distributed around the outer side of the outer shell 1. The outer fire hole 12 is arranged between one or more vaporization fins 13. The vaporization fin 13 is placed in the annular groove 28. The vaporization fin 13 is tightly connected with the annular groove 28. When the outer fire hole 12 sprays the flame to the vaporization fin 13, the vaporization fin 13 is in a high-temperature state for a long time. When the combustion is not in the normal working temperature, if the unburned liquid fuel falls into the annular groove 28 or the vaporization fin 13, the high temperature of the vaporization fin 13 can vaporize and burn the liquid fuel. The outer shell 1 is provided with a vaporization fin 13. The air hole 72 of the upper seat blows the air to the flame. The flame burns at the position of the vaporization fin 13. The temperature of the vaporization device is improved, so that the vaporization is more sufficient.

[0041] The inner shell 2 further comprises a bottom plate 25 arranged at the bottom of the shell 21. The width of the bottom plate 25 is greater than the width of the shell 21. The top cover 11 is arranged at the upper part of the bottom plate 25. The outer part of the lower column 31 is a regular hexagonal prism. The upper column 33 can be provided with a cylindrical shape. The outer side and the inner side of the shell 21 are respectively provided with three planes. Each plane is provided with a positioning hole 22. The three planes on the inner side of the shell 21 are tightly combined with the three planes of the regular hexagonal prism. Among the six planes of the regular hexagonal prism, three planes are combined with the shell 21. The remaining three planes form the air inlet 20 (as shown in the figure) which is distributed at equal intervals. Figure 3As shown in the figure, the oil pipe 35 extends from the upper part of the upper column 33 to the lower part of the lower column 31 through one of the air inlets 20, and the inner and outer side air holes 23 are arranged on each plane of the shell 21, the positions and numbers of the side air holes 23 on each plane are the same, and the side air holes 23 are used to blow air to the inner wall of the top cover 11 when only one or two of the three fixed flame rings 4 blow out flames, at this time, the air is blown out from the holes on the three planes, and when the air meets the circular inner wall of the top cover 11, the rotating air is formed in the top cover 11, and the flame is forced to blow along the inner wall of the top cover 11 to the fixed flame ring, that is, the flame blown out from the fixed flame ring 4 is assisted to burn, and the fixed flame ring 4 that is not ignited can also be ignited; the inner and outer side air holes 24 are arranged on the top of the shell 21, and a part of the air is blown to the top cover through the side air holes, which reduces the temperature of the top cover 11 and greatly prolongs the service life of the outer shell 1.

[0042] A burner head comprises the liquid fuel ignition automatic vaporization device described above, an upper seat 6 and a bottom seat 7, the upper seat 6 is surrounded by a side wall, the top of the side wall is bent outward and then extends horizontally, the bottom of the side wall is bent inward and then extends horizontally, and the center of the bottom of the upper seat 6 is provided with an upper seat opening 60, the liquid fuel ignition automatic vaporization device is installed on the bottom of the upper seat 6, the bottom seat 7 is surrounded by a side wall, the top of the side wall is connected with the extension of the top of the upper seat 6, the bottom of the side wall is bent inward and then extends horizontally, and the center of the bottom of the bottom seat 7 is provided with a bottom air inlet 70, the ignition plug 5 and the oil pipe 35 respectively penetrate the upper seat opening 60 and the bottom air inlet 70; a plurality of inner and outer side air holes 62 are arranged around the upper seat 6, a plurality of upper and lower air holes 63 are arranged on the horizontal plane of the extension of the top of the upper seat 6, air is blown to the burning flame to assist combustion through the upper air holes 63 and the side air holes 62; a positioning groove 26 is arranged in the center of the bottom of the bottom plate 25, a protruding positioning ring 61 is arranged on the upper edge of the upper seat opening 60, the positioning ring 61 is installed in the positioning groove 26, the positioning groove 26 and the positioning ring 61 are mutually buckled and installed, which facilitates installation and positioning and makes the connection part between the inner shell 2 and the upper seat sealed tightly, a plurality of protruding screw holes 27 are arranged on the surface of the bottom of the outer shell 1, the protruding screw holes 27 are pressed on the upper surface of the bottom of the upper seat, screws are arranged through the bottom of the bottom seat and fixed in the protruding screw holes 27, and a gap is arranged between the outer side of the inner shell 2 and the inner wall of the upper seat 6, which reduces the contact area of the upper seat 6 and the vaporization device, reduces the heat transferred from the vaporization device to the upper seat 6, and prolongs the service life of the upper seat 6.

[0043] When the stove works, the fan is opened, and part of the air enters the space between the base 7 and the upper seat 6 through the bottom air inlet 70, and then is sprayed into the combustion chamber 64 through the upper seat side air hole 62, and the upper seat upper air hole 63 sprays upward for combustion flame; another part passes through the bottom of the ignition plug 5 upward, enters the air inlet 20 through the upper seat air inlet 60, and then enters the space between the inner cover 2 and the vaporization core 3 through the air inlet 20, part of which is blown into the upper space through the cover upper air hole 24, and another part is blown into the space between the outer cover 1 and the inner cover 2 through the cover side air hole 23, and still another part is blown into the vaporization cavity 30 through the vaporization hole 34, and then enters the space between the outer cover 1 and the inner cover 2 through the fixed fire ring 4, and finally is sprayed out through the outer fire hole 12; the ignition plug 5 is heated by electricity, and when the temperature reaches the preset value or the power-on time is set, the liquid fuel is supplied, the liquid fuel enters the vaporization hole 34 through the oil pipe 35, the liquid fuel flows to the ignition plug 5, the high temperature vaporizes the liquid fuel, and then the mixed gas is formed after mixing with the air, and the liquid fuel after vaporization is ignited by the high-temperature ignition plug 5, the flame is sprayed into the space between the outer cover 1 and the inner cover 2 through the fixed fire ring 4, and finally is sprayed out through the outer fire hole 12. After the flame is ignited, the body can be heated by the heat generated by combustion, the liquid fuel is vaporized in the vaporization cavity 30 through the oil pipe 35 and continues to burn, and at this time, the ignition plug 5 does not need to be continuously heated.

[0044] The unmentioned structures and connection relationships are all common knowledge. The actual size and connection relationship can be seen from the drawings, and under the condition that the proportion is unchanged, the size and structure of the slight changes can be adjusted according to the actual use condition according to the drawings.

[0045] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the technical field can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A liquid fuel auto-ignition vaporizing device, characterized by: The application relates to a cigarette lighter, which comprises an ignition plug, a vaporizing core, an inner cover shell and an outer cover shell; the vaporizing core comprises a columnar body, one end of the columnar body is provided with a vaporizing cavity, a heating end of the ignition plug is arranged in the vaporizing cavity, at least one inner fire hole is arranged on the outer side of the columnar body and communicates with the outside, an oil pipe is arranged on the outer side of the columnar body and communicates with the vaporizing cavity, a vaporizing hole which communicates with the outside is arranged on the columnar body; the inner cover shell comprises a shell with an open end, the shell is arranged on the outer side of the vaporizing core, a gap is formed between the vaporizing core and the shell, the gap forms an air inlet channel, a positioning hole is arranged on the outer side of the shell and is in sealed communication with the inner fire hole; the outer cover shell comprises a top cover with an open end, a plurality of outer fire holes which communicate with the outside are arranged on the side wall of the top cover, the bottom of the inner cover shell is tightly combined with the inner wall of the top cover, and a gap is arranged between the upper part of the inner cover shell and the inner wall of the outer cover shell.

2. A liquid fuel auto-ignition vaporizer according to claim 1, wherein: The columnar body comprises an upper column and a lower column, the ignition plug is arranged in the lower column, and the oil pipe is arranged on the upper part or one side of the upper column.

3. A liquid fuel auto-ignition and vaporization device according to claim 2, wherein: The vaporizing hole is vertically arranged on the top of the upper column, the oil pipe is arranged on one side of the upper column, and the oil pipe is in parallel connection with the vaporizing hole and then communicates with the vaporizing cavity.

4. A liquid fuel auto-ignition and carburetion device according to claim 2, wherein: The inner cover shell further comprises a bottom disc arranged on the bottom of the shell, the width of the bottom disc is greater than that of the shell, the top cover is arranged on the upper part of the bottom disc, the shell is provided with at least one plane, and the positioning hole is arranged on the plane.

5. A liquid fuel auto-ignition and carburetion device according to claim 4, wherein: The lower column is a regular hexagonal prism, three planes are respectively arranged on the outer side and the inner side of the shell, a cover shell side air hole which communicates with the outside is arranged on each plane, the three planes on the inner side of the shell are tightly combined with three planes of the regular hexagonal prism, the other three planes of the regular hexagonal prism form the air inlet channel with the shell, and the oil pipe extends from the upper part of the upper column to the lower part of the lower column through one of the air inlet channels.

6. A liquid fuel auto-ignition and carburetion device according to claim 5, wherein: The cover shell side air hole is arranged on the upper part of the inner cover shell, the positions and the number of the cover shell side air holes on each plane are the same, and a cover shell upper air hole which communicates with the outside is arranged on the top of the shell.

7. The liquid fuel auto-ignition and vaporization device of claim 1, wherein: The inner fire hole and the positioning hole are fixed by a fixed fire ring, the fixed fire ring is a hollow structure, the inner fire hole is provided with an internal thread, one end of the fixed fire ring is provided with an external thread, the fixed fire ring is connected with the inner fire hole through the threads, and the diameter of the other end of the fixed fire ring is greater than that of the positioning hole.

8. A liquid fuel auto-ignition and carburetion device according to claim 4, wherein: The outer side edge of the bottom disc is folded upwards to form an annular groove with the upper part of the bottom disc, a plurality of vaporizing fins are uniformly distributed around the outer side of the outer cover shell, the outer fire holes are arranged between one or more vaporizing fins, and the vaporizing fins are arranged in the annular groove.

9. A burner tip comprising the liquid fuel ignition auto-vaporizing device according to any one of claims 1-8, characterized in that: The upper seat is surrounded by a side wall, the top of the side wall is bent outwards and then extends horizontally, the bottom of the side wall is bent inwards and then extends horizontally, and the center of the bottom of the side wall is provided with an upper seat opening; the bottom seat is surrounded by a side wall, the top of the side wall is connected with the extension of the top of the upper seat, the bottom of the side wall is bent inwards and then extends horizontally, and the center of the bottom of the side wall is provided with a bottom air inlet; the ignition plug and the oil pipe respectively pass through the upper seat opening and the bottom air inlet.

10. A burner tip as defined in claim 9, characterized in that: A plurality of upper seat side air holes are arranged around the upper seat, the horizontal plane of the extension of the top of the upper seat is provided with a plurality of upper seat upper air holes which are communicated with the upper seat side air holes; the center of the bottom of the bottom disc is provided with a positioning groove, the upper edge of the upper seat opening is provided with a protruding positioning ring, the positioning ring is installed in the positioning groove, the bottom surface of the outer cover is provided with a plurality of protruding screw holes which are pressed on the upper surface of the bottom of the upper seat, the bottom of the upper seat is provided with a screw which is fixed in the protruding screw hole, and a gap is arranged between the outer side of the annular groove and the inner wall of the upper seat.

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