Novel bulb

Abstract

The novel bulb comprises a lamp holder, a lampshade and a lamp wick assembly, the lamp wick assembly is arranged on the lamp holder in a penetrating mode, the lampshade is arranged at one end of the lamp wick assembly in a sleeving mode, the end of the lampshade extends into the lamp holder, and the lampshade is detachably connected with the lamp holder; a cooling cavity defined by the inner peripheral wall of the lamp holder and the outer peripheral wall of the lampshade is formed between the inner peripheral wall of the lamp holder and the outer peripheral wall of the lampshade, and a water inlet hole and a water outlet hole which are communicated with the cooling cavity are formed in the outer peripheral wall of the lamp holder; the lampshade and the lamp holder are detachably connected, and the lamp filament and the conductive column are detachably connected, so that the replacement convenience of the lamp filament is effectively improved, and the maintenance cost of the lamp filament is greatly reduced; through the arrangement of the cooling cavity and the cooling liquid, the lampshade and the lamp holder have the liquid cooling heat dissipation function, the working temperature of the lampshade and the lamp holder is effectively reduced, and therefore the service life of the bulb is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of heat radiation source heat dissipation, and in particular relates to a novel light bulb. Background Art

[0002] Thermal radiation refers to the phenomenon that an object radiates electromagnetic waves due to an increase in temperature. When thermal radiation irradiates the surface of the object to be heated, part of the radiation will be absorbed by the object to be heated, causing its temperature to increase to achieve the purpose of heating (commonly used in crystal purification, metal melting or plastic molding, etc.); Incandescent lamps, as a commonly used thermal radiation source, generate thermal radiation through the electrothermal effect, that is, when current passes through the filament, the filament continues to heat up due to the presence of resistance. The increase in the temperature of the filament causes the atoms and molecules inside it to vibrate at a higher speed. These vibrations cause the charge distribution between atoms and molecules to change, thereby generating the radiated electromagnetic waves;

[0003] In order to prevent the filament from oxidation, a glass cover is usually set around the filament, and a lamp holder is set around the glass cover to fix the glass cover. However, in the process of the filament emitting heat radiation, part of the heat will be absorbed by the glass cover and transferred to the lamp holder. If the temperature is too high, it will easily cause the lamp holder to melt and be damaged. At the same time, the service life of the filament or heating wire of the heat radiation source is relatively short. Therefore, in the prior art, the entire bulb needs to be replaced after the filament or heating wire is damaged, which leads to an increase in heating costs. Summary of the invention

[0004] (1) Technical issues to be solved

[0005] The invention discloses a novel light bulb, aiming to solve the problems in the prior art that a lamp holder is easily damaged by overheating and the light bulb needs to be completely replaced, resulting in increased heating costs.

[0006] (2) Technical solution

[0007] The present invention discloses a novel light bulb, comprising a lamp holder, a lampshade and a wick assembly, wherein the wick assembly is inserted into the lamp holder, the lampshade is sleeved on one end of the wick assembly and the end of the lampshade extends into the lamp holder, and the lampshade is detachably connected to the lamp holder; wherein a cooling cavity formed by the inner circumferential wall of the lamp holder and the outer circumferential wall of the lampshade is provided between the inner circumferential wall of the lamp holder and the outer circumferential wall of the lampshade, and a water inlet hole and a water outlet hole connected to the cooling cavity are provided on the outer circumferential wall of the lamp holder.

[0008] Furthermore, the cooling cavity is an annular structure and is arranged around the outer peripheral wall of the lampshade.

[0009] Furthermore, an air cavity is provided in the lamp holder, and an opening is provided at one end of the lamp cover located in the lamp holder, and the opening is located in the air cavity and communicated with the air cavity.

[0010] Furthermore, a detachable through-tube is provided on the outer peripheral wall of the lamp holder, and the through-tube is communicated with the air cavity.

[0011] Furthermore, a one-way valve is provided in the through pipe.

[0012] Furthermore, the wick assembly includes a filament and two conductive posts arranged parallel to each other, and one end of the two conductive posts located in the lampshade is detachably connected to one end of the filament respectively.

[0013] Furthermore, a locking piece is provided at the end of the conductive column, the filament passes through the locking piece and abuts against the conductive column, a screw hole and a screw are provided on the locking piece, and the screw passes through the screw hole to squeeze and fix the filament.

[0014] Furthermore, the material of the filament is pure tungsten or tungsten alloy.

[0015] Furthermore, the lamp holder includes an upper seat, a middle seat and a lower seat in sequence, the upper seat and the lower seat are respectively connected to the middle seat by bolts, and mounting grooves are provided between the upper seat and the middle seat and between the lower seat and the middle seat, and gaskets are provided in the mounting grooves.

[0016] Furthermore, a through hole corresponding to the wick assembly is provided in the lower seat, the wick assembly is passed through the through hole, and a sealing material is filled between the peripheral wall of the through hole and the outer peripheral wall of the wick assembly.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Through the detachable connection between the lampshade and the lamp holder, as well as the filament and the conductive column, the convenience of replacing the filament is effectively improved and the maintenance cost of the filament is greatly reduced, so that the user can appropriately replace the filament with different thicknesses, different materials and different winding shapes according to their own heating needs to meet the user's personalized debugging of the bulb;

[0019] 2. Through the setting of cooling cavity and coolant, the lampshade and lamp holder have liquid cooling function, which effectively reduces the working temperature of both, thereby increasing the service life of the bulb;

[0020] 3. By providing a through pipe and a one-way valve on the lamp holder, not only the vacuum treatment in the lamp holder and the lampshade and the convenience of gas filling are effectively improved, but also different gases can be filled according to the needs of the user, thereby adjusting the heating, luminous efficiency, and wavelength of electromagnetic radiation of the bulb and improving the service life of the filament. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 .

[0022] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 .

[0023] Figure 3 It is an overall exploded view of the present invention.

[0024] Figure 4 It is an overall cross-sectional view of the present invention.

[0025] Figure 5 for Figure 4 CC cross-sectional view and coolant flow diagram in.

[0026] Figure 6 for Figure 4 Enlarged view of point A.

[0027] Figure 7 It is a schematic diagram of the vacuuming and inflation principle of the present invention.

[0028] Figure 8 It is a schematic diagram of the through pipe structure of the present invention.

[0029] Fig. 9 for Figure 7 Enlarged view of point B and cross-sectional view of the limiting step.

[0030] Fig.10 It is a schematic diagram of the structure of the wick assembly of the present invention.

[0031] Fig.11 The winding structure of the present invention is shown in FIG. Figure 1 .

[0032] Fig.12 The winding structure of the present invention is shown in FIG. Figure 2 .

[0033] Fig.13 It is an exploded view of the lamp holder of the present invention.

[0034] Fig.14 It is a cross-sectional view of the lamp holder of the present invention.

[0035] Figure markings: 1-lamp holder, 11-upper holder, 12-middle holder, 13-lower holder, 131-through hole, 132-sealing material, 14-bolt, 15-mounting groove, 151-gasket, 16-sealing groove, 161-sealing ring, 2-lamp cover, 21-opening, 3-wick assembly, 31-filament, 311-winding part, 32-conductive column, 33-locking piece, 331-screw hole, 332-screw, 4-cooling chamber, 41-water inlet hole, 42-water outlet hole, 5-air cavity, 51-through pipe, 511-check valve, 52-limiting step. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1-4 As shown, the present invention discloses a novel light bulb, comprising a lamp holder 1, a lamp shade 2 and a wick assembly 3, wherein the wick assembly 3 is inserted into the lamp holder 1, so that two ends of the wick assembly 3 extend in opposite directions to the outside of the lamp holder 1, and the lamp shade 2 is sleeved on the heating end of the wick assembly 3, and the end of the lamp shade 2 extends into the lamp holder 1, so that a closed space is formed inside the lamp shade 2 to prevent the heating end of the wick assembly 3 from being exposed to the air and oxidized, and the lamp shade 2 and the lamp holder 1 are detachably connected;

[0038] Since the light bulb of the present invention mainly converts electrical energy into thermal energy through the thermal energy effect and uses the thermal energy to heat the object to be heated, the lampshade 2 and the lamp holder 1 will absorb part of the heat during the heating process of the light bulb, so that the temperature of the lampshade 2 and the lamp holder 1 increases. In actual application, the temperature of the lamp holder 1 is relatively high. Therefore, when the temperature of the lamp holder 1 is too high, it is easy to cause the lamp holder 1 and the sealing parts inside the lamp holder 1 (including but not limited to the sealing ring 161, sealing material 132 and gasket 151 described below) to melt and be damaged; in order to solve this technical problem, in the present invention, a cooling cavity 4 formed by the inner peripheral wall of the lamp holder 1 and the outer peripheral wall of the lampshade 2 is provided between the inner peripheral wall of the lamp holder 1 and the outer peripheral wall of the lampshade 2, and a water inlet hole 41 and a water outlet hole 42 connected with the cooling cavity 4 are provided on the outer peripheral wall of the lamp holder 1;

[0039] When in use, the heating end of the wick assembly 3 generates heat after conducting electricity, and part of the heat is transferred to the lampshade 2 and the lamp holder 1. At this time, the water inlet hole 41 and the water outlet hole 42 are both connected with cooling liquid, and the cooling liquid continuously enters and fills the cooling cavity 4 from the water inlet hole 41, so that the cooling liquid can fully contact the lampshade 2 and the lamp holder 1 respectively to absorb heat, and the cooling liquid after absorbing heat is discharged from the water outlet hole 42 outside the bulb, so that the lampshade 2 and the lamp holder 1 can achieve the purpose of continuous cooling;

[0040] It should be noted that the coolant can be a conventional coolant on the market, such as synthetic oil, fluorocarbon coolant, anhydrous coolant, silicate coolant, dielectric fluid, etc., and in this embodiment, the coolant is preferably water or a water-based coolant.

[0041] Specifically, Figure 5 As shown, in order to further increase the contact and heat dissipation area between the coolant and the lampshade 2 and the lamp holder 1, the cooling cavity 4 is annular in structure as a whole and is arranged around the outer peripheral wall of the lampshade 2, thereby improving the heat dissipation efficiency and making the heat dissipation parts of the lampshade 2 and the lamp holder 1 more evenly distributed; it should be noted that, in one embodiment, a concave structure (not shown) can also be provided on the outer peripheral wall of the lampshade 2 corresponding to the cooling cavity 4, so that the diameter of the lampshade 2 can be reduced within the allowed range, thereby further increasing the space of the cooling cavity 4 to improve the heat dissipation efficiency;

[0042] Furthermore, if Figure 6 As shown, a sealing groove 16 is provided in the lamp holder 1 and at the upper and lower sides of the cooling cavity 4, and a sealing ring 161 is provided in the sealing groove 16. During installation, the sealing ring 161 is arranged in the sealing groove 16, and a part of the sealing ring 161 is tightly abutted against the lamp holder 1, and the other part is tightly abutted against the outer peripheral wall of the lamp cover 2, thereby ensuring that the upper and lower ends of the cooling cavity 4 are in a sealed state to prevent the coolant from leaking out.

[0043] Specifically, Figure 7-8 As shown, the lamp holder 1 is provided with an air cavity 5, and one end of the lampshade 2 located in the lamp holder 1 is provided with an opening 21, and the opening 21 is located in the air cavity 5 and communicates with the air cavity 5. At this time, the air cavity 5 and the interior of the lampshade 2 form a closed space together to prevent the heating end of the wick assembly 3 from contacting with the air and being oxidized to affect the service life;

[0044] Furthermore, a detachable through-tube 51 is provided on the outer peripheral wall of the lamp holder 1, and the through-tube 51 is communicated with the air cavity 5, and a one-way valve 511 is also provided in the through-tube 51; in actual use, the propagation effect of heat radiation in a vacuum is better, so in the present invention, the gas in the air cavity 5 and the lampshade 2 can be extracted by using the through-tube 51 and the one-way valve 511, so that the heating end of the wick assembly 3 is in a vacuum space, thereby improving the heating efficiency of the bulb;

[0045] At the same time, different gases, such as inert gas or a mixture of inert gases, can be filled into the air cavity 5 and the lampshade 2 through the through pipe 51, so as to change the heating efficiency, luminous color, luminous brightness, wavelength of electromagnetic waves radiated (affecting the absorption rate and penetration rate of the heated object) of the bulb and improve the service life of the wick assembly 3;

[0046] Furthermore, if Fig. 9As shown, located inside the lamp holder 1, a limiting step 52 is also provided on the peripheral wall of the air cavity 5, which abuts against the end wall of the opening 21 of the lamp cover 2. During installation, the end wall of the opening 21 abuts against the limiting step 52 to improve the connection stability between the lamp cover 2 and the lamp holder 1.

[0047] Specifically, Fig.10 As shown, the wick assembly 3 includes a filament 31 and two conductive posts 32 arranged in parallel with each other, one end of the two conductive posts 32 located in the lampshade 2 is detachably connected to one end of the filament 31, and the end of the conductive post 32 away from the filament 31 passes through the lamp holder 1 and extends outward, wherein the heating end mentioned above is the setting position of the filament 31; when in use, the part of the conductive post 32 located outside the bulb is connected to the power supply and conducts current to the filament 31, so that the filament 31 is electrically heated to generate heat radiation;

[0048] Furthermore, a locking piece 33 is provided at one end of the conductive column 32 close to the filament 31, the filament 31 passes through the locking piece 33 and abuts against the conductive column 32, a screw hole 331 and a screw 332 are provided on the locking piece 33, and the screw 332 passes through the screw hole 331 to squeeze and fix the filament 31;

[0049] When the filament 31 is damaged or needs to be repaired or replaced, it is only necessary to pull out the lampshade 2 to expose the filament 31, and loosen the screw 332 in the screw hole 331 to remove and replace the filament 31. After the filament 31 is installed, it is only necessary to tighten the screw 332 and put the lampshade 2 again to complete the replacement and installation of the filament 31. The detachable connection between the lampshade 2 and the lamp holder 1 and the setting of the locking member 33 effectively improve the convenience of disassembly and assembly of the filament 31, and also improve the firmness of the filament 31, so as to prevent the filament 31 from sagging or breaking due to high temperature and affecting the normal operation of the bulb.

[0050] At the same time, since the filament 31 needs to be in a high-temperature working state for a long time, the service life of the filament 31 is short. In actual use, a large number of filaments 31 need to be replaced. In the prior art, damage to the filament 31 usually requires replacement of the entire bulb, which will cause huge cost waste. Compared with the prior art, the present invention can only replace the filament 31 while retaining most of the bulb parts, which is not only simple to replace, but also can greatly reduce the maintenance cost and heating cost of the bulb.

[0051] It is also worth noting that, through the detachable connection between the filament 31 and the conductive column 32, the user can replace the filament 31 in time according to actual use needs, and use the filament 31 with different thicknesses, lengths, materials, and winding structures to achieve personalized heating of the object to be heated, thereby improving the practicality of the light bulb;

[0052] Preferably, since tungsten has a high melting point (about 3422°C), it is not easy to melt and evaporate at high temperatures, which enables the tungsten filament to work stably at high temperatures. At the same time, the resistivity of the tungsten filament is high, which means that the tungsten filament can generate more heat under the same current. Therefore, in this embodiment, the material of the filament 31 is preferably pure tungsten or tungsten alloy.

[0053] It should be noted that different winding structures of the filament 31 may affect the light emission, heating efficiency and service life of the filament 31;

[0054] When the heating requirement is medium, the filament 31 may adopt a single spiral structure, which can increase the length of the filament 31 within a limited space, thereby improving the luminous efficiency and heating efficiency;

[0055] When high heating demand is required, the filament 31 may adopt a double helix structure, which can further increase the length of the filament 31 and reduce the resistance of the filament 31, thereby allowing a larger current to pass through and generating a higher amount of heat;

[0056] When the heating requirement is relatively small, the filament 31 may also adopt a straight-line structure;

[0057] At the same time, since the filament 31 usually starts to heat up and light up from the middle of the filament 31 during the heating process, a winding portion 311 is usually provided in the middle of the filament 31 to make the heating point of the filament 31 more concentrated, and the winding portion 311 is formed by the filament 31 winding around the central axis L of the winding portion 311; when heating up, the middle of the winding portion 311 usually starts to heat up, so compared with the two ends of the winding portion 311 along the central axis L, the heating effect of the surrounding surface of the winding portion 311 is better, so in actual application, the direction of the winding portion 311 of the filament 31 can be adjusted to make the main heating direction of the filament 31 match the position of the object to be heated;

[0058] like Fig.11 As shown, when the central axis L of the winding portion 311 is arranged horizontally, the heat of the filament 31 is mainly diffused from the top of the bulb, which is suitable for a heating environment where the object to be heated is located at the top of the bulb;

[0059] like Fig.12As shown, when the central axis L of the winding portion 311 is arranged longitudinally, the heat of the filament 31 is mainly diffused from the peripheral wall of the bulb, which is suitable for a heating environment where the object to be heated is located on the side of the bulb.

[0060] Specifically, Figure 13-14 As shown, in order to improve the convenience of the overall installation of the bulb, the lamp holder 1 includes an upper seat 11, a middle seat 12 and a lower seat 13 in sequence, and the upper seat 11 and the lower seat 13 are detachably connected to the middle seat 12 by bolts 14, wherein an annular mounting groove 15 is provided between the upper seat 11 and the middle seat 12, and between the lower seat 13 and the middle seat 12, and an annular gasket 151 is provided in the mounting groove 15; during installation, the mounting groove 15 presses the gasket 151 up and down, so that the internal space of the lamp holder 1 has good sealing performance;

[0061] Furthermore, a through hole 131 corresponding to the conductive column 32 is provided in the lower seat 13, and the conductive column 32 is passed through the through hole 131. The surrounding wall of the through hole 131 and the outer wall of the conductive column 32 are filled with a sealing material 132. In this embodiment, vacuum brazing can be used to fill the surrounding wall of the through hole 131 and the outer wall of the conductive column 32, so that the air cavity 5 has good airtightness while ensuring that the sealing material 132 has high temperature resistance, so as to improve the service life of the bulb.

[0062] The working principle of the present invention is described in detail below;

[0063] During installation, the conductive column 32 is firstly passed through the through hole 131 and the sealing material 132 to pass through the lower seat 13 tightly, and then the middle seat 12 is connected to the lower seat 13 by the bolt 14, and then the filament 31 is locked in the locking member 33 by the screw 332, and then the sealing ring 161 is installed in the sealing groove 16, and then the lampshade 2 is sleeved on the filament 31 and plugged into the lamp holder 1, so that the end wall of the opening 21 of the lampshade 2 is abutted and fixed with the limiting step 52 in the air cavity 5, and then the upper seat 11 is sleeved on the lampshade 2 and connected to the middle seat 12 by the bolt 14, and finally the through pipe 51 is installed on the lamp holder 1 and the gas in the lampshade 2 and the air cavity 5 is extracted through the through pipe 51 to form a vacuum state, and then the vacuum state is filled with inert gas, thereby completing the installation of the bulb;

[0064] When disassembling, it is necessary to first use the through pipe 51 to fill the lamp holder 1 and the lamp shade 2 with gas to balance the air pressure inside the lamp holder 1 and the lamp shade 2 with the air pressure outside, so as to facilitate the disassembly of the lamp shade 2. Then, the filament 31 can be replaced through the above steps.

[0065] In actual application, the coolant needs to continuously enter from the water inlet hole 41 and fill the cooling cavity 4, and then be discharged from the water outlet hole 42, so that the lampshade 2 and the lamp holder 1 are in a state of continuous cooling. Then, the conductive column 32 is energized to make the filament 31 generate electricity and heat, and the filament 31 emits heat radiation to heat the object to be heated. During the heating process, part of the heat absorbed by the lampshade 2 and the lamp holder 1 is discharged outside the bulb through the coolant.

[0066] The innovation of the present invention is that the detachable connection between the lampshade and the lamp holder and between the filament and the conductive column effectively improves the convenience of replacing the filament and greatly reduces the maintenance cost of the filament, so that the user can appropriately replace the filament with different thicknesses, different materials and different winding shapes according to his own heating needs to meet the user's personalized debugging of the light bulb;

[0067] Secondly, by setting up the cooling cavity and the coolant, the lampshade and the lamp holder have the function of liquid cooling and heat dissipation, which effectively reduces the working temperature of the two, thereby increasing the service life of the bulb;

[0068] Finally, by providing a through pipe and a one-way valve on the lamp holder, not only the vacuum treatment in the lamp holder and the lampshade and the convenience of gas filling are effectively improved, but also different gases can be filled according to the needs of the user, thereby adjusting the heating, luminous efficiency, and wavelength of electromagnetic radiation of the bulb and increasing the service life of the filament.

[0069] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0070] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A novel light bulb, comprising a lamp holder (1), a lamp shade (2) and a wick assembly (3), characterized in that: The wick assembly (3) is inserted into the lamp holder (1), the lampshade (2) is sleeved on one end of the wick assembly (3) and the end of the lampshade (2) extends into the lamp holder (1), and the lampshade (2) and the lamp holder (1) are detachably connected; A cooling cavity (4) is provided between the inner circumferential wall of the lamp holder (1) and the outer circumferential wall of the lamp cover (2), and the cooling cavity (4) is formed by the inner circumferential wall of the lamp holder (1) and the outer circumferential wall of the lamp holder (1). A water inlet hole (41) and a water outlet hole (42) which are in communication with the cooling cavity (4) are provided on the outer circumferential wall of the lamp holder (1).

2. A novel light bulb according to claim 1, characterized in that: The cooling cavity (4) is in an annular structure and is arranged around the outer peripheral wall of the lampshade (2).

3. A novel light bulb according to claim 1, characterized in that: An air cavity (5) is provided in the lamp holder (1); an opening (21) is provided at one end of the lampshade (2) located in the lamp holder (1); the opening (21) is located in the air cavity (5) and communicates with the air cavity (5).

4. A novel light bulb according to claim 3, characterized in that: A detachable through-tube (51) is provided on the outer peripheral wall of the lamp holder (1), and the through-tube (51) is in communication with the air cavity (5).

5. A novel light bulb according to claim 4, characterized in that: A one-way valve (511) is provided in the through pipe (51).

6. A novel light bulb according to claim 1, characterized in that: The wick assembly (3) comprises a filament (31) and two conductive posts (32) arranged parallel to each other, and one end of the two conductive posts (32) located inside the lampshade (2) is detachably connected to one end of the filament (31).

7. A novel light bulb according to claim 6, characterized in that: A locking piece (33) is provided at the end of the conductive column (32); the filament (31) passes through the locking piece (33) and abuts against the conductive column (32); a screw hole (331) and a screw (332) are provided on the locking piece (333); the screw (332) passes through the screw hole (331) to squeeze and fix the filament (31).

8. A novel light bulb according to claim 7, characterized in that: The material of the filament (31) is pure tungsten or tungsten alloy.

9. The novel light bulb according to claim 1, characterized in that: The lamp holder (1) comprises an upper seat (11), a middle seat (12) and a lower seat (13) in sequence; the upper seat (11) and the lower seat (13) are respectively connected to the middle seat (12) via bolts (14); a mounting groove (15) is provided between the upper seat (11) and the middle seat (12) and between the lower seat (13) and the middle seat (12); a gasket (151) is provided in the mounting groove (15).

10. A novel light bulb according to claim 9, characterized in that: A through hole (131) corresponding to the wick assembly (3) is provided in the lower seat (13); the wick assembly (3) is inserted into the through hole (131); and a sealing material (132) is filled between the peripheral wall of the through hole (131) and the outer peripheral wall of the wick assembly (3).

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