Liquid heater

Abstract

The utility model discloses a liquid heater, belongs to the field of life electric appliances, and solves the problem that foam overflows from a water outlet nozzle due to the fact that the real liquid level condition at the water outlet nozzle cannot be accurately obtained. According to the technical scheme, a heating pipe forms a first area stable in heating and a second area unstable in heating in the circumferential direction of a heating disc, a shell is arranged on the outer side of a glass cup body, a water outlet nozzle is formed in the top of the glass cup body, and a detection assembly used for detecting the liquid level across the air is arranged between the shell and the glass cup body in a hidden mode. The detection assembly comprises a circuit board body provided with induction metal sheets, the circuit board body longitudinally extends along the outer wall of the glass cup body, the induction metal sheets are longitudinally distributed on the circuit board body, and in the circumferential direction of the glass cup body, the induction metal sheets and the water outlet nozzle avoid the second area and are located above the first area. The liquid level sensor is mainly used for ensuring that the real liquid level condition at the water outlet nozzle can be obtained, and foam is effectively prevented from overflowing from the water outlet nozzle.

Description

Technical Field

[0001] The utility model relates to a household appliance, in particular to a liquid heater. Background Art

[0002] As a common household appliance in daily life, such as a boiling water pot, an electric kettle, a health kettle, etc., a liquid heater generally includes a glass cup body and a heating plate. The heating plate and the glass cup body cooperate to form a container for holding liquid. One side of the heating plate is provided with a heating tube arranged around the center of the heating plate. The heating tube generally adopts an open-loop structure with gaps at both ends. For example, the heating tube 11 disclosed in the prior art CN208658830U. Due to the low thermal efficiency at the ends of the heating tube and the absence of a heat source between the two ends of the heating tube, the heating effect between the two ends of the heating tube is unstable. Therefore, in order to avoid the foregoing problems, the heating tube is designed as a Figure 2 closed-loop structure as shown in the figure, and one end of the heating tube is located inside the other end to form an overlapping part. However, it is found in actual use that the heating effect is also unstable in the overlapping part of the heating tube due to the low thermal efficiency at the ends of the heating tube.

[0003] Some liquid heaters, such as a health kettle, can be used to boil water, make tea, make coffee and stew some ingredients, such as tremella, etc. In actual use, a large amount of foam will be generated when making coffee or stewing tremella. In order to prevent the foam from overflowing, an anti-overflow structure is provided. For example, the prior art CN 215127293U discloses a kettle, including: a kettle body, the bottom of which is provided with a heating component and a thermostat. The kettle body is also provided with a temperature detector for detecting the temperature inside the kettle and a water level detector for detecting the water level inside the kettle; a circuit board is arranged at the bottom of the kettle body and is electrically connected to the heating component, the thermostat, the temperature detector and the water level detector respectively. The thermostat can control the operation of the heating component according to the temperature detected by the temperature detector and the water level detected by the water level detector. The kettle of the above prior art can accurately and reliably control the heating operation of the heating component through the cooperation of the temperature detector and the water level detector to prevent hot water at too high a temperature from overflowing the kettle, or to prevent the kettle from dry burning to protect the kettle and improve the user experience.

[0004] Since the heating tubes with open ring structure or closed loop structure will have unstable heating effect, the changing speed of the foam liquid level above them will be unstable, and the foam liquid level will easily change too quickly. In order to facilitate the pouring of ingredients in the kettle body, a water outlet is generally provided on the top of the kettle body. This makes it easier for the foam to overflow from the water outlet. Therefore, if the information consistent with the liquid level height at the water outlet cannot be accurately obtained when detecting the foam liquid level, it is easy for the foam liquid level signal detected by the sensing metal sheet to fail to accurately reflect the actual liquid level at the water outlet, causing the foam to overflow from the water outlet. Utility Model Content

[0005] The purpose of the utility model is to provide a liquid heater to solve the problem that the actual liquid level at the water outlet cannot be accurately obtained, which will cause foam to overflow from the water outlet, ensure that the actual liquid level at the water outlet can be obtained, and effectively prevent foam from overflowing from the water outlet.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a liquid heater, comprising a glass cup body and a heating plate, the heating plate and the glass cup body cooperate to form a container for holding liquid, a heating tube arranged around the center of the heating plate is provided on one side of the heating plate, the heating tube forms a first heating stable area and a second heating unstable area in the circumferential direction of the heating plate, a shell is provided on the outside of the glass cup body, a water outlet is provided on the top of the glass cup body, a detection component for detecting the liquid level in the air is hidden between the shell and the glass cup body, the detection component comprises a circuit board body provided with a sensing metal sheet, the circuit board body extends longitudinally along the outer wall of the glass cup body, the sensing metal sheet is longitudinally distributed on the circuit board body, and in the circumferential direction of the glass cup body, the sensing metal sheet and the water outlet are both located above the first area avoiding the second area.

[0007] After adopting the above technical scheme, the utility model has the following advantages: since the heating effect of the first area of ​​the heating tube is stable and the foam level change speed is stable, the sensing metal sheet and the water outlet both avoid the second area and are located above the first area, that is, the sensing metal sheet and the water outlet are both arranged in an area where the foam level change speed is relatively consistent, the foam level detected by the sensing metal sheet can more realistically reflect the foam level below the water outlet, thereby ensuring the effectiveness of the overflow prevention detection and effectively preventing the foam from overflowing from the water outlet.

[0008] Furthermore, the circuit board body and the water spout are symmetrically distributed about the center of the glass body.

[0009] By adopting the above technical solution, production can be easily realized at a relatively low cost on an existing production line.

[0010] Furthermore, the projection of the induction metal sheet on the heating plate at least partially overlaps with the first area of ​​the heating tube.

[0011] Adopting the foregoing technical solution further ensures that the induction metal sheet can detect the foam liquid level in the stable heating effect area, improving the stability and reliability of foam liquid level detection. The projection of the induction metal sheet on the heating plate can also completely coincide with the first area of the heating tube.

[0012] Furthermore, the induction metal sheet includes a plurality of second capacitor sheets, which are longitudinally arranged at intervals, and the plurality of second capacitor sheets form an anti-overflow detection area on the circuit board body. The projection of the second capacitor sheet on the heating plate partially coincides with the heating tube.

[0013] Adopting the foregoing technical solution, the second capacitor sheets at different height positions can generate different signals, which is beneficial to providing anti-overflow requirements at different heights when making different beverages, while ensuring the timeliness and accuracy of anti-overflow detection and reducing the risk of anti-overflow delay.

[0014] Furthermore, the anti-overflow detection area is located above half of the height of the glass body.

[0015] Adopting the foregoing technical solution, if the anti-overflow detection area is set too low, it will cause frequent anti-overflow actions, and there will be a situation where the anti-overflow action is executed when the foam liquid level is far from reaching the height at which it will overflow, losing the meaning of anti-overflow and affecting the normal use of the product. Therefore, designing the anti-overflow detection area above half of the height of the glass body ensures the effectiveness of the anti-overflow action.

[0016] Furthermore, the induction metal sheet includes a plurality of first capacitor sheets longitudinally arranged at intervals, and the plurality of first capacitor sheets form a water level detection area on the circuit board body. The water level detection area is located below the anti-overflow detection area.

[0017] Adopting the foregoing technical solution, since the height space below the anti-overflow detection area does not require anti-overflow detection, on the basis of the anti-overflow detection area, a water level detection area is added to expand the function of the detection component.

[0018] Furthermore, along the height direction of the circuit board body, the detection height of a single second capacitor sheet is greater than the detection height of a single first capacitor sheet.

[0019] Adopting the foregoing technical solution, the generation and rupture of foam can occur within the height range of a single second capacitor sheet, and the detection signal does not change during this process, which can reduce the situation where the anti-overflow action is taken when the actual foam liquid level has not risen to the height at which the anti-overflow action is required due to the generation and rupture of foam, further improving the stability of anti-overflow detection. And the small detection height of a single first capacitor sheet can detect the water level change more quickly.

[0020] Further, the heating tube is wound into a closed-loop structure in the circumferential direction of the heating plate, one end of the heating tube is located inside the other end to form an overlapping part, and the overlapping part forms a second region; alternatively, the heating tube is wound into an open-loop structure in the circumferential direction of the heating plate, there is a gap between one end and the other end of the heating tube, and a second region is formed between one end and the other end of the heating tube.

[0021] Further, a bottom cover is provided below the container, and the bottom cover and the container cooperate to form an installation cavity for accommodating the upper coupler. The circuit board body extends into the installation cavity through a wire and is electrically connected to the upper coupler; alternatively, the circuit board body is electrically connected to a signal transmitter, the liquid heater includes a power supply base, and a signal receiver is provided inside the power supply base, and the signal receiver and the signal transmitter are matched to form signal transmission.

[0022] By adopting the foregoing technical solution, it is possible to realize the timely and stable transmission of the detection signal of the induction metal sheet.

[0023] Further, the glass cup body includes an arc-shaped outer wall extending upward and inward in the height direction, and the circuit board body extends along the arc-shaped outer wall; alternatively, the glass cup body includes a straight cylindrical outer wall extending vertically in the height direction, and the circuit board body extends vertically along the straight cylindrical outer wall; alternatively, the glass cup body includes a conical cylindrical outer wall extending upward and inward in the height direction, and the circuit board body extends along the conical cylindrical outer wall.

[0024] By adopting the foregoing technical solution, the circuit board body is attached to the outer wall of the glass cup body, reducing the air between the two, which can reduce the influence of air on the detection of the induction metal sheet, improve the detection sensitivity, and can more accurately reflect the true situation of the foam liquid level. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following further describes the present invention with reference to the accompanying drawings:

[0026] Figure 1 It is a schematic diagram of a liquid heater of the present invention (without a heating plate);

[0027] Figure 2 It is a schematic diagram of the bottom of the container in the present invention;

[0028] Figure 3 It is a bottom view of the container in the present invention;

[0029] Figure 4 It is a schematic diagram (one) of the projection of the induction metal sheet on the heating plate in the present invention;

[0030] Figure 5 It is a schematic diagram (two) of the projection of the induction metal sheet on the heating plate in the present invention;

[0031] Figure 6It is a schematic diagram of the circuit board body in the present utility model;

[0032] Figure 7 It is a schematic diagram of the container and the power supply base in the present utility model;

[0033] Figure 8 It is a schematic diagram of the heating tube in the second embodiment of the present utility model. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model.

[0035] The terms "first", "second", etc. (if any) in the description and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily imply the existence of "first". It should be understood that in the present utility model, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. It should be understood that in the present utility model, "a plurality of" means two or more. "And / or" is merely a description of the associated relationship of the associated objects, indicating that three relationships may exist. For example, X and / or Y may represent: X exists alone, X and Y exist simultaneously, and Y exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. "Including X, Y and Z", "including X, Y, Z" means that all of X, Y, and Z are included, "including X, Y or Z" means including any one of X, Y, and Z, and "including X, Y and / or Z" means including any one or any two or three of X, Y, and Z.

[0036] The technical solutions of the present utility model will be described in detail below with specific embodiments. These specific embodiments can be combined or replaced according to the actual situation. For the same or similar concepts or processes, they may not be repeated in some embodiments.

[0037] Embodiment 1:

[0038] The present utility model provides a liquid heater, as Figure 1 shown, including a glass cup body 100 and a heating plate 200. A water outlet nozzle 11 is provided at the top of the glass cup body 100. The heating plate 200 and the glass cup body 100 cooperate to form a container for containing liquid. Combining Figure 2 and Figure 3As can be seen, a heating tube 21 is provided on one side of the heating plate 200 and is arranged around the center of the heating plate 200. The heating tube 21 forms a first area 21A with stable heating and a second area 21B with unstable heating in the circumferential direction of the heating plate 200. A shell 300 is provided on the outside of the glass cup body 100. A detection component 400 for detecting the liquid level in the air is hidden between the shell 300 and the glass cup body 100. The detection component 400 includes a circuit board body 41 provided with a sensing metal sheet 411. The circuit board body 41 extends longitudinally along the outer wall of the glass cup body 100. The sensing metal sheet 411 is longitudinally distributed on the circuit board body 41. In the circumferential direction of the glass cup body 100, the sensing metal sheet 411 and the water outlet 11 avoid the second area 21B and are located above the first area 21A. Specifically, the first area 21A refers to the area covered by the heating tube 21 after removing the part between the two ends and connecting with the heating plate 200, and is a curved plane extending along the heating tube 21. The second area 21B is the area covered by the part between the two ends of the heating tube 21 and connecting with the heating plate 200. The boundary between the second area 21B and the first area 21A can be divided by radiating outward from the end of the heating tube 21.

[0039] The shell 300 may only cover a portion of the outer wall of the glass body 100, for example Figure 1 The middle shell 300 is designed with a handle 31, which can cover the detection assembly 400, so that the user can observe the working conditions inside the container through the glass cup body 100, thereby improving the user experience. The shell 300 can also completely cover the outer wall of the glass cup body 100 to protect the glass cup body 100, and accordingly, an observation window can be opened on the shell 300 for conveniently observing the working conditions inside the container.

[0040] The glass cup body 100 can generally be a simple glass product, and the detection component 400 is in direct contact with the glass material. The glass cup body 100 can also include a glass substrate and a film. The film is arranged on the outer side of the glass substrate and can cover part or all of the outer side of the glass substrate. Some marks, such as water level marks, prompt marks, etc., are set on the film. At this time, the outer wall of the glass cup body 100 is the outer side of the film, and the detection component 400 is in contact with the film. In addition, a silk-screen shielding layer, such as ink or film, can be set on the outer wall of the glass cup body 100 to prevent the user from directly observing the detection component through the glass cup body 100 from the inside of the glass cup body 100, thereby improving the aesthetics. The silk-screen shielding layer is considered to be a part of the glass cup body 100, and the outer wall of the glass cup body 100 is the outer side of the silk-screen shielding layer, and the detection component 400 is in contact with the silk-screen shielding layer.

[0041] Since the heating effect of the first region 21A of the heating tube is stable and the change rate of the foam liquid level is stable, the induction metal sheet 411 and the water outlet 11 both avoid the second region 21B and are located above the first region 21A. That is, the induction metal sheet 411 and the water outlet 11 are both arranged in the region where the change rate of the foam liquid level is relatively consistent. The foam liquid level detected by the induction metal sheet 411 can more truly reflect the foam liquid level below the water outlet 11, ensuring the effectiveness of the anti-overflow detection, and thus effectively preventing the foam from overflowing from the water outlet 11.

[0042] In order to further ensure that the induction metal sheet can detect the foam liquid level in the region with stable heating effect, it can be designed that there is a certain distance between the induction metal sheet 411 and the water outlet 11 and the second region 21B, reducing the influence of unstable heating effect on the anti-overflow effect.

[0043] In one embodiment, it can also be designed that the circuit board body 41 and the water outlet 11 are symmetrically distributed about the center of the glass cup body 100. The handle 31 is generally arranged at the position opposite to the water outlet 11. Therefore, in the scheme where the housing 300 only covers the detection component 400, arranging the circuit board body 4 at the position opposite to the water outlet 11 can be easily realized at a relatively low cost on the existing production line.

[0044] In order to further ensure that the induction metal sheet can detect the foam liquid level in the region with stable heating effect, the projection of the induction metal sheet 411 on the heating plate 200 partially coincides with the first region 21A of the heating tube 21. For example Figure 4 As shown, in some embodiments, the top diameter of the glass cup body 100 is smaller and the inclination angle of the outer side wall is larger. After projecting onto the heating plate 200 along the height direction of the glass cup body 100, the top projection of the induction metal sheet 411 is located inside the heating tube 21, and the bottom projection of the induction metal sheet 411 is located outside the heating tube 21. That is, the projection of the induction metal sheet 411 partially coincides with the heating tube 21. And in some embodiments, the inclination angle of the outer side wall of the glass cup body 100 extending obliquely is smaller, or even vertically extending. For example Figure 5 As shown, the projection of the induction metal sheet 411 can also completely coincide with the first region 21A of the heating tube 21.

[0045] Reference Figure 6, in order to achieve anti-overflow detection, the induction metal sheet 411 includes a plurality of second capacitor sheets 411B. The plurality of second capacitor sheets 411B are longitudinally spaced apart, and the plurality of second capacitor sheets 411B form an anti-overflow detection area 401 on the circuit board body 41. The second capacitor sheets 411B at different height positions can generate different signals, which is beneficial to providing anti-overflow requirements at different heights when making different beverages. For example, for beverages with very fast foam generation and difficult-to-break foam, the second capacitor sheet 411B at a lower position can be used for anti-overflow detection, while for beverages with slower foam generation and easy-to-break foam, the second capacitor sheet 411B at a higher position can be used for anti-overflow detection. If the anti-overflow detection area 401 is set too low, it will cause frequent anti-overflow actions, and there will be a situation where the anti-overflow action is executed when the foam liquid level is far from reaching the height at which it will overflow, losing the meaning of anti-overflow and affecting the normal use of the product. Therefore, generally, the anti-overflow detection area 401 is designed to be above half of the height of the glass body 100. In order to ensure the timeliness and accuracy of anti-overflow detection and reduce the risk of anti-overflow delay, only the projection of the second capacitor sheet on the heating plate in the induction metal sheet 411 may coincide or completely coincide with the heating tube part.

[0046] Since there is no need to perform anti-overflow detection in the height space below the anti-overflow detection area 401, on the basis of the anti-overflow detection area 401, the induction metal sheet 411 can also be designed to include a plurality of first capacitor sheets 411A arranged longitudinally at intervals. The plurality of first capacitor sheets 411A form a water level detection area 402 on the circuit board body 41. The water level detection area 402 is located below the anti-overflow detection area 401, increasing the water level detection area and expanding the function of the detection component.

[0047] The foam itself has a certain height dimension. In order to increase the fault tolerance rate of anti-overflow detection, in one embodiment, along the height direction of the circuit board body 41, the detection height H2 of a single second capacitor sheet 411B is greater than the detection height H1 of a single first capacitor sheet 411A. The generation and rupture of foam can occur within the height range of a single second capacitor sheet 411B, and the detection signal will not change during this process, which can reduce the situation where the anti-overflow action is taken when the actual foam liquid level does not rise to the height at which the anti-overflow action needs to be performed due to the generation and rupture of foam, further improving the smoothness of anti-overflow detection. And the small detection height H1 of a single first capacitor can more quickly reflect the change of the water level.

[0048] In one embodiment, the detection component 400 is adhesively bonded to the outer side wall of the glass body 100 with glue, and other common methods such as riveting and screwing can also be used to fix the detection component 400. In another embodiment, the detection component 400 can further include a pressing plate 42, and the circuit board body 41 is pressed and fixed through the pressing plate 42. The pressing plate 42 can be fixed to the outer side wall of the glass body 100 by means of glue or screw hoop.

[0049] Reference Figure 7 Figure 7 , the liquid heater of the present utility model further includes a power supply base 500. The power supply base 500 is provided with a lower coupler 51. When the container is placed on the power supply base 500, it can obtain the working power supply. Specifically, in one embodiment, a bottom cover 600 is provided below the container. The bottom cover 600 and the container cooperate to form an installation cavity for accommodating the upper coupler 61. The upper coupler 61 is inserted and electrically coupled with the lower coupler 51 to obtain the power supply. The circuit board body 41 extends into the installation cavity through a wire and is electrically connected to the upper coupler 61. Transmitting information through the wire is relatively stable. In addition to realizing signal transmission through wired connection, wireless connection can also be used to realize signal transmission. For example, in another embodiment, the circuit board body 41 is electrically connected to a signal transmitter, and a signal receiver is provided inside the power supply base 500. The signal receiver and the signal transmitter are matched to form signal transmission.

[0050] In some models, the glass cup body 100 includes an arc-shaped outer wall that extends upward and inward in the height direction, and the circuit board body 41 extends along the arc-shaped outer wall. In other models, the glass cup body 100 includes a conical barrel outer wall that extends obliquely in the height direction. For example Figure 4 as shown, the circuit board body 41 extends along the conical barrel outer wall. In still other models, the glass cup body 100 includes a straight barrel outer wall that extends vertically in the height direction. For example Figure 7 as shown, the circuit board body 41 extends vertically along the straight barrel outer wall. No matter how the outer wall of the glass cup body 100 extends, as long as the circuit board body 41 fits the outer wall of the glass cup body 100 and reduces the air between the two, the influence of the air on the detection of the induction metal sheet 411 can be reduced, the detection sensitivity can be improved, and the true situation of the foam liquid level can be more accurately reflected.

[0051] Embodiment 2:

[0052] The present utility model is not only applicable to the heating tube 21 with a closed-loop structure, but also applicable to the heating tube 21 with an open-loop structure. As Figure 8 shown, the heating tube 21 is wound into an open-loop structure in the circumferential direction of the heating plate 200. There is a gap between one end and the other end of the heating tube 21, and a second region 21B is formed between one end and the other end of the heating tube 21.

[0053] In addition to the above preferred embodiments, the present utility model has other implementation manners. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection requested by the present utility model.

Claims

1. A liquid heater, comprising a glass body and a heating plate, wherein a water outlet is provided on the top of the glass body, the heating plate and the glass body cooperate to form a container for holding liquid, a heating tube arranged around the center of the heating plate is provided on one side of the heating plate, the heating tube forms a first heating stable area and a second heating unstable area in the circumferential direction of the heating plate, a shell is provided on the outer side of the glass body, and the characteristics are: A detection component for detecting the liquid level in the air is hidden between the shell and the glass cup body. The detection component includes a circuit board body provided with a sensing metal sheet. The circuit board body extends longitudinally along the outer wall of the glass cup body. The sensing metal sheet is longitudinally distributed on the circuit board body. In the circumferential direction of the glass cup body, the sensing metal sheet and the water outlet are both located above the first area, avoiding the second area.

2. The liquid heater according to claim 1, characterized in that: The circuit board body and the water spout are symmetrically distributed about the center of the glass body.

3. The liquid heater according to claim 1, characterized in that: The projection of the induction metal sheet on the heating plate at least partially overlaps with the first area of ​​the heating tube.

4. The liquid heater according to claim 3, characterized in that: The inductive metal sheet includes a plurality of second capacitor sheets, which are arranged at intervals in the longitudinal direction and form an anti-overflow detection area on the circuit board body. The projection of the second capacitor sheet on the heating plate at least partially overlaps with the heating tube.

5. The liquid heater according to claim 4, characterized in that: The anti-overflow detection area is located above one-half of the height of the glass body.

6. The liquid heater according to claim 4, characterized in that: The inductive metal sheet includes a plurality of first capacitor sheets arranged at intervals in the longitudinal direction. The plurality of first capacitor sheets form a water level detection area on the circuit board body. The water level detection area is located below the anti-overflow detection area.

7. The liquid heater according to claim 6, characterized in that: Along the height direction of the circuit board body, the detection height of a single second capacitor sheet is greater than the detection height of a single first capacitor sheet.

8. The liquid heater according to claim 1, characterized in that: The heating tube is arranged in a closed loop structure around the circumference of the heating disk, one end of the heating tube is located on the inner side of the other end to form an overlapping portion, and the overlapping portion forms a second area; alternatively, the heating tube is arranged in an open loop structure around the circumference of the heating disk, there is a gap between one end of the heating tube and the other end, and a second area is formed between one end of the heating tube and the other end.

9. The liquid heater according to claim 1, characterized in that: A bottom cover is provided under the container, and the bottom cover cooperates with the container to form an installation cavity for accommodating the upper coupler. The circuit board body extends into the installation cavity through a wire and is electrically connected to the upper coupler; or, the circuit board body is electrically connected to a signal transmitter, and the liquid heater includes a power base, and a signal receiver is provided in the power base, and the signal receiver and the signal transmitter are matched to form signal transmission.

10. The liquid heater according to claim 1, characterized in that: The glass cup body includes an arc-shaped outer wall extending upward and inward in the height direction, and the circuit board body extends along the arc-shaped outer wall; or, the glass cup body includes a straight tube outer wall extending vertically in the height direction, and the circuit board body extends vertically along the straight tube outer wall; or, the glass cup body includes a conical tube outer wall extending upward and inward in an inclined manner in the height direction, and the circuit board body extends along the conical tube outer wall.

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