Ceramic heater

Abstract

The utility model provides a ceramic heater, and relates to the field of heaters. The ceramic heater comprises a heating unit, the heating unit comprises a heating rod made of aluminum oxide ceramic, a resistance wire, a positive plate, a negative plate and fins, the resistance wire is arranged in the heating rod, and the positive plate and the negative plate are electrically connected with the resistance wire; the fins are connected to the peripheral face of the heating rod in a sleeving mode and fixedly connected with the heating rod. The ceramic heater is simple in structure, convenient to assemble, light in weight, low in cost, large in heat conduction area and high in heat conduction efficiency.

Description

Technical Field

[0001] The utility model relates to the field of heaters, in particular to a ceramic heater. Background Art

[0002] Currently, the heating element of traditional water heaters is a PTC component, which transfers heat by fitting with the flow channel, resulting in a small contact area and poor thermal conductivity. Specifically, the PTC component includes a PTC ceramic sheet and two electrode sheets distributed on opposite sides of the PTC ceramic sheet and clamping the PTC. The electrode sheet and PTC ceramic sheet are wrapped with yellow paper to form a unit, and then an aluminum shell is connected to the unit. During use, the side of the aluminum shell is fitted with the flow channel, and the contact area between the aluminum shell and the flow channel is small, resulting in low thermal conductivity. In addition, existing PTC components have a complex structure, low assembly efficiency, and high processing and manufacturing costs. Utility Model Content

[0003] The purpose of the utility model is to provide a ceramic heater, which can simplify the structure, reduce the processing and manufacturing costs, and improve the heat conduction efficiency.

[0004] The embodiment of the present utility model is achieved as follows:

[0005] In a first aspect, the present invention provides a ceramic heater, comprising:

[0006] The heating unit includes a heating rod made of alumina ceramic, a resistance wire, a positive electrode sheet, a negative electrode sheet and a fin. The resistance wire is arranged in the heating rod, and the positive electrode sheet and the negative electrode sheet are electrically connected to the resistance wire; the fin is sleeved on the outer circumference of the heating rod and fixedly connected to the heating rod.

[0007] In an optional embodiment, the resistance wire and the heating rod are sintered into an integrated structure.

[0008] Based on the above solution, the combination of the resistance wire and the heating rod is firm and reliable, with a long service life. At the same time, it can realize large-scale automated production, improve production efficiency and reduce manufacturing costs.

[0009] In an optional embodiment, the heating rod is provided with a through hole extending in its own axial direction.

[0010] Based on the above solution, the heating rod is configured as a hollow structure, which can also be called a heating tube. Since the interior is hollow, it saves processing materials, reduces processing and manufacturing costs, and is light in weight. It should be understood that the heating rod can also be a solid structure, which can also be called a heating column or heating rod.

[0011] In an optional embodiment, the fin includes a heat-conducting connecting tube and a plurality of heat-conducting annular plates, the heat-conducting connecting tube is sleeved on the outside of the heating rod, and the plurality of heat-conducting annular plates are all sleeved on the outside of the heat-conducting connecting tube and fixedly connected to the heat-conducting connecting tube; the plurality of heat-conducting annular plates are arranged at intervals in the axial direction of the heat-conducting connecting tube.

[0012] Based on the above solution, multiple heat-conducting annular sheets are fixed to the heat-conducting connecting barrel, which is then connected to the heating rod via the heat-conducting connecting barrel, thereby achieving a connection between the multiple heat-conducting annular sheets and the heating rod. The assembly method is convenient and reliable. The heat-conducting connecting barrel can be used to position the multiple heat-conducting annular sheets and the heating rod, and the installation position is accurate and reliable. At the same time, the multiple heat-conducting annular sheets work together to achieve heat conduction, with a large contact area with the medium and high heat conduction efficiency.

[0013] In an optional embodiment, the heat-conducting annular sheet extends in a broken line or curved line shape in its circumferential direction.

[0014] Based on the above solution, the surface area of the heat-conducting annular plate is large, the contact area with the medium is large, and the heat-conducting efficiency is high. Wherein, the heat-conducting annular plate can be a broken line ring plate or a wave-shaped ring plate.

[0015] In an optional embodiment, the heating unit also includes an annular sealing boss, which is sleeved on the outside of the heating rod and fixedly connected to the heating rod; the annular sealing boss separates the heating rod into a first axis segment and a second axis segment located on both sides of the annular sealing boss, the fin is sleeved on the outside of the first axis segment, and the fin and the annular sealing boss have a distance; the positive electrode sheet and the negative electrode sheet are installed on the second axis segment.

[0016] Based on the above solution, by providing an annular sealing boss, the sealing at the connection point between the heating unit and the ceramic heater housing can be ensured when the two are assembled, and the problem of medium leakage is unlikely to occur during operation, thereby improving the safety of the operation process. At the same time, there is a distance between the fins and the annular sealing boss. During the heat conduction process, the fins are unlikely to transfer heat to the positive and negative electrode sheets. In other words, it is unlikely to transfer heat to the device cavity inside the housing, which is unlikely to cause the temperature of other components in the device cavity to be too high, thus ensuring the normal operation of the ceramic heater.

[0017] In an optional embodiment, the ceramic heater further includes a sealing ring, which is sleeved on the outside of the second shaft segment.

[0018] Based on the above solution, the sealing performance at the connection position between the heating unit and the shell can be enhanced.

[0019] In an optional embodiment, the ceramic heater further includes a shell and a partition, wherein the partition is disposed in the shell and cooperates with the shell to form a mutually independent water chamber cavity and equipment cavity, and the fin is located in the water chamber cavity; the second shaft segment passes through the partition, and the sealing ring is clamped between the partition and the annular sealing boss; the positive electrode plate and the negative electrode plate are both located in the equipment cavity.

[0020] Based on the above solution, the water chamber cavity and the equipment cavity are separated, and the gap between the second shaft section and the partition is sealed by a sealing ring. The medium in the water chamber cavity is not easy to leak into the equipment cavity, and is not easy to affect the normal operation of the components in the equipment cavity.

[0021] In an optional embodiment, the ceramic heater further comprises a busbar circuit board, and the busbar circuit board is installed in the equipment cavity;

[0022] There are multiple heating units, and the positive and negative electrode sheets of all the heating units are electrically connected to the busbar circuit board.

[0023] Based on the above scheme, by setting up multiple heating units, multiple heating units can work simultaneously to improve the heating efficiency; and the positive and negative plates of the multiple heating units are connected to the bus circuit board, which is convenient for assembly, and the bus circuit board plays the role of convergence and control, and there is no need to set up an additional control circuit board, which simplifies the structure, saves costs, and reduces the difficulty of assembly.

[0024] In an optional embodiment, the fins are fixed to the heating rod by welding or bonding.

[0025] Based on the above solution, the connection methods between the fin and the heating rod are diverse, flexible to choose and easy to assemble.

[0026] The beneficial effects of the embodiments of the present utility model are:

[0027] To sum up, the ceramic heater provided in this embodiment has fins arranged outside the heating rod. When the positive and negative electrodes are energized, the resistance wire converts electrical energy into thermal energy to generate heat. The heat is conducted to the fins through the heating rod. The heating rod and the fins are both immersed in the medium, with a large contact area with the medium and good thermal conductivity. The temperature of the medium is quickly raised to the required temperature, and the thermal conductivity efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of a heating unit according to an embodiment of the present invention;

[0030] Figure 2 This is an exploded schematic diagram of a heating unit according to an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of a fin according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the assembly of a ceramic heater according to an embodiment of the present invention;

[0033] Figure 5 This is a first exploded schematic diagram of a ceramic heater according to an embodiment of the present invention;

[0034] Figure 6 This is a second exploded schematic diagram of the ceramic heater according to an embodiment of the present invention.

[0035] icon:

[0036] 100-heating unit; 110-heating rod; 111-first shaft section; 112-second shaft section; 130-positive electrode; 140-negative electrode; 150-fin; 151-thermal connection tube; 152-thermal annular sheet; 160-annular sealing boss; 170-sealing ring; 171-first ring body; 172-second ring body; 200-housing; 210-water chamber housing; 211-water inlet connector; 212-water outlet connector; 220-controller housing; 300-partition; 310-assembly hole; 400-bus circuit board. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0040] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0042] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0043] In the prior art, a PTC heating element is clamped between two flow channels, for example, between two flat tubes. The PTC heating element adheres to the channel wall, and only at this contact point can the heat from the PTC heating element be transferred to the channel wall, thereby heating the medium. This results in a small contact area between the PTC heating element and the medium, resulting in low thermal conductivity. Furthermore, the PTC heating element has a complex structure and is difficult to assemble.

[0044] In view of this, the designer provides a ceramic heater with a simple structure, easy processing and manufacturing, high thermal conductivity and low energy consumption.

[0045] Please combine Figure 1-Figure 3In this embodiment, the ceramic heater includes a heating unit 100, which includes a heating rod 110 made of alumina ceramic, a resistance wire (not shown), a positive electrode sheet 130, a negative electrode sheet 140 and a fin 150. The resistance wire is arranged in the heating rod 110, and the positive electrode sheet 130 and the negative electrode sheet 140 are both electrically connected to the resistance wire; the fin 150 is sleeved on the outer peripheral surface of the heating rod 110 and is fixedly connected to the heating rod 110.

[0046] Based on the above, the working principle of the ceramic heating unit 100 provided in this embodiment is as follows:

[0047] The heating unit 100 is matched with the water chamber cavity, so that the fins 150 and part of the heating rod 110 are located in the water chamber cavity. The positive electrode 130 and the negative electrode 140 are connected to the power supply. When the power is turned on, the current flows through the resistance wire, which converts the electrical energy into heat energy. The generated heat is transferred to the fins 150 through the heating rod 110. The fins 150 are in contact with the medium and are immersed in the medium. The contact area with the medium is large, the heat conduction area is large, the heat conduction efficiency is high, and energy consumption is reduced.

[0048] At the same time, the heating unit 100 has a simple structure, is easy to manufacture, and has a low manufacturing cost.

[0049] The following embodiments illustrate the details of the ceramic heater of the present application by way of examples.

[0050] Please combine Figures 1-6 In this embodiment, the ceramic heater includes a heating unit 100, a housing 200, a partition 300, and a busbar circuit board 400. The heating unit 100 passes through the partition 300. Part of the heating unit 100 is located in the water chamber defined by the housing 200 and the partition 300. The remaining portion of the heating unit 100 is located in the device cavity defined by the partition 300 and the housing 200. The busbar circuit board 400 is located in the device cavity. The heating unit 100 is electrically connected to the busbar circuit board 400. The busbar circuit board 400 can be connected to a power source to transmit power to the heating unit 100.

[0051] It should be understood that the number of heating units 100 can be one or more. When the number of heating units 100 is multiple, multiple heating units 100 cooperate to heat simultaneously, thereby improving heating efficiency. All heating units 100 are connected to the busbar circuit board 400 for easy assembly. For example, in this embodiment, the number of heating units 100 can be four, and the four heating units 100 are arranged in two rows and two columns to rationally utilize the water chamber cavity space. It should be noted that the structures of all heating units 100 can be set to be the same. In order to avoid repeated descriptions, this embodiment is described using one heating unit 100 as an example.

[0052] Please combine Figure 1 and Figure 2 Optionally, the heating unit 100 includes a heating rod 110, a resistance wire, a positive electrode sheet 130, a negative electrode sheet 140, a fin 150, an annular sealing boss 160 and a sealing ring 170. The heating rod 110 is made of alumina ceramic, and the resistance wire and the heating rod 110 are sintered into one piece. A metal layer can be sintered on the outer peripheral surface of the heating rod 110. The resistance wire can be distributed in a serpentine shape inside the heating rod 110, which can increase the heating area of the resistance wire and improve the heating efficiency. The positive electrode sheet 130 and the negative electrode sheet 140 are both installed on the heating rod 110 and electrically connected to the resistance wire. The fin 150 can be welded to the metal layer on the outer peripheral surface of the heating rod 110 or adhesively fixed to the outer peripheral surface of the heating rod 110. The annular sealing boss 160 is sleeved on the outside of the heating rod 110, and the sealing ring 170 is sleeved on the outside of the heating rod 110 and contacts one end face of the annular sealing boss 160.

[0053] Optionally, the cross-sectional profile of the heating rod 110 can be circular or annular. When the cross-sectional profile of the heating rod 110 is circular, the heating rod 110 is a solid rod, and the heating rod 110 can also be called a heating rod or a heating column. When the cross-sectional profile of the heating rod 110 is annular, the heating rod 110 is a hollow rod, and the heating rod 110 can also be called a heating tube. The heating tube requires less consumables, is low in cost, and is lightweight.

[0054] At the same time, the annular sealing boss 160 can be a circular ring structure, which is sleeved on the outside of the heating rod 110 and can be set as an integrated structure with the heating rod 110. The annular sealing boss 160 is located between the two ends of the heating rod 110. The annular sealing boss divides the heating rod 110 into a first shaft section 111 and a second shaft section 112 located on both sides of the annular sealing boss 160. The length of the first shaft section 111 is greater than the length of the second shaft section 112. During assembly, the fin 150 is sleeved on the outside of the first shaft section 111, and there is a distance between the fin 150 and the annular sealing boss 160. The positive electrode sheet 130 and the negative electrode sheet 140 are both installed on the second shaft section 112 and are arranged symmetrically. For example, the positive electrode sheet 130 and the negative electrode sheet 140 are both attached to the outer circumferential surface of the second shaft section 112. The sealing ring 170 is sleeved on the outside of the second shaft section 112 and contacts the annular sealing boss 160 . The positive electrode sheet 130 and the negative electrode sheet 140 are inserted into the sealing ring 170 . The sealing ring 170 also stabilizes the positions of the positive electrode sheet 130 and the negative electrode sheet 140 .

[0055] Furthermore, the sealing ring 170 is set to a stepped structure, and the sealing ring 170 includes a coaxial first ring body 171 and a second ring body 172. The outer diameter of the first ring body 171 is smaller than the outer diameter of the second ring body 172. The second shaft section 112 is simultaneously passed through the first ring body 171 and the second ring body 172. The end face of the second ring body 172 contacts the annular sealing boss 160. The first ring body 171 is inserted into the assembly hole 310. In this way, the first ring body 171 can be squeezed through the hole wall of the assembly hole 310, so that the first ring body 171 is tightly attached to the outer peripheral surface of the second shaft body to form a sealing portion. At the same time, the annular sealing boss 160 and the partition 300 cooperate to clamp the second ring body 172 to form another sealing portion. The two sealing portions cooperate to improve the sealing effect.

[0056] Please combine Figure 3 In this embodiment, optionally, the fin 150 includes a heat-conducting connecting tube 151 and a plurality of heat-conducting annular sheets 152. The heat-conducting connecting tube 151 can be a circular tube. The heat-conducting connecting tube 151 is sleeved on the outside of the first shaft section 111 of the heating rod 110. The heat-conducting connecting tube 151 and the heating rod 110 can be fixed by welding or bonding. The plurality of heat-conducting annular sheets 152 are all sleeved on the outside of the heat-conducting connecting tube 151 and fixedly connected to the heat-conducting connecting tube 151. The plurality of heat-conducting annular sheets 152 are evenly spaced and arranged in the axial direction of the heat-conducting connecting tube 151. There is a spacing between adjacent heat-conducting annular sheets 152, which is conducive to the medium wrapping the heat-conducting annular sheets 152. The plurality of heat-conducting annular sheets 152 can be set as an integrated structure with the heat-conducting annular tube. It should be understood that the number of heat-conducting annular sheets 152 is set as needed and is not specifically limited in this embodiment.

[0057] Furthermore, the heat-conducting annular plate 152 extends in a zigzag or curved shape around its circumference. For example, the heat-conducting annular plate 152 may be a zigzag or wavy ring plate. This design provides a large surface area for the heat-conducting annular plate 152, a large contact area with the medium, and high heat conduction efficiency.

[0058] Please combine Figure 4-Figure 6 In this embodiment, the housing 200 optionally includes a water chamber housing 210 and a controller housing 220. The water chamber housing 210 and the controller housing 220 cooperate to clamp the partition 300, and the partition 300 also seals against the water chamber housing 210 and the controller housing 220. For example, an annular seal may be provided between the partition 300 and the water chamber housing 210, and an annular seal may be provided between the partition 300 and the controller housing 220. The water chamber housing 210 and the partition 300 cooperate to define a sealed water chamber cavity, and the controller housing 220 and the partition 300 cooperate to define a sealed device cavity. The water chamber cavity and the device cavity are independent of each other.

[0059] Furthermore, the separator 300 is provided with a plurality of assembly holes 310, the number of which is equal to the number of the heating rods 110. During assembly, the second shaft section 112 of the heating rod 110 is inserted into the assembly holes 310. The sealing ring 170 is clamped by the annular sealing boss 160 and the separator 300. After elastic deformation, the sealing ring 170 seals the gap between the second shaft section 112 and the separator 300. The fins 150 and the first shaft section 111 are located within the water chamber, and the positive electrode sheet 130 and the negative electrode sheet 140 connected to the second shaft section 112 are located within the device cavity.

[0060] It should be understood that the water chamber shell 210 is provided with a water inlet joint 211 and a water outlet joint 212 communicating with the water chamber cavity.

[0061] In this embodiment, optionally, the busbar circuit board 400 is a PCB busbar, which is installed in the equipment cavity, and the positive electrode sheet 130 and the negative electrode sheet 140 of each heating unit 100 are plugged into and matched with the busbar circuit board 400 and electrically connected to the busbar circuit board 400.

[0062] In this embodiment, the ceramic heater immerses the fins 150 in the medium through the cooperation of the heating rod 110 and the fins 150. The fins 150 have a large contact area with the medium, high thermal conductivity, low energy consumption, and low operating costs. At the same time, the ceramic heater has a simple structure, is easy to process and manufacture, and is light in weight.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A ceramic heater, characterized in that: include: A heating unit (100) comprises a heating rod (110) made of alumina ceramic, a resistance wire, a positive electrode sheet (130), a negative electrode sheet (140), and a fin (150); the resistance wire is arranged in the heating rod (110); the positive electrode sheet (130) and the negative electrode sheet (140) are both electrically connected to the resistance wire; and the fin (150) is sleeved on the outer peripheral surface of the heating rod (110) and fixedly connected to the heating rod (110).

2. The ceramic heater according to claim 1, wherein: The resistance wire and the heating rod (110) are sintered into an integrated structure.

3. The ceramic heater according to claim 1, wherein: The heating rod (110) is provided with a through hole extending in its own axial direction.

4. The ceramic heater according to claim 1, wherein: The fin (150) includes a heat-conducting connecting tube (151) and a plurality of heat-conducting annular sheets (152), wherein the heat-conducting connecting tube (151) is sleeved on the outside of the heating rod (110), and the plurality of heat-conducting annular sheets (152) are all sleeved on the outside of the heat-conducting connecting tube (151) and fixedly connected to the heat-conducting connecting tube (151); the plurality of heat-conducting annular sheets (152) are arranged at intervals in the axial direction of the heat-conducting connecting tube (151).

5. The ceramic heater according to claim 4, characterized in that: The heat-conducting annular sheet (152) extends in a zigzag or curved shape in its circumferential direction.

6. The ceramic heater according to claim 1, wherein: The heating unit (100) further includes an annular sealing boss (160), which is sleeved on the outside of the heating rod (110) and fixedly connected to the heating rod (110); the annular sealing boss (160) separates the heating rod (110) into a first shaft section (111) and a second shaft section (112) located on both sides of the annular sealing boss (160); the fin (150) is sleeved on the outside of the first shaft section (111), and the fin (150) and the annular sealing boss (160) are spaced apart; the positive electrode sheet (130) and the negative electrode sheet (140) are mounted on the second shaft section (112).

7. The ceramic heater according to claim 6, characterized in that: The ceramic heater further comprises a sealing ring (170), and the sealing ring (170) is sleeved on the outside of the second shaft section (112).

8. The ceramic heater according to claim 7, characterized in that: The ceramic heater further comprises a shell (200) and a partition (300), wherein the partition (300) is arranged in the shell (200) and cooperates with the shell (200) to form a water chamber cavity and an equipment cavity that are independent of each other, and the fin (150) is located in the water chamber cavity; the second shaft section (112) passes through the partition (300), and the sealing ring (170) is clamped between the partition (300) and the annular sealing boss (160); the positive electrode sheet (130) and the negative electrode sheet (140) are both located in the equipment cavity.

9. The ceramic heater according to claim 8, characterized in that: The ceramic heater further comprises a busbar circuit board (400), and the busbar circuit board (400) is installed in the equipment cavity; There are multiple heating units (100), and the positive electrode sheets (130) and negative electrode sheets (140) of all the heating units (100) are electrically connected to the busbar circuit board (400).

10. The ceramic heater according to claim 1, wherein: The fin (150) is fixed to the heating rod (110) by welding or bonding.

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