An immersion sheet-type water inlet and outlet ground contact instant heater

Abstract

The utility model relates to an immersion type sheet ground connection water inlet and outlet instant heater. Including main cavity, ceramic heating sheet, ceramic heating sheet fixed piece, water inlet ground connection ring and water outlet ground connection ring, the main cavity inner wall is the non -uniform thickness structure, and the ceramic heating sheet and ceramic heating sheet fixed piece form the symmetrical type gradually expanding section inner chamber together, and the section size increases gradually from the water inlet end to the water outlet end, the water inlet ground connection ring sets up in the main cavity bottom water inlet end, and the water outlet ground connection ring sets up in the main cavity top water outlet end. The ceramic piece heater in prior art scheme has gradually replaced the traditional metal heating tube due to the cost advantage, but most schemes do not fully consider the fluid mechanics characteristics, for example, the relationship between flow rate and pressure in Bernoulli equation, leading to uneven water distribution, low heat exchange efficiency, insufficient grounding protection, bubble accumulation and other problems further affecting the safety and service life of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of heaters, and more particularly to an immersion-type sheet-shaped inlet and outlet water grounding instantaneous heater. Background Technology

[0002] With the widespread adoption of smart homes and rapid heating devices, instant heaters have become the mainstream in the market due to their high efficiency and energy saving. Traditional heaters often use tubular heating elements combined with a fish gut-like flow channel design, which extends the contact time by forcing the water flow path to improve thermal efficiency. However, this design has significant drawbacks: firstly, the dense flow channel leads to increased pressure loss, a sharp increase in water flow resistance, and higher energy consumption; secondly, dead zones in the flow channel are difficult to avoid, and localized water flow stagnation causes uneven heating and accelerates element aging; thirdly, tubular heating elements are complex to manufacture, costly, and difficult to flatten, resulting in a large space occupation. For example, the direct-heating heater and smart toilet in patent application CN102305463B adopts a symmetrical flow channel design, but the flow channel and heating element need to be arranged vertically, which makes the structure complex and the water flow path long, resulting in a significant delay in thermal response. Another example is the compact plate-shaped instant heater in application CN202320319257.8. Although the flow channel is formed by the upper and lower cavities, there is a gap in the flow channel, which causes the water flow to deviate from the design path, resulting in insufficient contact on the surface of the heating element and the coexistence of local overheating and cold areas.

[0003] While ceramic plate heaters are gradually replacing traditional metal heating tubes due to their cost advantage, their application is still limited by the rationality of flow channel design. Most solutions do not fully consider fluid dynamics characteristics, such as the relationship between flow velocity and pressure in Bernoulli's equation, leading to uneven water flow distribution and low heat exchange efficiency. Furthermore, insufficient grounding protection and bubble accumulation further affect equipment safety and lifespan. Utility Model Content

[0004] This application provides an immersion-type plate-shaped inlet and outlet grounded instantaneous heater, which solves the technical problems in the prior art where ceramic plate heaters, although gradually replacing traditional metal heating tubes due to cost advantages, are still limited by the rationality of the flow channel design. Most solutions do not fully consider the fluid dynamics characteristics, such as the relationship between flow velocity and pressure in Bernoulli's equation, resulting in uneven water flow distribution, low heat exchange efficiency, and problems such as insufficient grounding protection and bubble accumulation, which further affect the safety and lifespan of the equipment.

[0005] The technical solution adopted in the embodiments of this application is as follows:

[0006] An immersion-type plate-shaped instantaneous heater with inlet and outlet grounding includes a main cavity, a ceramic heating element, a ceramic heating element fixing plate, an inlet grounding ring, and an outlet grounding ring. The inner wall of the main cavity has a non-uniform thickness structure, forming a symmetrical, gradually expanding cross-section cavity together with the ceramic heating element and the ceramic heating element fixing plate, with the cross-sectional dimensions gradually increasing from the inlet end to the outlet end. The inlet grounding ring is located at the inlet end of the bottom of the main cavity, and the outlet grounding ring is located at the outlet end of the top of the main cavity. The inlet grounding ring and the outlet grounding ring are connected to the main cavity through an interference fit or a sealing ring, and the minimum water passage diameter of the grounding ring is smaller than the minimum diameter of the inlet and outlet of the main cavity. The ceramic heating element is completely immersed in the inner cavity of the main cavity, dividing the water flow into symmetrically distributed water flow area A and water flow area B.

[0007] A further technical solution is as follows: the main cavity inlet end is provided with an opening structure, the water flow area A and water flow area B are symmetrically distributed relative to the ceramic heating plate, and the water flow pressure and flow rate are balanced.

[0008] A further technical solution is as follows: when the width of the ceramic heating element is less than 20mm, the inner cavity of the main cavity is simplified to a uniform cross-sectional structure, and the ceramic heating element is completely immersed in the water flow area.

[0009] A further technical solution is as follows: both the inlet grounding ring and the outlet grounding ring are provided with grounding screw holes, and the water flow is ensured to be in full contact with the grounding ring through connecting ribs.

[0010] A further technical solution is that the ceramic heating element adopts a dual-piece parallel layout to form four independent water flow zones.

[0011] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0012] 1. By employing a design including a main cavity, ceramic heating elements, ceramic heating element fixing plates, inlet grounding ring, and outlet grounding ring, and through immersion structure and optimized fluid dynamics design, the performance and reliability of the instantaneous heater are significantly improved. Firstly, the non-uniform wall thickness and gradually expanding cross-section of the inner cavity, combined with symmetrical water flow partitioning, effectively reduces pressure loss and eliminates dead zones in the flow channel, ensuring that the water flow evenly coats the ceramic heating elements, significantly improving heat exchange efficiency. Secondly, the inlet and outlet grounding rings adopt an interference fit and connecting rib structure, enhancing grounding reliability and avoiding the risk of leakage. Simultaneously, the minimal water passage design forces full contact between the water flow and the grounding ring, improving safety. The ceramic heating elements are completely immersed in the water flow area, and the dual-element parallel layout achieves flatness and miniaturization, saving installation space. The overall solution combines efficient heating, safety protection, and a compact layout, making it suitable for diverse scenarios such as smart bathrooms and instant hot water dispensers, and has broad industrial application value. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of an immersion-type sheet-like water inlet / outlet grounded instantaneous heater according to an embodiment of this utility model.

[0014] Figure 2 This is an exploded view of the overall structure of an immersion-type sheet-like water inlet / outlet grounded instantaneous heater according to an embodiment of this utility model.

[0015] Figure 3 This is a cross-sectional view of the overall structure of an immersion sheet-like inlet / outlet grounded instantaneous heater according to an embodiment of the present invention.

[0016] Figure 4 This is a partial structural schematic diagram illustrating the water flow device in an embodiment of this utility model.

[0017] In the diagram: 1. Main cavity; 2. Ceramic heating element; 3. Ceramic heating element fixing plate; 4. Inlet grounding ring; 5. Outlet grounding ring. Detailed Implementation

[0018] This application provides an immersion-type plate-shaped inlet and outlet grounded instantaneous heater, which solves the technical problems in the prior art where ceramic plate heaters, although gradually replacing traditional metal heating tubes due to cost advantages, are still limited by the rationality of the flow channel design. Most solutions do not fully consider the fluid dynamics characteristics, such as the relationship between flow velocity and pressure in Bernoulli's equation, resulting in uneven water flow distribution, low heat exchange efficiency, and problems such as insufficient grounding protection and bubble accumulation, which further affect the safety and lifespan of the equipment.

[0019] The technical solution in this application is to solve the above problems, and the overall approach is as follows:

[0020] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0021] An immersion-type sheet-like inlet / outlet grounded instantaneous heater, such as Figure 1 , Figure 2 , Figure 3 as well as Figure 4As shown, the structure includes a main cavity 1, a ceramic heating element 2, a ceramic heating element fixing piece 3, an inlet grounding ring 4, and an outlet grounding ring 5. The inner wall of the main cavity 1 has a non-uniform thickness structure, forming a symmetrical, gradually expanding cross-section inner cavity together with the ceramic heating element 2 and the ceramic heating element fixing piece 3. The cross-sectional dimensions gradually increase from the inlet end to the outlet end. The inlet grounding ring 4 is located at the bottom inlet end of the main cavity 1, and the outlet grounding ring 5 is located at the top outlet end of the main cavity 1. The inlet grounding ring 4 and the outlet grounding ring 5 are connected to the main cavity 1 by an interference fit or a sealing ring, and the minimum diameter of the water passage hole of the grounding ring is smaller than the minimum diameter of the inlet and outlet of the main cavity 1. The ceramic heating element 2 is completely immersed in the inner cavity of the main cavity 1, dividing the water flow into symmetrically distributed water flow area A and water flow area B.

[0022] The main cavity 1 has an opening structure at the water inlet end. Water flow area A and water flow area B are symmetrically distributed relative to the ceramic heating plate 2, and the water pressure and flow rate are balanced.

[0023] When the width of the ceramic heating element 2 is less than 20mm, the inner cavity of the main cavity 1 is simplified to a uniform cross-sectional structure, and the ceramic heating element 2 is completely immersed in the water flow area.

[0024] Both the inlet grounding ring 4 and the outlet grounding ring 5 are equipped with grounding screw holes, and the water flow is ensured to be in full contact with the grounding ring through connecting ribs.

[0025] The ceramic heating element 2 adopts a dual-plate parallel layout, forming four independent water flow zones.

[0026] The inner wall of the main cavity 1 has a non-uniform thickness design, forming a gradually expanding cross-section cavity together with the ceramic heating element 2 and the ceramic heating element fixing piece 3. This cavity is divided into symmetrical first, second, and third cross-sections, with the cross-sectional dimensions gradually increasing from the inlet to the outlet. An inlet grounding ring 4 is installed at the bottom inlet end of the main cavity 1, and an outlet grounding ring 5 is installed at the top outlet end. The inlet grounding ring 4 and outlet grounding ring 5 are connected to the main cavity 1 via an interference fit. Their minimum water passage diameter is smaller than the inlet and outlet diameters of the main cavity, and they are equipped with grounding screw holes and connecting ribs. The ceramic heating element 2 is completely immersed in the inner cavity, dividing the water flow into symmetrical water flow zones A and B, ensuring balanced pressure and flow rate. A cavity is provided at the outlet end of the main cavity 1 to collect air bubbles.

[0027] When water is heated to 50°C, bubbles formed by the release of dissolved gases may appear in the water. These bubbles are typically on the order of micrometers to millimeters in size. The solubility of dissolved gases such as oxygen and nitrogen decreases with increasing temperature (Henry's Law), causing them to gradually precipitate and form tiny bubbles. 50°C is far below the boiling point of water under standard atmospheric pressure (100°C), and therefore does not produce vapor bubbles.

[0028] In water at 50°C, bubbles are mainly formed by the release of dissolved gases, with a typical size of about 0.1 to 2 millimeters, depending on environmental conditions and the purity of the water.

[0029] Further, based on the laminar boundary layer, Reynolds number, and the Blasius solution relating volumetric flow rate and velocity, when the heater is operating at a pressure not exceeding 2 kg, the laminar thickness is calculated to be approximately 1.25 mm. Considering the coefficient of friction, the distance between a single heating element and the outer wall of the heater should be between 2 and 2.5 mm. The distance between the outer shell of the heater and the heating element of the MCH is between 2 and 2.5 mm. Thus, the water flow in the heater is essentially in a laminar state, resulting in a more uniform water temperature.

[0030] According to Bernoulli's equation p1+1 / 2ρv1 2 +ρgh1=p2+1 / 2ρv2 2 The cross-sectional area of ​​+ρgh2 should conform to this formula; in this utility model, the thickness of the first cross-sectional area is the increase of the thickness of the second cross-sectional area within 1mm.

[0031] To ensure consistent water pressure and flow rate in the four independent zones, each zone's ceramic heating element shares a common outlet on both sides. Zone A and Zone B form outlet A; Zone C and Zone D form outlet B. A water temperature sensor is positioned between outlet A and outlet B. The water from outlet A and outlet B mixes inside the cavity before flowing out through the heater outlet, resulting in a more uniform water temperature.

[0032] The heating zone of the ceramic heating element must be immersed in the cavity formed by the heater structure; the ceramic heating element and the ceramic heating element fixing plate are set in the cavity of the heater in a cantilever beam manner; the contact area between the ceramic heating element and the ceramic heating element fixing plate is the non-heating area of ​​the ceramic heating element; except for the non-heating area formed by the ceramic heating element and the ceramic heating element fixing plate, the other 5 surfaces of the ceramic heating element are completely immersed in the heated liquid, and the minimum gap between the ceramic heating element and the heating cavity is greater than the minimum laminar flow thickness of 1.25mm.

[0033] Operating procedures

[0034] Water enters from the bottom inlet of the main cavity 1, is guided by the inlet grounding ring 4, and then splits into water flow zones A and B, which are symmetrically distributed and have a balanced flow velocity. The water flow accelerates within the gradually expanding cross-section of the cavity, utilizing fluid dynamics to reduce local pressure and enhance heat exchange efficiency with the ceramic heating element 2. The heated water is discharged through the outlet grounding ring 5, and air bubbles that accumulate within the cavity are discharged with the water flow. In dual-element heating mode, the water flow is divided into four zones for parallel heating, improving overall heat output.

[0035] Beneficial effects

[0036] By employing a configuration including a main cavity 1, ceramic heating element 2, ceramic heating element fixing plate 3, inlet grounding ring 4, and outlet grounding ring 5, and through immersion structure and optimized fluid dynamics design, the performance and reliability of the instantaneous heater are significantly improved. Firstly, the non-uniform wall thickness and gradually expanding cross-section of the inner cavity, combined with symmetrical water flow partitioning, effectively reduce pressure loss and eliminate dead zones in the flow channel, ensuring that the water flow uniformly surrounds the ceramic heating element, significantly improving heat exchange efficiency. Secondly, the inlet and outlet grounding rings adopt an interference fit and connecting rib structure, enhancing grounding reliability and avoiding the risk of leakage. Simultaneously, the minimum water passage hole design forces full contact between the water flow and the grounding ring, improving safety. The ceramic heating element is completely immersed in the water flow area, and with a dual-element parallel layout, it achieves flattening and miniaturization, saving installation space. The overall solution combines efficient heating, safety protection, and a compact layout, making it suitable for diverse scenarios such as smart bathrooms and instant hot water dispensers, and has broad industrial application value.

[0037] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0038] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An immersion-type sheet-shaped inlet / outlet grounded instantaneous heater, characterized in that, The system includes a main cavity (1), a ceramic heating element (2), a ceramic heating element fixing piece (3), an inlet grounding ring (4), and an outlet grounding ring (5). The inner wall of the main cavity (1) has a non-uniform thickness structure, which together with the ceramic heating element (2) and the ceramic heating element fixing piece (3) forms a symmetrical gradually expanding cross-section inner cavity, with the cross-sectional size gradually increasing from the inlet end to the outlet end. The inlet grounding ring (4) is located at the bottom inlet end of the main cavity (1), and the outlet grounding ring (5) is located at the top outlet end of the main cavity (1). The inlet grounding ring (4) and the outlet grounding ring (5) are connected to the main cavity (1) by interference fit or sealing ring, and the minimum water passage diameter of the grounding ring is smaller than the minimum diameter of the inlet and outlet of the main cavity (1). The ceramic heating element (2) is completely immersed in the inner cavity of the main cavity (1), dividing the water flow into a symmetrically distributed water flow area A and water flow area B.

2. The immersion-type sheet-like inlet / outlet grounded instantaneous heater as described in claim 1, characterized in that, The main cavity (1) has an opening structure at the water inlet end. The water flow area A and water flow area B are symmetrically distributed relative to the ceramic heating plate (2), and the water flow pressure and flow rate are balanced.

3. The immersion-type sheet-like inlet / outlet grounded instantaneous heater as described in claim 1, characterized in that, When the width of the ceramic heating element (2) is less than 20 mm, the inner cavity of the main cavity (1) is simplified to a uniform cross-section structure, and the ceramic heating element (2) is completely immersed in the water flow area.

4. The immersion-type sheet-shaped inlet / outlet grounded instantaneous heater as described in claim 1, characterized in that, Both the inlet grounding ring (4) and the outlet grounding ring (5) are provided with grounding screw holes, and the water flow is ensured to be in full contact with the grounding ring through the connecting ribs.

5. The immersion-type sheet-shaped inlet / outlet grounded instantaneous heater as described in claim 1, characterized in that, The ceramic heating element (2) adopts a dual-piece parallel layout to form four independent water flow zones.

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