Heat exchange tube for gas water heater

Abstract

The utility model relates to the technical field of heating and heat exchange equipment, in particular to a heat exchange tube for a gas water heater. Comprising an inner container body and a heat exchange pipe welded on the inner container, a water inlet pipe and a water outlet pipe are connected to the inner container body, the bottom of the heat exchange pipe is sealed, a partition plate used for partitioning the internal space of the heat exchange pipe is arranged in the heat exchange pipe, one side of the partition plate is an air inlet channel, the other side of the partition plate is an air outlet channel, and a gap is reserved in the position, close to the bottom of the heat exchange pipe, of the partition plate. The heat exchange tube only needs to be welded on the inner container once, a fuel gas inlet and a fuel gas outlet are close to each other, and the structure is more compact. And on the premise of the same heat exchange area, the heat exchange efficiency is better.

Description

Technical Field

[0001] The utility model relates to the technical field of water heater liners, and particularly relates to a heat exchange tube for a gas water heater. Background Art

[0002] The principle of a gas water heater is that inlet and outlet water pipes are arranged on the water heater liner, and a heat exchange tube is additionally installed. In the heat exchange tube, a gas-air mixture in a combustion reaction conducts heat through the heat exchange tube to the cold water in the liner to achieve the heating function.

[0003] The shape of the heat exchange tube in the prior art can refer to a water heater liner with a heat exchange tube disclosed in Chinese Patent Publication No.: CN218821020U, which was authorized and announced on April 7, 2023. It includes a liner body, an ignition circuit arranged outside the liner body, and further includes a U-shaped heat exchange tube and an electric heating tube. The electric heating tube is fixedly connected to the liner body through a flange nut. The U-shaped heat exchange tube includes an input straight tube with a heat source input end, an output straight tube with a heat source output end, and an arc-shaped elbow connecting the input straight tube and the output straight tube. On the side of the liner body far from the U-shaped heat exchange tube and the electric heating tube, there are respectively a water inlet pipe and a water outlet pipe communicating with the inside of the liner body. There is also a flange inspection port on the liner body between the water inlet pipe and the water outlet pipe, and a cover for blocking the flange inspection port is also provided on the flange inspection port. A first enamel layer is also provided on the outer wall of the U-shaped heat exchange tube located inside the liner body, and a second enamel layer is provided on the inner wall of the liner body. This design has the advantages of high overall corrosion resistance, uniform heating and temperature rise, and the ability to supply multiple heat sources.

[0004] However, the installation process of the U-shaped heat exchange tube adopted in this design is relatively cumbersome. When the gas is discharged from the output straight tube after being ignited, the gas temperature is still about 400°C, indicating that the heat generated by it is not well conducted to the cold water in the liner. Summary of the Utility Model

[0005] Aiming at the deficiencies existing in the prior art, the purpose of the present utility model is as follows:

[0006] First, to provide a heat exchange tube for a gas water heater, by improving the shape of the heat exchange tube, the process of installing the heat exchange tube onto the liner body is made simpler and more reliable.

[0007] Second, to provide a heat exchange tube for a gas water heater, by improving the shape of the heat exchange tube, the heat exchange efficiency of the heat exchange tube is made better.

[0008] To achieve the above object, the utility model provides the following technical solution: A heat exchange tube for a gas water heater, including a heat exchange tube welded to the inner tank body, the bottom of the heat exchange tube is sealed, a partition plate for separating the internal space of the heat exchange tube is arranged inside the heat exchange tube, one side of the partition plate is an air inlet passage, the other side of the partition plate is an air outlet passage, and a gap is left near the bottom of the heat exchange tube by the partition plate.

[0009] Through the design of the partition plate in this technical solution, a U-shaped combustion chamber is formed inside the heat exchange tube. The gas-air mixture enters from the air inlet passage and is ignited. During the combustion reaction process, the tube wall of the heat exchange tube is heated, and the heat is conducted to the cold water in the inner tank body. Compared with the existing U-shaped heat exchange tube design scheme, the advantage of this design is that the heat exchange tube only needs to be welded once on the inner tank body and the gas inlet and outlet are relatively close, and the structure is more compact. On the premise of the same heat exchange area, there is better heat exchange efficiency.

[0010] Optionally, the whole heat exchange tube is in a cylindrical barrel shape.

[0011] The heat exchange tube is in a cylindrical shape, so that the orthographic projection shape of the connection part between it and the inner tank body is circular, which is convenient for opening holes in the inner tank body and the welding process when it is installed on the inner tank body.

[0012] Optionally, installation holes for installing an ignition device and a gas input device are arranged at one end of the partition plate far from the bottom of the heat exchange tube.

[0013] Optionally, the bottom of the heat exchange tube is arc-shaped, preferably hemispherical.

[0014] The bottom of the hemispherical shape has a uniform thickness, which can make the heat exchange medium inside the heat exchange tube flow more smoothly.

[0015] Optionally, the partition plate is located in the middle of the heat exchange tube, and the cross-sectional area of the air inlet passage is smaller than that of the air outlet passage.

[0016] Optionally, a water inlet pipe and a water outlet pipe are connected to the inner tank body, and the length of the water outlet pipe entering the inner tank body is greater than the length of the water inlet pipe entering the inner tank body.

[0017] When the whole device is installed upside down, the opening of the heat exchange tube is at the lower part. At this time, the heat exchange tube heats the liquid in the device, causing it to generate a circular convection. At this time, the horizontal height of the water outlet pipe should be higher than the horizontal height of the water inlet pipe, so that there is always enough liquid in the device to form a convection.

[0018] Optionally, the water inlet pipe, the water outlet pipe, and the heat exchange tube are all arranged at one end of the inner tank body.

[0019] Optionally, a connection bracket is welded to the other end of the inner tank body.

[0020] The beneficial technical effects of the present utility model are as follows: The heat exchange tube only needs to be welded to the inner tank once, and the gas inlet and outlet are relatively close, so the structure is more compact. Under the premise of the same heat exchange area, it has better heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present utility model;

[0022] Figure 2 is a partial cross-sectional structural diagram of the present utility model;

[0023] Figure 3 is a three-dimensional schematic diagram of the heat exchange tube in the present utility model.

[0024] Reference numerals: 1-inner tank body, 2-heat exchange tube, 3-water inlet pipe, 4-water outlet pipe, 5-connection bracket, 6-separator plate, 7-intake channel, 8-outlet channel, 9-mounting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present utility model will be further described in detail below with reference to the drawings and embodiments. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component, respectively.

[0026] Refer to Figure 1 、 2 As shown in FIGS. 3, a gas water heater includes an inner tank body 1 and a heat exchange tube 2 welded to the inner tank.

[0027] The inner tank body 1 is integrally in the shape of a cylindrical barrel, and the cross-sectional profiles at its upper and lower ends are both circular arcs.

[0028] The upper end of the inner tank body 1 is connected with a water inlet pipe 3 and a water outlet pipe 4, and the lower end is welded with a connection bracket 5.

[0029] The heat exchange tube 2 is located at the upper end of the inner tank body 1 and is integrally in the shape of a cylindrical barrel. Its bottom is hemispherical and sealed. A separator plate 6 for separating the internal space of the heat exchange tube 2 is provided inside the heat exchange tube 2. One side of the separator plate 6 is an intake channel 7, and the other side is an outlet channel 8. A gap is left near the bottom of the heat exchange tube 2 for the heat exchange medium to pass through. An installation hole 9 for installing an ignition device and a gas input device is provided at one end of the separator plate 6 far from the bottom of the heat exchange tube 2. The cross-sectional area of the intake channel 7 is smaller than the cross-sectional area of the outlet channel 8.

[0030] This technical solution forms a U-shaped combustion chamber in the heat exchange tube 2 through the design of the partition plate 6. The gas-air mixture enters from the air inlet channel 7 and is ignited. During the combustion reaction, the tube wall of the heat exchange tube 2 is heated and the heat is transferred to the cold water in the inner tank. Compared with the existing U-shaped heat exchange tube 2 design, the advantage of this design is that the heat exchange tube 2 only needs a single welding on the inner tank and the gas inlet and outlet are closer, and the structure is more compact. Under the premise of equal heat exchange area, it has better heat exchange efficiency.

[0031] After experiments, under the premise of the same heat exchange area and the same gas-air mixed gas input, the gas temperature detected at the outlet of the gas outlet channel 8 in this solution is around 280°C, while in the solution using the U-shaped heat exchange tube in the prior art, the outlet gas temperature is around 400°C. Obviously, the heat exchange tube 2 with the partition plate 6 used in this solution has a better heat exchange efficiency.

[0032] The shape of the heat exchange tube 2 is cylindrical, so that the orthographic projection of the connection between it and the inner tank is circular, which is convenient for the opening and welding process of the inner tank when it is installed on the inner tank.

[0033] The thickness of the hemispherical bottom is uniform, which can make the heat exchange medium inside the heat exchange tube 2 flow more smoothly.

[0034] The above is only the preferred implementation of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A heat exchange tube for a gas water heater, characterized in that: It includes a heat exchange tube welded on the inner tank body, the bottom of the heat exchange tube is sealed, a partition plate for dividing the internal space of the heat exchange tube is arranged inside the heat exchange tube, one side of the partition plate is an air inlet channel, the other side of the partition plate is an air outlet channel, and a gap is left near the bottom of the heat exchange tube on the partition plate.

2. A heat exchange tube for a gas water heater according to claim 1, characterized in that: The heat exchange tube is in a cylindrical barrel shape as a whole.

3. The heat exchange tube for a gas water heater according to claim 1, characterized in that: The end of the partition plate farthest from the bottom of the heat exchange tube is provided with a mounting hole for mounting an ignition device and a gas input device.

4. A heat exchange tube for a gas water heater according to claim 1, characterized in that: The bottom of the heat exchange tube is arc-shaped.

5. The heat exchange tube for a gas water heater according to claim 1, characterized in that: The partition plate is located in the middle of the heat exchange tube, and the cross-sectional area of ​​the air inlet channel is smaller than the cross-sectional area of ​​the air outlet channel.

6. A heat exchange tube for a gas water heater according to any one of claims 1 to 5, characterized in that: The inner tank body is connected with a water inlet pipe and a water outlet pipe, and the length of the water outlet pipe entering the inner tank body is greater than the length of the water outlet pipe entering the inner tank body.

7. A heat exchange tube for a gas water heater according to claim 6, characterized in that: The water inlet pipe, the water outlet pipe and the heat exchange pipe are all arranged on one end of the inner tank body.

8. The heat exchange tube for a gas water heater according to claim 7, characterized in that: A connecting bracket is welded on the other end of the inner tank body.

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