CN201547959U - Spiral single tube condensing heat exchanger - Google Patents

Abstract

The utility model discloses a spiral single-tube condensing heat exchanger, which comprises an outer casing, a smoke inlet, a smoke outlet and a heat exchanging tube, wherein the smoke inlet and the smoke outlet are arranged on the outer casing, and the heat exchanging tube is arranged inside the outer casing. The spiral single-tube condensing heat exchanger is characterized in that the heat exchanging tube is a single stainless steel corrugated tube and spirally distributed inside the outer casing. By adopting the spirally distributed single stainless steel corrugated tube as a heat exchanging element, the spiral single-tube condensing heat exchanger is not only simple in structure and easy to be processed, but also reasonable in part distribution and high in heat exchanging efficiency.

Description

Spiral single tube condensing heat exchanger

technical field

The utility model relates to the technical field of heat exchangers, in particular to a spiral single-pipe condensing heat exchanger for gas water heaters.

Background technique

The condensing heat exchanger for gas water heaters can further cool the exhausted flue gas, condense the water vapor in the exhausted flue gas and release the latent heat of vaporization to improve the efficiency of the water heater. It is a high-efficiency and energy-saving product. The existing condensing heat exchangers for gas water heaters mainly have two structures. One is the finned tube structure. This structure is to arrange heat exchange fins outside the water pipes, collect heat through the fins and conduct it to the water pipes. Cold water is used for heat exchange. In order to ensure heat exchange efficiency, the current condensing heat exchanger with finned tube structure is mainly made of copper, so the cost is relatively high. In addition, in order to prevent corrosion, it is necessary to add anti-corrosion coating to the outer surface of the fins and water tubes. layer, which further increases the production cost; there is another kind of bellows structure, using stainless steel bellows as heat exchange elements, the corrosion resistance of stainless steel is greatly enhanced, but due to the bending of stainless steel bellows has a certain limit, the bellows in the heat exchange The uneven distribution in the device is the biggest bottleneck of the bellows structure condensing heat exchanger at present. In order to achieve a better heat exchange effect, a patent has proposed a spirally distributed bellows heat exchanger. For example, the Chinese patent application number is CN200820052420.4, and the application date is March 4, 2008. The patent name is Condenser for gas water heaters. A utility model patent for a gas-fired water heater, which discloses a condensing heat exchanger for a gas water heater, including a heat exchange chamber, a heat exchange tube, a smoke inlet, a smoke exhaust port, a cold water inlet, and a hot water outlet. The condensed water outlet in the heat exchange chamber. The heat exchange chamber is composed of the heat exchanger shell and the heat exchanger inner cylinder to form a channel with a circular cross section. The heat exchanger inner cylinder and the heat exchanger shell are respectively connected to the smoke inlet and exhaust The smoke port is connected, and the heat exchange tubes are arranged in the heat exchange chamber in the form of spiral tubes. The flue gas moves along the axis of the heat exchange chamber and contacts the heat exchange tubes in the heat exchange chamber. When the utility model works, the flue gas moves along the annular channel, contacts with the spiral heat exchange tube arranged therein and performs heat exchange. In this utility model, the heat exchange tubes are arranged in a spiral form, which can increase the heat exchange area, but the distance between the smoke inlet and the smoke exhaust port of this utility model is too close, so that most of the smoke has been discharged before heat exchange is performed. Moreover, a cylindrical structure is also set to block the contact between the flue gas and the bellows, so the overall heat exchange efficiency is not high.

Contents of the invention

The utility model provides a spiral single-tube condensation heat exchanger to solve the above-mentioned technical deficiencies. A single stainless steel corrugated pipe with spiral distribution is used as the heat exchange element. It not only has a simple structure and is easy to process, but also has a reasonable distribution of components , High heat exchange efficiency.

The utility model adopts the following technical scheme to achieve the above object: a spiral single-tube condensing heat exchanger, including a shell, a smoke inlet and a smoke exhaust port arranged on the shell, and a heat exchange tube set in the shell. It is characterized in that the heat exchange tube is a single stainless steel corrugated tube and is spirally distributed inside the shell.

As a further description of the above solution, the heat exchange tubes are spirally distributed along the inner wall of the housing to form a cylindrical structure.

The top of the heat exchange tube is provided with a cone-shaped deflector, and the deflector is arranged below the smoke exhaust port. The conical top of the deflector points to the bottom end of the heat exchange tube along the central axis of the cylindrical heat exchange tube. The bottom end of the deflector points to the smoke exhaust port.

The heat exchange tubes are spirally distributed in the shell to form a cone structure, the bottom end of the cone structure is set at the smoke inlet, and the top end is set at the smoke exhaust port.

The heat exchange tube is provided with a water inlet and a water outlet, the water inlet is the starting end of the heat exchange tube helical structure set at the inner bottom of the shell, and the water outlet is set at the end end of the inner top of the shell by the heat exchange tube helical structure to the shell Extended bottom composition.

The shell is a round or square cylindrical structure, the smoke outlet is set on the top of the shell, and the smoke inlet is set on the side of the lower end of the shell.

The bottom of the housing is also provided with a condensation water outlet.

The beneficial effects that the utility model can achieve by adopting the above technical scheme are:

1. The utility model adopts a single stainless steel bellows spirally arranged into a cylinder or a cone as a heat exchange element. The high-temperature flue gas enters from the bottom of the condensation heat exchanger cavity and is discharged from the top. The contact area is large and the heat exchange efficiency is high. It is also possible to selectively set deflectors at the smoke outlet at the top of the cylindrical heat exchanger, so that the flue gas flows to the surrounding bellows and then discharged upwards, increasing the stay of the flue gas in the heat exchanger time, further improving the heat transfer efficiency.

2. The heat exchange element of the utility model is a single helically distributed corrugated tube, which is simple in manufacturing process and convenient for installation and maintenance. Moreover, the corrugated tube is made of stainless steel and has strong corrosion resistance, so no additional corrosion-resistant coating is required. , so the cost is lower.

3. The cold water of the heat exchange element of the utility model is first conveyed from the bottom of the heat exchanger to the top of the heat exchanger by a straight pipe, then spirally descends from the top to the bottom, and finally is output from the bottom. The whole process of cold water and flue gas The heat exchange time is longer, so the heat exchange efficiency is greatly improved.

Description of drawings

Fig. 1 shows the structural representation of the utility model embodiment one;

Fig. 2 is a schematic structural diagram of Embodiment 2 of the present utility model.

Explanation of reference signs: 1. shell, 2. smoke inlet, 3. smoke exhaust, 4. stainless steel bellows, 5. deflector, 6. water inlet, 7. water outlet, 8. condensed water outlet.

Detailed ways

For further setting forth the utility model structure and function, the utility model is described in detail below in conjunction with accompanying drawing and preferred embodiment:

Embodiment one

As shown in Figure 1, the utility model discloses a spiral single-tube condensation heat exchanger, which includes a shell, a smoke inlet and a smoke exhaust port arranged on the shell, and a heat exchange tube set in the shell. The shell is a cylindrical structure, the smoke outlet is set on the top of the shell, and the smoke inlet is set on the lower side of the shell; the heat exchange tube is a single stainless steel bellows and is spirally distributed along the inner wall of the shell to form a cylindrical structure. There is a water inlet and a water outlet. The water inlet is the starting end of the helical structure of the heat exchange tube. The starting end is located at the inner bottom of the shell. It is arranged on the inner top of the shell; there is also a cone-shaped deflector below the smoke exhaust port, and the conical top of the deflector points to the bottom end of the cylindrical structure formed by the heat exchange tube along the central axis of the cylindrical structure. The round opening on the bottom of the deflector is directed to the smoke outlet; there is also a condensate outlet on the bottom of the shell.

When this embodiment is working, high-temperature flue gas enters from the smoke inlet below, and rises to the smoke exhaust port after reverse heat exchange with the cold water in the bellows. The flue gas spreads to the surrounding bellows, prolonging the residence time of the flue gas in the heat exchanger to improve the heat exchange efficiency.

Embodiment two

As shown in Figure 2, the difference between this embodiment and Embodiment 1 is that the heat exchange tubes are a single stainless steel bellows spirally arranged into a cone-shaped structure, and the deflector at the top of the shell is canceled. , the structures and functions of this embodiment are completely consistent with those of Embodiment 1. In this embodiment, the high-temperature flue gas enters from the lower smoke inlet, and exchanges heat with the cold water in the bellows in reverse. Since the bellows is tapered, the high-temperature flue gas will not be directly discharged from the top. After sufficient heat exchange with the bellows, Then exhaust it from the exhaust port.

Embodiment three

The only difference between this embodiment and Embodiment 1 is that the deflector at the top of the housing is canceled and the housing is in a square cylindrical structure. Other than that, the rest of the structure and functions are exactly the same as those of Embodiment 1.

The above-mentioned embodiment of the utility model and what is shown in the accompanying drawings are only one of the preferred embodiments of the utility model, and the utility model cannot be limited thereto. Any changes all belong to the protection scope of the present utility model.

Claims (7)

1. A spiral single-tube condensing heat exchanger, comprising a shell, a smoke inlet and a smoke exhaust port arranged on the shell, and a heat exchange tube arranged in the shell, characterized in that: the heat exchange tube is a single stainless steel Bellows and spirally distributed inside the housing. 2. The spiral single-tube condensing heat exchanger according to claim 1, characterized in that: the heat exchange tubes are spirally distributed along the inner wall of the casing to form a cylindrical structure. 3. The spiral single-tube condensing heat exchanger according to claim 2, characterized in that: the top of the heat exchange tube is provided with a cone-shaped deflector, and the deflector is arranged below the smoke exhaust port. The conical top of the deflector points to the bottom end of the heat exchange tube along the central axis of the cylindrical heat exchange tube, and the bottom end of the deflector fin points to the smoke exhaust port. 4. The spiral single-pipe condensing heat exchanger according to claim 1, characterized in that: the heat exchange tubes are spirally distributed in the shell to form a cone structure, and the bottom end of the cone structure is set at the smoke inlet The top is located at the exhaust port. 5. The spiral single-tube condensing heat exchanger according to any one of the above claims, characterized in that: the heat exchange tube is provided with a water inlet and a water outlet, and the water inlet is a spiral structure of the heat exchange tube and is arranged in the shell The starting end of the bottom, the water outlet is formed by extending the end end of the helical structure of the heat exchange tube on the inner top of the shell to the bottom of the shell. 6. The spiral single-tube condensing heat exchanger according to claim 1, characterized in that: the shell is a circular or square cylindrical structure, the smoke outlet is set on the top of the shell, and the smoke inlet is set at the lower end of the shell side. 7. The spiral single-tube condensing heat exchanger according to claim 1, characterized in that: the bottom of the shell is also provided with a condensed water outlet.

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