CN101832723A - A plate-fin heat exchanger for gas water heater - Google Patents

Abstract

The invention discloses a plate-fin heat exchanger for a gas water heater, which comprises a core body, a sealing head, an inlet connection pipe and an outlet connection pipe. The flue gas channel is composed of flue gas side fins between two metal partitions, the flue gas side fins are arranged longitudinally, and the left and right sides of the flue gas side fins are sealed by seals; the sanitary water channel is in the Water-side fins are arranged between the two metal partitions, and the water-side fins are arranged horizontally. The upper and lower sides of the water-side fins are sealed by seals, and the left and right ends are respectively connected to the two heads; the heads on both sides are respectively connected to the sanitary water inlet. The connecting pipe and the outlet connecting pipe are connected; the flue gas side fins and the water side fins are both continuous groove-shaped structures. The gas-water heat exchanger of the gas water heater of the invention has high heat exchange efficiency, reduces gas consumption, and achieves the goals of energy saving, equipment volume reduction and production cost reduction.

Description

A plate-fin heat exchanger for gas water heater

technical field

The patent of the present invention relates to a gas water heater heat exchanger, in particular to a stainless steel plate-fin heat exchanger.

technical background

my country's gas water heaters are in the process of product upgrading. At present, gas water heaters are developing in the direction of large capacity and miniaturization, and the gas-water heat exchanger is one of the main components of gas water heaters, accounting for about 1/3 of the volume of the entire gas water heater.

In traditional gas water heaters, the heat exchanger generally adopts a finned tube heat exchanger, which is usually composed of a snake-shaped round tube or an oval tube with fins added by extrusion process, and the channel inside the tube is a sanitary water channel. , outside the pipe is the flue gas channel. Since the heat exchange tubes of the tubular heat exchanger are snake-shaped, the manufacturing process requires a bending process, so its material is mainly copper or aluminum with good ductility and high thermal conductivity. In addition, in order to ensure the heat exchange strength, it is necessary to arrange a large number of fins with a large surface area and dense distribution outside the heat exchange tubes, which not only makes the overall volume of the heat exchanger larger and the manufacturing cost is higher, but also makes the side of the fins The channel resistance is relatively large, which affects the combustion conditions of the water heater combustion chamber, increases the CO content and is not conducive to the enhanced heat transfer process of the heat exchanger.

At present, copper and aluminum prices continue to rise, leading to higher and higher manufacturing costs of gas water heaters, seriously affecting their competitiveness in the water heater market. Therefore, it is necessary to develop new compact heat exchangers, reduce the volume of gas water heaters, and reduce the cost of gas water heaters.

Contents of the invention

The purpose of the present invention is to overcome the problems existing in the prior art, provide an energy-saving, high-efficiency, and environmentally friendly copper-based brazed steel plate-fin heat exchanger, improve the heat exchange efficiency of gas water heaters, save energy and reduce equipment volume ,reduce manufacturing cost.

The purpose of the present invention is achieved through the following technical solutions:

This heat exchanger is a kind of air-water heat exchanger, which has the advantages of large heat exchange area per unit volume, high heat exchange efficiency, high temperature resistance, and high pressure resistance; compared with traditional finned tube heat exchangers, The volume is reduced, the cost is significantly reduced after using stainless steel, and the performance has been greatly improved.

The plate-fin heat exchanger is realized by the following scheme: the structure of the plate-fin heat exchanger includes a core body, a head and a connecting pipe. The core body is composed of a plurality of flue gas channels and sanitary water channels that are separated and connected alternately by partitions in a rectangular cavity; the flue gas channels are provided with flue gas side fins between the two metal partitions, and the flue gas side fins are longitudinally connected to each other. Arrangement, the left and right sides of the flue gas side fins are sealed by seals; the sanitary water channel is provided with water side fins between two metal partitions, the water side fins are arranged horizontally, the upper and lower sides of the water side fins are sealed by seals, the left and right The two ends are respectively communicated with the two sealing heads; the sealing heads on both sides are respectively connected with the sanitary water inlet connecting pipe and the outlet connecting pipe.

The plate-fin heat exchanger has a reasonable structural design and is highly compact. Its working principle is as follows: Sanitary water flows in from the cold water inlet, and flows out from the hot water outlet after passing through the sanitary water channel horizontally; the flue gas flows through the flue gas channel longitudinally, and the high-temperature flue gas and sanitary water form a cross-flow, and the heat of the high-temperature flue gas It is continuously transferred to sanitary water to realize efficient heat exchange between water and flue gas.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

(1) In the patent of this invention, a stainless steel plate-fin heat exchanger is used as the gas-water heat exchanger of the gas water heater. Due to its highly compact structure, under the same heat exchange intensity, the heat exchanger consumes less material and the space volume smaller;

(2) The structure of the stainless steel plate-fin heat exchanger in the patent of the present invention does not need to adopt the twisting process, and the stainless steel with poor ductility can be used for overall brazing and welding, and the processing is easy;

(3) The flue gas side resistance of the stainless steel plate-fin heat exchanger in the patent of the invention is small, which has little influence on the combustion conditions of the combustion chamber, and its performance in high temperature resistance, pressure resistance and corrosion resistance is remarkable;

(4) Fins are also used in the sanitary water channel of the plate-fin heat exchanger in the patent of the present invention, thereby enhancing the heat exchange effect on the water side and improving the heat exchange efficiency of the heat exchanger.

Description of drawings

Fig. 1 is the structural representation of gas water heater;

Fig. 2 is a structural schematic diagram of a stainless steel plate-fin heat exchanger;

Fig. 3 is the front view of the stainless steel plate-fin heat exchanger;

Figure 4 is a top view of a stainless steel plate-fin heat exchanger;

Figure 5 is a D-D sectional view of a stainless steel plate-fin heat exchanger;

Figure 6 is an E-E sectional view of a stainless steel plate-fin heat exchanger;

Fig. 7 is a schematic diagram of a partial structure of a stainless steel plate-fin heat exchanger.

The figure shows: 1-plate-fin heat exchanger, 2-water tank, 3-heat exchange coil, 4-combustion chamber, 5-burner, 6-heat exchanger core, 7-head, 8- Cold water inlet connection, 9-hot water outlet connection, 10-partition, 11-flue gas side fins, 12-seal, 13-water side fins

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the scope described in the embodiments.

As shown in Figure 1, the heat exchange system of a gas water heater is mainly composed of a plate-fin heat exchanger 1, a water tank 2, a heat exchange coil 3, a combustion chamber 4 and a burner 5. The plate-fin heat exchanger 1 is the core component of the gas-water heat exchange system of the gas water heater. The plate-fin heat exchanger 1 is connected to the heat exchange coil 3 in the water tank 2, the water tank 2 is connected to the combustion chamber 4, and the burner 5 is arranged at the bottom of the combustion chamber 4. During operation, the high-temperature flue gas generated by the burner 5 enters the plate-fin heat exchanger 1 made of copper-based brazing stainless steel from the bottom through the combustion chamber 4, and the sanitary water enters the plate-fin heat exchanger from the side after being preheated by the heat exchange coil 3. Fin heat exchanger 1. In the cross-flow heat exchange system formed by high-temperature flue gas and sanitary water, the flue gas transfers heat to the sanitary water through the fins and partitions, so that the water temperature can quickly meet the use requirements.

As shown in Figures 2, 3, 4, 5, 6 and 7, the plate-fin heat exchanger includes a core 6, a head 7, an inlet connection 8 and an outlet connection 9. The core body 6 is composed of a plurality of flue gas channels and sanitary water channels that are alternately connected by partitions 10 in a rectangular cavity; the alternately connected multiple flue gas channels and sanitary water channels refer to the sanitary The water channel, and the flue gas channel on both sides of the sanitary water channel. The flue gas channel is provided with flue gas side fins 11 between the two metal partitions 10, the flue gas side fins 11 are arranged longitudinally, and the left and right sides of the flue gas side fins 11 are sealed by seals 12, forming a channel that can make the flue gas longitudinally circulation channel. The sanitary water channel is provided with water side fins 13 between the two metal partitions 10, the water side fins 13 are arranged horizontally, the upper and lower sides of the water side fins 13 are sealed by seals 12, and the left and right ends are respectively connected with the two heads 7 , forming a channel that can make the sanitary water flow laterally; the sealing heads 7 on both sides are respectively connected with the sanitary water inlet connecting pipe 8 and the outlet connecting pipe 9. Both the flue gas side fins 11 and the water side fins 13 are continuous groove structures. A continuous groove structure means that multiple groove structures are connected together, and the opening directions of the grooves of two adjacent groove structures are opposite. The flue gas side fins 11 and water side fins 13 evenly arranged in the sanitary water channel and the flue gas channel run through the entire sanitary water channel and the flue gas channel, and the flue gas side fins 11 and the flue gas side fins in the sanitary water channel and the flue gas channel The direction of the water-side fins 13 is consistent, and the directions of the adjacent smoke-side fins 11 and water-side fins 13 are perpendicular to each other. Welded on the partition 10 by vacuum brazing; the head 7 set on both sides of the sanitary water channel, the inlet connection 8, the outlet connection 9, the partition 10, the flue gas side fin 11, the seal 12 and the water side fin 13, etc. All are made of stainless steel. Wherein the separator 10 is preferably a 0.6mm stainless steel sheet, and the surface of the separator 10 is covered with 0.1mm thick pure copper foil solder for welding the flue gas side fin 11 and the water side fin 13; the seal 12 is preferably 2mm The stainless steel thin plate, the flue gas side fins 11 and the water side fins 13 are preferably 0.2 mm thick stainless steel fins.

In the core body 6, the water in the sanitary water channel enters through the inlet connecting pipe 8, which is cold water, flows into a plurality of sanitary water channels through the head 7, and the water flows laterally in the water side fins 13 in the sanitary water channel; The flue gas enters the flue gas flow channel from the bottom surface of the heat exchanger core 6, and flows longitudinally in the flue gas side fins 11 in the flue gas channel. Since a plurality of sanitary water channels and flue gas channels are arranged alternately in the core body 6 The flue gas flowing vertically and the water flowing horizontally exchange heat through the separator, the flue gas side fins 11 and the water side fins 13, forming a cross-flow heat exchange system. The high-temperature flue gas transfers heat to the sanitary water, and the incoming cold water absorbs heat and becomes hot water, flows into the sealing head 7 and then flows out through the outlet connecting pipe 9.

In the patent of this invention, the stainless steel plate-fin heat exchanger is used as the gas-water heat exchanger of the gas water heater. Due to its highly compact plate-fin structure, under the same heat exchange intensity, the heat exchanger consumes less material and the space volume Smaller, and its primary heat exchange area is larger than that of the existing finned tube structure, so its thermal resistance is relatively small, and its heat transfer efficiency is high; the stainless steel plate-fin heat exchanger in the patent of this invention is made of regular It is composed of structural parts, so its manufacturing process does not need to use twisting and other processes, and it can use stainless steel materials with poor ductility for overall brazing welding, easy processing, continuous mass production, and a significant reduction in manufacturing costs compared with existing technologies; The flue gas side fins of the stainless steel plate-fin heat exchanger in the patent of the present invention adopt a continuous groove structure, and its flow channel resistance is small, which has little influence on the combustion conditions of the combustion chamber. In addition, because its manufacturing materials are all made of stainless steel, its It has outstanding performance in high temperature resistance, pressure resistance, and corrosion resistance; the sanitary water channel of the plate-fin heat exchanger in the patent of the present invention is a multi-stream narrow and long channel and uses fins, which can also make the fluid between the plates under the condition of low Reynolds number It is in a turbulent state, thereby enhancing the heat exchange effect on the water side and improving the heat exchange efficiency of the heat exchanger.

Claims (3)

1. a plate-fin heat exchanger that is used for gas heater comprises core body, end socket, entrance sleeve and discharge connection, it is characterized in that: core body is formed by being separated into a plurality of exhaust gases passes and the sanitary water passage that alternately connect by dividing plate in the rectangular enclosure; Described a plurality of exhaust gases passes and the sanitary water passage that alternately connects is meant that the exhaust gases passes both sides are respectively the sanitary water passage, and sanitary water passage both sides are respectively exhaust gases passes; Exhaust gases passes is that the fume side fin is set between two metal partion (metp)s, and the fume side fin arranges that vertically the fume side fin left and right sides seals by strip of paper used for sealing; The sanitary water passage is that water side fin is set between two metal partion (metp)s, water side fin lateral arrangement, and water side fin seals by strip of paper used for sealing both sides up and down, and two ends, the left and right sides are communicated with two end sockets respectively; The end socket of both sides links to each other with sanitary water entrance sleeve and discharge connection respectively; Described fume side fin and water side fin all are continuous bathtub construction, and continuous bathtub construction is meant that a plurality of bathtub constructions link together, and the opening direction of the groove of adjacent two bathtub constructions is opposite.

2. the plate-fin heat exchanger that is used for gas heater according to claim 1 is characterized in that: described end socket, and entrance sleeve, discharge connection, dividing plate, the fume side fin, strip of paper used for sealing and water side fin are by the stainless steel material manufacturing.

3. the plate-fin heat exchanger that is used for gas heater according to claim 1 is characterized in that: described fume side fin and water side fin are welded on the dividing plate by vacuum brazing.

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