Miniaturized efficient condensation heat exchanger

Abstract

The utility model discloses a miniaturized efficient condensing heat exchanger which is characterized in that the miniaturized efficient condensing heat exchanger comprises a shell, a flue gas guide plate, heat transfer tube fixing plates on two sides and a plurality of heat transfer tubes, the flue gas guide plate, the heat transfer tube fixing plates and the heat transfer tubes are arranged in the shell, a flue gas inlet and a flue gas outlet are arranged on the shell, and the flue gas inlet is perpendicular to the flue gas outlet. Miniaturization design of the water heater is facilitated; the heat transfer pipes are fixed to the heat transfer pipe fixing plate side by side or in a staggered arrangement mode, a cover plate is arranged outside the heat transfer pipe fixing plate, water collecting cavities protruding outwards, a water inlet and a water outlet are formed in the cover plate, and the heat transfer pipes are communicated through each water collecting cavity to form a corresponding water flow channel. Water flow resistance can be reduced through the water flow channels formed by the heat transfer pipes connected in parallel, the heat exchange area is increased, the heat exchange efficiency is improved, the water flow channels are connected in series through the water collecting cavities located in the cover plate, and the water inlet and the water outlet are communicated. The utility model has the advantages of good stability, small volume, higher efficiency and better performance consistency.

Description

Technical Field

[0001] The utility model relates to the technical field of electric water heaters, and more specifically to a condensing heat exchanger. Background Art

[0002] In order to realize the flue gas waste heat recovery, the gas water heater usually adopts the method of setting up a secondary condensing heat exchanger. The existing condensing gas water heater adopts a bellows winding structure, which is large in size, poor in structural consistency, and insufficient in flue gas utilization. For example, the Chinese patent authorization announcement number is CN204648683U, which discloses a double-duct multi-way bypass condensing heat exchanger for absorbing the latent heat of high-temperature flue gas, which is suitable for gas water heaters or dual-purpose furnaces, especially for blast-type gas water heaters. A double-duct multi-way bypass condensing heat exchanger, characterized in that it includes a smoke box and a heat exchanger, the smoke box is provided with a smoke guide area, the smoke box is provided with a condensate collection box and a smoke guide plate, the condensate collection box and the smoke guide plate divide the smoke guide area into two mirror-symmetrical smoke channels, and the heat exchanger is provided with a heat exchange tube group, and the heat exchange tube group is respectively arranged in two smoke channels. This patent structure adopts a multi-way bypass condensing heat exchange structure and a double duct structure to prevent smoke accumulation and suppress local overheating. But the disadvantage is that the volume is large, which is not suitable for the development trend of gas water heaters becoming smaller and smaller and heat exchange efficiency becoming higher and higher. For this reason, it is necessary to further improve the prior art. Summary of the invention

[0003] The purpose of the utility model is to solve the deficiencies of the prior art and to provide a small and efficient condensing heat exchanger which is stable and reliable, has a volume reduced by more than 30% compared with the existing heat exchanger, has higher efficiency and better performance consistency.

[0004] The utility model adopts the following technical solutions to achieve the above-mentioned purpose: a miniaturized high-efficiency condensing heat exchanger, characterized in that it includes an outer shell and a smoke guide plate arranged therein, heat transfer tube fixing plates on both sides, and multiple heat transfer tubes. The outer shell is provided with a smoke inlet and a smoke outlet, and the smoke inlet and the smoke outlet are at a vertical angle, which is convenient for saving installation volume and is conducive to the miniaturization design of the water heater; the heat transfer tubes are fixed to the heat transfer tube fixing plate in a side-by-side or staggered arrangement, and a cover plate is arranged outside the heat transfer tube fixing plate. The cover plate is provided with a water collecting cavity protruding outward, a water inlet and a water outlet, each water collecting cavity connects a plurality of heat transfer tubes to form a corresponding water flow channel, and the water flow channel composed of multiple parallel heat transfer tubes can reduce water flow resistance, improve heat exchange area and heat exchange efficiency, and several water collecting cavities located on the cover plate connect each water flow channel in series and connect the water inlet with the water outlet.

[0005] As a further explanation of the above scheme, the smoke guide plate is installed at the smoke inlet. The smoke guide plate is provided with an inclined portion on the side closest to the smoke inlet and the smoke outlet, in order to guide the high-temperature smoke away from the outlet, increase the residence time of the smoke, and avoid direct discharge; a vertical portion is provided below the inclined portion, and a plurality of small holes are provided on the vertical portion, in order to allow part of the high-temperature smoke to first pass through the small holes to exchange heat with the heat transfer tube, while reducing the smoke resistance.

[0006] Furthermore, the vertical portion is bent to the right at the middle position of the heat transfer tube corresponding to the heat transfer tube, and a number of small holes are provided on the horizontal portion, allowing part of the flue gas to pass through and exchange heat with the heat transfer tube. In order to facilitate the discharge of condensed water, the horizontal portion can be slightly tilted downward by 0-10 degrees; the horizontal portion divides the heat transfer tube area into two parts, the upper and lower parts, and its length extends to the right to the middle position of the heat transfer tube area. A gap greater than 30 mm is reserved on the right to facilitate the flow of flue gas.

[0007] Further, the smoke inlet is arranged at the side of the shell, and the smoke outlet is located at the top of the shell.

[0008] Furthermore, the heat transfer tube fixing plates on both sides are distributed front and back, and the outside of the heat transfer tube fixing plate on the front side corresponds to the front cover plate; and the outside of the heat transfer tube fixing plate on the rear side corresponds to the rear cover plate.

[0009] Furthermore, the water inlet is located near the smoke outlet side, and the water outlet is located near the smoke inlet side. The water flow and the smoke flow in opposite directions, which can increase the heat exchange temperature difference and improve the heat exchange efficiency.

[0010] Furthermore, the heat transfer tube is a round tube with a diameter of 5-10 mm, or may be an elliptical tube, or a fin tube or a corrugated tube, and the distance between the heat transfer tubes is 8-16 mm.

[0011] Furthermore, a condensed water discharge port is provided at the bottom of the shell for discharging condensed water generated during the heat exchange process of the heat transfer tube.

[0012] The beneficial effects that can be achieved by the utility model by adopting the above technical solution are:

[0013] The utility model adopts a condensing heat exchanger shell which is mainly composed of a front cover plate, a rear cover plate and a side plate. A smoke inlet and a smoke outlet are arranged on the shell. The smoke inlet and the smoke outlet are at a vertical angle, which is convenient for saving installation volume and is conducive to the miniaturized design of the water heater. In order to further improve the heat exchange efficiency of the miniaturized condensing heat exchanger, a smoke guide plate is installed at the smoke inlet. The smoke guide plate is provided with an inclined portion on the side closest to the smoke inlet and the outlet, in order to guide the high-temperature smoke away from the outlet, increase the residence time of the smoke, and avoid direct discharge. A vertical section is provided with a number of small holes, the purpose of which is to allow part of the high-temperature flue gas to first pass through the small holes to exchange heat with the heat transfer tube, while reducing the flue gas resistance; the vertical section is bent to the right corresponding to the middle position of the heat transfer tube to form a horizontal section, and a number of small holes are provided on the horizontal section, allowing part of the flue gas to pass through and exchange heat with the heat transfer tube; the horizontal section divides the heat transfer tube area into two parts, the length of which extends to the right to the middle position of the heat transfer tube area, and a gap of more than 30mm is reserved on the right to facilitate the flow of flue gas, so that the heat of the high-temperature flue gas can be fully utilized, the heat transfer tube is heated evenly, and the performance consistency is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the exploded structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0016] Figure 3 Schematic diagram of the smoke guide plate structure.

[0017] Figure 4 Schematic diagram of smoke flow direction.

[0018] Figure 5 Schematic diagram of flue gas temperature distribution.

[0019] Figure 6 Schematic diagram of water flow direction.

[0020] Explanation of the accompanying drawings: 1, outer shell 1-1, front cover plate 1-2, rear cover plate 1-3, side plate 1-4, smoke inlet 1-5, smoke outlet 2, smoke guide plate 2-1, inclined portion 2-2, vertical portion 2-3, horizontal portion 3, heat transfer tube fixing plate 4, multiple heat transfer tubes 5, rear cover plate 6, front cover plate 6-1, water collecting chamber 6-2, water inlet 6-3, water outlet 7, condensate discharge port. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, "at least" means one or more, unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise specified and limited, the terms "assembly", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the utility model, unless otherwise specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "below" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the height of the second feature. A first feature being "above", "below" and "below" a second feature includes that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the second feature.

[0025] The following is a further description of the specific implementation of the utility model in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the utility model are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the utility model, and cannot be understood as limiting the utility model.

[0026] like Figure 1-Figure 6As shown, the utility model is a miniaturized high-efficiency condensing heat exchanger, including a shell 1 and a smoke guide plate 2 arranged therein, heat transfer tube fixing plates 3 on both sides, and multiple heat transfer tubes 4. The shell 1 is composed of a front cover plate 1-1, a rear cover plate 1-2, and a side plate 1-3. The shell 1 is provided with a smoke inlet 1-4 and a smoke outlet 1-5, and the smoke inlet and the smoke outlet are at a vertical angle, which is convenient for saving installation volume and is conducive to the miniaturization design of the water heater; the heat transfer tubes 4 are fixed to the heat transfer tube fixing plate 3 in a side-by-side or staggered arrangement, a rear cover plate 5 is arranged outside the heat transfer tube fixing plate on the rear side, and a front cover plate 6 is arranged outside the heat transfer tube fixing plate on the front side, and the front cover plate 6 is provided with an outwardly protruding water collecting cavity 6-1, a water inlet 6-2 and a water outlet 6-3; each water collecting cavity connects a plurality of heat transfer tubes to form a corresponding water flow channel, and the water flow channel composed of multiple parallel heat transfer tubes 4 can reduce water flow resistance, increase heat exchange area and heat exchange efficiency, and several water collecting cavities located on the front cover plate 6 and the rear cover plate 5 connect each water flow channel in series and connect the water inlet with the water outlet.

[0027] The heat transfer tube 4 is made of stainless steel or other corrosion-resistant materials with good thermal conductivity. The heat transfer tube 4 is a round tube with a diameter between 5-10 mm, or an elliptical tube, or a fin tube and a corrugated tube. The distance between the heat transfer tubes is 8-16 mm. The heat transfer tubes are fixed to the heat transfer tube fixing plate in a side-by-side or staggered arrangement.

[0028] In this embodiment, there are 4 water flow channels, each of which is composed of several parallel heat transfer tubes. Figure 5 As shown, numbers 1-4 represent the water flow order, which is divided into 4 areas. The water inlet is located near the flue gas outlet, and the water outlet is located near the flue gas inlet. The water flow and the flue gas are in reverse flow directions, which can increase the heat exchange temperature difference and improve the heat exchange efficiency.

[0029] Since the flue gas inlet and the flue gas outlet are at a vertical angle, the flue gas flows in a non-linear direction in the condensing heat exchanger, which can easily lead to uneven heating of each heat transfer tube and reduce the heat transfer efficiency. In order to further improve the heat exchange efficiency of the miniaturized condensing heat exchanger, a flue gas guide plate 2 is installed at the flue gas inlet. The flue gas guide plate 2 is provided with an inclined portion 2-1 on the side closest to the flue gas inlet and outlet, in order to guide the high-temperature flue gas away from the outlet, increase the residence time of the flue gas, and avoid direct discharge. A vertical portion 2-2 is provided below the inclined portion, and a plurality of small holes are provided on the vertical portion, in order to allow part of the high-temperature flue gas to first pass through the small holes to exchange heat with the heat transfer pipe in area 4, while reducing the flue gas resistance; the vertical portion 2-2 is bent to the right at the middle position of the heat transfer pipe corresponding to the heat transfer pipe to form a horizontal portion 2-3, and a plurality of small holes are provided on the horizontal portion, so that part of the flue gas can pass through and exchange heat with the heat transfer pipe. In order to facilitate the discharge of condensed water, the horizontal portion can be slightly tilted downward by 0-10 degrees; the horizontal portion divides the heat transfer pipe area into upper and lower parts, and its length extends to the right to the middle position of the heat transfer pipe area, and a gap greater than 30 mm is reserved on the right to facilitate the flow of flue gas. This structure can divide the high-temperature flue gas into two parts. A small part of the flue gas with a shorter flow path is discharged after heat exchange with the heat transfer tube through area 4, and most of the flue gas is discharged through area 1-area 2-area 3, so that the heat of the high-temperature flue gas can be fully utilized and the heat transfer tube is heated evenly.

[0030] A condensed water discharge port 7 is provided at the bottom of the shell for discharging condensed water generated during the heat exchange process of the heat transfer tube.

[0031] Compared with the prior art, the utility model adopts a condensing heat exchanger shell which is mainly composed of a front cover plate, a rear cover plate and side plates. A smoke inlet and a smoke outlet are provided on the shell. The smoke inlet and the smoke outlet are at a vertical angle, which is convenient for saving installation volume and is conducive to the miniaturized design of the water heater. In order to further improve the heat exchange efficiency of the miniaturized condensing heat exchanger, a smoke guide plate is installed at the smoke inlet, so that the heat of the high-temperature smoke can be fully utilized, the heat transfer tube is heated evenly, and the performance consistency is better. The volume of the condensing heat exchanger is reduced by more than 30% compared with the existing heat exchanger.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A miniaturized high-efficiency condensing heat exchanger, characterized in that: It comprises an outer shell and a smoke guide plate arranged therein, heat transfer tube fixing plates on both sides, and a plurality of heat transfer tubes. The outer shell is provided with a smoke inlet and a smoke outlet, and the smoke inlet and the smoke outlet are at a vertical angle. The heat transfer tubes are fixed to the heat transfer tube fixing plate in a side-by-side or staggered arrangement. A cover plate is arranged outside the heat transfer tube fixing plate, and a water collecting cavity protruding outward, a water inlet and a water outlet are provided on the cover plate. Each water collecting cavity connects a plurality of heat transfer tubes to form a corresponding water flow channel. The plurality of water collecting cavities located on the cover plate connect each water flow channel in series and connect the water inlet with the water outlet.

2. A miniaturized high-efficiency condensing heat exchanger according to claim 1, characterized in that: The smoke guide plate is installed at the smoke inlet, and is provided with an inclined portion on the side closest to the smoke inlet and the smoke outlet; a vertical portion is provided below the inclined portion, and a plurality of small holes are provided on the vertical portion.

3. A miniaturized high-efficiency condensing heat exchanger according to claim 1, characterized in that: The vertical part is bent to the right at the middle of the heat transfer tube to form a horizontal part, on which a number of small holes are arranged; the horizontal part divides the heat transfer tube area into two parts, the length of which extends to the right to the middle of the heat transfer tube area, and a gap of more than 30 mm is reserved on the right.

4. A miniaturized high-efficiency condensing heat exchanger according to claim 1, characterized in that: The smoke inlet is arranged at the side of the housing, and the smoke outlet is located at the top of the housing.

5. A miniaturized high-efficiency condensing heat exchanger according to claim 1, characterized in that: The heat transfer tube fixing plates on both sides are distributed front and back, and the front cover plate corresponds to the outside of the heat transfer tube fixing plate on the front side, and the rear cover plate corresponds to the outside of the heat transfer tube fixing plate on the rear side.

6. A miniaturized high-efficiency condensing heat exchanger according to claim 1, characterized in that: The water inlet is located near the smoke outlet, the water outlet is located near the smoke inlet, and the water flow and the smoke flow in opposite directions.

7. A miniaturized high-efficiency condensing heat exchanger according to claim 1, characterized in that: The heat transfer tube is a round tube with a diameter of 5-10 mm, or an elliptical tube, or a fin tube, or a corrugated tube, and the distance between the heat transfer tubes is 8-16 mm.

8. The miniaturized high-efficiency condensing heat exchanger according to claim 1, characterized in that: A condensed water discharge port is arranged at the bottom of the housing.

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