CN221959045U - Heat exchanger and gas water heater comprising same - Google Patents

Abstract

The utility model discloses a heat exchanger and a gas water heater comprising the same, wherein a heat exchange tube is arranged on the heat exchanger, a heat exchange plate is arranged on the heat exchange tube, a first end and a second end which are opposite are arranged on the heat exchange plate, and the first end is positioned at the downstream of the second end in the fluid flow direction; the heat exchange plate is provided with heat exchange tube holes, the heat exchange tubes penetrate through the heat exchange tube holes, the heat exchange plate is provided with a first runner and a second runner which are communicated with the first end and the second end, and the first runner and the second runner are positioned on two sides of the heat exchange tube holes and are intersected at the first end. When the heat exchanger and the gas water heater comprising the same are in operation, fluid to be heat-exchanged flows from the second end of the heat exchange plate to the first end, flows into the first flow channel and the second flow channel respectively, and flows out of the heat exchange plate after flowing around the heat exchange tube in a half-cycle mode at the first end, so that each part of the heat exchange tube is fully heated, the flow path of the fluid in the heat exchange plate is prolonged, the flow resistance of the fluid is increased, and the residence time of the fluid at the heat exchange plate is longer so as to fully exchange heat.

Description

Heat exchanger and gas water heater containing the same

Technical Field

The utility model relates to a heat exchanger and a gas water heater comprising the heat exchanger.

Background Art

With the development demand of energy conservation and emission reduction, gas heating is gradually moving towards improving energy efficiency, which mainly relies on improving the energy utilization efficiency in the heat exchange process.

In the prior art, high-temperature flue gas often exchanges heat in the heat exchanger directly or only after passing through a simple turbulence structure such as a boss, and mostly flows through the heat exchanger in a straight line. The contact time with the container containing the working medium to be heated is short, and the heat exchange efficiency is not high. In addition, the high-temperature flue gas is discharged after only one heat exchange in the heat exchanger, and a large amount of heat is not used for heat exchange but is discharged and wasted, which also leads to insufficient energy utilization efficiency.

Utility Model Content

The technical problem to be solved by the utility model is to overcome the defects of the prior art such as short high-temperature flue gas contact time, insufficient heat exchange, and low energy utilization efficiency in the heat exchanger, and to provide a heat exchanger and a gas water heater containing the same.

The utility model solves the above technical problems through the following technical solutions:

The utility model provides a heat exchanger, wherein a heat exchange tube is installed on the heat exchanger, a heat exchange plate is installed on the heat exchange tube, and a first end and a second end opposite to each other are provided on the heat exchange plate, wherein the first end is located downstream of the second end in the fluid flow direction;

The heat exchange plate is provided with a heat exchange tube hole, and the heat exchange tube passes through the heat exchange tube hole. The heat exchange plate is provided with a first flow channel and a second flow channel connecting the first end and the second end. The first flow channel and the second flow channel are located on both sides of the heat exchange tube hole and intersect at the first end.

In the present technical solution, when the heat exchanger is working, the fluid to be exchanged flows from the second end of the heat exchange plate to the first end, and is divided into two streams at the second end, flowing into the first flow channel and the second flow channel respectively, and then merges at the first end and flows out of the heat exchange plate after circling the heat exchange tube half a circle, so that all parts of the heat exchange tube are fully heated, and at the same time, the flow path of the fluid in the heat exchange plate is extended, the flow resistance of the fluid is increased, and the fluid stays at the heat exchange plate for a longer time, so that the heat exchange is more fully performed.

Preferably, the heat exchange plate also includes a first side and a second side relative to each other, the first side and the second side are respectively connected to the first end and the second end on both sides of the heat exchange tube hole, the edges of the first side and the second side are provided with a first flange folded to the same side, the first flange of the first side cooperates with the heat exchange tube to form the first flow channel, and the first flange of the second side cooperates with the heat exchange tube to form the second flow channel.

In the present technical solution, the first flanges of the first side and the second side limit the edges of the first flow channel and the second flow channel, guide the fluid, and further restrict the fluid to flow in the flow channel to prevent escape from affecting the heat exchange efficiency. At the same time, it also further increases the flow resistance of the fluid and prolongs the fluid flow time to promote heat exchange.

Preferably, the edge of the heat exchange tube hole is provided with a second flange, the second flange has the same folding direction as the first flange, and a guide portion is formed on the second flange at the intersection of the first flow channel and the second flow channel, the guide portion protrudes toward the first end, and the two sides of the guide portion are relatively recessed.

In the present technical solution, the second flange forms a guide portion to guide the fluid in the first flow channel and the second flow channel to flow toward the first end to flow out of the heat exchange plate, and at the same time separate the first flow channel and the second flow channel so that the two fluids flow out of the heat exchange plate separately, avoiding convection of the two fluids at the first end, which causes the flue gas and other fluids to gather at the first end and flow out poorly.

Preferably, the guide portion tapers from an end away from the first end to an end close to the first end.

In the present technical solution, the guide portion gradually shrinks toward the first end, guiding the fluid in the first flow channel and the second flow channel to be relatively concentrated when flowing to the first end, thereby preventing the fluid from escaping when flowing out of the heat exchange plate, facilitating subsequent collection and utilization.

Preferably, at least two heat exchange tube holes are provided between the first side and the second side, and a V-shaped flange with an opening toward the outside of the heat exchange plate is provided between the two heat exchange tube holes at the first end, and the fluid between two adjacent heat exchange tube holes is connected, and the two side edges of the V-shaped flange form flow channels with the heat exchange tube on the corresponding side respectively.

In the present technical solution, two side-by-side heat exchange tube holes are provided on the heat exchange plate. The fluid entering the heat exchange plate surrounds the two heat exchange tubes for half a circle and then flows out of the heat exchange plate, and the fluid parts surrounding the two heat exchange tubes are mixed, so that each heat exchange plate can exchange heat with more than one heat exchange tube, thereby improving the heat exchange effect and saving equipment costs.

Preferably, the heat exchanger also includes a shell, which is provided with a smoke outlet and a smoke inlet, the smoke outlet and the smoke inlet are located on the same side of the shell, and a partition is provided in the shell, the partition divides the shell into a first chamber and a second chamber that are connected, the first chamber is connected to the smoke inlet, the second chamber is connected to the smoke outlet, and the first chamber and the second chamber are connected on a side away from the smoke outlet and the smoke inlet.

In this technical solution, the fluid flows into the first chamber from the smoke inlet, then flows into the second chamber from the far end of the smoke inlet and outlet, and flows out of the heat exchanger from the smoke outlet, thereby greatly extending the flow path of the fluid in the heat exchanger, and its heat is fully absorbed by the heat exchange tube.

Preferably, a fluid flow path between the flue gas outlet and the flue gas inlet intersects with an axis of the heat exchange tube.

In the present technical solution, the flow direction of the flue gas in the heat exchanger intersects with the heat exchange tubes instead of being parallel, thereby enhancing the turbulence effect on the flue gas and achieving sufficient heat exchange between the flue gas and the heat exchange tubes.

Preferably, the heat exchange fins are stainless steel heat exchange fins.

In this technical solution, the heat exchange plate is made of stainless steel, which has low cost and good thermal conductivity.

The utility model also provides a gas water heater, comprising the heat exchanger as described in any one of the above items.

In this technical solution, the high-temperature flue gas generated by combustion in the gas water heater fully exchanges heat with the cold water entering the gas water heater, thereby improving the thermal efficiency.

Preferably, the gas water heater further comprises a primary heat exchanger, the smoke exhaust port of the primary heat exchanger is connected to the smoke inlet of the heat exchanger via a pipeline, and the water inlet of the primary heat exchanger is connected to the water outlet of the heat exchange tube.

In this technical solution, the heat exchanger acts as a secondary heat exchanger. The high-temperature flue gas in the primary heat exchanger flows into the heat exchanger, and is preheated and then discharged after entering the cold water of the primary heat exchanger. The preheated cold water flows into the primary heat exchanger through a pipeline and is heated by the heat generated by the combustion of gas for use by users. This not only recovers the waste heat of the high-temperature flue gas, but also increases the inlet water temperature of the primary heat exchanger, thereby improving the overall thermal efficiency of the primary heat exchanger and the gas water heater.

On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

The positive and progressive effects of the utility model are:

The heat exchanger of the utility model and the gas water heater including the same, when the heat exchanger is working, the fluid to be heat exchanged flows from the second end of the heat exchange plate to the first end, and is divided into two streams at the second end, which flow into the first flow channel and the second flow channel respectively, and then merge at the first end and flow out of the heat exchange plate after circling the heat exchange tube half a circle, so that all parts of the heat exchange tube are fully heated, and at the same time, the flow path of the fluid in the heat exchange plate is extended, the flow resistance of the fluid is increased, and the fluid stays at the heat exchange plate for a longer time, and heat exchange is more fully performed, which has better practicality.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a three-dimensional schematic diagram of a heat exchange plate in a heat exchanger of the present invention.

FIG. 2 is a schematic diagram of the fluid flow path of the heat exchange plate in the heat exchanger of the present invention.

FIG3 is a side schematic diagram of the heat exchanger of the present invention.

FIG. 4 is a schematic diagram of the fluid flow path of the heat exchanger of the present invention.

FIG5 is an exploded schematic diagram of the heat exchanger of the present invention.

FIG6 is a partial enlarged schematic diagram of point A of the heat exchanger of the present invention.

Description of reference numerals:

Heat exchange plate 1, heat exchange tube hole 11, first flow channel 12, second flow channel 13, first end 14, second end 15, first side 16, second side 17;

Heat exchange tube 2;

First flange 3;

Shell 4, smoke outlet 401, smoke inlet 402, partition 403, first chamber 404, second chamber 405, drain outlet 406, drain outlet joint 407, bottom plate 408, bottom cover 409, top plate 410, top shell 411, heat exchange tube inlet 412, heat exchange tube outlet 413;

The second flange 5, the guide portion 51;

V-shaped flange 6.

DETAILED DESCRIPTION

The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

As shown in Figures 1 to 6, they are reference schematic diagrams of embodiments of the heat exchanger and the gas water heater including the heat exchanger of the utility model. The heat exchanger is installed with a heat exchange tube 2, and a heat exchange plate 1 is installed on the heat exchange tube 2. The heat exchange plate 1 is provided with a first end 14 and a second end 15 opposite to each other, and the first end 14 is located downstream of the second end 15 in the fluid flow direction; the heat exchange plate 1 is provided with a heat exchange tube hole 11, and the heat exchange tube 2 passes through the heat exchange tube hole 11. The heat exchange plate 1 is provided with a first flow channel 12 and a second flow channel 13 connecting the first end 14 and the second end 15, and the first flow channel 12 and the second flow channel 13 are located on both sides of the heat exchange tube hole 11 and meet at the first end 14. As shown in FIG. 2 , when the heat exchanger is working, the fluid to be exchanged flows from the second end 15 of the heat exchange plate 1 to the first end 14, and is divided into two streams at the second end 15, flowing into the first flow channel 12 and the second flow channel 13 respectively, and then merges at the first end 14 and flows out of the heat exchange plate 1 after circling the heat exchange tube 2 for half a circle, so that all parts of the heat exchange tube 2 are fully heated, and at the same time, the flow path of the fluid in the heat exchange plate 1 is extended, the flow resistance of the fluid is increased, and the fluid stays at the heat exchange plate 1 for a longer time, so that the heat exchange is more fully performed.

The heat exchange plate 1 also includes a first side 16 and a second side 17 opposite to each other. The first side 16 and the second side 17 are connected to the first end 14 and the second end 15 on both sides of the heat exchange tube hole 11, respectively. The first flange 3 folded toward the same side is provided at the edge of the first side 16 and the second side 17 near the first end 14. The first flange 3 of the first side 16 cooperates with the heat exchange tube 2 to form the first flow channel 12, and the first flange 3 of the second side 17 cooperates with the heat exchange tube 2 to form the second flow channel 13. The first flange 3 of the first side 16 and the second side 17 limits the edges of the first flow channel 12 and the second flow channel 13, guides the fluid, and further limits the fluid to flow in the flow channel to prevent the escape from affecting the heat exchange efficiency. At the same time, the flow resistance of the fluid is further increased, and the fluid flow time is extended to promote heat exchange.

In other embodiments, the edges of the first side 16 and the second side 17 may also be completely provided with the first flange 3 .

In this embodiment, the edge of the heat exchange tube hole 11 is surrounded by a second flange 5, and the second flange 5 of the heat exchange tube hole 11 has the same folding direction as the first flange 3. A guide portion 51 is formed on the second flange 5 at the intersection of the first flow channel 12 and the second flow channel 13. The guide portion 51 protrudes toward the first end 14, and the two sides of the guide portion 51 are relatively concave, and protrude in an arc toward the heat exchange tube 2. The second flange 5 forms the guide portion 51, which guides the fluid in the first flow channel 12 and the second flow channel 13 to flow toward the first end 14 to flow out of the heat exchange plate 1, and at the same time separates the first flow channel 12 and the second flow channel 13, so that the two fluids flow out of the heat exchange plate 1 separately, avoiding convection between the two fluids at the first end 14, resulting in the accumulation of flue gas and other fluids at the first end 14 and poor outflow.

In other embodiments, only a portion of the edge of the heat exchange tube hole 11 may be provided with the second flange 5 .

In this embodiment, the guide portion 51 tapers from an end away from the first end 14 to an end close to the first end 14. The guide portion 51 tapers toward the first end 14, guiding the fluid in the first flow channel 12 and the second flow channel 13 to be relatively concentrated when flowing to the first end 14, thereby preventing the fluid from escaping when flowing out of the heat exchange plate 1, and facilitating subsequent collection and utilization.

Four heat exchange tube holes 11 are arranged in two rows between the first side 16 and the second side 17, with two heat exchange tube holes 11 in each row, and the heat exchange tube holes 11 in each row are aligned in the flow direction of the fluid. A V-shaped flange 6 (composed of two adjacent first flanges 3) with an opening toward the outside of the heat exchange plate 1 is arranged between the two heat exchange tube holes 11 at the first end 14, and the fluid between the two adjacent heat exchange tube holes 11 is connected, and the two side edges of the V-shaped flange 6 form flow channels with the heat exchange tube 2 on the corresponding side. Two side-by-side heat exchange tube holes 11 are arranged on the heat exchange plate 1, and the fluid entering the heat exchange plate 1 surrounds the two heat exchange tubes 2 for half a circle and then flows out of the heat exchange plate 1, and the fluid parts surrounding the two heat exchange tubes 2 are mixed, so that each heat exchange plate 1 can exchange heat with more than one heat exchange tube 2, thereby improving the heat exchange effect and saving equipment costs.

In other embodiments, the heat exchange plate 1 may be provided with more than two heat exchange tube holes 11 in the horizontal direction, or multiple rows of heat exchange tube holes 11 may be provided in the flow direction of the fluid, and the heat exchange tube holes 11 in each row are aligned in the flow direction of the fluid.

As shown in Fig. 3 to Fig. 6, in this embodiment, the heat exchanger further comprises a shell 4, on which a smoke outlet 401 and a smoke inlet 402 are provided, the smoke outlet 401 and the smoke inlet 402 are located on the same side of the shell 4, a partition 403 is provided in the shell 4, the partition 403 divides the shell 4 into a first chamber 404 and a second chamber 405 which are connected, the first chamber 404 is connected to the smoke inlet 402, the second chamber 405 is connected to the smoke outlet 401, a gap is left between the partition 403 and the shell 4 on the side away from the smoke outlet 401 and the smoke inlet 402, and the first chamber 404 and the second chamber 405 are connected through the gap between the partition 403 and the shell 4. The fluid flows into the first chamber 404 from the smoke inlet 402, then flows into the second chamber 405 from the far end of the smoke inlet and outlet, and flows out of the heat exchanger from the smoke outlet 401, thereby greatly extending the flow path of the fluid in the heat exchanger, and its heat is fully absorbed by the heat exchange tube 2.

The fluid flow path between the smoke outlet 401 and the smoke inlet 402 intersects with the axis of the heat exchange tube 2. The flow direction of the smoke in the heat exchanger intersects with the heat exchange tube 2 instead of being parallel, which enhances the turbulence effect on the smoke and enables sufficient heat exchange between the smoke and the heat exchange tube 2.

The heat exchanger fin 1 is a stainless steel heat exchanger fin, which has low cost and good thermal conductivity.

A drain port 406 is provided at the bottom of the shell 4, and a drain port joint 407 connected to the drain port 406 is provided inside the shell 4. The shell 4 and the drain port joint 7 are made of plastic. The water vapor in the flue gas flowing in the shell 4 condenses into water droplets during the heat exchange process, and gradually gathers at the lowest point of the shell 4 and flows into the drain port joint 407, and is discharged from the drain port 406, so as to avoid the accumulation of condensed water causing corrosion of the stainless steel parts in the shell 4 and the decrease of heat exchange efficiency; the shell 4 and the drain port joint 7 made of plastic are in contact with the condensed water that may dissolve acidic gas, so as to avoid being corroded.

Four heat exchange tubes 2 are arranged in the shell 4, and a plurality of heat exchange plates 1 are sleeved on the heat exchange tubes 2. The arrangement of a plurality of heat exchange tubes 2 reduces the influence of the whole machine tube loss on the flow rate, makes the circulating water flow rate larger, and heats faster.

In other embodiments, other numbers of multiple heat exchange tubes 2 may be provided, and the specific number of heat exchange tubes 2 may be provided according to the size and design requirements of the shell 4. In this embodiment, one end of the heat exchange tube 2 passes through and is fixed on the bottom plate 408 and the bottom cover 409, and the other end passes through and is fixed on the top plate 410 and the top cover 411, and the bottom plate 408 and the top plate 409 are located in the shell 4; the bottom cover 409 is provided on the outside of the bottom plate 408, and the top cover 411 is provided on the outside of the top plate 409, and the bottom cover 409 and the top cover 411 are fixed on the shell 4, and the top cover 411 is provided with a heat exchange tube inlet 412 and a heat exchange tube outlet 413; the heat exchange plate 1, the heat exchange tube 2, the bottom plate 408, the top plate 409, the bottom cover 409, and the top cover 411 are all made of stainless steel and connected by welding, and the solder is a nickel-based corrosion-resistant material, which improves the structural stability of the heat exchanger.

The embodiment of the utility model also provides a gas water heater, comprising the heat exchanger as described above. The high-temperature flue gas generated by combustion in the gas water heater fully exchanges heat with the cold water entering the gas water heater, thereby improving the thermal efficiency.

The gas water heater also includes a primary heat exchanger, the smoke exhaust port of the primary heat exchanger is connected to the smoke inlet of the heat exchanger through a pipe, and the water inlet of the primary heat exchanger is connected to the water outlet of the heat exchange tube 2. The heat exchanger acts as a secondary heat exchanger, and the high-temperature smoke in the primary heat exchanger flows into the heat exchanger, and is discharged after preheating the cold water that will enter the primary heat exchanger. The preheated cold water flows into the primary heat exchanger through a pipe, and is heated by the heat generated by the combustion of gas for use by users, which not only recovers the waste heat of the high-temperature smoke, but also increases the water temperature of the water inlet of the primary heat exchanger, thereby improving the overall thermal efficiency of the primary heat exchanger and the gas water heater. The overall efficiency of the gas water heater is 102-105%, which is much higher than the energy efficiency of only setting a primary heat exchanger.

Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims (10)

1. A heat exchanger, wherein a heat exchange tube is mounted on the heat exchanger, a heat exchange plate is mounted on the heat exchange tube, a first end and a second end which are opposite are arranged on the heat exchange plate, and the first end is positioned downstream of the second end in the fluid flow direction;

The heat exchange plate is provided with a heat exchange tube hole, the heat exchange tube penetrates through the heat exchange tube hole, the heat exchange plate is provided with a first flow passage and a second flow passage which are communicated with the first end and the second end, and the first flow passage and the second flow passage are positioned on two sides of the heat exchange tube hole and are intersected at the first end.

2. The heat exchanger of claim 1, wherein the heat exchanger plate further comprises first and second opposite edges, the first and second edges being connected to the first and second ends at opposite sides of the heat exchanger tube aperture, the edges of the first and second edges being provided with first flanges turned over to the same side, the first flanges of the first edges being mated with the heat exchanger tube to form the first flow channel, the first flanges of the second edges being mated with the heat exchanger tube to form the second flow channel.

3. The heat exchanger of claim 2, wherein a second flange is provided at an edge of the heat exchange tube hole, the second flange has the same folding direction as the first flange, a flow guiding part is formed on the second flange at a junction of the first flow passage and the second flow passage, the flow guiding part protrudes toward the first end, and two sides of the flow guiding part are relatively concave.

4. A heat exchanger as claimed in claim 3 wherein the flow guide tapers from an end remote from the first end to an end adjacent the first end.

5. The heat exchanger of claim 2, wherein at least two heat exchange tube holes are arranged between the first side and the second side, a V-shaped flanging with an opening facing the outer side of the heat exchange plate is arranged between the two heat exchange tube holes at the first end, fluid communication is carried out between two adjacent heat exchange tube holes, and two side edges of the V-shaped flanging and the heat exchange tube at the corresponding side form a flow passage respectively.

6. The heat exchanger of claim 1, further comprising a housing having a flue gas outlet and a flue gas inlet, the flue gas outlet and the flue gas inlet being on the same side of the housing, a baffle being disposed within the housing, the baffle dividing the housing into a first chamber and a second chamber in communication, the first chamber being connected to the flue gas inlet, the second chamber being connected to the flue gas outlet, the first chamber and the second chamber being in communication on a side remote from the flue gas outlet and the flue gas inlet.

7. The heat exchanger of claim 6, wherein the fluid flow path between the flue gas outlet and the flue gas inlet intersects the axis of the heat exchange tube.

8. The heat exchanger of claim 1, wherein the heat exchanger plates are stainless steel heat exchanger plates.

9. A gas water heater comprising a heat exchanger as claimed in any one of claims 1 to 8.

10. The gas water heater of claim 9, further comprising a primary heat exchanger, wherein a smoke outlet of the primary heat exchanger is connected to a smoke inlet of the heat exchanger by a pipe, and wherein a water inlet of the primary heat exchanger is connected to a water outlet of the heat exchange pipe.