Countercurrent multi-channel stainless steel heat exchanger for hot bath, heat dissipation and heating

Abstract

The positions, close to the two ends, between every two adjacent outer pipes are communicated through an outer communicating pipe, in the arrangement of the outer pipes, two inner pipes are arranged in every two outer pipes respectively, only one inner pipe is arranged in the other outer pipes, every two adjacent inner pipes are communicated through an inner communicating pipe, and the inner pipes are communicated through an outer communicating pipe. A part of the outer communicating pipes are provided with inner communicating pipes, the rest of the outer communicating pipes are not provided with inner communicating pipes, the two sides of the inner pipes on the outermost sides are welded to the outer pipes through discs at one ends of the inner communicating pipes, and tap water threaded head seats for tap water in the inner pipes to flow in and out are arranged on the outer pipes. The tube bundle structure is characterized in that two communicated inner tubes are respectively arranged in each outer tube of the two outer tubes at the uppermost end of the tube bundle structure, the outer diameters of the four communicated inner tubes are tightly connected to form a vertical shape, one inner tube is respectively arranged in the outer tube without two inner tubes, and the adjacent inner tubes arranged by being separated from the outer tubes are communicated through an inner communicating tube.

Description

Technical Field

[0001] This invention relates to a liquid heat exchanger, specifically to a water exchanger that uses household heating systems (water or steam heating) as a heat source, and belongs to the category of hot water supply devices. Background Technology

[0002] In existing technology, a large pipe contains a smaller pipe, and the smaller pipe contains an even smaller pipe. The end caps of the smaller pipes and the smaller pipes inside the smaller pipe extend beyond the outer cover of the large pipe and are welded together inside the manifold. The manifold is welded to both ends of the large pipe and consists of two semicircles. The first semicircle is welded to both ends of the large pipe for sealing. The second semicircle is then welded together after the end caps of the two smaller pipes inside the large pipe and the connecting pipe are welded to form a closed manifold. The technical drawbacks are: the manifold has a large water storage space, while the large pipe has a small water storage space, inevitably leading to leakage at the weld between the manifold and the large pipe due to the difference in expansion coefficients. In current water supply networks, whether for heating water or tap water, the pump pressure inevitably creates a mixture of water in the air and air in the water, resulting in significant pressure expansion and leakage at the weld between the first semicircle and the large pipe. Furthermore, in existing technology, the cold water pipe return path of the storage heat exchanger is short, and the heat source temperature cannot be completely absorbed by the cold fluid, resulting in incomplete heat exchange. This leads to interruptions in the temperature exchange, preventing a complete shower and requiring waiting for heating to resume. Whether it's a single pipe with multiple branches or a coiled system, the heat exchange occurs within the pipe or the tank itself. The characteristic is that the hot and cold water pipes are isolated after heat exchange, failing to provide a cohesive heating effect. In existing household heat exchanger technology, there are three types: (1) Water tank storage type, using heating water to conduct heat to the tap water. The drawback is that after the stored hot water is used up, there is a waiting period of about half an hour before hot water can be exchanged again; (2) Reverse flow type (also called counter-flow type), where heating water enters at a high position and exits at a low position, while tap water enters at a high position and exits at a low position. This structure typically uses a tubular design, with a large pipe containing smaller pipes. The large pipe holds the tap water for storage. To meet shower water demand, the large pipe needs to be long and have many columns. The drawback is that it requires more material and occupies more space; (3) Multi-channel type... The counter-flow instantaneous heat exchanger uses a large pipe containing multiple evenly distributed smaller pipes. The large pipe carries heating water, while the smaller pipes carry tap water. The heating water temperature needs to be around 63 degrees Celsius to provide a continuous supply of hot tap water instantly. However, this design has drawbacks: it requires a high inlet water temperature and a large number of smaller pipes. This increased number of smaller pipes also increases the amount of welding, which in turn increases the risk of leaks. This increases costs, labor intensity, and quality instability. It is particularly unsuitable for the low-temperature inlet water used in 85% of underfloor heating systems, severely limiting its marketability and causing inconvenience to users. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects of the prior art and provide a simple structure for heating. A counter-current multi-channel instantaneous heat exchanger device can be used to exchange cold water into hot water for bathing, while also solving the problem of using hot water for washing dishes and laundry in winter.

[0004] To achieve the above objectives, the technical solution provided by this invention is as follows: A stainless steel heat exchanger for counter-current multi-channel instantaneous heating and bathing includes an outer tube, an inner tube, an outer tube end cap, an inner tube end cap, an outer connecting pipe, and an inner connecting pipe arranged in parallel. The arrangement of the tubes must have at least four combined tubes, with an outer tube enclosing an inner tube. The outer tubes of the tube arrangement carry heating water. Heating water inlet heads are respectively installed at both ends of the outer tubes on both sides of the tube arrangement. Adjacent outer tubes are connected near their ends by an outer connecting pipe. In the arrangement of the outer tubes, two outer tubes each contain two inner tubes, while the remaining outer tubes only contain one inner tube. An inner tube is provided, and adjacent inner tubes are connected by an inner connecting tube. Some outer connecting tubes have inner connecting tubes, while the remaining outer connecting tubes do not. The two outermost inner tubes are welded to the outer tubes on both sides through a disc at one end of the inner connecting tube. The outer tubes are provided with water inlet / outlet connectors for the tap water in the inner tubes. The characteristic feature is that each of the two outer tubes at the top of the pipe structure is provided with two connected inner tubes. The outer diameters of the four connected inner tubes are closely connected in a vertical shape. Each outer tube without two inner tubes is provided with one inner tube. Adjacent inner tubes separated by outer tubes are connected by an inner connecting tube.

[0005] The adjacent outer pipes are connected by two external connecting pipes to form a pipe row structure. Heating water thread holders are provided on both sides of the outer end of the outer pipe of the pipe row structure. Inlet and outlet thread holders of the inner pipe are provided on both sides of the outer pipe of the pipe row structure near the pipe end. The inner pipe is welded to the inner connecting pipe. The flanged and stretched steps of the disc are inserted into the inwardly flanged circular hole in the inner pipe. The cross-section is flush and fused. The end face of the disc is fitted with the end face of the thread holder and welded in a circular shape to form a sealed channel for tap water to enter and exit the inner pipe, and also a sealed channel for heating water to enter and exit.

[0006] A tap water hot water outlet tap is located near the threaded connector of the heating water inlet, and a tap water inlet tap is located near the threaded connector of the heating water outlet; at least two inner pipes are closely connected inside the several outer pipes, and the height of the two inner pipes after their outer diameters match is close to the height of the inner diameter of the outer pipe.

[0007] The inner tubes of the two tubes have inwardly flanged holes near both ends. The diameter of these holes is matched and welded to the inner connecting tube. The flanged stretching step of the disc is inserted into the inwardly flanged circular hole in the inner tube. The cross-sections are flush and fused together. The end face of the disc is fitted and circumferentially welded to the end face of the threaded seat. There are at least four outer tubes. Double rows of inner tubes can be set inside the outer tubes or multiple outer tubes.

[0008] The implementation method of the stainless steel heat exchanger for counter-current multi-channel instant hot water bathing and heating is characterized by the following process steps: Step 1: The hot water from the tap in the inner tube is pushed upward along the inner tube by the pressure of the cold water at the lower end of the tap.

[0009] Step 2: During the process of the inner pipe traveling in series, the newly introduced cold water exchanges heat with at least four outer pipes at the bottom. The newly introduced cold water will inevitably lower the temperature of the heating water in these four outer pipes. Since the heating water in all the outer pipes is constantly circulating, the cold tap water in the inner pipes is like climbing stairs, getting a few degrees hotter with each floor. When it climbs to the sixth floor, it is equivalent to the sixth outer pipe. At this time, the temperature of the tap water in the inner pipe is 4-5 degrees different from the temperature of the heating water in the sixth outer pipe.

[0010] Step 3: After heat exchange, the hot tap water continues to be pushed into the seventh outer pipe at the top. At this time, the heating water in the seventh outer pipe is relatively hot, and the temperature of the tap water in the inner pipe continues to rise, approaching the inlet temperature of the heating water in the seventh outer pipe. There are two inner pipes with close connection between the upper and lower pipes inside the seventh outer pipe. After heat transfer between the inner pipes running in series and the inner pipes with close connection between the upper and lower pipes, the temperature of the heating water entering the seventh outer pipe is basically reached.

[0011] Step 4: The tap water in the inner pipe, which has basically reached the inlet temperature of the heating water in the outer pipe, continues to flow into the eighth outer pipe at the top. At this time, the heating water in the eighth outer pipe at the top is the hottest. Due to three heat exchanges: first, water storage heat exchange; second, counter-current heat exchange; and third, counter-current heat exchange between the tap water in the inner pipe of the eighth outer pipe and the eighth outer pipe, the heat exchange ratio between the hot tap water coming out of the inner pipe of the eighth outer pipe and the hot heating water in the eighth outer pipe reaches 1:1, and the hot tap water flows out continuously.

[0012] Step 5: Due to the use of thin-walled stainless steel pipes, the heat conduction and dissipation effect is heat transfer.

[0013] Beneficial effects: When the outer diameters of the two inner tubes are closely connected, they conduct heat to each other, similar to huddling together for warmth. For example, Antarctic penguins use a common ability among warm-blooded animals, "countercurrent heat exchange," to prevent their exposed feet from freezing. Simply put, it's a way to reduce heat loss. Specifically, each penguin's foot has two blood vessels that constantly transfer heat to each other, allowing them to survive in cold environments. This invention also utilizes this principle. When warm water enters the outer tube and comes into contact with the uppermost inner tube, the inner tubes are tightly connected like the height of a building. The difference is that the water flow in the inner tubes is either a single series or a parallel series, but a series series is preferred, just like the constant-temperature heat transfer between two blood vessels in each penguin's foot. Similarly, at key locations and points, the system utilizes the circulating heat exchange of the hottest heating water, following the atmospheric principle of heat rising. The inner pipes inside the two outer pipes at the top are designed in a three-dimensional shape, with heat always being transferred upwards. Since the hot water outlet is located next to the heating water inlet in the outer pipe, heating water continuously enters and hot water continuously exits, forming a counter-current contact heat exchange. The optimal heat exchange pathway is located here, allowing hot water to continuously flow out when the user needs hot water, forming instantaneous heat exchange. After the hot water flows out of the top inner pipe, the hot water from the several lower inner pipes follows and flows towards the outlet, providing sufficient time for heat exchange to meet the water demand. In existing technologies, most systems use single strings of thin 8mm copper or stainless steel pipes. Even if you use a sufficiently long pipe, the hot water from the tap water flows out instantly due to the high pressure and flow rate, leaving no time for heat exchange. This is because the capacity of the 8mm pipe, the flow rate of the tap water, and the heat exchange time are not proportional. The national standard of 65 degrees Celsius for radiator inlet water temperature is not implemented in various places, and underfloor heating is often used, which involves low-temperature inlet water. As a result, many cities can only wash their hands and vegetables but cannot take a bath.If 8mm pipes are used, the length must be at least 40 meters, and the heating water temperature must be around 65 degrees Celsius. The water tank must also be large enough to achieve an instant heating effect, which increases costs. This invention overcomes the shortcomings of the above three heat exchange methods: structural changes reduce material weight and save costs; fewer welds result in stable quality; and a large water capacity ensures a continuous supply of hot water from the tap. The counter-current flow is not limited by the inlet water temperature of the underfloor heating system and provides instant hot water (market research conducted by the inventors showed that the inlet water temperature for underfloor heating is no less than 42 degrees Celsius, and the indoor temperature is above 18 degrees Celsius. This is due to the poor heat dissipation of plastic pipes in underfloor heating and the poor thermal conductivity of the cement layer on the surface. The conclusion is that the inlet water temperature for underfloor heating should not be less than 42 degrees Celsius). This invention employs three heat exchange methods at the crucial heat exchange path and at the highest point of heat rise: first, water storage heat exchange; second, counter-current heat exchange; and third, tap water and tap water working together for heating, achieving... To achieve optimal heat exchange performance, the inventive combination of this invention with existing technology is not obvious, nor could it have been conceived by those skilled in the art. Specifically, the structure of the two inner tubes in close contact involves punching and flanging holes near both ends of the inner tube. Each inner tube requires two holes, with the punching and flanging positions of each inner tube being opposite. When the two inner tubes are placed side by side, an inner connecting tube is inserted, and welding is performed inside the inner tubes. After welding the inner connecting tubes, the end caps of the inner tubes are welded. Subsequently, a pressure test is performed on the inner tubes. If there is no leak, the end caps of the outer tube are welded, and another pressure test is performed on the outer tube. If there is no leak, the welding is considered qualified. Due to the adoption of the technical solution described in this invention, the current market situation has been changed. Using SUS304 stainless steel tubes as the material of the heat exchanger can further improve the heat exchange efficiency of this invention, effectively increase the anti-aging strength of the heat exchanger, further prevent the corrosion of the solid impurities, and improve the heat exchange efficiency. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings:

[0015] Figure 1 , one A structural diagram of a stainless steel heat exchanger for a counter-current, multi-channel, instantaneous heating system for showering and bathing.

[0016] Figure 2 yes Figure 1 Side view.

[0017] Figure 3 yes Figure 1 Enlarged view of a portion of the diagram. Detailed Implementation

[0019] The present invention is as follows Figures 1 to 3As shown, a stainless steel heat exchanger for counter-current multi-channel instant heating and bathing includes a parallel arrangement of outer pipe 1, inner pipe 2, outer pipe end cap 3, inner pipe end cap 4, outer connecting pipe 5, and inner connecting pipe 6. The arrangement of the pipes requires at least four combinations of outer pipe 1 and inner pipe 2. The outer pipe 1 carries heating water. Heating water inlet fittings 7 are installed at both ends of the outermost two outer pipes 1. Adjacent outer pipes 1 are connected near their ends by an outer connecting pipe 5. In the arrangement of the outer pipes 1, two outer pipes 1 each contain two inner pipes 2, while the remaining outer pipes 1 contain only one inner pipe 2. Adjacent inner pipes 2 are connected... The outer pipes 5 are connected by an inner connecting pipe 6. Some outer connecting pipes 5 have an inner connecting pipe 6, while the remaining outer connecting pipes 5 do not. The two outermost inner pipes 2 are welded to the outer pipes 1 by a disc 8 at one end of the inner connecting pipe 6. The outer pipes 1 are provided with tap water inlet / outlet seats 7 for the tap water in the inner pipes 2. The characteristic is that each of the two outer pipes 1 at the top of the pipe structure is provided with two connected inner pipes 2. The outer diameters of the four connected inner pipes 2 are closely connected in a vertical shape 9. The outer pipes 1 without two inner pipes 2 are each provided with one inner pipe 2. The adjacent inner pipes 2 separated by the outer pipes 1 are connected by an inner connecting pipe 6.

[0020] The adjacent outer pipes 1 are connected by two outer connecting pipes 5 to form a pipe row structure. The two end caps 3 on both sides of the outer pipe 1 of the pipe row structure are provided with heating water thread holders 7. The inlet and outlet thread holders 7 of the inner pipe 2 are provided on both sides of the outer pipe 1 near the pipe end. The inner pipe 2 is welded to the inner connecting pipe 6. The flanged stretching step of the disc 8 is inserted into the inwardly flanged circular hole in the inner pipe 2. The cross-section is flush and fused. The end face of the disc 8 is fitted with the end face of the thread holder 7 and welded in a circular shape to form a sealed channel for tap water in and out of the inner pipe 2, and also a sealed channel for heating water in and out.

[0021] A hot water outlet tap 7 is installed near the heating water inlet tap 7, and a hot water outlet tap 7 is installed near the heating water outlet tap 7; at least two inner pipes 2 are installed inside the plurality of outer pipes 1, and the height of the two inner pipes 2 after their outer diameters match is close to the height of the inner diameter of the outer pipe 1.

[0022] The inner tubes 2 of the two tubes are provided with inwardly flanged holes 10 near both ends. The diameter of the holes 10 is matched and welded to the inner connecting tube 6. The flanged stretching step of the disc 8 is inserted into the inwardly flanged circular hole in the inner tube 2. The cross-section is flush and fused together. The end face of the disc 8 is fitted and circumferentially welded to the end face of the threaded seat 7. There are at least four outer tubes 1. The double-row inner tubes 2 set in the outer tubes 1 can also be set in multiple outer tubes 1.

[0023] The implementation method of the stainless steel heat exchanger for counter-current multi-channel instant hot water bathing and heating is characterized by the following process steps: First, the hot water outlet of the inner tube 2 is pushed upward along the inner tube 2 by the pressure of the cold water outlet at the lower end.

[0024] The second step involves the incoming cold water exchanging heat with at least four outer pipes 1 at the bottom during the series movement of the inner pipe 2. The incoming cold water will inevitably lower the temperature of the heating water in these four outer pipes 1. Since the heating water in all the outer pipes 1 is constantly circulating, the cold tap water in the inner pipe 2 will become hotter with each floor, like climbing stairs. When it reaches the sixth floor, it is equivalent to the sixth outer pipe 1. At this time, the temperature of the tap water in the inner pipe 2 is 4-5 degrees Celsius different from the temperature of the heating water in the sixth outer pipe 1.

[0025] In the third step, the hot tap water after heat exchange continues to be pushed into the seventh outer pipe 1 at the top. At this time, the heating water in the seventh outer pipe 1 is relatively hot, and the temperature of the tap water in the inner pipe 2 continues to rise, approaching the inlet temperature of the heating water in the seventh outer pipe 1. There are two inner pipes 2 with the upper and lower pipes closely connected inside the seventh outer pipe 1. After the heat transfer between the inner pipes 2 running in series and the inner pipes 2 with the upper and lower pipes closely connected, the temperature of the heating water inlet in the seventh outer pipe 1 is basically reached.

[0026] Step 4: The tap water in the inner pipe 2, which has basically reached the inlet temperature of the heating water in the outer pipe 1, continues to flow into the top eighth outer pipe 1. At this time, the heating water in the top eighth outer pipe 1 is the hottest. Due to three heat exchanges, namely: first, water storage heat exchange; second, counter-flow heat exchange; and third, counter-flow heat exchange between the tap water in the inner pipe 2 of the eighth outer pipe and the eighth outer pipe, the heat exchange ratio between the hot tap water coming out of the inner pipe 2 of the top eighth outer pipe and the hot heating water in the eighth outer pipe 1 reaches 1:1, and the hot tap water flows out continuously.

[0027] Step 5: Due to the use of thin-walled stainless steel pipes, the heat conduction and dissipation effect is heat transfer.

[0028] The above description is not limited to the preferred embodiment. Anyone can make various modifications and improvements based on the guidance of this invention, and all such modifications and improvements fall within the protection scope of this invention.

Claims

1. A stainless steel heat exchanger for counter-current multi-channel instantaneous heating and bathing, comprising a parallel arrangement of an outer pipe (1), an inner pipe (2), an outer pipe end cap (3), an inner pipe end cap (4), an outer connecting pipe (5), and an inner connecting pipe (6). The arrangement of the pipes shall have at least four pipes, such as an outer pipe (1) enclosing an inner pipe (2). The outer pipe (1) of the pipe arrangement carries heating water. Heating water inlet heads (7) are respectively installed at both ends of the outer pipes (1) on the outermost two sides of the pipe arrangement. Adjacent outer pipes (1) are connected near their ends by an outer connecting pipe (5). In the arrangement of pipes (1), two outer pipes (1) are respectively provided with two inner pipes (2), and the remaining outer pipes (1) are only provided with one inner pipe (2). Adjacent inner pipes (2) are connected by an inner connecting pipe (6). Some outer connecting pipes (5) have an inner connecting pipe (6), and the remaining outer connecting pipes (5) do not have an inner connecting pipe (6). The two sides of the outermost inner pipes (2) are welded to the outer pipes (1) by a disc (8) at one end of the inner connecting pipe (6). The outer pipes (1) are provided with a tap water inlet / outlet seat (7) for the tap water in the inner pipes (2). The feature is: The two outer pipes (1) at the top of the pipe structure are each provided with two connected inner pipes (2). The outer diameters of the four connected inner pipes (2) are closely connected in a vertical shape (9). The outer pipes (1) without two inner pipes (2) are each provided with one inner pipe (2). The adjacent inner pipes (2) separated by the outer pipes (1) are connected by an inner connecting pipe (6).

2. The stainless steel heat exchanger for counter-current multi-channel instantaneous heating and bathing as described in claim 1, characterized in that: The adjacent outer pipes (1) are connected by two external connecting pipes (5) to form a pipe row structure. The two end caps (3) on both sides of the outer pipe (1) of the pipe row structure are provided with heating water thread head seats (7). The inlet and outlet thread seats (7) of the inner pipe (2) are provided on both sides of the outer pipe (1) of the pipe row structure near the pipe end. The inner pipe (2) is welded to the inner connecting pipe (6). The flange stretching step of the disc (8) is inserted into the inward flanged round hole in the inner pipe (2). The cross-section is flush and fused. The end face of the disc (8) is fitted with the end face of the thread seat (7) and welded in a circular shape to form a sealed channel for tap water in and out of the inner pipe (2), and also a sealed channel for heating water in and out.

3. The stainless steel heat exchanger for counter-current multi-channel instantaneous heating and bathing as described in claim 1, characterized in that: A hot water outlet valve (7) is installed near the inlet valve (7) of the heating water system. A tap water inlet valve (7) is installed near the outlet valve of the heating water supply; at least two inner pipes (2) are installed inside the several outer pipes (1), and the height of the two inner pipes (2) after their outer diameters match is close to the height of the inner diameter of the outer pipe (1).

4. The stainless steel heat exchanger for counter-current multi-channel instantaneous heating and bathing as described in claim 1, characterized in that: The inner tubes (2) of the two tubes are provided with inwardly turned holes (10) near both ends. The diameter of the holes (10) is matched and welded with the inner connecting tube (6). The turned-up step of the disc (8) is inserted into the inwardly turned circular hole in the inner tube (2). The cross-section is flush and fused. The end face of the disc (8) is fitted and circumferentially welded with the end face of the threaded seat (7). The outer tubes (1) are at least four or more. The double-row inner tubes (2) set in the outer tubes (1) can also be set in multiple outer tubes (1).

5. A method for implementing a stainless steel heat exchanger for counter-current multi-channel instantaneous heating and bathing as described in claim 1, characterized in that... The process includes the following steps: Step 1: The hot water from the tap in the inner pipe (2) is pushed upward by the pressure of the cold tap water at the bottom, which pushes the stored hot water upward along the inner pipe (2) in series. Step 2: During the process of the inner pipe (2) being pushed forward in series, the newly introduced cold water exchanges heat with at least four outer pipes (1) at the bottom. The newly introduced cold water will inevitably lower the temperature of the heating water in these four outer pipes (1). Since the heating water in all the outer pipes (1) is constantly circulating, the cold water in the inner pipe (2) is like climbing stairs, getting hotter at each floor. When it climbs to the sixth floor, it is equivalent to the sixth outer pipe (1). At this time, the temperature of the tap water in the inner pipe (2) is 4-5 degrees different from the temperature of the heating water in the sixth outer pipe (1). Step 3: After heat exchange, the hot water from the tap continues to move towards the top seventh outer pipe (1). At this time, the heating water in the seventh outer pipe (1) is relatively hot, and the temperature of the tap water in the inner pipe (2) continues to rise, approaching the inlet temperature of the heating water in the seventh outer pipe (1). There are two inner pipes (2) with the upper and lower pipes closely connected inside the seventh outer pipe (1). After the heat transfer between the inner pipe (2) that runs in series and the inner pipe (2) with the upper and lower pipes closely connected, the temperature of the heating water in the seventh outer pipe (1) is basically reached. Step 4: The tap water in the inner pipe (2), which has basically reached the temperature of the heating water in the outer pipe (1), continues to push towards the top eighth outer pipe (1). At this time, the heating water in the top eighth outer pipe (1) is the hottest. Due to the three heat exchanges, namely: first, water storage heat exchange; second, counter-current heat exchange; and third, the tap water in the inner pipe (2) of the eighth outer pipe and the counter-current heat exchange between the tap water and the eighth outer pipe, the hot tap water coming out of the inner pipe (2) of the top eighth outer pipe and the hot heating water in the eighth outer pipe (1) exchange heat at a ratio of 1:1, and the hot tap water flows out continuously. Step 5: Due to the use of thin-walled stainless steel pipes, the heat conduction and dissipation effect is heat transfer.

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