Heat exchanger and gas water heater
By using the thermally conductive contact between the inlet pipe and the connecting pipe, the problem of complex piping and high cost caused by bypass pipes in gas water heaters is solved. This reduces the temperature rise during water outages and simplifies the piping, avoiding gasification noise and blockage risks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG VANWARD NEW ELECTRIC CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-06-12
AI Technical Summary
Existing gas water heaters reduce the temperature rise during water outages by using bypass pipes, which increases the complexity of the piping in the heat exchange tubes, increases costs, and increases the risk of gasification noise and bypass pipe blockage.
The outer wall of the inlet pipe is in thermally conductive contact with the outer wall of the connecting pipe, and heat exchange is achieved through the low temperature water in the inlet pipe and the high temperature water in the connecting pipe, which simplifies the pipeline structure and avoids the use of bypass pipes.
It effectively reduces the water temperature inside the heat exchanger, prevents temperature rise during water outages, simplifies piping, reduces costs, and avoids the risks of vaporization noise and bypass pipe blockage.
Smart Images
Figure CN224353634U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas water heater technology, and in particular to a heat exchanger and a gas water heater. Background Technology
[0002] Gas water heaters use an air-cooled structure instead of coils for heat exchange to reduce costs. However, eliminating the coils reduces the water volume inside the heat exchanger. When the gas water heater is turned off, the residual heat inside will heat the water in the heat exchange tubes (i.e., water outage temperature rise). When the heater is turned on again, the outlet water temperature will be higher than the set temperature, resulting in a poor user experience.
[0003] Currently, a bypass pipe is typically connected between the inlet and outlet pipes. This allows a portion of the low-temperature water in the inlet pipe to be diverted into the outlet pipe, where it mixes quickly with the high-temperature water and cools down, thus addressing the issue of temperature rise during water outages. However, the use of a bypass pipe not only increases the complexity of the heat exchanger's piping and raises costs, but also poses risks such as vaporization noise and bypass pipe blockage. Utility Model Content
[0004] One of the technical problems solved by this utility model is to provide a heat exchange tube that can effectively solve the technical problems in the prior art that lead to increased complexity of the pipeline inside the heat exchange tube, high cost, and easy occurrence of vaporization noise and bypass pipe blockage due to the use of bypass pipes to reduce the water outage temperature rise.
[0005] The second technical problem solved by this utility model is to provide a gas water heater that can effectively solve the technical problems in the prior art that lead to increased complexity of the pipeline in the heat exchange tube, high cost, and easy occurrence of gasification noise and bypass pipe blockage due to the use of bypass pipes to reduce the temperature rise during water outages.
[0006] The first technical problem mentioned above is solved by the following technical solution:
[0007] A heat exchanger includes heat exchange tubes, connecting pipes, an inlet pipe, and an outlet pipe. Multiple heat exchange tubes are connected in series, and the ends of two adjacent heat exchange tubes are connected through the connecting pipe. Along the water flow direction inside the heat exchange tubes, one end of the first heat exchange tube is connected to the inlet pipe, and one end of the last heat exchange tube is connected to the outlet pipe. The outer wall of the inlet pipe is connected to the outer wall of at least one connecting pipe.
[0008] Compared with the prior art, the heat exchanger described in this utility model has the following advantages:
[0009] The outer wall of the inlet pipe is in thermally conductive contact with the outer wall of at least one connecting pipe. Heat exchange is achieved through the low-temperature water in the inlet pipe and the high-temperature water in the connecting pipe, effectively reducing the water temperature inside the heat exchanger. This prevents excessively high water temperatures during restarts, thus avoiding the risk of water outage temperature rise and improving the user experience. Furthermore, the thermally conductive contact between the inlet pipe and the connecting pipe reduces the water outage temperature rise, eliminating the need for an additional bypass pipe, simplifying the heat exchanger piping, reducing costs, and avoiding the risks of vaporization noise and bypass pipe blockage associated with using a bypass pipe.
[0010] In one embodiment, the outer wall of the inlet pipe is in direct contact with the outer wall of the connecting pipe.
[0011] In one embodiment, the outer wall of the inlet pipe is in contact with the wall of the connecting pipe through a thermally conductive material.
[0012] In one embodiment, the thermally conductive material is solder, and the outer wall of the water inlet pipe is welded to the outer wall of the connecting pipe through the solder.
[0013] In one embodiment, the thermally conductive material is a thermally conductive adhesive, and the outer wall of the water inlet pipe is bonded to the outer wall of the connecting pipe through the thermally conductive adhesive.
[0014] In one embodiment, the thermal conductivity of the thermally conductive adhesive is greater than or equal to the thermal conductivity of the connecting pipe and the water inlet pipe.
[0015] In one embodiment, the water inlet pipe includes a first pipe body, a second pipe body, and a third pipe body connected in sequence. The end of the first pipe body away from the second pipe body is used to connect to the water supply pipe. The outer wall of the second pipe body is in thermal contact with the outer wall of the connecting pipe. Along the water flow direction in the heat exchange pipe, the end of the third pipe body away from the second pipe body is connected to one end of the first heat exchange pipe.
[0016] In one embodiment, the connecting pipe is a U-shaped pipe, the second pipe body is a straight pipe, and the outer wall of the second pipe body is in thermally conductive contact with the outer wall of the bend of the U-shaped pipe.
[0017] In one embodiment, the connecting pipe is a U-shaped pipe, and the second pipe body includes a bent pipe body. The bent pipe body is arranged circumferentially on the outer side of the U-shaped pipe, and the outer side of the pipe wall of the U-shaped pipe is in thermal contact with the outer side of the pipe wall of the bent pipe body.
[0018] In one embodiment, the second tube is positioned above or below the connecting tube along the height direction of the heat exchanger.
[0019] In one embodiment, the inner diameter of the second tube is greater than the inner diameters of the first tube and the third tube.
[0020] The second technical problem mentioned above is solved by the following technical solution:
[0021] Gas water heaters, including the heat exchangers mentioned above.
[0022] Compared with the prior art, the gas water heater described in this utility model has the following beneficial effects:
[0023] Heat exchange is achieved by using low-temperature water in the inlet pipe and high-temperature water in the connecting pipe, effectively reducing the water temperature inside the heat exchanger. This prevents excessively high water temperatures during restarts, thus avoiding water outage temperature rise and improving the user experience. Simultaneously, the thermally conductive contact between the inlet and connecting pipes reduces water outage temperature rise, eliminating the need for an additional bypass pipe. This simplifies the heat exchanger piping, reduces costs, and avoids the risks of vaporization noise and bypass pipe blockage associated with using a bypass pipe. Attached Figure Description
[0024] Figure 1 This is a top view of the heat exchanger provided in Embodiment 1 of this utility model;
[0025] Figure 2 This is a right view of the heat exchanger provided in Embodiment 1 of this utility model;
[0026] Figure 3 This is a top view of the heat exchanger provided in Embodiment 2 of this utility model;
[0027] Figure 4 This is a top view of the first type of heat exchanger provided in Embodiment 3 of this utility model;
[0028] Figure 5 This is a right view of the first type of heat exchanger provided in Embodiment 3 of this utility model;
[0029] Figure 6 This is a top view of the second type of heat exchanger provided in Embodiment 3 of this utility model;
[0030] Figure 7 This is a right view of the second type of heat exchanger provided in Embodiment 3 of this utility model.
[0031] The component names and labels in the diagram are as follows:
[0032] 1. Heat exchange tube; 2. Connecting pipe; 3. Water inlet pipe; 31. First tube body; 32. Second tube body; 321. Bent tube body; 33. Third tube body; 4. Water outlet pipe; 5. Heat exchange fins. Detailed Implementation
[0033] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.
[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0036] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0037] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0038] Example 1
[0039] This embodiment proposes a gas water heater, which includes a combustion device and a heat exchanger. The combustion device generates high-temperature flue gas by burning gas, and the high-temperature flue gas heats low-temperature water through the heat exchanger, so that the gas water heater can provide hot water at a set temperature to the user. Since gas water heaters are existing technology, their structure and operation will not be described in detail.
[0040] In existing heat exchangers, a bypass pipe is typically connected between the inlet and outlet pipes. This allows a portion of the low-temperature water in the inlet pipe to be diverted into the outlet pipe, where it mixes rapidly with the high-temperature water and cools down, thus addressing the issue of temperature rise during water outages. However, the use of a bypass pipe not only increases the complexity of the heat exchanger's piping and raises costs, but also poses risks such as vaporization noise and bypass pipe blockage.
[0041] To solve the above problems, such as Figure 1 and Figure 2 As shown in the figure, this embodiment also proposes a heat exchanger, which includes heat exchange tubes 1, connecting pipes 2, inlet pipes 3, and outlet pipes 4. Multiple heat exchange tubes 1 are connected in series, and the ends of adjacent heat exchange tubes 1 are connected through connecting pipes 2. Along the water flow direction within the heat exchange tubes 1, one end of the first heat exchange tube 1 is connected to the inlet pipe 3, and one end of the last heat exchange tube 1 is connected to the outlet pipe 4. The outer wall of the inlet pipe 3 is in thermally conductive contact with the outer wall of at least one connecting pipe 2. This thermally conductive contact between the outer wall of the inlet pipe 3 and the outer wall of at least one connecting pipe 2 enables heat exchange between the low-temperature water in the inlet pipe 3 and the high-temperature water in the connecting pipes 2, effectively reducing the water temperature within the heat exchanger and preventing excessive water temperature rise during restart, thus improving the user experience. Meanwhile, the thermally conductive contact between the inlet pipe 3 and the connecting pipe 2 reduces the temperature rise during water outages, eliminating the need for an additional bypass pipe, simplifying the heat exchanger piping, reducing costs, and avoiding the risks of vaporization noise and bypass pipe blockage associated with using a bypass pipe.
[0042] In one embodiment, the aforementioned thermally conductive contact can be direct contact, i.e., the outer wall of the inlet pipe 3 is in direct contact with the outer wall of the connecting pipe 2. Direct contact results in a simple structure and lower cost, while also facilitating direct heat exchange between the inlet pipe 3 and the connecting pipe 2, effectively reducing the water temperature inside the heat exchanger and preventing excessively high water temperature during restart, thus preventing water outage temperature rise.
[0043] In one embodiment, the aforementioned thermally conductive contact can also be achieved indirectly through a thermally conductive material. The outer wall of the inlet pipe 3 and the wall of the connecting pipe 2 are in contact through a thermally conductive material, allowing heat exchange between the inlet pipe 3 and the connecting pipe 2. This increases the contact area between the inlet pipe 3 and the connecting pipe 2, improves the heat exchange efficiency, and effectively reduces the water temperature inside the heat exchanger. The aforementioned thermally conductive material can be solder, thermally conductive adhesive, etc., and is not specifically limited here.
[0044] In an optional embodiment, when the thermally conductive material is solder, the outer wall of the inlet pipe 3 is welded to the outer wall of the connecting pipe 2 using solder. The contact between the inlet pipe 3 and the connecting pipe 2 is achieved through welding, which improves the connection strength and stability between them, thus ensuring the heat exchange effect of the inlet pipe 3 and the connecting pipe 2.
[0045] In an optional embodiment, when the thermally conductive material is thermally conductive adhesive, the outer wall of the inlet pipe 3 and the outer wall of the connecting pipe 2 are bonded together using thermally conductive adhesive. This bonding method achieves contact between the inlet pipe 3 and the connecting pipe 2, making the bonding operation simple and easy, improving the assembly efficiency of the heat exchanger, and reducing the cost of the heat exchanger.
[0046] It should be noted that the thermal conductivity of the thermally conductive adhesive is greater than or equal to that of the connecting pipe 2 and the water inlet pipe 3. Because the thermal conductivity of the thermally conductive adhesive is not less than that of the connecting pipe 2 and the water inlet pipe 3, the heat exchange efficiency between the bonded connecting pipe 2 and the water inlet pipe 3 is guaranteed.
[0047] Specifically, the heat exchanger also includes heat exchange plates 5, each with heat exchange tube holes. Multiple heat exchange plates 5 are stacked, allowing the heat exchange tube holes to be connected sequentially. This enables the heat exchange tubes 1 to pass through the coaxially arranged heat exchange tube holes, allowing high-temperature flue gas to exchange heat with the low-temperature water inside the heat exchange tubes 1 as it passes through the heat exchange plates 5. Multiple heat exchange tubes 1 are connected in series, and their ends are connected by connecting pipes 2, forming an S-shape. The water flow direction within the heat exchange tubes 1 refers to the direction in which the low-temperature water flows out through the inlet pipe 3, the heat exchange tubes 1, and the outlet pipe 4. Along the water flow direction within the heat exchange tubes 1, the heat exchange tube 1 connected to the inlet pipe 3 is the first heat exchange tube 1, and the heat exchange tube 1 connected to the outlet pipe 4 is the last heat exchange tube 1. One end of the inlet pipe 3 is connected to an external water supply pipe to provide low-temperature water (cold water or room temperature water). The other end of the inlet pipe 3 is connected to the first heat exchange tube 1. One end of the outlet pipe 4 is connected to the last heat exchange pipe 1, and the other end of the outlet pipe 4 is connected to the water user to provide hot water to the water user.
[0048] In this embodiment, multiple heat exchange tubes 1 are arranged at the same height, resulting in a heat exchange tube group within the heat exchanger. The inlet pipe 3 is located on the right side of the heat exchanger, and the outlet pipe 4 is located on the left side. The outer wall of the inlet pipe 3 contacts the outer walls of the two connecting pipes 2 on the right side of the heat exchanger to improve heat exchange efficiency. Of course, the outer wall of the inlet pipe 3 may also only contact the outer wall of one connecting pipe 2 on the right side of the heat exchanger, or the number of connecting pipes 2 in contact with the inlet pipe 3 can be flexibly adjusted according to heat exchange requirements; no specific limitation is made here. In other embodiments, multiple heat exchange tubes 1 may also be arranged in two or more groups of heat exchange tubes at intervals along the height direction of the heat exchanger (vertical direction in the figure). The inlet pipe 3 may contact the connecting pipes 2 at the ends of one or more groups of heat exchange tubes (simply by extending the length of the inlet pipe 3), further increasing the heat exchange efficiency between the connecting pipes 2 and the inlet pipe 3 and improving the reduction effect of water outage temperature rise.
[0049] Specifically, such as Figure 1 and Figure 2 As shown, the water inlet pipe 3 includes a first pipe body 31, a second pipe body 32, and a third pipe body 33 connected in sequence. The end of the first pipe body 31 away from the second pipe body 32 is used to connect to the water supply pipe. The outer wall of the second pipe body 32 is in thermally conductive contact with the outer wall of the connecting pipe 2. Along the water flow direction in the heat exchange pipe 1, the end of the third pipe body 33 away from the second pipe body 32 is connected to one end of the first heat exchange pipe 1.
[0050] In this embodiment, the connecting pipe 2 is a U-shaped pipe, and the second pipe body 32 is a straight pipe. The outer wall of the second pipe body 32 is in thermally conductive contact with the outer wall of the bend in the U-shaped pipe. Because the second pipe body 32 is a straight pipe, the length of the inlet pipe 3 can be minimized, thereby reducing costs and pipeline complexity. The second pipe body 32 extends in the front-to-back direction and is fixedly connected to the tops of the two U-shaped pipes on the right side of the heat exchanger by welding.
[0051] In one embodiment, the inner diameter of the second pipe 32 is larger than the inner diameters of the first pipe 31 and the third pipe 33. By increasing the inner diameter of the second pipe 32, the water volume inside the second pipe 32 is relatively higher, thereby increasing the heat absorption of the second pipe 32, improving the heat exchange effect between the second pipe 32 and the connecting pipe 2, and further reducing the temperature rise during water outages.
[0052] The gas water heater in this embodiment includes the heat exchanger described above. Heat exchange is achieved through the low-temperature water in the inlet pipe 3 and the high-temperature water in the connecting pipe 2, effectively reducing the water temperature inside the heat exchanger and preventing temperature rise during water outages. Simultaneously, no additional bypass pipe is required, simplifying the heat exchanger piping, reducing costs, and avoiding the risks of vaporization noise and bypass pipe blockage associated with using a bypass pipe.
[0053] Example 2
[0054] like Figure 3 As shown, this embodiment proposes a heat exchanger, the main difference of which is that the structure of the second tube 32 is different from that in Embodiment 1.
[0055] Specifically, the connecting pipe 2 is a U-shaped pipe, and the second pipe body 32 includes a bent pipe body 321. The bent pipe body 321 is arranged circumferentially on the outer side of the U-shaped pipe, and the outer wall of the U-shaped pipe is in thermally conductive contact with the outer wall of the bent pipe body 321. The second pipe body 32 is formed by bending to form the bent pipe body 321, and the bent pipe body 321 is adapted to the connecting pipe 2, so that the bent pipe body 321 wraps around the outer side of the connecting pipe 2. The bent pipe body 321 and the wrapped connecting pipe 2 are in contact through direct contact, welding or bonding, which increases the contact area between the second pipe body 32 and the connecting pipe 2, thereby improving the heat exchange efficiency between the second pipe body 32 and the connecting pipe 2, and further reducing the water shut-off temperature rise of the heat exchanger.
[0056] like Figure 3 As shown, the second tube body 32 has two bent tube bodies 321, which are welded to two connecting pipes 2 one-to-one. The two bent tube bodies 321 of the second tube body 32 are integrally formed by bending according to the curvature of the connecting pipes 2, resulting in a simple structure. In other embodiments, the bent tube bodies 321 can also be separated from the second tube body 32, allowing them to be assembled with the second tube body 32 via pipe fittings. It can be understood that the second tube body 32 may also have only one bent tube body 321, or the number and size of the bent tube bodies 321 may be adaptively adjusted according to the number of connecting pipes 2 on the right side of the heat exchanger.
[0057] Example 3
[0058] like Figures 4-7 As shown, this embodiment proposes a heat exchanger. The main difference between this heat exchanger and the one in Embodiment 1 is that the thermal contact position between the second tube 32 and the connecting tube 2 is different.
[0059] Specifically, along the height direction of the heat exchanger, the second tube 32 is positioned above or below the connecting pipe 2. Compared to the second tube 32 only making thermal conductive contact with the top of the connecting pipe 2, this embodiment increases the contact area between the second tube 32 and the connecting pipe 2 by positioning the second tube 32 above or below the connecting pipe 2, thereby improving the heat exchange efficiency between the second tube 32 and the connecting pipe 2 and further reducing the temperature rise during water outages in the heat exchanger.
[0060] like Figure 4 and Figure 5 As shown, along the height direction of the heat exchanger, the second tube 32 is positioned below the connecting tube 2. Figure 6 and Figure 7As shown, the second tube 32 is positioned above the connecting pipe 2 along the height direction of the heat exchanger. This arrangement not only effectively reduces the temperature rise during water outages in the heat exchanger, but also allows the second tube 32 and the connecting pipe 2 to be stacked together along the height direction of the heat exchanger, achieving a compact installation of the piping within the heat exchanger. This reduces the space occupied by the second tube 32 along the length direction of the heat exchanger (left-right direction in the figure), which helps to reduce the volume and floor space of the heat exchanger, facilitating its installation and use.
[0061] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A heat exchanger, characterized in that, It includes heat exchange tubes (1), connecting pipes (2), inlet pipes (3) and outlet pipes (4). Multiple heat exchange tubes (1) are connected in series, and the ends of two adjacent heat exchange tubes (1) are connected through the connecting pipes (2). Along the water flow direction in the heat exchange tubes (1), one end of the first heat exchange tube (1) is connected to the inlet pipe (3), and one end of the last heat exchange tube (1) is connected to the outlet pipe (4). The outer wall of the inlet pipe (3) is in thermal contact with the outer wall of at least one connecting pipe (2).
2. The heat exchanger according to claim 1, characterized in that, The outer wall of the inlet pipe (3) is in direct contact with the outer wall of the connecting pipe (2).
3. The heat exchanger according to claim 1, characterized in that, The outer wall of the water inlet pipe (3) is in contact with the wall of the connecting pipe (2) through a thermally conductive material.
4. The heat exchanger according to claim 3, characterized in that, The thermally conductive material is solder, and the outer wall of the water inlet pipe (3) is welded to the outer wall of the connecting pipe (2) through the solder.
5. The heat exchanger according to claim 3, characterized in that, The thermally conductive material is thermally conductive adhesive, and the outer wall of the water inlet pipe (3) is bonded to the outer wall of the connecting pipe (2) through the thermally conductive adhesive.
6. The heat exchanger according to claim 5, characterized in that, The thermal conductivity of the thermally conductive adhesive is greater than or equal to that of the connecting pipe (2) and the water inlet pipe (3).
7. The heat exchanger according to any one of claims 1 to 6, characterized in that, The water inlet pipe (3) includes a first pipe body (31), a second pipe body (32) and a third pipe body (33) connected in sequence. The end of the first pipe body (31) away from the second pipe body (32) is used to connect to the water supply pipe. The outer side of the pipe wall of the second pipe body (32) is in thermal contact with the outer side of the pipe wall of the connecting pipe (2). Along the water flow direction in the heat exchange pipe (1), the end of the third pipe body (33) away from the second pipe body (32) is connected to the end of the first heat exchange pipe (1).
8. The heat exchanger according to claim 7, characterized in that, The connecting pipe (2) is a U-shaped pipe, the second pipe body (32) is a straight pipe, and the outer wall of the second pipe body (32) is in thermal contact with the outer wall of the bend of the U-shaped pipe.
9. The heat exchanger according to claim 7, characterized in that, The connecting pipe (2) is a U-shaped pipe, and the second pipe body (32) includes a bent pipe body (321). The bent pipe body (321) is arranged circumferentially on the outer side of the U-shaped pipe, and the outer side of the pipe wall of the U-shaped pipe is in thermal contact with the outer side of the pipe wall of the bent pipe body (321).
10. The heat exchanger according to claim 7, characterized in that, Along the height direction of the heat exchanger, the second tube (32) is disposed above or below the connecting tube (2).
11. The heat exchanger according to claim 7, characterized in that, The inner diameter of the second tube (32) is greater than the inner diameters of the first tube (31) and the third tube (33).
12. A gas-fired water heater, characterized in that, The heat exchanger includes any one of claims 1 to 11.