A flue gas condenser with expansion margin
By optimizing the water cover structure in the flue gas condenser and introducing a bending expansion section, the problem of damage to the flow cavity structure caused by the expansion of water upon freezing was solved, thus achieving durability and economic benefits for the equipment in extremely cold environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG GUANGTAO HEALTHY KITCHEN UTENSILS CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-07-03
AI Technical Summary
In extremely cold environments, the water inside the heat exchange tubes of the flue gas heat exchanger freezes and expands, causing the flow cavity structure to rupture, resulting in sealing failure and product damage.
By optimizing the structure of the water cover plate and introducing a bending expansion section to provide sufficient expansion margin, the flow cavity structure is prevented from being torn apart when the water freezes and expands.
This effectively avoids damage to the flow chamber structure caused by the expansion of water upon freezing, thus improving the equipment's cold resistance and service life.
Smart Images
Figure CN224454917U_ABST
Abstract
Description
Technical fields:
[0001] This utility model belongs to the field of flue gas condenser technology, and specifically refers to a flue gas condenser with expansion margin. Background technology:
[0002] A flue gas heat exchanger disclosed in a Chinese utility model patent (authorization announcement number CN219841818U) includes a shell with a central partition dividing the shell's inner cavity into an outlet chamber and an inlet chamber. Several heat exchange tubes are arranged in both the outlet and inlet chambers, with corresponding ends of adjacent tubes connected via a flow cavity on the shell. An inlet port is provided in the inlet chamber. The heat exchange tubes are circular, smooth tubes arranged in the inlet and outlet chambers, perpendicular to the flue gas flow direction. As a heat exchange device for a wall-hung boiler, the flue gas heat exchanger achieves heat exchange through direct contact between high-temperature flue gas and the heat exchange tubes, allowing the liquid inside the tubes to be heated and output as heat from the boiler.
[0003] However, in the face of sudden extreme cold in northern regions, if the wall-mounted boiler is not turned on in time, the water in the heat exchange tubes of its flue gas heat exchanger will freeze into ice. As is well known, water freezing will increase in volume by more than 10%. Therefore, when the water in the heat exchange tubes and flow chamber freezes and expands outward, the shell structure forming the flow chamber (which is generally made of two metal plates welded together) is very easy to be broken, resulting in the failure of the seal of the heat exchange tubes and flow chamber, and causing damage to the overall function of the product. Summary of the Invention:
[0004] The purpose of this invention is to provide a flue gas condenser with expansion margin, which optimizes the structure of the water cover plate used to form the flow cavity. The bending expansion part on the water cover plate provides sufficient expansion margin when the water freezes and expands, thereby effectively preventing the flow cavity structure from being torn due to the expansion of the water.
[0005] This utility model is implemented as follows:
[0006] A flue gas condenser with expansion margin includes a shell and several heat absorption tubes arranged laterally on the shell. The ends of adjacent heat absorption tubes are connected through a flow cavity to form a water flow channel. The shell includes two left and right distributed support plates. The left and right ends of the heat absorption tubes are respectively fitted through and fitted onto the corresponding support plates. A water-passing cover is provided on the side wall of the opposite side of the two support plates. The flow cavity is formed between the water-passing cover and the support plates. The water-passing cover located in part of the flow cavity has a bending expansion part that can undergo metal deformation.
[0007] In the flue gas condenser with expansion margin described above, the water flow channel is distributed in a serpentine pattern, and the water outlet and water inlet of the water flow channel are respectively arranged on two of the water flow chambers. The bending expansion part is arranged on the water flow chamber located between the two ends of the water flow channel.
[0008] In the above-mentioned flue gas condenser with expansion margin, the inner sidewall of the water cover plate is recessed outward to form a flow groove, and the flow groove and the support plate form the flow cavity. The edge of the inner sidewall of the water cover plate is attached to the outer sidewall of the support plate and fixed by hot melt welding.
[0009] In the flue gas condenser with expansion margin described above, the bent expansion section is a wave-shaped structure formed by bending the water cover plate outward.
[0010] Alternatively, the bending expansion portion may include an inner arch formed by the inner sidewall of the water cover plate arching inward, and an annular groove formed by the surface of the inner arch recessing outward.
[0011] The outstanding advantages of this utility model compared to the prior art are:
[0012] This utility model has a simple structure, low cost and high economic benefits. By reasonably optimizing the structure of the water-passing cover plate used to form the flow cavity, the bending expansion part on the water-passing cover plate can provide sufficient expansion margin when the water freezes and expands, thereby effectively avoiding the phenomenon that the flow cavity structure is broken due to the expansion of the water when it freezes. Attached image description:
[0013] Figure 1 This is a three-dimensional view of the entire machine of this utility model;
[0014] Figure 2 This is a three-dimensional view of the entire machine of this utility model;
[0015] Figure 3 This is a perspective view of one of the water cover plates of this utility model.
[0016] In the diagram: 1. Heat absorption tube; 2. Support plate; 3. Water cover; 4. Bending expansion section; 5. Water inlet; 6. Water outlet; 7. Flow groove; 8. Inner arch; 9. Annular groove. Detailed implementation method:
[0017] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —3:
[0018] A flue gas condenser with expansion margin includes a shell and several heat absorption tubes 1 arranged laterally on the shell. The ends of adjacent heat absorption tubes 1 are connected through a flow cavity to form a water flow channel. The shell includes two left and right distributed support plate portions 2. The left and right ends of the heat absorption tubes 1 are respectively connected to the corresponding support plate portions 2. A water passage cover plate 3 is provided on the side wall of the opposite side of the two support plate portions 2. The flow cavity is formed between the water passage cover plate 3 and the support plate portion 2. The water passage cover plate 3 located in part of the flow cavity has a bending expansion portion 4 that can undergo metal deformation.
[0019] This utility model has a simple structure, low cost and high economic benefits. By reasonably optimizing the structure of the water cover plate 3 used to form the flow cavity, the bending expansion part 4 on the water cover plate 3 can provide sufficient expansion margin when the water freezes and expands, thereby effectively avoiding the phenomenon that the flow cavity structure is broken due to the expansion of the water freezing.
[0020] In this embodiment, the water flow channel is distributed in a serpentine shape, and the water outlet 6 and the water inlet 5 of the water flow channel are respectively set on two of the water flow chambers. Since the water will flow out on its own when the water at both ends of the water flow channel freezes, it is not easy for the water to freeze and break the connection structure between the corresponding water flow chamber or the heat absorption pipe 1 and the corresponding component. Therefore, the bending expansion part 4 is set on the water flow chamber located between the two ends of the water flow channel.
[0021] Meanwhile, the specific cooperation structure between the water cover plate 3 and the support plate 2 is as follows: the inner sidewall of the water cover plate 3 is recessed outward to form a flow groove 7, the flow groove 7 and the support plate 2 form the flow cavity, and the edge of the inner sidewall of the water cover plate 3 is attached to the outer sidewall of the support plate 2 and fixed by hot melt welding.
[0022] Furthermore, in this embodiment, the bending expansion portion 4 includes an inner arch platform 8 formed by the inner sidewall of the water cover plate 3 arching inward, and an annular groove 9 formed by the platform surface of the inner arch platform 8 being recessed outward.
[0023] Furthermore, the bending expansion section 4 can also adopt another structure: the bending expansion section 4 is a wave-shaped structure formed by bending the water cover plate 3 outward.
[0024] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.
Claims
1. A flue gas condenser with expansion margin, comprising a shell and a plurality of heat-absorbing tubes (1) arranged laterally on the shell, wherein the ends of adjacent heat-absorbing tubes (1) are connected through a flow cavity to form a water flow channel, characterized in that: The shell includes two left and right distributed support plate parts (2). The left and right ends of the heat absorption tube (1) are respectively connected to the corresponding support plate parts (2). A water-passing cover plate (3) is provided on the side wall of the opposite side of the two support plate parts (2). The flow cavity is formed between the water-passing cover plate (3) and the support plate parts (2). The water-passing cover plate (3) located in part of the flow cavity has a bending expansion part (4) that can undergo metal deformation.
2. A flue gas condenser with expansion margin according to claim 1, characterized in that: The water flow channel is distributed in a serpentine shape, and the water outlet (6) and water inlet (5) of the water flow channel are respectively set on two of the water flow chambers. The bending expansion part (4) is set on the water flow chamber located between the two ends of the water flow channel.
3. A flue gas condenser with expansion margin according to claim 1, characterized in that: The inner sidewall of the water cover plate (3) is recessed outward to form a flow groove (7), and the flow groove (7) and the support plate part (2) form the flow cavity. The inner sidewall edge of the water cover plate (3) is attached to the outer sidewall of the support plate part (2) and fixed by hot melt welding.
4. A flue gas condenser with an expansion margin according to claim 1 or 2 or 3, characterized in that: The bending expansion section (4) is a wave-shaped structure formed by bending the water cover plate (3) outward; Alternatively, the bending expansion portion (4) may include an inner arch platform (8) formed by the inner sidewall of the water cover plate (3) arching inward, and an annular groove (9) formed by the platform surface of the inner arch platform (8) being recessed outward.