Drainage water seal assembly and air heater

Abstract

The present application relates to the technical field of warm air furnace, and discloses a drainage water seal assembly and a warm air furnace, which comprise a water seal structure, a connecting portion and a drainage portion, the connecting portion and the drainage portion are communicated through a bottom communication pipe, the connecting portion and the drainage portion extend upward respectively, the top end of the connecting portion is provided with a through hole, a drainage pipe is adapted to communicate with the drain port of the water collecting tank of the warm air furnace, the drainage pipe comprises a first pipe section penetrating through the through hole, and an elastic member acts on the water seal structure, and when no water is arranged in the water seal structure, the elastic force of the elastic member causes the bottom plane of the connecting portion to abut against the bottom end of the first pipe section. The present application can effectively block the outside air from pouring into the water collecting tank through the water seal structure, the drainage pipe and the drain port of the water collecting tank, and can avoid the problem that the outside air blows inward through the drain port to cause the condensed water to be unable to be discharged from the drain port of the water collecting tank.

Description

Technical Field

[0001] This invention relates to the field of heating furnace technology, specifically to a drainage water seal assembly and a heating furnace. Background Technology

[0002] Gas-fired central heating boilers typically have a water seal at the drain outlet to prevent the leakage of flue gas after combustion and to prevent the intake of non-combustion air, thus avoiding wasting fan performance. During initial startup, if insufficient water is added to the water seal to achieve a proper seal, the drain outlet of the boiler's water tank will draw air from the outside through the water seal. This inward blowing force prevents condensate from draining properly. When too much condensate accumulates, it can clog the pressure tap near the drain outlet under the action of the exhaust fan. This pressure tap is used to determine if the drain outlet is blocked during boiler operation. Therefore, if the boiler misjudges a blockage, it may stop working, impacting the user experience. Summary of the Invention

[0003] In view of this, the present invention provides a drainage water seal assembly and a warm air furnace to solve the problem that when insufficient water is added to the water seal structure, condensate cannot be discharged, which may cause the whole machine to misjudge that the drain outlet is blocked and stop working.

[0004] In a first aspect, the present invention provides a drainage water seal assembly, comprising: A water seal structure includes a connecting part and a drain part. The connecting part and the drain part are connected by a bottom connecting pipe. The connecting part and the drain part extend upward respectively. The top of the connecting part is provided with a through opening. A drain pipe adapted to connect to the drain outlet of a water collection tank of a hot air furnace, the drain pipe including a first pipe section passing through the through-hole; An elastic element acts on the water seal structure. When no water is placed in the water seal structure, the elastic force of the elastic element causes the bottom plane of the connection to abut against the bottom end of the first pipe section.

[0005] Beneficial effects: Through the cooperation of the water seal structure, drain pipe, and elastic element, when the central heating furnace is started for the first time and the water seal structure is not pre-filled with sufficient water for sealing, the elastic force of the elastic element causes the bottom plane of the connection part to abut against the bottom end of the first pipe section. This effectively prevents outside air from flowing back into the water collection tank through the water seal structure, drain pipe, and drain port of the water collection tank. This fundamentally avoids the problem of outside air blowing in through the drain port, causing condensate to be unable to drain from the drain port of the water collection tank. Therefore, condensate can be drained normally, preventing excessive condensate from accumulating at the drain port and clogging the pressure tap near the drain port. This also avoids the detection signal distortion caused by water accumulation at the pressure tap, effectively solving the problem of the central heating furnace misjudging the drain port blockage and causing the whole unit to shut down. This ensures the working stability of the gas central heating furnace during initial start-up and normal operation, and greatly improves the user experience. By combining a water seal structure, drain pipe, and elastic element, condensate can be discharged normally even during the initial startup of the warm air furnace when the water seal structure has not been pre-filled with sufficient water. Therefore, it is not necessary to manually add water to the water seal structure in advance, eliminating the need for manual pre-filling. When water is added to the water seal structure, or when condensate is drained into the water seal structure through the drain pipe, the weight of the water seal structure itself, combined with the weight of the water, overcomes the elastic force of the elastic element, causing the water seal structure to move downward relative to the drain pipe. This creates a gap between the bottom end of the drain pipe and the bottom plane of the connection part, allowing condensate to flow out of the drain pipe and into the drainage section through the connecting pipe at the bottom, forming a water seal in the drainage section, which effectively prevents flue gas leakage.

[0006] In one alternative embodiment, the elastic element is disposed between the connecting portion and the first pipe segment.

[0007] Beneficial effects: By placing the elastic element between the connection part and the first pipe section, no external installation space is required, and the overall layout of the original drainage water seal component is not changed. At the same time, it can prevent the elastic element from being exposed to oil, dust, and condensate corrosion and aging, thus extending the service life of the elastic element. It can maintain the automatic sealing performance under waterless conditions for a long time, further reducing the probability of the heating furnace stopping malfunctions and improving the overall reliability and service life of the machine.

[0008] In one alternative embodiment, the top of the connecting portion is provided with an inwardly extending first flange, the inner side of the first flange forms the through opening, and the first end of the elastic member abuts against the first flange.

[0009] Beneficial effects: By setting an inwardly extending first flange at the top of the connector and using the inner side of the first flange to form a through opening, the first pipe section of the drain pipe passing through can be radially limited and centered, avoiding skewed or eccentric assembly of the first pipe section and ensuring the coaxial fit accuracy between the pipe section and the connector. At the same time, the first end of the elastic element is abutted and limited at the first flange, and the flange structure of the first flange forms a reliable axial support point, providing a fixed force reference for the elastic element and preventing the elastic element from slipping, shifting, or coming out of the assembly position during the pressure process. This makes the force on the elastic element more uniform and stable, and it can output an upward elastic force to the water seal structure through the first flange, ensuring that the bottom plane of the connector and the bottom end of the first pipe section are tightly fitted and sealed when no water is placed in the water seal structure.

[0010] In one alternative embodiment, the first pipe segment has an outwardly extending second flange at one end inside the connection portion. When no water is provided in the water seal structure, the elastic force of the elastic member causes the second flange to abut against the bottom plane of the connection portion.

[0011] Beneficial effects: The first pipe section has an outwardly extending second flange at one end inside the connection part. The second flange forms an annular limiting support surface. When no water is placed in the water seal structure, the second flange and the bottom plane of the connection part form a precise sealing fit end face, which can increase the effective sealing contact area, improve the fit and sealing performance, and avoid the problem of local gap leakage caused by the narrow end face of the first pipe section and the processing tolerance.

[0012] In one alternative embodiment, the second end of the elastic element abuts against the second flange.

[0013] Beneficial effects: The first end of the elastic element abuts against the first flange, and the second end abuts against the second flange. The first and second flanges limit the ends of the elastic element and provide reliable force points, ensuring that the elastic element will not experience axial movement, radial displacement, or skew or twisting, and will always maintain a vertical and regular force state, with stable and controllable elastic deformation direction. At the same time, the first and second flanges form a closed limiting protection for the elastic element, which can prevent condensate, dust, and impurities from adhering to the elastic element and causing the impurities to cause jamming on the elastic element's rebound, and prevent condensate from corroding the elastic element. This effectively extends the service life of the elastic element, maintains stable elastic pre-tightening performance over a long period of time, and continuously avoids faults such as blocked condensate drainage, false detection of pressure taps, and accidental shutdown of the whole machine, greatly improving the reliability of the gas central heating furnace during initial start-up and long-term operation.

[0014] In one optional embodiment, the top end of the connecting portion is provided with an inwardly extending first flange, the inner side of the first flange forms the through opening, the end of the first pipe segment located inside the connecting portion is provided with an outwardly extending second flange, a flexible sealing membrane is provided between the first flange and the second flange, the flexible sealing membrane surrounds the first pipe segment, and the elastic element is provided on the outside of the water seal structure.

[0015] Beneficial Effects: A flexible sealing membrane arranged around the first pipe section between the first and second flanges can form a comprehensive seal in both radial and circumferential directions over the assembly gaps between the first pipe section and the connecting part. This fills the tiny gaps caused by component assembly tolerances, preventing outside air from seeping into the water collection tank through pipe gaps, further improving the airtightness in the waterless state, and preventing inward airflow from hindering the normal discharge of condensate. Because the flexible sealing membrane has deformable and self-adaptive properties, it can adapt to the eccentricity of the first pipe section assembly, slight vibration displacement, and thermal expansion and contraction deformation, always adhering to and covering the outer periphery of the pipe body. It will not produce air leakage gaps due to minor structural misalignments, exhibiting strong sealing adaptability and high fault tolerance. The elastic element is arranged on the outside of the water seal structure, forming a dual-protection layout with the internal flexible sealing membrane. The internal flexible sealing membrane achieves airtight sealing of the gaps, while the external elastic element provides overall pre-tightening force, ensuring that the second flange and the bottom plane of the connecting part remain tightly pressed together in the waterless condition. The dual seals work together to significantly improve the sealing reliability in the waterless condition. In addition, placing the elastic element on the outside of the water seal structure facilitates its disassembly, assembly, and maintenance.

[0016] In one optional embodiment, a first drain outlet is provided on one side of the drainage section. The first drain outlet is horizontally arranged, and the elastic element is configured such that when the liquid level in the water seal structure is not lower than the first drain outlet, the bottom end of the first pipe section is not higher than the first drain outlet.

[0017] Beneficial effects: A horizontally arranged first drain outlet on one side of the drainage section ensures smooth drainage of condensate and facilitates external piping. The elastic element is designed so that when the liquid level in the water seal structure is not lower than the first drain outlet, the bottom of the first pipe section is not higher than the first drain outlet. This ensures that the condensate covers the bottom of the first pipe section, forming a reliable water seal that blocks flue gas and effectively prevents combustion flue gas from leaking out through the drain outlet. It also prevents excess outside air from being drawn into the furnace by the fan through the drain outlet, reducing ineffective air intake losses, lowering the fan load, saving energy, and ensuring the combustion efficiency and fan performance of the hot air furnace. When the liquid level in the water seal structure reaches the height of the first drain outlet, the condensate in the water seal structure will be discharged through the first drain outlet. This prevents condensate from accumulating in the water seal structure and causing condensate to accumulate at the drain outlet of the water collection tank. Therefore, it avoids the fault of the hot air furnace misjudging the drain outlet as blocked by condensate and forcibly shutting down, ensuring continuous and stable operation of the entire unit. In addition, the water seal is ensured by the structure of the elastic element itself, and the structure is simple, compact and has few parts.

[0018] In one alternative embodiment, the top of the drainage section is provided with a second drainage outlet, and the bottom side of the drainage outlet is provided with a third drainage outlet, and a plug is detachably provided at the third drainage outlet.

[0019] Beneficial effects: A second drain outlet is located at the top of the drainage section. When water needs to be added to the water seal structure, it can be added through the first drain outlet to form a water seal. The second drain outlet, located at the top of the drainage section, serves as an overflow protection port. When the condensate level inside the water seal structure rises abnormally and exceeds the normal operating level, the excess condensate can overflow and be discharged promptly from the top second drain outlet, preventing backflow into the water collection tank and furnace body due to excessive liquid level. This effectively prevents water from entering the furnace body, causing internal components to become damp and corrode, thus improving the overall safety protection level of the machine. A third drain outlet is located on one side of the bottom of the drainage section, at the lowest point. It can collect dirt, impurities, silt, and residual water deposited at the bottom of the water seal structure. During normal operation, the plug blocks the third drain outlet, ensuring that the water seal structure can store water normally and form a water seal. When it is necessary to clean the dirt inside the water seal structure, the plug can be removed to achieve thorough drainage and emptying at a low level, preventing impurities from accumulating inside the water seal for a long time, causing pipe blockage, odor, and the growth of dirt, and ensuring that the drainage channel is unobstructed and clean for a long time.

[0020] In one optional embodiment, the drain pipe further includes a connecting pipe section located at the top of the first pipe section. The connecting pipe section is adapted to be connected to the drain outlet of the water collection tank via an adapter. The outer diameter of the connecting pipe section is larger than the outer diameter of the first pipe section. When the bottom end of the first pipe section abuts against the bottom plane of the connecting part, the connecting pipe section abuts against the top of the connecting part.

[0021] Beneficial effects: The drain pipe also includes a connecting pipe section located at the top of the first pipe section. The outer diameter of the connecting pipe section is larger than that of the first pipe section, which facilitates the fitting and connection of the connecting pipe section with the adapter. Because the outer diameter of the connecting pipe section is larger than that of the first pipe section, the larger outer diameter of the connecting pipe section allows condensate to flow out of the collection tank more smoothly and steadily.

[0022] In one alternative embodiment, there is no gap between the first pipe segment and the through port.

[0023] Beneficial effects: The seamless design between the first pipe section and the through-hole prevents outside air from seeping in and backflowing through the assembly gap between the through-hole and the first pipe section. This further enhances the overall airtightness in the water-seal-free state, preventing airflow from entering the water collection tank through gaps and creating inward blowing force. Structurally, it eliminates the problem of condensate being unable to drain properly due to airflow obstruction. Furthermore, the seamless fit between the first pipe section and the through-hole provides circumferential constraint and centering for the first pipe section, limiting radial displacement and eccentric tilt. This ensures that the first pipe section, the bottom plane of the connection, and the second flange remain coaxially aligned, resulting in a uniform circumferential distribution of the preload of the elastic element and balanced sealing force. This prevents localized air leakage and seal failure due to pipe misalignment. In addition, it can prevent dust, condensation scale, and small impurities from entering the water seal structure through the gaps, avoid impurities from getting stuck in the elastic parts, sealing mating surfaces and drainage channels, reduce the risk of pipe scaling and blockage, maintain the smooth flow of drainage channels and the working accuracy of the sealing structure for a long time, and stably avoid the phenomenon of pressure tap blockage and the furnace misjudging drainage failure and shutting down.

[0024] Secondly, the present invention also provides a warm air furnace, comprising: The water collection tank is provided with a drain outlet and a first pressure tap, the first pressure tap being adjacent to the drain outlet; The drainage water seal assembly is described above, wherein the drainage pipe is connected to the drainage outlet.

[0025] Beneficial effects: This central heating furnace, through the cooperation of a water seal structure, drain pipe, and elastic element, effectively prevents outside air from flowing back into the water tank through the water seal structure and drain port when the furnace is first started and the water seal structure is not pre-filled with sufficient water. The elastic force of the elastic element causes the bottom plane of the connection part to abut against the bottom end of the first pipe section. This effectively prevents outside air from blowing in through the drain port and causing condensate to be unable to drain from the water tank. Therefore, condensate can be discharged normally, preventing excessive condensate from accumulating at the drain port and clogging the first pressure tap near the drain port. This avoids the detection signal distortion of the first pressure tap due to water accumulation, effectively solving the problem of the heating furnace misjudging the drain port blockage and causing the whole unit to shut down. This ensures the working stability of the gas central heating furnace during initial start-up and normal operation, greatly improving the user experience. By combining a water seal structure, drain pipe, and elastic element, condensate can be discharged normally even during the initial startup of the warm air furnace when the water seal structure has not been pre-filled with sufficient water. Therefore, it is not necessary to manually add water to the water seal structure in advance, eliminating the need for manual pre-filling. When water is added to the water seal structure, or when condensate is drained into the water seal structure through the drain pipe, the weight of the water seal structure itself, combined with the weight of the water, overcomes the elastic force of the elastic element, causing the water seal structure to move downward relative to the drain pipe. This creates a gap between the bottom end of the drain pipe and the bottom plane of the connection part, allowing condensate to flow out of the drain pipe and into the drainage section through the connecting pipe at the bottom, forming a water seal in the drainage section, which effectively prevents flue gas leakage. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional view of the water seal structure in a drainage water seal assembly according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a drain pipe in a drainage water seal assembly according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a drainage water seal assembly according to an embodiment of the present invention when the water seal structure is not filled with water; Figure 4 This is a front view of a drainage water seal assembly according to an embodiment of the present invention when the water seal structure is not filled with water; Figure 5 This is a perspective sectional view of a drainage water seal assembly according to an embodiment of the present invention when the water seal structure is not filled with water; Figure 6 This is a front sectional view of a drainage water seal assembly according to an embodiment of the present invention when the water seal structure is not filled with water; Figure 7 This is a schematic diagram of a drainage water seal assembly according to an embodiment of the present invention, after water is added to the water seal structure, or after condensate is discharged into the water seal structure through a drain pipe; Figure 8 This is a front view of a drainage water seal assembly according to an embodiment of the present invention, after water is added to the water seal structure or condensate is discharged into the water seal structure through a drain pipe. Figure 9 This is a three-dimensional cross-sectional view of a drainage water seal component according to an embodiment of the present invention, after water is added to the water seal structure or condensate is discharged into the water seal structure through a drain pipe. Figure 10 This is a front sectional view of a drainage water seal assembly according to an embodiment of the present invention, after water is added to the water seal structure or condensate is discharged into the water seal structure through a drain pipe. Figure 11 This is a cross-sectional view of a drainage water seal assembly according to an embodiment of the present invention, wherein a flexible sealing membrane is provided on the first flange and the second flange; Figure 12 This is a cross-sectional view of a drainage water seal assembly according to an embodiment of the present invention, showing no gap between the first pipe section and the through-hole. Figure 13 This is the front view of the water collection tank; Figure 14 This is a right view of the water collection tank.

[0028] Explanation of reference numerals in the attached figures: 1. Water seal structure; 101. Connecting part; 1011. Bottom plane; 1012. Through port; 1013. First flange; 102. Drainage part; 103. Connecting pipe; 104. First drain outlet; 105. Second drain outlet; 106. Third drain outlet; 2. Drainage pipe; 201. First pipe section; 202. Second flange; 203. Connecting pipe section; 3. Elastic element; 4. Flexible sealing membrane; 5. Water collection tank; 501. Drain outlet; 502. First pressure tap; 503. Exhaust fan inlet; 504. Second pressure tap; 6. Plug. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] The following is combined with Figures 1 to 14 The following describes embodiments of the present invention.

[0034] According to an embodiment of the present invention, a drainage water seal assembly is provided, including a water seal structure 1, a drainage pipe 2, and an elastic element 3.

[0035] The water seal structure 1 includes a connecting part 101 and a drain part 102, which are connected by a bottom connecting pipe 103. The connecting part 101 and the drain part 102 extend upwards respectively, and the top of the connecting part 101 has a through-hole 1012. The drain pipe 2 is adapted to connect with the drain outlet 501 of the water collection tank 5 of the hot air furnace, and includes a first pipe section 201 passing through the through-hole 1012. The elastic element 3 acts on the water seal structure 1; when no water is provided in the water seal structure 1, such as... Figure 5 and Figure 6 As shown, the elastic force of the elastic member 3 causes the bottom plane 1011 of the connecting part 101 to abut against the bottom end of the first pipe section 201.

[0036] In this embodiment, the water seal structure 1, drain pipe 2, and elastic element 3 work together to ensure that, during the initial startup of the central heating furnace and before the water seal structure 1 is pre-filled with sufficient water for sealing, the elastic force of the elastic element 3 causes the bottom plane 1011 of the connecting part 101 to abut against the bottom end of the first pipe section 201. This effectively prevents outside air from flowing back into the water collection tank 5 through the drain outlet 501 of the water seal structure 1, drain pipe 2, and water collection tank 5. This fundamentally avoids the problem of outside air blowing in through the drain outlet 501, preventing condensate from being discharged from the drain outlet 501 of the water collection tank 5. Therefore, condensate can be discharged normally, preventing excessive condensate from accumulating at the drain outlet 501 and clogging the pressure tap near the drain outlet 501. This also prevents the pressure tap from being blocked by water, causing the detection signal to be distorted. This effectively solves the problem of the central heating furnace misjudging the drain outlet 501 as blocked, leading to the shutdown of the entire unit. This ensures the stability of the gas central heating furnace during initial startup and normal operation, significantly improving the user experience. By cooperating with the water seal structure 1, drain pipe 2, and elastic element 3, condensate can be discharged normally even during the initial start-up of the warm air furnace when the water seal structure 1 has not been pre-filled with sufficient water for sealing. Therefore, it is not necessary to manually add water to the water seal structure 1 in advance, eliminating the need for manual pre-filling. When water is added to the water seal structure 1, or when condensate is discharged into the water seal structure 1 through drain pipe 2, as... Figures 7 to 10 As shown, the weight of the water seal structure 1 itself plus the weight of the water will overcome the elastic force of the elastic element 3, causing the water seal structure 1 to move downward relative to the drain pipe 2, so that a gap is formed between the bottom end of the drain pipe 2 and the bottom plane 1011 of the connecting part 101. The condensate flows out of the drain pipe 2 and enters the drain part 102 through the bottom connecting pipe 103, forming a water seal in the drain part 102, which can effectively block the leakage of flue gas.

[0037] In one embodiment, the elastic member 3 is disposed between the connecting portion 101 and the first pipe section 201.

[0038] In this embodiment, the elastic element 3 is placed between the connecting part 101 and the first pipe section 201, which does not require external installation space and does not change the original overall layout structure of the drainage water seal assembly. At the same time, it can prevent the elastic element 3 from being exposed to oil, dust and condensate corrosion and aging, extend the service life of the elastic element 3, maintain the automatic sealing performance under waterless conditions for a long time, further reduce the probability of the heating furnace stopping malfunction, and improve the overall reliability and service life of the machine.

[0039] In an alternative embodiment, the elastic element 3 can be disposed between the top of the water collection tank 5 and the water seal structure 1. The elastic element 3 applies a pulling force to the water seal structure 1. When no water is placed in the water seal structure 1, the elastic force of the elastic element 3 causes the bottom plane 1011 of the connecting part 101 to abut against the bottom end of the first pipe section 201.

[0040] In another alternative embodiment, the elastic element 3 can be placed at the bottom of the water seal structure 1, and the other end of the elastic element 3 is fixed on the bracket below the water seal structure 1. The elastic element 3 applies an upward thrust to the water seal structure 1. When no water is placed in the water seal structure 1, the elastic force of the elastic element 3 causes the bottom plane 1011 of the connecting part 101 to abut against the bottom end of the first pipe section 201.

[0041] In one embodiment, such as Figure 1 , Figure 5 and Figure 6 As shown, the top of the connecting part 101 is provided with an inwardly extending first flange 1013, and a through opening 1012 is formed on the inner side of the first flange 1013. The first end of the elastic member 3 abuts against the first flange 1013.

[0042] In this embodiment, by providing an inwardly extending first flange 1013 at the top of the connecting part 101, and using the inner side of the first flange 1013 to form a through opening 1012, the first pipe segment 201 of the drain pipe 2 passing through can be radially limited and centrally guided, avoiding skewed assembly or eccentric offset of the first pipe segment 201, and ensuring the coaxial fit accuracy between the pipe segment and the connecting part 101. At the same time, the first end of the elastic member 3 is abutted and limited at the first flange 1013, and the flange structure of the first flange 1013 forms a reliable axial support point, providing a fixed force reference for the elastic member 3, preventing the elastic member 3 from slipping, shifting, or coming out of the assembly position during the pressure process, making the force on the elastic member 3 more uniform and stable, and being able to output an upward elastic force to the water seal structure 1 through the first flange 1013, so that when no water is placed in the water seal structure 1, the bottom plane 1011 of the connecting part 101 and the bottom end of the first pipe segment 201 are tightly fitted and sealed.

[0043] In one embodiment not shown in the figure, a boss may be provided on the side wall of the connecting part 101, the boss surrounds the first pipe section 201, and the first end of the elastic member 3 abuts against the boss.

[0044] In one embodiment, such as Figure 2 , Figure 5 and Figure 6 As shown, the first pipe section 201 has a second flange 202 extending outward at one end inside the connecting part 101. When no water is provided in the water seal structure 1, the elastic force of the elastic member 3 causes the second flange 202 to abut against the bottom plane 1011 of the connecting part 101.

[0045] In this embodiment, the first pipe section 201 has an outwardly extending second flange 202 at one end inside the connecting part 101. The second flange 202 forms an annular limiting support surface. When no water is placed in the water seal structure 1, the second flange 202 and the bottom plane 1011 of the connecting part 101 form a precise sealing mating end face, which can increase the effective sealing contact area, improve the fit and sealing performance, and avoid the problem of local gap leakage due to the narrow end face of the first pipe section 201 and the processing tolerance.

[0046] When no water is placed in the water seal structure 1, the elastic force of the elastic element 3 causes the second flange 202 to abut against the bottom plane 1011 of the connecting part 101, which can effectively block the backflow of outside air into the water collection tank 5 through the water seal structure 1, the drain pipe 2, and the drain port 501 of the water collection tank 5. This fundamentally avoids the problem of outside air blowing in through the drain port 501, causing condensate water to be unable to be discharged from the drain port 501 of the water collection tank 5, and the condensate water can be discharged normally.

[0047] In one embodiment, the second end of the elastic member 3 abuts against the second flange 202.

[0048] In this embodiment, the first end of the elastic element 3 abuts against the first flange 1013, and the second end abuts against the second flange 202. The first flange 1013 and the second flange 202 limit the two ends of the elastic element 3 and provide reliable force points, ensuring that the elastic element 3 will not undergo axial movement, radial displacement, or skew or twisting, and will always maintain a vertical and regular force state, with stable and controllable elastic deformation direction. At the same time, the first flange 1013 and the second flange 202 form a closed limiting protection for the elastic element 3, which can prevent condensate water, dust and impurities from adhering to the elastic element 3 and causing the impurities to cause jamming on the elastic element 3's rebound, and prevent condensate water from corroding the elastic element 3, thereby effectively extending the service life of the elastic element 3, maintaining stable elastic pre-tightening performance for a long time, continuously avoiding faults such as blocked condensate drainage, false detection of pressure taps, and false shutdown of the whole machine, and significantly improving the reliability of the gas central heating furnace during initial start-up and long-term operation.

[0049] In one embodiment, such as Figure 11 As shown, the top of the connecting part 101 is provided with an inwardly extending first flange 1013, and the inner side of the first flange 1013 forms a through opening 1012. The end of the first pipe section 201 located inside the connecting part 101 is provided with an outwardly extending second flange 202. A flexible sealing membrane 4 is provided between the first flange 1013 and the second flange 202. The flexible sealing membrane 4 surrounds the first pipe section 201, and the elastic element 3 is provided on the outside of the water seal structure 1.

[0050] In this embodiment, a flexible sealing membrane 4 is arranged around the first pipe segment 201 between the first flange 1013 and the second flange 202. This membrane can form an all-round seal in both the radial and circumferential directions over the assembly gap between the first pipe segment 201 and the connecting part 101, filling the tiny gaps caused by the assembly tolerances of the components. This prevents outside air from seeping into the water collection tank 5 through the pipe gaps, further improving the airtightness of the waterless state and preventing the inward airflow from hindering the normal discharge of condensate. Because the flexible sealing membrane 4 has deformable and adaptive properties, it can adapt to the eccentricity of the first pipe segment 201 during assembly, slight vibration displacement, and thermal expansion and contraction deformation. It always fits and covers the outer periphery of the pipe body, and will not produce air leakage gaps due to minor structural misalignments. It has strong sealing adaptability and high fault tolerance. The elastic element 3 is arranged on the outside of the water seal structure 1, forming a double protection layout with the internal flexible sealing membrane 4. The internal flexible sealing membrane 4 achieves airtight sealing of the gap, while the elastic element 3 provides overall pre-tightening force on the outside, ensuring that the second flange 202 and the bottom plane 1011 of the connecting part 101 remain pressed and fitted together under waterless conditions. The double seal works together to greatly improve the sealing reliability under waterless conditions. In addition, placing the elastic element 3 on the outside of the water seal structure 1 facilitates the disassembly, assembly, and maintenance of the elastic element 3.

[0051] In one embodiment, a first drain outlet 104 is provided on one side of the drainage section 102. The first drain outlet 104 is horizontally arranged, and the elastic member 3 is configured such that when the liquid level in the water seal structure 1 is not lower than the first drain outlet 104, the bottom end of the first pipe section 201 is not higher than the first drain outlet 104.

[0052] In this embodiment, a horizontally arranged first drain outlet 104 is provided on one side of the drainage section 102 to ensure that condensate can be discharged smoothly to the outside. At the same time, the horizontally arranged first drain outlet 104 facilitates the external pipeline. The elastic element 3 is configured such that when the liquid level in the water seal structure 1 is not lower than the first drain outlet 104, the bottom end of the first pipe section 201 is not higher than the first drain outlet 104. This ensures that the condensate can cover the bottom end of the first pipe section 201, forming a reliable water seal, blocking the flue gas, effectively preventing the combustion flue gas from leaking to the outside through the drain outlet 501, and at the same time preventing excess outside air from being sucked into the furnace by the fan from the drain outlet 501, reducing ineffective air intake loss, reducing the fan load, saving energy consumption, and ensuring the combustion efficiency of the hot air furnace and the working performance of the fan. When the liquid level in the water seal structure 1 reaches the height of the first drain port 104, the condensate in the water seal structure 1 will be discharged through the first drain port 104. This prevents condensate from accumulating in the water seal structure 1 and causing condensate to accumulate at the drain port 501 of the water collection tank 5. Therefore, it avoids the fault of the heater misjudging the drain port 501 as blocked due to condensate clogging the pressure tap and forcibly shutting down, ensuring continuous and stable operation of the whole machine. In addition, the water seal is ensured by the structure of the elastic element 3 itself, which is simple, compact and has few parts.

[0053] Specifically, when water is added to the water seal structure 1, or when condensate is discharged into the water seal structure 1 through the drain pipe 2, the weight of the water seal structure 1 itself plus the weight of the water will overcome the elastic force of the elastic element 3, causing the water seal structure 1 to move downward relative to the drain pipe 2, so that a gap is formed between the bottom end of the drain pipe 2 and the bottom plane 1011 of the connecting part 101. The condensate flows out of the drain pipe 2 and enters the drain part 102 through the bottom connecting pipe 103, forming a water seal in the drain part 102. During the design, the length of the first pipe section 201 and the material and size of the elastic element 3 can be adjusted to ensure that when the liquid level in the water seal structure 1 is not lower than the first drain outlet 104, the bottom end of the first pipe section 201 is not higher than the first drain outlet 104.

[0054] In one embodiment, the top of the drainage section 102 is provided with a second drainage port 105, and the bottom side of the drainage port 501 is provided with a third drainage port 106, and a plug 6 is detachably provided at the third drainage port 106.

[0055] In this embodiment, a second drain outlet 105 is provided at the top of the drainage section 102. When water needs to be added to the water seal structure 1, water can be added to the water seal structure 1 through the first drain outlet 104 to form a water seal. The second drain outlet 105 is located at the top of the drainage section 102 and can serve as an overflow protection port. When the condensate level inside the water seal structure 1 rises abnormally and exceeds the normal operating level, the excess condensate can overflow and be discharged in time from the top second drain outlet 105, preventing backflow into the water collection tank 5 and the furnace body due to excessive liquid level. This effectively prevents water from entering the furnace body, internal components from becoming damp and corroding, and improves the overall safety protection level of the machine. A third drain outlet 106 is provided on one side of the bottom of the drainage section 102, which is located at the lowest position of the drainage section 102. It can collect dirt, impurities, silt and residual water deposited at the bottom of the water seal structure 1. During normal operation, the plug 6 blocks the third drain outlet 106 to ensure that the water seal structure 1 can store water and form a water seal. When it is necessary to clean the dirt inside the water seal structure 1, the plug 6 can be removed to achieve thorough drainage at a low position, avoiding the long-term accumulation of impurities inside the water seal, which can cause pipe blockage, odor and breeding of dirt, and ensure that the drainage channel is unobstructed and clean for a long time.

[0056] In one embodiment, the drain pipe 2 further includes a connecting pipe section 203 located at the top of the first pipe section 201. The connecting pipe section 203 is adapted to be connected to the drain outlet 501 of the water collection tank 5 via an adapter. The outer diameter of the connecting pipe section 203 is larger than the outer diameter of the first pipe section 201.

[0057] In this embodiment, the drain pipe 2 also includes a connecting pipe section 203 located at the top of the first pipe section 201. The outer diameter of the connecting pipe section 203 is larger than the outer diameter of the first pipe section 201, which facilitates the fitting and connection of the connecting pipe section 203 with the adapter. Because the outer diameter of the connecting pipe section 203 is larger than the outer diameter of the first pipe section 201, the larger outer diameter of the connecting pipe section 203 allows the condensate to flow out of the water collection tank 5 more smoothly and steadily.

[0058] In one embodiment, when the bottom end of the first pipe segment 201 abuts against the bottom plane 1011 of the connecting portion 101, the connecting pipe segment 203 abuts against the top of the connecting portion 101. During assembly, the depth to which the drain pipe 2 extends into the connecting portion 101 can be limited. When the bottom end of the first pipe segment 201 abuts against the bottom plane 1011 of the connecting portion 101, the connecting pipe segment 203 abuts against the top of the connecting portion 101. The length of the first pipe segment 201 is adapted to the depth of the connecting portion 101, eliminating the need for the first pipe segment 201 to be excessively long and reducing unnecessary waste.

[0059] In one embodiment, such as Figure 12 As shown, there is no gap between the first pipe section 201 and the through port 1012.

[0060] In this embodiment, the first pipe section 201 and the through-hole 1012 are seamlessly connected, preventing outside air from seeping in and backflowing through the assembly gap between the through-hole 1012 and the first pipe section 201. This further enhances the overall airtightness and prevents airflow from entering the water collection tank 5 through gaps and creating an inward blowing force. Structurally, this eliminates the problem of condensate being unable to drain properly due to airflow obstruction. Furthermore, the seamless fit between the first pipe section 201 and the through-hole 1012 provides circumferential constraint and centering for the first pipe section 201, limiting radial displacement and eccentric tilt. This ensures that the first pipe section 201, the bottom plane 1011 of the connecting part 101, and the second flange 202 remain coaxially aligned, resulting in a uniform circumferential distribution of the preload of the elastic element 3 and balanced sealing force. This prevents localized air leakage and seal failure due to pipe misalignment. In addition, it can prevent dust, condensation scale, and small impurities from entering the interior of the water seal structure 1 through the gap, avoid impurities from getting stuck in the elastic element 3, the sealing mating surface and the drainage channel, reduce the risk of pipe scaling and blockage, maintain the smooth drainage channel and the working accuracy of the sealing structure for a long time, and stably avoid the phenomenon of pressure tap blockage and the furnace misjudging drainage failure and shutting down.

[0061] Specifically, the gapless setting between the first pipe section 201 and the through port 1012 is achieved by adjusting the fit tolerance and roughness between the through port 1012 and the first pipe.

[0062] According to an embodiment of the present invention, another aspect provides a warm air furnace, including a water collection tank 5 and a drainage water seal assembly provided in the above embodiment. The water collection tank 5 is provided with a drain outlet 501 and a first pressure tap 502, the first pressure tap 502 being adjacent to the drain outlet 501; a drain pipe 2 is connected to the drain outlet 501.

[0063] This heater, through the cooperation of a water seal structure 1, a drain pipe 2, and an elastic element 3, effectively prevents outside air from flowing back into the water collection tank 5 through the drain outlet 501 of the water seal structure 1 and before sufficient water is added to the water seal structure 1 for sealing. This is achieved by the elastic force of the elastic element 3 causing the bottom plane 1011 of the connecting part 101 to abut against the bottom end of the first pipe section 201 during the initial start-up of the heater and before sufficient water is added to the water seal structure 1, the drain pipe 2, and the drain outlet 501 of the water collection tank 5. This fundamentally prevents outside air from blowing in through the drain outlet 501, thus avoiding the accumulation of condensate. The condensate can be discharged normally from the drain outlet 501 of the water collection tank 5, preventing excessive condensate from accumulating at the drain outlet 501 and clogging the first pressure tap 502 near the drain outlet 501. This avoids signal distortion at the first pressure tap 502 due to water accumulation, effectively solving the problem of the central heating furnace misjudging the drain outlet 501 as blocked and causing the entire unit to shut down. This ensures the stability of the gas central heating furnace during initial startup and normal operation, significantly improving the user experience. Through the cooperation of the water seal structure 1, drain pipe 2, and elastic element 3, condensate can be discharged normally even during the initial startup of the heating furnace when the water seal structure 1 has not been pre-filled with sufficient water for sealing. Therefore, there is no need to manually add water to the water seal structure 1 in advance, eliminating the need for manual pre-filling of water. When water is added to the water seal structure 1, or when condensate is discharged into the water seal structure 1 through the drain pipe 2, the weight of the water seal structure 1 itself plus the weight of the water will overcome the elastic force of the elastic element 3, causing the water seal structure 1 to move downward relative to the drain pipe 2, so that a gap is formed between the bottom end of the drain pipe 2 and the bottom plane 1011 of the connecting part 101. The condensate flows out of the drain pipe 2 and enters the drainage part 102 through the bottom connecting pipe 103, forming a water seal in the drainage part 102, which can effectively prevent flue gas leakage.

[0064] Specifically in one embodiment, such as Figure 14 As shown, the water collection tank 5 has two drain outlets 501, and the drain pipe 2 is connected to one of the drain outlets 501 via an adapter. The water collection tank 5 has two drain outlets 501, allowing the drain pipe 2 to be connected to one of them via the adapter. This allows for flexible selection of the connection position based on the internal piping layout and installation space, adapting to the assembly and layout requirements of different models and internal structures, resulting in stronger layout adaptability and overall versatility. Furthermore, the two drain outlets 501 can be used in one location and kept as a backup, facilitating future pipe maintenance and switching, and reducing the risk of a single-diameter outlet blockage causing complete drainage failure.

[0065] Continue to refer to Figure 14 The water collection tank 5 is also provided with an exhaust fan inlet 503 and a second pressure tap 504. The second pressure tap 504 is located near the top of the water collection tank 5 and is diagonally opposite to the first pressure tap 502.

[0066] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A drainage water seal assembly, characterized in that, include: The water seal structure (1) includes a connecting part (101) and a drain part (102). The connecting part (101) and the drain part (102) are connected by a bottom connecting pipe (103). The connecting part (101) and the drain part (102) extend upward respectively. The top of the connecting part (101) is provided with a through opening (1012). A drain pipe (2) is adapted to communicate with the drain outlet (501) of the water collection tank (5) of the hot air furnace, the drain pipe (2) including a first pipe section (201) passing through the through-hole (1012). The elastic element (3) acts on the water seal structure (1). When no water is provided in the water seal structure (1), the elastic force of the elastic element (3) causes the bottom plane (1011) of the connecting part (101) to abut against the bottom end of the first pipe section (201).

2. The drainage water seal assembly according to claim 1, characterized in that, The elastic element (3) is disposed between the connecting part (101) and the first pipe section (201).

3. The drainage water seal assembly according to claim 1, characterized in that, The top of the connecting part (101) is provided with an inwardly extending first flange (1013), and the through opening (1012) is formed on the inner side of the first flange (1013). The first end of the elastic member (3) abuts against the first flange (1013).

4. The drainage water seal assembly according to claim 1, characterized in that, The first pipe section (201) has a second flange (202) extending outward at one end inside the connecting part (101). When no water is placed in the water seal structure (1), the elastic force of the elastic member (3) causes the second flange (202) to abut against the bottom plane (1011) of the connecting part (101).

5. The drainage water seal assembly according to claim 4, characterized in that, The second end of the elastic element (3) abuts against the second flange (202).

6. The drainage water seal assembly according to claim 1, characterized in that, The top end of the connecting part (101) is provided with an inwardly extending first flange (1013), and the through opening (1012) is formed on the inner side of the first flange (1013). The first pipe segment (201) located inside the connecting part (101) is provided with an outwardly extending second flange (202). A flexible sealing membrane (4) is provided between the first flange (1013) and the second flange (202). The flexible sealing membrane (4) surrounds the first pipe segment (201). The elastic element (3) is provided on the outside of the water seal structure (1).

7. The drainage water seal assembly according to any one of claims 1 to 6, characterized in that, The drainage section (102) has a first drain outlet (104) on one side. The first drain outlet (104) is horizontally arranged. The elastic element (3) is configured such that when the liquid level in the water seal structure (1) is not lower than the first drain outlet (104), the bottom end of the first pipe section (201) is not higher than the first drain outlet (104).

8. The drainage water seal assembly according to claim 7, characterized in that, The top of the drainage section (102) is provided with a second drainage port (105), and the bottom side of the drainage port (501) is provided with a third drainage port (106). A plug (6) is detachably provided at the third drainage port (106).

9. The drainage water seal assembly according to any one of claims 1 to 6, characterized in that, The drain pipe (2) also includes a connecting pipe section (203) located at the top of the first pipe section (201), the connecting pipe section (203) being adapted to be connected to the drain outlet (501) of the water collection tank (5) via an adapter, and the outer diameter of the connecting pipe section (203) being larger than the outer diameter of the first pipe section (201).

10. The drainage water seal assembly according to any one of claims 1 to 6, characterized in that, There is no gap between the first pipe section (201) and the through port (1012).

11. A type of heater, characterized in that, include: The water collection tank (5) is provided with a drain outlet (501) and a first pressure tap (502), the first pressure tap (502) being adjacent to the drain outlet (501); The drainage water seal assembly according to any one of claims 1 to 10, wherein the drainage pipe (2) is connected to the drainage outlet (501).

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