Heater intake and exhaust device for a wagon
By integrating the intake and exhaust structure and condensate discharge channel, the problems of flue gas backflow and condensate accumulation in the parking heater of station wagons are solved, improving the vehicle body sealing and combustion efficiency, and ensuring the stable operation of the heater.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HARBIN HAOKE SCI & TECH CO LTD
- Filing Date
- 2026-06-17
- Publication Date
- 2026-07-24
AI Technical Summary
The existing parking heaters for station wagons mostly have separate intake and exhaust structures, which results in multiple openings that compromise the vehicle's sealing and aesthetics. They also cause problems such as flue gas backflow and condensate accumulation that corrodes the pipes, affecting the heater's operational stability and safety.
It adopts an integrated intake and exhaust pipeline, and divides the smoke and intake space by a ring-shaped fixed plate and baffle. It uses high-temperature smoke to form negative pressure to draw in fresh air, and is equipped with a condensate discharge channel to prevent smoke backflow and water accumulation.
It achieves vehicle body sealing and appearance integrity, prevents flue gas backflow, improves combustion efficiency, reduces fuel consumption, reduces water corrosion, and enhances the working stability and safety of the heater.
Smart Images
Figure CN122447178A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of supporting accessories for motorhome parking heaters, specifically relating to an integrated air intake and exhaust device that integrates functions such as air intake, smoke exhaust, air intake preheating, condensate discharge, and automatic negative pressure suction of smoke intake. Background Technology
[0002] With the rapid development of the leisure travel industry, the market share of self-propelled motorhomes, towed caravans, and off-road modified travel vehicles has been increasing year by year. Parking heaters are the core equipment for winter heating and onboard hot water supply in travel vehicles. When the parking heater is working, it needs to exhaust the high-temperature flue gas produced by fuel combustion while continuously drawing in fresh air from outside the vehicle to provide oxygen for fuel combustion in the combustion chamber. Therefore, it is necessary to install an intake and exhaust end structure on the vehicle that connects the heater to the outside atmosphere.
[0003] Currently, most parking heaters for station wagons on the market use a split intake and exhaust structure, with the intake and exhaust interfaces being independent, requiring two separate openings on the vehicle. Multiple openings not only compromise the original vehicle's sealing performance, increasing the risk of water and air leaks, but also affect the overall aesthetics of the vehicle. Meanwhile, the few existing integrated intake and exhaust systems on the market lack a reasonable partitioning structure for the intake and exhaust spaces, allowing high-temperature flue gas to easily enter the intake channel, causing flue gas backflow problems, resulting in low intake supply efficiency and unstable combustion conditions, further affecting the heater's operation and limiting its practicality.
[0004] In addition, traditional intake and exhaust structures do not have a dedicated condensate drainage structure. When the heater is working, the high-temperature flue gas inside the exhaust pipe will form condensate when it comes into contact with the low-temperature outside air. The condensate is easy to accumulate inside the pipe. Long-term retention of condensate will corrode the metal pipe and may even backflow into the combustion chamber of the heater, causing abnormal combustion and equipment corrosion damage. Summary of the Invention
[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a heater intake and exhaust device for touring vehicles. This invention integrates intake and exhaust pipes in one unit, requiring only one installation hole in the vehicle body, thus balancing vehicle sealing and overall appearance integrity. The internal space of the cover is partitioned to physically separate exhaust gas and intake air, effectively preventing backflow of exhaust gas. High-temperature exhaust gas rises and creates negative pressure to automatically draw in fresh air, while the high-temperature exhaust pipe wall preheats the interlayer intake air, improving low-temperature combustion conditions. An independent condensate drainage channel collects and drains condensate from the pipes, preventing pipe corrosion and water backflow.The technical solution of the present invention is: a heating intake and exhaust device for a travel vehicle, comprising: an exhaust pipe (1), an intake pipe (2), a positioning frame (3), and a cover (4), wherein the exhaust pipe (1) passes through the intake pipe (2), and an annular intake channel is formed between the outer wall of the exhaust pipe (1) and the inner wall of the intake pipe (2), the positioning frame (3) is coaxially sleeved on the outside of the intake pipe (2), and the cover (4) is installed on the outside of the positioning frame (3), a first sealing gasket (31) is sandwiched between the front end face of the positioning frame (3) and the outer surface of the vehicle body, and a second sealing gasket (32) is sandwiched between the rear end face of the positioning frame (3) and the inner end face of the cover (4), and the cover ( 4) A second air inlet (41) is provided at the bottom end, and multiple louvered second smoke exhaust outlets (42) are provided on the upper part of the side wall of the cover (4); an annular fixing plate (5) is provided between the smoke exhaust pipe (1) and the air inlet pipe (2) and faces the cover (4) side, wherein the outer side of the annular fixing plate (5) is attached to the inner wall of the air inlet pipe (2), and the inner side of the annular fixing plate (5) is attached to the outer wall of the smoke exhaust pipe (1). A smoke exhaust gap is left between the top of the annular fixing plate (5) and the inner surface of the cover (4), and the bottom of the annular fixing plate (5) abuts against the inner surface of the cover (4); the smoke exhaust pipe (1) passes through the annular fixing plate (5) and extends into Inside the cover (4), the inner cavity of the exhaust pipe (1) is provided with a first baffle (6), the edge of the first baffle (6) is in contact with the inner wall of the exhaust pipe (1), a first exhaust port (61) is opened between the first baffle (6) and the top of the exhaust pipe (1), and a drain port (62) is opened between the first baffle (6) and the bottom of the exhaust pipe (1). The opening area of the first exhaust port (61) at the top is larger than the opening area of the drain port (62) at the bottom. A second baffle (7) is fixedly connected to the side of the first baffle (6) facing the cover (4); the second baffle (7) extends outward, and its extension edge facing the side of the first baffle (6) is connected to the annular fixing plate ( 5) The remaining extended edges are fitted to the inner wall of the cover (4), dividing the inner space of the cover (4) into two areas, the upper part connecting the smoke exhaust gap and the second smoke exhaust port (42), and the lower part connecting the air intake passage; the bottom end of the air intake pipe (2) extending into the cover (4) is provided with a first air intake port (21), and the second air intake port (41) and the first air intake port (21) are connected in sequence to form an air intake passage; the air intake pipe (2) extending into the cover (4) and the inner wall of the cover (4) enclose to form an annular drainage groove (8), and the annular drainage groove (8) is connected to the drain port (62) and the second air intake port (41) respectively.
[0006] Multiple second smoke vents (42) are louvered openings with their openings tilted downwards; all second smoke vents (42) are located in the smoke vent gap between the top of the annular fixing plate (5) and the inner surface of the cover (4), and are evenly arranged along the side wall of the cover (4).
[0007] The first baffle (6) in the inner cavity of the exhaust pipe (1) and the first exhaust port (61) on its top are arranged facing the second exhaust port (42); the second baffle (7) is attached to the extended edge of the inner wall of the cover (4) and is arranged at an angle below the second exhaust port (42) to form a baffle, thereby dividing the inside of the cover (4) into an air intake area and an exhaust area. The high temperature flue gas rises and is discharged through the second exhaust port (42) to form a negative pressure around the perimeter, and the air intake passage actively draws in outside air.
[0008] The exhaust pipe (1) is inclined in the inner cavity of the air inlet pipe (2). The end of the exhaust pipe (1) near the cover (4) is lower than the end away from the cover (4). The inclined exhaust pipe (1) allows the condensate to flow and collect to the drain outlet (62).
[0009] The outer wall of the exhaust pipe (1) and the inner wall of the air inlet pipe (2) form an annular air inlet channel, which can be used to preheat the air inlet by utilizing the high temperature of the exhaust pipe (1).
[0010] The positioning frame (3) is a ring structure and is coaxially sleeved and fixed on the outside of the air intake pipe (2). The positioning frame (3) is located on the rear side of the first air intake (21) along the axial direction of the air intake pipe (2).
[0011] The positioning frame (3) is an annular flange structure. Several mounting through holes are provided on the ring body of both the positioning frame (3) and the cover (4). The cover (4) is installed on the outside of the positioning frame (3). The screw passes through the cover (4), the second sealing gasket (32) on the rear end face of the positioning frame (3), the positioning frame (3) body and the first sealing gasket (31) on the front end face of the positioning frame (3) in sequence, and fastens the positioning frame (3) to the vehicle body surface. The first sealing gasket (31) and the second sealing gasket (32) are respectively sealed and attached to the corresponding mounting contact surfaces.
[0012] Working principle of the invention:
[0013] The parking heater's intake and exhaust system uses an annular fixing plate (5) between the exhaust pipe (1) and the intake pipe (2) to separate the two pipe cavities. A first baffle (6) inside the exhaust pipe (1) and a second baffle (7) extending into the cover (4) and onto the annular fixing plate (5) divide the interior space of the cover (4) into an intake area and an exhaust area. High-temperature flue gas moves in the upper area, while fresh air is delivered to the lower area. After the parking heater starts working, the high-temperature flue gas generated by combustion is delivered from inside the heater to the exhaust pipe (1). The high-temperature flue gas flows from the exhaust pipe (1) to one side of the cover (4), passes through the first exhaust port (61) above the first baffle (6), and enters the exhaust gap at the top of the cover (4). The high-temperature flue gas has a high temperature and lower gas density, and under the action of buoyancy, it continues to flow upwards, passing through the exhaust gap at the top of the annular fixing plate (5), and finally exits to the outside atmosphere from the second exhaust port (42) on the upper side wall of the cover (4).
[0014] The high-temperature flue gas that flows out continuously at high speed forms a local negative pressure at the second exhaust port (42). The negative pressure will actively draw in fresh air outside the cover (4). The outside air enters the air intake passage formed by the second air intake port (41) and the first air intake port (21) connected in sequence from the bottom of the cover (4) and is then transported to the annular air intake passage between the exhaust pipe (1) and the air intake pipe (2), and finally transported to the heater combustion chamber along the pipeline.
[0015] High-temperature flue gas continuously flows through the exhaust pipe (1), keeping the pipe wall of the exhaust pipe (1) at a high temperature for a long time; cold air flows in the annular air intake channel and adheres closely to the outer wall of the exhaust pipe (1), and heat exchange occurs between the two, with the cold air being preheated by the pipe wall. The preheated air is sent into the combustion chamber, where fuel combustion is more complete under low-temperature conditions, reducing fuel loss and exhaust pollution.
[0016] During the operation of the heater, the high-temperature flue gas inside the exhaust pipe (1) comes into contact with the low-temperature environment outside, which will generate a large amount of condensate. Due to the inclined arrangement of the exhaust pipe (1), the condensate relies on its own weight to collect along the pipe wall to the drain outlet (62) below the first baffle (6). The condensate flows through the drain outlet (62) into the annular drainage trough (8) and is finally discharged from the outside of the device through the second air inlet (41). If rainwater flows back into the exhaust pipe (1) through the second exhaust outlet (42), the rainwater will also be collected in the annular drainage trough (8) and discharged in a unified manner to avoid water accumulation.
[0017] Technical effects of the invention:
[0018] The present invention has the following beneficial effects:
[0019] 1. The present invention adopts the exhaust pipe (1) integrated inside the intake pipe (2), and the whole is an integrated structure. Only one mounting hole needs to be opened on the body sheet metal. Compared with the traditional split double opening structure, the integrity of the original vehicle is preserved to the greatest extent, which avoids multiple openings that damage the original appearance of the vehicle and reduces the risk of water leakage and air leakage.
[0020] 2. The present invention divides the interior of the cover (4) into upper and lower sections by means of an annular fixing plate (5), a first baffle (6) and a second baffle (7), distinguishing the flue gas flow space and the air intake flow space. High-temperature flue gas moves in the upper area and fresh air is transported in the lower area, which effectively prevents flue gas backflow, ensures sufficient oxygen in the combustion chamber, more complete fuel combustion, improves thermal efficiency, and reduces fuel loss and exhaust pollution.
[0021] 3. The first baffle (6) receives rainwater splashed in from the second exhaust port (42). The rainwater flows into the annular drainage channel (8) from the drain (62), and the accumulated water is discharged directly through the second air intake (41). With the louvered second exhaust port (42) facing downwards, the backflow of rainwater is reduced from the source. At the same time, the double sealing pads on both sides of the positioning frame (3) press the body and the cover (4) tightly, which can effectively prevent rainwater from seeping into the vehicle.
[0022] 4. The exhaust pipe (1) is installed at an angle inside the air inlet pipe (2). The end of the exhaust pipe (1) near the cover (4) is lower than the end away from the cover (4). This method is conducive to the smooth discharge of condensate generated by the high temperature flue gas in the exhaust pipe (1) through the bottom drain outlet (62). At the same time, rainwater that flows back into the exhaust pipe (1) from the outside is discharged through the annular drainage channel (8), which effectively avoids water accumulation, pipe corrosion and water backflow problems.
[0023] 5. When the heater is working, the exhaust pipe (1) discharges high-temperature flue gas. The flue gas has a high temperature and low density, and naturally flows upward and is discharged from the upper second exhaust port (42). The high-speed flowing hot flue gas forms a local negative pressure at the exhaust port and automatically draws in fresh air from the outside into the lower air intake area. It relies on fluid dynamics to achieve autonomous air replenishment, reduce energy consumption, and simplify the heater structure.
[0024] 6. During the operation of the heater, high-temperature flue gas continuously flows through the exhaust pipe (1), causing the entire wall of the exhaust pipe (1) to heat up. Fresh air flowing through the annular intake channel between the exhaust pipe (1) and the intake pipe (2) can be preheated by the pipe wall. The preheated air in the low-temperature environment is sent into the heater combustion chamber, and the fuel mixes with the high-temperature air for more complete combustion, reducing fuel consumption and reducing exhaust gas generated by incomplete combustion. At the same time, it avoids the problem of equipment start-up and shutdown jamming and unstable combustion caused by cold air directly entering the combustion chamber, thus improving the stability of the parking heater in the cold season.
[0025] 7. The entire pipeline, partition baffle, and drainage structure are integrated into one unit, with a compact size to fit the narrow installation space on the outside of the travel vehicle; the number of parts is small, and the disassembly, cleaning, and maintenance are simple, making it compatible with parking heaters for various types of motorhomes and converted RVs. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the overall assembly cross-sectional structure of the present invention;
[0027] Reference numerals: 1-exhaust pipe, 2-inlet pipe, 3-positioning bracket, 31-first sealing gasket, 32-second sealing gasket, 4-protective cover, 41-second air inlet, 42-second exhaust outlet, 5-annular fixing plate, 6-first baffle, 61-first exhaust outlet, 62-drain outlet, 7-second baffle, 8-annular drainage groove.
[0028] Book Figure 1 The complete assembly structure of all parts of the device is shown. When the device is working, the high-temperature flue gas flows along the inclined exhaust pipe 1 to the upper area of the cover 4, and is discharged through the side wall exhaust port 42, forming a negative pressure to draw in the outside air. The outside cold air enters the lower air intake area through the bottom air inlet 41 of the cover 4, and is preheated by the high-temperature pipe wall as it flows through the annular channel between the exhaust pipe 1 and the air inlet pipe 2. The condensate in the exhaust pipe 1 is collected along the inclined pipe wall to the bottom drain port 62, flows into the annular drain trough 8 and is discharged outward. The second baffle 7 divides the inner cavity of the cover into upper and lower areas, effectively preventing the backflow of flue gas. Detailed Implementation
[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solutions of the present invention, and detailed implementation methods and operation procedures are given. However, the scope of protection of the present invention is not limited to the following embodiments.
[0030] See Figure 1 A heating intake and exhaust device for a travel vehicle includes: an exhaust pipe 1, an intake pipe 2, an annular flange structure positioning frame 3, and a cylindrical cover 4; the exhaust pipe 1 passes through the inside of the intake pipe 2, and the outer wall of the exhaust pipe 1 and the inner wall of the intake pipe 2 form an annular intake channel; the exhaust pipe 1 is inclined in the inner cavity of the intake pipe 2, and the end of the exhaust pipe 1 near the cover 4 is lower than the end away from the cover 4, so as to facilitate the gravity flow and collection of condensate.
[0031] The positioning bracket 3 is coaxially sleeved and fixed on the outside of the intake pipe 2, and is arranged axially along the intake pipe 2 behind the first air intake 21. The front end face of the positioning bracket 3 is in contact with the outer surface of the body sheet metal, and a ring-shaped first sealing gasket 31 is sandwiched between the two. A second sealing gasket 32 is sandwiched between the rear end face of the positioning bracket 3 and the left flange face of the cover 4. Several mounting through holes are opened in the ring of the positioning bracket 3 and the cover 4. The locking screw passes through the cover 4, the second sealing gasket 32, the positioning bracket 3, and the first sealing gasket 31 in sequence to fasten the entire device to the outer wall of the body. The double-layer sealing gasket seals all assembly gaps. The cover 4 is installed on the outside of the positioning bracket 3. A second air intake 41 is opened at the bottom of the cover 4. Multiple downwardly inclined louvered second exhaust ports 42 are evenly arranged on the upper part of the side wall of the cover 4. An annular fixing plate 5 is fixedly installed between the exhaust pipe 1 and the air inlet pipe 2 on the side facing the cover 4. The outer ring of the annular fixing plate 5 is sealed and fitted with the inner wall of the air inlet pipe 2, and the inner ring is sealed and fitted with the outer wall of the exhaust pipe 1. A hollow exhaust gap is reserved between the top of the annular fixing plate 5 and the inner top wall of the cover 4. All the second exhaust ports 42 are set within the exhaust gap. The bottom of the annular fixing plate 5 abuts against the inner bottom wall of the cover 4.
[0032] The right end of the exhaust pipe 1 extends through the annular fixing plate 5 and into the cavity of the cover 4. The first baffle 6 is welded and fixed to the inner cavity of the right end of the exhaust pipe 1. The edge of the first baffle 6 is sealed and fitted to the inner wall of the exhaust pipe 1. A first exhaust port 61 is opened on the upper part of the first baffle 6. The first exhaust port 61 is arranged facing the second exhaust port 42 on the side wall of the cover 4. A small drain port 62 is opened on the lower part of the first baffle 6. The opening area of the first exhaust port 61 is significantly larger than that of the drain port 62 to ensure priority flow of flue gas.
[0033] The first baffle 6 is fixedly connected to the second baffle 7 on the side facing the inner cavity of the cover 4; the second baffle 7 extends into the cavity of the cover 4, and its extended side facing the first baffle 6 is in contact with the annular fixing plate 5, and the remaining extended side is in contact with the inner cavity wall of the cover 4; the extended side of the second baffle 7 that is in contact with the inner cavity wall of the cover 4 is inclinedly arranged below the second smoke exhaust port 42 to form a baffle. The second baffle 7 divides the inner cavity of the cover 4 into two areas, the upper area is connected to the top smoke exhaust gap and the second smoke exhaust port 42 as a smoke exhaust area, and the lower area is connected to the first air inlet 21 and the second air inlet 41 as an air intake area.
[0034] The bottom end of the air intake pipe 2, which extends into the cover 4, has a first air intake port 21. The first air intake port 21 is connected to the second air intake port 41 at the bottom of the cover 4, forming a complete air intake passage. The outer wall of the lower half of the air intake pipe 2 and the inner wall of the lower half of the cover 4 together form an annular drainage groove 8. The annular drainage groove 8 is connected to the drain port 62 and the second air intake port 41, respectively. Condensate and rainwater can be discharged outward along the drainage groove.
Claims
1. A heater intake and exhaust device for a passenger car, characterized in that it comprises: The exhaust pipe (1), intake pipe (2), positioning frame (3), and cover (4) are provided. The exhaust pipe (1) passes through the intake pipe (2), and an annular intake channel is formed between the outer wall of the exhaust pipe (1) and the inner wall of the intake pipe (2). The positioning frame (3) is coaxially sleeved on the outside of the intake pipe (2). The cover (4) is installed on the outside of the positioning frame (3). A first sealing gasket (31) is sandwiched between the front end face of the positioning frame (3) and the outer surface of the vehicle body. A second sealing gasket (32) is sandwiched between the rear end face of the positioning frame (3) and the inner end face of the cover (4). A second air inlet (41) is opened at the bottom of the cover (4). 4) Multiple louvered second smoke vents (42) are provided on the upper part of the side wall; an annular fixing plate (5) is provided between the smoke vent (1) and the air inlet pipe (2) and faces the cover (4), wherein the outer side of the annular fixing plate (5) is attached to the inner wall of the air inlet pipe (2), the inner side of the annular fixing plate (5) is attached to the outer wall of the smoke vent (1), a smoke venting gap is left between the top of the annular fixing plate (5) and the inner surface of the cover (4), and the bottom of the annular fixing plate (5) abuts against the inner surface of the cover (4); the smoke vent (1) passes through the annular fixing plate (5) and extends into the cover (4), the smoke vent (1) The inner cavity is provided with a first baffle (6), the edge of the first baffle (6) is in contact with the inner wall of the exhaust pipe (1), a first exhaust port (61) is opened between the first baffle (6) and the top of the exhaust pipe (1), and a drain port (62) is opened between the first baffle (6) and the bottom of the exhaust pipe (1). The opening area of the first exhaust port (61) at the top is larger than the opening area of the drain port (62) at the bottom. A second baffle (7) is fixedly connected to the side of the first baffle (6) facing the cover (4); the second baffle (7) extends outward, and its extended edge facing the side of the first baffle (6) is in contact with the annular fixing plate (5). The remaining extended edges fit into the inner wall of the cover (4), dividing the inner space of the cover (4) into two areas, the upper part connecting the smoke exhaust gap and the second smoke exhaust port (42), and the lower part connecting the air intake passage; the bottom end of the air intake pipe (2) extending into the cover (4) is provided with a first air intake port (21), and the second air intake port (41) and the first air intake port (21) are connected in sequence to form an air intake passage; the air intake pipe (2) extending into the cover (4) and the inner wall of the cover (4) enclose to form an annular drainage groove (8), and the annular drainage groove (8) is connected to the drain port (62) and the second air intake port (41) respectively.
2. The intake and exhaust device for a heater in a passenger car according to claim 1, characterized in that: Multiple second smoke vents (42) are louvered openings with their openings tilted downwards; all second smoke vents (42) are located in the smoke vent gap between the top of the annular fixing plate (5) and the inner surface of the cover (4), and are evenly arranged along the side wall of the cover (4).
3. The intake and exhaust device for a heater in a passenger car according to claim 1, characterized in that: The first baffle (6) in the inner cavity of the exhaust pipe (1) and the first exhaust port (61) on its top are arranged facing the second exhaust port (42); the second baffle (7) is attached to the extended edge of the inner wall of the cover (4) and is arranged at an angle below the second exhaust port (42) to form a baffle, thereby dividing the inside of the cover (4) into an air intake area and an exhaust area. The high temperature flue gas rises and is discharged through the second exhaust port (42) to form a negative pressure around the perimeter, and the air intake passage actively draws in outside air.
4. The intake and exhaust device for a heater in a passenger car according to claim 1, characterized in that: The exhaust pipe (1) is inclined in the inner cavity of the air inlet pipe (2). The end of the exhaust pipe (1) near the cover (4) is lower than the end away from the cover (4). The inclined exhaust pipe (1) allows the condensate to flow and collect to the drain outlet (62).
5. The intake and exhaust device for a heater in a passenger car according to claim 1, characterized in that: The outer wall of the exhaust pipe (1) and the inner wall of the air inlet pipe (2) form an annular air inlet channel, which can be used to preheat the air inlet by utilizing the high temperature of the exhaust pipe (1).
6. The intake and exhaust device for a heater in a passenger car according to claim 1, characterized in that: The positioning frame (3) is a ring structure and is coaxially sleeved and fixed on the outside of the air intake pipe (2). The positioning frame (3) is located on the rear side of the first air intake (21) along the axial direction of the air intake pipe (2).
7. The intake and exhaust device for a heater in a passenger car according to claim 1, characterized in that: The positioning frame (3) is an annular flange structure. Several mounting through holes are provided on the ring body of both the positioning frame (3) and the cover (4). The cover (4) is installed on the outside of the positioning frame (3). The screw passes through the cover (4), the second sealing gasket (32) on the rear end face of the positioning frame (3), the positioning frame (3) body and the first sealing gasket (31) on the front end face of the positioning frame (3) in sequence, and fastens the positioning frame (3) to the vehicle body surface. The first sealing gasket (31) and the second sealing gasket (32) are respectively sealed and attached to the corresponding mounting contact surfaces.