Fireplace air exchange system

Abstract

The present invention discloses an air flow exchange system for a fireplace, the technical solution of which includes a combustion chamber and an exhaust pipe, a fresh air pipe for blowing air is fitted on the back of the combustion chamber, a heat exchange chamber is installed on the top of the combustion chamber, and the outlet of the fresh air pipe is connected to the heat exchange chamber to achieve heating of the fresh air; the heat exchange chamber includes an air flow conversion cabin, a plurality of main heat conducting pipes and a plurality of auxiliary heat conducting pipes, the main heat conducting pipes are connected to the air flow conversion cabin and the combustion chamber, the auxiliary heat conducting pipes are connected to the air flow conversion cabin and the exhaust pipe, and the exhaust pipe is installed with an exhaust fan; the outlet of the fresh air pipe faces the main heat conducting pipe and the auxiliary heat conducting pipe to achieve heating of the fresh air, a gap is provided between the main heat conducting pipe and the auxiliary heat conducting pipe for circulation of the fresh air, and the auxiliary heat conducting pipe is used to reflux and heat the fresh air flow, so that the heat conduction of the exhaust gas is achieved for the purpose of secondary utilization, thereby improving the thermal energy utilization rate of the discharged exhaust gas and achieving the effect of energy saving and environmental protection.

Description

Technical Field

[0001] The present invention relates to a real fire fireplace, and more particularly to an airflow exchange system of a fireplace. Background Art

[0002] A real fire fireplace uses wood and fuel pellets to generate heat and transfer the heat into the room.

[0003] A Chinese patent application, CN2007201144301, has been filed for a closed fireplace. The patent's description states, "The exhaust duct continues to operate, discharging combustion exhaust gases outdoors. At this time, the hot air pipe at the outlet of the blowing duct is heated, and the blowing wheel 9 rotates, drawing in air. This air is first heated by contact with the outer wall of the exhaust duct and the front plate of the furnace, and then heated a second time by the inner wall of the hot air pipe. Finally, the air is discharged from the outlet of the blowing duct, raising the indoor air temperature."

[0004] In the above technical solution, the hot air in the hot air pipe is only used to heat the air flow to the blowing pipe once, and then discharged as exhaust gas. A large amount of heat energy is still retained in the exhaust gas. Such a direct exhaust design results in a large loss of heat energy and a low energy-saving effect. Summary of the Invention

[0005] The purpose of the present invention is to provide an air flow exchange system for a fireplace, which adopts a secondary heat conduction pipe to reflux and heat the fresh air flow, so that the heat conduction of the exhaust gas can be reused for a second time, thereby improving the thermal energy utilization rate of the exhausted exhaust gas and achieving energy-saving and environmental protection effects.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A fireplace airflow exchange system includes a combustion chamber and an exhaust pipe. A fresh air pipe for blowing air is mounted on the back of the combustion chamber, and a heat exchange chamber is mounted on the top of the combustion chamber. The heat exchange chamber includes an airflow conversion cabin, a plurality of main heat conducting pipes, and a plurality of auxiliary heat conducting pipes. The main heat conducting pipes connect the airflow conversion cabin and the combustion chamber, the auxiliary heat conducting pipes connect the airflow conversion cabin and the exhaust pipe, and the exhaust pipe is mounted with an exhaust fan. The outlet of the fresh air pipe faces the main heat conducting pipe and the auxiliary heat conducting pipe to achieve fresh air heating, and a gap is provided between the main heat conducting pipe and the auxiliary heat conducting pipe for fresh air circulation.

[0008] Preferably, the main heat conducting pipe and the auxiliary heat conducting pipe are equipped with a plurality of heat sinks, and the heat sinks are arranged along the length direction of the main heat conducting pipe and the auxiliary heat conducting pipe.

[0009] Preferably, the number of heat sinks is 4, and the spacing between adjacent heat sinks is the same.

[0010] Preferably, outlet branches are provided on both sides of the combustion chamber, the outlet branches are connected to the airflow conversion cabin and the exhaust pipe, and the secondary heat conduction pipe is connected to the outlet branches and the exhaust pipe in sequence.

[0011] Preferably, the air outlet branch pipe is arranged in close proximity to the fresh air duct.

[0012] Preferably, the main heat pipe is located in the middle of the airflow conversion cabin, and the auxiliary heat pipes are located on both sides of the main heat pipe. A partition plate is fixed in the airflow conversion cabin to separate the multiple main heat pipes, and the partition plate divides the airflow conversion cabin into two cabins.

[0013] Preferably, the main heat pipe and the auxiliary heat pipe are equally divided into two compartments by a partition plate.

[0014] Preferably, an inclined plate is fixed to the upper end of the outlet branch pipe, and the inclined plate is located in the combustion chamber. The inclined plates on both sides are inclined toward the main heat pipe to guide the heat flow into the main heat pipe.

[0015] Preferably, the inclined plate is located at the boundary between the main heat conducting pipe and the auxiliary heat conducting pipe.

[0016] Preferably, the outlet of the fresh air duct is equipped with a diverter plate that divides the airflow into an upper airflow and a lower airflow, and the lower airflow is directed toward the main heat conducting pipe and the secondary heat conducting pipe; an upper warm air duct is arranged above the airflow conversion cabin, and the top plate of the airflow conversion cabin is the pipe wall of the upper warm air duct, one end of the upper warm air duct is connected to the upper airflow, and the other end of the upper warm air duct is located above the heat sink.

[0017] In summary, the present invention has the following beneficial effects:

[0018] (1) In this design, the hot air in the combustion chamber flows upward into the main air duct, then enters the secondary air duct through the air flow conversion cabin, and then the secondary air duct discharges the combustion exhaust gas outward through the exhaust pipe; the fresh air that needs to be heated flows through the outer walls of the main air duct and the secondary air duct to achieve heat exchange, so that the air flow temperature is increased, and the air flow flows indoors, accelerating the indoor temperature rise; the advantage of this design is that it utilizes the secondary heat source of the exhaust gas, because the exhaust gas has a higher temperature after the first heat exchange when flowing through the main heat pipe, and then undergoes a second heat exchange through the reflux of the secondary air duct, which improves the heat exchange efficiency of the exhaust gas and improves the energy utilization rate.

[0019] Furthermore, the airflow conversion cabin has a large amount of thermal energy. This design divides the fresh air flow into two parts, and passes the upper airflow through the top of the airflow conversion cabin to achieve heat exchange, completing the three-level exchange of thermal energy and greatly improving the thermal energy exchange efficiency.

[0020] (2) Multiple heat sinks are arranged on the main air duct and the auxiliary air duct to increase the efficiency of the fresh air heat exchange.

[0021] (3) In this design, the fresh air duct is located at the back of the combustion chamber, the heat exchange chamber is located at the top of the combustion chamber, and the two air outlet branches are located on both sides of the combustion chamber. This design makes the fireplace, except for the front window and the bottom with a perspective window, all other parts are covered by a layer of insulation. This design makes the sides, top and back of the fireplace equivalent to an insulation cabin, which can prevent heat energy from being directly dissipated through the outer wall of the fireplace, and is conducive to concentrating heat energy in the heat exchange chamber, so that the fresh air can be quickly heated up and diffused to the surrounding areas;

[0022] Secondly, the design of such an insulated cabin prevents the sides, top and back of the fireplace from becoming too hot, making it less likely for users to get burned if they accidentally touch them.

[0023] (4) The inclined plate of the bronchus plays a guiding role. Since the main bronchus and the auxiliary bronchus are densely arranged on the top of the combustion chamber, the design of the inclined plate can quickly guide the hot air flow in the combustion chamber to the main bronchus, and the exhaust gas flowing out of the auxiliary bronchus can also flow quickly into the exhaust pipe, which can accelerate heat exchange.

[0024] (5) The partition plate of the airflow conversion cabin stabilizes the exchange efficiency of the fresh air. The auxiliary air duct is located on both sides of the main air duct. The exhaust gas is divided into two streams through the partition plate, realizing two stable flowing annular air flows, so that the fresh air flowing through the radiator has similar temperatures on the left and right.

[0025] If there is no partition plate, the airflow in the airflow conversion cabin will fluctuate, resulting in unstable airflow in multiple secondary air ducts and uneven airflow temperature through the heat sink. The partition plate designed in this paper effectively solves this technical problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 2. It is a schematic diagram of the fireplace structure in the embodiment;

[0027] Figure 2 Schematic diagram of the positional relationship between the heat sink and the airflow conversion chamber in the fireplace in the embodiment;

[0028] Figure 3 Schematic diagram of the positional relationship between the blower, air inlet pipe, and exhaust pipe on the back of the fireplace in the embodiment;

[0029] Figure 4 Schematic diagram of the positional relationship between the fresh air duct, the airflow conversion cabin, and the heat sink in the embodiment;

[0030] Figure 5 Schematic diagram of the positional relationship of the partition plates after the airflow conversion cabin is opened in the embodiment;

[0031] Figure 6 Schematic diagram of hot air flow from the combustion chamber to the outlet branch pipe in the embodiment.

[0032] In the picture:

[0033] 1. Combustion chamber; 11. Air inlet pipe; 12. Back plate;

[0034] 2. Heat exchange chamber; 21. Airflow conversion chamber; 22. Partition plate; 23. Main heat pipe; 24. Secondary heat pipe;

[0035] 31. Fresh air duct; 32. Air blower;

[0036] 41. Exhaust pipe; 42. Exhaust fan;

[0037] 5. Outlet branch pipe; 51. Inclined plate;

[0038] 6. Heat sink;

[0039] 71. Diverter plate; 72. Upper warm air duct. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings.

[0041] Embodiment, an airflow exchange system of a fireplace, referring to Figure 1-Figure 3 The fireplace includes a combustion chamber 1 and an exhaust pipe 41. There is a transparent window in front of the combustion chamber 1. An airflow conversion cabin 21 is installed at the upper end of the combustion chamber 1. There is a heat sink 6 under the airflow conversion cabin 21. The airflow is heated by the heat sink 6 and then flows to the front of the fireplace.

[0042] A back plate 12 is fixed on the back of the combustion chamber 1, and the back plate 12 is a metal plate; an air inlet pipe is installed on the back of the combustion chamber 1, and the air inlet pipe 11 is at the bottom of the combustion chamber 1. Air is supplied to the combustion chamber 1 through the air inlet pipe 11 to retard the combustion. An exhaust pipe is installed on the back of the combustion chamber 1, and an exhaust fan 42 is installed on the exhaust pipe 41. The exhaust fan 42 draws out the combustion exhaust gas in the combustion chamber and discharges it to the outside through an external pipe.

[0043] Obviously, the air inlet pipe, the combustion chamber 1, and the exhaust pipe 41 form an air flow channel. This design mainly designs the air flow path from the combustion chamber 1 to the exhaust pipe 41 to improve the heat exchange efficiency between the exhaust gas and the fresh air. The specific structure is as follows.

[0044] Reference Figure 4 A fresh air pipe 31 for blowing air is installed on the back of the combustion chamber 1. The fresh air pipe 31 is a rectangular tube body that fits the back plate 12. An air blower 32 is installed under the fresh air pipe 31. The air blower 32 draws external air into and out of the fresh air pipe 31, and then flows out from the upper end of the fresh air pipe 31.

[0045] Reference Figure 4-Figure 6 A heat exchange chamber 2 is installed on the top of the combustion chamber 1, and the outlet of the fresh air pipe 31 is connected to the heat exchange chamber 2 to achieve heating of the fresh air;

[0046] A splitter plate 71 is installed at the outlet of the fresh air duct 31. The splitter plate 71 divides the airflow into an upper airflow and a lower airflow. The upper airflow and the lower airflow have the same flow direction, and the upper airflow is located above the lower airflow.

[0047] The outlet of the fresh air duct 31 is opened on the side of the vehicle, and the diverter plate 71 is an L-shaped plate. The diverter plate 71 is fixed to the outer wall of the airflow conversion cabin 21 at the outlet position;

[0048] The heat exchange chamber 2 includes an airflow conversion cabin 21, a plurality of main heat pipes 23, a plurality of secondary heat pipes 24 and a heat sink 6;

[0049] The lower airflow is directed toward the main heat pipe 23, the secondary heat pipe 24 and the heat sink 6; an upper warm air pipe 72 is provided above the airflow conversion cabin 21, and the upper warm air pipe 72 is connected to the outlet of the fresh air pipe 31, and the upper warm air pipe 72 is used to supply the upper airflow.

[0050] The top plate of the airflow conversion cabin 21 is the pipe wall of the upper warm air duct 72. The upper airflow can complete heat exchange when passing through the top plate of the airflow conversion cabin 21. There is a large amount of combustion exhaust gas inside the airflow conversion cabin 21. The temperature of the top plate of the airflow conversion cabin 21 is relatively high. The top plate of the airflow conversion cabin 21 is a metal plate; one end of the upper warm air duct 72 is connected to the upper airflow, and the other end of the upper warm air duct 72 is located above the heat sink 6, and the other end is also the air outlet end of the upper warm air duct 72.

[0051] The air outlet end of the upper warm air pipe 72 is located just above the heat sink 6, so the hot air flowing out of the upper warm air pipe 72 and the hot air flowing out between the heat sink 6 flow in the same direction; Figure 4 In the figure, the side of the air flow conversion cabin 21 facing the air outlet end of the upper warm air pipe 72 is a downward slope. This design allows the hot air flow of the upper warm air pipe 72 to flow downward, and the hot air flow of the upper warm air pipe 72 and the heat sink 6 are arranged in a close upper and lower manner.

[0052] In this design, there are 20 main heat pipes 23 and 12 auxiliary heat pipes 24. Along the outlet direction of the fresh air duct 31, the main heat pipes 23 and auxiliary heat pipes 24 are arranged in a staggered manner. This design ensures that the airflow blown out of the fresh air duct 31 can fully contact the main heat pipes 23 or auxiliary heat pipes 24.

[0053] The main heat pipe 23 and the auxiliary heat pipe 24 are metal round pipes, and both the main heat pipe 23 and the auxiliary heat pipe 24 are arranged vertically;

[0054] The main heat pipe 23 connects the airflow conversion chamber 21 and the combustion chamber 1, the auxiliary heat pipe 24 connects the airflow conversion chamber 21 and the exhaust pipe 41, and the outlet of the fresh air pipe 31 faces the main heat pipe 23 and the auxiliary heat pipe 24 to achieve fresh air heating;

[0055] A gap is provided between the main heat pipe 23 and the auxiliary heat pipe 24 to allow fresh air to circulate. Four heat sinks 6 are installed on each of the main and auxiliary heat pipes 23, 24. These fins 6 are arranged along their lengths. There are four heat sinks 6, and the spacing between adjacent fins is uniform.

[0056] The heat sink 6 is arranged at the outlet of the fresh air duct 31 , so the temperature of the air flow increases after the fresh air blown out of the fresh air duct 31 contacts the heat sink 6 , thereby achieving the effect of heating the air flow.

[0057] The main heat pipe 23 is located in the middle of the airflow conversion cabin 21, and the auxiliary heat pipes 24 are located on both sides of the main heat pipe 23. A partition plate 22 is fixed in the airflow conversion cabin 21 to separate the 20 main heat pipes 23. The partition plate 22 divides the airflow conversion cabin 21 into two cabins. The main heat pipes 23 and the auxiliary heat pipes 24 are equally divided into two cabins by the partition plate 22. There are 10 main heat pipes 23 and 6 auxiliary heat pipes 24 in one cabin.

[0058] The airflow in the combustion chamber 1 enters the airflow conversion cabin 21 through the main heat pipe 23. The airflow conversion cabin 21 is divided into two cabins. Therefore, the airflow in the airflow conversion cabin 21 is split to the left and right sides respectively and enters the air outlet branch pipes 5 on both sides respectively.

[0059] Two air outlet branch pipes 5 are located on both sides of the combustion chamber 1 . The air outlet branch pipes 5 connect the air flow conversion cabin 21 and the exhaust pipe 41 . The secondary heat conduction pipe 24 connects the air outlet branch pipe 5 and the exhaust pipe 41 in sequence. The air outlet branch pipe 5 is arranged in close proximity to the fresh air pipe 31 .

[0060] A sloping plate 51 is fixed to the upper end of the outlet branch pipe 5. The sloping plates 51 are located within the combustion chamber 1. The sloping plates 51 on both sides are tilted toward the main heat pipe 23 to guide the heat flow into the main heat pipe 23. The sloping plates 51 are located at the boundary between the main heat pipe 23 and the secondary heat pipe 24. Therefore, the exhaust gas from the airflow conversion chamber 21 can be quickly directed through the sloping plates 51 into the outlet branch pipe 5.

[0061] Reference Figure 6 Working principle: The hot exhaust gas after combustion is quickly diverted into the main air pipe through the inclined plate 51, and the heated main air pipe heats the air flow blown out of the fresh air pipe 31;

[0062] The hot exhaust gas in the main air duct enters the auxiliary air ducts on both sides through the diversion of the partition plate 22. The heated auxiliary air ducts heat the air flow blown out of the fresh air duct 31.

[0063] The hot exhaust gas flowing out of the auxiliary air duct is guided to the bottom of the fireplace through the air outlet branch pipes 5 on both sides, and then the air outlet branch pipes 5 are connected to the exhaust pipe 41, and the hot exhaust gas is discharged through the exhaust pipe 41.

[0064] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An airflow exchange system for a fireplace, comprising a combustion chamber (1) and an exhaust pipe (41), characterized in that: A fresh air pipe (31) for blowing air is installed on the back of the combustion chamber (1), and a heat exchange chamber (2) is installed on the top of the combustion chamber (1); The heat exchange chamber (2) includes an airflow conversion chamber (21), a plurality of main heat conducting pipes (23) and a plurality of auxiliary heat conducting pipes (24), wherein the main heat conducting pipes (23) are connected to the airflow conversion chamber (21) and the combustion chamber (1), and the auxiliary heat conducting pipes (24) are connected to the airflow conversion chamber (21) and the exhaust pipe (41), and the exhaust pipe (41) is equipped with an exhaust fan (42); The outlet of the fresh air pipe (31) faces the main heat pipe (23) and the auxiliary heat pipe (24) to achieve fresh air heating, and a gap is provided between the main heat pipe (23) and the auxiliary heat pipe (24) for fresh air circulation; the main heat pipe (23) and the auxiliary heat pipe (24) are equipped with a plurality of heat sinks (6), and the heat sinks (6) are arranged along the length direction of the main heat pipe (23) and the auxiliary heat pipe (24); The main heat pipe (23) is located in the middle of the airflow conversion cabin (21), and the auxiliary heat pipes (24) are located on both sides of the main heat pipe (23). A partition plate (22) for separating the plurality of main heat pipes (23) is fixed in the airflow conversion cabin (21), and the partition plate (22) divides the airflow conversion cabin (21) into two cabins. The main heat pipe (23) and the auxiliary heat pipe (24) are equally divided into two compartments by a partition plate (22); An inclined plate (51) is fixed to the upper end of the outlet branch pipe (5), and the inclined plate (51) is located in the combustion chamber (1). The inclined plates (51) on both sides are inclined toward the main heat pipe (23) to guide the heat flow into the main heat pipe (23); The inclined plate (51) is located at the boundary between the main heat pipe (23) and the auxiliary heat pipe (24); The outlet of the fresh air pipe (31) is provided with a splitter plate (71) for dividing the air flow into an upper air flow and a lower air flow, wherein the lower air flow is directed toward the main heat pipe (23) and the auxiliary heat pipe (24); An upper warm air pipe (72) is provided above the airflow conversion cabin (21); a top plate of the airflow conversion cabin (21) serves as a pipe wall of the upper warm air pipe (72); one end of the upper warm air pipe (72) is connected to the upper airflow; and the other end of the upper warm air pipe (72) is located above the heat sink (6).

2. The fireplace airflow exchange system according to claim 1, characterized in that: The number of the heat sinks (6) is 4, and the spacing between adjacent heat sinks (6) is the same.

3. The fireplace airflow exchange system according to claim 1, characterized in that: Gas outlet branches (5) are provided on both sides of the combustion chamber (1), the gas outlet branches (5) are connected to the airflow conversion cabin (21) and the exhaust pipe (41), and the auxiliary heat conduction pipe (24) is connected to the gas outlet branches (5) and the exhaust pipe (41) in sequence.

4. The fireplace airflow exchange system according to claim 3, characterized in that: The outlet branch pipe (5) is arranged in close contact with the fresh air pipe (31).

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