Gas heater capable of preheating air

Abstract

The utility model discloses a gas heater capable of preheating air. The gas heater comprises an air heat exchange chamber, an air inlet channel, a first heat exchanger, a burner assembly, a second heat exchanger and a smoke exhaust channel. An air outlet is formed in one end of the air heat exchange chamber, the other end of the air heat exchange chamber communicates with the air inlet channel, and a first fan is arranged in the air heat exchange chamber and used for blowing air to the air outlet; the first heat exchanger is provided with a combustion chamber, the combustor assembly comprises a combustor, and the combustor is arranged in the combustion chamber; the first heat exchanger is used for conducting heat exchange on hot air in the combustion chamber and air in the air heat exchange chamber. The second heat exchanger is provided with a heat exchange cavity, the combustion chamber, the heat exchange cavity and the smoke exhaust channel communicate in sequence, and the second heat exchanger is arranged in the air inlet channel and used for conducting heat exchange on smoke in the heat exchange cavity and air in the air inlet channel. According to the utility model, the air in the air inlet channel can be preheated by utilizing the heat of smoke, so that the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas heaters, in particular to a gas heater capable of preheating air. Background Art

[0002] Traditional gas heaters heat the air through a heat exchanger, and then blow the heated air out through a fan to achieve the purpose of heating. For the sake of safety, the smoke generated by combustion will be discharged through an independent smoke exhaust channel, which is especially suitable for gas heaters used outdoors such as tent heaters and RV heaters. For example, the Chinese utility model patent with announcement number CN600050993U discloses similar gas heaters. However, the smoke after heat exchange of these gas heaters still has a high temperature. Directly discharging it outside will lose a lot of heat, which undoubtedly reduces the heat exchange efficiency. Utility Model Content

[0003] The utility model provides a gas heater capable of preheating air, which can utilize the heat of smoke to preheat the air in an air intake passage, thereby improving heat exchange efficiency.

[0004] In order to solve the above problems, the utility model adopts the following technical solutions:

[0005] An embodiment of the utility model provides a gas heater that can preheat air, comprising an air heat exchange chamber, an air intake passage, a first heat exchanger, a burner assembly, a second heat exchanger and a smoke exhaust passage; one end of the air heat exchange chamber is provided with an air outlet, and the other end is connected to the air intake passage, and a first fan is provided in the air heat exchange chamber, and the first fan is used to blow air toward the air outlet; the first heat exchanger has a combustion chamber, and the burner assembly includes a burner, and the burner is arranged in the combustion chamber; the first heat exchanger is used to exchange heat between the hot air in the combustion chamber and the air in the air heat exchange chamber; the second heat exchanger has a heat exchange cavity, and the combustion chamber, the heat exchange cavity and the smoke exhaust passage are connected in sequence, the second heat exchanger is arranged in the air intake passage, and the second heat exchanger is used to exchange heat between the smoke in the heat exchange cavity and the air in the air intake passage.

[0006] In some embodiments, a condensate drain pipe is also included, and the condensate drain pipe is connected to the heat exchange chamber.

[0007] In some embodiments, the condensate drain pipe is disposed at the lowest point of the heat exchange chamber.

[0008] In some embodiments, the first heat exchanger is cylindrical, and a plurality of heat exchange fins extending outward are disposed on an outer peripheral surface of the first heat exchanger.

[0009] In some embodiments, the heat exchange fins pass through a side wall of the first heat exchanger and extend into the combustion chamber.

[0010] In some embodiments, the outer peripheral contour of the heat exchange fins is adapted to the cross-sectional shape of the air heat exchange chamber, and the heat exchange fins abut against the inner wall of the air heat exchange chamber.

[0011] In some embodiments, the burner extends from an end surface of the first heat exchanger into the combustion chamber and extends along the axial direction of the first heat exchanger.

[0012] In some embodiments, the burner assembly also includes an air supply pipeline, a second fan and a gas supply assembly, the air supply pipeline is connected to the burner, the second fan is connected to the air supply pipeline, the second fan is used to blow the gas in the air supply pipeline toward the burner, and the gas supply assembly is connected to the air supply pipeline and is used to supply gas to the air supply pipeline.

[0013] In some embodiments, the gas supply assembly includes a gas supply pipeline, a proportional valve, a pressure reducing valve and a gas cylinder. The two ends of the gas supply pipeline are respectively connected to the air supply pipeline and the gas cylinder, and the proportional valve and the pressure reducing valve are both arranged in the gas supply pipeline.

[0014] The utility model has at least the following beneficial effects: the utility model is provided with a second heat exchanger in the air intake channel, and the second heat exchanger can perform heat exchange between the flue gas in its heat exchange chamber and the air in the air intake channel, thereby utilizing the heat in the flue gas to preheat the air, and the preheated air then flows to the air heat exchange chamber, and is reheated by the first heat exchanger, which can improve the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the principle of a gas heater capable of preheating air according to an embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the principle of connecting a first heat exchanger and a burner assembly in one embodiment of the utility model;

[0017] Figure 3 It is a cross-sectional schematic diagram of a gas heater capable of preheating air according to an embodiment of the utility model;

[0018] Figure 4 This is a schematic structural diagram of a gas heater capable of preheating air according to an embodiment of the utility model;

[0019] Figure 5 This is a schematic structural diagram of a first heat exchanger according to an embodiment of the utility model.

[0020] Wherein, the accompanying drawings are marked as follows:

[0021] Air heat exchange channel 100, first fan 110, air outlet 120;

[0022] Intake passage 200;

[0023] A first heat exchanger 310, a combustion chamber 311, heat exchange fins 312, a second heat exchanger 320, and a heat exchange cavity 321;

[0024] Burner assembly 400, burner 410, air supply pipeline 420, second fan 421, gas supply pipeline 430, gas bottle 440, proportional valve 450, pressure reducing valve 460;

[0025] Smoke exhaust duct 500;

[0026] Condensate drain pipe 600. DETAILED DESCRIPTION

[0027] The utility model provides the following description with reference to the accompanying drawings to help fully understand the various embodiments of the utility model as defined by the claims and their equivalents. The description includes various specific details to help understanding, but these details should be regarded as exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the utility model.

[0028] In the description of the present invention, descriptions of orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] It will be understood that when one element (eg, a first element) is “connected” to another element (eg, a second element), the element may be directly connected to the other element or an intervening element (eg, a third element) may be present between the element and the other element.

[0030] The embodiment of the utility model provides a gas heater capable of preheating air, such as Figure 1-5As shown, it includes an air heat exchange chamber 100, an air inlet passage 200, a first heat exchanger 310, a burner assembly 400, a second heat exchanger 320 and a smoke exhaust passage 500. An air outlet 120 is provided at one end of the air heat exchange chamber 100, and the other end of the air heat exchange chamber 100 is connected to the air inlet passage 200. A first fan 110 is provided in the air heat exchange chamber 100. When the first fan 110 is working, it blows air toward the air outlet 120. Under the action of the airflow, the cold air from the outside will flow toward the air heat exchange chamber 100 through the air inlet passage 200. After the air is heated, the hot air is blown out through the corresponding air outlet 120, so that hot air can be continuously supplied to the outside to achieve the purpose of heating. The first heat exchanger 310 has a combustion chamber 311, and the burner assembly 400 includes a burner 410. The burner 410 is arranged in the combustion chamber 310. The burner 410 will form a flame in the combustion chamber 311 to heat the combustion chamber 311. The first heat exchanger 310 can make the hot air in the combustion chamber 311 exchange heat with the air in the air heat exchange chamber 100, so that the air in the air heat exchange chamber 100 is heated. At the same time, since the combustion chamber 311 is independent of the air heat exchange chamber 100, the smoke generated by the combustion will not be blown out together with the air in the air heat exchange chamber 100, which is safer to use. The second heat exchanger 320 has a heat exchange chamber 321. The combustion chamber 311, the heat exchange chamber 321 and the smoke exhaust channel 500 are connected in sequence. The smoke generated in the combustion chamber 311 can enter the heat exchange chamber 321. The second heat exchanger 320 is arranged in the air intake channel 200. The second heat exchanger 320 is used to make the smoke in the heat exchange chamber 321 exchange heat with the air in the air intake channel 200, so as to use the heat in the smoke to preheat the air in the air intake channel 200. The preheated air flows to the air heat exchange chamber 100, and the first heat exchanger 310 performs secondary heating on the preheated air, which can improve the heat exchange efficiency and improve the heating effect of the heater. The smoke after heat exchange with the air in the air intake channel 200 is discharged through the smoke exhaust channel 500.

[0031] In some embodiments, a condensate discharge pipe 600 is also included, and the condensate discharge pipe 600 is connected to the heat exchange chamber 321. Since the air temperature in the air inlet channel 200 is relatively low, and the flue gas in the heat exchange chamber 321 contains high-temperature steam, the inner wall of the heat exchange chamber 321 forms a cooling surface, so it is very easy to form condensate on the inner wall of the heat exchange chamber 321. In this embodiment, the condensate can be discharged through the condensate discharge pipe 600 to avoid the accumulation of condensate in the heat exchange chamber 321, thereby ensuring the heat exchange effect of the second heat exchanger 320.

[0032] Furthermore, the condensate drain pipe 600 is arranged at the lowest point of the heat exchange chamber 321, and the condensate can naturally flow to the condensate drain pipe 600 under the action of gravity, thereby facilitating the condensate to be discharged through the condensate drain pipe 600.

[0033] In some embodiments, the first heat exchanger 310 is cylindrical, and a plurality of heat exchange fins 312 extending outward are provided on the outer peripheral surface of the first heat exchanger 310, which is equivalent to increasing the contact area between the air in the air heat exchange channel 100 and the first heat exchanger 310, thereby improving the heat exchange efficiency.

[0034] Furthermore, the heat exchange fins 312 pass through the side wall of the first heat exchanger 310 and extend into the combustion chamber 311, which is equivalent to increasing the contact area between the hot gas in the combustion chamber 311 and the first heat exchanger 310, and can further improve the heat exchange efficiency.

[0035] In some embodiments, the outer peripheral contour of the heat exchange fin 312 is adapted to the cross-sectional shape of the air heat exchange chamber 100, and the heat exchange fin 312 abuts against the inner wall of the air heat exchange chamber 100, so that the first heat exchanger 310 will not be relative to the air heat exchange chamber 100, so as to be stably fixed in the air heat exchange chamber 100.

[0036] like Figure 5 As shown, the outer periphery of the heat exchange fin 312 is square, and accordingly, the cross-sectional shape of the air heat exchange chamber may also be square. The extension direction of the heat exchange fin 312 may be parallel to the blowing direction of the first fan 110 so as not to block the air flow.

[0037] In some embodiments, the burner 410 extends from an end surface of the first heat exchanger 310 into the combustion chamber 311 , and the burner 410 extends along the axial direction of the first heat exchanger 310 , so that the flame generated by the burner 410 can heat the first heat exchanger 310 relatively evenly.

[0038] In some embodiments, the burner assembly 400 further includes an air supply pipeline 420, a second fan 421, and a gas supply assembly. The air supply pipeline 420 is connected to the burner 410, and the second fan 421 is connected to the air supply pipeline 420. The second fan 421 is used to blow the gas in the air supply pipeline 420 toward the burner 410. The gas supply assembly is connected to the air supply pipeline 420 and is used to supply gas to the air supply pipeline 420. Under the action of the airflow, the gas will flow along the air supply pipeline 420 to the burner 410 along with the external air. After being ignited, the mixed gas of the gas and air forms a flame on the outside of the burner 410.

[0039] Furthermore, the gas supply assembly includes a gas supply pipeline 430, a proportional valve 450, a pressure reducing valve 460 and a gas cylinder 440. The gas cylinder 440 is loaded with gas. The two ends of the gas supply pipeline 430 are respectively connected to the air supply pipeline 420 and the gas cylinder 440. The proportional valve 450 and the pressure reducing valve 460 are both arranged in the gas supply pipeline 430. The pressure reducing valve 460 can reduce the pressure of the gas sprayed from the gas cylinder 440, and the proportional valve 450 can adjust the flow rate of the gas.

[0040] The terms and words used in the above description and claims are not limited to the literal meanings, but are only used by the applicant to enable a clear and consistent understanding of the utility model. Therefore, it should be clear to those skilled in the art that the above description of various embodiments of the utility model is provided only for illustration, and not for limiting the utility model as defined by the attached claims and their equivalents.

Claims

1. A gas heater capable of preheating air, characterized in that: It includes an air heat exchange chamber, an air intake channel, a first heat exchanger, a burner assembly, a second heat exchanger and a smoke exhaust channel; one end of the air heat exchange chamber is provided with an air outlet, and the other end is connected with the air intake channel; a first fan is provided in the air heat exchange chamber, and the first fan is used to blow air to the air outlet; the first heat exchanger has a combustion chamber, and the burner assembly includes a burner, and the burner is arranged in the combustion chamber; the first heat exchanger is used to exchange heat between the hot air in the combustion chamber and the air in the air heat exchange chamber; the second heat exchanger has a heat exchange cavity, and the combustion chamber, the heat exchange cavity and the smoke exhaust channel are connected in sequence; the second heat exchanger is arranged in the air intake channel, and the second heat exchanger is used to exchange heat between the smoke in the heat exchange cavity and the air in the air intake channel.

2. The gas heater capable of preheating air according to claim 1, characterized in that: It also includes a condensate drain pipeline, which is connected to the heat exchange chamber.

3. The gas heater capable of preheating air according to claim 2, characterized in that: The condensate discharge pipeline is arranged at the lowest point of the heat exchange chamber.

4. The gas heater capable of preheating air according to claim 1, characterized in that: The first heat exchanger is cylindrical, and a plurality of heat exchange fins extending outward are arranged on the outer peripheral surface of the first heat exchanger.

5. The gas heater capable of preheating air according to claim 4, characterized in that: The heat exchange fins pass through the side wall of the first heat exchanger and extend into the combustion chamber.

6. The gas heater capable of preheating air according to claim 4, characterized in that: The outer peripheral contour of the heat exchange fins is matched with the cross-sectional shape of the air heat exchange chamber, and the heat exchange fins abut against the inner wall of the air heat exchange chamber.

7. The gas heater capable of preheating air according to claim 4, characterized in that: The burner extends from an end surface of the first heat exchanger into the combustion chamber and extends along the axial direction of the first heat exchanger.

8. The gas heater capable of preheating air according to any one of claims 1 to 7, characterized in that: The burner assembly also includes an air supply pipeline, a second fan and a gas supply assembly, the air supply pipeline is connected to the burner, the second fan is connected to the air supply pipeline, the second fan is used to blow the gas in the air supply pipeline toward the burner, and the gas supply assembly is connected to the air supply pipeline and is used to supply gas to the air supply pipeline.

9. The gas heater capable of preheating air according to claim 8, characterized in that: The gas supply assembly includes a gas supply pipeline, a proportional valve, a pressure reducing valve and a gas cylinder. The two ends of the gas supply pipeline are respectively connected to the air supply pipeline and the gas cylinder. The proportional valve and the pressure reducing valve are both arranged in the gas supply pipeline.

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