A fully premixed gas hot water boiler preventing flue gas backflow

Abstract

The utility model relates to a fully premixed gas hot water boiler for preventing smoke backflow, comprising a fan, a heat exchanger, a burner, a smoke pipe and an outer cover fixed at the lower end of the fan, wherein the heat exchanger is installed at the inner upper part of the burner, one end of the heat exchanger is connected to the fan, the bottom of the heat exchanger is connected to the smoke pipe, the smoke pipe passes through the outer cover and extends to the outside of the outer cover, and the fully premixed gas hot water boiler for preventing smoke backflow also includes a steering smoke exhauster, which is installed on the outer wall of the outer cover, and the steering smoke exhauster has a movable part with adjustable direction. Through the coordinated arrangement of the steering smoke exhauster and the smoke pipe, the direction of the extended flue can be adjusted in advance according to the external wind force and wind direction during the boiler smoke emission process, so that the flow direction of the smoke during emission is the same as the wind direction, thereby avoiding the smoke from being affected by the external wind force and generating backflow, and improving the safety of the equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of gas boilers, in particular to a full premixed gas hot water boiler capable of preventing smoke backflow. Background Art

[0002] In a fully premixed gas hot water boiler, the gas passes through a proportional valve and enters the premixing chamber to mix with the air (pre-premixing). The mixed gas is blown into the burner by a fan for combustion. The high-temperature flue gas after combustion passes through a heat exchanger for rapid heat exchange and condensation, and the remaining exhaust gas is discharged from the smoke pipe. The closed-circuit water system is powered by a water pump. The low-temperature water flows into the water pump after passing through the external heat dissipation terminal or the plate heat exchanger. After the water pump provides power, it presses the water into the heat exchanger for heat exchange, and finally flows back to the heat dissipation terminal or the plate heat exchanger, thus circulating and continuously exchanging heat. The flue of a fully premixed gas hot water boiler generally leads to the outdoors. When it is windy and the wind is strong, especially when the direction of the wind is opposite to the direction of the smoke exhaust, it will cause poor smoke exhaust, affect combustion, and even cause the risk of flashback of the metal fiber burner.

[0003] To this end, a safe fully premixed low-nitrogen condensing gas hot water boiler is proposed in the Chinese utility model patent with Chinese patent publication number CN215809334U. By arranging a fan and an anti-backflow component on the flue, the boiler can prevent wind from blowing into the flue, maintain smooth smoke exhaust, and avoid the risk of flashback of the metal fiber burner.

[0004] However, this type of safe fully premixed low-nitrogen condensing gas hot water boiler needs to rely on the activation of the fan to increase the flow rate of the flue gas to counteract the external wind force, thereby preventing the flue gas from flowing back. However, when the external wind force is strong, it is difficult to avoid the flue gas from flowing back only by relying on the assistance of the fan. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] The utility model provides a full premixed gas hot water boiler for preventing smoke backflow, which solves the problem that when the external wind force is strong, it is difficult to avoid smoke backflow only by relying on the assistance of a fan.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fully premixed gas hot water boiler that prevents smoke backflow, comprising a fan, a heat exchanger, a burner, a smoke pipe and an outer cover fixed at the lower end of the fan, the heat exchanger is installed at the inner upper part of the burner, one end of the heat exchanger is connected to the fan, the bottom of the heat exchanger is connected to the smoke pipe, the smoke pipe passes through the outer cover and extends to the outside of the outer cover, the fully premixed gas hot water boiler that prevents smoke backflow also includes a steering smoke exhauster, the steering smoke exhauster is installed on the outer wall of the outer cover, and the steering smoke exhauster has a movable part with adjustable direction, one end of the smoke pipe extending to the outside of the outer cover extends into the steering smoke exhauster, and the inner cavity of the smoke pipe is communicated with the movable part of the steering smoke exhauster, so that the movable part of the steering smoke exhauster adjusts the flow direction of smoke discharged from the smoke pipe.

[0009] Preferably, the steering smoke exhauster includes a bracket, a double-connected pipe, an extended flue, a steering transmission structure and a power source, the bracket is mounted and fixed on the outer wall of the outer cover, the double-connected pipe is formed on the side of the bracket facing away from the outer cover, the smoke pipe extends into the double-connected pipe, the extended flue is configured as a curved pipe, and one end of the extended flue can be rotatably extended into the double-connected pipe, the power source is mounted and fixed on the bracket, the steering transmission structure is respectively connected to the outer wall of the extended flue and the output end of the power source, so that the power source drives the steering transmission structure to adjust the direction of the extended flue, and the extended flue constitutes the movable part of the steering smoke exhauster.

[0010] It is further preferred that the steering smoke exhauster also includes a first limit ring, a second limit ring and a deflection ring, the first limit ring is formed on the inner wall of the double-connected tube, the second limit ring is detachably fixed to one end of the double-connected tube back-facing bracket, the deflection ring is formed on the outer wall of one end of the extended flue extending into the double-connected tube, and the deflection ring is rotatably arranged between the first limit ring and the second limit ring, the outer diameter of the deflection ring is adapted to the inner diameter of the double-connected tube, and the outer diameter of the deflection ring is smaller than the inner diameter of the first limit ring and the second limit ring.

[0011] It is further preferred that the steering transmission structure is configured as a belt transmission structure, a chain transmission structure or a gear transmission structure.

[0012] It is further preferred that the outer diameter of the smoke pipe is matched with the inner diameter of the double-connected tube, and the smoke pipe and the double-connected tube are sealed and connected.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a fully premixed gas hot water boiler that prevents flue gas backflow, which has the following beneficial effects:

[0015] In the utility model, by coordinating the turning smoke exhaust device with the smoke pipe, the direction of the extended flue can be adjusted in advance according to the external wind force and wind direction during the boiler smoke emission process, so that the flow direction of the smoke during emission is the same as the wind direction, thereby avoiding the backflow of the smoke due to the influence of external wind force, thereby improving the safety of equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a full premixed gas hot water boiler for preventing flue gas backflow according to an implementation scheme;

[0017] Figure 2 is a schematic structural diagram of a diverting smoke evacuator according to an implementation scheme;

[0018] Figure 3 for Figure 2 Schematic diagram of the structure after part of the structure of the steering smoke exhauster is cut away.

[0019] In the figure: 10, fan; 20, heat exchanger; 30, burner; 40, smoke pipe; 50, outer cover; 60, steering smoke exhauster; 61, bracket; 62, double-connected pipe; 63, first limit ring; 64, second limit ring; 65, deflection ring; 66, extended flue; 67, steering transmission structure; 68, power source. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3A fully premixed gas hot water boiler for preventing flue gas backflow comprises a fan 10, a heat exchanger 20, a burner 30, a smoke pipe 40, an outer cover 50 fixed at the lower end of the fan 10, and a diverting smoke exhauster 60. The heat exchanger 20 is installed at the inner upper part of the burner 30, one end of the heat exchanger 20 is connected to the fan 10, the bottom of the heat exchanger 20 is connected to the smoke pipe 40, the smoke pipe 40 passes through the outer cover 50 and extends to the outside of the outer cover 50, so that the smoke pipe 40 can be used to guide the smoke outward during the use of the equipment. The deflection smoke exhauster 60 is installed on the outer wall of the outer cover 50, and the deflection smoke exhauster 60 has an adjustable movable part. The end of the smoke pipe 40 extending to the outside of the outer cover 50 extends into the deflection smoke exhauster 60, and the inner cavity of the smoke pipe 40 is connected to the movable part of the deflection smoke exhauster 60. After the movable part of the deflection smoke exhauster 60 is adjusted in direction, the flow direction of smoke discharged from the smoke pipe 40 can be changed, and when the flow direction of smoke is the same as the external wind direction, the smoke can be prevented from being blown back by the wind. In order to be able to automatically control, a wind vane can also be installed outdoors for use with the deflection smoke exhauster 60, so that the wind vane monitors the external wind direction and transmits the feedback signal to the control system, and the control system is used to adjust the direction of the movable part of the deflection smoke exhauster 60.

[0022] See also Figure 2 and Figure 3The deflection smoke exhauster 60 may include a bracket 61, a double-connected pipe 62, a first limiting ring 63, a second limiting ring 64, a deflection ring 65, an extension flue 66, a deflection transmission structure 67 and a power source 68. The bracket 61 is fixedly mounted on the outer wall of the outer cover 50, the double-connected pipe 62 is formed on the side of the bracket 61 facing away from the outer cover 50, the smoke pipe 40 extends into the double-connected pipe 62, the outer diameter of the smoke pipe 40 is matched with the inner diameter of the double-connected pipe 62, and the smoke pipe 40 and the double-connected pipe 62 are sealed and connected, so that smoke can be input from the smoke pipe 40 into the double-connected pipe 62. The extension flue 66 is set as a curved pipe, and one end of the extension flue 66 can be rotatably extended into the double-connected pipe 62, so that the smoke input into the double-connected pipe 62 can be discharged outward along the extension flue 66. The power source 68 is mounted and fixed on the bracket 61, and the steering transmission structure 67 is connected to the outer wall of the extension flue 66 and the output end of the power source 68, so that the power source 68 drives the steering transmission structure 67 to adjust the direction of the extension flue 66, and the extension flue 66 constitutes the active part of the steering smoke exhauster 60. The power source can be a servo motor or other driving device; the steering transmission structure 67 can be a belt transmission structure, a chain transmission structure or a gear transmission structure existing in the prior art. The first limiting ring 63 is formed on the inner wall of the double-connected tube 62, the second limiting ring 64 is detachably fixed on one end of the double-connected tube 62 facing away from the bracket 61, the deflection ring 65 is formed on the outer wall of one end of the extended flue 66 extending into the double-connected tube 62, and the deflection ring 65 is rotatably arranged between the first limiting ring 63 and the second limiting ring 64, the outer diameter of the deflection ring 65 is adapted to the inner diameter of the double-connected tube 62, and the outer diameter of the deflection ring 65 is smaller than the inner diameters of the first limiting ring 63 and the second limiting ring 64, so that the extended flue 66 can use the first limiting ring 63 and the second limiting ring 64 to limit the deflection ring 65 when deflecting, so as to prevent the extended flue 66 from being separated from the double-connected tube 62.

[0023] The system of the present invention may also include a control system for controlling the operation of the motor and the like to automatically adjust the direction of the active part of the smoke evacuator. It should be understood that the control system has no particular limitation and can be implemented by the control technology in the prior art, which will not be described in detail here.

[0024] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which are not described one by one here. In the above, all fixed connections are preferably welded. Although the embodiments of the utility model have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A fully premixed gas hot water boiler for preventing flue gas backflow, comprising a fan (10), a heat exchanger (20), a burner (30), a smoke pipe (40), and an outer cover (50) fixed to the lower end of the fan (10), wherein the heat exchanger (20) is installed on the inner upper part of the burner (30), one end of the heat exchanger (20) is connected to the fan (10), the bottom of the heat exchanger (20) is connected to the smoke pipe (40), and the smoke pipe (40) passes through the outer cover (50) and extends to the outside of the outer cover (50), characterized in that: It also includes a diverting smoke exhauster (60), which is installed on the outer wall of the outer cover (50) and has a movable part with adjustable direction. One end of the smoke pipe (40) extending to the outside of the outer cover (50) extends into the diverting smoke exhauster (60), and the inner cavity of the smoke pipe (40) is communicated with the movable part of the diverting smoke exhauster (60), so that the movable part of the diverting smoke exhauster (60) can adjust the flow direction of smoke discharged from the smoke pipe (40).

2. A fully premixed gas hot water boiler for preventing flue gas backflow according to claim 1, characterized in that: The deflection smoke exhauster (60) comprises a bracket (61), a double-connected pipe (62), an extended flue (66), a deflection transmission structure (67) and a power source (68). The bracket (61) is fixedly mounted on the outer wall of the outer cover (50). The double-connected pipe (62) is formed on the side of the bracket (61) facing away from the outer cover (50). The smoke pipe (40) extends into the double-connected pipe (62). The extended flue (66) is configured as a curved pipe, and one end of the extended flue (66) can be rotatably extended into the double-connected pipe (62). The power source (68) is fixedly mounted on the bracket (61). The deflection transmission structure (67) is respectively connected to the outer wall of the extended flue (66) and the output end of the power source (68), so that the power source (68) drives the deflection transmission structure (67) to adjust the direction of the extended flue (66). The extended flue (66) constitutes the movable part of the deflection smoke exhauster (60).

3. A fully premixed gas hot water boiler for preventing flue gas backflow according to claim 2, characterized in that: The deflection smoke exhauster (60) further comprises a first limiting ring (63), a second limiting ring (64) and a deflection ring (65), wherein the first limiting ring (63) is formed on the inner wall of the double-connected tube (62), the second limiting ring (64) is detachably fixed to one end of the double-connected tube (62) which is away from the bracket (61), and the deflection ring (65) is formed on the outer wall of one end of the extended flue (66) extending into the double-connected tube (62), and the deflection ring (65) is rotatably arranged between the first limiting ring (63) and the second limiting ring (64).

4. A fully premixed gas hot water boiler for preventing flue gas backflow according to claim 3, characterized in that: The outer diameter of the deflection ring (65) is matched to the inner diameter of the double-connected tube (62), and the outer diameter of the deflection ring (65) is smaller than the inner diameters of the first limiting ring (63) and the second limiting ring (64).

5. A fully premixed gas hot water boiler for preventing flue gas backflow according to any one of claims 2 to 4, characterized in that: The steering transmission structure (67) is configured as a belt transmission structure, a chain transmission structure or a gear transmission structure.

6. A fully premixed gas hot water boiler for preventing flue gas backflow according to claim 1, characterized in that: The outer diameter of the smoke pipe (40) is matched to the inner diameter of the double-connected pipe (62), and the smoke pipe (40) and the double-connected pipe (62) are sealed and connected.

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