CN219328081U

CN219328081U - Air inlet connecting assembly and gas boiler thereof

Info

Publication number: CN219328081U
Application number: CN202223358478.0U
Authority: CN
Inventors: 徐意; 石宏军
Original assignee: Desen Changzhou Energy Equipment Co ltd
Current assignee: Desen Changzhou Energy Equipment Co ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-07-11
Anticipated expiration: 2032-12-14

Abstract

The utility model discloses an air inlet connecting component and a gas boiler thereof, wherein the air inlet connecting component comprises an end cover, a communicating pipe and a transition flange; the end cover is provided with an abutting groove for abutting the burner, and a first heat insulation pad is arranged in the abutting groove; the communicating pipe comprises a fixed end, a mixed end and a connecting end, wherein the fixed end is used for being matched with the end cover to fixedly install the burner, the mixed end is gradually increased along the air flow direction, and a second heat insulation pad is arranged between the connecting end and the transition flange. Above-mentioned inlet connection subassembly has replaced traditional integral type end cover through being equipped with subassembly such as end cover, communicating pipe and transition flange, arranges in between end cover and the combustor through first heat insulating mattress to the heat transfer between separation combustion chamber and the combustor, the rethread second heat insulating mattress carries out the separation with the heat between communicating pipe and the transition flange, has reduced the produced heat of mixed gas burning and has further transmitted to on the fan, can make gas and air mix fully simultaneously, further improves the thermal efficiency of boiler.

Description

Air inlet connecting assembly and gas boiler thereof

Technical Field

The utility model relates to the technical field of gas boilers, in particular to an air inlet connecting assembly and a gas boiler thereof.

Background

The boiler is an energy conversion device, the energy input to the boiler is chemical energy and electric energy in fuel, and the boiler outputs steam, high temperature water or organic heat carrier with certain heat energy. The gas boiler is a boiler using natural gas as main fuel, which is widely used in life and industrial production by mixing natural gas with air, inputting the mixture into a burner, igniting the mixture for combustion, and then exchanging heat between the obtained high-temperature flue gas and cold water to generate high-temperature hot water or water vapor.

In the prior art, a venturi, a fan, a burner and a combustion chamber are arranged in a gas boiler, gas enters the fan after the proportion is regulated and controlled by the venturi, the fan mixes the gas with air pumped in by the fan through rotation in the fan, and the mixed gas after mixing is input into the burner again to be ignited and combusted in the combustion chamber. The fan is connected with the burner through the end cover, the burner is fixed in the combustion chamber, and the heat insulation is carried out between the end cover and the burner or the combustion chamber through installing a thicker heat insulation plate (generally aluminum silicate high temperature resistant fiber board material) so as to prevent the end cover from being overheated.

The processing mode can solve the problem of higher temperature of the end cover to a certain extent, but as the end cover is integrally arranged, heat is still transferred through contact between metals along with the increase of service time, so that the temperature is still increased, part of heat is transferred to a fan or a venturi all the time, and the tightness of non-high temperature resistant equipment is affected; meanwhile, the combustion stability of a general combustor is related to whether mixed gas is fully mixed, the speed of gas flow speed and the like, and when the flow speed of the mixed gas is high, the mixed gas entering a combustion chamber is easy to distribute unevenly, the combustion is insufficient, and the thermal efficiency of a boiler is directly affected. When the flow speed of the mixed gas is slow or the air pressure is low, the flow speed of the mixed gas at the fire hole of the burner is slow, and when the flow speed is slow to be less than the combustion speed, the backfire phenomenon occurs.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the purposes of the utility model is to provide an air inlet connecting assembly, which solves the conventional problems, can reduce heat transfer to a fan, can fully mix fuel gas and air, fully burn mixed gas in a combustion chamber, and further improve the thermal efficiency of a boiler.

The second object of the utility model is to provide a gas boiler adopting the gas inlet connecting assembly.

One of the purposes of the utility model is realized by adopting the following technical scheme:

an air inlet connecting assembly is used for connecting a combustor and a fan and comprises an end cover, a communicating pipe connected with the end cover and a transition flange; the middle part of the end cover is provided with a mounting hole for the burner to pass through, one end of the end cover, which faces the communicating pipe fitting, is provided with an abutting groove for the mounting flange of the burner to abut, and a first heat insulation pad is arranged in the abutting groove; the communicating pipe comprises a fixed end, a mixed end and a connecting end, wherein the fixed end is used for being matched with the end cover to fixedly install the combustor, the mixed end is gradually increased along the air flow direction, a second heat insulation pad is arranged between the connecting end and the transition flange, and the transition flange is used for being connected with the fan.

Preferably, the mixing end is provided with a first mixing cavity and a second mixing cavity, the first mixing cavity is arranged in a circular shape, and the second mixing cavity is arranged in a square shape.

Preferably, the transition flange is provided with an insert for insertion into the second mixing chamber.

Preferably, the embedded part is provided with an embedded opening, and the embedded opening is obliquely arranged from bottom to top.

Preferably, the inclination angle of the embedded opening is 20-45 degrees.

Preferably, a check door is installed between the transition flange and the communicating pipe, and the size of the check door is matched with the size of the embedded opening.

Preferably, the upper end of the communicating pipe is provided with a mounting groove for fixing the check door.

Preferably, a gap is provided between the insert and the inner wall of the mixing end.

Preferably, one end of the end cover, which is opposite to the communicating pipe, is provided with at least one groove for installing a sealing ring.

The second purpose of the utility model is realized by adopting the following technical scheme:

a gas boiler comprises the air inlet connecting assembly.

Compared with the prior art, the utility model has the beneficial effects that:

according to the air inlet connecting assembly, the end cover, the communicating pipe, the transition flange and other assemblies are arranged, so that the traditional integrated end cover is replaced, the end cover is arranged on the combustion chamber, the mounting flange of the burner is clamped between the end cover and the communicating pipe, mixed gas is better input into the burner from the communicating pipe, the first heat insulation pad is arranged between the end cover and the burner to obstruct heat transfer between the combustion chamber and the mounting flange of the burner or between the communicating pipe, and the second heat insulation pad is used for obstructing heat between the communicating pipe and the transition flange, so that the mixed gas in the communicating pipe is preheated by the heat, and therefore heat generated by combustion of the mixed gas is further transferred to the fan.

Drawings

FIG. 1 is a schematic view of an air intake connection assembly and burner combination according to a preferred embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the end cover of FIG. 1 in combination with a combustor;

fig. 3 is an enlarged view at a shown in fig. 2;

FIG. 4 is a cross-sectional view of the communication tube of FIG. 1 in combination with a transition flange;

FIG. 5 is an exploded view of the communication tube of FIG. 4 after being coupled to a transition flange;

fig. 6 is another angular cross-sectional view of the communication tube shown in fig. 5.

In the figure: 100. an air inlet connection assembly; 10. an end cap; 11. a first insulation mat; 12. a slot; 20. a communicating pipe; 21. a fixed end; 22. a mixing end; 220. a first mixing chamber; 221. a second mixing chamber; 222. a mounting groove; 23. a connection end; 24. a second insulation mat; 30. a transition flange; 31. an embedding part; 40. a check door; 200. a burner.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the description of the present utility model, it will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

Referring to fig. 1-6, an intake connection assembly 100 according to a preferred embodiment of the present utility model is used for connecting a burner 200 and a fan, delivering a mixed gas of fuel gas and air to the burner 200, igniting and burning in the combustion chamber, and specifically, the intake connection assembly 100 includes an end cover 10, a communicating pipe 20 connected to the end cover 10, and a transition flange 30; the middle part of the end cover 10 is provided with a mounting hole for the burner 200 to pass through, one end of the end cover 10 facing the communicating pipe 20 is provided with an abutting groove for the mounting flange of the burner 200 to abut, and a first heat insulation pad 11 is arranged in the abutting groove; the communicating pipe 20 includes stiff end 21, mixing end 22 and link 23, stiff end 21 is used for cooperating end cover 10 in order to fixed mounting combustor 200, and mixing end 22 is the step-by-step setting along the air current direction, is equipped with second heat insulating mattress 24 between link 23 and the transition flange 30, and transition flange 30 is used for linking to each other with the fan. In one embodiment, the end cover 10 is mounted on the combustion chamber, and the fixed end 21 and the connecting end 23 are flanges for respectively butt-jointing the end cover 10 and the transition flange 30 so as to be well jointed. The end cover 10, the communicating pipe 20, the transition flange 30, the burner 200 and the fan are all connected through bolts.

The above-mentioned inlet connection assembly 100 replaces the traditional integral type end cover 10 through being equipped with the end cover 10, communicating pipe 20 and transition flange 30 etc. and installs end cover 10 on the combustion chamber, and rethread is with the flange centre gripping of installing of combustor 200 between end cover 10 and communicating pipe 20, make the mixed gas input to combustor 200 in from communicating pipe 20 better, place between end cover 10 and combustor 200 through first insulating pad 11, with the heat transfer between the flange of separating combustion chamber and combustor 200 or the communicating pipe 20, the effect of rethread second insulating pad 24, heat between communicating pipe 20 and transition flange 30 is kept off, make this part heat preheat the mixed gas in the communicating pipe 20, thereby reduced the heat that the mixed gas burns and further transferred to the fan, simultaneously, the structure setting of communicating pipe 20 can make gas and air mix fully, make the mixed gas burn fully in the combustion chamber, further improve the thermal efficiency of boiler.

In one embodiment, as shown in fig. 6, the mixing end 22 has a first mixing chamber 220 and a second mixing chamber 221, the first mixing chamber 220 is arranged in a circular shape, the second mixing chamber 221 is arranged in a square shape, that is, the mixed gas is gradually transited from the square-shaped second mixing chamber 221 to the circular-shaped first mixing chamber 220, so as to match with the structural arrangement of the fan and the burner 200, and make the mixed gas stably input. Meanwhile, the mixing end 22 is gradually increased along the air flow direction, so that the flow rate of the mixed gas is further slowed down, and the mixed gas can be fully mixed before being combusted in the combustion chamber.

As shown in fig. 4 and 5, the transition flange 30 is provided with an embedding part 31, the embedding part 31 is used for being embedded into the second mixing cavity 221, so that the transition flange 30 forms a transition section between the fan and the communicating pipe 20, and mixed gas is gradually introduced into the communicating pipe 20, wherein one end of the embedding part 31, which is close to the communicating pipe 20, is provided with an embedding opening, and the embedding opening is obliquely arranged from bottom to top, namely, the embedding opening is an inclined opening; the check door 40 is installed between the transition flange 30 and the communication pipe 20, the size of the check door 40 is matched with the size of the embedded opening, the check door 40 forms a turbulent flow effect between the communication pipe 20 and the transition flange 30, and meanwhile, when the backfire phenomenon of the burner 200 occurs, the reverse flow of air flow can be prevented in time, so that the safety of equipment is further improved. In one embodiment, the embedded opening is inclined at an angle of 20-45 degrees, so that the embedded opening is opened when the air flows in the forward direction and closed when the air flows in the reverse direction. As shown in fig. 6, the upper end of the communication pipe 20 is provided with a mounting groove 222 for fixing the check door 40, so that the check door 40 can be well fixed to the communication pipe 20. The insert 31 has a gap with the inner wall of the mixing end 22 so that the mixed gas can form part of the buffer action in the mixing end 22.

As shown in fig. 2 and 3, at least one groove 12 for installing a sealing ring is formed at one end of the end cover 10 facing away from the communicating pipe 20, and the sealing performance of the end cover 10 installed on the combustion chamber is improved by installing the sealing ring, and in this embodiment, the number of the grooves 12 is 2.

In some embodiments, a third insulation pad is also installed between the transition flange 30 and the fan to further enhance the insulation effect.

In this embodiment, the first heat insulation pad 11, the second heat insulation pad 24 and the third heat insulation pad are all made of aluminum silicate high temperature resistant fiber board materials.

In other embodiments, the present utility model further provides a gas boiler, which includes the above-mentioned air inlet connection assembly 100, and the burner 200 and the fan are connected through the air inlet connection assembly 100, so that the gas and the air are fully mixed, the mixed gas is fully combusted in the combustion chamber, and the thermal efficiency of the boiler is further improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. An air inlet connecting assembly for connecting a burner and a fan is characterized by comprising an end cover, a communicating pipe for connecting the end cover and a transition flange; the middle part of the end cover is provided with a mounting hole for the burner to pass through, one end of the end cover, which faces the communicating pipe fitting, is provided with an abutting groove for the mounting flange of the burner to abut, and a first heat insulation pad is arranged in the abutting groove; the communicating pipe comprises a fixed end, a mixed end and a connecting end, wherein the fixed end is used for being matched with the end cover to fixedly install the combustor, the mixed end is gradually increased along the air flow direction, a second heat insulation pad is arranged between the connecting end and the transition flange, and the transition flange is used for being connected with the fan.

2. The air intake connection assembly of claim 1, wherein the mixing end has a first mixing chamber and a second mixing chamber, the first mixing chamber being circularly shaped and the second mixing chamber being squarely shaped.

3. The air inlet connection assembly of claim 2, wherein the transition flange is provided with an insert for insertion into the second mixing chamber.

4. An air inlet connection assembly according to claim 3, wherein the embedded part is provided with an embedded opening which is obliquely arranged from bottom to top.

5. The air intake connection assembly of claim 4, wherein the recessed inlet is angled at 20 ° -45 °.

6. The intake connection assembly of claim 4, wherein a check door is mounted between the transition flange and the communication tube, the check door sized to fit the size of the recessed inlet.

7. The intake connection assembly according to claim 6, wherein an upper end of the communication pipe is provided with a mounting groove for fixing the check door.

8. The air intake connection assembly of claim 3, wherein a gap is provided between the insert and an inner wall of the mixing end.

9. The air inlet connection assembly according to claim 1, wherein the end of the end cap facing away from the communication tube is provided with at least one groove for mounting a sealing ring.

10. A gas boiler comprising an inlet connection assembly according to any one of claims 1-9.