CN211694988U

CN211694988U - Ignition needle, combustor adopting same and wall-mounted furnace

Info

Publication number: CN211694988U
Application number: CN202020143600.4U
Authority: CN
Inventors: 许成骅; 田杰
Original assignee: Bosch Thermotechnology Shanghai Co Ltd
Current assignee: Bosch Thermotechnology Shanghai Co Ltd
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2020-10-16
Anticipated expiration: 2030-01-21

Abstract

The application discloses ignition needle and adopt combustor and hanging stove of this ignition needle. The ignition needle comprises a body (100) and a protective cover (200), wherein the body (100) is provided with an ignition needle main body (110) and a pair of ignition electrodes (120) extending from the top of the ignition needle main body, the protective cover (200) is arranged at the top of the ignition needle main body (110) and is provided with a cavity for accommodating the ignition electrodes (120), a pair of windows (211 and 221) penetrating through the protective cover are formed in a top surface (210) and a bottom surface (220) opposite to the top surface of the protective cover (200), and ignition ends (121 and 122) of the ignition electrodes accommodated in the cavity of the protective cover are exposed in the pair of windows (211 and 221).

Description

Ignition needle, combustor adopting same and wall-mounted furnace

Technical Field

The application relates to the technical field of burners, in particular to an ignition needle, a burner adopting the ignition needle and a wall-mounted furnace.

Background

At present, the wall-mounted gas boiler on the market mostly adopts a pulse ignition mode to ignite gas, and converts low voltage into high voltage of 10 to 15KV through a booster circuit, so that 3 to 5 sparks are generated per second. The time to diffuse from one spark point to the fully combustible region is about 0.3 seconds. When the gas burner is ignited, the ignition end of the ignition electrode on the ignition needle generates instant high potential to break down the metal piece air near the ignition hole to generate ionization, so that the gas sprayed out from the gas hole is ignited.

At present, the wall-mounted furnace on the market mostly adopts the mode of partially premixing air and gas to burn, and the mist sprays out from the flame hole of combustor, has certain gas secondary pressure, and the velocity of flow is very fast. In extremely cold areas, due to the influence of low temperature, the high flow rate of the mixed gas during spraying out often blows out the sparks of the exposed ignition needle to cause ignition failure.

In addition, in extremely cold areas, due to the fact that the water inlet temperature is very low, condensate water is easy to generate in the combustion chamber, and the dropped condensate water can block the flame holes, so that ignition failure is caused. Meanwhile, when the gas is lost due to multiple ignition failures, the local gas concentration is too high to cause deflagration, and potential safety hazards exist. In summary, the ignition needle structure of the existing wall-mounted gas boiler needs to be further optimized to enhance the success rate of one-time ignition of the wall-mounted gas boiler product.

SUMMERY OF THE UTILITY MODEL

It is an object of the present application to provide an ignition needle that solves the problems of the prior art.

The application discloses ignition needle, including body and safety cover, the body has ignition needle main part and certainly a pair of ignition electrode that ignition needle main part top extended out, the safety cover sets up ignition needle main part top just has the holding ignition electrode's cavity, the top surface of safety cover and with a pair of lining up has been seted up to the bottom surface that the top surface is relative the window of safety cover for the holding in the cavity of safety cover ignition electrode's ignition end exposes two in the window.

In a possible embodiment, the window is a rectangle having a length of 8-10 mm and a width of 2-3 mm.

In a possible embodiment, the protective cover is made of a ceramic material.

In a possible embodiment, the bottom surface of the protective cover is further provided with a plurality of holes.

In a feasible embodiment, the diameter of each hole is 1-1.5 mm.

In a feasible embodiment, the distance between two adjacent holes is 3-4 mm.

In a possible embodiment, the ignition needle body is provided integrally with the protective cover.

In a possible embodiment, the firing ends of the firing electrodes are bent in a direction parallel to the top surface of the protective cover and are close to each other without contacting each other, and the angle of extension between the two firing ends is 30 degrees.

The application also discloses a combustor, the combustor adopts aforementioned ignition needle.

The application further discloses a hanging stove, this hanging stove adopts as before the combustor.

For a better understanding of the nature and technical content of the present application, reference should be made to the following detailed description and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the present application.

Drawings

The foregoing and other aspects of the present application will be more fully understood and appreciated by reference to the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of one embodiment of the present application;

fig. 2 is a schematic structural view of the body of the ignition needle;

fig. 3 is a schematic view of the embodiment of fig. 1 from another angle.

Detailed Description

To assist those skilled in the art in understanding the subject matter claimed herein, specific embodiments thereof are described below in detail with reference to the accompanying drawings.

Referring to fig. 1 to 3, an ignition needle 10 includes a body 100 and a protective cover 200, wherein the body 100 has an ignition needle main body 110 and a pair of ignition electrodes 120 extending from the top of the ignition needle main body 110, and those skilled in the art understand that the tips of the ends of the ignition electrodes 120 are

ignition tips

121, 122 for generating an electric spark required for ignition. The operation principle of the pair of ignition electrodes 120, one of which is a positive electrode and the other of which is a negative electrode, is well known to those skilled in the art and will not be described herein. The protective cover 200 is disposed on the top of the ignition needle body 110 and has a cavity for accommodating the ignition electrode 120, and a pair of

windows

211, 221 penetrating through the protective cover are opened on the top surface 210 and the bottom surface 220 opposite to the top surface 210 of the protective cover 200, so that the ignition ends 121, 122 of the ignition electrode accommodated in the cavity of the protective cover 200 are exposed in the two windows 211, 212.

In the present embodiment, the

windows

211 and 221 are rectangular, and the length of the rectangle is 8 to 10mm, and the width of the rectangle is 2 to 3 mm. In order to ensure that the material is resistant to flame and high temperature, the protective cover 200 and the ignition needle body 110 are made of ceramic materials, and the ignition needle body 110 and the protective cover 200 are integrally formed. When the electric spark is generated, because the windows 211 and 212 of the protective cover 200 surround the exposed ignition electrode 120 on four sides, the influence of the external air flow on the high-temperature spark is reduced, and the ignition success rate is improved.

In some embodiments, the bottom surface 220 of the protective cover 200 is further provided with holes or grids. For example, in fig. 1, a hole 222 is shown. During ignition, high-speed mixed gas sprayed from the burner flame holes passes through holes or grids on the bottom surface and is blocked by the top surface 210 to form local turbulence, so that the flow rate of the mixed gas is greatly reduced, the influence of airflow on high-temperature sparks is further reduced, and the ignition success rate is improved. Since holes or grids are provided only on the bottom surface 220 of the protective cover 200 and the top surface 210 is not perforated at the opposite position, this scheme reduces the occurrence of a situation where the ignition electrode cannot be successfully discharged due to the dropping of condensed water and a situation where the flame holes are clogged with dust. In a preferred embodiment, the diameter of each hole 222 is 1 to 1.5mm, and the distance between two adjacent holes 222 is 3 to 4 mm.

In some embodiments, the two firing ends 121, 122 of the firing electrode extend toward each other in a direction parallel to the top surface 210 of the protective cover without contacting each other, and an extension line between the two

firing ends

121, 122 has an angle of 30 degrees. The design shortens the distance between the ignition ends, is beneficial to improving the electric arc intensity and the ionization temperature, and helps ignition.

As can be understood by persons in the field, the ignition needle adopting the scheme can reduce the speed of gas sprayed out of the flame holes of the burner, reduce the heat dissipation rate of local high-temperature sparks and even prevent condensed water from dripping, and improves the ignition success rate. The same effect can be obtained by the burner and the wall-mounted gas stove which adopt the ignition needle. Specifically, the combustor provided with the ignition needle comprises a premixing channel of gas and air, an inflow channel of secondary air, a plurality of fire discharge sheets arranged in parallel and a bracket for fixing the fire discharge sheets. The ignition needle is arranged in a channel between the first fire row sheet and the second fire row sheet, and a lead of the ignition needle is led out to the lower part of the combustor. This application is through setting up the safety cover in ignition electrode department, and when burner flame hole spun high-speed gas mixture met hole or latticed hole baffle (the bottom surface of safety cover) and the top surface of sclausura baffle (safety cover), can form the torrent in two electric arc generation departments between the ignition electrode, has also reduced electric arc radiating rate when reducing the air current velocity of flow to ignition success rate has been improved greatly. Meanwhile, as the top surface of the protective cover has no hole except the window, the condition that the discharge is influenced by the dropping of condensed water is reduced.

Although the application has been illustrated and described herein with reference to specific embodiments, the application is not intended to be limited to the details shown. Rather, various details of the application may be modified within the scope and equivalents of the claims.

Claims

1. An ignition needle is characterized by comprising a body (100) and a protective cover (200), wherein the body (100) is provided with an ignition needle main body (110) and a pair of ignition electrodes (120) extending from the top of the ignition needle main body, the protective cover (200) is arranged at the top of the ignition needle main body (110) and is provided with a cavity for accommodating the ignition electrodes (120), a pair of windows (211, 221) penetrating through the protective cover are formed in the top surface (210) and the bottom surface (220) opposite to the top surface of the protective cover (200), and ignition ends (121, 122) of the ignition electrodes accommodated in the cavity of the protective cover are exposed in the pair of windows (211, 221).

2. An ignition needle as claimed in claim 1, wherein said window (211, 221) is rectangular, having a length of 8 to 10mm and a width of 2 to 3 mm.

3. An ignition needle as claimed in claim 1, characterized in that said protective shield (200) is of a ceramic material.

4. An ignition needle as claimed in claim 1, characterized in that the bottom surface (220) of said protective shield is further provided with holes (222) or a grid.

5. An ignition needle as claimed in claim 4, characterized in that each of said holes (222) has a diameter of 1 to 1.5 mm.

6. The ignition needle as claimed in claim 5, wherein a spacing between two adjacent holes (222) is 3 to 4 mm.

7. The ignition needle of claim 1, wherein said ignition needle body (110) is integrally formed with said protective shield (200).

8. The ignition needle of claim 1, wherein the firing tips (121, 122) of said firing electrodes extend toward each other in a direction parallel to the top surface (210) of the shield without contacting each other, and the angle between the extension lines of said firing tips is 30 degrees.

9. A burner, characterized in that it employs an ignition needle as claimed in any one of claims 1 to 8.

10. A wall hanging stove, characterized in that the wall hanging stove employs the burner as claimed in claim 9.