CN201050787Y

CN201050787Y - Gas mixer

Info

Publication number: CN201050787Y
Application number: CNU2007200663382U
Authority: CN
Inventors: 冯良
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-15
Filing date: 2007-01-15
Publication date: 2008-04-23
Anticipated expiration: 2017-01-15

Abstract

The utility model discloses a gas mixing device, which comprises a valve body composed of a valve cavity, a first gas inlet, a second gas inlet and a gas outlet, wherein the valve cavity is provided with a first flared tube and a second flared tube, the small end of the first flared tube is opposite the small end of the second flared tube, the large end of the first flared tube is the gas inlet, the second gas inlet is communicated with the valve cavity, and the large end of the second flared tube is the gas outlet. The utility model has the advantages in simple structure, better mixing effect and low air pressure demand.

Description

Gas mixer

Technical field

The utility model relates to a kind of gas mixer.

Background technology

Full premix combustion is at the inner combustion gas-air mixture that mixes fully that forms of burner, and promptly its primary air ratio is more than or equal to 1, and mixture forms short and anxious thermal-flame in burner tip inside or in its exit burning.Full premix combustion has following advantage:

1. can realize completing combustion under near 1 condition at excess air coefficient, and can obtain enough high temperature;

2. flame is extremely short, and combustion intensity is big;

3. because the preceding gas-air of burning is able to abundant mixing, and burning is complete, pollutant discharge amount is low in the flue gas.

The key that realizes full premix combustion is the burner head technology, and the GAS blender is the assurance that realizes full premix combustion.

All-premixing burner generally can be divided into injection type and blowing-type two classes according to the air fuel gas hybrid mode.So-called injection type is exactly the pressure energy that injector utilizes combustion gas, entrainments enough air, makes its mixing.Injector itself has the function that ratio is regulated, and promptly under different loading condictions, can guarantee the ratio basically identical of gas flow and air mass flow.Require characteristics such as height, structure heaviness owing to the injector that is used for full premix combustion has gaseous-pressure, therefore be subjected to certain use restriction.The blowing-type blender generally is made up of Venturi tube and zero-pressure pressure regulator, and its cardinal principle is that the pressure-air that utilizes air blast to produce forms negative pressure suction combustion gas in throat's flow at high speed of Venturi tube.This system has the function that ratio is regulated equally, but shortcoming is to need high pressure positive blower, and the pressure loss is big, and blast requires high.General Venturi tube is owing to the unilateral import of combustion gas side direction, and combustion gas and air need one section long mixer could guarantee to mix.

The utility model content

The utility model is in order to overcome deficiency of the prior art, and a kind of simple for structure, good mixing effect, the low full premix combustion gas mixer of blast requirement are provided.

For achieving the above object, the utility model is achieved through the following technical solutions:

Gas mixer, comprise valve body, valve body comprises valve pocket, first air inlet, second air inlet and gas outlet, be provided with first oviduct and second oviduct in the valve pocket, the small end of first oviduct is relative with the small end of second oviduct, first horn-tube main aspect is an air inlet, and second air inlet communicates with valve pocket, and the big end of second oviduct is the gas outlet.

Wherein, the described first oviduct small end is positioned at second oviduct, is annular space between first oviduct and second oviduct.

Wherein, described first air inlet and the second air inlet axis normal.

Wherein, also include the air pressure-measuring pipe, the air pressure-measuring pipe communicates with first oviduct, is preferably the air pressure-measuring pipe and is communicating near the first horn-tube main aspect import department with first oviduct.

The beneficial effects of the utility model are, simple for structure, good mixing effect, blast require low.

Description of drawings

Fig. 1 is the utility model three-dimensional structure diagram;

Fig. 2 is the revolved sectional view of Fig. 1.

Fig. 3 is the utility model application example schematic diagram.

The specific embodiment

Further the utility model is further specified below in conjunction with embodiment and accompanying drawing.

As Fig. 1, shown in Figure 2, gas mixer, comprise valve body 1, valve body 1 comprises valve pocket 2, first air inlet 3, second air inlet 4 and gas outlet 5, be provided with first oviduct 6 and second oviduct 7 in the valve pocket 2, first oviduct, 6 small ends are positioned at second oviduct 7, the big end of first oviduct 6 is first air inlet 3, second air inlet 4 communicates with valve pocket 5, first air inlet 3 and second air inlet, 4 axis normal, also include air pressure-measuring pipe 8 and communicating near the first horn-tube main aspect import department, be used to measure air and the preceding air pressure of combustion gas mixing with first oviduct 6.During use, first air inlet 3 is as air intlet, and second air inlet 4 is as fuel gas inlet, is used for exporting after the mixing of air and combustion gas.

The utility model uses and implements illustration as shown in Figure 3, the utility model is worked with the combustion gas proportional controller, combustion system is by blower fan 17, air butterfly valve 16, gas filter 9, magnetic valve 10, compositions such as gas pressure regulating valve 18, gas control valve 12, gas mixer 15, all-premixing burner (not marking among the figure), ignitor 13, flame ion probe 14.

Burning required air flow V _AProvide through air butterfly valve 16 adjustings by blower fan 17, also available interchange of blower fan 17 or DC frequency-changing blower fan are controlled as required, air pressure signal before blender send gas pressure regulating valve 18 through pressure-measuring pipe, combustion gas is sent blender through filter 9, magnetic valve 10, gas pressure regulating valve 18, gas control valve 12, and gas pressure regulating valve 18 adjusted screws 11 can be adjusted gas outlet P _O1With air pressure P _ADeviant, promptly guarantee P _A-P _O1Be constant, the gas control valve on the pipeline is regulated the pressure ratio of combustion gas/air, can keep P _O-P _m/ P _A-P _mBe constant (P _OBe blender fuel gas inlet pressure, P _mBe burner head pressure) because the design feature of this novel practical can guarantee V all the time _g/ V _A(V _gBe gas flow) the ratio unanimity, do not change with air mass flow.

Combustion system at first starts blower fan and carries out preceding purging, after purge time finishes, burner is connected ignitor and is opened gas electromagnetic valve, light a fire, behind the certain safety time (4～6 seconds) of process, the signal of flame detection ion probe is if detect less than flame, then close gas electromagnetic valve, and carry out post-purge.Exist if detect flame, then keep magnetic valve and open state, keep the burner operate as normal.In case the flame-out phenomenon of appearance is then closed gas electromagnetic valve, and carried out post-purge, guarantee safety in the combustion process.

By the aperture (manual or driven by servomotor) of adjusting air butterfly valve, just can regulate the thermal output of burner as required, reach the purpose of control furnace temperature.

The foregoing description only is used for the utility model is described, and does not constitute the restriction to the claim scope, and other substantial equivalence means that it may occur to persons skilled in the art that are all in the utility model claim scope.

Claims

1. gas mixer, comprise valve body, valve body comprises valve pocket, first air inlet, second air inlet and gas outlet, it is characterized in that, be provided with first oviduct and second oviduct in the valve pocket, the small end of first oviduct is relative with the small end of second oviduct, and first horn-tube main aspect is an air inlet, second air inlet communicates with valve pocket, and the big end of second oviduct is the gas outlet.

2. gas mixer according to claim 1 is characterized in that, the described first oviduct small end is positioned at second oviduct, is annular space between first oviduct and second oviduct.

3. gas mixer according to claim 1 is characterized in that, described first air inlet and the second air inlet axis normal.

4. gas mixer according to claim 1 is characterized in that, also includes the air pressure-measuring pipe, and the air pressure-measuring pipe communicates with first oviduct.