CN110906327A

CN110906327A - Adjustable fuel ratio venturi

Info

Publication number: CN110906327A
Application number: CN201911085873.6A
Authority: CN
Inventors: 徐展; 陈健; 徐维强; 许立锟; 张梦伟
Original assignee: Fulton Group NA Inc
Current assignee: Hangzhou Fulton Thermal Energy Equipment Co Ltd; Fulton Group NA Inc
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-03-24

Abstract

The invention discloses a combustion ratio adjustable Venturi tube, which comprises a mixing pipeline, a gas channel and an air channel which are respectively communicated with the mixing pipeline, and an adjustable discharge rod arranged on the mixing pipeline; the relative position of the adjustable discharge rod and the mixing pipeline is adjusted, so that the air-fuel ratio in the mixing pipeline is adjusted. Among the above technical scheme, air and gas mix in getting into the mixing tube through air passage and gas passage respectively, then get into the combustion chamber and burn, and wherein adjustable discharge capacity stick is used for the air-fuel ratio of air and gas to make the air-fuel ratio in the combustion chamber reach suitable scope, and reduce the nitrogen oxide in the burning production flue gas, slow down the harmful effects that cause the environment.

Description

Venturi tube with adjustable combustion ratio

Technical Field

The invention relates to the field of smoke emission, in particular to a combustion ratio adjustable Venturi tube.

Background

When the fluid passes through the reduced flow cross section, the flow velocity of the fluid is increased, the flow velocity of the fluid is inversely proportional to the flow cross section, and a special pipeline manufactured by utilizing the phenomenon is a venturi tube.

Venturi tubes are widely used in the delivery of various fluids, including the use of venturi tubes for the delivery of combustion gases, due to their simple principle and ease of implementation. Venturi tubes in the prior art can not adjust the air-fuel ratio of air and gas generally, air and gas are directly conveyed to a combustion chamber, the content ratio of the air and the gas in the combustion chamber can not be adjusted, and nitrogen oxides in smoke generated by combustion are more, so that adverse effects are caused to the environment.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a combustion ratio adjustable Venturi tube.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a combustion ratio adjustable Venturi tube comprises a mixing pipeline, a gas channel and an air channel which are respectively communicated with the mixing pipeline, and an adjustable discharge rod arranged on the mixing pipeline; the relative position of the adjustable discharge rod and the mixing pipeline is adjusted, so that the air-fuel ratio in the mixing pipeline is adjusted. Among the above technical scheme, air and gas mix in getting into the mixing tube through air passage and gas passage respectively, then get into the combustion chamber and burn, and wherein adjustable discharge capacity stick is used for the air-fuel ratio of air and gas to make the air-fuel ratio in the combustion chamber reach suitable scope, and reduce the nitrogen oxide in the burning production flue gas, slow down the harmful effects that cause the environment.

Preferably, the mixing pipeline comprises a first cavity and a second cavity communicated with the first cavity, a first channel is arranged between the first cavity and the second cavity, the adjustable displacement rod penetrates through the first channel and is arranged on a shell of the second cavity, the first channel is communicated with the fuel gas channel, and the second cavity is communicated with the air channel. Among the above technical scheme, the gas passes through the gas passageway and gets into first passageway, and then gets into first cavity, and the air passes through air channel and gets into the second cavity and get into first cavity through first passageway to gas and air mix and get into the combustion chamber and burn in first cavity. The adjustable exhaust rod is slidably arranged on the shell of the second cavity, the adjustable exhaust rod slides to change the position relation between the adjustable exhaust rod and the first channel, so that the gap between the adjustable exhaust rod and the first channel is changed, the communication degree between the first cavity and the second cavity is changed, the Venturi effect is generated, the pressure difference between the gas inlet pressure and the gas pressure in the first channel is changed, the air inflow of the gas entering the first cavity in unit time is adjusted, the air-fuel ratio of the mixed gas in the first cavity reaches a proper range and enters the combustion chamber to be combusted, the air-fuel ratio in the combustion chamber reaches a proper range, the nitrogen oxide in the flue gas generated by combustion is reduced, and the adverse effect on the environment is relieved. The air inlet pressure of the fuel gas can be set to a fixed value by an air pressure regulating valve, and the air inlet quantity can be controlled to a fixed value by an external air pump.

Preferably, the adjustable discharge rod comprises a cylinder body which is slidably arranged on the second chamber shell and an adjusting rod which is connected with the cylinder body into a whole, the adjusting rod penetrates through the first channel, and the diameter of the first channel is larger than that of the adjusting rod. Among the above technical scheme, the cylinder slides on the second cavity casing to drive the regulating rod and change the position relation between regulating rod and the first passageway, thereby change the space between regulating rod and the first passageway, thereby change the degree of intercommunication between first cavity and the second cavity, thereby produce the venturi effect, changed the gas pressure difference, thereby adjust the gas input that the gas got into first cavity in the unit interval, thereby adjust the air-fuel ratio of the interior gas mixture of first cavity. First passageway diameter is greater than the diameter of regulating rod to make and have the space between regulating rod and the first passageway all the time, make first cavity and second cavity remain the intercommunication all the time, thereby make and have the air to enter into to first cavity from the second cavity all the time, thereby make the gas concentration in the first cavity be less than predetermined safe value, reduced the risk that the gas concentration was too high to be brought in the first cavity.

Preferably, the conditioning rod comprises a tapered rod passing through a first passage, the diameter of the first passage being greater than the maximum diameter of the tapered rod. Among the above technical scheme, the cylinder slides on the second cavity casing to drive the toper stick and change the position relation between toper stick and the first passageway, thereby change the space between toper stick and the first passageway, thereby change the degree of intercommunication between first cavity and the second cavity, thereby produce the venturi effect, changed the gas pressure difference, thereby adjust the gas inflow that the gas got into first cavity in the unit interval, thereby adjust the air-fuel ratio of the interior gas mixture of first cavity. The diameter of first passageway is greater than the biggest diameter of toper stick to make and have the space all the time between regulating rod and the first passageway, make first cavity and second cavity remain the intercommunication all the time, thereby make all the time have the air to enter into to first cavity from the second cavity, thereby make the gas concentration in the first cavity be less than predetermined safe value, reduced the risk that the gas concentration was too high and is brought in the first cavity. The sliding distance of the cylinder on the second chamber shell and the gap between the conical rod and the first channel have quantitative relation, so that the conical rod is convenient for quantitatively adjusting the air-fuel ratio in the first chamber.

Preferably, one end of the conical rod is connected with the column body, the other end of the conical rod extends into the first cavity, and the diameter of the end, connected with the column body, of the conical rod is larger than that of the other end of the conical rod. In the technical scheme, when the cylinder body is pulled away from the second chamber shell, the gap between the conical rod and the first channel is increased, so that the amount of fuel gas entering the first chamber is increased, and the content of fuel gas in the first chamber is increased; when the cylinder is pushed towards the second chamber housing, the gap between the tapered rod and the first channel is reduced, so that the amount of gas entering the first chamber is reduced, and the gas content in the first chamber is reduced. The diameter of the end of the tapered rod connected with the cylinder is larger than that of the other end of the tapered rod, so that the tapered rod is connected with the cylinder more firmly.

Preferably, the second chamber housing is provided with a second channel for sliding the cylinder. Among the above technical scheme, the cylinder is passed in and out in the second passageway and is slided to drive the toper stick and change the position relation between toper stick and the first passageway, thereby change the space between toper stick and the first passageway, thereby change the degree of intercommunication between first cavity and the second cavity, thereby adjust the content that the gas got into first cavity, thereby adjust the air-fuel ratio of first cavity.

Preferably, the adjustable fuel ratio venturi of the present invention further comprises a motor coupled to the post. In the technical scheme, the motor comprises the servo motor, the high-precision servo motor is used, the relative position of the conical rod and the first channel can be automatically adjusted in a stepless mode, so that the gap between the conical rod and the first channel is changed, the air inflow of gas is changed under the condition that the gas inflow pressure and the air inflow are kept fixed, the purpose of controlling the air-fuel ratio in the first cavity is achieved, and the air-fuel ratio in the first cavity reaches the accurate required range.

Preferably, a motor shaft of the motor is connected with the cylinder through a connecting structure. Among the above technical scheme, through the translation motion of connection structure with the rotational motion conversion of motor shaft to the cylinder, through the translation motion of cylinder to realize that the cylinder slides in the second passageway, thereby drive the toper stick translation and change the space between toper stick and the first passageway, thereby adjust the air-fuel ratio in the first cavity.

Preferably, the connecting structure comprises a first connecting strip fixedly arranged on the motor shaft, a second connecting strip rotatably arranged on the first connecting strip, and a third connecting strip rotatably arranged on the second connecting strip, and the third connecting strip is rotatably connected with the column body. Among the above technical scheme, first connecting strip is fixed to be established perpendicularly on the motor shaft, when the motor shaft rotates, first connecting strip rotates around the motor shaft, thereby first connecting strip drives the second connecting strip and rotates and take place the displacement, thereby the second connecting strip drives the third connecting strip and rotates and take place the displacement, the third connecting strip links to each other with the second connecting strip and follows the second connecting strip and takes place the displacement motion, thereby the third connecting strip drives the cylinder translation, thereby it shifts and changes the space between toper stick and the first passageway to drive the toper stick, thereby adjust the air-fuel ratio in the first cavity.

Further, the relationship between the intake air amount per unit time and the displacement amount of the tapered rod is:

wherein Q is_nThe current gas inflow is Q ', the original gas inflow is Q', and A is the displacement of the conical rod.

Further, the different displacement amounts of the conical rod are adjusted according to the stable air intake amount and the stable gas pressure intake in unit time, and the gas pressure and the gas intake speed of the first channel corresponding to the different displacement amounts of the conical rod are respectively measured. Further, the air intake amount per unit time is simulated at a stable air intake speed of 3.08m/s, the gas intake pressure is stable to be 1.3Kpa, the distance between the discharge rod and the outlet of the first chamber is taken as the displacement amount of the tapered rod, and the gas pressure and the gas intake speed at the first passage are measured when the displacement amount of the tapered rod is 7mm, 12mm and 17mm, respectively, so that a relation between the air intake amount per unit time of the gas and the displacement amount of the tapered rod is fitted. The corresponding table of the gas pressure and the gas inlet speed at the corresponding first passage when the displacement of the conical rod is respectively 7mm, 12mm and 17mm is shown as the following table:

displacement of conical rod	Gas pressure at the first passage	Gas velocity at the first passage
			7mm	1032.65pa	9.707m/s
12mm	1065.56pa	9.607m/s
			17mm	1050.22pa	9.356m/s

Under the condition that the air inlet pressure of the fuel gas and the air inlet speed of the air are not changed, because of the conical shape of the conical rod, the displacement of the conical rod is changed, so that the gap between the conical rod and the first channel is changed, different Venturi effects are caused, the pressure difference between the air inlet pressure of the fuel gas and the pressure difference at the first channel is changed, the air inlet quantity of the fuel gas in unit time is changed, the air inlet quantity of the air in unit time is kept unchanged, and the air-fuel ratio in the first cavity is adjusted according to the change of the air inlet quantity of the fuel gas in unit time. And fitting a relational expression between the gas inlet amount and the displacement amount of the conical rod according to the above, and accurately controlling the air-fuel ratio in the first cavity according to the relational expression between the gas inlet amount and the displacement amount of the conical rod.

The invention has the beneficial effects that:

the adjustable fuel ratio venturi tube can adjust the air-fuel ratio of the venturi tube to enable the air-fuel ratio to reach a proper range, reduce the content of nitric oxide in flue gas generated by combustion and reduce adverse effects on the environment.

Drawings

FIG. 1 is a schematic diagram of the construction of the adjustable fuel ratio venturi of the present invention;

FIG. 2 is a schematic cross-sectional view of the adjustable fuel ratio venturi of the present invention;

FIG. 3 is a schematic view of the adjustable fuel ratio venturi of the present invention in connection with a motor.

In the figure: 1. mixing pipe, 11, first chamber, 12, second chamber, 121, second passageway, 13, first passageway, 2, gas passageway, 3, air passageway, 4, adjustable displacement stick, 41, regulating rod, 411, toper stick, 42, cylinder, 5, motor, 51, motor shaft, 6, first connecting strip, 7, second connecting strip, 8, third connecting strip.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and embodiments.

As shown in fig. 1-3, the adjustable fuel ratio venturi tube of the present invention comprises a mixing pipe 1, a fuel gas channel 2 and an air channel 3 respectively communicated with the mixing pipe 1, and an adjustable discharge rod 4 disposed on the mixing pipe 1; the air-fuel ratio in the mixing pipe 1 is adjusted by adjusting the relative position of the adjustable displacement rod 4 and the mixing pipe 1.

In this embodiment, the mixing duct 1 includes a first chamber 11 and a second chamber 12 communicated with the first chamber 11, a first channel 13 is provided between the first chamber 11 and the second chamber 12, the adjustable discharge rod 4 passes through the first channel 13 and is provided on a housing of the second chamber 12, the first chamber 11 is communicated with the gas channel 2, and the second chamber 12 is communicated with the air channel 3.

In this embodiment, the adjustable displacement rod 4 comprises a cylinder 42 slidably disposed on the housing of the second chamber 12, and an adjusting rod 41 integrally connected to the cylinder 42, wherein the adjusting rod 41 passes through the first passage 13, and the diameter of the first passage 13 is larger than that of the adjusting rod 41.

In this embodiment, the adjusting rod 41 comprises a tapered rod 411 passing through the first passage 13, and the diameter of the first passage 13 is larger than the maximum diameter of the tapered rod 411.

In this embodiment, one end of the tapered rod 411 is connected to the column 42, the other end of the tapered rod 411 extends into the first cavity, and the diameter of the end of the tapered rod 411 connected to the column 42 is larger than the diameter of the other end of the tapered rod 411.

In this embodiment, the second chamber 12 is provided with a second channel 121 for the sliding of the cylinder 42.

In this embodiment, the adjustable fuel ratio venturi of the present invention further comprises a motor 5 connected to the column 42.

In this embodiment, the motor shaft 51 of the motor 5 is connected to the cylinder 42 through a connecting structure.

In this embodiment, the connecting structure includes a first connecting bar 6 fixedly disposed on the motor shaft 51, a second connecting bar 7 rotatably disposed on the first connecting bar 6, and a third connecting bar 8 rotatably disposed on the second connecting bar 7, and the third connecting bar 8 is rotatably connected to the column 42. The first connecting bar 6 may be provided with a mounting groove matched with the motor shaft 51, and thus the first connecting bar 6 is fixedly installed on the motor shaft 51 by installing the motor shaft 51 into the mounting groove. The first connecting strip 6 and the second connecting strip 7, and the second connecting strip 7 and the third connecting strip 8 can be rotatably connected through a rotating bearing; a pull ring may be fixed to the end of the cylinder 42 and rotatably connected to the third connecting strip 8 by a rotary bearing, so that the cylinder 42 is rotatably connected to the third connecting strip.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Simple substitutions without changing the inventive content of the present invention are considered to be the same. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Adjustable combustion ratio venturi, its characterized in that: comprises a mixing pipeline (1), a gas channel (2) and an air channel (3) which are respectively communicated with the mixing pipeline (1), and an adjustable discharge rod (4) arranged on the mixing pipeline (1); the relative position of the adjustable discharge rod (4) and the mixing pipeline (1) is adjusted, so that the air-fuel ratio in the mixing pipeline (1) is adjusted.

2. The adjustable fuel ratio venturi of claim 1, wherein: mixing tube (1) includes first cavity (11), second cavity (12) with first cavity (11) intercommunication, is equipped with first passageway (13) between first cavity (11) and second cavity (12), and adjustable displacement stick (4) pass first passageway (13) and establish on the casing of second cavity (12), first cavity (11) and gas channel (2) intercommunication, second cavity (12) and air passageway (3) intercommunication.

3. The adjustable fuel ratio venturi of claim 2, wherein: the adjustable discharge rod (4) comprises a cylinder (42) which is slidably arranged on the shell of the second chamber (12) and an adjusting rod (41) which is connected with the cylinder (42) into a whole, the adjusting rod (41) penetrates through the first channel (13), and the diameter of the first channel (13) is larger than that of the adjusting rod (41).

4. The adjustable fuel ratio venturi according to claim 2 or 3, wherein: the adjusting rod (41) comprises a conical rod (411) passing through the first channel (13), the diameter of the first channel (13) being greater than the maximum diameter of the conical rod (411).

5. The adjustable fuel ratio venturi of claim 4, wherein: one end of the conical rod (411) is connected with the cylinder (42), the other end of the conical rod (411) extends into the first cavity, and the diameter of the end, connected with the cylinder (42), of the conical rod (411) is larger than that of the other end of the conical rod (411).

6. The adjustable fuel ratio venturi according to claim 3 or 5, wherein: the second chamber (12) housing is provided with a second channel (121) for the sliding of the cylinder (42).

7. The adjustable fuel ratio venturi of claim 6, wherein: also comprises a motor (5) connected with the cylinder (42).

8. The adjustable fuel ratio venturi of claim 7, wherein: the motor shaft (51) of the motor (5) is connected with the column body (42) through a connecting structure.

9. The adjustable fuel ratio venturi of claim 8, wherein: the connecting structure comprises a first connecting strip (6) fixedly arranged on the motor shaft (51), a second connecting strip (7) rotatably arranged on the first connecting strip (6), and a third connecting strip (8) rotatably arranged on the second connecting strip (7), wherein the third connecting strip (8) is rotatably connected with the cylinder (42).