CN112128758A

CN112128758A - Venturi tube, premixing device and gas equipment

Info

Publication number: CN112128758A
Application number: CN201910556587.7A
Authority: CN
Inventors: 陆祖安; 梁国荣; 刘胜; 马继卿; 刘继锋
Original assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-12-25

Abstract

The invention discloses a venturi tube, a premixing device and gas equipment, wherein the venturi tube comprises: a body defining a gas flow passage having an air inlet and a gas burner, air and gas being mixed within the gas flow passage; the flow limiting plate is arranged in the gas flow channel and defines an air port communicated with the air inlet; and the ball valve is slidably arranged on the inner wall surface of the gas flow passage and used for adjusting the flow area of the air port. According to the venturi device provided by the embodiment of the invention, the flow limiting plate with the air port is arranged in the gas flow channel, and the opening degree of the air port is controlled by the ball valve, so that a better air-fuel ratio is obtained, the air-fuel ratio adjusting range is wide, the universality is strong, and the venturi device can be suitable for the requirements of different load machine types.

Description

Venturi tube, premixing device and gas equipment

Technical Field

The invention relates to the technical field of water heaters, in particular to a venturi tube, a premixing device and gas equipment.

Background

The premixing device in the related art can not effectively adjust the mixing amount of gas and air, has small combustion adjustment ratio, and can not meet gas equipment with different load requirements.

Disclosure of Invention

The present invention aims to solve at least one of the above technical problems to a certain extent.

Therefore, the invention provides the venturi tube which is good in air-fuel ratio and strong in universality.

The invention also provides a premixing device with the venturi tube, and the premixing device is good in air-fuel ratio and strong in universality.

The invention also provides gas equipment with the premixing device, and the gas equipment is high in combustion efficiency.

A venturi in accordance with an embodiment of the first aspect of the present invention comprises: a body defining a gas flow passage having an air inlet and a gas inlet, air and gas being mixed within the gas flow passage; the flow limiting plate is arranged in the gas flow channel and defines an air port communicated with the air inlet; and the ball valve is slidably arranged on the inner wall surface of the gas flow passage and used for adjusting the flow area of the air port.

According to the venturi tube provided by the embodiment of the invention, the flow limiting plate with the air port is arranged in the gas flow channel, and the opening degree of the air port is controlled by the ball valve, so that a better air-fuel ratio is obtained, the air-fuel ratio adjusting range is wide, the universality is strong, and the venturi tube can meet the requirements of different load machine types.

According to some embodiments of the invention, the air ports comprise at least one normally closed air port and at least one normally open air port, and the ball valve is used for adjusting the opening size of the normally closed air port.

In an optional embodiment, a slide way for the ball valve to slide is arranged on the inner wall of the gas flow passage, the sliding stroke of the ball valve is positively correlated with the wind pressure of the air inlet, and the ball valve seals the normally closed air port at a low point.

In a further optional embodiment, the slide is an arc-shaped slide extending along the circumferential direction of the inner wall of the airflow channel, and two ends of the arc-shaped slide are respectively provided with a first limiting rib and a second limiting rib.

In an optional example, the slideway is a semi-arc slideway, and one half of the semi-arc slideway is a lowest point.

The premixing device according to the second aspect of the present invention comprises the venturi tube and the gas nozzle of the above embodiments, and the gas nozzle comprises a normally open gas nozzle corresponding to the normally open port, and a normally closed gas nozzle corresponding to the normally closed port.

In an optional embodiment, the normally closed air opening and the normally closed gas nozzle have positive correlation in opening degree.

In a further optional embodiment, the ball valve synchronously adjusts the opening sizes of the normally closed air opening and the normally closed gas nozzle.

In an alternative example, the air inlet is located at one axial end of the body, and the gas nozzle is formed on an inner wall of the gas flow passage and located downstream of the restrictor plate.

According to some embodiments of the invention, the venturi device comprises a throat section, a constant cross-section throat section and a flare section connected in series, the gas nozzle and the ball valve being located in the throat section.

In an optional embodiment, the opening of the normally closed tuyere is smaller than the opening of the normally open tuyere.

The gas equipment according to the third aspect of the invention comprises the premixing device of the above embodiment, and the air-fuel ratio adjusting range of the premixing device according to the embodiment of the invention is wide, so that the gas equipment can be suitable for gas equipment with different load requirements, and therefore, the air-fuel ratio of the gas equipment according to the embodiment of the invention is good.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of an angle configuration of a premixing device in accordance with some embodiments of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a schematic view of another angle of a premixing device in accordance with some embodiments of the present invention;

FIG. 5 is a cross-sectional view taken along line C-C of FIG. 4;

FIG. 6 is a perspective view of a premixing device in accordance with some embodiments of the present invention;

FIG. 7 is a schematic view of another angle of a premixing device in accordance with some embodiments of the present invention.

Reference numerals:

a premixing device 1000;

a venturi tube 100;

a body 10; an air inlet 11; a gas nozzle 12; a normally closed gas nozzle 121; a normally open gas nozzle 122; a gas flow channel 13; a slideway 14; a flared section 15; a throat section 16; a throat section 17;

a restrictor plate 20; a tuyere 21; a normally closed tuyere 211; a normally open tuyere 212;

a ball valve 30;

a first limit rib 41; a second limiting rib 42;

a housing 200;

a gas channel 60.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 1-3, a premixing device 1000 according to an embodiment of the present invention is described, where the premixing device 1000 may premix gases of different media, so as to obtain a uniformly mixed gas mixture, for example, when gas enters a combustion chamber of a gas appliance for combustion, gas and air may enter the premixing device 1000 in advance for premixing, and gas (air-fuel gas for short) after mixing air and gas enters the combustion chamber for sufficiently and effectively combusting. The gas-fired device herein includes, but is not limited to, a forced draft gas-fired device and a forced drum gas-fired device.

In addition, as shown in fig. 1 to 7, the premixing device 1000 further includes a housing 50, the venturi tube 100 is embedded in the housing 50, a gas passage 60 is formed by an outer wall surface of the venturi tube 100 and the housing 50, and the gas passage 60 is communicated with the gas nozzle 12.

It will be appreciated that the combustion efficiency and air/fuel ratio of the gas-fired appliance are of critical importance and therefore the present invention is focused on designing a novel venturi tube 100 that effectively regulates the amount of gas and air that participate in the mixing process.

Referring to fig. 1-7, the venturi 100 includes: a body 10, a restrictor plate 20, and a ball valve 30. The body 10 defines a gas flow passage 13 having an air inlet 11 and a gas inlet, the air and gas being mixed in the gas flow passage 13.

A restrictor plate 20 is disposed within the gas flow channel 13 and defines a tuyere 21 communicating with the air inlet 11. The ball valve 30 is slidably provided on an inner wall surface of the gas flow path 13 to adjust a flow area of the tuyere 21. In the case that the intake air amount of the air inlet 11 is fixed, the amount of air involved in mixing can be adjusted by adjusting the opening size of the tuyere 21 through the ball valve 30. The more the area of the tuyere 21 is shielded by the ball valve 30, the smaller the opening degree of the tuyere 21 is, and at this time, the larger the amount of air participating in mixing is; the smaller the area of the tuyere 21 shielded by the ball valve 30 is, the larger the opening degree of the tuyere 21 is, and at this time, the larger the amount of air involved in mixing.

That is, the amount of air entering the venturi tube 100 and participating in mixing is adjustable, and of course, in order to obtain a better air-fuel ratio, the amount of intake air of the gas participating in mixing is also adjustable, for example, a gas valve may be provided on a connecting pipe between a municipal gas pipeline and a gas device, and the intake pressure and the amount of intake air of the gas may be adjusted by the gas valve.

It should be noted that, herein, the air inlet 11 of the venturi tube 100 is connected to the air outlet of the fan, and the air inlet pressure of the venturi tube 100 is the same as the air outlet pressure of the fan. In other words, the amount of air involved in mixing is adjusted depending on the output wind pressure of the fan, so that the sliding stroke of the ball valve 30 can be correlated with the relevant parameters of the fan, and the mixing amount of gas and air can be more accurately controlled, thereby obtaining a better air-fuel ratio.

In addition, the mixing amount of the gas and the air can be controlled in various ways, for example, two valves can be arranged on the body 10 to control the opening degrees of the gas inlet and the tuyere 21 respectively, and for example, only one valve is arranged on the body 10 to synchronously control the opening degrees of the gas inlet and the tuyere 21.

Therefore, according to the venturi tube 100 of the embodiment of the present invention, the flow restriction plate 20 having the tuyere 21 is disposed in the gas flow passage 13, and the opening of the tuyere 21 is controlled by the ball valve 30, so that a better air-fuel ratio is obtained, the air-fuel ratio adjusting range is wide, the universality is strong, and the venturi tube can meet the requirements of different load models.

In some embodiments of the present invention, as shown in fig. 1 and 4, the tuyere 21 includes at least one normally closed tuyere 211 and at least one normally open tuyere 212, and the ball valve 30 is used for adjusting the opening of the normally closed tuyere 211. That is, the restrictor plate 20 may define one or more normally closed ports 211 and one or more normally open ports 212. Under any working condition, the normally open air port 212 is communicated with the air inlet 11, so that the minimum air inflow of the Venturi tube 100 is ensured, the opening degree of the normally closed air port 211 is adjusted through the ball valve 30 according to the load requirement, and thus, under different load requirements, enough air and gas inflow is ensured, and a better air-fuel ratio is obtained.

In an alternative embodiment, as shown in fig. 2 and 3, fig. 4 and fig. 5, the inner wall of the gas channel 13 is provided with a slide way 14 for sliding the ball valve 30, the ball valve 30 closes the normally closed air port 211 at a low point, and the sliding stroke of the ball valve 30 is positively correlated with the wind pressure of the air inlet 11. That is to say, the ball valve 30 is located at the low position and completely coincides with the normally closed air opening 211, at this time, the ball valve 30 is closely attached to the normally closed air opening 211, the normally closed air opening 211 does not blow out air, and under the condition that the air pressure is large enough, the ball valve 30 can slide from the low point to the high point, so as to gradually open the normally closed air opening 211. When the wind pressure is reduced, the ball valve 30 returns to the lowest position of the slideway 14 under the action of the gravity of the ball valve. Therefore, the sliding path of the ball valve 30 from the low point to the high point can be controlled through the wind pressure, and the ball valve 30 is reset from the high point to the low point by means of the gravity of the ball valve, so that the ball valve 30 is guaranteed to effectively adjust the air inflow participating in mixing.

In an alternative embodiment, the slide way 14 is an arc-shaped slide way 14 extending along the circumferential direction of the inner wall of the airflow channel, and a first limiting rib 41 and a second limiting rib 42 are respectively disposed at two ends of the arc-shaped slide way 14. Namely, the sliding track of the ball valve 30 is limited by the first limiting rib 41 and the second limiting rib 42, so that the influence of the ball valve 30 on the air output of the normally open air port 212 is avoided, and the air input of the air participating in mixing is better adjusted.

Further optionally, the slideway 14 is a semi-circular slideway 14, one half of the semi-circular slideway 14 being the lowest point. That is to say, the stroke that the ball valve 30 can slide according to the clockwise is equal with the stroke that can slide according to the anticlockwise, like this, can make the ball valve 30 adapt to the wind pressure of different wind directions, improves the reliability and the sensitivity of ball valve 30.

The premixing device 1000 according to the embodiment of the present invention includes the venturi tube 100 and the gas nozzle 12 of the above-described embodiment, and the gas nozzle 12 includes a normally open gas nozzle 122 corresponding to the normally open port 212, and a normally closed gas nozzle 121 corresponding to the normally closed port 211. That is, the gas nozzles 12 are also classified into two types, one type being normally open and the other type being normally closed (i.e., selectively open), wherein the normally closed gas nozzle 121 and the normally closed air port 211 are opened or closed in synchronization, so that the supply amount of the gas amount and the air amount can be increased or decreased in synchronization, ensuring that the venturi device 100 obtains a preferable air-fuel ratio.

Wherein, the opening of the normally closed air port 211 and the normally closed gas nozzle 121 are positively correlated. I.e., the intake amounts of air and gas are positively correlated, so that a better air-fuel ratio can be obtained.

According to the premixing device 1000 of the embodiment of the invention, the ball valve 30 is used for adjusting the opening degree of the gas nozzle 12 and the tuyere 21, so that the amount of air and the amount of gas which are mixed are effectively adjusted, and a better air-fuel ratio is obtained.

In the preferred embodiment, the ball valve 30 synchronously adjusts and adjusts the opening of the normally closed air port 211 and the normally closed gas nozzle 121. That is, when the ball valve 30 is located at the low point, a part of the spherical surface of the ball valve 30 is closely attached to the normally closed air inlet 211, and another part of the spherical surface of the ball valve 30 is closely attached to the normally closed gas inlet. The ball valve 30 can simultaneously open or close the normally closed air port 211 and the normally closed gas nozzle 121, thereby simultaneously increasing or decreasing the air and gas intake amounts.

In one embodiment, the air inlet 11 is located at one axial end of the venturi 10, and the gas burner 12 is formed on the inner wall of the gas flow passage 13 and located downstream of the restrictor plate 20. That is, the air in the gas flow passage 13 flows in the axial direction thereof, and the gas is injected into the gas flow passage 13 from the circumferential direction to be mixed with the air, thereby achieving premixing downstream of the gas flow passage 13.

In other embodiments of the invention, the venturi 100 comprises a throat section 15, a throat section 16 of constant cross-section and a flared section 17 connected in series, the gas burner 12 and the ball valve 30 being located in the throat section 16. In research and experiments, the inventor finds that in the process of moving the airflow from the necking section 15 to the throat section 16, the wind speed is suddenly increased, negative pressure is obviously formed, and how to suck the fuel gas and the air into the throat section 16 is realized to fully mix the fuel gas and the air.

The gas appliance according to the embodiment of the present invention includes the premixing device 1000 according to the above-mentioned embodiment, and since the air-fuel ratio adjusting range of the premixing device 1000 according to the embodiment of the present invention is wide, the gas appliance can be applied to gas appliances with different load requirements, and therefore, the air-fuel ratio of the gas appliance according to the embodiment of the present invention is good.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims

1. A venturi, comprising:

a body defining a gas flow passage having an air inlet and a gas inlet, air and gas being mixed within the gas flow passage;

the flow limiting plate is arranged in the gas flow channel and defines an air port communicated with the air inlet;

and the ball valve is slidably arranged on the inner wall surface of the gas flow passage and used for adjusting the flow area of the air port.

2. The venturi tube of claim 1, wherein the tuyere comprises at least one normally closed tuyere and at least one normally open tuyere, and the ball valve is used for adjusting the opening size of the normally closed tuyere.

3. The venturi tube of claim 2, wherein the inner wall of the gas flow channel is provided with a slide way for the ball valve to slide, the sliding stroke of the ball valve is positively correlated with the wind pressure of the air inlet, and the ball valve closes the normally closed air port at a low point.

4. The venturi tube of claim 3, wherein the slide is an arc-shaped slide extending along a circumferential direction of the inner wall of the airflow channel, and a first limiting rib and a second limiting rib are respectively disposed at two ends of the arc-shaped slide.

5. The venturi of claim 4, wherein the slide is a semi-circular slide, one-half of the semi-circular slide being the lowest point.

6. A premixing device comprising a venturi tube according to any of claims 1-5, further comprising a gas nozzle comprising a normally open gas nozzle corresponding to the normally open port, and a normally closed gas nozzle corresponding to the normally closed port.

7. The premixing device of claim 6 wherein the normally closed ports and the normally closed gas nozzles have a positive correlation in opening size.

8. The premixing device of claim 6 wherein the ball valve synchronously adjusts the opening of the normally closed tuyere and the normally closed gas burner.

9. The premixing device of claim 8 wherein the air inlet is located at an axial end of the body and the gas burner is formed in an inner wall of the gas flow passage downstream of the flow restriction plate.

10. The premixing device of any of claims 1-5 or 7-9 wherein the venturi comprises a throat section, a constant cross-section throat section and a flare section connected in series, the gas inlet and the ball valve being located in the throat section.

11. The premixing device of any of claims 1-5 or 7-9 wherein the opening of the normally closed ports is smaller than the opening of the normally open ports.

12. A gas-fired apparatus, characterized in that it comprises a premixing device according to any of claims 6-11.