Venturi tube, premixing device and gas equipment

Abstract

The present invention discloses a Venturi tube, a premixing device and a gas equipment. The Venturi tube includes: a body which defines a gas flow passage having an air inlet and a gas nozzle, and air and gas are mixed in the gas flow passage; a flow limiting plate which is arranged in the gas flow passage and defines an air port communicated with the air inlet; and a ball valve which is slidably arranged on the inner wall surface of the gas flow passage and is used for adjusting the flow area of the air port. According to the Venturi device of the embodiment of the present invention, by arranging a flow limiting plate with an air port in the gas flow passage and controlling the opening degree of the air port by the ball valve, a better air-fuel ratio can be obtained, the adjustment range of the air-fuel ratio is large, and the universality is strong, so that the requirements of different load models can be adapted to.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and more particularly, to a Venturi tube, a premixing device, and a gas device. Background Art

[0002] The premixing device in the related art cannot effectively adjust the mixing amount of gas and air, has a small combustion adjustment ratio, and cannot meet the gas devices with different load requirements. Summary of the Invention

[0003] The present invention aims to solve at least one of the above technical problems to some extent.

[0004] To this end, the present invention provides a Venturi tube, which has a good air-fuel ratio and strong versatility.

[0005] The present invention also provides a premixing device having the above Venturi tube, which has a good air-fuel ratio and strong versatility.

[0006] The present invention also provides a gas device having the above premixing device, which has a high combustion efficiency.

[0007] The Venturi tube according to the first aspect embodiment of the present invention includes: a body, the body defining a gas flow channel having an air inlet and a gas inlet, air and gas being mixed in the gas flow channel; a flow limiting plate, the flow limiting plate being disposed in the gas flow channel and defining an air outlet communicating with the air inlet; a ball valve, the ball valve being slidably disposed on the inner wall surface of the gas flow channel for adjusting the flow area of the air outlet.

[0008] The Venturi tube according to the embodiment of the present invention obtains a better air-fuel ratio by providing a flow limiting plate with an air outlet in the gas flow channel and controlling the opening degree of the air outlet by the ball valve. The air-fuel ratio adjustment range is large, and the versatility is strong, which can meet the requirements of different load models.

[0009] According to some embodiments of the present invention, the air outlet includes at least one normally closed air outlet and at least one normally open air outlet, and the ball valve is used to adjust the opening degree of the normally closed air outlet.

[0010] In an alternative embodiment, a slideway for the ball valve to slide is provided on the inner wall of the gas flow channel. The sliding stroke of the ball valve is positively correlated with the wind pressure of the air inlet, and the normally closed air outlet is closed at the low point of the ball valve.

[0011] In a further alternative embodiment, the slideway is an arc-shaped slideway extending along the circumferential direction of the inner wall of the gas flow channel, and a first limiting rib and a second limiting rib are respectively provided at both ends of the arc-shaped slideway.

[0012] In an alternative example, the slideway is a semi-circular arc slideway, and half of the semi-circular arc slideway is the lowest point.

[0013] The premixing device according to the second aspect of the present invention includes the Venturi tube and the gas nozzle of the above embodiment. The gas nozzle includes a normally open gas nozzle corresponding to the normally open air vent and a normally closed gas nozzle corresponding to the normally closed air vent.

[0014] In an alternative embodiment, the opening degree of the normally closed air vent and the normally closed gas nozzle are positively correlated.

[0015] In a further alternative embodiment, the ball valve synchronously adjusts the opening degrees of the normally closed air vent and the normally closed gas nozzle.

[0016] In an alternative example, the air inlet is located at one axial end of the body, and the gas nozzle is formed on the inner wall of the gas flow channel and is located downstream of the flow limiting plate.

[0017] According to some embodiments of the present invention, the Venturi device includes a reduced diameter section, a throat section with a constant cross-section, and a flared section that are connected in sequence. The gas nozzle and the ball valve are both provided in the throat section.

[0018] In an alternative embodiment, the opening of the normally closed air vent is smaller than the opening of the normally open air vent.

[0019] The gas equipment according to the embodiment of the third aspect of the present invention includes the premixing device of the above embodiment. Since the air-fuel ratio adjustment range of the premixing device according to the embodiment of the present invention is large and it can be applied to gas equipment with different load requirements, therefore, the air-fuel ratio of the gas equipment according to the embodiment of the present invention is good.

[0020] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0021] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0022] Figure 1 is a schematic structural diagram of a premixing device from one angle according to some embodiments of the present invention;

[0023] Figure 2 is Figure 1 a cross-sectional view along line A-A;

[0024] Figure 3 is Figure 1 a cross-sectional view along line B-B;

[0025] Figure 4It is a schematic structural diagram of the premixing device from another angle according to some embodiments of the present invention;

[0026] Figure 5 is Figure 4 a cross-sectional view along line C-C;

[0027] Figure 6 It is a perspective view of the premixing device according to some embodiments of the present invention;

[0028] Figure 7 It is a schematic structural diagram of the premixing device from another angle according to some embodiments of the present invention.

[0029] Reference numerals:

[0030] Premixing device 1000;

[0031] Venturi tube 100;

[0032] Body 10; air inlet 11; gas nozzle 12; normally closed gas nozzle 121; normally open gas nozzle 122; gas flow channel 13; slideway 14; reduced diameter section 15; throat section 16; flared section 17;

[0033] Flow limiting plate 20; air outlet 21; normally closed air outlet 212; normally open air outlet 211;

[0034] Ball valve 30;

[0035] First limiting rib 41; second limiting rib 42;

[0036] Outer shell 200;

[0037] Gas channel 60. Detailed implementation manners

[0038] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] Referring to Figures 1-3 The premixing device 1000 according to the embodiments of the present invention will be described. The premixing device 1000 can premix gases of different media to obtain a uniformly mixed gas mixture. For example, when gas enters the combustion chamber of a gas device for combustion, the gas and air can enter the premixing device 1000 in advance for premixing, and the gas after mixing of air and gas (referred to as air-fuel gas) enters the combustion chamber for full and effective combustion. Among them, the gas devices herein include but are not limited to forced extraction type gas devices and forced blowing type gas devices.

[0040] In addition, asFigures 1-7 As shown, the premixing device 1000 further includes a housing 200. The Venturi tube 100 is embedded in the housing 200. A gas passage 60 is defined between the outer wall surface of the Venturi tube 100 and the housing 200, and the gas passage 60 communicates with the gas nozzle 12.

[0041] It can be understood that the combustion efficiency of gas equipment is crucial to the air-fuel ratio. Therefore, the present invention focuses on designing a new type of Venturi tube 100, which can effectively adjust the gas volumes of the gas and air participating in the mixing.

[0042] Refer to Figures 1-7 , the Venturi tube 100 includes: a main body 10, a current-limiting plate 20, and a ball valve 30. The main body 10 defines a gas flow passage 13 having an air inlet 11 and a gas inlet, and air and gas are mixed in the gas flow passage 13.

[0043] The current-limiting plate 20 is disposed in the gas flow passage 13 and defines an air outlet 21 communicating with the air inlet 11. The ball valve 30 is slidably disposed on the inner wall surface of the gas flow passage 13 for adjusting the flow area of the air outlet 21. When the air intake volume at the air inlet 11 is fixed, the opening degree of the air outlet 21 can be adjusted by the ball valve 30 to adjust the air volume participating in the mixing. The more the ball valve 30 blocks the air outlet 21, the smaller the opening degree of the air outlet 21. At this time, the air volume participating in the mixing is smaller; the less the ball valve 30 blocks the air outlet 21, the larger the opening degree of the air outlet 21. At this time, the air volume participating in the mixing is larger.

[0044] That is to say, the air volume entering the Venturi tube 100 and participating in the mixing is adjustable. Of course, in order to obtain a better air-fuel ratio, the gas intake volume participating in the mixing is also adjustable. For example, a gas valve can be provided on the connecting pipe between the municipal gas pipeline and the gas equipment to adjust the inlet gas pressure and intake volume of the gas.

[0045] It should be noted that the air inlet 11 of the Venturi tube 100 in this article is connected to the air outlet of the fan, and the inlet air pressure of the Venturi tube 100 is the same as the outlet air pressure of the fan. In other words, the adjustment of the air volume participating in the mixing depends on the output air pressure of the fan, so that the sliding stroke of the ball valve 30 can be associated with the relevant parameters of the fan to more accurately control the mixing amount of gas and air, thereby obtaining a better air-fuel ratio.

[0046] In addition, there are various ways to control the mixing amount of gas and air. For example, two valves can be provided on the main body 10 to respectively control the opening degrees of the gas inlet and the air outlet 21. Another example is that only one valve is provided on the main body 10 to synchronously control the opening degrees of the gas inlet and the air outlet 21 through this valve.

[0047] Thus, for the Venturi tube 100 according to the embodiments of the present invention, by providing a flow limiting plate 20 with air outlets 21 in the gas flow path 13 and controlling the opening degree of the air outlets 21 through the ball valve 30, a better air-fuel ratio can be obtained. The air-fuel ratio adjustment range is large and the versatility is strong, which can meet the requirements of different load models.

[0048] In some embodiments of the present invention, as Figure 1 , Figure 4 shown, the air outlet 21 includes at least one normally closed air outlet 212 and at least one normally open air outlet 211, and the ball valve 30 is used to adjust the opening degree of the normally closed air outlet 212. That is, the flow limiting plate 20 can form one or more normally closed air outlets 212 and one or more normally open air outlets 211. Under any working conditions, the normally open air outlet 211 is always communicated with the air inlet 11, so as to ensure the minimum air intake of the Venturi tube 100. The opening degree of the normally closed air outlet 212 is adjusted through the ball valve 30 according to the load demand. In this way, sufficient air and gas intakes can be obtained under different load demands, and a better air-fuel ratio can be obtained.

[0049] In an alternative embodiment, as Figure 2 and Figure 3 , Figure 4 and Figure 5 shown, the inner wall of the gas flow path 13 is provided with a slideway 14 for the ball valve 30 to slide. The ball valve 30 closes the normally closed air outlet 212 at the 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, when the ball valve 30 is located at the low point, it completely coincides with the normally closed air outlet 212. At this time, the ball valve 30 is closely attached to the normally closed air outlet 212, and the normally closed air outlet 212 does not blow air. When the wind pressure is large enough, the ball valve 30 can slide from the low point to the high point, thereby gradually opening the normally closed air outlet 212. When the wind pressure decreases, the ball valve 30 returns to the lowest point of the slideway 14 under its own gravity. In this way, the sliding path of the ball valve 30 from the low point to the high point can be controlled by the wind pressure, and it can be reset from the high point to the low point by its own gravity, so as to ensure that the ball valve 30 effectively adjusts the air intake participating in the mixture.

[0050] In an alternative embodiment, the slideway 14 is an arc-shaped slideway 14 extending along the circumferential direction of the inner wall of the gas flow path. The two ends of the arc-shaped slideway 14 are respectively provided with a first limiting rib 41 and a second limiting rib 42. That is, the sliding trajectory of the ball valve 30 is limited by the first limiting rib 41 and the second limiting rib 42, so as to avoid the ball valve 30 affecting the air output of the normally open air outlet 211, thereby better adjusting the air intake participating in the mixture.

[0051] Further optionally, the slideway 14 is a semi-circular arc slideway 14, and half of the semi-circular arc slideway 14 is the lowest point. That is to say, the sliding stroke of the ball valve 30 in the clockwise direction is equal to the sliding stroke in the counterclockwise direction. In this way, the ball valve 30 can adapt to the wind pressure in different wind directions, improving the reliability and sensitivity of the ball valve 30.

[0052] The premixing device 1000 according to an embodiment of the present invention includes the venturi tube 100 and the gas nozzle 12 of the above embodiment. The gas nozzle 12 includes a normally open gas nozzle 122 corresponding to the normally open air vent 211 and a normally closed gas nozzle 121 corresponding to the normally closed air vent 212. That is to say, the gas nozzle 12 is also divided into two types, one is normally open and the other is normally closed (i.e., selectively open). Among them, the normally closed gas nozzle 121 is opened or closed synchronously with the normally closed air vent 212, so that the supply amounts of the gas and the air can be increased or decreased synchronously, ensuring that the venturi device obtains a better air-fuel ratio.

[0053] Among them, the opening degrees of the normally closed air vent 212 and the normally closed gas nozzle 121 are positively correlated. That is, the intake amounts of the air and the gas are positively correlated. In this way, a better air-fuel ratio can be obtained.

[0054] For the premixing device 1000 according to an embodiment of the present invention, the opening degrees of the gas nozzle 12 and the air vent 21 are adjusted by the ball valve 30, and then the amounts of the air and the gas participating in the mixing are effectively adjusted, so as to obtain a better air-fuel ratio.

[0055] In a preferred embodiment, the ball valve 30 synchronously adjusts the opening degrees of the normally closed air vent 212 and the normally closed gas nozzle 121. That is, when the ball valve 30 is at the lowest point, a part of the spherical surface of the ball valve 30 is in close contact with the normally closed air vent 212, and the other part of the spherical surface of the ball valve 30 is in close contact with the normally closed gas vent. The ball valve 30 can open or close the normally closed air vent 212 and the normally closed gas nozzle 121 synchronously, so as to increase or decrease the intake amounts of the air and the gas simultaneously.

[0056] In a specific embodiment, the air inlet 11 is located at one axial end of the venturi tube 100, and the gas nozzle 12 is formed on the inner wall of the gas flow channel 13 and is located downstream of the throttle plate 20. That is, the air in the gas flow channel 13 flows along its axial direction, and the gas is injected into the gas flow channel 13 from the circumferential direction to be mixed with the air, so as to achieve premixing downstream of the gas flow channel 13.

[0057] In some other embodiments of the present invention, the venturi tube 100 includes a reduced diameter section 15, a throat section 16 with a constant cross-section, and a flared section 17 that are connected in sequence. The gas nozzle 12 and the ball valve 30 are both arranged in the throat section 16. The inventors found in the research experiment that during the process of the air flow moving from the reduced diameter section 15 to the throat section 16, the wind speed will suddenly increase, resulting in an obvious negative pressure. How to suck the gas and the air into the throat section 16 to make them fully mixed.

[0058] The gas equipment according to an embodiment of the present invention includes the premixing device 1000 of the above embodiment. Since the air-fuel ratio adjustment range of the premixing device 1000 according to an embodiment of the present invention is large and it can be applied to gas equipment with different load requirements, therefore, the air-fuel ratio of the gas equipment according to an embodiment of the present invention is good.

[0059] In the present invention, unless otherwise clearly defined and limited, the first feature being “on” or “under” the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being “above”, “over” and “on top of” the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being “under”, “below” and “beneath” the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0060] In the description of this specification, the description with reference to terms such as “an embodiment”, “some embodiments”, “example”, “specific example”, or “some examples” etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A Venturi tube, characterized in that, Comprising: A body that defines a gas flow path having an air inlet and a gas inlet, where air and gas are mixed within the gas flow path; A flow limiting plate disposed within the gas flow path and defining an air outlet communicating with the air inlet; A ball valve slidably disposed on the inner wall surface of the gas flow path for adjusting the flow area of the air outlet; The air outlet includes at least one normally closed air outlet and at least one normally open air outlet, and the ball valve is used for adjusting the opening degree of the normally closed air outlet; A slideway for the ball valve to slide is provided on the inner wall of the gas flow path, and the sliding stroke of the ball valve is positively correlated with the wind pressure magnitude at the air inlet. The normally closed air outlet is closed by the ball valve at the low point; It further includes a gas nozzle, and the gas nozzle includes a normally open gas nozzle corresponding to the normally open air outlet and a normally closed gas nozzle corresponding to the normally closed air outlet; The ball valve synchronously adjusts the opening degrees of the normally closed air outlet and the normally closed gas nozzle.

2. The Venturi tube according to claim 1, characterized in that, The slideway is an arc-shaped slideway extending along the circumferential direction of the inner wall of the gas flow path, and a first limiting rib and a second limiting rib are respectively provided at both ends of the arc-shaped slideway.

3. The Venturi tube according to claim 2, characterized in that, The slideway is a semi-circular arc slideway, and one-half of the semi-circular arc slideway is the lowest point.

4. A premixing device, comprising a Venturi tube according to any one of claims 1-3, characterized in that, The opening degrees of the normally closed air outlet and the normally closed gas nozzle are positively correlated.

5. The premixing device according to claim 4, wherein The air inlet is located at one axial end of the body, and the gas nozzle is formed on the inner wall of the gas flow path and is located downstream of the flow limiting plate.

6. The premixing device according to any one of claims 4, characterized in that, The venturi tube includes a reduced diameter section, a throat section with a constant cross-section, and an enlarged diameter section connected in sequence, and both the gas inlet and the ball valve are disposed in the throat section.

7. The premixing device according to any one of claims 4, characterized in that The opening of the normally closed air outlet is smaller than the opening of the normally open air outlet.

8. A gas device, characterized in that, Comprising the premixing device according to any one of claims 4-7.

Images