Premixing device and gas equipment

Abstract

The present invention discloses a premixing device and a gas equipment. The premixing device includes: a main body that defines a gas flow passage having an air inlet and a gas nozzle; a gas volume adjusting device disposed in the gas flow passage for adjusting the gas volume and air volume participating in the mixing, and the mixing amount of the gas and the air is positively correlated with the wind pressure magnitude at the air inlet. According to the premixing device of the embodiment of the present invention, by providing a gas volume adjusting device in the gas flow passage to adjust the gas volume and air volume participating in the mixing, and the mixing amount of the gas and the air is positively correlated with the wind pressure magnitude at the air inlet, a better air-fuel ratio can be obtained, and the air-fuel ratio adjustment range is large.

Description

Technical Field

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

[0002] The gas mixer 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 gas mixer, and the premixing device has a good air-fuel ratio and strong versatility.

[0005] The present invention also provides a gas device with the above premixing device, and the gas device has high combustion efficiency.

[0006] According to the premixing device of the present invention, it includes: a main body, the main body defining a gas flow channel having an air inlet and a gas nozzle; a gas volume adjusting device, the gas volume adjusting device being disposed in the gas flow channel for adjusting the gas volume and air volume participating in the mixing, and the mixing amount of gas and air being positively correlated with the wind pressure magnitude at the air inlet.

[0007] According to the premixing device of the embodiments of the present invention, by providing a gas volume adjusting device in the gas flow channel to adjust the gas volume and air volume participating in the mixing, and the mixing amount of gas and air being positively correlated with the wind pressure magnitude at the air inlet, a better air-fuel ratio can be obtained, and the air-fuel ratio adjustment range is large.

[0008] According to some embodiments of the present invention, the gas volume adjusting device includes: a wind volume adjusting plate, the wind volume adjusting plate being disposed in the gas flow channel and formed with a plurality of air outlets oppositely arranged with respect to the air inlet; an impeller assembly, the impeller assembly including a rotating shaft penetrating through the wind volume adjusting plate and a plurality of impellers disposed on the rotating shaft, the impellers at least partially overlapping with the wind volume adjusting plate in the projection in the direction perpendicular to the paper surface, and the impeller assembly being driven to rotate by the wind pressure, thereby changing the position of the impellers relative to the wind volume adjusting plate.

[0009] In an alternative embodiment, the wind volume adjusting plate includes at least one normally closed air outlet and at least one normally open air outlet, and the impellers control the opening degree of the normally closed air outlets.

[0010] In an alternative embodiment, the number of the normally closed air outlets is two, the wind volume adjusting plate is provided with two baffles, one of the baffles is located between the normally closed air outlet and the normally open air outlet, the other baffle is located between the two normally closed air outlets, and the two radial sides of the normally open air outlet are provided with limiting ribs.

[0011] In a further alternative embodiment, one of the baffles is provided with a ventilation opening.

[0012] In a further alternative embodiment, the projected areas of the two baffles and the two normally closed air vents in the direction perpendicular to the paper surface are the same.

[0013] In an alternative example, the sum of the flow areas of the two normally closed air vents is the same as the flow area of the normally open air vent.

[0014] In some embodiments of the present invention, 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.

[0015] In an alternative embodiment, the gas nozzle penetrates the inner peripheral wall of the body and communicates with the gas flow passage. The impeller assembly further includes a valve that rotates synchronously with the rotating shaft to control the opening degree of the normally closed gas nozzle.

[0016] In a further alternative embodiment, the impeller is provided at one end of the rotating shaft on the same side as the windward surface of the air volume adjusting plate, and the valve is provided at the other end of the rotating shaft on the same side as the leeward surface of the air volume adjusting plate.

[0017] In a further alternative embodiment, the impeller assembly further includes: a connecting arm, one end of the connecting arm is connected to the rotating shaft, and the other end of the connecting arm is connected to the valve.

[0018] In an alternative embodiment, the connecting arm is parallel to the center line of the impeller.

[0019] In a further alternative embodiment, the weight of at least one of the impellers is greater than the weight of the remaining impellers.

[0020] In an alternative example, the premixing 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 gas volume adjusting device are both provided in the throat section.

[0021] The gas equipment according to the embodiment of the present invention includes the gas mixer of the above embodiment. Since the air-fuel ratio adjustment range of the gas mixer 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.

[0022] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

[0024] Figure 1 is a schematic structural view of a gas mixer according to some embodiments of the present invention;

[0025] Figure 2 is a schematic structural view of the gas mixer from another angle according to some embodiments of the present invention;

[0026] Figure 3 is a schematic structural view of the gas mixer from another angle according to some embodiments of the present invention;

[0027] Figure 4 is a schematic structural view of the gas mixer from another angle according to some embodiments of the present invention;

[0028] Figure 5 is a schematic structural view of the gas mixer from another angle according to some embodiments of the present invention;

[0029] Figure 6 is a schematic structural view of the gas mixer from another angle according to some embodiments of the present invention;

[0030] Figure 7 is a schematic structural view of the gas mixer from another angle according to some embodiments of the present invention;

[0031] Figure 8 is a schematic structural view of the gas mixer from another angle according to some embodiments of the present invention;

[0032] Figure 9 is a schematic structural view of the gas mixer from another angle according to some embodiments of the present invention;

[0033] Figure 10 is a schematic structural view of an impeller assembly according to some embodiments of the present invention;

[0034] Figure 11 is a schematic structural view of the impeller assembly from another angle according to some embodiments of the present invention.

[0035] Reference numerals:

[0036] Premixing device 100;

[0037] Body 10; Gas flow channel 11; Air inlet 111; Gas nozzle 112; Normally closed air nozzle 1121; Normally open air nozzle 1122; Flared section 12; Throat section 13; Reduced diameter section 14;

[0038] Gas volume regulating device 20;

[0039] Air volume regulating plate 21; air outlet 211; normally closed air outlet 2111; normally open air outlet 2112; baffle 212; ventilation opening 2121; limiting rib 213;

[0040] Impeller assembly 22; rotating shaft 221; impeller 222; valve 223; connecting arm 224;

[0041] Outer shell 30. Specific embodiments

[0042] 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.

[0043] Refer to Figures 1 - 11 Describe the premixing device 100 of the embodiment of the present invention. The premixing device 100 can premix gases of different media to obtain a uniformly mixed gas mixture. For example, when the fuel gas enters the combustion chamber of the fuel gas device for combustion, the fuel gas and air can enter the premixing device 100 in advance for premixing, and the gas (referred to as the air-fuel gas) after mixing of the air and fuel gas enters the combustion chamber for full and effective combustion. Among them, the fuel gas devices herein include but are not limited to forced extraction type fuel gas devices and forced blowing type fuel gas devices.

[0044] In addition, the fuel gas mixer 100 further includes an outer shell 30. The premixing device 100 is embedded in the outer shell 30. The outer wall surface of the premixing device 100 and the outer shell 30 define a fuel gas channel, and the fuel gas channel communicates with the fuel gas nozzle 112.

[0045] It can be understood that the combustion efficiency of the fuel gas device is crucial to the air-fuel ratio. Therefore, the present invention focuses on designing a new type of premixing device, which can effectively adjust the gas volumes of the fuel gas and air participating in the mixing.

[0046] Refer to Figures 1 - 3 , the premixing device 100 includes: a main body 10 and a gas volume regulating device 20. The main body 10 defines a gas flow channel 11, and the gas volume regulating device 20 is arranged in the gas flow channel 11 for adjusting the gas volumes of the fuel gas and air participating in the mixing. Among them, the mixing amount of the fuel gas and air is positively correlated with the wind pressure magnitude of the air inlet 211.

[0047] That is to say, the gas volumes of the air and fuel gas entering the premixing device 100 to participate in the mixing are both adjustable, and the mixing amount of the fuel gas and air is related to the wind pressure magnitude. That is, the gas volume regulating device 20 controls the mixing amount of the fuel gas and air based on the wind pressure magnitude. When the wind pressure is large, the mixing amount of the fuel gas and air increases; when the wind pressure is small, the mixing amount of the fuel gas and air decreases.

[0048] It should be noted that the air inlet 211 of the premixing device 100 in this text is connected to the air outlet of the fan, and the inlet air pressure of the premixing device 100 is the same as the outlet air pressure of the fan. In other words, the adjustment of the mixing amount of gas and air by the gas amount adjustment device 20 depends on the output air pressure of the fan, so that the relevant parameters of the air flow adjustment device and the fan can be associated, and the mixing amount of gas and air can be controlled more precisely, thereby obtaining a better air-fuel ratio.

[0049] In addition, the gas amount adjustment device 20 can control the mixing amount of gas and air in various ways. For example, two valves can be provided on the main body 10 to control the opening degrees of the gas nozzle 112 and the air inlet 211 respectively. Another example is that only one valve for controlling the opening degree of the air inlet is provided on the main body, and the gas amount participating in the mixing can be controlled by a gas proportional valve.

[0050] Thus, for the premixing device 100 according to the embodiment of the present invention, by providing a gas amount adjustment device in the gas flow path 11 to adjust the gas amount and air amount participating in the mixing, and the mixing amount of gas and air is positively correlated with the air pressure at the air inlet 111, thereby obtaining a better air-fuel ratio and a large air-fuel ratio adjustment range.

[0051] In some embodiments of the present invention, the gas amount adjustment device 20 includes: an air volume adjustment plate 21 and an impeller assembly 22.

[0052] Specifically, the air volume adjustment plate 21 is arranged in the gas flow path 11 and is formed with a plurality of air inlets 211 arranged opposite to the air inlet 111. That is to say, the plurality of air inlets 211 of the air volume adjustment plate 21 divide the air flow entering the gas flow path 11, and then the air amount participating in the mixing is controlled by controlling the on-off of the plurality of air inlets 211. Among them, the shape of the air inlet 211 can be circular, square, fan-shaped or trapezoidal, etc.

[0053] As Figures 4 - 6 Combined Figure 10 and Figure 11 shown, the impeller assembly 22 includes a rotating shaft 221 passing through the air volume adjustment plate 21 and a plurality of impellers 222 arranged on the rotating shaft 221. The impellers 222 and the air volume adjustment plate 21 at least partially overlap in the direction perpendicular to the paper surface. The impeller assembly 22 is driven to rotate by the air pressure, so as to change the position of the impellers 222 relative to the air volume adjustment plate 21. In other words, under different air pressure conditions, the position of the impellers 222 relative to the air volume adjustment plate 21 is different. For example, in the case of relatively small air pressure, the impellers 222 are in the first position. As Figure 4 shown, the impellers 222 cut off two air inlets 211. At this time, only one air inlet 211 is open; in the case of relatively large air pressure, the impellers 222 are in the second position. As Figure 5As shown, all three air vents 211 on the air volume adjustment plate 21 are open. That is to say, with the change of the wind pressure, the impeller 222 can move between the first position and the second position, thereby changing the position of the impeller 222 relative to the air volume adjustment plate 21, realizing the adjustment of the opening degree of the air vent 211, and thus adjusting the size of the air vent 211 in real time according to the magnitude of the wind pressure, and finally realizing the adjustment of the air volume participating in the mixing.

[0054] It should be noted that the above is only an example to illustrate that the positional relationship between the impeller 222 and the air volume adjustment plate 21 will change with the change of the wind pressure, and it is not a limitation on the number of air vents 211 of the air volume adjustment plate 21 and the impeller 222. The number of air vents 211 and the impeller 222 of the air volume adjustment plate 21 can be modified in different ways according to the design requirements.

[0055] In some embodiments of the present invention, the air volume adjustment plate 21 includes at least one normally closed air vent 2111 and at least one normally open air vent 2112, and the impeller 222 controls the opening degree of the normally closed air vent 2111. That is to say, the opening degree of the normally open air vent 2112 on the air volume adjustment plate 21 is not affected by the magnitude of the wind pressure. The normally open air vent 2112 is always connected to the air inlet 111, and the minimum air supply is ensured through the normally open air vent 2112. With the change of the wind pressure, the change of the position of the impeller 222 relative to the air volume adjustment plate 21 will change the opening degree of the normally closed air vent 2111, so as to achieve the purpose of adjusting the air volume in real time. Combining Figure 4 and Figure 5 it can be known that the larger the overlapping area of the projections of the impeller 222 and the normally closed air vent 2111 in the direction perpendicular to the paper surface, the smaller the opening degree of the normally closed air vent 2111. In the case of complete overlap, the opening degree of the normally closed air vent 2111 is almost zero. In the case of complete non - overlap, the opening degree of the normally closed air vent 2111 is the largest, and at this time, the air volume that can participate in the mixing is the largest.

[0056] In a further optional embodiment, as Figure 4 and Figure 5 shown, the number of normally closed air vents 2111 is two. The air volume adjustment plate 21 is provided with two baffles 212. One baffle 212 is located between the normally closed air vent 2111 and the normally open air vent 2112, and the other baffle 212 is located between the two normally closed air vents 2111. The two radial edges of the normally open air vent 2112 are provided with limiting ribs 213.

[0057] That is to say, the rotation range of the impeller 222 is limited between the two limiting ribs 213, that is, the rotation range of the impeller 222 does not include the area where the normally open air vent 2112 is located, so as to avoid the interference of the impeller 222 on the opening degree of the normally open air vent 2112. When the impeller 222 partially overlaps or completely overlaps with the baffle 212, the normally closed air vent 2111 is in a partially open or fully open state.

[0058] In an alternative example, one of the baffles 212 is provided with a ventilation opening 2121, as Figure 4 shown. In this way, when the impeller 222 coincides with the baffle 212, part of the air can hit the impeller 222 through the ventilation opening 2121, promoting the rotation of the impeller 222 and preventing the impeller 222 from getting stuck.

[0059] Preferably, the projected areas of the two baffles 212 and the two normally closed air vents 2111 in the direction perpendicular to the paper surface are the same. In this way, the two normally closed air vents 2111 can be opened or closed simultaneously, which is more conducive to precisely adjusting the opening degree of the air vent 211, thereby obtaining a better air-fuel ratio.

[0060] In an alternative example, the sum of the projected areas of the two normally closed air vents 2111 in the direction perpendicular to the paper surface is the same as the projected area of the normally open air vent 2112. Assuming that the flow area of the normally closed air vent 2111 is S, then the flow area of the normally open air vent 2112 is 2S. When the normally closed air vents 2111 are all closed, the air outlet area of the air volume regulating plate 21 is S. When the normally closed air vents 2111 are all open, the air outlet area of the air volume regulating plate 21 is 3S. That is to say, the adjustment range of the air outlet area of the air volume regulating plate 21 is between S and 3S.

[0061] In some other embodiments of the present invention, as Figures 1 - 3 shown, the gas nozzle 112 includes a normally open gas nozzle 1122 corresponding to the normally open air vent 2112 and a normally closed gas nozzle 1121 corresponding to the normally closed air vent 2111. That is to say, the gas nozzle 112 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 1121 is opened or closed synchronously with the normally closed air vent 2111, so that the supply amounts of gas and air can be increased or decreased synchronously, ensuring that the gas mixer obtains a better air-fuel ratio.

[0062] In an alternative embodiment, as Figures 1 - 3 , Figures 6 - 8 shown, the gas nozzle 112 penetrates through the inner peripheral wall of the body and communicates with the gas flow channel. The impeller assembly 22 further includes a valve 223, and the valve 223 rotates synchronously with the rotating shaft 221 to control the opening degree of the normally closed gas nozzle 1121. That is, the gas nozzle 112 is formed on the inner wall of the gas flow channel. Since the valve 223 is integrally arranged on the rotating shaft 221, when the impeller 222 opens the normally closed air vent 2111, the valve 223 also synchronously opens the normally closed gas nozzle 1121. In this embodiment, the valve 223 and the impeller 222 are driven to rotate synchronously by the wind pressure, and the structural design is relatively simple, reducing the cost and space problems caused by additionally arranging other driving mechanisms.

[0063] In an alternative embodiment, as Figure 1 combined with Figures 4 - 8As shown in the figure, the impeller 222 is arranged at one end of the rotating shaft 221 on the same side as the windward surface of the air volume adjusting plate 21, and the valve 223 is arranged at the other end of the rotating shaft 221 on the same side as the leeward surface of the air volume adjusting plate 21. That is, the impeller 222 and the valve 223 are respectively located at both ends of the rotating shaft 221, so that the force on the rotating shaft is relatively uniform and the rotation is smoother.

[0064] In a specific embodiment, the impeller assembly 22 further includes: a connecting arm 224, one end of the connecting arm 224 is connected to the rotating shaft 221, and the other end of the connecting arm 224 is connected to the valve 223. Among them, the valve 223 is an arc-shaped plate that can fit the inner wall surface of the gas flow channel. Preferably, the connecting arm 224 is parallel to the center line of the impeller 222. Thus, it can be ensured that the impeller 222 and the valve 223 can move synchronously to open or close the normally closed air vent 2111 and the normally closed gas nozzle 1121 at the same time.

[0065] It can be understood that since the impeller assembly 22 is actuated by wind pressure, once there is not enough strong wind pressure in the gas flow channel, the impeller assembly 22 will stop rotating as a whole. In order to ensure that the impeller 222 and the valve 223 of the impeller assembly 22 can be reset in time, the weight of at least one impeller 222 is greater than that of the other impellers 222. In this way, it can be ensured that the impeller assembly 22 can reset itself, and the sensitivity and reliability of the long-term use of the gas regulating device can be guaranteed. Of course, other elastic reset mechanisms can also be set to reset the impeller assembly 22 in time when the fan stops running.

[0066] In other embodiments of the present invention, as Figures 1 - 3 shown, the premixing device 100 includes a reduced-diameter section 12, a throat section 13 with a constant cross-section, and a flared section 14 connected in sequence. The gas nozzle 112 and the air volume regulating device 20 are both arranged in the throat section 13. The inventor found in research and experiments that during the process of the air flow moving from the flared section 12 to the throat section 13, the wind speed will suddenly increase, forming a significant negative pressure, and how to suck the gas and air into the throat section 13 to make them fully mixed.

[0067] The gas equipment according to the embodiment of the present invention includes the gas mixer 100 of the above embodiment. Since the air-fuel ratio adjustment range of the gas mixer 100 according to the embodiment of the present invention is large and it can be applicable 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.

[0068] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but 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 horizontal height of the first feature is higher than that of 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 horizontal height of the first feature is less than that of the second feature.

[0069] In the description of the present specification, the description with reference to the terms "one 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 the present specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] 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 premixing device, characterized in that, it includes: a body that defines a gas flow path having an air inlet and a gas nozzle; a gas volume adjusting device disposed in the gas flow path for adjusting the gas volume and air volume participating in the mixing, and the mixing volume of the gas and air is positively correlated with the magnitude of the wind pressure at the air inlet; the gas volume adjusting device includes: an air volume adjusting plate disposed in the gas flow path and formed with a plurality of air vents oppositely arranged to the air inlet; an impeller assembly, the impeller assembly includes a rotating shaft passing through the air volume adjusting plate and a plurality of impellers disposed on the rotating shaft, the impellers and the air volume adjusting plate at least partially overlap in the projection in the direction perpendicular to the paper surface, and the impeller assembly is driven to rotate by the wind pressure, thereby changing the position of the impellers relative to the air volume adjusting plate; the air volume adjusting plate includes at least one normally closed air vent and at least one normally open air vent, and the impellers control the opening degree of the normally closed air vents; 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, the gas nozzle penetrates the inner peripheral wall of the body and communicates with the gas flow path, and the impeller assembly further includes a valve that rotates synchronously with the rotating shaft for controlling the opening degree of the normally closed gas nozzle.

2. The premixing device according to claim 1, characterized in that, the number of the normally closed air vents is two, the air volume adjusting plate is provided with two baffles, one of the baffles is located between the normally closed air vent and the normally open air vent, the other baffle is located between the two normally closed air vents, and the two radial sides of the normally open air vent are provided with limiting ribs.

3. The premixing device according to claim 2, characterized in that, one of the baffles is provided with a ventilation opening.

4. The premixing device according to claim 3, characterized in that, the projection areas of the two baffles and the two normally closed air vents in the direction perpendicular to the paper surface are the same.

5. The premixing device according to claim 3, characterized in that, the sum of the flow areas of the two normally closed air vents is the same as the flow area of the normally open air vent.

6. The premixing device according to claim 1, characterized in that, the impellers are disposed at one end of the rotating shaft on the same side as the windward surface of the air volume adjusting plate, and the valve is disposed at the other end of the rotating shaft on the same side as the leeward surface of the air volume adjusting plate.

7. The premixing device according to claim 6, characterized in that, the impeller assembly further includes: a connecting arm, one end of the connecting arm is connected to the rotating shaft, and the other end of the connecting arm is connected to the valve.

8. The premixing device according to claim 7, characterized in that, the connecting arm is parallel to the center line of the impellers.

9. The premixing device according to any one of claims 1-8, characterized in that, the weight of at least one of the impellers is greater than the weight of the remaining impellers.

10. The premixing device according to any one of claims 1-8, characterized in that, The premixing device includes a reduced-diameter section, a throat section with a constant cross-section, and a flared section connected in sequence, and the gas nozzle and the gas volume regulating device are both arranged in the throat section.

11. A gas equipment, characterized in that it includes: The premixing device according to any one of claims 1-10.

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