Premixing devices and gas equipment

Abstract

The present invention discloses a premixing device and a gas equipment, the premixing device comprising: a body, the body defining a gas flow passage with an air inlet and a gas nozzle; an air volume regulating plate, the air volume regulating plate being arranged in the gas flow passage and forming a plurality of normally closed air ports and normally open air ports arranged opposite to the air inlet; an impeller assembly, the impeller assembly comprising a rotating shaft penetrating the air volume regulating plate and a plurality of impellers arranged on the rotating shaft, at least one impeller always at least partially overlaps with the projection of the normally open air ports in a direction perpendicular to the paper surface, so that the impeller assembly is driven to rotate by wind pressure; and a valve plate. According to the premixing device of an embodiment of the present invention, an air volume regulating plate having a normally closed air port and a normally open air port is arranged in the gas flow passage, and the impeller assembly is driven to rotate by wind pressure, thereby driving the valve plate to rotate synchronously, and then the opening of the normally closed air port is changed by the valve plate, so as to adjust the air intake amount involved in the mixing and obtain a better air-fuel ratio.

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 equipment. Background Art

[0002] The Venturi in the related technology cannot effectively regulate gas and air, has a small combustion regulation ratio, and cannot meet the needs of gas equipment with different loads. Summary of the invention

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

[0004] To this end, the present invention proposes a premixing device, which has a good air-fuel ratio and strong versatility.

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

[0006] According to an embodiment of the present invention, the premixing device includes: a main body, which defines a gas flow channel with an air inlet and a gas nozzle; an air volume adjustment plate, which is arranged in the gas flow channel and forms a plurality of normally closed air ports and normally open air ports arranged opposite to the air inlet; an impeller assembly, which includes a rotating shaft passing through the air volume adjustment plate and a plurality of impellers arranged on the rotating shaft, at least one of the impellers always at least partially overlaps with the projection of the normally open air port in a direction perpendicular to the paper surface, so that the impeller assembly is driven to rotate by wind pressure; and a valve plate, which is connected to the rotating shaft and rotates synchronously with the impeller to adjust the opening of the normally closed air port.

[0007] According to the premixing device of the embodiment of the present invention, an air volume adjustment plate with a normally closed air port and a normally open air port is arranged in the gas flow channel, and the impeller assembly is driven to rotate by the wind pressure, thereby driving the valve plate to rotate synchronously, and then the opening of the normally closed air port is changed through the valve plate, so as to adjust the air intake volume participating in the mixing and obtain a better air-fuel ratio.

[0008] According to some embodiments of the present invention, the number of the gas nozzles includes multiple, some of which are normally open gas nozzles and the other part are normally closed gas nozzles, and the rotating shaft is also provided with a stop arm for adjusting the opening size of the normally closed gas nozzles.

[0009] In an optional embodiment, the air inlet is located at one axial end of the body, the mixed gas of fuel gas and air is located at the other axial end of the body, and the fuel gas nozzle is formed on the inner wall of the gas flow channel.

[0010] In a further optional embodiment, the number of the normally closed air outlets is two, the number of the normally open air outlet is one, the air volume adjustment plate includes two baffles, one of the baffles is located between the normally closed air outlet and the normally open air outlet, and the other baffle is located between the two normally closed air outlets, and two radial edges of the normally open air outlet are provided with limiting ribs.

[0011] In an optional example, the impeller assembly includes a first impeller, a second impeller and a third impeller, wherein the first impeller is arranged opposite to the normally open air outlet, the valve plate is staggered in the circumferential direction with the second impeller and the third impeller, respectively, and the projection area of ​​the impeller in the direction perpendicular to the paper surface is smaller than that of the valve plate.

[0012] In a further optional example, the projection areas of the two normally closed air vents in a direction perpendicular to the paper surface are the same.

[0013] According to some embodiments of the present invention, the weight on at least one of the impellers is greater than the weight of the remaining impellers.

[0014] According to some embodiments of the present invention, the premixing device comprises a constriction section, a throat section with a constant cross section and a flaring section which are connected in sequence, and the gas nozzle and the gas volume regulating device are both arranged in the throat section.

[0015] According to some embodiments of the present invention, the valve plate is located on the windward side of the air volume adjustment plate, and the impeller is located on the leeward side of the air volume adjustment plate.

[0016] The gas equipment according to the embodiment 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, 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 optimal.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic structural diagram of a premixing device according to some embodiments of the present invention;

[0020] Figure 2 is a schematic structural diagram of a premixing device from another angle according to some embodiments of the present invention;

[0021] Figure 3is a schematic structural diagram of a premixing device from another angle according to some embodiments of the present invention;

[0022] Figure 4 is a schematic diagram of the structure of an impeller assembly according to some embodiments of the present invention;

[0023] Figure 5 is a schematic structural diagram of an impeller assembly from another angle according to some embodiments of the present invention;

[0024] Figure 6 is a top view of an impeller assembly according to some embodiments of the present invention;

[0025] Figure 7 is an assembly diagram of a valve plate and a rotating shaft according to some embodiments of the present invention;

[0026] Figure 8 is an assembly diagram of the valve plate and the rotating shaft at another angle according to some embodiments of the present invention;

[0027] Fig. 9 is an assembly diagram of the valve plate and the rotating shaft at another angle according to some embodiments of the present invention;

[0028] Fig.10 It is an assembly diagram of the valve plate and the rotating shaft at another angle according to some embodiments of the present invention.

[0029] Reference numerals:

[0030] Premixing device 10;

[0031] Body 11; gas flow channel 111; air inlet 112; gas nozzle 113; normally open gas nozzle 1131; normally closed gas nozzle 1132; constricted section 114; throat section 115; expanded section 116;

[0032] Air volume regulating plate 12; normally closed air outlet 121; normally open air outlet 122; baffle 123; vent 1231; limiting rib 124;

[0033] Impeller assembly 13; impeller 131; first impeller 1311; second impeller 1312; third impeller 1313; rotating shaft 132; blocking arm 133; first sleeve 134; valve plate 135; second sleeve 136;

[0034] Housing 16. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] Refer to the following Figure 1-Figure 10 The premixing device 10 of the embodiment of the present invention is described. The premixing device 10 can premix gases of different media to obtain a uniformly mixed gas mixture. For example, when the gas enters the combustion chamber of the gas equipment for combustion, the gas and air can enter the premixing device 10 in advance for premixing, and the gas after the air and gas mixture enters the combustion chamber for full and effective combustion. The gas equipment herein includes but is limited to strong extraction type gas equipment and strong drum type gas equipment.

[0037] Reference Figure 1-Figure 3 The premixing device 10 includes: a body 11, an air volume adjustment plate 12, an impeller assembly 13 and a valve plate 135.

[0038] The body 11 defines a gas flow channel 111 having an air inlet 112 and a gas nozzle 113. The air volume regulating plate 12 is disposed in the gas flow channel 111 and is formed with a plurality of normally closed air ports 121 and normally open air ports 122 disposed opposite to the air inlet 112. In other words, the air entering from the air inlet 112 can pass through the normally closed air ports 121 and the normally open air ports 122. Under any operating conditions, the normally open air ports 122 are in an open state, and the normally closed air ports 121 are selectively opened and closed. In other words, the air volume regulating plate 12 is a shutoff plate. When the normally closed air ports 121 are in a closed state, a portion of the air can pass through the normally open air ports 122 of the air volume regulating plate, and another portion of the air is cut off.

[0039] The impeller assembly 13 includes a rotating shaft 132 that passes through the air volume adjustment plate 12 and a plurality of impellers 131 disposed on the rotating shaft 132. At least one impeller 131 always overlaps at least partially with the projection of the normally open air outlet 122 in the direction perpendicular to the paper surface, thereby driving the impeller assembly 13 to rotate by wind pressure. Since the normally open air outlet 122 is always connected to the air inlet 112, the air flow can blow on at least one impeller 131, and when the wind pressure is large enough, the impeller 131 can be driven to rotate, thereby driving the remaining impellers 131 to rotate.

[0040] The valve plate 135 is connected to the rotating shaft 132 and rotates synchronously with the impeller 131 to adjust the opening of the normally closed air outlet 121. In other words, the valve plate 135 and the impeller 131 are linked by the rotating shaft 132, so that the impeller 131 and the valve plate 135 rotate simultaneously, thereby changing the position of the valve plate 135 relative to the normally closed air outlet 121 to change the opening of the normally closed air outlet 121, thereby adjusting the amount of air passing through the air volume adjustment plate 12. Among them, the impeller 131 can be formed on the first sleeve 134, the first sleeve 134 is tightly connected to the rotating shaft 132, and the valve plate 135 can be sleeved on the rotating shaft 132 through the second sleeve 136, such as Figure 4-Figure 10 shown.

[0041] It should be noted that the air inlet of the premixing device 10 is connected to the air outlet of the fan, and the air inlet pressure of the premixing device 10 is the same as the air outlet pressure of the fan. In other words, the opening of the normally closed air port 121 depends on the output air pressure of the fan, so that the opening of the normally closed air port 121 can be associated with the relevant parameters of the fan, and the amount of air involved in the mixing can be more accurately controlled, thereby obtaining a better air-fuel ratio.

[0042] In addition, the premixing device 10 further includes a shell 16 , and the body 11 is embedded in the shell 16 . The outer wall surface of the premixing device 10 and the shell 16 form a gas channel, and the gas channel is communicated with the gas nozzle 113 .

[0043] Therefore, according to the premixing device 10 of the embodiment of the present invention, an air volume adjustment plate 12 having a normally closed air port 121 and a normally open air port 122 is arranged in the gas flow channel 111, and the impeller assembly 13 is driven to rotate by wind pressure, thereby driving the valve plate 135 to rotate synchronously, and then the opening of the normally closed air port 121 is changed by the valve plate 135, so as to adjust the air intake volume participating in the mixing and obtain a better air-fuel ratio.

[0044] In some embodiments of the present invention, the number of gas nozzles 113 includes multiple ones, one part of which is a normally open gas nozzle 1131, and the other part is a normally closed gas nozzle 1132. The rotating shaft 132 is also provided with a stop arm 133 for adjusting the opening size of the normally closed gas nozzle 1132. In other words, the gas nozzles 113 are also divided into two categories, one is normally open, and the other is normally closed (i.e., selectively open), wherein the normally closed gas nozzle 1132 is opened or closed by a stop arm 133 connected to the rotating shaft 132, so that the supply of gas and air can be increased or decreased synchronously, ensuring that the gas mixer obtains a better air-fuel ratio.

[0045] In an optional embodiment, the air inlet 112 is located at one axial end of the body 11, the mixed gas of the gas and the air is located at the other axial end of the body 11, and the gas nozzle is formed on the inner wall of the gas flow channel 111. That is, the gas flow channel 111 extends in the axial direction, the air inlet 112 is located at the axial end of the body 11, and the gas nozzle is sprayed into the gas flow channel 111 from the circumferential direction to achieve the mixing of the gas and the air.

[0046] In an optional embodiment, if Figure 1 Combination Figure 2As shown, the number of normally closed air ports 121 is two, the number of normally open air ports 122 is one, the air volume adjustment plate 12 includes two baffles 123, one baffle 123 is located between the normally closed air ports 121 and the normally open air ports 122, the other baffle 123 is located between the two normally closed air ports 121, and two radial edges of the normally open air ports 122 are provided with limiting ribs 124. In other words, the air volume adjustment plate 12 is divided into the normally closed air ports 121 and the normally open air ports 122 by the two baffles 123, and at least part of the air flow is cut off, so that the flow area of ​​the air volume adjustment plate 12 is smaller than the flow area of ​​the air inlet 112, thereby further accelerating the flow rate of the air flow.

[0047] In a further optional example, at least one baffle 123 is provided with a vent 1231, and when the normally closed air port 121 is in a closed state, the vent 1231 is opposite to one of the impellers 131. In this way, the airflow can act on the impeller 131 through the vent 1231, so that at least two impellers 131 of the impeller assembly 13 can be driven by wind pressure at the same time, and the impeller assembly 13 and the valve plate 135 can be driven to rotate under the action of a relatively small wind pressure, thereby preventing the impeller assembly 13 from being stuck.

[0048] In a specific embodiment, Figure 1 As shown, the impeller assembly 13 includes a first impeller 131, a second impeller 131 and a third impeller 131, wherein the first impeller 131 is arranged opposite to the normally open air outlet 122, and the valve plate 135 is staggered with the second impeller 131 and the third impeller 131 in the circumferential direction, respectively, and the projection area of ​​the impeller 131 in the direction perpendicular to the paper surface is smaller than that of the valve plate 135.

[0049] That is, when the second impeller 131 and the third impeller 131 approach the normally closed air port 121, the valve plate 135 moves away from the normally closed air port 121. Since the projection area of ​​the impeller 131 in the direction perpendicular to the paper surface is smaller than the valve plate 135, when the second and third impellers 131 rotate to the normally closed air port 121, the second and third impellers 131 partially overlap with the closed normally closed air port 121 and will not close the normally closed air port 121. In this way, not only the amount of air intake involved in the mixing can be adjusted, but also the normal rotation of the impeller assembly 13 can be ensured to avoid its jamming.

[0050] Assuming that the first impeller 131 rotates between the first position and the second position, when the first impeller 131 is at the first position, the opening of the normally closed air port 121 is zero, and when the first impeller 131 is at the second position, the opening of the normally closed air port 121 is maximum. In order to adjust the amount of air involved in mixing to the greatest extent, the projection areas of the two normally closed air ports 121 in the direction perpendicular to the paper are the same, thereby ensuring that the two normally closed air ports 121 can be opened or closed synchronously during the rotation of the valve plate 135 driven by the impeller assembly 13.

[0051] In other embodiments of the present invention, the weight of at least one impeller 131 is greater than the weight of the other impellers 131. In this way, it can be ensured that the impeller assembly 13 can be reset when the wind pressure is small, and the valve plate 135 can reliably adjust the opening of the normally closed air port 121.

[0052] In other embodiments of the present invention, Figure 1-Figure 3 As shown, the premixing device 10 includes a constriction section 114, a throat section 115 with a constant cross section, and a flare section 116 connected in sequence, and the gas nozzle and the gas volume regulating device are both arranged in the throat section 115. The inventors have found in their research experiments that when the airflow moves from the flare section 116 to the throat section 115, the wind speed will suddenly increase, forming a significant negative pressure, and how to inhale the gas and air into the throat section 115 so that they are fully mixed.

[0053] In other embodiments of the present invention, the valve plate 135 is located on the leeward side of the air volume adjustment plate, and the impeller 131 is located on the windward side of the air volume adjustment plate. In this way, the impeller assembly 13 can be located at one end of the rotating shaft 132, and the valve plate 135 can be located at the other end of the rotating shaft 132, so that the forces on both ends of the rotating shaft 132 are relatively uniform, and the valve plate 135 and the impeller 131 are prevented from interfering with each other during the rotation process.

[0054] The gas equipment according to the embodiment of the present invention comprises the premixing device 100 of the above embodiment. Since the air-fuel ratio adjustment range of the premixing device 100 according to the embodiment of the present invention is large, it can be applied to gas equipment with different load requirements. Therefore, the gas equipment according to the embodiment of the present invention has an optimal air-fuel ratio.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this 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.

[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A premixing device, characterized in that: include: a body defining a gas flow passage having an air inlet and a gas nozzle; An air volume regulating plate, the air volume regulating plate being arranged in the gas flow channel and forming a plurality of normally closed air ports and normally open air ports arranged opposite to the air inlet; An impeller assembly, the impeller assembly comprising: A rotating shaft passing through the air volume adjustment plate and a plurality of impellers arranged on the rotating shaft, at least one of the impellers always at least partially overlaps with the projection of the normally open air outlet in a direction perpendicular to the paper surface, so that the impeller assembly is driven to rotate by wind pressure; A valve plate, the valve plate is connected to the rotating shaft and rotates synchronously with the impeller to adjust the opening of the normally closed air port; the number of the gas nozzles includes multiple, some of which are normally open gas nozzles, and the other part are normally closed gas nozzles, and the rotating shaft is also provided with a baffle arm for adjusting the opening size of the normally closed gas nozzles; the air inlet of the premixing device is connected to the air outlet of the fan, and the air inlet pressure of the premixing device is the same as the air outlet pressure of the fan.

2. The premixing device according to claim 1, characterized in that: The air inlet is located at one axial end of the body, the mixed gas of the fuel gas and the air is located at the other axial end of the body, and the fuel gas nozzle is formed on the inner wall of the gas flow channel.

3. The premixing device according to claim 2, characterized in that: The number of the normally closed air outlets is two, the number of the normally open air outlet is one, the air volume adjustment plate includes two baffles, one of the baffles is located between the normally closed air outlet and the normally open air outlet, and the other baffle is located between the two normally closed air outlets, and the two radial edges of the normally open air outlet are provided with limiting ribs.

4. The premixing device according to claim 3, characterized in that: At least one of the baffles is provided with a vent, and when the normally closed air port is in a closed state, the vent is opposite to one of the impellers.

5. The premixing device according to claim 3, characterized in that: The impeller assembly includes a first impeller, a second impeller and a third impeller, wherein the first impeller is arranged opposite to the normally open air outlet, the valve plate is staggered with the second impeller and the third impeller in the circumferential direction, and the projection area of ​​the impeller in the direction perpendicular to the paper surface is smaller than that of the valve plate.

6. The premixing device according to claim 5, characterized in that: The projection areas of the two normally closed air vents in a direction perpendicular to the paper surface are the same.

7. The premixing device according to any one of claims 1 to 6, characterized in that: The weight on at least one of the impellers is greater than the weight on the remaining impellers.

8. The premixing device according to any one of claims 1 to 6, characterized in that: The premixing device comprises a constriction section, a throat section with a constant cross section and a flaring section which are connected in sequence, and the gas nozzle and the air volume regulating plate are both arranged at the throat section.

9. The premixing device according to any one of claims 1 to 6, characterized in that: The valve plate is located on the windward side of the air volume regulating plate, and the impeller is located on the leeward side of the air volume regulating plate.

10. A gas equipment, characterized in that: include: The premixing device according to any one of claims 1 to 9.

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