Premixer and fuel gas equipment

Abstract

The invention discloses a premixer and fuel gas equipment, and relates to the technical field of fuel gas heat supply, and the premixer comprises a shell, a lining and an adjusting plate; the shell is provided with an inner cavity as well as an air inlet and a gas inlet which are communicated with the inner cavity; the lining is arranged in the inner cavity and provided with an air flow channel communicated with the air inlet and a fuel gas flow channel communicated with the fuel gas inlet, a fuel gas standing cavity is formed by the outer side of the lining and the cavity wall of the inner cavity, and the fuel gas inlet is communicated with the fuel gas flow channel through the fuel gas standing cavity; the adjusting plate is arranged in the inner cavity and provided with an air outlet communicating with the air flow channel and a fuel gas outlet communicating with the fuel gas flow channel. The adjusting plate is matched with the lining and used for adjusting the size of the first communication area of the air outlet and the air flow channel and the size of the second communication area of the gas outlet and the gas flow channel. According to the technical scheme provided by the invention, the stability of gas pressure can be ensured during gas supply.

Description

Technical Field

[0001] The invention relates to the technical field of gas heating, and in particular to a premixer and gas equipment. Background Art

[0002] Gas appliances such as gas water heaters, wall-mounted boilers, gas stoves, etc. are usually divided into diffusion combustion, partial premixed combustion and full premixed combustion. Among them, full premixed combustion refers to the process in which air and gas are fully mixed in a certain proportion to form premixed air, and the premixed air is ignited and burned in the burner.

[0003] As people's requirements for the heating quality of gas equipment gradually increase, gas water heaters are required to have more precise power control, so gas equipment needs to have a larger broadband power regulation to meet users' needs for different powers. Among them, the premixer is an important component in the fully premixed gas equipment to adjust the stability of the gas and air equivalence ratio and affect the load regulation ratio. Its structure and performance directly affect the load regulation range of the gas equipment.

[0004] The premixer in the related art cannot ensure the stability of the gas pressure when supplying gas. Summary of the invention

[0005] The main purpose of the present invention is to provide a premixer and a gas equipment, aiming to ensure the stability of the gas pressure when supplying gas.

[0006] To achieve the above object, the present invention provides a premixer, comprising:

[0007] A shell having an inner cavity and an air inlet and a gas inlet communicating with the inner cavity;

[0008] An inner liner is arranged in the inner cavity and is provided with an air flow channel communicating with the air inlet and a gas flow channel communicating with the gas inlet, a gas retention cavity is formed between the outer side of the inner liner and the cavity wall of the inner cavity, and the gas inlet is connected to the gas flow channel through the gas retention cavity;

[0009] An adjusting plate is arranged in the inner cavity and is provided with the air outlet connected to the air flow channel and the gas outlet connected to the gas flow channel; the adjusting plate cooperates with the liner to adjust the size of a first connecting area between the air outlet and the air flow channel, and the size of a second connecting area between the gas outlet and the gas flow channel.

[0010] In one embodiment of the present application, the gas storage cavity is extended along the circumferential direction of the liner, and the gas inlet is arranged on the peripheral side wall of the inner cavity.

[0011] In one embodiment of the present application, the liner includes a liner front section and a liner rear section distributed along the axial direction, and the adjustment plate is arranged on a side of the liner rear section away from the liner front section; the outer side of the liner rear section and the cavity wall of the inner cavity form the gas retention cavity.

[0012] In one embodiment of the present application, the rear section of the liner includes:

[0013] Two discs are spaced apart along the axial direction of the shell, and one of the discs is disposed close to the front section of the liner;

[0014] A connecting part connects the two disk bodies, the size of the connecting part is smaller than the size of the disk bodies, and the outer side of the connecting part and the cavity wall of the inner cavity form the gas retention cavity.

[0015] In one embodiment of the present application, the gas flow channel is provided on the disc body away from the front section of the liner.

[0016] In one embodiment of the present application, the width of the gas cavity gradually increases from a side away from the gas flow channel to a side close to the gas flow channel.

[0017] In one embodiment of the present application, a first seal and a second seal are respectively provided between the outer sides of the two disks and the cavity wall of the inner cavity, and the first seal and the second seal are respectively provided on both sides of the gas cavity.

[0018] In one embodiment of the present application, a first limiting groove is provided on the cavity wall of the inner cavity and / or on the outer side of one of the disc bodies, and the first sealing member is clamped in the first limiting groove;

[0019] And / or, a second limiting groove is provided on the cavity wall of the inner cavity and / or the outer side of the other disk body, and the second sealing member is clamped in the second limiting groove.

[0020] In one embodiment of the present application, the front section of the liner is provided with a front section flow channel, and the rear section of the liner is provided with a rear section flow channel. The front section flow channel and the rear section flow channel are connected and constitute the air flow channel, and the cross-sectional area of ​​the front section flow channel is greater than the cross-sectional area of ​​the rear section flow channel.

[0021] In one embodiment of the present application, in the direction from the front section of the liner to the rear section of the liner, the cross-sectional area of ​​the front section flow channel gradually decreases;

[0022] And / or, in the direction from the front section of the liner to the rear section of the liner, the cross-sectional area of ​​the rear section flow channel gradually decreases.

[0023] In one embodiment of the present application, the adjustment plate is coaxially arranged with the liner, and one of the liner and the adjustment plate can rotate coaxially relative to the other, so as to adjust the size of a first connecting area between the air outlet and the air flow channel, and the size of a second connecting area between the gas outlet and the gas flow channel.

[0024] In one embodiment of the present application, the size of the first connected area is positively correlated with the size of the second connected area.

[0025] In one embodiment of the present application, the liner is fixed to the outer shell, and the premixer further comprises a driving assembly drivingly connected to the adjustment plate, and the driving assembly drives the adjustment plate to rotate relative to the liner.

[0026] In one embodiment of the present application, one of the lining and the adjustment plate is provided with a limiting groove, and the other is provided with a limiting column, and the limiting column cooperates with the limiting groove to limit the relative rotation angle of the lining and the adjustment plate.

[0027] To achieve the above object, the present invention further provides a gas device, comprising the premixer as described above.

[0028] The technical solution of the present invention can accurately adjust the size of the first connecting area between the air outlet and the air flow channel, and can also accurately adjust the size of the second connecting area between the gas outlet and the gas flow channel by providing a lining and an adjustment plate that cooperate with each other in the inner cavity of the shell, thereby realizing switching between a high load state and a low load state, so as to achieve proportional flow regulation of air and gas under high load state and low load state, effectively broadening the thermal load regulation ratio of the premixer, realizing a wide range of load regulation of the gas equipment, and giving users a better experience in heating.

[0029] In addition, a gas cavity is formed on the outer side of the liner and the cavity wall of the inner cavity. The gas enters the gas cavity from the gas inlet, and the gas pressure is first stabilized by the gas cavity, and then enters the gas flow channel from the gas cavity. This can make the pressure of the incoming gas more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 A schematic structural diagram of an embodiment of a premixer provided by the present invention;

[0032] Figure 2 A cross-sectional view of an embodiment of a premixer provided by the present invention;

[0033] Figure 3 An exploded view of a premixer according to an embodiment of the present invention from a first perspective;

[0034] Figure 4 An exploded view of another perspective of an embodiment of a premixer provided by the present invention;

[0035] Figure 5 An exploded view of a part of the structure of a premixer according to an embodiment of the present invention from a first perspective;

[0036] Figure 6 An exploded view of a part of the structure of an embodiment of a premixer provided by the present invention from another perspective;

[0037] Figure 7 A partial structural schematic diagram of an embodiment of a premixer provided by the present invention;

[0038] Figure 8 A partial structural schematic diagram of an embodiment of a premixer provided by the present invention under a heavy load state;

[0039] Fig. 9 A partial structural schematic diagram of an embodiment of a premixer provided by the present invention under a light load state.

[0040] Description of Figure Numbers:

[0041] Label name Label name 100 Premixer 241 Plate 10 shell 242 Connection 11 Air Inlet 25 Limit slot 12 Gas import 26 Gas cavity 13 Gas connector 27 First seal 14 Second sealing ring 28 Second seal 17 The first limit slot 20a Avoidance channel 18 The second limit slot 20b Avoidance slot 20 Lining 30 Adjustment plate 21 Air duct 31 Air outlet 21a Front runner 32 Gas outlet 21b Back section flow channel 33 Limit column 211 Heavy-duty air flow channel 40 Drive components 212 Small load air flow channel 41 Drive motor 22 Gas flow channel 411 Output shaft 221 Heavy-load gas flow path 4111 Output gear 221a Gas sub-channel 42 transmission shaft 222 Small load air flow channel 421 First sealing ring 23 Lining front section 422 Transmission gear 24 Lining rear section

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] Gas appliances such as gas water heaters, wall-mounted boilers, gas stoves, etc. are usually divided into diffusion combustion, partial premixed combustion and full premixed combustion. Among them, full premixed combustion refers to the process in which air and gas are fully mixed in a certain proportion to form premixed air, and the premixed air is ignited and burned in the burner.

[0047] As people's requirements for the heating quality of gas equipment gradually increase, gas water heaters are required to have more precise power control, so gas equipment needs to have a larger broadband power regulation to meet users' needs for different powers. Among them, the premixer is an important component in the fully premixed gas equipment to adjust the stability of the gas and air equivalence ratio and affect the load regulation ratio. Its structure and performance directly affect the load regulation range of the gas equipment.

[0048] When the premixer in the related art supplies gas, the gas pressure cannot be kept stable when the gas directly enters the gas flow channel from the gas inlet due to the small cross-sectional area of ​​the gas flow channel.

[0049] Based on this, the present invention proposes a premixer 100, which is intended to ensure the stability of gas pressure when supplying gas. The premixer 100 can be applied to gas appliances such as gas water heaters, wall-mounted boilers, and gas stoves. The gas appliance may also include a burner and a fan. After the air and gas flowing out of the air outlet 31 and the gas outlet 32 ​​of the premixer 100 are mixed into premixed air, the premixed air enters the burner under the action of the fan and flows out of the burner through the burner's fire hole to achieve ignition and combustion. The structure of the premixer 100 will be described below in the form of an embodiment.

[0050] See also Figures 1 to 4In one embodiment of the present invention, the premixer 100 includes an outer shell 10, an inner liner 20 and an adjusting plate 30; the outer shell 10 is provided with an inner cavity and an air inlet 11 and a gas inlet 12 connected to the inner cavity; the inner liner 20 is provided in the inner cavity and is provided with an air flow channel 21 connected to the air inlet 11 and a gas flow channel 22 connected to the gas inlet 12, and a gas retention cavity 26 is formed between the outer side of the inner liner 20 and the cavity wall of the inner cavity, and the gas inlet 12 is connected to the gas flow channel 22 through the gas retention cavity 26; the adjusting plate 30 is provided in the inner cavity and is provided with an air outlet 31 connected to the air flow channel 21 and a gas outlet 32 ​​connected to the gas flow channel 22; the adjusting plate 30 cooperates with the inner liner 20 to adjust the size of a first connecting area between the air outlet 31 and the air flow channel 21, and the size of a second connecting area between the gas outlet 32 ​​and the gas flow channel 22.

[0051] In this embodiment, the shell 10 plays a role in supporting the liner 20 and the adjustment plate 30. The shell 10 is provided with an inner cavity, an air inlet 11 and a gas inlet 12. It can be understood that the air entering from the air inlet 11 can flow to the air flow channel 21 of the liner 20, and will flow through the front section flow channel 21a and the rear section flow channel 21b of the air flow channel 21 in sequence, and then flow out from the air outlet 31 of the adjustment plate 30; the gas entering from the gas inlet 12 can flow to the gas flow channel 22 of the liner 20, and then flow out from the gas outlet 32 ​​of the adjustment plate 30. Before this, the size of the first communication area between the air outlet 31 and the air flow channel 21 can be adjusted, and the size of the second communication area between the gas outlet 32 ​​and the gas flow channel 22 can be adjusted to achieve the adjustment of the air volume and the gas volume, that is, to adjust the mixing ratio of air and gas, and to achieve the heat load adjustment of the premixer 100 in a wide range.

[0052] In actual application, a gas connector 13 may be provided at the gas inlet 12 to facilitate the installation of the pipe connection between the gas inlet 12 and the external gas supply equipment. Optionally, in order to improve the connection sealing between the gas connector 13 and the gas inlet 12 to prevent gas leakage, a second sealing ring 14 may be installed between the gas connector 13 and the gas inlet 12 to seal the connection between the gas connector 13 and the gas inlet 12 through the second sealing ring 14. Optionally, in order to facilitate the installation of the second sealing ring 14, a sink may be provided on the outer side wall of the housing 10 where the gas inlet 12 is provided, so that the second sealing ring 14 is installed on the sink, so that the second sealing ring 14 is clamped between the sink and the gas connector 13.

[0053] In practical application, the air inlet 11 can be arranged on the peripheral wall surface of the inner cavity of the shell 10, or on the end wall surface of the inner cavity of the shell 10. Similarly, the gas inlet 12 can be arranged on the peripheral wall surface of the inner cavity of the shell 10, or on the end wall surface of the inner cavity of the shell 10.

[0054] In one embodiment, the air inlet 11 can be set on one end wall of the inner cavity of the shell 10, and the other end wall of the inner cavity of the shell 10 can be provided with a mixed air outlet 31, which can serve as an installation interface of the fan. After the air and gas flowing out from the air outlet 31 and the gas outlet 32 ​​are mixed, they can enter the burner from the mixed air outlet 31 under the negative pressure generated by the fan.

[0055] In practical applications, the shape and structure of the air inlet 11 can be determined according to actual conditions, such as circular, sector-shaped, square, strip-shaped or other shapes, etc. The shape and structure of the gas inlet 12 can also be determined according to actual conditions, such as circular, sector-shaped, square, strip-shaped or other shapes, etc.

[0056] In this embodiment, the liner 20 is a Venturi liner 20, that is, the fluid flowing through the Venturi liner 20 produces a Venturi effect, which is manifested in that when the restricted flow passes through a reduced flow cross section, the fluid velocity increases, and the flow velocity is inversely proportional to the flow cross section. According to Bernoulli's principle, the increase in flow velocity is accompanied by a decrease in fluid pressure, which is the common Venturi phenomenon. In layman's terms, this effect refers to the low pressure generated near the high-speed flowing fluid, thereby producing an adsorption effect.

[0057] In summary, the technical solution of the present invention can accurately adjust the size of the first connecting area between the air outlet 31 and the air flow channel 21 by providing a lining 20 and an adjustment plate 30 that cooperate with each other in the inner cavity of the shell 10, and can also accurately adjust the size of the second connecting area between the gas outlet 32 ​​and the gas flow channel 22, thereby realizing the switching between the high load state and the low load state, so as to realize the proportional flow regulation of air and gas under the high load state and the low load state, effectively broadening the thermal load regulation ratio of the premixer 100, realizing a wide range of load regulation of the gas equipment, and making the user experience better for heating.

[0058] In addition, a gas cavity 26 is formed on the outer side of the liner 20 and the cavity wall of the inner cavity. The gas enters the gas cavity 26 from the gas inlet 12, and the gas pressure is first stabilized by the gas cavity 26, and then enters the gas flow channel 22 from the gas cavity 26, so that the pressure of the incoming gas can be more stable.

[0059] See also Figure 2 In one embodiment of the present invention, the gas cavity 26 is extended along the circumference of the liner 20, and the gas inlet 12 is arranged on the peripheral side wall of the cavity.

[0060] In this way, by extending the gas cavity 26 along the circumferential direction of the liner 20 , the space of the gas cavity 26 can be effectively increased, and the pressure stability of the incoming gas can be further improved.

[0061] For further information, see Figures 2 to 6 The liner 20 includes a liner front section 23 and a liner rear section 24 distributed along the axial direction, and the adjustment plate 30 is arranged on the side of the liner rear section 24 away from the liner front section 23; the outer side of the liner rear section 24 and the cavity wall of the inner cavity form a gas retention cavity 26.

[0062] With such arrangement, by making the liner 20 include an axially distributed liner front section 23 and a liner rear section 24, the design of the liner front section 23 can extend the axial length of the original liner 20, and the air entering from the air inlet 11 can first enter the front section flow channel 21a of the liner front section 23 for buffering, and then flow to the rear section flow channel 21b of the liner rear section 24, which can effectively slow down the sudden change of air flowing through the air flow channel 21 of the liner 20, thereby making the air circulation more effective.

[0063] For further information, see Figure 5 , Figure 6 The rear section 24 of the liner includes two disk bodies 241 and a connecting portion 242; the two disk bodies 241 are spaced apart along the axial direction of the outer shell 10, and one of the disk bodies 241 is arranged close to the front section 23 of the liner; the connecting portion 242 connects the two disk bodies 241, the size of the connecting portion 242 is smaller than the size of the disk bodies 241, and the outer side of the connecting portion 242 and the wall of the inner cavity form a gas retention cavity 26.

[0064] In this embodiment, the two disk bodies 241 are connected by the connecting portion 242 so that the two disk bodies 241 and the connecting portion 242 can form an I-shaped structure.

[0065] With such arrangement, after the liner rear section 24 is installed in the inner cavity of the outer shell 10 , the two disks 241 , the connecting portion 242 and the cavity wall of the inner cavity can enclose a gas cavity 26 , so that both sides of the gas cavity 26 can be sealed by the two disks 241 .

[0066] For further information, see Figure 5 , Figure 6 A gas flow channel 22 is provided on the disc body 241 away from the front section 23 of the liner.

[0067] In this embodiment, the gas flow channel 22 is arranged on a disk body 241 away from the front section 23 of the liner, and both ends of the gas flow channel 22 pass through both sides of the disk body 241, so that one end of the gas flow channel 22 is directly connected to the gas cavity 26, and the other end of the gas flow channel 22 is directly connected to the gas outlet 32 ​​of the adjustment plate 30. After the gas enters the gas cavity 26 through the gas inlet 12, it flows directly from the gas flow channel 22 to the gas outlet 32 ​​of the adjustment plate 30, so that the circulation of the incoming gas is more efficient and the pressure is more stable.

[0068] For further information, see Figure 2The width of the gas cavity 26 gradually increases from the side away from the gas flow channel 22 to the side close to the gas flow channel 22. It can be understood that the cross-section of the gas cavity 26 is trapezoidal.

[0069] In this arrangement, since the rear section flow channel 21b is provided at a position close to the gas retention cavity 26 of the liner rear section 24, and the cross-sectional area of ​​the rear section flow channel 21b gradually decreases from the liner front section 23 to the liner rear section 24, the width of the gas retention cavity 26 is gradually increased from the side away from the gas flow channel 22 to the side close to the gas flow channel 22, the space of the gas retention cavity 26 can be effectively increased on the basis of the limited volume of the liner rear section 24, so as to further improve the pressure stability of the incoming gas.

[0070] See also Figure 2 In one embodiment of the present invention, a first seal 27 and a second seal 28 are respectively disposed between the outer sides of the two disks 241 and the cavity wall of the inner cavity. The first seal 27 and the second seal 28 are disposed on both sides of the gas cavity 26 .

[0071] In this way, by providing the first seal 27 and the second seal 28 on both sides of the gas cavity 26, the gas cavity 26 can be sealed by the first seal 27 and the second seal 28 to prevent the gas from leaking from the gap between the liner 20 and the inner cavity wall, which may cause safety hazards on the wall surface and waste resources.

[0072] In this embodiment, the first sealing member 27 and the second sealing member 28 are both annular sealing rings and are extended along the circumference of the liner 20 .

[0073] Furthermore, a first limiting groove 17 is provided on the cavity wall of the inner cavity and / or the outer side of one of the disk bodies 241, and a first sealing member 27 is clamped in the first limiting groove 17; and / or a second limiting groove 18 is provided on the cavity wall of the inner cavity and / or the outer side of the other disk body 241, and a second sealing member 28 is clamped in the second limiting groove 18.

[0074] In this way, by clamping the first sealing member 27 in the first limiting groove 17, the first sealing member 27 can be limited to improve the installation reliability of the first sealing member 27. Similarly, by clamping the second sealing member 28 in the second limiting groove 18, the second sealing member 28 can be limited to improve the installation reliability of the second sealing member 28.

[0075] See also Figure 2 In one embodiment of the present invention, the front section 23 of the liner is provided with a front section flow channel 21a, and the rear section 24 of the liner is provided with a rear section flow channel 21b. The front section flow channel 21a and the rear section flow channel 21b are connected to form an air flow channel 21, and the cross-sectional area of ​​the front section flow channel 21a is greater than the cross-sectional area of ​​the rear section flow channel 21b.

[0076] With such arrangement, the air entering from the air inlet 11 can more smoothly enter the front section flow channel 21a with a larger cross-sectional area for buffering, and then be guided through the front section flow channel 21a to the rear section flow channel 21b with a smaller cross-sectional area, thereby improving the air circulation effect.

[0077] In actual application, the cross-sectional areas of the front section flow channel 21 a on the flow path may be the same or different; similarly, the cross-sectional areas of the rear section flow channel 21 b on the flow path may be the same or different.

[0078] Furthermore, in the direction from the liner front section 23 to the liner rear section 24, the cross-sectional area of ​​the front section flow channel 21a gradually decreases. It can be understood that the cross-sectional area of ​​the front section flow channel 21a gradually decreases in the air flow direction.

[0079] With such arrangement, the air entering from the air inlet 11 can more smoothly enter the front section flow channel 21a from the end with a larger cross-sectional area for buffering, and then be guided to the rear section flow channel 21b through the front section flow channel 21a, which can better slow down the sudden change of air when flowing through the air flow channel 21 of the liner 20, thereby making the air circulation more effective.

[0080] Furthermore, in the direction from the liner front section 23 to the liner rear section 24, the cross-sectional area of ​​the rear section flow channel 21b gradually decreases. It can be understood that the cross-sectional area of ​​the rear section flow channel 21b gradually decreases in the air flow direction.

[0081] With such arrangement, air can more smoothly enter the rear section flow channel 21b from the end with a larger cross-sectional area, which can further slow down the sudden change of air when flowing through the air flow channel 21 of the liner 20, thereby making the air circulation more effective.

[0082] See also Figures 7 to 9 In one embodiment of the present invention, the adjustment plate 30 is coaxially arranged with the liner 20, and one of the liner 20 and the adjustment plate 30 can rotate coaxially relative to the other, so as to adjust the size of the first connecting area between the air outlet 31 and the air flow channel 21, and the size of the second connecting area between the gas outlet 32 ​​and the gas flow channel 22.

[0083] In this embodiment, one of the liner 20 and the adjustment plate 30 can rotate coaxially relative to the other. It can be understood that the liner 20 is fixed relative to the shell 10, and the adjustment plate 30 rotates coaxially relative to the liner 20; or the adjustment plate 30 is fixed relative to the shell 10, and the liner 20 rotates coaxially relative to the adjustment plate 30. Such a design can more accurately adjust the size of the first communication area between the air outlet 31 and the air flow channel 21 under the rotation of the liner 20 or the adjustment plate 30, and can more accurately adjust the size of the second communication area between the gas outlet 32 ​​and the gas flow channel 22, so as to achieve proportional flow adjustment of air and gas under large load and small load conditions, and effectively widen the heat load adjustment ratio of the premixer 100.

[0084] In addition, the combined design of the outer shell 10 and the inner liner 20 not only facilitates the control of the profile and flow area of ​​the air flow channel 21, but also simultaneously forms a gas pressure-stabilizing cavity. Combined with the negative pressure provided by the downstream fan, the mixing ratio of gas and air can be accurately controlled, thereby greatly improving the consistency of the excess air coefficient of the premixed air.

[0085] See also Figure 8 , Fig. 9 In one embodiment of the present invention, the size of the first connected area is positively correlated with the size of the second connected area.

[0086] In this embodiment, the size of the first communication area is positively correlated with the size of the second communication area. It can be understood that when the first communication area between the air outlet 31 and the air flow channel 21 increases, the second communication area between the gas outlet 32 ​​and the gas flow channel 22 also increases; when the first communication area between the air outlet 31 and the air flow channel 21 decreases, the second communication area between the gas outlet 32 ​​and the gas flow channel 22 also decreases. The change in the size of the first communication area and the change in the size of the second communication area can be linearly related or nonlinearly related.

[0087] Such an arrangement can make the mixing ratio of air flow and gas flow effectively meet the combustion requirements of the burner to achieve a better combustion effect.

[0088] Furthermore, the first connecting area is greater than the second connecting area. It can be understood that during the coaxial rotation of one of the liner 20 and the adjustment plate 30 relative to the other, the first connecting area between the air inlet 11 and the air flow channel 21 is greater than the second connecting area between the gas outlet 32 ​​and the gas flow channel 22.

[0089] Such an arrangement can make the amount of air flowing out of the air outlet 31 greater than the amount of gas flowing out of the gas outlet 32, so as to meet the air to gas ratio required by the gas equipment, thereby reducing the amount of gas used while meeting the combustion requirements.

[0090] In practical applications, the cross-sections of the air flow channel 21 and the gas flow channel 22 may be shaped in a shape according to actual conditions, such as circular, sector-shaped, square, strip, trapezoidal, semi-circular, or other shapes. The cross-sections of the air outlet 31 and the gas outlet 32 ​​may be shaped in a shape according to actual conditions, such as circular, sector-shaped, square, strip, trapezoidal, semi-circular, or other shapes.

[0091] As an example, at least one of the cross-section of the air flow channel 21 and the cross-section of the air outlet 31 is semi-annular; at least one of the cross-section of the gas flow channel 22 and the cross-section of the gas outlet 32 ​​is semi-annular.

[0092] In this embodiment, at least one of the cross-section of the air flow channel 21 and the cross-section of the air outlet 31 is semi-circular. It can be understood that when the cross-section of the air flow channel 21 is semi-circular, the cross-section of the air outlet 31 can also be semi-circular, or circular, sector-shaped, square, strip, trapezoidal or some other shapes; when the cross-section of the air outlet 31 is semi-circular, the cross-section of the air flow channel 21 can be circular, sector-shaped, square, strip, trapezoidal or some other shapes. At least one of the cross-section of the gas flow channel 22 and the cross-section of the gas outlet 32 ​​is semi-circular. It can be understood that when the cross-section of the gas flow channel 22 is semi-circular, the cross-section of the gas outlet 32 ​​can also be semi-circular, or circular, sector-shaped, square, strip, trapezoidal or some other shapes; when the cross-section of the gas outlet 32 ​​is semi-circular, the cross-section of the gas flow channel 22 can be circular, sector-shaped, square, strip, trapezoidal or some other shapes.

[0093] With such arrangement, during the process in which one of the liner 20 and the adjustment plate 30 can coaxially rotate relative to the other, the air flow channel 21 and the air outlet 31 are always kept connected, and the gas flow channel 22 and the gas outlet 32 ​​are also always kept connected without interruption, thereby ensuring the continuous operation of the downstream burner.

[0094] Furthermore, the air flow channel 21 includes a large-load air flow channel 211 and a small-load air flow channel 212 distributed at intervals along the circumference of the liner 20, and the cross-section of the air outlet 31 is semi-annular; the gas flow channel 22 includes a large-load gas flow channel 221 and a small-load gas flow channel 222 distributed at intervals along the circumference of the liner 20, and the cross-section of the gas outlet 32 ​​is semi-annular.

[0095] In this embodiment, the air flow channel 21 includes a large-load air flow channel 211 and a small-load air flow channel 212 that are spaced apart along the circumference of the liner 20. It is understandable that the area of ​​the large-load air flow channel 211 is larger than the area of ​​the small-load air flow channel 212, so that the amount of air flowing through the large-load air flow channel 211 is larger than the amount of air flowing through the small-load air flow channel 212. The gas flow channel 22 includes a large-load gas flow channel 221 and a small-load gas flow channel 222 that are spaced apart along the circumference of the liner 20. It is understandable that the area of ​​the large-load gas flow channel 221 is larger than the area of ​​the small-load gas flow channel 222, so that the amount of gas flowing through the large-load gas flow channel 221 is larger than the amount of gas flowing through the small-load gas flow channel 222.

[0096] In such a configuration, during the process that one of the liner 20 and the adjustment plate 30 can coaxially rotate relative to the other, under a light load state, the air outlet 31 is only connected to the light load air flow channel 212, and the gas outlet 32 ​​is also only connected to the light load gas flow channel 222. In conjunction with the negative pressure generated by the fan downstream of the premixer 100, the input power of the premixer 100 under a light load state can be adjusted within a preset range, and the proportional flow rate of air and gas under a light load state can be adjusted to meet the air and gas ratio requirements under a light load state; under a heavy load state, the air outlet 31 is simultaneously connected to the heavy load air flow channel 211 and the light load air flow channel 212, and the gas outlet 32 ​​is also simultaneously connected to the heavy load gas flow channel 221 and the light load gas flow channel 222. Under the same fan speed condition, due to the significant increase in the area of ​​the air flow channel 21 and the gas flow channel 22, the input power of the premixer 100 is also significantly increased, and the proportional flow rate of air and gas under a heavy load state can be adjusted to meet the air and gas ratio requirements under a heavy load state.

[0097] Furthermore, the circumferential angles of the heavy-load air flow channel 211 and the heavy-load gas flow channel 221 are the same. With such an arrangement, the proportional flow of air and gas can be adjusted more accurately under heavy-load conditions.

[0098] Furthermore, the light-load air flow passage 212 and the light-load gas flow passage 222 are spaced apart and distributed along the radial direction of the liner 20. With such an arrangement, the proportional flow of air and gas can be more accurately adjusted under a light-load state.

[0099] Furthermore, the high-load fuel gas flow channel 221 includes at least two fuel gas sub-flow channels spaced apart from each other along the circumference of the liner 20 .

[0100] With such arrangement, during the process of switching from a high-load state to a low-load state, the gas outlet 32 ​​can first be connected with all the gas sub-flow channels and the low-load gas flow channel 222, and then the number of connections with the gas sub-flow channels is gradually reduced until the gas outlet 32 ​​is only connected with the low-load gas flow channel 222 to switch to the low-load state. During this process, the connection area between the gas outlet 32 ​​and the gas flow channel 22 can be gradually reduced, and the proportional flow of air and gas can be adjusted more accurately.

[0101] In practical applications, the cross-sectional size of the gas sub-flow channel may be the same as or different from the cross-sectional size of the small-load gas flow channel 222 , as long as the total cross-sectional size of at least two gas sub-flow channels is greater than the cross-sectional size of the small-load gas flow channel 222 .

[0102] Furthermore, at least two groups of the heavy-load air flow channels 211 and the light-load air flow channels 212 are provided, and the at least two groups of heavy-load air flow channels 211 and the at least two groups of light-load air flow channels 212 are distributed in a circular array along the central axis of the liner 20 .

[0103] In this embodiment, at least two groups of high-load air flow channels 211 and at least two groups of low-load air flow channels 212 are distributed in a circular array along the central axis of the liner 20. It can be understood that at least two groups of high-load air flow channels 211 and at least two groups of low-load air flow channels 212 are staggered along the circumference of the liner 20.

[0104] With such arrangement, at least two groups of heavy-load air flow channels 211 and at least two groups of light-load air flow channels 212 can be distributed at intervals in the circumferential direction of the liner 20, which can meet the air demand while ensuring the strength of the liner 20 itself and avoid concentrating the heavy-load air flow channels 211 and the light-load air flow channels 212 on one side of the liner 20, which would result in the risk of deformation of the liner 20.

[0105] Similarly, at least two groups of high-load gas flow channels 221 and low-load gas flow channels 222 are provided, and the at least two groups of high-load gas flow channels 221 and at least two groups of low-load gas flow channels 222 are distributed in a ring array along the central axis of the liner 20 .

[0106] In this embodiment, at least two groups of high-load gas flow channels 221 and at least two groups of low-load gas flow channels 222 are distributed in a circular array along the central axis of the liner 20. It can be understood that at least two groups of high-load gas flow channels 221 and at least two groups of low-load gas flow channels 222 are staggered along the circumference of the liner 20.

[0107] With such arrangement, at least two groups of heavy-load gas flow channels 221 and at least two groups of light-load gas flow channels 222 can be distributed at intervals in the circumferential direction of the liner 20, which can meet the gas demand while ensuring the strength of the liner 20 itself, and avoid concentrating the heavy-load gas flow channels 221 and the light-load gas flow channels 222 on one side of the liner 20, which would result in the risk of deformation of the liner 20.

[0108] In one embodiment, two groups of large-load air flow passages 211 and small-load air flow passages 212 are provided, and two groups of large-load gas flow passages 221 and small-load gas flow passages 222 are provided, and each group of large-load gas flow passages 221 includes two gas sub-flow passages, so that the liner 20 can be provided with four air flow passages 21 and six gas flow passages 22. Of course, in other embodiments, two air flow passages 21 can also be provided, and the gas flow passages 22 are designed as two semi-annular gaps, and the first connection area and the second connection area can be changed from 0 to the maximum value by adjusting the rotation angle of the liner 20 or the adjustment plate 30, thereby controlling the input power of the premixer 100 and realizing a wide range of load adjustment of the gas equipment.

[0109] Furthermore, in the radial direction of the liner 20 , the gas flow channel 22 is located at the periphery of the air flow channel 21 .

[0110] In this arrangement, since the cross-sectional area of ​​the air flow channel 21 is usually larger than the cross-sectional area of ​​the gas flow channel 22, by locating the gas flow channel 22 at the periphery of the air flow channel 21, the gas flow channel 22 with a smaller cross-sectional area can be made closer to the edge of the liner 20. On the one hand, it is easier to process and shape the gas flow channel 22 with a smaller cross-sectional area, and on the other hand, it can ensure the strength of the liner 20 and avoid deformation of the edge of the liner 20.

[0111] See also Figure 2 , Figure 7 In one embodiment of the present invention, the liner 20 is fixed to the shell 10 , and the premixer 100 further includes a driving assembly 40 drivingly connected to the adjusting plate 30 , and the driving assembly 40 drives the adjusting plate 30 to rotate relative to the liner 20 .

[0112] In this arrangement, since the overall volume of the lining 20 is larger than the overall volume of the adjustment plate 30, compared with the method of driving the lining 20 to rotate, the driving component 40 can drive the adjustment plate 30 to rotate relative to the lining 20 with a smaller driving force to achieve switching between a high load state and a low load state.

[0113] In actual application, the driving assembly 40 can be a structure in which a driving motor 41 and a transmission shaft 42 are matched, or it can be directly a rotating motor, or it can be a structure in which a driving motor 41 and a gear rack are matched, etc., as long as it can drive the adjustment plate 30 to rotate coaxially relative to the lining 20.

[0114] As an example, the drive assembly 40 includes a drive motor 41 and a transmission shaft 42; the drive motor 41 is disposed in the outer shell 10 and is provided with an output shaft 411 extending into the inner cavity; one end of the transmission shaft 42 is transmission-connected to the output shaft 411, and the other end of the transmission shaft 42 is connected to the adjustment plate 30.

[0115] In this way, the drive motor 41 can be set on the outside of the shell 10, and the output shaft 411 of the drive motor 41 can be extended into the inner cavity of the shell 10 to be connected to one end of the transmission shaft 42, and the other end of the transmission shaft 42 can be connected to the adjustment plate 30. Under the action of the drive motor 41, the output shaft 411 can drive the transmission shaft 42 to rotate, and then the transmission shaft 42 can drive the adjustment plate 30 to rotate coaxially relative to the lining 20. Such a design does not need to install the entire drive motor 41 in the inner cavity of the shell 10, which can not only reduce the difficulty of assembly, but also reduce the overall volume of the shell 10 to reduce costs.

[0116] In practical applications, the extension direction of the output shaft 411 of the driving motor 41 may be consistent with or inconsistent with the extension direction of the transmission shaft 42 .

[0117] In actual application, the transmission shaft 42 and the adjustment plate 30 can be connected by means of screws, bolts, buckles, etc., which are not specifically limited here.

[0118] Furthermore, the output shaft 411 extends in the radial direction of the liner 20 , and the transmission shaft 42 extends in the axial direction of the liner 20 , and the output shaft 411 is meshed with the transmission shaft 42 .

[0119] With such arrangement, the drive motor 41 can be installed on one side of the outer shell 10 by making the output shaft 411 extend radially along the lining 20, which makes it easier to install the drive motor 41. When the output shaft 411 of the drive motor 41 rotates, the output shaft 411 is engaged with the transmission shaft 42, and the adjustment plate 30 can be driven to rotate coaxially relative to the lining 20 through the transmission shaft 42.

[0120] In this embodiment, an output gear 4111 is disposed at the output end of the output shaft 411 , and a transmission gear 422 is disposed at one end of the transmission shaft 42 away from the adjustment plate 30 , and the transmission gear 422 is meshed with the output gear 4111 .

[0121] See also Figure 2 In one embodiment of the present invention, the liner 20 is provided with an avoidance channel 20 a extending along the central axis, and the transmission shaft 42 is passed through the avoidance channel 20 a and is spaced apart from the liner 20 .

[0122] In this way, by inserting the transmission shaft 42 into the avoidance channel 20a of the liner 20, the transmission shaft 42 can utilize the space of the liner 20 itself, so that the transmission shaft 42 does not need to occupy additional space in the inner cavity, and the overall volume of the shell 10 can be reduced to reduce costs. In addition, by making the transmission shaft 42 and the liner 20 spaced apart, the transmission shaft 42 will not interfere with the liner 20 during rotation.

[0123] For further information, see Figure 2 , Figure 7 A first sealing ring 421 is provided between the outer wall of the transmission shaft 42 and the inner wall of the avoidance channel 20a.

[0124] In this way, by providing a first sealing ring 421 between the outer wall of the transmission shaft 42 and the inner wall of the avoidance channel 20a, the gap between the transmission shaft 42 and the liner 20 can be sealed by the first sealing ring 421 to prevent external air from flowing from the gap to the air outlet 31 of the adjustment plate 30 and affecting the precise control of the air flow.

[0125] Furthermore, the front section 23 of the liner cooperates with the rear section 24 of the liner to form an avoidance groove 20 b communicating with the avoidance channel 20 a , and one end of the output shaft 411 extends into the avoidance groove 20 b to engage with the transmission shaft 42 .

[0126] In this way, by making the front section 23 of the lining cooperate with the rear section 24 of the lining to form an avoidance groove 20b connected to the avoidance channel 20a, during the assembly process, the transmission shaft 42 can be first passed through the avoidance channel 20a of the rear section 24 of the lining, and the end of the transmission shaft 42 provided with the transmission gear 422 is extended into the avoidance groove 20b, and then the end of the output shaft 411 provided with the output gear 4111 is extended into the avoidance groove 20b, so that the output gear 4111 is meshed with the transmission gear 422, and then the front section 23 of the lining is cooperated with the rear section 24 of the lining, which makes it easier to assemble the structure.

[0127] In actual application, an avoidance groove 20b can be formed on the end surface of the lining rear section 24 close to the lining front section 23; or, an avoidance groove 20b can be formed on the end surface of the lining front section 23 close to the lining rear section 24; or, a front section groove can be formed on the end surface of the lining rear section 24 close to the lining front section 23, and a rear section groove can be formed on the end surface of the lining front section 23 close to the lining rear section 24, and the front section groove and the rear section groove can constitute the avoidance groove 20b.

[0128] See also Figure 5 , Figure 6 In one embodiment of the present invention, one of the liner 20 and the adjustment plate 30 is provided with a limiting groove 25, and the other is provided with a limiting column 33, and the limiting column 33 cooperates with the limiting groove 25 to limit the relative rotation angle of the liner 20 and the adjustment plate 30.

[0129] With such arrangement, during the coaxial rotation of one of the lining 20 and the adjustment plate 30 relative to the other, the relative rotation angle of the lining 20 and the adjustment plate 30 can be limited with the cooperation of the limiting column 33 and the limiting groove 25, thereby effectively preventing the lining 20 or the adjustment plate 30 from rotating to a wrong position, thereby improving the accuracy of the control of the drive motor 41.

[0130] In one embodiment, a limiting groove 25 may be provided on a side of the liner 20 close to the adjustment plate 30 , and a limiting column 33 may be provided on a side of the adjustment plate 30 close to the liner 20 .

[0131] In another embodiment, a limiting column 33 may be provided on a side of the liner 20 close to the adjustment plate 30 , and a limiting groove 25 may be provided on a side of the adjustment plate 30 close to the liner 20 .

[0132] The present invention further proposes a gas device, which includes a premixer 100. The specific structure of the premixer 100 refers to the above embodiment. Since the gas device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0133] In this embodiment, the gas equipment may be a gas water heater, a wall-mounted boiler, a gas stove, etc. The gas equipment may also include a burner and a fan. After the air and gas flowing out of the air outlet 31 and the gas outlet 32 ​​of the premixer 100 are mixed into premixed air, the premixed air enters the burner under the action of the fan and flows out of the burner through the burner's fire hole to achieve ignition and combustion. Among them, under the regulation of the premixer 100, the load regulation range of the gas equipment can be increased, so that users have a better experience in heating.

[0134] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A premixer, It is characterized in that include: A shell having an inner cavity and an air inlet and a gas inlet communicating with the inner cavity; An inner liner is arranged in the inner cavity and is provided with an air flow channel communicating with the air inlet and a gas flow channel communicating with the gas inlet, a gas retention cavity is formed between the outer side of the inner liner and the cavity wall of the inner cavity, and the gas inlet is connected to the gas flow channel through the gas retention cavity; An adjusting plate is arranged in the inner cavity and is provided with the air outlet connected to the air flow channel and the gas outlet connected to the gas flow channel; the adjusting plate cooperates with the liner to adjust the size of a first connecting area between the air outlet and the air flow channel, and the size of a second connecting area between the gas outlet and the gas flow channel.

2. The premixer according to claim 1, It is characterized in that The gas storage cavity is extended along the circumferential direction of the liner, and the gas inlet is arranged on the peripheral side wall of the inner cavity.

3. The premixer according to claim 2, It is characterized in that The liner includes a front liner section and a rear liner section distributed along the axial direction, and the adjustment plate is arranged on a side of the rear liner section away from the front liner section; the outer side of the rear liner section and the cavity wall of the inner cavity form the gas retention cavity.

4. The premixer according to claim 3, It is characterized in that The rear section of the lining comprises: Two discs are spaced apart along the axial direction of the shell, and one of the discs is disposed close to the front section of the liner; A connecting part connects the two disk bodies, the size of the connecting part is smaller than the size of the disk bodies, and the outer side of the connecting part and the cavity wall of the inner cavity form the gas retention cavity.

5. The premixer according to claim 4, It is characterized in that The disc body away from the front section of the liner is provided with the gas flow channel.

6. The premixer according to claim 5, It is characterized in that The width of the gas cavity gradually increases from a side away from the gas flow channel to a side close to the gas flow channel.

7. The premixer according to claim 4, It is characterized in that A first sealing member and a second sealing member are respectively arranged between the outer sides of the two disk bodies and the cavity wall of the inner cavity. The first sealing member and the second sealing member are respectively arranged on both sides of the gas cavity.

8. The premixer according to claim 7, It is characterized in that A first limiting groove is provided on the cavity wall of the inner cavity and / or on the outer side of one of the disc bodies, and the first sealing member is clamped in the first limiting groove; And / or, a second limiting groove is provided on the cavity wall of the inner cavity and / or the outer side of the other disk body, and the second sealing member is clamped in the second limiting groove.

9. The premixer according to claim 3, It is characterized in that The front section of the liner is provided with a front section flow channel, and the rear section of the liner is provided with a rear section flow channel. The front section flow channel and the rear section flow channel are connected to form the air flow channel, and the cross-sectional area of ​​the front section flow channel is greater than the cross-sectional area of ​​the rear section flow channel.

10. The premixer according to claim 9, It is characterized in that In the direction from the front section of the liner to the rear section of the liner, the cross-sectional area of ​​the front section flow channel gradually decreases; And / or, in the direction from the front section of the liner to the rear section of the liner, the cross-sectional area of ​​the rear section flow channel gradually decreases.

11. A premixer according to any one of claims 1 to 10, It is characterized in that The adjustment plate is coaxially arranged with the liner, and one of the liner and the adjustment plate can rotate coaxially relative to the other, so as to adjust the size of the first communication area between the air outlet and the air flow channel, and the size of the second communication area between the gas outlet and the gas flow channel.

12. The premixer according to claim 11, It is characterized in that The size of the first connected area is positively correlated with the size of the second connected area.

13. The premixer according to claim 11, It is characterized in that The liner is fixed to the shell, and the premixer further comprises a driving assembly which is transmission-connected to the adjustment plate, and the driving assembly drives the adjustment plate to rotate relative to the liner.

14. The premixer according to claim 11, It is characterized in that One of the liner and the adjustment plate is provided with a limiting groove, and the other is provided with a limiting column, and the limiting column cooperates with the limiting groove to limit the relative rotation angle of the liner and the adjustment plate.

15. A gas-fired device, It is characterized in that Comprising a premixer as claimed in any one of claims 1 to 14.

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