Premixer and fuel gas equipment

Abstract

The utility model discloses a premixer and fuel gas equipment, and relates to the technical field of fuel gas heat supply, the premixer comprises a shell, a lining, a clamping piece and an adjusting plate; the shell is provided with an inner cavity, an air inlet and a gas inlet, wherein the air inlet and the gas inlet communicate with the inner cavity. The cavity wall of the inner cavity is provided with limiting protrusions. 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, and one shaft end face of the lining abuts against the limiting protrusion; the clamping piece abuts against the shaft end face, away from the limiting protrusion, of the lining so as to axially position the lining. 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 scheme, the fixing effect of the lining in the shell can be improved, so that the lining is prevented from shaking in the shell.

Description

Technical Field

[0001] The utility model relates to the technical field of gas heating, and particularly relates to a premixer and a gas device. Background Art

[0002] Gas devices such as gas water heaters, wall-hung boilers, gas stoves, etc. are generally divided into diffusion combustion, partial premixed combustion and full premixed combustion. Among them, full premixed combustion means that air and gas are pre-mixed in a certain proportion to form premixed air, and then the premixed air is ignited and burned in a burner.

[0003] With the gradual improvement of people's requirements for the heating quality of gas devices, it is required that gas water heaters have more precise power control. Therefore, gas devices need to have a large wide-band power adjustment to meet the needs of users for different powers. Among them, the premixer is an important component in a full premixed gas device for adjusting the stability of the gas-air equivalence ratio and affecting the load adjustment ratio, and its structure and performance directly affect the load adjustment range of the gas device.

[0004] The premixer in the related technology includes a housing and a lining arranged in the housing, and the lining is prone to shaking in the housing. Summary of the Utility Model

[0005] The main object of the utility model is to propose a premixer and a gas device, aiming to improve the fixing effect of the lining in the housing to prevent the lining from shaking in the housing.

[0006] To achieve the above object, a premixer proposed by the utility model includes:

[0007] A housing, provided with an inner cavity, an air inlet and a gas inlet communicating with the inner cavity, and a limiting protrusion is arranged on the cavity wall of the inner cavity;

[0008] A lining, arranged in the inner cavity, and provided with an air flow channel communicating with the air inlet and a gas flow channel communicating with the gas inlet, and one axial end face of the lining abuts against the limiting protrusion;

[0009] A clamping member, abuts against the axial end face of the lining far away from the limiting protrusion to axially position the lining;

[0010] An adjusting plate, arranged in the inner cavity, and provided with an air outlet communicating with the air flow channel and a gas outlet communicating with the gas flow channel; the adjusting plate cooperates with the lining 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.

[0011] In an embodiment of the present application, the clamping member is a clamp.

[0012] In one embodiment of the present application, a cavity wall of the inner cavity is further provided with a limiting groove, and the clamp part is clamped in the limiting groove.

[0013] In one embodiment of the present application, the limiting protrusion is extended along the circumference of the liner.

[0014] In one embodiment of the present application, the adjustment plate is located on the peripheral wall surface of the limiting protrusion and is gap-matched with the limiting protrusion.

[0015] 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.

[0016] 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.

[0017] In one embodiment of the present application, the first connected area is greater than the second connected area.

[0018] 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.

[0019] In one embodiment of the present application, a gas cavity is formed between the outer side of the liner and the cavity wall of the inner cavity, and the gas inlet is connected to the gas channel through the gas cavity.

[0020] 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.

[0021] In one embodiment of the present application, a first seal and a second seal spaced apart in the axial direction are provided on the outer side of the liner, and the first seal and the second seal are respectively provided on both sides of the gas cavity.

[0022] In one embodiment of the present application, a first limiting groove is provided on the cavity wall of the inner cavity and / or the outer side of the inner liner, and the first sealing member is clamped in the first limiting groove;

[0023] And / or, a second limiting groove is provided on the cavity wall of the inner cavity and / or the outer side of the lining, and the second sealing member is clamped in the second limiting groove.

[0024] To achieve the above object, the utility model also provides a gas device, including the premixer as described above.

[0025] The technical solution of the present utility model can precisely adjust the size of the first communication area between the air outlet and the air flow channel by providing a mutually cooperating inner lining and adjusting plate in the inner cavity of the outer shell. At the same time, it can accurately adjust the size of the second communication area between the gas outlet and the gas flow channel, enabling the switching between the large-load state and the small-load state, so as to realize the proportional flow regulation of air and gas in the large-load state and the small-load state, effectively broadening the heat load adjustment ratio of the premixer, achieving a wide range of load adjustment for gas equipment, and making the user experience of heating better.

[0026] In addition, a limiting protrusion is provided on the inner cavity wall of the outer shell. During the assembly process, the inner lining can be first installed into the inner cavity, and one axial end face of the inner lining is abutted against the limiting protrusion. Then, a clamping member is used to abut against the axial end face of the inner lining away from the limiting protrusion to axially position the inner lining, which can improve the fixing effect of the inner lining in the outer shell and effectively prevent the inner lining from shaking in the outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 It is a schematic structural diagram of a perspective view of an embodiment of a premixer provided by the present utility model;

[0029] Figure 2 It is a schematic structural diagram of another perspective view of an embodiment of a premixer provided by the present utility model;

[0030] Figure 3 It is a cross-sectional view of an embodiment of a premixer provided by the present utility model;

[0031] Figure 4 It is an exploded view of a perspective view of an embodiment of a premixer provided by the present utility model;

[0032] Figure 5 It is an exploded view of another perspective view of an embodiment of a premixer provided by the present utility model;

[0033] Figure 6 It is a schematic structural diagram of the outer shell in an embodiment of a premixer provided by the present utility model;

[0034] Figure 7 It is a cross-sectional view of the outer shell in an embodiment of a premixer provided by the present utility model;

[0035] Figure 8Partial structural schematic diagram of an embodiment of the premixer provided by the present utility model under high load conditions;

[0036] Figure 9 Partial structural schematic diagram of an embodiment of the premixer provided by the present utility model under low load conditions;

[0037] Figure 10 Partial structural exploded view of an embodiment of the premixer provided by the present utility model from one perspective;

[0038] Figure 11 Partial structural exploded view of an embodiment of the premixer provided by the present utility model from another perspective;

[0039] Figure 12 Partial structural schematic diagram of an embodiment of the premixer provided by the present utility model.

[0040] Explanation of the reference numerals in the attached drawings:

[0041] Label Name Label Name 100 Premixer 222 Small-load gas flow channel 10 Outer shell 23 Front section of the inner lining 11 Air inlet 24 Rear section of the inner lining 12 Gas inlet 25 Limit groove 13 Gas connector 26 Gas cavity 14 Second sealing ring 27 First seal 15 Limit protrusion 28 Second seal 16 Limit groove 30 Adjusting plate 17 First limit groove 31 Air outlet 18 Second limit groove 32 Gas outlet 20 Inner lining 33 Limit post 21 Air flow channel 40 Drive assembly 211 Large-load air flow channel 41 Drive motor 212 Small-load air flow channel 411 Output shaft 22 Gas flow channel 42 Drive shaft 221 Large-load gas flow channel 50 Snap-in part 221a Gas sub-flow channel

[0042] The realization of the object, functional characteristics and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the attached drawings. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0044] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, then such directional indications will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, 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 utility model.

[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] The premixer in the related art includes an outer shell and an inner liner disposed in the outer shell, and the inner liner is easy to shake in the outer shell.

[0049] Based on this, the utility model proposes a premixer 100, which aims to improve the fixing effect of the liner 20 in the shell 10 to prevent the liner 20 from shaking in the shell 10. 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 fire hole of the burner to achieve ignition and combustion. The structure of the premixer 100 will be described in the following by way of an embodiment.

[0050] See also Figures 1 to 7, in an embodiment of the present utility model, the premixer 100 includes a housing 10, a lining 20, a clamping member 50 and an adjusting plate 30; the housing 10 is provided with an inner cavity, an air inlet 11 and a gas inlet 12 communicating with the inner cavity, and a limiting protrusion 15 is provided on the inner wall of the inner cavity; the lining 20 is arranged in the inner cavity, and is provided with an air flow channel 21 communicating with the air inlet 11 and a gas flow channel 22 communicating with the gas inlet 12, and one axial end face of the lining 20 abuts against the limiting protrusion 15; the clamping member 50 abuts against the axial end face of the lining 20 away from the limiting protrusion 15 to axially position the lining 20; the adjusting plate 30 is arranged in the inner cavity, and is provided with an air outlet 31 communicating with the air flow channel 21 and a gas outlet 32 communicating with the gas flow channel 22; the adjusting plate 30 cooperates with the lining 20 to adjust the size of the first communication area between the air outlet 31 and the air flow channel 21, and the size of the second communication area between the gas outlet 32 and the gas flow channel 22.

[0051] In this embodiment, the housing 10 serves to support the lining 20 and the adjusting plate 30. The housing 10 is provided with an inner cavity, an air inlet 11, a gas inlet 12 and a limiting protrusion 15. It can be understood that the air entering from the air inlet 11 can flow into the air flow channel 21 of the lining 20 and then flow out from the air outlet 31 of the adjusting plate 30; the gas entering from the gas inlet 12 can flow into the gas flow channel 22 of the lining 20 and then flow out from the gas outlet 32 of the adjusting plate 30. Before that, under the cooperation of the lining 20 and the adjusting plate 30, 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 adjust the air volume and gas volume, that is, to adjust the mixing ratio of air and gas, so as to realize the heat load adjustment of the premixer 100 within a large range. Under the action of the limiting protrusion 15 and the clamping member 50, the lining 20 is axially positioned to improve the fixing effect of the lining 20 in the housing 10.

[0052] In actual application, the limiting protrusion 15 can be integrally formed on the inner wall of the inner cavity, or can be fixed on the inner wall of the inner cavity by means of bolts, bonding, etc.

[0053] In actual application, the clamping member 50 can be a buckle fixed on the inner wall of the inner cavity, or can be a clamp separated from the housing 10.

[0054] In practical applications, a gas connector 13 can be provided at the gas inlet 12 to facilitate the connection and installation of the gas inlet 12 to an external gas supply device. Optionally, in order to improve the connection tightness between the gas connector 13 and the gas inlet 12 to prevent gas leakage, a second sealing ring 14 can 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 sunk platform can be provided on the outer side wall of the housing 10 where the gas inlet 12 is located, so as to install the second sealing ring 14 on the sunk platform, so that the second sealing ring 14 is clamped between the sunk platform and the gas connector 13.

[0055] In practical applications, the air inlet 11 can be provided on the peripheral wall surface of the inner cavity of the housing 10, or can be provided on the end wall surface of the inner cavity of the housing 10. Similarly, the gas inlet 12 can be provided on the peripheral wall surface of the inner cavity of the housing 10, or can be provided on the end wall surface of the inner cavity of the housing 10.

[0056] In one embodiment, the air inlet 11 can be provided on one end wall surface of the inner cavity of the housing 10, and a mixed air outlet 31 can be provided on the other end surface of the inner cavity of the housing 10. The air and gas flowing out from the air outlet 31 and the gas outlet 32 can enter the burner through the mixed air outlet 31 after being mixed.

[0057] In practical applications, the shape and structure of the air inlet 11 can be determined according to actual situations. For example, it can be circular, fan-shaped, square, strip-shaped or some other shapes, etc. The shape and structure of the gas inlet 12 can also be determined according to actual situations. For example, it can be circular, fan-shaped, square, strip-shaped or some other shapes, etc.

[0058] In this embodiment, the inner liner 20 is a Venturi inner liner 20. That is, the fluid flowing through the Venturi inner liner 20 generates the Venturi effect. This effect is manifested as when the restricted flow passes through a reduced cross-section of the flow-through area, the fluid shows a phenomenon of increasing flow velocity, and its flow velocity is inversely proportional to the cross-section of the flow-through area. And according to Bernoulli's law, the increase in flow velocity is accompanied by a decrease in fluid pressure, that is, the common Venturi phenomenon. Generally speaking, this effect means that a low pressure will be generated near the high-speed flowing fluid, thereby generating an adsorption effect.

[0059] In summary, the technical solution of the present utility model can accurately adjust the size of the first communication area between the air outlet 31 and the air flow channel 21 by providing a mutually cooperating inner liner 20 and an adjusting plate 30 in the inner cavity of the outer shell 10. At the same time, the size of the second communication area between the gas outlet 32 and the gas flow channel 22 can be accurately adjusted, so that the switching between the large load state and the small load state can be realized, and the proportional flow regulation of air and gas under the large load state and the small load state can be achieved. The heat load regulation ratio of the premixer 100 is effectively broadened, and the large-range load regulation of the gas equipment is realized, making the user experience of heating better.

[0060] In addition, a limiting protrusion 15 is provided on the inner cavity wall of the outer shell 10. During the assembly process, the inner liner 20 can be first installed into the inner cavity, and one axial end face of the inner liner 20 is abutted against the limiting protrusion 15. Then, the clamping member 50 is used to abut against the axial end face of the inner liner 20 away from the limiting protrusion 15 to axially position the inner liner 20, thereby improving the fixing effect of the inner liner 20 in the outer shell 10 and effectively preventing the inner liner 20 from shaking in the outer shell 10.

[0061] Please refer to Figure 4 、 Figure 5 In an embodiment of the present utility model, the clamping member 50 is a clamp.

[0062] With such a setting, during the assembly process, the inner liner 20 can be first installed into the inner cavity, and one axial end face of the inner liner 20 is abutted against the limiting protrusion 15. Then, the clamp is pressed to deform, so that the clamp can be smoothly installed into the inner cavity. When the clamp abuts against the axial end face of the inner liner 20 away from the limiting protrusion 15, the clamp is released, and the clamp restores its deformation to be limited and fixed on the inner cavity wall, thereby axially positioning the inner liner 20. The method of fixing with a clamp can facilitate the disassembly and assembly of the inner liner 20 for easy maintenance of the inner liner 20.

[0063] Furthermore, please refer to Figure 4 、 Figure 5 、 Figure 7 A limiting groove 16 is also provided on the inner cavity wall, and part of the clamp is disposed in the limiting groove 16.

[0064] With such a setting, when the clamp is released during the assembly process, the clamp restores its deformation so that part of it is disposed in the limiting groove 16 to axially limit the clamp, thereby improving the positioning effect of the clamp on the inner liner 20.

[0065] Please refer to Figure 1 In an embodiment of the present utility model, the limiting protrusion 15 extends along the circumferential direction of the inner liner 20. It can be understood that the limiting protrusion 15 is in a ring shape design.

[0066] With such a setting, when the inner liner 20 is installed in the inner cavity, the peripheral edge of the inner liner 20 can abut against the annular limiting protrusion 15, which can increase the limiting area of the limiting protrusion 15 on the inner liner 20 to improve the positioning effect of the inner liner 20.

[0067] Please refer to Figure 1 , in an embodiment of the present invention, the adjusting plate 30 is located on the peripheral wall surface of the limiting protrusion 15 and is in clearance fit with the limiting protrusion 15. It can be understood that the limiting protrusion 15 is designed to surround the adjusting plate 30.

[0068] With such a setting, when the adjusting plate 30 has a tendency to tilt slightly during rotation, the peripheral wall surface of the limiting protrusion 15 can limit the adjusting plate 30 to prevent the adjusting plate 30 from tilting during rotation.

[0069] Please refer to Figures 3 to 5 , in an embodiment of the present invention, the adjusting plate 30 is coaxially arranged with the inner liner 20, and one of the inner liner 20 and the adjusting plate 30 can rotate coaxially relative to the other, for adjusting the size of the first communication area between the air outlet 31 and the air flow channel 21, and the size of the second communication area between the gas outlet 32 and the gas flow channel 22.

[0070] In this embodiment, one of the inner liner 20 and the adjusting plate 30 can rotate coaxially relative to the other. It can be understood that the inner liner 20 is fixed relative to the outer shell 10, and the adjusting plate 30 rotates coaxially relative to the inner liner 20; or the adjusting plate 30 is fixed relative to the outer shell 10, and the inner liner 20 rotates coaxially relative to the adjusting plate 30. Such a design can more precisely adjust the size of the first communication area between the air outlet 31 and the air flow channel 21 under the rotation of the inner liner 20 or the adjusting plate 30, and at the same time can more accurately adjust the size of the second communication area between the gas outlet 32 and the gas flow channel 22 to realize the proportional flow regulation of air and gas under large load conditions and small load conditions, effectively broadening the heat load regulation ratio of the premixer 100.

[0071] 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 synchronously forms a gas pressure stabilizing cavity. With the negative pressure provided by the downstream fan, the precise control of the mixing ratio of gas and air can be realized, greatly improving the consistency of the excess air coefficient of the premixed air.

[0072] Please refer to Figure 8 、 Figure 9 , in an embodiment of the present invention, the size of the first communication area is positively correlated with the size of the second communication area.

[0073] 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. Among them, the change in the size of the first communication area and the change in the size of the second communication area can be a linear relationship or a non-linear relationship.

[0074] With such a setting, the mixing ratio of the air flow rate and the gas flow rate can effectively meet the combustion requirements of the burner, so as to achieve a better combustion effect.

[0075] Furthermore, please refer to Figure 8 , Figure 9 that the first communication area is larger than the second communication area.

[0076] In this embodiment, the first communication area is larger than the second communication area. It can be understood that during the process of one of the inner lining 20 and the adjusting plate 30 rotating coaxially relative to the other, the first communication area between the air inlet 11 and the air flow channel 21 is larger than the second communication area between the gas outlet 32 and the gas flow channel 22.

[0077] With such a setting, the amount of air flowing out of the air outlet 31 can be made larger than the amount of gas flowing out of the gas outlet 32, so as to meet the ratio of air to gas required by the gas equipment, and on the basis of meeting the combustion requirements, reduce the gas consumption.

[0078] In practical applications, the shape structures of the cross-sections of the air flow channel 21 and the gas flow channel 22 can be determined according to the actual situation. For example, they can be circular, fan-shaped, square, strip-shaped, trapezoidal, semi-circular or some other shapes, etc. The shape structures of the cross-sections of the air outlet 31 and the gas outlet 32 can be determined according to the actual situation. For example, they can also be circular, fan-shaped, square, strip-shaped, trapezoidal, semi-circular or some other shapes, etc.

[0079] 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-circular; 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.

[0080] 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, fan-shaped, square, strip-shaped, trapezoidal or some other shapes, etc.; when the cross-section of the air outlet 31 is semi-circular, the cross-section of the air flow channel 21 can be circular, fan-shaped, square, strip-shaped, trapezoidal or some other shapes, etc. 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, fan-shaped, square, strip-shaped, trapezoidal or some other shapes, etc.; when the cross-section of the gas outlet 32 is semi-circular, the cross-section of the gas flow channel 22 can be circular, fan-shaped, square, strip-shaped, trapezoidal or some other shapes, etc.

[0081] With such a setting, during the process that one of the inner liner 20 and the regulating plate 30 rotates coaxially relative to the other, the air flow channel 21 and the air outlet 31 always remain connected, and the gas flow channel 22 and the gas outlet 32 also always remain connected, without interruption, which can ensure the continuous operation of the downstream burner.

[0082] Further, the air flow channel 21 includes a large-load air flow channel 211 and a small-load air flow channel 212 that are circumferentially spaced apart along the inner liner 20, and the cross-section of the air outlet 31 is semi-circular; the gas flow channel 22 includes a large-load gas flow channel 221 and a small-load gas flow channel 222 that are circumferentially spaced apart along the inner liner 20, and the cross-section of the gas outlet 32 is semi-circular.

[0083] 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 circumferentially spaced apart along the inner liner 20. It can be understood 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 greater 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 circumferentially spaced apart along the inner liner 20. It can be understood 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 greater than the amount of gas flowing through the small-load gas flow channel 222.

[0084] With such a setting, during the process where one of the inner liner 20 and the adjusting plate 30 rotates coaxially relative to the other, in the low-load state, the air outlet 31 is only in communication with the low-load air flow passage 212, and at the same time, the gas outlet 32 is also only in communication with the low-load gas flow passage 222. In cooperation with the negative pressure generated by the fan downstream of the premixer 100, the input power of the premixer 100 in the low-load state can be adjusted within a preset range, and the proportional flow rate of air and gas in the low-load state can be adjusted to meet the proportional requirements of air and gas in the low-load state; in the high-load state, the air outlet 31 is in communication with both the high-load air flow passage 211 and the low-load air flow passage 212, and at the same time, the gas outlet 32 is also in communication with both the high-load gas flow passage 221 and the low-load gas flow passage 222. Under the condition of the same fan rotation speed, since the areas of the air flow passage 21 and the gas flow passage 22 increase significantly, the input power of the premixer 100 also increases significantly, and the proportional flow rate of air and gas in the high-load state can be adjusted to meet the proportional requirements of air and gas in the high-load state.

[0085] Furthermore, the circumferential angles of the high-load air flow passage 211 and the high-load gas flow passage 221 are the same. With such a setting, the proportional flow rate of air and gas can be adjusted more precisely in the high-load state.

[0086] Furthermore, the low-load air flow passage 212 and the low-load gas flow passage 222 are distributed at intervals along the radial direction of the inner liner 20. With such a setting, the proportional flow rate of air and gas can be adjusted more precisely in the low-load state.

[0087] Furthermore, the high-load gas flow passage 221 includes at least two gas sub-flow passages 221a distributed at intervals along the circumferential direction of the inner liner 20.

[0088] With such a setting, during the process of switching from the high-load state to the low-load state, the gas outlet 32 can first be in communication with all the gas sub-flow passages 221a and the low-load gas flow passage 222, and then gradually reduce the number of gas sub-flow passages 221a in communication until the gas outlet 32 is only in communication with the low-load gas flow passage 222 to switch to the low-load state. During this process, the communication area between the gas outlet 32 and the gas flow passage 22 can be gradually reduced, and the proportional flow rate of air and gas can be adjusted more precisely.

[0089] In actual application, the cross-sectional size of the gas sub-flow passage 221a can be the same as or different from the cross-sectional size of the low-load gas flow passage 222, as long as it is ensured that the total cross-sectional size of at least two gas sub-flow passages 221a is larger than the cross-sectional size of the low-load gas flow passage 222.

[0090] Please refer to Figure 4 、 Figure 5 、 Figure 12, in an embodiment of the present utility model, the inner liner 20 is fixed to the outer 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 inner liner 20.

[0091] With such a setting, since the overall volume of the inner liner 20 is larger than that of the adjusting plate 30, compared with the way of driving the inner liner 20 to rotate, the driving assembly 40 can drive the adjusting plate 30 to rotate relative to the inner liner 20 with a smaller driving force, so as to realize the switching between the large-load state and the small-load state.

[0092] In actual application, the driving assembly 40 can be a structure of a driving motor 41 and a transmission shaft 42 in cooperation, can also be directly a rotary motor, or can be a structure of a driving motor 41 and a gear rack in cooperation, etc., as long as it can drive the adjusting plate 30 to rotate coaxially relative to the inner liner 20.

[0093] As an example, please refer to Figure 3 , Figure 12 , the driving assembly 40 includes a driving motor 41 and a transmission shaft 42; the driving motor 41 is arranged on 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 drivingly connected to the output shaft 411, and the other end of the transmission shaft 42 is connected to the adjusting plate 30.

[0094] With such a setting, the driving motor 41 can be arranged outside the outer shell 10, and the output shaft 411 of the driving motor 41 can be extended into the inner cavity of the outer shell 10 to be connected to one end of the transmission shaft 42, and the other end of the transmission shaft 42 is connected to the adjusting plate 30. Under the action of the driving motor 41, the transmission shaft 42 can be driven to rotate by the output shaft 411, and then the adjusting plate 30 can be driven to rotate coaxially relative to the inner liner 20 by the transmission shaft 42. With such a design, there is no need to install the whole driving motor 41 in the inner cavity of the outer shell 10, which can not only reduce the assembly difficulty, but also reduce the overall volume of the outer shell 10 to reduce the cost.

[0095] In actual application, the extending direction of the output shaft 411 of the driving motor 41 and the extending direction of the transmission shaft 42 can be the same or different.

[0096] In actual application, the connection between the transmission shaft 42 and the adjusting plate 30 can be realized by structures such as screws, bolts, and buckles, and no specific limitation is made here.

[0097] Please refer to Figure 3 , in an embodiment of the present utility model, a gas residence 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 communicated with the gas passage through the gas residence cavity 26.

[0098] With such a setting, the fuel gas first enters the fuel gas residence cavity 26 from the fuel gas inlet 12, and then enters the fuel gas flow channel 22 from the fuel gas residence cavity 26, which can make the pressure of the incoming fuel gas more stable.

[0099] In one embodiment, the inner liner 20 includes a front inner liner section 23 and a rear inner liner section 24 distributed axially. The adjusting plate 30 is located on the side of the rear inner liner section 24 away from the front inner liner section 23. Among them, the outer side of the rear inner liner section 24 forms a fuel gas residence cavity 26 with the cavity wall of the inner cavity. It can be understood that the front inner liner section 23 and the rear inner liner section 24 form an air flow channel 21, that is, the front inner liner section 23 forms a front section flow channel, and the rear inner liner section 24 forms a rear section flow channel. The front section flow channel and the rear section flow channel constitute the air flow channel 21. The cross-sectional area of the front section flow channel is larger than that of the rear section flow channel. The design of the front inner liner 20 can extend the inner liner 20 and play a role in slowing down the sudden change of the air flow channel 21, making the air flow more effective.

[0100] In actual application, the front inner liner section 23 and the rear inner liner section 24 can be connected by means of bolts, buckles, adsorption, etc.

[0101] Furthermore, the fuel gas residence cavity 26 is arranged to extend along the circumferential direction of the inner liner 20, and the fuel gas inlet 12 is arranged on the circumferential side wall of the inner cavity.

[0102] With such a setting, by arranging the fuel gas residence cavity 26 to extend along the circumferential direction of the inner liner 20, the space of the fuel gas residence cavity 26 can be effectively increased, and the pressure stability of the incoming fuel gas can be further improved.

[0103] Please refer to Figure 3 , in one embodiment of the present utility model, a first seal 27 and a second seal 28 are arranged on the outer side of the inner liner 20 at intervals axially. The first seal 27 and the second seal 28 are respectively arranged on both sides of the fuel gas residence cavity 26.

[0104] With such a setting, by respectively arranging the first seal 27 and the second seal 28 on both sides of the fuel gas residence cavity 26, the fuel gas residence cavity 26 can be sealed by the first seal 27 and the second seal 28 to prevent the fuel gas from leaking through the gap between the inner liner 20 and the inner cavity wall, and to avoid potential safety hazards and waste of resources on the wall surface.

[0105] In this embodiment, both the first seal 27 and the second seal 28 are annular sealing rings and are arranged to extend along the circumferential direction of the inner liner 20.

[0106] Furthermore, please refer to Figure 3 、 Figure 7, a first limiting groove 17 is provided on the inner wall of the inner cavity and / or the outer side of the inner liner 20, and the first seal 27 is clamped in the first limiting groove 17; and / or, a second limiting groove 18 is provided on the inner wall of the inner cavity and / or the outer side of the inner liner 20, and the second seal 28 is clamped in the second limiting groove 18.

[0107] With such a setting, by clamping the first seal 27 in the first limiting groove 17, the first seal 27 can be limited, so as to improve the installation reliability of the first seal 27. Similarly, by clamping the second seal 28 in the second limiting groove 18, the second seal 28 can be limited, so as to improve the installation reliability of the second seal 28.

[0108] Please refer to Figure 10 , Figure 11 , in an embodiment of the present utility model, one of the inner liner 20 and the adjusting plate 30 is provided with a limiting groove 25, and the other is provided with a limiting post 33, and the limiting post 33 cooperates with the limiting groove 25 to limit the relative rotation angle of the inner liner 20 and the adjusting plate 30.

[0109] With such a setting, during the coaxial rotation of one of the inner liner 20 and the adjusting plate 30 relative to the other, the relative rotation angle of the inner liner 20 and the adjusting plate 30 can be limited under the cooperation of the limiting post 33 and the limiting groove 25, effectively preventing the inner liner 20 or the adjusting plate 30 from rotating to the wrong position, and improving the accuracy of the driving motor 41 control.

[0110] In an embodiment, a limiting groove 25 can be provided on the side of the inner liner 20 close to the adjusting plate 30, and a limiting post 33 can be provided on the side of the adjusting plate 30 close to the inner liner 20.

[0111] In another embodiment, a limiting post 33 can be provided on the side of the inner liner 20 close to the adjusting plate 30, and a limiting groove 25 can be provided on the side of the adjusting plate 30 close to the inner liner 20.

[0112] The present utility model also proposes a gas equipment, which includes a premixer 100. The specific structure of the premixer 100 refers to the above embodiments. Since this gas equipment adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0113] In this embodiment, the gas appliance can be a gas water heater, a wall-mounted boiler, a gas stove, etc. The gas appliance can also include a burner and a blower. After the air and gas flowing out from 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 blower and flows out of the burner through the burner ports to achieve ignition and combustion. Among them, under the adjustment of the premixer 100, the load adjustment range of the gas appliance can be increased, making the user experience better for heating use.

[0114] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A premixer, characterized in that, include: The outer shell is provided with an inner cavity and an air inlet and a gas inlet communicated with the inner cavity, and a cavity wall of the inner cavity is provided with a limiting protrusion; 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, and an axial end surface of the inner liner abuts against the limiting protrusion; A clamping member abuts against an axial end surface of the liner away from the limiting protrusion to axially position the liner; An adjusting plate is arranged in the inner cavity and is provided with an air outlet connected to the air flow channel and a 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, characterized in that, The clamping piece is a clamp.

3. The premixer according to claim 2, characterized in that The cavity wall of the inner cavity is also provided with a limiting groove, and the clamp part is clamped in the limiting groove.

4. The premixer according to any one of claims 1 to 3, characterized in that, The limiting protrusion is extended along the circumference of the liner.

5. The premixer according to claim 4, characterized in that, The adjustment plate is located on the peripheral wall surface of the limiting protrusion and is in clearance fit with the limiting protrusion.

6. The premixer according to any one of claims 1 to 3, 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 a first communication area between the air outlet and the air flow channel, and the size of a second communication area between the gas outlet and the gas flow channel.

7. The premixer as described in claim 6, characterized in that The size of the first connected area is positively correlated with the size of the second connected area.

8. The premixer according to claim 7, characterized in that, The first communication area is greater than the second communication area.

9. The premixer according to claim 6, 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.

10. The premixer according to any one of claims 1 to 3, characterized in that, A gas retention cavity is formed between the outer side of the liner and the cavity wall of the inner cavity, and the gas inlet is connected to the gas channel through the gas retention cavity.

11. The premixer according to claim 10, 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.

12. The premixer according to claim 11, wherein A first seal and a second seal spaced apart in the axial direction are disposed on the outer side of the liner, and the first seal and the second seal are disposed on both sides of the gas chamber.

13. The premixer according to claim 12, wherein A first limiting groove is provided on the cavity wall of the inner cavity and / or the outer side of the inner liner, 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 lining, and the second sealing member is clamped in the second limiting groove.

14. A gas equipment, characterized in that, Comprising a premixer as claimed in any one of claims 1 to 13.

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