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 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 utility model, the stability of gas pressure can be ensured during gas supply.

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 Technique

[0002] Gas devices 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 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 the 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-frequency power adjustment to meet the needs of users for different powers. Among them, the premixer is an important component in full premixed gas devices for regulating 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 gas devices.

[0004] The premixer in the related technology cannot ensure the stability of gas pressure when supplying gas. Summary of the Utility Model

[0005] The main purpose of the utility model is to propose a premixer and a gas device, aiming to ensure the stability of gas pressure when supplying gas.

[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;

[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. A gas residence cavity is formed between the outer side of the lining and the cavity wall of the inner cavity, and the gas inlet communicates with the gas flow channel through the gas residence cavity;

[0009] A regulating 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 regulating 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.

[0010] In an embodiment of the present application, the gas residence cavity extends along the circumferential direction of the lining, and the gas inlet is arranged on the circumferential side wall of the inner cavity.

[0011] In one embodiment of the present application, the inner liner includes a front section and a rear section of the inner liner distributed axially, and the adjusting plate is disposed on a side of the rear section of the inner liner away from the front section of the inner liner; a gas residence cavity is formed between an outer side of the rear section of the inner liner and a cavity wall of the inner cavity.

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

[0013] Two disk bodies spaced apart axially along the outer shell, with one of the disk bodies disposed close to the front section of the inner liner;

[0014] A connecting portion connecting the two disk bodies, the size of the connecting portion being smaller than the size of the disk bodies, and a gas residence cavity is formed between an outer side of the connecting portion and a cavity wall of the inner cavity.

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

[0016] In one embodiment of the present application, the width of the gas residence 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 disposed between outer sides of the two disk bodies and a cavity wall of the inner cavity, and the first seal and the second seal are respectively disposed on two sides of the gas residence cavity.

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

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

[0020] In one embodiment of the present application, the front section of the inner liner is provided with a front section flow channel, and the rear section of the inner 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 larger than the cross-sectional area of the rear section flow channel.

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

[0022] and / or, in a direction from the front section of the inner liner to the rear section of the inner 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 utility model also provides a gas device, including the premixer as described above.

[0028] The technical solution of the utility model 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 matching lining and an adjustment plate 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 widening 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 use.

[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 utility model 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 utility model. 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 utility model;

[0032] Figure 2 Cross-sectional view of an embodiment of the premixer provided by the present utility model;

[0033] Figure 3 Exploded view of an embodiment of the premixer provided by the present utility model from one perspective;

[0034] Figure 4 Exploded view of an embodiment of the premixer provided by the present utility model from another perspective;

[0035] Figure 5 Partial exploded view of an embodiment of the premixer provided by the present utility model from one perspective;

[0036] Figure 6 Partial exploded view of an embodiment of the premixer provided by the present utility model from another perspective;

[0037] Figure 7 Partial structural schematic diagram of an embodiment of the premixer provided by the present utility model;

[0038] Figure 8 Partial structural schematic diagram of an embodiment of the premixer provided by the present utility model under high load condition;

[0039] Figure 9 Partial structural schematic diagram of an embodiment of the premixer provided by the present utility model under low load condition.

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

[0041]

[0042]

[0043] The realization of the object, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the attached drawings. Specific embodiments

[0044] 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope protected by the present utility model.

[0045] 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, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0047] Gas appliances such as gas water heaters, wall-mounted boilers, and gas stoves are usually divided into diffusion combustion, partial premixed combustion, and fully premixed combustion. Among them, fully premixed combustion refers to the process in which air and gas are pre-mixed in a certain proportion to form pre-mixed air, and then the pre-mixed air is ignited and burned in the burner.

[0048] With the gradual improvement of people's requirements for the heating quality of gas appliances, it is required that gas water heaters have more refined power control. Therefore, gas appliances 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 fully premixed gas appliances that regulates the stability of the gas-air equivalence ratio and affects the load regulation ratio, and its structure and performance directly affect the load regulation range of gas appliances.

[0049] When the premixer in the related art supplies gas, since the cross-sectional area of the gas flow channel is small, it is impossible to ensure the stability of the gas pressure when directly entering the gas flow channel from the gas inlet.

[0050] Based on this, the present utility model proposes a premixer 100, aiming to ensure the stable gas pressure when supplying gas. The premixer 100 can be applied to gas appliances such as gas water heaters, wall-mounted boilers, gas stoves, etc. The gas appliance may further 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 fire holes of the burner to achieve ignition and combustion. The structure of the present premixer 100 will be described below by way of embodiments.

[0051] Please refer to Figures 1 to 4 , in an embodiment of the present utility model, the premixer 100 includes a housing 10, a lining 20, 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; the lining 20 is disposed in the inner cavity and is provided with an air flow passage 21 communicating with the air inlet 11 and a gas flow passage 22 communicating with the gas inlet 12. A gas retention cavity 26 is formed between the outer side of the lining 20 and the cavity wall of the inner cavity, and the gas inlet 12 communicates with the gas flow passage 22 through the gas retention cavity 26; the adjusting plate 30 is disposed in the inner cavity and is provided with an air outlet 31 communicating with the air flow passage 21 and a gas outlet 32 communicating with the gas flow passage 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 passage 21, and the size of the second communication area between the gas outlet 32 and the gas flow passage 22.

[0052] 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, and a gas inlet 12. It can be understood that the air entering from the air inlet 11 can flow to the air flow passage 21 of the lining 20, where it will successively flow through the front section flow passage 21a and the rear section flow passage 21b of the air flow passage 21, and then flow out from the air outlet 31 of the adjusting plate 30; the gas entering from the gas inlet 12 can flow to the gas flow passage 22 of the lining 20 and then flow out from the gas outlet 32 of the adjusting plate 30. Before this, 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 passage 21 can be adjusted, and the size of the second communication area between the gas outlet 32 and the gas flow passage 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 adjustment of the heat load of the premixer 100 within a large range.

[0053] In actual application, 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 counterbore can be provided on the outer side wall of the housing 10 where the gas inlet 12 is located to install the second sealing ring 14 on the counterbore so that the second sealing ring 14 is clamped between the counterbore and the gas connector 13.

[0054] In actual application, the air inlet 11 can be provided on the peripheral wall surface of the inner cavity of the housing 10 or 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 on the end wall surface of the inner cavity of the housing 10.

[0055] 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 mixed air outlet 31 can serve as an installation interface for 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.

[0056] In actual application, the shape and structure of the air inlet 11 can be determined according to actual conditions. 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 conditions. For example, it can be circular, fan-shaped, square, strip-shaped or some other shapes, etc.

[0057] 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 in that when the restricted flow passes through the reduced flow cross-section, the fluid shows a phenomenon of increasing flow velocity, and its flow velocity is inversely proportional to the flow cross-section. According to Bernoulli's law, the increase in flow velocity is accompanied by a decrease in fluid pressure, which is the common Venturi phenomenon. Generally speaking, this effect means that a low pressure will be generated near the high-speed flowing fluid, thus generating an adsorption effect.

[0058] In summary, the technical solution of the present utility model is provided with a lining 20 and an adjusting plate 30 which cooperate with each other in the inner cavity of the outer shell 10, so that the size of the first communication area between the air outlet 31 and the air flow passage 21 can be accurately adjusted, and at the same time, the size of the second communication area between the gas outlet 32 and the gas flow passage 22 can be accurately adjusted, thereby 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 regulation ratio of the premixer 100, realizing the large-range load regulation of the gas equipment, and making the user experience of heating better.

[0059] In addition, a gas residence cavity 26 is formed between the outer side of the lining 20 and the cavity wall of the inner cavity. Gas enters the gas residence cavity 26 from the gas inlet 12, is first stabilized in the gas residence cavity 26, and then enters the gas flow passage 22 from the gas residence cavity 26, so that the pressure of the incoming gas can be made more stable.

[0060] Please refer to Figure 2 , in an embodiment of the present utility model, the gas residence cavity 26 extends along the circumferential direction of the lining 20, and the gas inlet 12 is arranged on the circumferential side wall of the inner cavity.

[0061] With such a setting, by extending the gas residence cavity 26 along the circumferential direction of the lining 20, the space of the gas residence cavity 26 can be effectively increased, and the pressure stability of the incoming gas can be further improved.

[0062] Furthermore, please refer to Figures 2 to 6 , the lining 20 includes a front lining section 23 and a rear lining section 24 distributed axially. The adjusting plate 30 is arranged on the side of the rear lining section 24 away from the front lining section 23; a gas residence cavity 26 is formed between the outer side of the rear lining section 24 and the cavity wall of the inner cavity.

[0063] With such a setting, by making the lining 20 include the axially distributed front lining section 23 and the rear lining section 24, the design of the front lining section 23 can extend the axial length of the original lining 20. The air entering from the air inlet 11 can first enter the front flow passage 21a of the front lining section 23 for buffering, and then flow to the rear flow passage 21b of the rear lining section 24, so that the phenomenon of sudden change when the air flows through the air flow passage 21 of the lining 20 can be effectively slowed down, thereby making the air flow more effective.

[0064] Furthermore, please refer to Figure 5 、 Figure 6 , the rear lining section 24 includes two disk bodies 241 and a connecting portion 242; the two disk bodies 241 are distributed at intervals along the axial direction of the outer shell 10, and one of the disk bodies 241 is arranged close to the front lining section 23; 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 body 241, and a gas residence cavity 26 is formed between the outer side of the connecting portion 242 and the cavity wall of the inner cavity.

[0065] In this embodiment, by connecting two disk bodies 241 through the connecting portion 242, the two disk bodies 241 and the connecting portion 242 can form a "work" - shaped structure.

[0066] With such a setting, after the rear section 24 of the inner lining is installed into the inner cavity of the outer shell 10, the two disk bodies 241, the connecting portion 242, and the cavity wall of the inner cavity can enclose to form a gas residence cavity 26, so as to seal both sides of the gas residence cavity 26 through the two disk bodies 241.

[0067] Further, please refer to Figure 5 、 Figure 6 The disk body 241 far from the front section 23 of the inner lining is provided with a gas flow channel 22.

[0068] In this embodiment, the gas flow channel 22 is arranged on the disk body 241 far from the front section 23 of the inner lining. Both ends of the gas flow channel 22 penetrate through both sides of the disk body 241, so that one end of the gas flow channel 22 is directly communicated with the gas residence cavity 26, and the other end of the gas flow channel 22 is directly communicated with the gas outlet 32 of the regulating plate 30. After the gas enters the gas residence cavity 26 through the gas inlet 12, it directly flows from the gas flow channel 22 to the gas outlet 32 of the regulating plate 30, making the flow of the incoming gas more effective and the pressure more stable.

[0069] Further, please refer to Figure 2 The width of the gas residence cavity 26 gradually increases from the side far 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 residence cavity 26 is trapezoidal.

[0070] With such a setting, since the rear - section flow channel 21b is arranged at the position of the rear section 24 of the inner lining close to the gas residence cavity 26, and the cross - sectional area of the rear - section flow channel 21b gradually decreases from the front section 23 of the inner lining to the rear section 24 of the inner lining, by making the width of the gas residence cavity 26 gradually increase from the side far from the gas flow channel 22 to the side close to the gas flow channel 22, on the basis of the limited volume of the rear section 24 of the inner lining, the space of the gas residence cavity 26 can be effectively increased to further improve the pressure stability of the incoming gas.

[0071] Please refer to Figure 2 In an embodiment of the present utility model, a first sealing member 27 and a second sealing member 28 are respectively arranged between the outer sides of the two disk bodies 241 and the cavity wall of the inner cavity, and the first sealing member 27 and the second sealing member 28 are respectively arranged on both sides of the gas residence cavity 26.

[0072] With such a setting, by providing a first seal 27 and a second seal 28 on both sides of the gas cavity 26 respectively, the gas cavity 26 can be sealed by the first seal 27 and the second seal 28 to prevent gas leakage from the gap between the inner liner 20 and the inner cavity wall, thus avoiding potential safety hazards on the wall surface and wasting resources.

[0073] 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.

[0074] Furthermore, a first limiting groove 17 is provided on the outer side of the inner cavity wall and / or one of the disk bodies 241, and the first seal 27 is clamped in the first limiting groove 17; and / or, a second limiting groove 18 is provided on the outer side of the inner cavity wall and / or the other disk body 241, and the second seal 28 is clamped in the second limiting groove 18.

[0075] With such a setting, by clamping the first seal 27 in the first limiting groove 17, the first seal 27 can be limited, thereby improving 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, thereby improving the installation reliability of the second seal 28.

[0076] Please refer to Figure 2 , in an embodiment of the present utility model, a front-section flow channel 21a is provided in the front section 23 of the inner liner, and a rear-section flow channel 21b is provided in the rear section 24 of the inner liner. The front-section flow channel 21a and the rear-section flow channel 21b are connected and form an air flow channel 21, and the cross-sectional area of the front-section flow channel 21a is larger than that of the rear-section flow channel 21b.

[0077] With such a setting, 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 is guided by the front-section flow channel 21a to the rear-section flow channel 21b with a smaller cross-sectional area, which can improve the air circulation effect.

[0078] In actual application, the cross-sectional area of the front-section flow channel 21a in the flow path can be the same or different; similarly, the cross-sectional area of the rear-section flow channel 21b in the flow path can be the same or different.

[0079] Furthermore, in the direction from the front section 23 to the rear section 24 of the inner liner, 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.

[0080] With such a setting, the air entering from the air inlet 11 can enter the front flow channel 21a more smoothly from the end with a larger cross-sectional area for buffering, and then be guided to the rear flow channel 21b through the front flow channel 21a, which can better slow down the phenomenon of sudden change when the air flows through the air flow channel 21 of the inner liner 20, thereby being more effective for the air circulation.

[0081] Further, in the direction from the front section 23 to the rear section 24 of the inner liner, the cross-sectional area of the rear flow channel 21b gradually decreases. It can be understood that the cross-sectional area of the rear flow channel 21b gradually decreases in the air flow direction.

[0082] With such a setting, the air can enter the rear flow channel 21b more smoothly from the end with a larger cross-sectional area, which can further slow down the phenomenon of sudden change when the air flows through the air flow channel 21 of the inner liner 20, thereby being more effective for the air circulation.

[0083] Please refer to Figures 7 to 9 , in an embodiment of the present utility model, 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.

[0084] 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, under the rotation of the inner liner 20 or the adjusting plate 30, more precisely adjust the size of the first communication area between the air outlet 31 and the air flow channel 21, 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, so as 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.

[0085] 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.

[0086] Please refer to Figure 8 , Figure 9 , in an embodiment of the present utility model, the size of the first communication area is positively correlated with the size of the second communication area.

[0087] 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.

[0088] 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.

[0089] Furthermore, the first communication area is larger than the second communication area. It can be understood that during the coaxial rotation of one of the inner liner 20 and the adjustment plate 30 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] With such a setting, during the process in which one of the inner liner 20 and the adjusting plate 30 can rotate coaxially relative to the other, in a low-load state, the air outlet 31 is only communicated with the low-load air flow passage 212, and at the same time, the gas outlet 32 is also only communicated 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 demand of air and gas in the low-load state; in a high-load state, the air outlet 31 is communicated 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 communicated 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 are significantly increased, the input power of the premixer 100 is also significantly increased, and the proportional flow rate of air and gas in the high-load state can be adjusted to meet the proportional demand of air and gas in the high-load state.

[0098] Further, 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.

[0099] Further, 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.

[0100] Further, the high-load gas flow passage 221 includes at least two gas sub-flow passages distributed at intervals along the circumferential direction of the inner liner 20.

[0101] With such a setting, during the process of switching from the high-load state to the low-load state, the gas outlet 32 can be first communicated with all the gas sub-flow passages and the low-load gas flow passage 222, and then gradually reduce the number of gas sub-flow passages communicated therewith until the gas outlet 32 is only communicated 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.

[0102] In actual application, the cross-sectional size of the gas sub-flow passage 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 is larger than the cross-sectional size of the low-load gas flow passage 222.

[0103] Furthermore, there are at least two sets of large-load air channels 211 and at least two sets of small-load air channels 212. The at least two sets of large-load air channels 211 and the at least two sets of small-load air channels 212 are both arranged in a circular array along the central axis of the inner liner 20.

[0104] In this embodiment, the at least two sets of large-load air channels 211 and the at least two sets of small-load air channels 212 are both arranged in a circular array along the central axis of the inner liner 20. It can be understood that the at least two sets of large-load air channels 211 and the at least two sets of small-load air channels 212 are staggered in the circumferential direction of the inner liner 20.

[0105] With such an arrangement, the at least two sets of large-load air channels 211 and the at least two sets of small-load air channels 212 can be spaced apart in the circumferential direction of the inner liner 20. While meeting the air demand, it can ensure the strength of the inner liner 20 itself and avoid the risk of the inner liner 20 being easily deformed due to the concentrated arrangement of the large-load air channels 211 and the small-load air channels 212 on one side of the inner liner 20.

[0106] Similarly, there are at least two sets of large-load gas channels 221 and at least two sets of small-load gas channels 222. The at least two sets of large-load gas channels 221 and the at least two sets of small-load gas channels 222 are both arranged in a circular array along the central axis of the inner liner 20.

[0107] In this embodiment, the at least two sets of large-load gas channels 221 and the at least two sets of small-load gas channels 222 are both arranged in a circular array along the central axis of the inner liner 20. It can be understood that the at least two sets of large-load gas channels 221 and the at least two sets of small-load gas channels 222 are staggered in the circumferential direction of the inner liner 20.

[0108] With such an arrangement, the at least two sets of large-load gas channels 221 and the at least two sets of small-load gas channels 222 can be spaced apart in the circumferential direction of the inner liner 20. While meeting the gas demand, it can ensure the strength of the inner liner 20 itself and avoid the risk of the inner liner 20 being easily deformed due to the concentrated arrangement of the large-load gas channels 221 and the small-load gas channels 222 on one side of the inner liner 20.

[0109] 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.

[0110] 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 .

[0111] 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.

[0112] 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 which is transmission-connected to the adjusting plate 30 , and the driving assembly 40 drives the adjusting plate 30 to rotate relative to the liner 20 .

[0113] 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.

[0114] 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.

[0115] 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.

[0116] With such a setting, the drive motor 41 can be arranged outside the housing 10, and the output shaft 411 of the drive motor 41 extends into the inner cavity of the housing 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 drive 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 through the transmission shaft 42. With such a design, there is no need to install the entire drive motor 41 in the inner cavity of the housing 10, which can not only reduce the assembly difficulty, but also reduce the overall volume of the housing 10 to reduce costs.

[0117] In actual application, the extending direction of the output shaft 411 of the drive motor 41 can be the same as or different from the extending direction of the transmission shaft 42.

[0118] In actual application, the transmission shaft 42 and the adjusting plate 30 can be connected by structures such as screws, bolts, and buckles, and no specific limitation is made here.

[0119] Furthermore, the output shaft 411 extends along the radial direction of the inner liner 20, the transmission shaft 42 extends along the axial direction of the inner liner 20, and the output shaft 411 meshes with the transmission shaft 42.

[0120] With such a setting, by making the output shaft 411 extend along the radial direction of the inner liner 20, the drive motor 41 can be installed on one side of the housing 10, which is more convenient for installing the drive motor 41. When the output shaft 411 of the drive motor 41 rotates, the adjusting plate 30 can be driven to rotate coaxially relative to the inner liner 20 through the transmission shaft 42 under the meshing of the output shaft 411 and the transmission shaft 42.

[0121] In this embodiment, an output gear 4111 is provided at the output end of the output shaft 411, and a transmission gear 422 is provided at the end of the transmission shaft 42 away from the adjusting plate 30, and the transmission gear 422 meshes with the output gear 4111.

[0122] Please refer to Figure 2 , in an embodiment of the present utility model, the inner liner 20 is provided with an avoidance channel 20a extending along the central axis, and the transmission shaft 42 passes through the avoidance channel 20a and is spaced from the inner liner 20.

[0123] With such a setting, by passing the transmission shaft 42 through the avoidance channel 20a of the inner liner 20, the transmission shaft 42 can utilize the space of the inner liner 20 itself, so that the transmission shaft 42 does not need to occupy additional space in the inner cavity, which can reduce the overall volume of the housing 10 to reduce costs. In addition, by making the transmission shaft 42 spaced from the inner liner 20, the transmission shaft 42 will not interfere with the inner liner 20 during rotation.

[0124] Furthermore, please refer to 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.

[0125] With such a setting, by providing the 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 inner lining 20 can be sealed by the first sealing ring 421, preventing outside air from flowing from this gap to the air outlet 31 of the regulating plate 30 and affecting the precise control of the air flow.

[0126] Further, a front section 23 of the inner lining and a rear section 24 of the inner lining cooperate to form an avoidance groove 20b communicating with the avoidance channel 20a, and one end of the output shaft 411 extends into the avoidance groove 20b to engage with the transmission shaft 42.

[0127] With such a setting, by making the front section 23 of the inner lining and the rear section 24 of the inner lining cooperate to form the avoidance groove 20b communicating with the avoidance channel 20a, during the assembly process, the transmission shaft 42 can first be passed through the avoidance channel 20a of the rear section 24 of the inner lining, and the end of the transmission shaft 42 provided with the transmission gear 422 can be extended into the avoidance groove 20b. Then, the end of the output shaft 411 provided with the output gear 4111 is extended into the avoidance groove 20b to make the output gear 4111 engage with the transmission gear 422, and then the front section 23 of the inner lining and the rear section 24 of the inner lining are cooperated, which is more convenient for realizing the assembly of the structure.

[0128] In actual application, the avoidance groove 20b can be formed on the end face of the rear section 24 of the inner lining close to the front section 23 of the inner lining; or, the avoidance groove 20b can also be formed on the end face of the front section 23 of the inner lining close to the rear section 24 of the inner lining; or, a front section slot can be formed on the end face of the rear section 24 of the inner lining close to the front section 23 of the inner lining, and a rear section slot can be formed on the end face of the front section 23 of the inner lining close to the rear section 24 of the inner lining, and the front section slot and the rear section slot can form the avoidance groove 20b.

[0129] Please refer to Figure 5 、 Figure 6 , in an embodiment of the present utility model, one of the inner lining 20 and the regulating 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 lining 20 and the regulating plate 30.

[0130] With such a setting, during the process of one of the inner lining 20 and the regulating plate 30 rotating coaxially relative to the other, the relative rotation angle of the inner lining 20 and the regulating plate 30 can be limited under the cooperation of the limiting post 33 and the limiting groove 25, effectively preventing the inner lining 20 or the regulating plate 30 from rotating to the wrong position, and improving the accuracy of the control of the driving motor 41.

[0131] In one embodiment, a limiting groove 25 may be provided on one side of the inner lining 20 close to the adjusting plate 30, and a limiting post 33 may be provided on one side of the adjusting plate 30 close to the inner lining 20.

[0132] In another embodiment, a limiting post 33 may be provided on one side of the inner lining 20 close to the adjusting plate 30, and a limiting groove 25 may be provided on one side of the adjusting plate 30 close to the inner lining 20.

[0133] The present utility model further provides a gas appliance, which includes a premixer 100. The specific structure of the premixer 100 refers to the above embodiments. Since this gas appliance adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0134] In this embodiment, the gas appliance may be a gas water heater, a wall-mounted boiler, a gas stove, etc. The gas appliance may further 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 fire holes of the burner to achieve ignition and combustion. Among them, under the adjustment of the premixer 100, the load adjustment range of the gas appliance can be improved, so that the user has a better heating experience.

[0135] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A premixer, 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, wherein 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, 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, 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, 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, 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, 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, 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, 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, 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. The premixer according to any one of claims 1 to 10, 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, 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, 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, wherein, One of the inner lining and the adjusting plate is provided with a limiting groove, and the other is provided with a limiting post, and the limiting post is engaged with the limiting groove to limit the relative rotation angle between the inner lining and the adjusting plate.

15. A gas device, characterized in that, Comprising a premixer according to any one of claims 1 to 14.

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