Premixer and fuel gas equipment

Abstract

The utility model discloses a premixer and fuel gas equipment, and relates to the technical field of heat supply equipment, 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 comprises a lining front section and a lining rear section which are axially distributed, the lining front section is provided with a front section flow channel, the lining rear section is provided with a rear section flow channel, the front section flow channel and the rear section flow channel are communicated and form an air flow channel communicated with the air inlet, and the lining rear section is provided with a fuel gas flow channel communicated with the fuel gas inlet; the adjusting plate is 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 sudden change phenomenon generated when air flows through the air flow channel of the lining can be relieved, and air circulation is more effective.

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-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 this 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-frequency power adjustment to meet the needs of users for different powers. Among them, the premixer is an important component in a fully 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] In the related art, for the outer shell of the premixer and the inner liner arranged in the outer shell, when air flows through the air flow channel of the inner liner, a sudden change phenomenon will occur, thus affecting the air circulation. Summary of the Utility Model

[0005] The main purpose of the utility model is to propose a premixer and a gas device, aiming to slow down the sudden change phenomenon when air flows through the air flow channel of the inner liner and make the air circulation more effective.

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

[0007] An outer shell, which is provided with an inner cavity, an air inlet and a gas inlet communicated with the inner cavity;

[0008] An inner liner, which is arranged in the inner cavity and includes a front section of the inner liner and a rear section of the inner liner distributed axially. The front section of the inner liner is provided with a front section flow channel, 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 communicated with each other and form an air flow channel communicated with the air inlet, and the rear section of the inner liner is provided with a gas flow channel communicated with the gas inlet;

[0009] A regulating plate, which is arranged on one side of the rear section of the inner liner away from the front section of the inner liner, and is provided with an air outlet communicated with the air flow channel and a gas outlet communicated with the gas flow channel; the regulating plate cooperates with the inner liner 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 one embodiment of the present application, the cross-sectional area of the front section flow channel is greater than the cross-sectional area of the rear section flow channel.

[0011] In one embodiment of the present application, in the direction from the front section of the liner to the rear section of the liner, the cross-sectional area of the front section flow channel gradually decreases.

[0012] In one embodiment of the present application, in the direction from the front section of the liner to the rear section of the liner, the cross-sectional area of the rear section flow channel gradually decreases.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] In one embodiment of the present application, the driving component includes:

[0017] A driving motor is disposed in the housing and is provided with an output shaft extending into the inner cavity;

[0018] A transmission shaft has one end drivingly connected to the output shaft and the other end connected to the adjustment plate.

[0019] In one embodiment of the present application, the output shaft extends in a radial direction of the liner, the transmission shaft extends in an axial direction of the liner, and the output shaft is meshed with the transmission shaft.

[0020] In one embodiment of the present application, the inner liner is provided with an avoidance channel extending along the central axis, the transmission shaft is passed through the avoidance channel, and is spaced apart from the inner liner.

[0021] In one embodiment of the present application, the front section of the liner cooperates with the rear section of the liner to form an avoidance groove connected to the avoidance channel, and one end of the output shaft extends into the avoidance groove to engage with the transmission shaft.

[0022] In one embodiment of the present application, the avoidance groove is arranged on the end surface of the front section of the lining close to the rear section of the lining.

[0023] In one embodiment of the present application, the avoidance groove includes:

[0024] A mating groove, coaxially arranged with the avoidance channel;

[0025] An avoidance opening, communicating with the mating groove and penetrating from the mating groove to the peripheral side wall of the front section of the inner liner, and one end of the output shaft extends into the mating groove from the avoidance opening.

[0026] In an embodiment of the present application, the width of the avoidance opening gradually increases in the direction from the mating groove to the peripheral side wall of the front section of the inner liner.

[0027] In an embodiment of the present application, the front section of the inner liner is provided with a first connection hole, and the rear section of the inner liner is provided with a second connection hole. A connecting member is passed through the first connection hole and inserted into the second connection hole to fix the front section of the inner liner to the rear section of the inner liner.

[0028] To achieve the above object, the present utility model further provides a gas equipment, including the premixer as described above.

[0029] 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, and at the same time can precisely adjust the size of the second communication area between the gas outlet and the gas flow channel by providing a mutually cooperating inner liner and an adjusting plate in the inner cavity of the housing. Thus, the switching between the large load state and the small load state can be realized, so as to realize the adjustment of the proportional flow of air and gas in the large load state and the small load state, effectively broaden the heat load adjustment ratio of the premixer, realize the large-range load adjustment of the gas equipment, and make the user experience of heat supply better.

[0030] In addition, by making the inner liner include an axially distributed front section and a rear section of the inner liner, the design of the front section of the inner liner can extend the axial length of the original inner liner. The air entering from the air inlet can first enter the front flow channel of the front section of the inner liner for buffering, and then flow to the rear flow channel of the rear section of the inner liner, which can effectively slow down the phenomenon of sudden change when the air flows through the air flow channel of the inner liner, thus making the air flow more effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 It is a schematic structural diagram of an embodiment of the premixer provided by the present utility model;

[0033] Figure 2Cross-sectional view of an embodiment of the premixer provided by the present utility model;

[0034] Figure 3 Exploded view of an embodiment of the premixer provided by the present utility model from one perspective;

[0035] Figure 4 Exploded view of an embodiment of the premixer provided by the present utility model from another perspective;

[0036] Figure 5 Cross-sectional view of the inner lining in an embodiment of the premixer provided by the present utility model;

[0037] Figure 6 Exploded view of a partial structure of an embodiment of the premixer provided by the present utility model from one perspective;

[0038] Figure 7 Exploded view of a partial structure of an embodiment of the premixer provided by the present utility model from another perspective;

[0039] Figure 8 Partial structure schematic diagram of an embodiment of the premixer provided by the present utility model;

[0040] Figure 9 Partial structure schematic diagram of an embodiment of the premixer provided by the present utility model under high load conditions;

[0041] Figure 10 Partial structure schematic diagram of an embodiment of the premixer provided by the present utility model under low load conditions.

[0042] Explanation of the reference numerals in the drawings:

[0043]

[0044]

[0045] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying 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 creative efforts shall fall within the protection scope of the present utility model.

[0047] 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 position relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0048] In addition, if there are descriptions such as "first", "second", etc. involved 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 specifying the quantity of the indicated technical features. Thus, the features defined with "first", "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 solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where 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 fact that those of ordinary skill in the art can implement it. 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 protection scope required by the present utility model.

[0049] Gas appliances such as gas water heaters, wall-mounted boilers, gas stoves, etc. 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 premixed air, and then the premixed air is ignited and burned in the burner.

[0050] With the gradual improvement of people's requirements for the heating quality of gas appliances, it is required that gas water heaters have more precise power control. Therefore, gas appliances 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 fully premixed gas appliances that regulates the stability of the gas-air equivalence ratio and affects the load adjustment ratio, and its structure and performance directly affect the load adjustment range of gas appliances.

[0051] In the premixer housing and the inner liner provided in the housing in the related art, due to the short length of the inner liner, the air will have a sudden change phenomenon when flowing through the air flow channel of the inner liner, thereby affecting the air circulation.

[0052] Based on this, the present utility model proposes a premixer 100, aiming to slow down the phenomenon of sudden change when air flows through the air flow channel 21 of the inner liner 20, and is more effective for the circulation of air. The premixer 100 can be applied to gas appliances such as gas water heaters, wall-mounted boilers, and gas stoves. 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 flame holes of the burner to achieve ignition and combustion. The structure of the present premixer 100 will be described below by way of examples.

[0053] Please refer to Figures 1 to 5 , in an embodiment of the present utility model, the premixer 100 includes a housing 10, an inner liner 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 inner liner 20 is disposed in the inner cavity and includes a front inner liner section 23 and a rear inner liner section 24 distributed axially. The front inner liner section 23 is provided with a front section flow channel 21a, and the rear inner liner section 24 is provided with a rear section flow channel 21b. The front section flow channel 21a and the rear section flow channel 21b are connected and form an air flow channel 21 communicating with the air inlet 11. The rear inner liner section 24 is provided with a gas flow channel 22 communicating with the gas inlet 12; the adjusting plate 30 is disposed on a side of the rear inner liner section 24 away from the front inner liner section 23, 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 inner liner 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.

[0054] In this embodiment, the housing 10 serves to support the inner liner 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 channel 21 of the inner liner 20, where it will sequentially flow through the front section flow channel 21a and the rear section flow channel 21b of the air flow channel 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 channel 22 of the inner liner 20, and then flow out from the gas outlet 32 of the adjusting plate 30. Before this, under the cooperation of the inner liner 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 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 thermal load of the premixer 100 within a large range.

[0055] 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 and 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, and the second sealing ring 14 can be installed on the sunk platform so that the second sealing ring 14 is clamped between the sunk platform and the gas connector 13.

[0056] In actual application, 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.

[0057] 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.

[0058] In actual application, the shape and structure of the air inlet 11 can be determined according to the actual situation. 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 the actual situation. For example, it can be circular, fan-shaped, square, strip-shaped or some other shapes, etc.

[0059] 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 the 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.

[0060] In actual application, the front section 23 of the inner liner and the rear section 24 of the inner liner can be connected by means of bolts, buckles, adsorption, etc.

[0061] 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 passage 21, and at the same time can accurately adjust the size of the second communication area between the gas outlet 32 and the gas flow passage 22 by providing a mutually cooperating inner lining 20 and adjusting plate 30 in the inner cavity of the outer shell 10, so as to realize the switching between the large load state and the small load state, and 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's heating experience better.

[0062] In addition, by making the inner lining 20 include an axially distributed front section 23 and a rear section 24 of the inner lining, the design of the front section 23 of the inner lining can extend the axial length of the original inner lining 20. The air entering from the air inlet 11 can first enter the front flow passage 21a of the front section 23 of the inner lining for buffering, and then flow to the rear flow passage 21b of the rear section 24 of the inner lining, which can effectively slow down the phenomenon of sudden change when the air flows through the air flow passage 21 of the inner lining 20, thereby making the air circulation more effective.

[0063] Please refer to Figure 2 、 Figure 5 In an embodiment of the present utility model, the cross-sectional area of the front flow passage 21a is larger than the cross-sectional area of the rear flow passage 21b.

[0064] With such a setting, the air entering from the air inlet 11 can more smoothly enter the front flow passage 21a with a larger cross-sectional area for buffering, and then be guided by the front flow passage 21a to the rear flow passage 21b with a smaller cross-sectional area, which can improve the air circulation effect.

[0065] In actual application, the cross-sectional area of the front flow passage 21a can be the same or different on the flow path; similarly, the cross-sectional area of the rear flow passage 21b can be the same or different on the flow path.

[0066] Further, in the direction from the front section 23 of the inner lining to the rear section 24 of the inner lining, the cross-sectional area of the front flow passage 21a gradually decreases. It can be understood that the cross-sectional area of the front flow passage 21a gradually decreases in the air flow direction.

[0067] With such a setting, the air entering from the air inlet 11 can more smoothly enter the front flow passage 21a from the end with a larger cross-sectional area for buffering, and then be guided by the front flow passage 21a to the rear flow passage 21b, which can better slow down the phenomenon of sudden change when the air flows through the air flow passage 21 of the inner lining 20, thereby making the air circulation more effective.

[0068] 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 section flow channel 21b gradually decreases. It can be understood that the cross-sectional area of the rear section flow channel 21b gradually decreases in the air flow direction.

[0069] With such a setting, air can enter the rear section 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 air flows through the air flow channel 21 of the inner liner 20, thus being more effective for air circulation.

[0070] Please refer to Figures 6 to 10 , 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.

[0071] 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 adjustment of the proportional flow of air and gas under high load conditions and low load conditions, effectively broadening the heat load adjustment ratio of the premixer 100.

[0072] 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.

[0073] Please refer to Figure 9 、 Figure 10 , 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.

[0074] 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.

[0075] 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.

[0076] 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 adjusting 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.

[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 can rotate 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] Furthermore, 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 in which one of the inner liner 20 and the adjusting plate 30 can rotate coaxially relative to the other, in the 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 requirements of air and gas in the low-load state; in the 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 requirements of air and gas in the high-load state.

[0085] 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.

[0086] 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.

[0087] 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.

[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 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 with which it is communicated 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.

[0089] 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.

[0090] Furthermore, there are at least two sets of large-load air flow channels 211 and at least two sets of small-load air flow channels 212. The at least two sets of large-load air flow channels 211 and the at least two sets of small-load air flow channels 212 are both arranged in a circular array along the central axis of the inner liner 20.

[0091] In this embodiment, the at least two sets of large-load air flow channels 211 and the at least two sets of small-load air flow 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 flow channels 211 and the at least two sets of small-load air flow channels 212 are staggered in the circumferential direction of the inner liner 20.

[0092] With such an arrangement, the at least two sets of large-load air flow channels 211 and the at least two sets of small-load air flow channels 212 can be spaced apart in the circumferential direction of the inner liner 20. While meeting the air demand, the strength of the inner liner 20 itself can be ensured, and the risk of the inner liner 20 being easily deformed due to the concentrated arrangement of the large-load air flow channels 211 and the small-load air flow channels 212 on one side of the inner liner 20 can be avoided.

[0093] Similarly, there are at least two sets of large-load gas flow channels 221 and at least two sets of small-load gas flow channels 222. The at least two sets of large-load gas flow channels 221 and the at least two sets of small-load gas flow channels 222 are both arranged in a circular array along the central axis of the inner liner 20.

[0094] In this embodiment, the at least two sets of large-load gas flow channels 221 and the at least two sets of small-load gas flow 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 flow channels 221 and the at least two sets of small-load gas flow channels 222 are staggered in the circumferential direction of the inner liner 20.

[0095] With such an arrangement, the at least two sets of large-load gas flow channels 221 and the at least two sets of small-load gas flow channels 222 can be spaced apart in the circumferential direction of the inner liner 20. While meeting the gas demand, the strength of the inner liner 20 itself can be ensured, and the risk of the inner liner 20 being easily deformed due to the concentrated arrangement of the large-load gas flow channels 221 and the small-load gas flow channels 222 on one side of the inner liner 20 can be avoided.

[0096] 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.

[0097] 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 .

[0098] 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.

[0099] See also Figures 2 to 4 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 .

[0100] 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.

[0101] 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.

[0102] As an example, see Figure 2 , Figure 8 The driving assembly 40 includes a driving motor 41 and a transmission shaft 42; the driving motor 41 is disposed in the housing 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.

[0103] 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 lining 20 through the transmission shaft 42. Such a design does not require the entire drive motor 41 to be installed 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 the cost.

[0104] 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.

[0105] In actual application, the transmission shaft 42 and the adjusting plate 30 can be connected by structures such as screws, bolts, and buckles, which are not specifically limited herein.

[0106] Further, please refer to Figure 2 、 Figure 8 , the output shaft 411 extends along the radial direction of the inner lining 20, the transmission shaft 42 extends along the axial direction of the inner lining 20, and the output shaft 411 meshes with the transmission shaft 42.

[0107] With such a setting, by making the output shaft 411 extend along the radial direction of the inner lining 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 lining 20 through the transmission shaft 42 under the meshing of the output shaft 411 and the transmission shaft 42.

[0108] 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 one end of the transmission shaft 42 away from the adjusting plate 30, and the transmission gear 422 meshes with the output gear 4111.

[0109] Please refer to Figure 2 , in an embodiment of the present utility model, the inner lining 20 is provided with an avoidance channel 20a extending along the central axis, and the transmission shaft 42 is disposed through the avoidance channel 20a and is spaced apart from the inner lining 20.

[0110] With such a setting, by disposing the transmission shaft 42 through the avoidance channel 20a of the inner lining 20, the transmission shaft 42 can utilize the space of the inner lining 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 the cost. In addition, by making the transmission shaft 42 spaced apart from the inner lining 20, the transmission shaft 42 will not interfere with the inner lining 20 during the rotation process.

[0111] Further, please refer to Figure 2 and Figure 8 There is a first sealing ring 421 between the outer wall of the transmission shaft 42 and the inner wall of the avoidance channel 20a.

[0112] 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 liner 20 can be sealed by the first sealing ring 421, preventing outside air from flowing through this gap to the air outlet 31 of the regulating plate 30 and affecting the precise control of the air flow.

[0113] Further, please refer to Figure 2 and Figures 5 to 7 The front section 23 of the inner liner and the rear section 24 of the inner liner 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.

[0114] With such a setting, by making the front section 23 of the inner liner and the rear section 24 of the inner liner 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 liner, 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 liner and the rear section 24 of the inner liner are cooperated, which is more convenient for realizing the assembly of the structure.

[0115] In actual application, the avoidance groove 20b can be formed on the end face of the rear section 24 of the inner liner close to the front section 23 of the inner liner; or, the avoidance groove 20b can also be formed on the end face of the front section 23 of the inner liner close to the rear section 24 of the inner liner; or, a front section slot can be formed on the end face of the rear section 24 of the inner liner close to the front section 23 of the inner liner, and a rear section slot can be formed on the end face of the front section 23 of the inner liner close to the rear section 24 of the inner liner, and the front section slot and the rear section slot can form the avoidance groove 20b.

[0116] As an example, please refer to Figure 6 The avoidance groove 20b is provided on the end face of the front section 23 of the inner liner close to the rear section 24 of the inner liner.

[0117] With such a setting, since the structure of the front section 23 of the inner liner is relatively simple, during the preparation process, the avoidance groove 20b can be directly formed on the end face of the front section 23 of the inner liner close to the rear section 24 of the inner liner, which is more convenient for realizing the processing and forming of the avoidance groove 20b.

[0118] Further, the avoidance groove 20b may include a mating groove 20b1 and an avoidance opening 20b2; the mating groove 20b1 is coaxially arranged with the avoidance channel 20a; the avoidance opening 20b2 communicates with the mating groove 20b1 and penetrates from the mating groove 20b1 to the circumferential side wall of the front section 23 of the inner liner, and one end of the output shaft 411 extends into the mating groove 20b1 from the avoidance opening 20b2.

[0119] With such an arrangement, by coaxially arranging the mating groove 20b1 with the avoidance channel 20a, the transmission shaft 42 can be passed through the avoidance channel 20a so that one end of the transmission shaft 42 is inserted into the mating groove 20b1. Since the avoidance opening 20b2 penetrates from the mating groove 20b1 to the circumferential side wall of the front section 23 of the inner liner, one end of the output shaft 411 can be smoothly extended into the mating groove 20b1 from the avoidance opening 20b2, facilitating the mating installation of the output shaft 411 and the transmission shaft 42.

[0120] Further, the width of the avoidance opening 20b2 gradually increases in the direction from the mating groove 20b1 to the circumferential side wall of the front section 23 of the inner liner.

[0121] With such an arrangement, one end of the output shaft 411 can be inserted into the avoidance opening 20b2 from the side with a larger width of the avoidance opening 20b2 and smoothly extended into the mating groove 20b1 under the guidance of the avoidance opening 20b2, making it even more convenient to realize the mating installation of the output shaft 411 and the transmission shaft 42.

[0122] Please refer to Figure 2 , in an embodiment of the present utility model, a gas residence cavity 26 may be formed between the outer side of the rear section 24 of the inner liner and the cavity wall of the inner cavity, and the gas inlet 12 communicates with the gas flow channel 22 through the gas residence cavity 26.

[0123] With such an arrangement, the gas first enters the gas residence cavity 26 from the gas inlet 12 and then enters the gas flow channel 22 from the gas residence cavity 26, which can make the pressure of the inlet gas more stable.

[0124] Please refer to Figure 6 , Figure 7 , 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. The limiting post 33 cooperates with the limiting groove 25 to limit the relative rotation angle between the inner liner 20 and the adjusting plate 30.

[0125] With such an arrangement, during the coaxial rotation of one of the inner liner 20 and the adjusting plate 30 relative to the other, the relative rotation angle between 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 control of the driving motor 41.

[0126] 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.

[0127] 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.

[0128] Please refer to Figure 7 , in one embodiment of the present utility model, a first connection hole 231 is provided on the front section 23 of the inner lining, and a second connection hole 241 is provided on the rear section 24 of the inner lining. A connecting member 232 passes through the first connection hole 231 and is inserted into the second connection hole 241 to fix the front section 23 of the inner lining to the rear section 24 of the inner lining.

[0129] With such a setting, during the assembly process, the connecting member 232 can pass through the first connection hole 231 of the front section 23 of the inner lining and then be inserted into the second connection hole 241 of the rear section 24 of the inner lining, so as to fix the front section 23 of the inner lining to the rear section 24 of the inner lining, thereby realizing the fixed connection between the front section 23 and the rear section 24 of the inner lining.

[0130] Exemplarily, the connecting member 232 can be a bolt or a screw.

[0131] 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 embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated herein one by one.

[0132] In this embodiment, the gas equipment can be a gas water heater, a wall-mounted boiler, a gas stove and other equipment. The gas equipment 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 then flows out of the burner through the fire holes of the burner to realize ignition and combustion. Among them, under the adjustment of the premixer 100, the load adjustment range of the gas equipment can be improved, so that the user has a better heating use experience.

[0133] 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 directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A premixer, characterized in that, Comprising: A housing having an inner cavity, an air inlet, and a gas inlet communicating with the inner cavity; A lining disposed in the inner cavity and including a front lining section and a rear lining section axially distributed. The front lining section is provided with a front flow channel, and the rear lining section is provided with a rear flow channel. The front flow channel and the rear flow channel are connected and form an air flow channel communicating with the air inlet. The rear lining section is provided with a gas flow channel communicating with the gas inlet; A regulating plate disposed on a side of the rear lining section away from the front lining section 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 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.

2. The premixer according to claim 1, characterized in that, The cross-sectional area of the front flow channel is larger than that of the rear flow channel.

3. The premixer according to claim 2, characterized in that, In the direction from the front lining section to the rear lining section, the cross-sectional area of the front flow channel gradually decreases.

4. The premixer according to claim 3, wherein In the direction from the front lining section to the rear lining section, the cross-sectional area of the rear flow channel gradually decreases.

5. The premixer according to any one of claims 1 to 4, characterized in that The regulating plate and the lining are coaxially arranged, and one of the lining and the regulating plate can rotate coaxially relative to the other 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.

6. The premixer according to claim 5, characterized in that, The size of the first communication area is positively correlated with the size of the second communication area.

7. The premixer according to claim 5, wherein The lining is fixed to the housing, and the premixer further includes a driving assembly drivingly connected to the regulating plate, and the driving assembly drives the regulating plate to rotate relative to the lining.

8. The premixer according to claim 7, characterized in that, The driving assembly includes: A driving motor disposed on the housing and having an output shaft extending into the inner cavity; A transmission shaft, one end of which is drivingly connected to the output shaft and the other end of which is connected to the regulating plate.

9. The premixer according to claim 8, characterized in that, The output shaft extends along the radial direction of the lining, the transmission shaft extends along the axial direction of the lining, and the output shaft meshes with the transmission shaft.

10. The premixer according to claim 9, characterized in that, The lining is provided with an avoidance channel extending along the central axis, and the transmission shaft passes through the avoidance channel and is spaced from the lining.

11. The premixer according to claim 10, wherein, The front lining section and the rear lining section cooperate to form an avoidance groove communicating with the avoidance channel, and one end of the output shaft extends into the avoidance groove to mesh with the transmission shaft.

12. The premixer according to claim 11, characterized in that, The avoidance groove is disposed on an end face of the front lining section close to the rear lining section.

13. The premixer according to claim 12, characterized in that, The avoidance groove includes: A mating groove coaxially arranged with the avoidance channel; An avoidance opening communicating with the mating groove and penetrating from the mating groove to the circumferential side wall of the front lining section, and one end of the output shaft extends into the mating groove from the avoidance opening.

14. The premixer according to claim 13, characterized in that, The width of the avoidance opening gradually increases in the direction from the mating groove to the circumferential side wall of the front lining section.

15. The premixer according to any one of claims 1 to 4, characterized in that, The front lining section is provided with a first connection hole, and the rear lining section is provided with a second connection hole. The front lining section is fixed to the rear lining section by a connecting member passing through the first connection hole and inserted into the second connection hole.

16. A gas device, characterized in that, Including the premixer according to any one of claims 1 to 15.

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