A premixing device suitable for multiple gas sources and a gas water heater

Abstract

The application discloses a premixer suitable for multiple gas sources and a gas water heater. The premixer comprises a shell, a premixing cavity provided in the shell, a gas passage communicated with the premixing cavity, and an adjusting device for adjusting the gas flow area of the gas passage. The premixer is provided with the adjusting device, which is beneficial to the unified mass production of products, improves the production efficiency, and reduces the product cost. By replacing the adjusting device or part of the components, products suitable for different gas sources can be obtained, which is more beneficial to the replacement of the gas source of the sold products. In addition, the same gas source can be adjusted by fine adjustment. The adjusting device can be a nozzle with different sizes, an object with different angles to generate different areas, an object with different depths to generate different cross-sectional areas, and the like. The original gas path can be designed according to the gas source with low Wobbe number. When the gas source with high Wobbe number is replaced, the area of the gas path is reduced by adding components.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas water heaters, in particular to a mixer for full premixing of air and gas in a gas water heater. BACKGROUND

[0002] In a gas water heater, gas combustion is divided into diffusion combustion, partial premixing combustion (atmospheric combustion) and full premixing combustion. Full premixing combustion refers to that air and gas are fully mixed according to a certain ratio to form premixed gas, and the premixed gas is ignited and combusted in a burner. Premixing combustion generally occurs in a relatively closed system. Premixing combustion has faster flame propagation speed, higher combustion temperature and better ductility than diffusion combustion because the gas and air (oxygen) are fully mixed before combustion, and is widely used on gas appliances.

[0003] A premixer used in a conventional full premixing combustion system has only one premixing cavity, so that the combustion system cannot normally combust in a small load operation state, resulting in a small combustion system regulation ratio and affecting user experience. Therefore, a premixer including two premixing cavities appears in the prior art, which divides the conventional premixing cavity into two halves, one half being always open (suitable for a small load working condition) and the other half being controllably open and closed (suitable for a large load working condition). Although the above structure can improve the regulation ratio, the structure of the premixer is relatively complex, the production and processing procedures are more, and the production cost is high. At the same time, because the Wobbe numbers of gas paths of different gas sources are different, when the water heater is used for different gas sources, different premixers often need to be replaced, which undoubtedly increases the production cost of enterprises. SUMMARY

[0004] The present application aims to provide a premixer adapted to multiple gas sources to solve one or more technical problems in the prior art and at least provide a beneficial choice or create conditions.

[0005] The solution to the technical problem of the present application is:

[0006] A premixer adapted to multiple gas sources, comprising: a shell, a premixing cavity being provided in the shell, the premixing cavity being provided through the shell; a gas passage, the gas passage being in communication with the premixing cavity; and an adjusting device, the adjusting device being configured to adjust a gas flow area of the gas passage.

[0007] The premixer is provided with an adjusting device, which is beneficial to mass production of products, improves production efficiency, and reduces product cost; only the adjusting device or part of the parts need to be replaced to adjust the products of different gas sources, which is more beneficial to gas source replacement of sold products, and can also adapt to large changes in the same gas source through fine adjustment. The original gas path can be designed according to the low calorific value of the gas source, and when the gas source with high calorific value is replaced, the area of the gas path is reduced by adding parts.

[0008] As a further improvement of the above technical solution, the adjusting device comprises a control part and an adjusting part, the control part is movably connected with the shell, and the adjusting part is located in the gas passage, the control part rotates to drive the adjusting part to change position or angle to adjust the gas flow area.

[0009] As a further improvement of the above technical solution, the premixing cavity has two, and the two premixing cavities are a first premixing cavity and a second premixing cavity, the gas passage comprises an air inlet pipeline, a first gas pipeline and a second gas pipeline, the first gas pipeline and the second gas pipeline are in communication with the air inlet pipeline, the first gas pipeline is in communication with the first premixing cavity, and the second gas pipeline is in communication with the second premixing cavity. For example, the present application can separate the traditional single premixing cavity into two premixing cavities by using a partition plate, and the gas and air are premixed in different premixing cavities, so that the gas mixing is more uniform.

[0010] As a further improvement of the above technical solution, the adjusting device has two, and the two adjusting devices are a first adjusting device and a second adjusting device, the first adjusting device comprises a first adjusting part and a first control part, the first control part is cylindrical, the cross section of the first adjusting part is smaller than the cross section of the first control part, the side wall of the first gas pipeline or the second gas pipeline is provided with a first through hole, the first adjusting part passes through the first through hole, the first control part is rotatably connected with the first through hole, and the first adjusting part changes the corresponding position of the first gas pipeline or the second gas pipeline with the rotation of the first control part, so as to change the gas flow area of the first gas pipeline or the second gas pipeline. When the first control part is rotated, the first adjusting part rotates in the first gas passage. Since the first adjusting part has different projection areas at different rotation angles, the gas flow area in the gas passage can be changed by changing the rotation angle of the first adjusting part.

[0011] As a further improvement of the above technical solution, the first premixing cavity is located above the second premixing cavity, the first gas pipe includes a first gas port, the first gas port is located above the first gas pipe, and the first adjusting device is arranged in the first gas pipe.

[0012] As a further improvement of the above technical solution, the first gas pipe and the second gas pipe are coaxially arranged, the second gas pipe includes a second gas port, the second gas port is located on the front side of the second gas pipe, the rear side of the second gas pipe is provided with a second through hole, the second gas port and the second through hole are located on the same horizontal line, and the second through hole is provided with an internal thread; the second adjusting device includes a second adjusting part and a second control part, the second control part is provided with an external thread, and the second control part is threadedly connected with the second through hole to adjust the relative position of the second adjusting part and the second gas port in the front-rear direction. The coaxial arrangement of the two gas pipes can make the structure of the premixer more compact.

[0013] As a further improvement of the above technical solution, the second adjusting part includes a first adjusting rod and a second adjusting rod arranged along the front-rear direction, the first adjusting rod is away from the second gas port relative to the second adjusting rod, and the cross-sectional area of the first adjusting rod is greater than that of the second adjusting rod. When the second control part is rotated, the first control part moves forward and backward, and because the first control part has adjusting rods with different outer diameters, the flow area of the second gas port can be effectively changed when different adjusting rods are inserted into the second gas port.

[0014] As a further improvement of the above technical solution, the first gas pipe and the second gas pipe are arranged side by side, the second gas pipe includes a second gas port, the second gas port is located above the second gas pipe, the second adjusting device is arranged in the second gas pipe, and the second adjusting device has the same structure as the first adjusting device.

[0015] As a further improvement of the above technical solution, the first premixing cavity and the second premixing cavity are arranged side by side, and both the first premixing cavity and the second premixing cavity are Venturi tubes; the adjusting device has two adjusting devices, and the two adjusting devices are respectively arranged in the first gas pipe and the second gas pipe. As a further improvement of the above technical solution, the minimum cross-sectional area of the first premixing cavity is greater than that of the second premixing cavity. The cross-sectional areas of the two premixing cavities are different, which can further increase the heat load adjustment ratio of the water heater.

[0016] As a further improvement of the above technical solution, the adjusting device further comprises an electric adjusting part for controlled driving of the adjusting device; or, the adjusting device further comprises a manual adjusting part, which is at least partially exposed outside the housing, and is used for driving the adjusting device.

[0017] As a further improvement of the above technical solution, further comprising a wind baffle and a gas baffle, the upper end of the wind baffle and the upper end of the gas baffle are both hinged to the housing, the wind baffle is used for adjusting the opening degree of the air port of the premixing cavity in the through direction, and the gas baffle is used for adjusting the opening degree of the gas port of the gas passage to the premixing cavity. By adding the wind baffle and the gas baffle in one of the premixing cavities, the cavity space and the gas input of the premixing cavity can be adjusted, especially in the small load range.

[0018] Meanwhile, the application further provides a gas water heater using the premixer suitable for multiple gas sources. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly described below. Obviously, the described drawings are only some of the embodiments of the application, not all the embodiments, and those skilled in the art can obtain other design schemes and drawings according to these drawings without creative labor.

[0020] Figure 1 is a structural schematic diagram of the embodiment one of the application;

[0021] Figure 2 is a structural schematic diagram of the embodiment two of the application;

[0022] Figure 3 is a structural schematic diagram of the embodiment three of the application;

[0023] Figure 4 is a three-dimensional schematic diagram of the first adjusting device of the application;

[0024] Figure 5 is a schematic diagram of the first adjusting device of the application in state one;

[0025] Figure 6 is a schematic diagram of the first gas pipeline of the application in state one;

[0026] Figure 7 is a schematic diagram of the first adjusting device of the application in state two;

[0027] Figure 8 is a schematic diagram of the first gas pipeline of the application in state two;

[0028] Figure 9 is a schematic diagram of the second adjusting device of the present application in working condition one;

[0029] Figure 10 is a schematic diagram of the second adjusting device of the present application in working condition two;

[0030] Figure 11 is a schematic diagram of the second adjusting device of the present application in working condition three;

[0031] Figure 12 is a schematic diagram of the structure of the fourth embodiment of the present application;

[0032] Figure 13 is a side sectional view of the fourth embodiment of the present application. DETAILED DESCRIPTION

[0033] The concept, specific structure and generated technical effects of the present application will be described clearly and completely in combination with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. The preferred embodiments of the present application are shown in the drawings, and the drawings are used to supplement the description in the text part of the specification, so that one can understand the technical features and the overall technical scheme of the present application intuitively and visually. However, it cannot be understood as a limitation on the protection scope of the present application.

[0034] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In the description of the present application, several meanings are one or more, and multiple meanings are two or more. Greater than, less than, more than and the like are understood as not including the number, and above, below and the like are understood as including the number. If the first and the second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0036] In the description of the present application, unless otherwise explicitly defined, the words such as arrangement, installation, connection and the like should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution. Meanwhile, each technical feature in the present application can be combined interactively without contradiction and conflict.

[0037] Embodiment one: see Figure 1 A premixer suitable for multiple gas sources, comprising: a housing 100, a premixing cavity is arranged in the housing 100, the premixing cavity is arranged through the housing; a gas passage 200, the gas passage 200 is communicated with the premixing cavity; an adjusting device 400, the adjusting device is used to adjust the gas flow area of the gas passage 200.

[0038] Embodiment two: see Figure 2 Different from embodiment one, the premixing cavity in this embodiment has two, and the gas passage 200 and the adjusting device 400 also have two.

[0039] Embodiment three: see Figures 3-11 A premixer suitable for multiple gas sources, comprising: a housing 100, a gas passage 200, an adjusting system 300, a gas source adaptation system.

[0040] The housing 100 has a premixing cavity, the structure of the premixing cavity is based on a Venturi-shaped cavity structure, when working, the gas passes through the premixing cavity from back to front, there is a throat with a smaller cross section between the inlet and the outlet of the cavity, after the air and the gas pass through the throat of the premixing cavity, different pressure differences and flow rate differences will be generated on the front side and the rear side of the throat. There is a throat with a smaller cross section between the inlet and the outlet, according to the formula gas flow Q = gas flow velocity V x cross section area S, throat gas flow velocity V2 = V1 x S1 / S2, the gas flow velocity V will change with the different cross section areas S.

[0041] The housing 100 is provided with a partition plate 130, the partition plate 100 divides the premixing cavity into a first premixing cavity 110 and a second premixing cavity 120, the first premixing cavity 110 comprises a first gas outlet 111; the gas passage 200 comprises an air inlet pipe 230, a first gas pipe 210 and a second gas pipe 220, the first gas pipe 210 and the second gas pipe 220 are both communicated with the air inlet pipe 230, the first gas pipe 210 is communicated with the first premixing cavity 110, the second gas pipe 220 is communicated with the second premixing cavity 120, the first gas pipe 210 comprises a first gas port 211, and the second gas pipe 220 comprises a second gas port 221;

[0042] The adjusting system 300 comprises a wind baffle 310 and a gas baffle 320, the upper end of the wind baffle 310 and the upper end of the gas baffle 320 are hinged to the shell 100, the wind baffle 310 covers the first gas outlet 111 of the first premixing cavity 110, and the gas baffle 320 covers the first gas port 211 of the first gas pipeline 210;

[0043] The gas source adapting system comprises two adjusting devices 400, the two adjusting devices 400 are respectively installed on the first gas pipeline 210 and the second gas pipeline 220, and the two adjusting devices 400 respectively adjust the gas flow area of the first gas pipeline 210 and the second gas pipeline 220. The two adjusting devices 400 are respectively a first adjusting device 410 and a second adjusting device 420, the first adjusting device 410 comprises a first adjusting part 411 and a first control part 412, the first control part 412 is in a cylindrical shape, the cross section of the first adjusting part 411 is smaller than the cross section of the first control part 412, the side wall of the first gas pipeline 210 is provided with a first through hole, the first adjusting part 411 passes through the first through hole, and the first control part 412 is rotationally connected with the first through hole. The second gas port 221 is located on the front side of the second gas pipeline 220, the rear side of the second gas pipeline 220 is provided with a second through hole, the second gas port 221 and the second through hole are located on the same horizontal line, the second through hole is provided with an internal thread, the second adjusting device 420 comprises a second adjusting part 421 and a second control part 422, the second adjusting part 421 comprises two or more adjusting rods along the front-rear direction, the second adjusting part 421 comprises a first adjusting rod 4211 and a second adjusting rod 4212 arranged along the front-rear direction, the first adjusting rod 4211 is away from the second gas port 221 relative to the second adjusting rod 4212, and the cross-sectional area of the first adjusting rod 4211 is greater than that of the second adjusting rod 4212; the second control part 422 is provided with an external thread, and the second control part 422 is threadedly connected with the second through hole.

[0044] When working, the premixer of the technical solution is installed in the water heater, and the water heater includes a fan. When the fan is started, a pressure difference is generated between the front and the rear of the premixer, which causes the air to pass through the premixer from the rear to the front. When the air passes through the hollow chamber, since the premixing chamber is in a venturi structure, the flowing air will generate a negative pressure in the throat of the chamber, which causes the gas to enter the premixing chamber, and then the gas and the air are mixed in the premixing chamber, and then the mixed gas is sent to the burner in the water heater for full combustion. Since the air and the gas are fully premixed in the premixer, the combustion flame propagation speed in the burner is fast, the combustion chamber volume heat intensity is high, and complete combustion can be achieved under a small excess air coefficient. By adjusting the operating parameters of the fan of the water heater, different load working states of the water heater can be realized.

[0045] Moreover, in the premixer, the second premixing chamber 120 and the second gas pipeline 220 are in a constant open working state, and the first premixing chamber 110 and the first gas pipeline 210 are adjustable. The gas and the air can be premixed in different premixing chambers respectively, and the gas mixing is more uniform. At the same time, the space in the first premixing chamber and the gas input amount can be adjusted, especially in the small load range, which is accurately controllable. The air and the gas maintain a stable air-fuel ratio in the predetermined load range, realize stable and complete combustion of the gas in the whole water heater, and have a gas source adaptation system. The two gas passages have different gas flow areas, which is beneficial to the unified production of products in large quantities, improves the production efficiency, and reduces the product cost. Only the adjusting device or part of the parts need to be replaced to adjust the products of different gas sources, which is more beneficial to the replacement of the gas source of the sold products. It can also be adjusted by fine tuning to adapt to a larger change of the same gas source.

[0046] Specifically, the adjustment principle of the first premixing chamber is as follows:

[0047] When the fan starts, a negative pressure is formed in the hollow chamber, which provides an upward lift to the baffle 310. When the rotating speed of the fan increases from small to large, the lift increases continuously. When the lift and the gravity of the baffle 310 form a balance, the baffle 310 will rotate to open an angle. Of course, the higher the rotating speed of the fan, the larger the opening angle. When the baffle 310 rotates, the negative pressure starts to provide an upward lift to the baffle 320. When the lift and the gravity of the baffle 320 form a balance, the baffle 320 will rotate to open an angle. At this time, the first gas pipeline 210 is opened, and the gas flows to the outlet side after being mixed with air in the first premixing chamber 110. By setting the relationship between the rotating speed of the water heater fan and the gravity of the baffle 310, the water heater can realize segmented load supply. When the load is small, only the second gas pipeline supplies gas. When the load is large, the rotating speed of the water heater fan is increased to make the baffle rotate, start the first gas pipeline 210, and realize wide frequency adjustment of gas and air in the water heater at each load interval.

[0048] The principle of the adaptive adjustment of the gas source is as follows:

[0049] First, see the adjustment principle of the first adjustment device 410 in Figures 3-8 , the first gas pipeline 210 is vertically upward, and the outlet of the first gas pipeline 210 is located directly above. The first adjustment device 410 includes a first adjustment part 411 and a first control part 412. The rear wall of the first gas pipeline 210 is provided with a first through hole, the first adjustment part 411 passes through the first through hole, and the first control part 412 is rotationally connected with the first through hole. Since the first adjustment part 411 is not cylindrical, when the first control part 412 rotates in the first through hole, the first adjustment part 411 will produce different projection areas in the first gas pipeline 210. For details, see Figure 5 , when the first adjustment part 411 is in state one, see Figure 6 , the flow area of the first gas pipeline 210 is S1, see Figure 7 , when the first adjustment part 411 is in state two, see Figure 8 , the flow area of the first gas pipeline 210 is S2. By comparison, S2 is greater than S1.

[0050] Then, see the adjustment principle of the second adjustment device 420 in Figure 3 , Figures 9-11, the second adjusting device 420 includes a second adjusting part 421 and a second control part 422, the second adjusting part 421 includes two or more adjusting rods along the front-rear direction, the second adjusting part 421 includes a first adjusting rod 4211 and a second adjusting rod 4212 arranged along the front-rear direction, the first adjusting rod 4211 is away from the second adjusting rod 4212 relative to the second gas port 221, the cross-sectional area of the first adjusting rod 4211 is greater than that of the second adjusting rod 4212; the second control part 422 is provided with external threads, and the second control part 422 is threadedly connected with the second through hole. Referring to Figure 9 At the time of working condition one, that is, when the second control part 422 is located at the last side, the frontmost end of the second adjusting part 421 is away from the second gas port 221, and the flow area of the second adjusting part 421 and the second gas port 221 is S A +S B However, S A +S B <S D The area (S D is the cross-sectional area of the second gas port 221), and the flow area of the second gas port is S D When the second control part 422 is screwed, the second control part 422 drives the first adjusting part 421 to move forward, and when working condition two is reached, referring to Figure 10 , the frontmost end of the second adjusting part 422 is deeply inserted into the second gas port, and the cross-sectional area of the adjusting rod at this time is S E , and the flow area of the second gas port is S D -S E , and the flow area is reduced; when the second control part 422 is continuously screwed, the second control part 422 continuously drives the first adjusting part 421 to move forward, and when working condition three is reached, referring to Figure 11 , the second adjusting rod of the second adjusting part 422 is deeply inserted into the second gas port, and the cross-sectional area of the second adjusting rod at this time is S F , and the flow area of the second gas port is S D -S F Since S E <S F The flow area is further reduced.

[0051] Therefore, by the above adjusting system, the flow areas of the first gas pipeline 210 and the second gas pipeline 220 can be changed to adapt to different gas sources.

[0052] In some embodiments, the first adjusting device 410 and the second adjusting device 420 can be interchangeable or have the same structure.

[0053] Referring toFigure 3 As a further preferred embodiment, the first premixing chamber 110 is located above the second premixing chamber 120, the gas connection seat 140 is located below the second premixing chamber 120, the first gas pipeline 210 and the second gas pipeline 220 are coaxially arranged, and the first gas port 211 of the first gas pipeline 210 is located above the second gas pipeline 220.

[0054] In some embodiments, the gas inlets of both the first gas pipeline 210 and the second gas pipeline 220 are forward-facing. In this case, both adjustment devices 400 can adopt the structure of the second adjustment device 420.

[0055] Of course, in some embodiments, such as Embodiment 2, the first premixing chamber 110 may be located below the second premixing chamber 120, and the first gas pipeline 210 and the second gas pipeline 220 may be arranged side by side with both gas ports facing upward. In this case, the adjustment device 400 may have the same structure, such as the structure of the first adjustment device 410 in Embodiment 3.

[0056] As a further preferred embodiment, a shoulder platform 112 is provided on the front side of the premixing chamber 110. The shoulder platform 112 includes a table surface, which is inclined to the horizontal plane. The wind deflector 310 is inclined downward from back to front, and the lower surface of the wind deflector 310 overlaps with the table surface of the shoulder platform 112.

[0057] As a further preferred embodiment, the baffle plate 320 is located behind the wind deflector plate 310. The baffle plate 320 includes a connecting plate 321 and a cover plate 322. The connecting plate 321 is inclined downward from back to front. The cover plate 322 is located at the lower end of the connecting plate 321. The first gas port 211 is vertically upward, and the cover plate 322 covers the first gas port 211.

[0058] Of course, in Embodiment 2, a similar structure to the wind deflector 310 and air deflector 320 as in this embodiment can also be provided.

[0059] Example 4:

[0060] See Figure 12 , Figure 13 Unlike Embodiment 1, the first premixing chamber 110 and the second premixing chamber 120 are arranged side by side, and the cross-sections of the first premixing chamber 110 and the second premixing chamber 120 are both circular.

[0061] Further as a preferred embodiment, no matter the two premixing cavities are arranged in up-down or left-right, the minimum cross-sectional area of the first premixing cavity 110 is larger than that of the second premixing cavity 120. In this embodiment, the two adjusting devices can be the same. They can be the first adjusting device 410 or the second adjusting device 420.

[0062] The above describes the preferred embodiments of the present application, but the present application is not limited to the above-mentioned embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are included in the scope defined by the claims of the present application.

Claims

1. A premixing device adapted for multiple gas sources, characterized by: The utility model relates to a kind of gas stove, including: Shell (100), premixing cavity is provided in the shell (100), and the premixing cavity is throughly arranged in the shell; Gas passage (200), the gas passage (200) is communicated with the premixing cavity; Adjusting device (400), the adjusting device adjusts the gas flow area of the gas passage (200); The premixing cavity has two, and the two premixing cavities are first premixing cavity (110) and second premixing cavity (120) respectively, the gas passage (200) includes gas inlet pipe (230), first gas pipe (210) and second gas pipe (220), the first gas pipe (210), the second gas pipe (220) are communicated with the gas inlet pipe (230), the first gas pipe (210) is communicated with first premixing cavity (110), and the second gas pipe (220) is communicated with second premixing cavity (120); It further includes baffle (310) and gas baffle (320), the upper end of the baffle (310) and the upper end of the gas baffle (320) are hinged with the shell (100) and are arranged in the first premixing cavity (110), second premixing cavity (120) and second gas pipe (220) are in the working condition of constant passage, and first premixing cavity (110) and first gas pipe (210) are in adjustable condition, the baffle (310) is used to adjust the air opening of the premixing cavity in through direction, and the gas baffle (320) is used to adjust the gas opening of the gas passage (200) leading to the premixing cavity;The rotation angle of the baffle (310) and the gas baffle (320) is controlled by the speed of fan; The adjusting device (400) has two, and the two adjusting devices (400) are first adjusting device (410) and second adjusting device (420) respectively; The first premixing cavity (110) is located above the second premixing cavity (120), the first gas pipe (210) includes first gas port (211), and the first gas port (211) is located above the first gas pipe (210), and the first adjusting device (410) is arranged in the first gas pipe (210); The first gas pipe (210) and the second gas pipe (220) are coaxially arranged, the second gas pipe (220) includes second gas port (221), and the second gas port (221) is located at the front side of the second gas pipe (220), and the second adjusting device (420) is arranged in the second gas pipe (220).

2. The premix adapted for multiple gas sources of claim 1, wherein, The adjusting device includes control part and adjusting part, the control part is movably connected with the shell, and the adjusting part is located in the gas passage (200), and the control part rotates and drives the adjusting part to change position or angle to adjust gas flow area.

3. The premix adapted for multiple gas sources of claim 1, wherein, The first adjusting device (410) comprises a first adjusting part (411) and a first control part (412), the first control part (412) is in a cylindrical shape, the cross section of the first adjusting part (411) is smaller than that of the first control part (412), a first through hole is arranged on the side wall of the first gas pipe (210) or the second gas pipe (220), the first adjusting part (411) passes through the first through hole, the first control part (412) is rotationally connected with the first through hole, the first adjusting part (411) changes the corresponding position of the first gas pipe (210) or the second gas pipe (220) along with the rotation of the first control part (412), so as to change the gas flow area of the first gas pipe (210) or the second gas pipe (220).

4. The premix adapted for multiple gas sources of claim 1, wherein: The rear side of the second gas pipe (220) is provided with a second through hole, the second gas outlet (221) is located on the same horizontal line with the second through hole, and the second through hole is provided with an internal thread; the second adjusting device (420) comprises a second adjusting part (421) and a second control part (422), the second control part (422) is provided with an external thread, and the second control part (422) is threadedly connected with the second through hole to adjust the relative position of the second adjusting device (420) and the second gas outlet (221) in the front-rear direction.

5. The premix adapted for multiple gas sources of claim 4, wherein: The second adjusting part (421) comprises a first adjusting rod (4211) and a second adjusting rod (4212) arranged along the front-rear direction, the first adjusting rod (4211) is away from the second gas outlet (221) relative to the second adjusting rod (4212), and the cross section area of the first adjusting rod (4211) is larger than that of the second adjusting rod (4212).

6. The premix adapted for multiple gas sources of claim 1, wherein: The adjusting device (400) further comprises an electric adjusting part for controlled driving of the adjusting device; or, The adjusting device (400) further comprises a manual adjusting part, the manual adjusting part is at least partially exposed outside the shell, and the manual adjusting part is used for driving the adjusting device.

7. A gas water heater characterised by: The premixer is adapted to multiple gas sources, and comprises the adjusting device according to any one of claims 1-6. The premixer is adapted to multiple gas sources, and comprises the adjusting device according to any one of claims 1-6.

Images