A backflow prevention premixer and a gas water heater

Abstract

The present invention discloses an anti-backflow premixer and a gas water heater. The anti-backflow premixer includes a shell, a premixing chamber is provided in the shell, and the premixing chamber includes an air outlet passage; a baffle, the baffle is connected to the shell, the baffle has a first position and a second position, and the baffle can move continuously between the first position and the second position, the baffle blocks the air outlet passage of the premixing chamber when it is in the first position, and the opening of the air outlet passage gradually increases when the baffle moves from the first position to the second position; a gas channel, the gas channel is connected to the premixing chamber. The present invention greatly improves product safety by adding a baffle to the premixer and using the baffle to completely seal the premixing chamber. At the same time, through the gradual movement of the baffle, the air and gas in the water heater maintain a stable air-fuel ratio in a predetermined load range, so that the gas in the water heater is stably and completely burned.

Description

Technical Field

[0001] The invention relates to the technical field of gas water heaters, in particular to a mixer for fully premixing air and gas in a gas water heater. Background Art

[0002] In gas water heaters, gas combustion is divided into diffusion combustion, partial premixed combustion (atmospheric combustion) and full premixed combustion. Full premixed combustion refers to the process in which air and gas are fully mixed in a certain proportion to form a premixed gas, and the premixed gas is then ignited and burned in the burner. Premixed combustion generally occurs in a relatively closed system. Compared with diffusion combustion, premixed combustion has a faster flame propagation speed, higher combustion temperature and better ductility because the gas and air (oxygen) are fully mixed before combustion. It has good application prospects in gas water heaters.

[0003] In the winter in the north, the temperature outdoors is generally below zero degrees, while the temperature indoors is above 20 degrees. The temperature difference creates an easy way for cold air outdoors to enter the gas water heater through the exhaust channel, thereby freezing the heat exchanger of the water heater (water freezes and cracks the water pipes). Non-condensing machines generally have a backflow prevention device added to the exhaust port of the water heater, but most of the fully premixed combustion water heaters are condensing machines. If a backflow prevention device is added to the exhaust port, it will usually be frozen by the frozen condensed water and cannot be opened, causing the water heater to fail to work. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-backflow premixer to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The solution of the present invention to solve its technical problem is:

[0006] A backflow prevention premixer, comprising:

[0007] A shell, wherein a premixing chamber is provided in the shell, the premixing chamber is disposed through the shell, and the premixing chamber includes an air outlet passage;

[0008] a baffle, the baffle being connected to the housing, the baffle having a first position and a second position, and the baffle being continuously movable between the first position and the second position, the baffle blocking the gas outlet passage of the premixing chamber when in the first position, and the opening of the gas outlet passage gradually increasing when the baffle moves from the first position to the second position;

[0009] A gas channel is communicated with the premixing chamber.

[0010] The beneficial effects of the present invention are as follows: the present invention adds a baffle in the premixer, and when not working, the baffle is used to completely seal the premixing chamber, so that the airflow cannot flow back, and the cold air is prevented from flowing back to the heat exchanger to cause damage, and the high-temperature flue gas is prevented from flowing back to the fan and the water heater, so as to protect the normal use of the product, increase its service life, and greatly improve the product safety. When working, the air and gas in the water heater maintain a stable air-fuel ratio in a predetermined load range through the gradual movement of the baffle, so as to achieve stable and complete combustion of the gas in the water heater.

[0011] As a further improvement of the above technical solution, the baffle uses its own gravity to block the air outlet passage, and the shell is provided with an inclined table on the peripheral wall of the premixing chamber; when the baffle is in the first position, one end of the baffle is hinged to the shell, and the other end is tilted downward and abuts against the table. The baffle uses its own gravity to achieve the blocking of the baffle. When working, the water heater is provided with a fan, and the negative pressure generated by the fan overcomes the gravity of the baffle to open the baffle, and when the water heater is not working, the fan stops running, and the baffle returns to the first position under the action of its own gravity. The inclined table is equivalent to a limit seat, which makes the baffle have a certain inclined initial state, which is convenient for the baffle to be opened later when working.

[0012] As a further improvement of the above technical solution, one end of the baffle is hinged to the shell, and an elastic member is provided between the baffle and the shell, and the elastic member applies a force to the baffle to move to the first position. In addition to using gravity to restore the baffle to the first position, the baffle can also be reset by using an elastic member, one end of the elastic member abuts against the baffle and the other end abuts against the shell, and the elastic member forces the baffle to move to the first position.

[0013] As a further improvement of the above technical solution, the elastic member is a compression spring, one end of the elastic member is adjustably connected to the housing, and the other end abuts against the baffle. For example, a threaded member can be provided in the housing, the threaded member is threadedly connected to the housing, one end of the threaded member abuts against the compression spring, and the pre-compression force of the elastic member can be adjusted by adjusting the initial position of the threaded member, thereby adjusting the opening force of the baffle.

[0014] As a further improvement of the above technical solution, a cover plate is further provided in the premixing chamber, the cover plate is tilted downward from the back to the front, the upper end of the cover plate is hinged to the inner surface of the shell, and the cover plate covers the gas channel under the action of its own weight. By adding the cover plate, the gas outlet is sealed and gas cannot be discharged when the baffle is not opened, eliminating the risk of direct gas discharge due to misoperation or failure of the gas valve, thereby improving product safety.

[0015] As a further improvement of the above technical solution, the gas channel includes a gas outlet, and when the baffle is in the first position, the gas outlet abuts against the baffle. The baffle seals the gas outlet and the gas outlet passage at the same time, making the structure of the premixer simpler.

[0016] As a further improvement of the above technical solution, there are two premixing chambers, which are arranged side by side on the left and right, and both of them are venturi tubes; the baffle is provided in both premixing chambers. Both premixing chambers arranged side by side have gas outlets, and when working, the adjustment range of product heat load and temperature can be increased at the same fan speed, and the product comfort can be improved, especially for products with large loads.

[0017] As a further improvement of the above technical solution, the two premixing chambers are respectively a first premixing chamber and a second premixing chamber, and the minimum cross-sectional area of ​​the first premixing chamber is greater than the minimum cross-sectional area of ​​the second premixing chamber. The cross-sectional areas of the two premixing chambers are different, which can further increase the heat load adjustment ratio of the water heater.

[0018] As a further improvement of the above technical solution, the two baffles are respectively a first baffle and a second baffle, the first baffle is installed in the first premixing chamber, the second baffle is installed in the second premixing chamber, and the driven force of the first baffle is greater than the driven force of the second baffle. For baffles of two or more premixing chambers, if one of the baffles has a small mass m, or a large force area S, or a small value of the acute angle B, its driven force will be small. When working, under the same fan speed, it will open first and the other will not open, forming segmented air intake combustion, which can improve the adjustment range of the heat load of the water heater, improve the range of adjusting the temperature, and improve the comfort of the product, especially for products with large loads.

[0019] As a further improvement of the above technical solution, an adjusting device is provided in the gas channel, and the adjusting device is used to adjust the minimum flow area of ​​the gas channel. The adjusting device is provided in the gas channel, which is conducive to the mass production of products, improves production efficiency, and reduces product costs. It only needs to replace the adjusting device or some parts to adjust to products with different gas sources, which is more conducive to gas source replacement for products that have been sold. It can also be adapted to large changes in the same gas source through fine-tuning. The adjusting device can be equipped with nozzles of different sizes, objects of different areas at different angles, objects of different cross-sectional areas at different depths, etc. The original gas path can be designed according to a gas source with a low Wobbe number. When changing to a gas source with a high Wobbe number, parts are added to reduce the area of ​​the gas channel, etc.

[0020] As a further improvement of the above technical solution, the regulating device includes a connecting portion and an regulating portion which are connected to each other, the connecting portion is arranged on the peripheral wall of the gas channel and is rotatably connected to the shell, the regulating portion is at least partially located in the gas channel, and the regulating portion changes the minimum flow area of ​​the gas channel as the connecting portion rotates.

[0021] As a further improvement of the above technical solution, the gas channel includes a first adjustment section and a second adjustment section connected in series, the first adjustment section and the second adjustment section are perpendicular to each other, the connecting portion is arranged on the peripheral wall of the first adjustment section and is rotatably connected to the shell, the adjustment portion is inserted into the second adjustment section, and the two adjustment devices arranged on the two gas channels are arranged side by side. The two adjustment devices are arranged side by side for easy adjustment on the same side.

[0022] As a further improvement of the above technical solution, the gas channel is in the shape of a circular tube, the adjusting part is located at the connection between the first adjusting section and the second adjusting section, the adjusting part is in the shape of a block, the cross-sectional area of ​​the adjusting part is adapted to the pipe diameter of the second adjusting section, and the adjusting part is eccentrically arranged on the connecting part. In this way, by rotating the connecting part, the connecting part is respectively located at three different positions of 0°, 90° and 180°. At the three different positions, the adjusting part can realize three different adjustments to the minimum flow area of ​​the gas channel, and thus can realize three flow area adjustment effects.

[0023] As a further improvement of the above technical solution, the adjusting device also includes an electric adjusting part, which is used to controllably drive the connecting part; and / or the adjusting device also includes a manual adjusting part, which is at least partially visible outside the shell, and is used to drive the connecting part.

[0024] At the same time, the present invention also provides a gas water heater using the anti-backflow premixer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0026] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0027] Figure 2 is a force analysis diagram of the first embodiment of the present invention;

[0028] Figure 3is a schematic diagram of the working state of the first embodiment of the present invention;

[0029] Figure 4 is a schematic structural diagram of Embodiment 2 of the present invention;

[0030] Figure 5 is a schematic structural diagram of Embodiment 3 of the present invention;

[0031] Figure 6 is a three-dimensional schematic diagram of a fourth embodiment of the present invention;

[0032] Figure 7 is a schematic structural diagram of a fourth embodiment of the present invention;

[0033] Figure 8 is a three-dimensional schematic diagram of the regulating device of the present invention;

[0034] Fig. 9 is a schematic diagram of the installation of the regulating device of the present invention;

[0035] Figure 10-A is a schematic diagram of a first state of the regulating device of the present invention;

[0036] Figure 10-B is a schematic diagram of a second state of the regulating device of the present invention;

[0037] Figure 10-C 3 is a schematic diagram of the third state of the regulating device of the present invention. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. The preferred embodiments of the present invention are shown in the drawings. The purpose of the drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly defined, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and the technical personnel in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution. At the same time, the various technical features in the invention can be combined interchangeably without conflicting with each other.

[0042] Example 1: Reference Figure 1 to Figure 3 A backflow prevention premixer comprises: a shell 100, a premixing chamber 110 is arranged in the shell 100, and the premixing chamber 110 comprises a contraction section 101, a throat 102 and a diffusion section 103 from back to front, and the diffusion section 103 comprises an air outlet passage; a baffle 200 is arranged in the diffusion section 103 of the premixing chamber 110, and the baffle 200 is inclined downward from back to front, and the upper end of the baffle 200 is hinged to the inner surface of the shell 100, and a shoulder is arranged in the diffusion section 103, and the shoulder is provided with an inclined table surface, and the baffle 200 has a first position and a second position, and the baffle 200 can move continuously between the first position and the second position. When the baffle 200 is in the first position, the baffle 200 abuts against the table surface and completely blocks the diffusion section 103, that is, blocks the gas outlet passage of the premixing chamber 110. When the baffle 200 moves from the first position to the second position, the opening of the gas outlet passage gradually increases. A gas channel 120 is provided in the throat 102, and the gas channel 120 is connected to the premixing chamber 110.

[0043] When in use, the anti-backflow premixer is installed in the water heater. When the water heater is not working, due to the inclined setting of the baffle 200, it always remains in the first position under its own gravity, thereby blocking the diffusion section 103, effectively preventing cold air from flowing back into the heat exchanger in the water heater and causing damage, and preventing high-temperature flue gas from flowing back into the fan and the inside of the water heater, protecting the normal use of the product, improving its service life, and greatly improving product safety. When the water heater is working, a fan is provided in the water heater. When the fan is started, a pressure difference will be generated in front and behind the premixer, and the pressure difference will cause the air to pass through the premixer from back to front. When the gas passes through the premixing chamber 110 from back to front, the premixing chamber 110 is similar to the structure of the Venturi tube. Since the gas passes through the contraction section 101, the throat 102 and the diffusion section 103 in turn, after the air and the gas pass through the throat 102 of the premixing chamber, different pressure differences and flow rate differences will be generated on the front and rear sides of the throat 102. There is a throat 102 with a smaller cross-section between the inlet and the outlet. According to the formula: gas flow Q = air flow velocity V × cross-sectional area S, the air flow velocity V2 of the throat 102 = V1 × S1 / S2, and the air flow velocity V will vary with the cross-sectional area S.

[0044] The baffle 200 automatically adjusts the heat load under the action of the fan:

[0045] See also Figure 2 as well as Figure 3 When the fan is working, it generates a forward pulling force F on the baffle. 拉 , the pulling force P decomposes into a pulling force F1; and the baffle 200 receives a downward gravity G under the action of its own weight, and the gravity G decomposes into a pressure F2, which requires the fan to suck the baffle 200 to rotate and open, F1*L>F2* L (For easy comparison, the distance from the two forces to the rotation center is the same as L), F1 = F 拉 *COSB, F2=G*SINB, G=mg, F 拉 =P 吸 *S 挡 , (where P 吸 S is the wind pressure exerted on the baffle by the fan after the fan is started. 挡 is the area of ​​the baffle).

[0046] The formula becomes: P 吸 *S 挡 *COSB>mg*SINB;

[0047] Conditions for the baffle to stop at a certain position: P 吸 *S 挡 *COSB=mg*SINB, and the amount of gas and air sucked by the fan is the size of the heat load, the gas flow rate of the mixed gas Q=μA√2gP吸 .

[0048] See also Figure 3 , the opening A of the baffle and the mixing chamber plane is proportional to the angle D between the baffle and the mixing chamber plane, B is the angle between the baffle and the vertical line, and E is the angle between the mixing chamber plane and the vertical line. B=D+E. The higher the speed of the fan, P 吸 The larger the value, the larger the opening A between the baffle and the mixing chamber plane, the larger the air flow Q of the mixed gas, and the greater the heat load.

[0049] See also Figure 1 As a further preferred embodiment, a cover plate 300 is further provided in the premixing chamber 110. The cover plate 300 is tilted downward from the back to the front. The upper end of the cover plate 300 is hinged to the inner surface of the shell 100. The cover plate 300 covers the gas channel 120 under the action of its own weight. When the baffle 200 is not opened, the gas outlet of the gas channel 120 is covered by the cover plate 300 so that it cannot discharge gas, thereby eliminating the risk of direct discharge of gas due to misoperation or failure of the gas valve and improving product safety. The cover plate 300 also uses its own gravity to block the gas channel 120. Similarly, when working, the baffle 200 and the cover plate 300 are affected by the fan of the water heater, so that the cover plate 300 can be flipped upward and opened.

[0050] Embodiment 2:

[0051] See also Figure 4 Different from the first embodiment, the gas outlet of the gas channel 120 is horizontally forward and is an inclined surface, which is coplanar with the surface of the shoulder. Therefore, when the baffle 200 is in the first position, the gas outlet abuts against the baffle 200.

[0052] In order to block the gas outlet, a cover plate is added in the first embodiment, while the position of the gas outlet is cleverly arranged in this embodiment so that the baffle 200 can block the gas outlet and the premixing chamber 110 at the same time.

[0053] Embodiment three:

[0054] See also Figure 5 In this embodiment, an elastic member 400 (such as a compression spring) is added, one end of the elastic member 400 abuts against the baffle 200 and the other end abuts against the housing 100, and the elastic member 400 forces the baffle 200 to move to the first position. Figure 5 The arrangement of the elastic member 400 shown is for illustration only.

[0055] Different from the first embodiment, the baffle 200 of the first embodiment uses its own gravity to achieve closure, while the present embodiment uses the elastic force of the elastic member 400. The premixer of the first embodiment is limited in its installation direction because it uses gravity for blocking, and must be installed vertically. However, after adding the elastic member, the installation of the premixer is more flexible, no longer restricted by gravity, and more convenient to use. The baffle 200 is acted upon by elastic force, and the baffle 200 is acted upon by the elastic force and the suction force of the fan, which can ensure that the baffle 200 has a certain sealing force to seal the mixing chamber plane and the gas outlet, but is not too large to be difficult to open, thereby improving product safety and adaptability.

[0056] Moreover, it is further preferred that a threaded member can be added to the housing, and the threaded member can be a bolt or the like. The threaded member is threadedly connected to the housing, and one end of the threaded member abuts against the compression spring. By rotating the threaded member, the threaded member moves in the housing, thereby adjusting the initial position of the threaded member, and the pre-compression force of the elastic member can be adjusted, thereby adjusting the opening force of the baffle. For example, when the threaded member moves inward, the elastic member is further compressed, and the opening force of the baffle will increase. Conversely, when the threaded member moves outward, the elastic member is released, and the baffle is easier to open.

[0057] Embodiment 4:

[0058] See also Figure 6 to Figure 8 On the basis of the premixer of the first embodiment, there are two premixing chambers 110, which are arranged side by side, and both of them are venturi tubes; the baffle 200 is arranged in both premixing chambers 110. The two premixing chambers 110 arranged side by side have gas outlets. When working, the adjustment range of the product heat load can be increased at the same fan speed, the adjustment range of the temperature can be increased, and the product comfort can be improved, especially for products with large loads. Moreover, both premixing chambers 110 are venturi tube structures, so that the air and gas are more evenly mixed.

[0059] As a further preferred embodiment, the two premixing chambers 110 are respectively a first premixing chamber 111 and a second premixing chamber 112, and the minimum cross-sectional area of ​​the first premixing chamber 111 is greater than the minimum cross-sectional area of ​​the second premixing chamber 112. The minimum cross-sectional areas of the two premixing chambers 110 are not consistent, and the sizes of the two corresponding gas outlets are also inconsistent, which can increase the adjustment range of the product heat load, increase the range of the adjustment temperature, improve the product comfort, and save more gas. Of course, in some embodiments, the minimum cross-sectional areas of the two premixing chambers are consistent, and the sizes of the two corresponding gas outlets are also consistent, which is conducive to simple production and prevents errors.

[0060] Further as a preferred embodiment, the two baffles 200 are respectively a first baffle 210 and a second baffle 220, the first baffle 210 is installed in the first premixing chamber 111, the second baffle 220 is installed in the second premixing chamber 112, and the driven force of the first baffle 210 is greater than the driven force of the second baffle 220.

[0061] The driven force is equivalent to the opening force of the baffle. Two baffles with inconsistent driven forces will have inconsistent opening degrees under the suction of the same fan speed, which can increase the adjustment range of the product's thermal load, increase the adjustment range of the temperature, and improve product comfort, especially for products with large loads.

[0062] From the above force analysis, it can be known that in order for the fan to suck the baffle to rotate and open, F 拉 *L>F 压 *L (For easy comparison, the distance from the two forces to the rotation center is the same as L), F 拉 =F 吸 *COSB, F 压 =G*SINB, G=mg, F 吸 =P 吸 *S 挡 ,

[0063] The formula becomes: P 吸 *S 挡 *COSB>mg*SINB,

[0064] The higher the fan speed, the higher the P 吸 The larger the value, when the fan speed is constant, P 吸 The value of is determined; the larger the baffle force area S is, the larger the 挡 The larger the value, the greater the value of S. 挡 The value of F is determined; the smaller the value of the acute angle B between the plane of the mixing chamber in contact with it and the vertical line, the larger the value of COSB is. The smaller the initial value of the acute angle B is, the smaller the value of F is. 拉 The larger the angle, the easier it is to turn the baffle to open. The acute angle B is the angle between the baffle and the vertical line.

[0065] On the other hand, the smaller the mass m of the baffle, the smaller the 压 The smaller the baffle is, the smaller the value of SINB is. 压 The smaller it is, the easier it is to turn the baffle open.

[0066] In the two premixing chambers 110, if the mass m of one baffle is small, or the force area S of the baffle is large, or the value of the acute angle B is small, the driving force on it is small, and it will open first while the other one will not open, thus forming segmented air intake combustion, which can improve the adjustment range of the product heat load, the adjustment range of the temperature, and the product comfort, especially for products with large loads. However, the value of the acute angle B cannot be set too small. If it is set too small, F 压 If the baffle is too small, it is easy to open. For example, if the plane of one mixing chamber is set to 20 degrees and the plane of the other mixing chamber is set to 40 degrees, SIN40 / SIN20=1.879, the gravity component force difference between the two is 2 times faster, which effectively improves the product heat load adjustment ratio.

[0067] See also Figure 7 to Figure 10-C As a further preferred embodiment, a regulating device 500 is provided in the gas channel 120 , and the regulating device 500 is used to adjust the minimum flow area of ​​the gas channel 120 .

[0068] Further as a preferred embodiment, the regulating device 500 includes a connecting portion 510 and an regulating portion 520 which are connected to each other, the connecting portion 510 is arranged on the peripheral wall of the gas channel 120 and is rotatably connected to the shell 100, the regulating portion 520 is at least partially located in the gas channel 120, and the regulating portion 520 changes the minimum flow area of ​​the gas channel 120 as the connecting portion 510 rotates.

[0069] See also Figure 7 , Fig. 9 As a further preferred embodiment, the gas channel 120 includes a first adjusting section 121 and a second adjusting section 122 connected in series, the first adjusting section 121 and the second adjusting section 122 are perpendicular to each other, the connecting portion 510 is arranged on the peripheral wall of the first adjusting section 121 and is rotatably connected to the shell 110, the adjusting portion 520 is inserted into the second adjusting section 122, and the two adjusting devices 500 arranged on the two gas channels 120 are arranged side by side.

[0070] See also Figure 8 , Fig. 9As a further preferred embodiment, the gas channel 120 is in a circular tube shape, the diameter of the first adjusting section 121 is a, the diameter of the second adjusting section 122 is b, the adjusting portion 520 is located at the connection between the first adjusting section 121 and the second adjusting section 122, the center line of the connecting portion 510 coincides with the center line of the second adjusting section 122, the adjusting portion 520 is in a block shape, the length of the adjusting portion 520 is l, the width is h, and the thickness is c, and the adjusting portion 520 is eccentrically arranged on the connecting portion 510. The adjusting portion 520 is inserted into the second adjusting section 122, wherein the thickness c of the adjusting portion 520 is smaller than the diameter b of the second adjusting section 122 and the diameter a of the first adjusting section 121, the length l of the adjusting portion 520 is larger than the diameter a of the first adjusting section 121, and the width h of the adjusting portion 520 is substantially equal to the diameter a of the first adjusting section 121.

[0071] See also Fig. 9 , Figure 10-A , at this time, the connecting portion 510 is located at the 0° position, or the first position. The regulating portion 520 defines the minimum flow area of ​​the gas channel 120 as S1;

[0072] See also Figure 10-B When the connecting portion 510 is rotated so that the connecting portion 510 is located at a 90° position, or a second position, the regulating portion 520 defines a minimum flow area of ​​the gas channel 120 as S2;

[0073] See also Figure 10-C When the connecting portion 510 is further rotated so that the connecting portion 510 is located at a position of 180°, or the third position, the regulating portion 520 limits the minimum flow area of ​​the gas channel 120 to S3.

[0074] Since the adjusting portion 520 is eccentrically arranged with respect to the connecting portion 510, when the adjusting portion 520 is in the first position and the third position, although it is relatively perpendicular to the first adjusting section 121, its position relative to the second adjusting section 122 is different, so that the minimum flow area of ​​the gas channel 120 is different. When the connecting portion 510 is in the second position, the adjusting portion 520 is relatively parallel to the first adjusting section 121, and the minimum flow area of ​​the gas channel 120 is the cross-sectional area of ​​the second adjusting section 122 minus the transverse cross-sectional area of ​​the adjusting portion 520.

[0075] It can be seen that when the connection part 510 is in three different positions, it can correspond to three different minimum flow areas of the gas channel 120. By cleverly setting the corresponding sizes, accurate adaptation of three different gas sources can be achieved, thereby improving the convenience of adjustment.

[0076] Further as a preferred embodiment, the adjusting device 500 also includes an electric adjusting part, which is used to controllably drive the connecting part 510; and / or, the adjusting device 500 also includes a manual adjusting part, which is at least partially visible outside the shell, and is used to drive the connecting part 510.

[0077] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A backflow prevention premixer, characterized in that: include: A shell (100), wherein a premixing chamber (110) is provided in the shell (100), the premixing chamber (110) is disposed through the shell (100), and the premixing chamber (110) comprises an air outlet passage; a baffle (200), the baffle (200) being connected to the housing (100), the baffle (200) having a first position and a second position, and the baffle (200) being continuously movable between the first position and the second position, the baffle (200) blocking the gas outlet passage of the premixing chamber (110) when in the first position, and when the baffle (200) moves from the first position to the second position, the opening of the gas outlet passage gradually increases; A gas channel (120), the gas channel (120) being in communication with the premixing chamber (110); There are two premixing chambers (110), the two premixing chambers (110) are arranged side by side on the left and right, and both of the two premixing chambers (110) are venturi tubes; the baffle (200) is provided in each of the two premixing chambers (110); The two premixing chambers (110) are respectively a first premixing chamber (111) and a second premixing chamber (112); the minimum cross-sectional area of ​​the first premixing chamber (111) is greater than the minimum cross-sectional area of ​​the second premixing chamber (112); The two baffles (200) are respectively a first baffle (210) and a second baffle (220); the first baffle (210) is installed in the first premixing chamber (111), and the second baffle (220) is installed in the second premixing chamber (112); when moving from the first position to the second position, the driven force of the first baffle (210) is greater than the driven force (220) of the second baffle; due to the inconsistency of the driven forces, the openings of the first baffle (210) and the second baffle (220) are inconsistent, thereby forming staged intake combustion.

2. The anti-backflow premixer according to claim 1, characterized in that: The baffle (200) blocks the gas outlet passage by its own gravity, and the shell (100) is provided with an inclined table on the peripheral wall of the premixing chamber (110); when the baffle (200) is in the first position, one end of the baffle (200) is hinged to the shell (100), and the other end is tilted downward and abuts against the table.

3. The anti-backflow premixer according to claim 1, characterized in that: One end of the baffle (200) is hinged to the shell (100), an elastic member (400) is provided between the baffle (200) and the shell (100), and the elastic member (400) applies a force to the baffle (400) to move it toward the first position.

4. The anti-backflow premixer according to claim 3, characterized in that: The elastic member (400) is a compression spring; one end of the elastic member (400) is adjustably connected to the housing (100), and the other end is in contact with the baffle (200).

5. The anti-backflow premixer according to claim 1, characterized in that: A cover plate (300) is also provided in the premixing chamber (110), the cover plate (300) being inclined downward from the back to the front, the upper end of the cover plate (300) being hinged to the inner surface of the shell (100), and the cover plate (300) covering the gas channel (120) under the action of its own weight.

6. The anti-backflow premixer according to claim 1, characterized in that: The gas channel (120) comprises a gas outlet, the gas outlet faces the air inlet direction of the premixing chamber (100), and when the baffle (200) is in the first position, the gas outlet abuts against the baffle (200).

7. The anti-backflow premixer according to claim 1, characterized in that: The gas channel (120) is provided with an adjusting device (500), and the adjusting device (500) is used to adjust the minimum flow area of ​​the gas channel (120).

8. The backflow prevention premixer according to claim 7, characterized in that: The regulating device (500) comprises a connecting portion (510) and an regulating portion (520) which are connected to each other; the connecting portion (510) is arranged on the peripheral wall of the gas passage (120) and is rotatably connected to the housing (100); the regulating portion (520) is at least partially located in the gas passage (120); and the regulating portion (520) changes the minimum flow area of ​​the gas passage (120) as the connecting portion (510) rotates.

9. The anti-backflow premixer according to claim 8, characterized in that: The gas passage (120) comprises a first adjusting section (121) and a second adjusting section (122) which are connected in series in sequence, the first adjusting section (121) and the second adjusting section (122) being perpendicular to each other, the connecting portion (510) being arranged on a peripheral wall of the first adjusting section (121) and being rotatably connected to the housing (110), and the adjusting portion (520) being inserted into the second adjusting section (122).

10. The anti-backflow premixer according to claim 9, characterized in that: The gas channel (120) is in the shape of a circular tube; the adjusting portion (520) is located at the connection between the first adjusting section (121) and the second adjusting section (122); the adjusting portion (520) is in the shape of a block; the cross-sectional area of ​​the adjusting portion (520) is adapted to the diameter of the second adjusting section (122); and the adjusting portion (520) is eccentrically arranged on the connecting portion (510).

11. The anti-backflow premixer according to claim 7, characterized in that: The adjusting device (500) further comprises an electric adjusting part, the electric adjusting part being used for driving the connecting part (510) in a controlled manner; Alternatively, the adjustment device (500) further comprises a manual adjustment portion, the manual adjustment portion at least partially appearing outside the housing, the manual adjustment portion being used to drive the connection portion (510).

12. A gas water heater, characterized in that: It comprises the anti-backflow premixer as described in any one of claims 1 to 11 above.

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