Gas-air mixing device and gas water heating device

Abstract

The utility model discloses a kind of gas air mixing device and gas water heater, it relates to water heating device field, comprising: for input gas gas passage;For input air first air passage and second air passage;With the first gas output portion and the second gas output portion of the gas passage intercommunication;Mixed gas passage is set in the first air passage, second air passage, first gas output portion, second gas output portion downstream;Flow regulating component is at least partially arranged in the first air passage and can move along the extension direction of the first air passage, air inlet in the gas air mixing device can drive the flow regulating component moves to adjust the opening of the first air passage and the first gas output portion;The second air passage and the second gas output portion are normally open state.This application can solve the problem that flow regulation range is relatively narrow.

Description

Technical Field

[0001] This utility model relates to the field of water heating devices, and in particular to a gas-air mixing device and a gas-fired hot water device. Background Technology

[0002] In gas water heaters, the gas-air mixing device is a core component. Its function is to thoroughly mix gas and air and stably deliver the mixture to the burner to ensure efficient and stable combustion. In existing technologies, some gas-air mixing devices employ a Venturi structure. This structure is based on fluid mechanics principles; when air flows through a Venturi tube, the change in tube diameter increases the air velocity and decreases the pressure, thereby using the resulting suction to draw in gas and achieve gas-air mixing. However, this Venturi structure gas-air mixing device has significant drawbacks. Its flow rate adjustment range is relatively narrow, making it difficult to simultaneously meet the adjustment needs of relatively high and relatively low power outputs. This limits the performance of the gas water heater in different usage scenarios and fails to fully adapt to diverse user needs and changing operating conditions, necessitating improvement. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a gas-air mixing device and a gas-fired hot water device, which can solve the problem of a relatively narrow flow adjustment range.

[0004] The specific technical solution of this utility model embodiment is as follows:

[0005] A gas-air mixing device, comprising:

[0006] Gas passage for inputting gas;

[0007] First and second air channels for air input;

[0008] A first gas output section and a second gas output section connected to the gas passage;

[0009] A mixed gas passage is provided downstream of the first air passage, the second air passage, the first gas output section, and the second gas output section;

[0010] A flow regulating component is at least partially disposed within the first air passage and is movable along the extension direction of the first air passage. The air intake in the gas-air mixing device can drive the flow regulating component to move in order to adjust the opening of the first air passage and the first gas output section.

[0011] The second air passage and the second gas output section are normally open.

[0012] Preferably, the first air channel and the second air channel are independently configured; it also includes an air inlet located upstream of the first air channel and the second air channel, and the air inlet is provided with an air inlet baffle that can open with the incoming air.

[0013] Preferably, when the air inlet pressure is less than the first preset pressure, the air inlet baffle opens, and air and gas are output to the mixed gas channel through the second air channel and the second gas output section, while the flow regulating component closes the first air channel and the first gas output section.

[0014] Preferably, the air inlet baffle is connected to the flow regulating component, and the air inlet baffle can move along the extension direction of the first air channel.

[0015] Preferably, the air inlet baffle is connected to the flow regulating component by a spring. When the air inlet pressure flowing into the gas-air mixing device is greater than or equal to the first preset pressure, the flow regulating component begins to move and adjust the opening of the first air passage and / or the first gas output section.

[0016] Preferably, the air inlet baffle is connected to the flow regulating component via a connecting rod, and the flow regulating component moves with the air inlet baffle.

[0017] Preferably, it further includes a housing and a connecting rod bracket fixed in the housing. The connecting rod is movably inserted into a sleeve of the connecting rod bracket. The sleeve is provided with a spring limiting part. A return spring is provided between the spring limiting part and the air inlet baffle. When the air intake of the air inlet stops, the return spring drives the air inlet baffle to close the air inlet.

[0018] Preferably, it further includes a housing, the housing comprising a first channel housing forming the first air passage, at least a portion of the flow regulating component being disposed in the first channel housing to regulate the air intake flow of the first air passage.

[0019] Preferably, the housing further includes a gas passage housing located outside the first channel housing, the gas passage being formed between the first channel housing and the gas passage housing, and the flow regulating component extending to the first gas output section to regulate the gas flow rate of the first gas output section.

[0020] Preferably, the gas passage housing extends inward to form a retaining ring, and the retaining ring and the first passage housing form the first gas output section;

[0021] The flow regulating component includes a flange extending from the first channel outlet toward the retaining ring, the flange moving with the flow regulating component to regulate the gas flow of the first gas output section.

[0022] Preferably, the housing further includes an air inlet housing disposed upstream of the first channel housing, the air inlet housing including an inlet portion extending inward from the inlet end, and the air inlet baffle can close the inlet portion.

[0023] Preferably, the air inlet housing and the first channel housing are plastic housings, and the gas channel housing is a cast aluminum housing.

[0024] Preferably, the gas passage housing has a recessed first platform at one end opposite to the gas passage outlet, and an outwardly extending boss at the air inlet end of the first passage housing, with one side of the boss and the first platform sealed together by a first sealing ring.

[0025] Preferably, the air inlet housing has a second platform at one end facing the first channel housing, and the air inlet end of the first channel housing has an outwardly extending boss. The second platform and the other side of the boss are sealed together by a second sealing ring.

[0026] Preferably, the edge of the flow regulating component matches the inner side of the first channel housing.

[0027] Preferably, when the air intake in the gas-air mixing device drives the flow regulating component to move, if the moving distance of the flow regulating component is less than a first moving distance, the first air passage and the first gas output section are in a closed state;

[0028] When the moving distance of the flow regulating component is greater than or equal to the first moving distance and less than the second moving distance, the first gas output section is opened and the first air passage is closed.

[0029] When the movement distance of the flow regulating component is greater than or equal to the second movement distance, the first air passage and the first gas output section are in the open state.

[0030] Preferably, when the inlet pressure in the gas-air mixing device is less than the first preset pressure, the moving distance of the flow regulating component is less than the first moving distance;

[0031] When the inlet air pressure in the gas-air mixing device is greater than or equal to the first preset pressure and less than the second preset pressure, the moving distance of the flow regulating component is greater than or equal to the first moving distance and less than the second moving distance.

[0032] When the intake air pressure in the gas-air mixing device is greater than or equal to the second preset pressure, the moving distance of the flow regulating component is greater than or equal to the second moving distance.

[0033] Preferably, it further includes:

[0034] The housing includes a first channel housing forming the first air passage, and at least a portion of the flow regulating component is disposed in the first channel housing to regulate the air intake flow of the first air passage;

[0035] The housing also includes a gas passage housing located outside the first channel housing, and the gas passage is formed between the first channel housing and the gas passage housing. The flow regulating component extends to the first gas output section to regulate the gas flow rate of the first gas output section.

[0036] The flow regulating component includes a first sealing portion that matches the inner side of the outlet of the first channel housing. The flow regulating component moves at least a second moving distance, and the first sealing portion separates from the outlet of the first channel housing.

[0037] The flow regulating component further includes a second sealing part that matches the inner side of the gas passage housing of the first gas output part. The flow regulating component moves at least the first moving distance, and the second sealing part separates from the inner side of the gas passage housing.

[0038] Preferably, the system further includes a housing, the housing comprising a first channel housing forming the first air passage, and a gas passage housing located outside the first channel housing, wherein the gas passage is formed between the first channel housing and the gas passage housing; the housing further includes at least one second channel housing forming the second air passage, the second channel housing being disposed between the first channel housing and the gas passage housing, and the second air passage being arranged side by side with the first air passage.

[0039] Preferably, a second gas output section is provided on the outside of the outlet of the second air passage formed by the second channel housing, and the second gas output section is disposed between the second channel housing and the gas passage housing.

[0040] Preferably, a retaining ring extends inward from the inner side of the gas passage housing, the second passage housing is connected to the retaining ring, the second air passage outlet is disposed on the retaining ring, and the second gas output part is disposed between the second passage housing and the retaining ring.

[0041] Preferably, the first air channel has a circular cross-section, and the second air channel has an arc-shaped cross-section.

[0042] A gas-fired hot water device includes any of the gas-air mixing devices described above; it also includes a fan and a fully premixed burner.

[0043] The fan outlet is connected to the air inlet, and the mixed gas passage is connected to the fully premixed burner;

[0044] Alternatively, the mixed gas passage is connected to the fan inlet, and the fan outlet is connected to the fully premixed burner.

[0045] Preferably, the fully premixed burner is located below the fan and the gas-air mixing device.

[0046] The technical solution of this utility model has the following significant beneficial effects:

[0047] 1. In this application, when the output power of the gas-fired water heater is relatively low, the gas-air mixing device can adjust the opening of the first air passage and the first gas output section to close via a flow regulating component. This ensures that the gas in the gas passage mixes with the air output from the second air passage only through the second gas output section in the mixed gas channel and is then output. When the output power of the gas-fired water heater increases, the air intake in the gas-air mixing device increases to drive the flow regulating component to move and adjust the opening of the first gas output section. The first air passage remains closed, and the gas in the gas passage mixes with the air output from the second air passage in the mixed gas channel via both the first and second gas output sections, thereby satisfying the power requirements of the gas-fired water heater. To meet the increased power demand, in the aforementioned process, the greater the increase in the output power of the gas-fired water heater, the larger the opening of the first gas output section. When the output power of the gas-air mixing device further increases, the air intake in the gas-air mixing device further increases to drive the flow regulating component to move and adjust the opening of the first gas output section. The first air passage also opens, and the gas in the gas passage passes through the first and second gas output sections respectively, mixing with the air output from the first and second air passages in the mixed gas passage before being output. This satisfies the further increase in the output power demand of the gas-fired water heater. In the aforementioned process, the greater the increase in the output power of the gas-fired water heater, the larger the opening of the first gas output section and the first air passage. This method effectively increases the flow regulation range of the gas-air mixing device, enabling it to simultaneously meet both relatively high and relatively low power output requirements.

[0048] 2. The power source driving the flow regulating component to move is the air intake in the gas-air mixing device. This eliminates the need for an additional power source, effectively simplifying the components of the gas-air mixing device and reducing its cost.

[0049] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0050] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0051] Figure 1 This is a cross-sectional view of the gas-air mixing device in the first state in an embodiment of this utility model;

[0052] Figure 2 This is a cross-sectional view of the gas-air mixing device in the second state in an embodiment of this utility model;

[0053] Figure 3 This is a cross-sectional view of the gas-air mixing device in the third state in an embodiment of this utility model;

[0054] Figure 4 This is a cross-sectional view of the gas-air mixing device in the fourth state in an embodiment of this utility model;

[0055] Figure 5 for Figure 1 A magnified view of a portion of point a;

[0056] Figure 6 for Figure 2 A magnified view of a portion at point b in the middle;

[0057] Figure 7 for Figure 3 A magnified view of a portion of point c in the middle;

[0058] Figure 8 for Figure 4 A magnified view of a portion at point d in the middle;

[0059] Figure 9 This is a cross-sectional view of the gas-air mixing device in the fourth state of this utility model from another angle;

[0060] Figure 10This is an exploded view of the gas-air mixing device in an embodiment of this utility model.

[0061] The reference numerals in the above figures are as follows:

[0062] 1. Gas passage; 2. First air passage; 3. Second air passage; 4. First gas output section; 5. Second gas output section; 6. Mixed gas passage; 7. Flow regulating component; 71. Flanged edge; 72. First sealing section; 73. Second sealing section; 8. Air inlet; 9. Air inlet baffle; 10. Connecting rod; 11. Housing; 111. First passage housing; 1111. Boss; 112. Gas passage housing; 1121. Retaining ring; 1122. First platform; 113. Air inlet housing; 1131. Inlet section; 1132. Second platform; 114. Second passage housing; 12. Connecting rod bracket; 121. Sleeve; 1211. Spring limiting section; 13. Return spring; 14. First sealing ring; 15. Second sealing ring. Detailed Implementation

[0063] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0065] To address the issue of a relatively narrow flow rate adjustment range, this application proposes a gas-air mixing device. Figure 1 This is a cross-sectional view of the gas-fired water heater in its first state according to an embodiment of the present invention. Figure 2 This is a cross-sectional view of the gas-fired water heater in the second state according to an embodiment of the present invention. Figure 3 This is a cross-sectional view of the gas-fired water heater in the third state according to an embodiment of the present invention. Figure 4 This is a cross-sectional view of the gas-fired water heater in the fourth state according to an embodiment of the present invention, as shown below. Figures 1 to 4 As shown, the gas-air mixing device may include: a gas passage 1 for inputting gas; a first air passage 2 and a second air passage 3 for inputting air; a first gas output section 4 and a second gas output section 5 connected to the gas passage 1; a mixed gas passage 6 disposed downstream of the first air passage 2, the second air passage 3, the first gas output section 4, and the second gas output section 5; and a flow regulating component 7 disposed at least partially within the first air passage 2 and movable along the extension direction of the first air passage 2, wherein the air intake in the gas-air mixing device can drive the flow regulating component 7 to move to adjust the opening degree of the first air passage 2 and the first gas output section 4; the second air passage 3 and the second gas output section 5 are normally open.

[0066] In this application, when the output power of the gas-fired water heater is relatively low, the gas-air mixing device can adjust the opening of the first air passage 2 and the first gas output section 4 to close via the flow regulating component 7. This allows the gas from gas passage 1 to mix with the air output from the second air passage 3 only through the second gas output section 5 in the mixing gas passage 6 before being output. When the output power of the gas-fired water heater increases, the air intake in the gas-air mixing device increases to drive the flow regulating component 7 to move and adjust the opening of the first gas output section 4. The first air passage 2 remains closed, and the gas from gas passage 1 mixes with the air output from the second air passage 3 in the mixing gas passage 6 via the first gas output section 4 and the second gas output section 5, thereby satisfying the output requirements of the gas-fired water heater. To meet the increased power demand, in the aforementioned process, the greater the increase in the output power of the gas-fired water heater, the larger the opening of the first gas output section 4 becomes. When the output power of the gas-air mixing device further increases, the air intake in the gas-air mixing device further increases to drive the flow regulating component 7 to move and adjust the opening of the first gas output section 4. The first air passage 2 also opens, and the gas in the gas passage 1 passes through the first gas output section 4 and the second gas output section 5, respectively, and mixes with the air output from the first air passage 2 and the second air passage 3 in the mixed gas passage 6 before being output. This satisfies the further increase in the output power demand of the gas-fired water heater. In the aforementioned process, the greater the increase in the output power of the gas-fired water heater, the larger the opening of the first gas output section 4 and the first air passage 2 becomes. This method effectively increases the flow regulation range of the gas-air mixing device, enabling it to simultaneously meet both relatively large and relatively small power output demands.

[0067] In addition, the power source for driving the flow regulating component 7 to move is the air intake in the gas-air mixing device. This eliminates the need for an additional power source, effectively simplifying the components of the gas-air mixing device and thus reducing its cost.

[0068] Alternatively, the first air passage 2 and the second air passage 3 can be independently configured. The gas-air mixing device may also include an air inlet 8 located upstream of the first air passage 2 and the second air passage 3. The air inlet 8 can communicate with both the first air passage 2 and the second air passage 3. For example, an air inlet damper 9 is provided at the air inlet 8, which can open with incoming air. When the air inlet damper 9 is opened by incoming air, the air inlet 8 is connected to both the first air passage 2 and the second air passage 3. When the air inlet damper 9 is not opened, the air inlet 8 is disconnected from both the first air passage 2 and the second air passage 3. With this structure, when the gas-fired water heater transitions from a combustion operating state to a non-combustion standby state, the air inlet 8 is closed. The residual hot flue gas in the combustion chamber cannot escape through the mixed gas passage 6, and then through the first air passage 2 and / or the second air passage 3 and the air inlet 8. This reduces the amount of heat escaping from the combustion system of the entire gas-fired water heater in the standby state, thereby reducing energy waste and improving thermal efficiency.

[0069] When the intake pressure at air inlet 8 is close to zero, such as Figure 1 and Figure 5 As shown, the air intake baffle 9 cannot be opened and is in the closed state. At this time, the air inlet 8 is disconnected from the first air passage 2 and the second air passage 3. Air cannot be output to the mixed gas passage 6 through the second air passage 3, and the flow regulating component 7 closes the first air passage 2 and the first gas output part 4.

[0070] As a feasible option, the air inlet damper 9 is connected to the flow regulating component 7, and the air inlet damper 9 can move along the extension direction of the first air passage 2. Depending on the magnitude of the air inlet pressure 8, the air inlet damper 9 moves to different degrees, which in turn drives the flow regulating component 7 to move to different degrees, thereby adjusting the different openings of the first air passage 2 and the first gas output section 4.

[0071] When the air inlet pressure of air inlet 8 is less than the first preset pressure, such as Figure 2 and Figure 6 As shown, the air inlet damper 9 is open, and air and gas are output to the mixed gas channel 6 through the second air channel 3 and the second gas output section 5. The flow regulating component 7 closes the first air channel 2 and the first gas output section 4.

[0072] Since the air inlet baffle 9 is connected to the flow regulating component 7, in one feasible embodiment, the air inlet baffle 9 and the flow regulating component 7 can be connected by a spring. When the air inlet pressure flowing into the gas-air mixing device is greater than or equal to the first preset pressure, the flow regulating component 7 begins to move and adjust the opening of the first air passage 2 and / or the first gas output section 4.

[0073] In another feasible implementation, such as Figures 1 to 4 As shown, the air inlet baffle 9 and the flow regulating component 7 are connected by a connecting rod 10, and the flow regulating component 7 moves with the air inlet baffle 9.

[0074] In both of the above methods, when the air intake drive flow regulating component 7 in the gas-air mixing device moves, such as Figure 2 and Figure 6 As shown, when the movement distance of the flow regulating component 7 is less than the first movement distance, the first air passage 2 and the first gas output section 4 are in a closed state. Correspondingly, when the air inlet pressure of the air inlet 8 is less than the first preset pressure, the movement distance of the flow regulating component 7 can be less than the first movement distance. For example, the first preset pressure can be selected as 230 Pa.

[0075] When the air intake drive flow regulating component 7 in the gas-air mixing device moves, such as Figure 3 and Figure 7 As shown, when the movement distance of the flow regulating component 7 is greater than or equal to the first movement distance and less than the second movement distance, the first gas output section 4 opens, and the first air passage 2 is closed. Correspondingly, when the inlet air pressure in the gas-air mixing device is greater than or equal to the first preset pressure and less than the second preset pressure, the movement distance of the flow regulating component 7 is greater than or equal to the first movement distance and less than the second movement distance. For example, the second preset pressure can be selected as 630 Pa.

[0076] When the air intake drive flow regulating component 7 in the gas-air mixing device moves, such as Figure 4 and Figure 8 As shown, when the movement distance of the flow regulating component 7 is greater than or equal to the second movement distance, the first air passage 2 and the first gas output section 4 are in the open state. Correspondingly, when the air inlet pressure in the gas-air mixing device is greater than or equal to the second preset pressure, the movement distance of the flow regulating component 7 is greater than or equal to the second movement distance.

[0077] In an embodiment where the air inlet baffle 9 and the flow regulating component 7 are connected by a connecting rod 10, such as Figures 1 to 4As shown, the gas-air mixing device may include a housing 11 and a connecting rod bracket 12 fixed inside the housing 11. The connecting rod 10 is movably inserted into the sleeve 121 of the connecting rod bracket 12. The sleeve 121 is provided with a spring limiting part 1211, and a return spring 13 is provided between the spring limiting part 1211 and the air inlet baffle 9. When the air intake of the air inlet 8 stops, the return spring 13 drives the air inlet baffle 9 to close the air inlet 8. When the air intake pressure of the air inlet 8 decreases, the return spring 13 drives the air inlet baffle 9 to move toward the air inlet 8. At this time, the first air passage 2 and the first gas output part 4 are in the open state, which can change to the first gas output part 4 being open and the first air passage 2 being closed, and / or the first gas output part 4 being open and the first air passage 2 being closed, and / or the air inlet 8 then changes from open to closed.

[0078] As a feasible option, such as Figures 1 to 4 As shown, the housing 11 may include a first channel housing 111 forming a first air passage 2. At least a portion of the flow regulating component 7 is disposed in the first channel housing 111 to regulate the air intake flow of the first air passage 2. The first air passage 2 can communicate with the air inlet 8, and when the air inlet damper 9 is closed, the first air passage 2 is disconnected from the air inlet 8.

[0079] Furthermore, such as Figures 1 to 4 As shown, the housing 11 may include a gas passage housing 112 located outside the first passage housing 111. The gas passage housing 112 can be installed in conjunction with the first passage housing 111. The gas passage housing 112 is located circumferentially outside the first passage housing 111, and the gas passage housing 112 completely surrounds the first passage housing 111 circumferentially. At least a partial gas passage 1 is formed between the first passage housing 111 and the gas passage housing 112, and the flow regulating member 7 extends to the first gas output section 4 to regulate the gas flow rate of the first gas output section 4.

[0080] In one feasible implementation, such as Figures 1 to 8 As shown, the gas passage housing 112 extends inward to form a retaining ring 1121, and a first gas output section 4 is formed between the retaining ring 1121 and the first passage housing 111. The flow regulating component 7 includes a flange 71 extending from the first passage outlet toward the retaining ring 1121. The flange 71 can seal the first gas output section 4. When the outer sidewall of the flange 71 abuts against the inner sidewall of the retaining ring 1121, the first gas output section 4 cannot output to the mixed gas passage 6.

[0081] In other words, the flow regulating component 7 may include a second sealing portion 73 that matches the inner side of the gas passage housing 112 of the first gas output unit 4. The flow regulating component 7 moves at least a first moving distance, and the second sealing portion 73 separates from the inner side of the gas passage housing 112. The second seal may include a flange 71.

[0082] The flange 71 can move with the flow regulating component 7, and the degree of movement can open the first gas output section 4 and adjust the gas flow rate of the first gas output section 4. The greater the degree of movement of the flow regulating component 7, the greater the gas flow rate of the first gas output section 4.

[0083] like Figures 1 to 8 As shown, the edge of the flow regulating component 7 can mate with the inner side of the first channel housing 111, thereby closing the first air passage 2 formed by the first channel housing 111. When the edge of the flow regulating component 7 is in contact with the inner side of the first channel housing 111, the first air passage 2 formed by the first channel housing 111 is closed. When the flow regulating component 7 moves and the moving distance is greater than or equal to a second moving distance, the first air passage 2 formed by the first channel housing 111 is opened. That is, the flow regulating component 7 includes a first sealing part 72 that mates with the inner side of the outlet of the first channel housing 111, and the first sealing part 72 may include the edge of the flow regulating component 7. When the flow regulating component 7 moves and the moving distance is greater than or equal to the second moving distance, the first sealing part 72 separates from the outlet of the first channel housing 111, and the first air passage 2 is opened.

[0084] like Figures 1 to 4 As shown, the housing may include an air inlet housing 113 disposed upstream of the first channel housing 111. Specifically, upstream of the first channel housing 111 refers to the upstream of the first air channel 2 of the first channel housing 111. The air inlet housing 113 includes an inlet portion 1131 extending inward from the inlet end, and an air inlet baffle 9 can close the inlet portion 1131. When the air inlet baffle 9 moves upward under the action of the return spring 13, the inlet portion 1131 can abut against the air inlet baffle 9 to limit the air inlet baffle 9, while simultaneously closing the inlet portion 1131.

[0085] To ensure the airtightness of the gas passage housing 112 and the first passage housing 111 during mating, and to prevent gas leakage and accidents, such as Figures 1 to 4 As shown, the gas passage housing 112 has a recessed first platform 1122 at one end opposite to the outlet of the gas passage 1, and the air inlet end of the first passage housing 111 has an outwardly extending boss 1111. One side of the boss 1111 and the first platform 1122 are sealed together by a first sealing ring 14.

[0086] like Figures 1 to 4As shown, the air inlet housing 113 can be directly connected to the first channel housing 111. For example, the air inlet housing 113 and the gas channel housing 112 clamp at least part of the first channel housing 111, and then the three are fixed together by using fixing screws. To ensure the airtightness of the air inlet housing 113 and the first channel housing 111 during the fit, the end of the air inlet housing 113 facing the first channel housing 111 is provided with a second platform 1132, and the second platform 1132 and the other side of the boss 1111 are sealed together by a second sealing ring 15.

[0087] In one specific embodiment, the air inlet housing 113 and the first channel housing 111 are preferably plastic housings to reduce costs. To ensure safety, the gas channel housing 112 is preferably a metal housing; furthermore, to reduce costs and facilitate manufacturing, a cast aluminum housing can be selected.

[0088] As a feasible option, such as Figures 1 to 4 As shown, the housing may include at least one second channel housing 114 forming the second air passage 3. The second channel housing 114 may be disposed between the first channel housing 111 and the gas passage housing 112, with the second air passage 3 arranged side by side with the first air passage 2. For example, both extend in a horizontal direction. The second air passage 3 may be located in the circumferential direction of the first air passage 2.

[0089] Furthermore, such as Figure 2 As shown, a second gas output section 5 is provided on the outside of the outlet of the second air passage 3 formed by the second channel housing 114. The second gas output section 5 is located between the second channel housing 114 and the gas passage housing 112. Air flows in from the air inlet 8, passes through the second air passage 3, and enters the mixed gas passage 6. During this period, the gas input from the gas passage 1 is ejected after passing through the second gas output section 5 and / or output to the second air passage 3 or the mixed gas passage 6 under the pressure of the gas. Air and gas can be mixed in the second air passage 3 or the mixed gas passage 6 to form a mixed gas.

[0090] Since the gas passage housing 112 extends inward to form a retaining ring 1121, such as Figure 2 As shown, the second channel housing 114 can be connected to the retaining ring 1121. The outlet of the second air channel 3 can be located on the retaining ring 1121. This allows the second air channel 3 to pass through the retaining ring 1121, avoiding obstruction and thus connecting with the mixed gas channel 6. The second gas output section 5 can be located between the second channel housing 114 and the retaining ring 1121.

[0091] As a feasible option, such as Figures 1 to 4As shown, an airflow channel is formed within the air inlet housing 113, and the air inlet 8 is connected to the first air passage 2 and the second air passage 3 through the airflow channel. The radial cross-sectional area of ​​the airflow channel and the radial cross-sectional area of ​​the mixed gas passage 6 are larger than the cross-sectional area of ​​the second air passage 3. The airflow channel, the second air passage 3, and the mixed gas passage 6 form a Venturi structure. The airflow channel can act as a converging tube, the second air passage 3 can act as a throat, and the mixed gas passage 6 can act as a diverging tube. The second gas output section 5 is connected to the throat of the Venturi structure, such as at the second air passage 3 or near the outlet of the second air passage 3. Through the above structure, when air flows through the second air passage 3, a negative pressure area is generated inside the second air passage 3 or near the outlet of the second air passage 3. At this time, the gas in the second gas output section 5 can be automatically drawn into the second air passage 3 or near the outlet of the second air passage 3, thereby mixing with the air to form a mixed gas, which then enters the mixed gas passage 6.

[0092] When the movement distance of the flow regulating component 7 is greater than or equal to the first movement distance and less than the second movement distance, the first gas output section 4 is open, and the first air passage 2 is closed. The first gas output section 4 is connected to the throat of the venturi structure, such as near the outlet of the second air passage 3. When air flows through the second air passage 3, a negative pressure area is generated near the outlet of the second air passage 3. This area can automatically draw gas from the second gas output section 5 into the second air passage 3 or near its outlet, and can also automatically draw gas from the first gas output section 4 into the vicinity of the outlet of the second air passage 3. Air can mix with the gas ejected from the second gas output section 5 and the gas ejected from the first gas output section 4 to form a mixed gas; alternatively, air can first mix with the gas ejected from the second gas output section 5 to form a mixed gas, and then the mixed gas can be further mixed with the gas ejected from the first gas output section 4 in the mixed gas passage 6 to form a secondary mixed gas; finally, the mixed gas or the secondary mixed gas is output from the outlet of the mixed gas passage 6.

[0093] Similarly, such as Figures 1 to 8As shown, when the flow regulating component 7 moves to open both the first air passage 2 and the first gas output section 4, the airflow cross-sectional area at the local position where the flow regulating component 7 opens the first air passage 2 is relatively small, while the airflow cross-sectional area at the remaining positions of the first air passage 2 upstream is relatively large. The first air passage 2 and the mixed gas passage 6 form a Venturi structure. The remaining positions of the upstream first air passage 2 can act as a converging tube, while the local position where the flow regulating component 7 opens the first air passage 2 can act as a throat. The mixed gas passage 6 can form a diverging tube. The first gas output section 4 is connected to the throat of the Venturi structure, such as at or near the local position where the flow regulating component 7 opens the first air passage 2. With the above structure, when air flows through the first air passage 2, a negative pressure area is generated at the local position where the flow regulating component 7 opens the first air passage 2. At this time, the gas in the first gas output section 4 can be automatically drawn into the first air passage 2 or the mixed gas passage 6, thereby mixing with the air in the first air passage 2 or the mixed gas passage 6 to form a mixed gas, which is then output through the mixed gas passage 6. In this embodiment, the air flowing through the second air passage 3 mixes with the gas output from the second gas output unit 5 to form mixed gas A, and the air flowing through the first air passage 2 mixes with the gas output from the first gas output unit 4 to form mixed gas B. Afterwards, mixed gas A and mixed gas B are mixed a second time to form mixed gas C, which flows out from the mixed gas passage 6. Alternatively, mixed gas A and mixed gas B can be mixed a second time in the mixed gas passage 6 to form mixed gas C. In this embodiment, when air flows through the second air passage 3, a negative pressure region is generated within the second air passage 3 or near its outlet. This negative pressure region can further draw out the air from the first air passage 2, exerting a certain ejection effect on the air in the first air passage 2. Of course, this negative pressure region can also draw out the gas from the first gas output unit 4, also exerting a certain ejection effect on the gas in the first gas output unit 4.

[0094] Since the second air passage 3 can be located in the circumferential direction of the first air passage 2, therefore, Figure 9 This is a cross-sectional view of the gas-air mixing device in the fourth state of this utility model from another angle. Figure 10 This is an exploded view of the gas-air mixing device in an embodiment of this utility model, as shown below. Figure 9 and Figure 10 As shown, the cross-section of the first air passage 2 can be circular, and the cross-section of the second air passage 3 can be arc-shaped. This design allows for a more compact design of the first air passage 2 and the second air passage 3. Furthermore, it allows for maximizing the cross-sectional area of ​​the first air passage 2 and the second air passage 3 within the limited volume of the gas-air mixing device, thus ensuring sufficient airflow.

[0095] This application also proposes a gas-fired water heating device, including any of the aforementioned gas-air mixing devices. Further, the gas-fired water heating device may also include a fan and a fully premixed burner. In one feasible embodiment, the fan outlet is connected to an air inlet 8 to supply air to the gas-air mixing device, and a mixed gas passage 6 is connected to the fully premixed burner to supply a mixture of air and gas to the fully premixed burner. In another feasible embodiment, the mixed gas passage 6 is connected to a fan inlet, and the fan outlet is connected to the fully premixed burner. The fan generates suction to cause the gas-air mixing device to form a mixed gas, which is then transported to the fully premixed burner.

[0096] In a preferred embodiment, the fully premixed burner can be located below the fan and the gas-air mixing device. In this way, when the gas-fired water heater transitions from a combustion operating state to a non-combustion standby state, the air inlet 8 is closed. The residual hot flue gas in the combustion chamber cannot flow upwards due to its density and instead escapes through the mixed gas channel 6, the first air channel 2, and / or the second air channel 3, and the air inlet 8. This reduces the amount of heat escaping from the combustion system of the entire gas-fired water heater during standby, thereby reducing energy waste.

[0097] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0098] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A gas-air mixing device, characterized in that, include: Gas passage for inputting gas; First and second air channels for air input; A first gas output section and a second gas output section connected to the gas passage; A mixed gas passage is provided downstream of the first air passage, the second air passage, the first gas output section, and the second gas output section; A flow regulating component is at least partially disposed within the first air passage and is movable along the extension direction of the first air passage. The air intake in the gas-air mixing device can drive the flow regulating component to move in order to adjust the opening of the first air passage and the first gas output section. The second air passage and the second gas output section are normally open.

2. The gas-air mixing device according to claim 1, characterized in that, The first air channel and the second air channel are independently configured; it also includes an air inlet located upstream of the first air channel and the second air channel, and the air inlet is provided with an air inlet baffle that can open with the incoming air.

3. The gas-air mixing device according to claim 2, characterized in that, When the air inlet pressure is less than the first preset pressure, the air inlet damper opens, and air and gas are output to the mixed gas channel through the second air channel and the second gas output section. The flow regulating component closes the first air channel and the first gas output section.

4. The gas-air mixing device according to claim 2, characterized in that, The air inlet baffle is connected to the flow regulating component, and the air inlet baffle can move along the extension direction of the first air channel.

5. The gas-air mixing device according to claim 4, characterized in that, The air inlet baffle is connected to the flow regulating component by a spring. When the air inlet pressure flowing into the gas-air mixing device is greater than or equal to the first preset pressure, the flow regulating component starts to move and adjusts the opening of the first air passage and / or the first gas output section.

6. The gas-air mixing device according to claim 4, characterized in that, The air inlet baffle is connected to the flow regulating component via a connecting rod, and the flow regulating component moves with the air inlet baffle.

7. The gas-air mixing device according to claim 6, characterized in that, It also includes a housing and a connecting rod bracket fixed in the housing. The connecting rod is movably inserted into the sleeve of the connecting rod bracket. The sleeve is provided with a spring limiting part. A return spring is provided between the spring limiting part and the air inlet baffle. When the air intake of the air inlet stops, the return spring drives the air inlet baffle to close the air inlet.

8. The gas-air mixing device according to claim 1, characterized in that, It also includes a housing, the housing comprising a first channel housing forming the first air passage, at least a portion of the flow regulating component being disposed in the first channel housing to regulate the air intake flow of the first air passage.

9. The gas-air mixing device according to claim 8, characterized in that, The housing also includes a gas passage housing located outside the first channel housing, and the gas passage is formed between the first channel housing and the gas passage housing. The flow regulating component extends to the first gas output section to regulate the gas flow of the first gas output section.

10. The gas-air mixing device according to claim 9, characterized in that, The gas passage housing extends inward to form a retaining ring, and the first gas output section is formed between the retaining ring and the first passage housing. The flow regulating component includes a flange extending from the first channel outlet toward the retaining ring, the flange moving with the flow regulating component to regulate the gas flow of the first gas output section.

11. The gas-air mixing device according to claim 9, characterized in that, The housing also includes an air inlet housing disposed upstream of the first channel housing, the air inlet housing including an inlet portion extending inward from the inlet end, and the air inlet baffle can close the inlet portion.

12. The gas-air mixing device according to claim 11, characterized in that, The air inlet housing and the first channel housing are plastic housings, while the gas channel housing is a cast aluminum housing.

13. The gas-air mixing device according to claim 11, characterized in that, The gas passage housing has a recessed first platform at one end opposite to the gas passage outlet, and an outwardly extending boss at the air inlet end of the first passage housing. One side of the boss is sealed to the first platform by a first sealing ring.

14. The gas-air mixing device according to claim 11, characterized in that, The air inlet housing has a second platform at one end facing the first channel housing, and the air inlet end of the first channel housing has an outwardly extending boss. The second platform and the other side of the boss are sealed together by a second sealing ring.

15. The gas-air mixing device according to claim 8, characterized in that, The edge of the flow regulating component matches the inner side of the first channel housing.

16. The gas-air mixing device according to claim 1, characterized in that, When the air intake in the gas-air mixing device drives the flow regulating component to move, if the moving distance of the flow regulating component is less than a first moving distance, the first air passage and the first gas output section are in a closed state. When the moving distance of the flow regulating component is greater than or equal to the first moving distance and less than the second moving distance, the first gas output section is opened and the first air passage is closed. When the movement distance of the flow regulating component is greater than or equal to the second movement distance, the first air passage and the first gas output section are in the open state.

17. The gas-air mixing device according to claim 16, characterized in that, When the inlet pressure in the gas-air mixing device is less than the first preset pressure, the moving distance of the flow regulating component is less than the first moving distance; When the inlet air pressure in the gas-air mixing device is greater than or equal to the first preset pressure and less than the second preset pressure, the moving distance of the flow regulating component is greater than or equal to the first moving distance and less than the second moving distance. When the intake air pressure in the gas-air mixing device is greater than or equal to the second preset pressure, the moving distance of the flow regulating component is greater than or equal to the second moving distance.

18. The gas-air mixing device according to claim 16, characterized in that, Also includes: The housing includes a first channel housing forming the first air passage, and at least a portion of the flow regulating component is disposed in the first channel housing to regulate the air intake flow of the first air passage; The housing also includes a gas passage housing located outside the first channel housing, and the gas passage is formed between the first channel housing and the gas passage housing. The flow regulating component extends to the first gas output section to regulate the gas flow rate of the first gas output section. The flow regulating component includes a first sealing portion that matches the inner side of the outlet of the first channel housing. The flow regulating component moves at least a second moving distance, and the first sealing portion separates from the outlet of the first channel housing. The flow regulating component further includes a second sealing part that matches the inner side of the gas passage housing of the first gas output part. The flow regulating component moves at least the first moving distance, and the second sealing part separates from the inner side of the gas passage housing.

19. The gas-air mixing device according to claim 1, characterized in that, It also includes a housing, the housing comprising a first channel housing forming the first air passage, and a gas passage housing located outside the first channel housing, the gas passage being formed between the first channel housing and the gas passage housing; the housing also includes at least one second channel housing forming the second air passage, the second channel housing being disposed between the first channel housing and the gas passage housing, the second air passage being arranged side by side with the first air passage.

20. The gas-air mixing device according to claim 19, characterized in that, The second gas output section is provided on the outside of the outlet of the second air passage formed by the second channel housing, and the second gas output section is disposed between the second channel housing and the gas passage housing.

21. The gas-air mixing device according to claim 20, characterized in that, The gas passage housing extends inward to form a retaining ring, the second passage housing is connected to the retaining ring, the second air passage outlet is disposed on the retaining ring, and the second gas output part is disposed between the second passage housing and the retaining ring.

22. The gas-air mixing device according to claim 19, characterized in that, The first air passage has a circular cross-section, and the second air passage has an arc-shaped cross-section.

23. A gas-fired hot water device, characterized in that, It includes the gas-air mixing device according to any one of claims 1 to 20; it also includes a fan and a fully premixed burner; The fan outlet is connected to the air inlet, and the mixed gas passage is connected to the fully premixed burner; Alternatively, the mixed gas passage is connected to the fan inlet, and the fan outlet is connected to the fully premixed burner.

24. The gas-fired hot water device according to claim 23, characterized in that, The fully premixed burner is located below the fan and the gas-air mixing device.

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