Nozzles, gas distribution devices, burners and gas water heaters

Abstract

The present invention discloses a nozzle, a gas distribution device, a burner and a gas water heater, wherein the nozzle comprises a nozzle body and a movable part, the nozzle body has an air inlet, a jet outlet and a jet channel connecting the air inlet and the jet outlet; the movable part is movably arranged in the jet channel to adjust the gas flow rate ejected from the jet channel to the jet outlet. The present invention proposes a nozzle with adjustable flow area, when the gas water heater performs high-temperature air combustion under different loads, the jet velocity ejected from the nozzle can be adaptively adjusted, so as to realize high-temperature air combustion in the full load section and reduce CO and NOx emissions.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature air combustion, and in particular to a nozzle, a gas distribution device, a burner and a gas water heater. Background Art

[0002] High Temperature Air Combustion is called "mild and deep low oxygen dilution combustion", or gentle combustion for short. It is a new type of combustion method, also known as high temperature air combustion. The main characteristics of this combustion are: the chemical reaction mainly occurs in a high temperature and low oxygen environment, the reactant temperature is higher than its auto-ignition temperature, and the maximum temperature rise during the combustion process is lower than its auto-ignition temperature, and the oxygen volume fraction is diluted by the combustion products to an extremely low concentration, usually 3%~10%. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is suppressed, the flame thickness becomes thicker, and the flame front disappears, so that the temperature of the entire furnace is very uniform during this combustion, and the pollutant NO x and CO emissions are significantly reduced.

[0003] Although high-temperature air combustion has many advantages as mentioned above, its application in gas water heaters is currently in the exploratory stage, and is usually achieved by using the existing structure of gas water heaters. For example, the gas is directly sprayed into the furnace by applying the existing burner nozzle. The nozzle of the existing burner is mainly implemented by fire grate and metal fiber mesh (or porous ceramic plate). After application, the jet velocity of the sprayed gas and / or air flow is too large or too small. If the jet velocity is too large, it is easy to cause the jet to hit the wall and the wall temperature is too high. If the jet velocity is too small, it will cause insufficient entrainment, resulting in poor uniformity of mixing of gas and / or air with the flue gas in the furnace, resulting in uneven combustion in the furnace, and even failure to achieve high-temperature air combustion. Summary of the invention

[0004] The main purpose of the present invention is to provide a nozzle, a gas distribution device, a burner and a gas water heater, aiming to achieve adjustable jet velocity of the nozzle so that the burner can perform high-temperature air combustion in the full load section and reduce CO and NOx emissions.

[0005] To achieve the above object, the present invention provides a nozzle for a gas water heater, the nozzle comprising:

[0006] a nozzle body, the nozzle body having an air inlet, an injection outlet, and an injection channel connecting the air inlet and the injection outlet; and

[0007] A movable part is movably arranged in the injection channel to adjust the flow rate of the gas injected through the injection channel to the injection outlet.

[0008] In one embodiment, the movable member changes the gas flow area of ​​the injection channel by moving in the injection channel, so as to adjust the flow rate of the gas injected through the injection channel to the injection outlet.

[0009] In one embodiment, the movable member comprises:

[0010] A push rod, the push rod having a first end and a second end opposite to each other, the first end of the push rod being inserted into the injection channel from outside the injection channel; and

[0011] An adjusting head, disposed in the injection channel and connected to the first end of the push rod;

[0012] The push rod moves back and forth along the first direction, driving the regulating head to switch back and forth between the first position and the second position, so as to change the gas flow area of ​​the injection channel.

[0013] In one embodiment, the injection channel includes an air intake section and an injection section, the air intake section and the injection section are connected to the air intake port and the injection outlet in sequence, and the regulating head is movably disposed in the injection section;

[0014] When the regulating head switches from the first position to the second position, the gas flow area of ​​the injection section is controlled to decrease. When the regulating head switches from the second position to the first position, the gas flow area of ​​the injection section is controlled to increase.

[0015] In one embodiment, the radial cross-sectional area of ​​the injection section decreases from the air inlet section to the injection outlet;

[0016] The shape of the regulating head is adapted to the shape of the injection section, the axis of the regulating head coincides with the axis of the injection section, and a variable flow channel is formed between the peripheral wall of the regulating head and the injection section of the injection channel;

[0017] When the regulating head switches from the first position to the second position, the gas flow area of ​​the variable flow channel decreases, so that the gas flow area of ​​the injection section decreases. When the regulating head switches from the second position to the first position, the gas flow area of ​​the variable flow channel increases, so that the gas flow area of ​​the injection section increases.

[0018] In one embodiment, the adjusting head is configured in a cone or frustum shape.

[0019] In one embodiment, when the regulating head is in the first position, at least part of it is in the injection section;

[0020] When the regulating head is in the second position, the regulating head seals the variable flow channel.

[0021] In one embodiment, a limiting portion is provided at the second end of the push rod, and when the adjusting head is in the second position, the limiting portion abuts against a peripheral wall of the nozzle body to limit the push rod from continuing to move in the first direction.

[0022] In one embodiment, a grip is provided at the second end of the push rod for manually controlling the push rod to move back and forth along the first direction.

[0023] In one embodiment, a mounting hole is provided on the peripheral wall of the nozzle body, a guide bearing is provided in the mounting hole, and the first end of the push rod is inserted into the injection channel through the guide bearing.

[0024] In order to achieve the above object, the present invention further provides a gas distribution device, the gas distribution device comprising:

[0025] a nozzle, the nozzle being a nozzle as described above; and

[0026] A driving member is drivingly connected to the movable member of the nozzle so as to drive the movable member to adjust the flow rate of the gas ejected through the ejection channel to the ejection outlet.

[0027] In one embodiment, the gas distribution device further comprises:

[0028] A controller is electrically connected to the driving member to control the driving member to work according to a load signal so as to adjust the flow rate of the gas ejected from the ejection channel to the ejection outlet.

[0029] In order to achieve the above object, the present invention further provides a burner for a gas water heater, the burner comprising:

[0030] a combustion body having a combustion chamber formed therein; and

[0031] A gas distribution device, installed on the combustion body, the gas distribution device is the gas distribution device as described above;

[0032] Wherein, a plurality of the nozzles are arranged on the combustion body and are arranged in a circle along the first circumferential direction of the combustion chamber, and the injection outlets of the plurality of the nozzles are located in the combustion chamber. The plurality of the nozzles are used to inject gas and / or air into the combustion chamber and form a swirl flow along the first circumferential direction in the combustion chamber, so that high-temperature air combustion occurs in the combustion chamber;

[0033] Wherein, the nozzle comprises:

[0034] a nozzle body, the nozzle body having an air inlet, an injection outlet, and an injection channel connecting the air inlet and the injection outlet; and

[0035] A movable part is movably arranged in the injection channel to adjust the flow rate of the gas injected through the injection channel to the injection outlet.

[0036] In one embodiment, the combustion body comprises:

[0037] A plurality of side plates, wherein the plurality of side plates enclose a rectangular combustion chamber, and the plurality of nozzles are disposed on the plurality of side plates; and

[0038] An air intake assembly is installed on the side plate. The air intake assembly is formed with an air intake cavity. The air intake cavity is used to connect to an external air source. The air intake ports of the plurality of nozzles are connected to the air intake cavity.

[0039] In one embodiment, the plurality of nozzles are evenly spaced apart on the two side plates of the combustion body that are oppositely disposed along the width direction, and are staggered in the length direction of the combustion body.

[0040] In order to achieve the above object, the present invention further provides a gas water heater, the gas water heater comprising:

[0041] A main body, wherein a heat exchange chamber and a smoke exhaust port communicated with the heat exchange chamber are arranged in the main body;

[0042] A heat exchanger is disposed in the heat exchange chamber;

[0043] a preheater, mounted on the main body, for preheating the mixed gas to a target temperature before delivering it to the combustion chamber; and

[0044] A burner, wherein the burner is the burner as described above, the burner is mounted on the main body, and the smoke outlet of the burner is connected to the heat exchange chamber;

[0045] Wherein, the fuel gas and / or air is sprayed into the combustion chamber at a preset jet velocity through the nozzle, so that a high-temperature air combustion reaction occurs in the combustion chamber;

[0046] The burner comprises:

[0047] a combustion body having a combustion chamber formed therein; and

[0048] Multiple nozzles, all of which are the nozzles described above, are penetrated on the combustion body and arranged along the first circumference of the combustion chamber, the injection outlets of the multiple nozzles are located in the combustion chamber, and the multiple nozzles are used to inject gas and / or air into the combustion chamber and form a swirl flow along the first circumference in the combustion chamber to enable high-temperature air combustion to occur in the combustion chamber.

[0049] In the technical solution of the present invention, since the nozzle includes a nozzle body and a movable part, the nozzle body has an air inlet, an injection outlet and an injection channel connecting the air inlet and the injection outlet, and the movable part is movably arranged in the injection channel to adjust the gas flow rate ejected from the injection channel to the injection outlet, so that when the gas water heater performs high-temperature air combustion under different loads, the jet velocity ejected from the nozzle can be adaptively adjusted, thereby realizing high-temperature air combustion of the burner in the full load section and reducing CO and NOx emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0051] Figure 1 It is a structural schematic diagram of an embodiment of a nozzle of the present invention;

[0052] Figure 2 It is a structural schematic diagram of an embodiment of a gas distribution device of the present invention;

[0053] Figure 3 It is a schematic structural diagram of a burner according to an embodiment of the present invention.

[0054] Description of Figure Numbers:

[0055]

[0056] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0059] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0060] In some exemplary technologies, the existing burner nozzle is directly applied to spray gas into the furnace. The burner nozzle is mainly realized by a fire grate and a metal fiber mesh (or a porous ceramic plate). After application, the jet velocity of the sprayed gas and / or air flow may be too large or too small. If the jet velocity is too large, it may easily cause the jet to hit the wall and the wall temperature to be too high. If the jet velocity is too small, it may lead to insufficient entrainment, resulting in poor uniformity of mixing of the gas and / or air with the flue gas in the furnace, resulting in uneven combustion in the furnace and even failure to achieve high-temperature air combustion.

[0061] The present invention proposes a gas water heater and a burner suitable for the gas water heater. Of course, the burner can also be applied to other water heaters or related equipment, such as gas wall-mounted boilers and other related products and equipment that use gas combustion to generate high-temperature hot water for family bathing and heating, etc. For ease of understanding, the following application to a gas water heater is taken as an example.

[0062] In one embodiment, the gas water heater includes a main body, a heat exchanger, a preheater and a burner (such as Figure 3 As shown in the figure, a heat exchange chamber and a smoke exhaust port connected to the heat exchange chamber are provided in the main body, a heat exchanger is provided in the heat exchange chamber, a preheater is installed on the main body, the preheater is used to ignite the mixed gas and transport it to the combustion chamber 20a of the burner, and preheat the combustion chamber 20a to the target temperature, the burner is installed on the main body, the smoke outlet of the burner is connected to the heat exchange chamber, the burner sprays gas and / or air to the combustion chamber 20a through the nozzle 10, so that a high-temperature air combustion reaction is carried out in the combustion chamber 20a.

[0063] The main characteristics of high-temperature air combustion are: the chemical reaction mainly occurs in a high-temperature, low-oxygen environment, the reactant temperature is higher than its auto-ignition temperature, and the maximum temperature rise during the combustion process is lower than its auto-ignition temperature, and the oxygen volume fraction is diluted to an extremely low concentration by the combustion products. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is suppressed, the flame thickness becomes thicker, and the flame front disappears, so that the temperature in the entire furnace is very uniform, the peak combustion temperature is low and the noise is extremely low, and the pollutant NOx and CO emissions are greatly reduced. However, achieving high-temperature air combustion requires certain conditions: it is necessary to ensure that the oxygen concentration at any position in the furnace is lower than a certain value, generally lower than 3%~10%, to ensure that the gas is fully combusted and burned evenly, and the temperature must be higher than the auto-ignition point of the fuel to maintain auto-ignition.

[0064] It should be noted that, since the preheater ignites and burns the mixed gas containing gas and air, high-temperature preheated air is achieved, and then the gas is sprayed through the gas injection pipe to produce an entrainment effect, so that the high-temperature flue gas refluxes, on the one hand, heat preservation is achieved so that the temperature is higher than the auto-ignition point of the fuel, so that the gas in the combustion chamber 20a can self-ignite, and on the other hand, the air is diluted by jet entrainment, so that the oxygen concentration is lower than a certain value, and uniform combustion is achieved, so that high-temperature air combustion occurs in the combustion chamber 20a. In other words, the technical solution of this embodiment is conducive to achieving these two conditions at the same time, and smoothly achieving high-temperature air combustion.

[0065] Reference Figure 3 In one embodiment, the burner proposed by the present invention includes a plurality of nozzles 10 and a combustion body 20, a combustion chamber 20a is formed in the combustion body 20, a plurality of nozzles 10 are arranged on the combustion body 20, and are arranged along the first circumference of the combustion chamber 20a, and the injection outlets 100b of the plurality of nozzles 10 are located in the combustion chamber 20a, and the plurality of nozzles 10 are used to inject gas and / or air into the combustion chamber 20a, and form a swirl flow along the first circumference in the combustion chamber 20a. It should be noted that the plurality of nozzles 10 can be installed at an angle in the combustion chamber 20a, and of course, the nozzles 10 themselves can also be improved to achieve swirl flow.

[0066] In order to enhance the mixing of the fuel gas and / or air injected by the nozzle 10 and the preheated flue gas, the residence time of the gas in the combustion chamber 20a is increased so that the fuel burns fully. In one embodiment, referring to Figure 3 The combustion body 20 may include a plurality of side plates 21 , the plurality of side plates 21 enclose a combustion chamber 20 a in a rectangular parallelepiped shape, and the plurality of nozzles 10 are disposed on the plurality of side plates 21 .

[0067] The kinetic energy of the gas ejected by the nozzles 10 on the two side plates 21 opposite to the combustion chamber 20a can be set to be the same, and the kinetic energy of the gas ejected by the nozzles 10 on the two side plates 21 adjacent to the combustion chamber 20a can be set to be different, so as to enhance the mixing of the fuel gas and / or air ejected by the nozzles 10 with the preheated flue gas, which is beneficial to the combustion of the fuel, thereby reducing the height of the burner, and is also beneficial to reducing CO and NOx emissions, and can also reduce the noise generated by the combustion of the burner. Of course, in some embodiments, the nozzles 10 can also be set only on the two side plates 21 opposite to the combustion chamber 20a, and the nozzles 10 may not be installed on the side plates 21 on the other two sides, which is not limited here.

[0068] In addition, in some embodiments, reference Figure 3 A plurality of nozzles 10 may be evenly spaced on two side plates 21 of the combustion body 20 that are oppositely disposed along the width direction, and may be staggered in the length direction of the combustion body 20 to enhance mixing of the gas and / or air ejected by the nozzles 10 with the preheated flue gas.

[0069] Further, refer to Figure 3 The combustion body 20 may further include an air intake assembly 22, which is mounted on the side plate 21. The air intake assembly 22 forms an air intake cavity, which is used to connect to an external gas source, and the air intake ports 100a of the multiple nozzles 10 are connected to the air intake cavity. In this embodiment, only one set of air intake assemblies 22 is required to be arranged on the side plate 21 on each side of the combustion chamber 20a to connect the multiple nozzles 10 thereon, and it is not necessary to arrange multiple air intake pipes to be installed one-to-one with the multiple nozzles 10, so that the nozzles 10 can be connected to gas and / or air.

[0070] It should be noted that, in this embodiment, reference Figure 3 The air intake assembly 22 may include a shell, a first cover plate, a second cover plate, a mounting plate and other components, and its specific structure is not limited here.

[0071] In order to enable the burner to perform high-temperature air combustion in the full load section and reduce CO and NOx emissions, the present invention also proposes a new nozzle 10. It should be noted that the nozzle 10 of this embodiment can be used for other common burners in addition to the above-mentioned gas water heaters, which is not limited here.

[0072] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the nozzle 10 includes a nozzle body 100 and a movable part 200. The nozzle body 100 has an air inlet 100a, an injection outlet 100b and an injection channel 100c connecting the air inlet 100a and the injection outlet 100b; the movable part 200 is movably arranged in the injection channel 100c to adjust the flow rate of the gas injected from the injection channel 100c to the injection outlet 100b.

[0073] In this embodiment, the shape of the nozzle body 100 can be a curved tube or a rectangular parallelepiped, etc. The specific shape of the injection channel 100c in the nozzle body 100 can be designed according to actual needs and is not specifically limited here. The nozzle body 100 can be an integrally formed structure, and the air inlet section and the air outlet section can be formed by injection molding; of course, a split structure can also be adopted, and two or more parts can be assembled together by bonding or clamping, etc., and seals can be provided between the parts to prevent leakage of gas and / or air. The specific structure of the nozzle body 100 is not limited here.

[0074] It should be noted that the movable part 200 can be a valve core or a movable rod with silicone or rubber on one end. It can be an integrally formed structure or a split assembly structure. The specific material and structure of the movable part 200 are not limited here.

[0075] It can be understood that the present invention provides the nozzle body 100 of the nozzle 10 with an air inlet 100a, an injection outlet 100b and an injection channel 100c connecting the air inlet 100a and the injection outlet 100b, and the movable part 200 is movably arranged in the injection channel 100c to adjust the gas flow rate injected from the injection channel 100c to the injection outlet 100b, so that when the gas water heater performs high-temperature air combustion under different loads, the jet speed ejected from the nozzle 10 can be adaptively adjusted, which can avoid the jet speed being too high and causing the jet to hit the wall and causing the wall temperature to be too high, thereby realizing high-temperature air combustion of the burner in the full load section and reducing CO and NOx emissions.

[0076] In one embodiment, the movable member 200 can change the gas flow area of ​​the injection channel 100c by moving in the injection channel 100c, so as to adjust the flow rate of the gas injected through the injection channel 100c to the injection outlet 100b.

[0077] In this embodiment, when the movable part 200 moves in the injection channel 100c, it can increase or decrease the flow area of ​​the injection channel 100c that allows the gas to pass through; when the flow area is reduced, the flow velocity of the mixed gas with the same kinetic energy input passing through here will increase, thereby increasing the jet velocity of the injection outlet 100b; and when the flow area is increased, the flow velocity of the mixed gas with the same kinetic energy input passing through here will decrease, thereby reducing the jet velocity of the injection outlet 100b.

[0078] In order to improve the convenience of the movable member 200 in adjusting the jet velocity of the ejection outlet 100b and improve the accuracy of the jet velocity adjustment, in some embodiments, reference is made to Figure 1 and Figure 2The movable part 200 may include a push rod 210 and an adjusting head 220. The push rod 210 has a first end and a second end opposite to each other. The first end of the push rod 210 is inserted into the injection channel 100c from outside the injection channel 100c; the adjusting head 220 is disposed in the injection channel 100c and connected to the first end of the push rod 210; the push rod 210 moves back and forth along the first direction, driving the adjusting head 220 to switch back and forth between the first position and the second position to change the gas flow area of ​​the injection channel 100c.

[0079] It should be noted that the first direction may be the length direction of the push rod 210 or other directions, and may be set according to actual application scenarios and is not limited here.

[0080] The push rod 210 may be made of metal or plastic, and the adjusting head 220 may be made of rubber or silicone. Of course, in some other embodiments, the push rod 210 and the adjusting head 220 of the movable member 200 may also be made of the same material in one piece, which is not limited here.

[0081] Further, in one embodiment, referring to Figure 1 and Figure 2 The injection channel 100c may include an air intake section and an injection section, the air intake section and the injection section are connected to the air intake port 100a and the injection outlet 100b in sequence, and the regulating head 220 is movably arranged in the injection section; when the regulating head 220 switches from the first position to the second position, the gas flow area of ​​the injection section is controlled to decrease, and when the regulating head 220 switches from the second position to the first position, the gas flow area of ​​the injection section is controlled to increase. Such a configuration realizes a wider jet velocity adjustment range and also improves the accuracy of jet velocity control.

[0082] In order to further improve the adjustment accuracy of the movable member 200 on the gas flow rate ejected from the ejection outlet 100b, in one embodiment, reference is made to Figure 1 and Figure 2 , the radial cross-sectional area of ​​the injection section decreases from the air inlet section to the injection outlet 100b; the shape of the adjusting head 220 is adapted to the shape of the injection section, the axis of the adjusting head 220 coincides with the axis of the injection section, and a variable flow channel (the variable flow channel may be an annular structure) is formed between the peripheral wall of the adjusting head 220 and the injection section of the injection channel 100c; when the adjusting head 220 switches from the first position to the second position, the gas flow area of ​​the variable flow channel decreases, so that the gas flow area of ​​the injection section decreases, and when the adjusting head 220 switches from the second position to the first position, the gas flow area of ​​the variable flow channel increases, so that the gas flow area of ​​the injection section increases.

[0083] In this embodiment, the regulating head 220 is arranged in a cone or truncated cone shape. Of course, in some other embodiments, the regulating head 220 with a trapezoidal axial cross section may also be adopted, and the shape of the regulating head 220 may be adaptively modified according to the actual structure of the nozzle 10 and the influence of the jet velocity on the high-temperature air, which is not limited here.

[0084] In one embodiment, reference Figure 1 and Figure 2 When the regulating head 220 is in the first position, at least a portion of it is in the injection section; when the regulating head 220 is in the second position, the regulating head 220 can seal the variable flow channel.

[0085] It can be understood that in the process of moving the adjusting head 220 from the first position to the second position, the flow area of ​​the variable flow channel of the injection channel 100c is continuously reduced, and the gas flow rate of the injection outlet 100b is gradually increased; when the adjusting head 220 is in the second position, the adjusting head 220 can block the variable flow channel, and at this time, the gas flow rate of the injection outlet 100b is close to 0; and in the process of moving the adjusting head 220 from the second position to the first position, the flow area of ​​the variable flow channel of the injection channel 100c is continuously reduced, and the gas flow rate of the injection outlet 100b is gradually reduced.

[0086] Further, in one embodiment, referring to Figure 1 and Figure 2 The second end of the push rod 210 may be provided with a limiting portion 211. When the adjustment head 220 is in the second position, the limiting portion 211 abuts against the peripheral wall of the nozzle body 100 to limit the push rod 210 from continuing to move in the first direction.

[0087] In this embodiment, a baffle or a stopper may be provided at the extended end of the push rod 210 to form the above-mentioned limiting portion 211. When the baffle or the stopper abuts against the outer wall of the nozzle body 100 (that is, the adjusting head 220 is in the second position), the adjusting head 220 of the movable member 200 seals the variable flow channel; of course, in some application scenarios, a certain gap may be left between the peripheral wall of the adjusting head 220 and the inner wall of the variable flow channel when the adjusting head 220 is in the second position to ensure the passage of the mixed gas, which is not limited here.

[0088] In order to manually adjust the movable member 200 to move along the first direction, in one embodiment, refer to Figure 1 and Figure 2 The second end of the push rod 210 is provided with a gripping portion 212 for manually controlling the push rod 210 to move back and forth along the first direction. This arrangement can improve the convenience of operation.

[0089] In some embodiments, reference Figure 1The nozzle body 100 has a mounting hole 100d on its peripheral wall, a guide bearing (not shown) is disposed in the mounting hole 100d, and the first end of the push rod 210 is inserted into the injection channel 100c through the guide bearing. This arrangement can improve the smoothness of the movement of the movable part 200 and the control accuracy of the jet velocity.

[0090] Of course, in some embodiments, when the guide bearing is not installed in the above-mentioned mounting hole 100d, the nozzle 10 may also include a seal, which is arranged in the mounting hole 100d to seal the gap between the outer wall of the movable part 200 and the mounting hole 100d of the nozzle body 100.

[0091] It should be noted that in this case, in order to ensure that the movable part 200 can move smoothly, the sealing member cannot completely seal the installation gap, and a certain gap should be left for the sliding of the movable part 200. Among them, lubricating liquid can be applied between the outer wall of the movable part 200 and the outer wall of the sealing member to improve the smoothness of adjusting the movable part 200 and facilitate operation.

[0092] In order to achieve more accurate and convenient regulation of the gas flow rate injected by the nozzle 10, the present invention also proposes a gas distribution device, which can be applied to a burner or a device that needs to use the nozzle 10 to adjust the gas injection speed, which is not limited here.

[0093] Main references Figure 2 In one embodiment of the present invention, the gas distribution device includes a driving member 300, which is drivingly connected to the movable member 200 to drive the movable member 200 to adjust the flow rate of the gas ejected from the ejection channel 100c to the ejection outlet 100b.

[0094] In this embodiment, the driving member 300 may use a stepping motor or the like as a driving source, which is not limited here.

[0095] It should be noted that in some embodiments, when the gas distribution device is applied to a gas water heater, the air inlet 100a of the nozzle 10 can be connected to the air outlet of the preheater through the air inlet assembly 22 to access the mixed gas. Of course, in some other embodiments, the nozzle 10 of the gas distribution device can also be connected to an external gas source through an air inlet pipeline, which is not limited here.

[0096] Further, in one embodiment, referring to Figure 2 The gas distribution device may further include a controller 400, which is electrically connected to the driving member 300 to control the driving member 300 to operate according to the load signal to adjust the flow rate of the gas ejected from the ejection channel 100c to the ejection outlet 100b.

[0097] The controller 400 may be a control unit such as a single chip microcomputer, a DSP or an FPGA, etc., which is not limited here. In this embodiment, the controller 400 may control the movable member 200 to move along the first direction according to the input load signal, thereby controlling the area size of the injection channel 100c allowing the mixed gas to flow, thereby controlling the gas flow rate of the mixed gas injected from the injection outlet 100b of the nozzle 10.

[0098] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A nozzle for a gas water heater, characterized in that: The nozzle comprises: a nozzle body, the nozzle body having an air inlet, an injection outlet, and an injection channel connecting the air inlet and the injection outlet; and a movable member, movably disposed in the injection channel, for adjusting a flow rate of the gas injected through the injection channel toward the injection outlet; The movable parts include: A push rod, the push rod having a first end and a second end opposite to each other, the first end of the push rod being inserted into the injection channel from outside the injection channel; and An adjusting head, disposed in the injection channel and connected to the first end of the push rod; The push rod moves back and forth along the first direction, driving the regulating head to switch back and forth between the first position and the second position, so as to change the gas flow area of ​​the injection channel; The second end of the push rod is provided with a gripping portion for manually controlling the push rod to move back and forth along the first direction; The injection channel includes an air intake section and an injection section, the air intake section and the injection section are connected to the air intake port and the injection outlet in sequence, and the regulating head is movably arranged in the injection section; the air intake section is extended along the second direction, and the injection section is extended along the first direction, the first direction is perpendicular to the second direction, and the injection outlet is arranged at the end of the injection section.

2. The nozzle according to claim 1, characterized in that The movable member changes the gas flow area of ​​the injection channel by moving in the injection channel, so as to adjust the flow rate of the gas injected through the injection channel to the injection outlet.

3. The nozzle according to claim 1, characterized in that When the regulating head switches from the first position to the second position, the gas flow area of ​​the injection section is controlled to decrease. When the regulating head switches from the second position to the first position, the gas flow area of ​​the injection section is controlled to increase.

4. The nozzle according to claim 3, characterized in that The radial cross-sectional area of ​​the injection section decreases from the air inlet section to the injection outlet; The shape of the regulating head is adapted to the shape of the injection section, the axis of the regulating head coincides with the axis of the injection section, and a variable flow channel is formed between the peripheral wall of the regulating head and the injection section of the injection channel; When the regulating head switches from the first position to the second position, the gas flow area of ​​the variable flow channel decreases, so that the gas flow area of ​​the injection section decreases. When the regulating head switches from the second position to the first position, the gas flow area of ​​the variable flow channel increases, so that the gas flow area of ​​the injection section increases.

5. The nozzle according to claim 4, characterized in that The regulating head is arranged in a cone or a truncated cone shape.

6. The nozzle according to claim 4, characterized in that When the regulating head is in the first position, at least a portion of the regulating head is in the injection section; When the regulating head is in the second position, the regulating head seals the variable flow channel.

7. The nozzle according to claim 1, characterized in that A limiting portion is provided at the second end of the push rod. When the adjusting head is in the second position, the limiting portion abuts against the peripheral wall of the nozzle body to limit the push rod from continuing to move in the first direction.

8. The nozzle according to claim 1, characterized in that A mounting hole is provided on the peripheral wall of the nozzle body, a guide bearing is provided in the mounting hole, and the first end of the push rod is inserted into the injection channel through the guide bearing.

9. A gas distribution device, characterized in that: The gas distribution device comprises: A nozzle, wherein the nozzle is the nozzle according to any one of claims 1 to 8; and A driving member is drivingly connected to the movable member of the nozzle so as to drive the movable member to adjust the flow rate of the gas ejected through the ejection channel to the ejection outlet.

10. The gas distribution device according to claim 9, characterized in that The gas distribution device also includes: A controller is electrically connected to the driving member to control the driving member to work according to a load signal so as to adjust the flow rate of the gas ejected from the ejection channel to the ejection outlet.

11. A burner for a gas water heater, characterized in that: The burner comprises: a combustion body having a combustion chamber formed therein; and A gas distribution device, installed on the combustion body, wherein the gas distribution device is a gas distribution device as claimed in any one of claims 9 to 10; Among them, multiple nozzles are penetrated on the combustion body and arranged along the first circumferential direction of the combustion chamber. The injection outlets of multiple nozzles are located in the combustion chamber. Multiple nozzles are used to inject gas and / or air into the combustion chamber and form a vortex flow along the first circumferential direction in the combustion chamber to enable high-temperature air combustion to occur in the combustion chamber.

12. The burner according to claim 11, characterized in that The combustion body comprises: A plurality of side plates, wherein the plurality of side plates enclose a rectangular combustion chamber, and the plurality of nozzles are disposed on the plurality of side plates; and An air intake assembly is installed on the side plate. The air intake assembly is formed with an air intake cavity. The air intake cavity is used to connect to an external air source. The air intake ports of the plurality of nozzles are connected to the air intake cavity.

13. The burner according to claim 12, characterized in that The plurality of nozzles are evenly spaced and arranged on the two side plates of the combustion body which are arranged opposite to each other along the width direction, and are staggered in the length direction of the combustion body.

14. A gas water heater, characterized in that: The gas water heater comprises: A main body, wherein a heat exchange chamber and a smoke exhaust port communicated with the heat exchange chamber are arranged in the main body; A heat exchanger is disposed in the heat exchange chamber; a preheater, mounted on the main body, for preheating the mixed gas to a target temperature before delivering it to the combustion chamber; and A burner, wherein the burner is the burner according to any one of claims 11 to 13, the burner is mounted on the main body, and the flue gas outlet of the burner is connected to the heat exchange chamber; Wherein, the fuel gas and / or air is sprayed into the combustion chamber at a preset jet velocity through the nozzle, so that a high-temperature air combustion reaction occurs in the combustion chamber.

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