Gas premixer, gas water heating device and control method

Abstract

The present application relates to hot water supply equipment technical field, disclose a kind of gas premixing device, gas water heating equipment and control method. Among them, gas premixing device includes premixing outer tube and premixing inner tube, premixing outer tube is equipped with air passage, premixing inner tube is located in premixing outer tube, the outer wall between premixing inner tube and the inner wall of premixing outer tube is enclosed to form the gas chamber being communicated with gas inlet, premixing inner tube is equipped with spoiler, gas mixing passage and air passage being communicated with air inlet, gas mixing passage is respectively communicated with the outlet of air passage and the outlet of gas chamber, at least part of spoiler is located in gas mixing passage. The present application is equipped with multiple spoiler being communicated with gas outlet passage by being located in the inner wall circumferential side of gas mixing passage, gas flows out from gas outlet passage and enters into spoiler, under the spoiler effect of gas in spoiler, make gas and air form turbulent flow at gas mixing passage, realize the sufficient mixing of gas and air.

Description

Technical Field

[0001] This invention relates to the field of hot water supply equipment technology, and in particular to a gas premixer, a gas-fired hot water equipment, and a control method. Background Technology

[0002] Gas-fired water heating equipment is a device that uses gas as an energy source to heat water. It is widely used in homes, businesses, and industries for supplying hot water. Common types of gas-fired water heating equipment include gas water heaters and gas-fired wall-hung boilers.

[0003] In existing technology, gas-fired water heaters are equipped with a gas premixer. A fan generates negative pressure within the premixer, drawing air from inside the water heater into it. Simultaneously, a gas proportioning valve opens, allowing gas to enter the premixer, thus achieving proportional premixing of gas and air. However, current gas premixers suffer from uneven mixing of air and gas, leading to incomplete combustion. Summary of the Invention

[0004] The first technical problem solved by this invention is to provide a gas premixer that effectively solves the problem of uneven mixing when mixing air and gas in existing gas premixers.

[0005] The second technical problem solved by this invention is to provide a gas-fired water heating device that effectively solves the problem of the difficulty in accurately controlling the mixing ratio of gas and air in existing gas-fired water heating devices.

[0006] The third technical problem solved by this invention is to provide a control method for a gas-fired water heater, which effectively solves the problem that the mixing ratio of gas and air is difficult to control accurately in existing gas-fired water heaters.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A gas premixer, comprising:

[0009] The premixed outer pipe is provided with an air inlet and a gas inlet, and the premixed outer pipe is provided with a gas inlet;

[0010] A premixed inner tube is disposed inside the premixed outer tube. The outer wall of the premixed inner tube and the inner wall of the premixed outer tube enclose a gas chamber. The gas inlet is connected to the inlet of the gas chamber. The premixed inner tube is provided with a turbulence section, a gas mixing channel, and an air channel. The air inlet is connected to the inlet of the air channel. The gas mixing channel is connected to the outlet of the air channel and the outlet of the gas chamber, respectively. At least part of the turbulence section is disposed inside the gas mixing channel.

[0011] Compared with the prior art, the gas premixer of the present invention has the following advantages: Taking a gas-fired water heater as an example, the gas premixer is installed inside the gas-fired water heater, and the mixing channel is connected to the fan inside the gas-fired water heater. When the fan is running, outside air is drawn into the air channel through the air inlet of the premixed outer pipe. Because the premixed inner pipe has an air channel and a mixing channel connected to the air channel, air in the air channel enters the mixing channel. Gas enters the gas chamber between the premixed inner pipe and the premixed outer pipe from the gas inlet. Since the mixing channel on the premixed inner pipe is connected to the outlet of the gas chamber, the gas in the gas chamber flows out through the gas chamber outlet and mixes with the air at the mixing channel.

[0012] Furthermore, since at least part of the turbulence section is located in the mixing channel, the gas flows out of the gas chamber outlet and enters the mixing channel. Under the turbulence effect of the turbulence section, the gas and air in the mixing channel form turbulence, which realizes the full mixing of gas and air, provides good conditions for efficient combustion, effectively improves combustion efficiency, and reduces energy waste.

[0013] In addition, placing the premixing inner pipe inside the premixing outer pipe ensures that the gas and air are fully mixed while making the premixer structure compact. This helps to install the gas premixer in limited spaces such as gas water heaters, reducing the overall size of the gas water heater. It also facilitates the overall layout and pipe connection of the gas water heater, improving the integration and reliability of the gas water heater.

[0014] In one embodiment, the premixed inner tube includes a base and a venturi tube disposed on the base. The venturi tube has the air passage. The base has an outlet pipe extending away from the venturi tube, and the outlet pipe has the mixing passage. The throat of the venturi tube is inserted into the outlet pipe and forms a gas outlet passage between it and the inner wall of the outlet pipe. The gas chamber communicates with the mixing passage through the gas outlet passage.

[0015] In one embodiment, at least a portion of the turbulence portion is disposed within the gas outlet channel, one end of the turbulence portion extending to the outlet of the gas outlet channel and forming a first angle with the plane where the outlet of the gas outlet channel is located, the first angle being less than 90°.

[0016] In one embodiment, the air inlet is located at one end face of the premixed outer tube. The premixed outer tube has an outer tube body and an annular protrusion extending away from the air inlet along the inner wall of the outer tube body. An annular cavity communicating with the gas chamber is left between the annular protrusion and the inner wall of the outer tube body. A first mounting step for installing a sealing ring is formed at the connection between the end of the annular protrusion near the air inlet and the inner wall of the outer tube body. A second mounting step is provided on the outer wall periphery of the other end. The inlet end of the venturi tube has a first connecting part, which abuts against the second mounting step.

[0017] The outer tube body is provided with a third mounting step at one end near the air inlet, and the base is provided with a second connecting part, which cooperates with the third mounting step to abut.

[0018] In one embodiment, there are multiple turbulence portions, each of which is spaced apart along the inner peripheral wall of the mixing channel and extends axially along the mixing channel.

[0019] In one embodiment, the turbulence portion is a long strip-shaped protrusion structure, one end of which extends to the outlet of the mixing channel and forms a second angle with the plane where the outlet of the mixing channel is located, the second angle being less than 90°.

[0020] In one embodiment, the system further includes a gas pipe connector and a nozzle sealed within the gas pipe connector, one end of which is connected to the gas inlet and the other end of which is connected to a gas proportional valve.

[0021] In one embodiment, the outer wall of the premixed outer pipe is provided with a connecting pipe section communicating with the gas inlet. The connecting pipe section has a slot for inserting a retaining spring. The outer surface of the gas pipe connector has an annular groove corresponding to the slot. The gas pipe connector is embedded in the connecting pipe section and is inserted into the slot and engaged with the annular groove by the retaining spring, so that the gas pipe connector and the connecting pipe section are detachably connected.

[0022] In one embodiment, a first pipe joint is provided on the outer wall of the premixed outer pipe, and an air pressure tapping hole communicating with the air channel is provided in the first pipe joint, the axis of the air pressure tapping hole being perpendicular to the axis of the air channel;

[0023] The outer wall of the gas pipe connector is provided with a second pipe connector, and the second pipe connector is provided with a gas pressure tapping hole that communicates with the interior of the gas pipe connector. The axis of the gas pressure tapping hole is perpendicular to the axis of the gas pipe connector.

[0024] The second technical problem mentioned above is solved by the following technical solution:

[0025] A gas-fired water heater includes:

[0026] The housing contains a gas proportional valve.

[0027] A gas premixer is disposed within the housing;

[0028] A gas pipe connector, one end of which is connected to the gas inlet and the other end of which is connected to the gas proportional valve;

[0029] The detection unit is used to detect the air pressure value in the air channel and the gas pressure value in the gas pipe connector;

[0030] The controller is electrically connected to the detection unit and the gas proportional valve, respectively, and is used to calculate the pressure difference between the air pressure value and the gas pressure value detected by the detection unit, compare the pressure difference value with a preset range value, and control the gas proportional valve to adjust the gas flow rate according to the comparison result.

[0031] Compared with the prior art, the gas-fired water heater of the present invention has the following advantages: A gas premixer is installed inside the gas-fired water heater. The detection unit acquires the air pressure value in the air passage and the gas pressure value in the gas pipe joint in real time, providing accurate pressure data to the controller. Based on the data fed back by the detection unit, the controller calculates the pressure difference between the air pressure value and the gas pressure value, and then compares the calculated pressure difference value with a preset range value. Based on the comparison result, the controller controls the gas proportional valve to adjust the gas flow rate. Through this method, the actual supply of gas and air can be accurately understood, and the impact of pressure changes on the air-fuel ratio can be detected in a timely manner. This allows for precise control of the gas proportional valve, ensuring that the gas and air are always maintained at the optimal mixing ratio, improving combustion efficiency, and guaranteeing good combustion performance of the gas-fired water heater under different operating conditions.

[0032] The third technical problem mentioned above is solved by the following technical solution:

[0033] A control method for a gas-fired hot water device, the method comprising:

[0034] Based on the air pressure value and the gas pressure value detected by the detection unit, the pressure difference between the air pressure value and the gas pressure value is calculated;

[0035] Determine whether the differential pressure value is within the preset range.

[0036] Based on the differential pressure value being within the preset range, the controller controls the gas proportional valve to maintain the current gas flow rate; or based on the differential pressure value being outside the preset range, the controller controls the gas proportional valve to adjust the gas flow rate so that the differential pressure value is within the preset range.

[0037] Compared with the prior art, the control method for gas-fired water heaters described in this invention has the following advantages: By calculating the pressure difference between air pressure and gas pressure and comparing it with a preset range, the mixing ratio of gas and air can be monitored in real time. When the pressure difference is within the preset range, the controller controls the gas proportional valve to maintain the current gas flow rate, ensuring that gas and air are mixed in a suitable ratio, thus stabilizing the combustion process of the gas-fired water heater. When the pressure difference exceeds the preset range, the controller adjusts the gas proportional valve to regulate the gas flow rate, bringing the pressure difference back to the normal range, i.e., within the preset range, ensuring that combustion is always in optimal condition. This allows the gas-fired water heater to adapt to various complex operating conditions and provide a stable hot water supply. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of a gas premixer according to an embodiment of the present invention;

[0040] Figure 2 for Figure 1 An explosion diagram;

[0041] Figure 3 for Figure 1 A sectional view;

[0042] Figure 4 This is a schematic diagram of the premixed inner tube.

[0043] Figure 5 for Figure 4 Another perspective structural diagram;

[0044] Figure 6 for Figure 5 Top view;

[0045] Figure 7 This is a schematic diagram of a gas premixer according to an embodiment of the present invention.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Premixed outer pipe; 101. Outer pipe body; 102. Air inlet; 103. Gas inlet; 104. Air pressure tap; 105. First mounting hole; 106. Second mounting hole; 2. Premixed inner pipe; 201. Base; 2011. Mixing passage; 2012. Gas outlet passage; 2013. Third mounting step; 202. Venturi tube; 2021. Throat section; 203. Gas chamber; 204. First connection part; 205. Air passage; 206. Second connecting part; 3. Turbulence part; 4. Annular protrusion; 401. First mounting step; 402. Second mounting step; 5. Annular cavity; 6. Gas pipe connector; 601. Annular groove; 602. Gas pressure tapping hole; 7. Nozzle; 8. Gas proportional valve; 9. Connecting pipe part; 901. Slot; 10. Snap ring; 11. Detection unit; 12. Gas outlet pipe part; 13. First pipe connector; 14. Second pipe connector; A. First included angle; B. Second included angle. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] In the description of this application, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] In related technologies, gas-fired water heaters are equipped with a gas premixer. A fan generates negative pressure within the premixer, drawing air from inside the water heater into it. Simultaneously, a gas proportioning valve opens, allowing gas to enter the premixer, thus achieving proportional premixing of gas and air. However, current gas premixers suffer from uneven mixing of air and gas, leading to incomplete combustion.

[0053] To solve the above technical problems, the following will be combined with... Figures 1 to 7 The following describes embodiments of the present invention.

[0054] According to embodiments of the present invention, in one aspect, such as Figures 1 to 5 As shown, a gas premixer is provided, including a premixed outer pipe 1 and a premixed inner pipe 2.

[0055] Specifically, such as Figures 1 to 3 As shown, the premixed outer pipe is provided with an air inlet 102 and a gas inlet 103.

[0056] Specifically, such as Figure 2 and Figure 3 As shown, the premixed inner tube 2 is installed inside the premixed outer tube 1, wherein the outer wall of the premixed inner tube 2 and the inner wall of the premixed outer tube 1 enclose a gas chamber 203, and the gas chamber 203 is connected to the gas inlet 103.

[0057] Specifically, such as Figure 2 and Figure 3 As shown, the premixed inner pipe 2 is provided with an air passage 205 connected to the air inlet 102. The premixed inner pipe 2 is also provided with a turbulence section 3 and a mixing passage 2011. The mixing passage 2011 is connected to the outlet of the air passage 205 and the outlet of the gas chamber 203, respectively. At least part of the turbulence section 3 is provided in the mixing passage 2011.

[0058] Taking a gas-fired water heater as an example, this gas premixer is installed inside the gas-fired water heater, with the mixing channel 2011 connected to the fan inside the gas-fired water heater. When the fan is running, outside air is drawn into the air channel 205 through the air inlet 102 of the premixed outer pipe 1. Because the premixed inner pipe 2 has the air channel 205 and the mixing channel 2011 connected to the air channel 205, the air in the air channel 205 enters the mixing channel 2011. Gas enters from the gas inlet 103 into the gas chamber 203 between the premixed inner pipe 2 and the premixed outer pipe 1. Since the mixing channel 2011 on the premixed inner pipe 2 is connected to the outlet of the gas chamber 203, the gas in the gas chamber 203 flows out through the outlet of the gas chamber 203 and mixes with the air at the mixing channel 2011.

[0059] Furthermore, since at least part of the turbulence section 3 is located in the mixing channel 2011, the gas flows out of the gas chamber 203 and enters the mixing channel 2011. Under the turbulence effect of the turbulence section 3 on the gas, the gas and air in the mixing channel 2011 form turbulence, which realizes the full mixing of gas and air, provides good conditions for efficient combustion, effectively improves combustion efficiency, and reduces energy waste.

[0060] In addition, by placing the premixing inner pipe 2 inside the premixing outer pipe 1, the premixer structure is made compact while ensuring that the gas and air are fully mixed. This helps to install the gas premixer in limited spaces such as gas water heaters, reducing the overall size of the gas water heater. It also facilitates the overall layout and pipe connection of the gas water heater, improving the integration and reliability of the gas water heater.

[0061] Specifically, the premixed outer tube 1 can be set to any existing shape. For example, the premixed outer tube 1 can be set to a sleeve shape, a tube shape, etc. In this embodiment of the application, the shape of the premixed outer tube 1 is not specifically limited.

[0062] Specifically, the flow-dispersing part 3 can be configured in any existing shape. For example, the flow-dispersing part 3 can be an arc-shaped groove, a bent groove, or a wave-shaped groove, or it can be a flow-dispersing protrusion. In this embodiment, the shape of the flow-dispersing part 3 is not specifically limited.

[0063] In one embodiment, combined Figures 3 to 6 As shown, there are multiple turbulence sections 3, each turbulence section 3 is spaced apart on the inner peripheral wall of the mixing channel 2011, and each turbulence section 3 extends along the axial direction of the mixing channel 2011.

[0064] Because the inner wall of the mixing channel 2011 is provided with multiple turbulence parts 3 at intervals, the multiple turbulence parts 3 can form multiple turbulence sources at different positions of the mixing channel 2011, so that the gas and air can form multiple turbulences when passing through the mixing channel 2011, ensuring that the gas and air in the mixing channel 2011 are mixed more fully.

[0065] Since the turbulence section 3 extends axially along the mixing channel 2011, it increases the flow path of gas and air within the mixing channel 2011. The longer mixing path allows the gas and air to mix more thoroughly, ensuring that the gas and air reach a better mixing ratio before combustion.

[0066] Specifically, the multiple flow-disrupting parts 3 can be evenly spaced around the inner wall of the mixing channel 2011, or they can be non-uniformly spaced. In this embodiment, the distribution of the multiple flow-disrupting parts 3 is not specifically limited.

[0067] Specifically, the inner wall of the mixing channel 2011 may be provided with one turbulence part 3, or multiple turbulence parts 3 may be provided at intervals of two, three or four. In this embodiment of the application, the number of turbulence parts 3 is not specifically limited.

[0068] In one embodiment, such as Figure 5 and Figure 6 As shown, the turbulence section 3 has a long strip-shaped protrusion structure. One end of the long strip-shaped protrusion structure extends to the outlet of the mixing channel 2011, and the long strip-shaped protrusion structure forms a second angle B with the plane where the outlet of the mixing channel 2011 is located. The second angle B is less than 90°.

[0069] One end of the elongated protruding structure extends to the outlet of the mixing channel 2011, forming a second included angle B. This second included angle B is less than 90°, which guides the mixed airflow of the gas and air. When the mixed airflow exits the mixing channel 2011, the turbulence section 3 changes the direction of the mixed airflow, causing it to flow out at an angle to the plane where the outlet of the mixing channel 2011 is located. This prevents the mixed airflow from flowing directly out along the axial direction of the mixing channel 2011, thereby extending the flow path of the gas and air and enhancing the mixing effect.

[0070] By providing multiple elongated protruding structures of turbulence portion 3 on the inner wall of the mixing channel 2011, the turbulence portion 3 can be processed on the inner wall of the mixing channel 2011, simplifying the processing technology of the turbulence portion 3 and reducing the processing difficulty.

[0071] Meanwhile, the turbulence section 3 enhances the structural strength of the mixing channel 2011 to a certain extent, enabling the mixing channel 2011 to better withstand the pressure of gas and air, improving the overall stability of the mixing channel 2011, and helping to improve the reliability and durability of the gas premixer.

[0072] Specifically, the turbulence part 3 and the inner wall of the mixing channel 2011 can be integrally formed, or the turbulence part 3 can be fixed to the inner wall of the mixing channel 2011 by means of bonding or other methods.

[0073] Specifically, by using appropriate positioning and fixing methods, it can be ensured that the spacing between adjacent spoilers 3 is uniform, thereby forming spoilers 3 with consistent size and regular shape.

[0074] Furthermore, such as Figure 3 and Figure 4 As shown, the premixed inner tube 2 includes a base 201 and a venturi tube 202, with the venturi tube 202 mounted on the base 201. The venturi tube 202 contains an air passage 205, and the base 201 has an outlet pipe section 12 extending away from the venturi tube 202, which contains a mixing passage 2011. The throat section 2021 of the venturi tube 202 is inserted into the outlet pipe section 12, forming a gas outlet passage 2012 between it and the inner wall of the outlet pipe section 12. The gas chamber 203 communicates with the mixing passage 2011 through the gas outlet passage 2012.

[0075] By providing an outlet pipe section 12 below the venturi tube 202, and having a mixing channel 2011 inside the outlet pipe section 12, the mixing channel 2011 inside the outlet pipe section 12 forms a mixing chamber with a certain height, increasing the flow path of gas and air in the mixing channel 2011, allowing gas and air to mix more fully, and ensuring that gas and air reach a better mixing ratio before combustion.

[0076] Because the throat section 2021 of the Venturi tube 202 is inserted into the mixing channel 2011 of the base 201, air is accelerated by the Venturi tube 202 and enters the mixing channel 2011 from the throat section 2021. Gas enters from the gas inlet 103 into the gas chamber 203 between the premixed inner pipe 2 and the premixed outer pipe 1. Since a gas outlet channel 2012 is formed between the throat section 2021 of the Venturi tube 202 and the inner wall of the outlet pipe 12, the gas in the gas chamber 203 flows out through the gas outlet channel 2012 and mixes with the air in the mixing channel 2011.

[0077] Specifically, the exhaust pipe 12 can be integrally formed with the premixed inner pipe 2, or the exhaust pipe 12 can be installed at the position of the mixing channel 2011 by connection.

[0078] Specifically, such as Figure 3As shown, the premixed inner tube 2 is disposed inside the premixed outer tube 1, and the venturi tube 202 is disposed above the base 201. A gas chamber 203 is formed between the venturi tube 202, the base 201, and the inner wall of the premixed outer tube 1. The shape of the gas chamber 203 can be set to any existing shape. In this embodiment, the shape of the gas chamber 203 is not specifically limited.

[0079] For example, such as Figure 3 As shown, the gas chamber 203 can be an annular chamber, and the gas chamber 203 is located near the bottom of the premixed outer pipe 1.

[0080] Specifically, such as Figure 3 As shown, the throat section 2021 of the venturi tube 202 can be coaxially arranged with the mixing channel 2011 of the base 201, so that an annular gas outlet channel 2012 is formed between the throat section 2021 and the mixing channel 2011, ensuring that the gas in the gas chamber 203 can flow out evenly from the gas outlet channel 2012.

[0081] Furthermore, such as Figure 4 As shown, at least a portion of the turbulence section 3 is provided in the gas outlet passage 2012. One end of the turbulence section 3 extends to the outlet of the gas outlet passage 2012 and forms a first angle A with the plane where the outlet of the gas outlet passage 2012 is located. The first angle A is less than 90°.

[0082] At least a portion of the turbulence-disrupting part 3 is disposed within the gas outlet channel 2012. This ensures that as the gas flows from the gas chamber 203 into the gas outlet channel 2012, it is disturbed by the turbulence-disrupting part 3, thus initiating the gas-air mixing process earlier. Before the gas fully enters the main area of ​​the mixing channel 2011, it begins to interact with the surrounding air, forming preliminary turbulence, thereby ensuring more thorough mixing in the mixing channel 2011. Simultaneously, one end of the turbulence-disrupting part 3 forms a first angle A with the plane where the outlet of the gas outlet channel 2012 is located, where the first angle A is less than 90°, guiding the gas flow. When the gas flows out of the gas outlet channel 2012, the turbulence-disrupting part 3 changes the direction of the gas flow, causing it to flow out at an angle to the plane where the outlet of the gas outlet channel 2012 is located, preventing the gas flow from flowing directly out along the axial direction of the gas outlet channel 2012, thereby extending the gas flow path and enhancing the gas-air mixing effect.

[0083] In this embodiment, the middle part of the elongated protruding structure of the turbulence section 3 adopts an arc transition design, which further extends the flow path of gas and air and enhances the mixing effect of gas and air.

[0084] In one embodiment, such as Figure 3 and Figure 4As shown, the air inlet 102 is located at one end face of the premixed outer pipe 1. The premixed outer pipe 1 has an outer pipe body 101 and an annular protrusion 4 extending away from the air inlet 102 around the inner wall of the outer pipe body 101. An annular cavity 5 is left between the annular protrusion 4 and the inner wall of the outer pipe body 101, and the annular cavity 5 communicates with the gas chamber 203. Among them, the end of the annular protrusion 4 near the air inlet 102 forms a first mounting step 401 at the connection with the inner wall of the outer pipe body 101. The first mounting step 401 is used to install the sealing ring.

[0085] The outer wall of the other end of the annular protrusion 4 is provided with a second mounting step 402, and the inlet end of the venturi tube 202 is provided with a first connecting part 204 corresponding to the second mounting step 402. The first connecting part 204 and the second mounting step 402 cooperate to abut against each other.

[0086] The outer tube 101 is provided with a third mounting step 2013 at one end near the air inlet 102, and the base 201 is provided with a second connecting part 206, which cooperates with the third mounting step 2013 to abut.

[0087] An annular cavity 5 is formed between the annular protrusion 4 and the inner wall of the outer tube 101. The annular cavity 5 is connected to the gas chamber 203, which increases the volume of the gas chamber 203, allowing more gas to enter the gas chamber 203 at one time.

[0088] Since the annular protrusion 4 forms a first installation step 401 at the connection between the inner wall of the outer tube 101, a sealing ring can be installed at the first installation step 401 to connect with the external silencer pipe, which can effectively seal the air passage 205 and prevent the air in the air passage 205 from leaking from the connection between the premixed outer tube 1 and the silencer pipe.

[0089] The first connecting part 204 at the inlet end of the Venturi tube 202 abuts against the second mounting step 402 of the annular protrusion 4, and the outer tube body 101 abuts against the base 201 through the third mounting step 2013, ensuring the sealing of the connection between the premixed inner tube 2 and the outer tube body 101, thereby ensuring the sealing of the gas chamber 203, reducing the risk of gas leakage, and ensuring that the gas flows and mixes in the sealed space inside the gas premixer.

[0090] Meanwhile, the contact between the second mounting step 402 and the first connecting part 204 of the venturi tube 202, and the connection between the second connecting part 206 and the third mounting step 2013 in contact between the outer tube body 101 and the base 201, make the connection between the premixed inner tube 2 and the premixed outer tube 1 more stable, effectively preventing relative displacement or loosening between the premixed inner tube 2 and the premixed outer tube 1, and ensuring the stability of the gas premixer.

[0091] In addition, the second mounting step 402 and the third mounting step 2013 provide a positioning reference for the assembly of the premixed inner tube 2 and the premixed outer tube 1, so that the premixed inner tube 2 and the premixed outer tube 1 can be quickly installed in place during the assembly process.

[0092] Specifically, such as Figure 2 As shown, multiple first mounting holes 105 and second mounting holes 106 can be provided on the outer tube body 101 of the premixed outer tube 1. The silencer tube can be installed on the premixed outer tube 1 through the first mounting hole 105, and the premixed outer tube 1 and the premixed inner tube 2 can be installed on the fan through the second mounting hole 106.

[0093] In one embodiment, such as Figure 1 and Figure 2 As shown, it also includes a gas pipe connector 6 and a nozzle 7, wherein the nozzle 7 is installed inside the gas pipe connector 6, one end of the gas pipe connector 6 is connected to the gas inlet 103, and the other end is used to connect to the gas proportional valve 8.

[0094] The nozzle 7 is installed in the gas pipe connector 6, with one end of the connector connected to the gas inlet 103 and the other end connected to the gas proportional valve 8. The gas proportional valve 8 delivers precisely regulated gas through the gas pipe connector 6 and the nozzle 7 to the gas inlet 103 of the gas premixer. Under different operating loads, the gas quantity can be adjusted according to actual needs to ensure that the gas and air are always mixed in a suitable ratio, thereby achieving efficient combustion and improving energy utilization efficiency.

[0095] Specifically, the gas pipe connector 6 can be configured as a tubular structure, and the nozzle 7 can be selected according to the model of the gas water heater. In this embodiment, no specific restrictions are placed on the structure of the gas pipe connector 6 and the type of the nozzle 7.

[0096] Specifically, the gas pipe connector 6 is connected to the gas inlet 103, and the connection can be made by snap-fit ​​or internal and external thread engagement. In this embodiment, no specific restrictions are placed on the connection method between the gas pipe connector 6 and the gas inlet 103.

[0097] In one embodiment, such as Figure 1 and Figure 2 As shown, the outer wall of the premixed outer pipe 1 is provided with a connecting pipe section 9, which communicates with the gas inlet 103. The connecting pipe section 9 has a slot 901 for inserting a retaining spring 10, and the outer surface of the gas pipe connector 6 has an annular groove 601, which corresponds to the slot 901. The gas pipe connector 6 is embedded into the connecting pipe section 9, and the annular groove 601 is engaged by inserting the retaining spring 10 into the slot 901, thus achieving a detachable connection between the gas pipe connector 6 and the connecting pipe section 9.

[0098] When assembling the gas premixer, simply insert the gas pipe connector 6 into the connecting pipe section 9, then insert the retaining ring 10 into the slot 901 and engage it with the annular groove 601 to quickly connect the gas pipe connector 6 to the premixed outer pipe 1, thus connecting the gas pipe connector 6 to the gas inlet 103. This connection method shortens the installation time between the gas pipe connector 6 and the premixed outer pipe 1, improving production efficiency.

[0099] When the gas pipe connector 6 or related components need repair or replacement, the retaining ring 10 can be removed, the gas pipe connector 6 can be pulled out of the connecting pipe 9, and the corresponding maintenance or replacement work can be carried out. Then, a new gas pipe connector 6 or the repaired component can be reinstalled, which facilitates the replacement of the gas pipe connector 6. Since the nozzle 7 is located inside the gas pipe connector 6, different models of nozzles 7 can be replaced to make the gas premixer adaptable to different types of gas-fired water heaters.

[0100] Specifically, a sealing ring can be provided between the tracheal connector 6 and the connecting tube 9 to ensure the airtightness between the tracheal connector 6 and the connecting tube 9.

[0101] In one embodiment, such as Figure 1 and Figure 2 As shown, a first pipe joint 13 is provided on the outer wall of the premixed outer pipe 1. An air pressure tapping hole 104 is provided inside the first pipe joint 13. The air pressure tapping hole 104 is connected to the air channel 205, and the axis of the air pressure tapping hole 104 is perpendicular to the axis of the air channel 205.

[0102] The outer wall of the gas pipe connector 6 is provided with a second pipe connector 14, and the second pipe connector 14 is provided with a gas pressure tapping hole 602. The gas pressure tapping hole 602 is connected to the inside of the gas pipe connector 6, and the axis of the gas pressure tapping hole 602 is perpendicular to the axis of the gas pipe connector 6.

[0103] The air pressure in the air passage 205 can be directly measured through the air pressure tap 104, while the gas pressure in the gas pipe connector 6 can be measured through the gas pressure tap 602. By monitoring the air pressure in the air passage 205 and the gas pressure in the gas pipe connector 6, the actual supply of gas and air can be understood, thereby enabling precise control of equipment such as the gas proportional valve 8 and the blower to ensure that gas and air are always mixed in the appropriate ratio for efficient combustion.

[0104] The presence of a first pipe connector 13 and a second pipe connector 14 on the gas premixer facilitates the connection between the external detection unit 11 and the air pressure tap 104 via the first pipe connector 13, and the gas pressure tap 602 via the second pipe connector 14, thus simplifying the installation of the detection unit 11.

[0105] Specifically, the first connector 13 can be arranged perpendicularly to the outer wall of the premixed outer tube 1, and the second connector 14 can be arranged perpendicularly to the outer wall of the tracheal connector 6. Both the first connector 13 and the second connector 14 can be configured as convex pillars. In this embodiment, the shapes of the first connector 13 and the second connector 14 are not specifically limited.

[0106] According to an embodiment of the present invention, on the other hand, such as Figures 1 to 7 As shown, a gas-fired water heater is also provided, including a housing, a gas premixer, a gas pipe connector 6, a detection unit 11, and a controller.

[0107] Specifically, a gas proportional valve 8 (e.g., not shown in the figure) is provided inside the housing. Figure 7 (As shown).

[0108] Specifically, the gas premixer is installed inside the housing.

[0109] Specifically, in combination Figure 2 and Figure 7 As shown, one end of the gas pipe connector 6 is connected to the gas inlet 103, and the other end is connected to the gas proportional valve 8.

[0110] Specifically, such as Figure 7 As shown, the detection unit 11 is used to detect the air pressure value in the air passage 205 and the gas pressure value in the gas pipe connector 6.

[0111] Specifically, the controller is electrically connected to the detection unit 11 and the gas proportional valve 8 respectively. The controller is used to calculate the pressure difference between the air pressure value and the gas pressure value detected by the detection unit 11, compare the pressure difference value with the preset range value, and control the gas proportional valve 8 to adjust the gas flow rate according to the comparison result.

[0112] This gas-fired water heater incorporates a gas premixer within its unit. The detection unit 11 acquires real-time air pressure values ​​in the air passage 205 and gas pressure values ​​in the gas pipe connector 6, providing accurate pressure data to the controller. Based on the data from the detection unit 11, the controller calculates the pressure difference between the air and gas pressure values. It then compares the calculated pressure difference with a preset range value and controls the gas proportional valve 8 to adjust the gas flow rate based on the comparison result. This method allows for precise understanding of the actual gas and air supply, timely detection of the impact of pressure changes on the air-fuel ratio, and thus precise control of the gas proportional valve 8. This ensures that the gas and air are always maintained at the optimal mixing ratio, improving combustion efficiency and guaranteeing good combustion performance of the gas-fired water heater under various operating conditions.

[0113] Specifically, the detection unit 11 can be a pressure sensor, which can directly detect the air pressure value and the gas pressure value. The detection unit 11 can also be a differential pressure sensor, which can directly detect the pressure difference between the air pressure value and the gas pressure value. In this embodiment, the type of detection unit 11 is not specifically limited.

[0114] Specifically, the detection unit 11 can be installed on the first pipe connector 13 and the second pipe connector 14.

[0115] Specifically, the controller can be an existing controller such as a PLC (Programmable Logic Controller), a microcontroller, or a computer control system. In this embodiment, the type of controller is not specifically limited.

[0116] According to an embodiment of the present invention, on the other hand, such as Figure 7 As shown, a control method for a gas-fired water heater is also provided, including:

[0117] Based on the air pressure value and gas pressure value detected by the detection unit 11, the pressure difference between the air pressure value and the gas pressure value is calculated.

[0118] Determine whether the differential pressure value is within the preset range.

[0119] If the differential pressure value is within a preset range, the controller controls the gas proportional valve 8 to maintain the current gas flow rate. Alternatively, if the differential pressure value is outside the preset range, the controller controls the gas proportional valve 8 to adjust the gas flow rate so that the differential pressure value is within the preset range.

[0120] This gas-fired water heater's control method calculates the pressure difference between air and gas pressure and compares it to a preset range to monitor the real-time mixing ratio of gas and air. When the pressure difference is within the preset range, the controller controls the gas proportional valve 8 to maintain the current gas flow rate, ensuring a proper mixing ratio between gas and air and stabilizing the combustion process. When the pressure difference exceeds the preset range, the controller adjusts the gas proportional valve 8 to regulate the gas flow rate, bringing the pressure difference back to the normal range. This ensures optimal combustion, allowing the gas-fired water heater to adapt to various complex operating conditions and provide a stable hot water supply.

[0121] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0122] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A gas premixer, characterized in that, include: The premixed outer pipe (1) is provided with an air inlet (102) and a gas inlet (103); A premixed inner tube (2) is disposed inside the premixed outer tube (1). The outer wall of the premixed inner tube (2) and the inner wall of the premixed outer tube (1) enclose a gas chamber (203). The gas inlet (103) is connected to the inlet of the gas chamber (203). The premixed inner tube (2) is provided with a turbulence section (3), a gas mixing channel (2011) and an air channel (205). The air inlet (102) is connected to the inlet of the air channel (205). The gas mixing channel (2011) is connected to the outlet of the air channel (205) and the outlet of the gas chamber (203) respectively. At least part of the turbulence section (3) is disposed inside the gas mixing channel (2011).

2. The gas premixer according to claim 1, characterized in that: The premixed inner tube (2) includes a base (201) and a venturi tube (202) disposed on the base (201). The venturi tube (202) is provided with the air passage (205). The base (201) is provided with an outlet pipe section (12) extending away from the venturi tube (202). The outlet pipe section (12) is provided with the mixing passage (2011). The throat section (2021) of the venturi tube (202) is inserted into the outlet pipe section (12) and forms a gas outlet passage (2012) between it and the inner wall of the outlet pipe section (12). The gas chamber (203) is connected to the mixing passage (2011) through the gas outlet passage (2012).

3. The gas premixer according to claim 2, characterized in that: At least part of the turbulence section (3) is provided in the gas outlet channel (2012), and one end of the turbulence section (3) extends to the outlet of the gas outlet channel (2012) and forms a first angle with the plane where the outlet of the gas outlet channel (2012) is located, the first angle being less than 90°.

4. The gas premixer according to claim 2, characterized in that: The air inlet (102) is located at one end face of the premixed outer tube (1). The premixed outer tube (1) is provided with an outer tube body (101) and an annular protrusion (4) extending in a direction away from the air inlet (102) around the inner wall of the outer tube body (101). An annular cavity (5) communicating with the gas chamber (203) is left between the annular protrusion (4) and the inner wall of the outer tube body (101). The annular protrusion (4) near the air inlet (102) forms a first mounting step (401) for installing a sealing ring at the connection between one end and the inner wall of the outer tube (101), and a second mounting step (402) is provided on the outer wall circumference of the other end. The inlet end of the venturi tube (202) is provided with a first connecting part (204), and the first connecting part (204) and the second mounting step (402) are engaged and abutted against each other. The outer tube (101) has a third mounting step (2013) at one end near the air inlet (102), and the base (201) has a second connecting part (206), which abuts against the third mounting step (2013).

5. The gas premixer according to claim 1, characterized in that: The number of the turbulence section (3) is multiple, and each turbulence section (3) is spaced apart along the inner peripheral wall of the gas mixing channel (2011) and extends along the axial direction of the gas mixing channel (2011); the turbulence section (3) has a long strip-shaped protrusion structure, and one end of the turbulence section (3) extends to the outlet of the gas mixing channel (2011) and forms a second angle with the plane where the outlet of the gas mixing channel (2011) is located, the second angle being less than 90°.

6. The gas premixer according to any one of claims 1 to 5, characterized in that: It also includes a gas pipe connector (6) and a nozzle (7) sealed inside the gas pipe connector (6). One end of the gas pipe connector (6) is connected to the gas inlet (103), and the other end is used to connect to the gas proportional valve (8).

7. The gas premixer according to claim 6, characterized in that: The premixed outer pipe (1) has a connecting pipe section (9) on its outer wall that communicates with the gas inlet (103). The connecting pipe section (9) has a slot (901) for inserting a retaining ring (10). The outer surface of the gas pipe connector (6) has an annular groove (601) corresponding to the slot (901). The gas pipe connector (6) is embedded in the connecting pipe section (9) and inserted into the slot (901) by the retaining ring (10) to engage with the annular groove (601), so that the gas pipe connector (6) and the connecting pipe section (9) can be detachably connected.

8. The gas premixer according to claim 6, characterized in that: The premixed outer tube (1) is provided with a first pipe joint (13) on its outer wall. The first pipe joint (13) is provided with an air pressure tap (104) that communicates with the air channel (205). The axis of the air pressure tap (104) is perpendicular to the axis of the air channel (205). The outer wall of the gas pipe connector (6) is provided with a second pipe connector (14), and the second pipe connector (14) is provided with a gas pressure tapping hole (602) communicating with the inside of the gas pipe connector (6). The axis of the gas pressure tapping hole (602) is perpendicular to the axis of the gas pipe connector (6).

9. A gas-fired hot water device, characterized in that, include: The housing contains a gas proportional valve (8); The gas premixer according to any one of claims 1 to 8, wherein the gas premixer is disposed within the housing; The gas pipe connector (6) is connected at one end to the gas inlet (103) and at the other end to the gas proportional valve (8); The detection unit (11) is used to detect the air pressure value in the air channel (205) and the gas pressure value in the gas pipe connector (6); The controller is electrically connected to the detection unit (11) and the gas proportional valve (8) respectively. It is used to calculate the pressure difference between the air pressure value and the gas pressure value based on the air pressure value and the gas pressure value detected by the detection unit (11), compare the pressure difference value with a preset range value, and control the gas proportional valve (8) to adjust the gas flow rate according to the comparison result.

10. A control method for a gas-fired hot water device, characterized in that, The method using the gas-fired hot water equipment as described in claim 9 includes: Based on the air pressure value and the gas pressure value detected by the detection unit (11), the pressure difference between the air pressure value and the gas pressure value is calculated; Determine whether the differential pressure value is within the preset range. Based on the differential pressure value being within the preset range, the controller controls the gas proportional valve (8) to maintain the current gas flow rate; or based on the differential pressure value being outside the preset range, the controller controls the gas proportional valve (8) to adjust the gas flow rate so that the differential pressure value is within the preset range.

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