Full premix burner and its main heat exchanger

Abstract

The present invention discloses a full premix burner and a main heat exchanger thereof, comprising an inner shell, a premixing chamber and a combustion chamber respectively arranged in the inner shell, wherein the premixing chamber is configured to include: a matching spiral air supply pipe I connected to an external air pipeline; a spiral air supply pipe II connected to a gas pipeline; a mixing inner cover arranged at the air supply ends of the spiral air supply pipe I and the spiral air supply pipe II; and a mixing outer cover for delivering the gas in the mixing inner cover to the combustion chamber; wherein corresponding conical air supply holes I are respectively arranged at the relative positions at the tops of the spiral air supply pipe I and the spiral air supply pipe II; and the mixing inner cover is provided with a conical surface for turning back the air flow in the air supply hole's air flow extension direction. The present invention provides a full premix burner and a main heat exchanger thereof, wherein the air supply capacity and premixing effect of the premixing chamber thereof are more significant than those of the prior art, and can be widely applied to industrial or large-volume heating situations.

Description

Technical Field

[0001] The present invention relates to the field of burners, and more particularly to a full premix burner and a main heat exchanger thereof. Background Art

[0002] Among the existing gas water heaters, according to the combustion mode of gas, especially the different mixing ratios of air and gas, they can be divided into full premixed combustion models and partial premixed combustion models. Generally speaking, the full premixed condensing heat exchanger adopts an integrated design, and no longer distinguishes between the main heat exchanger and the condensing heat exchanger. The entire heat exchange process is completed by one heat exchanger. The operating principle of the full premixed condensing furnace is: the gas enters the premixing chamber through the gas control proportional valve, and the air enters the premixing chamber inside the furnace through the outer shaft of the balanced chimney. The gas and air are mixed in the premixing chamber and then enter the fan. The fan rotates to send the mixed gas of gas and air to the combustion chamber of the main heat exchanger for combustion. After combustion, high-temperature flue gas is generated, and heat exchange is completed in the main heat exchanger. The heating channel sends the heat to the room, and the flue gas is discharged to the outside through the inner shaft of the balanced chimney.

[0003] The full premix burner is installed in the main heat exchanger to achieve full premixing of gas and air in proportion before the mixed gas is burned. The combustion speed of the full premix burner is not limited by the mixing time and mixing space. It has the advantages of fast combustion speed, instant combustion of the mixed gas after leaving the burner fire hole, full combustion, low nitrogen oxide emission, low noise, etc. It has been used more and more, especially in condensing water heaters and condensing heating furnaces.

[0004] The existing burners have the following disadvantages:

[0005] 1. The premixing chamber structure is unreasonable. When there is insufficient gas or a large demand for gas supply, its premixing capacity and gas supply flow rate will be limited, resulting in the volumetric thermal strength failing to meet the use requirements;

[0006] 2. In the prior art, a large part of the heat generated by the main heat exchanger during the combustion process is concentrated in the combustion chamber, and the heat exchange tubes of the existing combustion chamber are arranged outside the combustion chamber. This contact method cannot achieve good heat exchange, resulting in a large heat loss. In addition, the heat in the combustion chamber becomes more and more concentrated over time, affecting the service life and overall use effect of the equipment.

[0007] 3. In the prior art, each chamber in the main heat exchanger adopts an integrated design, so when problems occur in the components of the equipment, there is no way to promptly perform maintenance and targeted equipment replacement, which significantly increases maintenance costs.

[0008] 4. In the prior art, scale will be generated inside the water pipe of the main heat exchanger during long-term use. The prior art does not have the effect of removing this scale, so that the heat transfer effect of the equipment in the later stage of use will be limited by the scale, and the service life of the water pipe will be affected.

[0009] 5. In the prior art, a large amount of cold water usually flows out of the main heat exchanger at the beginning of its use. For industrial heating or large-scale heating, the cold water period at the front end is longer, which affects its use effect. Summary of the invention

[0010] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0011] In order to achieve these objects and other advantages of the present invention, a full premix burner is provided, comprising an inner shell, a premixing chamber and a combustion chamber respectively arranged in the inner shell, wherein the premixing chamber is configured to include:

[0012] A matching spiral air supply pipe I connected to an external air pipeline;

[0013] Spiral gas supply pipe II connected to the gas pipeline;

[0014] A mixing inner cover arranged at the air supply end of the spiral air supply pipe I and the spiral air supply pipe II;

[0015] The gas released from the mixing inner cover is sent to the mixing outer cover of the combustion chamber;

[0016] Wherein, corresponding conical air supply holes I are respectively arranged at the relative positions at the tops of the spiral air supply pipes I and II;

[0017] The mixing inner cover is provided with a conical surface for turning back the airflow in the airflow extension direction of the air supply hole I, and the bottom of the mixing inner cover is provided with at least one circle of conical air supply holes II or air supply grilles.

[0018] Preferably, the mixing housing is provided with a passive impeller on one side cooperating with the combustion chamber;

[0019] The outer structure of the mixing cover decreases along the gas transmission direction thereof.

[0020] Preferably, the combustion chamber is configured to include:

[0021] A gas distribution member disposed inside the combustion box and communicated with the premixing chamber;

[0022] A combustion assembly disposed on the periphery of the gas distribution member;

[0023] An ignition mechanism that cooperates with the combustion assembly;

[0024] Wherein, the side wall of the combustion box is provided with a spiral groove for accommodating the pipeline;

[0025] The outer structures of the gas distribution component and the combustion assembly are adapted to the outer structure of the inner shell;

[0026] The gas distribution member is a cover-type structure, and a plurality of groups of distribution holes of different diameters are arranged on its side wall;

[0027] The combustion assembly is configured to include:

[0028] An anti-flashback inner layer, a combustion middle layer, and a combustion stabilizing outer layer are respectively arranged on the outside of the gas distribution member and have ventilation gaps, and the ignition mechanism is arranged in the combustion middle layer;

[0029] The anti-tempering inner layer is provided with anti-tempering circular holes and strip holes I;

[0030] The combustion middle layer and the combustion stabilizing outer layer are respectively provided with strip holes II and strip holes III, and the apertures of the strip holes I, II and III are all smaller than the aperture of the anti-backfire circular hole, and the lengths of the strip holes I, II and III increase successively.

[0031] A main heat exchanger of a full premix burner, further comprising: a modular heat exchange chamber, a condensation chamber, a smoke collecting chamber arranged at the upper end of the full premix burner, and a housing for integrating the components;

[0032] The heat exchange box of the heat exchange chamber has multiple layers of grid-type heat exchange layers, each heat exchange layer of adjacent layers includes at least two layers of grid structures in space, the grids of each layer are staggered in space, and heat exchange tubes II are arranged between adjacent grids of the same layer;

[0033] The water inlet and outlet ends of each layer of heat exchange tube II are connected to the heat exchange tube group through the corresponding branch pipe I.

[0034] Preferably, the condensation chamber comprises:

[0035] A condensing shell, on the inner side wall of which is provided at least one spirally arranged flat heat exchange element;

[0036] Each flat heat exchange element is connected to the heat exchange tube group through a matching branch pipe II.

[0037] Preferably, the shell is double-layered, and the cavities of the two shells are separated by partitions to obtain a vacuum layer and a heat-insulating layer.

[0038] Preferably, the heat exchange tube group comprises:

[0039] A main water inlet pipe connected to an external water supply unit, on which a flow valve is provided;

[0040] A main water outlet pipe connected to an external heating unit;

[0041] The main water inlet pipe is connected to the water inlet side of the heat exchange tube I spirally arranged outside the combustion chamber, the heat exchange tube II in the heat exchange chamber, and the flat heat exchange element of the condensing chamber through the corresponding quick connector I and valve I, and the main water outlet pipe is connected to the water outlet side of the heat exchange tube I spirally arranged outside the combustion chamber, the heat exchange tube II in the heat exchange chamber, and the flat heat exchange element of the condensing chamber through the corresponding quick connector II and valve II;

[0042] The heat exchange tube I, the heat exchange tube II and the flat heat exchange element are connected through an arc-shaped transition tube, and a valve III is arranged on the arc-shaped transition tube.

[0043] Preferably, it also includes:

[0044] A medicine adding box connected to the water inlet end of the main water inlet pipe through valve IV, tap I and valve V, wherein a water pump and a liquid level sensor are arranged;

[0045] A sewage pipe connected to the outlet end of the main outlet pipe through valve VI, tap II, and valve VII;

[0046] Wherein, the main water outlet pipe is connected to the medicine adding box through the tap III and valve VIII;

[0047] A matching valve IX is provided between the tap III and the tap II;

[0048] The sewage pipe and the water outlet are respectively provided with a matching pressure sensor I and a pressure sensor II, and the tap III is provided with a temperature sensor at a position matching the main water outlet pipe;

[0049] Corresponding flow valves I and II are respectively arranged between the water inlet end and valve V, and between valve V and the medicine adding box.

[0050] Preferably, the working mode of the main heat exchanger includes:

[0051] S11. When the main heat exchanger is initially working, close valve IV, valve IX, valve VIII, valve III between the heat exchange chamber and the condensation chamber, and valves I and II at both ends of the flat heat exchange element, so that the water output from the main water inlet pipe is simultaneously transported to the combustion chamber and the heat exchange chamber in parallel;

[0052] S12, when the pressure sensor II detects the pressure and the water level of the liquid level sensor reaches the preset maximum value, the valve V is closed, the valve IV and valve VIII are opened, and the hot water is circulated to the dosing tank through the water pump for secondary heating;

[0053] S13, the temperature sensor detects the water temperature in real time. When the water temperature reaches a predetermined value, valve VII is opened, valve VI is closed, water is supplied to the outside through the outlet end of the main outlet pipe, and valve V is opened at the same time to adjust the flow of flow valves I and II to adjust the water temperature in the outlet pipe;

[0054] S14, the liquid level sensor detects the water level of the dosing tank in real time. When it is lower than the preset value, valves IV and VIII are closed to adjust the flow of flow valve I;

[0055] The temperature sensor detects the water temperature in real time. When the temperature is lower than the preset value, all valves III are opened, and only valve I at the front of the combustion chamber and valve II at the back of the condensation chamber are opened, so that each chamber is in a series delivery mode;

[0056] When the temperature is higher than the preset value, close valve VIII, open valves I and II, and put each chamber in parallel delivery mode.

[0057] Preferably, the descaling method of the main heat exchanger includes:

[0058] S21, input water into the dosing tank through valve control, and when the water volume in the water tank meets the predetermined requirement, close the water inlet end, and add a predetermined amount of medicine into the dosing chamber through the dosing module to form a mixed liquid;

[0059] S22, through valve control, keep the condensation chamber not connected with other mechanisms, the combustion chamber and the heat exchange chamber are only connected with the water inlet end, and the mixed liquid is transported to the combustion chamber and the heat exchange chamber to react for a predetermined time to remove scale;

[0060] S23, through valve control, the combustion chamber and the heat exchange chamber are connected only to the main water outlet pipeline, and the slag-containing solution after the reaction is discharged to the outside, and S22-S23 are repeated one or two times;

[0061] S24, adding a predetermined amount of water into the dosing chamber through a water adding module through valve control to obtain a diluent;

[0062] S25, through valve control, the combustion chamber and the heat exchange chamber are not connected to other mechanisms, the condensation chamber is only connected to the water inlet end, and the dilution liquid is transported to the condensation chamber to react for a predetermined time to remove scale;

[0063] S26, through valve control, the condensation chamber is connected only to the main water outlet pipeline, and the slag-containing solution after the reaction is discharged to the outside, and S25-S26 are repeated one or two times;

[0064] S27. Water is input into the dosing tank through valve control. When the water volume in the water tank meets the predetermined requirement, the combustion chamber, heat exchange chamber and condensation chamber connected in parallel are flushed. After the predetermined flushing time, the water is discharged to the outside. The cleaning is repeated one or two times to complete the descaling process.

[0065] The present invention includes at least the following beneficial effects: First, by designing the structure of the premixing chamber, the present invention makes the air supply capacity and premixing effect of the premixing chamber more significant than those of the prior art, and can be widely applied to industrial or large-scale heating situations.

[0066] Secondly, the present invention adopts a modular design so that each chamber has an independent packaging shell. When used, the working state of each chamber can be controlled separately as needed, and the working mode of each chamber can be switched to parallel or series, making its working mode more diversified and adaptable to different heating scenarios and heating needs.

[0067] Thirdly, the present invention adopts a modular design so that the piping structure of each chamber can be designed separately to meet the exchange needs of different positions and different heat.

[0068] Fourthly, the modular design of the present invention enables it to perform descaling work compared to the prior art to ensure that the service life and heating efficiency of the equipment can meet the use requirements.

[0069] Fifthly, the modular design of the present invention allows its working mode to be adjusted accordingly compared with the prior art, and it can achieve constant heat heating in the initial stage of water supply, thereby ensuring its use effect and improving the user experience.

[0070] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 A schematic diagram of the internal structure of a premixing chamber in one embodiment of the present invention;

[0072] Figure 2 It is a schematic diagram of the internal cross-sectional structure of the premixing chamber in another embodiment of the present invention;

[0073] Figure 3 A schematic diagram of the structure of a premixing chamber in one embodiment of the present invention;

[0074] Figure 4 A schematic cross-sectional view of a combustion box in one embodiment of the present invention;

[0075] Figure 5 It is a schematic diagram of the structure of the combustion assembly and the mounting plate in one embodiment of the present invention;

[0076] Figure 6 It is a cross-sectional structural diagram of the gas distribution component, the combustion assembly and the mounting plate in one embodiment of the present invention;

[0077] Figure 7 A schematic diagram of the structure of a gas distribution component in one embodiment of the present invention;

[0078] Figure 8 It is a schematic diagram of the structure of the anti-tempering inner layer in one embodiment of the present invention;

[0079] Fig. 9 It is a schematic diagram of the structure of the combustion middle layer in one embodiment of the present invention;

[0080] Fig.10 A schematic diagram of the structure of the burning outer layer in one embodiment of the present invention;

[0081] Fig.11 A schematic diagram of the layout structure of a main burner in one embodiment of the present invention;

[0082] Fig.12 It is a schematic structural diagram of a heat exchange layer in one embodiment of the present invention;

[0083] Fig.13 It is a schematic structural diagram of a flat heat exchange element in one embodiment of the present invention;

[0084] Fig.14 It is a schematic cross-sectional structure diagram of a flat heat exchange element in one embodiment of the present invention;

[0085] Fig.15 It is a schematic diagram of the layout of the heat exchange tube group and each chamber in one embodiment of the present invention. DETAILED DESCRIPTION

[0086] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0087] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0088] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the term is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "Ⅰ" and "Ⅱ" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0089] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] A fully premixed burner, such as Figure 1-3 , comprising an inner shell, a premixing chamber 1 and a combustion chamber 2 respectively arranged in the inner shell, wherein the premixing chamber 1 is configured to include:

[0091] A matching spiral air delivery pipe Ⅰ10 communicated with an external air pipeline;

[0092] The spiral gas supply pipe II11 connected to the gas pipeline has the advantage of increasing the flow rate through the spiral structure design;

[0093] The mixing inner cover 12 is arranged at the air supply end of the spiral air supply pipe Ⅰ10 and the spiral air supply pipe Ⅱ11, and is used to fully mix the two media;

[0094] The gas released from the mixing inner cover 12 is sent to the mixing outer cover 13 of the combustion chamber, which is used to send the mixed gas to the combustion chamber through the gas delivery pipeline 17 connected thereto, so as to realize the connection between the structural parts;

[0095] The spiral air delivery pipes Ⅰ10 and Ⅱ11 are provided with corresponding conical air delivery holes Ⅰ14 at the relative positions at the top. In practical applications, when the medium with increased flow rate is delivered to the outside, its gas outlet surface is reduced, so that its flow rate is further increased. At the same time, this relative arrangement makes the two gases correspond to each other in space, and the gases sprayed out intersect in space and are preliminarily mixed at the intersection.

[0096] The mixing inner cover 12 is provided with a conical surface 15 for turning back the airflow in the airflow extension direction of the air supply hole. The bottom of the mixing inner cover 12 is provided with at least one circle of conical air supply holes II or air supply grilles 16. The air supply grilles 16 can be arranged on four sides or on two opposite sides as needed. The conical air supply holes II need to be arranged on four sides and arranged in multiple circles as needed. In this scheme, the gas preliminarily mixed at the intersection advances at a certain flow rate. Under the action of the conical surface, the gas with a predetermined flow rate is turned back. At the same time, the turned back gas is limited by space and stroke and still has a certain flow rate. It can be reunited after the turn. At the same time, the continuously input gas moves downward under the condition of increasing airflow velocity and gas, and is released outward from the air supply grille. The released gas is transported outward under the action of the mixing outer cover to achieve a small pressure and high flow rate air supply mode.

[0097] like Figure 3 Furthermore, the mixing housing 13 is provided with a passive impeller (not shown) on one side cooperating with the combustion chamber. The impeller rotates through the passive effect of the gas passing through, which can reduce the safety hazards caused by the electronic products in the equipment and can also further improve the work;

[0098] The outer structure of the mixing cover 13 decreases along the air delivery direction thereof so as to be connected to the air delivery pipeline 17 communicating with the outside to the combustion chamber.

[0099] like Figure 4-Figure 10 , further, the combustion chamber 2 is configured to include:

[0100] A gas distribution member 21 disposed inside the combustion box 20 and communicating with the premixing chamber;

[0101] The combustion assembly 22 is arranged on the periphery of the gas distribution member, the gas distribution member 21 and the combustion assembly 22 are integrated into an integral structure through a mounting plate 26, and the mounting plate 26 is provided with a mounting groove (not shown) matched with the gas distribution member 21 and the combustion assembly 22, and the mounting plate 26 is provided with an air inlet 261 matched with the premixing chamber;

[0102] an ignition mechanism (not shown) cooperating with the combustion assembly;

[0103] The side wall of the combustion box has a spiral groove 23 for accommodating the pipeline. This structural setting effectively increases the contact area between the combustion box and the external heat exchange tube I 24 compared to the existing coiled structure, and can more effectively exchange heat. At the same time, this structural setting makes it easier to assemble the segmented pipeline compared to the existing technology, and the spiral groove 23 can provide preliminary positioning during assembly.

[0104] The outer structure of the gas distribution component and the combustion assembly is adapted to the outer structure of the inner shell. This structural design allows the combustion chamber to be arranged in a square or cylindrical shape to match different installation spaces and different application needs according to different application requirements;

[0105] The gas distributor is a shell-like structure, and a plurality of distribution holes 210 of different diameters are arranged on its side wall, which are evenly distributed on the periphery for evenly distributing the mixed gas to ensure that the gas velocity at each point under the minimum load is greater than the combustion velocity, so that the mixed gas burns sufficiently evenly, and there is a ventilation gap between the gas distributor and the combustion assembly;

[0106] The combustion assembly is configured to include:

[0107] An anti-flashback inner layer 220, a combustion middle layer 221, and a combustion stabilizing outer layer 222 are respectively arranged on the outside of the gas distribution member and have ventilation gaps, and the ignition mechanism is arranged in the combustion middle layer;

[0108] The anti-tempering inner layer 220 is provided with anti-tempering circular holes 2201 and strip holes I 2202;

[0109] The combustion middle layer 221 and the combustion stabilizing outer layer 222 are respectively provided with strip holes II 2210 and strip holes III 2220, and the apertures of the strip holes I 2202, II 2210 and III 2220 are all smaller than the aperture of the anti-tempering circular hole 2201. The lengths of the strip holes I 2202, II 2210 and III 2220 are increased in sequence. This scheme adopts the design of multi-layer structure, hole structure and size, so that each layer has different functionality to adapt to the general The multi-layer design can meet the heating needs. At the same time, compared with the existing method of arranging all the holes on one layer, the combustion surface of the mixed gas is larger and the combustion is more complete. The combustion is mainly carried out on the combustion middle layer 221. The anti-flashback circular holes 2201 and the strip holes Ⅰ2202 on the anti-flashback inner layer 220 are designed to prevent flashback. The reason is that the aperture of each strip hole is smaller than the aperture of the anti-flashback circular hole 2201, and the structure of the stable combustion outer layer 222 is mainly used to stabilize the combustion and prevent flameout.

[0110] like Figure 11-Figure 12 , a main heat exchanger of a full premix burner, further comprising: a modular heat exchange chamber 3, a condensation chamber 4, a smoke collecting chamber 5 arranged at the upper end of the full premix burner, and a shell 6 for integrating the components, wherein the shell 6 is a double-layer arrangement, and the cavities of the two are separated by a partition to obtain a vacuum layer and a heat preservation layer;

[0111] The heat exchange box of the heat exchange chamber has a multi-layer grid-type heat exchange layer 30, and each heat exchange layer 30 of adjacent layers includes at least two layers of structures with grids 31 in space. The grids 31 of each layer are staggered in space, and heat exchange tubes II 32 are arranged between adjacent grids of the same layer;

[0112] The water inlet and outlet ends of each layer of heat exchange tube II are connected to the heat exchange tube group 7 through the corresponding branch pipe I (not shown). In actual applications, the flue gas after combustion is discharged to the heat exchange chamber through the combustion chamber. In the prior art, there are two heat exchange modes in the heat exchange chamber. One is that the flue gas does not directly contact the heat exchange tube group, and the heat transfer of the shell is used to heat the fluid in the heat exchange tube group. However, this setting method has a low heat utilization rate. The other is to absorb heat through the heating fins and then transfer the heat to the heat exchange tube group. However, the design of the heating fins in this method is complicated, and the flow of the flue gas is uncontrollable, so the heat exchange efficiency is not up to the requirement. The present invention improves the heat transfer efficiency by using a multi-layer grid-type heat exchanger. The heat exchange layer is structurally designed so that, compared with the prior art, a part of the flue gas flowing upward can directly contact the heat exchange tube II 32 to achieve heat exchange, and merge with another part of the flue gas after deflection, and transport it upward through the design of the grille, while partially transferring the heat to the grille, thereby increasing the flow path of the flue gas. At the same time, through the staggered design, it can obtain more effective heat exchange performance. In actual applications, the grille is arranged as an inclined structure, and a wavy structure perpendicular to the flow direction is arranged on the side wall, which can increase the contact surface while quantitatively controlling the flow speed, direction, etc. of the flue gas so that it can better achieve heat exchange.

[0113] like Figure 13-Figure 14 , further, the condensation chamber 4 comprises:

[0114] A condensation shell (not shown), on the inner wall of which is provided at least one spirally arranged flat heat exchange element 40;

[0115] Each flat heat exchanger 40 is connected to the heat exchange tube group 7 through a matching branch pipe (not shown) Ⅱ. In this scheme, the heat exchange device in the condensation chamber 4 is arranged into a flat structure, which serves to increase the heat exchange area. At the same time, it also makes the spatial thickness of the water flow smaller and heats faster. At the same time, multiple spirally arranged flat heat exchangers 40 make the flue gas flow spirally upward. While ensuring the flow rate, the flow path can be extended. The flue gas flow mode at the center of the spirally arranged flat heat exchanger 40 is compared with the periphery. Its flow mode will also be adjusted, so that its overall heat exchange mode can be better increased.

[0116] like Fig.11 , Fig.15 As shown, further, the heat exchange tube group 7 includes:

[0117] A main water inlet pipe 71 connected to an external water supply unit, on which a flow valve I 710 is provided;

[0118] A main water outlet pipe 72 communicating with an external heating unit;

[0119] The main water inlet pipe is connected to the water inlet side of the heat exchange tube I24 arranged spirally outside the combustion chamber 2, the heat exchange tube II32 in the heat exchange chamber 3, and the flat heat exchange element 41 of the condensing chamber 4 through the corresponding quick connector I711 and valve I712, and the main water outlet pipe 72 is connected to the water outlet side of the heat exchange tube I24 arranged spirally outside the combustion chamber 2, the heat exchange tube II32 in the heat exchange chamber 3, and the flat heat exchange element 41 of the condensing chamber 4 through the corresponding quick connector II721 and valve II722;

[0120] The heat exchange tube I 24, the heat exchange tube II 32, and the flat heat exchange element 41 are connected through an arc-shaped transition tube 74, and a valve III 740 is provided on the arc-shaped transition tube. In this solution, corresponding independent water pipes and corresponding valves are respectively provided in each modular structure, so that the working mode and working state of each module can be directly realized by switching the corresponding valve, which is also convenient for independent maintenance and replacement of each module in the later stage.

[0121] like Fig.15 As shown, further, it also includes:

[0122] A dosing box 75 is connected to the water inlet end 77 of the main water inlet pipe through a valve IV 750, a tap I 713, and a valve V 714, wherein a water pump 751 and a liquid level sensor 752 are arranged, and a flow valve II 753 is also arranged between the dosing box 75 and the tap I 715;

[0123] A sewage pipe 73 connected to the water outlet end 76 of the main water outlet pipe 72 through a valve VI 730, a tap II 731, and a valve VII 732;

[0124] The main water outlet pipe 72 is connected to the medicine adding box 75 through the tap III 723 and the valve VIII 724;

[0125] A matching valve IX 725 is provided between the tap III 723 and the tap II 731;

[0126] The tap III 723 is provided with a matching pressure sensor 726 and a temperature sensor 727 at a position close to each chamber;

[0127] Corresponding flow valves I715 and II753 are respectively arranged between the water inlet end 77 and valve V714, and between valve IV750 and the dosing box. In this solution, the design of taps, valves and sensors allows the working mode of each part to be controlled by a program. Compared with the prior art, the overall controllability is better. At the same time, the dosing box 75 can play two roles. One is to temporarily store the medium during the initial heating period and when adjusting the water temperature. It can also be used as a drug regulating box when cleaning the water pipes in the later stage to circulate the cleaning solution for storage and rotation, so as to complete the cleaning and / or descaling operations of each module.

[0128] Furthermore, the working mode of the main heat exchanger includes:

[0129] S11. When the main heat exchanger is initially working, close valve IV, valve IX, valve VIII, valve III between the heat exchange chamber and the condensation chamber, and valves I and II at both ends of the flat heat exchange element, so that the water output from the main water inlet pipe is simultaneously transported to the combustion chamber and the heat exchange chamber in parallel;

[0130] S12, when the pressure sensor II detects the pressure and the water level of the liquid level sensor reaches the preset maximum value, the valve V is closed, the valve IV and valve VIII are opened, and the hot water is circulated to the dosing tank through the water pump for secondary heating;

[0131] S13, the temperature sensor detects the water temperature in real time. When the water temperature reaches a predetermined value, valve VII is opened, valve VI is closed, water is supplied to the outside through the outlet end of the main outlet pipe, and valve V is opened at the same time to adjust the flow of flow valves I and II to adjust the water temperature in the outlet pipe;

[0132] S14, the liquid level sensor detects the water level of the dosing tank in real time. When it is lower than the preset value, valves IV and VIII are closed to adjust the flow of flow valve I;

[0133] The temperature sensor detects the water temperature in real time. When the temperature is lower than the preset value, all valves III are opened, and only valve I at the front of the combustion chamber and valve II at the back of the condensation chamber are opened, so that each chamber is in a series delivery mode;

[0134] When the temperature is higher than the preset value, valve III is closed, valve I and valve II are opened, and each chamber is in a parallel delivery mode. The modular design of the present invention allows its working mode to be adjusted accordingly compared with the prior art, and it can achieve fixed heat heating in the early stage of water supply, ensuring its use effect and improving the user experience.

[0135] Furthermore, the descaling method of the main heat exchanger includes:

[0136] S21, input water into the dosing tank through valve control, and when the water volume in the water tank meets the predetermined requirement, close the water inlet end, and add a predetermined amount of medicine into the dosing chamber through the dosing module to form a mixed liquid;

[0137] S22, through valve control, keep the condensation chamber not connected with other mechanisms, the combustion chamber and the heat exchange chamber are only connected with the water inlet end, and the mixed liquid is transported to the combustion chamber and the heat exchange chamber to react for a predetermined time to remove scale;

[0138] S23, through valve control, the combustion chamber and the heat exchange chamber are connected only to the main water outlet pipeline, and the slag-containing solution after the reaction is discharged to the outside, and S22-S23 are repeated one or two times;

[0139] S24, adding a predetermined amount of water into the dosing chamber through a water adding module through valve control to obtain a diluent;

[0140] S25, through valve control, the combustion chamber and the heat exchange chamber are not connected to other mechanisms, the condensation chamber is only connected to the water inlet end, and the dilution liquid is transported to the condensation chamber to react for a predetermined time to remove scale;

[0141] S26, through valve control, the condensation chamber is connected only to the main water outlet pipeline, and the slag-containing solution after the reaction is discharged to the outside, and S25-S26 are repeated one or two times;

[0142] S27, through valve control, input water into the medicine adding box, and when the water volume in the water tank meets the predetermined requirements, flush the parallel combustion chamber, heat exchange chamber, and condensation chamber, and discharge them outward after the predetermined flushing time, repeat the cleaning one or two times, and complete the descaling process. The present invention uses modular design to make each chamber have an independent packaging shell. When used, the working state of each chamber can be controlled separately as needed, and the working mode of each chamber can be switched to parallel or series, so that its working mode is more diversified and can adapt to different descaling needs. This scheme is just an enumeration of one of the automatic descaling methods. In actual application, the user can use the operation panel on the external shell to adjust the dosage, adjust the descaling mode to descaling one by one, or only perform designated descaling operations on other modules as needed. At the same time, it can also be set to descaling by period or manually designated descaling, etc., to meet the needs of different work scenes such as industry and home use.

[0143] The above solution is only an illustration of a preferred embodiment, but is not limited thereto. When implementing the present invention, appropriate replacement and / or modification can be performed according to user needs.

[0144] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0145] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A full premix burner, comprising an inner shell, a premixing chamber and a combustion chamber respectively arranged in the inner shell, characterized in that: The premixing chamber is configured to include: A matching spiral air supply pipe I connected to an external air pipeline; Spiral gas supply pipe II connected to the gas pipeline; A mixing inner cover arranged at the air supply end of the spiral air supply pipe I and the spiral air supply pipe II; Sending the gas in the mixing inner hood into the mixing outer hood of the combustion chamber; Wherein, corresponding conical air supply holes I are respectively arranged at the relative positions at the tops of the spiral air supply pipes I and II; The mixing inner cover is provided with a conical surface for turning back the airflow in the airflow extension direction of the air supply hole I, and the bottom of the mixing inner cover is provided with at least one circle of conical air supply holes II or air supply grilles; The mixing housing is provided with a passive impeller on one side matching the combustion chamber; The outer structure of the mixing cover decreases along the gas conveying direction; The combustion chamber is configured to include: A gas distribution member disposed inside the combustion box and communicated with the premixing chamber; A combustion assembly disposed on the periphery of the gas distribution member; An ignition mechanism that cooperates with the combustion assembly; Wherein, the side wall of the combustion box is provided with a spiral groove for accommodating the pipeline; The outer structures of the gas distribution component and the combustion assembly are adapted to the outer structure of the inner shell; The gas distribution member is a cover-type structure, and a plurality of groups of distribution holes of different diameters are arranged on its side wall; The combustion assembly is configured to include: An anti-flashback inner layer, a combustion middle layer, and a combustion stabilizing outer layer are respectively arranged on the outside of the gas distribution member and have ventilation gaps, and the ignition mechanism is arranged in the combustion middle layer; The anti-tempering inner layer is provided with anti-tempering circular holes and strip holes I; The combustion middle layer and the combustion stabilizing outer layer are respectively provided with strip holes II and strip holes III, and the apertures of the strip holes I, II and III are all smaller than the aperture of the anti-backfire circular hole, and the lengths of the strip holes I, II and III increase successively.

2. A main heat exchanger using the full premix burner as claimed in claim 1, characterized in that: Also includes: The modular heat exchange chamber, condensation chamber, and smoke collection chamber arranged at the upper end of the full premix burner are used to integrate the various components into one housing; The heat exchange box of the heat exchange chamber has multiple layers of grid-type heat exchange layers, each heat exchange layer of adjacent layers includes at least two layers of grid structures in space, the grids of each layer are staggered in space, and heat exchange tubes II are arranged between adjacent grids of the same layer; The water inlet and outlet ends of each layer of heat exchange tube II are connected to the heat exchange tube group through the corresponding branch pipe I.

3. The main heat exchanger according to claim 2, characterized in that The condensation chamber comprises: A condensing shell, on the inner side wall of which is provided at least one spirally arranged flat heat exchange element; Each flat heat exchange element is connected to the heat exchange tube group through a matching branch pipe II.

4. The main heat exchanger according to claim 2, characterized in that The shell is double-layered, and the cavities of the two layers are separated by partitions to obtain a vacuum layer and a heat-insulating layer.

5. The main heat exchanger according to claim 3, characterized in that The heat exchange tube group comprises: A main water inlet pipe connected to an external water supply unit, on which a flow valve is provided; A main water outlet pipe connected to an external heating unit; The main water inlet pipe is connected to the water inlet side of the heat exchange tube I spirally arranged outside the combustion chamber, the heat exchange tube II in the heat exchange chamber, and the flat heat exchange element of the condensing chamber through the corresponding quick connector I and valve I, and the main water outlet pipe is connected to the water outlet side of the heat exchange tube I spirally arranged outside the combustion chamber, the heat exchange tube II in the heat exchange chamber, and the flat heat exchange element of the condensing chamber through the corresponding quick connector II and valve II; The heat exchange tube I, the heat exchange tube II and the flat heat exchange element are connected through an arc-shaped transition tube, and a valve III is arranged on the arc-shaped transition tube.

6. The main heat exchanger according to claim 5, characterized in that Also includes: A medicine adding box connected to the water inlet end of the main water inlet pipe through valve IV, tap I and valve V, wherein a water pump and a liquid level sensor are arranged; A sewage pipe connected to the outlet end of the main outlet pipe through valve VI, tap II, and valve VII; Wherein, the main water outlet pipe is connected to the medicine adding box through the tap III and valve VIII; A matching valve IX is provided between the tap III and the tap II; The sewage pipe and the water outlet are respectively provided with a matching pressure sensor I and a pressure sensor II, and the tap III is provided with a temperature sensor at a position matching the main water outlet pipe; Corresponding flow valves I and II are respectively arranged between the water inlet end and valve V, and between valve V and the medicine adding box.

7. The main heat exchanger according to claim 6, characterized in that The working mode of the main heat exchanger includes: S11. When the main heat exchanger is initially working, close valve IV, valve IX, valve VIII, valve III between the heat exchange chamber and the condensation chamber, and valves I and II at both ends of the flat heat exchange element, so that the water output from the main water inlet pipe is simultaneously transported to the combustion chamber and the heat exchange chamber in parallel; S12, when the pressure sensor II detects the pressure and the water level of the liquid level sensor reaches the preset maximum value, the valve V is closed, the valve IV and valve VIII are opened, and the hot water is circulated to the dosing tank through the water pump for secondary heating; S13, the temperature sensor monitors the water temperature in real time. When the water temperature reaches a predetermined value, valve VII is opened, valve VI is closed, water is supplied to the outside through the outlet end of the main outlet pipe, and valve V is opened at the same time to adjust the flow of flow valves I and II to adjust the water temperature in the outlet pipe; S14, the liquid level sensor detects the water level of the dosing tank in real time. When it is lower than the preset value, valves IV and VIII are closed to adjust the flow of flow valve I; The temperature sensor detects the water temperature in real time. When the temperature is lower than the preset value, all valves III are opened, and only valve I at the front of the combustion chamber and valve II at the back of the condensation chamber are opened, so that each chamber is in a series delivery mode; When the temperature is higher than the preset value, valve III is closed, and valves I and II are opened, so that each chamber is in a parallel delivery mode.

8. The main heat exchanger according to claim 6, characterized in that The descaling method of the main heat exchanger includes: S21, input water into the dosing tank through valve control, and when the water volume in the water tank meets the predetermined requirement, close the water inlet end, and add a predetermined amount of medicine into the dosing chamber through the dosing module to form a mixed liquid; S22, through valve control, keep the condensation chamber not connected with other mechanisms, the combustion chamber and the heat exchange chamber are only connected with the water inlet end, and the mixed liquid is transported to the combustion chamber and the heat exchange chamber to react for a predetermined time to remove scale; S23, through valve control, the combustion chamber and the heat exchange chamber are connected only to the main water outlet pipeline, and the slag-containing solution after the reaction is discharged to the outside, and S22-S23 are repeated one or two times; S24, adding a predetermined amount of water into the dosing chamber through a water adding module through valve control to obtain a diluent; S25, through valve control, the combustion chamber and the heat exchange chamber are not connected to other mechanisms, the condensation chamber is only connected to the water inlet end, and the dilution liquid is transported to the condensation chamber to react for a predetermined time to remove scale; S26, through valve control, the condensation chamber is connected only to the main water outlet pipeline, and the slag-containing solution after the reaction is discharged to the outside, and S25-S26 are repeated one or two times; S27. Water is input into the dosing tank through valve control. When the water volume in the water tank meets the predetermined requirement, the combustion chamber, heat exchange chamber and condensation chamber connected in parallel are flushed. After the predetermined flushing time, the water is discharged to the outside. The cleaning is repeated one or two times to complete the descaling process.

Images