Combustor single body, combustor and gas water heating device
By introducing a second premixing chamber and counter-combustion technology into the burner unit, the problems of unstable flame and high height are solved, and the stability of the burner and the life of the heat exchanger are improved.
Patent Information
- Application Number
- CN202422646762.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-10-31
AI Technical Summary
Existing burners have problems with unstable flame combustion and high flame height, which leads to high CO content in the flue gas, loud combustion noise and short heat exchanger life.
A burner unit is designed with a shell and cover structure. A first premixing chamber and a second premixing chamber are provided inside the shell, and a first and a second fire hole are provided on the cover. The secondary mixed gas in the second premixing chamber forms a counter-combustion with the root of the main flame to stabilize the main flame, and the light flame in the second premixing chamber reduces the height of the rich flame.
The burner flame stability is improved, the flame height is reduced, CO emissions and combustion noise are reduced, and the service life of the heat exchanger is extended.
Smart Images
Figure CN223425272U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hot water equipment, in particular to a burner unit, a burner and a gas water heater. Background Art
[0002] The burner is an important component of a gas water heater, and its main function is to provide a place for gas combustion. Currently, many burners use evenly distributed fire holes in the center to control the flame during combustion. This will result in a single flame shape during gas combustion. Moreover, when the gas and air flow rates change, the flame is prone to unstable flame combustion, such as jitter and flameout. At the same time, it will cause high CO content in the flue gas and loud combustion noise. To address the above situation, some burners will extend a certain distance of flame stabilizing plates on both sides of the fire hole to reduce the impact of air flow rate on the flame. However, this will directly affect the mixing of secondary air and gas, resulting in the burner flame height being too high. When the flame is too high, its tail flame is prone to jitter and contact with the heat exchanger fins of the heat exchanger, affecting the life of the heat exchanger. Utility Model Content
[0003] One of the technical problems solved by the present invention is to provide a burner unit that can effectively solve the problems of unstable flame combustion and high flame height.
[0004] The second technical problem solved by the present invention is to provide a burner that can effectively solve the problem of unstable combustion of a single flame of the burner and high flame height.
[0005] The third technical problem solved by the present invention is to provide a gas water heater, which can solve the problem that the burner flame is unstable and the flame height is too high, resulting in a short life of the heat exchanger.
[0006] The first technical problem mentioned above is solved by the following technical solution:
[0007] A burner unit comprises a shell and a cover plate, wherein a first premixing chamber is provided inside the shell, an opening communicating with the first premixing chamber is provided on the top of the shell, and an injection port communicating with the first premixing chamber is further provided on the shell; the cover plate cover is provided on the opening, and a plurality of first grooves concave in a direction away from the shell are provided at intervals on both side walls of the cover plate in the width direction; the side walls of the shell in the width direction at least corresponding to the portion of the side walls of the cover plate in the width direction are a flat plate structure, and the two side walls of the shell in the width direction cooperate with the first grooves to form a plurality of separate second premixing chambers, the second premixing chambers having an air inlet communicating with the outside, the volume of a single second premixing chamber being smaller than the volume of the first premixing chamber, and a connecting air port communicating with the second premixing chamber and the first premixing chamber is further provided on the two side walls of the shell in the width direction, and a first fire hole communicating with the first premixing chamber and a second fire hole communicating with the second premixing chamber are provided on the top of the cover plate.
[0008] Compared with the background technology, the burner monomer described in the utility model has the following beneficial effects:
[0009] The first groove on the cover plate cooperates with the shell to form a plurality of second premixing chambers spaced apart. The volume of the second premixing chamber is smaller than that of the first premixing chamber, that is, the secondary mixed gas passing through the second premixing chamber is smaller than the primary mixed gas in the first premixing chamber, and the oxygen content in the secondary mixed gas is obviously greater than the oxygen content in the primary mixed gas. Therefore, the height of the light flame formed by the second fire hole will be lower than the height of the rich flame formed by the first fire hole. The light flame can serve as a flame stabilizing function for the main flame, forming a counter-combustion with the root of the rich flame, making the main flame more stable, and effectively avoiding unstable conditions such as flameout and shaking of the main flame. At the same time, the carbon dioxide and water vapor generated by the light flame can diffuse into the rich flame, reducing the oxygen concentration and combustion temperature of the rich flame, thereby reducing the height of the main flame. At the same time, the setting of the second premixing chamber does not affect the volume of the first premixing chamber, will not cause a reduction in the combustion power of the burner unit, and will not increase the processing difficulty of the shell.
[0010] In one embodiment, the lower end of the first groove is open to form the air inlet, and / or the upper end of the first groove is connected to the top of the cover plate to form the second fire hole.
[0011] In one embodiment, the ventilation area of the air inlet is larger than the ventilation area of the second fire hole.
[0012] In one embodiment, the ventilation area of the first groove gradually decreases from the lower end upward.
[0013] In one embodiment, the width of the first groove gradually decreases from the bottom end to the top, and the depth of the first groove remains the same from the bottom end to the top.
[0014] In one embodiment, the first fire hole includes a first hole directly connected to the second fire hole and a second hole separated from the second fire hole. The first hole and the second fire hole are arranged in a one-to-one correspondence, and the second hole is arranged on opposite sides of any first hole along the length direction of the cover plate.
[0015] In one embodiment, the second hole includes a first sub-hole and a second sub-hole, the second sub-hole and the first hole are respectively located on opposite sides of the second sub-hole along the length direction of the cover plate, and the ventilation area of the first sub-hole is larger than the ventilation area of the second sub-hole.
[0016] In one embodiment, the communicating air port includes at least two air ports spaced apart from each other.
[0017] The second technical problem mentioned above is solved by the following technical solution:
[0018] A burner comprises a shell and any one of the above-mentioned burner units, wherein a plurality of the burner units are arranged in parallel in the shell.
[0019] Compared with the background technology, the burner of the present invention has the beneficial effects of improving the stability of the combustion flame of the burner and reducing the height of the combustion flame.
[0020] The third technical problem mentioned above is solved by the following technical solution:
[0021] A gas water heater comprises a heat exchanger and the burner, wherein the burner is arranged below the heat exchanger.
[0022] Compared with the background technology, the gas water heater described in the utility model has the following beneficial effects:
[0023] Gas water heaters can improve the stability of the combustion flame and increase the service life of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a schematic structural diagram of a burner unit provided in an embodiment of the present utility model;
[0025] Figure 2 This is a schematic diagram of the explosion structure of a burner unit provided in an embodiment of the present utility model;
[0026] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle;
[0027] Figure 4 for Figure 2 Schematic diagram of the enlarged structure at B in the middle;
[0028] Figure 5 for Figure 2 Schematic diagram of the enlarged structure at C in the middle;
[0029] Figure 6 A side view of a burner unit provided in an embodiment of the present utility model;
[0030] Figure 7 for Figure 6 Cross-sectional view along the D direction;
[0031] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at E in the middle.
[0032] Description of labels:
[0033] 1. Shell; 11. First side shell; 11a. Second groove; 12. Second side shell; 12a. Third groove; 13. Folding structure; 1a. First premixing chamber; 1b. Injection port; 1c. Communication port;
[0034] 2. Cover plate; 21. Top plate; 22. First side plate; 23. Second side plate; 2a. First groove; 2b. First fire hole; 2b1. First hole; 2b2. First sub-hole; 2b3. Second sub-hole; 2c. Second fire hole; 2d. Air inlet;
[0035] 3a. Second premixing chamber. DETAILED DESCRIPTION
[0036] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0037] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0038] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.
[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0040] refer to Figures 1-8 As shown, in the embodiment of the present invention, a burner monomer is proposed, comprising a shell 1 and a cover plate 2. A first premixing chamber 1a is provided inside the shell 1. The top of the shell 1 ( Figure 1 The Z direction is up, and the opposite direction of the Z direction is down) is provided with an opening connected to the first premixing chamber 1a, and the shell 1 is also provided with an injection port 1b connected to the first premixing chamber 1a. The cover plate 2 is covered on the opening, and the cover plate 2 is provided along the width direction ( Figure 1 A plurality of first grooves 2a are provided on both side walls (in the Y direction and the reverse direction) of the housing 1. The two side walls (in the Y direction and the reverse direction) of the housing 1 are provided with a plurality of first grooves 2a which are recessed in the direction away from the housing 1. Figure 1 The outer wall surface (in the Y direction and the opposite direction) cooperates with the first groove 2a to form a plurality of separate second premixing chambers 3a. The second premixing chambers 3a have an air inlet 2d connected to the outside. The volume of a single second premixing chamber 3a is significantly smaller than that of the first premixing chamber 1a. The two side walls of the shell 1 along the width direction are further provided with a connecting air port 1c connecting the second premixing chamber 3a and the first premixing chamber 1a. The top of the cover plate 2 is provided with a first fire hole 2b connected to the first premixing chamber 1a and a second fire hole 2c connected to the second premixing chamber 3a.
[0041] It can be understood that the gas and the primary air can enter the first premixing chamber 1a through the injection port 1b to mix and form a primary mixed gas. Part of the primary mixed gas can flow out from the first fire hole 2b and burn to form a thick flame. The other part can enter the second premixing chamber 3a through the connecting air port 1c and mix with the secondary air entering from the air inlet 2d under the action of negative pressure to form a secondary mixed gas. The secondary mixed gas can flow out from the second fire hole 2c and burn to form a light flame. Since the volume of the first premixing chamber 1a is larger than the volume of the single second premixing chamber 3a, that is, the amount of secondary mixed gas passing through the second premixing chamber 3a is less than the amount of primary mixed gas passing through the first premixing chamber 1a, and since The primary mixed gas entering the second premixing chamber 3a can be mixed with the secondary air again to form a secondary mixed gas. The oxygen content in the secondary mixed gas is obviously greater than the oxygen content in the primary mixed gas. Therefore, the height of the light flame formed through the second fire hole 2c will be lower than the height of the rich flame formed through the first fire hole 2b. The light flame can act as a flame stabilizing plate for the main flame, forming a counter-combustion with the root of the rich flame, making the main flame more stable, and effectively avoiding unstable conditions such as flameout and shaking of the main flame. At the same time, the carbon dioxide and water vapor generated by the light flame can diffuse into the rich flame, reducing the oxygen concentration and combustion temperature of the rich flame, reducing the height of the rich flame, and thereby reducing the possibility of contact between the rich flame and the heat exchanger.
[0042] It should be emphasized that the shell 1 only plays the role of blocking the notch of the first groove 2a in the formation of the second premixing chamber 3a, and does not play the role of increasing the volume of the second premixing chamber 3a, that is, the side wall of the shell 1 along the width direction at least corresponding to the side wall of the cover plate 2 along the width direction is a flat plate structure, then the setting of the second premixing chamber 3a does not occupy the volume of the first premixing chamber 1a, will not cause a decrease in the combustion power of the burner unit, and will not increase the processing difficulty of the shell 1.
[0043] Specifically, the upper end of the first groove 2a communicates with the top of the cover plate 2 to form a second flame hole 2c, and / or the lower end of the second groove 2a is open to form an air inlet 2d in conjunction with the housing 1. Compared to a closed upper and lower end arrangement, the upper end of the first groove 2a can serve as the second flame hole 2c and / or the lower end of the first groove 2a can serve as the air inlet 2d, eliminating the need for subsequent drilling to form the second flame hole 2c and air inlet 2d, thereby reducing the difficulty of manufacturing the burner unit.
[0044] In order to reduce the resistance of the secondary air entering the second premixing chamber 3a from the air inlet 2d and enable the light flame to burn stably, the ventilation area of the air inlet 2d is larger than the ventilation area of the second flame hole 2c.
[0045] Optionally, the ventilation area of the first groove 2a gradually decreases from the bottom end upward to guide the secondary air. The gradual decrease in ventilation area of the first groove 2a from the bottom end upward includes the following situations: the width of the first groove 2a gradually decreases from the bottom end upward; the depth of the first groove 2a gradually decreases from the bottom end upward; and both the width and depth of the first groove 2a decrease from the bottom end upward. It should be understood that the width of the first groove 2a refers to the width of the first groove 2a along the length of the cover plate 2, and the depth of the first groove 2a refers to the distance between the bottom of the first groove 2a and the sidewall of the housing 1.
[0046] In one embodiment, to ensure the structural strength of the cover plate 2, the first groove 2a is configured so that only the groove width gradually decreases from bottom to top, while the groove depth remains consistent from bottom to top. This can be further subdivided into two options: one in which the entire first groove 2 is configured in a trumpet shape, with the width gradually decreasing from the bottom to the top, and the other in which only the lower end of the first groove 2a is trumpet-shaped. To prevent the second flame hole 2c from being too small and affecting the formation of the pale flame, in one embodiment, only the lower end of the first groove 2a is trumpet-shaped.
[0047] refer to Figure 3 As shown, the first fire hole 2b includes a first hole 2b1 and a second hole, wherein the first hole 2b1 is provided in two groups, and the two groups of first holes 2b1 are symmetrically arranged on opposite sides of the top of the cover plate 2 along the width direction. Each group of first holes 2b1 includes a plurality of first holes 2b1 corresponding to the second fire holes 2c one by one, and the first holes 2b1 are connected to the corresponding second fire holes 2c. Any first hole 2b1 is arranged along the length direction of the cover plate 2 ( Figure 1 A second hole is provided on both sides (in the X-direction and its opposite direction), separated from the second flame hole 2c. Since the first hole 2b1 is connected to the second flame hole 2c, the light flame can contact the rich flame from its root, thus improving the stability of the rich flame. Furthermore, when the burner is used alone, air is drawn in from both sides of the first flame hole 2b. Separating the second hole from the second flame hole 2c prevents the second hole from affecting the air intake due to its connection with the second flame hole 2c.
[0048] Specifically, the second hole includes a first sub-hole 2b2 and a second sub-hole 2b3. The first sub-hole 2b2 is centered along the width of the cover plate 2 at the top of the cover plate 2. This means that one first sub-hole 2b2 corresponds to two first holes 2b1. The second sub-hole 2b3 and the first hole 2b1 are located on opposite sides of the first sub-hole 2b2 along the length of the cover plate 2. The ventilation area of the first sub-hole 2b2 is greater than that of the second sub-hole 2b3. The gas flow rate of the first sub-hole 2b2 is faster than that of the second sub-hole 2b3. Furthermore, the total area of the first flame hole 2b is increased, further improving the uniformity and stability of the combustion flame of the combustion monomer during use. Specifically, the first hole 2b1, the first sub-hole 2b2, and the second sub-hole 2b3 are all configured as strip holes extending along the width of the cover plate 2. The strip holes have the same width, and the length of the first sub-hole 2b2 is greater than that of the second sub-hole 2b3.
[0049] It is understood that the amount of primary mixed gas entering the second premixing chamber 3a through the communicating port 1c should be neither too much nor too little. Too much will result in insufficient oxygen in the secondary mixed gas, making the formed light flame unstable, while too little will not stabilize the rich flame.
[0050] Based on this, in one embodiment, the communicating air port 1c includes at least two air ports spaced apart vertically, one of which is a circular hole and the other is a strip-shaped hole extending to the top end surface of the housing 1 (i.e., the end surface provided with an opening). The provision of at least two air ports increases the inlet area for the primary mixed gas to enter the second premixing chamber 3a, but does not increase it excessively. Furthermore, the provision of at least two air ports allows the primary mixed gas to be split into two streams that enter the second premixing chamber 3a, allowing the primary mixed gas to be fully mixed with the secondary air. In other embodiments, the communicating air port 1c can also be provided as a single port, with the size and shape of the port being determined as required.
[0051] refer to Figure 2 and Figure 6 As shown, the shell 1 includes a first side shell 11 and a second side shell 12, and the communication port 1c is opened at the position of the first side shell 11 and the second side shell 12 corresponding to the first groove 2a, and the first side shell 11 and the second side shell 12 are connected by a method including but not limited to welding or riveting, and the first side shell 11 and the second side shell 12 are respectively stamped with a second groove 11a and a third groove 12a, and the notches of the second groove 11a and the third groove 12a are opposite to each other to jointly form a first premixing chamber 1a, and the first end of the second groove 11a and the first end of the third groove 12a extend to one end surface of the first side shell 11 and one end surface of the second side shell 12 respectively to form a third port and a fourth port, and the third port and the fourth port cooperate to form an injection port 1b.
[0052] Specifically, the first side shell 11 is provided with hem structures 13 at least at both ends and at the bottom in the longitudinal direction. The hem structures 13 are bent toward the interior of the first side shell 11. A mounting slot for the second side shell 12 is formed between the hem structures 13 and the inner sidewall of the first side shell 11. The second side shell 12 can be inserted downwardly into the mounting slot of the first side shell 11 from the top of the first side shell 11 and riveted together to form the shell 1 via the hem structures 13. The hem structures 13 can restrict the relative movement of the second side shell 12 along the longitudinal direction of the shell 1 and relative to the bottom of the shell 1, acting as a limiter and facilitating the rapid riveting of the first and second side shells 11, 12.
[0053] refer to Figure 2 and Figure 3 As shown, the cover plate 2 includes a top plate 21 and a plurality of side plates connected to the top plate 21. The plurality of side plates are arranged around the top plate 21 to form a groove-like structure with an open bottom, so that the cover plate 2 can be placed on the opening of the shell 1 to block the opening. The first fire hole 2b and the second fire hole 2c are both provided on the top plate 21. Specifically, the side plates include two first side plates 22 located on opposite sides of the top plate 21 in the width direction and two second side plates 23 located on opposite sides of the top plate 21 in the length direction. The first side plates 22 and the second side plates 23 are not connected to each other and are formed with an avoidance gap. The second side plate 23 can be inserted into the first premixing chamber 1a from the opening and abut against the inner wall of the shell 1, while the first side plate 22 is located outside the first premixing chamber 1a and abuts against the two side walls of the shell 1 in the width direction (i.e., the first side shell 11 and the second side shell 12). The first groove 2a is formed on the first side plate 22. The first side plate 22 and the second side plate 23 are respectively located inside and outside the first premixing chamber 1a, which can improve the stability of the connection between the cover plate 2 and the shell 1 and prevent the cover plate 2 from loosening or even separating from the shell 1 due to the flow of gas. At this time, the shell 1 also plays the role of supporting the cover plate 2.
[0054] The present invention also provides a burner in an embodiment, comprising a housing and a plurality of burner units according to any of the above embodiments. The plurality of burner units are arranged in parallel within the housing. A burner fabricated using the burner units of this embodiment can improve the stability and uniformity of the burner's combustion flame, while also reducing the height of the combustion flame. The structure of the burner units has been described in the above embodiment and will not be further elaborated here.
[0055] The present invention also provides a gas water heater, comprising a heat exchanger and a burner, with the burner disposed below the heat exchanger. The heat exchanger in the gas water heater body of this embodiment has a long service life. Other structures in the gas water heater may be various currently known or future-available structures, and will not be described in detail here.
[0056] In the specific contents of the foregoing specific embodiments, each technical feature can be combined arbitrarily without contradiction, and to make the description brief, all possible combinations of the foregoing technical features are not described, however, as long as the combinations of the technical features do not exist contradiction, it should be considered that it is within the scope of the description.
[0057] The specific contents of the foregoing specific embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.
Claims
1. A burner unit, characterized in that: include: A shell (1), wherein a first premixing chamber (1a) is provided inside the shell (1), an opening communicating with the first premixing chamber (1a) is provided at the top of the shell (1), and an injection port (1b) communicating with the first premixing chamber (1a) is also provided on the shell (1); A cover plate (2), the cover plate (2) being arranged to cover the opening, and a plurality of first grooves (2a) recessed in a direction away from the housing (1) are provided at intervals on two side walls of the cover plate (2) in the width direction; At least the portion of the side wall of the shell (1) along the width direction corresponding to the side wall of the cover plate (2) along the width direction is a flat plate structure; the two side walls of the shell (1) along the width direction cooperate with the first groove (2a) to form a plurality of separate second premixing chambers (3a); the second premixing chamber (3a) has an air inlet (2d) connected to the outside; the volume of a single second premixing chamber (3a) is smaller than the volume of the first premixing chamber (1a); the two side walls of the shell (1) along the width direction are further provided with a communicating air port (1c) connecting the second premixing chamber (3a) and the first premixing chamber (1a); the top of the cover plate (2) is provided with a first fire hole (2b) connected to the first premixing chamber (1a) and a second fire hole (2c) connected to the second premixing chamber (3a).
2. The burner unit according to claim 1, characterized in that: The lower end of the first groove (2a) is open to form the air inlet (2d), and / or the upper end of the first groove (2a) passes through the top of the cover plate (2) to form the second fire hole (2c).
3. The burner unit according to claim 2, characterized in that: The ventilation area of the air inlet (2d) is larger than the ventilation area of the second fire hole (2c).
4. The burner unit according to claim 2, characterized in that: The ventilation area of the first groove (2a) gradually decreases from the lower end upward.
5. The burner unit according to claim 2, characterized in that: The groove width of the first groove (2a) gradually decreases from the lower end upwards, and the groove depth of the first groove (2a) is the same from the lower end upwards.
6. The burner monomer according to any one of claims 1 to 5, characterized in that: The first fire hole (2b) comprises a first hole (2b1) directly connected to the second fire hole (2c) and a second hole separated from the second fire hole (2c); the first hole (2b1) and the second fire hole (2c) are arranged in a one-to-one correspondence; and any first hole (2b1) is provided with a second hole on opposite sides along the length direction of the cover plate (2).
7. The burner unit according to claim 6, characterized in that: The second hole comprises a first sub-hole (2b2) and a second sub-hole (2b3); the second sub-hole (2b3) and the first hole (2b1) are respectively located on opposite sides of the first sub-hole (2b2) along the length direction of the cover plate (2); and the ventilation area of the first sub-hole (2b2) is larger than the ventilation area of the second sub-hole (2b3).
8. The burner monomer according to any one of claims 1 to 5, characterized in that: The communicating air port (1c) comprises at least two air ports spaced apart from each other.
9. A burner comprising a housing, characterized in that It also includes a burner unit as described in any one of claims 1-8, wherein a plurality of the burner units are arranged in parallel in the shell.
10. A gas water heater comprising a heat exchanger, characterized in that: The apparatus further comprises the burner according to claim 9, wherein the burner is disposed below the heat exchanger.