Nozzle assembly and combustor thereof

Abstract

The utility model discloses a nozzle assembly and a burner thereof, the nozzle assembly comprises a nozzle body, the inner part of the nozzle body is provided with a gas channel and a spray hole which are communicated with each other; the end, close to the spray hole, of the nozzle body is sleeved with the annular sleeve, a spiral air channel and a negative pressure cavity with an air outlet are formed between the nozzle body and the annular sleeve, and the spiral air channel is formed in the side, away from the spray hole, of the negative pressure cavity; the negative pressure cavity is communicated with external air through the spiral air channel. According to the nozzle assembly, the injection quality and capacity can be improved, fuel gas and air can be mixed more evenly, meanwhile, the temperature rise of the nozzle body can be reduced, and the combustion stability can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cooking stoves, in particular to a nozzle assembly and a burner thereof. Background Art

[0002] As one of the core components of the combustion system in gas cooking stoves, the structure of the nozzle determines the size of the primary air coefficient and plays a key role in the performance of the gas stove. At present, most of the nozzles on the market have a group of air entrainment holes or no air entrainment holes. Structures like this have a relatively small primary air coefficient, and it is easy to have the situation of unstable combustion flames, resulting in incomplete combustion of gas and low thermal efficiency.

[0003] In addition, the existing nozzles lack a self-cooling structure. During the process of the gas jetting directly from the nozzle, the mixing effect with air is poor, the combustion deteriorates, and the stability becomes worse, directly leading to a smaller firepower of the cooking stove, reduced efficiency, and relatively high exhaust gas emissions, polluting the environment. Summary of the Invention

[0004] The utility model aims to solve at least one of the problems existing in the related art to a certain extent. For this purpose, the utility model provides a nozzle assembly, which can improve the entrainment quality and ability, make the gas and air mix more evenly, and at the same time can reduce the temperature rise of the nozzle body, which is beneficial to improving the combustion stability. The utility model also provides a burner.

[0005] According to the above-provided nozzle assembly, it is realized through the following technical solutions:

[0006] A nozzle assembly includes: a nozzle body, in which a gas passage and a spray hole are connected and communicated; and an annular sleeve, which is sleeved outside one end of the nozzle body close to the spray hole. A spiral air passage and a negative pressure chamber with an air outlet are formed between the nozzle body and the annular sleeve. The spiral air passage is arranged on the side of the negative pressure chamber away from the spray hole, and the negative pressure chamber is communicated with the external air through the spiral air passage.

[0007] In some embodiments, the diameter of the annular sleeve gradually decreases along the air flow direction, and it includes a large straight-wall sleeve, an inclined-wall tapered sleeve, and a small straight-wall sleeve that are sequentially connected. The large straight-wall sleeve is sleeved outside the nozzle body and has an interference fit with the nozzle body. A spiral air passage is formed between the large straight-wall sleeve and the outer surface of the nozzle body. The inclined-wall tapered sleeve is sleeved outside the nozzle body and together encloses to form the negative pressure chamber. The small straight-wall sleeve is sleeved outside one end of the nozzle body close to the spray hole and together encloses to form the air outlet.

[0008] In some embodiments, the spiral air passage includes at least one spiral air channel, and the number of spiral turns of the spiral air channel is not less than [a certain number]; or the spiral air passage includes a plurality of swirling air channels arranged at circumferential intervals, and the number of spiral turns of the swirling air channel is less than [a certain number].

[0009] In some embodiments, an outer spiral groove is recessed at a position on the outer surface of the nozzle body corresponding to the large-diameter straight wall sleeve of the annular sleeve. The free end of the outer spiral groove is in interference fit with the inner surface of the large-diameter straight wall sleeve of the annular sleeve, and the spiral air channel is formed by the inner surface of the large-diameter straight wall sleeve of the annular sleeve and the outer spiral groove jointly enclosing; or an inner spiral groove is recessed on the inner surface of the large-diameter straight wall sleeve of the annular sleeve, the free end of the inner spiral groove is in interference fit with the outer surface of the nozzle body, and the spiral air channel is formed by the outer surface of the nozzle body and the inner spiral groove jointly enclosing.

[0010] In some embodiments, air through holes are provided on the outer spiral groove or the inner spiral groove.

[0011] In some embodiments, the diameter of the negative pressure chamber gradually increases along the air outlet direction, and / or the air outlet is arranged behind the gas outlet of the spray hole in the air outlet direction.

[0012] In some embodiments, an annular flange portion extending outward is convexly provided in the middle of the outer surface of the nozzle body, and one end of the annular sleeve away from the spray hole abuts against the annular flange portion; an air inlet for air to pass through is provided at any position among the annular flange portion, the annular sleeve or between the annular sleeve and the annular flange portion, and the air inlet end of the spiral air passage is connected to external air through the air inlet.

[0013] In some embodiments, an annular boss extending outward is circumferentially provided at one end of the annular sleeve close to the annular flange portion, and the annular boss abuts against the annular flange portion.

[0014] In some embodiments, a plurality of circumferentially spaced positioning grooves are recessed in the annular flange portion, and positioning portions extending toward the annular flange portion are provided at positions of the annular boss corresponding to the positioning grooves, and the positioning portions are inserted into the corresponding positioning grooves.

[0015] In some embodiments, the air inlet is formed between the bottom surface of the positioning groove and the positioning portion.

[0016] In some embodiments, an annular groove is recessed in the middle of the outer surface of the nozzle body, the annular flange portion is located between the annular groove and the annular sleeve, and the air inlet communicating with the annular groove is provided on the annular flange portion.

[0017] According to a burner provided above, it is achieved through the following technical solutions:

[0018] A burner includes an ejector tube and a nozzle assembly as described above. The nozzle assembly is installed on the ejector tube, and the air inlet end of the ejector tube is respectively communicated with the spray hole and the negative pressure chamber.

[0019] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0020] For the nozzle assembly of the present utility model, by sleeving an annular sleeve on the outer side of one end of the nozzle body close to the spray hole, a spiral air duct and a negative pressure chamber with an air outlet are formed between the annular sleeve and the nozzle body. The negative pressure chamber is communicated with external air through the spiral air duct. In this way, when air flows into the negative pressure chamber, a "swirl" is formed. This air swirl with a certain amount of energy mixes with the gas flow ejected from the spray hole, having a "tornado" effect, making the mixed air flow more uniform. At the same time, the air swirl continuously flushes the nozzle body, enabling the nozzle assembly to cool itself, so that the gas continuously and stably ejects along the spray hole, providing favorable conditions for the full combustion of the burner, effectively reducing the emission of CO pollutants in the flue gas, improving the combustion efficiency, and reducing gas waste. Description of the Drawings

[0021] Figure 1 is an exploded view of the nozzle assembly in Embodiment 1 of the present utility model;

[0022] Figure 2 is a structural schematic diagram of the nozzle assembly in Embodiment 1 of the present utility model;

[0023] Figure 3 is a cross-sectional view of the nozzle assembly in Embodiment 1 of the present utility model;

[0024] Figure 4 is a cross-sectional view of the burner in Embodiment 1 of the present utility model;

[0025] Figure 5 is an exploded view of the nozzle assembly in Embodiment 2 of the present utility model;

[0026] Figure 6 is an exploded view of the nozzle assembly in Embodiment 3 of the present utility model;

[0027] Figure 7 is an exploded view of the nozzle assembly in Embodiment 4 of the present utility model.

[0028] In the figure: 1 - nozzle body, 11 - gas passage, 12 - spray hole, 13 - external spiral groove, 131 - air through hole, 14 - annular flange portion, 15 - positioning groove, 16 - annular groove, 17 - threaded portion; 2 - annular sleeve, 21 - internal spiral groove, 22 - annular boss, 23 - positioning portion; 30 - air inlet, 311 - spiral air passage, 312 - swirling air passage, 32 - negative pressure chamber, 321 - air outlet; 4 - ejector tube; 5 - gas guide tube. Specific embodiments

[0029] The following embodiments are used to illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific embodiments of the present invention or making equivalent substitutions for some technical features without departing from the spirit of the present invention's solution shall be covered within the scope of the technical solution claimed by the present invention.

[0030] Embodiment 1

[0031] Reference Figures 1-3 In this embodiment, a nozzle assembly is provided, including a nozzle body 1 and an annular sleeve 2. Among them, a gas passage 11 and a spray hole 12 that are connected and communicated are provided inside the nozzle body 1. In this embodiment, the gas passage 11 includes an air inlet hole and a contraction hole, and the spray hole 12 is connected and communicated with the air inlet hole through the contraction hole. The annular sleeve 2 is sleeved outside one end of the nozzle body 1 close to the spray hole 12 and is connected and matched with the nozzle body. In this embodiment, the annular sleeve 2 is connected with the nozzle body 1 by interference fit. In other embodiments, the annular sleeve 2 and the nozzle body 1 can be detachably connected by threaded connection, fasteners or snap structures. A spiral air passage and a negative pressure chamber 32 with an air outlet 321 are formed between the nozzle body 1 and the annular sleeve 2. The spiral air passage is arranged on the side of the negative pressure chamber 32 away from the spray hole 12, and the negative pressure chamber 32 is connected and communicated with external air through the spiral air passage.

[0032] When gas with a certain pressure and velocity enters the gas passage 11 of the nozzle body 1, through the compression and conversion action of the contraction hole of the gas passage 11, a part of the dynamic pressure of the gas is converted into static pressure, so that the gas pressure energy increases. Flowing through the spray hole 12, it can be ejected at a high speed along the flow direction. The high-speed ejected gas drives the static air outside the spray hole 12 to flow forward, generating a pressure difference, so that the area near the outside of the spray hole 12 becomes a negative pressure area. This negative pressure area is the negative pressure chamber 32 with an air outlet 321. Since the negative pressure chamber 32 is connected and communicated with external air through the spiral air passage, under the action of negative pressure, external air flows into the negative pressure chamber 32 along the spiral air passage, and after flowing out through the air outlet 321 of the negative pressure chamber 32, it is mixed with the gas flowing out of the spray hole 12 to form an air-fuel mixture.

[0033] In contrast to existing nozzles, air enters in the direction of gas flow, i.e., in the same direction as the gas flow. Since there is no intersection angle in the same direction, the loss caused by the counterflow collision of the air flow due to the intersection angle is reduced, and the power of the air flow is stronger. Due to the arrangement of the spiral air passage, under the action of inertia, air flows along the spiral air passage at an accelerated speed, and the air flow accumulates more energy, forming an air vortex at the air outlet of the negative pressure chamber 32. The air vortex flows, diffuses and mixes with the gas flow to form a tornado effect. During this process, the strong air vortex mixes with the gas more evenly and thoroughly, and more air is inhaled, effectively improving the air entrainment ability of the nozzle assembly and the mixing effect of gas and air. In addition, during the flow of air along the spiral air passage, the end of the nozzle body 1 near the spray hole is continuously washed, cooling the nozzle body 1, enabling the mixed air flow flowing out of the nozzle assembly to flow constantly along the axis of the injection pipe, reducing the disturbance caused by the temperature rise, maintaining a stable mixing process, thereby improving the combustion condition of the burner, reducing the carbon monoxide content generated by combustion, increasing the thermal efficiency of the gas stove, and effectively saving energy and reducing emissions.

[0034] Reference Figure 1 , Further, the annular sleeve 2 is a thin cylindrical shell structure made of stainless steel with a relatively low thermal conductivity. In this way, the annular sleeve 2 blocks the heat transfer at the injection pipe end of the burner, protecting the nozzle body 1 from the influence of the external temperature. In this embodiment, the diameter of the annular sleeve 2 gradually decreases in the air flow direction. The annular sleeve 2 includes a large straight wall sleeve 201, an inclined wall cone sleeve 202 and a small straight wall sleeve 203 connected in sequence. The large straight wall sleeve 201 is sleeved outside the nozzle body 1 and has an interference fit with the nozzle body 1, and a spiral air passage is formed between the outer surface of the large straight wall sleeve 201 and the nozzle body 1. The inclined wall cone sleeve 202 is sleeved outside the nozzle body 1 and jointly encloses to form a negative pressure chamber 32. The small straight wall sleeve 203 is sleeved outside the end of the nozzle body 1 near the spray hole and jointly encloses to form an air outlet 321.

[0035] Further, the spiral air passage includes at least one spiral air channel 311, and the number of spiral turns of the spiral air channel 311 is not less than 1 turn. In this embodiment, the number of spiral air channels 311 is three. The three spiral air channels 311 are arranged at intervals. The number of spiral turns of each spiral air channel 311 is 1 turn, and the relative ends of each spiral air channel 311 are respectively communicated with the negative pressure chamber 32 and the external air. In this way, swirling air is provided for the nozzle assembly from three different angles, which is beneficial to improving the tornado effect and the cooling effect on the nozzle body 1, and effectively ensuring more uniform mixing of air and gas.

[0036] Specifically, an external spiral groove 13 is recessed in the outer surface of the nozzle body 1 at a position corresponding to the large straight wall sleeve 201 of the annular sleeve 2. The free end of the external spiral groove 13 is in interference fit with the inner surface of the large straight wall sleeve 201 of the annular sleeve 2, so that the annular sleeve 2 is fastened to the nozzle body 1. The spiral air passage 311 is formed jointly by the inner surface of the large straight wall sleeve 201 of the annular sleeve 2 and the external spiral groove 13.

[0037] Further, a diversion portion is formed at one end of the outer surface of the nozzle body 1 close to the spray hole 12. The diversion portion is arranged to be inclined or bent from the outside to the inside and towards the spray hole 12. The inclination of the diversion portion is greater than that of the inclined wall cone sleeve 202 of the annular sleeve 2. Due to the taper difference, a negative pressure chamber 32 is formed between the diversion portion and the inclined wall cone sleeve 202 of the annular sleeve 2, so that the caliber of the negative pressure chamber 32 gradually increases along the air outlet direction. In this embodiment, the small straight wall sleeve 203 is arranged between the gas outlet of the spray hole 12 and the inclined wall cone sleeve 202, so that the air outlet 321 is arranged behind the gas outlet of the spray hole 12 in the air outlet direction, leaving a gap S between the air outlet 321 and the gas outlet of the spray hole 12.

[0038] Reference Figures 1-3 Referring to, further, an annular flange portion 14 extending outward is convexly provided in the middle of the outer surface of the nozzle body 1. One end of the annular sleeve 2 away from the spray hole 12 abuts against the annular flange portion 14. Still further, an annular boss 22 extending outward is circumferentially provided at one end of the annular sleeve 2 close to the annular flange portion 14, and the annular boss 22 abuts against the annular flange portion 14.

[0039] In this embodiment, an air inlet 30 for air to pass through is provided on the annular flange portion 14. The intake end of the spiral air passage is connected to the external air through the air inlet 30. In other embodiments, the air inlet 30 can be changed to be provided on the annular sleeve 2, or the air inlet 30 can be changed to be provided between the annular sleeve 2 and the annular flange portion 14.

[0040] Reference Figures 1-3 Referring to, further, a plurality of circumferentially spaced positioning grooves 141 are recessed in the annular flange portion 14. At a position corresponding to the positioning grooves 141 of the annular sleeve 2, a positioning portion 23 extending towards the annular flange portion 14 is provided. The positioning portion 23 is inserted into the corresponding positioning groove 141, so as to realize the limit fixation of the annular sleeve 2 and effectively prevent the annular sleeve 2 from rotating relative to the nozzle body 1. In this embodiment, an air inlet 30 is formed between the groove bottom surface of the positioning groove 141 and the positioning portion 23.

[0041] Reference Figures 1-3, Further, a circular groove 15 is recessed in the middle of the outer surface of the nozzle body 1. The annular flange portion 14 is located between the circular groove 15 and the annular sleeve 2, and the air inlet 30 on the annular flange portion 14 is communicated with the circular groove 15. In addition, a threaded portion is provided at one end of the outer surface of the nozzle body 1 away from the nozzle.

[0042] This embodiment also provides a burner, which includes an ejector tube 4, a gas guide tube 5, and a nozzle assembly as described above. The nozzle assembly is installed on the ejector tube 4. The gas passage of the nozzle body 1 is communicated with the gas with a certain pressure and speed through the gas guide tube 5. The air inlet end of the ejector tube 4 is respectively communicated with the spray hole 12 and the negative pressure chamber 32. Thus, through the above nozzle assembly, air forms a "swirl" after flowing into the nozzle assembly. This air swirl with a certain energy mixes with the gas flow ejected from the spray hole 12 to have a "tornado" effect, making the mixed air flow more uniform. At the same time, due to the continuous scouring effect of the air swirl, the nozzle assembly cools itself, enabling the gas to continuously and stably eject along the spray hole, providing favorable conditions for the full combustion of the burner, effectively reducing the emission of CO pollutants in the flue gas, improving the combustion efficiency, and reducing gas waste. This nozzle assembly is simple to process and manufacture, convenient and practical, and has strong applicability, and can be applied to various gas cookers.

[0043] Embodiment 2

[0044] Reference Figure 5 , The difference between this embodiment and Embodiment 1 is that the spiral air passage includes a plurality of swirling air passages 312 arranged at circumferential intervals, and the number of spiral turns of the swirling air passage 312 is less than 1 turn. In this embodiment, the number of swirling air passages 312 is three, and the three swirling air passages 312 are arranged at intervals. Each swirling air passage 312 is spirally arranged along the circumferential direction of the nozzle body 1, and the number of spiral turns of each spiral air passage 311 is 1 / 3 turn. The opposite ends of each swirling air passage 312 are respectively communicated with the negative pressure chamber 32 and the external air.

[0045] It can be seen that swirling air is provided for the nozzle assembly from three different angles, improving the tornado effect and the cooling effect on the nozzle body 1. In addition, since the number of spiral turns of the spiral air passage 311 in this embodiment is less than that of the spiral air passage 311 in Embodiment 1, the structure of the nozzle assembly in this embodiment is simpler and easier to process and form.

[0046] Embodiment 3

[0047] Reference Figure 6, the difference between this embodiment and Embodiment 1 lies in the specific formation method of the spiral air passage 311. Specifically, an inner spiral groove 21 is recessed on the inner surface of the large straight-wall sleeve 201 of the annular sleeve 2, and the free end of the inner spiral groove 21 is in interference fit with the outer surface of the nozzle body 1 so that the annular sleeve 2 is fastened to the nozzle body 1. The spiral air passage 311 is formed jointly by the outer surface of the nozzle body 1 and the inner spiral groove 21.

[0048] Embodiment 4

[0049] Reference Figure 7 , the difference between this embodiment and Embodiment 1 is that an air through-hole 131 is provided on the outer spiral groove 13, so that adjacent spiral turns of the same spiral air passage 311 can be connected through the air through-hole 131, or adjacent spiral air passages 311 can be connected through the air through-hole 131.

[0050] When the spiral air passage 311 is formed jointly by the outer surface of the nozzle body 1 and the inner spiral groove 21, an air through-hole 131 can be provided on the inner spiral groove 21 so that adjacent spiral turns of the same spiral air passage 311 can be connected through the air through-hole 131, or adjacent spiral air passages 311 can be connected through the air through-hole 131.

[0051] The above are only some embodiments of the present utility model. For those of ordinary skill in the art, without departing from the inventive concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A nozzle assembly, characterized in that: include: A nozzle body (1), wherein a gas passage (11) and a spray hole (12) are provided in communication with each other; as well as An annular sleeve (2) is sleeved on the outside of one end of the nozzle body (1) close to the spray hole (12), and a spiral air passage and a negative pressure chamber (32) having an air outlet (321) are formed between the nozzle body (1) and the annular sleeve (2). The spiral air passage is arranged on a side of the negative pressure chamber (32) away from the spray hole (12), and the negative pressure chamber (32) is connected to the external air through the spiral air passage.

2. A nozzle assembly according to claim 1, characterized in that: The diameter of the annular sleeve (2) gradually decreases along the airflow direction, and it comprises a large straight-wall sleeve (201), an oblique-wall cone sleeve (202) and a small straight-wall sleeve (203) which are connected in sequence, the large straight-wall sleeve (201) being sleeved outside the nozzle body (1) and being interference-fitted with the nozzle body (1), a spiral air passage being formed between the large straight-wall sleeve (201) and the outer surface of the nozzle body (1), the oblique-wall cone sleeve (202) being sleeved outside the nozzle body (1) and jointly enclosing to form the negative pressure chamber (32), and the small straight-wall sleeve (203) being sleeved outside one end of the nozzle body (1) close to the spray hole (12) and jointly enclosing to form the air outlet (321).

3. A nozzle assembly according to claim 1 or 2, characterized in that: The spiral air channel comprises at least one spiral air channel (311), and the number of spiral turns of the spiral air channel (311) is not less than 1 turn; or The spiral air channel comprises a plurality of swirl air channels (312) arranged at intervals in the circumferential direction, and the number of spiral turns of the swirl air channel (312) is less than 1 turn.

4. A nozzle assembly according to claim 3, characterized in that: An outer spiral groove (13) is recessedly provided on the outer surface of the nozzle body (1) at a position corresponding to the large straight-walled sleeve (201) of the annular sleeve (2), the free end of the outer spiral groove (13) is interference-fitted with the inner surface of the large straight-walled sleeve (201) of the annular sleeve (2), and the spiral air passage (311) is formed by the inner surface of the large straight-walled sleeve (201) of the annular sleeve (2) and the outer spiral groove (13); or An inner spiral groove (21) is recessed on the inner surface of the large straight-walled sleeve (201) of the annular sleeve (2), the free end of the inner spiral groove (21) is interference-fitted with the outer surface of the nozzle body (1), and the spiral air channel (311) is formed by the outer surface of the nozzle body (1) and the inner spiral groove (21).

5. A nozzle assembly according to claim 4, characterized in that: An air through hole (131) is provided on the outer spiral groove (13) or the inner spiral groove (21).

6. A nozzle assembly according to claim 1 or 2, characterized in that: The diameter of the negative pressure chamber (32) gradually increases along the gas outlet direction, and / or the air outlet (321) is arranged behind the gas outlet of the spray hole (12) in the gas outlet direction.

7. A nozzle assembly according to claim 1 or 2, characterized in that: An annular flange portion (14) extending outward is convexly provided in the middle of the outer surface of the nozzle body (1), and one end of the annular sleeve (2) away from the spray hole (12) is in contact with the annular flange portion (14); An air inlet (30) for air to pass through is provided at any position of the annular flange portion (14), the annular sleeve (2), or between the annular sleeve (2) and the annular flange portion (14), and an air inlet end of the spiral air passage is connected to the external air through the air inlet (30).

8. A nozzle assembly according to claim 7, characterized in that: An outwardly extending annular boss (22) is circumferentially provided at one end of the annular sleeve (2) close to the annular flange portion (14), and the annular boss (22) is in contact with the annular flange portion (14).

9. A nozzle assembly according to claim 8, characterized in that: The annular flange portion (14) is recessed with a plurality of circumferentially spaced positioning grooves (141); the annular boss (22) is provided with a positioning portion (23) extending toward the annular flange portion (14) at a position corresponding to the positioning groove (141); the positioning portion (23) is inserted into the corresponding positioning groove (141).

10. A nozzle assembly according to claim 9, characterized in that: The air inlet (30) is formed between the bottom surface of the positioning groove (141) and the positioning portion (23).

11. A nozzle assembly according to claim 7, characterized in that: An annular groove (15) is recessed in the middle of the outer surface of the nozzle body (1), the annular flange portion (14) is located between the annular groove (15) and the annular sleeve (2), and the annular flange portion (14) is provided with the air inlet (30) which is connected to the annular groove (15).

12. A burner, characterized in that: It comprises an ejector tube (4) and a nozzle assembly as described in any one of claims 1 to 11, wherein the nozzle assembly is mounted on the ejector tube (4), and the air inlet end of the ejector tube (4) is respectively connected to the spray hole (12) and the negative pressure chamber (32).

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