A noise reduction structure and a burner applying the same

Abstract

The present application relates to a kind of noise reduction structure and the burner of application has the noise reduction structure, it is characterized in that: along the direction of airflow, the noise reduction structure includes the body of annular and the plate body for being arranged in the body to stratify injection gas, the plate body is provided with at least two, adjacent plate body is formed with flow channel, each flow channel has air inlet respectively, and the upstream of each flow channel air inlet is provided with the rectifier for the flow regulation of injection gas, compared with prior art, the advantages of the present application are that: the flow channel formed between each plate body of the noise reduction structure can flow regulation and stratify injection gas, thereby play the role of noise reduction, in addition, the present application also provides a kind of burner, the design of the lower concave mixing chamber in furnace body can form the cavity similar to "buffer chamber", can better mix the gas and primary air injected from injection pipe, help to meet the combustion efficiency of high load combustion of burner.

Description

TECHNICAL FIELD

[0001] The present application relates to a burner of a gas stove, in particular to a burner with a noise reduction structure. BACKGROUND

[0002] At present, there are mainly two kinds of gas burners used on kitchen utensils, one of which is an ejector type gas burner, which generally includes a fire cover, an ejector pipe and a spray head, the ejector pipe is provided with a first air inlet at one end corresponding to the spray head, the ejector pipe communicates with the outside atmosphere through the first air inlet, the gas is sprayed into the ejector pipe at high speed from the spray head, and a strong injection is formed in the ejector pipe, the outside air is sucked into the ejector pipe from the air inlet, and after mixing with the gas in the ejector pipe, it is sent to the fire cover for combustion. By observing the stove using this ejector type gas burner, a certain noise will be generated in the process of mixing gas injection air and gas in the ejector pipe, which is easy to make the user mistakenly think that there is a gas leakage phenomenon in some places of the stove, causing the user to have psychological panic. Therefore, the applicant provides a low-noise ejector pipe, such as Chinese patent No. ZL201820255595.9 (authorized publication No. CN208090670U) "Ejector pipe for burner", which is divided into a contraction part, a mixing part and a diffusion part according to the change of the cross section along the airflow direction. The diffusion part includes at least two expansion sections arranged at intervals and having cross-sectional areas gradually increasing in sequence along the airflow direction. The cross-sectional area at the inlet end of the upstream expansion section is smaller than that at the inlet end of the downstream expansion section. The adjacent expansion sections are connected by a connecting section. Since the gas flows into the mixing part at a certain speed, a part of the air flows into the expansion section with the gas. The flow speed is greater, the friction between the airflow and the inner wall of the cavity of the expansion section is greater, and the noise is greater. Although the ejector pipe uses the connecting section to divide the diffusion part into several expansion sections, the speed of the airflow decreases rapidly after passing through the expansion section, and then accelerates through the first connecting section. Most of the kinetic energy is converted into static pressure, and the noise is greatly reduced. However, the ejector pipe cannot be applied to the existing burner structure, and further improvement is needed. SUMMARY

[0003] The first technical problem to be solved by the present application is to provide a noise reduction structure that is not easy to produce noise in view of the above-mentioned prior art status.

[0004] The second technical problem to be solved by the present application is to provide a burner with the above-mentioned noise reduction structure in view of the above-mentioned prior art status.

[0005] The technical scheme adopted by the present application to solve the first technical problem is: the noise reduction structure is characterized in that: along the air flow direction, the noise reduction structure comprises a body in a ring shape and a plate body arranged in the body to layer the ejecting gas, the plate body is provided with at least two, a flow channel is formed between adjacent plate bodies, each flow channel has an air inlet, and a flow straightener for straightening the ejecting gas is arranged upstream of the air inlet of each flow channel.

[0006] The position of each plate body corresponding to the air inlet is recessed downward along the downstream to form a recessed inlet, and the flow straightener is arranged at the recessed inlet. Since the performance of the burner is super high energy efficiency and super large load, the ejecting kinetic energy of the ejecting pipe is strong, and there is a certain velocity impulse at the position of the recessed inlet. In order to minimize the flow loss of the ejecting core flow, a "U"-shaped recessed inlet is designed along the jet direction of the ejecting gas. The shape of the "U"-shaped recessed inlet should conform to the flow characteristics of the ejecting flow, and the boundary is an equal velocity line of v=2.4 m / s. According to the flow field measurement, the opening width of the "U"-shaped recessed inlet is about the same as the diameter d1 of the end of the diffuser section of the ejecting pipe, and the depth of the "U"-shaped recessed inlet is about 0.53d1.

[0007] In order to straighten the air flow of the ejecting gas, preferably, the flow straightener comprises a flow straightener ring and at least two flow straightener blades arranged at intervals along the circumferential direction of the flow straightener ring.

[0008] In order to alleviate the aerodynamic noise, preferably, at least two flow relief holes are formed in each plate body for flow relief. The flow relief holes alleviate the aerodynamic noise and also alleviate the oscillation noise caused by the excessive volume expansion of the gas when the gas is ignited. Each flow relief hole can also eliminate noise of different frequencies.

[0009] In order to make the air flow uniformly distributed along the circumferential direction of the fire cover, preferably, the cross section of each plate body is in an inverted "L" shape. Since each plate body is arranged in an inverted "L" shape, the air flow can be turned in a "┐" shape, which can guide the air flow to diffuse to the other side.

[0010] In order to facilitate the combined installation of the noise reduction structure, preferably, the body in a ring shape is provided with two, namely a first ring body located upstream and a second ring body located downstream, each plate body is connected between the first ring body and the second ring body, and the end of each flow straightener blade is connected to the first ring body.

[0011] To solve the second technical problem, the present application provides a burner applying the noise reduction structure as described above, comprising a burner body, characterized in that: the burner body has a concave air and gas mixing chamber, and a ring-shaped fire cover is arranged around the top of the circumferential wall of the mixing chamber, the mixing chamber is communicated with an ejecting pipe, and the noise reduction structure is arranged downstream of the gas outlet of the ejecting pipe in the mixing chamber.

[0012] In order to improve the fire intensity of the ring-shaped fire cover, preferably, the ring-shaped fire cover comprises a ring-shaped top wall and an inner ring wall extending vertically or obliquely downward from the inner side edge of the ring-shaped top wall, and a lower ring body is further arranged below the body, the lower ring body and the inner ring wall and the ring-shaped top wall jointly form a mixing chamber which is communicated with the gas mixing chamber, and the upper end surface of the lower ring body and the ring-shaped top wall of the body have a first annular gap.

[0013] In order to conveniently communicate the mixing chamber of the burner body and the ring-shaped fire cover, preferably, a connecting body which can cover the top of the peripheral side wall of the mixing chamber is arranged between the mixing chamber of the burner body and the ring-shaped fire cover, and a gas passage which communicates with the lower ring body is arranged on the connecting body, and correspondingly, an opening which communicates with the gas passage is arranged on the lower ring body. By arranging the connecting body, when the burner is installed as a whole, only the burner body, the connecting body, the lower ring body and the ring-shaped fire cover need to be arranged.

[0014] In order to improve the uniformity of the fire of the ring-shaped fire cover, preferably, at least two second annular gaps which are arranged at intervals in the radial direction are arranged on the ring-shaped top wall.

[0015] In order to realize the mutual connection between the second annular gaps, preferably, connecting blocks which are arranged at intervals in the circumferential direction are arranged between adjacent second annular gaps.

[0016] In order to avoid the defect that the connecting blocks corresponding to the second annular gaps cannot emit fire, preferably, a communication hole which communicates with the mixing chamber is arranged on the connecting block.

[0017] In order to improve the stability of the fire of the first annular gap and the second annular gap, preferably, an outer ring wall which extends vertically downward from the outer side edge of the ring-shaped top wall is arranged, the outer ring wall is located on the inner side of the lower ring body, and the outer ring wall is arranged at intervals in the circumferential direction and has at least two flame stabilizing holes which communicate with the mixing chamber.

[0018] Compared with the prior art, the advantages of the present application are that: the flow channels formed between the plates of the noise reduction structure can flow and stratify the ejecting gas, thereby playing a role in reducing noise, and each flow channel has an air inlet, which can better guide the ejecting gas to the fire cover, the plates can disperse the large vortex generated by the turning and rising, thereby reducing the turbulence intensity of the ejecting gas passing through the fire hole, and a flow straightener is arranged upstream of the air inlet of each flow channel to reduce noise. In addition, the present application also provides a burner, which can form a "buffer chamber"-like cavity through the design of the lower concave mixing chamber in the burner body, and can better mix the gas and primary air introduced from the ejecting pipe, thereby helping to meet the combustion efficiency of high-load combustion of the burner. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 This is a schematic diagram of the noise reduction structure in Embodiment 1 of the present invention;

[0020] Figure 2 for Figure 1 Another structural diagram from a different angle;

[0021] Figure 3 This is a partial cross-sectional view of the burner at one angle in Embodiment 1 of the present invention;

[0022] Figure 4 This is a partial cross-sectional view of the burner from another angle in Embodiment 1 of the present invention;

[0023] Figure 5 This is a schematic diagram of the lower ring body in Embodiment 1 of the present invention;

[0024] Figure 6 This is a schematic diagram of the connector structure in Embodiment 1 of the present invention;

[0025] Figure 7 This is a cross-sectional view of the annular flame cap in Embodiment 1 of the present invention;

[0026] Figure 8 This is a schematic diagram of the noise reduction structure in Embodiment 2 of the present invention. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] Example 1

[0029] like Figures 1 to 7 The diagram shows the preferred embodiment of the present invention. The noise reduction structure in this embodiment includes a ring-shaped body and plates 3 disposed within the body to stratify the ejector gas. At least two plates 3 are provided, and flow channels 4 are formed between adjacent plates 3. Each flow channel 4 has an air inlet 5. The flow channels 4 formed between the plates 3 can rectify and stratify the ejector gas, thereby reducing noise. This allows the ejector gas to be better guided to the flame cap. Each plate 3 can disperse the large vortex generated by the upward turning, reducing the turbulence intensity of the ejector gas passing through the flame hole, thus reducing noise. Simultaneously, each flow channel 4 has an air inlet 5, and a rectifier 50 is disposed upstream of the air inlet of each flow channel to rectify the ejector gas. The rectification of the ejector gas by the rectifier 50 further reduces noise. In this embodiment, the rectifier 50 includes a rectifier ring 501 and at least two rectifier blades 502 arranged circumferentially along the rectifier ring 501.

[0030] Specifically, in order to alleviate the aerodynamic noise, at least two flow slowing holes 31 are formed on each plate body 3 for slowing down the flow, which alleviates the aerodynamic noise and also alleviates the oscillation noise caused by the excessive volume expansion of the gas when the gas is on fire. Each flow slowing hole 31 can also eliminate noise of different frequencies. In order to make the gas flow uniformly distributed along the circumference of the fire cover, the cross section of each plate body 3 is in the shape of an inverted "L". Since each plate body 3 is arranged in the shape of an inverted "L", the gas flow can make a "┐" type turn, which can guide the gas flow to spread to the other side. In addition, in order to facilitate the combined installation of the noise reduction structure, two ring-shaped bodies are provided, which are a first ring-shaped body 1 located upstream and a second ring-shaped body 2 located downstream. Each plate body 3 is connected between the first ring-shaped body 1 and the second ring-shaped body 2. In the present embodiment, the porosity of the flow slowing hole 31 is 89.5%, which is composed of 6 layers of air and 5 layers of plate body 3. It can be selected to be composed of sound absorbing panels staggered combination. The straight corner turning type multilayer design improves the low frequency sound absorption performance. The thickness of each layer of air is about 3mm, and the thickness of each layer of sound absorbing panel is about 0.5mm.

[0031] In addition, each plate body 3 is recessed downward along the downstream to form a recessed inlet 30 corresponding to the position of the air inlet. The flow regulator 50 is arranged at the recessed inlet 30. Since the performance of the burner is super high energy efficiency and super large load, the injection pipe has strong injection kinetic energy. There is a certain velocity impulse at the position of the recessed inlet 30. In order to minimize the flow loss of the injection core flow, a "U" shaped recessed inlet 30 is designed along the jet direction of the injection gas. The shape of the "U" shaped recessed inlet 30 should conform to the flow characteristics of the injection flow. With the contour line of v=2.4m / s as the boundary, through flow field measurement, the opening width of the "U" shaped recessed inlet 30 is about the same as the diameter d1 of the end of the expansion section of the injection pipe. The depth of the "U" shaped recessed inlet 30 is about 0.53d1. The flow regulator 50 is arranged in the recessed inlet 30 and on the first ring-shaped body 1, which can jointly reduce the noise.

[0032] Meanwhile, the embodiment also provides a burner provided with the noise reduction structure, which comprises a burner body, the burner body is provided with a lower concave air and gas mixing cavity 6, and an annular fire cover 7 is arranged on the top of the peripheral side wall of the mixing cavity 6, the mixing cavity 6 is communicated with an injection pipe 80, and the noise reduction structure is arranged in the mixing cavity 6 downstream of the gas outlet of the injection pipe 80. Wherein, the burner is designed with the lower concave mixing cavity 6 in the burner body, so that a cavity similar to a buffer cavity is formed, the gas and primary air injected from the injection pipe 80 can be better mixed, and the combustion efficiency of the burner under high load combustion can be improved. In order to improve the fire intensity of the annular fire cover 7, the annular fire cover 7 comprises an annular top wall 71 and an inner ring wall 72 vertically or obliquely extending downward from the inner side edge of the annular top wall 71, and a lower ring body 8 is further arranged below the body, the lower ring body 8 and the inner ring wall 72, the annular top wall 71 jointly form a gas mixing chamber 73 communicated with the mixing cavity 6, and the first annular gap 74 is formed between the upper end surface of the lower ring body 8 and the annular top wall 71 of the body. In order to conveniently communicate the mixing cavity 6 of the burner body with the annular fire cover 7, the connecting body 20 capable of covering the top of the peripheral side wall of the mixing cavity 6 is arranged between the mixing cavity 6 of the burner body and the annular fire cover 7, the gas passage 21 communicated with the lower ring body 8 is formed in the connecting body 20, and correspondingly, the opening 81 communicated with the gas passage 21 is formed in the lower ring body 8. In order to improve the uniformity of the fire of the annular fire cover 7, at least two second annular gaps 75 are formed in the annular top wall 71 and are arranged in the radial direction, and the connecting block 9 is arranged in the circumferential direction between the adjacent second annular gaps 75, so that the second annular gaps 75 are connected with each other. In order to avoid the defect that the connecting block 9 corresponding to the second annular gap 75 cannot emit fire, the communication hole 91 communicated with the gas mixing chamber 73 is formed in the connecting block 9. Finally, in order to improve the stability of the fire of the first annular gap 74 and the second annular gap 75, the outer ring wall 10 vertically extends downward from the outer side edge of the annular top wall 71, the outer ring wall 10 is located in the inner side of the lower ring body 8, and the outer ring wall 10 is arranged in the circumferential direction and is communicated with the gas mixing chamber 73.

[0033] In summary, the burner is provided with the noise reduction structure in the mixing cavity 6, the injection gas injected from the injection pipe 80 can be straightened and layered, so as to play a role in reducing noise, meanwhile, each plate body 3 of the noise reduction structure is arranged in an inverted "L" shape, so that the airflow is turned in a "┐" shape, the airflow can be guided to diffuse to the other side, so that the airflow is uniformly distributed along the circumferential direction of the fire cover, and the straightener for straightening the injection gas is arranged upstream of the air inlet of each flow channel, so as to further reduce noise.

[0034] Embodiment 2

[0035] The structure is basically the same as that of embodiment 1, the only difference is that the noise reduction structure does not have the concave inlet 30 and the straightener 50, like Figure 8as shown.

Claims

1. A burner comprising a burner head body, characterised in that: The furnace head body has a lower concave air-gas mixing cavity (6), and is provided with an annular fire cover (7) around the top of the peripheral side wall of the mixing cavity (6), the mixing cavity (6) is communicated with an ejector pipe (80), and a noise reduction structure is arranged in the mixing cavity (6) downstream of the gas outlet of the ejector pipe (80), Along the airflow direction, the noise reduction structure comprises a ring-shaped body and a plate body (3) arranged in the body to stratify the injected gas, the plate body (3) is provided with at least two, and flow channels (4) are formed between adjacent plate bodies (3), each flow channel (4) has a gas inlet (5), and a flow straightener (50) for straightening the injected gas is arranged upstream of the gas inlet of each flow channel, and the position corresponding to the gas inlet of each plate body (3) is recessed downward along the downstream to form a recessed inlet (30), and the flow straightener (50) is arranged at the recessed inlet (30).

2. The burner of claim 1, wherein: The flow straightener (50) comprises a flow straightener ring (501) and at least two flow straightener blades (502) arranged along the circumference of the flow straightener ring (501).

3. The burner of claim 2, wherein: At least two flow slowing holes (31) are formed in each plate body (3) for flow slowing.

4. The burner of claim 3, wherein: The cross section of each plate body (3) is in the shape of an inverted "L".

5. Burner according to any one of claims 2 to 4, characterized in that: The ring-shaped body is provided with two, namely a first ring-shaped body (1) located upstream and a second ring-shaped body (2) located downstream, and each plate body (3) is connected between the first ring-shaped body (1) and the second ring-shaped body (2), and the end of each flow straightener blade is connected to the first ring-shaped body (1).

6. The burner of claim 5, wherein: The annular fire cover (7) comprises an annular top wall (71) and an inner ring wall (72) vertically or obliquely extending downward from the inner side edge of the annular top wall (71), and a lower ring body (8) is further arranged below the body, the inner ring wall (72), the annular top wall (71) and the lower ring body (8) together form a gas mixing chamber (73) communicated with the mixing cavity (6), and the upper end surface of the lower ring body (8) and the annular top wall (71) of the body have a first annular gap (74).

7. The burner of claim 6, wherein: A connecting body (20) capable of covering the top of the peripheral side wall of the mixing cavity (6) is arranged between the mixing cavity (6) and the annular fire cover of the furnace head body, a gas passage (21) communicated with the lower ring body (8) is formed in the connecting body (20), and correspondingly, an opening (81) communicated with the gas passage (21) is formed in the lower ring body (8).

8. The burner of claim 7, wherein: At least two second annular gaps (75) are formed in the annular top wall (71) and are arranged radially inward and outward.

9. The burner of claim 8, wherein: Connecting blocks (9) are arranged along the circumference between adjacent second annular gaps (75).

10. The burner of claim 9, wherein: A communication hole (91) communicated with the gas mixing chamber (73) is formed in the connecting block (9).

11. The burner of claim 6, wherein: An outer ring wall (10) vertically extends downward from the outer side edge of the annular top wall (71), the outer ring wall (10) is located inside the lower ring body (8), and at least two flame stabilizing holes (101) communicated with the gas mixing chamber (73) are arranged along the circumference of the outer ring wall (10).

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