Fire grate, burner and gas water heater

Abstract

The utility model relates to the technical field of fire grates, in particular to a fire grate, a burner and a gas water heater. The fire row comprises an injection part, a bending part, a rectification part and a head part which are sequentially communicated from bottom to top in the height direction, an air inlet is formed in the injection part, and a fire hole is formed in the top end of the head part. The rectification part comprises a first part and a second part which are arranged side by side in the length direction of the fire grate and communicate with each other, and the first part is located over the bent position of the bent part. In the width direction of the fire grate, the width of the cross section of the airflow channel of the first part is smaller than that of the cross section of the airflow channel of the second part. The burner and the gas water heater comprise the fire grate, and the width of the cross section of the gas flow channel of the first part is smaller than that of the cross section of the gas flow channel of the second part in the width direction of the fire grate, so that mixed gas is evenly distributed at the fire holes, sufficient and stable burning of gas at the fire holes is achieved, distortion and deviation of flames are avoided, and the service life of the burner and the gas water heater is prolonged. The problems that smoke exceeds the standard and combustion noise is high are effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fire grate technical field especially relates to a fire grate, combustor and gas water heater. BACKGROUND

[0002] The combustor is the core component of the gas water heater, the combustor is composed of multiple fire grates side by side, the high-speed gas jetted by the gas distribution rod sucks the ambient air into the airflow channel in the fire grate, the gas mixes with the air in the airflow channel and is ignited at the fire hole of the head of the fire grate to produce high-temperature flue gas and heat the cold water.

[0003] In the existing combustor, the size of the airflow channel inside the fire grate with the bent structure of the injection part is small, the pressure and speed distribution of the mixed gas at the fire hole of the head of the fire grate is uneven, which causes the flame to twist and deviate, so the gas and air are not mixed sufficiently, which causes the flue gas to exceed the standard and the combustion noise to be high due to the incomplete combustion of the gas. SUMMARY

[0004] One of the technical problems solved by the utility model is to provide a fire grate that can effectively solve the technical problem of uneven distribution of mixed gas of gas and air at the fire hole in the prior art, which causes the flue gas to exceed the standard and the combustion noise to be high due to the incomplete combustion of the gas.

[0005] The second technical problem solved by the utility model is to provide a combustor that can effectively solve the technical problem of uneven distribution of mixed gas of gas and air at the fire hole in the existing fire grate, which causes the flue gas to exceed the standard and the combustion noise to be high due to the incomplete combustion of the gas.

[0006] The third technical problem solved by the utility model is to provide a gas water heater that can effectively solve the technical problem of uneven distribution of mixed gas of gas and air at the fire hole in the existing combustor, which causes the flue gas to exceed the standard and the combustion noise to be high due to the incomplete combustion of the gas.

[0007] The first technical problem is solved by the following technical scheme:

[0008] The fire grate comprises an injection part, a bent part, a rectifier part and a head part that are sequentially communicated in the height direction from bottom to top, the injection part is provided with an air inlet, and the top end of the head part is provided with a fire hole;

[0009] Along the length direction of the fire grate, the rectifier part comprises a first part and a second part that are arranged side by side and connected, the first part is located directly above the bending part of the bent part; along the width direction of the fire grate, the width of the cross section of the airflow channel of the first part is smaller than the width of the cross section of the airflow channel of the second part.

[0010] The fire row has the beneficial effects that, compared with the background art, the fire row has the beneficial effects that,

[0011] The rectifying portion of the fire row comprises a first portion and a second portion which are arranged side by side and communicated along the length direction of the fire row, and the first portion is located directly above the bending portion of the bending portion. Along the width direction of the fire row, the width of the cross section of the airflow channel of the first portion is smaller than the width of the cross section of the airflow channel of the second portion, so that most of the mixed gas is prevented from flowing directly to the first portion along the height direction of the fire row after passing through the bending portion of the bending portion and flowing to the fire hole directly above the first portion through the first portion, so as to reduce the flow of the mixed gas flowing to the first portion and simultaneously increase the flow of the mixed gas flowing to the second portion, prolong the mixing time of most of the gas and air, make the gas and air mix more fully, and simultaneously make the mixed gas of the gas and air flow uniformly to the fire hole of the head portion, so as to ensure that the injection speed of the mixed gas at the fire hole is more uniform, realize that the mixed gas is fully and stably combusted at the fire hole, avoid that the flame is distorted and deviated, and effectively reduce the problems that the flue gas is over-standard and the combustion noise is high.

[0012] In one of the embodiments, the rectifying portion further comprises a third portion, the third portion has a first end and a second end along the length direction of the fire row, the first end is integrally connected with the first portion, and the second end is integrally connected with the second portion.

[0013] In one of the embodiments, along the length direction of the fire row, the width of the cross section of the airflow channel of the third portion gradually increases from the first end to the second end.

[0014] In one of the embodiments, along the length direction of the fire row, the length of the rectifying portion is L, the length of the first portion is L1, the length of the second portion is L2, and 0.2≤L1 / L≤0.4 and 0.35≤L2 / L≤0.53.

[0015] In one of the embodiments, a recessed platform recessed inward is arranged above the bending portion of the bending portion, and the recessed platform is located directly below the first portion.

[0016] In one of the embodiments, along the width direction of the fire row, the widths of the airflow channels corresponding to the bending portion, the recessed platform and the first portion respectively decrease.

[0017] In one of the embodiments, along the width direction of the fire row, two side walls of the second portion along the width direction of the fire row are respectively outwardly protruded to form convexities, and the convexity on one side wall of the second portion along the width direction of the fire row and the convexity on the other side wall of the second portion along the width direction of the fire row are one-to-one opposite and enclose a vertical channel.

[0018] In one of the embodiments, two sides of the airflow passage of the rectifying portion extend along the height direction of the fire grate.

[0019] The second technical problem is solved by the following technical solution:

[0020] The burner comprises the fire grate.

[0021] Compared with the background art, the burner has the beneficial effects that:

[0022] Along the width direction of the fire grate, the width of the cross section of the airflow passage of the first portion is smaller than the width of the cross section of the airflow passage of the second portion, so that most of the mixed gas after passing through the bending portion of the bending portion directly flows along the height direction of the fire grate to the first portion and then to the fire hole directly above the first portion, thereby reducing the flow of the mixed gas to the first portion and increasing the flow of the mixed gas to the second portion, prolonging the mixing time of most of the gas and air, making the gas and air mix more fully, and the mixed gas of the gas and air uniformly flows to the fire hole of the head portion, so that the injection speed of the mixed gas at the fire hole is more uniform, the mixed gas is fully and stably burned at the fire hole, the flame is prevented from being distorted and deviated, and the problems of excessive flue gas and high combustion noise are effectively reduced.

[0023] The third technical problem is solved by the following technical solution:

[0024] The gas water heater comprises the burner.

[0025] Compared with the background art, the gas water heater has the beneficial effects that:

[0026] Along the width direction of the fire grate, the width of the cross section of the airflow passage of the first portion is smaller than the width of the cross section of the airflow passage of the second portion, so that most of the mixed gas after passing through the bending portion of the bending portion directly flows along the height direction of the fire grate to the first portion and then to the fire hole directly above the first portion, thereby reducing the flow of the mixed gas to the first portion and increasing the flow of the mixed gas to the second portion, prolonging the mixing time of most of the gas and air, making the gas and air mix more fully, and the mixed gas of the gas and air uniformly flows to the fire hole of the head portion, so that the injection speed of the mixed gas at the fire hole is more uniform, the mixed gas is fully and stably burned at the fire hole, the flame is prevented from being distorted and deviated, and the problems of excessive flue gas and high combustion noise are effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic view of the fire grate provided by the utility model embodiment;

[0028] Figure 2 is a front view of the fire grate provided by the embodiment of the present application;

[0029] Figure 3 is Figure 2 is a sectional view of the fire grate in A-A direction;

[0030] Figure 4 is Figure 2 is a sectional view of the fire grate in B-B direction;

[0031] Figure 5 is Figure 2 is a sectional view of the fire grate in C-C direction.

[0032] The component names and labels in the figure are as follows:

[0033] 1, injection part; 11, air inlet; 2, bending part; 21, concave table; 211, flow guide edge; 3, straightening part; 30, side edge; 31, first part; 32, second part; 321, convex; 33, third part; 4, head part; 41, fire hole; 5, cover plate. DETAILED DESCRIPTION

[0034] In order to make the technical problems solved by the present application, the technical scheme adopted and the technical effects achieved more clear, the technical scheme of the present application will be further described below in conjunction with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, not all.

[0035] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature "on", "above" and "upper surface of" second feature includes that first feature is directly above and obliquely above second feature, or only indicates that horizontal height of first feature is higher than second feature. First feature "under", "below" and "under surface of" second feature includes that first feature is directly below and obliquely below second feature, or only indicates that horizontal height of first feature is less than second feature.

[0037] In the description of the embodiment, the orientation or position relationship of the terms "upper", "lower", "right", "left" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only used to distinguish in the description, and have no special meaning.

[0038] The technical scheme of the utility model is further illustrated below by specific embodiments in combination with the drawings.

[0039] The embodiment provides a burner, which is mainly used in a gas water heater. The burner generates high-temperature flue gas by burning gas to heat cold water in a heat exchanger, so as to supply hot water to a water end.

[0040] Specifically, the burner comprises a plurality of fire bars arranged side by side, as shown in Figure 1 and Figure 2 The fire bar comprises an injection part 1, a bending part 2, a flow regulation part 3 and a head part 4 sequentially communicated from bottom to top along the height direction (the up-down direction in the drawing) of the fire bar, the injection part 1 is provided with an air inlet 11, and the top end of the head part 4 is provided with a fire hole 41. The high-speed gas sprayed by the gas distribution rod sucks surrounding air into the fire bar through the air inlet 11, the gas and primary air are mixed in the main airflow channel in the fire bar, and then the gas is ignited after being mixed with secondary air at the fire hole 41 of the head part 4 to generate high-temperature flue gas. Since the burner is prior art, the specific structure of the burner will not be described again.

[0041] Specifically, as shown in Figure 2 and Figure 3As shown, the fire row further comprises a sleeve plate 5 sleeved on the head 4, and an auxiliary air flow channel is formed between the sleeve plate 5 and the head 4. After the mixed gas of the gas and the air is mixed in the injection portion 1, the bending portion 2, the flow regulating portion 3 and the head 4, most of the mixed gas flows to the fire hole 41 to be ignited. The head 4 of the fire row is provided with a through hole communicating with the auxiliary air flow channel, and a small part of the mixed gas flows into the auxiliary air flow channel through the through hole and is ignited at the fire hole 41. In the auxiliary air flow channel, the flow rate of the mixed gas is relatively slow, so as to achieve the effect of stabilizing the flame.

[0042] Further, the injection portion 1 is in a flared structure from left to right along the left-right direction, so as to reduce the flow rate of the mixed gas in the injection portion 1, so that part of the dynamic pressure of the mixed gas is converted into static pressure, thereby improving the power of the mixed gas. The right end of the injection portion 1 is connected to the bending portion 2 in a smooth transition manner, so as to reduce the flow resistance of the mixed gas.

[0043] In the existing burner, the size of the air flow channel in the fire row with the bending structure of the injection portion is small, the pressure and velocity distribution of the mixed gas at the fire hole is uneven, which causes the flame to be twisted and deviated, so that the gas and air are not mixed sufficiently, thereby causing the problem of excessive smoke and high combustion noise caused by incomplete combustion of the gas.

[0044] To solve the above problems, as shown in Figure 2 and Figure 4 The present embodiment further provides a fire row, which comprises an injection portion 1, a bending portion 2, a flow regulating portion 3 and a head 4 which are sequentially communicated along the height direction of the fire row. The injection portion 1 is provided with an air inlet 11, and the top end of the head 4 is provided with a fire hole 41. The flow regulating portion 3 comprises a first portion 31 and a second portion 32 which are arranged side by side and communicated along the length direction (left-right direction in the figure) of the fire row, and the first portion 31 is located directly above the bending portion 2. Along the width direction (front-rear direction in the figure) of the fire row, the width D1 of the cross section of the air flow channel of the first portion 31 is smaller than the width D2 of the cross section of the air flow channel of the second portion 32. Since the first portion 31 is located directly above the bending portion 2, along the width direction of the fire row, the width D1 of the cross section of the air flow channel of the first portion 31 is smaller than the width D2 of the cross section of the air flow channel of the second portion 32, which avoids the mixed gas from flowing directly to the first portion 31 and the fire hole 41 directly above the first portion 31 along the height direction of the fire row after passing through the bending portion 2, so as to reduce the flow rate of the mixed gas flowing to the first portion 31 and increase the flow rate of the mixed gas flowing to the second portion 32 at the same time, thereby prolonging the mixing time of most of the gas and air, so that the gas and air are mixed more sufficiently, and the mixed gas of the gas and air flows uniformly to the fire hole 41 of the head 4, so as to ensure that the injection speed of the mixed gas at the fire hole 41 is more uniform, thereby achieving the full and stable combustion of the mixed gas at the fire hole 41, avoiding the flame from being twisted and deviated, and effectively reducing the problems of excessive smoke and high combustion noise.

[0045] In one embodiment, the rectifier 3 further includes a third part 33, which has a first end and a second end along the length of the fire bar. The first end is integrally connected to the first part 31, and the second end is integrally connected to the second part 32. The third part 33 is located between the first part 31 and the second part 32, and the first part 31 is transitionally connected to the second part 32 through the third part 33.

[0046] Specifically, along the length of the firebox, the width of the cross-section of the airflow channel in the third part gradually increases from the first end towards the second end. For example... Figure 4 As shown, along the width direction of the fire bar, the width D3 of the cross-section of the airflow channel of the third part 33 is such that D1≤D3≤D2. The aforementioned width D3 is an indefinite value; the maximum value of width D3 is equal to the width D2, and the minimum value of width D3 is equal to the width D1. Specifically, the third part 33 has a flared structure from right to left, and the first end (right end) of the third part 33 is a small opening, while the second end (left end) of the third part 33 is a large opening. This ensures a smooth transition between the third part 33 and the first part 31 and the second part 32, respectively. This allows the flow rate of the mixed gas in the airflow channel of the third part 33 to change linearly along the length direction of the fire bar, ensuring a uniform distribution of the mixed gas at the fire hole 41.

[0047] It should be noted that the airflow channel of the rectifier 3 extends along the length of the fire bar on both sides 30 and along the height of the fire bar. Since both sides 30 at the left and right ends of the rectifier 3 are vertically upward, the mixed gas in the airflow channel of the rectifier 3 flows vertically upward along the two sides 30 to the head 4, avoiding the generation of vortices in the mixed gas at the two sides 30 that would cause the flames at the fire holes 41 on the left and right sides of the fire bar to become skewed.

[0048] In one embodiment, such as Figure 4 As shown, along the length of the burner, the length of the rectifying section 3 is L, the length of the first section 31 is L1, the length of the second section 32 is L2, and the length of the third section 33 is L3. Therefore, L = L1 + L2 + L3, and 0.2 ≤ L1 / L ≤ 0.4, 0.35 ≤ L2 / L ≤ 0.53. Specifically, the length L1 of the first section 31 is designed according to the length of the bend in the bend of the bending section 2 along the length of the burner. The percentage of the first section 31 to the total length of the rectifying section 3 is 20%, 25%, 30%, 35%, or 40%, etc., to ensure that the lengths of the first section 31 and the bend are compatible along the length of the burner, avoiding excessive mixed gas at the right end of the burner. The second part 32 accounts for 35%, 40%, 45%, 50% or 53% of the total length of the rectifier part 3, etc., to ensure that the flow rate of the mixed gas in the airflow channels of the second part 32 and the first part 31 is approximately the same, so as to achieve a uniform distribution of the mixed gas in the rectifier part 3.

[0049] In one embodiment, as shown in Figure 2 and Figure 4 the second part 32 has two side walls along the width direction of the fire grate (the front-rear direction in the figure) and each side wall has a bulge 321 formed by bulging outward, and the bulge 321 on one side wall along the width direction of the fire grate is opposite to the bulge 321 on the other side wall along the width direction of the fire grate and encloses a vertical channel. Specifically, the vertical channel 321 extends along the height direction of the fire grate, and the bottom of the vertical channel 321 is communicated with the bending part 2, and the top of the vertical channel 321 is communicated with the head part 4. Specifically, the two side walls of the second part 32 have two bulges 321 formed by bulging outward toward the outside of the fire grate, and the two bulges 321 are arc-shaped profiles, and the two profiles are opposite to each other and enclose the vertical channel 321. By arranging a plurality of vertical channels 321, the mixed gas is guided to flow along Figure 3 the direction indicated by the arrow in the figure, that is, vertically from the bottom to the top of the fire hole 41 of the head part 4, so as to avoid the mixed gas flowing obliquely to the upper left from the bending part 2, thereby avoiding the flame at the fire hole 41 of the left end of the fire grate from tilting.

[0050] As shown in Figure 2 and Figure 5 the upper part of the bending part 2 is provided with a concave platform 21 which is concave inward, and the concave platform 21 is located directly below the first part 31. By arranging the concave platform 21, the resistance of the mixed gas flowing to the first part 31 is increased, the width of the cross section at the upper right position of the bending part 2 is reduced, so as to avoid too much mixed gas flowing directly along the vertical direction from the bottom to the top into the first part 31 after passing through the bending part, and guide the mixed gas to flow toward the second part 32 (i.e. the upper left of the fire grate), so as to make the mixed gas flow uniformly to the first part 31 and the second part 32.

[0051] Further, as shown in Figure 1 and Figure 2 the concave platform 21 is roughly triangular, and the concave platform 21 has a flow guide edge 211 which is inclined toward the second part 32 along the height direction of the fire grate, that is, the flow guide edge 211 is inclined toward the upper left of the fire grate, so as to guide the mixed gas to flow toward the second part 32.

[0052] As shown in Figure 5 along the width direction of the fire grate, the widths of the airflow channels corresponding to the bending part 2, the concave platform 21 and the first part 31 are gradually reduced. The width of the airflow channel of the bending part 2 along the width direction of the fire grate is D6, the width of the airflow channel of the concave platform 21 along the width direction of the fire grate is D5, and D6>D5>D1, so as to gradually increase the flow resistance of the bending part 2, the concave platform 21 and the first part 31, and avoid too much mixed gas flowing directly from the bending part to the first part 31.

[0053] The gas water heater also includes the above-mentioned burner, and the width of the cross section of the gas flow passage of the first part 31 is smaller than the width of the cross section of the gas flow passage of the second part 32 along the width direction of the fire grate, so that most of the mixed gas of the gas and the air directly flows to the first part 31 along the height direction of the fire grate after passing through the bending part 2 and then flows to the fire hole 41 directly above the first part 31 through the first part 31, the flow of the mixed gas flowing to the first part 31 is reduced, the flow of the mixed gas flowing to the second part 32 is increased, the mixing time of the gas and the air is prolonged, the gas and the air are more fully mixed, the mixed gas of the gas and the air uniformly flows to the fire hole 41 of the head part 4, the injection speed of the mixed gas at the fire hole 41 is more uniform, the mixed gas is fully and stably combusted at the fire hole 41, the flame is prevented from being twisted and deviated, and the problems of excessive flue gas and high combustion noise are effectively reduced.

[0054] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited by the above embodiments. Without departing from the spirit and scope of the present application, various changes and modifications can be made to the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A fire grate, characterised in that, The fire row comprises, from bottom to top along the height direction, an ejecting part (1), a bending part (2), a rectifying part (3) and a head part (4), the ejecting part (1) is provided with an air inlet (11), and the head part (4) is provided with a fire hole (41) at the top end. Along the length direction of the fire row, the rectifying part (3) comprises a first part (31) and a second part (32) arranged side by side and connected, the first part (31) is located directly above the bending part (2); along the width direction of the fire row, the width of the cross section of the airflow channel of the first part (31) is smaller than that of the second part (32).

2. The fire grate of claim 1, wherein, The rectifying part (3) further comprises a third part (33), the third part (33) has a first end and a second end along the length direction of the fire row, the first end is connected with the first part (31), and the second end is connected with the second part (32).

3. The fire grate of claim 2, wherein, Along the length direction of the fire row, the width of the cross section of the airflow channel of the third part (33) gradually increases from the first end to the second end.

4. The fire grate of claim 2, wherein, Along the length direction of the fire row, the length of the rectifying part (3) is L, the length of the first part (31) is L1, and the length of the second part (32) is L2, then 0.2≤L1 / L≤0.4 and 0.35≤L2 / L≤0.

53.

5. The fire grate of claim 1, wherein, The bending part (2) is provided with a concave platform (21) concave inward above the bending part (2), and the concave platform (21) is located directly below the first part (31).

6. The fire grate of claim 5, wherein, Along the width direction of the fire row, the widths of the airflow channels corresponding to the bending part (2), the concave platform (21) and the first part (31) decrease respectively.

7. The fire grate of claim 1, wherein, Along the width direction of the fire row, the two side walls of the second part (32) are respectively convex outward to form convexities (321), and the convexity on one side wall of the second part (32) is opposite to the convexity (321) on the other side wall of the second part (32) and encloses a vertical channel.

8. The fire grate of any one of claims 1 to 7, wherein, The two side edges (30) of the rectifying part (3) extend along the height direction of the fire row.

9. Burner, characterized in that The fire row comprises the fire row according to any one of claims 1-8.

10. A gas water heater characterised by, The combustor comprises the combustor according to claim 9.

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