Fire grate, burner and gas water heater

Abstract

The utility model discloses a fire grate, a combustor and a gas water heater, the fire grate comprises a fire grate body, a combustion cover and a flow equalizing plate; the fire grate body is provided with a gas channel and a gas outlet communicated with the gas channel; the combustion cover covers the air outlet and is provided with a plurality of fire holes which are distributed at intervals in the length direction; the flow equalizing plate is arranged in the gas channel, is opposite to the combustion cover and is arranged at an interval with the combustion cover, a plurality of flow equalizing holes are formed in the flow equalizing plate at intervals in the length direction, and the flow equalizing plate extends to the other end of the fire grate body from one end of the fire grate body in the length direction; according to the technical scheme, air inlet resistance is increased through secondary pressure equalizing and flow dividing, so that air outlet of the fire holes is uniform, the height of flames at the head of the fire grate is reduced to be the same as that of flames at the tail, the uniformity of the overall height of the fire grate combustion flames is improved, the combustion space is effectively shortened, heat loss is reduced, and CO emission is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a fire grate, a burner and a gas water heater. Background Art

[0002] The existing burner fire row has an uneven distribution of gas flow velocity in the length direction. The flame is short at the position with lower gas velocity, and high at the position with higher gas velocity, resulting in uneven flame height distribution, large heat loss and high CO emissions. Utility Model Content

[0003] The main purpose of the utility model is to provide a fire grate, aiming to achieve uniformity in the height distribution of the burning flame of the fire grate.

[0004] In order to achieve the above-mentioned purpose, the fire grate proposed by the utility model comprises:

[0005] The fire bar body is provided with a gas passage and a gas outlet connected with the gas passage;

[0006] A combustion cover, which is arranged on the gas outlet, and the combustion cover is provided with a plurality of fire holes arranged at intervals along the length direction; and

[0007] A flow equalizing plate is arranged in the gas channel and is opposite to and spaced from the combustion cover. The flow equalizing plate is provided with a plurality of flow equalizing holes spaced along the length direction. The flow equalizing plate extends from one end of the length direction of the fire bar body to the other end of the fire bar body.

[0008] Optionally, the inner wall of the gas channel is provided with a step portion, and the flow equalizing plate overlaps and cooperates with the step portion.

[0009] Optionally, there are two step portions, which are respectively arranged on both sides of the gas channel in the width direction, and the step portions extend from one end of the fire bar body in the length direction to the other end of the fire bar body.

[0010] Optionally, the total opening area of ​​the plurality of flow-balancing holes is a, and the total opening area of ​​the plurality of fire holes is b, wherein the ratio of a to b is not less than 0.65 and not greater than 0.85.

[0011] Optionally, a plurality of the flow balancing holes are evenly arranged on the flow balancing plate, and the flow balancing plate is symmetrically arranged in the gas channel.

[0012] Optionally, the combustion cover includes a top plate, and the fire holes include first fire holes penetrating the top plate, and a plurality of the first fire holes are arranged at intervals along the length direction of the top plate.

[0013] Optionally, the combustion cover also includes two side plates respectively arranged on both sides of the top plate in the width direction, the side plates are inserted in the gas channel, the fire hole also includes a plurality of second fire holes arranged at intervals along the length direction of the fire bar body, the plurality of second fire holes are arranged at the connection between the top plate and the side plates, and extend from the top plate to the side plates, the fire bar body is provided with a plurality of side holes at intervals along the length direction, and the plurality of side holes are connected to the second fire holes.

[0014] Optionally, side plates are respectively provided on both sides of the flow equalizing plate in the width direction, and the side plates are inserted into the combustion cover.

[0015] Optionally, the side plate is provided with a plurality of air passage grooves arranged at intervals along the length direction of the fire bar body, and the air passage grooves are connected to the second fire holes.

[0016] The utility model also provides a burner, which comprises a fire grate.

[0017] The utility model also provides a gas water heater, which comprises a burner.

[0018] The technical solution of the utility model is to arrange a flow equalizing plate in the gas channel, so that the flow equalizing plate extends from one end of the fire grate body in the length direction to the other end of the fire grate body, and divides the gas channel into two parts separated by the flow equalizing plate. When the fire grate takes in air, the gas is subjected to a pressure-equalizing mixing and distribution under the flow equalizing plate, enters the gas channel above the flow equalizing plate through the flow equalizing hole, and then undergoes a secondary pressure-equalizing mixing and distribution through the combustion cover before being ejected and burned through the fire hole. When the gas channel takes in air, the secondary pressure-equalizing diversion can increase the air intake resistance to make the gas outlet of the fire hole uniform, reduce the flame height at the head of the fire grate to be the same as the flame height at the tail, increase the uniformity of the overall height of the fire grate combustion flame, effectively shorten the combustion space, reduce heat loss, and reduce CO emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a structural schematic diagram of an embodiment of the fire grate of the utility model;

[0021] Figure 2 An exploded view of an embodiment of a fire grate of the utility model;

[0022] Figure 3 for Figure 2 A magnified view at position A;

[0023] Figure 4 This is a structural schematic diagram of the combustion cover and the flow equalizing plate in the fire grate of the utility model;

[0024] Figure 5 It is a schematic diagram of the arrangement of the flow-balancing holes in the fire grate of the utility model;

[0025] Figure 6 This is a schematic structural diagram of an embodiment of a burner of the utility model;

[0026] Figure 7 It is a structural schematic diagram of the secondary air inlet in the burner of the utility model.

[0027] Description of Figure Numbers:

[0028] Label name Label name 100 Fire row 24 First fire hole 10 Fire row body 25 Second fire hole 11 Air Inlet 30 Current balancing plate 12 Gas channel 31 Flow-equalizing hole 13 Air outlet 32 Side panels 14 Step 33 Air tank 15 Side hole 200 Burner 20 Combustion cover 210 Combustion Chamber 21 roof 220 Ignition components 22 Sideboard 230 Flame Sensing Components 23 End Plate 240 Secondary air intake

[0029] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] "Energy conservation and emission reduction" has become the dominant content of my country's energy policy. As the terminal of energy consumption, the household gas appliance industry is also conducting product innovation and research and development with the goal of "high-efficiency gas appliances". Therefore, in the face of strong market demand, forced exhaust gas water heaters will inevitably become the mainstream of the market. A comprehensive and systematic analysis of the burners of forced exhaust gas water heaters and the optimization of the parameters of the water heaters will improve the comprehensive functions of domestic gas water heaters, allowing modern families to use safe, convenient, efficient and low-pollution gas water heaters, which has significant economic, social and environmental benefits.

[0034] The existing fire grate structure for gas water heaters will have uneven flame distribution during combustion. The flame is shorter at the side of the fire grate close to the nozzle due to lower gas velocity; the flame is higher at the side of the fire grate far from the nozzle due to higher gas velocity, resulting in uneven flame distribution and affecting the thermal utilization rate of the gas water heater.

[0035] To this end, the utility model provides a fire grate 100 .

[0036] Reference Figures 1 to 5 In an embodiment of the utility model, the fire grate 100 includes a fire grate body 10, a combustion cover 20 and a flow equalizing plate 30; the fire grate body 10 is provided with a gas channel 12 and an air outlet 13 connected to the gas channel 12; the combustion cover 20 is covered on the air outlet 13, and the combustion cover 20 is provided with a plurality of fire holes arranged at intervals along the length direction; the flow equalizing plate 30 is arranged in the gas channel 12, and is opposite to the combustion cover 20 and is arranged at intervals, and the flow equalizing plate 30 is provided with a plurality of flow equalizing holes 31 arranged at intervals along the length direction, and the flow equalizing plate 30 extends from one end of the fire grate body 10 in the length direction to the other end of the fire grate body 10.

[0037] In this embodiment, the fire grate body 10 is formed by splicing two roughly symmetrical sheet metal parts, the gas channel 12 is composed of a tubular gas delivery channel and a box-shaped air outlet cavity, the air outlet 13 is opened in the air outlet cavity, and the air outlet cavity is roughly a long box-shaped symmetrical structure. The tubular gas delivery channel of the fire grate body 10 has two sections, one of which is located at the lower end of the air outlet cavity and is roughly a straight section. An air inlet 11 is provided at the initial end of the straight section, and the other section is bent upward from the straight section and connected to the air outlet cavity. After the gas is mixed with air, it enters the tubular The gas delivery channel enters the gas outlet chamber from the tubular gas delivery channel. The combustion cover 20 covers the gas outlet 13 and together with the gas outlet chamber forms a mixing chamber. The equalizing plate 30 is a long symmetrical structure, extending from one end of the fire bar body 10 to the other end, dividing the mixing chamber into two layers, so that the gas is once pressure-equalized, mixed and distributed in the mixing chamber below the equalizing plate 30, and then enters the mixing chamber above the equalizing plate 30 for secondary mixing and distribution, and then is ejected from the fire hole for combustion, forming a highly distributed flame on the upper end surface of the combustion cover 20.

[0038] The technical solution of the utility model is to set a flow equalizing plate 30 in the gas channel 12, so that the flow equalizing plate 30 extends from one end of the fire grate body 10 in the length direction to the other end of the fire grate body 10, and divide the gas channel 12 into two parts separated by the flow equalizing plate 30. When the fire grate takes in air, the gas is subjected to a pressure-equalizing mixing and distribution under the flow equalizing plate 30, enters the gas channel 12 above the flow equalizing plate 30 through the flow equalizing hole 31, and then passes through the combustion cover 20 for a secondary pressure-equalizing mixing and distribution before being ejected and burned through the fire hole. When the gas channel 12 takes in air, the secondary pressure-equalizing diversion can increase the air intake resistance to make the gas outlet of the fire hole uniform, so that the flame height at the head of the fire grate is reduced to be the same as the flame height at the tail, thereby increasing the uniformity of the overall height of the fire grate combustion flame, effectively shortening the combustion space, reducing heat loss, and reducing CO emissions.

[0039] Combined with reference Figure 2 , Figure 3 As shown, in one embodiment, the inner wall of the gas channel 12 is provided with a step portion 14, and the flow equalizing plate 30 overlaps and cooperates with the step portion 14. In this embodiment, there are two step portions 14, which are provided on both sides of the width direction of the gas channel 12, and the step portion 14 extends from one end of the length direction of the fire bar body 10 to the other end of the fire bar body 10. The step portion 14 can facilitate the rapid positioning and installation of the flow equalizing plate 30, and can also provide a stable support for the flow equalizing plate 30.

[0040] Specifically, the sheet metal parts spliced ​​to form the fire bar 100 are convex to the inner side of the air outlet cavity at the position where the air outlet cavity is provided in the gas channel 12 to form a step portion 14. There are two step portions 14, which are arranged on both sides of the width direction of the air outlet cavity. The step portion 14 extends from one end of the length direction of the fire bar body 10 to the other end of the fire bar body 10. The two sides of the flow equalizing plate 30 are directly overlapped on the step portion 14, so that the cavity with a narrower width at the lower end of the gas channel 12 is separated from the cavity with a wider width at the upper end of the gas channel 12, forming a first mixing cavity and a second mixing cavity. The first mixing cavity and the second mixing cavity are connected only through the flow equalizing hole 31 on the flow equalizing plate 30.

[0041] In one embodiment, the total opening area of ​​the plurality of flow-balancing holes 31 is a, and the total opening area of ​​the plurality of fire holes is b, wherein the ratio of a to b is not less than 0.65 and not greater than 0.85.

[0042] In this embodiment, if Figure 4As shown, the plurality of fire holes include a first fire hole 24 and a second fire hole 25, and the sum of the opening areas of the plurality of fire holes is the sum of the opening areas of the plurality of first fire holes 24 and the plurality of second fire holes 25. In other embodiments, the plurality of fire holes may also be a plurality of first fire holes 24 or a plurality of second fire holes 25, and the sum of the opening areas of the plurality of fire holes is the sum of the opening areas of the plurality of first fire holes 24 or the sum of the opening areas of the plurality of second fire holes 25. Specifically, the sum of the areas of the equalizing holes 31 accounts for 65% to 85% of the sum of the areas of the fire holes.

[0043] Optionally, the ratio of a to b is 0.78. In this example, the total area of ​​the plurality of flow balancing holes 31 is approximately 420 mm 2 The total area of ​​multiple fire holes is approximately 535mm 2 The total area of ​​the multiple flow-balancing holes 31 accounts for 78% of the total area of ​​the multiple fire holes.

[0044] In one embodiment, a plurality of equalizing holes are evenly arranged on the equalizing plate, and the equalizing plate 30 is symmetrically arranged in the gas channel 12. Specifically, the equalizing holes 31 are evenly distributed on the equalizing plate 30, and the equalizing plate 30 is a symmetrical structure, the outlet cavity 13 is a long box-shaped symmetrical structure, and the equalizing plate 30 is also a long strip-shaped symmetrical structure. When the equalizing plate 30 is installed in the outlet cavity 13, whether it is installed forward or reverse, it will not be installed in the wrong position, and the equalizing holes 31 are also evenly arranged, so that the equalizing plate 30 is easy to install and prevent mistakes.

[0045] Combined with reference Figure 2 , Figure 4 As shown, in one embodiment, the combustion cover 20 includes a top plate 21, and the fire holes include first fire holes 24 that penetrate the top plate 21, and a plurality of first fire holes 24 are arranged at intervals along the length direction of the top plate 21. In this embodiment, the top plate 21 is generally in a U-shape or a V-shape that is concave downward, and the first fire holes 24 are generally arranged in the middle of the top plate 21. Compared with a top plate designed as a straight plate, the first fire holes 24 can have a relatively larger opening area, thereby achieving a larger contact area with oxygen during combustion.

[0046] Combined with reference Figure 2 , Figure 4 As shown, optionally, the combustion cover 20 also includes two side plates 22 respectively arranged on both sides of the top plate 21 in the width direction, the side plates 22 are inserted into the gas channel 12, and the fire holes also include a plurality of second fire holes 25 spaced apart along the length direction of the fire bar body 10, and the plurality of second fire holes 25 are arranged at the connection between the top plate 21 and the side plates 22, and extend from the top plate 21 to the side plates 22.

[0047] In this example, the side plates 22 are formed by extending the two side edges of the top plate 21 in the length direction toward the inside of the gas passage 12, and a second fire hole 25 is provided at the connection between the side plates 22 and the top plate 21. The second fire hole 25 is also in the shape of an elongated strip and extends from the side plates 22 to the top plate 21. Through the above arrangement, the second fire hole 25 also has a larger opening area, thereby further achieving a larger contact area with oxygen during combustion.

[0048] Combined with reference Figure 1 , Figure 3 As shown, further, the fire bar body 10 is provided with a plurality of side holes at intervals along the length direction, and the plurality of side holes are connected to the second fire hole.

[0049] In this example, when the combustion cover 20 and the flow equalizing plate 30 are assembled into the gas channel 12, since part of the second fire hole 25 is opened on the side plate 22, in order to avoid the inner wall of the gas channel 12 partially blocking the second fire hole 25, it is necessary to have a certain gap between the inner wall of the gas channel 12 and the second fire hole 25. Specifically, in this embodiment, by opening a plurality of side holes 15 corresponding to the second fire hole 25 on the inner wall of the gas channel 12, the side holes 15 are connected to the second fire hole 25, so that the second fire hole 25 will not cause partial obstruction to affect the combustion efficiency of the fire grate.

[0050] In this example, end plates 23 are provided on both sides of the top plate 21 in the length direction. Figure 2 , Figure 4 As shown, the end plate 23 is extended toward the interior of the mixing chamber and inserted into the gas channel 12. The end plate 23 is connected to the adjacent side plate 22, so that the bottom of the top plate 21 is enclosed by the end plate 23 and the side plate 22, and is spliced ​​with the top plate 21 to form a combustion cover 20.

[0051] Furthermore, side plates 32 are provided on both sides of the current equalizing plate 30 in the width direction. Figure 2 , Figure 4 As shown, the side plate 32 is located on a side of the flow balancing plate 30 facing the combustion cover 20 , and extends from one end of the flow balancing plate 30 to the other end of the flow balancing plate 30 , and the side plate 32 is inserted into the combustion cover 20 .

[0052] Specifically, by providing side plates 32 on both sides of the flow equalizing plate 30, the flow equalizing plate 30 can be plugged and connected to the combustion cover 20 through the side plates 32. When the combustion cover 20 and the flow equalizing plate 30 are assembled to the fire bar body 10, the flow equalizing plate 30 can be pre-assembled into place with the combustion cover 20 through the side plates 32, and then the flow equalizing plate 30 can be assembled to the fire bar body 10 together with the combustion cover 20, thereby facilitating the assembly of the flow equalizing plate 30 on the fire bar body 10.

[0053] In this embodiment, when the flow equalizing plate 30 is inserted into the combustion cover 20, the side plate 32 abuts against the inner side of the connection between the side plate 22 and the top plate 21. When the combustion cover 20 and the flow equalizing plate 30 are assembled to the fire bar body 10, the side plate 22 and the flow equalizing plate 30 abut against the step portion 14 at the same time.

[0054] Different from the above-mentioned embodiments, in other embodiments, the side plate 22 abuts against the step portion 14, and the current equalizing plate 30 is located at the upper end of the step portion 14 and does not abut against the step portion 14; or, in other embodiments, the current equalizing plate 30 abuts against the step portion 14, and the side plate 22 is located at the upper end of the step portion 14 and does not abut against the step portion 14.

[0055] Optionally, the side plate 32 is provided with a plurality of air passage grooves 33 arranged at intervals along the length direction of the fire bar body 10 , and the air passage grooves 33 are connected to the second fire holes 25 .

[0056] Specifically, the air groove 33 is arranged along the thickness direction of the side plate 32. When the flow equalizing plate 30 is inserted into the combustion cover 20 through the side plate 32, the side plate 32 abuts against the side plate 22, and the part of the second fire hole 25 located on the side plate 32 is connected to the air groove 33, so as to avoid the setting of the side plate 32 causing partial obstruction of the second fire hole 25 after the flow equalizing plate 30 is assembled, thereby affecting the gas outlet of the second fire hole 25.

[0057] Optionally, in conjunction with reference Figure 5 As shown, the flow balancing hole 31 is in a long strip shape and extends along the width direction of the flow balancing plate 30 .

[0058] In other embodiments, the flow balancing holes 31 may also be circular, square or irregular in shape, again without specific limitation. However, in general, the flow balancing holes 31 are roughly evenly distributed on the flow balancing plate 30, in order to make the second mixing chamber below the flow balancing plate 30 a pressure balancing chamber, so that the flow rate of the gas passing through is more uniform.

[0059] The utility model also provides a burner 200, which includes a combustion chamber 210 and a plurality of fire rows 100. Figure 6 , Figure 7 As shown, the specific structure of the fire bar 100 refers to the above embodiment. Since the burner 200 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, multiple fire bars 100 are arranged in the combustion chamber 210.

[0060] In this embodiment, the combustion chamber 210 is further provided with an ignition assembly 220 and a flame sensing assembly 230. A secondary air inlet 240 is provided at the bottom of the combustion chamber 210, and the secondary air inlet 240 is used for secondary air intake of the combustion chamber 210 to supply oxygen for the combustion of the fire grate.

[0061] The utility model also proposes a gas water heater, which includes a burner 200. The specific structure of the burner 200 refers to the above embodiment. Since the gas water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0062] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fire grate, characterized in that: include: The fire bar body is provided with a gas passage and a gas outlet connected with the gas passage; A combustion cover, which is arranged on the gas outlet, and the combustion cover is provided with a plurality of fire holes arranged at intervals along the length direction; and A flow equalizing plate is arranged in the gas channel and is opposite to and spaced from the combustion cover. The flow equalizing plate is provided with a plurality of flow equalizing holes spaced along the length direction. The flow equalizing plate extends from one end of the length direction of the fire bar body to the other end of the fire bar body.

2. The fire bar according to claim 1, characterized in that: The inner wall of the gas channel is provided with a step portion, and the flow balancing plate overlaps and cooperates with the step portion.

3. The fire bar according to claim 2, characterized in that: There are two step portions, which are respectively arranged on both sides of the gas channel in the width direction, and the step portions extend from one end of the fire bar body in the length direction to the other end of the fire bar body.

4. The fire bar according to claim 1, characterized in that: The total opening area of ​​the plurality of flow-balancing holes is a, and the total opening area of ​​the plurality of fire holes is b, wherein the ratio of a to b is not less than 0.65 and not greater than 0.

85.

5. The fire bar according to claim 1, characterized in that: The plurality of flow balancing holes are evenly arranged on the flow balancing plate, and the flow balancing plate is symmetrically arranged in the gas channel.

6. The fire bar according to any one of claims 1 to 5, characterized in that: The combustion cover comprises a top plate, and the fire holes comprise first fire holes penetrating the top plate, and a plurality of the first fire holes are arranged at intervals along a length direction of the top plate.

7. The fire bar according to claim 6, characterized in that: The combustion cover also includes two side plates respectively arranged on both sides of the top plate in the width direction, the side plates are inserted into the gas channel, the fire hole also includes a plurality of second fire holes arranged at intervals along the length direction of the fire bar body, the second fire hole is arranged at the connection between the top plate and the side plate, and extends from the top plate to the side plate, the fire bar body is provided with a plurality of side holes at intervals along the length direction, and the plurality of side holes are connected to the second fire hole.

8. The fire bar according to claim 7, characterized in that: Side plates are respectively provided on both sides of the flow equalizing plate in the width direction, and the side plates are inserted into the combustion cover.

9. The fire bar according to claim 8, characterized in that: The side plate is provided with a plurality of air passage grooves arranged at intervals along the length direction of the fire bar body, and the air passage grooves are communicated with the second fire holes.

10. A burner, characterized in that: Comprising the fire grate as claimed in any one of claims 1 to 9.

11. A gas water heater, characterized in that: Comprising the burner as claimed in claim 10.

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