Boiler explosion venting device

Abstract

The utility model discloses a boiler explosion venting device which comprises a negative pressure combustion chamber, an explosion venting assembly and a limiting device, the negative pressure combustion chamber is provided with a first containing cavity and a through hole, the through hole is communicated with the first containing cavity, the explosion venting assembly comprises a base and a cover body, the base is arranged in the negative pressure combustion chamber, the base is provided with an explosion venting hole communicated with the through hole, and the cover body is in pivot joint with the base. The cover body can rotate under the action of gravity to cover the explosion venting hole, and the limiting device is arranged in the negative pressure combustion chamber and can abut against the cover body to limit the maximum included angle between the limiting device and the horizontal plane to be smaller than 90 degrees. During normal operation, the cover body can cover the explosion venting hole, when deflagration occurs, pressure waves in the combustion chamber impact the cover body, the cover body is rotationally separated from the explosion venting hole, internal impact waves are released through the explosion venting hole, and the rotating position of the cover body is limited by the limiting device, so that the situation that the cover body overturns and cannot fall back is avoided; the cover body can automatically fall back to cover the explosion venting hole under the action of gravity, and the equipment continues to operate.

Description

Technical Field

[0001] The utility model relates to the technical field related to heating equipment, and in particular to a boiler explosion relief device. Background Art

[0002] Deflagration refers to the instantaneous combustion of the combustible mixture accumulated in the combustion chamber. The intense combustion causes the pressure in the combustion chamber to rise suddenly. Some large burners, such as gas furnaces, occasionally experience deflagration during use. There are many reasons for deflagration. For example, in the ignition stage, the premixed gas air-fuel ratio is not appropriate, which makes ignition difficult and causes deflagration. For another example, an abnormality occurs in the burner during operation, such as ignition failure, unstable combustion, or insufficient pre-cleaning time during multiple ignitions, which causes gas to accumulate in the combustion chamber and cause deflagration. Therefore, all gas boilers have explosion relief devices. In the prior art, traditional gas boilers are generally blast-type positive pressure combustion. The explosion relief devices are all pressed in the explosion relief position of the boiler with springs. When the boiler is burning normally, the positive pressure of the furnace is less than the spring preload, and the explosion relief device will not have smoke discharge. When the burner deflagrates, the positive pressure of the furnace instantly rises sharply, and the explosion relief device is forcefully pushed open to ensure the safety of the boiler. The explosion relief device has a complex structure, and there are strict requirements for the calculation and selection of the compression spring. Utility Model Content

[0003] The utility model aims to provide a novel boiler explosion relief device, which has a simple structure and does not need to be compressed by a spring. It is used in a boiler with negative pressure combustion in the furnace, is convenient and practical, and has a good effect.

[0004] According to a first aspect of the utility model, a boiler explosion relief device includes: a negative pressure combustion chamber, an explosion relief assembly and a limiting device, the negative pressure combustion chamber has a first cavity and a through hole, the through hole is connected to the first cavity, the explosion relief assembly includes a base and a cover body, the base is arranged in the negative pressure combustion chamber, the base is provided with an explosion relief hole connected to the through hole, the cover body is pivotally connected to the base, and the cover body can be rotated under the action of gravity to cover the explosion relief hole, the limiting device is arranged in the negative pressure combustion chamber, and the limiting device can abut against the cover body to limit its maximum angle relative to the horizontal plane to less than 90°.

[0005] A boiler explosion relief device according to an embodiment of the utility model has at least the following beneficial effects: a negative pressure combustion chamber is used for combustion heating. When in use, combustible gas is introduced into the first cavity for combustion, the base is connected to the negative pressure combustion chamber, and the explosion relief hole is connected to the first cavity. During normal combustion, the slight negative pressure in the combustion of the first cavity ensures that the cover body can tightly cover the explosion relief hole, and no external air can enter the combustion chamber through the explosion relief device. When a deflagration occurs, a positive pressure impacting the cover body is instantly generated in the combustion chamber, and the cover body is rotated to separate from the explosion relief hole so that the internal shock wave is released through the explosion relief hole. The rotation position of the cover body is limited by the limit device so that it will not overturn and cannot fall back. After the deflagration ends, the cover body can automatically fall back to cover the explosion relief hole under the action of gravity, so that the equipment continues to operate. The explosion pressure can be automatically released through the explosion relief component to protect the burner.

[0006] According to some embodiments of the present invention, the through hole and the base are both arranged above the negative pressure combustion chamber.

[0007] According to some embodiments of the utility model, the limiting device includes a shell, which is arranged above the negative pressure combustion chamber, and there is a gap between the bottom surface of the shell part and the top of the negative pressure combustion chamber, and the cover body is located at the gap.

[0008] According to some embodiments of the utility model, the shell has a second cavity, the second cavity is connected to the first cavity, the shell can receive combustion flue gas, and a condensing heat exchanger is provided in the second cavity, and the condensing heat exchanger is used to absorb residual heat of the combustion flue gas.

[0009] According to some embodiments of the present invention, when the cover body abuts against the shell, an angle of the cover body relative to the horizontal plane is less than 20°.

[0010] According to some embodiments of the utility model, the explosion relief components are provided in plurality, the through holes are provided in plurality, the plurality of explosion relief components are arranged in the negative pressure combustion chamber at intervals, and the explosion relief holes are connected to the corresponding through holes.

[0011] According to some embodiments of the present invention, the cover body is provided with a first pivotal portion, the base is provided with a second pivotal portion, and the first pivotal portion is pivotally connected to the second pivotal portion.

[0012] According to some embodiments of the utility model, the base is provided with an explosion-relief pipe, the explosion-relief hole is configured as a through hole in the explosion-relief pipe, and the cover body can cover the end of the explosion-relief pipe away from the base.

[0013] According to some embodiments of the present invention, the cover body is provided with an annular groove, and the annular groove can cooperate with the end of the explosion-proof pipe.

[0014] According to some embodiments of the present invention, the cover body is spherical.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 Schematic diagram of burners in some embodiments of the utility model;

[0018] Figure 2 for Figure 1 A cross-sectional view of

[0019] Figure 3 Schematic diagram of explosion relief components of some embodiments of the utility model;

[0020] Figure 4 for Figure 3 sectional view of .

[0021] Figure 5 for Figure 2 A local enlarged view of point A in the figure.

[0022] Reference numerals:

[0023] Negative pressure combustion chamber 100, first cavity 110, through hole 120;

[0024] The explosion relief assembly 200, the base 210, the explosion relief hole 211, the second pivoting portion 212, the explosion relief pipe 213, the cover 220, the first pivoting portion 221, and the annular groove 222;

[0025] The limiting device 300 , the shell 310 , the second cavity 311 , and the condensing heat exchanger 312 . DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Reference Figure 1 to Figure 2According to a first aspect of the utility model, a boiler explosion relief device includes a negative pressure combustion chamber 100, an explosion relief assembly 200 and a limiting device 300. The negative pressure combustion chamber 100 has a first cavity 110 and a through hole 120, and the through hole 120 is connected to the first cavity 110. The explosion relief assembly 200 includes a base 210 and a cover 220. The base 210 is arranged in the negative pressure combustion chamber 100. The base 210 is provided with an explosion relief hole 211 connected to the through hole 120. The cover 220 is pivotally connected to the base 210, and the cover 220 can rotate under its own gravity to cover the explosion relief hole 211. The limiting device 300 is arranged in the negative pressure combustion chamber 100, and the limiting device 300 can abut against the cover 220 to limit its maximum angle relative to the horizontal plane to less than 90°. The negative pressure combustion chamber 100 is used for combustion heating. When in use, combustible gas is introduced into the first cavity 110 for combustion, the base 210 is connected to the negative pressure combustion chamber 100, and the explosion venting hole 211 is connected to the first cavity 110. During normal combustion, the slight negative pressure in the combustion of the first cavity 110 ensures that the cover body 220 can tightly cover the explosion venting hole 211, and no external air will enter the combustion chamber through the explosion venting device. When a deflagration occurs, a positive pressure impacting the cover body 220 is instantly generated in the combustion chamber, and the cover body 220 is rotated to disengage from the explosion venting hole 211 so that the internal shock wave is released through the explosion venting hole 211. The rotation position of the cover body 220 is limited by the limit device 300 so that it will not overturn and cannot fall back. After the deflagration ends, the cover body 220 can automatically fall back under the action of gravity to cover the explosion venting hole 211, so that the equipment continues to operate. The explosion pressure can be automatically released through the explosion venting assembly 200 to protect the burner.

[0030] Specifically, the burner can be a gas water heater or a gas steam boiler, which converts the combustible gas into heat energy through a chemical reaction. The combustible gas used can be natural gas, liquefied petroleum gas and other gases, and the heat energy generated can be used for heating and other purposes. The main combustion area in a general negative pressure burner is the negative pressure combustion chamber 100. In the prior art, the negative pressure burner is generally an open combustion form, and an exhaust fan is arranged at the smoke exhaust. The exhaust fan drives a slight negative pressure inside the burner, and an ejector is usually used to inject gas at the gas inlet of the burner in order to mix the air, so that there is also a gap connected to the outside here. In the prior art, explosion relief is generally carried out through these two parts connected to the outside. Although the upper smoke exhaust fan can also relieve explosion, its path from the combustion chamber is relatively long, and the explosion relief ability is relatively poor. The gap at the gas inlet is small, and the explosion relief ability is also relatively poor. In this embodiment, the negative pressure combustion chamber 100 is generally provided with a combustible gas supply output port and an ignition The negative pressure combustion chamber 100 is generally provided with a heat exchanger 312, which can be a heat exchange component such as a heat exchange tube. The medium in the heat exchanger 312 can exchange heat with the combustion heat in the negative pressure combustion chamber 100. In normal use, the cover body 220 in the explosion relief assembly 200 covers the explosion relief hole 211 under the force of its own gravity and the pressure difference between the inside and the outside. When the negative pressure combustion chamber 100 deflagrates, the first cavity 110 is filled with the gas in the first cavity 110. The pressure suddenly increases, and the impact force generated by the deflagration is much greater than the gravity of the cover 220. The cover 220 is pushed open, the explosion hole 211 is opened, and the first chamber 110 is connected to the outside world. The explosion pressure in the first chamber 110 can be released at the explosion hole 211, thereby effectively protecting the equipment and reducing the occurrence of pressure holding and damage to the equipment. After the deflagration ends, the pressure in the first chamber 110 returns to normal, and the cover 220 re-covers the explosion hole 211 under its own gravity, and the burner continues to burn normally. Compared with the prior art, the explosion relief assembly 200 of this embodiment can be directly connected to the negative pressure combustion chamber 100, and the distance to the negative pressure combustion chamber 100 is short, and the explosion relief capacity can be greatly improved.

[0031] Reference Figure 1 to Figure 2 In some embodiments of the present invention, the through hole 120 and the base 210 are both disposed above the negative pressure combustion chamber 100, which can facilitate the explosion relief assembly 200 to release the explosion pressure.

[0032] Specifically, the negative pressure combustion chamber 100 may be a box body, and the box body may contain a first volume cavity 110 for combustion. During deflagration, the impact on the smoke side in the combustion chamber is relatively large, and the smoke side is above the negative pressure combustion chamber 100. The through hole 120 is disposed above the negative pressure combustion chamber 100 to facilitate the release of the deflagration pressure.

[0033] It should be noted that the through hole 120 and the base 210 are not limited to the above embodiments, and other embodiments may also be adopted. For example, the through hole 120 and the base 210 may also be arranged on the side of the negative pressure combustion chamber 100 to release the explosion pressure.

[0034] Reference Figure 1 to Figure 2 and Figure 5 In some embodiments of the present invention, the limiting device 300 includes a shell 310, which is disposed above the negative pressure combustion chamber 100, and a gap is formed between a portion of the bottom surface of the shell 310 and the top of the negative pressure combustion chamber 100, and the cover 220 is located at the gap. Through the above structure, the cover 220 can abut against the bottom wall of the shell 310 when rotating, so that the rotation angle of the cover 220 is limited by the shell 310, so that the cover 220 will not overturn, and can automatically return to cover the explosion relief hole 211 under the action of its own gravity, so as to keep the burner working normally.

[0035] Specifically, the shell 310 can be a sheet metal part or a box body. The shell 310 is arranged above the negative pressure combustion chamber 100. The negative pressure combustion chamber 100 can be a box body with a first cavity 110. The top of the box body is provided with an explosion relief assembly 200, and the top of the box body is also provided with a shell 310, and there is a gap between the shell 310 and the negative pressure combustion chamber 100. The shell 310 can be a sheet metal part or a box body. The explosion relief assembly 200 is located in the gap, and the cover body 220 is also located in the gap. When the explosion relief assembly 200 is working, the explosion relief hole 211 is opened by flipping the cover body 220, and then the explosion relief hole 211 is opened by the self-expansion. The cover body 220 automatically returns to its original position due to its own gravity to cover the explosion-proof hole 211. However, when the cover body 220 is flipped at an angle that is too large, it will be unable to return to its original position. For example, when the cover body 220 is flipped over more than 90 degrees relative to the horizontal plane, it will fall in a direction away from the explosion-proof hole 211, making it impossible to close the explosion-proof hole 211, affecting the operation of the burner. The cover body 220 is disposed between the gap between the shell body 310 and the negative pressure combustion chamber 100, so that the rotation angle of the cover body 220 is limited by the shell body 310, so that the cover body 220 will not be flipped excessively and can automatically return to its original position due to its own gravity to cover the explosion-proof hole 211, so as to keep the burner working normally.

[0036] It should be noted that the limiting device 300 is not limited to the above-mentioned embodiment, and other embodiments may also be adopted. For example, the limiting device 300 may also be a limiting member, which can be set on one side of the cover body 220. After the cover body 220 is rotated and opened, it can abut against the limiting member. The limiting member can limit the cover body 220 from excessively flipping.

[0037] Reference Figure 1 to Figure 2In some embodiments of the present invention, the housing 310 has a second cavity 311, which is connected to the first cavity 110, and the housing 310 can receive combustion flue gas. A condensing heat exchanger 312 is provided in the second cavity 311, and the condensing heat exchanger 312 is used to absorb the residual heat of the combustion flue gas. Through the above structure, the housing 310 can be used to receive flue gas, and the provided condensing heat exchanger 312 can further utilize the residual heat of the flue gas for heat exchange, and the bottom wall of the housing 310 can also cooperate with the cover 220 to limit its rotation angle.

[0038] Specifically, the shell 310 can be a smoke exhaust box for collecting smoke, and the second cavity 311 in the shell 310 is connected to the first cavity 110. A smoke exhaust port for smoke exhaust can be set on the shell 310, and the smoke exhaust port can be connected to the second cavity 311. The smoke generated by the combustion in the first cavity 110 flows upward to the second cavity 311 of the shell 310, and then is discharged through the smoke exhaust port. The smoke has heat, and a condensing heat exchanger 312 can be set in the second cavity. The condensing heat exchanger 312 can be a heat exchange tube. The medium in the heat exchange tube can be heated by the waste heat of the combustion smoke, and can be further heated by the heat of the smoke. Through the above structure, the shell 310 can be used to receive and discharge smoke. The set condensing heat exchanger 312 can further utilize the waste heat of the smoke for heat exchange. The bottom wall of the shell 310 can also cooperate with the cover 220 to limit its rotation angle.

[0039] Reference Figure 2 and Figure 5 In some embodiments of the present invention, when the cover 220 is in contact with the housing 310, the angle between the cover 220 and the horizontal plane is less than 20°. Specifically, when the cover 220 is at its maximum opening, the angle between the cover 220 and the horizontal plane is too large, which will cause the closing process of the cover 220 to be late, and the explosion venting hole 211 to be open for a long time. The maximum opening of the cover 220 can be set to an angle of 19 degrees with the horizontal plane, so that it can be quickly closed after the explosion venting, reducing the opening time of the explosion venting hole 211 and maintaining normal combustion of the burner.

[0040] It is understandable that the maximum opening of the cover body 220 can be set to an angle of 15 degrees with the horizontal plane, which can release the explosion pressure.

[0041] Reference Figure 1 In some embodiments of the present invention, there are multiple explosion relief assemblies 200 and multiple through holes 120 . Multiple explosion relief assemblies 200 are arranged at intervals in the negative pressure combustion chamber 100 , and the explosion relief holes 211 are connected to the corresponding through holes 120 .

[0042] Specifically, the explosion relief components 200 can be set to six, or more, and the specific number is not limited. The explosion relief components 200 can be arranged in a row at an interval at the upper end of the negative pressure combustion chamber 100, and the opened through holes 120 are set to the number corresponding to the explosion relief components 200. The pressure relief effect of multiple explosion relief components 200 is more ideal.

[0043] It is understandable that different numbers of explosion relief components 200 and through holes 120 can be provided according to user needs to meet the pressure relief requirements during deflagration.

[0044] Reference Figure 3 to Figure 4 In some embodiments of the present invention, the cover 220 is provided with a first pivoting portion 221 , and the base 210 is provided with a second pivoting portion 212 . The first pivoting portion 221 is pivotally connected to the second pivoting portion 212 , so that the cover 220 can rotate to open and close the explosion-venting hole 211 .

[0045] Specifically, the first pivot part 221 can be a pivot shaft, the second pivot part 212 can be a pivot sleeve, the pivot sleeve can be connected to the base 210 through a connecting piece, the pivot shaft can be set at the edge of the cover body 220, and the pivot shaft and the pivot sleeve are pivotally connected so that the cover body 220 can rotate to open and close the explosion-proof hole 211.

[0046] It is understandable that the specific pivoting structures of the first pivoting portion 221 and the second pivoting portion 212 are not limited as long as the cover 220 can be rotated to open and close the explosion-releasing hole 211 .

[0047] Reference Figure 3 to Figure 4 In some embodiments of the present invention, the base 210 is provided with an explosion relief pipe 213, the explosion relief hole 211 is set as a through hole 120 in the explosion relief pipe 213, and the cover 220 can cover the end of the explosion relief pipe 213 away from the base 210. The cover 220 can be fully closed.

[0048] Specifically, the explosion-proof tube 213 can be set to be shorter and thicker, which can improve its impact resistance. The base 210 can be a flange, and its caliber is consistent with the caliber of the explosion-proof tube 213. The explosion-proof tube 213 can be welded to the base 210, and its through hole 120 is the explosion-proof hole 211. The cover body 220 cooperates with the end of the explosion-proof tube 213. The size of the cover body 220 can be larger than the caliber of the explosion-proof tube 213, and the cover body 220 can fully close the explosion-proof tube 213.

[0049] Reference Figure 3 to Figure 4 In some embodiments of the present invention, the cover 220 is provided with an annular groove 222, and the annular groove 222 can cooperate with the end of the explosion relief pipe 213, so that the cover 220 can further fully close the explosion relief hole 211.

[0050] Specifically, the cover body 220 can be circular, and an annular groove 222 can be punched out of the cover body 220. The diameter of the annular groove 222 is roughly the same as the diameter of the explosion-proof tube 213. The tube wall at the end of the explosion-proof tube 213 can be inserted into the annular groove 222, so that the cover body 220 can further close the explosion-proof hole 211 fully.

[0051] Reference Figure 3 to Figure 4 In some embodiments of the present invention, the cover 220 is spherical. Specifically, the cover 220 may be spherical, with its center close to one side of the explosion vent 211. The spherical cover 220 is similar to an arch structure, which can effectively disperse the impact force of the explosion and reduce the occurrence of impact damage or deformation of the cover 220.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A boiler explosion relief device, characterized in that: include: A negative pressure combustion chamber (100) comprises a first cavity (110) and a through hole (120), wherein the through hole (120) is in communication with the first cavity (110); An explosion relief assembly (200) comprises a base (210) and a cover (220), wherein the base (210) is disposed in the negative pressure combustion chamber (100), the base (210) is provided with an explosion relief hole (211) communicating with the through hole (120), the cover (220) is pivotally connected to the base (210), and the cover (220) can rotate under the action of gravity to cover the explosion relief hole (211); A limiting device (300) is provided in the negative pressure combustion chamber (100), and the limiting device (300) can abut against the cover body (220) to limit its maximum angle relative to the horizontal plane to less than 90°.

2. A boiler explosion relief device according to claim 1, characterized in that: The through hole (120) and the base (210) are both arranged above the negative pressure combustion chamber (100).

3. A boiler explosion relief device according to claim 2, characterized in that: The limiting device (300) comprises a shell (310), wherein the shell (310) is arranged above the negative pressure combustion chamber (100), and a gap exists between a part of the bottom surface of the shell (310) and the top of the negative pressure combustion chamber (100), and the cover (220) is located at the gap.

4. A boiler explosion relief device according to claim 3, characterized in that: The shell (310) has a second cavity (311), the second cavity (311) is connected to the first cavity (110), the shell (310) is capable of receiving combustion flue gas, and a condensing heat exchanger (312) is provided in the second cavity (311), and the condensing heat exchanger (312) is used to absorb residual heat of the combustion flue gas.

5. A boiler explosion relief device according to claim 3, characterized in that: When the cover body (220) is in contact with the shell (310), the angle between the cover body (220) and the horizontal plane is less than 20°.

6. A boiler explosion relief device according to claim 5, characterized in that: The explosion relief components (200) are provided in a plurality, the through holes (120) are provided in a plurality, the plurality of explosion relief components (200) are arranged at intervals in the negative pressure combustion chamber (100), and the explosion relief holes (211) are in communication with the corresponding through holes (120).

7. A boiler explosion relief device according to claim 1, characterized in that: The cover (220) is provided with a first pivoting portion (221), and the base (210) is provided with a second pivoting portion (212), and the first pivoting portion (221) is pivotally connected to the second pivoting portion (212).

8. A boiler explosion relief device according to claim 7, characterized in that: The base (210) is provided with an explosion relief pipe (213), the explosion relief hole (211) is configured as a through hole (120) in the explosion relief pipe (213), and the cover body (220) can cover the end of the explosion relief pipe (213) away from the base (210).

9. A boiler explosion relief device according to claim 8, characterized in that: The cover body (220) is provided with an annular groove (222), and the annular groove (222) can cooperate with the end of the explosion relief pipe (213).

10. A boiler explosion relief device according to claim 9, characterized in that: The cover body (220) is spherical.

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