GB2586253A

GB2586253A - Chimney with explosion-proof cover structure and gas fireplace having the same

Info

Publication number: GB2586253A
Application number: GB1911637.5A
Authority: GB
Inventors: Zhou Yin
Original assignee: Ningbo Richen Electrical Appliance Co Ltd
Current assignee: Ningbo Richen Electrical Appliance Co Ltd
Priority date: 2019-05-09
Filing date: 2019-08-14
Publication date: 2021-02-17
Anticipated expiration: 2039-08-14
Also published as: GB201911637D0; GB2586253B

Abstract

A chimney or flue 1 has a pressure relief port 13 that includes an explosion-proof cover 2 installed to the exterior of the relief port. The cover can move between an open and closed position, and when closed seals the relief port and is held in place by a tensioning force, such as a spring (32 fig 2) or a gravity block (21 fig 13). The cover can include a hinge (3 fig 2) and opens in an outwardly direction such that if an explosion occurs, the cover will open to relieve the pressure from the explosion. The arrangement can be used on a gas fuelled fireplace 4 with an associated flue, and the flue may permit supply of combustion air from the outside via an intake port 14 to the fireplace and discharge of exhaust gases via an exhaust port 15. In the event of an explosion of gas fuel in the gas fireplace or the flue, the relief port and cover allow pressure to be relieved and prevent damage or injury.

Description

CHIMNEY WITH EXPLOSION-PROOF COVER STRUCTURE

AND GAS FIREPLACE HAVING THE SAME

FIELD OF INVENTION

[0001] The present invention relates to the field of gas fireplaces, in particular to a chimney with an explosion-proof structure and a gas fireplace having the chimney.

BACKGROUND OF INVENTION 1. Description of the Related Art [0002] Gas fireplace is a heating device that consumes clean energy. Since the gas fireplace not just provides sufficient heating only, but also provides real flames for viewing (compared with heaters such as wall mounted boilers without any enjoyable visual effect) and gives both heating and decorating effects, therefore the gas fireplace is loved by consumers extensively. In general, the conventional gas fireplace is divided into an opened gas fireplace and a balanced gas fireplace according to the intake and exhaust structure, and the so-called balanced gas fireplace refers to a gas fireplace having a furnace chamber with a closed internal cavity, and a combustion air is entered from an outdoor environment and an exhaust gas is also discharged to the outdoor environment, so that the gas fireplace does not use any indoor air during its operation and lowers the requirements of the using place, wherein the using place does not need to change air. Doors and windows of the using place can be closed to achieve the effects of keeping warm and providing better user experience. In addition, the chimney used for the balanced gas fireplace is generally a two-layer chimney, wherein the outer-layer chimney is provided for entering the combustion air and the inner-layer chimney is provided for discharging the exhaust gas, or two independent chimneys are provided for entering the combustion air and discharging the exhaust gas respectively.

[0003]After a breakdown and/or an improper operation of the gas fireplace, a large amount of combustible gas may be accumulated in the fireplace cavity, and an explosion may be caused by an ignition in the abovementioned situation. To prevent a large amount of backflovv from entering into a smoke outlet of the chimney, the size of the opening of the smoke outlet must be small, so that the high-pressure discharge gas produced by the explosion cannot be discharged timely, and the glass of the fireplace may be broken, or the whole fireplace may even be torn apart. Therefore, the balanced gas fireplace needs an explosion-to proof structure to serve as a pressure relief port during an explosion and relieve the instantaneous high pressure produced by the explosion.

[00041 In general, the explosion-proof structure of the conventional balanced gas fireplace is built on the main body of the fireplace. For example, a pressure relief port is formed at the top or on a side of the furnace chamber, and a cover with a certain pre-stress is used for sealing the internal cavity. To provide a reliable pressure relief, the pre-stress cannot be too large, since a too-large prestress prevents the pressure relief port to be sealed reliably. During an operation, the exhaust gas produced by the fuel combustion may be leaked to the indoor environment and thus posing a threat to the personal safety of users. In the meantime, flames may be ejected from the pressure relief port during the explosion to burn and injure the user or ignite nearby combustibles to cause a fire.

2. Summary of the Invention

[0005] Technical Problems to be Solved [000o]It is a primary objective of the present invention to overcome the aforementioned drawbacks of the conventional gas fireplace by providing a chimney with an explosion-proof structure, and a gas fireplace having the chimney. In the structure of the present invention used in a balanced gas fireplace, the pressure relief port formed on the top of a side of the chamber cavity of the furnace chamber of the gas fireplace can be omitted, so that the chamber cavity of the furnace chamber has a good sealing effect, while preventing a possible explosion from posing a threat to the personal safety of the users, and such chimney is applicable for most balanced gas fireplaces, especially for the balanced gas fireplace with a short chimney [0007]Technical Solution [0008] To achieve the aforementioned and other objectives, the present invention provides a chimney structure with an explosion-proof structure comprising the chimney and an explosion-proof cover, and the chimney comprises an exhaust port, an intake port and a pressure relief port, and the explosion-proof cover is installed to the exterior of the pressure relief port and capable of opening in a direction towards the outside under the effect of a certain external force, and the explosion-proof cover is capable of sealing the pressure relief port under the effect of a certain pre-tension force, and the pressure relief port has an opening area greater than that of the intake port.

[0009]Further, the chimney is divided into inner and outer chimneys which are an intake chimney and an exhaust chimney, and the pressure relief port is configured to be facing the exhaust chimney, or the chimney is divided into two independent chimneys which are an intake chimney and an exhaust chimney, and the pressure relief port is formed on the exhaust chimney. In other words, the pressure relief port may be disposed on a two-layer chimney or a single-layer chimney The intake chimney and the intake port communicate to each other, and the exhaust chimney and the exhaust port communicate to each other.

[0010]Further, the explosion-proof cover is installed to the chimney through a hinge, and the explosion-proof cover has a torsion spring installed thereto, and the torsion spring is provided for sealing the pressure relief port by the explosion-proof cover by a pre-tension force.

[00111 Further, the chimney has a plurality of guide rods, and the guide rod has a compression spring, and the explosion-proof cover provides a pre-tension force by the compression spring to seal the pressure relief port by the explosion-proof cover.

[00121Further, the explosion-proof cover has a gravity block, and the explosion-proof cover seals the pressure relief port under the effect of the gravity block.

[00131Further, the chimney has a total length of 0.3m-5m in order to relieve the high-pressure gas produced by an explosion timely.

[00141On the other hand, the present invention further provides a gas fireplace having the chimney. The present invention overcomes the technical problems of the prior art by providing the gas fireplace comprising a furnace chamber, and the furnace chamber has a cavity formed therein, and the furnace chamber further has an exhaust interface and an intake interface, and the internal cavity of the furnace chamber other than the exhaust interface and the intake interface is completely sealed and isolated from the external space.

[00151The exhaust interface of the furnace chamber is coupled to the exhaust chimney, and the intake interface of the furnace chamber is coupled to the intake chimney [00161In a nonnal operation of the gas fireplace, the explosion-proof cover covers the pressure relief port completely under the effect of a certain pre-tension force, and a combustion air is entered from the intake port of the chimney and passed through the intake chimney and the intake interface into the furnace chamber to carry out the combustion of fuel, and an exhaust gas is produced after the combustion and passed through the exhaust interface and the exhaust chimney to discharge from the exhaust port, and the internal cavity of the furnace chamber is completely isolated from the external space, and no gas exchange takes place between the internal and external environments of the furnace chamber.

[0017] If a large amount of combustible gas is accumulated in the internal cavity of the furnace chamber of the gas fireplace and an ignition operation is carried out, an explosion will occur, and the internal pressure of the furnace chamber will increase instantaneously. Now, pressure may pass through the exhaust chimney and reach the exhaust port and the pressure relief port. Since the size of the exhaust port size is not large enough to relieve the pressure produced by the explosion, the pressure will be acted onto the explosion-proof cover. The impact force produced by the explosion is much greater than a pre-tension force that seals the pressure relief port by the explosion-proof cover, so that the high-gas produced by the explosion pushes away the explosion-proof cover, and the pressure in the furnace chamber is relieved through the pressure relief port to prevent the high pressure produced in the explosion from posing a threat to the damage of the product and the personal safety of the users.

[0018]Further, the furnace chamber has an auxiliary pressure relief port formed IS at the bottom thereof. Since the pressure relief port is configured to be facing the exhaust chimney and combustible gas accumulated in the furnace chamber may exist at the bottom of the furnace chamber, the path from the bottom of the furnace chamber to the pressure relief port is long. Now, the auxiliary pressure relief port at the bottom of the furnace chamber is provided for assisting the pressure relief during an explosion.

[0019]Beneficial Effects [0020]Compared with the prior art, the present invention has the following advantages: [0021]In the chimney with an explosion-proof structure of the present invention, the explosion-proof structure is installed onto the chimney, and the explosion-proof structure is no longer needed to be installed at the top or a side of the cavity of the furnace chamber of the balanced gas fireplace. Such arrangement not just prevents damaging the product or injuring the user during an explosion only, but also isolates the cavity of the furnace chamber cavity from the indoor environment where the balanced gas fireplace is situated. The present invention can prevent a leakage caused by the poor sealing effect of the pressure relief port and a change of air around the using environment. in other words, the combustion air is entered from the outdoor environment, and the exhaust gas is discharged to the outdoor environment

BRIEF DESCRIPTION OF THE DRAWINGS

[0022]FIG. 1 is a perspective view of a chimney in accordance with a first embodiment of the present invention; [0023] FIG. 2 is a partial blowup view of Section A of the chimney in accordance with the first embodiment of the present invention; [0024] FIG. 3 is a half section view of the chimney in accordance with the first embodiment of the present invention; [0025]FIG. 4 is a perspective view of the chimney in accordance with the first embodiment of the present invention during an explosion; [0026] FIG. 5 is a half section view of the chimney in accordance with the first embodiment of the present invention during an explosion; [0027]FIG. 6 is a perspective view of a gas fireplace in accordance with a second embodiment of the present invention; [0028] FIG. 7 is a half section view of the gas fireplace in accordance with the second embodiment of the present invention; [0029]FIG. 8 is a perspective view of the gas fireplace in accordance with the second embodiment of the present invention during explosion; [00301FIG. 9 is a half section view of the gas fireplace in accordance with the second embodiment of the present invention during explosion; [00311FIG. 10 is a perspective view of a chimney in accordance with a third embodiment of the present invention; [00321F1G. 11 is a half section view of the chimney in accordance with the third embodiment of the present invention during explosion; [00331FIG. 12 is a partial blowup view of Section B of the chimney in accordance with the third embodiment of the present invention; [00341F1G. 13 is a perspective view of a chimney in accordance with a fourth embodiment of the present invention; [00351FIG. 14 is a half section view of the chimney in accordance with the fourth embodiment of the present invention; [00361FIG. 15 is a perspective view of the chimney in accordance with the fourth embodiment of the present invention during explosion; [00371FIG. 16 is a perspective view of a chimney in accordance with a fifth embodiment of the present invention; [00381FIG. 17 is a partial blowup view of Section C of the chimney in accordance with the fifth embodiment of the present invention; [00391FIG. 18 is a half section view of the chimney in accordance with the fifth embodiment of the present invention; [00401FIG. 19 is a half section view of the chimney in accordance with the fifth embodiment of the present invention during explosion; [00411FIG. 20 is a schematic view of a gas fireplace in accordance with a sixth embodiment of the present invention; [00421F1G. 21 is a partial blowup view of Section D of the gas fireplace in accordance with the sixth embodiment of the present invention; [00431FIG. 22 is a half section view of the gas fireplace in accordance with the sixth embodiment of the present invention; [0044] FIG. 23 is a perspective view of the gas fireplace in accordance with the sixth embodiment of the present invention during explosion; and [0045] FIG. 24 is a half section view of the gas fireplace in accordance with the sixth embodiment of the present invention.

[0046]Brief Description of Numerals in the Drawings: 1-chimney; 2-explosionproof cover; 3-hinge; 4-gas fireplace; 5-guide rod; 11-intake chimney; 12-exhaust chimney; 13-pressure relief port; 14-intake port; 15-exhaust port; 16-tenninal cover; 21-gravity block; 31-rotary axis; 32-torsion spring; 41-furnace chamber; 42-exhaust interface; 43-intake interface; 44-auxiliary pressure relief port; 45-auxiliary explosion-proof cover; and 51-compression spring.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0047] To make it easier for our examiner to understand the objective of the invention, its structure, innovative features, and performance, we use a preferred embodiment together with the attached drawings for the detailed description of the invention.

[00481Embodiment 1 (Chimney) [0049]With reference to FIGS. 1 to 4 for a chimney with an explosion-proof structure in accordance with the first embodiment of the present invention, this embodiment comprises a chimney 1 and an explosion-proof cover 2, and the chimney 1 is a two-layer chimney divided into an outer-layer intake chimney 11 and an inner-layer exhaust chimney 12, and both of the intake chimney 11 and exhaust chimney 12 are configured to be eccentric. In this embodiment 1, the chimney 1 has a length of 0.8m, and the chimney 1 includes a pressure relief port 13 formed thereon and configured to be facing the exhaust chimney 12, and the explosion-proof cover 2 is installed to the exterior of the pressure relief port 13.

In addition, a hinge 3 is installed between the chimney 1 and the explosion-proof cover 2, and the hinge 3 has a rotary axis 31, and the explosion-proof cover 2 can be rotated around the rotary axis 31 of the hinge 3, and the hinge 3 further has a torsion spring 32 with a certain pre-tension force to drive the explosion-proof cover 2 to seal the pressure relief port 13. Further, the chimney 1 has an intake port 14 and an exhaust port 15, wherein the intake port 14 and the intake chimney 11 communicate to each other, and the exhaust port 15 and the exhaust chimney 12 communicate to each other.

[00501During a normal operation as shown in FIGS. 1 to 3, the explosion-proof cover 2 covers the pressure relief port 13 completely under the effect of the pretension force of the torsion spring 32, and the combustion air is entered from the intake port 14, and the exhaust gas discharged from the exhaust port 15 after combustion is further discharged to the outside from the exhaust chimney 12.

[0051]During an explosion as shown in FIGS. 4 and 5, if the impact force produced by the explosion is much greater than the pre-tension force of the torsion spring 32, then the high-pressure gas produced by the explosion will push to open the explosion-proof cover 2, so that the explosion-proof cover 2 is opened spontaneously, and the pressure relief port 13 is provided for relieving the pressure of the high-pressure gas in the furnace chamber of the gas fireplace.

[0052] Embodiment 2 (Gas Fireplace) [0053] With reference to FIGS. 6 to 9 for a gas fireplace 4 in accordance with the second embodiment of the present invention, the gas fireplace 4 comprises the chimney with the explosion-proof structure of the first embodiment, and further comprises a furnace chamber 41 with a cavity formed therein, and the furnace chamber further has an exhaust interface 42 and an intake interface 43, and the exhaust interface 42 is coupled to the exhaust chimney 12, and the intake interface 43 is coupled to the intake chimney 11, and the internal cavity of the furnace chamber 41 other than the exhaust interface 42 and the intake interface 43 is completely sealed and isolated from the outside.

[0054]In addition, an auxiliary pressure relief port 44 is formed at the bottom of the furnace chamber 41, and an auxiliary explosion-proof cover 45 is installed to the exterior of the auxiliary pressure relief port 44, and the auxiliary explosion-proof cover 45 seals the auxiliary pressure relief port 44 under the effect of the pre-tension force.

[00551 In a normal operation of the gas fireplace 4 as shown in FIGS. 6 and 7, the explosion-proof cover 2 covers the pressure relief port 13 completely under the effect of the pre-tension force of the torsion spring 32, and a combustion air is entered into the intake port 14 of the intake chimney 11, and passed through the intake interface 43 into the furnace chamber 41 to carry out the fuel combustion, and the exhaust gas produced after the combustion is passed through the exhaust interface 42 into the exhaust chimney 12, and then discharged from the exhaust chimney 12 and the exhaust port 15, and the internal cavity of the gas fireplace 4 is isolated completely from the external environment, and no gas exchange takes place between the internal and external environments of the furnace chamber.

[00561 In FIGS. 8 and 9, if a large amount of combustible gas is accumulated in the internal cavity of the furnace chamber 41 of the gas fireplace 4, and an ignition operation is carried out, then the combustible gas in the furnace chamber 41 of the gas fireplace 4 will be ignited spontaneously, and the explosion will occur, and the internal pressure of the furnace chamber 41 will increase spontaneously. Now, the pressure may reach the exhaust port 15 and the pressure relief port 13 through the exhaust chimney 12. Since the size of the exhaust port 15 is not large enough to relieve the pressure produced by the explosion, the pressure is acted onto the explosion-proof cover 2. If the impact force produced by the explosion is much greater than the pre-tension force of the torsion spring 32, then the high-pressure gas produced by the explosion will push to open the explosion-proof cover 2, and the pressure in the furnace chamber 41 will be relieved through the pressure relief port 13. In addition, the distance from the bottom of the furnace chamber 41 to the pressure relief port 13 is relatively longer, so that the pressure at the bottom of the furnace chamber 41 can be relieved through the auxiliary pressure relief port 44 timely to prevent the high pressure produced by the explosion from posing a substantial threat to the personal safety of the users.

[00571 Embodiment 3 (Chimney) [00581With reference to FIGS. 10 to 12 for a chimney with an explosion-proof structure in accordance with the third embodiment of the present invention, this embodiment comprises a chimney 1 and an explosion-proof cover 2, and the chimney 1 is a two-layer chimney which is divided into an outer-layer intake chimney 11 and an inner-layer exhaust chimney 12, and the intake chimney 11 and the exhaust chimney 12 are configured to be eccentric. In this embodiment 3, the chimney 1 has a length of 0.8m, and the chimney 1 has a pressure relief port 13 formed thereon and configured to be facing the exhaust chimney 12, and the explosion-proof cover 2 is installed to the exterior of the pressure relief port 13, and a guide rod is installed to the exterior of the explosion-proof cover 2, and the guide rod 5 has a compression spring 51 installed thereto, and the compression spring 51 has a certain pre-tension force acted onto the explosion-proof cover 2 to drive the explosion-proof cover 2 to seal the pressure relief port 13. The explosion-proof cover 2 can be moved outwardly along the guide rod 5 under the effect of a certain external force. The chimney 1 further comprises an intake port 14 and an exhaust port 15, wherein the intake port 14 and the exhaust port 15 communicate to each other, and the exhaust port 15 and the exhaust chimney 12 communicate to each other.

[0059]During an explosion, if the impact force produced by the explosion is much greater than the pre-tension force of the compression spring 51, then the high-pressure gas produced by the explosion will push to open the explosion-proof cover 2, so that the explosion-proof cover 2 is opened spontaneously, and the pressure relief port 13 is provided for relieving the pressure of the high-pressure gas in the furnace chamber 41.

[0060] Embodiment 4 (Chimney) [0061] With reference to FIGS. 13 to 15 for a chimney with an explosion-proof structure in accordance with the fourth embodiment of the present invention, this embodiment comprises a chimney 1 and an explosion-proof cover 2, wherein the chimney 1 is a two-layer chimney divided into an outer-layer intake chimney 11 and an inner-layer exhaust chimney 12, and the intake chimney 11 and the exhaust chimney 12 are configured to be eccentric. In this embodiment 4, the chimney 1 has a length of 0.8m, and the chimney 1 has a pressure relief port 13 formed thereon and configured to be facing the exhaust chimney 12, and the to explosion-proof cover 2 is installed to the exterior of the pressure relief port 13.

In addition, a hinge 3 is installed between the chimney 1 and the explosion-proof cover 2 for connection, and the hinge 3 has a rotary axis 31 thereon, and the explosion-proof cover 2 can be rotated around the rotary axis 31 of the hinge 3 and opened, and the explosion-proof cover 2 has a gravity block 21 disposed thereon, and the explosion-proof cover 2 has a tendency to turn over under the effect of the gravity block 21, so as to provide a pre-tension force to drive the explosion-proof cover 2 to seal the pressure relief port 13. The chimney 1 further has an intake port 14 and an exhaust port 15, and the intake port 14 is communicated to the intake chimney 11, and the exhaust port 15 is communicated to the exhaust chimney 12.

[0062]During an explosion, if the impact force produced by the explosion is much greater than the pre-tension force of the explosion-proof cover 2 produced by the gravity of the gravity block 21, then the high-pressure gas produced by the explosion will push to open the explosion-proof cover 2, so that the explosion-proof cover 2 is opened spontaneously, and the pressure relief port 13 is provided for relieving the pressure of the high-pressure gas in the furnace chamber 41.

[0063]Embodiment 5 (Chimney) [0064] With reference to FIGS. 15 to 19 for a chimney with an explosion-proof structure in accordance with the fifth embodiment of the present invention, this embodiment comprises a chimney 1 and an explosion-proof cover 2, and the chimney I is a two-layer chimney divided into an outer-layer intake chimney 11 and an inner-layer exhaust chimney 12, wherein the intake chimney 11 and the exhaust chimney 12 are configured to be eccentric. In this embodiment 5, the chimney further comprises a terminal cover 16, and the chimney 1 has a length of 0.8m, and the terminal cover 16 of the chimney 1 has a pressure relief port 13 formed thereon, and the pressure relief port 13 is configured to be facing the exhaust chimney 12, and the explosion-proof cover 2 is installed to the exterior of the pressure relief port 13. In addition, a hinge 3 is installed between the terminal cover 16 and the explosion-proof cover 2 and provided for connection, and the hinge 3 has a rotary axis 31 thereon, and the explosion-proof cover 2 can be rotated around the rotary axis 31 of the hinge 3 and opened outwardly under is the effect of the external force, and the hinge 3 has a torsion spring 32 installed thereto, and the torsion spring 32 has a certain pre-tension force to drive the explosion-proof cover 2 to seal the pressure relief port 13. The terminal cover 16 has an intake port 14 and an exhaust port 15 formed thereon, and the intake port 14 and the intake chimney 11 communicate to each other, and the exhaust port 15 and the exhaust chimney 12 communicate to each other.

[0065]During an explosion, if the impact force produced by the explosion is much greater than the pre-tension force of the torsion spring 32, the high-pressure gas produced by the explosion will push to open the explosion-proof cover 2, so that the explosion-proof cover 2is opened spontaneously, and the pressure relief port 13 is provided for relieving the pressure of the high-pressure gas in the furnace chamber 41.

[0066]Embodiment 6 (Gas Fireplace) [0067] With reference to FIGS. 20 to 24 for a gas fireplace 4 in accordance with the sixth embodiment of the present invention, this embodiment comprises a chimney 1 and an explosion-proof cover 2, and the chimney 1 includes two independent chimneys which are an intake chimney 11 and an exhaust chimney 12. In this embodiment, both of the intake chimney 11 and the exhaust chimney 12 have a length approximately equal to 0.8m, and the exhaust chimney 12 has a pressure relief port 13 formed thereon, and a pressure relief port 13 configured to be facing the exhaust chimney 12, and the explosion-proof cover 2 is installed to the exterior of the pressure relief port 13, and a hinge 3 is installed between the exhaust chimney 12 and the explosion-proof cover 2 and provided for connection, and the hinge 3 has a rotary axis 31 thereon, and the explosion-proof cover 2 can be rotated around the rotary axis 31 of the hinge 3 and opened outwardly under the effect of the external force, and the hinge 3 has a torsion spring 32 installed thereto, and the torsion spring 32 has a certain pre-tension force to drive the explosion-proof cover 2 to seal the pressure relief port 13 In addition, there are an intake port 14 and an exhaust port 15, and the intake port is 14 and the intake chimney 11 communicate to each other, and the exhaust port and the exhaust chimney 12 communicate to each other.

[00681The gas fireplace 4 further comprises a furnace chamber 41, and the furnace chamber 41 has a closed cavity fonned therein, and the furnace chamber 41 further has an exhaust interface 42 and an intake interface 43, and the exhaust interface 42 is coupled to the exhaust chimney 12, and the intake interface 43 is coupled to the intake chimney 11, and the internal cavity of the furnace chamber 41 other than the exhaust interface 42 and the intake interface 43 is sealed and isolated completely from the outside. In addition, an auxiliary pressure relief port 44 is formed at the bottom of the furnace chamber 41 and an auxiliary explosion-proof cover 45 is installed to the exterior of the auxiliary pressure relief port 44, and the auxiliary explosion-proof cover 45 seals the auxiliary pressure relief port 44 under the effect of a certain pre-tension force.

[0069] In a normal operation of the gas fireplace 4 as shown in FIGS. 20 to 22, the explosion-proof cover 2 covers the pressure relief port 13 completely under the effect of the pre-tension force of the torsion spring 32, and a combustion air is entered from the intake port 14, and then passed through the intake interface 43 into the furnace chamber 41 to carry out a fuel combustion, and the exhaust gas produced after the combustion is passed through the exhaust interface 42 into the exhaust chimney 12, and then discharged from the exhaust chimney 12 and the exhaust port 15, and the internal cavity of the furnace chamber 41 is isolated completely from the indoor environment, and no gas exchange takes place between the internal and external environments of the furnace chamber.

[0070] In FIGS. 22 and 23, if a large quantity of combustible gas is accumulated in the internal cavity of the furnace chamber 41 and an ignition operation is carried out, then the combustible gas in the furnace chamber 41 will be ignited spontaneously, and an explosion will occur, and the internal pressure of the furnace chamber 41 will increase spontaneously. Now, the pressure can pass through the exhaust chimney 12 to reach the exhaust port 15 and the pressure relief port 13. Since the size of the exhaust port 15 is not large enough to relieve the pressure produced by the explosion, the pressure is acted onto the explosion-proof cover 2. If the impact force produced by the explosion is much greater than the pre-tension force of the torsion spring 32, then the high-pressure gas produced by the explosion will push to open the explosion-proof cover 2, and the pressure in the furnace chamber 41 will be relieved through the pressure relief port 13. Since the distance from the bottom of the furnace chamber 41 to the pressure relief port 13 is relatively longer, therefore the pressure at the bottom of the furnace chamber 41 can be relieved timely from the auxiliary pressure relief port 44, so as to prevent the high pressure produced by the explosion from posing a substantial threat to the personal safety of the users.

[0071]While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.

Claims

What is claimed is: A chimney with an explosion-proof structure, comprising a chimney (1) and an explosion-proof cover (2), characterized in that the chimney (1) has a pressure relief port (13) formed thereon, and the explosion-proof cover (2) is installed to the exterior of the pressure relief port (13) for sealing the pressure relief port (13); the explosion-proof cover (2) seals the pressure relief port (13) by a pre-tension force; the explosion-proof cover (2) overcomes the pretension force under the effect of a certain force and opens in a direction towards the outside of the pressure relief port (13).
2. The chimney with an explosion-proof structure according to claim 1, wherein the chimney (1) comes with a quantity of two, and the two chimneys (1) include an intake chimney (11) and an exhaust chimney (12), and a spatial structure between the intake chimney (11), and the exhaust chimney (12) is a two-layer distribution structure, and the pressure relief port (13) is aligned with an exhaust channel of the exhaust chimney (12).
3. The chimney with an explosion-proof structure according to claim 1, wherein the chimney (1) comes with a quantity of two, and the two chimneys (1) include an intake chimney (11) and an exhaust chimney (12), and a spatial distribution structure between the intake chimney (11) and the exhaust chimney (12) is an independent distribution structure, and the pressure relief port (13) is disposed on the exhaust chimney (12).
4. The chimney with an explosion-proof structure according to claim 2 or 3, wherein the exhaust chimney (12) has an exhaust port (15) disposed thereon, and the exhaust port (15) and the exhaust chimney (12) communicate to each other, and the pressure relief port (13) has an opening area greater than the opening area of the exhaust port (15).
5. The chimney with an explosion-proof structure according to claim 1, wherein the chimney (1) has a plurality of guide rods (5), and a compression spring (51) is installed to the guide rods (5), and the explosion-proof cover (2) provides a pre-tension force through the compression spring (51) to seal the pressure relief port (13) by the explosion-proof cover (2).
6. The chimney with an explosion-proof structure according to claim 1, wherein the explosion-proof cover (2) has a gravity block (21) disposed thereon, and the pre-tension force is provided by the gravity of the gravity block (21), so that the explosion-proof cover (2) seals the pressure relief port (13) under the effect of the gravity block (21).
7. The chimney with an explosion-proof structure according to claim 1, wherein the explosion-proof cover (2) is installed onto the chimney (1) through a hinge (3), and the hinge (3) has a torsion spring (32) installed thereto, and the torsion spring (32) is provided for sealing the pressure relief port (13) by the explosion-proof cover (2) by a pre-tension force.
8. A gas fireplace, comprising the chimney with an explosion-proof structure according to any one of claims 2 to 7.
9. The gas fireplace according to claim 8, further comprising a furnace chamber (41), and the furnace chamber (41) having an exhaust interface (42) and an intake interface (43), and the exhaust interface (42) and the exhaust chimney (12) being coupled to each other, and the intake interface (43) and the intake interface (11) being coupled to each other, and an internal cavity of the furnace chamber (41) other than the exhaust interface (42) and the intake interface (43) being isolated from the external space.The gas fireplace according to claim 9, wherein the furnace chamber (41) has an auxiliary pressure relief port (44) disposed at the bottom thereof, and an auxiliary explosion-proof cover (45) disposed outside the auxiliary pressure relief port (44).