AU2016293230B2

AU2016293230B2 - Portable explosion-proof gas stove

Info

Publication number: AU2016293230B2
Application number: AU2016293230A
Authority: AU
Inventors: Hae Goog Chung
Original assignee: MAXSUN DALIAN CO Ltd
Current assignee: Maxsun (dalian) Co Ltd
Priority date: 2015-07-15
Filing date: 2016-06-29
Publication date: 2020-07-09
Anticipated expiration: 2036-06-29
Also published as: AU2016293230C1; AU2020250316B2; AU2019100690A4; AU2019101377A4; CN204880256U; WO2017008636A1; AU2019100690B4; AU2017101755A4; AU2017101755B4; AU2019101377B4; AU2016293230A1; AU2020250316A1; WO2017008363A1

Abstract

A portable explosion-proof gas stove, comprising a stove shell, a combustion head (2), an ignition apparatus, a gas tank bearing part, and a heat insulating and cooling apparatus, the combustion head (2) being arranged in the stove shall, the ignition apparatus and the combustion head (2) being connected, the gas tank bearing part and the stove shell being connected, the insulating and cooling apparatus being positioned on the stove shell, the present stove also comprising a gas tank cover and a wind-shielding screen (6), an elongated heat dissipation opening (18) and a gas tank cover heat dissipating hole (23) being arranged on the gas tank cover (20). The present stove has good heat insulating and heat dissipating effects; heating is safer.

Description

A PORTABLE EXPLOSION-RESISTANT GAS STOVE TECHNICAL FIELD

[0001] The present invention relates to gas stoves and more particularly refers to a portable explosion-resistant gas stove.

BACKGROUND OF THE INVENTION

[0002] Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.

[0003] In the prior art ordinary gas stoves are used for cooking or baking with trays, flame zones of their burners and the trays will overheat because distance between their burners and gas cartridges is too short and outer diameter of their wind-shield ring is too small. The heat transfers to gas cartridges through casings and gas cartridge compartment lids and overheats gas cartridges consequently, which will trigger safety device to unlock the gas cartridges. Although gas cartridges are unlocked, they, overheated by heat from flame zones and baking trays, still have the possibility of explosion, which is extremely dangerous.

[0004] ZL201420766905.5 discloses a portable gas stove which comprises a top panel, a burner, a knob, pan supports, a wind-shield ring, a bottom panel, a separating plate, a back panel, a front panel, a gas cartridge, a regulator, a temperature sensor, an ignition needle, a thermal conductive plate and a fluid holder. Said burner is mounted on the bottom panel; said pan supports and wind-shield ring are disposed on the fluid holder; said fluid holder is installed on the top panel; said gas cartridge is connected to the regulator; said separating plate is attached to the top; front and back panels; said regulator is fixed on the separating plate; said knob is installed on the regulator; there are heat dissipation holes on both top and back panels; said ignition needle is positioned beneath the burner; said temperature sensor is disposed on the bottom panel and said thermal conductive plate is connected to the burner. However, ZL201420766905.5 does not disclose the shortest distance between said burner and ignition means, so it is impossible to guarantee that gas stoves manufactured in accordance with it have the lowest cost. In addition, although there are heat dissipation holes on gas cartridge compartment lid according to ZL201420766905.5, there is no detailed description about their size, shape, location and heat dissipation performance. By reference to attached drawings, heat dissipation holes will have poor performance if they are disposed in the side wall of the gas cartridge compartment lid. In addition, ZL201420766905.5 does not disclose any structure or method of any thermal insulation and/or cooling elements other than the heat dissipation holes. In conclusion, the gas stove disclosed by ZL201420766905.5 cannot save cost for manufacturers or dissipate heat effectively.

[0005] Pursuant to new EU standard, temperature of the gas cartridge shall not exceed 500C after a gas stove is used for 90 minutes. Therefore, it is very important to design a gas stove, a portable gas stove with lower manufacturing cost and better thermal insulation and/or heat dissipation effects which meet this new international standard.

DESCRIPTION OF THE INVENTION

[0006] It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative. An object of the present invention in at least one embodiment is to provide a portable explosion-resistant gas stove which is safer and has better thermal insulation and/or heat dissipation effects and can be used outdoor, especially at places like beaches.

[0007] Accordingly, one aspect of the present invention provides a portable explosion resistant gas stove comprising a casing, a burner, an ignition means, a gas cartridge compartment for receiving a gas cartridge that supplies gas to the burner, and one or more cooling elements. The burner is mounted inside the casing and connected to the ignition means; the gas cartridge compartment is attached to the casing and at least one cooling element is disposed on a top panel of the casing. A horizontal distance between a centre of the burner and a centre of gas cartridge compartment is 179mm or above.

[0008] In some embodiments, the at least one cooling element is formed in the top panel of the casing between the burner and the gas cartridge compartment. In other embodiments, the one or more cooling elements are disposed on at least one side panel of the casing.

[0009] Preferably, the one or more cooling elements comprise heat dissipation openings. More preferably, said heat dissipation openings are in the shape of holes or gratings. In some embodiments, the heat dissipation openings are elongate and are disposed through a side wall of said cartridge compartment lid to allow upward air flow.

[0010] Preferably, the portable explosion-resistant gas stove comprises a gas cartridge compartment lid which covers outside the gas cartridge holder. More preferably, the one or more cooling elements are disposed on the gas cartridge compartment lid. In some embodiments, wherein one or more thermal insulation stickers are disposed on an underside surface of the top of the gas cartridge compartment lid.

[0011] Preferably, a vertical distance between a top of the burner and the centre of the gas cartridge compartment is at least 54mm.

[0012] Preferably, the portable explosion-resistant gas stove further comprises one or more pan supports, wherein the height of the one or more pan supports is at least 36mm.

[0013] Preferably, the ignition means includes a regulator. The ignition means may comprise a temperature sensor. The ignition means may also comprise an ignition needle. Said regulator is preferably installed inside the gas cartridge holder or compartment. Preferably, said temperature sensor is disposed on the bottom of the furnace chamber. Preferably, said ignition needle is assembled beneath the burner.

[0014] Preferably, the portable explosion-resistant gas stove comprises a wind-shield ring. More preferably, the wind-shield ring has an outer diameter of at least 186mm.

[0015] Preferably, the portable explosion-resistant gas stove comprises four legs which are attached to the bottom of said casing. Preferably, there is no opening in the bottom of said casing.

[0016] Preferably, the thermal insulation and/or cooling elements include thermal insulation stickers which are disposed on an underside surface of the top of the cartridge compartment lid.

[0017] Preferably, the stove may have thermal insulation elements. It is preferred that said thermal insulation and/or cooling elements include heat dissipation openings on the top of said gas cartridge compartment lid.

[0018] It is preferred that said heat dissipation openings on the top of said gas cartridge compartment lid are in the shape of holes or gratings.

[0019] It is preferred that said thermal insulation and/or cooling elements include elongated heat dissipation openings disposed through the side wall of said cartridge compartment lid allowing upward air flow.

[0020] In another aspect, the invention provides a portable explosion-resistant gas stove comprising a casing, a burner, an ignition means, a gas cartridge holder, a gas cartridge compartment lid, thermal insulation and/or cooling elements. The burner is mounted inside the casing and connected to the ignition means; the gas cartridge holder is attached to the casing and the gas cartridge compartment lid covers outside the gas cartridge holder; the thermal insulation and/or cooling elements are disposed on the casing and the gas cartridge compartment lid. Said thermal insulation and/or cooling elements include elongated heat dissipation openings disposed through the side wall of said cartridge compartment lid allowing upward air flow and a thermal insulation pad disposed on an underside surface of the top of the gas cartridge compartment lid. Every said elongated heat dissipation opening is 64.5mm long and 9mm wide and total area of these openings is 6750mm 2 . Said thermal insulation pad is 185mm long, 50mm wide and 0.1mm thick and is made up of aluminium foil.

[0021] This invention has following advantages: the present invention is more suitable to be used outdoors, especially on the beach, since it has a one-piece bottom panel without any opening to avoid other things entering the gas stove; the shortest distance between the burner and the gas cartridge holder not only saves cost but also results in a smaller gas stove which is easier to carry; comparing to existing art regarding gas stoves, this invention has more heat dissipation openings and larger total heat dissipation area; furthermore, heat dissipation openings disposed through the side wall of said cartridge compartment lid allowing upward air flow providing more efficient heat dissipation; thermal insulation and/or heat dissipation elements on the top of its gas cartridge compartment lid can further cool down gas cartridge temperature when it is used for prolonged periods. In conclusion, this invention, with the premise that its gas cartridge temperature meets new international standard, not only saves cost for gas stove manufacturers but also makes it possible for customers to buy safer and more convenient gas stoves with an affordable price.

[0022] Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".

BRIEF DESCRIPTION OF DRAWINGS

[0023] Preferred embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings as set out below.

[0024] Figure 1 illustrates a schematic view of the structure of one embodiment of the invention and an exploded view of a knob.

[0025] Figure 2 illustrates a schematic view of the structure of the embodiment of the invention after a gas cartridge is installed.

[0026] Figure 3 illustrates a schematic view of the embodiment of the present invention with a gas cartridge compartment lid and said lid is closed.

[0027] Figure 4 is a lateral section view of the embodiment of the present invention.

[0028] Figure 5 is a lateral view of the embodiment of the present invention.

[0029] Figure 6 is a back view of the embodiment of the present invention.

[0030] Figure 7 illustrates a schematic view of the structure and position of a thermal insulation pad of an embodiment of the present invention.

[0031] Figure 8 illustrates a schematic view of the structure and position of heat dissipation elements of an embodiment of the present invention.

[0032] Figure 9 illustrates a schematic view of the structure and position of heat dissipation elements of another embodiment of the present invention.

[0033] Figure 10 is a plan view of the embodiment of the present invention with a gas cartridge installed and the gas cartridge compartment lid is open.

[0034] Figure 11 shows results of thermal insulation and/or cooling test 1 of the embodiment of the present invention.

[0035] Figure 12 shows results of thermal insulation and/or cooling test 2 of the embodiment of the present invention.

[0036] Figure 13 shows results of thermal insulation and/or cooling test 3 of the embodiment of the present invention.

[0037] Figure 14 shows results of thermal insulation and/or cooling test 4 of the embodiment of the present invention.

[0038] Figure 15 shows results of thermal insulation and/or cooling test 5 of the embodiment of the present invention.

[0039] Figure 16 shows results of thermal insulation and/or cooling test 6 of the embodiment of the present invention.

[0040] Figure 17 shows results of thermal insulation and/or cooling test 7 of the embodiment of the present invention.

[0041] Figure 18 shows results of thermal insulation and/or cooling test 8 of the embodiment of the present invention.

Definition of Reference Numbers of Attached Drawings

[0042] 1, top panel; 2, burner; 3, knob; 4, pan support; 5, leg; 6, wind-shield ring; 7, bottom panel; 8, separating plate; 9, back panel; 10, front panel; 11, gas cartridge; 11a, front of gas cartridge upper surface; 11b, middle of gas cartridge upper surface; 11c, back of gas cartridge upper surface; 11d, middle of gas cartridge lower surface; 12, regulator; 13, temperature sensor; 14, ignition needle; 15, rotating shaft; 16, fluid holder; 17, cartridge holder knob; 18, elongated heat dissipation openings; 19, top panel heat dissipation openings; 20, gas cartridge compartment lid; 21, thermal insulation pad; 22, heat dissipation openings on the side panel; 23, heat dissipation holes on gas cartridge compartment lid top; 24, heat dissipation gratings on gas cartridge compartment lid top; 25, gas supply pipe; 26, reinforcing ridge; a, horizontal distance between burner centre and gas cartridge compartment centre; b, longitudinal distance between burner top and gas cartridge longitudinal central axis c, height of pan support.

DETAILED DESCRIPTION OF EMBODIMENTS

[0043] The present invention will be described hereinafter in greater detail by reference to attached drawings and the following embodiment. The following embodiment is merely intended to be illustrative and shall not limit the scope of the present invention to the following description.

[0044] Referring to Figure 1 which illustrates a schematic view of the structure of a portable explosion-resistant gas stove according to one embodiment of the present invention and an exploded view of a knob. The portable explosion-resistant gas stove includes a casing, a burner, an ignition means, thermal insulation and/or cooling elements. Said casing comprises a top panel 1, a back panel 9, a side panel and a bottom panel 7(see Figure 5). There are legs 5 beneath said bottom panel 7. In this embodiment, the gas stove also includes a separating plate 8 which is attached to top panel 1, front panel 10 and back panel 9 and a regulator 12 which is fixed on said separating plate 8. A knob 3 is installed on a rotating shaft 15 of the regulator12. The vertical distance between said regulator 12 and top panel 1 is at least 47mm. The regulator 12 has double or triple safety devices. Thermal insulation and/or cooling elements in this embodiment comprise top panel heat dissipation openings 19 on the top panel 1 of said casing and heat dissipation gratings on the back panel 9. Pan supports 4 and a wind-shield ring 6 are mounted on a fluid holder 16 which is removable from or fixed on the top panel 1. Outer diameter of said wind-shield ring is at least 186mm. A cartridge holder knob 17 is disposed on the separating plate 8 and it has two positions, namely lock and unlock.

[0045] Referring to Figure 2 which illustrates a schematic view of the structure of the embodiment of the invention after a gas cartridge is installed. In the present embodiment, firstly turn the cartridge holder knob 17 to unlock position, insert top of the gas cartridge 11 into the regulator 12, turn the cartridge holder knob 17 to lock position, then adjust knob 3 and gas inside the gas cartridge 11 will be delivered to the burner 2 through a gas supply pipe 25, finally spark from ignition needle 14 will ignite the gas.

[0046] Referring to Figure 3 which illustrates an embodiment of the present invention with a gas cartridge compartment lid 20. The gas cartridge compartment lid 20 covers outside the gas cartridge 11 to define a closed gas cartridge compartment. There are thermal insulation and/or cooling elements, namely elongated heat dissipation openings 18, on the gas cartridge compartment lid 20. In this embodiment, the elongated heat dissipation openings 18 are gratings being perpendicular to and extending onto the top of the gas cartridge compartment lid 20. Each said grating is 64.5mm long and 9mm wide so as to prevent users'fingers from reaching into the gas cartridge compartment, and total area of the gratings is 6750mm 2 . In order to avoid food or other things dropping into the gas cartridge compartment when the gas stove is in use, the heat dissipation openings on the top of the gas cartridge compartment lid should not extend too much.

[0047] The elongated heat dissipation openings 18 are reinforced by reinforcing ridges 26 to avoid deformation during operation.

[0048] Referring to Figure 4, a burner comprising the burner 2 and the gas supply pipe 25 is mounted on the bottom panel 7; an ignition means is connected to the burner 2 and the ignition needle 14 is beneath the burner 2; a temperature sensor 13 is installed on the on the bottom panel 7 and top of the gas cartridge 11 is connected to the regulator 12. Horizontal distance between burner centre and gas cartridge longitudinal central axis a should be at least 179mm and longitudinal distance between burner top and gas cartridge longitudinal central axis b should be at least 54mm.

[0049] Referring to Figure 5 which illustrates a lateral view of the embodiment of the present invention, height of pan supports c should be at least 36mm.

[0050] Referring to Figure 6 which illustrates a back view of the embodiment of the present invention, there isn't any opening on the bottom panel 7 so as to avoid other things entering the gas stove when it is used at outdoor places like beaches.

[0051] Referring to Figure 7 which illustrates a schematic view of the structure and position of a thermal insulation pad of an embodiment of the present invention. In the embodiment, the gas stove includes a gas cartridge compartment lid 20. The gas cartridge compartment lid 20 covers outside the gas cartridge 11 to define a closed gas cartridge compartment. There are thermal insulation and/or cooling elements, namely elongated heat dissipation openings 18, on the gas cartridge compartment lid 20. In the embodiment, the elongated heat dissipation openings 18 are gratings being perpendicular to and extending onto the top of the gas cartridge compartment lid 20. Each grating is 64.5mm long and 9mm wide and total area of the gratings is 6750mm 2 . In order to avoid food or other things dropping into the gas cartridge compartment when the gas stove is in use, the heat dissipation openings on the top of the gas cartridge compartment lid should not extend too much.

[0052] The elongated heat dissipation openings 18 are reinforced by reinforcing ridges 26 to avoid deformation during operation.

[0053] Meanwhile, thermal insulation and/or cooling elements in the embodiment also include a thermal insulation pad 21 disposed on an underside surface of the top of the gas cartridge compartment lid because heat from the burner 2 will flow into the gas cartridge compartment through the compartment lid and cause the compartment temperature to rise. With a total area of 9250mm2 , said thermal insulation pad 21 is made from thermal insulation material such as aluminium, tin, plastic, marble, asbestos, etc. and is 185mm long, 50mm wide and 0.1mm thick.

[0054] In the embodiment, the thermal insulation and/or cooling elements also include heat dissipation openings on the side panel 22.

[0055] Referring to Figure 8 which illustrates a schematic view of the structure and position of heat dissipation elements of an embodiment of the present invention. In the embodiment, the gas stove includes a gas cartridge compartment lid 20. The gas cartridge compartment lid 20 covers outside the gas cartridge 11 to define a closed gas cartridge compartment. There are thermal insulation and/or cooling elements, namely elongated heat dissipation openings 18, on the gas cartridge compartment lid 20. In the embodiment, the elongated heat dissipation openings 18 are gratings being perpendicular to and extending onto the top of the gas cartridge compartment lid 20. Every said grating is 64.5mm long and 9mm wide and total area of the gratings is 6750mm 2 . In order to avoid food or other things dropping into the gas cartridge compartment when the gas stove is in use, the heat dissipation openings on the top of the gas cartridge compartment lid should not extend too much.

[0056] The elongated heat dissipation openings 18 are reinforced by reinforcing ridges 26 to avoid deformation during operation.

[0057] In addition, the thermal insulation and/or cooling elements in the embodiment also comprise heat dissipation holes on gas cartridge compartment lid top 23. Said heat dissipation holes 23 are circular and diameter of each hole is 2mm. They are in the shape of holes to prevent other things dropping into the compartment through them. Otherwise, the whole lid top can be hollowed-out.

[0058] Referring to Figure 9 which illustrates a schematic view of the structure and position of heat dissipation elements of another embodiment of the present invention. In the embodiment, the gas stove includes a gas cartridge compartment lid 20. The gas cartridge compartment lid covers outside the gas cartridge 11 to define a closed gas cartridge compartment. There are thermal insulation and/or cooling elements, namely elongated heat dissipation openings 18, on the gas cartridge compartment lid 20. In the embodiment, the elongated heat dissipation openings 18 are gratings being perpendicular to and extending onto the top of the gas cartridge compartment lid 20. Every said grating is 64.5mm long and 9mm wide and total area of the gratings is 6750mm 2 . In order to avoid food or other things dropping into the gas cartridge compartment when the gas stove is in use, the heat dissipation openings on the top of the gas cartridge compartment lid should not extend too much. The elongated heat dissipation openings 18 are reinforced by reinforcing ridges 26 to avoid deformation during operation.

[0059] In addition, the thermal insulation and/or cooling elements in the embodiment also comprise heat dissipation gratings through gas cartridge compartment lid top 24. Each of said heat dissipation gratings 24 is 30mm long and 2mm wide. They are in the shape of gratings to prevent other things dropping into the compartment through them. Otherwise, the whole lid top can be hollowed-out.

[0060] Referring to Figure 10 which illustrates a plan view of the embodiment of the present invention with a gas cartridge installed and the gas cartridge compartment lid is open. Following tests have been conducted to measure temperature of the front of the gas cartridge upper surface 11a, the middle of the gas cartridge upper surface 11b, the back of the gas cartridge upper surface 11c and the middle of the gas cartridge lower surface 11d when the gas stove is in operation. Embodiments illustrated in figure-9 are based on but not limited to results of the following tests.

Test 1

[0061] Test subject: the subject of test 1 is a gas stove which has shorter heat dissipation openings on its gas cartridge compartment lid and no thermal insulation pad 21 and the distance between its burner centre and gas cartridge compartment centre a is 149mm. A 350X350X mm iron plate is used as a cooking tray. Test method: put the gas stove on a test table and insert a gas cartridge 11. Connect an automatic balance recording meter to the front of the gas cartridge upper surface 11a, the middle of the gas cartridge upper surface 11b, the back of the gas cartridge upper surface 11c and the middle of the gas cartridge lower surface 11d. Measure and record their initial temperatures. Ignite the burner 2 and put the 350 X 350 X 10mm iron plate onto pan supports 4. Record temperatures of the above four positions every minute. The test lasts for about an hour and a half. During the test, indoor temperature is 26C, humidity is 41% and barometric pressure is 1010hpa. The test is repeated five times.

[0062] According to Figure 11 which shows results of the test, temperature of the middle of the gas cartridge lower surface 1ld is far lower than those of the other three positions and it does not rise as cooking proceeds. However, it will be influenced when the whole gas cartridge is overheated. Therefore, it shows that heat which causes the gas cartridge 11 to overheat transfers through the upper surface of the gas cartridge 11. The other three curves of the front of the gas cartridge upper surface 11a, the middle of the gas cartridge upper surface 11b and the back of the gas cartridge upper surface 11c show that temperature of the gas cartridge upper surface rises gradually as the cooking proceeds. In particular, temperature of the middle of the gas cartridge upper surface 11b reaches up to 51.3 °C at 91 minutes.

Test 2

[0063] Test subject: the subject of test 2 is a gas stove which has elongated heat dissipation openings on its gas cartridge compartment lid and the distance between its burner centre and gas cartridge compartment centre is 169mm. A 350x350x10mm iron plate is used as a cooking tray. Test method: put the gas stove on a test table and insert a gas cartridge 11. The gas stove is 697mm from the ground and pressure of the gas cartridge is 630mmH 20. Connect an automatic balance recording meter to the middle of the gas cartridge upper surface 11b. Measure and record its initial temperature. Ignite the burner 2 and put the 350x350x10mm iron plate onto the pan supports 4. Record temperature of the middle of the gas cartridge upper surface 11b every minute. The test lasts for about an hour and a half. The initial temperature of the gas cartridge is 220C. During the test, indoor temperature is 270C, humidity is 34% and barometric pressure is 1025hpa. The test is repeated five times.

[0064] According to Figure 12 which shows results of the test, temperature of the gas cartridge upper surface gradually rises as cooking proceeds and it surpasses 500C after 76 minutes.

Test 3

[0065] Test subject: the subject of test 3 is an embodiment of the present invention. The embodiment is a gas stove which has elongated heat dissipation openings on its gas cartridge compartment lid and the distance between its burner centre and gas cartridge compartment centre a is 179mm. A 350x350x10mm iron plate is used as a cooking tray. Test method: put the gas stove on a test table and insert a gas cartridge 11. The gas stove is 697mm from the ground and pressure of the gas cartridge is 630mmH 2 0. Connect an automatic balance recording meter to the middle of the gas cartridge upper surface 11b. Measure and record its initial temperature. Ignite the burner 2 and put the 350x350x10mm iron plate onto the pan supports 4. Record temperature of the middle of the gas cartridge upper surface 11b every minute. The test lasts for about an hour and a half. The initial temperature of the gas cartridge is 220C. During the test, indoor temperature is 250C, humidity is 30% and barometric pressure is 1025hpa. The test is repeated five times.

[0066] According to Figure 13 which shows results of the test, temperature of the gas cartridge upper surface gradually rises as cooking proceeds. But it doesn't surpass 50°C after 84 minutes. Therefore, 179mm is the best distance between the burner centre and gas cartridge compartment centre.

Test 4

[0067] Test subject: the subject of test 4 is an embodiment of the present invention. The embodiment is a gas stove which has shorter heat dissipation openings on its gas cartridge compartment lid and no thermal insulation pad 21 or heat dissipation openings on the side panel 22. Four 350x350x10mm iron plates are used as cooking trays. Test method: put four said gas stoves on four test tables and insert four gas cartridges 11 to them. The first gas stove is 713mm from the ground and pressure of its gas cartridge is 630mmH 20. The second gas stove is 715mm from the ground and pressure of its gas cartridge is 61OmmH 20. The third gas stove is 697mm from the ground and pressure of its gas cartridge is 620mmH 20. The forth gas stove is 697mm from the ground and pressure of its gas cartridge is 620mmH 2 0. Connect an automatic balance recording meter to the middle of their gas cartridge upper surfaces 11b. Measure and record their initial temperatures. Ignite their burners 2 and put the 350x350x10mm iron plates onto their pan supports 4. Record temperatures of the middle of their gas cartridge upper surfaces 11b every minute. The test lasts for about an hour and a half. The initial temperatures of the four gas cartridges are all 220C. During the test, indoor temperature is 23-24°C, humidity is 18% and barometric pressure is 1027hpa. The test is repeated five times.

[0068] According to Figure 14 which shows results of the test, temperatures of the four gas cartridge upper surfaces gradually rise as cooking proceeds and they all surpass 500C after 90 minutes.

Test 5

[0069] Test subject: the subject of test 5 is the gas stove of the test 3 with some modifications. Totally, three said gas stoves are needed and they all have heat dissipation openings on their back panels and heat dissipation openings on their side panels 22. In particular, gas stove 1 has shorter heat dissipation openings on its gas cartridge compartment lid and a thermal insulation pad 21 which is 180mm X 50mm X 0.7mm and made of asbestos; gas stove 2 also has shorter heat dissipation openings on its gas cartridge compartment lid and the top of its gas cartridge compartment lid is cut off and is erected over the gas cartridge compartment lid 20; gas stove 3 also has shorter heat dissipation openings on its gas cartridge compartment lid and its pan supports 4 are 40mm high and the top of its gas cartridge compartment lid is cut off and is erected over the gas cartridge compartment lid 20. Three 350x350x10mm iron plates are used as cooking trays. Test method: put three said gas stoves on three test tables and insert three gas cartridges 11 to them. Connect an automatic balance recording meter to the middle of their gas cartridge upper surfaces 11b. Measure and record their initial temperatures. Ignite their burners 2 and put the 350x350x10mm iron plates onto their pan supports 4. Record temperatures of the middle of their gas cartridge upper surfaces 11b every minute. The test lasts for about an hour and a half. During the test, indoor temperature is 25C, humidity is 27% and barometric pressure is 1013hpa. The test is repeated five times.

[0070] According to Figure 15 which shows results of the test, temperatures of the three gas cartridge upper surfaces gradually rise as cooking proceeds. But they are all below 500C after minutes. More particularly, temperature of the gas stove 1 reaches 50.1C at 96 minutes and it fluctuates above 500C as cooking proceeds; temperatures of the gas stove 2 and 3 remains far below 500C after 100 minutes. Comparing results of gas stoves 1, 2, and 3, it shows that removing part of the gas cartridge compartment lid 20 will significantly improve heat dissipation.

Test 6

[0071] Test subject: the subject of test 6 is the gas stove of the test 3 with some modifications. More particularly, four said gas stoves are needed and they all have shorter heat dissipation openings on their gas cartridge compartment lids and thermal insulation pads 21. The gas stove 1 has a 180mm X 50mm X 0.4mm iron thermal insulation plate beneath the top of its gas cartridge compartment lid. The gas stove 2 has a piece of 180mmX 50mm tinfoil beneath the top of its gas cartridge compartment lid. The gas stove 3 also has a piece of 180mmX50mm tinfoil beneath the top of its gas cartridge compartment lid. The gas stove 4 also has a piece of 180mm X 50mm tinfoil beneath the top of its gas cartridge compartment lid and heat dissipation openings on its top, side and back panels are all sealed with tinfoil. Four 350x350x10mm iron plates are used as cooking trays. Test method: put four said gas stoves on four test tables and insert four gas cartridges 11 whose pressures are respectively 630mmH20, 61OmmH20, 620mmH20 and 620mmH20 to them. The four gas stoves are respectively 715mm, 710mm, 720mm and 695mm from the ground. Connect an automatic balance recording meter to the middle of their gas cartridge upper surfaces 11b. Measure and record their initial temperatures. Ignite their burners 2 and put the 350x350x10mm iron plates onto their pan supports 4. Record temperatures of the middle of their gas cartridge upper surfaces 11b every minute. The test lasts for about an hour and a half. The initial temperatures of the four gas cartridges are all 220C. During the test, indoor temperature is 21-23°C, humidity is 20% and barometric pressure is 1012hpa. The test is repeated five times.

[0072] According to Figure 16 which shows results of the test, temperatures of the four gas cartridge upper surfaces gradually rise as cooking proceeds and temperature of the gas stove 1 surpasses 500C after 90 minutes while those of the other three don't.

Test 7

[0073] Test subject: the subject of test 7 is the gas stove of the test 3 with some modifications. More particularly, one said gas stove is needed and it has shorter heat dissipation openings on its gas cartridge compartment lid and a thermal insulation pad 21. The thermal insulation pad 21 is a plastic board which is 1.5mm thick, 185mm long and 50mm wide. A 350x350x10mm iron plate is used as a cooking tray. Test method: put the gas stove onto a test table and insert a gas cartridge 11. Connect an automatic balance recording meter to the front of the gas cartridge upper surface 11a, the middle of the gas cartridge upper surface 11b and the back of the gas cartridge upper surface 11c. Measure and record their initial temperatures. Ignite the burner 2 and put the 350 X 350 X 10mm iron plate onto pan supports 4. Record temperatures of the above three positions every minute. The test lasts for about an hour and a half. During the test, indoor temperature is 250C, humidity is 54% and barometric pressure is 101Ohpa. The test is repeated five times.

[0074] According to Figure 17 which shows results of the test, temperatures of the front of the gas cartridge upper surface 1la, the middle of the gas cartridge upper surface 11b and the back of the gas cartridge upper surface 11c gradually rise as cooking proceeds. But they all don't surpass 400C after 90 minutes.

Test 8

[0075] Test subject: the subject of test 8 is the gas stove of the test 3 with some modifications. More particularly, one said gas stove is needed and it has elongated heat dissipation openings 18 and a thermal insulation pad 21. It also has a piece of 185mmX 50mm 5C aluminium foil beneath its gas cartridge compartment lid top. Test method: put the gas stove on a test table and insert a gas cartridge 11 whose pressure is 640mmH20. The gas stove is 715mm from the ground. Connect an automatic balance recording meter to the middle of the gas cartridge upper surface 11b. Measure and record initial temperature of this position. Ignite the burner 2 and put a 350 X 350 X 10mm iron plate onto pan supports 4. Record temperature of the above position every minute. The test lasts for about an hour and a half. The initial temperature of the gas cartridge is 220C. During the test, indoor temperature is 240C, humidity is 18% and barometric pressure is 1025hpa. The test is repeated five times.

[0076] According to Figure 18 which shows results of the test, temperature of the gas cartridge upper surface gradually rises as cooking proceeds. But it doesn't surpass 500C after 108 minutes.

Claims

1. A portable explosion-resistant gas stove which comprises a casing, a burner, an ignition means, a gas cartridge compartment for receiving a gas cartridge that supplies gas to the burner, and one or more cooling elements; wherein the burner is mounted inside the casing and connected to the ignition means; wherein the gas cartridge compartment is attached to the casing and at least one cooling element is disposed on a top panel of the casing; and wherein a horizontal distance between a centre of the burner and a centre of the gas cartridge compartment is 179mm or above.

2. A portable explosion-resistant gas stove according to claim 1, wherein the at least one cooling element is formed in the top panel of the casing between the burner and the gas cartridge compartment.

3. A portable explosion-resistant gas stove according to claim 1 or 2, wherein the one or more cooling elements are disposed on at least one side panel of the casing.

4. A portable explosion-resistant gas stove according to any one of the preceding claims, wherein the one or more cooling elements comprise heat dissipation openings

5. A portable explosion-resistant gas stove according to claim 4 wherein said heat dissipation openings are in the shape of holes or gratings.

6. A portable explosion-resistant gas stove according to claim 4 or 5, wherein the heat dissipation openings are elongate and are disposed through a side wall of said cartridge compartment lid to allow upward air flow.

7. A portable explosion-resistant gas stove according to any one of the preceding claims, comprising a gas cartridge compartment lid, covering the outside of the gas cartridge compartment.

8. A portable explosion-resistant gas stove according to claim 7, wherein the one or more cooling elements are disposed on the gas cartridge compartment lid.

9. A portable explosion-resistant gas stove according to claim 7 or 8, wherein one or more thermal insulation stickers are disposed on an underside surface of the top of the gas cartridge compartment lid.

10. A portable explosion-resistant gas stove according to any one of the preceding claims, wherein a vertical distance between a top of the burner and the centre of the gas cartridge compartment is at least 54mm.

11. A portable explosion-resistant gas stove according to any one of the preceding claims, further comprising one or more pan supports, wherein the height of the one or more pan supports is at least 36mm.

12. A portable explosion-resistant gas stove according to any one of the preceding claims, further comprising a wind-shield ring.

13. A portable explosion-resistant gas stove according to claim 12, the wind-shield ring has an outer diameter of at least 186mm.

14. A portable explosion-resistant gas stove according to any one of the preceding claims wherein the ignition means includes a regulator.

15. A portable explosion-resistant gas stove according to claim 14, wherein the regulator is installed inside said gas cartridge compartment.

16. A portable explosion-resistant gas stove according to any one of the preceding claims, wherein the ignition means includes a temperature sensor.

17. A portable explosion-resistant gas stove according to claim 16, wherein the temperature sensor is disposed on the bottom of said furnace chamber.

18. A portable explosion-resistant gas stove according to any one of the preceding claims, wherein the ignition means includes an ignition needle assembled beneath the burner.

19. A portable explosion-resistant gas stove according to any one of the preceding claims, further comprising four legs which are attached to the bottom of said casing.

20. A portable explosion-resistant gas stove according to claim 19, wherein there is no hole in the bottom of said casing.