CN111473368B - Safety Device for Cassette Gas Furnace - Google Patents

Abstract

A safety device of a card type gas stove is suitable for detachably connecting a gas tank to supply gas, and comprises a base body unit, an air tap unit and a safety unit. The seat body unit defines an air outlet chamber, a first accommodating groove communicated with the air chamber and a second accommodating groove communicated with the first accommodating groove. The air tap unit comprises a magnetic ring arranged outside the second accommodating groove, a push pipe movably arranged in the second accommodating groove, and a valve shaft movably arranged in the push pipe in a penetrating mode. The safety unit includes a shaft movably mounted in the first vessel. When the air pressure is too high, on one hand, the shaft rod can be driven by high-pressure air to automatically block the passage between the first containing groove and the air chamber, and on the other hand, the valve shaft can also be driven by the high-pressure air to drive the push pipe to push the gas tank away, so that the supply of the gas is interrupted, and double safety protection is formed to avoid accidents.

Description

Safety Device for Cassette Gas Furnace

technical field

The invention relates to a cassette gas furnace, in particular to a safety device for the cassette gas furnace which is installed in the cassette gas furnace and can prevent excessive gas pressure.

Background technique

In recent years, due to the characteristics of light weight and convenient carrying, cassette gas stoves have been widely used in various occasions where cooking and barbecue are required. However, because a gas tank must be installed in the cassette gas furnace to provide a gas such as gas for a furnace head as a fuel, but when it is used for combustion, it is often accompanied by gas leakage or excessive pressure. Unsafe factors such as fire or explosion can easily lead to dangerous accidents. Therefore, manufacturers usually install a safety device between the gas tank and the burner to prevent the above accidents.

At present, the safety devices developed by the industry can be divided into two types: snap-on type and magnetic suction type if they are combined with the gas tank. The first is that when the gas pressure is too large, it will automatically block the gas flow path and interrupt the gas supply, such as the safety device of the cassette gas furnace disclosed in the Chinese Taiwan Bulletin No. M342484 patent, the second is when the gas When the pressure is too high, the gas tank can be automatically pushed open to interrupt the gas supply to the gas tank. A safety mechanism, such as the gas regulator with double overvoltage protection disclosed in Taiwan Bulletin No. M547079.

The present invention is designed for the above-mentioned magnetic suction type safety device with two safety mechanisms, and further provides a safety device for a cassette gas stove with an innovative structure for consumers to choose and use.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a safety device for a gas cassette furnace that can overcome at least one disadvantage of the background art.

The safety device of the cassette gas stove of the present invention is suitable for detachably connecting the gas tank to supply gas, the safety device comprises: a base unit, a gas nozzle unit, and a safety unit, the base unit defines a gas outlet a chamber, a first accommodating groove extending along the left-right direction and communicating with the air chamber, and a second accommodating groove extending along the front-rear direction and communicating with the first accommodating groove, the air nozzle unit includes a The magnetic ring outside the second accommodating groove of the body unit, the push tube movably installed in the second accommodating groove, and the valve shaft movably passing through the push tube; the air nozzle unit It can be changed between the non-inflated state, the inflated state, and the safe state. When the air nozzle unit is in the non-inflated state, it is not magnetically connected to the gas tank. When the air nozzle unit is in the inflated state, all the The magnetic ring is magnetically connected to the gas tank, and the gas tank is inserted into the push pipe and pushes the valve shaft to move forward to allow the gas to flow into the first container, and the gas nozzle unit is located in the In the safe state, the high-pressure gas in the first container forces the valve shaft to drive the push tube to move backwards and push the gas tank, so that the gas tank is separated from the magnetic ring and does not supply gas , the safety unit includes a shaft rod movably installed in the first accommodating groove; the shaft rod moves between a ventilated position and a non-ventilated position relative to the seat unit, and the shaft rod is in the In the ventilation position, the gas in the first container can flow into the air chamber, and when the shaft is in the non-ventilation position, it is pressed by the high-pressure gas in the first container to move outward , so that the gas in the first container cannot flow into the gas chamber to interrupt the gas supply.

In the safety device of the cassette gas stove of the present invention, the base unit further defines a first through hole that communicates with the first cavity and the gas chamber, and communicates the first cavity with the second cavity. The second through hole of the accommodating groove; when the shaft rod of the safety unit is in the ventilating position, the first accommodating groove and the first through hole communicate with each other, and when the shaft rod is in the non-ventilating position , closing the first through hole so that the first container is not communicated with the first through hole.

In the safety device of the cassette gas furnace of the present invention, the push pipe of the gas nozzle unit has a pipe hole extending along the front-rear direction and accommodating the valve shaft, and the pipe hole has an inclined tapered hole portion; When the air nozzle unit is in the non-inflated state, the valve shaft blocks the oblique cone hole portion that closes the push tube, and when the air nozzle unit is changed from the non-inflated state to the inflated state, the The valve shaft is pushed away from the oblique cone hole by the gas tank, and cooperates with the push tube to form a gap for gas to pass through. When the gas nozzle unit is in the safe state, the valve A shaft block closes the inclined tapered hole portion of the push tube.

In the safety device of the cassette gas stove of the present invention, the gas nozzle unit further comprises a magnetic seat fixed on the seat unit and accommodating the magnetic ring, fixedly disposed in the center of the magnetic seat and extending into the magnetic seat a sleeve in the second accommodating groove and in which the push tube is accommodated, a front ring arranged on the front side of the inner peripheral surface of the sleeve, a rear ring arranged on the rear side of the inner peripheral surface of the sleeve, a return spring arranged between the push tube and the rear ring, and a push spring arranged between the valve shaft and the seat unit; the air nozzle unit is transformed from the uninflated state to the In the inflated state, the valve shaft moves forward to compress the push spring, and when the air nozzle unit changes from the inflated state to the safe state, the push spring releases the elastic force and pushes the valve shaft backward Move, drive the push tube to move backwards and compress the return spring, when the air nozzle unit changes from the safe state to the uninflated state, the return spring releases the elastic force and pushes the push tube forward. Move the valve shaft to reset.

In the safety device of the cassette gas furnace of the present invention, the gas nozzle unit further includes a plurality of gas seals, and the gas seals are respectively installed between the sleeve and the front ring, the sleeve and the rear ring between the outer periphery of the push tube and the sleeve, the rear side of the inner peripheral surface of the push tube, and between the outer periphery of the valve shaft and the push tube.

In the safety device for a cassette gas furnace of the present invention, the base unit includes a first plug plugged at one end of the first container and adjacent to the second through hole, and a first plug installed in the first container The other end of the groove is a second plug for the shaft to extend, and the safety unit further includes an elastic force arranged between the shaft and the second plug and has an elastic force to make the shaft move and reset a compression spring, and several rings sleeved on the periphery of the shaft, the shaft has a first end adjacent to the second through hole, and a second end protruding from the second plug part, the shaft defines a channel extending from the end face of the first end towards the second end and then radially upwards; when the shaft is in the ventilation position, the The channel is communicated with the first through hole, the gas flowing into the first through hole from the second tank enters the gas chamber through the channel and the first through hole, and the shaft rod is in the non-contact state. In the ventilation position, the passage is not connected to the first through hole, so that the gas in the first container cannot enter the gas chamber.

In the safety device for a gas stove of the present invention, the shaft further defines a slot adjacent to the second end and is concavely formed on the outer peripheral surface, and the safety device further includes a clip for positioning the shaft. The locking unit of the rod, the locking unit includes a card plate pivotally connected to the base body unit, and is installed between the seat body unit and the card plate and has the function of swinging the card plate an elastic torsion spring toward the shaft; when the shaft is in the vent position, the clip rests on the second end of the shaft, and the shaft is outward When moving to the airtight position, the card plate is swung by the elastic force of the torsion spring and partially embedded in the card groove of the shaft for positioning.

In the safety device of the cassette gas stove of the present invention, the safety unit further comprises a rod head fixedly connected to the end of the shaft extending out of the second plug head and located outside the clamp plate.

In the safety device of the cassette gas stove of the present invention, the base unit includes a base and a top cover covering the base, and the safety device further includes a control device for controlling the first through hole and the The air valve unit of whether the air chamber is connected or not, the air valve unit includes a valve rod located in the air chamber and pivoted on the base in a swingable manner, a valve rod disposed laterally on the base and the top The piston is connected between the covers and the bottom of the valve stem, and a pressing spring is installed between the center of the piston and the top cover and has an elastic force that pushes the piston downward; The gas in the gas chamber pushes the piston and compresses the pressing spring, so that the piston drives the valve stem upward to close the first through hole. After the gas output is released, the pressing The spring will push the piston and the valve stem back.

In the safety device of the cassette gas stove of the present invention, the base unit further defines a third accommodating groove extending along the front-rear direction and communicating with the gas chamber, and the safety device further includes a movably disposed on the A switch unit for controlling whether the gas is output to the gas chamber or not and the flow rate in the third container.

The beneficial effect of the present invention is: through the arrangement of the air nozzle unit and the safety unit, when the air pressure is too high, double safety protection can be formed to avoid accidents.

Description of drawings

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein:

Fig. 1 is a partial perspective exploded view of an embodiment of the safety device of the cassette gas stove of the present invention;

Figure 2 is a cross-sectional side view of the embodiment taken in a front-to-rear direction, illustrating a valve unit in an uninflated state;

Fig. 3 is an incomplete enlarged view of Fig. 2;

Figure 4 is a cross-sectional front view of the embodiment taken in a left-right direction, illustrating a shaft in a vent position;

FIG. 5 is a cross-sectional view similar to FIG. 2, illustrating the valve unit in an inflated state;

Fig. 6 is a fragmentary enlarged view of Fig. 5;

Figure 7 is a cross-sectional view similar to Figure 4, illustrating the shaft in a non-vented position;

Figure 8 is a side view of the embodiment; and

Figure 9 is an enlarged view similar to Figure 6, illustrating the valve unit in a safe state.

Detailed ways

Referring to FIGS. 1-4, an embodiment of the safety device for a gas cassette furnace of the present invention is suitable for detachably connecting a gas tank 1 for outputting and supplying gas such as gas, and the gas tank 1 has a A tank 11 containing the gas, a nozzle 12 telescopically arranged in the center of one end of the tank 11 , and a nozzle 12 protruding from one end of the tank 11 and surrounding the nozzle 12 . Top ring 13. The safety device includes a seat unit 2 , a gas nozzle unit 3 , a safety unit 4 , a locking unit 5 , a gas valve unit 6 , and a switch unit 7 .

The seat unit 2 defines an air chamber 20 extending along an up-down direction Z and opening upward, a first accommodating groove 21 located below the air chamber 20 and extending along a left-right direction Y, a communication The first accommodating groove 21 and the first through hole 22 of the air chamber 20, a second accommodating groove 23 located below the air chamber 20 and extending along a front-rear direction X, and a second accommodating groove 23 communicating with the first accommodating chamber 20. The groove 21 and the second through hole 24 of the second container groove 23, and a third container groove 25 extending along the front-rear direction X and communicating with the air chamber 20 and an output port (not shown).

In terms of structure, the base unit 2 includes a base 26 , a top cover 27 that covers the base 26 , and a top cover 27 that is sealed at one end of the first accommodating groove 21 and is adjacent to the first accommodating groove 21 . A first plug 28 of the two through holes 24 and a second plug 29 installed at the other end of the first receiving groove 21 . The air chamber 20 , the first accommodating groove 21 , the first through hole 22 , the second accommodating groove 23 , the second through hole 24 and the third accommodating groove are arranged in the base 26 . Slot 25.

The air nozzle unit 3 is arranged along the front-rear direction X, and includes a magnetic base 31 fixed outside the second accommodating groove 23 of the base unit 2 , and a magnetic base 31 fixedly arranged on the magnetic base 31 . A sleeve 32 in the center and extending into the second accommodating groove 23, a magnetic ring 33 disposed in the magnetic base 31 and sleeved on the periphery of the sleeve 32, and a magnetic ring 33 movably accommodated in the A push tube 34 in the sleeve 32, a valve shaft 35 movably passing through the push tube 34, a front ring 36 disposed on the front side of the inner circumference of the sleeve 32, a valve shaft 36 disposed in the A rear ring 37 on the rear side of the inner peripheral surface of the sleeve 32, a return spring 38 arranged between the push tube 34 and the rear ring 37, a return spring 38 arranged between the valve shaft 35 and the seat unit 2 The push spring 39, and several air seals 30.

The air seals 30 are respectively installed between the sleeve 32 and the front ring 36, between the sleeve 32 and the rear ring 37, between the periphery of the push tube 34 and the sleeve 32, The rear side of the inner peripheral surface of the push tube 34 , and between the periphery of the valve shaft 35 and the push tube 34 . The magnetic ring 33 has a magnetic attraction force suitable for magnetically attracting and positioning the top ring 13 of the gas tank 1 . The push pipe 34 has a pipe hole 341 extending along the front-rear direction X and accommodating the valve shaft 35. The front end of the pipe hole 341 can be inserted into the nozzle 12 of the gas tank 1 for pushing The valve shaft 35 and the pipe hole 341 have an inclined tapered hole portion 342 . The valve shaft 35 and the gas seal 30 sleeved on its periphery can move together, so as to close or open the inclined tapered hole portion 342 .

The safety unit 4 is disposed along the left-right direction Y, and includes a shaft rod 41 movably installed in the first accommodating groove 21 , a shaft rod 41 fixed on the shaft rod 41 and extending out of the second shaft rod 41 . A rod head 42 at one end of the plug head 29, a compression spring 43 arranged between the shaft rod 41 and the second plug head 29 and having an elastic force to reset the shaft rod 41 after moving, and several sleeves A ring 44 around the shaft 41 . The shaft 41 has a first end portion 411 facing the first plug head 28 and adjacent to the second through hole 24 , and a first end portion 411 extending out of the second plug head 29 for fixing the rod head 42 . The connected second end 412 . The shaft 41 defines a channel 413 extending from one end of the first end portion 411 toward the second end portion 412 and then opening radially upward, and a channel 413 adjacent to the second end portion 412 And a groove 414 formed on the outer peripheral surface is recessed. With the movement of the shaft 41 , the channel 413 can be directly connected to the first through hole 22 , or be displaced from the first through hole 22 and not communicated with each other.

The locking unit 5 includes a clamping plate 51 disposed on the outside of the base unit 2 and correspondingly abutting on the position where the shaft rod 41 protrudes from the second plug 29 , and a clamping plate 51 . 51 A pivot 52 pivotally pivoted on the base unit 2, a pivot shaft 52 passing through the card board 51 and fixed on the base unit 2, and used to limit the swing range of the card board 51. A pin shaft 53 and a torsion spring 54 installed between the base unit 2 and the card board 51 and having an elastic force for swinging the card board 51 toward the shaft rod 41 . The clamping plate 51 is located between the rod head 42 and the second plug head 29 correspondingly, and has a sliding groove 511 for the pin shaft 53 to slide relatively. Under normal circumstances, the card plate 51 is elastically pressed against the second end portion 412 , and when the shaft rod 41 protrudes outward, the card plate 51 will be as shown in FIGS. 7 and 8 . It is shown that the downward swing is inserted into the slot 414 , so that the shaft 41 cannot be moved due to its positioning.

The air valve unit 6 is used to control whether the first through hole 22 communicates with the air chamber 20 or not. The air valve unit 6 is arranged along the up-down direction Z and includes a swingable pivot connection. In the air chamber 20 and can be used to cover the valve stem 61 of the first through hole 22, a peripheral edge is laterally disposed between the base 26 and the top cover 27, and the center of the bottom is connected to the valve stem The piston 62 of 61 , and a pressing spring 63 installed between the center of the piston 62 and the top cover 27 and having an elastic force to push the piston 62 downward.

The switch unit 7 is movably disposed in the third container 25 and can be used to control whether the gas in the gas chamber 20 is output or not and the flow rate. Since the structure and operation of the switch unit 7 are of general design and are not the focus of the present invention, they will not be described herein again.

The use of the safety device of the present invention is further described below. Generally, when the gas tank 1 has not been installed, the gas nozzle unit 3 is in an uninflated state that is not magnetically connected to the gas tank 1, and the valve shaft 35. The oblique taper hole 342 of the push tube 34 is blocked and closed. The shaft 41 of the safety unit 4 is located in a ventilating position relative to the base unit 2, so that the passage 413 communicates with the The first through hole 22, at this time, the pipe hole 341, the second through hole 24, the first container groove 21 communicate with the first through hole 22, and the shaft 41 shrinks inwardly, Therefore, the card slot 414 does not protrude out of the second plug 29 , and the card plate 51 springs against the second end portion 412 , so that the torsion spring 54 accumulates elastic force. In addition, since the gas chamber 20 is not filled with gas, the piston 62 is not pushed upward, and the piston 62 is only pressed downward by the pressing spring 63, so that the valve rod 61 is inclined away from the Above the first through hole 22 , the first through hole 22 is communicated with the air chamber 20 .

As shown in FIGS. 4 to 6 , when inflating for use, install the gas tank 1 forward on the air nozzle unit 3 along the front-rear direction X, and insert the nozzle 12 into the push tube 34 forward. The tube hole 341 pushes the valve shaft 35 forward and slides away from the inclined cone hole 342, and cooperates with the push tube 34 to form a gap 343, the valve shaft 35 will also compress the The push spring 39 causes the push spring 39 to accumulate elastic force, and when the front end of the valve shaft 35 abuts against the end surface of the base 26 bounding the second accommodating groove 23, it will relatively push the valve shaft 35. The nozzle 12 of the gas tank 1 allows the gas to be ejected from the nozzle 12 and flow into the first container 21 through the second through hole 24 through the gap 343 , while the magnetic ring 33 The top ring 13 of the gas tank 1 is also magnetically positioned, so that the air nozzle unit 3 is changed from the non-inflated state to an inflated state for the gas to be filled.

Then continue to look at the actions of other structures according to the flow direction of the gas. As shown in FIG. 4 , since the shaft 41 of the safety unit 4 is located at the ventilation position, when the gas enters the first After the accommodating groove 21 , it will flow into the channel 413 of the shaft rod 41 , and flow into the air chamber 20 through the first through hole 22 . When the gas pressure in the gas chamber 20 rises, it pushes the piston 62 upward as shown in FIG. 5 , and drives the valve rod 61 to swing to close the first through hole 22 , and at the same time compress the The pressing spring 63, and when the gas in the air chamber 20 is transported to the outside for ignition, the gas pressure in the air chamber 20 is reduced, that is, the resetting elastic force of the pressing spring 63 can push the The piston 62 and the valve rod 61 are reset, and the first through hole 22 is opened as shown in Figs. 2 and 4 for gas to enter and supplement, so the gas valve unit 6 will move back and forth between the positions shown in Fig. 2 and Fig. 5 , Can be used to automatically adjust the gas flow into the gas chamber 20 .

As shown in FIGS. 7 and 8 , when the gas pressure in the gas chamber 20 is too high, or when the gas pressure in the gas tank 1 is too high, the high-pressure gas entering the first container 21 will The shaft 41 will be forced to move outward, so that it moves from the ventilation position (see FIG. 4 ) to a non-ventilation position, so that the channel 413 and the first through hole 22 are dislocated and not communicated, and closed. The first through hole 22 is used to interrupt the gas path, so that the first container groove 21 is not connected to the first pass hole 22, and the gas in the first container groove 21 cannot flow into the gas chamber 20. The gas supply interruption flame is extinguished, thereby avoiding abnormal overpressure of the gas chamber 20, so as to have a safety effect.

In addition, when the shaft rod 41 moves toward the direction of the second plug head 29 , it not only pushes the compression spring 43 , but also protrudes from the second plug when the groove 414 of the shaft rod 41 protrudes. At the same time as the head 29, the card plate 51 can swing by the elastic force of the torsion spring 54, and is partially inserted into the card slot 414 for positioning, so as to avoid accidental or other Factors causing the shaft 41 to move back to the vent position by accident, thus further enhancing safety. When the overpressure condition is relieved and the air supply is to be resumed, as long as the clamping plate 51 is pulled to swing away from the clamping slot 414 , the shaft rod 41 can pass through the compression spring 43 The elastic force is reset, and then the clamping plate 51 is released, and the clamping plate 51 can be elastically rested on the second end portion 412 again.

As shown in FIG. 9 , on the other hand, when the gas pressure is too high, the gas nozzle unit 3 will also change from the inflation state (see FIG. 6 ) to a safe state, that is, through the first The high-pressure gas in a container 21 and the elastic force released by the push spring 39 force the valve shaft 35 to move backward to block the oblique cone hole 342 that closes the push tube 34, and then drives the valve shaft 35 to move backward. The push tube 34 moves backward and pushes the gas tank 1 until the gas tank 1 is separated from the magnetic ring 33 and no longer supplies gas. When the push tube 34 moves backward, it also compresses the return spring 38 to accumulate elastic force, so when the gas pressure returns to normal, the elastic force can be released through the return spring 38 to push the push tube 34 Together with the forward movement and reset of the valve shaft 35 , the valve unit 3 is transformed from the safe state to the non-inflated state as shown in FIG. 3 .

To sum up, in the safety device of the cassette gas furnace of the present invention, the gas nozzle unit 3 and the safety unit 4 are arranged on the base unit 2, so when the air pressure is abnormally high, on the one hand The shaft 41 of the safety unit 4 will be driven by high-pressure gas to automatically block the passage between the first container 21 and the air chamber 20 . The valve shaft 35 is also driven by the high-pressure gas, which drives the push tube 34 to push the gas tank 1 away, so that the gas tank 1 is separated from the adsorption position of the magnetic ring 33, thereby interrupting the gas supply, so And it can form a double safety protection mechanism to further strengthen the safety to avoid accidents and ensure the safety in actual use, so it can indeed achieve the purpose of the present invention.

The above are only examples of the present invention, and should not limit the scope of the present invention, that is, any simple equivalent changes and modifications made according to the claims of the present invention and the contents of the description still belong to the present invention. scope of invention.

Claims (10)

1. A safety device for a cassette gas stove, suitable for detachably connecting a gas tank to supply gas, the safety device comprising: a base unit, a gas nozzle unit, and a safety unit, the base unit defines an air outlet chamber, a first accommodating groove extending along the left-right direction and communicating with the air chamber, a second accommodating groove extending along the front-rear direction and communicating with the first accommodating groove, and communicating the first accommodating groove and the air chamber The first through hole of the chamber, and the second through hole connecting the first container groove and the second container groove, are characterized in that: The air nozzle unit includes a magnetic ring arranged outside the second accommodating groove of the base unit, a push tube movably installed in the second accommodating groove, a valve shaft in the tube, a magnetic seat fixed on the seat body unit and accommodated by the magnetic ring, a sleeve fixedly arranged in the center of the magnetic seat and accommodated by the push tube, arranged on the The front ring on the front side of the sleeve, the rear ring arranged on the rear side of the sleeve, the return spring arranged between the push tube and the rear ring, and the valve shaft and the seat body Pushing spring between units, the push tube has a tube hole for accommodating the valve shaft, and the tube hole has a slanted cone hole; the air nozzle unit can be changed between the uninflated state, the inflated state, and the safe state , when the air nozzle unit is in the non-inflated state, the gas tank is not magnetically connected to the gas tank, the valve shaft closes the oblique cone hole, and when the air nozzle unit is in the inflated state, the magnetic The ring magnetic suction connects the gas tank, and the gas tank is inserted into the push tube and pushes the valve shaft forward to move away from the inclined cone hole, so that the gas flows into the first container, so When the gas nozzle unit is in the safe state, the high-pressure gas in the first container forces the valve shaft to drive the push pipe to move backward and push the gas tank, so that the gas tank is separated from the gas tank. Magnetic ring without air supply; The safety unit includes a shaft movably installed in the first container; the shaft moves relative to the base unit between a vented position and a non-vented position, and the shaft is in the vented position. In the non-ventilated position, the first through hole is not closed, so that the gas in the first container can flow into the air chamber. When the shaft is in the non-ventilated position, it is subjected to high pressure in the first container The pressure of the gas moves outward, and the first through hole is closed, so that the gas in the first container cannot flow into the gas chamber to interrupt the gas supply. 2 . The safety device for a gas cassette furnace according to claim 1 , wherein when the shaft of the safety unit is in the ventilation position, it communicates with the first container and the first communication hole. 3 . hole. 3 . The safety device for a cassette gas furnace according to claim 2 , wherein the pipe hole extends along the front-rear direction and the valve shaft is blocked when the gas nozzle unit is in the non-inflated state. 4 . When the oblique cone hole is closed, and the air nozzle unit is changed from the uninflated state to the inflated state, the valve shaft cooperates with the push tube to form a gap for gas to pass through, and the air nozzle When the unit is in the safe state, the valve shaft blocks and closes the oblique cone hole portion of the push tube. 4 . The safety device for a cassette gas furnace according to claim 3 , wherein the sleeve extends into the second accommodating groove, and the front ring is arranged on the front side of the inner circumference of the sleeve. 5 . , the rear ring is arranged on the rear side of the inner peripheral surface of the sleeve; when the air nozzle unit changes from the uninflated state to the inflated state, the valve shaft moves forward to compress the push spring , when the air nozzle unit is transformed from the inflated state to the safe state, the push spring releases its elastic force and pushes the valve shaft to move backward, drives the push tube to move backward and compresses the return spring, When the air nozzle unit is changed from the safe state to the non-inflated state, the return spring releases the elastic force and pushes the push tube forward in conjunction with the valve shaft to reset. 5 . The safety device for a cassette gas furnace according to claim 4 , wherein the gas nozzle unit further comprises a plurality of gas seals, and the gas seals are respectively installed between the sleeve and the front ring. 6 . , between the sleeve and the rear ring, between the outer periphery of the push tube and the sleeve, between the rear side of the inner peripheral surface of the push tube, and between the outer periphery of the valve shaft and the push tube. 6 . The safety device for a cassette gas furnace according to claim 2 , wherein the base unit comprises a first plug that is plugged at one end of the first accommodating groove and adjacent to the second through hole. 7 . head, and a second plug head mounted on the other end of the first accommodating groove and extending from the shaft rod, the safety unit further includes a plug head disposed between the shaft rod and the second plug head and having A compression spring with elastic force to reset the shaft after moving, and several rings sleeved on the periphery of the shaft, the shaft has a first end adjacent to the second through hole, and extends out the second end of the second plug, the shaft defines a channel extending from the end face of the first end toward the second end and then radially upwards; the shaft When the rod is in the ventilation position, the passage communicates with the first through hole, and the gas flowing into the first accommodation slot from the second container enters the gas through the passage and the first through hole When the shaft is in the non-ventilated position, the channel is not connected to the first through hole, so that the gas in the first container cannot enter the gas chamber. 7 . The safety device of a cassette gas furnace according to claim 6 , wherein the shaft further defines a slot adjacent to the second end portion and is concavely formed on the outer peripheral surface, and the safety device 7 . It also includes a locking unit for locking and positioning the shaft, the locking unit includes a card plate pivotally pivoted on the base unit, and installed on the base unit and the card There is a torsion spring between the plates and has an elastic force that makes the clamping plate swing toward the shaft; when the shaft is in the ventilation position, the clamping plate abuts on the second end of the shaft and when the shaft rod moves outward to the airtight position, the card plate is swung by the elastic force of the torsion spring and is partially embedded in the groove of the shaft rod for positioning. 8 . The safety device for a cassette gas furnace according to claim 7 , wherein the safety unit further comprises a fixed connection on the end of the shaft extending out of the second plug and located on the card plate. 9 . Outer head. 9 . The safety device for a cassette gas stove according to claim 2 , wherein the base unit comprises a base and a top cover covering the top of the base, and the safety device further comprises a An air valve unit for controlling the communication between the first through hole and the air chamber, the air valve unit includes a valve rod located in the air chamber and pivoted on the base in a swingable manner, a lateral a piston arranged between the base and the top cover and connected to the valve stem at the bottom, and a pressing spring mounted between the center of the piston and the top cover and having an elastic force to push the piston downwards ; The gas entering the air chamber from the first through hole will push the piston and compress the pressing spring, so that the piston drives the valve stem upward to close the first through hole. After the gas output is released, the pressing spring will push the piston and the valve stem to reset. 10 . The safety device for a cassette gas stove according to claim 1 , wherein the base unit further defines a third accommodating groove extending along the front-rear direction and communicating with the gas chamber, and the The safety device further includes a switch unit movably disposed in the third container and used for controlling whether the gas is output to the gas chamber and the flow rate.

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