Flame-retardant device and oxygen generator with flame-retardant function

Abstract

The application is suitable for the field of oxygen generator accessories, and provides a fireproof device and an oxygen generator with a fireproof function. The fireproof device comprises: an air inlet end; an air outlet end, which forms an air flow passage with a containing space with the air inlet end; and a fireproof assembly, which comprises: a blocking piece arranged in the containing space, the blocking piece being arranged on the side facing the air inlet end and forming a cooperation with the containing space to block the air flow passage; the side of the blocking piece facing the air outlet end is provided with an extension, and the end of the extension extends to the air outlet of the air outlet end; a triggering part is arranged at the end of the extension and forms a cooperation with the air outlet to leave an air outlet space, the triggering part is made of a heat deformable material; and a force applying part is used to apply a force to the blocking piece towards the air inlet end, the triggering part has a tendency to move inwardly under the traction of the force and is blocked by the end of the air outlet. In the application, the triggering part is located outside the air outlet, is more sensitive to fire triggering, and moves inwardly after the triggering part is melted, so that the probability of being stuck is extremely low, and the triggering efficiency is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oxygen generator accessories, and particularly relates to a fireproof device and an oxygen generator with a fireproof function. BACKGROUND

[0002] With the continuous improvement of living standards and medical equipment technology, oxygen generators as auxiliary breathing equipment have been widely applied to medical institutions and ordinary families. At present, the application scenarios of oxygen generators are gradually expanding. Not only people with respiratory system diseases or cardiovascular and cerebrovascular diseases will use oxygen generators, but also some ordinary people who use their brains more will use oxygen generators to promote blood circulation and relax the brain.

[0003] Because of the rapid promotion of oxygen generating equipment and its popularity in many non-professional medical use scenarios, in addition, oxygen is a combustion-supporting gas, and if it encounters an open flame, it can easily increase the fire and cause a serious fire. Therefore, how to quickly stop the oxygen generator from delivering oxygen when encountering an open flame is crucial.

[0004] In summary, there is an urgent need for a solution that can quickly cut off the oxygen generator from delivering oxygen to the outside when encountering an open flame. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a fireproof device, which aims to solve the problem of how to quickly cut off the oxygen generator from delivering oxygen to the outside when encountering an open flame.

[0006] The embodiments of the present application are implemented as follows: a fireproof device, comprising:

[0007] an air inlet end;

[0008] an air outlet end, the air inlet end and the air outlet end form an airflow passage with a containing space inside; and

[0009] a fireproof assembly, the fireproof assembly comprises:

[0010] a blocking piece arranged in the containing space, the blocking piece on the side facing the air inlet end forms a cooperation with the containing space to block the airflow passage; the blocking piece on the side facing the air outlet end is provided with an extension, and the end of the extension extends to the air outlet of the air outlet end;

[0011] a trigger part arranged at the end of the extension and forming a cooperation with the air outlet to leave an air outlet space, the trigger part is a heat deformable material; and

[0012] a force applying part for applying a force to the blocking piece towards the air inlet end, the trigger part has a tendency to move inwardly under the traction and is blocked by the end of the air outlet.

[0013] Another object of the present application is to provide an oxygen generator with a fire-retardant function, which comprises:

[0014] an oxygen generator main body; and

[0015] The fire-retardant device as described above is connected to the air outlet of the oxygen generator main body.

[0016] The fire-retardant device provided by the present application comprises a force applying part, a blocking part, an extending part, and a triggering part, which form a fireproof assembly. When the triggering part is heated and deformed by fire, it can be separated from the air outlet end face. The force applying part then pulls the blocking part, which is no longer constrained, to move towards the air inlet end until it blocks the oxygen flow channel. In the present application, the triggering part is directly exposed to the air outlet. When it encounters fire, it can directly and fully contact the flame and be deformed more quickly. Moreover, the cooperation mode is simple, the manufacturing is convenient, the probability of being stuck after triggering is low, the probability of successful triggering and oxygen interruption is very high, and the safety of the oxygen generator is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 4 is a longitudinal sectional view of the fire-retardant device provided by the present application when the triggering part is not fused;

[0018] Figure 2 FIG. 5 is an end face view of the air outlet end of the fire-retardant device provided by the present application when the triggering part is not fused;

[0019] Figure 3 FIG. 6 is a longitudinal sectional view of the fire-retardant device provided by the present application when the triggering part is fused;

[0020] Figure 4 FIG. 7 is a distribution diagram of the avoiding grooves of the inner wall of the air outlet end of the fire-retardant device provided by the present application;

[0021] Figure 5 FIG. 8 is an end face view of the air outlet end of another fire-retardant device provided by the present application when the triggering part is not fused;

[0022] Figure 6 FIG. 9 is a setting diagram of a limiting groove of the fire-retardant device provided by the present application. IMPLEMENTATION

[0023] In order to make the objects, technical solutions, and advantages of the present application clearer, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0024] The specific implementation of the present application is described in detail below with reference to specific embodiments.

[0025] AsFigures 1-6 Fig. 1 shows a structural diagram of a fireproof device according to an embodiment of the present application, which comprises:

[0026] an air inlet end 100;

[0027] an air outlet end 200, the air inlet end 100 and the air outlet end 200 form an airflow passage with a containing space 300 inside; and

[0028] a fireproof assembly, which comprises:

[0029] a blocking member 410 arranged in the containing space 300, the blocking member 410 forms a fit with the containing space 300 towards the air inlet end side, which can block the airflow passage; the blocking member 410 is provided with an extension 420 towards the air outlet end side, the end of the extension 420 extends towards the air outlet 210 of the air outlet end 200;

[0030] a triggering part 430 arranged at the end of the extension 420, which forms a fit with the air outlet 210 leaving an air outlet space, the triggering part and / or the air outlet part forming the fit are made of heat deformable material; and

[0031] a force applying part 440 for applying a force to the blocking member 410 towards the air inlet end, the triggering part 430 has a tendency to move inwards due to the traction and is blocked by the end of the air outlet 210.

[0032] In the embodiment of the present application, in the normal use state, the heat deformable triggering part and / or the air outlet form a pressing fit, specifically, the force applied by the force applying part 440 to the blocking member 410 is transmitted to the triggering part 430 through the extension, the triggering part 430 is pressed against the end face of the air outlet 210 or the fit structure arranged on the end face of the air outlet 210 due to the inward (i.e. towards the air inlet end) force. The triggering part 430 and / or the part or structure cooperating with the triggering part 430 at the air outlet are made of heat deformable material, when the fire spreads to the air outlet 210, the triggering part 430 and / or the air outlet part only needs to be slightly deformed by heat, which will cause the triggering part 430 to be separated from the blocking of the air outlet 210, at this time, the blocking member 410 is no longer restricted and is pushed to the air inlet end side under the action of the force applying part 440, thereby blocking the airflow passage of the containing space 300 on this side and preventing the further output of oxygen, which avoids the further expansion of the fire.

[0033] In the embodiment of the present application, the triggering part 430 can be directly exposed to the outside from the air outlet 210, which can be deformed by heat more directly and more quickly compared with the arrangement mode hidden in the air outlet end, thereby blocking the output of oxygen, and therefore, the sensitivity of triggering is higher.

[0034] In addition, after the trigger portion 430 is disengaged from the air outlet 210, it is pulled to move inward, thereby blocking the air flow passage at the air inlet end. The advantage of this arrangement is that, as long as the trigger portion 430 and / or the air outlet are slightly deformed by heat, the trigger portion 430 can disengage from the air outlet 210, and during the subsequent movement of the trigger portion 430, there is no intersection or interference with the components at the air outlet. The success rate of triggering is extremely high. In the outward pushing triggering mode, even if the initial pressing state is easily removed after the trigger portion and the air outlet are heated, the trigger portion may not be able to be successfully pushed outward. Because the deformed state of the trigger portion and the air outlet after being heated is unpredictable, the structure of the trigger portion and the air outlet cannot be deformed very regularly in the ideal state. Therefore, as long as the material is unevenly deformed by heat, the trigger portion may not be able to be pushed out in a straight line in the air outlet direction. If the trigger portion or the extension portion is disturbed and deviated, the trigger portion will be stuck in the air outlet, the blocking member cannot be moved to the right position, and the oxygen blocking will fail.

[0035] As an embodiment of the present application, the trigger portion 430 and / or the cooperating structure at the air outlet are made of heat-deformable material. The heat-deformable material is generally made of combustible material, which can be burned by heat or open flame, thereby deforming or melting, and then making the trigger portion 430 quickly disengage from the air outlet under the pulling force of the internal force applying portion 440, so that the blocking member 410 can break free and block the oxygen passage. Of course, the air inlet end 430 is generally made of flame-retardant material, but some combustible material can be arranged at the air outlet of the air inlet end to cooperate with the trigger portion 430.

[0036] As an embodiment of the present application, it can be understood that the extension portion 420 and the air flow passage of the air outlet end 200 leave a space for gas to pass freely. Similarly, the trigger portion 430 also leaves an air outlet space at the air outlet end, and does not completely block the air outlet. Generally, the trigger portion 430 is arranged as a linear rod and is lapped at the air outlet end.

[0037] As an embodiment of the present application, the air inlet end 100 and the air outlet end 200 are both structures with air nozzles and internal cavities. After being connected, the internal cavities are connected to each other to form an air flow passage, and a larger accommodating space 300 is formed at the middle position of the air flow passage.

[0038] In the embodiment, the blocking member 410 is provided with a first fitting surface 411 on the side facing the air inlet end; the air inlet end 100 is provided with a second fitting surface 120 that matches the first fitting surface 411, and the middle part of the second fitting surface 120 is a gas flow passage leading to the air inlet of the air inlet end. Optionally, the first fitting surface 411 is a tapered surface or an arc surface, and the shape of the second fitting surface matches it. Optionally, the end of the first fitting surface 411 is provided with a guide rod 413 that extends into the gas flow passage inside the air inlet end, so that when the blocking member 410 triggers the blocking action, it can smoothly approach and fit the second fitting surface 120. Further, as shown in Figure 1 the sealing material 412 is provided on the first fitting surface 411 and / or the second fitting surface 120, which is a sealing ring or other sealing member. When the two surfaces are fitted, the sealing material 412 blocks the gas flow passage.

[0039] In one case, the gas nozzle of the air inlet end 100 corresponds to the air inlet, and from the air inlet to the inside is a variable-diameter gas flow passage with gradually increasing inner diameter, which extends inwardly to the small end of the second fitting surface 120. The gas nozzle of the air outlet end 200 corresponds to the air outlet, and from the air outlet to the inside is the gas flow passage of the air outlet end, which has a larger pipe diameter on the side close to the air inlet end for forming the above-mentioned accommodating space 300.

[0040] In one case, the air inlet end 100 and the air outlet end 200 are connected by a snap connection or a threaded connection. Preferably, the air inlet end 100 and the air outlet end 200 are connected by a threaded connection, one of them is provided with external threads on the outer pipe wall of the connection side, and the other is provided with internal threads on the inner pipe wall of the connection side that match the external threads, Figure 1 , 3 In the example structure, the external threads are provided on the air inlet end 100, and the internal threads are provided on the air outlet end 200. The air inlet end is further provided with a limiting flange 130 in the middle part for limiting the depth of the air outlet end 200 screwed on the air inlet end 100. In addition, a sealing ring 110 is provided between the connection surface of the air inlet end 100 and the air outlet end 200, Figure 1 , 3 In the example structure, the sealing ring 110 is provided on the outer pipe surface of the air inlet end 100 close to the air outlet end 200, so that the internal space of the air inlet end 100 and the air outlet end 200 forms a sealed space (except for the air inlet and the air outlet).

[0041] In one case, the force applying part 440 is an elastic element and / or a magnetic force element provided between the blocking member 410 and the accommodating space 300. Optionally, the elastic element can be a spring, a spring sheet or other element that can generate elastic force. Figure 1 , 3The spring is sleeved on the root of the extending part 420, and one end is abutted against the blocking part 410, and the other end is abutted against the stepped surface formed by the expansion of the airflow passage inside the air outlet end 200. In addition, the diameter of the root of the extending part 420 is larger than the diameter of the part extending into the airflow passage of the air inlet end (but not larger than the inner diameter of the airflow passage inside the air outlet end to avoid affecting the installation), so as to better adapt to the spring.

[0042] Alternatively, the magnetic force element can also be two groups of repelling magnets, one group is arranged on the stepped surface formed by the expansion of the airflow passage inside the air outlet end 200, and the other group is arranged on the blocking part, and the two groups form repulsion. The magnetic force element can also be two groups of magnetic attraction materials, one group is arranged on the first abutting surface 411, and the other group is arranged on the second abutting surface 310; the magnetic attraction materials are arranged in an embedded manner on the two abutting surfaces, or the two abutting surfaces are directly made of the magnetic attraction materials.

[0043] Preferably, the force applying part can also be a combination of a magnetic force element and an elastic element, for example, containing two groups of magnetic attraction magnets, one group is arranged on the first abutting surface 411, and the other group is arranged on the second abutting surface 310. At the same time, it also contains a group of elastic elements, one end of the elastic element is abutted against the side of the blocking part 410 close to the air outlet end, and the other end is abutted against the stepped surface formed by the expansion of the airflow passage inside the air outlet end 200; the two elements work together to enhance the traction of the force applying part 440.

[0044] As an embodiment of the present application, the trigger part 430 is integrally formed with the extending part 420, or is detachably connected; wherein, in the case that the trigger part 430 is integrally formed with the extending part 420, the trigger part 430 and the extending part 420 can be integrally formed of the same material; of course, two different materials can also be used to integrally manufacture through the forming process, so that the trigger part 430 can be made of flammable and heat deformable material, and the extending part 420 can be made of flame retardant material.

[0045] In the embodiment, the trigger portion 430 has an abutting portion with a diameter greater than that of the gas outlet cross section; specifically, in the normal state, the trigger portion 430 needs to be stably abutted against the gas outlet end portion, so that the internal blocking member 410 is kept in a force-bearing state at all times, and therefore the trigger portion 430 needs to be prevented from being separated from the gas outlet end portion under the action of the pulling force applied by the force applying portion 440 via the extension portion 420; this requires the trigger portion 430 to have a portion with a size greater than that of the gas outlet cross section, and the portion of the trigger portion abutting against the gas outlet end portion is defined as the abutting portion. Generally, the trigger portion 430 is provided in the form of a linear rod, and the abutting portion 430 is the linear rod itself, as long as the length of the linear rod is greater than the cross section diameter of the gas outlet end portion; in other cases, the trigger portion 430 can also be provided in other shapes, as long as it has an abutting portion with a diameter greater than that of the gas outlet cross section, and the abutting portion can leave a gas outlet space when it abuts against the gas outlet end portion. It can be understood that the overall shape of the trigger portion 430 has a size in the direction of the gas outlet cross section that is smaller than the outer diameter of the gas outlet, so as to avoid interference of the trigger portion with the connection between the gas outlet and the gas using equipment.

[0046] As shown in Figure 2 , the gas flow passage inside the gas outlet end portion 200 is provided with a recess 220 for the abutting portion to pass through, and the recess 220 extends to the end portion of the gas outlet. When the trigger portion 430 is integrally formed with the extension portion 420, or the trigger portion 430 is detachably connected with the extension portion 420 but is mounted into the gas outlet end portion 200 in the order of connection and then mounting, it is necessary to provide the recess 220 with a size suitable for the trigger portion / abutting portion to pass through inside the gas outlet end portion.

[0047] Optionally, the extension trajectory of the recess 220 on the wall of the gas flow passage inside the gas outlet end portion is a linear recess, which is the most direct setting mode, and is simple to process and install, and the abutting portion can be easily pushed along the linear recess from the inside of the gas outlet end portion to the end portion of the gas outlet.

[0048] Optionally, the extension trajectory of the recess 220 on the wall of the gas flow passage inside the gas outlet end portion is a spiral line type recess, i.e. the distribution trajectory of the recess 220 on the inner wall of the gas outlet end portion is in the form of a spiral line, and the abutting portion needs to be spirally pushed from the inside of the gas outlet end portion to the end portion of the gas outlet during installation. The advantage of this setting mode is that, when the trigger portion 430 is separated from the gas outlet due to some non-thermal deformation reasons, it can be clamped on the spiral line recess due to the friction force between the components, thereby avoiding direct blocking of the gas outlet; at the same time, the spiral line type recess is more uniformly arranged in the circumferential direction of the inner wall of the gas outlet end portion, so as to avoid excessively low overall structural strength.

[0049] Optionally, as shown in Figure 4As shown, the avoidance groove 220 extends on the inner wall of the air outlet end from the side close to the air inlet end to the air outlet direction, and extends to a set distance close to the air outlet 210, then bends along the circumferential direction of the inner wall of the air outlet end and extends for a set length, and then bends to the air outlet direction and extends to the end of the air outlet. This setting mode actually sets a stepped bending of the avoidance groove 220 close to the air outlet, which can more effectively avoid the situation that the triggering part 430 is separated from the air outlet due to some non-thermal deformation reasons. During installation, the abutting part is pushed to the air outlet from the inside, and when passing through the step, it is twisted; in order to facilitate installation, the bending part can be transitioned through a circular arc. The above-mentioned set distance and set length are selected according to the actual situation, as long as a step that prevents separation can be formed.

[0050] As an embodiment of the present application, as shown in Figure 2 As shown, the end of the air outlet 210 is also provided with a limiting groove 211, which can limit the rotation of the triggering part 430 when the triggering part 430 is embedded in the limiting groove 211. Specifically, when the triggering part 430 passes through the avoidance groove 220 to the outside of the air outlet, it can be lapped on the end face of the air outlet by twisting an angle, but if it is directly lapped, it is easy to twist back to the position of the avoidance groove 220 due to various reasons. Therefore, in order to avoid this situation, it is necessary to set the limiting groove 211 on the end face of the air outlet to cooperate with the triggering part 430.

[0051] In one case, the depth of the limiting groove 211 is set so that when the triggering part 430 is placed in the limiting groove 211, the end of the triggering part 430 does not exceed the end face of the air outlet. It can be understood that the depth of the limiting groove 211 is greater than the thickness of the triggering part 430 in the air outlet direction, so that after the triggering part 430 is embedded in the limiting groove 211, it can be completely immersed therein, avoiding the triggering part 430 protruding and affecting the docking use of the flame retardant device.

[0052] As an embodiment of the present application, the shape of the triggering part 430 is not limited in principle, as long as it does not affect the airflow passing through and can cooperate with the force applying part to abut on the end of the air outlet in the normal state. However, when considering the convenience of product manufacturing and installation and other factors, a simple structure such as a strip type is preferred.

[0053] In one case, when the trigger portion 430 is arranged in a strip shape, the limiting groove 211 is a sunken groove whose position is staggered with the position of the avoiding groove 220. That is, the trigger portion 430 is in the most common strip shape, the limiting groove 211 is a sunken groove staggered with the avoiding groove 220 by a proper angle, which can be 90 degrees in general, and is both beautiful and practical. Preferably, when the trigger portion 430 is arranged in a strip shape and the trigger portion and the extending portion are integrally formed, the connection between the abutting portion of the trigger portion and the extending portion can be arranged as an arc-shaped transition curved surface, so as to reduce the strength reduction of the trigger portion caused by stress concentration.

[0054] In another case, when the trigger portion 430 is arranged in a shape with one end large and the other end small along the cross section perpendicular to the air outlet direction, the avoiding groove 220 includes a first avoiding groove 221 for passing through the large end of the trigger portion and a second avoiding groove 222 for passing through the small end of the trigger portion; the limiting groove 211 is a sunken groove whose position is staggered with the position of the avoiding groove 220, or, as shown in Figure 5 、 6 the limiting groove 211 is a stepped groove formed by the second avoiding groove 222 at the air outlet end surface for limiting (restricting rotation) the large end of the trigger portion, and the width of the second avoiding groove 222 is smaller than the width of the large end of the trigger portion. It can be understood that the projection of the limiting groove 211 in the air outlet direction in this case overlaps with the second avoiding groove 222 and has a larger width, the large end of the trigger portion is limited, and the small end of the trigger portion is just suspended in the first avoiding groove 221. In this case, only the large end of the trigger portion 430 abuts against the limiting groove 211, and the deformation response after being heated is more sensitive; and this structure can avoid the air outlet end being processed with more grooves, which reduces the structural strength of the air outlet end. When this structure is adopted, after the trigger portion passes through the avoiding groove, the large end of the trigger portion is embedded on the stepped limiting groove outside the second avoiding groove 222 only by rotating 180 degrees.

[0055] As an embodiment of the present application, the trigger portion 430 and the extending portion 420 are detachably connected, and the trigger portion 430 and the extending portion 420 can be connected after the extending portion passes through the air outlet, in which case the avoiding groove 220 can not be arranged on the inner wall of the air outlet end. Of course, according to the need, the avoiding groove 220 can still be arranged on the inner wall of the air outlet end, and the trigger portion 430 and the extending portion 420 can be assembled together first and then pushed to the air outlet through the avoiding groove 220.

[0056] In one case, one way of detachable connection is screw connection. For example, a threaded rod is arranged inside the trigger part, and a threaded sleeve matching the threaded rod is arranged on the extension part; or a threaded hole is arranged in the middle of the trigger part, and a screw rod matching the threaded hole is arranged at the end of the extension part.

[0057] In one case, another way of detachable connection is buckle. For example, a buckle is arranged in the middle of the trigger part, and a clamping section is arranged at the end of the trigger part, which can be clamped into the buckle and form a retreat-stop connection, similar to the connection of a cable tie.

[0058] As an embodiment of the present application, the trigger part 430 and the end of the air outlet can also be connected in a detachable manner. In one case, the specific detachable connection is that the end of the air outlet is provided with a pin shaft, and the trigger part 430 is in the form of a clamping hook or a ring sleeve, which is hooked on the pin shaft in the form of a clamping hook or sleeved on the pin shaft in the form of a ring sleeve. It can be understood that a mounting hole is arranged on the side wall of the air outlet end for assembling the pin shaft.

[0059] In the above embodiments of the present application, the fireproof assembly is composed of the force applying part, the blocking part, the extension part, and the trigger part. When the trigger part is heated and deformed by fire and can be detached inward from the end face of the air outlet, the force applying part pulls the blocking part, which is released from the constraint, to move towards the air inlet end until it blocks the airflow passage of the output oxygen; in the present application, the trigger part is directly exposed to the air outlet, and when it encounters fire, it can directly contact the flame and deform more quickly; moreover, the cooperation mode is simple, the manufacturing is convenient, the probability of being stuck after triggering is low, the probability of successful triggering and oxygen cutting is very high, and the safety of the oxygen generator is greatly improved.

[0060] In one embodiment of the present application, an oxygen generator with a fireproof function is also provided, which comprises:

[0061] an oxygen generator main body; and

[0062] the fireproof device of any one of the above embodiments is connected to the air outlet of the oxygen generator main body.

[0063] In the present embodiment, the air inlet end of the fireproof device is connected to the air outlet of the oxygen generator main body, and the air outlet end of the fireproof device is connected to the gas using equipment. By arranging the fireproof device provided in the above embodiments, when an open flame appears on the gas using equipment or around, and the flame spreads to the fireproof device, the fireproof device can quickly cut off the oxygen passage, which can greatly improve the safety of the oxygen generator. In addition, the trigger part of the fireproof device is located outside the air outlet, which is more sensitive to triggering when encountering fire, and the trigger part moves inward after melting, which has a very low probability of being stuck, and has a high triggering efficiency.

[0064] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flame-retardant device, characterized in that, include: Intake end; The air outlet end and the air inlet end form an airflow passage with a accommodating space inside; as well as Fireproof components, the fireproof components include: An obstruction member is disposed within the accommodating space, wherein the obstruction member on the side facing the air inlet end forms a cooperation with the accommodating space to block the airflow passage; the obstruction member on the side facing the air outlet end has an extension portion, the end of which extends toward the air outlet of the air outlet end. A trigger portion, located at the end of the extension portion, and forming a space for air outlet with the air outlet; the trigger portion is made of a heat-deformable material; and The force-applying part is used to apply a force toward the air inlet end to the blocking member, and the trigger part is pulled inward and is blocked by the end of the air outlet. The trigger portion and the extension portion are integrally formed or detachably connected; The trigger part has an abutting part that is larger than the inner diameter of the air outlet cross-section, and the overall shape of the trigger part is smaller than the outer diameter of the air outlet in the cross-sectional direction of the air outlet. The airflow channel inside the air outlet is provided with a clearance groove for the passage of the abutment part, and the clearance groove extends to the end of the air outlet. The end of the air outlet is also provided with a limiting groove. When the trigger part is embedded in the limiting groove, the limiting groove can restrict the rotation of the trigger part. The trigger part has a cross-sectional shape that is larger at one end and smaller at the other along the direction perpendicular to the air outlet. The clearance groove includes a first clearance groove for passing through the large end of the trigger part and a second clearance groove for passing through the small end of the trigger part. The limiting groove is a stepped groove formed by the second clearance groove on the end face of the air outlet for limiting the large end of the trigger part. The width of the second clearance groove is smaller than the width of the large end of the trigger part.

2. The flame-retardant device according to claim 1, characterized in that, The depth of the limiting groove is set such that when the trigger part is placed into the limiting groove, the end of the trigger part does not extend beyond the end face of the air outlet.

3. The flame-retardant device according to claim 1, characterized in that, The blocking component has a first contact surface on the side facing the air intake end; the air intake end has a second contact surface that fits with the first contact surface, and the middle part of the second contact surface is an airflow channel leading to the air intake end; a sealing material is provided on the first contact surface and / or the second contact surface.

4. The flame-retardant device according to claim 1, characterized in that, The force-applying part is: An elastic element or a magnetic element, or a combination of both, is disposed between the blocking element and the receiving space.

5. An oxygen generator with flame-retardant function, characterized in that, The oxygen generator includes: The main body of the oxygen concentrator; and The flame-retardant device as described in any one of claims 1 to 4, wherein the flame-retardant device is connected to the air outlet of the oxygen generator body.

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