Pressure relief structure and carbon dioxide fire extinguisher with same

Abstract

The utility model provides a pressure relief structure and a carbon dioxide fire extinguisher with the same, and belongs to the field of fire extinguishers. The pressure relief structure comprises a bottle body, a connecting seat extending upwards is arranged at the top of the bottle body, and a threaded part is arranged on the inner wall of the upper end of the connecting seat, and is characterized by further comprising a plurality of washout structures, each washout structure comprises a special-shaped hole, a blocking cover and a washout piece, and the special-shaped hole is formed in the lower end of the connecting seat and penetrates through the inner wall and the outer wall of the connecting seat and comprises an inner hole and an outer hole which are communicated; the inner end of the inner hole penetrates through the inner wall of the connecting base, the outer end of the outer hole penetrates through the outer wall of the connecting base, the washout part is connected to the inner end of the inner hole in a sealed mode, the blocking cover is fixed to the outer end of the outer hole, when the washout part is subjected to pressure from inside to outside, the washout part has the tendency to break away from the inner hole and enter the outer hole, and when the washout part enters the outer hole, the outer hole, the inner hole and the interior of the bottle body are communicated. The blocking cover is of a hollow ventilation structure. According to the pressure relief structure, safe pressure relief can be achieved under the condition that pressure is suddenly increased, and the bottle body is prevented from exploding.

Description

Technical Field

[0001] The utility model belongs to the field of fire extinguishers and relates to a pressure relief structure and a carbon dioxide fire extinguisher with the pressure relief structure. Background Art

[0002] Carbon dioxide fire extinguishers mainly rely on asphyxiation and partial cooling to extinguish fires. Traditional carbon dioxide fire extinguishers and other fire extinguishers are equipped with safety valves. When the pressure inside the bottle is too high, the safety valve acts as a pressure relief valve. However, in actual cases, fire extinguisher explosions occur from time to time. The main reason is that the pressure of fire extinguisher explosions is generated in a special way. If the pressure inside the bottle increases slowly in the traditional way, the safety valve can play a role in pressure relief, thereby avoiding explosions. However, there are usually accidents in reality, such as the bottle being hit violently, corroded, the flame retardant dry powder and the foaming agent being exposed to high temperatures, and other accidents. The pressure inside the bottle will rise suddenly. At this time, the pressure relief valve will release the pressure slowly or even too late to open, eventually causing the bottle to explode. Therefore, the traditional pressure relief valve is only suitable for situations where the pressure rises slowly or the limit pressure is within a controllable value, and is not applicable to situations where the pressure rises suddenly.

[0003] In order to solve the above problems, this application is proposed. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems existing in the prior art and to provide a pressure relief structure and a carbon dioxide fire extinguisher having the same. The pressure relief structure can achieve safe pressure relief in the event of a sudden increase in pressure to prevent the bottle from exploding, thereby solving the problems that the existing carbon dioxide fire extinguisher relies solely on a safety valve for pressure relief, has narrow applicability, and is difficult to apply to special circumstances.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a pressure relief structure, including a bottle body, the top of the bottle body has a connecting seat extending upward, the inner wall of the upper end of the connecting seat has a threaded portion, and is characterized in that it also includes a plurality of flushing structures, the flushing structure includes a special-shaped hole, a blocking cover and a flushing piece, the special-shaped hole is opened at the lower end of the connecting seat and passes through the inner and outer walls of the connecting seat, the special-shaped hole includes a connected inner hole and an outer hole, the inner end of the inner hole passes through the inner wall of the connecting seat, and the outer end of the outer hole passes through the outer wall of the connecting seat, the flushing piece is sealed and connected to the inner end of the inner hole, and the blocking cover is fixed to the outer end of the outer hole. When the flushing piece is subjected to pressure from the inside to the outside, the flushing piece has a tendency to break away from the inner hole and enter the outer hole, and when the flushing piece enters the outer hole, the outer hole, the inner hole and the inside of the bottle body remain connected, and the blocking cover is a hollow ventilation structure.

[0006] The rest of the structure and function of the bottle body are consistent with the traditional bottle body and will not be elaborated. In this solution, the connecting seat is an extended design, the upper threaded part is used for the matching connection with the connecting pipe, and the lower extended area is for the installation of related structures in the pressure relief structure. The destroyed part will be flushed into the outer hole under the specified pressure. At this time, the pressure in the bottle passes through the inner hole and the outer hole, and finally is released from the baffle. The function of the baffle is to block the destroyed part and prevent the destroyed part from being ejected under high pressure to avoid safety hazards. The opening of the destroyed part in this pressure relief structure requires a pressure value, which varies according to the specifications of the carbon dioxide fire extinguisher. For example, for a carbon dioxide fire extinguisher with a standard pressure value of 5 MPa, the pressure at which the destroyed part is flushed must be greater than 5 MPa, which can be set to 6 MPa, 7 MPa or above. Under normal pressure values, neither the pressure relief structure nor the safety valve will open. When the pressure is within the controllable range of the safety valve, the safety valve will take effect. When the pressure rises rapidly (due to impact, high temperature, corrosion, etc.) and exceeds the critical value, the destruction piece cannot withstand the pressure and is destroyed and quickly enters the outer hole. At this time, the pressure in the bottle is quickly discharged from the baffle. This self-destructive structure will take effect quickly under the critical value, making up for the shortcoming of the slow response of the safety valve, and multiple destruction structures can further play a role in pressure relief. Although the destruction piece in this pressure relief structure cannot be reused after activation, the destruction piece can be reinstalled after removing the connecting pipe connected to the connecting seat. When the number of destruction pieces in the outer hole is small, it does not even need to be removed, and it does not affect the subsequent functions. There is a pressure conduction chamber between the connecting pipe and the destruction piece, so that the pressure in the bottle can have space to be transmitted.

[0007] In the above-mentioned pressure relief structure, the destroyed part is T-shaped as a whole, including a cylindrical connecting column and a limiting plate located at one end of the connecting column, the connecting column is screwed into the inner hole, and a sealing gasket is sleeved on the connecting column, and the sealing gasket is located between the limiting plate and the inner end of the inner hole.

[0008] After the connecting column is screwed, the sealing gasket is used to achieve a sealed connection between the destroyed part and the inner hole. The function of the limit plate is to form a connection seal through the sealing gasket to prevent the leakage of the medium under normal pressure. At the same time, it can achieve self-destruction of the destroyed part under a specified pressure. Self-destruction means that the limit plate breaks under pressure, and the thread of the connecting column is also flushed. After the limit plate breaks, it may fall into the bottle body. Therefore, when the bottle body is refilled, the connecting pipe needs to be removed and the internal limit plate poured out.

[0009] In the above pressure relief structure, the destroyed component is made of alloy steel or carbon steel.

[0010] 40cr material can be selected as the material of the destroyed parts, which has sufficient hardness.

[0011] In the above-mentioned pressure relief structure, the thickness of the limiting plate is not less than 2 mm.

[0012] According to the different specifications of carbon dioxide fire extinguishers, the limit plate has different thicknesses, so that the destroyed parts also have different specifications. The specific situation will not be repeated. The configuration according to needs is a conventional technical means for those skilled in the art.

[0013] In the above-mentioned pressure relief structure, the limit plate has a concave guide groove.

[0014] The guide groove is a ball groove, so that when the pressure in the bottle body is transmitted, it can act on the guide groove to achieve better force application on the limit plate.

[0015] In the above pressure relief structure, the connecting column has a short threaded portion.

[0016] There is a corresponding thread on the inner wall of the inner end of the inner hole, and the thread is generally a tapered thread with excellent sealing performance.

[0017] In the above pressure relief structure, the length of the short threaded portion is smaller than the length of the connecting column.

[0018] An excessively long threaded connection area will significantly increase the connection strength, which may result in the connection strength between the destroyed part and the inner hole being too strong to self-destruct.

[0019] In the above pressure relief structure, the inner diameter and length of the outer hole are both greater than the inner diameter of the inner hole.

[0020] After the thread of the connecting column on the destroyed part is disengaged and the limit plate is broken, the connecting column will impact into the outer hole and fall down. The size relationship between the outer hole and the inner hole enables the connecting column to smoothly enter the outer hole and fall down.

[0021] In the above-mentioned pressure relief structure, the inner wall of the outer end of the outer hole is screwed to the baffle cover.

[0022] The shield can also be fixed by welding, and the screw connection can be easily disassembled to take out the connecting column.

[0023] In the above-mentioned pressure relief structure, the baffle is made of stainless steel.

[0024] In the above pressure relief structure, the outer hole and the inner hole are coaxially arranged.

[0025] The utility model also provides a carbon dioxide fire extinguisher, comprising a handle and an extinguisher head, and also comprising the above-mentioned pressure relief structure.

[0026] The handle and the head have the same structure as those in a conventional carbon dioxide fire extinguisher and are not described in detail. The difference is that the above-mentioned pressure relief structure is applied.

[0027] Compared with the prior art, the pressure relief structure and the carbon dioxide fire extinguisher having the same have the following advantages:

[0028] 1. The pressure relief structure and the carbon dioxide fire extinguisher having the same can realize self-destructive pressure relief quickly in the case of a sudden increase in pressure through the design of the destruction part, prevent the bottle from exploding, and avoid safety hazards to a great extent. It cooperates with the safety valve to realize fast and slow mode pressure relief, and the structural design is ingenious.

[0029] 2. The special-shaped holes in the pressure relief structure and the carbon dioxide fire extinguisher having the same are inner holes and outer holes with different diameters, which are respectively matched with a destruction part and a shield to achieve self-destruction while preventing the destruction part from popping out.

[0030] 3. The pressure relief structure and the multiple destruction structures in the carbon dioxide fire extinguisher having the same can further play a role in pressure relief. Moreover, due to the size relationship between the outer hole and the inner hole, the destroyed parts in the outer hole do not even need to be taken out when the number is small, which greatly facilitates use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural cross-sectional view of a carbon dioxide fire extinguisher having a pressure relief structure according to the present application (partial irrelevant bottle body and connecting pipe are not drawn).

[0032] Figure 2 yes Figure 1 A magnified view of the structure in area A.

[0033] Figure 3 It is a schematic diagram of the structure of the destroyed parts.

[0034] Figure 4 yes Figure 1 A magnified view of the structure in region B.

[0035] List of Reference Numerals

[0036] In the figure, 1. bottle body;

[0037] 1a, connecting seat;

[0038] 1a1, threaded portion;

[0039] 1b, special-shaped holes;

[0040] 1b1, inner hole;

[0041] 1b2, external hole;

[0042] 2. Shield;

[0043] 3. Destroyed parts;

[0044] 3a, connecting column;

[0045] 3a1, short thread portion;

[0046] 3b, limit plate;

[0047] 3b1, guide groove;

[0048] 3c, sealing gasket;

[0049] 4. Handle;

[0050] 5. Instrument head. DETAILED DESCRIPTION

[0051] like Figures 1 to 4 As shown, the pressure relief structure includes a bottle body 1, the top of the bottle body 1 has a connecting seat 1a extending upward, the inner wall of the upper end of the connecting seat 1a has a threaded portion 1a1, and also includes a plurality of flushing structures, the flushing structure includes a special-shaped hole 1b, a shield 2 and a flushing member 3, the special-shaped hole 1b is opened at the lower end of the connecting seat 1a and passes through the inner and outer walls of the connecting seat 1a, the special-shaped hole 1b includes a connected inner hole 1b1 and an outer hole 1b2, the inner end of the inner hole 1b1 passes through the inner wall of the connecting seat 1a, and the outer end of the outer hole 1b2 passes through the outer wall of the connecting seat 1a, the flushing member 3 is sealed and connected to the inner end of the inner hole 1b1, and the shield 2 is fixed to the outer end of the outer hole 1b2. When the flushing member 3 is subjected to pressure from the inside to the outside, the flushing member 3 has a tendency to break away from the inner hole 1b1 and enter the outer hole 1b2, and when the flushing member 3 enters the outer hole 1b2, the outer hole 1b2, the inner hole 1b1 and the inside of the bottle body 1 remain connected, and the shield 2 is a hollow ventilation structure. The rest of the structure and function of the bottle body 1 are consistent with the traditional bottle body 1 and will not be elaborated. In this solution, the connecting seat 1a is of an extended design, and the upper threaded portion 1a1 is used for matching connection with the connecting pipe, and the lower extended area is for realizing the installation of related structures in the pressure relief structure. The destroying part 3 will be flushed into the outer hole 1b2 under the specified pressure. At this time, the pressure in the bottle passes through the inner hole 1b1 and the outer hole 1b2, and finally is released from the shield 2. The function of the shield 2 is to block the destroying part 3 and prevent the destroying part 3 from being ejected under high pressure to avoid safety hazards. The opening of the destroying part 3 in this pressure relief structure requires a pressure value, and this value varies according to the specifications of the carbon dioxide fire extinguisher. For example, for a carbon dioxide fire extinguisher with a standard pressure value of 5 MPa, the pressure at which the destroying part 3 is flushed is 7 MPa. Under normal pressure values, neither the pressure relief structure nor the safety valve will open. When the pressure is within the controllable range of the safety valve, the safety valve will take effect. When the pressure rises rapidly and exceeds the critical value, the destroying part 3 cannot withstand the pressure and is destroyed and quickly enters the outer hole 1b2. At this time, the pressure in the bottle body 1 is quickly discharged from the baffle 2. This self-destructive structure will take effect quickly under the critical value, making up for the shortcoming of the slow response of the safety valve, and multiple destroying structures can further play a role in pressure relief. Although the destroying part 3 in this pressure relief structure cannot be reused after activation, the destroying part 3 can be reinstalled after removing the connecting pipe connected to the connecting seat 1a. When the number of the destroying parts 3 in the outer hole 1b2 is small, it does not even need to be removed, and it does not affect the subsequent functions. There is a pressure transmission chamber between the connecting pipe and the destroying part 3, so that the pressure in the bottle body 1 can have space to be transmitted.

[0052] The overall shape of the destroyed part 3 is T-shaped, including a cylindrical connecting column 3a and a limiting plate 3b located at one end of the connecting column 3a. The connecting column 3a is screwed into the inner hole 1b1. A sealing gasket 3c is sleeved on the connecting column 3a. The sealing gasket 3c is located between the limiting plate 3b and the inner end of the inner hole 1b1. After the connecting column 3a is screwed, the sealing gasket 3c is used to realize the sealed connection between the destroyed part 3 and the inner hole 1b1. The function of the limiting plate 3b is to form a connection seal through the sealing gasket 3c to prevent the leakage of the medium under normal pressure. At the same time, the destroyed part 3 can realize self-destruction under a specified pressure. Self-destruction means that the limiting plate 3b breaks under pressure, and the thread of the connecting column 3a is also opened. The destroyed part 3 uses 40cr material as the material of the destroyed part 3, which has sufficient hardness. The thickness of the limiting plate 3b is 2.5mm. According to the different specifications of carbon dioxide fire extinguishers, the limit plate 3b has different thicknesses, so that the destruction part 3 also has different specifications. The specific situation will not be repeated. Configuration on demand is a conventional technical means for those skilled in the art. There is a recessed guide groove 3b1 on the limit plate 3b. The guide groove 3b1 is a ball groove, so that when the pressure in the bottle body 1 is transmitted, it can act on the guide groove 3b1 to achieve better force application on the limit plate 3b. There is a short threaded portion 3a1 on the connecting column 3a. There is a corresponding thread on the inner wall of the inner end of the inner hole 1b1, and the thread is generally a tapered thread with excellent sealing performance. The length of the short threaded portion 3a1 is less than the length of the connecting column 3a. An excessively long threaded connection area will greatly increase the connection strength, which may make the connection strength between the destruction part 3 and the inner hole 1b1 so large that it cannot self-destruct. The inner diameter and length of the outer hole 1b2 are both larger than the inner diameter of the inner hole 1b1. After the thread of the connecting column 3a on the destroyed part 3 is disengaged and the limit plate 3b is broken, the connecting column 3a will impact the outer hole 1b2 and fall down. The size relationship between the outer hole 1b2 and the inner hole 1b1 can realize that the connecting column 3a can smoothly enter the outer hole 1b2 and fall down. The inner wall of the outer end of the outer hole 1b2 is screwed to the shield 2. The shield 2 can also be fixed by welding, and the screw connection can be easily removed to take out the connecting column 3a. The shield 2 is made of stainless steel. The outer hole 1b2 and the inner hole 1b1 are coaxially arranged.

[0053] A carbon dioxide fire extinguisher is also provided, comprising the above pressure relief structure, and also comprising a handle 4 and a head 5. The handle 4 and the head 5 are the same as those in a conventional carbon dioxide fire extinguisher, and are not described in detail, except that the above pressure relief structure is applied.

[0054] The detailed structures, specific component sizes and principles not mentioned in the present application documents are all common knowledge or can be obtained by those skilled in the art through simple selection, and will not be elaborated on.

[0055] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A pressure relief structure, comprising a bottle body, wherein the top of the bottle body has a connection seat extending upward, and the inner wall of the upper end of the connection seat has a threaded portion, characterized in that: It also includes a number of flushing structures, which include a special-shaped hole, a blocking cover and a flushing piece. The special-shaped hole is opened at the lower end of the connecting seat and passes through the inner and outer walls of the connecting seat. The special-shaped hole includes a connected inner hole and an outer hole. The inner end of the inner hole passes through the inner wall of the connecting seat, and the outer end of the outer hole passes through the outer wall of the connecting seat. The flushing piece is sealed and connected to the inner end of the inner hole, and the blocking cover is fixed to the outer end of the outer hole. When the flushing piece is subjected to pressure from the inside to the outside, the flushing piece has a tendency to break away from the inner hole and enter the outer hole, and when the flushing piece enters the outer hole, the outer hole, the inner hole and the inside of the bottle body remain connected, and the blocking cover is a hollow ventilation structure.

2. The pressure relief structure according to claim 1, characterized in that The destroyed part is T-shaped as a whole, including a cylindrical connecting column and a limiting plate located at one end of the connecting column. The connecting column is screwed into the inner hole. A sealing gasket is sleeved on the connecting column, and the sealing gasket is located between the limiting plate and the inner end of the inner hole.

3. The pressure relief structure according to claim 1, characterized in that: The destroyed part is made of alloy steel or carbon steel.

4. The pressure relief structure according to claim 2, characterized in that: The thickness of the limiting plate is not less than 2 mm.

5. The pressure relief structure according to claim 2, characterized in that: The limiting plate is provided with a concave guide groove.

6. The pressure relief structure according to claim 2, characterized in that: The connecting column is provided with a short threaded portion.

7. The pressure relief structure according to claim 6, characterized in that: The length of the short threaded portion is smaller than the length of the connecting column.

8. The pressure relief structure according to claim 1, characterized in that: The inner diameter and length of the outer hole are both greater than the inner diameter of the inner hole.

9. The pressure relief structure according to claim 1, characterized in that: The inner wall of the outer end of the outer hole is screwed to the blocking cover.

10. A carbon dioxide fire extinguisher, comprising a handle and a head, characterized in that: It also includes the pressure relief structure described in any one of claims 1-9.

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