CN213956669U - Bottled high-pressure heptafluoropropane fire extinguishing agent leakage amount real-time detection device - Google Patents
Bottled high-pressure heptafluoropropane fire extinguishing agent leakage amount real-time detection device Download PDFInfo
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- CN213956669U CN213956669U CN202022924990.1U CN202022924990U CN213956669U CN 213956669 U CN213956669 U CN 213956669U CN 202022924990 U CN202022924990 U CN 202022924990U CN 213956669 U CN213956669 U CN 213956669U
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Abstract
The utility model discloses a real-time detection device for leakage of bottled high-pressure heptafluoropropane fire extinguishing agent, which comprises a measurement cavity and a vacuum fixed cavity, wherein the measurement cavity is installed on a bottle body to be measured and is formed by closing a measurement cavity left shell and a measurement cavity right shell, and the vacuum fixed cavity is formed by closing a vacuum fixed cavity left shell and a vacuum fixed cavity right shell; the measurement cavity left shell and the measurement cavity right shell and the vacuum fixed cavity left shell and the vacuum fixed cavity right shell are connected and closed through a shell fixing component. The vacuum air pump respectively vacuumizes the measuring cavity and the vacuum fixing cavity by connecting the first interface and the second interface, and the vacuum fixing cavity and the external environment form pressure difference to be connected to the measuring bottle body in an adsorption mode. The utility model discloses normally realize under the condition of its function at bottled high-pressure heptafluoropropane, can collect its small leakage quantity and leak the quantity to its accumulation and carry out quantitative measurement to its small leakage quantity for a long time, measurement accuracy is high, and installs and easy and simple to handle.
Description
Technical Field
The utility model relates to a bottle leak testing device especially relates to a leakage quantity real-time detection device is let out to bottled high pressure heptafluoropropane fire extinguishing agent.
Background
Heptafluoropropane has been used as a clean and efficient gas fire extinguishing agent in important and critical places such as communication rooms, computer rooms, generator rooms, power distribution rooms and precision instrument and equipment rooms. At present, heptafluoropropane is mostly adopted as a fire extinguishing agent in signal control rooms widely distributed along high-speed rails in China, and the signal control rooms are used as control brains for high-speed rail system operation, so that the performance guarantee of the fire extinguishing system in the signal control rooms has important significance for the safe operation of the whole high-speed rail system. At normal temperature, heptafluoropropane is generally bottled for storage in a liquid form, and the pressure in the bottle is 2.5-4 MPa. In practical engineering application, the connecting parts such as valves of heptafluoropropane high-pressure storage bottles and tanks are easy to leak slowly, so that the leakage detection and monitoring technology of bottled high-pressure heptafluoropropane extinguishant is an important part of fire safety guarantee of a high-speed rail signal control room. If the bottled high-pressure heptafluoropropane fire extinguishing agent in the high-speed rail signal control room slowly leaks for a long time, the originally designed sufficient fire extinguishing agent is insufficient in storage amount, once a fire disaster occurs, the fire extinguishing failure can be caused, and even major high-speed rail accidents such as shutdown and the like are caused. Therefore, the real-time detection of the leakage state of the bottled high-pressure heptafluoropropane has great engineering practical significance.
Some research has been conducted on leak detection of high pressure vessels and valves. The traditional leakage detection mode is usually to submerge the whole container bottle in water and observe whether bubbles emerge or not, so that whether leakage exists or not is judged, and the method is only suitable for the condition that the leakage exists obviously. Patent ZL 200620104737.9 achieves quantitative measurements by exhausting air with water and collecting the leaking gas, however, this method often results in corrosion of the container by water vapor. Patent ZL 2015103286630 adopts the pressure differential method to carry out the leakage measurement to container and valve department, because the leakage rate of the heptafluoropropane of the high pressure of most bottled is relatively weak, and this method is great in the error in the in-service use process, and it is difficult directly to carry out accurate measurement. Therefore, how to accurately measure the tiny leakage behavior of bottled high-pressure heptafluoropropane is a difficult problem which puzzles the maintenance of fire extinguishing systems in important places such as high-speed rail machine rooms, and the development of the measurement technology has important significance for the judgment and decision of safety management personnel and maintenance personnel of the high-speed rail machine rooms.
SUMMERY OF THE UTILITY MODEL
The utility model discloses solve the technical problem and do: the defects of the prior art are overcome, and the device is convenient to install and high in precision and aims at detecting the tiny leakage rate of the bottled high-pressure heptafluoropropane fire extinguishing agent in real time.
The utility model discloses a following technical scheme realizes:
a bottled high-pressure heptafluoropropane fire extinguishing agent leakage amount real-time detection device comprises a measurement cavity and a vacuum fixed cavity, wherein the measurement cavity and the vacuum fixed cavity are arranged on a bottle body to be measured, the measurement cavity is formed by closing a measurement cavity left shell and a measurement cavity right shell, and the vacuum fixed cavity is formed by closing a vacuum fixed cavity left shell and a vacuum fixed cavity right shell; the measurement cavity left shell and the measurement cavity right shell and the vacuum fixed cavity left shell and the vacuum fixed cavity right shell are connected and closed through a shell fixing component. The vacuum air pump is respectively connected with the first interface and the second interface to vacuumize the measurement cavity and the vacuum fixing cavity; a pressure difference is formed between the vacuum condition in the vacuum fixed cavity and the external environment, so that the device is adsorbed and fixed on the measuring bottle body; the air in the measuring cavity is pumped out, so that the accurate determination of the leakage amount of the heptafluoropropane is facilitated. The heptafluoropropane gas detection module is connected with the measurement cavity through a guide pipe, the concentration of heptafluoropropane in the measurement cavity is read, and then the real-time leakage amount of heptafluoropropane is calculated.
Furthermore, an inner window is arranged on the measuring cavity corresponding to the position of the in-bottle pressure measuring meter, an outer window is arranged on the vacuum fixing cavity corresponding to the position of the in-bottle pressure measuring meter, and the inner window and the outer window are used for observing the number of the in-bottle pressure measuring meter.
Furthermore, a fixed sealing gasket is arranged on the shell fixing component, and the fixing component is tightly connected through a fixing bolt and a fixing nut, so that the left shell of the measurement cavity and the right shell of the measurement cavity are connected into a closed measurement cavity, and the left shell of the vacuum fixing cavity and the right shell of the vacuum fixing cavity are connected into a closed vacuum fixing cavity.
Furthermore, the pressure gauge is arranged at the top of the left shell of the measuring cavity and is connected with the first valve and the first interface; the first interface is used for connecting a vacuum air pump; the pressure gauge is used for observing the pressure state of the leaked gas in the first cavity, so that the leakage state of the bottled high-pressure heptafluoropropane fire extinguishing agent is judged; the first valve is used for controlling the opening and closing state of the measuring cavity.
Furthermore, the lower guide pipe is connected with the measuring cavity and the lower gas detection module, and the upper guide pipe is connected with the measuring cavity and the upper gas detection module. The upper module and the lower module are used for simultaneous measurement, and the average value is taken as the concentration of the heptafluoropropane in the cavity.
Furthermore, the vacuum fixing cavity is positioned at the periphery of the measuring cavity, the vacuum fixing cavity is tightly attached to the bottle body through pressure difference formed between the vacuum fixing cavity and the external environment, and the measuring cavity and the vacuum fixing cavity are mutually separated through a second sealing element; the fire extinguishing agent conveying pipeline penetrates through the measuring cavity and the vacuum cavity to realize the normal fire extinguishing agent conveying function; the third sealing element, the fourth sealing element and the sealing ring realize the sealing performance of the fire extinguishing agent conveying pipeline at the position of penetrating through the measuring cavity and the vacuum cavity.
Further, after the bottled high-pressure heptafluoropropane fire extinguishing agent leakage amount real-time detection device is installed, leaked heptafluoropropane is collected through the measurement cavity, and the accumulated leakage amount of heptafluoropropane under the condition of a small leakage rate is quantitatively measured through the gas detection module.
Compared with the prior art, the utility model the advantage be:
(1) the utility model discloses can the slow accumulation of leaking the in-process of heptafluoropropane of accurate measurement let out leakage quantity and then calculate the leakage rate, avoid being difficult to the accurate measurement after being diluted by the air mixing because the leakage material that leads to slowly leaks.
(2) The utility model discloses the simple installation, and dismantled and assembled recovery, can carry out leak detection to the bottle that dispatches from the factory, also can carry out the measurement of accumulative leakage quantity to the bottle that has used.
(3) The utility model discloses an installation does not influence fire extinguishing systems normal use with the use, can detect the long-term leakage condition of high-pressure bottled high-pressure heptafluoropropane.
Drawings
To illustrate the construction of the invention and the manner in which it is implemented more clearly, reference will now be made in detail to a series of drawings which illustrate an example embodiment of the invention.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the assembly structure of the present invention;
FIG. 3 is an enlarged view of the fire suppressant delivery conduit seal of FIG. 1;
fig. 4 is an enlarged view of the seal attachment position of fig. 2.
Reference numerals: 1 is a bottle body to be measured; 11 is a bottle internal pressure measuring meter; 12 is a fire extinguishing agent conveying pipeline; 2 is a measuring cavity; 21 is a measurement cavity left shell; 22 is a measurement cavity right shell; 23 is an internal window; 3 is a vacuum fixing cavity; 31 is a vacuum fixed cavity left shell; 32 is a vacuum fixed cavity right shell; 33 is an outer window; 41 is a housing fixing member; 42 is a fixed sealing gasket; 43 is a fixing bolt; 44 is a fixing nut; 51 is a pressure gauge; 52 is a first valve; 53 is a first interface; 54 is a second valve; 55 is a second interface; 61 is a lower conduit; 62 is a lower gas detection module; 63 is an upper conduit; 64 is an upper gas detection module; 71 is a first seal; 72 is a second seal; 73 is a third seal; 74 is a fourth seal; and 75 is a sealing ring.
Detailed Description
For making the purpose, embodiment and technical advantages of the utility model clearer, combine the drawings in the utility model, it is right that the technical scheme in the implementation process of the utility model carries out clear and complete description. It is stated that the embodiments described are some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the scope protected by the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "left", "right", "inside", "outside", and the like are used only to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships may also be changed accordingly. The "connection" is not limited to a specific connection form, and may be a direct connection, an indirect connection through other components, a non-detachable connection, a detachable connection, an electrical or signal connection, or a mechanical or physical connection.
Example 1
As shown in fig. 1 and fig. 2, the present embodiment is a device for detecting leakage of bottled high-pressure heptafluoropropane fire extinguishing agent in real time, which is mounted on a bottle body 1 to be measured, and the device for detecting leakage of heptafluoropropane fire extinguishing agent mainly comprises a measuring cavity 2 and a vacuum fixing cavity 3. The fire extinguishing agent delivery pipe 12 is closed by the measurement cavity left shell 21 and the measurement cavity right shell 22 through openings for passing the pipe in the measurement cavity 2 and the vacuum fixing cavity 3, and the vacuum fixing cavity left shell 31 and the vacuum fixing cavity right shell 32 are closed, so that the fire extinguishing agent delivery pipe 12 is tightly wrapped by the third sealing element 73 and the fourth sealing element 74, and the fire extinguishing agent delivery pipe 12 is wrapped by the sealing ring 75, and the vacuum fixing cavity 3 is isolated from the external environment and the measurement cavity 2 at the opening. The first sealing member 71 of the vacuum fixing chamber 3 is closely attached to the bottle body 1 to be measured, and the second sealing member 72 of the measuring chamber 2 is also closely attached to the bottle body 1 to be measured. The housing fixing means are connected by means of fixing bolts 43 and fixing nuts 44, and the fixing members are provided with fixing gaskets 42, so that the measuring chamber 2 and the vacuum fixing chamber 3 are closed.
The vacuum fixing cavity left shell 31 is connected with the second interface 55, and a second valve 54 is arranged in the middle for controlling the communication state between the vacuum fixing cavity 3 and the second connecting port 55. The vacuum pump was connected to the second port 55, and then the second valve 54 was opened to pump the vacuum fixing chamber 3 to 5 kPa. At this time, the pressure difference between the vacuum fixing cavity 3 and the external environment and between the measurement cavity 2 causes the first sealing member 71 and the second sealing member 72 to be closely attached to the bottle body 1 to be measured, thereby realizing the sealing state of the vacuum fixing cavity 3. The second valve 54 is closed and the connection between the second port 55 and the vacuum pump is broken, completing the installation of the device to the heptafluoropropane bottle.
The upper part of the left shell 21 of the measuring cavity is connected with a first interface 53, and a first valve 52 is arranged in the middle. A pressure gauge 51 is arranged between the first valve 52 and the left shell 21 of the measuring cavity. Connecting the vacuum air pump to the first interface 53, opening the first valve 52, pumping the gas in the measurement chamber 2 to the air pressure gauge 51, indicating that the pressure is 20kPa, closing the first valve 52, and disconnecting the first interface 53 from the vacuum air pump.
The measurement chamber 2 is connected to a lower gas detection module 62 via a lower conduit 61, and the measurement chamber 2 is connected to an upper gas detection module 64 via an upper conduit 63.
After the installation operation of the device for detecting the leakage amount of the bottled high-pressure heptafluoropropane fire extinguishing agent is finished, the time t is up1And then, reading the detection result of the leakage of the bottled high-pressure heptafluoropropane.
Example 2
This example is different from example 1 in that the bottled high-pressure heptafluoropropane fire extinguishing agent leakage amount detection device has been installed and the working time is known as tk. Reading the reading of the pressure gauge 51 and comparing the reading with the reference pressure of 20kPa, so as to judge the leakage state of the bottled high-pressure heptafluoropropane fire extinguishing agent; the concentration values of the heptafluoropropane detected by the lower gas detection module 62 and the upper gas detection module 64 are recorded, and t can be calculatedkAmount of leakage over time and leakage rate.
Connecting the vacuum air pump with the first interface 53, opening the first valve 52, pumping out the gas in the measurement cavity 2, and disconnecting the vacuum air pump from the first interface 53, so that the air enters the measurement cavity 2; the above pumping steps are repeated until the lower gas detection module 62 and the upper gas detection module 64 indicate that the concentration of heptafluoropropane in the measurement cavity 2 is 0. The pressure in the measurement chamber 2 is reduced to 20kPa, the first valve 52 is closed and the connection between the vacuum pump and the first port 53 is disconnected.
The total leakage amount of the high-pressure heptafluoropropane in the long-term bottle can be obtained by accumulating the leakage amount of the heptafluoropropane fire extinguishing agent in each time period.
The working mode of the bottled high-pressure heptafluoropropane fire extinguishing agent leakage amount real-time detection device is as follows:
step (1), determining the total amount of a safety critical fire extinguishing agent required by a protection area;
step (2), determining the amount of an initial heptafluoropropane fire extinguishing agent in each bottled high-pressure heptafluoropropane in the protection area;
step (3), determining the effective volume in the measuring cavity;
step (4), obtaining a concentration value of heptafluoropropane according to measurement of an upper module and a lower module in the measurement cavity each time, and obtaining an average concentration value of heptafluoropropane in the measurement cavity;
and (5) calculating the accumulated leakage amount of the fire extinguishing agent of each bottled high-pressure heptafluoropropane after the detection results of the whole protection area are detected for multiple times, comparing the accumulated leakage amount with the total amount of the safety critical fire extinguishing agent of the protection area, and determining whether maintenance or replacement of the bottled high-pressure heptafluoropropane in the protection area is required.
This bottled high-pressure heptafluoropropane fire extinguishing agent leaks leakage quantity real-time detection device's working method still includes:
(1) obtaining the total amount M of the heptafluoropropane fire extinguishing agent required by the protected area according to the related fire-fighting design specifications of the protected areatIn units of kg;
(2) determining the quantity of the fire extinguishing agent in each bottled high-pressure heptafluoropropane of a protection area to be M1，M2…MnThe unit is kg, wherein n is the number of heptafluoropropane bottles in the protective area;
(3) determining the effective volume in the measurement cavity as V in L;
(4) for a single tank in the protection area, the concentration value of the heptafluoropropane in the measurement cavity is c ═ c (c)up+cdown) /2 wherein cupConcentration value of heptafluoropropane measured by upper gas detection module and having unit of mol/L, cdownThe concentration value of the heptafluoropropane measured by a lower gas detection module is in mol/L;
(5) putting a heptafluoropropane bottle into service for a time t1Then, the concentration value of heptafluoropropane in the measurement space obtained by the first measurement is c1(ii) a The heptafluoropropane in the measuring cavity is pumped out for a time t2Then, a second measurement is carried out to obtain a concentration value c of the heptafluoropropane in the measurement space2(ii) a Repeating the above operation to obtain the concentration value c of the heptafluoropropane in the k-th measurement spacek. For the heptafluoropropane bottle body is (t)1+t2+…+tk) The leakage in time is the sum of the leakage in each time period, i.e. M is MmolV(c1+c2+…+ck) The leakage rate is
Wherein M ismolIs the unit molar mass of the heptafluoropropane in kg/mol;
(6) making statistics on leakage of all heptafluoropropane bottle bodies in the protection area, comparing the residual amount of the heptafluoropropane fire extinguishing agent in the protection area with the total amount of the heptafluoropropane fire extinguishing agent required by the protection area, and if M is greater than M, counting leakage of all heptafluoropropane bottle bodies in the protection area, and if M is less than M, comparing the residual amount of the heptafluoropropane fire extinguishing agent in the protection area with the total amount of the heptafluoropropane fire extinguishing agent required by the protection areat＝<(M1+M2+…+Mn)-(m1+m2+…+mn) The amount of remaining heptafluoropropane meets the fire design requirements of the protected area; if M ist>(M1+M2+…+Mn)-(m1+m2+…+mn) The amount of remaining heptafluoropropane does not satisfy the fire design requirement of the protection area and the bottled high-pressure heptafluoropropane needs to be replaced, wherein m1，m2…mnRespectively n bottles in the protective zoneThe cumulative amount of heptafluoropropane leaked from each body;
(7) by calculating the leakage rate of the bottle body of the heptafluoropropane in the protection area as
Estimating the effective working time of heptafluoropropane in the protected area as
Thereby the detection work that the bottled high-pressure heptafluoropropane leaked is rationally arranged, and the bottled high-pressure heptafluoropropane is timely replaced.
The technical contents not described in detail in the present invention are all known techniques.
Claims (7)
1. The device for detecting the leakage amount of the bottled high-pressure heptafluoropropane fire extinguishing agent in real time is characterized by comprising a measuring cavity (2) and a vacuum fixing cavity (3), wherein the measuring cavity (2) is installed on a bottle body (1) to be measured, the measuring cavity (2) is formed by closing a measuring cavity left shell (21) and a measuring cavity right shell (22), and the vacuum fixing cavity (3) is formed by closing a vacuum fixing cavity left shell (31) and a vacuum fixing cavity right shell (32); the measurement cavity left shell (21) and the measurement cavity right shell (22) and the vacuum fixed cavity left shell (31) and the vacuum fixed cavity right shell (32) are connected and closed through a shell fixing component (41); the vacuum air pump respectively vacuumizes the measuring cavity (2) and the vacuum fixing cavity (3) by connecting the first interface (53) and the second interface (55); the vacuum environment of the vacuum fixing cavity (3) provides negative pressure for adsorption and is connected to the measuring bottle body; the measuring cavity (2) is connected with the heptafluoropropane gas detection module through a guide pipe, the concentration of heptafluoropropane in the measuring cavity (2) is read, and the real-time leakage amount of heptafluoropropane is obtained through calculation.
2. The device for detecting the leakage of the bottled high-pressure heptafluoropropane fire extinguishing agent in real time according to claim 1, wherein an inner window (23) is arranged at the position of the corresponding in-bottle pressure measuring meter (11) on the measuring cavity (2), an outer window (33) is arranged at the position of the corresponding in-bottle pressure measuring meter (11) on the vacuum fixing cavity (3), and the inner window (23) and the outer window (33) are used for observing the measured value of the in-bottle pressure.
3. The bottled high-pressure heptafluoropropane fire extinguishing agent leakage amount real-time detection device according to claim 1, wherein the pressure measuring meter (51) is arranged at the top of the measurement cavity (2) and is connected with the first valve (52) and the first interface (53); the first interface (53) is used for connecting a vacuum air pump; the pressure measuring meter (51) is used for measuring the pressure state in the cavity (2) so as to judge the leakage state of the bottled high-pressure heptafluoropropane fire extinguishing agent.
4. The device for detecting the leakage amount of the bottled high-pressure heptafluoropropane fire extinguishing agent in real time according to claim 1, wherein the measuring cavity (2) is connected with an upper gas detection module (64) and a lower gas detection module (62), and a concentration value of heptafluoropropane gas in the measuring cavity (2) is obtained through the two gas detection modules.
5. The apparatus for detecting the leakage of a bottled high-pressure heptafluoropropane fire extinguishing agent in real time according to claim 1, wherein the housing fixing member (41) is tightly coupled by a fixing bolt (43) and a fixing nut (44), and a fixing gasket (42) is provided on the fixing member.
6. The bottled high-pressure heptafluoropropane fire extinguishing agent leakage real-time detection device according to claim 1, wherein the fire extinguishing agent conveying pipeline (12) passes through the measurement cavity (2) and the vacuum cavity to realize a normal fire extinguishing function; when the fire extinguishing agent conveying pipeline (12) passes through the measurement cavity (2) and the vacuum cavity, the third sealing element (73), the fourth sealing element (74) and the sealing ring (75) isolate and seal the external environment from the vacuum cavity and the measurement cavity (2).
7. The device for detecting the leakage amount of the bottled high-pressure heptafluoropropane fire extinguishing agent in real time according to claim 1, wherein leaked heptafluoropropane is collected through the measuring cavity (2), and the gas detection module measures the accumulated leakage amount of the heptafluoropropane under the condition of a small leakage rate in real time.
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