CN211527737U - Nitrogen gas tightness testing machine for fire-fighting collecting pipe - Google Patents
Nitrogen gas tightness testing machine for fire-fighting collecting pipe Download PDFInfo
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- CN211527737U CN211527737U CN202020051249.6U CN202020051249U CN211527737U CN 211527737 U CN211527737 U CN 211527737U CN 202020051249 U CN202020051249 U CN 202020051249U CN 211527737 U CN211527737 U CN 211527737U
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Abstract
A nitrogen gas tightness testing machine for a fire-fighting collecting pipe comprises a gas source, a pre-charging valve, a buffer container, an inflation valve, a standard container, a pressure sensor, a deflation valve and a silencer; the air source, the pre-charging valve, the buffer container, the inflation valve and the standard container are connected in sequence; the pressure sensor comprises a first pressure sensor and a second pressure sensor, and the first pressure sensor and the second pressure sensor are respectively arranged on the buffer container and the standard container and are connected with the buffer container and the standard container; and the standard container, the air release valve and the silencer are sequentially connected. A airtight test machine of nitrogen gas for fire control pressure manifold, the cost is lower, simple structure, adopts external pressure direct compression method gas tightness detection method, the temperature influence of having solved traditional direct compression type detection method is great relatively, detection efficiency and precision problem lower relatively, the flexibility is high, has improved detection precision and efficiency, application prospect is extensive.
Description
Technical Field
The utility model relates to an airtight test machine technical field, concretely relates to airtight test machine of nitrogen gas for fire control pressure manifold.
Background
The fire-fighting collecting main is a pipeline from the fire extinguishing agent storage bottle to all parts between the selection valves (excluding the pressure hose) and is used for collecting the fire extinguishing agent released by each fire extinguishing agent storage bottle. The fire-fighting collecting pipe is formed by welding high-quality seamless steel pipes which are thickened at national standard by argon arc welding and then hot galvanizing inside and outside, and has uniform inner and outer plating layers and attractive appearance. Simultaneously, for installation convenience, a safety relief valve interface is reserved on the fire-fighting collecting pipe according to needs.
With the wide application of the fire-fighting collecting pipe, the quality of the pipeline of the collecting pipe is ensured to be a main competitive factor of a plurality of production enterprises. In order to prevent unqualified products from breaking in use to cause serious consequences such as economic loss and pollution, each fire-fighting collecting pipe needs to be subjected to strict air tightness test before leaving a factory, and good air tightness performance is guaranteed to be applied.
The air tightness detection equipment commonly used in industrial production is basically designed according to a gas flow formula. At present, the air tightness detection method mainly comprises a bubble type detection method and a pneumatic type detection method, wherein the pneumatic type detection method is widely applied to industrial production. The air tightness detection can be divided into two detection methods, namely a direct pressure type detection method and a differential pressure type detection method. The differential pressure method uses a standard component as reference, can offset errors caused by factors such as partial temperature and the like, but has higher cost and more complex structure; the traditional direct pressure type detection method has the advantages of low cost and simple structure, but the temperature influence is relatively large, and the detection efficiency and the detection precision are relatively low. Generally, the two methods calculate the leakage flow by detecting the internal pressure change of the detected fire-fighting collecting pipe, and the method is used for a fully-sealed device such as a camera
Pieces are not suitable. In order to improve the precision and the efficiency, a nitrogen gas tightness testing machine for the fire-fighting collecting pipe needs to be designed.
Chinese patent application No. CN201720138059.6 discloses a novel airtight test machine, including frame, control panel, power input line, roof, cylinder, activity clamp plate elevating system, go up activity clamp plate, bottom plate, airtight frock, water tank elevating system and bottom plate, do not have specially to the fire control pressure manifold to precision, efficiency can further improve.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome not enough above, the utility model aims at providing a nitrogen gas tightness test machine for fire control pressure manifold, the cost is lower, simple structure adopts external pressure direct compression method gas tightness detection method, and the temperature that has solved traditional direct compression type detection method influences great relatively, detection efficiency and precision problem lower relatively, and the flexibility is high, has improved detection precision and efficiency, and application prospect is extensive.
The technical scheme is as follows: a nitrogen gas tightness testing machine for a fire-fighting collecting pipe comprises a gas source, a pre-charging valve, a buffer container, an inflation valve, a standard container, a pressure sensor, a deflation valve and a silencer; the air source, the pre-charging valve, the buffer container, the inflation valve and the standard container are connected in sequence; the pressure sensor comprises a first pressure sensor and a second pressure sensor, and the first pressure sensor and the second pressure sensor are respectively arranged on the buffer container and the standard container and are connected with the buffer container and the standard container; and the standard container, the air release valve and the silencer are sequentially connected.
A nitrogen gas airtight test machine for fire control pressure manifold, adopt external pressure vertical compression method gas tightness detection method, the pressure change rate after nitrogen gas airtight test machine passes through the balance of standard container connects the size that obtains being surveyed fire control pressure manifold leakage rate.
The working principle is as follows: and (3) placing the fire-fighting collecting pipe to be detected in the standard container, and automatically filling gas with fixed pressure into the buffer container by a gas source in each detection period. Firstly, the inflation valve is opened to inflate the standard container, and the inflation valve is closed when the pressure in the standard container reaches the test pressure and is stable. After the inflation is finished, whether the fire fighting collecting pipe is leaked greatly or not can be judged by comparing a theoretical calculation value and an actual pressure value in the standard container, if the fire fighting collecting pipe is not leaked greatly, the leakage rate of the leaked fire fighting collecting pipe under the test pressure can be calculated by detecting the change of the pressure in the standard container through a high-precision pressure sensor after the fire fighting collecting pipe is balanced. And after the test is finished, opening the air release valve to exhaust.
Further, in the nitrogen gas tightness testing machine for the fire-fighting collecting pipe, a filtering pressure regulating valve and a precise pressure regulating valve are sequentially arranged between the gas source and the pre-charging valve.
Filtration air-vent valve, select for use air filter pressure regulating integration product GFR300 filtration air-vent valve of the company of subdue, its pressure control scope is 0.15~0.9MPa, filter fineness is 5, the drainage mode is automatic differential pressure drainage. Accurate air-vent valve, select for use Japanese CKD's accurate relief pressure valve RP1000 series, its takeover bore is Rc1/4, the highest service pressure is 1.0MPa, the pressure settlement scope is 3~200kPa, the precision is 0.1% FS. The filtering and pressure regulating valve can be used for realizing drying, filtering and rough regulation of gas source gas; the precise pressure regulating valve can provide precise pressure for the buffer container.
Further, in the nitrogen gas tightness testing machine for the fire-fighting collecting pipe, a standard cylinder and a two-position five-way valve are sequentially arranged between the standard container and the air release valve.
The standard cylinder realizes the sealing and opening of the standard container under the control of the two-position five-way valve. The two-position five-way valve is a high-performance direct-acting two-position five-way valve of an SMCVX22 series, the air tightness effect is very good, and the leakage rate within the highest action pressure difference of 1.5MPa is less than 10 < -6 > Pa.m 3/s.
Further, according to the nitrogen gas tightness testing machine for the fire-fighting collecting pipe, the standard container is of a two-section structure, and the upper section and the lower section of the standard container are sealed through O-shaped sealing rings.
Further, in the nitrogen gas tightness testing machine for the fire-fighting collecting pipe, the upper part of the standard container is effectively sealed through an O-shaped sealing ring and a round-head upper cover, and the sealing form is axial sealing with external pressure; the bottom of the standard container is an aluminum connecting bottom plate.
For the dismouting of making things convenient for the standard container is changed and the fire control pressure manifold is placed, the standard container is two segmentation structures, in order to ensure good leakproofness, the upper and lower section is sealed through standard O type sealing washer, and upper portion is effectively sealed through sealing washer and button head upper cover equally, and the sealed form of this structure is outside axial seal who receives pressure, and a aluminium system connection bottom plate has been designed to the bottom.
Further, according to the nitrogen gas airtightness testing machine for the fire-fighting collecting pipe, the two sides of the lower section of the standard container are respectively provided with the air inlet hole and the pressure taking hole, and the air inlet hole and the pressure taking hole are 1/4RC pipe threaded holes.
To ensure sealing, the air inlet hole and the pressure taking hole are designed into 1/4RC pipe threaded holes.
Further, the nitrogen gas tightness testing machine for the fire-fighting collecting pipe further comprises a control mechanism, wherein the control mechanism comprises an analog input module AI and a digital input/output DI/DO; the analog input module AI is connected with the first pressure sensor and the second pressure sensor, and the digital input/output DI/DO is connected with the pre-charging valve, the charging valve and the deflation valve.
The analog input module AI is responsible for collecting sensor data, and the pressure sensor I is used for detecting the inflation pressure in the buffer container to ensure that the pressure in the standard container can meet the test pressure of the fire-fighting collecting pipe; and the second pressure sensor is used for acquiring pressure change in the standard container, and finally calculating the leakage rate of the fire-fighting collecting pipe through data analysis and processing. And the digital input and output DI/DO realizes the processing and control of an external pre-charging valve, an external inflation valve and an external deflation valve.
The utility model has the advantages that: a airtight test machine of nitrogen gas for fire control pressure manifold, the cost is lower, simple structure, adopts external pressure direct compression method gas tightness detection method, the temperature influence of having solved traditional direct compression type detection method is great relatively, detection efficiency and precision problem lower relatively, the flexibility is high, has improved detection precision and efficiency, application prospect is extensive.
Drawings
Fig. 1 is an overall structure diagram of a nitrogen gas tightness testing machine for a fire-fighting collecting pipe according to the present invention;
fig. 2 is a sectional view of a standard container structure of the nitrogen gas tightness testing machine for the fire-fighting collecting pipe of the present invention;
fig. 3 is a connection diagram of a control mechanism of the nitrogen gas tightness testing machine for the fire-fighting collecting pipe according to the present invention;
in the figure: the device comprises an air source 1, a pre-charging valve 2, a filtering pressure regulating valve 21, a precision pressure regulating valve 22, a buffer container 3, an inflation valve 4, a standard container 5, a standard air cylinder 51, a two-position five-way valve 52, an O-shaped sealing ring 53, a round-head upper cover 54, an aluminum connecting bottom plate 55, an air inlet 56, a pressure taking hole 57, a pressure sensor 6, a first pressure sensor 61, a second pressure sensor 62, a deflation valve 7, a silencer 8, a control mechanism 9, an analog input module AI91 and digital input and output DI/DO 92.
Detailed Description
The present invention will be further elucidated with reference to the accompanying drawings 1 to 3 and the embodiments.
The nitrogen gas airtightness testing machine for the fire-fighting collecting pipe with the structure shown in fig. 1 comprises a gas source 1, a pre-charging valve 2, a buffer container 3, an inflation valve 4, a standard container 5, a pressure sensor 6, a deflation valve 7 and a silencer 8; the air source 1, the pre-charging valve 2, the buffer container 3, the inflation valve 4 and the standard container 5 are connected in sequence; the pressure sensor 6 comprises a first pressure sensor 61 and a second pressure sensor 62, and the first pressure sensor 61 and the second pressure sensor 62 are respectively arranged on the buffer container 3 and the standard container 5 and are connected with the buffer container 3 and the standard container 5; and the standard container 5, the air release valve 7 and the silencer 8 are connected in sequence.
In addition, a filtering pressure regulating valve 21 and a precision pressure regulating valve 22 are sequentially arranged between the gas source 1 and the pre-charging valve 2.
In addition, a standard cylinder 51 and a two-position five-way valve 52 are sequentially arranged between the standard container 5 and the air release valve 7.
In addition, as shown in fig. 2, the standard container 5 has a two-stage structure, and the upper and lower stages of the standard container 5 are sealed by O-rings 53.
Further, the upper part of the standard container 5 is effectively sealed by an O-shaped sealing ring 53 and a round head upper cover 54, and the sealing is in the form of an external axial seal under pressure; the bottom of the standard container 5 is an aluminum connection bottom plate 55.
In addition, the standard container 5 is provided with an air inlet hole 56 and a pressure taking hole 57 on both sides of the lower section thereof, and the air inlet hole 56 and the pressure taking hole 57 are 1/4RC pipe threaded holes.
Further, as shown in fig. 3, the controller 9 is further included, and the controller 9 includes an analog input module AI91, and a digital input/output DI/DO 92; the analog input module AI91 is connected with the first pressure sensor 61 and the second pressure sensor 62, and the digital input/output DI/DO92 is connected with the pre-charging valve 2, the charging valve 4 and the deflation valve 7.
Examples
The structural basis is as shown in FIGS. 1 to 3.
A nitrogen gas airtight test machine for fire control pressure manifold, during the detection, the fire control pressure manifold that will await measuring is arranged in the standard container 5, in every detection cycle, air supply 1 will fill into fixed pressure's nitrogen gas to buffer container 3 automatically. A filtering and pressure regulating valve 21, a precise pressure regulating valve 22 and a pre-charging valve 2 are sequentially arranged between the gas source 1 and the buffer container 3, the filtering and pressure regulating valve 21 can be used for drying, filtering and roughly adjusting the gas of the gas source 1, the precise pressure regulating valve 22 can provide precise pressure for the buffer container 3, and the pre-charging valve 2 can seal and open the buffer container 3.
(1) And (3) an inflation stage: after the standard container 5 is sealed, the inflation valve 4 is opened, the standard cylinder 51 opens the standard container 5 under the control of the two-position five-way valve 52, and the gas in the buffer container 3 with certain pressure is filled into the standard container 5. Since the inflation causes frequent collisions between the gas and the container wall, thereby generating shock oscillations, the pressure and temperature of the gas fluctuate, and it is necessary to wait for the gas to stabilize. And judging whether the fire-fighting collecting pipe leaks greatly or not by comparing the pressure after the inflation and the theoretical pressure value when the fire-fighting collecting pipe does not leak, and if so, immediately finishing the test.
(2) And (3) a balancing stage: after the standard container 5 is completely inflated, the inflation valve 4 is closed, and the standard cylinder 51 realizes sealing of the standard container 5 under the control of the two-position five-way valve 52. Because the switching action of the inflation valve 4 can cause the gas pressure in the standard container 5 to vibrate, thereby causing the gas state in the standard container 5 to be unstable, the test stage can be started to detect after the gas state is recovered to be stable.
(3) And (3) a testing stage: and recording the data of the second pressure sensor 62 in the standard container 5 within preset test time, calculating the leakage rate of the tested fire-fighting collecting pipe through data processing and analysis, and comparing the solved leakage rate with a set threshold value to obtain a final detection result.
(4) And (3) an air release stage: and after the test stage is finished, opening the air release valve 7 for air release, and simultaneously opening the sealed standard container 5 to finish a test period. In order to improve the system detection efficiency, after the inflation is finished, the pre-charging valve 2 is opened at the same time, and the pressure in the buffer container 3 is adjusted to a preset value.
Wherein the control means 9 are arranged to control the entire test procedure. An analog input module AI91 of the control mechanism 9 is responsible for acquiring sensor data, and a first pressure sensor 61 is used for detecting the inflation pressure in the buffer container 3 to ensure that the pressure in the standard container 5 can meet the test pressure of the fire-fighting collecting pipe; the second pressure sensor 62 is used for acquiring pressure change in the standard container 5, and finally calculating the leakage rate of the testing fire-fighting collecting pipe through data analysis and processing. The digital input and output DI/DO92 realizes the processing and control of the external pre-charging valve 2, the charging valve 4 and the deflation valve 7.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.
In addition, the embodiments of the present invention can be arbitrarily combined with each other, and the same shall be regarded as the disclosure of the present invention as long as the idea of the present invention is not violated.
Claims (7)
1. A nitrogen gas airtightness testing machine for a fire-fighting collecting pipe is characterized by comprising a gas source (1), a pre-charging valve (2), a buffer container (3), an inflation valve (4), a standard container (5), a pressure sensor (6), a deflation valve (7) and a silencer (8); the air source (1), the pre-charging valve (2), the buffer container (3), the inflation valve (4) and the standard container (5) are connected in sequence; the pressure sensor (6) comprises a first pressure sensor (61) and a second pressure sensor (62), and the first pressure sensor (61) and the second pressure sensor (62) are respectively arranged on the buffer container (3) and the standard container (5) and are connected with the buffer container (3) and the standard container (5); the standard container (5), the air release valve (7) and the silencer (8) are connected in sequence.
2. The nitrogen airtightness testing machine for the fire-fighting collecting pipe as claimed in claim 1, wherein a filtering pressure regulating valve (21) and a precision pressure regulating valve (22) are further provided in sequence between the gas source (1) and the pre-charging valve (2).
3. The nitrogen airtightness testing machine for the fire fighting collecting pipe as claimed in claim 1, wherein a standard cylinder (51) and a two-position five-way valve (52) are further provided in sequence between the standard container (5) and the air relief valve (7).
4. The nitrogen airtightness testing machine for a fire fighting header according to claim 1, wherein the standard container (5) has a two-stage structure, and upper and lower stages of the standard container (5) are sealed by O-ring seals (53).
5. The nitrogen gas tightness tester for fire fighting manifolds according to claim 4, characterized in that the upper part of the standard container (5) is effectively sealed by an O-ring seal (53), a round top cover (54) and the sealing is in the form of an external pressurized axial seal; the bottom of the standard container (5) is an aluminum connecting bottom plate (55).
6. The nitrogen airtightness testing machine for the fire-fighting collecting pipe according to claim 4, wherein an air inlet hole (56) and a pressure taking hole (57) are respectively formed in two sides of a lower section of the standard container (5), and the air inlet hole (56) and the pressure taking hole (57) are 1/4RC pipe threaded holes.
7. The nitrogen airtightness testing machine for fire fighting collecting pipe according to claim 1, further comprising a control mechanism (9), wherein the control mechanism (9) includes an analog input module AI (91), a digital input/output DI/DO (92); the analog input module AI (91) is connected with the first pressure sensor (61) and the second pressure sensor (62), and the digital input/output DI/DO (92) is connected with the pre-charging valve (2), the charging valve (4) and the deflation valve (7).
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| CN202020051249.6U CN211527737U (en) | 2020-01-10 | 2020-01-10 | Nitrogen gas tightness testing machine for fire-fighting collecting pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117969629A (en) * | 2024-04-02 | 2024-05-03 | 四川省疾病预防控制中心(四川省预防医学科学研究院四川省卫生监测检验中心) | System and method for detecting physiological index |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117969629A (en) * | 2024-04-02 | 2024-05-03 | 四川省疾病预防控制中心(四川省预防医学科学研究院四川省卫生监测检验中心) | System and method for detecting physiological index |
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