Intelligent civil air defense equipment leakproofness detection equipment

Abstract

The utility model provides intelligent civil air defense equipment leakproofness detection equipment, the leakproofness detection equipment comprises a fan pipeline, a nozzle pipeline, an air chamber and a measurement and control device, one end of the air chamber is connected with the fan pipeline through the nozzle pipeline, the other end of the air chamber is provided with a valve port, and a civil air defense equipment valve to be detected is placed at the valve port; an air chamber inner static pressure measuring device and a nozzle front pressure measuring device are arranged in the air chamber; a nozzle pressure difference measuring device is arranged in the nozzle pipeline; a fan is arranged in the fan pipeline; the fan, the air chamber inner static pressure measuring device, the nozzle front pressure measuring device and the nozzle pressure difference measuring device are simultaneously connected with the measurement and control device, the air tightness detection device has the advantages of being stable in data and simple and convenient to operate, the air tightness detection requirement of the civil air defense equipment can be met, and the air tightness detection of the sealing valve of the civil air defense equipment can be realized.

Description

[Technical field]

[0001] The utility model relates to the technical field of civil air defense pipeline sealing valves, in particular to an intelligent civil air defense equipment airtightness detection device. [Background technology]

[0002] At present, the country does not have a professional industry standard for protective closed valve products. In GB50134-2004 Civil Air Defense Engineering Construction and Acceptance Specifications, there are only provisions related to the quality of valve installation. The product standards of closed valve manufacturers only stipulate the valve air tightness test conditions, and the ventilation performance test of closed valves has never been mentioned before. As an indispensable equipment in the ventilation duct of civil air defense projects, the quality of its ventilation performance will definitely affect the comprehensive performance of the engineering ventilation system. Accurate ventilation performance testing of closed valves can truly understand the quality of valve pneumatic performance, which is a prerequisite for optimizing the valve pneumatic structure. On the other hand, it also provides accurate design data for the pipeline design of the ventilation system of civil air defense projects. Therefore, it is very necessary to test the ventilation performance of closed valves.

[0003] Therefore, it is necessary to study an intelligent civil air defense equipment tightness detection device to address the deficiencies of the existing technology in order to solve or alleviate one or more of the above problems. [Contents of the utility model]

[0004] In view of this, the utility model provides an intelligent civil air defense equipment tightness detection device, which has the advantages of stable data and simple and convenient operation, can meet the tightness detection requirements of civil air defense equipment, and realize the tightness detection of the sealing valve of civil air defense equipment.

[0005] On the one hand, the utility model provides an intelligent airtightness detection device for civil air defense equipment, the airtightness detection device comprising: a fan duct, a nozzle duct, a wind chamber and a measurement and control device, one end of the wind chamber is connected to the fan duct through the nozzle duct, and the other end is provided with a valve port, and the valve of the civil air defense equipment to be tested is placed at the valve port;

[0006] The wind chamber is provided with a static pressure measuring device inside the wind chamber and a pressure measuring device before the nozzle;

[0007] A nozzle differential pressure measuring device is provided in the nozzle pipeline;

[0008] A fan is arranged in the fan duct;

[0009] The fan, the static pressure measuring device in the wind chamber, the pressure measuring device before the nozzle and the pressure difference measuring device of the nozzle are connected to the measuring and controlling device at the same time.

[0010] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein a fan inlet is provided at one end of the fan duct, and a fan outlet is provided at the other end, the fan outlet is connected to the nozzle duct, the fan inlet is connected to the air, and a fan duct bracket is also provided under the fan duct.

[0011] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein the nozzle pipe includes a fan connecting part, a pressure measuring part and a wind chamber connecting part, one end of the fan connecting part is connected to the fan outlet, and the other end is connected to the wind chamber connecting part through the pressure measuring part, the pipe cross-sections of the fan connecting part and the wind chamber connecting part are not smaller than the pipe cross-section of the pressure measuring part, and the nozzle pressure difference measuring device is arranged in the pressure measuring part.

[0012] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein the air chamber comprises an air chamber frame, an air chamber skin, an air chamber air inlet and an air chamber air outlet, the air chamber skin is covered on the circumference of the air chamber frame, the air chamber air inlet and the air chamber air outlet are respectively arranged at two ends of the air chamber frame, the air chamber air inlet is connected to the air chamber connecting part, the valve port is arranged at the air chamber air outlet, the cross-section of the air chamber air inlet is smaller than the cross-section of the air chamber outlet, and the cross-section of the air chamber air inlet is larger than the pipe cross-section of the air chamber connecting part.

[0013] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein a fixing device is also provided at the valve mouth, and the valve of the civil air defense equipment to be tested is fixed at the air outlet of the wind chamber by the fixing device, and the area of ​​the valve of the civil air defense equipment to be tested is not larger than the area of ​​the valve mouth.

[0014] According to the aspects described above and any possible implementation, an implementation is further provided, wherein the static pressure measuring device in the wind chamber, the pressure measuring device before the nozzle and the pressure difference measuring device in the nozzle are all micro differential pressure transmitters.

[0015] According to the aspects described above and any possible implementation, an implementation is further provided, wherein the static pressure measuring device in the wind chamber is arranged in front of the wind chamber outlet, and the pre-nozzle pressure measuring device is arranged behind the wind chamber inlet.

[0016] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein a pressure stabilizing device, an atmospheric pressure transmitter and a temperature and humidity transmitter are also provided in the wind chamber, and the pressure stabilizing device is arranged between the static pressure measuring device in the wind chamber and the pressure measuring device before the nozzle.

[0017] According to the above aspects and any possible implementation, an implementation is further provided, wherein the measurement and control device includes a strong current module and a weak current module;

[0018] The high-voltage module is used to control the fan, and includes an air switch, a contactor, and a frequency converter. One end of the frequency converter is connected to the air switch through the contactor, and the other end is connected to the fan.

[0019] The weak current module includes a strong current control unit, an instrument power supply unit and a test data acquisition unit. The strong current control unit is connected to the strong current module. The instrument power supply unit is simultaneously connected to the static pressure measuring device in the wind chamber, the pressure measuring device in front of the nozzle and the nozzle pressure difference measuring device; the test data acquisition unit is simultaneously connected to the static pressure measuring device in the wind chamber, the pressure measuring device in front of the nozzle, the nozzle pressure difference measuring device and the fan.

[0020] According to the above aspects and any possible implementation, an implementation is further provided, wherein the air chamber skin is a Q235 plate having a thickness of 2-4 mm, and the air chamber frame is formed by welding square tubes.

[0021] Compared with the prior art, the utility model can obtain the following technical effects:

[0022] 1. A pressure stabilizing device is installed in the air chamber, and the static pressure in the air chamber is more stable than that in the pipeline;

[0023] 2. The cross-sectional area of ​​the wind chamber is larger than that of the pipe. Under the action of the pressure stabilizing device inside the wind chamber, the airflow in the wind chamber is uniform and stable, and the flow rate is slower, which can minimize the pressure error caused by uneven flow rate. The pressure data measured by the wind chamber device is more accurate;

[0024] 3. Regardless of the change in valve size (not exceeding the maximum test valve), it can be tested in the same wind chamber test device;

[0025] 4. The length of the wind chamber test device is shorter than that of the pipeline test device, which can reduce the space occupied by the device.

[0026] Of course, any product implementing the present utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a cross-sectional view of a leak-tightness detection device provided by one embodiment of the utility model;

[0029] Figure 2 It is a three-dimensional diagram of a tightness detection device provided by an embodiment of the utility model;

[0030] Figure 3 It is a 3D diagram of a leak-tightness detection device provided by one embodiment of the utility model.

[0031] Among them, in the figure:

[0032] 1- valve of civil air defense equipment to be tested; 2- air chamber; 21- static pressure measuring device in the air chamber; 22- pressure measuring device in front of the nozzle; 3- pressure stabilizing device; 4- nozzle pipeline; 41- nozzle differential pressure measuring device; 5- fan pipeline; 51- fan. [Specific implementation method]

[0033] In order to better understand the technical solution of the present utility model, the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0034] It should be clear that the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0036] The utility model provides an intelligent airtightness detection device for civil air defense equipment, which is used to test the airtightness of valves in civil air defense equipment. Figure 1-Figure 3 As shown, the airtightness detection equipment includes: a fan duct 5, a nozzle duct 4, a wind chamber 2 and a measurement and control device. One end of the wind chamber is connected to the fan duct through a nozzle duct, and the other end is provided with a valve port, and the valve port is used to place the valve 1 of the civil air defense equipment to be tested;

[0037] The air chamber 2 is provided with:

[0038] The static pressure measuring device 21 in the wind room is used to measure the static pressure of the cross section in the wind room;

[0039] The nozzle front pressure measuring device 22 is used to measure the pressure of the nozzle front section;

[0040] The nozzle pipe 4 is provided with:

[0041] The nozzle pressure difference measuring device 41 is used to measure the nozzle cross-sectional pressure difference;

[0042] The fan duct 5 is provided with:

[0043] The fan 51 is used to provide air intake to the air chamber;

[0044] The measuring and controlling device is used to calculate the internal air volume of the air chamber and compare it with the air intake volume;

[0045] The fan, the static pressure measuring device in the wind chamber, the pressure measuring device before the nozzle and the pressure difference measuring device of the nozzle are connected to the measuring and controlling device at the same time.

[0046] like Figure 2 As shown, in the present invention, the entire fan duct 5, the nozzle duct 4 and the wind chamber 2 are all tightly connected to ensure the accuracy of the wind chamber measurement results.

[0047] like Figure 3 As shown, a fan inlet is provided at one end of the fan duct, and a fan outlet is provided at the other end. The fan outlet is connected to the nozzle duct, the fan inlet is connected to the air, and a fan duct bracket is also provided under the fan duct.

[0048] The nozzle pipe includes a fan connecting part, a pressure measuring part and a wind chamber connecting part. One end of the fan connecting part is connected to the fan outlet, and the other end is connected to the wind chamber connecting part through the pressure measuring part. The pipe cross-sections of the fan connecting part and the wind chamber connecting part are not smaller than the pipe cross-section of the pressure measuring part, and the nozzle pressure difference measuring device is arranged in the pressure measuring part.

[0049] The air chamber includes an air chamber frame, an air chamber skin, an air chamber air inlet and an air chamber air outlet, the air chamber skin is covered on the circumference of the air chamber frame, the air chamber air inlet and the air chamber air outlet are respectively arranged at two ends of the air chamber frame, the air chamber air inlet is connected to the air chamber connecting part, the valve port is arranged at the air chamber air outlet, the cross-section of the air chamber air inlet is smaller than the cross-section of the air chamber outlet, and the cross-section of the air chamber air inlet is larger than the pipe cross-section of the air chamber connecting part.

[0050] In a preferred embodiment, the valve port may also be arranged at the air inlet of the air chamber, and correspondingly, the air outlet of the air chamber is connected to the air chamber connecting part.

[0051] A fixing device is also provided at the valve opening, and the valve of the civil air defense equipment to be tested is fixed at the air outlet of the wind chamber through the fixing device, and the area of ​​the valve of the civil air defense equipment to be tested is not larger than the area of ​​the valve opening.

[0052] The static pressure measuring device in the wind chamber, the pressure measuring device before the nozzle and the pressure difference measuring device in the nozzle are all micro differential pressure transmitters.

[0053] The static pressure measuring device in the wind chamber is arranged in front of the wind chamber air outlet, and the pre-nozzle pressure measuring device is arranged behind the wind chamber air inlet.

[0054] The air chamber is also provided with a pressure stabilizing device, an atmospheric pressure transmitter and a temperature and humidity transmitter. The pressure stabilizing device is arranged between the static pressure measuring device in the air chamber and the pressure measuring device before the nozzle.

[0055] In a specific embodiment, the voltage stabilizing device is a voltage stabilizer composed of a voltage regulating circuit, a control circuit, and a servo motor.

[0056] The measurement and control device includes a strong current module and a weak current module;

[0057] The high-voltage module is used to control the fan, and includes an air switch, a contactor, and a frequency converter. One end of the frequency converter is connected to the air switch through the contactor, and the other end is connected to the fan.

[0058] The weak current module includes a strong current control unit, an instrument power supply unit and a test data acquisition unit. The strong current control unit is connected to the strong current module. The instrument power supply unit is simultaneously connected to the static pressure measuring device in the wind chamber, the pressure measuring device in front of the nozzle and the nozzle pressure difference measuring device; the test data acquisition unit is simultaneously connected to the static pressure measuring device in the wind chamber, the pressure measuring device in front of the nozzle, the nozzle pressure difference measuring device and the fan.

[0059] The utility model also provides an intelligent airtightness detection method for civil air defense equipment, and the airtightness detection method for civil air defense equipment performs airtightness detection on the valve of the civil air defense equipment through the airtightness detection device.

[0060] Embodiment 1:

[0061] The utility model is an intelligent civil air defense equipment tightness detection device. When testing the sealing valve, its testing principle is as follows:

[0062] First of all, the ventilation performance of the closed valve mainly refers to the aerodynamic resistance characteristics of the valve. In general, the valve resistance (expressed by Δp) increases with the increase of the air volume flowing through the valve. The valve resistance coefficient (expressed by ξ) is a dimensionless parameter of the resistance Δp. There is the following relationship between the two:

[0063]

[0064] In formula (1): ρ is the air density, v is the air velocity at the inlet of the closed valve.

[0065] The ventilation performance test of the closed valve is essentially to measure the resistance Δp and resistance coefficient ξ of the valve under different air volumes. From formula (1), to test the ventilation performance of the valve, as shown in Table 1, the following parameters must be measured:

[0066]

[0067]

[0068] Table 1

[0069] Among them, the measurement of valve resistance is as follows:

[0070] There are multiple industry standards for other types of ventilation valves. These standards recommend test equipment for valve ventilation performance testing, but different standards have significant differences in the issue of valve resistance testing.

[0071] In order to increase the uniformity and stability of the air flow field inside the wind chamber, the utility model further adds a voltage stabilizing device.

[0072] The fan selected is a speed-adjustable fan, and its parameters are as follows:

[0073] Air volume Q = 110000m3 / h;

[0074] Pressure P = 1100 Pa;

[0075] Power N = 45kW.

[0076] In the utility model, the test air chamber device adopts a frame structure, and the frame is welded by 60*60 square tubes, which can reduce the weight to the maximum extent and increase the strength. The weight of the whole test device is less than 3.5T.

[0077] The strength of the stroke chamber of the utility model is as follows:

[0078] The material of the wind chamber is Q235 plate with a thickness of 3mm. The outer layer is a frame welded from 60*60*4 square tubes. According to finite element strength analysis and calculation, when the interior of the wind chamber is subjected to a vacuum pressure of 1000Pa, the maximum stress in the local area of ​​the wind chamber is 16.46Mpa, which is 7% of the strength of Q235 material.

[0079] When the utility model is implemented, the surface protection measures of the test device are as follows:

[0080] The protection process of the device is to apply a layer of phosphating primer after the material is unloaded. After welding is completed, apply phosphating primer on the weld and then spray two layers of polyurethane topcoat.

[0081] The measurement and control system used in the utility model is as follows:

[0082] The strong current part is the control circuit of the ventilator, which is mainly composed of air switch, contactor and frequency converter. The weak current part includes three parts: strong current control, instrument power supply and test data acquisition. Strong current control and data acquisition use a customized data acquisition board, which has ten-channel analog input, two-channel analog output, 16-channel switch input and output (input and output can be set) and other functions. It can transmit data with the host computer in Modbus and CAN communication modes. It is a measurement and control function module customized for vehicle ventilation engineering or phase difference product test projects, with the advantages of full functions, small size, strong anti-interference ability, etc. The measuring instruments configured in this utility model are shown in Table 2.

[0083]

[0084] Table 2

[0085] The host computer uses a 15-inch touch-type industrial control integrated computer, which is equipped with an I5 Core processor, 4M memory and a 500G mechanical hard disk, and a capacitive screen that supports multi-touch. The operating system is 32-bit Windows 7, and Office 2010 office software and valve test-specific measurement and control software are installed randomly.

[0086] The usage of the three differential pressure transmitters is shown in Table 3:

[0087]

[0088]

[0089] Table 3

[0090] The calculation method in the measurement and control system of the utility model is to directly perform calculations using existing computer software, and only parameters need to be input. All hardware are existing devices in the prior art, and the software part is not protected in the utility model. The utility model only protects the structure of the entire device and the connection relationship between the structures, as well as the specific hardware settings of the structure.

[0091] After the installation and commissioning of the utility model, the 2M valve was tested for trial operation, which showed stable data, simple and convenient operation, and could meet the design requirements. The test bench was tested on site, and the ventilation performance results were consistent with the system self-test conclusions, and the air tightness results reached the accuracy requirements of the air volume measurement range of 30000m3 / h-110000m3 / h.

[0092] The above is a detailed introduction to an intelligent civil air defense equipment tightness detection device provided by the embodiment of the present application. The description of the above embodiment is only used to help understand the method and core idea of ​​the present application; at the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0093] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" and "comprising" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description of the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be determined by the definition of the attached claims.

[0094] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0095] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0096] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the scope of protection of the claims attached to the present application.

Claims

1. An intelligent airtightness detection device for civil air defense equipment, characterized in that: The airtightness detection equipment comprises: a fan duct, a nozzle duct, a wind chamber and a measurement and control device. One end of the wind chamber is connected to the fan duct through the nozzle duct, and the other end is provided with a valve port, and the valve of the civil air defense equipment to be tested is placed at the valve port; The wind chamber is provided with a static pressure measuring device inside the wind chamber and a pressure measuring device before the nozzle; A nozzle differential pressure measuring device is provided in the nozzle pipeline; A fan is arranged in the fan duct; The fan, the static pressure measuring device in the wind chamber, the pressure measuring device before the nozzle and the pressure difference measuring device of the nozzle are connected to the measuring and controlling device at the same time.

2. The airtightness detection device according to claim 1, characterized in that: A fan air inlet is provided at one end of the fan duct, and a fan air outlet is provided at the other end. The fan air outlet is connected to the nozzle duct, and the fan air inlet is connected to air. A fan duct bracket is also provided below the fan duct.

3. The airtightness detection device according to claim 2, characterized in that: The nozzle pipe includes a fan connecting part, a pressure measuring part and a wind chamber connecting part. One end of the fan connecting part is connected to the fan outlet, and the other end is connected to the wind chamber connecting part through the pressure measuring part. The pipe cross-sections of the fan connecting part and the wind chamber connecting part are not smaller than the pipe cross-section of the pressure measuring part, and the nozzle pressure difference measuring device is arranged in the pressure measuring part.

4. The airtightness detection device according to claim 3, characterized in that: The air chamber includes an air chamber frame, an air chamber skin, an air chamber air inlet and an air chamber air outlet, the air chamber skin is covered on the circumference of the air chamber frame, the air chamber air inlet and the air chamber air outlet are respectively arranged at two ends of the air chamber frame, the air chamber air inlet is connected to the air chamber connecting part, the valve port is arranged at the air chamber air outlet, the cross-section of the air chamber air inlet is smaller than the cross-section of the air chamber outlet, and the cross-section of the air chamber air inlet is larger than the pipe cross-section of the air chamber connecting part.

5. The airtightness detection device according to claim 4, characterized in that: A fixing device is also provided at the valve opening, and the valve of the civil air defense equipment to be tested is fixed at the air outlet of the wind chamber through the fixing device, and the area of ​​the valve of the civil air defense equipment to be tested is not larger than the area of ​​the valve opening.

6. The airtightness detection device according to claim 5, characterized in that: The static pressure measuring device in the wind chamber, the pressure measuring device before the nozzle and the pressure difference measuring device in the nozzle are all micro differential pressure transmitters.

7. The airtightness detection device according to claim 1, characterized in that: The static pressure measuring device in the wind chamber is arranged in front of the wind chamber air outlet, and the pre-nozzle pressure measuring device is arranged behind the wind chamber air inlet.

8. The airtightness detection device according to claim 1, characterized in that: The air chamber is also provided with a pressure stabilizing device, an atmospheric pressure transmitter and a temperature and humidity transmitter. The pressure stabilizing device is arranged between the static pressure measuring device in the air chamber and the pressure measuring device before the nozzle.

9. The airtightness detection device according to claim 1, characterized in that: The measurement and control device includes a strong current module and a weak current module; The high-voltage module is used to control the fan, including an air switch, a contactor and a frequency converter. One end of the frequency converter is connected to the air switch through the contactor, and the other end is connected to the fan. The weak current module includes a strong current control unit, an instrument power supply unit and a test data acquisition unit. The strong current control unit is connected to the strong current module. The instrument power supply unit is simultaneously connected to the static pressure measuring device in the wind chamber, the pressure measuring device in front of the nozzle and the nozzle pressure difference measuring device; the test data acquisition unit is simultaneously connected to the static pressure measuring device in the wind chamber, the pressure measuring device in front of the nozzle, the nozzle pressure difference measuring device and the fan.

10. The airtightness detection device according to claim 3, characterized in that: The air chamber skin is a Q235 plate with a thickness of 2-4 mm, and the air chamber frame is welded from square tubes.

Images