Air leakage detection module and air leakage detection device

Abstract

The utility model relates to an air leakage detection module which comprises a detection main pipe and a detection unit, the detection main pipe is used for being respectively connected with a pipeline to be detected and a fan, and a honeycomb pipe is coaxially embedded in the detection main pipe; the detection unit comprises an air volume sensor, and two ends of an air measuring pipe of the air volume sensor are connected to the detection main pipe and are respectively arranged on two sides of the honeycomb pipe. In addition, the utility model also relates to an air leakage detection device which comprises a fan and the air leakage detection module. According to the utility model, the detection main pipe is provided with the honeycomb pipe and the air volume sensor, the arrangement of the honeycomb pipe enables air flow to pass through very stably at a constant speed, and the air flow in the detection main pipe is represented / calculated by utilizing the air flow in the honeycomb pipe, so that the accuracy of flow detection / calculation can be improved; through cooperation of the honeycomb pipe and the air volume sensor, especially the high-precision air volume sensor, after flow detection data of the air volume sensor are accurately obtained, the air leakage amount of the to-be-detected pipeline can be accurately judged, and the accuracy and reliability of air leakage amount detection of the air pipe are guaranteed.

Description

Technical Field

[0001] The utility model relates to an air leakage detection module and an air leakage detection device equipped with the air leakage detection module. Background Art

[0002] The air leakage test of the pipeline is a very important step in the pipeline acceptance process. It must meet the minimum requirements of the specifications. Otherwise, the air-conditioning system will cause excessive system leakage and serious energy loss during operation. If the air leakage is serious, it will not be able to meet the use requirements.

[0003] The principle of air duct leakage detection is: inject air into a leaking container. When the pressure in the container stabilizes, the air flow rate into the container is equal to the leakage flow rate of the container. At present, the main method is to set a flow meter on the air supply duct to obtain the air leakage of the pipeline to be tested by detecting the air supply flow rate of the air supply duct. This method has the problem of insufficient detection precision and accuracy. Utility Model Content

[0004] The utility model relates to an air leakage detection module and an air leakage detection device equipped with the air leakage detection module, which can at least solve some defects of the prior art.

[0005] The utility model relates to an air leakage detection module, comprising a detection main pipe and a detection unit, wherein the detection main pipe has a first end for connecting with a pipeline to be detected and a second end for connecting with a fan, and a honeycomb tube is coaxially embedded in the detection main pipe; the detection unit comprises an air volume sensor, and both ends of the air measuring tube of the air volume sensor are connected to the detection main pipe and are arranged on both sides of the honeycomb tube.

[0006] As one of the implementation modes, the air volume sensor adopts a high-precision flow meter, wherein the range of the air volume sensor is 0 to 100 slm, and the sensor accuracy is ±1.5% FS.

[0007] As one of the implementation modes, the air volume sensor is installed on the detection main pipe via a sensor bracket.

[0008] As one of the implementation modes, the detection main pipe includes a front pipe section, a honeycomb section and a rear pipe section connected in sequence, the honeycomb pipe is embedded in the honeycomb section, the cross-sections of the front pipe section and the rear pipe section are both annular, and the cross-section of the honeycomb section is honeycomb.

[0009] As one of the implementation modes, two ends of the wind measuring tube are respectively connected to the front pipe section and the rear pipe section.

[0010] The utility model also provides an air leakage detection device, comprising a fan and the air leakage detection module as described above, wherein the fan has an air side air port and a pipeline side air port, and the second end is connected to the pipeline side air port.

[0011] As one of the implementation modes, the air leakage detection device further includes a pressure sensing unit, wherein the pressure sensing unit includes a first pressure sensor for detecting the pressure in the pipeline to be tested and / or a second pressure sensor for detecting the pressure in the test main pipe.

[0012] As one of the embodiments, the air leakage detection device also includes a controller, and the fan, the air volume sensor and the pressure sensing unit are all electrically connected to the controller. The controller is used to obtain the detection signals sent by the air volume sensor and the pressure sensing unit, and control the operation of the fan according to the detection signals.

[0013] The utility model has at least the following beneficial effects: the utility model configures a honeycomb tube and an air volume sensor for the detection main pipe, the arrangement of the honeycomb tube enables the airflow to pass through at a uniform speed and very stably, and the gas flow in the honeycomb tube is used to characterize / calculate the gas flow in the detection main pipe, which can improve the accuracy of flow detection / calculation; by cooperating with the honeycomb tube and the air volume sensor, especially the high-precision air volume sensor, after accurately obtaining the flow detection data of the air volume sensor, the air leakage of the pipeline to be tested can be accurately determined, thereby ensuring the accuracy and reliability of the air duct leakage detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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.

[0015] Figure 1 A schematic diagram of the structure of the air leakage detection device (after removing the box cover) provided by an embodiment of the utility model;

[0016] Figure 2 A schematic diagram of the structure of a detection main pipe provided with a honeycomb pipe and an air volume sensor according to an embodiment of the utility model;

[0017] Figure 3 and Figure 4 A schematic structural diagram of a multi-fan detection device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1

[0020] like Figure 2 The utility model provides an air leakage detection module, including a detection main pipe 11 and a detection unit, wherein the detection main pipe 11 has a first end for connecting to a pipeline to be tested and a second end for connecting to a fan 2, and a honeycomb tube 12 is coaxially embedded in the detection main pipe 11; the detection unit includes an air volume sensor 13, and both ends of the air measuring pipe of the air volume sensor 13 are connected to the detection main pipe 11 and are arranged on both sides of the honeycomb tube 12.

[0021] The circumferential outer edge of the honeycomb tube 12 is in contact with the inner wall of the detection main pipe 11, so that the detection main pipe 11 includes a front pipe section, a honeycomb section and a rear pipe section which are connected in sequence, and the honeycomb tube 12 is embedded in the honeycomb section. The cross-sections of the front pipe section and the rear pipe section are both annular, and the cross-section of the honeycomb section is honeycomb-shaped. In the honeycomb section, the airflow can pass through at a uniform speed and very stably. The gas flow in the honeycomb section is used to characterize / calculate the gas flow in the detection main pipe 11, which can improve the accuracy of flow detection / calculation.

[0022] The two ends of the wind measuring pipe of the wind volume sensor 13 are respectively connected to the front pipe section and the rear pipe section.

[0023] In this embodiment, the air volume sensor 13 adopts a high-precision flow meter, which can improve the accuracy of the air duct leakage detection. In one embodiment, the range of the air volume sensor 13 is 0-100slm, and the sensor accuracy is ±1.5%FS; further, the resolution of the air volume sensor 13 is 0.1%FS. However, it is obviously not limited to selecting the air volume sensor 13 with this parameter, and other high-precision air volume sensors 13 are also applicable to this embodiment.

[0024] The resistance coefficient S1 of the air measuring tube of the air volume sensor 13 and the resistance coefficient S of the honeycomb tube 12 are obtained in advance. 大 , when conducting flow detection,

[0025] ΔP 大 =S 大 Q 大 n大

[0026]

[0027] because:

[0028] ΔP 大 =ΔP1

[0029] therefore:

[0030]

[0031] Wherein, Q is the flow rate at the first end / second end of the detection main pipe 11; Q1 is the flow rate of the wind measuring pipe, that is, the flow rate detected by the wind volume sensor 13; Q 大 is the flow rate of the honeycomb segment; ΔP 大 is the pressure loss in the detection pipe 11, in Pa; ΔP1 is the pressure loss in the wind pipe of the air volume sensor 13, in Pa; Q 大 is the flow rate of the main pipe 11; Q1 is the flow rate of the wind pipe; n1 and n 大 are the fitting coefficients.

[0032] It can be seen that after accurately obtaining the flow detection data of the air volume sensor 13, the total flow rate flowing through the detection main pipe 11 can be calculated, so that the air leakage volume of the pipeline to be tested can be accurately determined.

[0033] Preferably, the air volume sensor 13 is mounted on the detection main pipe 11 via a sensor bracket.

[0034] Embodiment 2

[0035] like Figure 1-Figure 4 An embodiment of the utility model provides an air leakage detection device, comprising a fan 2 and an air leakage detection module provided in the above-mentioned embodiment 1, wherein the fan 2 has an air side air outlet and a duct side air outlet, and the second end is connected to the duct side air outlet.

[0036] The fan 2 is generally a blower.

[0037] In one embodiment, the fan 2 is a reversible fan, for example, the motor of the fan 2 is a reversible motor. Based on this solution, the fan 2 can blow air into the detection main pipe 11 and the pipeline to be tested, and can also extract air from the detection main pipe 11 and the pipeline to be tested. Therefore, in this embodiment, the air duct leakage detection under positive pressure state and the air duct leakage detection under negative pressure state can be realized. In particular, the combination of the two detection modes can effectively improve the accuracy of the air duct leakage detection. The specific detection method will be described in Example 3.

[0038] The fan 2 has a duct side air port and an air side air port. Taking the forward rotation of the fan 2 as an example, when the fan 2 rotates forward, the duct side air port constitutes the air outlet of the fan 2, and the air side air port constitutes the air inlet of the fan 2; when the fan 2 rotates reversely, the duct side air port constitutes the air inlet of the fan 2, and the air side air port constitutes the air outlet of the fan 2.

[0039] Further preferably, the air leakage detection device further comprises a pressure sensing unit, and the pressure sensing unit comprises a first pressure sensor for detecting the pressure in the pipeline to be tested and / or a second pressure sensor for detecting the pressure in the test main pipe 11. By obtaining the pressure detection data of the pressure sensing unit in real time, it is possible to determine whether the pressure in the pipeline to be tested is stable, thereby controlling the operation of the fan 2 and performing the collection and analysis of the air leakage data; when the stability of the pipeline to be tested is determined in combination with the pressure detection data and the flow detection data, the accuracy of the analysis and judgment and the accuracy of the air duct leakage detection can be improved.

[0040] The pressure measuring point in the detection main pipe 11 may be arranged in the front pipe section and / or the rear pipe section.

[0041] Further preferably, the above-mentioned air leakage detection device also includes a controller, and the fan 2, the air volume sensor 13 and the pressure sensing unit are all electrically connected to the controller, and the controller is used to obtain the detection signals sent by the air volume sensor 13 and the pressure sensing unit, and control the operation of the fan 2 according to the detection signals, such as controlling the fan speed, controlling the forward and reverse rotation of the fan 2, etc.

[0042] In one embodiment, if Figure 1 The above-mentioned air leakage detection device also includes a detection box 1, and the fan 2, the detection main pipe 11 and the air volume sensor 13 are all arranged in the detection box 1.

[0043] In this embodiment, the fan 2, the detection main pipe 11 and other devices are integrated in a detection box 1, and the equipment integration is high. It only needs to connect the main interface 111 of the detection box 1 to the pipeline to be tested. The operation is convenient and fast, and has high operational flexibility.

[0044] A vent is provided on the detection box 1 , and the vent is relatively connected to the air side vent of the fan 2 , serving as an air inlet channel / air outlet channel of the fan 2 .

[0045] In one embodiment, if Figure 3 and Figure 4, there are multiple fans 2, and the air outlets of the multiple fans 2 are connected to the second end. Multiple fans 2 can work simultaneously, or some fans 2 can be selected to work; for example, before the pressure of the pipeline to be tested is stable, the air supply efficiency and detection efficiency can be improved by having all fans 2 work simultaneously, and after the pressure of the pipeline to be tested is stable, some fans 2 are selected to work, which can improve the detection accuracy. As an optional embodiment, each fan 2 includes fans with two or more parameters, so as to meet different detection requirements, or after the pressure of the pipeline to be tested is stable, fans 2 with different parameters are selected to work, which can improve the richness and reliability of the leakage detection data.

[0046] In particular, in the present embodiment, since the fan 2 is integrated in the detection box 1, it is preferred to use a small fan 2, for example, the power of the fan 2 is in the range of 1000-3600w, and the rotation speed is in the range of 10000-20000r / min; based on this situation, after the pressure in the pipeline to be tested is stabilized, using a small fan 2 to supply air to the pipeline to be tested can better match the leakage flow rate, and can effectively improve the accuracy and precision of leakage detection.

[0047] In one embodiment, if Figure 3 and Figure 4 The fan 2 includes a fan body 22 and a wind bin arranged in the detection box 1, the wind bin includes a base 21 with a first inner cavity 211, one side of the base 21 is open and the other side is provided with an air side air outlet connected to the first inner cavity 211, the fan body 22 includes an impeller cover 221 with a second inner cavity, an impeller arranged in the impeller cover 221 and a driving unit 222 connected to the impeller, the impeller cover 221 is covered on the open surface of the base 21, and the first inner cavity 211 is relatively connected to the second inner cavity to form a wind cavity.

[0048] The impeller cover 221 is also an open structure, so that the open surface of the impeller cover 221 is connected to the open surface of the base 21 to form a closed air cavity. The impeller cover 221 and the base 21 are preferably detachably connected, including but not limited to screw fixing sealing, and the connection between the two is preferably sealed to reduce unnecessary air leakage.

[0049] Among them, an opening may be formed on the side wall of the base 21 to form a duct side air outlet of the fan. Figure 3 and Figure 4The above-mentioned air bin also includes a ventilation pipe 23, which is communicated with the first inner cavity 211 and connected to the second end of the detection main pipe 11. The ventilation pipe 23 is preferably formed integrally with the base 21, or the ventilation pipe 23 includes a first pipe flap and a second pipe flap, wherein the first pipe flap is formed integrally with the base 21, and the second pipe flap is detachably connected to the first pipe flap and encloses the pipe cavity of the ventilation pipe 23; based on this solution, the structural tightness of the fan 2 can be improved, thereby improving the accuracy of air leakage detection.

[0050] Based on the above solution, the conventional fan structure is designed as a structure in which the base 21 and the impeller cover 221 are separately connected, avoiding the use of a large fan housing and facilitating the miniaturization design of the air leakage detection device.

[0051] like Figure 3 and Figure 4 In the case where there are multiple fans 2, the bases 21 of the fans 2 are preferably integrally formed, that is, they share a common base 21 / wind chamber, and multiple first inner cavities 211 are arranged on the common base 21, and the fan bodies 22 are installed in the first inner cavities 211 one by one. This can facilitate the installation of multiple fans 2, realize the integrated installation of the fans 2, and further facilitate the miniaturized design of the air leakage detection device; in particular, Figure 3 and Figure 4 When the ventilation pipe 23 is fully or partially formed integrally with the base 21, it is also convenient to arrange the ventilation pipes 23 of each fan 2 in parallel, thereby improving the structural integrity and sealing of the ventilation pipeline and reducing unnecessary air leakage points.

[0052] Preferably, a display screen is provided on the detection box 1, and the display screen is electrically connected to the above-mentioned controller, and can display the detection data of the air volume sensor 13, the pressure sensing unit, etc., the working state of the fan 2, the air leakage detection data, etc. in real time; the display screen can further be a touch screen, which is convenient for the staff to perform corresponding operations and improve the efficiency and effect of human-computer interaction. In addition, a control switch can be set on the detection box 1.

[0053] Embodiment 3

[0054] This embodiment provides a method for detecting air duct leakage. The detection principle is: inject air into a leaking container. When the pressure in the container is stable, the air flow rate sent into the container is equal to the leakage flow rate of the container. This method is implemented based on the above-mentioned air leakage detection device. The method specifically includes:

[0055] S1, connecting the air leakage detection device to the pipeline to be tested, that is, connecting the detection main pipe 11 to the pipeline to be tested;

[0056] S2, supply air to the pipeline to be tested until the pressure in the pipeline to be tested stabilizes at the preset pressure P 100 ;

[0057] S3, keep the pressure in the pipeline to be tested stable at the preset pressure P 100 , control the air leakage detection device to continue to supply air to the pipeline to be tested; obtain the air supply flow rate Q of the air leakage detection device 稳1 , according to the air flow rate Q 稳1 Get the air leakage Q of the pipeline to be tested 100 .

[0058] Among them, in S2, a large fan can be used to supply air to the pipeline to be tested, or the leakage detection device can be used to supply air to the pipeline to be tested. When the pipeline to be tested has multiple vents (the vents can be air inlets, air outlets, etc.), using multiple leakage detection devices to simultaneously supply air to the pipeline to be tested can significantly improve the test efficiency and avoid the use of large fans; in this case, in S3, one or several leakage detection devices are selected to continue to supply air to the pipeline to be tested, which can improve the accuracy of leakage detection, and also improve the richness and reliability of test data (for example, in S3, the number of leakage detection devices supplying air to the pipeline to be tested is successively reduced to obtain multiple groups of air supply flow rates Q 稳1 , this can ensure the accuracy and reliability of air leakage detection).

[0059] Among them, in S2 and S3, the pressure in the pipeline to be tested and the air supply flow rate of the air leakage detection device are obtained in real time to control the operation of the fan 2. This has been described in the above embodiment 1 and is omitted here.

[0060] Preferably, in S3, the air leakage detection device is controlled to continue to supply air to the pipeline to be tested for a certain period of time, for example, within the range of 3 to 10 minutes, and multiple groups of air flow rates Q are obtained during this period of time. 稳1 ', for the multiple groups of air flow rates Q 稳1 'Find the average value to get the Q 稳1 , which can effectively reduce the test error.

[0061] Preferably, in S3, the controller obtains the air duct leakage volume Q 100 Compare with the preset standard to determine whether the air leakage condition of the pipeline to be tested is qualified.

[0062] In one embodiment, the above-mentioned air duct leakage detection method further includes:

[0063] S4, control the fan 2 of the air leakage detection device to reverse and exhaust air from the pipeline to be tested until the pipeline to be tested has a negative pressure and the pressure is stable at a preset pressure P 200 ;

[0064] S5, keep the pressure in the pipeline to be tested stable at the preset pressure P 200, control the air leakage detection device to continue to evacuate the pipeline to be tested; obtain the exhaust flow rate Q of the air leakage detection device 稳2 , according to the exhaust flow rate Q 稳2 Get the air leakage Q of the pipeline to be tested 200 ;

[0065] S6, cycle through S2 to S5 to obtain the air leakage volume Q of N groups of air ducts 100 And N groups of duct leakage Q 200 , the air leakage volume Q of the N groups of air ducts 100 And N groups of duct leakage Q 200 Calculate the average value to get the duct leakage Q of the pipeline to be tested 300 , the air leakage volume Q of the air duct 300 The output is the measured duct leakage.

[0066] The leakage detection method under the exhaust condition can refer to the leakage detection method under the air supply condition. For example, in S5, the leakage detection device is controlled to continue to extract air from the pipeline to be tested within a set time, for example, within a range of 3 to 10 minutes. Within this time period, multiple sets of exhaust flow rates Q are obtained. 稳2 ', for the multiple groups of exhaust flow Q 稳2 'Find the average value to get the Q 稳2 , which can effectively reduce the test error; the other steps are not described here one by one.

[0067] Preferably, in S5, the obtained air duct leakage volume Q 200 Compare with the preset standard to determine whether the air leakage condition of the pipeline to be tested is qualified.

[0068] Similarly, in S6, the air duct leakage volume Q 300 Compare with the preset standard to determine whether the air leakage condition of the pipeline to be tested is qualified.

[0069] Based on this method, the air leakage data of the pipeline to be tested under positive and negative pressure states are obtained, which can significantly improve the accuracy and reliability of the duct leakage test.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air leakage detection module, characterized in that: The invention comprises a detection main pipe and a detection unit. The detection main pipe has a first end for connecting to a pipeline to be tested and a second end for connecting to a fan. A honeycomb tube is coaxially embedded in the detection main pipe. The detection unit comprises an air volume sensor. Both ends of the air measuring tube of the air volume sensor are connected to the detection main pipe and are arranged on both sides of the honeycomb tube.

2. The air leakage detection module according to claim 1, characterized in that: The air volume sensor adopts a high-precision flow meter, wherein the range of the air volume sensor is 0-100slm and the sensor accuracy is ±1.5%FS.

3. The air leakage detection module according to claim 1, characterized in that: The air volume sensor is installed on the detection main pipe through a sensor bracket.

4. The air leakage detection module according to claim 1, characterized in that: The detection main pipe comprises a front pipe section, a honeycomb section and a rear pipe section connected in sequence, the honeycomb pipe is embedded in the honeycomb section, the cross sections of the front pipe section and the rear pipe section are both annular, and the cross section of the honeycomb section is honeycomb.

5. The air leakage detection module according to claim 4, characterized in that: Two ends of the wind measuring tube are respectively connected to the front pipe section and the rear pipe section.

6. An air leakage detection device, characterized in that: It comprises a fan and an air leakage detection module as described in any one of claims 1 to 5, wherein the fan has an air side air outlet and a duct side air outlet, and the second end is connected to the duct side air outlet.

7. The air leakage detection device according to claim 6, characterized in that: The invention also comprises a pressure sensing unit, wherein the pressure sensing unit comprises a first pressure sensor for detecting the pressure in the pipeline to be tested and / or a second pressure sensor for detecting the pressure in the test main pipe.

8. The air leakage detection device according to claim 7, characterized in that: It also includes a controller, and the fan, the air volume sensor and the pressure sensing unit are all electrically connected to the controller. The controller is used to obtain detection signals sent by the air volume sensor and the pressure sensing unit, and control the operation of the fan according to the detection signals.

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