Integrated air leakage detection device

Abstract

The utility model relates to an integrated air leakage detection device, which comprises a detection box body, a fan and an air leakage detection module, the fan and the air leakage detection module are both arranged in the detection box body, a first port of the air leakage detection module, which is used for being connected with a pipeline to be detected, extends out of the detection box body, and a second port of the air leakage detection module, which is used for being connected with a pipeline to be detected, extends out of the detection box body. The fan is provided with an air side air opening and a pipeline side air opening connected with the second port of the air leakage amount detection module, and the detection box body is provided with a ventilation opening oppositely communicated with the air side air opening. According to the utility model, the fan, the air leakage detection module and other devices are integrated in the detection box body, the equipment integration level is high, only the main interface of the detection box body needs to be connected with the to-be-detected pipeline, the operation is convenient and rapid, and the operation flexibility is high; the detection box body can well protect the air leakage detection module, protection measures do not need to be additionally configured for the air leakage detection module, and the detection cost is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of air duct leakage detection, and specifically relates to an integrated air leakage detection device. 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 duct leakage detection is to inject air into a leaking container. When the pressure in the container stabilizes, the air flow rate sent into the container is equal to the leakage flow rate of the container. The equipment used for duct leakage detection mainly includes fans and leakage detection modules. Fans and leakage detection modules are generally purchased and stored separately, and transported to the site for assembly. The operation is not convenient and efficient. In particular, the leakage detection module is an instrument with a certain degree of precision, and the storage and transportation costs are relatively high. Utility Model Content

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

[0005] The utility model relates to an integrated air leakage detection device, comprising a detection box, a fan and an air leakage detection module, wherein the fan and the air leakage detection module are both arranged in the detection box, a first port of the air leakage detection module for connecting to a pipeline to be tested extends out of the detection box, the fan has an air side air port and a pipeline side air port connected to a second port of the air leakage detection module, and a ventilating port relatively connected to the air side air port is opened on the detection box.

[0006] As one of the implementation modes, a controller is further provided in the detection box, and the fan and the air leakage detection module are both electrically connected to the controller.

[0007] As one of the implementation modes, a display screen is provided on the detection box, and the display screen is electrically connected to the controller.

[0008] As one of the implementation modes, the fan is a forward and reverse rotatable fan.

[0009] As one of the implementation modes, there are multiple fans, and the pipeline side air outlets of the multiple fans are all connected to the second port.

[0010] As one of the implementation modes, the air leakage detection module includes a detection main pipe, two ends of which constitute the first port and the second port, and the detection main pipe is provided with an air volume sensor for detecting its flow rate.

[0011] As one of the implementation modes, the detection main pipe includes a front pipe section, an average speed section and a rear pipe section connected in sequence, and both ends of the wind measuring pipe of the air volume sensor are connected to the detection main pipe and arranged on both sides of the average speed section.

[0012] As one of the implementation modes, a honeycomb tube is coaxially embedded in the uniform velocity section.

[0013] As one of the implementation modes, the cross-sections of the front pipe section and the rear pipe section are both annular, and the cross-section of the honeycomb tube is honeycomb-shaped.

[0014] As one of the implementation modes, a handle is provided on the detection box.

[0015] The utility model has at least the following beneficial effects: in the utility model, devices such as the fan and the air leakage detection module are integrated in the detection box, and the equipment integration is high. It only needs to connect the main interface of the detection box (that is, the first port of the air leakage detection module) to the pipeline to be tested, which is convenient and quick to operate and has high operational flexibility. The detection box can better protect the air leakage detection module, and there is no need to configure additional protection measures for the air leakage detection module, which effectively reduces the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 A schematic diagram of the structure of the integrated air leakage detection device (after removing the box cover) provided in an embodiment of the utility model;

[0018] 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;

[0019] 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

[0020] 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.

[0021] Embodiment 1

[0022] like Figure 1 An embodiment of the utility model provides an integrated air leakage detection device, including a detection box 1, a fan 2 and an air leakage detection module, wherein the fan 2 and the air leakage detection module are both arranged in the detection box 1, and a first port 111 of the air leakage detection module for connecting to a pipeline to be tested extends out of the detection box 1, the fan 2 has an air side air port and a pipeline side air port connected to the second port of the air leakage detection module, and a ventilation port relatively connected to the air side air port is opened on the detection box 1.

[0023] In this embodiment, the fan 2, the air leakage detection module and other devices are integrated in the detection box 1, and the equipment integration is high. It only needs to connect the main interface of the detection box 1 (that is, the first port 111 mentioned above) to the pipeline to be tested. The operation is convenient and fast, and it has high operational flexibility. The detection box 1 can better protect the air leakage detection module, and there is no need to configure additional protection measures for the air leakage detection module, which effectively reduces the detection cost.

[0024] The fan 2 is generally a blower.

[0025] Preferably, the air leakage detection module comprises a detection main pipe 11 , two ends of which constitute the first port 111 and the second port, and the detection main pipe 11 is provided with an air volume sensor 13 for detecting its flow rate.

[0026] In one embodiment, the detection main pipe 11 includes a front pipe section, a constant speed section and a rear pipe section connected in sequence, and the two ends of the wind measuring pipe of the air volume sensor 13 are connected to the detection main pipe 11 and are arranged on both sides of the constant speed section. The detection main pipe 11 is equipped with a constant speed section, and the air flow can pass through the constant speed section at a uniform speed and very stably. The gas flow in the detection main pipe is characterized / calculated by the gas flow in the constant speed section, which can improve the accuracy of flow detection / calculation; by cooperating with the constant speed section and the air volume sensor 13, especially the high-precision air volume sensor 13, after accurately obtaining the flow detection data of the air volume sensor 13, the air leakage of the pipeline to be tested can be accurately determined, ensuring the accuracy and reliability of air leakage detection.

[0027] More preferably, if Figure 2A honeycomb tube 12 is coaxially embedded in the average speed section, which can obtain a very good average speed effect and further improve the accuracy of air leakage detection. Preferably, the cross-sections of the front tube section and the rear tube section are both annular, and the cross-section of the honeycomb tube 12 is honeycomb.

[0028] In this embodiment, the air volume sensor 13 uses a high-precision flow meter to improve the accuracy of air leakage detection. In one embodiment, the air volume sensor 13 has a range of 0 to 100 slm and a sensor accuracy of ±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.

[0029] 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,

[0030] ΔP 大 =S 大 Q 大 n大

[0031]

[0032] because:

[0033] ΔP 大 =ΔP1

[0034] therefore:

[0035]

[0036] 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 tube 12; 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.

[0037] 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.

[0038] 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 detection 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 air leakage data; when the stability of the pipeline to be tested is determined by combining the pressure detection data and the flow detection data, the accuracy of the analysis and judgment and the accuracy of the air leakage detection can be improved.

[0039] The pressure measuring point in the detection main pipe 11 may be arranged in the front pipe section and / or the rear pipe section.

[0040] Further preferably, the air leakage detection device further includes a controller, and the fan 2 and the air leakage detection module are both electrically connected to the controller. When a pressure sensing unit is provided, the pressure sensing unit is also electrically connected to the controller. The controller is used to obtain the detection signal sent by the air leakage detection module, and control the operation of the fan 2 according to the detection signal, such as controlling the fan speed, controlling the forward and reverse rotation of the fan 2, etc. The controller is preferably arranged in the detection box 1 to further improve the integration of the air leakage detection device.

[0041] 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 air leakage detection module and the pipeline to be tested, and can also extract air from the air leakage detection module and the pipeline to be tested. Therefore, in this embodiment, air leakage detection under positive pressure state and air leakage detection under negative pressure state can be realized, especially the combination of the two detection modes can effectively improve the accuracy of air leakage detection.

[0042] 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 port. Multiple fans 2 can work at the same time, 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 at the same time, 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 4 The above-mentioned air bin also includes a ventilation pipe 23, which is communicated with the first inner cavity 211 and connected to the second port 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 airtightness of the fan 2 can be improved, thereby improving the accuracy of air leakage detection.

[0047] 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, thereby avoiding the use of a large fan housing and facilitating the miniaturization design of the air leakage detection device.

[0048] like Figure 3 and Figure 4In 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.

[0049] 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.

[0050] In addition, if Figure 1 A handle can be provided on the detection box 1, which is highly portable.

[0051] Embodiment 2

[0052] The embodiment of the utility model provides an air leakage detection method, 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.

[0053] In this embodiment, the above method is implemented based on the air leakage detection device provided in the above embodiment 1. The method specifically includes:

[0054] 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;

[0055] 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 ;

[0056] 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 .

[0057] 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).

[0058] 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.

[0059] 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.

[0060] Preferably, in S3, the controller obtains the air leakage volume Q 100 Compare with the preset standard to determine whether the air leakage condition of the pipeline to be tested is qualified.

[0061] In one embodiment, the air leakage detection method further includes:

[0062] 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 ;

[0063] 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 ;

[0064] S6, cycle through S2 to S5 to obtain N groups of air leakage Q 100 And N group air leakage Q 200 , for the N groups of air leakage Q100 And N group air leakage Q 200 Calculate the average value to get the air leakage Q of the pipeline to be tested 300 , the air leakage volume Q 300 The output is the measured air leakage volume.

[0065] 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.

[0066] Preferably, in S5, the air leakage amount Q 200 Compare with the preset standard to determine whether the air leakage condition of the pipeline to be tested is qualified.

[0067] Similarly, in S6, the air leakage volume Q 300 Compare with the preset standard to determine whether the air leakage condition of the pipeline to be tested is qualified.

[0068] Based on this method, the air leakage data of the pipeline under positive pressure and negative pressure are obtained, which can significantly improve the accuracy and reliability of the air leakage test.

[0069] 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 integrated air leakage detection device, characterized in that: It includes a detection box, a fan and an air leakage detection module, wherein the fan and the air leakage detection module are both arranged in the detection box, a first port of the air leakage detection module for connecting to the pipeline to be tested extends out of the detection box, the fan has an air side air port and a pipeline side air port connected to the second port of the air leakage detection module, and a ventilation port relatively connected to the air side air port is opened on the detection box.

2. The integrated air leakage detection device according to claim 1, characterized in that: A controller is also provided in the detection box, and the fan and the air leakage detection module are both electrically connected to the controller.

3. The integrated air leakage detection device according to claim 2, characterized in that: The detection box is provided with a display screen, and the display screen is electrically connected to the controller.

4. The integrated air leakage detection device according to claim 1, characterized in that: The fan is a forward and reverse rotatable fan.

5. The integrated air leakage detection device according to claim 1 or 4, characterized in that: There are multiple fans, and the pipeline side air outlets of the multiple fans are all connected to the second port.

6. The integrated air leakage detection device according to claim 1, characterized in that: The air leakage detection module includes a detection main pipe, two ends of which constitute the first port and the second port, and the detection main pipe is equipped with an air volume sensor for detecting its flow rate.

7. The integrated air leakage detection device according to claim 6, characterized in that: The detection main pipe comprises a front pipe section, an average speed section and a rear pipe section which are connected in sequence. Both ends of the wind measuring pipe of the air volume sensor are connected to the detection main pipe and are arranged on both sides of the average speed section.

8. The integrated air leakage detection device according to claim 7, characterized in that: A honeycomb tube is coaxially embedded in the uniform velocity section.

9. The integrated air leakage detection device according to claim 8, characterized in that: The cross sections of the front pipe section and the rear pipe section are both annular, and the cross section of the honeycomb tube is honeycomb-shaped.

10. The integrated air leakage detection device according to claim 1, characterized in that: The detection box body is provided with a handle.

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