Multi-fan type air leakage detection device

Abstract

The utility model relates to a multi-fan type air leakage detection device which comprises an air leakage detection module and a plurality of fans. The draught fan comprises a draught fan body and a base with a first inner cavity, one face of the base is open, the other face of the base is provided with an air side air opening communicated with the first inner cavity, the draught fan body comprises an impeller cover with a second inner cavity, an impeller arranged in the impeller cover and a driving unit connected with the impeller, and the impeller cover covers the open face of the base. The first inner cavity and the second inner cavity are oppositely communicated to form an air cavity; an opening is formed in the side wall of the base to form pipeline side air openings, and all the pipeline side air openings communicate with the air leakage amount detection module. The air supply efficiency and the detection efficiency can be improved by adopting the multiple fans, and after the pressure of the to-be-detected pipeline is stable, part of the fans are selected to work, so that the detection precision can be improved; a conventional fan structure is designed into a structure that the base and the impeller cover are connected in a split mode, the situation that a large fan shell is adopted is avoided, and miniaturization design of the air leakage detection device is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of air duct leakage detection, and in particular relates to a multi-fan type 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: inject air into a leaking container, and 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. Among them, fans are generally used for air supply. For air leakage test of large pipelines such as central air conditioning pipelines, large fans are usually used. On the one hand, a large equipment space is required. On the other hand, after the pressure in the pipeline to be tested is stabilized, when a large fan is used to supply air for air leakage detection, there is a problem of low accuracy. Utility Model Content

[0004] The utility model relates to a multi-fan type air leakage detection device, which can at least solve some defects of the prior art.

[0005] The utility model relates to an air leakage detection device, comprising an air leakage detection module and a plurality of fans, wherein the air leakage detection module has a first port and a second port for connecting to a pipeline to be tested; the fan comprises a fan body and a base having a first inner cavity, one side of the base is open and the other side is provided with an air side air outlet connected to the first inner cavity, the fan body comprises an impeller cover having a second inner cavity, an impeller arranged in the impeller cover and a drive unit connected to the impeller, the impeller cover is covered on the open surface of the base, the first inner cavity is relatively connected to the second inner cavity to form an air cavity; an opening is formed on the side wall of the base to form a pipeline side air outlet, and each of the pipeline side air outlets is connected to the first port.

[0006] As one of the implementation modes, the fans share a common base, a plurality of first inner cavities are arranged on the common base, and the fan bodies are installed in the first inner cavities in a one-to-one correspondence.

[0007] As one of the implementation modes, the fan further includes a ventilation pipe, and the ventilation pipe is communicated with the first inner cavity and connected with the first port.

[0008] As one of the implementation modes, the ventilation duct and the base are integrally formed.

[0009] As one of the embodiments, the ventilation duct includes a first tube flap and a second tube flap, wherein the first tube flap is integrally formed with the base, and the second tube flap is detachably connected to the first tube flap and encloses a tube cavity to form the ventilation duct.

[0010] As one of the implementation modes, the impeller cover and the base are detachably connected.

[0011] As one of the implementation modes, the air leakage detection device further includes a detection box, and the air leakage detection module and each of the fans are disposed in the detection box.

[0012] As one of the implementation modes, a plurality of ventilation holes are opened on the detection box body, and each of the ventilation holes is relatively connected with each of the air side air outlets one by one.

[0013] The utility model has at least the following beneficial effects:

[0014] In the utility model, multiple fans are used, and the multiple fans can work simultaneously, or some of the fans can be selected to work; for example, before the pressure of the pipeline to be tested is stable, the air supply efficiency and the detection efficiency can be improved by having all the fans work simultaneously. After the pressure of the pipeline to be tested is stable, some of the fans are selected to work, which can improve the detection accuracy.

[0015] In the utility model, the conventional fan structure is designed as a structure in which the base and the impeller cover are separately connected, thereby avoiding the use of a large fan housing and facilitating the miniaturized design of the air leakage detection device. 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 air leakage detection device (after removing the box cover) provided by 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 air leakage 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 3 and Figure 4 The utility model provides a multi-fan air leakage detection device, including an air leakage detection module and multiple fans 2, the air leakage detection module having a first port and a second port 111 for connecting to a pipeline to be tested; the fan 2 comprises a fan body 22 and a base 21 having 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 comprises an impeller cover 221 having a second inner cavity, an impeller arranged in the impeller cover 221 and a drive unit 222 connected to the impeller, the impeller cover 221 is covered on the open surface of the base 21, the first inner cavity 211 is relatively connected to the second inner cavity to form an air cavity; an opening is formed on the side wall of the base 21 to form a pipeline side air outlet, and each of the pipeline side air outlets is connected to the first port.

[0023] The impeller cover 221 is also an open structure, so that the open surface of the impeller cover 221 is connected with the open surface of the base 21 to form a closed air cavity.

[0024] The impeller cover 221 and the base 21 are preferably detachably connected, including but not limited to a screw-fixed sealing method, and the connection between the two is preferably sealed to reduce unnecessary air leakage.

[0025] Furthermore, if Figure 3 and Figure 4 The fan 2 further includes a ventilation pipe 23, which is in communication with the first inner cavity 211 and connected to the first port. The ventilation pipe 23 is preferably formed integrally with the base 21, or the ventilation pipe 23 includes a first tube flap and a second tube flap, wherein the first tube flap is formed integrally with the base 21, and the second tube flap is detachably connected to the first tube flap and encloses the tube 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.

[0026] 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.

[0027] In one embodiment, if Figure 3 and Figure 4 The base 21 of each fan 2 is preferably integrally formed, that is, a common base 21 / wind chamber is shared, a plurality of first inner cavities 211 are arranged on the common base 21, and each fan body 22 is installed in each first inner cavity 211 in a one-to-one correspondence, so that the installation of multiple fans 2 can be facilitated, the integrated installation of each fan 2 can be realized, and the miniaturized design of the air leakage detection device can be further facilitated; in particular, if 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.

[0028] In this embodiment, multiple fans 2 are used. 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 working all fans 2 at the same time. 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.

[0029] In one embodiment, if Figure 1 The air leakage detection device further comprises a detection box 1, wherein the air leakage detection module and each of the fans 2 are arranged in the detection box 1. In this embodiment, the fans 2 and the air leakage detection module and other devices are integrated in a detection box 1, and the device has a high degree of integration. It is only necessary to connect the main interface 111 of the detection box 1 to the pipeline to be tested, which is convenient and fast to operate, and has high operational flexibility.

[0030] Preferably, a plurality of ventilation openings are provided on the detection box body 1 , and each ventilation opening is relatively connected with each air side air outlet one by one to serve as an air inlet channel / air outlet channel of the fan 2 .

[0031] 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.

[0032] 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 leakage detection module and the pipeline to be tested, and can also extract air from the leakage detection module and the pipeline to be tested. Therefore, in this embodiment, the air duct leakage detection under positive pressure and the air duct leakage detection under negative pressure can be realized, especially the combination of the two detection modes can effectively improve the accuracy of the air duct leakage detection. Taking the forward rotation of the fan 2 as the blowing mode as an example, when the fan 2 rotates forward, the duct side air outlet constitutes the air outlet of the fan 2, and the air side air outlet constitutes the air inlet of the fan 2; when the fan 2 reverses, the duct side air outlet constitutes the air inlet of the fan 2, and the air side air outlet constitutes the air outlet of the fan 2.

[0033] In one embodiment, if Figure 2 The air leakage detection module includes a detection main pipe 11 and a detection unit. The two ends of the detection main pipe 11 are configured as a first port and a second port 111. A honeycomb tube 12 is coaxially embedded in the detection main pipe 11. The detection unit includes an air volume sensor 13. The two 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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,

[0038] ΔP 大 =S 大 Q大 n大

[0039] ΔP1=S1Q1 n1

[0040] because:

[0041] ΔP 大 =ΔP1

[0042] therefore:

[0043]

[0044] 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.

[0045] 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.

[0046] Preferably, the air volume sensor 13 is mounted on the detection main pipe 11 via a sensor bracket.

[0047] Further preferably, the detection unit further includes a pressure sensing unit, and 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 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 by combining 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.

[0048] The pressure measuring point in the detection main pipe 11 may be arranged in the front pipe section and / or the rear pipe section.

[0049] 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.

[0050] Embodiment 2

[0051] The embodiment of the utility model provides a method for detecting air duct leakage, the detection principle of which is: injecting air into a leaking container, and when the pressure in the container is stabilized, the air flow rate sent into the container is equal to the leakage flow rate of the container.

[0052] 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:

[0053] 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;

[0054] 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 ;

[0055] 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 .

[0056] 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).

[0057] 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.

[0058] 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.

[0059] 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.

[0060] In one embodiment, the above-mentioned air duct leakage detection method further includes:

[0061] 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 ;

[0062] 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 ;

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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. A multi-fan type air leakage detection device, characterized in that: It includes an air leakage detection module and multiple fans, the air leakage detection module has a first port and a second port for connecting to a pipeline to be tested; the fan includes a fan body and a base with a first inner cavity, one side of the base is open and the other side is provided with an air side air outlet connected to the first inner cavity, the fan body includes an impeller cover with a second inner cavity, an impeller arranged in the impeller cover and a drive unit connected to the impeller, the impeller cover is covered on the open surface of the base, the first inner cavity and the second inner cavity are relatively connected to form an air cavity; an opening is formed on the side wall of the base to form a pipeline side air outlet, and each of the pipeline side air outlets is connected to the first port.

2. The multi-fan type air leakage detection device according to claim 1, characterized in that: The fans share a common base, a plurality of first inner cavities are arranged on the common base, and the fan bodies are installed in the first inner cavities in a one-to-one correspondence.

3. The multi-fan type air leakage detection device according to claim 1, characterized in that: The fan further includes a ventilation pipe, which is in communication with the first inner cavity and connected to the first port.

4. The multi-fan type air leakage detection device according to claim 3, characterized in that: The ventilation pipe is integrally formed with the base.

5. The multi-fan type air leakage detection device according to claim 3, characterized in that: The ventilation tube comprises a first tube flap and a second tube flap, wherein the first tube flap is integrally formed with the base, and the second tube flap is detachably connected to the first tube flap and encloses a tube cavity to form the ventilation tube.

6. The multi-fan type air leakage detection device according to claim 1, characterized in that: The impeller cover is detachably connected to the base.

7. The multi-fan type air leakage detection device according to claim 1, characterized in that: It also includes a detection box, in which the air leakage detection module and each of the fans are arranged.

8. The multi-fan type air leakage detection device according to claim 7, characterized in that: A plurality of ventilation holes are provided on the detection box body, and each of the ventilation holes is relatively connected with each of the air side air outlets one by one.

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