Test device

Abstract

The utility model relates to the technical field of air tightness detection, in particular to test equipment. The testing device is used for detecting the ventilation volume of the ventilation part. The test equipment comprises a sealing shell, a gas supply acquisition module, a change-over valve module and a vacuum generator. The sealing shell is used for containing the ventilation piece and provided with a first connector and a second connector, the first connector is used for being connected to the first end, and the second connector is used for being connected to the second end. The air supply collection module comprises an air flow channel and a flow device, the air flow channel comprises a first channel and a second channel, the first channel is used for being connected between an air source and the first connector, and the second channel is connected between the second connector and the flow device. The change-over valve module is arranged in the first channel, the first channel comprises a positive pressure channel and a negative pressure channel which are connected in parallel, and the change-over valve module is used for controlling on-off of airflow in the negative pressure channel and the positive pressure channel. And the vacuum generator is connected in series in the negative pressure channel. According to the testing equipment, positive and negative pressure measuring gas paths are integrated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air tightness detection, and in particular to a test device. BACKGROUND

[0002] The waterproof and breathable valve is a kind of protective assembly which can be assembled and disassembled, formed by combining a breathable film material with a valve body through injection molding, welding, bonding, hot melting and other process means. With the advantages of dustproof and waterproof, simple installation, long service life and the like, the waterproof and breathable valve is widely used in many industrial fields such as automobiles, communications and medical devices, and plays an important role in improving the protection, reliability and safety of equipment. The air permeability is an important index of the waterproof and breathable valve. For the application scene of the waterproof and breathable valve in the joint of an industrial robot, a device for measuring the air permeability of the waterproof and breathable valve is needed.

[0003] At present, most of the test devices specially used for measuring the air permeability of the waterproof and breathable valve can only measure the one-way air permeability of the waterproof and breathable valve under positive pressure, and only a few test devices have positive and negative pressure test functions. The existing positive and negative pressure test devices are designed as two independent air paths, the air path connection is complex, and the manual switching steps are cumbersome, which is not conducive to improving the test efficiency. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a test device.

[0005] The present application provides a test device for detecting the air permeability of a breathable member. The breathable member has a first end and a second end opposite to each other. The test device includes a sealed shell, a gas supply and collection module, a switching valve module and a vacuum generator. The sealed shell is used to accommodate the breathable member, and the sealed shell has a first interface and a second interface. The first interface is used to be connected to the first end, and the second interface is used to be connected to the second end. The gas supply and collection module includes an airflow channel and a flow device. The airflow channel includes a first channel and a second channel. The first channel is used to be connected between a gas source and the first interface, and the second channel is connected between the second interface and the flow device. The switching valve module is arranged in the first channel. The first channel includes a positive pressure channel and a negative pressure channel connected in parallel. The switching valve module is used to control the on-off of the airflow in the negative pressure channel and the positive pressure channel. The vacuum generator is connected in series in the negative pressure channel. The flow device is used to detect the gas flow in the second channel under the action of the airflow in the second channel, so as to obtain the positive pressure air permeability or the negative pressure air permeability of the breathable member.

[0006] In some optional examples, the switching valve module includes a first valve and a second valve. The first valve is connected in series in the positive pressure channel, and the second valve is connected in series in the negative pressure channel.

[0007] In some optional examples, the switching valve module further includes a third valve arranged in the negative pressure channel. The third valve and the second valve are respectively arranged at two ends of the vacuum generator.

[0008] In some optional examples, the first channel further comprises a gas source channel for connecting a gas source and a gas delivery channel connected to the first interface, one end of the negative pressure channel is connected to the gas source channel and the positive pressure channel through a first three-way joint, and the other end of the negative pressure channel is connected to the positive pressure channel and the gas delivery channel through a second three-way joint.

[0009] In some optional examples, the gas supply collection module further comprises an air treatment device, a pressure regulating valve and a pressure gauge, the air treatment device and the pressure regulating valve are connected in series in the gas source channel, and the pressure gauge is connected in series in the gas delivery channel.

[0010] In some optional examples, the air treatment device comprises at least one of the following structures: an air filter, a pressure reducing valve, an oil atomizer.

[0011] In some optional examples, the test device further comprises a control module electrically connected to the switching valve module, the control module being used to control the on-off of the switching valve module; the control module has an input port and an output port, the input port being electrically connected to the pressure gauge, and the output port being electrically connected to the pressure regulating valve, the control module being used to control the pressure regulating valve to adjust the real-time pressure according to the collection information of the pressure gauge.

[0012] In some optional examples, the output port is electrically connected to the first valve and the second valve, the control module comprises a total key, a first sub-key and a second sub-key, the total key being electrically connected to the pressure regulating valve for controlling the on-off of the first channel, the first sub-key being electrically connected to the first valve for controlling the on-off of the positive pressure channel, and the second sub-key being electrically connected to the second valve for controlling the on-off of the negative pressure channel.

[0013] In some optional examples, the flow device comprises a switching valve and a flow meter, the switching valve is arranged between the second interface and the flow meter, at least two switching channels are arranged in the switching valve, and the flow meter is connected to the second channel through any one of the at least two switching channels.

[0014] In some optional examples, the test device further comprises a silencer connected to the vacuum generator.

[0015] In some optional examples, the sealing shell comprises a first sealing cover and a second sealing cover, the first sealing cover is connected to the second sealing cover to jointly define a sealing cavity, the first interface is arranged on the first sealing cover, and the second interface is arranged on the second sealing cover.

[0016] In some optional examples, the sealing shell further comprises a fixing member and two sealing rings, the fixing member is connected between the first sealing cover and the second sealing cover, the fixing member is provided with a mounting hole for mounting the air permeable member, and the two sealing rings are arranged between the fixing member and the first sealing cover and between the fixing member and the second sealing cover, respectively.

[0017] The test device provided in the application comprises a first channel and a second channel arranged at two ends of the gas permeable piece to be tested, wherein the first channel comprises a positive pressure channel and a negative pressure channel, and the switching valve module is used for controlling the on-off of the gas flow in the positive pressure channel and the negative pressure channel. During the positive pressure test, the switching valve module controls the positive pressure channel to be connected and the negative pressure channel to be disconnected, the gas source supplies gas into the sealed shell, the gas flow passes through the gas permeable piece, enters the second channel from the second interface, and the flow device on the second channel can obtain the positive pressure gas permeation amount of the gas permeable piece under the action of the gas flow. During the negative pressure test, the switching valve module controls the negative pressure channel to be connected and the positive pressure channel to be disconnected, the vacuum generator exhausts the gas from the negative pressure channel, the external air enters the second channel from the flow device and enters the sealed shell, and the gas flow passes through the gas permeable piece and enters the negative pressure channel from the first interface. The flow device on the second channel obtains the negative pressure gas permeation amount of the gas permeable piece under the action of the gas flow.

[0018] The test device of the embodiment of the application has the positive pressure test function and the negative pressure test function, the switching valve module is used to realize the rapid switching of the positive pressure measurement gas path and the negative pressure measurement gas path, the positive pressure measurement gas path and the negative pressure measurement gas path can be integrated, the gas path structure is simple, the switching of the positive pressure and the negative pressure is convenient, and the test efficiency is relatively high. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 FIG. 1 is a simplified structure schematic diagram of the test device provided in an embodiment of the application.

[0021] Figure 2 FIG. 2 is a sectional structure schematic diagram of the sealed shell of the test device shown in FIG. 1. Figure 1

[0022] Figure 3 FIG. 3 is an exploded structure schematic diagram of the sealed shell shown in FIG. 2. Figure 2

[0023] Figure 4 FIG. 4 is a simplified structure schematic diagram of the control module of the test device shown in FIG. 1. Figure 1

[0024] ​​​100, test device; 10, sealed shell; 101, sealed cavity; 12, first sealing cover; 121, first interface; 123, first cavity; 14, second sealing cover; 141, second interface; 143, second cavity; 16, fixing member; 161, mounting hole; 163, mounting portion; 165, connecting portion; 18, sealing ring; 30, gas supply and collection module; 32, gas flow channel; 321, first channel; 3212, positive pressure channel; 3214, negative pressure channel; 3216, gas source channel; 3218, gas delivery channel; 323, second channel; 325, first tee joint; 327, second tee joint; 34, flow device; 341, switching valve; 343, flow meter; 36, air treatment device; 38, pressure regulating valve; 39, pressure gauge; 50, switching valve module; 52, first valve; 54, second valve; 56, third valve; 70, vacuum generator; 80, muffler; 90, control module; 901, input port; 903, output port; 92, general key; 94, first sub-key; 96, second sub-key; 200, gas permeable member; 201, first end; 203, second end; 300, gas source. DETAILED DESCRIPTION

[0025] In order to enable persons skilled in the art to better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work shall fall within the scope of protection of the present application.

[0026] As some terms are used in the description and claims to refer to certain components, those skilled in the art should understand that hardware manufacturers may use different names to refer to the same components. The description and claims do not distinguish components by name difference, but by functional difference. As mentioned throughout the description and claims, "including" is an open term, which should be interpreted as "including but not limited to"; "approximately" means that persons skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0027] Please also refer to Figure 1 and Figure 2 The embodiments of the present application provide a test device 100, which is used for detecting the gas permeation amount of a gas permeable member 200.

[0028] The present specification does not limit the specific type of the air permeable member 200, for example, the air permeable member 200 can be an air permeable valve, an air permeable filter, an air permeable fabric, etc. In the present embodiment, the air permeable member 200 is a waterproof air permeable valve. The air permeable member 200 has a first end 201 and a second end 203 opposite to each other, and an airflow outside the first end 201 of the air permeable member 200 can flow to outside the second end 203 through the air permeable member 200. The test equipment 100 of the present embodiment is used to perform an air permeability test on the air permeable member 200, and the air permeability test includes a positive pressure test and a negative pressure test. In the positive pressure test, the airflow flowing from the first end 201 to the second end 203 is detected, and in the negative pressure test, the airflow flowing from the second end 203 to the first end 201 is detected.

[0029] In the present embodiment, the test equipment 100 is used to connect the air source 300 and the air permeable member 200, and detect the air permeability of the air permeable member 200. The air source 300 can be an external air source. The test equipment 100 can include a sealed shell 10, a gas supply and collection module 30, a switching valve module 50, and a vacuum generator 70. The sealed shell 10 is used to accommodate the air permeable member 200, and the sealed shell 10 has a first interface 121 and a second interface 141. The first interface 121 is used to be connected to the first end 201 of the air permeable member 200, and the second interface 141 is used to be connected to the second end 203 of the air permeable member 200. The gas supply and collection module 30 includes an airflow channel 32 and a flow device 34. The airflow channel 32 includes a first channel 321 and a second channel 323. The first channel 321 is used to be connected between the air source 300 and the first interface 121, and the second channel 323 is connected between the second interface 141 and the flow device 34. The switching valve module 50 is arranged in the first channel 321. The first channel 321 includes a positive pressure channel 3212 and a negative pressure channel 3214, and the switching valve module 50 is used to control the on-off of the airflow in the positive pressure channel 3212 and the negative pressure channel 3214. The vacuum generator 70 is connected in series in the negative pressure channel 3214. The flow device 34 is used to detect the airflow in the second channel 323 under the action of the forward airflow or the reverse airflow in the second channel 323, so as to obtain the positive pressure air permeability or the negative pressure air permeability of the air permeable member 200.

[0030] During the test, the first channel 321 is connected to the air source 300, and after each component in the gas path is installed in place, the switching valve module 50 controls the positive pressure channel 3212 to be connected and the negative pressure channel 3214 to be disconnected. The air source 300 delivers air flow, which flows in the positive pressure channel 3212, enters the first end 201 of the air permeable member 200 through the first interface 121, and part of the air flow flows to the second end 203 and enters the second channel 323 through the second interface 141. The flow device 34 detects the gas flow in the second channel 323 under the action of the positive air flow, and obtains the air permeation amount of the air permeable member 200 under positive pressure. The switching valve module 50 controls the negative pressure channel 3214 to be connected and the positive pressure channel 3212 to be disconnected, and the air source 300 performs air extraction through the vacuum generator 70. The external air enters the air inlet of the flow device 34 and enters the second interface 141 through the second channel 323, and part of the air flow remains from the second end 203 to the first end 201 of the air permeable member 200 and enters the negative pressure channel 3214 through the first interface 121. The flow device 34 detects the gas flow in the second channel 323 under the action of the negative air flow, and obtains the air permeation amount of the air permeable member 200 under negative pressure.

[0031] The test equipment 100 of the embodiment of the present application has positive and negative pressure test functions, and adopts the switching valve module 50 to realize the rapid switching of the positive and negative pressure measurement gas path, so that the positive and negative pressure measurement gas path can be integrated, the gas path structure is simple, the switching of the positive and negative pressure is convenient, and the test efficiency is relatively high.

[0032] In the present application, unless otherwise explicitly specified or limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements, or it can be only surface contact. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0033] Please also refer to Figure 2 and Figure 3 In the present embodiment, the sealing shell 10 is connected to the air flow channel 32 (such as Figure 1The sealing shell 10 can include a first sealing cover 12 and a second sealing cover 14 having inner cavities. A first interface 121 is disposed at one end of the first sealing cover 12 and communicates with the first sealing cover 12. The first sealing cover 12 is open at the end opposite to the first interface 121. The second sealing cover 14 also has an open end, and the open end of the second sealing cover 14 is fixedly connected to the open end of the first sealing cover 12, and the two together define a sealing cavity 101. A second interface 141 is connected to the end of the second sealing cover 14 away from the first sealing cover 12 and communicates with the second sealing cover 14. The first interface 121 and the second interface 141 can each be a plug connector provided on the sealing shell 10, which can be connected to the sealing shell 10 by screwing.

[0034] The gas permeable member 200 is disposed in the sealing cavity 101, and the first sealing cover 12 and the second sealing cover 14 are connected by the gas permeable member 200. The first end 201 of the gas permeable member 200 communicates with the first interface 121 through the first sealing cover 12, and the second end 203 communicates with the second interface 141 through the second sealing cover 14. The first sealing cover 12 and the second sealing cover 14 provide a sealed environment for the gas permeable test of the gas permeable member 200, so that the accuracy and stability of the test are relatively high.

[0035] The specific shape of the sealing shell 10 is not limited in the present specification. For example, the sealing shell 10 can be hollow cuboid, or the sealing shell 10 can also be hollow cylindrical. In the present embodiment, the first sealing cover 12 and the second sealing cover 14 are both substantially hollow cylindrical with one open end.

[0036] In order to facilitate the installation of the gas permeable member 200, in the present embodiment, the sealing shell 10 can further include a fixing member 16 fixedly connected between the first sealing cover 12 and the second sealing cover 14. The fixing member 16 divides the sealing cavity 101 into a first cavity 123 in the first sealing cover 12 and a second cavity 143 in the second sealing cover 14. The fixing member 16 has a mounting hole 161 for mounting the gas permeable member 200, and the mounting hole 161 penetrates the fixing member 16 along the thickness direction of the fixing member 16. The first end 201 of the gas permeable member 200 is embedded in the mounting hole 161, and the second end 203 is located in the second cavity 143. As an example, the first end 201 of the gas permeable member 200 can be provided with external threads, and the inner wall of the mounting hole 161 is provided with internal threads, and the gas permeable member 200 and the fixing member 16 are screwed together. The first cavity 123 and the second cavity 143 are connected to each other through the gas permeable member 200 on the fixing member 16.

[0037] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "inner", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] The fixing member 16 can include a mounting portion 163 and a connecting portion 165, a mounting hole 161 being formed in the mounting portion 163, the mounting portion 163 being substantially circular plate-shaped, and the mounting hole 161 being disposed at the center of the mounting portion 163. The connecting portion 165 is connected to the outer peripheral wall of the mounting portion 163. The thickness of the connecting portion 165 is smaller than the thickness of the mounting portion 163 to form a step at the connection between the two. The thicker mounting portion 163 improves the mounting stability of the air permeable member 200, and the thinner connecting portion 165 facilitates connection with the first sealing cover 12 and the second sealing cover 14. The present specification does not limit the specific connection method between the first sealing cover 12, the second sealing cover 14, and the fixing member 16, for example, the three can be connected by fasteners such as pins, screws, etc., or a structure such as a hoop, a clamp, etc. can be additionally provided to fix the three. As an example, a connecting flange is provided at the outer peripheral wall of the open end of the first sealing cover 12, a connecting flange is also provided at the outer peripheral wall of the open end of the second sealing cover 14, and the connecting portion 165 of the fixing member 16 is clamped between the connecting flange of the first sealing cover 12 and the connecting flange of the second sealing cover 14, and the three are fixedly connected by a plurality of bolts.

[0039] In the present embodiment, the sealing shell 10 can also include two sealing rings 18, one of which is disposed between the fixing member 16 and the first sealing cover 12, and the other of which is disposed between the fixing member 16 and the second sealing cover 14. As an example, recesses can be provided on the opposite end faces of the first sealing cover 12 and the second sealing cover 14 for accommodating the sealing rings 18. When the fixing member 16 and the first sealing cover 12 and the second sealing cover 14 are fixedly connected together, the first sealing cover 12 and the second sealing cover 14 extrude the sealing rings 18 to cause them to deform, so that the respective sealing properties of the first cavity 123 and the second cavity 143 are relatively improved, thereby relatively improving the test accuracy. In other embodiments, the sealing rings 18 can also be provided at recesses on the fixing member 16.

[0040] The first passage 321 of the airflow passage 32 includes a positive pressure passage 3212 and a negative pressure passage 3214 connected in parallel, and both of the positive pressure passage 3212 and the negative pressure passage 3214 are arranged between the air source 300 and the first interface 121. The first passage 321 can also include an air source passage 3216 connected to the air source 300 and an air delivery passage 3218 connected to the first interface 121, and the positive pressure passage 3212 and the negative pressure passage 3214 are arranged between the air source passage 3216 and the air delivery passage 3218. In this embodiment, the airflow passage 32 can further include a first three-way joint 325 and a second three-way joint 327, one end of the negative pressure passage 3214 is connected to the air source passage 3216 and the positive pressure passage 3212 through the first three-way joint 325, and the other end is connected to the air delivery passage 3218 and the positive pressure passage 3212 through the second three-way joint 327. The negative pressure passage 3214 is connected in parallel with the positive pressure passage 3212 through the first three-way joint 325 and the second three-way joint 327, which realizes the integration of the positive and negative pressure measurement air paths, improves the test efficiency, and simplifies the structure of the test equipment 100.

[0041] The switching valve module 50 is arranged in the first passage 321, which can include a plurality of valves to control the on-off of the positive pressure passage 3212 and the negative pressure passage 3214, respectively. In this embodiment, the switching valve module 50 can include a first valve 52 and a second valve 54, the first valve 52 is connected in series in the positive pressure passage 3212, and the first valve 52 is used to control the on-off of the airflow in the positive pressure passage 3212. The second valve 54 is connected in series in the negative pressure passage 3214, and the second valve 54 is used to control the on-off of the airflow in the negative pressure passage 3214. When testing the positive pressure permeation amount of the gas permeation member 200, the first valve 52 is turned on, and the second valve 54 is turned off; when testing the negative pressure permeation amount, the first valve 52 is turned off, and the second valve 54 is turned on.

[0042] The specific installation position of the second valve 54 is not limited in this specification, for example, the second valve 54 can be installed between the first three-way joint 325 and the vacuum generator 70, or the second valve 54 can also be installed between the second three-way joint 327 and the vacuum generator 70.

[0043] In this embodiment, the switching valve module 50 can also include a third valve 56, the third valve 56 is arranged in the negative pressure passage 3214, and the third valve 56 and the second valve 54 are arranged at both ends of the vacuum generator 70. When testing the positive pressure permeation amount of the gas permeation member 200, the first valve 52 is turned on, and the second valve 54 and the third valve 56 are both turned off; when testing the negative pressure permeation amount, the first valve 52 is turned off, and the second valve 54 and the third valve 56 are both turned on. The second valve 54 and the third valve 56 jointly control the on-off of the airflow in the negative pressure passage 3214, which improves the stability of the negative pressure test and further ensures the stability of the action of the vacuum generator 70.

[0044] The present specification does not limit the specific type of the first valve 52, the second valve 54, and the third valve 56. For example, the first valve 52, the second valve 54, and the third valve 56 can include at least one of the following structures: solenoid valves, proportional valves, regulating valves, etc. The first valve 52, the second valve 54, and the third valve 56 can all be solenoid valves or regulating valves, or the first valve 52 is a solenoid valve, the second valve 54 is a regulating valve, and the third valve 56 is a proportional valve, etc. In the present embodiment, the first valve 52, the second valve 54, and the third valve 56 are all solenoid valves. Specifically, the first valve 52, the second valve 54, and the third valve 56 are all two-position two-way solenoid valves. The two-position two-way solenoid valve refers to a solenoid valve with two working positions and two channels. Specifically, “two-position” means that the solenoid valve has two working positions, usually represented as “on” and “off” states; “two-way” means that the solenoid valve has two channels, one for air intake and the other for air outlet.

[0045] In the present embodiment, the flow device 34 is provided with a second channel 323 for detecting gas flow and also for air intake in negative pressure testing. The present specification does not limit the specific structure of the flow device 34. For example, the flow device 34 can be a positive and negative pressure flowmeter compatible with positive and negative pressure, or an electronic flowmeter. In the present embodiment, the flow device 34 can include a switching valve 341 and a flowmeter 343, and the switching valve 341 is arranged between the second interface 141 and the flowmeter 343. The switching valve 341 is provided with at least two reversing channels, and the flowmeter 343 accesses the second channel 323 through any one of the at least two reversing channels. The switching valve 341 is used to switch the air path of the inlet and outlet of the flowmeter 343, which expands the selection range of the type of the flowmeter 343, and the present flowmeter 343 can use a common flowmeter, which reduces the cost of components and improves the adaptability of the testing equipment 100.

[0046] The present specification does not limit the specific type of the switching valve 341. For example, the switching valve 341 can be a two-position five-way solenoid valve, a three-position five-way solenoid valve, an electro-hydraulic reversing valve, etc. In the present embodiment, the switching valve 341 is a two-position five-way solenoid valve, which has a sealed cavity inside, and different positions of the cavity are provided with exhaust holes, each of which leads to a different air path. The middle of the cavity is a valve, and the two sides are two electromagnets. When the coil of a certain electromagnet is energized, the valve body will be attracted to that side, thereby blocking or exposing different exhaust holes. Multiple exhaust holes and valve bodies at different positions can form multiple channels, and the above-mentioned reversing channels are formed by the exhaust holes, the valve body, and the cavity.

[0047] In the embodiment, the inlet of the flow meter 343 is connected with one position of the two-position five-way electromagnetic valve, and the outlet of the flow meter 343 is connected with the two position of the two-position five-way electromagnetic valve. During the positive pressure test, the gas source 300 supplies gas, the gas flows into the second channel 323 through the air permeable member 200, one position of the switching valve 341 is connected with the inlet of the flow meter 343, and the two position of the switching valve 341 is closed, the gas flows into the flow meter 343 through the switching valve 341, and the flow meter 343 detects the gas flow under the action of the positive gas flow. During the negative pressure test, the gas source 300 draws gas through the vacuum generator 70, the switching valve 341 switches the gas path of the inlet and outlet of the flow meter 343, the external gas enters the inlet of the flow meter, is discharged from the outlet of the flow meter, and enters the second channel 323 and the air permeable member 200 through the switching valve 341, and the flow meter 343 detects the gas flow under the action of the negative gas flow.

[0048] The vacuum generator 70 is arranged in the negative pressure channel 3214 and is used to generate negative pressure to test the air permeability of the air permeable member 200 under negative pressure. In some embodiments, the test device 100 can also not include the vacuum generator 70, but can use a vacuum pump as an alternative. Alternatively, the test device 100 can use an electromagnetic valve to control the switching of the gas path, so that the gas is input from the second cavity 143 and output from the first cavity 123 during the negative pressure test.

[0049] In order to reduce the noise generated by the vacuum generator 70 during the test, in the embodiment, the test device 100 can also include a silencer 80 connected to the vacuum generator 70. For example, the silencer 80 can be installed on the outlet pipe of the vacuum generator 70 near the nozzle, so as to effectively reduce the noise of the gas flow.

[0050] In the embodiment, the gas supply and collection module 30 can also include an air treatment device 36 connected in series on the gas source channel 3216. The air treatment device 36 is used to filter and depressurize the gas output by the gas source 300. The air treatment device 36 can include at least one of the following structures: an air filter, a pressure reducing valve, and an oil atomizer. In the embodiment, the air treatment device 36 is a three-in-one device, which is a combination of an air filter, a pressure reducing valve, and an oil atomizer. The three components are used together to ensure that the gas entering the test gas path is purified, filtered, and depressurized, so that the stability of the test gas path is relatively improved.

[0051] The gas supply and collection module 30 can also include a pressure regulating valve 38 and a pressure gauge 39. The pressure gauge 39 is connected in series on the gas supply channel 3218, and is used to feed back the pressure signal of the gas supply channel 3218. The pressure regulating valve 38 is connected in series on the gas source channel 3216, and the pressure regulating valve 38 and the pressure gauge 39 cooperate to jointly ensure the stability of the pressure in the gas flow channel 32 during the test, effectively improve the accuracy of the test, and enable the test device 100 to be suitable for long-term testing.

[0052] Please refer to Figure 1 and Figure 4 In the embodiment, the testing device 100 can further include a control module 90 electrically connected to the switching valve module 50, the control module 90 being configured to control the on-off of the switching valve module 50. The control module 90 is also electrically connected to the switching valve 341 and configured to control the switching valve 341 to switch the inlet and outlet gas paths of the flowmeter 343. The control module 90 controls the on-off of the positive and negative pressure testing gas paths through the switching valve module 50 to realize the rapid switching of the positive and negative pressure testing gas paths, and also controls the switching of the inlet and outlet gas paths of the flowmeter 343 to ensure that the inlet and outlet gas paths of the flowmeter 343 can be switched synchronously with the positive and negative pressure testing gas paths, thereby saving the time for manual switching, improving the testing efficiency, indirectly prolonging the service life of the testing device 100, and reducing the risk of gas leakage.

[0053] Specifically, the control module 90 has an input port 901 and an output port 903, the input port 901 being electrically connected to the first valve 52 and the second valve 54, and the control module 90 further including a general button 92, a first sub-button 94, and a second sub-button 96. The general button 92 is electrically connected to the pressure regulating valve 38 to control the on-off of the first channel 321, the first sub-button 94 is electrically connected to the first valve 52 to control the on-off of the positive pressure channel 3212, and the second sub-button 96 is electrically connected to the second valve 54 to control the on-off of the negative pressure channel 3214. The control module 90 switches the positive pressure testing and the negative pressure testing through the first sub-button 94 and the second sub-button 96. During the switching of the positive and negative pressure testing, the general button 92 is used to disconnect the gas source channel 3216 to ensure that the current testing gas path is disconnected, and the general button 92 can also be used to interrupt the testing in case of an emergency. The control module 90 improves the testing efficiency and reduces the testing risk. In other embodiments, the multiple button point switching mode can not be used for control, for example, the control module 90 can include a timer, and the timer can be controlled by a delay control program to realize the timed automatic switching between the positive and negative pressure testing gas paths.

[0054] In some embodiments, the input port 901 of the control module 90 is also electrically connected to the third valve 56 and the switching valve 341, the control module 90 further ensuring the stability of the negative pressure channel 3214 by controlling the third valve 56 and quickly switching the inlet and outlet gas paths of the flowmeter 343 by controlling the switching valve 341, thereby further improving the testing efficiency.

[0055] In order to realize automatic adjustment of the pressure of the airflow channel 32, the input port 901 of the control module 90 is further electrically connected to the output end of the pressure gauge 39, and the output port 903 is electrically connected to the input end of the pressure regulating valve 38. The control module 90 is used to control the pressure regulating valve 38 to adjust the real-time pressure according to the collected information of the pressure gauge 39. The test equipment 100 of the embodiment of the application realizes automatic pressure adjustment in the whole test process by feeding back the pressure signal through the pressure gauge 39 and controlling the pressure through the control module 90, ensures the stability of the air path pressure by a method with higher adjustment accuracy and saving labor, effectively improves the accuracy of the test result, and enables the control module 90 to be applicable to long-time test.

[0056] In the embodiment, the control logic of the control module 90 for real-time regulation and control of the pressure is PID (proportion-integral-derivative) logic. In other embodiments, the control module 90 can also adopt other control logics to realize real-time regulation and control of the pressure, such as cascade control, optimal control, predictive control, and adaptive control.

[0057] In the test equipment 100 provided by the embodiment of the application, the airflow channel 32 includes a first channel 321 and a second channel 323 arranged at two ends of the to-be-tested air permeable member 200. The first channel 321 further includes a positive pressure channel 3212 and a negative pressure channel 3214, and the switching valve module 50 is used to control the on-off of the airflow in the positive pressure channel 3212 and the negative pressure channel 3214. During positive pressure test, the switching valve module 50 controls the positive pressure channel 3212 to be connected and the negative pressure channel 3214 to be disconnected, the gas source 300 supplies gas into the sealed shell 10, the airflow flows through the air permeable member 200, enters the second channel 323 from the second interface 141, and the flow device 34 on the second channel 323 can obtain the positive pressure air permeation amount of the air permeable member 200 under the action of the positive airflow. During negative pressure test, the switching valve module 50 controls the negative pressure channel 3214 to be connected and the positive pressure channel 3212 to be disconnected, the vacuum generator 70 pumps air from the negative pressure channel 3214, the external air enters the second channel 323 from the flow device 34 and enters the sealed shell 10, the airflow flows through the air permeable member 200 and enters the negative pressure channel 3214 from the first interface 121. The flow device 34 on the second channel 323 obtains the negative pressure air permeation amount of the air permeable member 200 under the action of the negative airflow.

[0058] The test equipment 100 of the embodiment of the application has the functions of positive pressure test and negative pressure test, realizes rapid switching of the positive pressure test and negative pressure test air paths by using the switching valve module 50, integrates the positive pressure test and negative pressure test air paths, has a simple air path structure, is convenient for switching the positive pressure and the negative pressure, and has relatively high test efficiency.

[0059] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0060] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features. And these modifications or replacements do not drive the essence of the corresponding technical solutions out of the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A test apparatus, characterized by, A testing device for detecting air permeability of an air permeable member having a first end and a second end opposite to each other, the testing device comprising: a sealed housing for accommodating the air permeable member, the sealed housing having a first interface and a second interface, the first interface being configured to connect to the first end, the second interface being configured to connect to the second end; a gas supply collecting module comprising a gas flow channel and a flow device, the gas flow channel comprising a first channel and a second channel, the first channel being configured to connect between a gas source and the first interface, the second channel being configured to connect between the second interface and the flow device; a switching valve module arranged in the first channel, the first channel comprising a positive pressure channel and a negative pressure channel in parallel, the switching valve module being configured to control the on-off of the gas flow in the negative pressure channel and the positive pressure channel; and a vacuum generator connected in series in the negative pressure channel; the flow device being configured to detect the gas flow in the second channel under the action of the gas flow in the second channel to obtain the positive pressure air permeability or the negative pressure air permeability of the air permeable member.

2. The test apparatus of claim 1, wherein, The switching valve module comprises a first valve connected in series in the positive pressure channel and a second valve connected in series in the negative pressure channel.

3. The test apparatus of claim 2, wherein, The switching valve module further comprises a third valve arranged in the negative pressure channel, the third valve and the second valve being arranged at two ends of the vacuum generator, respectively.

4. The test apparatus of claim 2, wherein, The first channel further comprises a gas source channel for connecting a gas source and a gas delivery channel connected to the first interface, one end of the negative pressure channel being connected to the gas source channel and the positive pressure channel through a first three-way joint, and the other end being connected to the positive pressure channel and the gas delivery channel through a second three-way joint.

5. The test apparatus of claim 4, wherein, The gas supply collecting module further comprises an air treatment device, a pressure regulating valve and a pressure gauge, the air treatment device and the pressure regulating valve being connected in series in the gas source channel, and the pressure gauge being connected in series in the gas delivery channel.

6. The test apparatus of claim 5, wherein, The air treatment device comprises at least one of the following structures: an air filter, a pressure reducing valve, an oil atomizer.

7. The test apparatus of claim 5, wherein, The testing device further comprises a control module electrically connected to the switching valve module, the control module being configured to control the on-off of the switching valve module; the control module has an input port electrically connected to the pressure gauge and an output port electrically connected to the pressure regulating valve, the control module being configured to control the pressure regulating valve to adjust the real-time pressure according to the collected information of the pressure gauge.

8. The test apparatus of claim 7, wherein, The output port is electrically connected to the first valve and the second valve, and the control module comprises a total key, a first sub-key and a second sub-key, the total key being electrically connected to the pressure regulating valve for controlling the on-off of the first channel, the first sub-key being electrically connected to the first valve for controlling the on-off of the positive pressure channel, and the second sub-key being electrically connected to the second valve for controlling the on-off of the negative pressure channel.

9. The test apparatus of any one of claims 1 to 8, wherein, The flow device comprises a switching valve and a flow meter, the switching valve is arranged between the second interface and the flow meter, at least two switching channels are arranged in the switching valve, and the flow meter is connected to the second channel through any one of the at least two switching channels.

10. The test apparatus of any one of claims 1 to 8, wherein, The test device further comprises a muffler connected to the vacuum generator.

11. The test apparatus of any one of claims 1 to 8, wherein, The sealing shell comprises a first sealing cover and a second sealing cover, the first sealing cover is connected to the second sealing cover to jointly define a sealing cavity, the first interface is arranged on the first sealing cover, and the second interface is arranged on the second sealing cover.

12. The test apparatus of claim 11, wherein, The sealing shell further comprises a fixing member and two sealing rings, the fixing member is connected between the first sealing cover and the second sealing cover, the fixing member is provided with a mounting hole for mounting the air permeable member, and the two sealing rings are arranged between the fixing member and the first sealing cover and between the fixing member and the second sealing cover respectively.

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