Pressure drop detection device for breathable film

Abstract

The utility model relates to the technical field of medical consumable detection, in particular to a pressure drop detection device of a breathable film, which comprises an air supply system, a pressure difference detection meter and a combined positioning joint, the combined positioning joint comprises an upper shell, a lower shell and an axial positioning mechanism, the upper shell and the lower shell are coaxially arranged, the bottom surface of the upper shell is arranged to be an annular pressure applying plane, and the bottom surface of the lower shell is arranged to be an annular pressure applying plane. The top face of the lower shell is arranged to be a pressure bearing plane corresponding to the pressure applying plane, and the upper shell and the lower shell are in butt joint and fixed through an axial positioning mechanism. According to the utility model, the combined positioning joint is arranged to quickly fix the breathable film to be detected, the air supply system is arranged to supply air to the first pressure cavity and the second pressure cavity at the two sides of the breathable film and inject pressure, and the pressure difference between the first pressure cavity and the second pressure cavity is obtained through the pressure difference detection meter, so that the air blocking performance of the breathable film is accurately evaluated; the structure is simple, installation is rapid, use is convenient, and continuous detection operation of the breathable film is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical consumable detection technical field especially, relate to a kind of pressure drop detection device of air-permeable membrane. BACKGROUND

[0002] At present, air-permeable membrane is used in medical instrument product, for example, medical mask, filter tip for equipment etc., these air-permeable membranes can filter certain particulate matter in air, but also simultaneously affect the gas passing ability, so there is certain requirement to the pressure drop (air resistance performance) of air-permeable membrane. The existing pressure drop detection device is mostly complex structure, installation is tedious, leading to user inconvenient to use;And the existing pressure drop detection device is long in time consumption for single taking and placing air-permeable membrane, inconvenient for continuous detection operation of air-permeable membrane. UTILITY MODEL CONTENT

[0003] The utility model solves the technical problem in the prior art, and provides a pressure drop detection device of air-permeable membrane, which is simple in structure, quick to install, convenient for user to use and continuous detection operation.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A kind of pressure drop detection device of air-permeable membrane, characterized in that:

[0006] Including gas supply system, differential pressure detection table and combined positioning connector, gas supply system has gas inlet, differential pressure detection table has high-pressure side access and low-pressure side access;

[0007] Combined positioning connector includes upper shell, lower shell and axial positioning mechanism, upper shell and lower shell are coaxially arranged, and are fixed by axial positioning mechanism, the bottom surface of upper shell is set as annular pressure surface, the top surface of lower shell is set as pressure receiving surface corresponding to pressure surface;

[0008] First pressure cavity is provided in upper shell, second pressure cavity is provided in lower shell, the top of upper shell is provided with first exhaust port leading to first pressure cavity, first exhaust port is connected with the high-pressure side access of differential pressure detection table by first exhaust pipe, the bottom of lower shell is provided with second exhaust port leading to second pressure cavity, second exhaust port is connected with the low-pressure side access of differential pressure detection table by second exhaust pipe;

[0009] The top of upper shell is also provided with first air inlet leading to first pressure cavity, first air inlet is connected with the gas inlet of gas supply system by first air inlet pipe.

[0010] The technical problems to be solved by the utility model further can be further realized through the following steps, the gas supply system includes gas source and gas flowmeter, the gas inlet of gas flowmeter is connected with gas source, the gas outlet of gas flowmeter is set as the gas inlet of gas supply system, the adjusting knob of adjusting gas flow rate is equipped on gas flowmeter.

[0011] The technical problems to be solved by the utility model further can be further realized through the following steps, the axial positioning mechanism includes positioning sleeve and connecting assembly, positioning sleeve is coaxially arranged on the outer circumferential side of upper shell and lower shell, the lower part of positioning sleeve is integrally connected with the outer circumferential surface of lower shell, and the upper part of positioning sleeve is detachably connected with the outer circumferential surface of upper shell through connecting assembly.

[0012] The technical problems to be solved by the utility model further can be further realized through the following steps, the connecting assembly includes correspondingly arranged internal thread and external thread, the internal thread is opened on the inner circumferential surface of positioning sleeve in circumferential direction, and the external thread is fixedly arranged on the outer circumferential surface of upper shell in circumferential direction.

[0013] The technical problems to be solved by the utility model further can be further realized through the following steps, the connecting assembly includes correspondingly arranged annular clamping groove and annular protrusion, the annular clamping groove is coaxially arranged on the inner circumferential surface of positioning sleeve, and the annular protrusion is coaxially fixedly arranged on the outer circumferential surface of upper shell.

[0014] The technical problems to be solved by the utility model further can be further realized through the following steps, the inner surface of annular clamping groove or the outer surface of annular protrusion is coated with sealing adhesive layer.

[0015] The technical problems to be solved by the utility model further can be further realized through the following steps, the flexible gasket is installed on the pressure application plane and the pressure bearing plane.

[0016] Compared with the prior art, the utility model has the advantages that: the combined positioning connector is arranged to quickly fix the measured air permeable film, the gas supply system is arranged to supply gas to the first pressure cavity and the second pressure cavity on both sides of the air permeable film, and the differential pressure detection table is used to obtain the pressure difference between the first pressure cavity and the second pressure cavity, so that the air resistance performance of the air permeable film can be accurately evaluated, the structure is simple, and the installation is quick; the adjusting knob of the gas flowmeter can be used to quickly adjust the gas flow rate, the adjustment is rapid, the use is convenient, and the detection requirement of different air permeable films can be met; the axial positioning mechanism connecting the upper shell and the lower shell adopts thread or buckle positioning, the air permeable film can be quickly installed and removed, the use is flexible, and the continuous detection operation of the air permeable film is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall structure schematic view of the utility model embodiment 1;

[0018] Figure 2This is a schematic diagram of the combined positioning joint of Embodiment 1 of this utility model;

[0019] Figure 3 This is a partially disassembled schematic diagram of the combined positioning joint in Embodiment 2 of this utility model;

[0020] in Figure 2 The connection components consist of external and internal threads. Figure 3 The connecting components are annular grooves and annular protrusions;

[0021] In the diagram: 1-Differential pressure gauge; 2-Combined positioning connector; 3-Gas supply port; 41-High pressure side inlet; 42-Low pressure side inlet; 5-Upper housing; 6-Lower housing; 7-Ventilation membrane installation gap; 8-First pressure chamber; 9-Second pressure chamber; 10-First exhaust port; 11-First exhaust pipe; 12-Second exhaust port; 13-Second exhaust pipe; 14-First air inlet; 15-First air inlet pipe; 16-Flexible washer; 17-Positioning sleeve; 18-Annular groove; 19-Annular protrusion; 20-Sealing adhesive layer; 21-Gas flow meter; 22-Adjusting knob. Detailed Implementation

[0022] The specific technical solutions of this utility model are further described below to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0024] [Example 1] Please refer to Figures 1-2 A pressure drop detection device for a breathable membrane includes an air supply system, a differential pressure gauge 1, and a combined positioning connector 2. The air supply system has an air supply port 3, and the differential pressure gauge 1 has a high-pressure side inlet 41 and a low-pressure side inlet 42.

[0025] The combined positioning joint 2 comprises an upper shell 5, a lower shell 6 and an axial positioning mechanism, the upper shell 5 and the lower shell 6 are made of plastic, the upper shell 5 and the lower shell 6 are coaxially arranged and are fixedly connected by the axial positioning mechanism; the bottom surface of the upper shell 5 is provided with an annular pressing surface, the top surface of the lower shell 6 is provided with a corresponding pressure receiving surface, and a gas permeable membrane installation gap 7 is arranged between the pressing surface and the pressure receiving surface, the height of the gas permeable membrane installation gap 7 is less than the maximum thickness of the gas permeable membrane to be tested, so as to facilitate the pressing and fixing of the gas permeable membrane; a flexible gasket 16 is arranged on the pressing surface and the pressure receiving surface to prevent damage to the gas permeable membrane;

[0026] A first pressure cavity 8 is arranged in the upper shell 5, a second pressure cavity 9 is arranged in the lower shell 6, a first exhaust port 10 is arranged on the top of the upper shell 5 and connected to the first pressure cavity 8, the first exhaust port 10 is connected to the high-pressure side inlet port 41 of the differential pressure detection table 1 through a first exhaust pipe 11, a second exhaust port 12 is arranged on the bottom of the lower shell 6 and connected to the second pressure cavity 9, and the second exhaust port 12 is connected to the low-pressure side inlet port 42 of the differential pressure detection table 1 through a second exhaust pipe 13.

[0027] A first gas inlet port 14 is further arranged on the top of the upper shell 5 and connected to the first pressure cavity 8, and the first gas inlet port 14 is connected to the gas supply port 3 of the gas supply system through a first gas inlet pipe 15.

[0028] The axial positioning mechanism comprises a positioning sleeve 17 and a connecting assembly, the positioning sleeve 17 is coaxially arranged on the outer circumferential side of the upper shell 5 and the lower shell 6, the lower part of the positioning sleeve 17 is integrally connected with the outer circumferential surface of the lower shell 6, and the upper part of the positioning sleeve 17 is detachably connected with the outer circumferential surface of the upper shell 5 through the connecting assembly.

[0029] The connecting assembly comprises corresponding internal threads and external threads, Figure 2 the internal threads are circumferentially arranged on the inner circumferential surface of the positioning sleeve 17, and the external threads are circumferentially fixedly arranged on the outer circumferential surface of the upper shell 5. During use, the upper shell 5 and the positioning sleeve 17 are held and twisted in opposite directions, so that the upper shell 5 can be quickly removed.

[0030] The gas supply system comprises a gas source and a gas flow meter 21, the gas source in this embodiment is an air pump, the gas inlet port of the gas flow meter 21 is connected to the gas source, the gas outlet port of the gas flow meter 21 is provided as the gas supply port 3 of the gas supply system, and the gas flow meter 21 is provided with an adjusting knob 22 for adjusting the gas flow rate.

[0031]

Embodiment 2

[0032]

Usage method

[0033] The usage methods of the embodiment 1 and the embodiment 2 of the air permeable film pressure drop detection device are as follows.

[0034] 1) Installation: hold the upper shell 5 and the positioning sleeve 17, remove the upper shell 5 from the positioning sleeve 17 by rotating or applying axial force; place the air permeable film to be detected into the positioning sleeve 17, so that the edge portion of the air permeable film is attached to the flexible gasket 16 on the pressure bearing plane, and it is ensured that the air permeable film is flat and wrinkle-free; then the upper shell 5 is installed back to the positioning sleeve 17 in the original way, so that the upper shell 5 is connected and fixed with the lower shell 6, at this time, the pressure bearing plane tightly presses the air permeable film on the pressure bearing plane, and the first pressure cavity 8 and the second pressure cavity 9 are in airtight communication through the air permeable film.

[0035] 2) Detection: turn on the gas source switch, and adjust the gas flow rate to the process set value through the adjusting knob 22 on the gas flow meter 21, the gas enters the first pressure cavity 8 through the first gas inlet pipe 15, and enters the second pressure cavity 9 after passing through the air permeable film, in this process, a pressure difference is formed between the first pressure cavity 8 and the second pressure cavity 9 due to the existence of the air permeable film; the high-pressure side inlet 41 and the low-pressure side inlet 42 of the pressure difference detection table 1 are connected to the first pressure cavity 8 and the second pressure cavity 9 respectively, and the reading of the pressure difference detection table 1 is observed and recorded, so that the air resistance performance of the air permeable film can be accurately evaluated.

[0036] Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

Claims

1. A pressure drop detection device for a breathable membrane, characterized in that: It includes a gas supply system, a differential pressure gauge, and a combination positioning connector. The gas supply system has a gas supply port, and the differential pressure gauge has a high-pressure side inlet and a low-pressure side inlet. The combined positioning joint includes an upper housing, a lower housing, and an axial positioning mechanism. The upper housing and the lower housing are coaxially arranged and fixed by the axial positioning mechanism. The bottom surface of the upper housing is set as an annular pressure-applying plane, and the top surface of the lower housing is set as a pressure-bearing plane corresponding to the pressure-applying plane. The upper housing has a first pressure chamber and the lower housing has a second pressure chamber. The top of the upper housing has a first exhaust port leading to the first pressure chamber. The first exhaust port is connected to the high-pressure side inlet of the differential pressure gauge through a first exhaust pipe. The bottom of the lower housing has a second exhaust port leading to the second pressure chamber. The second exhaust port is connected to the low-pressure side inlet of the differential pressure gauge through a second exhaust pipe. The top of the upper housing is also provided with a first air inlet leading to the first pressure chamber. The first air inlet is connected to the air supply port of the air supply system through a first air inlet pipe.

2. The pressure drop detection device for the breathable membrane according to claim 1, characterized in that: The gas supply system includes a gas source and a gas flow meter. The gas flow meter's inlet is connected to the gas source, and the gas flow meter's outlet is set as the gas supply port of the gas supply system. The gas flow meter is equipped with an adjustment knob for adjusting the gas flow rate.

3. The pressure drop detection device for the breathable membrane according to claim 1, characterized in that: The axial positioning mechanism includes a positioning sleeve and a connecting assembly. The positioning sleeve is coaxially disposed on the outer periphery of the upper and lower housings. The lower part of the positioning sleeve is integrally connected to the outer periphery of the lower housing, and the upper part of the positioning sleeve is detachably connected to the outer periphery of the upper housing through the connecting assembly.

4. The pressure drop detection device for the breathable membrane according to claim 3, characterized in that: The connecting component includes corresponding internal and external threads. The internal thread is circumferentially formed on the inner circumferential surface of the positioning sleeve, and the external thread is circumferentially fixed on the outer circumferential surface of the upper housing.

5. The pressure drop detection device for the breathable membrane according to claim 3, characterized in that: The connecting component includes a corresponding annular groove and an annular protrusion. The annular groove is coaxially disposed on the inner circumferential surface of the positioning sleeve, and the annular protrusion is coaxially fixedly disposed on the outer circumferential surface of the upper housing.

6. The pressure drop detection device for the breathable membrane according to claim 5, characterized in that: The inner surface of the annular groove or the outer surface of the annular protrusion is coated with a sealant layer.

7. The pressure drop detection device for the breathable membrane according to claim 1, characterized in that: Flexible washers are installed on both the pressure-applying surface and the pressure-bearing surface.

Images