Filter membrane clamp

Abstract

The utility model discloses a filter membrane clamp. The filter membrane clamp comprises an upper end cover, a lower end cover, a bearing filter screen and a locking ring, the upper end cover comprises a first connector and a first containing cavity communicated with the first connector, and the lower end cover comprises a second connector, a second containing cavity communicated with the second connector and a bearing platform. The bearing filter screen is arranged on the bearing platform and is used for bearing the filter membrane; the locking ring is used for mutually locking the upper end cover and the lower end cover; the first connector, the first containing cavity, the second containing cavity and the second connector are sequentially communicated to form a fluid circulation channel, and the bearing filter screen is located in the fluid circulation channel. The filter membrane clamp can be used for fixing the filter membrane and sampling fogging airflow by the filter membrane, is simple in structure, small in size and convenient to operate and arrange, and can obtain the accuracy of a photometer by weighing the weight of the filter membrane before and after sampling and comparing the weight with a concentration value directly sampled by a fogging port by using the photometer.

Description

Technical Field

[0001] The utility model relates to the technical field of photometer calibration, in particular to a filter membrane fixture. Background Art

[0002] Photometers and aerosol generators are currently the most commonly used means of leak detection for high-efficiency filters. The principle is that the aerosol generator emits oil mist to the upstream of the high-efficiency filter. After the photometer measures the upstream concentration, it measures the downstream leakage of the high-efficiency filter. The upstream and downstream measured data are used to calculate whether the leakage rate of the high-efficiency filter meets the standard. The accuracy of the photometer in this process has a decisive influence on the result, so the accuracy of the photometer must be verified. At present, the common method is to use a standard machine and an aerosol generator to verify the photometer being tested, but this is still not accurate enough, because the error of the standard machine will also affect the final verification result of the tested machine through cumulative amplification. Utility Model Content

[0003] The purpose of the utility model is to overcome one or more deficiencies in the prior art and to provide a novel filter membrane clamp that can firmly fix the filter membrane. The filter membrane clamp can realize sampling of the mist-generating airflow by the filter membrane while fixing the filter membrane, and has a simple structure, a small size, and a convenient operation arrangement. The accuracy of the photometer can be obtained by weighing the weight of the filter membrane before and after sampling and then comparing it with the concentration value directly sampled from the mist-generating port using a photometer.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A filter membrane fixture, comprising an upper end cover, a lower end cover, a bearing filter screen and a locking ring; the upper end cover comprises a first interface and a first cavity connected to the first interface, the lower end cover comprises a second interface, a second cavity connected to the second interface, and a bearing platform;

[0006] The supporting filter screen is arranged on the supporting platform and is used to support the filter membrane, and the locking ring is used to lock the upper end cover and the lower end cover together;

[0007] The first interface, the first cavity, the second cavity and the second interface are connected in sequence to form a fluid flow channel, and the load-bearing filter is located in the fluid flow channel.

[0008] According to some specific and preferred aspects of the utility model, a first step is formed on the upper end cover, an external thread is formed on the lower end cover, an internal thread and a second step are respectively formed on the locking ring, the locking ring is connected to the lower end cover by screwing the internal thread and the external thread, and the second step is pressed on the first step.

[0009] Furthermore, a third step is provided on the locking ring, and a fourth step is provided on the upper end of the lower end cover. The third step is used to be pressed on the fourth step, and the third step is located below the second step.

[0010] According to some preferred aspects of the utility model, the lower end portion of the upper end cover is located inside the locking ring.

[0011] According to some preferred aspects of the utility model, the fluid flow channel is wide in the middle and narrow at both ends.

[0012] According to some preferred aspects of the utility model, the filter membrane fixture also includes a sealing ring, and the sealing ring is arranged between the upper end cover and the lower end cover.

[0013] Furthermore, a fifth step is provided on the lower end cover, and the fifth step is located outside the bearing platform and has a height in the vertical direction higher than the bearing platform and lower than the fourth step;

[0014] The sealing ring is arranged on the fifth step, and a blocking member is also arranged on the outer side of the fifth step, and the blocking member is used to limit the sealing ring from deviating outward.

[0015] According to some specific aspects of the utility model, the sealing ring is a fluororubber sealing ring.

[0016] According to some preferred aspects of the utility model, the filter membrane fixture further comprises a polytetrafluoroethylene gasket, which is pressed onto the supporting filter screen and is located between the supporting filter screen and the upper end cover.

[0017] According to some preferred aspects of the present invention, the load-bearing filter screen is a stainless steel filter screen.

[0018] The application method of the filter membrane clamp of the utility model is as follows: a filter membrane with a certain filtering efficiency is fixed in the middle of a sealed clamp, and air pipe joints are installed at both ends; then an air pump with a certain flow rate (generally the flow rate is consistent with the sampling flow rate of a photometer, which is 28.3L / min) is used to sample the clamp from one end for a fixed time, and a generator with a stable fogging amount is used to generate fog at the other end, and a high-precision balance of one hundred thousandth is used to weigh the filter membrane before and after the fogging to obtain the sampling concentration value, and then a photometer is used to compare the concentration value directly sampled at the fogging port, so as to obtain the accuracy of the photometer.

[0019] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0020] The utility model innovatively provides a novel filter membrane clamp structure which can fix the filter membrane, and can also realize sampling of the misting airflow by the filter membrane while fixing the filter membrane. Specifically, through the cooperation of the upper end cover, the lower end cover, the locking ring and the supporting filter screen, not only the overall structure volume occupies a small space, but also the structure is simple and easy to operate. The supporting filter membrane located in the fluid flow channel can ensure that when the misting air flows through the filter membrane, the filter membrane will not be offset or deformed, thereby avoiding reducing its sampling accuracy. The accuracy of the photometer can be obtained by weighing the weight of the filter membrane before and after sampling and then comparing it with the concentration value directly sampled from the misting port using a photometer. The improved accuracy of the photometer can also improve the detection accuracy of the filtration efficiency of the high-efficiency filter, and the consistency is good, and the problem of cumulative amplification will not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 labor.

[0022] Figure 1 This is a schematic diagram of the structure of the filter membrane fixture in the embodiment of the utility model;

[0023] Figure 2 This is an exploded schematic diagram of the filter membrane fixture in the embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the locking ring in the embodiment of the utility model;

[0025] Figure 4 It is a cross-sectional schematic diagram of a locking ring in an embodiment of the utility model;

[0026] Figure 5 It is a cross-sectional schematic diagram of the filter membrane fixture in the embodiment of the utility model;

[0027] In the accompanying drawings: 1. upper end cover; 11. first interface; 12. first cavity; 13. first step; 2. lower end cover; 21. second interface; 22. second cavity; 23. bearing platform; 24. fourth step; 25. fifth step; 3. bearing filter; 4. locking ring; 41. second step; 42. third step; 5. sealing ring; 6. polytetrafluoroethylene gasket. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0029] In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] like Figures 1 to 5 As shown, this example provides a filter membrane clamp, which includes an upper end cover 1, a lower end cover 2, a supporting filter screen 3 and a locking ring 4.

[0032] The upper end cover 1 includes a first interface 11 and a first cavity 12 connected to the first interface 11. The first interface 11 can be connected to the outside, for example, it can be connected to the outlet of the misting airflow to introduce the misting airflow. Therefore, the first interface 11 can be set in various forms. For example, an external thread or an internal thread can be set, and adaptive adjustment can be made according to the specific structure of the outlet of the misting airflow to achieve sealed connection. The first cavity 12 can reduce the pressure and stabilize the introduced misting airflow to avoid unexpected events such as damage to the filter membrane due to excessive airflow.

[0033] The lower end cover 2 includes a second interface 21, a second cavity 22 connected to the second interface 21, and a bearing platform 23. The second interface 21 can be connected to the outside, for example, it can be connected to an air pump to provide power for the misting airflow. The second cavity 22 is symmetrically arranged with the first cavity 12.

[0034] The supporting filter screen 3 is arranged on the supporting platform 23 and is used to support the filter membrane. The supporting filter screen 3 can be a stainless steel filter screen, which provides strong support and is not prone to serious degeneration during the circulation of high-speed airflow. The locking ring 4 is used to lock the upper end cover 1 and the lower end cover 2 together, and the filter membrane is fixed at the same time when locking;

[0035] The first interface 11, the first cavity 12, the second cavity 22 and the second interface 21 are connected in sequence to form a fluid flow channel, and the support filter 3 is located in the fluid flow channel.

[0036] In this example, a first step 13 is formed on the upper end cover 1, an external thread is formed on the lower end cover 2, an internal thread and a second step 41 are respectively formed on the locking ring 4, the locking ring 4 and the lower end cover 2 are connected by screwing the internal thread and the external thread, the lower end of the upper end cover 1 is located inside the locking ring 4, and the second step 41 is pressed on the first step 13, so that the upper end cover 1 can be simultaneously driven to approach the lower end cover 2 during the process of screwing the locking ring 4 and the lower end cover 2, so that the two are tightly fitted and locked, thereby improving the air tightness.

[0037] Furthermore, a third step 42 is provided on the locking ring 4, and a fourth step 24 is provided on the upper end of the lower end cover 2. The third step 42 is used to be pressed onto the fourth step 24. The third step 42 is located below the second step 41. This arrangement, on the one hand, can play a fool-proof role, that is, when the third step 42 is pressed onto the fourth step 24, it means that the locking ring has been locked to the limit and the thread cannot be further rotated and tightened, otherwise the components may be damaged. On the other hand, the airtightness can be further improved.

[0038] In this example, the fluid flow channel is wide in the middle and narrow at both ends, that is, after the mist airflow enters, it can first diffuse to achieve pressure reduction, and then shrink to achieve rapid outflow after sampling through the filter membrane. This can protect the filter membrane and also help ensure the accuracy of filter membrane sampling.

[0039] In this example, the filter membrane fixture also includes a sealing ring 5, which is arranged between the upper end cover 1 and the lower end cover 2, so that the sealing ring 5 can be used to seal when the two are locked, thereby further improving the air tightness. Furthermore, a fifth step 25 is arranged on the lower end cover 1, and the fifth step 25 is located on the outside of the bearing platform 23 and has a height in the vertical direction higher than the bearing platform 23 and lower than the fourth step 24; the sealing ring 5 is arranged on the fifth step 25, and a blocking member is also arranged on the outside of the fifth step 25, and the blocking member is used to limit the deviation of the sealing ring 5 to the outside. As an optional embodiment, the sealing ring 5 is a fluororubber sealing ring.

[0040] In this example, the filter membrane clamp also includes a polytetrafluoroethylene gasket 6, which is pressed onto the supporting filter screen 3 and is located between the supporting filter screen 3 and the upper end cover 1. The function of the polytetrafluoroethylene gasket 6 is, on the one hand, to further improve the air tightness, and on the other hand, it can also press the filter membrane onto the supporting filter screen 3 to ensure its stability.

[0041] The working process of this example is as follows: one end of the upper end cover 1 can be the aerosol inlet end, which is connected to the generator outlet. The locking ring 4 is used to lock the upper end cover 1 with the lower end cover 2 and the internal sealing ring 5, polytetrafluoroethylene gasket 6 and stainless steel filter to ensure the sealing and stability of the overall structure. The lower end cover is connected to an air pump with a certain flow rate (28.3L / min). When the generator starts to fog and the air pump starts to pump air, the filter membrane on the fixture begins to accumulate aerosol. After a certain period of time, the sampled concentration value is calculated by comparing the weight of the filter membrane before and after a high-precision balance.

[0042] The application method of the filter membrane clamp of the utility model is as follows: a filter membrane with a certain filtering efficiency is fixed in the middle of a sealed clamp, and air pipe joints are installed at both ends; then an air pump with a certain flow rate (generally the flow rate is consistent with the sampling flow rate of a photometer, which is 28.3L / min) is used to sample the clamp from one end for a fixed time, and a generator with a stable fogging amount is used to generate fog at the other end, and a high-precision balance of one hundred thousandth is used to weigh the filter membrane before and after the fogging to obtain the sampling concentration value, and then a photometer is used to compare the concentration value directly sampled at the fogging port, so as to obtain the accuracy of the photometer.

[0043] In summary, the utility model innovatively provides a new type of filter membrane clamp structure that can fix the filter membrane, and can also realize the sampling of the misting airflow by the filter membrane while fixing the filter membrane. Specifically, through the cooperation of the upper end cover, the lower end cover, the locking ring and the supporting filter screen, not only the overall structure volume occupies a small space, but also the structure is simple and easy to operate. The supporting filter membrane located in the fluid flow channel can ensure that when the misting air flows through the filter membrane, the filter membrane will not be offset or deformed, thereby avoiding reducing its sampling accuracy. The accuracy of the photometer can be obtained by weighing the weight of the filter membrane before and after sampling and then comparing it with the concentration value directly sampled from the misting port using a photometer. The improved accuracy of the photometer can improve the detection accuracy of the filtration efficiency of the high-efficiency filter, and the consistency is good, and the problem of cumulative amplification will not occur.

[0044] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A filter membrane fixture, characterized in that: The filter membrane fixture comprises an upper end cover, a lower end cover, a bearing filter screen and a locking ring; the upper end cover comprises a first interface and a first cavity connected to the first interface, and the lower end cover comprises a second interface, a second cavity connected to the second interface, and a bearing platform; The supporting filter screen is arranged on the supporting platform and is used to support the filter membrane, and the locking ring is used to lock the upper end cover and the lower end cover together; The first interface, the first cavity, the second cavity and the second interface are connected in sequence to form a fluid flow channel, and the load-bearing filter is located in the fluid flow channel.

2. The filter membrane fixture according to claim 1, characterized in that: The upper end cover is formed with a first step, the lower end cover is formed with an external thread, the locking ring is respectively formed with an internal thread and a second step, the locking ring is connected to the lower end cover by screwing the internal thread and the external thread, and the second step is pressed onto the first step.

3. The filter membrane fixture according to claim 2, characterized in that: The locking ring is also provided with a third step, and the upper end of the lower end cover is provided with a fourth step. The third step is used to be pressed on the fourth step, and the third step is located below the second step.

4. The filter membrane fixture according to claim 1, characterized in that: The lower end portion of the upper end cover is located inside the locking ring.

5. The filter membrane fixture according to claim 1, characterized in that: The fluid flow channel is wide in the middle and narrow at both ends.

6. The filter membrane fixture according to claim 3, characterized in that: The filter membrane fixture also includes a sealing ring, which is arranged between the upper end cover and the lower end cover.

7. The filter membrane holder according to claim 6, characterized in that: The lower end cover is provided with a fifth step, the fifth step is located outside the bearing platform and has a height in the vertical direction higher than the bearing platform and lower than the fourth step; The sealing ring is arranged on the fifth step, and a blocking member is also arranged on the outer side of the fifth step, and the blocking member is used to limit the sealing ring from deviating outward.

8. The filter membrane holder according to claim 6, characterized in that: The sealing ring is a fluororubber sealing ring.

9. The filter membrane fixture according to claim 1, characterized in that: The filter membrane fixture also includes a polytetrafluoroethylene gasket, which is pressed onto the supporting filter screen and is located between the supporting filter screen and the upper end cover.

10. The filter membrane holder according to claim 1, characterized in that: The load-bearing filter is a stainless steel filter.

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