Filtering device

Abstract

The utility model relates to a filtering device, and the filtering device (1) comprises a shell (10), the shell (10) is provided with a top (12) provided with an input port (122), a barrel (13) and a bottom (16) provided with an output port (162), and the top (12) and the bottom (16) are detachably arranged at the end parts, opposite to each other in the axial direction, of the barrel (13); a filter body (18) arranged in the housing (10); a one-way valve (40), preferably an adjustable one-way valve, which is arranged in a line connecting the inlet opening (122) and the outlet opening (162), the inlet opening (122) being designed to be connectable to a positive pressure source and / or the outlet opening (162) being designed to be connectable to a negative pressure source, the positive pressure source and / or the negative pressure source being able to establish a predetermined pressure difference in the space of the housing separated by the filter body (18).

Description

TECHNICAL FIELD

[0001] The utility model relates to a filter device, especially for filtering the compound containing radionuclide. BACKGROUND

[0002] In the preparation of urea- 14 C, barium carbonate- 14 C source material or other 14 Filtering is involved when producing C-labeled precursor compound products. For the filtering of such compounds containing radionuclide, the transfer and filtering of the material must be carried out in a sealed pipeline or reactor. At this time, it is particularly important to have a filtering device that can effectively ensure normal filtering of the material, completely isolate the material from the outside world, and ensure automatic filtering. The continuous closed filter devices on the market have various problems in terms of quickly filtering a small amount of material containing microparticles and radionuclide, such as easy clogging and low filtering efficiency. SUMMARY

[0003] The utility model discloses a filter device, which can at least partially solve the above problems.

[0004] The filter device according to the utility model comprises: a housing having a top portion provided with an input port, a cylinder body and a bottom portion provided with an output port, the top portion and the bottom portion being detachably arranged at axially opposite ends of the cylinder body; a filter body arranged in the housing; a one-way valve, preferably an adjustable one-way valve, arranged in a pipeline connected with the input port and the output port, wherein the input port is designed to be connectable with a positive pressure source and / or the output port is designed to be connectable with a negative pressure source, and the positive pressure source and / or the negative pressure source can establish a predetermined pressure difference in a space of the housing separated by the filter body. BRIEF DESCRIPTION OF DRAWINGS

[0005] For a better understanding of the purpose, features, advantages and functions of the utility model, reference can be made to the preferred embodiments shown in the drawings. The same reference signs in the drawings refer to functionally identical or similar elements. It should be understood by those skilled in the art that the drawings are intended to illustrate the preferred embodiments of the utility model schematically, and have no limiting effect on the scope of the utility model, and the various components in the drawings are not drawn to scale. The utility model will be described below with the help of the drawings. Among them,

[0006] Figure 1 An embodiment of the filter device according to the utility model is schematically shown;

[0007] Figure 2 An exploded view of the housing of the filter device of Figure 1 is schematically shown; and

[0008] Figure 3An exploded view of another embodiment of the housing of the filter device according to the present application is schematically shown. DETAILED DESCRIPTION

[0009] The present application will be further described in detail with reference to the accompanying drawings. The following description is exemplary and is not intended to limit the present application. Those skilled in the art can think of other ways to achieve the present application on the basis of the preferred embodiments, and the other ways also fall within the scope of the present application.

[0010] In addition, the terms first, second, and the like used in the specification are merely used for distinguishing various objects for the purpose of clear description, and do not limit the size, number, or other order of the objects described. The directional terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely used for the purpose of facilitating the description of the present application, and do not indicate or imply that the objects referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0011] Figure 1 An embodiment of the filter device 1 according to the present application is schematically shown. The filter device 1 mainly comprises a housing 10, a filter body 18 arranged in the housing 10, a one-way valve 40, and connecting members. The connecting members are used to connect the above-mentioned components together, including joints, pipelines, etc. The components of the filter device 1 are correspondingly composed of materials that maintain stability and durability in a filtering environment.

[0012] The material to be filtered, such as a solid-liquid mixture, a solid-gas mixture, etc., can be transported into the housing 10 and separated into different components by the filter body 18. The separated components can be subjected to subsequent processing, such as drying or extraction, etc.

[0013] In Figure 2 An exploded view of the housing 10 of the filter device 1 is schematically shown in Figure 1 It can be seen from Figure 2 The body 121 of the top portion 12 and the body 161 of the bottom portion 16 can be exemplarily designed as hemispheres. The top portion 12 and the bottom portion 16 are detachably arranged at axially opposite ends of the barrel 13.

[0014] In order to connect the top 12, the barrel 13 and the bottom 16 to each other, the top 12, the barrel 13 and the bottom 16 are exemplarily provided with flanges 123, 140, 163, respectively, at the ends facing each other in the assembled state. In the flanges, a plurality of through-holes, which are not shown, are arranged distributed in the circumferential direction, and the top 12 and the barrel 13 and the barrel 13 and the bottom 16 are fixed to each other by a combination of threaded connections, i.e. bolts and nuts, associated with the respective through-holes.

[0015] In Figure 2 It is shown in that the barrel 13 of the housing 10 is formed by one cylindrical piece 131, i.e. the top 12 and the bottom 16 of the housing 10 are arranged at the axial ends of one cylindrical piece 131. However, the barrel 13 of the housing 10 can also be formed by a plurality of cylindrical pieces, i.e. cylindrical sub-sections, which can be connected to each other. For example, Figure 3 It is shown that the barrel 13 is formed by two cylindrical sub-sections 131, 132, which are configured with flanges 140 at the axial ends, in which a plurality of through-holes, which are not shown, are arranged distributed in the circumferential direction, and the cylindrical pieces are fixed to each other by a combination of threaded connections, i.e. bolts and nuts, associated with the respective through-holes. The plurality of cylindrical sub-sections is preferably designed at least substantially identically, which will also be explained below.

[0016] It is to be stated that, although it is explained above that the components of the housing 10 are fixed to each other by threaded connections, other suitable detachable fixed connections, such as clamping fixed connections, can also be selected.

[0017] In order to prevent leaks from the assembled housing, a sealing element, which is not shown, such as an O-ring, can be arranged at the connection sites of the components of the housing. Furthermore, it is preferred that as few openings as possible are provided in the components of the housing.

[0018] The filter body 18 is arranged at a suitable location of the housing. For example, the filter body 18 can be arranged at at least one of the barrel and the bottom, or between the barrel 13 and the bottom 16.

[0019] The filter body 18 can be in the form of a filter membrane, which can be composed of quartz, glass, stainless steel, ceramic or polytetrafluoroethylene, etc., depending on the type of the substance to be filtered. The size of the membrane pores of the filter membrane can be selected according to the substance to be filtered. The filter body 18 in the form of a filter membrane can be arranged tautly in the housing. When the pressure resistance of the filter body 18, e.g. the filter membrane, cannot withstand the pressure difference on both sides thereof in operation, the filter body 18 can be arranged in the housing supported by the carrier 17.

[0020] For example, as Figure 2As shown, the bottom 16 is provided with a recess 164 at its open side facing the cylinder 13, in which the carrier 17 can be placed, wherein the depth and cross section of the recess 164 are consistent with the thickness and cross section of the carrier 17, wherein the area of the cross section is larger than that of the inside of the cylinder, i.e. the recess can extend into the area of the flange, so that the carrier 17 in the recess and the filter membrane arranged on the carrier 17 can be kept in place by the flanges connected together. In the assembled state, the filter body 18 can be at the side of the carrier 17 facing the top 12 of the housing 10. The carrier 17 can be a glass sieve plate, a sand core plate or a stainless steel plate, etc., and of course the material of the carrier 17 also depends on the type of the material to be filtered.

[0021] In another example, as shown in Figure 3 When the cylinder 13 is composed of a plurality of cylindrical sub-sections, a recess 142 can be provided at the open side of at least one of the plurality of cylindrical sub-sections facing the top 12 of the housing 10, which can have the same configuration as the recess provided at the bottom, for which reference can be made to the above description. This enables to adjust the volume of the cylinder interior space as needed.

[0022] Of course, the filter body can also have other forms and installation manners according to the type and form of the material to be filtered.

[0023] By designing the housing 10 to have a plurality of detachably connected components as described above, and detachably installing the filter and the carrier when necessary, the filtered solid components can be taken out particularly conveniently, the components of the housing can be cleaned, the filter body can be replaced, etc. In addition, when the solids in the filtrate are attached in the carrier holes, the carrier can also be conveniently detached for deep cleaning, or the carrier can be directly replaced to quickly realize batch filtration.

[0024] Furthermore, the filter device 1 also comprises a non-return valve 40, preferably an adjustable non-return valve, which is arranged in the line connecting the input port 122 and the output port 162. In this regard, in the filter device 1 the housing 10 and the non-return valve 40 are connected in parallel. To this end, the non-return valve 40 is connected at a first end 401 to the input port 122 side of the housing 10, for example to the corresponding interface of the connection piece 201 assigned to the input port 122 of the housing 10, and at a second end 402 to the output port 162 side of the housing 10, for example to the corresponding interface of the connection piece 203 assigned to the collection container 50 connected to the output port 162 of the housing 10, so that the first end 401 of the non-return valve 40 can communicate with the upper space of the two spaces of the housing 10 separated by the filter body 18, i.e. the space close to the input port 122, and the second end 402 can communicate with the lower space of the two spaces of the housing 10 separated by the filter body 18, i.e. the space close to the output port 162. During operation of the filter device, the non-return valve opens when the pressure difference between the two ends of the non-return valve is greater than a predetermined threshold, which for example makes it possible for the fluid to flow through the non-return valve 40 (see arrow in Fig. 4) when the pressure present in the space of the housing 10 between the filter body 18 and the top 12 is too high, so that it is possible to maintain the desired pressure present in the space above the filter body 18 inside the housing. In this regard, constant pressure filtration is possible by means of the non-return valve. When the non-return valve is an adjustable non-return valve, it is also possible to set the above-mentioned pressure inside the housing by adjusting the adjustable non-return valve, which makes it possible for the filter device to be used more widely for filtering different substances to be filtered. Figure 1

[0025] Figure 1 It is also shown that the collection container 50 is connected via the connection piece 203 to the connection piece 202 assigned to the output port 162 of the housing by means of the line 302, and that a further connection piece 204 is arranged between the connection piece 203 and the non-return valve 40.

[0026] The connection piece 201 has a passage for the line 301 for introducing the substance to be filtered into the housing and a passage for the line 303 for communicating to the interior space of the housing. The connection piece 203 has a passage for communicating the interior space of the housing with the interior space of the collection container 50 and a passage for the line 305 for communicating to the interior space of the collection container 50. The connection piece 204 is provided so that the lines 304, 305, 306 communicate with one another.

[0027] ​Preferably, the inlet 122 can be designed to connect to a positive pressure source, i.e., to be subjected to positive pressure or to introduce pressurized material to be filtered into the housing; the outlet 162 can be designed to connect to a negative pressure source, i.e., to be subjected to negative pressure. Here, positive pressure refers to pressure higher than the external environment, and negative pressure refers to pressure lower than the external environment. For example, the positive pressure source can be an air pump that applies pressure to the container holding the material to be filtered, and the negative pressure source can be a vacuum pump. By providing a positive pressure source and / or a negative pressure source, it is beneficial to establish a pressure difference across the filter element within the housing to promote filtration.

[0028] Preferably, the filter device 1 further includes a temperature control device, namely a heating and / or cooling and / or heat preservation device, to improve filtration efficiency and filtration effect.

[0029] Preferably, a valve may be arranged in at least one of the aforementioned pipelines of the filter device 1 to intervene in the filtration process when necessary, such as interrupting filtration or maintaining the filter device.

[0030] The following describes the preparation of urea using filter device 1. 14 C form 14 Taking a C-labeled precursor compound as an example, the operation of the filter device 1 according to this invention will be explained.

[0031] Filtering urea - 14 At step C, the material to be filtered, i.e., urea containing barium sulfate precipitate with extremely small particle size that requires microporous filtration membrane, is... 14 The aqueous solution C is drawn into the filtration device through pipeline 301. At this time, positive pressure filtration or negative pressure filtration can be carried out in the filtration device. The pore size of the filter membrane is not greater than 0.45μm, preferably not greater than 0.1μm.

[0032] When using positive pressure filtration, the interior space of the housing is first connected to the outside via the line 306 connected to the outlet of the housing, and then the pressurized material to be filtered is introduced into the housing 10 via the inlet 122 through the line 301, so that the solid-liquid mixture is transferred into the interior space of the housing, and the filtration process is started, i.e. the filtrate is introduced into the collection container 50 after passing through the filter membrane. When the pressurized material to be filtered is being delivered, the gas present in the space between the filter membrane and the top of the housing can be discharged via the line 306 through the one-way valve 40 in the line 303, 304 connected in parallel to the housing, when the pressure value of the gas is greater than the opening pressure of the one-way valve 40, which makes the entire filling process independent of the gas in the space above the filter membrane and the housing. During filling, it should be ensured that the material to be filtered in the housing does not exceed the volume of the housing above the filter membrane, in order to prevent the material to be filtered from entering the line 303. If the filtration is slow and the filling rate exceeds the filtration rate, the filling can be carried out in an intermittent manner. After the filling of the material to be filtered is completed, a positive pressure gas, for example a liquid protective gas such as nitrogen, argon, etc., can be continuously supplied to the housing through the line 301. During the operation of the filtration device, the pressure in the space of the housing formed between the filter membrane and the top of the housing is set and maintained to be at least 5 KPa, preferably at least 10 KPa, higher than the pressure in the space of the housing formed between the filter body and the bottom of the housing, under which pressure difference the material to be filtered and, if necessary, the liquid protective gas is continuously delivered to the housing and filtered. Here, the one-way valve or the adjustable one-way valve can be selected according to the above-mentioned pressure difference. Constant pressure filtration is achieved by this pressure difference. In this way, the material to be filtered can be repeatedly added for filtration, or a cleaning liquid can be added for cleaning, etc. After the filtration and cleaning processes are completed, for example, high-purity nitrogen, argon or other suitable gases can be introduced for the sealed drying of the solid filtered product. After the process is completed, the filtrate and the solid product are obtained.

[0033] In the case of negative pressure filtration, first, the pipe 306 connected with the negative pressure source, such as a vacuum pump, is communicated with the interior space of the shell, so that the gas in the interior space of the shell can be extracted to generate a certain vacuum degree in the interior space of the shell, thereby the to-be-filtered material, which can be under normal pressure, i.e. atmospheric pressure, can be sucked into the shell through the pipe 301. During the filtration, the vacuum degree in the shell can be maintained or adjusted by the one-way valve 40 in the pipes 303, 304 connected in parallel with the shell. During the operation of the filtration device, the pressure in the space of the shell formed between the filter membrane and the top of the shell is set to be at least 5 KPa higher than the pressure in the space of the shell formed between the filter body and the bottom of the shell, preferably at least 10 KPa higher, so that the to-be-filtered material and the liquid protective gas, if necessary, can be continuously delivered into the shell and filtered under this pressure difference. At this time, due to the one-way valve arranged, the pressure on the input side of the filter membrane is always greater than the pressure on the output side, so that the pressure on the output side is prevented from being greater than the pressure on the input side due to misoperation, thereby avoiding the failure of the filter membrane being burst open and the like. After the feeding is completed, the negative pressure filtration can be directly performed until the filtration process is completed. The whole process can be continuously and automatically completed, and only the vacuum degree needs to be controlled. Through the continuous vacuum, the vacuum drying of the solid filtered product can also be realized at the same time. On the other hand, a negative pressure can also be generated in the collection container 50 connected with the shell 10, which also helps to automatically perform the whole filtration process until the filtration process is completed. After the filtration is completed, if necessary, the liquid for cleaning can also be sucked from the input port through the negative pressure to perform washing.

[0034] The above-mentioned positive pressure filtration and negative pressure filtration can also be used in combination in the proposed filtration device, i.e. the to-be-filtered material subjected to positive pressure is pressed into the shell 10 through the input port via the pipe 301, and the pipe 306 communicated with the interior space of the shell is connected with a negative pressure source, such as a vacuum pump, because no matter the positive pressure filtration, the negative pressure filtration or the combined filtration of the two, the one-way valve in the filtration device is opened when the pressure at the first end part thereof is greater than the pressure at the second end part by a predetermined value, thereby the set pressure difference in the spaces on both sides of the filter membrane of the shell can be maintained, preferably the pressure in the space of the shell formed between the filter membrane and the top of the shell is at least 5 KPa higher than the pressure in the space of the shell formed between the filter body and the bottom of the shell, preferably at least 10 KPa higher.

[0035] In the case of arranging a single-layer filter membrane, the single-layer filtration can be performed in the filtration device according to the present application. If it is necessary to further improve the filtration precision, the filtration device can adopt a shell Figure 2 , thereby realizing multi-layer filtration.

[0036] After the filtration process is completed, the urea- 14The aqueous solution can be transferred from the pipe into a rectification bottle to remove water to obtain solid urea 14 C The entire process is carried out in a sealed manner, which greatly reduces 14 C diffusion into the environment.

[0037] In order to control the amount of the substance to be filtered which is added to the housing, a sensor for detecting the filling level of the substance to be filtered in the housing can be provided in the housing of the filter device. When the sensor detects that the filling level is above a predetermined value, the addition of the substance to be filtered can be interrupted. The interruption can be carried out automatically or manually

[0038] When the filter device is provided with a temperature control device, it is also possible to heat, cool or insulate by means of the temperature control device during the filtration and, if necessary, the subsequent drying, in order to promote the filtration process and possibly the drying process.

[0039] The filter device according to the application can also be used for separating and purifying barium carbonate- 14 C. In this case, the entire filtration process is carried out in the same way as for the substance to be filtered which contains urea- 14 C. The barium carbonate- 14 C suspension is transferred from the settling column into the housing of the filter device, wherein, during the filtration, the pressure in the space of the housing of the filter device above the filter membrane is set and maintained at a predetermined value greater than the pressure in the space of the housing below the filter membrane, for example, there is a pressure difference of at least 5 KPa, preferably at least 10 KPa, between the two spaces, at which pressure difference the continuous automatic transfer and filtration of the substance to be filtered takes place.

[0040] The following effects can be achieved by means of the filter device according to the application.

[0041] A completely sealed filtration and automated filtration can be achieved. By adjusting the pressure difference between the substance to be filtered supply device (for example, a temporary storage container for a solid-liquid mixture) and the housing of the filter device, the transfer of the material can be achieved. On the other hand, by adjusting the pressure difference between the housing of the filter device and the collection container, filtration and washing can be achieved.

[0042] Extremely small particles can be filtered efficiently without the need to increase the area of the filter membrane, thus reducing waste.

[0043] The filter device is particularly suitable for the filtration of radioactive materials. Depending on the properties of the material to be filtered, the filter device can be made of suitable materials, including but not limited to stainless steel or other alloys, glass, quartz, ceramics, polytetrafluoroethylene or other plastics.

[0044] Most of the components of the filter device according to the application can be reused, and the amount of filter membrane used is small, and thin filter membranes can meet the requirements, which is particularly important in the field of radioactivity. The ease of disassembly of the device also makes cleaning much easier.

[0045] The filter device according to the application can filter various forms of to-be-filtered substances, for example, for solid-liquid filtration, solid-gas filtration, etc., such as removing solids by filtration, for removing liquids by filtration, etc.

[0046] The filter device according to the application can be single-layer filtration or multi-layer filtration.

[0047] It is to be understood that the features or feature combinations of the device according to the application described above and mentioned and / or only shown in the drawings can not only be used in the combinations given above, but also in other combinations or alone, without leaving the scope of the application.

[0048] The application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the application to the scope of the described embodiments. Those skilled in the art should understand that more variations and modifications can be made according to the teachings of the application, and these variations and modifications all fall within the scope of the application.

Claims

1. Filtration device (1), characterized in that, The filter device (1) comprises a housing (10) having a top part (12) provided with an inlet opening (122), a barrel (13) and a bottom part (16) provided with an outlet opening (162), the top part (12) and the bottom part (16) being arranged detachably at axially opposite ends of the barrel (13), a filter body (18) arranged in the housing (10), a non-return valve (40) arranged in a line connected to the inlet opening (122) and the outlet opening (162), wherein the inlet opening (122) is designed to be connectable to a positive pressure source and / or the outlet opening (162) is designed to be connectable to a negative pressure source, and the positive pressure source and / or the negative pressure source are able to establish a predetermined pressure difference in the space of the housing separated by the filter body (18).

2. The filter device (1) according to claim 1, characterized in that, The barrel (13) comprises a plurality of cylindrical sub-sections which are detachably connected to one another.

3. The filter device (1) according to claim 2, characterized in that The filter body (18) is supportedly held at the sub-sections and / or the bottom part (16) by a carrier (17).

4. The filter device (1) according to claim 3, characterized in that The filter body (18) is a filter membrane.

5. The filter device (1) according to claim 4, characterized in that The filter membrane is arranged on a side of the carrier (17) facing the inlet opening (122).

6. The filter device (1) according to claim 4, characterized in that The filter membrane has a pore size of not more than 0.1 µm.

7. The filter device (1) according to any one of claims 1 to 6, characterized in that The non-return valve (40) is an adjustable non-return valve.

8. The filter device (1) according to any one of claims 1 to 6, characterized in that The filter device (1) is provided with a temperature regulating device.

9. The filter device (1) according to any one of claims 1 to 6, characterized in that The filter device (1) further comprises further lines, wherein a valve is arranged in at least one of the lines.

10. The filter device (1) according to any one of claims 1 to 6, characterized in that The filter device (1) has a sensor for detecting a fill level of the substance to be filtered in the housing (10).

11. The filter device (1) according to any one of claims 1 to 6, characterized in that The non-return valve (40) is an adjustable non-return valve.

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