Sodium chlorate solution filter

Abstract

According to the sodium chlorate solution filter provided by the utility model, the structure of the sodium chlorate solution filter is improved, so that the filtering effect and the filtering efficiency of the sodium chlorate solution filter are improved. The sodium chlorate solution filter comprises a shell, a solution inlet pipe, a solution outlet pipe and a plurality of filter sticks, wherein the solution inlet pipe and the solution outlet pipe are communicated with the shell, the filter sticks are arranged in the shell, each filter stick comprises a supporting cylinder with an inner cavity, a plurality of liquid inlet holes are formed in the cylinder wall of each supporting cylinder, and the filter screens cover the liquid inlet holes; and the inner cavity of the supporting cylinder is directly or indirectly communicated with the solution outlet pipe. By the adoption of the sodium chlorate solution filter, the temperature resistance of the sodium chlorate solution filter can be remarkably improved, and the filtering effect and efficiency of the filter are improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a sodium chlorate solution filter. Background Technology

[0002] In the chemical industry, the filtration of sodium chlorate solution is an important process. Filters are commonly used to filter sodium chlorate solutions; however, commercially available filters often have poor filtration performance and low filtration efficiency. Improving the filtration effect and efficiency of filters has been a long-standing pursuit for those skilled in the art. Utility Model Content

[0003] The purpose of this invention is to provide a sodium chlorate solution filter, which improves the filtration effect and efficiency by modifying the structure of the sodium chlorate solution filter.

[0004] To achieve the above objectives, this utility model provides a sodium chlorate solution filter. The sodium chlorate solution filter includes a shell, a solution inlet pipe and a solution outlet pipe communicating with the shell, and a plurality of filter rods disposed within the shell. Each filter rod includes a support cylinder with an inner cavity and a plurality of liquid inlet holes on the cylinder wall, and a filter screen covering the liquid inlet holes. The inner cavity of the support cylinder is directly or indirectly connected to the solution outlet pipe.

[0005] By using the sodium chlorate solution filter of this application, the temperature resistance of the sodium chlorate solution filter can be significantly improved, thereby enhancing the filtration effect and efficiency.

[0006] Optionally, it also includes several filtration units, each filtration unit including a filter rod, and each filtration unit can be connected to or disconnected from the solution outlet pipe.

[0007] Optionally, each filter unit includes one or more manifolds;

[0008] Several manifolds are connected to the solution outlet pipe via adapters.

[0009] A sodium chlorate solution filter includes a housing, a solution inlet pipe and a solution outlet pipe communicating with the housing, and a plurality of filter units for filtering the solution inside the housing, each filter unit being connected to or disconnected from the solution outlet pipe.

[0010] Optionally, the filtration unit includes a filter rod, which includes a filter screen and a support cylinder defining an inner cavity that is directly or indirectly connected to a solution outlet pipe.

[0011] The support cylinder has several liquid inlet holes on its wall, and a filter screen covers the liquid inlet holes.

[0012] Optionally, the filter screen is fitted onto the support cylinder and detachably connected to the support cylinder.

[0013] Optionally, the filter screen is made of polytetrafluoroethylene or polyvinylidene fluoride.

[0014] Optionally, the support cylinder is made of pure titanium.

[0015] Optionally, it also includes a backwash water inlet pipe and a first drainage device for driving the filtered solution outward;

[0016] One of the backwash water inlet pipe and the first diversion device may be selectively connected to the solution outlet pipe.

[0017] Optionally, the filter unit is also provided with a sight glass, which is located downstream of the location where each filter rod connects to the manifold.

[0018] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0020] Figure 1 This is a schematic diagram of the structure of the sodium chlorate solution filter in an embodiment of this utility model;

[0021] Figure 2 yes Figure 1 The enlarged schematic diagram of a portion of the structure shows the structure of the filter unit inside the housing.

[0022] Figure label:

[0023] 1-Solution outlet pipe; 2-Backwash water inlet pipe; 21-First valve; 3-Shell; 31-Equal diameter section; 32-Conical section; 4-Filter unit; 41-Filter rod; 42-Manifold; 43-Sight glass; 44-Adapter; 5-Solution inlet pipe; 6-Third valve; 7-Drain pipe; 71-Vertical section; 72-Level monitoring switch; 8-Process gas inlet pipe; 81-Second valve; 91-Pre-filter pressure detection device; 92-Post-filter pressure detection device. Detailed Implementation

[0024] This invention provides a sodium chlorate solution filter, which significantly improves the filtration effect and efficiency by improving the structure of the sodium chlorate solution filter.

[0025] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0027] Figure 1 This is a schematic diagram of the structure of the sodium chlorate solution filter in an embodiment of this utility model; Figure 2 yes Figure 1 The enlarged schematic diagram of a part of the structure shows the structure of the filter unit inside the housing and the flow direction of the solution when the filter is in filtration mode.

[0028] Example 1

[0029] Traditional filters typically use filter media with limited temperature resistance. In high-temperature solution filtration scenarios, commercially available filters are prone to performance degradation, damage, or even failure due to their inability to withstand the high temperatures. This not only affects the filtration effect and efficiency but may also lead to production interruptions, increasing production costs and time.

[0030] Specifically, most filter rods on the market are made of ceramic material, which has several filter holes to filter solutions. However, ceramic material expands when used in high-temperature environments, and the pore size changes with temperature, thus affecting the filtration effect and efficiency of the filter.

[0031] As shown in the figure, to achieve the above objective, this utility model provides a sodium chlorate solution filter, including a solution outlet pipe 1, a housing 3, and a plurality of filter rods 41 disposed within the housing 3. The filter rods 41 are located inside the housing 3 and are used to filter the solution located inside the housing 3. The filtered solution enters the solution outlet pipe 1 through the outlet of the filter rods 41 and is supplied to the outside through the solution outlet pipe 1.

[0032] Specifically, each filter rod 41 includes a support cylinder and a filter screen (not fully shown in the figure) connected to the support cylinder. The support cylinder supports the filter screen. The support cylinder has an inner cavity, which is directly or indirectly connected to the solution outlet pipe 1, and the outlet of the filter rod 41 is connected to the inner cavity. The cylinder wall of the support cylinder also has several liquid inlet holes, which are used to connect the inner cavity to the outside of the support cylinder, that is, to the inner cavity of the shell.

[0033] The filter screen covers the liquid inlet hole. The filter screen can be sleeved on the outside of the support cylinder and clamped within it, or it can be directly installed on the liquid inlet hole to cover it. Those skilled in the art can choose the appropriate method as needed. The filter screen is made of flexible material and has several mesh openings for filtering impurities in the solution. The support cylinder is made of metal to support the filter screen.

[0034] In a more specific example, the support cylinder can be a cylindrical structure formed by a plate-like structure, with several through holes machined into the cylinder wall as liquid inlet holes. A filter screen covers these inlet holes, allowing the solution passing through the filter screen to enter the inner cavity of the cylindrical structure. Alternatively, the support cylinder can be a cylindrical frame structure formed by several rods, with the rods forming liquid inlet holes, which are also covered by a filter screen.

[0035] By using the sodium chlorate solution filter of this application instead of commercially available ceramic filter rods, and using a filter screen as the filter component, and using a support cylinder to support the filter screen, the temperature resistance of the sodium chlorate solution filter can be significantly improved. Even at high temperatures, the thermal expansion of the filter screen of filter rod 41 is relatively limited, thereby improving the filtration effect and efficiency of the filter.

[0036] The filter screen is made of polytetrafluoroethylene (PTFE) or polyvinylidene fluoride (PVDF), and the support cylinder is made of pure titanium. For example, the filter screen is a seamless cylindrical filter screen woven from PTFE. PTFE has excellent high-temperature resistance, maintaining stable physical and chemical properties in high-temperature environments, thus effectively solving the problem of traditional filter media's inability to withstand high temperatures. This new type of filter screen also has good chemical stability, resisting corrosion from sodium chlorate solution and extending the filter's service life.

[0037] The support cylinder is made of pure titanium, where pure titanium refers to titanium content of 99% or higher, without the addition of other metals, but trace amounts of impurities such as oxygen, iron, and nitrogen are permissible without affecting the basic properties of the material. Alternatively, the titanium material of the support cylinder in this application has a titanium content of approximately 99.8% or higher to ensure its corrosion resistance. This approach improves the structural strength, temperature resistance, and corrosion resistance of the filter rod 41; furthermore, it meets the needs of large-scale production of the filter rod 41.

[0038] In the technical solution of this application, the sodium chlorate solution filter further includes several manifolds 42, each manifold 42 is connected to at least one filter rod 41, and the manifold 42 is connected to the solution outlet pipe 1.

[0039] In commercially available technical solutions, a disc-shaped manifold is installed on the top of the housing 3, and each ceramic filter rod 41 is connected to the same manifold.

[0040] In the technical solution of this application, a plurality of manifolds 42 are provided. Each manifold 42 can be individually connected to the solution outlet pipe 1, or several manifolds 42 can be grouped together and connected to the solution outlet pipe 1 via an adapter 44. Each manifold 42 is connected to at least one filter rod 41. In the example shown in the figure, two manifolds 42 are grouped together and connected to the solution outlet pipe 1 via an adapter 44. This connection method reduces the number of openings in the solution outlet pipe 1.

[0041] In some examples, the filter includes several filter units 4, each filter unit 4 including a manifold 42 or several manifolds (42). When each manifold 42 is individually connected to the solution outlet pipe 1, a single manifold 42 and the filter rod 41 connected thereto constitute a filter unit 4; when several manifolds 42 are grouped together, several manifolds 42 connected to the solution outlet pipe 1 via the same adapter 44 and the filter rod 41 connected to these manifolds 42 constitute a filter unit 4.

[0042] In such Figure 2 In the example shown, two manifolds 42 form a filter unit 4, which is connected to the solution outlet pipe 1 via an adapter 44. In the illustrated example, the manifold 42 is a straight pipe, and four or five filter rods 41 can be arranged along its extension direction. Of course, other numbers of filter rods 41 can also be arranged, with each filter rod 41 spaced apart along the extension direction of the manifold 42. Naturally, the manifold 42 can also be of other shapes, which can be selected by those skilled in the art as needed.

[0043] By connecting the manifold 42 to the solution outlet pipe 1, the flow of the solution becomes smoother and the pressure distribution becomes more uniform.

[0044] On the other hand, filter rods 41 of commercially available filters can become clogged during long-term use. However, since all filter rods 41 are connected to the manifold at the top of the housing 3, it is impossible to determine which filter rods 41 are clogged. During maintenance and flushing, all filter rods 41 need to be flushed, which reduces the filtration efficiency and filtration effect of the filter.

[0045] In one specific embodiment, the sodium chlorate solution filter includes the aforementioned plurality of filter units 4 and a third valve 6. The connection and disconnection between each filter unit 4 and the solution outlet pipe 1 are achieved by controlling the opening and closing of the third valve 6. Each filter unit 4 includes at least one manifold 42 connected to the solution outlet pipe 1 and at least one filter rod 41 connected to the corresponding manifold 42.

[0046] In one example, when each manifold 42 is individually connected to the solution outlet pipe 1, a third valve 6 is provided at a second position of each manifold 42. In the direction of solution flow, the second position is located downstream of the position of the manifold 42 connected to the filter rod 41.

[0047] In another example, when several manifolds 42 (including two and an integer greater than 2) are connected to the solution outlet pipe 1 via adapter 44, a third valve 6 is provided at the adapter 44.

[0048] By installing a third valve 6 on each of the manifolds 42, individual control of the filter unit 4 is achieved, thereby improving the filtration effect of the equipment and increasing the efficiency of maintenance. In other words, during the flushing process, one or more filter units 4 can be flushed individually.

[0049] Example 2

[0050] The technical solution of this application also provides a sodium chlorate solution filter, including a solution outlet pipe 1, a housing 3, and a plurality of filter units 4. Each filter unit 4 includes at least one manifold 42 connected to the solution outlet pipe 1 and at least one filter rod 41 connected to the corresponding manifold 42. The filter rod 41 is located inside the housing 3. The manifold 42 is connected to the housing 3 through the filter rod 41. Each filter unit 4 can be connected to or disconnected from the solution outlet pipe 1. Specifically, referring to the foregoing, the filter unit 4 can be controlled by setting a third valve 6.

[0051] By adopting this method, the connection and disconnection status of each filter unit 4 can be individually controlled. In addition, this method also makes the solution flow smoother and the pressure distribution more uniform, thereby improving the filtration effect and stability of the filter.

[0052] As an alternative, each filter rod 41 includes a support cylinder and a filter screen fitted onto the support cylinder. The support cylinder has an inner cavity, and the cylinder wall of the support cylinder is also provided with several liquid inlet holes. The filter screen covers the liquid inlet holes. The inner cavity is directly or indirectly connected to the solution outlet pipe 1. The filter screen is made of polytetrafluoroethylene, and the support cylinder is made of pure titanium.

[0053] By using the sodium chlorate solution filter of this application, the temperature resistance of the sodium chlorate solution filter can be significantly improved, thereby enhancing the filtration effect and efficiency.

[0054] The difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 modifies the flow channel within the housing 3, thereby enabling individual control of the filter unit 4. This improves the filter's efficiency and filtration effect from the perspective of filter maintenance. Embodiment 1 improves the structure of the filter rod 41 by enhancing its temperature resistance, thus improving filtration effect and efficiency. Implementing either embodiment alone can improve the filter's filtration effect and efficiency. In other words, in the technical solution of Embodiment 2, even if the filter rod 41 uses a traditional ceramic structure or another type of structure, the technical effect of Embodiment 2 can be achieved. Using both embodiments in combination can further improve the filter's filtration effect and efficiency.

[0055] The two embodiments described above will be further explained below. The technical solutions described below can be applied to any one of the two embodiments or the technical solutions of the combination of the two embodiments.

[0056] In some other embodiments of this application, the solution outlet pipe 1 has a first position, which is also connected to the backwash water inlet pipe 2. In the flow direction of the solution, the first position is located downstream of each manifold 42. The backwash water inlet pipe 2 is provided with a first valve 21. The sodium chlorate solution filter has a filtration mode and a flushing mode. In the filtration mode, the first valve 21 is closed, and in the flushing mode, the first valve 21 is open.

[0057] In a specific example, to support this embodiment, the sodium chlorate solution filter further includes a first drainage device and a second drainage device (neither shown in the figure). The drainage devices are used to guide the liquid to flow in a predetermined direction. During filtration, the first drainage device guides the solution within the housing 3 from the outside of the filter rod 41 to the inside of the filter rod 41, and then sequentially through the manifold 42 and the solution outlet pipe 1. During rinsing, the second drainage device guides the rinsing water sequentially through the solution outlet pipe 1—manifold 42—the inner cavity of the filter rod 41—and the outside of the filter rod 41 within the housing 3. Those skilled in the art can choose either the first or second drainage device; their installation positions are not limited here, as long as the predetermined flow direction of the solution and rinsing water can be achieved.

[0058] In this embodiment, by providing a backwash water inlet pipe 2 to the solution outlet pipe 1, the filter rod 41 can be backwashed using the solution outlet pipe 1, thereby achieving automatic backwashing in a single flow channel, improving the backwashing effect, reducing the number of pipelines, and simplifying the filter structure.

[0059] In another embodiment, the housing 3 is also provided with a drain port, which is located at the lowest position of the housing 3 to facilitate the discharge of sewage under its own weight. The drain port is also connected to a drain pipe 7, which is used to connect or disconnect from the outside. By providing the drain pipe 7, the solution can be stored inside the housing 3. When in rinsing mode, opening the drain pipe 7 can discharge the rinsed sewage from inside the housing 3.

[0060] In the example shown, the drain pipe 7 includes a vertical section 71 directly connected to the drain outlet. A liquid level monitoring switch 72 is installed in the vertical section 71. The liquid level monitoring switch 72 changes its state when the backwash liquid level is lower than a set position. The drain pipe 7 has a vertical section 71, and the liquid level within the vertical section 71 is detected. When the liquid level is lower than the set position, the state of the liquid level monitoring switch 72 changes as a basis for determining whether the wastewater inside the casing 3 has been drained.

[0061] In some other embodiments of this application, the housing 3 is also connected to a process gas inlet pipe 8, which is used to connect to or disconnect from a compressed gas supply device. By providing the process gas inlet pipe 8, the venting of the housing 3 can be more thorough during flushing operations. The type of process gas can be selected by those skilled in the art, and no particular limitation is made here.

[0062] Optionally, the sodium chlorate solution filter further includes a pre-filtration pressure detection device 91 and a post-filtration pressure detection device 92. The pre-filtration pressure detection device 91 is located in the housing 3 and is used to detect the pressure of the solution outside the filter rod 41. The post-filtration pressure detection device 92 is located in the solution outlet pipe 1 and is used to detect the pressure of the solution inside the solution outlet pipe 1. By setting the pre-filtration pressure detection device 91 and the post-filtration pressure detection device 92, the pressure of the solution before filtration and the pressure of the solution after filtration can be compared to determine the clogging status of the filter rod 41, so as to backwash in time to regenerate the filter. At the same time, by detecting the pre-filtration pressure and the post-filtration pressure of the solution, during the filtration of sodium chlorate solutions with different concentrations and impurity contents, the stability of the filtration effect and the consistency of product quality can be judged by using the pre-filtration pressure and the post-filtration pressure as a reference.

[0063] In the aforementioned embodiments, the housing 3 includes a constant-diameter section 31 and a tapered section 32, with the constant-diameter section 31 connected to the bottom of the tapered section 32. The filter rod 41 is located within the constant-diameter section 31, and the lowest point of the filter rod 41 is aligned horizontally with the bottom of the tapered section 32. The apex of the cone is the vertex of the tapered structure, where all tapered surfaces originating from the bottom converge. The bottom of the cone is the plane in the tapered structure opposite to the apex.

[0064] The constant diameter section 31 is a cylindrical structure, and its inner diameter remains consistent along the axial direction. The filter rod 41 is arranged along the axis, and the manifold 42 is located above the constant diameter section 31 and connected to the top of the filter rod 41. The bottom of the filter rod 41 is located at the junction of the tapered section 32 and the constant diameter section 31. The bottom of the tapered section 32 is connected to the constant diameter section 31, and the top of the tapered section 32 is located at the lowest position of the shell 3, meaning the tapered section 32 is in an inverted state, with the top of the tapered section located below the bottom of the tapered section.

[0065] Therefore, during the rinsing process, the sewage inside the housing 3 can be completely drained, ensuring the rinsing effect of the filter rod 41.

[0066] In the aforementioned embodiments, the filtration unit 4 is further provided with a sight glass 43, which is located downstream of the position where each filter rod 41 connects to the manifold 42. The sight glass 43 is used to observe the filtered solution of the filtration unit 4.

[0067] Specifically, the manifold 42 has a third position, where a sight glass 43 is installed. This third position is located downstream of each filter rod 41 connected to the manifold 42 in the direction of solution flow. The sight glass 43 is made of a light-transmitting material, such as glass. Alternatively, when the manifold 42 is connected to the solution outlet pipe 1 via an adapter 44, the sight glass 43 can also be installed on the adapter 44. The sight glass 43 installed in the filter unit 4 is used for daily visual inspection of the cleanliness of the filtered solution to determine whether the filter screen is damaged.

[0068] In the aforementioned embodiments, in order to reduce maintenance and replacement costs, the filter rod 41 adopts a standardized design, and the filter screen and support cylinder are detachably connected, which facilitates the replacement of the filter screen and reduces maintenance time and costs.

[0069] The following describes one possible use of this application in a specific manner. The housing 3 is also connected to a solution inlet pipe 5, which is used to inject the sodium chlorate solution to be filtered into the housing 3. As the solution passes through the filter screen into the inner cavity of the filter rod 41, the filter screen traps impurities in the solution. The filtered solution enters the solution outlet pipe 1 through the manifold 42. The operator can observe the clarity of the filtrate in each filter unit 4 through the sight glass 43 to determine the degree of clogging of the filter screen in the corresponding filter unit 4.

[0070] At the same time, the pressure of the solution before filtration and the pressure of the solution after filtration are detected. When the pressure difference between the two does not reach the set threshold, even if some of the filter units 4 are blocked, there is no need to flush the filter.

[0071] When the pressure difference between the two reaches the set threshold, the filter is flushed. During the flushing process, the clarity of the filtered solution observed by the sight glass 43 of a single filter unit 4 can be used to select one or several filter units 4 to be flushed. In this process, several filter units 4 can be flushed at the same time, or each filter unit 4 can be flushed sequentially. Those skilled in the art can choose the flushing method themselves.

[0072] Before rinsing, process gas can be introduced into the shell 3 to remove any residual sodium chlorate solution. After rinsing, process gas can also be introduced to remove wastewater.

[0073] In some more specific embodiments, the process gas inlet pipe 8 is also equipped with a second valve 81, which is controlled by a control signal to close, disconnecting the process gas inlet pipe 8 from the housing 3. This control signal includes a signal generated by the liquid level monitoring switch 72. That is, when the liquid level monitoring switch 72 detects that the liquid level is below a set threshold, the second valve 81 is closed. This control method is suitable for both solution discharge and wastewater discharge.

[0074] By adopting the embodiments of this application, the temperature resistance of the filter rod 41 is significantly improved, the operating temperature of the filter is increased from 55°C to 85°C, the applicable temperature range of the filter is significantly improved, and the filtration effect and efficiency of the filter are improved.

[0075] In addition, the structure of the filter rod 41 formed by using a support cylinder to support the filter screen significantly improves the structural strength of the filter rod 41 and solves the problem of easy breakage of ceramic filter rods 41 on the market.

[0076] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A sodium chlorate solution filter, characterized in that, The device includes a housing (3), a solution inlet pipe (5) and a solution outlet pipe (1) connected to the housing, and a filter rod (41) disposed in the housing (3). The filter rod (41) includes a support cylinder with an inner cavity and the cylinder wall of the support cylinder is provided with a plurality of liquid inlet holes and a filter screen covering the liquid inlet holes. The inner cavity of the support cylinder is directly or indirectly connected to the solution outlet pipe (1).

2. The sodium chlorate solution filter according to claim 1, characterized in that, It also includes several filter units (4), each of which includes several filter rods (41), and each of the filter units (4) can be connected to or disconnected from the solution outlet pipe (1).

3. The sodium chlorate solution filter according to claim 2, characterized in that, Each of the filter units (4) includes one manifold (42) or several manifolds (42); Several manifolds (42) are connected to the solution outlet pipe (1) via adapters.

4. A sodium chlorate solution filter, characterized in that, It includes a housing (3), a solution inlet pipe (5) and a solution outlet pipe (1) connected to the housing, and a plurality of filter units (4) for filtering the solution in the housing (3). Each filter unit (4) includes a plurality of filter rods (41), and each filter unit (4) can be connected to or disconnected from the solution outlet pipe (1).

5. A sodium chlorate solution filter according to claim 4, characterized in that, The filter rod (41) includes a filter screen and a support cylinder that defines an inner cavity, and the cylinder wall of the support cylinder is provided with a plurality of liquid inlet holes, and the filter screen covers the liquid inlet holes; the inner cavity is directly or indirectly connected to the solution outlet pipe (1).

6. The sodium chlorate solution filter according to any one of claims 1-5, characterized in that, The filter screen is sleeved on the support cylinder and detachably connected to the support cylinder.

7. The sodium chlorate solution filter according to any one of claims 1-5, characterized in that, The filter screen is made of polytetrafluoroethylene or polyvinylidene fluoride.

8. The sodium chlorate solution filter according to any one of claims 1-5, characterized in that, The support cylinder is made of pure titanium.

9. The sodium chlorate solution filter according to any one of claims 1-5, characterized in that, It also includes a backwash water inlet pipe (2) and a first drainage device for driving the filtered solution outward; One of the backwash water inlet pipe (2) and the first diversion device may be selectively connected to the solution outlet pipe (1).

10. The sodium chlorate solution filter according to any one of claims 2-5, characterized in that, The filter unit (4) is also provided with a sight glass (43), which is located downstream of each of the filter rods (41) in the direction of solution flow.

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