Filter and filtering system

Abstract

A filter and a filtering system, characterized in that the housing comprises a cylinder and an upper cover plate and a lower cover plate detachably mounted on the upper and lower ends of the cylinder, the filter element assembly comprises a first filter element and a second filter element, the first filter element is loaded into the cavity from bottom to top, the second filter element is loaded into the cavity from top to bottom, and the lower end of the second filter element extends to the inside of the first filter element, the filter forms a lower interface, a first fluid channel, a second fluid channel, a third fluid channel, and an upper interface which are connected in sequence, and a pressure port connected to the second fluid channel is also formed on the housing. Its advantages are: 1. It can achieve step-by-step filtration with good filtering effect; 2. The structure is more compact, small in size, and small in area; 3. The first filter element and the second filter element are separately arranged and can be independently disassembled and assembled without interfering with each other, which is not only more convenient to disassemble and assemble, but also reduces costs; 4. It is easy to judge the faulty filter element, so as to achieve accurate replacement.

Description

Technical Field

[0001] The present invention relates to the field of filtering technology, and in particular to a filter and a filtering system. Background Art

[0002] The filter is used to remove suspended matter and particulate matter from the water to reduce turbidity and purify the water quality, and also to reduce the generation of dirt, algae and rust, etc., to ensure the effect of purifying the water quality and protect the normal operation of other equipment in the system. In order to ensure the filtering effect, multi-stage filtering is usually set, and the filtering accuracy ranges from coarse to fine.

[0003] Usually, there are two conventional methods to achieve multi-stage filtration. The first method is to set multiple filters in series on the fluid pipeline. However, the more filters there are, the more space they occupy. The second method is to use a composite filter element with multi-stage filtration function to reduce the number of filters. However, most of these composite filter elements are integral structures. When one layer of filtration fails, it needs to be replaced as a whole, so the cost of use is relatively high.

[0004] For example, Chinese utility model patent CN219308121U discloses a multi-core filter that is easy to disassemble and assemble. Its filter element assembly adopts a two-stage filter element, including a first filter element and a second filter element arranged on a connecting plate. The filtering accuracy of the first filter element is greater than the filtering accuracy of the second filter element. When filtering, it is usually filtered through the second filter element first, and then filtered through the first filter element for a second time, realizing step-by-step filtration and improving the filtering performance.

[0005] The first filter element and the second filter element adopt an integrated structure. Although it is convenient to disassemble and replace the entire filter element, the filtering accuracy of the first filter element and the second filter element are different, and their service life is also different. Once one of the first filter element or the second filter element fails and needs to be replaced, the entire filter element assembly needs to be replaced, resulting in very high use costs.

[0006] Another example is a composite filter assembly in which inner and outer filter elements can rotate relative to each other, disclosed in Chinese invention patent CN109847431A. In one embodiment, the external filter element and the internal filter element can be separated and disassembled. However, when replacing the filter element, it is still necessary to first remove the entire filter element from the filter, and then separate and disassemble the external filter element and the internal filter element, which is relatively troublesome. In addition, when the filter element is blocked and needs to be replaced, it is often impossible to determine whether it is the external filter element or the internal filter element that is faulty by direct observation, so it can only be replaced as a whole. Summary of the invention

[0007] In order to overcome the shortcomings of the background technology, the present invention provides a filter and a filtering system.

[0008] The technical solution adopted by the present invention is: a filter, comprising a housing and a filter element assembly arranged inside the housing, wherein the upper portion of the housing has an upper interface, and the lower portion of the housing has a lower interface;

[0009] The housing comprises:

[0010] The cylinder has a cavity with openings at both upper and lower ends;

[0011] An upper cover plate, which is detachably mounted on the upper end of the cylinder;

[0012] A lower cover plate, which is detachably mounted on the lower end of the cylinder;

[0013] The filter element assembly comprises:

[0014] The first filter element comprises a first filter part and a first upper end cover and a first lower end cover respectively disposed at two ends of the first filter part, the first upper end cover is formed with a first through hole, the first lower end cover is closed, the first filter element is inserted into the cavity from the lower end opening of the cylinder, and the first upper end cover is kept in sealing cooperation with the cylinder;

[0015] The second filter element comprises a second filter part and a second upper end cover and a second lower end cover respectively disposed at two ends of the second filter part, the second upper end cover is formed with a second through hole, the second lower end cover is closed, the second filter element is loaded into the cavity from the upper end opening of the cylinder body, and the lower end of the second filter element passes through the first through hole and extends to the interior of the first filter element;

[0016] A first fluid channel is formed between the first filter element and the lower interface, a second fluid channel is formed between the first filter element and the second filter element, and a third fluid channel is formed between the second filter element and the upper interface. The lower interface, the first fluid channel, the second fluid channel, the third fluid channel, and the upper interface are connected in sequence; a pressure port connected to the second fluid channel is also formed on the shell.

[0017] The upper interface, the lower interface and the pressure tapping port are all integrally formed on the side wall of the cylinder.

[0018] An exhaust port is formed on the upper cover plate, and a sewage outlet is formed on the lower cover plate.

[0019] A first limiting step and a second limiting step are formed on the inner wall of the cavity; the first upper end cover of the first filter element and the first limiting step form a limiting fit; the second upper end cover of the second filter element and the second limiting step form a limiting fit; the upper interface is located above the second limiting step, the lower interface is located below the first limiting step, and the pressure taking port is located between the first limiting step and the second limiting step.

[0020] The lower cover plate is in contact with the first lower end cover of the first filter element, and the upper cover plate is in contact with the second upper end cover of the second filter element.

[0021] The lower interface is an inlet, the upper interface is an outlet, and the filtering accuracy of the first filter element is lower than that of the second filter element.

[0022] A supporting frame is arranged on the outer side wall of the cylinder.

[0023] A filtration system, comprising:

[0024] The above filters;

[0025] A plurality of pressure sensors are respectively connected to the upper interface, the pressure port and the lower interface, and are respectively used to detect the pressure values ​​of the first fluid channel, the second fluid channel and the third fluid channel.

[0026] It also includes a control cabinet, which is connected to the pressure sensor and is used to receive pressure information obtained by the pressure sensor and send an alarm signal after the pressure difference between the upper interface and the pressure port and / or the pressure difference between the pressure port and the lower interface exceeds a threshold.

[0027] When the pressure difference between the pressure taking port and the lower interface exceeds the threshold, the machine is stopped to replace the first filter element; when the pressure difference between the upper interface and the pressure taking port exceeds the threshold, the machine is stopped to replace the second filter element.

[0028] The beneficial effects of the present invention are:

[0029] 1. The first filter element and the second filter element are provided to achieve step-by-step filtration with good filtration effect;

[0030] 2. The first filter element and the second filter element are installed in the same housing, and the second filter element passes through the first through hole and extends into the first filter element, and is coaxially nested. This makes the structure more compact, the filter volume is small, and the occupied area is small;

[0031] 3. The first filter element is installed into the housing from bottom to top, and the second filter element is installed into the housing from top to bottom. The first filter element and the second filter element are separately arranged and can be independently disassembled and assembled without interfering with each other. Not only is the disassembly and assembly operation more convenient, but also only the first filter element or the second filter element can be replaced according to actual conditions, thereby reducing costs;

[0032] 4. Add a pressure port. The pressure difference between the upper interface, the pressure port and the lower interface can be used to accurately determine the faulty filter element, thereby achieving accurate replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the filter (with a support frame) according to an embodiment of the present invention.

[0034] Figure 2 Schematic diagram of the structure of the filter (without the support frame) according to an embodiment of the present invention.

[0035] Figure 3It is a schematic structural diagram of a filter element assembly according to an embodiment of the present invention.

[0036] Figure 4 It is a schematic diagram of the structure of the filtering system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are further described below in conjunction with the accompanying drawings. Example

[0038] like Figure 1-3 As shown, a filter comprises a housing 1 and a filter element assembly arranged inside the housing.

[0039] The shell 1 includes a cylinder 2, an upper cover plate 3, and a lower cover plate 4. The cylinder 2 has a cavity 21 with openings at both ends. The upper cover plate 3 and the lower cover plate 4 are detachably mounted at the upper and lower ends of the cylinder 2. There are many ways to connect the upper cover plate 3, the lower cover plate 4 and the cylinder. In this embodiment, the locking connection is achieved by a clamp. The cylinder 2 and the outer circumference of the upper cover plate 3 and the lower cover plate 4 are all formed with an inclined opening, which is matched with the clamp. The cylinder 2 and the upper cover plate 3 and the lower cover plate 4 can be tightly installed by locking the clamp, and the disassembly and assembly operation is also very convenient. At the same time, a sealing gasket is provided between the upper cover plate 3, the lower cover plate 4 and the cylinder to ensure reliable sealing.

[0040] The filter element assembly includes a first filter element 5 and a second filter element 6 with different filtering accuracies. The first filter element 5 and the second filter element 6 can be folded filter elements or wound filter elements.

[0041] The first filter element 5 comprises a first filter part 51 and a first upper end cap 52 and a first lower end cap 53 respectively disposed at both ends of the first filter part 51. The first filter part 51 comprises a hollow central tube and a filter membrane wrapped outside the central tube. A first through hole 54 communicating with the hollow part of the central tube is formed at the center of the first upper end cap 52, and the first lower end cap 53 is completely closed. The first filter element 5 is inserted into the cavity 21 from the lower end opening of the cylinder 2. A sealing ring is disposed on the outer periphery of the first upper end cap 52 to maintain a sealing fit with the cylinder 2.

[0042] The second filter element 6 includes a second filter part 61 and a second upper end cap 62 and a second lower end cap 63 respectively disposed at both ends of the second filter part 61. Similarly, the second filter part 61 also includes a hollow central tube and a filter membrane wrapped outside the central tube. A second through hole 64 communicating with the hollow part of the central tube is formed at the center of the second upper end cap 62, and the second lower end cap 63 is completely closed. The second filter element 6 is loaded into the cavity 21 from the upper end opening of the cylinder 2, and the lower end of the second filter element 6 passes through the first through hole 54 and extends to the inside of the first filter element 5. The outer periphery of the second upper end cap 62 is also provided with a sealing ring, and is kept in a sealed fit with the cylinder 2.

[0043] Among them, below the first upper end cover 52, the gap between the first filter element 5 and the side wall of the shell forms a first fluid channel 13; below the second upper end cover 62, the gap between the first filter element 5 and the second filter element 6 forms a second fluid channel 14; the interior of the second filter element 6 and the upper space of the second upper end cover 62 form a third fluid channel 15.

[0044] The shell 1 is also provided with an upper interface 11 and a lower interface 12. The upper interface 11 is located at the upper part of the shell 1 and is connected to the third fluid channel 15. The lower interface 12 is located at the lower part of the shell 1 and is connected to the first fluid channel 13. The lower interface 12, the first fluid channel 13, the second fluid channel 14, the third fluid channel 15 and the upper interface 11 are connected in sequence.

[0045] In this embodiment, since the first filter element 5 and the second filter element 6 are installed inside the same housing, and the second filter element 6 passes through the first through hole 54 and extends to the interior of the first filter element 5, a coaxial nested arrangement is achieved, so that the structure is more compact, the overall volume of the filter is small, and the space occupied is also small.

[0046] In this embodiment, the lower interface 12 is an inlet, and the upper interface 11 is an outlet. The filtering accuracy of the first filter element 5 is lower than the filtering accuracy of the second filter element 6. During filtering, the fluid medium enters the first fluid channel 13 from the lower interface 12, enters the second fluid channel 14 after coarse filtering through the first filter part 51 of the first filter element 5, and then enters the third fluid channel 15 after fine filtering through the second filter part 61 of the second filter element 6, and finally flows out of the filter through the upper interface 11. Since the fluid medium is filtered through the first filter 5 and the second filter element 6 in turn, step-by-step filtering can be achieved, and the filtering effect is good.

[0047] After a period of filtering, pollutants will adhere to the filtering surfaces of the first filter element 5 and the second filter element 6 to varying degrees. Excessive pollutants will easily cause blockage, and once blocked, the blocked filter element needs to be replaced. When it is necessary to replace the first filter element 5 or the second filter element 6, just loosen the clamp and remove the upper cover plate 3 or the lower cover plate 4 to quickly replace the first filter element 5 or the second filter element 6. In this embodiment, since the first filter element 5 is installed into the housing 1 from bottom to top and the second filter element 6 is installed into the housing 1 from top to bottom, the first filter element 5 and the second filter element 6 are separately arranged and can be independently disassembled and assembled without interfering with each other. Not only is the disassembly and assembly operation more convenient, but also only the first filter element or the second filter element can be replaced according to actual conditions, without the need to replace all of them, which greatly reduces costs.

[0048] The shell 1 is also provided with a pressure taking port 16 which is connected with the second fluid channel 14. The pressure of the second fluid channel 14 can be conveniently detected through the pressure taking port 16. At the same time, the pressure of the first fluid channel 13 and the third fluid channel 15 can also be realized through the lower interface 12 and the upper interface 11, so that the pressure difference between the first fluid channel 13, the second fluid channel 14 and the third fluid channel 15 can be obtained. That is to say, by adding the pressure taking port 16, the faulty filter element can be accurately judged through the pressure difference at the upper interface 11, the pressure taking port 16 and the lower interface 12, thereby realizing accurate replacement.

[0049] In addition, the upper interface, lower interface, and pressure-taking port can be arranged on the cylinder, or they can be arranged correspondingly on the upper cover plate or the lower cover plate. Of course, in the present embodiment, the upper interface 11, the lower interface 12, and the pressure-taking port 16 are all integrally formed on the side wall of the cylinder 2. Such an arrangement is more conducive to the disassembly and assembly operations of the upper cover plate and the lower cover plate.

[0050] The upper cover plate 3 is also formed with an exhaust port 31, and the lower cover plate 4 is formed with a sewage outlet 41. Both the exhaust port 31 and the sewage outlet 41 are provided with valves. The exhaust port 31 can be used to exhaust gas, and the sewage outlet is used to discharge sewage. When the filter element fails and needs to be replaced and repaired, the exhaust port 31 and the sewage outlet 41 can be opened to discharge the fluid medium inside the cylinder, so as to facilitate the disassembly and replacement of the filter element.

[0051] A first limiting step 22 and a second limiting step 23 are formed on the inner wall of the cavity 21, the first upper end cover 52 of the first filter element 5 is limitedly matched with the first limiting step 22, and the second upper end cover 62 of the second filter element 6 is limitedly matched with the second limiting step 23. The upper interface 11 is located above the second limiting step 23, the lower interface 12 is located below the first limiting step 22, and the pressure taking port 16 is located between the first limiting step 22 and the second limiting step 23. The first limiting step 22 and the second limiting step 23 can realize accurate positioning and installation of the first filter element 5 and the second filter element 6.

[0052] At the same time, the lower cover plate 4 is in contact with the first lower end cover 53 of the first filter element 5, and the upper cover plate 3 is in contact with the second upper end cover 62 of the second filter element 6. The lower cover plate 4 is in contact with the upper cover plate 3, so that the first filter element 5 and the second filter element 6 will not shake, and the structure is more stable and reliable. In order to ensure reliable matching, a spring buffer pad is provided between the first filter element and the lower cover plate to achieve elastic pressing, which ensures reliable pressing and avoids damage to the first filter element caused by excessive extrusion force. The upper end of the second upper end cover of the second filter element extends with an extension portion to facilitate contact with the upper cover plate, and a spring buffer pad can also be provided between the top of the extension portion and the upper cover plate. In addition, the extension portion can also be extended downward from the upper cover plate, or it can be replaced by an additional filter element structure to further add a layer of filtration and improve the filtering performance.

[0053] Of course, in order to facilitate the disassembly and assembly operations, the upper cover plate, the lower cover plate, the first filter element, and the second filter element can all be provided with handle structures to facilitate grabbing and realizing quick disassembly and assembly operations.

[0054] The outer wall of the cylinder 2 is symmetrically provided with support frames 7, which can lift the housing to a higher position, thereby facilitating the disassembly and assembly of the lower cover plate and the first filter element. Furthermore, universal wheels are provided at the bottom of the support frame 7 to facilitate the overall movement of the filter. Example

[0055] like Figure 4 As shown, a filtering system includes the filter 100 described in the first embodiment, three pressure sensors 200 and a control cabinet 300.

[0056] The three pressure sensors 200 are respectively connected to the upper interface 11 , the pressure port 16 , and the lower interface 12 , and are used to detect the pressure values ​​of the first fluid channel 13 , the second fluid channel 14 , and the third fluid channel 15 .

[0057] The control cabinet 300 is connected to the pressure sensor 200, and is used to receive pressure information obtained by the pressure sensor 200, and send an alarm signal after the pressure difference between the upper interface and the pressure port and / or the pressure difference between the pressure port and the lower interface exceeds a threshold.

[0058] The control cabinet adopts a PLC control cabinet with a control panel commonly used in industrial environments. The control panel can conveniently set the corresponding parameters and display the real-time pressure value of each pressure sensor. The alarm signal is sent by an alarm device, such as an alarm light or buzzer connected to the control cabinet. When the pressure difference exceeds the set threshold, the alarm light will emit a warning light or the buzzer will emit an alarm sound to remind the staff.

[0059] When the pressure difference between the upper interface and the pressure port exceeds the threshold, the machine is stopped to replace the second filter element. When the pressure difference between the upper interface and the pressure port is normal, but the pressure difference between the pressure port and the lower interface exceeds the threshold, the machine is stopped to replace the first filter element.

[0060] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] For example, the upper cover plate 3 and the lower cover plate 4 are respectively detachably installed at the upper and lower ends of the cylinder 2, the first filter element is installed from bottom to top, and the second filter element is installed from top to bottom. The various position ranges are described based on the orientation shown in the accompanying drawings. In actual product applications, the filter can also be flipped 180° and inverted, that is, the upper cover plate in the figure can be located at the bottom, and its exhaust port is used as a sewage outlet, and the lower cover plate is located at the top, and its sewage outlet is used as an exhaust port. Correspondingly, the first filter element needs to be installed from top to bottom, and the second filter element is installed from bottom to top.

[0062] Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0064] Technical personnel should note that: Although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent right.

Claims

1. A filter, comprising a housing (1) and a filter element assembly arranged inside the housing, wherein the upper portion of the housing (1) has an upper interface (11), and the lower portion of the housing (1) has a lower interface (12); characterized in that: The housing (1) comprises: A cylinder (2) having a cavity (21) with openings at both upper and lower ends; An upper cover plate (3) which is detachably mounted on the upper end of the cylinder (2); A lower cover plate (4) which is detachably mounted on the lower end of the cylinder (2); The filter element assembly comprises: A first filter element (5), comprising a first filter portion (51) and a first upper end cover (52) and a first lower end cover (53) respectively disposed at two ends of the first filter portion (51), wherein the first upper end cover (52) is formed with a first through hole (54), and the first lower end cover (53) is arranged in a closed manner, wherein the first filter element (5) is inserted into the cavity (21) from the lower end opening of the cylinder (2), and the first upper end cover (52) and the cylinder (2) are kept in a sealed fit; A second filter element (6), comprising a second filter portion (61) and a second upper end cover (62) and a second lower end cover (63) respectively disposed at two ends of the second filter portion (61), the second upper end cover (62) being formed with a second through hole (64), the second lower end cover (63) being arranged in a closed manner, the second filter element (6) being inserted into the cavity (21) from the upper end opening of the cylinder (2), and the lower end of the second filter element (6) passing through the first through hole (54) and extending into the interior of the first filter element (5); A first fluid channel (13) is formed between the first filter element (5) and the lower interface (12), a second fluid channel (14) is formed between the first filter element (5) and the second filter element (6), and a third fluid channel (15) is formed between the second filter element (6) and the upper interface (11); the lower interface (12), the first fluid channel (13), the second fluid channel (14), the third fluid channel (15), and the upper interface (11) are connected in sequence; and a pressure tapping port (16) connected to the second fluid channel (14) is also formed on the housing (1).

2. The filter according to claim 1, characterized in that: The upper interface (11), the lower interface (12), and the pressure tapping port (16) are all integrally formed on the side wall of the cylinder (2).

3. The filter according to claim 1, characterized in that: An exhaust port (31) is formed on the upper cover plate (3), and a sewage outlet (41) is formed on the lower cover plate (4).

4. The filter according to claim 2, characterized in that: A first limiting step (22) and a second limiting step (23) are formed on the inner wall of the cavity (21); the first upper end cover (52) of the first filter element (5) and the first limiting step (22) form a limiting fit; and the second upper end cover (62) of the second filter element (6) and the second limiting step (23) form a limiting fit; The upper interface (11) is located above the second limiting step (23), the lower interface (12) is located below the first limiting step (22), and the pressure taking port (16) is located between the first limiting step (22) and the second limiting step (23).

5. The filter according to claim 4, characterized in that: The lower cover plate (4) abuts against a first lower end cover (53) of the first filter element (5), and the upper cover plate (3) abuts against a second upper end cover (62) of the second filter element (6).

6. The filter according to claim 1, characterized in that: The lower interface (12) is an inlet, the upper interface (11) is an outlet, and the filtering accuracy of the first filter element (5) is lower than the filtering accuracy of the second filter element (6).

7. The filter according to claim 1, characterized in that: A support frame (7) is provided on the outer side wall of the cylinder (2).

8. A filtering system, characterized in that: include: The filter (100) according to any one of claims 1 to 7; A plurality of pressure sensors (200) are respectively connected to the upper interface (11), the pressure port (16), and the lower interface (12), and are respectively used to detect the pressure values ​​of the first fluid channel (13), the second fluid channel (14), and the third fluid channel (15).

9. The filtration system according to claim 8, characterized in that: The device also includes a control cabinet (300), the control cabinet (300) being connected to the pressure sensor (200) and being used to receive pressure information obtained by the pressure sensor (200) and to send an alarm signal when the pressure difference between the upper interface and the pressure tapping port and / or the pressure difference between the pressure tapping port and the lower interface exceeds a threshold value.

10. The filtration system according to claim 8 or 9, characterized in that: When the pressure difference between the pressure taking port and the lower interface exceeds the threshold, the machine is stopped to replace the first filter element; when the pressure difference between the upper interface and the pressure taking port exceeds the threshold, the machine is stopped to replace the second filter element.

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