Multifunctional filter

Abstract

The multifunctional filter comprises an inlet pipeline, an outlet pipeline and a filter main body, the filter main body is internally divided into a filter outer cavity and a filter inner cavity, the filter outer cavity is communicated with the inlet pipeline, and the filter inner cavity comprises a gas-liquid separation area and a liquid impurity filtering area. The gas-liquid separation area and the liquid impurity filtering area are communicated with the filter outer cavity through a filter screen; and the outlet pipeline is communicated and switched with the gas-liquid separation area and the liquid impurity filtering area through the switching valve assembly. According to the utility model, the switching valve assembly is in switching connection with the gas-liquid separation area and the liquid impurity filtering area, so that the function switching of filtering liquid and gas is realized; during cleaning operation, the liquid impurity filtering area is connected for use, and impurities in liquid are removed; during general operation, the gas-liquid separation area is connected for use, and impurities in gas are removed. During air-drying operation, the gas-liquid separation area is connected for use, and the filter screen between the gas-liquid separation area and the outer cavity of the filter is set as a gas-liquid separation screen, so that liquid molecules in a loop are quickly removed.

Description

Technical Field

[0001] This utility model relates to the field of filtration device technology, and in particular to a multifunctional filter. Background Technology

[0002] A filter is a device widely used in various fields. Its main function is to remove impurities from liquids or gases through physical or chemical methods to achieve purification. It is widely used in the field of equipment cleaning.

[0003] With the development of modern industry, equipment cleaning systems, in addition to cleaning, require additional steps such as drying to remove residual liquids from the equipment for convenient subsequent maintenance. Traditional filters with only a single filtration function are no longer sufficient to meet these needs. For example, during vacuum pump cleaning and maintenance, the filter in the circulation pipeline removes impurities from the cleaning fluid during vacuum pump cleaning; however, during vacuum pump drying, liquid easily accumulates in the filter, which then re-enters the vacuum pump, significantly increasing drying time and consequently increasing the time and energy consumption for vacuum pump cleaning and maintenance.

[0004] Therefore, given the shortcomings of existing technologies, it is necessary to design a multifunctional filter to solve the above problems.

[0005] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solution of this utility model and facilitating the understanding of those skilled in the art. It should not be assumed that the above content is known to those skilled in the art simply because it has been described in the background section of this utility model. Utility Model Content

[0006] To overcome the shortcomings of the prior art, the present invention discloses a multifunctional filter to solve the problem that liquid accumulated in the filter can easily re-enter the equipment during the cleaning and maintenance process, resulting in difficulty in improving the cleaning and maintenance efficiency and excessive energy consumption.

[0007] This utility model discloses a multifunctional filter, including an inlet pipe, an outlet pipe, and a filter body. The inlet pipe serves as the inlet of the multifunctional filter, used to transport circulating liquid or circulating gas into the filter. The outlet pipe serves as the outlet of the multifunctional filter, used to transport the circulating liquid or circulating gas that has passed through the filter to an external pipe. The filter body is divided into an outer filter cavity and an inner filter cavity. The outer filter cavity is connected to the inlet pipe, and the inner filter cavity includes a gas-liquid separation zone and a liquid impurity filtration zone arranged sequentially from top to bottom. The gas-liquid separation zone and the liquid impurity filtration zone are connected to the outer filter cavity through a filter screen. The outlet pipe is connected to the filter body through a switching valve assembly. The switching valve assembly has a first connection port and a second connection port that can be switched to connect with the outlet pipe. The first connection port is connected to the gas-liquid separation zone, and the second connection port is connected to the liquid impurity filtration zone.

[0008] Preferred technical solution: The switching valve assembly includes a main connecting pipe and a switching pipe, with a first connection port and a second connection port disposed on the main connecting pipe; the main connecting pipe is connected to the outlet pipe, and the outer wall of the switching pipe is slidably connected to the inner wall of the main connecting pipe in a vertical direction; the switching pipe can block the first connection port, that is, when the switching pipe slides above or below the first connection port, the first and second connection ports are connected to the outlet pipe, allowing the gas-liquid separation zone to enter the working state, while the liquid remains at the bottom of the filter due to gravity, so that the liquid impurity filtration zone is connected but still in a non-working state; when the switching pipe blocks the first connection port, the second connection port is connected to the outlet pipe, and the first connection port is disconnected from the outlet pipe, allowing the liquid impurity filtration zone to enter the working state.

[0009] Preferred technical solution: The switching valve assembly includes a main connecting pipe and a switching pipe, with a first connection port and a second connection port disposed on the main connecting pipe; the switching pipe is connected to the outlet pipe, and the outer wall of the switching pipe is slidably connected to the inner wall of the main connecting pipe, with a first diversion port and a second diversion port on the switching pipe; when the first diversion port is connected to the first connection port, the second diversion port is disconnected from the second connection port, i.e., the gas-liquid separation zone is in use, and the liquid impurity filtration zone is not in use; when the second diversion port is connected to the second connection port, the first diversion port is disconnected from the first connection port, i.e., the liquid impurity filtration zone is in use, and the gas-liquid separation zone is not in use. The first diversion port and the first connection port, as well as the second diversion port and the second connection port, can be kept disconnected simultaneously, so that the multifunctional filter can completely block the inlet and outlet pipes, thereby replacing the shut-off valve on the cleaning system and reducing the number of components on the circulation pipeline.

[0010] Preferred technical solution: The filter screen between the gas-liquid separation zone and the outer cavity of the filter is a gas-liquid separation screen, which can remove moisture from the gas flowing into the gas-liquid separation zone.

[0011] Preferred technical solution: The gas-liquid separation zone and the liquid impurity filtration zone are separated by a partition.

[0012] Preferred technical solution: The switching valve assembly also includes a drive device, which is mounted on the filter body and the output end of the drive device is connected to the switching pipe.

[0013] Preferred technical solution: The driving device is one of a pneumatic cylinder, a hydraulic cylinder, and an electric cylinder. The driving device can drive the switching tube to move relative to the connecting main tube along its axial direction. The distance between the first connecting port and the second connecting port in the axial direction of the connecting main tube is not the same as the distance between the first diversion port and the second diversion port in the axial direction of the switching tube. The angle between the first connecting port and the second connecting port in the circumferential direction of the connecting main tube is the same as the angle between the first diversion port and the second diversion port in the circumferential direction of the switching tube.

[0014] Preferred technical solution: The driving device is a servo motor, which can drive the switching tube to move relative to the connecting main tube along its circumference. The distance between the first connecting port and the second connecting port in the axial direction of the connecting main tube is the same as the distance between the first diversion port and the second diversion port in the axial direction of the switching tube. The angle between the first connecting port and the second connecting port in the circumference of the connecting main tube is different from the angle between the first diversion port and the second diversion port in the circumference of the switching tube.

[0015] A preferred technical solution is that the number of the first connection port and the second connection port is two or more, and the number is the same as the number of the first diversion port and the second diversion port, in order to increase the gas and liquid conveying capacity.

[0016] Preferred technical solution: The output end of the drive device is provided with a connecting piece, the outer periphery of the connecting piece is connected to the inner wall of the switching tube, and the connecting piece is provided with several through holes to improve the connection stability.

[0017] Preferred technical solution: The outer cavity of the filter is set on the outer periphery of the inner cavity of the filter, and the switching valve assembly is set inside the inner cavity of the filter, increasing the communication area between the outer cavity and the inner cavity of the filter, thereby increasing the flow capacity of liquid and gas in the multifunctional filter. A drain valve is provided at the bottom of the outer cavity of the filter to discharge the liquid and impurities accumulated in the outer cavity of the filter.

[0018] Due to the application of the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows:

[0019] (1) The outer cavity of the multifunctional filter is connected to the gas-liquid separation zone and the liquid impurity filtration zone through a filter screen. It filters and removes impurities from the flowing gas and liquid. The switching valve assembly is connected to the gas-liquid separation zone and the liquid impurity filtration zone to switch between filtering liquid and filtering gas. During cleaning operations, the liquid impurity filtration zone is used to remove impurities from the liquid; during general operations, the gas-liquid separation zone is used to remove impurities from the gas.

[0020] (2) The filter screen between the gas-liquid separation zone and the outer cavity of the filter can be set as a gas-liquid separation screen to separate the gas flowing to the gas-liquid separation zone, so that the gas-liquid separation zone delivers dry gas to the outlet pipeline; during the air drying operation, the gas-liquid separation zone is connected for use, and the liquid molecules in the circuit are quickly removed through the gas-liquid separation screen, thereby improving the operating efficiency of the cleaning system and reducing the energy consumption of the air drying operation.

[0021] (3) The function of the multi-functional filter is automatically switched by using a drive device to control the switching valve assembly, thereby further improving the operating efficiency of the cleaning system.

[0022] (4) At the same time, the inlet and outlet pipelines can be completely blocked by switching valve assembly, thereby replacing the blocking valve on the cleaning system and further reducing the number of devices on the circulation pipeline. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a multifunctional filter according to the present invention;

[0025] Figure 2 This is a longitudinal sectional view of the multifunctional filter in Example 2;

[0026] Figure 3 This is a longitudinal sectional view of the multifunctional filter in Embodiment 1;

[0027] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle;

[0028] Figure 5 for Figure 3 A magnified view of a portion of point C in the middle;

[0029] Figure 6This is a schematic diagram of the connecting piece in this utility model;

[0030] Figure 7 This is a longitudinal sectional view of the multifunctional filter in Example 3.

[0031] In the above attached diagrams: 1. Inlet pipe; 2. Outlet pipe; 3. Filter body; 31. Filter outer cavity; 31a. Drain valve; 32. Filter inner cavity; 32a. Gas-liquid separation zone; 32b. Liquid impurity filtration zone; 32c. Filter screen; 32d. Partition plate; 4. Switching valve assembly; 41. Connecting main pipe; 41a. First connection port; 41b. Second connection port; 42. Switching pipe; 42a. First diversion port; 42b. Second diversion port; 43. Drive device; 431. Connecting piece; 431a. Through hole. Detailed Implementation

[0032] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and their synonyms, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0035] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0036] Furthermore, the terms "installation," "setting," "equipped with," "connection," "linking," "fitting," and "fitting" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Similarly, "fitting" can mean completely or partially fitted. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Example 1:

[0039] like Figure 1 As shown, this utility model discloses a multifunctional filter, including an inlet pipe 1, an outlet pipe 2, a filter body 3, and a switching valve assembly 4. The main components of this utility model will be described in detail below:

[0040] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the filter body 3 is divided into an outer filter cavity 31 and an inner filter cavity 32. The outer filter cavity 31 is located on the outer periphery of the inner filter cavity 32 and is connected to the inlet pipe 1. The inner filter cavity 32 includes a gas-liquid separation zone 32a and a liquid impurity filtration zone 32b arranged sequentially from top to bottom, with the gas-liquid separation zone 32a located above the liquid impurity filtration zone 32b. The gas-liquid separation zone 32a and the liquid impurity filtration zone 32b are connected to the outer filter cavity 31 through a filter screen 32c. It should be noted that in this embodiment, the outer filter cavity 31 is located on the outer periphery of the inner filter cavity 32. In other embodiments, the outer filter cavity 31 may also be located on one side of the inner filter cavity 32. In addition, in this embodiment, the gas-liquid separation zone 32a and the liquid impurity filtration zone 32b are arranged sequentially from top to bottom. However, in other embodiments, the gas-liquid separation zone 32a and the liquid impurity filtration zone 32b may also be horizontally separated. The example in this embodiment is only a preferred scheme with high gas-liquid separation efficiency.

[0041] like Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the switching valve assembly 4 is disposed inside the filter cavity 32 and is used to switch the connection between the gas-liquid separation zone 32a and the liquid impurity filtration zone 32b and the outlet pipe 2. The switching valve assembly 4 includes a connecting main pipe 41 and a switching pipe 42. The connecting main pipe 41 is provided with a first connection port 41a and a second connection port 41b. The first connection port 41a is connected to the gas-liquid separation zone 32a, and the second connection port 41b is connected to the liquid impurity filtration zone 32b. The switching pipe 42 is connected to the outlet pipe 2, and the outer wall of the switching pipe 42 is slidably connected to the inner wall of the connecting main pipe 41. The switching pipe 42 is provided with a first diversion port 42a and a second diversion port 42b. The first diversion port 42a... When connected to the first connection port 41a, the second diversion port 42b is disconnected from the second connection port 41b, that is, the gas-liquid separation zone 32a is connected, while the liquid impurity filtration zone 32b is disconnected; when the second diversion port 42b is connected to the second connection port 41b, the first diversion port 42a is disconnected from the first connection port 41a, that is, the liquid impurity filtration zone 32b is connected, while the gas-liquid separation zone 32a is disconnected; when the first diversion port 42a and the first connection port 41a and the second diversion port 42b and the second connection port 41b can be kept disconnected at the same time, in this state, the inlet pipe 1 and the outlet pipe 2 are completely blocked, so that the multi-functional filter acts as a shut-off valve.

[0042] refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the usage method and principle of this utility model are as follows: When cleaning the equipment, the sliding of the switching pipe 42 and the connecting main pipe 41 is manually controlled to align and connect the second diversion port 42b with the second connection port 41b, while the first diversion port 42a is displaced from the first connection port 41a. The liquid to be descaled flows in from the inlet pipe 1, passing sequentially through the filter outer cavity 31, the filter screen 32c, the liquid impurity filtration zone 32b, the second connection port 41b, and the second diversion port 42b, finally flowing out from the outlet pipe 2. During this process, when the liquid flows through the filter screen 32c, the impurities are filtered out and remain in the filter outer cavity 31. 1. When the equipment filters gas, the sliding of the switching pipe 42 and the connecting main pipe 41 is manually controlled. The first diversion port 42a is aligned and connected with the first connecting port 41a, while the second diversion port 42b is disconnected from the second connecting port 41b. The airflow flows in from the inlet pipe 1, passes through the filter outer cavity 31, the filter screen 32c, the gas-liquid separation zone 32a, the first connecting port 41a, and the first diversion port 42a, and finally flows out from the outlet pipe 2. During this process, when the airflow passes through the filter screen 32c, the impurities are separated and remain in the filter outer cavity 31, thus removing impurities from the gas passing through the multi-functional filter. It should be noted that in this embodiment, the sliding of the switching pipe 42 and the connecting main pipe 41 is manually controlled, but in other embodiments, the sliding of the switching pipe 42 and the connecting main pipe 41 can also be controlled by a driving device.

[0043] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, in order to further improve the operating efficiency of the multi-functional filter, the switching valve assembly 4 also includes a drive device 43. The drive device 43 is located at the upper end of the filter body 3, and the output end of the drive device 43 is connected to the switching pipe 42 for transmission. The drive device 43 replaces manual operation to automatically switch the functions of the multi-functional filter, thereby improving the switching efficiency.

[0044] The drive device 43 can be one of a pneumatic cylinder, a hydraulic cylinder, and an electric cylinder. The drive device 43 can drive the switching pipe 42 to move relative to the connecting main pipe 41 along its axial direction. The distance between the first connecting port 41a and the second connecting port 41b in the axial direction of the connecting main pipe 41 is not the same as the distance between the first diversion port 42a and the second diversion port 42b in the axial direction of the switching pipe 42. When the first connecting port 41a and the first diversion port 42a are aligned and connected, the second connecting port 41b and the second diversion port 42b will be misaligned and disconnected due to the different axial distances. The angle between the first connection port 41a and the second connection port 41b on the circumferential direction of the main connecting pipe 41 is the same as the angle between the first branch port 42a and the second branch port 42b on the circumferential direction of the switching pipe 42. This ensures that when the first connection port 41a is axially aligned with the first branch port 42a, the second connection port 41b is also axially aligned with the second branch port 42b. Consequently, the switching pipe 42 can achieve the connection switching between the first connection port 41a and the first branch port 42a, as well as the second connection port 41b and the second branch port 42b, simply by moving the pipe up and down.

[0045] The drive device 43 can also be a servo motor. The drive device 43 can drive the switching tube 42 to move relative to the connecting main tube 41 along its circumference. The angle between the first connection port 41a and the second connection port 41b in the circumferential direction of the connecting main tube 41 is not the same as the angle between the first diversion port 42a and the second diversion port 42b in the circumferential direction of the switching tube 42. When the first connection port 41a and the first diversion port 42a are aligned and connected, the second connection port 41b and the second diversion port 42b will be misaligned and disconnected due to the different circumferential angles. The distance between the first connection port 41a and the second connection port 41b in the axial direction of the main connection pipe 41 is the same as the distance between the first diversion port 42a and the second diversion port 42b in the axial direction of the switching pipe 42. This ensures that when the first connection port 41a is aligned with the first diversion port 42a in the circumferential direction, the second connection port 41b is also aligned with the second diversion port 42b in the circumferential direction. As a result, the switching pipe 42 can achieve the connection switching between the first connection port 41a and the first diversion port 42a, as well as the second connection port 41b and the second diversion port 42b, simply by rotating horizontally.

[0046] like Figure 3 , Figure 4 and Figure 5 As shown, in order to increase the flow capacity of the multi-functional filter, the number of first connection ports 41a and second connection ports 41b is two or more, and the number is the same as the number of first diversion ports 42a and second diversion ports 42b.

[0047] like Figure 3 and Figure 6 As shown, in order to improve the stability of the connection between the drive device 43 and the switching tube 42, the output end of the drive device 43 is provided with a connecting piece 431. The outer periphery of the connecting piece 431 is connected to the inner wall of the switching tube 42, and the connecting piece 431 is provided with several through holes 431a.

[0048] like Figure 3 As shown, in order to facilitate cleaning of the filter outer cavity 31, a drain valve 31a is provided at the bottom of the filter outer cavity 31. The impurities and sewage accumulated in the filter outer cavity 31 can be quickly discharged through the drain valve 31a.

[0049] Example 2:

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that the gas-liquid separation zone 32a and the liquid impurity filtration zone 32b are separated by a partition 32d. The filter screen 32c between the gas-liquid separation zone 32a and the filter outer cavity 31 is set as a gas-liquid separation screen. When the first diversion port 42a is aligned and connected with the first connection port 41a, the second diversion port 42b is misaligned and disconnected from the second connection port 41b. The airflow flows in from the inlet pipe 1 and passes through the filter outer cavity 31, the gas-liquid separation screen, the gas-liquid separation zone 32a, the first connection port 41a, and the first diversion port 42a in sequence, and finally flows out from the outlet pipe 2. During this process, when the airflow passes through the gas-liquid separation screen, the liquid in it is separated and left in the filter outer cavity 31, so that the liquid in the gas passing through the multi-functional filter is removed, achieving the effect of air drying and reducing the air drying operation time and energy consumption.

[0051] Example 3:

[0052] like Figure 1 , Figure 2 and Figure 7 As shown, the difference between this embodiment and embodiment two is that the connecting main pipe 41 is connected to the outlet pipe 2, and the outer wall of the switching pipe 42 is slidably connected to the inner wall of the connecting main pipe 41 in the vertical direction. The first connection port 41a is blocked and opened by the up and down sliding of the switching pipe 42. When it is necessary to connect the gas-liquid separation zone 32a, the switching pipe 42 is controlled to be staggered from the first connection port 41a. At this time, the first connection port 41a and the second connection port 41b are connected to the outlet pipe 2, so that the gas-liquid separation zone 32a enters the use state. The liquid remains at the bottom of the filter due to gravity, so that the liquid impurity filtration zone 32b is connected but still in the non-use state. When the switching pipe 42 blocks the first connection port 41a, the second connection port 41b is connected to the outlet pipe 2, and the first connection port 41a is disconnected from the outlet pipe 2, so that the liquid impurity filtration zone 32b enters the use state. It should be noted that in other embodiments, when the switching tube 42 is misaligned with the first connection port 41a, the switching tube 42 can also block the second connection port 41b.

[0053] like Figure 1, Figure 2 , Figure 6 and Figure 7 As shown, further, the through hole 431a may not be provided on the connecting piece 431, so that the upper and lower ends of the switching tube 42 are not connected. When the upper end of the switching tube 42 is below the first connecting port 41a, the first connecting port 41a is connected to the outlet pipe 2, while the channel between the second connecting port 41 and the outlet pipe 2 is blocked by the connecting piece 431.

[0054] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multifunctional filter, comprising an inlet pipe (1), an outlet pipe (2), and a filter body (3), characterized in that: The filter body (3) is divided into an outer filter cavity (31) and an inner filter cavity (32). The outer filter cavity (31) is connected to the inlet pipe (1). The inner filter cavity (32) includes a gas-liquid separation zone (32a) and a liquid impurity filtration zone (32b) arranged sequentially from top to bottom. The gas-liquid separation zone (32a) and the liquid impurity filtration zone (32b) are connected to the outer filter cavity (31) through a filter screen (32c). The outlet pipe (2) is connected to the filter body (3) through a switching valve assembly (4). The switching valve assembly (4) is provided with a first connection port (41a) and a second connection port (41b) that can be switched to connect with the outlet pipe (2). The first connection port (41a) is connected to the gas-liquid separation zone (32a), and the second connection port (41b) is connected to the liquid impurity filtration zone (32b).

2. The multifunctional filter according to claim 1, characterized in that: The switching valve assembly (4) includes a main connecting pipe (41) and a switching pipe (42). The first connection port (41a) and the second connection port (41b) are disposed on the main connecting pipe (41). The main connecting pipe (41) is connected to the outlet pipe (2). The outer wall of the switching pipe (42) and the inner wall of the main connecting pipe (41) can be slidably connected in the vertical direction. The switching pipe (42) can block the first connection port (41a).

3. A multifunctional filter according to claim 1, characterized in that: The switching valve assembly (4) includes a main connecting pipe (41) and a switching pipe (42). The first connecting port (41a) and the second connecting port (41b) are disposed on the main connecting pipe (41). The switching pipe (42) is connected to the outlet pipe (2). The outer wall of the switching pipe (42) is slidably connected to the inner wall of the main connecting pipe (41). The switching pipe (42) is provided with a first diversion port (42a) and a second diversion port (42b). When the first diversion port (42a) is connected to the first connecting port (41a), the second diversion port (42b) is disconnected from the second connecting port (41b). When the second diversion port (42b) is connected to the second connecting port (41b), the first diversion port (42a) is disconnected from the first connecting port (41a). The first diversion port (42a) and the first connecting port (41a) and the second diversion port (42b) and the second connecting port (41b) can be kept disconnected at the same time.

4. A multifunctional filter according to claim 1, characterized in that: The filter screen (32c) between the gas-liquid separation zone (32a) and the outer cavity of the filter (31) is a gas-liquid separation screen.

5. A multifunctional filter according to claim 1, characterized in that: The gas-liquid separation zone (32a) and the liquid impurity filtration zone (32b) are separated by a partition (32d).

6. A multifunctional filter according to claim 3, characterized in that: The switching valve assembly (4) also includes a drive device (43), which is disposed on the filter body (3), and the output end of the drive device (43) is connected to the switching tube (42) for transmission.

7. A multifunctional filter according to claim 6, characterized in that: The driving device (43) is one of a cylinder, a hydraulic cylinder, and an electric cylinder. The driving device (43) can drive the switching pipe (42) to move relative to the connecting main pipe (41) along its axial direction. The distance between the first connecting port (41a) and the second connecting port (41b) in the axial direction of the connecting main pipe (41) is not the same as the distance between the first diversion port (42a) and the second diversion port (42b) in the axial direction of the switching pipe (42). The angle between the first connecting port (41a) and the second connecting port (41b) in the circumferential direction of the connecting main pipe (41) is the same as the angle between the first diversion port (42a) and the second diversion port (42b) in the circumferential direction of the switching pipe (42).

8. A multifunctional filter according to claim 6, characterized in that: The driving device (43) is a servo motor. The driving device (43) can drive the switching tube (42) to move relative to the connecting main tube (41) along its circumference. The distance between the first connecting port (41a) and the second connecting port (41b) in the axial direction of the connecting main tube (41) is the same as the distance between the first diversion port (42a) and the second diversion port (42b) in the axial direction of the switching tube (42). The angle between the first connecting port (41a) and the second connecting port (41b) in the circumference of the connecting main tube (41) is different from the angle between the first diversion port (42a) and the second diversion port (42b) in the circumference of the switching tube (42).

9. A multifunctional filter according to claim 6, characterized in that: The output end of the drive device (43) is provided with a connecting piece (431), the outer periphery of the connecting piece (431) is connected to the inner wall of the switching tube (42), and the connecting piece (431) is provided with several through holes (431a).

10. A multifunctional filter according to claim 1, characterized in that: The filter outer cavity (31) is located on the outer periphery of the filter inner cavity (32), and the switching valve assembly (4) is located inside the filter inner cavity (32); a drain valve (31a) is provided at the bottom of the filter outer cavity (31).

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