Backwash filter and hydraulic support

Abstract

The utility model relates to the technical field of hydraulic supports, in particular to a backwashing filter and a hydraulic support. The backwashing filter comprises a valve body and a filter assembly, wherein the valve body is provided with a first liquid inlet, a first liquid outlet and a waste liquid outlet; the filtering assembly is arranged in the valve body; at least two groups of filter assemblies are arranged, and each group of filter assembly comprises a filter element assembly and a valve element assembly which are communicated with each other; a second liquid inlet and a second liquid outlet are formed in the filter element assembly, and the second liquid outlet is communicated with the first liquid outlet; the valve element assembly is used for controlling connection and disconnection between the first liquid inlet and the second liquid inlet and / or controlling connection and disconnection between the second liquid inlet and the waste liquid discharging opening. The backwashing filter provided by the utility model not only can ensure the washing efficiency of the filter element assembly, but also can improve the filtering efficiency of the backwashing filter.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic supports, in particular to an anti-flushing filter and a hydraulic support. Background Technique

[0002] In the hydraulic system of a hydraulic support, an anti-flushing filter is commonly used to filter the high-pressure liquid to enter the main control valve.

[0003] In the prior art, the anti-flushing operation of the filter element assembly in the automatic anti-flushing filter often requires the filtration of the anti-flushing filter to stop, which will affect the progress of the entire filtration operation and the filtration efficiency. Content of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the utility model provides an anti-flushing filter, which can perform the flushing of the filter element assembly to be flushed while enabling the filter element assembly that does not need to be flushed to normally perform the filtration operation to ensure the filtration efficiency of the anti-flushing filter.

[0006] The utility model also provides a hydraulic support including the above anti-flushing filter.

[0007] An anti-flushing filter according to an embodiment of the first aspect of the utility model for a hydraulic support includes:

[0008] A valve body is provided with a first liquid inlet, a first liquid outlet and a waste liquid discharge port, and the first liquid outlet is connected to the main control valve of the hydraulic support;

[0009] A filtering assembly is arranged in the valve body; the filtering assembly has at least two groups, and each group of filtering assemblies includes a filter element assembly and a valve core assembly that are communicated with each other; the filter element assembly is provided with a second liquid inlet and a second liquid outlet, and the second liquid outlet is communicated with the first liquid outlet; the valve core assembly is used to control the on-off between the first liquid inlet and the second liquid inlet, and / or control the on-off between the second liquid inlet and the waste liquid discharge port.

[0010] Optionally, the valve core assembly is a three-way reversing valve core, and the three-way reversing valve core includes:

[0011] A cavity is provided with a first through hole, a second through hole and a third through hole, the first through hole is communicated with the first liquid inlet, the second through hole is communicated with the second liquid inlet, and the third through hole is communicated with the waste liquid discharge port;

[0012] The valve stem is located inside the cavity and can move axially inside the cavity. A sealing structure is provided on the valve stem. The valve stem has a first position and a second position. When the valve stem is in the first position, the sealing structure seals the third through hole so that the first liquid inlet and the second liquid inlet are communicated. When the valve stem is in the second position, the sealing structure seals the first through hole so that the second liquid inlet and the waste liquid outlet are communicated.

[0013] The control assembly is arranged on the valve body and is used to control the valve stem to move to the first position or the second position.

[0014] Optionally, the control assembly includes a control port and a control pipeline arranged on the valve body. One end of the control pipeline is connected to the control port, and the other end of the control pipeline is communicated with the cavity. The control port is used to convey the control liquid into the control pipeline so that the valve stem moves inside the cavity driven by the control liquid conveyed through the control pipeline.

[0015] Optionally, the control port is connected to the functional port of the main control valve.

[0016] Optionally, the control port is a female end joint structure.

[0017] Optionally, the three-way reversing valve core is a threaded plug-in structure.

[0018] Optionally, the first liquid inlet, the first liquid outlet and the waste liquid outlet are all female end joint structures.

[0019] Optionally, a blocking hole is further provided on the valve body. The first liquid inlet is communicated with the valve core assembly through a liquid inlet pipeline, the liquid inlet pipeline is communicated with the blocking hole, and a block is provided on the blocking hole.

[0020] Optionally, it further includes a controller, and the controller is used to control the backwashing filter to switch between the filtering state and the flushing state. The controller includes:

[0021] The first control module is used to control each valve core assembly to keep the first liquid inlet and the second liquid inlet communicated and the second liquid inlet and the waste liquid outlet blocked when the backwashing filter is in the filtering state.

[0022] The second control module is used to control the valve core assembly communicated with the filter element assembly to be flushed to keep the first liquid inlet and the second liquid inlet blocked and the second liquid inlet and the waste liquid outlet communicated when the backwashing filter is in the flushing state, and control other valve core assemblies to keep the first liquid inlet and the second liquid inlet communicated and the second liquid inlet and the waste liquid outlet blocked.

[0023] A hydraulic support according to an embodiment of the second aspect of the present invention includes the backwashing filter of the first aspect and each implementation manner.

[0024] One of the technical solutions in the above technical solutions has at least the following advantages or beneficial effects:

[0025] For a backwashing filter according to an embodiment of the present invention, by providing a first liquid inlet, a first liquid outlet and a waste liquid discharge port on the valve body, and arranging at least two groups of filter components in the valve body, wherein the second liquid outlet of the filter element assembly is communicated with the first liquid outlet; finally, by controlling the on-off between the first liquid inlet and the second liquid inlet and / or controlling the on-off between the second liquid inlet and the waste liquid discharge port by the valve core assembly, that is, when it is necessary to wash the filter element assembly to be washed, by controlling the on-off between the corresponding first liquid inlet, second liquid inlet and waste liquid discharge port of each valve core assembly, the washing of the filter element assembly to be washed can be completed, and at the same time, the filter element assembly that does not need to be washed can be normally filtered. It can be seen that the backwashing filter provided by the present application can not only ensure the washing efficiency of the filter element assembly, but also improve the filtering efficiency of the backwashing filter.

[0026] The hydraulic support provided by the embodiment of the present invention is provided with the above-mentioned backwashing filter. Since the backwashing filter has the above technical effects, the hydraulic support provided with the backwashing filter should also have the corresponding technical effects. Brief Description of the Drawings

[0027] Figure 1 Shows a schematic structural diagram of a backwashing filter according to an embodiment provided by the present invention;

[0028] Figure 2 Shows Figure 1 A side view of the backwashing filter in

[0029] Figure 3 Shows Figure 1 Another side view of the backwashing filter in

[0030] Figure 4 Shows Figure 3 A cross-sectional view in the Q-Q direction;

[0031] Figure 5 Shows Figure 4 A cross-sectional view in the N-N direction;

[0032] Figure 6 Shows a hydraulic schematic diagram of a backwashing filter according to an embodiment provided by the present invention.

[0033]

Description of the Reference Numerals

[0034] 1. Valve body, 101. First liquid inlet, 102. First liquid outlet, 103. Waste liquid discharge port, 104. Control port, 105. Blocking hole, 106. Liquid inlet pipeline, 107. Blocking

[0035] 2. Filter element assembly, 201. Second liquid inlet

[0036] 3. Spool valve assembly, 301. Cavity, 302. Valve rod, 303. Sealing structure Specific embodiments

[0037] For better explaining the present utility model for easy understanding, the present utility model will be described in detail below with reference to the accompanying drawings through specific embodiments.

[0038] In the hydraulic system of a hydraulic support, a barrel filter or a backwash filter is commonly used as a medium filtering element. The backwash filter is deeply welcomed by customers because it does not need to frequently replace the filter element like a barrel filter; it has basically become a standard configuration for customer selection. Among them, common backwash filters include manual backwash filters (by moving the handle) and automatic backwash filters (electro-hydraulic control). Manual backwash is commonly used in manual hydraulic supports, while automatic backwash is only used in electro-hydraulic control hydraulic supports.

[0039] When backwashing the filter element assembly in an automatic backwash filter, it is often necessary to stop the filtering operation of the backwash filter, which will affect the progress of the entire filtering operation and the filtering efficiency.

[0040] In order to solve at least one of the technical problems existing in the prior art or related technologies, the present utility model provides a backwash filter, which includes a valve body and a filtering assembly. The valve body is provided with a first liquid inlet, a first liquid outlet, and a waste liquid discharge port. The first liquid outlet is connected to the main control valve of the hydraulic support; the filtering assembly is arranged in the valve body; the filtering assembly has at least two groups, and each group of the filtering assembly includes a filter element assembly and a spool valve assembly that are connected to each other; the filter element assembly is provided with a second liquid inlet and a second liquid outlet, and the second liquid outlet is communicated with the first liquid outlet; the spool valve assembly is used to control the on-off between the first liquid inlet and the second liquid inlet, and / or control the on-off between the second liquid inlet and the waste liquid discharge port. It can be seen that the backwash filter provided by the present application can not only ensure the flushing efficiency of the filter element assembly, but also improve the filtering efficiency of the backwash filter.

[0041] The following describes the backwash filter and the hydraulic support according to some embodiments provided by the present utility model with reference to the drawings.

[0042] See Figures 1 to 6, An example of a backwashing filter provided by the present utility model is applied to a hydraulic support. The backwashing filter includes a valve body 1 and a filtering component. The valve body 1 is provided with a first liquid inlet 101, a first liquid outlet 102, and a waste liquid discharge port 103. The first liquid outlet 102 is connected to the main control valve of the hydraulic support; the filtering component is arranged inside the valve body 1; there are at least two groups of filtering components, and each group of filtering components includes a filter element assembly 2 and a valve core assembly 3 that are interconnected; the filter element assembly 2 is provided with a second liquid inlet 201 and a second liquid outlet, and the second liquid outlet is communicated with the first liquid outlet 102; the valve core assembly 3 is used to control the on-off between the first liquid inlet 101 and the second liquid inlet 201, and / or control the on-off between the second liquid inlet 201 and the waste liquid discharge port 103.

[0043] Among them, the axial directions of the filter element assembly 2 and the valve core assembly 3 are parallel.

[0044] It should be noted that the first liquid inlet 101 can be connected to a pump station so that the high-pressure liquid in the pump station enters the valve core assembly 3 through the first liquid inlet 101.

[0045] Exemplarily, there are two groups of filtering components. One group of filter element assemblies 2 includes a filter element assembly A and a valve core assembly A that are interconnected, and the other group of filter element assemblies 2 includes a filter element assembly B and a valve core assembly B that are interconnected; when the backwashing filter is in a filtering state, by controlling the valve core assembly A and the valve core assembly B, the first liquid inlet 101 can be kept in communication with the second liquid inlet 201 through the valve core assembly A and the valve core assembly B, and the second liquid inlet 201 of the filter element assembly A can be kept separated from the waste liquid discharge port 103 through the valve core assembly A, and the second liquid inlet 201 of the filter element assembly B can be kept separated from the waste liquid discharge port 103 through the valve core assembly B. Furthermore, the high-pressure liquid in the valve core assembly A enters the filter element assembly A through the second liquid inlet 201 on the filter element assembly A, and the high-pressure liquid in the valve core assembly B enters the filter element assembly B through the second liquid inlet 201 on the filter element assembly B, completing the filtration of the high-pressure liquid in the filter element assembly A and the filter element assembly B. After the high-pressure liquid passes through the above filtration, it flows into the main control valve of the hydraulic support through the second liquid outlets corresponding to the filter element assembly A and the filter element assembly B respectively, and the first liquid outlet 102 in sequence.

[0046] When the backwash filter is in the flushing state and flushing the filter element assembly A, by controlling the spool assembly A, the first liquid inlet 101 is kept separated from the second liquid inlet 201 on the filter element assembly A through the spool assembly A, and the second liquid inlet 201 on the filter element assembly A is kept in communication with the waste liquid outlet 103 through the spool assembly A. At the same time, the spool assembly B is controlled so that the first liquid inlet 101 is kept in communication with the second liquid inlet 201 through the spool assembly B, and the second liquid inlet 201 on the filter element assembly B is kept separated from the waste liquid outlet 103 through the spool assembly B. After the high-pressure liquid enters the spool assembly B through the first liquid inlet 101, the high-pressure liquid enters the filter element assembly B through the second liquid inlet 201 on the filter element assembly B, and after being filtered, it flows to the first liquid outlet 102. At this time, a part of the high-pressure liquid flows to the main control valve through the first liquid outlet 102, and another part flows into the filter element assembly A. After this part of the high-pressure liquid completes the flushing of the filter element assembly A, this part of the high-pressure liquid can sequentially pass through the second liquid inlet 201 on the filter element assembly A and the spool assembly A, and then be discharged through the waste liquid outlet 103 communicated with the spool assembly A, thus completing the reverse flushing of the filter element assembly A to be flushed.

[0047] In this embodiment, by providing a first liquid inlet 101, a first liquid outlet 102, and a waste liquid outlet 103 on the valve body 1, and arranging at least two groups of filter assemblies in the valve body 1, wherein the second liquid outlet of the filter element assembly 2 is communicated with the first liquid outlet 102. Finally, by controlling the on-off between the first liquid inlet 101 and the second liquid inlet 201 and / or the on-off between the second liquid inlet 201 and the waste liquid outlet 103 through the spool assembly 3, that is, when it is necessary to flush the filter element assembly 2 to be flushed, by controlling the on-off between the first liquid inlet 101, the second liquid inlet 201, and the waste liquid outlet 103 corresponding to each spool assembly 3, the flushing of the filter element assembly 2 to be flushed can be completed, and at the same time, the filter element assembly 2 that does not need to be flushed can be made to perform normal filtering operations. Thus, it can be seen that the backwash filter provided by the present application can not only ensure the flushing efficiency of the filter element assembly 2, but also improve the filtering efficiency of the backwash filter.

[0048] In some possible embodiments, the valve core assembly 3 is a three-way reversing valve core. The three-way reversing valve core includes a cavity 301, a valve stem 302 and a control assembly. The cavity 301 is provided with a first through hole, a second through hole and a third through hole. The first through hole is communicated with the first liquid inlet 101, the second through hole is communicated with the second liquid inlet 201, and the third through hole is communicated with the waste liquid discharge port 103. The valve stem 302 is located in the cavity 301 and can axially move in the cavity 301. A blocking structure 303 is provided on the valve stem 302. The valve stem 302 has a first position and a second position. When the valve stem 302 is in the first position, the blocking structure 303 blocks the third through hole to enable the first liquid inlet 101 to communicate with the second liquid inlet 201. When the valve stem 302 is in the second position, the blocking structure 303 blocks the first through hole to enable the second liquid inlet 201 to communicate with the waste liquid discharge port 103. The control assembly is arranged on the valve body 1 and is used to control the valve stem 302 to move to the first position or the second position.

[0049] In this embodiment, when the backwash filter is in the filtering state, by moving the valve stem 302 of the control assemblies of all the three-way reversing valve cores to the first position, the first liquid inlet 101 is kept in communication with the second liquid inlet 201 through all the three-way reversing valve cores, and the second liquid inlets 201 of the respective filter element assemblies 2 are kept separated from the waste liquid discharge port 103, so that the high-pressure liquid entering from the first liquid inlet 101 can enter the respective filter element assemblies 2 corresponding to the respective three-way reversing valve cores after entering the respective three-way reversing valve cores, and the filtering of the high-pressure liquid is completed. When the backwash filter is in the flushing state, by moving the valve stem 302 of the control assembly of the three-way reversing valve core corresponding to the filter assembly to be flushed to the second position, the first liquid inlet 101 is kept separated from the second liquid inlet 201 through the three-way reversing valve core corresponding to the filter assembly to be flushed, and the second liquid inlets 201 of the filter element assemblies 2 to be flushed are kept in communication with the waste liquid discharge port 103, and the control assemblies of the other three-way reversing valve cores are kept controlling the valve stem 302 in the first position, so that after the high-pressure liquid enters the three-way reversing valve core corresponding to the filter assembly that does not need to be flushed through the first liquid inlet 101, it enters the filter assembly that does not need to be flushed to complete the filtering, and then flows to the first liquid outlet 102. At this time, a part of the high-pressure liquid flows to the main control valve through the first liquid outlet 102, and the other part flows to the filter assembly to be flushed. After the part of the high-pressure liquid completes the flushing of the filter assembly to be flushed, the part of the high-pressure liquid can sequentially pass through the second liquid inlet 201 on the filter assembly to be flushed and its corresponding three-way reversing valve core, and finally be discharged through the waste liquid discharge port 103, and the reverse flushing of the filter element assembly 2 to be flushed can be completed.

[0050] Further, the control component includes a control port 104 provided on the valve body 1 and a control pipeline. One end of the control pipeline is connected to the control port 104, and the other end of the control pipeline communicates with the cavity 301; the control port 104 is used to deliver the control liquid into the control pipeline, so that the valve stem 302 moves in the cavity 301 driven by the control liquid delivered through the control pipeline.

[0051] Here, the end of the control pipeline far from the control port 104 communicates with the bottom of the cavity 301, so that the control liquid entering through the control pipeline enters the cavity 301, and the valve stem 302 located in the cavity 301 moves in the cavity 301 under the oil pressure of the control liquid.

[0052] Furthermore, the control port 104 is connected to the functional port of the main control valve.

[0053] It should be noted that the control liquid can flow from the functional port of the main control valve into the control port 104.

[0054] In this embodiment, by connecting the control port 104 to the functional port of the main control valve, it is possible to control the main control valve to make the control liquid flow to the functional port of the main control valve and then into the control port 104, so that the staff can use the control liquid to control the movement of the valve stem 302 between the first position and the second position through the control valve.

[0055] Further, the control port 104 is of a female end joint structure.

[0056] In this embodiment, by selecting the control port 104 as the female end joint structure, the control port 104 can be quickly connected to the hydraulic system on the hydraulic support by using the cooperation between the female end joint structure and the rubber hose, reducing the connection difficulty between the control port 104 and the hydraulic system on the hydraulic support.

[0057] Further, the three-way reversing valve core is of a threaded plug-in structure.

[0058] In this embodiment, by selecting the three-way reversing valve core as the threaded plug-in structure, the quick assembly of the three-way reversing valve core on the valve body 1 can be realized, so as to improve the assembly efficiency of the backwashing filter.

[0059] In some possible embodiments, the first liquid inlet 101, the first liquid outlet 102 and the waste liquid discharge port 103 are all of female end joint structures.

[0060] In this embodiment, by selecting the first liquid inlet 101, the first liquid outlet 102 and the waste liquid discharge port 103 as the female end joint structures, the backwashing filter can be quickly connected to the hydraulic system on the hydraulic support by using the cooperation between the female end joint structure and the rubber hose, reducing the connection difficulty between the backwashing filter and the hydraulic system on the hydraulic support.

[0061] In some possible embodiments, a blocking hole 105 is further provided on the valve body 1. The first liquid inlet 101 is communicated with the valve core assembly 3 through a liquid inlet pipeline 106. The liquid inlet pipeline 106 is communicated with the blocking hole 105, and a block 107 is provided on the blocking hole 105.

[0062] Here, the block 107 is detachably installed on the blocking hole 105.

[0063] In this embodiment, by providing the blocking hole 105 on the valve body 1 and making the liquid inlet pipeline 106 communicating the first liquid inlet 101 and the valve core assembly 3 communicate with the blocking hole 105, when the liquid inlet pipeline 106 is blocked by the block 107, the block 107 can be detached from the blocking hole 105, and then high-pressure liquid can be flowed into the liquid inlet pipeline 106 through the blocking hole 105 by a pump station, so as to realize the flushing of the liquid inlet pipeline 106.

[0064] In some possible embodiments, the backwashing filter further includes a controller, and the controller is used to control the switching of the backwashing filter between a filtering state and a flushing state; the controller includes a first control module and a second control module; when the backwashing filter is in the filtering state, the first control module is used to control each valve core assembly 3 to keep the first liquid inlet 101 and the second liquid inlet 201 in communication, and to keep the second liquid inlet 201 and the waste liquid discharge port 103 partitioned; when the backwashing filter is in the flushing state, the second control module is used to control the valve core assembly 3 communicating with the filter element assembly 2 to be flushed to keep the first liquid inlet 101 and the second liquid inlet 201 partitioned, and to keep the second liquid inlet 201 and the waste liquid discharge port 103 in communication, and to control the other valve core assemblies 3 to keep the first liquid inlet 101 and the second liquid inlet 201 in communication, and to keep the second liquid inlet 201 and the waste liquid discharge port 103 partitioned.

[0065] In this embodiment, by providing the controller, it is convenient for the staff to complete the switching of the backwashing filter between the filtering state and the flushing state by operating the first control module or the second control module on the controller, that is, to complete the filtering operation of the high-pressure liquid or the flushing operation of the filter element assembly 2.

[0066] A hydraulic support according to an embodiment of the present invention includes the backwashing filter in any of the above embodiments.

[0067] Since the hydraulic support of this embodiment includes any of the backwashing filters in the above first aspect, it has the beneficial effects of any of the above embodiments, which will not be elaborated here.

[0068] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0069] In the present utility model, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "connected to", "fixed" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium; it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0070] In the present utility model, unless otherwise clearly defined and limited, when the first feature is "on" or "under" the second feature, it may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, when the first feature is "above", "over" and "on top of" the second feature, it may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. When the first feature is "under", "beneath" and "underneath" the second feature, it may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0071] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "embodiment", "exemplary embodiment", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0072] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A backwash filter for a hydraulic support, characterized in that: include: The valve body is provided with a first liquid inlet, a first liquid outlet and a waste liquid outlet, wherein the first liquid outlet is connected to the main control valve of the hydraulic support; A filter assembly is arranged in the valve body; the filter assembly is at least two groups, and each group of the filter assembly includes a filter element assembly and a valve core assembly that are interconnected; the filter element assembly is provided with a second liquid inlet and a second liquid outlet, and the second liquid outlet is connected to the first liquid outlet; the valve core assembly is used to control the connection and disconnection between the first liquid inlet and the second liquid inlet, and / or control the connection and disconnection between the second liquid inlet and the waste liquid discharge port.

2. The backwash filter according to claim 1, characterized in that: The valve core assembly is a three-way reversing valve core, and the three-way reversing valve core comprises: The cavity is provided with a first through hole, a second through hole and a third through hole, wherein the first through hole is connected to the first liquid inlet, the second through hole is connected to the second liquid inlet, and the third through hole is connected to the waste liquid outlet; a valve stem, located in the cavity and axially movable in the cavity, a blocking structure being provided on the valve stem, and the valve stem having a first position and a second position; when the valve stem is in the first position, the blocking structure blocks the third through hole so that the first liquid inlet and the second liquid inlet are connected; when the valve stem is in the second position, the blocking structure blocks the first through hole so that the second liquid inlet and the waste liquid discharge port are connected; A control assembly is arranged on the valve body and is used to control the valve stem to move to the first position or the second position.

3. The backwash filter according to claim 2, characterized in that: The control assembly includes a control port and a control pipeline provided on the valve body, one end of the control pipeline is connected to the control port, and the other end of the control pipeline is connected to the cavity; the control port is used to transport control liquid to the control pipeline, so that the valve stem moves in the cavity driven by the control liquid transported through the control pipeline.

4. The backwash filter according to claim 3, characterized in that: The control port is connected to the functional port of the main control valve.

5. The backwash filter according to claim 3, characterized in that: The control port is a female end connector structure.

6. The backwash filter according to claim 2, characterized in that: The three-way reversing valve core is a threaded plug-in structure.

7. The backwash filter according to claim 1, characterized in that: The first liquid inlet, the first liquid outlet and the waste liquid outlet are all female end connector structures.

8. The backwash filter according to claim 1, characterized in that: The valve body is also provided with a plugging hole, the first liquid inlet is connected with the valve core assembly through a liquid inlet pipeline, the liquid inlet pipeline is connected with the plugging hole, and the plugging hole is provided with a plug.

9. The backwash filter according to claim 1, characterized in that: It also includes a controller, which is used to control the backwash filter to switch between a filtering state and a flushing state; the controller includes: a first control module, when the backwash filter is in a filtering state, for controlling each of the valve core assemblies to keep the first liquid inlet and the second liquid inlet connected, and to keep the second liquid inlet and the waste liquid outlet isolated; The second control module is used to control the valve core assembly connected to the filter element assembly to be flushed to keep the first liquid inlet and the second liquid inlet separated, and to keep the second liquid inlet and the waste liquid discharge port connected, when the backwash filter is in a flushing state, and to control the other valve core assemblies to keep the first liquid inlet and the second liquid inlet connected, and to keep the second liquid inlet and the waste liquid discharge port separated.

10. A hydraulic support, characterized in that: Comprising the backwash filter according to any one of claims 1 to 9.

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