Backwash filtering device

Abstract

The invention relates to a backwash filter device, which comprises a valve body, a filter element, a filter element and a filter element, and is characterized in that the valve body is provided with a liquid inlet, a liquid outlet and a drain outlet; each backwashing valve core module is provided with a working cavity, a valve core liquid inlet hole and a valve core pollution discharge hole; the backwashing filter element module comprises a liquid outlet cavity, a liquid taking hole, at least two filter cavities and at least two filter screens; the pilot electromagnetic valve module comprises at least two pilot electromagnetic valves, and each pilot electromagnetic valve can control the corresponding backwashing valve element module to be switched between the opening position and the closing position; the liquid taking hole can be communicated with a liquid inlet cavity in each pilot electromagnetic valve; and the control module is detachably connected with the valve body and can control the action of each pilot electromagnetic valve. The backwashing filtering device is more convenient to install and maintain, can meet the filtering and cleaning functions before high-pressure emulsion flows to a hydraulic support system, can also achieve intelligent control, is simple in control loop and can prolong the service life.

Description

Technical Field

[0001] The invention relates to the field of filtering devices, in particular to a backwashing filtering device. Background Art

[0002] Hydraulic support is one of the important coal mine comprehensive mining equipment, and the cleanliness of emulsion is a very important factor to ensure the normal operation of hydraulic support. Emulsion contamination directly affects the normal operation of the hydraulic system, accelerates the wear of components, damages seals, causes valves and other hydraulic components to get stuck and damaged, etc., directly affecting the service life of hydraulic components or causing equipment failure. A backwash filter is generally designed in the hydraulic system of the support to filter and clean the emulsion to ensure the normal operation of the hydraulic support. Existing coal mine underground filters are of various types, but they have complex structures, poor maintainability, high failure rates, short service life, frequent maintenance and other problems, which seriously affect the filtration efficiency of the emulsion and reduce the working efficiency of comprehensive mining equipment.

[0003] In the prior art, there is a manually controlled backwash filter, in which a liquid inlet, a liquid outlet and a sewage outlet are provided on the valve body. The emulsion flows into the liquid inlet on the valve body, flows to the liquid outlet after being filtered by the filter element, and supplies liquid to the hydraulic support control system. The pilot solenoid valve is connected to the valve body through a liquid distribution plate to realize liquid supply and liquid return. The pilot liquid controls the opening and closing of the backwash valve core, and the backwash liquid flows out from the sewage outlet to realize the reverse flushing of the filter element. In this technology, the liquid supply and liquid return of the pilot solenoid valve are realized through the liquid distribution plate, which increases the processing difficulty. In addition, the liquid distribution plate is designed between the backwash valve core and the pilot solenoid valve. To replace and maintain the backwash valve core, the pilot solenoid valve and the liquid distribution plate must be removed first. The structure is complex, the installation and maintenance are inconvenient, the failure rate is high, and the sewage outlet is not easy to close. In addition, this technology can only realize manual control to complete the filter backwashing, and cannot realize intelligent control. Summary of the invention

[0004] The purpose of the present invention is to provide a backwashing filter device, which is more convenient to install and maintain, can meet the filtering and cleaning function of high-pressure emulsion before flowing to the hydraulic support system, can also realize intelligent control, and has a simple control circuit and can increase the service life.

[0005] The object of the present invention is achieved in that a backwashing filter device comprises:

[0006] A valve body having a liquid inlet, a liquid outlet and a sewage outlet;

[0007] At least two backwash valve core modules, each backwash valve core module has a working chamber, a valve core liquid inlet hole and a valve core sewage discharge hole, the valve core liquid inlet hole can be connected to the liquid inlet port, and the valve core sewage discharge hole can be connected to the sewage discharge port; when the backwash valve core module is in a closed position, the working chamber can be connected to the valve core liquid inlet hole, and when it is in an open position, the working chamber can be connected to the valve core sewage discharge hole;

[0008] The backwash filter cartridge module comprises a liquid outlet cavity, a liquid intake hole, at least two filter cavities and at least two filter screens, the liquid outlet cavity can be connected with each filter screen, the liquid intake hole and the liquid outlet, and each filter cavity can be connected with the corresponding filter screen and the corresponding working cavity in the backwash valve cartridge module;

[0009] The pilot solenoid valve module includes at least two pilot solenoid valves, each of which can control the corresponding backwash valve core module to switch between an open position and a closed position; the liquid extraction hole can be connected to the liquid inlet cavity in each pilot solenoid valve;

[0010] And a control module, the control module is detachably connected to the valve body and can control the action of each pilot solenoid valve.

[0011] In a preferred embodiment of the present invention, each pilot solenoid valve also has a manual operation button; the control module has a pressure difference control mode and a time control mode. When the control module is in the pressure difference control mode, it can control the action of each pilot solenoid valve according to the front and rear inlet and outlet hydraulic pressure difference of the backwash filter element module and the pressure difference preset value; when the control module is in the time control mode, it can control the action of each pilot solenoid valve according to the preset time parameters, and the preset time parameters include the backwash start time, the backwash warning time, the backwash interval time and the backwash flushing time.

[0012] In a preferred embodiment of the present invention, the control module can be electrically connected to the main controller of the hydraulic support so as to set the preset pressure difference value and the preset time parameters using the control interface of the main controller.

[0013] In a preferred embodiment of the present invention, the control module also has a manual control mode, and the control interface has a backwash button for operating to generate manual control instructions. When the control module is in manual control mode, the control module can control the action of each pilot solenoid valve according to the manual control instructions.

[0014] In a preferred embodiment of the present invention, the valve body is also provided with two pressure detection ports, and the control module includes a sensor device and a control circuit board. The sensor device is connected to the two pressure detection ports to respectively detect the liquid inlet pressure and liquid outlet pressure of the backwash filter module; the control circuit board is electrically connected to the sensor device and can control the action of each pilot solenoid valve according to the data difference detected by the sensor device.

[0015] In a preferred embodiment of the present invention, the backwash filter assembly further comprises a plugging plate module. When the control module and the valve body are in a disassembled state, the plugging plate module can be detachably mounted on the valve body and can block the two pressure detection ports.

[0016] In a preferred embodiment of the present invention, the backwash filtration device also includes a pilot filter module, the pilot filter module includes a pilot filter screen and a pilot liquid inlet chamber and a pilot liquid outlet chamber that can be connected to the pilot filter screen, the pilot liquid inlet chamber can be connected to the liquid extraction hole, and the pilot liquid outlet chamber can be connected to the liquid inlet chamber in each pilot solenoid valve.

[0017] In a preferred embodiment of the present invention, a pilot filter valve cavity connected to the end face of the valve body is opened in the valve body, and the pilot filter module also includes a filter end cover and a limit ring, and the filter end cover can be removably installed in the pilot filter valve cavity; the pilot filter clamp is installed between the filter end cover and the limit ring, and the pilot filter and the inner wall of the pilot filter valve cavity are enclosed to form a pilot liquid inlet cavity, and the inner cavity of the pilot filter forms a pilot liquid outlet cavity, and the pilot liquid outlet cavity is connected with the liquid inlet cavity in each pilot solenoid valve through a corresponding channel opened in the valve body.

[0018] In a preferred embodiment of the present invention, at least two valve core valve cavities connected to the end face of the valve body are provided in the valve body, and each backwash valve core module also includes a valve seat and a piston assembly, and the valve seat can be removably installed in the corresponding valve core valve cavity; an installation cavity is provided in the valve seat, and the piston assembly can be axially elastically moved in the installation cavity, and the working cavity is formed in the piston assembly, and the valve core liquid inlet hole and the valve core sewage discharge hole are both provided on the valve seat, and a plurality of valve core liquid holes connected to the working cavity are also provided on the piston assembly, and a control channel connected to the end face of the piston assembly is also provided on the valve seat, and the control channel can be connected to the liquid outlet cavity of the corresponding pilot solenoid valve, and the piston assembly can move axially to connect the valve core liquid hole with the valve core liquid inlet hole or the valve core sewage discharge hole.

[0019] In a preferred embodiment of the present invention, the outer wall of the piston assembly is formed with a first sealing step and a second sealing step arranged axially at intervals, and the valve core liquid hole is located between the first sealing step and the second sealing step; an elastic ring is also sleeved on the piston assembly, and the two ends of the elastic ring can respectively abut against the first sealing step and the limiting steps on the valve seat, and a sealing ring is provided on the inner wall of the installation cavity and between the first sealing step and the second sealing step; when the backwash valve core module is in a closed position, the first sealing step abuts against the first sealing surface of the sealing ring, and the valve core liquid hole is connected to the valve core liquid inlet hole; when the backwash valve core module is in an open position, the second sealing step abuts against the second sealing surface of the sealing ring, and the valve core liquid hole is connected to the valve core sewage discharge hole.

[0020] In a preferred embodiment of the present invention, the piston assembly includes a piston block and a piston rod, the piston block is provided with a receiving groove connected to its first end face, and the first end face of the piston block constitutes a second sealing step; the first end of the piston rod can be slidably inserted in the receiving groove, the working chamber, the valve core liquid hole and the first sealing step are all arranged on the piston rod, and the elastic ring sleeve is arranged on the piston rod; the control channel can be connected to the second end face of the piston block, and when the backwash valve core module is in a closed position, the second end face of the piston block can abut against the inner wall of the first end of the installation chamber, and there is a gap between the first end face of the piston rod and the bottom of the receiving groove.

[0021] In a preferred embodiment of the present invention, the valve seat includes a valve seat support block, a valve seat cylinder and an annular valve bonnet which are threadedly connected in sequence, the valve seat support block is arranged close to the end face of the valve body and can be threadedly connected to the inner wall of the valve core valve cavity; the inner wall of the annular valve bonnet, the inner wall of the valve seat cylinder and the first end face of the valve seat support block enclose a mounting cavity, the second end face of the piston block can abut against the first end face of the valve seat support block, the control channel, the valve core liquid inlet hole and the valve core sewage discharge hole are respectively arranged on the valve seat support block, the valve seat cylinder and the annular valve bonnet, the sealing ring is clamped between the valve seat cylinder and the annular valve bonnet, and a limit step is formed on the inner wall of the annular valve bonnet.

[0022] In a preferred embodiment of the present invention, a filter valve chamber connected to the end face of the valve body is further provided in the valve body; the backwash filter module also includes a filter housing, which can be detachably installed in the filter valve chamber; the liquid outlet chamber and the liquid intake hole are both provided on the filter housing, each filter chamber is formed between the outer wall of the filter housing and the inner wall of the filter valve chamber, and at least two annular chambers arranged along the axial direction are formed in the filter housing, and each filter screen is installed in the corresponding annular chamber; the filter housing is also provided with an inner liquid hole connecting the liquid outlet chamber and the annular chamber, and an outer liquid hole connecting the annular chamber and the filter chamber.

[0023] In a preferred embodiment of the present invention, the filter element housing includes a filter support block, an annular skeleton and an annular tail seat which are connected in sequence, the filter support block is arranged close to the end face of the valve body and can be threadedly connected to the inner wall of the filter element valve cavity; a filter cartridge assembly is sleeved outside the annular skeleton, and the two ends of the filter cartridge assembly are respectively connected to the filter support block and the annular tail seat; the filter cartridge assembly includes a plurality of axially arranged filter cartridges, and a support ring sleeved on the annular skeleton is connected between two adjacent filter cartridges; a filter cavity is formed between each filter cartridge and the inner wall of the filter element valve cavity, and an annular cavity is formed between each filter cartridge and the outer wall of the annular skeleton; the inner cavity of the annular skeleton forms a liquid outlet cavity, an inner liquid hole is provided on the annular skeleton, and an outer liquid hole is provided on each filter cartridge, and a liquid extraction hole is provided on the annular tail seat.

[0024] As described above, the backwashing filter device of the present invention has a modular design for the backwashing valve core module, the backwashing filter element module, the pilot solenoid valve module and the control module, which makes installation, replacement and maintenance more convenient. Through the cooperation of each module, when applied to the hydraulic support, the filtering and cleaning function of the high-pressure emulsion before flowing to the hydraulic support system can be realized, thereby ensuring the normal operation of the hydraulic support system. The control module can be detachably integrated on the valve body, which can realize automatic control and directly control the action of each pilot solenoid valve, and can complete the backwashing operation independently, which is more intelligent; the corresponding control program can be integrated in the control module, which can simplify the program of the main controller of the hydraulic support and simplify the control circuit. At the same time, a liquid collection hole is provided on the backwashing filter element module, so that the working fluid entering the pilot solenoid valve is first filtered, which can effectively improve the service life of the pilot solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0026] Figure 1 This is a front view of the backwashing filter device provided by the present invention.

[0027] Figure 2 This is a left side view of the backwashing filter device provided by the present invention.

[0028] Figure 3 for Figure 1 Sectional view along AA.

[0029] Figure 4 for Figure 1 Cross-sectional view along BB.

[0030] Figure 5 This is a schematic diagram of the structure of the control module provided by the present invention.

[0031] Figure 6 A cross-sectional view of a control module provided by the present invention.

[0032] Figure 7 A cross-sectional view of the blocking plate module provided by the present invention.

[0033] Description of Figure Numbers:

[0034] 1. Valve body; 11. Liquid inlet; 12. Liquid outlet; 121. U-shaped pin-type quick connector male connector; 13. Drain outlet;

[0035] 2. Backwash valve core module; 201. First backwash valve core module; 202. Second backwash valve core module; 21. Valve seat; 211. Valve seat support block; 2111. Control channel; 212. Valve seat cylinder; 2121. Valve core liquid inlet hole; 213. Annular valve cap; 22. Piston block; 221. Second sealing step; 222. Accommodating groove; 23. Piston rod; 231. Working chamber; 232. Valve core liquid through hole; 233. First sealing step; 24. Elastic ring; 25. Sealing ring;

[0036] 3. Backwash filter module; 31. Filter housing; 311. Filter support block; 312. Annular frame; 3121. Liquid outlet cavity; 3122. Inner liquid hole; 313. Filter cartridge; 3131. Outer liquid hole; 314. Support ring; 315. Annular tail seat; 32. Filter cavity; 321. First filter cavity; 322. Second filter cavity; 33. Filter screen; 331. First filter screen; 332. Second filter screen;

[0037] 4. Pilot solenoid valve module;

[0038] 5. Control module; 51. Sensor device; 511. Pressure sensor; 512. Pressure detection chamber; 52. Control circuit board; 53. Sensor mounting block; 54. Electrical connection block; 55. Front electrical connector; 56. Rear electrical connector;

[0039] 6. Blocking plate module; 61. Blocking plate; 62. Connecting piece; 63. Sealing ring;

[0040] 7. Pilot filter module; 71. Filter end cover; 711. Pilot outlet liquid chamber; 72. Pilot filter; 73. Pilot inlet liquid chamber; 74. Limiting ring. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0042] like Figures 1 to 7 As shown, this embodiment provides a backwashing filter device, comprising:

[0043] The valve body 1 has a liquid inlet 11, a liquid outlet 12 and a sewage outlet 13;

[0044] At least two backwash valve core modules 2, each backwash valve core module 2 has a working chamber 231, a valve core liquid inlet hole 2121 and a valve core sewage discharge hole, the valve core liquid inlet hole 2121 can be connected to the liquid inlet port 11, and the valve core sewage discharge hole can be connected to the sewage discharge port 13; when the backwash valve core module 2 is in the closed position, the working chamber 231 can be connected to the valve core liquid inlet hole 2121, and when it is in the open position, the working chamber 231 can be connected to the valve core sewage discharge hole;

[0045] The backwash filter cartridge module 3 includes a liquid outlet cavity 3121, a liquid intake hole, at least two filter cavities 32 and at least two filter screens 33. The liquid outlet cavity 3121 can be connected to each filter screen 33, the liquid intake hole and the liquid outlet 12. Each filter cavity 32 can be connected to the corresponding filter screen 33 and the corresponding working cavity 231 in the backwash valve cartridge module 2.

[0046] The pilot solenoid valve module 4 includes at least two pilot solenoid valves, each of which can control the corresponding backwash valve core module 2 to switch between the working position and the closed position; the liquid extraction hole can be connected to the liquid inlet cavity in each pilot solenoid valve;

[0047] And a control module 5, which is detachably connected to the valve body 1 and can control the actions of each pilot solenoid valve.

[0048] The backwashing filter device in this embodiment can be applied to the hydraulic support of coal mines to filter the high-pressure emulsion and then provide it to the hydraulic support. The entire backwashing liquid device has a normal liquid inlet working state and a filter element backwashing working state. When the device is in the normal liquid inlet working state, each backwashing valve core module 2 is in a closed position, and the liquid (such as high-pressure emulsion) enters through the liquid inlet 11, enters the valve core liquid inlet hole 2121 of each backwashing valve core module 2, and flows out through each working chamber 231 and enters each filter chamber 32 of the backwashing filter core module 3 respectively. After being filtered by each filter screen 33, most of the liquid enters the liquid outlet chamber 3121, and then is discharged from the liquid outlet 12 to supply the hydraulic support, and a small part of the liquid enters the liquid inlet chamber of each pilot solenoid valve through the liquid intake hole. When the device is in the filter element backwashing working state, the hydraulic support does not work, and the corresponding pilot solenoid valve is energized to make the corresponding backwashing valve core module 2 in the open position, so that the corresponding filter screen 33 can be reversely flushed.

[0049] Therefore, the backwashing filter device in this embodiment has a modular design of the backwashing valve core module 2, the backwashing filter element module 3, the pilot solenoid valve module 4 and the control module 5, which is more convenient to install, replace and maintain. Through the cooperation of each module, when applied to the hydraulic support, the filtering and cleaning function of the high-pressure emulsion before flowing to the hydraulic support system can be realized to ensure the normal operation of the hydraulic support system. The control module 5 can be detachably integrated on the valve body 1, which can realize automatic control and directly control the action of each pilot solenoid valve, and can complete the backwashing operation independently, which is more intelligent; the corresponding control program can be integrated in the control module 5, which can simplify the program of the main controller of the hydraulic support and simplify the control circuit. At the same time, a liquid collection hole is provided on the backwashing filter element module 3, so that the working fluid entering the pilot solenoid valve is first filtered, which can effectively improve the service life of the pilot solenoid valve.

[0050] In a specific implementation, each pilot solenoid valve also has a manual operation button.

[0051] Each pilot solenoid valve has a manual control end (i.e., a manual operation button) and an automatic control end (i.e., an interface end), and the automatic control end is electrically connected to the control module 5 so as to automatically control the on / off state of the pilot solenoid valve using the control module 5. When in use, the entire backwashing filter device can be directly installed on a corresponding hydraulic support of a coal mine, and the backwashing function can be realized by manually clicking the manual operation button on the pilot solenoid valve, or the control module 5 can be used to realize the automatic backwashing function operation, which is more intelligent.

[0052] The intelligent control modes of the control module 5 include but are not limited to manual control mode, time control mode and / or pressure difference control mode, etc. The operation method is more efficient and convenient, and the use and maintenance are simple and easy to operate.

[0053] In some embodiments, the control module 5 has a pressure difference control mode. When the control module 5 is in the pressure difference control mode, it can control the action of each pilot solenoid valve according to the front and rear inlet and outlet hydraulic pressure difference of the backwash filter element module 3 and the pressure difference preset value.

[0054] In some embodiments, the control module 5 has a time control mode. When the control module 5 is in the time control mode, it can control the action of each pilot solenoid valve according to preset time parameters. The preset time parameters include backwash start time, backwash warning time, backwash interval time and backwash flushing time.

[0055] In some embodiments, the control module 5 also has a manual control mode. When the control module 5 is in the manual control mode, the control module 5 can control the action of each pilot solenoid valve according to the manual control instruction.

[0056] In order to facilitate the setting of control parameters and the operator's operation, the control module 5 can be electrically connected to the main controller of the hydraulic support to use the control interface of the main controller to set the pressure difference preset value and preset time parameters; the control interface has a backwash button for operating to generate manual control instructions.

[0057] When the intelligent control mode of the control module 5 is the pressure difference control mode, the operator can input the preset pressure difference value in the controller interface, and the main controller can send the preset pressure difference value to the control module 5. The control module 5 compares and analyzes the absolute value of the front and rear inlet and outlet hydraulic pressure difference of the backwash filter element module 3 with the preset pressure difference value. When the absolute value of the front and rear inlet and outlet hydraulic pressure difference of the backwash filter element module 3 is greater than or equal to the pressure difference setting value, the control module 5 controls the pilot solenoid valve to start and automatically complete the backwashing function of each filter screen 33 in the backwash filter element module 3; when the absolute value of the front and rear inlet and outlet hydraulic pressure difference is lower than the preset pressure difference value, the backwashing action is stopped; if the pressure difference has not been reduced to below the preset pressure difference value for several rounds, the backwashing action is stopped and a warning is given. The intelligent control mode is equipped with relevant early warning and warning reminder functions.

[0058] When the intelligent control mode of the control module 5 is the time control mode, the operator sets the preset time parameters such as the backwash start time, the backwash warning time, the backwash interval time, the backwash flushing time (or the number of backwashing times) in the controller interface, and the main controller sends the preset time parameters to the control module 5. When the countdown is 0, the main controller sends a warning signal. After the backwash warning time is over, the control module 5 controls the pilot solenoid valve to start, and automatically completes the backwashing function of each filter screen 33 in the backwash filter element module 3 in sequence. After completing the backwashing flushing time or the number of backwashing times set by the parameters, the backwashing action is stopped.

[0059] When the intelligent control mode of the control module 5 is the manual control mode, the operator clicks the backwash button on the controller interface, the main controller generates a manual control instruction and sends the manual control instruction to the control module 5, the control module 5 controls the action of the pilot solenoid valve according to the manual control instruction, and then manually completes the backwash function of each filter screen 33 in the backwash filter element module 3.

[0060] In practical applications, the control module 5 can include a pressure difference control mode, a time control mode and a manual control mode at the same time, and the corresponding control mode can be selected on the controller interface during use.

[0061] In some embodiments, in order to facilitate the implementation of the pressure difference control mode, the valve body 1 also has two pressure detection ports, and the control module 5 includes a sensor device 51 and a control circuit board 52. The sensor device 51 is connected to the two pressure detection ports to respectively detect the liquid inlet pressure and liquid outlet pressure of the backwash filter element module 3; the control circuit board 52 is electrically connected to the sensor device 51 and can control the action of each pilot solenoid valve according to the data difference detected by the sensor device 51.

[0062] When the absolute value of the data difference detected by the sensor device 51 is greater than or equal to the preset pressure difference value, the control circuit board 52 controls each pilot solenoid valve to be energized in sequence, and each filter screen 33 is backwashed in sequence. After each filter screen 33 completes one backwash, it is considered a cycle, and the backwashing is completed after at least one backwashing cycle. Here, the sensor device 51 may include, for example, two pressure sensors 511 for pressure monitoring, and the pressure detection chambers 512 of the two pressure sensors 511 are respectively connected to the two pressure detection ports through corresponding channels. Alternatively, the sensor device 51 may also use a differential pressure sensor as needed.

[0063] Reference Figure 5 and Figure 6 In order to facilitate installation and connection, the control module 5 also includes a sensor mounting block 53, an electrical connection block 54, a front electrical connector 55 and a rear electrical connector 56. The sensor mounting block 53 and the electrical connection block 54 are connected up and down. Two pressure sensors 511 are arranged in the sensor mounting block 53. The control circuit board 52 is installed in the sensor mounting block 53. The front electrical connector 55 and the rear electrical connector 56 are respectively installed on opposite sides of the electrical connection block 54. The sensor mounting block 53 can be connected to the valve body 1 through fasteners (such as bolts). The front electrical connector 55 is used to connect to each pilot solenoid valve, and the rear electrical connector 56 is used to connect to the above-mentioned main controller. The control circuit board 52 integrates the control cables of the two pressure sensors 511 and the front electrical connector 55, and the rear electrical connector 56 outputs signals to realize intelligent control.

[0064] In some embodiments, the control module 5 mentioned above can be installed on the valve body 1 all the time. When manual control is implemented by using a manual operation button, the sensor device 51 in the control module 5 only detects but does not trigger any control operation.

[0065] In some other preferred embodiments, the backwash filter assembly further comprises a plugging plate module 6. When the control module 5 and the valve body 1 are in a disassembled state, the plugging plate module 6 can be detachably mounted on the valve body 1 and can block the two pressure detection ports.

[0066] Reference Figure 7 The plugging plate module 6 includes a plugging plate 61 and a connecting piece 62. Two sealing grooves are provided on the plugging plate 61. Sealing rings 63 are installed in the sealing grooves. The plugging plate 61 is connected to the valve body 1 through the connecting piece 62 (such as a bolt). The two sealing grooves can face the two pressure detection ports and use the sealing ring 63 to seal and block the two pressure detection ports.

[0067] The plugging plate module 6 is installed at the same position as the control module 5. Either the control module 5 or the plugging plate module 6 can be assembled according to actual needs. When the control module 5 is installed on the valve body 1, manual control can be achieved using a manual operation button, or the control module 5 can be used to achieve an intelligent control mode. When the plugging plate module 6 is installed on the valve body 1, manual control can be achieved using a manual operation button. In an optional solution, the pilot solenoid valve can also be directly electrically connected to the main controller so that the pilot solenoid valve can be remotely controlled by the main controller.

[0068] Furthermore, the backwash filtration device also includes a pilot filter module 7, which includes a pilot filter screen 72 and a pilot liquid inlet chamber 73 and a pilot liquid outlet chamber 711 that can be connected to the pilot filter screen 72. The pilot liquid inlet chamber 73 can be connected to the liquid extraction hole, and the pilot liquid outlet chamber 711 can be connected to the liquid inlet chamber in each pilot solenoid valve.

[0069] In this way, the control liquid entering the liquid inlet chamber of the pilot solenoid valve is obtained by filtering the high-pressure emulsion twice through the backwash filter module 3 and the pilot filter module 7, which further improves the service life of the pilot solenoid valve.

[0070] Specifically, refer to Figure 1 A pilot filter valve cavity communicating with the end face of the valve body 1 is provided in the valve body 1. The pilot filter module 7 further comprises a filter end cover 71 and a limit ring 74. The filter end cover 71 can be detachably installed in the pilot filter valve cavity. The pilot filter 72 is clamped and installed between the filter end cover 71 and the limit ring 74 (and the three are coaxially arranged). The pilot filter 72 and the inner wall of the pilot filter valve cavity are enclosed to form a pilot liquid inlet cavity 73. The inner cavity of the pilot filter 72 (that is, the cavity enclosed by the inner wall of the pilot filter 72) forms a pilot liquid outlet cavity 711. The pilot liquid outlet cavity 711 is connected with the liquid inlet cavity in each pilot solenoid valve through a corresponding channel provided in the valve body 1.

[0071] The pilot filter valve cavity is a cavity structure with an open first end and a closed second end, and its open end is connected to the end face of the valve body 1, and the filter end cover 71 is arranged close to the end face of the valve body 1. The pilot liquid outlet cavity 711 constitutes a channel structure with a closed first end and an open second end. The second end of the pilot liquid outlet cavity 711 is connected to the pilot filter valve cavity through the inner cavity of the limit ring 74, and a corresponding channel connecting the second end of the pilot filter valve cavity and the liquid inlet cavity of each pilot solenoid valve is opened in the valve body 1, so that the pilot liquid outlet cavity 711 is connected to the liquid inlet cavity of each pilot solenoid valve through the inner cavity of the limit ring 74 and the corresponding channel in the valve body 1, so as to filter and clean the control liquid in the liquid inlet cavity of the pilot solenoid valve in advance. The above-mentioned liquid extraction hole is connected to the pilot liquid inlet cavity 73 through the corresponding channel opened in the valve body 1.

[0072] After the entire filter end cover 71, the pilot filter 72 and the limit ring 74 are assembled, they form a module, which can be directly inserted into the pilot filter valve cavity and the outer wall of the filter end cover 71 is threadedly connected to the pilot filter valve cavity, making disassembly, assembly and replacement more convenient.

[0073] In this embodiment, one of the pressure detection ports is connected to the liquid inlet 11 through the corresponding channel in the valve body 1, so as to detect the liquid inlet pressure of the backwash filter cartridge module 3. For the liquid outlet pressure of the backwash filter cartridge module 3, another pressure detection port can be directly connected to the liquid outlet cavity 3121 of the backwash filter cartridge module 3 through the corresponding channel in the valve body 1, or directly connected to the liquid collection hole, and can also be connected to the above-mentioned lead-out liquid cavity 711; the liquid pressures at these locations are not too different, and can all be used as the liquid outlet pressure of the backwash filter cartridge module 3.

[0074] In this embodiment, it is more preferred to connect another pressure detection port with the above-mentioned pilot liquid chamber 711. In this way, if the pressure difference is still too high after the backwash filter element module 3 is backwashed multiple times, it can be determined that there is blockage in the pilot filter module 7, which can be used as a basis for indirectly judging whether the pilot filter module 7 is blocked, so as to replace the pilot filter module 7 in time. In this embodiment, the pressure detection chamber 512 of one of the pressure sensors 511 is connected to one of the pressure detection ports through the corresponding channel in the sensor mounting block 53 to communicate with the liquid inlet 11; the pressure detection chamber 512 of the other pressure sensor 511 is connected to the other pressure detection port through the corresponding channel in the sensor mounting block 53 to communicate with the pilot liquid chamber 711, thereby respectively detecting the inlet and outlet liquid pressures of the backwash filter element module 3, and feeding back the detection results to the control circuit board 52.

[0075] Furthermore, at least two valve core valve cavities connected to the end face of the valve body 1 are provided in the valve body 1, and each backwash valve core module 2 also includes a valve seat 21 and a piston assembly. The valve seat 21 can be removably installed in the corresponding valve core valve cavity; an installation cavity is provided in the valve seat 21, and the piston assembly can be axially elastically moved in the installation cavity, and a working cavity 231 is formed in the piston assembly. The valve core liquid inlet hole 2121 and the valve core sewage hole are both provided on the valve seat 21, and a plurality of valve core liquid holes 232 connected to the working cavity 231 are also provided on the piston assembly. A control channel 2111 that can be connected to the end face of the piston assembly is also provided on the valve seat 21, and the control channel 2111 can be connected to the liquid outlet cavity 3121 of the corresponding pilot solenoid valve. The piston assembly can move axially to connect the valve core liquid hole 232 with the valve core liquid inlet hole 2121 or the valve core sewage hole.

[0076] Specifically, refer to Figure 3The outer wall of the piston assembly is formed with a first sealing step 233 and a second sealing step 221 arranged axially at intervals, and the valve core liquid hole 232 is located between the first sealing step 233 and the second sealing step 221; an elastic ring 24 (such as a return spring) is also sleeved on the piston assembly, and the two ends of the elastic ring 24 can respectively abut against the first sealing step 233 and the limiting step on the valve seat 21, and a sealing ring 25 is provided on the inner wall of the installation cavity and between the first sealing step 233 and the second sealing step 221; when the backwash valve core module 2 is in the closed position, the first sealing step 233 abuts against the first sealing surface of the sealing ring 25, and the valve core liquid hole 232 is connected with the valve core liquid inlet hole 2121; when the backwash valve core module 2 is in the open position, the second sealing step 221 abuts against the second sealing surface of the sealing ring 25 (the first sealing surface and the second sealing surface are respectively located at the two end surfaces of the sealing ring 25), and the valve core liquid hole 232 is connected with the valve core sewage discharge hole.

[0077] Preferably, the piston assembly includes a piston block 22 and a piston rod 23. The piston block 22 is provided with a receiving groove 222 communicating with its first end face, and the first end face of the piston block 22 constitutes a second sealing step 221. The first end of the piston rod 23 can be slidably inserted into the receiving groove 222. The working chamber 231, the valve core liquid hole 232 and the first sealing step 233 are all provided on the piston rod 23, and the elastic ring 24 is sleeved on the piston rod 23. The control channel 2111 can be communicated with the second end face of the piston block 22. When the backwash valve core module 2 is in the closed position, the second end face of the piston block 22 can abut against the first end inner wall of the installation chamber (that is, the end inner wall of the installation chamber close to the end face of the valve body 1), and there is a gap between the first end face of the piston rod 23 and the bottom of the receiving groove 222. The gap should be smaller than the axial distance between the second sealing step 221 and the second sealing surface when the backwash valve core module 2 is in the closed position.

[0078] When the pilot solenoid valve is energized to allow the control fluid to enter through the corresponding control channel 2111, the control fluid acts on the second end face of the piston block 22 to push the piston block 22 to move. When the bottom of the receiving groove 222 in the piston block 22 abuts against the first end face of the piston rod 23, the piston block 22 pushes the piston rod 23 to move together until the second sealing step 221 abuts against the second sealing surface of the sealing ring 25, and the backwash valve core module 2 is in the open position. The piston assembly is designed as two parts, the piston block 22 and the piston rod 23, which can slide relative to each other. When the control channel 2111 has fluid, the piston block 22 is pushed first and then the piston rod 23 is pushed, which has a certain buffering effect and can increase the service life.

[0079] In order to facilitate processing and installation, the valve seat 21 includes a valve seat support block 211, a valve seat cylinder 212 and an annular valve bonnet 213 which are threadedly connected in sequence. The valve seat support block 211 is arranged close to the end face of the valve body 1 and can be threadedly connected to the inner wall of the valve core valve cavity; the inner wall of the annular valve bonnet 213, the inner wall of the valve seat cylinder 212 and the first end face of the valve seat support block 211 enclose a mounting cavity, the second end face of the piston block 22 can abut against the first end face of the valve seat support block 211, and the first end face of the valve seat support block 211 constitutes the first end inner wall of the mounting cavity; the control channel 2111, the valve core liquid inlet hole 2121 and the valve core sewage discharge hole are respectively opened on the valve seat support block 211, the valve seat cylinder 212 and the annular valve bonnet 213, the sealing ring 25 is clamped between the valve seat cylinder 212 and the annular valve bonnet 213, and the limiting step is formed on the inner wall of the annular valve bonnet 213.

[0080] The valve core valve cavity is a cavity structure with an open first end and a closed second end, and its open end is connected to the end face of the valve body 1. The working chamber 231 is formed in the piston rod 23 and extends along the axial direction of the piston rod 23, and is connected to the second end face of the piston rod 23. Corresponding channels are provided in the valve body 1 so that the valve core liquid inlet hole 2121 and the valve core sewage discharge hole are connected to the liquid inlet 11 and the sewage discharge port 13 respectively. In this embodiment, the valve seat 21 is divided into three sections for connection, which is more convenient for processing and assembly. After the entire valve seat 21, piston assembly, sealing ring 25, and elastic ring 24 are assembled, they form a module, which can be directly inserted into the valve core valve cavity and the outer wall of the valve seat support block 211 is threadedly connected to the valve core valve cavity, which is more convenient for disassembly, assembly and replacement.

[0081] Furthermore, a filter valve chamber connected to the end face of the valve body 1 is also provided in the valve body 1; the backwash filter module 3 also includes a filter housing 31, which can be detachably installed in the filter valve chamber; the liquid outlet chamber 3121 and the liquid intake hole are both provided on the filter housing 31, and each filter chamber 32 is formed between the outer wall of the filter housing 31 and the inner wall of the filter valve chamber, and at least two annular chambers arranged along the axial direction are formed in the filter housing 31, and each filter screen 33 is installed in the corresponding annular chamber; the filter housing 31 is also provided with an inner liquid hole 3122 connecting the liquid outlet chamber 3121 and the annular chamber, and an outer liquid hole 3131 connecting the annular chamber and the filter chamber 32.

[0082] Specifically, refer to Figure 4The filter cartridge housing 31 includes a filter support block 311, an annular frame 312 and an annular tail seat 315 which are connected in sequence. The filter support block 311 is arranged close to the end face of the valve body 1 and can be threadedly connected to the inner wall of the filter cartridge valve cavity. A filter cartridge assembly is sleeved outside the annular frame 312. The two ends of the filter cartridge assembly are respectively connected to the filter support block 311 and the annular tail seat 315. The filter cartridge assembly includes a plurality of filter cartridges 313 arranged axially. A filter cartridge 313 sleeved on the annular frame is connected between two adjacent filter cartridges 313. A support ring 314 on 312 (the outer wall of the support ring 314 can be against the inner wall of the filter element valve cavity); a filter cavity 32 is formed between each filter cartridge 313 and the inner wall of the filter element valve cavity, and an annular cavity is formed between each filter cartridge 313 and the outer wall of the annular skeleton 312; the inner cavity of the annular skeleton 312 forms a liquid outlet cavity 3121, an inner liquid hole 3122 is provided on the annular skeleton 312, and an outer liquid hole 3131 is provided on each filter cartridge 313, and the liquid extraction hole is provided on the annular tail seat 315.

[0083] The filter support block 311, the annular skeleton 312, the filter cartridge 313, the support ring 314 and the annular tail seat 315 can be connected to each other by adhesive bonding or other methods. The filter cartridge valve cavity can adopt a cavity structure with an open first end and a closed second end, and its open end is connected to the end face of the valve body 1, and a corresponding channel is opened in the valve body 1 to connect the liquid outlet cavity 3121 and the liquid outlet 12. Alternatively, the liquid outlet 12 can be arranged directly opposite the filter cartridge valve cavity and connected to the second end face of the filter cartridge valve cavity.

[0084] After the filter element housing 31, filter cartridge assembly, filter screen 33 and the like are assembled, a module is formed, which can be directly inserted into the filter element valve cavity and the outer wall of the filter support block 311 is threadedly connected to the filter element valve cavity, making disassembly, assembly and replacement more convenient.

[0085] In some embodiments, the liquid inlet 11 and the sewage outlet 13 are both connected with a female U-shaped pin-type quick connector for mining, and the liquid outlet 12 is connected with a male U-shaped pin-type quick connector 121 for mining.

[0086] It can be understood that a plurality of sealing rings 63 are also provided between the backwash valve core module 2, the backwash filter core module 3, the pilot filter module 7 and the corresponding valve chamber to ensure the sealing of the corresponding positions. The corresponding channels opened in the valve body 1 mentioned in this article include horizontal process holes and / or vertical process holes.

[0087] The end faces of the valve body 1 connected to the valve core valve cavity and the filter element valve cavity are the same end face, generally corresponding to the front face of the valve body 1, that is, Figure 1 The front side shown in the figure is more convenient for installation and maintenance. The pilot solenoid valve module 4 is installed on the top surface of the valve body 1 to control the reversing action of each backwash valve core module 2 to complete the backwashing of the filter element. The pilot filter module 7 is generally installed on the side of the valve body 1, that is, Figure 1 The control module 5 is installed on the other side of the valve body 1, that is, Figure 1 The right side is shown in .

[0088] The number of the backwash valve core modules 2, the number of the filter screens 33 in the backwash filter element module 3 and the number of the pilot solenoid valves in the pilot solenoid valve module 4 are the same, for example, two are provided in this embodiment. The following takes the number of these components as two, and the two backwash valve core modules 2 are respectively recorded as the first backwash valve core module 201 and the second backwash valve core module 202, the two filter screens 33 in the backwash filter element module 3 are respectively recorded as the first filter screen 331 and the second filter screen 332, the two filter chambers 32 are respectively recorded as the first filter chamber 321 and the second filter chamber 322, and the two pilot solenoid valves are respectively recorded as the first pilot solenoid valve and the second pilot solenoid valve. The working principle of the backwash filter device is described as follows:

[0089] In the working state, the high-pressure emulsion flows in from the liquid inlet 11 of the valve body 1, and reaches the working chambers 231 of the two backwash valve core modules 2 respectively through the valve core liquid inlet hole 2121 of the first backwash valve core module 201 and the valve core liquid inlet hole 2121 of the second backwash valve core module 202 (the valve core liquid inlet holes 2121 of the two backwash valve core modules 2 are connected, and the valve core sewage holes are connected). At this time, the two backwash valve core modules 2 are in the closed state, the valve core liquid inlet hole 2121 of the backwash valve core module 2 is connected with the working chamber 231, and the first backwash valve core module 2 The liquid in the working chamber 231 of 01 reaches the first filter chamber 321 in the backwash filter element module 3 through the corresponding channel in the valve body 1, and the liquid in the working chamber 231 of the second backwash valve core module 202 reaches the second filter chamber 322 in the backwash filter element module 3 through the corresponding channel in the valve body 1, and enters the liquid outlet chamber 3121 of the backwash filter element module 3 after being filtered by the first filter screen 331 and the second filter screen 332 respectively, and then most of the liquid flows to the liquid outlet 12; a small part of the liquid enters the liquid inlet chamber of each pilot solenoid valve through the liquid extraction hole.

[0090] When backwashing the first filter screen 331 in the backwash filter element module 3, manually press the manual operation button on the left side of the first pilot solenoid valve, or start the first pilot solenoid valve in the backwashing state of the intelligent control mode; the high-pressure liquid (i.e., the control liquid) of the first pilot solenoid valve controls the first backwash valve core module 201 through the control channel 2111 of the first backwash valve core module 201, pushes the piston block 22 and the piston rod 23 to move right to open the valve core, so that the working chamber 231 of the first backwash valve core module 201 is connected with the valve core drain hole, at this time, the emulsion reaches the working chamber 231 from the liquid inlet 11 of the valve body 1 through the valve core liquid inlet hole 2121 of the unopened second backwash valve core module 202, and the working chamber 231 is connected with the second filter chamber 322, and the second filter After being filtered by the filter screen 332, a part of the liquid flows back through the first filter screen 331, and flows from the first filter chamber 321 to the working chamber 231 of the first backwash valve core module 201, and then flows out of the drain port 13 of the valve body 1 through the valve core drain hole of the first backwash valve core module 201, thereby realizing the backwashing of the first filter screen 331 in the first backwash filter element module 3; since the liquid outlet 12 is still in an open state, a part of the liquid will flow to the liquid outlet 12 through the liquid outlet chamber 3121 of the backwash filter element module 3, and then enter the hydraulic support (since the drain port 13 is open at this time, the liquid pressure flowing to the hydraulic support is relatively small, and the hydraulic support is in a non-working state at this time); in addition, a small part of the liquid will enter the liquid inlet chamber of the first pilot solenoid valve and the second pilot solenoid valve through the liquid extraction hole.

[0091] Similarly, when the second filter screen 332 of the backwash filter element module 3 is backwashed, the manual operation button on the right side of the second pilot solenoid valve is manually pressed, or the second pilot solenoid valve is started in the backwash state of the intelligent control mode; the high-pressure liquid of the second pilot solenoid valve controls the second backwash valve core module 202 through the control channel 2111 of the second backwash valve core module 202, pushing the piston block 22 and the piston rod 23 corresponding to the second backwash valve core module 202 to move right to open the valve core, so that the working chamber 231 of the second backwash valve core module 202 is connected to the valve core drain hole, and the emulsion flows from the liquid inlet 11 of the valve body 1 through the valve core liquid inlet hole 212 of the unopened first backwash valve core module 201 1 reaches the working chamber 231, the working chamber 231 is connected with the first filter chamber 321, after being filtered by the first filter screen 331, a part of the liquid reversely flows through the second filter screen 332, and from the second filter chamber 322 to the working chamber 231 of the second backwashing valve core module 202, and then flows out of the drain port 13 of the valve body 1 through the valve core drain hole of the second backwashing valve core module 202, so as to realize the backwashing of the second filter screen 332 in the second backwashing filter element module 3; another part of the liquid will flow to the liquid outlet 12 through the liquid outlet chamber 3121 of the backwashing filter element module 3, and then enter the hydraulic support; in addition, a small part of the liquid will enter the liquid inlet chamber of the first pilot solenoid valve and the second pilot solenoid valve through the liquid taking hole.

[0092] In summary, the backwashing filter device in this embodiment has the following advantages:

[0093] (1) The backwash valve core module 2, the backwash filter element module 3 and the pilot filter module 7 all adopt a modular design with an integrated plug-in structure. For replacement and maintenance, it is only necessary to remove the module and replace it as a whole. The backwash valve core module 2 and the backwash filter element module 3 are both installed on the front of the valve body 1, making installation, replacement and maintenance more convenient and quick, greatly reducing the workload underground, and ensuring the safe and reliable operation of the backwash filter device.

[0094] (2) The control module 5 and the plugging plate module 6 adopt a modular design. The control module 5 is installed in the intelligent control mode, and the plugging plate module 6 is installed in the non-intelligent control mode. The two structures can be flexibly replaced, and either replacement method will not affect the normal use of the backwashing filter device. Costs can be saved according to actual working conditions, and installation and replacement are efficient and reliable.

[0095] (3) A pilot filter module 7 is provided so that the working fluid entering the liquid inlet chamber of the pilot solenoid valve first passes through the backwash filter module 3 and then passes through the pilot filter module 7, undergoing two filtrations in total, thereby effectively solving the problem of easy damage and frequent replacement of the solenoid pilot valve.

[0096] (4) The control module 5 is internally designed with an integrated control circuit board 52, which integrates two differential pressure sensors and electromagnetic pilot valve acquisition / control cables, etc., centrally outputs signals, reduces the number of cable connections, and makes wiring convenient and compact during on-site use.

[0097] (5) The entire device is an intelligent backwashing filtration device with a modular design, compact structure, high processing precision, and easy installation and maintenance. It can meet the filtering and cleaning needs of high-pressure emulsion before it flows into the support hydraulic system, and can realize the function of automatic backwashing of the filter element under manual control or remote intelligent control, thereby improving the emulsion filtration efficiency and the working efficiency of the comprehensive mining equipment.

[0098] The above are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A backwash filter device, characterized in that: include: A valve body having a liquid inlet, a liquid outlet and a sewage outlet; At least two backwash valve core modules, each of which has a working chamber, a valve core liquid inlet hole and a valve core sewage discharge hole, the valve core liquid inlet hole can be communicated with the liquid inlet port, and the valve core sewage discharge hole can be communicated with the sewage discharge port; when the backwash valve core module is in a closed position, the working chamber can be communicated with the valve core liquid inlet hole, and when it is in an open position, the working chamber can be communicated with the valve core sewage discharge hole; A backwash filter cartridge module, comprising a liquid outlet cavity, a liquid intake hole, at least two filter cavities and at least two filter screens, wherein the liquid outlet cavity can be communicated with each of the filter screens, the liquid intake hole and the liquid outlet, and each of the filter cavities can be communicated with the corresponding filter screen and the corresponding working cavity in the backwash valve cartridge module; The pilot solenoid valve module comprises at least two pilot solenoid valves, each of which can control the corresponding backwash valve core module to switch between an open position and a closed position; the liquid extraction hole can be connected to the liquid inlet cavity in each of the pilot solenoid valves; and a control module, wherein the control module is detachably connected to the valve body and can control the action of each of the pilot solenoid valves.

2. The backwashing filter device according to claim 1, characterized in that: Each of the pilot solenoid valves is also provided with a manual operation button; The control module has a pressure difference control mode and a time control mode. When the control module is in the pressure difference control mode, it can control the action of each pilot solenoid valve according to the front and rear inlet and outlet hydraulic pressure difference of the backwash filter element module and the pressure difference preset value; when the control module is in the time control mode, it can control the action of each pilot solenoid valve according to the preset time parameters, and the preset time parameters include the backwash start time, the backwash warning time, the backwash interval time and the backwash flushing time.

3. The backwashing filter device according to claim 2, characterized in that: The control module can be electrically connected to the main controller of the hydraulic support so as to set the pressure difference preset value and the preset time parameter by using the control interface of the main controller.

4. The backwashing filter device according to claim 3, characterized in that: The control module also has a manual control mode. The control interface has a backwash button for operating to generate manual control instructions. When the control module is in the manual control mode, the control module can control the action of each pilot solenoid valve according to the manual control instructions.

5. The backwash filter device according to claim 1, characterized in that The valve body is also provided with two pressure detection ports, and the control module includes a sensor device and a control circuit board. The sensor device is connected to the two pressure detection ports to respectively detect the liquid inlet pressure and liquid outlet pressure of the backwash filter element module; the control circuit board is electrically connected to the sensor device and can control the action of each of the pilot solenoid valves according to the data difference detected by the sensor device.

6. The backwashing filter device according to claim 5, characterized in that: The backwash filter assembly further comprises a plugging plate module. When the control module and the valve body are in a disassembled state, the plugging plate module can be detachably mounted on the valve body and can block the two pressure detection ports.

7. The backwashing filter device according to claim 1, characterized in that: The backwash filtration device also includes a pilot filter module, which includes a pilot filter screen and a pilot liquid inlet chamber and a pilot liquid outlet chamber that can be connected to the pilot filter screen. The pilot liquid inlet chamber can be connected to the liquid extraction hole, and the pilot liquid outlet chamber can be connected to the liquid inlet chamber in each of the pilot solenoid valves.

8. The backwashing filter device according to claim 7, characterized in that: A pilot filter valve cavity connected to the end face of the valve body is provided in the valve body, and the pilot filter module also includes a filter end cover and a limit ring, and the filter end cover can be detachably installed in the pilot filter valve cavity; the pilot filter clamp is installed between the filter end cover and the limit ring, and the pilot filter and the inner wall of the pilot filter valve cavity are enclosed to form the pilot liquid inlet cavity, and the inner cavity of the pilot filter forms the pilot liquid outlet cavity, and the pilot liquid outlet cavity is connected with the liquid inlet cavity in each of the pilot solenoid valves through a corresponding channel provided in the valve body.

9. The backwashing filter device according to claim 1, characterized in that: At least two valve core valve cavities communicating with the end surface of the valve body are provided in the valve body, and each of the backwash valve core modules further comprises a valve seat and a piston assembly, and the valve seat is detachably mounted in the corresponding valve core valve cavity; The valve seat is provided with an installation cavity, the piston assembly is axially elastically movable in the installation cavity, the working cavity is formed in the piston assembly, the valve core liquid inlet hole and the valve core sewage discharge hole are both provided on the valve seat, a plurality of valve core liquid holes communicating with the working cavity are also provided on the piston assembly, a control channel communicating with the end face of the piston assembly is also provided on the valve seat, the control channel can be communicated with the corresponding liquid outlet cavity of the pilot solenoid valve, and the piston assembly can axially move to communicate the valve core liquid hole with the valve core liquid inlet hole or the valve core sewage discharge hole.

10. The backwashing filter device according to claim 9, characterized in that: The outer wall of the piston assembly is formed with a first sealing step and a second sealing step arranged axially at intervals, and the valve core liquid hole is located between the first sealing step and the second sealing step; An elastic ring is also sleeved on the piston assembly, and the two ends of the elastic ring can respectively abut against the first sealing step and the limiting step on the valve seat, and a sealing ring is provided on the inner wall of the installation cavity and between the first sealing step and the second sealing step; when the backwash valve core module is in a closed position, the first sealing step abuts against the first sealing surface of the sealing ring, and the valve core liquid hole is connected with the valve core liquid inlet hole; when the backwash valve core module is in an open position, the second sealing step abuts against the second sealing surface of the sealing ring, and the valve core liquid hole is connected with the valve core sewage discharge hole.

11. The backwashing filter device according to claim 10, characterized in that: The piston assembly comprises a piston block and a piston rod, the piston block is provided with a receiving groove communicating with a first end face thereof, the first end face of the piston block constitutes the second sealing step; the first end of the piston rod is slidably inserted into the receiving groove, the working chamber, the valve core liquid hole and the first sealing step are all provided on the piston rod, and the elastic ring sleeve is provided on the piston rod; The control channel can be connected to the second end face of the piston block. When the backwash valve core module is in a closed position, the second end face of the piston block can abut against the first end inner wall of the mounting cavity. There is a gap between the first end face of the piston rod and the bottom of the accommodating groove.

12. The backwashing filter device according to claim 11, characterized in that: The valve seat comprises a valve seat support block, a valve seat cylinder and an annular valve cap which are threadedly connected in sequence, wherein the valve seat support block is arranged close to the end surface of the valve body and can be threadedly connected to the inner wall of the valve core valve cavity; The inner wall of the annular valve bonnet, the inner wall of the valve seat cylinder and the first end face of the valve seat support block enclose the installation cavity. The second end face of the piston block can abut against the first end face of the valve seat support block. The control channel, the valve core liquid inlet hole and the valve core sewage discharge hole are respectively arranged on the valve seat support block, the valve seat cylinder and the annular valve bonnet. The sealing ring is clamped between the valve seat cylinder and the annular valve bonnet. The limiting step is formed on the inner wall of the annular valve bonnet.

13. The backwashing filter device according to claim 1, characterized in that: A filter valve cavity communicating with the end surface of the valve body is also provided in the valve body; the backwash filter module also includes a filter housing, which is detachably mounted in the filter valve cavity; The liquid outlet cavity and the liquid intake hole are both arranged on the filter element housing, each of the filter cavities is formed between the outer wall of the filter element housing and the inner wall of the filter element valve cavity, at least two annular cavities are formed in the filter element housing along the axial direction thereof, and each of the filter screens is installed in the corresponding annular cavity; The filter element housing is also provided with an inner liquid hole communicating with the liquid outlet cavity and the annular cavity, and an outer liquid hole communicating with the annular cavity and the filter cavity.

14. The backwashing filter device according to claim 13, characterized in that: The filter element housing comprises a filter support block, an annular frame and an annular tail seat which are connected in sequence, wherein the filter support block is arranged close to the end surface of the valve body and can be threadedly connected to the inner wall of the filter element valve cavity; A filter cartridge assembly is sleeved outside the annular skeleton, and two ends of the filter cartridge assembly are respectively connected to the filter support block and the annular tail seat; the filter cartridge assembly includes a plurality of filter cartridges arranged axially, and a support ring sleeved on the annular skeleton is connected between two adjacent filter cartridges; a filter cavity is formed between each filter cartridge and the inner wall of the filter element valve cavity, and an annular cavity is formed between each filter cartridge and the outer wall of the annular skeleton; the inner cavity of the annular skeleton forms the liquid outlet cavity, the inner liquid hole is provided on the annular skeleton, the outer liquid hole is provided on each filter cartridge, and the liquid extraction hole is provided on the annular tail seat.

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