An integrated filtration system and control method for pumps

Abstract

This invention discloses an integrated filtration system and control method for pumps. The integrated filtration system includes a filter, a safety valve, an electronic differential pressure valve, a controller, and a variable displacement control valve. The filter's inlet is connected to the outlet of a make-up pump, and the filter's outlet is connected to the first and second ports of a plunger pump. The electronic differential pressure valve is used to detect the pressure difference between the filter's inlet and outlet. The controller is configured to: acquire the pressure difference between the filter's inlet and outlet; compare the pressure difference with a preset value; in response to the pressure difference being greater than or equal to a first preset value, control an alarm module to issue an alarm; in response to the pressure difference being greater than or equal to a second preset value, control the electromagnets at both ends of the variable displacement control valve to de-energize and return to the neutral position, thereby driving the plunger pump's swashplate angle back to zero, resulting in zero theoretical output flow of the plunger pump. The remaining service life of the filter element is predicted based on the pressure difference and displayed to remind the user to replace the filter element.

Description

Technical Field

[0001] This invention relates to an integrated filtration system and control method for pumps, belonging to the field of hydraulic pumps. Background Technology

[0002] With technological advancements, the electrification and integration of hydraulic systems in agricultural machinery are increasing, placing higher demands on their reliability. The core of the entire agricultural machinery hydraulic system is the hydraulic pump.

[0003] Because agricultural machinery often operates in mountainous areas and fields, where the working environment is relatively harsh, the cleanliness of the hydraulic fluid in the entire hydraulic system is prone to exceed the standard. Therefore, traditional hydraulic pumps are easily damaged because particulate impurities can enter the rotating body of the pump due to oil contamination.

[0004] The existing technology has the following disadvantages: (1) The existing technology does not consider the problem of hydraulic pump failure caused by impurities clogging the filter screen after the filter element has been used for a period of time. Therefore, there is no warning or prompt for filter screen replacement. Once clogging occurs, it will directly cause the hydraulic pump plunger chamber to suck in air, resulting in damage to the hydraulic pump. (2) Once the filter screen is clogged and the hydraulic pump suddenly stops working, it may not only cause economic losses due to work stoppage, but also cause the main machine to suddenly stop during operation, resulting in operational risks that affect personal safety. (3) Filter element replacement is inconvenient. Summary of the Invention

[0005] Objective: In view of at least one of the above technical problems, the present invention provides an integrated filtration system and control method for pumps, which integrates an electronic differential pressure valve to effectively prevent impurities in the oil tank from entering the hydraulic pump cavity with the hydraulic oil and causing irreversible damage to the pump.

[0006] According to one aspect of this application, an integrated filtration system for a pump is provided, including a make-up pump, a variable piston and a plunger pump swashplate, and further including a filter, a safety valve, an electronic differential pressure valve, a controller and a variable control valve;

[0007] The filter's inlet is connected to the oil outlet of the replenishing pump, and the filter's outlet is connected to the first and second ports of the plunger pump, respectively. One end of the electronic differential pressure valve is connected to the filter's inlet, and the other end is connected to the filter's outlet. It is used to detect the pressure difference between the filter's inlet and outlet and to transmit the pressure difference to the controller. The electronic differential pressure valve is signal-connected to the controller.

[0008] The inlet of the variable control valve is connected to the outlet of the filter, the first working port is connected to the first chamber of the variable piston, the second working port is connected to the second chamber of the variable piston, and the electromagnets at both ends of the variable control valve are connected to the controller signal; the plunger pump swashplate is rigidly connected to the variable piston; it is used to control the displacement of the variable piston through the variable control valve, thereby adjusting the output flow of the plunger pump;

[0009] The variable control valve is an electro-proportional directional valve and has at least a first working position, a second working position, and a neutral position. When the variable control valve is in the first or second working position, hydraulic oil enters the first and second chambers of the variable piston through the variable control valve, thereby driving the swashplate of the piston pump to move and causing the output flow of the piston pump to change. When the variable control valve is in the neutral position, no hydraulic oil enters the first or second chamber of the variable piston, the variable piston is in the neutral position, and the theoretical output flow of the piston pump is zero.

[0010] The controller is configured to: acquire the pressure difference between the oil inlet and the oil outlet of the filter; compare the pressure difference with a preset value; the preset value includes a first set value and a second set value, and the first set value is less than the second set value;

[0011] In response to the differential pressure being greater than or equal to a first set value, the alarm module is controlled to issue an alarm.

[0012] In response to the differential pressure being greater than or equal to the second set value, the electromagnets at both ends of the control variable control valve are de-energized and return to the neutral position, thereby driving the swashplate of the plunger pump to return to the zero position, and the theoretical output flow of the plunger pump is zero.

[0013] In some embodiments, the integrated filtration system for pumps further includes a filter cartridge life prediction module, used to: predict the remaining service life of the filter cartridge based on the pressure difference.

[0014] Furthermore, in some embodiments, the filter life prediction module is specifically used for:

[0015] Based on the pressure difference, the filter element life prediction model is used to predict the filter element usage time; wherein the filter element life prediction model stores the linear relationship between the pressure difference between the filter inlet and outlet and the filter element usage time.

[0016] The remaining service life of the filter element is obtained based on the predicted filter element usage time and the preset total service life of the filter element.

[0017] Furthermore, in some embodiments, the integrated filtration system for pumps further includes a display module connected to the controller for displaying the remaining service life of the filter element.

[0018] In some embodiments, the integrated filtration system for the pump further includes a safety valve, the first end of which is connected to the oil inlet of the filter (the outlet of the replenishing pump), the second end of which is connected to the suction port of the replenishing pump, and the control end of which is connected to the outlet of the filter; when the pressure difference between the oil inlet and the outlet of the filter is greater than or equal to a third set value, the safety valve changes from a closed state to an open state, and the oil at the oil inlet of the filter (the outlet of the replenishing pump) returns directly to the suction port of the replenishing pump through the safety valve; wherein the third set value is greater than a second set value.

[0019] In some embodiments, the variable control valve is a three-position four-way electro-proportional directional valve;

[0020] When the electromagnet at the first end of the variable control valve is energized, the hydraulic oil enters the first chamber (left chamber) of the variable piston through the first working position (left position) of the variable control valve. The variable piston moves to the right, pushing the plunger pump swashplate from the middle position to the direction of maximum displacement.

[0021] When the electromagnet at the second end of the variable control valve is energized, the hydraulic oil enters the second chamber (right chamber) of the variable piston through the second working position (right position) of the variable control valve. The variable piston moves to the left, pushing the plunger pump swashplate from the middle position to the direction of maximum negative displacement.

[0022] When neither the first nor the second electromagnet of the variable control valve is energized, the variable control valve is in the neutral position, and the variable piston drives the swashplate of the plunger pump to return to the zero position, so the theoretical output flow of the plunger pump is zero.

[0023] In some embodiments, the oil outlet of the integrated filter system for the pump is further provided with an oil replenishment overflow valve, a first overflow valve is provided between the oil outlet of the filter and the first port of the plunger pump, and a second overflow valve is provided between the oil outlet of the filter and the second port of the plunger pump. The first overflow valve and the second overflow valve have the same structure and have at least a first working state and a second working state.

[0024] In the first working state, the first port of the first relief valve and the second relief valve are connected to the second port in one direction through the check valve inside the valve, and the hydraulic oil at the oil outlet of the filter is replenished to the low-pressure side of the main oil circuit of the plunger pump through the first relief valve or the second relief valve.

[0025] When the oil pressure on the high-pressure side of the main oil circuit of the plunger pump exceeds the fourth set value, the corresponding first relief valve or second relief valve is in the second working state, the second port is connected to the first port, and the hydraulic oil on the high-pressure side of the main oil circuit is discharged back to the oil tank through the replenishment relief valve.

[0026] In some embodiments, the integrated filtration system for pumps further includes a filter housing, on which the filter, safety valve, and electronic differential pressure valve are mounted.

[0027] Furthermore, in some embodiments, the filter seat has at least one of the following structures: a mounting surface structure that mates with a plate-type electronic differential pressure valve, and a mounting hole structure that mates with a threaded cartridge-type electronic differential pressure valve.

[0028] According to another aspect of this application, a control method for an integrated filtration system for pumps is provided, wherein the integrated filtration system for pumps is as described above, and the control method includes:

[0029] Obtain the pressure difference between the oil inlet and outlet of the filter;

[0030] The pressure difference is compared with a preset value; the preset value includes a first set value and a second set value, and the first set value is less than the second set value;

[0031] In response to the differential pressure being greater than or equal to a first set value, the alarm module is controlled to issue an alarm.

[0032] In response to the differential pressure being greater than or equal to the second set value, the electromagnets at both ends of the control variable control valve are de-energized and return to the neutral position, thereby driving the swashplate of the plunger pump to return to the zero position, and the theoretical output flow of the plunger pump is zero.

[0033] The remaining service life of the filter element is predicted based on the pressure difference and sent to the display module to display the remaining service life of the filter element.

[0034] The beneficial effects achieved by this invention are as follows: This invention provides an integrated filtration system on a hydraulic pump, equipped with an electronic differential pressure valve. The electronic differential pressure valve monitors the pressure difference between the filter's inlet and outlet, triggering an alarm when a set value is reached. It also controls the variable valve to return to the neutral position, preventing damage to the plunger pump due to cavitation. Furthermore, it features filter element lifespan prediction and replacement warning functions. Not only can the predicted remaining lifespan be seen during daily use, but warnings also prompt filter element replacement. This ensures that the machine owner is not affected by sudden downtime due to filter element blockage in the integrated hydraulic pump filtration system, thus preventing economic losses and personal safety risks. It also maximizes the utilization of the entire filter element's lifespan, reducing overall machine maintenance and operating costs. When the filter element becomes clogged, the oil at the filter inlet can be returned to the suction port of the replenishing pump via a safety valve, preventing component damage due to pressure buildup. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of an integrated filtration system for pumps according to an embodiment of the present invention;

[0036] In the diagram: Filter seat 1, Filter 2, Safety valve 3, Electronic differential pressure valve 4, Controller 5, Central control panel 6, Buzzer alarm 7, Variable control valve 8, Variable piston 9, Plunger pump swashplate 10, Make-up pump 11, First relief valve 12, Second relief valve 13, Make-up relief valve 14. Detailed Implementation

[0037] The present application will be further described below with reference to the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and should not be used to limit the scope of protection of the present application.

[0038] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0041] It should be noted that similar symbols and letters in the following figures represent similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0042] To address the problem of particulate impurities entering the rotating body of existing plunger pumps due to oil contamination, which leads to damage to the hydraulic pump, this application proposes an integrated filtration system and control method for pumps. A filtration system is installed outside the main oil circuit of the plunger pump, and the filter element and filter screen are easy to replace.

[0043] Example 1: This example provides an integrated filtration system for pumps, such as... Figure 1As shown, it specifically includes a replenishing pump 11, a variable piston 9, and a plunger pump swashplate 10, as well as a filter 2, a safety valve 3, an electronic differential pressure valve 4, a controller 5, and a variable control valve 8;

[0044] The filter 2, safety valve 3, and electronic differential pressure valve 4 are mounted on the filter base 1.

[0045] The inlet of filter 2 is connected to the outlet of oil replenishment pump 11, and the outlet of filter 2 is connected to the first port and the second port of plunger pump respectively; one end of electronic differential pressure valve 4 is connected to the inlet of filter 2, and the other end is connected to the outlet of filter 2, used to detect the pressure difference between the inlet and outlet of filter 2, and transmit the pressure difference to controller 5; electronic differential pressure valve 4 is signal connected to controller 5.

[0046] The inlet of the variable control valve 8 is connected to the outlet of the filter 2, the first working port is connected to the first chamber of the variable piston 9, and the second working port is connected to the second chamber of the variable piston 9. The electromagnets at both ends of the variable control valve 8 are signal-connected to the controller 5. The plunger pump swashplate 10 is rigidly connected to the variable piston 9. It is used to control the displacement of the variable piston 9 through the variable control valve 8, thereby adjusting the output flow of the plunger pump.

[0047] The variable control valve 8 is an electro-proportional directional valve and has at least a first working position, a second working position, and a neutral position. When the variable control valve 8 is in the first working position or the second working position, hydraulic oil enters the first chamber and the second chamber of the variable piston 9 through the variable control valve 8, thereby driving the plunger pump swashplate 10 to move and causing the output flow of the plunger pump to change. When the variable control valve 8 is in the neutral position, no hydraulic oil enters the first chamber and the second chamber of the variable piston 9, the variable piston 9 is in the neutral position, and the theoretical output flow of the plunger pump is zero.

[0048] The controller 5 is configured as follows:

[0049] Obtain the pressure difference between the oil inlet and outlet of filter 2;

[0050] The pressure difference is compared with a preset value; the preset value includes a first set value and a second set value, and the first set value is less than the second set value;

[0051] In response to the differential pressure being greater than or equal to a first set value, the alarm module is controlled to issue an alarm.

[0052] In response to the differential pressure being greater than or equal to the second set value, the electromagnets at both ends of the control variable valve 8 are de-energized and return to the neutral position, thereby driving the swashplate of the plunger pump back to the zero position, and the theoretical output flow of the plunger pump is zero. In this embodiment, the alarm module uses a buzzer alarm 7, which is signal-connected to the controller 5.

[0053] The integrated filtration system for pumps further includes a filter cartridge life prediction module, used to: predict the remaining service life of the filter cartridge based on the pressure difference. In some embodiments, the filter cartridge life prediction module is specifically used to:

[0054] Based on the pressure difference, the filter element life prediction model is used to predict the filter element usage time; wherein the filter element life prediction model stores the linear relationship between the pressure difference between the filter inlet and outlet and the filter element usage time.

[0055] The remaining service life of the filter element is obtained based on the predicted filter element usage time and the preset total service life of the filter element.

[0056] Furthermore, the integrated filtration system for the pump also includes a display module connected to the controller 5 for displaying the remaining service life of the filter element. In this embodiment, the display module is a central control screen 6, which facilitates the owner to replace the filter element after the last operation.

[0057] The function of filter 2 is to filter the oil entering the hydraulic pump, so that particulate impurities are intercepted at the filter screen, thereby protecting the rotor assembly of the plunger pump from damage. It should be noted that, in order to prevent component damage caused by pressure buildup when the filter element becomes clogged, the integrated filtration system for the pump also includes a safety valve 3. The first end of the safety valve 3 is connected to the oil inlet of filter 2 (the oil outlet of the replenishing pump 11), the second end of the safety valve 3 is connected to the oil suction port of the replenishing pump 11, and the control end of the safety valve 3 is connected to the oil outlet of filter 2. When the pressure difference between the oil inlet and the oil outlet of filter 2 is greater than or equal to a third set value, the safety valve 3 changes from the closed state to the open state, and the oil at the oil inlet of filter 2 (the oil outlet of the replenishing pump 11) returns directly to the oil suction port of the replenishing pump 11 through the safety valve 3; wherein the third set value is greater than the second set value. In this embodiment, the safety valve is not only simple in structure, but also effectively ensures that in the event of filter element blockage and electronic component failure, the oil in the filter inlet is discharged to the oil inlet of the replenishing pump, thus preventing pressure buildup.

[0058] In some embodiments, the first setting value is 0.4 MPa, the second setting value is 0.5 MPa, and the third setting value is 0.6 MPa.

[0059] In this embodiment, the system has three levels of safety protection measures for filter blockage. First priority: When the pressure difference across filter 2 is ≥0.4MPa, the pressure difference signal is transmitted to controller 5, which sends a current signal to buzzer alarm 7, triggering an alarm. At this time, the predicted remaining service life of the filter is also set at the factory preset remaining service life with a pressure difference of 0.5MPa as the zero point, indicating the expected wear of the filter element. Second priority: When the pressure difference is ≥0.5MPa, the pressure difference signal is transmitted to controller, which de-energizes the electromagnets at both ends a and b of variable directional valve 8, thereby controlling the plunger pump to be in a zero-position idling state. Third priority: When the pressure difference is ≥0.6MPa, safety valve 3 changes from closed to open under the pressure difference between the left and right chambers, allowing the oil pressure at the outlet of the replenishing pump to flow directly back to the oil inlet of the replenishing pump, thus avoiding the occurrence of pressure buildup.

[0060] In some embodiments, such as Figure 1 As shown, the variable control valve 8 is a three-position four-way electro-proportional directional valve;

[0061] When the first electromagnet a of the variable control valve 8 is energized, the hydraulic oil enters the first chamber (left chamber) of the variable piston 9 through the first working position (left position) of the variable control valve 8. Under the action of the high pressure oil, the variable piston 9 moves to the right, pushing the plunger pump swashplate 10 from the middle position to the direction of maximum displacement.

[0062] When the electromagnet b at the second end of the variable control valve 8 is energized, the hydraulic oil enters the second chamber (right chamber) of the variable piston 9 through the second working position (right position) of the variable control valve 8. Under the action of the high-pressure oil, the variable piston 9 moves to the left, pushing the plunger pump swashplate 10 from the middle position to the direction of maximum negative displacement.

[0063] When neither the first electromagnet a nor the second electromagnet b of the variable control valve 8 is energized, the variable control valve 8 is in the neutral position. The variable piston 9 drives the plunger pump swashplate 10 to swing back to the zero position, and the theoretical output flow of the plunger pump is zero. At this time, no matter how high the pump speed is, the inlet and outlet flow of the plunger pump is always zero. Therefore, when the plunger pump is in the zero state, there is no problem of cavitation.

[0064] The filter holder 1 connects the entire filter assembly to the hydraulic pump. Through an internal oil passage, hydraulic oil entering the hydraulic pump is first filtered by the filter assembly before entering the pump's rotor assembly. In some embodiments, the filter holder 1 may have one or both of the following structures: a mounting surface structure that mates with a plate-type electronic differential pressure valve, and a mounting hole structure that mates with a threaded cartridge-type electronic differential pressure valve. Alternatively, a buzzer alarm may be integrated into the filter holder 1.

[0065] In some embodiments, such as Figure 1 As shown, the oil outlet of the filter 2 is also provided with an oil replenishment overflow valve 14, a first overflow valve 12 is provided between the oil outlet of the filter 2 and the first port of the plunger pump, and a second overflow valve 13 is provided between the oil outlet of the filter 2 and the second port of the plunger pump. The first overflow valve 12 and the second overflow valve 13 have the same structure and have at least a first working state and a second working state.

[0066] In the first working state, the first port I of the first relief valve 12 and the second relief valve 13 is connected to the second port II in one direction through the check valve inside the valve, and the hydraulic oil at the outlet of the filter 2 is replenished to the low-pressure side of the main oil circuit of the plunger pump through the first relief valve 12 or the second relief valve 13.

[0067] When the oil pressure on the high-pressure side of the main oil circuit of the plunger pump exceeds the fourth set value, the corresponding first relief valve 12 or second relief valve 13 is in the second working state, the second port II is connected to the first port I, and the hydraulic oil on the high-pressure side of the main oil circuit is discharged back to the oil tank through the replenishment relief valve 14.

[0068] Since the working ports A and B of the closed pump are not connected to the oil tank, the flow loss caused by internal leakage requires the replenishing oil pump 11 to replenish oil to the low-pressure side. At the same time, another part of the oil enters the control variable piston 9 through the variable reversing valve 8 to push the piston to move. The swashplate is rigidly connected to the piston. When the variable piston moves, the plunger pump swashplate 10 moves, causing the output flow of the plunger pump to change.

[0069] Example 2: Based on Example 1, this example provides a control method for an integrated filtration system for pumps, wherein the integrated filtration system for pumps is any of the aforementioned integrated filtration systems for pumps, and the control method includes:

[0070] Obtain the pressure difference between the oil inlet and outlet of filter 2;

[0071] The pressure difference is compared with a preset value; the preset value includes a first set value and a second set value, and the first set value is less than the second set value;

[0072] In response to the differential pressure being greater than or equal to a first set value, the alarm module is controlled to issue an alarm.

[0073] In response to the differential pressure being greater than or equal to the second set value, the electromagnets at both ends of the control variable control valve 8 are de-energized and return to the neutral position, thereby driving the swashplate of the plunger pump to return to the zero position, and the theoretical output flow of the plunger pump is zero.

[0074] The remaining service life of the filter element is predicted based on the pressure difference and sent to the display module to display the remaining service life of the filter element.

[0075] In some embodiments, the step of predicting the remaining service life of the filter element based on the pressure difference includes: predicting the filter element usage time using a filter element life prediction model based on the pressure difference; wherein the filter element life prediction model stores a linear relationship between the pressure difference between the filter inlet and outlet and the filter element usage time.

[0076] The remaining service life of the filter element is obtained based on the predicted filter element usage time and the preset total service life of the filter element.

[0077] In some embodiments, the control method for the integrated filter system for the pump further includes: controlling the working position of the variable control valve 8 according to the output flow demand of the plunger pump, thereby adjusting the output flow of the plunger pump, and the output flow of the plunger pump supplies oil to the mechanical hydraulic system through working ports A and B.

[0078] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An integrated filtration system for a pump comprising an oil makeup pump, a variable piston, and a swash plate of a piston pump, characterized by, The filter, the safety valve, the electronic pressure differential valve, the controller and the variable control valve are further included. The oil inlet of the filter is connected to the oil outlet of the oil supplement pump, and the oil outlets of the filter are respectively connected to the first port and the second port of the plunger pump. The electronic pressure differential valve is connected to the oil inlet and the oil outlet of the filter, and is used to detect the pressure difference between the oil inlet and the oil outlet of the filter and transmit the pressure difference to the controller. The inlet of the variable control valve is connected to the oil outlet of the filter, the first working oil port is connected to the first cavity of the variable piston, the second working oil port is connected to the second cavity of the variable piston, and the electromagnets at both ends of the variable control valve are connected to the controller. The variable piston is rigidly connected to the swash plate of the plunger pump. The variable control valve is an electric proportional directional valve, and has at least a first working position, a second working position and a neutral position. When the variable control valve is in the first working position or the second working position, hydraulic oil enters the first cavity and the second cavity of the variable piston through the variable control valve, thereby driving the swash plate of the plunger pump to move and changing the output flow of the plunger pump.

2. The integrated filtration system for a pump of claim 1, wherein, When the variable control valve is in the neutral position, no hydraulic oil enters the first cavity and the second cavity of the variable piston, the variable piston is in the neutral state, and the theoretical output flow of the plunger pump is zero.

3. The integrated filtration system for a pump of claim 2, wherein, The controller is configured to: acquire the pressure difference between the oil inlet and the oil outlet of the filter; compare the pressure difference with a preset value; the preset value includes a first set value and a second set value, and the first set value is smaller than the second set value. In response to the pressure difference being greater than or equal to the first set value, the controller controls the alarm module to issue an alarm. In response to the pressure difference being greater than or equal to the second set value, the controller controls the electromagnets at both ends of the variable control valve to lose power and return to the neutral position, thereby driving the swash plate of the plunger pump to return to the zero position and the theoretical output flow of the plunger pump to be zero.

4. The integrated filtration system for a pump of claim 2 or 3, wherein, The filter core life prediction module is further included, and is configured to: predict the pressure difference to obtain the remaining service life of the filter core.

5. The integrated filtration system for a pump of claim 1, wherein, The filter core life prediction module is specifically configured to:

6. The integrated filtration system for a pump of claim 1, wherein, predict the filter core service time prediction value by using a filter core life prediction model according to the pressure difference; the filter core life prediction model stores a linear relationship between the pressure difference between the oil inlet and the oil outlet of the filter and the filter core service time. obtain the remaining service life of the filter core according to the filter core service time prediction value and a preset total filter core service life. The display module connected to the controller is further included, and is configured to display the remaining service life of the filter core. The safety valve is further included, a first end of the safety valve is connected to the oil inlet of the filter, a second end of the safety valve is connected to the oil suction port of the oil supplement pump, and a control end of the safety valve is connected to the oil outlet of the filter. When the pressure difference between the oil inlet and the oil outlet of the filter is greater than or equal to a third set value, the safety valve changes from a closed state to an open state, and the oil at the oil inlet of the filter returns directly to the oil suction port of the oil supplement pump through the safety valve; the third set value is greater than the second set value. The variable control valve is a three-position four-way electric proportional directional valve. When the first end electromagnet of the variable control valve is powered, hydraulic oil enters the first cavity of the variable piston through the first working position of the variable control valve, the variable piston moves to the right, and the plunger pump swash plate is driven to move from the neutral position to the positive maximum displacement direction; When the second end electromagnet of the variable control valve is powered, hydraulic oil enters the second cavity of the variable piston through the second working position of the variable control valve, the variable piston moves to the left, and the plunger pump swash plate is driven to move from the neutral position to the negative maximum displacement direction; When the first end electromagnet and the second end electromagnet of the variable control valve are not powered, the variable control valve is in the neutral position, the variable piston drives the plunger pump swash plate to return to the zero position, and the theoretical output flow of the plunger pump is zero.

7. The integrated filtration system for a pump of claim 1, wherein, The oil outlet of the filter is also provided with an oil supplement overflow valve, a first overflow valve is arranged between the oil outlet of the filter and the first port of the plunger pump, a second overflow valve is arranged between the oil outlet of the filter and the second port of the plunger pump, the first overflow valve and the second overflow valve are the same structure and at least have a first working state and a second working state; In the first working state, the first port of the first overflow valve and the second port are one-way conducted through the one-way valve in the valve, and the hydraulic oil at the oil outlet of the filter is supplemented to the low pressure side of the main oil path of the plunger pump through the first overflow valve or the second overflow valve; When the oil pressure on the high pressure side of the main oil path of the plunger pump exceeds the fourth set value, the corresponding first overflow valve or second overflow valve is in the second working state, the second port is communicated with the first port, and the hydraulic oil on the high pressure side of the main oil path is discharged back to the tank through the oil supplement overflow valve.

8. The integrated filtration system for a pump of claim 1, wherein, It also includes a filter seat, and the filter, safety valve and electronic differential pressure valve are installed on the filter seat.

9. The integrated filtration system for a pump of claim 8, wherein, The filter seat has at least one of the following structures: a mounting surface structure matched with a plate type electronic differential pressure valve, and a mounting hole structure matched with a threaded plug-in type electronic differential pressure valve.

10. A control method of an integrated filtration system for a pump, characterized by, The control method comprises: obtaining the pressure difference between the oil inlet and the oil outlet of the filter; comparing the pressure difference with a preset value; the preset value includes a first set value and a second set value, and the first set value is smaller than the second set value; in response to the pressure difference being greater than or equal to the first set value, controlling the alarm module to issue an alarm; in response to the pressure difference being greater than or equal to the second set value, controlling the electromagnets at both ends of the variable control valve to lose power and return to the neutral position, thereby driving the plunger pump swash plate to return to the zero position, and the theoretical output flow of the plunger pump is zero; According to the pressure difference, the remaining service life of the filter element is predicted and sent to the display module to display the remaining service life of the filter element.

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