Hydraulic pump station oil supply control system and oil supply device thereof

Abstract

The invention discloses an oil supply control system of a hydraulic pump station, and relates to the technical field of hydraulic systems. The oil supply control system of the hydraulic pump station comprises an oil tank; the oil inlet end of the oil supply pump communicates with the oil tank, and the oil outlet end of the oil supply pump is connected to the oil suction end of the variable plunger pump through an oil supply path; a heat exchanger and a filter are sequentially arranged in the oil supply path and used for conducting temperature adjustment and particle filtration on oil. The oil supply path is connected with a bypass pipeline in parallel, the bypass pipeline is communicated with the oil tank through a one-way valve, the opening pressure of the one-way valve is smaller than 2 bar, and the one-way valve is used for guaranteeing the positive pressure of the oil suction end of the variable pump. The oil outlet end of the variable displacement piston pump is connected to an external hydraulic system and is provided with a high-pressure filter; the detection device is arranged in the oil supply path and used for collecting oil temperature and / or pressure signals; and the control module is connected with the detection device and the execution components and is configured to control the start and stop states of the oil supply pump, the variable displacement piston pump and the heat exchanger according to the comparison result of the detection result and a preset threshold value.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and in particular to a hydraulic pump station oil supply control system and its oil supply device. Background Art

[0002] As the power core in a hydraulic system, the oil supply structure of a hydraulic pump station has a crucial impact on the system stability. Variable piston pumps are widely used in medium and high-pressure hydraulic systems due to their advantages such as adjustable displacement, high efficiency, and fast response. However, because they have high requirements for oil suction conditions, especially being sensitive in terms of cleanliness, temperature, oil suction pressure, etc., the design of the system's oil supply path becomes a key link to ensure the normal operation of the pump unit.

[0003] In existing hydraulic systems, the oil supply path usually directly sucks oil from the oil tank by a variable piston pump or sucks oil from the oil tank through an oil suction filter. However, this path is mostly single-channel oil supply, lacking redundancy or buffer structure, and it is extremely easy for the pump inlet to form negative pressure after the oil suction filter is blocked, resulting in difficult oil suction, and in severe cases, it may cause cavitation or damage to the pump cavity. In addition, although some systems are equipped with coolers and filters, their installation positions are mostly in the system return oil path, not set at the variable pump oil suction port and the working state lacks linkage control with the system temperature and pressure, and cannot be dynamically adjusted under different operating conditions.

[0004] On the other hand, traditional hydraulic pump stations generally lack a real-time monitoring and feedback mechanism for the oil fluid state, making the control module unable to intelligently adjust the oil supply path according to the current working conditions. For example, in a low-temperature environment or under a high-pollution load, the system should have the ability to adjust the oil supply channel based on temperature and pressure signals to avoid the variable pump directly sucking high-viscosity or particle-containing oil fluid, thus affecting the system startup and operation stability.

[0005] In summary, the existing technology still has defects in aspects such as the structural integrity of the oil supply path, bypass adjustment ability, state monitoring feedback, and ensuring positive pressure for pump oil suction, and there is an urgent need to propose a hydraulic pump station oil supply control system to improve the working adaptability and operation reliability of the pump station system. Summary of the Invention

[0006] The present invention aims to at least solve the technical problems of insufficient responsiveness of the oil supply path structure, lack of state monitoring and feedback ability, and imperfect conditions for ensuring positive pressure for variable piston pump oil suction in the existing hydraulic pump station system, so as to improve the working adaptability and operation reliability of the hydraulic system under various operating conditions.

[0007] To achieve the above object, the present invention provides a hydraulic pump station oil supply control system, including: An oil tank; An oil supply pump, whose inlet end is communicated with the oil tank, and the outlet end is connected to the oil suction end of the variable piston pump through an oil supply path; A heat exchanger and a filter are sequentially arranged in the oil supply path for temperature regulation and particle filtration of the oil fluid; A bypass pipeline is connected in parallel to the oil supply path. The bypass pipeline is communicated with the fuel tank through a one-way valve. The opening pressure of the one-way valve is less than 2 bar, which is used to ensure the positive pressure at the oil suction end of the variable displacement pump; The oil outlet end of the variable displacement piston pump is connected to an external hydraulic system and is provided with a high-pressure filter; A detection device is arranged in the oil supply path for collecting oil fluid temperature and / or pressure signals; A control module is connected to the detection device and the above-mentioned actuating components, and is configured to control the start-stop states of the oil supply pump, the variable displacement piston pump and the heat exchanger according to the comparison result between the detection result and the preset threshold value.

[0008] According to the hydraulic pump station oil supply control system described in claim 1, characterized in that an electric heater is arranged in the fuel tank, the electric heater is electrically connected to the control module, and when the control module detects that the oil fluid temperature is lower than the preset temperature threshold value, it controls the electric heater to heat the oil fluid.

[0009] In some examples of the present invention, when the control module detects that the oil fluid temperature and / or pressure does not reach the preset start condition, it does not output the start signal of the variable displacement piston pump until the detection data meets the preset start condition.

[0010] In some examples of the present invention, when the control module controls the start of the variable displacement piston pump, it controls the synchronous operation of the oil supply pump and the heat exchanger to maintain the stability of the temperature and flow rate of the oil fluid.

[0011] In some examples of the present invention, the control module is a programmable logic controller, and the control program executed by it includes: collecting oil fluid state signals, comparing the signals with corresponding thresholds, and outputting control instructions to control the operation of the electric heater, the oil supply pump, the heat exchanger and the variable displacement piston pump.

[0012] Another object of the present invention is to propose a hydraulic pump station oil supply device, including: An oil supply pump; A heat exchanger, the oil inlet end of which is connected to the oil outlet end of the oil supply pump; A filter, the oil inlet end of which is connected to the oil outlet end of the heat exchanger; A variable displacement piston pump, the oil suction end of which is connected to the oil outlet end of the filter; A one-way valve, one end of which is connected to the filter and the other end of which is communicated with the fuel tank, and the opening pressure of the one-way valve is less than 2 bar; The oil outlet end of the variable displacement piston pump is sequentially connected to a high-pressure filter and a liquid supply path.

[0013] In some examples of the present invention, an electromagnetic overflow valve is provided in the liquid supply path, and the outlet of the overflow valve is communicated with the fuel tank through an oil return passage.

[0014] In some examples of the present invention, the control end of the electromagnetic overflow valve is connected to a control circuit, and the control circuit is configured to output an opening signal when the system pressure exceeds a preset threshold value, so that the overflow valve is in an open state.

[0015] In some examples of the present invention, an electric heater electrically connected to the control module is provided in the fuel tank, and the control module is configured to control the electric heater to be powered on and started when it is determined according to the temperature signal provided by the ambient temperature sensor that the ambient temperature is lower than 10°C.

[0016] In some examples of the present invention, the system or device is configured to operate in a hydraulic application environment where the temperature fluctuation is not less than 25°C and the oil contamination level is not higher than NAS 1638 level 9, so as to improve the starting stability and oil supply reliability of the equipment. Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. It has the following beneficial effects: The oil supply control system of the hydraulic pump station provided by the present invention significantly improves the system's guarantee ability for the oil suction process of the variable plunger pump, the perception ability of the operating state, and the response ability of the overall control through the collaborative design in terms of structure and control strategy, and has good technical performance and engineering applicability.

[0017] In terms of structure, the system introduces a parallel bypass pipeline and a one-way valve opened at low pressure into the traditional oil supply path. When the filter is blocked or the oil viscosity is high during cold start, the oil supply cannot smoothly pass through the main path. At this time, the bypass path can be automatically connected to provide positive pressure oil supply for the variable plunger pump, avoiding pump body suction or cavitation, thereby ensuring the operation safety of the system during the start-up stage. This passive compensation mechanism does not require additional sensors or active intervention, and has the advantages of simple structure and fast response.

[0018] In terms of the perception of the operating state, the system is provided with temperature and / or pressure detection devices for collecting key parameters in the oil supply path. These detection signals are transmitted to the control module for real-time analysis and compared with the set operating thresholds in the system, so as to trigger corresponding control actions. Through this design, the system can make dynamic judgments based on the oil state, avoid operating disorders caused by changes in external conditions, and enhance the processing ability for uncertain working conditions.

[0019] The control module serves as the logical center of the system, connecting the oil supply pump, variable piston pump, and heat exchanger to achieve interlocking control among multiple components. The start and stop of each component no longer depend on fixed logic but are controlled by real-time detection data and judgment results, enabling the oil supply process and the pump body actions to form a coordinated linkage. The overall system has higher adaptability and self-regulation ability. This closed-loop control logic significantly improves the response speed and stability of the pumping station under dynamic working conditions such as changing loads and sudden temperature differences.

[0020] Through the above structure, the hydraulic pumping station oil supply control system provided by the present invention not only solves the problem of differential pressure fluctuation at the oil suction end at the structural level but also realizes the unity of oil state perception and action interlocking control at the control level. The overall system operates more smoothly and reliably, is applicable to the safe energy supply scenarios of high-demand hydraulic equipment, and has broad engineering application prospects and promotion value. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for describing the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the hydraulic pumping station oil supply control system provided by the present invention; Figure 2 It is a control flow chart of the hydraulic pumping station oil supply control system provided by the present invention; Figure 3 It is a functional structure block diagram of the control module provided by the present invention; Figure 4 It is a schematic flow diagram of the electromagnetic overflow valve control logic provided by the present invention; Figure 5 It is a schematic structural diagram of the hydraulic pumping station oil supply device provided by the present invention;

[0023] 1. Electric heater; 2. Oil supply pump; 3. Heat exchanger; 4. Filter; 5. Pressure sensor; 6. Temperature sensor; 7. Check valve; 8. Variable piston pump; 9. Electromagnetic overflow valve. Detailed Embodiments

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention.

[0028] Figure 1 is a schematic structural diagram of the oil supply control system of the hydraulic pump station provided by the present invention; Figure 2 is a control flow chart of the oil supply control system of the hydraulic pump station provided by the present invention; Figure 3 is a functional structural block diagram of the control module provided by the present invention; Figure 4 is a schematic flow diagram of the control logic of the electromagnetic overflow valve provided by the present invention; Figure 5Schematic diagram of the oil supply device of the hydraulic pump station provided by the present invention.

[0029] Please continue to refer to Figures 1-5 As shown, the present invention provides an implementation manner of a hydraulic pump station oil supply control system, including a liquid supply component, a sensing component and a control component, constituting a control system with the ability of state detection and oil supply path adjustment.

[0030] In this system, hydraulic oil is stored in a fuel tank with an oil outlet at the bottom, and the oil supply pump 2 is connected to the downstream of the fuel tank oil outlet through a pipeline. To ensure the continuity of oil flow, the oil supply pump 2 is preferably a gear pump or an internal meshing pump with strong self-priming ability, and the bottom of the pump body is below the liquid level of the fuel tank to prevent idling and air suction. The outlet of the oil supply pump 2 is connected to a main oil supply path, which is composed of a pressure-resistant oil pipe or a metal pipe and is used to supply liquid to the variable plunger pump 8.

[0031] A heat exchanger 3 and a filter 4 are arranged in the oil supply path. The heat exchanger 3 is installed upstream of the pipeline and is used for temperature control adjustment before the oil enters the key components. According to the use environment and installation conditions, an air-cooled plate-fin type, a water-cooled shell-and-tube type or a combined heat exchange unit can be selected, and its cooling capacity can meet the requirement that the system oil maintains within a preset viscosity range during continuous operation. The filter 4 is connected in series downstream of the heat exchanger 3 and adopts a metal filter element structure with a precision of not less than 10 microns, and is equipped with a bypass valve and a pollution indicator to ensure particle interception of the oil during the initial filtration stage and extend the service life of the downstream pump body and actuators.

[0032] To avoid cavitation or air erosion of the variable plunger pump 8 when the main passage is blocked, a bypass pipeline is arranged at both ends of the filter 4, and the pipeline is connected back to the fuel tank through a check valve 7. The check valve 7 is a spring-loaded structure, and the opening pressure can be adjusted within the range of 1 to 3 bar. When the pressure in the main passage rises abnormally and the pressure difference between the front and back exceeds the set threshold, the check valve 7 automatically opens, allowing the oil to bypass the filter 4 and flow to the pump suction port, so as to maintain the positive oil suction pressure and prevent abnormal operation of the pump body.

[0033] The suction port of the variable plunger pump 8 is connected to the outlet of the filter 4, and its outlet is connected to an external load. To improve the cleanliness level of the system and protect sensitive components, a high-pressure filter 4 is installed at the pump outlet, and the filter element precision can reach 3 microns for final cleaning treatment. The entire pump station pipeline and the pump body are hermetically connected by means of flanges, threads or welding to ensure the airtightness and pressure resistance of the system.

[0034] The system is configured with a temperature sensor 6 and a pressure sensor 5 to monitor the oil temperature at the outlet of the heat exchanger 3 and the oil suction pressure at the inlet of the variable pump respectively. The sensor signals are sent to the control module via a shielded cable. The control module uses a programmable logic controller, and its program includes parameter acquisition, threshold comparison, logical judgment, and output actions. When the oil temperature does not reach the preset start condition (such as below 30 °C) or the oil suction pressure is lower than the minimum positive suction pressure, the control module does not output a variable pump start signal and only keeps the oil supply pump 2 and the heat exchanger 3 running. After the detected data meets the conditions, the control module starts the variable pump and keeps the heat exchanger 3 and the oil supply pump 2 running synchronously to achieve a smooth transition of temperature and pressure.

[0035] The control module can set the judgment period according to the sensor acquisition frequency, and the system supports state switching under continuous and intermittent working conditions. In the whole control process, all actions are based on the detected parameters, and the system operation does not require manual intervention, with a high level of intelligence.

[0036] This implementation method improves the self-regulating ability of the oil supply path of the pump station and the safety during the start-up stage of the variable pump through structural optimization and logical coordination, can adapt to the operating environment with large temperature fluctuations and high oil pollution risks, and has good versatility and practical value.

[0037] Please refer to Figure 1 、 2 On the basis of the basic structure of the above-mentioned oil supply control system of the hydraulic pump station, in order to further improve the start-up performance and adaptability of the system in a low-temperature environment, this embodiment introduces an electric heater 1 to form a low-temperature auxiliary heating subsystem, and realizes linkage control in combination with a temperature detection device and a control module.

[0038] A group of electric heaters 1 are installed at the bottom of the fuel tank near the oil outlet. The electric heater 1 is a tubular resistance type oil heating element, fixed on the fuel tank wall or an internal support, and the heating surface is directly immersed in the oil. To ensure uniform oil temperature rise and prevent local overheating, the shell of the electric heater 1 is made of stainless steel or aluminum alloy material and has a temperature control protection layer to prevent dry burning during heating. The power of the electric heater 1 can be determined according to the fuel tank capacity. A typical configuration is to configure a heating power of 1–2 kW per 100 liters of oil capacity, and the power supply input is 220 V or 380 V industrial alternating current, which is powered by the control module or an independent electric control system.

[0039] The judgment conditions before the electric heater 1 is powered on are completed jointly by the temperature detection device and the control module. The temperature sensor 6 is installed in the middle of the oil tank wall or 5 - 10 cm below the oil surface for real-time collection of the static temperature of the oil. The output signal of the sensor is an analog voltage or a digital signal, which is input into the control module after signal conditioning. There is a lower temperature threshold inside the control module, and this value can be set according to different hydraulic oil varieties and ambient temperatures, generally set between 10°C and 25°C. In this embodiment, the default temperature threshold is 15°C. When the oil temperature is detected to be lower than this value before the system starts, the control module controls the electric heater 1 to be powered on.

[0040] The control module program has a temperature closed-loop heating-up logic. After the heater is powered on, the temperature sensor 6 collects temperature data every 5 seconds and uploads it to the module, and the module continuously compares the current temperature with the set value. When the temperature reaches or exceeds the target threshold, the module turns off the electric heater 1 and records the status flag of "oil heating completed". When the system subsequently judges whether the variable displacement pump 8 can be started, it will first retrieve this flag bit to ensure that the oil has met the starting viscosity condition, thereby avoiding cavitation or starting load overlimit caused by the variable pump operating in a high-viscosity and low-temperature state.

[0041] To improve the system safety, an independent overheat protection device is set in the heater circuit. When the temperature sensor 6 fails to sample correctly due to a fault or the local temperature of the heater exceeds 95°C (much higher than the system-set starting value), the overheat protector forces a power cut. This mechanism can prevent overheat damage caused by abnormal control module programs or out-of-control external control signals.

[0042] Considering the temperature difference changes in different environments or seasons, the heating function can provide three operating modes through the control module: automatic, forced heating, and manual disabling. In the automatic mode, the module completely judges whether to power on according to the temperature threshold; in the forced heating mode, regardless of the temperature status, the heater can be manually turned on by the operator, which is suitable for extremely cold starting environments; in the disabling mode, the heating circuit is disconnected, and the system completes the oil temperature management through external heating or natural temperature rise.

[0043] In this embodiment, the electric heater 1 can be single-stage power control or multi-stage hierarchical control structure. For example, two groups of 1.5 kW heating elements are configured, which are respectively controlled by two relays. When the oil temperature is lower than 10°C, all power segments are started, and when the temperature rises to 12°C, it automatically switches to single-stage heat preservation control to reduce energy consumption and avoid the risk of local aging of the oil caused by too fast temperature rise.

[0044] To achieve structural diversity, various types of heaters can be selected, including but not limited to: electric heating rods, electric heating tubes, flexible heating films, externally attached constant temperature plates for fuel tanks, oil circulation heating pumps, etc. The installation methods can be in-tank insertion type, flange connection type, or externally attached type to the tank body. For the selection of heater power and control mode, it is preferably configured jointly based on the start-up characteristics of the hydraulic system and the local minimum ambient temperature curve.

[0045] Combined with the above structure, this embodiment realizes the closed-loop regulation and control of the hydraulic oil temperature, solves the technical problems such as difficult oil suction and difficult start-up of the variable pump due to too high oil viscosity in the hydraulic system in cold environments, ensures that the start-stop conditions of the variable pump have thermal stability support, and significantly improves the stability, reliability, and long-term operation efficiency of the hydraulic pump station system in winter or environments with drastic day-night temperature differences.

[0046] Please refer to Figure 2 、 3 , the present invention further combines the working characteristics of the variable displacement piston pump 8 and the dynamic operation requirements of the hydraulic system to construct a logic control mechanism that decides whether to allow the main pump to start after judging based on the oil state data. This mechanism realizes the delay control of the variable pump start-up behavior, ensures that it only outputs a start command when the temperature and / or pressure meet the preset start conditions, and prevents the pump body from operating under adverse conditions.

[0047] In this embodiment, the temperature and pressure are respectively collected by the temperature sensor 6 arranged at the outlet pipe section of the heat exchanger 3 and the pressure sensor 5 between the filter 4 and the oil suction port of the variable pump. The above two sensors transmit the signals to the control module in real time through shielded cables. The control module is a programmable logic controller (PLC), and a logic program block for judging the start conditions of the variable pump is provided inside.

[0048] In the control logic, two key parameter thresholds are set: one is the lower limit value of the oil temperature, which is default set to 30 °C; the other is the lower limit value of the pressure at the oil suction port of the pump, which is default set to 1.8 bar. When the system is in a standby state, the control program will continuously collect the data of the temperature and pressure sensors 5 and perform logical judgment with a sampling period of every 5 seconds. If any parameter does not reach the set threshold, the control module will not output the start signal of the variable pump, and at the same time maintain the operating states of the oil supply pump 2 and the heat exchanger 3 to ensure that the oil continues to heat up, relieve pressure or maintain the circulation state.

[0049] The specific judgment logic is: when the temperature ≥ 30 °C and the pressure ≥ 1.8 bar, the control module issues a start signal for the variable pump to allow the main pump to be powered on and operate; otherwise, the control module will continuously maintain the disabled state of the main pump and issue a "standby" or "low temperature / low pressure lock" state signal, which can be reflected in the human-machine interface, LED indicator light, or remote monitoring terminal.

[0050] To avoid frequent jitter or false triggering, the system introduces a judgment hysteresis protection logic. When two parameters simultaneously meet the start conditions, the program sets a minimum holding time, with a typical value of 15 seconds. If the conditions are continuously met within this time period, the variable pump can be activated; otherwise, the state remains in the "start prohibited" state. This logic can prevent misjudgment of short-term oil temperature rise or system false triggering caused by pressure pulsation, thereby improving control stability.

[0051] To enhance adaptability, this implementation mode supports temperature-pressure combined judgment curve control, that is, a temperature-pressure coupling parameter table is preset according to different seasons or geographical environments. For example, in cold regions, the temperature start threshold can be reduced to 25°C, and at the same time, the pressure condition can be relaxed to 1.5 bar; in high-altitude and low-pressure situations, the parameter ratio can be adjusted in reverse to make the system have stronger environmental adaptability. The above parameters can be configured in real time through the PLC local menu or the host computer remote setting module.

[0052] The system control module has a dual logic architecture of local control and remote synchronization. In the local control mode, the user can set or adjust the threshold through the touch screen, knob or DIP switch; the remote mode synchronizes parameters with the main control system or industrial cloud platform through communication interfaces such as MODBUS, CANopen or Ethernet, which is suitable for the centralized monitoring system of distributed hydraulic stations. The module provides a permission management and anti-misoperation mechanism, and only authorized users can make adjustments in a safe state.

[0053] To improve system safety, this embodiment introduces a fault detection and fault recovery mechanism. If the control module detects signal loss, mutation or extreme abnormality (such as the pressure suddenly drops to 0 bar or the temperature fluctuates more than 10°C / second) within three consecutive sampling periods, the system alarm state is triggered. At this time, the control module no longer performs the normal judgment logic, but enters the "safe waiting mode", and sends a communication fault prompt to the system main control or maintenance personnel. After receiving valid data again, the system re-enters the normal judgment process.

[0054] In terms of structural linkage, the control module can also form a logic linkage with the start relay of the oil supply pump 2 and the fan relay of the heat exchanger 3 through digital output signals. When the variable pump is not started, the oil supply pump 2 and the cooler enter the pre-operation mode, and the flow rate remains at the basic maintenance level; when the variable pump is successfully started, the oil supply pump 2 automatically switches to rated speed operation, and at the same time the cooler adjusts the wind speed to adapt to the increased flow rate to ensure system temperature stability.

[0055] In this implementation mode, all judgment logics, parameter settings, and control responses can be exported to a USB flash drive or a remote server through a configuration file for multi-machine deployment parameter synchronization, maintenance diagnosis, and software upgrade support.

[0056] In summary, through the above combined temperature and pressure judgment and control mechanism, the present embodiment realizes the delayed start control of the variable displacement pump 8, ensuring that forced operation does not occur in any scenario where the oil fluid state may be unstable, significantly reducing the risks such as pump body idling, pressure fluctuations, and abnormal starting loads, and having high safety, versatility, and portability, especially suitable for hydraulic pump station systems in scenarios such as severe cold, remote locations, high-frequency start-stop, or unattended operation.

[0057] Please refer to Figure 2 、 3 , in this embodiment, the operation state of the peripheral subsystems after the start-up behavior of the variable pump is further coordinated and controlled to ensure that the oil supply source and the heat exchange system can respond in a timely manner and operate synchronously during the start-up moment and the stable operation process of the variable pump, thereby preventing problems such as lagging oil supply and out-of-control thermal stability.

[0058] In terms of structure, the oil supply pump 2 is the primary power source for the entire oil supply path, and its operating state has a direct impact on maintaining the pressure at the suction end of the variable pump. The heat exchanger 3, as a temperature control device, its operating state determines whether the oil viscosity is suitable for the operation of the high-pressure pump. If the oil supply pump 2 does not operate sufficiently when the variable pump starts and the air cooling of the heat exchanger 3 is not enabled in a timely manner, it will lead to unstable pressure at the suction end or fluctuations in the oil temperature, and then cause adverse consequences such as starting oscillations and flow rate mutations.

[0059] To avoid the occurrence of the above phenomena, the control module binds the start-up command of the variable pump with the start-stop signal of the oil supply pump 2 and the start-stop signal of the fan of the heat exchanger 3. In the control logic, the "variable pump start trigger point" is set as the entry point of the linkage condition. When this condition is met, the control module synchronously outputs three concurrent signals: First, drive the main contactor of the variable pump to close or turn on the PWM speed regulation signal; Second, activate the operating relay of the oil supply pump 2 to ensure that it runs at least 2 to 5 seconds (configurable) in advance before the variable pump operates; Third, start the fan of the heat exchanger 3 or the water-cooling flow valve to ensure that the heat exchange cycle enters the working state simultaneously.

[0060] To improve the response accuracy and flexibility of the system, the synchronization logic in the control module uses a dual-period structure of the "pre-synchronization stage before the variable pump starts" and the "thermal insulation stage after the variable pump starts". The pre-synchronization stage is used to make the oil supply pump 2 reach a stable speed and the fan of the heat exchanger 3 enter the effective heat exchange area; the thermal insulation stage keeps the oil supply and cooling equipment running for a certain period of time (default setting: 30 seconds to 2 minutes) after the variable pump starts to prevent heat exchange lag caused by oil temperature rise in the initial stage of high load.

[0061] Under the conditions of complex application scenarios and drastic load fluctuations, the synchronous start of the oil supply pump 2 and the heat exchanger 3 can be dynamically adjusted according to the feedback of the variable pump working conditions. A "variable pump load level discrimination logic" is set in the control module. By reading the variable pump displacement feedback signal, the main current or the actuator back pressure data, the pump operating state is divided into three levels: "light load, medium load, and heavy load". If the system identifies a "heavy load start", the pre-operation duration of the oil supply pump 2 is extended to more than 10 seconds before the variable pump is powered on, and the heat exchanger 3 is switched to the forced cooling mode.

[0062] In addition, to balance the system energy efficiency and adaptability, during the stable operation of the variable pump, the system allows the control module to dynamically adjust the operation mode of the heat exchanger 3 according to the current oil temperature, load pressure and operation time. Typical strategies include intermittent fan control, variable frequency cooling speed regulation or intermittent flow control of the cooling circuit, etc., which can not only meet the heat exchange requirements, but also reduce the redundant operation and energy consumption of the equipment.

[0063] Aiming at the common "control delay" problem in industrial applications, this embodiment configures a high-speed logic output module (with a response speed higher than 10ms) and a feed-forward control strategy, buffers the variable pump start signal in advance by 10ms–20ms and outputs it synchronously, ensuring that the associated equipment enters the operating state before or synchronously, and forming a complete oil pressure and thermal control collaborative closed loop during the system startup phase.

[0064] The control program of this embodiment supports local and remote debugging, and the parameter settings can be carried out on the touch screen HMI, industrial upper computer or remote management platform. All delays, lags, and operation durations in the synchronous control logic can be flexibly configured to improve the adaptability of the system under multi-region deployment conditions. The program can also be integrated with the master station logic to accept the startup authorization instruction of the upper system and achieve multi-pump synchronous coordination of the integrated system.

[0065] In terms of preventing control failures, the control module is equipped with a linkage control failure detection mechanism. For example, when the variable pump start signal has been sent, but the current signal of the oil supply pump 2 or the fan feedback signal of the heat exchanger 3 is not detected within the preset time window, the startup failure protection logic is triggered, the variable pump circuit is automatically cut off, and a linkage failure alarm is issued to prevent the main pump from idling or running at high temperature in case of unsuccessful linkage, ensuring the safety of the system.

[0066] In summary, this embodiment constructs a system startup mode of "main pump behavior drive, peripheral equipment collaborative response" by linking the startup behavior of the variable pump with the start-stop logic of the oil supply pump 2 and the heat exchanger 3, significantly improving the operating stability of the hydraulic pump station at the moment of startup and the overall oil supply and thermal control coordination ability, especially suitable for complex working condition scenarios with high-frequency start-stop, heavy load start and high requirements for oil temperature control, and having extremely high engineering practicability and on-site deployment value.

[0067] Please refer to Figure 2, 3 , in a possible implementation, the control module is a programmable logic controller (PLC). The PLC executes operations of collecting oil fluid state signals, comparing the collected signals with preset thresholds, and outputting control instructions according to the comparison results in sequence by configuring a control program, so as to control the electric heater 1, the oil supply pump 2, the heat exchanger 3, and the variable piston pump 8. The PLC is connected to the temperature sensor 6 and the pressure sensor 5 arranged in the oil supply path, and the analog signals output by the sensors are input into the analog input port of the PLC. The PLC collects various oil fluid parameters at a set period and compares the collected real-time data with the threshold parameters stored in the program. When it is detected that the oil fluid temperature is lower than the set starting temperature threshold, the PLC outputs a heating control signal through the digital output port to drive the contactor to be energized and connected to the electric heater 1, prompting it to heat the oil fluid. When the oil fluid temperature reaches the set temperature value and the oil fluid pressure also reaches the starting pressure threshold required by the system, the PLC sequentially outputs starting signals for the oil supply pump 2, the heat exchanger 3, and the variable piston pump 8 according to the program logic sequence, controlling each device to start running synchronously according to the logic to achieve closed-loop oil supply in the oil supply path of the hydraulic system.

[0068] The PLC control logic is written based on industrial control standards, can be implemented in the form of ladder diagrams, structured text, or function block diagrams, and has functions such as power-off retention, operation monitoring, and abnormal alarm. It can monitor and feedback the system operation state in real time to ensure the safe and stable operation of the system. This structure realizes the coordinated linkage control of multiple components through a unified programmable control platform, effectively improves the automation degree, response speed, and regulation accuracy of the hydraulic pump station operation, avoids system malfunction or abnormal energy consumption caused by oil fluid state fluctuations, and helps to improve the overall operation efficiency and service life of the equipment.

[0069] Among them, taking the startup process of the hydraulic pump station in a low-temperature environment in winter as an example, when the ambient temperature is lower than 0 °C, the viscosity of the hydraulic oil in the fuel tank increases significantly, which easily causes the oil supply pump 2 to run idly and the variable piston pump 8 to have difficulty in sucking oil, thus affecting the establishment of system pressure and the response of the actuator. In this case, after the system is powered on, the PLC first reads the real-time oil fluid temperature signal transmitted back by the temperature sensor 6 and judges whether it is lower than the set temperature threshold (such as 40 °C). If the startup condition is not met, the PLC outputs a control instruction to drive the electric heater 1 to work and continuously monitors the change process of the oil fluid temperature during the heating period. When the detected temperature reaches the set threshold, the system enters the next stage. The PLC sequentially controls the oil supply pump 2 to start to ensure a stable oil supply basis at the oil suction end of the variable piston pump 8; then the fan of the heat exchanger 3 starts to maintain the dynamic balance of the circulating oil fluid temperature. Finally, on the premise of ensuring that both the temperature and pressure meet the conditions, the PLC starts the variable piston pump 8, and the system completes a safe and reliable startup process.

[0070] Taking the sudden increase in system pressure during operation as an example, when the system pressure exceeds the upper limit of safe operation (such as 25 bar) due to abnormal load or sudden blockage of the actuator, the pressure sensor 5 immediately feeds back the signal to the PLC. The PLC determines this state as an "overpressure condition" according to the alarm threshold set in the program, immediately outputs a control signal to shut down the variable displacement pump 8, and simultaneously controls the electromagnetic relief valve 9 to open, so that the system oil returns to the oil tank through the oil return path, quickly releasing the excess pressure to prevent damage to the pump body or pipeline. This control strategy can effectively ensure the safety of the pump station under high-load fluctuation conditions, reflecting the integrity and industrial adaptability of the control logic.

[0071] In different application environments, the control module can be replaced by other industrial control units with equivalent logical operation and control capabilities, such as embedded controllers, industrial single-chip microcomputer systems, or remotely controlled centrally through the SCADA platform. The sensor inputs can also be configured with expansion modules according to requirements, including but not limited to oil flow sensors, viscosity sensors, environmental temperature and humidity sensors, etc., to construct a more complete perception layer information. In addition, the electric heater 1 can select models with rapid heating ability or explosion-proof ability; the supply pump 2 and the variable displacement pump 8 can adopt models with soft start or variable frequency control functions to improve the adjustment flexibility and reduce system shock. For further enhancement of the control strategy, an expert rule judgment module, an adaptive control logic or a prediction algorithm based on neural network can also be integrated into the PLC to achieve dynamic adjustment and intelligent diagnosis under complex working conditions.

[0072] Please refer to Figure 5 , in a possible implementation, a hydraulic pump station oil supply device includes key components such as a supply pump 2, a heat exchanger 3, a filter 4, a variable displacement pump 8, a check valve 7, and a high-pressure filter 4. In the system design, the supply pump 2 is arranged between the oil tank and the oil supply path, and its function is to suck hydraulic oil from the oil tank and provide the initial flow rate and basic pressure to provide stable oil source support for the normal operation of subsequent components. The outlet end of the supply pump 2 is connected to the inlet end of the heat exchanger 3 to adjust the temperature of the sucked oil. Under different environments, the heat exchanger 3 can play a dual role of cooling or preheating, so as to control the oil temperature within an appropriate range to prevent the oil viscosity from being unbalanced or the system response from being sluggish due to abnormal temperature.

[0073] The oil outlet end of the heat exchanger 3 is further connected to the oil inlet end of the filter 4. The filter 4 is used to remove solid impurities such as metal particles and rubber debris entrained in the oil, ensuring that the flowing hydraulic oil meets the cleaning standard before entering high-precision components. In this embodiment, a high-efficiency filter 4 with a multi-stage filter element structure is preferably used, and it is recommended that its filtration accuracy is not less than 10 μm to ensure the operating stability and service life of the downstream variable piston pump 8. The oil outlet end of the filter 4 is directly connected to the oil suction end of the variable piston pump 8. The variable piston pump 8 adopts a mechanical drive mode, often connected by a motor and a coupling. The internal piston assembly pressurizes and outputs the inhaled low-pressure oil through reciprocating motion to provide the required working pressure for the hydraulic actuator system.

[0074] To improve the adaptability of the system under abnormal conditions, a bypass pipeline is arranged in parallel between the filter 4 and the fuel tank, and a check valve 7 with an opening pressure less than 2 bar is configured in this pipeline. When the system is in a cold start state, the oil viscosity is high, or the resistance of the filter 4 suddenly increases, the check valve 7 can be automatically opened to allow some oil to bypass the main supply path and directly return to the fuel tank, thus effectively alleviating the risk of increased pump body load, cavitation phenomenon, and even system startup failure caused by local overpressure. This design significantly enhances the stability and fault tolerance of the oil supply system, especially suitable for working conditions with severe ambient temperature fluctuations or uncertain oil pollution levels.

[0075] A high-pressure filter 4 is further arranged at the oil outlet end of the variable piston pump 8 to perform secondary purification on the high-pressure side oil, prevent particulate impurities from entering sensitive actuator components under pressure, and ensure the accuracy and long-term reliability of the hydraulic actuator system. The high-pressure filter 4 is preferably equipped with a filter element assembly with a pressure resistance rating not less than the maximum working pressure, and it is recommended to configure a differential pressure detection port at the same time to monitor the filter element clogging state and trigger a maintenance reminder.

[0076] To further improve the operating safety and system integration, the device can also optimize the start-stop logic in combination with an automatic control module. The start of the variable piston pump 8 should depend on the stable operation of the front-end oil supply pump 2. It is recommended to set "oil circuit establishment confirmation" and "system pressure up to standard" as the pump start conditions in the PLC control program to avoid abnormal actuator actions caused by no-load dry running or pressure fluctuations. The liquid supply path after the high-pressure filter 4 should be designed as a closed-loop or branch system interface and connected to the bypass return oil pipeline through a ball valve to facilitate system maintenance or emergency pressure relief.

[0077] In specific applications, if the pump station is located in the outdoor environment in winter, the oil temperature is as low as -10°C at the initial startup. The high-viscosity oil is likely to form a significant pressure difference before entering the filter 4. At this time, the check valve 7 can respond quickly and provide a temporary pressure relief channel to avoid unnecessary mechanical stress caused by the rigid startup of the equipment. Similarly, if the filter element is blocked due to oil contamination during operation and the system pressure difference increases, this bypass circuit will also be automatically activated to provide temporary unloading for the filtration system, reducing the maintenance frequency and failure rate.

[0078] It should be noted that the heat exchanger 3 can be selected as an air-cooled fin type or a water-cooled plate type according to the space layout and heat dissipation requirements. The filter 4 can also introduce an online monitoring sensor to realize the functions of filter element life prediction and remote alarm. The variable plunger pump 8 can adopt a built-in electronic control variable mechanism to realize the dynamic adjustment of the output flow and pressure; the check valve 7 can also be replaced with a multi-functional valve body with slow opening or hydraulic control functions to improve its stability in high-frequency cycles.

[0079] Among them, the overall system adopts a modular design concept. Each component is connected through a standardized hydraulic interface, and the installation sequence follows the process path of "oil supply pump 2 - heat exchanger 3 - filter 4 - variable pump - high-pressure filter 4 - liquid supply path". To ensure the long-term stable operation of the equipment, it is recommended to configure drain pipes, maintenance bypasses, and fault indication systems at each main node. The control module integrates electrical interlocks, status feedback, and a manual operation interface for easy on-site debugging and maintenance.

[0080] To sum up, the oil supply device of this hydraulic pump station constructs a complete system closed-loop from aspects such as oil temperature control, cleanliness guarantee, pressure management to fault protection. The technology is disclosed in detail, the path is clear, the support is comprehensive, and it has rich deformable configurations. Those skilled in the art in the technical field can independently implement this device based on the above description without creative experimental input, and it has sufficient industrial feasibility. Moreover, it constitutes a significant improvement compared with the existing technology in terms of the stability of the oil supply path, the compactness of the structure, and the safety of the system.

[0081] Please refer to Figure 1 、 4 In a possible implementation manner, an electromagnetic relief valve 9 is provided in the liquid supply path of an oil supply device of a hydraulic pump station to regulate the system pressure. The oil inlet end of the electromagnetic relief valve 9 receives the high-pressure oil from the outlet end of the variable plunger pump 8, and its outlet is connected to the oil tank through an oil return passage to construct a controllable pressure unloading channel.

[0082] In this structure, the electromagnetic overflow valve 9 is of a normally closed type. When the hydraulic system is operating normally, the electromagnetic overflow valve 9 is in a closed state, allowing high-pressure oil to continuously supply the external hydraulic actuator. When the system pressure exceeds the preset pressure threshold (e.g., 25 bar) due to sudden load changes, increased fluid resistance, or end blockage, the control module (such as a PLC or relay logic controller) detects the abnormal signal and immediately issues an energization command to drive the electromagnetic overflow valve 9 to open, enabling some of the high-pressure oil to quickly transfer to the return oil passage and flow into the fuel tank, thereby achieving rapid decompression and preventing component damage or pipeline leakage caused by overpressure in the system.

[0083] To enhance the flexibility and safety of control, the control end of the electromagnetic overflow valve 9 can receive signal inputs from the pressure sensor 5 and / or the temperature sensor 6, supporting multiple trigger condition combinations. In practical applications, in addition to responding to abnormal pressure, the valve can also be configured to automatically open when the oil temperature exceeds the set threshold (such as 70 °C), which is used to assist in unloading the heat load of the pump body and prevent high temperature from damaging the system seals or reducing the oil performance. In addition, a timed opening logic can be set when the system operation cycle is long, which is used to periodically release the residual pressure or impurity oil, improving the system stability and the quality of oil circulation.

[0084] In the system control logic, the action state of the electromagnetic overflow valve 9 can be transmitted to the control module through the feedback interface, forming a confirmation closed-loop of the "open - closed" state, which is conducive to the control system to make subsequent responses to the overflow behavior, such as synchronously reducing the pump speed, pausing the operation of the actuator, etc. This closed-loop feedback mechanism can improve the intelligent level of the entire system and enhance the real-time processing ability of sudden anomalies.

[0085] To ensure the reliability of this overflow device under variable working conditions, the electromagnetic overflow valve 9 is preferably selected with a damping slow-opening structure to avoid the impact flow caused by instantaneous high-pressure opening. In addition, its return oil passage should be designed as a low-pressure return path with a moderate diameter, and the flow capacity should be at least half of the main oil supply passage to ensure sufficient unloading capacity during pressure release. When necessary, a buffer tank or a pressure stabilizing cavity can be configured at the return oil port to absorb the impact pressure, reduce vibration and noise, and extend the service life of the return oil components.

[0086] The structure of the electromagnetic overflow valve 9 and its control logic described in this embodiment not only have the basic pressure protection function, but also construct a highly automated safety control loop through multi-signal fusion and logic linkage. This solution is particularly suitable for hydraulic systems with high requirements for oil supply stability and safety redundancy, such as high-frequency regulation, high-pressure execution, or precision operation scenarios. Those skilled in the art can complete the construction and deployment of this device in accordance with the above structure description combined with general hydraulic control equipment, with clear industrial feasibility and good system compatibility.

[0087] Please refer to Figure 3 、4 , in a possible implementation, an electromagnetic relief valve 9 is provided in a hydraulic pump station oil supply device for releasing excess pressure when the system pressure abnormally increases. To achieve this function, the control end of the electromagnetic relief valve 9 is connected to a control circuit, which can monitor the system pressure in real time and output an opening signal when the pressure exceeds a preset safety threshold, causing the electromagnetic relief valve 9 to quickly open, thereby guiding the high-pressure oil to flow back to the oil tank through the oil return passage, reducing the system pressure, and ensuring the stable operation of the hydraulic system.

[0088] The basic structure of the control circuit includes three parts: a pressure sensor 5, a signal processing module, and an execution control module. Among them, the pressure sensor 5 is arranged in the high-pressure output pipeline of the variable displacement piston pump 8 for collecting the current system pressure in real time. The collected analog signal is first subjected to digital conversion and filtering processing by the signal processing module and compared with the preset pressure threshold in real time. This threshold can be set to 25 bar, 30 bar, or other values according to the system working conditions to adapt to different application requirements. When the processing result determines that the current pressure exceeds the safe range, the signal processing module immediately outputs a trigger signal to the execution control module.

[0089] The execution control module can be a PLC, an embedded microcontroller, or a relay-based control circuit. After receiving the trigger signal, this module immediately outputs a drive voltage signal (such as 24V DC) to the control end of the electromagnetic relief valve 9, causing the relief valve to switch from the normally closed state to the open state. At this time, the valve core moves to open, and part of the high-pressure oil in the main liquid supply path will immediately transfer to the oil return path and be guided into the oil tank to complete the pressure unloading process. Through this rapid release loop, timely intervention can be carried out before the internal pressure of the system reaches the dangerous critical value, preventing problems such as pump body overload, pipeline bursting, or incorrect operation of the actuator.

[0090] To improve the stability and anti-interference ability of the control system, the control circuit can further be provided with a state feedback channel. When the electromagnetic relief valve 9 operates, its feedback interface returns the "open state" signal to the control system to achieve closed-loop confirmation. This feedback mechanism not only helps with fault identification but also enables the control module to adjust subsequent logic according to the actual operation results, such as reducing the pump speed, delaying the actuator response, or entering the safe mode operation, thereby enhancing the intelligent response ability and fault tolerance characteristics of the entire system.

[0091] It should be noted that in actual working conditions, pressure fluctuations are often accompanied by short-time shocks or periodic peaks. To prevent the system from frequently triggering the opening of the relief valve due to short-term fluctuations, a "hysteresis fallback control mechanism" is recommended for this control circuit. That is to say, once the valve body is opened, it is necessary to wait until the pressure drops below another set value (such as 22 bar) and remains stable for a certain period of time (such as 3 - 5 seconds) before closing the solenoid valve. This logic can significantly reduce system oscillations and improve the smoothness of pressure control.

[0092] In addition, other sensor signals can also be connected to the control circuit to achieve a higher-level multi-condition linkage control. For example, when the system pressure approaches the threshold and the oil temperature exceeds the set upper limit (such as 70 °C), the control circuit can determine this combined state as "combined high-temperature and high-pressure anomaly" and preferentially trigger the overflow action; or after a fixed operation cycle of the equipment (such as every 4 hours), a short-term overflow operation is triggered regularly to eliminate the residual pressure in the system and remove residual particulate contamination. This type of multi-dimensional signal combined judgment mechanism makes the control behavior more flexible and better suits the operation requirements of complex working conditions.

[0093] In terms of electrical configuration, it is recommended that the control circuit be connected to an independent 24V DC control power supply of the pump station, and be equipped with short-circuit protection, status indicators, and manual test buttons, which are convenient for maintenance personnel to perform on-off detection and action verification in the non-operating state. To enhance the fault tolerance ability when the solenoid valve fails, the system can also be provided with mechanical limits or manual bypass valve bodies to ensure that the overflow state can still be manually controlled in the event of the main circuit failure, achieving basic safety protection.

[0094] Through the above structural and logical designs, the overflow control system constructed by this implementation method not only realizes the automatic recognition and rapid response to the overpressure state of the system, but also combines multiple control means such as feedback confirmation, hysteresis closing, condition linkage, and manual intervention to form a multi-level and full-link safety regulation mechanism. This design effectively improves the reliability and controllability of the hydraulic pump station under continuous operation, high-pressure fluctuations, or complex loads, and at the same time improves the overall system intelligence level.

[0095] Please refer to Figure 2 、 3 In a possible implementation method, an electric heater 1 is provided in a hydraulic pump station oil supply control system. The electric heater 1 is installed in the fuel tank and is electrically connected to the control module, and is used to heat the hydraulic oil when the ambient temperature is relatively low. The control module is connected to the ambient temperature sensor 6 and is configured to automatically control the electric heater 1 to be powered on and started when the ambient temperature is lower than the preset threshold, so as to ensure that the system has good starting stability in a low-temperature environment.

[0096] In traditional hydraulic pump station applications, there is generally a lack of a real-time response mechanism to environmental temperature changes. The method of manually starting the heater at regular intervals is often used for preheating. This method has defects such as energy consumption waste, response lag, and overheating out of control, and is not suitable for unattended or night automatic operation environments. To address such problems, this embodiment improves the intelligent adaptation ability and startup safety of the pump station system in low-temperature environments by constructing a technical solution of "ambient temperature sensing + automatic heater control + safety protection closed-loop".

[0097] In terms of structural configuration, the electric heater 1 is preferably an immersion electric heating tube, a flexible heating film, or an oil-resistant PTC heating element, and is installed in the lower area of the fuel tank by means of threads or clamps to ensure that its heating area covers the main oil volume. To improve the thermal efficiency, it is recommended that the electric heater 1 be in close contact with the inner wall of the fuel tank or a metal heat conduction plate to avoid local overheating and dry burning. Its rated power is set according to the fuel tank capacity, and a common design is 24kW for fuel tank heating applications of 500 - 800L. The power supply end of the electric heater 1 is connected to the output end of the control module and is controlled by a program logic signal.

[0098] The ambient temperature sensor 6 is set outside the pump station control cabinet or on the fuel tank shell to ensure that it is not affected by the internal oil temperature and thus accurately reflects the environmental conditions. The control module receives the analog signal collected by the sensor and sets a temperature threshold, such as 10°C, in the internal program. When the external ambient temperature is lower than this set value, the control module outputs a control signal to drive the heater to operate energized, and the oil temperature gradually rises. To prevent the heater from starting and stopping frequently, a hysteresis parameter is set in the control logic. For example, the heater is only commanded to turn off when the ambient temperature rises above 13°C and lasts for more than 3 minutes, so as to avoid ineffective switching caused by temperature fluctuations.

[0099] At the safety control level, an independent temperature control protector (such as a mechanical temperature control switch or a temperature fuse) is configured in the heater circuit to forcibly cut off the power when the oil or the surface temperature of the heater exceeds the safety upper limit (such as 85°C). A maximum continuous heating time threshold, such as 20 minutes, can be set in the control module. If the oil temperature rise does not reach the target after this time, a fault alarm will be triggered to prompt the user to check the oil condition or the heater operation status.

[0100] To enhance the stability of the control logic, this embodiment also introduces a linkage start-stop strategy, that is, the heater is only allowed to start when the pump station system is in the "not running" state (the variable displacement pump 8 and the supply pump 2 are not started), to prevent local expansion or system interference caused by oil temperature difference changes during operation. After heating is completed, the control module can issue a pump start command to allow the supply pump 2 and the variable displacement pump 8 to start after confirming that both the oil temperature and the ambient temperature meet the set requirements, ensuring that the system operates under stable hot conditions and constructing a complete working closed-loop consisting of "heating - confirmation - start".

[0101] Both the temperature threshold and the hysteresis parameter of this control strategy can be set through the control interface, and it is applicable to different regional climate conditions or operating frequency scenarios. For example, under the outdoor operation conditions in the north, the starting temperature can be set to 15°C; while in an environment with low-frequency start-stop and sufficient sunlight, it can be reduced to 5-8°C to reduce energy consumption. The control module can be connected to the remote monitoring platform through the extended IO port to remotely view the heating status and issue remote start-stop commands.

[0102] This heating control system does not need to modify the main liquid supply path. The control module can be programmed and implemented based on the existing PLC platform, which is applicable to the design of new systems and the transformation of old systems, and has good engineering compatibility. All its hardware components are industrial standard products, which are convenient to purchase and simple to maintain, and have practical feasibility in deploying in pumping stations of different scales.

[0103] In summary, in this embodiment, by controlling the electric heater 1 based on the ambient temperature signal, the preheating function of the hydraulic oil under low-temperature conditions is realized, significantly improving the cold start ability of the hydraulic pumping station. This solution has a simple structure, clear control logic, and a perfect safety mechanism, is applicable to a variety of industrial environments, has clear industrial feasibility, and can be constructed and operated by ordinary technical personnel in the technical field without additional creative labor.

[0104] Please refer to Figure 1 、 2 , in a possible implementation, a hydraulic pumping station oil supply control system or a hydraulic pumping station oil supply device is configured to operate in a hydraulic application environment where the temperature fluctuation is not less than 25°C and the oil contamination degree is not higher than NAS 1638 level 9. Through a series of structural configurations and control mechanisms, this system ensures that the equipment can still achieve stable start-up and continuous oil supply under complex and variable working conditions, thereby improving the overall operation reliability.

[0105] For the operating condition of "temperature fluctuation not less than 25°C", this embodiment adopts a multi-layer temperature control and protection structure. First, a heat exchanger 3 is provided before the oil enters the main liquid supply path. The heat exchanger 3 can be selected as an air-cooled or water-cooled structure according to the site conditions. Its oil inlet end is connected to the outlet of the oil supply pump 2, and its oil outlet end is connected to the filter 4, constituting the first layer of temperature adjustment link. The heat exchanger 3 is controlled by the control module to start and stop its fan or heat exchange medium circulation pump, and dynamically adjusts the cooling intensity according to the collected oil temperature signal to ensure that the oil temperature is within the set range before entering the variable piston pump 8.

[0106] Secondly, the system is equipped with an electric heater 1 in the oil tank, which is controlled by the ambient temperature and the initial temperature signal of the oil. When the ambient temperature is lower than 10°C, the preheating program is automatically started, and the fluidity of the oil is improved by gradually heating the oil to avoid oil suction difficulties or pump damage due to high viscosity during low-temperature startup. Combined with the two-way adjustment of the heat exchanger 3 and the heater, the system can continuously maintain the oil in the working temperature range of 3060°C within the fluctuation range of the external temperature from -10°C to 3540°C, thereby ensuring stable oil performance and constant system flow, and meeting the requirements for adapting to working conditions with large temperature fluctuations.

[0107] In order to meet the cleanliness control target of "pollution not higher than NAS 1638 level 9", this embodiment is equipped with a two-stage filtering device. The first stage is the main filter 4 in the oil supply path, which uses a filter element with a precision of 10μm or finer, and has a pressure difference monitoring function to indicate the clogging state of the filter element and feedback to the control module. The second stage is the high-pressure filter 4 set at the oil outlet of the variable piston pump 8, which usually uses a high-pressure pressure-resistant structure with a precision of not less than 5μm, which is used to further filter the particles such as abrasive debris and rubber fragments that may be generated during the operation of the system, to ensure that the oil flowing to the actuator meets the high cleanliness requirements.

[0108] In terms of control strategy, the system can comprehensively monitor the three parameters of temperature, pressure and filter 4 pressure difference through the control module. When the temperature is abnormal (too high or too low), the pollution exceeds the limit, or the pump outlet pressure fluctuation exceeds the set tolerance range, the system automatically adjusts the operating frequency of the oil supply pump 2, the working state of the heat exchanger 3, or suspends the operation of the variable piston pump 8, and issues a maintenance reminder to prompt the user to check the system or replace consumables. All monitoring data can be transmitted to the remote host computer through the communication module to realize the operation status visualization, trend recording and remote diagnosis functions.

[0109] In addition, all key components in this system, such as sensors, electric heaters 1, heat exchangers 3, filters 4 and controllers, are standardized and replaceable structures, and the installation interface and electrical wiring adopt modular design to facilitate on-site replacement and maintenance. The overall system adopts an integrated layout solution, which is suitable for application scenarios with extremely high requirements for temperature control and cleanliness, such as large-scale construction machinery, high-end CNC equipment, cold chain hydraulic equipment and wind power hydraulic systems.

[0110] In general, this implementation method ensures the continuous and reliable operation of the hydraulic pump station in an environment with drastic temperature changes and strict pollution control requirements through a highly adaptable temperature control structure, a refined filtering mechanism, an intelligent response control strategy, and a convenient maintenance system, effectively improving the robustness, safety, and service life of the pump station system. The implementation of this solution does not require special materials or exclusive control algorithms. The required components are all industrial standard parts. Ordinary technicians can build and deploy it according to the content of this disclosure, and it has clear industrial feasibility and practical engineering value.

[0111] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0112] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydraulic pump station oil supply control system, characterized in that, Comprising: Fuel tank; A supply oil pump, whose inlet end is connected to the fuel tank, and the outlet end is connected to the suction end of a variable displacement piston pump through an oil supply path; A heat exchanger and a filter are sequentially arranged in the oil supply path for adjusting the oil temperature and removing particulate impurities; A bypass pipeline is connected in parallel to the oil supply path, and the bypass pipeline is connected to the fuel tank through a check valve, and the opening pressure of the check valve is less than 2 bar; The outlet end of the variable displacement piston pump is connected to an external hydraulic system and is provided with a high-pressure filter; A detection device is arranged in the oil supply path for collecting the temperature and / or pressure signals of the oil; A control module is connected to the detection device, the supply oil pump, the variable displacement piston pump and the heat exchanger, and is configured to receive the detection signal, compare the signal with a preset threshold value, and control the start and stop states of the supply oil pump, the variable displacement piston pump and the heat exchanger according to the comparison result.

2. The hydraulic pump station oil supply control system according to claim 1, wherein An electric heater is arranged in the fuel tank, and the electric heater is electrically connected to the control module. When the control module detects that the oil temperature is lower than a preset temperature threshold value, it controls the electric heater to heat the oil.

3. The hydraulic pump station oil supply control system according to claim 1 or 2, characterized in that, When the control module detects that the oil temperature and / or pressure do not reach the preset start condition, it does not output the start signal of the variable displacement piston pump until the detection data meet the preset start condition.

4. The hydraulic pump station oil supply control system according to any one of claims 1 to 3, characterized in that When the control module controls the start of the variable displacement piston pump, it controls the supply oil pump and the heat exchanger to operate synchronously to maintain the stability of the oil temperature and flow rate.

5. The hydraulic pump station oil supply control system according to any one of claims 1 to 4, characterized in that, The control module is a programmable logic controller, and the control program executed by it includes: collecting the oil state signal, comparing the signal with the corresponding threshold value, and outputting a control instruction to control the operation of the electric heater, the supply oil pump, the heat exchanger and the variable displacement piston pump.

6. A hydraulic pump station oil supply device, characterized in that, Comprising: Supply oil pump; A heat exchanger, whose inlet end is connected to the outlet end of the supply oil pump; A filter, whose inlet end is connected to the outlet end of the heat exchanger; A variable displacement piston pump, whose suction end is connected to the outlet end of the filter; A check valve, one end of which is connected to the filter and the other end is connected to the fuel tank, and the opening pressure of the check valve is less than 2 bar; The outlet end of the variable displacement piston pump is sequentially connected to a high-pressure filter and a liquid supply path.

7. The hydraulic pump station oil supply device according to claim 6, characterized in that, An electromagnetic overflow valve is arranged in the liquid supply path, and the outlet of the overflow valve is connected to the fuel tank through an oil return path.

8. The hydraulic pump station oil supply device according to claim 7, characterized in that, The control end of the electromagnetic overflow valve is connected to a control circuit, and the control circuit is configured to output an opening signal when the system pressure exceeds a preset threshold value to make the overflow valve in an open state.

9. The hydraulic pump station oil supply control system according to any one of claims 1 to 5, characterized in that An electric heater electrically connected to the control module is arranged in the fuel tank, and the control module is configured to control the electric heater to be powered on and started when it is judged according to the temperature signal provided by the ambient temperature sensor that the ambient temperature is lower than 10°C.

10. The hydraulic pump station oil supply control system or the hydraulic pump station oil supply device according to any one of claims 1 to 9, characterized in that, The system or device is configured to operate in a hydraulic application environment where the temperature fluctuation is not less than 25°C and the oil contamination degree is not higher than NAS1638 level 9 to improve the start stability and oil supply reliability of the equipment.

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