A pipeline temperature regulating device

Abstract

This utility model provides a pipeline temperature regulation device, including: an oil tank, an oil extraction assembly, an oil supply pipeline, and a temperature control assembly connected between the oil extraction assembly and the oil supply pipeline; a temperature transmitter is installed in the temperature control pipeline and located downstream of the mixing side outlet, used to detect the temperature of the mixed oil; one end of the air source pipeline is a compressed air inlet, and the other end is sealed and connected to the pneumatic actuator of the pneumatic diaphragm temperature control valve; the control system is connected to the temperature transmitter and the air source pipeline respectively, used to receive the detection signal from the temperature transmitter and adjust the output air pressure of the air source pipeline, and the pneumatic actuator adjusts the opening of the pneumatic diaphragm temperature control valve according to the air pressure change, so as to control the oil temperature in the oil supply pipeline. The pipeline temperature regulation device disclosed in this application realizes rapid response and precise regulation of oil temperature, reduces oil flow and pressure fluctuations, and ensures stable oil parameters.

Description

Technical Field

[0001] This utility model relates to the field of lubricating oil station technology, and in particular to a pipeline temperature regulating device. Background Technology

[0002] The lubrication station system is a key support for the stable operation of the unit. Its core function is to continuously provide lubricating oil, regulating oil, turning oil, jacking oil, and emergency oil that meet the cleanliness standards, have stable pressure, and constant flow to key moving parts of the unit such as bearings, gears, and pistons. Among these, the temperature stability of the oil in the pipeline directly affects the oil viscosity and lubrication performance, which in turn determines the wear degree and service life of the unit's moving parts.

[0003] However, existing devices for regulating pipeline oil temperature struggle to achieve rapid and precise temperature control, failing to respond quickly to sudden changes in oil temperature. This is particularly problematic in conditions requiring timely temperature response, such as unit start-up and shutdown or sudden load changes, where delayed adjustments can easily cause oil temperatures to exceed reasonable ranges. Furthermore, the inability to precisely adjust valve openings based on oil temperature changes leads to significant fluctuations in flow rate and pressure as oil passes through valves, making it difficult to maintain stable oil flow. This fails to meet the demands of scenarios requiring constant flow and pressure, ultimately hindering both rapid temperature response and the stability of oil parameters, indirectly impacting the operational accuracy and lifespan of downstream equipment.

[0004] It should be noted that the above description of the background technology is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background technology section of this application. Utility Model Content

[0005] The purpose of this utility model is to disclose a pipeline temperature regulation device to solve many defects of existing devices for pipeline oil temperature regulation, especially to achieve rapid response and precise regulation of oil temperature, reduce oil flow and pressure fluctuations, and ensure stable oil parameters.

[0006] To achieve the above objectives, this utility model provides a pipeline temperature regulation device, comprising: an oil tank, an oil extraction assembly, an oil supply pipeline, and a temperature control assembly connected between the oil extraction assembly and the oil supply pipeline;

[0007] The oil extraction assembly is connected to the oil tank so that the oil is delivered to the oil supply pipeline after being conditioned by the temperature control assembly.

[0008] The temperature control components include: a cooling device, a temperature control pipeline, a pneumatic diaphragm temperature control valve, a temperature transmitter, a gas source pipeline, and a control system;

[0009] The cooling device is connected to the oil outlet pipeline included in the oil pumping assembly. One end of the temperature control pipeline is connected to the oil outlet pipeline and is formed upstream of the cooling device along the oil delivery direction. The other end of the temperature control pipeline is connected to the oil supply pipeline.

[0010] The pneumatic diaphragm temperature control valve is installed in the temperature control pipeline and has a hot side inlet, a cold side inlet and a mixing side outlet;

[0011] The hot-side inlet is located near the junction of the temperature control pipeline and the oil outlet pipeline. The cold-side inlet is connected to the outlet pipeline of the cooling device. The mixing-side outlet is formed on the side of the temperature control pipeline that connects to the oil supply pipeline, and is used to mix the oil flowing in from the hot-side inlet and the cold-side inlet.

[0012] The temperature transmitter is installed in the temperature control pipeline and located downstream of the mixing side outlet, and is used to detect the temperature of the mixed oil.

[0013] One end of the air source pipeline is a compressed air inlet, and the other end is sealed and connected to the pneumatic actuator of the pneumatic diaphragm temperature control valve.

[0014] The control system is connected to the temperature transmitter and the air source pipeline respectively, and is used to receive the detection signal of the temperature transmitter and adjust the output air pressure of the air source pipeline. The pneumatic actuator adjusts the opening of the pneumatic diaphragm temperature control valve according to the air pressure change, so as to control the oil temperature in the oil supply pipeline.

[0015] As a further improvement of this utility model, the temperature control component also includes an isolation component and at least one bypass shut-off valve;

[0016] The isolation assembly includes: a first ball valve disposed on the temperature control pipeline and located upstream of the hot side inlet; a second ball valve disposed on the outlet pipeline and located upstream of the cold side inlet; and a third ball valve disposed on the temperature control pipeline and located downstream of the mixing side outlet.

[0017] The two ends of the bypass shut-off valve are respectively connected to the outlet pipeline and the temperature control pipeline.

[0018] As a further improvement of this utility model, the pneumatic diaphragm temperature control valve integrates an intelligent positioner, which is electrically connected to the pneumatic actuator of the pneumatic diaphragm temperature control valve.

[0019] As a further improvement of this utility model, the smart locator is equipped with a surge protector.

[0020] As a further improvement of this utility model, the cooling device is a dual-cooler.

[0021] As a further improvement of this utility model, the oil pumping assembly includes: an oil pump and a pressure regulating valve pipeline. The oil pump's inlet end is connected to the oil tank, and the oil pump's outlet end is connected to the oil outlet pipeline. One end of the pressure regulating valve pipeline is connected to the oil tank, and the other end is connected to the oil outlet pipeline. The pressure regulating valve pipeline is equipped with a pressure regulating valve for adjusting the oil pressure in the oil outlet pipeline.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: the oil extraction assembly draws oil from the oil tank and transports it through the oil outlet pipeline. Part of the oil transported through the oil outlet pipeline flows into the cooling device for cooling, while the other part of the oil is transported to the pneumatic diaphragm temperature control valve through the hot side inlet. The cooling device cools the oil, and the cooled oil enters the cold side inlet of the pneumatic diaphragm temperature control valve through the outlet pipeline, where it mixes with the uncooled oil transported to the hot side inlet through the temperature control pipeline. At the same time, the temperature transmitter detects the oil temperature downstream of the mixing side outlet in real time and transmits the signal to the control system. The control system adjusts the air pressure output from the air source pipeline to the pneumatic actuator based on the difference between the detected temperature and the set temperature, thereby driving the pneumatic diaphragm temperature control valve to adjust its opening and precisely control the mixing ratio of cold and hot oil. The temperature-adjusted oil is finally transported to the oil supply pipeline through the temperature control pipeline to provide downstream equipment with oil whose temperature, flow rate, and pressure all meet the requirements. Attached Figure Description

[0023] Figure 1 This is an overall schematic diagram of the pipeline temperature regulating device disclosed in this utility model;

[0024] Figure 2 This is a schematic diagram of the overall piping temperature control device from another perspective, in which the cooler is omitted;

[0025] Figure 3 A schematic diagram of the pipeline temperature control device from another perspective;

[0026] Figure 4 This is a top view of the pipeline temperature control device. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0028] Please refer to Figures 1 to 4 This invention discloses a specific implementation of a pipeline temperature regulation device.

[0029] Reference Figures 1 to 4 As shown, in this embodiment, the pipeline temperature regulating device 100 includes: an oil tank 10, an oil pumping component 20, an oil supply pipeline 30, and a temperature control component 40 connected between the oil pumping component 20 and the oil supply pipeline 30.

[0030] The oil pumping component 20 is connected to the oil tank 10 to transport the oil fluid to the oil supply pipeline 30 after temperature adjustment through the temperature control component 40.

[0031] The temperature control component 40 includes: a cooling device 41, a temperature control pipeline 42, a pneumatic diaphragm temperature control valve 43, a temperature transmitter 50, a gas source pipeline 60, and a control system; the cooling device 41 is connected to the oil outlet pipeline 21 included in the oil pumping component 20, one end of the temperature control pipeline 42 is connected to the oil outlet pipeline 21 and is formed upstream of the cooling device 41 along the oil fluid transportation direction, and the other end of the temperature control pipeline 42 is connected to the oil supply pipeline 30.

[0032] The pneumatic diaphragm temperature control valve 43 is arranged on the temperature control pipeline 42 and has a hot side inlet 431, a cold side inlet 432, and a mixed side outlet 433; the hot side inlet 431 is close to the connection of the temperature control pipeline 42 and the oil outlet pipeline 21, the cold side inlet 432 is connected to the outlet pipeline 411 of the cooling device 41, and the mixed side outlet 433 is formed on the side where the temperature control pipeline 42 is connected to the oil supply pipeline 30, and is used for mixing the oil fluid flowing in from the hot side inlet 431 and the cold side inlet 432.

[0033] The temperature transmitter 50 is arranged on the temperature control pipeline 42 and is located downstream of the mixed side outlet 433, and is used for detecting the temperature of the mixed oil fluid; one end of the gas source pipeline 60 is a compressed air access end, and the other end is hermetically connected to the pneumatic actuator of the pneumatic diaphragm temperature control valve 43; the control system is respectively connected to the temperature transmitter 50 and the gas source pipeline 60, and is used for receiving the detection signal of the temperature transmitter 50 and adjusting the output air pressure of the gas source pipeline 60. The pneumatic actuator adjusts the opening degree of the pneumatic diaphragm temperature control valve 43 according to the change of the air pressure to control the temperature of the oil fluid in the oil supply pipeline 30.

[0034] The pipeline temperature regulating device 100 disclosed in this utility model involves an oil extraction assembly 20 drawing oil from an oil tank 10 and transporting it through an oil outlet pipeline 21. Part of the oil transported through the oil outlet pipeline 21 flows into a cooling device 41 for cooling, while the other part of the oil is transported through a hot-side inlet 431 to a pneumatic diaphragm temperature control valve 43. The cooling device 41 cools the oil, and the cooled oil then enters the cold-side inlet 432 of the pneumatic diaphragm temperature control valve 43 through an outlet pipeline 411. There, it mixes with the uncooled oil transported from the temperature control pipeline 42 to the hot-side inlet 431 under the pneumatic diaphragm temperature control valve. The mixture is mixed inside valve 43. At the same time, the temperature of the oil downstream of the mixing side outlet 433 is detected in real time by temperature transmitter 50, and the signal is transmitted to the control system (not shown). The control system adjusts the air pressure output from air source pipeline 60 to pneumatic actuator (not shown) according to the difference between the detected temperature and the set temperature, thereby driving the pneumatic diaphragm temperature control valve 43 to adjust the opening degree and accurately control the mixing ratio of cold and hot oil. The oil after temperature adjustment is finally delivered to oil supply pipeline 30 through temperature control pipeline 42 to provide downstream equipment with oil whose temperature, flow rate and pressure meet the requirements.

[0035] The pneumatic diaphragm temperature control valve 43 uses compressed air supplied by the air source pipeline 60 as its power source. Since the action speed of the pneumatic actuator is much faster than that of traditional mechanical temperature sensing drive or ordinary electric drive, it can quickly adjust the valve opening. At the same time, the temperature transmitter 50 is located downstream of the mixing side outlet 433 to detect the adjusted oil temperature. The signal can be fed back to the control system in real time to avoid oil overheating caused by adjustment lag under operating conditions such as unit start-up and shutdown and sudden load changes.

[0036] The pneumatic diaphragm temperature control valve 43 has a three-port structure: a hot-side inlet 431, a cold-side inlet 432, and a mixing-side outlet 433, instead of a traditional single-pass system. The mixing ratio of the uncooled oil at the hot-side inlet 431 to the cooled oil at the cold-side inlet 432 can be controlled by adjusting the valve opening of the pneumatic diaphragm temperature control valve 43, thereby achieving precise temperature control.

[0037] The control system adjusts the output air pressure of the air source pipeline 60 based on the real-time detection signal from the temperature transmitter 50. If the detected temperature is slightly higher than the set value, the air source pressure is slightly increased, resulting in a slight increase in valve opening and a higher proportion of cold oil. If the temperature is slightly lower, the air pressure is slightly decreased, the valve opening is reduced, and the proportion of hot oil is increased, thereby reducing the flow and pressure fluctuations of the oil as it flows through the valve and meeting the requirements for constant oil parameters.

[0038] In some examples, the parameter Figure 1 and Figure 2As shown, the temperature control assembly 40 also includes an isolation assembly and at least one bypass shut-off valve 80; the isolation assembly includes: a first ball valve 71 disposed on the temperature control pipeline 42 and located upstream of the hot side inlet 431, a second ball valve 72 disposed on the outlet pipeline 411 and located upstream of the cold side inlet 432, and a third ball valve 73 disposed on the temperature control pipeline 42 and located downstream of the mixing side outlet 433; the two ends of the bypass shut-off valve 80 are respectively connected to the outlet pipeline 411 and the temperature control pipeline 42, the end of the bypass shut-off valve 80 connected to the outlet pipeline 411 is located upstream of the second ball valve 72, and the end of the bypass shut-off valve 80 connected to the temperature control pipeline 42 is located downstream of the third ball valve 73.

[0039] When the pipeline temperature regulating device 100 is operating normally, the first ball valve 71, the second ball valve 72, and the third ball valve 73 are all fully open. The first ball valve 71 is located upstream of the hot side inlet 431 of the temperature control pipeline 42, ensuring that the uncooled oil from the oil outlet pipeline 21 can flow smoothly into the hot side inlet 431; the second ball valve 72 is located upstream of the cold side inlet 432 of the outlet pipeline 411, ensuring that the oil cooled by the cooling device 41 is stably delivered to the cold side inlet 432; the third ball valve 73 is located downstream of the mixing side outlet 433 of the temperature control pipeline 42, allowing the mixed and temperature-regulated oil to flow smoothly to the oil supply pipeline 30 without interfering with the normal temperature regulation process of the temperature control component 40. When the pneumatic diaphragm temperature control valve 43 needs maintenance (such as valve core wear or pneumatic actuator failure), the first ball valve 71, the second ball valve 72, and the third ball valve 73 can be closed to achieve safe isolation. The first ball valve 71 is closed to block the uncooled oil upstream of the hot side inlet 431, and the second ball valve 72 is closed to cut off the cooling oil upstream of the cold side inlet 432, preventing oil from continuously flowing into the pneumatic diaphragm temperature control valve 43 to be repaired; the third ball valve 73 is closed to prevent the oil in the downstream temperature control pipeline 42 from flowing back to the valve body under repair, and at the same time to prevent oil leakage into the downstream passage during the repair process, providing a safe operating environment for the repair personnel.

[0040] When the pipeline temperature regulating device 100 is operating normally, the bypass shut-off valve 80 is closed to prevent the cooling oil in the outlet pipeline 411 from flowing directly into the temperature control pipeline 42 downstream of the mixing side outlet 433. This prevents oil that has not undergone hot and cold mixing regulation from directly entering the oil supply pipeline 30, ensuring that the oil delivered downstream is detected by the temperature transmitter 50 and regulated by the pneumatic diaphragm temperature control valve 43, guaranteeing that the oil temperature meets the requirements. When the pneumatic diaphragm temperature control valve 43 is closed for maintenance of the three ball valves, the bypass shut-off valve 80 is opened. The oil cooled by the cooling device 41 does not need to pass through the pneumatic diaphragm temperature control valve 43 under maintenance and can directly enter the temperature control pipeline 42 downstream of the third ball valve 73 through the bypass shut-off valve 80, and is finally delivered to the oil supply pipeline 30. This ensures that the oil supply process is not interrupted during maintenance, avoiding the problem of oil shortage and operation interruption of downstream units caused by maintenance shutdowns of traditional units. It should be noted that when the pneumatic diaphragm temperature control valve 43 is under maintenance, the oil is only transported through the cooling device 41 via a single cooling path, and the mixing ratio of hot and cold oil cannot be adjusted by the pneumatic diaphragm temperature control valve 43, so the oil temperature cannot be precisely controlled. After the temperature control valve is repaired and the normal passage is restored, the pipeline temperature regulating device 100 can once again achieve precise regulation of the oil temperature.

[0041] In some examples, the pneumatic diaphragm temperature control valve 43 integrates an intelligent positioner (not shown), which is electrically connected to the pneumatic actuator of the valve. The oil temperature regulation command output by the control system is an electrical signal, while the pneumatic actuator relies on an air pressure signal to drive the valve core. The intelligent positioner accurately converts the electrical signal transmitted by the control system into an air pressure signal that matches the regulation requirements and sends it to the pneumatic actuator. After the intelligent positioner is electrically connected to the pneumatic actuator, it can drive the diaphragm and valve core within the pneumatic actuator to achieve a small displacement through the output precise air pressure signal, thereby improving the valve regulation accuracy and reducing temperature regulation error.

[0042] In some examples, the smart positioner is equipped with a surge protector (not shown). The surge protector absorbs and suppresses instantaneous surge currents generated during thunderstorms and other similar events. Because the smart positioner contains precision electronic circuitry (such as signal conversion modules and opening detection sensors), surge currents can easily break down the circuitry or damage components; this surge protector intercepts abnormal currents, preventing them from entering the smart positioner and causing it to malfunction. Simultaneously, since the smart positioner is electrically connected to the pneumatic actuator, its failure can lead to uncontrolled opening of the temperature control valve; the surge protector indirectly ensures that the temperature control valve's regulating function remains uninterrupted. This allows the smart positioner to operate normally even in areas prone to thunderstorms, reducing equipment failures caused by surges and lowering maintenance frequency; furthermore, it ensures that the pneumatic diaphragm temperature control valve 43 continuously and accurately regulates the oil temperature, preventing oil temperature fluctuations from affecting downstream equipment and improving the environmental adaptability and operational reliability of the pipeline temperature regulation device 100.

[0043] In some examples, cooling device 41 is a dual cooler. The dual cooler contains two cooling units (not shown). During normal operation, only one cooling unit is activated, while the other is in standby mode. The oil flows only through the operating cooling unit to achieve cooling, ensuring that the cooling process meets the oil's cooling requirements. When the operating cooling unit experiences a malfunction such as blockage, leakage, or decreased heat exchange efficiency, the system can switch to the standby cooling unit without stopping the machine, quickly restoring the oil cooling function and avoiding the problem of no cooling oil supply when a single cooler fails. At the same time, the faulty cooling unit can be disassembled, cleaned, and its components replaced for maintenance, while the standby cooling unit continues to operate without interrupting the oil cooling process.

[0044] In some examples, the oil pumping assembly 20 includes: an oil pump 22 and a pressure regulating valve pipeline 23. The oil pump 22 is connected to the oil tank 10 at its inlet end and to the oil outlet pipeline 21 at its outlet end. One end of the pressure regulating valve pipeline 23 is connected to the oil tank 10 and the other end is connected to the oil outlet pipeline 21. The pressure regulating valve pipeline 23 is equipped with a pressure regulating valve for adjusting the oil pressure in the oil outlet pipeline 21.

[0045] Oil pump 22 draws oil from oil tank 10 and delivers it to oil outlet pipeline 21, providing driving force for the oil to flow to cooling device 41 and temperature control pipeline 42, ensuring that oil can continuously enter temperature control component 40 for temperature regulation. When the oil pressure in oil outlet pipeline 21 exceeds the set value, the pressure regulating valve (not shown) on pressure regulating valve pipeline 23 automatically opens, allowing some oil to flow back to oil tank 10 through pressure regulating valve pipeline 23, reducing the pressure in oil outlet pipeline 21; after the pressure returns to normal, the pressure regulating valve closes, stopping the backflow, thereby stabilizing the pressure in oil outlet pipeline 21 within the set range.

[0046] By regulating the pressure of the oil outlet pipeline 21 in real time through the pressure regulating valve, the pressure abnormality caused by factors such as the output fluctuation of the oil pump 22 and the change of pipeline resistance is eliminated, so that the oil pressure of the oil outlet pipeline 21 is always stable, avoiding damage to pipelines and valves (such as pneumatic diaphragm temperature control valve 43) by high pressure. This provides a stable basic pressure environment for the proportional adjustment of hot and cold oil in the temperature control component 40, reduces the flow deviation caused by pressure fluctuation, and ultimately ensures the stability of the oil parameters (pressure and flow) output by the oil supply pipeline 30, thereby improving the reliability of downstream equipment operation.

[0047] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

[0048] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pipe temperature regulating device, characterized by, include: Oil tank, oil extraction assembly, oil supply pipeline, and temperature control assembly connecting the oil extraction assembly and the oil supply pipeline; The oil extraction assembly is connected to the oil tank so that the oil is delivered to the oil supply pipeline after being conditioned by the temperature control assembly. The temperature control components include: a cooling device, a temperature control pipeline, a pneumatic diaphragm temperature control valve, a temperature transmitter, a gas source pipeline, and a control system; The cooling device is connected to the oil outlet pipeline included in the oil pumping assembly. One end of the temperature control pipeline is connected to the oil outlet pipeline and is formed upstream of the cooling device along the oil delivery direction. The other end of the temperature control pipeline is connected to the oil supply pipeline. The pneumatic diaphragm temperature control valve is installed in the temperature control pipeline and has a hot side inlet, a cold side inlet and a mixing side outlet; The hot-side inlet is located near the junction of the temperature control pipeline and the oil outlet pipeline. The cold-side inlet is connected to the outlet pipeline of the cooling device. The mixing-side outlet is formed on the side of the temperature control pipeline that connects to the oil supply pipeline, and is used to mix the oil flowing in from the hot-side inlet and the cold-side inlet. The temperature transmitter is installed in the temperature control pipeline and located downstream of the mixing side outlet, and is used to detect the temperature of the mixed oil. One end of the air source pipeline is a compressed air inlet, and the other end is sealed and connected to the pneumatic actuator of the pneumatic diaphragm temperature control valve. The control system is connected to the temperature transmitter and the air source pipeline respectively, and is used to receive the detection signal of the temperature transmitter and adjust the output air pressure of the air source pipeline. The pneumatic actuator adjusts the opening of the pneumatic diaphragm temperature control valve according to the air pressure change, so as to control the oil temperature in the oil supply pipeline.

2. The line temperature regulating device of claim 1, wherein The temperature control assembly also includes an isolation assembly and at least one bypass shut-off valve; The isolation assembly includes: a first ball valve disposed on the temperature control pipeline and located upstream of the hot side inlet; a second ball valve disposed on the outlet pipeline and located upstream of the cold side inlet; and a third ball valve disposed on the temperature control pipeline and located downstream of the mixing side outlet. The two ends of the bypass shut-off valve are respectively connected to the outlet pipeline and the temperature control pipeline.

3. The conduit temperature conditioning device of claim 1, wherein, The pneumatic diaphragm temperature control valve integrates an intelligent positioner, which is electrically connected to the pneumatic actuator of the pneumatic diaphragm temperature control valve.

4. The conduit temperature conditioning device of claim 3, wherein, The smart locator is equipped with a surge protector.

5. The conduit temperature conditioning device of claim 1, wherein, The cooling device is a dual-cooler.

6. The conduit temperature regulating device of claim 1, wherein, The oil pumping assembly includes an oil pump and a pressure regulating valve pipeline. The oil pump's inlet end is connected to the oil tank, and the oil pump's outlet end is connected to the oil outlet pipeline. One end of the pressure regulating valve pipeline is connected to the oil tank, and the other end is connected to the oil outlet pipeline. The pressure regulating valve pipeline is equipped with a pressure regulating valve for adjusting the oil pressure in the oil outlet pipeline.

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