Forced lubrication system and lubrication method for lift pump

Abstract

The forced lubrication system comprises an oil tank, a gear oil pump and a controller, the oil tank is connected with the gear oil pump, the gear oil pump is connected with a lubrication point connector of a pump body through a controllable oil nozzle, and a lubricating oil outlet automatically flows back to a rack through parts of a lubrication point and then flows back to the oil tank. A lubricating oil way is formed; a lubricating oil detection mechanism is arranged in the lubricating oil way and connected with the input end of a controller, and the output end of the controller is connected with the controllable oil nozzle and the control end of the gear oil pump. The controller controls the rotating speed of the gear oil pump in real time to dynamically match the lubricating oil flow with the heating value of the lift pump. The plunger type lift pump can reduce low-speed working condition power loss, prolong the service life of the crankshaft bearing and the crosshead and reduce the operation cost, and is suitable for mine drainage and water conservancy project high-altitude and low-altitude water delivery scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plunger water-lifting pump, in particular to a plunger water-lifting pump forced lubrication system and a lubrication method. BACKGROUND

[0002] In the mining and water conservancy engineering, the water in the low place of the mine or the water in the low altitude area is transported to the outside of the mine or the high altitude drinking water / irrigation area by the plunger water-lifting pump, so as to avoid the collapse and water gushing accidents of the mine and guarantee the realization of the water conservancy engineering function. The lubrication system of the water-lifting pump is the core component for ensuring the reliable operation thereof, and the reliability of the oil injection nozzle directly determines the service life and the operation stability of the crankshaft bearing.

[0003] With the development of the water-lifting pump in the direction of high power and large flow, the heat generation in the operation process is significantly increased, and the demand for the amount of lubricating oil is also increased. The existing water-lifting pump generally adopts a constant pressure lubrication mode, that is, the lubricating oil is delivered by a gear oil pump with fixed power, and the system oil pressure is always maintained at 0.7-0.8 MPa and is not adjusted with the change of the rotating speed of the water-lifting pump. However, the water-lifting pump is controlled by frequency conversion in the actual operation: when operating at high speed (such as full load water delivery), the heat generation is large, and more lubricating oil is needed to take away the heat; when operating at low speed (such as low load water delivery), the heat generation is small, and the demand for the amount of lubricating oil is reduced.

[0004] The above constant pressure lubrication mode has obvious defects: under the low speed working condition, the gear oil pump still outputs the lubricating oil flow similar to that under the high speed working condition, which leads to the waste of the motor power and increases the operation energy consumption and cost; at the same time, the excessive lubricating oil is easy to cause the local oil accumulation at the lubricating point under the low speed working condition, which in turn affects the heat dissipation efficiency and shortens the service life of the components. Therefore, it is urgent to develop a forced lubrication technology capable of dynamically adjusting the amount of lubricating oil according to the working condition of the water-lifting pump. SUMMARY

[0005] In view of the above defects or deficiencies, the present application aims to provide a plunger water-lifting pump forced lubrication system and a lubrication method.

[0006] To achieve the above purpose, the technical scheme of the present application is as follows: A plunger water-lifting pump forced lubrication system, comprising: an oil tank, a gear oil pump, and a controller, the oil tank is connected with the gear oil pump, the gear oil pump is connected with the lubricating point interface of the pump body through a controllable oil injection nozzle, the lubricating oil outlet is returned to the rack through the self-flow of the parts of the lubricating point and then returned to the oil tank, forming a lubricating oil circuit; a lubricating oil detection mechanism is arranged in the lubricating oil circuit, the lubricating oil detection mechanism is connected with the input end of the controller, and the output end of the controller is connected with the control end of the controllable oil injection nozzle and the gear oil pump.

[0007] The gear oil pump is a variable frequency motor driven oil pump, which is used for delivering lubricating oil to the lubricating point of the plunger pump.

[0008] The controllable oil nozzle comprises a core body, the oil nozzle body is provided with a control switch for controlling the size of the aperture, and the oil quantity of the lubricating oil is changed.

[0009] The controllable oil nozzle is a temperature-sensitive oil nozzle, which is arranged at the power end bearing and the crosshead lubrication point of the water-lifting pump, and when the detected temperature is less than or equal to 55 DEG C, the fixed oil injection aperture is maintained, and when the temperature is greater than 55 DEG C, the oil injection aperture is automatically increased.

[0010] The temperature-sensitive oil nozzle adopts a core body made of a nickel-titanium-copper (Ti-45Ni-5Cu) shape memory alloy, and the oil injection aperture is adjusted through the temperature deformation of the core body.

[0011] The lubricating oil detection mechanism comprises a temperature-sensitive sensor arranged at the controllable oil nozzle, the temperature-sensitive sensor is used for detecting the working temperature of the pump body, and the control switch is controlled.

[0012] The lubricating oil detection mechanism further comprises a lubricating oil pressure sensor arranged in the lubricating oil path, the lubricating oil pressure sensor is used for detecting the system oil pressure and outputting a feedback signal to the controller.

[0013] The controller is electrically connected with the gear oil pump and the lubricating oil pressure sensor respectively, is used for receiving the oil pressure feedback signal and controlling the rotating speed of the gear oil pump.

[0014] The controller is provided with a PLC control module, a preset system oil pressure target range is 0.6-0.9 MPa, the rotating speed of the gear oil pump is controlled to be increased when the oil pressure is lower than 0.6 MPa, and the rotating speed of the gear oil pump is controlled to be decreased when the oil pressure is higher than 0.9 MPa.

[0015] A lubricating method of the above-mentioned water-lifting pump forced lubrication system, comprising: The pump body starts to work, the gear oil pump is driven by the gear oil pump at an initial rotating speed, and the lubricating oil is delivered to the lubrication point through the temperature-sensitive oil nozzle; If the temperature of the lubrication point is less than or equal to 55 DEG C, and the system oil pressure is 0.6-0.9 MPa, the aperture of the controllable oil nozzle is fixed, and the frequency conversion motor maintains the initial rotating speed; When the pump body operates at a high speed of 188 min-1, the temperature of the lubrication point is greater than 55 DEG C, the aperture of the oil nozzle is increased, and the system oil pressure is decreased; after the lubricating oil pressure sensor detects the decrease of the oil pressure, a signal is transmitted to the controller, the controller controls the gear oil pump to increase the rotating speed, and the flow of the gear oil pump is increased; After the lubricating oil flow is increased, the temperature of the lubrication point is reduced to less than or equal to 55 DEG C, the aperture of the oil nozzle is restored, the system oil pressure is increased, and the controller controls the gear oil pump to decrease the rotating speed to an adaptive rotating speed; When the pump body operates at a low speed of 50 min-1, the temperature of the lubrication point is less than or equal to 55 DEG C, and if the system oil pressure is higher than the target range of 0.6-0.9 MPa, the controller controls the gear oil pump to decrease the rotating speed, and the lubricating oil flow is reduced.

[0016] Compared with the prior art, the present application has the following advantages: Energy saving and consumption reduction: through the cooperative control of the frequency conversion motor and the temperature sensing nozzle, the dynamic matching of the lubricating oil flow and the heat generation of the water lifting pump is realized, the power waste under low speed working condition is avoided, and the operation energy consumption is reduced; Cost reduction: while reducing power loss, the problem of oil accumulation at the lubrication point caused by excessive lubricating oil is avoided, the service life of the crankshaft bearing, crosshead and oil nozzle is prolonged, and the equipment maintenance and replacement cost is reduced; Reliability improvement: the closed-loop control logic ensures that the lubrication point is always in the optimal lubrication state, adapts to the high and low speed variable frequency operation condition of the water lifting pump, and avoids equipment failure caused by insufficient or excessive lubrication; Strong adaptability: it can be adapted to different power and different application scenarios (mines and water conservancy projects) of the plunger type water lifting pump, without the need for large-scale modification of existing equipment, and has high compatibility. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of the installation structure of the water lifting pump forced lubrication system of the present application; Figure 2 is a side view of the water lifting pump forced lubrication system of the present application; Figure 3 is a front view of the water lifting pump forced lubrication system of the present application; Figure 4 is an installation structure diagram of the temperature sensing type oil nozzle of the present application; Figure 5 is a core structure diagram of the temperature sensing type oil nozzle of the present application.

[0020] In the figure, 1 is an oil tank, 2 is a gear oil pump, 3 is a controller, 4 is a pump body, 5 is a temperature sensing type oil nozzle, 6 is a temperature sensing sensor, 7 is a pressure sensing sensor, 51 is a core, and 52 is a control switch. DETAILED DESCRIPTION

[0022] The present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0023] As Figures 1-5As shown, the present application provides a water lifting pump forced lubrication system, mainly applied to water lifting pump, water lifting pump is mine tunnel drainage or water conservancy engineering high and low altitude water delivery plunger type water lifting pump, but also not limited to this, all the system needs to be lubricated in the plunger pump can use the lubrication system in the present application.

[0024] The specific structure of the system comprises: an oil tank 1, a gear oil pump 2, and a controller 3, the oil tank 1 is connected with the gear oil pump 2, the gear oil pump 2 is connected with the lubrication point interface of the pump body 4 through the controllable oil nozzle 5, the lubricating oil outlet is back to the rack through the self-flowing parts of the lubrication point and then flows back to the oil tank 1, forming a lubricating oil circuit; the lubricating oil circuit is provided with a lubricating oil detection mechanism, the lubricating oil detection mechanism is connected with the input end of the controller 3, and the output end of the controller 3 is connected with the control end of the controllable oil nozzle 5 and the gear oil pump 2.

[0025] It should be noted that in the present application, the gear oil pump 2 is a variable frequency motor driven oil pump, which is used to deliver lubricating oil to the lubrication point of the plunger pump.

[0026] The present application can control the caliber of the controllable oil nozzle 5 according to the requirement, so as to control the oil amount of the lubricating oil, further change the working temperature of the pump body 4, and the lubricating oil detection mechanism comprises: a temperature sensing sensor 6 arranged at the controllable oil nozzle 5, the temperature sensing sensor 6 is used to detect the working temperature of the pump body 4, and the controllable oil nozzle 5 is controlled to be opened or closed. In the present application, the controllable oil nozzle 5 can also be a temperature sensing type oil nozzle, which is arranged at the power end bearing and the cross head lubrication point of the water lifting pump. The specific temperature control process is that when the detected temperature is less than or equal to 55 DEG C, the fixed oil injection caliber is maintained, and when the temperature is greater than 55 DEG C, the oil injection caliber is automatically increased.

[0027] As shown in the figure, Figure 2 The controllable oil nozzle 5 comprises a core body 51, the oil nozzle body 51 is provided with a control switch 52 for controlling the caliber size, and the oil amount of the lubricating oil is changed. Alternatively, the temperature sensing type oil nozzle is made of a core body made of nickel-titanium-copper (Ti-45Ni-5Cu) shape memory alloy, and the oil injection caliber is adjusted by the temperature deformation of the core body.

[0028] Preferably, the lubricating oil detection mechanism further comprises a lubricating oil pressure sensor 7 arranged in the lubricating oil circuit, the lubricating oil pressure sensor 7 is used to detect the system oil pressure and output a feedback signal to the controller 3; the controller 3 is electrically connected with the gear oil pump 2 and the lubricating oil pressure sensor 7 respectively, is used to receive the oil pressure feedback signal and control the rotating speed of the gear oil pump 2, and achieves the purpose of controlling the amount of lubricating oil.

[0029] Specifically, the controller 3 is provided with a PLC control module, a preset system oil pressure target range is 0.6-0.9 MPa; when the oil pressure is lower than 0.6 MPa, the gear oil pump 2 is controlled to increase the speed, and when the oil pressure is higher than 0.9 MPa, the gear oil pump 2 is controlled to decrease the speed.

[0030] The application also provides a lubricating method of the water-lifting pump forced lubrication system, comprising: The pump body 4 starts to work, the gear oil pump 2 drives the gear oil pump at an initial speed, and the lubricating oil is delivered to the lubricating point through the temperature-sensitive oil nozzle; If the lubricating point temperature is ≤55℃, and the system oil pressure is 0.6-0.9 MPa, the controllable oil nozzle 5 has a fixed diameter, and the frequency conversion motor maintains the initial speed; When the pump body 4 operates at high speed, the lubricating point temperature is >55℃, the oil nozzle diameter is increased, and the system oil pressure is decreased; after the oil pressure sensor 7 detects the decrease of the oil pressure, a signal is transmitted to the controller 3, the controller 3 controls the gear oil pump 2 to increase the speed and increase the gear oil pump flow; After the lubricating oil flow is increased, the lubricating point temperature is reduced to ≤55℃, the oil nozzle diameter is restored, the system oil pressure is increased, and the controller 3 controls the gear oil pump 2 to decrease the speed to the adaptive speed; When the pump body 4 operates at low speed, the lubricating point temperature is ≤55℃, and if the system oil pressure is higher than the target range, the controller 3 controls the gear oil pump 2 to decrease the speed and reduce the lubricating oil flow.

[0031] Exemplarily, in the specific implementation: Water-lifting pump type: mine plunger type water-lifting pump, rated power 1600kW, frequency conversion speed range 5-1500rpm; Gear oil pump: model SU180, rated flow 180L / min, matched frequency conversion motor model YVF-160M1-4 (power 11kW, speed range 5-1500rpm); Temperature-sensitive nozzle: nickel-titanium shape memory alloy core is adopted, initial diameter 2mm (temperature ≤58℃), and the diameter is expanded to 3mm when the temperature is >58℃; Oil pressure sensor: model PT124B-25MPa, measurement accuracy ±0.5% FS, signal output 4-20mA; Control cabinet: built-in PLC, preset oil pressure control threshold: target oil pressure 0.7-0.8MPa, motor speed is increased when the oil pressure is lower than 0.6MPa, and the motor speed is decreased when the oil pressure is higher than 0.9MPa.

[0032] Low-speed working condition (water-lifting pump speed 500rpm) The water pump starts to run at low speed, the lubrication point temperature is 35℃ (≤58℃), and the temperature sensing nozzle aperture is kept at 2mm; the initial rotating speed of the gear oil pump frequency conversion motor is 800rpm, the lubricating oil flow is 60L / min, and the system oil pressure is 0.75MPa (in the target range); the oil pressure sensor feeds back a stable signal, the control cabinet controls the motor to maintain 800rpm, and no power is wasted.

[0033] High speed working condition (water pump rotating speed 1500rpm) The water pump is lifted to high speed operation, and the lubrication point temperature rises to 62℃ (>58℃) after 30 minutes; the system oil pressure drops to 0.55MPa (lower than the threshold value of 0.6MPa); the oil pressure sensor transmits the signal to the control cabinet, the PLC controls the rotating speed of the frequency conversion motor to be lifted to 1500rpm, and the flow of the gear oil pump is increased to 95L / min; the increased lubricating oil carries away heat, and the lubrication point temperature drops to 56℃ (≤58℃) after 15 minutes, the nozzle aperture returns to 2mm, and the system oil pressure rises to 0.72MPa; the control cabinet controls the rotating speed of the motor to fall back to 1000rpm, and the flow is maintained at 70L / min, to realize dynamic balance.

[0034] Working condition switching verification The water pump is switched from high speed (1500rpm) to low speed (500rpm), and the lubrication point temperature gradually drops to 40℃; the system oil pressure rises to 0.88MPa (close to the threshold value of 0.9MPa) due to the unchanged flow; after receiving the oil pressure signal, the control cabinet controls the rotating speed of the motor to drop to 700rpm, the flow to drop to 50L / min, and the oil pressure to stabilize at 0.73MPa, to avoid power loss in the low speed working condition.

[0035] It is obvious for those skilled in the art that the above specific factual examples are only preferred schemes of the present application, and therefore, the improvements and changes made by those skilled in the art to some parts of the present application still embody the principles of the present application and achieve the purposes of the present application, and all of them belong to the protection scope of the present application.

Claims

1. A water pumping force lubrication system, characterized by, The oil tank (1), gear oil pump (2), and controller (3), the oil tank (1) is connected with gear oil pump (2), the gear oil pump (2) is connected with the lubrication point interface of pump body (4) through controllable oil nozzle (5), lubricating oil outlet is returned to the frame through the self-flowing parts of lubrication point and then returns to the oil tank (1), forms lubricating oil circuit;The lubricating oil detection mechanism is arranged in the lubricating oil circuit, the lubricating oil detection mechanism is connected with the input end of controller (3), and the output end of controller (3) is connected with the control end of controllable oil nozzle (5) and gear oil pump (2).

2. The forced water pump lubrication system of claim 1, wherein, The gear oil pump (2) is a variable frequency motor driven oil pump, which is used to deliver lubricating oil to the lubrication point of the plunger pump.

3. The forced water pump lubrication system according to claim 1 or 2, characterized in that, The controllable oil nozzle (5) includes a core body (51), and the oil nozzle body (51) is provided with a control switch (52) for controlling the size of the aperture, and the oil quantity of the lubricating oil is changed.

4. The forced water pump lubrication system of claim 3, wherein, The controllable oil nozzle (5) is a temperature sensing type oil nozzle, which is arranged at the power end bearing and crosshead lubrication point of the water pump, and when the detected temperature is ≤55℃, the fixed oil injection aperture is maintained, and when the temperature is >55℃, the oil injection aperture is automatically increased.

5. The forced water pump lubrication system according to claim 3 or 4, characterized in that The temperature sensing type core body (51) is a core body made of nickel-titanium-copper (Ti-45Ni-5Cu) shape memory alloy, and the oil injection aperture is adjusted by temperature deformation of the core body.

6. The forced water pump lubrication system of claim 3, wherein, The lubricating oil detection mechanism includes a temperature sensing sensor (6) arranged at the controllable oil nozzle (5), and the temperature sensing sensor (6) is used to detect the working temperature of the pump body (4) and control the control switch (52).

7. The forced water pump lubrication system according to claim 1 or 2, characterized in that, The lubricating oil detection mechanism further includes a lubricating oil pressure sensor (7) arranged in the lubricating oil circuit, and the lubricating oil pressure sensor (6) is used to detect the system oil pressure and output a feedback signal to the controller (3).

8. The forced water pump lubrication system of claim 7, wherein, The controller (3) is electrically connected with the gear oil pump (2) and the lubricating oil pressure sensor (7) respectively, is used to receive the oil pressure feedback signal and control the rotating speed of the gear oil pump (2).

9. The forced water pump lubrication system of claim 8, wherein, The controller (3) is provided with a PLC control module, and the preset system oil pressure target range is 0.6-0.9MPa;When the oil pressure is lower than 0.6MPa, the rotating speed of the gear oil pump (2) is increased, and when the oil pressure is higher than 0.9MPa, the rotating speed of the gear oil pump (2) is decreased.

10. A method of lubricating a water pump forced lubrication system based on the system of any one of claims 1-9, characterized in that, It includes: The pump body (4) starts to work, the gear oil pump (2) drives the gear oil pump at the initial rotating speed, and the lubricating oil is delivered to the lubrication point through the temperature sensing type oil nozzle; If the lubrication point temperature is ≤55℃, and the system oil pressure is 0.6-0.9MPa, the controllable oil nozzle (5) aperture is fixed, and the variable frequency motor maintains the initial rotating speed; When the pump body (4) runs at a high speed of 188min-1, the lubrication point temperature is >55℃, the oil nozzle aperture is increased, and the system oil pressure is decreased;When the lubricating oil pressure sensor (7) detects that the oil pressure is decreased, the signal is transmitted to the controller (3), the controller (3) controls the gear oil pump (2) to increase the rotating speed, and the gear oil pump flow is increased; When the lubricating oil flow is increased, the lubrication point temperature is reduced to ≤55℃, the oil nozzle aperture is restored, the system oil pressure is increased, and the controller (3) controls the gear oil pump (2) to decrease the rotating speed to the adaptive rotating speed. When the pump body (4) is operated at low speed of 50 min-1, the lubrication point temperature is less than or equal to 55 ℃, and the system oil pressure is higher than the target range of 0.6-0.9 MPa, the controller (3) controls the gear oil pump (2) to reduce the speed and reduce the lubricating oil flow, so that the lubricating oil pressure is kept at 0.6-0.9 MPa.

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