High-temperature micro-flow lubricating oil supply system and method

Abstract

The invention discloses a high-temperature micro-flow lubricating oil supply system and method, and relates to the technical field of equipment lubrication. Comprising a lubricating oil tank, a first oil pump, a second oil pump, an oil mixing tank, a first speed regulating valve, a third speed regulating valve and a heater, the two ends of the first oil pump are communicated with the lubricating oil tank and the first speed regulating valve respectively, the other end of the first speed regulating valve is communicated with the heater, the heater heats passing lubricating oil, and the output end of the heater is communicated with the input end of equipment. The output end of the equipment communicates with the oil mixing tank, the two ends of the second oil pump communicate with the oil mixing tank and the oil tank correspondingly, and the oil outlet end of the first oil pump is provided with a second oil way for shunting and cooling and communicates with the oil mixing tank through the second oil way. The device is accurate in pressure control, wide in flow range, small in temperature drop, accurate in temperature control, convenient to operate, flexible in application and high in adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment lubrication, and in particular to a high-temperature, small-flow lubricating oil supply system and method. Background Art

[0002] The conventional lubricating oil supply device in China consists of an oil pump, a relief valve, a flow sensor, a pressure sensor and a pipeline. The commonly used lubricating oil supply method is that the motor drives the oil pump to provide the oil source, the relief valve adjusts the oil pump outlet pressure, the flow sensor measures the outlet flow, and the pressure sensor measures the outlet pressure. For specific parameters, please refer to Figure 2 , Figure 2 This is the reference scheme for this application. Figure 2 Taking the proposed conventional solution as an example, the following problems exist: 1. The oil pump outlet flow is high, making system pressure regulation difficult; 2. The optimal system operating pressure range of the relief valve is generally no less than 0.2MPa; below 0.2MPa, the system pressure becomes unstable; 3. The heater is often heated by the oil tank, and when the flow rate is less than 500ml / min, the temperature drop is large and the temperature is unstable; 4. When the oil tank is heated, the lubricating oil has poor fluidity and is prone to coking, making it impossible to provide high-temperature oil above 150°C; 5. The outlet flow rate cannot be remotely fine-tuned. In summary, existing conventional lubricating oil supply systems all suffer from high system oil pressure, large flow rate, severe temperature drop, difficult oil temperature control, difficult operation, and poor adaptability. Summary of the Invention

[0003] Purpose of the invention: Based on the problems mentioned in the background technology, a high-temperature, small-flow lubricating oil supply system and method are proposed.

[0004] Technical solution: A high-temperature, low-flow lubricating oil supply system, comprising:

[0005] Lubricating oil tank, first oil pump, second oil pump, oil mixing tank, first speed regulating valve, heater;

[0006] The first oil pump is used to connect the lubricating oil tank and the first speed regulating valve; the other end of the first speed regulating valve is connected to the heater; the output end of the heater is connected to the input end of the device; the output end of the device is connected to the mixing tank; the second oil pump is used to connect the mixing tank and the oil tank;

[0007] The flow rate of the output end of the heater is controlled; the flow at both ends of the second oil pump is controlled; by setting the second oil pump and the first oil pump in opposite flow directions, continuous supply of lubricating oil to the equipment is achieved; a second oil circuit is set at the oil outlet end of the first oil pump for diversion and cooling, and the oil is connected to the mixing tank through the second oil circuit.

[0008] In a further embodiment, a first speed regulating valve is installed between the first oil pump and the heater; and a first flow meter is installed between the first speed regulating valve and the heater.

[0009] In a further embodiment, a one-way valve is installed between the first speed regulating valve and the heater.

[0010] In a further embodiment, a third speed regulating valve is further included, and the output end of the heater is provided with two routes, one of which is connected to the second flow meter; the output end of the second flow meter is connected to the equipment, and a second temperature sensor and a second pressure sensor are provided; the other route is connected to the mixing tank through the third speed regulating valve.

[0011] In a further embodiment, a third ball valve is installed between the oil inlet of the second oil pump and the oil mixing tank, and a second ball valve is installed between the output end of the third ball valve and the lubricating oil tank.

[0012] In a further embodiment, the second oil circuit includes:

[0013] a second speed regulating valve, a first end of which is connected to the output end of the first oil pump;

[0014] The cooler has an oil inlet end connected to the second end of the second speed regulating valve, and an oil outlet end connected to the oil mixing tank.

[0015] In a further embodiment, a relief valve is further included, wherein the oil inlet end of the relief valve is connected to the output end of the first oil pump, and the oil outlet end of the relief valve is connected to the lubricating oil tank.

[0016] In a further embodiment, a first pressure sensor and a first temperature sensor are provided at the oil outlet of the first oil pump.

[0017] In a further embodiment, filters are installed at the oil inlets and oil outlets of the lubricating oil tank and the mixing oil tank.

[0018] A method for supplying high-temperature, low-flow lubricating oil comprises the following steps:

[0019] Step 1: Constructing a lubricating oil flow path among the lubricating oil tank, the mixing oil tank, and the equipment, so that the lubricating oil flows through the lubricating oil tank, reaches the equipment, reaches the mixing oil tank after being used by the equipment, and then returns to the lubricating oil tank through the mixing oil tank;

[0020] Step 2: Diverting the flow of lubricating oil from the lubricating oil tank to the equipment, wherein the flow of the diverted first oil path is controlled and heated to meet the parameter requirements of the equipment;

[0021] Step 3: Divide the heated flow again into at least two oil routes, one of which has a low flow rate and is connected to the equipment with a minimum flow rate of 20ml / min; the other has a high flow rate and is directly connected to the mixing tank to reduce temperature loss;

[0022] Step 4: Based on step 2, the oil flow from the oil tank to the equipment is diverted so that the diverted second oil path is directly connected to the mixing tank, the oil flow on the diverted path is controlled, and the oil on the second oil path is cooled;

[0023] Step 5: Based on steps 2 and 4, introduce a relief valve and protect the oil circuits of steps 2 and 4 through the relief valve.

[0024] Beneficial effects:

[0025] 1. To overcome the problem of low flow rate supply and relatively large pipeline flow resistance, the defect of low pressure control accuracy of the oil supply system can be reduced by pressure control progress. For example, the defect of low pressure control accuracy of the oil supply system can be eliminated by frequency conversion control of the oil pump, fine-tuning valve and micro-pressure safety valve.

[0026] 2. The oil supply temperature is high. Within the maximum allowable operating temperature range of the lubricating oil, the temperature value can be remotely set by the host computer according to the actual temperature requirements of different products to ensure that different temperature requirements of the products are met.

[0027] 3. The oil supply flow is low. Within the minimum allowable working flow range of the lubricating oil, the flow value can be remotely set by the host computer according to the actual flow demand working conditions of different products to meet the different flow requirements of different products;

[0028] 4. Heat the lubricating oil on the path to overcome the effects of small oil flow and poor circulation in the tank; flow heating can stabilize the lubricating oil temperature within 300°C.

[0029] 5. The temperature loss of high-temperature lubricating oil in the pipeline is reduced. The main circuit flow is large, and the bypass flow is small and adjustable. Therefore, in actual use, the temperature drop of the entire circuit is small. At the same time, the circulation flow is large, so the temperature loss is small; further, the circulation flow is large and the temperature loss is small, and the temperature control is precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 It is a schematic diagram of a conventional scheme of the present invention.

[0032] The markings in the figure are: lubricating oil tank 1, mixing oil tank 2, first oil pump 3, second oil pump 4, first speed regulating valve 5, second speed regulating valve 6, third speed regulating valve 7, heater 8, cooler 9, first flow meter 10, second flow meter 11, first temperature sensor 12, first pressure sensor 13, second temperature sensor 14, second pressure sensor 15, filter 16, liquid level gauge 17, overflow valve 18, ball valve 19, sampling valve 20, and one-way valve 21. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] Example 1

[0035] Based on the problems mentioned in the background technology, this solution is Figure 2 For reference, the specific solutions of this application are as follows: Figure 1 As shown, it includes: a lubricating oil tank 1, a first oil pump 3, a second oil pump 4, a mixing tank 2, a first speed regulating valve 5, a third speed regulating valve 7, a heater 8, and numerous pipelines connecting the above equipment in series. The pipelines are conventional accessories and are not the core content of this application. Therefore, the assembly relationship between the pipelines and the various components will not be described in detail.

[0036] The connection relationship of the present application is that the oil inlet end of the first oil pump 3 is connected to the oil outlet of the lubricating oil tank 1, and the oil outlet end of the first oil pump 3 is connected to the first speed regulating valve 5. The first oil pump 3 provides power to draw lubricating oil from the lubricating oil tank 1 and limit the speed through the first speed regulating valve 5. The other end of the first speed regulating valve 5 is connected to the heater 8, and the lubricating oil on the path is heated by the heater 8. Unlike the conventional scheme, this embodiment heats the lubricating oil on the path. Compared with heating in a traditional oil tank, it effectively avoids the influence of temperature difference caused by small lubricating oil flow and poor circulation in the oil tank, and reduces temperature loss.

[0037] Another improvement of this embodiment is that the flow rate of the output end of the heater 8 is controlled, and at the same time, the output end of the heater 8 is connected to the input end of the equipment, and the output end of the equipment is connected to the mixing tank 2. The heated lubricating oil acts on the equipment and then flows into the mixing tank 2.

[0038] In this improved solution, two oil circuits are provided through the output of heater 8. One circuit connects to a second flowmeter 11, which can be a micro flowmeter. The output of second flowmeter 11 is connected to the equipment and equipped with a second temperature sensor 14 and a second pressure sensor 15. The micro flowmeter, second temperature sensor 14, and second pressure sensor 15 monitor the current parameters of the lubricating oil entering the equipment. These parameters are fed back to the higher-level system and controlled and adjusted via the first speed regulating valve 5, heater 8, third speed regulating valve 7, and first oil pump 3. The other circuit connects to the mixing tank 2 via the third speed regulating valve 7, which regulates the flow through the equipment.

[0039] Furthermore, the present application also uses a second oil pump 4, whose two ends are respectively connected to the mixing tank 2 and the oil tank, and controls the flow at both ends of the second oil pump 4. The specific setting is that a third ball valve 19 is installed between the oil inlet of the second oil pump 4 and the mixing tank 2, and a second ball valve 19 is installed between the output end of the third ball valve 19 and the lubricating oil tank 1.

[0040] The advantage here is that, if the main circuit flow is 5000ml / min and the bypass flow is adjustable from 20-3000ml / min, the temperature drop in the oil circuit will be small, the circulation flow will be large, and the temperature loss will be small; furthermore, the circulation flow will be large, the temperature loss will be small, and the temperature control will be precise.

[0041] For example, the temperature of 5000ml / min of 150-degree Celsius oil and 20ml / min of 150-degree Celsius oil after flowing through the same length and same size oil pipe is different. The temperature of 5000ml / min may be 145℃, while the temperature of 20ml / min may be only 80℃, or even lower.

[0042] Then the above scheme can control the temperature loss.

[0043] By setting the flow direction of the second oil pump 4 in opposite directions to that of the first oil pump 3 , a continuous supply of lubricating oil at a high temperature and a small flow rate to the equipment is achieved.

[0044] Another improvement of this solution is that a second oil circuit is set at the oil outlet end of the first oil pump 3 to divert and cool the oil. The second oil circuit is connected to the mixing oil tank 2, that is, the reduced lubricating oil flows into the mixing oil tank 2. The specific solution is that the second speed regulating valve 6 has a first end connected to the output end of the first oil pump 3, the oil inlet end of the cooler 9 is connected to the second end of the second speed regulating valve 6, and the oil outlet end of the cooler 9 is connected to the mixing oil tank 2.

[0045] Since the speed of the first oil pump 3 is relatively high and the pressure of the second oil circuit may be relatively high, a relief valve 18 is used for mediation protection. The oil inlet end of the relief valve 18 is connected to the output end of the first oil pump 3, and its oil outlet end is connected to the lubricating oil tank 1.

[0046] In this solution, a first pressure sensor 13 and a first temperature sensor 12 are provided at the oil outlet of the first oil pump 3 , and filters 16 are installed at the oil inlet and outlet of the lubricating oil tank 1 and the mixing oil tank.

[0047] A first speed regulating valve 5 is installed between the first oil pump 3 and the heater 8 . A first flow meter 10 is installed between the first speed regulating valve 5 and the heater 8 . The first flow meter 10 can be a gear flow meter.

[0048] A one-way valve 21 is installed between the first speed regulating valve 5 and the heater 8, and a lubricating oil tank 1 is installed. Filters 16 are installed at both the inlet and outlet ends of the lubricating oil tank 1, and an air filter 16 is installed. At the same time, a filter 16 is also installed at the oil outlet end of the first oil pump 3.

[0049] Furthermore, the lubricating oil tank 1 is provided with a liquid level gauge 17 .

[0050] Furthermore, a sampling valve 20 is installed in the lubricating oil tank 1 , and a sampling valve 20 is installed at the outlet end of the heater 8 .

[0051] In order to better illustrate this solution, this embodiment uses one of the implementation parameters to illustrate the technical principle:

[0052] The first oil pump 3 is controlled by a variable frequency motor, which is accurate to the single digit of the number of revolutions and can adjust the pump output displacement from 0.1 to 8.4 L / min.

[0053] In actual use, the fine-tuning valve, micro-pressure safety valve and equipment oil pipe adjust the oil flow rate to 20-1000mL / min, that is, Figure 1 The first oil pump 3, the first speed regulating valve 5 and the second speed regulating valve 6 control the equipment inlet pressure of 0-0.5MPa through the outlet fine-tuning valve. In order to prevent the temperature of the small flow lubricating oil from decreasing, the outlet flow is controlled at 20-1000mL / min, thereby ensuring that the equipment inlet oil temperature is controlled at room temperature-360℃.

[0054] For example, the main circuit flow rate is 5000ml / min, and the bypass flow rate is adjustable from 20-3000ml / min, with a wide flow range.

[0055] At the same time, a bypass branch is added to the equipment inlet, and the inlet nozzle diameter is set to 0.65mm. When the equipment inlet pressure is between 0 and 0.5MPa, the equipment inlet flow rate is controlled by pressure. The equipment inlet flow rate can be adjusted between 20 and 1000mL / min. The oil flow rate is measured by a micro flowmeter between 20 and 1000mL / min and the pressure is between 0 and 0.5MPa.

[0056] The second pressure sensor 15 and the second temperature sensor 14 are installed near the inlet of the equipment. The inlet and outlet of the equipment are connected with metal high-temperature hoses, and quick-connect connectors are used near the panel to facilitate rapid switching of oil circuits.

[0057] The system's heating and cooling oil circuit consists of a 15kW line heater 8 and a thyristor controller. Heater 8 can heat 0.1-3L / min oil to 360°C in 30 minutes. Due to its high flow rate, it is less prone to coking, with a control accuracy of ±2°C. The circuit is connected to the equipment inlet via a bypass branch.

[0058] A large flow of high-temperature lubricating oil is connected to the equipment inlet tee through a bypass branch and then returned to the oil tank, reducing the temperature loss of the high-temperature lubricating oil in the pipeline, thereby controlling the oil temperature of the equipment within ±2°C.

[0059] In reality, equipment requires high-temperature, low-flow lubricating oil. However, during the transmission process of high-temperature, low-flow lubricating oil in the pipeline, the temperature loss is relatively large. By the time the high-temperature, low-flow lubricating oil is discharged from the oil pump to the equipment, it is already low-temperature, low-flow lubricating oil. To solve this problem, the oil pump first outputs high-temperature, high-flow lubricating oil to the vicinity of the equipment, and then bypasses most of the high-flow lubricating oil back to the oil tank, so that the high-temperature, low-flow lubricating oil can be delivered to the equipment.

[0060] Example 2

[0061] Based on Example 1, this application also proposes a method for supplying high-temperature, low-flow lubricating oil, the specific steps of which are as follows:

[0062] Step 1: Construct the lubricating oil flow path of the lubricating oil tank 1, the mixing oil tank 2, and the equipment, so that the lubricating oil flows through the lubricating oil tank 1, reaches the equipment, reaches the mixing oil tank 2 after being used by the equipment, and returns to the lubricating oil tank 1 through the mixing oil tank 2;

[0063] Step 2: Divert the flow of lubricating oil from the lubricating oil tank 1 to the equipment, wherein the flow of the diverted first oil path is controlled and heated to meet the parameter requirements of the equipment;

[0064] Step 3: Divide the heated flow again into at least two oil paths, one of which has a low flow rate and is connected to the equipment; the other has a high flow rate and is directly connected to the oil mixing tank 2 to reduce temperature loss;

[0065] Step 4: Based on step 2, the oil flow from the oil tank 1 to the equipment is diverted so that the diverted second oil path is directly connected to the mixing tank 2. The oil flow on the diverted path is controlled, and the oil on the second oil path is cooled.

[0066] Step 5: Based on Step 2 and Step 4, introduce the relief valve 18, and protect the oil circuit of Step 2 and Step 4 through the relief valve 18. The specific implementation scheme is realized by Example 1.

[0067] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high-temperature, low-flow lubricating oil supply system, characterized in that: include: Lubricating oil tank, first oil pump, second oil pump, oil mixing tank, first speed regulating valve, heater; The first oil pump is used to connect the lubricating oil tank and the first speed regulating valve; the other end of the first speed regulating valve is connected to the heater; the output end of the heater is connected to the input end of the device; the output end of the device is connected to the mixing tank; the second oil pump is used to connect the mixing tank and the oil tank; The flow rate of the output end of the heater is controlled; the flow at both ends of the second oil pump is controlled; by setting the second oil pump and the first oil pump in opposite flow directions, continuous supply of lubricating oil to the equipment is achieved; a second oil circuit is set at the oil outlet end of the first oil pump for diversion and cooling, and the oil is connected to the mixing tank through the second oil circuit.

2. A high-temperature, low-flow lubricating oil supply system according to claim 1, characterized in that: A first flow meter is installed between the first speed regulating valve and the heater.

3. The high-temperature, low-flow lubricating oil supply system according to claim 1, characterized in that: At the same time, a one-way valve is installed between the first speed regulating valve and the heater.

4. The high-temperature, low-flow lubricating oil supply system according to claim 1, characterized in that: It also includes a third speed regulating valve. The output end of the heater is set with two routes, one of which is connected to the second flow meter; the output end of the second flow meter is connected to the equipment and is provided with a second temperature sensor and a second pressure sensor; the other route is connected to the mixing tank through the third speed regulating valve.

5. The high-temperature, low-flow lubricating oil supply system according to claim 1, characterized in that: A third ball valve is installed between the oil inlet of the second oil pump and the oil mixing tank, and a second ball valve is installed between the output end of the third ball valve and the lubricating oil tank.

6. The high-temperature, low-flow lubricating oil supply system according to claim 1, characterized in that: The second oil circuit includes: a second speed regulating valve, a first end of which is connected to the output end of the first oil pump; The cooler has an oil inlet end connected to the second end of the second speed regulating valve, and an oil outlet end connected to the oil mixing tank.

7. A high-temperature, low-flow lubricating oil supply system according to claim 6, characterized in that: It also includes a relief valve, the oil inlet end of the relief valve is connected to the output end of the first oil pump, and the oil outlet end of the relief valve is connected to the lubricating oil tank.

8. The high-temperature, low-flow lubricating oil supply system according to claim 1, characterized in that: A first pressure sensor and a first temperature sensor are provided at the oil outlet of the first oil pump.

9. The high-temperature, low-flow lubricating oil supply system according to claim 1, characterized in that: Filters are installed on the oil inlets and oil outlets of the lubricating oil tank and the mixed oil tank.

10. A method for supplying high-temperature, low-flow lubricating oil, characterized in that: The following steps are involved: Step 1: Constructing a lubricating oil flow path among the lubricating oil tank, the mixing oil tank, and the equipment, so that the lubricating oil flows through the lubricating oil tank, reaches the equipment, reaches the mixing oil tank after being used by the equipment, and then returns to the lubricating oil tank through the mixing oil tank; Step 2: Diverting the flow of lubricating oil from the lubricating oil tank to the equipment, wherein the flow of the diverted first oil path is controlled and heated to meet the parameter requirements of the equipment; Step 3: Divide the heated flow again into at least two oil routes, one of which has a low flow rate and is connected to the equipment with a minimum flow rate of 20ml / min; the other has a high flow rate and is directly connected to the mixing tank to reduce temperature loss; Step 4: Based on step 2, the oil flow from the oil tank to the equipment is diverted so that the diverted second oil path is directly connected to the mixing tank, the oil flow on the diverted path is controlled, and the oil on the second oil path is cooled; Step 5: Based on steps 2 and 4, introduce a relief valve and protect the oil circuits of steps 2 and 4 through the relief valve.

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