An oil supply system using an oil injector as a power source

Abstract

The present invention discloses an oil supply system with an oil injector as a power source, including an oil tank, a standby oil pump and a main oil pump, the standby oil pump and the main oil pump are connected in parallel, one end of the standby oil pump and the main oil pump are respectively connected to the oil tank, and the other end of the standby oil pump and the main oil pump form a merging point. The oil supply system with the oil injector as a power source also includes an oil injector, the oil injector is installed in the oil tank, the inlet of the oil injector is connected to the merging point, the outlet of the oil injector is connected to the lubrication system, the merging point is connected to the regulating oil system, and the oil is divided into two paths from the merging point, one path enters the regulating oil system, and the other path passes through the oil injector and the oil in the oil tank sucked by the oil injector and then flows into the lubrication system after mixing and reducing the pressure. Since the present invention introduces a set of injectors, when selecting an oil pump, the rated flow can be determined according to the sum of the regulating oil volume and the induced flow, which effectively reduces the flow when the oil pump is selected, and thus reduces the selection power of the motor, and reduces the energy consumption when the unit is running.

Description

Technical Field

[0001] The invention relates to an oil supply system, in particular to an oil supply system using an oil injector as a power source. Background Art

[0002] As an important equipment of steam turbine, the main function of oil supply system is to provide lubricating oil and regulating oil to steam turbine. Figure 1 As shown, a main oil pump 20 and a backup oil pump 30 are usually provided. After the oil in the oil tank 10 is pumped out by the oil pump and the oil pressure is adjusted, it enters the oil cooler 40 and the oil filter 50, and then is divided into two paths, one path of oil enters the bearing of the steam turbine unit to help lubricate and cool it and take away the friction heat; the other path enters the regulating oil system of the steam turbine.

[0003] In a typical oil supply system, the pressure of the regulating oil is generally higher than the pressure of the lubricating oil. Therefore, the flow rate of the oil pump is determined by the sum of the amount of lubricating oil and the amount of regulating oil, and the head selection is determined according to the higher pressure. The lubricating oil and the regulating oil share a duplex oil filter 50 and a duplex oil cooler 40. When the oil circuit at the outlet of the oil filter 50 is divided into two, they are connected to the regulating oil system and the lubricating oil system respectively. A throttle valve 60 is installed in the lubricating oil pipeline to convert the high-pressure oil into low-pressure oil and enter the lubricating oil system. In a typical steam turbine unit, the differential pressure here is between 0.7MPa and 1.5MPa, and there is a large throttling energy loss. The energy loss here means the reduction of the kinetic energy of the fluid. After the fluid is pressurized in the system, it is depressurized, and there is unnecessary energy waste in the process. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide an oil supply system using an oil injector as a power source which can reduce energy consumption.

[0005] One of the purposes of the present invention is achieved by the following technical solution:

[0006] A fuel supply system with an injector as a power source comprises a fuel tank, a standby fuel pump and a main fuel pump, wherein the standby fuel pump and the main fuel pump are connected in parallel, one end of the standby fuel pump and the main fuel pump are respectively connected to the fuel tank, and the other ends of the standby fuel pump and the main fuel pump form a merging point. The fuel supply system with an injector as a power source further comprises an injector, wherein the injector is installed in the fuel tank, an inlet of the injector is connected to the merging point, an outlet of the injector is connected to a lubrication system, and the merging point is connected to a regulating oil system. The oil is divided into two paths from the merging point, one path enters the regulating oil system, and the other path passes through the injector and the oil in the fuel tank sucked by the injector and is mixed with the oil and depressurized before flowing into the lubrication system.

[0007] Furthermore, the oil supply system with the injector as the power source also includes a regulating oil filter, one end of which is connected to the merging point, and the other end is connected to the regulating oil system. The oil flowing out from the merging point is filtered by the regulating oil filter and then flows into the regulating oil system.

[0008] Furthermore, the oil supply system using the oil injector as a power source also includes a lubricating oil filter, which is connected to the oil injector, and the oil flowing out of the oil injector flows into the lubrication system after being filtered by the lubricating oil filter.

[0009] Furthermore, the oil supply system using the oil injector as a power source also includes an oil cooler, which is communicated with the oil injector, and the oil flowing out of the oil injector flows into the lubrication system after being cooled by the oil cooler.

[0010] Furthermore, the oil cooler is located between the oil injector and the lubricating oil filter, and the oil flowing out of the oil injector is first cooled by the oil cooler, and then filtered by the lubricating oil filter before flowing into the lubrication system.

[0011] Furthermore, the power and flow rate of the main oil pump and the backup oil pump are the same.

[0012] Compared with the prior art, the oil supply system of the present invention, which uses the oil injector as the power source, introduces a set of injectors. When selecting the oil pump, the rated flow can be determined according to the sum of the regulated oil volume and the induced jet flow, which effectively reduces the flow when selecting the main oil pump and the standby oil pump, and thus reduces the selected power of the motor. When the pressure is still maintained at the pressure required for regulating the oil, the energy consumption of the unit during operation is reduced. When the injector is working, after the jet enters the injector, a partial vacuum is formed in the suction chamber, and the oil in the oil tank is sucked in and enters the throat of the injector together with the induced jet flow. In the throat, the working jet fully exchanges energy with the suction flow and continues to enter the diffuser. The dynamic pressure of the mixed flow is converted into the static pressure of the oil flow. The pressure at the outlet of the mixed flow of the injector minus the pressure loss of the oil cooler and the oil filter should be equal to the pressure of the lubricating oil, which effectively utilizes the loss caused by the original oil flow throttling and uses the loss caused by throttling as a power source. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the oil supply system in the background technology;

[0014] Figure 2 The diagram is a structural diagram of the oil supply system of the present invention using the oil injector as the power source.

[0015] In the figure: 10, oil tank; 20, main oil pump; 30, standby oil pump; 40, oil cooler; 50, oil filter; 51, lubricating oil filter; 52, regulating oil filter; 60, throttle valve; 70, injector. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0019] Figure 2 The oil supply system of the present invention uses the oil injector as a power source, and the oil supply system uses the oil injector as a power source includes an oil tank 10, a main oil pump 20, a backup oil pump 30, an oil cooler 40, a lubricating oil filter 51, a regulating oil filter 52 and an oil injector 70.

[0020] The oil tank 10 is used to store the medium (turbine oil). The main oil pump 20 cooperates with a drive motor to serve as the power source for the oil supply system when it is in normal use. The backup oil pump 30 cooperates with a drive motor to serve as the backup power source for the oil supply system when the main oil pump 20 fails. The main oil pump 20 and the backup oil pump 30 are of the same model. When selecting the oil pump, the rated flow can be determined based on the sum of the regulated oil volume and the injection flow, and the pressure still maintains the required pressure of the regulated oil. The internal structural dimensions of the injector 70 need to be specifically calculated and determined based on the pressure ratio and the flow ratio.

[0021] When assembling the oil supply system with the injector as the power source, the main oil pump 20 and the backup oil pump 30 are connected in parallel. One end of the main oil pump 20 is connected to the oil tank 10, and the other end forms a merging point with the output end of the backup oil pump 30. One end of the backup oil pump 30 is connected to the oil tank 10, and the other end forms a merging point with the output end of the main oil pump 20. The regulating oil filter 52 is connected to the merging point and is connected to the regulating oil system. The injector 70 is installed in the oil tank 10, and the bottom of the injector 70 is connected to the oil tank 10. The input end of the injector 70 is connected to the merging point, and the output end of the injector 70 is connected to the input end 40 of the oil cooler. The output end of the oil cooler 40 is connected to the input end of the lubricating oil filter 51, and the output end of the lubricating oil filter 51 is connected to the lubrication system.

[0022] When in use, the main oil pump 20 and the standby oil pump 30 are used as power sources. At the outlet of the pump merging point, the oil is divided into two paths. One path directly enters the regulating oil filter 52, and after being filtered by the regulating oil filter 52, it flows into the regulating oil system; the other path enters the injector 70 as injection oil. After the working jet of the injector 70 enters the injector 70, a partial vacuum is formed in the suction chamber, and the oil in the oil tank 10 is sucked into the injector 70 and enters the throat of the injector 70 together with the induced jet flow. In the throat, the working jet and the suction flow exchange energy fully, and continue to enter the diffuser. The dynamic pressure of the mixed flow is converted into the static pressure of the oil flow, and flows out from the outlet of the injector 70, and enters the oil cooler 40 and the lubricating oil filter 51 in turn, and then flows into the lubricating oil system. The pressure at the outlet of the mixed flow of the injector 70 minus the pressure loss of the oil cooler 40 and the lubricating oil filter 51 is equal to the pressure of the lubricating oil.

[0023] Compared with the prior art, the present invention divides the oil filter 50 into two groups of separate filters, and adds an oil injector 70 to replace the original throttle valve 60 (see Figure 1 ), effectively utilizing the loss caused by the original oil flow throttling, and taking the loss caused by the throttling as the power source, which is simple and convenient, and can effectively reduce the energy consumption of the unit without increasing the system cost.

[0024] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. An oil supply system with an oil injector as a power source, comprising an oil tank, a standby oil pump and a main oil pump, wherein the standby oil pump and the main oil pump are connected in parallel, one end of the standby oil pump and the main oil pump are respectively connected to the oil tank, and the other end of the standby oil pump and the main oil pump form a merging point, characterized in that: The oil supply system with the oil injector as the power source also includes an oil injector, which is installed in the oil tank, the inlet of the oil injector is connected to the merging point, the outlet of the oil injector is connected to the lubrication system, the merging point is connected to the regulating oil system, and the oil is divided into two paths from the merging point, one path enters the regulating oil system, and the other path passes through the oil injector and the oil in the oil tank sucked by the oil injector and then flows into the lubrication system after the pressure is reduced; Among them, the oil separated from the merging point enters the injector as injection oil. After the working jet of the injector enters the injector, a partial vacuum is formed in the suction chamber, and the oil in the oil tank is sucked into the injector and enters the throat of the injector together with the induced jet. In the throat, the working jet fully exchanges energy with the suction flow and continues to enter the diffuser. The dynamic pressure of the mixed flow is converted into the static pressure of the oil flow, which flows out from the injector outlet, enters the oil cooler and the lubricating oil filter in turn, and then flows into the lubricating oil system.

2. The oil supply system with an oil injector as a power source according to claim 1, characterized in that: The oil supply system with the injector as the power source also includes a regulating oil filter, one end of which is connected to the merging point, and the other end is connected to the regulating oil system. The oil flowing out of the merging point is filtered by the regulating oil filter and then flows into the regulating oil system.

3. The oil supply system with an oil injector as a power source according to claim 1, characterized in that: The power and flow rate of the main oil pump and the backup oil pump are the same.

Images