Oil supplementing device for nuclear power station sealing oil vacuum pump

Abstract

The utility model is applicable to the field of nuclear power detection, and discloses an oil recharging device for a nuclear power station sealing oil vacuum pump, which comprises an oil recharging device for a nuclear power station sealing oil vacuum pump, comprising a machine shell arranged on a vacuum pump oil tank, a supply unit arranged in the machine shell and used for supplying liquid to the vacuum pump oil tank, an insulating pipeline connected with the supply unit and the vacuum pump oil tank and penetrating through the machine shell, and an oil storage unit for extracting liquid by the supply unit, the pressure control unit is arranged on the insulating pipeline and used for controlling the supply unit to output hydraulic pressure, and the main control unit is electrically connected with the supply unit and the pressure control unit. The machine shell is provided with a grounding wire used for eliminating static electricity. The machine shell is arranged on the vacuum pump oil tank, the supply unit can supply liquid in the oil storage unit into the vacuum pump oil tank, hydraulic pressure of the supply unit is adjusted through the pressure control unit to overcome air pressure in the vacuum pump oil tank, and online oil supplementing of the vacuum pump oil tank is achieved.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power detection, and in particular to an oil replenishment device for a vacuum pump for sealing oil in a nuclear power plant. Background Technology

[0002] The vacuum pump in a nuclear power plant turbine is a key component of the sealing oil system. Through functions such as degassing, dehydration, and maintaining negative pressure, it ensures the reliability of hydrogen sealing, oil stability, and safe operation of the unit. Its role directly affects the generator's explosion-proof safety, efficiency, and equipment lifespan.

[0003] The oil tank, a crucial component of the vacuum pump, requires 6 liters of lubricating oil. Lubricating oil serves not only as a sealing medium but also performs multiple functions, including lubrication, cooling, energy transfer, and impurity adsorption. Its core function is to achieve efficient gas extraction and compression through a dynamic oil ring system, while simultaneously ensuring the safe and stable operation of the equipment. The proper use and management of lubricating oil directly impacts the pump's efficiency, lifespan, and vacuum performance.

[0004] The existing oil replenishment technology has the following shortcomings: 1. When the vacuum pump is running, the oil tank is under positive pressure due to gas compression and sealing oil circulation. The pressure inside the vacuum pump oil tank is usually higher than the external atmospheric pressure. Conventional gravity oil replenishment methods cannot overcome the pressure difference between the inside and outside, making it difficult to inject lubricating oil; 2. Hydrogen gas mixed into the sealing oil system of the hydrogen-cooled generator will escape to the top space of the oil tank along with the oil gas. When the oil filling port is opened, the hydrogen gas mixes with the air, which can easily cause an explosion if it encounters static electricity or sparks; 3. After the vacuum pump is stopped for oil replenishment, the negative pressure of the sealing oil system is lost, which may lead to hydrogen leakage in the generator and a decrease in oil film stability, threatening the safety of the unit; frequent start-stop operations will also accelerate equipment wear and reduce production efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an oil replenishment device for a vacuum pump for sealing oil in nuclear power plants.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: Constructing an oil replenishment device for a vacuum pump for sealing oil in a nuclear power plant, comprising: a housing installed on the vacuum pump oil tank; a grounding wire for eliminating static electricity; a supply unit installed inside the housing for supplying liquid to the vacuum pump oil tank; an insulating pipe for connecting the supply unit and the vacuum pump oil tank and passing through the housing; an oil storage unit installed inside the housing and having liquid drawn from it by the supply unit; a pressure control unit installed on the insulating pipe for controlling the hydraulic pressure output by the supply unit; and a main control unit electrically connected to the supply unit and the pressure control unit.

[0007] In some embodiments, the pressure control unit includes: a pressure control valve disposed on the insulating pipe for regulating liquid pressure, and a pressure gauge disposed on the insulating pipe for detecting hydraulic pressure within the insulating pipe, wherein the pressure control valve and the pressure gauge are electrically connected to the main control unit.

[0008] In some embodiments, the oil storage unit is further provided with a first liquid level sensor for detecting the liquid level height within the oil storage unit.

[0009] In some embodiments, the oil storage unit includes a temperature sensor for detecting the liquid temperature, and the temperature sensor is electrically connected to the main control unit.

[0010] In some embodiments, the supply unit is a one-way gear pump.

[0011] In some embodiments, the insulated pipe is provided with a one-way valve to prevent liquid backflow.

[0012] In some embodiments, the flow detection unit is a digital flow meter.

[0013] In some embodiments, the oil storage unit is provided with a heating element for controlling the liquid temperature, and the heating element is electrically connected to the main control unit.

[0014] In some embodiments, a second liquid level sensor is provided inside the vacuum pump oil tank for detecting the liquid level inside the vacuum pump oil tank.

[0015] In some embodiments, the housing is further provided with a hydrogen detection sensor, which is connected to the main control unit.

[0016] The present invention provides an oil replenishment device for a vacuum pump for sealing oil in a nuclear power plant, which has the following advantages: the casing is mounted on the vacuum pump oil tank, and the supply unit can supply liquid from the oil storage unit to the vacuum pump oil tank. The pressure control unit adjusts the hydraulic pressure of the supply unit to overcome the gas pressure in the vacuum pump oil tank, thereby achieving online oil replenishment of the vacuum pump oil tank without stopping the vacuum pump. At the same time, because the casing eliminates static electricity in the entire device through a grounding wire, the hydrogen gas leaked during high-pressure oil replenishment will not cause an explosion due to static electricity. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0018] Figure 1 This is an overall connection diagram of an oil replenishment device for a nuclear power plant sealing oil vacuum pump according to one embodiment of the present invention.

[0019] Figure Labels

[0020] 1. Supply unit; 2. Insulated pipe; 3. Oil storage unit; 4. Pressure control unit; 5. First liquid level sensor; 6. Temperature sensor; 7. Pressure gauge; 8. Pressure control valve; 9. Flow detection unit; 10. Grounding wire; 11. Check valve; 12. Vacuum pump oil tank; 13. Second liquid level sensor; 14. Heating element. Detailed Implementation

[0021] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0022] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] Figure 1This invention illustrates an oil replenishment device for a vacuum pump used in a nuclear power plant sealing oil system, according to one embodiment of the present invention. This device can be used for online oil replenishment of the vacuum pump and includes a housing mounted on a vacuum pump oil tank 12; a grounding wire 10 for eliminating static electricity; a supply unit 1 located inside the housing for supplying liquid to the vacuum pump oil tank; an insulating pipe 2 connecting the supply unit 1 to the vacuum pump oil tank 12 and passing through the housing; an oil storage unit 3 located inside the housing and having liquid drawn from it by the supply unit 1; a pressure control unit 4 located on the insulating pipe 2 for controlling the hydraulic pressure output of the supply unit 1; and a main control unit electrically connected to the supply unit 1, the pressure control unit 4, and the flow detection unit 9.

[0024] The housing is mounted on the vacuum pump oil tank 12. The supply unit 1 can supply the liquid in the oil storage unit 3 to the vacuum pump oil tank 12. The pressure control unit 4 adjusts the hydraulic pressure of the supply unit 1 to overcome the air pressure in the vacuum pump oil tank 12, so as to realize online oil replenishment of the vacuum pump oil tank 12 without stopping the vacuum pump. At the same time, because the housing eliminates the static electricity of the entire device through the grounding wire 10, the hydrogen gas leaked during high-pressure oil replenishment will not cause an explosion due to static electricity.

[0025] Understandably, either the casing or the oil reservoir 3 can be grounded.

[0026] In one specific embodiment, the oil storage unit 3 is an oil tank, which is located inside the machine casing.

[0027] In one specific embodiment, the control unit is a PLC unit, which can control the pressure control unit 4 and the supply unit 1.

[0028] In one specific embodiment, the insulating pipe 2 is a flexible hose.

[0029] Figure 1 The pressure control unit 4, as shown in one embodiment, may include: a pressure control valve 8 disposed on the insulating pipe 2 for regulating liquid pressure, and a pressure gauge 7 disposed on the insulating pipe 2 for detecting hydraulic pressure within the insulating pipe 2. The pressure control valve 8 and the pressure gauge 7 are electrically connected to the control unit. The pressure gauge 7 can feed back real-time hydraulic data to the control unit, and the control unit adjusts the output hydraulic pressure of the pressure control valve 8 in real time based on the data from the pressure gauge 7.

[0030] In one specific embodiment, the pressure gauge 7 can directly feed back specific hydraulic data to the user, who can then adjust the hydraulic pressure output by the pressure control valve 8.

[0031] In one specific embodiment, the pressure control valve 8 is an overflow valve, which can smoothly output the corresponding hydraulic pressure, and the liquid exceeding the hydraulic pressure will flow back into the oil storage unit 3.

[0032] Figure 1 In one embodiment, the first shielding unit may include an oil storage unit 3 and a first liquid level sensor 5 for detecting the liquid level in the oil storage unit 3. The first liquid level sensor 5 can detect the liquid level in the oil storage unit 3 and then feed it back to the control unit. The control unit will stop the supply unit 1 from continuing to supply liquid to the vacuum pump oil tank 12.

[0033] Figure 1 The first shielding unit is shown in one embodiment to include an oil storage unit 3 containing a temperature sensor 6 for detecting the liquid temperature. The temperature sensor 6 is electrically connected to the control unit. Because the density and viscosity of oil are different at different temperatures, the control unit adjusts the pressure of the pressure control unit 4 and the supply flow of the supply unit 1 in real time based on the temperature data fed back by the temperature sensor 6.

[0034] Figure 1 The first shielding unit is shown to include, in one embodiment, a supply unit 1 which is a one-way gear pump. The one-way gear pump has the following advantages: simple and compact structure, small size, light weight, good manufacturability, low price, strong self-priming force, insensitivity to oil contamination, large speed range, ability to withstand impact loads, convenient maintenance, and reliable operation.

[0035] Figure 1 The first shielding unit, as shown in one embodiment, may include a one-way valve 11 on the insulating pipe 2 to prevent liquid backflow. Because the air pressure in the vacuum pump tank 12 is relatively high, when the supply device stops operating, liquid is likely to backflow into the insulating pipe 2 and even into the supply device. Therefore, the one-way valve 11 can prevent this from happening.

[0036] Figure 1 The first shielding unit is shown in one embodiment to include an insulating pipe 2 with a flow detection unit 9 for detecting liquid flow. The flow detection unit 9 is a digital flow meter. The digital flow meter can feed back data to the control unit, and it is also convenient for the user to directly observe the flow data. The control unit can control the flow of the supply unit 1 according to the fed-back flow data.

[0037] Figure 1 The first shielding unit is shown in one embodiment to include an oil storage unit 3 with a heating element 14 inside for controlling the liquid temperature. The heating element is electrically connected to the control unit. The liquid in the oil storage unit 3 is heated by the heating element 14 to maintain a certain temperature, so as to avoid the supply unit 1 providing different liquid flow rates due to the large difference in oil temperature before and after.

[0038] Figure 1In one embodiment, the first shielding unit may include a second liquid level sensor 13 inside the vacuum pump oil tank 12 for detecting the liquid level inside the vacuum pump oil tank 12. The second liquid level sensor 13 can detect the liquid level inside the vacuum pump oil tank 12 and then feed it back to the control unit, which controls whether the supply unit 1 is filled with oil.

[0039] Figure 1 The first shielding unit, as shown in one embodiment, may include a hydrogen detection sensor mounted on the housing. The hydrogen detection sensor is connected to the control unit and can detect whether the hydrogen content exceeds a certain level. If it does, an alarm will be triggered.

[0040] Understandably, the hydrogen detection sensor detects a hydrogen concentration far lower than the proportion of hydrogen mixed with air that could explode. Therefore, the hydrogen detection sensor can effectively reduce the probability of an explosion when hydrogen is mixed with air.

[0041] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. An oil replenishment device for a vacuum pump used in a nuclear power plant's sealing oil, characterized in that, include: The system includes a housing mounted on the vacuum pump oil tank (12), a grounding wire (10) for eliminating static electricity, a supply unit (1) located inside the housing for supplying liquid to the vacuum pump oil tank, an insulating pipe (2) for connecting the supply unit (1) and the vacuum pump oil tank (12) and passing through the housing, an oil storage unit (3) located inside the housing and having liquid drawn by the supply unit (1), a pressure control unit (4) located on the insulating pipe (2) for controlling the hydraulic pressure output of the supply unit (1), and a main control unit electrically connected to the supply unit (1) and the pressure control unit (4).

2. The oil replenishment device for a nuclear power plant sealing oil vacuum pump according to claim 1, characterized in that, The pressure control unit (4) includes: a pressure control valve (8) disposed on the insulating pipe (2) for adjusting the liquid pressure, and a pressure gauge (7) disposed on the insulating pipe (2) for detecting the hydraulic pressure in the insulating pipe (2). The pressure control valve (8) and the pressure gauge (7) are electrically connected to the main control unit.

3. The oil replenishment device for a nuclear power plant sealing oil vacuum pump according to claim 1, characterized in that, The oil storage unit (3) is also equipped with a first liquid level sensor (5) for detecting the liquid level height inside the oil storage unit (3).

4. The oil replenishment device for a nuclear power plant sealing oil vacuum pump according to claim 1, characterized in that, The oil storage unit (3) includes a temperature sensor (6) for detecting the liquid temperature, and the temperature sensor (6) is electrically connected to the main control unit.

5. The oil replenishment device for a nuclear power plant sealing oil vacuum pump according to claim 1, characterized in that, The supply unit (1) is a one-way gear pump.

6. The oil replenishment device for a nuclear power plant sealing oil vacuum pump according to claim 1, characterized in that, The insulating pipe (2) is equipped with a one-way valve (11) to prevent liquid backflow.

7. The oil replenishment device for a nuclear power plant sealing oil vacuum pump according to claim 1, characterized in that, The insulated pipe (2) is equipped with a flow detection unit (9) for detecting liquid flow rate, and the flow detection unit (9) is a digital flow meter.

8. The oil replenishment device for a nuclear power plant sealing oil vacuum pump according to claim 1, characterized in that, The oil storage unit (3) is equipped with a heating element (14) for controlling the liquid temperature, and the heating element (14) is electrically connected to the main control unit.

9. The oil replenishment device for a nuclear power plant sealing oil vacuum pump according to claim 1, characterized in that, A second liquid level sensor (13) is provided inside the vacuum pump oil tank (12) for detecting the liquid level inside the vacuum pump oil tank (12).

10. The oil replenishment device for a nuclear power plant sealing oil vacuum pump according to claim 1, characterized in that, The casing is also equipped with a hydrogen detection sensor, which is connected to the main control unit.

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