A sealed oil temperature accurate regulation device

Abstract

The utility model discloses a sealed oil temperature accurate regulating device belongs to generator sealed oil temperature technical field. It includes three -way proportional regulating valve, and one of output ends is connected with sealed oil temperature regulating valve bypass valve, and another output end is connected with the isolation valve group, and three -way proportional regulating valve output is equipped with the cooling water flowmeter for detecting cooling flow, sealed oil cooler import isolation valve, sealed oil cooler import isolation valve input and sealed oil temperature regulating valve bypass valve and the output of isolation valve group are connected, and the output is connected with sealed oil cooler, sealed oil cooler output and sealed oil cooler export isolation valve are connected, this new type can effectively control sealed oil temperature in reasonable range, guarantee generator good lubrication and higher rotation efficiency.

Description

Technical Field

[0001] This utility model relates to a device for precisely regulating the temperature of sealing oil, belonging to the technical field of generator sealing oil temperature. Background Technology

[0002] The sealing oil is supplied to two annular oil distribution grooves on the shaft seal tile through two oil circuits on the air side and the hydrogen side. The oil flows out along the shaft axis through the gap between the inner diameter of the seal tile and the shaft.

[0003] The generator's sealing oil is cooled by a sealing oil cooler. Located within the sealing oil system, two sets are typically installed: one operational and one standby. Their function is to cool the sealing oil, removing heat generated by friction between the sealing pads and the shaft, ensuring that the pad and oil temperatures remain within a reasonable range. A regulating valve and a bypass valve are installed on the cooling water header for automatic adjustment of the sealing oil temperature.

[0004] As ambient temperature changes, the temperatures of the closed-loop cooling water and sealing oil also change accordingly. It's difficult to adjust the temperature of the closed-loop water, the sealing oil, and the opening of the temperature regulating valve. When the ambient temperature is low, the regulating valve opening is very small, resulting in large feedback fluctuations and causing fluctuations in the cooling water flow, making oil temperature control difficult and causing significant temperature fluctuations. To solve this problem, the common method is to throttle the cooling water flow by slightly closing the manual valves before and after the regulating valve. When the ambient temperature is high, the manual valves before and after the regulating valve are manually opened to control the cooling water flow into the system. However, this method requires production personnel to make frequent adjustments as the ambient and sealing oil temperatures fluctuate, resulting in a high workload.

[0005] Maintaining the sealing oil temperature within a specific range is difficult, requiring personnel to periodically adjust the throttle valve opening and know the exact current oil temperature. Furthermore, fluctuating oil temperature can cause significant fluctuations in the oil-hydrogen differential pressure, leading to sealing oil leakage from the generator and affecting the safe operation of the unit. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sealing oil temperature precision adjustment device. By adding a pneumatic three-way proportional adjustment valve, the sealing oil temperature is precisely adjusted to ensure stable oil-hydrogen differential pressure, ensure the sealing of gas inside the machine, and prevent sealing oil from leaking out of the generator.

[0007] To achieve the above objectives / to solve the above technical problems, this utility model adopts the following technical solution:

[0008] A device for precisely regulating the temperature of sealing oil, comprising:

[0009] A three-way proportional control valve has one output end connected to a sealing oil temperature regulating valve bypass valve and the other output end connected to an isolation valve group. The output end of the three-way proportional control valve is equipped with a cooling water flow meter for detecting cooling flow.

[0010] The sealing oil cooler inlet isolation valve has its input end connected to the output end of the sealing oil temperature regulating valve bypass valve and isolation valve group, and its output end connected to the sealing oil cooler. The output end of the sealing oil cooler is connected to the sealing oil cooler outlet isolation valve.

[0011] Optionally, the input end of the three-way proportional regulating valve is connected to a cooling source.

[0012] Optionally, a sealing oil temperature regulating flow valve is provided between the output end of the bypass valve of the sealing oil temperature regulating valve and the isolation valve group.

[0013] Optionally, the isolation valve group includes a sealing oil temperature regulating valve pre-isolation valve, a sealing oil temperature regulating valve, and a sealing oil temperature regulating valve post-isolation valve connected in series at the other output end of the three-way proportional regulating valve. The sealing oil temperature regulating valve post-isolation valve is connected to the input end of the sealing oil cooler inlet isolation valve.

[0014] Optionally, one end of the sealing oil temperature regulating flow valve is connected to the output end of the sealing oil temperature regulating valve bypass valve, and the other end is connected to the pipeline between the sealing oil temperature regulating valve and the sealing oil temperature regulating valve downstream isolation valve.

[0015] Optionally, at least two isolation valves are provided at the inlet of the sealing oil cooler, each connected to a sealing oil cooler.

[0016] Optionally, the two sealing oil coolers can serve as backups for each other during normal operation.

[0017] Optionally, both of the sealing oil coolers are equipped with a sealing oil cooler outlet isolation valve at their output ends.

[0018] Optionally, the cooling source may be a closed-loop water system.

[0019] Optionally, the cooling water flow meter is connected to the controller of the three-way proportional regulating valve, and the controller adjusts the opening of the three-way proportional regulating valve according to the sealing oil temperature information.

[0020] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0021] This invention can effectively control the sealing oil temperature within a reasonable range, ensuring good lubrication and high rotational efficiency of the generator;

[0022] This invention can extend the service life of generators, especially under conditions of extreme temperature changes, and prevent leakage of sealing oil.

[0023] This invention is simple to operate, safe and reliable, and requires no manual intervention.

[0024] This invention can be adjusted at any time according to different temperatures and different oil viscosities. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the present invention;

[0026] In the diagram: 1. Three-way proportional control valve; 2. Isolation valve before the sealing oil temperature control valve; 3. Sealing oil temperature control valve; 4. Isolation valve after the sealing oil temperature control valve; 5. Bypass valve for the sealing oil temperature control valve; 6. Sealing oil temperature control flow valve; 7. Cooling water flow meter; 8. Inlet isolation valve for the sealing oil cooler; 9. Outlet isolation valve for the sealing oil cooler. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] like Figure 1 As shown, a device for precisely regulating the temperature of sealing oil is disclosed, comprising:

[0030] A three-way proportional control valve 1 has one output connected to a sealing oil temperature regulating valve bypass valve 5, and the other output connected to an isolation valve group. The output of the three-way proportional control valve 1 is equipped with a cooling water flow meter 7 for detecting cooling flow. The cooling water flow meter 7 is connected to the controller of the three-way proportional control valve 1. The controller adjusts the opening of the three-way proportional control valve based on the sealing oil temperature information to finely adjust the cooling water flow. By combining a three-way proportional valve with the traditional method of using only a regulating valve for sealing oil cooling, the cooling water flow can be accurately and stably maintained at the target flow rate, solving the problem of large flow fluctuations and difficulty in precise control caused by the original method. When the sealing oil temperature is low, the sealing oil temperature regulating valve opens small, and the three-way proportional control valve performs the main regulation; when the oil temperature is high, the sealing oil temperature regulating valve opens larger to participate in the main regulation, and the three-way proportional control valve performs precise auxiliary adjustment. It uses a pneumatic three-way proportional control valve, which can accurately control the temperature of the sealing oil, observe and judge in real time, and control the opening of the three-way proportional control valve to achieve throttling regulation of the bypass.

[0031] A sealing oil cooler inlet isolation valve 8 is provided. The input end of the sealing oil cooler inlet isolation valve 8 is connected to the output end of the sealing oil temperature regulating valve bypass valve 5 and the isolation valve assembly. The output end of the sealing oil cooler is connected to the sealing oil cooler outlet isolation valve 9. A sealing oil temperature regulating flow valve 6 is provided between the output end of the sealing oil temperature regulating valve bypass valve 5 and the isolation valve assembly. The provision of a small flow regulating valve for sealing oil temperature addresses the problem of excessive flow when the ambient temperature is low.

[0032] The isolation valve group includes a sealing oil temperature regulating valve 2, a sealing oil temperature regulating valve 3, and a sealing oil temperature regulating valve 4 connected in series at the other output end of the three-way proportional regulating valve 1. The sealing oil temperature regulating valve 4 is connected to the input end of the sealing oil cooler inlet isolation valve 8. One end of the sealing oil temperature regulating flow valve 6 is connected to the output end of the sealing oil temperature regulating valve bypass valve 5, and the other end is connected to the pipeline between the sealing oil temperature regulating valve 3 and the sealing oil temperature regulating valve 4.

[0033] like Figure 1 As shown, at least two inlet isolation valves 8 of the sealing oil cooler are provided, each connected to a sealing oil cooler. Sealing oil coolers A and B are in a standby state for each other during normal operation. The output end of each of the two sealing oil coolers is provided with a sealing oil cooler outlet isolation valve 9.

[0034] like Figure 1As shown, the entire device is located on the 0-meter level of the turbine hall. The input end of the three-way proportional regulating valve 1 is connected to the cooling source. The cooling source is closed-loop water, which enters from 1-three-way proportional regulating valve, cools the sealing oil, and then flows out from 9-sealing oil cooler outlet isolation valve. Sealing oil coolers A and B are in a standby state for each other during normal operation.

[0035] The bypass valve 5 and the sealing oil temperature regulating flow valve 6 are normally closed or throttled. The cooling water flow meter 7 is located after the isolation valve following the sealing oil temperature regulating valve 4. The cooling water flow meter is connected to the controller of the three-way proportional regulating valve, which adjusts the opening of the three-way proportional regulating valve according to the sealing oil temperature information. This invention solves the problem of inaccurate cooling water flow in the sealing oil system, ensuring the normal operation of the sealing oil supply system under multiple working conditions.

[0036] In cold winters, the ambient temperature is low, the regulating valve opening is small, and the feedback fluctuation is large, causing periodic flow fluctuations in the cooling water. To improve the control accuracy of the cooling water flow, the sealing oil temperature regulating valve is used as a coarse adjustment. By adding a pneumatic three-way proportional regulating valve, the flow fluctuations caused by the regulating valve feedback can be further adjusted, thereby improving the control accuracy of the sealing oil temperature.

[0037] This invention effectively maintains stable oil-hydrogen differential pressure, prevents sealing oil leakage, protects unit safety, and prevents environmental pollution. It eliminates the need for frequent manual throttling at the site, resulting in low cost and reliable operation. The sealing oil temperature can be controlled within a narrow range, making it easy to operate and adaptable. Only a three-way proportional regulating valve is required, making the structure simple, maintenance convenient, and preventing water outages.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for precisely regulating the temperature of sealing oil, characterized in that, include: The three-way proportional control valve (1) has a sealing oil temperature regulating valve bypass valve (5) connected to one of its output ends, and an isolation valve group connected to the other output end. The output end of the three-way proportional control valve (1) is equipped with a cooling water flow meter (7) for detecting the cooling flow rate. The inlet isolation valve (8) of the sealing oil cooler is connected to the output end of the sealing oil temperature regulating valve bypass valve (5) and the isolation valve group, and the output end is connected to the sealing oil cooler. The output end of the sealing oil cooler is connected to the outlet isolation valve (9) of the sealing oil cooler.

2. The sealing oil temperature precise adjustment device according to claim 1, characterized in that, The input end of the three-way proportional regulating valve (1) is connected to a cooling source.

3. The sealing oil temperature precise adjustment device according to claim 1, characterized in that, A sealing oil temperature regulating flow valve (6) is provided between the output end of the bypass valve (5) of the sealing oil temperature regulating valve and the isolation valve group.

4. The sealing oil temperature precise adjustment device according to claim 3, characterized in that, The isolation valve group includes a sealing oil temperature regulating valve front isolation valve (2), a sealing oil temperature regulating valve (3), and a sealing oil temperature regulating valve rear isolation valve (4) connected in series at the other output end of the three-way proportional regulating valve (1). The sealing oil temperature regulating valve rear isolation valve (4) is connected to the input end of the sealing oil cooler inlet isolation valve (8).

5. The sealing oil temperature precise adjustment device according to claim 4, characterized in that, One end of the sealing oil temperature regulating flow valve (6) is connected to the output end of the sealing oil temperature regulating valve bypass valve (5), and the other end is connected to the pipeline between the sealing oil temperature regulating valve (3) and the sealing oil temperature regulating valve downstream isolation valve (4).

6. The sealing oil temperature precise adjustment device according to claim 1, characterized in that, The sealing oil cooler inlet isolation valve (8) is provided in at least two, each connected to a sealing oil cooler.

7. The sealing oil temperature precise adjustment device according to claim 6, characterized in that, The two sealing oil coolers are in a standby state for each other during normal operation.

8. The sealing oil temperature precise adjustment device according to claim 6, characterized in that, Both of the aforementioned sealing oil coolers are equipped with sealing oil cooler outlet isolation valves (9) at their output ends.

9. The sealing oil temperature precise adjustment device according to claim 2, characterized in that, The cooling source is a closed-loop water system.

10. The sealing oil temperature precise adjustment device according to claim 1, characterized in that, The cooling water flow meter (7) is connected to the controller of the three-way proportional regulating valve (1). The controller adjusts the opening of the three-way proportional regulating valve according to the sealing oil temperature information.

Images