Side-mounted EH oil tank oil level monitoring system
By installing a magnetic float level gauge on one side of the EH oil tank, the oil level is monitored from the lower layer of EH oil using the principle of communicating vessels. Combined with a top float level gauge, the problems of easy jamming and false foaming of the top float level gauge are solved, thus achieving accuracy and safety in oil level monitoring.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2026-03-24
AI Technical Summary
In the existing EH oil tank level monitoring system, the top float-type level gauge is prone to jamming due to oil surface fluctuations and foam, making it impossible to accurately monitor the oil level and affecting the safe and stable operation of the unit.
A side-mounted level gauge is installed on one side of the oil tank. The magnetic float level gauge is used to introduce EH oil from the lower layer of the oil tank for monitoring through the principle of communicating vessels. It is combined with the top float level gauge to monitor the oil level and correct false information.
It effectively reduces the risk of jamming in top float-type level gauges, ensures the accuracy of oil level monitoring, avoids misleading information, and provides multiple safety guarantees.
Smart Images
Figure CN224034732U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of main oil tank level monitoring technology for steam turbine EH oil stations, and in particular to a side-mounted EH oil tank level monitoring system. Background Technology
[0002] The main oil tank level monitoring system for EH oil (triaryl phosphate fire-resistant oil) stations in thermal power plants uses a top float-type level gauge in its factory design. This type of level gauge has a circular data reading dial. When the oil level changes, the float floating on the surface of the oil tank rises and falls with the liquid level. The level gauge measures the actual oil level change in the tank by observing the change in the float's position relative to the float's cylinder wall. However, during the start-up, shutdown, or system testing of the EH oil system, the oil level in the tank changes frequently, and the oil surface may slosh during these changes. This can easily cause the float in the float-type level gauge to become misaligned and jammed against the float cylinder wall, resulting in no data display on the data reading dial and making it impossible to determine the true oil level in the tank. Given the characteristics of EH oil, it is very easy for EH oil to generate foam during actual operation of the unit. This foam is usually located at the oil surface, which can easily cause the float ball of the top float-type level gauge to move malfunction and generate false oil level information. This results in a large deviation between the oil level transmitted to the DCS and the actual local oil level, which has an adverse effect on the safe and stable operation of the unit. Utility Model Content
[0003] This application provides a side-mounted EH oil tank level monitoring system, which can effectively solve some problems existing in the current EH oil tank that only uses a top float-type level gauge to monitor its internal oil level.
[0004] The above-mentioned objective of this application is achieved through the following technical solution:
[0005] A side-mounted EH oil tank level monitoring system includes an oil tank filled with EH oil. A top float-type level gauge is installed on the top plate of the oil tank, with a float in the top float-type level gauge floating on the oil surface inside the tank. A side-mounted level gauge is installed on one side along the length of the oil tank.
[0006] The internal space of the side-mounted level gauge is connected to the space inside the oil tank;
[0007] The side-mounted level gauge can monitor the EH oil level in the tank by introducing a portion of the lower layer of EH oil from the tank.
[0008] Furthermore, the side-mounted level gauge is a magnetic float level gauge.
[0009] Furthermore, the magnetic level gauge has two flange interfaces spaced vertically on one side, and the oil tank has two mounting ports with flanges on one side along its length. The two flange interfaces on the magnetic level gauge and the mounting ports on the oil tank can be fixedly connected together by bolts and nuts, and the internal spaces of the magnetic level gauge and the oil tank can be connected after they are connected.
[0010] Furthermore, after the magnetic level gauge is connected to the oil tank through the two flange interfaces, the height of the flange interface located in the lower half of the magnetic level gauge is not higher than the minimum allowable liquid level in the oil tank, and the position of the flange interface located in the upper half of the magnetic level gauge is not lower than the maximum allowable liquid level in the oil tank.
[0011] Furthermore, the oil tank and the mounting port are connected by an extension pipe, and a shut-off valve is installed on the extension pipe.
[0012] Furthermore, the magnetic level gauge is equipped with an online remote transmission device.
[0013] Furthermore, a sampling and drain valve is provided at the lower end of the magnetic level gauge.
[0014] In summary, this application includes at least one of the following beneficial technical effects:
[0015] This application adds a side-mounted level gauge to one side of the oil tank. This side-mounted level gauge works by introducing a small amount of EH oil from the tank into itself. By monitoring the height of this portion of EH oil, the actual EH oil level in the tank can be determined in real time. Compared to a top float-type level gauge, the risk of jamming during use is effectively reduced. Thus, even if the top float-type level gauge at the top of the tank jams, the side-mounted level gauge can still promptly display the true oil level in the tank. Furthermore, the side-mounted level gauge obtains the monitoring sample from the lower layer of EH oil in the tank. Since the foam generated by EH oil is located above the oil surface, even if the float in the top float-type level gauge misaligns due to foam on the oil surface, producing false oil level information, the side-mounted level gauge can compare and correct this value, preventing monitoring personnel from being misled by false oil level information. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the overall structure of this application.
[0018] Attached reference numerals: 1. Oil tank; 2. Top float level gauge; 3. Magnetic level gauge; 4. Flange interface; 5. Mounting port; 6. Shut-off valve; 7. Sampling and drain valve. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.
[0020] like Figure 1 As shown, this application discloses a side-mounted EH oil tank level monitoring system, which includes an oil tank 1 filled with EH oil. A top float-type liquid level gauge 2 is installed on the top plate of the oil tank 1. The float in the top float-type liquid level gauge 2 floats on the oil surface in the oil tank 1. A side-mounted liquid level gauge is installed on one side of the oil tank 1 along its length.
[0021] The internal space of the side-mounted level gauge is connected to the space inside the oil tank 1;
[0022] The side-mounted level gauge can monitor the EH oil level in tank 1 by introducing a portion of the lower layer of EH oil from tank 1.
[0023] In the above embodiments, this application adds a side-mounted level gauge that communicates with the internal space of the oil tank 1 on one side, and retains the existing top float-type level gauge 2 on the top of the oil tank 1. By using two level gauges together to monitor the real oil level in the oil tank 1, an additional layer of safety can be provided compared to using only a single level gauge.
[0024] The side-mounted level gauge installed on one side of the oil tank 1 in this application, as described above, works by introducing a small amount of EH oil from the oil tank 1 into itself. Utilizing the principle of communicating vessels, it monitors the height of this portion of EH oil to provide real-time information on the specific oil level within the tank 1. Compared to the top float-type level gauge 2, the risk of jamming is significantly reduced. Even if the top float-type level gauge 2 at the top of the oil tank 1 jams, the side-mounted level gauge can still promptly display the true oil level in the tank 1. Furthermore, the side-mounted level gauge obtains the monitoring sample from the lower layer of EH oil in the oil tank 1. Since the foam generated by the EH oil is located above the oil surface, even if the float in the top float-type level gauge 2 misaligns due to oil surface foam, producing false oil level information, the side-mounted level gauge can compare and correct this value to prevent monitoring personnel from being misled by false oil level information.
[0025] Furthermore, such as Figure 1 As shown, the side-mounted level gauge is a magnetic float level gauge 3.
[0026] In the above embodiments, the magnetic float level gauge 3, also called a magnetic float column level gauge, mainly uses the principle of communicating vessels to measure the liquid level in the oil tank 1. After the magnetic float level gauge 3 is connected to the oil tank 1, when the liquid level of EH oil in the oil tank 1 rises or falls, the permanent magnet in the float of the magnetic float level gauge 3 transmits the signal to the magnetic float column indicator panel through magnetic coupling, causing the bicolor float column inside to rotate 180°. Taking the red and white bicolor float column as an example, when the oil level rises, the float column will flip from white to red, and when the oil level falls, the float column will flip from red to white. The boundary between red and white on the panel is the actual oil level height in the oil tank 1. In this way, the oil level inside the oil tank 1 can be monitored by diverting a small amount of EH oil from the outside of the oil tank 1 using the principle of communicating vessels.
[0027] Furthermore, such as Figure 1 As shown, the magnetic level gauge 3 has two flange interfaces 4 spaced vertically on one side, and two mounting ports 5 with flanges are pre-set on one side of the oil tank 1 along its length. The two flange interfaces 4 on the magnetic level gauge 3 and the mounting ports 5 on the oil tank 1 can be fixedly connected together by bolts and nuts. After the magnetic level gauge 3 and the oil tank 1 are connected together, their internal spaces can be connected.
[0028] In the above embodiments, the magnetic float level gauge 3 used in the side-mounted level gauge of this application is based on the principle of communicating vessels. The pipeline formed by connecting the lower side flange interface 4 to the corresponding mounting port 5 in the oil tank 1 naturally maintains the liquid levels inside and outside the oil tank 1 at the same height. This measurement method effectively avoids level deviations caused by density fluctuations or temperature changes. Since the liquid is introduced through a bottom pipeline, it also effectively avoids interference from foam on the oil surface on the measurement data. The connection between the upper side flange interface 4 of the magnetic float level gauge 3 and the corresponding mounting port 5 in the oil tank 1 allows the space above them to be connected, ensuring that the air pressure above the liquid level of the magnetic float level gauge 3 is consistent with the air pressure above the oil level in the oil tank 1 during operation.
[0029] Furthermore, such as Figure 1 As shown, after the magnetic level gauge 3 is connected to the oil tank 1 through two flange interfaces 4, the height of the flange interface 4 located in the lower half of the magnetic level gauge 3 is not higher than the minimum allowable liquid level height in the oil tank 1, and the position of the flange interface 4 located in the upper half of the magnetic level gauge 3 is not lower than the maximum allowable liquid level height in the oil tank 1.
[0030] In the above embodiments, the positions of the two flange interfaces 4 on the magnetic level gauge 3 of this application meet the above requirements, which can ensure that its measurement range can effectively cover the highest and lowest liquid levels in the oil tank 1 in actual use.
[0031] Furthermore, such as Figure 1 As shown, the oil tank 1 and the mounting port 5 are connected by an extension pipe, and a shut-off valve 6 is installed on the extension pipe.
[0032] In the above embodiments, the shut-off valve 6 is installed on the extension pipe between the oil tank 1 and the installation port 5. This makes it convenient for the staff to close the shut-off valve 6 when the magnetic float level gauge 3 needs to be replaced, so as to avoid unnecessary leakage of EH oil in the oil tank 1 during the replacement process.
[0033] Furthermore, an online remote transmission device is installed on the magnetic float level gauge 3.
[0034] In the above embodiments, the magnetic float level gauge 3 equipped with an online remote transmission device (i.e., a remote transmitter) is also called a remote magnetic float level gauge 3. When this type of magnetic float level gauge 3 is in use, the magnetic float moves up and down with the liquid level, driving the red and white magnetic flip columns inside the indicator panel outside the float to flip. Simultaneously, the reed switches inside the online remote transmission device are affected by the magnetic field inside the float, causing the reed switches connected in parallel between the resistors of the measuring element to sequentially engage or disengage. This causes the resistance of the series-connected resistor chain to increase or decrease. The mechanical signal is converted into an electrical signal output through a conversion module, thereby achieving remote display and control. To improve ease of use, an online remote transmission device can also be installed on the top float level gauge 2.
[0035] Furthermore, such as Figure 1 As shown, a sampling and drain valve 7 is installed at the lower end of the magnetic float level gauge 3.
[0036] In the above embodiments, the sampling and drain valve 7 located below the magnetic level gauge 3 not only facilitates the removal of dirt from inside the magnetic level gauge 3 during cleaning, but also allows for the sampling of oil from the tank 1 at any time when staff require EH oil quality testing, for subsequent analysis.
[0037] The implementation principle of this embodiment is as follows: The magnetic float level gauge 3 installed on one side of the oil tank 1 can work together with the original top float level gauge 2 to monitor the oil level in the oil tank 1. During normal use, the staff can obtain the oil level parameters in the oil tank 1 from both the top float level gauge 2 and the magnetic float level gauge 3. By analyzing and comparing the data from both, the staff can obtain more accurate and reliable information about the specific oil level in the oil tank 1. Especially during the start-up, shutdown, or system testing of the EH oil system, the oil level changes frequently. When the float in the top float-type level gauge 2 becomes misaligned due to fluctuations in the oil level inside the tank 1, causing it to jam against the float cylinder wall, the magnetic level gauge 3 added in this application, because it introduces a small amount of EH oil from the tank 1 into itself through the lower flange interface 4, uses the principle of communicating vessels to monitor the height of this portion of EH oil in real time to understand the specific oil level in the tank 1. Compared to the top float-type level gauge 2, the risk of jamming during use is effectively reduced. Thus, even if the top float-type level gauge 2 at the top of the tank 1 jams, the magnetic level gauge 3 of this application can still promptly display the true oil level in the tank 1. Alternatively, if foam on the oil surface in the tank 1 causes the float of the top float-type level gauge 2 to move erroneously, generating false oil level information, the magnetic level gauge 3 of this application, because it obtains an oil sample from the bottom of the EH oil tank, can also accurately display the oil level in the tank 1 in this situation. The magnetic level gauge 3 of this application is installed on the side of the oil tank 1, allowing inspection personnel to quickly obtain oil level information when they arrive at the oil tank 1. The top float level gauge 2 is located at the top of the oil tank 1, at a higher position. Inspection personnel can check the external magnetic level gauge 3 first, and then observe the oil level information measured on the top float level gauge 2, thus achieving multi-channel monitoring of the actual oil level in the oil tank 1, providing an additional layer of safety for actual production. Since this application uses two types of level gauges, when one needs to be replaced, the other level gauge can also serve as a temporary monitoring device, ensuring that oil level information in the oil tank 1 can be obtained at any time even during replacement. After applying the technical solution of this application to Units #1 and #2 of the applicant's thermal power plant, the problem of the top float level gauge 2 repeatedly jamming when monitoring the oil level in the main oil tank 1 of the EH oil station, preventing staff from timely obtaining the real-time oil level in the tank, has been effectively solved.
[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A side-mounted EH oil tank level monitoring system, comprising an oil tank (1) filled with EH oil, wherein a top float-type level gauge (2) is installed on the top plate of the oil tank (1), and a float ball in the top float-type level gauge (2) floats on the oil surface in the oil tank (1), characterized in that: A side-mounted level gauge is installed on one side of the oil tank (1) along its length. The internal space of the side-mounted level gauge is connected to the space inside the oil tank (1); The side-mounted level gauge can monitor the EH oil level in the oil tank (1) by introducing a portion of the lower layer of EH oil from the oil tank (1).
2. The side-mounted EH fuel tank level monitoring system according to claim 1, characterized in that: The side-mounted level gauge is a magnetic float level gauge (3).
3. The side-mounted EH fuel tank level monitoring system according to claim 2, characterized in that: The magnetic level gauge (3) has two flange interfaces (4) spaced vertically on one side. The oil tank (1) has two mounting ports (5) with flanges on one side along its length. The two flange interfaces (4) on the magnetic level gauge (3) and the mounting ports (5) on the oil tank (1) can be fixedly connected together by bolts and nuts. After the magnetic level gauge (3) and the oil tank (1) are connected together, their internal spaces can be connected.
4. The side-mounted EH fuel tank level monitoring system according to claim 3, characterized in that: After the magnetic level gauge (3) is connected to the oil tank (1) through the two flange interfaces (4), the height of the flange interface (4) located in the lower half of the magnetic level gauge (3) is not higher than the lowest allowable liquid level in the oil tank (1), and the position of the flange interface (4) located in the upper half of the magnetic level gauge (3) is not lower than the highest allowable liquid level in the oil tank (1).
5. The side-mounted EH fuel tank level monitoring system according to claim 3, characterized in that: The oil tank (1) and the mounting port (5) are connected by an extension pipe, and a shut-off valve (6) is installed on the extension pipe.
6. The side-mounted EH fuel tank level monitoring system according to any one of claims 2 to 5, characterized in that: The magnetic level gauge (3) is equipped with an online remote transmission device.
7. The side-mounted EH fuel tank level monitoring system according to any one of claims 2 to 5, characterized in that: The magnetic level gauge (3) is equipped with a sampling and drain valve (7) at its lower end.