Oil tank for steam turbine lubricating oil system

Abstract

An oil tank for a steam turbine lubricating oil system comprises a box body, a partition is arranged in the box body, the partition divides the inside of the box body into a buffer chamber and an oil storage chamber, the buffer chamber is located above the partition, and the oil storage chamber is located below the partition; a through oil inlet and an oil outlet are provided on the partition; an oil return pipe is provided in the oil storage chamber, and a through oil return port is provided on the side wall of the box body; the outlet of the oil return pipe is connected to the oil inlet, and the inlet of the oil return pipe is connected to the oil return port; the oil return port is located below the partition; a filter device is provided at the oil outlet; the buffer chamber is connected to the oil storage chamber through the filter device; buffer oil is stored in the buffer chamber, and there is a gap between the liquid level of the buffer oil and the top surface of the box body. The oil tank can effectively decelerate the lubricating oil coming out of the steam turbine when the deceleration device cannot be installed outside the box body, thereby reducing the generation of oil mist and bubbles, avoiding damage to the filter screen, and can quickly eliminate bubbles in the oil to ensure the precipitation of impurities.

Description

Technical Field

[0001] The invention relates to the field of steam turbines, in particular to an oil tank used in a steam turbine lubricating oil system. Background Art

[0002] When the steam turbine is working, lubricating oil needs to be provided to form a continuous oil film between the bearing and the gearbox to protect the normal operation of the bearing. Only a small amount of lubricating oil is needed to form the oil film, but the bearing will generate a lot of heat during operation. In order to ensure that the bearing can operate at a normal temperature, a large amount of lubricating oil needs to be provided to cool the bearing, which requires the use of the steam turbine lubricating oil system.

[0003] A key component of the steam turbine lubricating oil system is the oil tank. The existing oil tank structure is as follows: Figure 1 As shown, it includes a box body 4 and an oil return tank 2 and a filter device 3 arranged in the box body 4; the oil return tank 2 is arranged at the top of the box body 4, and an oil return port 1 is opened at the top of the box body 4, and the oil return port 1 is communicated with the inside of the oil return tank 2, and the filter device 3 is arranged at the bottom of the oil return tank 2, and the oil return tank 2 is communicated with the internal space of the box body 4 through the filter device 3; the filter device 3 is aligned with the oil return port 1 up and down. When working, the lubricating oil from the steam turbine enters the oil return tank 2 through the oil return port 1, and then the oil flows into the box body 4 after being filtered by the filter device 3, and the impurities are deposited in the oil return tank 2.

[0004] The existing fuel tank structure has the following deficiencies:

[0005] 1. Accelerate the consumption rate of lubricating oil. The flow rate of lubricating oil coming out of the turbine is 1.2~1.6m / s, which is a relatively high flow rate. After the high-flow lubricating oil enters the oil return port, it will impact the bottom of the return oil tank and the filter device. During the impact, the oil will splash and produce oil mist, increasing the oil mist concentration in the entire oil tank; as the oil mist concentration increases, the de-oiling mist device on the oil tank will extract more oil mist, resulting in faster consumption of the lubricating oil.

[0006] 2. Generate a large number of bubbles. When high-speed lubricating oil impacts the bottom of the oil return tank and the filter device, a large number of bubbles will be generated. The bubbles increase the contact area between the lubricating oil and oxygen, accelerate the oxidation of the lubricating oil, and make it lose its original performance. The heat dissipation performance of the oxidized lubricating oil decreases, destroying the formation of the lubricating oil film and weakening the ability to protect the equipment. Under high pressure, the bursting of bubbles produces instantaneous impact force and high temperature, causing cavitation damage to the metal surface. Long-term accumulation may cause damage to key parts of the equipment. Bubbles cause the lubrication system to be unstable, causing the equipment to vibrate and make noise, affecting smooth operation. Bubbles affect the fluidity and lubrication effect of the lubricating oil, reducing the operating efficiency and service life of the equipment.

[0007] 3. If the flow rate is too high, the lubricating oil will stay in the oil return tank and the box for a shorter time, resulting in insufficient precipitation of impurities and insufficient release of bubbles, which will affect the cooling and lubrication effects. At the same time, if the flow rate is too high, it will impact the filter in the filter device, causing damage to the filter.

[0008] 4. The bubbles in the oil are removed by natural floating, that is, the bubbles use buoyancy to rise to the oil surface and merge into the air. If the oil does not move upward, the bubbles are completely eliminated by their own buoyancy to overcome the friction resistance of the oil and move upward, and the effect is poor.

[0009] In the existing use environment, due to the limited space outside the box, it is impossible to install a deceleration device outside the box to decelerate the lubricating oil. Therefore, it is particularly necessary to design a new oil tank to solve the above problems. Summary of the invention

[0010] The purpose of the present invention is to provide an oil tank for a turbine lubricating oil system in response to the above-mentioned problems. The oil tank can effectively reduce the speed of the lubricating oil coming out of the turbine when a deceleration device cannot be installed outside the tank body, thereby reducing the generation of oil mist and bubbles, avoiding damage to the filter, and can quickly eliminate bubbles in the oil to ensure the precipitation of impurities.

[0011] The technical solution adopted by the present invention is as follows:

[0012] A oil tank for a turbine lubricating oil system, comprising a tank body, wherein a partition is arranged in the tank body, wherein the partition divides the interior of the tank body into a buffer chamber and an oil storage chamber, wherein the buffer chamber is located above the partition, and the oil storage chamber is located below the partition; a through oil inlet and an oil outlet are provided on the partition; an oil return pipe is provided in the oil storage chamber, and a through oil return port is provided on the side wall of the tank body; the outlet of the oil return pipe is connected to the oil inlet, and the inlet of the oil return pipe is connected to the oil return port; the oil return port is located below the partition; a filtering device is provided at the oil outlet; the buffer chamber is connected to the oil storage chamber through the filtering device; buffer oil is stored in the buffer chamber, and there is a gap between the liquid level of the buffer oil and the top surface of the tank body.

[0013] Furthermore, the oil return port is close to the bottom of the oil storage cavity.

[0014] Furthermore, the box body is a cube or a rectangular parallelepiped; the partition includes a horizontal partition board 1, a connecting board and a horizontal partition board 2; from the left end to the right end of the box body, the horizontal partition board 1, the connecting board and the horizontal partition board 2 are connected in sequence; the left end of the horizontal partition board 1 is connected to the left side wall of the box body, the front end of the horizontal partition board 1 is connected to the front side wall of the box body, and the rear end of the horizontal partition board 1 is connected to the rear side wall of the box body; the right end of the horizontal partition board 2 is connected to the right side wall of the box body, the front end of the horizontal partition board 2 is connected to the front side wall of the box body, and the rear end of the horizontal partition board 2 is connected to the The end is connected to the rear side wall of the box body; the horizontal partition one is located above the horizontal partition two; the oil inlet is opened on the horizontal partition two, and the oil outlet is opened on the horizontal partition one; the connecting plate is inclined so that the angle formed by the upper surface of the connecting plate and the upper surface of the horizontal partition two is greater than 90°, the left end of the connecting plate is connected to the right end of the horizontal partition one, the right end of the connecting plate is connected to the left end of the horizontal partition two, the front end of the connecting plate is connected to the front side wall of the box body, and the rear end of the connecting plate is connected to the rear side wall of the box body.

[0015] Furthermore, from the left end to the right end of the box body, the projection length of the second horizontal partition on the horizontal plane is respectively greater than or equal to the projection length of the connecting plate and the first horizontal partition on the horizontal plane.

[0016] Furthermore, the oil inlet is close to the right side wall of the box body, and the oil outlet is close to the left side wall of the box body.

[0017] Furthermore, the angle formed by the upper surface of the connecting plate and the upper surface of the second horizontal partition is 150° to 170°.

[0018] Furthermore, the height difference between the upper surface of the horizontal partition 1 and the upper surface of the horizontal partition 2 is greater than or equal to 0.1 m.

[0019] Furthermore, the distance from the liquid surface of the buffer oil to the horizontal partition 1 is greater than or equal to 0.3 m.

[0020] Furthermore, the gap between the liquid surface of the buffer oil and the top surface of the box body is greater than or equal to 0.1m.

[0021] Furthermore, an air pressure regulating hole is opened on the top of the box body, the air pressure regulating hole is communicated with the buffer chamber, and an air pump is arranged at the air pressure regulating hole.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] The lubricating oil from the steam turbine flows upward after entering the oil return port, and mixes with the buffer oil in the buffer chamber after passing through the oil inlet, which can slow down the lubricating oil. The speed of the lubricating oil is reduced, which avoids splashing, reduces the generation of oil mist and bubbles, and can also prevent the filter from being damaged. The slowing down of the oil flow rate can ensure that the impurities in the oil are fully precipitated.

[0024] The oil inlet and the oil outlet are not directly aligned vertically, which prevents the oil from directly impacting the filter device.

[0025] As the lubricating oil flows upward, it will carry the bubbles in the oil with it. Because the density of bubbles is lower than that of oil, the bubbles will naturally rise upward. The upward flow of lubricating oil can provide kinetic energy for the bubbles, allowing them to reach the liquid surface of the buffer oil faster. Once the bubbles reach the liquid surface, they will burst and merge into the air, thereby reducing the bubble content in the lubricating oil.

[0026] A partition is added inside the box to divide the box into a buffer chamber and an oil storage chamber, so that the buffer chamber is located inside the box, thereby slowing down the oil flow rate and solving the problem that the existing space outside the box is limited and it is impossible to add a deceleration device.

[0027] At the same time, since the buffer chamber and the oil storage chamber are interconnected, adding a partition does not change the overall capacity of the entire oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a prior art structure diagram;

[0029] Figure 2 A perspective view of the present invention;

[0030] Figure 3 It is a front view of the present invention;

[0031] In the figure, 1-oil return port, 2-oil return tank, 3-filter device, 4-tank, 5-oil inlet, 6-partition, 601-horizontal partition one, 602-connecting plate, 603-horizontal partition two, 7-oil return pipe, 8-oil outlet, 9-buffer chamber, 10-oil storage chamber. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] like Figure 2 and 3As shown, the present invention discloses an oil tank for a steam turbine lubricating oil system, which comprises a box body 4, wherein a partition 6 is arranged inside the box body 4, wherein the partition 6 divides the interior of the box body 4 into a buffer chamber 9 and an oil storage chamber 10, wherein the buffer chamber 9 is located above the partition 6, and the oil storage chamber 10 is located below the partition 6; a through oil inlet 5 and an oil outlet 8 are provided on the partition 6; an oil return pipe 7 is arranged inside the oil storage chamber 10, and a through oil return port is provided on the side wall of the box body 4; the outlet of the oil return pipe 7 is communicated with the oil inlet 5, and the inlet of the oil return pipe 7 is communicated with the oil return port; The oil port is located below the partition 6; a filter device 3 is provided at the oil outlet 8; the buffer chamber 9 is connected to the oil storage chamber 10 through the filter device 3; buffer oil is stored in the buffer chamber 9, and there is a gap between the liquid level of the buffer oil and the top surface of the box body 4; the lubricating oil coming out of the steam turbine flows upward after entering the oil return port, and mixes with the buffer oil in the buffer chamber 9 after passing through the oil inlet 5, so that the flow rate of the lubricating oil is reduced and then flows out from the oil outlet 8; the lubricating oil flows upward, so that the bubbles carried in the lubricating oil are sent to the buffer oil liquid level; the buffer oil and the lubricating oil coming out of the steam turbine are the same oil.

[0039] The oil return port is located below the partition 6, the outlet of the oil return pipe 7 is connected to the oil inlet 5, and the inlet of the oil return pipe 7 is connected to the oil return port opened on the side wall of the box body 4, which shows that the oil return pipe 7 is an upward curved pipe. Figure 2 As shown, the oil return pipe 7 is an upwardly curved pipe, the upper outlet of the oil return pipe 7 is connected to the oil inlet 5, and the lower inlet of the oil return pipe 7 is connected to the oil return port opened on the front side wall of the box body. Figure 2 In the figure, the front side wall, the right side wall and the oil return port of the box body 4 are not drawn.

[0040] Since the oil return pipe 7 is an upward curved pipe, the lubricating oil from the steam turbine can be decelerated once when passing through the bend. When the lubricating oil moves upward, it can overcome the gravity potential energy and decelerate again. When the lubricating oil enters the buffer chamber 9, the lubricating oil can be decelerated again because the buffer chamber 9 has a large area and is mixed with the buffer oil. The speed of the lubricating oil is reduced and it flows upward, which avoids impact on the partition 6 and the filter device 3, avoids splashing, reduces the generation of oil mist and bubbles, and avoids damage to the filter.

[0041] The oil inlet 5 and the oil outlet 8 are not directly aligned vertically, so that the oil is prevented from directly impacting the filter device 3 .

[0042] The lubricating oil enters the buffer chamber 9 from the bottom of the buffer chamber 9. When the lubricating oil flows upward, it will carry the bubbles in the oil upward. Because the density of the bubbles is lower than that of the oil, the bubbles will naturally rise upward. The upward flow of the lubricating oil can provide kinetic energy for the bubbles, so that the bubbles can reach the liquid surface of the buffer oil faster. Once the bubbles reach the liquid surface, they will burst and merge into the air, thereby reducing the bubble content in the lubricating oil.

[0043] The present invention adds a partition 6 in the box body 4 to divide the box body 4 into a buffer chamber 9 and an oil storage chamber 10, so that the buffer chamber 9 is located in the box body 4, thereby slowing down the flow rate of the oil, solving the problem that the space outside the existing box body 4 is limited and it is impossible to add a deceleration device. At the same time, since the buffer chamber 9 and the oil storage chamber 10 are interconnected, adding the partition 6 does not change the overall capacity of the entire oil tank.

[0044] Furthermore, the oil return port is close to the bottom of the oil storage chamber 10. This allows the lubricating oil to rise a longer distance, thereby overcoming more gravitational potential energy and ensuring a deceleration effect.

[0045] The box body 4 is a cube or a cuboid; in the present invention, Figure 2 As shown, the box body 4 is a rectangular parallelepiped. Figure 2 In the figure, the front side wall and the right side wall of the box body 4 are not drawn.

[0046] like Figure 2 and 3 As shown, the partition 6 includes a horizontal partition 1 601, a connecting plate 602 and a horizontal partition 2 603; from the left end to the right end of the box body 4, the horizontal partition 1 601, the connecting plate 602 and the horizontal partition 2 603 are connected in sequence;

[0047] The horizontal partition 1 601 is located at the left end of the box body 4, the left end of the horizontal partition 1 601 is connected to the left side wall of the box body 4, the front end of the horizontal partition 1 601 is connected to the front side wall of the box body 4, and the rear end of the horizontal partition 1 601 is connected to the rear side wall of the box body 4;

[0048] The second horizontal partition 603 is located at the right end of the box body 4, the right end of the second horizontal partition 603 is connected to the right side wall of the box body 4, the front end of the second horizontal partition 603 is connected to the front side wall of the box body 4, and the rear end of the second horizontal partition 603 is connected to the rear side wall of the box body 4;

[0049] The horizontal partition 1 601 is located above the horizontal partition 2 603; the oil inlet 5 is opened on the horizontal partition 2 603, and the oil outlet 8 is opened on the horizontal partition 1 601;

[0050] The connecting plate 602 is tilted so that the angle formed by the upper surface of the connecting plate 602 and the upper surface of the horizontal partition plate 603 is greater than 90°, the left end of the connecting plate 602 is connected to the right end of the horizontal partition plate 1 601, the right end of the connecting plate 602 is connected to the left end of the horizontal partition plate 2 603, the front end of the connecting plate 602 is connected to the front side wall of the box body 4, and the rear end of the connecting plate 602 is connected to the rear side wall of the box body 4.

[0051] Due to the above structure, in the buffer chamber 9, the lubricating oil flows from right to left. Since the horizontal partition 1 601 is located above the horizontal partition 2 603, the bottom of the buffer chamber 9 is rising from the right end to the left end of the buffer chamber 9 and has a certain slope, which can further slow down the oil flow rate.

[0052] At the same time, the connecting plate 602, the second horizontal partition 603, the rear side wall of the box body 4, the front side wall of the box body 4 and the right side wall of the box body 4 together form an oil storage tank with an open top and a larger top and a smaller bottom. When the lubricating oil level in the oil storage chamber 10 is lower than the horizontal partition 1 601, a certain amount of buffer oil can still exist in the oil storage tank.

[0053] If the partition 6 is a horizontal plate, there will be no oil storage tank. When the lubricating oil level in the oil storage chamber 10 is lower than the horizontal plate, the entire buffer chamber 9 cannot store buffer oil. The buffer oil will all flow into the oil storage chamber 10 from the oil outlet 8. If the lubricating oil enters the oil inlet 5 at this time, the deceleration effect of the lubricating oil is weak. However, when there is an oil storage tank, the lubricating oil entering the oil inlet 5 can also be mixed with the buffer oil in the storage tank, thereby ensuring the deceleration effect. In order to ensure that the buffer oil can be stored in the oil storage tank and prevent the buffer oil from flowing out of the oil return port, a valve can be set at the outlet or inlet of the oil return pipe 7.

[0054] In specific implementation, the angle formed by the upper surface of the connecting plate 602 and the upper surface of the horizontal partition 603 is 150°~170°; the height difference between the upper surface of the horizontal partition 1 601 and the upper surface of the horizontal partition 2 603 is greater than or equal to 0.1m, preferably 0.1~0.3m.

[0055] In order to ensure the deceleration effect and ensure that the oil can flow normally, the oil storage tank can store a certain amount of buffer oil. When the angle is 150°~170° and the height difference is 0.1~0.3m, it can effectively decelerate the lubricating oil at a flow rate of 1.2~1.6m / s.

[0056] From the left end to the right end of the box body 4, the projection length of the second horizontal partition plate 603 on the horizontal plane is respectively greater than or equal to the projection length of the connecting plate 602 and the first horizontal partition plate 601 on the horizontal plane.

[0057] Since the horizontal partition 603 is the oil inlet of the buffer chamber 9 and the flow rate is relatively high, the horizontal partition 603 is set longer to ensure that there is enough buffer oil at the horizontal partition 603 to ensure the deceleration effect.

[0058] Furthermore, the oil inlet 5 is close to the right side wall of the box body 4 , and the oil outlet 8 is close to the left side wall of the box body 4 .

[0059] The above structure shows that the oil inlet 5 and the oil outlet 8 are far apart. When the lubricating oil flows upward, it can avoid direct impact on the filter device 3. At the same time, the oil inlet 5 and the oil outlet 8 are far apart, which can make the lubricating oil flow in the buffer chamber 9 with a larger space for a period of time before flowing out, ensuring the slowing down of the flow rate, allowing the impurities in the oil to be fully precipitated, and the bubbles in the oil to be fully released to the buffer oil surface.

[0060] Furthermore, the distance from the liquid surface of the buffer oil to the horizontal partition 601 is greater than or equal to 0.3m. This ensures that the buffer oil has sufficient depth to decelerate the lubricating oil at a flow rate of 1.2-1.6m / s; the gap between the liquid surface of the buffer oil and the top surface of the box 4 is 0.1-0.2m. This ensures that the bubbles can break into the air. The two sets of parameter conditions work together to ensure the deceleration and defoaming effects.

[0061] Furthermore, an air pressure regulating hole is opened on the top of the box body 4, and the air pressure regulating hole is communicated with the buffer chamber 9, and an air pump is arranged at the air pressure regulating hole.

[0062] In order to make the bubbles burst more easily, the pressure outside the bubbles can be made lower than the pressure inside the bubbles. Therefore, due to the presence of the vacuum pump, the vacuum pump can extract the air in the gap formed by the buffer oil liquid surface and the top surface of the box body 4, thereby reducing the pressure in the gap so that the bubbles can burst more easily after reaching the liquid surface.

[0063] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil tank for a steam turbine lubricating oil system, characterized in that: It comprises a box body (4), wherein a partition plate (6) is arranged inside the box body (4), wherein the partition plate (6) divides the interior of the box body (4) into a buffer chamber (9) and an oil storage chamber (10), wherein the buffer chamber (9) is located above the partition plate (6), and the oil storage chamber (10) is located below the partition plate (6); The partition plate (6) is provided with an oil inlet (5) and an oil outlet (8) which are connected to each other; An oil return pipe (7) is provided in the oil storage chamber (10), and a through oil return port is provided on the side wall of the box body (4); the outlet of the oil return pipe (7) is connected to the oil inlet (5), and the inlet of the oil return pipe (7) is connected to the oil return port; the oil return port is located below the partition plate (6); The oil outlet (8) is provided with a filter device (3); the buffer chamber (9) is connected to the oil storage chamber (10) through the filter device (3); The buffer chamber (9) stores buffer oil, and there is a gap between the liquid surface of the buffer oil and the top surface of the box body (4); The box (4) is a cube or a cuboid; The partition (6) comprises a horizontal partition 1 (601), a connecting plate (602) and a horizontal partition 2 (603); from the left end to the right end of the box body (4), the horizontal partition 1 (601), the connecting plate (602) and the horizontal partition 2 (603) are connected in sequence; The left end of the horizontal partition plate 1 (601) is connected to the left side wall of the box body (4), the front end of the horizontal partition plate 1 (601) is connected to the front side wall of the box body (4), and the rear end of the horizontal partition plate 1 (601) is connected to the rear side wall of the box body (4); The right end of the second horizontal partition (603) is connected to the right side wall of the box body (4), the front end of the second horizontal partition (603) is connected to the front side wall of the box body (4), and the rear end of the second horizontal partition (603) is connected to the rear side wall of the box body (4); The horizontal partition plate 1 (601) is located above the horizontal partition plate 2 (603); the oil inlet (5) is provided on the horizontal partition plate 2 (603), and the oil outlet (8) is provided on the horizontal partition plate 1 (601); The connecting plate (602) is arranged tilted so that the angle formed by the upper surface of the connecting plate (602) and the upper surface of the second horizontal partition (603) is greater than 90°; the left end of the connecting plate (602) is connected to the right end of the first horizontal partition (601); the right end of the connecting plate (602) is connected to the left end of the second horizontal partition (603); the front end of the connecting plate (602) is connected to the front side wall of the box body (4); and the rear end of the connecting plate (602) is connected to the rear side wall of the box body (4); The oil inlet (5) is close to the right side wall of the box body (4), and the oil outlet (8) is close to the left side wall of the box body (4).

2. The oil tank for a steam turbine lubricating oil system according to claim 1, characterized in that: The oil return port is close to the bottom of the oil storage chamber (10).

3. The oil tank for a steam turbine lubricating oil system according to claim 1, characterized in that: From the left end to the right end of the box body (4), the projection length of the second horizontal partition plate (603) on the horizontal plane is respectively greater than or equal to the projection length of the connecting plate (602) and the first horizontal partition plate (601) on the horizontal plane.

4. The oil tank for a steam turbine lubricating oil system according to claim 1, characterized in that: The angle formed by the upper surface of the connecting plate (602) and the upper surface of the second horizontal partition plate (603) is 150° to 170°.

5. The oil tank for a steam turbine lubricating oil system according to claim 1, characterized in that: The height difference between the upper surface of the horizontal partition 1 (601) and the upper surface of the horizontal partition 2 (603) is greater than or equal to 0.1m.

6. The oil tank for a steam turbine lubricating oil system according to claim 1, characterized in that: The distance from the liquid surface of the buffer oil to the horizontal partition (601) is greater than or equal to 0.3m.

7. The oil tank for a steam turbine lubricating oil system according to claim 1, characterized in that: The gap between the liquid surface of the buffer oil and the top surface of the box body (4) is greater than or equal to 0.1m.

8. The oil tank for a steam turbine lubricating oil system according to claim 1, characterized in that: An air pressure regulating hole is provided on the top of the box body (4), the air pressure regulating hole is in communication with the buffer chamber (9), and an air pump is provided at the air pressure regulating hole.

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