Expansion oil tank
By introducing an expansion oil tank into the reducer, using the bubble bursting mesh and floating tongue plate structure, the problem of lubricant oil splash caused by excessive oil temperature is solved, and the effective circulation of lubricant oil and equipment safety is achieved.
Patent Information
- Application Number
- CN202422603959.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-28
AI Technical Summary
Traditional reducers have excessive oil temperature rise, causing lubricating oil to spray out from the breather, resulting in insufficient lubrication and easy to cause equipment accidents.
An expansion oil tank is designed, including an upper support plate and a bubble breaker mesh plate, divided into an upper and lower compartment cavity, a floating tongue plate and a breather, which reduces the oil temperature through the bubble breaker mesh plate and controls the gas discharge to avoid lubricating oil splashing.
Effectively reduce the lubricant temperature, prevent splashing, ensure the circulation of lubricant, extend the service life of the reducer, and avoid equipment accidents.
Smart Images
Figure CN223152734U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of speed reducers, in particular to an expansion oil tank. Background Art
[0002] Due to the large volume of traditional speed reducers and the compact layout of the speed reduction mechanism in the box body, when the reduction ratio is too large, even if the lubricating oil is filled to the position of 1 / 2 - 2 / 3 of the oil window, the lubricating oil will spray out from the breather of the speed reducer due to the too high temperature rise of the oil temperature during the operation of the speed reducer, and the lubricating oil in the speed reducer box body gradually becomes insufficient, which is likely to cause insufficient lubrication and accidents of the equipment. Content of the Utility Model
[0003] The purpose of the utility model is to provide an expansion oil tank to alleviate the technical problems that the oil temperature in the speed reducer rises too high, the lubricating oil sprays out from the breather of the speed reducer, resulting in insufficient lubricating oil, which is likely to cause insufficient lubrication and accidents of the equipment.
[0004] The utility model provides an expansion oil tank, which includes an expansion oil tank body. An upper support plate and a bubble-breaking net plate are arranged in the expansion oil tank body. The upper support plate divides the inside of the expansion oil tank body into an upper cavity and a lower cavity, and the bubble-breaking net plate is arranged in the lower cavity;
[0005] At least one breather hole is arranged on the upper support plate, a floating tongue plate is arranged in the breather hole, and a breather is arranged at the upper end of the expansion oil tank body and is communicated with the upper cavity;
[0006] An oil inlet pipe and an oil return pipe are arranged on the expansion oil tank body, and the oil inlet pipe is communicated with the lower cavity, and the oil return pipe is communicated with the upper cavity.
[0007] In an optional embodiment, the floating tongue plate includes a tongue plate body. One end of the tongue plate body is provided with a first baffle extending downward, and the other end is provided with a second baffle extending downward; an upper blocking piece is arranged at the upper end of the first baffle, and the upper blocking piece is located above the upper end face of the upper support plate; a first lower blocking piece is arranged at the lower end of the first baffle, and the first lower blocking piece is located below the lower end face of the upper support plate; the first lower blocking piece and the upper blocking piece cooperate to limit the moving range of the upper support plate;
[0008] A contact part is formed at the connection between the second baffle and the tongue plate body, and a second lower blocking piece is arranged at the lower end of the second baffle, and the second lower blocking piece is located below the lower end face of the upper support plate;
[0009] A limiting plate is arranged on the upper end face of the upper support plate, the limiting plate is arranged on one side of the breather hole, and the limiting plate extends above the breather hole;
[0010] The abutting portion cooperates with the limiting plate to limit the movement range of the tongue plate body.
[0011] In an alternative embodiment, a plurality of ventilation holes are provided on the upper support plate, and the plurality of ventilation holes are arranged in multiple rows and columns.
[0012] In an alternative embodiment, an oil inlet joint is provided at one end of the oil inlet pipe away from the expansion tank body, and an oil return joint is provided at one end of the oil return pipe away from the expansion tank body; both the oil inlet joint and the oil return joint are used to connect with a speed reducer.
[0013] In an alternative embodiment, an oil filling valve is provided at the upper end of the expansion tank body, an oil filling pipe is provided at the lower end of the oil filling valve, and the oil filling pipe sequentially passes through the upper support plate and the bubble-breaking mesh plate and extends into the lower cavity.
[0014] In an alternative embodiment, an oil filling funnel communicating with the oil filling valve is provided at the upper end of the oil filling valve.
[0015] In an alternative embodiment, an oil drain valve is provided on the expansion tank body, and the oil drain valve communicates with the lower cavity.
[0016] In an alternative embodiment, a sight glass is provided on the expansion tank body, the sight glass extends from the upper cavity to the lower cavity, and the conditions in both the upper cavity and the lower cavity can be observed simultaneously through the sight glass.
[0017] In an alternative embodiment, a viewing window is provided on the expansion tank body, and the viewing window is provided at the lower end of the sight glass.
[0018] In an alternative embodiment, a connecting plate is provided on the expansion tank body, and the connecting plate is used to connect with a speed reducer.
[0019] The expansion tank body provided by the present utility model is used for connection with a speed reducer. After the lubricating oil temperature in the speed reducer rises, it enters the lower cavity of the expansion tank body. After the lubricating oil temperature rises, oil bubbles are generated. The lubricating oil with oil bubbles passes through the bubble-breaking mesh plate. The bubble-breaking mesh plate can break a large number of oil bubbles and increase the heat dissipation area, reducing the temperature of the lubricating oil. When the temperature rise of the lubricating oil is too high, the lubricating oil will push open the floating tongue plate, enabling the expanded gas to enter the upper cavity. After the pressure in the upper cavity increases, the gas is discharged from the breather of the expansion tank. This can avoid the problem that the lubricating oil splashes after the lubricating oil temperature rises, resulting in insufficient lubricating oil in the speed reducer, and ensure the service life of the speed reducer. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1 Structural schematic diagram of the connection between the expansion oil tank and the speed reducer provided by the embodiment of the present invention;
[0022] Figure 2 For Figure 1 Partial enlarged view of A of the structural schematic diagram of the connection between the expansion oil tank and the speed reducer shown;
[0023] Figure 3 For Figure 1 Partial enlarged view of B of the structural schematic diagram of the connection between the expansion oil tank and the speed reducer shown;
[0024] Figure 4 For Figure 1 Structural schematic diagram of the upper support plate of the structural schematic diagram of the connection between the expansion oil tank and the speed reducer shown;
[0025] Figure 5 Structural schematic diagram of the expansion oil tank provided by the embodiment of the present invention.
[0026] Icon: 100 - bubble-breaking mesh plate; 200 - expansion oil tank main body; 300 - upper support plate; 400 - floating tongue plate; 401 - upper blocking member; 402 - first baffle; 403 - first lower blocking member; 404 - tongue plate main body; 405 - second baffle; 406 - second lower blocking member; 500 - limiting plate; 600 - breather hole; 700 - drain valve; 800 - fuel filling pipe; 900 - fuel filling valve; 110 - fuel filling funnel; 120 - connecting plate; 130 - return oil pipe; 140 - inlet oil pipe; 150 - speed reducer; 160 - breather; 170 - sight glass; 180 - viewing window; 190 - upper cavity; 210 - lower cavity. Specific embodiments
[0027] Terms such as "first", "second", "third", etc. are only used for distinguishing descriptions, do not represent the arrangement serial number, and cannot be understood as indicating or implying relative importance.
[0028] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0029] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "left", "right", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0030] In the description of the present application, unless otherwise clearly defined and limited, the terms "set", "install", "connect", and "couple" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements.
[0031] The technical solutions of the present application will be clearly and completely described below with reference to the drawings.
[0032] Embodiment
[0033] Referring to Figures 1 - 5 , the present utility model provides an expansion oil tank, which includes an expansion oil tank main body 200. An upper support plate 300 and a foam-breaking net plate 100 are arranged in the expansion oil tank main body 200. The upper support plate 300 divides the inside of the expansion oil tank main body 200 into an upper cavity 190 and a lower cavity 210, and the foam-breaking net plate 100 is arranged in the lower cavity 210;
[0034] At least one vent hole 600 is arranged on the upper support plate 300, a floating tongue plate 400 is arranged in the vent hole 600, and a breather 160 communicating with the upper cavity 190 is arranged at the upper end of the expansion oil tank main body 200;
[0035] An oil inlet pipe 140 and an oil return pipe 130 are arranged on the expansion oil tank main body 200, and the oil inlet pipe 140 communicates with the lower cavity 210, and the oil return pipe 130 communicates with the upper cavity 190.
[0036] In some embodiments, this expansion oil tank is used to connect with a speed reducer 150. The lubricating oil in the speed reducer 150 enters the expansion oil tank main body 200 through the oil inlet pipe 140, and the lubricating oil in the expansion oil tank enters the speed reducer 150 through the oil return pipe 130.
[0037] The upper support plate 300 arranged in the expansion oil tank main body 200 divides the expansion oil tank main body 200 into an upper cavity 190 and a lower cavity 210. The lubricating oil in the lower cavity 210 needs to pass through the foam-breaking net plate 100 to enter the upper cavity 190.
[0038] High-temperature lubricating oil will generate oil bubbles. When the lubricating oil in the speed reducer 150 enters the lower cavity 210, the lubricating oil generally carries a large number of oil bubbles; the oil bubbles move towards the bubble-breaking mesh plate 100, and the bubble-breaking mesh plate 100 causes most of the oil bubbles to burst, and the lubricating oil flowing onto the bubble-breaking mesh plate 100 only has a small amount of oil bubbles; as the temperature of the lubricating oil rises, the lubricating oil continues to flow upward, and the lubricating oil pushes open the floating tongue plate 400, and the expanded gas enters the upper cavity 190; as the pressure in the upper cavity 190 increases, the gas can be discharged through the breather 160 of the expansion oil tank; in this way, pressure relief is achieved, and during the pressure relief process, no lubricating oil is discharged, avoiding the site dirt caused by oil leakage, and may cause a fire or explosion in a flammable and explosive environment.
[0039] Refer to Figure 2 and Figure 3 In an alternative embodiment, the floating tongue plate 400 includes a tongue plate main body 404, one end of the tongue plate main body 404 is provided with a first baffle 402 extending downward, and the other end is provided with a second baffle 405 extending downward; an upper blocking member 401 is provided at the upper end of the first baffle 402, and the upper blocking member 401 is located above the upper end surface of the upper support plate 300; a first lower blocking member 403 is provided at the lower end of the first baffle 402, and the first lower blocking member 403 is located below the lower end surface of the upper support plate 300; the first lower blocking member 403 and the upper blocking member 401 cooperate to limit the movement range of the upper support plate 300;
[0040] A contact portion is formed at the connection between the second baffle 405 and the tongue plate main body 404, and a second lower blocking member 406 is provided at the lower end of the second baffle 405, and the second lower blocking member 406 is located below the lower end surface of the upper support plate 300;
[0041] A limiting plate 500 is provided on the upper end surface of the upper support plate 300, the limiting plate 500 is provided on one side of the vent hole 600, and the limiting plate 500 extends above the vent hole 600;
[0042] The contact portion and the limiting plate 500 cooperate to limit the movement range of the tongue plate main body 404.
[0043] In some embodiments, the first baffle 402 and the second baffle 405 of the tongue plate body 404 of the floating tongue plate 400 are arranged at both ends of the tongue plate body 404. The upper blocking member 401 of the first baffle 402 is located at the upper end of the upper support plate 300, and the first lower blocking member 403 is located at the lower end of the upper support plate 300. When gas or lubricating oil presses the tongue plate body 404, the first lower blocking member 403 abuts against the upper support plate 300, thus preventing the tongue plate body 404 from moving upward continuously. At this time, a channel is formed on the side of the tongue plate body 404, and the gas below the upper support plate 300 can flow through the channel to the upper side of the upper support plate 300, that is, the expanding gas in the lower cavity 210 enters the upper cavity 190. When the pressure in the upper cavity 190 reaches a certain level, the gas is discharged from the breather 160 of the expansion oil tank.
[0044] A second lower blocking member 406 is arranged on the second baffle 405. The length of the second lower blocking member 406 is relatively large. The second lower blocking member 406 is located below the upper support plate 300. When the lubricating oil causes the floating tongue plate 400 to float, only one end of the floating tongue plate 400 can float. When the floating tongue plate 400 floats to a certain extent, the abutting portion abuts against the limiting plate 500, restricting the floating tongue plate 400 from rotating further.
[0045] Refer to Figure 2 , when there is less lubricating oil in the expansion oil tank body 200, the floating tongue plate 400 is not affected by the buoyancy of the lubricating oil. The floating tongue plate 400 moves downward under the action of gravity, and the upper blocking member 401 on the floating tongue plate 400 abuts against the upper support plate 300. The tongue plate body 404 can cover the vent hole 600, that is, the tongue plate body 404 does not enter the vent hole 600.
[0046] Refer to Figure 4 , in an alternative embodiment, a plurality of vent holes 600 are provided on the upper support plate 300, and the plurality of vent holes 600 are arranged in multiple rows and multiple columns.
[0047] In some embodiments, four vent holes 600 are provided on the upper support plate 300, and the four vent holes 600 are arranged in two rows and two columns. The vent holes 600 provided on the upper support row can also be arranged in two rows and multiple columns.
[0048] In an alternative embodiment, an oil inlet joint is provided at one end of the oil inlet pipe 140 away from the expansion oil tank body 200, and an oil return joint is provided at one end of the oil return pipe 130 away from the expansion oil tank body 200. Both the oil inlet joint and the oil return joint are used to connect with the speed reducer 150, and the connection point of the oil return pipe 130 and the upper cavity 190 is located above the upper support plate 300.
[0049] To facilitate the connection of the oil inlet pipe 140 and the oil return pipe 130 to the speed reducer 150, an oil inlet joint is provided on the oil inlet pipe 140, and an oil return joint is provided on the oil return pipe 130; after the lubricating oil in the speed reducer 150 heats up and expands, it enters the lower cavity 210 from the oil inlet pipe 140, defoams in the expansion oil tank main body 200, and then enters the upper cavity 190; the expansion oil tank main body 200 also has a certain heat dissipation effect on the lubricating oil. The lubricating oil entering the upper cavity 190 defoams and then enters the speed reducer 150 from the oil return pipe 130 again, which can ensure that there is enough lubricating oil in the speed reducer 150; and it can prevent the lubricating oil containing a large amount of oil bubbles from entering the speed reducer 150.
[0050] When the mixing equipment starts, the lubricating oil in the speed reducer 150 splashes into the expansion oil tank due to temperature rise and is collected. The excess oil flows back to the speed reducer 150 housing through the oil return pipe 130 at the upper part of the expansion oil tank, and there will be no oil dirt at the site.
[0051] Refer to Figure 1 In an alternative embodiment, a filling valve 900 is provided at the upper end of the expansion oil tank main body 200. A filling pipe 800 is provided at the lower end of the filling valve 900. The filling pipe 800 sequentially passes through the upper support plate 300 and the bubble-breaking mesh plate 100 and extends into the lower cavity 210.
[0052] In an alternative embodiment, a filling funnel 110 communicating with the filling valve 900 is provided at the upper end of the filling valve 900.
[0053] To facilitate adding lubricating oil to the speed reducer 150, a filling valve 900 is provided on the expansion oil tank main body 200, and a filling pipe 800 is provided on the filling valve 900. The filling pipe 800 sequentially passes through the upper support plate 300 and the bubble-breaking mesh plate 100 and then extends into the lower cavity 210; to enable the lubricating oil to flow better into the filling valve 900, a funnel is provided on the filling valve 900; when lubricating oil needs to be added, the lubricating oil is poured into the funnel, and the lubricating oil flows along the filling valve 900 into the filling pipe 800 and enters the lower cavity 210 along the filling pipe 800, realizing the replenishment of the lubricating oil in the expansion oil tank main body 200; when lubricating oil does not need to be added, the filling valve 900 is in a closed state.
[0054] In an alternative embodiment, an oil drain valve 700 is provided on the expansion oil tank main body 200, and the oil drain valve 700 communicates with the lower cavity 210.
[0055] The connection of the oil drain valve 700 to the expansion oil tank main body 200 is located at the lower end of the lower cavity 210, so that the lubricating oil in the lower cavity 210 can smoothly drain from the oil drain valve 700. When the lubricating oil is replaced, the excess lubricating oil is discharged into a recovery bucket.
[0056] Referring to Figure 5 , in an alternative embodiment, a sight glass 170 is provided on the expansion oil tank body 200. The sight glass 170 extends from the upper cavity 190 to the lower cavity 210, and the conditions inside the upper cavity 190 and the lower cavity 210 can be observed simultaneously through the sight glass 170.
[0057] In an alternative embodiment, a viewing window 180 is provided on the expansion oil tank body 200. The viewing window 180 is provided at the lower end of the sight glass 170.
[0058] In some embodiments, a sight glass 170 and a viewing window 180 are provided on the expansion oil tank body 200. The sight glass 170 is provided above the viewing window 180; the conditions inside the upper cavity 190 and the lower cavity 210 can be seen simultaneously through the sight glass 170. That is, after the lubricating oil is heated up, the oil levels in the upper cavity 190 and the lower cavity 210 change. At any time, the liquid level change during the temperature rise of the speed reducer 150 can be observed, whether oil bubbles are generated, etc., and the thermal overload condition of the speed reducer 150 can be further understood, so as to determine whether to select a fully synthetic lubricating oil with a higher viscosity.
[0059] The height of the viewing window 180 is relatively low. When lubricating oil is added to the lower cavity 210 through the oil filling valve 900, the oil level of the lubricating oil in the lower cavity 210 is observed through inspection. Generally, the lubricating oil is filled to the position of 1 / 2 - 2 / 3 of the viewing window 180.
[0060] In an alternative embodiment, a connecting plate 120 is provided on the expansion oil tank body 200. The connecting plate 120 is used to connect with the speed reducer 150.
[0061] In order to firmly connect the expansion oil tank body 200 with the speed reducer 150, a connecting plate 120 is provided on the expansion oil tank body 200, and the expansion oil tank body 200 is connected with the speed reducer 150 through the connecting plate 120.
[0062] The expansion oil tank body 200 provided by the present invention is used for connecting with the speed reducer 150. After the temperature of the lubricating oil in the speed reducer 150 rises too high, it enters the lower cavity 210 of the expansion oil tank body 200. After the lubricating oil temperature rises, oil bubbles are generated. After the lubricating oil with oil bubbles passes through the bubble-breaking mesh plate 100, the bubble-breaking mesh plate 100 can break a large number of oil bubbles and can increase the heat dissipation area, reducing the temperature of the lubricating oil. When the temperature of the lubricating oil continues to rise, the lubricating oil will push open the floating tongue plate 400, enabling the expanded gas to enter the upper cavity 190. In this way, it can avoid the problem that the lubricating oil splashes after the temperature of the lubricating oil rises, resulting in insufficient lubricating oil in the speed reducer 150, and ensure the service life of the speed reducer 150.
[0063] The speed reducer 150 is provided with an external expansion oil tank. When the speed reducer 150 of the mixing equipment is running, the lubricating oil temperature rises and expands, overflows into the expansion oil tank, and the excessive lubricating oil flows back into the speed reducer 150 housing through the oil return pipe 130. The expansion oil tank assists in completing the internal circulation of the lubricating oil, and the oil does not leak out. The temperature in the expansion oil tank is slightly higher than the room temperature and lower than the oil temperature of the speed reducer 150. The lubricating oil is effectively cooled in the expansion oil tank, and when it flows back into the speed reducer 150 housing again, it can inhibit the temperature rise of the speed reducer 150 and further extend its service life.
[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. An expansion fuel tank, characterized in that, It includes an expansion oil tank body (200), in which an upper support plate (300) and a foam-breaking mesh plate (100) are arranged. The upper support plate (300) divides the inside of the expansion oil tank body (200) to form an upper cavity (190) and a lower cavity (210), and the foam-breaking mesh plate (100) is arranged in the lower cavity (210). At least one air vent hole (600) is arranged on the upper support plate (300), a floating tongue plate (400) is arranged in the air vent hole (600), and a breather (160) communicating with the upper cavity (190) is arranged at the upper end of the expansion oil tank body (200). An oil inlet pipe (140) and an oil return pipe (130) are arranged on the expansion oil tank body (200), and the oil inlet pipe (140) communicates with the lower cavity (210), and the oil return pipe (130) communicates with the upper cavity (190).
2. The expansion tank according to claim 1, wherein, The floating tongue plate (400) includes a tongue plate body (404). One end of the tongue plate body (404) is provided with a first baffle (402) extending downward, and the other end is provided with a second baffle (405) extending downward; an upper blocking member (401) is arranged at the upper end of the first baffle (402), and the upper blocking member (401) is located above the upper end surface of the upper support plate (300); a first lower blocking member (403) is arranged at the lower end of the first baffle (402), and the first lower blocking member (403) is located below the lower end surface of the upper support plate (300); the first lower blocking member (403) and the upper blocking member (401) cooperate to limit the moving range of the upper support plate (300). A butt joint part is formed at the connection part of the second baffle (405) and the tongue plate body (404), and a second lower blocking member (406) is arranged at the lower end of the second baffle (405), and the second lower blocking member (406) is located below the lower end surface of the upper support plate (300). A limiting plate (500) is arranged on the upper end surface of the upper support plate (300), the limiting plate (500) is arranged on one side of the air vent hole (600), and the limiting plate (500) extends above the air vent hole (600). The butt joint part and the limiting plate (500) cooperate to limit the moving range of the tongue plate body (404).
3. The expansion tank according to claim 1, wherein, A plurality of air vent holes (600) are arranged on the upper support plate (300), and the plurality of air vent holes (600) are arranged in multiple rows and multiple columns.
4. The expansion tank according to claim 1, characterized in that, An oil inlet joint is arranged at the end of the oil inlet pipe (140) far away from the expansion oil tank body (200), and an oil return joint is arranged at the end of the oil return pipe (130) far away from the expansion oil tank body (200); both the oil inlet joint and the oil return joint are used for connecting with a speed reducer (150).
5. The expansion tank according to claim 1, wherein An oil filling valve (900) is provided at the upper end of the expansion oil tank body (200). An oil filling pipe (800) is provided at the lower end of the oil filling valve (900). The oil filling pipe (800) sequentially passes through the upper support plate (300) and the bubble-breaking mesh plate (100) and extends into the lower cavity (210).
6. The expansion tank according to claim 5, characterized in that, An oil filling funnel (110) communicating with the oil filling valve (900) is provided at the upper end of the oil filling valve (900).
7. The expansion tank according to claim 1, characterized in that, An oil drain valve (700) is provided on the expansion oil tank body (200). The oil drain valve (700) communicates with the lower cavity (210).
8. The expansion tank according to claim 1, wherein A sight glass (170) is provided on the expansion oil tank body (200). The sight glass (170) extends from the upper cavity (190) to the lower cavity (210), and the conditions inside the upper cavity (190) and the lower cavity (210) can be observed simultaneously through the sight glass (170).
9. The expansion tank according to claim 8, characterized in that, A viewing window (180) is provided on the expansion oil tank body (200). The viewing window (180) is provided at the lower end of the sight glass (170).
10. The expansion fuel tank according to claim 1, characterized in that, A connecting plate (120) is provided on the expansion oil tank body (200). The connecting plate (120) is used to connect with a speed reducer (150).