Mechanical seal cooling structure and application

Abstract

The invention provides a mechanical seal cooling structure and application, and belongs to the field of waste gas treatment of petrochemical devices. The mechanical seal cooling structure comprises an oil cup, an ascending oil pipe and a descending oil pipe. The oil cup is arranged above the mechanical seal; the upper end of the ascending oil pipe penetrates through the bottom of the oil cup and then is located in an inner cavity of the oil cup, and the lower end is communicated with a sealing oil outlet of the mechanical seal. The upper end of the descending oil pipe is communicated with the bottom of the oil cup, and the lower end is communicated with a sealing oil inlet of the mechanical seal. Friction heat in the mechanical seal can be effectively taken away, meanwhile, the mechanical seal is in a good lubricating state, and the service life of the mechanical seal is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of waste gas treatment of petrochemical devices, and specifically relates to a mechanical seal cooling structure and application thereof, which is used for mechanical seal cooling of a Roots blower. Background Art

[0002] Roots blower is a gas conveying power machine commonly used in tail gas collection and incineration applications due to its simple structure, durability, reliable use, high efficiency, high boost and low cost. Roots blower has a compact structure and adopts a two-end support structure. The non-drive end is a gearbox and the motor side is the drive end. A mechanical seal is set on the shaft extension side of the blower main shaft at the drive end to prevent leakage of lubricating oil or the transported gas.

[0003] The mechanical seal includes a stationary ring and a dynamic ring arranged along the axial direction, and is provided with a sealing liquid outlet and a sealing liquid inlet, and the sealing liquid outlet and the sealing liquid inlet are connected to the sealing chamber. The stationary ring is fixed, and the dynamic ring is pressed by a spring. When the main shaft of the fan rotates, the dynamic ring rotates with the main shaft, so the end faces between the dynamic ring and the static ring will rub. Since the two end faces of the dynamic ring and the static ring are not completely closed, the sealing liquid (i.e., lubricating oil) will leak slightly between the end faces of the dynamic ring and the static ring, that is, leaking from between the dynamic ring and the static ring. Since the sealing liquid in the sealing chamber hardly flows, the friction heat caused by the friction of the contact end faces of the dynamic ring and the static ring cannot be taken away in time, which in turn affects the service life of the mechanical seal and may even cause abnormal temperature rise of the mechanical seal. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a mechanical seal cooling structure and application, which can effectively remove the friction heat in the mechanical seal and keep the mechanical seal in a good lubrication state.

[0005] The present invention is achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a mechanical seal cooling structure, the mechanical seal cooling structure comprising: an oil cup, an upward oil pipe, and a downward oil pipe;

[0007] The oil cup is arranged above the mechanical seal;

[0008] The upper end of the upward oil pipe passes through the bottom of the oil cup and is located in the inner cavity of the oil cup, and the lower end is communicated with the sealing oil outlet of the mechanical seal;

[0009] The upper end of the descending oil pipe is communicated with the bottom of the oil cup, and the lower end is communicated with the sealing oil inlet of the mechanical seal.

[0010] Preferably, the oil cup is filled with lubricating oil.

[0011] Preferably, the upper end surface of the ascending oil pipe is located above the liquid level of the lubricating oil; and the upper end surface of the descending oil pipe is located below the liquid level of the lubricating oil.

[0012] Preferably, an oil cup cover is provided at the upper end of the oil cup.

[0013] Preferably, a refueling port and an exhaust port are provided on the oil cup cover.

[0014] Preferably, a visual liquid level gauge is provided on the side of the oil cup.

[0015] Preferably, the maximum liquid level and the minimum liquid level are marked on the side of the oil cup.

[0016] Preferably, the ascending oil pipe and the descending oil pipe are connected to the oil sealing outlet and the oil sealing inlet through threads.

[0017] Preferably, a support plate is connected to the side of the oil cup;

[0018] One end of the support plate is fixedly connected to the side of the oil cup, and the other end is fixedly connected to the outer shell of the Roots blower.

[0019] The second aspect of the present invention provides application of the above mechanical seal cooling structure in a Roots blower.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the present invention can effectively take away the friction heat in the mechanical seal, and at the same time put the mechanical seal in a good lubrication state, thereby extending the service life of the mechanical seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A front view of the mechanical seal cooling structure of the present invention;

[0022] Figure 2 A side view of the mechanical seal cooling structure of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0024] In order to cool the mechanical seal in the Roots blower and extend the service life of the mechanical seal, the present invention provides a mechanical seal cooling structure. The present invention is a self-circulating system using lubricating oil as sealing oil, serving the mechanical seal, and can effectively take away the friction heat of the sealing end face, while keeping the friction pair in a good lubrication state.

[0025] like Figure 1 and Figure 2As shown, the mechanical seal cooling structure includes: an oil cup 1, an upward oil pipe 2, and a downward oil pipe 3. The oil cup 1 is arranged above the mechanical seal. The upper end of the upward oil pipe 2 passes through the bottom of the oil cup 1 and is located in the inner cavity of the oil cup 1. The lower end of the upward oil pipe 2 is connected to the oil seal outlet of the mechanical seal 4 (the two can be connected by threads); the upper end of the downward oil pipe 3 is connected to the bottom of the oil cup 1, and the lower end is connected to the oil seal inlet of the mechanical seal 4 (the two can be connected by threads).

[0026] Embodiments of the present invention are as follows:

[0027] Embodiment 1:

[0028] The oil cup 1 is filled with lubricating oil, the upper end surface of the upward oil pipe 2 is located above the liquid level of the lubricating oil, and the upper end surface of the downward oil pipe 3 is located below the liquid level of the lubricating oil.

[0029] Embodiment 2:

[0030] An oil cup cover is provided at the upper end of the oil cup 1, and a refueling port 101 and an exhaust port 102 are provided on the oil cup cover. When lubricating oil needs to be poured into the oil cup 1, the refueling port 101 is opened, and the exhaust port 102 is opened at the same time, and lubricating oil is injected into the oil cup 1 through the refueling port 101, and gas is discharged from the exhaust port 102. When filling oil, ensure that the upper end surface of the upward oil pipe 2 is always above the liquid level.

[0031] Embodiment 3:

[0032] A visual level gauge 7 is provided on the side of the oil cup 1, and the highest and lowest levels are marked. The usage of the lubricating oil in the oil cup 1 can be understood through the reading of the visual level gauge 7. If the level of the lubricating oil in the oil cup 1 drops rapidly in a short period of time, it means that the mechanical seal 4 is damaged, the two end faces are worn and leaking, and the mechanical seal should be replaced as soon as possible; if the level of the lubricating oil in the oil cup 1 drops normally, when the level reaches the lowest level, it is necessary to open the refueling port 101 and the exhaust port 102, and add the lubricating oil to the oil cup 1 through the refueling port 101.

[0033] Embodiment 4:

[0034] A support plate 6 is connected to the side of the oil cup 1. One end of the support plate 6 is fixedly connected to the side of the oil cup 1, and the other end is fixedly connected to the housing of the Roots blower. Because the vibration of the Roots blower is below 4.5 mm / s under normal use, the oil cup 1 is better fixed by the support plate 6.

[0035] When the Roots blower is running, the lubricating oil (i.e., sealing oil) in the oil cup 1 enters the sealing chamber from the descending oil pipe 3. Since the dynamic and static ring end faces of the mechanical seal continuously generate friction heat, the temperature of the lubricating oil in the sealing chamber is higher than the temperature in the oil cup 1. The volume of the lubricating oil expands and the specific gravity decreases, causing relative displacement of the oil particles. The lubricating oil returns to the oil cup 1 through the ascending oil pipe 2, thereby achieving the purpose of convection and heat exchange.

[0036] The present invention takes away the friction heat on the end faces of the dynamic and static rings in the mechanical seal through a self-circulating structure, so that the friction pair is in a good operating state, thereby reducing the temperature of the mechanical seal and extending the life of the mechanical seal. The present invention only uses an oil cup to achieve the purpose of seal lubrication and cooling, which is very economical and practical.

[0037] The shaft extension side of the blower main shaft 5 of the Roots blower effectively prevents the leakage of lubricating oil through the mechanical seal 4. The present application provides cooling and lubrication for the mechanical seal, thereby increasing the service life of the mechanical seal and better ensuring that the conveying medium is leak-free.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0040] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A mechanical seal cooling structure, characterized in that: The mechanical seal cooling structure comprises: an oil cup, an upward oil pipe, and a downward oil pipe; The oil cup is arranged above the mechanical seal; The upper end of the upward oil pipe passes through the bottom of the oil cup and is located in the inner cavity of the oil cup, and the lower end is communicated with the sealing oil outlet of the mechanical seal; The upper end of the descending oil pipe is communicated with the bottom of the oil cup, and the lower end is communicated with the sealing oil inlet of the mechanical seal.

2. The mechanical seal cooling structure according to claim 1, characterized in that: The oil cup is filled with lubricating oil.

3. The mechanical seal cooling structure according to claim 2, characterized in that: The upper end surface of the ascending oil pipe is located above the liquid level of the lubricating oil; the upper end surface of the descending oil pipe is located below the liquid level of the lubricating oil.

4. The mechanical seal cooling structure according to claim 1, characterized in that: An oil cup cover is arranged on the upper end of the oil cup.

5. The mechanical seal cooling structure according to claim 4, characterized in that: The oil cup cover is provided with a fuel filling port and an exhaust port.

6. The mechanical seal cooling structure according to claim 1, characterized in that: A visual liquid level gauge is provided on the side of the oil cup.

7. The mechanical seal cooling structure according to claim 1, characterized in that: The maximum and minimum liquid levels are marked on the side of the oil cup.

8. The mechanical seal cooling structure according to claim 1, characterized in that: The upward oil pipe and the downward oil pipe are connected with the sealing oil outlet and the sealing oil inlet through threads.

9. The mechanical seal cooling structure according to claim 1, characterized in that: A support plate is connected to the side of the oil cup; One end of the support plate is fixedly connected to the side of the oil cup, and the other end is fixedly connected to the outer shell of the Roots blower.

10. Application of the mechanical seal cooling structure according to any one of claims 1 to 9 in a Roots blower.

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