Compressor for balancing pore channel and mechanically sealing projecting shaft

Abstract

The utility model provides a mechanical seal compressor for balancing a pore passage on an extension shaft, which comprises a main machine shell and a rotor, a front end cover is arranged on the exhaust side of the main machine shell, a sealing end cover is arranged on the front end cover, and a bearing, a labyrinth seal and a mechanical seal are sequentially arranged on the extension shaft on the exhaust side of the rotor. The mechanical seal is located in the sealing end cover, a balance hole channel is formed in the sealing end cover, one end of the balance hole channel is communicated with the inlet end of the mechanical seal, and the other end of the balance hole channel is communicated with the air suction end of the main machine shell. According to the utility model, lubricating oil in the shell can be sealed by the mechanical seal, so that the lubricating oil is prevented from leaking out from the sealing end cover; the impact force of high-pressure gas in the shell on the mechanical seal can be reduced, the reliability of the mechanical seal is improved, and the service life of the mechanical seal is prolonged; and the air pressure difference in the shell can be balanced, and deformation of the shell due to too large internal pressure difference is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of compressor, more exactly relates to a compressor with balance hole and mechanical seal on the protruding shaft. BACKGROUND

[0002] When the oil injection screw compressor works, the gas sucked into the casing is in high temperature and high pressure state after compression, the sealing end cover arranged on the front end cover of the casing at the exhaust end of the compressor expands under heat and oil leakage may occur, the mechanical seal of the rotor out shaft end is also easily damaged and failed under the impact of high temperature and high pressure gas, and the pressure difference between the suction end and the exhaust end in the casing is large, which may cause the deformation of the casing. SUMMARY

[0003] The utility model wants to solve the technical problem, provide a kind of compressor with balance hole and mechanical seal on the protruding shaft, both can seal the lubricating oil in casing, prevent lubricating oil from leaking out from sealing end cover;It can also reduce the impact force of high pressure gas in casing on mechanical seal, improve the reliability of mechanical seal, prolong the service life of mechanical seal;It can also balance the pressure difference in casing, avoid the deformation of casing due to excessive internal pressure difference.

[0004] The technical solution of the utility model is to provide a kind of compressor with balance hole and mechanical seal on the protruding shaft, including main casing and rotor, the main casing is provided with front end cover at exhaust side, the front end cover is provided with sealing end cover, the rotor is provided with bearing, labyrinth seal and mechanical seal in turn on the protruding shaft at exhaust side, the mechanical seal is located in sealing end cover, the sealing end cover is provided with balance hole, one end of balance hole is communicated with the inlet end of mechanical seal, the other end of balance hole is communicated with the suction end of main casing.

[0005] Compared with prior art, the compressor with balance hole and mechanical seal on the protruding shaft of the utility model has the following advantages:

[0006] During the compressor working process, high-temperature and high-pressure gas in the main shell flows out through the gap between the bearing and the extended shaft of the rotor at the exhaust side, and when flowing through the labyrinth seal, the high-temperature and high-pressure gas passes through the extremely small gap between the labyrinth seal and the extended shaft of the rotor, so that the first throttling is achieved, the gas pressure is greatly reduced, the impact force directly on the mechanical seal is greatly reduced, the mechanical seal is prevented from being damaged, the reliability of the mechanical seal is improved, and the service life of the mechanical seal is prolonged; most of the high-temperature and high-pressure gas throttled through the labyrinth seal is guided to the gas suction end of the main shell through the balance hole to be compressed again, so that the gas pressure difference in the shell is balanced, and the shell is prevented from being deformed due to the excessively large internal pressure difference; after the gas pressure difference in the shell is balanced, the gas pressure at the inlet end of the mechanical seal is greatly reduced, the impact on the mechanical seal is also reduced, and only a small amount of gas enters the inlet end of the mechanical seal and finally passes through the mechanical seal, the lubricating oil leaked along with the gas flow is also very small, the mechanical seal can basically seal the lubricating oil in the shell, and the lubricating oil is prevented from leaking out of the seal end cover; finally, the high-temperature and high-pressure gas passing through the mechanical seal and impacting the seal end cover is also very small, the heat transfer of the high-temperature gas to the seal end cover is also extremely small, and the seal end cover is prevented from being deformed due to serious thermal expansion and oil leakage.

[0007] Preferably, the balance hole is arranged in the radial direction of the seal end cover, and one end of the balance hole is opposite to the positions between the inlet end of the mechanical seal and the outlet end of the labyrinth seal. With this structure, the balance hole can quickly guide the high-pressure gas impacting the mechanical seal after being throttled through the labyrinth seal.

[0008] Preferably, the seal end cover is provided with an oil drain hole, and the oil drain hole is in communication with the outlet end of the mechanical seal. With this structure, the small amount of lubricating oil leaked from the mechanical seal can accumulate in the oil drain hole of the seal end cover, so that the oil drain hole can be connected to an oil collecting box, and the lubricating oil accumulated in the oil drain hole can be collected. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a structure diagram of the extended shaft end of the rotor of the compressor of the utility model.

[0010] As shown in the figure: 1, balance hole, 2, seal end cover, 3, oil drain hole, 4, rotor, 5, mechanical seal, 6, bearing, 7, front end cover, 8, labyrinth seal. DETAILED DESCRIPTION

[0011] In order to better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0012] In the drawings, the thicknesses, dimensions and shapes of objects have been exaggerated slightly for ease of explanation. The drawings are merely examples and are not drawn to scale.

[0013] It should also be understood that the words "comprise", "have", "include", "contain", when used in this specification, indicate the presence of the stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0014] The compressor of the utility model, including host casing and rotor 4, as Figure 1 Indicated in the middle, host casing is provided with front end cover 7 on exhaust side, front end cover 7 is provided with sealing end cover 2, rotor 4 is provided with bearing 6, labyrinth seal 8 and mechanical seal 5 in turn on the shaft that stretches out on exhaust side, and mechanical seal 5 is located in sealing end cover 2, sealing end cover 2 is provided with balance hole 1, balance hole 1 is provided along the radial direction of sealing end cover 2, one end of balance hole 1 is opposite and communicates with the position between the inlet end of mechanical seal 5 and the outlet end of labyrinth seal 8, and the other end of balance hole 1 communicates with the suction end of host casing.Sealing end cover 2 is also provided with oil drain 3, and oil drain 3 communicates with the outlet end of mechanical seal 5.

[0015] In the embodiment, the specific structure of mechanical seal 5 and labyrinth seal 8 is not the invention point of the utility model, and all can adopt prior art, and sealing end cover 2 provided with balance hole 1, labyrinth seal 8 and mechanical seal 5 are combined and installed on the shaft that stretches out on exhaust side of compressor only to be the innovation point of the utility model.

[0016] The compressor of the utility model in working, high temperature and high pressure gas in main casing flows out through the gap between bearing and the projecting shaft of rotor 4 on the exhaust side, when flowing through labyrinth seal 8, through the tiny gap between labyrinth seal 8 and the projecting shaft of rotor 4, reach the first throttling, greatly reduce the gas pressure, when flowing to mechanical seal 5, can greatly reduce the impact force directly to mechanical seal 5, avoid mechanical seal 5 damage, improve the reliability of mechanical seal, prolong the service life of mechanical seal;High temperature and high pressure gas after throttling of labyrinth seal 8 mostly be introduced to the suction end of main casing through balance hole 1 and carry out secondary compression, balance the air pressure difference in casing, avoid the casing to deform because of the internal pressure difference too big;Very little high temperature and high pressure gas will enter the inlet end of mechanical seal 5 and finally pass through mechanical seal 5, the lubricating oil leaked with high temperature and high pressure gas stream is also very little, mechanical seal 5 basically can seal the lubricating oil in casing, prevent the lubricating oil from leaking out from the seal end cap;The high temperature and high pressure gas that finally pass through mechanical seal 5 and impact seal end cap 2 is also very little, the heat transfer of high temperature gas to seal end cap is also very little, can avoid the seal end cap to occur the deformation oil leakage situation of serious heat expansion.

[0017] If still have trace lubricating oil from mechanical seal 5 leak out, the trace lubricating oil leaked from mechanical seal 5 can also accumulate in the oil leak port of seal end cap 2, in this way, the oil leak port can be connected to the oil collecting box, and the lubricating oil accumulated in the oil leak port is collected.

[0018] The above is only the specific embodiment of the utility model, and is not used to limit the implementation range of the utility model;If the utility model is modified or replaced, without departing from the spirit and scope of the utility model, all should be covered in the protection scope of the utility model claim.

Claims

1. A balanced bore mechanical seal compressor for use on an overhung shaft comprising a main casing and a rotor (4), characterised in that, The main casing is provided with a front end cover (7) on the exhaust side, the front end cover (7) is provided with a sealing end cover (2), the rotor (4) is sequentially provided with a bearing (6), a labyrinth seal (8) and a mechanical seal (5) on the extended shaft on the exhaust side, the mechanical seal (5) is located in the sealing end cover (2), the sealing end cover (2) is provided with a balance channel (1), one end of the balance channel (1) is communicated with the inlet end of the mechanical seal (5), and the other end of the balance channel (1) is communicated with the suction end of the main casing.

2. A balanced bore for use in a canned compressor mechanically sealed on a projecting shaft according to claim 1, characterized in that, The balance channel (1) is arranged along the radial direction of the sealing end cover (2), and one end of the balance channel (1) is opposite to the position between the inlet end of the mechanical seal (5) and the outlet end of the labyrinth seal (8).

3. A balanced bore for use in a mechanical seal compressor on a throw shaft as defined in claim 1 wherein, The sealing end cover (2) is provided with an oil drain port (3), and the oil drain port (3) is communicated with the outlet end of the mechanical seal (5).

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