CN216044410U

CN216044410U - Oil seal assembly of oil-free screw compressor and ventilation structure thereof

Info

Publication number: CN216044410U
Application number: CN202121516241.3U
Authority: CN
Inventors: 周坤; 马升; 庄博; 周武彬
Original assignee: Ningbo Baosi Energy Equipment Co Ltd
Current assignee: Ningbo Baosi Energy Equipment Co Ltd
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2022-03-15
Anticipated expiration: 2031-07-05

Abstract

The utility model provides an oil blanket subassembly of oil-free helical-lobe compressor which characterized in that: including axle stifled, filter core and apron, the one end of axle stifled is equipped with the screw thread portion that is used for linking to each other with the rotor, and the coaxial first recess that is used for installing the filter core that sets up of the other end, the coaxial first through-hole that is linked together with first recess that sets up in the screw thread portion, the filter core is installed in the first recess of axle stifled and the coaxial second through-hole that is linked together with first through-hole that sets up, the top at the filter core is closed to the airtight lid of apron, the region that the side of axle stifled is located the filter core and covers is equipped with a plurality of ventilation hole, the filter core is made and compresses tightly and seals all ventilation hole for hindering oily ventilative material. The oil seal assembly of the oil-free screw compressor can effectively balance the negative pressure of the rotor chamber during unloading, so that lubricating oil in the lubricating chamber is difficult to flow into the rotor chamber. In addition, the ventilation structure of the oil-free screw compressor comprising the oil seal assembly is also provided.

Description

Oil seal assembly of oil-free screw compressor and ventilation structure thereof

Technical Field

The utility model relates to the technical field of compressors, in particular to an oil seal assembly of an oil-free screw compressor and a ventilation structure of the oil seal assembly.

Background

In an oil-free screw compressor, air is compressed by a pair of male and female screw rotors that can rotate in a non-oil-feeding and non-contact manner. Although oil-free compression is performed in the rotor chamber of the oil-free screw compressor, components such as bearings disposed outside the rotor chamber and located at both ends of the male and female screw rotors still need to be lubricated. Therefore, it is necessary to provide reliable oil seal assemblies between the suction side lubrication chamber and the rotor chamber and between the discharge side lubrication chamber and the rotor chamber to prevent the lubricating oil on both sides of the rotor chamber from entering the rotor chamber.

However, during the unloading operation, the rotor chamber has strong air flow adsorption capacity due to the negative pressure of the rotor chamber, so that the air flow of the lubrication areas on the two sides can carry a small amount of lubricating oil to pass through the oil seal assembly to be adsorbed into the rotor chamber. Therefore, there is a need to design an oil seal assembly that can effectively balance the negative pressure of the rotor chamber during unloading, so that the lubricant in the lubricant chamber is not easy to flow into the rotor chamber.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the oil seal assembly of the oil-free screw compressor can effectively balance the negative pressure of the rotor chamber during unloading, so that lubricating oil in the lubricating chamber is difficult to flow into the rotor chamber.

The technical solution of the utility model is as follows: the utility model provides an oil blanket subassembly of oil-free helical-lobe compressor which characterized in that: including axle stifled, filter core and apron, the one end of axle stifled is equipped with the screw thread portion that is used for linking to each other with the rotor, and the coaxial first recess that is used for installing the filter core that sets up of the other end, the coaxial first through-hole that is linked together with first recess that sets up in the screw thread portion, the filter core is installed in the first recess of axle stifled and the coaxial second through-hole that is linked together with first through-hole that sets up, the top at the filter core is closed to the airtight lid of apron, the region that the side of axle stifled is located the filter core and covers is equipped with a plurality of ventilation hole, the filter core is made and compresses tightly and seals all ventilation hole for hindering oily ventilative material.

The working principle of the oil seal assembly of the oil-free screw compressor is as follows:

during the uninstallation, because the rotor chamber is the negative pressure, can adsorb the air current of carrying a small amount of lubricating oil in the lubrication chamber, the air current is before adsorbing the rotor chamber, because there are a plurality of ventilative through-holes and filter core for hindering oily ventilative material on the axle stifled, can make gas enter into the rotor through the ventilative through-hole and the filter core of axle stifled in, and lubricating oil can receive blockking of filter core and can't enter into the rotor in, the air current that adsorbs in the rotor through oil-gas separation passes through corresponding air flow channel again, can be outside the eduction gear.

After adopting the structure, the utility model has the following advantages:

according to the oil seal assembly of the oil-free screw compressor, the shaft plug is provided with the plurality of ventilation through holes, and the filter element is made of the ventilation material, so that gas can be smoothly guided out of the oil seal assembly through the rotor during unloading, and meanwhile, the filter element is made of the oil blocking material, so that lubricating oil can be well prevented from entering the rotor chamber; the gas that is dredged plays certain pressure release effect, has balanced the negative pressure of rotor chamber effectively, and greatly reduced rotor chamber's air current adsorption capacity makes the lubricating oil in the lubrication chamber more difficult to flow into in the rotor chamber.

Preferably, a blocking cover is coaxially arranged outside the shaft plug, one end of the blocking cover, which is far away from the threaded portion, is opened, the other end of the blocking cover is hermetically connected with the threaded portion, the shaft plug is in clearance fit with the side surface of the blocking cover, and the threaded portion of the shaft plug extends out of the blocking cover. This setting is usable keeps off the cover and blocks impurity such as oil mist to can prevent that lubricating oil is too much and lead to the filter core to soak too much and influence the gas permeability, and set up the clearance between axle stifled and the fender cover, can ensure the gas permeability.

Preferably, the shaft plug comprises a large head and a screw connected with the large head, the threaded portion is arranged on the screw, the first groove is arranged on the large head, the caliber of the first through hole is smaller than that of the first groove and used for forming a T-shaped stepped hole, one end of the filter element abuts against a stepped surface of the T-shaped stepped hole, and the other end of the filter element abuts against the cover plate. The filter element can be conveniently installed and positioned.

Preferably, the anti-theft device further comprises a check ring arranged above the cover plate, and a stop block used for limiting the check ring is arranged on the large head and used for clamping the check ring between the cover plate and the stop block. The retainer ring is arranged, so that the cover plate and the filter element are pressed more tightly, and the cover plate has better sealing effect on the filter element.

Preferably, the retainer ring is a C-shaped retainer ring. The C-shaped retainer ring has certain elasticity, can be arranged in the large head part through elastic deformation, and is very convenient to mount.

The utility model also aims to solve the technical problems that: the ventilation structure of the oil-free screw compressor can effectively balance the negative pressure of the rotor chamber during unloading, so that lubricating oil in the lubricating chamber is difficult to flow into the rotor chamber.

The technical solution of the utility model is as follows: the utility model provides an oil-free screw compressor's ventilative structure, includes the casing and sets up the rotor chamber in the casing, one side that just is located the rotor chamber in the casing is the lubricated room of side of admitting air, and the opposite side is the lubricated room of exhaust side, the indoor negative rotor and the positive rotor that are equipped with a pair of non-contact mode meshing of rotor, the lubricated room of side of admitting air is equipped with the air inlet, the lubricated room of side of exhaust is equipped with the gas vent that is linked together with the rotor chamber, its characterized in that: the air inlet side and/or the air outlet side of the female rotor and/or the male rotor are/is provided with the oil seal assembly, the thread part of the oil seal assembly is in threaded connection with the air inlet side or the air outlet side of the corresponding rotor, and the first through hole of the oil seal assembly is communicated with the rotor chamber through an air flow channel arranged on the corresponding rotor.

After adopting the structure, the utility model has the following advantages:

when the air permeable structure of the oil-free screw compressor is unloaded, gas absorbed by the air inlet side lubricating chamber and the air exhaust side lubricating chamber can enter the rotor through the oil seal assembly, lubricating oil carried by the absorbed gas is blocked outside the oil seal assembly, the gas absorbed to the rotor from the lubricating chamber is communicated with the rotor chamber through the airflow channel on the rotor and is finally exhausted through the air exhaust port on the air exhaust side communicated with the rotor chamber; therefore, when the air permeable structure is unloaded, gas can be smoothly guided out of the device through the rotor, lubricating oil can be well separated out of the rotor chamber, the guided gas plays a certain pressure relief effect, the negative pressure of the rotor chamber is effectively balanced, the air flow adsorption capacity of the rotor chamber is greatly reduced, and the lubricating oil in the lubricating chamber is enabled to be less prone to flowing into the rotor chamber.

Preferably, a driving device is arranged on the air inlet side or the air outlet side of one of the female rotor and the male rotor, the oil seal assembly is arranged on the air inlet side and the air outlet side of the other rotor, and the oil seal assembly is also arranged on the side, far away from the driving device, of the rotor provided with the driving device. This setting can balance the negative pressure of rotor chamber better, and it is indoor to be more difficult for making lubricating oil enter into the rotor.

Preferably, a clamping hoop is arranged in the lubricating chamber provided with the oil seal assembly and used for clamping one end, far away from the threaded part, of the oil seal assembly. This arrangement makes the installation of the oil seal assembly more secure.

Preferably, a second groove is arranged in the lubricating chamber provided with the oil seal assembly and used for clamping one end of the oil seal assembly away from the threaded part. This arrangement makes the installation of the oil seal assembly more secure.

Description of the drawings:

fig. 1 is a sectional view of an oil seal assembly of an oil-free screw compressor in embodiment 1;

FIG. 2 is a schematic structural view of a shaft plug of an oil seal assembly of the oil-free screw compressor in embodiment 1;

FIG. 3 is a schematic view showing the structure of a gas permeable structure of an oil-free screw compressor in example 2;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

in the figure: 1-shaft plug, 2-filter element, 3-cover plate, 4-thread part, 5-clamp, 6-first groove, 7-first through hole, 8-second through hole, 9-ventilation through hole, 10-baffle cover, 11-opening, 12-big head, 13-screw rod, 14-step surface, 15-baffle ring, 16-baffle block, 17-shell, 18-rotor chamber, 19-air inlet side lubricating chamber, 20-air outlet side lubricating chamber, 21-female rotor, 22-male rotor, 23-second groove and 24-oil seal component.

Detailed Description

The utility model is further described with reference to the following embodiments in conjunction with the accompanying drawings.

Example 1:

the utility model provides an oil blanket subassembly that does not have oily screw compressor, includes that the axle blocks 1, filter core 2 and apron 3, the one end of axle blocks 1 is equipped with and is used for the screw thread portion 4 that links to each other with the rotor, and the coaxial first recess 6 that is used for installing filter core 2 that sets up in the other end, the coaxial first through-hole 7 that is linked together with first recess 6 that sets up in the screw thread portion 4, filter core 2 is installed in the first recess 6 of axle blocks 1 and the coaxial second through-hole 8 that is linked together with first through-hole 7 that sets up, the airtight lid of apron 3 closes the top at filter core 2, the region that the side of axle blocks 1 is located filter core 2 and covers is equipped with a plurality of ventilation hole 9, filter core 2 is for hindering oily ventilation material and makes and compress tightly closed all ventilation hole 9, and filter core 2 can adopt the felt to make.

during the uninstallation, because rotor chamber 18 is the negative pressure, can adsorb the air current of carrying a small amount of lubricating oil in the lubrication chamber, the air current is before adsorbing rotor chamber 18, because there are a plurality of ventilative through-holes 9 and filter core 2 for hindering oily ventilative material on the shaft plug 1, can make gas enter into the rotor through ventilative through-hole 9 and filter core 2 of shaft plug 1, and lubricating oil can receive blockking of filter core 2 and can't enter into the rotor in, the air current that adsorbs in the rotor through oil-gas separation passes through corresponding air flow channel again, can the eduction gear outside.

According to the oil seal assembly of the oil-free screw compressor, the shaft plug 1 is provided with the plurality of ventilation through holes 9, and the filter element 2 is made of the ventilation material, so that gas can be smoothly guided out of the oil seal assembly through the rotor during unloading, and meanwhile, the filter element 2 is made of the oil blocking material, so that lubricating oil can be well prevented from entering the rotor chamber 18; the gas which is guided has a certain pressure relief effect, the negative pressure of the rotor chamber 18 is effectively balanced, the air flow adsorption capacity of the rotor chamber 18 is greatly reduced, and the lubricating oil in the lubricating chamber is more difficult to flow into the rotor chamber 18.

Preferably, a blocking cover 10 is coaxially arranged outside the shaft plug 1, an opening 11 is formed in one end, away from the threaded portion 4, of the blocking cover 10, the other end of the blocking cover is hermetically connected with the threaded portion 4, the shaft plug 1 is in clearance fit with the side face of the blocking cover 10, and the threaded portion 4 of the shaft plug 1 extends out of the blocking cover 10. The arrangement can utilize the blocking cover 10 to block impurities such as oil mist and the like, can prevent the filter element 2 from being soaked too much due to too much lubricating oil to influence air permeability, and can ensure the air permeability by arranging a gap between the shaft plug 1 and the blocking cover 10.

Preferably, the shaft plug 1 comprises a large head 12 and a screw 13 connected with the large head 12, the thread portion 4 is arranged on the screw 13, the first groove 6 is arranged on the large head 12, the caliber of the first through hole 7 is smaller than that of the first groove 6 to form a T-shaped stepped hole, one end of the filter element 2 abuts against a stepped surface 14 of the T-shaped stepped hole, and the other end of the filter element abuts against the cover plate 3. This arrangement facilitates installation and positioning of the filter element 2.

Preferably, the cover plate further comprises a retainer ring 15 arranged above the cover plate 3, and the large head 12 is provided with a stopper 16 for limiting the retainer ring 15, so that the retainer ring 15 is clamped between the cover plate 3 and the stopper 16. The retainer ring 15 is arranged, so that the cover plate 3 and the filter element 2 are pressed more tightly, and the sealing effect of the cover plate 3 on the filter element 2 is better.

Preferably, the retainer ring 15 is a C-shaped retainer ring 15. The C-shaped retainer ring 15 has certain elasticity, can be installed in the large head part 12 through elastic deformation, and is very convenient to install.

Example 2:

the utility model provides an oil-free screw compressor's ventilative structure, includes casing 17 and the rotor chamber 18 of setting in casing 17, one side that just is located rotor chamber 18 in casing 17 is the lubricated room 19 of side of admitting air, and the opposite side is the lubricated room 20 of exhaust side, be equipped with the female rotor 21 and the male rotor 22 of a pair of non-contact mode meshing in the rotor chamber 18, the lubricated room 19 of side of admitting air is equipped with the air inlet, the lubricated room 20 of side of exhaust side is equipped with the gas vent that is linked together with rotor chamber 18, the setting of air inlet and gas vent adopts prior art can, no longer gives the signal in the figure, the side of admitting air and/or the side of giving vent to anger of female rotor 21 and/or male rotor 22 are equipped with oil blanket assembly 24 described in embodiment 1, the screw thread portion 4 of oil blanket assembly 24 is connected with the side of admitting air or the side of giving vent to anger of corresponding rotor thread, the first through-hole 7 of oil blanket assembly 24 is linked together with rotor chamber 18 through the air flow channel that sets up on corresponding rotor, the airflow direction is shown by the arrows in fig. 4.

When the air permeable structure of the oil-free screw compressor is unloaded, gas absorbed by the air inlet side lubricating chamber 19 and the air exhaust side lubricating chamber 20 can enter the rotor through the oil seal assembly 24, lubricating oil carried by the absorbed gas is blocked outside the oil seal assembly 24, the gas absorbed on the rotor from the lubricating chambers is communicated with the rotor chamber 18 through an airflow channel on the rotor and is finally exhausted through an air exhaust port on the air exhaust side communicated with the rotor chamber 18; therefore, when the ventilation structure is unloaded, gas can be smoothly conducted to the outside of the device through the rotor chamber 18, lubricating oil can be well blocked outside the rotor chamber 18, the conducted gas plays a certain pressure relief role, negative pressure of the rotor chamber 18 is effectively balanced, air flow adsorption capacity of the rotor chamber 18 is greatly reduced, and the lubricating oil in the lubricating chamber is more difficult to flow into the rotor chamber 18.

Preferably, a driving device is arranged on the air inlet side or the air outlet side of one of the female rotor 21 and the male rotor 22, the oil seal assembly 24 in the embodiment 1 is arranged on the air inlet side and the air outlet side of the other rotor, and the oil seal assembly 24 in the embodiment 1 is also arranged on the side, away from the driving device, of the rotor provided with the driving device; in the present embodiment, a driving device is provided on the exhaust side of the female rotor 21, the driving device is a conventional one, and not shown in the figure, and the oil seal assemblies 24 described in embodiment 1 are provided on the intake side of the female rotor 21, the intake side of the male rotor 22, and the exhaust side. This arrangement can better balance the negative pressure of rotor chamber 18 and make it less likely that lubricating oil will enter rotor chamber 18.

Preferably, a clamp 5 is arranged in the lubricating chamber provided with the oil seal assembly 24 and used for clamping one end of the oil seal assembly 24 far away from the threaded part 4, and the clamp 5 can be realized by adopting the prior art. This arrangement may allow for a more secure mounting of the oil seal assembly 24.

Preferably, a second groove 23 is provided in the lubrication chamber where the oil seal assembly 24 is provided for catching an end of the oil seal assembly 24 away from the threaded portion 4. This arrangement may allow for a more secure mounting of the oil seal assembly 24. In the present embodiment, the clip 5 is provided on the intake side, and the second groove 23 is provided on the exhaust side.

Claims

1. The utility model provides an oil blanket subassembly of oil-free helical-lobe compressor which characterized in that: including axle stifled (1), filter core (2) and apron (3), the one end of axle stifled (1) is equipped with screw thread portion (4) that are used for linking to each other with the rotor, and the coaxial first recess (6) that are used for installing filter core (2) that set up in other end, coaxial setting and first recess (6) first through-hole (7) that are linked together in screw thread portion (4), install in first recess (6) of axle stifled (1) filter core (2) and coaxial setting second through-hole (8) that are linked together with first through-hole (7), the top at filter core (2) is closed in apron (3) airtight lid, the region that the side of axle stifled (1) is located filter core (2) cover is equipped with a plurality of ventilation hole (9), filter core (2) are for hindering oily ventilative material and make and compress tightly closed all ventilation hole (9).

2. An oil seal assembly of an oil-free screw compressor according to claim 1, wherein: the shaft plug (1) is coaxially provided with a blocking cover (10), the blocking cover (10) is far away from one end opening (11) of the threaded portion (4), the other end of the blocking cover is hermetically connected with the threaded portion (4), the shaft plug (1) is in clearance fit with the side face of the blocking cover (10), and the threaded portion (4) of the shaft plug (1) extends out of the blocking cover (10).

3. An oil seal assembly of an oil-free screw compressor according to claim 1, wherein: the shaft plug (1) comprises a large head (12) and a screw (13) connected with the large head (12), the thread portion (4) is arranged on the screw (13), the first groove (6) is arranged on the large head (12), the caliber of the first through hole (7) is smaller than that of the first groove (6) and is used for forming a T-shaped stepped hole, one end of the filter element (2) is abutted to a stepped surface (14) of the T-shaped stepped hole, and the other end of the filter element is abutted to the cover plate (3).

4. An oil seal assembly of an oil-free screw compressor according to claim 1, wherein: the anti-theft device is characterized by further comprising a check ring (15) arranged above the cover plate (3), wherein a stop block (16) used for limiting the check ring (15) is arranged on the large head portion (12) and used for clamping the check ring (15) between the cover plate (3) and the stop block (16).

5. An oil seal assembly of an oil-free screw compressor according to claim 4, wherein: the retainer ring (15) is a C-shaped retainer ring (15).

6. The utility model provides an oil-free screw compressor's ventilative structure, includes casing (17) and sets up rotor chamber (18) in casing (17), one side that just is located rotor chamber (18) in casing (17) is the lubricated room (19) of side of admitting air, and the opposite side is the lubricated room (20) of exhaust side, be equipped with female rotor (21) and male rotor (22) of a pair of non-contact mode meshing in rotor chamber (18), the lubricated room (19) of side of admitting air is equipped with the air inlet, the lubricated room (20) of exhaust side is equipped with the gas vent that is linked together with rotor chamber (18), its characterized in that: the air inlet side and/or the air outlet side of the female rotor (21) and/or the male rotor (22) are/is provided with any one of the oil seal assemblies (24) in the claims 1 to 5, the threaded part (4) of the oil seal assembly (24) is in threaded connection with the air inlet side or the air outlet side of the corresponding rotor, and the first through hole (7) of the oil seal assembly (24) is communicated with the rotor chamber (18) through an air flow channel arranged on the corresponding rotor.

7. An oil-free screw compressor air-permeable structure according to claim 6, wherein: the inlet side or outlet side of one of the female rotor (21) and male rotor (22) is provided with a drive means, the inlet side and outlet side of the other rotor is provided with an oil seal assembly (24) as claimed in any one of claims 1 to 5, and the rotor provided with the drive means is also provided with an oil seal assembly (24) as claimed in any one of claims 1 to 5 on the side away from the drive means.

8. An oil-free screw compressor air-permeable structure according to claim 6, wherein: a clamping hoop (5) is arranged in the lubricating chamber provided with the oil seal assembly (24) and used for clamping one end, far away from the thread part (4), of the oil seal assembly (24).

9. An oil-free screw compressor air-permeable structure according to claim 6, wherein: and a second groove (23) is arranged in the lubricating chamber provided with the oil seal assembly (24) and is used for clamping one end, far away from the thread part (4), of the oil seal assembly (24).