Connection structure of exhaust bearing seat for compressor and screw compressor

Disclosed is a connection structure of an exhaust bearing seat for compressors and screw compressors, designed to solve the problem of large radial vibration of the existing exhaust-end bearing seat. The connection structure includes an exhaust bearing seat, an oil separation bucket, and an oil separation screen assembly all arranged at an exhaust end of a body of the compressor, wherein a tail end of the exhaust bearing seat is connected with the oil separation screen assembly, and an outer periphery of the oil separation screen assembly is provided with a vibration-reducing element, which is connected to an inner wall of the oil separation bucket. The vibration of the exhaust bearing seat is transmitted to the vibration-reducing element through the oil separation screen assembly, and then to the oil separation bucket after being absorbed and suppressed by the vibration-reducing element.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the United States national phase of International Application No. PCT/CN2016/103381 filed Oct. 26, 2016, and claims priority to Chinese Patent Application No. 201510860022.X filed Nov. 30, 2015, the disclosures of which are hereby incorporated in their entirety by reference.

BACKGROUND OF THE INVENTION

Field Of The Invention

The present disclosure relates to the field of compressors, and in particular to a connection structure of an exhaust bearing seat for a compressor and a screw compressor.

Description Of Related Art

An exhaust-end bearing seat, as an important casting of a screw compressor, not only functions to support a rotor, but also acts as an exhaust channel of the compressed gas.

However, during operation of the screw compressor, the intermittent opening/closing of the exhaust port generates a complex gas pulsation, and the gas pulsation acts on the bearing seat to cause high frequency vibration of the latter, which is disadvantageous to stable operation of the rotor. As shown inFIG. 1, a tail portion of an exhaust-end bearing seat2′ connected with a body1′ of the screw compressor is connected to an oil separation screen4′ through a spacer pipe8′, such that vibration of the bearing seat2′ causes the oil separation screen4′ to vibrate. The oil separation screen4′ becomes very heavy due to high content of lubricating oil, and suspension of the heavy oil separation screen4′ on the tail portion of the bearing seat2′ cause greater vibration of the bearing seat2′.

The above-mentioned connection structure of the bearing seat is equivalent to suspension of a large mass at the tail portion of the bearing seat2′ (the oil separation screen4′ contains heavy oil). Although the oil separation screen4′ is in contact with an oil separation bucket3′, as the oil separation screen4′ is very soft, it does not play a load-bearing role; instead, it increases the radial vibration displacement of the bearing seat2′. Such connection structure of the bearing seat causes a variety of hazards, such as reduced service life of the bearing due to misalignment, scratch of the rotor and slide valves, abnormal noise of the screw compressor, and even machine run-down and motor burnout, etc.

SUMMARY OF THE INVENTION

An object of the present disclosure is to provide a connection structure of an exhaust bearing seat that reduces the radial vibration of the exhaust-end bearing seat.

Another object of the present disclosure is to provide a screw compressor with a small radial vibration at the exhaust-end bearing seat, long service life and wide application scope.

The present disclosure proposes the following technical solution in some embodiments:

The present disclosure provides in some embodiments a connection structure of an exhaust bearing seat for a compressor, comprising an exhaust bearing seat, an oil separation bucket, and an oil separation screen assembly all arranged at an exhaust end of a body of the compressor, wherein a tail end of the exhaust bearing seat is connected with the oil separation screen assembly, and a vibration-reducing element is provided between the oil separation screen assembly and the oil separation bucket.

As an alternative embodiment, the vibration-reducing element is provided on an outer periphery of the oil separation screen assembly and is connected with an inner wall of the oil separation bucket.

As an alternative embodiment, the vibration-reducing element is provided with a cavity.

As an alternative embodiment, the vibration-reducing element is made of a plastic material provided therein with a plurality of cavities communicating with one another.

As an alternative embodiment, the plastic material includes rubber.

As an alternative embodiment, a support is provided on at least one side of the oil separation screen assembly, and the vibration-reducing element is connected to the support and the oil separation screen assembly.

Further, a porous support plate is provided on at least one side of the oil separation screen assembly, and the vibration-reducing element is fitted over an outer periphery of the porous support plate and the oil separation screen assembly.

Further, the porous support plate is in an interference fit with the vibration-reducing element.

Further, materials of the porous support plate comprise steel, iron, or aluminum alloy.

Further, a retaining ring is provided on the inner wall of the oil separation bucket and is connected to the vibration-reducing element.

Further, wherein the vibration-reducing element includes an annular sheathing portion, and a connection portion is formed by radially inward extension of an end of the annular sheathing portion towards the retaining ring; the annular sheathing portion is fitted over the outer periphery of the oil separation screen assembly, and the connection portion is connected with the retaining ring.

Further, a tail end of the exhaust bearing seat is connected with the oil separation screen assembly through a spacing mechanism, which is adapted to maintain a certain distance between the exhaust bearing seat and the oil separation screen assembly.

Further, the spacing mechanism comprises a screw rod, and a spacer pipe disposed between the tail end of the exhaust bearing seat and the oil separation screen assembly, wherein the screw rod penetrates through the oil separation screen assembly and is threadedly connected in the spacer pipe.

On the other hand, the present disclosure proposes the following technical solution in some embodiments:

The present disclosure provides in another embodiment a screw compressor, which is provided with any one of the connection structure of an exhaust bearing seat for a compressor as stated above.

The embodiments of the present disclosure are beneficial in that:

In the connection structure of an exhaust bearing seat for a compressor provided in embodiments of the present disclosure, the tail end of the exhaust bearing seat is connected with the oil separation screen assembly, and the oil separation screen assembly is connected to the oil separation bucket through the vibration-reducing element provided on its outer periphery. In this way, vibration of the exhaust bearing seat is transmitted to the vibration-reducing element through the oil separation screen assembly, and then to the oil separation bucket after being absorbed by the vibration-reducing element, which is equivalent to exerting an elastic support on the exhaust bearing seat, thereby capable of obviously suppressing radial vibration of the tail portion of the exhaust bearing seat, improving the rotor to rotate stably, and avoiding the problems of scratch of the rotor, abnormal noise of the compressor and the like.

In the screw compressor provided in embodiments of the present disclosure, owing to the adoption of the above-mentioned connection structure of an exhaust bearing seat for a compressor, the radial vibration at the exhaust-end bearing seat is reduced, the rotor rotates more stably, and the compressor is rendered with longer service life and wider application scope.

DESCRIPTION OF THE INVENTION

The technical solution of the present disclosure will be further described as below in combination with the drawings through the specific embodiments.

The present embodiment provides a connection structure of an exhaust bearing seat for a compressor, which as shown inFIGS. 2-5, comprises an exhaust bearing seat2, an oil separation bucket3, and an oil separation screen assembly4all arranged at an exhaust end of a body1of the compressor. Referring toFIG. 2, a tail end of the exhaust bearing seat2is connected with the oil separation screen assembly4, and an outer periphery of the oil separation screen assembly4is provided with a vibration-reducing element6, which is connected with an inner wall of the oil separation bucket3.

The exhaust bearing seat2, the oil separation bucket3, and the oil separation screen assembly4are all arranged at the exhaust end of the body1of the compressor. Specifically, the exhaust bearing seat2is disposed at the exhaust end of the body1of the compressor, the oil separation screen assembly4is connected with the tail end of the exhaust bearing seat2, and the vibration-reducing element6on the outer periphery of the oil separation screen assembly4is connected with the inner wall of the oil separation bucket3. Taking the direction shown inFIG. 4as an example, gas is discharged into a left chamber of the oil separation bucket3via an exhaust pipe10, then turns back and passes through a porous support plate7and is finally discharged through an exhaust port on a housing of the oil separation bucket3.

In an alternative or preferred embodiment, a vibration-reducing element6is provided between the oil separation screen assembly4and the oil separation bucket3. The specific structural forms and position of the vibration-reducing element6is arranged in various means.

In some embodiments, the vibration-reducing element6has a ring structure or other structures. One or more vibration-reducing elements6are provided.

In an alternative or preferred embodiment, the vibration-reducing element6is provided with cavities63for reducing vibration. The individual cavities63communicate or not communicate with each other, and have identical or different structures.

In some embodiments, the vibration-reducing element6is disposed between the outer periphery of the oil separation screen assembly4and the inner wall of the oil separation bucket3. The vibration-reducing element6is fixed to either of the oil separation screen assembly4and the oil separation bucket3and is in tight-fitting with the other one, or is fixed to both of them, or detachably connected to both of them.

In the present embodiment, the tail end of the exhaust bearing seat2is connected with the oil separation screen assembly4, and the oil separation screen assembly4is connected to the oil separation bucket3through the vibration-reducing element6provided on its outer periphery. In this way, vibration of the exhaust bearing seat2is transmitted to the vibration-reducing element6through the oil separation screen assembly4, and then to the oil separation bucket3after being absorbed by the vibration-reducing element6, which is equivalent to exerting an elastic support on the exhaust bearing seat2, thereby capable of obviously suppressing radial vibration of the tail portion of the exhaust bearing seat2, improving the rotor to rotate stably, and avoiding the problems of scratch of the rotor, abnormal noise of the compressor and the like.

As an alternative embodiment, the vibration-reducing element6is made of a rubber material provided therein with a plurality of cavities63communicating with one another. The cavities63of the porous rubber are equivalent to damping cavities63, which further serve to attenuate the radial vibration displacement. Of course, the vibration-reducing element6is not limited to the above-mentioned material, and is made of other materials having an appropriate vibration reducing effect, such as rubber.

In some embodiments, the vibration-reducing element6has a honeycomb structure. The vibration-reducing element6is made of rubber, spring steel or other materials having vibration reducing effect.

As an alternative embodiment, a support is provided exteriorly to at least one side of the oil separation screen assembly4, and the vibration-reducing element6is connected to the support and the oil separation screen assembly. The support has a variety of structural forms.

As a further embodiment, referring toFIG. 4andFIG. 5, the porous support plate7is provided on both sides of the oil separation screen assembly4, and the vibration-reducing element6is fitted over the outer periphery of the porous support plate7and the oil separation screen assembly4.

The porous support plate7not only serves to support and fix the oil separation screen assembly4, but more importantly, transmits more effectively the vibration of the oil separation screen assembly4to the vibration-reducing element6.

In some embodiments, the porous support plate7is provided exteriorly to both sides of the oil separation screen assembly4, or is provided exteriorly to only one side of the oil separation screen assembly4.

Referring toFIG. 4andFIG. 5, the porous support plate7is provided with pores that penetrate in a thickness direction of the support plate7, and two or more of the pores are provided.

Referring toFIG. 4andFIG. 5, alternatively, at least one of the porous support plates7is in interference fit with the vibration-reducing element6so as to transmit vibration more effectively.

In addition, alternatively, the porous support plate7is closely attached to the outside of the oil separation screen assembly4. The porous support plate7is closely attached to the surface of the oil separation screen assembly4, and the two porous support plates7sandwich the oil separation screen assembly4in between.

More specifically, the porous support plate7is a porous steel plate, but it is not limited to a porous steel plate and is made of other materials having an appropriate hardness, such as iron, aluminum alloy, or the like. The porous support plate7made of steel plate material is convenient for drawing and processing of materials.

In one or more embodiments, they are also optional to provide the porous supporting plate7exteriorly to one side of the oil separation screen assembly4, and bring the porous supporting plate7into interference fit with the vibration-reducing element6.

Further, as shown inFIG. 3andFIG. 5, the inner wall of the oil separation bucket3is provided with a retaining ring5, to which the vibration-reducing element6is connected.

More specifically, the vibration-reducing element6includes an annular sheathing portion61, and a connection portion62formed by radially inward extension of the annular sheathing portion61towards an end of the retaining ring5. The annular sheathing portion61is adapted to be fitted over the outer periphery of the oil separation screen assembly4, and the connection portion62is adapted to be connected to the retaining ring5.

The vibration-reducing element6includes the annular sheathing portion61and the connection portion62, and the connection portion62is formed by radially inward extension of the annular sheathing portion61towards an end of the retaining ring5. The vibration-reducing element6with such structural form is an integrated structure, which is compact and easy to install.

In some embodiments, the retaining ring5is integrally formed with the oil separation bucket3, or is fixed to the oil separation bucket3by welding or the like.

The height of the retaining ring5is set as actually required, and the connection portion62is connected to the retaining ring5through a screw9, a bolt or the like.

In addition, in the present disclosure, it is also possible to connect the vibration-reducing element6and the oil separation bucket3by providing at least two annularly-distributed baffle units on the inner wall of the oil separation bucket3.

As some embodiments, the tail end of the exhaust bearing seat2is connected with the oil separation screen assembly4through a spacing mechanism, which is adapted to maintain a predetermined distance between the exhaust bearing seat2and the oil separation screen assembly4.

More specifically, the spacing mechanism includes a screw rod11, and a spacer pipe8disposed between the exhaust bearing seat2and the oil separation screen assembly4. The screw rod11is used for penetrating through the oil separation screen assembly4to be threadedly connected in the spacer pipe8such that the oil separation screen assembly4is connected to the tail end of the exhaust bearing seat2.

In some embodiments where the porous support plate7is provided, the screw rod11penetrates through the porous support plate7and the oil separation screen assembly4in order before being threadedly connected in the spacer pipe8, thereby fixing the porous support plate7and the oil separation screen assembly4together. In addition, the porous support plate7and the oil separation screen assembly4is also separately connected by means of other connectors. In some embodiments, the number of the spacer pipe8and the screw rod11is set as actually required.

The working principle of some embodiments is as follows:FIG. 6shows a simplified model of the connection structure of an exhaust bearing seat for a compressor provided in some embodiments, in which the exhaust bearing seat1is equivalent to a cantilever beam, the oil separation screen assembly4is equivalent to a mass M, the porous support plate7is stiffness K1, and the vibration-reducing element6is equivalent to parallel-connection treatment of stiffness K2and damping C; thus, it is equivalent to adding a vibration-reducing device between the exhaust bearing seat1and the oil separation bucket2; the radial vibration of the exhaust bearing seat is effectively reduced by properly designing M, K1, K2and C.

The present disclosure provides in some embodiments a screw compressor, which is provided with the connection structure of an exhaust bearing seat for a compressor as described in some embodiments.

In the screw compressor provided in some embodiments of the present disclosure, owing to the adoption of the above-mentioned connection structure of an exhaust bearing seat for a compressor, the radial vibration at the exhaust-end bearing seat is reduced, the rotor rotates more stably, and the compressor is rendered with longer service life and wider application scope.

The technical principle of the present disclosure has been described above with reference to specific embodiments. These descriptions are intended only to explain the principle of the present disclosure and are not interpreted in any way as limiting the scope of protection of the present disclosure. Based on the explanation herein, those skilled in the art envisage other specific embodiments of the present disclosure without involving any inventive effort, and all of these embodiments fall into the protection scope of the present disclosure.