CN215058163U

CN215058163U - Two-stage screw compressor cylinder

Info

Publication number: CN215058163U
Application number: CN202120730312.3U
Authority: CN
Inventors: 邬剑波; 张炯焱; 王立光; 顾礼照
Original assignee: Ningbo Baosi Energy Equipment Co Ltd
Current assignee: Ningbo Baosi Energy Equipment Co Ltd
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2021-12-07
Anticipated expiration: 2031-04-12

Abstract

A two-stage screw compressor cylinder is characterized in that: the structure comprises a cylinder body, wherein a primary compression chamber, a secondary compression chamber, an interstage accommodating cavity and a transmission chamber are arranged in the cylinder body; the same direction ends of the first-stage compression chamber, the second-stage compression chamber and the interstage accommodating cavity are communicated with the transmission cavity, and an air cylinder interstage clapboard is arranged in the interstage accommodating cavity; the cylinder interstage clapboard is provided with a main shaft bearing mounting hole near the end of the transmission cavity, and the second stage compression cavity is provided with a second stage inlet end bearing mounting hole near the end of the transmission cavity. The compressor has the advantages of simple circulation track of the gas-liquid mixture from the first level to the second level, simplification of the overall oil circuit, simpler overall structure, more compact appearance and reduction of the processing and assembling process requirements of the compressor.

Description

Two-stage screw compressor cylinder

Technical Field

The application relates to the technical field of oil injection screw compressors, in particular to a two-stage screw compressor cylinder.

Background

The screw compressor is a relatively common device in industrial application, and generally comprises a single-stage screw compressor, a two-stage screw compressor, a three-stage screw compressor and the like; at present, in order to achieve a better energy-saving effect in the market, the two-stage screw compressor is widely applied, and the main structure of the two-stage screw compressor can be divided into an upper vertical structure, a lower vertical structure, a left horizontal structure, a right horizontal structure and other structures. In a conventional two-stage screw compressor with an upper vertical structure and a lower vertical structure in the market, the exhaust cavities of the first stage and the second stage are generally on the same side, so that the flow path from the gas-liquid mixture discharged from the first stage to the second stage is S-shaped; therefore, in order to meet the requirements of lubrication of a rotor, a bearing, a gear and other parts, the compressor can be designed with a complex oil path structure or an external oil pipe; in addition, a rotor cavity (a cavity where a male rotor and a female rotor are located) and a transmission cavity (a gear transmission cavity) of the compressor are respectively closed structures, and a plurality of oil ways and oil way structures are required to be arranged for lubricating parts (a primary cavity, a secondary cavity and the transmission cavity) in different cavities; in conclusion, the conventional screw compressor with the upper and lower vertical structures has great design limitation, long gas-liquid mixture circulation track between the first stage and the second stage, complex oil path and high processing and assembling requirements; in addition, because different cavities set up different oil circuits, every cavity all has the entering of oil, if in the one-level compression cavity, if the oil can not timely discharge can cause to block up to whole equipment, operation difficulty etc. not enough, cause the damage to the compressor, in order to overcome above-mentioned not enough, will set up oil return device, and oil return device's setting has certainly improved the complexity of structure.

SUMMERY OF THE UTILITY MODEL

The application is directed against the above-mentioned not enough of prior art, provides a one-level to the gas-liquid mixture circulation orbit of second grade simple, and the oil circuit of totality is simplified, and overall structure is also simpler, and the appearance is compacter, reduces the processing of compressor and the doublestage screw compressor cylinder that the assembly process required.

In order to solve the technical problem, the technical scheme adopted by the application is as follows: a double-stage screw compressor cylinder comprises a cylinder body, wherein a first-stage compression chamber, a second-stage compression chamber, an interstage accommodating cavity and a transmission chamber are arranged in the cylinder body; the end of the first-stage compression chamber, the end of the second-stage compression chamber and the end of the interstage containing cavity in the same direction are communicated with the transmission cavity, an air cylinder interstage clapboard is arranged in the interstage containing cavity, the end of the first-stage compression chamber, which is close to the transmission cavity, is provided with a first-stage exhaust seat mounting position, the end of the air cylinder interstage clapboard, which is close to the transmission cavity, is provided with a main shaft bearing mounting hole, and the end of the second-stage compression chamber, which is close to the transmission cavity, is provided with a second-stage inlet end bearing mounting hole.

By adopting the structure, the exhaust cavity of the first-stage rotor of the two-stage screw compressor, namely the cavity formed by the position of the first-stage exhaust seat, is arranged in the transmission cavity of the shell (cylinder), the receiving cavity between the cylinder stages is communicated with the transmission cavity, and the cylinder stage side is provided with the cylinder stage partition plate, the main shaft bearing mounting hole and the second-stage bearing mounting hole; the structure changes the circulation track of the gas-liquid mixture in the traditional shell: the traditional first-stage and second-stage exhaust cavities are arranged on the same side, a gas-liquid mixture flows out from one end of the first-stage exhaust cavity and then enters the second-stage air inlet from the other end, then flows into the second-stage compression cavity for compression, and then flows to the end of the second-stage exhaust cavity on the same side as the first-stage exhaust cavity for discharge, so that an S-shaped circulation track is formed, the whole circulation track is complex and the steering is variable, and in the structure, different oil paths are required to be arranged in the cavities corresponding to the first stage and the second stage and in the transmission cavity to realize oil injection in each cavity; after the cylinder with the structure is adopted, the flowing track of the liquid-liquid mixture discharged from the first stage is that the liquid-liquid mixture directly enters the gas inlet end of the second stage at the same side from the same end of the gas discharging cavity of the first stage rotor through the accommodating cavity between the stages of the cylinder under the guide of the partition plate and then realizes the compression flow in the second stage compression cavity, therefore, the gas-liquid mixture flow path in the cylinder with the structure is similar to a C-shaped flow path under the guidance of the exhaust and intake ports at the same end of the first stage and the second stage and the interstage clapboard of the middle cylinder, the circulation track can respectively lubricate transmission parts (parts such as a main shaft, a gear and the like in a transmission cavity) and part of bearings (primary and secondary rotor bearings) in the circulation process, the primary and secondary cavities and the transmission cavity are communicated with each other, a plurality of oil paths are not required to be arranged, and the structure of the oil paths is effectively simplified.

Preferably, the cylinder interstage diaphragm is provided with a first inclination angle, and the first inclination angle is formed by gradually inclining downwards from the end far away from the transmission chamber to the end close to the transmission chamber; by adopting the structure, the first inclination angle can play a drainage role on the gas-liquid mixture of the first-stage compression chamber, so that the gas-liquid mixture flows out from the exhaust chamber end of the first-stage rotor, enters the transmission chamber to realize oil supply and lubrication on the transmission part, and then enters the air inlet end of the second-stage compression chamber, thereby realizing the flow guide on the gas-liquid mixture, effectively preventing the accumulation of oil in the channel from influencing the normal operation of the compressor, ensuring that the oil in the chamber can not accumulate on the partition plate, directly entering the transmission chamber to realize the lubrication on the transmission part, and mixing again under the action of the transmission part to enter the second-stage compression chamber.

Further preferably, the cylinder interstage diaphragm is further provided with a second inclination angle, and the second inclination angle is formed by gradually inclining downwards from two sides to the middle of the diaphragm in the width direction; by adopting the structure, the gas-liquid mixture can be concentrated and enriched from the two sides of the width direction of the partition plate or the interstage containing cavity towards the middle direction by the arrangement of the second inclination angle, and the gas-liquid mixture can enter the transmission cavity and the secondary compression cavity more completely by combining the first inclination angle, so that the diversion and the lubrication of parts of the gas-liquid mixture are realized, and the oil gas can be effectively prevented from being accumulated in the upper cavity to damage the whole compressor.

Further preferably, a first chamfer is arranged on the end face of the cylinder interstage partition plate close to the end face of the transmission cavity, and the first chamfer extends downwards from the upper surface of the cylinder interstage partition plate to the end face in an arc shape; namely, an arc-shaped chamfer structure is arranged at the tail end position of the gas-liquid mixture flowing to the transmission chamber on the cylinder interstage partition plate, and the chamfer structure extends downwards from the upper surface to the end surface of the cylinder interstage partition plate in an arc shape, so that the gas-liquid mixture can conveniently enter the transmission chamber when flowing to the position, and the oil backflow phenomenon is not easy to occur even under the vibration state of the motor.

Preferably, a second chamfer is arranged at the joint of the cylinder interstage diaphragm and the inner wall of the cylinder body, and the second chamfer extends downwards in an arc shape from the inner wall of the cylinder body to the upper surface of the cylinder interstage diaphragm; an arc-shaped chamfer structure is formed at the joint of the cylinder interstage partition plate and the inner wall of the cylinder body, the arc is opposite to the arc protruding direction of the first chamfer, the arc-shaped chamfer structure can ensure that gas-liquid mixtures are gathered towards the middle of the partition plate and then smoothly and completely enter the transmission cavity along the inclined direction of the first inclined angle, and the oil backflow phenomenon is not easy to occur even under the vibration state of the motor.

Preferably, the main shaft bearing mounting hole is arranged on the end face, close to the transmission chamber, of the cylinder interstage diaphragm, and the main shaft bearing mounting hole is divided into an upper half main shaft bearing mounting hole and a lower half main shaft bearing mounting hole by the cylinder interstage diaphragm; by adopting the structure, the main shaft bearing mounting hole is fixed on the end surface of the cylinder interstage clapboard, and the connecting area of the main shaft bearing mounting hole and the clapboard is as large as possible, so that the main shaft can be effectively supported, and the running stability of the main shaft is ensured.

Preferably, the spindle bearing mounting hole is a mounting hole formed by an axial through hole, and the inner diameter of the axial through hole is larger than the thickness of the partition plate; the upper half main shaft bearing mounting hole is larger than the lower half main shaft bearing mounting hole; by adopting the structure, because the cylinder with the specific structure does not need to spray oil independently in each chamber, but oil is sprayed in the primary cavity by means of a specific structure to realize the common lubrication of all the cavities, the axial through hole of the bearing mounting hole is arranged, and the inner diameter of the through hole is larger than the thickness of the partition plate, so that a pore for the oil-gas mixture to pass through is formed between the partition plate and the bearing mounting hole, thereby ensuring that the oil-gas mixture completely enters the transmission chamber from the mounting hole of the upper half main shaft bearing in a large flow, then the transmission chamber gets into second grade rotor portion through the extrusion of transmission structure after getting rid of oil, mixing through half main shaft bearing mounting hole again, realizes that the large-traffic complete flow that is C type orbit of oil-gas mixture prevents it from long-pending oil on the baffle to can also effectual improvement to the lubrication action of transmission structure in the transmission chamber.

Preferably, a cylinder interstage diaphragm extends from the outer side wall of the spindle bearing mounting hole, and the inner end face (the end face far away from the transmission chamber) of the spindle bearing mounting hole is connected with the cylinder interstage diaphragm; by adopting the structure, the extension structure of the partition board at the position of the main shaft bearing mounting hole is limited, the extension length of the partition board at the position of the outer side wall of the main shaft bearing mounting hole is larger than that of the partition board at the inner end surface of the main shaft bearing mounting hole, namely the partition board is extended at the position of the outer side of the main shaft bearing mounting hole and is mutually overlapped with the outer side wall of the main shaft bearing mounting hole, the inner end surface of the main shaft bearing mounting hole is not extended and is directly stopped at the inner end surface position to provide enough space for the gear mounting of the main shaft, meanwhile, the extension length of the outer side can guide the oil-gas mixture from the exhaust end of the first-stage compression chamber to the transmission chamber to lubricate the transmission parts firstly, and then into the intake end position of the secondary compression chamber, thus preventing the partition plate from being too short and causing a small or insufficient amount of air-fuel mixture to enter the transmission chamber and cause insufficient lubrication.

Preferably, reinforcing ribs are arranged on the cylinder interstage clapboard and on the side walls of the main shaft bearing mounting hole and the secondary inlet end bearing mounting hole; the setting of this structure had both had additional strengthening's effect, still can guarantee the circulation of oil gas simultaneously again, carries out effectual lubrication to bearing and gear.

Preferably, a primary exhaust seat is arranged on the primary exhaust seat mounting position, and the primary exhaust seat and the cylinder body are integrally formed; the first-stage exhaust seat and the cylinder body are integrally formed, namely the cylinder and the first-stage exhaust seat are integrally formed, the cylinder and the first-stage exhaust seat are not independent parts and do not need a connecting structure, but can be integrally cast by adopting processes such as casting and the like, and because the first-stage exhaust seat is arranged on the cylinder through a screw and a positioning pin if the first-stage exhaust seat is adopted, the processing (concentricity, verticality and position) and assembling requirements of a rotor mounting hole are particularly high, if the processing requirements are not met, the rotor arranged on the cylinder is slightly dislocated, the energy efficiency of a machine is influenced, and even accidents such as cylinder scraping and the like can be seriously caused; in addition, because the first-stage exhaust seat needs to be installed inside the cylinder, the forced oil supply structure of the first-stage exhaust end bearing needs to be designed relatively complexly, and the structure which integrates the first-stage exhaust seat and the cylinder body can effectively avoid the defects.

Preferably, the primary compression chamber is located at the upper part of the cylinder body, the secondary compression chamber is located at the lower part of the cylinder body, the transmission chamber is located at the exhaust end of the primary compression chamber, the interstage accommodating chamber is located between the primary compression chamber and the secondary compression chamber and extends to be communicated with the transmission chamber along the axial direction of the primary compression chamber and the axial direction of the secondary compression chamber, and the primary exhaust seat mounting position, the air inlet end of the secondary compression chamber and the transmission chamber are located at the same end of the interstage accommodating chamber; adopt above-mentioned structure, one-level compression chamber has been realized, the second grade compression chamber, transmission chamber and interstage holding chamber intercommunication each other, and set for one-level exhaust end and second grade inlet end to be located same one side, and all in the space in interstage holding chamber, like this do not need traditional gear box and the isolation end cover between one-level and the second grade host computer, can realize that the inside oil-gas lubrication of whole cylinder body and gas circuit shorten, and can realize that second grade compression chamber and gear box are closer, do benefit to the installation of follow-up tertiary compression host computer, for the tertiary bigger assembly space that holds, the structure is also compacter.

Drawings

Fig. 1 is a schematic perspective view of a cylinder of a two-stage screw compressor according to the present invention (embodiment 1).

Fig. 2 is a schematic structural view of the front view of fig. 1.

Fig. 3 is a schematic structural view of the shaft side sectional view of fig. 1.

FIG. 4 is a schematic perspective view of a two-stage screw compressor cylinder according to the present invention (embodiment 2)

Fig. 5 is a schematic structural diagram of a cross-sectional view corresponding to a first-stage compression chamber in a cylinder of the two-stage screw compressor of fig. 1 (a first-stage exhaust seat is detachably arranged at a first-stage exhaust seat mounting position).

Fig. 6 is a schematic structural diagram of a cross-sectional view corresponding to a first-stage compression chamber in a cylinder of the two-stage screw compressor of fig. 4 (a first-stage exhaust seat is integrally formed at a first-stage exhaust seat mounting position).

As shown in the attached drawings: a. the cylinder comprises a cylinder body, a1. primary compression chambers, a2 secondary compression chambers, a3. interstage containing chambers, a4. transmission chambers, 1 primary exhaust seat mounting positions (primary exhaust chamber mounting positions), 2 axial through holes, 3 cylinder interstage partition plates, 3.1 first inclination angles (inclined planes), 3.2 second inclination angles (inclined planes), 3.3 first chamfers, 3.4 second chamfers, 4 main shaft bearing mounting holes, 4.1 upper half main shaft bearing mounting holes, 4.2 lower half main shaft bearing mounting holes, 5 reinforcing ribs, 6 secondary inlet end bearing mounting holes and 7 primary exhaust seats.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only preferred embodiments, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present invention;

further, it is to be noted that: when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by way of the intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

As shown in fig. 1-2, the two-stage screw compressor cylinder according to the present application includes a cylinder body a, in which a first-stage compression chamber a1, a second-stage compression chamber a2, an interstage accommodation chamber a3, and a transmission chamber a4 are disposed; the end of the first-stage compression chamber a1, the end of the second-stage compression chamber a2 and the end of the interstage accommodating chamber a3 in the same direction are communicated with a transmission chamber a4, an air cylinder interstage diaphragm 3 is arranged in the interstage accommodating chamber a3, a first-stage exhaust seat mounting position 1 is arranged at the end, close to the end of the transmission chamber a4, of the first-stage compression chamber a1, a spindle bearing mounting hole 4 (a spindle of a motor is used for driving a gear in a gear box to rotate so as to drive a male rotor and a female rotor in the first stage and the second stage to rotate and compress air) is arranged at the end, close to the transmission chamber, of the cylinder interstage diaphragm 3, close to the end of the transmission chamber a4, and a second-stage inlet bearing mounting hole is arranged at the end, close to the transmission chamber, of the second-stage compression chamber.

As shown in fig. 3, the cylinder interstage diaphragm 3 of the present application is provided with a first inclination angle 3.1, the first inclination angle is formed by gradually inclining downwards from the end far away from the transmission chamber to the end close to the transmission chamber, as shown in fig. 3, the first inclination angle gradually inclines downwards from the left side to the right side, the end a4 close to the transmission chamber is a low end, and the end a4 far away from the transmission chamber is a high end; by adopting the structure, the first inclination angle can play a drainage role on the gas-liquid mixture of the first-stage compression chamber, so that the gas-liquid mixture flows out from the exhaust chamber end of the first-stage rotor, enters the transmission chamber to realize oil supply and lubrication on the transmission part, and then enters the air inlet end of the second-stage compression chamber, thereby realizing the flow guide on the gas-liquid mixture, effectively preventing the accumulation of oil in the channel from influencing the normal operation of the compressor, ensuring that the oil in the chamber can not accumulate on the partition plate, directly entering the transmission chamber to realize the lubrication on the transmission part, and mixing again under the action of the transmission part to enter the second-stage compression chamber.

As shown in fig. 2, the cylinder interstage diaphragm 3 of the present application is further provided with a second inclination angle 3.2, the second inclination angle is formed by gradually inclining downwards from two sides to the middle of the direction of the width of the diaphragm, as shown in fig. 2, namely inclining from the left and right sides to the middle, the left and right sides being high ends, and the middle being low end; by adopting the structure, the gas-liquid mixture can be concentrated and enriched from the two sides of the width direction of the partition plate or the interstage containing cavity towards the middle direction by the arrangement of the second inclination angle, and the gas-liquid mixture can enter the transmission cavity and the secondary compression cavity more completely by combining the first inclination angle, so that the diversion and the lubrication of parts of the gas-liquid mixture are realized, and the oil gas can be effectively prevented from being accumulated in the upper cavity to damage the whole compressor.

In the preferred embodiment of the present application, the first inclination angle and the second inclination angle are provided on the partition plate at the same time, but alternatively, the same effect of improving the in-cylinder oil fluidity is obtained.

As shown in fig. 3, the cylinder interstage diaphragm 3 of the present application is provided with a first chamfer 3.3 on the end surface close to the end a4 of the transmission chamber, and the first chamfer 3.3 extends downwards from the upper surface of the cylinder interstage diaphragm to the end surface in an arc shape, i.e. the arc shape is convex upwards; namely, an arc-shaped chamfer structure is arranged at the position, located at the tail end of the gas-liquid mixture flowing to the transmission chamber, of the cylinder interstage baffle 3, and the chamfer structure extends downwards from the upper surface of the cylinder interstage baffle to the end surface in an arc shape, so that the gas-liquid mixture flowing to the position can conveniently and smoothly enter the transmission chamber, particularly, oil cannot be retained and accumulated on the baffle any more, and even in the vibration state of a motor, the backflow phenomenon cannot easily occur.

As shown in fig. 1-3, a second chamfer 3.4 is provided at the joint of the cylinder interstage diaphragm 3 and the inner wall of the cylinder body a, and the second chamfer 3.4 extends downwards in an arc shape from the inner wall of the cylinder body a to the upper surface of the cylinder interstage diaphragm 3; an arc-shaped chamfer structure is formed at the joint of the cylinder interstage clapboard and the inner wall of the cylinder body, the arc is opposite to the arc projection direction of the first chamfer, the arc of the chamfer projects downwards, the arc-shaped chamfer structure can ensure that gas-liquid mixtures are converged towards the middle of the clapboard along the second inclination angle, then the gas-liquid mixtures smoothly and completely enter the transmission chamber along the inclination direction of the first inclination angle, and the oil backflow phenomenon is not easy to occur even under the vibration state of the motor.

In the preferred embodiment of the present application, the first chamfer and the second chamfer are provided on the partition plate at the same time, but alternatively, the first chamfer and the second chamfer can also have the effect of improving the oil fluidity in the cylinder.

As shown in fig. 2-3, the spindle bearing mounting hole 4 is disposed on an end surface of the cylinder interstage diaphragm 3 close to the transmission chamber a4, and the spindle bearing mounting hole 4 is divided into an upper half spindle bearing mounting hole 4.1 and a lower half spindle bearing mounting hole 4.2 by the cylinder interstage diaphragm, the spindle bearing mounting hole 4 is a mounting hole formed by an axial through hole 2, the inner diameter of the axial through hole 2 is greater than the thickness of the cylinder interstage diaphragm 3, wherein the upper half spindle bearing mounting hole 4.1 is greater than the lower half spindle bearing mounting hole 4.2; by adopting the structure, because the cylinder with the specific structure does not need to spray oil independently in each chamber, but oil is sprayed in the primary cavity by means of a specific structure to realize the common lubrication of all the cavities, the axial through hole of the bearing mounting hole is arranged, and the inner diameter of the axial through hole is larger than the thickness of the partition plate, so that a pore for oil-gas mixture to pass through is formed between the partition plate and the bearing mounting hole, thereby ensuring that the oil-gas mixture completely enters the transmission chamber from the mounting hole of the upper half main shaft bearing in a large flow, then the transmission chamber gets into second grade rotor portion through the extrusion of transmission structure after getting rid of oil, mixing through half main shaft bearing mounting hole again, realizes that the large-traffic complete flow that is C type orbit of oil-gas mixture prevents it from long-pending oil on the baffle to can also effectual improvement to the lubrication action of transmission structure in the transmission chamber.

As shown in fig. 1 and 3, a cylinder interstage diaphragm 3 extends from an outer side wall of a main shaft bearing mounting hole 4, and an inner end surface of the main shaft bearing mounting hole (i.e., as shown in fig. 3, the inner end surface of the main shaft bearing mounting hole is a left side end surface) is connected with the cylinder interstage diaphragm; by adopting the structure, the extension structure of the partition board at the position of the main shaft bearing mounting hole is limited, the extension length of the partition board at the position of the outer side wall of the main shaft bearing mounting hole is larger than that of the partition board at the inner end surface of the main shaft bearing mounting hole, namely the partition board is extended at the position of the outer side of the main shaft bearing mounting hole and is mutually overlapped with the outer side wall of the main shaft bearing mounting hole, the inner end surface of the main shaft bearing mounting hole is not extended and is directly stopped at the inner end surface position to provide enough space for mounting the main shaft and the gear, meanwhile, the extension length of the outer side can guide the oil-gas mixture from the exhaust end of the first-stage compression chamber to the transmission chamber to lubricate the transmission parts firstly, and then into the intake end position of the secondary compression chamber, thus preventing the partition plate from being too short and causing a small or insufficient amount of air-fuel mixture to enter the transmission chamber and cause insufficient lubrication.

As shown in the attached drawings 1-2, reinforcing ribs 5 are arranged on the cylinder interstage clapboard 3, the side walls of the main shaft bearing mounting hole 4 and the secondary inlet end bearing mounting hole 6; as can be seen from fig. 1-2, the reinforcing ribs 5 of the present application are provided with a plurality of ribs, for example, the ribs are provided between the upper and lower surfaces of the partition, between the side walls of the main shaft bearing mounting hole 4 and the secondary inlet end bearing mounting hole 6, between the lower surface of the cylinder interstage partition 3 and the side wall of the secondary inlet end bearing mounting hole 6, between the left and right sides and the lower side of the side wall of the secondary inlet end bearing mounting hole 6 and the cylinder body, and the reinforcing ribs are connected with each other through different parts to realize a network-like structure, so as to effectively support the gears on the main shaft bearing and the secondary inlet end bearing, ensure that the kneading between each other is stable and the operation is stable; therefore, the arrangement of the reinforcing rib structure has the effect of a reinforcing structure, and meanwhile, the circulation of oil gas can be ensured, so that the bearing and the gear are effectively lubricated, and stable support is provided for the operation of the gear.

As shown in fig. 5, which is a cross-sectional view corresponding to the first-stage compression chamber of the present application, the figure shows that a detachable first-stage exhaust seat 7 is installed on the first-stage exhaust seat installation site 1 of the cylinder with the structure of fig. 1, and an installation hole site is arranged on the first-stage exhaust seat installation site 1, and the installation hole site is used for realizing the connection and assembly of the first-stage exhaust seat 7 and the first-stage exhaust seat installation site 1 through bolts and other structures.

In addition, the inner wall that is close to axial through-hole on the lateral wall of main shaft bearing mounting hole 4 described in this application is provided with the counter bore of the little spring installation that realizes the pretension bearing effect, assembles little spring in the counter bore in the process of assembling main shaft bearing, for the conventional art in this field, need not be repeated here.

Example 2

As shown in fig. 4 and 6, the cylinder structure of the embodiment of the present application is substantially the same as that described in embodiment 1, except that the primary exhaust seat mounting location 1 of the present embodiment is provided with a primary exhaust seat 7, and the primary exhaust seat 7 is integrally formed with the cylinder body a; the first-stage exhaust seat 7 and the cylinder body a are arranged into an integrally formed structure, namely the cylinder and the first-stage exhaust seat are integrally formed structures, the cylinder and the first-stage exhaust seat are not independent parts and do not need to be connected with each other, but can be integrally cast by adopting processes such as casting and the like to form an integral structure, because if the first-stage exhaust seat is arranged on the cylinder through a screw and a positioning pin, because the processing (concentricity, verticality and position degree) and the assembly requirements of a rotor mounting hole are particularly high, if the processing requirements are not met, the rotor arranged on the cylinder is slightly dislocated, the energy efficiency of a machine is influenced, and even accidents such as cylinder scraping and the like can be seriously caused; in addition, because the first-stage exhaust seat needs to be installed inside the cylinder, the forced oil supply structure of the first-stage exhaust end bearing needs to be designed relatively complexly, and the structure which integrates the first-stage exhaust seat and the cylinder body can effectively avoid the defects.

As shown in fig. 1 and 4, the primary compression chamber is located at the upper part of the cylinder body, the secondary compression chamber is located at the lower part of the cylinder body, the transmission chamber is located at the exhaust end of the primary compression chamber, the interstage accommodation chamber is located between the primary compression chamber and the secondary compression chamber and extends to be communicated with the transmission chamber along the axial direction of the primary compression chamber and the secondary compression chamber (the interstage accommodation chamber of the present application can be considered to contain the transmission chamber, and the transmission chamber is a part of the interstage accommodation chamber), and the primary exhaust seat installation position, the intake end of the secondary compression chamber and the transmission chamber are all located at the same end of the interstage accommodation chamber; the transmission ends of the transmission cavity, the first-stage compression cavity and the interstage containing cavity are connected with each other through the bearing, the gear and the shaft, other positions are in a direct open type communication mode, a sealing plate for isolation between the transmission cavity and other cavities is not arranged, the problem of oil-gas overstocking and the problem of complex structure caused by arrangement of an oil return structure can be solved, and oil-gas mixture is guaranteed to circulate according to a C-shaped circulation track; by adopting the structure, the communication among the first-stage compression chamber, the second-stage compression chamber, the transmission chamber and the interstage accommodating cavity is realized, and the first-stage exhaust end and the second-stage air inlet end are arranged on the same side and are all arranged in the space of the interstage accommodating cavity; the partition plate is of a specific structure, two inclination angles are mainly formed in the partition plate, and a chamfer processing structure is arranged on the partition plate, so that an oil-gas mixture coming out of a first-stage exhaust end in the partition plate can be effectively guided to enter a transmission chamber and then enter a second-stage air inlet end, the oil-gas circulation track is shortened, the oil circuit is simplified, multi-stage lubrication can be effectively realized, and the arrangement of an oil return structure is cancelled; the interstage containment chamber of the present application may comprise a transmission chamber, which may also be referred to collectively as the interstage/transmission chamber.

Claims

1. A two-stage screw compressor cylinder is characterized in that: the structure comprises a cylinder body (a), wherein a primary compression chamber (a1), a secondary compression chamber (a2), an interstage accommodating cavity (a3) and a transmission chamber (a4) are arranged in the cylinder body (a); the same direction ends of the first-stage compression chamber (a1), the second-stage compression chamber (a2) and the interstage accommodating cavity (a3) are communicated with a transmission chamber (a4), and a cylinder interstage partition plate (3) is arranged in the interstage accommodating cavity (a 3); the cylinder interstage diaphragm (3) is provided with a main shaft bearing mounting hole (4) close to the end of the transmission chamber (a4), and the second stage compression chamber (a2) is provided with a second stage inlet end bearing mounting hole (6) close to the end of the transmission chamber (a 4).

2. The dual stage screw compressor cylinder of claim 1, wherein: the cylinder interstage diaphragm (3) is provided with a first inclination angle (3.1), and the first inclination angle (3.1) is formed by gradually inclining downwards from the end far away from the transmission chamber (a4) to the end close to the transmission chamber (a 4).

3. The dual stage screw compressor cylinder of claim 1, wherein: the cylinder interstage clapboard (3) is provided with a second inclination angle (3.2), and the second inclination angle (3.2) is formed by gradually inclining downwards from two sides to the middle of the clapboard in the width direction.

4. The dual stage screw compressor cylinder of claim 1, wherein: the cylinder interstage diaphragm (3) is provided with a first chamfer (3.3) on the end face close to the end of the transmission chamber (a4), and the first chamfer (3.3) extends downwards from the upper surface of the cylinder interstage diaphragm to the end face in an arc shape.

5. The dual stage screw compressor cylinder of claim 1, wherein: and a second chamfer (3.4) is arranged at the joint of the cylinder interstage diaphragm (3) and the inner wall of the cylinder body (a), and the second chamfer (3.4) extends downwards from the inner wall of the cylinder body (a) to the upper surface of the cylinder interstage diaphragm (3) in an arc shape.

6. The dual stage screw compressor cylinder of claim 1, wherein: the main shaft bearing mounting hole (4) is formed in the end face, close to the transmission chamber, of the cylinder interstage diaphragm (3), and the main shaft bearing mounting hole (4) is divided into an upper half main shaft bearing mounting hole (4.1) and a lower half main shaft bearing mounting hole (4.2) by the cylinder interstage diaphragm (3).

7. The dual stage screw compressor cylinder of claim 6, wherein: the main shaft bearing mounting hole (4) is a mounting hole formed by an axial through hole (2), and the inner diameter of the axial through hole (2) is larger than the thickness of the cylinder-level spacing plate; the upper half main shaft bearing mounting hole (4.1) is larger than the lower half main shaft bearing mounting hole (4.2).

8. The dual stage screw compressor cylinder of claim 6, wherein: the outer side wall of the main shaft bearing mounting hole (4) is extended with a cylinder interstage clapboard (3), and the inner end face of the main shaft bearing mounting hole (4) is connected with the cylinder interstage clapboard (3).

9. The dual stage screw compressor cylinder of claim 1, wherein: and reinforcing ribs (5) are arranged on the cylinder interstage clapboard (3) and on the side walls of the main shaft bearing mounting hole (4) and the secondary inlet end bearing mounting hole (6).

10. The dual stage screw compressor cylinder of claim 1, wherein: the cylinder is characterized in that a first-stage exhaust seat (7) is arranged on the first-stage exhaust seat mounting position (1), and the first-stage exhaust seat (7) and the cylinder body (a) are integrally formed.

11. The dual stage screw compressor cylinder of any one of claims 1 to 10, wherein: the cylinder comprises a cylinder body (a), a first-stage compression chamber (a1), a second-stage compression chamber (a2), a transmission chamber (a3), an interstage accommodation chamber (a3), a first-stage compression chamber (a1) and a second-stage compression chamber (a2), wherein the first-stage compression chamber (a1) is located at the upper part of the cylinder body (a), the second-stage compression chamber (a2) is located at the lower part of the cylinder body (a), the transmission chamber (a3) is located at the exhaust end of the first-stage compression chamber (a1), the interstage accommodation chamber (a3) is located between the first-stage compression chamber (a1) and the second-stage compression chamber (a2) and extends to be communicated with the transmission chamber (a4) along the axial directions of the first-stage compression chamber (a1) and the second-stage compression chamber (a2), and the first-stage exhaust seat installation position (1), the air inlet end of the second-stage compression chamber (a2) and the transmission chamber (a4) are located at the same end of the interstage accommodation chamber (a 3).