CN116480580A - A method of adjusting the gap between the rotor and the end face of screw compressors by using limit tooling - Google Patents

Abstract

The invention relates to the technical field of screw compressors, in particular to a method for adjusting the gap between a rotor and an end face of a screw compressor by using a limiting tool. According to the method, the limit tool is adopted for installation, and the screw compressor is fixed on the limit tool, so that the screw compressor cannot be offset and rotated when being installed, and the precision of the compressor is affected; the compressor comprises a rotor, an exhaust seat cover plate and a stop lever fixedly connected below the male rotor, wherein when the size of a lock nut and a gap are required to be adjusted, the stop lever on the male rotor can be abutted against a fixed table, so that the male rotor is limited to rotate. By using the limiting tool and the adjusting method, gaps among the female rotor, the male rotor and the exhaust seat are adjusted when the lock nut is installed, the size range of the gaps is 0.03mm-0.17mm, and friction between the female rotor and the male rotor and the exhaust seat can be prevented by setting the accurate gaps, so that the integral exhaust pressure can not be influenced.

Description

A method of adjusting the gap between the rotor and the end face of screw compressors by using limit tooling

technical field

The invention relates to the technical field of screw compressors, in particular to a method for adjusting the gap between a rotor and an end surface of a screw compressor by using a position-limiting tool.

Background technique

The screw compressor consists of a pair of parallel, intermeshing female and male screws, and is the most widely used type of rotary compressor. Divided into two kinds of single-screw and twin-screw, usually said screw compressor refers to the twin-screw compressor. There are two kinds of screw compressors: dry type and wet type. The so-called dry type means that no liquid is sprayed in the working chamber, and the compressed gas will not be polluted. The wet type means that lubricating oil or other liquids are sprayed into the working chamber to cool the compressed gas and improve the seal. It can also lubricate the male and female rotors and bearings to achieve self-transmission, and then remove oil or other liquid impurities in the compressed air through a high-precision filter to obtain high-quality compressed gas.

Since the work of the screw is completed by the three parts of suction-compression-exhaust, axial force will be generated during this period, and the high-speed rotor always acts on the axial force from the high-pressure end to the low-pressure end. Under the action of the axial force, the rotor produces axial displacement to the low-pressure end. The axial displacement of the rotor at high speed will cause relative sliding between the journal and the thrust bearing. Since the top surface of the thread of the female rotor and the male rotor is close to the bottom of the exhaust seat, when the compressor is running, the female rotor and the male rotor will rub against the exhaust seat, which will easily damage the compressor, and the distance between the two will affect the exhaust pressure, so it is necessary to adjust the distance between the two.

Contents of the invention

In order to solve the above-mentioned technical problems, the object of the present invention is to provide a method for adjusting the gap between the rotor and the end face of a screw compressor with a limit tool. This method adjusts the gap between the female rotor, the male rotor and the exhaust seat when the pressure plate is installed. By setting this precise gap, the female rotor and the male rotor can be prevented from rubbing against the exhaust seat, and the overall exhaust pressure will not be affected.

In order to achieve the above object, the present invention adopts the following technical solutions:

A method for adjusting the gap between the rotor and the end face of a screw compressor with a limit tool, the compressor includes a male rotor, a female rotor, an exhaust seat, a lock nut and a cover plate, a first rotor hole and a second rotor hole are arranged on the bottom end of the exhaust seat, bearing installation ports are respectively provided at the upper ends of the first rotor hole and the second rotor hole, and the cover plate is fixedly connected to the top of the exhaust seat; the method is characterized in that the method uses a limit tool for installation, and the limit tool includes a fixed platform and a fixed component, and the left end of the fixed component is horizontally connected to the right side of the fixed platform ; The method includes the following steps:

S1. Insert the thread of the female rotor into the thread gap of the male rotor, insert the male rotor and the female rotor into the first rotor hole and the second rotor hole respectively, install the bearing group and the lock nut in turn on the upper ends of the male rotor and the female rotor in the bearing installation port;

S2. Set the male rotor and the female rotor perpendicular to the ground, and set several spacers of the same height on the bottom of the exhaust seat;

S3. A radial through hole is provided at the lower end of the male rotor, a stop rod is inserted in the through hole, and the stop rod is fixedly connected to the male rotor by bolts;

S4. Horizontally arrange the exhaust seat on the right end of the fixed assembly;

S5. Attach the plane B of the female rotor and the plane C of the male rotor to the bottom surface of the exhaust seat with a little gap, and tighten the lock nut. The stop rod on the male rotor will abut against the fixed platform and restrict the rotation of the male rotor. The plane B is the top of the threaded part of the female rotor, and the plane C is the top of the threaded part of the male rotor;

S6. Use a feeler gauge to measure the actual gap between the plane D of the female rotor and the plane G of the male rotor and the bottom of the exhaust seat, and obtain the deviation between the gap and the predetermined value;

S7. When the actual gap is greater than the predetermined value, slightly loosen the lock nut and push the male rotor and the female rotor toward the direction of the exhaust seat, so that the gap between the plane B of the female rotor and the plane C of the male rotor and the bottom of the exhaust seat reaches the predetermined value; when the actual gap is smaller than the predetermined value, slightly loosen the lock nut and hit the top surface of the female rotor and the top surface of the male rotor, so that the gap between the plane B of the female rotor, the plane C of the male rotor and the bottom end of the exhaust seat reaches the predetermined value;

S8. Fix the cover plate to the top of the exhaust seat;

S9. Remove the stop rod from the male rotor, and remove the compressor from the limit tooling.

Preferably, the bearing set adopts a tapered roller bearing set.

Preferably, the fixed assembly includes a round table, a roller, a baffle plate and an adapter flange block; the round table is fixedly connected to the right side of the fixed table by bolts, the middle part of the round table is provided with a transverse through groove, the roller shaft is passed through the through groove and its left end extends out of the fixed table, the baffle plate is arranged on the left end of the roller shaft and fixed by bolts, and the adapter flange block is bolted to the right end of the roller shaft.

Preferably, the fixing assembly further includes retaining rings, and there are two sets of retaining rings, one set of retaining rings is arranged on the outer diameter of the left end of the roller, and its two ends are respectively abutted against the baffle plate and the fixed platform; the other set of retaining rings is arranged on the outer diameter of the right end of the roller, and its two ends are respectively abutted against the round platform and the transfer flange block.

Preferably, several sets of positioning grooves are provided on the transfer flange block, and the positioning grooves are arranged on the diagonal of the transfer flange block.

Preferably, adjustable bolts for fixing the rollers are arranged on the outer ring surface of the circular platform.

Preferably, the fixed platform is provided with a triangular steel plate for reinforcement.

Preferably, in step S1, the tapered roller bearing set is installed on the upper ends of the male rotor and the female rotor by heating.

Preferably, the size range of the gap is 0.03mm-0.17mm.

In summary, the advantages of the present invention are:

By using the limiting tooling and adjustment method, the gap between the female rotor, the male rotor and the exhaust seat is adjusted when the lock nut is installed. The size range of the gap is 0.03mm-0.17mm. By setting this precise gap, the female rotor and the male rotor can be prevented from rubbing against the exhaust seat, and the overall exhaust pressure will not be affected.

Description of drawings

Fig. 1 is a structural schematic diagram of the combination of screw compressor and limit tooling;

Fig. 2 is a structural schematic diagram 1 of the limit tooling;

Fig. 3 is the structural schematic diagram II of the limit tooling;

Fig. 4 is a schematic sectional view of the limit tooling;

Fig. 5 is a schematic sectional view of a screw compressor;

Fig. 6 is the structural representation of circular platform;

Fig. 7 is the structural representation of roller;

Reference signs: 1, male rotor; 2, female rotor; 3, exhaust seat; 5, lock nut; 6, tapered roller bearing group; 7, stop rod; 8, fixed platform; Adjust the bolt.

Detailed ways

The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 7, there is a method for adjusting the gap between the rotor and the end surface of a screw compressor with a limit tool. The compressor includes a male rotor 1, a female rotor 2, an exhaust seat 3 and a lock nut 5. The bottom end of the exhaust seat 3 is provided with a first rotor hole 31 and a second rotor hole 32. The upper ends of the first rotor hole 31 and the second rotor hole 32 are respectively provided with bearing installation ports; the method uses a limit tool for installation. The limit tool includes a fixed table 8 and a fixed assembly 9. On the right side of the platform 8; wherein the fixed platform 8 is welded by three steel plates, and a triangular steel plate 81 is set at the opposite corner welded at the two ends of the fixed platform 8 to reinforce the fixed platform 8 and ensure its stability.

As shown in Figures 2 and 4, the fixed assembly 9 includes a round table 91, a roller 92, a baffle plate 93 and an adapter flange block 94, and the round table 91 is fixed on the right side of the fixed table 8 by several bolts, and is locked by a nut on the inside of the fixed table 8; The baffle plate 93 is arranged on the left end of the roller 92 and is fixed by bolts. A stop ring 95 is set between the baffle plate 93 and the fixed table 8, and the stop ring 95 is set on the outer diameter of the left end of the roller shaft 92. By increasing the stop ring 95, the baffle plate 93 will not be closely attached to the fixed table 8, effectively reducing the friction between the two. The adapter flange block 94 is fixedly connected on the right end of the roller shaft 92 by bolts, wherein the bolts here are completely submerged in the adapter flange block 94;

As shown in Figure 2, four sets of positioning grooves 96 are provided on the diagonal of the adapter flange block 94, and bolt groups are arranged in the four sets of positioning grooves 96. When the exhaust seat 3 is not installed, the bolt groups can slide in the positioning grooves 96, so that different types of exhaust seat 3 can be adapted. Since the left end of the exhaust seat 3 is provided with a threaded hole, when fixing the exhaust seat 3, first insert the bolt into the threaded hole. At this time, one end of the bolt is inserted into the bearing installation port, and at this time, it is locked by a nut, and the nut here is arranged inside the exhaust seat 3 to ensure that it will not affect the installation of the tapered roller bearing group 6.

As shown in Figure 1, when the exhaust seat 3 is horizontally arranged on the fixed assembly 9, the roller 92 and the round table 91 are connected to each other by using the adjustable bolt 97, so that the roller 92 will not rotate any more, so that the exhaust seat 3 is always in a horizontal state.

When installing the whole screw rod, the female rotor 2, the male rotor 1 and the exhaust seat 3 are all arranged vertically downward. Since the shape of the male rotor 1 is larger than that of the female rotor 2, that is, the hole diameter of the first rotor hole 31 is larger than the hole diameter of the second rotor hole 32, it is convenient to insert the male rotor 1 into the first rotor hole 31 and insert the female rotor 2 into the second rotor hole 32, and the thread of the male rotor 1 is engaged with the thread of the female rotor 2.

As shown in FIG. 2 , FIG. 3 and FIG. 6 , two tapered roller bearing groups 6 stacked one above the other form a tapered roller bearing group 6 . When the female rotor 2 and the male rotor 1 are plugged in the exhaust seat 3, the tapered roller bearing group 6 is first heated, and after the heating is completed, it is installed on the top shaft ends of the male rotor 1 and the female rotor 2. Among them, the tapered roller bearing set 6 arranged on the top of the male rotor 1 has its cone tip facing the male rotor 1; The inner tapered rollers of the tapered roller bearing set 6 are arranged obliquely. This design can effectively reduce the axial force in two directions and better protect the bearing.

As shown in Figures 1 and 5, after the tapered roller bearing set 6 is sleeved on the top ends of the female rotor 2 and the male rotor 1, the lock nut 5 is fixedly connected to the top ends of the female rotor 2 and the male rotor 1 and abuts against the tapered roller bearing set 6. At this time, the plane D of the female rotor 2 and the plane G of the male rotor 1 are attached to the bottom surface of the exhaust seat 3, since there is no gap 33 here, the exhaust pressure will be directly affected. First, the actual gap 33 between the plane D of the yin rotor 2 and the plane G of the yang rotor 1. The actual gap between the bottom surface of the exhaust seat 3 is 33. When the plane D of the phenotrans 2 and the plane G of the yang rotor 1 and the base of the exhaust seat 3 are 33 hours. Axial movement occurs in the external force. The plane D of the phenomenon rotor 2 and the plane G of the yang rotor 1 and the exhaust seat 3 bottom surface 33 amplify, so that the plane G of the phenotrans 2 and the plane G of the yang rotor 1 and the gap between the exhaust seat 33 reaches the scheduled value; When the gap 33 is too large, by pushing up the yang rotor 1 and the phenomenon 2, the plane D and the plane G of the yin rotor 2 and the yang rotor 1. The gap between the bottom 33 of the exhaust seat 33 reaches the scheduled value;

Since a radial through hole is provided at the lower end of the male rotor 1, a stop rod 7 is inserted in the through hole, and then the stop rod 7 is fixedly connected to the male rotor 1 by bolts. By setting the stop rod 7 and adjusting the size of the lock nut 5 and the gap 33, the stop rod 7 on the male rotor 1 will abut against the fixed platform 8 and restrict the rotation of the male rotor 1.

As shown in Figure 5, two or more spacers 10 with the same height are arranged on the bottom of the exhaust seat 3, which can facilitate the measurement of the actual gap 33 with a feeler gauge and then adjust the gap 33; it can also play a supporting role during installation.

As shown in FIG. 1 , the cover plate is fixedly connected to the top of the exhaust seat 3 by bolts to prevent its internal components from detaching from the exhaust seat 3 during the movement of the device and ensure overall stability.

The adjustment method is as follows:

S1. Insert the thread of the female rotor 2 into the thread gap of the male rotor 1, insert the male rotor 1 and the female rotor 2 into the first rotor hole 31 and the second rotor hole 32 respectively, install the bearing group and the lock nut 5 in sequence on the upper ends of the male rotor 1 and the female rotor 2 in the bearing installation opening;

S2. Set the male rotor 1 and the female rotor 2 perpendicular to the ground, and set several spacers 10 of the same height on the bottom of the exhaust seat 3;

S3. A radial through hole is provided at the lower end of the male rotor 1, a stop rod 7 is inserted in the through hole, and the stop rod 7 is fixedly connected to the male rotor 1 by bolts;

S4. Horizontally arrange the exhaust seat 3 on the right end of the fixing assembly 9;

S5. Attach the plane B of the female rotor 2 and the plane C of the male rotor 1 to the bottom surface of the exhaust seat 3, and set a gap 33, and tighten the lock nut 5, the stop rod 7 on the male rotor 1 will contact the fixed platform 8 and restrict the rotation of the male rotor 1, wherein the plane B is the top of the threaded part of the female rotor 2, and the plane C is the top of the threaded part of the male rotor 1;

S6. Use a feeler gauge to measure the actual gap 33 between the plane D of the female rotor 2 and the plane G of the male rotor 1 and the bottom end of the exhaust seat 3, and obtain the deviation between the gap 33 and the predetermined value;

S7. When the actual gap 33 is greater than the predetermined value, slightly loosen the lock nut 5 and push the male rotor 1 and the female rotor 2 toward the exhaust seat 3, so that the gap 33 between the plane B of the female rotor 2 and the plane C of the male rotor 1 and the bottom end of the exhaust seat 3 reaches the predetermined value; predetermined value;

S8, the cover plate is fixedly connected to the top of the exhaust seat 3;

S9. Remove the stop rod 7 from the male rotor 1, and remove the compressor from the position-limiting tooling.

The foregoing is a description of the embodiments of the present invention, and through the above descriptions of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these examples will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel points disclosed herein.

Claims (9)

1. The method for adjusting the gap between the rotor and the end face of the screw compressor by using a limiting tool comprises a male rotor (1), a female rotor (2), an exhaust seat (3), a locking nut (5) and a cover plate, wherein a first rotor hole (31) and a second rotor hole (32) are formed in the bottom end of the exhaust seat (3), bearing mounting openings are respectively formed in the upper ends of the first rotor hole (31) and the second rotor hole (32), and the cover plate is fixedly connected to the top of the exhaust seat (3); the method is characterized in that a limiting tool is adopted for installation, the limiting tool comprises a fixed table (8) and a fixed assembly (9), and the left end of the fixed assembly (9) is horizontally connected to the right side of the fixed table (8); the method comprises the following steps:

s1, inserting threads of a female rotor (2) into a thread gap of a male rotor (1), inserting the male rotor (1) and the female rotor (2) into a first rotor hole (31) and a second rotor hole (32) respectively, and sequentially installing a bearing group and a locking nut (5) at the upper ends of the male rotor (1) and the female rotor (2) in a bearing installation port;

s2, arranging the male rotor (1) and the female rotor (2) perpendicular to the ground, and arranging a plurality of cushion blocks (10) with the same height on the bottom of the exhaust seat (3);

s3, arranging a radial through hole at the lower end part of the male rotor (1), inserting a stop lever (7) into the through hole, and fixedly connecting the stop lever (7) on the male rotor (1) through a bolt;

s4, horizontally arranging the exhaust seat (3) on the right end of the fixed assembly (9);

s5, sticking a plane B of the female rotor (2) and a plane C of the male rotor (1) to the bottom surface of the exhaust seat (3), forming a gap (33), screwing the lock nut (5), and enabling a stop lever (7) on the male rotor (1) to abut against the fixed table (8) and limit the male rotor (1) to rotate, wherein the plane B is the top end of a threaded part of the female rotor (2), and the plane C is the top end of the threaded part of the male rotor (1);

s6, measuring an actual gap (33) between a plane D of the female rotor (2) and a plane G of the male rotor (1) and the bottom end of the exhaust seat (3) by using a clearance gauge to obtain deviation between the gap (33) and a preset value;

s7, when the actual gap (33) is larger than a preset value, slightly loosening the lock nut (5) and pushing the male rotor (1) and the female rotor (2) towards the exhaust seat (3), so that the gap (33) between the plane B of the female rotor (2) and the plane C of the male rotor (1) and the bottom end of the exhaust seat (3) reaches the preset value; when the actual gap (33) is smaller than a preset value, the lock nut (5) is loosened slightly and knocked on the top surface of the female rotor (2) and the top surface of the male rotor (1), so that the gap (33) between the plane B of the female rotor (2) and the plane C of the male rotor (1) and the bottom end of the exhaust seat (3) reaches the preset value;

s8, fixedly connecting a cover plate to the top end of the exhaust seat (3);

s9, the stop lever (7) is detached from the male rotor (1), and the compressor is detached from the limiting tool.

2. Method according to claim 1, characterized in that the bearing set is a tapered roller bearing set (6).

3. The method according to claim 1, characterized in that the fixing assembly (9) comprises a circular table (91), a roller (92), a baffle (93) and an adapter flange block (94); the round table (91) is fixedly connected to the right side of the fixed table (8) through bolts, a transverse through groove is formed in the middle of the round table (91), the rolling shaft (92) is arranged in the through groove in a penetrating mode, the left end of the rolling shaft extends out of the fixed table (8), the baffle (93) is arranged at the left end of the rolling shaft (92) and is fixed through bolts, and the adapter flange block (94) is connected to the right end of the rolling shaft (92) through bolts.

4. A method according to claim 3, characterized in that the fixed assembly (9) further comprises a stop ring (95), the stop ring (95) being provided with two sets, wherein one set of stop rings (95) is arranged on the outer diameter of the left end of the roller (92) and the two ends thereof are respectively abutted against the stop plate (93) and the fixed table (8); the other group of baffle rings (95) are arranged on the outer diameter of the right end of the roller (92), and two ends of the baffle rings are respectively abutted against the round table (91) and the adapter flange block (94).

5. A method according to claim 3 or 4, characterized in that the adapter flange block (94) is provided with several sets of positioning slots (96), which positioning slots (96) are arranged on the diagonal of the adapter flange block (94).

6. A method according to claim 3, characterized in that the outer ring surface of the circular table (91) is provided with adjustable bolts (97) for fixing the roller (92).

7. Method according to claim 1, characterized in that the fixed table (8) is provided with a triangular steel plate (81) for reinforcement.

8. Method according to claim 2, characterized in that the tapered roller bearing group (6) is mounted on the upper end of the male rotor (1), female rotor (2) in step S1 by heating.

9. A method according to claim 1, characterized in that the size of the gap (33) is in the range of 0.03mm-0.17mm.