Screw air compressor

Abstract

The invention relates to the technical field of compressor equipment, and discloses a screw air compressor which comprises a shell and an exhaust end seat, a rotor set is installed in the shell, the shell and the exhaust end seat are fixed together through bolts, and a rotor shaft of the rotor set penetrates through the exhaust end seat and is connected with a supporting bearing and a positioning bearing. The end part of the exhaust end seat is fixedly connected with a gland, an adjustable cushion cover is arranged between the positioning bearing and the supporting bearing, the adjustable cushion cover comprises a positioning sleeve, one end of the positioning sleeve is movably sleeved with a telescopic head, and the other end of the positioning sleeve is in threaded connection with an adjusting pipe. The thickness of the adjustable cushion cover can be conveniently adjusted, the thickness of the adjustable cushion cover can exactly enable the exhaust gap to be within the optimal range, meanwhile, the gap between the locking pin and the positioning ring is within the proper range, when the radial internal clearance of the rotor set is enlarged, an observation groove in the positioning ring is easily worn through, lubricating oil in the exhaust end seat can partially flow out, and the exhaust effect is improved. And direct observation by external maintenance personnel is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of compressor equipment, and in particular to a screw air compressor. Background Art

[0002] Twin-screw compressors are widely used in industries such as refrigeration, air compression, and petrochemicals due to their high reliability, high efficiency, ease of operation, adaptability, and low maintenance costs under medium and low pressure conditions. As the core component of a twin-screw compressor, the exhaust clearance of the rotor directly affects the compressor's overall performance.

[0003] The discharge clearance is the distance between the rotor end face and the exhaust end seat after the compressor is assembled. Its size is affected by the spacer between the rotor exhaust end support bearing and the locating bearing. Due to manufacturing errors, the thickness of the spacer required for each screw compressor varies. Therefore, during assembly, it may be necessary to disassemble and reassemble the compressor multiple times to find the right spacer thickness.

[0004] Secondly, after the screw compressor has been used for a long time, the radial clearance of the bearing becomes larger and the rotor will frequently rub against the casing. When the operating noise increases significantly and the gas heat increases significantly, the screw compressor may suffer irreparable damage. Summary of the Invention

[0005] The present application proposes a screw air compressor, wherein the thickness of an adjustable gasket can be adjusted, and the adjustment method is simple, which facilitates the assembly of the compressor and ensures that the exhaust gap is within an optimal range.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a screw air compressor, comprising a shell and an exhaust end seat, a rotor group being installed in the shell, the shell and the exhaust end seat being fixed together by bolts, the rotor shaft of the rotor group passing through the exhaust end seat and being connected to a support bearing and a locating bearing, the end of the exhaust end seat being fixedly connected to a pressure cover, an adjustable sleeve being provided between the locating bearing and the support bearing, the adjustable sleeve comprising a locating sleeve, one end of the locating sleeve being movably sleeved with a telescopic head, the other end being threadedly connected with an adjustment tube, the locating sleeve being connected with a locking piece, the locking piece being capable of locking the relative position of the locating sleeve and the telescopic head, the depth to which the adjustment tube is screwed into the locating sleeve being within the exhaust gap range.

[0007] Furthermore, the locking member includes a locking pin, which passes through the side wall of the positioning sleeve and can be close to the telescopic head. The positioning sleeve is movably connected to the locking pin. When the locking pin is close to the telescopic head, the relative positions of the positioning sleeve and the telescopic head are locked.

[0008] Furthermore, a positioning groove is provided at the bottom of the adjustment tube, and a protrusion corresponding to the positioning groove is provided on the inner ring of the support bearing. The locking member also includes a positioning ring, which can be fixedly connected to the exhaust end seat. The locking pin passes through the positioning ring, and the telescopic head is provided with a groove relative to the position of the locking pin. The side of the pressure block on the locking pin is elastic. When it enters the groove, its side presses the side of the groove. Only when the locking pin contacts the bottom of the groove, the locking pin is completely moved out of the positioning ring. The locking pin can be screwed in in two stages.

[0009] Furthermore, the positioning ring is fixed to the exhaust end seat by a fastening screw. The exhaust end seat has a fastening groove for installing the fastening screw and an operating hole for tightening the locking pin corresponding to the position of the positioning ring. The fastening groove is an axial waist hole. When the positioning ring is fixed, the operating hole is aligned with the locking pin.

[0010] Furthermore, the fastening screw is hollow, and an observation groove is provided in the middle of the positioning ring. The inner wall of the observation groove is composed of a sealing plate made of a low-hardness, easily-worn material. One end of the fastening screw is inserted into the observation groove and connected to the observation groove. The fastening screw is connected to an observation tube, and the observation groove corresponds to the axial position of the locking pin.

[0011] Furthermore, the inner wall of the positioning ring is a frustum, and the diameter becomes larger the closer to the support bearing. The end of the locking pin is provided with a grinding head to reduce the length requirement for the locking pin to be screwed into the positioning sleeve.

[0012] Furthermore, the locking pins and fastening screws are provided in two groups, and the two groups of locking pins and fastening screws are symmetrical up and down, so that the centers of the two locking pins are on the rotor shaft, and the center of the fastening screws is on the central axis of the exhaust end seat.

[0013] Furthermore, an elastic sheet is provided at the bottom of the groove. When the locking pins are tightened, the elastic sheet is in close contact with the rotor shaft of the rotor assembly, and the two locking pins can be in close contact with the rotor shaft.

[0014] The beneficial effects of the present invention are as follows:

[0015] The present application provides a screw air compressor, in which one side of the positioning sleeve is threadedly connected to an adjustment tube, and the other side is movably sleeved to a telescopic head. The compressor is assembled when the exhaust gap is zero. At this time, the pressure of the positioning bearing on the telescopic head causes the telescopic head to retract, so that the thickness of the adjustable sleeve is just enough to make the exhaust gap zero. At this time, the positioning sleeve and the telescopic head are locked, and the adjustment tube is rotated again to reduce the thickness of the adjustable sleeve again. At this time, the thickness of the adjustable sleeve is just enough to make the exhaust gap within the optimal range.

[0016] The locating ring can not only lock the locating sleeve circumferentially, making it easy for the adjustment tube to rotate and retract, but also keep the gap between the locking pin and the locating ring within an appropriate range. When the radial clearance of the rotor group becomes larger, the observation groove on the locating ring can be easily worn through, allowing the lubricating oil in the exhaust end seat to partially flow out, making it easier for external maintenance personnel to observe directly, and thus detect problems in the compressor in the early stages, thus preventing the compressor from being worn beyond repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can also derive other drawings based on the provided drawings without inventive work.

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a partial top view of the present invention;

[0020] Figure 3 A bottom view of the present invention;

[0021] Figure 4 For the present invention Figure 3 A magnified view of middle A;

[0022] Figure 5 is a schematic diagram of the adjustable cushion cover of the present invention;

[0023] Figure 6 is a front view of the adjustable cushion cover of the present invention;

[0024] Figure 7 It is a partial cross-sectional view of the exhaust end seat in the present invention.

[0025] In the figure: 1. Shell; 2. Exhaust end seat; 3. Rotor group; 4. Support bearing; 5. Positioning bearing; 6. Adjustable sleeve; 61. Adjustment tube; 62. Positioning sleeve; 63. Telescopic head; 64. Positioning groove; 7. Pressure cover; 8. Locking piece; 81. Locking pin; 82. Positioning ring; 83. Elastic sheet; 84. Operating hole; 85. Fastening screw; 86. Observation slot; 87. Sealing plug; 88. Observation tube; 89. Fastening slot. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] For example 1, please refer to Figures 1-6 A screw air compressor includes a shell 1 and an exhaust end seat 2. A rotor group 3 is installed in the shell 1. The rotor group 3 consists of a male rotor and a female rotor. The male and female rotors are engaged with each other. The shell 1 and the exhaust end seat 2 are fixed together by bolts. The rotor shaft of the rotor group 3 passes through the exhaust end seat 2 and is connected with a support bearing 4 and a locating bearing 5. The exhaust end seat 2 is provided with a concave platform, the support bearing 4 is installed in the concave platform, and the locating bearing 5 is fixedly installed on the rotor shaft. The end of the exhaust end seat 2 is fixedly connected with a pressure cover 7, which presses the locating bearing 5. An adjustable sleeve 6 is provided between the locating bearing 5 and the support bearing 4.

[0028] The adjustable sleeve 6 includes a positioning sleeve 62, one end of the positioning sleeve 62 is movably connected to a telescopic head 63, the other end of the adjustable sleeve 6 is threadedly connected to an adjustment tube 61, the positioning sleeve 62 is connected to a locking piece 8, the locking piece 8 can lock the relative position of the positioning sleeve 62 and the telescopic head 63, fix the length of the adjustable sleeve 6, the depth of the adjustment tube 61 screwed into the positioning sleeve 62 is within the exhaust gap range, preferably the middle value of the exhaust gap, and the exhaust gap includes the axial clearance of the support bearing 4.

[0029] When assembling the compressor, first use a jack to carry the rotor group 3 and position it axially, that is, make the side of the rotor group 3 close to the side of the exhaust end seat 2, install the support bearing 4, adjustable sleeve 6 and positioning bearing 5 in sequence, and make the positioning bearing 5 press the adjustable sleeve 6. The adjustable sleeve 6 shrinks under the pressure of the positioning bearing 5. At this time, the overall thickness of the adjustable sleeve 6 just makes the side of the rotor group 3 close to the side of the exhaust end seat 2. Then make the adjustment tube 61 and the positioning sleeve 62 rotate relative to each other, the overall thickness of the adjustable sleeve 6 is reduced, remove the jack, and install the pressure cover 7. At this time, the exhaust gap just reaches the optimal range.

[0030] Example 2. Example 1 requires that the adjustable sleeve 6 be taken out for a second thickness adjustment, and the positioning bearing 5 and the adjustable sleeve 6 need to be installed twice, which is not very convenient. On the basis of Example 1, the locking member 8 includes a locking pin 81, which passes through the side wall of the positioning sleeve 62 and can be close to the telescopic head 63. The end of the locking pin 81 is provided with a pressure block, which is movably connected to the locking pin 81. The locking pin 81 and the positioning sleeve 62 are threadedly connected. The relative surfaces of the locking pin 81 and the telescopic head 63 are rough or can engage with each other. When the locking pin 81 is pressed against the telescopic head 63, the relative positions of the positioning sleeve 62 and the telescopic head 63 are locked.

[0031] The bottom of the adjustment tube 61 is provided with a positioning groove 64, and the inner ring of the support bearing 4 is provided with a protrusion corresponding to the positioning groove 64. When the adjustment tube 61 is close to the support bearing 4, it can rotate with the inner ring of the support bearing 4. The locking member 8 also includes a positioning ring 82, which can be fixedly connected to the exhaust end seat 2. The locking pin 81 passes through the positioning ring 82. The telescopic head 63 is provided with a groove relative to the position of the locking pin 81. The side of the pressure block on the locking pin 81 is elastic. When it enters the groove, its side presses the side of the groove to achieve preliminary locking. At this time, the locking The pin 81 does not touch the bottom of the groove, and a part of the locking pin 81 is still in the positioning ring 82. The positioning ring 82 is fixed to the exhaust end seat 2 by a fastening screw 85. The exhaust end seat 2 corresponds to the position of the positioning ring 82 and is reserved with a fastening groove 89 for installing the fastening screw 85 and an operating hole 84 for tightening the locking pin 81. When the positioning ring 82 is fixed, the operating hole 84 is aligned with the locking pin 81, and the locking pin 81 can be twisted from the outside to lock the positioning sleeve 62 and the telescopic head 63. For example, they can be blocked by a sealing plug to prevent lubricating oil from flowing out of the mounting hole. In this embodiment, two through holes are provided at the bottom of the operating hole 84, one through hole is a fastening groove 89, the fastening groove 89 is an axial waist hole, and the other is used to align with the locking pin 81. The two through holes are stepped, and the larger position at the top can be screwed into the sealing plug 87. A dust plug is installed on the top of the operating hole 84. When the positioning sleeve 62 and the telescopic head 63 are initially locked by the locking piece 8, the circumference of the positioning sleeve 62 is locked on the positioning ring 82 by the locking pin 81. At this time, the adjustment tube 61 can be rotated by rotating the rotor group 3 to adjust the overall thickness of the adjustable gasket 6. When the adjustment tube 61 is fully screwed into the positioning sleeve 62, the locking pin 81 is completely screwed in to disengage the locking pin 81 from the positioning ring 82, remove the jack, and position the bearing 5 and the adjustable gasket 6 against the support bearing 4, so that the exhaust gap reaches the optimal range.

[0032] See also Figure 7The fastening screw 85 is hollow, and an observation groove 86 is provided in the middle of the positioning ring 82. The inner wall of the observation groove 86 is composed of a sealing plate made of a low-hardness, easily-worn material, such as paraffin. The fastening screw 85 is inserted into the observation groove 86, and the fastening screw 85 and the observation groove 86 are sealed. The fastening screw 85 is connected to an observation tube 88, which passes through the sealing plug 87. The observation groove 86 corresponds to the axial position of the locking pin 81. When the radial clearance of the rotor group 3 becomes larger, the sealing plate will be quickly worn away, so that the observation groove 86 is connected to the inner cavity of the exhaust end seat 2, and the lubricating oil in the exhaust end seat 2 flows into the fastening screw 85 and the observation tube 88 through the observation groove 86. The staff can judge whether the radial clearance of the rotor group 3 is out of range by observing the lubricating oil in the observation tube 88, and make repairs in time to avoid irreparable losses. In other embodiments, the lubricating oil condition in the observation tube 88 can also be monitored by a sensor to automatically realize early warning.

[0033] The inner wall of the positioning ring 82 is a frustum, and the closer it is to the support bearing 4, the larger its diameter is. The end of the locking pin 81 is provided with a high-hardness grinding head. When the adjustable sleeve 6 and the positioning bearing 5 slide toward the support bearing 4 as a whole, the gap between the end of the locking pin 81 and the inner wall of the positioning ring 82 is just within an appropriate range. When installing the locking pin 81, it is only necessary to make the locking pin 81 leave the positioning ring 82, thereby reducing the length requirement for the locking pin 81 to be screwed into the positioning sleeve 62.

[0034] An elastic sheet 83 is provided at the bottom of the groove, and two groups of locking pins 81 and fastening screws 85 are provided. The two groups of locking pins 81 and fastening screws 85 are symmetrical up and down. The fastening screws 85 on the lower side are hollow and are installed with an observation tube 88. When the locking pin 81 is fully tightened, the locking pin 81 is close to the rotor shaft of the rotor group 3. The upper and lower groups of locking pins 81 are close to the rotor shaft of the rotor group 3, so that the two groups of locking pins 81 rotate around the axis of the rotor group 3 without eccentricity. Similarly, the fastening screws 85 make the positioning ring 82 close to the inner wall of the exhaust end seat 2, so that the center of the positioning ring 82 is on the center of the exhaust end seat 2.

[0035] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A screw air compressor, comprising a housing (1) and an exhaust end seat (2), wherein a rotor assembly (3) is installed in the housing (1), the housing (1) and the exhaust end seat (2) are fixed together by bolts, a rotor shaft of the rotor assembly (3) passes through the exhaust end seat (2) and is connected to a support bearing (4) and a positioning bearing (5), and a gland (7) is fixedly connected to the end of the exhaust end seat (2), characterized in that: An adjustable sleeve (6) is provided between the positioning bearing (5) and the supporting bearing (4), the adjustable sleeve (6) comprising a positioning sleeve (62), one end of the positioning sleeve (62) being movably sleeved with a telescopic head (63), and the other end being threadedly connected with an adjustment tube (61), the positioning sleeve (62) being connected with a locking member (8), the locking member (8) being capable of locking the relative positions of the positioning sleeve (62) and the telescopic head (63), and the depth of the adjustment tube (61) being screwed into the positioning sleeve (62) being within the exhaust gap range.

2. A screw air compressor according to claim 1, characterized in that: The locking member (8) includes a locking pin (81), which penetrates the side wall of the positioning sleeve (62) and is capable of being tightly attached to the telescopic head (63). The positioning sleeve (62) and the locking pin (81) are movably connected. When the locking pin (81) is pressed against the telescopic head (63), the relative positions of the positioning sleeve (62) and the telescopic head (63) are locked.

3. A screw air compressor according to claim 2, characterized in that: The bottom of the adjustment tube (61) is provided with a positioning groove (64), the inner ring of the support bearing (4) is provided with a protrusion corresponding to the positioning groove (64), the locking member (8) further includes a positioning ring (82), the positioning ring (82) can be fixedly connected to the exhaust end seat (2), the locking pin (81) passes through the positioning ring (82), the telescopic head (63) is provided with a groove relative to the position of the locking pin (81), the side of the pressing block on the locking pin (81) is elastic, when it enters the groove, its side presses the side of the groove, and only when the locking pin (81) contacts the bottom of the groove, the locking pin (81) is completely moved out of the positioning ring (82).

4. A screw air compressor according to claim 3, characterized in that: The positioning ring (82) is fixed to the exhaust end seat (2) by a fastening screw (85). The exhaust end seat (2) is provided with a fastening groove (89) for installing the fastening screw (85) and an operating hole (84) for tightening the locking pin (81) at a position corresponding to the positioning ring (82). The fastening groove (89) is an axial waist hole. When the positioning ring (82) is fixed, the operating hole (84) is aligned with the locking pin (81).

5. A screw air compressor according to claim 4, characterized in that: The fastening screw (85) is hollow, and an observation groove (86) is provided in the middle of the positioning ring (82). The inner wall of the observation groove (86) is composed of a sealing plate made of a material with low hardness and easy wear. One end of the fastening screw (85) is inserted into the observation groove (86) and communicated with the observation groove (86). The fastening screw (85) is connected to an observation tube (88), and the observation groove (86) corresponds to the axial position of the locking pin (81).

6. A screw air compressor according to claim 5, characterized in that: The inner wall of the positioning ring (82) is a frustum, the diameter of which increases as it approaches the support bearing (4), and a grinding head is provided at the end of the locking pin (81).

7. A screw air compressor according to claim 6, characterized in that: The locking pins (81) and the fastening screws (85) are each provided in two groups, and the two groups of locking pins (81) and fastening screws (85) are symmetrical in upper and lower directions.

8. The screw air compressor according to claim 6, characterized in that: An elastic sheet (83) is provided at the bottom of the groove, and when the locking pin (81) is tightened, the elastic sheet (83) is in close contact with the rotor shaft of the rotor assembly (3).

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