CN217381025U - Air compressor machine air-cooling structure and air compressor machine - Google Patents

Abstract

The utility model provides an air compressor machine air-cooled structure and air compressor machine belongs to the air compressor machine field, including locating the inlet channel that the order links to each other on the air compressor machine in proper order, cooling air flue and outlet channel, wherein the cooling air flue includes the pressure end air flue that the order links to each other, connects air flue and whirlpool end air flue, and cooling gas cools off bearing and pressure end radial bearing through pressing the end air flue earlier after inlet channel gets into, gets into whirlpool end air flue through connecting the air flue and cools off vortex end radial bearing, then flows into outlet channel and is discharged by the air compressor machine is inside. The utility model provides an air-cooled structure of air compressor machine, the cooling gas is not shunted after getting into the air compressor machine is inside, carries out the order cooling to each bearing of air compressor machine, makes the cooling gas of flowing through every department bearing can both keep enough big flow to improve the cooling effect of cooling gas to each bearing in the air compressor machine.

Description

Air compressor machine air-cooling structure and air compressor machine

Technical Field

The utility model belongs to the technical field of the air compressor machine, more specifically say, relate to an air compressor machine air-cooled structure and air compressor machine.

Background

The bearing to be cooled comprises a pressure end thrust bearing positioned at the pressure end of an air compressor, a pressure end radial bearing and a vortex end radial bearing positioned at the vortex end of the air compressor, wherein the pressure end thrust bearing is positioned in a first cavity formed by assembling a pressure end bearing seat and a pressure end sealing disc, the pressure end radial bearing is positioned between a rotating shaft of the air compressor and the pressure end bearing seat, the vortex end radial bearing is positioned between the vortex end bearing seat and the rotating shaft of the air compressor, the cooling gas is introduced into a shell and then is divided at an air inlet in the prior art, one path of the cooling gas enters the first cavity to cool the pressure end thrust bearing and the pressure end radial bearing, and the other path of the cooling gas enters a second cavity formed between the vortex end radial bearing seat and the vortex end to cool the vortex end radial bearing, like this the mode of cooling off is carried out the bearing at air compressor machine both ends simultaneously, because the reposition of redundant personnel appears in the cooling gas, leads to cooling gas flow that cools off bearing everywhere to diminish, and is relatively poor to the cooling effect of bearing.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an air compressor machine air-cooled structure to it is unreasonable to solve prior art cavity air compressor machine air-cooled structural design, leads to cooling gas flow not enough, to the not good problem of air compressor machine bearing cooling effect.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides an air compressor machine air-cooling structure, including offer on the air compressor machine and consecutive inlet channel, cooling air flue and air outlet channel in proper order.

The cooling air channel is arranged in the air compressor and comprises a pressure end air channel, a connecting air channel and a vortex end air channel, the air inlet channel is connected with the pressure end air channel, and the pressure end air channel is used for guiding cooling gas to cool a pressure end thrust bearing and a pressure end radial bearing; the gas outlet channel is connected with the vortex end gas channel, and the vortex end gas channel is used for guiding cooling gas to cool the vortex end radial bearing; the connecting air passage is formed by a gap between an air compressor rotating shaft and an air compressor stator and is used for communicating the pressure end air passage with the vortex end air passage.

As another embodiment of this application, the air compressor machine air-cooling structure still includes: intake passage includes vertical intake duct and horizontal intake duct, vertical intake duct is located on the air compressor casing, horizontal intake duct is located inside the air compressor casing lateral wall, is used for the intercommunication vertical intake duct with press the end air flue.

As another embodiment of this application, the air compressor machine air-cooling structure still includes: the pressure end air passage comprises a first radial air passage and a first axial air passage, and a first cavity formed by assembling a pressure end bearing seat and a pressure end sealing disc is communicated between the first radial air passage and the first axial air passage; the first radial air passage is arranged on the pressure end bearing seat and is used for communicating the air inlet passage; the first axial air passage is arranged on the side wall, close to the rotating shaft of the air compressor, of the pressure end bearing seat and is used for being communicated with the connecting air passage.

As another embodiment of this application, the air compressor machine air-cooling structure still includes: the number of the first radial air passages is multiple, the first radial air passages are communicated with the circumferential direction of the first chamber, and the first radial air passages are communicated with the air inlet channel through first annular air passages.

As another embodiment of this application, the air compressor machine air-cooling structure still includes: the pressure end air passage further comprises a second axial air passage which axially penetrates through the pressure end bearing seat, and the second axial air passage is communicated with the first cavity and the connecting air passage.

As another embodiment of this application, the vortex end air flue includes third axial air flue and the radial air flue of second, the second cavity that vortex end radial bearing frame and the assembly of the sealed dish of vortex end formed communicate in between third axial air flue and the radial air flue of second, third axial air flue is located on the radial bearing frame of vortex end is close to the lateral wall of air compressor machine pivot, is used for the intercommunication connect the air flue, the radial air flue of second is located on the sealed dish of vortex end, is used for the intercommunication air outlet channel.

As another embodiment of this application, the air compressor machine air-cooling structure still includes: the radial air flue of second is for radially seting up the recess on the sealed dish of vortex end, the recess is located the terminal surface that is close to vortex end bearing housing one side, the recess is kept away from the end of second cavity is equipped with the connecting hole, air outlet channel is connected to the connecting hole.

As another embodiment of this application, the air compressor machine air-cooling structure still includes: the second radial air passages are distributed on the vortex end sealing disc in a radial mode and are multiple, the connecting holes are communicated through the second annular air passages, and the air outlet passages are connected to the second annular air passages.

As another embodiment of this application, the air compressor machine air-cooling structure still includes: the air outlet channel is arranged inside the side wall of the volute at the vortex end and is used for communicating the second annular air channel with the volute exhaust port at the vortex end.

The utility model provides an air compressor machine forced air cooling structure's beneficial effect lies in: compared with the prior art, the utility model discloses the air-cooled structure of air compressor machine can make cooling gas get into the inside back order of air compressor machine by inlet channel and flow through and press the end air flue, discharge by outlet channel after connecting air flue and whirlpool end air flue, set up like this and make cooling gas get into the inside back of air compressor machine no longer shunt, through pressing the end air flue guide, at first cool off to pressing end footstep bearing and pressing the end radial bearing, flow into whirlpool end air flue through connecting the air flue again, cool off whirlpool end radial bearing, later discharge the air compressor machine outside by outlet channel again.

The utility model also provides an air compressor machine, include air compressor machine forced air cooling structure.

The utility model provides an air compressor machine's beneficial effect lies in: compared with the prior art, the utility model provides an air compressor machine includes above-mentioned air compressor machine air-cooled structure, has the beneficial effect of above-mentioned air compressor machine air-cooled structure, does not shunt after cooling gas introduces the air compressor machine inside, is held the flow direction whirlpool end by air compressor machine pressure in order, cools off each bearing inside the air compressor machine in proper order, can ensure like this that every air compressor machine bearing can both receive the gaseous cooling of the cooling of maximum flow to guarantee the cooling effect. Additionally, the utility model provides an air compressor machine establishes the gaseous air outlet channel of cooling on whirlpool end spiral case, makes the gaseous exhaust of whirlpool end gas vent of air compressor machine of cooling join the discharge, has practiced thrift the overall arrangement space on the air compressor machine casing, makes the air compressor machine structure compacter.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural view of an air cooling structure of an air compressor provided in an embodiment of the present invention;

fig. 2 is a schematic view of an air cooling structure at a pressure end of an air compressor according to an embodiment of the present invention;

fig. 3 is a schematic view of an air cooling structure at an air compressor end according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a pressure end radial bearing seat according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a vortex-end sealing disk according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

101. a rotating shaft of the air compressor; 102. an air compressor stator; 103; an air compressor housing; 104. a scroll-end volute; 1041. a volute tip exhaust port; 2. an air intake passage; 201. a longitudinal air inlet channel; 202. a transverse air inlet channel; 31. A pressure end air passage; 311. a first radial gas passage; 3111. connecting the inclined holes; 312. a first axial air passage; 313. A first annular air passage; 314. a second axial air passage; 32. connecting an air passage; 33. a vortex-end gas passage; 331. a third axial air passage; 332. a second radial gas passage; 333. connecting holes; 4. an air outlet channel; 41. a second annular air passage; 51. pressing end bearing seats; 511. a pressure end radial bearing seat; 512. a pressure end thrust bearing seat; 52. a pressure end sealing disc; 53. a first chamber; 61. a scroll end bearing block; 62. a scroll-end sealing disk; 63. a second chamber.

Detailed Description

In order to make the technical problem, technical solution and beneficial effects to be solved by the present invention more clearly understood, the following description is made in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in operation, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, the air cooling structure of the air compressor according to the present invention will now be described. The utility model provides an air compressor machine air-cooled structure, is including locating on the air compressor machine and consecutive inlet channel 2, cooling air flue and air outlet channel 4 in proper order.

The air inlet channel 2 is used for guiding cooling gas to enter the air compressor; the cooling air channel is positioned inside the air compressor and comprises a pressure end air channel 31, a connecting air channel 32 and a vortex end air channel 33 which are sequentially connected, wherein the air inlet channel 2 is connected with the pressure end air channel 31, the air outlet channel 4 is connected with the vortex end air channel 33, the pressure end air channel 31 is used for guiding cooling gas to cool a pressure end thrust bearing and a pressure end radial bearing, the vortex end air channel 33 is used for guiding cooling gas to cool the vortex end radial bearing, and the connecting air channel 32 is formed by a gap between an air compressor rotating shaft 101 and an air compressor stator 102 and is used for communicating the pressure end air channel 31 and the vortex end air channel 33; the air outlet channel 4 is used for discharging cooling gas.

The utility model provides an air-cooled structure of air compressor machine, compared with the prior art, cooling gas gets into the inside back order flow of air compressor machine by inlet channel 2 and presses end air flue 31, discharge by outlet channel 4 behind connection air flue 32 and vortex end air flue 33, it no longer shunts to set up like this to make cooling gas get into the inside back of air compressor machine, through pressing end air flue 31 guide, at first cool off to pressing end footstep bearing and pressing end radial bearing, flow into vortex end air flue 33 through connecting air flue 32 again, cool off vortex end radial bearing, later discharge the air compressor machine outside by outlet channel 4 again. The utility model provides an air-cooled structure of air compressor machine because the gaseous reposition of redundant personnel of cooling carries out the order cooling to each bearing of air compressor machine, makes the cooling gas of every department of bearing of flowing through can both keep enough big flow to improve the cooling effect of cooling gas to each bearing in the air compressor machine.

Please refer to fig. 1 to 2, as the utility model provides an air cooling structure of air compressor, air inlet channel 2 includes longitudinal air inlet channel 201 and transverse air inlet channel 202, and longitudinal air inlet channel 201 is located on the air compressor casing 103, and transverse air inlet channel 202 is located inside the air compressor casing 103 lateral wall for communicate longitudinal air inlet channel 201 and pressure end air flue 31.

Further, the longitudinal air inlet 201 is arranged in the middle of the outer side of the air compressor shell 103, and is conveniently connected with external equipment. The transverse air inlet channel 202 is a blind hole which is arranged on the flange surface of the pressure end of the air compressor shell 103 and extends to the vortex end of the air compressor along the axial direction of the air compressor, and the tail end of the blind hole is communicated with the longitudinal air inlet channel 201.

Further, the diameter of the blind hole is smaller than the caliber of the longitudinal air inlet channel 201.

Referring to fig. 1 to 2, as a specific embodiment of the air cooling structure of the air compressor according to the present invention, the pressure end air passage 31 includes a first radial air passage 311 and a first axial air passage 312, and a first chamber 53 formed by assembling the pressure end bearing seat 51 and the pressure end sealing disk 52 is communicated between the first radial air passage 311 and the first axial air passage 312; the first radial air passage 311 is arranged on the pressure end bearing seat 51 and is used for communicating with the air inlet channel 2; the first axial air passage 312 is disposed on the side wall of the pressure end bearing seat 51 close to the air compressor rotating shaft 101, and is used for communicating with the connecting air passage 32.

Further, first radial air flue 311 quantity is a plurality of, and a plurality of first radial air flue 311 communicate in the circumference of first cavity 53, and a plurality of first radial air flue 311 communicate inlet channel 2 through first annular air flue 313, so set up, can make cooling gas be full of first cavity 53 fast through a plurality of first radial air flue 311, cool off pressing end thrust bearing simultaneously by pressing end thrust bearing's circumference, realize rapid cooling.

Further, the first annular air duct 313 is disposed at one end of the pressure end bearing seat 51 away from the air compressor rotating shaft 101.

Further, the first axial air passage 312 is a groove axially penetrating the side wall of the pressure end bearing block 51 close to the air compressor rotating shaft 101.

Further, the pressure end air passage 31 further includes a second axial air passage 314 axially penetrating through the pressure end bearing seat 51, and the second axial air passage 314 communicates the first chamber 53 with the connecting air passage 32. So set up for first chamber 53 communicates the route of connecting air flue 32 and becomes two, is favorable to the gaseous transmission of cooling to connecting air flue 32 by first chamber 53 fast.

Further, the second axial air 314 is located on one side of the pressure end bearing seat 51 far away from the air compressor rotating shaft 101, and the number of the second axial air 314 is multiple and the second axial air is distributed annularly, so that the part of the first chamber 53 far away from the air compressor rotating shaft 101 is communicated with the chamber formed by the air compressor stator 102 and the pressure end bearing seat 51, and thus the communication with the connecting air duct 32 is realized.

Please refer to fig. 2 and fig. 4, as the utility model provides an air cooling structure of air compressor machine's a specific implementation, press end bearing frame 51 including pressing end radial bearing frame 511 and pressing end thrust bearing frame 512, press end sealed dish 52 and press end thrust bearing frame 512 assembly cooperation, press end radial bearing frame 511 to be located and press end thrust bearing frame 512 to keep away from one side of pressing end sealed dish 52, press end radial bearing to locate between air compressor machine pivot 101 and the pressure end radial bearing frame 511.

The pressure end radial bearing seat 511 is ring-shaped, the annular middle part is provided with a yielding groove, the yielding groove is used for installing a pressure end thrust bearing, wherein, the first radial air passage 311 is arranged on the pressure end radial bearing seat 511, and the number of the round holes is a plurality of, and the ring is distributed in the circumferential direction of the yielding groove.

The first annular air passage 313 is an annular groove which is arranged on the end surface of the pressure end radial bearing seat 511 close to one side of the pressure end thrust bearing seat 512 and is positioned outside the yielding groove, and the annular groove enables the plurality of first air passages 311 to be communicated.

A connecting inclined hole 3111 is arranged in the first annular air passage 313, and the connecting inclined hole 3111 penetrates through to one side of the pressure end radial bearing seat 511, which is far away from the pressure end supporting leg bearing seat 512, and is connected with the transverse air inlet passage 202 in a matching manner, so that the transverse air inlet passage 202 is communicated with the first annular air passage 313.

The first axial air channel 312 is a groove formed on the side wall of the pressure end radial bearing seat 511 close to the air compressor rotating shaft 101. The second axial air passage 314 is divided into two sections, one of the two sections is a circular hole penetrating through two end faces of the pressure end radial bearing seat 511, is positioned between the abdicating groove and the annular groove, and is communicated with a chamber between the pressure end radial bearing seat 511 and the air compressor stator 102, and the other section is a circular hole correspondingly arranged on the pressure end thrust bearing seat 512 and penetrating through the upper end face and the lower end face of the pressure end thrust bearing seat 512, and is communicated with the first chamber 53.

Preferably, the number of the first axial air passages 312 is plural, and the first axial air passages are arranged on the side wall of the pressure end bearing block 51 close to the air compressor rotating shaft 101 in an alternate mode. The arrangement of the plurality of first axial air passages 312 enables the cooling air to rapidly pass through the first axial air passages 312 and simultaneously fully cool the radial bearing at the pressure end.

Preferably, the connection inclined hole 3111 connects the transverse air intake passage 202 and the first annular air passage 313 by communicating with one of the first radial air passages 311.

Please refer to fig. 1, fig. 3 and fig. 5, as the utility model provides a specific implementation of air cooling structure of air compressor, the vortex end air passage 33 includes third axial air passage 331 and second radial air passage 332, the second cavity 63 that the assembly of vortex end bearing seat 61 and vortex end sealing disk 62 formed communicates between third axial air passage 331 and second radial air passage 332, third axial air passage 331 is located on the lateral wall that vortex end bearing seat 61 is close to air compressor pivot 101, be used for the intercommunication to connect air passage 32, second radial air passage 332 is located on the vortex end sealing disk 62, be used for communicating outlet channel 4.

Further, the second radial air passage 332 is a groove radially opened on the end surface of the scroll-end sealing disk 62 close to the scroll-end bearing seat 51, the end of the groove far away from the second chamber 63 is provided with a connecting hole 333, and the connecting hole 333 is connected with the air outlet channel 4.

Further, the second radial air passage 332 is plural and radially distributed on the scroll-end sealing disk 62, the plural connecting holes 333 are communicated through the second annular air passage 41, and the air outlet passage 4 is connected to the second annular air passage 41.

Further, the second annular gas passage 41 is an annular groove provided on the fitting end surface of the scroll-end volute 104 and the scroll-end seal disk 62.

Further, the third axial air passage 331 is a groove axially opened on the side wall of the scroll end bearing block 61 close to the air compressor rotating shaft 101.

Further, the number of the grooves is multiple, and the grooves are distributed on the side wall, close to the air compressor rotating shaft 101, of the vortex end bearing seat 61 at intervals in an annular manner.

Referring to fig. 1 and 3, as a specific embodiment of the air cooling structure of the air compressor according to the present invention, the air outlet channel 4 is disposed inside the sidewall of the volute 104 at the vortex end, and is used for communicating the second annular air channel 41 with the exhaust outlet 1041 at the vortex end.

In this embodiment, changed the conventional design of locating air outlet channel 4 on air compressor machine casing 103 among the prior art, through locating air outlet channel 4 near inside vortex end volute 104 lateral wall, make cooling gas and air compressor machine vortex end exhaust confluence discharge, just so, practiced thrift the design space of air compressor machine casing 103.

The utility model also provides an air compressor machine has used foretell air compressor machine forced air cooling structure.

The utility model also provides a pair of air compressor machine's beneficial effect lies in: compared with the prior art, the utility model provides an air compressor machine includes above-mentioned air compressor machine air-cooled structure, has the beneficial effect of above-mentioned air compressor machine air-cooled structure, does not shunt after cooling gas introduces the air compressor machine inside, is held the flow direction whirlpool end by air compressor machine pressure in order, cools off each bearing inside the air compressor machine in proper order, can ensure like this that every air compressor machine bearing can both receive the gaseous cooling of the cooling of maximum flow to guarantee the cooling effect. Additionally, the utility model provides an air compressor machine establishes inside whirlpool end spiral case 104 with the gaseous air outlet channel 4 of cooling, makes the gaseous and air compressor machine whirlpool end gas vent exhaust of cooling join the discharge, has practiced thrift the overall arrangement space on the air compressor machine casing 103, makes the air compressor machine structure compacter, the installation of being convenient for.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An air cooling structure of an air compressor is characterized by comprising an air inlet channel (2), a cooling air channel and an air outlet channel (4) which are arranged on the air compressor and sequentially connected in sequence;

the cooling air channel is arranged in the air compressor and comprises a pressure end air channel (31), a connecting air channel (32) and a vortex end air channel (33), the air inlet channel (2) is connected with the pressure end air channel (31), and the pressure end air channel (31) is used for guiding cooling gas to cool a pressure end thrust bearing and a pressure end radial bearing; the air outlet channel (4) is connected with the vortex end air passage (33), and the vortex end air passage (33) is used for guiding cooling gas to cool the vortex end radial bearing; the connecting air passage (32) is formed by a gap between an air compressor rotating shaft (101) and an air compressor stator (102) and is used for communicating the pressure end air passage (31) with the vortex end air passage (33).

2. The air compressor air cooling structure as claimed in claim 1, wherein the air inlet passage (2) comprises a longitudinal air inlet (201) and a transverse air inlet (202), the longitudinal air inlet (201) is arranged on the air compressor housing (103), and the transverse air inlet (202) is located inside the side wall of the air compressor housing (103) and is used for communicating the longitudinal air inlet (201) with the pressure end air passage (31).

3. The air cooling structure of the air compressor as claimed in claim 1, wherein the pressure end air passage (31) comprises a first radial air passage (311) and a first axial air passage (312), and a first chamber (53) formed by assembling the pressure end bearing seat (51) and the pressure end sealing disk (52) is communicated between the first radial air passage (311) and the first axial air passage (312); the first radial air passage (311) is arranged on the pressure end bearing seat (51) and is used for communicating the air inlet channel (2); the first axial air passage (312) is arranged on the side wall, close to the air compressor rotating shaft (101), of the pressure end bearing seat (51) and used for being communicated with the connecting air passage (32).

4. The air compressor air cooling structure according to claim 3, wherein the number of the first radial air passages (311) is plural, the plural first radial air passages (311) communicate with the circumferential direction of the first chamber (53), and the plural first radial air passages (311) communicate with the air intake passage (2) through the first annular air passage (313).

5. The air compressor air-cooling structure as claimed in claim 3, wherein said pressure end air duct (31) further comprises a second axial air duct (314) axially penetrating through the pressure end bearing seat (51), said second axial air duct (314) communicating said first chamber (53) with the connecting air duct (32).

6. The air compressor air cooling structure as claimed in any one of claims 1 to 5, wherein the scroll end air passage (33) comprises a third axial air passage (331) and a second radial air passage (332), a second chamber (63) formed by assembling the scroll end bearing seat (61) and the scroll end sealing disk (62) is communicated between the third axial air passage (331) and the second radial air passage (332), the third axial air passage (331) is arranged on the side wall of the scroll end bearing seat (61) close to the air compressor rotating shaft (101) and is used for communicating the connecting air passage (32), and the second radial air passage (332) is arranged on the scroll end sealing disk (62) and is used for communicating the air outlet channel (4).

7. The air compressor air cooling structure as recited in claim 6, characterized in that the second radial air passage (332) is a groove radially opened on the scroll-end sealing disk (62), the groove is located on the end surface close to the scroll-end bearing seat (61), the end of the groove far away from the second chamber (63) is provided with a connecting hole (333), and the connecting hole (333) is connected with the air outlet channel (4).

8. The air cooling structure of the air compressor according to claim 7, wherein the second radial air passages (332) are plural and radially distributed on the scroll-end sealing plate (62), the plural connecting holes (333) are communicated through a second annular air passage (41), and the air outlet passage (4) is connected to the second annular air passage (41).

9. The air compressor air cooling structure as claimed in claim 8, wherein the air outlet passage (4) is provided inside the sidewall of the scroll-end volute (104) for communicating the second annular air passage (41) with the scroll-end volute exhaust port (1041).

10. An air compressor characterized by comprising the air compressor air-cooling structure of any one of claims 1 to 9.

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