JP3622122B2 - Multi-cylinder reciprocating compressor inlet connection structure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an improvement in the structure of a suction port connecting portion in a multi-cylinder reciprocating compressor in which suction ports are gathered and intake is performed via a single suction filter.
[0002]
[Prior art]
V-type multi-cylinder reciprocating compressors include two-cylinder, three-cylinder, etc., and two-stage compressors include a low-pressure side cylinder having two cylinders. In these compressors, a suction filter for preventing dust and the like when air is sucked is provided. Many of the suction filters are attached to each cylinder.
[0003]
However, if the number of suction filters attached to each cylinder is reduced to one, it is obvious that the cost can be reduced. Bringing together the suction filter of the cylinders into one, it becomes necessary to communicating pipe that connects the suction port of each cylinder. The communication Tsukan is when the intake air, so that it is not subject to large intake resistance, it must have sufficient thickness.
[0004]
Further, due to the through hole for the bolt for attaching the cylinder, the mounting angle of the cylinder, etc., the accuracy of the suction port position , interval and parallelism of each cylinder is relatively low. Therefore, the communicating pipe connecting the suction port between the cylinders, it is necessary to flexible ones.
[0005]
As a flexible communicating tube, there is a rubber or plastic hose, conventionally, such hoses are used, insert the suction port was attached tightened with a hose band. However, the rubber or resin hose may be crushed by the negative suction pressure, and the pressure may increase due to the blow-back phenomenon from the unloader that occurs when the compressor is stopped.
[0006]
In order to prevent this crushing and to withstand this negative pressure and high pressure, the hose must be thick, but doing so will impair flexibility and work when installing to the compressor. Sexuality gets worse.
[0007]
On the other hand, there is a method of connecting by a flange method using a metal bellows having flexibility, but it is difficult to adopt because of high cost.
[0008]
Another method is to weld flanges to both ends of a copper pipe, etc., perform bending according to the suction port of each machine, and adjust the size of each piece for installation. Cost.
[0009]
[Problems to be solved by the invention]
As described above, in the case of using a flexible hose as a communicating pipe connecting the suction port between the cylinders of a multi-cylinder compressor, in order to increase the thickness of the thick hose, flexibility is impaired, the assembly Sexuality gets worse. In addition, when using a flange-shaped copper pipe, bending must be performed in accordance with the interval between the suction ports.
[0010]
It is an object of the present invention to obtain a connection mechanism that communicates a suction port that is easy to assemble using a rigid pipe made of metal or the like that can easily cope with a change in air pressure.
[0011]
[Means for Solving the Problems]
According to the present invention, the above object is achieved, two or more cylinders to set the inlet of the reciprocating compressor, the multi-cylinder reciprocating compressor comprising close to one of the suction filter, and set the inlet of each cylinder The connecting pipe 1 for connection is made of a pipe having rigidity such as metal, and is adjacent to the mounting port 2d for the suction port 6 in the cylinder cover 11 of the cylinder 12 and the mounting port 2b for mounting the suction filter 5. The cylinder cover 11 is provided with a mounting port 2d in the three-way suction port joint 2 in which three joint portions are formed with the spigot portion 2a for fitting the communication pipe 1 facing the suction port of the cylinder 12a of the reciprocating compressor. To the cylinder cover 11a in the adjacent reciprocating compressor and the three-way inlet joy when attached to the cylinder cover 11a. Mounting the mounting port in the two-way suction joint 3 having the connecting part 1a for mounting the communication pipe 1 fitted to the connecting part 2a of the second reciprocating part 2 to the cylinder cover 11a in the adjacent reciprocating compressor; The inlet portions 2a and 3a to which the communicating pipes 1 in the two suction joints 2 and 3 are fitted are provided with O-rings 4 having rubber elasticity for sealing air pressure, and thus the communicating pipes 1 are connected to the respective inlet portions 2a, The problem is solved by enabling the sliding in the axial direction in 3a and the inclination of the axial line.
[0012]
[Action]
The inlet filter for a multi-cylinder reciprocating compressor in order to one, the communicating pipe that connects the suction port in each cylinder, or aluminum alloy using a pipe material having a strength and rigidity such as copper, the suction of the cylinders the inlet joint attached to the mouth, the fitting portions for fitting engagement with said communicating pipe is provided in the spigot portion, and bored O-ring groove, is fitted an O-ring with a rubber elasticity, the communication when fitting engagement the through tube, with a margin in the length in the fitting direction, in contact with the inner O-ring of the communication pipe becomes to be sealed.
[0013]
Further, the outer surface of the spigot portion, the gap is large between the inner surface of the communication pipe, and even if there is lateral displacement to the central axis of the fitting portions of the two inlet joint between cylinders, communicating tube with respect to the central axis, it is connected to the fitting inclined. Thereby, the deviation between the inlet produced during assembly of the cylinder is regulated by sliding in the axial direction of the fitting section of the socket portion of the communicating pipe, also lateral displacement of the fitting portions of the suction port joint, with respect to the central axis of the socket portion, the communicating pipe Ru is adjusted by tilting.
[0014]
【Example】
Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partially sectional exploded view showing a three-way inlet joint and a conducting tube for collecting the inlets of a multi-cylinder reciprocating compressor, and FIG. 2 is a longitudinal side view of the three-way inlet joint for attaching a suction filter. .
[0015]
1 is a communicating pipe made of a material having rigidity such as an aluminum alloy or a copper pipe. 2, three-way with inlet joint, and the mounting hole 2b for attaching the suction filter 5, and a spigot portion 2a for fitting engagement connecting pipe 1, three of the mounting opening 2d to the suction port of the cylinder cover 11 joint portion is formed at a position between the corresponding angle of the intake port 6 are drilled in the cylinder cover 11 in accordance with a cylinder arrangement for a multi-cylinder compressor.
[0016]
An O-ring groove 2c is formed at a substantially intermediate position on the outer surface of the inlay portion 2a, and an O-ring 4 made of a rubber elastic material is fitted into the O-ring groove 2c. Plug connecting pipe 1 to the spigot portion 2a, and freely of the inner surface and the sliding communicating tube 1 by the O-ring 4, to adjust the distance between the two-way inlet joint 3. The outer diameter of the O-ring 4 is slightly larger than the outer diameter of the spigot part 2a.
[0017]
The two-way inlet joint 3, there is no need of mounting opening of inlet filter, and a mounting opening for mounting the cylinder cover 11a, only two directions of the fitting portions 3a for fitting engagement connecting pipe 1 It is suitable. The spigot part 3 a of the two-way inlet joint 3 is formed at an angle that faces the direction of the spigot part 2 a of the three-way inlet joint 2. The spigot portion 3a, as with the spigot portion 2a of the three-way inlet joint 2, O-ring groove is bored, O-ring 4 is fitted.
[0018]
Since the communication pipe 1 seals the sliding surface of the inner surface 1b with the spigot portion with the O-ring 4, a drawn pipe or the like that is smoothly finished is used. Between the spigot portion 2a, 3a outer surface and communicating tube 1 of the inner surface of, there is a gap sufficient fit, at the time of installation of the inlet joint 2 and 3, fitting portions 2a, 3a central axis of some Even if it deviates, the misalignment is absorbed and set.
[0019]
In order to provide a clearance sufficient fit to fitting portion of the fitting portions 3a and the communication pipe 1, O-ring 4 which is fitting engagement in O-ring groove 2c protrudes above clearance fit, the communicating pipe When 1 is inserted, the projection height has a sufficient crushing allowance. And it is a crushing margin that can completely seal the negative suction pressure during intake and the blown-back air pressure during unloader operation.
[0020]
At both ends of the communication pipe 1, spigot portion 2a, and for ease of insertion into 3a, in order to increase the angle of tolerance communicating tube 1 is inclined with respect to the central axis, a relatively large A chamfer 1a is applied. The chamfer is not intended to limit the present invention, for example, when using a thin-walled pipe, also extends the both ends of the communication pipe 1 into an arcuate shape, the same effect can be obtained.
[0021]
As shown in FIG. 2, the three-way inlet joint 2 is fixed to the joint 10 of the inlet of the cylinder cover 11 with a locking screw. In the center position corresponding to the intake port 6 in the joint portion 10, screw holes for attaching the stud 7 are bored. A mounting port 2 d of the three-way suction port joint 2 is joined to the suction port 6 of the joint portion 10 configured in the cylinder cover 11. For the joining , a through hole 2f that penetrates the center of the mounting port 2d is inserted into a stud 7 that is planted in the screw hole of the joint portion 10 and tightened with a nut 8, and the mounting port is connected to the suction port 6. 2d is joined through packing. This joint is rotatable, and is fixed with a nut 8 at a position where the spigot 2a of the three-way suction joint 2 is on the same axis as the central axis of the spigot 3a of the two-way suction joint 3.
A female thread 2e for mounting the suction filter 5 is cut on the upper part of the three-way suction joint 2 and the suction filter 5 is screwed into the female thread 2e.
[0022]
When fitting the communicating pipe 1 in advance, the three-way and socket portion 2a of the inlet joint 2, two-way fitted connecting pipe 1 to the spigot portion 3a of the inlet joint 3, both inlet joint 2a, 3a Assembling as a set with a suction, align the position with the implantation bolt 7 implanted in the cylinder cover and the implantation bolt (not shown) similarly implanted in the two-way inlet joint 3 The bolt through holes 2f of the mouth joints 2 and 3 are inserted.
When inserting, according to the position of the suction port of both cylinders, the position which contacts the O-ring 4 inserted in the spigot part 2a, 3a in the communicating pipe 1 slides, and an attachment space | interval is adjusted. Further, the center axes of both the spigot portions 2a and 3a are also automatically adjusted to the center axis since both the suction port joints are rotatably joined. Perpendicularity deviation between stud 7 and the communication pipe 1, and positional deviation, etc. from the central axis of the communicating pipe 1 is absorbed by the communicating tube 1 is inclined at both fitting portions 2a, 3a . After adjusting the position by inserting both the inlet joints 2 and 3, the nut 8 is tightened and fixed.
[0023]
1 and 2, the three-way inlet joint 2 and the two-way inlet joint 3 have been described as the inlet joint. However, in the case of a one-stage three-cylinder, the two-way inlet joint is a three-way inlet joint.
Further, when the suction filter 5 is provided in the central cylinder of the three cylinders, it becomes a four-way inlet joint, and the mounting angle of the joint hole and the spigot portion provided in the inlet joint varies depending on the cylinder arrangement. It will be a thing. The inlet joints 2 and 3 are made of an aluminum alloy and are formed by die casting.
[0024]
FIG. 3 is a side view when the low pressure side of the two-stage reciprocating compressor has two cylinders, and shows an embodiment of the present invention in which the suction ports of the low pressure side cylinders are assembled. The same components as those described in FIGS. 1 and 2 are denoted by the same reference numerals.
[0025]
Cylinder covers 11 and 11a are fastened on the low-pressure side cylinders 12 and 12a by four bolts 15 and 15a, respectively. The bolt holes of the cylinder covers 11 and 11a have a play with respect to the diameter of the bolt. For this reason, the mounting position of the cylinder cover has an allowance for a lateral shift with respect to the central axis of the cylinder.
[0026]
In addition, the cylinders 12 and 12a attached to the crankcase 22 with four bolts 16 and 16a, respectively, are also tolerant of left and right displacement. Further, a slight machining error is allowed for the mounting angle of the cylinder mounted on the crankcase 22 with the flange surface.
[0027]
From the above, the position of the suction port 6 of the cylinder cover varies in the height from the crankcase 22, the direction of the suction port, the flatness of the suction port, and the parallelism for each compressor. Therefore, conventionally, it has been necessary to connect with a flexible hose or the like.
[0028]
However, in the present invention, both the suction port joints 2 and 3 are inserted into the through-holes 2f of the suction port joint so as to be freely rotatable with the studs 7 and 7a, so that the height of the cylinder and the angle between the two cylinders 12 and 12a are increased. The error is adjusted by the rotation.
Further, as described above, the interval between the holes of the suction port is adjusted by sliding at the spigot portion. Parallelism of the two inlet holes, and variations dimensions of flatness of both inlet surface is sufficiently imparted a clearance fit between the communication pipe and the socket portion, the communicating pipe is absorbed by tilting.
[0029]
3, because it has a connection to a set of more inlet, the air sucked from one of the suction filter 5, and is via a communicating pipe 1 is branched into passages sucked directly, cylinder It enters into the cover 11, 11a, and is sucked into the cylinder 12, 12a through the suction valve. The air compressed by the rising of the piston enters the respective intercoolers 14 and 14a through the introduction pipes 17 and 17a via the discharge valve, and the air containing the cooled and condensed water is introduced by one. The first-stage compressed air collected in the pipe 19 and introduced into the oil-water separator 18 and separated from the oil-water is compressed in the second stage by the high-pressure side cylinder 13 and discharged to an air tank or the like.
[0030]
The thin pipe 20 communicating with the cylinder covers 11, 11a, 21 is a pilot air pipe for controlling the operation of the compressor.
[0031]
【The invention's effect】
The present invention, as described above, to the one suction filter by assembling the inlet of a multi-cylinder reciprocating compressor, when attaching a communicating pipe for communicating the suction port between the cylinder cover, suction provided fitting portions the inlet joint attached to the mouth, and fitting engagement with O-ring in the fitting portions, as well as fitting engagement connecting pipe slidably on both fitting portions, communicating fitted to spigot portion Since the inner diameter of the pipe has a sufficient fitting gap that allows the communication pipe to be inclined, even if there are variations in the interval, parallelism, and flatness of the suction ports between the cylinders, In addition, there is no need to perform bending work, and the connection work of the suction port communication passage becomes easy, and the effect of reducing the processing man-hours, the assembly man-hours, and the component unit cost is achieved.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional exploded view showing a connection structure in which suction ports of the present invention are assembled and conducted.
FIG. 2 is a side view of a three-way inlet joint for mounting the suction filter of the present invention.
FIG. 3 is a side view of the suction port connection structure of the present invention attached to a two-stage reciprocating compressor.
[Explanation of symbols]
1 communicating tube 1a chamfer 1b inner surface 2 three-way inlet joint 2a spigot part 2b mounting port 2c O-ring groove 2d mounting port 2e female thread 2f through hole 3 two-way inlet joint 3a spigot part 4 O-ring 5 suction filter 6 suction port 7 7a Stud bolt 8 Nut 10 Joint part 11, 11a Cylinder cover 12, 12a Cylinder 14, 14a Intermediate cooler 15, 15a Bolt 16, 16a Bolt 17, 17a Inlet pipe 18 Oil / water separator 19 Inlet pipe 20 Pipe 21 Cylinder cover 22 Crankcase

Claims (1)

In a multi-cylinder reciprocating compressor in which the suction ports of two or more reciprocating compressors are assembled and connected to a single suction filter, a communication pipe for collecting and connecting the suction ports of each cylinder ( 1 ) and it consisted of a pipe having a rigidity such as metal, a cylinder (12) of the mounting opening for the inlet (6) in the cylinder cover (11) and (2d), the suction filter (5) mounting port for mounting ( 2b) and three-way suction with three joints formed between the spigot part (2a) for fitting the communication pipe ( 1 ) facing the suction port of the cylinder (12a) of the adjacent reciprocating compressor attaching mounting opening of (2d) to the cylinder cover (11) in the mouth joint (2), and a mounting opening for mounting the cylinder cover (11a) in a reciprocating compressor next, when attached to the cylinder cover (11a) in, fitted the the socket portion of the three-way inlet joint (2) (2a) And communicating pipe has a mounting opening in the fitting portions for attaching the (3a) two-way inlet joint and a (3) (1), attached to the cylinder cover in a reciprocating compressor next (11a), further wherein both inlet joint (2) (3) fitting portions that communicating tube (1) are fitted in the provided (2a) O-ring having rubber elasticity for sealing the air pressure (3a) (4), with the communicating pipe ( 1 ) can be slid in the axial direction in each spigot part (2a) (3a) , and the axial line can be inclined. Construction.

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