JP4201620B2 - Multi-cylinder one-stage compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-cylinder single-stage compressor provided with a plurality of compression units.
[0002]
[Prior art]
Conventionally, various types of compressors that suck and compress gas are known. Among them, there is a multi-cylinder type compressor having a plurality of compression parts, for example, four compression parts are arranged in a cross shape, and pistons of two opposing compression parts are collinear with both ends of one yoke. The pistons of the other two compression parts facing each other are mounted on the same line at both ends of the other yoke positioned 90 degrees out of phase with the one yoke. The two yokes are reciprocated with a phase shift of 90 ° in the orthogonal direction by means of a crank pin provided on the crankshaft that rotates on the shaft, and the two yokes are mounted on the same line in the orthogonal direction via these yokes. There is a configuration in which the piston is reciprocated in a cylinder so that gas is compressed by four compression portions (for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2001-82332 [0004]
Such multi-cylinder compressors are classified into a single-stage compression system and a multi-stage compression system. In the case of the above-described four cylinders, in the one-stage compression method, the compressed gas compressed by the first compression unit and the compressed gas compressed by the second compression unit are merged in a pipe line, and the cylinder head of the fourth compression unit And the compressed gas compressed by the third compression section is fed into the cylinder head of the fourth compression section through a conduit, and the compressed gas compressed by the fourth compression section is discharged into the cylinder head. After all the compressed gas from 1 compression part-4th compression part is made to merge, it discharges from the discharge part of a 4th compression part.
[0005]
[Problems to be solved by the invention]
In the conventional four-cylinder one-stage compressor, since the compressed gas compressed by the first compression unit to the third compression unit is fed into the cylinder head of the fourth compression unit, the pressure in the cylinder head in the fourth compression unit is High pressure. For this reason, when the compressed gas compressed by the 4th compression part is discharged in a cylinder head, it becomes difficult to discharge under the influence of the back pressure by the high-pressure compressed gas in a cylinder head. If the discharge into the cylinder head is not smoothly performed, the compression at the fourth compression section becomes overcompressed, and there is a problem that the piston ring is worn early and the durability is inferior.
[0006]
The present invention is made in order to solve such a conventional problem, and in a multi-cylinder one-stage compressor, it prevents overcompression in a compression unit into which compressed gas compressed in a plurality of compression units is sent, An object of the present invention is to provide a multi-cylinder single-stage compressor that protects a piston ring from premature wear.
[0007]
[Means for Solving the Problems]
As means for achieving the above object, the invention of claim 1, comprising a plurality of compressed portions, with Komu feeding compressed gas compressed by the compression unit to the cylinder head of the specific compression unit, of the specific In the multi-cylinder one-stage compressor configured to discharge the compressed gas compressed by the compression unit to the cylinder head, join and discharge from the discharge unit of the specific compression unit, the compression unit excluding the specific compression unit The multi-cylinder single-stage compressor is characterized in that the compressed gas compressed by at least one of the compression sections is sent to the discharge section of the specific compression section without being sent to the cylinder head of the specific compression section.
[0008]
According to a second aspect of the present invention, the multi-cylinder one-stage compressor is a four-cylinder one-stage compressor, the specific compressor is a fourth compression section, and a compressed gas compressed by the first compression section, The compressed gas compressed by the second compression unit is merged and fed into the cylinder head of the fourth compression unit, and the compressed gas compressed by the fourth compression unit is discharged to the cylinder head and merged, thereby the third compressor The compressed gas compressed in step 4 is not sent to the cylinder head of the fourth compression unit , but is sent into the discharge unit disposed adjacent to the cylinder head, and the compressed gas and the compressed gas merged in the cylinder head are merged. The multi-cylinder single-stage compressor according to claim 1, wherein the multi-cylinder single-stage compressor discharges from the discharge unit.
[0009]
In the present invention, in a multi-cylinder single-stage compressor provided with a plurality of compression units, the compressed gas compressed by at least one compression unit is not sent into the cylinder head of a specific compression unit that joins the compressed gas. The piston ring is configured to feed into the discharge section of a specific compression section, and by reducing the pressure in the cylinder head of the specific compression section, it facilitates the discharge of compressed gas at the specific compression section and prevents over compression. Can prevent early wear.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a multi-cylinder single-stage compressor according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic sectional view showing an embodiment applied to a four-cylinder one-stage compressor.
[0011]
In FIG. 1, 1 is a 1st compression part, 2 is a 2nd compression part, 3 is a 3rd compression part, 4 is a 4th compression part, the 1st compression part 1 and the 3rd compression part are opposingly arranged, and a yoke The second compression section 2 and the fourth compression section 4 are disposed opposite to each other so as to be positioned on the same line at both ends, and are positioned below the yoke 5 and shifted in phase by 90 degrees in the horizontal plane with the yoke 5. The yoke 6 is attached to both ends so as to be located on the same line.
[0012]
The yokes 5 and 6 are actuated via crank pins (not shown) eccentrically provided on a crankshaft 7 that is rotated by an electric motor (not shown). The yoke 5 is moved up and down in FIG. The first compression unit 1 and the third compression unit 3 are moved by reciprocating only in the direction, and the yoke 6 is reciprocated only in the left-right direction in FIG. 1 to move the second compression unit 2 and the fourth compression unit.
[0013]
In this four-cylinder one-stage compressor, pipes P1 and P2 are formed in which the compressed gases compressed by the first compression unit 1 and the second compression unit 2 are merged and sent to the fourth compression unit 4, and the third compression unit 3 A pipe line P3 for feeding the compressed gas compressed in step 4 to the fourth compression section 4 is formed.
[0014]
In the present invention, as shown in FIG. 2, the compressed gas compressed by the third compression unit 3 is not sent into the cylinder head 4a of the fourth compression unit 4 but is provided in the fourth compressor 4 by the pipe line P3. Into the discharge section 8.
[0015]
The discharge portion 8 and the cylinder head 4a are disposed adjacent to each other, and the air passage 9 provided in the cylinder head 4a and the air passage 10 provided in the discharge portion 8 communicate with each other as shown in FIG. The compressed gas discharge path 4b compressed by the fourth compression section is joined, and the compressed gas introduction path 8a from the third compression section 3 fed by the pipe line P3 is joined to the ventilation path 10. Further, the end of the air passage 9 is connected to a pipe line where the pipe lines P1 and P2 merge.
[0016]
Since the pipe line P3 in the present invention is connected to the discharge unit 8 as described above, the first compression unit 1 and the second compression unit in which the compressed gas compressed by the third compression unit 3 is fed into the cylinder head 4a. There is no direct merge with the compressed gas compressed in the part. Therefore, the pressure of the compressed gas in the cylinder head 4a is lower than that in the prior art.
[0017]
FIG. 4 is a graph in which the pressure waveform in the cylinder of the fourth compression section 4 is measured. Comparing the peak pressure during compression by the piston, it was about 0.64 MPa in the prior art, but about 0.00 in the present invention. 6 MPa, and the pressure could be reduced by about 0.04 MPa.
[0018]
As described above, it is considered that the pressure in the air passage 9 of the cylinder head 4a is smaller than before, that is, the pressure on the back pressure side is small, so that the compressed gas can be easily discharged from the fourth compression section 4. As a result, overcompression in the fourth compression portion 4 is prevented, and the piston ring can be protected from early wear.
[0019]
The compressed gas merged in the air passage 9 of the cylinder head 4a is further merged with the compressed gas from the third compression section 3 in the air passage 10 of the discharge section 8, and then discharged from the discharge port 8b of the discharge section 8 to the outside. Discharged. A discharge pipe 11 (FIG. 1) is connected to the discharge port 8b.
[0020]
In this case, the same configuration is adopted for each compression section, and the first compression section 1 and the second compression will be described before and after the piston 13 reciprocating in the cylinder 12 as an example. The chamber 15 is formed and is configured to be compressed twice in one cylinder 12. Each compression unit is not limited to this, and there may be a configuration in which only the first compression unit 1 is subjected to double compression and the other compression units are not subjected to double compression.
[0021]
As shown in FIG. 5, an upper valve mechanism is provided at the upper part of the cylinder 12, and this upper valve mechanism is provided with a plurality of suction ports 16a at equal intervals in the circumferential direction on a disc-shaped valve seat 16. A concave portion is provided in the valve seat holding member 17, and a valve 19 is provided in the concave portion via a conical spring 18, and the suction port 16 a is grounded to the valve seat 16 by the urging force of the conical spring 18. Closed. Further, the valve seat holding member 17 is provided with a plurality of discharge ports 17a at equal intervals in the circumferential direction, and further provided with communication holes 17b so as to communicate with the suction port 16a when the valve 19 is opened. Has been.
[0022]
In addition, a lower valve mechanism is provided at the lower part of the cylinder 12, and the lower valve mechanism is provided with a plurality of suction ports 26a at equal intervals in the circumferential direction on a disc-shaped valve seat 26, similarly to the upper valve mechanism. A concave portion is provided in the valve seat holding member 27, and a valve 29 is provided in the concave portion via a conical spring 28. The urging force of the conical spring 28 contacts the valve seat 26 to connect the suction port 26a. Closed. Further, the valve seat holding member 27 is provided with a plurality of discharge ports 27a at equal intervals in the circumferential direction, and further provided with a communication hole 27b so as to communicate with the suction port 26a when the valve 29 is opened. Has been.
[0023]
The piston 13 is also provided with a valve mechanism. In the piston valve mechanism, a plurality of suction ports 36a are provided at equal intervals in the circumferential direction in a valve seat 36 that also serves as a piston body. A concave portion is provided in the pressing member 37, and a valve 39 is provided in the concave portion via a conical spring 38. The suction port 36a is closed by grounding the valve seat 36 by the urging force of the conical spring 38. Further, the valve seat holding member 37 is provided with a plurality of discharge ports 37a at equal intervals in the circumferential direction, and further provided with communication holes 37b so as to communicate with the suction port 36a when the valve 39 is opened. Has been.
[0024]
In the first compression section 1 configured as described above, when the piston 13 moves to the top dead center side, the valve 29 opens, gas flows into the first compression chamber 14, and the piston 13 moves to the bottom dead center side. The gas in the first compression chamber 14 is compressed to a predetermined pressure, and the compressed gas opens the valve 39 and flows into the second compression chamber 15. When the piston 13 moves again to the top dead center side, the compressed gas in the second compression chamber 15 is compressed to a high pressure, and when reaching a predetermined pressure, the valve 19 is opened and discharged to the discharge path 1b of the cylinder head 1a. This high-pressure compressed gas flows into the pipe line P1. Further, when the piston 13 moves again to the top dead center side, gas flows into the first compression chamber 14. Such double compression operation is repeated. The same applies to the second compression unit 2 to the fourth compression unit 4.
[0025]
In the above embodiment, an example of a four-cylinder one-stage compressor has been described. However, the present invention is not limited to this, and can be sufficiently applied to other multi-cylinder one-stage compressors.
[0026]
【The invention's effect】
As described above, according to the invention of claim 1, comprising a plurality of compressed portions, with Komu feeding compressed gas compressed by the compression unit to the cylinder head of the specific compression unit, compressed by the specific compression unit In the multi-cylinder single-stage compressor configured to discharge and join the compressed gas to the cylinder head and discharge from the discharge unit of the specific compression unit, at least one of the compression units excluding the specific compression unit The compressed gas compressed by one compression section is sent to the discharge section of the specific compression section without being sent to the cylinder head of the specific compression section, thus preventing over-compression in the specific compression section, and It has the effect of preventing wear and improving durability.
[0027]
According to a second aspect of the present invention, the multi-cylinder one-stage compressor according to the first aspect is a four-cylinder one-stage compressor, and the specific compressor is a fourth compression section, and is compressed by the first compression section. The compressed gas and the compressed gas compressed by the second compression unit are merged and fed into the cylinder head of the fourth compression unit, and the compressed gas compressed by the fourth compression unit is discharged to the cylinder head and merged. The compressed gas compressed by the third compressor is not sent to the cylinder head of the fourth compression unit , but is sent into the discharge unit disposed adjacent to the cylinder head, and the compressed gas and the compressed gas merged in the cylinder head Since the gas is combined and discharged from the discharge portion, it is possible to prevent over-compression in the fourth compression portion, prevent early wear of the piston ring, and improve durability.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing an embodiment in which the present invention is applied to a four-cylinder one-stage compressor.
FIG. 2 is an external perspective view of a four-cylinder single-stage compressor according to the present invention.
FIG. 3 is a schematic explanatory diagram illustrating a head cylinder and a discharge unit of a fourth compression unit.
FIG. 4 is a graph showing the pressure in the cylinder of the fourth compression unit due to a change in piping shape.
FIG. 5 is a schematic cross-sectional view showing a compression section (first compression section).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... 1st compression part 2 ... 2nd compression part 3 ... 3rd compression part 4 ... 4th compression part 4a ... Cylinder head 4b ... Discharge path 5, 6 ... Yoke 7 ... Crankshaft 8 ... Discharge part 8a ... Introduction path 9 10 ... Ventilation path 11 ... Discharge pipe

Claims (2)

Comprising a plurality of compressed portions, with Komu feeding compressed gas compressed by the compression unit to the cylinder head of the specific compression unit, the compressed gas compressed by the specific compression unit is combined with the discharge in the cylinder head, the In the multi-cylinder single-stage compressor configured to discharge from the discharge unit of the specific compression unit, the compressed gas compressed by at least one compression unit among the compression units excluding the specific compression unit is the specific compression unit. A multi-cylinder one-stage compressor that feeds into the discharge section of the specific compression section without feeding into the cylinder head . The multi-cylinder one-stage compressor is a four-cylinder one-stage compressor, and the specific compressor is a fourth compression unit, and a compressed gas compressed by the first compression unit, a compressed gas compressed by the second compression unit, And the compressed gas compressed by the fourth compressor is discharged into the cylinder head and merged, and the compressed gas compressed by the third compressor is the fourth compressor. Without being sent to the cylinder head of the compression unit , it is fed into a discharge unit disposed adjacent to the cylinder head, and this compressed gas and the compressed gas merged in the cylinder head are merged and discharged from the discharge unit. The multi-cylinder single-stage compressor according to claim 1.

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