JP3235977U - Two-stage compression type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, for example, a two-stage compression type compressor capable of exhibiting the same performance as a three-stage compression type by improving the configuration of an on-off valve installed in a cylinder of each stage.
SOLUTION: A crankcase 3, a drive motor mounted on the outside of the crankcase, a crank shaft 9 installed in the crankcase and rotated by the drive motor, and a low pressure side connected to the crank shaft. The low-pressure cylinder 31 and the high-pressure cylinder 33 connected to the connecting rod 51 and the high-pressure side connecting rod 57, the low-pressure cylinder 31 and the high-pressure cylinder 33 connected to the crankcase, and the low-pressure cylinder and the high-pressure cylinder connected to each of the low-pressure side connecting rod and the high-pressure side connecting rod, respectively. A low-pressure piston 47 and a high-pressure piston 53 that reciprocate, and slit lead type on-off valves 39 and 45 that open and close the gas inlet / outlet of the low-pressure cylinder and the high-pressure cylinder.
[Selection diagram] Fig. 1

Description

The present invention relates to a two-stage compression type compressor, and in particular, by improving the configuration of the on-off valve installed in each stage cylinder, even if it is a two-stage compression type, it is equivalent to, for example, a three-stage compression type. It is related to those devised so that the performance of the above can be exhibited, thereby reducing the number of parts, simplifying the configuration, downsizing, and reducing the processing man-hours and the assembly man-hours.

For example, in order to suppress heat generation and save energy in medium-sized and large-sized compressors, a three-stage compression type or more multi-stage compression type compressor has been used instead of a two-stage compression type. This is to suppress the compression ratio of each stage and suppress heat generation.
For example, Patent Document 1, Patent Document 2, and the like disclose the configuration of this type of compressor.

Japanese Unexamined Patent Publication No. 2007-263245 Japanese Unexamined Patent Publication No. 2002-303266

According to the above-mentioned conventional configuration, there are the following problems.
That is, in the case of a multi-stage compressor with three-stage compression or more than a two-stage compression type compressor, as a matter of course, the number of parts is large, the configuration is complicated and large, and the processing man-hours and assembly man-hours are high. There was a problem that it would increase.

The present invention has been made based on such a point, and the purpose thereof is that even a two-stage compression type can exhibit the same performance as, for example, a three-stage compression type. It is an object of the present invention to provide a two-stage compression type compressor capable of reducing the number of parts, simplifying the configuration, downsizing, and reducing the processing man-hours and the assembly man-hours.

In order to achieve the above object, the two-stage compression type compressor according to claim 1 of the present invention is rotated by a crankcase, a drive motor mounted on the outside of the crankcase, and a drive motor installed in the crankcase. Crank shaft, low-pressure side articulated rod and high-pressure side articulated rod connected to the crank shaft, low-pressure cylinder and high-pressure cylinder connected to the crankcase, and low-pressure side articulated rod and high-pressure side articulated rod, respectively. A low-pressure piston and a high-pressure piston that are connected and reciprocate in the low-pressure cylinder and the high-pressure cylinder, and a low-pressure slit / lead type on-off valve and a high-pressure slit / lead-type on-off valve that open and close the gas inlet / outlet of the low-pressure cylinder and the high-pressure cylinder. It is characterized by having it.
Further, the two-stage compression type compressor according to claim 2 is the two-stage compression type compressor according to claim 1, and the low-pressure slit / lead type on-off valve and the high-pressure slit / lead type on-off valve are the valve seat and the valve seat. It is characterized in that it is composed of a valve receiver that faces and is arranged on the surface of the valve and a valve body that is inserted between the valve seat and the valve receiver.
The two-stage compression type compressor according to claim 3 is the two-stage compression type compressor according to claim 2, wherein the valve seat has a plate-shaped member, a suction hole drilled in the plate-shaped member, and the plate-shaped member. The valve is composed of a slit-shaped discharge hole drilled in the member, and the valve is punched in the plate-shaped member, the slit-shaped suction hole drilled in the plate-shaped member, and the plate-shaped member. The valve body is composed of a slit-shaped member, a suction-side lead valve portion provided on the thin plate-shaped member to open and close the suction hole of the valve seat, and a suction-side lead valve portion. A slit-shaped suction port provided around the above, a discharge-side lead valve portion provided on the thin plate-shaped member to open and close the discharge hole of the valve receiver, and a slit-shaped portion provided around the discharge-side lead valve portion. It is characterized by having a discharge hole of the above.
Further, in the two-stage compression type compressor according to claim 4, in the two-stage compression type compressor according to claim 3, the discharge side lead valve portion of the valve body is seated on the valve body side of the discharge hole of the valve seat. It is characterized in that an inclined surface is provided, and an inclined surface on which the suction side lead valve portion of the valve body is seated is provided on the valve body side of the suction hole of the valve receiver.

As described above, according to the two-stage compression type compressor according to claim 1 of the present invention, the crankcase, the drive motor mounted on the outside of the crankcase, and the drive motor installed in the crankcase and rotated by the drive motor. Crank shaft, low pressure side connecting rod and high pressure side connecting rod connected to the crank shaft, low pressure cylinder and high pressure cylinder connected to the crankcase, and the low pressure side connecting rod and high pressure side connecting rod, respectively. A low-pressure piston and a high-pressure piston that are connected and reciprocate in the low-pressure cylinder and the high-pressure cylinder, and a low-pressure slit / lead-type on-off valve and a high-pressure slit / lead-type on-off valve that open and close the gas inlet / outlet of the low-pressure cylinder and the high-pressure cylinder. Since it is equipped, the two actions of reducing the volume of air on the low pressure stage side by making it a two-stage compression type and expanding the flow path area at the air inlet / outlet part by adopting a slit lead type on-off valve are combined. The flow velocity of the flowing air can be reduced to reduce the flow resistance and the pressure loss can be reduced. As a result, despite the two-stage compression type, the performance equivalent to, for example, the three-stage compression type can be exhibited. As a result, the number of parts can be reduced, the configuration can be simplified, the size can be reduced, and the number of processing and assembling steps can be reduced.
Further, according to the two-stage compression type compressor according to claim 2, in the two-stage compression type compressor according to claim 1, the low-pressure slit / lead type on-off valve and the high-pressure slit / lead type on-off valve are the valve seat and the above-mentioned valve. Since it is composed of a valve holder facing and arranged on the seat and a valve body inserted between the valve seat and the valve holder, high performance can be ensured by a simple configuration.
Further, according to the two-stage compression type compressor according to claim 3, in the two-stage compression type compressor according to claim 2, the valve seat has a plate-shaped member, a suction hole formed in the plate-shaped member, and the plate. It is composed of a slit-shaped discharge hole drilled in the shaped member, and the valve is a plate-shaped member, a slit-shaped suction hole drilled in the plate-shaped member, and a drilled hole in the plate-shaped member. The valve body is composed of a thin plate-shaped member, a suction-side lead valve portion provided on the thin plate-shaped member to open and close the suction hole of the valve seat, and a suction-side lead valve. A slit-shaped suction port provided around the portion, a discharge-side lead valve portion provided on the thin plate-shaped member to open and close the discharge hole of the valve receiver, and a slit provided around the discharge-side lead valve portion. Since it is equipped with a shape-shaped discharge hole, high performance can be ensured by a simple configuration.
Further, according to the two-stage compression type compressor according to claim 4, in the two-stage compression type compressor according to claim 3, the discharge side lead valve portion of the valve body is seated on the valve body side of the discharge hole of the valve seat. Since an inclined surface is provided on the valve body side of the suction hole of the valve receiver and an inclined surface on which the suction side lead valve portion of the valve body is seated is provided, the suction lead valve portion and the suction lead valve portion are provided. It is possible to prevent excessive deformation of the discharge lead valve portion and ensure operation.

It is a figure which shows the 1st Embodiment of this invention, FIG. 1 (a) is the sectional view seen from the front side of the two-stage compression type compressor, FIG. It is a figure. 2A is a plan view of a low pressure slit lead type on-off valve, and FIG. 2B is a cross-sectional view taken along the line IIb-IIb of FIG. 2A. .. 3A is a plan view of a valve seat of a low-pressure slit lead type on-off valve, and FIG. 3B is a cross-sectional view taken along the line IIIb-IIIb of FIG. 3A. 3 (c) is a cross-sectional view taken along the line IIIc-IIIc of FIG. 3 (a), and FIG. 3 (d) is a view taken along the line IIId-IIId of FIG. 3 (b). It is a figure which shows the 1st Embodiment of this invention, FIG. 4 (a) is a plan view of the valve receiver of a low pressure slit lead type on-off valve, FIG. 4 (b) is a cross section of IVb-IVb of FIG. 4 (a). It is a figure. It is a figure which shows the 1st Embodiment of this invention, and is the top view of the valve body of a low pressure slit lead type on-off valve. It is a figure which shows the 1st Embodiment of this invention, and FIG. 6 (a) is a cross-sectional view of the vicinity of a low pressure slit lead type on-off valve of a two-stage compression type compressor, and shows a state in which air flows into a low pressure cylinder. FIG. 6 (b) is a cross-sectional view of the vicinity of a low-pressure slit / lead-type on-off valve of a two-stage compression type compressor, showing a state in which air is discharged from a low-pressure cylinder. In the figure which shows the 2nd Embodiment of this invention, FIG. 7A is a sectional view seen from the front side of the two-stage compression type compressor, and FIG. 17B is a sectional view of VIIb-VIIb of 7th (a). It is a figure.

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, the two-stage compression type compressor 1 according to the first embodiment has a hollow crankcase 3. As shown in FIG. 1 (b), the crankshaft 9 is rotatably supported by bearings 5 and 7 in the crankcase 3. One end side of the crankshaft 9 (on the right side in FIG. 1B) is projected to the outside of the crankcase 3, and the crankshaft side pulley 11 is fixed to the crankcase 3. A cooling fan 13 is attached to the crank shaft side pulley 11.

There is a drive motor (not shown) outside the two-stage compression type compressor 1, and a drive motor side pulley (not shown) is fixed to the output shaft of the drive motor. A drive belt (not shown) is wound around the crank shaft side pulley 11 and the drive motor side pulley. As the drive motor rotates, the crank shaft 9 rotates via the drive motor side pulley, the drive belt, and the clamp shaft side pulley.

An eccentric portion 21 is eccentric and formed on the other end side of the crank shaft 9 (on the left side in FIG. 1B). A low-voltage side connecting eccentric shaft portion 23 is formed on the tip end side (center left side of FIG. 1 (b)) of the eccentric portion 21, and is formed on the proximal end side (center right side of FIG. 1 (b)) of the eccentric portion 21. Is formed with an eccentric shaft portion 25 for connecting on the high voltage side. The low-voltage side connecting eccentric shaft portion 23 and the high-voltage side connecting eccentric shaft portion 25 are arranged coaxially.

The crankcase 3 is equipped with a first-stage low-pressure cylinder mechanism 31 and a second-stage high-pressure cylinder mechanism 33. The low-pressure cylinder mechanism 31 includes a cylindrical low-pressure cylinder 35, a low-pressure cylinder cover 37 installed on the tip side (middle upper side of FIG. 1A) of the low-pressure cylinder 35, the low-pressure cylinder 35, and the low-pressure cylinder cover. It is composed of a low-pressure slit lead type on-off valve 39 inserted between the 37 and 37.
Similarly, the high-pressure cylinder mechanism 33 includes a tubular high-pressure cylinder 41, a high-pressure cylinder cover 43 installed on the tip side of the high-pressure cylinder 41 (on the right side in FIG. 1A), the high-pressure cylinder 41, and the high-pressure cylinder 41. It is composed of a high-pressure slit lead type on-off valve 45 inserted between the high-pressure cylinder cover 43 and the high-pressure cylinder cover 43.

A low-pressure piston 47 is reciprocally installed in the low-pressure cylinder 35 of the low-pressure cylinder mechanism 31. The low-pressure piston 47 is provided with a rotary shaft 49, and the low-pressure side eccentric shaft portion 23 of the crank shaft 9 and the rotary shaft 49 of the low-pressure piston 47 are connected by a low-pressure side connecting rod 51. Both ends of the low-pressure side connecting rod 51 are rotatably connected to the rotary shaft 49 of the low-pressure piston 47 and the low-pressure side connecting eccentric shaft portion 23 of the crank shaft 9.

Further, a high-pressure piston 53 is reciprocally installed in the high-pressure cylinder 41 of the high-pressure cylinder mechanism 33. The high-pressure piston 53 is provided with a rotary shaft 55, and the high-pressure side connecting eccentric shaft portion 25 of the crank shaft 9 and the rotary shaft 55 of the high-pressure piston 53 are connected by a high-pressure side connecting rod 57. Both ends of the high-pressure side connecting rod 57 are rotatably connected to the rotary shaft 55 of the high-pressure piston 53 and the high-pressure side connecting eccentric shaft portion 25 of the crank shaft 9.

When the crank shaft 9 is rotated, the low-pressure piston 47 reciprocates in the low-pressure cylinder 35, and the high-pressure piston 53 reciprocates in the high-pressure cylinder 41.

As shown in FIG. 2, the low-pressure slit / lead type on-off valve 39 includes a valve seat 61 which is a plate-shaped member, a valve receiver 63 which is a plate-shaped member installed under the valve seat 61, and the above. It is composed of a thin plate-shaped valve body 65 inserted between the valve seat 61 and the valve receiver 63.

For example, as shown in FIG. 3, the valve seat 61 is formed with three suction holes 67, 67, 67, respectively, at three locations. Further, a slit-shaped discharge hole 69 is formed in the valve seat 61. The discharge hole 69 is formed in a shape having a large flow path area as if it is branched into six by providing four seating portions 71, 71, 71, 71 protruding inside the rectangular through hole. As shown in FIGS. 3 (b), 3 (c), and 3 (d), the valve body 65 side of the four seating portions 71 (FIG. 3 (b) and FIG. 3 (c)). An inclined surface 73 is formed on each of the lower middle side).
Further, a rectangular seal accommodating recess 75 is formed on the counter valve body 65 side (front side in the direction of the middle paper surface in FIG. 3A) of the valve seat 61. Further, an annular seal accommodating recess 77 is formed on the outer peripheral side of the valve seat 61 on the reverse valve body 65 side (front side in the direction of the middle paper surface in FIG. 3A).

Further, for example, as shown in FIG. 4, four discharge holes 79, 79, 79, 79 are formed in the valve receiver 63.
Further, the valve receiver 63 is formed with one slit-shaped suction hole 81 at each of the three locations. The suction hole 81 is formed in a shape having a large flow path area as if it is branched into four by providing three seating portions 83, 83, 83 protruding inside the rectangular through hole. As shown in 4 (b), an inclined surface 85 is formed on the valve body 65 side (upper center of FIG. 4 (b)) of each of the seating portions 83.
Further, an annular seal accommodating recess 87 is formed on the outer peripheral side of the valve receiver 63 on the anti-valve body 65 side (middle and lower side in FIG. 4B).

Further, as shown in FIG. 5, the valve body 65 is formed with a slit-shaped discharge hole 91. The discharge hole 91 has a shape having a large flow path area as if it is branched into six by providing four discharge side reed valve portions 93, 93, 93, 93 protruding inside the rectangular through hole. It is formed.
Further, as shown in FIG. 5, the valve body 65 is formed with one slit-shaped suction hole 95 at each of three locations, and each of the suction holes 95 is 3 inside a rectangular through hole. The suction side reed valve portions 97, 97, 97 are provided so as to project so that the lead valve portions 97, 97, 97 are formed into a shape having a large flow path area as if they were branched into four.
The discharge-side reed valve portion 93 faces and is arranged on the lower side of the inclined surface 73 of the valve seat 61. The suction side reed valve portion 97 faces and is arranged on the upper side of the inclined surface 85 of the valve receiver 63.

As shown in FIG. 6, a seal member 99 is interposed between the low pressure cylinder cover 37 of the low pressure cylinder mechanism 31 and the seal accommodating recess 77 of the valve seat 61 of the low pressure slit lead type on-off valve 39. Further, a seal member 101 is interposed between the seal accommodating recess 75 of the valve seat 61 and the low pressure cylinder cover 37. Further, a seal member 103 is interposed between the seal accommodating recess 87 of the valve receiver 63 and the low pressure cylinder 35.

The inside of the low pressure cylinder cover 37 is divided into a suction side space 103 and a discharge side space 105. The suction side space 103 communicates with the inside of the low pressure cylinder 35 via the suction hole 67 of the valve seat 61, the suction hole 95 of the valve body 65, and the suction hole 81 of the valve receiver 63. Further, the discharge side space 105 communicates with the inside of the low pressure cylinder 35 via the discharge hole 69 of the valve seat 61, the discharge hole 91 of the valve body 65, and the discharge hole 79 of the valve receiver 63.

Further, the high-pressure slit / lead type on-off valve 45 has the same configuration as the low-pressure slit / lead-type on-off valve 39, and the suction-side space 107 and the discharge-side space 109 of the high-pressure cylinder cover 43 of the high-pressure cylinder mechanism 33 also have the same configuration. It communicates with the inside of the high pressure cylinder 41 in the same configuration as in the case of the low pressure cylinder mechanism 31.

Further, the discharge side space 105 of the low pressure cylinder cover 37 of the low pressure cylinder mechanism 31 and the suction side space 107 of the high pressure cylinder cover 43 of the high pressure cylinder mechanism 33 are connected by a pipe (not shown). Further, a heat exchanger (not shown) for cooling is inserted in the pipe. In the case of the present embodiment, for example, the outside air is guided to the low-pressure cylinder mechanism 31 to perform the first-stage low-pressure compression, which is guided to the high-pressure cylinder mechanism 33 via the pipe to perform the second-stage high-pressure compression. .. At that time, it is cooled by the above heat exchanger.

Next, the model configuration of the two-stage compression type compressor according to the present embodiment will be described. As described above, the basic configuration of the two-stage compression type compressor according to the present embodiment is a crankcase 3, a low-pressure cylinder mechanism 31, a high-pressure cylinder mechanism 33, and a drive motor. The crankcase 3 is commonly referred to as a platform. In the case of this embodiment, this crankcase 3 is common to all models. Further, four types of low-pressure cylinder mechanism 31 and high-pressure cylinder mechanism 33 are prepared depending on the cylinder diameter. Furthermore, three types of drive motors with different outputs are available. For the above common crankcase 3, a low-pressure cylinder mechanism 31 and a high-pressure cylinder mechanism 33 having an arbitrary cylinder diameter can be combined from four types of cylinder diameters, and an arbitrary drive motor can be selected from the three types of drive motors. Therefore, three models are configured.

Next, the operation by this first embodiment will be described.
When the crank shaft 9 is rotated by the drive motor, the low-pressure piston 47 reciprocates in the low-pressure cylinder 35 of the low-pressure cylinder mechanism 31, and the high-pressure piston 53 reciprocates in the high-pressure cylinder 41 of the high-pressure cylinder mechanism 33.
At this time, when the low pressure piston 47 is moved to the low pressure cylinder cover 37 side (middle upper side of FIG. 1A) of the low pressure cylinder mechanism 31, the high pressure piston 53 moves to the anti-high pressure cylinder cover 43 of the high pressure cylinder mechanism 33. When the low-pressure piston 47 is moved to the side (left side in FIG. 1A) and the low-pressure piston 47 is moved to the anti-low-pressure cylinder cover 37 side (lower middle side in FIG. 1A) of the low-pressure cylinder mechanism 31, the high-pressure piston 53 operates so as to be moved to the high-pressure cylinder cover 43 side (right side in FIG. 1A) of the high-pressure cylinder mechanism 33.

When the low-pressure piston 47 is moved to the anti-low-pressure cylinder cover 37 side (middle and lower side in FIG. 1A) of the low-pressure cylinder mechanism 31, as shown in FIG. 6A, the low-pressure cylinder mechanism 31 is used from the outside. The suction side space 103 of the low pressure cylinder cover 37, the suction hole 67 of the valve seat 61 of the slit / lead type on-off valve 39, the suction hole 95 of the valve body 65 of the slit / lead type on-off valve 39, and the slit / lead type on / off. Air flows into the low-pressure cylinder 35 through the suction hole 81 of the valve receiver 63 of the valve 39. At this time, the suction side reed valve portion 97 of the valve body 65 is curved and deformed to the lower middle side in FIG. 6A, whereby the air flows in from the suction side space 103 into the low pressure cylinder 35. The route is secured. Further, at this time, the deformed suction side reed valve portion 97 is applied to the inclined surface 85 of the valve receiver 63 and is not further deformed.

At this time, the low-pressure cylinder 35 is passed through the discharge hole 69 of the valve seat 61, the discharge hole 91 of the valve body 65, and the discharge hole 79 of the valve receiver 63 from the discharge side space 105 of the low-pressure cylinder cover 37. Although air tries to flow back into the valve body 65, the discharge side lead valve portion 93 of the valve body 65 abuts on the valve receiver 63 and does not deform, and the discharge hole 79 of the valve receiver 63 is closed, so that the discharge side space is reached. Air does not flow back from 105 into the low pressure cylinder 35.

When the low-pressure piston 47 is moved to the low-pressure cylinder cover 37 side (upper middle of FIG. 1A) of the low-pressure cylinder mechanism 31, as shown in FIG. 6B, the valve receiver is received from inside the low-pressure cylinder 35. Air moves into the discharge side space 105 of the low pressure cylinder cover 37 through the discharge hole 79 of 63, the discharge hole 91 of the valve body 65, and the discharge hole 69 of the valve seat 61. At this time, the discharge side reed valve portion 93 of the valve body 65 is curved upward in FIG. 6A and deformed, whereby the air flows from the low pressure cylinder 35 into the discharge side space 105. The route is secured. Further, at this time, the deformed discharge-side reed valve portion 93 is applied to the inclined surface 73 of the valve seat 61 and is not further deformed.

At this time, the suction side space 103 of the low pressure cylinder cover 37 is passed through the suction hole 81 of the valve receiver 63, the suction hole 95 of the valve body 65, and the suction hole 67 of the valve seat 61 from inside the low pressure cylinder 35. Although air tries to flow back inside, the suction side lead valve portion 97 of the valve body 65 abuts on the valve seat 61 and does not deform, and closes the suction hole 67 of the valve seat 61, and the manual pressure cylinder. Air does not flow back from the inside of 35 to the suction side space 103.
As described above, the air does not flow backward and moves one-way from the suction side space 103 to the discharge side space 105 side.

Similarly, in the high-pressure cylinder mechanism 33, air is similarly moved by the reciprocating movement of the high-pressure piston 53 and the high-pressure slit lead type on-off valve 45. At this time, the air in the discharge side space 105 of the low pressure cylinder cover 37 of the low pressure cylinder mechanism 31 moves to the suction side space 107 of the high pressure cylinder cover 43 of the high pressure cylinder mechanism 33 via a pipe. As described above, the low-pressure slit / lead type on-off valve 39 and the high-pressure slit / lead-type on-off valve 45 prevent the backflow of air.

Next, the effect of this first embodiment will be described.
First, in the two-stage compression type compressor, by adopting the low-pressure slit / lead type on-off valve 39 and the high-pressure slit / lead type on-off valve 45, for example, it is equivalent to the three-stage compression type despite the two-stage compression type. Performance can be demonstrated. This point will be described in detail.
First, the difference between two-stage compression and three-stage compression will be described. For example, if you suck in the outside air at atmospheric pressure (1 atm) and try to compress it to 31 atm by three-stage compression, the first stage is about 3 atm, the second stage is about 9 atm, and the third stage is up to 31 atm. It will be compressed. On the other hand, in the case of two-stage compression, the first stage compresses to about 5.5 atm and the second stage compresses to 31 atm.
For example, comparing the first stage of three-stage compression and the first stage of two-stage compression, the two-stage compression is 5.5 atm higher than the three-stage compression in the case of three-stage compression, and the volume of air is correspondingly higher. It's getting smaller.
On the other hand, looking at the configurations of the low-pressure slit / lead-type on-off valve 39 and the high-pressure slit / lead-type on-off valve 45, at the portion where air is sucked, the valve body 65 is provided with a slit-shaped suction port 95 and a valve receiver. Similarly, in 63, a slit-shaped suction port 81 is provided to expand the flow path area. Similarly, at the portion where air is discharged, the valve body 65 is provided with a slit-shaped discharge hole 91, and the valve seat 61 is also provided with a slit-shaped discharge hole 69 to expand the flow path area. There is.
As the volume of the passing air becomes smaller and the flow path area is expanded, the flow velocity of the passing air becomes smaller, and as a result, the flow resistance becomes smaller and the pressure loss is reduced. This also applies to the second stage of the two-stage compression.
As a result, despite the two-stage compression type, it is possible to exhibit the same performance as, for example, the three-stage compression type.
In addition, heat generation is suppressed by reducing the pressure loss.
In addition, the reed type is adopted, and the discharge side reed valve portion 93 and the suction side reed valve portion 97 of the valve body 65 themselves are leaf springs and do not require a separate spring, so that they can be moved. The structure is smooth, has low sound, and has low resistance.
In addition, by adopting a two-stage compression type and adopting a low-pressure slit / lead type on-off valve 39 and a high-pressure slit / lead type on-off valve 45, the number of parts can be significantly reduced, and the processing man-hours and assembly man-hours can be reduced. It can be reduced.
Further, the low-pressure slit / lead type on-off valve 39 and the high-pressure slit / lead-type on-off valve 45 are a valve seat 61, a valve receiver 63 installed under the valve seat 61, and the valve seat 61 and the valve receiver. Since it is composed of a valve body 65 inserted between 63, high performance can be ensured by a simple configuration.

Further, the valve seat 61 is a plate-shaped member, and a suction hole 67 and a discharge hole 69 are formed. The valve receiver 63 is a plate-shaped member, and a discharge hole 79 and a suction hole 81 are formed. The body 65 is a thin plate-shaped member, and a discharge hole 91 is formed, a discharge side lead valve portion 93 is formed in the discharge hole 91, and a suction hole 95 is formed, and the suction hole 95 is formed. A suction side lead valve portion 97 is formed inside, and the discharge side lead valve portion 93 opens and closes the discharge hole 79, and the suction side lead valve portion 97 opens and closes the suction hole 67. Higher performance can be guaranteed.

Further, a seating portion 71 is provided in the discharge hole 69, and an inclined surface 73 is formed on the valve body 65 side (middle and lower sides of FIGS. 3B and 3C) of the seating portion 71. A seating portion 83 is provided in the suction hole 81, and an inclined surface 85 is formed on the valve body 65 side (middle upper side of FIG. 4B) of the seating portion 83. Since the discharge side lead valve portion 93 is arranged below the inclined surface 73 of the valve seat 61 and the suction side lead valve portion 97 is arranged above the inclined surface 85 of the valve receiver 63, the suction side Even if the lead valve portion 97 is deformed, it is in contact with the inclined surface 85 and is not further deformed, and even if the suction side lead valve portion 97 is deformed, it is in contact with the inclined surface 85 and further Since it does not deform, it is possible to prevent the suction reed valve portion 97 and the discharge reed valve portion from being excessively deformed and to ensure the operation.

In addition, because the pressure loss can be reduced, the discharge capacity range that can be covered by one model has become wider. As a result, it has become possible to reduce the number of models that are finely divided according to the discharge capacity range. At the same time, it has become possible to promote the standardization of parts. Specifically, it is now possible to cover with 3 models, while 8 models were required in the past.

Next, a second embodiment of the present invention will be described with reference to FIG. 7.
The two-stage compression type compressor 201 according to the second embodiment has the same configuration as the two-stage compression type compressor 1 according to the first embodiment, but has three low-pressure cylinder mechanisms 31 and the above three. The air discharged from the discharge side space 105 of the low pressure cylinder cover 37 of the low pressure cylinder mechanism 31 merges and is sent to the suction side space 107 of the high pressure cylinder cover 43 of the high pressure cylinder mechanism 33.

A crankshaft 205 is rotatably installed in the crankcase 203 via bearings 207 and 209, and the eccentric shaft portion 215 of the crankshaft 205 has a low pressure side connecting shaft portion 217 and a high pressure side connecting shaft. Part 219 is formed. One end side of three low pressure side connecting rods 51, 51, 51 is rotatably connected to the low pressure side connecting shaft portion 217.
Further, also in the case of the second embodiment, this crankcase is common to all models, and four types of low-pressure cylinder mechanism and high-pressure cylinder mechanism are prepared depending on the cylinder diameter. Furthermore, four types of drive motors with different outputs are available. By combining a low-pressure cylinder mechanism and a high-pressure cylinder mechanism with an arbitrary cylinder diameter from the four types of cylinder diameters for the above common crankcase, and selecting an arbitrary drive motor from the four types of drive motors, 4 I try to configure the model.
The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Also in the case of the second embodiment, the same effect as in the case of the first embodiment can be obtained.
Also in the case of this second embodiment, four models are sufficient, whereas eight models were conventionally required.

The present invention is not limited to the first embodiment and the second embodiment.
There may be various cases in the number of low-pressure cylinders and high-pressure cylinders, the number of suction holes and discharge holes, and the number of suction-side reed valve portions and discharge-side reed valve portions.
The illustrated configuration is just an example.

The present invention relates to a two-stage compression type compressor, and in particular, by improving the configuration of the on-off valve installed in each stage cylinder, it is possible to provide, for example, the same performance as the three-stage compression type. For example, it is suitable for a compressor for ships.

1 Two-stage compression type compressor 3 Crankcase 9 Crank shaft 31 Low-pressure cylinder mechanism 33 High-pressure cylinder mechanism 39 Low-pressure slit / lead type on-off valve 45 High-pressure slit / lead-type on-off valve 47 Low-pressure piston 51 Low-pressure side connecting rod 53 High-pressure piston 57 High-pressure side Connecting rod 61 Valve seat 63 Valve receiver 65 Valve body 67 Suction hole 69 Discharge hole 73 Slope 79 Discharge hole 81 Suction hole 85 Slope 91 Discharge hole 93 Discharge side lead valve part 97 Suction side lead valve part 201 Two-stage compression type compressor

Claims (4)

Crankcase and
With the drive motor mounted on the outside of the crankcase,
The crankshaft installed in the crankcase and rotated by the drive motor,
The low-pressure side connecting rod and high-pressure side connecting rod connected to the crank shaft,
The low-pressure cylinder and high-pressure cylinder connected to the crankcase,
A low-pressure piston and a high-pressure piston that are connected to the low-pressure side connecting rod and the high-pressure side connecting rod and reciprocate in the low-pressure cylinder and the high-pressure cylinder, respectively.
A low-pressure slit / lead type on-off valve and a high-pressure slit / lead-type on-off valve that open and close the gas inlet / outlet of the low-pressure cylinder and high-pressure cylinder.
A two-stage compression type compressor characterized by being equipped with. In the two-stage compression type compressor according to claim 1,
The low-pressure slit / lead-type on-off valve and the high-pressure slit / lead-type on-off valve are a valve seat, a valve receiver facing / arranged on the valve seat, and a valve inserted between the valve seat and the valve receiver. A two-stage compression type compressor characterized by being composed of a body and. In the two-stage compression type compressor according to claim 2.
The valve seat is composed of a plate-shaped member, a suction hole drilled in the plate-shaped member, and a slit-shaped discharge hole drilled in the plate-shaped member.
The valve is composed of a plate-shaped member, a slit-shaped suction hole drilled in the plate-shaped member, and a discharge hole drilled in the plate-shaped member.
The valve body has a thin plate-shaped member, a suction-side lead valve portion provided on the thin plate-shaped member to open and close the suction hole of the valve seat, and a slit-shaped suction port provided around the suction-side lead valve portion. A discharge side lead valve portion provided on the thin plate-shaped member to open and close the discharge hole of the valve receiver, and a slit-shaped discharge hole provided around the discharge side lead valve portion.
A two-stage compression type compressor characterized by being equipped with. In the two-stage compression type compressor according to claim 3,
An inclined surface on which the discharge side reed valve portion of the valve body is seated is provided on the valve body side of the discharge hole of the valve seat.
A two-stage compression type compressor characterized in that an inclined surface on which the suction side reed valve portion of the valve body is seated is provided on the valve body side of the suction hole of the valve receiver.

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