KR20150141870A - Multi-follower rotary compressor and sectional-compressing method for the same - Google Patents

Abstract

A multi-follower compressor includes a cylinder block, a cam, a plurality of followers, and at least one connection rod. The cylinder block has a compression room, a plurality of intake channels, a plurality of exhaust channels, and a plurality of storage rooms, each of which is connected to the compression room and the outside of the cylinder block spatially. And a clockwise pattern arranging one intake channel, one storage room and one exhaust channel is applied. The cam in the compression room combines driving shafts by sleeves. Each follower accommodated in the storage room has one end coming in contact with the cam and the other end moving in an axial direction following the storage room. The connection rod having both ends combined to different followers is displaced together with the combined follower. The followers connected to the connection rod are arranged in parallel on the same axis.

Description

[0001] MULTI-FOLLOWER ROTARY COMPRESSOR AND SECTIONAL-COMPRESSING METHOD FOR THE SAME [0002]

This application claims priority based on Taiwan (International) Application No. 103120051, filed on June 10, 2014, the disclosure of which is incorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sectional-compressing method for a multi-follower compressor and a multi-wall compressor, and more particularly, To a rotary compressor having a symmetrical follower employing an exhaust method to reduce power consumption, minimize mechanical wear, and extend operating life.

Compressors are essential equipment for air conditioning systems, such as air conditioners. In particular, thanks to the development of precision machines, a myriad of excellent rotary compressors have been widely applied to small or mini compression devices. Generally, most of the miniature or mini rotary compressors are rolling rotor compressors. The rolling rotor compressor has the following features:

(1) simple configuration with fewer components;

(2) reliable operation with relatively weak components;

(3) no suction valve, low backlash volume, relatively high capacity factor;

(4) Among various compressors under the same freezing capacity, there are fewer volumetric occupancy, light weight, balanced operation;

(5) low noise level during operation and low noise level; And

(6) Meets high demand in machine precision

Referring now to Figure 1, the structure of a conventional rotary rolling rotor compressor is schematically illustrated. In this compressor, the cylinder block 3 having a circular cross section includes a compression chamber 9, an intake channel 7 and an exhaust channel 5, wherein the intake channel 7 and the exhaust channel 5 Are individually communicated in the space in which the compression chamber (9) is located. In order to prevent the reflection flow of compressed steam during operation, an exhaust valve (6) is included in the exhaust channel (5), thereby selectively sealing the channel (5). As shown in the figure, the center line of the cylinder block 3 is on the same line as the axis of the compressor. The drive shaft 2 extending along the axis and located in the compression chamber 9 is rotationally driven by an external motor (not shown). A sleeve cam 1 made of a steel shell is sleeve-coupled to the drive shaft 2. In this technical field, the combination of the drive shaft 2 and the sleeve cam 1 is called a rotor (hereinafter referred to as a rotor). The rotor is brought into dynamic contact with the inner wall of the cylinder block 3. The rotor rotates in the cylinder block 3 to dynamically closely contact the compression chamber 9 to form a moving space having a crescent-shaped cross section. The cylinder block 3 further has a containing chamber G positioned between the intake channel 7 and the exhaust channel 5. [ The housing chamber G is for receiving a follower 4 having one end thereof in contact with the outer wall of the sleeve cam 1 and the other end thereof being coupled to the spring means 8. Here, It is possible to perform reciprocating linear motion with respect to the object G.

Referring to Figures 2 (a) - (d), the respective stages of operation of the conventional rotary rolling rotor compressor of Figure 1 are illustrated. As the shaft is driven and the rotor rolls along the inner wall of the cylinder block 3, the crescent-shaped compression chamber 9 is displaced while maintaining its shape and volume. By allowing the spring means 8 to apply a constant spring force, one end (lower end) of the follower 4 can maintain contact with the rotor, whereby the compression chamber 9 can be divided into two compression chambers, It is an intake chamber arranged to communicate with a space having an intake channel (7) and an exhaust chamber arranged to communicate with a space having an exhaust channel (5). While the rotor is rolling in the counterclockwise direction, the volume of the intake chamber gradually increases to reduce the pressure to form a vacuum chamber for introducing air. At the same time, the volume of the exhaust chamber gradually decreases to compress the internal air to form a high-pressure chamber for opening the exhaust valve 6, and to discharge the air through the exhaust channel 5 Export. This operation pattern of air introduction, compression, and air release can be made periodically by repeatedly generating a considerably large pressure difference between the high-pressure chamber and the vacuum chamber inside the compression chamber 9. [ However, it is inevitable to increase the torque and power output in the motor for driving the rotor following the above-described operation pattern.

3 (a) - (c), the abnormal operation of the rotary rolling rotor compressor of FIG. 1 is schematically illustrated. In order for a considerably large pressure difference to be generated within the operating pattern of the above-mentioned compressor, the follower 4 to withstand this pressure difference is tilted by the lateral force F. This lateral force F can be calculated by multiplying this pressure difference by the action area of the follower 4. As the pressure difference increases, this lateral force F also increases proportionally. A reaction force is formed on the opposite side of the follower 4 in the containing chamber G while the lateral force F acts on the follower 4. [ The reaction force on the follower 4 hinders the reciprocating movement of the follower 4. The friction between the follower 4 and the sleeve cam 1 becomes remarkable after the operation for a long period of time and thus the temporary gap formed by the accidental separation of the follower 4 and the sleeve cam 1, Leaked, attainable internal pressure is reduced, product life is shortened, and operating efficiency is lowered. Further, noise is generated while the separated follower 4 is brought into contact again with the sleeve cam 1 by the spring force of the spring means 5. [ In addition, the lateral force F on the follower 4 can accelerate the fatigue of the spring means 8. [ As a result, as the compressor continues to operate, the cycle of separation between the follower 4 and the sleeve cam 1 is increased, the air leakage becomes serious, and the noise becomes larger and more frequent. Therefore, the operating life of the compressor and the working efficiency are greatly deteriorated.

Accordingly, it is a primary object of the present invention to provide a multi-way compressor and a divisional compression method therefor, wherein the divisional compression and the divisional exhaust are applied to the operating cycle of the rotor, effectively reducing the power output of the motor .

The multi-way compressor includes:

Hollow cylinder block. Comprising: a compression chamber, a plurality of intake channels, a plurality of exhaust channels, and a plurality of accommodation chambers; One intake chamber, one intake chamber, and one exhaust channel are repeatedly applied in a sequential arrangement in a clockwise arrangement pattern around the cylinder block, whereby the plurality of intake channels, the plurality of accommodating chambers, Channel; Wherein each of the plurality of intake channels, the plurality of accommodating chambers, and the plurality of exhaust channels are spatially communicated between the compression chamber and the outside of the cylinder block; Each of said plurality of exhaust channels having a valve therein for sealing a corresponding exhaust channel;

Sleeve cam. Wherein a portion of the outer circumferential wall of the sleeve cam is in contact with an inner wall of the cylinder block and is sleeve-coupled to a drive shaft whose one end is coupled to the outer motor;

Multiple followers. This is achieved by the fact that each of the followers is fitted in one of the corresponding plurality of accommodating chambers, one end of the follower contacts the other end of the outer peripheral wall of the sleeve cam, To perform an axial movement along the containing chamber; And

At least one connecting rod. Wherein the connecting rod is disposed outside the cylinder block in a noncontact state, one end of the connecting rod is coupled to the other end of the corresponding follower, and the other end of the connecting rod is connected to the other one of the followers And is coupled to the other end.

In one embodiment of the present invention, the connection rod coupled to the follower is moved in accordance with the axial movement of the corresponding follower, and the followers coupled to the connection rod are parallel to the same axial line . The plurality of intake channels, the plurality of exhaust channels, the plurality of accommodating chambers, and the plurality of followers all have the same quantity.

In the present invention, the division compressing method for a multi-way compressor includes at least one of a first stage intake-first compression-first stage exhaust-second stage intake-second compression-second stage exhaust in an operation cycle Can be provided. By changing the prior art to have a single follower and a spring for the elastic movement of the follower, the rotor of the multi-way compressor according to the present invention can form a plurality of split compression and split exhaust during an operating cycle, The output power of the motor is reduced and the lateral force F is evenly distributed to the follower so that the abnormal operation described in the background section can be remarkably minimized and thus both the service life and the operating efficiency can be significantly improved have.

Other areas of application of the present invention will become more apparent from the following detailed description. It should be noted, however, that the detailed description and specific embodiments have been presented by way of illustration only, with specific reference being made to the description of the invention disclosure. Various modifications and improvements within the spirit and scope of this disclosure will become apparent to those skilled in the art from this detailed description.

According to the present invention, in accordance with the multi-way compressor and the divisional compression method therefor, the divisional compression and the divisional exhaust are applied to the operation cycle of the rotor, thereby effectively reducing the power output of the motor.

The disclosure of the present invention will be better understood from the following detailed description and the accompanying drawings, which are given for the purpose of illustration only and are not intended to limit the disclosure of the present invention, wherein:
1 is a schematic view of a conventional rotary rolling rotor compressor;
Figures 2 (a) - (d) schematically illustrate each of the operation stages of Figure 1;
Figures 3 (a) to 3 (c) schematically illustrate the abnormal operation of Figure 1;
4 is a schematic view of a first embodiment of a multi-way compressor according to the present invention;
Figures 5 (a) - (d) schematically illustrate each of the operation stages of Figure 4;
6 is a schematic diagram of a second embodiment of a multi-way compressor according to the present invention;
Figures 7 (a) to 7 (d) schematically illustrate the respective operation stages of Figure 6.

In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, it will be apparent that some embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown schematically for simplicity of illustration.

In the present invention, the multi-way compressor and the divisional compression method for the multi-way compressor apply a symmetrical follower to the rotary compressor, and use the intake-compression-exhaust air to reduce the output power of the motor and the wear of the compressor A dividing operation pattern is also introduced to increase the operating life of the compressor and reduce its noise.

Referring to Figure 4, a schematic diagram of a first embodiment of a multi-way compressor in accordance with the present invention is shown. This multi-way compressor is mainly applied to a rotary compressor. The first follower 41, the second follower 42 and the connecting rod 40. The first follower 41 and the second follower 42 are connected to each other through the hollow cylinder block 30, the sleeve cam 10, the drive shaft 20, And one end of the connecting rod 80 is coupled to the first follower 41 and the other end is coupled to the second follower 42. [

The cylinder block 30 may have a cross-section (but not limited to) a circle, a rectangle, a polygon, or the like. In this embodiment, a circular cross section is applied. As shown in the figure, the circular hollow space of the cylinder block 30 is defined as a compression chamber 90. The cylinder block 30 includes a first intake channel 71, a second intake channel 72 disposed opposite the first intake channel 71, a first exhaust channel 51, And a second exhaust channel (52) disposed opposite to the second exhaust channel (51). The first accommodation chamber G1 is disposed between the first intake channel 71 and the second exhaust channel 52 and the second accommodation chamber G2 is disposed between the second intake channel 72 and the first exhaust chamber 72. [ And is disposed between the channels 51. The first exhaust valve 61 and the second exhaust valve 62 are provided in the first exhaust channel 51 and the second exhaust channel 52, respectively.

The first intake channel 71, the second intake channel 72, the first exhaust channel 51, the second exhaust channel 52, the first storage chamber G1, and the second storage chamber G2 are individually One end communicates with the space including the compression chamber 90 and the other end communicates with the outside of the cylinder block 30. [ The first exhaust valve 61 and the second exhaust valve 62 are both in the closed state while the internal pressure of the compression chamber 90 is smaller than the combined pressure value of the external pressure of the cylinder block 30 and the predetermined pressure difference , Any flow between the compression chamber (90) and the outside of the cylinder block (30) is blocked.

The sleeve cam (10) provided in the compression chamber (90) has an outer peripheral wall portion in contact with the inner wall of the cylinder block (30). The drive shaft 20, which is disposed inside the sleeve cam 10 and drives the sleeve cam 10 to rotate around itself, has one end extending to engage with an external motor (not shown). In this technique, the combination of the drive shaft 20 and the sleeve cam 10 is defined as a rotor. The motor driving the drive shaft 20 and hence the sleeve cam 10 (i.e., the rotor) may be a pole-change motor. The rotor can be driven to roll at a variable speed along the inner wall of the cylinder block 30. [ In the present invention, the number of poles of the motor depends on actual demand.

The first follower 41 and the second follower 42 are individually accommodated in the first accommodation chamber G1 and the second accommodation chamber G2, respectively. Each of the first follower 41 and the second follower 42 has one end making contact with the outer wall of the sleeve cam 10 and the other end being coupled to the connecting rod 80. The end of the follower 41 or 42 may be a round tip in contact with the sleeve cam 10 and the other end may be fixed to the connecting rod 80 by screwing, The first follower 41 and the second follower 42 project in the axial direction with respect to the first containing chamber G1 and the second containing chamber G2, respectively. Due to the first follower 41 and the second follower 42 protruding into the compression chamber 90 and contacting the rotor, the compression chamber 90 is divided into two chambers. As shown in the figure, the connecting rod 80 disposed outside the cylinder block 30 extends in a non-contact state around the outer peripheral wall of the cylinder block 30. In the present invention, the connecting rod 80 may be structurally formed in an arc-shaped, C-shaped, or U-shaped (but not limited to). One end of the connecting rod 80 is connected to the first follower 41 and the other end is connected to the second follower 42.

In the present invention, as the motor is driven so that the rotor rolls along the inner wall of the cylinder block 30, the following four operating states can be taken, as shown in Figs. 5 (a) to 5 (d). The first follower 71 protrudes into the compression chamber 90 when the sleeve cam 10 starts to move from the initial position toward the left end position and the second follower 72 protrudes into the compression chamber 90 90). Then, the volume of the upper portion of the left chamber is increased, thereby forming a low-pressure interior for introducing air into the compression chamber 90 through the first intake channel 71. [ As the rollers roll further to compress the incoming air and as the air pressure in the lower portion of the left chamber reaches a predetermined high pressure, the first valve 61 is pushed open and the compressed air is released through the first exhaust channel 51 do. When the sleeve cam 10 is moved from the left end position to the lower end position in the compression chamber 90, the operation of the first stage exhaust is completed. When the operation of the first stage exhaust is completed, the internal air pressure of the left chamber is reduced so that the first valve 61 returns to the closed state, and the external air is introduced into the compression chamber 90 through the first intake channel 71 .

Then, the rotor continues to roll along the inner wall of the cylinder block 30 to move the sleeve cam 10 from the lower end position to the right end position. At this time, the volume of the upper portion of the right chamber is increased to form a low-pressure chamber for guiding the intake of the outside air into the compression chamber 90 through the second intake channel 72. The rotor continues to roll to compress the intake air through the second intake channel 72. [ When the internal air pressure at the lower end of the right chamber is compressed and reaches a predetermined high pressure, the second valve (62) is pressed to open to discharge the internal compressed air through the second exhaust channel (52). Finally, as the sleeve cam 10 rolls from its right end position to its original initial position (upper position), the operation of the second stage exhaust is completed. When the operation of the second stage exhaust is completed, the internal air pressure of the right chamber is reduced, the second valve 62 returns to the original closed state, and the intake path for moving the outside air into the compression chamber 90 is the second And returns to the intake channel 72. In the present invention, the operating process of the first stage intake-compression-first stage exhaust-second stage intake-compression-second stage exhaust continues, and at the same time, the connecting rod 80 is moved to the first follower 71 and the second follower 72 in the axial direction. Particularly, the connection rods 80 and the followers 41, 42 are integrally displaced because the two followers 41, 42 arranged on the same axial line continuously contact the rolling rotor.

Referring to Figure 6, a schematic diagram of a second embodiment of a multi-way compressor in accordance with the present invention is provided. In the following description of the second embodiment, only elements different from those of the first embodiment will be described, and description of elements similar to those of the first embodiment will be omitted, and the same numbers and names will be retained.

In the second embodiment, the first spring means 810 is introduced for coupling one end of the connecting rod 800 with the corresponding end of the first follower 41, and the second spring means 820 is connected And the other end of the rod 800 and the corresponding end of the second follower 42 are joined. Both the first spring means 810 and the second spring means 820 may be compression springs.

Referring to Figs. 7 (a) to 7 (d), each operation stage of the second embodiment of Fig. 6 is schematically illustrated. The main difference in the operation between the first embodiment and this embodiment is that during the operating cycle the compressor of the second embodiment provides the spring force of each of the first spring means 810 and the second spring means 820 , It is possible to further secure the contact between the individual followers 41 and 42 and the corresponding outer peripheral wall of the sleeve cam 10. [ In particular, the axial movement of the first follower 41 and the second follower 42 can be achieved by tension and compression of the first spring means 810 and the second spring means 820, Lt; RTI ID = 0.0 > 800 < / RTI > That is, the connecting rod 800 can be isolated from the axial up-down movement of the followers 41, 42. In this embodiment, the followers 41, 42 associated with the connecting rod 800 can optionally be provided on the same axial line or on a non-coaxial line, and in parallel or non-parallel.

In addition, the multi-way compressor of the present invention may include a combination of at least one of the first follower 41, the second follower 42, and the connecting rods 80, 800. To accommodate embodiments having multiple combinations, the cylinder block 30 may include a corresponding number of intake channels, exhaust channels, and containment chambers. In practice, the number of branches of the combination depends on the capacity requirement of the facility. Naturally, the cyclic compression of the internal air according to the present invention and the divisional intake and exhaust of the exhaust (i.e., the divisional compression method), regardless of the capacity or the number of branches of the combination, satisfies these requirements.

The main features of the divisional compression method according to the present invention are as follows:

While the rotor of the compressor is performing the entire operating cycle, first stage intake, first stage compression and first stage exhaust can be performed in the first half (0 ° - 180 °) of this operating cycle; The second stage intake, the second stage compression, and the second stage exhaust can be performed in the second half of this operating cycle (180 ° - 360 °). Particularly, while the second half of the operating cycle is being executed, the first stage intake is generated at the same time. Particularly, in the present invention, the first stage intake and the second stage intake are performed through different intake channels, and the first stage exhaust and the second stage exhaust are also performed through different exhaust channels.

As described above, one of the various features of the compressor according to the present invention is that, within the operating cycle, the first stage intake-first stage compression - first stage exhaust - second stage intake - second stage compression - second One or more operational patterns, stepped exhaust, may be included. In both of the above embodiments, the stroke of each follower 41 or 42 is only half that of the conventional follower described in the Background section, but the single operation of the rotor of the multi- In the cycle, since a plurality of divided compression and exhaust are performed, the total compression capacity can be maintained substantially unchanged. Further, since the power output for the instant compressor can be reduced and the lateral force F is evenly distributed to the first follower 41 and the second follower 42, the abnormal operation described in the background section Can be largely minimized, and thus the operating life and operating efficiency can be greatly improved.

While the disclosure of the invention has been thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one of ordinary skill in the art are intended to be included within the scope of the following claims.

INDUSTRIAL APPLICABILITY The present invention can be applied to a multi-way compressor and a divisional compression method for the multi-way compressor.

10 sleeve cam
20 drive shaft
30 Cylinder Block
41 First followers
42 Second Follower
51 first exhaust channel
52 Second exhaust channel
61 first exhaust valve
62 Second exhaust valve
71 first intake channel
72 Second intake channel
80 Connection Load
90 compression chamber
G1 1st storage room
G2 second storage room

Claims (14)

A hollow cylinder block, a sleeve cam, a plurality of followers, and at least one connecting rod,
Wherein the hollow cylinder block includes a compression chamber, a plurality of intake channels, a plurality of exhaust channels, and a plurality of accommodating chambers, wherein one intake channel, one intake chamber, and one intake chamber are arranged in a clockwise arrangement pattern around the cylinder block Wherein the exhaust channels of the plurality of intake channels, the plurality of intake chambers and the plurality of exhaust channels are arranged sequentially; Each of said plurality of intake channels, said plurality of intake chambers, and said plurality of exhaust channels is spatially communicated with all of said compression chamber and said outside of said cylinder block; Each of said plurality of exhaust channels having a valve for sealing a corresponding exhaust channel;
Wherein the sleeve cam is disposed in the compression chamber, a part of the outer circumferential wall of the sleeve cam is in contact with an inner wall of the cylinder block, and a sleeve having one end coupled to the outer motor is coupled to the sleeve;
The plurality of followers are fitted in one of the plurality of accommodating chambers to which the followers correspond, one end of the follower contacts the other end of the outer peripheral wall of the sleeve cam, and each of the followers corresponds to To perform an axial movement along the containing chamber in the receiving chamber; And
Wherein the at least one connecting rod is disposed outside the cylinder block in a non-contact state, and one end of the connecting rod is coupled to the other end of the corresponding follower, And is coupled to the other end of the corresponding one of the followers
Wherein the compressor is a multi-directional compressor. The method according to claim 1,
The end of the connecting rod coupled to the end of one of the corresponding followers is moved in accordance with the axial movement of the corresponding follower,
The followers coupled to the connection rod are arranged in parallel on the same axial line
Wherein the compressor is a multi-directional compressor. The method according to claim 1,
The plurality of intake channels, the plurality of exhaust channels, the plurality of storage rooms, and the plurality of followers all have the same quantity
Wherein the compressor is a multi-directional compressor. The method according to claim 1,
The follower is secured to the connecting rod in one of threaded and pinned connections.
Wherein the compressor is a multi-directional compressor. The method according to claim 1,
The connecting rod is structurally formed in one of an arc type, a C shape, and a U shape.
Wherein the compressor is a multi-directional compressor. A hollow cylinder block, a sleeve cam, a plurality of followers, and at least one connecting rod,
Wherein the hollow cylinder block includes a compression chamber, a plurality of intake channels, a plurality of exhaust channels, and a plurality of accommodating chambers, wherein one intake channel, one intake chamber, and one intake chamber are arranged in a clockwise arrangement pattern around the cylinder block Wherein the exhaust channels of the plurality of intake channels, the plurality of intake chambers and the plurality of exhaust channels are arranged sequentially; Each of said plurality of intake channels, said plurality of intake chambers, and said plurality of exhaust channels is spatially communicated with all of said compression chamber and said outside of said cylinder block; Each of said plurality of exhaust channels having a valve for sealing a corresponding exhaust channel;
Wherein the sleeve cam is disposed in the compression chamber, a part of the outer circumferential wall of the sleeve cam is in contact with an inner wall of the cylinder block, and a sleeve having one end coupled to the outer motor is coupled to the sleeve;
The plurality of followers are fitted in one of the plurality of accommodating chambers to which the followers correspond, one end of the follower contacts the other end of the outer peripheral wall of the sleeve cam, and each of the followers corresponds to To perform an axial movement along the containing chamber in the receiving chamber; And
The at least one connecting rod is disposed outside the cylinder block in a non-contact state, and one end of the connecting rod is resiliently coupled to the other end of the corresponding follower through a spring means , And the other end of the connecting rod is resiliently coupled to the other end of the corresponding one of the followers through a spring means
Wherein the compressor is a multi-directional compressor. The method of claim 6,
The end of the connecting rod coupled to the end of one of the corresponding followers is moved in accordance with the axial movement of the corresponding follower,
The followers coupled to the connecting rod are arranged on the same axis or on a non-coaxial line, and in parallel or non-parallel arrangement
Wherein the compressor is a multi-directional compressor. The method of claim 6,
Said spring means being a compression spring
Wherein the compressor is a multi-directional compressor. The method of claim 6,
The plurality of intake channels, the plurality of exhaust channels, the plurality of storage rooms, and the plurality of followers all have the same quantity
Wherein the compressor is a multi-directional compressor. The method of claim 6,
The follower is secured to the connecting rod in one of threaded and pinned connections.
Wherein the compressor is a multi-directional compressor. The method of claim 6,
The connecting rod is structurally formed in one of an arc type, a C shape, and a U shape.
Wherein the compressor is a multi-directional compressor. A method of fractional compression applied to a rotary compressor,
Providing a compressor having at least two followers, at least two intake channels, and at least two exhaust channels, each of the at least two followers having an end coupled to the connecting rod;
While the rotor of the compressor performs the entire operating cycle (0 ° to 360 °), the first-stage intake, first-stage compression and first-stage exhaust at the first half (0 ° to 180 °) Sequentially performed; And
The second stage intake, the second stage compression and the second stage exhaust are successively performed in the second half portion (180 ° - 360 °) of the operating cycle
Lt; RTI ID = 0.0 >
The first stage intake is generated simultaneously during the execution of the second half of the operating cycle,
The first stage intake and the second stage intake are performed through different intake channels, and
The first stage exhaust and the second stage exhaust are performed through different exhaust channels.
And a second decompression method. The method of claim 12,
The connection rod coupled to the corresponding follower is moved in accordance with the axial movement of the corresponding follower,
The followers coupled to the connection rod are arranged in parallel on the same axial line
And a second decompression method. The method of claim 12,
The followers individually coupled to the connection rods are selectively mounted on the same axial line or on a non-coaxial line, and arranged parallel or non-parallel
And a second decompression method.

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