JPH0264282A - Gas compressor - Google Patents

Abstract

PURPOSE:To keep the compressed and discharged gas in the clean state and extend the operating time of a compressor by arranging seal bars on the sliding faces of rotary blades including a driving shaft and the fixed side via abrasion limiting means in a displacement type reciprocating gas compressor. CONSTITUTION:Multiple holes 27a-29a are provided at parallel positions on sliding faces of seal bars 27-29 freely coupled in respective grooves 16 provided on blade top sections 4c, blade side sections 4d and inner peripheries 3a of suction valve beds 3. Abrasion limiting mechanisms of the seal bars 27-29 are constituted of seal bar holes 27a-29a and screwed pins 31. No abrasion powder of the seal bars is mixed with the compressed gas.

Description

Detailed Description of the Invention a. Industrial Field of Application The present invention relates to a volumetric reciprocating gas pressure tan, and in particular, to a cylinder chamber in which rotatable blades are arranged in a plurality of spaces having a fan-shaped cross section divided into equal volumes. The present invention relates to an improvement of a gas compressor which is constructed by installing and performing rocking motion.

b. Prior Art FIG. 4 is a partially cutaway perspective view showing the concept of a conventional gas compression system including a crank mechanism of this type of gas compressor.

In the same figure, the gas compression system is mainly a gas compressor 101. Crank mechanism 102 and unload valve 1
03.

The gas compressor 101 has a cylinder 1041 and rotating blades 105.
．． The drive shaft 105a that drives this, the rotating blade m 10
5 and the inner surface of the cylinder 104; a sealer 106; a suction valve 107 for sucking gas; This suction valve 10
7 is attached to the suction valve stand 108. and a discharge valve 109 that discharges compressed gas.The crank mechanism 102 is a mechanism that converts rotational motion into rocking motion, and the drive arm 111. which rocks the drive shaft 105a. Chain ring 1121 Curved shaft 113
．． and ■Pulley 114. Note that 115 is an oil seal, which is disposed between the cylinder 104 and the bearing of the drive shaft 105a, and makes the gas compressor lot an oil-less structure.

FIG. 5 is a sectional view showing the details of the main structure of the conventional rocking type gas compressor 101, and FIG.
FIG.

In the same figure, in order to form a space 2.2 having an equal volume with two fan-shaped cross sections centered around the cylinder axis inside a cylinder l whose inner surface has been finished, two spaces 2.2 having the same -S-shaped cross section are formed.
The suction valve stands 3, 3 are fixed facing each other in the cylinder 1. Inside the cylinder 1 is a rotator 4 which is rotatable, with its center aligned with the cylinder axis, and two rotary blades 4a, 4a fixed or integrated symmetrically to the drive shaft 4b.
and the two rotating blades 14a, 4a are in the fan-shaped space 2.
．． 2 so that it can swing within a range of about 90 degrees or more. The I8 movement is performed by the crank mechanism 102 converting the rotational movement of the V-pulley 114 into a swinging movement, which is transmitted to the drive shaft 4b.

A suction hole 5 communicating with an external gas suction port (not shown) is formed in the suction valve stand 3, and the liquid hole 5 is connected to the two fan-shaped spaces 2.2 through a plurality of communication holes 6. The suction valves 7 are respectively attached to the openings by screws 7a. 8 is a back plate for restricting the movement of the suction valve 7 within a predetermined range.

The fan-shaped space 2 is provided on both left and right sides of the cylinder 1.
．． 2, a discharge hole 9 communicating with the outer surface of the cylinder 1 is provided, and a discharge valve 10 is attached to the outer surface opening of the cylinder 1 by a screw 10a, and as described above,
A back plate 11 is attached to limit the movement of the discharge valve IO within a predetermined range.

The discharge valves 10.10 are mounted on both outer surfaces of the cylinder l on which the discharge valves 10.10 are mounted, respectively. A discharge valve casing 13 having a gas flow path 12 penetrating therein is attached so as to cover the to, and communicates with the discharge port 14. These outlets 14.14 are interconnected by flow pipes (not shown) and are led to an external tank (not shown).

Next, the operation of this gas compressor 101 will be explained.

The crank mechanism 102 rotates the rotating wing $1 of the rotating element 4.
As shown in FIG. 5, 4a+4a performs a rocking movement left and right and reciprocates between positions A and B shown by the dashed line in the fan-shaped space 2. Now, the rotor 4 is driven and the rotor blade tf
When 14a moves in the direction of the arrow, the gas being sucked into the fan-shaped spaces 2-+ and 2-1 on the upper left and lower right sides is transferred to the suction valve 7.
As the gas closes, it is compressed, and the pressure in the space 2-3 rises, and when it becomes higher than the discharge pressure, the discharge valve 10 is opened, and the compressed gas is discharged to the discharge port 14 through the valve 1o.

At the same time, the volume of the fan-shaped spaces 2-z and 2-* on the upper right side and lower left side on the opposite side of the blade 4a increases, the pressure in the spaces 2-2 decreases, and the suction valve 7 opens. Then, gas is sucked in from the external gas suction port through the suction hole 5 and the conduction hole 6.

When the rotary blade 14a moves in the opposite direction, each valve 7. which communicates with the left and right fan-shaped spaces. lO operates in the opposite manner to that described above.

In this way, the swinging motion of the rotating blades IH4a, 4a creates the fan-shaped spaces 2-5, 2-t on both sides of the blade 4a.
Continue alternately inhaling and compressing the gas.

On the other hand, between the inner surface 1a of the cylinder 1 and the blade top portion 4C.

The cylinder side wall 15 and the blade side portion 4d and the inner circumferential surface 3a of the suction valve stand 3 and the drive shaft 4b face each other with a slight gap and are not in direct contact. However, since there are gaps in reality, compressed gas leaks through them. Therefore, one or two sealers 16 are provided in each of the grooves 16, and a sealer 17 made of a self-lubricating material, such as a plate material such as carbon or polyfluoroethylene (trade name: Teflon), is provided in each groove 16.
．． 18 and 19 are loosely fitted into each other, thereby creating a seal.

C0 Problems to be Solved by the Invention In the conventional gas compressor, the sealer 1
An example of a cross-sectional view of the portion where 7.18.19 is loosely fitted into each groove 16 is shown in FIG.
The blade top portion 4c and the cylinder inner surface 1a are slid by the sealers 17 loosely fitted in the two grooves 16 provided in the blade c.
Seal the gap 20 between.

Now, when the rotary blade 4a swings in the direction of the arrow, the space to the left of the blade 4a becomes the compression side, and its pressure is high, and the space to the right becomes the suction side, and the pressure is equal to or higher than the suction pressure. , or lower. Therefore, the sealer 17 loosely fitted in the groove 16 is pushed to the right side in the groove 16 by the pressure on the left compression side and the frictional force with the cylinder inner surface 1a, and is pushed to the left side in the groove 16. A slight gap 21 is created. Then, the compressed gas on the left side passes through the gap 2o with the blade top 4c and the gap 21 on the left side in the groove 16,
It enters the gap 22 between the bottom surface of the groove 16 and the seal bar 17, and its pressure presses the sealer 17 in the direction shown by the arrow, that is, in the direction of the inner surface 1a of the cylinder, thereby maintaining airtightness. Similarly, one of the sealers 17 is pressed toward the inner surface 1a of the cylinder by the compressed gas, and the compressor is operated with the entire seal being double-slidingly sealed by the sear 7L/bar 17.17.

However, since the sealers 17, 18, and 19 slide under pressure from the gas pressure on the compression side, the sliding surfaces thereof gradually wear out and eventually lose their airtightness. In particular, this type of gas compressor has a so-called oil-less structure in which there is no lubricating oil on the sliding surfaces of the sealers, so the wear is relatively large.Furthermore, when the gas being handled is so-called dry gas that does not contain water vapor, This resulted in extremely high wear, which was a disadvantage of oilless compressors.

At the same time, there was also the problem that abrasion powder of carbon or polybutylene, which is the material of the sealer, was mixed into the compressed gas.

The present invention has been made in view of the above problems, and its purpose is to provide a gas compressor that eliminates the above-mentioned problems, eliminates wear of the sealer, and maintains compressed discharge gas in a clean state at all times. be.

d. Means for Solving the Problems The configuration of the present invention for achieving the above object is such that the cylinder chamber is divided into a plurality of equal volumes with the cylinder axis as the center and has a fan-shaped cross section. In a gas compressor that sucks in and discharges gas by a rotary vane that oscillates around a shaft, a sealper is applied to the sliding surface between the rotary vane and the stationary side, including the drive shaft, through a wear limiting means. It is characterized by having a.

e. Operation In the gas compressor configured as described above, when the wear of the sealer reaches a predetermined limit, the wear is limited by the wear limiting means to prevent the wear from progressing beyond the limit.

f. Examples Hereinafter, preferred embodiments of the present invention will be described in detail by way of example based on the drawings.

FIG. 1 is a cross-sectional view of the main parts of a gas compressor showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the seal bar attached as viewed from the line 1--2 in FIG. Components that are the same as those of the conventional gas compressor shown in FIGS. 5 and 6 are designated by the same reference numerals, and their explanations will be omitted.

In Fig. 1.2, between the inner surface 1a of the cylinder 1 and the blade top 4c, between the cylinder side wall 15 and the blade side 4d, and between the inner peripheral surface 3a of the suction valve stand 3 and the outer peripheral surface of the drive shaft 4b. In order to seal the gaps between the blades and limit the wear of the sealing material, grooves 16 are provided in the blade top portion 4c + blade side portion 4d and the inner circumferential surface 3a side of the suction valve stand 3. The loosely fitted sealer 27, 28, 29 has a plurality of holes 27a, 28a at positions parallel to its sliding surface.
, 29a are provided respectively. In addition, each groove 16 includes
Holes 27a, 28 of said sealer 27, 28, 29
a + 29a, a bottle hole 30 is provided which penetrates each groove 16 in the right angle direction and does not penetrate the blade top portion 4c + blade side portion 4d and the suction valve stand 3, respectively, and a part of the machined surface side. carve a screw into the To install the sealper 27, 28, 29, use this pin hole 3o.
A threaded pin 31 having a diameter smaller than that of the seal bar holes 27a, 28a, 29a is inserted into the liquid holes 27a, 28.
A, 29a is inserted and screwed, and is fixed with a screw fixing agent.

In this way, the wear limiting mechanism of the sealer is composed of the seal bar hole and the threaded pin, and the seal bar hole 27a,
The positions of 28a and 29a, the hole diameter, and the pin diameter of the threaded pin 31 are determined by the material dimensions of the sealer, the operating conditions of the compressor, and the like.

FIG. 3 shows the sealer 27 during operation in FIG.
．． 28 is a sectional view showing a state when wear is limited. FIG. That is, during operation of the compressor, the sealers 27 and 28 move outward with respect to the rotary blades 1i14a due to the pressure of the compressed gas, and their sliding surfaces are gradually worn away.
In the position shown in FIG.
Movement is restricted due to As a result, the seal bar 27
．． 28 will be subject to wear limitations and will no longer be pressed against the sliding surface, so the sealers 27, 28 will not wear out and the sliding surfaces will operate without clearance. The same applies to the other sealers 29.

Therefore, the operating time of the compressor can be increased while maintaining its performance.

It should be noted that the technology of the present invention is not limited to the technology in the above embodiments, but can also be applied to means of other embodiments that perform the same function←
Furthermore, the technology of the present invention allows various changes and additions within the scope of the above configuration.

f. Effects of the Invention As is clear from the above description, the present invention provides a gas compressor with a seal perforated on the sliding surface between the fixed side and the rotary blade including the swinging drive shaft through a wear limiting means. As a result, after the wear of the sealer reaches a predetermined limit, the wear is limited by the wear limiting means and does not progress any further, and the clearance on the sliding surface is almost zero and the gas compression The machine continues to operate. Therefore, the abrasion powder of the sealer is not mixed into the compressed gas, and the compressed and discharged gas can be maintained in a clean state, and the operating time of the compressor can be extended.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts of a gas compressor showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of the seal bar installed as viewed from the ■-■ line in Fig. 1, and Fig. 3 is a seal bar installed during operation. Fig. 4 is a partially cutaway perspective view showing the concept of a conventional gas compression system including the crank mechanism of a gas compressor, and Fig. 5 is a cross-sectional view showing a state when wear is limited. A cross-sectional view showing the main structure of the compressor, Figure 6 is VT-Vl in Figure 5.
FIG. 7 is a sectional view taken along the line, and FIG. 7 is a sectional view of the top of the blade. 1... Cylinder, 3... Speech valve stand, 4...
"・Rotating element, 4a... Rotating blade, 4b...
・Drive shaft, 4C...Blade top, 4d...
Blade side part, 27.28.29...Seal par 27a, 28a, 29a...Seal bar hole, 31...
・Threaded pin. Figure 2 Figure 3 Figure 6 Figure 7

Claims (1)

[Claims] Gas compression in which a cylinder chamber is divided into a plurality of equal volumes and has a fan-shaped cross section, and gas is sucked in and discharged by rotating blades that swing around the cylinder shaft. 1. A gas compressor, characterized in that a seal bar is disposed on a sliding surface between the rotary blade including the drive shaft and the fixed side via a wear limiting means.