JPH0765568B2 - Compressor - Google Patents

Description

Description: FIELD OF THE INVENTION This invention relates to compressors, and more particularly to inertial compressors.

2. Description of the Related Art A conventional compressor of this type has a structure as shown in FIG. Reference numeral 1 is a frame supported on support springs 3 and 4 on a base 2, 5 is a cylinder slidably mounted on the frame 1, and 6 is a free piston slidably mounted on the cylinder 5. . Reference numeral 7 is a crankshaft that is rotatably attached to the frame and is rotated by a motor, and 8 is a connecting rod that is attached across the crankshaft 7 and the cylinder 5. Reference numerals 9 and 10 are low-pressure gas passages, 11 and 12 are intake valves, 13 and 14 are compression chambers, 15 and 16 are discharge valves, and 17 and 18 are high-pressure gas passages.

Next, the operation will be described. The cylinder 5 moves up and down by a motor, a crank shaft 7, and a connecting rod 8. By the way, the mass of the free piston 6 is sufficiently large, and even if the cylinder 5 moves up and down, the free piston 6 tries to stay at that position, and as a result, the distance between the cylinder 5 and the free piston 6 increases or decreases. . When the cylinder 5 rises, the volume of the compression chamber 13 increases, the suction valve 11 opens, and the low-pressure gas flows into the compression chamber 13 through the flow passage 9. Further, when the cylinder 5 is lowered past the top dead center, the suction valve 11 is closed, and when the cylinder 5 is further lowered, the discharge valve 15 is opened and the high pressure gas flows out through the flow path 17.

On the other hand, in the same manner, along with the vertical movement of the cylinder 5, the flow path 1
The low-pressure gas that has entered the compression chamber 14 through the suction valve 12 becomes high-pressure gas and flows out through the discharge valve 16 and the flow path 18.

Problems to be Solved by the Invention However, such a structure has the following problems. That is, in such a positive displacement compressor, the compression chamber
The volumetric efficiency of the compression chamber 13 is the higher when the volume of the compression chamber 13 is the smallest (hereinafter, abbreviated as the gap volume), and thus the adiabatic efficiency is generally higher. Is.

Therefore, during operation, the rotational speed of the crankshaft 7, the pressure in the flow paths 9, 10, 17, 18 and the like are adjusted so that the gap volume of the compression chambers 13, 14 is as small as possible.

However, if the gap volume is operated too small, even a slight disturbance, for example, the pressure variation in the flow paths 9, 10, 17, 18 will cause the gap volume to fluctuate, and if it becomes too small, the cylinder 5 and the free piston 6 will be It may collide and be destroyed.

For this reason, the gap volume is given a large eye so that it will not collide even if there is a disturbance. Therefore, there is a drawback that the volumetric efficiency of the compressor is lowered and the adiabatic efficiency is also lowered.

Means for Solving the Problems And technical means of the present invention for solving the above problems,
This is a compressor that suppresses the operating range of a piston that moves in the cylinder, thereby making the minimum value of the volume of the compression chamber formed by the piston and the cylinder constant.

Operation The effects of this technical means are as follows. That is, the minimum value of the volume of the compression chamber is kept constant, and damage to the equipment is suppressed.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 22 is a frame supported on the support springs 20 and 21 on the base 19, 23 is a cylinder slidably mounted on the frame 22, and 24 is slidably mounted on the cylinder 23. It is a piston. Reference numeral 25 is a crank shaft rotatably mounted on the frame 22 and rotated by a motor, and 39 is a connecting rod mounted on the crank shaft 25 and the cylinder 23. Reference numerals 26 and 27 are low-pressure gas passages, 28 and 29 are intake valves, 30 and 31 are compression chambers, 32 and 33 are discharge valves, and 34 and 35 are high-pressure gas passages. Reference numeral 36 is a crank shaft mounted on the cylinder 23, and 37 is a connecting rod mounted over the shaft 38 mounted on the piston 24 and the crank shaft 36.

Next, the operation will be described. The cylinder 23 moves up and down by the motor, the crankshaft 25, and the connecting rod 39. By the way, the mass of the piston 24 is sufficiently large so that the piston 24 hardly moves with respect to the base 19. Therefore, when the cylinder 23 moves up and down, the distance between the cylinder 23 and the piston 24 increases or decreases. When the cylinder 23 rises, the volume of the compression chamber 31 increases, the suction valve 29 opens, and low-pressure gas flows into the compression chamber 31 through the flow path 27. Further, when the cylinder 23 goes past the top dead center and goes down, the suction valve 29 closes, and when it goes down further, the discharge valve 29
33 opens and high-pressure gas flows out through the flow path 35. on the other hand,
Similarly, with the vertical movement of the cylinder 23, the low-pressure gas that has entered the compression chamber 30 through the flow passage 26 and the suction valve 28 becomes high-pressure gas and flows out through the discharge valve 32 and the flow passage 34.

By the way, in this embodiment, the cylinder 23 and the piston 24 are provided as means for keeping the minimum value of the volume of the compression chambers 30, 31 constant.
A crankshaft 36, a connecting rod 37, and a shaft 38 are provided across

Therefore, since the vertical relative movement range of the piston 24 and the cylinder 23 is restricted by the crankshaft 36, the connecting rod 37, and the shaft 38, the piston 24 and the cylinder 23 do not collide with each other, and the gap volume is always constant. It can be operated in a minimal and constant manner. For this reason, there is an effect that the volume efficiency is high and the heat insulating efficiency can also be increased.

EFFECTS OF THE INVENTION The present invention relates to a cylinder, a means for moving the cylinder, a member provided to form a compression chamber whose volume changes together with the cylinder by slidably moving on the inner wall of the cylinder, and the compression chamber. Means for keeping the minimum volume value constant,
A flow path that communicates between the compression chamber and the outside of the cylinder, a suction valve,
Since the compressor is provided with the discharge valve, the volume efficiency and the adiabatic efficiency are increased.

[Brief description of drawings]

FIG. 1 is a sectional view of a compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional compressor. 22 …… frame, 25 …… crank shaft, 23 …… cylinder,
24 …… Piston, 36 …… Crankshaft, 28,29 …… Suction valve, 32,33 …… Discharge valve.

Claims (1)

[Claims] 1. A cylinder, means for moving the cylinder, and a piston provided so as to form a compression chamber whose volume changes with the movement of the cylinder by slidably moving on the inner wall of the cylinder. A means for keeping the minimum value of the volume of the compression chamber constant, a flow passage communicating the compression chamber with the outside of the cylinder, and an intake valve and a discharge valve provided between the compression chamber and the flow passage. Compressor.