JPH0118867Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a vane compressor.

The compression chamber formed between the vaned rotor and the cylinder and the discharge chamber formed between the cylinder and the housing are communicated with each other through a plurality of discharge holes arranged in the cylinder wall, and each discharge hole is Vane compressors equipped with reed valves that open and close individually are well known, but conventional vane compressors of this type have a plurality of discharge holes 9a' and 9, as shown in FIGS. 4 and 5.
Since b' and 9c' are arranged uniformly on a plurality of lines perpendicular to the axial direction of the cylinder 3',
As the rotor 6' rotates, when the tip of the vane 5' reaches between the discharge holes 9a' and 9b', the compartment 8b' on the high pressure side in the rotation direction of the compression chamber 8' reaches the discharge pressure, and the reed valve 10a', 10b', 10c' are all in a floating state, and the discharge holes 9a', 9b', 9c' are all opened, and the gas in the compartment 8b' is discharged from the discharge holes 9b', 9.
It will flow out to the discharge chamber 4' through c',
At this time, since the compartment 8a' on the low pressure side of the compression chamber 8' has not yet reached the discharge pressure, a portion of the gas flowing from the compartment 8b' into the discharge chamber 4' through the discharge holes 9b' and 9c' is There is a problem in that the liquid flows back into the other compartment 8a' through the discharge hole 9a', increasing the pressure in the compartment 8a' and requiring unnecessary power. Therefore, as shown in FIG. 6, even when the inside of the compartment 8b' reaches the discharge pressure, only the reed valves 10b' and 10c' are opened and the reed valve 10
Reed valves 10a', 10b', so that a' is not opened.
It is conceivable to arrange the cylinders 10c' in parallel to the axial direction of the cylinder 3', but in this case there are many problems as follows. Firstly, compressors with narrow cylinder widths cannot obtain an appropriate valve length, which increases the stress acting on the valves.
Since the valve mounting screw must be placed in a position where the cylinder wall thickness is small, the necessary screw fitting length cannot be obtained, and it is inevitable that the screw will come loose. Thirdly, due to valve lift, the discharge holes are unevenly distributed on one side in the cylinder width direction, increasing discharge resistance and causing power loss.Fourthly, the discharge holes arranged in multiple rows in the rotor rotational direction are Due to the structural pitch of the reed valve arranged in the same line as the discharge holes, it is not possible to freely reduce the pitch between the discharge holes, and the distance between the discharge holes 10a' and 10c' shown in FIG. Even if the pressure becomes too large and the vane approaches, the discharge pressure may not be reached, in which case the reed valve 9a will not open and the discharge hole 10
There is also the disadvantage that a is disabled.

The present invention solves the above-mentioned problems by reliably opening only the discharge holes in the parts where the pressure increases sequentially as the vane moves, thereby eliminating wasted power. It was completed with the aim of creating a vane compressor that is free from defects such as loosening of screws.

In order to achieve the above object, the present invention has a compression chamber formed between a rotor with vanes and a cylinder, and a discharge chamber formed between the cylinder and a housing. In a vane compressor, the vane compressor is equipped with a reed valve that connects the discharge holes and opens and closes each discharge hole separately.
A plurality of discharge holes are arranged one each on a plurality of lines orthogonal to the axial direction of the cylinder, and at least one of the discharge holes is located at a position offset in the circumferential direction on the line, and the reed valve is aligned with the position of the discharge hole. Each has a different length. Further, the base end of the reed valve that opens and closes each of these discharge holes is connected to the low pressure side compartment 8a of the compression chamber in the direction orthogonal to the axial direction of the cylinder.
The cylinders are fixed to each other, and their operating ends extend toward the discharge hole and are arranged in parallel in the axial direction of the cylinder.The illustrated embodiment will be described in detail below.

1 is a housing, a cylinder 3 is fitted between the side plates 2 and 2 in the housing 1, and a discharge chamber 4 is formed between the cylinder 3 and the housing 1; A rotor 6 is provided to be rotated with a drive shaft 7, and a compression chamber 8 is formed between the rotor 6 and the cylinder 3, and the compression chamber 8 and the discharge chamber 4 are arranged on the cylinder wall. The three discharge holes 9a, 9b, and 9c communicate with each other. And these discharge holes 9a, 9
b and 9c are arranged one each on a plurality of lines perpendicular to the axial direction of the cylinder 3 on the cylinder wall, and at least one of them is at a position shifted in the circumferential direction on the line as shown in FIG. be. Furthermore, each discharge hole 9a, 9 is provided in the cylinder wall.
Reed valves 10a and 10 that open and close b and 9c separately
A plate-shaped discharge valve 10 having valves b and 10c is provided along with a retainer 11 at its base. These reed valves 10a, 10b, and 10c differ from the conventional ones shown in FIG. 6 in that their base ends are fixed near the low-pressure side compartment 8a of the compression chamber 8 in the direction orthogonal to the axial direction of the cylinder. Both of their working ends face the discharge hole in a direction perpendicular to the axial direction of the cylinder (direction of rotation of the vane).
The reed valves are arranged in parallel in the axial direction of the cylinder. In addition,
The reed valves 10a, 10b, 10c have discharge holes 9a, 9b, 9 at their distal ends, as in the embodiment shown in FIG.
The valve lengths are different for opening and closing the valves to eliminate waste of material. In the figure, 12 and 13 are a suction chamber and an oil separation chamber provided outside the side plates 2 and 2 in the housing 1, 14 is a communication hole that communicates the discharge chamber 4 and the oil separation chamber 13, and 15 is a communication hole 14. 16 is a vane groove in which the vane 5 is slidably fitted into the rotor 6; 17 is a suction hole provided in the suction chamber 12; and 18 is a discharge hole provided in the oil separation chamber 13.

The device configured in this way rotates the rotor 6 with the drive shaft 7 to open the suction hole 17 and the suction chamber 1.
2. When the gas sucked into the compression chamber 8 formed between the rotor 6 with vanes 5 and the cylinder 3 through the suction hole provided in the side plate 2 is compressed, the compressed gas is transferred to a plurality of chambers arranged on the cylinder wall. a discharge hole, a discharge chamber 4 formed between the cylinder 3 and the housing 1, a communication hole 14, an oil separator 15, and an oil separation chamber 1.
3. The discharge is discharged through the discharge hole 18 and circulated to the suction hole 17 via a condenser etc., which is similar to the conventional vane compressor of this type, but in the present invention, the discharge is disposed on the cylinder wall. Holes 9a, 9b, 9c
are located on each of a plurality of lines orthogonal to the axial direction of the cylinder 3, and the discharge holes 9a,
Since 9b and 9c are all positioned sequentially shifted in the circumferential direction as in the embodiment shown in FIG. 3, the following features are provided. That is, in the first embodiment, the rotor 6 having a plurality of vanes 5 rotates, and the tip of the adjacent vane 5 on the side in the rotation direction crosses the discharge hole 9c, and the tip of the vane 5 on the side in the opposite rotation direction crosses the discharge hole 9c. vane 5
When the tip of the compressed gas is located in front of the discharge hole 9a, the pressure of the compressed gas in the portion between the vanes 5 and 5 in the compression chamber 8 exceeds the discharge pressure, and the pressure of the compressed gas in the portion between the vanes 5 and 5 exceeds the discharge pressure, and
Reed valves 10a, 10b, 1 blocking 9c
0c floats up due to this discharge pressure and communicates with the discharge chamber 4, and the compressed gas flows out into the discharge chamber 4 through each discharge hole 9a, 9b, 9c, but as the rotor 6 rotates, the opposite rotation direction side When the tip of the vane 5 reaches between the discharge holes 9a and 9b, as shown in FIG. Out of the reed valves 10a, 10b, 10c which open and close the discharge holes 9a, 9b, 9c separately, the discharge hole 9b,
The reed valves 10b and 10c that are blocking the reed valves 9c continue to float due to the discharge pressure, and the compartment 8b of the compression chamber 8 and the discharge chamber 4 maintain communication with each other to drain the remaining compressed gas. Although the leakage continues,
The reed valve 10a provided in the discharge hole 9a is closed because the pressure in the other compartment 8a becomes lower than the discharge pressure. The compressed gas that has flowed out is properly sent to the oil separation chamber 13 side through the communication hole 14, and there is no backflow to the compartment 8a side.
Subsequently, when the tip of the vane 5 reaches between the discharge holes 9b and 9c, the reed valve 10b that had opened the discharge hole 9b is also closed, and when the tip of the vane 5 passes the position of the discharge hole 9c, the discharge is stopped. The reed valve 10c that opened the hole 9c is also closed and all the discharge holes 9 are closed.
a, 9b, 9c are reed valves 10a, 10b, 10
It returns to the normal state blocked by c.
When the compartment 8b and the discharge chamber 4 are communicated with each other, the compartment 8a
Since the internal pressure does not increase due to backflow, there is no need to waste effort in rotating the rotor 6. Moreover, in the initial stage when the amount of compressed gas in the compartment 8b is large, the discharge holes 9a, 9b, and 9c are all open and a sufficient discharge flow rate is ensured;
In the final stage when the amount of compressed gas b is small, the discharge hole 9
c is opened, and the opening area of the communicating portion between the compartment 8b and the discharge chamber 4 decreases in accordance with the decrease in the volume of the compartment 8b. This does not impede the flow of compressed gas from the to the discharge chamber 4, and further contributes to exhausting the entire amount of compressed gas. In addition, in the present invention, each reed valve 10a, 10b, 10
Since c is shaped to extend in a direction perpendicular to the axis of the cylinder, the bending stress acting on the valve can be reduced by providing a sufficient valve length, and the mounting screw can be placed at a position where the cylinder 3 is thick. This allows for a sufficient screw length and there is no need to worry about loosening. Furthermore, each discharge hole 9a, 9b, 9c is connected to the cylinder 3.
can be distributed uniformly in the width direction, reducing the discharge resistance, and the pitch of each discharge hole 9a, 9b, 9c in the rotational direction of the rotor is not affected by the structural pitch of the reed valve. Since they can be set freely, each discharge hole 9a, 9b, and 9c has the advantage of being able to reliably open from the pressure-increasing portion caused by the movement of the vane, and this effect is particularly effective in relation to the above-mentioned special discharge hole arrangement. This has a great effect on reducing waste. In addition,
In the illustrated embodiment, the cylinder has a circular cross section, but it goes without saying that it may also have an oval cross section.

As is clear from the description of the above embodiments, the present invention employs a special arrangement of a plurality of discharge holes arranged in the cylinder wall, and a reed valve extending in a direction perpendicular to the axial direction of the cylinder. This simple configuration eliminates all the drawbacks of conventional vane compressors, and together with the advantage of mass production at low cost, it has extremely great practical value.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a partially cutaway side view, Fig. 3 is an explanatory diagram showing the relationship between the discharge hole and the reed valve, and Fig. 4 is a conventional The partially cutaway front view of the vane compressor, FIGS. 5 and 6, are explanatory diagrams showing the relationship between the discharge hole and the reed valve in a conventional vane compressor. 1: housing, 3: cylinder, 4: discharge chamber,
5: Vane, 6: Rotor, 8: Compression chamber, 9a, 9
b, 9c: discharge hole, 10a, 10b, 10c: reed valve.

Claims (1)

[Scope of utility model registration request] The compression chamber formed between the vaned rotor and the cylinder and the discharge chamber formed between the cylinder and the housing are communicated with each other through a plurality of discharge holes arranged in the cylinder wall, and each discharge hole is In a vane compressor equipped with a reed valve that opens and closes separately, a plurality of discharge holes are arranged one each on a plurality of lines orthogonal to the axial direction of the cylinder, and at least one of them is offset in the circumferential direction on the line. The length of the reed valve is varied depending on the position of the discharge hole, and the base end of the reed valve that opens and closes each discharge hole is compressed in a direction perpendicular to the axial direction of the cylinder. A vane compressor, characterized in that the vane compressor is fixed to a side of the low-pressure side wall chamber 8a of the chamber, and its operating end extends toward the discharge hole and is arranged in parallel in the axial direction of the cylinder.