JPH0217195Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vane type compressor used particularly in air conditioners, car coolers, etc.

This type of vane compressor is small in size and generates little vibration and noise, so its use for compressing refrigerant has been rapidly increasing in recent years.

In order to improve the compression efficiency of this type of vane type compressor, a plurality of vane grooves 21 provided in the rotor 2 are used as shown in FIGS. 1, 2, and 3.
and a vane groove space 211 formed by the bottom surface 31 of the vane 3 slidably mounted in the vane groove.
Suction fluid pressure is supplied to the suction stroke region from the suction port 4, through the introduction passage 7 and check valve 11 provided in the side housing 6, and finally from the arcuate groove 8 formed on the inner wall surface of the side housing. This applies pressure to the vane bottom surface 31, prevents the vane groove space 211 from becoming negative pressure, improves the sliding of the vane, improves compression efficiency, and prevents abnormal wear on the inner wall surface of the rotor housing. Prevention is being done. Note that since the route is not clearly expressed in Figure 2, it is shown as a route diagram in Figure 3.

However, it has become clear that this conventional solution has the following deficiencies.

That is, during the suction stroke, suction fluid pressure is applied from the suction port 4 through the introduction passage 7 and check valve 11 provided in the side housing 6, and finally through the arcuate groove 8 formed on the inner wall surface of the side housing. When the vane 3 passes through the suction stroke and enters the compression stroke due to the rotation of the rotor, the suction fluid supplied to the vane groove space 211 during the suction stroke The pressure becomes very high by the time the discharge stroke is reached, and the pressure applied to the bottom surface 31 of the vane becomes large, which may cause abnormal wear of the vane 3, and the vane 3 may break. In particular, in the case of a lubricated vane compressor, oil is mixed with Freon gas as a refrigerant gas for suction, compression, and
Since lubrication is performed by discharging, the above-mentioned defects were noticeable.

In addition, particularly in the case of a lubricated vane type compressor, as mentioned above, there are problems caused by abnormal pressure in the vane groove space as well as abnormal pressure in the working chamber. That is, as the oil for lubrication is compressed in the compression stroke working chamber, the pressure inside the working chamber increases abnormally, causing adverse effects such as vane breakage.

Therefore, in this type of lubrication type vane compressor, it is necessary to solve the problem of the vane groove space mentioned above as well as the abnormal pressure increase in the compression stroke working chamber.

The present invention attempts to skillfully solve these problems.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 4 shows a sectional view of the present invention corresponding to FIG. 2, but since the explanation is complicated and difficult to understand, the route diagram shown in FIGS. 5 and 6 will be used for explanation.

First, during the suction stroke, the suction port 4 and the arcuate groove 8 communicate with each other via the introduction passage 7, as shown in FIG. Up to this point, there is no difference from the conventional technology. The features of the present invention are that an arcuate groove 81 is provided on the inner wall surface of the side housing corresponding to the vane groove space 211 in the compression stroke region;
A pressure outflow path 71 is formed from 1 to the discharge port 9, and an outflow check valve 1 is provided in the middle of this pressure outflow path 71.
The feature is that 1' is provided. With this configuration, the vane groove space 2 is reduced during the suction stroke.
The pressure of the suction fluid supplied to and confined in the vane 11 becomes very high, and the pressure applied to the bottom surface 31 of the vane becomes abnormally high, which has an adverse effect on the vane 3 (in this case, when it becomes much higher than the discharge pressure, especially in the lubricated type) In this case, the outflow check valve 11' opens only when oil is mixed with Freon gas as a refrigerant gas and is suctioned, compressed, and discharged for lubrication. It flows out to the discharge port 9 via the outflow passage 71. Therefore, abnormal pressure within the vane groove space is prevented, and the adverse effects such as vane breakage, which frequently occurred in the past, are resolved. In addition, check valve 1
1' is provided so that the discharge force of the discharge port 9 is connected to the outflow passage 7.
1 and the vane groove space 21 via the arcuate groove 81.
This prevents a high discharge pressure from being supplied to the vanes 1 and having an adverse effect on the vanes 3.

When forming the arcuate grooves provided in this compression stroke region, a plurality of arcuate grooves 8 are formed as shown in FIG.
Each arcuate groove 8 is divided into 1' and 81'.
1' is preferably provided with a pressure outflow passage 71 and a check valve 11' in order to apply appropriate pressure to the back surface of the vane. Furthermore, when the grooves 81' are divided into a plurality of circular grooves 81', the distance between the circular grooves 81' and the distance between the circular grooves 81 in the compression stroke region and the circular grooves 8 in the suction stroke region are as follows. It is necessary to set them at intervals of 5° to 35°. That is, when the angle θ is less than 5 degrees, the arcuate grooves are too close to each other, and the pressure supplied to the vane groove space 211 is the same in every stroke of the suction and compression strokes, resulting in an appropriate backing against the vane 3. Therefore, the responsiveness of the fluid pressure supplied to the vane groove space 211 also deteriorates. Furthermore, when the angle θ exceeds 35°, the distance between adjacent arcuate grooves becomes too large, and the vane 3 installed in the vane groove 21 provided in the rotor 2 is moved from the arcuate groove 8 in the suction stroke area to the compression stroke. The fluid pressure confined in the vane groove space 211 increases until the arcuate groove 81 is reached, and the vane back pressure becomes inappropriate, so it is necessary to set an interval of 5° to 35°. be.

Further, as shown in FIG. 4, a pressure outflow passage 72 is provided from the inner wall surface of the side housing corresponding to the working chamber in the compression stroke region to the discharge port 9, and an outflow check valve 11' is provided in the middle of this pressure outflow passage. It is being Therefore, when the oil for lubrication is compressed and the pressure rises abnormally, the check valve 11' provided in the middle of the pressure outflow passage 72 is pushed open and the oil flows out to the discharge port 9.
As a result, an abnormal rise in pressure in the working chamber in the compression stroke region is significantly prevented, and all the conventional defects such as vane breakage and the like are resolved.

The check valve 11' is provided to prevent the discharge pressure from flowing into the working chamber through the pressure outflow passage 72 when the pump is operating normally, thereby preventing the vane from being adversely affected and the pump efficiency from decreasing. It is set up for this purpose. Further, the most preferred check valve mentioned above is a reed valve in terms of manufacture, but it goes without saying that a ball valve or a similar valve may also be used.

As is clear from the above description, in the vane type compressor of the present invention, an arcuate groove is formed on the inner wall surface of the side housing corresponding to the vane groove space in the compression stroke region, and the pressure that reaches the discharge port from the arcuate groove is Since an outflow passage is provided and a check valve is provided in the middle of this pressure outflow passage, abnormal pressure increases in the vane groove space in the compression stroke region are significantly prevented, and adverse effects such as vane breakage, which were conventional defects, are prevented. Also, eliminate all
In particular, in the case of a lubricated vane type compressor, an abnormal rise in pressure in the compression stroke working chamber is significantly prevented because a pressure outflow passage is provided from the inner wall surface of the side housing facing the compression stroke working chamber to the discharge port. In combination with the above-mentioned pressure outflow passage provided in the vane groove space, the adverse effects such as vane breakage caused mainly by abnormal pressure increase are completely resolved, and the vane type compression can maintain high performance for a long time. This invention can be provided by a machine, and the effects of this invention are extremely large.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional vane compressor, Figure 2 is a cross-sectional view of a conventional vane compressor.
The figure shows a sectional view taken along the line A-A in FIG. 1, and for explanation purposes, the rotor, vanes, etc. are inserted along the two-dot chain line. Third
4 is a sectional view showing an embodiment of the present invention, and FIGS. 5 and 6 are route diagrams for explaining the present invention. Explanation of symbols, 2...rotor, 3...vane,
4... Suction port, 5... Rotor housing, 6...
...Side housing, 7...Introduction passage, 71, 7
2...Pressure outflow passage, 8...Suction stroke arcuate groove,
81...Compression stroke arcuate groove, 9...Discharge port, 1
1'... Check valve for outflow.

Claims (1)

[Scope of utility model registration request] A rotor is supported in a rotor chamber formed by a rotor housing and a pair of side housings, and vanes are slidably provided in each of a plurality of vane grooves of this rotor, and fluid is sucked by vane action as the rotor rotates. In a vane type compressor, suction fluid pressure is applied via an arcuate groove to the suction stroke area of the vane groove space formed by the vane groove and the bottom surface of the vane. An arc-shaped groove is provided on the inner wall surface of the side housing corresponding to the vane groove space in the stroke region, and a pressure outflow passage is provided from the arc-shaped groove to the discharge port, and an outflow check valve is provided in the middle of this pressure outflow passage. A pressure outflow passage is provided from the inner wall surface of the side housing corresponding to the working chamber of the compression stroke region of the vane type compressor to the discharge port, and an outflow check valve is provided in the middle of this pressure outflow passage. Vane compressor.