JPH0138313Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a suction device for a rotary compressor used as a compressor for vehicle air conditioning.

<Prior Art> As a conventional rotary compressor suction device, for example, as described in Japanese Patent Laid-Open No. 56-64190, a suction port is provided on one side plate that covers the end face of a cylinder housing a rotor. Some apex seals have increased durability by providing them.

<Problems to be solved by the invention> However, in the case where the suction port is provided on the side plate in this way, the size of the suction port is limited, so it is not possible to use a rotary compressor with a large volume of the pump chamber. There is a problem that fluid suction efficiency is poor.

In order to eliminate such problems, it is effective to provide a suction port on each of the pair of side plates that cover the end face of the cylinder.
Simply providing suction ports on both side plates does not necessarily make suction efficiency sufficiently high. That is, when suction ports are provided on both side plates, suction chambers are formed on the outside of these side plates, and fluid is allowed to flow into these suction chambers from the same suction connector. If the length of the path from the suction connector to both suction chambers is different due to the There is a problem in that the inflow characteristics from the suction ports are not equal, and as a result, it is difficult to expect much improvement in suction efficiency by adding more suction ports. In order to equalize the suction efficiency of both suction ports, it is possible to forcibly provide a time difference by installing a barrier, but this would complicate the configuration and at the same time add resistance due to the barrier. Inhalation efficiency cannot necessarily be increased.

The present invention was developed in view of these circumstances, and takes into account the distance (resistance) between the suction chamber and the suction connector, which are provided on the outside of the side plate that covers both end faces of the cylinder. By changing the opening timing of the suction ports provided on both side plates, the amount of suction from both suction ports is made substantially the same, thereby improving the suction efficiency into the pump chamber. The purpose is to improve the efficiency of rotary compressors.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a plurality of vanes that slide on the inner diameter of a cylindrical cylinder, and a shaft located at an eccentric position within the cylinder to rotate the vanes. In a rotary compressor equipped with a supported cylindrical rotor and a pair of side plates covering both end surfaces of the cylinder, a suction chamber connected to the same suction connector is placed on the outside of both side plates. At the same time, a suction port is formed in each of the side plates for communicating between both suction chambers and the inside of the cylinder. The present invention is characterized in that a suction port that communicates between a suction chamber located far from the suction connector and the inside of the cylinder is expanded rearward in the rotational direction of the rotor compared to the other suction port.

<Function> As a result, the suction port that communicates the suction chamber located far from the suction chamber with the pump chamber is opened earlier than the other suction port, and as a result, the suction port of both suction ports is The efficiency is made to be substantially the same.

<Example> An example of the present invention will be described below based on the accompanying drawings.

In the figure, a housing 1 houses a cylindrical cylinder 2 and side plates 3 ₁ and _{3 2} that cover both end surfaces of the cylinder 2, and bearings 4 and 4 are housed in the side plates 3 ₁ and 3 ₂ . The rotor 5 is pivotally supported via. The rotor 5 is pivotally supported at an eccentric position within the cylinder 2, and is rotationally driven by an external drive source (for example, an automobile engine) not shown.

Incidentally, two vanes 6, 6 along the diameter direction of the rotor 5 are slidably attached to the rotor 5 so as to be orthogonal to each other.
Apex seals 7, 7 are attached to the tips of the cylinders 2 and 7, respectively, so as to be in sliding contact with the inner diameter of the cylinder 2.

On the other hand, suction chambers 8 1 and 8 2 are formed on the outside of both side plates 3 ₁ and 3 ₂ , respectively, and a suction chamber that communicates these suction chambers _{8 1} and _{8 2 with} the pump chamber 10 is provided. port 9
₁ and 9 ₂ are formed on each side plate 3 ₁ and 3 ₂ , respectively. A suction connector 11 is provided in the suction chamber 8 ₁ located on the right side in the figure, and the suction chamber 8 ₂ located on the left side in the figure and the other suction chamber 8 ₁ are passed through the cylinder 2. They are communicated via the formed communication paths 12, 12.

Also, a suction port 9 ₂ provided on the side plate 3 ₂ located on the left side in the figure, that is, a suction port 9 that communicates the suction chamber 8 ₂ located far from the suction connector 11 with the pump chamber 10. ₂ to the rear in the rotational direction of the rotor 5 than _the other suction port 9 ₁ as shown by the dashed line in _FIG . We are trying to open it earlier.
13 is a delivery valve, 14 is a discharge chamber, and 15 is a discharge connector.

In the rotary compressor configured as described above, when the rotor 5 rotates, the fluid (refrigerant) introduced into the suction chambers 8 ₁ , 8 ₂ via the suction pipes is transferred to the suction ports 9 ₁ , 9 ₂ .
is drawn into the pump chamber 10 through the rotor 5, is gradually compressed as the rotor 5 rotates, is finally discharged into the discharge chamber 14 via the delivery valve 13, and is condensed via the discharge connector 15. It is sent out to a container, etc. Note that since this is the same as the conventional one, the explanation thereof will be omitted.

Here, in the present invention, as described above, the suction port 9 ₂ that communicates the suction chamber 8 ₂ and the pump chamber 10 located far from the suction chamber 11 is arranged in a direction in which the rotation direction of the rotor 5 is larger than that of the other suction port 9 ₁ . Because of the rearward expansion, this expanded suction port 9 ₂ opens earlier than the other suction port 9 ₁ . Therefore, even if it becomes difficult for the fluid (refrigerant) to flow into the suction chamber ₈₂ due to the resistance of the communication passages 12, ₁₂ that communicate the suction connector 11 and the suction chamber 82, Like this suction port 9 ₂
will open earlier. For this reason, the suction action starts earlier as the resistance is greater, and the opening area of the suction port ₉₂ also increases due to expansion, so the resistance increases due to being located far from the suction connector 11. The reduction in suction _efficiency due to
Substantially the same amount of fluid will flow into the pump chamber 10 from 9 ₂ .

That is, depending on the inner diameter of the cylinder 2, the outer diameter of the rotor 5, and the number of vanes 6, 6, the suction port ₉₁ ,
Since the end position and width of suction ports 9 ₂ are restricted, if the opening positions were made the same as in the past, the opening areas of both suction ports 9 ₁ and 9 ₂ would be exactly the same, which would result in connection connector 1
The efficiency of inflow into the pump chamber 10 from the suction chamber ₈₂ , which is far from the suction chamber 82, has been lowered, but if the suction port ₉₂ is expanded rearward in the rotational direction of the rotor 5 as described above, this will be reduced. Therefore, the timing at which the pressure starts to be transmitted to the suction chamber 8 ₂ is earlier, and the opening area of the suction port 8 ₂ can be expanded, thereby making it possible to compensate for a decrease in inflow efficiency due to an increase in resistance.

In the embodiment, two vanes are slidably held through the rotor so that discharge (compression) is performed four times during one rotation of the rotor.
The number of vanes is not limited to the embodiment.

<Effects of the invention> As explained above, according to the invention, suction ports are provided on both sides of the pump chamber, and the suction port located farther from the suction connector is rotated more quickly than the other suction port. Since the fluid is expanded backward in the direction so that fluid is sucked into the pump chamber from both suction ports with the same efficiency, the fluid suction efficiency is higher than that of conventional ones, and the efficiency of the rotary compressor is improved. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view taken along the line 1 in FIG. 1, and FIG. 3 is an enlarged sectional view of the main parts. 2... Cylinder, 3 ₁ , 3 ₂ ... Side plate, 5... Rotor, 6, 6... Vane, 8 ₁ , 8 ₂
... Suction chamber, 9 ₁ , 9 ₂ ... Suction port, 10 ... Pump chamber, 11 ... Suction connector, 12, 12 ... Communication path.

Claims (1)

[Scope of utility model registration request] A plurality of vanes that slide on the inner diameter of a cylindrical cylinder, a cylindrical rotor that is pivotally supported at an eccentric position within the cylinder to rotate the vanes, and a pair of side plates that cover both end surfaces of the cylinder. In the rotary compressor equipped with a rotary compressor, suction chambers connected to the same suction connector are formed on the outside of the both side plates, and a suction port that communicates between the suction chambers and the inside of the cylinder is formed on the side plate. A suction port formed on each plate and communicating between a suction chamber located far from the suction connector and the inside of the cylinder is extended rearward in the rotational direction of the rotor in comparison with the other suction port. A rotary compressor suction device featuring: