JPH01141391U - - Google Patents

Description

[Brief explanation of the drawing]

1 to 6 show a variable displacement vane compressor according to an embodiment of the present invention, and FIG. 1 shows a variable displacement vane compressor cut at a 45 degree angle passing through the axis. Vertical cross-sectional view of the ivy, Figure 2 is the same as Figure 1.
A cross-sectional view along the line showing the full operating position, Figure 3 is a cross-sectional view similar to Figure 2 showing a partial operating position,
Figure 4 is a plan view showing the front side block.
Figures 5a to 5d are diagrams for explaining the action, Figures 6a and 6b are graphs showing the relationship between vane tip pressure and vane back pressure, and Figure 6a is a graph showing the relationship between vane tip pressure and vane back pressure. Fig. 6b is the graph when the time is partially operational, Fig. 7
The figure is a graph showing the relationship between capacity and vane back pressure during the suction stroke of a variable capacity compressor, Figure 8 a, b
Each figure is a graph showing the relationship between vane tip pressure and vane back pressure in a conventional variable displacement compressor. Figure 8a is a graph when the compressor is fully operating, and Figure 8b is a graph when it is partially operating. be. 1...Cam ring, 1a...Inner peripheral surface, 2...Rotor,
3...Front side block (one side block), 4...Rear side block (side block), 10...Discharge chamber, 10a...Oil reservoir chamber, 12 _... Compression chamber, _131-135 ...Vane groove, _1310- 1
3 ₅₀ ... Hole at the bottom of the vane groove, 14 ₁ to 14 ₅ ... Vane, 22... Back pressure introduction groove, 23... Oil feed hole for back pressure,
27...Control member, Pk...Vane back pressure at intermediate pressure, P
k'...High vane back pressure, Ps...Suction pressure.

Claims (1)

[Scope of utility model registration request] A compression chamber defined between the inner circumferential surface of the cam ring whose both ends are closed by side blocks and the outer circumferential surface of the rotor rotating within the cam ring, and a compression chamber that can freely appear and retract in the vane groove of the rotor in a radial direction. In a variable displacement compressor equipped with a plurality of fitted vanes and a control member that rotates to control the compression start timing, a rotor-side end surface of one side block is provided with a control member that controls the compression stroke from the start of the suction stroke. A back pressure introduction groove is provided which communicates with the hole at the bottom of the vane groove partway through the hole and introduces vane back pressure at an intermediate pressure between the discharge pressure and the suction pressure into the hole at the bottom, and the hole at the bottom and the back pressure A back pressure oil feed hole that communicates with the bottom hole from when communication with the introduction groove is cut off until the end of the discharge stroke and introduces high vane back pressure slightly lower than the discharge pressure into the bottom hole. A variable displacement compressor, characterized in that a variable displacement compressor is provided on an end surface of the one side block on the rotor side in communication with an oil reservoir chamber in the discharge chamber.