JPS59170488A - Compressor - Google Patents

Abstract

PURPOSE:To obtain a miniture, simple variable capacity compressor by forming at least two suction flow paths communicating with vane chamber and blocking the flow path in the latter half of suction stroke thereby minimizing suction loss. CONSTITUTION:Suction flow paths 56, 57 are formed in the sideboard of cylinder 50 or rear plate 51 while a suction hole 58 communicating with a vane chamber 59 is formed in the rear plate while having sufficient open area. The end of spool 60 of solenoid 59 is contained in a gap 62 between said flow paths 56, 57 through a through-hole 61 of spool 60 formed in the case 53 to block the refrigerant flow path. When increasing the open area of suction port 58 and blocking the effective flow path in the latter half of suction stroke, suction loss can be reduced considerably. Furthermore the outerdiameter of cylinder 50 can be reduced as conventional resulting in a miniture, simple variable capacity compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the control of refrigeration capacity in an air conditioner system using a rotary compressor.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the explanation of the present invention, a sliding vane type rotary compressor for a car cooler will be explained.

As shown in Fig. 1, a general sliding vane type compressor consists of a cylinder 1 having a cylindrical space inside, and a blade chamber 2 fixed to both sides of the cylinder and serving as an internal space of the cylinder 1.
a side plate (not shown in FIG. 1) that seals the cylinder 1 on its side, and a rotor 3 eccentrically arranged within the cylinder 1.
and a vane 5 slidably engaged with a groove 4 provided in the rotor 3. 6 is a suction hole formed in the side plate, and 7 is a discharge hole formed in the cylinder 1. vane 5
As the rotor 3 rotates, it flies outward due to centrifugal force, and its tip surface slides on the inner wall surface of the cylinder 1, thereby preventing leakage of gas from the compressor.

Compared to reciprocating compressors, which have a complex structure and many parts, this type of sliding vane rotary compressor has a smaller and simpler structure, and has recently been applied to compressors for car coolers. (It turned out.

As a means of making the rotary compressor shown in Fig. 1 variable in its capacity, a screw path is formed between the suction side and the blade chamber, and the rotary compressor is operated by high-pressure discharge gas. A method has been proposed in which the capacity can be arbitrarily varied from the outside by providing a valve in the in the room/
It is necessary to minimize the clearance loss at the opening of the air passage.
It is necessary to form the valve inside the cylinder, resulting in a complicated structure and a loss of continuity due to an increase in the outside diameter of the cylinder.

OBJECTS OF THE INVENTION The present invention provides a basic structure of a variable capacity compressor that solves the above problems.

Structure of the Invention The present invention forms at least two or more suction holes and a flow path so that the refrigerant flowing into each blade chamber is supplied from the suction holes independently from each other, and at least one of the flow paths is One is that it is equipped with a valve that can shut off the inflow of refrigerant, making it possible to realize a variable capacity compressor with an extremely simple configuration.

Description of examples Examples of the present invention will be described below.

FIG. 2 shows a front cross-sectional view of a compressor showing an embodiment of the present invention and a model of a refrigerant flow path, in which 11 is a cylinder, 12 is a vane, 13 is a sliding groove of the vane, and 14 is a rotor. , 15 is suction hole A, 4o is side plate, 17 is suction hole B, 22
23 is a discharge hole, 23 is a flow path A, 24 is a flow path B, 25 is an electromagnetic valve, 26 is a flow path C127, and a flow path D128 is a refrigerant supply source.

Hereinafter, the suction stroke of this compressor when capacity control is not performed will be explained using FIG. 3A to 3E.

18a, 18b, 18c are each blade chamber, 19 is cylinder 1
The top part 1, 20a, 20b is each vane. While the rotor 14 is rotating, the position where the tip of the vane 20a passes through the top part 19 of the cylinder 11 is θ-
Let Q be the origin, and let O be the angle taken at an arbitrary position VC,t-'' of the vane tip.Blade chamber 1 '8
Focusing on point a, FIG. 3A shows the state immediately after the vane 20a passes through the top portion 19. The opening in FIG. 3 shows a state in which the vane 20a is located between the suction hole A15 and the suction hole B17, and at this time, the blade chamber 18a has the suction hole A.
Refrigerant is supplied only from 15.

Figure C shows a state in which the vane 20a is passing through the suction hole B17, and at the same time, the vane 2ob, which runs following the vane 20a, is passing over the suction hole A15. After this, refrigerant is supplied from the suction hole A15 to the blade chamber 18a by the vane 2.
0b, and the supply from the suction hole 17 is started instead.

FIG. 3 2 shows a state in which refrigerant is supplied to the blade chamber 18a only from the suction hole B17.

FIG. 3E shows the state immediately after the vane 20b passes through the suction hole B1, and the refrigerant is supplied from the suction hole B17 to the vane 20b.
20b, the suction stroke ends at this point. Also, in a normal 4-vein compressor, θ=θs1
:225°, and the blade chamber volume is at its maximum at this point.

Figure 4 shows the change in the effective area of the flow path flowing into the blade chamber during the suction stroke of this compressor. is electromagnetic pulp 2
5 (FIG. 2) is turned off to block the inflow of refrigerant from the suction hole B17. 1 electromagnetic pulp 26
When it is turned off, the refrigerant does not flow into the blade chamber 18a as shown in Figure 2 and E in Box 3. The results of comparing the P■ characteristics of both are shown in FIG. In Fig. 5, A shows the case where the capacity is controlled, and the mouth shows the case where the capacity is suppressed. Refrigerant pressure drops. As a result, the total weight of the refrigerant at point b at the end of the suction stroke is significantly reduced.

In the conventional compressor (FIG. 1), the refrigerating capacity can be suppressed by narrowing the flow path connected to the suction hole 6. However, in this case, the pressure characteristics during the suction stroke become as shown in C, resulting in a significant increase in suction loss, resulting in L;
Mau. (Loss corresponds to area: S) The feature of this system is that at least two suction flow passages are formed that connect to the blade chamber,
By blocking the effective flow path in the latter half of the suction stroke, suction loss is minimized as much as possible.

Examples of the present invention will be specifically described below.

In Fig. 6, 60 is a cylinder, 61 is a rear plate, 62 is a heald cover, 53 is a rear case, 54 is a suction chamber in the hennod cover 52, 65 (is suction hole A, 56 is a flow path D, and 57 is a flow path B, 58 is a suction hole B leading to the blade chamber 59, 59 is an electromagnetic lens, 60 is a spool (moving part) of 61, 61 is a through hole of the spool 60 formed in the rear case 63, and 62 is a flow path 056. By storing the end of the spool 60 of the electromagnetic lens 59 in the circular gap formed between the flow paths 80,
Block the refrigerant flow path. 63 is a communication hole from the suction chamber 54 to the flow path, 64 is a suction pipe joint, and 65 is a clutch.

Fig. 7 shows a front sectional view of this compressor, and the flow passages 56, 57
is shown with an imaginary line.

In the embodiment, the suction flow passages 56 and 57 are formed in the rear plate 51, which is a side plate of the cylinder 5°, and the suction holes 858 are formed in the rear plate 53 with a sufficiently large opening area, so that the blade chamber can be accessed from the supply side. We were able to make the effective area of the flow path sufficiently large. As a result, a sufficient amount of refrigerant can be supplied to the blade chamber without restricting the refrigerating capacity, and suction loss during the suction stroke can be minimized.

Further, since the outer diameter of the cylinder 50 can be made smaller as in the conventional case, a simple and compact rotary compressor with variable capacity can be constructed.

Figures 7 and 8 show other embodiments of the present invention.
101 is a cylinder, 101 is a shell container, 102 is a renoid, 103 is a suction hole B, 104 is a suction hole A, 105 is a flow path B, and 106 is a flow path. The lenoid is housed inside the cylinder 100.

Effects of the Invention According to the present invention, a compressor with a variable capacity can be realized with a simple compaction structure, and can be widely used in rotary compressors that require variable capacity. It can be used for 3 vanes, 5 vanes, etc. Alternatively, if the cylinder is approximately elliptical, it can also be used in the case of a rolling piston type, and the effect is remarkable.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a conventional sliding vane compressor, FIG. 2 is a diagram showing the principle of the present invention, and FIGS. Fig. 4 is a diagram showing the relationship between the effective suction area and the vane running angle, Fig. 5 is a diagram showing the PV characteristics between the blade chamber pressure and volume, and Fig. 6 is a diagram showing the relationship between the effective suction area and the vane running angle. 7 is a front sectional view of the same, FIG. 8 (ri) is a front sectional view showing another embodiment of the present invention, and FIG. 9 (is an exploded perspective view of a partial cross section similar to compression). Fig. 14: Rotor, 11: Cylinder, 13:
... Vane, 15.17 ... Suction hole, 23,2
4.27... Distribution path, 28...] Lube, 4
0...Side plate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure-526- Figure 3 20α 200° Figure 6 t) 5 527- D1 Figure 9

Claims (1)

[Claims] A compressor that suppresses the refrigerating capacity during operation by utilizing suction loss in which the pressure in the blade chamber in the suction stroke 2 is lower than the supply source pressure of the refrigerant, the cylinder housing the rotor and the vanes; a side plate fixed to both sides of the vane, the rotor, and the cylinder, the side plate sealing the space of the blade chamber formed by the vane, the rotor, and the cylinder; and at least two or more suction holes formed in the cylinder or the side plate; A compressor comprising a flow path that communicates the suction hole with a refrigerant supply source side, and a valve provided at one end of the flow path.