JPS6320877Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a gas compressor for a car cooler.

A gas compressor for a general car cooler is installed in parallel with an automobile engine, is rotationally driven from the engine's crankshaft pulley via a V-belt, and is connected to the drive side by an electromagnetic clutch attached to the compressor side.

Therefore, the capacity of the gas compressor increases approximately in proportion to the rotational speed of the automobile engine. This causes the phenomenon that when a car runs at high speed for a long period of time, the cooler works too hard, causing the interior of the vehicle to become overcooled, and the power consumption of the gas compressor increases more than necessary. bring about

In order to prevent the above-mentioned overcooling, the electromagnetic clutch is configured to control on/off operation of the gas compressor by intermittent operation of the electromagnetic clutch based on the output of a temperature sensor installed in the evaporator, etc. There is. However, such a configuration causes problems such as frequent engagement and disconnection of the electromagnetic clutch, which causes severe wear and tear on the clutch, and increases load fluctuations in the engine.

This idea was created in view of the conventional problems mentioned above, and its purpose was to automatically suppress increases in work capacity and power consumption in the high-speed rotation drive range by simply adding a simple configuration. The purpose of the present invention is to provide a gas compressor that has the following characteristics.

In order to achieve the above object, in the present invention, a long hole with a predetermined circumference is formed concentrically with the peripheral edge of the bearing part of the front side block of the gas compressor, and the long hole is engaged with and detachable from the side end surface of the vane. A slider that freely contacts and restricts the protrusion of the vane in the radial direction is fitted so as to be able to slide along its circumference, and an intake port is provided at the end of the slider that protrudes from the front side block. A pressure receiving plate is provided facing the vane and sliding the slider in response to the suction pressure, and a spring is provided at the other end of the slider to constantly urge the slider to the non-restricted position of the vane.

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

The figure shows a rotary gas compressor to which this idea is applied. This gas compressor includes a compressor main body 1,
The compressor includes a casing 2 with one end open surrounding a compressor body 1, and a front head 3 attached to the open surface of the casing 2.

The compressor body 1 includes a cylinder 4 having an elliptical inner circumference.
It has a front side block 5 and a rear side block 6 attached to both sides of the cylinder 4, and these form an elliptical cylinder chamber. A solid cylindrical rotor 9 equipped with two vanes 8 is horizontally suspended so as to be freely rotatable.

When the rotor 9 is rotationally driven in the direction of arrow A in FIG.
The low-pressure gas introduced from 0 passes through the circulation hole 11 formed in the front side block 5 and the circulation hole 12 formed in the cylinder 4, as shown by the solid line arrow in FIG. sucked into the room. In addition, the high-pressure gas compressed in the cylinder chamber is discharged from the discharge port 14 and the discharge valve 15 into the gap between the outer periphery of the cylinder 4 and the inner periphery of the casing 2. (not shown) to the oil separator 16 at the back of the block 6.
As shown by the broken line arrow in the figure, the liquid is discharged from the rear space of the casing 2 to the outside through the discharge port 17.

Next, the main parts of this idea will be explained.

At the periphery of the bearing portion 5a of the rotor shaft 7 of the front side block 5, there is a concentric elongated hole 20 (see Fig. 3) with a circumference extending from the minor axis to the major axis of the cylinder, that is, approximately 90 degrees. A ring-shaped groove 21 communicating with the elongated hole 20 is formed on the inner end surface of the front side block 5.
has been formed. A ring-shaped slider 22 is fitted into the groove 21 so as to be slidable therein.

A pair of arc-shaped engagement protrusions 23 are provided on the inside of the cylinder chamber of the slider 22 at positions facing each other at 180 degrees (see Fig. 2), and the other end of the slider 22 is An arc-shaped actuator 24 is integrally provided and extends through the elongated hole 20 and projects to the front surface of the front side block 5. A ring-shaped groove 25 is formed on the side end surface of the rotor 9 facing the engagement protrusion 23 and receives the engagement protrusion 23, and an engagement groove 26 of a predetermined width is formed at the side end of each vane 8. is formed.

At a position close to the intake port 10 of the actuator 24,
The pressure receiving plate 27 is mounted with screws 2 to face this intake port 10.
8, and one end of the other end of the actuator is engaged with a tension spring 29 attached to the front side block 5, and the biasing pressure of this tension spring 29 causes the actuator to constantly slide. The mover 22 is pressed against one end of the elongated hole 20.

In this case, each of the engaging protrusions 23 is fixed to the short diameter side in the cylinder chamber as shown by imaginary lines in FIG. The amount of protrusion of the vanes 8 is not restricted, and while the vanes 8 protrude radially into the cylinder chamber, the gas introduced into the working chamber surrounded by the vanes 8, the rotor 9, and the cylinder chamber is compressed as described above.

Next, when the rotor 9 is rotated at high speed, the intake port 1
The flow rate of the gas introduced from 0 becomes faster, and the gas introduced from the intake port 10 presses the pressure receiving plate 27,
As a result, the slider 2 resists the spring pressure of the tension spring 29.
2 moves along the elongated hole 20 to a position corresponding to the flow velocity on the longer diameter side of the cylinder chamber, and in conjunction with this, the end of the engagement protrusion 23 moves to the longer diameter portion of the cylinder chamber.
Therefore, the vane 8, which rotates and moves while slidingly contacting the engagement groove 26 with the engagement protrusion 23, has its protruding position regulated by the engagement protrusion 23, and its tip does not come into contact with the inner wall of the cylinder 4, but is kept at a predetermined gap. d is formed. Due to this leakage from the gap d, the gas is not compressed, and both the cooling capacity and the driving power are reduced. Note that the maximum width of the gap d can be set to an arbitrary value by adjusting the width of the engagement groove 26, and the compression ratio can be lowered according to the amount of leakage from the gap d.

Further, in the above embodiment, an engaging protrusion was formed on the slider 24 and an engaging groove was formed on the side end surface of the vane 4, but as shown in FIG. The same effect can be obtained even if an engaging groove 31 is formed in a protruding manner on the inner end surface of the ring-shaped slider 24 to receive the pin 30, and the groove width is partially changed.

As explained in detail in the embodiments above, according to this invention, the front side block is provided with a slider that slides according to the gas flow velocity, and the protrusion is achieved by engaging the slider with the vane. Since the engine is regulated, high-capacity compression work can be performed in the low speed range, and increases in work capacity and power consumption can be automatically suppressed in the high rotational speed range according to the flow rate of the gas on the intake side. Therefore, the present invention is suitable as a gas compressor for car coolers.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of this invention, and FIGS. 2 and 3 are the - line and - line in FIG. 1.
A line sectional view, and FIG. 4 is a partial sectional view showing another embodiment of this invention. 4...Cylinder, 5...Front side block, 6...Rear side block, 8...Vane,
9... Rotor, 13... Intake port, 14... Discharge port, 20... Long hole, 22... Slider, 23
...Engagement protrusion, 26...Engagement groove, 27...Pressure plate, 29...Tension spring, 30...Engagement pin, 31
...Engagement groove.

Claims (1)

[Scope of utility model registration request] A cylinder formed in a substantially oval cylindrical shape and having an intake port and a discharge port formed through it inside and out, and attached to both sides of the cylinder,
A plurality of vanes that can move forward and backward in the radial direction are installed in the cylinder chamber, which is composed of the front and rear side blocks each having an intake or discharge side circulation hole that communicates with each of the ports, and the cylinder and both side blocks. In a gas compressor in which a rotor is rotatably mounted horizontally, the front side block has an elongated hole of a predetermined circumference concentrically formed at the periphery of the bearing portion of the front side block, and the elongated hole is provided with an elongated hole having a predetermined circumference. A slider that removably abuts on the side end face of the vane to restrict the protrusion of the vane in the radial direction is slidably inserted along the circumference of the vane, and the slider is slidably inserted from the front side block of the slider. A pressure-receiving plate is provided at the protruding end of the blade to face the intake port and slide the slider in response to the intake air flow, and a spring is provided at the other end to constantly urge the slider to the non-restricted position of the vane. A gas compressor equipped with