JPH0533741Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotation detection device for detecting the rotation of a vane compressor.

(Prior art and its problems) Vane type compressors have the advantage of being compact and are used in car air conditioners and other air conditioners. In general, a vane type compressor includes a cylinder, a rotor having a vane that is eccentrically disposed inside the cylinder and slidably fitted in the cylinder so as to be able to move forward and backward so as to come into sliding contact with the inner circumferential surface of the cylinder, and a side that seals both ends of the cylinder. The refrigerant refrigerant in a compression chamber formed between the inner circumferential surface of the cylinder and the outer circumferential surface of the rotor is compressed by vanes as the rotor rotates. Such a compressor is connected to a power source such as an internal combustion engine through a connecting means such as an electromagnetic clutch and is driven to rotate.

By the way, the vane type compressor having the above structure has many contact rotating parts due to its structure, and it is essential to maintain airtightness at each contact part and reduce wear. On the other hand, due to slipping of the electromagnetic clutch, etc., the engine driving speed and the actual rotor speed do not match, making it impossible to accurately detect the compressor rotation. Difficult to control well. Furthermore, if the compressor rotates at an abnormally high speed for some reason even though the amount of compressed refrigerant is low, the oil film may run out and the rotor may seize.

Further, a detector for detecting the rotation of a vane type compressor is disclosed in, for example, Utility Model Application No. 58-32618 and Utility Model Application No. 58-24723.
It is disclosed in the publication No. However, each of these detectors detects the rotational state of the rotor based on the change in magnetic flux when the vane crosses the magnetic flux from the magnetic sensor, and the accuracy of rotation detection is low.

(Purpose of the invention) The present invention was made in view of the above circumstances, and it is possible to accurately detect the rotation of the compressor, for example, to control the cooling system with precision, and to prevent abnormal high-speed rotation of the compressor. It is an object of the present invention to provide a rotation detection device for a vane type compressor that can prevent and eliminate problems such as rotor seizure.

(Means for Solving the Problems) In order to achieve the above object, the present invention accommodates a pump housing in a compressor case, and in the pump housing, rotation of a rotor causes the inner circumference of the pump housing to be compressed. A pump chamber defined by a rotating vane in sliding contact with a surface is provided, a discharge pressure chamber communicating with the pump chamber via a discharge port is provided between the compressor case and the pump housing, and a discharge pressure chamber is provided in the discharge pressure chamber. In a vane compressor equipped with a discharge valve that opens during a discharge stroke and opens the discharge port, a detector that detects a rotational state of the rotor by detecting an opening operation of the discharge valve in the compressor case. It is configured to include.

(Function) The opening operation of the discharge valve is detected by the detector, and the rotation speed of the rotor is detected based on the predetermined number of opening and closing operations of the discharge valve per one rotation of the rotor and the number of detections by the detector. It is something.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

Fig. 1 shows a longitudinal section of a vane type compressor to which the rotation detection device according to the present invention is applied, and in the figure, 1 is a compressor case, and this compressor case 1 is a cylindrical case body with one end closed. A front head 4 is fitted onto the other end of the head 2 via an O-ring 3. A pump housing 5 is housed within the compressor case 1, and the pump housing 5 is formed by sandwiching a cylinder 8 between side blocks 6 and 7.

A rotor 10 fitted on a rotating shaft 9 is rotatably housed in the pump housing 5, and a plurality of slits 11 are formed along the radial direction of the rotor 10 and at equal intervals in the circumferential direction. A vane 12 is inserted into the slit 11 of the vane 12 so as to be able to move forward and backward, and the pump is A chamber 13 is defined.

The rotary shaft 9 is supported by the support portions of the side blocks 6 and 7 via bearings 14, and the tip of the rotary shaft 9 seals a shaft seal chamber 15 provided in the front head 4 airtightly with a seal member 15a. It penetrates while being held.

A suction pressure chamber 16 is provided between the front head 4 and the side block 6, and this suction pressure chamber 16 communicates with an intake port 17. Also, suction pressure chamber 1
6 communicates with the suction side of the pump chamber 13 via the first and second suction ports 18a.

Cover members 19 are fixed to the outer surface of the pump housing 5, and these cover members 19
A discharge valve chamber 20 is defined by the pump housing 5 and the outer surface of the pump housing 5. A plurality of discharge ports 21 are provided at predetermined intervals on the bottom surface 22 of these discharge valve chambers 20, that is, on the cylinder 8 of the pump housing 5.
It communicates with the pump chamber 13 via 1.

A discharge valve 23 is provided on the bottom surface 22 of the discharge valve chamber 20.
and the valve retainer 24 are connected to the bolt 25 together with the mounting seat 19a of the cover member 19 at one end.
It is tightened by.

As shown in FIGS. 3 and 4, the discharge valve 23 is provided with a plate-shaped valve body 26 corresponding to each of the four discharge ports 21, for example, and the intermediate plate-shaped valve body 26' has two discharge ports. It has a wide shape that spans 21.

Further, the valve retainer 24 has a retainer portion 27 corresponding to each plate-shaped valve body 26 of the discharge valve 23, but the intermediate retainer portions 27 are independent, and between these two intermediate retainer portions 27, A wide plate-shaped valve body 26' in the middle of the discharge valve 23 is exposed below.

The discharge valve chamber 20 communicates with a discharge pressure chamber 29 via a discharge pipe 28, and the discharge pressure chamber 29 communicates with a discharge port 30.

The cylindrical case main body 2 is provided with a sensor mounting portion 31, and a mounting hole 32 of the sensor mounting portion 31 is provided.
An eddy current gap sensor 33 serving as a detector is screwed into the mounting hole 32, and an O-ring 34 is mounted in the mounting hole 32.
is installed to maintain airtightness.

An electromagnetic pick-up 35, which is a detection part of the gap sensor 33, passes through the case member 19 via a seal member 36, and the tip surface 37 of this pick-up 35 does not come into contact with the discharge valve 23 even when the discharge valve 23 is at its maximum lift. in position.

Next, the operation will be explained.

When the rotating shaft 9 is rotated by an engine or the like and the rotor 10 is rotated, the tip of the vane 12 slides into contact with the inner circumferential surface of the cylinder 8, and during the suction stroke in which the volume of the pump chamber 13 gradually expands, refrigerant gas is pumped into the suction port 17. and into the suction pressure chamber 16. This refrigerant gas enters the pump chamber 13, is compressed in the compression stroke to reduce the volume of the pump chamber 13, pushes open the discharge valve 23 in the discharge stroke, is discharged from the discharge port 21 into the discharge valve chamber 20, and is discharged into the discharge pressure chamber. 29 and is sent from the discharge port 30 to the refrigerant gas circulation system.

The discharge valve 23 opens the same number of times as the number of vanes 12, for example, five times per revolution of the rotor 10. The gap sensor 33 detects this opening operation of the discharge valve 23 and generates a pulse signal.

That is, when the discharge valve 23 is opened, the wide plate-shaped valve body 26' of the discharge valve 23 rises and approaches the end face of the pickup 35 of the gap sensor 33, so that the gap sensor 33 generates a pulse signal. Therefore, the gap sensor 35 is connected to the rotor 1.
Since pulse signals are generated five times per rotation of the rotor 10, the number of rotations of the rotor 10 can be detected by counting the number of generated pulse signals.

(Effects of the Invention) As detailed above, the rotation detection device for a vane compressor according to the present invention accommodates a pump housing in the compressor case, and in the pump housing,
A pump chamber defined by a vane that rotates in sliding contact with the inner peripheral surface of the pump housing as the rotor rotates is provided, and a discharge port is provided between the compressor case and the pump housing and communicates with the pump chamber via a discharge port. In a vane type compressor, which is provided with a pressure chamber and a discharge valve that opens in the discharge stroke and opens the discharge port in the discharge pressure chamber, by detecting the opening operation of the discharge valve in the compressor case. The present invention is characterized in that a detector is provided to detect the rotational state of the rotor.

Therefore, the detector can detect the opening operation of the discharge valve and detect the rotation speed based on the number of opening operations of the discharge valve and the number of opening operations of the discharge valve per rotation of the rotor. Highly accurate rotation speed detection becomes possible.

Since the rotation of the compressor can be detected accurately in this manner, it is possible to control the air conditioning system with high precision, and it is also possible to eliminate problems such as rotor seizure accidents.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a vane compressor equipped with a rotation detection device according to the present invention, and FIG.
3 is a sectional view along the line, FIG. 3 is a view taken from the direction of FIG. 2, and FIG. 4 is a plan view of the discharge valve. 1... Compressor case, 5... Pump housing, 10... Rotor, 11... Vane, 13...
Pump chamber, 23...Discharge valve, 33...Gap sensor, 35...Pickup.

Claims (1)

[Scope of utility model registration request] The pump housing is housed inside the compressor case,
A pump chamber defined by a vane that rotates in sliding contact with the inner circumferential surface of the pump housing as the rotor rotates is provided in the pump housing, and a pump is discharged into the pump chamber between the compressor case and the pump housing. In a vane compressor, a vane type compressor is provided with a discharge pressure chamber that communicates through a port, and a discharge valve that opens during a discharge stroke and opens the discharge port in the discharge pressure chamber. A rotation detection device for a vane compressor, characterized in that a detector is provided for detecting the rotational state of the rotor by detecting its operation.