JPS63154869A - Variable capacity compressor - Google Patents

Abstract

PURPOSE:To enable direct detection of the degree of inclination of a wobble plate, by arranging many magnetic detection sensors while facing with a magnet arranged at the end of a slider. CONSTITUTION:A through bolt 202 is arranged in parallel with a shaft 115 in a cover housing 125. A slider 203 in coupled slidably on the through bolt 202 and coupled rotatably with a rolling board 103. A magnet 204 is arranged at the end portion of the slider 203 such that the center line connecting between N and S poles of said magnet 204 is aligned with the reciprocating direction of the slider 203. Furthermore, many magnetic detection sensors 206 are arranged at an open position of the reciprocal section of the slider 203 such that they will face directly with the magnet 204 through a predetermined gap. Consequently, the magnet 204 moves as the slider 203 reciprocates, and the reciprocal movement of the slider 203 can be detected directly by judging whether said motion of the magnet 204 is detected through a magnetic detection sensor 206.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a variable capacity compressor, and is effective for use as a refrigerant compressor in, for example, an automobile air conditioner.

[Conventional technology and its problems]

Conventionally, a so-called wobble type compressor has been known as a refrigerant compressor for automobile air conditioning, in which a piston reciprocates within a cylinder under the movement of a wobble plate that rotates and oscillates within a housing.

In addition, in this type of Urapull type compressor, a technique was known in which the reciprocating stroke of the piston was varied by variably controlling the inclination angle of the wobble plate, thereby variably controlling the discharge capacity of the compressor. (
(U.S. Pat. No. 3,861,829).

In this type of compressor, the capacity changes depending on the inclination angle of the wobble plate, but it has been very difficult to accurately control the inclination angle of the wobble plate. In other words, the inclination angle of the wobble plate is controlled according to the pressure in the pressure chamber within the housing, but it has been difficult to accurately control the pressure in the pressure chamber without delaying operation for the following reasons. .

There is an operation delay between the signal pressure being applied to the pressure chamber and the inclination angle of the wobble plate corresponding to the signal pressure, and it has been impossible to accurately grasp the operation delay.

Therefore, a non-contact large displacement detection device was required. However, conventional detection devices have not been able to satisfy such requirements.

For example, in the case of using a differential magnetoresistive element, the detectable range is extremely narrow (for example, about 311Il11), and it is impossible to detect large displacements. It is also possible to magnetize a fixed part facing the detected part, arrange a magnetic sensor to face it, and displace the magnetic sensor, but in that case, the wiring etc. will be complicated. ,for example,
It was impractical to use as a compressor for automobile air conditioning.

Furthermore, it is conceivable to use an optical sensor or the like as the position detection sensor, but it is virtually impossible to use this optical sensor in a member such as the compressor according to the present invention. That is, if an optical sensor or the like is used to detect positional displacement inside the compressor, the optical sensor must be placed inside the compressor. However, inside the compressor, there is lubricating oil for the compressor and friction powder generated from each sliding part of the compressor, and the presence of these substances may make the optical sensor virtually impossible to operate. It is from.

[Problem that the invention seeks to solve]

The present invention was devised in view of the above points, and is a variable capacity compressor in which the inclination angle of the wobble plate varies.
The purpose is to directly detect the inclination ratio of the wobble plate.

[Configuration and operation]

In order to achieve the above object, in the present invention, a through member is arranged in parallel with the shaft within a cover housing in which a wobble plate rocking plate and the like are arranged.

A slider is slidably connected to the through member, and the slider is rotatably connected to the rocking plate. The rocking plate performs rocking motion within the cover housing in response to the rotational rocking motion of the wobble plate, so the rocking motion of the rocking plate is transmitted to the slider, and the slider
will move back and forth on the through member.

A magnet is placed at the end of the slider so that the central axis connecting the north and south poles coincides with the reciprocating direction of the slider.

Further, a large number of magnetic detection sensors are arranged in parallel at the open position of the reciprocating portion of the slider so as to directly face the magnet with a predetermined gap therebetween. This magnetic detection sensor has magnetic detection surfaces of each sensor facing each other,
arranged in parallel.

With such a configuration, the magnet moves with the reciprocating movement of the slider, and the magnetic detection sensor can effectively detect the movement. In particular, since a large number of magnetic detection sensors are arranged in parallel, the amount of reciprocating movement of the slider can be directly detected by determining which magnetic detection sensor has detected magnetism.

In addition, in the present invention, since the amount of reciprocating movement is directly detected using a magnetic detection sensor, the amount of displacement can be detected well even in a space filled with lubricating oil, such as the inside of a compressor. It is.

〔Example〕

An embodiment of the compressor of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 111 denotes a cylinder housing made of aluminum alloy, in which cylinders 106 are formed in parallel at a plurality of locations. A piston is slidably disposed in each cylinder 106. Further, a rear housing 123 is connected to one end surface of the cylinder housing 111 via a pulp plate 114. A suction chamber lO7 and a discharge chamber 108 are formed within this rear housing. Note that a suction valve is formed on the surface of the valve plate 114 on the cylinder 106 side, and refrigerant gas in the suction chamber 107 can be sucked into the cylinder 106 side through this suction valve. On the other hand, the valve plate 114
Among them, a discharge valve 109 is connected to a portion on the discharge chamber 108 side with a bolt 140 together with the pulp cover 11O. This discharge valve 109 is a valve plate! 14
It opens and closes the discharge hole formed in the cylinder 1.
The refrigerant gas compressed in 06 is discharged from the discharge hole into the discharge chamber 108 via this discharge valve 109 .

A cover housing 125 is connected to the other side of the cylinder housing 111 via an O-ring 141. This cover housing accommodates drive members such as the wobble plate 101 inside. That is, a shaft 115 is rotatably disposed in this cover housing 125 and the aforementioned cylinder housing 111 via bearings 116 and 117, respectively. Further, the shaft 115 is connected to a rotor 118, and the shaft and rotor rotate together. Note that the load of the rotor 118 in the thrust direction is supported by a bearing 119. The wobble plate 101 receives the rotation of the rotor via the tongue A (temporary).

Since this wobble plate 101 can be tilted with respect to the shaft 115, the wobble plate 101 receives the rotation of the shaft 115 and performs a rocking motion accompanied with rotation within the pressure chamber 213. A swing plate 103 is rotatably connected to the wobble play 1-101 via a bearing 143. Therefore, of the rocking motion accompanying the rotation of the wobble plate, the rotational motion is not transmitted to the rocking plate 103, and only the rocking motion is transmitted to the rocking plate 103. Therefore, the swing plate 103 performs a swing motion within the pressure chamber 213. The rocking motion of the rocking plate 103 is transmitted to the piston 105 via the connecting rod 104. Connecting rod 10
Spherical connecting parts are formed at both ends of the rocking plate 1.
The oscillating movement of 03 is transmitted to the piston 10 via this connecting rod 104.
It is converted into a reciprocating motion of 5.

Note that since the wobble plate 101 and the rotor 118 are connected by the pin 1011, the inclination angle of the wobble plate can be changed as desired. Then, the reciprocating stroke of the piston 105 is varied depending on the inclination angle of the wobble plate 101. That is, when the inclination angle of the wobble plate is large, the swing width of the swing motion accompanying the rotation of the wobble plate 101 also becomes large. As a result, the reciprocating stroke of the piston 105 becomes large.

Conversely, when the inclination angle of the wobble plate 101 is small, the swing width of the swing movement accompanying the rotation of the wobble plate 101 is small. Therefore, in this state, the reciprocating stroke of the piston 105 becomes small. In this way, the reciprocating stroke of the piston 105 is variably controlled in accordance with changes in the inclination angle of the wobble plate lO9.

Also within the cover housing 125 is a shaft seal 14.
5 is disposed, and this shaft seal 145 prevents the refrigerant gas in the pressure chamber 213 from leaking outward along the shaft 115.

A hub portion 147 is formed in the center of the cover bousing 125, and an electromagnetic clutch (not shown) is disposed in the hub portion 147. Then, the rotational driving force of the car driving engine (not shown) is transmitted to the shirt l through an electromagnetic clutch.
-115.

Note that the inclination angle of the above-mentioned wobble plate lO1 is controlled by controlling the pressure within the pressure chamber 213. That is, if the pressure inside the pressure chamber 213 becomes high, a high pressure will be applied to the back surface of the piston 105, and this pressure will reduce the stroke of the piston 105 on the compression stroke side.

Conversely, if the pressure within 213 is lower, the pressure applied to the back surface of piston 105 will be lower, resulting in a longer compression stroke of the piston.

In this way, by controlling the pressure inside the pressure chamber 213, the amount of movement of the piston 105 (i.e., wobble play) is controlled.
The inclination angle of 101 will be controlled.

In this example, the pressure inside the pressure chamber 213 is controlled by the control valve 30.
1. The control valve 301 is formed in the rear housing 113 and receives the low pressure in the suction chamber 107 and the high pressure in the discharge chamber 10B, and adjusts the output pressure to the compression chamber 213.

That is, a 1ala valve 3°3 is formed in the control valve 301, and this solenoid valve 303 controls the opening/closing ratio of the passage 304 that leads high pressure from the discharge chamber 108, and outputs an output signal to the output passage 305. (Illustrated in Figure 9)
. The output passage 305 passes through the rear housing 113 and the cylinder housing 111, and the output passage 305 passes through the pressure chamber 213.
It will be communicated to.

The above-mentioned cover housing 125 and cylinder housing 1
11. The rear housing 113 has a plurality of through bolts 20
2 are integrally connected. A slider 203 is slidably connected to a through bolt 202 located at the lowest position in the housing. This slider is also rotatably connected to the swing plate 103 at the same time (
(Illustrated in Figures 2, 3, and 10).

That is, a through hole 2030 having a circular cross section is formed in the center of the slider 203, and the through bolt 202 passes through the through hole 2030. Further, a retaining pin 2031 is formed protruding from the side surface of the slider 203, and a shoe 2032 is attached to this engaging pin 2031.
The retaining hole 2033 fits therein. Therefore, slider 20
3 is Shu.

-2032, is rotatably connected. Further, the shoe 2032 is held in a sliding groove 2034 formed on the lowermost surface of the rocking plate 103 so as to be able to reciprocate. Therefore, the relative position change between the rocking plate 103 and the through bolt 202 during the rocking movement of the rocking plate 103 is caused by the shoe 20
32 reciprocating displacement and shoe 2032 and slider 203
The rotational displacement between the two allows for good release. here,
The slider 203 is connected to the through bolt 202 located at the lowest position in the pressure chamber 213 because it is located at the lowest position, so the pressure chamber 213 is filled with lubricating oil during the refrigeration cycle. , slider 2
03 and the through bolt 202, and the slider 20
This is to facilitate relative movement between the shoe 2032 and the shoe 2032, and further between the shoe 2032 and the sliding groove 2034 of the rocking plate.

A magnet 204 is connected to the bottom surface of the slider 203. The N and S poles of this magnet are formed in the same direction as the axis of the through bolt 202, so the magnetic flux 2041 of the magnet 204 is directed to the slider 202.
03 reciprocating direction and one defeat.

The magnetic detection sensor includes a printed circuit board 236 fixed on the sensor housing 207 and this printed circuit board 236.
It consists of Hall ICs 246 arranged on the top.

The sensor housing 207 is fixed to the cover bousing 125 with bolts 214 via a packing 208 and a seal washer 209. Also, Hall IC
246 are arranged so that a minute gap g is formed between them and the tip of the magnet 204. Note that this gap g is preferably between 0.5 mm and 1.5 mm, for example about 0.8 mm. Further, the slider 203 is fixed to a magnet housing 250 with a metal bond, and the magnet 204 is fixed by the magnet housing 250.

As shown in FIG. 4, the Hall IC has a rectangular parallelepiped shape with a side of 4 to 4.5 mm and a thickness of about 2 fflt11.

This Hall IC 246 has a magnetic detection surface 2461
is arranged so as to be perpendicular to the magnetic flux 2041. That is, a large number of Hall ICs 246 are arranged on the printed circuit board 236 such that the magnetic detection surface 2461 of one Hall IC 246 faces the magnetic detection surface 246I of the adjacent Hall IC 246.

By arranging the Hall ICs in this way, a large number of Hall ICs 246 are arranged in series in the thickness direction. Therefore, the maximum amount of Hall ICs in a given sensing surface
246 can be installed.

Next, the hole C246 that constitutes the magnetic detection sensor 206
I will explain it in detail. The Hall IC 246 has three terminals ■, ■, ■ as shown in Fig. 4, and the first terminal ■
A voltage (5■) supplied from the vehicle-mounted pantry via the converter is applied to the terminal (5), and the third terminal (2) is grounded to the body of the automobile. And Hall IC246
When the magnetic flux penetrates, the magnetic flux is detected and a predetermined voltage (5■) is output from the second terminal (2). Its internal structure is the fifth
It looks like the picture.

That is, a Hall element 501 is built into the Hall IC 246, and this Hall element outputs a voltage according to magnetic force. The output voltage is amplified by an amplifier 503 and then input to a Schmitt trigger 5.4. This Schmitt trigger divides the output voltage value into O and l. That is, when the supplied magnetic force is less than a predetermined value, a signal of 1 is output, and when the supplied magnetic force is greater than a predetermined value (for example, 500 Gauss), a signal of O is output. The output signal is then outputted to the second terminal (2) via the output stage 505. Note that a stable overcurrent a506 is provided between the Schmitt trigger 504 and the output stage 505.

FIG. 6 shows the characteristics of this Hall IC. When the applied magnetic flux density is less than a predetermined value (for example, 500 Gauss), the output tml is approximately 1, and when the applied magnetic flux density becomes higher than the predetermined value, the output voltage becomes 0 port. Hall IC246
FIG. 7 shows the digital circuit processing portion of the output signal. As described above, the Hall IC 246 outputs a pulse signal according to the magnetic flux. This pulse signal is sent to the one-shot IC401 for a predetermined period of time (for example, when the engine rotation speed in the idle state is set to 60 Orpm, and the pulley ratio is 1).
．． With 2 amplification, the minimum rotation of the compressor = 12H
z and set it to 90m5ec). This is because the slider 203 moves at high speed within the pressure chamber 213 as the shaft 115 rotates.
After the slider 203 passes through the first Hall IC 246, the slider 203 passes over the first Hall IC 246.
This is because it is necessary to hold the output voltage until .

The signal held for a predetermined time by the rc 401 is input to the encoder 403. Here Hall IC246
16 are arranged, and balls are inputted again. These eight types of signals are A. , A, , A2 into a 0.1 signal combination. The signal value converted into a 0.1 signal by encoder 403 is input to adder 404, where the signals from the two encoders are added. The value is converted into an analog signal by a D/A converter, and further passed through an amplifier 406 to an EC signal.
Supplied to U211.

FIG. 8 is a diagram showing the output signal amplified through amplifier 406. As is clear from FIG. 8, the detection circuit 400 linearly outputs an output signal corresponding to the signal from the Hall IC 246. Also Hall IC246
The empty signal detects the amount of reciprocating movement of the slider 203, and the amount of reciprocating movement of the slider also indicates the inclination angle of the one-pull plate 101. Therefore, the output signal from the detection circuit 400 represents the displacement of the compressor.

The ECU 211 converts the optimum discharge capacity of the compressor according to the signal from the detection circuit 400 and the signal from the air conditioner ECU 210. In other words, ECU210 for air conditioner
If a signal indicating that the cooling capacity is insufficient is input,
In response to this signal, an output signal that maximizes the discharge capacity of the compressor is output to the control valve 301. Then, the difference between the output control signal and the actual discharge capacity of the compressor is fed back using a signal from the detection circuit 400 to perform further optimal control.

That is, as shown in FIG. 9, in addition to the position detection sensor 206, the air conditioner ECU includes a pressure sensor 601 that detects the high-pressure side pressure of the refrigeration cycle, and a temperature sensor that detects the temperature in the room where cooling is required. A signal from an acceleration sensor 602 and an acceleration sensor 603 that detects the acceleration of an automobile engine that is a drive source of the compressor is input, and based on this signal, the optimum discharge capacity of the compressor is detected. Then, based on the calculation result, the duty ratio is varied, and the solenoid valve 3
The opening degrees of 01 and 303 are variably controlled. Especially this ECU
Since the target discharge volume based on the signal from the temperature sensor 602 etc. and the actual discharge volume based on the signal from the position sensor 206 are both input into 210, the optimum value can be quickly calculated by feedback control. be.

〔Effect of the invention〕

As explained above, in the compressor of the present invention, a through member is disposed within the pressure chamber, and a slider is slidably installed on the through member. Therefore, the lubricating oil or the like existing in the pressure chamber can smoothly lubricate between the slider and the through member.

Further, a magnet is arranged at the end of the slider so that its magnetic flux is in line with the direction of reciprocating movement of the slider, and a large number of magnetic detection sensors are directly arranged at positions facing the magnet. This magnetic detection sensor is arranged so that its magnetic detection surface is orthogonal to the direction of magnetic flux. Therefore, according to the compressor of the present invention, a large number of magnetic detection sensors can be installed in series in the thickness direction. Therefore, it is possible to most efficiently arrange a large number of magnetic detection sensors in a predetermined position detection surface.

Further, in the variable capacity compressor of the present invention, since the variable amount can be directly detected by the magnetic detection sensor, capacity variable control can be performed most accurately and quickly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the compressor of the present invention, Fig. 2 is a sectional view showing the main parts of the compressor shown in Fig. 1, and Fig. 3 is a sectional view showing the main parts of the compressor shown in Fig. 1. 4 is a perspective view showing the Hall IC, FIG. 5 is a circuit diagram inside the Hall IC, FIG. 6 is a characteristic diagram showing the output characteristics of the Hall IC, and FIG. 7 is a compressor shown in FIG. 1. FIG. 8 is a graph showing an output signal of the detection circuit shown in FIG. 7. Fig. 9 is a block diagram showing the operation of the solenoid valve shown in Fig. 1;
This figure is a perspective view showing the holding structure of the slider shown in FIG. 1. 101... Wobble plate 105... Piston. 106...Cylinder, 111...Cylinder housing. 125...Cover housing, 118...Rotor,
119... Pin, 103... Rocking plate, 213...
pressure chamber. 206... Magnetic detection sensor, 203... Slider. 204...Magnet, 246...Hall IC.

Claims (3)

[Claims] (1) A cylinder housing having a plurality of cylinder parts formed parallel to each other, a cover housing connected to this cylinder housing and forming a pressure chamber therein together with the cylinder housing, and rotatably disposed within this cover housing. a rotor that rotates integrally with the shaft; a wobble plate that is swingably connected to the rotor via a pin and swings and rotates within the pressure chamber in response to rotation of the shaft; a rocking plate rotatably supported by a plate via a bearing and rocking within the pressure chamber in response to only rocking motion of the rotational rocking motion of the wobble plate; and a rocking plate slidably disposed within the cylinder portion. a connecting rod connecting the piston and the rocking plate, a through member disposed in the pressure chamber in parallel with the shaft, and a through member slidably connected to the through member and the rocking plate. a slider rotatably connected to a movable plate and reciprocating on the through member in response to the rocking motion of the movable plate; A magnet whose connecting center line coincides with the direction of reciprocating movement of the slider, and a large number of magnetic detection sensors disposed so as to directly face the magnet at the opening position of the reciprocating movement part of the slider with a predetermined gap therebetween. A variable capacity compressor, characterized in that the plurality of magnetic detection sensors are arranged such that magnetic detection surfaces of the respective magnetic detection sensors face each other. (2) The variable capacity compressor according to claim 1, wherein the magnetic detection sensor is a Hall IC including a Hall element, an amplifier, and a Schmitt trigger. (3) The variable displacement compressor according to claim 1, wherein the through member is disposed at a lowermost portion of the cover housing.