JPS58128487A - Rotary compressor - Google Patents

Abstract

PURPOSE:To simplify the consturction of a volume controlling device for a vane type compressor by providing a plurality of bypass holes in a compressor body to sequentially open and close the bypass hole group with a spool provided slidably in a cylinder hole intersecting the bypass hole. CONSTITUTION:In a side plate 120 are provided in parallel three bypass wedges 122-124 causing a working chamber 140 entering the volume reducing step to communicate to an intake pressure chamber 151, and provided a cylinder hole 170 intersecting these bypass holes. In the cylinder hole 170 is slidably provided a spool 180 which moves in the cylinder hole 170 to sequentially open and close the bypass holes 122-124 so that the construction of volume controlling device for a vane type compressor can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary compressor, and particularly to a flexible capacity rotary compressor useful as a refrigerant compressor for an automobile cooler system.

A rotary compressor for compressing refrigerant used in an automobile cooling system generally compresses engine fuel through an electromagnetic clutch.
connected to the link pulley. For this reason, the compressor is 7OO~
It is used in a wide rotation speed range of 6000 rpm.

However, the compressed IO capacity is mainly designed to exhibit sufficient cooling capacity at low speeds, and the Ka cooling capacity tends to be excessive at high speeds or low heat loads.

As described above, if the cooling capacity is excessively high, the pressure of the compressor decreases, causing a problem that the compression ratio becomes large and the efficiency of the compressor decreases, resulting in poor fuel efficiency of the automobile.

For this reason, in the past, the cooling was controlled by detecting the cabin temperature peak and turning on and off the electromagnetic clutch, but since the electromagnetic clutch repeatedly turned on and off during driving, The problem has been that the load applied to the engine fluctuates, causing the vehicle to accelerate or decelerate, resulting in a poor driving feeling.

In addition, since the Tala system is started and stopped by turning on and off the electromagnetic clutch, there has been a problem in that the temperature of the air to be cooled fluctuates greatly and the cooling and cooling sensation deteriorates.

For this reason, a nine-turn compressor with a built-in capacity adjustment device is being proposed for use in automobile cooler systems.
In addition, since the heat load varies greatly from high heat load in midsummer to low heat load in early spring, the discharge capacity can be varied over a wide range, and the capacity can be changed as continuously as possible. Moreover, there is a demand for a variable capacity rotary compressor that is small and has a simple structure.

The purpose of the present invention is to provide a rotary compressor that can meet the above-mentioned demands.The present invention has several bypass holes arranged in parallel in the compressor body to communicate the working chamber that has entered the volume reduction stage with the suction chamber. A cylinder 6 is provided to intersect with these bypass holes, and the large KfII cylinder is movable.By configuring the bypass holes to be opened and closed in sequence, the cylinder is small and simple. This configuration is characterized by being able to vary the discharge volume continuously and over a wide range.

Hereinafter, embodiments of the present invention will be described with reference to the first page.

1st Ii! This figure shows the first embodiment of the present invention. In the figure, 100 is a compressor main body, and the compressor main body 100 is equipped with a cylinder 110 having a cylindrical inner part 11111. , the rear opening end Fi is covered by the two sides [120, 130, respectively. A cylindrical rotor 200 is installed in the liner 110 so as to be rotatable eccentrically, and a rotating shaft 210 formed integrally with the rotor 200 has a bearing 22.
It is rotatably supported by the side plates 120 and 130 via 0 and 230.

The rotor 200 has four slits 201 formed approximately radially, and a vane 2 in each slit 201.
40 is inserted so that it can move forward and backward. The space between the liner 110 and the rotor 200 is divided into four working chambers 140K by four bars 7240, and each working chamber 1
Reference numeral 40 indicates a suction port 12 on the side plate 120 which changes its volume while moving with the rotation of the rotor 200.
1 is formed, and the liner 110 has a discharge port 111 that opens toward the working chamber 140 that has reached the minimum volume stage.
is formed.

A housing 150 is disposed in close contact with the outer surface of the side plate 120.
and liner 110 are fixed together by a bolt (not shown). A suction pressure 11151 is formed between the housing 150 and the side plate 120, and a suction pressure chamber 15! is communicated via the suction port 121 with the operating chamber 140 in the customer volume increase stage. The housing 150 has a suction pressure chamber 1
A suction port 152 communicating with 51 is formed. One end of the rotating shaft 210 of the rotor 2000 extends to the outside through the housing 150), and is adapted to receive the driving force of the automobile engine through an electromagnetic clutch (not shown). A round seal member 153 is provided between the rotating shaft 210 and the housing 15G to prevent compressed fluid and lubricating oil from flowing out along the rotating shaft 210K.

A housing 160 is attached to the housing 110, and a discharge pressure IE 161 is formed in the housing 160.The discharge pressure chamber 161 reaches the minimum volume stage through the discharge port 111 during operation 1! 140K, there is a discharge valve 162 in the discharge pressure chamber 161.
and a stop collar 163 for regulating the opening stroke of the #i unloading valve 162. Housing 160KFi
Discharge pressure 16! A discharge boat 164 is formed which communicates with the discharge boat 164 .

The side plate 120 has three bypass holes 122 that communicate the working chamber 140, which has entered the volume reduction stage, with the suction position 151.
, 123 and 124 are provided in parallel.
These bypass holes 122°123.12 are provided in the side plate 120.
A cylinder hole 170 intersecting with 4 is provided.

A spool 180 is slidably provided in the cylinder hole 170, and as the wrinkled spool 180 moves within the cylinder hole 170, the bypass hole 122° 123.1
24 are opened and closed in sequence.

Here, the diameter or cross-sectional area of the bypass holes t22, 12L124t) gradually increases in the rotational direction of the rotor 200.
When 22, 123, and 124 are opened and closed in sequence, it is activated*
A spool 180K is connected to the piston 1 through a rod 181, and the effective compression volume of 14G is increased or decreased by the buried volume.
82 are integrally connected, and an O-ring 183 for sealing is installed in the outer peripheral groove of the piston 182. ?
A suction pressure introduction chamber 171 is formed between one end of the cylinder 6 170 and the spool 180, and this suction pressure introduction chamber 171
is communicated with the suction pressure chamber 151 via a passage (not shown). On the other hand, the other end of the cylinder hole 170 has an atmosphere communication hole and a nine cap 172 is attached to it.
An atmosphere inlet 1!173 is formed between the piston 72 and the piston 182. t, middle yag 172 and piston 182
A compression spring 174 is disposed between them, and the spring force of the ζO spring 174 biases the spool 180 in the direction of opening the bypass holes 122-124.

Next, the operation of the rotary compressor having the above structure will be explained with reference to FIGS. In addition, in FIG. 3(2) to @, the rotor 200 is assumed to rotate clockwise (in the direction of the arrow).

H-)2001! When rotated according to the engine output, etc.
Compressed fluid is sucked into the working chamber 140 from the suction port 121, while the compressed fluid is discharged from the discharge port 0111. , No. 38! ! 1(A)K, the spool 180 connects all the bypass holes 122 to 12.
1 when 4 is closed. The discharge amount of compressed fluid is 17
240 passes through the suction port 121 and is confined in the working chamber 140 after traveling, becoming the amount vl of the traveling compressed fluid.

On the other hand, as shown in FIG. 3(B)K, when the bypass hole 122 is open and the bypass holes 123 and 124 are closed, the actual discharge amount of the fluid to be compressed and the vane 240 exceed the bypass hole 122. Immediately after passing through, the amount of compressed fluid trapped in the working space 140 becomes V.

Similarly, in the states shown in FIG. 3 1) and FIG. 4 (2), the actual discharge amount of the compressed fluid is as follows. The amount of compressed fluid trapped inside and traveling through V, # V4, etc.
Ru.

As is clear from FIG. 3 (4) to (2), as the bypass holes 122 to 124 open sequentially, the amount of compressed fluid increases.
The discharge amount decreases gradually (Vt>Va>Vm>Va
).

In this embodiment, the positions and hole diameters of the bypass holes 122 to 124 can be determined as appropriate;
If the discharge amount (maximum discharge amount) Vs in the state of 113 (2) is set to 1, then the discharge amount V in the O state (Fig. 3) is 4, The discharge amount V in the state of FIG. 3(C) can be set to 1/1, and the discharge amount v4 in the state of FIG. 3(2) to be 4. I felt embarrassed,
As the spool 1800 moves, the compressed fluid 0fi1. The output amount can be changed continuously and over a wide range H.

Stool 180 a Suction pressure introduced @ 171,
It moves in response to changes in suction pressure. That is, when the suction pressure is above a certain level, the spool 18G compresses the spring 174 to close all the bypass holes 122 to 124.
1JK is maintained, and as the suction pressure 1 decreases, the spool 18G sequentially opens the bypass holes 122 to 124.

11 When the rotary compressor according to this embodiment is used as a refrigerant compressor for an automobile cooler system, when the heat load of the cooler system is high, that is, when the temperature inside the vehicle is high, the pressure inside the evaporator (not shown) will decrease. As the pressure increases, the suction pressure of the single-rotation compressor also increases.

This rounding, spool 180 Hapai bus hole 124-122
are sequentially closed, the discharge amount from the compressor increases, and the cooling capacity increases. On the other hand, when the heat load decreases or when the compressor is operated at high speed, the pressure inside the evaporator decreases and the compression lie@input pressure also decreases. For this reason, the bypass holes 122 to 124 of the spool 180Fi are sequentially opened, and the discharge amount from the compressor decreases, resulting in a decrease in cooling capacity.

In a cooler system that uses 70 N R12 as a refrigerant,
The pressure inside the evaporator is approximately 1.8K above the evaporator's freeze protection.
It is preferable to use it at t151'' or higher, but it should be used at least when it falls below about 1.7 Kg/cs''. Therefore, in this embodiment, when the suction pressure is 1.7 to 4/am'' or less, all the bypass holes 1
1 spring 17 so that all bypass holes 122 to 124 are opened and all bypass holes 122 to 124 are closed when the diameter is 1.8□51" or more.
During the spring load of 4, the spool 180 and the piston 1820
Pressure receiving area etc. are set.

As a result of the above, in this example, the discharge capacity is reduced to 1 for small fluctuations in suction pressure of 1.8 to 1.71 cf/as''K.
It is possible to change the INK over a wide range of ~1/4 and almost continuously, and by performing cooling commensurate with the heat load without reducing the cooling feeling during driving, it becomes 11 degrees.

In addition, although it is also possible to provide 91 slit-shaped bypass holes along the fiK% cylinder hole 170 for arranging the plurality of O bypass holes 122 to 124 in parallel, it is possible to use this slit-shaped bypass hole to In some cases, when the vane passes through the slit-like bypass hole, the refrigerant in the working chamber on the high-pressure side of the vane passes through the wrinkled slit-like bypass hole and flows through the slit-like bypass hole.
If a large amount leaks into the working chamber on the low pressure side, the compression efficiency of the rotary compressor will be greatly reduced. However, in the present invention, such a problem does not occur because a plurality of bypass holes are arranged in parallel.

On the other hand, it is also possible to make the bypass hole 0 diameter larger and provide only one location, but in this case, the compression efficiency will not be reduced as in the case of the slit-shaped bypass hole described above, and the minute surface movement of the spool will be avoided. However, the rounding controllability becomes extremely poor as the capacity saving increases. However, in the actual W14, such a problem does not occur.

FIG. 5 shows a second embodiment of the present invention.

In this figure, the same reference numerals are attached to the same components as those in the above embodiment.

In this embodiment, the open end of the cylinder hole 170 is blind a17! Cylinder hole 170 is closed with S.
The interior is divided by a spool 180 into a suction pressure introduction chamber 176 and a discharge pressure introduction chamber 177.
A compression spring 178 is disposed within 6 for biasing the spool 18G in the direction of opening the bypass holes 122-124. Note that between the outer layer of the spool 180 and the cylinder hole 170, there is a passage from a discharge pressure introduction chamber 177 to a suction pressure introduction chamber 176.
A gap exists that allows leakage of the compressed fluid to.

The discharge port 111 and the discharge pressure introducing chamber 177 form a pressure guiding passage 179.
A solenoid valve 300 as a control valve is provided in the middle of the pressure guiding passage 171.

In this embodiment, when the solenoid valve 300 is operated to open the pressure guiding passage 179, discharge pressure is introduced into the discharge pressure introduction chamber 177, and the spool 1110 moves against the spring 178, thereby creating a bypass. Holes 124-122 are closed in sequence. On the other hand, the pressure guiding passage 17 is
9 is closed, the pressure in the discharge pressure introduction*177 leaks into the suction pressure introduction chamber 176 through the gap between the spool 18G and the cylinder hole 170, and approaches the suction pressure. Therefore, the spool 18G is pushed by the spring 178 and moves to sequentially open the bypass holes 122 to 124.

FIG. 6 shows nine examples of applying the compression shown in FIG. 6 to an automobile cooler system.
The refrigerant discharged from 164 is condensed -3
Heat is generated when communicating 10, and then the receiving liquid 11B2
G and expansion valve 330 into the evaporator 340>, the evaporator 340 absorbs external heat and the compressor body 1000@
152.

A temperature sensor 350 is provided near the evaporator 340 to detect the temperature of the air to be cooled that has passed through the evaporator 340 (temperature on the outlet side). solenoid valve 300 by 360
is controlled on and off. That is, when the heat load on the coolant stem is high and the temperature on the outlet side of the evaporator 3400 is higher than the set value, the solenoid valve 300 is turned on and the control circuit 360 (which receives the signal from the sensor 350) turns on the The pressure passage 179 is opened and discharge pressure is introduced into the discharge pressure introduction chamber 177. When this happens, the spool 180 moves in a direction that compresses the spring 178, sequentially closing the bypass holes 124-122.

Therefore, the compressor is operated at maximum displacement.

On the other hand, when the temperature of the outlet of the evaporator 3400 becomes lower than the set temperature, the solenoid valve 300 is turned off and the pressure guiding passage 17 is turned off.
9, the pressure in the discharge pressure introducing chamber 177 gradually approaches the suction pressure, and the spool 180 is pushed by the spring 178 and moves, gradually opening the bypass holes 122 to 124.
Therefore, the discharge capacity of the compressor decreases. In this way, when the discharge capacity of the compressor decreases, the temperature on the outlet side rises within a relatively short period of time and becomes equal to or higher than the set value, so that the discharge capacity of the compressor increases again.

The above-described cycle is actually repeated in a short period of time, and the compressor according to this embodiment can also perform cooling commensurate with the heat load.

In the above two embodiments of the present invention, three bypass holes are arranged in parallel, but depending on the case, two or four or more bypass holes may be arranged in parallel.

(9) It is preferable that the bypass hole has a circular cross section in terms of workability, but the same effect can be obtained even if the bypass hole has a cross section other than circular.

Further, the minimum discharge capacity of the compressor is not limited to -, but may be, for example, inclusive or 4. In short, it can be arbitrarily determined depending on the usage status of the cooler system.

As described above, the present invention provides several bypass holes in parallel in the compressor body that communicate the working chamber that has entered the volume reduction stage with the suction chamber, and connects these bypass holes to the cylinder. The large part is slidable on the six spools, and the nine spools are arranged so that the pass holes can be opened and closed sequentially. Moreover, it becomes possible to provide a rotary compressor that can change the discharge capacity over a wide range.
If used as a refrigerant compressor for an automobile cooler system,
This means that you can save energy and get a comfortable cooling and driving feeling.

[Brief explanation of the drawing]

Figure 1 shows a first embodiment of the rotary compressor according to the present invention, and is a cross-sectional view taken along line 1-1 in Figure 2. Figure 2 is a cross-sectional view taken along line 1-1 in Figure 1. Figure, Figure 3 (
4) to (b) are schematic sectional views similar to FIG. 1 showing the operating state of the #i1 embodiment, respectively, FIG. 4 is a diagram showing the operating characteristics of the first embodiment, and FIG. This shows a second embodiment of the rotary compressor, and l
A sectional view similar to Fig. Ih1, and Fig. 6 are configuration diagrams showing an example in which the compressor according to the second embodiment of the present invention is applied to an automobile cooler system.・Raina, 120
．． 130--Side plate, 122.123.124--Bypass hole, 140--
- Working chamber, 15G - Housing, 151 - Suction pressure chamber, 161 - Discharge pressure chamber, 170 - Cylinder size, 180
-Spool, 200-...Rotor, 240-Vane, 3
00... Solenoid valve (control valve). Patent applicant Japan Auto Parts Research Institute Co., Ltd. Nippondenso Co., Ltd. Patent application ceremony Patent attorney for hire Akira Aoki Patent attorney Kazuyuki Nishioka Patent attorney Kuniaki Nishioka Patent attorney Akiyuki Yamaguchi Figure 1 1 ■ Figure 2 72 0 31st! I (A) (B) (C)
(D) 504- 41st! l 1A) (B) (C) (DlFigure 5Figure 6lU

Claims (1)

[Scope of Claims] 1. A working chamber that repeatedly changes volume while moving as the compressor rotates with 10-ta rotation, and a suction pressure that enters the R floor where the number of customers increases and is communicated with the 9th working chamber. In a nine-rotary compressor, the working chamber reaches the stage 11 with the smallest volume and communicates with the discharge pressure chamber. A plurality of bypass holes are provided in parallel to communicate with the royal family, cylinder holes are provided intersecting these bypass hole groups, and a spool slidably provided in the cylinder hole is used to sequentially connect the bypass hole groups. A rotary compressor characterized by being able to open and close. 2. The cross-sectional area of the bypass hole group gradually increases in the rotational direction of the rotor, and when the bypass hole group is sequentially lIw5 with the spool, the effective compression volume of the working chamber increases. 2. The O-press rotary compressor according to claim 1, wherein the O-pressure rotary compressor is configured to increase and decrease in quantity. 3. The rotary compressor according to claim 1, wherein the spool hole is adapted to move within a cylinder hole in accordance with changes in suction pressure of the rotary compressor. 2. The rotary compressor according to claim 1, wherein the discharge pressure is guided to the spool via a control valve.