JPS6022094A - Compression capacity variable mechanish in slide vane type compressor - Google Patents

Abstract

PURPOSE:To reduce the rise-up torque of the compressor upon starting by a method wherein a pressure damper chamber is provided on the way of a communicating hole communicating with a high pressure chamber and a low pressure chamber provided at both ends of a spool for controlling a bypass. CONSTITUTION:A pair of pressure chambers, consisting of the high pressure chamber 20 and the low pressure chamber 21, are provided opposingly at both ends of the spool 19 for opening and closing a main suction port 30. Second pressure introducing port 23 is extended from the high pressure chamber 20 so that the end 23' thereof is faced to a compression chamber 6 under a compression stroke, while the second pressure introducing port 23 is provided with the pressure damper chamber 25. The first pressure introducing port 24 is extended from the low pressure chamber 21 and is provided with the pressure damper chamber 26 at the intermediate position thereof.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a compression chamber in a slide vane compressor:)i
l' DJ change mechanism, more specifically, a suction hole or a bypass hole that connects the suction chamber and the compression chamber is provided so that it can be automatically opened and closed via the pressure difference that occurs in the compressor as the cooling load changes in the vehicle interior, By regulating the amount of refrigerant gas supplied to the compression chamber through the opening and closing action of the suction hole,
Alternatively, the present invention relates to a variable compression capacity mechanism that is provided to control the compression capacity by releasing a part of the refrigerant gas that is in the middle of compression into the suction chamber through the opening and closing action of a bypass hole.

Prior art In conventional slide vane type compressors, as a method to prevent overcooling in the vehicle interior, the suction hole that communicates the suction chamber and the compression chamber is divided into a main suction hole and a sub suction hole, or the compression chamber and the A method of varying the compression capacity by providing a bypass hole that communicates the suction chamber and automatically opening and closing the main suction hole or the bypass hole in accordance with changes in the cooling load in the vehicle interior, and more specifically, a method for varying the compression capacity of the compressor. The pressure difference that occurs within the compressor during operation, that is, the pressure obtained in the suction stroke in the suction chamber or compression chamber (suction stroke pressure Pt), and the pressure obtained in the compression stroke in the compression chamber 4? pressurepH
) The amount of refrigerant gas supplied to the compression chamber can be regulated by automatically opening and closing the main suction hole or bypass hole using changes in thread pressure that occur between A method has been proposed to release the gas into the inhalation chamber.

FIG. 8 is a drawing showing the specific structure of the method for regulating the amount of refrigerant gas supplied to the compression chamber, in which the suction hole communicating between the suction chamber and the compression chamber (6) is the main suction hole (10Ai
It is divided into sub-intake holes (IOB). The auxiliary suction hole (IOB) is provided so as to be always open, and the main suction hole (IOA) is provided so as to be openable and closable by a control valve tf4f121. and the control valve mechanism (12
1 corresponds to the main suction hole (IOA) - A spool (1 duck) is provided so as to be able to move forward and backward, and at both ends of the spool (191) there are compression chambers (6) during the compression stroke (compression stroke pressure PH).
A high pressure chamber (201) communicating with the compression chamber (6
) (I suction stroke pressure PL) is provided facing the low pressure chamber (21) which communicates with the low pressure chamber (21). Also, a spring (2 bottles) is interposed in the low pressure chamber (1), and the spring (spool α9) is biased toward the high pressure chamber (2o) and the main suction hole (I
OA) is provided so as to be in a state of occluding it.

In the variable capacity mechanism, at startup or in a state where the cooling load in the passenger compartment is small, the compression stroke pressure p
ii and the suction stroke pressure PL becomes lower than the biasing pressure of the spring (22), so that the spool (1!j
is urged toward the high pressure chamber (20) and the main suction hole (I
A state in which the OA) is blocked, that is, a small capacity operation state is obtained,
In addition, when the cooling load in the vehicle interior is large, the pressure difference generated between the compression stroke pressure PH and the suction stroke pressure PL exceeds the biasing pressure of the spring (221), causing the spool (the biasing pressure of the spring (221) to A state in which the pressure is overcome and the low pressure chamber (20) is pushed out and the main suction hole (IOA) is opened, that is, a 100% operating state is obtained, but as mentioned above, the compression chamber (20) is (6) A method of deriving the compression stroke pressure pl (in the compression chamber (6), that is, as the pressure on the high pressure side
) The method that utilizes the pressure within ) has the following problems.

■When the compressor is started, the refrigerant gas sent in the previous operation remains in the compression chamber (6), so compression starts at the same time as the electromagnetic clutch is turned on. However, in this way, the O of the electromagnetic clutch
Since compression starts at the same time as N, the suction pressure temporarily and rapidly decreases at startup, and the compression stroke pressure Pyr and suction stroke pressure P1. Between/:1
- The differential pressure ΔP increases rapidly (see FIG. 9), and the differential pressure ΔP exceeds the set load of the spring (a) at the same time as the electromagnetic clutch is turned on. In other words, the electromagnetic clutch is ON
At the same time, the main suction hole (IOA) is opened, and the engine enters 100-speed operation at the same time as startup, making it impossible to reduce the start-up torque at startup.

(2i) During steady operation, the pressure inside the compression chamber (6) constantly fluctuates due to the rotating action of the vanes (8). As the pH is guided to the high-pressure chamber wall, pressure fluctuations occur in the high-pressure chamber even in the cram school (see FIG. 10), and this pressure fluctuation causes vibrations in the spool 01, which generates abnormal noise.

OBJECTS OF THE INVENTION The present invention is an attempt to improve the conventional situation as described above, and an object of the present invention is to reduce the start-up torque at the time of starting the compressor.

Structure of the invention That is, the present invention provides a high pressure chamber and a low pressure chamber facing each other at both ends of a spool that opens and closes a main suction hole or a bypass hole, and the high pressure chamber is communicated with a compression chamber during a compression stroke through a pressure guiding hole. ,
In the variable compression capacity mechanism, the low pressure chamber is provided so as to communicate with the compression chamber during the suction stroke through the pressure guiding hole.In the variable compression capacity mechanism, a pressure damper chamber is provided in both the above-mentioned heart pressure holes, and the compression pressure at the time of startup is adjusted to the same pressure damper chamber. In other words, by making the spool pool in the spool, there is enough time between when the electromagnetic clutch is turned on and when the spool starts moving in the direction of opening the main suction hole or closing the bypass hole. Then, by keeping the main suction hole closed or the bypass hole open for a while while the electromagnetic clutch is turned on, small capacity operation can be obtained.
The main feature of this system is that it prevents a sudden rise in start-up torque at startup by providing a system in which 100% operation is achieved after passing through this small capacity operation state. The gist of the invention is to provide a spool that can move forward and backward in correspondence with a main suction hole that communicates between the suction chamber and the compression chamber or a bypass hole that communicates between the compression chamber and the suction chamber, and a high pressure chamber and a low pressure chamber at both ends of the spool. are placed facing each other, and the spool is always biased toward the high pressure chamber. ! , VC is provided, and the high pressure chamber communicates with the compression chamber during the pressure aii stroke through the pressure guiding hole,
The low-pressure chamber is connected to the compression chamber during the suction stroke through the pressure-conducting hole, and in the capacity IIJ transformer 41, a pressure damper chamber is provided in the middle of both of the pressure-conducting holes. It is in.

EXAMPLES Specific examples of the present invention will be described below with reference to illustrative drawings. In each drawing shown in FIGS. 1 to 5, (
1) shows a housing that constitutes the outer shell of the compressor. The housing (1) is formed by a front housing (IA) and a rear housing (IB), and the front housing (IA) has a cylinder block (2) on both sides with the cylinder block (2) in between. Front side grate (3A) and rear side plate (3B)
The cylinder block (2) into which the cylinder block (2) is fitted is formed into a hollow cylindrical shape with openings at both the front and rear ends, and the inner wall surface of the hollow part has a cylindrical shape concentric with the outer peripheral surface of the cylinder block (2). It is formed. The front and rear openings of the cylinder block (2) are shielded by the side plates (3A) and (3B), and a drive shaft (4) is horizontally mounted between the side plates (3A and 3B).

The drive shaft (4) is provided with its center line offset relative to the cylinder block (2), and a rotor (5) is integrally fixed to the drive shaft (4). Same rotor (5)
is provided so that a part of its outer circumferential wall can slide against the inner wall surface of the cylinder block (2), and the four rotors (5)
(7) A honey contraction chamber (6) is formed between the outer peripheral wall and the inner wall surface of the cylinder block (2). Also rotor (
7+1 has 4 vanes (8)... are the compression chamber (6+5
IL0 and each vane (8) are inserted so that they can appear and retract freely.
... divides the compression chamber (6) into four compression blocks,
Each compression block is provided so as to rotate within the compression chamber (6) while continuously moving from the suction side to the discharge side. A part of the cylinder block (2) is cut out at a position corresponding to the end of the compression chamber (6) in the direction of rotation of the rotor (5), and the inner wall surface of the front housing (IA) is A discharge chamber (131) is formed between the discharge chamber (131) and the discharge chamber (131).
13) and the terminal end of the compression chamber (6) are communicated through a discharge hole (14). (151 is a discharge valve 1 that covers the discharge hole (4). (16) is a retainer that regulates the opening angle of the discharge valve (15). On the other hand, the front housing (I
An r1 suction chamber (9) is provided between the front side plate (3A) and the front side plate (3A), and the suction chamber (9) has a suction port (9) connected to the suction pipe (not shown) on the front housing (IA) side. )' is provided with the same suction chamber (9) and the compression chamber (
6) are communicated by a suction hole, which is divided into a main suction hole (IOA) and a sub-suction hole (, 19, 13). That is, the main suction hole (IOA) is passed through the front sight full 1/-1 (3A) and is connected to one end of the compression chamber (6).
More specifically, the compression chamber is provided so as to face the position where the suction operation is completed when it is almost fully depleted, and the auxiliary intake hole (IOB) is located between the front side plate (3A) and the cylinder block (2). ) is provided so as to be located further toward the starting end (top position) than the main suction hole (IOA).

The above-mentioned sub-intake hole (IOB) is provided so as to be in constant communication, while the main suction hole (IOA) is provided with a control valve mechanism (
I2) so that it can be opened and closed freely. In other words, inside the front side gray) (3A) is a spool (19) for opening and closing the main suction hole (IOA) that intersects with the main suction hole (IOA).
) is provided to be movable forward and backward, and a pair of pressure chambers consisting of a high pressure chamber t20+ and a low pressure chamber (21) are provided facing each other at both ends of the spool (19). A spring (221) is interposed in the low pressure chamber (21), and the spool (11υ) is normally biased toward the high pressure chamber (20) through the spring 4 to close the main suction hole (IOA). A second pressure guiding hole (C) is extended from the high pressure chamber (C), and its tip (pressure detection part (231') is connected to the compression chamber (6) during the compression stroke. ), and the second pressure guiding hole (23) has a pressure damper chamber (23) located at an arbitrary intermediate position.
A gloss is provided. That is, the 24th hole (23) is the pressure guiding hole (
23a) and a pressure conducting hole (23b), the high pressure chamber (20)
The tip of the pressure guiding hole (23a) that extends further is the pressure damper chamber (25) carved in the front side play (3A).
) is installed so that it communicates with the Pressure damper = chamber (25)
is formed with an appropriate volume, and the same pressure damper chamber (2
5) The tip of the pressure guiding hole (23b) (pressure detection part ta:sy) extending from the compression chamber (6) during the compression stroke as described above.
).

Also, a first pressure guiding hole (24) is extended from the low pressure chamber (21), and its tip (pressure detection part (incorporated)') is provided so as to face the compression chamber (6) during the suction stroke. 1st pressure hole (2a)
has a pressure dunnosis chamber (2ii) at any intermediate position.
is provided.

That is, the first pressure hole (24) is connected to the pressure hole (24a) and the pressure hole (
24b), and the tip of the pressure guiding hole (24a) extending from the low pressure chamber (21) is the front side grate (3A).
The pressure damper chamber C(:) is provided so as to communicate with the pressure damper chamber C(:) carved therein.

The pressure damper chamber (2G) is the pressure damper chamber (2G).
The tip of the pressure guiding hole (24b) extending from the same pressure chamber (2G) is formed to have an appropriate volume similar to 51 (the pressure detecting section (24 is the sub suction hole (), OB ) is installed so as to face the opening position of the

On the other hand, the rear housing (IB) has a rear side play) (
A lubricating oil separation chamber is formed between the lubricating oil and the lubricating oil.

The separation chamber θG is provided so as to communicate with the discharge chamber 03) through a through hole (not shown) opened in the carrier side plate (3B). A filter (not shown) is provided at the opening of the through hole, and a lubricating oil reservoir separated by the filter is provided in the separation chamber Q71.

Also in the same separation chamber (17) is the rear housing (IB).
A discharge port [1] connected to a discharge pipe (not shown) is provided on the side.

Next, its effect will be explained.

At the time of startup, the electromagnetic clutch is turned ON, and at the same time, the refrigerant gas remaining in the compression chamber (6) from the previous operation is compressed, so that the pressure in the compression chamber (6) increases rapidly at the same time as the startup. . And like this, the compression chamber (6
), the pressure difference between the compression stroke pressure PH and the suction stroke pressures P and L suddenly increases, along with the temporary drop in suction pressure during startup. - However, in the present invention, the high pressure chamber (2i11) and the compression chamber (6) during the compression stroke are
2nd pressure hole (23+,” and low pressure chamber (21+) connecting between
) and the compression chamber (6) during the suction stroke.
! 4) each has a pressure dunnosis chamber (25!4 provided) 1
．． By doing so, the electromagnetic clutch is turned off at startup.
A small capacity operating state is obtained for a certain period of time after the N is turned on, and after this small capacity operating state, an effect of switching to 1()0% operation is obtained. That is, in the compression chamber (6), the pressure that suddenly increased during the compression stroke and the pressure that suddenly decreased during the suction stroke at the same time as startup are detected by the side pressure detection unit (2: ++' (2
41', the compression stroke pressure PH and the suction stroke pressure PL [7] are detected in the second lip pressure hole (2:11 and the first pressure guiding hole (24)) into the high pressure chamber (20) and the low pressure chamber (21). ) direction, but the second pressure hole (231
A pressure damper chamber (25;
) and the first pressure hole c! 4) The compression stroke pressure 71PtI and suction stroke pressure P'L in the auxiliary pressure damper chamber (25i (2
(by being pooled in the second pressure hole (23
) and the effect of temporarily suppressing sudden changes in pressure within the first pressure guiding hole (24). That is, a hyperbaric chamber (2tll
In the low-pressure chamber 011 and 011, the differential pressure therebetween does not change suddenly as in the compression chamber (6), but gradually increases. In other words, the sudden pressure change in the compression chamber (6) at the time of startup is suppressed by the auxiliary pressure damper chamber (2!it (2G
), a relaxing effect can be obtained. Then, the pressure in both the positive cardan bar chambers (251 (2G)) is detected by the side pressure detection part (23
In the state where the pressure increases to the same level as the pressure at f(24)', the side pressure detection section (compression stroke pressure PH detected at 231'(24+') and suction stroke pressure PI
, will be guided directly to the high pressure chamber (20) and the low pressure chamber (21), but the set load of the spring (22) will be applied to the side pressure damper chamber (25j (2 [iJ) By setting the same level as the pressure in the side pressure detection part (2:(l'(24+'), the pressure in the sub-pressure damper chamber (251(2)
A small-capacity operating state can be obtained while the pressure in the side pressure detection section (G) reaches the same level as the pressure in the side pressure detection section (2: 24+'. In other words, the electromagnetic clutch is ON
A certain amount of time can be secured between the time when the load exceeds the set load of spool 01 and spring 22 and the main suction hole (IOA) is opened (see Figure 6). By obtaining a small capacity operating state for a certain period of time at startup, in other words, at the same time as startup, 10
100% after going through a small capacity operation state without becoming 0% operation
By switching to J operation, more specifically, by starting in small capacity operation at the time of startup, it is possible to prevent a sudden rise in the start-up torque at the time of startup (ξ)
(See Figure 7).

In addition, the dynamic pressure detection part (2:(+'(24+)
The compression stroke pressure PH and suction stroke pressure PL detected at ' are transferred to the pressure damper chamber (2!it (2fj
By pooling them in the compression chamber (6), it is possible to effectively absorb pressure fluctuation waves (see FIG. 10 2) generated due to the rotation of the vanes (8). By absorbing the pressure fluctuation waves in this way, it is possible to prevent the vibration of the spool (1H) and to prevent the generation of abnormal noise caused by the vibration.

In the above embodiment, the suction hole is divided into a main suction hole and a sub-suction hole, and a variable capacity mechanism is described in which the main suction hole is provided so that it can be opened and closed freely. It is also possible to use a variable capacity mechanism having a structure in which a communicating bypass hole is provided and the bypass hole is provided so as to be openable and closable.

Effects of the Invention The present invention is constructed as described above, and as described above, a high pressure chamber and a low pressure chamber are provided facing each other at both ends of the spool that opens and closes the main suction hole or the bypass hole. The compression chamber during the compression stroke is communicated with the compression chamber during the compression stroke through the pressure guiding hole, and the low pressure chamber is communicated with the compression chamber during the suction stroke through the pressure guiding hole, and both groove holes are provided with pressure damper chambers in the middle. The compression stroke pressure P and suction stroke pressure PL are pooled in both positive damper chambers to temporarily suppress sudden changes in the compression stroke pressure PH and suction stroke pressure PL, and to reduce the dynamic pressure in the high pressure chamber and the low pressure chamber. In other words, the pressure in the high-pressure chamber and the low-pressure chamber is gradually increased.
By starting the compressor (1-) to allow time for the spool to operate, a small capacity operating state can be obtained for a certain period of time after the electromagnetic clutch is turned on. In other words, by switching from small capacity operation to 100% operation at startup, it has become possible to prevent a sudden rise in start-up torque when the stain magnetic latch is connected.

Further, in the present invention, a pressure damper chamber is provided as described above,
By absorbing the pressure fluctuation waves generated in the compression chamber in the pressure damper chamber, vibration of the spool can be prevented and abnormal noise caused by vibration of the spool can be prevented. I was able to do it.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the compressor according to the present invention (A-B-C line sectional view in Fig. 2) -
3 is a sectional view of the front side plate portion, 4 is an enlarged view of the variable capacity mechanism, 5 is a sectional view taken along line E-'E in 3, and 6 is a differential pressure FIG. 7 is a graph showing changes in the start-up torque. FIG. 8 is a sectional view of a compressor showing a conventional structure, and FIG. 9 is a graph showing changes in the static torque. FIG. 10 is a dimensional graph showing pressure fluctuations in the compression chamber. (11 housing, (IA) front housing, (I
B) Rear housing, (3) cylinder block, (3)
A) Front side plate, (3B) Rear side plate, (4) Drive shaft, (5) Rotor, (6) Compression chamber, (8) Vane, (9) Suction chamber, (9)' Suction port, (I
OA) Main suction hole, (10B) Sub-suction hole, (12) Control a
ll Valve contact m, (131 discharge"M, o4) discharge hole, (1
5) Discharge valve, (16i 1J CH-1 (17)
Separation chamber, (17t' discharge port, (141 spool, (2o
) high pressure chamber, (21) low pressure chamber, (221 spring, (23) second pressure detection hole, (23+' pressure detection section, (24) first pressure detection hole, (24)' pressure detection section, (25) (2[i) Pressure damper chamber. Patent applicant Toyota Industries Corporation Fig. 1 D Fig. 2 Δ Fig. 5 Fig. 4 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10

Claims (1)

[Claims] (1) A spool that controls the opening and closing of the main suction hole that communicates between the suction chamber and the compression chamber or a bypass hole that communicates between the compression chamber and the suction chamber is provided in correspondence with the main suction hole that communicates between the suction chamber and the compression chamber. A high pressure chamber and a low pressure chamber are provided facing each other, and the spool is provided so that it is always biased toward the high pressure chamber, and the high pressure chamber is communicated with the compression chamber during the compression stroke through a pressure guiding hole. , a variable capacity mechanism in which the low pressure chamber is provided so as to communicate with the compression chamber during the -C suction stroke through a pressure guiding hole, and a slide vane type compressor in which a pressure damper chamber is provided in the middle of both of the pressure guiding holes. Compression capacity variable mechanism.