JPH027273Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an oil separator for a compressor used, for example, in a vehicle cooling system.

(Prior art) As a conventional compressor of this type, for example,
A vane type rotary compressor as shown in FIGS. 7 to 7 is known. In the figure, reference numeral 1 denotes a bottomed cylindrical housing of a vane type rotary compressor, and a cam ring 2 made of a substantially elliptical cylinder is housed within the housing 1. The cam ring 2 is sealed at both ends with a front plate 3 and a rear plate 4. Furthermore, a substantially cylindrical rotor 5 is rotatably housed within the cam ring 2.
A plurality of slits 6 are formed in the rotor 5 in the radial direction, into which vanes 7 are fitted. A back pressure passage 8 is formed at the radially inner end (bottom) of the slit 6. When the rotor 5 rotates, the vane 7 protrudes from the slit 6 due to the centrifugal force of the rotor 5 and the pressure of lubricating oil in the back pressure passage 8, and the tip of the vane 7 comes into sliding contact with the cam surface 9 of the cam ring 2. When the vanes 7 rotate, adjacent vanes 7 define a pump chamber 10 in the cam ring 2 that sucks and compresses refrigerant. The high-pressure refrigerant compressed in the pump chamber 10 contains lubricating oil that seeps out from between the vanes 7 and the slits 6 in addition to the lubricating oil that it already contains. This compressed high-pressure refrigerant is delivered to the discharge port 1 of the cam ring 2.
1 and is discharged into a refrigerant passage 12 defined between the housing 1 and the cam ring 2. Refrigerant passage 12
The refrigerant discharged into the rear plate 4 flows out into the oil separator 14 through a discharge hole 13 formed in the rear plate 4. With this oil separator 14,
Lubricating oil is separated from the refrigerant until the refrigerant contains an appropriate amount, and the separated lubricating oil is stored in a lubricating oil reservoir 15 provided at the bottom of the housing 1. The refrigerant containing an appropriate amount of lubricating oil flows out from the discharge port 16 of the housing 1 into the cooling cycle, circulates, and flows again into the suction port 17 of this vane-type rotary compressor, lubricating each sliding part. was.

(Problem to be solved by the invention) However, in the oil separator 14 of such a conventional compressor, the separation performance for separating lubricating oil from refrigerant is set to match the high speed rotation of this compressor. Therefore, during low speed rotation, lubricating oil was separated from the refrigerant more than necessary. For this reason, the lubricating oil contained in the refrigerant is less than the appropriate amount, and when the refrigerant circulates through the cooling cycle and flows into the vane-type rotary compressor again, the refrigerant remains at each sliding part, such as the cam surface and the tip of the vane. There was a lack of lubricating oil, and oil films were running out on each sliding part. Therefore, the frictional heat generated in each sliding portion became excessive, causing the temperature of the compressor to rise abnormally. As a result, the durability of the vane type rotary compressor has decreased. Also, if this compressor becomes abnormal, a protection switch is activated, turning off the electromagnetic clutch and preventing rotational driving force from being transmitted to the rotor 5. Therefore, the vehicle cooling system does not operate properly, resulting in a problem of poor cooling.

(Means for Solving the Problems) In order to solve such problems, in the present invention, a refrigerant discharge hole is attached to the rear plate provided with the discharge hole so as to cover the discharge hole. In an oil separator for a substantially box-shaped compressor having a collision wall facing a hole, a movable wall is formed by the collision wall and an opening/closing wall adjacent to the collision wall and facing a discharge port to a refrigeration cycle. On the other hand, a fixed wall that swingably supports the movable wall is fixed to the rear plate, and an elastic member is provided to separate the opening/closing wall from the fixed wall, so that the liquid flows out from the discharge hole and hits the collision wall. When the outflow speed of the colliding refrigerant increases, the opening/closing wall contacts the fixed wall against the elastic force to prevent the refrigerant from directly flowing out to the discharge port.

(Function) When the compressor rotates at high speed, the refrigerant flowing out from the discharge hole into the oil separator pushes the collision wall against the elastic force because of its high outflow speed. The movable wall swings and the adjacent opening/closing wall is closed, and the oil separator with the opening/closing wall closed functions in the same manner as before.

On the other hand, during this low-speed rotation, the refrigerant flowing out from the discharge hole of the rear plate into the oil separator cannot push the collision wall against the elastic force because its outflow speed is slow. Therefore, since the opening/closing wall is open, a part of the refrigerant containing lubricating oil collides with the collision wall and mixes with the refrigerant from which the lubricating oil is separated, so that the appropriate amount of lubricating oil is distributed as a whole. The contained refrigerant passes through the opening of the opening/closing wall, circulates from the discharge port to the cooling cycle, and then flows into the compressor again. Each sliding part of the compressor is lubricated by lubricating oil provided by the inflowing refrigerant.

(Example) Hereinafter, an example of this invention will be described based on the drawings. 1 to 3 are diagrams showing an embodiment of this invention. First, the configuration will be explained. In describing this embodiment, the same components as those of the conventional example are given the same reference numerals, and the explanation thereof will be omitted. In the figure, two discharge holes 13a and 13b are formed in the rear plate 4, and a substantially box-shaped oil separator 21 is attached to cover the discharge holes 13a and 13b. The oil separator 21 consists of a fixed wall 21A and a movable wall 21B, and the fixed wall 21A has discharge holes 13a and 13b.
Two holes 31a and 31b are formed that match the
A front wall 32 adjacent to and juxtaposed with the rear plate 4
, side walls 24 and 25 adjacent to both sides thereof, and a lower wall 26 adjacent to the lower side.
On the other hand, the movable wall 21B consists of a collision wall 22 facing the discharge holes 13a and 13b, and an opening/closing wall 23 adjacent to the upper side of the collision wall 22.
Center hole 2 facing the center point of the discharge holes 13a, 13b
2a is formed, and the end face is joined to the opening/closing wall 23, so that the opening and closing wall 23 is integrally connected to have a substantially L-shaped cross section. The movable wall 21B is attached to the side walls 24, 25 so as to be swingable about the joint between the collision wall 22 and the opening/closing wall 23. Further, a tension spring 27 is provided between the rear plate 4 and the collision wall 22. Therefore, as shown in FIG. 1, the collision wall 22 is always pulled toward the rear plate 4, and the opening/closing wall 23 is open. On the other hand, when the collision wall 22 is pushed against the tension, the collision wall 22 swings counterclockwise until it comes into contact with a stopper wall 28 provided on the lower wall 26.
At the same time, the opening/closing wall 23 is closed. Also, the lower wall 26
Two slits 26a are formed in the. A baffle plate 29 is disposed below the slit 26a, and this buffle plate 29 is connected to the oil separator 21.
is attached to.

Next, the effect will be explained.

When the vane type rotary compressor rotates at high speed, the vanes 7 protrude from the slits 6 due to the centrifugal force and the pressure of the lubricating oil in the back pressure passage 8 as the rotor 5 rotates, and the tips of the vanes 7 are attached to the cam surface 9. sliding contact. The cam surface 9 and the sliding portion at the tip of the vane 7 are lubricated by the lubricating oil contained in the refrigerant sucked into the pump chamber 10 . At this time, the refrigerant contains lubricating oil that seeps out from between the vanes 7 and the slits 6 in addition to the lubricating oil that it already contains. The refrigerant compressed in the pump chamber 10 is discharged into the refrigerant passage 12, and further flows out into the oil separator 21 from the discharge holes 13a and 13b. The refrigerant flowing into the oil separator 21 collides with the collision wall 22 and pushes the collision wall 22 against the tensile force of the tension spring 27 because the refrigerant flows out at a high speed. The collision wall 22 is pushed and swings until its lower end abuts against the stopper wall 28,
At the same time, the opening/closing surface 23 also swings and closes. The refrigerant containing lubricating oil impinges on the impingement wall 22 and most of the lubricating oil is separated. The separated lubricating oil passes through the slit 6a and is stored in the lubricating oil reservoir 15, and the refrigerant from which most of the lubricating oil has been separated flows out into the housing 1 from the center hole 22a. At this time, the refrigerant contains an appropriate amount of lubricating oil. The refrigerant in the housing 1 circulates from the discharge port 16 to the cooling cycle, and from the cooling cycle again flows into the suction port 17 of the vane-type rotary compressor. An appropriate amount of lubricating oil brought by the refrigerant flowing into the vane-type rotary compressor lubricates the sliding parts of the cam surface 9 and the tip of the vane 7, preventing oil film from running out, and also prevents oil film from running out on other sliding parts. Cutting is prevented.

On the other hand, when a vane type rotary compressor rotates at low speed,
Oil separator 21 from discharge holes 13a and 13b
The refrigerant flowing out collides with the collision wall 22. However, since the outflow speed is slow, it is not possible to push the collision wall 22 against the tensile force of the tension spring 27. Therefore, the opening/closing wall 23 remains open. A part of the refrigerant containing lubricating oil flows out from this opening into the housing 1, and the other refrigerant collides with the impingement wall 22, and the lubricating oil it contains is separated. The separated lubricating oil is passed through the slit 26a.
The separated refrigerant is collected in the lubricating oil reservoir 15 through the lubricating oil reservoir 15 and flows out into the housing 1 through the center hole 22a. The refrigerant containing lubricating oil and the refrigerant from which the lubricating oil has been separated are mixed in the housing 1 to become a refrigerant containing an appropriate amount of lubricating oil. This refrigerant is circulated to the cooling cycle through the discharge port 16, and flows from the cooling cycle again into the suction port 17 of the vane-type rotary compressor. The appropriate amount of lubricating oil provided by the refrigerant flowing into the vane-type rotary compressor prevents the sliding parts of the cam surface 9 and the tips of the vanes 7 from running out of the lubricated oil film, and also prevents the other sliding parts from running out of the oil film. Prevented. Therefore, the frictional heat generated in each sliding portion is small, and the temperature of the vane-type rotary compressor does not rise much. As a result, the durability of the vane type rotary compressor is improved. Also, since the vane type rotary compressor does not reach a high temperature, the protection switch will not operate. Therefore, the vehicle cooling system operates, and the interior of the vehicle is cooled well.

In addition, this oil separator 21 has a collision wall 22 and an opening/closing wall 23 which are swingably attached to the side walls 24 and 25 and are constantly tensioned by a tension spring 27.
It is pushed according to the outflow speed of the refrigerant discharged from 3a and 13b. Therefore, the opening degree of the opening/closing wall 23 is
It will change depending on the outflow speed of the refrigerant. As a result, this oil separator 21 can separate excess lubricating oil from the refrigerant according to the rotation range of the vane-type rotary compressor, and can always make the refrigerant contain an appropriate amount of lubricating oil.

In addition, in the above embodiment, the rear plate 4
Although a tension spring 27 is provided between the collision wall 22 and the collision wall 22, a compression spring 30 may be compressed between the collision wall 22 and the stopper wall 28, as shown in FIG. This embodiment also operates in the same manner as the above embodiment.

(Effects of the invention) As is clear from the above explanation, according to this invention, refrigerant containing an appropriate amount of lubricating oil can be circulated throughout the rotation range of the compressor.
Each sliding part of the compressor is properly lubricated to prevent the oil film from running out. Therefore, the frictional heat generated in each sliding portion is small, and the temperature of the compressor does not rise much. As a result, the durability of the compressor is improved. Furthermore, since the protection switch that prevents the compressor from becoming too hot is not operated frequently, the vehicle cooling system operates and the interior of the vehicle is kept well cooled.

[Brief explanation of drawings]

1 to 3 are views showing an embodiment of an oil separator for a compressor according to the present invention, and FIG. 1 is a sectional view of a vane type rotary compressor to which this oil separator is attached, Figure 2 is the first
3 is a sectional view taken along the line 1-2, and FIG. 3 is a perspective view of the oil separator. FIG. 4 is a perspective view of an oil separator in another embodiment. Figures 5 to 7 are diagrams showing the oil separator of a conventional compressor. Figure 5 is a sectional view of a vane type rotary compressor to which this oil separator is attached, and Figure 6 is the same as that of Figure 5. 7 is a perspective view of the oil separator. 4...Rear plate, 13a, 13b...Discharge hole, 16...Discharge port, 21...Oil separator, 21A...Fixed wall, 21B...Movable wall, 2
2... Collision wall, 23... Opening/closing wall, 27... Tension spring (elastic member), 30... Compression spring (elastic member).

Claims (1)

[Scope of utility model registration request] In an oil separator for a substantially box-shaped compressor, the oil separator is attached to a rear plate provided with a refrigerant discharge hole so as to cover the discharge hole, and has a collision wall facing the discharge hole, the collision wall and the collision wall side. A movable wall is formed by an opening/closing wall adjacent to the opening/closing wall facing the discharge port to the refrigeration cycle, and a fixed wall that swingably supports the movable wall is fixed to the rear plate, and the opening/closing wall is fixed to the rear plate. An elastic member is provided to be spaced apart from the fixed wall, and when the outflow speed of the refrigerant flowing out from the discharge hole and colliding with the collision wall increases, the opening/closing wall resists the elastic force and moves toward the fixed wall. An oil separator for a compressor, characterized in that the oil separator is configured to abut against each other to prevent refrigerant from directly flowing out to the discharge port.