JP2002242835A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas compressor suited to improve a refrigerating cycle performance and the durability of the gas compressor. SOLUTION: An oil return channel 22 is provided in a delivery chamber 19, and the oil return channel 22 has an upper end opened to the bottom part side of an oil separation filer 23 and a lower end opened under the liquid surface of an oil sump 24. The oil drip separated and caught by the oil separation filer 23 is recovered in the oil sump 24, passing through only the oil return channel 22 physically completely separated and being independent from the inside of the delivery chamber 19 so that oil drip sweeping-up phenomenon by a delivery jet flow of high-pressure refrigerant gas is prevented. As a result, the oil quantity taken out to a high pressure part side of an air conditioning system along with the high-pressure refrigerant gas is drastically reduced, and oil retaining capacity of the gas compressor is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor constituting a refrigeration cycle of a car air conditioner system and the like, and more particularly, to increasing the oil holding capacity of the gas compressor and reducing the oil circulation rate of the refrigeration cycle. Thus, the performance of the refrigeration cycle and the durability of the gas compressor can be improved.

[0002]

2. Description of the Related Art A refrigeration cycle of a car air conditioner system or the like contains oil used for lubrication of sliding parts of a gas compressor in addition to refrigerant. In the gas compressor, the low-pressure refrigerant gas supplied from the low-pressure part (evaporator) side of the refrigeration cycle is compressed and discharged as high-pressure refrigerant gas to the high-pressure part (condenser) side of the refrigeration cycle. If the gas is supplied to the high-pressure section of the refrigeration cycle while containing a large amount of oil, various problems such as a decrease in the performance of the refrigeration cycle and a decrease in durability due to poor lubrication of the gas compressor occur. Therefore, the conventional gas compressor employs a structure in which an oil separator is provided inside the oil compressor, oil is separated from the high-pressure refrigerant gas by the oil separator, and the oil is dropped into the oil sump at the bottom of the discharge chamber and collected. are doing.

[0003] Specific oil separation methods in the above-mentioned oil separator include, for example, a method utilizing the effect of centrifugal separation by introducing a high-pressure refrigerant gas into a cylindrical passage and turning it, and a baffle plate. Some use the effect of collision between the so-called baffle plate and the high-pressure refrigerant gas. In addition, this type of oil separator can be provided at the discharge chamber side opening end of the discharge passage for guiding the high-pressure refrigerant gas from the compression mechanism to the discharge chamber, and the outlet of the gas compressor, that is, the discharge chamber and the refrigeration cycle. It can be provided at the discharge chamber side opening end of the discharge port connecting to the high pressure part side, or at both parts thereof. JP-A-9-60591 discloses an example in which an oil separator is provided near a discharge port.
As shown in (1), an oil separator 21 including a tubular oil separation filter 23 is mounted near the discharge port 20.

However, according to the conventional oil separator 21 as described above, as shown in FIG. 4, the oil separated from the high-pressure refrigerant gas is dropped by gravity onto the oil sump 24 at the bottom of the discharge chamber 19. The oil once separated and captured by the oil separator 21 is wound up by the discharge jet of the high-pressure refrigerant gas while dropping to the liquid surface of the oil sump 24, and is again formed into fine oil droplets from the discharge port 20. The oil for lubrication, etc., cannot be sufficiently retained in the gas compressor, and as a result, the oil circulation rate of the refrigeration cycle increases, As the performance decreases, the lubricating oil supplied to the sliding parts of the gas compressor becomes insufficient, and the durability of the gas compressor decreases.

In particular, the vicinity of the discharge port 20 is a place where the flow velocity of the high-pressure refrigerant gas is high due to the limitation of the cross-sectional area of the port passage and the separated oil is easily lifted up. In the case of the structure provided with the heater 21, the amount of oil taken out together with the high-pressure refrigerant gas to the high-pressure side of the refrigeration cycle via the discharge port 20 is large, the oil separation effect is small, and the oil for lubrication or the like is gaseous. It is even more difficult to keep it well in the compressor.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to increase the oil holding capacity of a gas compressor and reduce the oil circulation rate of a refrigeration cycle. Accordingly, an object of the present invention is to provide a gas compressor suitable for improving the performance of a refrigeration cycle and improving the durability of the gas compressor.

[0007]

In order to achieve the above object, the present invention provides a suction chamber in which an oil-containing low-pressure refrigerant gas is introduced from a low-pressure portion of a refrigeration cycle through a suction port.
A compression mechanism for inhaling and compressing the oil-containing low-pressure refrigerant gas introduced into the suction chamber into high-pressure refrigerant gas; a discharge chamber for discharging the high-pressure refrigerant gas from the compression mechanism; And an oil separator comprising an oil separation filter for separating oil from high-pressure refrigerant gas discharged into the discharge chamber, wherein the separated oil is
The high-pressure refrigerant gas, which has been dropped into the oil sump at the bottom of the discharge chamber and has been oil-separated, flows out of the discharge chamber to the high-pressure unit side of the air conditioner system via a discharge port, and enters the oil separation chamber into the discharge chamber. An oil return passage having an upper end opened on the bottom side of the filter and a lower end opened below the liquid level of the oil reservoir is provided.

The present invention is characterized in that the oil return passage comprises a pipe extending from the bottom side of the oil separation filter to a level below the oil reservoir.

The present invention is characterized in that the oil return passage comprises a vertical hole extending from the bottom side of the oil separation filter to the inside of the wall of the discharge chamber and reaching below the liquid level of the oil reservoir. .

[0010] The present invention is characterized in that the oil separator comprises an oil separation filter directly attached to an opening end of the discharge port on the discharge chamber side.

According to the present invention, the oil separator includes a separation chamber located immediately below the discharge port and communicates with the discharge port, and an oil separation filter is installed on a part of a side wall of the separation chamber. Structure, the upper end of the oil return passage,
An opening is provided at the bottom of the separation chamber.

The present invention has a discharge passage for discharging high-pressure refrigerant from the compression mechanism side to the discharge chamber side, and has an oil separation different from the oil separator at an opening end of the discharge passage on the discharge chamber side. A container is attached.

In the present invention, since the inside of the oil return passage is physically completely separated from and independent of the chamber of the discharge chamber, the discharge jet of the high-pressure refrigerant gas discharged into the discharge chamber is returned to the oil return path. It does not act inside the passage. Also,
Since the lower end of the oil return passage is opened below the liquid level of the oil reservoir, the oil droplets separated and captured by the oil separation filter do not directly pass through the discharge chamber in which the discharge jet of the high-pressure refrigerant gas acts once, The oil is collected in the oil reservoir through only the oil return passage.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas compressor according to the present invention will be described below in detail with reference to FIGS.

The gas compressor of the present embodiment shown in FIG.
The compressor mechanism 2 is housed in a compressor case 1 which is open at one end. A front head 3 is attached to an open end of the compressor case 1, and a suction chamber 4 is provided inside the front head 3. Suction chamber 4
, A low-pressure refrigerant gas containing oil is introduced from the low-pressure part side of the refrigeration cycle, for example, the evaporator side of the car air-conditioning system via the suction port 5 of the front head 3.

The compression mechanism section 2 is a mechanism that draws in oil-containing low-pressure refrigerant gas introduced into the suction chamber 4 and compresses it to produce a high-pressure refrigerant gas. Although considered various, in the present embodiment employs the vane rotary type compression mechanism for compressing using a vane.

That is, the compression mechanism 2 of the present embodiment includes a cylinder 6 having a substantially elliptical inner circumference.
The side blocks 7, 8 are respectively attached to both end faces. Thus, a pair of left and right side blocks 7,
A rotor 9 is disposed inside the cylinder 6 disposed between the rotor shaft 8 and the rotor 9. The rotor 9 has a rotor shaft 10 provided integrally with its axis and both side blocks 7, 8 supporting the rotor shaft 10. Are rotatably provided via a bearing (not shown).

As shown in FIG. 2, the rotor 9 is formed with five slit-shaped vane grooves 11 cut in the radial direction, and one vane 12 is slidable in each of the vane grooves 11. These five vanes 1
Numerals 2 are provided so as to be freely protruded and retracted from the outer peripheral surface of the rotor 9 toward the inner wall of the cylinder 6.

Inside the cylinder 6, the inner wall of the cylinder 6, the side blocks 7 and 8, the outer peripheral surface of the rotor 9 and the vane 12
It is divided into multiple compartments by both sides on the tip side,
The partitioned small chamber is the compression chamber 13, and the compression chamber 13 repeats a change in the size of the volume as the rotor 9 rotates in the direction of arrow A in the drawing.

In the compression mechanism 2 of this embodiment having the above-described configuration, the rotation of the rotor 9 causes the compression chamber 1 to rotate.
When the volume of the suction chamber 4 changes, the suction chamber 4
The low-pressure refrigerant gas inside is sucked into the compression chamber 13 through the suction passage 14 such as the cylinder 6 and the suction ports 15 of the side blocks 7 and 8. Then, when the volume of the compression chamber 13 starts to decrease, the compression of the refrigerant gas in the compression chamber 13 is started due to the volume reduction effect. Thereafter, when the volume of the compression chamber 13 approaches the minimum, the pressure of the compressed high-pressure refrigerant gas causes
The reed valve 17 of the cylinder discharge hole 16 formed in the vicinity of the cylinder elliptical minor diameter portion opens, whereby the high-pressure refrigerant gas in the compression chamber 13 is discharged to the cylinder discharge hole 16 and the discharge chamber 18 in the cylinder external space. You.

The high-pressure refrigerant gas discharged from the compression mechanism section 2 to the discharge chamber 18 as described above further flows into the discharge chamber 1.
The high-pressure refrigerant gas is discharged from the discharge chamber 19 to the high-pressure side of the refrigeration cycle through the discharge port 20 of the compressor case 1.

That is, the gas compressor of the present embodiment has a discharge port 20 as a port for supplying high-pressure refrigerant gas from the discharge chamber 19 to the high-pressure section of the refrigeration cycle. Of the discharge chamber 19
The discharge port 20 is connected to the high pressure side of the refrigeration cycle at the other end.

The discharge chamber 19 is formed of a space formed between the sealed end of the compressor case 1 and the rear side block 8, and an oil separator 21 and an oil return passage 22 are provided in the discharge chamber 19. ing.

The oil separator 21 comprises a cylindrical oil separation filter 23 formed of a wire mesh or a porous sintered metal or the like. The upper end of the cylinder of the oil separation filter 23 is open toward the opening end of the discharge port 20 on the discharge chamber side, and the lower end of the cylinder of the oil separation filter 23 is located at the bottom of the discharge chamber 19. Oil sump 2
4 are arranged so as to open. The oil separation filter 23 having such a configuration is provided as means for separating oil from high-pressure refrigerant gas discharged into the discharge chamber 19.

The oil return passage 22 is configured such that its upper end opens to the bottom side of the oil separation filter 23 and its lower end opens below the liquid level of the oil sump 24. In forming the oil return passage 22 having such a passage structure,
In the present embodiment, a straight pipe 25 extending from the bottom of the oil separation filter 23 to below the level of the oil sump 24 is used. In the case of this pipe structure, the upper end of the pipe 25 is at the bottom (cylindrical lower end) of the oil separation filter 23.
The lower end of the pipe 25 is installed so as to be completely immersed below the liquid level of the oil sump 24.

Next, the operation of the constructed gas compressor as described above, will be described with reference to FIG.

When the operation of the gas compressor is started, the oil-containing low-pressure refrigerant gas is compressed in the compression chamber 13 of the compression mechanism 2. The compressed high-pressure refrigerant gas is discharged from the compression mechanism 2 to the discharge chamber 19 side, and inside the discharge chamber 19, the oil separation filter 23, and the discharge port 2
0 in order to be supplied to the high-pressure side of the refrigeration cycle.

At this time, the oil component contained in the high-pressure refrigerant gas is converted into oil droplets on the inner wall surface of the oil separation filter 23 by the effect of collision when the high-pressure refrigerant gas passes through the oil separation filter 23. It is separated and captured.

The oil droplets separated and captured as described above enter the oil return passage 22 (pipe 25) from the bottom of the oil separation filter 23 and travel along the oil return passage 22 to the bottom of the discharge chamber 19. It descends to the oil sump 24 by its own weight and is collected.

At this time, the interior of the oil return passage 22 is
Since the chamber 9 is physically completely separated from the chamber 9 and is in an independent state, the discharge jet of the high-pressure refrigerant gas discharged into the discharge chamber 19 does not act on the inside of the oil return passage 22. Further, since the lower end of the oil return passage 22 is opened below the liquid level of the oil reservoir 24, the oil droplets separated and captured by the oil separation filter 23 pass through the discharge chamber 19 where the discharge jet of the high-pressure refrigerant gas acts. This oil return passage 2 without passing through directly
Since the oil droplets are collected at the oil sump 24 side through only the second oil droplets, such oil droplets are not wound up by the discharge jet of the high-pressure refrigerant gas.

Therefore, according to the gas compressor of the present embodiment, the oil droplets are prevented from being wound up by the discharge jet of the high-pressure refrigerant gas, so that the oil taken out together with the high-pressure refrigerant gas to the high-pressure section of the air conditioner system can be removed. The amount is greatly reduced, and the oil holding capacity of the gas compressor increases,
The oil circulation rate of the refrigeration cycle can be reduced,
It is possible to improve the performance of the refrigeration cycle and the durability of the gas compressor.

By the way, the height of the liquid level of the oil sump 24 changes every moment depending on the operation state of the gas compressor. If the lower end of the oil return passage 22 is significantly exposed above the liquid surface of the oil reservoir 24 due to such a change in the liquid level,
A large gap space is formed between the lower end of the oil return passage 22 and the liquid surface of the oil sump 24, where the discharge jet of the high-pressure refrigerant gas acts. When the oil passes through this large gap space, the discharge of the high-pressure refrigerant gas is performed. It is also conceivable that the jet may cause the oil to be hoisted.

Therefore, in order to reliably prevent the seed oil hoisting phenomenon, the lower end of the oil return passage 22 always sinks below the liquid level of the oil sump 24 regardless of the operating state of the gas compressor. Therefore, it is preferable to open the lower end of the oil return passage 22 deeper into the oil reservoir 24 as shown in FIG.

In the above-described embodiment, the example of the oil separator 21 including the cylindrical oil separation filter 23 has been described. However, this type of oil separator 21 is, for example, separated as shown in FIG. It is also possible to adopt a structure in which an oil separation filter 23 made of a wire mesh, a porous sintered metal, or the like is installed on a part of the side wall of the chamber 26. In this structure, the separation chamber 26 is located immediately below the discharge port 20. And is configured to communicate with the discharge port 20.

The oil return passage 22 can also be provided in the discharge chamber 19 in which the oil separator 21 having the above structure shown in FIG. 3 is installed. In this case, the oil return passage 22 is provided as in the above embodiment. In addition to the simple pipe structure, the vertical hole 27 shown in FIG.
Can be adopted.

When the oil return passage 22 having the vertical hole structure is employed, the vertical hole 27 is formed so as to extend from the bottom side of the oil separation filter 23 to the inside of the wall of the discharge chamber 19 and reach below the liquid level of the oil sump 24. . At this time, the upper end of the vertical hole 27 may be opened directly below the oil separation filter 23, but in the example of FIG.
Due to the structure in which the vertical hole 27 passes through the inside of the wall of the discharge chamber 19, the vertical hole 27
Adopts a structure in which the upper end is opened.

The vertical hole 27 shown in FIG. 3 allows the inner wall of the compressor case 1 and a partition plate 28 extending from the bottom of the separation chamber 26 to face each other. It is configured such that a gap of width becomes a vertical hole.

When the oil return passage 22 having the vertical hole structure as described above is employed, the same operation and effect as those of the oil return passage 22 having the pipe structure shown in FIG. 1 can be obtained.

In the gas compressors of the above embodiments, an example in which one oil separator 21 is provided at the discharge port 20 has been described. However, the oil separator 21 and the wire mesh, baffle plate, perforated plate, etc. May be used in combination with another oil separator (not shown) consisting of: a structure having a discharge passage for discharging the high-pressure refrigerant from the compression mechanism section 2 side to the discharge chamber 19 side; By providing an oil separator different from the oil separator 21 of the present embodiment at the opening end of the discharge passage on the discharge chamber side, a structure is employed in which oil is separated from high-pressure refrigerant gas by these two oil separators. Is also good.

[0040]

In the gas compressor according to the present invention, as described above, the upper end is opened at the bottom side of the oil separation filter and the lower end is opened below the liquid level of the oil sump in the discharge chamber. An oil return passage is provided. For this reason, the oil droplets separated and captured by the oil separation filter are physically completely separated from the chamber of the discharge chamber, and are collected in the oil sump only through the independent oil return passage. This prevents oil droplets from being swirled up by the jet, thereby greatly reducing the amount of oil taken out to the high-pressure side of the air conditioning system together with the high-pressure refrigerant gas, and increasing the oil holding capacity of the gas compressor. At the same time, the oil circulation rate of the refrigeration cycle can be reduced, so that the performance of the refrigeration cycle and the durability of the gas compressor can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of the gas compressor shown in FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the main part of the present invention when the gas compressor shown in FIG. 1 is cut along line BB.

FIG. 4 is a sectional view of a conventional gas compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor case 2 Compression mechanism part 3 Front head 4 Suction chamber 5 Suction port 6 Cylinder 7, 8 Side block 9 Rotor 10 Rotor shaft 11 Vane groove 12 Vane 13 Compression chamber 14 Suction passage 15 Suction port 16 Cylinder discharge hole 17 Reed valve 18 Discharge chamber 19 Discharge chamber 20 Discharge port 21 Oil separator 22 Oil return passage 23 Oil separation filter 24 Oil reservoir 25 Pipe 26 Separation chamber 27 Vertical hole 28 Partition plate

Continued on the front page (72) Inventor Hideji Kamiya 4-3-1, Yashiki, Narashino-shi, Chiba F-term (reference) in Seiko Seiki Co., Ltd. 3H003 AA05 AB07 AC03 BD13 BH05 CD05 3H029 AA05 AA06 AA15 AA17 AA21 AB03 BB35 CC43 3H040 AA09 BB04 BB05 BB14 CC15 DD25

Claims (6)

[Claims] 1. A suction chamber into which an oil-containing low-pressure refrigerant gas is introduced from a low-pressure part side of a refrigeration cycle via a suction port, and an oil-containing low-pressure refrigerant gas introduced into the suction chamber is sucked and compressed. A compression mechanism section for high-pressure refrigerant gas, a discharge chamber from which the high-pressure refrigerant gas is discharged from the compression mechanism section, and an oil component separated from the high-pressure refrigerant gas discharged into the discharge chamber while being installed in the discharge chamber. An oil separator provided with an oil separation filter for dropping the separated oil component into an oil sump at the bottom of the discharge chamber, and discharging the oil separated high-pressure refrigerant gas from the discharge chamber. The oil returns to the high-pressure section of the air-conditioning system through the port, and returns into the discharge chamber with the upper end opening at the bottom side of the oil separation filter and the lower end opening below the level of the oil sump. Characterized by having a passage And a gas compressor. 2. The gas compressor according to claim 1, wherein the oil return passage is formed of a pipe extending from a bottom side of the oil separation filter to a level below the oil sump. 3. The oil return passage according to claim 1, wherein the oil return passage comprises a vertical hole extending from a bottom side of the oil separation filter, through the inside of a wall of the discharge chamber, to a level below the oil sump.
A gas compressor according to item 1. 4. The gas compressor according to claim 1, wherein the oil separator comprises an oil separation filter directly attached to a discharge chamber side opening end of the discharge port. 5. A structure in which the oil separator includes a separation chamber located immediately below the discharge port and communicates with the discharge port, and an oil separation filter is installed on a part of a side wall of the separation chamber. The gas compressor according to claim 1, wherein an upper end of the oil return passage is opened at a bottom surface of the separation chamber. 6. A discharge passage for discharging high-pressure refrigerant from the compression mechanism side to the discharge chamber side, wherein an oil separator different from the oil separator is provided at an opening end of the discharge passage on the discharge chamber side. The gas compressor according to claim 1, wherein the gas compressor is attached.