JP2017053285A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor capable of sufficiently reducing discharged amount of oil out of the compressor through a discharging pipe.SOLUTION: A compressor 1 of this invention shows that a compression mechanism 10 lubricated with oil, an oil reservoir 70 positioned at a lower position than that of this compression mechanism 10 to store oil and a passage 60 for feeding oil discharged out of the compression mechanism 10 to the oil reservoir 70 are arranged in a same container 90. There are provided a discharging pipe 30 arranged to communicate with inside of the container 90 to discharge refrigerant gas compressed by the compression mechanism 10 out of the container 90; and a chamber 50 arranged between the compression mechanism 10 and the oil reservoir 70 within the container 90 and having a space 52 released only below a substantial vertical orientation. An opening part 30a of the discharging pipe 30 at the side of the container 90 is arranged to be positioned in the space 52.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a compressor.

  In general, a compressor used in a refrigeration cycle lubricates its compression mechanism with oil to prevent wear and seizure. In such a compressor, oil is mixed in the compressed refrigerant gas, which may cause a failure of downstream equipment due to oil discharge to the outside of the compressor or a compressor failure due to lack of oil. In order to avoid a decrease in heat exchange efficiency in the condenser or the like due to the intervention of the discharged oil, it is necessary to prevent oil from being discharged from the discharge pipe for discharging the refrigerant gas as much as possible.

  Here, in order to prevent the oil from being discharged from the discharge pipe described above, a technique for separating the refrigerant gas from the oil is disclosed (for example, see Patent Document 1). According to such a technique, using an oil separator or the like, the refrigerant gas and the oil are separated from the mist-like mixture containing the oil, and the blowing up of the oil from the oil reservoir for storing the separated oil is reduced. By doing so, it is expected that the oil discharge described above is reduced.

Japanese Patent Laid-Open No. 2001-140779

  However, in the conventional compressor described above, although it can be expected to reduce the discharge of mist oil coexisting with the refrigerant gas and the oil blown up from the oil reservoir, it flows down on the inner wall of the compressor and becomes an oil reservoir. The liquid film-like oil to be guided tends to be caught in the flow of the refrigerant gas discharged from the discharge pipe and discharged out of the compressor together with the refrigerant gas. For this reason, in the conventional technology, it cannot be said that oil discharge to the outside of the compressor via the discharge pipe can be sufficiently reduced.

  This invention is made | formed based on the above situations, The objective is to provide the compressor which can fully discharge | emit the discharge | emission of the oil to the exterior of a compressor via a discharge pipe.

The present invention
(1) A compression mechanism that is lubricated with oil, an oil reservoir that is located below the compression mechanism and stores the oil, and a passage that guides the oil discharged from the compression mechanism to the oil reservoir are disposed in the same container. Which is a compressor,
A discharge pipe provided so as to communicate with the inside of the container and discharging the refrigerant gas compressed by the compression mechanism to the outside of the container;
A chamber provided between the compression mechanism and the oil reservoir in the container, and having a space opened only substantially vertically downward;
A compressor characterized in that an opening on the container side of the discharge pipe is disposed in the space;
(2) The chamber has a side wall that surrounds the space from the horizontal direction.
The compressor according to (1), wherein a discharge pipe is attached so as to penetrate the side wall,
(3) a frame for fixing the compression mechanism to the inner wall of the container;
The passage is provided between the inner wall of the container and at least a part of the outer periphery of the frame, and has a gap passage through which oil flows down on the inner wall surface of the container. And (4) the compressor according to any one of (1) to (3), wherein the compression mechanism is a scroll type compression mechanism.

  Note that the “chamber having a space opened only substantially vertically downward” refers to an inner wall surface that has a space opened only substantially vertically downward when the compressor is used and that defines the space. Means a chamber where the container and the inner wall of the container are not continuous. “Oil” means lubricating oil for lubricating the compression mechanism.

  The present invention can provide a compressor capable of sufficiently reducing oil discharge to the outside of the compressor via the discharge pipe.

It is a schematic longitudinal cross-sectional view which shows one Embodiment of the compressor of this invention. It is the schematic cross-sectional view which cut | disconnected the compressor of FIG. 1 by the AA line.

The compressor according to the present invention includes a compression mechanism portion that is lubricated with oil, an oil reservoir that is located below the compression mechanism portion and stores the oil, and a passage that guides the oil discharged from the compression mechanism portion to the oil reservoir. Is a compressor stored in the same container,
A discharge pipe that is provided so as to communicate with the inside of the container and discharges the refrigerant gas compressed by the compression mechanism section to the outside of the container;
A chamber provided between the compression mechanism in the container and the oil reservoir, and having a space opened only substantially vertically downward;
The opening on the container side of the discharge pipe is arranged so as to be positioned in the space.

  The compressor is preferably a scroll-type compression mechanism from the viewpoint of effectively protecting the scroll compressor that is particularly susceptible to wear and seizure due to friction and securing the orbiting scroll.

  Hereinafter, an embodiment of a compressor of the present invention will be described with reference to the drawings, taking a compressor (scroll compressor) having a scroll-type compression mechanism as an example. It is not limited only to the embodiment.

  FIG. 1 is a schematic longitudinal sectional view showing an embodiment of the compressor of the present invention. As shown in FIG. 1, the compressor 1 schematically includes a compression mechanism 10, an electric motor 20, a discharge pipe 30, a frame 40, a chamber 50, a passage 60, an oil sump 70, and oil separation. And a container 80. Of these, the compression mechanism 10, the electric motor 20, and the oil reservoir 70 are disposed in the same container 90 in this order from the top to the bottom. With such an arrangement, the inside of the container 90 of the compressor 1 is roughly the upper space S1 above the compression mechanism 10, the middle space S2 between the compression mechanism 10 and the electric motor 20, and the electric motor 20 and the oil reservoir 70. It is divided | segmented into lower space S3 between these.

  The compression mechanism 10 is driven by rotation of a drive shaft 21 using an electric motor 20 described later, and compresses the refrigerant gas. The compression mechanism 10 includes a fixed scroll 110 in which a spiral fixed wrap 112 is erected on a fixed base plate 111 and a revolving scroll 120 in which a spiral revolving wrap 122 is erected on a revolving base plate 121. The fixed wrap 112 and the turning wrap 122 are arranged so as to mesh with each other. Note that the compression mechanism 10 is lubricated with oil in order to prevent wear and seizure associated with driving.

  The fixed scroll 110 is provided with a suction port 113 for sucking refrigerant gas and a discharge port 114 for discharging refrigerant gas compressed by the compression mechanism 10. The orbiting scroll 120 is provided with a boss 123 on the opposite side (rear side) of the orbiting base plate 121 from the orbiting wrap 122. The boss 123 is provided with a orbiting bearing 21 a for receiving a crank pin 22 described later. ing. An Oldham joint 140 is disposed on the back side of the orbiting scroll 120. The Oldham coupling 140 causes the orbiting scroll 120 to orbit without rotating about the fixed scroll 110.

  The electric motor 20 drives the orbiting scroll 120 in the compression mechanism 10. In general, the electric motor 20 is connected to the compression mechanism 10 and transmits a power to the compression mechanism 10, and a rotor fastened to the drive shaft 21. 25 and the stator 26 fixed to the container 90.

  Specifically, the above-described drive shaft 21 is provided with a crank pin 22 at the tip thereof. The crank pin 22 is pivotally supported on the orbiting bearing 21a of the boss 123 in the orbiting scroll 120 so that the orbiting scroll 120 can slide. The drive shaft 21 is provided with an oil supply passage 23 for guiding oil to the main bearing 21b, the lower bearing 21c, and the swivel bearing 21a, and an oil reservoir 70 at the shaft end opposite to the crank pin 22. An oil supply tube 24 for sucking up the oil in the oil supply passage 23 is attached.

  The discharge pipe 30 is provided so as to communicate with the inside of the container 90, and discharges the refrigerant gas compressed by the compression mechanism 10 to the outside of the container 90. The opening 30 a on the container 90 side of the discharge pipe 30 is disposed so as to be positioned in a space 52 described later. Further, the discharge pipe 30 is welded and fixed to the trunk portion 90b of the container 90 so that the inside of the container 90 is airtight. Note that the refrigerant gas discharged from the discharge pipe 30 flows into a condenser (not shown) located downstream of the compressor 1 through the pipe.

  The frame 40 fixes the compression mechanism 10 to the inner wall 90 a of the container 90. Specifically, the frame 40 is fixed with the fixed scroll 110 using the bolt 41 in the compression mechanism 10 described above, and is connected to the inner wall 90a of the container 90 at several circumferential positions (welded portions 40a) on the outer periphery thereof. It is fixed by welding. A revolving scroll 120 and an Oldham coupling 140 are housed in the upper part of the frame 40 and a negative pressure chamber 42 for sucking up oil by the oil supply tube 24 described above is provided. A main bearing 21b and a lower bearing 21c that support the drive shaft 21 are provided.

  A chamber 50 is integrally provided in the frame 40. The chamber 50 is provided between the compression mechanism 10 and the oil reservoir 70 in the container 90, and has a space 52 that is opened only substantially vertically downward. Specifically, the chamber 50 has a side wall 51 that surrounds the space 52 from the horizontal direction, and the discharge pipe 30 is attached so as to penetrate the side wall 51. Thereby, the discharge pipe 30 can be attached with a simple configuration without complicating and / or increasing the size of the container 90. In addition, a metal O-ring (not shown) that closes the outer periphery of the discharge pipe 30 and the side wall 51 is embedded in the side wall 51 so that oil does not enter.

  The passage 60 guides the oil discharged from the compression mechanism 10 to the oil reservoir 70. In the present embodiment, as shown in FIGS. 1 and 2, the passage 60 is provided with one notch 40 b in the vertical direction of the outer periphery of the frame 40 and the fixed scroll 110, and the notch 40 b and the container 90 are connected to each other. 1 is provided between the notch passage 61 (see FIG. 1) formed by the inner wall 90a and the inner wall 90a of the container 90 and at least a part of the outer periphery of the frame 40, and oil flows down on the surface of the inner wall 90a of the container 90. A gap passage 62 (see FIG. 2) and a stator outer peripheral passage 63 (see FIG. 1) to be described later are provided. Since the compressor 1 has the clearance passage 62 as described above, the oil can be more reliably guided to the oil reservoir 70, and the oil to be guided to the oil reservoir 70 is caught in the flow of the refrigerant gas. As a result, the discharge pipe 30 can be further prevented from being discharged.

  The oil reservoir 70 is located below the compression mechanism 10 and stores oil. In the present embodiment, the oil sump 70 is located at the lowermost part in the container 90 so that the oil flowing down in the container 90 can be reliably received. The oil stored in the oil reservoir 70 is sucked into the oil supply passage 23 using the oil supply tube 24 described above.

  The oil separator 80 is a means for separating the refrigerant gas and the oil from the mist-like mixture of the refrigerant gas and the oil (hereinafter also simply referred to as “mist mixture”). In the present embodiment, an oil separator 80 similar to the oil separator exemplified as the gas guide passage frame described in paragraph No. [0021] of JP-A-2001-140779 is employed. The oil separator 80 includes the gas guide passage frame (not shown) described in the above publication, and removes oil from the mist mixture by colliding the flowed mist mixture against a collision plate (not shown). . Since the compressor 1 includes the oil separator 80, the refrigerant gas and the oil are substantially separated from the mist mixture.

  Next, the operation of the compressor 1 configured as described above will be described. First, the compression of the refrigerant gas in the compression mechanism 10 is performed as follows. That is, when the orbiting scroll 120 is rotated by the rotation of the drive shaft 21 using the electric motor 20, the refrigerant gas is sucked from the suction port 113 and introduced into the compression chamber 130 formed by the orbiting scroll 120 and the fixed scroll 110. Is done. The compression chamber 130 into which the refrigerant gas has been introduced is reduced in volume while moving in the center direction of the fixed scroll 110 (in the direction of the discharge port 114 located at the center of the fixed base plate 111), whereby the refrigerant gas gradually increases. Compressed. Next, the compressed refrigerant gas is discharged from the discharge port 114 provided in the fixed scroll 110 to the upper space S <b> 1 in the container 90. The discharged refrigerant gas is discharged into the upper space S1 as a mist mixture.

  Next, the mist-like mixture discharged to the upper space S1 is separated into refrigerant gas and oil by collision with the inner wall 90a of the container 90 facing the upper space S1. Next, most of the separated oil is remixed together with the discharged refrigerant gas while passing through the notch passage 61 and flows into the oil separator 80 as a mist-like mixture. On the other hand, the remaining oil that does not pass through the notch passage 61 flows down while passing through a gap passage 62 formed between the frame 40 and the inner wall 90 a of the container 90.

  Here, the mist mixture flowing into the oil separator 80 is roughly separated into refrigerant gas and oil by collision with the collision plate. Part of the separated refrigerant gas, the oil separated by the oil separator 80, and the oil that has passed through the gap passage 62 flow downward (in the motor 20 side) in the container 90, and the outer periphery of the stator 26 And the stator outer peripheral passage 63 formed between the inner wall 90a of the container 90 and reach the lower space S3. The oil that has reached the lower space S3 flows down into the oil reservoir 70. On the other hand, a part of the separated refrigerant gas cools the electric motor 20 when passing through the stator outer peripheral passage 63, and is then led again from the lower space S3 to the middle space S2 through the other stator outer peripheral passage 63. The other part of the refrigerant gas separated by the oil separator 80 merges with the middle space S2. Next, the merged refrigerant gas goes to the opening 30 a of the discharge pipe 30 and is then discharged from the discharge pipe 30.

  By the way, the refrigerant gas that has passed through the oil separator 80 coexists with a small amount of oil that could not be separated. The coexisting refrigerant gas and part of the oil are separated into oil and refrigerant gas by centrifugal action (inertia) when heading toward the opening 30 a of the discharge pipe 30, and this separated oil is separated into the inner wall 90 a of the container 90. Adhere to. The adhered oil forms a liquid film on the inner wall 90a of the container 90 together with the oil that has passed through the gap passage 62 described above, and the formed liquid film flows down on the inner wall 90a of the container 90 by its own weight, so that the stator outer peripheral passage After passing through 63, the oil is introduced into the oil sump 70.

  Here, the compressor 1 includes the chamber 50 having the space 52 opened only substantially vertically below, and the opening 30 a on the container 90 side of the discharge pipe 30 is disposed in the space 52. Yes. Therefore, the liquid film-like oil that is to flow down on the inner wall 90a of the container 90 of the compressor 1 and is guided to the oil reservoir 70 is discharged around the opening 30a of the discharge pipe 30 (the discharge facing the space 52 in the chamber 50). The liquid film-like oil is caught in the flow of the refrigerant gas discharged from the discharge pipe 30 and discharged from the discharge pipe 30 together with the refrigerant gas. As a result, oil discharge to the outside of the compressor through the discharge pipe can be sufficiently reduced.

  From the above, the compressor 1 is a highly reliable refrigeration cycle (for example, capable of preventing failure of the compressor or the like due to oil discharge to the outside of the compressor or reduction in heat exchange efficiency in the condenser or the like). , Refrigerators, air conditioners, etc.).

  In addition, this invention is not limited to the structure of embodiment mentioned above, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included. Is done.

  For example, in the above-described embodiment, the scroll compressor is exemplified and described as the compressor 1. However, the compressor is not particularly limited as long as the effects of the present invention are not impaired. For example, a rotary compressor, a screw compressor, a reciprocating compressor, The present invention can also be applied to other compressors such as a turbo compressor.

  In the above-described embodiment, the compressor 1 in which the chamber 50 is provided integrally with the frame 40 has been described. However, the compressor 1 is not particularly limited as long as the effects of the present invention are not impaired, and the chamber is separate from the frame. It may be a compressor provided.

  In the above-described embodiment, the compressor 1 in which the discharge pipe 30 is attached so as to penetrate the side wall 51 has been described. However, the compressor in which the discharge pipe is attached so as to penetrate the upper wall of the chamber. In addition, a compressor in which the opening of the discharge pipe is inserted into the space from below the space without penetrating the wall of the chamber is also within the intended scope of the present invention.

  In the above-described embodiment, the notch passage 61 and the stator outer peripheral passage 63 have been described as having a specific shape and a specific number of compressors 1 as the passage 60. However, the present invention is not limited to this. Can be determined.

DESCRIPTION OF SYMBOLS 1 Compressor 10 Compression mechanism 30 Discharge pipe 30a Opening 40 Frame 50 Chamber 51 Side wall 52 Space 60 Passage 62 Clearance passage 70 Oil reservoir 90 Container 90a Inner wall

Claims (4)

A compression mechanism that lubricates with oil, an oil reservoir that is located below the compression mechanism and stores the oil, and a passage that guides the oil discharged from the compression mechanism to the oil reservoir are disposed in the same container. A compressor,
A discharge pipe provided so as to communicate with the inside of the container and discharging the refrigerant gas compressed by the compression mechanism to the outside of the container;
A chamber provided between the compression mechanism and the oil reservoir in the container, and having a space opened only substantially vertically downward;
A compressor characterized in that an opening on the container side of the discharge pipe is disposed in the space. The chamber has side walls surrounding the space from the horizontal direction,
The compressor according to claim 1, wherein a discharge pipe is attached so as to penetrate the side wall. A frame for fixing the compression mechanism to the inner wall of the container;
The passage is provided between the inner wall of the container and at least a part of the outer periphery of the frame, and has a gap passage through which oil flows down on the inner wall surface of the container. Compressor.   The compressor according to any one of claims 1 to 3, wherein the compression mechanism is a scroll type compression mechanism.

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