JP3633638B2 - Electric compressor - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an electric compressor used in a cooling device such as an air conditioner or a refrigerator.
[0002]
[Prior art]
Conventionally, an electric compressor such as a rotary compressor or a scroll compressor has been used for a cooling device such as an air conditioner or a refrigerator.
[0003]
As a conventional technique of this type of compressor, a scroll compressor disclosed in Japanese Patent Application Laid-Open No. 61-212689 will be described as an example with reference to the drawings.
[0004]
As shown in FIG. 6, in the sealed container 101, there are a compression mechanism portion 102, a stator 104 and a rotor 105 constituting the electric motor 103, and a crankshaft 106 that transmits the rotation of the electric motor 103 to the compression mechanism portion 102. It is arranged. Further, the sealed container 101 is provided with a suction pipe 107 that sucks in the low-pressure refrigerant gas and a discharge pipe 108 that discharges the high-pressure refrigerant gas compressed by the compression mechanism.
[0005]
In the above configuration, when the rotor 105 constituting the electric motor 103 rotates, this rotational force is transmitted to the compression mechanism 102 by the crankshaft 106. When a rotational force is transmitted to the compression mechanism 102, a compression action occurs. As a result, the low-pressure refrigerant gas sucked from the suction pipe 107 is compressed into the high-pressure refrigerant gas by the compression mechanism 102 and discharged into the sealed container 101. The high-pressure refrigerant gas passes through the gap of the electric motor 103 and is discharged from the discharge pipe 108 to the refrigeration cycle (not shown).
[0006]
[Problems to be solved by the invention]
Conventionally, in a compressor having the above-described configuration, refrigerating machine oil is mixed in refrigerant gas in order to seal a minute gap in the compression mechanism 102 and increase compression efficiency during normal operation. Further, the refrigerating machine oil agitated by the rotor 105 of the electric motor 103 is scattered in the airtight container 101 as a large amount of liquid droplets.
[0007]
Therefore, the high-pressure refrigerant gas discharged from the compression mechanism 102 into the sealed container 101 comes into contact with and captures a larger amount of droplet-shaped refrigeration oil inside the sealed container 101. As a result, a large amount of refrigeration oil is discharged from the discharge pipe 108 to the refrigeration cycle together with the high-pressure refrigerant gas. In particular, when the compressor is rotated at a high speed to increase the refrigerant discharge amount, the ratio of the weight of the refrigerating machine oil to the weight of the discharged refrigerant significantly increases.
[0008]
As the amount of oil discharged from the compressor to the refrigeration cycle increases, pipe pressure loss in the refrigeration cycle increases. In addition, since the heat exchange efficiency in heat exchangers such as condensers and evaporators is reduced, the refrigeration capacity does not increase even if the compressor is rotated at a high speed, or the coefficient of performance of the refrigeration cycle is reduced. Had.
[0009]
The present invention solves the above-described problems of the conventional example, and provides a compressor having a high coefficient of performance without increasing the amount of oil discharged from the compressor to the refrigeration cycle even when the compressor is operated at high speed. It is intended.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the present invention arranges a box that gradually widens downward so as to cover the inside of the sealed container of the discharge pipe provided in the sealed container, and the box is made of metal, etc. Or a thin plate provided with a large number of holes.
[0015]
[Action]
The effect | action by the said means is as follows.
[0019]
According to the present invention , since the passage of the refrigerant gas can be controlled by covering the net or the thin plate with the box, the contact time of the high-pressure refrigerant gas containing the refrigerating machine oil with the net or the thin plate is further increased. It becomes possible. As a result, only the refrigerating machine oil adheres to the net or the thin plate, and the high-pressure refrigerant gas passes through a large number of holes provided in the mesh gap or the thin plate, so that the effect of separating the refrigerating machine oil from the high-pressure refrigerant gas becomes greater. In addition, there is an effect of preventing scattering in a metal-made net or a thin sealed container provided with a large number of holes. Further, since the box is wider in the downward direction, the size of the refrigerating machine oil that gradually grows in size toward the lower side of the box due to the flow of the high-pressure refrigerant gas from the lower side to the upper side in the box. Refrigerating machine oil can be more reliably dropped on the bottom surface of the sealed container without being hindered by dropping of drops.
[0021]
【Example】
Hereinafter, a hermetic compressor according to an embodiment of the present invention will be described with reference to the drawings, taking a scroll compressor as an example.
[0022]
In FIG. 1, inside the sealed container 1, a compression mechanism portion 4, an electric motor 10 composed of a stator 11 and a rotor 12 that drive the compression mechanism portion 4, and the rotational force of the electric motor 10 are compressed. A crankshaft 9 supported by a bearing member 8 that transmits to the mechanism portion 4 and a sub-bearing 13 is disposed.
[0023]
After the low-pressure refrigerant gas sucked from the suction pipe 2 is sucked and compressed from the suction port 14 of the compression mechanism unit 4 composed of the orbiting scroll 5, the fixed scroll 6, the rotation restraint component 7, and the bearing member 8, It becomes high-pressure refrigerant gas and is discharged from the discharge port 15 to the discharge space 16 side of the sealed container 1. And it discharges to the motor space 18 with which the electric motor 10 was arrange | positioned through the communicating hole 17 which connects the said discharge space 16 and the motor space 18 provided in the outer periphery of the compression mechanism part 4. FIG. Thereafter, the liquid is discharged from the discharge pipe 3 of the sealed container 1 to the outside of the sealed container 1. The hermetic container 1 is connected to a refrigeration cycle (not shown) by a suction pipe 2 and a discharge pipe 3, and after exchanging heat in the refrigeration cycle, it is sucked again as a low-pressure refrigerant gas from the suction pipe 2. The
[0024]
Now, the refrigerating machine oil 19 is stored inside the sealed container 1. The refrigerating machine oil 19 is pumped up by a lubrication pump 20 installed at one end of the crankshaft 9, passes through a passage provided at the center of the crankshaft 9, lubricates the sliding portion of the compression mechanism portion 4, and then again. It is stored in the sealed container 1. A part of the refrigerating machine oil 19 that lubricates the sliding portion of the compression mechanism portion 4 is mixed with the refrigerant gas being compressed in order to seal the gap of the compression mechanism portion 4 and increase the compression efficiency. For this reason, the high-pressure refrigerant gas discharged from the discharge port 15 contains a large amount of refrigerating machine oil.
[0025]
The high-pressure refrigerant gas containing a large amount of refrigerating machine oil collides at high speed with the net 21 installed so as to cover the discharge port 15. At this time, only the refrigerating machine oil adheres to the net 21 due to the difference in surface tension. The adhering refrigerating machine oil falls along the surface of the net 21 due to gravity and accumulates below the sealed container 1. Further, the high-pressure refrigerant gas passes through the gap of the mesh 21 and is discharged into the discharge space 16, and then passes through the communication hole 17 provided in the outer peripheral portion of the compression mechanism portion 4, so that the motor space 18 of the sealed container 1. Then, it is discharged from the discharge space 3 to the outside of the sealed container 1.
[0026]
Accordingly, the high-pressure refrigerant gas discharged from the sealed container 1 into the refrigeration cycle contains almost no refrigeration oil.
[0027]
In the above embodiment, the net 21 is installed so as to cover the discharge port 15, but a thin plate provided with a large number of holes may be installed instead of the net 21.
[0028]
As a second embodiment, as shown in FIG. 2, a box body 22 is installed so as to cover the discharge port 15, a small hole 23 is provided at one location of the box body 22, and the small hole 23 is formed in the sealed container 1. You may make it oppose the inner wall of.
[0029]
As a result, the high-pressure refrigerant gas discharged from the discharge port 15 is temporarily discharged into the box 22 and discharged to the discharge space 16 through the small hole 23. Since the small hole 23 faces the inner wall of the sealed container 1, the high-pressure refrigerant gas collides with the inner wall at a high speed. The high-pressure refrigerant gas that has collided with the inner wall at high speed flows along the inner wall. As a result, the high-pressure refrigerant gas comes into contact with the inner wall of the sealed container 1 for a relatively long time. During this contact, the refrigerating machine oil contained in the high-pressure refrigerant gas sequentially adheres to the inner wall of the sealed container 1, and the adhering refrigerating machine oil grows into larger droplets on the inner wall due to its surface tension, Finally, it flows down to the bottom of the sealed container 1 due to gravity.
[0030]
As a result, the refrigerating machine oil is almost removed from the high-pressure refrigerant gas.
In the embodiment described above, the small hole 23 provided in the box 22 is provided at one place, but may be provided at two or more places as long as the outlet of the small hole 23 faces the inner wall of the sealed container 1.
[0031]
As a third embodiment, as shown in FIG. 3, a net 24 may be installed so as to cover the inside of the sealed container 1 of the discharge pipe 3.
[0032]
Thereby, when the high-pressure refrigerant gas containing a large amount of refrigerating machine oil discharged from the discharge port 15 of the compression mechanism unit 4 passes through the communication hole 17 from the discharge space 16 and flows into the motor space 18, the sealed container 1. Even when it comes into contact with and captures the refrigerating machine oil 19 scattered as a large amount of liquid droplets in the motor space 18, even when a large quantity of refrigerating machine oil is contained, Since the mesh 24 is installed so as to cover the inside, only the refrigerating machine oil adheres to the mesh 24 here, and the high-pressure refrigerant gas passes through the gaps of the mesh 24, and the operation described in the first embodiment Similarly, refrigeration oil is separated from the refrigerant gas.
[0033]
As a result, the high-pressure refrigerant gas discharged into the refrigeration cycle contains almost no refrigeration oil.
[0034]
As a fourth embodiment, as shown in FIGS. 4 (a) and 4 (b), a box 25 is installed so as to cover the inside of the sealed container 1 of the discharge pipe 3 provided in the sealed container 1. The net 24 may be packed in the box 25.
[0035]
Thereby, in addition to the effect | action demonstrated in the said 3rd Example, since the channel | path of refrigerant | coolant gas can be controlled by covering the net | network 24 with the box 25, the high-pressure refrigerant gas containing refrigerating machine oil, The contact time with the net 24 can be made longer. As a result, the separation effect between the high-pressure refrigerant gas and the refrigerating machine oil is improved.
[0036]
In the third and fourth embodiments, the mesh 24 is installed so as to cover the discharge pipe 3, but a thin plate provided with a large number of holes instead of the mesh 24 may be used.
[0037]
As a fifth embodiment, as shown in FIGS. 5 (a) and 5 (b), the internal space of the sealed container 1 is provided with the discharge port 15 of the compression mechanism portion 4 by the compression mechanism portion 4. A communication hole 17 is provided on the outer periphery of the compression mechanism portion 4 to communicate the discharge space 16 and the motor space 18. The communication hole 17 is partitioned into the motor space 18 side where the motor 10 is disposed. You may install the collision board 27 in the position which the 17 motor space 18 side exit opposes.
[0038]
Thereby, when the high-pressure refrigerant gas containing a large amount of refrigerating machine oil is discharged from the discharge port 15 of the compression mechanism unit 4 to the discharge space 16 and flows into the motor space 18 through the communication hole 17, the motor in the communication hole 17. Since the collision plate 27 is installed at the space 18 side outlet, the high-pressure refrigerant gas that has passed through the communication hole 17 collides with the collision plate 27 at a high speed. As a result, similar to the operation described in the second embodiment, the high-pressure refrigerant gas that has collided with the collision plate 27 at a high speed flows along the collision plate 27. As a result, the high-pressure refrigerant gas has a relatively long time, It comes into contact with the collision plate 27. During this contact, the refrigerating machine oil contained in the high-pressure refrigerant gas sequentially adheres to the collision plate 27, and the adhering refrigerating machine oil grows into larger droplets on the collision plate 27 by its surface tension, and finally Therefore, it flows down to the bottom of the sealed container 1 due to gravity.
[0039]
As a result, the high-pressure refrigerant gas and the refrigerating machine oil can be separated.
[0040]
【The invention's effect】
As is apparent from the above description, the present invention provides a high-pressure refrigerant by a net installed so as to cover the discharge port even when a large amount of refrigerating machine oil is contained in the high-pressure refrigerant gas discharged from the discharge port of the compression mechanism unit. The gas and the refrigerating machine oil are substantially separated, and as a result, the amount of the refrigerating machine oil discharged to the outside of the sealed container is greatly reduced.
[0041]
In addition to the above effects, a compressor having a discharge valve at the discharge port, or a pulsation of high-pressure refrigerant gas discharged from the discharge port, with a box provided with a small hole installed so as to cover the discharge port The impact sound generated when the discharge valve is opened and closed can be reduced, and as a result, the noise generated from the compressor can be reduced.
[0042]
In addition, the refrigerating machine oil stored in the closed container is agitated by the rotor of the electric motor and scattered in the closed container as a large amount of liquid droplets, and the refrigerating machine oil-containing high-pressure refrigerant gas contains a larger amount of refrigerating machine oil. Even when it is in contact with and captured, the net is installed so as to cover the inside of the closed vessel of the discharge pipe, so that the high-pressure refrigerant gas and the refrigerating machine oil are discharged immediately before being discharged from the closed vessel to the refrigeration cycle. The amount of the refrigerating machine oil that is separated and discharged to the outside of the sealed container can be reduced.
[0043]
In addition to the above effect, the box filled with a net installed so as to cover the inside of the closed container of the discharge pipe can control the refrigerant gas passage, so that the high-pressure refrigerant gas containing refrigerating machine oil and The contact time with the net can be made longer, and as a result, the separation action between the high-pressure refrigerant gas and the refrigerating machine oil is further improved. Moreover, when the said net | network is metal, it can prevent that a net | network and an electric motor terminal contact and a short circuit accident generate | occur | produces.
[0044]
Further, in a compressor having a configuration in which the space in the sealed container is partitioned into a discharge space and an electric motor space by the compression mechanism unit, this collision can be achieved by installing a collision plate at a position facing the motor space outlet of the communication hole. The high pressure refrigerant gas and the refrigerating machine oil are separated by the plate, and as a result, the amount of the refrigerating machine oil discharged to the outside of the sealed container can be reduced.
[0045]
In addition, although the said effect is acquired also by each Example independently, the effect which isolate | separates a high pressure refrigerant gas and refrigeration oil can further be improved by combining several Examples.
[0046]
As described above, even when the compressor is operated at a high speed, the amount of oil discharged from the compressor to the refrigeration cycle does not increase, and as a result, a compressor with a high coefficient of performance is obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a scroll compressor according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view of a scroll compressor according to another embodiment of the present invention. FIG. 4A is a partial sectional view of a scroll compressor according to another embodiment of the present invention, and FIG. 4B is a sectional view taken along line AA ′ of the scroll compressor shown in FIG. 5A is a partial cross-sectional view of a scroll compressor according to another embodiment of the present invention, and FIG. 5B is a cross-sectional view of the scroll compressor shown in FIG. 5A. FIG. Cross section of scroll compressor 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 1 Airtight container 4 Compression mechanism part 15 Discharge port 16 Discharge space 17 Communication hole 18 Electric motor space 21 Net | network 22 which covers a discharge port Box body 23 which covers a discharge port Small hole 24 Net | network 25 which covers the inner side of the sealed container of a discharge pipe | tube 25 Body 26 Motor terminal 27 Collision plate

Claims (1)

A sealed container in which a suction pipe is provided at one end in the horizontal direction and a discharge pipe is provided at the opposite end, a compression mechanism section, and an electric motor are arranged in this order from the inside of the sealed container toward the discharge pipe. The compression mechanism is configured such that the suction port is directly connected to the suction pipe, the discharge port is opened toward the suction pipe side end inside the sealed container, and is connected to the electric motor by a crankshaft. The lubricating oil stored at the bottom of the sealed container is pumped up by a lubrication pump to lubricate and seal the sliding part, and the high-pressure refrigerant gas discharged from the discharge port of the compression mechanism part sucks the inside of the sealed container A horizontal type electric motor that flows from the pipe side end to the discharge pipe side end through a communication hole provided on the outer periphery of the compression mechanism, flows while cooling the electric motor, and is finally discharged from the discharge pipe to the cooling cycle. A compressor, wherein the discharge pipe is sealed A box having a width that gradually widens downward from the inner opening of the discharge pipe sealed container and covers the inner opening is disposed in the sealed container, and the box is made of metal. An electric compressor characterized by packing a net such as a thin plate with a large number of holes.

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