JP2017115580A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor in which an amount of discharged oil out of a discharging pipe is restricted and then a high efficient high reliability can be attained.SOLUTION: There are provided a compression mechanism part 50 arranged in a tight-sealed container 1 to which a discharging pipe 2 is connected, and an electric motor 3 for driving the compression mechanism part 50. Refrigerant gas discharged out of a discharging port 12 arranged at the compression mechanism part 50 is passed through a first space 30 positioned between the compression mechanism part 50 and the electric motor 3 and a second space 31 at a rotor passage 3b arranged inside a rotor 3a of the electric motor 3 and at a counter-compression mechanism part 50 of the electric motor 3, is discharged out of the discharging pipe 2. An opening part 3e formed by a balance-weight 3c arranged at a counter-compression mechanism part 50 of the rotor 3a, an end plate 3d and the rotor 3a is arranged at a position where an area of the stator 3g of the electric motor 3 opposing against a coil end 3j at the counter-compression mechanism part 50 becomes maximum.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a compressor used in a cooling device such as a cooling / heating air conditioner or a refrigerator, or a heat pump type hot water supply device.

  Conventionally, a hermetic compressor used in an air conditioner, a cooling device, or the like generally plays a role of compressing a refrigerant gas returned from a refrigeration cycle by a compression mechanism and feeding it into the refrigeration cycle. The refrigerant gas returned from the refrigeration cycle is supplied to a compression chamber formed in the compression mechanism section through an intake path.

  Thereafter, together with the oil supplied for sealing and lubrication, the refrigerant gas compressed into a high-temperature and high-pressure state is discharged from the compression mechanism into the sealed container, and from the discharge pipe provided in the sealed container, the refrigeration cycle (For example, refer to Patent Document 1).

  FIG. 8 is a cross-sectional view of a compressor of a conventional scroll compressor described in Patent Document 1.

  In this scroll compressor, a compression mechanism unit 50 is provided in the upper part of the hermetic container 1, which is formed by meshing a fixed scroll 6 and a movable scroll 9 revolving with respect to the fixed scroll 6. In addition, an electric motor 3 including a rotor 3 a attached to the crankshaft 4 and a stator 3 g attached to the sealed container 1 is provided at a lower portion in the sealed container 1.

  Furthermore, a sub-bearing 25 of the crankshaft 4 and a sub-bearing support part 40 that supports the sub-bearing 25 and is fixed to the sealed container are provided below the rotor 3a, and oil is supplied to the bottom of the sealed container 1. An oil reservoir 33 for storage is provided.

  The auxiliary bearing support component 40 is provided in a disc shape so as to cover the oil reservoir 33, and the communication port 41 that connects the oil reservoir 33 side and the anti-oil reservoir side of the auxiliary bearing support component 40 to the anti-oil reservoir side The opening is provided in the circumferential direction on the oil reservoir side.

  As a result, the oil in the oil reservoir 33 can be reduced from being taken out to the space above the auxiliary bearing support component 40, the amount of oil discharged can be reduced, the cycle efficiency can be improved, and the oil level of the oil reservoir 33 can be prevented from running out. Therefore, the reliability of the compressor can be improved.

JP 2010-121583 A

  However, in the conventional configuration, for example, when the refrigerant is excessively mixed with the oil in the oil reservoir and the oil level rises, the oil in the oil reservoir is lifted by the refrigerant gas through the opening of the auxiliary bearing support component. There has been a problem that the oil tends to flow out of the compressor, leading to an increase in oil discharge amount. Therefore, problems such as a decrease in cycle efficiency and pipe blockage are likely to occur due to a large amount of oil flowing out during the cycle.

In addition, since the amount of oil supplied to the compression mechanism for sealing and lubrication increases under high differential pressure operating conditions, the amount of oil in the refrigerant gas that is discharged also increases, until it flows out of the compressor. If they are not separated in the meantime, a large amount of oil will flow out during the cycle, and problems such as a decrease in cycle efficiency and pipe clogging are likely to occur.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a highly efficient and highly reliable compressor that suppresses the oil discharge amount from the discharge pipe.

  In order to solve the above-described conventional problems, a compressor according to the present invention includes a sealed container having an oil reservoir at a lower portion to which a discharge pipe is connected, a compression mechanism unit disposed in the sealed container, A refrigerant discharged from a discharge port provided in the compression mechanism portion, and an electric motor for driving the compression mechanism portion disposed on the side opposite to the discharge pipe of the compression mechanism portion in a sealed container The gas flows through a first space located between the compression mechanism and the electric motor, and is formed on the rotor passage provided in the rotor of the electric motor and on the side opposite to the compression mechanism of the electric motor. In the compressor discharged from the discharge pipe via the second space, a balance weight and an end plate are provided on the side opposite to the compression mechanism portion of the rotor, and the rotor and the The opening formed by the balance weight and the end plate is The coil end opposite to the area of anti the compression mechanism portion side of the stator motivation is characterized in that it is arranged in a position of maximum.

  As a result, the oil in the refrigerant gas can be efficiently collided and separated with the coil end of the stator, so that the amount of oil discharged from the discharge pipe can be suppressed and a highly efficient and highly reliable compressor can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the oil discharge amount from a discharge pipe can be suppressed and a highly efficient and highly reliable compressor can be provided.

The longitudinal cross-sectional view of the compressor by Embodiment 1 of this invention XX sectional view of FIG. The figure which expand | deployed the lower coil end of the stator of the compressor by Embodiment 1 of this invention to the circumferential direction The figure which shows the relationship between the rotor opening part height, the area facing a lower coil end, and oil discharge amount Vertical sectional view of a vertical scroll compressor according to Embodiment 2 of the present invention Vertical sectional view of a vertical scroll compressor according to Embodiment 3 of the present invention XX sectional view of FIG. Sectional view of a conventional scroll compressor

  According to a first aspect of the present invention, there is provided an airtight container having an oil reservoir at a lower portion and connected to a discharge pipe, a compression mechanism portion disposed in the airtight container, and a reaction of the compression mechanism portion in the airtight container. An electric motor for driving the compression mechanism portion disposed on the discharge pipe side, and refrigerant gas discharged from a discharge port provided in the compression mechanism portion includes the compression mechanism portion and the electric motor. Through the first space located between the rotor passage provided in the rotor of the electric motor and the second space formed on the side opposite to the compression mechanism portion of the electric motor, In the compressor discharged from the discharge pipe, a balance weight and an end plate are provided on the side opposite to the compression mechanism portion of the rotor, and the rotor, the balance weight, and the end plate are formed. The opening is on the side opposite to the compression mechanism of the stator of the electric motor. Area facing the Iruendo are compressors disposed in a position of maximum.

  According to this configuration, the refrigerant gas discharged from the opening of the rotor on the side opposite to the compression mechanism is caused to collide with the coil end of the stator of the electric motor in the maximum area, and the oil in the refrigerant is allowed to collide with the coil end of the stator. Therefore, the oil discharge amount from the discharge pipe can be suppressed, and high efficiency and high reliability can be realized.

  According to a second aspect, in the compressor according to the first aspect, a spacer is disposed between the end of the rotor and the balance weight.

  According to this configuration, in order to arrange the opening surrounded by the rotor, the balance weight, and the end plate at a height where the area facing the coil end on the side of the anti-compression mechanism of the stator of the motor is maximized. The thickness of the spacer can be easily adjusted.

  According to a third aspect of the present invention, in the compressor according to the first or second aspect, the end plate is disposed closer to the rotor than the end of the balance weight.

  According to this configuration, it is possible to easily reduce the area of the opening without increasing the balance of the compressor due to the balance weight, and to increase the collision speed of the stator with the coil end. Can be separated to the maximum at the coil end of the stator, the amount of oil discharged from the discharge pipe can be suppressed, and high efficiency and high reliability can be realized.

  According to a fourth aspect of the present invention, in the compressor according to any one of the first to third aspects, the end plate is disposed so as to surround the balance weight.

  According to this configuration, the area of the opening can be easily reduced by the end plate without changing the shape or the like of the balance weight, and the collision speed of the stator to the coil end can be increased. By separating the oil in the refrigerant to the coil end of the stator as much as possible, the amount of oil discharged from the discharge pipe can be suppressed, and high efficiency and high reliability can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a vertical scroll compressor according to Embodiment 1 of the present invention.

  FIG. 2 is a cross-sectional view of the electric motor viewed from the XX direction of FIG. The operation and action of the scroll compressor configured as shown in the figure will be described below.

  In FIG. 1, the entire inside of the iron hermetic container 1 becomes a discharge pressure atmosphere communicating with the discharge pipe 2. The electric motor 3 is arranged at the center and the compression mechanism is arranged at the upper part, and is fixed to the rotor 3 a of the electric motor 3. A main body frame 5 of a compression mechanism 50 that supports one end of the crankshaft 4 is fixed to the sealed container 1, and a fixed scroll 6 is attached to the main body frame 5.

  The oil passage 7 in the main shaft direction provided in the crankshaft 4 has one end communicating with the oil supply pump device 8 and the other end finally communicating with the eccentric bearing 10 of the orbiting scroll 9.

The orbiting scroll 9 that meshes with the fixed scroll 6 to form the compression chamber 11 includes a spiral orbiting scroll wrap 9a and a wrap support disc 9b in which an eccentric bearing 10 is erected. The fixed scroll 6 and the main body frame 5 It is arranged between.

  The fixed scroll 6 includes an end plate 6a and a spiral fixed scroll wrap 6b. A discharge port 12 is disposed at the center of the fixed scroll wrap 6b, and a suction port 14 connected to the suction pipe 13 is disposed at the outer peripheral portion.

  An eccentric shaft 16 that is eccentric from the main shaft 15 of the crankshaft 4 and is disposed at the upper end of the crankshaft 4 is configured to engage and slide with the eccentric bearing 10 of the orbiting scroll 9.

  The main shaft 15 is slidably engaged with the main bearing 17 of the main body frame 5, and an annular seal member 18 concentric with the main bearing 17 is mounted on the main body frame 5 in a loose state. A back chamber 19 having a substantially discharge pressure atmosphere on the inside thereof is partitioned from a back pressure chamber 20 having an intermediate pressure atmosphere on the outside.

  The oil sucked up by the oil supply pump device 8 passes through the oil passage 7 of the crankshaft 4 and is guided to an internal space 21 formed between the orbiting scroll 9 and the eccentric shaft 16, one of which is a lap support circle of the orbiting scroll 9. The back pressure chamber 20 surrounded by the fixed scroll 6 and the main body frame 5 is connected to the back pressure chamber 20 through the throttle portion 22 provided on the back surface of the plate 9b, and the back pressure adjusting valve 23 and the oil supply passage 23a are connected. It is led to the compression chamber 11 through.

  The back pressure adjusting valve 23 has a function of pressing the orbiting scroll 9 against the fixed scroll 6 while maintaining an intermediate pressure higher than the suction pressure. The back pressure adjusting valve 23 includes the orbiting scroll wrap support disk 9b, the upper surface of the fixed scroll wrap 6b, and the end plate 6a. A thrust bearing is formed. The other passes through the eccentric bearing 10, the back chamber 19, and the main bearing 17 and is discharged to the outside of the compression mechanism.

  A check valve device 24 that opens and closes the outlet side of the discharge port 12 is mounted on an anti-wrap side plane of the end plate 6a of the fixed scroll 6, and the check valve device 24 includes a reed valve 24a made of a thin steel plate. It consists of a valve presser 24b.

  The lower end of the crankshaft 4 is supported by a secondary bearing 25 fixed by welding or shrink fitting in the sealed container 1 and can rotate stably. The auxiliary bearing 25 has a journal bearing configuration, and a part of the oil sucked up by the oil supply pump device 8 is supplied to the auxiliary bearing 25.

  A discharge chamber 26 on the downstream side of the check valve device 24 is formed between the fixed scroll 6 and the separating member 27, and is separated from the discharge space 28 above the compression mechanism portion communicating with the discharge pipe 2 by the separating member 27. .

  The gas compressed by the compression mechanism section passes through the downward gas flow path 29 provided in the vicinity of the outer periphery of the compression mechanism section from the discharge chamber 26, and the first space 30 above the rotor 3a as shown by the dotted arrow in the figure. Led to.

  Here, the main bearing 17 and the like merge with the oil discharged after lubrication, and the mixed flow of gas and oil is centrifuged through the rotor passage 3b provided in the rotor 3a as shown in FIG. The force is discharged to the outside from the opening 3e surrounded by the rotor 3a, the lower balance weight 3c, and the end plate 3d, collides with the lower coil end 3j of the stator 3g, and is separated into gas and liquid.

The gas after the gas-liquid separation reaches the second space 31 below the rotor 3a, passes through the stator passage 3h provided on the outer periphery of the stator 3g, and is partitioned from the first space 30 by the partition member 32. After being guided to the space above the stator 3g and reaching the discharge space 28 through an upward gas passage (not shown) provided in the compression mechanism 50, the discharge is discharged from the discharge pipe 2 to the outside of the sealed container 1. Is done.

  In the present embodiment, as shown in FIG. 1, a spacer 3f is provided between the rotor end and the lower balance weight.

  With this configuration, the height position of the opening 3e of the rotor 3a is adjusted by the thickness of the spacer 3f so that the area facing the lower coil end 3j of the stator 3g of the electric motor 3 is maximized. This operation and action will be described in detail.

  FIG. 3 is a diagram in which the lower coil end 3j of the stator 3g is developed in the circumferential direction (360 °). The hatched portion in the figure indicates the area A where the opening 3e of the rotor 3a faces the lower coil end 3j.

  That is, A is an area where the refrigerant containing the oil discharged from the opening 3e collides with the lower coil end 3j of the stator 3g due to the rotation of the rotor 3a. As shown in the figure, if the height position of the opening is different, the area A is different.

  FIG. 4 shows the relationship between the height of the opening 3e of the rotor 3a, the area (total) A facing the lower coil end 3j, and the oil discharge amount.

  Also from this figure, if the height of the opening is different, the area A facing the lower coil end 3j is different, and the height of the opening 3e where the area A is maximum exists. And it turns out that the oil discharge amount in the height position becomes the minimum.

  That is, by providing the spacer 3f with the refrigerant containing the oil discharged from the opening 3e of the rotor 3a and causing the lower coil end 3j to collide with the maximum area, the oil from the discharge pipe 2 is obtained. The discharge amount can be suppressed, and high efficiency and high reliability can be realized.

(Embodiment 2)
FIG. 5 is a longitudinal sectional view of the vertical scroll compressor according to Embodiment 2 of the present invention.

  The basic configuration of the present embodiment is the same as that shown in FIG. Also, the same components as those described in FIG.

  In this embodiment, as shown in FIG. 5, an end plate 3d is provided between the lower balance weights 3c provided on the side of the rotor 3a opposite to the compression mechanism.

  With the above configuration, as shown in the first embodiment, the height of the opening 3e of the rotor 3a is adjusted by the thickness of the spacer, and the oil-containing refrigerant is transferred to the lower coil end 3j with the maximum area. In addition to maximum collision separation, the area of the opening 3e of the rotor 3a is easily reduced without breaking the balance of the compressor by the lower balance weight 3c, and the stator 3g collides with the lower coil end 3j. The speed can be increased.

  As a result, the oil in the refrigerant is further separated into the lower coil end 3j of the stator 3g to the maximum, so that the amount of oil discharged from the discharge pipe 2 can be suppressed, and high efficiency and high reliability can be achieved. Can be realized.

(Embodiment 3)
FIG. 6 is a longitudinal sectional view of a vertical scroll compressor according to Embodiment 3 of the present invention.

  FIG. 7 is a cross-sectional view of the electric motor viewed from the XX direction of FIG.

  The basic configuration of the present embodiment is the same as that shown in FIG. Also, the same components as those described in FIG.

  In the present embodiment, as shown in FIGS. 6 and 7, an end plate 3d is provided so as to surround the lower balance weight 3c.

  With the above configuration, the area of the opening 3e can be easily reduced by the end plate 3d without changing the shape or the like of the lower balance weight 3c, and the collision speed of the stator 3g to the lower coil end 3j can be increased. it can.

  As a result, the oil in the refrigerant can be easily separated to the lower coil end 3j of the stator 3g as much as possible, so that the amount of oil discharged from the discharge pipe 2 can be suppressed, and highly efficient and highly reliable. Can be realized.

  Although all of the first to third embodiments have been described by taking the scroll compressor as an example, the present invention is not based on the compression mechanism unit system, but a rotary compressor, a reciprocating compressor, a linear compressor, or the like. The same effect can be obtained with other types of configurations such as a compressor.

  Further, in a compressor mounted on a refrigeration cycle that uses oil and a refrigerant that easily dissolves as a working fluid, oil discharge to the outside of the compressor is directly linked to efficiency and reliability, so the configuration of the present invention is very effective. In particular, in a compressor using a refrigerant having a relatively low density, the gas flow rate inside the sealed container 1 is increased and the oil discharge amount is likely to increase. The effect can be expected.

  Examples of the refrigerant having a relatively low density include HC refrigerants typified by propane and isobutane, and refrigerants based on hydrofluoroolefin having a double bond between carbon and carbon typified by HFO1234yf.

  As described above, since the compressor according to the present invention can reduce the oil discharge amount in a wide operation range, the efficiency of the cycle in which the compressor is mounted can be increased under normal operation conditions. In addition to air conditioners and heat pump water heaters using refrigeration refrigerants, HCFC refrigerants, HC refrigerants, and HFO refrigerants, they can also be applied to applications such as air conditioners and heat pump water heaters using carbon dioxide, a natural refrigerant. .

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Discharge pipe 3 Electric motor 3a Rotor 3b Rotor channel | path 3c Lower balance weight 3d End plate 3e Opening part 3f Spacer 3g Stator 3j Lower coil end 12 Discharge port 13 Suction pipe 30 1st space 31 2nd space 33 Oil reservoir 50 Compression mechanism

Claims (4)

A sealed container having an oil sump at the bottom and connected to a discharge pipe;
A compression mechanism disposed in the sealed container;
An electric motor for driving the compression mechanism disposed on the discharge pipe side of the compression mechanism within the sealed container;
The refrigerant gas discharged from the discharge port provided in the compression mechanism section is
Flowing through a first space located between the compression mechanism and the electric motor;
Via a rotor passage provided inside the rotor of the electric motor and a second space formed on the side opposite to the compression mechanism portion of the electric motor,
In the compressor discharged from the discharge pipe,
A balance weight and an end plate are provided on the side of the rotor opposite to the compression mechanism,
An opening formed by the rotor, the balance weight, and the end plate,
The compressor, wherein the stator is disposed at a position where the area facing the coil end on the side opposite to the compression mechanism portion of the stator of the electric motor is maximized. The compressor according to claim 1, wherein a spacer is disposed between an end of the rotor and the balance weight. The compressor according to claim 1, wherein the end plate is disposed closer to the rotor than an end of the balance weight. The compressor according to any one of claims 1 to 3, wherein the end plate is disposed so as to surround the balance weight.

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