JPWO2020039489A1 - Compressor and refrigeration cycle apparatus including the same - Google Patents

Abstract

We provide highly reliable compressors with a simple configuration. The compressor (10) includes a closed container (1), an electric motor (2), a crankshaft (3), and a compression mechanism (5). Further, the compressor (10) includes a lower bearing (7a, 8a), an upper bearing (91), and a frame (9). The peripheral wall surface of the hole (h5) of the frame (9) functions as the upper bearing (91). The frame (9) has a tapered portion (92) that is inclined so that the height of the upper surface thereof becomes lower as it is closer to the crankshaft (3).

Description

The present invention relates to a compressor and the like.

As a compressor used in a refrigeration cycle device such as an air conditioner, for example, the technique described in Patent Document 1 is known. That is, in Patent Document 1, "a hermetic compressor including a main bearing and a sub-bearing that closes the compression chamber of the compression mechanism portion and a third bearing provided on the side opposite to the compression mechanism portion of the electric motor portion". Is described. Further, Patent Document 1 describes that an oil pump is provided at the lower end of the crankshaft.

JP, 2009-287473, A

The oil pump described in Patent Document 1 is a non-volume type, and it is known that its head is relatively small. In such a non-volume type oil pump, since it is difficult for the lubricating oil to reach the third bearing near the upper end of the crankshaft, insufficient lubrication of the third bearing may occur.

On the other hand, when a positive displacement pump (for example, a trochoid pump) is used instead of the non-positive displacement oil pump described in Patent Document 1, the lubricating oil is reliably pumped up to the third bearing. However, when the positive displacement pump is used, the number of parts is increased and the structure is complicated, and a certain amount of energy is required to drive the pump, which lowers the efficiency of the compressor.

Therefore, an object of the present invention is to provide a highly reliable compressor and the like with a simple configuration.

In order to solve the above-mentioned problems, a compressor according to the present invention is a hermetically sealed container in which lubricating oil is sealed, an electric motor installed inside the hermetically sealed container and having a stator and a rotor, and a vertical direction. It is provided with a shaft that extends and rotates integrally with the rotor, and a compression mechanism portion that compresses gas as the shaft rotates, and is installed below the rotor to support the shaft. A lower bearing, an upper bearing that is installed on the upper side of the rotor and axially supports the shaft, and a support member that is installed on the upper side of the rotor and provided with a hole through which the shaft is inserted. The upper wall of the hole functions as the upper bearing, or the upper bearing is installed in the hole, and the support member is inclined such that the height of the upper surface of the support member becomes lower as the shaft becomes closer to the shaft. It is characterized by having a tapered portion.

According to the present invention, it is possible to provide a highly reliable compressor and the like with a simple configuration.

It is a longitudinal section of a compressor concerning a 1st embodiment of the present invention. It is the figure which expanded the vicinity of the upper frame in the longitudinal section of the compressor concerning a 1st embodiment of the present invention. In the compressor which concerns on 1st Embodiment of this invention, it is sectional drawing seen from the III-III line of FIG. It is the figure which expanded the vicinity of the upper frame in the longitudinal section of the compressor concerning a 2nd embodiment of the present invention. It is the figure which expanded the vicinity of the upper frame in the longitudinal section of the compressor concerning a 3rd embodiment of the present invention. It is the figure which expanded the vicinity of the upper frame in the longitudinal section of the compressor concerning a 4th embodiment of the present invention. It is the figure which expanded the vicinity of the upper side frame in the longitudinal section of the compressor concerning a 5th embodiment of the present invention. It is explanatory drawing containing the refrigerant circuit of the air conditioner which concerns on 6th Embodiment of this invention.

«First embodiment»
<Compressor configuration>
FIG. 1 is a vertical sectional view of a compressor 10 according to the first embodiment.
The compressor 10 is a rotary compressor that compresses a gaseous refrigerant. As shown in FIG. 1, the compressor 10 includes a closed container 1, an electric motor 2, a crankshaft 3 (shaft), an oil pump 4, a compression mechanism portion 5, a sound deadening cover 6, frames 7, 8, 9 and.

The closed container 1 is a shell-shaped container that houses the electric motor 2, the compression mechanism 5, and the like, and is substantially closed. The closed container 1 includes a cylindrical case 1a, a lid chamber 1b welded near the upper end of the case 1a, and a bottom chamber 1c welded near the lower end of the case 1a.

Lubricating oil for enhancing the lubricity and sealability of the compressor 10 is enclosed in the closed container 1. As shown in FIG. 1, liquid lubricating oil is stored in the bottom portion (region J indicated by a dot) of the closed container 1. During the driving of the compressor 10, a part of the lubricating oil becomes mist, and the sealed container 1 is filled with the mist-like lubricating oil.

The suction pipe Pi shown in FIG. 1 is a pipe that guides a gaseous refrigerant into the compression chamber G, and is connected to the case 1 a of the closed container 1. Although not shown in FIG. 1, an accumulator that separates the refrigerant into gas and liquid is connected to the upstream side of the suction pipe Pi. The other discharge pipe Po is a pipe that discharges the gaseous refrigerant compressed in the compression chamber G, and is connected to the lid chamber 1b of the closed container 1.

The electric motor 2 is a drive source that rotates the crankshaft 3, and is installed inside the closed container 1 (near the center in the vertical direction). As shown in FIG. 1, the electric motor 2 includes a stator 2a, a rotor 2b, and a coil 2c. The stator 2 a is formed by stacking electromagnetic steel plates and is fixed to the inner peripheral wall of the closed container 1. The rotor 2b is formed by stacking electromagnetic steel plates, and is arranged inside the stator 2a in the radial direction. The coil 2c is a wire for passing an electric current, is wound in a predetermined manner, and is arranged near the stator 2a.

The crankshaft 3 is a shaft that rotates integrally with the rotor 2b as the electric motor 2 is driven. The crankshaft 3 extends in the vertical direction and is rotatably supported by the frames 7, 8 and 9. As shown in FIG. 1, the crankshaft 3 includes a main shaft 3a and an eccentric portion 3b.

The main shaft 3a is coaxially fixed to the rotor 2b of the electric motor 2. The eccentric portion 3b is a shaft that rotates while being eccentric with respect to the main shaft 3a, and is integrally formed with the main shaft 3a. The eccentric portion 3b is provided below the crankshaft 3 and is fixed to the inner peripheral surface of an annular roller 5b described later.

As shown in FIG. 1, a vertically elongated opening h1 that opens downward is provided near the lower end of the crankshaft 3, and the oil pump 4 is installed in this opening h1. The oil pump 4 is a non-volumetric pump that pumps lubricating oil. The oil pump 4 includes a plurality of thin plate-shaped metal pieces 4a, and the metal oil 4a rotates integrally with the crankshaft 3 so that the lubricating oil can be pumped up.

Further, the crankshaft 3 has a lubricating oil flow passage h2 provided along the central axis thereof. The lubricating oil flow path h2 communicates with a vertically long opening h1 provided with the oil pump 4. Then, the oil pump 4 causes liquid or mist-like lubricating oil to rise through the lubricating oil flow path h2.

The compression mechanism unit 5 is a mechanism that compresses a gaseous refrigerant (gas) as the crankshaft 3 rotates. That is, the compression mechanism unit 5 has a function of compressing the gaseous refrigerant sucked through the suction pipe Pi in the compression chamber G and discharging the compressed refrigerant. As shown in FIG. 1, the compression mechanism portion 5 includes a cylinder 5a and a roller 5b, and is arranged below the electric motor 2.

The cylinder 5a is a member that forms the compression chamber G together with the roller 5b and the frames 7 and 8, and has an annular (cylindrical) shape.
As described above, the roller 5b is an annular (cylindrical) member whose inner peripheral surface is fixed to the eccentric portion 3b of the crankshaft 3. The roller 5b revolves in the cylinder 5a as the electric motor 2 is driven. That is, the roller 5b revolves inside the cylinder 5a while contacting the inner peripheral surface of the cylinder 5a. The space between the cylinder 5a and the roller 5b functions as a compression chamber G that compresses a gaseous refrigerant (gas).

Further, a plate-shaped vane (not shown) whose end is pressed against the outer peripheral surface of the roller 5b by a pressure difference between the inside and outside of the compression mechanism portion 5 and a biasing force of a spring (not shown) is provided. The vane divides the compression chamber G between the cylinder 5a and the roller 5b into a high pressure side and a low pressure side. The gaseous refrigerant compressed on the high pressure side of the compression chamber G goes to the muffling cover 6 through a hole (not shown) provided in the frame 7 and a discharge valve (not shown).

The sound deadening cover 6 is a cover for suppressing noise accompanying the compression of the refrigerant, and is fixed to the upper surface of the frame 7.

The frames 7 and 8 have a function of forming the compression chamber G together with the cylinder 5a and the roller 5b, and a function of rotatably supporting the crankshaft 3. The frame 7 has a disk shape in a plan view, is fixed to the inner wall surface of the closed container 1, and is fixed to the upper side of the cylinder 5a. On the other hand, the frame 8 has a disk shape in a plan view and is fixed to the lower side of the cylinder 5a. In other words, the frames 5 and 8 fix the cylinder 5a in a state of being vertically sandwiched.

A hole h3 through which the crankshaft 3 is inserted is provided at the center of the frame 7. Similarly, a hole h4 through which the crankshaft 3 is inserted is provided at the center of the frame 8. The peripheral wall surfaces of these holes h3 and h4 are polished and function as a slide bearing that supports the crankshaft 3. The peripheral wall surface of the hole h3 that functions as a slide bearing is referred to as a lower bearing 7a. The peripheral wall surface of the hole h4 that functions as a slide bearing is referred to as the lower bearing 8a.

The remaining third frame 9 is a "supporting member" provided with a hole h5 through which the crankshaft 3 is inserted, and is installed above the rotor 2b. The frame 9 has a disk shape in a plan view and is fixed to the inner wall surface of the closed container 1.

The above-mentioned hole h5 is provided at the center of the frame 9. The peripheral wall surface of the hole h5 is polished and functions as a slide bearing that supports the crankshaft 3. The peripheral wall surface of the hole h5 that functions as a slide bearing is referred to as an upper bearing 91. The upper bearing 91 has a function of pivotally supporting the crankshaft 3, and is installed integrally with the frame 9 above the rotor 2b. Further, the frame 9 has a tapered portion 92 near the center. The details of the tapered portion 92 will be described later.

When the roller 5b revolves while being inscribed in the cylinder 5a by driving the electric motor 2, the volume of the compression chamber G is reduced and the gas refrigerant is compressed. The compressed gas refrigerant flows toward the sound deadening cover 6 through a hole (not shown) in the frame 7 and a discharge valve (not shown), and further flows out through a hole (not shown) in the sound deadening cover 6. .. In this way, the high-pressure gas refrigerant that has flowed into the space between the sound deadening cover 6 and the frame 9 is guided to the upper side of the frame 9 through the lightening hole h6 (see FIG. 3) of the frame 9, and , And is discharged through the discharge pipe Po.

FIG. 2 is an enlarged view of the vicinity of the upper frame 9 in the vertical cross section of the compressor.
As shown in FIG. 2, the frame 9 includes a tapered portion 92 in addition to the upper bearing 91 described above. The tapered portion 92 is provided around the upper bearing 91 in the frame 9. The tapered portion 92 is a tapered portion that makes the mist-like lubricating oil into oil droplets, and further guides the oil droplets of lubricating oil to the upper bearing 91.

As shown in FIG. 2, the tapered portion 92 is inclined so that the height of the upper surface thereof becomes lower as it gets closer to the crankshaft 3. That is, the upper surface of the tapered portion 92 has a predetermined angle θ1 with reference to the radial direction of the crankshaft 3. Note that FIG. 2 illustrates a configuration in which the predetermined angle θ1 is an acute angle of less than 45°, but is not limited to this.

When the crankshaft 3 rotates, the mist-like lubricating oil existing around the upper end of the crankshaft 3 diffuses radially outward due to centrifugal force together with the gas refrigerant, and further adheres to the tapered portion 92 to form oil droplets. To do. The lubricating oil thus formed into oil droplets is collected by its own weight along the inclined surface of the taper portion 92 toward the center side and guided to the upper bearing 91.

In addition, the lubricating oil that adheres to the ceiling surface of the lid chamber 1b of the closed container 1 (see FIG. 1) and turns into oil droplets may fall onto the tapered portion 92. The lubricating oil that has dropped to the tapered portion 92 in this way is also collected on the center side along the inclined surface of the tapered portion 92 and guided to the upper bearing 91. As a result, the upper bearing 91 in the vicinity of the upper end of the crankshaft 3 can be appropriately lubricated even with the configuration using the non-volume type oil pump 4 (see FIG. 1) having a relatively small lift.

The lower end of the tapered portion 92 is preferably connected to the upper bearing 91. This is because the lubricating oil flowing along the inclined surface of the tapered portion 92 is guided to the upper bearing 91 as it is.

In addition, as shown in FIG. 2, it is preferable that the upper end of the crankshaft 3 projects above the tapered portion 92. As a result, as the crankshaft 3 rotates, the mist-like lubricating oil is diffused around the crankshaft 3, so that the lubricating oil adheres to the tapered portion 92 and is easily converted into oil droplets.

FIG. 3 is a sectional view taken along the line III-III in FIG.
In the example shown in FIG. 3, four circular lightening holes h6 are provided in the frame 9. A tapered portion 92 is provided radially inward of the lightening hole h6 with respect to the crankshaft 3. By providing such a lightening hole h6, the weight of the frame 9 can be reduced. In addition, the lightening hole h6 also has a function of guiding the compressed high-pressure gas refrigerant or lubricating oil to the upper side of the frame 9 via itself. Further, by providing the tapered portion 92 radially inward of the lightening hole h6, punching of the lightening hole h6 is facilitated.

In addition, as shown in FIG. 1, other members (shields such as a cover (not shown) and a pipe through which lubricating oil flows) may not be arranged between the ceiling surface of the closed container 1 and the frame 9. preferable. That is, it is preferable that the tapered portion 92 be open to the ceiling surface of the closed container 1. As a result, the mist-like lubricating oil existing in the space between the ceiling surface of the closed container 1 and the frame 9 adheres to the surface of the tapered portion 92 without adhering to other members (not shown). Therefore, the lubricating oil easily becomes oil droplets in the tapered portion 92.

Further, as shown in FIG. 1, it is preferable that no other member (a predetermined shield not shown) is arranged between the electric motor 2 and the frame 9. As a result, the liquid lubricating oil that has passed through the tapered portion 92 and lubricated the upper bearing 91 does not adhere to other members (not shown) and is likely to become mist again. The lubricating oil that has been misted again is guided to the upper side of the frame 9 through the lightening hole h6 (see FIG. 3).

<Effect>
According to the first embodiment, the lower bearings 7a and 8a (see FIG. 1) pivotally support the lower portion of the crankshaft 3, and the upper bearing 91 pivotally supports the upper portion of the crankshaft 3. In this way, since the crankshaft 3 extending in the vertical direction is supported near both ends thereof, it is possible to suppress vibration and noise accompanying the driving of the compressor 10.

Further, the tapered portion 92 (see FIG. 2) of the frame 9 is inclined such that the height of the upper surface thereof becomes lower as it gets closer to the crankshaft 3. Therefore, due to the centrifugal force generated by the rotation of the crankshaft 3, the mist-like lubricating oil that has moved outward in the radial direction adheres to the taper portion 92 to form oil droplets, and this lubricating oil also travels through the taper portion 92 and moves upward. It is guided to the bearing 91. In addition, the lubricating oil in the form of oil drops that has dropped from the lid chamber 1b to the tapered portion 92 is also guided to the upper bearing 91 along the tapered portion 92. As a result, the upper bearing 91 is properly lubricated, and the reliability of the compressor 10 can be improved.

Even if the non-volumetric oil pump 4 having a relatively small lift is used, as described above, a sufficient amount of lubricating oil is supplied to the upper bearing 91 through the tapered portion 92. As described above, the upper bearing 91 is sufficiently lubricated without using a positive displacement pump (for example, a trochoid pump), so that the compressor 10 having a simple structure and high reliability can be provided.

«Second embodiment»
The second embodiment is different from the first embodiment in the angle θ2 (see FIG. 4) of the upper surface of the tapered portion 92. Note that the other configurations are the same as those in the first embodiment (see FIG. 1). Therefore, only the parts different from the first embodiment will be described, and the description of the overlapping parts will be omitted.

FIG. 4 is an enlarged view of the vicinity of the upper frame 9A in the vertical cross section of the compressor according to the second embodiment.
As shown in FIG. 4, the frame 9A (support member) includes a tapered portion 92A around the crankshaft 3. The upper surface of the tapered portion 92A has an angle θ2 of 45° or more and less than 85° with reference to the radial direction of the crankshaft 3. As a result, when the mist-like lubricating oil diffuses outward in the radial direction as the crankshaft 3 rotates, this lubricating oil easily adheres to the tapered portion 92A and becomes oil droplets. Further, since the angle θ2 is relatively large, the lubricating oil that has adhered to the tapered portion 92A and turned into oil droplets easily flows down to the upper bearing 91 along the tapered portion 92A by its own weight.

<Effect>
According to the second embodiment, the angle θ2 of the upper surface of the tapered portion 92A based on the radial direction of the crankshaft 3 is 45° or more and 85° or less. Therefore, as described above, the lubricating oil easily adheres to the tapered portion 92A and is easily made into oil droplets, and the lubricating oil that has become oil droplets easily flows down to the upper bearing 91 along the tapered portion 92A. As a result, the upper bearing 91 is properly lubricated.

<<Third Embodiment>>
In the third embodiment, the range of the tapered portion 92B (see FIG. 5) in the radial direction is wider than that in the first embodiment (see FIG. 1). Note that other configurations are the same as those in the first embodiment. Therefore, only the parts different from the first embodiment will be described, and the description of the overlapping parts will be omitted.

FIG. 5 is an enlarged view of the vicinity of the upper frame 9B in the vertical cross section of the compressor according to the third embodiment.
As shown in FIG. 5, the frame 9B (support member) includes a tapered portion 92B. Further, in the frame 9B, a tapered portion 92B is provided up to the vicinity of the case 1a (side wall) of the closed container 1. That is, in the third embodiment, the range of the tapered portion 92B in the radial direction is wider than that in the first embodiment (see FIG. 2). As a result, when the lubricating oil drips from the ceiling surface of the lid chamber 1b (see FIG. 1), most of the lubricating oil falls on the tapered portion 92B. This lubricating oil is guided to the upper bearing 91 along the tapered portion 92B.

<Effect>
According to the third embodiment, since the tapered portion 92B is provided up to the vicinity of the case 1a of the closed container 1, most of the lubricating oil that has dropped from the ceiling surface of the lid chamber 1b (see FIG. 1) is tapered portion 92B. Is guided to the upper bearing 91. As a result, the upper bearing 91 is properly lubricated.

<<Fourth Embodiment>>
The fourth embodiment is different from the first embodiment in that the upper surface of the tapered portion 92C (see FIG. 6) has a polygonal shape in a longitudinal sectional view. Note that the other configurations are the same as those in the first embodiment (see FIG. 1). Therefore, only the parts different from the first embodiment will be described, and the description of the overlapping parts will be omitted.

FIG. 6 is an enlarged view of the vicinity of the upper frame 9C in the vertical cross section of the compressor according to the fourth embodiment.
As shown in FIG. 6, the frame 9C (support member) includes a tapered portion 92C around the crankshaft 3. The upper surface of the tapered portion 92C has a polygonal line shape in a vertical sectional view. Explaining from another point of view, the upper surface of the tapered portion 92C has a first tapered region 92Ca that has an annular shape in a plan view and a second tapered region 92Cb that extends inward of the first tapered region 92Ca in the radial direction. ing.

The angle θ3 of the first tapered region 92Ca with respect to the radial direction of the crankshaft 3 is, for example, 5° or more and less than 45°. The first tapered region 92Ca is provided in a wider area than the second tapered region 92Cb in plan view. As a result, when the lubricating oil drops from the ceiling surface of the lid chamber 1b (see FIG. 1), the lubricating oil easily adheres to the first taper region 92Ca. The lubricating oil that has adhered to the first tapered region 92Ca sequentially travels along the upper surfaces of the first tapered region 92Ca and the second tapered region 92Cb and is guided to the upper bearing 91.

On the other hand, the angle θ4 of the second tapered region 92Cb with respect to the radial direction of the crankshaft 3 is, for example, 45° or more and less than 85°. The second tapered region 92Cb as described above is provided on the radially inner side of the first tapered region 92Ca. That is, the angle of the upper surface of the polygonal taper portion 92C with respect to the radial direction of the crankshaft 3 increases as it approaches the crankshaft 3 (θ3<θ4).

Since the angle θ4 of the second tapered region 92Cb is relatively large as described above, the mist-like lubricating oil existing around the upper end of the crankshaft 3 is generated by the centrifugal force generated by the rotation of the crankshaft 3 in the second tapered region 92Cb. It becomes easy to adhere to. The lubricating oil that has adhered to the second taper region 92Cb and turned into oil droplets is guided to the upper bearing 91 along the second taper region 92Cb.

<Effect>
According to the fourth embodiment, the lubricating oil can be collected in a relatively wide range in the first tapered region 92Ca of the frame 9C. Further, since the angle θ4 of the second tapered region 92Cb is relatively large, the lubricating oil is likely to adhere due to the centrifugal force caused by the rotation of the crankshaft 3. Therefore, the upper bearing 91 is properly lubricated.

<<Fifth Embodiment>>
The fifth embodiment differs from the first embodiment (see FIG. 1) in that a radial communication hole h7 communicating with the lubricating oil flow path h2 (see FIG. 7) is provided near the upper end of the crankshaft 3. Are different. Note that other configurations are the same as those in the first embodiment. Therefore, only the parts different from the first embodiment will be described, and the description of the overlapping parts will be omitted.

FIG. 7 is an enlarged view of the vicinity of the upper frame 9 in the vertical cross section of the compressor according to the fifth embodiment.
As shown in FIG. 7, the crankshaft 3D has a lubricating oil flow path h2 provided along the central axis thereof. A radial communication hole h7 that communicates with the lubricating oil flow path h2 is provided near the upper end of the crankshaft 3D. The outlet of this communication hole h7 faces the tapered portion 92. Then, the lubricating oil that flows upward in the lubricating oil flow path h2 flows radially outward through the communication hole h7 by the centrifugal force that accompanies the rotation of the crankshaft 3, and heads for the tapered portion 92. ing.

In addition, since the non-volumetric oil pump 4 (see FIG. 1) has a relatively small lift, the liquid lubricating oil may not reach the upper end of the crankshaft 3 when flowing in the lubricating oil passage h2. There is also. However, even in such a case, the mist-like lubricating oil rises through the lubricating oil flow path h2, and further the mist-like lubricating oil reaches the upper end of the crankshaft 3 (that is, the communication hole h7). Often reached. Then, the mist-like lubricating oil flowing through the communication hole h7 adheres to the tapered portion 92 to form oil droplets, and the oil droplets are guided to the upper bearing 91 along the inclined surface of the tapered portion 92. Get burned.

<Effect>
According to the fifth embodiment, since the radial communication hole h7 that communicates with the lubricating oil flow path h2 is provided near the upper end of the crankshaft 3, the centrifugal force associated with the rotation of the crankshaft 3 causes the lubricating oil to flow. It becomes easy to adhere to the taper portion 92 via the communication hole h7. As a result, the upper bearing 91 is properly lubricated.

«Sixth Embodiment»
In the sixth embodiment, an air conditioner W (refrigeration cycle device: see FIG. 8) including the compressor 10 (see FIG. 1) described in the first embodiment will be described.

FIG. 8 is an explanatory diagram including the refrigerant circuit Q of the air conditioner W.
The solid arrow in FIG. 8 indicates the flow of the refrigerant during the heating operation.
In addition, the broken line arrow in FIG. 8 indicates the flow of the refrigerant during the cooling operation.
Further, in FIG. 8, the accumulator provided on the suction side of the compressor 10 is not shown.

The air conditioner W is a “refrigeration cycle device” that circulates a refrigerant in a refrigeration cycle (heat pump cycle) to perform air conditioning. As shown in FIG. 8, the air conditioner W includes a compressor 10, an outdoor heat exchanger 20, an outdoor fan 30, an expansion valve 40, a four-way valve 50, an indoor heat exchanger 60, and an indoor fan 70. And are equipped with.

In the example shown in FIG. 8, the compressor 10, the outdoor heat exchanger 20, the outdoor fan 30, the expansion valve 40, and the four-way valve 50 are provided in the outdoor unit Wo. On the other hand, the indoor heat exchanger 60 and the indoor fan 70 are provided in the indoor unit Wi.

The compressor 10 is a device that compresses a gaseous refrigerant, and has the same configuration as that of the first embodiment (see FIG. 1 ).
The outdoor heat exchanger 20 is a heat exchanger that performs heat exchange between the refrigerant flowing through the heat transfer pipe (not shown) and the outside air sent from the outdoor fan 30.

The outdoor fan 30 is a fan that sends outside air to the outdoor heat exchanger 20. The outdoor fan 30 includes an outdoor fan motor 30a, which is a drive source, and is installed near the outdoor heat exchanger 20.

The indoor heat exchanger 60 performs heat exchange between the refrigerant flowing through the heat transfer pipe (not shown) and the indoor air (air in the air-conditioned space) sent from the indoor fan 70. Is.
The indoor fan 70 is a fan that sends indoor air to the indoor heat exchanger 60. The indoor fan 70 includes an indoor fan motor 71, which is a drive source, and is installed near the indoor heat exchanger 60.

The expansion valve 40 has a function of reducing the pressure of the refrigerant condensed in the "condenser" (one of the outdoor heat exchanger 20 and the indoor heat exchanger 60). The refrigerant decompressed by the expansion valve 40 is guided to the "evaporator" (the other of the outdoor heat exchanger 20 and the indoor heat exchanger 60).

The four-way valve 50 is a valve that switches the flow path of the refrigerant according to the operation mode of the air conditioner W. For example, during the cooling operation (see the broken line arrow in FIG. 8 ), the compressor 10, the outdoor heat exchanger 20 (condenser), the expansion valve 40, and the indoor heat exchanger 60 (evaporator) are connected to the four-way valve 50. The refrigerant circulates in the refrigeration cycle in the refrigerant circuits Q sequentially connected via the.

Further, during the heating operation (see the solid arrow in FIG. 8 ), the compressor 10, the indoor heat exchanger 60 (condenser), the expansion valve 40, and the outdoor heat exchanger 20 (evaporator) are connected to the four-way valve 50. The refrigerant circulates in the refrigeration cycle in the refrigerant circuits Q sequentially connected via the.

As described above, in the refrigerant circuit Q, the refrigerant circulates through the compressor 10, the “condenser”, the expansion valve 40, and the “evaporator” in order. Devices such as the compressor 10, the outdoor fan 30, the expansion valve 40, and the indoor fan 70 are driven based on a command from a control device (not shown).

<Effect>
According to the sixth embodiment, it is possible to provide the air conditioner W that includes the compressor 10 that has low vibration and noise and is highly reliable.

≪Modification≫
Although the compressor 10 and the like according to the present invention have been described in the above embodiments, the present invention is not limited to these descriptions, and various modifications can be made.
For example, in each of the embodiments, the configuration in which the peripheral wall surface of the hole h5 (see FIG. 1) provided in the central portion of the frame 9 functions as the upper bearing 91 has been described, but the configuration is not limited to this. That is, the “upper bearing”, which is separate from the frame 9, may be installed in the hole h5 of the frame 9. Such “upper bearing” may be a ball bearing or another type of bearing. The same applies to the lower bearings 7a and 8a.

Further, in the first embodiment, the configuration in which the frame 9 is provided with the four lightening holes h6 (see FIG. 3) has been described, but the number of the lightening holes h6 can be appropriately changed. That is, at least one lightening hole h6 may be provided in the frame 9.

In addition, in the fourth embodiment (see FIG. 6 ), a configuration has been described in which the angles θ3 and θ4 of the upper surface of the taper portion 92C having a fold line shape in the longitudinal sectional view are larger as they are closer to the crankshaft 3, but the invention is not limited thereto. .. For example, the angle of the upper surface of the taper portion (not shown) having a polygonal line shape may be smaller as it is closer to the crankshaft 3. Even with such a configuration, the lubricating oil attached to the tapered portion (not shown) can be appropriately guided to the upper bearing 91.

Further, in each embodiment, the configuration in which the lubricating oil flow path h2 provided along the central axis of the crankshaft 3 (see FIG. 1) communicates with the lower opening h1 has been described. Not exclusively. For example, in the configuration in which the lubricating oil flow path h2 does not communicate with the opening h1, the radial communication hole h7 (see FIG. 7) described in the fifth embodiment may be provided. Even with such a configuration, the mist-like lubricating oil existing inside the lubricating oil flow path h2 is guided to the outside in the radial direction via the communication hole h7 by the centrifugal force associated with the rotation of the crankshaft 3, and is guided to the tapered portion 92. Adhere to. As a result, the lubricating oil is guided to the upper bearing 91 through the tapered portion 92, so that the upper bearing 91 is properly lubricated.

Further, in each embodiment, the configuration in which the compressor 10 includes the oil pump 4 (see FIG. 1) has been described, but the oil pump 4 may be appropriately omitted. Further, the compressor 10 described in each embodiment is also applicable to the compression of "gas" other than the refrigerant.

Moreover, in each embodiment, the case where the compressor 10 is a rotary type has been described, but the invention is not limited to this. That is, each embodiment can be applied to other types of compressors such as scroll type compressors.
Further, in the sixth embodiment, the case where the “refrigeration cycle device” including the compressor 10 is the air conditioner W (see FIG. 8) has been described, but the present invention is not limited thereto. That is, the “refrigeration cycle device” including the compressor 10 may be a chiller, a water heater, etc., in addition to the refrigerator and the refrigerator.

Further, the respective embodiments can be appropriately combined. For example, the second embodiment and the fifth embodiment may be combined. That is, in a configuration in which the upper surface of the tapered portion 92A has a predetermined angle θ2 (second embodiment: see FIG. 4), a radial communication hole h7 communicating with the lubricating oil flow path h2 (fifth embodiment: see FIG. 7). May be provided.

In addition, each embodiment is described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to one including all the configurations described. Further, it is possible to add/delete/replace other configurations with respect to a part of the configurations of the respective embodiments.
In addition, the above-mentioned mechanisms and configurations are shown to be necessary for explanation, and not all the mechanisms and configurations are shown in the product.

1 Airtight container 1a Case (side wall)
2 electric motor 2a stator 2b rotor 2c coil 3,3D crankshaft (axis)
4 oil pump 5 compression mechanism part 5a cylinder 5b roller 6 muffling cover 7 frame 8 frame 9, 9A, 9B, 9C frame (support member)
10 compressor 20 outdoor heat exchanger (condenser/evaporator)
40 Expansion valve 60 Indoor heat exchanger (evaporator/condenser)
7a, 8a Lower bearing 91 Upper bearing 92, 92A, 92B, 92C Tapered portion G Compression chamber Q Refrigerant circuit W Air conditioner h1 Opening h2 Lubricating oil flow passage h5 Hole h6 Lightening hole h7 Communication hole

In order to solve the above-mentioned problems, a compressor according to the present invention is a hermetically sealed container in which lubricating oil is sealed, an electric motor installed inside the hermetically sealed container and having a stator and a rotor, and a vertical direction. It is provided with a shaft that extends and rotates integrally with the rotor, and a compression mechanism portion that compresses gas as the shaft rotates, and is installed below the rotor to support the shaft. A lower bearing, an upper bearing that is installed on the upper side of the rotor and axially supports the shaft, and a support member that is installed on the upper side of the rotor and provided with a hole through which the shaft is inserted. The upper wall of the hole functions as the upper bearing, or the upper bearing is installed in the hole, and the support member is inclined such that the height of the upper surface of the support member becomes lower as it approaches the shaft. to have a tapered portion which, near the upper end of the shaft protrudes above the said tapered portion, said shaft has a lubricating oil flow path provided along the center axis, in the axial, A radial communication hole communicating with the lubricating oil flow passage is provided near the upper end, which is a portion protruding above the taper portion, and an outlet of the communication hole faces the tapered portion. and characterized in that out.

Claims (11)

A closed container containing lubricating oil,
An electric motor having a stator and a rotor installed inside the closed container,
A shaft extending in the vertical direction and rotating integrally with the rotor,
And a compression mechanism portion that compresses gas with the rotation of the shaft,
A lower bearing installed below the rotor and supporting the shaft;
An upper bearing that is installed on the upper side of the rotor and supports the shaft,
A support member provided on the upper side of the rotor and provided with a hole through which the shaft is inserted;
The peripheral wall surface of the hole functions as the upper bearing, or the upper bearing is installed in the hole,
The said support member is a compressor which has a taper part which inclines so that the height of the upper surface may become low, so that it is close to the said shaft. The compressor according to claim 1, wherein an upper end of the shaft projects above the tapered portion. The support member is provided with at least one lightening hole,
The compressor according to claim 1, wherein the tapered portion is provided radially inward of the lightening hole with respect to the shaft. The other member is not arrange|positioned between the ceiling surface of the said airtight container, and the said support member, The compressor of Claim 1 characterized by the above-mentioned. The other member is not arrange|positioned between the said electric motor and the said support member, The compressor of Claim 4 characterized by the above-mentioned. The compressor according to claim 1, wherein an upper surface of the tapered portion has an angle of 45° or more and less than 85° with respect to a radial direction of the shaft. The compressor according to claim 1, wherein the tapered portion is provided in the support member up to the vicinity of a side wall of the closed container. The upper surface of the tapered portion has a polygonal line shape in a vertical cross-sectional view,
The compressor according to claim 1, wherein an angle of an upper surface of the taper portion having a polygonal line shape with respect to a radial direction of the shaft is larger as the shaft is closer to the shaft. The shaft has a lubricating oil passage provided along the central axis thereof,
Near the upper end of the shaft, a radial communication hole that communicates with the lubricating oil flow path is provided.
The compressor according to claim 1, wherein an outlet of the communication hole faces the tapered portion. The compression mechanism section includes an annular cylinder, a roller that revolves in the cylinder when the electric motor is driven, and a space between the cylinder and the roller serves as a compression chamber that compresses gas. The compressor according to any one of claims 1 to 9, which functions. A refrigerant circuit in which a refrigerant circulates sequentially through a compressor, a condenser, an expansion valve, and an evaporator,
The compressor is
A closed container containing lubricating oil,
An electric motor having a stator and a rotor installed inside the closed container,
A shaft extending in the vertical direction and rotating integrally with the rotor,
With a compression mechanism section that compresses gas with the rotation of the shaft,
A lower bearing installed below the rotor and supporting the shaft;
An upper bearing that is installed on the upper side of the rotor and supports the shaft,
A support member installed on the upper side of the rotor and provided with a hole through which the shaft is inserted;
The peripheral wall surface of the hole functions as the upper bearing, or the upper bearing is installed in the hole,
The refrigeration cycle apparatus having a taper portion in which the support member is inclined so that the height of the upper surface of the support member becomes lower as it gets closer to the axis.

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