JP2017053222A - Hermetic scroll compressor and refrigeration air conditioning equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an effect for preventing flow-out of oil to the exterior of a compressor while suppressing increase in size thereof.SOLUTION: A hermetic scroll compressor comprises a hermetic container housing a scroll compressing element and an electric motor, a suction port and a discharge port formed at a fixed scroll, and a suction pipe and a discharge pipe fixed to the hermetic container. In addition, there is provided a discharge gas flowing-out member which is provided on the fixed scroll to cover an outlet side of the discharge port, forms a discharge space for the discharge gas, and forms a discharge gas flow passage for guiding the discharge gas discharged into the discharge space to an outer peripheral side. A ring-shaped discharge gas swiveling area is formed between an outer circumferential surface of the discharge gas flowing-out member and an inner wall surface of the hermetic container. The discharge gas flow passage in the discharge gas flowing-out member flows out the discharge gas into the discharge gas swiveling area to perform a swiveling motion. An upper part of the discharged gas swiveling area is provided with a baffle plate for guiding the discharge gas in this discharge gas swiveling area toward a central side of the hermetic container.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hermetic scroll compressor and a refrigeration air conditioner, and more particularly to a hermetic scroll compressor used in a refrigeration cycle such as an air conditioner and a refrigerator, and a refrigeration air conditioner equipped with the hermetic scroll compressor. It is related.

  The hermetic scroll compressor includes a scroll compression element, an electric motor that drives the scroll compression element, a sealed container that houses the scroll compression element and the electric motor, a suction port and a discharge port formed in the fixed scroll, A suction pipe connected to the suction port, a discharge pipe that is fixed to the hermetic container and guides discharge gas flowing out from the discharge port of the fixed scroll to the outside of the compressor, and the like.

  The scroll compression element includes a fixed scroll having a spiral scroll wrap standing upright on an end plate (end plate) surface and a turning scroll as main components. In this scroll compression element, the volume of the working chamber formed between both scroll wraps is reduced by revolving motion of the orbiting scroll with a substantially constant radius without rotating relative to the fixed scroll, The working fluid is compressed. The hermetic scroll compressor is a high pressure type hermetic scroll compressor in which the pressure in the hermetic container is the discharge pressure (high pressure) of the compressor.

  In order to lubricate each sliding portion in the scroll compression element and cool the electric motor, the working fluid is sucked into the scroll compression element and compressed in a state where a small amount of lubricating oil is mixed in the working fluid. Is discharged. When the working fluid is discharged from the sealed container of the compressor, a part of the lubricating oil is mixed into the working fluid. To ensure the reliability of the compressor and improve the performance of the refrigeration air conditioner Therefore, it is desired to keep the ratio (oil rate) of lubricating oil in the working fluid discharged from the compressor to the outside as low as possible.

  In recent years, in order to reduce the size and cost of refrigeration air conditioners, compressors tend to be smaller and faster. In order to realize this small size and high speed, it is important to reduce the oil rate of the compressor. Recently, from the viewpoint of preventing global warming, R32 refrigerant having a small warming coefficient has been attracting attention as a refrigerant for refrigeration and air-conditioning apparatuses, instead of the conventional R410A refrigerant.

  In addition, as what reduces the ratio of the lubricating oil in the working fluid discharged outside, there exists what was described in Unexamined-Japanese-Patent No. 2007-315366 (patent document 1). The thing of this patent document 1 WHEREIN: What is equipped with the centrifugal-type oil separation means which isolate | separates the lubricating oil contained in a refrigerant | coolant between a discharge chamber and discharge piping in a sealed scroll compressor is described. . Further, the oil separation means is provided with a hollow body part, a refrigerant inlet part and an oil outlet part, and the refrigerant passing through the oil separation means is guided to the inlet of the discharge pipe.

JP 2007-315366 A

  In the thing of the said patent document 1, since this is arrange | positioned in the airtight container using the oil separation means similar to a general centrifugal oil separator, the refrigerant | coolant (discharge) in the said oil separation means In order to prevent remixing of the separated oil with the gas), it is necessary to increase the size of the oil separating means, that is, the diameter and the height of the hollow body portion. Since the closed container is also increased in size, there is a problem that the scroll compressor is increased in size and the manufacturing cost is increased.

  Further, in this Patent Document 1, no consideration is given to quickly recovering the separated lubricating oil to the oil sump at the bottom of the housing, and the ratio of the lubricating oil in the working fluid discharged to the outside from the compressor (Oil rate) cannot be kept low, and there is a problem that a sufficient oil spill prevention effect cannot be obtained.

  An object of the present invention is to obtain a hermetic scroll compressor and a refrigeration air-conditioning apparatus that can improve the oil spill prevention effect to the outside of the compressor while suppressing an increase in size.

  To achieve the above object, the present invention provides a scroll compression element including a fixed scroll and a turning scroll, an electric motor that drives the scroll compression element, a sealed container that houses the scroll compression element and the electric motor, and the fixed A suction port and a discharge port formed in the scroll, a suction pipe connected to the suction port, and a discharge pipe that is fixed to the sealed container and guides a discharge gas flowing out from the discharge port of the fixed scroll to the outside of the compressor. The hermetic scroll compressor is provided in the fixed scroll so as to cover an outlet side of the discharge port in the fixed scroll, and forms a discharge space for discharge gas discharged from the discharge port. A discharge gas that forms a discharge gas flow path that guides the discharge gas discharged to the outer peripheral side A discharge member, and an annular discharge gas swirl region is formed between the outer peripheral surface of the discharge gas outflow member and the inner wall surface of the sealed container, and the discharge gas flow path of the discharge gas outflow member A shape for allowing the discharge gas to flow into the gas swirl region so as to swirl, and a baffle plate for guiding the discharge gas in the discharge gas swirl region toward the center side of the hermetic container is provided above the discharge gas swirl region. It is characterized by.

  Another feature of the present invention is that in the refrigerating and air-conditioning apparatus in which the compressor, the condenser, the expansion device, and the evaporator are connected by refrigerant piping to form a refrigeration cycle, R32 is used as the refrigerant of the refrigeration cycle, and That is, the above-described hermetic scroll compressor is used as the compressor.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect which can obtain the hermetic scroll compressor and refrigeration air conditioner which can improve the oil outflow prevention effect to the compressor exterior, suppressing size increase.

It is a longitudinal cross-sectional view which shows Example 1 of the hermetic scroll compressor of this invention. It is a principal part expanded sectional view of FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 3 is a cross-sectional view taken along line B-B in FIG. 2. FIG. 3 is an enlarged cross-sectional view of a main part showing an enlarged vicinity of a discharge gas swirl region shown in FIG. 2. It is a diagram which shows the experimental result of the relationship between the ratio of the width | variety of the baffle board with respect to the width | variety of the discharge gas turning area | region in Example 1 of this invention, and an oil circulation rate ratio. It is a diagram which shows the experimental result of the relationship between ratio of the opening height of a baffle board with respect to the width | variety of the discharge gas turning area | region in Example 1 of this invention, and an oil circulation rate ratio. It is a figure explaining the structure of the discharge gas outflow member in Example 1 of this invention, and is a plane sectional view of the part of a discharge gas outflow member. It is a figure which shows the other example of a discharge gas outflow member shown in FIG. 8, and is a figure equivalent to FIG. FIG. 5 is a longitudinal sectional view showing a second embodiment of the hermetic scroll compressor of the present invention, which corresponds to FIG. 2. It is a principal part enlarged view of FIG. It is CC sectional view taken on the line of FIG. It is a perspective view of the baffle board shown in FIG. It is a refrigerating cycle block diagram which shows the refrigerating air conditioning apparatus provided with the hermetic scroll compressor of this invention.

  Hereinafter, specific embodiments of the hermetic scroll compressor and the refrigerating and air-conditioning apparatus of the present invention will be described with reference to the drawings. In each figure, the parts denoted by the same reference numerals indicate the same or corresponding parts.

A first embodiment of a hermetic scroll compressor 30 according to the present invention will be described with reference to FIGS.
First, the overall configuration of the hermetic scroll compressor according to the first embodiment will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing Embodiment 1 of the hermetic scroll compressor of the present invention.

  In FIG. 1, reference numeral 1 denotes an airtight container. The airtight container 1 contains a scroll compression element 20 and an electric motor 7 for driving the scroll compression element 20. The scroll compression element 20 has a fixed scroll 2 and a turning scroll 3 as its main components. The sealed container 1 has a high-pressure atmosphere into which discharge gas is introduced. Further, a back pressure chamber 21 that is maintained at an intermediate pressure between the high pressure and the low pressure is formed in the back surface portion of the orbiting scroll 3. The scroll compression element 20 is composed of an end plate (end plate) and a spiral scroll wrap standing upright from the end plate, both of the fixed scroll 2 and the orbiting scroll 3.

  The fixed scroll 2 is provided with a suction port 2a at the outer periphery of the scroll wrap and a discharge port 2b at the center of the scroll wrap. A turning bearing 3a is provided at the center of the surface of the orbiting scroll 3 opposite to the scroll wrap.

  Reference numeral 4 denotes a crankshaft, and an upper end portion of the crankshaft 4 is an eccentric portion 4 a, and the eccentric portion 4 a is inserted into the orbiting bearing 3 a of the orbiting scroll 2. Therefore, when the crankshaft 4 rotates, the orbiting scroll 2 is configured to perform an orbiting motion by the eccentric portion 4a. An oil supply hole 4b is formed in the crankshaft 4 so as to penetrate the inside of the shaft.

  Reference numeral 5 denotes a frame that supports the crankshaft 4 via a main bearing 5a, and the back pressure chamber 21 is formed by the frame 5 and the end plate back surface of the orbiting scroll 2. The main bearing 5 a is provided at the center of the frame 5. An oil return 5b collects the lubricating oil that has finished lubrication of the sliding portions of the main bearing 5a and the slewing bearing 3a and guides it through an oil return pipe 11 to an oil sump 17 formed at the bottom of the sealed container 1. It is a flow path. The oil return pipe 11 is connected to the oil return channel 5 b of the frame 5. Reference numeral 6 denotes an Oldham ring which is engaged with the orbiting scroll 3 and the frame 5 to prevent the orbiting scroll 3 from rotating and to make an orbiting motion.

  The electric motor 7 includes a stator 7a fixed in the hermetic container 1 and a rotor 7b fixed to the crankshaft 4 and disposed at the center of the stator. By driving the electric motor 7, the rotor 7b rotates to drive the crankshaft 4 to rotate. 8 is a secondary bearing for supporting the shaft end of the crankshaft 4 opposite to the eccentric portion 4a. The secondary bearing 8 is connected to the secondary bearing frame 9 fixed to the inner surface of the hermetic container 1 on the secondary bearing housing. It is attached via 9a. Reference numeral 10 denotes an oil pump attached to the lower end portion of the crankshaft 4. When the crankshaft 4 rotates, the bearings of the bearings pass through the oil holes 4 b formed in the crankshaft 4 by the pumping action of the oil pump 10. Supply lubricating oil to the sliding part.

  12 is a suction pipe for guiding a refrigerant (hereinafter also referred to as a working fluid) flowing through the refrigeration cycle constituting the refrigeration air-conditioning apparatus to the suction port 2a of the compressor. The suction pipe 12 penetrates the sealed container 1, The fixed scroll 2 is connected to the suction port 2a. 15 is a discharge pipe for discharging the compressed refrigerant gas to the refrigeration cycle. The discharge pipe penetrates the sealed container 1 and discharges the discharge gas discharged from the discharge port 2b of the fixed scroll 2 to the closed container 1. Lead outside. Lubricating oil is stored in the oil reservoir 17 at the bottom of the sealed container 1.

  Reference numeral 16 denotes a back pressure sealing mechanism that seals between a lower end of a boss portion provided with the orbiting bearing 3 a of the orbiting scroll 3 and the frame 5. By the back pressure sealing mechanism 16, the back pressure chamber 21 The high pressure portion of the discharge gas atmosphere in the sealed container 1 is sealed, and the back pressure chamber 21 is held at a pressure intermediate between high pressure (discharge pressure) and low pressure (suction pressure).

  In the present embodiment, the upper part of the fixed scroll 2 is provided so as to cover (enclose) the outlet side of the discharge port 2b of the fixed scroll 2, and the discharge space of the discharge gas discharged from the discharge port 2b ( A disc-shaped discharge gas outflow member (swivel unit) 13 forming a discharge space 1a is attached by a fixing bolt 13c. The discharge gas outflow member 13 is also formed with a discharge gas passage 13a that guides the discharge gas discharged into the discharge space 1a to the outer peripheral side. Note that lubricating oil is also mixed in the discharge gas discharged into the discharge space 1a.

  Further, an annular discharge gas swirl region 1b is formed between the outer peripheral surface of the discharge gas outflow member 13 and the inner wall surface of the sealed container 1, and the fluid discharged from the discharge gas passage 13a The discharge gas swirl region 1b is swung, the lubricating oil is separated from the discharge gas, the lubricating oil is caused to flow into the lower oil return space 1c, and the discharge gas rises while swirling. A baffle plate 14 that guides the discharge gas rising from the discharge gas swirl region 1b toward the center side of the hermetic container 1 is provided above the discharge gas swirl region 1b.

  Next, the configuration of the discharge gas outflow member 13 and the baffle plate 14 will be described in detail with reference to FIGS. 2 is an enlarged cross-sectional view of the main part of FIG. 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB in FIG.

  2, the discharge gas swirl region 1b is formed between the outer peripheral surface of the discharge gas outflow member 13 and the inner wall surface of the hermetic container 1. The discharge gas swirl region 1b is shown in FIG. As shown in FIG. 3, it is formed in an annular space.

  On the other hand, the discharge gas outlet member 13 has a plurality of discharge gas passages 13a (three in this example) for guiding the fluid discharged into the discharge space 1a of the discharge gas to the outer peripheral side thereof as shown in FIG. ) Is formed. The discharge gas flow path 13a is configured in a curved shape such as an arc so that the fluid in the discharge space 1a is discharged into the discharge gas swirl region 1b and swirls. Reference numeral 13b denotes a suction pipe through-hole provided for passing through the suction pipe 12 and connecting it to the fixed scroll 2.

  As shown in FIGS. 2 and 4, the baffle plate 14 is disposed at the upper part of the discharge gas swirl region 1b, and discharge gas rising while swirling in the discharge gas swirl region 1b is centered on the hermetic container 1. The ring-shaped member 14a that leads to the side direction and the cylindrical member 14b on the outer peripheral side are integrated. In this embodiment, the baffle plate 14 is fixed to the sealed container 1 by fixing the portion of the cylindrical member 14b to the inner wall of the upper lid of the sealed container 1 by spot welding or the like.

  A gas compression operation in the hermetic scroll compressor of this embodiment will be described with reference to FIG. When the electric motor 7 is energized, the crankshaft 4 is rotated, and the eccentric part 4 a of the crankshaft 4 causes the center of the orbiting scroll 3 to revolve with a constant radius, and between the scroll laps of the fixed scroll 2 and the orbiting scroll 3. The working chamber formed in the chamber is reduced in volume to compress the working fluid. The working fluid (refrigerant) flowing through the refrigeration cycle flows into the working chamber through the suction pipe 12. The working fluid compressed in the working chamber flows out from the discharge port 2b provided at the center of the fixed scroll 2 into the sealed container 1 through the discharge gas discharge space 1a.

  Next, lubrication of the sliding portion of each bearing and the sliding portion of the scroll compression element 20 in the hermetic scroll compressor 30 of the present embodiment will be described. The lubricating oil stored in the oil sump 17 at the bottom of the sealed container 1 is sucked up by an oil supply pump 10 provided at the lower end of the shaft by the rotation of the crankshaft 4, and passes through the oil supply hole 4 b inside the crankshaft 4. The sub-bearing 8, the main bearing 5a, and the slewing bearing 3a are supplied to the bearing sliding portions. The lubricating oil supplied to the sub-bearing 8 at the bottom of the hermetic container 1 is collected in the oil reservoir 17 after the sub-bearing 8 is lubricated.

  The lubricating oil supplied to the main bearing 5a and the slewing bearing 3a lubricates each bearing sliding portion, and then merges in the oil return flow path 5b of the frame 5 and passes through the oil return pipe 11 to the bottom of the sealed container 1. It is collected in the oil sump 17.

  The sliding portion of the scroll compression element 20 is lubricated in the back pressure chamber 21 by an oil supply pocket (not shown) recessed in the lower end surface of the boss portion provided with the orbiting bearing 3a of the orbiting scroll 3. The oil is supplied in a fixed amount, whereby the lubricating oil is supplied to a sliding portion such as the Oldham ring 6 of the orbiting scroll 3 and lubrication is performed. The oil supplied to the back pressure chamber 21 flows into the working chamber through a back pressure control valve (not shown) that adjusts the pressure in the back pressure chamber 21, and is used for sealing and lubricating the working chamber. Then, it is discharged from the discharge port 2b together with the working fluid.

In order to secure the performance and reliability of the hermetic scroll compressor and to improve the performance, it is necessary to keep the ratio (oil rate) of the lubricating oil in the working fluid discharged from the compressor as low as possible. By configuring as in the present embodiment, the lubricating oil in the working fluid flowing out from the discharge port 2b can be effectively separated and quickly recovered in the oil reservoir 17 at the bottom of the sealed container 1. Hereinafter, the oil separation action in the present embodiment will be described with reference to FIGS.
A discharge gas outflow member (swivel unit) 13 disposed on the upper part of the fixed scroll 2 allows the discharge gas flowing out from the discharge port 2b to the discharge space 1a of the discharge gas through the discharge gas flow path 13a. The discharge gas is caused to flow into an annular discharge gas swirl region 1b defined between the outer periphery (including a part of the outer periphery of the fixed scroll 2) and the inner wall surface of the hermetic container 1 to impart a swirl motion to the discharge gas. .

  The discharge gas discharged from the discharge port 2b is in a gas-liquid two-phase spray flow in which lubricating oil is mixed in the working fluid, but the discharge gas flow of the discharge gas outflow member (swivel unit) 13 When passing through the passage 13a, the spray flow is given a swirl velocity component, and in the discharge gas swirl region 1b, a large oil droplet is pressed against the inner wall of the hermetic container 1 by centrifugal force to become a liquid film flow. The gas is separated from the low density gas flowing on the inner peripheral side of the discharge gas swirl region 1b.

  In order to reduce the oil rate of the compressor, there is no mixing of oil and gas separated in the discharge gas swirl region 1b, only gas flows out from the discharge gas swirl region 1b, and a discharge pipe 15 is provided. It must be led to the discharge pipe inlet space 1d.

  In the present embodiment, in order to prevent the separated oil from scattering, the discharge gas flow direction is guided toward the center side of the sealed container 1 in the form that does not prevent the swirl movement of the discharge gas above the discharge gas swirl region 1b. A baffle plate 14 is provided. That is, the baffle plate 14 fixed to the hermetic container 1 so as to cover the upper part of the discharge gas swirl region 1b apart from the discharge gas outflow member 13 is separated upward in the axial direction of the separated oil and gas by the ring-shaped member 14a. However, since the swirling motion of the discharge gas itself is not obstructed, the discharge gas is kept in the sealed container 1 from the opening on the inner end side of the ring-shaped member 13a in a state where the centrifugal separation is continued. It flows out toward the center and is guided to the discharge pipe inlet space 1d.

  Further, the lubricating oil separated in the discharge gas swirl region 1b and adhering to the inner wall surface of the sealed container 1 in a liquid film state is dropped into the oil return space 1c by the action of gravity, and from this oil return space 1c, the fixed scroll 2 and an oil return passage 1e formed in the axial direction on the outer periphery of the frame 5 and collected in an oil sump 17 at the bottom of the sealed container 1.

  As a result of experiments by the present inventors, in order to further improve the oil separation action in the present embodiment, appropriate arrangement of the baffle plate 14 that suppresses mixing of separated oil and gas and prevents oil droplets from being scattered. It is clear that the installation is important and plays an important role in reducing the oil rate (the oil circulation rate (OCR: Oil Circulation Rate), the proportion of lubricating oil in the working fluid discharged from the compressor) became. Hereinafter, the effective arrangement | positioning of the said baffle board 14 is demonstrated using FIGS.

  FIG. 5 is an enlarged cross-sectional view of the main part showing the vicinity of the discharge gas swirl region shown in FIG. 2 (a diagram for explaining the arrangement relationship between the discharge gas outflow member and the baffle plate), and FIG. FIG. 7 is a diagram showing experimental results of the relationship between the ratio of the width of the baffle plate to the width of the discharge gas swirl region and the oil circulation rate ratio in FIG. 7, and FIG. 7 shows the baffle plate with respect to the width of the discharge gas swirl region in Example 1 of the present invention. It is a diagram which shows the experimental result of the relationship between ratio of the opening height of an oil, and an oil circulation rate ratio.

  In FIG. 5, L is the width dimension of the discharge gas swirl region 1 b and is the dimension of the annular space between the outer periphery of the discharge gas outflow member 13 and the inner wall surface of the sealed container 1. Further, w is a width dimension (hereinafter also simply referred to as a width dimension of the baffle plate) in the ring-shaped member 14a portion of the baffle plate 14, and h is an opening height dimension of the baffle plate 14.

FIG. 6 shows the experimental results of examining the influence on the oil rate (OCR) by changing the width dimension w of the ring-shaped member 14a.
In FIG. 6, the horizontal axis represents the baffle plate width dimension ratio w / L, which is the ratio of the baffle plate width dimension w to the width dimension L of the discharge gas swirl region 1b. The vertical axis represents the oil circulation rate (OCR) ratio, which is expressed as a ratio to the smallest value of the oil circulation rate.

From the experimental results shown in FIG. 6, the ratio w / L of the baffle plate width dimension w to the width dimension L of the discharge gas swirl region 1b is
0.4 ≦ w / L ≦ 1.0
It was found that a high oil rate reduction effect can be obtained by setting to the above range.

FIG. 7 shows the experimental results of examining the influence on the oil rate (OCR) by changing the opening height dimension h of the baffle plate 14.
In FIG. 7, the horizontal axis is the opening height dimension ratio h / L, which is the ratio of the baffle plate opening height dimension h to the width dimension L of the discharge gas swirl region 1b. The vertical axis represents the oil circulation rate (OCR) ratio, which is expressed as a ratio with respect to the smallest value of the oil circulation rate, and is normalized and displayed in a dimensionless manner.

From the experimental results shown in FIG. 7, the ratio h / L of the opening height dimension h of the baffle plate to the width dimension L of the discharge gas swirl region 1b is
0.4 ≦ h / L ≦ 0.7
It was found that a high oil rate reduction effect can be obtained by setting to the above range.

  Next, a preferable shape of the discharge gas passage 13a in the discharge gas outflow member (swivel unit) 13 will be described with reference to FIG. FIG. 8 is a diagram for explaining the configuration of the discharge gas outflow member according to the first embodiment of the present invention, and is a plan sectional view of a portion of the discharge gas outflow member.

  Smooth discharge gas in the discharge gas swirl region 1b, which is an annular space defined between the outer peripheral portion of the discharge gas outflow member 13 (including a part of the outer peripheral portion of the fixed scroll 2) and the inner wall surface of the sealed container 1. In order to realize the turning motion, the shape of the discharge gas passage 13a formed in the discharge gas outflow member 13 is important. Therefore, a preferable shape of the discharge gas passage 13a in the first embodiment will be described with reference to FIG.

  First, a discharge gas outflow start point Pi is determined on the inner wall of the discharge gas discharge space 1a formed at the center of the discharge gas outflow member 13. From this point, the point where the straight line passing through the center of the sealed container 1 is in contact with the inner wall of the sealed container 1 is Po, and the discharge gas flow path 13a is formed by an arc (radius Ro, center Og) whose diameter is the line connecting them. One curve is drawn. The other curve is determined by an arc having a radius Ri (= Ro−b) having the same center as the radius Ro by determining the groove width b in consideration of the number of discharge gas passages 13a, the groove sectional area, and the like. By forming the discharge gas flow path 13a by such an arc, the discharge gas flowing out to the discharge gas swirl region 1b flows so as to be in contact with the inner wall surface of the hermetic container 1, thereby realizing a smooth swirl movement. Can do.

  FIG. 9 is a view showing another example of the discharge gas outflow member shown in FIG. 8, and corresponds to FIG.

  The discharge gas outflow member 13 shown in FIG. 9 is obtained by expanding the volume of the discharge gas discharge space 1a as much as possible while maintaining the basic shape of the discharge gas passage 13a as described in FIG. Therefore, the portion of the discharge gas outflow member 13 around the discharge gas discharge space 1a is formed as thin as possible. That is, the discharge space 1a is formed by leaving only the periphery of the bolt hole of the fixing bolt 13c that fixes the discharge gas outflow member 13 and the periphery of the suction pipe through hole 13b. The discharge gas passage 13a is formed on the outer peripheral side of the bolt hole.

  With this configuration, the volume of the discharge gas discharge space 1a, which is the first space in which the discharge gas flows out from the discharge port 2b, can be increased, so that the pressure pulsation in the discharge gas discharge space 1a can be increased. As a result, it is possible to reduce the over-compression loss of the compressor and improve the compressor efficiency.

  As described above, according to the hermetic scroll compressor 30 of the first embodiment, the oil rate is reduced with a relatively simple configuration, and the outside (the heat exchanger and the refrigerant pipe constituting the refrigeration cycle). Etc.), a hermetic scroll compressor can be obtained. As a result, it is possible to improve the performance and reliability of the compressor while suppressing an increase in the size of the hermetic scroll compressor.

  A second embodiment of the hermetic scroll compressor according to the present invention will be described with reference to FIGS. 10 is a longitudinal sectional view showing a second embodiment of the hermetic scroll compressor of the present invention, a view corresponding to FIG. 2, FIG. 11 is an enlarged view of a main part of FIG. 10, and FIG. 12 is a CC line of FIG. FIG. 13 is a perspective view of the baffle plate shown in FIG. In these drawings, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and the description will focus on the parts different from the first embodiment.

  As shown in FIGS. 10 and 11, the second embodiment is different from the first embodiment described above in that the baffle plate 14 and the discharge gas outflow member 13 through the spacer 14d and the end plate portion at the top of the fixed scroll 2 are used. The fixing bolt 13c is used for fixing. That is, as shown in the enlarged view of the main part of FIG. 11, the cylindrical member 14b of the baffle plate 14 is not directly fixed to the sealed container 1 as in the first embodiment, and the cylindrical member 14b and the sealed container are not fixed. A minute gap δ is formed between the inner wall surface of the upper lid 1. For this reason, compared with the baffle plate 14 described in the first embodiment, after the discharge gas outflow member 13 and the baffle plate 14 are attached to a fixed scroll and assembled, the upper lid of the sealed container 1 can be fixed by welding. Therefore, the assembly accuracy of the discharge gas outflow member 13 and the baffle plate 14 is improved, and variation in oil rate due to the assembly accuracy can be reduced.

  Further, as shown in FIGS. 12 and 13, the baffle plate 14 according to the second embodiment has a plurality of (four in this example) mounting arms 14c protruding from the inner end of the ring-shaped member 14a toward the center. An attachment hole 14c ′ is formed at the tip of each of the attachment arms 14c. The fixing bolt 13c is passed through the mounting hole 14c 'and the bolt hole provided in the discharge gas outflow member 13, and is fixed to the end plate portion of the fixed scroll 1, whereby the discharge gas outflow member 13 and the The baffle plate 14 can be fixed to the fixed scroll 2 at the same time. Other configurations are the same as those of the first embodiment.

  According to the second embodiment, the mounting arm 14c protrudes from the inner end of the ring-shaped member 14a toward the center and is fixed by the fixing bolt 13c. The swirling motion of the discharge gas swirling in the discharge gas swirling region 1b formed between the inner wall surface of the container 1 is not disturbed. Accordingly, since the discharge gas can be guided to the discharge pipe inlet space 1d while continuing the centrifugal separation and separating the lubricating oil, the mixing of the separation oil and the gas can be suppressed as in the first embodiment. As a result, oil droplets can be prevented from scattering and the oil rate of the compressor can be reduced.

  A third embodiment of the present invention will be described with reference to FIG. FIG. 14 is a refrigeration cycle configuration diagram showing a refrigeration air-conditioning apparatus provided with the hermetic scroll compressor of the present invention. In FIG. 14, the parts denoted by the same reference numerals as those in FIG. 1 described above indicate the same or corresponding parts.

  14, 30 is a hermetic scroll compressor of the present invention as shown in FIG. Further, the refrigerating and air-conditioning apparatus shown in the third embodiment is configured such that the hermetic scroll compressor 30, the condenser 32, the expansion valve 33, the evaporator 34, and the like are sequentially connected by the refrigerant pipe 35 to constitute a refrigeration cycle. Yes. In Example 3, R32 is used as the refrigerant. Refrigerant R32 has a smaller global warming potential (GWP) than refrigerant R410A conventionally used in refrigerating and air-conditioning apparatuses, and has been attracting attention in recent years from the viewpoint of preventing global warming.

The flow of the refrigerant in the refrigerating and air-conditioning apparatus of the present embodiment will be described.
The high-temperature and high-pressure refrigerant discharged from the hermetic scroll compressor 30 enters the condenser 32 and dissipates heat to lower the temperature. The refrigerant discharged from the condenser 32 flows out as a low-temperature, low-pressure gas-liquid two-phase refrigerant at the expansion valve 33. The gas-liquid two-phase refrigerant exiting the expansion valve 33 enters the evaporator 34, absorbs heat and gasifies, returns to the hermetic scroll compressor 30, is compressed again, and the same cycle is repeated thereafter.

  Thus, if the refrigeration air-conditioning apparatus is a refrigeration apparatus, the evaporator 34 cools the object to be cooled. If the refrigerating and air-conditioning apparatus is an air-conditioning apparatus, the evaporator 34 cools the room air and performs a cooling operation, or the condenser 32 heats the room air and performs a heating operation.

  According to the third embodiment, as the compressor constituting the refrigeration air conditioner, the hermetic scroll compressor 30 of the present invention, that is, the hermetic scroll compressor as described in the first and second embodiments is used. Therefore, it is possible to sufficiently prevent oil from flowing out from the compressor 30 to the outside (heat exchanger such as the condenser 32 and evaporator 34 constituting the refrigeration cycle or the refrigerant pipe). . Therefore, it is possible to improve the performance and reliability of the refrigeration air conditioner.

  According to the embodiment of the present invention described above, the fixed scroll is provided so as to cover the outlet side of the discharge port in the fixed scroll, and the discharge space for the discharge gas discharged from the discharge port is formed. A disc-shaped discharge gas outflow member forming a discharge gas flow path for guiding the discharge gas discharged into the space to the outer peripheral side, and between the outer peripheral surface of the discharge gas outflow member and the inner wall surface of the sealed container An annular discharge gas swirl region is formed, and the discharge gas flow path causes the discharge gas to flow out in a swirl motion in the discharge gas swirl region, and the discharge gas swirl region is disposed above the discharge gas swirl region. The baffle plate that guides the discharged gas toward the center of the sealed container is provided, so the sealed scroll compression can improve the oil spill prevention effect outside the compressor while suppressing the increase in size And it is possible to obtain a refrigerating and air-conditioning apparatus.

  Further, the baffle plate guides the discharge gas to the upper part without blocking its swirl movement and guides it to the center of the closed container. At the bottom of the discharge gas swirl area, an oil return space and an oil return space are provided. Since it has an oil return passage that guides the lubricating oil to the bottom of the sealed container, it can effectively separate the gas and oil by centrifugal action due to the swirling motion of the discharge gas itself, and suppresses mixing of the separated oil and gas. Can reduce the scattering of oil droplets. Therefore, according to the present embodiment, it is possible to obtain a high-pressure type hermetic scroll compressor that prevents oil from flowing out of the compressor and is excellent in performance and reliability, and performance of a refrigeration air conditioner using the same. In addition, reliability can be improved.

In addition, this invention is not limited to the Example mentioned above, Various modifications are included. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
Further, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

DESCRIPTION OF SYMBOLS 1 ... Airtight container, 1a ... Discharge space (discharge space) of discharge gas, 1b ... Discharge gas rotation area | region,
1c ... oil return space, 1d ... discharge pipe inlet space, 1e ... oil return passage,
2 ... fixed scroll, 2a ... suction port, 2b ... discharge port,
3 ... Orbiting scroll, 3a ... Orbiting bearing, 4 ... Crankshaft, 4a ... Eccentric part, 4b ... Refueling hole,
5 ... Frame, 5a ... Main bearing, 5b ... Oil return channel,
6 ... Oldham ring, 7 ... Electric motor, 7a ... Stator, 7b ... Rotor,
8 ... sub bearing, 9 ... sub bearing frame,
10 ... Oil pump, 11 ... Oil return pipe, 12 ... Suction pipe,
13 ... Discharge gas outflow member (swivel unit), 13a ... Discharge gas flow path,
13b: suction pipe through hole, 13c: fixing bolt,
14 ... baffle plate, 14a ... ring-shaped member, 14b ... cylindrical member,
14c ... Mounting arm, 14c '... Mounting hole, 14d ... Spacer,
15 ... discharge pipe, 16 ... back pressure sealing mechanism, 17 ... oil sump, 18 ... bolt,
20 ... Scroll compression element, 21 ... Back pressure chamber,
30 ... Hermetic scroll compressor, 31 ... Refrigeration cycle, 32 ... Condenser,
33 ... expansion valve, 34 ... evaporator, 35 ... refrigerant piping.

Claims (11)

A scroll compression element including a fixed scroll and a turning scroll; an electric motor that drives the scroll compression element; a sealed container that houses the scroll compression element and the electric motor; and a suction port and a discharge port formed in the fixed scroll; A hermetic scroll compressor comprising a suction pipe connected to the suction port and a discharge pipe that is fixed to the hermetic container and guides discharge gas flowing out from the discharge port of the fixed scroll to the outside of the compressor;
The fixed scroll is provided on the fixed scroll so as to cover the outlet side of the discharge port, and forms a discharge space for the discharge gas discharged from the discharge port, and discharge gas discharged into the discharge space on the outer peripheral side. A discharge gas outflow member forming a discharge gas flow path leading to
An annular discharge gas swirl region is formed between the outer peripheral surface of the discharge gas outflow member and the inner wall surface of the sealed container, and the discharge gas flow path of the discharge gas outflow member is discharged into the discharge gas swirl region. A shape that allows the gas to flow out to swirl,
A hermetic scroll compressor, wherein a baffle plate for guiding the discharge gas in the discharge gas swirl region toward the center side of the hermetic container is provided above the discharge gas swirl region.   2. The hermetic scroll compressor according to claim 1, wherein an oil sump for holding lubricating oil is provided at a bottom portion of the hermetic container, and an oil return space is provided at an outer peripheral portion of the fixed scroll at a lower portion of the discharge gas swirl region. A hermetic scroll compressor, characterized in that an oil return passage is formed in the lower part of the oil return space, and an oil return passage for guiding lubricating oil to the oil reservoir side of the bottom of the sealed container is provided.   2. The hermetic scroll compressor according to claim 1, wherein the baffle plate is formed in a ring shape, and the discharge gas in the discharge gas swirl region is directed from an outer end side of the baffle plate toward a center side of the sealed container. The hermetic scroll compressor is configured to flow out.   4. The hermetic scroll compressor according to claim 3, wherein the baffle plate includes a ring-shaped member that guides a discharge gas that rises in the discharge gas swirl region toward a center side of the sealed container, and an outer peripheral side of the ring-shaped member. A hermetic scroll compressor characterized in that a cylindrical member provided in the unit is integrated.   The hermetic scroll compressor according to claim 4, wherein the baffle plate is fixed by fixing the cylindrical member to the hermetic container.   The hermetic scroll compressor according to claim 4, wherein the baffle plate is fixed by fixing the ring-shaped member to the fixed scroll. In the hermetic scroll compressor according to claim 3, when the width dimension in the radial direction of the baffle plate is w and the width dimension of the discharge gas swirl region is L,
0.4 ≦ w / L ≦ 1.0
A hermetic scroll compressor characterized by being configured as follows. The hermetic scroll compressor according to any one of claims 3 to 7, wherein an opening height dimension between an inner end side of the baffle plate and the discharge gas outflow member is h, and the discharge gas swirl region. When the width dimension of L is L,
0.4 ≦ h / L ≦ 0.7
A hermetic scroll compressor characterized by being configured as follows.   The hermetic scroll compressor according to claim 1, wherein a discharge gas outflow start point is defined on an inner wall of the discharge space of the discharge gas outflow member, and a straight line passing from this point through the center of the hermetic container is defined. An arc Ro having a diameter connecting to a point in contact with the inner wall of the hermetic container is a curve that forms the discharge gas flow path, and the other curve that forms the discharge gas flow path is the one curve The radius is smaller by the groove width than the arc Ro of the curve, and the arc is determined by the arc Ri having the same center as the arc Ro, and the discharge gas passage is formed by the arcs Ro and Ri. A hermetic scroll compressor.   2. The hermetic scroll compressor according to claim 1, wherein the discharge space of the discharge gas outflow member includes only a periphery of a bolt hole of a fixing bolt that fixes the discharge gas outflow member and a periphery of a suction pipe through hole. The sealed scroll compressor is characterized in that the discharge space is formed by enlarging the volume of the discharge space as much as possible, and the discharge gas passage is formed on the outer peripheral side of the bolt hole.   In the refrigerating and air-conditioning apparatus which comprises a refrigerating cycle by connecting a compressor, a condenser, an expansion device, and an evaporator with refrigerant piping, R32 is used as a refrigerant of the refrigerating cycle, and the compressor is described in claim 1. A refrigeration air conditioner using a hermetic scroll compressor.

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