JP2015124700A - Hermetic type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hermetic type compressor enabled, even if a high pressure refrigerant is used, to design and mount an airtight terminal or an attachment to be disposed around the terminal, while retaining the strength of an upper container.SOLUTION: The cover part 2a of an upper container 2 of a closed vessel 3 is formed as a whole into a round cover shape by combining a plurality of spherical surfaces 31 having a circular arc center on the inner side of a closed vessel, spherical surfaces 32 having a circular arc center on the outer side of the closed vessel, or a combination between the spherical surface 31 having a circular arc center on the inner side of the closed vessel and the spherical surface 32 having a circular arc center on the outer side of the closed vessel.

Description

  The present invention relates to a hermetic compressor used in a cooling device such as an air conditioner, and more particularly to a hermetic compressor that improves the pressure resistance of a hermetic container constituting an outer shell.

  Currently, various alternative refrigerants that have little impact on global warming are being studied. These have excellent refrigerant characteristics, but there are refrigerants (hereinafter referred to as high-pressure refrigerants) whose saturation pressure is higher than that of the existing R22 refrigerant. Therefore, a hermetically sealed container having such a high-pressure refrigerant as a conventional sealed container, that is, a bottomed cylindrical lower container and a flat upper container fitted and fixed to the lower container. When it is used in a mold compressor and a pressure test is performed, the upper container is deformed, and an excessive force is applied to the hermetic terminal attached to the upper container, resulting in damage.

  Therefore, in order to provide a sealed container having a pressure resistance that can use a high-pressure refrigerant, there has been proposed one in which the upper container has a spherical shape to increase the pressure resistance and prevent damage to the airtight terminal attached to the upper container. (For example, refer to Patent Document 1).

  In addition, there has been proposed a device in which an airtight terminal is arranged in the center of a spherical upper container so as to reduce stress concentration on the airtight terminal (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 10-159777 (summary, FIG. 1) JP 11-190277 A (summary, FIG. 1)

  However, in the technique of Patent Document 1 in which the upper container is simply spherical, the strength may not be sufficiently maintained unless the plane area for installing the airtight terminal and peripheral accessories is appropriate.

  Further, in the technique of Patent Document 2 in which the hermetic terminal is arranged at the center of the spherical upper container so as to reduce the stress concentration on the hermetic terminal, the compressor body (sealed container) depends on the position and the mounting angle of the hermetic terminal. ) May be difficult to design the piping through which the refrigerant is discharged, and it may be difficult to design and install a cover that covers the airtight terminal.

  The present invention was made in order to solve the above-described problems. Even when a high-pressure refrigerant is used, the design and attachment of an airtight terminal and accessories installed around the airtight terminal are ensured while ensuring the strength of the upper container. The purpose is to make it easy.

  A hermetic compressor according to the present invention includes a compression mechanism part and an electric motor part that drives the compression mechanism part inside a hermetic container, and is equipped with a discharge pipe and a suction pipe for circulating the refrigerant in the refrigerant circuit. In the compressor, the sealed container includes a bottomed cylindrical lower container and a covered cylindrical upper container that is fitted and fixed to the bottom container, and the upper container has a lid that is sealed at the center of the arc. A combination of a plurality of spherical surfaces inside the container, a plurality of spherical surfaces whose arc center is outside the sealed container, or a spherical surface whose arc center is inside the sealed container and a spherical surface whose arc center is outside the sealed container As a whole, it is formed in a circular lid shape.

  According to the hermetic compressor of the present invention, the upper container of the hermetic container has a plurality of spherical surfaces whose lids are inside the hermetic container and whose spherical parts are outside the hermetic container. Or the overall shape of the circular arc is a combination of a spherical surface with the center of the arc inside the sealed container and a spherical surface with the center of the arc outside the sealed container. The strength of the lid can be ensured. This facilitates the design and attachment of the hermetic terminal and accessories installed around it.

1 is a longitudinal sectional view showing an overall configuration of a hermetic compressor according to an embodiment of the present invention. It is sectional drawing of the side view which shows the upper side container of the airtight container of the airtight compressor which concerns on embodiment of this invention. It is sectional drawing of the upper surface view which shows the upper side container of the airtight container of the airtight compressor which concerns on embodiment of this invention. The test results of the deformation amount of the upper container of the hermetic container and the stress near the airtight terminal of the hermetic compressor according to the embodiment of the present invention are the deformation amount of the upper container of the flat shape (comparative example) and the stress near the hermetic terminal. It is a characteristic view shown in comparison.

The present invention will be described below with reference to illustrated embodiments.
FIG. 1 is a longitudinal sectional view showing the overall configuration of a hermetic compressor, that is, a single-cylinder rotary compressor according to an embodiment of the present invention.

The rotary compressor 100 of this embodiment is equipped with the airtight container 3 which has the bottomed cylindrical lower container 1 and the lidded cylindrical upper container 2 fitted and fixed to this as shown in FIG. . And inside the airtight container 3, the compression mechanism part 4, the electric motor part 5 which drives the compression mechanism part 4, and the lubricating oil and refrigerant | coolant which are not shown in figure are accommodated. A suction pipe 7 communicating with the suction muffler 6 is connected to the lower container 1, and refrigerant gas is taken from the suction muffler 6 through the suction pipe 7. The high-pressure refrigerant can be used, i.e. the saturated pressure is higher than the existing R22 refrigerant refrigerant, eg R32, R410A, is CO _2. The suction muffler 6 has functions of gas-liquid separation of the refrigerant and removing dust in the refrigerant. The upper container 2 has an airtight terminal 8 for supplying electric power to the electric motor unit 5 from the outside, a discharge pipe 9 for discharging the compressed refrigerant to the outside of the hermetic container 3, and a cover for protecting the airtight terminal 8 (FIG. (Not shown) and a rod 11 for fixing. Here, a compatible oil (an oil that dissolves in a refrigerant) is used as the lubricating oil.

  The electric motor unit 5 includes a stator 12 fixed to the lower container 1 and a rotor 14 shrink fitted on the crankshaft 13, and is driven by power supplied from the outside via the airtight terminal 8. The The electric motor unit 5 and the compression mechanism unit 4 are connected by a crankshaft 13. An oil suction hole that opens in the bottom direction of the sealed container 3 is formed in the axial center of the crankshaft, and a spiral centrifugal pump is provided in the oil suction hole, and is stored in the bottom of the sealed container 3. The lubricating oil is pumped up and can be supplied to the sliding part.

  The compression mechanism portion 4 includes an upper bearing 15, a lower bearing 16, a cylinder 17, an eccentric portion 13 a of the crankshaft 13 accommodated in the cylinder 17, a roller 18, and a vane 19.

  A crankshaft 13 is inserted into the cylinder 17, and an eccentric portion 13 a is arranged in the cylinder 17. The cylinder 17 is formed with a suction port and a discharge port, and the suction port communicates with the suction pipe 7. In addition, a discharge valve that opens when the pressure exceeds a predetermined pressure is provided on the downstream side of the discharge port.

  A roller 18 is fitted in the eccentric portion 13 a so that the roller 18 can perform an eccentric rotational movement in the cylinder 17. A vane 19 is slidably inserted into the cylinder 17. The vanes 19 are always pressed against the rollers 18 by urging means (not shown), and have a function of partitioning the space formed between the cylinder 17 and the rollers 18 into a compression chamber and a suction chamber. Further, an upper bearing 15 and a lower bearing 16 that close both end surfaces of the cylinder 17 and support the crankshaft 13 are disposed at both upper and lower ends of the cylinder 17. The cylinder 17, the upper bearing 15, and the lower bearing 16 Are fastened together by bolts (not shown).

  In the rotary compressor 100 according to the embodiment of the present invention configured as described above, the roller 18 rotates and slides inside the cylinder 17 as the rotor 14 rotates. Thereby, the refrigerant gas is sucked from the suction pipe 7 into the compression chamber, and the refrigerant sucked into the compression chamber is compressed. The compressed high-pressure refrigerant gas is discharged into the sealed container 3 and discharged into the upper space in the sealed container 3 together with the compatible oil from the gap between the stator 12 and the rotor 14. The high-pressure refrigerant gas discharged together with the compatible oil into the upper space in the sealed container 3 collides with the inner surface of the circular lid-like lid portion 2a of the upper container 2, and at this time, the compatibility is caused by the density difference between the compatible oil and the refrigerant. Oil is separated from the refrigerant. The compatibilized oil separated from the refrigerant flows in the outer circumferential direction of the stator 12 along the inner surface of the lid-shaped lid portion 2a, flows downward from the gap between the lower container 1 and the stator 12, and is sealed. Returned to the bottom of the container 3 and stored. The high-pressure refrigerant gas separated from the compatible oil is discharged from the discharge pipe 9 to the outside of the sealed container 3.

  As described above, in the rotary compressor 100 according to the embodiment of the present invention, the lid portion 2a of the upper container 2 of the sealed container 3 is formed in a circular lid shape as a whole. This will be described in more detail with reference to FIGS.

FIG. 2 is a side sectional view showing an upper container of a hermetic compressor, that is, a hermetic container of a rotary compressor according to an embodiment of the present invention. FIG. 3 is a cross-sectional view in a top view showing the upper container of the hermetic compressor according to the embodiment of the present invention, that is, the hermetic container of the rotary compressor.
In the rotary compressor 100 of the present embodiment, as shown in FIG. 2, the lid portion 2 a of the upper container 2 of the sealed container 3 is a spherical surface 31 with the center of the arc inside the sealed container 3, and the center of the arc is the sealed container 3. As a whole, it is formed in a circular lid shape by a combination with the spherical surface 32 on the outside. That is, the lid portion 2a of the upper container 2 has a plurality of types of spherical surfaces 31 and 32 acting as ribs.

  Thus, the lid portion 2a of the upper container 2 is formed into a circular lid shape by combining a plurality of types of spherical surfaces 31 and 32 acting as ribs, so that the lid portion of the upper container is flat or simply The rigidity of the upper container can be increased as compared with the spherical shape.

  Here, the radius R1, R2 of the spherical surface having the largest surface area among the spherical surfaces 31, 32 of the upper container 2 is 0.4 to 1.2 times the inner diameter D of the cylindrical portion of the lower container 1 (preferably (0.6 times). The reason why the lower limit of the radius R1, R2 of the spherical surface having the largest surface area is 0.4 times the inner diameter D of the cylindrical portion of the lower container 1 is that if the radius R1, R2 is smaller than that, the airtight terminal 8 This is because it becomes difficult to install. The upper limit of the radius R1, R2 of the spherical surface having the largest surface area is set to 1.2 times the inner diameter D of the cylindrical portion of the lower container 1 when the radius R1, R2 is larger than that. This is because the surface is close to, and the shape of the spherical surface cannot be maintained, and rigidity cannot be obtained. By setting the radiuses R1 and R2 of the spherical surface having the largest surface area to 0.4 to 1.2 times the inner diameter D of the cylindrical portion of the lower container 1, workability and rigidity can be easily obtained.

  Moreover, the rotary compressor 100 of this embodiment is a vertical installation type, and as shown in FIG.2 and FIG.3, the several flat part 33 which can install the airtight terminal 8 in the cover part 2a of the upper container 2 is one place. It is provided in the above (here two places). These flat portions 33 are configured such that the inclination angle θ1 with respect to the horizontal plane is set in a range of 0 to 30 °, and the inclination direction and the angle coincide with each other in a side view. The reason why the inclination angle θ1 of the flat surface portion 33 with respect to the horizontal plane is set in the range of 0 to 30 ° is that the flat surface portion 33 can be made to follow the circular lid shape of the lid portion 2a of the upper container 2 by setting this angle range. This is because it is easy to ensure the strength. If the inclination angle θ1 of the flat surface portion 33 with respect to the horizontal plane is set to a negative angle or an angle larger than 30 °, the flat surface portion 33 cannot follow the shape of the circular lid of the lid portion 2a of the upper container 2, and this circular lid Since it deviates from the shape, it is difficult to ensure strength.

Further, the total area of these flat portions 33 is limited to be 0.1 to 0.4 times the cross-sectional area of the inner diameter D of the cylindrical portion of the lower container 1. The reason why the total area of the flat portion 33 is 0.1 to 0.4 times the cross-sectional area of the inner diameter D of the cylindrical portion of the lower container 1 is that the total area of the flat portion 33 is set to the above ratio. This is because the flat surface portion 33 can be made to follow the circular lid shape of the lid portion 2a of the upper container 2 and it is easy to ensure the strength. When the total area of the flat portion 33 is larger than 0.4 times the cross-sectional area of the inner diameter D of the cylindrical portion of the lower container 1, the flat portion 33 is made to follow the circular lid shape of the lid portion 2 a of the upper container 2. It becomes difficult to secure the strength because it becomes out of this circular lid shape.
And the airtight terminal 8 is attached to one of the plane parts 33, and the rod 11 which fixes the cover which protects the airtight terminal 8 to the other one of the plane parts 33 is attached by welding. The rod 11 is set so that the mounting angle θ2 with respect to the flat surface portion 33 is 80 to 100 ° (preferably 90 °). By setting the mounting angle to 80 to 100 °, workability can be ensured. If the attachment angle θ2 of the rod 11 with respect to the flat surface portion 33 is an angle smaller than 80 ° or an angle larger than 100 °, welding becomes difficult.

  In this way, the airtight terminal 8 and the rod 11 are attached to the flat surface portion 33 in which the inclination angle θ1 with respect to the horizontal plane is set in the range of 0 to 30 ° and the inclination direction and the angle coincide with each other in a side view. Therefore, the workability is good, the terminal cover shape can be simplified, and the mounting workability is also good.

  In addition, since the total area of each plane portion 33 is limited to 0.1 to 0.4 times the cross-sectional area of the inner diameter D of the cylindrical portion of the lower container 1, deformation around the airtight terminal 8, Stress can be relieved.

  Further, since the attachment angle θ2 of the rod 11 to the flat portion 33 is set in the range of 80 to 100 °, the fixing strength is easily obtained.

  Moreover, the rotary compressor 100 of this embodiment uses compatible oil as lubricating oil. The compatible oil has good solubility in the refrigerant, is easily dissolved in the refrigerant, and has high fluidity. Therefore, the oil taken out from the compressor easily returns to the compressor, and the amount of the compatible oil discharged from the compressor remains in the refrigerant circuit (= the compatible oil flows out of the compressor into the refrigerant circuit). Amount) can be reduced, and the refrigerant circuit design is facilitated.

FIG. 4 shows the amount of deformation of the upper container of the hermetic compressor according to the embodiment of the present invention, that is, the rotary container, and the stress test result in the vicinity of the hermetic terminal, and the amount of deformation of the flat upper container (comparative example). It is a characteristic view shown in comparison with the stress near the airtight terminal.
This test result shows that the upper container 2 of the present invention and the upper container 20 of the comparative example have the same plate thickness, the spherical radius is 0.7 times the inner diameter D of the cylindrical portion of the lower container 1, and the area of the plane portion is This is a result obtained by setting 0.25 times the cross-sectional area of the inner diameter D of the cylindrical portion of the lower container 1 and setting the inclination angle of the flat portion with respect to the horizontal plane to 10 °.

  As is apparent from FIG. 4, even when the plate thickness of the upper container is the same, the upper container 2 of the example shows that both the deformation amount and the stress are reduced as compared with the upper container 20 of the comparative example.

  In the above-described embodiment, the spherical surface that acts as the rib of the lid portion 2a of the upper container 2 has been described as an example in which the spherical surface is composed of a plurality of types of spherical surfaces 31 and 32. 31 or a plurality of spherical surfaces 32 may be combined, and even in this case, the same operation and effect as in the above-described embodiment can be obtained.

  In the above-described embodiment, the single-cylinder rotary compressor has been described as an example of the hermetic compressor to which the present invention is applied. However, the present invention can be applied to a multi-cylinder rotary compressor or a scroll compressor. It can be applied as it is.

  In the above-described embodiment, the discharge pipe 9 and the airtight terminal 8 are attached to the upper container 2 of the sealed container 3. However, the discharge pipe 9 and the airtight terminal 8 are provided on the lower container 1 of the sealed container 3. It may be attached to the cylindrical portion.

  DESCRIPTION OF SYMBOLS 1 Lower container, 2 Upper container, 2a Cover part, 3 Sealed container, 4 Compression mechanism part, 5 Electric motor part, 6 Suction muffler, 7 Suction pipe, 8 Airtight terminal, 9 Discharge pipe, 11 Rod, 12 Stator, 13 Crankshaft, 13a Eccentric part, 14 Rotor, 15 Upper bearing, 16 Lower bearing, 17 Cylinder, 18 Roller, 19 Vane, 20 Upper container of comparative example, 31 Spherical surface with arc center inside sealed container, 32 arc Spherical surface centered outside the sealed container, 33 plane part, 100 rotary compressor (sealed compressor), D inner diameter of the cylindrical part of the lower container, R1, R2 radius of the spherical surface with the largest surface area, θ1 plane The inclination angle of the part with respect to the horizontal plane and the mounting angle of the θ2 rod with respect to the flat part.

Claims (7)

In a hermetic compressor having a compression mechanism part and an electric motor part that drives the compression mechanism part inside the hermetic container, and having a discharge pipe and a suction pipe for circulating the refrigerant in the refrigerant circuit,
The sealed container includes a bottomed cylindrical lower container, and a covered cylindrical upper container that is fitted and fixed thereto,
The upper container has a plurality of spherical surfaces in which the center of the arc is inside the sealed container, a plurality of spherical surfaces in which the center of the arc is outside the sealed container, or the center of the arc is inside the sealed container. The hermetic compressor is characterized in that it is formed in a circular lid shape as a whole by combining the spherical surface in the above and the center of the circular arc with the spherical surface outside the hermetic container.   The radius of the spherical surface having the largest surface area among the spherical surfaces of the upper container is configured to be 0.4 to 1.2 times the inner diameter of the cylindrical portion of the lower container. Item 2. The hermetic compressor according to Item 1.   The upper container of the hermetic container has an airtight terminal which is a power supply part to the electric motor part, and is provided with one or more plane parts where the airtight terminal can be installed. The hermetic compressor according to claim 1 or 2, wherein an inclination angle with respect to a horizontal plane is 0 to 30 °.   A plurality of the flat portions are provided, and these flat portions have the same inclination direction and the same inclination angle with respect to the horizontal plane in a side view, and the total area of these flat portions is the inner diameter breakage of the cylindrical portion of the lower container. The hermetic compressor according to claim 3, wherein the hermetic compressor is configured to be 0.1 to 0.4 times the area.   A rod for fixing a cover protecting the hermetic terminal is provided, and the rod is provided at one of the flat portions so that an angle with respect to the flat portion is 80 to 100 °. Item 5. The hermetic compressor according to item 4.   The hermetic compressor according to any one of claims 1 to 5, wherein a refrigerant having a saturation pressure higher than that of the R22 refrigerant is used.   The hermetic compressor according to any one of claims 1 to 6, wherein a compatible oil is used as the lubricating oil.

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