CZ2014781A3 - Sealed compressor - Google Patents

Abstract

The lid portion (2a) of the upper container portion (2) of the sealed container (3) has a dome shape formed as a whole by a plurality of spherical surfaces (31) whose centers of arcs are located on the inside of the sealed container, a plurality of spherical surfaces (32) whose centers of arcs are located on the outside of the sealed container, or a combination of a spherical surface (31) whose center of arc is located on the inside of the sealed container, and a spherical surface (32) whose center of arc is located on the outside of the sealed container.

Description

Sealed compressor

Technical field

The invention relates to a sealed compressor for use in a refrigeration heater, such as an air conditioner.

In particular, the invention relates to a sealed compressor in which the pressure resistance is increased in the case of a sealed container which forms the outer shell.

Background of the Invention

Different types alternative refrigerant, which too much do not affect it global warming, they are in current time studied.

Although this cooling ma j í good cooling characteristics, so include í cooling, which ma j í pressure saturation higher, than when acquaintance cooling R22 (further

called high pressure refrigerant).

Thus, when the pressure test is performed in a state in which such a high-pressure refrigerant is used in a sealed compressor that includes a sealed vessel according to conventional specifications, i.e. a sealed vessel formed by a cylindrical bottom with a bottom and a flat top attached to the lower part of the container, the upper part of the container is deformed, and the airtight end piece attached to the upper part of the container is broken by the action of excessive force.

[0003]

Therefore, to create a sealed container having sufficient pressure-resisting strength and intended to use a high-pressure refrigerant, various techniques have been proposed to prevent damage or breakage of an airtight fitting attached to the top of the container by forming the top of the container in a spherical shape to increase strength. in resisting the action of pressure (see, for example, Patent Literature 1).

[0004]

In addition, techniques have been proposed to reduce the stress concentration of an airtight tip by placing the airtight tip in the center of the spherical top of the container (see, for example, Patent Literature 2).

-3Link list

Patent literature [Patent literature 1]

Japanese Published Patent Application No. 10-159 777 (annotation, Fig. 1) [Patent Literature 1]

Japanese Published Patent Application No. 11-190 277 (annotation, Fig. 1)

The essence of the invention

Technical Problem [0006]

However, in the case of the solution according to Patent Literature 1, in which the upper part of the container is simply formed in a spherical shape, sufficient strength can sometimes not be maintained if the planar surface on which the airtight terminal and other accessories are arranged does not have a sufficient area.

. 4 [0007]

In the case of the solution according to patent literature 2, in which the airtight end is located in the middle of the spherical upper part of the vessel to reduce the stress concentration in the airtight end area, difficult refrigerant can be forced out of the compressor body as well as arrange and attach the cap depending on position and angle. the pipe it is (sealed containers), for the airtight end fitting the airtight end piece.

[0008]

The present invention has been made to the above problems, and in order to solve the above-mentioned invention, it is very easy to arrange the terminal and the surrounding and attach the airtight accessory while ensuring the strength of the upper part of the container even when high pressure refrigerant is used.

Problem Solving [0009]

The sealed compressor according to the invention comprises a section of the compression mechanism and a section of the engine arranged in a sealed vessel, the section of the engine driving the section of the compression mechanism, and a discharge pipe and a suction pipe through which the refrigerant circulates in the refrigeration circuit.

The sealed container comprises a lower part of the container, shaped like a cylinder with a bottom, and an upper part of the container, shaped like a cylinder with a lid and firmly attached to the lower part of the container.

The wolf portion of the top of the container has a domed shape formed generally by a plurality of spherical surfaces whose arc centers are located on the inside of the sealed container, a plurality of spherical surfaces whose arc centers are located on the outside of the sealed container, or a combination of spherical surfaces whose arc center is located on the inside of the sealed container, and a spherical surface whose arc center is located on the outside of the sealed container.

Advantageous effects of the invention

Based on the sealed compressor of the present invention, the lid portion of the container top of the sealed container has a domed shape formed generally by a plurality of spherical surfaces whose arc centers are located on the inside of the sealed container by a plurality of spherical surfaces whose arc centers are located on the outside of the sealed container , or a combination of a spherical surface, the center of the arc of which is located on the inside of the sealed container, and a spherical surface, the center of the arc of which is located on the outside of the sealed container.

Therefore, the strength of the domed lid portion of the upper portion of the container can be ensured.

-6For these reasons, the terminal and the remaining airtight accessories can also be easily attached.

BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1]

Giant. 1 is a vertical overall view of a sealed sectional compressor in accordance with an embodiment of the present invention.

[Giant. 2]

Giant. 2 shows a cross-sectional side view of the upper portion of a sealed container vessel in a sealed compressor according to an embodiment of the present invention.

[Giant. 3]

Giant. 3 shows a top sectional view of the upper portion of a sealed container vessel in a sealed compressor according to an embodiment of the present invention.

[Giant. 4]

Giant.

shows a compared characteristic view, the results of tests of the amount of deformation of the upper part of the container in a sealed container and the stress in the vicinity of the airtight where they are

-7 terminals in a sealed compressor according to an embodiment of the present invention, with the amount of deformation of the flat upper part of the vessel (comparative example) and the stress near the airtight terminal.

Exemplary Embodiments of the Invention [0012]

The present invention will be further described based on the illustrated embodiment.

Giant. 1 is a vertical sectional view showing the overall arrangement of a sealed compressor according to an embodiment of the present invention, i.e., a single-cylinder rotary compressor.

[0013]

As shown in Fig. 1, the rotary compressor 100 according to this embodiment comprises a sealed container 3 having a container bottom portion 1 having a cylindrical bottom shape and a container top portion 2 which is fixedly mounted in the container bottom portion 1, and which has the shape of a cylinder with a lid.

The sealed container 3 houses a section 4 of the compression mechanism, a section 5 of the motor for driving the section 4 of the compression mechanism, as well as lubricating oil and coolant, which are not shown.

The suction pipe, which is connected to the suction damper 6, is connected to the lower part 7 of the container, so that cooling gas is sucked from the suction damper 6 via the suction pipe 7.

As a usable high-pressure refrigerant, that is, a refrigerant

having pressure saturation higher, than is the pressure becoming iciho chiadiva R22, for example refrigerant R32, R410A or CO2 is used. Shock absorber 6 sled has a function at gas separation and liquids

in the refrigerant and when removing dust from the refrigerant.

The upper part 2 of the container comprises an airtight end 8, by means of which energy is supplied from the outside to the engine section 5, a discharge pipe 9 through which compressed refrigerant is forced to the outside of the sealed container 3, and a rod 11 for fixing the lid (not shown) to protect the airtight terminal 8_.

In this case, a compatible oil (coolant soluble oil) is used as a lubricating oil.

[0014]

The engine section 5 comprises a stator 12, fixed to the lower part 1 of the container, and a rotor 14, mounted on the crankshaft 13 by means of a hot-fit bearing, being driven by energy supplied from the outside by means of an airtight terminal 8 '.

The engine section 5 and the compression mechanism section 6 are connected by means of a crankshaft 13.

An oil suction opening is formed in the central part of the crankshaft, which opens towards the bottom of the sealed container 3.

The screw centrifugal pump is arranged in an oil suction opening for supplying lubricating oil housed in the lower part of the sealed container 3 and for supplying lubricating oil to the sliding sliding part.

[0015]

The section e of the compression mechanism comprises an upper bearing 15, a lower bearing 16, a cylinder 17, an eccentric portion 13a of the crankshaft 13 housed in the cylinder 17, a roller 18, and a vane 19.

'10 [0016]

The crankshaft 13 is housed in a cylinder 17, the eccentric portion 13a being located in the cylinder 17.

The cylinder 17 has a suction opening and a discharge opening, the suction opening being connected to the suction pipe

A discharge valve is arranged on the underside of the discharge opening, which opens when the pressure is greater than or equal to a predetermined pressure.

[0017]

The roller 18 is mounted on an eccentric portion 13a, and the roller 18 can rotate eccentrically in the roller.

In addition, the vane 19 is slidably mounted in the cylinder 17.

The vane 19 is always pressed against the roller 18 by means of biasing means (not shown), and has the function of partitioning the space formed between the roller 17 and the roller 18 onto the compression chamber and the suction chamber.

At the upper and lower ends of the cylinder 17, an upper bearing 15 and a lower bearing 16 are respectively located for closing both end surfaces of the cylinder 17 and for accommodating the crankshaft 13.

The cylinder 17, the upper bearing 15 and the lower bearing 16 are fixed to each other by means of screws (not shown).

- 11 '[0018]

In the rotary compressor 100 having the configuration according to the embodiment of the present invention, the roller 18 rotates and slides in the roller 17 together with the rotation of the rotor 14.

As a result, the gas pipe 2 is compressed into a compression chamber, and is compressed into a compression chamber.

refrigerant being sucked in from the suction refrigerant, sucked in

The compressed high-pressure refrigerant gas is extruded into the sealed vessel 3, being extruded together with a compatible oil into the upper space of the sealed vessel 3 through the gap between the stator 12 and the rotor 14.

The high-pressure gaseous refrigerant, forced into the upper space of the sealed container 3 together with the compatible oil, impinges on the inner surface of the domed lid part 2a of the upper part 2 of the container.

At this time, the compatible oil is separated from the refrigerant due to the concentration difference between them.

The compatible oil, separated from the coolant, flows along the inner surface of the domed lid portion 2a toward the outer periphery of the stator 12, flows down through the gap between the bottom 1 of the vessel and the stator 12, and is returned and deposited in the bottom of the sealed vessel f.

The high-pressure gaseous refrigerant, separated from the compatible oil, is forced out of the discharge pipe 9 onto the outside of the sealed container 3.

- 12 [0019]

As already described above, in the rotary compressor 100 according to the embodiment of the present invention, the lid portion 2a of the upper portion 2 of the container in the sealed container 3 has a generally domed shape.

This will be described in more detail with reference to Fig. 2 and Fig. 3.

[0020]

Giant. 2 shows a cross-sectional view of the upper part of a vessel in a sealed vessel in a sealed compressor according to an embodiment of the present invention, i.e. in a rotary compressor.

Giant. 3 shows a top sectional view of the upper part of a container in a sealed container of a sealed compressor according to an embodiment of the present invention, i. for a rotary compressor.

In the rotary compressor 100 according to this embodiment, as shown in Fig. 2, the lid portion 2a of the upper portion 2 of the container, sealed container 3 has a generally domed shape by a combination of a spherical surface 31 in which the center of the arc is located on the inside of the sealed container 3. and a spherical surface 32, in which the center of the arc is located on the outside of the sealed container 3.

That is, in the lid portion 2a of the upper portion 2 of the container, then, the plurality of types of spherical surfaces 31 and 32 function as ribs.

13 [0021]

Thus, when the lid portion 2a of the upper portion of the container as a whole has a domed shape through a combination of a plurality of types of spherical surfaces 31 and 32 acting as ribs, it can be obtained that the rigidity and strength of the upper portion of the container can be higher than when the lid portion parts of the container are made flat or simply spherical.

[0022]

The radii R1 and R2 of the spherical surfaces having the largest surface areas at the spherical surfaces 31 and 32 of the upper part 2 of the container are arranged to be 0.4 to 1.2 times (preferably 0.6 times) the inner diameter D of the cylindrical part of the lower part. parts _! containers.

The lower limit of the radii R1 and R2 of the spherical surfaces having the largest surface areas is arranged as 0.4 times the inner diameter D of the cylindrical part of the lower part of the vessel, because if the radii R1 and R2 are smaller than this value, it is difficult to establish an airtight end 8_.

The upper limit of the radii R1 and R2 of the spherical surfaces having the largest surface areas is arranged as 1.2 times the inner diameter D of the cylindrical part of the lower part 7 of the container, because if the radii R1 and R2 are larger than this value, the spherical surfaces become essentially flat, so spherical shapes cannot be maintained and rigidity and strength cannot be guaranteed.

By setting the radii R1 and R2 of the spherical surfaces having the largest surface areas to 0.4 to 1.2 times the inner diameter D of the cylindrical portion of the lower portion 1 of the container, processability, rigidity, and strength can be easily achieved.

[0023]

The rotary compressor 100 according to this embodiment is located vertically, and the plurality of flat portions 33 where the airtight end 8 can be provided is arranged in one or more (in two case) positions on the lid portion 2a of the container upper part 2, as shown in Fig. 2a and Fig. 3.

The angles β of inclination of these flat parts 33 with respect to the horizontal plane are arranged in the range from 0 ° to 30 °, being the same in the direction of the angle of inclination in the side view.

The angles Θ of inclination of these flat parts 33 with respect to the horizontal plane are arranged in the range from 0 ° to 30 °,

for this range angles allows to make flat parts 33 watched domed face lid part 2a upper parts 2 containers, which allow e easy ensuring strength.

If the angles β of inclination of the flat portions 33 with respect to the horizontal plane are negative or greater than 30 °, then the flat portions 33 cannot follow the domed shape of the lid portion 2a of the container top portion 2 so that the shapes of the flat portions 33 deviate from the domed shape.

Therefore, it is very difficult to ensure strength.

15 [0024]

The total area of the flat portions 33 is limited to 0.1 to 0.4 times the cross-sectional area of the inner diameter D of the cylindrical portion in the lower portion 7 of the container.

The total area of the flat portions 33 is set to 0.1 to 0.4 times the cross-sectional area of the inner diameter D of the cylindrical portion in the lower portion 7 of the container, because if the total area of the flat portions 33 is set in the above range, the shapes of the flat portions 33 can follow the domed shape of the lid part 2a of the upper part 2 of the container, so that strength can be easily ensured.

If the total area of the flat portions 33 exceeds 0.4 times the cross-sectional area of the inner diameter D of the cylindrical portion in the lower portion 1 of the container, the shapes of the flat portions 33 cannot follow the domed shape of the lid portion 2a of the upper portion 2 of the container.

It is thus very difficult to ensure strength.

The airtight terminal 8 is attached to one of the flat portions 33, and the rod 11 to which the lid for protecting the airtight terminal 8 is attached is attached to the other of the flat portions 33 by rolling.

The rod 11 is set so that the angle Θ2 of its attachment to the flat part 33 is from 80 ° to 100 ° (preferably 90 °).

By setting the mounting angle to 80 ° to 100 °, workability can be ensured.

If the angle Θ2 of attaching the rod 11 to the flat portion 33 is set to an angle less than 80 °, or to an angle greater than 100 °, welding is difficult.

[0025]

Since the airtight end piece 8 and the rod 11 are thus attached to the flat portions 33, the angles of inclination Θ1 of which to the horizontal plane are set in the range of 0 ° to 30 °, having the same direction and angle of inclination in side view, the processability is high , the terminal cover can be easily shaped and the connection efficiency is high.

[0026]

Since the total area of the flat portions 33 is limited to 0.1 to 0.4 times the cross-sectional area of the inner diameter D of the cylindrical portion in the lower portion 7 of the container, deformation and stress around the airtight end 8 can be released.

[0027]

Since the angle β of attachment of the rod 11 to the flat portion 33 is set in the range of 80 ° to 100 °, the strength of the attachment can be easily ensured.

[0028]

In the rotary compressor 100 according to this embodiment, a compatible oil is used as the lubricating oil.

- 17Compatible oil has a high compatibility with the refrigerant, is very soluble in the refrigerant and has a high fluidity.

Therefore, the oil discharged from the compressor is easily returned to the compressor, and the amount of compatible oil that is discharged from the compressor and remains in the refrigeration circuit (i.e., the amount of compatible oil flowing out of the compressor into the refrigeration circuit) can be reduced.

This helps to facilitate the shape and construction of the cooling circuit.

[0029]

Giant. 4 is a characteristic view comparing the results of tests of the amount of deformation of the upper part of the vessel at the sealed vessel and the stresses near the airtight end of the sealed compressor according to an embodiment of the present invention, i. for a rotary compressor, with the amount of deformation of the flat upper part of the vessel (comparative example) and the stress near the airtight end.

The test results were obtained under the condition that the upper part 2 of the container according to the invention and the upper part 20 of the container according to the comparative example have the same plate thickness that the spherical radius is 0.7 times the inner diameter D of the cylindrical part of the lower part of the container.

- that the flat part is 0.25 times the cross-sectional area of the inner diameter D of the cylindrical part in the lower part of the container 1, and that the angle of inclination of the flat part with respect to the horizontal plane has been set at 10 °.

[0030]

As can be seen from Fig. 4, although the upper parts of the container have the same plate thickness, the amount of deformation and stress are smaller in the upper part 2 of the container according to this embodiment than in the upper part 20 of the container according to the comparative example.

[0031]

Although the spherical surfaces acting as ribs on the lid portion 2a of the upper part 2 of the container are formed by a plurality of types of spherical surfaces 31 and 32 in the above-described embodiment, they may be formed by combining a plurality of spherical surfaces 31 or spherical surfaces 32 of a single type.

In this case, the same functions and effects as in the above embodiment can be achieved.

[0032]

Although a single-cylinder rotary compressor has been described in the above-described embodiment as an example of a sealed compressor in which the present invention can be applied, the present invention is also applicable to a multi-cylinder rotary compressor or a screw compressor.

~ 19 [0033]

Although the discharge pipe 9 and the airtight end 8 are attached to the upper part 2 of the sealed container 3 in the above-described

design, so can be attached to the cylindrical part of the bottom

part 7 of the sealed container 3.

List of reference numerals [0034]

1 lower part 1 of the container 2 upper part 2 of the container 2a lid part 3 sealed container 4 section 4 of the compression mechanism 5 section 5 of the engine 6 intake silencer 6 7 suction pipe 8 airtight end cap 9 discharge pipe 11 rod 12 stator 13 crankshaft 13a eccentric part 14 rotor 15 upper bearing 16 lower bearing 17 cylinder 18 roller

2019 blade upper part 20 of the container according to the comparative example spherical surface 31, in which the center of the arc is located on the inside of the sealed container 3 spherical surface 32, located on the outer side in which the center of the arc is on the side of the sealed container 3

100 flat section rotary compressor (sealed compressor)

D - inner diameter D of the cylindrical part of the lower part of the vessel

RI - radius R1 of the spherical surface having the largest surface area

R2 - radius RI of the spherical surface having the largest surface area

Θ1 - angle Θ1 of inclination of the flat part with respect to the horizontal plane

- angle 02 of fixing the rod to the flat part

Legend to Fig. 4 comparative example - comparative example embodiment - design under load of 5 MPa - under load 5 MPa value in comparative example is 100% - value in comparative example is 100% deformation amount of vertex - amount of peak deformation stress proximity to terminal - voltage near the terminal

Claims (7)

PATENT CLAIMS A sealed compressor comprising a section of a compression mechanism and a section of an engine arranged in a sealed vessel, the engine section driving a section of the compression mechanism, and a discharge pipe and a suction pipe through which refrigerant circulates in the refrigeration circuit, the sealed vessel comprising the bottom of the vessel shaped. as a cylinder with a bottom, and an upper part of the container shaped as a cylinder with a lid and fixedly attached to the lower part of the container, and wherein the lid part of the upper part of the container has a domed shape formed by a plurality of spherical surfaces whose arc centers are located on the inside , a plurality of spherical surfaces whose arc centers are located on the outside of the sealed container, or a combination of a spherical surface whose arc center is located on the inside of the sealed container and a spherical surface whose arc center is located on the outside of the sealed container. A sealed compressor according to claim 1, characterized in that the radius of the spherical surface having the largest surface area at the spherical surfaces of the upper part of the vessel is 0.4 to 1.2 times the inner diameter of the cylindrical part of the lower part of the vessel. - 22 • ft A sealed compressor according to claim 1 or 2, characterized in that the upper part of the container of the sealed container is provided with an airtight end serving as a component for supplying the engine section and a flat part on which the airtight end is mounted, the flat part being arranged in at least one position, wherein the angle of inclination of the flat part with respect to the horizontal plane is from 0 ° to 30 ° when the sealed container is placed vertically. Sealed compressor according to claim 3, characterized in that a plurality of flat parts are arranged, which flat parts are the same in terms of inclination direction and inclination angle with respect to the horizontal plane in side view, the total area of the flat parts being 0.1 to 0. , 4 times the cross-sectional area of the inner diameter of the cylindrical portion of the lower portion of the container. The sealed compressor of claim 4, further comprising a rod for attaching a cap to protect the airtight terminal, the rod being located on one of the flat portions at an angle of from 80 ° to 100 ° relative to the flat portion. A sealed compressor according to any one of claims 1 to 5, characterized in that the refrigerant is a refrigerant having a saturation pressure higher than in the case of refrigerant R22. A sealed compressor according to any one of claims 1 to 6, characterized in that the compatible oil is used as a lubricating oil.