JP2023006134A - Compressor comprising oil equalizing seat - Google Patents

Abstract

To reduce a risk that refrigerator oil flows out to the outside of a compressor in a step of attaching an oil equalizing pipe to the compressor.SOLUTION: A compressor 91 comprises a casing 10, and an oil equalizing seat 19. The casing 10 houses oil L. The oil equalizing seat 19 is arranged on an outer surface 10e of the casing 10. The oil equalizing seat 19 is constituted so that an oil equalizing pipe 93 can be connected thereto. The oil equalizing seat 19 is closed by a plug 80 when the oil equalizing pipe 93 is not connected to the oil equalizing seat 19. The oil equalizing seat 19 comprises a first part 19a and a second part 19b. The first part 19a defines a passage space S1, and can be in contact with the plug 80. The second part 19b forms an enclosed space S2 in cooperation with the plug 80.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to compressors for refrigeration systems. Specifically, the present disclosure relates to compressors connected to oil equalizing tubes and refrigeration systems comprising multiple such compressors.

Some refrigeration systems have multiple compressors. In this case, as can be seen in Patent Document 1 (JP-A-2014-196874), a plurality of compressors are connected by oil equalizing pipes. The oil equalizing pipe is a pipe for passing refrigerating machine oil. If an imbalance occurs in the amount of refrigerating machine oil among a plurality of compressors, the imbalance is eliminated by the refrigerating machine oil passing through the oil equalizing pipe.

When the compressor is transported, the casing of the compressor is often filled with refrigerating machine oil. At this time, the opening for connecting the oil equalizing pipe provided in the casing of the compressor is closed with a plug.

At the installation site of a refrigeration system, the casings of multiple compressors are first tilted and then unplugged. This is to prevent the refrigerating machine oil from flowing out from the opening for connecting the oil equalizing pipe. Next, a plurality of compressors are connected by oil equalization pipes.

Even if the casing of the compressor is tilted, the refrigerating machine oil may flow out from the opening for connecting the oil equalizing pipe. The refrigerating machine oil that has flowed out adheres to the outer surface of the compressor casing. In this case, the assembly worker is forced to wipe off the refrigerating machine oil adhering to the outer surface of the casing.

A compressor according to a first aspect includes a casing and an oil equalizing seat. The casing contains oil. An oil leveling seat is located on the outer surface of the casing. The equalizer seat is configured to allow connection of an equalizer tube. The equalizing seat is blocked by a plug when the equalizing pipe is not connected to the equalizing seat. The oil leveling seat has a first portion and a second portion. The first portion defines a passageway space and is capable of contacting the plug. The second part cooperates with the plug to form an enclosed space.

According to this configuration, a predetermined amount of oil coming out of the interior of the casing is retained in the enclosed space defined by the second portion of the oil equalizing seat. Therefore, when the compressor is transported, oil leakage from the casing is suppressed by contact between the plug and the second portion.

In the compressor of the second aspect, in the compressor of the first aspect, when neither the oil equalizing pipe nor the plug is attached to the oil equalizing seat and the casing is inclined by an angle of 40° or less, the oil Stay in the enclosed space without moving beyond the two-part opening.

According to this configuration, even if the plug is not attached to the oil equalizing seat, there is little possibility that the predetermined amount of oil coming out of the casing will overflow from the oil equalizing seat. Therefore, oil leakage is further suppressed in the work of connecting the oil equalizing pipe.

A compressor according to a third aspect is the compressor according to the first aspect or the second aspect, wherein the volume of the surrounding space is 0.5 times or more the volume of the passage space.

According to this configuration, the enclosure space has a volume 0.5 times or more that of the passage space. Therefore, an enclosing space having a predetermined volume can hold the oil coming out of the interior of the casing.

A compressor according to a fourth aspect is the compressor according to any one of the first aspect to the third aspect, further comprising an oil pipe connected to the oil equalizing seat. The oil pipe has a horizontal portion that extends horizontally and an upright portion that intersects the horizontal portion. The uprights are located inside the casing.

According to this configuration, a portion of the oil pipe connected to the oil equalizer seat stands upright inside the casing. Therefore, the oil inside the casing gradually flows to the outside of the casing through the oil pipe, so oil leakage is further suppressed during the work of connecting the oil equalizing pipe.

The compressor of the fifth aspect is the compressor of the fourth aspect, wherein when the casing is tilted by 40°, the volume of oil located inside the oil pipe and above the oil surface inside the casing is , less than the sum of the volume of the passage space and the volume of the enclosing space.

According to this configuration, the oil located inside the oil pipe and above the oil surface inside the casing is accommodated in the passage space and the surrounding space. Therefore, oil leakage is further suppressed in the work of connecting the oil equalizing pipe.

A compressor according to a sixth aspect is the compressor according to any one of the first aspect to the fifth aspect, wherein the plug has a flat portion, a contact portion, and an extension portion. The flat plate portion is configured to block the opening of the second portion. The contact portion is configured to connect to the flat plate portion and contact the first portion. The extension extends from the contact portion into the interior space of the casing.

According to this arrangement, the plug has an extension. Therefore, it is ensured that the oil coming out of the inside of the casing is contained in the passage space and the surrounding space even if the dimension of the upright portion of the oil pipe is further increased by a design change.

A refrigeration system according to a seventh aspect includes the compressor according to any one of the first to sixth aspects, and a heat exchanger.

According to this configuration, oil leakage is suppressed in the compressor mounted on the refrigeration system. Therefore, it is easy to manufacture the refrigerating device.

4 is a circuit diagram of the refrigeration system 400. FIG. It is a sectional view of compressor 91 concerning a 1st embodiment. It is a sectional view of compressor 91 concerning a 1st embodiment. This figure shows a portion of FIG. 2 on an enlarged scale. It is a sectional view of compressor 91 concerning a 1st embodiment. In this view the plug 80 has been removed from the oil equalizer seat 19 . Fig. 3 is a cross-sectional view of a plug 80 attached to an oil leveling seat 19 of a compressor 91 according to the first embodiment; It is a sectional view of compressor 91 concerning a 1st embodiment. In this figure, an oil equalizing pipe 93 is attached to the oil equalizing seat 19 . It is a sectional view of compressor 91 concerning a 1st embodiment. In this figure, the compressor 91 is tilted by an angle θ. It is a sectional view of compressor 91 concerning the 1st modification of a 1st embodiment. FIG. 4 is a cross-sectional view of a plug 80 attached to an oil equalizing seat 19 of a compressor 91 according to a first modified example of the first embodiment; It is a sectional view of compressor 91 concerning a 2nd embodiment. It is a sectional view of compressor 91 concerning a 2nd embodiment. This figure shows an enlarged part of FIG. In this view the plug 80 has been removed from the oil equalizer seat 19 . It is a sectional view of compressor 91 concerning a 2nd embodiment. In this figure, an oil equalizing pipe 93 is attached to the oil equalizing seat 19 . It is a sectional view of compressor 91 concerning a 2nd embodiment. In this figure, the compressor 91 is tilted by an angle θ.

<First Embodiment>
(1) Overall Configuration FIG. 1 shows a refrigerant circuit of a refrigeration system 400 according to the first embodiment. The refrigerating device 400 is, for example, an air conditioner, a refrigerator, a freezer, a water heater, or the like. The refrigerator 400 has a heat source unit 100 , a utilization unit 200 and a connecting pipe 300 .

The heat source unit 100 includes a first compressor 91, a second compressor 92, an oil equalizing pipe 93, a four-way switching valve 110, a heat source heat exchanger 120, a heat source fan 130, a heat source expansion valve 140, a liquid closing valve 150, a gas It has a closing valve 160 .

The utilization unit 200 has a utilization heat exchanger 220 and a utilization fan 230 .

The connecting line 300 has a liquid connecting line 310 and a gas connecting line 320 .

When the refrigeration system 400 performs cold heat utilization operation, the four-way switching valve 110 forms the connection indicated by the solid line in FIG. In cold utilization operation, utilization heat exchanger 220 functions as an evaporator and cooperates with utilization fan 230 to provide cold energy to the user. When the refrigeration system 400 performs thermal operation, the four-way switching valve 110 forms the connection of the dashed line in FIG. 1 and the refrigerant circulates in the direction of the arrow H. In thermal utilization operation, utilization heat exchanger 220 functions as a condenser and cooperates with utilization fan 230 to provide thermal heat to the user.

(2) Detailed Configuration of Compressor 91 FIG. 2 shows a cross section of the first compressor 91 according to the first embodiment. The first compressor 91 draws in low pressure gaseous refrigerant and compresses it to produce high pressure gaseous refrigerant. The structure of the first compressor 91 will be described below. Since the second compressor 92 has the same structure as the first compressor 91, the description of the structure of the second compressor 92 is omitted.

Compressor 91 is a rotary compressor. The compressor 91 has a casing 10 , a suction pipe 15 , a discharge pipe 16 , an oil equalizing seat 19 , a motor 20 , a crankshaft 30 and a compression mechanism 40 .

(2-1) Casing 10, suction pipe 15, discharge pipe 16, oil equalizer 19
The casing 10 houses various components of the compressor 91, refrigerant, and refrigerating machine oil L. As shown in FIG. The casing 10 has a body portion 11, a lid portion 12 and a bottom portion 13 which are airtightly connected.

A suction pipe 15 for sucking low-pressure gas refrigerant is attached to the body portion 11 . A discharge pipe 16 for discharging high-pressure gas refrigerant is attached to the lid portion 12 . Inside the casing 10, an oil storage portion 17 for storing the refrigerating machine oil L is provided. Oil reservoir 17 is located near bottom 13 . Refrigerant oil L is filled over the height from bottom 13 to oil level U. As shown in FIG.

The body portion 11 is provided with an opening 18 for connecting the oil equalizing pipe 93 . An oil leveling seat 19 is attached to the opening 18 . The opening 18 is closed with a plug 80 .

The arrangement of components described above is merely an example. Where the suction pipe 15, the discharge pipe 16, and the oil equalizing seat 19 are installed in the casing 10 may be changed as appropriate.

(2-2) Motor 20
The motor 20 receives power from the outside of the compressor 91 and generates power to drive the compression mechanism 40 . A motor 20 is attached to the body 11 . The motor 20 has a stator 21 and a rotor 22 .

The stator 21 has a cylindrical shape and is fixed to the body portion 11 . Stator 21 converts the power into an alternating magnetic field. The rotor 22 is arranged inside the stator 21 . The rotor 22 rotates around the rotation axis RA by interacting with the alternating magnetic field generated by the stator 21 .

(2-3) Crankshaft 30
The crankshaft 30 is fixed to the rotor 22 and rotates together with the rotor 22 about the rotation axis RA. Crankshaft 30 transmits the rotational force generated by rotor 22 to compression mechanism 40 .

The crankshaft 30 has a main shaft portion 31 that is concentric with the rotation axis RA, and an eccentric portion 32 that is eccentric with respect to the rotation axis RA. A portion of the main shaft portion 31 is fixed to the rotor 22 . Eccentric portion 32 is located within compression mechanism 40 .

(2-4) Compression mechanism 40
The compression mechanism 40 generates high pressure gas refrigerant by compressing low pressure gas refrigerant. The compression mechanism 40 has a cylinder 41 and a piston 42 . Cylinder 41 and piston 42 define a compression chamber 45 . The piston 42 is a cylindrical member. The eccentric portion 32 is inserted into the cavity of the piston 42 . The piston 42 revolves while being in contact with the cylinder 41 due to the rotation of the crankshaft 30 . The volume of the compression chamber 45 changes according to the motion of the piston 42 .

Typically, the oil level U of the refrigerating machine oil L reaches the compression mechanism 40 , so that the compression mechanism 40 is at least partially submerged in the refrigerating machine oil L.

(3) Structure of Oil Equalizer Seat 19 FIG. 3 is an enlarged view of a part of FIG. The oil leveling seat 19 is arranged on the outer surface 10 e of the casing 10 . An oil equalizing pipe 93 can be connected to the oil equalizing seat 19 . When the oil equalizing pipe 93 is not connected to the oil equalizing seat 19 , the oil equalizing seat 19 can be blocked by the plug 80 .

As shown in FIG. 4, the oil leveling seat 19 has a first portion 19a and a second portion 19b. The first portion 19a defines a passageway space S1. The passage space S1 allows communication between the inside and the outside of the casing 10, thereby allowing the refrigerating machine oil L to move. The first portion 19a can contact the plug 80. As shown in FIG. The second portion 19b has an opening 19z that opens outward. The second portion 19b forms an enclosing space S2.

FIG. 5 shows a cross-section of plug 80 . In the figure, the oil leveling seat 19 is indicated by a dashed line. The plug 80 has a flat plate portion 81 and a contact portion 82 . The contact portion 82 connects to the flat plate portion 81 . When the plug 80 is attached to the oil leveling seat 19 , the flat plate portion 81 closes the opening 19 z of the second portion 19 b of the oil leveling seat 19 . When the plug 80 is attached to the oil leveling seat 19 , the contact portion 82 contacts the first portion 19 a of the oil leveling seat 19 .

(4) Method of Attaching Oil Equalizing Pipe 93 FIG. 6 shows the oil equalizing seat 19 to which the oil equalizing pipe 93 is attached. The plug 80 is removed from the equalizer seat 19 before the oil equalizer tube 93 is attached to the equalizer seat 19 . In order to prevent the refrigerating machine oil L from flowing out from the opening 18 of the casing 10 when the plug 80 is removed, the compressor 91 is tilted by an angle θ as shown in FIG.

When neither the oil equalizing pipe 93 nor the plug 80 is attached to the oil equalizing seat 19 and the casing 10 is tilted by the angle θ, the refrigerating machine oil L does not move beyond the opening 19z of the second portion 19b. Stay in the enclosed space S2. Here, the angle θ is, for example, an angle of 40° or less.

The first volume V1 shown in FIG. 4 is the volume of the passageway space S1. The second volume V2 is the volume of the enclosing space S2. The second volume V2 is 0.5 times or more the first volume V1.

(5) Features (5-1)
The plug 80 contacts the first portion 19 a to prevent the refrigerating machine oil L from flowing out of the casing 10 .

(5-2)
Even if the plug 80 is not attached to the oil leveling seat 19 , the predetermined amount of refrigerating machine oil L coming out of the casing 10 is less likely to overflow from the oil leveling seat 19 . Therefore, leakage of the refrigerating machine oil L is further suppressed in the work of connecting the oil equalizing pipe 93 .

(5-3)
The enclosing space S2 has a volume 0.5 times or more that of the passage space S1. Therefore, the surrounding space S2 having a predetermined volume can hold the refrigerating machine oil L coming out of the casing 10 .

(5-4)
In the compressors 91 and 92 mounted on the refrigerating device 400, leakage of the refrigerating machine oil L is suppressed. Therefore, it is easy to manufacture the refrigerating device 400 .

(6) Modification (6-1) First Modification (6-1-1) Configuration FIGS. 8 and 9 are sectional views of a compressor 91 according to a first modification of the first embodiment. The first modification differs from the first embodiment in that the plug 80 has not only a flat plate portion 81 and a contact portion 82 but also an extension portion 83 .

As shown in FIG. 8, when the plug 80 is attached to the oil equalizing seat 19, the flat plate portion 81 closes the opening 19z of the second portion 19b. When the plug 80 is attached to the oil equalizing seat 19, the contact portion 82 is connected to the flat plate portion 81 and contacts the first portion 19a. When the plug 80 is attached to the oil equalizing seat 19 , the extension portion 83 extends from the contact portion 82 into the internal space of the casing 10 .

(6-1-2) Features The stopper 80 has an extension portion 83 . Therefore, the extended portion 83 reduces the possibility that the refrigerating machine oil L leaks from the gap between the first portion 19 a and the contact portion 82 .

(6-2) Second Modification The compressor 91 of the first embodiment is a rotary compressor. Alternatively, compressor 91 may be a type of compressor other than a rotary compressor, such as a scroll compressor.

<Second embodiment>
(1) Configuration FIG. 10 shows a cross section of a compressor 91 according to the second embodiment. A compressor 91 according to the second embodiment differs from the first embodiment in that an oil pipe 60 is provided. As shown in FIG. 11 , the oil pipe 60 is connected to the oil equalizer seat 19 .

As shown in FIG. 12 , the oil pipe 60 has a horizontal portion 61 and an upright portion 62 . The horizontal portion 61 extends horizontally. The upright portion 62 intersects the horizontal portion 61 . The uprights 62 are located inside the casing 10 .

The third volume V3 shown in FIG. 13 is defined as the volume of the refrigerating machine oil located inside the oil pipe 60 and above the oil level U inside the casing 10 when the casing 10 is tilted by an angle θ. be. The sum V0 shown in FIG. 11 is the sum (V1+V2) of the first volume V1, which is the volume of the passage space S1, and the second volume V2, which is the volume of the surrounding space S2. The third volume V3 is less than the sum V0. The angle θ is, for example, 40°.

(2) Features (2-1)
A part of the oil pipe 60 connected to the oil equalizing seat 19 stands upright inside the casing 10 . Therefore, since the refrigerating machine oil L inside the casing 10 gradually flows to the outside of the casing 10 through the oil pipe 60 , the leakage of the refrigerating machine oil L is further suppressed in the connection work of the oil equalizing pipe 93 .

(2-2)
The refrigerating machine oil L located inside the oil pipe 60 and above the oil surface U inside the casing 10 is accommodated in the passage space S1 and the surrounding space S2. Therefore, leakage of the refrigerating machine oil L is further suppressed in the work of connecting the oil equalizing pipe 93 .

(3) Modifications Each modification of the first embodiment may be applied to the second embodiment. For example, when applying the first modification of the first embodiment to the second embodiment, the extension 83 of the plug 80 is inserted into the oil pipe 60 . In this case, the extension 83 reduces the amount of refrigerating machine oil L entering the oil pipe 60 . Therefore, even if the dimension of the upright portion 62 of the oil pipe 60 is increased due to a design change, it is possible to ensure that the refrigerating machine oil L coming out of the casing 10 is contained in the passage space S1 and the surrounding space S2. to

<Conclusion>
Although embodiments of the present disclosure have been described above, it will be appreciated that various changes in form and detail may be made without departing from the spirit and scope of the present disclosure as set forth in the appended claims. .

10: Casing 10e: Outer surface 17: Oil reservoir 18: Opening 19: Oil leveling seat 19a: First part 19b: Second part 19z: Opening 20: Motor 30: Crankshaft 40: Compression mechanism 60: Oil pipe 61: Horizontal part 62: Upright portion 80: Plug 81: Flat plate portion 82: Contact portion 83: Extension portion 91: First compressor (compressor)
92: second compressor (compressor)
93: Oil equalizing pipe 100: Heat source unit 110: Four-way switching valve 120: Heat source heat exchanger 130: Heat source fan 140: Heat source expansion valve 200: Utilization unit 220: Utilization heat exchanger 230: Utilization fan 400: Refrigeration device L: Refrigeration Machine oil S1: Passage space S2: Surrounding space U: Oil level V0: Total sum V1: First volume (volume)
V2: second volume (volume)
V3: third volume (volume)
θ : angle

JP 2014-196874 A

Claims (7)

a casing (10) containing oil (L);
A first An oil leveling seat (19) having a portion (19a) and a second portion (19b), said first portion defining a passageway space (S1) and capable of contacting said plug; an oil leveling seat (19) cooperating with said plug to form an enclosing space (S2);
A compressor (91, 92) comprising: When neither the oil equalizing tube nor the plug is attached to the oil equalizing seat and the casing is tilted by an angle of 40° or less, the oil flows over the opening (19z) of the second part. remain in the enclosed space without moving;
A compressor according to claim 1 . The volume of the enclosing space (V2) is 0.5 times or more the volume of the passage space (V1),
The compressor according to claim 1 or 2. an oil pipe (60) connected to the equalizing oil seat;
further comprising
The oil pipe has a horizontal portion (61) extending horizontally and an upright portion (6) intersecting the horizontal portion.
2),
the uprights are positioned inside the casing;
A compressor according to any one of claims 1 to 3. When the casing is tilted by 40°, the oil volume (V3) located inside the oil pipe and above the oil level (U) inside the casing is equal to the volume of the passage space less than the sum (V0) of (V1) and the volume (V2) of said enclosed space;
A compressor according to claim 4 . The plug includes a flat plate portion (81) configured to block the opening (19z) of the second portion, and a contact portion (82) connected to the flat plate portion and configured to contact the first portion. ) and an extension (83) extending from the contact portion into the interior space of the casing,
A compressor according to any one of claims 1 to 5. A compressor according to any one of claims 1 to 6;
a heat exchanger (120);
A refrigeration device (400) comprising:

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