JP2014101811A - Compressor having rotary compression mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor which has a simple structure, enables easy assembly, and collects a lubrication oil in a refrigerant at low cost.SOLUTION: A mist collection member 80 is provided at a space between a cylindrical part 72 of a muffler cover 70 and a boss part 62, which serves as an outlet port 69 of a refrigerant from an upper muffler chamber M2, to collect a lubrication oil mixed in the refrigerant. The mist collection member 80 is housed in a peripheral groove 66 formed at the boss part 62 and is held in the space between the boss part 62 and the cylindrical part 72 of the muffler cover 70.

Description

  The present invention relates to a compressor having a rotary compression mechanism.

For example, in an air conditioner such as a room air conditioner or a packaged air conditioner, a rotary compressor is used for compressing a gaseous refrigerant in a refrigerant circuit.
In recent years, so-called scrotary compressors having a rotary compression mechanism on the lower stage side and a scroll compression mechanism on the higher stage side have also appeared.

  In a compressor having these rotary compression mechanisms, a sliding portion between a cylinder provided in a casing of the compressor and a piston provided eccentrically with a crankshaft penetrating the cylinder, the crankshaft is rotatable. It is necessary to reduce the sliding resistance of the supporting bearing or the like. For this reason, in the rotary compressor, lubricant is mixed with the refrigerant and sent to the rotary compression mechanism.

  It is necessary to prevent the lubricating oil mixed in the refrigerant from flowing into the refrigeration circuit outside the casing. Therefore, Patent Literature 1 includes a muffler provided so as to cover a discharge port formed in a bearing head of a rotary compression mechanism, and a net-like substance provided in a cover of the muffler. A technique for collecting a mist of lubricating oil mixed in a refrigerant with a net-like substance is disclosed. Also disclosed is a technique in which a double cover is provided on the outside of the muffler, and a network material is provided between the two covers.

JP-A-4-134196 (FIGS. 1 and 4)

However, the configuration described in Patent Document 1 has a problem that it takes time to perform the work because the cover must be filled with a mesh-like substance.
Further, the structure in which the cover is provided on the outer side of the muffler and the mesh material is provided between the two covers has a problem that the structure is complicated, the number of parts is increased, and the cost is increased.

  The present invention has been made in view of such circumstances, and has a simple configuration, can be easily assembled, and can collect lubricating oil in the refrigerant at low cost. It aims at providing the compressor which has.

In order to solve the above problems, the compressor having the rotary compression mechanism of the present invention employs the following means.
The present invention includes, in a housing, a rotary compression mechanism unit that compresses gas and a drive unit that drives the rotary compression mechanism unit, and the rotary compression mechanism unit includes a cylinder having a cylindrical inner surface, And a crankshaft having an eccentric shaft portion that is eccentric with respect to the center axis of the cylinder in the cylinder, and both ends of the cylinder. A plate member that closes each of the opening portions, an exhaust port that is formed in at least one of the plate members and communicates with the inside of the cylinder, and the plate member in which the exhaust port is formed. Is inserted into the cylindrical boss, which rotatably supports the crankshaft, and the outer periphery abuts the plate member. In addition, the muffler cover that forms an muffler chamber in which the inner peripheral portion faces the outer peripheral surface of the boss portion and the refrigerant is discharged from the cylinder through the exhaust port, the inner peripheral portion of the muffler cover, and the A refrigerant outlet formed between the boss portion and the outer peripheral surface of the boss portion for sending the refrigerant into the housing from the muffler chamber, and a trap for collecting lubricating oil mixed in the refrigerant provided at the refrigerant outlet. A collecting member, and a circumferential groove continuous in the circumferential direction of the boss portion is formed in the boss portion at a position facing the inner circumferential portion of the muffler cover. It is arrange | positioned in a groove | channel, It is provided between the inner peripheral part of the said muffler cover, and the outer peripheral surface of the said boss | hub part, It is characterized by the above-mentioned.
In this way, the collection member is disposed in the circumferential groove formed in the boss portion, so that the collection member is positioned reliably, and between the inner periphery of the muffler cover and the outer periphery of the boss. It can be provided at the refrigerant delivery port. At this time, it is not necessary to prepare a special part for providing the collecting member, and a simple configuration with a small number of parts can be obtained.

A communication port is formed between the outer periphery of the muffler cover and the plate member so as to communicate between the inside and the outside of the muffler chamber. The communication port is formed between an end portion on the muffler chamber side and an end portion on the outside of the muffler chamber. You may make it have a bending part or a curved part in between.
From the communication port, the lubricating oil collected from the refrigerant by the collecting member can be sent out from the muffler chamber to the internal space of the housing outside the muffler chamber. At this time, since the communication port is bent or curved in the middle thereof, the lubricating oil is difficult to flow out of the muffler chamber, and it is easy to maintain the refrigerant pressure in the muffler chamber high by securing the pressure loss.

  The compressor may further include a scroll compression mechanism having a fixed scroll fixed to the housing side, and a turning scroll that eccentrically turns with respect to the fixed scroll by the crankshaft.

  According to the compressor having the rotary compression mechanism of the present invention, the assembly can be easily performed with a simple configuration, and the lubricating oil in the refrigerant can be collected at a low cost.

It is an elevation sectional view showing the composition of the compressor which has the rotary compression mechanism of the present invention. It is sectional drawing to which some compressors which have the rotary compression mechanism of this invention were expanded. It is a figure which shows the principal part of the compressor which has the rotary compression mechanism of this invention, Comprising: (a) is aa sectional drawing of (b), (b) is a plane sectional view of (a). It is a figure which shows the other example of the communicating port formed in the compressor which has the rotary compression mechanism of this invention, Comprising: (a) is aa sectional drawing of (b), (b) is a plane cross section of (a). FIG. It is an elevational sectional view showing still another example of the communication port formed in the compressor having the rotary compression mechanism of the present invention. It is a figure which shows the other example of the compressor which has the rotary compression mechanism of this invention, Comprising: It is an elevation sectional drawing of the compressor provided with the rotary compression mechanism in the low stage side, and the scroll compression mechanism in the high stage side.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a compressor 1 according to the present embodiment is provided on a refrigerant circuit of an air conditioner such as a room air conditioner or a packaged air conditioner, and is used for compression of a gaseous refrigerant flowing through the refrigerant circuit. Is.
The compressor 1 has a housing 2 that is a substantially cylindrical sealed container with both ends closed, and is installed with the axis of the housing 2 being substantially vertical.
The housing 2 accommodates a rotary compression mechanism 3 that compresses the gaseous refrigerant supplied from the refrigerant circuit, and a drive unit 4 that drives the rotary compression mechanism 3. The rotary compression mechanism 3 is disposed below the housing 2, and the drive unit 4 is disposed above the rotary compression mechanism 3.

A refrigerant pipe P1 of the refrigerant circuit is inserted from the outside into the lower side surface of the housing 2, and the refrigerant refrigerant P1 is supplied with gaseous refrigerant of the refrigerant circuit to the rotary compression mechanism 3.
Here, although not shown, an oil sump chamber is provided at the bottom of the housing 2, and lubricating oil used for lubricating the rotary compression mechanism 3 and the like is stored in the oil sump chamber.

The rotary compression mechanism 3 compresses the gaseous refrigerant supplied from the refrigerant pipe P <b> 1 to form a high-pressure compressed gas, and then sends the compressed gas into the housing 2.
Here, a refrigerant pipe P3 is inserted from the outside into the ceiling portion of the housing 2, and the compressed gas temporarily stored in the housing 2 is sent to the downstream side of the refrigerant circuit through the refrigerant pipe P3. It has become.

The rotary compression mechanism 3 has a cylinder 11 having a cylindrical inner surface 12. The cylinder 11 is arranged such that its cylindrical inner surface 12 is substantially coaxial with the housing 2. Inside the cylinder 11, a cylindrical rotor 14 having a smaller diameter than the cylindrical inner surface 12 is provided with its axis substantially parallel to the axis of the cylindrical inner surface 12.
Here, the cylinder 11 and the rotor 14 may include a plurality of sets at intervals along the central axis direction of the housing 2.

  A crankshaft 16 having an axis coaxial with the cylinder 11 is inserted into the cylinder 11 and the rotor 14. Here, the crankshaft 16 is supported at the upper end side by the drive unit 4 and is driven to rotate about the axis by the drive unit 4. In the present embodiment, the drive unit 4 is configured by an electric motor having a rotor that holds the upper end side of the crankshaft 16. The crankshaft 16 is driven to rotate by rotating the rotor by the drive unit 4.

The drive unit 4 includes a rotor 21 that is fitted and fixed to the crankshaft 16, and a stator 22 that is disposed on the outer peripheral side of the rotor 21.
The rotor 21 has a core (hereinafter referred to as “rotor core”) 23 in which a plurality of thin bodies such as silicon steel plates formed in a predetermined shape are stacked. An axial hole 24 is formed in the rotor core 23 along the central axis thereof, and the crankshaft 16 is press-fitted into the axial hole 24. The rotor core 23 is provided with a plurality of through holes (hereinafter referred to as “passages”) 25 extending in the vertical direction along the axial hole 24. The lower sides of the passages 25 are open ends.
Further, a disc-shaped oil separation plate 28 is attached to the upper end surface 23a of the rotor core 23 so as to cover the upper end surface 23a.

  The stator 22 includes a core (hereinafter referred to as “stator core”) 30 in which a plurality of thin bodies such as silicon steel plates formed in a predetermined shape are stacked, and a coil end 31 wound around a tooth portion of the stator core 30. have. The stator core 30 is press-fitted and fixed (shrink-fitted) in the housing 2.

  A substantially cylindrical eccentric shaft portion 17 is provided in a region of the crankshaft 16 that is inserted into the cylinder 11. The crankshaft 16 is rotationally driven around the axis, whereby the rotor 14 is rotated eccentrically so as to roll along the cylindrical inner surface 12 of the cylinder 11.

Further, the lower end side of the crankshaft 16 is supported by the end bearing 40 so as to be rotatable around the axis.
As shown in FIGS. 1 and 2, the end bearing 40 includes a lower bearing bracket 41 provided below the cylinder 11 and an upper bearing bracket 60 provided above the cylinder 11.

The lower bearing bracket 41 has a disk-like lower plate portion (plate member) 43 that abuts against the lower surface of the cylinder 11. A shaft hole 44 is formed through the lower bearing bracket 41 at the center thereof, and the crankshaft 16 is rotatably supported by the shaft hole 44 via a bearing (not shown).
In the lower plate portion 43, a refrigerant exhaust port 45 is formed through the upper and lower surfaces of the lower plate portion 43 at a position facing the cylindrical inner surface 12 of the cylinder 11.
Furthermore, on the lower surface side of the lower plate portion 43, a boss portion 46 and an outer peripheral wall portion 47 that rise downward are formed at the center portion and the outer peripheral portion, and between the boss portion 46 and the outer peripheral wall portion 47, A tubular groove 48 continuous in the circumferential direction is formed. The refrigerant exhaust port 45 is formed so as to face the groove 48.
The lower bearing bracket 41 is fastened to the cylinder 11 by bolts 55 at a plurality of locations in the circumferential direction of the outer periphery.

  An end plate 49 is fixed below the lower plate portion 43, and the end plate 49 and the plate 51 close the groove 48 to form an annular lower muffler chamber M1. The refrigerant discharged from the port hole 45 passes through a communication hole 101 provided in the lower plate 43, the cylinder 11 and the upper bearing blanket 60 and leads to an upper muffler chamber M2 described later. The refrigerant is combined with the refrigerant discharged from the port hole 65 in the upper muffler chamber M2, and flows from the refrigerant outlet 69 into the compressor. Therefore, the compressed refrigerant always passes between the mesh substances 80 in the muffler.

  Further, the end plate 49 closes the shaft hole 44. The end plate 49 is formed with a lubricating oil passage 49 a penetrating the lubricating oil from the oil reservoir chamber at the bottom of the housing 2 and supplying it to the crankshaft 16 in the shaft hole 44.

  As shown in FIGS. 2 and 3, the upper bearing bracket 60 includes a disk-shaped upper plate portion (plate member) 61 that abuts the lower surface of the cylinder 11, and a boss portion 62 that extends upward from the upper plate portion 61. ,have. The upper bearing bracket 60 has a shaft hole 63 formed through the center thereof, and the crankshaft 16 is rotatably supported by the shaft hole 63 via a bearing (not shown).

  In the upper plate portion 61, a refrigerant exhaust port (exhaust port) 65 is formed through the upper and lower surfaces of the upper plate portion 61 at a position facing the cylindrical inner surface 12 of the cylinder 11.

  A circumferential groove 66 having a height defined in the vertical direction and continuous in the circumferential direction is formed on the outer circumferential surface 62 a of the boss portion 62.

A dome-shaped muffler cover 70 is provided on the upper surface of the upper plate portion 61. The muffler cover 70 has a dome shape whose outer diameter gradually decreases as it goes upward from the outer peripheral portion 70a, and an opening 71 is formed at the top (inner peripheral portion) 70b. The muffler cover 70 is fastened to the cylinder 11 together with the upper plate portion 61 by bolts 67 at a plurality of locations in the circumferential direction of the outer peripheral portion with the outer peripheral portion being in contact with the upper surface of the upper plate portion 61. In this state, the boss portion 62 penetrates through the opening 71 in a state of protruding upward.
A muffler chamber (muffler chamber) M <b> 2 that is continuous in the circumferential direction is formed around the boss portion 62 between the muffler cover 70 and the upper plate portion 61 and the boss portion 62.

  The opening 71 is formed by a cylindrical portion 72 that rises upward. The cylindrical portion 72 is disposed so as to face the circumferential groove 66 with an interval on the outer circumferential side with the muffler cover 70 fixed to the upper plate portion 61. Thereby, an annular gap is formed between the top portion 70b of the muffler cover 70 and the boss portion 62, and this gap serves as a refrigerant delivery port 69 for the refrigerant from the muffler chamber M2.

A mist collecting member (collecting member) 80 having a steel wool shape, a net shape, a porous shape, or the like is disposed in the circumferential groove 66 and is sandwiched between the cylindrical portion 72 of the muffler cover 70. .
This mist collecting member 80 may be formed in a cylindrical shape in advance in a circumferential groove 66, or may be disposed in a circumferential shape of the circumferential groove 66, for example, in a belt shape or tape shape. You may do it.

As shown in FIG. 3, for example, a metal plate 75 is sandwiched between the upper plate portion 61 and the muffler cover 70. The plate 75 is formed with a communication port 76 at the outer peripheral portion thereof for communicating the upper muffler chamber M2 and the space on the outer peripheral side of the upper bearing bracket 60.
The communication port 76 is preferably formed with a cross-sectional area as small as possible so that pressure loss occurs. Therefore, in this embodiment, the communication port 76 is formed in a groove shape on the one surface side of the plate 75.

In such a rotary compression mechanism 3, the gaseous refrigerant supplied from the refrigerant pipe P <b> 1 into the cylinder 11 is compressed by the rotor 14 that rotates eccentrically in the cylinder 11. The compressed refrigerant is discharged from the upper and lower refrigerant exhaust ports 45 and 65 of the cylinder 11 to the lower muffler chamber M1 and the upper muffler chamber M2, and is sent into the housing 2 from the lower muffler chamber M1 and the upper muffler chamber M2. The refrigerant discharged into the lower muffler chamber M1 and the upper muffler chamber M2 includes lubricating oil sucked up from the oil reservoir chamber at the bottom of the housing 2 through the lubricating oil passage 49a in order to lubricate the movable portion of the rotary compression mechanism 3. Are mixed.
The refrigerant sent into the housing 2 passes through a passage 25 formed in the rotor core 23 and is sent out from the refrigerant pipe P3 on the ceiling portion of the housing 2 to the downstream side of the refrigerant circuit.

Here, in the upper muffler chamber M2, the refrigerant mixed with the lubricating oil discharged from the refrigerant exhaust port 65 into the upper muffler chamber M2 is discharged between the cylindrical portion 72 and the boss portion 62 of the muffler cover 70. It is fed into the housing 2 through a mist collecting member 80 provided at the outlet 69. Lubricating oil mixed in the refrigerant is collected when passing through the mist collecting member 80, whereby the refrigerant is delivered into the housing 2.
The collected lubricating oil falls on the upper plate portion 61 by its own weight, is pressed by the gas pressure of the refrigerant in the upper muffler chamber M2, and is pushed out into the housing 2 through the communication port 76 in the outer peripheral portion of the plate 75. It falls into the oil sump chamber at the bottom of the housing 2.

  According to the configuration described above, the lubricating oil mixed in the refrigerant can be collected by providing the mist collecting member 80 at the refrigerant delivery port 69 from the upper muffler chamber M2. The mist collecting member 80 is housed in a circumferential groove 66 formed in the boss portion 62 and is held between the boss portion 62 and the cylindrical portion 72 of the muffler cover 70. For this reason, at the time of assembly, the mist collecting member 80 can be easily and reliably positioned and arranged in the delivery portion between the cylindrical portion 72 and the boss portion 62 of the muffler cover 70. As a result, the compressor 1 has a simple configuration with a small number of parts, is easy to assemble, and can reliably collect lubricating oil at low cost.

By the way, in the above, the plate 75 having the communication port 76 is provided. Instead, instead of the plate 75 such as a rubber-based material, a cork-based material, copper, or aluminum as shown in FIG. A gasket 77 made of a flexible material can also be used. In this case, the communication port 78 is preferably provided with a bent portion 78c or a curved portion between an end portion 78a inside the muffler chamber M2 and an end portion 78b outside the muffler chamber M2. The communication port 78 shown in FIG. 4 is bent in a crank shape, for example.
If it does in this way, it will become difficult for lubricating oil to flow out of the muffler chamber M2 through the communicating port 78, the pressure loss in this part can be ensured, and the refrigerant | coolant pressure in the muffler chamber M2 can be maintained high.
Since the bent communication port 78 is made of a material that is more flexible than the plate 75, the communication port 78 can be easily finely processed.
Further, the gasket 77 can be made thinner than the plate 75. Therefore, it is possible to prevent the refrigerant pressure in the upper muffler chamber M2 from being released by making the cross-sectional area of the communication port 78 smaller and bending it in a crank shape.

Further, as shown in FIG. 5, instead of the communication ports 76 and 78, the upper plate portion 61 has one end opened on the upper surface 61 a and the other end penetrated the outer peripheral surface 61 b of the upper plate portion 61. 79 may be formed.
In addition, a cutout, a groove, a recess, or the like that communicates the inside and outside of the muffler chamber M <b> 2 may be formed in a portion of the outer peripheral portion 70 a of the muffler cover 70 facing the upper plate portion 61.

As shown in FIG. 6, the compressor 100 having the rotary compression mechanism of the present invention may be configured to include a scroll compression mechanism 90 at the upper end portion of the crankshaft 16 in addition to the above configuration. it can. The scroll compression mechanism 90 includes a turning scroll 91 provided at the upper end portion of the crankshaft 16 and a fixed scroll 92 fixed to the housing 2. The orbiting scroll 91 and the fixed scroll 92 have disc-shaped end plates 93 and 95 and scroll teeth 94 and 96 formed integrally with the end plates 93 and 95, respectively. Such a scroll compression mechanism 90 compresses the refrigerant between the scroll teeth 94 and 96 engaged with each other.
Such a compressor 100 includes the same rotary compression mechanism 3 as described above on the lower stage side and a scroll compression mechanism 90 on the higher stage side, and compresses the refrigerant in two stages.
Also in the compressor 100 having such a configuration, the same effect can be obtained by providing the rotary compression mechanism 3 with the same configuration as described above.

  In addition, the configuration of each part of the compressor can be appropriately performed within the scope of the gist of the present invention, such as a change to a configuration other than the above, addition of another configuration, deletion of a partial configuration, and the like.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Housing 3 Rotary compression mechanism part 4 Drive part 11 Cylinder 12 Cylindrical inner surface 13 Separator 14 Rotor 16 Crankshaft 17 Eccentric shaft part 21 Rotor 22 Stator 23 Rotor core 24 Shaft hole 25 Passage 28 Oil separation plate 30 Stator core 40 End bearing 41 Lower bearing bracket 43 Lower plate portion (plate member)
44 Shaft hole 45 Refrigerant exhaust port 46 Boss part 47 Outer peripheral wall part 48 Groove 49 End plate 49a Lubricating oil flow path 51 Plate 60 Upper bearing bracket 61 Upper plate part (plate member)
61a Upper surface 61b Outer peripheral surface 62 Boss portion 62a Outer peripheral surface 63 Shaft hole 65 Refrigerant exhaust port (exhaust port)
66 Circumferential groove 67 Bolt 69 Refrigerant outlet 70 Muffler cover 70a Outer peripheral part 70b Top (inner peripheral part)
71 Opening 72 Cylindrical part 75 Plate 76 Communication port 77 Gasket 78 Communication port 78a End part 78b End part 78c Bending part 79 Through-hole 80 Mist collection member (collection member)
90 scroll compression mechanism 91 orbiting scroll 92 fixed scroll 100 compressor 101 communication hole M1 lower muffler chamber M2 upper muffler chamber (muffler chamber)

Claims (4)

The housing includes a rotary compression mechanism that compresses gas and a drive unit that drives the rotary compression mechanism,
The rotary compression mechanism is
A cylinder having a cylindrical inner surface;
A crankshaft that passes through the cylinder and is driven to rotate about the center axis of the cylinder by the drive unit, and has an eccentric shaft portion that is eccentric to the center axis of the cylinder in the cylinder;
Plate members that respectively close the openings at both ends of the cylinder;
An exhaust port formed in at least one of the plate members and communicating with the cylinder;
A cylindrical boss provided integrally with the plate member in which the exhaust port is formed, the crankshaft being penetrated and rotatably supporting the crankshaft;
A muffler cover that forms an muffler chamber in which an outer peripheral portion is abutted against the plate member, an inner peripheral portion faces the outer peripheral surface of the boss portion, and refrigerant is discharged from the cylinder through the exhaust port;
A refrigerant delivery port formed between the inner peripheral part of the muffler cover and the outer peripheral surface of the boss part, and for sending the refrigerant from the muffler chamber into the housing;
A collecting member that is provided at the refrigerant delivery port and collects lubricating oil mixed in the refrigerant; and
In the boss portion, a circumferential groove continuous in the circumferential direction of the boss portion is formed at a position facing the inner peripheral portion of the muffler cover,
The compressor having a rotary compression mechanism, wherein the collecting member is disposed in the circumferential groove and is provided between an inner circumferential portion of the muffler cover and an outer circumferential surface of the boss portion.   2. The compressor having a rotary compression mechanism according to claim 1, wherein a communication port that communicates the inside and outside of the muffler chamber is formed between an outer peripheral portion of the muffler cover and the plate member.   3. The rotary compression mechanism according to claim 2, wherein the communication port has a bent portion or a curved portion between an end portion on the inner side of the muffler chamber and an end portion on the outer side of the muffler chamber. Having compressor.   The scroll compression mechanism which has a fixed scroll fixed to the said housing side, and a turning scroll which carries out eccentric turning with respect to the said fixed scroll with the said crankshaft is further provided. A compressor having the rotary compression mechanism according to one item.

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