WO2019076080A1

WO2019076080A1 - Scroll compressor having lubricating structure

Info

Publication number: WO2019076080A1
Application number: PCT/CN2018/093203
Authority: WO
Inventors: 郭华明
Original assignee: 苏州英华特涡旋技术有限公司
Priority date: 2017-10-19
Filing date: 2018-06-27
Publication date: 2019-04-25
Also published as: CN107676261A

Abstract

A scroll compressor having a lubricating structure, comprising: a shell, as well as a moving scroll plate (1), a not-moving scroll plate (2), a main bearing pedestal (6) and a driving assembly which are disposed in the shell. The inner space of the shell is separated by the main bearing pedestal (6) into a space I and a space II which are isolated from each other, a compressor air suction opening (71) is disposed in the space I, and a scroll air suction opening (72) is disposed in the space II; a cavity is formed between a front end surface of the main bearing pedestal (6) that is close to the moving scroll plate (1) and a back surface of the moving scroll plate (1); a bearing hole (61) used for accommodating a main bearing (8) is formed in the main bearing pedestal (6), and a first ventilation groove (91) is formed on the outer side of the bearing hole (61) and/or on the wall thereof; the first ventilation groove (91) extends along the axial direction of the bearing hole (61), and the first ventilation groove (91) communicates with the compressor air suction opening (71); and a second ventilation groove (92) is formed in the cavity wall of the cavity body, and the first ventilation groove (91) communicates with the scroll air suction opening (72) by means of the second ventilation groove (92). By additionally providing the main bearing pedestal in the scroll compressor, high-pressure gas losses are avoided, and the volumetric efficiency of the compressor is increased. The bearing is cooled, the reliability is improved, and the power consumption of the bearing is reduced.

Description

Scroll compressor with lubricating structure

Technical field

The invention relates to a compressor, in particular to a scroll compressor with a lubricating structure.

Background technique

There is an oil pool at the bottom of the vertical scroll compressor. Usually, a centrifugal oil pump is used to deliver the lubricating oil to the bearing for lubrication. For example, the vertical variable frequency scroll compressor disclosed in US Pat. No. 8,107,951 has an oil pool at the bottom, and usually uses a volumetric oil pump to deliver lubricating oil to bearings for lubrication.

The oil-free tank at the bottom of the horizontal scroll compressor is usually shown in US6152713. The lubricating oil in the exhaust chamber is introduced into the back pressure chamber through the circuit, and the bearing is lubricated to increase the oil content in the circuit. Usually, the exhaust port is provided with The oil separator is usually provided with a pressure relief valve in the back pressure chamber to prevent the pressure in the back pressure chamber from being too high. It has the following disadvantages: 1) Refrigerant is contained in the oil return, the mass flow rate of the compressor is lost, and the efficiency of the refrigeration system is lowered. 2) If the pressure is too high, the back pressure chamber will increase the friction loss of the scroll end face.

Summary of the invention

In order to solve the above technical problems, the present invention proposes a scroll compressor with a lubricating structure.

In order to achieve the above object, the technical solution of the present invention is as follows:

A scroll compressor with a lubricating structure, comprising: a casing, an orbiting scroll, a fixed scroll and a drive assembly, a compression chamber formed between the orbiting scroll and the fixed scroll, an orbiting scroll, and a static The scroll and the driving assembly are disposed in the housing, the driving assembly comprises: a stator, a rotor and a crankshaft, the crankshaft is connected with the movable scroll, and further comprises a main bearing seat, the main bearing seat is disposed in the housing, and the main bearing housing is the housing The inner space is divided into a relatively isolated space one and a space second, the compressor suction port is disposed in the space one, and the vortex suction port is disposed in the space two;

The main bearing seat forms a cavity between the front end surface of the movable scroll and the back surface of the movable scroll, and a bearing hole for placing the main bearing is disposed on the main bearing seat, and the main bearing sleeve is disposed outside the crankshaft at the bearing hole a first venting groove is disposed on the outer side and/or the wall of the hole, the first venting groove extends along the axial direction of the bearing hole, and the first venting groove communicates with the suction port of the compressor, and the first venting groove is provided on the cavity wall of the cavity The second venting groove communicates the first venting groove with the vortex suction port.

The invention adds a main bearing seat, and the main bearing seat divides the inner space of the casing into two parts, which are respectively separated space one and space two, so that the vortex suction port and the compressor suction port are separated, leaving only The first venting groove and the second venting groove communicate the compressor suction port and the vortex suction port. When the movable scroll is in operation, the refrigerant enters through the suction port of the compressor, flows through the motor slot and the first venting groove, and the lubricating oil in the refrigerant is also sucked in. The main bearing and the driving bearing are lubricated and cooled, and then The second venting groove enters the vortex suction port.

Compared with the prior art, the present invention has the following beneficial effects: 1) avoiding high pressure gas loss and increasing the volumetric efficiency of the compressor. 2) Cooling the bearing improves reliability and reduces bearing power consumption.

On the basis of the above technical solutions, the following improvements can also be made:

As a preferred solution, a stepped groove is provided on the main bearing housing, and the bearing hole is disposed in the stepped groove.

With the above preferred scheme, the structure is more reasonable.

Preferably, the second venting groove is disposed on the front end surface of the main bearing housing, and the second venting groove extends in the radial direction of the main bearing housing.

With the above preferred scheme, the structure is more reasonable.

As a preferred solution, one or more positioning pins are provided on the main bearing housing, and the fixed scroll is in clearance with the positioning pin.

With the above preferred solution, the installation is more convenient.

Preferably, the housing comprises: a first housing portion and a top cover, the movable scroll, the fixed scroll, the main bearing housing and the driving component are disposed in the first housing portion, and the top surface of the fixed scroll The top cover is floatingly connected.

With the above preferred scheme, the structure is more reasonable.

Preferably, a back pressure chamber is formed between the top surface of the fixed scroll and the top cover, and the back pressure chamber communicates with the compression chamber.

With the above preferred solution, the back pressure chamber pressure presses the fixed scroll toward the orbiting scroll, and the fixed scroll can float along its axial direction.

Preferably, the stator is fixedly disposed on the circumferential inner wall of the first housing portion, the crankshaft is rotatably coupled to both end portions of the first housing portion, and the rotor is sleeved and coupled to the outer surface of the crankshaft, the rotor and The stators are matched to each other.

With the above preferred solution, the installation is more convenient.

As a preferred solution, the orbiting scroll is connected to the main bearing housing via a cross slip ring.

With the above preferred solution, the orbiting scroll is prevented from rotating.

Preferably, the second venting groove is disposed on the back surface of the movable scroll, and the second venting groove extends in the radial direction of the movable scroll.

According to the above preferred solution, the second ventilation groove can also be disposed on the back surface of the movable scroll.

Preferably, the front end surface of the main bearing housing is provided with an annular protrusion that is concentric with the bearing hole, and the second ventilation groove is disposed on the annular protrusion.

With the preferred embodiment described above, the position of the second venting groove is more reasonable.

DRAWINGS

1 is a cross-sectional view of a scroll compressor with a lubricating structure according to an embodiment of the present invention.

2 is a flow chart of a gas circulation when a scroll compressor with a lubricating structure is provided according to an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a main bearing housing according to an embodiment of the present invention.

4 is a top plan view of a main bearing housing according to an embodiment of the present invention.

FIG. 5 is a schematic structural view of an orbiting scroll, a fixed scroll, a drive assembly, and a main bearing housing according to an embodiment of the present invention.

FIG. 6 is a second schematic structural diagram of a main bearing housing according to an embodiment of the present invention.

Figure 7 is a cross-sectional view of a main bearing housing according to an embodiment of the present invention.

FIG. 8 is a cross-sectional view of a first venting groove provided by an embodiment of the present invention.

Among them: movable scroll 1, static scroll 2, stator 3, rotor 4, crankshaft 5, main bearing housing 6, bearing hole 61, stepped groove 62, annular projection 63, positioning pin 64, compressor suction Port 71, scroll inlet 72, main bearing 8, first vent 91, second vent 92, first housing portion 10, top cover 11, cross slip ring 12, drive bearing 13, space one a, Space two b.

Detailed ways

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, in order to achieve the object of the present invention, in some embodiments of a scroll compressor with a lubricating structure, a scroll compressor with a lubricating structure includes: a housing, an orbiting scroll a disk 1, a fixed scroll 2 and a driving assembly, a compression chamber is formed between the orbiting scroll 1 and the fixed scroll 2, and the movable scroll 1, the fixed scroll 2 and the driving assembly are disposed in the housing, and the driving assembly The utility model comprises a stator 3, a rotor 4 and a crankshaft 5. The crankshaft 5 is drivingly connected with the movable scroll 1 and further comprises a main bearing seat 6 which is disposed in the housing. The main bearing seat 6 divides the internal space of the housing into Relatively isolated space one a and space two b, the compressor suction port 71 is disposed in the space one a, the scroll suction port 72 is disposed in the space two b;

The main bearing housing 6 forms a cavity between the front end surface of the movable scroll 1 and the back surface of the movable scroll 1, and the bearing housing 61 for placing the main bearing 8 is disposed on the main bearing housing 6, and the main bearing 8 is sleeved. On the outer side of the crankshaft 5, a first venting groove 91 extending in the axial direction of the bearing hole 61 is provided in the hole wall of the bearing hole 61. The first venting groove 91 communicates with the compressor suction port 71 at the cavity wall of the cavity. A second venting groove 92 is provided, and the second venting groove 92 communicates the first venting groove 91 with the vortex suction port 72.

The present invention adds a main bearing housing 6, which divides the inner space of the housing into two parts, respectively a relatively isolated space a and a space b, so that the vortex suction port 72 and the compressor suction port 71 is isolated, leaving only the first venting groove 91 and the second venting groove 92 to communicate the compressor suction port 71 and the vortex suction port 72. When the movable scroll 1 is in operation, the refrigerant enters, passes through the compressor suction port 71, flows through the motor hole groove, the first ventilation groove 91, and the lubricating oil in the refrigerant is also sucked, the main bearing 8 and the drive bearing 13 Lubricated and cooled, and then enters the vortex suction port through the second venting groove 92.

In order to further optimize the implementation of the present invention, in other embodiments, the remaining features are the same, except that the first venting groove 91 is a venting groove extending along the axial direction of the hole wall of the bearing hole 61. The cross-sectional curve of the first venting groove 91 includes a central arc segment c0, a left curved segment c1 and a right curved segment c2 disposed on opposite sides of the central arc segment c0;

As shown in FIG. 8, the central arc segment c0, the left curve segment c1, and the right curve segment c2 respectively satisfy the following formula;

y=K ₁ *a ₁ ^b1x , K ₁ >0, lna ₁ <0, 0<b ₁ <1, 0<x≤X ₁ , left curve segment c1;

(xa ₂ ) ² +(yb ₂ ) ² =r ² , X1<x≤X2, central arc segment c0;

y=K ₂ *a ₃ ^b3x , K ₂ >0, lna ₃ <0, b ₃ >1, x>X2, right curve segment c2;

With the above preferred solution, the left curve segment c1 and the right curve segment c2 of the first ventilation groove 91 of the present application are respectively changed along the Gombaz (growth) curve, and the slope of the curve is a change dynamic. Taking the left curve segment c1 as an example, the slope of the curve changes from gentle to steep to gentle.

Since the first venting groove 91 is close to the crankshaft 5, the crankshaft 5 drives the orbiting scroll 1 to rotate, and a region with a small pressure is formed around the crankshaft 5, so that the lubricating oil in the refrigerant can better perform the main bearing 8 For cooling, the present application adopts a segmented first venting groove 91. When the lubricating oil is deflected toward the central arc segment c0 by the centrifugal force, the lubricating oil can also flow to the bearing along the left curved section c1 and the right curved section c2. Better cooling is achieved on the walls of the holes 61.

It should be noted that the position of the second ventilation groove 92 corresponds to the position of the first ventilation groove 91. Meanwhile, in order to further optimize the embodiment, the second ventilation groove 92 is adjacent to one end of the first ventilation groove 91 toward the first ventilation groove 91. The position is inclined to form an inclined surface, which facilitates the smooth flow of airflow.

As shown in FIGS. 3 and 4, in order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that the main bearing housing 6 is provided with a stepped groove 62, a bearing hole. 61 is disposed in the stepped groove 62.

With the above preferred scheme, the structure is more reasonable.

In order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that the second ventilation groove 92 is disposed on the front end surface of the main bearing housing 6, and the second ventilation groove 92 is along the main The radial extension of the bearing housing 6.

With the above preferred scheme, the structure is more reasonable.

Further, an annular projection 63 which is concentric with the bearing hole 61 is provided on the front end surface of the main bearing housing 6, and the second ventilation groove 92 is provided on the annular projection 63.

With the preferred embodiment described above, the position of the second venting groove 92 is more reasonable.

In order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that one or more positioning pins 64 are provided on the main bearing housing 6, the fixed scroll 2 and the positioning. Pin 64 clearance fit.

With the above preferred solution, the installation is more convenient.

In order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that the housing includes: the first housing portion 10 and the top cover 11, the movable scroll 1, and the static vortex The rotary disk 2, the main bearing housing 6 and the drive assembly are disposed in the first housing portion 10, and the top surface of the fixed scroll 2 is floatingly coupled to the top cover 11.

With the above preferred scheme, the structure is more reasonable.

Further, a back pressure chamber is formed between the top surface of the fixed scroll 2 and the top cover 11, and the back pressure chamber communicates with the compression chamber.

With the above preferred embodiment, the back pressure chamber pressure presses the fixed scroll 2 toward the orbiting scroll 1, and the fixed scroll 2 can float along its axial direction.

Further, the stator 3 is fixedly disposed on the circumferential inner wall of the first housing portion 10, and the crankshaft 5 is rotatably coupled to both end portions of the first housing portion 10, and the rotor 4 is sleeved and coupled to the outer surface of the crankshaft 5. The rotor 4 is disposed in cooperation with the stator 3.

With the above preferred solution, the installation is more convenient.

As shown in FIG. 5, in order to further optimize the performance of the present invention, in other embodiments, the remaining features are the same, except that the orbiting scroll 1 is coupled to the main bearing housing 6 via a cross slip ring 12.

With the above preferred embodiment, the orbiting scroll 1 is prevented from rotating.

In order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that the second ventilation groove 92 is disposed on the back surface of the orbiting scroll 1 and the second ventilation groove 92 is moved. The radial extent of the scroll 1 is extended.

According to the above preferred solution, the second ventilation groove 92 can also be disposed on the back surface of the orbiting scroll 1.

As shown in FIGS. 6 and 7, in order to further optimize the performance of the present invention, in other embodiments, the remaining features are the same, except that the first venting groove 91 is disposed outside the bearing hole 61.

With the above preferred scheme, airflow is more convenient.

The above is only a preferred embodiment of the present invention, and it should be noted that various modifications and improvements can be made by those skilled in the art without departing from the inventive concept. protected range.

Claims

A scroll compressor with a lubricating structure, comprising: a casing, an orbiting scroll, a fixed scroll, and a drive assembly, wherein the orbiting scroll forms a compression chamber with the fixed scroll, The movable scroll, the fixed scroll and the driving assembly are disposed in the housing, the driving assembly comprises: a stator, a rotor and a crankshaft, and the crankshaft is drivingly connected with the movable scroll, and is characterized The main bearing housing is disposed in the housing, and the main bearing housing divides the internal space of the housing into a relatively isolated space 1 and a space 2, and the compressor suction port is disposed. In the space one, a vortex suction port is disposed in the space two;

a cavity formed between the front end surface of the main scroll and the back surface of the orbiting scroll, and a bearing hole for placing a main bearing on the main bearing housing, the main bearing a bearing sleeve is disposed on an outer side of the crankshaft, and a first ventilation groove is disposed on an outer side of the bearing hole and/or a hole wall thereof, and the first ventilation groove extends along an axial direction of the bearing hole, the first The venting groove is in communication with the compressor suction port, and a second venting groove is disposed on the cavity wall of the cavity, and the second venting groove communicates the first venting groove with the vortex suction port.
The scroll compressor with a lubricating structure according to claim 1, wherein a stepped groove is provided in the main bearing housing, and the bearing hole is disposed in the stepped groove.
The scroll compressor with a lubricating structure according to claim 2, wherein the second venting groove is disposed at a front end surface of the main bearing housing, and the second venting groove is along the main bearing housing Radial extension.
The scroll compressor with a lubricating structure according to claim 3, wherein one or more positioning pins are provided on the main bearing housing, and the fixed scroll is in clearance engagement with the positioning pin.
A scroll compressor with a lubricating structure according to claim 4, wherein said housing comprises: a first housing portion and a top cover, said orbiting scroll, said fixed scroll, said The main bearing housing and the driving assembly are disposed in the first housing portion, and a top surface of the fixed scroll is floatingly connected to the top cover.
A scroll compressor with a lubricating structure according to claim 5, wherein a back pressure chamber is formed between a top surface of the fixed scroll and the top cover, and the back pressure chamber and the compression The cavity is connected.
The scroll compressor with a lubricating structure according to claim 6, wherein the stator is fixedly disposed on a circumferential inner wall of the first housing portion, and the crankshaft is rotatably coupled to the first housing At both ends of the body, the rotor is sleeved and transmitted to the outer surface of the crankshaft, and the rotor is disposed in cooperation with the stator.
A scroll compressor with a lubricating structure according to claim 7, wherein said orbiting scroll is coupled to said main bearing housing via a cross slip ring.
The scroll compressor with a lubricating structure according to any one of claims 1 to 8, wherein the second vent groove is disposed at a rear surface of the orbiting scroll, and the second vent groove The radial extension of the orbiting scroll.
A scroll compressor with a lubricating structure according to claim 9, wherein an annular projection of a center of the bearing bore is provided on a front end surface of the main bearing housing, and the second venting groove is disposed at The annular projection is on.