WO2020057452A1

WO2020057452A1 - Scroll compressor and air-conditioning system comprising same

Info

Publication number: WO2020057452A1
Application number: PCT/CN2019/105866
Authority: WO
Inventors: 杨春; 束宏飞; 曾荡
Original assignee: 艾默生环境优化技术(苏州)有限公司
Priority date: 2018-09-20
Filing date: 2019-09-16
Publication date: 2020-03-26

Abstract

A scroll compressor. The scroll compressor comprises: a housing (10); a compression mechanism (20) comprising a fixed scroll (21) and a movable scroll (22), with a series of compression chambers (23) for compressing a working fluid being formed between the movable scroll (22) and the fixed scroll (21); and a sealing member arranged between the fixed scroll (21) and an inner wall of the housing (10), thereby dividing the housing (10) of the scroll compressor into an upper part and a lower part, wherein a space encircled by the upper part of the housing (10) and the fixed scroll (21) is sealed by the sealing member to form a seal chamber as a flash tank integrated with the scroll compressor; and the seal chamber is in fluid communication with the compression chambers (23).

Description

Scroll compressor and air-conditioning system including the same

This application claims priority from the following Chinese patent applications: Application No. 201811101055.6 filed with the State Intellectual Property Office on September 20, 2018, and the name of the invention "Scroll compressor and air-conditioning system including the scroll compressor" Chinese patent application; Chinese patent application filed with the State Intellectual Property Office on September 20, 2018 with application number 201821544231.9, and the name of the invention is "Scroll compressor and air-conditioning system including the scroll compressor". The entire contents of these patent applications are incorporated herein by reference.

Technical field

The present disclosure relates to a scroll compressor and an air conditioning system including the scroll compressor.

Background technique

The content of this section only provides background information related to the present disclosure, which may not constitute prior art.

Scroll compressor is a compression compressor with positive displacement. During the operation of the scroll compressor, the power of the motor is transmitted to the scroll assembly via the rotation shaft to cause relative rotation of the scroll assembly, thereby achieving compression of the working fluid. The scroll assembly includes a movable scroll and a fixed scroll.

At present, air-jet enthalpy compressors are widely used in scroll compressors. The enthalpy-increasing compressor uses a two-stage throttling intermediate jet technology and a flash evaporator for gas-liquid separation to achieve an enthalpy-increasing effect. It is cooled by jet mixing while compressing at medium and low pressure, and then compressing normally at high pressure to increase the discharge of the compressor to achieve the purpose of increasing the heating capacity in a low temperature environment. The high-efficiency subcooler also plays a key role in the entire system. On the one hand, the working fluid in the main circulation circuit is subcooled before the throttling to increase the enthalpy difference; on the other hand, the auxiliary circuit (this working fluid will be The middle part of the machine is introduced to directly participate in compression), and the low-pressure and low-temperature working fluid after the pressure reduction of the electronic expansion valve is appropriately preheated to reach a suitable intermediate pressure and is provided to the compressor for secondary compression. When the outdoor temperature is very low, the heat exchange capacity of the outdoor unit is reduced, the amount of return air from the normal return port of the compressor is reduced, and the compressor power is reduced, which cannot exert the best effect. However, the refrigerant gas is replenished through the intermediate-pressure return air injection port, thereby increasing the discharge capacity of the compressor, increasing the amount of circulating working fluid heated by the indoor unit heat exchanger, and increasing the heating capacity. Therefore, it is more suitable for cold regions.

The jet enthalpy increasing system can significantly improve the cooling / heating and energy efficiency of the high-pressure specific working condition, and has applications in many applications such as heat pump air conditioning / low temperature heat pump heating (hot water) / low temperature refrigeration. At present, there are two main types of system forms: economizer systems for heat exchangers (such as plate heat exchangers or sleeve heat exchangers) and flash tank systems. Among them, the plate heat exchanger is simple to control and has a wide operating range. However, the flash tank system has a greater cost advantage than the economizer system: the flash tank is only a pressure vessel, and the cost of the plate heat exchanger is much higher. Although the flash tank system has cost advantages, the flash tank and the compressor are two components. The connection of the system requires piping, which increases the cost. At the same time, the pressure drop in the piping will also affect the performance of the system.

Therefore, there is a need for a scroll compressor that simplifies system connection, reduces costs, and improves scroll compressor performance.

Summary of the Invention

An object of the present disclosure is to provide a scroll compressor, including: a casing; a compression mechanism including a fixed scroll and a movable scroll; and a compression mechanism is formed between the movable scroll and the fixed scroll for compression. A series of compression chambers for the working fluid; and a sealing member disposed between the fixed scroll and the inner wall of the casing, thereby dividing the casing of the scroll compressor into an upper portion and a lower portion, and the upper portion of the casing and The space surrounded by the fixed scroll is sealed by a sealing member to form a sealed cavity. As a flash tank integrated with the scroll compressor, the sealed cavity is in fluid communication with the compression cavity.

In one embodiment, the working fluid forms a liquid surface in the sealed cavity, and an injection tube is provided in the sealed cavity. The upper end of the injection tube is above the liquid level, and the lower end of the injection tube is attached to the fixed scroll and passes through the fixed scroll. A fluid passage provided in the fixed scroll leads to the compression chamber.

In one embodiment, the sealing member includes an O-ring disposed between the outer periphery of the fixed scroll and the inner wall of the housing.

In one embodiment, the compressed working fluid in the compression chamber is discharged from a scroll exhaust port provided in the fixed scroll member through a fluid passage provided in the fixed scroll member below the sealing member.

In one embodiment, a fluid circulation groove is formed on the upper surface of the fixed scroll, and an exhaust cover plate is provided on the fluid circulation groove. The exhaust cover plate and the fluid circulation groove form a sealed fluid discharge. A passage through which the compressed working fluid in the compression chamber is discharged below the sealing member through the fluid discharge passage.

In one embodiment, the spray tube is a copper tube.

In one embodiment, the working fluid is discharged from a compressor exhaust port provided at a lower portion of the casing below the movable scroll.

In one embodiment, the working fluid is guided through a fluid passage provided in the fixed scroll to a driving mechanism provided in the scroll compressor for cooling.

In one embodiment, a compressor suction port is provided at a lower portion of the casing, and the compressor suction port passes through the side wall of the casing to the compression chamber.

In one embodiment, a compressor exhaust port is provided at a lower portion of the housing.

In one embodiment, a flash tank inlet is provided at an upper portion of the housing.

In one embodiment, a flash tank discharge port is provided at an upper portion of the housing, and the flash tank discharge port is axially lower than the flash tank inlet.

An air conditioning system including the above-mentioned scroll compressor. The air conditioning system further includes an evaporator. The inlet of the evaporator is connected to a discharge port of a flash tank provided in an upper part of the scroll compressor via a control valve. The outlet is connected to the compressor suction port provided in the lower part of the scroll compressor, so that the working fluid discharged from the sealed cavity through the flash tank discharge port is evaporated at the evaporator, and then the working fluid is sucked through the compressor The air port is introduced into the sealed cavity of the scroll compressor; and a condenser, the inlet of the condenser is connected to the compressor exhaust port provided in the lower part of the scroll compressor, and the outlet of the condenser is connected to the The flash tank inlet of the upper part of the scroll compressor, so that the working fluid discharged from the scroll compressor through the compressor exhaust port is condensed at the condenser, and then the working fluid is introduced into the scroll compression through the flash tank inlet Machine's sealed cavity.

Through the integrated design of the flash tank and the compressor, the present disclosure simplifies the system connection mode and reduces the cost. At the same time, it has the effects of the low pressure drop of the injection pipeline and the cooling of the compression mechanism, and improves the system efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present disclosure will be described below by way of example only with reference to the accompanying drawings, in which the same features or components are denoted by the same reference numerals and the drawings are not necessarily drawn to scale, and in the drawings:

1 is a top view of a scroll compressor according to the prior art;

2 is a sectional view of a scroll compressor according to the related art, taken along a line A-A in FIG. 1;

3 is a schematic diagram of an air conditioning system separately provided with a flash tank according to the prior art;

4 is a top view of a scroll compressor according to an embodiment of the present disclosure;

5 is a partial cross-sectional view of a scroll compressor according to an embodiment of the present disclosure, taken along a line BB in FIG. 4, showing positions of a compressor suction port and a flash tank inlet, and a flow direction of a working fluid ;

6 is a partial cross-sectional view of a scroll compressor according to another embodiment of the present disclosure, taken along the line B-B in FIG. 4, showing another flow direction of the working fluid;

7 is a partial cross-sectional view of a scroll compressor according to an embodiment of the present disclosure, taken along a line C-C in FIG. 4, showing the attachment of a spray pipe to a fixed scroll;

8 is a schematic diagram of an air conditioning system including a scroll compressor integrated with a flash tank according to an embodiment of the present disclosure; and

9 is a partial cross-sectional view of another embodiment of a fixed scroll of a scroll compressor according to an embodiment of the present disclosure, taken along a line B-B in FIG. 4.

detailed description

The following description is merely exemplary in nature and is not intended to limit the present disclosure, applications, and uses. It should be understood that in all of these figures, similar reference numbers indicate the same or similar parts and features. Each drawing merely schematically illustrates the concept and principle of an embodiment of the present disclosure, and does not necessarily show the specific size and proportion of each embodiment of the present disclosure. It may be adopted in a specific drawing or a specific part of the drawing Exaggerated ways to illustrate relevant details or structures of various embodiments of the present disclosure.

FIG. 1 is a plan view of a scroll compressor 100 not integrated with a flash tank according to the related art. FIG. 2 is a sectional view of a scroll compressor according to the related art, taken along a line A-A in FIG. 1. FIG. FIG. 3 is a schematic diagram of a connection state of the compressor 100 in an air conditioning system. The scroll compressor 100 includes a casing 10, a compression mechanism 20, a driving mechanism 30, and the like housed in the casing 10. The casing 10 includes a substantially cylindrical main casing 11, a top cover 12, and a base 13. The compression mechanism 20 is a scroll assembly, and includes a fixed scroll 21 and a movable scroll 22. A series of compression chambers 23 are formed between the fixed scroll 21 and the movable scroll 22. The compression mechanism 20 is supported on the main bearing block 50. The drive mechanism 30 includes, for example, a motor, and the motor includes a stator 31 and a rotor 32. The rotor 32 is provided in the stator 31 and is rotatable relative to the stator 31. The driving mechanism 30 drives the compression mechanism 20 via the rotation shaft 33. The rotation shaft 33 is provided in the rotor 32 and rotates together with the rotor 32. The upper end portion of the rotation shaft 33 is supported by the main bearing housing 50 via a bearing 51.

Referring to FIG. 2, a compressor suction port 41 is provided on the top cover 12. The upper end of the compressor suction port 41 projects to the outside of the compressor 100. The lower end of the compressor suction port 41 is attached to the fixed scroll 21 and is in fluid communication with the compression chamber 23. The gaseous working fluid from the evaporator enters the compression chamber 23 through the compressor suction port 41, is compressed in the compression chamber, and enters the fixed scroll 21 and the scroll exhaust port 42 provided in the fixed scroll. The chamber between the top covers 12. The gaseous working fluid flows down the inner wall of the top cover 12 and the main housing 11 through the fixed scroll 21, the movable scroll 22, and the main bearing housing 50, and is disposed in the main housing 11 and located in the main bearing housing 50. The compressor exhaust port 44 below and above the drive mechanism 30 discharges the compressor 100.

Referring to FIG. 3, the gaseous working fluid discharged through the compressor exhaust port 44 is condensed at a condenser, and is converted into a liquid working fluid. The liquid working fluid flows into the flash tank from the flash tank inlet 81 via a control valve. After the high-pressure saturated liquid working fluid enters a relatively low-pressure flash tank, the saturated liquid working fluid becomes a part of the saturated gaseous working fluid and the saturated liquid working fluid under the pressure of the container due to the sudden decrease in pressure. The saturated liquid working fluid at a lower pressure exits from the flash tank discharge port 82, enters the evaporator via the control valve, and then evaporates in the evaporator to a gaseous working fluid, then leaves the evaporator and enters the compressor suction port 41. The saturated gaseous working fluid at a lower pressure leaves the flash tank exhaust port 83 and enters the compressor 100 through an injection enthalpy interface 43 provided on the upper portion of the main casing 11.

Referring again to FIG. 2, the spray enthalpy interface 43 is attached to the fixed scroll 21 through the main casing 11, and is in fluid communication with a fluid passage formed in the fixed scroll 21. This fluid channel leads to the compression chamber 23. The saturated gaseous working fluid from the flash tank enters the compression chamber 23 through the fluid passage in the enthalpy interface 43 and the fixed scroll 21, and then enters between the fixed scroll 21 and the top cover 12 through the scroll exhaust port 42. Chamber. The gaseous working fluid flows down the inner wall of the top cover 12 and the main casing 11 through the fixed scroll 21, the movable scroll 22, and the main bearing seat 50, and is then discharged from the compressor 100 through the compressor exhaust port 44.

FIG. 4 is a top view of a scroll compressor according to an embodiment of the present disclosure. 5 and 6 are partial cross-sectional views of a scroll compressor according to an embodiment of the present disclosure, taken along a line B-B in FIG. 4. 7 is a partial cross-sectional view of a scroll compressor according to an embodiment of the present disclosure, taken along a line C-C in FIG. 4. 8 is a schematic diagram of an air conditioning system including a scroll compressor integrated with a flash tank according to an embodiment of the present disclosure. 9 is a partial cross-sectional view of another embodiment of a fixed scroll of a scroll compressor according to an embodiment of the present disclosure, taken along a line B-B in FIG. 4.

A sealing member is provided between the outer periphery of the fixed scroll 21 and the inner wall of the casing 10. The sealing member includes an O-ring 61. The sealing member divides the casing 10 of the scroll compressor into an upper portion and a lower portion. The space enclosed by the upper part of the casing 10 and the fixed scroll 21 is sealed by a sealing member to form a sealed cavity with a certain volume as a flash tank integrated with the scroll compressor.

The compressor suction port 41 is provided at a lower portion of the casing 10, and the compressor suction port 41 is in fluid communication with the compression chamber 23 through a side wall of the casing 10. The gaseous working fluid from the evaporator enters the compression chamber 23 through the compressor suction port 41. A fluid circulation groove is formed on the upper surface of the fixed scroll 21, and an exhaust cover 71 is provided on the fluid circulation groove. The exhaust cover 71 and the fluid circulation groove form a sealed fluid discharge channel. The compressed working fluid in the compression chamber 23 is discharged below the sealing member through the fluid discharge passage. The gaseous working fluid flows through the fixed scroll 21, the movable scroll 22, and the main bearing block 50 along the flow channel provided in the fixed scroll 21, and then along the inner wall of the main casing 11, and passes through the A compressor exhaust port 44 in the main housing 11 and below the main bearing housing 50 and above the drive mechanism 30 discharges the compressor 100. The scroll compressor may be designed to discharge air under the movable scroll. Alternatively, referring to FIG. 6, the airflow may be cooled to the driving mechanism 30 through a fixed scroll sealed channel.

Alternatively, the fluid discharge passage may be provided in the fixed scroll 21 only by drilling. 9, FIG. 9 is a partial cross-sectional view of another embodiment of a fixed scroll of a scroll compressor according to an embodiment of the present disclosure, taken along a line B-B in FIG. 4. The scroll exhaust port 42 does not open from the compression chamber 23 to the outside of the fixed scroll 21 and communicates with a blind hole in the radial direction of the compressor via the longitudinal direction provided in the fixed scroll 21 The other blind hole of the open to the outside of the fixed scroll 21 forms a fluid discharge port on the fixed scroll 21. The fluid discharge port is located below the sealing member.

Referring to FIG. 8, the gaseous working fluid discharged through the compressor exhaust port 44 is condensed at a condenser, and is converted into a liquid working fluid. The liquid working fluid flows into the above-mentioned sealed cavity via the control valve from the flash tank inlet 81 of the integrated flash tank located at the upper portion of the casing 10. After the high-pressure saturated liquid working fluid enters a relatively low-pressure sealed cavity, these saturated liquid working fluids become a part of the saturated gaseous working fluid and the saturated liquid working fluid under the pressure of the container due to the sudden decrease in pressure. The saturated liquid working fluid at a lower pressure exits from the flash tank discharge port 82 of the integrated flash tank located at the upper portion of the casing 10, enters the evaporator through the control valve, and then evaporates in the evaporator to The gaseous working fluid then leaves the evaporator and enters the compressor suction port 41. The flash tank discharge port 82 is axially lower than the flash tank inlet 81.

The saturated liquid working fluid in the sealed cavity can cool the fixed scroll 21.

Referring to FIG. 7, a spray pipe 84 is provided in the sealed cavity. The spray pipe 84 may be made of a variety of materials, which preferably include, for example, copper, iron, and the like. The upper end of the injection pipe 84 is located above the liquid level of the working fluid, and the lower end is attached to the fixed scroll 21 and is in fluid communication with a fluid passage provided in the fixed scroll 21. The saturated gaseous working fluid at a lower pressure is located above the working fluid level in the figure, enters the compression chamber 23 through the injection pipe 84 and the fluid channel provided in the fixed scroll 21, and then enters through the scroll exhaust port 42 A cavity between the fixed scroll 21 and the exhaust cover 71. The gaseous working fluid flows through the fixed scroll 21, the movable scroll 22, and the main bearing block 50 along the flow channel provided in the fixed scroll 21, and then along the inner wall of the main casing 11, and passes through the A compressor exhaust port 44 in the main housing 11 and below the main bearing housing 50 and above the drive mechanism 30 discharges the compressor 100. The compressor may be designed to discharge under the movable scroll, that is, the working fluid is discharged from the compressor exhaust port 44 provided at the lower portion of the casing 10 below the movable scroll 22. Alternatively, referring to FIG. 6, the working fluid is guided through a fluid passage provided in the fixed scroll 21 to a drive mechanism 30 provided in the scroll compressor for cooling.

The integrated design of the scroll compressor and the flash tank can simplify the system pipeline connection and reduce the application cost. Simplifying the piping connection reduces the system piping pressure drop and improves performance. At the same time, the compressor scroll mechanism is immersed in a medium-pressure low-temperature working fluid, achieving an effect similar to isothermal compression and reducing compression power.

Herein, the exemplary embodiments of the present disclosure have been described in detail, but it should be understood that the present disclosure is not limited to the specific embodiments described and illustrated in detail above. Those skilled in the art can make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. All of these variations and modifications fall within the scope of the disclosure. Moreover, all components described herein may be replaced by other technically equivalent components.

Claims

A scroll compressor includes:

Shell (10);

A compression mechanism (20), the compression mechanism (20) includes a fixed scroll (21) and a movable scroll (22), and the movable scroll (22) and the fixed scroll (21) Forming a series of compression chambers (23) between them for compressing the working fluid; and

A sealing member provided between the fixed scroll (21) and an inner wall of the casing (10), thereby dividing the casing (10) of the scroll compressor into an upper portion Part and lower part, a space enclosed by the upper part of the casing (10) and the fixed scroll (21) is sealed by the sealing member to form a sealed cavity as an integral part with the scroll compressor In a flash tank, the sealed cavity is in fluid communication with the compression cavity (23).
The scroll compressor according to claim 1, wherein the working fluid forms a liquid surface in the sealed cavity, and an injection pipe (84) is provided in the sealed cavity (84). The upper end of 84) is located above the liquid surface, and the lower end of the spray tube (84) is attached to the fixed scroll (21) and communicates through a fluid channel provided in the fixed scroll (21). Towards the compression chamber (23).
The scroll compressor according to claim 1, wherein the sealing member includes an O-ring (61) provided between an outer periphery of the fixed scroll (21) and an inner wall of the housing (10). .
The scroll compressor according to claim 1, wherein the compressed working fluid in the compression chamber (23) is removed from a scroll exhaust port (42) provided in the fixed scroll (21). It is discharged below the sealing member through a fluid passage provided in the fixed scroll (21).
The scroll compressor according to claim 1, wherein a fluid circulation groove is formed on an upper surface of the fixed scroll (21), and an exhaust cover (71) is provided on the fluid circulation groove. ), The exhaust cover plate (71) and the fluid circulation groove form a sealed fluid discharge channel, and the compressed working fluid in the compression chamber (23) is discharged to the sealing member through the fluid discharge channel Below.
The scroll compressor according to claim 1, wherein the working fluid is exhausted from the compressor provided at the lower portion of the casing (10) under the movable scroll (22). The mouth (44) is discharged.
The scroll compressor according to claim 1, wherein the working fluid is guided to a drive mechanism provided in the scroll compressor through a fluid passage provided in the fixed scroll (21). cool down.
The scroll compressor according to claim 1, wherein a compressor suction port (41) is provided at the lower portion of the casing (10), and the compressor suction port (41) penetrates The side wall of the casing (10) leads to the compression cavity (23).
The scroll compressor according to claim 8, wherein a compressor exhaust port (44) is provided at the lower portion of the casing (10).
The scroll compressor according to claim 9, wherein a flash tank inlet (81) is provided at the upper portion of the casing (10).
The scroll compressor according to claim 10, wherein a flash tank drain port (82) is provided at the upper portion of the casing (10), and the flash tank drain port (82) ) Is lower axially than the flash tank inlet (81).
An air conditioning system comprising a scroll compressor according to any one of claims 1-11, the air conditioning system further comprising:

An evaporator, the inlet of which is connected to a flash tank discharge port (82) provided in the upper part of the scroll compressor via a control valve, and the outlet of the evaporator is connected to the A compressor suction port (41) of the lower portion of the scroll compressor, so that the working fluid discharged from the sealed cavity through the flash tank discharge port (82) is evaporated at the evaporator , And subsequently introducing working fluid into the sealed cavity (23) of the scroll compressor through the compressor suction port (41); and

A condenser having an inlet connected to a compressor exhaust port (44) provided in the lower portion of the scroll compressor, and an outlet of the condenser connected to another The flash tank inlet (81) of the upper part of the scroll compressor, so that the working fluid discharged from the scroll compressor through the compressor exhaust port (44) is performed at the condenser Condensation is followed by the introduction of working fluid into the sealed cavity of the scroll compressor via the flash tank inlet (81).