A rotary compressor and refrigeration system

Abstract

The present invention provides a rotary compressor and refrigeration system, including a shell, a drive motor and a compression mechanism; the compressor chamber is divided into a first working chamber and a second working chamber; the cylinder body in the first working chamber is provided with an air suction hole, and the cylinder body in the second working chamber is provided with a liquid suction hole and an exhaust cutout, the air suction hole and the liquid suction hole penetrate the side wall of the cylinder body along the radial direction of the cylinder body, when the piston is driven to rotate eccentrically along the first rotation direction, the liquid suction hole is closed, and the refrigerant is introduced into the first working chamber from the air suction hole and discharged from the exhaust cutout; when the piston is driven to rotate eccentrically along the second rotation direction, the refrigerant is introduced into the second working chamber from the liquid suction hole and discharged from the air suction hole, and the first rotation direction is opposite to the second rotation direction. The present invention has both compression and fluorine pump functions, which can greatly reduce costs and improve system energy efficiency.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration systems, and in particular to a rotary compressor capable of rotating forward or reversely and a refrigeration system having the same. Background Art

[0002] At present, the commonly used refrigeration system in the computer room is equipped with a compressor and a fluorine pump at the same time. The refrigeration system selects the compressor circulation mode or the fluorine pump circulation mode according to the indoor and outdoor temperatures. In winter or transition seasons when the outdoor temperature is low, the refrigerant pump (fluorine pump) is used to circulate the refrigerant outdoors for heat exchange, making full use of the outdoor natural cold source; in summer or transition seasons when the outdoor temperature is high, the compressor is used to compress the refrigerant for heat exchange; this intelligent dual-circulation design can avoid turning on the compressor for refrigeration during a certain period of time throughout the year, greatly reducing the energy consumption of the air conditioner, and is also called an intelligent dual-circulation fluorine pump energy-saving air conditioner. But it is obvious that this type of equipment is expensive and has weak competitiveness in areas with high cost requirements, such as household air conditioning. Summary of the invention

[0003] In view of the problems in the prior art, the object of the present invention is to provide a rotary compressor having both compression and fluorine pump functions and a refrigeration system having the same.

[0004] According to one aspect of the present invention, a rotary compressor is provided, comprising a housing, a driving motor and a compression mechanism; the compression mechanism comprises a cylinder body, an upper cylinder head, a lower cylinder head, a piston and a sliding vane, the cylinder body is provided with a through hole, the upper cylinder head and the lower cylinder head are arranged at both ends of the through hole to form a chamber, the piston is arranged in the chamber, a sliding vane groove is provided on the cylinder body, the sliding vane is located in the sliding vane groove and can reciprocate along the sliding vane groove, the sliding vane is stopped on the piston at one end facing the piston, and the chamber is divided into a first working chamber and a second working chamber;

[0005] An air suction hole is provided on the cylinder body in the first working chamber, and a liquid suction hole and an exhaust cutout are provided on the cylinder body in the second working chamber. The air suction hole and the liquid suction hole penetrate the side wall of the cylinder body along the radial direction of the cylinder body. When the piston is driven to rotate eccentrically along the first rotation direction, the liquid suction hole is closed, and the refrigerant is introduced into the first working chamber from the air suction hole and discharged from the exhaust cutout; when the piston is driven to rotate eccentrically along the second rotation direction, the refrigerant is introduced into the second working chamber from the liquid suction hole and discharged from the air suction hole. The first rotation direction is opposite to the second rotation direction.

[0006] Preferably, a liquid suction valve is provided between the liquid suction hole and the chamber, and the liquid suction valve controls the connection and disconnection between the liquid suction hole and the chamber.

[0007] Preferably, the liquid suction valve is a one-way valve, which controls the flow of liquid only from outside the chamber to inside the chamber.

[0008] Preferably, the liquid suction valve comprises a valve plate, and the valve plate is arranged at an opening of the liquid suction hole facing the chamber.

[0009] Preferably, the opening of the liquid suction hole is opened in the exhaust cutout, and the valve sheet is located in the exhaust cutout and covers the opening of the liquid suction hole.

[0010] Preferably, the exhaust cutout is at least partially configured as a plane, which is matched and closely fits with the valve sheet.

[0011] Preferably, the valve plate is fixed to the exhaust cutout by welding.

[0012] Preferably, the diameter of the liquid suction hole is 0.5-3 mm.

[0013] Preferably, the angle between the suction hole and the slide groove is between 0 and 15 degrees.

[0014] According to another aspect of the present invention, a refrigeration system is provided: comprising an outdoor heat exchanger, an indoor heat exchanger and the above-mentioned rotary compressor, wherein the rotary compressor also comprises an exhaust pipe, one end of the indoor heat exchanger is connected to the air suction hole, the other end of the indoor heat exchanger is connected to the outdoor heat exchanger, the outdoor heat exchanger is respectively connected to the exhaust pipe and the suction hole, a first control valve is arranged between the outdoor heat exchanger and the suction hole, and when the piston of the rotary compressor is driven to rotate eccentrically along the first rotation direction, the first control valve cuts off the connection between the outdoor heat exchanger and the suction hole. The holes are connected, and the refrigerant enters the rotary compressor through the suction hole, is discharged from the exhaust cutout, and passes through the outdoor heat exchanger and the indoor heat exchanger in sequence, and then enters the rotary compressor through the suction hole for circulation; when the piston of the rotary compressor is driven to rotate eccentrically along the second rotation direction, the first control valve conducts the connection between the outdoor heat exchanger and the suction hole, and the refrigerant enters the rotary compressor through the suction hole, is discharged from the suction hole, and passes through the indoor heat exchanger and the outdoor heat exchanger in sequence, and then enters the rotary compressor through the suction hole for circulation.

[0015] Preferably, the indoor heat exchanger is also connected to the suction hole, and a second control valve is arranged between the two. When the piston of the rotary compressor is driven to rotate eccentrically along the first rotation direction, the second control valve opens the connection between the indoor heat exchanger and the suction hole; when the piston of the rotary compressor is driven to rotate eccentrically along the second rotation direction, the second control valve cuts off the connection between the indoor heat exchanger and the suction hole.

[0016] Preferably, a third control valve is arranged between the outdoor heat exchanger and the exhaust pipe, and when the piston of the rotary compressor is driven to rotate eccentrically along a first rotation direction, the third control valve opens the connection between the outdoor heat exchanger and the exhaust pipe; when the piston of the rotary compressor is driven to rotate eccentrically along a second rotation direction, the third control valve cuts off the connection between the outdoor heat exchanger and the exhaust pipe.

[0017] A rotary compressor and a refrigeration system having the same of the present invention have both compression and fluorine pump functions, which can greatly reduce costs and improve system energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0019] Figure 1 is a schematic structural diagram of a rotary compressor of the present invention;

[0020] Figure 2 It is a schematic structural diagram of a liquid suction valve of a rotary compressor of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the liquid suction channel of the rotary compressor of the present invention;

[0022] Figure 4 It is a schematic diagram of the compression cycle mode structure of the refrigeration system of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the fluorine pump circulation mode of the refrigeration system of the present invention.

[0024] Reference numerals

[0025] 1 Cylinder

[0026] 2 Air intake holes

[0027] 3 Exhaust cutout

[0028] 4 suction port

[0029] 5 Suction valve

[0030] 6 Rotary compressor

[0031] 7 Outdoor heat exchanger

[0032] 8 Throttling device

[0033] 9 Indoor heat exchanger

[0034] 10 Third control valve

[0035] 11 Second control valve

[0036] 12. First control valve DETAILED DESCRIPTION

[0037] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0038] like Figure 1 As shown in , in an embodiment of the present invention, a rotary compressor and a refrigeration system having the same are provided.

[0039] The rotary compressor includes a housing, a drive motor and a compression mechanism.

[0040] The compression mechanism comprises a cylinder body 1, an upper cylinder cover, a lower cylinder cover, a piston and a sliding vane.

[0041] The cylinder body 1 is provided with a through hole, and an upper cylinder cover and a lower cylinder cover are arranged at two ends of the through hole to form a chamber.

[0042] The piston is placed in the chamber, a vane groove is provided on the cylinder body 1, the vane is located in the vane groove and can reciprocate along the vane groove, and one end of the vane facing the piston abuts against the piston, dividing the chamber into a first working chamber and a second working chamber.

[0043] An air suction hole 2 is provided on the cylinder body 1 in the first working chamber, and a liquid suction hole 4 and an exhaust cutout 3 are provided on the cylinder body in the second working chamber.

[0044] When the piston is driven to rotate eccentrically along the first rotation direction, the liquid suction hole 4 is closed. The refrigerant is introduced into the first working chamber from the air suction hole 2 and discharged from the exhaust cutout 3.

[0045] When the piston is driven to rotate eccentrically along the second rotation direction, the refrigerant is introduced into the second working chamber from the liquid suction hole 4 and discharged from the air suction hole 2.

[0046] In this embodiment, the first rotation direction is as follows Figure 1 The second rotation direction is counterclockwise as shown by the middle arrow, and is opposite to the first rotation direction, which can be understood as a clockwise direction in this embodiment. In this embodiment, the first rotation direction is achieved by rotating the rotor of the driving motor of the rotary compressor in the forward direction, which in turn drives the crankshaft to rotate in the forward direction, and the eccentric part of the crankshaft drives the piston to rotate in the forward direction in the compressor chamber. On the contrary, the driving motor rotor rotates in the reverse direction, which drives the crankshaft to rotate in the reverse direction, and the eccentric part of the crankshaft drives the piston to rotate in the reverse direction in the compressor chamber. The "forward" and "reverse" are relative directions.

[0047] The first rotation direction is the normal compression working mode of the compressor. When the outdoor temperature is high, the compressor can rotate forward in the normal compression working mode. The second rotation direction is the reverse rotation mode of the compressor. At this time, the compressor has a fluorine pump function, that is, the compressor is used as a refrigerant pump (fluorine pump) to circulate the refrigerant outdoors for heat exchange, making full use of the outdoor natural cold source.

[0048] The embodiment of the present invention adds a separate liquid suction hole in the compression chamber of the compressor, so that the compressor can have both compression and fluorine pump functions through forward and reverse rotation. For the system that currently uses both fluorine pump and compressor, the cost can be reduced; at the same time, the function of the compressor is further increased. For customers who like to turn on the air conditioner all night, especially customers in areas with large temperature differences between day and night (who are unwilling to open windows and have more indoor heat sources), the power of the air-conditioning system can be greatly reduced, thereby improving the energy efficiency of the system.

[0049] Taking the commonly used 1.5Hp R32 refrigerant air conditioning system in China as an example, after a preliminary simple estimate (some people are used to turning on the air conditioner all night), when the outdoor temperature is lower than 25℃ and the indoor temperature is 27℃, assuming that the compressor / fluorine pump displacement is 10CC, the estimated fluorine pump frequency is about 1Hz. In other words, when the outdoor temperature is high, the compressor can rotate forward at a normal frequency (e.g. 8-120Hz), and when the outdoor temperature is low and the air conditioner continues the refrigeration cycle, the more energy-efficient fluorine pump mode can be selected for circulation, and the compressor rotates in the reverse direction at a low speed (0.1-10Hz).

[0050] like Figure 1 , 2 As shown in FIG. 3 , in the embodiment of the present invention, a liquid suction valve 5 is preferably provided on the opening of the liquid suction hole 4 facing the chamber side, so that the liquid suction hole 4 can be conveniently opened and closed by the liquid suction valve 5 .

[0051] It is also preferred that the suction valve 5 is a one-way valve, which can only conduct from outside the chamber to inside the chamber, and use the pressure difference between the suction hole 3 and the chamber to prevent the suction hole 4 from opening during the forward cycle of the compressor (compression operation mode), thereby affecting the energy efficiency of the compressor. Optionally, the suction valve 5 adopts a reed valve, such as Figure 2 shown.

[0052] The suction hole 4 should be arranged close to the slide groove, and the angle between the suction hole 4 and the slide groove is preferably controlled between 0 and 15 degrees.

[0053] Another example Figure 1 , 2 As shown in Figures 1 and 3, in the embodiment of the present invention, the valve plate of the liquid suction valve 5 is preferably located in the exhaust cutout 3 and covers the opening of the liquid suction hole 4. The exhaust cutout 3 is preferably at least partially configured as a plane, and the valve plate is fixed to the exhaust cutout 3 by welding. Optionally, the valve plate is fixedly installed by laser welding.

[0054] Compared with the conventional rolling rotor compressor cylinder, the embodiment of the present invention adds a suction hole 4 at the cylinder exhaust cutout 3. The suction valve 5 of the one-way valve is used to control the direction from the suction hole 4 to the chamber to be disconnected when the compressor is in a forward cycle, and to connect the direction from the suction hole 4 to the chamber when the compressor is in a reverse cycle. That is, when the compressor is operating in a normal compression mode, the piston rotates forward in the first rotation direction, the pressure in the compressor chamber is high, and the pressure outside the chamber is low, but because the suction valve 5 is a one-way valve, the suction hole 4 is closed at this time. When the compressor is operating in a fluorine pump mode, the piston rotates in the opposite direction at a low speed in the second rotation direction, the pressure in the compressor chamber is low, and the pressure outside the chamber is high, at this time the suction valve 5 is open and the suction hole 4 is open.

[0055] In addition, if Figure 1 As shown in the embodiment of the present invention, considering that the liquid circulation flow rate is slow in the fluorine pump mode, the diameter of the liquid suction hole 4 can be appropriately reduced. The diameter of the liquid suction hole 4 is 0.5-3mm, preferably 0.8-1.5mm.

[0056] like Figure 4 and Figure 5 As shown in, in an embodiment of the present invention, a refrigeration system includes a rotary compressor 6, an outdoor heat exchanger 7, a throttling device 8, and an indoor heat exchanger 9. The rotary compressor 6 also includes a liquid reservoir and an exhaust pipe. The first end of the indoor heat exchanger 9 is respectively connected to the air inlet 2 and the liquid suction hole 4 of the liquid reservoir, the second end of the indoor heat exchanger 9 is connected to the first end of the throttling device 8, the first end of the outdoor heat exchanger 7 is connected to the second end of the throttling device 8, and the second end of the outdoor heat exchanger 7 is respectively connected to the exhaust pipe and the liquid suction hole 4. A first control valve 12 is provided between the second end of the outdoor heat exchanger 7 and the liquid suction hole 4, and a second control valve 11 is provided between the first end of the indoor heat exchanger 9 and the liquid suction hole 4. As shown in FIG. Figure 4 As shown in the figure, when the piston of the rotary compressor 6 is driven to rotate eccentrically along the first rotation direction, the first control valve 12 is closed and the second control valve 11 is opened, and the gas-liquid mixture entering the liquid reservoir is separated from the gas and liquid and enters the rotary compressor 6 through the suction hole 2. After rotational compression, it becomes a high-temperature and high-pressure gas and is discharged from the cylinder through the exhaust incision 3 to enter the compressor housing. After that, it is discharged from the exhaust pipe and passes through the outdoor heat exchanger 7, the throttling device 8, and the indoor heat exchanger 9 in turn for heat exchange, and finally enters the liquid reservoir again for circulation. At this time, the pressure in the suction hole 4 is connected with the inlet of the liquid reservoir, and the pressure is less than the pressure near the exhaust incision 3 in the chamber. The pressure difference causes the one-way valve to close, and the compressor performs the conventional compressor circulation mode.

[0057] like Figure 5As shown in the figure, when the piston of the rotary compressor 6 is driven to rotate eccentrically along the second rotation direction, the first control valve 12 is opened and the second control valve 11 is closed. When the pressure in the suction hole 4 gradually increases and finally exceeds the pressure in the compressor chamber, the pressure difference causes the one-way valve to open, and the refrigerant enters the compressor chamber from the suction hole 4. As the piston rotates, it is driven to the suction hole 2 and then discharged into the liquid reservoir through the suction hole 2. It is then discharged through the intake pipe of the liquid reservoir, and is successively heat-exchanged through the indoor heat exchanger 9 and the outdoor heat exchanger 7, and then enters the suction hole 4 again for circulation. At this time, the compressor performs the fluorine pump circulation mode.

[0058] Preferably, a third control valve 10 is provided between the second end of the outdoor heat exchanger 7 and the exhaust pipe. When the piston of the rotary compressor 6 is driven to rotate eccentrically along the first rotation direction, the third control valve 10 opens the connection between the outdoor heat exchanger 7 and the exhaust pipe; when the piston of the rotary compressor 6 is driven to rotate eccentrically along the second rotation direction, the third control valve 10 cuts off the connection between the outdoor heat exchanger 7 and the exhaust pipe, which can help to quickly establish a high pressure in the suction hole 4, forming a pressure difference with the compressor chamber, thereby opening the suction valve 5.

[0059] In summary, the rotary compressor and the refrigeration system having the same according to the embodiments of the present invention enable the compressor to have both compression and fluorine pump functions.

[0060] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A rotary compressor, characterized in that: The invention comprises a housing, a driving motor and a compression mechanism; the compression mechanism comprises a cylinder body (1), an upper cylinder head, a lower cylinder head, a piston and a sliding vane; the cylinder body (1) is provided with a through hole; the upper cylinder head and the lower cylinder head are arranged at two ends of the through hole to form a chamber; the piston is arranged in the chamber; a sliding vane groove is provided on the cylinder body (1); the sliding vane is located in the sliding vane groove and can reciprocate along the sliding vane groove; one end of the sliding vane facing the piston abuts against the piston, thereby dividing the chamber into a first working chamber and a second working chamber; The cylinder body (1) in the first working chamber is provided with an air suction hole (2), and the cylinder body (1) in the second working chamber is provided with a liquid suction hole (4) and an exhaust cutout (3). The air suction hole (2) and the liquid suction hole (4) penetrate the side wall of the cylinder body (1) along the radial direction of the cylinder body (1). When the piston is driven to rotate eccentrically along the first rotation direction, the liquid suction hole (4) is closed, and the refrigerant is introduced into the first working chamber from the air suction hole (2) and discharged from the exhaust cutout (3). The compressor is operated according to the following steps: The normal compression working mode rotates forward; when the piston is driven to rotate eccentrically along the second rotation direction, the refrigerant is introduced into the second working chamber from the suction hole (4), discharged from the air suction hole (2), and successively passes through the indoor heat exchanger (9) and the outdoor heat exchanger (7), and enters the suction hole (4) again for circulation. The compressor performs a fluorine pump circulation mode, using the compressor as a refrigerant pump to circulate the refrigerant outdoors for heat exchange, making full use of the outdoor natural cold source. The first rotation direction is opposite to the second rotation direction.

2. The rotary compressor according to claim 1, characterized in that: A liquid suction valve (5) is provided between the liquid suction hole (4) and the chamber, and the liquid suction valve (5) controls the connection and disconnection between the liquid suction hole (4) and the chamber.

3. The rotary compressor according to claim 2, characterized in that: The liquid suction valve (5) is a one-way valve, which controls the flow of liquid only from outside the chamber to inside the chamber.

4. The rotary compressor according to claim 3, characterized in that: The liquid suction valve (5) comprises a valve plate, and the valve plate is arranged at the opening of the liquid suction hole (4) facing the chamber.

5. The rotary compressor according to claim 4, characterized in that: The opening of the liquid suction hole (4) is opened in the exhaust cutout (3), and the valve plate is located in the exhaust cutout (3) and covers the opening of the liquid suction hole (4).

6. The rotary compressor according to claim 5, characterized in that: The exhaust cutout (3) is at least partially configured as a plane, and is closely matched with the valve plate.

7. The rotary compressor according to claim 6, characterized in that: The valve plate is fixed to the exhaust cutout (3) by welding.

8. The rotary compressor according to claim 1, characterized in that: The diameter of the liquid suction hole (4) is 0.5-3 mm.

9. The rotary compressor according to claim 1, characterized in that: The angle between the liquid suction hole (4) and the slide groove is between 0 and 15 degrees.

10. A refrigeration system, characterized in that: The invention comprises an outdoor heat exchanger (7), an indoor heat exchanger (9) and a rotary compressor according to any one of claims 1 to 9, wherein the rotary compressor further comprises an exhaust pipe, one end of the indoor heat exchanger (9) is connected to the air suction hole (2), and the other end of the indoor heat exchanger (9) is connected to the outdoor heat exchanger (7), the outdoor heat exchanger (7) is respectively connected to the exhaust pipe and the suction hole (4), a first control valve (12) is arranged between the outdoor heat exchanger (7) and the suction hole (4), and when the piston of the rotary compressor (6) is driven to rotate eccentrically along the first rotation direction, the first control valve (12) cuts off the connection between the outdoor heat exchanger (7) and the suction hole (4), and the refrigerant The refrigerant enters the rotary compressor (6) through the air intake hole (2), is discharged through the exhaust port (3), and passes through the outdoor heat exchanger (7) and the indoor heat exchanger (9) in sequence, and then enters the rotary compressor (6) through the air intake hole (2) for circulation; when the piston of the rotary compressor (6) is driven to rotate eccentrically along the second rotation direction, the first control valve (12) connects the outdoor heat exchanger (7) and the suction hole (4), and the refrigerant enters the rotary compressor (6) through the suction hole (4), is discharged through the air intake hole (2), and passes through the indoor heat exchanger (9) and the outdoor heat exchanger (7) in sequence, and then enters the rotary compressor (6) through the suction hole (4) for circulation.

11. The refrigeration system according to claim 10, characterized in that: A third control valve (10) is provided between the outdoor heat exchanger (7) and the exhaust pipe. When the piston of the rotary compressor (6) is driven to rotate eccentrically along a first rotation direction, the third control valve (10) opens the connection between the outdoor heat exchanger (7) and the exhaust pipe; when the piston of the rotary compressor (6) is driven to rotate eccentrically along a second rotation direction, the third control valve (10) cuts off the connection between the outdoor heat exchanger (7) and the exhaust pipe.

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