CN111121348B

CN111121348B - Expander and refrigerating system with same

Info

Publication number: CN111121348B
Application number: CN201911368915.7A
Authority: CN
Inventors: 胡余生; 魏会军; 徐嘉; 何洋; 罗发游; 任丽萍; 万鹏凯; 吴飞
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-10-20
Anticipated expiration: 2039-12-26
Also published as: CN111121348A

Abstract

The invention provides an expander and a refrigeration system with the same, wherein the expander comprises: a cylinder; the flange is arranged on the cylinder, a first accommodating groove and a first gas suction groove are formed in the flange, and the first gas suction groove is formed in the first accommodating groove; the adjusting assembly is arranged in the first accommodating groove and is provided with a flow channel, a first pressure channel and a second pressure channel, at least part of the flow channel is positioned between the first pressure channel and the second pressure channel, and the outlet end of the flow channel is opposite to the first air suction groove; wherein at least a part of the regulating member is rotatably provided, the first pressure passage is communicated with an expansion pressure chamber of the cylinder, and the second pressure passage is communicated with a discharge pressure chamber of the cylinder to rotate at least a part of the regulating member under a pressure difference of the first pressure passage and the second pressure passage to change a suction amount of the gas by changing a flow rate of the flow passage. The technical problem that the expander in the prior art is low in efficiency is solved.

Description

Expander and refrigerating system with same

Technical Field

The invention relates to the technical field of expanders, in particular to an expander and a refrigeration system with the same.

Background

At present, in a vapor compression refrigeration system, a throttling element is an important element for maintaining the pressure difference between a condenser and an evaporator and controlling and regulating the flow of the system, and throttling elements commonly used in household and commercial refrigeration equipment are a throttling valve and a capillary tube. The working principle of the throttle valve and the capillary tube is that the pressure of the refrigerant is rapidly reduced by utilizing local resistance loss. The throttling loss of carbon dioxide in the transcritical cycle accounts for 25% -30% of the total available energy loss, and the available energy loss of even the traditional refrigerant in the throttling process accounts for 10% -20% of the total loss of the system. Throttling losses are irreversible losses that reduce the thermodynamic integrity of the cycle. Theoretically, if a reversible adiabatic expansion process is used for replacing an irreversible isenthalpic throttling process, the entropy increase of a system can be reduced, and the thermodynamic perfection of the system is improved. The expander can theoretically realize reversible adiabatic expansion of the refrigerant, and realize energy recovery and utilization.

However, because the volume of the expansion pressure chamber of the expander cannot change along with the working conditions and the inlet and the outlet of the traditional refrigerant are involved in phase change during throttling, when the expander is designed, the expander is generally designed according to a fixed expansion ratio (expansion ratio: the ratio of the volume of the expansion pressure chamber at the beginning of exhausting to the volume at the end of sucking), and after the expansion ratio is fixed, the expander is under-expanded or over-expanded in most cases, and the under-expanded or over-expanded is the main reason for low efficiency of the expander.

Disclosure of Invention

The invention mainly aims to provide an expander and a refrigeration system with the same, and aims to solve the technical problem that the expander in the prior art is low in efficiency.

In order to achieve the above object, according to one aspect of the present invention, there is provided an expander comprising: a cylinder; the flange is arranged on the cylinder, a first accommodating groove and a first gas suction groove are formed in the flange, the first gas suction groove is formed in the first accommodating groove, and the first gas suction groove is communicated with the cylinder so as to introduce gas into the cylinder through the first gas suction groove; the adjusting assembly is arranged in the first accommodating groove and provided with a circulation channel, a first pressure channel and a second pressure channel, the first pressure channel and the second pressure channel are arranged at intervals, at least part of the circulation channel is positioned between the first pressure channel and the second pressure channel, and the outlet end of the circulation channel is arranged opposite to the first air suction groove so that the circulation channel is communicated with the first air suction groove and air is provided for the first air suction groove through the circulation channel; wherein at least a part of the regulating member is rotatably provided, the first pressure passage is communicated with an expansion pressure chamber of the cylinder, and the second pressure passage is communicated with a discharge pressure chamber of the cylinder to rotate at least a part of the regulating member under a pressure difference of the first pressure passage and the second pressure passage to change a suction amount of the gas by changing a flow rate of the flow passage.

Furthermore, a first expansion pressure channel is arranged on the flange, one end of the first expansion pressure channel is communicated with the expansion pressure cavity, and the other end of the first expansion pressure channel is communicated with the first pressure channel, so that the first pressure channel is communicated with the expansion pressure cavity through the first expansion pressure channel.

Furthermore, a first exhaust pressure channel is arranged on the flange, one end of the first exhaust pressure channel is communicated with the exhaust pressure cavity, and the other end of the first exhaust pressure channel is communicated with a second pressure channel, so that the second pressure channel is communicated with the exhaust pressure cavity through the first exhaust pressure channel.

Further, the adjustment assembly includes: the outer ring is arranged in the first accommodating groove and comprises a first annular part and a first stopping part, the first stopping part is arranged on the first annular part, the first stopping part is provided with a first stopping end and a second stopping end which are oppositely arranged, and a second air suction groove is formed in the outer ring; the first air suction grooves and the second air suction grooves are arranged at intervals along the axial extension direction of the flange; the inner ring is movably arranged on the outer ring and is positioned in an accommodating area defined by the first annular part, the inner ring comprises a second stopping part, the second stopping part is provided with a third stopping end and a fourth stopping end which are oppositely arranged, the first stopping end and the third stopping end are oppositely arranged to define a first pressure channel, and the second stopping end and the fourth stopping end are oppositely arranged to define a second pressure channel so as to drive the inner ring to rotate under the pressure difference of the first pressure channel and the second pressure channel; the inner ring is provided with a third air suction groove, the circulation channel comprises a second air suction groove and a third air suction groove which are communicated in sequence, and the third air suction groove and the second air suction groove are arranged oppositely to change the circulation of the circulation channel by changing the staggered condition of the third air suction groove and the second air suction groove.

Further, the inner ring also comprises a second annular part and a third annular part, the second annular part is arranged on the third annular part, and the outer diameter of the second annular part is larger than that of the third annular part; the second stopping part is arranged along the outer edge of the third annular part, the third air suction groove is arranged on the second annular part, and the third annular part is provided with a fourth air suction groove; along the axial extension direction of the inner ring, the third air suction groove and the fourth air suction groove are arranged at intervals, and the air outlet end of the fourth air suction groove forms the outlet end of the flow channel; the flow channel has a flow state and a stop state, and when the flow channel is in the flow state, the third suction groove is communicated with the fourth suction groove to provide gas for the cylinder; when the flow passage is in a cut-off state, the third suction groove is blocked from the fourth suction groove to stop supplying gas to the cylinder.

Further, the expander further includes: the cylinder, the flange, the outer ring and the inner ring are all arranged on the crankshaft in a penetrating mode, a communicating groove is formed in the outer wall of the crankshaft, and the second air suction groove, the third air suction groove, the communicating groove and the fourth air suction groove are sequentially communicated to form a circulating channel in a surrounding mode; when the circulation channel is in a circulation state, the crankshaft rotates to a position communicated with the third air suction groove and the fourth air suction groove; when the flow passage is in a cut-off state, the crankshaft rotates to a position avoiding the third air suction groove and the fourth air suction groove.

Further, an air suction channel is arranged on the flange, a first communication port is arranged on the first annular part, and the first communication port and the air suction channel are oppositely arranged so that the first communication port is communicated with the air suction channel; the first communicating port is communicated with the second air suction groove, so that the gas in the air suction channel flows into the second air suction groove through the first communicating port.

Further, the first air suction groove is a first fan-shaped groove, and the second air suction groove is a second fan-shaped groove.

Further, the corresponding circumferential angle of the first fan-shaped groove is the same as that of the second fan-shaped groove.

Furthermore, the third air suction groove is a third fan-shaped groove, and the fourth air suction groove is a fourth fan-shaped groove.

Further, the circumferential angle corresponding to the third fan-shaped groove is the same as the circumferential angle corresponding to the fourth fan-shaped groove.

Furthermore, the cylinder is provided with an exhaust hole and an exhaust groove, and the exhaust hole is communicated with the exhaust pressure cavity; one end of the exhaust groove is communicated with the exhaust hole, and the other end of the exhaust groove is communicated with the first exhaust pressure channel, so that the first exhaust pressure channel is communicated with the exhaust pressure cavity.

Furthermore, the exhaust groove is an arc-shaped groove, and one end of the arc-shaped groove is provided with an opening structure so that the exhaust hole is communicated with the arc-shaped groove through the opening structure; the other end of the exhaust groove is communicated with one end of the first exhaust pressure channel.

Furthermore, a first exhaust pressure channel is further arranged on the flange, one end of the first exhaust pressure channel is communicated with the exhaust pressure cavity, the other end of the first exhaust pressure channel is located on the side wall of the first accommodating groove, a second communicating port is arranged on the side wall of the first annular portion, and the second communicating port is arranged opposite to the other end of the first exhaust pressure channel so that the first exhaust pressure channel is communicated with the second pressure channel through the second communicating port.

Furthermore, the other end of the first expansion pressure channel is positioned at the bottom of the first accommodating groove, so that the gas in the expansion pressure cavity enters the first accommodating groove after passing through the first expansion pressure channel.

Further, the expander still includes the apron, and the apron is located first holding tank, and the apron setting is on adjusting part.

According to another aspect of the present invention, there is provided a refrigeration system comprising an expander, the expander being as provided above.

By applying the technical scheme of the invention, when the pressure of the expansion pressure cavity and the pressure of the exhaust pressure cavity have a pressure difference, the pressure difference exists in the first pressure passage and the second pressure passage, the pressure difference is reduced under the action of the pressure difference to drive at least part of the adjusting assembly to rotate, so that the suction amount of the gas is changed by changing the flow rate of the flow passage, the self-adaptive expansion ratio (variable expansion ratio) of the expansion machine is realized by controlling the intake amount of the gas, the suction amount is adjusted according to the under-expansion or over-expansion condition of the expansion machine, and the operation efficiency of the expansion machine can be improved. Therefore, the technical problem that the expander in the prior art is low in efficiency can be solved through the technical scheme provided by the invention.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 illustrates an exploded view of an expander provided in accordance with an embodiment of the present invention;

fig. 2 shows a cross-sectional view of an expander provided according to an embodiment of the present invention;

FIG. 3 illustrates a schematic structural view of a flange provided according to an embodiment of the present invention;

FIG. 4 illustrates a schematic structural view of an outer race according to an embodiment of the present invention;

FIG. 5 illustrates a schematic structural diagram of an inner race, according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram illustrating a crankshaft provided in accordance with an embodiment of the present invention;

fig. 7 is a schematic flow diagram illustrating a refrigerant flow channel of an expander according to an embodiment of the present invention;

fig. 8 is a schematic structural view illustrating a movement of a crankshaft of the expander to a suction start angular position according to an embodiment of the present invention;

fig. 9 is a schematic view showing a structure in which a crankshaft of the expander is moved to a suction cutoff angle position, according to an embodiment of the present invention;

FIG. 10 illustrates an assembly view of the inner race, the outer race, and the flange provided in accordance with an embodiment of the present invention;

FIG. 11 illustrates a schematic diagram of a roller according to an embodiment of the present invention; and

fig. 12 is a schematic structural diagram illustrating a cylinder according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a flange; 11. a first accommodating groove; 12. a first expansion pressure channel; 13. a first exhaust pressure channel; 14. an air suction passage; 15. an exhaust passage; 16. an air inlet; 20. an expansion pressure chamber; 30. an outer ring; 31. a first annular portion; 311. a first communication port; 312. a second communication port; 32. a first stopper portion; 321. a first stop end; 322. a second stop end; 40. an inner ring; 41. a second annular portion; 42. a third annular portion; 43. a second stopper portion; 431. a third stop end; 432. a fourth stopper end; 50. a crankshaft; 51. a communicating groove; 60. a cylinder; 61. an exhaust hole; 62. an exhaust groove; 63. a suction hole; 71. a first getter tank; 72. a second suction groove; 73. a third suction groove; 74. a fourth suction groove; 81. a first pressure channel; 82. a second pressure channel; 90. sliding blades; 100. a roller; 101. a second expansion pressure channel; 102. a third expansion pressure channel; 110. and (7) a cover plate.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 12, an embodiment of the present invention provides an expander including a cylinder 60, a flange 10, and an adjustment assembly. The flange 10 is arranged on the cylinder 60, the flange 10 is provided with a first accommodating groove 11 and a first air suction groove 71, the first air suction groove 71 is arranged on the first accommodating groove 11, and the first air suction groove 71 is communicated with the cylinder 60 so as to introduce air into the cylinder 60 through the first air suction groove 71. The adjusting assembly is disposed in the first receiving groove 11, the adjusting assembly has a flow passage, a first pressure passage 81 and a second pressure passage 82, the first pressure passage 81 and the second pressure passage 82 are disposed at an interval, at least a portion of the flow passage is located between the first pressure passage 81 and the second pressure passage 82, an outlet end of the flow passage is disposed opposite to the first suction groove 71, so that the flow channel communicates with the first suction groove 71 to supply the gas to the first suction groove 71 through the inside of the flow channel, wherein, at least part of the adjustment assembly is rotatably arranged, the first pressure channel 81 is in communication with the expansion pressure chamber 20 of the cylinder 60, the second pressure channel 82 is in communication with the discharge pressure chamber of the cylinder 60, to rotate at least part of the regulating assembly at the pressure difference of the first pressure channel 81 and the second pressure channel 82 to change the inhaled quantity of gas by changing the flow through channel. Specifically, the flange 10 in this embodiment may be an upper flange or a lower flange.

With the expander provided by the invention, when the over-expansion or under-expansion occurs, a pressure difference exists between the pressure of the expansion pressure cavity 20 and the pressure of the exhaust pressure cavity, and because the first pressure channel 81 is communicated with the expansion pressure cavity 20 and the second pressure channel 82 is communicated with the exhaust pressure cavity, a pressure difference also exists between the first pressure channel 81 and the second pressure channel 82. At least a part of the adjustment assembly will be driven to rotate under the pressure difference between the first pressure passage 81 and the second pressure passage 82 to change the amount of gas sucked in. Thus, the suction amount of the gas is adjusted according to the under-expansion or over-expansion condition in actual operation, so that the operation efficiency of the expander is improved.

Specifically, the flange 10 in this embodiment is provided with a first expansion pressure channel 12, one end of the first expansion pressure channel 12 is communicated with the expansion pressure chamber 20, and the other end of the first expansion pressure channel 12 is communicated with the first pressure channel 81, so that the first pressure channel 81 is communicated with the expansion pressure chamber 20 through the first expansion pressure channel 12. With such an arrangement, it is possible to facilitate communication of the first pressure passage 81 with the expansion pressure chamber 20, optimizing the layout and arrangement of the structure.

In this embodiment, the flange 10 is provided with a first exhaust pressure passage 13, one end of the first exhaust pressure passage 13 is communicated with the exhaust pressure chamber, and the other end of the first exhaust pressure passage 13 is communicated with the second pressure passage 82, so that the second pressure passage 82 is communicated with the exhaust pressure chamber through the first exhaust pressure passage 13. With this arrangement, it is possible to facilitate communication of the second pressure passage 82 with the discharge pressure chamber, optimizing the layout and arrangement of the structure.

Specifically, the adjusting assembly in this embodiment includes an outer ring 30 and an inner ring 40, the outer ring 30 is disposed in the first receiving groove 11, and the outer ring 30 and the first receiving groove 11 are in interference fit. The outer ring 30 includes a first annular portion 31 and a first stopper portion 32, the first stopper portion 32 is disposed on the first annular portion 31, the first stopper portion 32 has a first stopper end 321 and a second stopper end 322, which are disposed opposite to each other, and the outer ring 30 is provided with a second suction groove 72. The first suction grooves 71 and the second suction grooves 72 are provided at intervals in the axial extension direction of the flange 10. The inner ring 40 is movably disposed on the outer ring 30, the inner ring 40 is located in a receiving area defined by the first annular portion 31, the inner ring 40 includes a second stopping portion 43, the second stopping portion 43 has a third stopping end 431 and a fourth stopping end 432 opposite to each other, the first stopping end 321 and the third stopping end 431 are disposed opposite to each other to define a first pressure channel 81, and the second stopping end 322 and the fourth stopping end 432 are disposed opposite to each other to define a second pressure channel 82, so that the inner ring 40 is driven to rotate under a pressure difference between the first pressure channel 81 and the second pressure channel 82. Specifically, the first blocking portion 32 and the second blocking portion 43 in the present embodiment may be both arc-shaped structures. Wherein, the inner ring 40 is provided with a third air suction groove 73, the flow passage comprises a second air suction groove 72 and a third air suction groove 73 which are communicated in sequence, the third air suction groove 73 is arranged opposite to the second air suction groove 72, so that the flow amount of the flow passage can be changed by changing the interleaving condition of the third air suction groove 73 and the second air suction groove 72. With the arrangement, the suction amount of the gas can be adjusted better according to the over-expansion or under-expansion condition, so that the expansion efficiency of the expansion machine can be improved better.

In the present embodiment, the inner ring 40 further includes a second annular portion 41 and a third annular portion 42, the second annular portion 41 being provided on the third annular portion 42, the outer diameter of the second annular portion 41 being larger than the outer diameter of the third annular portion 42. The second stopper portion 43 is disposed along an outer edge of the third annular portion 42, the third suction groove 73 is disposed on the second annular portion 41, and the fourth suction groove 74 is disposed on the third annular portion 42. The third suction grooves 73 are spaced apart from the fourth suction grooves 74 in the axial extension direction of the inner ring 40, and the outlet ends of the fourth suction grooves 74 form outlet ends of the flow channels. The flow passage has a flow-through state and a shut-off state, and when the flow passage is in the flow-through state, the third suction grooves 73 communicate with the fourth suction grooves 74 to supply gas to the cylinder 60. When the flow passage is in a cut-off state, the third suction groove 73 is blocked from the fourth suction groove 74 to stop the supply of gas to the cylinder 60. With this arrangement, the control of the suction of the cylinder 60 can be facilitated.

Specifically, the expander in this embodiment further includes a crankshaft 50, the cylinder 60, the flange 10, the outer ring 30 and the inner ring 40 are all disposed on the crankshaft 50 in a penetrating manner, a communicating groove 51 is disposed on an outer wall of the crankshaft 50, and the second suction groove 72, the third suction groove 73, the communicating groove 51 and the fourth suction groove 74 are sequentially communicated to define a flow channel, the flow channel is used for communicating with the suction hole 63 on the cylinder 60, and specifically, the suction hole 63 is communicated with the first suction groove 71. When the flow passage is in the flow state, the crankshaft 50 is rotated to a position where it communicates with both the third air suction groove 73 and the fourth air suction groove 74. When the flow passage is in the blocked state, the crankshaft 50 rotates to a position avoiding the third air suction groove 73 and the fourth air suction groove 74. With this arrangement, the suction state of the cylinder 60 can be better controlled in accordance with the motion state of the crankshaft 50.

In the present embodiment, the suction passage 14 is provided in the flange 10, the first annular portion 31 is provided with the first communication port 311, and the first communication port 311 is provided opposite to the suction passage 14 so that the first communication port 311 communicates with the suction passage 14. The first communication port 311 communicates with the second suction groove 72 so that the gas from the suction passage 14 flows into the second suction groove 72 through the first communication port 311. The arrangement is such that the refrigerant flows into the second suction groove 72 through the first communication port 311 after passing through the suction passage 14, and flows from above the flange 10 to the outer ring 30.

Specifically, the first suction groove 71 in this embodiment is a first fan-shaped groove, and the second suction groove 72 is a second fan-shaped groove.

Specifically, the circumferential angle corresponding to the first sector groove is the same as the circumferential angle corresponding to the second sector groove, and specifically, when the fan-shaped fan.

Specifically, the third suction groove 73 in the present embodiment is a third fan-shaped groove, and the fourth suction groove 74 is a fourth fan-shaped groove.

Specifically, the circumferential angle corresponding to the third sector-shaped groove is the same as the circumferential angle corresponding to the fourth sector-shaped groove, and the third sector-shaped groove and the fourth sector-shaped groove are correspondingly arranged, so that the third sector-shaped groove and the fourth sector-shaped groove move to the position communicated with the communication groove 51 at the same time, or the third sector-shaped groove and the fourth sector-shaped groove move to the position avoiding the communication groove 51 at the same time.

In the present embodiment, an exhaust hole 61 and an exhaust groove 62 are provided on the cylinder 60, and the exhaust hole 61 communicates with the exhaust pressure chamber. One end of the exhaust groove 62 communicates with the exhaust hole 61, and the other end of the exhaust groove 62 communicates with the first exhaust pressure passage 13, so that the first exhaust pressure passage 13 communicates with the exhaust pressure chamber. With this arrangement, by the arrangement of the exhaust holes 61 and the exhaust grooves 62, it is possible to facilitate the communication of the exhaust pressure chamber with the first exhaust pressure passage 13, optimizing the structure and spatial layout.

Specifically, the exhaust groove 62 in this embodiment is an arc-shaped groove, one end of the arc-shaped groove is provided with an opening structure, so that the exhaust hole 61 is communicated with the arc-shaped groove through the opening structure, and the other end of the exhaust groove 62 is communicated with one end of the first exhaust pressure channel 13. This arrangement is adopted to facilitate better introduction of the gas in the gas discharge groove 62 into the first gas discharge pressure passage 13.

Specifically, in this embodiment, the flange 10 is further provided with a first exhaust pressure channel 13, one end of the first exhaust pressure channel 13 is communicated with the exhaust pressure chamber, the other end of the first exhaust pressure channel 13 is located on the side wall of the first accommodating groove 11, the side wall of the first annular portion 31 is provided with a second communicating port 312, the second communicating port 312 is arranged opposite to the other end of the first exhaust pressure channel 13, so that the first exhaust pressure channel 13 is communicated with the second pressure channel 82 through the second communicating port 312, so that the second pressure channel 82 is better communicated with the first exhaust pressure channel 13, and the pressure of the real exhaust pressure chamber is reflected.

Specifically, the other end of the first expansion pressure channel 12 in this embodiment is located at the bottom of the first accommodating groove 11, so that the gas in the expansion pressure chamber 20 enters the first accommodating groove 11 after passing through the first expansion pressure channel 12, and then enters the first pressure channel 81, so as to reflect the actual pressure of the expansion pressure chamber 20.

In this embodiment, the expander further includes a cover plate 110, the cover plate 110 is located in the first receiving groove 11, and the cover plate 110 is disposed on the adjustment assembly.

The expander in the embodiment utilizes the pressure difference between the expansion pressure cavity 20 and the exhaust pressure cavity to enable the inner ring 40 to rotate relative to the outer ring 30 so as to change the refrigerant intake cut-off angle, and further increase or reduce the intake of the refrigerant, so that the expander can realize the self-adaptive expansion ratio under different working conditions, and further the expansion efficiency of the expander is improved. The outer ring 30 is coaxially installed on the circumferential surface of the concave table of the lower flange (i.e. the circumferential surface of the first accommodating groove 11), and the circumferential surface of the concave table of the lower flange is in interference fit with the outer circumferential surface of the outer ring 30, the inner ring 40 is coaxially installed inside the outer ring 30, and the inner ring 40 can rotate in the second accommodating groove of the outer ring 30.

The expander in this embodiment further comprises a slide 90 and a roller 100, and the roller 100 is provided with a second expansion pressure passage 101 and a third expansion pressure passage 102. The exhaust pressure chamber in this embodiment is communicated with the first exhaust pressure passage 13 on the lower flange, the first exhaust pressure passage 13 is communicated with the ring groove (here, the ring groove is the exhaust groove 62) on the cylinder 60, and the ring groove is communicated with the exhaust hole 61. The expansion pressure chamber 20 communicates with the first expansion pressure channel 12 on the lower flange, the second expansion pressure channel 101 is always in communication with the expansion pressure chamber 20 and the third expansion pressure channel 102 on the roller 100, and when the expander is about to discharge, the third expansion pressure channel 102 communicates with the first expansion pressure channel 12.

Specifically, a circular stepped concave platform (i.e., the first receiving groove 11) is disposed at the back of the lower flange in this embodiment, and a first fan-shaped groove is formed in an end surface of the concave platform. A first exhaust pressure channel 13 is located on the lower flange.

In this embodiment, the outer ring 30 is coaxially mounted on the circumferential surface of the recessed portion of the lower flange, the outer ring 30 is provided therein with a non-circular step surface (the non-circular step surface forms the first stopper portion 32), the step surface is provided with the second fan-shaped groove, and the side surface of the outer ring 30 is provided with a refrigerant passage (the refrigerant passage is the first communication port 311).

In this embodiment, the inner ring 40 is coaxially installed inside the outer ring 30, and the inner ring 40 rotates inside the outer ring 30, the outer ring 30 is composed of two large and small hollow cylinders, a third fan-shaped groove is formed in the large hollow cylinder, a fourth fan-shaped groove is formed in the small hollow cylinder, and the third fan-shaped groove and the fourth fan-shaped groove have the same direction and the same angle.

The expander provided by the embodiment of the invention has the advantages of few parts, simple structure and easiness in manufacturing and realization.

As shown in fig. 3, the flange 10 in the embodiment of the present invention is a lower flange, and a circular step concave platform is arranged at the back of the lower flange, the concave platform is used for placing the outer ring 30, a first fan-shaped groove is arranged at the end surface of the concave platform, one side of the first fan-shaped groove is used for controlling the suction starting angle (the angle is constant), the refrigerant enters the pump body from the suction channel 14, and the pressure of the suction channel 14 is the same as the pressure of the condenser. The refrigerant is discharged from the exhaust passage 15 after being expanded in the cylinder 60, and the pressure of the exhaust passage 15 is the same as the pressure of the evaporator.

As shown in fig. 4, in the embodiment of the present invention, the outer ring 30 is coaxially installed on the circumferential surface of the lower flange concave, the circumferential surface of the lower flange concave is in interference fit with the outer circumferential surface of the outer ring 30, a non-full-circle step surface is provided inside the outer ring 30, a second fan-shaped groove is provided on the step surface, the left side of the second fan-shaped groove and the right side of the second fan-shaped groove respectively correspond to the left side of the first fan-shaped groove and the right side of the first fan-shaped groove on the lower flange, and the circumferential angle corresponding to the first fan-shaped groove is the same as the circumferential angle corresponding to the second. The left and right ribs of the non-circular stepped surface (i.e., the first stopper portion 32) respectively cooperate with the left and right ribs of the inner ring 40 to limit the rotation angle of the inner ring 40 relative to the outer ring 30. A refrigerant passage is formed in a side surface of the outer ring 30, and the refrigerant sucked from the lower flange is introduced into the outer ring 30 through the refrigerant passage.

As shown in fig. 5, the inner ring 40 in the embodiment of the present invention is coaxially installed inside the outer ring 30, and the inner ring 40 can rotate inside the outer ring 30, the outer ring 30 is formed by two large and small hollow cylinders, a third fan-shaped groove is formed on the large hollow cylinder, a fourth fan-shaped groove is formed on the small hollow cylinder, the directions of the third fan-shaped groove and the fourth fan-shaped groove are the same, and the angles are the same. The third fan-shaped groove is matched with the second fan-shaped groove on the outer ring 30 to control the refrigerant to flow from the outer ring 30 to the inner ring 40, and the fourth fan-shaped groove is matched with the first fan-shaped groove on the lower flange to control the refrigerant to flow from the inner ring 40 to the lower flange.

As shown in fig. 6, in the present embodiment, a communication groove 51 is opened at the short axis of the crankshaft 50 for the flow of the cooling medium, and specifically, the communication groove 51 is a circumferential channel.

Fig. 7 is a schematic diagram of a refrigerant flow channel of the present invention, and it can be seen from fig. 2 that, after entering the pump body from the suction channel 14 on the lower flange, the refrigerant flows through the refrigerant channel of the outer ring 30 and enters the second sector groove (third sector groove), then the refrigerant flows from the large arc end of the third sector groove to the small arc end, and then the refrigerant enters the upper portion of the short-axis circumferential channel of the crankshaft 50 from the small end of the third sector groove, and then flows from the upper portion of the circumferential channel to the lower portion to enter the fourth sector groove (first sector groove), and finally enters the cylinder 60 through the lower flange air inlet 16 to expand.

Fig. 8 and 9 are schematic diagrams illustrating a suction start angle and a suction stop angle of the present invention, in a rotation process of the crankshaft 50, the circumferential channel on the short shaft of the crankshaft 50 can periodically turn on or off the third sector groove (the second sector groove) and the fourth sector groove (the first sector groove) to realize suction and stop of the refrigerant. As shown in fig. 8 and 9, the inhalation start angle is defined as: when the right side of the circumferential channel is just in contact with one end of the sector groove during the counterclockwise rotation of the crankshaft 50, the rotation angle of the roller 100 (the included angle formed by the central line of the slide 90 and the central connecting line of the cylinder 60 and the roller 100) is at this time. When the rotation angle of the roller 100 reaches this angle, the expander starts sucking the refrigerant. The suction cutoff angle is defined as: one side of the circumferential channel is at an angle to the right side of the fourth sector groove just prior to disengagement from the roller 100. After the angle is exceeded, the expander does not suck the refrigerant any more, and the refrigerant in the expansion pressure cavity 20 begins to expand to push the crankshaft 50 to rotate to do work.

Fig. 10 is a schematic view illustrating the assembly of the inner ring 30, the outer ring 30 and the lower flange, wherein the inner ring 40, the outer ring 30, the lower flange and the cover plate 110 together define two chambers, namely an expansion pressure chamber 20 and a discharge pressure chamber. Wherein the exhaust pressure cavity is communicated with a first exhaust pressure channel 13 on the lower flange, the first exhaust pressure channel 13 is communicated with a ring groove on the cylinder 60, as shown in fig. 12, the ring groove on the cylinder 60 is communicated with an exhaust hole 61, therefore, the pressure of the part of the channel is always the evaporator pressure; the expansion pressure chamber 20 is communicated with the first expansion pressure channel 12 on the lower flange, as shown in fig. 11, the second expansion pressure channel 101 is always communicated with the expansion pressure chamber 20 and the third expansion pressure channel 102 on the roller 100, when the expander is about to exhaust, the third expansion pressure channel 102 is communicated with the first expansion pressure channel 12, and at this time, the pressure of the expansion pressure chamber 20 is the current pressure of the expansion pressure chamber 20. When the working condition of the air conditioning system changes, the refrigerant discharged from the expander is in an overexpansion or underexpansion state at the moment, the expansion ratio needs to be changed for adapting to the working condition of the system, if the pressure of the expansion pressure cavity 20 is greater than the pressure of the exhaust pressure cavity at the moment, namely the refrigerant in the expander is in an underexpansion state, at the moment, the inner ring 40 is driven to rotate clockwise under the pressure difference between the expansion pressure cavity 20 and the exhaust pressure cavity, the suction cut-off angle shown in fig. 9 is caused to be reduced, so that the intake of the refrigerant in the next working cycle of the expander is reduced, the expansion ratio is changed, and if the refrigerant is overexpanded, the expansion ratio is.

According to a second embodiment of the present invention, a refrigeration system is provided, which includes an expander, wherein the expander is provided in the first embodiment.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the refrigerant intake cut-off angle of the expander is changed by utilizing the condition of under expansion or over expansion when the expander runs in the system, and further the refrigerant intake amount is controlled to realize the self-adaptive expansion ratio (variable expansion ratio) of the expander. According to the invention, two parts of the inner ring and the outer ring are added at the lower flange of the expander, the inner ring rotates relative to the outer ring by utilizing the pressure difference of the expansion pressure cavity and the exhaust pressure cavity to change the refrigerant intake cut-off angle, and the refrigerant intake is increased or reduced to realize the self-adaptive expansion ratio of the expander under different working conditions.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An expander, comprising:

a cylinder (60);

the flange (10) is arranged on the cylinder (60), a first accommodating groove (11) and a first gas suction groove (71) are arranged on the flange (10), the first gas suction groove (71) is arranged on the first accommodating groove (11), and the first gas suction groove (71) is communicated with the cylinder (60) so as to introduce gas into the cylinder (60) through the first gas suction groove (71);

a regulating member disposed in the first receiving groove (11), the regulating member having a flow passage, a first pressure passage (81) and a second pressure passage (82), the first pressure passage (81) and the second pressure passage (82) being spaced apart, at least a portion of the flow passage being located between the first pressure passage (81) and the second pressure passage (82), an outlet end of the flow passage being disposed opposite the first suction groove (71) to communicate the flow passage with the first suction groove (71) to supply gas to the first suction groove (71) through the flow passage;

wherein at least a part of the regulating assembly is rotatably provided, the first pressure passage (81) communicates with an expansion pressure chamber (20) of the cylinder (60), and the second pressure passage (82) communicates with a discharge pressure chamber of the cylinder (60) to rotate at least a part of the regulating assembly under a pressure difference of the first pressure passage (81) and the second pressure passage (82) to change a suction amount of gas by changing a flow amount of the flow passage.

2. The expansion machine according to claim 1, wherein a first expansion pressure channel (12) is provided on the flange (10), one end of the first expansion pressure channel (12) communicates with the expansion pressure chamber (20), and the other end of the first expansion pressure channel (12) communicates with the first pressure channel (81) so that the first pressure channel (81) communicates with the expansion pressure chamber (20) through the first expansion pressure channel (12).

3. The expander according to claim 1, wherein a first exhaust pressure passage (13) is provided in the flange (10), one end of the first exhaust pressure passage (13) communicates with the exhaust pressure chamber, and the other end of the first exhaust pressure passage (13) communicates with the second pressure passage (82) so that the second pressure passage (82) communicates with the exhaust pressure chamber through the first exhaust pressure passage (13).

4. The expander according to claim 1, wherein the adjustment assembly comprises:

the outer ring (30) is arranged in the first accommodating groove (11), the outer ring (30) comprises a first annular part (31) and a first stopping part (32), the first stopping part (32) is arranged on the first annular part (31), the first stopping part (32) is provided with a first stopping end (321) and a second stopping end (322) which are oppositely arranged, and the outer ring (30) is provided with a second air suction groove (72); the first air suction groove (71) and the second air suction groove (72) are arranged at intervals along the axial extension direction of the flange (10);

an inner ring (40) movably arranged on the outer ring (30), wherein the inner ring (40) is located in a containing area enclosed by the first annular portion (31), the inner ring (40) comprises a second stopping portion (43), the second stopping portion (43) is provided with a third stopping end (431) and a fourth stopping end (432) which are oppositely arranged, the first stopping end (321) and the third stopping end (431) are oppositely arranged to enclose the first pressure channel (81), and the second stopping end (322) and the fourth stopping end (432) are oppositely arranged to enclose the second pressure channel (82) so as to drive the inner ring (40) to rotate under the pressure difference of the first pressure channel (81) and the second pressure channel (82);

wherein, a third air suction groove (73) is arranged on the inner ring (40), the circulation channel comprises the second air suction groove (72) and the third air suction groove (73) which are communicated in sequence, the third air suction groove (73) is arranged opposite to the second air suction groove (72) so as to change the circulation quantity of the circulation channel by changing the staggered condition of the third air suction groove (73) and the second air suction groove (72).

5. The expander according to claim 4, wherein the inner ring (40) further comprises a second annular portion (41) and a third annular portion (42), the second annular portion (41) being provided on the third annular portion (42), the second annular portion (41) having an outer diameter larger than an outer diameter of the third annular portion (42); the second stop portion (43) is arranged along the outer edge of the third annular portion (42), the third air suction groove (73) is arranged on the second annular portion (41), and the third annular portion (42) is provided with a fourth air suction groove (74); the third air suction groove (73) and the fourth air suction groove (74) are arranged at intervals along the axial extension direction of the inner ring (40), and the air outlet end of the fourth air suction groove (74) forms the outlet end of the flow channel; the flow channel has a flow-through state and a shut-off state, and when the flow channel is in the flow-through state, the third suction groove (73) communicates with the fourth suction groove (74) to supply gas to the cylinder (60); when the flow passage is in the shut-off state, the third suction groove (73) is shut off from the fourth suction groove (74) to stop the supply of gas to the cylinder (60).

6. The expander according to claim 5, further comprising:

the cylinder (60), the flange (10), the outer ring (30) and the inner ring (40) are all arranged on the crankshaft (50) in a penetrating mode, a communication groove (51) is formed in the outer wall of the crankshaft (50), and the second air suction groove (72), the third air suction groove (73), the communication groove (51) and the fourth air suction groove (74) are sequentially communicated to form the circulation channel in a surrounding mode; when the flow passage is in the flow state, the crankshaft (50) is rotated to a position communicating with both the third air suction groove (73) and the fourth air suction groove (74); when the flow passage is in the shut-off state, the crankshaft (50) is rotated to a position avoiding the third air suction groove (73) and the fourth air suction groove (74).

7. The expander according to claim 4, wherein a suction channel is provided on the flange (10), a first communication port (311) is provided on the first annular portion (31), the first communication port (311) being disposed opposite to the suction channel so that the first communication port (311) communicates with the suction channel; the first communication port (311) communicates with the second suction groove (72) so that the gas in the suction passage flows into the second suction groove (72) through the first communication port (311).

8. The expander according to claim 4, wherein the first suction groove (71) is a first fan-shaped groove and the second suction groove (72) is a second fan-shaped groove.

9. The expander according to claim 8, wherein a circumferential angle corresponding to said first sector groove is the same as a circumferential angle corresponding to said second sector groove.

10. The expander according to claim 5, wherein the third suction groove (73) is a third sector groove and the fourth suction groove (74) is a fourth sector groove.

11. The expander according to claim 10, wherein a circumferential angle corresponding to said third sector groove is the same as a circumferential angle corresponding to said fourth sector groove.

12. The expander according to claim 3, wherein a discharge hole (61) and a discharge groove (62) are provided in the cylinder (60), the discharge hole (61) communicating with the discharge pressure chamber; one end of the exhaust groove (62) is communicated with the exhaust hole (61), and the other end of the exhaust groove (62) is communicated with the first exhaust pressure channel (13), so that the first exhaust pressure channel (13) is communicated with the exhaust pressure cavity.

13. The expander according to claim 12, wherein the exhaust slot (62) is an arc-shaped slot, and one end of the arc-shaped slot is provided with an opening structure so that the exhaust hole (61) is communicated with the arc-shaped slot through the opening structure; the other end of the exhaust groove (62) is communicated with one end of the first exhaust pressure channel (13).

14. The expander according to claim 4, wherein a first exhaust pressure passage (13) is further provided on the flange (10), one end of the first exhaust pressure passage (13) communicates with the exhaust pressure chamber, the other end of the first exhaust pressure passage (13) is located on a side wall of the first accommodating groove (11), a second communication port (312) is provided on a side wall of the first annular portion (31), and the second communication port (312) is disposed opposite to the other end of the first exhaust pressure passage (13) so that the first exhaust pressure passage (13) communicates with the second pressure passage (82) through the second communication port (312).

15. The expansion machine according to claim 2, wherein the other end of the first expansion pressure passage (12) is located at the bottom of the first accommodation groove (11) so that the gas in the expansion pressure chamber (20) enters the first accommodation groove (11) after passing through the first expansion pressure passage (12).

16. The expander according to claim 1, further comprising a cover plate located within the first receiving groove (11), the cover plate being provided on the adjustment assembly.

17. A refrigeration system comprising an expander, the expander being as claimed in any one of claims 1 to 16.