CN110966196A - Cylinder, compression mechanism, rotary compressor and heat pump device - Google Patents

Abstract

The invention discloses a cylinder, a compression mechanism, a rotary compressor and a heat pump device. The cylinder defines a compression chamber for rolling fit of the rollers. The peripheral wall of the cylinder is provided with a sliding vane groove and a first air limiting port that open toward the compression chamber. The peripheral wall of the cylinder defines a piston chamber, and the piston chamber is inside the compression chamber. A communication port is opened on the peripheral surface. According to the cylinder of the embodiment of the present invention, the way of increasing the displacement can reduce the number of parts of the compressor, reduce the volume and weight, and greatly reduce the cost.

Description

Cylinder, compression mechanism, rotary compressor and heat pump device

Technical Field

The invention relates to the field of compressors, in particular to an air cylinder, a compression mechanism, a rotary compressor and a heat pump device.

Background

The conventional means of realizing the technology comprises adding a rotary compression cavity on the existing rotary compressor, and realizing the technical purpose by carrying out related design and matching on the compression cavity. However, this design structure is prone to two major problems, the first is that the cost of the added rotary compression chamber is too high, and the cost of the corresponding series of structures is high; the second is the lower efficiency of the added rotary compression chamber.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the air cylinder of the rotary compressor, which can be additionally provided with the piston cavity in the peripheral wall of the original compression cavity, thereby avoiding the problem of excessive increase of the structural cost after the compression amount is increased.

The invention also provides a compression mechanism with the cylinder.

The invention also provides a rotary compressor with the compression mechanism.

The invention also provides a heat pump device with the rotary compressor.

According to the cylinder of the rotary compressor, the cylinder is internally provided with the compression cavity for the rolling fit of the roller, the peripheral wall of the cylinder is provided with the slide sheet groove which is opened towards the compression cavity, the peripheral wall of the cylinder is provided with the first air suction port, the peripheral wall of the cylinder is internally provided with the piston cavity, and the piston cavity is provided with the communication port on the inner peripheral surface of the compression cavity.

According to the cylinder provided by the embodiment of the invention, the compression amount can be increased, and compared with a mode of increasing the number of cylinders, the number of parts and components can be reduced, the volume and the weight of the compressor can be reduced, and the cost can be greatly reduced.

In some embodiments, the piston chamber is formed to penetrate in a radial direction of the compression chamber in a shape of the communication port.

In some embodiments, the central axis of the first intake port is in the same plane as the centerline of the piston chamber

Specifically, the piston chamber is disposed adjacent to the first suction port, and the first suction port is located between the communication port and the vane groove, or the communication port is located between the first suction port and the vane groove.

In some embodiments, a communication groove is provided on an inner circumferential surface of the compression chamber, one end of the communication groove extends to the first suction port, and the other end of the communication groove extends to the communication port.

Optionally, the size of the communication groove in the axial direction of the compression chamber is greater than 30% of the height of the cylinder, and the depth of the communication groove is greater than or equal to 0.5 mm.

A compression mechanism according to an embodiment of the present invention includes: a cylinder according to the above embodiment; a roller that is roll-fitted in a compression chamber of the cylinder; the sliding sheet is arranged in a sliding sheet groove of the air cylinder in a reciprocating motion mode, and the inner end of the sliding sheet is connected with the roller; the piston is arranged in a piston cavity of the cylinder in a reciprocating mode, and the head of the piston can extend into the compression cavity and is connected with the roller.

The compression mechanism of the embodiment of the invention breaks through the pump body structure of the existing rotary compressor, so that the compression of at least two cylinder bodies can be realized by compressing the original single cylinder body, and the combined compression of a main body pump body carrying a small pump body is completed. The piston cavity is formed by the cylinder, namely the compression cavity is formed by the existing parts, the structure is compact, the number of parts is reduced, the volume and the weight of the compressor are favorably reduced, and the cost is greatly reduced.

Specifically, the compression mechanism further includes: the air control valve plate is arranged on the outer peripheral wall of the cylinder to seal the piston cavity, and a second air suction port and a second air exhaust port which are communicated with the piston cavity are formed in the air control valve plate; and the exhaust device is arranged on the air control valve plate and is used for controlling the opening and closing of the second exhaust port.

Optionally, be equipped with the cooperation groove on the accuse gas valve plate, be equipped with on the diapire of cooperation groove the second gas vent, exhaust apparatus is including establishing the discharge valve piece in the cooperation groove.

Optionally, the piston cavity is a circular cavity, and the piston is a matching cylinder; or, the piston cavity is a square cavity, and the piston is a square plate matched with the piston cavity.

The rotary compressor according to an embodiment of the present invention includes: a housing having a first air outlet, a first air return port, a second air outlet, and a second air return port; the compression mechanism is the compression mechanism according to the embodiment of the invention, and is arranged in the shell; the first gas outlet is used for discharging gas compressed in a compression cavity in the compression mechanism, the first gas return port is used for feeding gas into the compression cavity, the second gas outlet is used for discharging gas compressed in a piston cavity in the compression mechanism, and the second gas return port is used for feeding gas into the piston cavity.

According to the rotary compressor provided by the embodiment of the invention, the air displacement of the rotary compressor can be increased, the number of parts can be reduced, the volume and the weight of the compressor can be reduced, and the cost is greatly reduced.

Specifically, the rotary compressor is a single-cylinder compressor, a double-cylinder compressor or a multi-cylinder compressor.

A heat pump apparatus according to an embodiment of the present invention includes: a rotary compressor according to the above embodiment of the present invention; the two heat exchangers are connected with each other, one of the two heat exchangers is connected with the first air outlet, and the other heat exchanger is connected with the first return air port; two throttling elements connected in series between the two heat exchangers; the gas-liquid separation device is connected between the two throttling elements in series and is provided with a separated gas outlet which is connected with the second gas return port; and the second air outlet is connected with the heat exchanger connected with the first air outlet.

According to the heat pump device provided by the embodiment of the invention, not only is the energy-saving effect achieved, but also the cost can be reduced.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic perspective view of a cylinder according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of the layout of the compression mechanism of one embodiment of the present invention;

FIG. 3 is a schematic diagram of the layout of a compression mechanism according to another embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a piston according to one embodiment of the present invention;

FIG. 5 is a schematic, diagrammatic illustration of the layout of a compression mechanism according to yet another embodiment of the present invention;

FIG. 6 is a schematic perspective view of a compression mechanism according to one embodiment of the present invention;

fig. 7 is a schematic structural view of a heat pump apparatus according to an embodiment of the present invention.

Reference numerals:

a heat pump device 1000,

A rotary compressor 100A, a first outlet port 101, a first return port 102, a second outlet port 103, a second return port 104,

Compression mechanism 100, cylinder 1, compression chamber 11, first intake port 111, first exhaust port 112, vane groove 113, piston chamber 12, second intake port 121, second exhaust port 122, communication port 123, communication groove 124, thickened wall 13, roller 2, slide plate 3, piston 4, seal cover 41, piston rod 42, extension edge 43, air control valve plate 51, fitting groove 511, exhaust valve plate 52, piston rod, and piston rod,

The heat exchanger 200, the outdoor heat exchanger 210, the indoor heat exchanger 220, the throttling element 300, the gas-liquid separation device 400, and the separated gas outlet 401.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center," "vertical," "depth," "width," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A cylinder 1 of a rotary compressor according to an embodiment of the present invention will be described with reference to fig. 1 to 2.

According to the cylinder 1 of the rotary compressor of the embodiment of the present invention, as shown in fig. 1 and 2, the cylinder 1 defines the compression chamber 11 for the roller 2 to roll-fit therein, the circumferential wall of the cylinder 1 is provided with the vane groove 113 opened toward the compression chamber 11, and the circumferential wall of the cylinder 1 is provided with the first suction port 111 opened toward the compression chamber 11. The compression chamber 11 and the first suction port 111 and the vane groove 113 are conventional structures of the conventional cylinder. In contrast, the cylinder 1 according to the embodiment of the present invention defines the piston chamber 12 in the circumferential wall, and the piston chamber 12 opens the communication port 123 in the inner circumferential surface of the compression chamber 11. The communication port 123 is an opening of the piston chamber 12 toward the compression chamber 11 here. The hole area of the communication port 123 may be smaller than the sectional area of the piston chamber 12, and the hole area of the communication port 123 may be equal to the sectional area of the piston chamber 12. The piston chamber 12 may be through at an end remote from the communication port 123, in which case the piston chamber 12 corresponds to a through hole in the circumferential wall of the cylinder 1. The piston chamber 12 may not be continuous at the end away from the communication port 123, and in this case, the piston chamber 12 corresponds to a blind hole in the circumferential wall of the cylinder 1. The configuration of the piston chamber 12 may be adjusted as desired.

The piston cavity 12 is arranged in the peripheral wall of the cylinder 1, the compression cavity 11 is still a cylindrical cavity, and the arrangement of the piston cavity 12 does not influence the rolling motion of the roller 2 in the compression cavity 11. When in use, the piston 4 is arranged in the piston cavity 12, and the piston 4 reciprocates by utilizing the rolling of the roller 2, so that the processes of air suction and compression can be completed in the piston cavity 12.

The piston chamber 12 is chosen here to be arranged on the cylinder 1 because the cylinder 1 has a large wall thickness and axial dimensions, which makes sufficient use of space and facilitates direct contact of the piston 4 with the roller 2. If the piston chamber 12 is arranged on the middle partition plate between the bearings or the cylinders, obviously, the structure of the roller 2 for pushing the piston 4 is complicated, the sealing is not easy, and the thickening of the bearings or the cylinders is caused. Similarly, the first suction port 111 is reserved on the cylinder 1, because the suction connection pipe structure does not need to be changed, the whole compressor is slightly changed, and the cost of structural improvement is lower.

The piston chamber 12 is provided in the circumferential wall of the cylinder 1, and the mode of compressing gas by the roller 2 in the compression chamber 11, the mode of air intake and exhaust of the compression chamber 11, the air intake and exhaust cycle, and the like are less affected, but the compression amount of the whole compressor is increased. This way of increasing the amount of compression reduces the number of parts, the volume and weight of the compressor and the cost compared to the way of increasing the number of cylinders.

To further understand the principle of the cylinder 1 increasing the compression amount, the specific structure of the cylinder 1 will be explained in detail when the structure of the compression mechanism 100 is explained.

A compression mechanism 100 of a rotary compressor according to an embodiment of the present invention will be described with reference to fig. 1 to 6.

The compression mechanism 100 according to the embodiment of the present invention, as shown in fig. 2, includes: the cylinder is the cylinder 1 described in the above embodiment, the roller 2 is in rolling fit in the compression cavity 11 of the cylinder 1, the slide sheet 3 is arranged in the slide sheet groove 113 of the cylinder 1 in a reciprocating manner, and the inner end of the slide sheet 3 is connected with the roller 2. A piston 4 is reciprocatingly disposed in a piston chamber 12 of the cylinder 1, and a head of the piston 4 is extendable into the compression chamber 11 and connected to the roller 2.

Here, there are various connection ways of the inner end of the sliding piece 3 and the roller 2, for example, the sliding piece 3 shown in fig. 2 is stopped against the outer circumferential surface of the roller 2 through a spring, and for example, the inner end of the sliding piece 3 can be directly and fixedly connected to the roller 2, or the outer circumferential surface of the roller 2 is provided with a hinge groove, the inner end of the sliding piece 3 is engaged in the hinge groove, and the sliding piece 3 can rotate relative to the roller 2.

When the compression mechanism 100 is operated, the roller 2 rolls along the inner circumferential surface of the compression chamber 11, and the vane 3 engages with the roller 2 to divide the space between the outer circumferential surface of the roller 2 and the inner circumferential surface of the compression chamber 11 into a high pressure chamber and a low pressure chamber since the inner end of the vane 3 is connected to the outer circumferential surface of the roller 2. The compression mechanism 100 has a first suction port 111 and a first discharge port 112, and a low pressure chamber sucks gas from the first suction port 111 and a high pressure chamber pumps compressed gas out from the first discharge port 112.

And the piston 4 is reciprocable in the piston chamber 12 so that the volume of the piston chamber 12 can be reciprocally changed. The compression mechanism 100 has a second suction port 121 and a second discharge port 122 (not shown in fig. 2), and the piston chamber 12 is connected to the second suction port 121 and the second discharge port 122, so that gas can be sucked from the second suction port 121 when the internal volume of the piston chamber 12 becomes large, and gas having a pressure increased can be discharged from the second discharge port 122 when the internal volume of the piston chamber 12 becomes small. Set up piston chamber 12 in the perisporium of cylinder 1, can not increase compressing mechanism 100's axial height under the prerequisite of reasonable setting, cylinder 1 itself wall thickness size is great moreover, and the here sets up piston chamber 12 volume and can satisfy the demand.

Since the head of the piston 4 is connected to the roller 2, during the rolling of the roller 2 in the compression chamber 11, the roller 2 can press on the piston 4, enabling the piston 4 to slide towards the inside of the piston chamber 12 compressing the gas. Here, the dynamic structure of the piston 4 sliding towards the inside of the piston cavity 12 is already determined (i.e. it is pressed by the roller 2) and the dynamic structure of the piston 4 sliding outwards from the inside of the piston cavity 12 is not limited. For example, the head of the piston 4 may be rotatably connected to the roller 2, and for example, a spring or the like may be provided in the piston chamber 12 to urge the piston 4 toward the inside of the compression chamber 11. For example, the piston 4 may be driven by a pressure difference between two sides, and when the pressure in the compression chamber 11 is low, the piston 4 may slide toward the inside of the compression chamber 11 under the driving of the pressure difference between the piston chamber 12 and the compression chamber 11. Of course, the connection modes of the piston 4, the sliding vane 3 and the roller 2 need to be comprehensively considered and cannot interfere with each other.

It should be noted here that, in the embodiment of the present invention, the piston 4 and the sliding vane 3 are different structures, and for each additional sliding vane 3 in the cylinder 1, a first intake port 111 and a first exhaust port 112 for air intake and exhaust to and from the compression chamber 11 need to be added on both sides of the sliding vane 3. The piston 4 is provided with a second air inlet 121 and a second air outlet 122 for air to enter and exit the piston cavity 12. The vane 3 is engaged with the roller 2 for the purpose of dividing the space between the outer circumferential surface of the roller 2 and the inner circumferential surface of the compression chamber 11 into a high pressure chamber and a low pressure chamber, while the piston 4 is provided without participating in the division of the high pressure chamber and the low pressure chamber.

Since the cylinder 1 is separately provided with the piston cavity 12 at a position independent of the compression cavity 11, the gas compression of the piston cavity 12 is completed by the reciprocating motion of the piston 4, and the reciprocating motion of the piston 4 is completed by the roller 2. Here, the movement of the piston 4 does not affect the movement of the roller 2, does not affect the suction and discharge cycles of the compression chamber 11, and does not require a complicated suction and discharge passage.

The compression mechanism 100 of the embodiment of the invention breaks through the pump body structure of the existing rotary compressor, so that the compression of at least two cylinder bodies can be realized by compressing the original single cylinder body, and the combined compression of a main body pump body carrying a small pump body is completed. The piston cavity 12 is formed by the cylinder 1, namely, the compression cavity is formed by the existing parts, so that the structure is compact, the number of parts is reduced, the volume and the weight of the compressor are favorably reduced, and the cost is greatly reduced.

The compression mechanism 100 of the embodiment of the invention is applied to a compressor with compression functions such as independent compression, double-cylinder compression, variable-volume compression and the like. The application of various compression types can be realized, and the cost of the compressor is reduced. The compression mechanism 100 may be externally connected with an air intake and exhaust channel on the piston cavity 12, so that the air intake and exhaust of the piston cavity 12 are directly communicated with the external parts of the compressor. The compression mechanism 100 may also include an air intake/exhaust duct in the cylinder passage, so that the air compressed in the piston chamber 12 can be led to the first air intake 111, or the air compressed in the compression chamber 11 can be led to the second air intake 121, thereby realizing two-stage compression.

Specifically, as shown in fig. 1 and 2, the central axis of the first suction port 111 is located on the same plane as the center line of the piston chamber 12. Colloquially, when the axis of the compression chamber 11 is vertically disposed, the centers of the first suction port 111 and the piston chamber 12 are located at the same height. It can be understood that the reciprocating motion of the piston 4 still has certain impact force on the cylinder 1 and the roller 2, so that the piston cavity 12 is arranged in the middle, which is beneficial to improving the performance.

In some embodiments, the piston chamber 12 is formed to penetrate in the radial direction of the compression chamber 11 in the shape of the communication port 123. Because the piston 4 reciprocates in the piston cavity 12 to complete the compression work, the close fit between the inner wall surface of the piston cavity 12 and the piston 4 needs to be ensured, and the air leakage between the piston cavity 12 and the compression cavity 11 is avoided. In order to ensure smoothness and tightness between the contact surfaces of the piston chamber 12 and the piston 4, and to reduce frictional heat generation, the machining accuracy of the inner wall surface of the piston chamber 12 is required to be high. The difficulty in processing the cylinder 1 can be greatly reduced by forming the piston chamber 12 as a through hole having a shape corresponding to the communication port 123.

In some embodiments, the communication port 123 is disposed adjacent to the first air intake 111, where both the communication port 123 and the first air intake 111 are disposed on the same side of the vane slot 113, and the first air exhaust 112 is disposed on the other side of the vane 3.

It is understood that the outer circumferential surface of the roller 2 is in line contact with the inner circumferential surface of the compression chamber 11, and for the convenience of the following description, the line of contact between the outer circumferential surface of the roller 2 and the inner circumferential surface of the compression chamber 11 is referred to as a separation line. Since the communication port 123 of the piston chamber 12 is provided on the inner circumferential surface of the compression chamber 11, the roller 2 cannot separate both sides of the partition line from ventilation when the partition line moves to the communication port 123.

Taking the example shown in fig. 2 as an example, the roller 2 rolls counterclockwise, and the first exhaust port 112, the vane groove 113, the first intake port 111, and the communication port 123 are provided in this order on the circumferential wall of the cylinder 1 in the counterclockwise direction. The region between the first air intake port 111 and the communication port 123 corresponds to a "dead zone". Specifically, when the roller 2 rotates through the first intake port 111, that is, the partition line is located between the first intake port 111 and the communication port 123, the side through which the first intake port 111 passes is a low-pressure chamber, and the side through which the communication port 123 passes is a high-pressure chamber. When the roller 2 continues to rotate anticlockwise, the low-pressure cavity continues to suck air, the air in the high-pressure cavity continues to be compressed, and the air pressure rises. However, when the dividing line reaches the communication port 123, both sides of the dividing line are communicated by the communication port 123, the gas compressed in the high-pressure chamber flows back to the low-pressure chamber, so that the suction amount is reduced, and the rolling compression of the roller 2 is ineffective in the angle of the dividing line passing through the communication port 123, so that the work is wasted, and the energy efficiency is reduced.

And the communication port 123 is provided adjacent to the first suction port 111, this loss can be reduced. This is because when the communication port 123 is adjacent to the primary suction port 111 and the separation line is located between the communication port 123 and the primary suction port 111, the high pressure chamber just begins to compress and the air pressure is relatively small. When the separation line passes through the communication port 123 thereafter, the gas flowing from the high-pressure chamber to the low-pressure chamber through the communication port 123 is small, the pressure loss is small, and the suction loss to the low-pressure chamber is also reduced.

In addition, in some embodiments, the cylinder 1 has the thickened wall 13 at the portion where the vane groove 113 is provided, and the first intake port 111 is provided adjacent to the vane groove 113, so that the communication port 123 is provided adjacent to the first intake port 111, and the piston chamber 12 can be increased in volume by the thickened wall 13. Even if the exhaust capacity of the piston chamber 12 cannot be increased, the arrangement of the air intake and exhaust structure of the piston chamber 12 can be made much easier.

Specifically, as shown in fig. 2, the first suction port 111 may be located between the communication port 123 and the vane groove 113, and as shown in fig. 3, the communication port 123 may be located between the first suction port 111 and the vane groove 113, which can reduce pressure and suction loss and improve overall performance.

As shown in fig. 1 and 2, a communication groove 124 is provided on the inner circumferential surface of the compression chamber 11, one end of the communication groove 124 extends to the first suction port 111, and the other end of the communication groove 124 extends to the communication port 123. That is, when the separation line moves between the first suction port 111 and the communication port 123, both sides of the separation line are communicated due to the communication groove 124. Thereby further reducing the work loss and the air suction loss.

Also taking the example shown in fig. 2 as an example, the communication groove 124 is provided such that the roller 2 does not decompress the gas in the compression chamber 11 in the process of changing the separation line from the first suction port 111 to the communication port 123 counterclockwise. Since the gas in the compression chamber 11 cannot form a closed compression space through the communication groove 124, it cannot be compressed. Only when the roller 2 has rotated past the communication opening 123 of the piston chamber 12 will a closed high pressure chamber be formed. The gas pressure in the compression chamber 11 starts to rise from this angle after the separation line has rotated through the communication port 123. Thus, no high-pressure gas flows back to the first suction port 111 between the closed high-pressure chambers, and the free movement of the gas is not affected, and the resistance of the oil is not applied. And when the sectional area of the communicating groove 124 is larger, the airflow speed is small, the pressure loss is small, and the efficiency of the compressor is effectively ensured.

Alternatively, the width of the communication groove 124 (i.e., the dimension of the communication groove 124 in the axial direction of the compression chamber 11) is greater than 30% of the height of the cylinder 1 (i.e., the dimension of the cylinder 1 in the axial direction), and the depth of the communication groove 124 is 0.5mm or greater. The arrangement ensures enough ventilation capacity and reduces pressure loss.

Alternatively, the piston chamber 12 is a circular chamber and the piston 4 is a matching cylindrical chamber. The assembly surface is easy to process, and the assembly precision is improved. Moreover, the circular piston cavity 12 is relatively large in accommodation, and the exhaust compression amount of the piston cavity 12 is considerable.

In the example shown in fig. 4, the piston 4 comprises a cover 41, a piston rod 42 and an extension 43, the cover 41 being adapted to the shape of the piston chamber 12, the cover 41 being adapted to seal the piston chamber 12. A piston rod 42 is connected to the cover 41, the piston rod 42 being adapted to be connected to the roller 2, the end face edge of the piston rod 42 may be provided with a chamfer to reduce contact friction. The end surface of the piston rod 42 may be formed in a hemispherical shape to make the contact stress with the roller 2 uniform. The extension edge 43 is connected to the edge of the cover 41 and externally sleeved with the piston rod 42, and the arrangement of the extension edge 43 is beneficial to improving the tightness of the piston cavity 12.

Of course, the shape of the piston chamber 12 of the present embodiment is not limited thereto, and for example, as shown in fig. 5, the piston chamber 12 may be a square chamber and the piston 4 may be a matching square plate. Wherein, of course, the front end of the square plate may be formed into an arc-shaped face to cushion the contact with the roller 2. The piston chamber 12 may also be other shapes, as the design requires.

Also in the example of fig. 1, where the cylinder 1 is formed with the piston chamber 12, the peripheral wall is still a complete ring. However, the structure that the piston cavity 12 is open towards one side or two sides of the end surface of the cylinder 1 is not excluded, and the condition of reasonable sealing can be realized.

In some embodiments, as shown in fig. 6, the compression mechanism 100 further comprises: and the air control valve plate 51, the air control valve plate 51 is arranged on the peripheral wall of the cylinder 1 to seal the piston cavity 12, and the air control valve plate 51 is provided with a second suction port 121 and a second exhaust port 122 which are communicated with the piston cavity 12. Thus, the structure of the cylinder 1 is simplified and the processing is easier.

Specifically, as shown in fig. 6, the compression mechanism 100 further includes an exhaust device provided on the air control valve plate 51, the exhaust device being configured to control opening and closing of the second exhaust port 122.

In an alternative, the exhaust may include an exhaust pipe and a pneumatic control valve connected within the exhaust pipe.

In another alternative, as shown in fig. 6, a fitting groove 511 is provided on the air control valve plate 51, a second air outlet 122 is provided on a bottom wall of the fitting groove 511, and the air outlet device includes an air outlet valve plate 52 provided in the fitting groove 511. The exhaust valve plate 52 controls the exhaust of the piston chamber 12, so that the exhaust is started when the air pressure in the piston chamber 12 reaches the set air pressure. The pressure control mode has simple structure and high reliability. The arrangement of the fitting groove 511 limits the movable range of the discharge valve plate 52, and has a protective effect on the discharge valve plate 52.

Of course, the compression mechanism 100 may also be provided with an air intake device, which is provided on the air control valve plate 51 and controls the opening and closing of the second air inlet 121. The air inlet device may include a check valve for controlling air inlet and may also include an air inlet valve plate, which is not limited herein.

If the compression mechanism 100 is a two-stage compression, the first exhaust port 112 can be connected to the second intake port 121 of the piston chamber 12, and the exhaust gas from the compression chamber 11 is exhausted into the piston chamber 12, so that the secondary compression is performed. Likewise, when two rotary compression chambers 11 exist in the novel compression mechanism 100, a 2 or even 3 piston reciprocating structure can be provided, so that multi-stage compression is realized. If incorporated into an air conditioner system, even multiple compression stages can be implemented along with independent compression functions.

A rotary compressor 100A according to an embodiment of the present invention is described below with reference to fig. 2 and 6.

The rotary compressor 100A according to an embodiment of the present invention includes: a housing having a first gas outlet 101, a first return gas opening 102, a second gas outlet 103 and a second return gas opening 104, and a compression mechanism 100. The compressing mechanism 100 is the compressing mechanism 100 according to the above-mentioned embodiment of the present invention, and the structure of the compressing mechanism 100 is not described herein, and the compressing mechanism 100 is disposed in the housing.

The first gas outlet 101 is used for discharging gas compressed in the compression cavity 11 of the compression mechanism 100, the first gas return port 102 is used for feeding gas into the compression cavity 11, the second gas outlet 103 is used for discharging gas compressed in the piston cavity 12 of the compression mechanism 100, and the second gas return port 104 is used for feeding gas into the piston cavity 12.

Certainly, in the rotary compressor 100A according to the embodiment of the present invention, the housing is a closed housing, the compressor further includes a motor assembly internally disposed in the housing, a rotor in the motor assembly is connected to the roller 2 in the compression mechanism 100 through a crankshaft, and the rotation drives the roller 2 to rotate.

By the arrangement of the compression mechanism 100, the displacement of the rotary compressor 100A can be increased, and the number of parts, the volume and weight of the compressor can be reduced, thereby greatly reducing the cost.

Specifically, the rotary compressor 100A may be a single-cylinder compressor, the rotary compressor 100A may be a double-cylinder compressor, and the rotary compressor 100A may be a multi-cylinder compressor. The rotary compressor 100A may be a fixed frequency compressor and the rotary compressor 100A may be an inverter compressor.

A heat pump apparatus 1000 according to an embodiment of the present invention is described below with reference to fig. 2 and 7.

A heat pump apparatus 1000 according to an embodiment of the present invention, as shown in fig. 7, includes: a rotary compressor 100A, two heat exchangers 200, two throttling elements 300, and a gas-liquid separation device 400. The rotary compressor 100A is the rotary compressor 100A of the above embodiment, and the structure of the rotary compressor 100A has already been described and will not be described herein again. Here, the heat pump apparatus 1000 may be a single-cooler, and the heat pump apparatus 1000 may be a cooler or a warmer. The following description will be given by taking the single-cooler shown in fig. 7 as an example, but the case of cooling and warming can be deduced without any doubt, and will not be described further herein.

As shown in fig. 7, two heat exchangers 200 are connected to each other, one of the two heat exchangers 200 (i.e., the outdoor heat exchanger 210) is connected to the first air outlet 101, and the other of the two heat exchangers 200 (i.e., the indoor heat exchanger 220) is connected to the first air return 102. The two throttling elements 300 are connected in series between the two heat exchangers 200, the gas-liquid separation device 400 is connected in series between the two throttling elements 300, the gas-liquid separation device 400 is provided with a separated gas outlet 401, the separated gas outlet 401 is connected with the second return gas port 104, and the second gas outlet 103 is connected with the heat exchanger 200 (namely, the outdoor heat exchanger 210) connected with the first gas outlet 101.

That is, in the heat pump apparatus 1000, the refrigerant flowing through one throttling element 300 is subjected to gas-liquid separation in the gas-liquid separation device 400, and the separated gas is returned to the rotary compressor 100A instead of entering the other heat exchanger 200 to do useless work, so that the energy efficiency of the heat pump apparatus 1000 is improved.

The second suction port 121 of the piston chamber 12 is connected to a separated gas outlet 401 of the gas-liquid separator 400, and the piston chamber 12 sucks the refrigerant of the intermediate pressure Pm. As shown in fig. 2, when the roller 2 rotates through the piston chamber 12, the piston chamber 12 starts to suck gas, and the suction pressure Pm is greater than the suction pressure Ps of the compression chamber 11, the piston 4 of the piston chamber 12 is pushed to the center of the cylinder, and the head portion thereof is tightly attached to the roller 2. When the roller 2 rotates to the farthest position away from the piston cavity 12, the suction action of the piston cavity 12 is finished, the piston cavity 12 starts to compress, and the roller 2 pushes the piston 4 of the piston cavity 12 to move back (away from the center of the cylinder). When the discharge valve plate 52 of the second discharge port 122 is opened after the compression to the discharge pressure Pd, the gas is discharged from the discharge device to the compressor shell or directly to the front end pipeline of the outdoor heat exchanger 210.

The efficient and energy-saving compression mode reduces the number of parts and greatly reduces the cost.

The construction, e.g., the heat exchanger 200, the throttling element 300, the gas-liquid separator, etc., and the operation of the heat pump apparatus 1000 according to an embodiment of the present invention are well known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (13)

1. A cylinder of a rotary compressor, wherein a compression chamber for rolling fit of rollers is defined in the cylinder, and a sliding vane groove opening toward the compression chamber is provided on the peripheral wall of the cylinder, characterized in that, The peripheral wall of the cylinder is provided with a first suction port, the peripheral wall of the cylinder defines a piston cavity, and the piston cavity is provided with a communication port on the inner peripheral surface of the compression cavity. 2 . The cylinder of the rotary compressor according to claim 1 , wherein the piston cavity is formed by passing through the compression cavity in the shape of the communication port in the radial direction of the compression cavity. 3 . 3 . The cylinder of the rotary compressor according to claim 1 , wherein the central axis of the first suction port and the central axis of the piston cavity are located on the same plane. 4 . 4 . The cylinder of the rotary compressor according to claim 1 , wherein the piston cavity is disposed adjacent to the first suction port, and the first suction port is located between the communication port and the sliding port. 5 . between the vane grooves, or the communication port is located between the first suction port and the sliding vane groove. 5 . The cylinder of the rotary compressor according to claim 1 , wherein a communication groove is provided on the inner peripheral surface of the compression chamber, and one end of the communication groove extends to the first suction port, 6 . The other end of the communication groove extends to the communication port. 6 . The cylinder of the rotary compressor according to claim 5 , wherein the dimension of the communication groove in the axial direction of the compression chamber is greater than 30% of the height of the cylinder, and the depth of the communication groove is greater than 30% of the height of the cylinder. Greater than or equal to 0.5mm. 7. A compression mechanism, characterized in that, comprising: a cylinder, the cylinder is the cylinder according to any one of claims 1-6; a roller, which is rolled and fitted in the compression cavity of the cylinder; a sliding vane, the sliding vane is reciprocatingly arranged in the sliding vane groove of the cylinder, and the inner end of the sliding vane is connected with the roller; The piston is arranged in the piston chamber of the cylinder in a reciprocating manner, and the head of the piston can extend into the compression chamber and is connected with the roller. 8. The compression mechanism of claim 7, further comprising: Air control valve plate, the air control valve plate is arranged on the outer peripheral wall of the cylinder to close the piston cavity, and the air control valve plate is provided with a second air inlet and a second air inlet that communicate with the piston cavity exhaust vent; An exhaust device, the exhaust device is arranged on the air control valve plate, and the exhaust device is used to control the opening and closing of the second exhaust port. 9 . The compression mechanism according to claim 8 , wherein a matching groove is provided on the air control valve plate, and the second exhaust port is provided on the bottom wall of the matching groove. The device includes an exhaust valve plate arranged in the matching groove. 10 . The compression mechanism according to claim 7 , wherein the piston cavity is a circular cavity, and the piston is a matching cylindrical shape; or, the piston cavity is a square cavity, and the piston is a matching cylindrical cavity. 11 . Matching square plates. 11. A rotary compressor, characterized in that, comprising: a housing having a first air outlet, a first air return port, a second air outlet and a second air return port; and, A compression mechanism, the compression mechanism is the compression mechanism according to any one of claims 7-10, and the compression mechanism is provided in the housing; wherein, The first air outlet is used to discharge the compressed gas in the compression chamber of the compression mechanism, the first air return port is used to feed air into the compression chamber, and the second air outlet is used to discharge the compression mechanism The gas compressed in the middle piston cavity, and the second air return port is used for air intake into the piston cavity. 12 . The rotary compressor according to claim 11 , wherein the rotary compressor is a single-cylinder compressor, a double-cylinder compressor or a multi-cylinder compressor. 13 . 13. A heat pump device, comprising: A rotary compressor, the rotary compressor is the rotary compressor according to claim 11 or 12; two heat exchangers, the two heat exchangers are connected, one of the two heat exchangers is connected to the first air outlet, and the other is connected to the first air return port; two throttle elements connected in series between the two heat exchangers; a gas-liquid separation device, the gas-liquid separation device is connected in series between the two throttling elements, the gas-liquid separation device has a separation gas outlet, and the separated gas outlet is connected to the second gas return port; and, The second air outlet is connected to the heat exchanger connected to the first air outlet.

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