CN205135998U - Multi -cylinder rotary compressor and refrigerating system who has it - Google Patents

Abstract

The utility model discloses a multi-cylinder rotary compressor and a refrigeration system with the compressor. The multi-cylinder rotary compressor includes: a casing, which defines a closed space inside the casing; a compression mechanism, which is arranged in the closed space, and the compression mechanism includes: a plurality of cylinders, a crankshaft , a plurality of pistons and a plurality of sliding plates, the crankshaft is provided with a plurality of eccentric parts, the plurality of pistons are respectively sleeved on the plurality of eccentric parts, and the plurality of pistons are respectively rotatably arranged on the plurality of eccentric parts. In the plurality of cylinders, the plurality of slides are respectively slidably arranged in the plurality of cylinders and respectively abutted against the corresponding pistons, and the plurality of cylinders have at least two different displacements And the bore diameter of the cylinder with the smallest displacement is the smallest. The multi-cylinder rotary compressor according to the embodiment of the utility model has high energy efficiency and good performance.

Description

Multi-cylinder rotary compressor and refrigeration system having same

technical field

The utility model relates to the technical field of compressors, in particular to a multi-cylinder rotary compressor and a refrigeration system with the multi-cylinder rotary compressor.

Background technique

Among the rotary compressors, there are single-cylinder and double-cylinder (multi-cylinder) structures. The single-cylinder compressor has a relatively simple structure and low cost, but due to its structural characteristics, it has the problem of large fluctuations in eccentric mass and compression torque, especially as the speed increases, its vibration is also significantly worsened. Therefore, there are limitations in adopting a single-cylinder structure in a large-displacement inverter compressor. In order to overcome the problem of torque fluctuation, the structure of double cylinders or multi-cylinders is adopted in related technologies. Through the force balance between multiple cylinders, the operation vibration of the compressor is reduced, which is more suitable for the needs of high-frequency operation.

With the technical development of compressors, the miniaturization design with low cost advantages has become one of the important directions of rotary compressor design. However, with the reduction of the size of the compressor casing, there are also restrictions on the structure of the compressor pump body. In the related art, the structure of the upper and lower cylinders in the double-cylinder compressor is generally designed symmetrically, which has the advantage of reducing the torque fluctuation to the greatest extent and reducing the vibration of the compressor. However, this design is difficult to take advantage of the energy efficiency of the two-cylinder compressor, and the size of the upper and lower cylinders is constrained by the inner diameter of the shell, making it difficult to achieve optimal performance.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the utility model proposes a multi-cylinder rotary compressor, which has high energy efficiency and good performance.

The utility model also proposes a refrigeration system with the multi-cylinder rotary compressor.

According to the multi-cylinder rotary compressor of the present invention, it includes: a casing, which defines a closed space inside the casing; a compression mechanism, which is arranged in the closed space, and the compression mechanism includes: a plurality of A cylinder, a crankshaft, a plurality of pistons and a plurality of sliding plates, the crankshaft is provided with a plurality of eccentric parts, the plurality of pistons are respectively sleeved on the plurality of eccentric parts, and the plurality of pistons are respectively rotatable provided in the plurality of cylinders, the plurality of slides are respectively slidably arranged in the plurality of cylinders and respectively abutted against the corresponding pistons, and the plurality of cylinders have at least two different The cylinder with the smallest displacement has the smallest bore diameter.

According to the multi-cylinder rotary compressor of the present invention, by providing at least two types of displacements of the plurality of cylinders, it is possible to realize efficient design of the compressor. On the one hand, the cylinder with a small displacement has a small bore, and the cylinder with a large displacement has a relatively large bore, so that when the compressor is started, the cylinder with a small displacement (the one with the smallest bore) can be used. Cylinder) to establish the pressure in the compressor housing. When the pressure in the housing rises to a predetermined value, the cylinder with a large bore diameter can be used normally to meet the overall displacement of the compressor. In this way, the energy efficiency of the cylinder with a smaller displacement is slightly lower, but due to the smaller displacement, the impact on the overall energy efficiency of the compressor is also small, so that the advantages of high energy efficiency of the cylinder with a large displacement can be fully utilized, and the multi-cylinder rotary compressor can be improved. The energy efficiency level of the compressor as a whole, realizes the high efficiency of the compressor on the basis of miniaturization.

In some preferred embodiments, the cylinder with the smallest displacement has the smallest cylinder height.

In some preferred embodiments, the cylinder heights of the plurality of cylinders are equal.

In some preferred embodiments, the plurality of cylinders are arranged at intervals along the vertical direction, and the cylinder with the smallest displacement is located at the bottom.

In some preferred embodiments, the plurality of cylinders are arranged at intervals along the vertical direction, and the cylinder with the largest displacement is located at the bottom.

In some preferred embodiments, a spring is provided at the tail of the slide in the cylinder with the smallest displacement.

In some preferred embodiments, the displacement of the cylinder with the smallest displacement accounts for less than or equal to 35% of the total displacement of the compressor.

In some preferred embodiments, there are two cylinders and include a first cylinder and a second cylinder, and the displacement of the first cylinder is smaller than that of the second cylinder.

In some preferred embodiments, a spring is provided at the tail of the slide in the first cylinder.

The refrigeration system according to the embodiment of the second aspect of the utility model includes the multi-cylinder rotary compressor mentioned above. Since the multi-cylinder rotary compressor according to the embodiment of the present invention has the above advantages, the refrigeration system has corresponding advantages, namely, the refrigeration system has the advantages of high energy efficiency and good performance.

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

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a structural schematic diagram of a compression mechanism of a multi-cylinder rotary compressor according to an embodiment of the present invention.

Reference signs:

compression mechanism 100;

cylinder 1; first cylinder 11; second cylinder 12;

crankshaft 3; eccentric part 31;

Piston 4; Sliding plate 5; Lower bearing 6; Upper bearing 7; Partition plate 8; Spring 9.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In describing the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" etc. indicate orientation Or the positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be configured in a specific orientation, and operation, and therefore cannot be construed as a limitation of the utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, "plurality" means two or more, unless otherwise specifically defined.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Disconnected connection, or integral connection; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The following describes a multi-cylinder rotary compressor according to an embodiment of the present invention with reference to FIG. 1 . As shown in FIG. 1 , the multi-cylinder rotary compressor according to the embodiment of the present invention includes a casing (not shown in the figure) and a compression mechanism.

A closed space is defined in the casing, and the compression mechanism is arranged in the closed space in the casing. The compression mechanism includes: a plurality of cylinders 1 , a crankshaft 3 , a plurality of pistons 4 and a plurality of slide plates 5 .

A plurality of cylinders 1 can be arranged at intervals along the vertical direction, and a partition 8 is arranged between two adjacent cylinders 1 . An upper bearing 7 may be provided above the uppermost cylinder 1 , and a lower bearing 6 may be provided below the lowermost cylinder 1 . Each cylinder 1 defines a cylinder hole, and a plurality of pistons 4 are respectively rotatably arranged in the cylinder holes of the plurality of cylinders 1 . Each cylinder 1 is also formed with an intake port, through which the refrigerant can enter the cylinder bore, and the piston 4 rotates eccentrically in the cylinder bore, thereby compressing the refrigerant sucked into the cylinder bore, and then discharged from the compressor .

The crankshaft 3 may extend in the up and down direction, and pass through the cylinder bores of each cylinder 1, respectively. Also be provided with motor in the casing, crankshaft 3 is fixedly matched with the rotor of motor, so that utilize motor to drive crankshaft 3 to rotate. The crankshaft 3 is provided with a plurality of eccentric parts 31 , and the plurality of pistons 4 are sleeved on the plurality of eccentric parts 31 respectively. When the crankshaft 3 rotates, the pistons 4 can be driven to rotate in the cylinder bore.

A plurality of sliding pieces 5 are respectively slidably arranged in a plurality of cylinders 1 and respectively abutted against corresponding pistons 4. Specifically, each cylinder 1 is provided with a sliding piece 5 groove, and the sliding pieces 5 are slidably arranged on Slider 5 slots. It should be explained that the end of the sliding plate 5 abutting against the piston 4 is called the head of the sliding plate 5 , and the end of the sliding plate 5 away from the piston 4 is called the tail of the sliding plate 5 .

The plurality of cylinders 1 have at least two different displacements, and the cylinder 1 with the smallest displacement has the smallest bore diameter. It should be noted that a plurality of cylinders 1 means that the number of cylinders 1 may be two or more.

When the number of cylinders 1 is two, the displacements of the two cylinders 1 are different, and the bore of the cylinder 1 with a small displacement (ie the diameter of the cylinder bore) is smaller than the bore of the cylinder 1 with a large displacement.

When the number of cylinders 1 is more than two, the displacement of at least one of the multiple cylinders 1 is different from that of other cylinders 1, and the displacements of other cylinders 1 can be the same or different, of course Compared with other cylinders 1, each cylinder 1 among the plurality of cylinders 1 may have a different displacement. When the number of cylinders 1 is two or more, the bore diameter of the cylinder 1 with a small displacement (that is, the diameter of the cylinder bore) is the smallest among the plurality of cylinders 1 .

According to the multi-cylinder rotary compressor of the embodiment of the present invention, by making the displacement of the plurality of cylinders 1 have at least two types, it is possible to realize the high-efficiency design of the compressor. On the one hand, the bore diameter of the cylinder 1 with a small displacement is relatively small, and relatively speaking, the design of the bore diameter of the cylinder 1 with a large displacement is relatively large, so that when the compressor is started, the cylinder 1 with a small displacement can be used ( The cylinder 1 with the smallest bore diameter builds up the pressure in the compressor casing. When the pressure in the casing rises to a predetermined value, the cylinder 1 with a large bore diameter can be used normally, thereby satisfying the overall displacement of the compressor. In this way, the energy efficiency of the cylinder 1 with a smaller displacement is slightly lower, but due to the smaller displacement, the impact on the overall energy efficiency of the compressor is also small, so that the high energy efficiency advantage of the large displacement cylinder 1 can be fully utilized to improve the performance of multiple cylinders. The overall energy efficiency level of the rotary compressor realizes the high efficiency of the compressor on the basis of miniaturization.

On the other hand, the inner diameter of the cylinder 1 with a larger displacement is designed to be larger, and the spring 9 at the tail of the slide plate 5 in the prior art can be eliminated in the cylinder 1 with a larger displacement, so that the cylinder 1 can meet the exhaustion requirements. At the same time, the cylinder height can be reduced by increasing the cylinder diameter, which can slow down the leakage of the cylinder 1, thereby further improving the overall energy efficiency of the compressor.

In some embodiments of the present invention, the displacement of cylinder 1 with the smallest displacement accounts for less than or equal to 35% of the total displacement of the compressor. In other words, the proportion of the displacement of the cylinder 1 with the smallest displacement to the total displacement of the compressor is less than 35%, or the proportion of the displacement of cylinder 1 with the smallest displacement to the total displacement of the compressor is equal to 35% %. In this way, the impact of the cylinder 1 with the smallest displacement on the overall energy efficiency of the compressor can be reduced, and the purpose is to give full play to the improvement effect of the energy efficiency of the cylinder 1 with a larger displacement on the overall energy efficiency of the compressor.

Preferably, the displacement of cylinder 1 with the smallest displacement can be further reduced, for example, the ratio of the displacement of cylinder 1 with the smallest displacement to the total displacement of the compressor can be designed to be less than or equal to 30%, In this way, the impact of the cylinder 1 with the smallest displacement on the overall energy efficiency of the compressor can be further reduced.

Optionally, cylinder 1 with the smallest displacement has the smallest cylinder height. Correspondingly, the cylinder height of the cylinder 1 with a larger displacement is designed to be larger, so that the volume of the cylinder hole in the cylinder 1 with a larger displacement can be further increased, thereby further improving the exhaust gas of the cylinder 1 with a large displacement. volume, which in turn can improve the energy efficiency of the large displacement cylinder 1.

Of course, optionally, the cylinder heights of the plurality of cylinders 1 can be equal, thereby making the installation and arrangement of the plurality of cylinders 1 in the housing simpler.

Optionally, a plurality of cylinders 1 are arranged at intervals along the vertical direction, and the cylinder 1 with the smallest displacement is located at the bottom. Correspondingly, the cylinder 1 with a large displacement can be arranged above the cylinder 1 with a small displacement, thereby facilitating the force balance of the compression mechanism and reducing the vibration of the compressor.

Certainly, a plurality of cylinders 1 are arranged at intervals along the vertical direction, and the cylinder 1 with the largest displacement is located at the bottom. Therefore, the large displacement cylinder 1 is closer to the bottom oil pool of the compressor, thereby improving the lubrication and sealing effect, further improving the performance of the large displacement cylinder 1, and further improving the energy efficiency and performance of the compressor.

In some embodiments of the present utility model, a spring 9 is provided at the tail of the sliding plate 5 in the cylinder 1 with the smallest displacement, thus, when the compressor is started and the cylinder 1 with a small displacement is used to establish the compressor interior At this time, there may be a collision between the slide plate 5 and the piston 4, resulting in collision noise. By providing a spring 9 at the tail of the slide 5 in the cylinder 1 with the smallest displacement, the spring 9 can be used to generate a driving force on the tail of the slide 5, thereby avoiding the transition between the piston 4 and the slide 5 Collision, which in turn can reduce the noise of the compressor.

Preferably, no spring 9 is provided at the end of the sliding plate 5 in the cylinder 1 with a large displacement, which can ensure the tight fit between the sliding plate 5 and the piston 4 through the pressure inside the compressor, thereby avoiding the limited design of the spring 9 problem of miniaturization. In this way, the cylinder hole in the cylinder 1 with a larger displacement can be further enlarged, thereby expanding the displacement of the cylinder 1, and further improving the overall energy efficiency of the compressor.

A preferred embodiment of the present invention will be described below with reference to FIG. 1 . The compressor shown in Figure 1 is a two-cylinder rotary compressor. The compressor includes a casing (not shown in the figure) and a compression mechanism 100 .

As shown in FIG. 1 , the compression mechanism 100 includes two cylinders, a crankshaft 3 , two pistons 4 and two slide plates 5 . The two cylinders are respectively the first cylinder 11 and the second cylinder 12. The crankshaft 3 is provided with two eccentric parts 31, and the two pistons 4 are sleeved on the two eccentric parts 31 respectively. Inside the first cylinder 11 and the second cylinder 12.

A lower bearing 6 is provided below the first cylinder 11 , an upper bearing 7 is provided above the second cylinder 12 , and a partition 8 is provided between the first cylinder 11 and the second cylinder 12 .

Wherein the exhaust volume of the first cylinder 11 is smaller than that of the second cylinder 12 , correspondingly, the bore diameter of the first cylinder 11 is smaller than the bore diameter of the second cylinder 12 . When the compressor starts, only the first cylinder 11 can be made to work, and the second cylinder 12 can not be started. At this time, the first cylinder 11 with a small displacement can be used to build up the pressure inside the compressor, that is to say, after the first cylinder 11 is operated for a period of time, the pressure of the refrigerant gas is increased and then discharged into the housing, so that the After the pressure inside the housing reaches the activation pressure of the second cylinder 12, the second cylinder 12 can be made to work again.

As shown in Figure 1, the tail of the slide 5 in the first cylinder 11 is provided with a spring 9, so that the spring 9 can be used to generate a driving force on the tail of the slide 5 in the first cylinder 11, thereby preventing the piston 4 from The transitional collision with the sliding vane 5 can reduce the noise of the compressor.

Preferably, no spring 9 may be provided at the tail of the slide 5 inside the second cylinder 12 . Therefore, the cylinder height can be reduced by increasing the bore diameter of the second cylinder 12 while satisfying the displacement, and the leakage of the second cylinder 12 can be slowed down, so that the overall energy efficiency of the compressor can be further improved.

In the example shown in FIG. 1 , the first cylinder 11 is located below the second cylinder 12 , thereby facilitating the force balance of the compression mechanism 100 and reducing the vibration of the compressor. Wherein, the cylinder height of the first cylinder 11 is equal to the cylinder height of the second cylinder 12 , thus facilitating the arrangement of the second cylinder 12 and the second cylinder 12 in the housing more simply.

The utility model also proposes a refrigeration system, which at least includes a multi-cylinder rotary compressor as described above in the utility model, a high-pressure heat exchanger, a throttling device and a low-pressure heat exchanger, a compressor, a high-pressure heat exchanger , throttling device and low-pressure heat exchanger are connected end to end in order to form a refrigerant cycle.

Since the multi-cylinder rotary compressor according to the embodiment of the present invention has the above advantages, the refrigeration system has corresponding advantages, namely, the refrigeration system has the advantages of high energy efficiency and good performance.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation Specific features, structures, materials or characteristics described in an embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A multi-cylinder rotary compressor, characterized in that, comprising: A casing, defining a closed space inside the casing; A compression mechanism, the compression mechanism is arranged in the enclosed space, the compression mechanism includes: a plurality of cylinders, a crankshaft, a plurality of pistons and a plurality of sliding plates, the crankshaft is provided with a plurality of eccentric parts, and the plurality of The two pistons are respectively sleeved on the plurality of eccentric parts, and the plurality of pistons are respectively rotatably arranged in the plurality of cylinders, and the plurality of slide plates are respectively slidably arranged in the plurality of cylinders. and stop against the corresponding pistons respectively, the plurality of cylinders have at least two different displacements, and the cylinder with the smallest displacement has the smallest bore diameter. 2. The multi-cylinder rotary compressor according to claim 1, wherein the cylinder with the smallest displacement has the smallest cylinder height. 3. The multi-cylinder rotary compressor according to claim 1, wherein the cylinder heights of the plurality of cylinders are equal. 4. The multi-cylinder rotary compressor according to claim 1, wherein the plurality of cylinders are arranged at intervals along the vertical direction, and the cylinder with the smallest displacement is located at the bottom. 5. The multi-cylinder rotary compressor according to claim 1, wherein the plurality of cylinders are arranged at intervals along the vertical direction, and the cylinder with the largest displacement is located at the bottom. 6. The multi-cylinder rotary compressor according to claim 1, wherein a spring is provided at the tail of the sliding vane in the cylinder with the smallest displacement. 7. The multi-cylinder rotary compressor according to any one of claims 1-6, characterized in that the proportion of the displacement of the cylinder with the smallest displacement to the total displacement of the compressor is less than Or equal to 35%. 8. The multi-cylinder rotary compressor according to claim 1, characterized in that, there are two cylinders and include a first cylinder and a second cylinder, and the displacement of the first cylinder is smaller than that of the second cylinder. The displacement of the cylinder. 9. The multi-cylinder rotary compressor according to claim 8, wherein a spring is provided at the tail of the sliding vane in the first cylinder. 10. A refrigeration system, characterized by comprising the multi-cylinder rotary compressor according to any one of claims 1-9.