Rotary compressor

Abstract

A rotary compressor, comprising: a housing; an electric motor, a cylinder and a crankshaft, which are accommodated within the housing, wherein the cylinder is provided with a gas discharge port (7), a vane slot, and a vane, and the crankshaft transmits a rotational force of the electric motor to a piston, causing the piston to rotate within the cylinder to compress a refrigerant; and a gas injection line (6) connected to a compression chamber. In the cross-section perpendicular to the rotational axis of the electric motor, a first projection point of the center of the gas discharge port (7) on the cross-section forms a first connecting line together with a second projection point of the rotational axis of the electric motor on the cross-section, and a third projection point of the center of a gas injection port (62) of the gas injection line (6) on the cross-section forms a second connecting line together with the second projection point; an included angle θ is formed between the first connecting line and the second connecting line, the value range of θ being 11°≤θ≤100°. The rotary compressor can maintain a substantially constant gas injection volume under different operating conditions, while improving the compressor operating capacity, thereby ensuring both the energy efficiency of the compressor and the adaptability to different operating conditions.

Description

Rotary compressor TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration equipment, in particular to a rotary compressor with large displacement and small shell diameter. BACKGROUND

[0002] The compressor is the core component of the refrigeration system, and the performance of the compressor determines the capacity of the refrigeration system. When the compressor works in a low-temperature environment, the operating pressure of the compressor is relatively large, and the capacity / energy efficiency is seriously reduced. In order to improve the capacity / energy efficiency of the compressor, the injection air supply mode is usually adopted. The angle between the air supply port and the exhaust port has different effects on the capacity of the compressor. When the angle is within a suitable range, the capacity of the compressor is optimal. The angle between the air supply port and the exhaust port can be controlled to improve the capacity of the compressor. SUMMARY

[0003] In view of the problems in the prior art, the present application aims to provide a rotary compressor which overcomes the difficulties of the prior art, maintains the air supply amount basically unchanged under different working conditions, improves the operating capacity of the compressor, and balances the energy efficiency of the compressor and the adaptability to different working conditions.

[0004] The present application provides a rotary compressor, comprising:

[0005] a shell;

[0006] a motor, a cylinder, and a crankshaft, which are accommodated in the shell, the cylinder has an exhaust port, a sliding vane groove, and a sliding vane, and the crankshaft transmits the rotating force of the motor to a piston to make the piston rotate in the cylinder to compress refrigerant;

[0007] an air supply pipeline connected to a compression chamber, in a cross section perpendicular to the rotating shaft of the motor, the center point of the exhaust port is based on a first projection point of the cross section and the rotating shaft of the motor is based on a second projection point of the cross section to form a first connecting line, the center point of the air supply port of the air supply pipeline is based on a third projection point of the cross section and the second projection point to form a second connecting line, and an included angle θ is formed between the first connecting line and the second connecting line, and the value of θ is in the range of 11°≤θ≤100°.

[0008] Optionally, the cylinder comprises an upper cylinder and a lower cylinder, and each of the upper cylinder and the lower cylinder has an exhaust port, a sliding vane groove, and a sliding vane;

[0009] two pistons rotatably arranged in the upper cylinder and the lower cylinder, respectively;

[0010] The crankshaft has two eccentric parts, and the crankshaft transmits the rotating force of the motor to the two pistons, and the two eccentric parts drive the two pistons to rotate in the respective cylinders.

[0011] Optionally, further comprising:

[0012] An upper bearing assembly is arranged above the upper cylinder and connected to the inner wall of the housing.

[0013] An intermediate plate is arranged between the upper cylinder and the lower cylinder, and the upper bearing assembly and the intermediate plate clamp the upper cylinder to form an upper compression chamber.

[0014] A lower bearing assembly is arranged below the lower cylinder, and the lower bearing assembly and the intermediate plate clamp the lower cylinder to form a lower compression chamber.

[0015] Optionally, the air supplement port is a pipeline, the extension direction of the pipeline is parallel to the rotation axis direction of the motor, and the value range of θ is 11°≤θ≤40°.

[0016] Optionally, the value range of θ is 20°≤θ≤30°.

[0017] Optionally, the air supplement pipeline is arranged in the upper cylinder, and the air supplement pipeline further comprises:

[0018] A radial pipe is arranged in the side wall of the upper cylinder, a first end of the radial pipe is exposed to the outer surface of the side wall of the upper cylinder, and a second end of the radial pipe is connected to the upper end of the air supplement port.

[0019] Optionally, further comprising:

[0020] An inlet is arranged at the bottom of the inner side of the side wall of the upper cylinder and is connected to the lower end of the air supplement port.

[0021] Optionally, the air supplement pipeline is arranged in the upper bearing assembly, and the air supplement pipeline further comprises:

[0022] A radial pipe is arranged in the upper bearing assembly, a first end of the radial pipe is exposed to the outer wall surface of the upper bearing assembly, and a second end of the radial pipe is connected to the upper end of the air supplement port.

[0023] Optionally, the lower end of the air supplement port is connected to the top surface of the upper compression chamber.

[0024] Optionally, the air supplement pipeline is arranged in the intermediate plate, and the air supplement pipeline further comprises:

[0025] A radial pipe is arranged in the intermediate plate, a first end of the radial pipe is exposed to the outer wall surface of the intermediate plate, and a second end of the radial pipe is connected to the middle part of the air supplement port, and the upper end and the lower end of the air supplement port are respectively connected to the bottom surface of the upper compression chamber and the top surface of the lower compression chamber.

[0026] Optionally, the upper end and the lower end of the air supplement port are respectively provided with air supplement cavities, and each air supplement cavity is respectively provided with an air supplement valve.

[0027] In summary, the rotor compressor of the present application can maintain the air supplement amount basically unchanged under different working conditions, and improve the compressor operation capacity, and balance the compressor energy efficiency and the adaptability to different working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0028] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof, read in conjunction with the accompanying drawings.

[0029] Fig. 1 is a partial sectional view of a first rotor compressor of the present application.

[0030] Fig. 2 is an enlarged view of a portion of Fig. 1.

[0031] Fig. 3 is a first sectional view of an upper cylinder of Fig. 1.

[0032] Fig. 4 is a second sectional view of the upper cylinder of Fig. 1.

[0033] Fig. 5 is a schematic view of a comparison of compressor capacity between the first rotor compressor of the present application and a compressor without air supplement port.

[0034] Fig. 6 is a partial sectional view of a second rotor compressor of the present application.

[0035] Fig. 7 is an enlarged view of a portion of Fig. 6.

[0036] Fig. 8 is a partial sectional view of a third rotor compressor of the present application.

[0037] Fig. 9 is an enlarged view of a portion of Fig. 8.

[0038] Fig. 1 is a partial sectional view of a first rotor compressor of the present application. DETAILED DESCRIPTION

[0039] Other advantages and embodiments of the present application will be more readily appreciated when the description is read in conjunction with the accompanying drawings. The following description of the embodiments of the present application is provided as an example of the application and is not intended to limit the application, as defined in the appended claims, in which reference numerals are generally consistent within the drawings, in which:

[0040] In the description of the present application, expressions such as "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present application. Moreover, the appearance of such expressions in different places in the description or claims does not exclude that some embodiments include the same feature, structure, material, or characteristic. In addition, when a particular feature, structure, material, or characteristic is described in connection with an embodiment or example, it will be understood that this feature, structure, material, or characteristic can be employed in any other embodiment or example, unless there are specific contraindications.

[0041] In addition, the terms "first", "second", etc., are used herein only to describe various elements, and do not imply or suggest relative importance or a number of the elements indicated. Thus, features defined with "first", "second", etc., can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is two or more, unless specifically limited otherwise.

[0042] In order to clearly illustrate the present application, elements irrelevant to the description are omitted, and the same or similar elements throughout the description are designated by the same reference numerals.

[0043] Throughout the description, when it is said that an element is "connected" to another element, this includes not only a case where it is "directly connected" but also a case where other elements are interposed therebetween and "indirectly connected". In addition, when it is said that an element "includes" a certain constituent element, unless specifically stated to the contrary, other constituent elements are not excluded but it means that other constituent elements can also be included.

[0044] When it is said that an element is "on" another element, this can be directly on the other element, but can also be accompanied by other elements therebetween. When it is said that an element is "directly on" another element, there are no other elements therebetween.

[0045] The meaning of "including," "comprising," and "having" as used herein is taken to specify the presence of stated features, steps, operations, elements, components, items, and / or groups but does not preclude the presence or addition of one or more other features, steps, operations, elements, components, items, and / or groups. As used herein, the term "or" is construed as inclusive or, meaning either, any, or any combination of the items, categories, and / or groups. Thus, "A, B, or C" or "A, B, and / or C" means any of the following: A; B; C; A and B; A and C; B and C; A, B, and C. Exceptions to this definition apply only when the combination of elements, functions, steps, or acts are in some way inherently mutually exclusive.

[0046] The professional and technical terms used herein are intended to refer to specific embodiments and are not intended to limit the application. As used herein, the singular form "a," "an," and "the" include plural references unless the context clearly dictates otherwise. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0047] Although not differently defined, technical and scientific terms used herein include the technical terms and scientific terms commonly used in the art to which the present application pertains. Terms defined in commonly used dictionaries are to be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and are not to be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0048] Figure 1 is a partial sectional view of a first kind of rotary compressor according to the present application. Figure 2 is an enlarged view of a portion of Figure 1. Figure 3 is a first kind of sectional view of the upper cylinder of Figure 1. Figure 4 is a second kind of sectional view of the upper cylinder of Figure 1. As shown in Figures 1 to 4, the rotary compressor according to the present application, including (hereinafter, a double-cylinder rotary compressor will be described as an example, but the present application is not limited thereto) a housing, a motor, an upper cylinder 2, a lower cylinder 4, two pistons, a crankshaft, and a charge pipe 6. The motor, the upper cylinder 2, and the lower cylinder 4 are accommodated in the housing, and the upper cylinder 2 and the lower cylinder 4 each have a discharge port 7, a vane groove, and a vane. The two pistons are rotatably provided in the upper cylinder 2 and the lower cylinder 4, respectively. The crankshaft has two eccentric portions, and the crankshaft transmits a rotational force of the motor to the two pistons, and the two eccentric portions respectively rotate the two pistons in the respective cylinders to compress a refrigerant. The charge pipe 6 is connected to a compression chamber, and in a cross section perpendicular to a rotational axis of the motor, a center point of the discharge port 7 and a center point of a charge port 62 of the charge pipe 6 form a first line L1 and a second line L2, respectively, and an included angle θ between the first line L1 and the second line L2 is in a range of 11° ≤ θ ≤ 100°. The θ of Figure 3 is 95°. The θ of Figure 4 is 25°.

[0049] In an alternative embodiment, the rotary compressor further includes an upper bearing assembly 1, an intermediate plate 3, and a lower bearing assembly 5. The upper bearing assembly 1 is provided above the upper cylinder 2 and is connected to an inner wall of the housing. The intermediate plate 3 is provided between the upper cylinder 2 and the lower cylinder 4, and the upper bearing assembly 1 and the intermediate plate 3 sandwich the upper cylinder 2 to form an upper compression chamber. The lower bearing assembly 5 is provided below the lower cylinder 4, and the lower bearing assembly 5 and the intermediate plate 3 sandwich the lower cylinder 4 to form a lower compression chamber, but the present application is not limited thereto.

[0050] In an alternative embodiment, the charge port 62 is a pipe, and an extension direction of the pipe is parallel to a direction of the rotational axis of the motor, but the present application is not limited thereto.

[0051] In an alternative embodiment, the charge pipe 6 is provided in the upper cylinder 2, and the charge pipe 6 further includes a radial pipe 61 provided in a side wall of the upper cylinder 2, a first end of the radial pipe 61 being exposed to an outer surface of the side wall of the upper cylinder 2, and a second end of the radial pipe 61 being connected to an upper end of the charge port 62, but the present application is not limited thereto.

[0052] In an alternative embodiment, the rotary compressor further includes an inlet 63 provided at a bottom of an inner side of the side wall of the upper cylinder 2 and connected to a lower end of the charge port 62, but the present application is not limited thereto.

[0053] Referring to Figs. 1 to 4, the present application provides a rotary compressor, which comprises a compression mechanism arranged in a housing cavity, the compression mechanism comprising a motor, two pistons, a crankshaft, an upper bearing assembly 1, an upper cylinder 2, an intermediate plate 3, a lower cylinder 4, a lower bearing assembly 5, and a charge air passage 6. The bearing assemblies are arranged on both axial sides of the cylinder assembly, the upper cylinder 2 and the lower cylinder 4 each comprising a compression chamber, and the pistons are arranged in the compression chambers and roll along the inner walls of the compression chambers. The charge air passage 6 is arranged in the compression mechanism and used for injecting refrigerant into the compression chambers. One end of the charge air passage 6 is connected to the outside of the housing through a radial pipe 61, and one end of the charge air passage 6 is provided with a charge air port 62 for communicating with the compression chambers, but this is not limited. The charge air passage in the present application can be arranged on any one of the compression mechanism, the cylinder assembly, the intermediate plate, the bearing, etc., and the charge air port can be arranged on any one of the two surfaces of any one of the compression mechanisms that can form the compression chambers or any one of the upper and lower single surfaces. In a cross section perpendicular to the rotating shaft of the motor, the center point of the exhaust port 7 and the rotating shaft of the motor form a first connecting line L1 based on the first projection point of the cross section and the second projection point of the cross section, respectively, the center point of the charge air port 62 and the second projection point of the cross section form a second connecting line L2 based on the third projection point of the cross section, and the first connecting line L1 and the second connecting line L2 form an included angle θ, which satisfies 11°≤θ≤100°. The charge air port in the present application can be directly communicated with the compression chamber, or a charge air valve can be arranged at the charge air passage or the charge air port to control the communication with the compression chamber by opening and closing the charge air valve. When the charge air valve is arranged at the charge air passage or the charge air port, the charge air valve can be of any form and any material.

[0054] Figure 5 is a schematic diagram of the compressor capacity of a rotor compressor of the present application compared with a compressor without a port. In an alternative embodiment, as shown in Figure 5, where the curve G is a graph of the compressor capacity of the rotor compressor of the present application as a function of θ, and the straight line H is a graph of the compressor capacity of a compressor without a port. The provision of the porting channel and the port in the compressor affects the amount of porting during compression and the effect of the porting channel clearance volume on the compression process. If the port is too close to the discharge port, the amount of porting can be reduced under low pressure ratio conditions; if the port is too far from the discharge port, the amount of porting can be reduced under high pressure ratio conditions, so the position of the port relative to the discharge port needs to be controlled properly. When the angle θ between the port and the discharge port satisfies 11°≤θ≤100°, the compressor capacity shows different trends, and is greater than the compressor capacity without porting in general. In particular, when 11°≤θ≤40°, the compressor capacity is in an optimal range. As can be seen from the graph, in contrast to the optimal range, when 0°<θ<11° and 40°<θ≤100°, the compressor capacity decreases relative to the optimal point, but is still higher than the compressor capacity without the port, but not limited thereto. The compressor capacity in this embodiment refers to the amount of refrigerant compressed in the compressor per unit time, i.e. the refrigerating or heating capacity per unit time. The difference between the compressor capacity and the compressor efficiency is that the compressor efficiency is obtained by capacity / power, and the compressor capacity does not take power into account.

[0055] In an alternative embodiment, referring to Figure 5, when the value of θ is in the range of 20°≤θ≤30°, the compressor capacity can reach a peak, but not limited thereto.

[0056] Figure 6 is a partial cross-sectional view of a second rotor compressor of the present application. Figure 7 is an enlarged view of a portion of Figure 6. As shown in Figures 6 and 7, the second rotor compressor of the present application differs from the first rotor compressor in that the position and structure of the porting channel 6 are different. In the second rotor compressor, the porting channel 6 is provided in the upper bearing assembly 1, and the porting channel 6 further comprises a radial pipe 61 provided in the upper bearing assembly 1, the first end of the radial pipe 61 being exposed on the outer wall surface of the upper bearing assembly 1, and the second end being communicated with the upper end of a port 62. The lower end of the port 62 is communicated with the top surface of the upper compression chamber. When the refrigerant flows from the upper bearing assembly 1 to the port 62 (directly communicated with the compression chamber) through the radial pipe 61, and enters the compression chamber of the upper cylinder 2 from the port 62.

[0057] Figure 8 is a partial sectional view of a third kind of rotor compressor of the present application. Figure 9 is an enlarged view of a part of Figure 8. As shown in Figures 8 and 9, the third kind of rotor compressor of the present application differs from the first kind of rotor compressor in the position and structure of the charge air pipe 6. In the third kind of rotor compressor, the charge air pipe 6 is arranged on the intermediate plate 3. The charge air pipe 6 further comprises a radial pipe 61 arranged on the intermediate plate 3. The first end of the radial pipe 61 penetrates through the outer wall surface of the intermediate plate 3 and is exposed. The second end of the radial pipe 61 communicates with the middle part of a charge air port 62. The upper end and the lower end of the charge air port 62 respectively communicate with the bottom surface of the upper compression chamber and the top surface of the lower compression chamber. The upper end and the lower end of the charge air port 62 are respectively provided with a charge air cavity 64. Each charge air cavity 64 is respectively provided with a charge air valve 65. When the refrigerant flows from the intermediate plate 3 to the two end charge air valves 65, the air flow is discharged from the charge air valves 65 and then enters the compression chambers of the upper cylinder 2 and the lower cylinder 4 respectively through the charge air port 62.

[0058] In summary, the rotor compressor of the present application can maintain the charge air amount basically unchanged under different working conditions, improve the operating capacity of the compressor, and balance the energy efficiency of the compressor and the adaptability to different working conditions.

[0059] The above is a further detailed description of the present application in combination with specific optional embodiments. The specific implementation of the present application should not be limited to these descriptions. For ordinary skilled persons in the technical field of the present application, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be considered as falling within the protection scope of the present application.

Claims

1. A rotary compressor characterized by comprising: The application relates to a refrigeration compressor, which comprises the following parts: a shell; a motor, a cylinder and a crankshaft, which are arranged in the shell, the cylinder has an exhaust port (7), a sliding vane groove and a sliding vane, the crankshaft transmits the rotating force of the motor to a piston to make the piston rotate in the cylinder to compress refrigerant; a gas supplement pipeline (6) connected to a compression chamber, in a cross section perpendicular to the rotating shaft of the motor, the center point of the exhaust port (7) is based on a first projection point of the cross section and the rotating shaft of the motor is based on a second projection point of the cross section to form a first connecting line, the center point of a gas supplement port (62) of the gas supplement pipeline (6) is based on a third projection point of the cross section and the second projection point to form a second connecting line, an included angle theta is formed between the first connecting line and the second connecting line, and the value range of the theta is 11 DEG <= theta <= 100 DEG.

2. The rotary compressor of claim 1, wherein The cylinder comprises an upper cylinder (2) and a lower cylinder (4), and the upper cylinder (2) and the lower cylinder (4) each have an exhaust port (7), a sliding vane groove and a sliding vane; two pistons are rotatably arranged in the upper cylinder (2) and the lower cylinder (4) respectively; the crankshaft has two eccentric parts, and the crankshaft transmits the rotating force of the motor to the two pistons, and the two eccentric parts drive the two pistons to rotate in the respective cylinders.

3. The rotary compressor of claim 2, wherein The application further comprises: an upper bearing assembly (1) arranged above the upper cylinder (2) and connected to the inner wall of the shell; an intermediate plate (3) arranged between the upper cylinder (2) and the lower cylinder (4), the upper bearing assembly (1) and the intermediate plate (3) clamp the upper cylinder (2) to form an upper compression chamber together; a lower bearing assembly (5) arranged below the lower cylinder (4), the lower bearing assembly (5) and the intermediate plate (3) clamp the lower cylinder (4) to form a lower compression chamber together.

4. The rotary compressor of claim 2, wherein: The gas supplement port (62) is a pipeline, the extension direction of the pipeline is parallel to the rotating shaft direction of the motor, and the value range of the theta is 11 DEG <= theta <= 40 DEG.

5. The rotary compressor of claim 1, wherein: The value range of the theta is 20 DEG <= theta <= 30 DEG.

6. The rotary compressor of claim 2, wherein: The gas supplement pipeline (6) is arranged in the upper cylinder (2), and the gas supplement pipeline (6) further comprises: a radial pipe (61) arranged in the side wall of the upper cylinder (2), a first end of the radial pipe (61) is exposed on the outer surface of the side wall of the upper cylinder (2), and a second end of the radial pipe (61) is communicated with the upper end of the gas supplement port (62); an inlet (63) arranged at the bottom of the inner side of the side wall of the upper cylinder (2) and communicated with the lower end of the gas supplement port (62).

7. The rotary compressor of claim 3, wherein: The gas supplement pipeline (6) is arranged in the upper bearing assembly (1), and the gas supplement pipeline (6) further comprises: a radial pipe (61) arranged in the upper bearing assembly (1), a first end of the radial pipe (61) is exposed on the outer wall surface of the upper bearing assembly (1), and a second end of the radial pipe (61) is communicated with the upper end of the gas supplement port (62).

8. The rotary compressor of claim 7, wherein: The lower end of the gas supplement port (62) is communicated with the top surface of the upper compression chamber.

9. The rotary compressor of claim 2, wherein: The gas supplement pipeline (6) is arranged in the intermediate plate (3), and the gas supplement pipeline (6) further comprises: A radial pipe (61) is arranged in the intermediate plate (3), a first end of the radial pipe (61) is exposed on the outer wall surface of the intermediate plate (3), and a second end of the radial pipe (61) is communicated with the middle part of the air supplementing port (62), the upper end and the lower end of the air supplementing port (62) are respectively communicated with the bottom surface of the upper compression cavity and the top surface of the lower compression cavity.

10. The rotary compressor of claim 2, wherein: The upper end and the lower end of the air supplementing port (62) are respectively provided with an air supplementing cavity (64), and each air supplementing cavity (64) is respectively provided with an air supplementing valve (65).

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