Rotary compressor and oil supply structure thereof

Abstract

The invention discloses a rotary compressor and an oil supply structure thereof, and relates to the technical field of compressors, the oil supply structure of the rotary compressor comprises a pressure guide channel and an oil supply channel, and the pressure guide channel communicates with an air suction port, an auxiliary bearing, a crankshaft and a main bearing; the internal pressure of the air suction port is introduced into the auxiliary bearing, the crankshaft and the main bearing; the oil supply channel is communicated with the oil pool, the auxiliary bearing, the crankshaft and the main bearing, and the external pressure of the oil pool is larger than the internal pressure of the air suction port, so that a lubricating medium in the oil pool is pressed into the auxiliary bearing, the crankshaft and the main bearing under the action of pressure difference. According to the oil supply structure of the rotary compressor, the problem of overload jump stop or abrasion caused by insufficient lubrication of an existing rotary compressor at a high rotating speed is effectively solved, and the reliability and the performance of the compressor are improved.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a rotary compressor and an oil supply structure thereof. Background Art

[0002] Rotary compressors are widely used in air conditioning, refrigeration and other fields due to their efficient refrigeration capabilities. Their miniaturization and high-speed operation place higher demands on the lubrication and oil supply system.

[0003] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the oil supply system of the existing rotary compressor mostly relies on mechanical centrifugal force, which can easily lead to insufficient lubrication at high speeds, causing overload tripping or wear, and limiting the further improvement of the compressor performance. Summary of the invention

[0004] The purpose of the present application is to provide an oil supply structure for a rotary compressor, which effectively solves the problem of overload tripping or wear caused by insufficient lubrication at high speeds in existing rotary compressors, thereby improving the reliability and performance of the compressor. Another purpose of the present application is to provide a rotary compressor.

[0005] To achieve the above object, the present application provides an oil supply structure for a rotary compressor, comprising:

[0006] a pressure-introducing passage, communicating with the air intake port, the auxiliary bearing, the crankshaft and the main bearing, so as to introduce the internal pressure of the air intake port into the auxiliary bearing, the crankshaft and the main bearing;

[0007] The oil supply passage connects the oil pool, the auxiliary bearing, the crankshaft and the main bearing. The external pressure of the oil pool is greater than the internal pressure of the air intake port, so that the lubricating medium in the oil pool is pressed into the auxiliary bearing, the crankshaft and the main bearing under the action of the pressure difference.

[0008] In some embodiments, the pressure induction channel includes:

[0009] a first air passage, communicating the air intake port and the auxiliary bearing;

[0010] The second air passage is connected with the auxiliary bearing, the crankshaft and the main bearing.

[0011] In some embodiments, the first air duct includes a first air duct segment opened at the air intake port, a second air duct segment opened at the pump body, and a third air duct segment opened at the auxiliary bearing, and the first air duct segment, the second air duct segment, and the third air duct segment are connected in sequence.

[0012] In some embodiments, the second air duct includes a fourth air duct section opened at the secondary bearing, a fifth air duct section opened at the crankshaft, and a sixth air duct section opened at the main bearing, and the fourth air duct section, the fifth air duct section, and the sixth air duct section are connected in sequence.

[0013] In some embodiments, the fourth airway segment includes a first airway structure and a second airway structure that are connected, wherein the first airway structure is arranged along the radial direction of the secondary bearing, and the first airway structure is connected to the first airway; the second airway structure is arranged along the axial direction of the secondary bearing, and the second airway structure is connected to the fifth airway segment; and / or,

[0014] The fifth air passage section comprises a central hole located inside the crankshaft, wherein the central hole is arranged along the axial direction of the crankshaft; and / or,

[0015] The sixth air passage segment includes an annular groove located inside the main bearing, and the annular groove is arranged along the circumference of the main bearing.

[0016] In some embodiments, the oil supply passage includes a first oil passage section opened at the secondary bearing, a second oil passage section opened at the crankshaft, and a third oil passage section opened at the main bearing. The first oil passage section, the second oil passage section and the third oil passage section are connected in sequence, and the oil inlet of the first oil passage section is immersed in the oil pool.

[0017] In some embodiments, the first oil passage section includes a first spiral oil groove located on the inner periphery of the auxiliary bearing, the second oil passage section includes a second spiral oil groove located on the outer periphery of the crankshaft, and the third oil passage section includes a third spiral oil groove located on the inner periphery of the main bearing;

[0018] The first spiral oil groove and the third spiral oil groove are staggered in distribution in a spiral form so as to stagger the oil supply timing of the auxiliary bearing and the main bearing.

[0019] In some embodiments, the secondary bearing is provided with a return oil passage, which leads to the outside of the secondary bearing and communicates with the air inlet of the pump body, so that the lubricating medium can return to the oil pool under the drive of the pump body.

[0020] The present application also provides a rotary compressor, comprising the oil supply structure of the rotary compressor.

[0021] In some embodiments, the rotary compressor includes a housing, a motor and a pump body, the interior of the housing has a motor cavity and a pump body cavity that are connected, the motor is located in the motor cavity, and the pump body is located in the pump body cavity;

[0022] The pump body cavity is provided with an air intake port and an air exhaust port, wherein the air intake port leads to the interior of the pump body, and the air exhaust port leads to the exterior of the pump body.

[0023] Compared with the prior art, the technical solution provided by this application has at least the following beneficial effects:

[0024] The oil supply structure of the rotary compressor provided in the present application mainly includes a pressure-introducing channel and an oil supply channel. The pressure-introducing channel connects the air intake port, the auxiliary bearing, the crankshaft and the main bearing to introduce the internal pressure of the air intake port into the auxiliary bearing, the crankshaft and the main bearing; the oil supply channel connects the oil pool, the auxiliary bearing, the crankshaft and the main bearing. The external pressure of the oil pool is greater than the internal pressure of the air intake port, so that the lubricating medium in the oil pool is pressed into the auxiliary bearing, the crankshaft and the main bearing under the action of the pressure difference.

[0025] The core of the oil supply structure of the rotary compressor provided by the present application is to utilize the synergistic effect of the pressure-introducing channel and the oil supply channel to achieve stable and effective lubrication oil supply at high speed. The main function of the pressure-introducing channel is to introduce the low pressure of the air intake port into the key bearing parts of the compressor, namely the auxiliary bearing, crankshaft and main bearing. Since the pressure at the air intake port is lower than the pressure in the oil pool, this pressure difference provides power for the oil supply.

[0026] The oil supply channel uses this pressure difference to press the lubricating medium in the oil pool into the auxiliary bearing, crankshaft and main bearing. Specifically, the external pressure of the oil pool is greater than the internal pressure of the air intake port. Therefore, under the action of the pressure difference, the lubricating medium will naturally flow from the high-pressure area (oil pool) to the low-pressure area (auxiliary bearing, crankshaft and main bearing), realizing automatic oil supply.

[0027] This design directly addresses the problem of insufficient lubrication of existing rotary compressors at high speeds mentioned in the background technology. The low pressure at the suction port is introduced through the pressure inlet channel to form a pressure difference with the high pressure in the oil pool, and the oil supply channel uses this pressure difference to achieve stable oil supply. In this way, even at high speeds, the key components of the compressor can be continuously and adequately lubricated, effectively avoiding overload tripping or wear problems caused by insufficient lubrication.

[0028] Combined with the above structure and process description, it can be seen that the oil supply structure of the rotary compressor effectively solves the problem of overload tripping or wear caused by insufficient lubrication at high speed in the existing rotary compressor through the design of the pressure-inducing channel and the oil supply channel, thereby improving the reliability and performance of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0030] FIG1 is a schematic diagram of a rotary compressor provided in an embodiment of the present application;

[0031] FIG2 is a schematic diagram of an oil supply structure of a rotary compressor provided in an embodiment of the present application;

[0032] FIG3 is a schematic diagram of a pressure induction channel and an oil supply channel provided in an embodiment of the present application;

[0033] FIG4 is a schematic diagram of a fourth air passage section and a first oil passage section provided in an embodiment of the present application;

[0034] FIG5 is a schematic diagram of a first spiral oil groove provided in an embodiment of the present application;

[0035] FIG6 is a schematic diagram of a third spiral oil groove provided in an embodiment of the present application;

[0036] FIG. 7 is a schematic diagram of an end cover plate provided in an embodiment of the present application.

[0037] in:

[0038] Inlet 1, auxiliary bearing 2, crankshaft 3, main bearing 4, oil pool 5, pump body 6, upper cylinder 61, lower cylinder 62, motor 7, stator 71, rotor 72, partition 8, shell 9, main shell 91, upper shell 92, lower shell 93, motor cavity 94, pump body cavity 95, exhaust port 10, end cover plate 11,

[0039] The pressure channel 100, the first airway 110, the first airway segment 111, the second airway segment 112, the third airway segment 113, the second airway 120, the fourth airway segment 121, the first airway structure 1211, the second airway structure 1212, the fifth airway segment 122, the middle hole 1221, the sixth airway segment 123, the annular groove 1231,

[0040] The oil supply passage 200 , the first oil passage section 210 , the first spiral oil groove 211 , the second oil passage section 220 , the second spiral oil groove 221 , the third oil passage section 230 , and the third spiral oil groove 231 . DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Please refer to Figures 1 and 2, wherein Figure 1 is a schematic diagram of a rotary compressor provided in an embodiment of the present application, and Figure 2 is a schematic diagram of an oil supply structure of a rotary compressor provided in an embodiment of the present application. In Figure 2, a line segment composed of a solid line and a line arrow represents a pressure-inducing channel 100, and a line segment composed of a hollow line and a triangular arrow represents an oil supply channel 200.

[0044] In a first specific implementation, the oil supply structure of the rotary compressor provided in the implementation scheme of the present application mainly includes a pressure inlet channel 100 and an oil supply channel 200 .

[0045] As shown in Figures 1 and 2, the pressure-inducing channel 100 connects the air intake port 1, the auxiliary bearing 2, the crankshaft 3 and the main bearing 4, so as to introduce the internal pressure of the air intake port 1 into the auxiliary bearing 2, the crankshaft 3 and the main bearing 4; the oil supply channel 200 connects the oil pool 5, the auxiliary bearing 2, the crankshaft 3 and the main bearing 4, and the external pressure of the oil pool 5 is greater than the internal pressure of the air intake port 1, so that the lubricating medium in the oil pool 5 is pressed into the auxiliary bearing 2, the crankshaft 3 and the main bearing 4 under the action of the pressure difference.

[0046] The core of the oil supply structure of the rotary compressor provided in the present application is to utilize the synergistic effect of the pressure-introducing channel 100 and the oil supply channel 200 to achieve stable and effective lubrication oil supply at high speed. The main function of the pressure-introducing channel 100 is to introduce the low pressure of the air intake port 1 into the key bearing parts of the compressor, namely the auxiliary bearing 2, the crankshaft 3 and the main bearing 4. Since the pressure at the air intake port 1 is lower than the pressure of the oil pool 5, this pressure difference provides power for the oil supply.

[0047] The oil supply passage 200 uses this pressure difference to press the lubricating medium in the oil pool 5 into the auxiliary bearing 2, the crankshaft 3 and the main bearing 4. Specifically, the external pressure of the oil pool 5 is greater than the internal pressure of the air intake port 1. Therefore, under the action of the pressure difference, the lubricating medium will naturally flow from the high-pressure area (oil pool 5) to the low-pressure area (auxiliary bearing 2, crankshaft 3 and main bearing 4), realizing automatic oil supply.

[0048] This design directly addresses the problem of insufficient lubrication of existing rotary compressors at high speeds mentioned in the background art. The low pressure of the air inlet 1 is introduced through the pressure-introducing channel 100 to form a pressure difference with the high pressure of the oil pool 5, and the oil supply channel 200 uses this pressure difference to achieve stable oil supply. In this way, even at high speeds, the key components of the compressor can be continuously and adequately lubricated, effectively avoiding overload tripping or wear problems caused by insufficient lubrication.

[0049] Combined with the above structure and process description, it can be seen that the oil supply structure of the rotary compressor has at least the following beneficial effects: the oil supply structure of the rotary compressor effectively solves the overload tripping or wear problem caused by insufficient lubrication at high speed of the existing rotary compressor through the design of the pressure inlet channel 100 and the oil supply channel 200, thereby improving the reliability and performance of the compressor.

[0050] As shown in FIG1 , the rotary compressor includes a housing 9, in which are arranged a secondary bearing 2, a crankshaft 3, a main bearing 4, an oil pool 5, a pump body 6, and a motor 7. The crankshaft 3 is supported by the secondary bearing 2 and the main bearing 4, and is driven to rotate by the motor 7. The crankshaft 3 is connected to the pump body 6. Driven by the crankshaft 3, the pump body 6 inhales a low-temperature and low-pressure medium, such as refrigerant vapor, through the suction port 1 on the housing 9; after the refrigerant vapor enters the pump body 6, it is compressed and becomes a high-temperature and high-pressure superheated refrigerant vapor, and is finally discharged to the space inside the housing 9 outside the pump body 6. Here, the pump body 6 and the motor 7 are located in a connected space, and the superheated refrigerant vapor is finally discharged from the rotary compressor through the exhaust port 10 on the housing 9. Therefore, when the rotary compressor is operating normally, the suction port 1 is at a normal low pressure, while the space inside the housing 9 is at a normal high pressure. The oil pool 5 is located in this space, so the liquid level of the oil pool 5 is also at a normal high pressure.

[0051] The air inlet 1 may be an air inlet pipe separately provided on the housing 9, and the air inlet pipe needs to be directly connected to the air inlet of the pump body 6, so as to realize the air intake of the pump body 6; in addition, the air inlet 1 may also be an air inlet structure directly provided on the pump body 6, because the air inlet structure and the air inlet of the pump body 6 belong to the pump body 6, which is equivalent to the pump body 6 being directly connected to the outside of the housing 9 to realize the air intake. This embodiment does not exclude that the air inlet 1 is a structure independent of the pump body 6 or belongs to the structure of the pump body 6, and both should fall within the scope of the description of this embodiment.

[0052] It should be noted that the pressure-inducing channel 100 is a channel structure that directly leads from the air inlet 1 to the auxiliary bearing 2 and the main bearing 4, and the oil supply channel 200 is also a channel structure that directly leads from the oil pool 5 to the auxiliary bearing 2, the crankshaft 3 and the main bearing 4. This straight-through structure has a direct path, which makes the pressure-inducing and oil supply efficiency direct and efficient, and there is no pressure loss. This design is exclusive to the auxiliary bearing 2 and the main bearing 4, ensuring that the lubricating oil can be quickly and accurately delivered to these key parts, improving the lubrication effect of the bearing, reducing wear, and extending the service life of the bearing, thereby improving the reliability and performance of the entire compressor.

[0053] Please continue to refer to FIG. 1 and FIG. 2 . In some embodiments, the pressure-inducing channel 100 includes:

[0054] The first air passage 110 is connected with the air inlet 1 and the auxiliary bearing 2;

[0055] The second air passage 120 is connected with the auxiliary bearing 2 , the crankshaft 3 and the main bearing 4 .

[0056] In this embodiment, the design of the pressure-introducing channel 100 is divided into two main parts to effectively introduce the low pressure of the air intake port 1 into the key bearing parts of the compressor. First, the first air channel 110 is responsible for directly introducing the low pressure of the air intake port 1 into the secondary bearing 2. This step is the starting link of the pressure-introducing process, which effectively ensures that the low pressure can be smoothly transmitted from the air intake part of the compressor to the bearing part. Then, the second air channel 120 takes over the function of the first air channel 110, and continues to introduce the low pressure from the secondary bearing 2 inward until the crankshaft 3 and the main bearing 4, completing the entire pressure-introducing process of the pressure-introducing channel 100.

[0057] This design enables the pressure-inducing channel 100 to efficiently transmit the low-pressure environment of the air inlet 1 directly to the core bearing area of ​​the compressor, creating the necessary pressure conditions for subsequent lubrication and oil supply. Through this direct and continuous pressure-inducing method, it can be ensured that during the operation of the compressor, especially under high speed conditions, the auxiliary bearing 2 and the main bearing 4 can obtain a continuous and stable low-pressure supply, thereby providing an effective pressure difference for the transmission of the lubricating medium in the oil supply channel 200. This structure not only improves the pressure-inducing efficiency, but also enhances the stability and reliability of the compressor under high load.

[0058] It should be noted that the implementation of the first air channel 110 and the second air channel 120 can be in the form of building a channel on the corresponding structure, or in the form of constructing a channel between the corresponding structures through orderly gaps and appropriate sealing. This embodiment does not exclude either building a channel or constructing a channel, which should fall within the scope of the description of this embodiment.

[0059] Please refer to FIG. 3 , which is a schematic diagram of a pressure-inducing channel and an oil supply channel provided in an embodiment of the present application.

[0060] As shown in Figure 3, in some embodiments, the first air duct 110 includes a first air duct section 111 opened at the air intake port 1, a second air duct section 112 opened at the pump body 6, and a third air duct section 113 opened at the auxiliary bearing 2, and the first air duct section 111, the second air duct section 112, and the third air duct section 113 are connected in sequence.

[0061] In this embodiment, the first air passage 110 is composed of three continuously connected air passage sections, namely the first air passage section 111, the second air passage section 112 and the third air passage section 113. This continuous air passage structure effectively ensures that the low pressure in the air intake port 1 can be smoothly introduced into the auxiliary bearing 2.

[0062] Specifically, the first airway section 111 is the part opened in the air intake port 1. It serves as the first station for the introduction of low pressure and is directly connected to the internal space of the air intake port 1. Subsequently, the second airway section 112 is the part opened in the pump body 6. It takes over the first airway section 111, so that the low pressure can be smoothly transferred from the air intake port 1 to the inside of the pump body 6. Finally, the third airway section 113 is the part opened in the auxiliary bearing 2. It introduces the low pressure from the pump body 6 to the auxiliary bearing 2, completing the low pressure introduction process from the air intake port 1 to the auxiliary bearing 2.

[0063] This design not only ensures the continuity and effectiveness of the pressure-inducing channel 100, but also realizes the purpose of directly acting the low pressure of the air inlet 1 on the auxiliary bearing 2 by connecting the three airway sections in sequence, providing structural guarantee for the stable operation and efficient oil supply of the compressor. Such a structural design helps to improve the lubrication efficiency of the compressor under high speed conditions and reduce the risk of failure caused by insufficient lubrication.

[0064] In some cases, the introduction of low pressure can be achieved by introducing low pressure gas; gases of different components should all fall within the scope of the description of this embodiment.

[0065] Please continue to refer to FIG. 3 and FIG. 4 . FIG. 4 is a schematic diagram of the fourth air passage section and the first oil passage section provided in an embodiment of the present application.

[0066] In some embodiments, the second air duct 120 includes a fourth air duct section 121 opened in the auxiliary bearing 2, a fifth air duct section 122 opened in the crankshaft 3, and a sixth air duct section 123 opened in the main bearing 4, and the fourth air duct section 121, the fifth air duct section 122 and the sixth air duct section 123 are connected in sequence.

[0067] In this embodiment, the second air passage 120 is composed of the fourth air passage section 121, the fifth air passage section 122 and the sixth air passage section 123 connected in sequence, which are respectively opened in the auxiliary bearing 2, the crankshaft 3 and the main bearing 4. This structural design enables the low pressure to be smoothly transmitted from the auxiliary bearing 2 to the crankshaft 3 and finally reach the main bearing 4.

[0068] Specifically, the fourth air passage section 121 is located in the auxiliary bearing 2, which receives the low pressure of the first air passage 110 and is the starting part of the second air passage 120. Subsequently, the fifth air passage section 122 is located in the crankshaft 3, which guides the low pressure from the auxiliary bearing 2 to the inside of the crankshaft 3. Finally, the sixth air passage section 123 is located in the main bearing 4, which completes the process of introducing the low pressure from the crankshaft 3 to the main bearing 4.

[0069] Through such a design, the second air passage 120 realizes the continuous transmission of the low pressure of the air inlet 1 to the key bearing components inside the compressor, ensuring that the auxiliary bearing 2, the crankshaft 3 and the main bearing 4 can obtain effective low-pressure supply during the operation of the compressor. This continuous low-pressure transmission is essential for maintaining the pressure balance inside the compressor, improving the lubrication efficiency and ensuring the stable operation of the mechanical parts. Such a structure not only improves the pressure-drawing efficiency, but also helps to reduce mechanical failures caused by insufficient lubrication or pressure imbalance, thereby enhancing the overall performance and reliability of the compressor.

[0070] In some embodiments, the fourth air duct segment 121 includes a first air duct structure 1211 and a second air duct structure 1212 that are connected. The first air duct structure 1211 is arranged along the radial direction of the secondary bearing 2, and the first air duct structure 1211 is connected to the first air duct 110; the second air duct structure 1212 is arranged along the axial direction of the secondary bearing 2, and the second air duct structure 1212 is connected to the fifth air duct segment 122.

[0071] In this embodiment, the design of the fourth airway section 121 includes two key parts: the first airway structure 1211 and the second airway structure 1212. The first airway structure 1211 is arranged along the radial direction of the auxiliary bearing 2, which means that it is perpendicular to the central axis of the auxiliary bearing 2, communicates with the third airway section 113, and is responsible for introducing the low pressure into the fourth airway section 121. The first airway structure 1211 is communicated with the first airway 110, ensuring that the low pressure can smoothly enter the auxiliary bearing 2. The second airway structure 1212 is arranged along the axial direction of the auxiliary bearing 2, perpendicular to the first airway structure 1211, and is responsible for further guiding the low pressure from the fourth airway section 121 to the fifth airway section 122, and is communicated along the axial direction of the auxiliary bearing 2, providing a channel for the continuous transmission of the low pressure.

[0072] In some embodiments, the fifth air passage segment 122 includes a center hole 1221 located inside the crankshaft 3 , and the center hole 1221 is arranged along the axial direction of the crankshaft 3 .

[0073] In this embodiment, the fifth air passage section 122 is realized by a center hole 1221 located inside the crankshaft 3, and the center hole 1221 is arranged along the axial direction of the crankshaft 3, allowing the low pressure to be smoothly transmitted from the auxiliary bearing 2 to the crankshaft 3. The design of the center hole 1221 enables the low pressure to flow along the axial direction of the crankshaft 3, providing a direct low pressure passage for the crankshaft 3.

[0074] In some embodiments, the sixth air passage segment 123 includes an annular groove 1231 located inside the main bearing 4 , and the annular groove 1231 is arranged along the circumference of the main bearing 4 .

[0075] In this embodiment, the sixth air passage section is realized by an annular groove 1231 located inside the main bearing 4. The annular groove 1231 is arranged along the circumference of the main bearing 4 and can be regarded as an inner diameter notch, so that the middle hole 1221 can be connected with the inner diameter of the main bearing 4, allowing the low pressure to be smoothly transmitted from the crankshaft 3 to the main bearing 4. The design of the annular groove 1231 enables the low pressure to flow along the circumference of the main bearing 4, providing a direct low pressure passage for the main bearing 4.

[0076] The design of these airway sections and structures together constitute an efficient pressure-inducing channel 100, ensuring that the low-pressure pressure transmission path from the intake port 1 to the auxiliary bearing 2, crankshaft 3 and main bearing 4 is direct and continuous, improving the pressure-inducing efficiency and enhancing the lubrication effect of the bearing components, thereby improving the performance and reliability of the entire rotary compressor.

[0077] In some cases, the low pressure is introduced to the auxiliary bearing 2 and the main bearing 4 , forming a pressure difference gradient among the oil pool 5 , the oil supply passage 200 , the main bearing 4 , the auxiliary bearing 2 , and the air intake port 1 .

[0078] In some embodiments, the oil supply channel 200 includes a first oil channel section 210 opened in the auxiliary bearing 2, a second oil channel section 220 opened in the crankshaft 3, and a third oil channel section 230 opened in the main bearing 4. The first oil channel section 210, the second oil channel section 220 and the third oil channel section 230 are connected in sequence, and the oil inlet of the first oil channel section 210 is immersed in the oil pool 5.

[0079] In this embodiment, the design of the oil supply passage 200 includes three main parts: a first oil passage section 210, a second oil passage section 220 and a third oil passage section 230. These oil passage sections are respectively opened in the auxiliary bearing 2, the crankshaft 3 and the main bearing 4, forming a continuous oil supply path to ensure that the lubricating medium can flow smoothly from the oil pool 5 to various key bearing components.

[0080] The first oil passage section 210 is located in the auxiliary bearing 2, and its oil inlet is designed to be immersed in the oil pool 5. This design enables the first oil passage section 210 to directly absorb lubricating medium from the oil pool 5. Since the external pressure of the oil pool 5 is greater than the internal pressure of the air intake port 1, the lubricating medium is introduced into the oil supply channel 200 under the action of the pressure difference.

[0081] The second oil passage section 220 is located in the crankshaft 3 and is connected to the first oil passage section 210 to ensure that the lubricating medium can flow smoothly from the auxiliary bearing 2 to the crankshaft 3. This connectivity ensures the continuous supply of the lubricating medium and reduces the pressure loss during the oil supply process.

[0082] The third oil passage section 230 is located in the main bearing 4 and communicates with the second oil passage section 220, so that the lubricating medium can finally reach the main bearing 4. Such a design not only ensures that the lubricating medium can cover all key bearing components, but also improves the efficiency of the entire oil supply system.

[0083] Through this design, the oil supply channel 200 realizes direct oil supply from the oil pool 5 to the auxiliary bearing 2, crankshaft 3 and main bearing 4, improves the transmission efficiency of the lubricating medium, ensures that the bearing components are continuously and adequately lubricated during the operation of the compressor, thereby improving the reliability and performance of the compressor.

[0084] Please refer to Figures 5 to 7, wherein Figure 5 is a schematic diagram of the first spiral oil groove provided in an embodiment of the present application, Figure 6 is a schematic diagram of the third spiral oil groove provided in an embodiment of the present application, and Figure 7 is a schematic diagram of the end cover plate provided in an embodiment of the present application.

[0085] In some embodiments, the first oil passage section 210 includes a first spiral oil groove 211 located on the inner periphery of the auxiliary bearing 2, the second oil passage section 220 includes a second spiral oil groove 221 located on the outer periphery of the crankshaft 3, and the third oil passage section 230 includes a third spiral oil groove 231 located on the inner periphery of the main bearing 4;

[0086] The first spiral oil groove 211 and the third spiral oil groove 231 are staggered in distribution in a spiral form, so as to stagger the oil supply sequence of the auxiliary bearing 2 and the main bearing 4 .

[0087] In this embodiment, the design of these spiral oil grooves not only promotes the flow of lubricating medium in the oil channel, but also increases the fluidity and oil supply efficiency of the oil channel through its spiral shape. In particular, the oil channel section design of the oil supply channel 200 has specific structural characteristics to achieve efficient oil supply distribution and timing control.

[0088] The design of the oil supply channel 200 can distribute the lubricating medium to the crankshaft 3 and the main bearing 4 in one way and to the auxiliary bearing 2 in the other way. This distribution method ensures that the key components of the compressor can be fully lubricated. At the same time, due to the design of the spiral oil groove, the lubricating medium can form an effective flow in the oil channel, thereby improving the uniformity and efficiency of the oil supply.

[0089] The first spiral oil groove 211 and the third spiral oil groove 231 are staggered in the spiral form, realizing the disconnection and connection of the pressure difference oil supply mode. The auxiliary bearing 2 and the main bearing 4 will not receive the lubricating medium at the same time. This design allows the oil supply system to supply oil to different bearing components at different times, thereby avoiding the problem of insufficient pressure or excess oil that may be caused by simultaneous oil supply. In this way, the oil supply power is more sufficient and the oil volume is more sufficient, which helps to form a reasonable oil circulation inside the compressor and ensures the reliable operation of the compressor.

[0090] In summary, the design of this oil supply channel effectively realizes the precise control of the oil supply timing through the staggered distribution of the spiral oil grooves, while effectively ensuring the sufficiency and power of the oil supply, providing a strong guarantee for the stable operation and long-term reliability of the compressor.

[0091] In some embodiments, the auxiliary bearing 2 is provided with a return oil passage, which leads to the outside of the auxiliary bearing 2 and communicates with the air inlet of the pump body 6 to enable the lubricating medium to return to the oil pool 5 under the drive of the pump body 6 .

[0092] In this embodiment, the auxiliary bearing 2 is specially designed with a return oil passage. Such a design allows the lubricating medium to be guided back to the oil pool 5 by the driving force of the pump body 6 after lubricating the key components of the compressor.

[0093] The setting of the return oil channel optimizes the recycling of the lubricating medium, reduces the waste of lubricating oil, and ensures that the lubricating medium can continue to circulate effectively inside the compressor. Driven by the pump body 6, the return oil channel not only promotes the recycling of the lubricating medium, but also helps to maintain the stability of the oil amount in the oil pool 5, thereby effectively ensuring the reliability and efficiency of the compressor during long-term operation.

[0094] In some cases, a pressure-inducing channel 100 is constructed to connect to the air inlet of the pump body 6, and is communicated with the air inlet of the pump body 6 through the third air duct section 113 on the secondary bearing 2, and the third air duct section 113 is located at the upper end of the secondary bearing 2; the low pressure can be led to the main bearing 4 and the secondary bearing 2, and the lubricating oil in the oil pool 5 flows into the secondary bearing 2 under the action of the pressure difference, and supplies oil to the main bearing 4 and the secondary bearing 2 in two directions along the outer surface of the crankshaft 3. The return oil channel is located at the lower end of the secondary bearing 2. After lubrication, the lubricating oil is collected at the neck end of the secondary bearing 2, and returns to the air inlet of the pump body 6 through the return oil channel, and returns to the oil pool 5 again following the circulation of the refrigerant. The refrigerant leaves upward from the exhaust port 10, and the lubricating oil flows downward back to the oil pool 5.

[0095] The present application also provides a rotary compressor, comprising the oil supply structure of the rotary compressor.

[0096] The rotary compressor includes the oil supply structure of the rotary compressor, and should have all the beneficial technical effects of the oil supply structure of the rotary compressor, so that the lubricating oil forms an oil circuit circulation with the pressure difference as the power.

[0097] Compared with the oiling method of oiling blades, the differential pressure oil supply of this rotary compressor is more stable. As long as the compression is running, the oil circuit pressure difference can be established, and the oil circuit circulation can be carried out. The power of the differential pressure oil supply is more sufficient than that provided by the oiling blades. Therefore, whether at extremely low or extremely high speeds, this oil supply method can provide sufficient lubricating oil for the compressor, so this oil supply method can widen the operating range of the compressor speed. Secondly, the entire assembly process of this compressor is only slightly different from the original compressor, and the adaptation cost of the entire production line is extremely low.

[0098] In some cases, the rotary compressor is an aluminum shell horizontal compressor suitable for high back pressure structural design.

[0099] In some embodiments, the rotary compressor includes a housing 9, a motor 7 and a pump body 6, wherein the interior of the housing 9 has a motor cavity 94 and a pump body cavity 95 connected to each other, the motor 7 is located in the motor cavity 94, and the pump body 6 is located in the pump body cavity 95;

[0100] The pump body cavity 95 is provided with an air intake port 1 and an air exhaust port 10 . The air intake port 1 leads to the interior of the pump body 6 , and the air exhaust port 10 leads to the exterior of the pump body 6 .

[0101] It should be noted that although the motor 7 is installed in the motor cavity 94 and the pump body 6 is located in the pump body cavity 95, this layout enables the motor 7 and the pump body 6 to work together, but the motor cavity 94 and the pump body cavity 95 are both designed as high-pressure chambers. This design helps to maintain the pressure balance inside the compressor and ensure the efficient operation of the compressor.

[0102] The pump body cavity 95 is specially designed with an air intake port 1 and an air exhaust port 10. The air intake port 1 leads directly to the interior of the pump body 6. This design enables the pump body 6 to efficiently inhale gas from the air intake port 1 and discharge it through the air exhaust port 10 after compression. This path directly leading to the pump body 6 is short and efficient, reducing energy loss.

[0103] In some cases, in order to more conveniently realize the function of the auxiliary bearing 2 and reduce the difficulty of the structural design of the auxiliary bearing 2, an end cover plate 11 is provided and connected to the auxiliary bearing 2 through fasteners. At this time, the channel structure on the auxiliary bearing 2 can be set to an open form. By combining the end cover plate 11 and the auxiliary bearing 2 and adding sealing members, the sealing of the channel structure is achieved, so that the internal low pressure of the auxiliary bearing 2 is isolated from the external high pressure.

[0104] In some cases, the pump body 6 includes an upper cylinder 61 and a lower cylinder 62. The upper cylinder 61 and the lower cylinder 62 have similar principles, and both have air inlets, which play the role of sucking gas and discharging compressed gas. Optionally, a partition 8 is provided between the upper cylinder 61 and the lower cylinder 62. In order to more conveniently connect the air inlets of the upper cylinder 61 and the lower cylinder 62, an air hole is provided on the partition 8 to connect the air inlets of the upper cylinder 61 and the lower cylinder 62.

[0105] In some cases, the motor 7 includes a stator 71 and a rotor 72 , wherein the stator 71 is fixed in the housing 9 and the rotor 72 is fixed on the crankshaft 3 , and is converted into a rotational driving force of the crankshaft 3 through the action relationship between the stator 71 and the rotor 72 .

[0106] In some cases, the shell 9 includes a main shell 91 , an upper shell 92 and a lower shell 93 . The upper shell 92 and the lower shell 93 are fixed to both ends of the main shell 91 , and the three are combined to form a complete shell 9 .

[0107] During operation, the motor 7 inputs power to the pump body 6 of the compressor through the crankshaft 3, and the pump body 6 completes the compression movement of suction and exhaust. The low-temperature and low-pressure refrigerant vapor enters the cylinder (upper cylinder 61 and / or lower cylinder 62) through the suction port 1, and after being compressed by the cylinder, the low-temperature and low-pressure refrigerant vapor becomes high-temperature and high-pressure superheated refrigerant vapor, and is discharged from the pump body 6 through the muffler of the main bearing 4, and finally discharged from the compressor through the exhaust port 10.

[0108] Specifically, the pump body 6 inhales air through the air intake port 1 and distributes it to the upper cylinder 61 and the lower cylinder 62. The compressed gas is then exhausted to the muffler of the main bearing 4 and the muffler of the auxiliary bearing 2 respectively. The exhaust gas in the muffler of the auxiliary bearing 2 is collected in the main bearing 4 and discharged to the motor cavity 94. The exhaust gas in the motor cavity 94 flows to the pump body cavity 95 through the main bearing 4 and is finally discharged from the compressor through the exhaust port 10.

[0109] It should be noted that many of the components mentioned in this application are universal standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0110] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0111] The rotary compressor and its oil supply structure provided by the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An oil supply structure for a rotary compressor, characterized in that: include: a pressure-introducing passage, communicating with the air intake port, the auxiliary bearing, the crankshaft and the main bearing, so as to introduce the internal pressure of the air intake port into the auxiliary bearing, the crankshaft and the main bearing; The oil supply passage connects the oil pool, the auxiliary bearing, the crankshaft and the main bearing. The external pressure of the oil pool is greater than the internal pressure of the air intake port, so that the lubricating medium in the oil pool is pressed into the auxiliary bearing, the crankshaft and the main bearing under the action of the pressure difference.

2. The oil supply structure according to claim 1, characterized in that: The pressure-inducing channel comprises: a first air passage, communicating the air intake port and the auxiliary bearing; The second air passage is connected with the auxiliary bearing, the crankshaft and the main bearing.

3. The oil supply structure according to claim 2, characterized in that: The first air passage includes a first air passage section opened at the air intake port, a second air passage section opened at the pump body, and a third air passage section opened at the auxiliary bearing. The first air passage section, the second air passage section, and the third air passage section are connected in sequence.

4. The oil supply structure according to claim 2, characterized in that: The second air passage includes a fourth air passage section opened at the auxiliary bearing, a fifth air passage section opened at the crankshaft, and a sixth air passage section opened at the main bearing, and the fourth air passage section, the fifth air passage section, and the sixth air passage section are connected in sequence.

5. The oil supply structure according to claim 4, characterized in that: The fourth airway segment includes a first airway structure and a second airway structure that are connected, wherein the first airway structure is arranged along the radial direction of the secondary bearing, and the first airway structure is connected to the first airway; the second airway structure is arranged along the axial direction of the secondary bearing, and the second airway structure is connected to the fifth airway segment; and / or, The fifth air passage section comprises a central hole located inside the crankshaft, wherein the central hole is arranged along the axial direction of the crankshaft; and / or, The sixth air passage segment includes an annular groove located inside the main bearing, and the annular groove is arranged along the circumference of the main bearing.

6. The oil supply structure according to claim 1, characterized in that: The oil supply passage includes a first oil passage section opened at the auxiliary bearing, a second oil passage section opened at the crankshaft, and a third oil passage section opened at the main bearing. The first oil passage section, the second oil passage section and the third oil passage section are connected in sequence, and the oil inlet of the first oil passage section is immersed in the oil pool.

7. The oil supply structure according to claim 6, characterized in that: The first oil passage section includes a first spiral oil groove located on the inner periphery of the auxiliary bearing, the second oil passage section includes a second spiral oil groove located on the outer periphery of the crankshaft, and the third oil passage section includes a third spiral oil groove located on the inner periphery of the main bearing; The first spiral oil groove and the third spiral oil groove are staggered in distribution in a spiral form so as to stagger the oil supply timing of the auxiliary bearing and the main bearing.

8. The oil supply structure according to any one of claims 1 to 7, characterized in that: The auxiliary bearing is provided with a return oil passage, which leads to the outside of the auxiliary bearing and is communicated with the air inlet of the pump body, so that the lubricating medium can return to the oil pool under the drive of the pump body.

9. A rotary compressor, characterized in that: An oil supply structure for a rotary compressor comprising the oil supply structure of any one of claims 1 to 8.

10. The rotary compressor according to claim 9, characterized in that: It comprises a housing, a motor and a pump body, wherein the interior of the housing has a motor cavity and a pump body cavity which are connected, the motor is located in the motor cavity, and the pump body is located in the pump body cavity; The pump body cavity is provided with an air intake port and an air exhaust port, wherein the air intake port leads to the interior of the pump body, and the air exhaust port leads to the exterior of the pump body.

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