Oil supply assembly, pump body assembly and scroll compressor

Abstract

The application provides an oil supply assembly, a pump body assembly and a scroll compressor. The oil supply assembly supplies lubricating oil to a crankshaft central oil hole, comprising: at least two impeller assemblies, each of which comprises a flow channel and an impeller, the impeller being arranged in the flow channel; the inlet and outlet of the flow channel being arranged at the axial ends of the impeller, the flow channel further comprising an arc segment, the lubricating oil entering the impeller along the axial direction through the inlet of the flow channel, leaving the impeller along the radial direction, and being discharged from the outlet of the flow channel through the arc segment. The application adopts the mode that multiple impellers are arranged in an overlapped manner, and the rotation of the multiple impellers is in the mode of increasing the pressure difference to supply oil, a small amount of power is consumed to increase the kinetic energy of the lubricating oil, so that the flow resistance is reduced, the power loss of the compressor is reduced, the power of the compressor is reduced, and the energy efficiency of the compressor is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of scroll compressors, and particularly relates to an oil supply assembly, a pump body assembly and a scroll compressor. BACKGROUND

[0002] At present, commercial air conditioners have been widely applied in various fields, and scroll compressors are widely applied in commercial air conditioners. According to the characteristics of scroll compressors, the high-pressure cavity is often located at the upper part of the compressor, and a special oil supply structure is required to meet the lubrication reliability requirement of the high-pressure cavity. At present, two forms of oil supply modes are adopted, namely, differential pressure oil supply and oil pump oil supply.

[0003] However, with the development of high-speed compressors, the requirement for pump body lubrication is higher and higher, and the requirement for the oil supply form at the bottom of the oil pool is also higher and higher. The ordinary oil pump oil supply mode is used to solve the problem of oil supply difficulty caused by high frequency. However, with the increase of the operating frequency of the compressor, the power of the oil pump rises rapidly, thereby affecting the energy efficiency of the scroll compressor. SUMMARY

[0004] Therefore, the application provides an oil supply assembly, a pump body assembly and a scroll compressor, which can solve the problem that, in the prior art, with the increase of the operating frequency of the compressor, the power of the oil pump rises rapidly, thereby affecting the energy efficiency of the scroll compressor.

[0005] In order to solve the above problems, the application provides an oil supply assembly for supplying lubricating oil to a crankshaft central oil hole, comprising:

[0006] At least two impeller assemblies, each of which comprises a flow channel and an impeller, the impeller being arranged in the flow channel; the inlet and outlet of the flow channel are arranged at the axial ends of the impeller, and the flow channel further comprises an arc segment; the lubricating oil enters the impeller along the axial direction through the inlet of the flow channel, leaves the impeller along the radial direction, and is discharged from the outlet of the flow channel through the arc segment;

[0007] All the impeller assemblies are arranged in axial overlap; the outlet of the upstream flow channel in the adjacent two flow channels is communicated with the inlet of the downstream flow channel; and the outlet of the most downstream impeller assembly is communicated with the crankshaft central oil hole.

[0008] Optionally, all the impellers are coaxially arranged and fixedly connected with the crankshaft.

[0009] Optionally, the oil supply assembly further comprises a sleeve, the shaft of the impeller is fixedly connected with the crankshaft through the sleeve; the sleeve is provided with a radial through hole, and the lubricating oil flows to the central hole of the sleeve and the crankshaft central oil hole in sequence through the radial through hole.

[0010] Optionally, the radial through hole is arranged along a tangential direction of the sleeve.

[0011] Optionally, the radial through hole is arranged along an axial direction and / or a circumferential direction.

[0012] Optionally, the impeller is a closed impeller, which comprises a disc, a hub, blades and a cover plate. The disc is provided with a shaft hole in the center. The hub is fixed to the disc and communicates with the shaft hole. The cover plate is annular and arranged opposite to the disc. The blades are arranged between the disc and the cover plate in a uniform distribution. The center hole of the cover plate constitutes an inlet of the impeller. Two adjacent blades, the cover plate and the disc form a fluid passage, and an outlet of the impeller is formed at the outer periphery of the disc.

[0013] Optionally, the cover plate is an arc-shaped plate concaved inward.

[0014] Optionally, when the impeller assembly comprises two impellers, the upstream impeller is larger than the downstream impeller.

[0015] According to another aspect of the present application, a pump body assembly is provided, which comprises the oil supply assembly as described above.

[0016] According to still another aspect of the present application, a scroll compressor is provided, which comprises the oil supply assembly as described above or the pump body assembly as described above.

[0017] The oil supply assembly provided by the present application supplies lubricating oil to a central oil hole of a crankshaft, which comprises at least two impeller assemblies. Each of the impeller assemblies comprises a flow channel and an impeller arranged in the flow channel. The inlet and outlet of the flow channel are arranged at the axial ends of the impeller. The flow channel further comprises an arc-shaped section. The lubricating oil enters the impeller along the axial direction through the inlet of the flow channel, leaves the impeller along the radial direction, and is discharged from the outlet of the flow channel through the arc-shaped section. All the impeller assemblies are arranged in an overlapping manner along the axial direction of the impeller. The outlet of the upstream flow channel of two adjacent flow channels communicates with the inlet of the downstream flow channel. The outlet of the most downstream impeller assembly communicates with the central oil hole of the crankshaft.

[0018] The multiple impellers are arranged in an overlapping manner. The rotation of the multiple impellers is performed in a manner of increasing the pressure difference to supply oil. A small amount of power is consumed to increase the kinetic energy of the lubricating oil, so as to reduce the flow resistance, reduce the power loss of the compressor, reduce the power of the compressor, and improve the energy efficiency of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic diagram of a scroll compressor according to an embodiment of the present application;

[0020] Figure 2 Structure diagram of the oil supply assembly of the embodiment of the present application;

[0021] Figure 3 Structure diagram of the impeller of the embodiment of the present application;

[0022] Figure 4 Fluid simulation effect diagram of the two-stage impeller of the embodiment of the present application;

[0023] Figure 5 Comparison diagram of the oil supply amount of the embodiment of the present application and the conventional structure.

[0024] The reference signs are shown as follows:

[0025] 1, crankshaft; 11, center oil hole; 2, impeller assembly; 21, impeller; 212, cover plate; 213, blade; 214, hub; 22, arc segment; 23, inlet of flow channel; 24, outlet of flow channel; 25, sleeve; 211, disc. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] Reference should be made to Figures 1 to 5 As shown, according to the embodiment of the present application, an oil supply assembly supplies lubricating oil to the center oil hole 11 of the crankshaft 1, which comprises:

[0029] At least two impeller assemblies 2, each of which comprises a flow channel and an impeller 21 arranged in the flow channel; the inlet 23 and the outlet of the flow channel are arranged at the axial ends of the impeller 21, and the flow channel further comprises an arc-shaped section 22; the lubricating oil enters the impeller 21 along the axial direction through the inlet 23 of the flow channel, exits the impeller 21 along the radial direction, and is discharged from the outlet 24 of the flow channel through the arc-shaped section 22.

[0030] All the impeller assemblies 2 are arranged in axial overlap with the impeller 21; the outlet 24 of the upstream flow channel in adjacent two flow channels is communicated with the inlet 23 of the downstream flow channel; and the outlet of the impeller assembly 2 at the most downstream is communicated with the central oil hole 11 of the crankshaft 1.

[0031] The application adopts the mode that multiple impellers 21 are arranged in overlap, and the rotation of the multiple impellers 21 is in the mode of increasing the pressure difference to supply oil, a small amount of power is consumed to increase the kinetic energy of the lubricating oil, so that the flow resistance is reduced, the power loss of the compressor is reduced, the power of the compressor is reduced, and the energy efficiency of the compressor is improved.

[0032] The application realizes increasing the potential energy of the fluid, improving the inlet oil pressure of the central oil hole 11 of the crankshaft 1, and improving the oil supply flow and lift of the compressor by arranging multiple rotating impeller assemblies 2 at the bottom end inlet of the central oil hole 11 of the crankshaft 1; due to the increase of the potential energy of the lubricating oil, the kinetic energy entering the central oil hole 11 is increased and the flow resistance is reduced, the power consumption loss of the compressor can be effectively reduced, the vibration of the compressor is reduced, the reliability of the compressor is improved, and the energy efficiency of the compressor is improved.

[0033] Wherein the upstream and downstream in the above are determined according to the flow direction of the lubricating oil in the flow channel.

[0034] In some embodiments, all the impellers 21 are coaxially arranged and fixedly connected with the crankshaft 1.

[0035] All the impellers 21 are coaxially arranged, and the shaft is fixedly connected with the crankshaft 1, so that the rotation of the crankshaft 1 directly drives the rotation of all the impellers 21; with the change of the rotating speed of the crankshaft 1, the oil supply capacity of the impeller 21 to the central oil hole 11 also changes accordingly; for example, at high speed, the pressure difference of the oil supply of the multiple impellers 21 is larger, the oil supply amount is large, the lift is high, and the work loss of the compressor is reduced.

[0036] In some embodiments, the oil supply assembly further comprises a sleeve 25, the shaft of the impeller 21 is fixedly connected with the crankshaft 1 through the sleeve 25; the sleeve 25 is provided with a radial through hole, and the lubricating oil flows to the central hole of the sleeve 25 and the central oil hole 11 of the crankshaft 1 in sequence through the radial through hole.

[0037] The impeller 21 shaft is connected with the crankshaft 1 through a sleeve 25. The sleeve 25 is a hollow straight cylinder structure, and a radial through hole can be arranged on the side wall. In this way, after the lubricating oil is pressurized by the impeller 21, it enters the sleeve 25 through the radial through hole, and then is guided to the central oil hole 11.

[0038] Preferably, the radial through hole is arranged in the tangential direction of the sleeve 25. In addition, the radial through hole is arranged in multiple in the axial and / or circumferential direction, and is uniformly distributed.

[0039] The sleeve 25 is fixedly connected to the tail end of the crankshaft 1, and can rotate the oil supply device with the rotation of the compressor crankshaft 1. At the same time, a radial or even tangential through-flow hole is designed at the tail end of the sleeve 25 to reduce the flow resistance of the lubricating oil and increase the oil supply at the inlet of the crankshaft 1.

[0040] The sleeve 25 is in interference fit with the crankshaft 1 and the central oil hole 11. A radial through hole is arranged on the upper part of the sleeve 25, through which the lubricating oil can enter the lower end of the crankshaft 1 and enter the central oil hole 11 of the crankshaft 1. The sleeve 25 and the multi-stage impeller 21 are fixed to realize the concentric rotation of the impeller 21 and the crankshaft 1.

[0041] Through the interference fit connection between the sleeve 25 and the crankshaft 1, the impeller 21 mechanism can rotate with the crankshaft 1, which can greatly reduce the mechanical work loss of the entire compressor. At the same time, although the use of the impeller 21 mechanism increases a part of the work loss, the overall use of the oil supply mode of increasing pressure difference can increase the kinetic energy of the fluid through the change of the pressure gradient, reduce the flow resistance of the lubricating oil, thereby reducing the indicated power loss of the compressor, reducing the power of the compressor, and improving the energy efficiency of the compressor.

[0042] In some embodiments, the impeller 21 is a closed impeller, which includes a disc 211, a hub 214, blades 213, and a cover plate 212. The disc 211 is provided with an axial hole in the center. The hub 214 is fixed to the disc 211 and communicates with the axial hole. The cover plate 212 is annular and arranged opposite to the disc 211. The blades 213 are arranged between the disc 211 and the cover plate 212 in a uniform distribution. The central hole of the cover plate 212 constitutes the inlet of the impeller 21. Adjacent two blades 213, the cover plate 212 and the disc 211 form a fluid passage, and the outlet of the impeller 21 is formed at the outer periphery of the disc 211. Preferably, the cover plate 212 is an arc-shaped plate with a concave shape.

[0043] The use of the closed impeller 21 structure can achieve better pressurized oil supply and improve the oil supply. Especially, the cover plate 212 is an arc-shaped plate with a concave shape, which reduces the flow resistance of the lubricating oil and reduces energy loss. The shape of the blade 213 can be a right-angle blade 213 structure as shown in the figure, or can be replaced by a streamline blade 213 structure.

[0044] In some embodiments, the impeller assembly 2 is provided with two impellers 21, and the upstream impeller 21 is larger in size than the downstream impeller 21.

[0045] When the compressor is working, the primary impeller 21 and the secondary impeller 21 will rotate to change the pressure gradient, thereby generating a pressure difference to increase the oil supply. The primary impeller 21 is the upstream impeller 21, and the secondary impeller 21 is the downstream impeller 21. First, the lubricating oil at the bottom of the compressor is centrifugally sucked into the primary impeller 21 by the rotation at the bottom of the primary impeller 21, and a negative pressure area is generated around the blades 213 of the primary impeller 21. Fluid flow will move from high pressure to low pressure, so that the lubricating oil will flow along the blades 213 and flow outward, changing the flow direction of the lubricating oil. Due to the rotation of the rotating impeller 21, the pressure is changed, the driving force of the fluid is increased, and the flow of the lubricating oil is increased. The lubricating oil will flow into the central area of the primary impeller 21 and the secondary impeller 21, and the lubricating oil in the central area can enter from the bottom of the secondary impeller 21. Through the centrifugal action of the blades 213, the pressure is changed in two stages, the total pressure difference between the inlet and the outlet is increased, thereby increasing the oil supply at the inlet of the crankshaft 1 and improving the fluid lubrication of the compressor.

[0046] At the same time, the above-mentioned impeller 21 is a central symmetric structure, which avoids the occurrence of asymmetric impact phenomenon during rotation, makes the oil supply at the bottom of the compressor more stable, reduces the vibration and noise of the compressor, and improves the comprehensive performance of the compressor.

[0047] The sizes of the primary and secondary impellers 21 can be the same, or the impellers 21 can be combined according to the levels, and the primary impeller 21 is larger than the secondary impeller 21, so that the entire oil supply mechanism presents a gradient change.

[0048] According to another aspect of the present application, a pump body assembly is provided, which comprises the oil supply assembly as described above.

[0049] According to still another aspect of the present application, a scroll compressor is provided, which comprises the oil supply assembly as described above or the pump body assembly as described above.

[0050] By two-stage or more-stage blade 213 rotation compression, the pressure of the existing oil pool is changed, the inlet pressure of the oil way of the crankshaft 1 is increased, and the oil supply of the compressor is increased through pressure difference oil supply. At the same time, the pressure difference oil supply reduces the loss of work done by the compressor, which can reduce the indicated power consumption loss of the compressor, thereby improving the performance of the compressor, improving the oil supply, improving the energy efficiency of the compressor, and further improving the comprehensive performance of the compressor. Two-stage or more-stage pressure-increasing oil supply can also effectively reduce the cost of the compressor and improve the market competitiveness.

[0051] It is easy for those skilled in the art to understand that the above-mentioned embodiments can be freely combined and superimposed without conflict.

[0052] The above description is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above description is only the preferred embodiment of the present application, and it should be pointed out that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can be made, and these improvements and variations should be regarded as the protection scope of the present application.

Claims

1. An oil supply assembly for supplying lubricating oil to the central oil hole (11) of the crankshaft (1) of a scroll compressor, characterized in that, include: At least two impeller assemblies (2), each impeller assembly (2) includes a flow channel and an impeller (21), the impeller (21) being disposed in the flow channel; the inlet (23) and outlet of the flow channel are disposed at both axial ends of the impeller (21), the flow channel also includes an arc-shaped section (22), the lubricating oil enters the impeller (21) axially through the inlet (23) of the flow channel, leaves the impeller (21) radially, and is discharged from the outlet (24) of the flow channel through the arc-shaped section (22); All the impeller assemblies (2) are arranged to overlap along the axial direction of the impeller (21); the outlet (24) of the upstream flow channel in two adjacent flow channels is connected to the inlet (23) of the downstream flow channel; the outlet of the downstream impeller assembly (2) is connected to the central oil hole (11) of the crankshaft (1); The oil supply assembly also includes a sleeve (25), the shaft of the impeller (21) is fixedly connected to the crankshaft (1) via the sleeve (25); the sleeve (25) is provided with a radial through hole, and the lubricating oil flows sequentially to the central hole of the sleeve (25) and the central oil hole (11) of the crankshaft (1) after passing through the radial through hole.

2. The oil supply assembly according to claim 1, characterized in that, All the impellers (21) are coaxially arranged and fixedly connected to the crankshaft (1).

3. The oil supply assembly according to claim 1, characterized in that, The radial through hole is provided along the tangential direction of the sleeve (25).

4. The oil supply assembly according to claim 1, characterized in that, The radial through holes are provided in multiple directions along the axial and / or circumferential directions and are evenly distributed.

5. The oil supply assembly according to any one of claims 1-4, characterized in that, The impeller (21) is a closed impeller, which includes a disc (211), a hub (214), blades (213), and a cover plate (212). The disc (211) has a shaft hole at its center. The hub (214) is fixed on the disc (211) and communicates with the shaft hole. The cover plate (212) is annular and is arranged opposite to the disc (211). There are multiple blades (213) evenly distributed between the disc (211) and the cover plate (212). The central hole of the cover plate (212) forms the inlet of the impeller (21). Two adjacent blades (213), the cover plate (212), and the disc (211) form a fluid channel, and the outlet of the impeller (21) is formed at the outer periphery of the disc (211).

6. The oil supply assembly according to claim 5, characterized in that, The cover plate (212) is a concave arc-shaped plate.

7. The oil supply assembly according to claim 5, characterized in that, When there are two impeller assemblies (2), the size of the upstream impeller (21) is larger than that of the downstream impeller (21).

8. A pump body assembly, characterized in that, Includes the oil supply assembly as described in any one of claims 1-7.

9. A scroll compressor, characterized in that, Includes the oil supply assembly as described in any one of claims 1-7 or the pump body assembly as described in claim 8.

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