Oil pumping structure of variable-frequency totally-enclosed refrigeration compressor

Abstract

The utility model relates to the technical field of mechanical engineering, in particular to a liquid variable-volume machine. According to the technical scheme, the oil pumping structure of the frequency conversion totally-enclosed refrigeration compressor comprises a pump body power system, an oil pumping device and a crankcase, the pump body power system is arranged above the oil pumping device and comprises a crankshaft, a rotor and a stator, the crankshaft is located above the rotor and the stator, and the crankshaft is located above the rotor and the stator. The rotor and the stator are fixedly connected to the crankcase; the oil pumping device comprises a spiral rod and a fixed shaft rod, the upper end of the spiral rod is fixedly connected with the rotor, and an oil pool is further arranged below the oil pumping device. The problems that in the prior art, under the low rotating speed, the oil pumping capacity and the oil quantity control flexibility are insufficient, the rotating speed application range is narrow, and the oil pumping efficiency is insufficient are solved, the oil pumping structure of the frequency conversion fully-closed refrigeration compressor is provided, and the purposes of high efficiency, high flexibility and large rotating speed application range are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical engineering technical field, concretely relates to liquid variable capacity type machinery. BACKGROUND

[0002] Closed reciprocating compressor is the core of household refrigeration system, and its lubrication is a key problem because lubrication is directly related to mechanical loss, wear and reliability of the compressor. The oil pumping system provides lubrication for the friction contact of the compressor power mechanical structure, bearings and each part prone to pitting and wear during machine operation, such as shaft hole, piston, connecting rod, etc. In addition to reducing the loss of parts lubrication, the oil pumping system also plays a certain cooling effect by bringing the heat from the high temperature area to the shell. In addition to the above two points, it also plays a sealing role between the piston and the cylinder, which has far-reaching significance for the overall performance, operating life and reliability of the refrigeration compressor. Especially for variable frequency closed refrigeration compressor, its speed is generally between 1000-6000rmp, and due to the effect of centrifugal force, the mass flow rate of lubricating oil is linearly proportional to the speed of the crankshaft. At a lower speed (<2000rpm), more time is often needed to reach a steady state condition, which greatly affects the total mass flow rate of the lubricating oil. It is challenging to provide and maintain lubricating oil at a low speed (<2000rpm) for variable frequency or variable speed sealed reciprocating compressors.

[0003] For example, the Chinese patent with publication number CN205677795U discloses a kind of oil pumping device for fully enclosed variable frequency compressor, provides the following technical scheme, discloses a kind of oil pumping device for fully enclosed variable frequency compressor, including crankshaft, oil suction pipe, stator and shell, oil suction pipe is sleeved in the outside of lower part of crankshaft, oil suction pipe is provided with oil suction pipe core, crankshaft, oil suction pipe, oil suction pipe core and stator are located on the same axis, crankshaft rotates synchronously with oil suction pipe, oil suction pipe core is fixed on stator or shell by suspension spring.The oil pumping device in the utility model, oil resistance is small, can guarantee the oiling amount of variable frequency compressor at low speed and high speed, realizes lubrication and cooling, improves the service life of compressor. However, the above-mentioned oil pumping device for fully enclosed variable frequency compressor has poor pump oil capacity and oil quantity control flexibility at low speed, and the speed application range is narrow. UTILITY MODEL CONTENTS

[0004] The present application solves the problem of insufficient pump oil capacity and oil quantity control flexibility at low speed, narrow speed application range and low pump oil efficiency in the prior art, and proposes a pump oil structure for variable frequency fully enclosed refrigeration compressor, achieving the purposes of high efficiency, high flexibility and large speed application range.

[0005] To achieve the above-mentioned purposes, the present application adopts the following technical scheme:

[0006] An oil pumping structure of a variable frequency hermetic refrigeration compressor, comprising a pump body power system, an oil pumping device and a crankcase, the pump body power system being arranged above the oil pumping device, the pump body power system comprising a crankshaft, a rotor and a stator, the crankshaft being above the rotor and the stator, the crankshaft, the rotor and the stator being fixedly connected to the crankcase; the oil pumping device comprising a spiral rod and a fixed shaft rod, the upper end of the spiral rod being fixedly connected to the rotor, and an oil pool being further arranged below the oil pumping device.

[0007] During operation of the refrigeration compressor, the rotor in the pump body power system drives the spiral rod in the oil pumping device to rotate at the same speed, while the fixed shaft rod remains unchanged. Under the concentric and coaxial rotation of the spiral rod, the oil in the oil pool is driven to rise to the upper end of the crankshaft through the outer spiral oil pumping channel formed by the inner spiral oil pumping channel between the inner wall of the spiral rod and the outer wall of the fixed shaft rod and the spiral oil hole channel in the wall of the spiral rod. The two kinds of oil pumping channels can well enhance the oil pumping capacity at low speed, improve the flexibility of oil quantity control, and broaden the application range of the speed.

[0008] As a preferred, the spiral rod and the fixed shaft rod are kept in the same concentric and coaxial rotation and the same speed rotation, and the effective lengths of the spiral rod and the fixed shaft rod are the same. The lower end of the spiral rod and the lower end of the fixed shaft rod are immersed in the oil pool.

[0009] The advantage is that, by keeping the spiral rod and the fixed shaft rod in the same concentric and coaxial rotation and the same speed rotation, the gap between the spiral rod and the fixed shaft rod can be minimized, thereby enhancing the sealing effect and preventing the leakage of lubricating oil and refrigerant during compression. Meanwhile, under the condition of concentric and coaxial rotation, the pressure and temperature inside the compressor can be maintained stable, and the compression efficiency can be improved. From the perspective of machine maintenance, keeping the spiral rod and the fixed shaft rod in the same speed rotation can reduce the relative movement between the spiral rod and the fixed shaft rod, thereby reducing the wear rate, prolonging the service life of the equipment, and reducing the noise and vibration caused by wear.

[0010] The advantage is that, the design of the same concentric and coaxial rotation and the same speed rotation can ensure the uniform distribution of lubricating oil between the spiral rod and the fixed shaft rod, improve the lubrication effect, and reduce friction and wear. Moreover, by keeping the effective lengths of the spiral rod and the fixed shaft rod the same, the engagement between them is uniform, which ensures the uniform flow and compression of refrigerant during compression, helps to reduce the pressure fluctuation and temperature gradient during compression, and improves the compression efficiency. This design cooperates with the design of the same concentric and coaxial rotation and the same speed rotation to improve the compression efficiency, enhance the stability of the compressor operation, prolong the service life of the equipment, and reduce the maintenance cost.

[0011] As a preferred, the pump oil device is further provided with a snap spring, which fixedly connects the fixed shaft rod and the spiral rod, while keeping an oil film gap between the fixed shaft rod and the spiral rod.

[0012] The advantage is that the fixed shaft rod and the spiral rod are fixedly connected by the snap spring, and there is a certain oil film gap between the fixed shaft rod and the spiral rod, which together ensures the efficient operation of the refrigeration compressor. The fixed connection reduces the relative movement between the components, reducing energy loss; while the oil film gap optimizes the lubrication and cooling effect, further improving the operating efficiency of the compressor. By reducing friction and wear, and adapting to thermal expansion, this design significantly enhances the durability of the compressor. This means that the compressor can maintain high performance for a longer period of time, reducing the frequency of maintenance and replacement of parts. The fixed connection of the snap spring and the setting of the oil film gap also help to reduce the noise and vibration level of the compressor. Stable connection reduces the looseness and impact between components, while the lubrication of the oil film reduces friction noise. The oil film gap not only provides necessary lubrication, but also plays a sealing role. It prevents the leakage of lubricating oil and refrigerant, ensuring the stability of pressure and temperature inside the compressor. In addition, the snap spring as a standardized connector makes the assembly process of the fixed shaft rod and the spiral rod more simple and fast. At the same time, the design of the oil film gap also simplifies maintenance work, because it reduces the need for component damage and replacement due to friction and wear.

[0013] As a preferred, the spiral rod inner wall and the fixed shaft rod outer wall are provided with a plurality of thread structures, and the thread structures are always distributed between the spiral rod inner wall and the fixed shaft rod outer wall. A plurality of thread structures are connected to each other to form an inner spiral oil pumping channel.

[0014] The advantage is that the mutual connection of the thread structures forms one or more continuous oil pumping channels in the inner spiral area. These channels allow lubricating oil to circulate inside the compressor, ensuring that each component is adequately lubricated. The presence of thread structures increases the contact area between the spiral rod and the fixed shaft rod, thereby improving the efficiency of oil pumping. When the spiral rod rotates, the thread structure can more effectively push the lubricating oil to flow along the oil pumping channel. The design of the thread structure helps to maintain a stable lubricating oil film between the spiral rod and the fixed shaft rod. This layer of oil film can reduce friction and wear between components, while providing necessary cooling and sealing effect.

[0015] Meanwhile, the design of the inner helical pump oil passage ensures that all components inside the compressor are adequately lubricated. This helps to reduce friction and wear, extending the service life of the equipment. The design of the inner helical pump oil passage also optimizes the overall performance of the compressor. It improves the operational efficiency of the compressor, reduces energy consumption, and enhances the stability and reliability of the equipment, thus reducing the frequency of repairs and replacement of parts due to malfunctions. This helps to reduce maintenance costs and improve the availability of the equipment.

[0016] As a preferred embodiment, a plurality of helical oil hole passages are further provided in the wall of the screw rod, which have the same effective length as the screw rod. The helical oil hole passages pass through from the bottom end to the upper end of the screw rod, and the plurality of helical oil hole passages are independent of each other and collectively form an outer helical pump oil passage.

[0017] The advantage of this is that by providing a plurality of helical oil hole passages in the wall of the screw rod, the flow path of the oil in the screw rod is increased, thereby improving the oil pumping capacity. When the screw rod rotates, the oil is effectively transported to the required parts through these helical oil hole passages. The helical oil hole passages not only play a lubricating role in the circulation of the oil, but also help to carry away the heat generated during the operation of the compressor. This helps to reduce the working temperature of the compressor and improve the cooling efficiency. The design of the helical oil hole passages increases the material distribution in the wall of the screw rod, which helps to improve the structural strength of the screw rod. This enables the screw rod to withstand greater mechanical and thermal stresses, extending the service life of the equipment.

[0018] The advantage of this is that the design of the outer helical pump oil passage optimizes the lubrication and cooling system of the compressor, improving the overall performance of the compressor. This includes improving compression efficiency, reducing energy consumption, enhancing stability and reliability, etc. This design improves the durability and stability of the compressor, thus reducing the frequency of repairs and replacement of parts due to malfunctions. This helps to reduce maintenance costs and improve the availability of the equipment. The design of the helical oil hole passage enables the compressor to adapt to different types of refrigerants and working conditions. Whether it is a high temperature and high pressure or a low temperature and low pressure environment, the compressor can maintain high efficiency and stable operation. At the same time, the standardized design of the helical oil hole passage also helps to simplify the assembly process.

[0019] As a preferred embodiment, the inner helical pump oil passage and the outer helical pump oil passage are concentric and coaxial, and independent of each other. The advantage of this is that the concentric and coaxial design of the inner and outer helical pump oil passages enables the oil to flow more smoothly during extraction. This design reduces the resistance of the oil during flow, thereby improving the oil pumping efficiency. The concentric and coaxial design makes the inner and outer helical pump oil passages more stable in structure. This stability helps to reduce damage to the equipment caused by vibration or impact, improving the durability of the equipment.

[0020] The inner and outer spiral pump oil channels are independent of each other, but jointly extract oil, which helps to ensure that each component in the pump is fully lubricated. This design reduces friction and wear between components, prolonging the service life of the equipment. Since the inner and outer spiral pump oil channels are independent of each other, their extraction speed and flow can be controlled separately. This design allows the pump-type equipment to have higher precision and controllability when extracting oil.

[0021] At the same time, the double-spiral pump oil channel can improve the oil pumping efficiency, which means that the equipment consumes less energy under the same extraction amount. This design helps to reduce energy consumption, achieve energy-saving goals, and the pump oil structure can adapt to different working environments and extraction requirements. Whether it is in harsh environments with high viscosity, sand, and gas, or in situations where precise control of extraction speed and flow is required, this equipment can perform well.

[0022] Compared with the prior art, the utility model has the advantages of.

[0023] When the refrigeration compressor is running, the rotor in the pump body power system drives the spiral rod in the pump oil device to rotate at the same speed, and the fixed shaft rod remains unchanged under the action of the clamp spring. The inner wall of the spiral rod and the outer wall of the fixed shaft rod move relative to each other. The thread structure provided between the combination piece is driven by viscous force to mechanically push the oil in the oil pool upward, and the oil in the oil pool is driven upward to the upper end outlet of the crankshaft through the inner spiral pump oil channel between the inner wall of the spiral rod and the outer wall of the fixed shaft rod, and the spiral oil hole channel existing in the spiral rod wall. The two kinds of pump oil channels can well enhance the pumping capacity at low speed, improve the flexibility of oil quantity control, and widen the application range of speed. The pump oil structure of the utility model further widens the operating speed range due to the existence of the double spiral channel, and the pumping capacity at low speed (<2000rmp) can still meet the lubrication requirements of parts. The structure has more spiral channels, and the spiral structure can be optimized to realize flexible control of the pump oil quantity. At the same time, the structure of the utility model is relatively simple, and the improved pump oil structure can be completed by simply processing and installing on the traditional pump oil structure. It is stable, flexible, efficient and economical, and is suitable for variable frequency closed refrigeration compressors. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a sectional view of the pump oil device of the utility model.

[0025] Figure 2 is a structural schematic view of the pump oil device of the utility model.

[0026] Figure 3 is an installation schematic view of the pump oil structure of the utility model on a variable frequency compressor.

[0027] In the figure: 2-1, spiral rod, 2-2, fixed shaft rod, 2-1.1, spiral rod inner wall, 2-1.2, outer spiral pumping oil channel, 2-2.1 fixed shaft rod connecting hole, 2-2.2, fixed shaft rod body, 3-1, crankshaft, 3-2, crankcase, 3-3, rotor, 3-4, oil pool, 3-5, stator, 3-6, pumping oil device, 3-7, snap spring. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in combination with the drawings. The proportions of various components are not drawn according to the true proportions, and the proportions and sizes shown in the drawings should not limit the essential technical scheme of the present disclosure. These embodiments do not describe all the details, nor limit the present disclosure to the specific embodiments described.

[0029] Referring to Figures 1-3 As shown in the figure, a pumping oil structure of a variable frequency fully-enclosed refrigeration compressor includes a pumping body power system, a pumping oil device and a crankcase, the pumping body power system is arranged above the pumping oil device, the pumping body power system includes a crankshaft, a rotor and a stator, the crankshaft is located above the rotor and the stator, the crankshaft, the rotor and the stator are all fixedly connected to the crankcase; the pumping oil device includes a spiral rod and a fixed shaft rod, the upper end of the spiral rod is fixedly connected to the rotor, and an oil pool is further arranged below the pumping oil device.

[0030] As shown in the figure, a pumping oil structure of a variable frequency fully-enclosed refrigeration compressor includes a pumping body power system, a pumping oil device and a crankcase, the pumping body power system is arranged above the pumping oil device, the pumping body power system includes a crankshaft, a rotor and a stator, the crankshaft is located above the rotor and the stator, the crankshaft, the rotor and the stator are all fixedly connected to the crankcase; the pumping oil device includes a spiral rod and a fixed shaft rod, the upper end of the spiral rod is fixedly connected to the rotor, and an oil pool is further arranged below the pumping oil device. Figure 2 As shown in the figure, a pumping oil structure of a variable frequency fully-enclosed refrigeration compressor includes a pumping body power system, a pumping oil device and a crankcase, the pumping body power system is arranged above the pumping oil device, the pumping body power system includes a crankshaft, a rotor and a stator, the crankshaft is located above the rotor and the stator, the crankshaft, the rotor and the stator are all fixedly connected to the crankcase; the pumping oil device includes a spiral rod and a fixed shaft rod, the upper end of the spiral rod is fixedly connected to the rotor, and an oil pool is further arranged below the pumping oil device. Figure 3 As shown in the figure, a pumping oil structure of a variable frequency fully-enclosed refrigeration compressor includes a pumping body power system, a pumping oil device and a crankcase, the pumping body power system is arranged above the pumping oil device, the pumping body power system includes a crankshaft, a rotor and a stator, the crankshaft is located above the rotor and the stator, the crankshaft, the rotor and the stator are all fixedly connected to the crankcase; the pumping oil device includes a spiral rod and a fixed shaft rod, the upper end of the spiral rod is fixedly connected to the rotor, and an oil pool is further arranged below the pumping oil device. When the refrigeration compressor is running, the rotor 3-3 in the pumping body power system drives the spiral rod 2-1 in the pumping oil device 3-6 to rotate at the same speed, and the fixed shaft rod 2-2 remains unchanged. Under the concentric and coaxial rotation of the spiral rod 2-1, the oil in the oil pool 3-4 is driven to rise to the upper end outlet of the crankshaft 3-1 through the outer spiral pumping oil channel 2-1.2 formed by the inner spiral pumping oil channel between the inner wall of the spiral rod 2-1 and the outer wall of the fixed shaft rod 2-2 and the spiral oil hole channel existing in the wall of the spiral rod 2-1. The two kinds of pumping oil channels can well enhance the pumping oil capacity at low speed, improve the flexibility of oil quantity control and broaden the application range of the speed.

[0031] In the present embodiment, as shown in Figure 2 the helical rod 2-1 and the fixed shaft rod 2-2 are kept rotating concentrically and coaxially and at the same speed, and the effective lengths of the helical rod 2-1 and the fixed shaft rod 2-2 are the same. The lower end of the helical rod 2-1 and the lower end of the fixed shaft rod 2-2 are both immersed in the oil pool 3-4.

[0032] By keeping the helical rod 2-1 and the fixed shaft rod 2-2 rotating concentrically and coaxially and at the same speed, the gap between the helical rod 2-1 and the fixed shaft rod 2-2 can be minimized, thereby enhancing the sealing effect and preventing the leakage of lubricating oil and refrigerant during compression. At the same time, in the case of concentricity and coaxiality, it is also helpful to maintain the stability of the pressure and temperature inside the compressor and improve the compression efficiency. From the perspective of machine maintenance, keeping the helical rod 2-1 and the fixed shaft rod 2-2 rotating at the same speed can reduce the relative motion between the helical rod 2-1 and the fixed shaft rod 2-2, which can well reduce the wear rate and prolong the service life of the equipment, and also has the effect of reducing the noise and vibration caused by wear.

[0033] Another effect of the design of rotating concentrically and coaxially at the same speed is to ensure that the lubricating oil is evenly distributed between the helical rod 2-1 and the fixed shaft rod 2-2, improving the lubrication effect and reducing friction and wear. And by keeping the effective lengths of the helical rod 2-1 and the fixed shaft rod 2-2 the same, the engagement between them is uniform, which ensures the uniform flow and compression of the refrigerant during compression, helps to reduce the pressure fluctuation and temperature gradient during compression, and improves the compression efficiency. This design cooperates with the design of rotating concentrically and coaxially at the same speed to improve the compression efficiency, enhance the stability of the compressor operation, prolong the service life of the equipment, and reduce the maintenance cost.

[0034] As shown in Figure 3 the pump oil device 3-6 is also provided with a snap spring 3-7, which fixes and connects the fixed shaft rod 2-2 and the helical rod 2-1, while keeping an oil film gap between the fixed shaft rod 2-2 and the helical rod 2-1.

[0035] The fixed shaft rod 2-2 and the spiral rod 2-1 are fixedly connected by the snap spring 3-7, and there is a certain oil film gap between the fixed shaft rod 2-2 and the spiral rod 2-1, which together ensures the high efficiency operation of the refrigeration compressor. The fixed connection reduces the relative movement between the components, reduces the energy loss; while the oil film gap optimizes the lubrication and cooling effect, further improves the operating efficiency of the compressor. By reducing friction and wear, and adapting to thermal expansion, this design significantly enhances the durability of the compressor. This means that the compressor can maintain high performance operation for a longer period of time, reducing the frequency of maintenance and replacement of parts. The fixed connection of the snap spring 3-7 and the setting of the oil film gap also help to reduce the noise and vibration level of the compressor. Stable connection reduces the looseness and impact between components, while the lubrication of the oil film reduces friction noise. The oil film gap not only provides the necessary lubrication, but also plays a sealing role. It prevents the leakage of lubricating oil and refrigerant, ensuring the stability of the pressure and temperature inside the compressor. In addition, the snap spring 3-7 as a standardized connector makes the assembly process of the fixed shaft rod 2-2 and the spiral rod 2-1 more simple and fast. At the same time, the design of the oil film gap also simplifies the maintenance work, because it reduces the damage and replacement demand of the components caused by friction and wear.

[0036] As shown in Figure 2 The inner wall of the spiral rod 2-1.1 and the outer wall of the fixed shaft rod 2-2 are provided with a plurality of thread structures, and the thread structures are always distributed between the inner wall of the spiral rod 2-1.1 and the outer wall of the fixed shaft rod 2-2. The plurality of thread structures are connected to each other to form one or more continuous pump oil channels in the inner spiral area.

[0037] The connection of the thread structures forms one or more continuous pump oil channels in the inner spiral area. These channels allow lubricating oil to circulate inside the compressor, ensuring that each component is adequately lubricated. The presence of thread structures increases the contact area between the spiral rod 2-1 and the fixed shaft rod 2-2, thereby improving the pump oil efficiency. When the spiral rod 2-1 rotates, the thread structure can more effectively push the lubricating oil to flow along the pump oil channel. The design of the thread structure helps to maintain a stable lubricating oil film between the spiral rod 2-1 and the fixed shaft rod 2-2. This layer of oil film can reduce friction and wear between components, while providing the necessary cooling and sealing effect.

[0038] At the same time, the design of the inner spiral pump oil channel ensures that each component inside the compressor is adequately lubricated. This helps to reduce friction and wear, extending the service life of the equipment. The design of the inner spiral pump oil channel also optimizes the overall performance of the compressor. It improves the operating efficiency of the compressor, reduces energy consumption, and enhances the stability and reliability of the equipment, thereby reducing the frequency of maintenance and replacement of parts due to malfunctions. This helps to reduce maintenance costs and improve the availability of the equipment.

[0039] In this embodiment, as shown in Figure 2 The four spiral oil hole channels are independent of each other and collectively form an outer spiral pump oil passage 2-1.2. In this embodiment, a circular fixed shaft rod connecting hole 2-2.1 is also provided above the fixed shaft rod 2-2. The fixed shaft rod 2-2 and the crankcase 3-2 are fixedly connected through the fixed shaft rod connecting hole 2-2.1. The fixed shaft rod body 2-2.2 is kept stationary under the action of the snap spring 3-7, so that relative movement occurs between the fixed shaft rod 2-2 and the spiral rod 2-1.

[0040] By providing four spiral oil hole channels in the wall of the spiral rod 2-1, the flow path of the oil in the spiral rod 2-1 is increased, thereby improving the oil pumping capacity. When the spiral rod 2-1 rotates, the oil is effectively transported to the required position through these spiral oil hole channels. The spiral oil hole channels not only play a lubricating role in the circulation of the oil, but also help to carry away the heat generated during the operation of the compressor. This helps to reduce the working temperature of the compressor and improve the cooling efficiency. The design of the spiral oil hole channels increases the material distribution in the wall of the spiral rod 2-1, which helps to improve the structural strength of the spiral rod 2-1. This enables the spiral rod 2-1 to withstand greater mechanical and thermal stresses, thereby prolonging the service life of the equipment.

[0041] The design of the outer spiral pump oil passage 2-1.2 optimizes the lubrication and cooling system of the compressor, thereby improving the overall performance of the compressor. This includes improving compression efficiency, reducing energy consumption, enhancing stability and reliability, etc. The design improves the durability and stability of the compressor, thereby reducing the frequency of maintenance and replacement of parts due to failure. This helps to reduce maintenance costs and improve the availability of the equipment. The design of the spiral oil hole channels enables the compressor to adapt to different types of refrigerants and working conditions. Whether it is a high temperature and high pressure environment or a low temperature and low pressure environment, the compressor can maintain efficient and stable operation. At the same time, the standardized design of the spiral oil hole channels also helps to simplify the assembly process.

[0042] The inner spiral pump oil passage is concentric and coaxial with the outer spiral pump oil passage 2-1.2, and is independent of each other. In this utility model, the concentric and coaxial design of the inner and outer spiral pump oil passages 2-1.2 enables the oil to flow more smoothly during extraction. This design reduces the resistance of the oil during flow, thereby improving the oil pumping efficiency. The concentric and coaxial design makes the inner and outer spiral pump oil passages 2-1.2 more stable in structure. This stability helps to reduce damage to the equipment due to vibration or impact, thereby improving the durability of the equipment.

[0043] The inner and outer helical pump oil channels are independent of each other, but they jointly extract oil, which helps to ensure that all parts in the pump are fully lubricated. This design reduces friction and wear between parts, prolonging the service life of the equipment. Since the inner and outer helical pump oil channels are independent of each other, their extraction speed and flow rate can be controlled separately. This design makes the pump-type equipment have higher precision and controllability when extracting oil.

[0044] At the same time, the double-spiral pump oil channel can improve the oil pumping efficiency, which means that the equipment consumes less energy under the same extraction amount. This design helps to reduce energy consumption, achieve energy-saving goals, and the pump oil structure can adapt to different working environments and extraction requirements. Whether it is in harsh environments with high viscosity, sand, and gas, or in situations where precise control of extraction speed and flow rate is required, this equipment can perform well.

[0045] A pump oil structure of a variable frequency fully enclosed refrigeration compressor, when the refrigeration compressor is running, the rotor 3-3 in the pump body power system drives the helical rod 2-1 in the pump oil device 3-6 to rotate at the same speed, the fixed shaft rod 2-2 is fixed and unchanged under the action of the clamp spring 3-7, the inner wall 2-1.1 of the helical rod and the outer wall of the fixed shaft rod 2-2 move relatively, the thread structure between the combination is driven by the viscous force to mechanically push the oil in the oil pool 3-4 to rise, and the oil in the oil pool 3-4 is driven to rise to the upper end outlet of the crankshaft 3-1 through the inner helical pump oil channel between the inner wall 2-1.1 of the helical rod and the outer wall of the fixed shaft rod 2-2, and the outer helical pump oil channel 2-1.2 existing in the wall of the helical rod 2-1. The inner and outer pump oil channels can well enhance the oil pumping capacity at low speed, improve the flexibility of oil quantity control, and widen the application range of speed. The pump oil structure of the utility model further widens the speed range of operation due to the existence of double spirals, especially for the oil pumping capacity at low speed (<2000rmp), which can still meet the lubrication requirements of parts, and the structure has more spirals, which can optimize the spiral structure to realize flexible control of the pump oil quantity. At the same time, the structure of the utility model is relatively simple, and the improved pump oil structure can be completed by simply processing and installing on the traditional pump oil structure. It is stable, flexible, efficient, economical, and suitable for variable frequency enclosed refrigeration compressors.

[0046] In another embodiment, the commonly used viscous pump-pump oil structure of the compressor is as follows Figure 1As shown, including spiral rod 1-1, oil suction sleeve 1-2, fixed support 1-3, compressor operation, spiral rod 1-1 is placed in the oil suction sleeve 1-2, the lower end is fixed on the stator 3-5 motor through the fixed support 1-3 with the snap spring 3-7, and a certain oil immersion depth is maintained, the upper end is fixed on the rotor 3-3 or the lower shaft of the crankshaft 3-1, and the coaxial concentricity is maintained. The rotor 3-3 rotates to drive the oil suction sleeve 1-2 to rotate at the same speed, the spiral rod 1-1 remains stationary under the action of the fixed support 1-3 and the snap spring 3-7, and the relative motion between the two can also exist under the condition of low speed to pump out the oil. The lubricating oil is pumped to the outlet of the crankshaft 3-1 and reaches the required lubricated mechanical parts in the compressor under the action of centrifugal force. Assuming that the viscous force dominates, the flow in the pump is simplified as a Couette flow model, and the simplified calculation formula of the pumped oil volume is as follows:

[0047]

[0048] Wherein: b represents the width of the spiral groove;

[0049] ω represents the rotation angular velocity vector;

[0050] h represents the depth of the spiral groove;

[0051] θ represents the helix angle;

[0052] μ is the fluid molecular viscosity coefficient;

[0053] ρ is the density;

[0054] g is the acceleration of gravity;

[0055] q v Mass flow.

[0056] As can be seen from the formula, the first term represents the volume flow value when the velocity is linearly distributed along the cross-sectional direction of the spiral without gravity, which represents the driving effect of viscous force on volume flow; The second term represents the resistance of gravity to volume flow. As described in the formula, the increase of ω reduces the viscous driving force and increases the resistance of gravity, and q v decreases; the change of b has little effect on viscous force, only the cross-sectional area changes linearly, so the volume flow increases with the increase of b; the viscous driving force and the resistance of gravity change at different rates with h and θ, so there is an optimal spiral structure to make q v reach the maximum.

[0057] The centrifugal pump oil structure is also a power component of the pump oil system commonly used in the compressor, but the structure is obviously affected by the rotating speed, and although the compressor can normally operate at a rotating speed of 3000-3600 rpm and has a low cost, the excessively affected speed leads to a very low pump oil amount at a low rotating speed (<2000 rpm), and the pump oil amount cannot meet the lubrication requirement of the refrigeration oil of the compressor parts, and therefore the pump body is not suitable for the variable frequency closed compressor with a low rotating speed.

[0058] In the embodiment, as shown in Figure 2 and Figure 3 , the technical problem to be solved by the utility model is to improve the oil amount supply at a low rotating speed, and the pump oil amount can also be adjusted and controlled by adjusting the spiral structure at a high rotating speed, the rotating speed service range of the pump oil system is widened, and the control amount flexibility at different rotating speeds is improved. The structure does not need an external steel oil suction sleeve, has a low manufacturing cost, and is a high-efficiency, flexible, low-cost and wide-range variable frequency closed refrigeration compressor pump oil structure.

[0059] In the embodiment, as shown in Figure 2 and Figure 3 , a pump oil structure of a variable frequency closed refrigeration compressor comprises a crankcase 3-2, a crankshaft 3-1, a rotor 3-3, a stator 3-5, a spiral rod 2-1, a fixed shaft rod 2-2, a shell, an oil pool 3-4 and a fixing member. The crankshaft 3-1, the stator 3-5 and the rotor 3-3 are fixed to the crankcase 3-2 and are coaxial with the shaft hole of the crankcase 3-2, the upper end of the spiral rod 2-1 is fixed to the lower long shaft of the rotor 3-3 or the crankshaft 3-1 and is coaxial, the lower end is placed in the oil pool 3-4 to maintain a certain oil immersion depth, the fixed shaft rod 2-2 is placed in the center of the spiral rod 2-1 and is fixed in the inner hole of the spiral rod 2-1 by the fixing member to maintain coaxial, and the fixed shaft rod 2-2 and the spiral rod 2-1 maintain a certain gap, and the thread structure is arranged between the outer wall of the fixed shaft rod 2-2 and the inner wall 2-1.1 of the spiral rod. In the embodiment, the snap spring 3-7 is used as the fixing member.

[0060] The thread structure is located on the inner wall 2-1.1 of the spiral rod and the outer wall of the fixed shaft rod 2-2, or the inner wall 2-1.1 of the spiral rod is smooth, the outer wall of the fixed shaft rod 2-2 is provided with the thread structure, and the thread structure is always filled between the spiral rod 2-1 and the fixed shaft rod 2-2.

[0061] When the compressor motor starts, the rotor 3-3 drives the crankshaft 3-1 to rotate at the same speed, the crankshaft 3-1 drives the oil pumping spiral rod 2-1 to rotate at the same speed, and the fixed shaft rod 2-2 is fixed by the fixing piece and remains stationary, the inner wall 2-1.1 of the spiral rod and the outer wall of the fixed shaft rod 2-2 move relative to each other, and the thread structure provided between the combined parts is driven by the viscous force to mechanically push the oil in the oil pool 3-4 upwards, and the oil is spirally pumped up through the inner spiral oil channel between the inner wall 2-1.1 of the spiral rod and the outer wall of the fixed shaft rod 2-2, and reaches the upper end outlet of the crankshaft 3-1. At the same time, the spiral oil hole channel in the wall of the spiral rod 2-1 will also be driven by the centrifugal force and the viscous force under the rotation of the crankshaft 3-1 at the same speed to pump the oil in the oil pool 3-4 to the oil outlet hole of the crankshaft 3-1 through the external spiral channel, and the internal and external spiral channels of the oil liquid are connected in the crankshaft 3-1 and reach the oil outlet hole of the crankshaft 3-1, and under the action of centrifugal force, it provides lubrication for each mechanical part, and further ensures the stability of the operation of the variable frequency closed compressor and the working efficiency. The oil pumping structure of the utility model further widens the rotation speed range due to the existence of double spiral channels, especially for the oil pumping capacity under low speed (<2000rmp) which can still meet the lubrication requirements of parts, and the structure has more spiral channels, which can optimize the spiral structure to realize flexible control of the pumping capacity. At the same time, the structure of the utility model is relatively simple, and the improved oil pumping structure can be completed by simply processing and installing on the traditional oil pumping structure, which is stable, flexible, efficient and economical, and is suitable for variable frequency closed refrigeration compressor.

[0062] In the present embodiment, as Figure 3As shown, when the crankshaft 3-1 rotates, the synchronous belt drives the oil pumping device 3-6 (the spiral rod 2-1) to rotate, and the oil pumping device 3-6 (the fixed shaft rod 2-2) remains stationary under the fixing action of the snap spring 3-7, so that relative motion occurs between the two, the inner spiral oil groove between the inner wall 2-1.1 of the spiral rod and the outer wall of the fixed shaft rod 2-2 mechanically pushes the oil in the oil pool 3-4, enhancing the oil pumping capacity of the oil pumping structure. Within a certain range, the oil pumping capacity is proportional to the height of the screw size and inversely proportional to the tooth width, and the oil pumping capacity increases first and then decreases with the increase of the spiral angle, and there is an optimal spiral angle. When the spiral rod 2-1 rotates synchronously with the crankshaft 3-1, the outer spiral oil groove formed by the spiral oil hole provided in the wall of the spiral rod 2-1 will also extract the oil in the oil pool 3-4 under the joint driving of the centrifugal force and the viscous force. Within a certain range, its oil pumping capacity is proportional to the rotation speed and the cross-sectional area of the oil way, and also presents a trend of first increasing and then decreasing with the increase of the spiral angle. The two parts of the oil way jointly pump oil, and then the oil is discharged from the oil outlet hole at the top end of the crankshaft 3-1, and the lubricating oil is delivered to each part by the centrifugal force. This structure further enhances the oil pumping capacity at low speed (<2000rmp), and the inner and outer spiral channels are both affected by the geometric structure, so the control of the oil pumping capacity is more flexible, and the negative effects of the press caused by the excessive oil pumping capacity at high speed (>4000rmp) are avoided.

[0063] The utility model is not limited to the above-mentioned embodiment, no matter make any change in its shape or material composition, adopt the structure design provided by the utility model, it is a deformation of the utility model, should be considered that in the utility model protection scope.

Claims

1. An oil pumping structure of a variable frequency hermetic refrigeration compressor, characterized by, The pump body power system and the pump oil device (3-6) and the crankcase (3-2) are included, the pump body power system is arranged above the pump oil device (3-6), the pump body power system includes the crankshaft (3-1) and the rotor (3-3) and the stator (3-5), the crankshaft (3-1) is located above the rotor (3-3) and the stator (3-5), and the crankshaft (3-1) and the rotor (3-3) and the stator (3-5) are fixedly connected on the crankcase (3-2); the pump oil device (3-6) includes the spiral rod (2-1) and the fixed shaft rod (2-2), the upper end of the spiral rod (2-1) is fixedly connected with the rotor (3-3), and the pump oil device (3-6) is further provided with an oil pool (3-4) below.

2. The oil pumping structure of a variable frequency totally-enclosed cooling compressor according to claim 1, characterized in that, The spiral rod (2-1) and the fixed shaft rod (2-2) rotate at the same speed, and the effective lengths of the spiral rod (2-1) and the fixed shaft rod (2-2) are the same.

3. The oil pumping structure of a variable frequency totally-enclosed cooling compressor according to claim 1 or 2, characterized in that, The lower end of the spiral rod (2-1) and the lower end of the fixed shaft rod (2-2) are immersed in the oil pool (3-4).

4. The oil pumping structure of a variable frequency totally-enclosed cooling compressor according to claim 1, wherein, The pump oil device (3-6) is further provided with a snap spring (3-7), the snap spring (3-7) fixedly connects the fixed shaft rod (2-2) and the spiral rod (2-1), and an oil film gap is arranged between the fixed shaft rod (2-2) and the spiral rod (2-1).

5. The oil pumping structure of a variable frequency totally-enclosed refrigeration compressor according to claim 2, wherein A plurality of thread structures are arranged between the inner wall of the spiral rod (2-1.1) and the outer wall of the fixed shaft rod (2-2), and the thread structures are arranged between the entire inner wall of the spiral rod (2-1.1) and the outer wall of the fixed shaft rod (2-2).

6. The oil pumping structure of a variable frequency totally-enclosed refrigeration compressor according to claim 5, wherein The plurality of thread structures are connected to each other to form an inner spiral pump oil channel.

7. The oil pumping structure of a variable frequency totally-enclosed refrigeration compressor according to claim 2, wherein A plurality of spiral oil hole channels are further arranged in the wall of the spiral rod (2-1), and the spiral oil hole channels have the same effective length as the spiral rod (2-1).

8. The oil pumping structure of the variable frequency totally-enclosed refrigeration compressor according to claim 7, characterized in that, The spiral oil hole channels pass through from the bottom end to the upper end of the spiral rod (2-1), and the plurality of spiral oil hole channels are independent of each other and jointly form an outer spiral pump oil channel (2-1.2).

9. The pump oil structure of the variable frequency totally-enclosed refrigeration compressor according to claim 6 or 8, wherein, The inner spiral pump oil channel and the outer spiral pump oil channel (2-1.2) are concentric and coaxial and independent of each other.

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