Variable frequency piston compressor and refrigerator

Abstract

The present application relates to the field of refrigerator, specifically relates to a variable frequency piston compressor and refrigerator;Variable frequency piston compressor includes: crankshaft, up and down direction is arranged and can rotate around its own axis, the crankshaft has a central oil hole, the central oil hole has the oil suction port towards the lower side;Pump sleeve, arranged below the oil suction port, the pump sleeve has an oil hole that penetrates the pump sleeve up and down, the lower end of the oil hole is the oil inlet, the upper end of the oil hole is the oil outlet;The oil hole includes an oil guide section, the hole diameter of the oil guide section gradually increases from bottom to top;Vane disc, the vane disc is arranged in the oil hole, the first oil passing interval is formed between the vane disc and the inner wall surface of the oil guide section, the vane disc can float in the oil hole with lubricating oil;The rotation of the crankshaft can make the lubricating oil flow through the oil inlet, the first oil passing interval, the oil outlet and the oil suction port in turn, and then enter the central oil hole, so as to ensure that the variable frequency piston compressor keeps stable oil pumping when working at high frequency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigerators, in particular to a variable frequency piston compressor and a refrigerator. BACKGROUND

[0002] The oil discharge rate of the compressor of the refrigerator directly affects the working performance of the compressor. If the oil discharge rate of the compressor is relatively high, the oil return effect of the compressor is poor, and even impurities are discharged during work, which affects the heat exchange capacity of the evaporator and the condenser, and further reduces the heat exchange effect of the refrigerator. When the oil return effect is low and impurities are discharged, the compressor will also be excessively worn. Therefore, it is particularly important to reduce the oil discharge rate of the compressor, reduce the oil content of the system, and ensure sufficient lubrication of the compressor.

[0003] With the development of variable frequency piston compressors, the operating frequency of the piston compressor is also becoming wider. The wide operating frequency of the piston compressor causes the oil discharge to increase when the piston compressor works at high frequency, and the oil discharge rate of the piston compressor increases significantly as the temperature of the compressor rises. The lubricating oil cannot return to the oil pool in time, resulting in oil shortage wear of the pump body parts, reduced energy efficiency, and even damage. When the piston compressor operates at low frequency, a phenomenon of insufficient oil supply often occurs. Insufficient oil supply can also cause lubricated parts to be poorly lubricated and accelerate wear.

[0004] The existing piston compressor oil pump mostly uses a centrifugal oil pump and a spiral oil pump, which is installed at the bottom of the core and concentric with the crankshaft. When the crankshaft rotates, the bottom end of the oil pump sucks lubricating oil from the shell oil pool to the lubricated parts of the core. The centrifugal oil pump is mostly a conical tube, which uses centrifugal force to make the oil rise along the inner wall of the conical tube. However, the centrifugal oil pump has insufficient oil supply capacity at low frequency and excessive oil discharge rate at high frequency, which affects the core lubrication and the overall efficiency of the machine.

[0005] In the prior art, to solve the problem of insufficient oil supply at low frequency, a spiral oil pump is provided. The spiral oil pump is mostly a straight-walled circular tube with a spiral oil groove outside, which is inserted into the center hole of the crankshaft. The oil climbs along the inclined surface of the spiral groove. The low-frequency oil supply capacity is significantly improved, but the oil pumping capacity cannot be adjusted at high frequency and in hot state, and the oil pumping capacity is too high, and the oil discharge rate is also high.

[0006] There is currently no good solution to how to keep the oil pumping capacity of the variable frequency piston compressor stable when working at high frequency. SUMMARY

[0007] To ensure stable oil pumping of the variable frequency piston compressor when working at high frequency, a variable frequency piston compressor and a refrigerator are provided.

[0008] In one aspect, the variable frequency piston compressor provided by the present application comprises:

[0009] A crankshaft is arranged in the vertical direction and can rotate around its own axis, the crankshaft has a central oil hole, the central oil hole has an oil suction port facing downward;

[0010] A pump sleeve is arranged below the oil suction port, the pump sleeve has an oil supply hole penetrating through the pump sleeve in the vertical direction, the lower end of the oil supply hole is an oil inlet port, the upper end of the oil supply hole is an oil outlet port; the oil supply hole includes an oil guide section, the hole diameter of the oil guide section gradually increases from bottom to top;

[0011] A vane disc is arranged in the oil supply hole, a first oil passing interval is formed between the vane disc and the inner wall surface of the oil guide section, the vane disc can float in the oil supply hole along with the lubricating oil;

[0012] The rotation of the crankshaft can make the lubricating oil flow through the oil inlet port, the first oil passing interval, the oil outlet port, the oil suction port and then enter the central oil hole.

[0013] Preferably, the vane disc includes a plurality of vanes, a second oil passing interval is formed between adjacent two vanes in the axial direction of the vane disc.

[0014] Preferably, the vane is a flexible plate.

[0015] Preferably, the diameter of the vane disc is greater than the diameter of the oil inlet port.

[0016] Preferably, an oil pump is arranged in the central oil hole, the oil pump has a gap with the inner wall surface of the central oil hole; the outer circular surface of the oil pump is provided with a spiral rib;

[0017] In the axial direction of the oil pump, an oil path is formed between every two adjacent turns of the spiral rib, a plurality of adjacent oil paths are sequentially connected to form a spiral oil channel, and the rotation of the crankshaft can make the lubricating oil move upward along the spiral oil channel.

[0018] Preferably, a fixing rod is connected to the bottom of the oil pump, the upper end of the fixing rod is fixedly connected with the oil pump, and the lower end of the fixing rod penetrates through the oil inlet port and is fixed by a fixing member;

[0019] The vane disc is provided with a shaft hole, and the vane disc is sleeved on the fixing rod through the shaft hole.

[0020] Preferably, the lower end of the fixing rod is provided with a stop block, and the diameter of the vane disc is smaller than the diameter of the oil inlet port.

[0021] Preferably, the crankshaft is driven by a motor, the motor includes a stator; the lower end of the fixing rod is provided with a limiting hole, the fixing member is a steel wire, the steel wire penetrates through the limiting hole, and the two ends of the steel wire are fixed on the stator.

[0022] Preferably, the oil pump is provided with a cavity, and the bottom of the oil pump is provided with a bottom plate, the bottom plate is provided with a through slot, and the upper side of the bottom plate is provided with a limiting slot;

[0023] The upper end of the fixed rod is provided with a limiting block, the limiting block can pass through the through slot and rotate after passing through the through slot to make the limiting block interference fit in the limiting slot.

[0024] Preferably, the pump sleeve is fixedly connected with the crankshaft, and the oil feeding hole comprises an oil suction section arranged on the lower side of the oil guiding section, and the oil suction section is provided with an oil guiding sheet.

[0025] In another aspect, the application further provides a refrigerator comprising the variable frequency piston compressor.

[0026] The application sets the pump sleeve below the crankshaft, the oil feeding hole of the pump sleeve comprises an oil guiding section with gradually increasing hole diameter from bottom to top, and a vane disc capable of floating with the lubricating oil is arranged in the oil feeding hole, and a first oil passing interval is formed between the vane disc and the inner wall surface of the oil guiding section. When the rotating speed of the crankshaft is high, the liquid level of the lubricating oil in the oil pool is lowered, the vane disc floats downward with the lubricating oil, and the flow area of the first oil passing interval is reduced. Since the rotating speed of the crankshaft is high, the upward flow speed of the lubricating oil is high, and at the same time, the flow area of the first oil passing interval is reduced, so that the total amount of the lubricating oil flowing upward through the first oil passing interval is kept stable. Conversely, when the rotating speed of the crankshaft is low, the liquid level of the lubricating oil in the oil pool is high, the vane disc floats upward with the lubricating oil, and the flow area of the first oil passing interval is increased. Since the rotating speed of the crankshaft is low, the upward flow speed of the lubricating oil is low, and at the same time, the flow area of the first oil passing interval is increased, so that the total amount of the lubricating oil flowing upward through the first oil passing interval is kept stable. The application effectively reduces the phenomenon that too much oil is fed and the oil discharge rate is increased when the rotating speed of the crankshaft is too high (the compressor works at high frequency), and the phenomenon that too little oil is fed and the lubrication is insufficient when the rotating speed of the crankshaft is too low (the compressor works at low frequency). The application further ensures the stable working of the variable frequency piston compressor and improves the service life of the variable frequency piston compressor. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the mutual relationship among the crankshaft, the oil pump, the pump sleeve and the steel wire of the embodiment of the application;

[0028] Figure 2 It is a schematic diagram of the mutual relationship among the oil pump, the pump sleeve and the steel wire of the embodiment of the application;

[0029] Figure 3 It is a sectional view of the oil pump, the pump sleeve and the steel wire of the embodiment of the application;

[0030] Figure 4 It is an appearance view of the oil pump of the embodiment of the application;

[0031] Figure 5Figure 2 is a sectional view of the oil pump according to an embodiment of the present application;

[0032] Figure 6 Figure 3 is a schematic view of the relationship between the fixed rod and the vane disc according to an embodiment of the present application;

[0033] Figure 7 Figure 4 is a schematic view of the vane disc structure according to an embodiment of the present application;

[0034] Figure 8 Figure 5 is a schematic view of the pump sleeve structure according to an embodiment of the present application.

[0035] The reference signs are as follows:

[0036] 1, crankshaft; 101, oil feeding hole; 2, central oil hole; 3, pump sleeve; 301, oil inlet; 302, oil outlet; 303, oil feeding hole; 304, oil guide sheet; 4, vane disc; 401, vane; 402, shaft hole; 403, first oil passing interval; 404, second oil passing interval; 5, oil pump; 501, helical rib; 502, through groove; 503, limiting groove; 504, helical oil channel; 6, fixed rod; 601, limiting hole; 602, limiting block; 7, steel wire. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0038] The terms used in the embodiments of the present application are merely for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two, but does not exclude the case of including at least one.

[0039] It should be understood that the term "and / or" as used herein merely describes an association relationship of associated objects, and means that three relationships can exist, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the text generally represents that the front and rear associated objects have an "or" relationship; "first", "second" in the text are only used to distinguish different technical features, and do not have a sequence; "upper", "lower", "front" and "rear" in the text are only used to more conveniently illustrate the positional relationship of the technical features, and have certain significance only in combination with the actual use situation or the specific position description in the preceding text, and are not absolute positional relationships.

[0040] It should also be noted that the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the goods or systems comprising a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such goods or systems. Without more limitations, the element defined by the sentence "comprises a" does not exclude the existence of another identical element in the goods or system comprising the element.

[0041] The present application relates to the field of refrigerators, in particular to a variable frequency piston compressor and a refrigerator; the oil discharge rate of the compressor of the refrigerator directly affects the working performance of the compressor, if the oil discharge rate of the compressor is relatively high, the oil return effect of the compressor is poor, and even impurities are discharged during work, which affects the heat exchange capacity of the evaporator and the condenser, and further reduces the heat exchange effect of the refrigerator; when the oil return effect is low, impurities are discharged, and the compressor will also be overworn. Therefore, it is particularly important to reduce the oil discharge rate of the compressor, reduce the oil content of the system, and ensure the full lubrication of the compressor.

[0042] With the development of variable frequency compressors, the operating frequency of piston compressors is also becoming wider; the wide operating frequency of piston compressors makes the oil discharge amount increase when the piston compressor works at high frequency, and the oil discharge rate of the piston compressor increases significantly as the temperature of the compressor rises, so that the lubricating oil cannot return to the oil pool in time, causing the pump body parts to be worn out due to lack of oil, and the energy efficiency to be reduced or even damaged; when the piston compressor operates at low frequency, the phenomenon of insufficient oil supply often occurs, and insufficient oil supply will also cause the lubricating parts to be unable to be well lubricated and accelerate wear.

[0043] The existing piston compressor oil pump mostly adopts a centrifugal oil pump and a spiral oil pump, which is installed at the bottom of the core and concentric with the crankshaft. When the crankshaft rotates, the bottom end of the oil pump sucks lubricating oil from the shell oil pool to the lubrication position of the core; the centrifugal oil pump is mostly a conical tube, which uses centrifugal force to make the oil rise along the inner wall of the conical tube, but the centrifugal oil pump has insufficient oil supply capacity at low frequency and excessive oil discharge rate at high frequency, which affects the core lubrication and the overall efficiency of the machine.

[0044] In the prior art, to solve the problem of insufficient oil supply at low frequency, a spiral oil pump is provided, which is a straight-walled circular tube with a spiral oil groove outside and is inserted into the center hole of the crankshaft. The oil climbs along the inclined surface of the spiral groove, and the low-frequency oil supply capacity is significantly improved. However, the pump oil volume cannot be adjusted at high frequency and in hot state, and the pump oil volume is relatively high, and the oil discharge rate is also relatively high.

[0045] To ensure stable oil pumping of the variable frequency piston compressor at high frequency, a variable frequency piston compressor and a refrigerator are provided.

[0046] A variable frequency piston compressor, as shown in Figures 1-8 The variable frequency piston compressor comprises a crankshaft 1, which is arranged in the up-down direction and can rotate around its own axis. The crankshaft 1 has a center oil hole 2, and the center oil hole 2 has an oil suction port facing downward. A pump sleeve 3 is arranged below the oil suction port. The pump sleeve 3 has an oil inlet hole 303 that penetrates the pump sleeve 3 in the up-down direction. The lower end of the oil inlet hole 303 is an oil inlet port 301, and the upper end of the oil inlet hole 303 is an oil outlet port 302. The oil inlet hole 303 comprises a guide oil section, and the hole diameter of the guide oil section gradually increases from bottom to top. A vane disc 4 is arranged in the oil inlet hole 303. The vane disc 4 and the inner wall surface of the guide oil section form a first oil passing interval 403. The vane disc 4 can float in the oil inlet hole 303 with the lubricating oil. The rotation of the crankshaft 1 can make the lubricating oil flow through the oil inlet port 301, the first oil passing interval 403, the oil outlet port 302, and the oil suction port in sequence and then enter the center oil hole 2.

[0047] First of all, it should be pointed out that "up" and "down" in the claims and the specification are relative spatial positions in the actual working state, and are positional limitations for convenience of description. "Multiple" includes "two".

[0048] The rotation of the crankshaft 1 drives the lubricating oil to enter the pump sleeve 3 through the oil inlet 301, to be discharged from the oil outlet 302 after passing through the first oil passing interval 403, and to enter the central oil hole 2 through the oil suction port. The lubricating oil drives the vane disc 4 to float in the oil supply hole 303. When the rotation speed of the crankshaft 1 is high, the operating frequency of the compressor is high, the rate and total amount of the lubricating oil entering the central oil hole 2 are high, the liquid level in the oil pool is lowered, and the vane disc 4 is floated downward with the lubricating oil. Since the diameter of the oil guide section gradually increases from bottom to top, that is, the diameter of the oil guide section gradually decreases from top to bottom, the interval between the vane disc 4 and the inner wall surface of the oil guide section becomes small, that is, the flow area of the first oil passing interval 403 is reduced, thereby reducing the oil supply amount and the oil discharge rate of the compressor during high-frequency operation. When the rotation speed of the crankshaft 1 is low, the operating frequency of the compressor is low, the rate and total amount of the lubricating oil entering the central oil hole 2 are low, the liquid level in the oil pool is raised, and the vane disc 4 is floated upward with the lubricating oil. Since the diameter of the oil guide section gradually increases from bottom to top, that is, the flow area of the first oil passing interval 403 is increased, the flow area of the lubricating oil flowing upward is increased, and the oil supply amount of the compressor during low-frequency operation is increased, thereby avoiding insufficient oil pumping to reduce wear and prolong the service life. The floating of the vane disc 4 not only ensures the stability of the oil supply of the compressor, but also reduces the operating noise of the compressor and improves the smooth operation of the compressor. To further improve the smoothness of the lubricating oil flow, the axis of the oil supply hole 303 and the axis of the central oil hole 2 can be coaxial.

[0049] Further, the inner wall surface of the oil guide section can be designed as a conical surface or other curved surface, which is beneficial to the stable cooperation between the vane disc 4 and the inner wall surface of the oil guide section.

[0050] Preferably, as shown in Figures 6-7 The vane disc 4 includes a plurality of vanes 401, and a second oil passing interval 404 is formed between adjacent two vanes 401 in the axial direction of the vane disc 4.

[0051] The second oil passing interval 404 is formed between adjacent two vanes 401, which can reduce the flow area of the first oil passing interval 403 under the premise of ensuring the same oil passing amount, thereby reducing the size of the pump sleeve 3 and reducing the cost.

[0052] Preferably, the vane 401 is a flexible plate.

[0053] When the vane disc 4 floats downward and contacts with the inner wall surface of the oil guiding section, the lubricating oil can flow through the second oil passing interval 404 between the blades 401; the lubricating oil level is lowered further, the outer edge of the blade 401 is supported by the inner wall surface of the oil guiding section, under the action of gravity, the inner edge of the blade 401, that is, the middle part of the vane disc 4 bends downward, and then the second oil passing interval 404 between the adjacent two blades 401 gradually becomes smaller; due to the high rotating speed of the crankshaft 1, the upward flowing speed of the lubricating oil increases, and the flow area of the second oil passing interval 404 decreases, which effectively ensures the stability of the oil supply; through the above arrangement, the rotating speed of the crankshaft 1 can still maintain stable oil supply under the condition of being relatively high, and accordingly the high frequency range of the variable frequency compressor is improved, and the applicability of the compressor is increased.

[0054] Preferably, the diameter of the vane disc 4 is greater than the diameter of the oil inlet 301.

[0055] When the rotating speed of the crankshaft 1 is high, the liquid level in the oil pool is low, when the liquid level is lower than the oil inlet 301, by making the diameter of the vane disc 4 greater than the diameter of the oil inlet 301, the vane disc 4 is effectively prevented from sliding downward from the pump sleeve 3 through the oil inlet 301, and the stability of the vane disc 4 in operation is ensured.

[0056] Preferably, as shown in Figures 1-3 the center oil hole 2 is provided with an oil pump 5, and the oil pump 5 has a gap with the inner wall surface of the center oil hole 2; the outer circular surface of the oil pump 5 is provided with helical ribs 501; in the axial direction of the oil pump 5, the helical ribs 501 form oil paths between every two adjacent turns, and the adjacent oil paths are sequentially connected to form a spiral oil channel 504, and the rotating of the crankshaft 1 can make the lubricating oil move upward along the spiral oil channel 504.

[0057] The gap between the oil pump 5 and the inner wall surface of the center oil hole 2 can prevent the oil pump 5 from being disturbed when the crankshaft 1 rotates; the rotating of the crankshaft 1 makes the lubricating oil enter the center oil hole 2, and the lubricating oil moves upward under the action of the mutual force in the lubricating oil while doing circular motion along the inner wall surface of the center oil hole 2 under the action of centrifugal force; by arranging the helical ribs 501 on the outer circular surface of the oil pump 5, the lubricating oil flows upward along the spiral oil channel 504 under the resistance of the helical ribs 501 when doing circular motion, which is beneficial to improve the upward flowing speed and amount of the lubricating oil when the rotating speed of the crankshaft 1 is low, and then the stability of the oil supply of the variable frequency compressor is ensured.

[0058] Preferably, as shown in Figures 3-6 the bottom of the oil pump 5 is connected with a fixing rod 6, the upper end of the fixing rod 6 is fixedly connected with the oil pump 5, and the lower end of the fixing rod 6 passes through the oil inlet 301 and is fixed by a fixing piece; the vane disc 4 is provided with a shaft hole 402, and the vane disc 4 is sleeved on the fixing rod 6 through the shaft hole 402.

[0059] The oil pump 5 is fixed by the fixing rod 6 to avoid rotation of the oil pump 5; the vane disc 4 is sleeved on the fixing rod 6 through the shaft hole 402 to enable the vane disc 4 to only float in the up-down direction, which is beneficial to uniformity of the interval between the vane disc 4 and the inner wall surface of the oil guide section and to stable upward flow of the lubricating oil; the vane disc 4 is limited by the fixing rod 6 for fixing the oil pump 5, and it is not necessary to limit the vane disc 4 by other structures, which is beneficial to reduction of the space occupation in the pump sleeve 3 and improvement of the flow smoothness of the lubricating oil.

[0060] Preferably, the lower end of the fixing rod 6 is provided with a stop block, and the diameter of the vane disc 4 is smaller than the diameter of the oil inlet 301.

[0061] The reduced diameter of the vane disc 4 is beneficial to cost reduction; since the lower end of the fixing rod 6 is provided with the stop block and the diameter of the vane disc 4 is smaller than the diameter of the oil inlet 301, the vane disc 4 cannot slide downward to separate from the pump sleeve 3, and the stability of the vane disc 4 in operation is ensured.

[0062] Preferably, as shown in Figure 3 , the crankshaft 1 is driven by a motor, and the motor comprises a stator; the lower end of the fixing rod 6 is provided with a limiting hole 601, and the fixing member is a steel wire 7, which passes through the limiting hole 601 and is fixed at both ends to the stator.

[0063] The fixing rod 6 is fixed by the steel wire 7, and the oil pump 5 is further fixed; the steel wire 7 has low cost and simple manufacturing, which is beneficial to improvement of production efficiency and reduction of production cost. Other ways, such as fixing the lower end of the fixing rod 6 in the oil pool by bolts, can also be adopted.

[0064] Preferably, as shown in Figures 4-5 , the oil pump 5 is provided with a cavity, and the bottom of the oil pump 5 has a bottom plate, the bottom plate is provided with a through slot 502, and the upper side of the bottom plate is provided with a limiting groove 503; the upper end of the fixing rod 6 is provided with a limiting block 602, which can pass through the through slot 502 and can rotate after passing through the through slot 502 to make the limiting block 602 interference fit in the limiting groove 503.

[0065] The oil pump 5 and the fixing rod 6 are fixed together by the above structure, which is simple and ingenious, and is beneficial to improvement of production efficiency and reduction of cost.

[0066] Preferably, the pump sleeve 3 is fixedly connected with the crankshaft 1, and the oil inlet hole 303 comprises an oil suction section arranged on the lower side of the oil guide section, as shown in Figure 8 , the oil suction section is provided with an oil guide vane 304.

[0067] The crankshaft 1 drives the pump sleeve 3 to rotate, the pump sleeve 3 drives the oil guide vane 304 to rotate, and the oil guide vane 304 rotates to produce a centrifugal boosting effect on the lubricating oil, which is beneficial to improvement of the oil supply amount of the crankshaft 1 at low speed and to guarantee of the lubricating effect of the compressor at low frequency.

[0068] The application also provides a refrigerator with the above variable frequency piston compressor, which has a wide temperature regulating range, low noise during operation and long service life.

[0069] The above merely describes preferred embodiments of the present application, but should not be used to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application, but should not be used to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A variable frequency piston compressor, characterized by, The application relates to a crankshaft (1) provided with a central oil hole (2) and a pump sleeve (3). The crankshaft (1) is arranged in the vertical direction and can rotate around its own axis. The crankshaft (1) is provided with a central oil hole (2) having an oil suction port facing downwards. The pump sleeve (3) is arranged below the oil suction port. The pump sleeve (3) is provided with an upper oil hole (303) penetrating the pump sleeve (3) in the vertical direction.

2. The variable frequency piston compressor of claim 1, wherein, The upper end of the upper oil hole (303) is an oil outlet port (302).

3. The variable frequency piston compressor of claim 2, wherein, The lower end of the upper oil hole (303) is an oil inlet port (301).

4. The variable frequency piston compressor of claim 1, wherein, The upper oil hole (303) comprises an oil guide section.

5. The variable frequency piston compressor of claim 1, wherein, The diameter of the oil guide section gradually increases from bottom to top. A vane disc (4) is arranged in the upper oil hole (303).

6. The variable frequency piston compressor of claim 5, wherein, The vane disc (4) is capable of floating in the upper oil hole (303) along with lubricating oil. The rotation of the crankshaft (1) can make the lubricating oil flow through the oil inlet port (301), the first oil passing interval (403), the oil outlet port (302) and the oil suction port in sequence and then enter the central oil hole (2).

7. The variable frequency piston compressor of claim 6, wherein, The vane disc (4) comprises a plurality of blades (401).

8. The variable frequency piston compressor of claim 6, wherein, In the axial direction of the vane disc (4), a second oil passing interval (404) is formed between two adjacent blades (401).

9. The variable frequency piston compressor of claim 6, wherein, The blade (401) is a flexible plate. The diameter of the vane disc (4) is greater than the diameter of the oil inlet port (301). An oil pump (5) is arranged in the central oil hole (2). The oil pump (5) is provided with a helical rib (501) on its outer circular surface. In the axial direction of the oil pump (5), an oil path is formed between every two adjacent turns of the helical rib (501). A plurality of adjacent oil paths are connected in sequence to form a helical oil channel (504). The rotation of the crankshaft (1) can make the lubricating oil move upwards along the helical oil channel (504). The bottom of the oil pump (5) is connected with a fixing rod (6). The upper end of the fixing rod (6) is fixedly connected with the oil pump (5). The lower end of the fixing rod (6) penetrates the oil inlet port (301) and is fixed by a fixing member. The vane disc (4) is arranged on the fixing rod (6) through an axle hole (402). The diameter of the vane disc (4) is less than the diameter of the oil inlet port (301). The crankshaft (1) is driven by a motor. The lower end of the fixing rod (6) is provided with a limiting hole (601). The fixing member is a steel wire (7). The steel wire (7) penetrates the limiting hole (601). The two ends of the steel wire (7) are fixed on the stator of the motor. The oil pump (5) is provided with a cavity. The bottom of the oil pump (5) is provided with a bottom plate. The bottom plate is provided with a limiting groove (503) on its upper side. The upper end of the fixed rod (6) is provided with a limiting block (602), the limiting block (602) can pass through the through slot (502) and can rotate after passing through the through slot (502) to make the limiting block (602) be interference clamped in the limiting slot (503).

10. The variable frequency piston compressor of claim 1, wherein, The pump sleeve (3) is fixedly connected with the crankshaft (1), the oil inlet hole (303) comprises an oil suction section arranged at the lower side of the oil guide section, and the oil suction section is provided with an oil guide vane (304).

11. A refrigerator characterized by comprising: A variable frequency piston compressor comprising the compressor of any one of claims 1-10.

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