Lubricating structure and refrigerator compressor

Abstract

The utility model discloses a lubricating structure and a refrigerator compressor, and belongs to the technical field of refrigerator compressors. The lubricating structure is applied to the refrigerator compressor, when a crankshaft rotates, bottom lubricating oil flows into a crankshaft oil way under the action of centrifugal force, then the lubricating oil enters the eccentric annular oil groove in the eccentric position of the crankshaft to cool and lubricate crankshaft eccentricity, and then the lubricating oil enters the connecting rod center oil groove; through rotation of the connecting rod, the lubricating oil enters the annular oil groove of the connecting rod and then flows into the cylinder hole through the oil discharging groove; when lubricating oil enters the cylinder hole, the piston and the piston pin reciprocate in the cylinder hole, part of the lubricating oil enters the hollow groove in the piston pin in the reciprocating process, and then the lubricating oil reaches the head of the whole cylinder. In the process, oil mist and abnormal noise caused when lubricating oil splashes to impact parts are avoided, and the lubricating performance of moving parts in the compressor is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to refrigerator compressor technical field, concretely is a kind of lubricating structure and refrigerator compressor. BACKGROUND

[0002] Lubricating structure is the key structure in the lubricating system of refrigerator compressor, for the repeated movement of piston in cylinder hole and crankshaft, connecting rod etc. Good lubricating effect is played, and the temperature of lubricating oil is lower than the temperature of cylinder head in operation, so it can reduce the temperature of cylinder head while lubricating, more conducive to the compression process of piston in cylinder hole, for the great effect of the refrigeration of compressor, therefore, good lubricating mode can effectively increase the lubricating performance of moving part, better control the temperature rise inside movement.

[0003] The existing lubricating mode is that crankshaft rotation drives crankshaft bottom thread-shaped oil suction pipe core to suck oil in the bottom of shell, reaches eccentric position by oil way on crankshaft, and the oil is splashed by the rotation of crankshaft to impact piston, cylinder seat, connecting rod, shell and other parts for lubrication. The existing lubricating mode can cause oil splashing in the shell, impact the shell to produce oil mist from the suction side, reduce the amount of lubricating oil in the shell, reduce the lubricating performance of moving part and increase wear, and further reduce efficiency. At the same time, through the splashing lubricating mode, oil impact on the internal parts of movement, can cause abnormal noise and vibration, affect the effect of compressor in the box. Moreover, the gap between piston and cylinder hole is very small, about 7 microns, and it is difficult for oil to fully lubricate the cylinder hole and piston.

[0004] Therefore, a lubricating structure and refrigerator compressor are needed to solve the above technical problems in the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of lubricating structure and refrigerator compressor to solve the problem that oil splashes and impacts parts to produce oil mist and abnormal noise when refrigerator compressor is lubricated, improve the lubricating performance of moving part inside compressor.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of lubricating structure, including cylinder seat, crankshaft and connecting rod are arranged on cylinder seat;

[0008] Oil way is arranged on the crankshaft;

[0009] Center oil groove is arranged on the connecting rod, one end of center oil groove is communicated with connecting rod big hole, and the other end is communicated with connecting rod small hole;

[0010] Eccentric annular oil groove is arranged at eccentric position of crankshaft, and eccentric annular oil groove is communicated with oil way of crankshaft and center oil groove of connecting rod;

[0011] The connecting rod small hole is provided with a connecting rod annular oil groove, and the connecting rod annular oil groove is communicated with the center oil groove of the connecting rod;

[0012] The connecting rod small hole is provided with an oil discharging groove, and the oil discharging groove is communicated with the connecting rod annular oil groove;

[0013] The connecting rod small hole is provided with a piston pin, and a hollow slot for oil flow is formed in the piston pin.

[0014] Preferably, the width d1 of the eccentric annular oil groove is less than 30% of the width D1 of the connecting rod large hole.

[0015] Preferably, the width d2 of the connecting rod annular oil groove is less than 20% of the width D2 of the connecting rod small hole.

[0016] Preferably, the width d3 of the oil discharging groove is less than 50% of the radius of the connecting rod small hole.

[0017] Preferably, the width of the connecting rod center oil groove is less than the width of the eccentric annular oil groove.

[0018] Preferably, the width of the hollow slot in the piston pin is 3mm.

[0019] Preferably, notches are arranged on both sides of the piston for reducing the contact area between the outer surface of the piston and the inner surface of the cylinder hole.

[0020] Preferably, the width of the notch is 60% of the diameter of the piston, and the depth of the notch is 20% of the diameter of the piston.

[0021] A refrigerator compressor is provided with the lubricating structure.

[0022] Compared with the prior art, the lubricating structure has the following beneficial effects:

[0023] As described above, the lubricating structure is applied to the refrigerator compressor, and the annular oil groove and the oil discharging groove are designed, the oil splash type lubrication mode of the existing lubricating structure is changed, the oil splash is avoided, the oil mist caused by the oil splash and impact on the parts is effectively solved, the oil mist is avoided from being sucked into the air intake muffler during air intake, the problem of insufficient reduction of the cylinder head temperature caused by the reduction of the lubricating oil amount is avoided, and the problems of poor exhaust caused by the oil mist remaining in the internal exhaust muffler part and the influence on the refrigeration effect are solved.

[0024] The lubricating structure can reduce the loss of lubricating oil, reduce the wear of the compressor, solve the problem of insufficient lubrication of the moving parts at low rotation speed, avoid abnormal noise and vibration caused by the impact of the oil on the parts, increase the refrigeration effect, and improve the performance of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the embodiments will be briefly introduced below.

[0026] Figure 1 This is a schematic diagram of a lubrication structure in the prior art;

[0027] Figure 2 This is a schematic diagram of the lubrication structure in this embodiment;

[0028] Figure 3 This is a schematic diagram of the crankshaft structure in the prior art;

[0029] Figure 4 This is a schematic diagram of the crankshaft structure in this embodiment;

[0030] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0031] Figure 6 This is a schematic diagram of the linkage structure in the prior art;

[0032] Figure 7 This is a schematic diagram of the connecting rod in this embodiment;

[0033] Figure 8 for Figure 7 A magnified view of a section at point B in the middle;

[0034] Figure 9 This is a schematic diagram of the piston pin structure in the prior art;

[0035] Figure 10 This is a schematic diagram of the piston pin structure in this embodiment;

[0036] Figure 11 This is a schematic diagram of the piston structure in the prior art;

[0037] Figure 12 This is a schematic diagram of the piston structure in this embodiment.

[0038] In the diagram: 1. Cylinder seat; 2. Crankshaft; 3. Connecting rod; 4. Piston; 5. Piston pin; 6. Eccentric annular oil groove; 7. Connecting rod bore; 8. Connecting rod annular oil groove; 9. Unloading groove; 10. Central oil groove; 11. Oil passage; 12. Hollow groove; 13. Cylinder bore. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0040] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0042] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Example

[0045] like Figures 1 to 12 As shown in the figure, this embodiment describes a lubrication structure applied to a refrigerator compressor. The lubrication structure includes a cylinder seat 1, on which a crankshaft 2 and a connecting rod 3 are disposed. One end of the connecting rod 3 is connected to the crankshaft 2, and the other end of the connecting rod 3 is connected to a piston 4. The piston 4 is engaged with a cylinder bore 13.

[0046] In this embodiment, the crankshaft 2 is provided with an oil passage 11. When the crankshaft 2 rotates, the bottom lubricating oil is applied through the oil passage 11 under the action of centrifugal force.

[0047] In this embodiment, the connecting rod 3 is provided with a central oil groove 10, one end of which is connected to the connecting rod large hole 7, and the other end is connected to the connecting rod small hole. An eccentric annular oil groove 6 is formed at the eccentric position of the crankshaft 2, and the eccentric annular oil groove 6 connects the oil passage 11 of the crankshaft 2 and the central oil groove 10 of the connecting rod 3.

[0048] When the crankshaft 2 rotates, the lubricating oil in the oil passage 11 enters the eccentric annular oil groove 6 at the eccentric position of the crankshaft 2, for cooling and lubricating the eccentric position of the crankshaft.

[0049] In this embodiment, the width d1 of the eccentric annular oil groove 6 is less than 30% of the width D1 of the connecting rod large hole 7; the depth of the eccentric annular oil groove 6 is 0.5 mm.

[0050] The width of the central oil groove 10 is less than the width d1 of the eccentric annular oil groove 6.

[0051] In this embodiment, the connecting rod annular oil groove 8 is arranged on the connecting rod small hole, and the connecting rod annular oil groove 8 is communicated with the central oil groove 10. In addition, the oil discharging groove 9 is arranged below the connecting rod annular oil groove 8 in an open loop mode, and the oil discharging groove 9 is communicated with the connecting rod annular oil groove 8.

[0052] When the crankshaft 2 rotates, the lubricating oil flows into the central oil groove 10 of the connecting rod 3 through the eccentric annular oil groove 6. Through the rotation of the connecting rod 3, the lubricating oil enters the connecting rod annular oil groove 8 at the connecting rod small hole from the central oil groove 10 of the connecting rod 3, and then directly enters the cylinder bore 13 through the oil discharging groove 9 to lubricate the cylinder bore 13.

[0053] In this embodiment, the width d2 of the connecting rod annular oil groove 8 is less than 20% of the width D2 of the connecting rod small hole; the depth of the connecting rod annular oil groove 8 is 0.55 mm.

[0054] The width d3 of the oil discharging groove 9 is less than 50% of the radius of the connecting rod small hole.

[0055] In this embodiment, the piston pin 5 is arranged in the connecting rod small hole, and the hollow groove 12 is arranged in the piston pin 5. When the lubricating oil is lubricated, the circulation of the lubricating oil is more favorable. In order to increase the lubrication degree of the lubricating oil and increase the lubrication space of the piston 4 in the cylinder bore 13, rectangular notches are arranged on both sides of the piston 4. The notches can reduce the matching area of the outer surface of the piston 4 and the inner surface of the cylinder bore 13, and reduce the relative friction loss. The width of the notches is 60% of the diameter of the piston 4, and the depth of the notches is 20% of the diameter of the piston 4.

[0056] In this embodiment, the width of the hollow groove 12 in the piston pin 5 is 3 mm.

[0057] When the piston 4 and the piston pin 5 reciprocate in the cylinder bore 13, part of the lubricating oil flows into the hollow groove 12 in the piston pin 5, and then the lubricating oil reaches the entire cylinder head. At the same time, when the piston 4 reciprocates, the rectangular notches on both sides of the piston 4 increase the lubricating oil in the cylinder bore 13, increase the lubrication and cooling effect, and thus improve the performance of the refrigerator compressor.

[0058] The connecting oil groove is designed for the small hole of the connecting rod and the eccentric position of the crankshaft 2, the splash type lubrication mode of the existing lubricating structure is changed, the splashing of the oil is avoided, the oil mist caused by the splashing of the oil to the parts is effectively solved, the problem that the oil mist is sucked into the air intake muffler during air intake, the insufficient problem of the temperature reduction of the cylinder head caused by the reduction of the amount of lubricating oil is avoided, the problem that the poor exhaust caused by the retention of the oil mist in the internal exhaust muffler part is solved, and the problem that the refrigeration effect is affected is solved.

[0059] The lubricating structure of the embodiment can reduce the wear of the compressor and the problem of insufficient lubrication of the moving parts at low rotation speed, thereby increasing the refrigeration effect and reducing the energy consumption, and can also avoid the abnormal noise and vibration caused by the splashing of the oil, and the effect of the compressor in the box is improved.

[0060] The flow path of the lubricating oil in the lubricating structure described in the embodiment is as follows:

[0061] In use, the rotation of the crankshaft 2 causes the bottom lubricating oil to flow into the oil channel 11 of the crankshaft 2 under the action of centrifugal force, and then the lubricating oil enters the eccentric annular oil groove 6 at the eccentric position of the crankshaft 2, is used for cooling and lubricating the eccentric position of the crankshaft, and then enters the central oil groove 10 of the connecting rod 3; the rotation of the connecting rod 3 causes the lubricating oil to enter the annular oil groove 8 of the connecting rod 3, and then flows into the inside of the cylinder hole 13 through the oil discharge groove 9; when the lubricating oil enters the inside of the cylinder hole 13, the piston 4 and the piston pin 5 reciprocate in the inside of the cylinder hole 13, part of the lubricating oil enters the hollow groove 12 in the inside of the piston pin 5 in the reciprocating process, and the lubricating oil further reaches the entire cylinder head.

[0062] The embodiment also describes a refrigerator compressor, and the refrigerator compressor is provided with the lubricating structure.

[0063] The embodiments of the utility model are used to illustrate the technical scheme of the utility model and are not limited, and for those skilled in the art, it can be understood that the embodiments can be changed, modified, replaced and changed in various ways without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and its equivalents.

Claims

1. A lubricating structure comprising a cylinder block, a crankshaft and a connecting rod arranged on the cylinder block, characterized in that: an oil passage is arranged on the crankshaft; a central oil groove is arranged on the connecting rod, one end of the central oil groove being communicated with a large hole of the connecting rod and the other end being communicated with a small hole of the connecting rod; an eccentric annular oil groove is arranged at an eccentric position of the crankshaft, the eccentric annular oil groove being communicated with the oil passage of the crankshaft and the central oil groove of the connecting rod; an annular oil groove is arranged on the small hole of the connecting rod, the annular oil groove being communicated with the central oil groove of the connecting rod; an oil discharging groove is arranged on the small hole of the connecting rod, the oil discharging groove being communicated with the annular oil groove of the connecting rod; a piston pin is arranged in the small hole of the connecting rod, and a hollow slot for oil flow is arranged in the piston pin. The width d1 of the eccentric annular oil groove is less than 30% of the width D1 of the large hole of the connecting rod. The width d2 of the annular oil groove of the connecting rod is less than 20% of the width D2 of the small hole of the connecting rod. The width d3 of the oil discharging groove is less than 50% of the radius of the small hole of the connecting rod. The width of the central oil groove of the connecting rod is less than the width of the eccentric annular oil groove. The width of the hollow slot in the piston pin is 3 mm. Notches are arranged on both sides of the piston for reducing the contact area between the outer surface of the piston and the inner surface of the cylinder hole.

2. A lubricating structure according to claim 1, characterized in that: The width of the notches is 60% of the diameter of the piston, and the depth of the notches is 20% of the diameter of the piston.

3. A lubricating structure according to claim 1, wherein: The refrigerator compressor is provided with the lubricating structure according to any one of claims 1 to 7.

4. A lubricating structure according to claim 1, wherein: ​ 5. A lubricating structure according to claim 1, wherein: ​ 6. A lubricating structure according to claim 1, wherein: ​ 7. A lubricating structure according to claim 1, wherein: ​ 8. A lubricating arrangement according to claim 7, wherein: ​ 9. A refrigerator compressor characterized by: ​

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