Screw oil pumping device for compressor and compressor

Abstract

The utility model belongs to the technical field of refrigeration compressors, and particularly discloses a screw oil pumping device for a compressor and the compressor. The spiral oil pumping device for the compressor comprises a crankshaft, an oil suction pipe, an oil suction pipe core, a protruding part and a suspension spring. The spiral oil pumping device for the compressor is applied to the compressor, the protruding part is arranged at the lower end of the oil suction pipe core, and a cross groove does not need to be formed in the bottom of the oil suction pipe core, so that the wall thickness of the oil suction pipe core is uniform, a gap between the oil suction pipe and the oil suction pipe core is uniform, a small gap can be kept, and the high oil feeding amount is achieved; the abrasion degree between the two is low in the operation process, and abnormal noise is reduced; the suspension spring penetrates into the assembling groove, the outer wall of the circumferential side of the suspension spring abuts against the lower end of the arc-shaped protrusion, the suspension spring and the arc-shaped protrusion are in point contact, and in the process that the crankshaft rotates at a high speed to drive oil to ascend to impact the oil suction pipe core, abnormal noise is not prone to being generated between the oil suction pipe core and the suspension spring.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration compressor technology, and relates to a spiral pump oil device for compressors and a compressor. Background Technology

[0002] The oil pump plays a crucial role in the compressor. It draws lubricating oil from the oil sump at the bottom of the casing and delivers it to various critical parts of the compressor, providing lubrication and cooling, reducing mechanical wear, preventing overheating, and ensuring smooth compressor operation. Current oil pump devices feature a suspension spring attached to the motor frame. The suspension spring bends upwards in the middle to form an inverted U-shaped rib, and the bottom of the suction pipe core has a cross-shaped groove, which mates with the inverted U-shaped rib. During compressor operation, the motor rotor drives the crankshaft and suction pipe to rotate synchronously, while the suspension spring and suction pipe core remain stationary relative to the motor stator. The oil pumping is achieved through the relative rotation of the suction pipe and suction pipe core. Ideally, the gap between the suction pipe and suction pipe core should be maintained between 0.02-0.04 mm. An excessively large gap reduces the oil delivery rate, while insufficient oil delivery leads to severe wear on moving parts of the compressor, increased compressor power, and a decreased COP. Conversely, an excessively small gap causes contact between the suction pipe core and suction pipe, resulting in friction during pipe rotation and abnormal noise. The oil suction tube core is a cast-molded part with a cross-shaped groove at its bottom. This can easily lead to uneven wall thickness, resulting in uneven gaps between the oil suction tube and the core. This causes wear between the suction tube and the core, generating abnormal noise. Wear between the suction tube and core can also allow impurities to enter the oil. These impurities can then follow the oil into the cylinder bore, piston, and other mating gaps, causing abnormal wear or jamming of moving parts and preventing the compressor from functioning properly. The inverted U-shaped rib of the suspension spring engages with the cross-shaped groove at the bottom of the oil suction tube core. Since the suspension spring and the core are in surface-to-surface contact, the high-speed rotation of the crankshaft causing the oil to rise can impact the oil suction tube core, causing it to move up, down, left, and right. This can easily generate abnormal noise between the core and the suspension spring. In addition, the suspension spring adopts an inverted U-shaped rib structure design in the middle. The suspension spring is formed by bending stainless steel wire. When the designed angle is small, it is difficult to form. The inverted U-shaped rib deviates from the original design position during the forming process. When assembling the compressor, it is difficult to put the inverted U-shaped rib of the suspension spring into the cross groove at the bottom of the oil suction pipe core, which affects the production and assembly efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a spiral pump oil device and compressor for compressors, which reduces wear and abnormal noise while achieving a high oil delivery rate.

[0004] To achieve the above objectives, this utility model adopts the following technical solution:

[0005] A compressor screw pump oil device, comprising:

[0006] The crankshaft has an oil port at its lower end and an oil passage that communicates with the oil port.

[0007] An oil suction pipe, the upper end of which is fitted with the assembly oil port;

[0008] An oil suction tube core is located inside the oil suction tube, with a gap between the oil suction tube core and the oil suction tube. An oil groove is provided on the outer circumferential side of the oil suction tube core, and the oil groove is spirally arranged along the axial direction of the oil suction tube core.

[0009] A protrusion is provided at the lower end of the oil suction tube core. An assembly groove is provided on the protrusion, which penetrates the opposite side of the protrusion. An arc-shaped protrusion is provided on the upper end surface inside the assembly groove.

[0010] A suspension spring is inserted into the interior of the mounting groove, and the outer circumferential wall of the suspension spring abuts against the lower end of the arc-shaped protrusion.

[0011] Furthermore, the opening of the assembly groove is located on the lower end face of the protrusion.

[0012] Furthermore, the opening of the assembly groove is located on the side of the protrusion.

[0013] Furthermore, the arc-shaped protrusion is configured as a semi-cylinder, and the outer wall of the circumferential side of the suspension spring intersects and is tangent to the outer wall of the semi-cylinder.

[0014] Furthermore, the oil suction tube core has a frustum-shaped structure.

[0015] Furthermore, the outer diameter of the upper end of the oil suction tube is 0.02 mm shorter than the outer diameter of the lower end of the oil suction tube.

[0016] Furthermore, the helix angle of the oil tank is 23°.

[0017] Furthermore, the width of the opening of the mounting groove is smaller than the outer diameter of the suspension spring.

[0018] Furthermore, a flared guide opening is provided on the outer edge of the opening of the assembly slot.

[0019] A compressor is provided with the aforementioned compressor screw oil pump device.

[0020] Compared with the prior art, this utility model has the following advantages:

[0021] As described above, this utility model relates to a spiral oil pump device for compressors. When applied to a compressor, a protrusion is provided at the lower end of the oil suction core, eliminating the need for a cross groove at the bottom of the oil suction core. This results in a uniform wall thickness of the oil suction core and a uniform gap between the oil suction pipe and the oil suction core, maintaining a small gap and achieving a high oil delivery rate. During operation, the wear between the two is reduced, minimizing abnormal noise. The suspension spring is inserted into the assembly slot, with its circumferential outer wall abutting the lower end of the arc-shaped protrusion. The contact between the suspension spring and the arc-shaped protrusion is point-contact. During the high-speed rotation of the crankshaft, which drives the oil to rise and impact the oil suction core, abnormal noise is less likely to be generated between the oil suction core and the suspension spring. Furthermore, the suspension spring can be a strip-shaped structure without the need for an inverted U-shaped rib structure in the middle. The suspension spring and the assembly slot are connected by a snap-fit ​​mechanism, allowing for easy insertion into the assembly slot and resulting in high production assembly efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0023] Figure 1 This is a cross-sectional view of the screw pump oil device for the compressor in Embodiment 1 of this utility model;

[0024] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0025] Figure 3 This is a front view of the oil suction tube core and protrusion in Embodiment 1 of this utility model;

[0026] Figure 4 This is a bottom view of the oil suction tube core and protrusion in Embodiment 1 of this utility model;

[0027] Figure 5 This is a top view of the oil suction tube core and protrusion in Embodiment 1 of this utility model;

[0028] Figure 6 This is a cross-sectional view of the oil suction tube core and the protrusion in Embodiment 1 of this utility model;

[0029] Figure 7 This is a front view of the suspension spring in Embodiment 1 of this utility model;

[0030] Figure 8 This is a front view of the oil suction tube core and protrusion in Embodiment 2 of this utility model. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] Example 1:

[0038] like Figures 1 to 7 As shown, the compressor oil pump device in this embodiment includes a crankshaft 1, an oil suction pipe 2, an oil suction pipe core 3, a protrusion 4, and a suspension spring 5.

[0039] The lower end of the crankshaft 1 is provided with an oil port 11, and the crankshaft 1 is provided with an oil passage 12 that communicates with the oil port 11. The lubricating oil 6 that flows out from between the oil suction pipe 2 and the oil suction pipe core 3 continues to rise through the oil port 11 and the oil passage 12.

[0040] The oil suction pipe 2 is a sleeve-shaped structure, and its upper end is interference-fitted to the oil port 11.

[0041] The oil suction core 3 is located inside the oil suction pipe 2, with a gap between them. An oil groove 31 is provided on the outer circumferential side of the oil suction core 3, spirally arranged along its axial direction. The oil suction core 3 has a frustum-shaped structure, with the outer diameter of its upper end 0.02 mm shorter than that of its lower end. This minimizes the gap between the oil suction pipe 2 and the oil suction core 3, while allowing for a certain degree of oscillation between the upper and lower ends, reducing wear during operation. The spiral angle of the oil groove 312 is set to 23° to increase the amount of lubricating oil delivered.

[0042] The protrusion 4 has a quasi-cubic parallelepiped structure and is located at the lower end of the oil suction tube core 3. An assembly groove 41 is formed on the protrusion 4, which penetrates the opposite side of the protrusion 4. An arc-shaped protrusion 411 is provided on the upper end surface inside the assembly groove 41. The arc-shaped protrusion 411 is set as a semi-cylinder.

[0043] A protrusion 4 is provided at the lower end of the oil suction tube core 3, instead of a cross groove at the bottom of the oil suction tube core 3. This makes the wall thickness of the oil suction tube core 3 uniform, and the gap between the oil suction tube 2 and the oil suction tube core 3 uniform. This can maintain a small gap, achieve a high oil loading capacity, and reduce the degree of wear between the two during operation, thus reducing the generation of abnormal noise.

[0044] The suspension spring 5 passes through the opening 412 of the assembly groove 41 and enters the interior of the assembly groove 41 to achieve a limiting fit between the suspension spring 5 and the assembly groove 41. The outer circumferential wall of the suspension spring 5 abuts against the lower end of the arc-shaped protrusion 411. The outer circumferential wall of the suspension spring 5 intersects and is tangent to the outer wall of the semi-cylindrical body to achieve point contact between the suspension spring 5 and the arc-shaped protrusion 411. The crankshaft 1 drives the oil suction pipe 2 to rotate. Due to the limiting fit between the suspension spring 5 and the assembly groove 41, the oil suction pipe 2 rotates relative to the oil suction pipe core 3. During the process of the crankshaft 1 rotating at high speed and driving the oil to rise and impact the oil suction pipe core 3, abnormal noise is not easily generated between the oil suction pipe core 3 and the suspension spring 5. The assembly groove 41 is provided with an opening 412, which is located on the lower end face of the protrusion 4. The width of the opening 412 is slightly smaller than the outer diameter of the suspension spring 5. When the suspension spring 5 is inserted into the assembly slot 41, it compresses the opening 412, causing the assembly slot 41 to deform and expand. After the suspension spring 5 is inserted into the assembly slot 41, the assembly slot 41 returns to its original state. This facilitates the insertion of the suspension spring 5 into the assembly slot, simplifying the assembly operation and improving production assembly efficiency. A flared guide port 413 is provided along the outer edge of the opening 412 of the assembly slot 41 to facilitate guiding the suspension spring 5 along the guide port 413 to the opening 412, further improving production assembly efficiency.

[0045] A compressor is provided with the compressor oil pump device described above in this embodiment.

[0046] Example 2:

[0047] like Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that the opening 412 of the assembly groove 41 is located on the side of the protrusion 4, and the suspension spring 5 passes through the opening 412 on the side of the protrusion 4 into the interior of the assembly groove 41.

[0048] This concludes the detailed description of this embodiment in conjunction with the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the compressor screw pump oil device of this utility model. This utility model discloses a spiral oil pump device for compressors. When applied to a compressor, a protrusion 4 is provided at the lower end of the oil suction core 3, eliminating the need for a cross groove at the bottom of the oil suction core 3. This ensures that the wall thickness of the oil suction core 3 is uniform, and the gap between the oil suction pipe 2 and the oil suction core 3 is uniform, maintaining a small gap and achieving a high oil loading capacity. During operation, the wear between the two is low, reducing the generation of abnormal noise. The suspension spring 5 is inserted into the interior of the assembly groove 41, with the outer circumferential side of the suspension spring 5 abutting the lower end of the arc-shaped protrusion 411. The suspension spring 5 and the arc-shaped protrusion 411 are in point contact. During the process of the crankshaft 1 rotating at high speed and driving the oil to rise and impact the oil suction core 3, abnormal noise is less likely to be generated between the oil suction core 3 and the suspension spring 5. In addition, the suspension spring 5 can be a strip structure as a whole, without the need for an inverted U-shaped rib structure in the middle. The suspension spring 5 and the assembly groove 41 are connected by a snap-fit ​​method, which can be easily inserted into the assembly groove 41, resulting in high production assembly efficiency.

[0049] Of course, the above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model and should be protected by the present utility model.

Claims

1. A screw pump oil device for a compressor, characterized in that, include: The crankshaft has an oil port at its lower end and an oil passage that communicates with the oil port. An oil suction pipe, the upper end of which is fitted with the assembly oil port; An oil suction tube core is located inside the oil suction tube, with a gap between the oil suction tube core and the oil suction tube. An oil groove is provided on the outer circumferential side of the oil suction tube core, and the oil groove is spirally arranged along the axial direction of the oil suction tube core. A protrusion is provided at the lower end of the oil suction tube core. An assembly groove is provided on the protrusion, which penetrates the opposite side of the protrusion. An arc-shaped protrusion is provided on the upper end surface inside the assembly groove. A suspension spring is inserted into the interior of the mounting groove, and the outer circumferential wall of the suspension spring abuts against the lower end of the arc-shaped protrusion.

2. The compressor screw pump oil device according to claim 1, characterized in that, The opening of the assembly groove is located on the lower end face of the protrusion.

3. The compressor screw pump oil device according to claim 1, characterized in that, The opening of the assembly groove is located on the side of the protrusion.

4. The compressor screw pump oil device according to claim 1, characterized in that, The arc-shaped protrusion is configured as a semi-cylinder, and the outer wall of the circumferential side of the suspension spring is intersected and tangent to the outer wall of the semi-cylinder.

5. The compressor screw pump oil device according to claim 1, characterized in that, The oil suction tube core has a frustum-shaped structure.

6. The compressor screw pump oil device according to claim 5, characterized in that, The outer diameter of the upper end of the oil suction tube is 0.02mm shorter than the outer diameter of the lower end of the oil suction tube.

7. The compressor screw pump oil device according to claim 1, characterized in that, The helix angle of the oil tank is 23°.

8. The compressor screw pump oil device according to claim 1, characterized in that, The width of the opening of the assembly slot is smaller than the outer diameter of the suspension spring.

9. The compressor screw pump oil device according to claim 8, characterized in that, The assembly slot has a flared guide port on the outer edge of its opening.

10. A compressor, characterized in that: The compressor is equipped with a compressor spiral oil pump device as described in any one of claims 1 to 9.

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