Crankshaft, compressor and refrigeration equipment

Abstract

The utility model provides a crankshaft, a compressor and refrigeration equipment. The crankshaft comprises a central oil hole which is arranged from one end of the crankshaft along a rotation axis, and the central oil hole is a variable-diameter hole; the radial holes are formed in different heights of the radial surface of the crankshaft and are communicated with the central oil hole; the radial holes comprise a first radial hole communicated with the central oil hole, and the first radial hole is communicated with the inner circumference of an upper bearing of the compressor; and the height h from the first radial hole to the reducing part of the central oil hole is greater than or equal to 2mm and less than or equal to 20mm. By setting the height range from the first radial hole in the crankshaft to the reducing position of the central oil hole, the effective lubricating oil pumping quantity of the compressor is ensured, the ineffective oil pumping quantity and the total oil pumping quantity are reduced, the lubricity of the compressor is improved, and the reliability of the compressor is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration equipment technical field, concretely relates to a crankshaft, compressor and refrigeration equipment. BACKGROUND

[0002] The compressor is the core component of the refrigeration equipment and is also the key point affecting the development of the refrigeration industry. In the rotor compressor, the crankshaft transmits the rotating force of the motor to the piston in the cylinder to compress the refrigerant. The main friction pairs in the rotor compressor are the long and short shafts of the crankshaft and the inner wall of the upper and lower bearings and the eccentric part of the crankshaft and the inner circle of the piston. The lubrication between the friction pairs can ensure the performance and reliability of the compressor.

[0003] To meet the lubrication requirements of the compressor, the crankshaft of the rotor compressor is provided with a central oil hole and a radial hole. The rotation of the crankshaft drives the oil pumping vane to pump oil to these oil holes by centrifugal force and rotational inertia force, so as to realize the smooth flow of the pumped oil to each friction pair and further lubricate each friction pair.

[0004] The oil pumped by the compressor includes effective pumped oil and ineffective pumped oil. The effective pumped oil is the lubricating oil pumped into the crankshaft central oil hole and then flows to each friction pair through the radial hole of the crankshaft. The ineffective pumped oil is the lubricating oil pumped out from the crankshaft central oil hole and then from the radial hole of the crankshaft, but does not flow into each friction pair. If the amount of effective pumped oil is insufficient, it will lead to insufficient lubrication between each friction pair of the compressor, affecting the performance and reliability of the compressor. If the amount of ineffective pumped oil is too large, it is easy to cause high oil discharge rate of the compressor, which seriously affects the performance of the refrigeration system and the compressor, and also causes large fluctuation of the oil level at the bottom of the compressor oil pool, insufficient oil level under severe working conditions, risk of oil-free lubrication, and affects the performance and reliability of the compressor.

[0005] The compressor in the prior art has the problems of less effective pumped oil and large ineffective pumped oil.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the utility model, and therefore can include information that does not constitute prior art known to those skilled in the art. UTILITY MODEL CONTENT

[0007] In view of the problems in the prior art, the purpose of the utility model is to provide a crankshaft, compressor and refrigeration equipment, which can ensure the effective lubrication of the pumped oil while reducing the ineffective pumped oil and the total pumped oil.

[0008] The utility model provides a crankshaft, which comprises:

[0009] A central oil hole is arranged along the rotation axis from one end of the crankshaft, and the central oil hole is a variable-diameter hole;

[0010] A plurality of radial holes are arranged at different heights of a radial surface of the crankshaft and communicate with the central oil hole; the radial holes include a first radial hole communicating with the central oil hole, and the first radial hole communicates with an inner periphery of an upper bearing of the compressor;

[0011] The height h of the first radial hole to the variable-diameter position of the central oil hole satisfies 2mm≤h≤20mm.

[0012] In some embodiments, the crankshaft includes a long shaft portion, an eccentric portion and a short shaft portion arranged in sequence along an axial direction, a tool withdrawal groove is arranged at a position close to the eccentric portion of the long shaft portion, and the first radial hole is arranged at the tool withdrawal groove.

[0013] In some embodiments, the central oil hole includes a first central oil hole with a first diameter and a second central oil hole with a second diameter, the first central oil hole extends from the short shaft portion of the crankshaft to the long shaft portion of the crankshaft, and the second central oil hole is arranged at the long shaft portion of the crankshaft.

[0014] In some embodiments, the radial holes further include a second radial hole communicating with the second central oil hole.

[0015] In some embodiments, the radial holes further include a third radial hole and a fourth radial hole, the third radial hole communicates with a cylinder of the compressor, and the fourth radial hole communicates with an inner periphery of a lower bearing of the compressor.

[0016] In some embodiments, the height h of the first radial hole to the variable-diameter position of the central oil hole satisfies 2mm≤h≤10mm.

[0017] Embodiments of the present application also provide a compressor comprising the crankshaft.

[0018] In some embodiments, the compressor further comprises a pump body assembly, the pump body assembly comprises an upper bearing, a lower bearing, a cylinder and a piston located between the upper bearing and the lower bearing, both ends of the crankshaft pass through end portions of the upper bearing and the lower bearing, and the piston is sleeved on the eccentric portion of the crankshaft.

[0019] In some embodiments, the compressor further comprises a motor, the motor comprises an output shaft, and the output shaft is connected to the long shaft portion of the crankshaft.

[0020] Embodiments of the present application also provide a refrigeration device comprising the compressor.

[0021] In some embodiments, the crankshaft, the compressor and the refrigeration device provided by the present application have the following advantages:

[0022] By setting the height range of the first radial hole to the variable diameter position of the central oil hole, the effective lubricating pump oil amount of the compressor is ensured, while the invalid pump oil and total pump oil amount are reduced, the lubricity of the compressor is improved, and the reliability of the compressor is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof as read in conjunction with the accompanying drawings.

[0024] Figure 1 is a cross-sectional view of a crankshaft of an embodiment of the present application;

[0025] Figure 2 A graph showing the percentage reduction in invalid pump oil amount of a compressor installed with the crankshaft of the embodiment of the present application compared with a compressor installed with a crankshaft of the prior art is shown;

[0026] Figure 3 A graph showing the percentage increase in effective pump oil amount of a compressor installed with the crankshaft of the embodiment of the present application compared with a compressor installed with a crankshaft of the prior art is shown.

[0027] REFERENCE NUMERALS:

[0028] 10 central oil hole

[0029] 11 first central oil hole

[0030] 12 second central oil hole

[0031] 20 radial hole

[0032] 21 first radial hole

[0033] 22 second radial hole

[0034] 23 third radial hole

[0035] 110 long shaft portion

[0036] 120 eccentric portion

[0037] 130 short shaft portion DETAILED DESCRIPTION

[0038] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the several views.

[0039] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0040] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] It should be further understood that the terms "comprising" or "including" indicate the presence of a feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" as used herein are interpreted as inclusive, or mean any one or any combination thereof. Therefore, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition only arise when a combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0042] To address the problems in the prior art, this utility model provides a crankshaft. Figure 1 A cross-sectional view of a crankshaft provided in an embodiment of the present invention is shown, as follows: Figure 1 As shown, the crankshaft includes:

[0043] The central oil hole 10 is set from one end of the crankshaft along the axis of rotation, and the central oil hole 10 is a variable diameter hole;

[0044] Multiple radial holes 20 are provided at different heights on the radial surface of the crankshaft and are connected to the central oil hole 10; the radial holes 20 include a first radial hole 21 connected to the central oil hole 10, and the first radial hole 21 is connected to the inner circumference of the upper bearing of the compressor;

[0045] The height h from the first radial hole 21 to the diameter change point of the central oil hole 10 satisfies: 2mm≤h≤20mm.

[0046] The inventor has found that if the height h from the first radial hole 21 to the center oil hole 10 is not reasonably designed, the effective pump oil amount at the upper helical groove of the upper bearing will be less, the ineffective pump oil amount will be large, the oil level stability of the compressor oil pool will be poor, and the reliability of the compressor will be affected. Therefore, by setting the height h range of the first radial hole 21 to the center oil hole 10 of the crankshaft, the effective lubrication pump oil amount of the compressor is ensured, the ineffective pump oil and total pump oil amount are reduced, the lubrication of the compressor is improved, and the reliability of the compressor is ensured.

[0047] In a preferred embodiment, h satisfies 2mm≤h≤10mm, and h is 3mm, 5mm, 7mm, 9mm, for example. In a more preferred embodiment, h satisfies 4mm≤h≤8mm, and h is 4.5mm, 5.5mm, 6.5mm, 7.5mm, for example.

[0048] Further, please refer to Figure 1 , the crankshaft comprises a long shaft portion 110, an eccentric portion 120 and a short shaft portion 130 arranged in sequence along the axial direction. Generally, the axis of the long shaft portion 110 is coaxial with the axis of the short shaft portion 130, and the axis of the eccentric portion 120 is non-coaxial with the axes of the long shaft portion 110 and the short shaft portion 130. The long shaft portion 110 is provided with a tool withdrawal groove at a position close to the eccentric portion 120, and the first radial hole 21 is arranged at the tool withdrawal groove. The upper bearing is arranged near the tool withdrawal groove, and the first radial hole 21 enables lubricating oil to flow smoothly into the friction pair between the long shaft portion 110 and the upper bearing for lubrication.

[0049] Further, the center oil hole 10 comprises a first center oil hole 11 with a first diameter and a second center oil hole 12 with a second diameter. The first center oil hole 11 extends from the short shaft portion 130 of the crankshaft to the long shaft portion 110 of the crankshaft, and the second center oil hole 12 is arranged at the long shaft portion 110 of the crankshaft. The first diameter is greater than the second diameter.

[0050] In addition, by limiting the height h range of the center oil hole 10 from the variable diameter position to the first radial hole 21, the axial length of the first center oil hole 11 can be limited synchronously. Since the first diameter of the first center oil hole 11 is greater than the second diameter of the second center oil hole 12, i.e. the length of the large diameter section of the center oil hole 10 is limited, the strength of the crankshaft can be improved accordingly.

[0051] Further, the radial hole 20 further comprises a second radial hole 22 in communication with the second center oil hole 12. The second radial hole 22 is used to smoothly discharge the gas remaining in the center oil hole 10 of the crankshaft during the oil pumping process. The less lubricating oil flowing out of the second radial hole 22, the less ineffective pump oil.

[0052] Further, the radial hole 20 further comprises a third radial hole 23 and a fourth radial hole (not shown in the figure), the third radial hole 23 being communicated with the cylinder of the compressor, and the fourth radial hole being communicated with the inner periphery of the lower bearing of the compressor. The third radial hole 23 is used to realize the smooth flow of lubricating oil into the friction pair between the eccentric part 120 of the crankshaft and the cylinder, so as to realize lubrication. The fourth radial hole is used to realize the smooth flow of lubricating oil into the friction pair between the short shaft of the crankshaft and the lower bearing, so as to realize lubrication. It should be noted that the number and position of the radial hole 20 are not limited to the above examples.

[0053] Further, the utility model discloses an embodiment further provides a compressor, including the crankshaft as described above. The compressor includes the crankshaft described above, and therefore can obtain all the technical effects of the crankshaft, which will not be repeated here.

[0054] Further, the compressor further comprises a pump body assembly, and the pump body assembly comprises an upper bearing, a lower bearing, a cylinder located between the upper bearing and the lower bearing and a piston. The two ends of the crankshaft pass through the end portions of the upper bearing and the lower bearing respectively, and the piston is sleeved on the eccentric part of the crankshaft. The cylinder can be a single cylinder, a double cylinder or a multi-cylinder.

[0055] Further, the compressor further comprises a motor, and the motor comprises an output shaft connected to the long shaft part of the crankshaft.

[0056] When the motor is powered on and runs, the output shaft drives the crankshaft to rotate synchronously, the crankshaft transmits the rotating force of the motor to the piston, the piston makes periodic motion in the cylinder and divides the cylinder into a suction chamber and a compression chamber, and the compressor of the utility model is completed.

[0057] In order to further explore the beneficial effects of the crankshaft provided by the embodiment of the utility model, the compressor provided by the utility model and the compressor in the prior art are compared by simulating the oil pumping amount under the same working condition.

[0058] As shown in Figure 2 As shown in Figure 2It can be observed that when h is in the range of 2mm to 20mm, the K value is positive, meaning that the compressor provided by this invention has less ineffective oil pumping volume compared to the prior art. When h exceeds the range of 20mm, the K value is negative, meaning that the compressor provided by this invention has more ineffective oil pumping volume than the prior art. When h is in the range of 2mm to 10mm, the K value is closer to 100%, meaning that the compressor provided by this invention has a greater reduction in ineffective oil pumping volume than the prior art.

[0059] like Figure 3 As shown, the effective oil pumping volume N of the compressor provided by this utility model is compared with the effective oil pumping volume Q of the compressor in the prior art. The horizontal axis represents the height range of h, and the vertical axis represents the percentage increase J of the effective oil pumping volume (calculated by: J = (NQ) / Q). It can be seen that the percentage decrease J of the effective pumping volume changes with h. When J is greater than zero, it indicates that the N value is greater than the Q value, meaning the effective oil pumping volume of the compressor provided by this utility model is greater than the effective oil pumping volume of the compressor in the prior art; when J is zero, it indicates that the N value is equal to the Q value, meaning the effective oil pumping volume of the compressor provided by this utility model is the same as the effective oil pumping volume of the compressor in the prior art; when J is less than zero, it indicates that the N value is less than the Q value, meaning the effective oil pumping volume of the compressor provided by this utility model is less than the effective oil pumping volume of the compressor in the prior art. Figure 3 It can be observed that when h is in the range of 2mm to 20mm, the J value is positive, meaning that the effective oil pumping volume of the compressor provided by this utility model is greater than that of the prior art. When h exceeds the range of 20mm, the J value is negative, meaning that the effective oil pumping volume of the compressor provided by this utility model decreases instead of increasing compared to the prior art. When h is in the range of 2mm to 10mm, the J value increases significantly, meaning that the effective oil pumping volume of the compressor provided by this utility model increases by a greater margin than that of the prior art. When h is in the range of 4mm to 8mm, the increase in the effective oil pumping volume of the compressor provided by this utility model is optimal.

[0060] Therefore, when h is within the range of 2mm to 20mm, the effective oil pumping volume of the compressor provided by this invention increases and the ineffective oil output decreases, thereby increasing the oil level stability of the compressor and significantly improving its reliability. Furthermore, considering that a lower ineffective oil pumping volume is better and a higher effective oil pumping volume is better, and taking into account the combined effects of ineffective and effective oil pumping, the beneficial effects of the compressor provided by this invention are better when h is within the range of 2mm to 10mm, and optimal when h is within the range of 4mm to 8mm.

[0061] Furthermore, this embodiment of the invention also provides a refrigeration device, including the compressor described above. This refrigeration device achieves all the technical effects of the compressor described above, which will not be repeated here.

[0062] In summary, the crankshaft, compressor and refrigeration equipment provided by the utility model have the following advantages:

[0063] By setting the height range of the first radial hole to the variable diameter position of the center oil hole, the effective lubrication pump oil amount of the compressor is ensured, the invalid pump oil and total pump oil amount are reduced, the lubricity of the compressor is improved, and the reliability of the compressor is ensured.

[0064] The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them should be regarded as belonging to the protection scope of the utility model.

Claims

1. A crankshaft, characterized by The crankshaft comprises: a central oil hole arranged along the rotation axis from one end of the crankshaft, the central oil hole being a variable-diameter hole; a plurality of radial holes arranged at different heights of the radial surface of the crankshaft and communicating with the central oil hole; the radial holes comprise a first radial hole communicating with the central oil hole, the first radial hole communicating with the inner periphery of the upper bearing of the compressor; the height h of the first radial hole to the variable-diameter position of the central oil hole satisfies 2mm≤h≤20mm.

2. The crankshaft of claim 1 wherein, The crankshaft comprises a long shaft portion, an eccentric portion and a short shaft portion arranged in sequence along the axial direction, a tool withdrawal groove is arranged at the position close to the eccentric portion of the long shaft portion, and the first radial hole is arranged at the tool withdrawal groove.

3. The crankshaft of claim 2, wherein The central oil hole comprises a first central oil hole with a first diameter and a second central oil hole with a second diameter, the first central oil hole extends from the short shaft portion of the crankshaft to the long shaft portion of the crankshaft, and the second central oil hole is arranged at the long shaft portion of the crankshaft.

4. The crankshaft of claim 3, wherein The radial holes further comprise a second radial hole communicating with the second central oil hole.

5. The crankshaft of claim 1 wherein, The radial holes further comprise a third radial hole and a fourth radial hole, the third radial hole communicates with the cylinder of the compressor, and the fourth radial hole communicates with the inner periphery of the lower bearing of the compressor.

6. The crankshaft of claim 1 wherein, The height h of the first radial hole to the variable-diameter position of the central oil hole satisfies 2mm≤h≤10mm.

7. A compressor characterized by, The compressor comprises the crankshaft according to any one of claims 1 to 6.

8. The compressor of claim 7, wherein, The compressor further comprises a pump body assembly, the pump body assembly comprising an upper bearing, a lower bearing, a cylinder and a piston arranged between the upper bearing and the lower bearing; the two ends of the crankshaft pass through the end portions of the upper bearing and the lower bearing, respectively, and the piston is sleeved on the eccentric portion of the crankshaft.

9. The compressor of claim 7, wherein, The compressor further comprises a motor, the motor comprising an output shaft connected to the long shaft portion of the crankshaft.

10. A refrigeration appliance characterized in that, The compressor comprises the crankshaft according to any one of claims 7 to 9.

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