Roller compressor and air conditioner

Abstract

The application relates to the field of air conditioners, in particular to a roller compressor and an air conditioner. The roller compressor comprises a crankshaft provided with an eccentric part; a roller is sleeved on the eccentric part, the roller is formed with an inner circular surface, the inner circular surface is provided with a spiral groove, and the spiral groove extends to both axial ends of the roller; the spiral groove has the same rotating direction from top to bottom as the rotating direction of the crankshaft, so that the lubrication between the roller and the eccentric part is better with the increase of the rotating speed of the crankshaft.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioners, in particular to a rolling compressor and an air conditioner. BACKGROUND

[0002] In the operation process of the rolling compressor, the rolling and the upper and lower flange end faces (or the flange and the partition plate end face) and the vane head rub against each other, and the friction surface between the rolling and the crankshaft is approximately a complete circumferential surface. The multiple friction causes the temperature to rise, generates a large thermal deformation, and further reduces the axial gap between the rolling and the two sides of the matching end face (the upper and lower flange end face or the flange and the partition plate end face); at the same time, the vane is offset due to the unbalanced load in the axial direction of the rolling, and eventually causes the rolling and the flange end face or the partition plate end face to be severely worn; in addition, the eccentric assembly composed of the eccentric part of the crankshaft and the rolling is a solid structure, the eccentric mass is large, and the vibration displacement caused by the operation is large.

[0003] When the rolling compressor rotates at high speed, the oil return is too fast, which leads to insufficient lubrication, and the lubrication between the rolling and the eccentric part is often higher as the rotational speed of the crankshaft increases.

[0004] Currently, there is no good solution to how to make the lubrication between the rolling and the eccentric part better as the rotational speed of the crankshaft increases. SUMMARY

[0005] In order to make the lubrication between the rolling and the eccentric part better as the rotational speed of the crankshaft increases, a rolling compressor and an air conditioner are provided.

[0006] In one aspect, the present application provides a rolling compressor, comprising:

[0007] a crankshaft provided with an eccentric part;

[0008] a rolling sleeve provided on the eccentric part, the rolling is formed with an inner circular surface, the inner circular surface is provided with a spiral groove, and the spiral groove extends to both axial ends of the rolling;

[0009] The rotation direction of the spiral groove from top to bottom is the same as the rotation direction of the crankshaft.

[0010] Preferably, the opening area of the spiral groove at the upper end surface of the rolling is greater than the opening area of the spiral groove at the lower end surface of the rolling.

[0011] Preferably, the flow area of the spiral groove gradually decreases from top to bottom.

[0012] Preferably, the minimum flow area of the spiral groove is S, the economic rotation speed of the crankshaft is ω, S = fω, f is a lubrication coefficient, and 0.001 ≤ f ≤ 0.002.

[0013] Preferably, the radial depth of the helical groove is h1, the single-side thickness of the roller is h2, and 0.4h2≤h1≤0.6h2.

[0014] Preferably, the pitch of the helical groove is P, and the axial height of the roller is h3, and 0.2h3≤P≤0.4h3.

[0015] Preferably, the pitch of the helical groove is P, the inner surface of the roller forms an inner circular hole, the diameter of the inner circular hole is D, when h1≥0.3D, 0.5h1≤P≤0.7h1; and when h1<0.3D, P=0.4h1.

[0016] Preferably, a plurality of grooves are formed on the inner surface of the helical groove.

[0017] Preferably, the plurality of grooves are distributed more on the upper part of the helical groove and less on the lower part of the helical groove.

[0018] In another aspect, the application also provides an air conditioner comprising the roller compressor.

[0019] The application sets the helical groove on the inner circular surface of the roller, the rotation direction of the helical groove is consistent with the rotation direction of the eccentric part, when the eccentric part rotates, the roller rotates around its own axis while revolving, the rotation of the roller makes the lubricating oil in the helical groove have a tendency to move upward, and further slows down the flow speed of the lubricating oil in the helical groove; and the resistance of the lubricating oil in the helical groove is positively correlated with the rotation speed of the eccentric part, that is, the higher the rotation speed of the eccentric part, the slower the flow speed of the lubricating oil, which is beneficial to improve the lubricating effect between the roller and the eccentric part, and is beneficial to ensure that there is enough lubricating oil on the lubricating oil path for lubrication. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an exploded view of the crankshaft, cylinder, roller and accessories of the embodiment of the application;

[0021] Figure 2 It is a first sectional view of the crankshaft, cylinder, roller and accessories of the embodiment of the application when they are assembled together;

[0022] Figure 3 It is a second sectional view of the crankshaft, cylinder, roller and accessories of the embodiment of the application when they are assembled together;

[0023] Figure 4 It is a schematic view of the crankshaft and the roller of the embodiment of the application;

[0024] Figure 5 It is a sectional view of the roller of the embodiment of the application;

[0025] Figure 6Figure 1 is an axial sectional view of the crankshaft, cylinder, roller and its accessories assembled together according to an embodiment of the present application.

[0026] Reference signs are indicated as:

[0027] 1, crankshaft; 2, eccentric part; 3, roller; 301, helical groove; 4, upper flange; 5, lower flange; 6, sliding vane; 7, cylinder. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0029] The terms used in the embodiments of the present application are merely for the purpose of describing particular embodiments and are not intended to limit the present application. The singular forms "a", "said" 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.

[0030] It should be understood that the term "and / or" used herein is merely to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship; "first", "second" in this paper are merely to distinguish different technical features, and not have a sequence; "upper", "lower", "front", "rear" in this paper are also only to make the position relationship of the technical features more convenient to explain, and have certain meaning only in combination with actual use conditions or in combination with the specific position description in the preceding text, and not an absolute position relationship.

[0031] It should also be noted that the terms "comprising", "containing" or any other variants thereof are intended to cover non-exclusive inclusion, so that the goods or systems including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such goods or systems. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the goods or systems including the element.

[0032] The present application relates to the field of air conditioners, in particular to a rolling compressor and an air conditioner. In the operation process of the rolling compressor, the rolling and the upper and lower flange end faces (or the flange and the end face of the partition plate) and the vane head rub against each other, and the friction surface between the rolling and the crankshaft is approximately a complete circumferential surface. The multiple friction causes the temperature to rise, generates a large thermal deformation, and further reduces the axial gap between the rolling and the two sides of the matching end face (the upper and lower flange end faces or the flange and the end face of the partition plate); at the same time, the vane is offset due to the unbalanced load in the axial direction of the rolling, and eventually causes the rolling and the flange end face or the end face of the partition plate to be seriously worn; in addition, the eccentric assembly composed of the eccentric part of the crankshaft and the rolling is a solid structure, the eccentric mass is large, and the vibration displacement caused by the operation is large. When the rolling compressor rotates at high speed, the oil return is too fast, which leads to insufficient lubrication, and the lubrication between the rolling and the eccentric part is often higher as the rotational speed of the crankshaft increases.

[0033] In order to better lubricate the rolling and the eccentric part as the rotational speed of the crankshaft increases, a rolling compressor and an air conditioner are provided.

[0034] On the one hand, as shown in Figures 1-6 The present application provides a rolling compressor, comprising: a crankshaft 1 provided with an eccentric part 2; a rolling 3 sleeved on the eccentric part 2, the rolling 3 is formed with an inner circular surface, the inner circular surface is provided with a spiral groove 301, the spiral groove 301 extends to both axial ends of the rolling 3; the rotation direction of the spiral groove 301 from top to bottom is the same as the rotation direction of the crankshaft 1.

[0035] The length of the crankshaft 1 of the rolling compressor is in the up-down direction in the working state, and "up" and "down" in the claims and the description are used to more clearly introduce the orientation terms adopted by the present application.

[0036] The lubricating oil of the rolling compressor enters the crankshaft 1 from the lower end of the crankshaft 1, the lubricating oil enters the upper flange 4 oil groove through the center oil hole and the side oil hole, and then passes through the upper cavity of the crankshaft 1 and the rolling 3 and the spiral groove 301 of the inner circle of the rolling 3 from top to bottom, and then passes through the lower flange 5 oil groove after passing through the spiral groove 301, and finally returns to the oil pool.

[0037] From top to bottom, as shown in Figure 6As shown, the general rotation direction of the crankshaft 1 is clockwise, and at this time, the rotation direction of the spiral groove 301 is also clockwise. During the rotation of the crankshaft 1, the roller 3 rotates relative to the eccentric part 2, and the lubricating oil in the spiral groove 301 has a tendency to move upward along the spiral groove 301 under the action of centrifugal force. Since the eccentric part 2 also rotates clockwise relative to the roller 3, the frictional drag force generated by the eccentric part 2 on the lubricating oil also has the effect of making the lubricating oil move upward along the spiral groove 301 (equivalent to forming a pressure difference opposite to the oil path direction in the lubricating oil return path), thereby increasing the resistance to the downward flow of the lubricating oil and slowing down the flow speed of the lubricating oil in the spiral groove 301. Since the resistance to the downward flow of the lubricating oil is positively correlated with the speed of the rotation of the crankshaft 1, when the compressor is working at high frequency (the rotation speed of the crankshaft 1 is relatively fast), the flow speed of the lubricating oil in the lubricating oil path is reduced, effectively ensuring the flow of the lubricating oil in the lubricating area and ensuring the lubrication effect of the roller compressor when working at high frequency, effectively reducing the damage caused by insufficient lubrication. When the rotation direction of the crankshaft 1 is counterclockwise from top to bottom, the rotation direction of the spiral groove 301 from top to bottom is also counterclockwise.

[0038] Since the spiral groove 301 is formed on the roller 3, the wall thickness of part of the roller 3 is reduced, the stiffness of the roller 3 is weakened (the flexibility is improved), and the extrusion force between the end face of the roller 3 and the upper flange 4, the lower flange 5 or the partition plate is reduced, and the wear degree between the end face of the roller 3 and the upper flange 4, the lower flange 5 or the partition plate is reduced; the head of the sliding vane 6 abuts against the outer peripheral wall of the roller 3, and in operation, the force between the sliding vane 6 and the roller 3 in the axial direction of the roller 3 will be unevenly distributed due to the unbalanced load, which will cause the sliding vane 6 to wear faster at one end of the roller 3 in the axial direction, resulting in air leakage; the flexibility of the roller 3 is improved, and the roller 3 has a certain deformation ability in the radial direction, so that the force between the sliding vane 6 and the roller 3 is more balanced, the unbalanced wear of the sliding vane 6 and the roller 3 is effectively reduced, the service life of the roller compressor is improved, and air leakage caused thereby is also avoided.

[0039] The spiral groove 301 formed on the roller 3 reduces the contact area (friction area) between the roller 3 and the eccentric part 2, increases the storage of lubricating oil between the roller 3 and the eccentric part 2, is conducive to improving the lubrication effect, reducing the friction between the roller 3 and the eccentric part 2, and further conducive to the rotation of the roller 3, which reduces the friction between the roller 3 and the cylinder 7.

[0040] The present lubricating structure is provided with an axial linear lubricating groove on the roller 3. The linear lubricating groove is arranged so that the lubricating oil in the lubricating groove can lubricate the outer circumferential surface of the eccentric part 2 only when the crankshaft 1 rotates one round. The spiral groove 301 of the present application surrounds the inner circumferential surface of the roller 3, so that the outer circumferential surface of the eccentric part 2 can be lubricated when the crankshaft 1 rotates a small angle. The spiral groove 301 is arranged to reduce the weight of the eccentric assembly (the eccentric part 2 and the roller 3) compared with the linear lubricating groove, which is beneficial to reduce the mass of the compressor.

[0041] Preferably, the opening area of the spiral groove 301 at the upper end surface of the roller 3 is greater than the opening area of the spiral groove 301 at the lower end surface of the roller 3.

[0042] The opening of the spiral groove 301 at the upper end surface of the roller 3 is greater than the opening at the lower end surface, which is beneficial to the lubricating oil entering the spiral groove 301 and reducing the flow speed of the lubricating oil in the spiral groove 301, thereby improving the lubricating effect between the roller 3 and the eccentric part 2.

[0043] Preferably, the flow area of the spiral groove 301 gradually decreases from top to bottom.

[0044] Due to the flow resistance of the lubricating oil in the spiral groove 301, and the resistance is positively correlated with the flow resistance. The flow area of the spiral groove 301 decreases from top to bottom to ensure the balance of the pressure of the lubricating oil in the spiral groove 301, so that the pressure of the lubricating oil on the outer circumferential surface of the eccentric part 2 is more balanced, thereby further improving the lubricating effect between the roller 3 and the eccentric part 2.

[0045] Preferably, the minimum flow area of the spiral groove 301 is S, the economic rotation speed of the crankshaft 1 is ω, S = fω, f is a lubrication coefficient, and 0.001 ≤ f ≤ 0.002.

[0046] Different specifications of roller compressors have different economic rotation speeds of the crankshaft 1. The minimum flow area of the spiral groove 301 is positively correlated with the economic rotation speed, which improves the applicability of the spiral groove 301 in different roller compressors. The lubrication coefficient f is related to the properties of the lubricating oil. The better the flowability of the lubricating oil, the smaller the value of f, and vice versa.

[0047] Preferably, as shown in Figure 5 the radial depth of the spiral groove 301 is h1, and the single-side thickness of the roller 3 is h2, then 0.4h2 ≤ h1 ≤ 0.6h2.

[0048] The thickness of the spiral groove 301 is arranged to consider its stiffness and certain softness. When 0.4h2 ≤ h1 ≤ 0.6h2, the stiffness and flexibility of the roller 3 are both good.

[0049] Preferably, the pitch of the helical groove 301 is P, the axial height of the roller 3 is h3, and 0.2h3≤P≤0.4h3.

[0050] The number of turns of the helical groove 301 and the axial height of the roller 3 are closely related. If the number of turns is too large, the flow speed of the lubricating oil in the helical groove 301 is too slow, which is not conducive to heat dissipation. If the number of turns is too small, the lubrication is insufficient. Therefore, 0.2h3≤P≤0.4h3, that is, the number of turns of the helical groove 301 is preferably 2.5 turns to 5 turns, which ensures lubrication and heat dissipation.

[0051] Preferably, the pitch of the helical groove 301 is P, the inner surface of the roller 3 forms an inner circular hole, the diameter of the inner circular hole is D, when h1≥0.3D, 0.5h1≤P≤0.7h1, and when h1<0.3D, P=0.4h1.

[0052] The pitch of the helical groove 301 is related to the diameter of the inner hole. The larger the diameter, the larger the pitch. The larger the diameter of the inner hole, the greater the linear velocity of the contact surface of the roller 3 and the eccentric part 2 at the same angular velocity. The greater the linear velocity, the greater the centrifugal force on the lubricating oil. When h1≥0.3D, the centrifugal force on the lubricating oil is relatively large, and the lubricating oil has a large upward movement tendency under the action of the centrifugal force. Therefore, 0.5h1≤P≤0.7h1 avoids the phenomenon that the number of turns of the helical groove 301 is too large, which causes the lubricating oil to be unable to flow downward. When h1<0.3D, the centrifugal force on the lubricating oil is relatively small, P=0.4h1, which ensures the lubrication and heat dissipation of the lubricating oil and facilitates design selection.

[0053] Preferably, a plurality of grooves are formed on the inner surface of the helical groove 301.

[0054] The grooves have the function of storing lubricating oil. When the oil pool lubrication is insufficient, the lubricating oil stored in the grooves in the helical groove 301 volatilizes at the friction temperature between the roller 3 and the eccentric part 2, and can lubricate between the roller 3 and the eccentric part 2.

[0055] Preferably, the plurality of grooves are distributed more in the upper part and less in the lower part in the helical groove 301.

[0056] Since the lubricating oil flows downward along the helical groove 301, when the lubricating oil is insufficient, the lower part of the helical groove 301 has relatively more lubricating oil than the upper part, and does not need too many grooves. In this way, the distribution of the lubricating oil in the helical groove 301 is more uniform, which is conducive to improving the uniformity of the lubrication of the roller 3 and the eccentric part 2 in the axial direction.

[0057] On the other hand, the present application also provides an air conditioner comprising the roller compressor.

[0058] The assembly process of the rolling compressor of the air conditioner is generally as follows: the upper flange 4 is pre-tightened on the cylinder 7, the long shaft of the crankshaft 1 penetrates into the inner circle of the upper flange 4, the eccentric part 2 is arranged in the inner circle of the cylinder 7, and the rolling part 3 is sleeved on the eccentric part 2 of the crankshaft 1 and matched with the outer circle surface of the eccentric part 2. At this time, the crankshaft 1 is manually rotated, the rolling part 3 is driven by the eccentric part 2 to rotate in the compression cavity of the cylinder 7. The gap piece is used to check the gap of the rolling part 3 at each place and the inner circle of the cylinder 7, the upper flange 4 is gently knocked, the gap of each angle rolling part 3 and the cylinder 7 is adjusted, and the design requirement is reached. After adjustment, the inner circle of the lower flange 5 penetrates into the short shaft of the crankshaft 1, the lower flange 5 is locked at the end surface of the cylinder 7 through the screw, and the pump body assembly process is completed.

[0059] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rolling compressor, characterized by, The utility model relates to a roller compressor, comprising: a crankshaft (1) provided with an eccentric part (2); a roller (3) sleeved on the eccentric part (2), the roller (3) is formed with an inner circular surface, the inner circular surface is provided with a spiral groove (301), the spiral groove (301) extends to both axial ends of the roller (3); the spiral groove (301) has the same rotation direction as the crankshaft (1) from top to bottom; the opening area of the spiral groove (301) on the upper end surface of the roller (3) is greater than that on the lower end surface of the roller (3).

2. The rolling compressor of claim 1, wherein, The flow area of the spiral groove (301) gradually decreases from top to bottom.

3. The rolling compressor of claim 1, wherein, The minimum flow area of the spiral groove (301) is S, and the economic rotation speed of the crankshaft (1) is omega, S=fomega, f is a lubrication coefficient, 0.001<=f<=0.

002.

4. The rolling compressor of claim 1, wherein, The radial depth of the spiral groove (301) is h1, and the single-side thickness of the roller (3) is h2, then 0.4h2<=h1<=0.6h2.

5. The rolling compressor of claim 1, wherein, The pitch of the spiral groove (301) is P, and the axial height of the roller (3) is h3, then 0.2h3<=P<=0.4h3.

6. The rolling compressor of claim 4, wherein, The pitch of the spiral groove (301) is P, and the inner surface of the roller (3) surrounds an inner circular hole, the diameter of the inner circular hole is D, when h1>=0.3D, 0.5h1<=P<=0.7h1; when h1<0.3D, P=0.4h1.

7. The rolling compressor of claim 1, wherein, A plurality of grooves are formed on the inner surface of the spiral groove (301).

8. The rolling compressor of claim 7, wherein, The plurality of grooves are distributed more on the top and less on the bottom in the spiral groove (301).

9. An air conditioner characterized by comprising: The utility model relates to a roller compressor, comprising: a crankshaft (1) provided with an eccentric part (2); a roller (3) sleeved on the eccentric part (2), the roller (3) is formed with an inner circular surface, the inner circular surface is provided with a spiral groove (301), the spiral groove (301) extends to both axial ends of the roller (3); the spiral groove (301) has the same rotation direction as the crankshaft (1) from top to bottom; the opening area of the spiral groove (301) on the upper end surface of the roller (3) is greater than that on the lower end surface of the roller (3). The flow area of the spiral groove (301) gradually decreases from top to bottom. The minimum flow area of the spiral groove (301) is S, and the economic rotation speed of the crankshaft (1) is omega, S=fomega, f is a lubrication coefficient, 0.001<=f<=0.

002. The radial depth of the spiral groove (301) is h1, and the single-side thickness of the roller (3) is h2, then 0.4h2<=h1<=0.6h2. The pitch of the spiral groove (301) is P, and the axial height of the roller (3) is h3, then 0.2h3<=P<=0.4h3. The pitch of the spiral groove (301) is P, and the inner surface of the roller (3) surrounds an inner circular hole, the diameter of the inner circular hole is D, when h1>=0.3D, 0.5h1<=P<=0.7h1; when h1<0.3D, P=0.4h1. A plurality of grooves are formed on the inner surface of the spiral groove (301). The plurality of grooves are distributed more on the top and less on the bottom in the spiral groove (301). The utility model relates to a roller compressor, comprising: a crankshaft (1) provided with an eccentric part (2); a roller (3) sleeved on the eccentric part (2), the roller (3) is formed with an inner circular surface, the inner circular surface is provided with a spiral groove (301), the spiral groove (301) extends to both axial ends of the roller (3); the spiral groove (301) has the same rotation direction as the crankshaft (1) from top to bottom; the opening area of the spiral groove (301) on the upper end surface of the roller (3) is greater than that on the lower end surface of the roller (3). The flow area of the spiral groove (301) gradually decreases from top to bottom. The minimum flow area of the spiral groove (301) is S, and the

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