Crankshaft and Compressor

Abstract

The present invention provides a crankshaft and a compressor, relating to the field of compressors, and solves the problem of too long preheating time of the refrigerating oil in the compressor. The crankshaft includes a long shaft and a short shaft with an eccentric structure, and there is a receiving portion on the short shaft; the long shaft is rotatably arranged and there is a pushing component on the long shaft; the pushing component is used to abut against the receiving portion when the long shaft rotates forward to drive the short shaft to drive the eccentric structure to rotate, and is used to separate from the receiving portion when the long shaft rotates reversely to block the power transmission to the short shaft; the compressor includes this crankshaft, the motor is connected to the long shaft, and the roller is sleeved on the eccentric structure. In the present invention, the long shaft can rotate forward and backward. The rapid reverse operation of the long shaft brings a large amount of heat, accelerating the preheating of the refrigerating oil before the compressor works normally; the above-mentioned crankshaft can switch between the preheating mode and the normal working mode according to the rotation direction, and can avoid the pump body damage caused by the sudden reverse rotation of the compressor and the pump body damage during the preheating process of the refrigerant and the refrigerating oil.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and more particularly to a crankshaft and a compressor. Background Art

[0002] In an existing rotary compressor, the motor rotor drives the crankshaft of the pump body to rotate together. When the crankshaft rotates, it drives the roller sleeved on its eccentric structure to perform eccentric circular motion in the cylinder, so that the compressor pump body works normally. However, the existing rotary compressors usually only support rotation in one direction. According to different application scenarios, after the air-conditioning system is turned on, the compressor always needs to be preheated by power-on first, so that the motor heat is conducted to the pump body, and the refrigerating oil in the pump body evaporates, to avoid directly compressing the liquid refrigerating oil and liquid refrigerant in the pump body when the compressor runs directly at startup, which may cause liquid impact damage to the pump body parts. This defect is particularly obvious in heat pump heating - when the outdoor temperature is relatively low, the refrigerating oil and refrigerant liquefy and deposit in the pump body after the compressor stops working.

[0003] The applicant of the present invention has found that the existing technology has at least the following technical problems: in some special and harsh environments (such as heating in polar regions), if the compressor runs too fast at this time, the pump body will be damaged. Therefore, the process of preheating the refrigerating oil of the traditional compressor is long, and it can only run at a low speed. Summary of the Invention

[0004] The purpose of the present invention is to provide a crankshaft and a compressor to solve the technical problem of too long preheating time of the refrigerating oil of the compressor before the air-conditioning system is turned on in the existing technology; the preferred technical solutions provided by the present invention can produce many technical effects, which will be elaborated below.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The crankshaft provided by the present invention includes a long shaft and a short shaft with an eccentric structure, wherein:

[0007] There is a receiving portion on the short shaft;

[0008] The long shaft is rotatably arranged and there is a pushing component on the long shaft;

[0009] The pushing component is used to abut against the receiving portion when the long shaft rotates forward to drive the short shaft to drive the eccentric structure to rotate, and is used to separate from the receiving portion when the long shaft rotates backward to block the power transmission to the short shaft.

[0010] Preferably, the receiving portion includes at least two arc-shaped grooves, and all the connected arc-shaped grooves define a rotating cavity for the pushing component to rotate reversely therein and a step for abutting against the forward-rotating pushing component.

[0011] Preferably, all the arc-shaped grooves are connected in a radial offset manner.

[0012] Preferably, the pushing component includes a convex part and a rotating block connected to each other, wherein:

[0013] The shape of the convex part is adapted to the rotating cavity; the rotating block is used to abut against the receiving part when rotating forward with the convex part, and is used to rotate along the inner wall of the rotating cavity when rotating backward with the convex part.

[0014] Preferably, the outer diameter of the convex part is not greater than the shortest distance between two relatively arranged steps.

[0015] Preferably, the receiving part includes two semi-circular grooves connected in a radial offset manner, and the convex part is an S-shaped structure arranged at the end of the long axis.

[0016] Preferably, the S-shaped convex part, the long axis and the rotating cavity are coaxially arranged.

[0017] Preferably, both ends of the S-shaped convex part are connected with the rotating blocks used to cooperate with the corresponding steps.

[0018] Preferably, there is an elastic part between the convex part and the rotating block, and the elastic part is used to pull the rotating block when the rotation direction of the long axis changes so that the convex part can push or pull the rotating block to rotate.

[0019] Preferably, there is a shaft hole at the eccentric position of the end of the long axis, there is a rotating shaft on the rotating block used to connect with the shaft hole, and the rotating block can rotate at the end of the long axis with the rotating shaft as the axis.

[0020] Preferably, the rotating shaft is arranged opposite to the end of the rotating block used to abut against the step.

[0021] Preferably, oil through holes are arranged on the long axis and the short axis and are communicated with each other.

[0022] The present invention also provides a compressor, including the above-mentioned crankshaft, an electric motor is connected to the long axis, and a roller is sleeved on the eccentric structure.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The crankshaft provided by the present invention has a normal working mode and a preheating mode. In the normal working mode, when the long shaft rotates forward, it abuts against the receiving portion on the short shaft through the pushing component to transmit power; in the preheating mode, when the long shaft rotates forward and backward, the pushing component is separated from the receiving portion on the short shaft to block power transmission, and the pump body does not work. At this time, the motor can drive the long shaft to rotate rapidly in the reverse direction to generate a large amount of heat, so as to accelerate the preheating of the refrigeration oil before the compressor works properly. The above crankshaft can switch different working modes according to the rotation direction, and can also avoid the pump body damage caused by the sudden reverse rotation of the traditional compressor and the pump body damage during the preheating process of the refrigerant and refrigeration oil.

[0025] 2. The compressor provided by the present invention can realize the opening and closing of power transmission according to the rotation direction of the compressor motor due to the above crankshaft, prevent the refrigeration oil of the compressor from being preheated for too long before starting, and avoid the pump body damage caused by the preheating of the refrigeration oil process or the sudden reverse rotation of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a three-dimensional structural schematic diagram of the long shaft;

[0028] Figure 2 It is an end structural schematic diagram of the long shaft;

[0029] Figure 3 It is a three-dimensional structural schematic diagram of the short shaft;

[0030] Figure 4 It is an end structural schematic diagram of the short shaft;

[0031] Figure 5 It is a structural schematic diagram of the rotating block;

[0032] Figure 6 It is an assembly structural schematic diagram of the crankshaft;

[0033] Figure 7 It is a structural schematic diagram of an embodiment of the elastic part;

[0034] Figure 8 It is a structural schematic diagram of the long shaft providing power to the short shaft;

[0035] Figure 9 It is a schematic diagram of position A where the long shaft does not provide power;

[0036] Figure 10Schematic diagram of position B where the long axis does not provide power.

[0037] In the figure: 1. Long axis; 101. Shaft hole; 102. First fixing hole; 11. Convex part; 12. Rotating block; 121. Rotating shaft fixing hole; 122. Second fixing hole; 13. Elastic part; 14. Rotating shaft.

[0038] 2. Short axis; 21. Rotating cavity; 22. Step.

[0039] 3. Eccentric structure.

[0040] 4. Oil through hole. Detailed implementation mode

[0041] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope protected by the present invention.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0043] Embodiment 1

[0044] This embodiment provides a crankshaft. As shown in Figures 1-10 , this crankshaft includes a long axis 1 and a short axis 2 with an eccentric structure 3, where:

[0045] There is a receiving part on the short axis 2; the long axis 1 is rotatably arranged and there is a pushing component on the long axis 1;

[0046] The pushing component is used to abut against the receiving part when the long axis 1 rotates forward to drive the short axis 2 to drive the eccentric structure 3 to rotate, and is used to separate from the receiving part when the long axis 1 rotates reversely to block the power transmission to the short axis 2.

[0047] Specifically, the above eccentric structure 3 can be an eccentric cylindrical structure arranged eccentrically with respect to the short shaft 2. When the above crankshaft is assembled in the compressor, the rotor of the motor can be connected to the long shaft 1 and drive the long shaft 1 to rotate forward or backward. The roller (piston) is sleeved on the eccentric structure 3 of the short shaft 2.

[0048] Among them, the above "forward" and "backward" refer to two opposite directions specified. For example, when the clockwise direction is specified as the forward direction, the counterclockwise direction is the backward direction. See Figures 8-10 As shown in, in this embodiment, the clockwise direction is specified as the forward direction, and the counterclockwise direction is the backward direction, and this is used as an example for illustration.

[0049] The long shaft 1 in this embodiment can be rotated in two directions under the drive of the motor, and has a normal working mode and a preheating mode. In the normal working mode, the long shaft 1 rotates forward and transmits power by abutting against the receiving portion on the short shaft 2 through the pushing component; in the preheating mode, when the long shaft 1 rotates forward and backward, the pushing component is separated from the receiving portion on the short shaft 2 to block the power transmission, and the pump body does not work. At this time, a large amount of heat can be brought by driving the long shaft 1 to rotate rapidly in the reverse direction by the motor, so as to accelerate the preheating of the refrigeration oil before the compressor works normally.

[0050] The above crankshaft can switch different working modes according to the rotation direction, and can also avoid the pump body damage caused by the sudden reverse rotation of the traditional compressor and the pump body damage during the preheating process of the refrigerant and the refrigeration oil.

[0051] As an optional implementation manner, see Figure 3 and Figure 4 As shown in, the receiving portion in this embodiment includes at least two arc-shaped grooves. All the connected arc-shaped grooves define a rotation cavity 21 for the pushing component to rotate reversely therein and a step 22 for abutting against the pushing component rotating forward.

[0052] See Figure 6 As shown in, the above structural manner of splicing two or more arc-shaped grooves to simultaneously define the rotation cavity 21 and the step 22 is convenient for assembling with the pushing component of the long shaft 1, and the structure is simple and stable.

[0053] Specifically, see Figure 3 and Figure 4 As shown in, all the arc-shaped grooves are connected in a radial offset manner. In other words, each arc-shaped groove is eccentrically arranged and interconnected.

[0054] When the arc-shaped grooves are connected in the above manner, as Figure 4As shown in the figure, the mating structure can form a step 22 at the connection, and the number of the steps 22 is equal to the number of the arc-shaped grooves; the step 22 is used to cooperate with the pushing component to transmit power. At the same time, the arc-shaped grooves are connected in the above manner to form a communicating rotating cavity 21, and the rotating cavity 21 allows the pushing component of the long shaft 1 to freely rotate reversely therein.

[0055] As an alternative implementation, this embodiment provides a specific implementation of the pushing component. Refer to Figure 1 , Figure 2 and Figure 5 As shown, the pushing component includes a convex part 11 and a rotating block 12 which are connected, where:

[0056] The shape of the convex part 11 is adapted to the rotating cavity 21; the rotating block 12 is used to abut against the receiving part when rotating forward with the convex part 11, and is used to rotate along the inner wall of the rotating cavity 21 when rotating reversely with the convex part 11.

[0057] Specifically, the convex part 11 is arranged at one end of the long shaft 1 for assembling with the short shaft 2. Since the rotating cavity 21 defined by the multiple arc-shaped grooves can satisfy the free reverse (counterclockwise) rotation of the convex part 11 therein, therefore, the convex part 11 cannot directly abut against the step 22 to transmit power, and a rotating block 12 needs to be additionally provided to transmit the power of the long shaft 1 to the short shaft 2 (when rotating clockwise).

[0058] The function of the rotating block 12 is: when the long shaft 1 rotates counterclockwise as Figure 9 and Figure 10 , the arrow direction in the figure represents the rotation direction of the long shaft 1. One end of the rotating block 12 is fixed on the long shaft 1, and the other end will generate friction in the rotating cavity 21, but the friction force at this time is not enough to drive the short shaft 2, and the rotating block 12 rotates along the inner wall of the rotating cavity 21 and does not interfere with the reverse free rotation of the convex part 11 in the rotating cavity 21, that is, the rotating block 12 does not interfere with the rotation of the long shaft 1. When rotating clockwise as Figure 8 , the arrow direction in the figure represents the rotation direction of the long shaft 1. The power is transmitted from the long shaft 1 to the rotating block 12. The convex part 11 of the long shaft 1 pushes the rotating block 12, and the rotating block 12 abuts against the step 22 of the short shaft 2, and the short shaft 2 can be driven.

[0059] In order to enable the convex part 11 to freely rotate reversely in the rotating cavity 21, as an alternative implementation, refer to Figures 8-10 As shown, the outer diameter of the convex part 11 is not greater than the shortest distance between the two relatively arranged steps 22.

[0060] When the two end portions with the longest relative spacing of the convex portion 11 are reversely rotated to between the two steps 22 arranged oppositely, the convex portion 11 and the rotating block 12 do not abut against the steps 22. However, since the rotating cavity 21 is restricted by the position of the steps 22 at this time and the distance is at the minimum position, when the outer diameter of the convex portion 11 is less than this shortest distance, it can perform multiple turns of rapid rotation in the rotating cavity 21.

[0061] For the sake of structural simplicity, as an alternative embodiment, refer to Figure 3 and Figure 4 As shown, the receiving portion on the short shaft 2 includes two semi-circular grooves connected in a radially offset manner, and the convex portion 11 of the long shaft 1 is an S-shaped structure provided at the end of the long shaft 1.

[0062] In this embodiment, the two semi-circular grooves are connected in a radially offset manner to define a rotating cavity 21 for the pushing component to reversely rotate therein and a step 22 for abutting against the forward-rotating pushing component. To be adapted to the above-mentioned rotating cavity 21 and step 22, the convex portion 11 in this embodiment has an S-shaped structure, as Figures 8-10 shown.

[0063] The receiving portion with the above structure and the convex portion 11 in the pushing component are simple in structure and can be adapted to achieve different working modes during commutation rotation.

[0064] As an alternative embodiment, refer to Figures 8-10 shown. The convex portion 11 with an S-shaped structure, the long shaft 1 and the rotating cavity 21 are coaxially arranged.

[0065] The above-mentioned components are arranged with their central axes collinear, which can facilitate the stable rotation of the convex portion 11 on the long shaft 1 in the rotating cavity 21 of the short shaft 2 to achieve the preheating mode and the normal working mode.

[0066] As an alternative embodiment, as Figures 8-10 shown. In this embodiment, both ends of the convex portion 11 with an S-shaped structure are connected with rotating blocks 12 for cooperating with the corresponding steps 22.

[0067] Both end portions of the convex portion 11 with an S-shaped structure cooperate with the corresponding rotating blocks 12 respectively to abut against the two corresponding steps 22 to transmit power when the long shaft 1 rotates forward (clockwise direction in the figure). The above two cooperating structures facilitate the stable cooperation between the long shaft 1 and the short shaft 2 to achieve the smooth rotation of the pump body in the normal working mode.

[0068] For the sake of facilitating the rotating block 12 to rotate following the convex portion 11, as an alternative embodiment, refer to Figures 8-10 shown in. There is an elastic portion 13 between the convex portion 11 and the rotating block 12. The elastic portion 13 is used to pull the rotating block 12 when the rotation direction of the long shaft 1 is changed so that the convex portion 11 can push or pull the rotating block 12 to rotate.

[0069] The function of the above elastic part 13 is as follows: when the long shaft 1 rotates counterclockwise, the convex part 11 pulls the rotating block 12 through the elastic part 13, and one end of the rotating block 12 moves along the inner wall of the rotating cavity 21; when the long shaft 1 rotates from counterclockwise to clockwise, the rotating block 12 can be pulled back and attached to one end of the S-shaped convex part 11 of the long shaft 1 to prevent the S-shaped convex part 11 of the long shaft 1 from failing to abut and push the rotating block 12.

[0070] The above elastic part 13 can be a compression spring, such as Figure 7 shown. Fixed holes two 122 and fixed hole one 102 can be respectively arranged at the corresponding positions of the rotating block 12 and the convex part 11, and both ends of the spring can be respectively fixed on the rotating block 12 and the convex part 11 by cooperating with a pin.

[0071] In order to enable the rotating block 12 to rotate on the long shaft 1, as an optional implementation manner, refer to Figure 1 and Figure 5 shown. There is a shaft hole 101 at the eccentric position at the end of the long shaft 1, and there is a rotating shaft 14 on the rotating block 12 for connecting with the shaft hole 101, and the rotating block 12 can rotate at the end of the long shaft 1 with the rotating shaft 14 as the axis.

[0072] Specifically, there is a rotating shaft fixing hole 121 arranged corresponding to the axis on the rotating block 12, such as Figure 5 shown. The rotating shaft 14 can adopt a pin shaft. After assembly, as Figure 8 shown, the rotating block 12 is located at the end of the long shaft 1 and rotates with the rotating shaft 14 as the axis under the pulling or pushing of the convex part 11.

[0073] As an optional implementation manner, refer to Figure 8 shown. The rotating shaft 14 is arranged opposite to one end of the rotating block 12 for abutting against the step 22.

[0074] The above setting method can enable the distance between one end of the rotating block 12 for abutting against the step 22 and the inner wall of the rotating cavity 21 to be adjusted during the rotation process. Combining Figure 8 、 Figure 9 and Figure 10 shown, when rotating forward, the end of the rotating shaft 14 can abut against the step 22 to transmit power; when rotating backward, the end of the rotating shaft 14 gets closer and closer to the inner wall of the cavity but will not abut, so as to prevent interfering with the rotation of the long shaft 1.

[0075] As an optional implementation manner, in order to supply refrigerating oil for lubricating the pump body parts, oil through holes 4 are arranged on the long shaft 1 and the short shaft 2 and are communicated with each other.

[0076] Embodiment 2

[0077] This embodiment provides a compressor, which is characterized by including the above-mentioned crankshaft, the motor is connected to the long shaft 1, and the roller is sleeved on the eccentric structure 3.

[0078] In the compressor of this embodiment, there are a preheating mode and a normal working mode during operation. Preheating mode: When the compressor motor rotates in reverse (counterclockwise), it drives the long shaft 1 and the convex part 11 and the rotating block 12 thereon to rotate. The rotating block 12 rotates a certain angle around the rotating shaft 14 and does not interfere with the rotation of the long shaft 1 of the crankshaft (at this time, the elastic part 13 is in a stretched state). At this time, the long shaft 1 does not provide power to the short shaft 2 (such as Figure 9 , Figure 10 ), and only the motor and the long shaft 1 in the compressor rotate. In this mode, the pump body of the compressor does not rotate, and the pump body will not be damaged due to the refrigerating oil and the liquid refrigerant. The motor can rotate rapidly to generate a large amount of heat, which accelerates the preheating of the refrigerating oil and vaporizes the liquid refrigerant at the same time, avoiding liquid hammer damage caused by the compressor starting with liquid.

[0079] Normal working mode: After the compressor is fully preheated by reverse rotation, the motor is controlled to rotate forward (clockwise) through the control program. The rotating block 12 is pulled back by the elastic force of the elastic part 13, abuts against the long shaft 1 (convex part 11) on one side and abuts against the short shaft 2 (step 22) on the other side (such as Figure 8 ), at this time the long shaft 1 can provide power to the short shaft 2, and the compressor works normally, and liquid startup is avoided.

[0080] In the description of this specification, specific features, structures or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0081] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A crankshaft, characterized in that, It includes a long axis and a short axis with an eccentric structure, where: There is a receiving portion on the short axis; The long axis is rotatably arranged and there is a pushing component on the long axis; The pushing component is used to abut against the receiving portion when the long axis rotates forward to drive the short axis to drive the eccentric structure to rotate, and is used to separate from the receiving portion when the long axis rotates backward to block the power transmission to the short axis; The receiving portion includes at least two arc-shaped grooves, and all the connected arc-shaped grooves define a rotating cavity for the pushing component to rotate reversely inside and a step for abutting against the forward-rotating pushing component; The pushing component includes a connected convex portion and a rotating block, where: the shape of the convex portion is adapted to the rotating cavity; the rotating block is used to abut against the receiving portion when rotating forward with the convex portion, and is used to rotate along the inner wall of the rotating cavity when rotating backward with the convex portion.

2. The crankshaft according to claim 1, wherein, All the arc-shaped grooves are connected in a radial offset manner.

3. The crankshaft according to claim 1, characterized in that, The outer diameter of the convex portion is not greater than the shortest distance between two relatively arranged steps.

4. The crankshaft according to claim 1 or 3, characterized in that The receiving portion includes two semi-circular grooves connected in a radial offset manner, and the convex portion is an S-shaped structure arranged at the end of the long axis.

5. The crankshaft according to claim 4, characterized in that, The convex portion of the S-shaped structure, the long axis and the rotating cavity are coaxially arranged.

6. The crankshaft according to claim 4, characterized in that, Both ends of the convex portion of the S-shaped structure are connected with the rotating blocks for cooperating with the corresponding steps.

7. The crankshaft according to claim 1, wherein, There is an elastic portion between the convex portion and the rotating block, and the elastic portion is used to pull the rotating block when the rotation direction of the long axis changes so that the convex portion pushes or pulls the rotating block to rotate.

8. The crankshaft according to claim 1 or 7, characterized in that, There is a shaft hole at the eccentric position of the end of the long axis, and there is a rotating shaft on the rotating block for connecting with the shaft hole, and the rotating block can rotate at the end of the long axis with the rotating shaft as the axis.

9. The crankshaft according to claim 8, characterized in that, The rotating shaft is arranged opposite to the end of the rotating block for abutting against the step.

10. The crankshaft according to claim 1, characterized in that, There are communicating oil holes provided on the long axis and the short axis.

11. A compressor, characterized in that, It includes the crankshaft according to any one of claims 1-10, the motor is connected to the long axis, and the roller is sleeved on the eccentric structure.

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