Crankshaft assembly, pump body assembly and compressor

Abstract

The present application provides a crankshaft assembly, a pump body assembly and a compressor. The crankshaft assembly includes a crankshaft, which at least includes an upper shaft and a lower shaft that are axially stacked; eccentric portions are provided on both the upper shaft and the lower shaft; a movable member capable of moving; when the movable member is in a first position, the movable member connects the upper shaft and the lower shaft, so that the upper shaft and the lower shaft can rotate synchronously; when the movable member is in a second position, the upper shaft and the lower shaft are in a separated state. In the present application, the upper shaft and the lower shaft are connected or separated by the movable member, so that the upper shaft and the lower shaft rotate synchronously or one of them rotates independently, thereby achieving the variable displacement function of a double cylinder, avoiding the situation that the unloaded cylinder is still idling during single-cylinder operation, reducing the frictional power consumption of the compressor, and improving the energy efficiency of the compressor.

Description

Technical Field

[0001] This application belongs to the technical field of compressors, and particularly relates to a crankshaft assembly, a pump body assembly, and a compressor. Background Art

[0002] Currently, the displacement of rotary compressors is getting larger and larger. However, under light working conditions and low loads, the compressor has the problem of low efficiency. In existing double-rotor double-cylinder variable-capacity compressors, basically, the sliding vane is controlled to disengage from the roller of the variable-capacity chamber, allowing the roller to rotate idly to achieve the purpose of unloading.

[0003] This commonly used unloading technology causes the non-working variable-capacity chamber to still be in a rotating state. This will make the motor drive an extra load, increasing the power of the compressor. And as the variable-capacity chamber continues to rotate idly, the outer surface of the roller inside it keeps rubbing against the inner circular surface of the cylinder, and the lower thrust surface of the crankshaft keeps rubbing against the working surface of the lower flange. These frictional losses cannot be avoided along with the unloading of the work, resulting in excessive part wear and frictional power consumption.

[0004] Therefore, how to redesign the variable-capacity method of a double-rotor double-cylinder compressor to avoid the extra losses caused by the idling of the unloading cylinder, thereby improving the energy efficiency of the compressor, is an important technical problem that those skilled in the art need to solve currently. Summary of the Invention

[0005] Therefore, this application provides a crankshaft assembly, a pump body assembly, and a compressor, which can solve the problem that in the prior art, the variable-capacity method of a double-cylinder compressor causes extra losses due to the idling of the unloading cylinder.

[0006] To solve the above problems, this application provides a crankshaft assembly, including:

[0007] A crankshaft, at least including an upper shaft and a lower shaft stacked axially; eccentric parts are provided on both the upper shaft and the lower shaft;

[0008] A movable part, capable of moving; when the movable part is in the first position, the movable part connects the upper shaft and the lower shaft, so that the upper shaft and the lower shaft can rotate synchronously; when the movable part is in the second position, the upper shaft and the lower shaft are in a separated state.

[0009] Optionally, the crankshaft assembly further includes a driving part, capable of driving the movable part to move.

[0010] Optionally, the movable part includes a key. Notches are provided on the side walls of the lower part of the upper shaft and the upper part of the lower shaft, and the two notches are butted to form a groove; the key is inserted into or removed from the groove movably along the radial direction of the crankshaft.

[0011] Optionally, the material of the key includes a permanent magnetic material, and the driving member for driving the key to move includes an electromagnet.

[0012] According to another aspect of the present application, a pump body assembly is provided, including the crankshaft assembly as described above.

[0013] Optionally, the pump body assembly further includes a partition member, the partition member includes a shaft hole; the superposition of the upper shaft and the lower shaft is located in the shaft hole; the movable member is movably arranged on the partition member.

[0014] Optionally, the movable member includes a key. When notches are provided on the upper shaft and the lower shaft, key grooves are provided on the inner circumferential surface of the partition member; the first position includes the key being inserted into the groove, and the second position includes the key being located in the key groove.

[0015] Optionally, an arc transition is provided between the side wall of the key groove along the rotation direction of the crankshaft and the circumferential surface of the shaft hole.

[0016] Optionally, the partition member further has a mounting hole for assembling an electromagnet, and the electromagnet acts on the key containing the permanent magnet material.

[0017] According to another aspect of the present application, a compressor is provided, including the crankshaft assembly as described above or the pump body assembly as described above.

[0018] A crankshaft assembly provided by the present application includes: a crankshaft, at least including an upper shaft and a lower shaft that are axially superposed; eccentric portions are provided on both the upper shaft and the lower shaft; a movable member capable of moving; when the movable member is in the first position, the movable member connects the upper shaft and the lower shaft, so that the upper shaft and the lower shaft can rotate synchronously; when the movable member is in the second position, the upper shaft and the lower shaft are in a separated state.

[0019] In the present application, the upper shaft and the lower shaft are connected or separated by the movable member, so that the upper shaft and the lower shaft rotate synchronously or one of them rotates alone, thus achieving the function of variable displacement of a double cylinder, avoiding the situation that the unloaded cylinder is still idling during single-cylinder operation, reducing the frictional power consumption of the compressor, and improving the energy efficiency of the compressor. Description of the Drawings

[0020] Figure 1 It is a diagram showing the unloading state of the variable displacement chamber of the compressor according to the embodiment of the present application;

[0021] Figure 2 It is a diagram showing the working state of the variable displacement chamber of the compressor according to the embodiment of the present application;

[0022] Figure 3 It is an exploded structure diagram of the crankshaft assembly according to the embodiment of the present application;

[0023] Figure 4 Schematic structural diagram of the partition member according to an embodiment of the present application;

[0024] Figure 5 Cross-sectional view of the partition member according to an embodiment of the present application.

[0025] The reference numerals are shown as:

[0026] 1. Upper shaft; 11. Upper eccentric part; 2. Lower shaft; 21. Lower eccentric part; 3. Partition member; 31. Key; 32. Electromagnet; 33. Mounting hole; 34. Keyway; 341. Transition arc surface. Detailed implementation manners

[0027] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device comprising a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0029] Referring jointly to Figures 1 to 5 As shown, according to an embodiment of the present application, a crankshaft assembly includes:

[0030] A crankshaft, at least including an upper shaft 1 and a lower shaft 2 stacked axially; both the upper shaft 1 and the lower shaft 2 are provided with eccentric parts;

[0031] A movable member that can move; when the movable member is in the first position, the movable member connects the upper shaft 1 and the lower shaft 2, so that the upper shaft 1 and the lower shaft 2 can rotate synchronously; when the movable member is in the second position, the upper shaft 1 and the lower shaft 2 are in a separated state.

[0032] In this application, the upper shaft 1 and the lower shaft 2 are connected or separated by a movable member, so that the upper shaft 1 and the lower shaft 2 rotate synchronously or one of them rotates independently. Since the upper shaft 1 is provided with an upper eccentric portion 11 and the lower shaft 2 is provided with a lower eccentric portion 21, rollers and cylinders can be sleeved thereon, thus achieving the double-cylinder variable capacity function, avoiding the situation that the unloading cylinder is still idling when the single cylinder is working, reducing the frictional power consumption of the compressor, and improving the energy efficiency of the compressor.

[0033] As Figure 1 and 2 shown, when the movable member is in different positions, the upper shaft 1 and the lower shaft 2 rotate synchronously, and both cylinders operate for compression; when the upper shaft 1 and the lower shaft 2 are separated, only one rotates, that is, one cylinder is in the operating compression state and the other cylinder is in the unloading and non-rotating state. Therefore, no idling will occur, and there will be no friction between the outer surface of the roller inside and the inner circular surface of the cylinder, and between the lower thrust surface of the crankshaft and the working surface of the lower flange, avoiding these frictional losses and improving the energy efficiency of the compressor.

[0034] In some embodiments, the crankshaft assembly further includes a driving member capable of driving the movable member to move.

[0035] Using a driving member to drive the movement of the movable member is convenient for regulation and has a high degree of automation.

[0036] In some embodiments, the movable member includes a key 31. Notches are provided on the side walls of the lower part of the upper shaft 1 and the upper part of the lower shaft 2, and the two notches are butted to form a groove; the key 31 is movably inserted into or removed from the groove along the radial direction of the crankshaft.

[0037] The movable member is in the form of a key 31 and is inserted into the groove on the side wall at the superposition of the upper shaft 1 and the lower shaft 2 in the radial direction, which can play a role in connecting the synchronous rotation of the upper shaft 1 and the lower shaft 2; when the key 31 is pulled out of the groove, the upper shaft 1 and the lower shaft 2 are in a separated state. If the motor assembly is provided on the upper shaft 1, the upper shaft 1 continues to rotate while the lower shaft 2 stops rotating and is in the unloading state, reducing the power consumption of the motor.

[0038] In practical applications, a movable member that moves axially along the crankshaft can also be provided. For example, the movable member is arranged in the lower shaft 2 and can move axially. An axial slot is provided corresponding to the upper shaft 1, and the movable member is partially inserted into the slot, so that the upper shaft 1 and the lower shaft 2 rotate synchronously. When leaving the slot, the upper shaft 1 and the lower shaft 2 are separated.

[0039] In some embodiments, the material of the key 31 includes a permanent magnetic material, and the driving member for driving the key 31 to move includes an electromagnet 32.

[0040] By inserting the key 31 in the radial direction, the key 31 is made of a permanent magnet material or contains a part of the permanent magnet material, and the driving member is an electromagnet 32. The direction of the current of the electromagnet 32 can be changed to change the attraction or repulsion of the electromagnet 32 on the key 31, so as to achieve the radial movement of the key 31.

[0041] According to another aspect of the present application, a pump body assembly is provided, including the crankshaft assembly as described above.

[0042] In some embodiments, the pump body assembly further includes a partition member 3, and the partition member 3 includes a shaft hole; the superposition of the upper shaft 1 and the lower shaft 2 is located in the shaft hole; the movable member is movably arranged on the partition.

[0043] Since the crankshaft is divided into a segmented structure, a partition member 3 is provided at the superposition of the upper shaft 1 and the lower shaft 2 to support the upper shaft 1 and the lower shaft 2. At the same time, the movable member is arranged on the partition member 3, and the partition member 3 provides the installation of the movable member without adding other installation structures.

[0044] In some embodiments, the movable member includes a key 31. When there are notches on the upper shaft 1 and the lower shaft 2, a key groove 34 is provided on the inner circumferential surface of the partition member 3; the first position includes the key 31 inserted into the groove, and the second position includes the key 31 located in the key groove 34.

[0045] A key groove 34 is provided on the inner circumferential surface of the shaft hole of the partition member 3 for the upper shaft 1. The key 31 can be replaced between the key groove 34 and the groove to realize the connection or separation of the upper shaft 1 and the lower shaft 2.

[0046] In some embodiments, an arc transition is provided between the side wall of the key groove 34 along the rotation direction of the crankshaft and the circumferential surface of the shaft hole.

[0047] When the electromagnet 32 acts to insert the key 31 into the groove, to avoid the situation that the key 31 is not fully inserted into the groove, the key groove 34 and the circumferential surface of the shaft hole are set as a transition arc surface, so that the key 31 will be gradually pushed into the groove by the circumferential surface of the shaft hole; this transition arc surface can be set as an involute or a quasi-involute.

[0048] In some embodiments, the partition member 3 further has a mounting hole 33 for assembling the electromagnet 32, and the electromagnet 32 acts on the key 31 containing the permanent magnet material.

[0049] The mounting hole 33 is provided in the partition member 3 to facilitate the installation of the electromagnet and drive the movement of the key 31 containing the permanent magnet material; in actual setting, the mounting hole 33 can be communicated with the key groove 34.

[0050] According to another aspect of the present application, a compressor is provided, including the crankshaft assembly as described above or the pump body assembly as described above.

[0051] Taking a double-rotor double-cylinder variable-capacity compressor as an example, the present application will be further described in detail below.

[0052] The crankshaft is divided into upper and lower sections. The upper shaft 1 and the lower shaft 2 both have notches. The docking part of the upper shaft 1 and the lower shaft 2 forms a groove. The key 31 is a permanent magnet and has magnetism. A keyway 34 and an installation hole 33 for the electromagnet 32 are provided on the partition member 3.

[0053] When the compressor operates with two cylinders, a positive current is applied to the electromagnet 32. The polarity of the electromagnet 32 is the same as that of the key 31. According to the principle of magnetic field repulsion between the same poles, the key 31 is pushed out of the keyway 34 into the groove, connecting the upper shaft 1 and the lower shaft 2. The torque of the upper shaft 1 is transmitted to the lower shaft 2 through the key 31, enabling the two cylinders of the compressor to work simultaneously.

[0054] Regarding the process of the key 31 being squeezed into the groove: Under the action of magnetic force, the key 31 moves radially until it collides with the crankshaft. If the grooves of the upper and lower crankshafts do not match at this time, the key 31 will continuously rub against the wall surface of the crankshaft. Once the grooves of the upper and lower shafts match, the key 31 can be squeezed into the groove under the action of magnetic force. After the key 31 is slightly squeezed into the groove, the key 31 will rotate with the crankshaft. At first, the key 31 may not be completely squeezed in, but an involute-like arc surface is provided on the side wall of the keyway 34 in the partition member 3. So that during the rotation process of the key 31, under the action of the supporting force of the inner wall of the keyway 34, the key 31 is slowly pushed completely into the groove, thus ensuring that the key 31 is properly squeezed in and does not affect the rotation of the crankshaft. Second, after being squeezed into the groove, the key 31 rotates at a high speed with the crankshaft and has a tendency to fly out tangentially due to centrifugal force. However, during the entire rotation cycle, due to the sufficient length of the key 31, the key 31 will always be in contact with the inner wall of the inner circle of the partition member 3, thereby obtaining the supporting force of the partition member 3 on the key 31. At this time, the key 31 is in radial force balance, and the supporting force is equal to the centrifugal force; only when the key 31 rotates to the movement channel of the keyway 34 of the partition member 3 will it briefly lose the supporting force of the partition, and at this time, the key 31 is in an unbalanced force state and has a tendency to fly out tangentially, but the key 31 will not completely fly out of the keyway 34 because only when the key 31 deviates in the radial direction is it possible to fly out of the groove. At this time, under the action of centrifugal force, the key 31 flies out tangentially and still contacts the inner wall of the partition member 3, obtaining the supporting force, and at the same time, a part of it is still stuck in the groove, connecting the upper and lower crankshafts to ensure the reliability of the movement.

[0055] When the load of the compressor is small and single-cylinder operation is required, a reverse current is applied to the electromagnet 32 to change the polarity of the electromagnet 32. At this time, through the action of attraction between opposite poles, the key 31 is sucked back into the partition member 3, disengaging from the groove on the crankshaft. At this time, the upper shaft 1 and the lower shaft 2 are separated, and only the upper cylinder of the compressor operates. In this way, by controlling the current direction of the electromagnet 32, the purpose of double-cylinder variable-capacity compression of the compressor can be achieved.

[0056] In this application, the single-cylinder operation mode and the double-cylinder operation mode of the double-cylinder variable-capacity compressor are mainly achieved by controlling the magnitude and direction of the current applied to the electromagnet 32, changing the polarity of the electromagnet 32, and controlling whether the control key 31 is combined with the groove, so as to control the connection state of the upper and lower crankshafts.

[0057] According to the Maxwell suction formula, the attractive force is equal to the repulsive force:

[0058] F = F g + F n = B g 2 S / 2μ0 + B n 2 S / 2μ0

[0059] Among them, F is the magnitude of the total magnetic force; F g is the force generated by the permanent magnet; F n is the force generated by the electromagnet; B g is the magnetic field strength generated by the permanent magnet; B n is the magnetic field strength generated by the electromagnet; S is the acting area; μ0 is a constant. And B n = μ0IN / L; where I is the current; N is the number of turns of the electromagnet coil; L is the length of the energized solenoid.

[0060] From the above two formulas, it can be seen that by controlling the magnitude and direction of the current I, the magnitude and direction of the total magnetic force F can be changed. As long as the total magnetic force F is greater than the frictional force f of the key 31 moving inside the groove, the movement of the key 31 can be controlled.

[0061] In the single-cylinder operation mode, a reverse current I is applied to the electromagnet 32, and the generated magnetic field direction is opposite to the magnetic field direction generated by the permanent magnet key 31, and the two attract each other. Since the electromagnet 32 is fixed, the key 31 is in a partially constrained state. Under the action of the total magnetic force F, the key 31 overcomes the frictional force f and approaches the electromagnet 32, and finally combines together. At the same time, the upper and lower shafts are separated, realizing the variable-capacity adjustment of the compressor while avoiding the phenomenon of the lower cylinder idling, avoiding unnecessary part wear and frictional power consumption, and improving the overall energy efficiency of the compressor.

[0062] Those skilled in the art can easily understand that, on the premise of no conflict, the above-mentioned embodiments can be freely combined and superimposed.

[0063] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present application, several improvements and variations can still be made, and these improvements and variations should also be regarded as within the protection scope of the present application.

Claims

1. A pump body assembly, characterized in that, Comprising a crankshaft assembly and a partition member (3), the crankshaft assembly comprising: A crankshaft, at least including an upper shaft (1) and a lower shaft (2) stacked axially; eccentric portions are provided on both the upper shaft (1) and the lower shaft (2); A movable member capable of moving; when the movable member is in the first position, the movable member connects the upper shaft (1) and the lower shaft (2) so that the upper shaft (1) and the lower shaft (2) can rotate synchronously; when the movable member is in the second position, the upper shaft (1) and the lower shaft (2) are in a separated state; The crankshaft assembly further includes a driving member capable of driving the movable member to move; The movable member includes a key (31), notches are provided on the side walls of the lower part of the upper shaft (1) and the upper part of the lower shaft (2), and the two notches are butted to form a groove; the key (31) is movably inserted into or removed from the groove along the radial direction of the crankshaft; The material of the key (31) includes a permanent magnetic material, and the driving member for driving the key (31) to move includes an electromagnet (32); The partition member (3) includes a shaft hole; the stacked portion of the upper shaft (1) and the lower shaft (2) is located in the shaft hole; the movable member is movably arranged on the partition member (3); A key groove (34) is provided on the inner peripheral surface of the partition member (3); the first position includes the key (31) being inserted into the groove, and the second position includes the key (31) being located in the key groove (34); An arc transition is provided between the side wall of the key groove (34) along the rotation direction of the crankshaft and the peripheral surface of the shaft hole.

2. The pump body assembly according to claim 1, wherein, An installation hole (33) for assembling the electromagnet (32) is further provided in the partition member (3), and the electromagnet (32) acts on the key (31) containing a permanent magnet material.

3. A compressor, characterized in that, Including the pump body assembly according to claim 1 or 2.

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