Compressor and refrigeration equipment

Abstract

The utility model discloses a compressor and refrigeration equipment. The compressor comprises a machine shell, a stator iron core and a rotor iron core. The stator iron core is arranged in the casing, and a central hole axially penetrates through the middle part of the stator iron core; the stator iron core is provided with a central hole, the rotor iron core is rotatably inserted in the central hole, the rotor iron core is provided with a plurality of ferrite permanent magnets, the middle part of the rotor iron core is provided with a rotating shaft which extends axially, two ends of the rotating shaft are rotatably connected to the casing, an air gap between the stator iron core and the rotor iron core is defined as P, and P is more than 0.4 mm and less than 0.7 mm. The axial length of the rotor core is defined as L1, and the L1 is larger than or equal to 85 mm and smaller than or equal to 150 mm. According to the technical scheme, the cost of the compressor is reduced by adopting the ferrite permanent magnets, and the two ends of the rotating shaft are supported, so that the operation stability of the compressor is guaranteed under the conditions of increasing the axial length of the rotor iron core and reducing the air gap.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a compressor and a refrigeration device. Background Art

[0002] The motor in the compressor is used to transport the refrigerant from the low-pressure area to the high-pressure area to promote the circulation of the refrigerant. In the related technology, the remanence of the permanent magnets on the motor is usually high, and the cost of permanent magnets with high remanence is high, which leads to a corresponding increase in the cost of the compressor. Reducing the remanence of the permanent magnets will also significantly reduce the motor power in the compressor, reducing the operating energy efficiency of the compressor. The existing means of increasing the motor power are likely to affect the operating reliability of the compressor. Utility Model Content

[0003] The main purpose of the utility model is to provide a compressor, which reduces the cost of the compressor by adopting ferrite permanent magnets, and forms supports at both ends of the rotating shaft to ensure the operating stability of the compressor while increasing the axial length of the rotor core and reducing the air gap.

[0004] Ensure the operating stability of the compressor.

[0005] To achieve the above-mentioned purpose, the compressor proposed by the utility model comprises:

[0006] chassis;

[0007] A stator core is disposed in the housing, and a center hole is axially passed through the middle of the stator core; and

[0008] A rotor core, wherein the rotor core is rotatably inserted in the center hole, the rotor core is provided with a plurality of ferrite permanent magnets, an axially extending rotating shaft is provided in the middle of the rotor core, and both ends of the rotating shaft are rotatably connected to the casing, an air gap between the stator core and the rotor core is defined as P, and P satisfies: 0.4mm<P<0.7mm, an axial length of the rotor core is defined as L1, and L1 satisfies: 85mm≤L1≤150mm.

[0009] Optionally, P satisfies: 0.4mm<P<0.55mm.

[0010] Optionally, L1 satisfies: 100mm≤L1≤140mm.

[0011] Optionally, the remanence Br of the ferrite permanent magnet (500) is defined as <0.5T.

[0012] Optionally, the axial length of the rotor core is defined as L1, the length of the rotating shaft is defined as L2, and L1 and L2 satisfy: 0.3≤L1 / L2≤0.5.

[0013] Optionally, an outer diameter of the stator core is defined as D1, an inner diameter of the stator core is defined as D2, and D1 and D2 satisfy: 0.5≤D2 / D1≤0.65.

[0014] Optionally, the axial length of the ferrite permanent magnet is consistent with the axial length of the rotor core.

[0015] Optionally, the compressor also includes a pump body, the rotor core and the pump body are respectively arranged in the upper and lower parts of the casing, the lower end of the rotating shaft is rotatably connected to the pump body through a lower bearing, and the upper end of the rotating shaft is rotatably connected to the upper part of the casing through an upper bearing.

[0016] Optionally, the outer periphery of the stator core is connected to the inner side of the casing by welding.

[0017] The utility model also provides a refrigeration device, which comprises the compressor as mentioned above.

[0018] The technical solution of the utility model configures the permanent magnets in the rotor core as ferrite permanent magnets. Compared with the rare earth permanent magnets used in the prior art, the cost of ferrite permanent magnets is lower, thereby reducing the cost of the compressor. At the same time, the air gap between the stator core and the rotor core is reduced so that the air gap P is between 0.4 mm and 0.7 mm, reducing the pressure drop effect of the air gap on the magnetic potential of the ferrite permanent magnet, which is beneficial to ensure the magnetic potential of the ferrite permanent magnet to ensure the output power of the rotor. At the same time, the axial length of the rotor core is increased so that its axial The length L1 is between 85mm and 150mm, which ensures that the saturation flux density of the rotor core is at a larger value, thereby improving the efficiency of the compressor and preventing the low remanence of the ferrite permanent magnet from affecting the power of the compressor. When the distance between the stator core and the rotor core is reduced and the axial length of the rotor core is increased, the two ends of the shaft are rotatably connected to the casing, which can accurately confine the rotor core to the center hole, prevent the rotor core from eccentrically rotating and interfering with the stator core, and avoid abnormal noise, thereby ensuring the operating stability and energy efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a schematic structural diagram of an embodiment of a compressor of the utility model;

[0021] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 for Figure 1 A schematic cross-sectional view of the compressor;

[0023] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0024] Figure 5 This is a relationship diagram between the maximum output torque of the motor and the air gap between the stator and the rotor in the compressor of the utility model;

[0025] Figure 6 This is a relationship diagram between the motor efficiency and the axial length of the rotor core in the compressor of the utility model.

[0026] Description of Figure Numbers:

[0027] Label name Label name 100 chassis 200 Stator core 300 Rotor core 400 Shaft 500 Ferrite permanent magnets 600 Upper bearing 700 Lower bearing 800 Pump body

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0032] The utility model provides a compressor.

[0033] In the embodiment of the present utility model, please refer to Figures 1 to 6 , the compressor comprises:

[0034] Housing 100;

[0035] The stator core 200 is disposed in the housing 100, and a central hole is axially passed through the middle of the stator core 200; and

[0036] The rotor core 300 is rotatably inserted in the center hole. The rotor core 300 is provided with a plurality of ferrite permanent magnets 500. An axially extending rotating shaft 400 is provided in the middle of the rotor core 300. Both ends of the rotating shaft 400 are rotatably connected to the housing 100. The air gap between the stator core 200 and the rotor core 300 is defined as P, and P satisfies: 0.4mm<P<0.7mm. The axial length of the rotor core 300 is defined as L1, and L1 satisfies: 85mm≤L1≤150mm.

[0037] The technical solution of the utility model configures the permanent magnet in the rotor core 300 as a ferrite permanent magnet 500. Compared with the rare earth permanent magnet used in the prior art, the cost of the ferrite permanent magnet 500 is lower, thereby reducing the cost of the compressor. At the same time, the air gap between the stator core 200 and the rotor core 300 is reduced so that the air gap P is between 0.4 mm and 0.7 mm, reducing the pressure drop effect of the air gap on the magnetic potential of the ferrite permanent magnet 500, which is beneficial to ensure the magnetic potential of the ferrite permanent magnet 500 to ensure the output power of the rotor. At the same time, the axial length of the rotor core 300 is increased, so that its axial length The degree L1 is between 85mm and 150mm, which ensures that the saturation magnetic flux density of the rotor core 300 is at a larger value, thereby improving the efficiency of the compressor and preventing the low remanence of the ferrite permanent magnet 500 from affecting the power of the compressor. When the distance between the stator core 200 and the rotor core 300 is reduced and the axial length of the rotor core 300 is increased, the two ends of the rotating shaft 400 are rotatably connected to the casing 100, which can accurately confine the rotor core 300 to the center hole, avoid eccentric rotation of the rotor core 300 and interference with the stator core 200, avoid abnormal noise, and thus ensure the operating stability of the compressor.

[0038] It can be understood that in the related art, the efficiency and maximum output capacity of the motor in the compressor can be improved by reasonably limiting the size of the air gap between the stator and rotor cores 300 and the stator core 200 and increasing the axial length of the rotor core 300. When only one end of the rotating shaft 400 is connected to the casing 100, the stator and rotor with a small air gap and the rotor core 300 with a long axial length are prone to the shaft 400 swinging, resulting in the risk of bore sweeping. The double support structure in which both ends of the rotating shaft 400 are connected to the casing in this solution can avoid bore sweeping when the rotor rotates at high speed, thereby improving the operating reliability of the compressor. Specifically, in this solution, with respect to reducing the air gap, such as Figure 5 As shown in FIG. 1 , when the air gap P is between 0.4 mm and 0.7 mm, the maximum output torque of the motor in the compressor is above 21.6 N*m. Of course, if the process allows, the air gap P can also be below 0.4 mm. Figure 6 As shown, when L1 is between 85 mm and 150 mm, the efficiency of the motor in the compressor is above 93%.

[0039] It should be noted that the ferrite permanent magnet 500 has the characteristics of high coercive force. The use of the ferrite permanent magnet 500 is not only conducive to reducing the manufacturing cost of the compressor, but also effectively improves the overall anti-demagnetization ability of the compressor, reduces the iron loss of the rotor core 300 and the stator core 200, thereby improving the efficiency and durability of the compressor. Furthermore, since dysprosium and terbium are heavy rare earth elements, and heavy rare earth elements are national strategic resources, the use of the ferrite permanent magnet 500 is conducive to reducing the iron loss of the motor in the compressor and ensuring its efficiency, while reducing the consumption of strategic resources, thereby helping to reduce the manufacturing cost of the compressor and improve the cost performance of the compressor. In addition, limiting the air gap between 0.4 mm and 0.7 mm reduces the magnetic resistance of the air gap in the magnetic flux and improves the compactness between the stator core 200 and the rotor core 300. In this case, the two ends of the rotating shaft 400 are rotatably connected to the casing 100. Compared with the prior art in which the lower end of the rotating shaft 400 is rotatably connected to the casing 100, the rotating shaft 400 of this solution can accurately limit the rotation of the rotor core 300 in the center hole, thereby preventing the rotor core 300 from rotating and interfering with the stator core 200, which is not only beneficial to ensuring the output power of the compressor, but also reduces the possibility of abnormal noise from the compressor.

[0040] Specifically, if P≤0.4mm, it means that the distance between the stator core 200 and the rotor core 300 is too small, which has high requirements for the manufacturing process and installation level. In addition, in the application environment of the compressor, the too low air gap will inevitably cause the stator core 200 and the rotor core 300 to collide due to vibration, thereby affecting the stability of the compressor output power. If P≥0.7mm, it means that the distance between the stator core 200 and the rotor core 300 is too large, which has a large pressure drop effect on the magnetic potential of the ferrite permanent magnet 500, which is not conducive to ensuring the magnetic potential of the ferrite permanent magnet 500, thereby reducing the output power of the motor in the compressor.

[0041] Further, in this embodiment, please refer to Figures 2 to 5 , P satisfies: 0.4mm<P<0.55mm. It can be understood that limiting the air gap to between 0.4mm and 0.55mm can ensure that the distance between the stator core 200 and the rotor core 300 is in a lower range, so as to further reduce the magnitude of the magnetic pressure drop, ensure the magnetic potential of the ferrite permanent magnet 500, and thus improve the output torque of the motor in the compressor, as shown in Figure 5 As shown, when P is between 0.4 mm and 0.55 mm, the maximum output torque of the motor in the compressor is above 22 N*m. Of course, in other embodiments, the air gap P between the stator core 200 and the rotor core 300 may also satisfy: 0.55 mm ≤ P < 0.7 mm.

[0042] In one embodiment, please refer to Figures 1 to 4, define the axial length of the rotor core 300 as L1, define the length of the shaft 400 as L2, L1 and L2 satisfy: 0.3≤L1 / L2≤0.5. It should be noted that the rotor core 300 has good magnetic conductivity. Increasing the proportion of the axial length of the rotor core 300 to the length of the shaft 400, that is, increasing the axial length of the rotor core 300, thereby increasing the magnetic flux density, and increasing the saturation magnetic flux density of the rotor core 300, can ensure that there is a strong magnetic force between the rotor and the stator, not only to avoid the influence of the low remanence of the ferrite permanent magnet 500, or to increase the magnetic flux density, but also to reflect the effect of improving the efficiency of the motor in the compressor. In addition, both ends of the shaft 400 are rotatably connected to the housing 100. When the axial length of the rotor core 300 is increased, the rotor core 300 can still be guaranteed to rotate stably in the center hole, thereby ensuring the reliability and stability of the compressor operation. Specifically, L1 / L2 can be 0.3, 0.4, 0.45 or 0.5, etc. If L1 / L2 < 0.3, the ratio of the axial length of the rotor core 300 to the length of the shaft 400 is low, which reduces the saturation flux density of the rotor core 300, thereby weakening the output power of the motor in the compressor. Of course, in other embodiments, L1 / L2 can also be greater than 0.5 to further increase the saturation flux density of the rotor core 300 and increase the output power of the compressor.

[0043] In one embodiment, please refer to Figure 1 , Figure 3 and Figure 6 , define the axial length of the rotor core 300 as L1, L1 satisfies: 100mm≤L1≤140mm. In this way, the axial length of the rotor core 300 is not less than 100mm, ensuring that the saturation magnetic flux density of the rotor core 300 is at a larger value. When the magnetic potential of the permanent magnet is reduced or unchanged, it has a positive effect on promoting the efficiency of the compressor, and ensures that when using low-cost ferrite permanent magnets 500, the compressor can still reach the predetermined power, thereby reducing the cost of the compressor. At the same time, the axial length of the rotor core 300 is limited to no more than 140mm. Since the saturation magnetic flux density has an upper limit value, continuously increasing the axial length of the rotor core 300 is not only not conducive to the layout inside the compressor, but also a rotor core 300 with a length that is too large also requires a larger magnetic potential drive, which easily reduces the efficiency of the compressor. As Figure 6 As shown, when L1 increases to more than 140 mm, the efficiency of the motor in the compressor begins to decrease. Thus, limiting L1 to between 100 mm and 140 mm can ensure that the efficiency of the motor in the compressor is above 93.5%. Specifically, the axial length of the rotor core 300 is 110 mm, 130 mm, or 140 mm. Of course, in other embodiments, L1 may also be between 85 mm and 100 mm, or between 140 mm and 150 mm.

[0044] In one embodiment, please refer to Figure 1 and Figure 3 , the remanence Br of the ferrite permanent magnet 500 is less than 0.5T. According to the above description, it can be understood that the remanence of the ferrite permanent magnet 500 is relatively low. Limiting the remanence Br of the ferrite permanent magnet 500 to less than 0.5T can ensure that the operating environment of the ferrite permanent magnet 500 is good, reduce the requirements for the operating environment, and improve the operating stability and reliability of the compressor. In addition, the volume of the ferrite permanent magnet 500 is within the range of the volume of the rotor core 300, avoiding the formation of a large magnetic resistance due to the excessive volume of the ferrite permanent magnet 500, which increases the iron loss of the compressor and affects the efficiency of the compressor. At the same time, the volume of the ferrite permanent magnet 500 with low remanence also ensures the volume of the rotor core 300, thereby ensuring the magnetic conductivity of the rotor core 300, thereby improving the efficiency of the motor in the compressor. It should be noted that the above remanence Br values ​​are all limited requirements under an environment of 20°C.

[0045] In one embodiment, please refer to Figure 1 and Figure 3 , define the outer diameter of the stator core 200 as D1, define the inner diameter of the stator core 200 as D2, D1 and D2 satisfy: 0.5≤D2 / D1≤0.65. It can be understood that in this embodiment, the inner diameter of the stator core 200 is relatively large, and at the same time, the volume of the rotor is also configured to be relatively large, so as to improve the magnetic saturation capacity of the rotor core 300. Therefore, the volume or residual magnetism of the permanent magnet on the rotor core 300 can be reduced synchronously to reduce costs and ensure the output power of the compressor, or the residual magnetism of the permanent magnet is increased synchronously with its volume, thereby improving the output power of the compressor. Similarly, the volume of the rotor core 300 is relatively large, and the area of ​​the through hole inside the rotor for the circulation of refrigeration oil and refrigerant is also relatively large, so that the refrigeration oil and refrigerant can be effectively guaranteed to pass through the rotor smoothly, ensure the circulation of the refrigeration oil, and improve the operating energy efficiency of the compressor. In addition, the stator core 200 with a large inner diameter has a large number of teeth to increase the number of windings. At the same time, a stator slot is formed between two adjacent teeth, and the winding is wound between two unconnected stator slots so that the winding can fill the stator slot as much as possible to increase the output power of the compressor. Of course, in other embodiments, the inner diameter of the stator core 200 can also be smaller, expressed as 0.4<D2 / D1<0.5.

[0046] In one embodiment, please refer to Figure 1 and Figure 3, the axial length of the ferrite permanent magnet 500 is consistent with the axial length of the rotor core 300. In this way, the ferrite permanent magnet 500 has a magnetic potential in the axial direction of the rotor core 300, ensuring that the magnetomotive force of the rotor core 300 is balanced at all axial locations, so as to promote the stability of the rotation of the rotor core 300 around the rotating shaft 400 and ensure the output power of the compressor.

[0047] In one embodiment, please refer to Figure 1 and Figure 2 The compressor further comprises a pump body 800, the rotor core 300 and the pump body 800 are arranged in the upper and lower parts of the housing 100, the lower end of the rotating shaft 400 is rotatably connected to the pump body 800 through the lower bearing 700, and the upper end of the rotating shaft 400 is rotatably connected to the upper part of the housing 100 through the upper bearing 600. It can be understood that the rotating shaft 400 is rotatably connected to the housing 100, and during the operation of the compressor, the refrigerant is compressed and pumped by the pump body 800, and then enters the output port of the compressor through the through hole on the rotor core 300 for output. In this way, the rotor core 300 and the pump body 800 are distributed up and down, the upper end of the rotating shaft 400 is rotatably connected to the upper wall of the housing 100 through the upper bearing 600, and the lower end of the rotating shaft 400 is rotatably connected to the pump body 800 through the lower bearing 700, which not only ensures the stable flow of the refrigerant in the compressor, but also reduces the volume of the compressor, and effectively ensures the stability of the rotor core 300 in the housing 100. Without loss of generality, the pump body 800 is fixed to the lower part of the housing 100 and is relatively fixed to the housing 100 in the circumferential direction, so that when the rotating shaft 400 rotates, the pump body 800 can stably support the rotating shaft 400 and avoid rotating with the rotating shaft 400. Of course, in other embodiments, the upper end of the rotating shaft 400 can also be relatively fixed to the side wall of the housing 100 in the radial and axial directions through a fixing structure, and the lower end of the rotating shaft 400 is rotatably connected to the housing 100 in the same manner as the upper end, or remains rotatably connected to the pump body 800.

[0048] In one embodiment, please refer to Figure 1 and Figure 3 , the outer periphery of the stator core 200 is connected to the inner side of the housing 100 by welding. It can be understood that the stator core 200 is connected to the housing 100 by welding, which can ensure the connection stability between the stator core 200 and the housing 100, and the stator core 200 is directly connected to the housing 100 by welding, which reduces the volume of the compressor and improves the compactness and energy efficiency of the compressor. Of course, in other embodiments, the stator core 200 can also be connected to the housing 100 by snapping.

[0049] The utility model also provides a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Specifically, the refrigeration device can be an air conditioner or a refrigerator.

[0050] The above description is only an optional embodiment of the present invention, and does not limit the protection scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly used in other related technical fields are included in the protection scope of the present invention.

Claims

1. A compressor, characterized in that: include: chassis; A stator core is disposed in the housing, and a center hole is axially passed through the middle of the stator core; and A rotor core, wherein the rotor core is rotatably inserted in the center hole, the rotor core is provided with a plurality of ferrite permanent magnets, an axially extending rotating shaft is provided in the middle of the rotor core, and both ends of the rotating shaft are rotatably connected to the casing, an air gap between the stator core and the rotor core is defined as P, and P satisfies: 0.4mm<P<0.7mm, an axial length of the rotor core is defined as L1, and L1 satisfies: 85mm≤L1≤150mm.

2. The compressor according to claim 1, characterized in that The P satisfies: 0.4mm<P<0.55mm.

3. The compressor according to claim 1, characterized in that The L1 satisfies: 100mm≤L1≤140mm.

4. The compressor according to claim 1, characterized in that The remanence Br of the ferrite permanent magnet is defined as less than 0.5T.

5. The compressor according to claim 1, characterized in that The axial length of the rotor core is defined as L1, and the length of the rotating shaft is defined as L2. L1 and L2 satisfy: 0.3≤L1 / L2≤0.

5.

6. The compressor according to claim 1, characterized in that The outer diameter of the stator core is defined as D1, and the inner diameter of the stator core is defined as D2. D1 and D2 satisfy: 0.5≤D2 / D1≤0.

65.

7. The compressor according to any one of claims 1 to 6, characterized in that The axial length of the ferrite permanent magnet is consistent with the axial length of the rotor core.

8. The compressor according to any one of claims 1 to 6, characterized in that The compressor also includes a pump body, the rotor core and the pump body are respectively arranged in the upper and lower parts of the casing, the lower end of the rotating shaft is rotatably connected to the pump body through a lower bearing, and the upper end of the rotating shaft is rotatably connected to the upper part of the casing through an upper bearing.

9. The compressor according to any one of claims 1 to 6, characterized in that The outer periphery of the stator core is connected to the inner side of the casing by welding.

10. A refrigeration device, characterized in that: Comprising a compressor as claimed in any one of claims 1 to 9.

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