Compressor and refrigeration equipment

Abstract

The utility model discloses a compressor and refrigeration equipment, the compressor comprises a motor, the motor comprises a rotor and a stator, the rotor is provided with a plurality of magnet grooves and a plurality of magnetic barrier groups, the plurality of magnet grooves and the plurality of magnetic barrier groups are arranged at intervals along the circumferential direction of the rotor, and the axial thickness of the rotor is H; the stator comprises a plurality of stator teeth arranged at intervals in the circumferential direction of the stator, a stator groove is formed between every two adjacent stator teeth, the number of the stator grooves is Q, the inner diameter of the stator is D, the volume of a pump body of the compressor is P, and H * Q / (D * P) is larger than or equal to 0.65 and smaller than or equal to 1. According to the technical scheme of the utility model, the motor cost is greatly reduced, and the motor efficiency is ensured to meet the target requirement.

Description

Technical Field

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

[0002] Brushless motors with permanent magnets embedded in the rotor are widely used in home appliances such as air conditioner compressors due to their high efficiency. The motor efficiency has a huge impact on it, but there are many factors that affect the motor efficiency. For example, the shape of the stator or rotor punching can be changed to reduce copper loss and iron loss, or the thickness of the stator or rotor can be increased to reduce the magnetic group, increase the magnetic flux and flux density, and thus improve the motor efficiency.

[0003] However, in the current home appliance field, a relatively high level has been achieved, that is, the design has reached the stage of copper loss and iron loss balance. At this time, by changing the shape of the stator punching sheet, whether it is to reduce copper loss or iron loss, it will lead to an increase in the other loss, and ultimately cannot achieve a significant increase in motor efficiency. Therefore, the method of increasing the thickness of the stator or rotor is often used to improve the motor efficiency, but the thickness of the stator or rotor will inevitably lead to increased costs. Utility Model Content

[0004] The main purpose of the utility model is to provide a compressor, which aims to significantly reduce the cost of the motor while ensuring that the motor efficiency reaches the target requirement.

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

[0006] Motor, including:

[0007] A rotor, provided with a plurality of magnet slots and a plurality of magnetic barrier groups, wherein the plurality of magnet slots and the plurality of magnetic barrier groups are arranged at intervals along the circumference of the rotor, and the axial thickness of the rotor is H;

[0008] The stator comprises a plurality of stator teeth arranged at intervals along the circumference of the stator, a stator slot is formed between two adjacent stator teeth, the number of the stator slots is Q, the inner diameter of the stator is D, the pump body volume of the compressor is P, and 0.65≤H×Q / (D×P)≤1.

[0009] Optionally, 0.7≤H×Q / (D×P)≤0.9.

[0010] Optionally, the motor further comprises an electromagnetic coil, wherein the electromagnetic coil is wound around the stator teeth, and the electromagnetic coil has two opposite straight sides, and the two opposite straight sides are respectively passed through two stator slots spaced apart from each other.

[0011] Optionally, the electromagnetic coil is made of aluminum.

[0012] Optionally, the width of the stator teeth along the circumferential direction of the stator is E, a permanent magnet is provided in the magnet slot, and the thickness of the permanent magnet is T, and E / T<2.

[0013] Optionally, a permanent magnet is provided in the magnet slot, and a gap is provided between two ends of the magnet slot and two ends of the permanent magnet therein along the circumferential direction of the rotor.

[0014] Optionally, the magnet slot is configured as a curved slot recessed toward the center of the rotor, and both ends of the magnet slot extend toward the edge of the rotor.

[0015] Optionally, the curved groove is arranged in a U shape.

[0016] Optionally, the magnetic barrier group is arranged on a side of the magnet slot away from the center of the rotor, and extends along the extension direction of the magnet slot.

[0017] Optionally, the magnetic barrier group is configured as a plurality of magnetic barrier holes arranged at intervals, and along the radial direction of the rotor, each magnetic barrier group has at least one layer of magnetic barrier holes; and / or,

[0018] The magnetic barrier group is arranged in a C shape.

[0019] The utility model also provides a compressor, comprising the compressor as described above.

[0020] The technical solution of the utility model is to set a rotor and a stator in the motor, wherein the rotor is provided with a plurality of magnet slots and a plurality of magnetic barrier groups, wherein the plurality of magnet slots and the plurality of magnetic barrier groups are arranged at intervals along the circumference of the rotor, and the axial thickness of the rotor is H; the stator includes a plurality of stator teeth arranged at intervals along the circumference of the stator, and a stator slot is formed between two adjacent stator teeth, wherein the number of the stator slots is Q, the inner diameter of the stator is D, the displacement of the compressor is P, and 0.65≤H×Q / (D×P)≤1. Thus, the axial thickness of the rotor is controlled, and the efficiency and cost of the motor are set in a relatively optimal range, which can not only greatly reduce the cost of the motor, but also ensure that the motor efficiency reaches the target requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the assembly structure of the rotor and the stator in one embodiment of the compressor of the utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of the middle rotor;

[0024] Figure 3 for Figure 1 Schematic diagram of the structure of the stator;

[0025] Figure 4 for Figure 1 Schematic diagram of the relationship between the axial thickness of the mid-rotor and the motor cost and motor efficiency.

[0026] Description of Figure Numbers:

[0027] Label name Label name 10 Rotor 21 Stator teeth 11 Magnet slot 22 Stator slot 12 Magnetic barrier group 30 permanent magnet 121 Magnetic barrier hole 40 Solenoid coil 20 stator

[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 if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in 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 is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. 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 which is used in refrigeration equipment such as air conditioners.

[0033] In the embodiment of the present utility model, Figures 1 to 4 As shown, the compressor comprises:

[0034] Motor, including:

[0035] The rotor 10 is provided with a plurality of magnet slots 11 and a plurality of magnetic barrier groups 12. The plurality of magnet slots 11 and the plurality of magnetic barrier groups 12 are arranged at intervals along the circumferential direction of the rotor 10. The axial thickness of the rotor 10 is H.

[0036] The stator 20 includes a plurality of stator teeth 21 arranged at intervals along the circumference of the stator 20 , a stator slot 22 is formed between two adjacent stator teeth 21 , the number of the stator slots 22 is Q, the inner diameter of the stator 20 is D, the pump body volume of the compressor is P, and 0.65≤H×Q / (D×P)≤1.

[0037] Specifically, the compressor includes a motor, which can be configured as a permanent magnet assisted synchronous reluctance motor, which has multiple layers of rotor magnetic barriers and works by relying on the reluctance torque generated by the asymmetric rotor magnetic circuit. This motor is widely used in refrigeration equipment such as compressors because of its low cost, simple manufacturing, and low rotor loss.

[0038] The rotor 10 is often formed by stacking a plurality of rotor punchings and has a certain stacking height. Therefore, the axial thickness of the rotor 10 is the stacking thickness of the rotor punchings. The inner circumference of the stator 20 is formed with a plurality of stator teeth 21 arranged at intervals, and a stator slot 22 is formed between two adjacent stator teeth 21, so that the electromagnetic coil 40 passes through the stator slot 22 and is wound around the stator teeth 21. The rotor 10 is arranged on the inner circumference of the stator 20. When the stator winding is energized, the electromagnetic coil 40 generates an armature magnetic field, and the armature magnetic field is transmitted along the stator 20 to the rotor 10. The rotor 10 can rotate relative to the stator 20 to achieve normal operation of the motor. The material of the rotor punching can be a high magnetic permeability material, such as a silicon steel punching, which has a high magnetic flux rate, high structural strength, and is easy to process. A plurality of magnet slots 11 are provided on the rotor 10. The magnet slots 11 may be straight slots or may be arranged in a curved shape. When the magnet slots 11 are curved slots, the magnet slots 11 may have a curved portion, such as a U-shaped slot or a V-shaped slot, etc., or may have a plurality of curved portions. There is no specific limitation on this. When the magnet slots 11 have a plurality of curved portions, their shape is roughly arranged in a wavy shape.

[0039] In this embodiment, the magnet slot 11 is configured as a curved slot that is recessed toward the center of the rotor 10, and both ends of the magnet slot 11 extend toward the edge of the rotor 10. And a plurality of magnet slots 11 are arranged at intervals along the circumference of the rotor 10, specifically, they are evenly spaced in the circumferential direction with the center of the rotor 10 as the center of the circle. Both ends of the magnet slot 11 extend toward the edge of the rotor 10, that is, both ends of the magnet slot 11 are arranged near the edge of the rotor 10, and an area for setting a magnetic barrier group 12 is formed between the magnet slot 11 and the edge of the rotor 10, and each magnetic barrier group 12 is correspondingly arranged on the side of each magnet slot 11 away from the center of the circle of the rotor 10. Of course, in other embodiments, the magnet slot 11 can be configured as a V-shaped slot, a C-shaped slot, a trapezoidal slot, etc. When the magnet slot 11 is configured as a curved slot, preferably, the curved slot is arranged in a U shape.

[0040] It should be noted that the magnet slots 11 are mainly used to install the permanent magnets 30, and the permanent magnets 30 have magnetic poles, so the number of the magnet slots 11 is set to an even number, such as Figure 1 As shown, six magnet slots 11 are arranged at intervals along the circumference of the rotor 10, and a permanent magnet 30 is placed in each magnet slot 11, and the polarities of the permanent magnets 30 in any two adjacent magnet slots 11 are opposite, and multiple permanent magnets 30 are alternately distributed along the circumferential direction of the rotor 10 according to the N pole and the S pole. In this embodiment, multiple magnet slots 11 are set as a single-layer structure. Compared with the rotor 10 with a double-layer magnet slot 11 in the prior art, the permanent magnet 30 is placed in the single-layer magnet slot 11, which can increase the thickness of the permanent magnet 30 within a limited volume, thereby improving the anti-demagnetization ability of the permanent magnet 30 and improving the reliability of the motor; at the same time, the production efficiency of the rotor 10 with a single-layer magnet slot 11 is also higher; the number of permanent magnets 30 that need to be placed in the single-layer magnet slot 11 is also relatively reduced, resulting in a reduction in the overall amount of permanent magnets 30, and can further reduce the production cost of the rotor 10, thereby reducing the production cost of the motor.

[0041] A plurality of permanent magnets 30 are installed in a plurality of magnet slots 11. To ensure the performance of the rotor 10, the number of permanent magnets 30 is set to be no less than the number of magnet slots 11, and at least one permanent magnet 30 should be placed in each magnet slot 11. The shape of the permanent magnet 30 is adapted to the shape of the magnet slot 11, and the permanent magnet 30 has at least two oppositely arranged side edges that abut against the inner wall surface corresponding to the magnet slot 11 to ensure the stability of the permanent magnet 30 after being installed in the magnet slot 11. In terms of the selection of the material of the permanent magnet 30, in order to increase the permanent magnet torque of the motor as much as possible, it is generally desired to select a relatively high-performance permanent magnet 30, and the amount of the permanent magnet 30 used should fill the magnet slot 11 as much as possible.

[0042] In one embodiment, along the circumference of the rotor 10, a gap is provided between the two ends of the magnet slot 11 and the two ends of the permanent magnet 30 therein, thereby effectively avoiding the situation where the d-axis armature magnetic potential is concentrated on the ends of the permanent magnet 30, and the demagnetization current of the motor can be well improved. The gap can be filled with air, and further, the gap can also be used to fill a non-magnetic medium. Specifically, filling the gap with air or a non-magnetic medium avoids the situation where the ends of the permanent magnet 30 are easily demagnetized and the magnetization is not saturated, and the anti-demagnetization ability of the motor is also improved.

[0043] In this embodiment, the magnetic barrier group 12 is configured to be provided with a plurality of magnetic barrier holes 121 arranged at intervals, and the plurality of magnetic barrier holes 121 are arranged at intervals along the extension direction of the magnet slot 11. The magnetic barrier group 12 is used to reduce magnetic leakage and improve the utilization rate of the magnet, and the magnetic barrier group 12 is provided on the side of the magnet slot 11 away from the center of the rotor 10, which can reduce the impact on the permanent magnetic force, and at the same time can standardize the path of the magnetic line of force, weaken the magnetic field harmonics in the air gap, and can also alleviate the degree of magnetic saturation, forming a magnetic barrier during the rotation of the rotor 10, so as to improve the power density and torque density of the motor, enhance the overload capacity of the motor, and effectively improve the torque pulsation of the motor. Among them, along the radial direction of the rotor 10, each magnetic barrier group 12 has at least one layer of magnetic barrier holes 121, that is, along the radial direction of the rotor 10, the magnetic barrier holes 121 between each magnet slot 11 and the outer edge of the rotor 10 are arranged to form at least one layer. In this embodiment, the magnetic barrier holes 121 between each magnet slot 11 and the outer edge of the rotor 10 are arranged to form a layer. In other embodiments, the magnetic barrier holes 121 between each magnet slot 11 and the outer edge of the rotor 10 can be arranged to form multiple layers.

[0044] When the curved groove is arranged in a U shape, in one embodiment, the magnetic barrier group 12 is arranged in a C shape, thereby further improving the adaptability of the magnet groove 11 and the magnetic barrier group 12, further improving the magnetic isolation effect of the magnetic barrier group 12, and improving its role in reducing leakage magnetic flux and improving magnet utilization.

[0045] It is understandable that the thicker the rotor 10 punching sheet is, the fewer the number of magnetic poles of the motor is, the smaller the magnetic resistance is, the greater the magnetic flux and magnetic flux density is, and the higher the motor efficiency is. However, the cost of the rotor punching sheet will also increase, and the thicker the rotor punching sheet is, the greater the mass of the rotor 10 is, which will increase the inertia of the rotor 10 and make dynamic balancing more difficult. Figure 1 and Figure 4 , Figure 4 Schematic diagram showing the relationship between the axial thickness of the rotor 10 and the motor cost and motor efficiency. Figure 1, take a 36-slot 6-pole motor as an example, that is, Q=36, take a suitable stator 20 inner diameter D and a corresponding compressor pump volume P, and substitute 0.65≤H×Q / (D×P)≤1 to obtain the axial thickness range of the stator 20. Then, through continuous testing, the efficiency and cost relationship diagram of the motor under different rotor 10 axial thickness H is obtained. For example, if the stator 20 inner diameter D is 85mm and the compressor displacement P is 58cm 3 , substituting 0.65≤H×Q / (D×P)≤1, the axial thickness range of the stator 20 is obtained to be 90mm≤H≤140mm, and then after continuous testing, it is obtained Figure 4 ,Depend on Figure 4 It can be seen that at this time the efficiency and cost of the motor are both in an optimal range. Therefore, at this time, the working efficiency of the motor can be improved and the cost of the motor can be controlled, thereby greatly reducing the cost of the motor while ensuring that the motor efficiency meets the target requirements.

[0046] More preferably, 0.7≤H×Q / (D×P)≤0.9, and the same 36-slot 6-pole motor, the inner diameter D of the stator 20 is 85 mm, and the compressor displacement P is 58 cm 3 For example, the axial thickness of the stator 20 is 95 mm to 125 mm. At this time, the efficiency and cost of the motor are in a more optimal range, so the working efficiency of the motor can be further improved and the cost of the motor can be controlled.

[0047] When a motor with 36 slots and 6 poles is used, in one embodiment, the motor further includes an electromagnetic coil 40, which is wound around the stator teeth 21, and the electromagnetic coil 40 has two opposite straight sides, and the two opposite straight sides are respectively inserted into two stator slots 22 spaced apart from each other. Specifically, the electromagnetic coil 40 is sleeved on the stator 20 to form a rectangular ring, which has two oppositely arranged straight sides extending along the axial direction of the stator 20, and two connecting sides respectively connecting the two ends of the two straight sides, and the two opposite straight sides are respectively inserted into two stator slots 22 spaced apart from each other, that is, the electromagnetic coil 40 is wound around two non-adjacent stator slots 22, and at this time, the two connecting sides are at least straddled across two stator teeth 21, that is, the electromagnetic coil adopts a winding method of distributed winding, thereby improving the uniformity of the distribution of the electromotive force, thereby reducing the loss inside the motor, extending the service life of the motor, and also improving the starting and acceleration performance of the motor, so that the power output of the motor is more stable. Among them, in this embodiment, the two connecting sides are respectively straddled across 6 stator teeth 21.

[0048] Furthermore, the width of the stator teeth 21 along the circumference of the stator 20 is E, and a permanent magnet 30 is provided in the magnet slot 11, and the thickness of the permanent magnet 30 is T, E / T<2. Specifically, because the motor adopts a distributed winding winding method, if the width of the stator teeth 21 is too large, that is, when E / T≥2, the number of stator teeth 21 is small, which not only affects the anti-demagnetization ability of the motor and the efficiency of the motor, but also easily generates more harmonics, resulting in a lower electric energy conversion efficiency of the motor, increasing motor losses, and generating electromagnetic vibration and noise. In addition, it is easy to cause the motor salient pole rate to decrease, resulting in a decrease in the magnetic properties of the motor; if the thickness of the permanent magnet 30 is insufficient, it is also easy to affect the anti-demagnetization ability of the permanent magnet 30 and reduce the reliability of the motor.

[0049] In this embodiment, the material of the electromagnetic coil 40 is aluminum, which has a lower cost than copper, thereby further reducing the manufacturing cost of the motor. In other embodiments, the material of the electromagnetic coil 40 may also be copper or the like.

[0050] The utility model also proposes a compressor, which includes a compressor. The specific structure of the compressor refers to the above embodiment. Since the compressor 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 repeated here one by one.

[0051] The above description is only a preferred embodiment of the present invention, and does not limit the patent 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 applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A compressor, It is characterized in that include: Motor, including: A rotor, provided with a plurality of magnet slots and a plurality of magnetic barrier groups, wherein the plurality of magnet slots and the plurality of magnetic barrier groups are arranged at intervals along the circumference of the rotor, and the axial thickness of the rotor is H; The stator comprises a plurality of stator teeth arranged at intervals along the circumference of the stator, a stator slot is formed between two adjacent stator teeth, the number of the stator slots is Q, the inner diameter of the stator is D, the pump body volume of the compressor is P, and 0.65≤H×Q / (D×P)≤1.

2. The compressor according to claim 1, It is characterized in that 0.7≤H×Q / (D×P)≤0.

9.

3. The compressor according to claim 1, It is characterized in that The motor further comprises an electromagnetic coil, which is wound around the stator teeth and has two opposite straight sides, which are respectively passed through two stator slots spaced apart from each other.

4. The compressor according to claim 3, It is characterized in that The material of the electromagnetic coil is aluminum.

5. The compressor according to claim 3, It is characterized in that The width of the stator teeth along the circumferential direction of the stator is E, a permanent magnet is provided in the magnet slot, and the thickness of the permanent magnet is T, and E / T<2.

6. The compressor according to claim 1, It is characterized in that A permanent magnet is arranged in the magnet slot, and a gap is arranged between two ends of the magnet slot and two ends of the permanent magnet therein along the circumferential direction of the rotor.

7. The compressor according to claim 1, It is characterized in that The magnet groove is configured as a curved groove recessed toward the center of the rotor, and both ends of the magnet groove extend toward the edge of the rotor.

8. The compressor according to claim 7, It is characterized in that The curved groove is arranged in a U shape.

9. The compressor according to claim 7, It is characterized in that The magnetic barrier group is arranged on a side of the magnet slot away from the center of the rotor and extends along the extension direction of the magnet slot.

10. The compressor according to claim 9, It is characterized in that The magnetic barrier group is configured as a plurality of magnetic barrier holes arranged at intervals, and along the radial direction of the rotor, each magnetic barrier group has at least one layer of magnetic barrier holes; and / or, The magnetic barrier group is arranged in a C shape.

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

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