Piercing crimping terminal, motor and compressor

Abstract

The invention discloses a piercing crimping terminal, a motor and a compressor, and relates to the technical field of compressors, the piercing crimping terminal comprises two crimping parts which are oppositely arranged at an interval and a connecting part for connecting the two crimping parts, and the two crimping parts and the connecting part jointly form an accommodating groove for an enameled wire to pass through. A plurality of grooves which are arranged at intervals are formed in the inner wall of the containing groove, the grooves are at least formed in the inner sides of the two crimping parts, terminal teeth are formed between every two adjacent grooves, the terminal teeth are used for puncturing the enameled wire, the thickness of the crimping parts is D, the height of the terminal teeth is L, and L and D meet the condition that L / D is larger than or equal to 0.14 and smaller than or equal to 0.46. According to the technical scheme, L / D is limited to be larger than or equal to 0.14 and smaller than or equal to 0.46, it is ensured that the terminal teeth can fully pierce the paint film of the enameled wire to form stable and reliable electric connection with the conductor of the enameled wire, excessive damage to the conductor of the enameled wire is avoided, and therefore the reliability and safety of connection between the piercing and crimping terminal and the enameled wire are both considered.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, in particular to a puncture crimping terminal, a motor and a compressor. Background Art

[0002] Piercing crimping terminals are used for quick connection of motor enameled wires, and their terminal teeth need to pierce the paint film to achieve conduction. However, if the height of the piercing terminal teeth is too small, the engagement depth between the enameled wire and the teeth may be insufficient after crimping, resulting in the paint film on the surface of the enameled wire not being easily squeezed or the enameled wire paint film having fewer puncture points, thus affecting the crimping and short-circuiting effect of the piercing crimping terminal. When the motor is in a coupled working condition of high temperature, vibration and high current operation, the internal stress of the piercing crimping terminal will be released, and the contact resistance will increase or the direct contact will be poor, causing abnormal operation of the compressor. If the terminal teeth are too high, excessive mechanical stress will be applied to the enameled wire during the crimping process, which may cause the enameled wire to break easily after crimping. Summary of the Invention

[0003] The main purpose of the present invention is to provide a piercing crimping terminal, a motor and a compressor, aiming to take into account both the reliability and safety of the connection between the piercing crimping terminal and the enameled wire.

[0004] To achieve the above-mentioned purpose, the piercing crimping terminal proposed in the present invention includes two crimping parts arranged relatively at intervals and a connecting part connecting the two crimping parts. The two crimping parts and the connecting part jointly form a receiving groove for the enameled wire to pass through. The inner wall of the receiving groove is formed with a plurality of grooves arranged at intervals. The grooves are formed on at least the inner sides of the two crimping parts. Terminal teeth are formed between two adjacent grooves. The terminal teeth are used to pierce the enameled wire. The thickness of the crimping part is D, and the height of the terminal teeth is L. L and D satisfy: 0.14≤L / D≤0.46.

[0005] In one embodiment, L≧0.08 mm.

[0006] In one embodiment, 0.4 mm ≤ D ≤ 0.57 mm.

[0007] In one embodiment, the crimping portion has a first crimping area and a second crimping area, and the terminal teeth include a first tooth portion provided in the first crimping area and a second tooth portion provided in the second crimping area, the height of the first tooth portion is L1, and the height of the second tooth portion is L2, and L1 and L2 satisfy: L1≥L2.

[0008] In one embodiment, the number of the first tooth portions is m1, the number of the second tooth portions is m2, and m1 and m2 satisfy: m1>m2.

[0009] In one embodiment, m2 / (m2+m1)≤0.23.

[0010] In one embodiment, the piercing crimping terminal further includes a mating portion, which is provided on a side of the first crimping area away from the second crimping area and connected to the connecting portion, and is used to connect to an external terminal.

[0011] In one embodiment, the mating portion includes a base plate and multiple side plates, the base plate is connected to the connecting portion, the side plates are connected to the edge of the base plate, and the base plate and the side plates together enclose a slot for inserting the external terminal.

[0012] In one embodiment, the matching portion, the connecting portion, and the crimping portion are integrally formed.

[0013] In one embodiment, each of the grooves sequentially connects one of the crimping portions, the connecting portion, and another of the crimping portions.

[0014] In one embodiment, a spike portion is provided on an end surface of the terminal tooth facing the inner side of the accommodating groove, and the spike portion extends along the extending direction of the groove.

[0015] In one embodiment, the spike portion is conical, and the tip of the spike portion faces the inside of the receiving groove.

[0016] The present invention also provides a motor, comprising an enameled wire and the aforementioned piercing and crimping terminal.

[0017] In one embodiment, the cross-sectional area of ​​the enameled wire is S, the number of the terminal teeth is n, and S and n satisfy: S / n≤0.22.

[0018] In one embodiment, 5≤n≤9.

[0019] The present invention also provides a compressor comprising the aforementioned motor.

[0020] The technical solution of the present invention limits the ratio of the height L of the terminal teeth to the thickness D of the crimping part to satisfy 0.14≤L / D≤0.46, thereby ensuring that the terminal teeth can fully pierce the paint film of the enameled wire to form a stable and reliable electrical connection with the conductor of the enameled wire, while avoiding excessive damage to the conductor of the enameled wire. Even under complex working conditions such as high temperature, vibration, and high current, the pierced crimping terminal and the enameled wire can still maintain low contact resistance and high mechanical connection strength, taking into account the reliability and safety of the connection between the pierced crimping terminal and the enameled wire, thereby improving the reliability and durability of the operation of the motor and compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of an embodiment of a puncture crimping terminal provided by the present invention; Figure 2 A schematic structural diagram of another embodiment of the puncture crimping terminal provided by the present invention; Figure 3 for Figure 2 A top view of the pierced crimp terminal; Figure 4 for Figure 1 A partial cross-sectional view of the piercing crimp terminal; Figure 5 A partial cross-sectional view of another embodiment of the piercing crimping terminal provided by the present invention; Figure 6 A top view of the motor provided by the present invention; Figure 7 A comparison diagram of contact resistance and temperature rise between the puncture crimping terminal of the present invention and a conventional terminal after multiple stresses; Figure 8 This is a comparison chart of the temperature rise of the puncture crimping terminal of the present invention and the conventional terminal after cyclic current carrying for 500 hours.

[0023] Description of Figure Numbers: 10. Puncture crimp terminal; 20. Enameled wire; 30. Stator; 100. Crimping portion; 200. Connecting portion; 300. Accommodating groove; 400. Fitting portion; 310. Groove; 320. Terminal tooth; 321. First tooth portion; 322. Second tooth portion; 330. Spike portion; 410. Bottom plate; 420. Side plate; 430. Slot.

[0024] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, 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 it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually 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 present invention.

[0028] The present invention provides a piercing crimping terminal.

[0029] See also Figures 1 to 4 In one embodiment of the present invention, the piercing crimping terminal 10 includes two crimping parts 100 arranged relatively spaced apart and a connecting part 200 connecting the two crimping parts 100. The two crimping parts 100 and the connecting part 200 jointly form an accommodating groove 300 for the enameled wire 20 to pass through. The inner wall of the accommodating groove 300 is formed with a plurality of grooves 310 arranged at intervals. The grooves 310 are formed on at least the inner sides of the two crimping parts 100. Terminal teeth 320 are formed between two adjacent grooves 310. The terminal teeth 320 are used to pierce the enameled wire 20. The thickness of the crimping part 100 is D, and the height of the terminal teeth 320 is L. L and D satisfy: 0.14≤L / D≤0.46.

[0030] Specifically, the piercing crimping terminal 10 is mainly used in motors. The enameled wire 20 of the motor is placed between the two crimping parts 100 for crimping, so as to achieve piercing short-circuiting and fixation between the enameled wire 20 and the piercing crimping terminal 10. This type of piercing crimping terminal 10 is a key component that affects the electrical reliability of the motor. The compressor motor is fixed inside the compressor and is in a high-temperature, high-pressure working environment for a long time. With the development trend of broadband and miniaturization of permanent magnet motors for compressors, the stress environment of the motor, such as current shock, temperature, humidity and vibration, has become more severe and more complex. The crimping and piercing short-circuiting effect of the piercing crimping terminal 10 directly affects the terminal temperature and temperature rise performance during long-term operation of the motor. If the paint film of the enameled wire 20 is pierced by the crimping terminal 10 and the piercing effect is poor, it is easy to cause the motor to burn out. Among them, the shape, height and number of teeth of the piercing crimping terminal 10 are important factors affecting the electrical reliability of the connecting part 200.

[0031] The puncture crimping terminal 10 includes two opposing crimping portions 100 and a connecting portion 200. The two relatively spaced crimping portions 100 deform inwardly during the crimping process to clamp the enameled wire 20 passing through. The accommodating groove 300 is a space enclosed by the two crimping portions 100 and the connecting portion 200, and is used to accommodate the enameled wire 20 to be connected. A plurality of spaced grooves 310 are provided on the inner wall of the accommodating groove 300. The grooves 310 are formed on at least the inner sides of the two crimping portions 100, that is, the grooves 310 can be formed only on the two opposing inner side surfaces of the two crimping portions 100, and the inner surface of the connecting portion 200 is not formed with the grooves 310. Of course, in other embodiments, the inner side surfaces of both the two crimping portions 100 and the connecting portion 200 can also be formed with grooves 310. The raised portions between adjacent grooves 310 on the inner wall of the accommodating groove 300 form spaced apart terminal teeth 320 , which are used to pierce the paint film on the surface of the enameled wire 20 during the crimping process, thereby achieving direct conduction between the conductor inside the enameled wire 20 and the pierced crimping terminal 10 .

[0032] The thickness of the crimping portion 100 along the extension direction of the enameled wire 20 can be uniform, or it can gradually increase or decrease. When the thickness of the crimping portion 100 along the extension direction of the enameled wire 20 gradually increases or decreases, the height of the terminal teeth 320 formed at the corresponding position increases or decreases accordingly. The extension direction of the groove 310 intersects the extension direction of the enameled wire 20. The thickness of the crimping portion 100 along the extension direction of the groove 310 can be uniform, or it can gradually increase or decrease. When the thickness of the crimping portion 100 along the extension direction of the groove 310 gradually increases or decreases, the height of the terminal teeth 320 formed at the corresponding position increases or decreases accordingly.

[0033] The technical solution of the present invention balances the stability and safety of the connection between the puncture crimping terminal 10 and the enameled wire 20 by limiting the ratio of the height L of the terminal teeth 320 to the thickness D of the crimping portion 100, ensuring that the terminal can maintain an efficient, reliable and safe electrical connection under various working conditions.

[0034] Among them, the measurement method of the thickness D of the crimping part 100 is: select a point on the outer surface of the crimping part 100 as the first measuring point, and select another point on the inner surface of the crimping part 100 as the second measuring point. The first measuring point and the second measuring point are arranged opposite to each other, and the distance between the first measuring point and the second measuring point is the thickness D of the crimping part 100.

[0035] The height L of the terminal tooth 320 is measured by selecting a point on the bottom surface of the groove 310 as the third measuring point. The distance between the plane containing the third measuring point and the plane containing the second measuring point is the height L of the terminal tooth 320. When the bottom surface of the groove 310 is flat, any point can be selected as the third measuring point. When the bottom surface of the groove 310 is curved, the third measuring point is located at the lowest point of the bottom surface of the groove 310.

[0036] Specifically, when 0.14 ≤ L / D, the terminal teeth 320 have sufficient height to effectively penetrate the surface of the enameled wire 20 during the crimping process, ensuring sufficient engagement depth between the terminal teeth 320 and the crimped enameled wire 20. This further ruptures the paint film on the surface of the enameled wire 20 and increases the number of puncture points, exposing a sufficient area of ​​metal conductor, forming a low-resistance, highly stable electrical connection. This improves the reliability of the connection between the puncture crimp terminal 10 and the enameled wire 20 and enhances the shorting effect of the crimping of the puncture crimp terminal 10. Under these conditions, no abnormalities are observed when testing the inter-wire resistance and crimp resistance (i.e., contact resistance) of the motor. Even under complex operating conditions such as high temperature, vibration, and high current operation, this design effectively suppresses the release of stress within the puncture crimp terminal 10, preventing increased contact resistance or poor direct contact. This significantly reduces the risk of abnormal compressor operation and ensures the stability and safety of the equipment.

[0037] If the height of the terminal teeth 320 is too great, excessive localized stress will be applied to the enameled wire 20 during the crimping process, potentially causing excessive compression or even breakage of the copper conductor of the enameled wire 20 (especially for thin-diameter enameled wire 20). Although sufficient puncture is achieved, the conductor is severely damaged, reducing overall conductivity and mechanical strength. There is also the risk of deep puncture and conductor breakage, impacting long-term operational reliability. By limiting L / D to ≤ 0.46, the risk of crimping stress concentration and conductor shearing or breaking caused by excessive height of the terminal teeth 320 is effectively avoided, thereby improving the safety of the connection between the puncture crimp terminal 10 and the enameled wire 20.

[0038] See also Figure 7 , Figure 7 The following is a comparison of the contact resistance and temperature rise of the piercing crimp terminal of the present invention and a conventional terminal after multiple stresses. Multiple stress tests were performed on the conventional terminal and the piercing crimp terminal 10 of the present invention. The temperatures were measured before and after the tests to determine the temperature rise of the corresponding samples after the multiple stresses. The contact resistance was also measured after the tests to determine the contact resistance of the corresponding samples after the multiple stresses. Five sets of repeatability tests were conducted using samples with an L / D ratio of 0.12 for the conventional terminal and an L / D ratio of 0.35 for the piercing crimp terminal of the present invention. Figure 7 The horizontal axis represents the sample numbers of the five sets of repetitive test samples. The temperature rise of the five sets of repetitive samples of conventional terminals after multiple stresses ranged from 24°C to 38°C, while the temperature rise of the five sets of repetitive samples of the piercing crimp terminal 10 of the present invention after multiple stresses ranged from 13°C to 18°C. In other words, the temperature rise of the piercing crimp terminal 10 of the present invention before and after the test was less than that of the conventional terminal. The contact resistance of 5 groups of repetitive samples of conventional terminals after multiple stresses ranges from 4mΩ to 5.5mΩ, and the contact resistance of 5 groups of repetitive samples of the piercing crimping terminal 10 of the present invention after multiple stresses ranges from 2mΩ to 3mΩ. That is, the contact resistance of the piercing crimping terminal 10 of the present invention is smaller than the contact resistance of the conventional terminal before and after the test, indicating that by limiting the ratio of the height L of the terminal tooth 320 to the thickness D of the crimping portion 100 to satisfy 0.14≤L / D≤0.46, the temperature rise and contact resistance of the piercing crimping terminal 10 can be reduced, thereby improving the reliability and safety of the connection between the piercing crimping terminal 10 and the enameled wire 20.

[0039] Furthermore, after multiple stresses, the temperature rise of five sets of repetitive samples of conventional terminals fluctuated by as much as 10°C, and the contact resistance fluctuated by as much as 1.5 mΩ. However, after multiple stresses, the temperature rise of five sets of repetitive samples of the piercing crimp terminal 10 of the present invention fluctuated by no more than 5°C, and the contact resistance fluctuated by no more than 1 mΩ. In other words, in this repetitive test, compared to conventional terminals, the temperature rise and contact resistance fluctuations of the piercing crimp terminal 10 of the present invention were smaller, indicating that the connection between the piercing crimp terminal 10 of the present invention and the enameled wire 20 is more stable and reliable.

[0040] See also Figure 8 , Figure 8This chart compares the temperature rise of the present invention's piercing crimp terminal and a conventional terminal after 500 hours of cyclic current carrying. A 500-hour cyclic current carrying test was conducted on both the conventional terminal and the present invention's piercing crimp terminal 10. The temperature rise of each sample after 500 hours of cyclic current carrying was measured before and after the test. Five sets of repeatable tests were conducted using samples with an L / D ratio of 0.12 for the conventional terminal and an L / D ratio of 0.35 for the present invention's piercing crimp terminal. Figure 8 The horizontal axis represents the sample numbers of the five sets of repetitive test samples. The temperature rise of the five sets of repetitive test samples for conventional terminals after 500 hours of cyclic current carrying ranged from 92°C to 120°C. The temperature rise of the piercing crimping terminal 10 of the present invention after 500 hours of cyclic current carrying ranged from 53.5°C to 57°C. This indicates that the temperature rise of the piercing crimping terminal 10 of the present invention is lower than that of the conventional terminal. This indicates that by limiting the ratio of the height L of the terminal teeth 320 to the thickness D of the crimping portion 100 to 0.14≤L / D≤0.46, the temperature rise of the piercing crimping terminal 10 can be reduced. Even under conditions where high currents repeatedly impact the piercing crimping terminal 10, the piercing crimping terminal 10 can maintain a low temperature rise.

[0041] Furthermore, the temperature rise of five sets of repeatable samples of conventional terminals after 500 hours of cyclic current carrying fluctuated by as much as 28°C. However, the temperature rise of the piercing crimp terminal 10 of the present invention after 500 hours of cyclic current carrying fluctuated by no more than 3.5°C. In other words, in this repeatable test, the temperature rise fluctuation of the piercing crimp terminal 10 of the present invention was smaller than that of the conventional terminal, indicating that the connection between the piercing crimp terminal 10 of the present invention and the enameled wire 20 is more stable and reliable.

[0042] The technical solution of the present invention limits the ratio of the height L of the terminal tooth 320 to the thickness D of the crimping part 100 to satisfy 0.14≤L / D≤0.46, thereby ensuring that the terminal tooth 320 can fully pierce the paint film of the enameled wire 20 to form a stable and reliable electrical connection with the conductor of the enameled wire 20, while avoiding excessive damage to the conductor of the enameled wire 20. Even under complex working conditions such as high temperature, vibration, and high current, the pierced crimping terminal 10 and the enameled wire 20 can still maintain low contact resistance and high mechanical connection strength, taking into account the reliability and safety of the connection between the pierced crimping terminal 10 and the enameled wire 20, thereby improving the reliability and durability of the operation of the motor and compressor.

[0043] In one embodiment, see Figure 4 , L≥0.08mm.

[0044] When L is less than 0.08mm, the height of the terminal teeth 320 is insufficient, which may result in incomplete destruction of the paint film on the enameled wire 20, leading to localized poor conductivity. This can increase contact resistance or even cause poor direct contact, especially during long-term operation or in harsh environments such as high temperature and vibration. This increases the risk of malfunctioning compressors or other equipment. By setting L ≥ 0.08mm, the terminal teeth 320 are ensured to have sufficient height to pierce the paint film on the surface of the enameled wire 20, allowing good electrical contact between the terminal teeth 320 and the conductor of the enameled wire 20. This helps reduce contact resistance, improve conductivity efficiency, and reduce temperature rise.

[0045] In one embodiment, see Figure 4 , 0.4mm≤D≤0.57mm.

[0046] During the crimping process, the crimping portion 100 needs to withstand the radial extrusion force from the die and undergo plastic deformation inward to achieve clamping of the enameled wire 20 and penetration of the terminal teeth 320. By limiting 0.4mm≤D, the minimum thickness of the crimping portion 100 is set at 0.4mm to ensure that the crimping portion 100 has sufficient mechanical strength and deformation resistance, avoid deformation or damage caused by excessively thin materials, and avoid insufficient clamping force of the crimping portion 100, loose connections, or punctures, which reduces the overall mechanical strength of the crimped terminal 10. By limiting D≤0.57mm, the maximum thickness of the crimping portion 100 is limited to no more than 0.57mm, which helps to ensure that molding will not be difficult due to excessively thick materials during the crimping process. At the same time, it also ensures good electrical conductivity and appropriate elastic deformation capabilities, so as to better adapt to different working conditions and improve production efficiency and consistency.

[0047] In one embodiment, see Figure 4 , L≥0.08mm, and 0.4mm≤D≤0.57mm.

[0048] The range of the crimping portion 100's thickness D and the range of the terminal teeth 320's height L form a well-coordinated structural relationship, ensuring practical feasibility within the specified L / D ratio. Understandably, when D < 0.4 mm, even a relatively small L value may cause the L / D ratio to exceed the upper limit (0.46), causing the terminal teeth 320 to be relatively high and potentially damaging the conductor. On the other hand, if D is too large (> 0.57 mm), the L value may be forced to be too high to maintain effective puncture capability, increasing processing difficulty and material costs.

[0049] In one embodiment, see Figure 5 and Figure 6The crimping portion 100 has a first crimping area and a second crimping area, and the terminal tooth 320 includes a first tooth portion 321 provided in the first crimping area and a second tooth portion 322 provided in the second crimping area. The height of the first tooth portion 321 is L1, and the height of the second tooth portion 322 is L2. L1 and L2 satisfy: L1≥L2.

[0050] The puncture crimping terminal 10 is used to electrically connect the enameled wire 20 of the winding of the motor stator 30 to the external terminal. After the enameled wire 20 is led out from the stator 30, it passes through the receiving groove 300 from the second crimping area of ​​the crimping portion 100 and extends toward the first crimping area. Depending on the actual connection situation, the enameled wire 20 may or may not pass through the receiving groove 300 from the first crimping area. That is, the second crimping area is closer to the stator 30 in the extension direction of the enameled wire 20. The first crimping area undertakes the main electrical connection task and needs to form a stable, low-resistance conductive channel; the second crimping area is more responsible for initial positioning, auxiliary fixation and buffering. Especially under dynamic stresses such as vibration, thermal expansion and contraction, it is necessary to avoid rigid clamping that may cause the enameled wire 20 to break.

[0051] The first crimping zone is formed with a plurality of first teeth 321, and the second crimping zone is formed with a plurality of second teeth 322. Both L1 and L2 are greater than 0.08 mm. L1 can be equal to L2, meaning that all terminal teeth 320 have the same height in the direction of extension of the enameled wire 20. Alternatively, L1 can be greater than L2, meaning that the first teeth 321 have a greater height and the second teeth 322 have a smaller height. When the first teeth 321 have a greater height L1 and the second teeth 322 have a smaller height L2, this ensures that the first teeth 321 can fully pierce the paint film of the enameled wire 20 in the first crimping zone, forming a stable electrical connection. When the compressor is running, the enameled wire 20 may be affected by stress such as vibration, thermal expansion and contraction. The second crimping area is closer to the stator 30, and the enameled wire 20 is more likely to vibrate and bend here. By designing the tooth height L2 of the second tooth portion 322 to be smaller, the second tooth portion 322 provides a certain mechanical fixing effect while also providing a certain mechanical buffer, thereby avoiding the second crimping area from being crimped too tightly, which may cause the conductor of the enameled wire 20 here to break.

[0052] In one embodiment, see Figure 5 , the number of the first tooth portions 321 is m1, the number of the second tooth portions 322 is m2, and m1 and m2 satisfy: m1>m2.

[0053] m1 is the number of the first tooth parts 321 in the first crimping area, and m2 is the number of the second tooth parts 322 in the second crimping area. m1 > m2, that is, more first tooth parts 321 are arranged in the first crimping area to increase the effective piercing points and improve the probability of effectively piercing the paint film of the enameled wire 20. Multi-point contact can disperse the current density, reduce the local temperature rise, and prevent overheating or oxidation caused by poor single-point contact. Even if some of the first tooth parts 321 fail to be completely pierced due to manufacturing tolerances or crimping offsets, there are still more first tooth parts 321 to ensure conduction, improving the fault tolerance of the connection.

[0054] The second crimping area is close to the stator 30 and is easily affected by the bending stress caused by vibration and thermal cycling during the operation of the motor. If there are too many second tooth parts 322 in the second crimping area, it will cause the enameled wire 20 to be overly constrained here, forming a rigid fulcrum, and it is extremely easy to occur metal fatigue fracture under repeated bending. By setting m2 < m1, reducing the number of teeth in the second crimping area, the clamping force and stress concentration degree in this area are reduced, achieving the effect of balancing reliable fixation and mechanical buffering.

[0055] In other embodiments, it may also be m1 = m2.

[0056] In one embodiment, m2 / (m2 + m1) ≤ 0.23.

[0057] m2 / (m2 + m1) represents the proportion of the second tooth parts 322 in the total number of all terminal teeth 320. The number of the second tooth parts 322 does not exceed 23% of the total number of teeth, that is, the proportion of the number of the first tooth parts 321 is not less than 77%. By limiting m2 / (m2 + m1) ≤ 0.23, the clamping force in the second crimping area is effectively controlled, playing a role in stress buffering and improving the fatigue resistance. At the same time, it ensures that the first crimping area has sufficient piercing ability to improve the paint film removal rate, increase the contact area with the conductor of the enameled wire 20, reduce the initial contact resistance, and optimize the temperature rise of the motor.

[0058] In other embodiments, the number of the first tooth parts 321 and the second tooth parts 322 can also be limited to 0.23 < m2 / (m2 + m1) < 0.5.

[0059] In one embodiment, please refer to Figure 2 and Figure 3 , the piercing and crimping terminal 10 further includes a mating part 400. The mating part 400 is arranged on one side of the first crimping area away from the second crimping area and is connected to the connecting part 200. The mating part 400 is used to connect an external wiring terminal.

[0060] As a part of the puncture crimping terminal 10, the mating portion 400 provides a standard interface with other electrical components (such as cables, junction boxes, compressor plugs, light column terminals, etc.) to ensure the reliability and compatibility of the electrical connection. The mating portion 400 is connected to the connecting portion 200, which enhances the mechanical strength of the entire puncture crimping terminal 10, can effectively resist physical shocks and vibrations from the outside, and also ensures the continuity and stability from the enameled wire 20 to the external circuit. The mating portion 400 can adopt a slot 430, a spring clip or a bolt fixing design to ensure a stable connection. When the compressor vibrates, the mating portion 400 can absorb part of the mechanical stress and protect the stability of the electrical connection in the first crimping area. Furthermore, the mating portion 400 can be designed to a standard size or type, which is convenient for docking with common terminal blocks or other electrical accessories on the market, thereby improving the interchangeability and compatibility between devices.

[0061] In other embodiments, the mating portion 400 may not be provided, and the external connection terminal may be directly connected to the crimping portion 100 or the connecting portion 200 .

[0062] In one embodiment, see Figure 2 and Figure 3 The mating portion 400 includes a bottom plate 410 and a plurality of side plates 420. The bottom plate 410 is connected to the connecting portion 200. The side plates 420 are connected to the edge of the bottom plate 410. The bottom plate 410 and the side plates 420 together enclose a slot 430 for inserting an external terminal.

[0063] The base plate 410 is connected to the connection portion 200 and also provides support and guidance for the enameled wire 20. The side panels 420 are connected to the edges of the base plate 410 and are positioned around the perimeter of the base plate 410. Together, they enclose a slot 430 for the external wiring terminals. Once inserted into slot 430, the external wiring terminals form an interference fit with the inner walls of slot 430 (i.e., the inner surfaces of the side panels 420), securely securing the external wiring terminals within slot 430. This prevents loosening or dislodging due to long-term use or external forces, ensuring a durable connection. Furthermore, the interference fit between the external wiring terminals and slot 430 ensures a tight fit, reducing contact resistance, ensuring a low-impedance current transmission path, and improving overall system efficiency. The design of slot 430 allows for direct insertion of the external wiring terminals, eliminating the need for complex tools or steps, significantly simplifying the installation process and reducing operational complexity. Inspection or replacement can be performed quickly, reducing downtime and improving maintenance efficiency.

[0064] In other embodiments, the fitting portion 400 may be connected to the crimping portion 100 .

[0065] In one embodiment, see Figure 2 and Figure 3 , the matching portion 400, the connecting portion 200 and the crimping portion 100 are formed as one body.

[0066] The mating portion 400, the connecting portion 200 and the crimping portion 100 are manufactured into an integral structure through a one-step molding process. The one-piece molding design avoids the seams and solder joints in the traditional multi-component assembly method, which are often the weakest links in the structure that are most prone to breakage or failure. The one-piece molding structure is stronger and can withstand greater mechanical stress. It can better disperse vibration energy and prevent damage caused by local stress concentration. Since there are no additional connection points or interfaces, there is almost no risk of increased impedance in the entire internal transmission path of the puncture crimping terminal 10, thereby reducing contact resistance and improving electrical efficiency. The use of an one-piece molding process can significantly reduce the number of manufacturing steps, shorten the production cycle, and reduce production costs. The product has higher dimensional accuracy and quality consistency, reducing product defects caused by assembly errors.

[0067] In other embodiments, the matching portion 400 may be connected to the connecting portion 200 and / or the crimping portion 100 by welding, clamping, or the like.

[0068] In one embodiment, see Figure 1 Each groove 310 sequentially connects one of the crimping portions 100 , the connecting portion 200 and another crimping portion 100 .

[0069] Grooves 310 are formed on the inner sides of the connecting portion 200 and the two crimping portions 100, which increase the contact area and puncture point between the terminal teeth 320 and the enameled wire 20, thereby improving the puncture and crimping effect of the puncture and crimping terminal 10 on the enameled wire 20. The design of the grooves 310 connecting each part in sequence allows the stress to be evenly distributed throughout the terminal structure, avoiding breakage or damage caused by local stress concentration, and enhancing the mechanical rigidity and stability of the entire terminal. The thickness of the connecting portion 200 can be the same as or different from that of the crimping portion 100. The thickness of the connecting portion 200 is also denoted as D. When the thickness of the connecting portion 200 is different from that of the crimping portion 100, the connecting portion 200 and the terminal teeth 320 formed on the connecting portion 200 also satisfy 0.14≤L / D≤0.46.

[0070] In other embodiments, the grooves 310 on the connecting portion 200 and the two crimping portions 100 may also be staggered.

[0071] In one embodiment, see Figure 4 and Figure 5 A spike portion 330 is provided on the end surface of the terminal tooth 320 facing the inner side of the accommodating groove 300 , and the spike portion 330 extends along the extending direction of the groove 310 .

[0072] The spikes 330 are provided on the end surface of the terminal teeth 320 facing the inside of the receiving slot 300. These spikes 330 provide additional puncturing force, helping to pierce the paint film on the enameled wire 20. This further enhances the ability to pierce the paint film on the enameled wire 20, improving the reliability and stability of the electrical connection. The spikes 330 provide stronger puncturing force during the initial crimping phase, helping to quickly penetrate the paint film on the surface of the enameled wire 20. This significantly improves the success rate of puncturing thicker or harder paint films. The spikes 330 create multiple puncture points on each terminal tooth 320, increasing the probability of paint film damage and thus improving overall conductivity reliability. The spikes 330 evenly distribute stress during the puncture process, preventing damage or breakage of the enameled wire 20 due to excessive localized stress. The spikes 330 ensure effective puncture while preventing excessive mechanical stress on the enameled wire 20, thereby reducing the risk of wire breakage. The end surface of each terminal tooth 320 may be provided with a single spike portion 330 or multiple spike portions 330 may be provided at intervals. Optionally, the end surface of each terminal tooth 320 is provided with two spike portions 330 , and the two spike portions 330 are distributed along the extension direction of the enameled wire 20 .

[0073] In one embodiment, see Figure 4 and Figure 5 The spike portion 330 is conical, and the tip of the spike portion 330 faces the inside of the accommodating groove 300.

[0074] The spike portion 330 is conical, and its conical design gives the spike portion 330 a sharp tip that points to the inside of the receiving groove 300, ensuring that during the crimping process, the spike portion 330 can first contact the enameled wire 20 and begin to puncture the paint film on its surface. The conical spike portion 330 can concentrate stress on a smaller contact area, making it easier to penetrate the paint film of the enameled wire 20, making the puncture process more efficient. The conical spike portion 330 on each terminal tooth 320 can form multiple independent puncture points, increasing the probability of the paint film being damaged, thereby improving the overall conduction reliability. The conical structure of the spike portion 330 gives it a larger base and a gradually tapering tip, which helps to provide sufficient support force during the puncture process and prevent the spike portion 330 from deforming or breaking.

[0075] The present invention also proposes a motor, which includes an enameled wire 20 and a piercing crimping terminal 10. The specific structure of the piercing crimping terminal 10 refers to the above embodiment. Since this motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0076] In one embodiment, see Figures 1 to 3The cross-sectional area of ​​the enameled wire 20 is S, the number of the terminal teeth 320 is n, and S and n satisfy: S / n≤0.22.

[0077] The cross-sectional area of ​​the enameled wire 20 refers to the cross-sectional area measured by a plane perpendicular to the extension direction of the enameled wire 20. The number n of terminal teeth 320 refers to the number of terminal teeth 320 distributed on the crimping portion 100 (n = m2 + m1). The ratio S / n represents the cross-sectional area of ​​the enameled wire 20 corresponding to each terminal tooth 320. Specifically, when the enameled wire 20 is thicker, i.e., its cross-sectional area is larger, more terminal teeth 320 are required to ensure effective puncture and contact. Conversely, when the enameled wire 20 is thinner, i.e., its cross-sectional area is smaller, fewer terminal teeth 320 can also meet the puncture requirements. A smaller S / n ratio means more terminal teeth 320 are involved in the puncture process, increasing the number of puncture points and improving conductivity reliability. Each terminal tooth 320 covers a smaller cross-sectional area of ​​the enameled wire 20, which more evenly distributes the mechanical stress during the puncture and clamping process across the entire enameled wire 20, reducing the risk of damage or breakage of the enameled wire 20 caused by localized stress concentration. At the same time, more terminal teeth 320 can provide more metal contact points, reduce contact resistance, improve current transmission efficiency, and effectively prevent overheating or energy loss caused by poor contact.

[0078] By controlling S / n≤0.22, it can be ensured that each terminal tooth 320 is responsible for puncturing a relatively small cross-sectional area of ​​the enameled wire 20, thereby achieving a more uniform puncture effect, helping to avoid local non-puncture situations, and ensuring that all conductors can effectively contact. By adjusting the S / n value, it is possible to flexibly cope with enameled wires 20 of different diameters. For thicker enameled wires 20, the number of terminal teeth 320 is increased to ensure sufficient puncture points; for thinner enameled wires 20, the number of terminal teeth 320 can be appropriately reduced to avoid damage caused by excessive clamping, thereby ensuring that each connection can achieve the best puncture effect and adapt to various paint film characteristics. Among them, according to the different cross-sectional area of ​​the enameled wire 20, the number n of terminal teeth 320 is rounded up. The cross-sectional area of ​​the enameled wire 20 is 1.0mm 2 , taking S / n=0.22 as an example, n is rounded up to 5, which means that at least 5 terminal teeth 320 are required to ensure effective puncture and contact.

[0079] In other embodiments, S and n may satisfy: 0.22<S / n≤0.26.

[0080] In one embodiment, 5≤n≤9.

[0081] When the number of terminal teeth 320 satisfies 5≤n≤9, each terminal tooth 320 is responsible for puncturing a relatively small cross-sectional area of ​​the enameled wire 20, thereby achieving a more uniform puncture effect, helping to avoid partial non-punctures and ensuring effective contact of all conductors. This ensures the number of puncture points, improves conduction reliability, reduces contact resistance, and improves current transmission efficiency. By setting the number of terminal teeth 320 to 5≤n≤9 and combining the ratio of the cross-sectional area of ​​the enameled wire 20 to the number of terminal teeth 320, S / n≤0.22, the puncture crimping terminal 10 can optimize electrical performance and mechanical reliability while ensuring a good puncture effect.

[0082] In other implementations, n=3, or n=4; or 10≤n≤12.

[0083] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since this compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0084] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A puncture crimping terminal, characterized in that: It includes two relatively spaced crimping parts and a connecting part connecting the two crimping parts. The two crimping parts and the connecting part jointly form a receiving groove for the enameled wire to pass through. The inner wall of the receiving groove is formed with a plurality of spaced grooves. The grooves are formed on at least the inner sides of the two crimping parts. Terminal teeth are formed between two adjacent grooves. The terminal teeth are used to pierce the enameled wire. The thickness of the crimping part is D, and the height of the terminal teeth is L. L and D satisfy: 0.14≤L / D≤0.

46.

2. The piercing crimping terminal according to claim 1, wherein: L≥0.08mm; and / or, 0.4mm≤D≤0.57mm.

3. The piercing crimping terminal according to claim 1, wherein: The crimping portion has a first crimping area and a second crimping area, the terminal teeth include a first tooth portion provided in the first crimping area and a second tooth portion provided in the second crimping area, the height of the first tooth portion is L1, the height of the second tooth portion is L2, and L1 and L2 satisfy: L1≥L2.

4. The piercing crimping terminal according to claim 3, wherein: The number of the first tooth portions is m1, the number of the second tooth portions is m2, and m1 and m2 satisfy: m1>m2.

5. The piercing crimping terminal according to claim 4, wherein: m2 / (m2+m1)≤0.

23.

6. The piercing crimping terminal according to claim 3, wherein: The puncture crimping terminal further includes a matching portion, which is provided on a side of the first crimping area away from the second crimping area and connected to the connecting portion, and is used to connect to an external terminal.

7. The piercing crimping terminal according to claim 6, wherein: The matching portion includes a bottom plate and a plurality of side plates, the bottom plate is connected to the connecting portion, the side plates are connected to the edge of the bottom plate, and the bottom plate and the side plates together enclose a slot for inserting the external terminal.

8. The piercing crimping terminal according to claim 6, wherein: The matching portion, the connecting portion and the crimping portion are formed as one body.

9. The piercing crimping terminal according to claim 1, wherein: Each of the grooves sequentially connects one of the crimping portions, the connecting portion and another of the crimping portions.

10. The piercing crimping terminal according to any one of claims 1 to 9, characterized in that: A spike portion is provided on an end surface of the terminal tooth facing the inner side of the accommodating groove, and the spike portion extends along the extending direction of the groove.

11. The piercing crimping terminal according to claim 10, wherein: The spike portion is tapered, and the tip of the spike portion faces the inner side of the accommodating groove.

12. A motor, characterized in that: The invention comprises an enameled wire and the piercing crimping terminal according to any one of claims 1 to 11.

13. The motor according to claim 12, wherein: The cross-sectional area of ​​the enameled wire is S, the number of the terminal teeth is n, and S and n satisfy: S / n≤0.

22.

14. The motor according to claim 13, wherein 5≤n≤9。 15. A compressor, characterized in that: Comprising the motor as claimed in claim 14.

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