A pin-type starting thermal protector and its PTC chip assembly equipment

Abstract

This utility model relates to a pin-type starting thermal protector and its PTC chip assembly equipment, belonging to the field of starting thermal protectors. The utility model includes a thermal protector, a cover plate, a first pin, a connecting tab, a double tab, a second pin, a bidirectional thyristor, a third spring, a second thermistor, a fourth spring, a base, and a PTC chip assembly. The PTC chip assembly includes a second pin, a first pin, a first thermistor, a first spring, and a second spring. The thermal protector is mounted on the base. The first pin is connected to the connecting tab, the second pin is connected to the first pin, the first pin is connected to the double tab, and the second, second, third, and fourth springs are all connected to the bidirectional thyristor. The third and fourth springs are respectively connected to the two poles of the second thermistor, and the first pin, first spring, and second spring are respectively connected to the two poles of the first thermistor.

Description

Technical Field

[0001] This utility model relates to a pin-type starter thermal protector and its PTC chip assembly equipment, belonging to the field of starter thermal protectors, and is mainly applicable to the starting and protection of refrigeration compressor motors in refrigerators, freezers, and other refrigerators or general single-phase AC motors. Background Technology

[0002] Most refrigeration compressors use split-phase single-phase asynchronous motors, whose stator cores have two sets of windings: a main winding and an auxiliary winding. After energization, the main and auxiliary magnetic fields generated by the main and auxiliary windings have a phase difference, forming a rotating magnetic field. This rotating magnetic field cuts the stationary rotor to generate electromagnetic torque, causing the rotor to start rotating. The rotor torque gradually increases after startup. When the speed reaches 75%-80% of the synchronous speed, the auxiliary winding circuit is disconnected. At this time, under the action of the main magnetic field, the motor can continue to accelerate until it reaches equilibrium with the external impedance and operates stably. Starters are often used in conjunction with thermal protectors. By installing a thermal protector on the starter base, the compressor is protected against overcurrent and overtemperature. The starter's main function is to use a thermistor, i.e., a PTC chip, to complete the starting process. A PTC starter is connected in series in the auxiliary winding circuit of the refrigeration compressor motor. At room temperature, it is in a low-resistance conducting state. During startup, the current causes the PTC chip element to heat up rapidly. When it reaches the Curie temperature, its resistance value rapidly increases to tens of kilohms or more, and the auxiliary winding circuit current drops to below tens of milliamperes, maintaining a power consumption of about 3W, which is close to an open circuit state. The motor starts up and enters normal operation. The thermal protector mainly protects the motor from overcurrent and overtemperature.

[0003] The PTC chip elements currently in use are made of rare earth elements and have a silver coating to ensure good conductivity. In actual assembly of PTC starters, the springs and other parts are placed into the base one by one, and then the PTC chip element is placed between the two springs. This assembly method is very easy to damage the silver layer of the PTC chip element, causing poor contact. When current passes through, it will spark and shatter the PTC chip element. Currently, the publicly available patent application CN202223338495.8 describes a low-power starter with a pin-insertion device. While its PTC chip installation method uses a baffle bar to apply pressure, preventing scratches on the silver surfaces of the PTC chip and providing short-circuit protection, a short-circuit risk still exists if the PTC chip is damaged and not in the center due to other reasons. Furthermore, in the aforementioned low-power starter, the first and second thermistors are connected in parallel, requiring the PTC chip assembly to occupy a large space. This also places the first thermistor on the side of the base rather than in the center, making it susceptible to damage and affecting its lifespan when the starter thermal protector is subjected to external force. The publicly available patent application CN202121830501.4 describes a three-point contact PTC starter, which provides better short-circuit protection by using a three-point contact method for the PTC chip. However, this method also suffers from the aforementioned problem of damaging the silver surface of the PTC chip during installation. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a pin-type starter thermal protector with a reasonable structural design and its PTC chip assembly equipment.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows: This pin-type starting thermal protector includes a thermal protector, a cover plate, a first pin, a connecting tab, a double-ended tab, a second pin, a bidirectional thyristor, a third spring, a second thermistor, a fourth spring, a base, and a PTC chip assembly. The PTC chip assembly includes a second pin, a first pin, a first thermistor, a first spring, and a second spring. The thermal protector is mounted on the base. Its structural features are: the first pin is connected to the connecting tab, the second pin is connected to the first pin, the first pin is connected to the double-ended tab, the second spring, the second pin, the third spring, and the fourth spring are all connected to the bidirectional thyristor, the third spring and the fourth spring are respectively connected to the two poles of the second thermistor, the first pin and the first and second springs are respectively connected to the two poles of the first thermistor, and the double-ended tab and the connecting tab are independently set and have no connection relationship.

[0006] Furthermore, the first thermistor, the second reed, the bidirectional thyristor, the fourth reed, and the second thermistor are connected in series.

[0007] Furthermore, the PTC chip assembly also includes an electrical connector, the first pin is connected to the electrical connector, and the electrical connector is connected to the first thermistor.

[0008] Furthermore, the first pin, connecting tab, second pin, first pin, dual tab, first thermistor, first spring, second spring, second pin, bidirectional thyristor, third spring, second thermistor and fourth spring are all installed in the cavity formed by the cover plate and the base.

[0009] Furthermore, the electrical connector is installed in the cavity formed by the cover plate and the base.

[0010] Furthermore, a PTC chip assembly mounting cavity is provided in the middle of the base, and the PTC chip assembly is installed in the PTC chip assembly mounting cavity.

[0011] Furthermore, another technical objective of this utility model is to provide a PTC chip assembly equipment for assembling PTC chip components.

[0012] The above-mentioned technical objective of this utility model is achieved through the following technical solution.

[0013] A PTC chip assembly equipment for assembling PTC chip components is characterized in that: the PTC chip assembly equipment includes a pressing mechanism, a first placement mechanism and a second placement mechanism, the pressing mechanism is located above the first placement mechanism and the second placement mechanism, and the pressing mechanism cooperates with the first placement mechanism and the second placement mechanism when the first placement mechanism and the second placement mechanism are closed.

[0014] Furthermore, the pressing mechanism includes a cylinder and a rubber pad, the piston rod of the cylinder is connected to the rubber pad, and a first sensor and a second sensor are installed on the cylinder barrel of the cylinder.

[0015] Furthermore, the first placement mechanism includes a second cylinder, a sliding plate, a first guide post, a first spring, a first guide block, a first base cavity, a first pin placement cavity, a first pin limiting post, and a first thermistor placement cavity. The piston rod of the second cylinder is connected to the sliding plate. Sensors No. 3 and No. 4 are installed on the cylinder barrel of the second cylinder. The first guide post is installed on the sliding plate. The first guide block is installed on the first guide post. The first spring is fitted outside the first guide post, and both ends of the first spring abut against the sliding plate and the first guide block, respectively. The first guide block is provided with a first base cavity, a first pin placement cavity, and a first thermistor placement cavity. One end of the first pin limiting post is fixed on the sliding plate, and the other end of the first pin limiting post is located in the first pin placement cavity.

[0016] Furthermore, the second placement mechanism includes a base plate, a track, two guide pillars, two springs, two guide blocks, a base cavity, a first spring placement cavity, a second spring placement cavity, a second thermistor placement cavity, a first thermistor limiting post, a second spring limiting post, and a first spring limiting post. The first placement mechanism is mounted on the base plate via the track. The two guide pillars are mounted on the base plate. The two guide blocks are mounted on the two guide pillars. The two springs are fitted around the two guide pillars, and both ends of the two springs abut against the base plate and the two guide blocks, respectively. The two guide blocks are provided with a base cavity, a first spring placement cavity, a second spring placement cavity, and a second thermistor placement cavity. One end of each of the first thermistor limiting post, the second spring limiting post, and the first spring limiting post is fixed to the base plate. The other ends of each of the first thermistor limiting post, the second spring limiting post, and the first spring limiting post are located inside the second thermistor placement cavity, the second spring placement cavity, and the first spring placement cavity, respectively.

[0017] Compared with existing technologies, this utility model has the following advantages: This pin-type starter thermal protector uses a three-point short-circuit protection contact PTC chip element. When the PTC starter malfunctions and the first thermistor breaks, the first spring contact, under elastic force, pushes the broken thermistor apart, ensuring no power is supplied between the first pin contact, the second spring contact, and the first thermistor, thus cutting off the power circuit and improving safety and reliability. During installation, the first thermistor, along with the first pin, first spring contact, and second spring contact, is assembled into the base in one go using PTC chip assembly equipment. This avoids damage to the silver surface of the first thermistor, ensuring good contact and conductivity, and extending its service life.

[0018] In other words, by adopting a three-point short-circuit protection structure combined with a one-time assembly method, the problems of short circuits and PTC chip component damage in existing technologies are solved. At the same time, the first and second thermistors are arranged in series, which reduces internal space, lowers costs, improves production efficiency, and further improves product quality and service life. Since the first and second thermistors are connected in series, the first thermistor can be placed in the middle of the base, thus avoiding damage to the first thermistor due to external impacts or drops from the starting thermal protector. Attached Figure Description

[0019] Figure 1 This is an exploded structural diagram of the pin-type starting thermal protector of Embodiment 1 of this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of the pin-type starter thermal protector of Embodiment 1 of this utility model.

[0021] Figure 3This is a three-dimensional structural diagram of the pin-type starting thermal protector in embodiments 1 and 2 of this utility model. Figure 1 .

[0022] Figure 4 This is a three-dimensional structural diagram of the pin-type starting thermal protector in embodiments 1 and 2 of this utility model. Figure 2 .

[0023] Figure 5 This is a three-dimensional structural diagram of the pin-type starting thermal protector (with the cover plate removed) according to Embodiment 1 of this utility model.

[0024] Figure 6 This is a three-dimensional structural diagram of the base of Embodiment 1 of this utility model.

[0025] Figure 7 This is a three-dimensional structural diagram of the base of embodiments 1 and 2 of this utility model.

[0026] Figure 8 This is a three-dimensional structural diagram of the cover plate in embodiments 1 and 2 of this utility model.

[0027] Figure 9 This is a three-dimensional structural diagram of the first pin and connecting insert in embodiments 1 and 2 of this utility model.

[0028] Figure 10 This is a three-dimensional structural diagram of the second pin and the first pin of Embodiment 1 of this utility model.

[0029] Figure 11 This is a three-dimensional structural diagram of the double insert of Embodiments 1 and 2 of this utility model.

[0030] Figure 12 This is a three-dimensional structural schematic diagram of the first reed in embodiments 1 and 2 of this utility model.

[0031] Figure 13 This is a three-dimensional structural diagram of the second reed in embodiments 1 and 2 of this utility model.

[0032] Figure 14 This is a three-dimensional structural diagram of the second pin in embodiments 1 and 2 of this utility model.

[0033] Figure 15 This is a three-dimensional structural diagram of the bidirectional thyristor in embodiments 1 and 2 of this utility model.

[0034] Figure 16 This is a three-dimensional structural diagram of the third reed in embodiments 1 and 2 of this utility model.

[0035] Figure 17 This is a three-dimensional structural diagram of the fourth reed in embodiments 1 and 2 of this utility model.

[0036] Figure 18 This is an exploded structural diagram of the pin-type starting thermal protector of Embodiment 2 of this utility model.

[0037] Figure 19 This is a schematic diagram of the internal structure of the pin-type starting thermal protector of Embodiment 2 of this utility model.

[0038] Figure 20 This is a three-dimensional structural diagram of the pin-type starting thermal protector (with the cover plate removed) according to Embodiment 2 of this utility model.

[0039] Figure 21 This is a three-dimensional structural diagram of the base of Embodiment 2 of this utility model.

[0040] Figure 22 This is a three-dimensional structural diagram of the second pin and the first pin of Embodiment 2 of this utility model.

[0041] Figure 23 This is a three-dimensional structural diagram of the electrical connector of Embodiment 2 of this utility model.

[0042] Figure 24 This is a three-dimensional structural diagram of the PTC chip assembly equipment of Embodiment 3 of this utility model.

[0043] Figure 25 This is a three-dimensional structural diagram of the pressing mechanism of Embodiment 3 of this utility model.

[0044] Figure 26 This is a three-dimensional structural diagram of the first placement mechanism in Embodiment 3 of this utility model.

[0045] Figure 27 This is a three-dimensional structural diagram of the second placement mechanism in Embodiment 3 of this utility model.

[0046] Figure 28 This is a schematic diagram of the internal structure of the PTC chip assembly equipment according to Embodiment 3 of this utility model.

[0047] Figure 29 This is a schematic diagram of the internal structure of the PTC chip assembly equipment according to Embodiment 3 of this utility model.

[0048] In the diagram: 1. Thermal protector; 2. Cover plate; 3. First pin; 4. Connecting tab; 5. Second pin; 6. First lead; 7. Double tab; 8. First thermistor; 9. First spring; 10. Second spring; 11. Second lead; 12. Bidirectional thyristor; 13. Third spring; 14. Second thermistor; 15. Fourth spring; 16. Base; 17. Electrical connector. First socket 2-1, second socket 2-2, first latch 2-3, second latch 2-4, connecting tab limiting block 2-5, first pin limiting block 2-6, second pin limiting block 2-7, first thermistor limiting block 2-8, fourth spring limiting block 2-9, second thermistor limiting block 2-10, bidirectional thyristor limiting block 2-11. Bracket 1 (4-1), Bracket 2 (4-2), Connecting insert body (4-3) First pin hole 6-1, first pin contact 6-2, output terminal 6-3, bracket number three 6-4, bracket number four 6-5 Double-joint insert first body 7-1, double-joint insert second body 7-2, connecting end 7-3. First spring contact 9-1 Second reed holder 10-1, second reed contact 10-2 Second pin hole 11-1, second pin bracket 11-2, second pin body 11-3 First electrode 12-1, Second electrode 12-2, Trigger electrode 12-3 Third reed holder 13-1, third reed contact 13-2 Fourth reed holder 15-1, fourth reed contact 15-2, Thermal protector mounting cavity 16-1, mounting elastic claw 16-2, first guide block 16-3, second guide block 16-4, first guide surface 16-5, second guide surface 16-6, third guide surface 16-7, fourth guide surface 16-8, first locking hole 16-9, second locking hole 16-10, foolproof socket 16-11, anti-pull-out claw 16-12, second pin mounting cavity 16-13, second spring mounting cavity 16-14 The following components are included: 16-15 (bidirectional thyristor mounting cavity), 16-16 (first spring mounting cavity), 16-17 (third spring mounting cavity), 16-18 (second thermistor mounting cavity), 16-19 (fourth spring mounting cavity), 16-20 (second pin mounting cavity), 16-21 (first pin mounting cavity), 16-22 (connecting tab mounting cavity), 16-23 (first pin mounting cavity), 16-24 (first thermistor mounting cavity), and 16-25 (electrical connector mounting cavity). Electrical connector contact 17-1, Electrical connector contact 217-2 Pressing mechanism A, First placement mechanism B, Second placement mechanism C, Cylinder A1, Rubber Gasket A2 Cylinder B1, slide plate B2, guide post B3, spring B4, guide block B5, base cavity B6, first pin placement cavity B7, first pin limiting post B8, first thermistor placement cavity B9. Base plate C1, rail C2, guide post II C3, spring II C4, guide block II C5, base cavity II C6, first spring placement cavity C7, second spring placement cavity C8, first thermistor placement cavity II C9, first thermistor limiting post C10, second spring limiting post C11, first spring limiting post C12 Sensor 1 (SQ1), Sensor 2 (SQ2), Sensor 3 (SQ3), Sensor 4 (SQ4). Detailed Implementation

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0050] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the use of terms such as "upper," "lower," "left," "right," "middle," and "one" in this specification is merely for clarity and not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0051] Example 1 (e.g.) Figure 1-17 As shown in the figure, the pin-type starter thermal protector in this embodiment includes a thermal protector 1, a cover plate 2, a first pin 3, a connecting tab 4, a double tab 7, a second pin 11, a bidirectional thyristor 12, a third spring 13, a second thermistor 14, a fourth spring 15, a base 16, and a PTC chip assembly. The PTC chip assembly includes a second pin 5, a first pin 6, a first thermistor 8, a first spring 9, and a second spring 10. The thermal protector 1 is mounted on the base 16.

[0052] In this embodiment, the first pin 3 is connected to the connecting tab 4, the second pin 5 is connected to the first pin 6, the first pin 6 is connected to the double-ended tab 7, the second spring 10, the second pin 11, the third spring 13 and the fourth spring 15 are all connected to the bidirectional thyristor 12, the third spring 13 and the fourth spring 15 are respectively connected to the two poles of the second thermistor 14, the first pin 6 and the first spring 9 and the second spring 10 are respectively connected to the two poles of the first thermistor 8, the double-ended tab 7 and the connecting tab 4 are independently set and have no connection relationship, and the first thermistor 8, the second spring 10, the bidirectional thyristor 12, the fourth spring 15 and the second thermistor 14 are connected in series.

[0053] In this embodiment, the first pin 3, connecting tab 4, second pin 5, first pin 6, dual tab 7, first thermistor 8, first spring 9, second spring 10, second pin 11, bidirectional thyristor 12, third spring 13, second thermistor 14 and fourth spring 15 are all installed in the cavity formed by the cover plate 2 and the base 16. The base 16 has a PTC chip assembly mounting cavity in the middle, and the PTC chip assembly is installed in the PTC chip assembly mounting cavity.

[0054] The base 16 is provided with a thermal protector mounting cavity 16-1, a mounting elastic claw 16-2, a first locking hole 16-9, a second locking hole 16-10, and a foolproof socket 16-11. The mounting elastic claw 16-2 is located inside the thermal protector mounting cavity 16-1. The inner walls on both sides of the thermal protector mounting cavity 16-1 are respectively provided with a first guide block 16-3 and a second guide block 16-4. The first guide block 16-3 is provided with a first guide surface 16-5 and a second guide surface 16-6. The second guide block 16-4 is provided with a third guide surface 16-7 and a fourth guide surface 16-8. The foolproof socket 16-11 is provided with an anti-pull-out claw 16-12.

[0055] The base 16 internally comprises a second pin mounting cavity 16-13, a second spring mounting cavity 16-14, a bidirectional thyristor mounting cavity 16-15, a first spring mounting cavity 16-16, a third spring mounting cavity 16-17, a second thermistor mounting cavity 16-18, a fourth spring mounting cavity 16-19, a second pin mounting cavity 16-20, a first pin mounting cavity 16-21, a connecting insert mounting cavity 16-22, a first pin mounting cavity 16-23, and a first thermistor mounting cavity 16-24. The second spring mounting cavity 16-14 and the bidirectional thyristor mounting cavity 16-15 are interconnected, with the second spring mounting cavity 16-14 located on one side of the bidirectional thyristor mounting cavity 16-15. The third spring mounting cavity 16-17 and the second thermistor mounting cavity... 16-18 and the fourth spring mounting cavity 16-19 are connected, and the second thermistor mounting cavity 16-18 is located in the middle of the third spring mounting cavity 16-17 and the fourth spring mounting cavity 16-19. The second pin mounting cavity 16-20 and the first pin mounting cavity 16-23 are connected. The first pin mounting cavity 16-21 and the connecting insert mounting cavity 16-22 are connected. The second pin mounting cavity 16-20 and the first pin mounting cavity 16-23 are independently and separately arranged from the first pin mounting cavity 16-21 and the connecting insert mounting cavity 16-22. The first thermistor mounting cavity 16-24 is located to the right of the second pin mounting cavity 16-20 and the first pin mounting cavity 16-23, and to the left of the second spring mounting cavity 16-14 and the first spring mounting cavity 16-16.

[0056] The cover plate 2 is provided with a first insertion hole 2-1, a second insertion hole 2-2, a first latch 2-3, a second latch 2-4, a connecting insert limiting block 2-5, a first pin limiting block 2-6, a second pin limiting block 2-7, a first thermistor limiting block 2-8, a fourth spring limiting block 2-9, a second thermistor limiting block 2-10, and a bidirectional thyristor limiting block 2-11. The first insertion hole 2-1 and the second insertion hole 2-2 are respectively provided with the second pin hole 11-1 and the first pin hole 6-1. The first latch 2-3... The second hook 2-4 engages with the second clip hole 16-10 and the first clip hole 16-9 respectively. The connecting insert limiting block 2-5, the first pin limiting block 2-6, the second pin limiting block 2-7, the first thermistor limiting block 2-8, the fourth spring limiting block 2-9, the second thermistor limiting block 2-10 and the bidirectional thyristor limiting block 2-11 respectively restrict and fix the connecting insert 4, the first pin 3, the second pin 5, the first thermistor 8, the fourth spring 15, the second thermistor 14 and the bidirectional thyristor 12.

[0057] The second pin 11 is provided with a second pin hole 11-1, a second pin bracket 11-2, and a second pin body 11-3. The second pin bracket 11-2 is connected to the bidirectional thyristor 12.

[0058] The second reed 10 is provided with a second reed frame 10-1 and a second reed contact 10-2. The second reed frame 10-1 is connected to the bidirectional thyristor 12, and the second reed contact 10-2 is connected to one side of the first thermistor 8.

[0059] The third reed 13 is provided with a third reed frame 13-1 and a third reed contact 13-2. The third reed frame 13-1 is connected to the bidirectional thyristor 12, and the third reed contact 13-2 is connected to one side of the second thermistor 14.

[0060] The fourth reed 15 is provided with a fourth reed frame 15-1 and a fourth reed contact 15-2. The fourth reed frame 15-1 is connected to the bidirectional thyristor 12, and the fourth reed contact 15-2 is connected to the other side of the second thermistor 14.

[0061] The first reed 9 is provided with a first reed contact 9-1, which is connected to one side of the first thermistor 8.

[0062] The bidirectional thyristor 12 is provided with a first electrode 12-1, a second electrode 12-2 and a trigger electrode 12-3. The first electrode 12-1, the trigger electrode 12-3 and the second electrode 12-2 are respectively connected to the second pin 11, the third spring 13 and the second spring 10 and the fourth spring 15.

[0063] The double-pin 7 is provided with a first double-pin body 7-1, a second double-pin body 7-2 and a connecting end 7-3, and the connecting end 7-3 is connected to the first pin 6.

[0064] The first pin 6 is provided with a first pin hole 6-1, a first pin contact 6-2, an output terminal 6-3, a third bracket 6-4, and a fourth bracket 6-5. The first pin contact 6-2 is connected to the other side of the first thermistor 8, the output terminal 6-3 is connected to the double-gang connector 7, and the third bracket 6-4 and the fourth bracket 6-5 are connected to the second pin 5.

[0065] The connecting insert 4 is provided with a first bracket 4-1, a second bracket 4-2 and a connecting insert body 4-3. The first bracket 4-1 and the second bracket 4-2 are connected to the first pin 3.

[0066] Example 2 (e.g.) Figure 3-4 As shown in Figures 7-8 and 11-23, the pin-type starting thermal protector in this embodiment includes a thermal protector 1, a cover plate 2, a first pin 3, a connecting tab 4, a double tab 7, a second pin 11, a bidirectional thyristor 12, a third spring 13, a second thermistor 14, a fourth spring 15, a base 16, and a PTC chip assembly. The PTC chip assembly includes a second pin 5, a first pin 6, a first thermistor 8, a first spring 9, a second spring 10, and an electrical connector 17. The thermal protector 1 is mounted on the base 16.

[0067] In this embodiment, the first pin 3 is connected to the connecting tab 4, the second pin 5 is connected to the first pin 6, the first pin 6 is connected to the double-ended tab 7 and the electrical connector 17, the second spring 10, the second pin 11, the third spring 13 and the fourth spring 15 are all connected to the bidirectional thyristor 12, the third spring 13 and the fourth spring 15 are respectively connected to the two poles of the second thermistor 14, the electrical connector 17 and the first spring 9 and the second spring 10 are respectively connected to the two poles of the first thermistor 8, the double-ended tab 7 and the connecting tab 4 are independently set and have no connection relationship, and the first thermistor 8, the second spring 10, the bidirectional thyristor 12, the fourth spring 15 and the second thermistor 14 are connected in series.

[0068] In this embodiment, the first pin 3, connecting tab 4, second pin 5, first pin 6, double tab 7, first thermistor 8, first spring 9, second spring 10, second pin 11, bidirectional thyristor 12, third spring 13, second thermistor 14, fourth spring 15, and electrical connector 17 are all installed in the cavity formed by the cover plate 2 and the base 16. The base 16 has a PTC chip assembly mounting cavity in the middle, and the PTC chip assembly is installed in the PTC chip assembly mounting cavity.

[0069] The base 16 is provided with a thermal protector mounting cavity 16-1, a mounting elastic claw 16-2, a first locking hole 16-9, a second locking hole 16-10, and a foolproof socket 16-11. The mounting elastic claw 16-2 is located inside the thermal protector mounting cavity 16-1. The inner walls on both sides of the thermal protector mounting cavity 16-1 are respectively provided with a first guide block 16-3 and a second guide block 16-4. The first guide block 16-3 is provided with a first guide surface 16-5 and a second guide surface 16-6. The second guide block 16-4 is provided with a third guide surface 16-7 and a fourth guide surface 16-8. The foolproof socket 16-11 is provided with an anti-pull-out claw 16-12.

[0070] The base 16 internally comprises a second pin mounting cavity 16-13, a second spring mounting cavity 16-14, a bidirectional thyristor mounting cavity 16-15, a first spring mounting cavity 16-16, a third spring mounting cavity 16-17, a second thermistor mounting cavity 16-18, a fourth spring mounting cavity 16-19, a second pin mounting cavity 16-20, a first pin mounting cavity 16-21, a connecting plate mounting cavity 16-22, a first pin mounting cavity 16-23, a first thermistor mounting cavity 16-24, and an electrical connector mounting cavity 16-25. The second spring mounting cavity 16-14 and the bidirectional thyristor mounting cavity 16-15 are interconnected, with the second spring mounting cavity 16-14 located on one side of the bidirectional thyristor mounting cavity 16-15. The third spring mounting cavity 16-17, the second thermistor mounting cavity 16-18, and the fourth spring mounting cavity 16-19 are also interconnected. The spring mounting cavity 16-19 is through, and the second thermistor mounting cavity 16-18 is located in the middle of the third spring mounting cavity 16-17 and the fourth spring mounting cavity 16-19. The second pin mounting cavity 16-20 and the first pin mounting cavity 16-23 are through, the first pin mounting cavity 16-23 and the connecting piece mounting cavity 16-25 are through, the first pin mounting cavity 16-21 and the connecting piece mounting cavity 16-22 are through, the second pin mounting cavity 16-20 and the first pin mounting cavity 16-23 are independently and separately arranged from the first pin mounting cavity 16-21 and the connecting piece mounting cavity 16-22, and the first thermistor mounting cavity 16-24 is located to the right of the second pin mounting cavity 16-20 and the first pin mounting cavity 16-23, and to the left of the second spring mounting cavity 16-14 and the first spring mounting cavity 16-16.

[0071] The cover plate 2 is provided with a first insertion hole 2-1, a second insertion hole 2-2, a first latch 2-3, a second latch 2-4, a connecting insert limiting block 2-5, a first pin limiting block 2-6, a second pin limiting block 2-7, a first thermistor limiting block 2-8, a fourth spring limiting block 2-9, a second thermistor limiting block 2-10, and a bidirectional thyristor limiting block 2-11. The first insertion hole 2-1 and the second insertion hole 2-2 are respectively provided with the second pin hole 11-1 and the first pin hole 6-1. The first latch 2-3... The second hook 2-4 engages with the second clip hole 16-10 and the first clip hole 16-9 respectively. The connecting insert limiting block 2-5, the first pin limiting block 2-6, the second pin limiting block 2-7, the first thermistor limiting block 2-8, the fourth spring limiting block 2-9, the second thermistor limiting block 2-10 and the bidirectional thyristor limiting block 2-11 respectively restrict and fix the connecting insert 4, the first pin 3, the second pin 5, the first thermistor 8, the fourth spring 15, the second thermistor 14 and the bidirectional thyristor 12.

[0072] The second pin 11 is provided with a second pin hole 11-1, a second pin bracket 11-2, and a second pin body 11-3. The second pin bracket 11-2 is connected to the bidirectional thyristor 12.

[0073] The second reed 10 is provided with a second reed frame 10-1 and a second reed contact 10-2. The second reed frame 10-1 is connected to the bidirectional thyristor 12, and the second reed contact 10-2 is connected to one side of the first thermistor 8.

[0074] The third reed 13 is provided with a third reed frame 13-1 and a third reed contact 13-2. The third reed frame 13-1 is connected to the bidirectional thyristor 12, and the third reed contact 13-2 is connected to one side of the second thermistor 14.

[0075] The fourth reed 15 is provided with a fourth reed frame 15-1 and a fourth reed contact 15-2. The fourth reed frame 15-1 is connected to the bidirectional thyristor 12, and the fourth reed contact 15-2 is connected to the other side of the second thermistor 14.

[0076] The first reed 9 is provided with a first reed contact 9-1, which is connected to one side of the first thermistor 8.

[0077] The bidirectional thyristor 12 is provided with a first electrode 12-1, a second electrode 12-2 and a trigger electrode 12-3. The first electrode 12-1, the trigger electrode 12-3 and the second electrode 12-2 are respectively connected to the second pin 11, the third spring 13 and the second spring 10 and the fourth spring 15.

[0078] The double-pin 7 is provided with a first double-pin body 7-1, a second double-pin body 7-2 and a connecting end 7-3, and the connecting end 7-3 is connected to the first pin 6.

[0079] The first pin 6 is provided with a first pin hole 6-1, an output end 6-3, a third bracket 6-4 and a fourth bracket 6-5. The output end 6-3 is connected to the double-joint insert 7, and the third bracket 6-4 and the fourth bracket 6-5 are connected to the second pin 5.

[0080] The connecting insert 4 is provided with a first bracket 4-1, a second bracket 4-2 and a connecting insert body 4-3. The first bracket 4-1 and the second bracket 4-2 are connected to the first pin 3.

[0081] The electrical connector 17 is provided with an electrical connector contact 17-1 and an electrical connector contact 17-2. The electrical connector contact 17-1 is connected to the other side of the first thermistor 8, and the electrical connector contact 17-2 is connected to the first pin 6.

[0082] Example 3 (e.g.) Figure 24-29As shown in the figure, the PTC chip assembly equipment in this embodiment is used to assemble PTC chip components. It includes a pressing mechanism A, a first placement mechanism B, and a second placement mechanism C. The pressing mechanism A is located above the first placement mechanism B and the second placement mechanism C. When the first placement mechanism B and the second placement mechanism C are closed, the pressing mechanism A cooperates with the first placement mechanism B and the second placement mechanism C.

[0083] In this embodiment, the pressing mechanism A includes a cylinder A1 and a rubber pad A2. The piston rod of the cylinder A1 is connected to the rubber pad A2. A sensor SQ1 and a sensor SQ2 are installed on the cylinder barrel of the cylinder A1.

[0084] In this embodiment, the first placement mechanism B includes a second cylinder B1, a sliding plate B2, a first guide post B3, a first spring B4, a first guide block B5, a base cavity B6, a first pin placement cavity B7, a first pin limiting post B8, and a first thermistor placement cavity B9. The piston rod of the second cylinder B1 is connected to the sliding plate B2. Sensors SQ3 and SQ4 are installed on the cylinder barrel of the second cylinder B1. The first guide post B3 is installed on the sliding plate B2, and the first guide block B5 is installed on the first guide post B3. The first spring B4 is fitted outside the first guide post B3, and both ends of the first spring B4 abut against the sliding plate B2 and the first guide block B5, respectively. The first guide block B5 is provided with a base cavity B6, a first pin placement cavity B7, and a first thermistor placement cavity B9. One end of the first pin limiting post B8 is fixed on the sliding plate B2, and the other end of the first pin limiting post B8 is located in the first pin placement cavity B7.

[0085] In this embodiment, the second placement mechanism C includes a base plate C1, a rail C2, a second guide post C3, a second spring C4, a second guide block C5, a second base cavity C6, a first spring placement cavity C7, a second spring placement cavity C8, a second first thermistor placement cavity C9, a first thermistor limiting post C10, a second spring limiting post C11, and a first spring limiting post C12. The first placement mechanism B is mounted on the base plate C1 via the rail C2. The second guide post C3 is mounted on the base plate C1, the second guide block C5 is mounted on the second guide post C3, and the second spring C4 is fitted over the second guide post C3. Both ends abut against the base plate C1 and the second guide block C5 respectively. The second guide block C5 is provided with a base cavity C6, a first spring placement cavity C7, a second spring placement cavity C8 and a second thermistor placement cavity C9. One end of the first thermistor limiting post C10, the second spring limiting post C11 and the first spring limiting post C12 are fixed on the base plate C1. The other ends of the first thermistor limiting post C10, the second spring limiting post C11 and the first spring limiting post C12 are located in the second thermistor placement cavity C9, the second spring placement cavity C8 and the first spring placement cavity C7 respectively.

[0086] The assembly method for PTC chip component assembly equipment is as follows: S1. Place the first reed 9, the second reed 10, the first thermistor 8 and the first pin 6 into the first reed placement cavity C7, the second reed placement cavity C8, the second thermistor placement cavity C9 and the first pin placement cavity B7 respectively. The cylinder B1 pushes the slide plate B2 to the position where the first guide block B5 and the second guide block C5 are joined. After receiving the delivery signal from the third sensor SQ3, the control system performs the next action control. S2. Place the base 16 in the base cavity 1 B6 and the base cavity 2 C6. The control system controls the cylinder 1 A1 to push the rubber pad A2 onto the base 16, causing the guide block 1 B5 and the guide block 2 C5 to descend. After receiving the delivery signal from the sensor 1 SQ1, the control system will proceed with the next action control. S3. After the control system receives the delivery arrival signals from sensor SQ2 and sensor SQ4 in sequence, the assembly cycle of one PTC chip component ends.

[0087] The differences between assembling the PTC chip assembly in Example 2 and Example 1 are as follows: The first placement mechanism B in the PTC chip component assembly equipment includes cylinder B1, slide plate B2, guide post B3, spring B4, guide block B5, base cavity B6, first pin placement cavity B7, first pin limiting post B8, electrical connector limiting post (not shown in the figure), first thermistor placement cavity B9, and electrical connector placement cavity (not shown in the figure). The piston rod of cylinder B1 is connected to slide plate B2. Sensor SQ3 and sensor SQ4 are installed on the cylinder barrel of cylinder B1. Installed on the slide plate B2, guide block B5 is installed on guide post B3, spring B4 is fitted outside guide post B3, and both ends of spring B4 abut against slide plate B2 and guide block B5 respectively. Guide block B5 is provided with base cavity B6, first pin placement cavity B7, first thermistor placement cavity B9 and electrical connector placement cavity. One end of first pin limiting post B8 and electrical connector limiting post is fixed on slide plate B2, and the other end of first pin limiting post B8 and electrical connector limiting post is located in first pin placement cavity B7.

[0088] In the assembly method of the PTC chip component assembly equipment, S1, the first spring 9, the second spring 10, the first thermistor 8, the first pin 6, and the electrical connector 17 are placed in the first spring placement cavity C7, the second spring placement cavity C8, the second thermistor placement cavity C9, the first pin placement cavity B7, and the electrical connector placement cavity, respectively. The cylinder B1 pushes the slide plate B2 to the position where the guide block B5 and the guide block C5 are joined. After receiving the delivery signal from the third sensor SQ3, the control system performs the next action control.

[0089] Specifically, the installation connection relationship of the pin-type starter thermal protector is as follows (using Example 1 as an example): Before installation, the first pin 6 and the second pin 5 are pre-welded, and the connecting piece 4 and the first pin 3 are pre-welded; firstly, the first pin 6, the second pin 5, the first spring 9, the second spring 10, the first thermistor 8 and the base 16 are assembled using a PTC chip assembly equipment, completing the one-time assembly of the first pin 6, the second pin 5, the first spring 9, the second spring 10 and the first thermistor 8. The components are respectively installed into the first pin mounting cavity 16-23, the second pin mounting cavity 16-20, the first spring mounting cavity 16-16, the second spring mounting cavity 16-14, and the first thermistor mounting cavity 16-24 corresponding to the base 16; then the connecting tab 4, the first pin 3, the second pin 11, the bidirectional thyristor 12, the third spring 13, the second thermistor 14, and the fourth spring 15 are respectively installed into the connecting tab mounting cavity 16-22, the first pin mounting cavity 16-21, and the second spring mounting cavity 16-24 corresponding to the base 16. The bidirectional thyristor 12 is disposed between the second pin 11 and the second thermistor 14 within the pin mounting cavity 16-13, the bidirectional thyristor mounting cavity 16-15, the third spring mounting cavity 16-17, the second thermistor mounting cavity 16-18, and the fourth spring mounting cavity 16-19. The first electrode 12-1 of the bidirectional thyristor 12 is connected to the second pin bracket 11-2 of the second pin 11. The second electrode 12-2 of the bidirectional thyristor 12 is connected to the second spring bracket 10-1 of the second spring 10 and the fourth spring of the fourth spring 15. The holder 15-1 is connected, and the trigger electrode 12-3 of the bidirectional thyristor 12 is connected to the third spring holder 13-1 of the third spring 13; the first thermistor 8 is held by the spring force of the first spring contact 9-1 of the first spring 9 and contacts the second spring contact 10-2 of the second spring 10 and the first pin contact 6-2 of the first pin 6 in a three-point support manner; the third spring contact 13-2 of the third spring 13 and the fourth spring contact 15-2 of the fourth spring 15 apply force to the corresponding two poles of the second thermistor 14 respectively.

[0090] When the first thermistor 8 breaks, it usually breaks in the middle or outward from the middle of the first thermistor 8. At this time, due to the force applied by the first spring contact 9-1 to the edge of the first thermistor 8, the first thermistor 8 separates from each other at its break point, ensuring that there is no power between the first pin contact 6-2, the second spring contact 10-2 and the first thermistor 8, thereby cutting off the power circuit and protecting the compressor auxiliary winding. After all the components are installed, the cover plate 2 and the base 16 are snapped together, and then the connecting end 7-3 of the double plug 7 is connected to the output end 6-3 of the first pin 6. Finally, the thermal protector 1 is installed into the thermal protector mounting cavity 16-1 and the mounting elastic claw 16-2 is engaged and snapped together. At this point, the installation of the pin-type starter thermal protector is completed.

[0091] The compressor motor circuit is connected via the first pin 6 of the compressor's M terminal and the second pin 11 of the compressor's S terminal. At this time, one end of the first thermistor 8 is connected to the main winding lead of the motor, and the other end of the first thermistor 8 is simultaneously connected to one end of the second thermistor 14 and the second electrode 12-2 of the bidirectional thyristor 12. The other end of the second thermistor 14 is connected to the trigger electrode 12-3 of the bidirectional thyristor 12, and the first electrode 12-1 of the bidirectional thyristor 12 is connected to the auxiliary winding lead of the motor. The bidirectional thyristor 12 is in the off state, and the first thermistor 8 is in a low-resistance conducting state at room temperature, with a resistance typically between 3.9 and 100 Ω. The second thermistor 14 is also in a normal temperature conducting state, and its resistance is generally around 600 to 1800 Ω. At the beginning of compressor motor startup, since the bidirectional thyristor 12 is in the off state, the current through the second thermistor 14 is sufficient to trigger the bidirectional thyristor 12 to conduct, and the starting circuit enters the working state. The first thermistor 8 in the starting circuit is supplied with a large motor auxiliary winding starting current. The first thermistor 8 heats up quickly, causing its resistance value to rise rapidly. When its temperature reaches the Curie temperature of the first thermistor 8, its resistance value reaches a high resistance state, thereby cutting off the compressor motor auxiliary winding and allowing the compressor motor to enter the normal working state.

[0092] After the compressor enters the working state, as the current through the first thermistor 8 and the second thermistor 14 gradually decreases, the bidirectional thyristor 12 is in the off state. At this time, since the power consumption of the second thermistor 14 is less than 0.5W, the power consumption of the sampling system can be as low as milliwatts during normal operation, which is the so-called "low power" starter.

[0093] To improve the working efficiency of the compressor motor, a running capacitor is connected in parallel between the first pin 6 and the second pin 11 via the double connector 7. After being inserted into the compressor's three-core terminal, the power supply neutral wire forms a main winding conduction circuit through the first pin 6. When the thermal protector 1 is inserted into the compressor's C terminal, its connection terminal is connected to the power supply live wire, thus connecting the thermal protector 1 in series in the compressor motor circuit. When the mains voltage is too high or too low, or when a fault occurs in the refrigeration system, the thermal protector will activate, thereby cutting off the power supply and protecting the compressor motor.

[0094] A pin insertion device is constituted by a first pin mounting cavity 16-21, a second pin mounting cavity 16-20, a connecting insert mounting cavity 16-22, a foolproof socket 16-11, and a pull-out retainer 16-12. The first pin mounting cavity 16-21 and the second pin mounting cavity 16-20 are located within the foolproof socket 16-11. The first pin 6 is installed after being mounted in the first pin mounting cavity 16-23. The second pin 5 extends outward through the second pin mounting cavity 16-20, and the first pin 3 extends outward through the first pin mounting cavity 16-21. Figure 3 As shown, the first pin 3 and the second pin 5 are set on the only foolproof socket 16-11 on the base 16. The foolproof socket 16-11 is asymmetrical with respect to its vertical center line. The first pin 3 is electrically connected to the connecting piece 4, and the second pin 5 is electrically connected to the first pin 6. The external power connector is fixed to the foolproof socket 16-11. The N end and L end of the external power connector are electrically connected to the first pin 3 and the second pin 5, respectively.

[0095] Once the external power connector is inserted into the foolproof socket 16-11, it ensures that the N and L ends of the external power connector are connected to the second pin 5 and the first pin 3 respectively in one go, and has a foolproof function to prevent incorrect wiring. The external power connector cannot be inserted into the foolproof socket 16-11 in reverse. The side of the foolproof socket 16-11 is provided with an anti-pull-out claw 16-12, which engages with the claw of the external power connector, so that the pin-type starter thermal protector has an anti-pull-out claw function.

[0096] See Figure 4 A thermal protector mounting cavity 16-1 is provided on the base 16, and an elastic mounting claw 16-2 is provided inside the thermal protector mounting cavity 16-1. During installation, the thermal protector 1 can be directly inserted into the thermal protector mounting cavity 16-1 and locked in place by the elastic mounting claw 16-2. A first guide block 16-3 and a second guide block 16-4 are respectively provided on both sides of the thermal protector mounting cavity 16-1, which can play a guiding role when installing the thermal protector 1. A first guide surface 16-5 and a second guide surface 16-6 are provided on the first guide block 16-3, and a third guide surface 16-7 and a fourth guide surface 16-8 are provided on the second guide block 16-4, which can make the fit with the thermal protector 1 more secure.

[0097] The clamping method of the first thermistor 8 with the first pin 6, the electrical connector 17, the first spring 9, and the second spring 10 in Embodiment 2 adopts the patent technology disclosed in ZL202110901499.3.

[0098] In Example 2, the first pin 6, the second pin 5, the electrical connector 17, the first thermistor 8, the first spring 9, and the second spring 10 are assembled in one go using a PTC chip assembly equipment and respectively installed into the first pin mounting cavity 16-23, the second pin mounting cavity 16-20, the electrical connector mounting cavity 16-25, the first thermistor mounting cavity 16-24, the first spring mounting cavity 16-16, and the second spring mounting cavity 16-14 of the base 16. Then, the other components are installed and assembled one by one. Finally, the thermal protector 1 is installed into the thermal protector mounting cavity 16-1 and engaged with the mounting elastic claw 16-2. At this point, the pin-type starter thermal protector installation is completed.

[0099] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model are included within the protection scope of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A pin-type starting thermal protector, comprising a thermal protector (1), a cover plate (2), a first pin (3), a connecting tab (4), a double tab (7), a second pin (11), a bidirectional thyristor (12), a third spring (13), a second thermistor (14), a fourth spring (15), a base (16), and a PTC chip assembly, wherein the PTC chip assembly comprises a second pin (5), a first pin (6), a first thermistor (8), a first spring (9), and a second spring (10), and the thermal protector (1) is mounted on the base (16), characterized in that: The first pin (3) is connected to the connecting tab (4), the second pin (5) is connected to the first pin (6), the first pin (6) is connected to the double-joint tab (7), the second spring (10), the second pin (11), the third spring (13) and the fourth spring (15) are all connected to the bidirectional thyristor (12), the third spring (13) and the fourth spring (15) are respectively connected to the two poles of the second thermistor (14), and the first pin (6), the first spring (9), and the second spring (10) are respectively connected to the two poles of the first thermistor (8).

2. The pin-in-needle start-up thermal protector of claim 1, wherein: The first thermistor (8), the second reed (10), the bidirectional thyristor (12), the fourth reed (15), and the second thermistor (14) are connected in series.

3. The pin-in-needle start-up thermal protector of claim 1, wherein: The PTC chip assembly also includes an electrical connector (17), the first pin (6) is connected to the electrical connector (17), and the electrical connector (17) is connected to the first thermistor (8).

4. The pin-in-needle start-up thermal protector of claim 1, wherein: The first pin (3), connecting tab (4), second pin (5), first pin (6), double tab (7), first thermistor (8), first spring (9), second spring (10), second pin (11), bidirectional thyristor (12), third spring (13), second thermistor (14) and fourth spring (15) are all installed in the cavity formed by the cover plate (2) and the base (16).

5. The pin-in-needle start-up thermal protector of claim 3, wherein: The electrical connector (17) is installed in the cavity formed by the cover plate (2) and the base (16).

6. The pin-in-needle start-up thermal protector of claim 1, wherein: The base (16) has a PTC chip assembly mounting cavity in the middle, and the PTC chip assembly is installed in the PTC chip assembly mounting cavity.

7. A PTC chip assembly mounting apparatus for mounting the PTC chip assembly of claim 1, characterized by: The PTC chip assembly equipment includes a pressing mechanism (A), a first placement mechanism (B), and a second placement mechanism (C). The pressing mechanism (A) is located above the first placement mechanism (B) and the second placement mechanism (C). When the first placement mechanism (B) and the second placement mechanism (C) are closed, the pressing mechanism (A) cooperates with the first placement mechanism (B) and the second placement mechanism (C).

8. The PTC chip assembly apparatus according to claim 7, wherein: The pressing mechanism (A) includes a cylinder (A1) and a rubber pad (A2). The piston rod of the cylinder (A1) is connected to the rubber pad (A2). A sensor (SQ1) and a sensor (SQ2) are installed on the cylinder barrel of the cylinder (A1).

9. The PTC chip assembly apparatus according to claim 7, wherein: The first placement mechanism (B) includes a second cylinder (B1), a sliding plate (B2), a first guide post (B3), a first spring (B4), a first guide block (B5), a first base cavity (B6), a first pin placement cavity (B7), a first pin limiting post (B8), and a first thermistor placement cavity (B9). The piston rod of the second cylinder (B1) is connected to the sliding plate (B2). Sensors No. 3 (SQ3) and No. 4 (SQ4) are installed on the cylinder barrel of the second cylinder (B1). The first guide post (B3) is installed on the sliding plate (B2). The first guide block (B5) is mounted on the first guide post (B3), and the first spring (B4) is fitted outside the first guide post (B3). The two ends of the first spring (B4) abut against the slide plate (B2) and the first guide block (B5) respectively. The first guide block (B5) is provided with a base cavity (B6), a first pin placement cavity (B7) and a first thermistor placement cavity (B9). One end of the first pin limiting post (B8) is fixed on the slide plate (B2), and the other end of the first pin limiting post (B8) is located in the first pin placement cavity (B7).

10. The PTC chip assembly apparatus of claim 7, wherein: The second placement mechanism (C) includes a base plate (C1), a rail (C2), a second guide post (C3), a second spring (C4), a second guide block (C5), a second base cavity (C6), a first spring placement cavity (C7), a second spring placement cavity (C8), a second first thermistor placement cavity (C9), a first thermistor limiting post (C10), a second spring limiting post (C11), and a first spring limiting post (C12). The first placement mechanism (B) is mounted on the base plate (C1) via the rail (C2). The second guide post (C3) is mounted on the base plate (C1), the second guide block (C5) is mounted on the second guide post (C3), and the second spring (C4) is fitted over the second guide post (C3). (C4) has two ends that abut against the base plate (C1) and the second guide block (C5) respectively. The second guide block (C5) is provided with a base cavity (C6), a first spring plate placement cavity (C7), a second spring plate placement cavity (C8), and a second thermistor placement cavity (C9). One end of the first thermistor limiting post (C10), the second spring plate limiting post (C11), and the first spring plate limiting post (C12) are all fixed on the base plate (C1). The other ends of the first thermistor limiting post (C10), the second spring plate limiting post (C11), and the first spring plate limiting post (C12) are located in the second thermistor placement cavity (C9), the second spring plate placement cavity (C8), and the first spring plate placement cavity (C7) respectively.

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