Compressor ptc starter

Abstract

A compressor PTC starter belongs to the technical field of motor starting devices. It includes a housing and a housing cover; a thyristor (SCR) with its lower part disposed in the housing cavity and its upper part inserted into the housing cover cavity; a first PTC starting mechanism, a second PTC starting mechanism, and an S-connector disposed within the housing cavity. The first PTC starting mechanism includes a flat cylindrical first PTC, and the second PTC starting mechanism includes a cylindrical second PTC. The first and second PTC starting mechanisms are electrically connected to each other through the first PTC. The key feature is that the first PTC is horizontally positioned at the bottom of the housing cavity with its downward-facing side as a positioning support and its upward-facing side as an elastic clamp, and is subjected to contact pressure from the housing cover on the upward-facing side. The second PTC is longitudinally inserted into the housing cavity. Advantages: excellent stability; reduced steady-state power consumption for energy saving; improved operational reliability and service life; quick and convenient installation; no installation-related malfunctions.

Description

Technical Field

[0001] This invention belongs to the technical field of motor starting devices, specifically relating to a compressor PTC starter. Background Technology

[0002] A single PTC (Positive Temperature Coefficient) thermistor starter, after providing starting torque to the single-phase induction motor of the compressor, maintains a high resistance state due to its own characteristics. Its energy-saving issues mainly stem from the following factors: In terms of working principle, after starting, the PTC maintains high resistance due to its positive temperature coefficient characteristics, but the starting winding circuit is not disconnected. In terms of energy loss, even in the high resistance state, a small current (e.g., tens to hundreds of milliamps) continues to flow through the PTC and starting winding. This current does not generate useful work and is almost entirely converted into heat, becoming "parasitic power consumption" that continuously consumes electrical energy. Quantitatively, this power consumption is typically between 3 and 15 watts, and for a refrigerator compressor running year-round, the accumulated energy consumption is considerable.

[0003] With increasing awareness of energy conservation and emission reduction, low-power or zero-power PTC starters have become mainstream components, and can be found in published Chinese patent documents, such as "A Compressor PTC Starter" published in CN104038107A and "A Contactless Starter for a Refrigeration Compressor with Large Current" recommended in CN113890419A, etc. These patents share the common feature of having a button-shaped first PTC belonging to a first PTC starting mechanism, a small cylindrical second PTC belonging to a second PTC starting mechanism, and a controller acting as a thyristor. However, both patents suffer from a common drawback: the first PTC is clamped and inserted vertically into the housing 1 by elastic pressure feet of elastic connecting plates facing each other on both sides, and the second PTC is placed horizontally within the housing. One of the aforementioned drawbacks is that, because the two sides of the first PTC (the two sides with electrode layers) are in a state of elastic clamping that works together, and the clamping parts tend to be tangent to the two side surfaces of the first PTC, uneven stress or fatigue of the elastic elements on both sides can lead to inconsistent contact pressure, affecting the stability of the positioning of the first PTC. Some might argue that changing the PTC's orientation from vertical to horizontal would cause a failure to conduct, because in a vertical orientation, after breakage, the fragments would shift and fall, physically breaking the circuit. In a horizontal orientation, after breakage, the fragments might spread and accumulate between the two electrodes, i.e., between the aforementioned elastic connecting pieces on both sides, causing the circuit to unexpectedly regain conduction. However, the most common failure mode of a PTC is resistance drift, becoming permanently high or low resistance, rather than physical breakage. Therefore, failure to conduct is not a high-efficiency risk. Moreover, with a controller using a silicon controlled rectifier (SCR) as the core switch, the danger of a PTC failure to conduct is greatly reduced. Because the thyristor can transform the core of the protection system from passively relying on the thermal characteristics of the PTC to actively controlling it electronically, the importance of both roles has fundamentally changed. Based on the aforementioned scenario factors, setting the PTC to a horizontal position will not cause any substantial impact. The second drawback is that, during compressor operation, the vertically positioned first PTC has low sensitivity to thermal conduction temperature, which is not conducive to reducing the PTC's energy consumption to the desired level. This is because the heat conduction path is sequentially from the compressor housing, PTC housing cavity, air gap, PTC connector, and PTC. In addition to the long path, there are many interfaces, high thermal resistance, and weak thermal coupling between the PTC and the compressor housing. The third drawback is that, since the second PTC is horizontally clamped laterally, it needs to be pushed into the elastic clamp from the side. This may cause jamming, poor contact, or PTC dimensional tolerances due to misalignment, elastic deformation, or other reasons, and the installation is very inconvenient. Summary of the Invention

[0004] The objective of this invention is to provide a compressor PTC starter that helps the first PTC to exhibit excellent stability by combining positioning and clamping, improves the thermal conductivity sensitivity of the first PTC to reduce energy consumption, facilitates convenient and quick installation of the second PTC, and ensures the reliability of electrical connections to avoid installation-related failures.

[0005] The objective of this invention is achieved by providing a compressor PTC starter, comprising a housing and a cover that mates with the housing and forms a cover cavity; a thyristor disposed at a lower part in the cover cavity of the housing and extended at an upper part into the cover cavity; a first PTC starting mechanism, a second PTC starting mechanism, and an S-connector, each disposed in the housing cavity and electrically connected to the thyristor; the first PTC starting mechanism comprising a flat cylindrical first PTC, and the second PTC starting mechanism comprising a cylindrical second PTC electrically connected to the first PTC starting mechanism; the first and second PTC starting mechanisms being electrically connected to each other via the first PTC; characterized in that: the first PTC is horizontally disposed at the bottom of the housing cavity with its downward-facing side in a positioning support and its upward-facing side in an elastic clamping state, and the cover applying contact pressure to the upward-facing side; the second PTC is inserted longitudinally into the housing cavity.

[0006] In a specific embodiment of the present invention, a thyristor insertion cavity, a first PTC starting mechanism receiving cavity, a second PTC starting mechanism receiving cavity, and an S-connector pin cavity are provided within the housing cavity of the housing. The lower part of the thyristor is inserted into the thyristor insertion cavity. The first PTC starting mechanism is received in the first PTC starting mechanism receiving cavity, and the second PTC starting mechanism is received in the second PTC starting mechanism receiving cavity. An S-connector pin is formed at the lower end of the S-connector, which is inserted into the S-connector pin cavity. The upper end of the S-connector passes through the housing cover and extends above the housing cover. The housing cover is fastened to the housing.

[0007] In another specific embodiment of the present invention, the first PTC starting mechanism receiving cavity includes a first PTC cavity, a first PTC positioning support electrical connection piece cavity, an M-pin cavity, and a second PTC electrical connection pin socket cavity. The first PTC starting mechanism further includes a first PTC positioning support electrical connection piece and a first PTC elastic clamping electrical connection piece. The first PTC positioning support electrical connection piece is fitted into the first PTC positioning support electrical connection piece cavity. A first PTC positioning support electrical connection piece first electrical connection pin and a second PTC positioning support electrical connection piece second electrical connection pin extend upward at intervals on the upper part of the first PTC positioning support electrical connection piece. The first and second electrical connection pins of the first PTC positioning support electrical connection piece pass through the housing cover and extend above the housing cover. An M-pin extends downward at the lower part of the first PTC positioning support electrical connection piece and at a position corresponding to the second electrical connection pin of the first PTC positioning support electrical connection piece. The M-pin is fitted into the M-pin cavity. A second PTC electrical connection pin socket is formed at the lower front end of the first PTC positioning support electrical connection piece. A socket is inserted into the cavity of the second PTC electrical connector socket. A second PTC electrical connector extends from the left side of the second PTC electrical connector socket, reaching into the cavity of the second PTC starting mechanism and corresponding to the bottom of the second PTC. A first PTC positioning support arm is formed on the left side of the first PTC positioning support electrical connector piece. A first PTC positioning support plate for electrical connection with the first PTC is formed at the front end of the first PTC positioning support arm. The downward-facing side of the first PTC is positioned and supported on the first PTC positioning support plate, and the first PTC is disposed at the bottom of the first PTC cavity along with the first PTC positioning support plate. The upper end of the first PTC elastic clamping electrical connector piece corresponds to the upper side of the first PTC and forms a pair or one first PTC elastic clamping claw. The downward-facing side of the first PTC elastic clamping claw is electrically connected to the upward-facing side of the first PTC. The lower end of the first PTC elastic clamping electrical connector piece forms a thyristor cathode electrical connector, which is electrically connected to the thyristor.

[0008] In another specific embodiment of the present invention, the second PTC starting mechanism receiving cavity includes a second PTC electrical connector insertion cavity and a second PTC insertion cavity; the second PTC electrical connector extends into the second PTC insertion cavity; the second PTC starting mechanism further includes a second PTC electrical connector, which is inserted into the second PTC electrical connector insertion cavity, and a second PTC elastic clamping claw extends from the right end of the second PTC electrical connector, the lower end of the second PTC elastic clamping claw being aligned with the upper surface of the second PTC. The second PTC electrical connector has a second PTC electrical connector SCR electrical connector pin folded backward at the left end of the second PTC electrical connector. The second PTC electrical connector SCR electrical connector pin is electrically connected to the SCR. The cover applies contact pressure to the upward-facing side of the first PTC elastic clamping claw, the upper end of the first PTC elastic clamping electrical connector, and the upward-facing side of the end of the second PTC elastic clamping claw. The second PTC is longitudinally inserted into the second PTC insertion cavity in a state where it is clamped by the second PTC elastic clamping claw and the second PTC electrical connector pin.

[0009] In another specific embodiment of the present invention, a set of first PTC contact point flanges protruding from the upper surface of the first PTC positioning support plate are formed at intervals on the upward side of the first PTC positioning support plate, and the downward side surface of the first PTC is supported on the set of first PTC contact point flanges; a PTC contact boss is formed on the upward side of the end of the second PTC electrical connection pin, and the center part of the bottom surface of the second PTC is supported on the PTC contact boss.

[0010] In another specific embodiment of the present invention, the thyristor has a control electrode, an anode and a cathode, the second PTC electrical connector is electrically connected to the control electrode, the S connector is electrically connected to the anode, and the thyristor cathode connector is electrically connected to the cathode.

[0011] In a further specific embodiment of the present invention, an S-connector thyristor anode connection pin extends from the front middle side of the S-connector and at a position corresponding to the anode, the S-connector thyristor anode connection pin being electrically connected to the anode.

[0012] In a further specific embodiment of the present invention, on the cover, at positions corresponding to the S-connector, the first electrical connection foot of the first PTC positioning support electrical connection piece, and the second electrical connection foot of the first PTC positioning support electrical connection piece, respectively, there are S-connector upper end protrusion clearance holes, electrical connection foot first clearance holes, and electrical connection foot second clearance holes for communicating the cover cavity of the cover with the outside. The upper end of the S-connector extends to the top of the cover through the S-connector upper end protrusion clearance holes, and the first and second electrical connection feet of the first PTC positioning support electrical connection piece extend to the top of the cover through the first and second electrical connection foot clearance holes, respectively.

[0013] In yet another specific embodiment of the present invention, the upper surface of the first PTC elastic clamping electrical connector is configured as an electrical connector pressing surface; within the housing cavity of the housing cover, and at positions corresponding to the upper ends of the first PTC elastic clamping claw, the electrical connector pressing surface, the second PTC elastic clamping claw, and the upper edge of the second PTC electrical connector, are configured a PTC elastic clamping claw pressing post, an electrical connector pressing surface pressing post, a second PTC elastic clamping claw end pressing post, and an upper edge pressing boss of the second PTC electrical connector. The PTC elastic clamping claw pressing post is in contact with the upward-facing side of the first PTC elastic clamping claw, the electrical connector contact surface pressing post is in contact with the electrical connector contact surface, the end pressing post of the second PTC elastic clamping claw is in contact with the upward-facing side of the end of the second PTC elastic clamping claw, and the upper edge pressing boss of the second PTC electrical connector is in contact with the upper edge of the second PTC electrical connector; a thyristor upper insertion cavity is formed in the housing cavity and at the position corresponding to the thyristor, and the upper part of the thyristor is inserted into the thyristor upper insertion cavity.

[0014] In yet another specific embodiment of the present invention, a cover latch is formed on the outer wall of the left and right sides of the cover, and a latch mating seat is formed on the outer wall of the left and right sides of the housing at a position corresponding to the cover latch, and the cover latch mates with the latch mating seat.

[0015] The technical advantages of the solution provided by this invention are as follows: Because the first PTC of the starting mechanism is positioned and supported with its downward-facing side fixedly, and its upward-facing side is elastically clamped and placed horizontally at the bottom of the housing cavity under the condition that the housing cover applies contact pressure to the upward-facing side, the first PTC can achieve both positioning and clamping, thus exhibiting excellent stability. Because the first PTC is placed horizontally at the bottom of the housing cavity, its temperature can more closely follow the ambient temperature, reducing reliance on self-heating. This not only reduces steady-state power consumption for greater energy saving but also improves the reliability of the starter in avoiding malfunctions and helps reduce thermal stress, thus extending its service life. Because the second PTC is changed from a horizontal horizontal installation to a vertical insertion into the housing cavity, installation is quicker and more convenient, and no installation-related malfunctions occur. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram showing the assembly and the view after removing the cover; Figure 3 for Figure 1 A schematic diagram showing the bottom of the shell cover; Figure 4 for Figure 1 External view diagram after assembly; Figure 5 for Figure 4 A diagram showing the view from the bottom.

[0017] In the diagram: 1. Housing; 11. Housing cavity; 111. Thyristor insertion cavity; 112. First PTC starting mechanism receiving cavity; 1121. First PTC cavity; 1122. First PTC positioning support electrical connector cavity; 1123. M pin cavity; 1124. Second PTC electrical connector socket cavity; 113. Second PTC starting mechanism receiving cavity; 1131. Second PTC electrical connector insertion cavity; 1132. Second PTC insertion cavity; 114. S connector pin cavity; 12. Pin mating seat; 2. Housing cover; 21. Housing cover cavity; 211. PTC elastic clamping claw pressing post; 212. Electrical connector contact surface pressing post; 213. Second PTC elastic clamping claw end pressing post; 214. Second PTC electrical connector upper edge pressing boss; 215. Thyristor upper insertion cavity; 22. 23. First clearance hole for electrical connector pin; 24. Second clearance hole for electrical connector pin; 25. Cover pin; 3. SCR; 31. Control electrode; 32. Anode; 33. Cathode; 4. First PTC starting mechanism; 41. First PTC; 42. First PTC positioning support electrical connector; 421. First electrical connector pin for first PTC positioning support electrical connector; 422. Second electrical connector pin for first PTC positioning support electrical connector; 423. M pin; 424. Second PTC electrical connector base; 4241. Second PTC electrical connector pin; 42411. PTC contact boss; 425. First PTC positioning support arm; 4251. First PTC positioning support plate; 42511. First PTC contact flange; 43. First PTC elastic clamping electrical connector; 431. First PTC elastic clamping claw; 432. 433. Electrical connection plate pressing surface of thyristor cathode; 5. Second PTC starting mechanism; 51. Second PTC; 52. Second PTC electrical connection plate; 521. Second PTC elastic clamping claw; 522. Second PTC electrical connection plate thyristor electrical connection pin; 6. S connector; 61. S connector pin; 62. S connector thyristor anode connection pin. Detailed Implementation

[0018] In order to better understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the present invention. Any formal but not substantive equivalent transformations made based on the concept of the present invention should be considered within the scope of the present invention.

[0019] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the current... Figure 1The location and state of the object are examples, and therefore should not be construed as a special limitation on the technical solution provided by the present invention.

[0020] Please see Figure 1 The diagram shows a housing 1, both made of plastic and molded by a mold, and a cover 2 that fits with the housing 1 and forms a cover cavity 21; it also shows a silicon controlled rectifier (SCR) 3, the lower part of which is disposed in the housing cavity 11 of the housing 1 and the upper part of which extends into the cover cavity 21; it further shows a first PTC starting mechanism 4, a second PTC starting mechanism 5, and an S-connector 6, each disposed in the aforementioned housing cavity 11 and electrically connected to the aforementioned SCR 3. The aforementioned first PTC starting mechanism 4 includes a flat cylindrical first PTC 41, and the aforementioned second PTC starting mechanism 5 includes a cylindrical second PTC 51 electrically connected to the aforementioned first PTC starting mechanism 4. The first and second PTC starting mechanisms 4 and 5 are electrically connected to each other through the aforementioned first PTC 41.

[0021] The key technical points of the technical solution provided by the present invention are as follows: the first PTC41 is positioned and supported with its downward side and elastically clamped with its upward side, and is horizontally disposed at the bottom of the aforementioned housing cavity 11 under the condition that the aforementioned housing cover 2 applies contact pressure to the upward side, and the aforementioned second PTC51 is inserted into the aforementioned housing cavity 11 in a longitudinal state.

[0022] The housing cavity 11 of the aforementioned housing 1 is provided with a thyristor insertion cavity 111, a first PTC starting mechanism receiving cavity 112, a second PTC starting mechanism receiving cavity 113, and an S-connector pin cavity 114 (also referred to as "S-connector insertion cavity"). The lower part of the aforementioned thyristor 3 is inserted into the thyristor insertion cavity 111. The aforementioned first PTC starting mechanism 4 is housed in the aforementioned first PTC starting mechanism receiving cavity 112. The aforementioned second PTC starting mechanism 5 is housed in the second PTC starting mechanism receiving cavity 113. An S-connector pin 61 is formed at the lower end of the aforementioned S-connector 6. The S-connector pin 61 is inserted into the S-connector pin cavity 114. The upper end of the S-connector 6 passes through the aforementioned housing cover 2 and extends above the housing cover 2. The aforementioned housing cover 2 is fastened to the aforementioned housing 1.

[0023] See you later Figure 1 And see also Figure 2The aforementioned first PTC starting mechanism receiving cavity 112 includes a first PTC cavity 1121, a first PTC positioning support electrical connector cavity 1122, an M-pin cavity 1123, and a second PTC electrical connector socket cavity 1124. The aforementioned first PTC starting mechanism 4 also includes a first PTC positioning support electrical connector 42 and a first PTC elastic clamping electrical connector 43. The first PTC positioning support electrical connector 42 is fitted into the aforementioned first PTC positioning support electrical connector cavity 1122. A first PTC positioning support electrical connector first electrical connector 421 extends upward from the upper part of the first PTC positioning support electrical connector 42 at intervals from each other. A first PTC positioning support electrical connector and a second electrical connector pin 422 are provided. The first and second electrical connector pins 421 and 422 of the first PTC positioning support electrical connector pass through the aforementioned housing cover 2 and extend above the housing cover 2. At the lower part of the first PTC positioning support electrical connector 42 and at a position corresponding to the second electrical connector pin 422, an M-pin 423 extends downward. The M-pin 423 is inserted into the aforementioned M-pin cavity 1123. A second PTC electrical connector base 424 is formed at the lower front end of the first PTC positioning support electrical connector 42, and the second PTC electrical connector base 424 is inserted into the second PTC electrical connector pin. Within the socket cavity 1124, a second PTC electrical connection pin 4241 extends to the left side of the second PTC electrical connection pin seat 424. This second PTC electrical connection pin 4241 extends into the aforementioned second PTC starting mechanism receiving cavity 113 and corresponds to the bottom of the aforementioned second PTC 51. A first PTC positioning support arm 425 is formed on the left side of the first PTC positioning support electrical connection piece 42. A first PTC positioning support plate 4251 for electrical connection with the aforementioned first PTC 41 is formed at the front end of the first PTC positioning support arm 425. The downward-facing positioning support of the aforementioned first PTC 41 rests on this first PTC positioning support plate. On 4251, and together with the first PTC 41, the first PTC positioning support plate 4251 is disposed at the bottom of the aforementioned first PTC cavity 1121. The upper end of the first PTC elastic clamping electrical connection piece 43 corresponds to the upper side of the aforementioned first PTC 41 and forms a pair (but may also be one) of first PTC elastic clamping claws 431. The lower end of the first PTC elastic clamping claw 431 is electrically connected to the upper side of the first PTC 41. The lower side of the first PTC elastic clamping electrical connection piece 43 forms a thyristor cathode electrical connection pin 432, which is electrically connected to the aforementioned thyristor 3.

[0024] As can be seen from the foregoing description, since the downward-facing side of the first PTC41 is located at the bottom of the aforementioned first PTC cavity 1121 along with the first PTC positioning support plate 4251, while the upward-facing side is held by the first PTC elastic clamping claw 431, this confirms that the applicant's description in the above technical effect section achieves both fixing (positioning) and elastic clamping (single-sided elastic clamping), resulting in better stability.

[0025] See you later Figure 1 and Figure 2 The aforementioned second PTC starting mechanism receiving cavity 113 includes a second PTC electrical connector insertion cavity 1131 (also referred to as a "second PTC electrical connector insertion slot") and a second PTC insertion cavity 1132; the aforementioned second PTC electrical connector pin 4241 extends into the aforementioned second PTC insertion cavity 1132; the aforementioned second PTC starting mechanism 5 also includes a second PTC electrical connector 52, which is inserted into the aforementioned second PTC electrical connector insertion cavity 1131, and a second PTC elastic clamping claw 521 extends from the right end of the second PTC electrical connector 52, the lower end of the second PTC elastic clamping claw 521 being connected to the aforementioned second PTC... The upper surface of C51 is electrically connected. A second PTC electrical connector SCR electrical connector pin 522 is folded backward at the left end of the second PTC electrical connector 52. The second PTC electrical connector SCR electrical connector pin 522 is electrically connected to the aforementioned SCR 3. The aforementioned cover 2 applies contact pressure to the upward-facing side of the aforementioned first PTC elastic clamping claw 431, the upper end of the first PTC elastic clamping electrical connector 43, and the upward-facing side of the end of the second PTC elastic clamping claw 521. The aforementioned second PTC 51 is longitudinally inserted into the aforementioned second PTC insertion cavity 1132 in a state where it is co-clamped by the aforementioned second PTC elastic clamping claw 521 and the aforementioned second PTC electrical connector pin 4241.

[0026] Depend on Figure 1 As shown, a set of first PTC contact point flanges 42511 protruding from the upper surface of the first PTC positioning support plate 4251 are formed at intervals on the upward side of the first PTC positioning support plate 4251. Since the downward side surface of the first PTC 41 is supported on the set of first PTC contact point flanges 42511, the first PTC 41 has a fixing effect or fixing tendency. A PTC contact boss 42411 is formed on the upward side of the end of the second PTC electrical connection pin 4241. The center part of the bottom surface of the second PTC 51 is supported on the PTC contact boss 42411.

[0027] In this embodiment, the shape of the aforementioned first PTC positioning support plate 4251 tends to be circular, and the number of a set of first PTC contact point flanges 42511 formed on its upward-facing side is preferably, but not absolutely limited to, three. These first PTC contact point flanges 42511 are all spherical or hemispherical in shape, and the shape of the aforementioned PTC contact boss 42411 is similar. Of course, a set of three first PTC contact point flanges 42511 makes the contact of the first PTC 41 more reliable.

[0028] The aforementioned thyristor 3 has a control electrode 31, an anode 32 and a cathode 33. The aforementioned second PTC electrical connector thyristor electrical connection pin 522 is electrically connected to the control electrode 31, the aforementioned S connector 6 is electrically connected to the anode 32, and the aforementioned thyristor cathode electrical connection pin 432 is electrically connected to the cathode 33.

[0029] An S-connector thyristor anode connection pin 62 extends from the front middle side of the aforementioned S-connector 6 and at a position corresponding to the aforementioned anode 32. The S-connector thyristor anode connection pin 62 is electrically connected to the aforementioned anode.

[0030] See you later Figure 1 On the aforementioned cover 2, at positions corresponding to the aforementioned S-connector 6, the first electrical connection foot 421 of the first PTC positioning support electrical connection piece, and the second electrical connection foot 422 of the first PTC positioning support electrical connection piece, respectively, there are S-connector upper end protrusion clearance holes 22, electrical connection foot first clearance holes 23, and electrical connection foot second clearance holes 24 for communicating the aforementioned cover cavity 21 of the cover 2 with the outside. The upper end of the aforementioned S-connector 6 extends to the top of the cover 2 through the S-connector upper end protrusion clearance hole 22, and the aforementioned first PTC positioning support electrical connection piece first and second electrical connection feet 421 and 422 extend to the top of the cover 2 through the first and second electrical connection foot first and second clearance holes 23 and 24, respectively.

[0031] Please see Figure 3 And combined Figure 1 and Figure 2The upper surface of the aforementioned first PTC elastic clamping electrical connector 43, facing upwards, is configured as an electrical connector pressing surface 433. Within the cover cavity 21 of the aforementioned cover 2, and corresponding to the upper ends of the aforementioned first PTC elastic clamping claw 431, the electrical connector pressing surface 433, the aforementioned second PTC elastic clamping claw 521, and the upper edge of the second PTC electrical connector 52, are configured a PTC elastic clamping claw pressing post 211, an electrical connector contact surface pressing post 212, a second PTC elastic clamping claw end pressing post 213, and a second PTC electrical connector upper edge pressing boss 214. The PTC elastic clamping claw presses against… The pressure post 211 is in contact with the upward-facing side of the first PTC elastic clamping claw 431, the pressure post 212 of the electrical connector contact surface is in contact with the pressure surface 433 of the electrical connector, the pressure post 213 of the end of the second PTC elastic clamping claw is in contact with the upward-facing side of the end of the second PTC elastic clamping claw 521, and the pressure boss 214 of the upper edge of the second PTC electrical connector is in contact with the upper edge of the second PTC electrical connector 52; a thyristor upper insertion cavity 215 is formed in the housing cavity 21 at the position corresponding to the thyristor 3, and the upper part of the thyristor 3 is inserted into the thyristor upper insertion cavity 215.

[0032] Please see Figure 4 , Figure 5 And combined Figure 1 On the outer walls of the left and right sides of the aforementioned cover 2, a cover latch 25 is formed, and on the outer walls of the left and right sides of the aforementioned housing 1, a latch mating seat 12 is formed at the position corresponding to the cover latch 25. The cover latch 25 and the latch mating seat 12 are matched.

[0033] Based on common knowledge, the aforementioned first PTC41 and second PTC51 are both positive temperature coefficient thermistors. Since the working principle of the compressor PTC starter of this invention falls within the scope of conventional knowledge in this field, and can be found in the patent documents mentioned in the background section above, the applicant will not elaborate on its working principle further.

[0034] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

Claims

1. A compressor PTC starter, comprising a housing (1) and a cover (2) that cooperates with the housing (1) and forms a cover cavity (21); a thyristor (3) with its lower part disposed in the housing cavity (11) of the housing (1) and its upper part extending into the cover cavity (21); a first PTC starting mechanism (4), a second PTC starting mechanism (5), and an S-connector (6) also disposed in the housing cavity (11) and electrically connected to the thyristor (3), wherein the first PTC starting mechanism (4) comprises a flat cylindrical first PTC (41), and the second PTC starting mechanism (5) comprises a cylindrical second PTC (51) electrically connected to the first PTC starting mechanism (4), and the first and second PTC starting mechanisms (4, 5) are electrically connected to each other through the first PTC (41), characterized in that: The first PTC (41) is positioned at the bottom of the housing cavity (11) with its downward side in a positioning support and its upward side in an elastic clamping state, and is subjected to contact pressure by the cover (2) on the upward side. The second PTC (51) is inserted into the housing cavity (11) in a longitudinal state.

2. A compressor PTC starter according to claim 1, characterized in that: The housing cavity (11) of the housing (1) is provided with a thyristor insertion cavity (111), a first PTC starting mechanism receiving cavity (112), a second PTC starting mechanism receiving cavity (113), and an S-connector pin cavity (114). The lower part of the thyristor (3) is inserted into the thyristor insertion cavity (111). The first PTC starting mechanism (4) is received in the first PTC starting mechanism receiving cavity (112). The second PTC starting mechanism (5) is received in the second PTC starting mechanism receiving cavity (113). An S-connector pin (61) is formed at the lower end of the S-connector (6). The S-connector pin (61) is inserted into the S-connector pin cavity (114). The upper end of the S-connector (6) passes through the housing cover (2) and extends above the housing cover (2). The housing cover (2) is fastened to the housing (1).

3. A compressor PTC starter according to claim 2, characterized in that: The first PTC starting mechanism receiving cavity (112) includes a first PTC cavity (1121), a first PTC positioning support electrical connector cavity (1122), an M-pin cavity (1123), and a second PTC electrical connector socket cavity (1124). The first PTC starting mechanism (4) further includes a first PTC positioning support electrical connector (42) and a first PTC elastic clamping electrical connector (43). The first PTC positioning support electrical connector (42) is fitted into the first PTC positioning support electrical connector cavity (1122). A first PTC positioning support electrical connector first electrical connector (421) extends upward from the upper part of the first PTC positioning support electrical connector (42) at intervals from each other. The first PTC positioning support electrical connector (421, 422) and a first PTC positioning support electrical connector (421, 422) are connected to a second electrical connector (422). The first PTC positioning support electrical connector (421, 422) passes through the cover (2) and extends above the cover (2). An M-pin (423) extends downward from the lower part of the first PTC positioning support electrical connector (42) and at the position corresponding to the second electrical connector (422). The M-pin (423) is inserted into the M-pin cavity (1123). A second PTC electrical connector base (424) is formed at the lower front end of the first PTC positioning support electrical connector (42). The second PTC electrical connector base (424) is inserted into the second PTC electrical connector. Inside the connector socket cavity (1124), a second PTC electrical connector (4241) extends to the left side of the second PTC electrical connector (424). The second PTC electrical connector (4241) extends into the second PTC starting mechanism receiving cavity (113) and corresponds to the bottom of the second PTC (51). A first PTC positioning support arm (425) is formed on the left side of the first PTC positioning support electrical connector (42). A first PTC positioning support plate (4251) for electrical connection with the first PTC (41) is formed at the front end of the first PTC positioning support arm (425). The downward-facing side of the first PTC (41) is positioned and supported on the first PTC positioning support plate (4251). The first PTC (41) is located on the support plate (4251) and is disposed at the bottom of the first PTC cavity (1121) by the first PTC positioning support plate (4251) together with the first PTC (41). The upper end of the first PTC elastic clamping electrical connection piece (43) is above the side of the first PTC (41) facing upward and forms a pair or a first PTC elastic clamping claw (431). The side of the first PTC elastic clamping claw (431) facing downward is electrically connected to the side of the first PTC (41) facing upward. The lower end of the first PTC elastic clamping electrical connection piece (43) forms a thyristor cathode electrical connection pin (432), which is electrically connected to the thyristor (3).

4. A compressor PTC starter according to claim 3, characterized in that: The second PTC starting mechanism receiving cavity (113) includes a second PTC electrical connector insert cavity (1131) and a second PTC insertion cavity (1132); the second PTC electrical connector pin (4241) extends into the second PTC insertion cavity (1132); the second PTC starting mechanism (5) also includes a second PTC electrical connector (52), which is inserted into the second PTC electrical connector insert cavity (1131), and a second PTC elastic clamping claw (521) extends from the right end of the second PTC electrical connector (52), the lower end of the second PTC elastic clamping claw (521) being electrically connected to the upper surface of the second PTC (51). The second PTC electrical connector (52) is folded backward at the left end and has a second PTC electrical connector thyristor electrical connector pin (522), which is electrically connected to the thyristor (3). The cover (2) applies contact pressure to the side of the first PTC elastic clamping claw (431) facing upward, the upper end of the first PTC elastic clamping electrical connector (43), and the side of the end of the second PTC elastic clamping claw (521) facing upward. The second PTC (51) is longitudinally inserted into the second PTC insertion cavity (1132) in the state of being clamped by the second PTC elastic clamping claw (521) and the second PTC electrical connector pin (4241).

5. A compressor PTC starter according to claim 3, characterized in that: On the upward-facing side of the first PTC positioning support plate (4251), a set of first PTC contact point flanges (42511) are formed at intervals, protruding from the upper surface of the first PTC positioning support plate (4251). The downward-facing side surface of the first PTC (41) is supported on the set of first PTC contact point flanges (42511). On the upward-facing side of the end of the second PTC electrical connection pin (4241), a PTC contact boss (42411) is formed. The center of the bottom surface of the second PTC (51) is supported on the PTC contact boss (42411).

6. A compressor PTC starter according to claim 4, characterized in that: The thyristor (3) has a control electrode (31), an anode (32) and a cathode (33). The second PTC electrical connector has a thyristor electrical connection pin (522) electrically connected to the control electrode (31), the S connector (6) is electrically connected to the anode (32), and the thyristor cathode electrical connection pin (432) is electrically connected to the cathode (33).

7. A compressor PTC starter according to claim 6, characterized in that: An S-connector thyristor anode connector pin (62) extends from the middle front side of the S-connector (6) at a position corresponding to the anode (32), and the S-connector thyristor anode connector pin (62) is electrically connected to the anode.

8. A compressor PTC starter according to claim 3, characterized in that: On the cover (2), at positions corresponding to the S-connector (6), the first electrical connection foot (421) of the first PTC positioning support electrical connection piece, and the second electrical connection foot (422) of the first PTC positioning support electrical connection piece, respectively, there are S-connector upper end protrusion clearance holes (22), electrical connection foot first clearance holes (23) and electrical connection foot second clearance holes (24) for communicating the cover cavity (21) of the cover (2) with the outside. The upper end of the S-connector (6) extends to the top of the cover (2) through the S-connector upper end protrusion clearance hole (22), and the first and second electrical connection feet (421, 422) of the first PTC positioning support electrical connection piece extend to the top of the cover (2) through the first and second electrical connection feet (23, 24), respectively.

9. A compressor PTC starter according to claim 4, characterized in that: The upper surface of the first PTC elastic clamping electrical connector (43) facing upward is formed as an electrical connector pressing surface (433); in the cover cavity (21) of the cover (2) and at positions corresponding to the upper ends of the first PTC elastic clamping claw (431), the electrical connector pressing surface (433), the second PTC elastic clamping claw (521), and the upper edge of the second PTC electrical connector (52), there are PTC elastic clamping claw pressing posts (211), electrical connector contact surface pressing posts (212), second PTC elastic clamping claw end pressing posts (213), and upper edge pressing bosses (214) of the second PTC electrical connector. The post (211) is in contact with the upward-facing side of the first PTC elastic clamping claw (431), the contact surface of the electrical connector (212) is in contact with the contact surface of the electrical connector (433), the end contact post (213) of the second PTC elastic clamping claw is in contact with the upward-facing side of the end of the second PTC elastic clamping claw (521), and the upper edge contact boss (214) of the second PTC electrical connector is in contact with the upper edge of the second PTC electrical connector (52); a thyristor upper insertion cavity (215) is formed in the housing cavity (21) and at the position corresponding to the thyristor (3), and the upper part of the thyristor (3) is inserted into the thyristor upper insertion cavity (215).

10. A compressor PTC starter according to claim 1, characterized in that: A cover latch (25) is formed on the outer wall of the left and right sides of the cover (2), and a latch mating seat (12) is formed on the outer wall of the left and right sides of the housing (1) at the position corresponding to the cover latch (25). The cover latch (25) and the latch mating seat (12) are mated.

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