CN215956296U

CN215956296U - Contactless starter for refrigeration compressor with large working current

Info

Publication number: CN215956296U
Application number: CN202122468752.9U
Authority: CN
Inventors: 赵晓东; 赵云文; 刘利东; 李燕; 汤建国; 葛玲莉; 李俭
Original assignee: Changshu Tianyin Electromechanical Co Ltd
Current assignee: Changshu Tianyin Electromechanical Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2022-03-04
Anticipated expiration: 2031-10-13

Abstract

A contactless starter with large working current for a refrigeration compressor belongs to the technical field of motor starting devices. Including casing, first PTC starting mechanism, second PTC starting mechanism, external terminal and cap, connecting piece and PTC back connection spare before first PTC starting mechanism includes first PTC, and the quantity of first PTC has two and more, and the interval sets gradually in the first PTC starting mechanism holds the intracavity from the right side left, connecting piece is connected with the preceding side surface electricity of each first PTC respectively before the PTC, and the left end of connecting piece still extends a controller connecting pin before the PTC, is connected with the controller electricity, connecting piece is connected with the rear side surface electricity of each first PTC respectively after the PTC, and connecting piece still extends a second PTC starting mechanism connecting pin at the middle part after the PTC. The advantages are that: the large-current support of the contactless starter is realized by utilizing the PTC current automatic balance principle.

Description

Contactless starter for refrigeration compressor with large working current

Technical Field

The utility model belongs to the technical field of motor starting devices, and particularly relates to a contactless starter with large working current for a refrigeration compressor, which is suitable for starting a single-phase motor refrigeration compressor with large working current.

Background

In a refrigeration compressor using a single-phase motor, the single-phase motor is supplied with a single-phase alternating current, and in particular, a capacitor or resistor phase splitting method is often used, and the single-phase motor is composed of a rotor and a stator with a main winding and an auxiliary winding. When the motor is started, the starting circuit of the secondary winding needs to be conducted, the starting torque of the motor is improved by the phase difference between the secondary winding and the main winding, and further the starting performance of the motor is improved. After the motor is started, the auxiliary winding starting circuit can be disconnected, because the auxiliary winding only needs a small auxiliary torque to ensure the stable and efficient work of the motor under the driving of the rotation inertia of the rotor, and the disconnection of the auxiliary winding starting circuit is helpful for improving the normal work efficiency of the motor, therefore, a starter is needed to realize the function of keeping the auxiliary winding starting circuit on for a period of time during starting of the refrigeration compressor using the single-phase motor.

Conventionally, the starter of the refrigeration compressor using the single-phase motor is realized in a relay form, wherein a current type starting relay and a voltage type starting relay are divided, and the starting circuit of the secondary winding is switched on at the beginning of the starting of the motor and the starting circuit of the secondary winding is switched off when the starting of the motor is basically completed by respectively utilizing the change rule of current and voltage of a motor working circuit in the starting process of the motor. The starting relay is mainly characterized in that the movable contact of the relay is pushed by electromagnetic force to realize on-off control of a circuit. It is known that the contact operation of a relay has several major problems: long mechanical action time (compared with the on-off of an electrical switch); noise is generated during the action; the lifetime limit of the contact and the sparking of the contact. Although the mechanical action time of the relay has no great influence on the refrigeration compressor, the influence on the refrigeration compressor is obvious by other problems, for example, action noise greatly influences the customer experience of products, and the service life and electric spark of contacts limit the service life and application occasions of the refrigeration compressor. Therefore, the refrigerant compressor starter is required to be free of contact, and is an important development direction in the industry, such as a PTC (positive temperature coefficient thermistor) starter, a low power consumption starter, a non-power consumption starter, and the like. However, all of these contactless starters have a common problem that they cannot support a refrigeration compressor with a large current, and the reason is the same because these starters use a PTC, and the PTC that is currently available on the market for motor starting allows a maximum operating current of about 10A, and cannot support a larger current. For this reason, the single-phase refrigeration compressors on the market currently having a large operating current can only use a starting relay with contacts, and no suitable contactless starter can be used. The present invention proposes a solution to this problem, making it possible to adapt contactless starters for refrigeration compressors with a high operating current, the solution to be described being created in this context.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a contactless starter for a refrigeration compressor, which has a simple structure, reliable electrical performance and larger working current.

The utility model aims to achieve the aim that the contactless starter for the refrigeration compressor with larger working current comprises a shell with an open upper part, wherein a first PTC starting mechanism accommodating cavity, a controller accommodating cavity and a second PTC starting mechanism accommodating cavity are arranged in the shell in a partitioned manner, the first PTC starting mechanism accommodating cavity is positioned on the right side in the middle of the shell, the controller accommodating cavity is positioned on the left side of the first PTC starting mechanism accommodating cavity, and the second PTC starting mechanism accommodating cavity is positioned on the rear side of the first PTC starting mechanism accommodating cavity and is close to the controller accommodating cavity; a first PTC actuating mechanism disposed within said first PTC actuating mechanism receiving cavity; a controller disposed within said controller-receiving cavity and electrically connected to said first PTC actuating mechanism; the second PTC starting mechanism is arranged in the second PTC starting mechanism accommodating cavity and is electrically connected with the controller; the external terminal comprises an L connecting piece, an S connecting piece, an M connecting piece and a grounding connecting piece; a shell cover, the shell cover is matched with the shell cover at the open position corresponding to the shell, the shell cover is provided with an L connecting piece yielding hole at the right end of the front side of the top wall, an S connecting piece yielding hole at the front end of the left side of the top wall, an M connecting piece yielding hole at the rear end of the left side of the top wall, a grounding connecting piece yielding hole at the right end of the rear side of the top wall, the L connecting piece is arranged on the shell cover corresponding to the L connecting piece yielding hole and stretches out the L connecting piece yielding hole, the S connecting piece is arranged on the shell cover corresponding to the S connecting piece yielding hole and stretches out the S connecting piece yielding hole, the M connecting piece is arranged on the shell cover corresponding to the M connecting piece yielding hole and stretches out the M connecting piece yielding hole, the grounding connecting piece is arranged on the shell cover corresponding to the grounding connecting piece yielding hole and stretches out the grounding connecting piece yielding hole, the method is characterized in that: the first PTC starting mechanism comprises a first PTC, a PTC front connecting piece and a PTC rear connecting piece, wherein the number of the first PTC is two or more, the first PTC front connecting piece and the PTC rear connecting piece are sequentially arranged in the first PTC starting mechanism accommodating cavity at intervals from right to left, the PTC front connecting piece extends from right to left in the first PTC starting mechanism accommodating cavity and is respectively and electrically connected with the front side surface of each first PTC, the left end of the PTC front connecting piece also extends to form a controller connecting pin, the controller connecting pin is inserted into the controller accommodating cavity and is electrically connected with the controller, the PTC rear connecting piece extends from right to left in the first PTC starting mechanism accommodating cavity and is respectively and electrically connected with the rear side surface of each first PTC, the PTC rear connecting piece also extends to form a second PTC starting mechanism connecting pin in the middle part, the second PTC starting mechanism comprises a controller connecting piece, a second PTC and a connecting piece, one end of the second PTC is electrically connected with the controller through a controller connecting piece, the other end of the second PTC is electrically connected with the second PTC starting mechanism connecting pin, one end of the connecting piece is electrically connected with the second PTC starting mechanism connecting pin, the S connecting piece is electrically connected with the controller, and the M connecting piece is electrically connected with the other end of the connecting piece.

In a specific embodiment of the present invention, the controller is a triac, and the controller has an upper pole, a lower pole and a control pole, wherein the upper pole is electrically connected to the S connector, the lower pole is electrically connected to the controller connection pin of the PTC front connector by being in contact therewith, and the control pole extends in the direction of the second PTC starting mechanism and is electrically connected to the controller connection pin by being in contact therewith.

In another embodiment of the present invention, the PTC front connector is provided at a position corresponding to each of the first PTCs with a front elastic pressing pin which presses against a front surface of the first PTC to achieve electrical connection, and the PTC rear connector is provided at a position corresponding to each of the first PTCs with a rear elastic pressing pin which presses against a rear surface of the first PTC to achieve electrical connection.

In another embodiment of the present invention, the front side elastic presser foot and the rear side elastic presser foot are respectively in a splayed shape and form a crisscross positional relationship with each other.

In a further embodiment of the present invention, the first PTC actuating mechanism receiving cavity is formed with a pair of protrusions protruding from the surface of the cavity bottom wall at both ends of the cavity bottom wall corresponding to the length direction of the front elastic presser foot for supporting the first PTC.

In a further specific embodiment of the present invention, the first PTC actuating mechanism accommodating chambers are formed in the first PTC actuating mechanism accommodating chambers and correspond to the respective first PTCs, adjacent two first PTC actuating mechanism accommodating chambers are separated by a partition wall, the partition wall extends from a front side wall to a rear side wall of the first PTC actuating mechanism accommodating chamber, the partition wall is provided with a PTC front connecting member relief notch at an upper portion of the front side, and a gap between the rear side wall of the partition wall and the rear side wall of the first PTC actuating mechanism accommodating chamber is formed as a PTC rear connecting member passage.

In a further specific embodiment of the present invention, the housing has an L connector slot at a position corresponding to the L connector abdicating hole, an S connector slot at a position corresponding to the S connector abdicating hole, an M connector slot at a position corresponding to the M connector abdicating hole, and a ground connector slot at a position corresponding to the ground connector.

In a more specific embodiment of the present invention, the controller connecting member is provided with a fixing hole at the bottom, the second PTC starting mechanism accommodating cavity is provided with a fixing column at a position corresponding to the fixing hole, and the controller connecting member is fixedly mounted with the housing through the cooperation of the fixing hole and the fixing column.

In yet another specific embodiment of the present invention, the housing has a pair of locking grooves formed on the outer walls of the left and right sides, and a pair of snaps formed on the left and right sides of the housing cover and corresponding to the pair of locking grooves, respectively, and the snaps and the locking grooves are engaged with each other.

In a still more specific embodiment of the present invention, the shell is provided with a set of screw fixing holes at the front end of the bottom for fixing with the refrigeration compressor.

Due to the adoption of the structure, compared with the prior art, the utility model has the beneficial effects that: by utilizing the current automatic balance principle of the PTC, when a plurality of parallel first PTC devices work simultaneously, the current in each first PTC device tends to increase in balance and finally reaches the Curie point basically and synchronously, and the large-current support of the non-contact starter is realized.

Drawings

Fig. 1 is an exploded view of the present invention.

Fig. 2 is a schematic structural diagram of the housing cover according to the present invention.

Fig. 3 is a schematic view of the internal assembly of the housing of the present invention.

In the figure: 1. the PTC starting mechanism comprises a shell, 11, a first PTC starting mechanism accommodating cavity, 111, a top protrusion, 112, a first PTC accommodating cavity, 113, a partition wall, 1131, a PTC front connecting piece abdicating notch, 114, a PTC rear connecting piece channel, 12, a controller accommodating cavity, 13, a second PTC starting mechanism accommodating cavity, 131, a fixed column, 14, an L connecting piece slot, 15, an S connecting piece slot, 16, an M connecting piece slot, 17, a grounding connecting piece slot, 18, a clamping groove, 19 and a screw fixing hole; 2. the PTC starting mechanism comprises a first PTC starting mechanism, 21, a first PTC, 22, a PTC front connecting piece, 221, a controller connecting pin, 222, a front side elastic pressure foot, 23, a PTC rear connecting piece, 231, a second PTC starting mechanism connecting pin, 232 and a rear side elastic pressure foot; 3. a controller, 31, an upper pole, 32, a lower pole and 33, a control pole; 4. a second PTC starting mechanism, 41, a controller connecting piece, 411, a fixing hole, 42, a second PTC, 43 and a connecting piece; 5. external connection terminal, 51.L connecting piece, 52.S connecting piece, 53.M connecting piece, 54. grounding connecting piece; 6. the shell cover, 61.L connecting piece abdicating hole, 62.S connecting piece abdicating hole, 63.M connecting piece abdicating hole, 64. grounding connecting piece abdicating hole, 65. hasp.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes in form and not essential to the inventive concept should be regarded as the protection scope of the present invention.

In the following description, any concept related to the directionality (or the directional nature) of up, down, left, right, front, and rear is intended to facilitate understanding by the public, and thus should not be construed as particularly limiting the technical solution provided by the present invention, with respect to the position state in which the drawings are being described.

Referring to fig. 1, the present invention relates to a contactless starter for a refrigeration compressor having a large operating current, which includes a housing 1, a first PTC starting mechanism 2, a controller 3, a second PTC starting mechanism 4, an external terminal 5, and a housing cover 6. The upper portion of the shell 1 is provided with an opening, a first PTC starting mechanism accommodating cavity 11, a controller accommodating cavity 12 and a second PTC starting mechanism accommodating cavity 13 are arranged in the shell 1 in a separated mode, wherein the first PTC starting mechanism accommodating cavity 11 is located on the right side in the middle of the shell 1, the controller accommodating cavity 12 is located on the left side of the first PTC starting mechanism accommodating cavity 11, and the second PTC starting mechanism accommodating cavity 13 is located on the rear side of the first PTC starting mechanism accommodating cavity 11 and is close to the controller accommodating cavity 12. The first PTC starting mechanism 2 is disposed in the first PTC starting mechanism accommodating chamber 11. The controller 3 is arranged in the controller accommodating cavity 12 and is electrically connected with the first PTC starting mechanism 2. The second PTC starting mechanism 4 is disposed in the second PTC starting mechanism accommodating chamber 13 and is electrically connected to the controller 3. The external terminal 5 includes an L connector 51, an S connector 52, an M connector 53, and a ground connector 54, the S connector 52 is electrically connected to the controller 3, and the M connector 53 is electrically connected to the first PTC starting mechanism 2 and the second PTC starting mechanism 4.

Referring to fig. 2 in conjunction with fig. 1, the housing cover 6 is in cover fit with the housing 1 at the open position corresponding to the housing 1, the housing cover 6 is provided with an L-shaped connector yielding hole 61 at the right end of the front side of the top wall, an S-shaped connector yielding hole 62 at the front end of the left side of the top wall, an M-shaped connector yielding hole 63 at the rear end of the left side of the top wall, and the housing cover 6 is further provided with a grounding-connector yielding hole 64 at the right end of the rear side of the top wall. L connecting piece 51 corresponds to the position-mounting of L connecting piece hole 61 is in the cap 6 on and lean out L connecting piece hole 61, S connecting piece 52 correspond to S connecting piece hole 62 ' S position-mounting be in the cap 6 on and lean out S connecting piece hole 62, M connecting piece 53 correspond to M connecting piece hole 63 ' S position-mounting be in the cap 6 on and lean out M connecting piece hole 63, ground connection 54 corresponds to ground connection piece hole 64 ' S position-mounting be in the cap 6 on and lean out ground connection piece hole 64. The housing 1 is provided with an L connector slot 14 at a position corresponding to the L connector abdicating hole 61, an S connector slot 15 at a position corresponding to the S connector abdicating hole 62, an M connector slot 16 at a position corresponding to the M connector abdicating hole 63, and a ground connector slot 17 at a position corresponding to the ground connector 54.

Referring to fig. 1 and 3, the first PTC starting mechanism 2 includes a first PTC21, a PTC front connector 22, and a PTC rear connector 23. The number of the first PTC21 is two or more, and the first PTC21 is sequentially arranged in the first PTC starting mechanism accommodating chamber 11 at intervals from right to left, in the embodiment, two first PTC21 are illustrated. The PTC front connector 22 extends from right to left in the first PTC actuating mechanism accommodating chamber 11 and also has a controller connection pin 221 extending from the left end, and the controller connection pin 221 is inserted into the controller accommodating chamber 12 and electrically connected to the controller 3. The PTC front connector 22 is provided with front side elastic press pins 222 at positions corresponding to the respective first PTC21, and the front side elastic press pins 222 are pressed against the front side surface of the first PTC21 to achieve electrical connection with the first PTC 21. The PTC rear connector 23 extends from right to left in the first PTC actuating mechanism accommodating chamber 11 and also extends in the middle to form a second PTC actuating mechanism connecting pin 231. The PTC rear connector 23 is provided with rear side elastic press pins 232 at positions corresponding to the respective first PTC21, and the rear side elastic press pins 232 are pressed against the rear side surface of the first PTC21 to achieve electrical connection with the first PTC 21. The front elastic presser foot 222 and the rear elastic presser foot 232 are in a splayed shape and form a crisscross positional relationship with each other, and this structure enables the front elastic presser foot 222 and the rear elastic presser foot 232 to effectively contact with the first PTCs 21. The first PTC starting mechanism accommodating chamber 11 is formed with a pair of protrusions 111 protruding from the surface of the chamber bottom wall at both ends of the chamber bottom wall corresponding to the longitudinal direction of the front elastic presser foot 222, for supporting the first PTC 21. Further, first PTC receiving chambers 112 are formed in the first PTC starting mechanism receiving chamber 11 and corresponding to the respective first PTCs 21, and adjacent two first PTC receiving chambers 112 are partitioned by a partition wall 113. The partition wall 113 extends from the front side wall to the rear side wall of the first PTC starting mechanism accommodating chamber 11, a PTC front connector receding notch 1131 is formed at the upper part of the front side of the partition wall 113, and a gap between the rear side wall of the partition wall 113 and the rear side wall of the first PTC starting mechanism accommodating chamber 11 forms a PTC rear connector passage 114.

The second PTC starting mechanism 4 includes a controller connector 41, a second PTC42 and a connecting piece 43. One end of the second PTC42 is contacted with the controller connecting piece 41 to realize electric connection, the controller connecting piece 41 is electrically connected with the controller 3, the controller connecting piece 41 is provided with a fixing hole 411 at the bottom, the second PTC starting mechanism accommodating cavity 13 is provided with a fixing column 131 at the position corresponding to the fixing hole 411, and the controller connecting piece 41 is fixedly installed with the shell 1 through the matching of the fixing hole 411 and the fixing column 131. The other end of the second PTC42 is in close contact with and electrically connected to the second PTC actuating mechanism connecting pin 231. One end of the connecting piece 43 is electrically connected with the connecting pin 231 of the second PTC starting mechanism by welding or riveting, and the other end of the connecting piece 43 is electrically connected with the M-shaped connecting piece 53.

The controller 3 is a triac, the controller 3 has an upper electrode 31, a lower electrode 32 and a control electrode 33, the upper electrode 31 and the S-connector 52 are electrically connected by welding or riveting, the lower electrode 32 is electrically connected by being in contact with a controller connection pin 221 of the PTC front connector 22, and the control electrode 33 extends in the direction of the second PTC starter 4 and is electrically connected by being in contact with a controller connector 41.

The shell 1 is provided with a pair of clamping grooves 18 on the outer walls of the left side and the right side respectively, a pair of hasps 65 are arranged on the left side and the right side of the shell cover 6 and corresponding to the positions of the pair of clamping grooves 18 respectively, and the hasps 65 are buckled with the clamping grooves 18.

The single-phase alternating current motor is mainly used for starting a refrigerating compressor of the single-phase alternating current motor with larger working current, the single-phase alternating current motor is provided with a stator consisting of at least one main winding and one auxiliary winding, the leading-out end of the main winding of the motor is M, the leading-out end of the auxiliary winding of the motor is S corresponding to the M connecting piece 53, the leading-out end of the auxiliary winding of the motor is L corresponding to the S connecting piece 52, and the leading-out end of the main winding and the auxiliary winding of the motor is L corresponding to the L connecting piece 51, wherein the leading-out end of the main winding of the motor is M connected with one power supply end N of an external single-phase alternating current power supply, and the leading-out end of the main winding and the auxiliary winding of the motor is L and forms the other power supply end of the external single-phase alternating current power supply. When in use, the shell 1 is fixed with the refrigeration compressor through a group of screw fixing holes 19 arranged at the front end of the bottom, so that the utility model is connected into a starting circuit of the compressor. With reference to fig. 1, the first PTC21 and the second PTC42 are both PTC thermistors, and in this embodiment, the number of the first PTC21 is two. The electrical connection relation of the scheme is as follows: one end of the two first PTC21 which are connected in parallel with each other and one end of the second PTC42 are connected with one end of a starting capacitor of the refrigeration compressor together, the other end of the starting capacitor of the refrigeration compressor is connected with a power supply end N, the other end of the two first PTC21 which are connected in parallel with each other are electrically connected with a lower pole 32 (a T2 pole of the bidirectional thyristor) of the controller 3, the other end of the second PTC42 is electrically connected with a control pole 33 (a trigger pole G of the bidirectional thyristor) of the controller 3, and an upper pole 31 (a T1 pole of the bidirectional thyristor) of the controller 3 is electrically connected with a leading-out end S of a secondary winding of a motor of the single-phase alternating current motor through an S connecting piece 52. The L connecting piece 51 is electrically connected with the combined leading-out end L of the secondary winding, the M connecting piece 53 is electrically connected with the leading-out end M of the main winding of the motor, and the grounding connecting piece 54 is connected with the power ground.

The working principle of the scheme is that a plurality of first PTC21 are connected in parallel, and the high-current support of the parallel PTC is realized by utilizing the current automatic balance principle of the PTC. Specifically, when current passes through a plurality of first PTCs 21 of the same specification or similar parameters connected in parallel, the first PTC21 with a smaller resistance value will have a larger current passing through, resulting in larger heat generation of the first PTC21, and due to the PTC temperature coefficient variation characteristics of the PTCs, the resistance value of the first PTC21 will become larger, thereby tending to hinder the current increase in the first PTC 21. Similarly, the current in the first PTC21, which is larger in resistance value, is correspondingly smaller, which hinders the tendency in which the current increases also smaller, and thus the current tends to become larger. Thus, when multiple parallel first PTCs 21 are operating simultaneously, the current in each first PTC21 will tend to increase in balance and eventually reach the curie point substantially simultaneously.

Claims

1. A contactless starter for a refrigeration compressor with large working current comprises a shell (1) with an open upper part, wherein a first PTC starting mechanism accommodating cavity (11), a controller accommodating cavity (12) and a second PTC starting mechanism accommodating cavity (13) are arranged in the shell (1) in a partitioned mode, the first PTC starting mechanism accommodating cavity (11) is located on the right side in the middle of the shell (1), the controller accommodating cavity (12) is located on the left side of the first PTC starting mechanism accommodating cavity (11), and the second PTC starting mechanism accommodating cavity (13) is located on the rear side of the first PTC starting mechanism accommodating cavity (11) and is close to the controller accommodating cavity (12); a first PTC starter mechanism (2), wherein the first PTC starter mechanism (2) is arranged in the first PTC starter mechanism accommodating cavity (11); a controller (3), wherein the controller (3) is arranged in the controller accommodating cavity (12) and is electrically connected with the first PTC starting mechanism (2); a second PTC starting mechanism (4), wherein the second PTC starting mechanism (4) is arranged in the second PTC starting mechanism accommodating cavity (13) and is electrically connected with the controller (3); the external terminal (5) comprises an L connecting piece (51), an S connecting piece (52), an M connecting piece (53) and a grounding connecting piece (54); a cap (6), cap (6) join in marriage with casing (1) lid at the uncovered position that corresponds to casing (1), cap (6) seted up L connecting piece hole (61) of stepping down at the front side right-hand member of roof, S connecting piece hole (62) of stepping down has been seted up at the left side front end of roof, and M connecting piece hole (63) of stepping down has been seted up at the left side rear end of roof, cap (6) still seted up ground connection spare hole (64) of stepping down at the rear side right-hand member of roof, L connecting piece (51) correspond to the position that L connecting piece hole (61) were stepped down is installed cap (6) on and the L connecting piece hole (61) of stepping down is explored, S connecting piece (52) correspond to the position of S connecting piece hole (62) install cap (6) on and the S connecting piece hole (62) of stepping down is explored, M connecting piece (53) correspond to the position of M connecting piece hole (63) install cap (6) on and the cap (6) and the hole (62) of stepping down is explored M connecting piece hole (63) of stepping down, ground connection spare (54) correspond to ground connection spare hole (64) the position install cap (6) on and stretch out ground connection spare hole (64) of stepping down, its characterized in that: the first PTC starting mechanism (2) comprises two or more PTC (21), PTC front connecting pieces (22) and PTC rear connecting pieces (23), the first PTC (21) is sequentially arranged in the first PTC starting mechanism accommodating cavity (11) at intervals from right to left, the PTC front connecting pieces (22) extend from right to left in the first PTC starting mechanism accommodating cavity (11) and are respectively electrically connected with the front side surfaces of the first PTC (21), the left end of the PTC front connecting pieces (22) also extends to form a controller connecting pin (221), the controller connecting pin (221) is inserted into the controller accommodating cavity (12) and is electrically connected with the controller (3), the PTC rear connecting pieces (23) extend from right to left in the first PTC starting mechanism accommodating cavity (11) and are respectively electrically connected with the rear side surfaces of the first PTC (21), the PTC rear connecting piece (23) is also provided with a second PTC starting mechanism connecting pin (231) extending out of the middle part, the second PTC starting mechanism (4) comprises a controller connecting piece (41), a second PTC (42) and a connecting piece (43), one end of the second PTC (42) is electrically connected with the controller (3) through the controller connecting piece (41), the other end of the second PTC (42) is electrically connected with the second PTC starting mechanism connecting pin (231), one end of the connecting piece (43) is electrically connected with the second PTC starting mechanism connecting pin (231), the S connecting piece (52) is electrically connected with the controller (3), and the M connecting piece (53) is electrically connected with the other end of the connecting piece (43).

2. The contactless starter for a refrigeration compressor with a large operating current according to claim 1, characterized in that the controller (3) is a triac, the controller (3) has an upper pole (31), a lower pole (32) and a control pole (33), the upper pole (31) is electrically connected to the S-connector (52), the lower pole (32) is electrically connected to the controller connection pin (221) of the PTC front connector (22), and the control pole (33) extends in the direction of the second PTC starting mechanism (4) and is electrically connected to the controller connector (41).

3. The contactless starter for a refrigeration compressor having a large operating current according to claim 1, wherein the PTC front connector (22) is provided with a front side elastic presser foot (222) at a position corresponding to each of the first PTCs (21), the front side elastic presser foot (222) is pressed against a front side surface of the first PTC (21) to achieve electrical connection, the PTC rear connector (23) is provided with a rear side elastic presser foot (232) at a position corresponding to each of the first PTCs (21), and the rear side elastic presser foot (232) is pressed against a rear side surface of the first PTC (21) to achieve electrical connection.

4. Contactless starter for refrigeration compressors with high operating currents according to claim 3, characterized in that said front side elastic presser foot (222) and rear side elastic presser foot (232) are each splayed in shape and form a criss-cross positional relationship with each other.

5. The contactless starter for a refrigerating compressor with a large operating current according to claim 4, wherein said first PTC starter mechanism accommodation chamber (11) is formed with a pair of protrusions (111) protruding from the chamber bottom wall surface on the chamber bottom wall at both ends corresponding to the length direction of said front side elastic presser foot (222) for supporting said first PTC (21).

6. The contactless starter for a refrigeration compressor having a large operating current according to claim 1, wherein the first PTC starting means receiving chamber (11) is formed with a first PTC receiving chamber (112) corresponding to each first PTC (21), adjacent two first PTC receiving chambers (112) are partitioned by a partition wall (113), the partition wall (113) extends from a front side wall to a rear side wall of the first PTC starting means receiving chamber (11), the partition wall (113) is provided with a PTC front-connector receding notch (1131) at an upper portion of the front side, and a gap between the rear side wall of the partition wall (113) and the rear side wall of the first PTC starting means receiving chamber (11) is formed as a PTC rear-connector passage (114).

7. The contactless starter for a refrigeration compressor with a large operating current according to claim 1, wherein the housing (1) is provided with an L connector slot (14) at a position corresponding to the L connector recess hole (61), an S connector slot (15) at a position corresponding to the S connector recess hole (62), an M connector slot (16) at a position corresponding to the M connector recess hole (63), and an earth connector slot (17) at a position corresponding to the earth connector (54).

8. The contactless starter for a refrigeration compressor with a large operating current according to claim 1, characterized in that the controller connecting member (41) is provided with a fixing hole (411) at the bottom, the second PTC starting mechanism accommodating chamber (13) is provided with a fixing post (131) at a position corresponding to the fixing hole (411), and the controller connecting member (41) is fixedly mounted to the housing (1) by the cooperation of the fixing hole (411) and the fixing post (131).

9. The contactless starter for a refrigerating compressor having a large operating current according to claim 1, wherein said housing (1) is formed with a pair of catching grooves (18) on outer walls of left and right sides, respectively, and a pair of snaps (65) are formed on left and right sides of said housing cover (6) at positions corresponding to said pair of catching grooves (18), respectively, said snaps (65) and catching grooves (18) being engaged with each other.

10. Contactless starter for refrigeration compressors with high operating currents according to claim 1, characterized in that said housing (1) is provided at the front end of the bottom with a set of screw fixing holes (19) for fixing with the refrigeration compressor.