CN215187850U - Integrated multi-terminal motor starting protector for refrigeration compressor - Google Patents

Abstract

An integrated multi-terminal motor starting protector for a refrigeration compressor belongs to the technical field of refrigeration compressors. The starter comprises a shell, a first pin and a second pin, wherein the shell is provided with a starter accommodating cavity, a first pin accommodating cavity and a second pin accommodating cavity; the shell cover is matched with the position of the shell opening on the side, facing downwards, of the shell; starter, protector and external terminal mechanism, the starter is established and is held the intracavity at the starter, and the internal diameter of the first, second jack of shell from top to bottom reduces and form the circular cone hole, and external terminal mechanism is inserted with the cap and is joined in marriage, characteristics: there is the protector to insert on the left wall body of shell and inlays the seat, and the front flank of shell is stretched out to the front end that the protector inserted the seat, the trailing flank of shell is stretched out to the rear end, and the protector inserts the seat and has the protector and inserts the chamber, and the shape that the protector inserted the chamber is semicircular, and the shape of protector and the shape that the protector inserted the chamber suit, and both insert each other and join in marriage. The requirements for miniaturization of volume, modularization of structure, rapidness of assembly and convenience of inspection, maintenance and replacement are met.

Description

Integrated multi-terminal motor starting protector for refrigeration compressor

Technical Field

The utility model belongs to the technical field of the compressor, concretely relates to integral type multiterminal motor starting protector that compressor used for start and protect the compressor motor.

Background

The starting protector is a general name of the starter and the protector. Since the motor of the conventional refrigeration compressor is a low-power single-phase ac motor, a starter is required to assist the starting at the time of starting, and an overload protector (i.e., the aforementioned "protector") is required to perform protection after the compressor enters a normal operation state. In particular, the overload protector ensures that the power supply is cut off when the overload situation occurs in the running process of the refrigeration compressor, so that the compressor is prevented from overheating and causing damage.

Earlier, the starter and the protector were generally designed as separate split structures and each connected in a separate electrical assembly in the electrical circuit of the refrigerant compressor. For example, three sockets are formed in the starter, and are plugged into a compressor standard interface (conventionally referred to as a "three-wire post") of the refrigeration compressor, which is formed by three conductive rods (also referred to as "conductor rods"), and the protector is packaged in an independent state in a separately configured box body such as a bakelite box, and is connected to an electrical circuit of the refrigeration compressor through a transition junction box or a terminal block on the starter. Since the electrical connection is performed manually, it is easy to make mistakes, it is difficult to ensure the quality of the electrical connection and to improve the assembly efficiency of the product, and the electrical reliability of the system is affected by too many connectors.

From the above description, it can be determined without doubt that: combining the starter and the protector has a good positive significance, and is not disclosed in the published chinese patent documents, such as CN2606490Y (motor start, protector), CN2606491Y (integrated motor start, protector), CN2664280Y (motor starter with improved structure), CN100581043C (energy-saving integrated single-phase ac motor start, protector), CN102386815A (integrated motor start protector with improved structure), CN101369790A (energy-saving integrated single-phase ac motor start, protector), CN206211857U (refrigeration compressor start protector without power consumption), CN106385204A (refrigeration compressor start protector without power consumption) and CN104734570A (start protector without power consumption energy-saving single-phase ac motor start), to name a few.

As is known in the art, as various electronic and electrical components are miniaturized, modularized, and convenient to install and/or maintain, the motor start protector is also developed. However, since the shape of the protector disclosed in the above-mentioned patent is not limited to a cylindrical shape, it is necessary to extend a cylindrical protector seat on the outer wall of the rectangular housing at a position located at one corner of the outer wall of the housing, and insert the protector into the protector seat (see, specifically, CN104734570A mentioned above), which, on one hand, limits the idea of the protector that tends to be flat, on the other hand, is not enough to ensure the miniaturization of the volume of the whole housing (for designing the starter and the housing of the protector) and to meet the desired strength requirement, and on the other hand, makes the shape of the whole housing mismatched, which results in that the mold for manufacturing the plastic housing becomes complicated and increases the mold cost, which, on the other hand, is not conducive to efficient and automatic assembly in the production process.

Chinese patent CN101320661B recommends "overload protector with explosion-proof structure", which realizes the design of the protector to be flat and can block the arc that may be generated when the moving contact is disconnected from the meter contact, so as to avoid leakage to the outside and even initiate the explosion of combustible gas or steam. However, this patent does not give any technical teaching of the integration with the starter, and therefore it is necessary to make a rational design, and the technical solutions described below are made in this context.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an integral type multi-terminal motor starting protector that refrigeration compressor that helps satisfying the miniaturization of volume, the modularization of structure, the shortcut of assembly, the convenience of inspection and maintenance change and the cheapness requirement of economy requires.

The task of the utility model is accomplished in this way, an integral type multi-terminal motor starting protector for a refrigeration compressor, comprising a housing having a starter accommodating chamber, a first pin accommodating chamber I and a second pin accommodating chamber II, a positive temperature coefficient thermistor left supporting flange and a positive temperature coefficient thermistor right supporting flange corresponding to each other and protruding from the surface of the bottom wall of the starter accommodating chamber are formed in the middle of the starter accommodating chamber in the starter accommodating chamber, the first pin accommodating chamber I and the second pin accommodating chamber II are respectively surrounded by pin accommodating chamber stacks at the positions corresponding to the left side of the starter accommodating chamber, a housing first jack I is formed on the housing and at the position corresponding to the first pin accommodating chamber I, the housing first jack I communicates the first pin accommodating chamber I with the outside, a shell second jack II is formed on the shell and at a position corresponding to the second pin accommodating cavity II, the second pin accommodating cavity II is communicated with the outside through the shell second jack II, and the left supporting flange of the positive temperature coefficient thermistor corresponds to a position between the opposite sides of the right ends of the first pin accommodating cavity I and the second pin accommodating cavity II which are formed by surrounding the stacking edges of the pin accommodating cavities; the shell cover is matched with the part of the shell opening on the side, facing downwards, of the shell; the starter is arranged in a starter accommodating cavity in a state of being supported between a left supporting flange and a right supporting flange of the positive temperature coefficient thermistor and stretching into the shell cover, and is respectively inserted and matched with a first plug pin accommodating cavity I and a second plug pin accommodating cavity II of the shell at positions corresponding to the first plug pin accommodating cavity I and the second plug pin accommodating cavity II, and the inner diameters of the first plug pin accommodating cavity I and the second plug pin accommodating cavity II of the shell are reduced from top to bottom to form a conical hole; the external terminal mechanism is inserted and matched with the shell cover at a position corresponding to the lower part of the shell cover, penetrates the shell cover upwards to extend into the starter accommodating cavity to be electrically connected with the starter, and is characterized in that a protector inserting and embedding seat extends leftwards on the left wall body of the shell, the front end of the protector inserting and embedding seat extends out of the front side surface of the shell, the rear end of the protector inserting and embedding seat extends out of the rear side surface of the shell, the protector inserting and embedding seat is provided with a protector inserting and embedding cavity, one upward side of the protector inserting and embedding cavity forms an opening of the protector inserting and embedding cavity, one downward side of the protector inserting and embedding cavity forms a yielding port, the shape of the protector inserting and embedding cavity is semicircular, and the shape of the protector is matched with the shape of the protector inserting and is inserted and embedded and matched with the protector inserting and embedding cavity.

In a specific embodiment of the present invention, a first electrical insertion sheet limiting stop pin i, a second electrical insertion sheet limiting stop pin ii and a positive temperature coefficient thermistor probing limiting cavity are formed on a side of the housing cover facing the starter accommodating cavity of the housing, the first electrical insertion sheet limiting stop pin i and the second electrical insertion sheet limiting stop pin ii correspond to each other, and the positive temperature coefficient thermistor probing limiting cavity is located between the first electrical insertion sheet limiting stop pin i and the second electrical insertion sheet limiting stop pin ii; the starter comprises a positive temperature coefficient thermistor, a first electric inserting piece I and a second electric inserting piece II, wherein the positive temperature coefficient thermistor is arranged in a longitudinal state, the upper part of the positive temperature coefficient thermistor is supported between a left supporting flange of the positive temperature coefficient thermistor and a right supporting flange of the positive temperature coefficient thermistor, the lower part of the positive temperature coefficient thermistor stretches into a limited cavity, the front side of the first electric inserting piece I is electrically contacted with the rear side of the positive temperature coefficient thermistor, the rear side of the first electric inserting piece I is limited by the first electric inserting piece limiting blocking pin I, the first electric inserting piece I is provided with a first electric inserting piece pin I and an electric connecting pin, the first electric inserting piece pin I stretches into the first pin containing cavity I and corresponds to the first inserting hole I of the shell, the electric connecting pin is inserted into the shell cover and extends to the lower part of the shell cover, the rear side of a second electric inserting piece II is in electrical contact with the front side of the positive temperature coefficient thermistor, the front side of the second electric inserting piece II is limited by a second electric inserting piece limiting blocking pin II, the second electric inserting piece II is provided with a second electric inserting piece pin II and an external terminal electric connecting inserting piece pin, the second electric inserting piece pin II extends into the second pin accommodating cavity II and corresponds to a second inserting hole II of the shell, and the external terminal mechanism extends into the starter accommodating cavity and is electrically connected with the external terminal electric connecting inserting piece pin; the first jack I of shell and the second jack II of shell are connected with the three-wire column electrical connection of compressor with plug mode under the user state.

In another specific embodiment of the present invention, the protector comprises a shield cover, a shield cover cap, an insert spring, a heating wire, a bimetal, a first electrical connector i, a second electrical connector ii, a stationary contact pin, a movable contact and a protector pin, wherein a stationary contact pin insert flange cavity, an insert spring positioning cavity, an insert spring pin supporting cavity, an electric heating wire cavity and an electrical connector positioning cavity are formed on the right side of the shield cover, the stationary contact pin insert flange cavity is located above the rear portion of the right side of the shield cover and a pair of stationary contact pin positioning flange insert grooves corresponding to each other are formed on the cavity bottom wall of the stationary contact pin insert flange cavity, the pair of stationary contact pin positioning flange insert grooves penetrate through the cavity bottom wall of the stationary contact pin insert flange cavity to communicate with the outside, the insert spring positioning cavity corresponds to the lower portion of the stationary contact pin insert flange cavity and a insert spring positioning insert groove is formed on the cavity bottom wall of the insert spring positioning cavity, the insert positioning insert groove penetrates through the cavity bottom wall of the insert groove insert spring positioning cavity to communicate with the outside, the spring pin supporting cavity is formed at the edge part of the rear lower part of the right side of the protective cover at the position corresponding to the spring positioning cavity and is communicated with the spring positioning cavity, the electric heating wire cavity is formed at the center position of the right side of the protective cover, the electric connecting piece positioning cavity is positioned in front of the right side of the protective cover, an electric connecting piece positioning embedded foot groove penetrating through the cavity bottom wall of the electric connecting piece positioning cavity is formed on the cavity bottom wall of the electric connecting piece positioning cavity, the base part of the inserting spring is positioned in the spring positioning cavity and is bent at the base part of the inserting spring to form an inserting spring positioning embedded foot, the inserting spring positioning embedded foot is embedded and fixed with the inserting spring positioning embedded foot inserting groove, an inserting spring used for being connected with an electric circuit in series extends from one side of the inserting spring facing to the spring pin supporting cavity, the inserting spring foot is tightly attached to and supported on the spring pin supporting cavity and extends out of the lower surface of the protective cover, an electric heating wire inserting spring electric connecting lug extends from the front side surface of the base part of the inserting spring, the electric heating wire inserting spring electric connecting lug extends into the electric heating wire cavity, the electric heating wire is embedded in the electric heating wire cavity in a C-shaped state, a first connecting end I of the electric heating wire is connected with the electric heating wire inserting spring electric connecting lug, a second connecting end II of the electric heating wire is connected with a first electric connecting piece I, a bimetallic strip covers the right side of the electric heating wire, the first electric connecting piece I is arranged in the electric connecting piece positioning cavity, an electric connecting piece limiting strip extends from the lower part of the first electric connecting piece I, the second connecting end II of the electric heating wire is connected with the electric connecting piece limiting strip, an electric connecting piece positioning embedded foot extends from the electric connecting piece limiting strip and corresponds to the electric connecting piece positioning embedded foot groove, the electric connecting piece positioning embedded foot is embedded in the electric connecting piece positioning embedded foot groove, and the second electric connecting piece II is welded and fixed with the first electric connecting piece I, the static contact pin is arranged in the static contact pin inserting flange cavity, a pair of static contact pin inserting flanges are formed on the static contact pin and correspond to the pair of static contact pin positioning flange inserting grooves, the pair of static contact pin inserting flanges and the pair of static contact pin positioning flange inserting grooves are fixedly inserted and embedded, a static contact is fixed on the static contact pin, one end of the static contact pin, facing the protective cover, penetrates through the protective cover to form a static contact pin electric connecting end, one end of the movable contact piece and the second electric connecting piece II form an integral structure, the middle part of the movable contact piece is attached to the right side of the bimetallic strip, the other end of the movable contact piece is formed into a free end, a movable contact is fixedly welded at a position corresponding to the static contact, the protector pin is embedded on the right side of the protective cover, a protector pin extends to form an electric connecting piece, and the protector pin electric connecting piece is also embedded and matched with the right side of the protective cover, the tail end of the protector pin electric connecting sheet is folded and unfolded to form a protector pin electric connecting sheet electric connecting lug, the electric connecting lug of the protector pin electric connecting sheet is electrically connected with the electric connecting end of the static contact pin, the shield cover is fixed with the shield at the position corresponding to the right side of the shield and is in inserted fit with the protector inserting cavity of the protector inserting seat together with the shield, a shield limiting foot extends upwards from the central position of the upper edge of the left cavity wall of the protector inserting cavity, the end of the limited foot of the shield is resisted on the upper surface of the shield, a pair of shell cover forcing claws extend on the upper part of the shield cover, the pair of case cover pressing claws are contacted with the upward side of the case, a protector pin inserting cavity is formed on the shield cover and between the pair of case cover pressing claws, the protector pin is embedded in the protector pin embedding cavity and is electrically connected with the compressor three-wire column in a plugging mode in a use state.

In still another specific embodiment of the present invention, a plug spring auxiliary leg connecting plate extends on a front side surface of the plug spring and at a position corresponding to a lower side of the heating wire plug spring electrical connection lug, a plug spring auxiliary leg extends on a side of the plug spring auxiliary leg connecting plate which is located toward a lower side in a middle portion in a length direction, the plug spring auxiliary leg is supported on the plug spring auxiliary leg supporting portion of the shield and extends to a lower side of the shield; a spring-inserted auxiliary foot yielding cavity is formed on the left side of the protective cover and at a position corresponding to the spring-inserted auxiliary foot.

In a further embodiment of the invention, a protector electrical lug defining cavity having the same shape as the protector pin electrical lug and communicating with the protector pin insertion cavity is formed on the right side of the shroud cover and at a position corresponding to the protector pin electrical lug, a stationary contact pin electrical connection terminal passing hole is formed in the protector electrical connection tab defining cavity and at a position corresponding to the stationary contact pin electrical connection terminal, the protector pin electrical connection tab is embedded in the protector electrical connection tab defining cavity and the protector pin electrical connection tab is formed to correspond to a front side of the stationary contact pin electrical connection terminal passing hole, and the static contact pin electric connecting end of the static contact pin penetrates upwards through the protective cover at a position corresponding to the static contact pin electric connecting end through hole to ensure that the protector pin electric connecting piece electric connecting lug is electrically connected with the protector pin electric connecting piece in a welding mode.

In still another specific embodiment of the present invention, a moving contact flange is formed at a central left side of the moving contact and at a central position corresponding to the bimetal, and the moving contact flange is in contact with a central position of a right side surface of the bimetal.

In a more specific embodiment of the present invention, a pair of shroud cover insertion fixing columns are formed on the left side of the shroud cover, and a pair of fixing column insertion holes penetrating through the shroud cover are formed on the shroud cover and at positions corresponding to the pair of shroud cover insertion fixing columns, and the pair of shroud cover insertion fixing columns and the pair of fixing column insertion holes are inserted and fixed; the left side surface of the protective cover is formed into a protective cover arc surface matched with the left cavity wall of the protective cover inserting cavity of the protective cover inserting seat.

In yet another specific embodiment of the present invention, the pair of fixing post insertion holes are formed in the shield cover in a diagonally distributed manner, and the pair of shield cover insertion fixing posts are formed in the shield cover in a diagonally distributed manner.

In yet another specific embodiment of the present invention, an electrical connection pin hole penetrating through the housing cover is formed in the housing cover and at a position corresponding to the electrical connection pin, the electrical connection pin is inserted into the electrical connection pin hole and extends to a position below the housing cover, a first housing cover insertion groove i penetrating through the housing cover is formed at the front end of the housing cover, and a second housing cover insertion groove ii also penetrating through the housing cover is formed at the rear end of the housing cover; the external terminal mechanism comprises a first external terminal inserting piece I and a second external terminal inserting piece II, the first external terminal inserting piece I is inserted and embedded with a first inserting piece embedding groove I of the shell cover and fixed, a first external terminal inserting piece electric connecting pin I extends on the upper portion of the first external terminal inserting piece I and at a position corresponding to the external terminal electric connecting inserting piece pin, a first wiring pin I, a second external terminal inserting piece electric connecting pin II and a third external terminal inserting piece electric connecting pin III extend from the left to the right in sequence at intervals, the first external terminal inserting piece electric connecting pin I extends into the containing cavity of the starter and is inserted and embedded with the external terminal electric connecting inserting piece pin, the first wiring pin I, the second external terminal inserting piece electric connecting pin II and the third external terminal inserting piece electric connecting pin III are positioned below the shell cover, the fourth external terminal insert electric connecting pin IV, the second wiring pin II and the fifth external terminal insert electric connecting pin V are sequentially extended from left to right at intervals from the lower part of the second external terminal insert II, and are positioned below the shell cover and are electrically connected with the refrigerating system control circuit by a line in the use state; a first external terminal inserting piece limiting seat I for limiting the first external terminal inserting piece I is formed on one upward side of the shell cover at a position interval corresponding to the first inserting piece caulking groove I of the shell cover, and a second external terminal inserting piece limiting seat II for limiting the second external terminal inserting piece II is formed at a position interval corresponding to the second inserting piece caulking groove II of the shell cover; a first terminal screw I is provided on the first terminal pin I, and a second terminal screw II is provided on the second terminal pin II.

In yet another specific embodiment of the present invention, a housing cover pin fixing seat is formed on each of the outer walls of the front and rear sides of the housing, and a housing cover pin extends on each of the wall bodies of the front and rear sides of the housing cover, and the housing cover pin corresponds to and fits in the pair of housing cover pin fixing seats.

The utility model provides a technical scheme because extend a protector that has shape semicircular protector to insert and inlay the chamber left on the left wall body of shell and inserted the seat, therefore can insert the protector that inlays the chamber and inlay the chamber with the protector with appearance and protector and insert and inlay the chamber and insert and inlay the cooperation, help satisfying the miniaturization of volume, the modularization of structure, the agility of assembly, examine and protect the convenience and the economic low-priced requirement of changing.

Drawings

Fig. 1 is a structural diagram of an embodiment of the present invention.

Fig. 2 is a perspective assembly structure view of the protector shown in fig. 1.

Fig. 3 is a schematic view of the bottom of the housing shown in fig. 1.

Fig. 4 is a detailed structural view of the cover shown in fig. 1.

Detailed Description

In order to make the technical essence and advantages of the present invention more clear, the applicant below describes in detail the embodiments, but the description of the embodiments is not a limitation of the present invention, and any equivalent changes made according to the inventive concept, which are only formal and not essential, should be considered as the technical scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position state of fig. 1.

First, the applicant needs to state that: in an actual use state, that is, when the present invention is mounted on a refrigeration compressor motor (simply referred to as "refrigeration compressor"), the state of fig. 1 needs to be turned 180 ° with respect to the state shown in fig. 1, and therefore, the upper portion and the direction mentioned below are exactly the lower portion and the direction mentioned below with respect to the use state, and the front and rear mentioned below are exactly opposite in the use state, and the same is true in all cases; the state shown in fig. 3 is the actual state. Based on the foregoing, all descriptions of directionality or orientation below should not be construed as limitations of the present invention.

Referring to fig. 1 and 3, there is shown a housing 1 having a starter receiving chamber 11 shown in fig. 3, a first pin receiving chamber i 12 and a second pin receiving chamber ii 13, a ptc thermistor left support flange 111 and a ptc thermistor right support flange 112 corresponding to each other are formed in the starter receiving chamber 11 and in the middle of the starter receiving chamber 11 with a surface projecting from the chamber bottom wall of the starter receiving chamber 11, the first pin receiving chamber i 12 and the second pin receiving chamber ii 13 are each surrounded by a pin receiving chamber step 16 at a position corresponding to the left side of the starter receiving chamber 11, that is, the first pin receiving chamber i 12 and the second pin receiving chamber ii 13 are surrounded by a pin receiving chamber step 16 at a position of the housing 1 facing the wall body of the one side of the starter receiving chamber 11, a first plug hole I14 a of the housing is formed in the housing 1 at a position corresponding to the first plug-receiving chamber I12, the first plug-receiving chamber I12 is communicated with the outside through the first plug hole I14 a of the housing, a second plug hole II 14b of the housing is formed in the housing 1 at a position corresponding to the second plug-receiving chamber II 13, the second plug-receiving chamber II 13 is communicated with the outside through the second plug hole II 14b of the housing, and the left support flange 111 of the PTC thermistor is arranged between the right end facing sides of the first plug-receiving chamber I12 and the second plug-receiving chamber II 13 surrounded by the plug-receiving chamber rib 16; a cover 2 is shown, which cover 2 cooperates with a portion of the housing 1 facing downwards (upwards if in use, the same applies hereinafter) at the housing opening 14c (shown in fig. 3); showing a starter 3, a protector 4 and an external terminal mechanism 5, the starter 3 is arranged in the starter accommodating cavity 11 in a state of being supported between the left PTC thermistor supporting flange 111 and the right PTC thermistor supporting flange 112 and being inserted into the case cover 2, and is respectively inserted into the first case insertion hole I14 a and the second case insertion hole II 14b at positions corresponding to the first case insertion hole I12 and the second case insertion hole II 13, and the inner diameters of the first case insertion hole I14 a and the second case insertion hole II 14b are reduced from top to bottom to form conical holes; the external terminal mechanism 5 is inserted into the housing cover 2 at a position corresponding to the lower part of the housing cover 2, and the external terminal mechanism 5 upwards penetrates through the housing cover 2 to extend into the starter accommodating cavity 11 to be electrically connected with the starter 3, wherein the conical hole can also be called a conical hole or a horn-shaped hole, and the hole has good guiding effect, for example, the hole can be quickly and reliably inserted into the refrigeration compressor in a use state, namely when the first insertion hole I14 a and the second insertion hole II 14b of the housing are inserted into two of three wire columns of the refrigeration compressor.

As the technical scheme provided by the utility model: a protector insert seat 15 extends leftward on the left wall body of the housing 1, the front end of the protector insert seat 15 protrudes out of the front side surface of the housing 1, the rear end of the protector insert seat 15 protrudes out of the rear side surface of the housing 1, and the protector insert seat 15 has a protector insert cavity 151, the upward side of the protector insert cavity 151 constitutes a protector insert cavity opening 152, and the downward side constitutes a yield opening 153, and the shape of the protector insert cavity 151 is semicircular, the shape of the protector 4 is adapted to the shape of the protector insert cavity 151 and is in insert fit with the protector insert cavity 151. As shown in fig. 1 and 3, although the applicant previously referred to the shape of the protector insert cavity 151 as a semicircle, it may be referred to as a D-shape or an arcuate shape.

A first electrical insert piece limiting stop pin I21, a second electrical insert piece limiting stop pin II 22 and a positive temperature coefficient thermistor probing limiting cavity 23 are formed on one side of the shell cover 2 facing the starter accommodating cavity 11 of the shell 1, the first electrical insert piece limiting stop pin I21 and the second electrical insert piece limiting stop pin II 22 correspond to each other, namely the first electrical insert piece limiting stop pin I21 and the second electrical insert piece limiting stop pin II 22 correspond to each other in a front-back manner, the positive temperature coefficient thermistor probing limiting cavity 23 is positioned between the first electrical insert piece limiting stop pin I21 and the second electrical insert piece limiting stop pin II 22, the starter 3 comprises a positive temperature coefficient thermistor 31, a first electrical insert piece I32 and a second electrical insert piece II 33, the positive temperature coefficient thermistor 31 is arranged in a longitudinal state, and the upper edge part of the positive temperature coefficient thermistor 31 is supported on the left supporting flange 111 of the positive temperature coefficient thermistor and the positive temperature coefficient thermistor The lower part of the first electrical insert I32 is inserted into the limited cavity 23 of the PTC thermistor, the front side of the first electrical insert I32 is electrically contacted with the rear side of the PTC thermistor 31 through a press-holding spring in a shape of a Chinese character 'ji', the rear side of the first electrical insert I32 is limited by the first electrical insert limiting stop pin I21, the first electrical insert I32 is provided with a first electrical insert pin I321 and an electrical connection pin 322, the first electrical insert pin I321 is inserted into the first pin accommodating cavity I12 and corresponds to the first insertion hole I14 a of the shell, the electrical connection pin 322 is inserted into the shell cover 2 and extends to the lower part of the shell cover 2, the rear side of the second electrical insert II 33 is electrically contacted with the front side of the PTC thermistor 31 through a spring in a shape of a Chinese character 'ji', the front side of a second electric inserting piece II 33 is limited by the second electric inserting piece limiting stop pin II 22, the second electric inserting piece II 33 is provided with a second electric inserting piece pin II 331 and an external terminal electric connecting inserting piece pin 332, the second electric inserting piece pin II 331 extends into the second pin accommodating cavity II 13 and corresponds to the shell second inserting hole II 14b, and the external terminal mechanism 5 extends into the starter accommodating cavity 11 and is electrically connected with the external terminal electric connecting inserting piece pin 332; the first shell jack I14 a and the second shell jack II 14b are electrically connected with the three-wire column of the compressor in a plugging mode in a use state.

Referring to fig. 2 in combination with fig. 1 and 3, the protector 4 includes a shield 41, a shield cover 42, a plug spring 43, a heating wire 44a, a bimetal 44b, a first electrical connector i 45, a second electrical connector ii 46, a stationary contact pin 47, a movable contact 48 and a protector pin 49, a stationary contact pin insertion flange cavity 411, a plug spring positioning cavity 412, a plug spring pin support cavity 413, a heating wire cavity 414 and an electrical connector positioning cavity 415 are formed on the right side of the shield 41, the stationary contact pin insertion flange cavity 411 is located above the rear portion of the right side of the shield 41 and a pair of stationary contact pin positioning flange insertion grooves 4111 corresponding to each other are formed on the cavity bottom wall of the stationary contact pin insertion flange cavity 411, the pair of stationary contact pin positioning flange insertion grooves 4111 penetrate through the cavity bottom wall of the stationary contact pin insertion flange cavity 411 to communicate with the outside, the plug spring positioning cavity 412 corresponds to the lower portion of the stationary contact pin insertion flange cavity 411 and a plug spring positioning insertion groove 4121 is formed on the cavity bottom wall of the plug spring positioning cavity 412, the spring positioning insertion groove 4121 penetrates the cavity bottom wall of the spring positioning cavity 412 to communicate with the outside, the spring positioning support cavity 413 is formed at the edge portion of the rear lower portion of the right side of the shield 41 at a position corresponding to the spring positioning cavity 412 and communicates with the spring positioning cavity 412, the electric heating wire cavity 414 is formed at the right side center position of the shield 41, the electric connector positioning cavity 415 is located at the right side front of the shield 41 and an electric connector positioning insertion groove 4151 penetrating the cavity bottom wall of the electric connector positioning cavity 415 is formed on the cavity bottom wall of the electric connector positioning cavity 415, the base of the insertion spring 43 is located in the spring positioning cavity 412 and bent at the base of the insertion spring 43 to form a spring positioning insertion foot 431, the spring positioning insertion foot 431 is inserted and fixed with the spring positioning insertion groove 4121, a spring insertion foot 432 for connecting with an electric circuit (also called "electric circuit") in series is extended from the side of the insertion spring 43 facing the spring positioning insertion cavity 413, the insertion spring leg 432 is closely and supported on the insertion spring leg supporting chamber 413 and protrudes out of the lower surface of the shield 41, a heating wire insertion spring electrical connection ear 433 extends on the front side surface of the base of the insertion spring 43, the heating wire insertion spring electrical connection ear 433 extends into the heating wire chamber 414, the heating wire 44a is embedded in the heating wire chamber 414 in a C-shaped state, a heating wire first connection end i 441 of the heating wire 44a is connected with the heating wire insertion spring electrical connection ear 433, a heating wire second connection end ii 442 of the heating wire 44a is connected with a first electrical connection member i 45 by welding, as a preferable scheme, a heating wire limiting boss 4141 is formed at the center position of the heating wire chamber 414, the bimetal piece 44b covers the right side of the heating wire 44a, the first electrical connection member i 45 is disposed in the electrical connection member positioning chamber 415, an electrical connection member limiting strip 451 extends from the lower portion of the first electrical connection member i 45, the heating wire second connection terminal ii 442 is connected by welding to an electrical connector defining bar 451, an electrical connector positioning insert 4511 extends from the electrical connector defining bar 451 at a position corresponding to the electrical connector positioning insert groove 4151, the electrical connector positioning insert 4511 is fitted into the electrical connector positioning insert groove 4151, the second electrical connector ii 46 is fixed by welding to the first electrical connector i 45, the stationary contact pin 47 is disposed in the stationary contact pin insertion flange cavity 411, a pair of stationary contact pin insertion flanges 471 is formed on the stationary contact pin 47 at a position corresponding to the pair of stationary contact pin positioning flange insertion grooves 4111, the pair of stationary contact pin insertion flanges 471 is inserted into the pair of stationary contact pin positioning flange insertion grooves 4111, and a stationary contact 472 is fixed to the stationary contact pin 47, the stationary contact pin 47 penetrates the shield cover 42 toward an end of the shield cover 42 to form a stationary contact pin electrical connection terminal 473, one end of the movable contact piece 48 is integrally formed with the second electric connector II 46, the middle portion of the movable contact piece 48 is in contact with the right side of the bimetal piece 44b, the other end of the movable contact piece 48 is formed as a free end and is fixedly welded with a movable contact 481 at a position corresponding to the fixed contact 472, the protector pin 49 is fitted in the right side of the shield cap 42, and the protector pin 49 is extended with a protector pin electric connection piece 491 which is also fitted in the right side of the shield cap 42, the end of the protector pin electric connection piece 491 is folded and unfolded to form a protector pin electric connection piece electric connection lug 4911 which is electrically connected with the fixed contact pin electric connection end 473, the shield cap 42 is fixed to the shield 41 at a position corresponding to the right side of the shield 41 and is fitted in the protector insertion cavity 151 of the shield 15 together with the shield 41, a shield defining leg 1511 extends upward at a central position of an upper edge of a left cavity wall of the protector insertion cavity 151, a tip of the shield defining leg 1511 abuts on an upper surface of the shield 41, a pair of case cover urging holding claws 421 extends at an upper portion of the shield cover 42, the pair of case cover urging holding claws 421 abut on an upward facing side of the aforementioned case 1, a protector pin insertion cavity 422 is further formed at the shield cover 42 and at a position between the pair of case cover urging holding claws 421, and the aforementioned protector pin 49 is inserted in the protector pin insertion cavity 422 and electrically connected to the compressor three-wire pole in a plug-in manner in a use state.

The utility model discloses owing to constitute an organic whole structure with movable contact spring 48 and second electric connector II 46, therefore both can simplify manufacturing process, reduce manufacturing cost, can improve manufacturing efficiency again. The movable contact 481 and the fixed contact 472 described above are preferably silver contacts.

Continuing to refer to fig. 2 in conjunction with fig. 1 and 3, a plug spring auxiliary leg connecting plate 434 for facilitating electrical connection and having a function as desired with respect to the plug spring leg 432 extends on the front side surface of the plug spring 43 at a position corresponding to the lower side of the heating wire plug spring electrical connecting lug 433, a plug spring auxiliary leg 4341 extends on the side of the middle portion of the plug spring auxiliary leg connecting plate 434 in the lengthwise direction facing downward, and the plug spring auxiliary leg 4341 is supported on the plug spring auxiliary leg supporting portion 417 of the shield 41 and extends to the lower side of the shield 41; a spring auxiliary leg relief chamber 423 is formed on the left side of the shroud cover 42 at a position corresponding to the spring auxiliary leg 4341.

As can be seen from the schematic views of fig. 2 and 3, the insertion spring leg 432 and the insertion spring auxiliary leg 4341 correspond to an insertion spring leg fitting cavity 1512 (also referred to as "insertion spring leg avoiding cavity") formed in the bottom wall of the protector insertion cavity 151.

A protector electrical connector defining cavity 425 having the same shape as the protector pin electrical connector 491 and communicating with the protector pin insertion cavity 422 is formed on the right side of the aforementioned protector cover cap 42 and at a position corresponding to the aforementioned protector pin electrical connector 491, a stationary contact pin electrical connection terminal passing hole 4251 is formed in the protector electrical connection terminal defining cavity 425 at a position corresponding to the aforementioned stationary contact pin electrical connection terminal 473, the protector pin electrical connection terminal 491 is embedded in the protector electrical connection terminal defining cavity 425 and the aforementioned protector pin electrical connection terminal electrical connection lug 4911 is formed in front of the stationary contact pin electrical connection terminal passing hole 4251, and the stationary contact pin electrical connection terminal 473 of the aforementioned stationary contact pin 47 is passed through the aforementioned protector cover 42 upward at a position corresponding to the stationary contact pin electrical connection terminal passing hole 4251 to be electrically connected to the aforementioned protector pin electrical connection terminal electrical connection lug 4911 by soldering.

Preferably, a movable contact piece flange 482 is formed at the left side of the middle of the movable contact piece 48 and at a central position corresponding to the bimetal piece 44b, and the movable contact piece flange 482 is in contact with the central position of the right side of the bimetal piece 44 b.

A pair of shroud cover insertion fixing posts 424 are formed on the left side of the shroud cover 42, a pair of fixing post insertion holes 416 penetrating the shroud 41 are formed in the shroud 41 at positions corresponding to the pair of shroud cover insertion fixing posts 424, and the pair of shroud cover insertion fixing posts 424 are inserted and fixed in the pair of fixing post insertion holes 416; the left side surface of the protector 41 is formed as a protector arcuate surface that matches the left cavity wall of the protector insertion cavity 151 of the protector insertion seat 15.

In the present embodiment, the pair of fixing post insertion holes 416 are formed in a diagonally distributed positional relationship with each other on the shroud 41, and the pair of shroud cover insertion fixing posts 424 are formed in a diagonally distributed positional relationship with each other on the shroud 42.

Preferably, after the pair of hood cover insertion fixing posts 424 are completely inserted into the pair of fixing post insertion holes 416 and slightly protrude out of the left side surface of the hood 41, the ends of the pair of hood cover insertion fixing posts 424 are melted by heating and form an expanded edge after cooling, so that the hood 41 and the hood cover 42 are sufficiently secured to each other.

Since the operating principle of the protector 4 is a known technology, for example, refer to the patent documents mentioned in the above background art column by the applicant, and the following description will be made only briefly, since the protector 4 is connected in series to an electric circuit, that is, an electric line, when the bimetal 44b is heated and deformed by the heating wire 44a, an urging force is generated to push the movable contact 48 upward, the movable contact 481 is separated from the fixed contact 472, the circuit, that is, the circuit, is disconnected, and the refrigeration compressor motor is protected. On the contrary, when the heating wire 44a or the heat radiation of the external environment is at a temperature lower than the temperature at which the bimetal 44b is sensed and deformed, the bimetal 44b is reset, the moving and stationary contacts 481 and 472 are closed (electrically contacted with each other), and the motor circuit of the refrigeration compressor is turned on again. As explained for the protector 4, the applicant is not repeated here, since the aforementioned operating principle of the starter 3 is also common knowledge and can likewise be referred to the patent documents mentioned in the background section.

Referring to fig. 4 in conjunction with fig. 1, an electrical connection pin hole 24 penetrating the housing cover 2 is formed on the housing cover 2 at a position corresponding to the electrical connection pin 322, the electrical connection pin 322 is inserted into the electrical connection pin hole 24 and extends to a lower side of the housing cover 2, a first housing cover insert groove i 25 penetrating the housing cover 2 is formed at a front end of the housing cover 2, and a second housing cover insert groove ii 26 also penetrating the housing cover 2 is formed at a rear end of the housing cover 2; the external terminal mechanism 5 comprises a first external terminal inserting piece I51 and a second external terminal inserting piece II 52, the first external terminal inserting piece I51 is inserted and fixed with the first inserting piece embedding groove I25 of the shell cover, a first external terminal inserting piece electric connecting pin I511 extends from the upper part of the first external terminal inserting piece I51 and the position corresponding to the external terminal electric connecting inserting piece pin 332, a first wiring pin I512, a second external terminal inserting piece electric connecting pin II 513 and a third external terminal inserting piece electric connecting pin III 514 extend from the left to the right at intervals in sequence from the lower part of the first external terminal inserting piece I51, the first external terminal inserting piece electric connecting pin I511 extends into the containing cavity 11 of the starter to be inserted and connected with the external terminal electric connecting inserting piece pin 332, the first wiring pin I512, the second external terminal inserting piece electric connecting pin II 513 and the third external terminal inserting piece electric connecting pin 514 are positioned below the shell cover 2, the second external terminal inserting piece II 52 is fixedly inserted into the second inserting piece embedding groove II 26 of the shell cover, a fourth external terminal inserting piece electric connecting pin IV 521, a second wiring pin II 522 and a fifth external terminal inserting piece electric connecting pin V523 sequentially extend from left to right at intervals from the lower part of the second external terminal inserting piece II 52, and the fourth external terminal inserting piece electric connecting pin IV 521, the second wiring pin II 522 and the fifth external terminal inserting piece electric connecting pin V523 are positioned below the shell cover 2 and are electrically connected with the control circuit of the refrigeration system by a line in a use state; a first external terminal insert piece limiting seat I27 a for limiting the first external terminal insert piece I51 is formed on one upward side of the shell cover 2 at a position interval corresponding to the shell cover first insert piece embedding groove I25, and a second external terminal insert piece limiting seat II 27b for limiting the second external terminal insert piece II 52 is formed at a position interval corresponding to the shell cover second insert piece embedding groove II 26; a first terminal screw I5121 is provided to the first terminal pin I512, and a second terminal screw II 5221 is provided to the second terminal pin II 522. Since the manner in which the first external terminal insertion piece i 51 and the second external terminal insertion piece ii 52 are electrically connected to the refrigeration system control circuit is known in the art, and reference can be made to the patent documents mentioned in the above background art column by the applicant, the description thereof is omitted.

Preferably, a housing cover pin fixing seat 17 is formed on each of the front and rear outer walls of the housing 1, and a housing cover pin 28 extends on each of the front and rear wall bodies of the housing cover 2, the position of the housing cover pin 28 corresponding to and mating with the pair of housing cover pin fixing seats 17.

To sum up, the technical solution provided by the present invention remedies the defects in the prior art, successfully completes the invention task, and faithfully embodies the technical effects mentioned in the above technical effect column by the applicant.

Claims (10)

1. An integrated multi-terminal motor starting protector for a refrigeration compressor, comprising a housing (1), the housing (1) having a starter accommodating chamber (11), a first pin accommodating chamber I (12) and a second pin accommodating chamber II (13), a PTC thermistor left support flange (111) and a PTC thermistor right support flange (112) which correspond to each other and are formed in the starter accommodating chamber (11) and in the middle of the starter accommodating chamber (11) to protrude from the surface of the chamber bottom wall of the starter accommodating chamber (11), the first pin accommodating chamber I (12) and the second pin accommodating chamber II (13) each being surrounded by a pin accommodating chamber rim (16) at a position corresponding to the left side of the starter accommodating chamber (11), a housing first insertion hole I (14a) being formed in the housing (1) and at a position corresponding to the first pin accommodating chamber I (12), the first pin accommodating cavity I (12) is communicated with the outside through the first pin accommodating cavity I (14a) of the shell, the second pin accommodating cavity II (13) is communicated with the outside through the second pin accommodating cavity II (14b) of the shell, and the left supporting flange (111) of the positive temperature coefficient thermistor corresponds to a position between the opposite sides of the right ends of the first pin accommodating cavity I (12) and the second pin accommodating cavity II (13) which are formed by enclosing the pin accommodating cavity stack edge (16); the shell cover (2), the shell cover (2) is matched with the part of the shell opening (14c) at the downward side of the shell (1); the starter is arranged in the starter accommodating cavity (11) in a state of being supported between the positive temperature coefficient thermistor left supporting flange (111) and the positive temperature coefficient thermistor right supporting flange (112) and extending into the shell cover (2), and the starter (3) is respectively inserted and matched with the shell first jack I (14a) and the shell second jack II (14b) at positions corresponding to the first pin accommodating cavity I (12) and the second pin accommodating cavity II (13), and the inner diameters of the shell first jack I (14a) and the shell second jack II (14b) are reduced from top to bottom to form conical holes; the external terminal mechanism (5) is inserted into the shell cover (2) at a position corresponding to the lower part of the shell cover (2) and the external terminal mechanism (5) upwards penetrates through the shell cover (2) to extend into the starter accommodating cavity (11) to be electrically connected with the starter (3), and is characterized in that a protector inserting and embedding seat (15) extends leftwards on the left wall body of the shell (1), the front end of the protector inserting and embedding seat (15) extends out of the front side surface of the shell (1), the rear end of the protector inserting and embedding seat (15) extends out of the rear side surface of the shell (1), the protector inserting and embedding seat (15) is provided with a protector inserting and embedding cavity (151), the upward side of the protector inserting and embedding cavity (151) forms a protector inserting and embedding cavity opening (152), the downward side forms a yielding opening (153), and the protector inserting and embedding cavity (151) is semicircular in shape, the shape of the protector (4) is adapted to the shape of the protector insertion cavity (151) and is in insertion fit with the protector insertion cavity (151).

2. The integrated multi-terminal motor starting protector for a refrigeration compressor according to claim 1, characterized in that a first electrical insert limiting stopper i (21), a second electrical insert limiting stopper ii (22) and a ptc thermistor probing limiting cavity (23) are formed at a side of the housing cover (2) facing the starter accommodating cavity (11) of the housing (1), the first electrical insert limiting stopper i (21) and the second electrical insert limiting stopper ii (22) correspond to each other, and the ptc thermistor probing limiting cavity (23) is located between the first electrical insert limiting stopper i (21) and the second electrical insert limiting stopper ii (22); the starter (3) comprises a PTC thermistor (31), a first electrical blade I (32) and a second electrical blade II (33), the PTC thermistor (31) being arranged in a longitudinal position and the upper part of the PTC thermistor (31) being supported between the left PTC thermistor support flange (111) and the right PTC thermistor support flange (112) while the lower part of the PTC thermistor projects into the limiting chamber (23), the front side of the first electrical blade I (32) being in electrical contact with the rear side of the PTC thermistor (31) while the rear side of the first electrical blade I (32) is defined by the first electrical blade limiting stop pin I (21), the first electrical blade I (32) having a first electrical blade I (321) and an electrical connection pin (322), the first electric inserting sheet pin I (321) extends into the first pin accommodating cavity I (12) and corresponds to the first inserting hole I (14a) of the shell, the electric connecting pin (322) is inserted and matched with the shell cover (2) and extends to the lower part of the shell cover (2), the rear side of the second electric inserting sheet II (33) is electrically contacted with the front side of the positive temperature coefficient thermistor (31), the front side of the second electric inserting piece II (33) is limited by the second electric inserting piece limiting stop pin II (22), the second electric inserting piece II (33) is provided with a second electric inserting piece pin II (331) and an external terminal electric connecting inserting piece pin (332), the second electric inserting piece pin II (331) extends into the second pin accommodating cavity II (13) and corresponds to the second inserting hole II (14b) of the shell, the external terminal mechanism (5) extends into the starter accommodating cavity (11) and is electrically connected with the external terminal electrical connection insert pin (332); and the first shell jack I (14a) and the second shell jack II (14b) are electrically connected with the three-wire column of the compressor in a plugging mode in a use state.

3. The integrated multi-terminal motor start protector for a refrigeration compressor according to claim 1, characterized in that the protector (4) comprises a shield (41), a shield cover (42), an insert spring (43), an electric heating wire (44a), a bimetal (44b), a first electric connector I (45), a second electric connector II (46), a stationary contact pin (47), a movable contact piece (48) and a protector pin (49), a stationary contact pin insert flange cavity (411), an insert spring positioning cavity (412), an insert spring pin support cavity (413), an electric heating wire cavity (414) and an electric connector positioning cavity (415) are formed on the right side of the shield (41), the stationary contact pin insert flange cavity (411) is located above the rear portion of the right side of the shield (41) and a pair of stationary contact pin positioning flange insert grooves (4111) corresponding to each other are formed on the cavity bottom wall of the stationary contact pin insert flange cavity (411), the pair of stationary contact pin positioning flange insertion grooves (4111) penetrate through the cavity bottom wall of the stationary contact pin insertion flange cavity (411) to communicate with the outside, the insertion spring positioning cavity (412) corresponds to the lower part of the stationary contact pin insertion flange cavity (411) and is provided with an insertion spring positioning insertion groove (4121) on the cavity bottom wall of the insertion spring positioning cavity (412), the insertion spring positioning insertion groove (4121) penetrates through the cavity bottom wall of the insertion spring positioning cavity (412) to communicate with the outside, the insertion spring pin support cavity (413) is formed at the edge part of the right rear lower part of the shield (41) at the position corresponding to the insertion spring positioning cavity (412) and is communicated with the insertion spring positioning cavity (412), the electric heating wire cavity (414) is formed at the right central position of the shield (41), the electric connector positioning cavity (415) is positioned in front of the right side of the shield (41) and is provided with an electric connector positioning insertion groove (4151) penetrating through the cavity bottom wall of the electric connector positioning cavity (415) on the cavity bottom wall of the electric connector positioning cavity (415), the base of the plug spring (43) is positioned in the plug spring positioning cavity (412) and is bent at the base of the plug spring (43) to form a plug spring positioning embedded pin (431), the plug spring positioning embedded pin (431) is embedded and fixed with the plug spring positioning embedded pin slot (4121), one side of the plug spring (43) facing the plug spring pin supporting cavity (413) extends to form a plug spring pin (432) which is used for being connected with an electric circuit in series, the plug spring pin (432) is closely attached and supported on the plug spring pin supporting cavity (413) and protrudes out of the lower surface of the shield (41), the front side of the base of the plug spring (43) extends to form a heating wire plug spring electric connecting lug (433), the heating wire plug spring electric connecting lug (433) extends into the heating wire cavity (414), the heating wire (44a) is embedded in the heating wire cavity (414) in a C-shaped state, and the first connecting end (441) of the heating wire (44a) is connected with the plug spring I electric connecting lug (433) And a heating wire second connection end II (442) of the heating wire (44a) is connected with a first electrical connector I (45), the bimetallic strip (44b) covers the right side of the heating wire (44a), the first electrical connector I (45) is arranged in the electrical connector positioning cavity (415), an electrical connector limiting strip (451) extends from the lower part of the first electrical connector I (45), the heating wire second connection end II (442) is connected with the electrical connector limiting strip (451), an electrical connector positioning embedded foot (4511) extends on the electrical connector limiting strip (451) and at a position corresponding to the electrical connector positioning embedded foot groove (4151), the electrical connector positioning embedded foot (4511) is embedded in the electrical connector positioning embedded foot groove (4151), a second electrical connector II (46) is welded and fixed with the first electrical connector I (45), a static contact foot (47) is arranged in the static contact foot inserting flange cavity (411), a pair of stationary contact pin insertion flanges 471 is formed on the stationary contact pin 47 at positions corresponding to the pair of stationary contact pin positioning flange insertion grooves 4111, the pair of stationary contact pin insertion flanges 471 is fixed to the pair of stationary contact pin positioning flange insertion grooves 4111 by insertion, and a stationary contact 472 is fixed to the stationary contact pin 47, one end of the stationary contact pin 47 facing the shield cover 42 is formed as a stationary contact pin electrical connection terminal 473 through the shield cover 42, one end of the movable contact piece 48 is formed as an integral structure with the second electrical connection member II 46, a middle portion of the movable contact piece 48 is brought into contact with a right side of the bimetal piece 44b, the other end of the movable contact piece 48 is formed as a free end and a movable contact 481 is fixed by welding at a position corresponding to the stationary contact 472, the protector pin 49 is inserted to a right side of the shield cover 42, and the protector pin (49) is extended with a protector pin electric connection piece (491), the protector pin electric connection piece (491) is also embedded and matched with the right side of the protective cover cap (42), the tail end of the protector pin electric connection piece (491) is folded and expanded to form a protector pin electric connection lug (4911), the protector pin electric connection lug (4911) is electrically connected with the static contact pin electric connection end (473), the protective cover cap (42) is fixed with the protective cover (41) at the position corresponding to the right side of the protective cover (41) and is inserted and matched with the protective cover (41) and the protective cover inserting cavity (151) of the protective cover inserting seat (15), a protective cover limiting pin (1511) extends upwards at the central position of the upper edge of the left cavity wall of the protective cover inserting cavity (151), the tail end of the protective cover limiting pin (1511) is abutted against the upper surface of the protective cover (41), a pair of shell cover pressing claws (421) extend on the upper part of the shield cover (42), the shell cover pressing claws (421) are contacted with the upward side of the shell (1), a protector pin embedding cavity (422) is formed on the shield cover (42) and between the shell cover pressing claws (421), the protector pin (49) is embedded in the protector pin embedding cavity (422) and is electrically connected with the three-wire column of the compressor in a plugging and unplugging mode in a use state.

4. The one-piece multi-terminal motor starting protector for a refrigeration compressor according to claim 3, characterized in that a plug-spring auxiliary leg connection plate (434) extends on a front side surface of the plug spring (43) and at a position corresponding to a lower side of the heating wire plug-spring electrical connection lug (433), a plug-spring auxiliary leg (4341) extends on a side of the plug-spring auxiliary leg connection plate (434) which is directed downward in a middle portion in a length direction, the plug-spring auxiliary leg (4341) is supported on a plug-spring auxiliary leg support portion (417) of the shroud (41) and extends to a lower side of the shroud (41); a spring-assisted foot relief chamber (423) is formed on the left side of the shroud cover (42) at a position corresponding to the spring-assisted foot (4341).

5. The one-piece multi-terminal motor start protector for a refrigeration compressor according to claim 3, characterized in that a protector pin electrical connection piece defining cavity (425) having the same shape as the protector pin electrical connection piece (491) and communicating with said protector pin insertion cavity (422) is formed at a position corresponding to said protector pin electrical connection piece (491) on the right side of said protector cover cap (42), a stationary contact pin electrical connection end passing hole (4251) is opened in the protector electrical connection piece defining cavity (425) and at a position corresponding to said stationary contact pin electrical connection end (473), a protector pin electrical connection piece (491) is inserted in the protector electrical connection piece defining cavity (425) and said protector pin electrical connection piece electrical connection lug (4911) corresponds to the front side of the stationary contact pin electrical connection end passing hole (4251), the static contact pin electric connecting end (473) of the static contact pin (47) penetrates through the protective cover cap (42) upwards at a position corresponding to the static contact pin electric connecting end through hole (4251) so that the protector pin electric connecting piece electric connecting lug (4911) can be electrically connected with the protector pin electric connecting piece electric connecting lug in a welding mode.

6. The one-piece multi-terminal motor start protector for a refrigeration compressor according to claim 3, characterized in that a moving contact flange (482) is formed at a central position corresponding to the center of said bimetal (44b) on the left side of the middle of said moving contact (48), and the moving contact flange (482) is in contact with a central position of the right side of the bimetal (44 b).

7. The integrated multi-terminal motor start protector for a refrigeration compressor according to claim 3, wherein a pair of shroud cover insertion and embedding fixing posts (424) are formed on the left side of the shroud cover (42), and a pair of fixing post insertion and embedding holes (416) penetrating through the shroud (41) are formed on the shroud (41) and at positions corresponding to the pair of shroud cover insertion and embedding fixing posts (424), and the pair of shroud cover insertion and embedding fixing posts (424) are inserted and fixed with the pair of fixing post insertion and embedding holes (416); the left side surface of the shield (41) is formed into a shield arc surface matched with the left cavity wall of the protector inserting cavity (151) of the protector inserting seat (15).

8. The integrated multi-terminal motor start protector for a refrigeration compressor of claim 7, characterized in that said pair of fixing post insertion holes (416) are in diagonally distributed positional relationship with each other on said shroud (41), and said pair of shroud insertion fixing posts (424) are in diagonally distributed positional relationship with each other on said shroud (42).

9. The integrated multi-terminal motor start protector for the refrigeration compressor according to claim 2, characterized in that an electrical connection pin hole (24) penetrating the housing cover (2) is formed in the housing cover (2) at a position corresponding to the electrical connection pin (322), the electrical connection pin (322) is inserted into the electrical connection pin hole (24) and extends to a lower side of the housing cover (2), a first housing cover insert groove i (25) penetrating the housing cover (2) is formed in a front end of the housing cover (2), and a second housing cover insert groove ii (26) also penetrating the housing cover (2) is formed in a rear end of the housing cover (2); the external terminal mechanism (5) comprises a first external terminal inserting piece I (51) and a second external terminal inserting piece II (52), the first external terminal inserting piece I (51) is fixedly inserted into a first inserting piece embedding groove I (25) of the shell cover, a first external terminal inserting piece electrical connecting pin I (511) extends on the upper portion of the first external terminal inserting piece I (51) and at a position corresponding to the external terminal electrical connecting inserting piece pin (332), a first wiring pin I (512), a second external terminal inserting piece electrical connecting pin II (513) and a third external terminal inserting piece electrical connecting pin III (514) sequentially extend from left to right at intervals from the lower portion of the first external terminal inserting piece I (51), the first external terminal inserting piece electrical connecting pin I (511) stretches into the starter accommodating cavity (11) and is connected with the external terminal electrical connecting pin (332) in an inserting and embedding manner, a first wiring pin I (512), a second external terminal insert electric connection pin II (513) and a third external terminal insert electric connection pin III (514) are positioned below the shell cover (2), and is electrically connected with a control circuit of the refrigeration system by a circuit in a use state, the second external terminal inserting piece II (52) is fixedly inserted into the second inserting piece embedding groove II (26) of the shell cover, a fourth external terminal inserting sheet electric connecting pin IV (521), a second wiring pin II (522) and a fifth external terminal inserting sheet electric connecting pin V (523) are sequentially extended from left to right at intervals on the lower part of the second external terminal inserting sheet II (52), the fourth external terminal insert electric connecting pin IV (521), the second wiring pin II (522) and the fifth external terminal insert electric connecting pin V (523) are positioned below the shell cover (2) and are electrically connected with a refrigerating system control circuit by a line in a use state; a first external terminal insert piece limiting seat I (27a) used for limiting the first external terminal insert piece I (51) is formed on one side, facing upwards, of the shell cover (2) at a position interval corresponding to the first insert piece embedding groove I (25) of the shell cover, and a second external terminal insert piece limiting seat II (27b) used for limiting the second external terminal insert piece II (52) is formed at a position interval corresponding to the second insert piece embedding groove II (26) of the shell cover; a first terminal pin I (5121) is provided on the first terminal pin I (512), and a second terminal screw II (5221) is provided on the second terminal pin II (522).

10. An integrated multi-terminal motor start protector for a refrigeration compressor according to claim 1, 2 or 9, characterized in that a housing cover fastening pin fixing seat (17) is formed on each of the front and rear outer walls of the housing (1), and a housing cover fastening pin (28) extends on each of the front and rear wall bodies of the housing cover (2), the housing cover fastening pin (28) being positioned to correspond to and fit into a pair of housing cover fastening pin fixing seats (17).

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