CN115985715A - Overheat protector for motor of refrigeration compressor - Google Patents

Abstract

The utility model provides a compressor motor overheat protector of refrigeration, including the guard shield, the guard shield lid, insert the spring, the heating wire, bimetallic strip, electric connector, the static contact foot, movable contact spring and protector participate in, there is static contact foot at the ascending one side of guard shield orientation and inserts the flange chamber, insert spring location chamber, insert spring foot supporting cavity, electric heating wire chamber and electric connector location chamber, static contact foot inserts the left side of the rear end that inlays the flange chamber and is located the guard shield, it inserts the right-hand side that the flange chamber is inserted to insert corresponding static contact foot in spring location chamber, the electric heating wire chamber constitutes in the ascending one side central point of guard shield orientation, electric connector location chamber is located the front end of guard shield, the basal portion of inserting the spring is located inserts spring location intracavity, the heating wire inlays and is put on the heating wire intracavity, bimetallic strip covers on the heating wire, the movable contact spring is the stainless steel piece and this movable contact spring is fixed towards the one end of electric connector directly with the one side in opposite directions of electric connector. The advantages are that: the number of parts is reduced, the processing efficiency is improved, and the product cost is reduced; the circuit can be quickly disconnected in case of overheat caused by over-current of the compressor.

Description

Overheat protector for motor of refrigeration compressor

Technical Field

The invention belongs to the technical field of motor protection parts of refrigeration compressors, and particularly relates to an overheat protector for a motor of a refrigeration compressor.

Background

The overheat protector for the motor of the refrigeration compressor is also called as a motor overload protector of the refrigeration compressor, and generally needs to be protected by the overheat protector after the refrigeration compressor enters a normal operation state, and the purpose of the overheat protector is as follows: when the overload situation occurs in the running process of the refrigeration compressor, the power supply is cut off, so that the refrigeration compressor is prevented from overheating and causing damage.

As is known in the art, a motor starter for assisting starting is usually provided on a refrigeration compressor in addition to the motor overheat protector, so that in terms of structure and installation form, if the two are formed into an integral structure, the two are integrally installed, and if the two are formed into a split structure, the two are separately installed, the former share a shell or a box, and the latter respectively have corresponding shells or boxes. However, the mechanism of action of the two components is the same whether the components are installed separately or integrally, namely, the mechanism of action is not changed due to the integral or separate installation.

The above-described one-piece mounting form can be fully understood from a reading of the following patent documents, not limited to the examples: such as CN2606490Y (motor start, protector), CN2606491Y (integrated motor start, protector), CN102386815A (structure improved integrated motor start protector), CN101369790A (energy-saving integrated single-phase ac motor start, protector), CN206211857U (refrigeration compressor no-power-consumption start protector), CN106385204A (refrigeration compressor no-power-consumption start protector), CN104734570A (no-power-consumption energy-saving single-phase ac motor start protector), and CN113453474B (integrated multi-terminal motor start protector), etc.

The above-described motor overheat protector in the form of a separate mounting, i.e. constituting a separate structural system, is likewise fully understood on reading the following patent documents, which are not to be considered as limiting: such as CN2093438U (butterfly bimetal temperature protection relay), CN2152301Y (thermal compensation type refrigerator overcurrent over-temperature rise double protector), CN2218263Y (self-protection type refrigeration compressor thermal protector), CN2287339Y (refrigeration compressor motor protector), CN1207743C (thermal protector) and CN2341305Y (current temperature composite type motor protector).

Typical motor overheat protectors are disclosed in documents such as CN2821846Y (a compressor overheat protector), CN208673997U (a thermal protector) and CN215187850U (an integrated multi-terminal motor start protector for a refrigeration compressor), which are all related to motor overheat protectors having the technical effects described in the technical effect column of the specification, and have the following common features in the longitudinal views of the three patents: the movable contact pieces (CN 2821846Y is called as a movable contact spring piece, CN208673997U is called as a spring piece, and CN215187850U is called as a movable contact piece) are all made of copper sheets, namely the movable contact pieces are made of copper; the electric connector electrically connected with the heating wire (also called as a heating wire) is made of stainless steel (for example, CN215187850U called as a first electric connector); a transition connecting piece (CN 2821846Y is called as a gasket, CN208673997U is shown as a component but is not given a reference mark name, and CN215187850U is called as a second electric connecting piece) which is made of stainless steel and is arranged at one end of the movable contact piece corresponding to the electric connecting piece, and one end of the movable contact piece corresponding to the electric connecting piece is welded with the electric connecting piece by the transition connecting piece. Particularly, the transition connecting piece made of stainless steel, the movable contact piece made of copper and the electric connecting piece made of stainless steel are welded, so that the process is troublesome, the transition connecting piece and the movable contact piece are required to be reliably welded, and the transition connecting piece and the electric connecting piece are required to be reliably welded, so that the manufacturing or processing efficiency is affected, the welding reliability cannot completely reach the expectation of the industry, and the reliability of the welding is inevitably unsatisfactory because the stainless steel and the copper belong to dissimilar materials.

Trial and error by the applicant suggest that: the technical problem is that the transition connecting piece made of stainless steel is adopted to connect the movable contact piece made of copper and the electric connecting piece made of stainless steel in a welding manner so as to form the electrical connection between the movable contact piece and the electric connecting piece: firstly, the welding quality between dissimilar materials cannot be guaranteed except that the welding steps are more and the processing efficiency is influenced, namely the welding reliability cannot be correspondingly guaranteed; secondly, in view of the number of the parts, the number of the parts is relatively increased due to the use of the transition connecting piece; thirdly, there is a technical bias that this is not the case, because the movable contact piece is made of copper, although it has good conductivity, its heat distortion performance is the factor that can not compare favorably with stainless steel but has been neglected. It is not limited to the three aspects mentioned above that reasonable improvements are necessary, and the technical solutions described below are made in this context.

Disclosure of Invention

The invention aims to provide a motor overheat protector of a refrigeration compressor, which is beneficial to abandoning a transition connecting piece made of stainless steel, reducing the number of parts, improving the processing efficiency, reasonably reducing the product cost, and obviously improving the thermal deformation effect so as to quickly break a circuit between a movable contact piece with a movable contact and a static contact pin with a static contact under the condition of overheat caused by over-current of the compressor.

The invention aims to accomplish the task by providing a refrigeration compressor motor overheat protector which comprises a protective cover, a protective cover cap, an insertion spring, an electric heating wire, a bimetallic strip, an electric connector, a static contact pin, a movable contact piece and a protector pin, wherein a static contact pin insertion flange cavity, an insertion spring positioning cavity, an insertion spring pin supporting cavity, an electric heating wire cavity and an electric connector positioning cavity are formed on one upward side of the protective cover, the static contact pin insertion flange cavity is positioned on the left side of the rear end of the protective cover, a pair of static contact pin positioning flange insertion grooves which correspond to each other are formed in the cavity bottom wall of the static contact pin insertion flange cavity, the pair of static contact pin positioning flange insertion grooves penetrate through the cavity bottom wall of the static contact pin insertion flange cavity and are communicated with the outside, the insertion spring positioning cavity corresponds to the right side of the static contact pin insertion flange cavity and is provided with an insertion spring positioning insertion pin slot on the cavity bottom wall of the insertion spring positioning cavity, and the insertion spring positioning insertion pin penetrates through the cavity bottom wall of the insertion spring positioning slot and is communicated with the outside, the spring pin supporting cavity is formed at the edge part of the right side of the rear end 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 central position of one side of the protective cover facing upwards, the electric connecting piece positioning cavity is positioned at the front end 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 in the cavity bottom wall of the electric connecting piece positioning cavity, the base part of the inserted spring is positioned in the spring positioning cavity and is bent at the base part of the inserted spring to form a spring positioning embedded foot, the spring positioning embedded foot is embedded and fixed with the spring positioning embedded foot inserting groove, the side of the inserted spring facing the spring pin supporting cavity extends to form a spring pin for being connected with an electric circuit in series, and the spring pin is tightly attached to and supported on the spring pin supporting cavity and extends out of the right side surface of the protective cover, a heating wire insertion spring electrical connection lug extends on the front side of the base part of the insertion spring, the heating wire insertion spring electrical connection lug extends into the heating wire cavity, the heating wire is embedded in the heating wire cavity in a C-shaped state, a heating wire first connection end I of the heating wire is connected with the heating wire insertion spring electrical connection lug, a heating wire second connection end II of the heating wire is connected with an electrical connector, a bimetallic strip covers the heating wire, the electrical connector is arranged in the electrical connector positioning cavity, an electrical connector limiting strip extends from the right end of the electrical connector, the heating wire second connection end II is connected with the electrical connector limiting strip, an electrical connector positioning embedded foot extends on the electrical connector limiting strip and at a position corresponding to the electrical connector positioning embedded foot groove, and the electrical connector positioning embedded foot is embedded with the electrical connector positioning embedded foot groove, 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 are inserted and embedded in 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 in the static contact pin, 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 electrical connection end, the middle part of the movable contact piece is in contact with one side, facing the bimetallic strip, of the movable contact piece, one end of the movable contact piece, facing the static contact piece, forms a free end, a movable contact is welded and fixed at the position corresponding to the static contact, the protective contact pin is embedded in the protective cover, a protective contact pin electrical connector is extended from the protective contact pin, and the protective contact pin electrical connector is also in embedded and matched with the protective cover, the tail end of the protector pin electric connecting piece is folded and unfolded to form a protector pin electric connecting piece electric connecting lug, the protector pin electric connecting piece electric connecting lug is electrically connected with the static contact pin electric connecting end, the protective cover is covered on one side, corresponding to the upward direction of the protective cover, of the protective cover and fixed with the protective cover, the movable contact piece is a stainless steel piece, and one end, facing the electric connecting piece, of the movable contact piece is directly fixed with the opposite side of the electric connecting piece.

In a specific embodiment of the present invention, a pair of housing cover pressing claws extend upward at a left side edge portion of the shroud cover, and in a use state, the pair of housing cover pressing claws are in contact with an outer wall of a protector insertion seat for inserting and embedding an overheat protector of a motor of a refrigeration compressor, and a protector pin insertion cavity is further formed in the shroud cover at a position between the pair of housing cover pressing claws, and the protector pin is inserted in the protector pin insertion cavity and is electrically connected with a three-wire column of the compressor in a plug-in and pull-out manner in the use state.

In another specific embodiment of the present invention, a plug spring auxiliary leg connection plate extends on the plug spring at a position corresponding to the heating wire plug spring electrical connection lug, and a plug spring auxiliary leg extends on a right side of a middle portion in a length direction of the plug spring auxiliary leg connection plate, the plug spring auxiliary leg being supported on a plug spring auxiliary leg support portion formed on a right side of the shield and extending to a right side of the plug spring auxiliary leg support portion.

In a further embodiment of the invention, a socket spring auxiliary foot abdication chamber is formed on the right side of the shroud cover and at a position corresponding to the socket spring auxiliary foot.

In a further specific embodiment of the present invention, one end of the movable contact piece facing the electrical connector is directly welded and fixed to an opposite side of the electrical connector.

In still another specific embodiment of the present invention, a protector electrical terminal defining cavity having the same shape as the protector pin electrical terminal and communicating with the protector pin insertion cavity is formed at a position corresponding to the protector pin electrical terminal on the side of the shield cover facing upward, a stationary contact pin electrical connection terminal passing hole is formed in the protector electrical terminal defining cavity and at a position corresponding to the stationary contact pin electrical connection terminal of the stationary contact pin, the protector pin electrical terminal is inserted in the protector electrical terminal defining cavity and the protector pin electrical terminal electrical connection lug corresponds to the front side of the stationary contact pin electrical connection terminal passing hole.

In a more specific embodiment of the present invention, the stationary contact pin electrical connection end of the stationary contact pin passes upwardly through the cover cap at a position corresponding to the stationary contact pin electrical connection end passage hole for the protector pin electrical connection tab to be electrically connected thereto by soldering.

In a further specific embodiment of the present invention, a moving contact piece flange is formed at a side of the moving contact piece facing downward at a middle portion in a length direction thereof and at a center position corresponding to the bimetal, and the moving contact piece flange is brought into contact with a center position of the side of the bimetal facing upward.

In a still more specific embodiment of the present invention, a pair of shroud cover insertion fixing columns are formed at a lower portion of a right side of the shroud cover, a pair of fixing column insertion holes penetrating the shroud cover are formed at positions corresponding to the pair of shroud cover insertion fixing columns on the shroud cover, the pair of shroud cover insertion fixing columns and the pair of fixing column insertion holes are inserted and fixed, and a lower side surface of the shroud cover is formed as a shroud arc surface.

In yet another embodiment of the present invention, the pair of fixing post inserting holes are formed in a diagonally distributed positional relationship with each other on the shield, and the pair of shield cover inserting fixing posts are formed in a diagonally distributed positional relationship with each other on the shield cover.

The technical scheme provided by the invention has the technical effects that: because one end of the movable contact spring of the stainless steel sheet facing the electric connecting piece is directly fixed with the opposite side of the electric connecting piece, compared with the prior art, the movable contact spring is beneficial to abandoning a transition connecting piece, thereby not only reducing the number of parts, but also improving the processing efficiency and reasonably reducing the product cost; the stainless steel sheet has a large expansion coefficient, so that the stainless steel sheet is easy to deform relative to the copper sheet, and the thermal deformation speed is high under heating, so that the effect of assisting in accelerating the speed of breaking a circuit by disconnecting a movable contact on the stainless steel sheet and a fixed contact fixed on a fixed contact pin can be achieved.

Drawings

FIG. 1 is a block diagram of an embodiment of the present invention.

Fig. 2 is a schematic view illustrating an application of the present invention.

Description of the preferred embodiment

In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, 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 exemplified by the position state of fig. 1, and thus, it should not be understood as a particular limitation to the technical solution provided by the present invention.

Referring to fig. 1, there are shown a shield 1, a shield cover 2, a plug spring 3, a heating wire 4a, a bimetal 4b, an electric connector 5, a stationary contact pin 7, a movable contact 8 and a protector pin 9, a stationary contact pin insertion flange cavity 11, a plug spring positioning cavity 12, a plug spring pin supporting cavity 13, an electric wire cavity 14 and an electric connector positioning cavity 15 are formed at an upward side of the shield 1, the stationary contact pin insertion flange cavity 11 is located at a left side of a rear end of the shield 1 and a pair of stationary contact pin positioning flange insertion grooves 111 corresponding to each other are formed on a cavity bottom wall of the stationary contact pin insertion flange cavity 11, the pair of stationary contact pin positioning flange insertion grooves 111 is communicated with the outside through the cavity bottom wall of the stationary contact pin insertion flange cavity 11, the plug spring positioning cavity 12 corresponds to a right side (i.e., a right side) of the stationary contact pin insertion flange cavity 11 and a plug spring positioning insertion groove 121 is formed on a cavity bottom wall of the plug spring positioning cavity 12, the inserting spring positioning inserting foot slot 121 penetrates through the cavity bottom wall of the inserting spring positioning cavity 12 to be communicated with the outside, the inserting spring foot supporting cavity 13 is formed at the edge part at the right side of the rear end of the protective cover 1 at the position corresponding to the inserting spring positioning cavity 12 and is communicated with the inserting spring positioning cavity 12, the electric heating wire cavity 14 is formed at the central position of one side of the protective cover 1 facing upwards, the electric connecting piece positioning cavity 15 is positioned at the front end of the protective cover 1, an electric connecting piece positioning inserting foot slot 151 penetrating through the cavity bottom wall of the electric connecting piece positioning cavity 15 is formed in the cavity bottom wall of the electric connecting piece positioning cavity 15, the base part of the inserting spring 3 is positioned in the inserting spring positioning cavity 12 and is bent at the base part of the inserting spring 3 to form an inserting spring positioning inserting foot 31, the inserting spring positioning inserting foot 31 is inserted and fixed with the inserting spring positioning inserting foot slot 121, and an inserting foot 32 for being connected with an electric circuit (also called as an electric circuit) in series extends from one side of the inserting spring 3 facing the inserting spring positioning inserting foot supporting cavity 13 A heating wire insertion spring electrical connection lug 33 is extended from the front side surface (i.e., the left end front side surface) of the base portion of the insertion spring 3, the heating wire insertion spring electrical connection lug 33 is extended into the heating wire chamber 14, the heating wire 4a is embedded in the heating wire chamber 14 in a C-shaped state, a heating wire first connection end i 41 of the heating wire 4a is connected to the heating wire insertion spring electrical connection lug 33, a heating wire second connection end ii 42 of the heating wire 4a is connected to the electrical connector 5 by welding, preferably, a heating wire limiting boss 141 is formed at the center position of the heating wire chamber 14, the bimetal piece 4b is covered on the heating wire 4a, i.e., on the side of the heating wire 4a facing upward, the electrical connector 5 is provided in the electrical connector positioning chamber 15, an electric connector limiting strip 51 extends from the right end of the electric connector 5, the second connecting end II 42 of the heating wire is connected with the electric connector limiting strip 51 in a welding manner, an electric connector positioning embedded pin 511 extends from the electric connector limiting strip 51 at a position corresponding to the electric connector positioning embedded pin groove 151, the electric connector positioning embedded pin 511 is embedded and matched with the electric connector positioning embedded pin groove 151, the static contact pin 7 is arranged in the static contact pin inserting and embedding flange cavity 11, a pair of static contact pin inserting and embedding flanges 71 is formed on the static contact pin 7 at a position corresponding to the pair of static contact pin positioning flange inserting and embedding grooves 111, the pair of static contact pin inserting and embedding flanges 71 is inserted and fixed with the pair of static contact pin positioning flange inserting and embedding grooves 111, a static contact 72 is fixed on the static contact pin 7, one end of the static contact pin 7 facing to the protective cover 2 is penetrated through the protective cover 2 to form a static contact pin electric connecting end 73, the middle part of the movable contact piece 8 is contacted with the upward side of the bimetallic strip 4b, one end of the movable contact piece 8 facing the static contact 72 is formed as a free end, a movable contact 81 is welded and fixed at the position corresponding to the static contact 72, the protector pin 9 is embedded on the protective cover 2, the protector pin 9 extends to form a protector pin electric connecting piece 91, the protector pin electric connecting piece 91 is also embedded and matched with the protective cover 2, the tail end of the protector pin electric connecting piece 91 is folded and unfolded to form a protector pin electric connecting piece electric connecting lug 911, the protector pin electric connecting piece electric connecting lug 911 is electrically connected with the static contact pin electric connecting end 73, and the protective cover 2 is fixed with the protective cover 1 at the position corresponding to the upward side of the protective cover 1.

The technical key points of the technical scheme provided by the invention are as follows: the aforementioned movable contact piece 8 is a stainless steel piece and the downward side of the movable contact piece 8 toward the one end of the aforementioned electric connection member 5 is directly fixed with the upward side of the electric connection member 5, so that the side of the movable contact piece 8 toward the electric connection member 5, which is served by the stainless steel piece, is fixed with the opposite side of the electric connection member 5.

The applicant overcomes the design bias in the prior art through a lasting test, and changes the movable contact piece 8 from a stainless steel piece made of stainless steel instead of copper, so that the defects in the prior art are overcome in a real-time manner, and the technical effects recorded in the technical effect column of the applicant are brought back.

A pair of housing cover pressing claws 21 extend upward at the left edge of the shroud cover 2, the pair of housing cover pressing claws 21 are in contact with the outer wall of a protector insertion seat for inserting and embedding an overheat protector of the refrigeration compressor in a use state, a protector pin insertion cavity 22 is formed in the shroud cover 2 at a position between the pair of housing cover pressing claws 21, and the protector pin 9 is inserted into the protector pin insertion cavity 22 and is electrically connected to the compressor three-wire column in a plug-in and pull-out manner in the use state.

Continuing to refer to fig. 1, a plug spring auxiliary leg connecting plate 34 which facilitates easy electrical connection and has a function of selection as needed with respect to the plug spring leg 32 extends on the plug spring 3 at a position corresponding to the heating wire plug spring electrical connection lug 33, a plug spring auxiliary leg 341 extends on the right side of the middle portion in the longitudinal direction of the plug spring auxiliary leg connecting plate 34, and the plug spring auxiliary leg 341 is supported on a plug spring auxiliary leg supporting portion 17 formed on the right side of the shield 1 and extends to the right side of the shield 1.

A socket spring auxiliary leg relief chamber 23 is formed at the right side of the aforementioned shroud cover 2 and at a position corresponding to the socket spring auxiliary leg 341.

One end of the movable contact piece 8 facing the electric connector 5 is directly welded and fixed with the opposite side of the electric connector 5.

Continuing to refer to fig. 1, a protector pin electrical connector defining cavity 25 having the same shape as the protector pin electrical connector 91 and communicating with the protector pin insertion cavity 22 is formed on the left side of the protector cover cap 2 at a position corresponding to the protector pin electrical connector 91, a stationary contact pin electrical connector passing hole 251 is formed in the protector pin electrical connector defining cavity 25 at a position corresponding to the stationary contact pin electrical connector 73, the protector pin electrical connector 91 is inserted in the protector pin electrical connector defining cavity 25 and the protector pin electrical connector electrical connecting lug 911 corresponds to the front side of the stationary contact pin electrical connector passing hole 251.

The stationary contact pin electrical connection terminal 73 of the stationary contact pin 7 passes upwardly through the shroud cover 2 at a position corresponding to the stationary contact pin electrical connection terminal passing hole 251 for the protector pin electrical connection pad electrical connection lug 911 to be electrically connected thereto by soldering.

Preferably, a moving contact flange 82 is formed at a side of the middle portion of the moving contact 8 facing downward and at a central position corresponding to the bimetal 4b, and the moving contact flange 82 is in contact with a central position of a side of the bimetal 4b facing upward.

A pair of shroud cover insertion/fitting fixing posts 24 are formed at the lower right side of the shroud cover 2, a pair of fixing post insertion/fitting holes 16 penetrating the shroud cover 1 are formed in the shroud cover 1 at positions corresponding to the pair of shroud cover insertion/fitting fixing posts 24, and the pair of shroud cover insertion/fitting fixing posts 24 are inserted and fitted and fixed in the pair of fixing post insertion/fitting holes 16. Preferably, the lower surface of the shield 1 is formed as a shield arcuate surface (schematically shown in fig. 2) that matches the cavity wall of the protector insertion cavity of the protector insertion seat 6 shown in fig. 2.

In the present embodiment, the pair of fixing post inserting and fitting holes 16 are formed in a diagonally distributed positional relationship with each other on the shroud 1, and the pair of shroud cover inserting and fitting fixing posts 24 are formed in a diagonally distributed positional relationship with each other on the shroud cover 2.

Preferably, after the pair of shield cover insertion fixing posts 24 are completely inserted into the pair of fixing post insertion holes 16 and slightly protrude out of the right side surface of the shield 1, the ends of the pair of shield cover insertion fixing posts 24 are melted by heating and form an expanded edge after cooling, so that the shield 1 and the shield cover 2 are sufficiently secured to each other.

Since the operating principle of the overheat protector for the motor of the refrigeration compressor belongs to the known technology, for example, refer to the patent documents mentioned in the above background art column by the applicant, and only briefly described below, since it is connected in series in the electric circuit, that is, the electric line, when the bimetal 4b is heated and deformed by the heating wire 4a, an upward force is generated on the movable contact 8, so that the movable contact 81 is separated from the stationary contact 72, the circuit, that is, the circuit is disconnected, and the protection function for the motor of the refrigeration compressor is performed. On the contrary, when the heating wire 4a or the heat radiation of the external environment is at a temperature lower than the temperature at which the bimetal 4b is sensed and deformed, the bimetal 4b is reset, the moving and stationary contacts 81 and 72 are closed (electrically contacted with each other), and the motor circuit of the refrigeration compressor is turned on again.

Referring to fig. 2, a starter 10 and a protector insert 6 already mentioned above are shown in fig. 2, the starter 10 is provided with a starter, and a starter housing of the starter 10 is integrally formed with the protector insert 6 (i.e., the protector housing), so that the structure shown in fig. 2 is represented as a motor start overload protector (conventionally referred to simply as "motor start protector") of a refrigeration compressor. The applicant needs to state that: the shape shown in figure 2 is not limiting and other housing shapes such as CN215187850U and any of the applicant's mentioned in the background section above that can bring together the starter and the protector may be used, for example.

In conclusion, the technical scheme provided by the invention overcomes the defects in the prior art, successfully completes the invention task and truly realizes the technical effects of the applicant in the technical effect column.

Claims (10)

1. A refrigeration compressor motor overheating protector comprises a protective cover (1), a protective cover (2), an insert spring (3), an electric heating wire (4 a), a bimetallic strip (4 b), an electric connecting piece (5), a static contact pin (7), a movable contact piece (8) and a protector pin (9), wherein a static contact pin inserting flange cavity (11), an insert spring positioning cavity (12), an insert spring pin supporting cavity (13), an electric heating wire cavity (14) and an electric connecting piece positioning cavity (15) are formed in one upward side of the protective cover (1), the static contact pin inserting flange cavity (11) is positioned on the left side of the rear end of the protective cover (1), a pair of static contact pin positioning flange inserting grooves (111) are formed in the bottom wall of the static contact pin inserting flange cavity (11) and communicated with the outside, the insert spring positioning cavity (12) penetrates through the bottom wall of the static contact pin inserting flange cavity (11) and is communicated with the outside, the insert spring positioning cavity (121) is positioned on the right side of the static contact pin inserting flange cavity (11), the insert spring positioning groove (111) penetrates through the bottom wall of the insert spring inserting flange cavity (12) and is positioned at the insert groove (121) corresponding to the insert groove (12) of the insert spring, and is positioned on the insert spring inserting groove (12) and is positioned on the bottom wall of the insert spring inserting groove (121) corresponding to the insert pin inserting groove (12) of the insert spring positioning groove (12), the electric heating wire cavity (14) is formed in the center of one upward side of the shield (1), the electric connecting piece positioning cavity (15) is positioned at the front end of the shield (1), an electric connecting piece positioning embedded foot groove (151) penetrating through the cavity bottom wall of the electric connecting piece positioning cavity (15) is formed in the cavity bottom wall of the electric connecting piece positioning cavity (15), the base part of the inserted spring (3) is positioned in the inserted spring positioning cavity (12) and is bent at the base part of the inserted spring (3) to form an inserted spring positioning embedded foot (31), the inserted spring positioning embedded foot (31) is fixedly inserted into the inserted spring positioning embedded foot groove (121), an inserted spring (32) used for being connected with an electric circuit in series extends from one side of the inserted spring (3) facing the inserted spring foot supporting cavity (13), the plug spring foot (32) is closely attached to and supported on the plug spring foot supporting cavity (13) and extends out of the right side surface of the protective cover (1), a heating wire plug spring electric connecting lug (33) extends from the front side surface of the base part of the plug spring (3), the heating wire plug spring electric connecting lug (33) extends into the heating wire cavity (14), the heating wire (4 a) is embedded in the heating wire cavity (14) in a C-shaped state, a first heating wire connecting end I (41) of the heating wire (4 a) is connected with the heating wire plug spring electric connecting lug (33), and a second heating wire connecting end II (42) of the heating wire (4 a) is connected with the electric connecting piece (5) A bimetal (4 b) is covered on the electric heating wire (4 a), an electric connector (5) is arranged in the electric connector positioning cavity (15), the right end of the electric connector (5) extends to form an electric connector limiting strip (51), the second connecting end II (42) of the electric heating wire is connected with the electric connector limiting strip (51), a positioning embedded pin (511) extends on the electric connector limiting strip (51) and at a position corresponding to the electric connector positioning embedded pin groove (151), the electric connector positioning embedded pin (511) is embedded and matched with the electric connector positioning embedded pin groove (151), a static contact pin (7) is arranged in the static contact pin embedded flange cavity (11), a pair of static contact pin embedded flanges (71) is formed on the static contact pin (7) and at a position corresponding to the pair of static contact pin positioning embedded grooves (111), the pair of static contact pin embedded flanges (71) is inserted and fixed with the pair of static contact pin positioning embedded grooves (111), a static contact pin embedded flange (7) is formed on the static contact pin embedded and fixed with the static contact pin (7), one end (7) is covered by a cover (8), one side of the static contact pin (7) is formed to cover the static contact pin (8), and one side of the static contact pin (7) is covered by the static contact pin (72) and one side of the static contact pin (7) which is covered by the static contact pin (7) and covers the static contact pin (8) and covers the static contact pin (72), and one side of the static contact pin (7) which is formed to cover (8) which is covered by the static contact pin (8) and covers the static contact pin (7), and one side of the static contact pin (7) which is covered by the static contact pin (7) and covers the static contact pin (8) and covers the static contact pin (7) which is covered by the static contact pin (7), and the static contact pin (7) which is covered by the static contact pin (8) and the static contact pin (7) and covers the static contact pin (8) and covers the static contact pin (7), and the static contact pin (7) which is covered by the static contact pin (7) and covers the static contact pin (8) and the static contact pin (7) and covers one side of the static contact pin (8) and covers the static contact pin (7) which is covered by the static contact pin (8) which The protector pin electric connecting piece (91) is also matched with the shield cover (2), the tail end of the protector pin electric connecting piece (91) is folded and unfolded to form a protector pin electric connecting piece electric connecting lug (911), the protector pin electric connecting lug (911) is electrically connected with the fixed contact pin electric connecting end (73), and the shield cover (2) is fixed with the shield (1) at a position corresponding to one side of the shield (1) facing upwards, and the movable contact piece (8) is a stainless steel piece and one end of the movable contact piece (8) facing the electric connecting piece (5) is directly fixed with one side of the electric connecting piece (5) facing upwards.

2. The overheat protector for the motor of the refrigerating compressor according to claim 1, wherein a pair of cover pressing claws (21) are extended upward at a left side edge portion of the shroud cover (2), the pair of cover pressing claws (21) contact with an outer wall of a protector insertion seat for inserting the overheat protector for the motor of the refrigerating compressor in a use state, a protector pin insertion cavity (22) is further formed at a position on the shroud cover (2) and between the pair of cover pressing claws (21), and the protector pin (9) is inserted into the protector pin insertion cavity (22) and electrically connected to the compressor three-leg in a plug-in manner in the use state.

3. The overheat protector for the motor of the refrigerating compressor according to claim 1, wherein a plug spring auxiliary leg connecting plate (34) is extended at a position corresponding to the heating wire plug spring electric connecting lug (33) on the plug spring (3), a plug spring auxiliary leg (341) is extended at a right side of a middle portion in a length direction of the plug spring auxiliary leg connecting plate (34), and the plug spring auxiliary leg (341) is supported on a plug spring auxiliary leg supporting portion (17) formed at a right side of the shield (1) and extended to a right side of the plug spring auxiliary leg supporting portion (17).

4. The overheat protector for the motor of the refrigerating compressor according to claim 3, wherein a socket spring auxiliary leg relief chamber (23) is formed at the right side of the shroud cover (2) and at a position corresponding to the socket spring auxiliary leg (341).

5. The overheat protector for the motor of a refrigerating compressor according to claim 1 wherein the end of the moving contact piece (8) facing the electrical connector (5) is directly welded and fixed to the side of the electrical connector (5) facing the side.

6. The overheat protector for the motor of the refrigerating compressor according to claim 1, wherein a protector electrical lug defining cavity (25) having the same shape as the protector pin electrical lug (91) and communicating with the protector pin insertion cavity (22) is formed at a position corresponding to the protector pin electrical lug (91) on an upward-facing side of the protector cover cap (2), a stationary contact pin electrical connection terminal passing hole (251) is formed in the protector electrical lug defining cavity (25) and at a position corresponding to the stationary contact pin electrical connection terminal (73) of the stationary contact pin (7), the protector pin electrical lug (91) is inserted in the protector electrical connection terminal defining cavity (25) and the protector pin electrical lug (911) corresponds to a front side of the stationary contact pin electrical connection terminal passing hole (251).

7. The overheat protector for the motor of the refrigerating compressor according to claim 6, wherein the stationary contact pin electrical connection terminal (73) of the stationary contact pin (7) is passed upwardly through the shroud cover (2) at a position corresponding to the stationary contact pin electrical connection terminal passing hole (251) for the protector pin electrical connection piece electrical connection lug (911) to be electrically connected thereto by welding.

8. A protector against overheat of a motor of a refrigerating compressor according to claim 1, wherein a moving contact flange (82) is formed at a side of a length direction middle portion of the moving contact (8) facing downward and at a center position corresponding to the bimetal (4 b), the moving contact flange (82) being in contact with a center position of a side of the bimetal (4 b) facing upward.

9. The overheat protector for the motor of the refrigeration compressor according to claim 1, wherein a pair of shroud cover insertion fixing posts (24) are formed at a lower portion of a right side of the shroud cover (2), a pair of fixing post insertion holes (16) penetrating the shroud cover (1) are formed at positions corresponding to the pair of shroud cover insertion fixing posts (24) on the shroud cover (1), the pair of shroud cover insertion fixing posts (24) and the pair of fixing post insertion holes (16) are inserted and fixed, and a lower side surface of the shroud cover (1) is formed as a shroud arc surface.

10. The overheat protector for the motor of the refrigerating compressor according to claim 9, wherein the pair of fixing post insertion holes (16) are formed in a diagonally distributed positional relationship with each other on the shroud (1), and the pair of shroud cover insertion fixing posts (24) are formed in a diagonally distributed positional relationship with each other on the shroud cover (2).

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