Overheat protector for motor of refrigeration compressor

Abstract

A refrigeration compressor motor overheat protector comprises a base, a shield cover, a static contact seat, a resistor disc, a bimetallic strip, an electric connecting piece, a middle inserting piece, a movable contact piece and a protector pin, an electric connecting piece supporting seat is formed at the left end of one upward side of the base, and an electric connecting piece pin embedding cavity is formed in the right side of the electric connecting piece supporting seat. A static contact seat cavity is formed in the right end of one upward side of the base, a pair of static contact seat pin embedding holes are formed in the static contact seat cavity, and a resistor disc cavity is formed in the middle of one upward side of the base; the resistor disc is characterized in that a pair of resistor disc placing convex strips protruding out of the bottom wall of the resistor disc cavity is formed in the resistor disc cavity and located on the bottom wall of the resistor disc cavity, the resistor disc is horizontally placed on the pair of resistor disc placing convex strips, and the resistor disc is formed by bending a resistor disc flat strip in a concentric state and is provided with a plurality of hollow cavities. The device has the advantages that the deformation speed of the bimetallic strip is increased, a circuit in an overheating state is shortened and cut off, and the protection effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical protection components, and particularly relates to an overheat protector for a refrigeration compressor motor. Background Art

[0002] As is known to all, during the operation of a refrigeration compressor, it will inevitably overheat due to various reasons, such as insufficient or excessive refrigerant, dirty evaporator or condenser, blocked capillary or refrigerant circuit system, too low voltage or abnormal operating pressure of the compressor. Therefore, an overheat protector (commonly abbreviated as "thermal protector" in the industry) needs to be equipped on the refrigeration compressor motor to cut off the power supply when the temperature of the refrigeration compressor is too high, so as to avoid damage to the compressor due to continuous high temperature, that is, to play a protective role for the compressor. Of course, the overheat protector is also applied to thermostats, dryer motors, and so on. That is to say, although the above description is about the overheat protector for a refrigeration compressor motor in this application, it does not exclude the overheat protection of the aforementioned thermostats, dryer motors, etc.

[0003] The typical structure of an earlier overheat protector for a refrigeration compressor motor is, for example, the "compressor thermal protector" disclosed in CN2821846Y. The recommended resistance component is a spiral heating wire with a spiral spring effect. Installing the spiral heating wire in the heating wire installation cavity of the base cannot achieve the good matching effect with the heating wire installation cavity of the base expected by the industry. Because the spiral heating wire has a spiral spring effect and another arching situation occurs, and the contact effect with the bimetallic sheet covering its upper surface is relatively lacking. In addition, the heating wires in the protector structure system involved in the "integrated motor starting protector" provided in CN113489382A and the heating wires used in the "overheat protector for a refrigeration compressor motor" introduced in CN219203076U also have the aforementioned situation.

[0004] As an improvement to the deficiencies of the above-mentioned heating wire structure, i.e., the resistance, it is taught in paragraph 0029 of the specification of the "Improved Flat Overload and Overheat Protector" disclosed in CN211479937U that: "A receiving groove is provided in the base, and the key component that heats up under current stored in the receiving groove is not the heating wire, but the resistance chip. Compared with the spiral heating wire, the resistance chip is directly stamped and formed in one step, and the consistency among the resistance chips of the same batch is good." Similarly, the heating element of the heating element assembly of the "Electric Heating Protector" disclosed in CN216749730U adopts a flat resistance chip similar to that of CN211479937U. The resistance chips of these two patents can, to a certain extent, make up for the deficiencies of the aforementioned spiral heating wire. However, these two patents have basically the same shortcoming: According to the resistance calculation formula R = ρL / S, where R represents resistance, ρ represents resistivity, L represents the length of the conductor, and S represents the cross-sectional area of the conductor. Accordingly, when the length and material are determined, the smaller the cross-sectional area, that is, the thinner and narrower the resistance chip, the greater the resistance, that is, the resistance is proportional to the length of the wire and inversely proportional to the cross-sectional area of the resistance chip. It can be seen from this that although the resistance chip with a small cross-sectional area may have a lower heat dissipation efficiency than the resistance chip with a large cross-sectional area, under the same voltage, the former will actually generate more heat due to its larger resistance value. Based on the foregoing, it can be confirmed that since the resistance chip structures of the above two patents have a relatively slow heating speed and are insufficient to cause the bimetallic strip to respond quickly (the deformation of the bimetallic strip pushes the moving contact piece, causing the moving contact point of the moving contact piece to separate from the static contact point on the static contact seat) and until the circuit is quickly cut off when the motor overheats, because their structures are both a single and non-concentric resistance chip ring, there is still a need for reasonable improvement. The technical solution to be introduced below was generated under this background. Summary of the Invention

[0005] The task of the present invention is to provide a refrigeration compressor motor overheat protector that can significantly improve the heating speed of the resistance chip, enabling the bimetallic strip to respond quickly and cut off the circuit to protect the motor and avoid causing greater potential safety hazards.

[0006] The task of the present utility model is completed as follows. A motor overheat protector for a refrigeration compressor includes a base, a shield cover, a static contact seat, a resistance sheet, a bimetallic sheet, an electrical connector, a middle insert piece, a moving contact piece, and a protector pin. On the left end of the upper side of the base, there is formed an electrical connector support seat, and on the right side of the electrical connector support seat, there is formed an electrical connector insert foot cavity penetrating the bottom wall of the base. On the right end of the upper side of the base, there is formed a static contact seat cavity, and in the static contact seat cavity, there are formed a pair of static contact seat insert foot holes penetrating the bottom wall of the base. In the middle of the upper side of the base, there is formed a resistance sheet cavity. The lower side of the shield cover faces downward and is inserted and fixed to the upper side of the base facing upward. The static contact seat is arranged in the static contact seat cavity. On the lower side of the front end of the static contact seat facing downward, there are formed a pair of static contact seat insert feet, and the pair of static contact seat insert feet are fixedly embedded with the pair of static contact seat insert foot holes. On the upper side of the front end of the static contact seat, there is fixed a static contact, and on the right side of the rear end of the static contact seat, there extends upward a static contact seat electrical connection foot, and the static contact seat electrical connection foot passes upward through a shield cover electrical connection foot relief hole opened on the shield cover and is electrically connected to the protector pin, and the protector pin is embedded on the upper side of the shield cover facing upward. The resistance sheet is arranged in the resistance sheet cavity, and the resistance sheet is electrically connected to the electrical connector and the middle insert piece. The bimetallic sheet covers the upper side of the resistance sheet and is in contact with the resistance sheet. The electrical connector is arranged on the electrical connector support seat, and the electrical connector is formed with an electrical connector insert foot, and the electrical connector insert foot is fitted with the electrical connector insert foot cavity. The middle insert piece is inserted and fitted with a middle insert piece insertion cavity formed on the front side of the base in a horizontal state. The moving contact piece is located above the bimetallic sheet. The left end of the moving contact piece is electrically connected to the electrical connector, the middle part is in contact with the bimetallic sheet in a contact type, and the right end of the moving contact piece is formed as a free end and is fixed with a moving contact at a position corresponding to the static contact. It is characterized in that in the resistance sheet cavity and on the bottom wall of the resistance sheet cavity of the resistance sheet cavity, there are formed a pair of resistance sheet resting ridges protruding from the bottom wall of the resistance sheet cavity, the resistance sheet is horizontally placed on the pair of resistance sheet resting ridges, and the resistance sheet is formed by bending a resistance sheet flat strip concentrically into a structure having a plurality of hollow cavities.

[0007] In a specific embodiment of the present utility model, a first bending portion in the shape of an Ω is formed at the center of the resistor sheet by bending the flat strip of the resistor sheet. On the left and right sides of the first bending portion, a pair of second bending portions with the same size and in the shape of an S are symmetrically bent. The central region of the first bending portion constitutes a hollow cavity of the first bending portion, and the concentric space formed by the second bending portions constitutes a hollow cavity of the second bending portion. At the end of the second bending portion on the left side of the pair of second bending portions, an electrical connection plate for electrical connection with the electrical connector is extended and formed. At the end of the second bending portion on the right side, a middle insert electrical connection plate for electrical connection with the middle insert is extended and formed.

[0008] In another specific embodiment of the present utility model, a pair of fixing post insertion holes are formed in the base. The pair of fixing post insertion holes are in a diagonal relationship with each other. On the downward side of the shield cover and at positions corresponding to the pair of fixing post insertion holes, a pair of shield cover fixing posts are formed. The pair of shield cover fixing posts are inserted and matched with the pair of fixing post insertion holes.

[0009] In yet another specific embodiment of the present utility model, a pair of spaced-apart cover pressing claws extend upward at the rear edge portion of the shield cover. On the shield cover and at a position between the pair of cover pressing claws, a protector pin insertion cavity is also formed. The protector pin is inserted into the protector pin insertion cavity and is electrically connected to the three-wire terminal of the compressor in a pluggable manner in the use state. The protector pin extends with a protector pin electrical connection piece. At the end of the protector pin electrical connection piece, it is bent to form a protector pin electrical connection piece electrical connection ear. On the right side of the protector pin electrical connection piece electrical connection ear, an electrical connection flange is formed. The upper left side of the static contact seat electrical connection leg is electrically connected to the electrical connection flange. On the upward side of the shield cover and at a position corresponding to the protector pin electrical connection piece, a protector electrical connection piece defining cavity with the same shape as the protector pin electrical connection piece and communicating with the protector pin insertion cavity is formed. The protector pin electrical connection piece is inserted into the protector electrical connection piece defining cavity.

[0010] In still another specific embodiment of the present utility model, a middle insert insertion foot jack penetrating the bottom wall of the base is formed at the right end of the middle insert insertion cavity of the base. At the rear end of the middle insert and at a position corresponding to the middle insert insertion foot jack, each is bent to form a middle insert insertion foot. The middle insert insertion foot is inserted and matched with the middle insert insertion foot jack.

[0011] In still another specific embodiment of the present utility model, an electrical connection plate connection ear of the electrical connector is formed at the right front end of the electrical connector and at a position corresponding to the lower part of the electrical connection plate of the electrical connector. And an electrical connection plate connection ear of the middle insert piece is formed on the middle insert piece and at a position corresponding to the lower part of the electrical connection plate of the middle insert piece. The electrical connection plate of the electrical connector is fixedly welded to the electrical connection plate connection ear of the electrical connector, and the electrical connection plate of the middle insert piece is fixedly welded to the electrical connection plate connection ear of the middle insert piece.

[0012] In yet another specific embodiment of the present utility model, a contact piece fixing ear is formed at the left rear end of the electrical connector. A group of electrical connection positioning holes of the moving contact piece fixing ear are formed at intervals on the moving contact piece fixing ear. A moving contact piece electrical connection fixing plate extends from the left end of the moving contact piece. A group of positioning flanges protruding downward are formed at intervals on the moving contact piece electrical connection fixing plate. The positions of the group of positioning flanges of the moving contact piece electrical connection fixing plate are matched with the electrical connection positioning holes of the moving contact piece fixing ear and are fixedly welded to each other. On the lower side in the middle of the length direction of the moving contact piece and at a position corresponding to the center position of the bimetal piece, a moving contact piece flange is formed. The moving contact piece flange contacts the center position on the upper side of the bimetal piece.

[0013] In yet another specific embodiment of the present utility model, an auxiliary foot connecting rib plate extends leftward at the right rear end of the middle insert piece and at a position behind the electrical connection plate connection ear of the middle insert piece. An auxiliary foot extends forward in the middle of the length direction of the auxiliary foot connecting rib plate. A rib plate slot is formed at the front side of the base and at a position corresponding to the auxiliary foot connecting rib plate. The auxiliary foot connecting rib plate is fixedly inserted into the rib plate slot.

[0014] In yet another more specific embodiment of the present utility model, a protector pin electrical connection piece blocking and limiting strip in an L shape is formed on the upper side of the protective cover and at a position corresponding to the outside of the protector electrical connection piece limiting cavity. The protector pin electrical connection piece blocking and limiting strip blocks and limits the protector pin electrical connection piece arranged in the protector electrical connection piece limiting cavity.

[0015] In yet another further specific embodiment of the present utility model, the base and the protective cover are formed by plastic molding; the static contact seat, the resistance piece, the bimetal piece, the electrical connector, the middle insert piece, the moving contact piece and the protector pin are made of stainless steel.

[0016] The technical effect of the technical solution provided by the present utility model lies in that: since the resistor sheet is bent from a resistor sheet flat strip into a structure with a plurality of hollow cavities in a concentric state, it is possible to correspondingly extend the length of the resistor sheet flat strip by narrowing the cross-sectional area of the resistor sheet flat strip constituting the resistor sheet without expanding the resistor sheet cavity, so that the heating speed of the resistor sheet under the same voltage can be increased, and the deformation speed of the bimetallic sheet can be correspondingly increased, shortening the circuit for cutting off the overheating state, and can play an ultimate protective role in protecting the refrigeration compressor motor. Brief Description of the Drawings

[0017] Figure 1 It is a structural diagram of an embodiment of the present utility model. Detailed Embodiment

[0018] In order to more clearly understand the technical essence and beneficial effects of the present utility model, the applicant will make a detailed description in the following by way of examples. However, the description of the examples is not a limitation on the solution of the present utility model. Any equivalent transformation that is merely formal rather than substantial based on the concept of the present utility model should be regarded as falling within the scope of the technical solution of the present utility model.

[0019] In the following description, all concepts related to the directionality or orientation such as up, down, left, right, front and back are based on Figure 1 the current position state. Therefore, it cannot be understood as a special limitation on the technical solution provided by the present utility model.

[0020] Please refer to Figure 1, which shows a base 1, a shield cover 2, a static contact seat 3, a resistance sheet 4, a bimetal sheet 5, an electrical connector 6, a middle insert piece 7, a moving contact piece 8 and a protector pin 9. On the left end of the upper side of the base 1, there is formed an electrical connector support seat 11a, and on the right side of the electrical connector support seat 11a, there is formed an electrical connector insert foot cavity 11b penetrating the bottom wall of the base 1. On the right end of the upper side of the base 1, there is formed a static contact seat cavity 11c, and in the static contact seat cavity 11c, there are formed a pair of static contact seat insert foot holes 11d penetrating the bottom wall of the base 1. In the middle of the upper side of the base 1, there is formed a resistance sheet cavity 12. The lower side of the shield cover 2 is inserted and fixed to the upper side of the base 1. The static contact seat 3 is arranged in the aforementioned static contact seat cavity 11c. On the lower side of the front end of the static contact seat 3, there are formed a pair of static contact seat insert feet 31, and the pair of static contact seat insert feet 31 are fixedly embedded with the aforementioned pair of static contact seat insert foot holes 11d. On the upper side of the front end of the static contact seat 3, there is fixed a static contact 32, and on the right side of the rear end of the static contact seat 3, there extends upward a static contact seat electrical connection foot 33. The static contact seat electrical connection foot 33 passes upward through a shield cover electrical connection foot relief hole 21 formed in the shield cover 2 and is electrically connected to the aforementioned protector pin 9, and the protector pin 9 is embedded in the upper side of the shield cover 2. The resistance sheet 4 is arranged in the resistance sheet cavity 12, and the resistance sheet 4 is electrically connected to the aforementioned electrical connector 6 and the middle insert piece 7. The bimetal sheet 5 covers the upper side of the resistance sheet 4 and is in contact with the resistance sheet 4. The electrical connector 6 is arranged on the aforementioned electrical connector support seat 11a, and the electrical connector 6 is formed with an electrical connector insert foot 61, and the electrical connector insert foot 61 is fitted with the aforementioned electrical connector insert foot cavity 11b. The middle insert piece 7 is inserted horizontally into a middle insert piece insertion cavity 11e formed on the front side of the base 1. The moving contact piece 8 is located above the aforementioned bimetal sheet 5. The left end of the moving contact piece 8 is electrically connected (i.e., "electrically connected") to the aforementioned electrical connector 6, the middle part is in contact with the bimetal sheet 5 in a contact type, and the right end of the moving contact piece 8 is configured as a free end and is fixed with a moving contact 81 at a position corresponding to the aforementioned static contact 32.

[0021] As the technical key point of the technical solution provided by the present utility model: In the aforementioned resistance sheet cavity 12 and on the bottom wall of the resistance sheet cavity 12 of the resistance sheet cavity 12, there are formed a pair of resistance sheet resting ridges 121 protruding from the bottom wall of the resistance sheet cavity and having a D-shaped cross-sectional shape. The aforementioned resistance sheet 4 is horizontally rested on the pair of resistance sheet resting ridges 121, and the resistance sheet 4 is formed by bending a resistance sheet flat strip concentrically into a structure having a plurality of hollow cavities.

[0022] Please continue to see Figure 1, at the center of the aforementioned resistor sheet 4, a first bent portion 41 in the shape of an Ω is formed by bending the aforementioned flat strip of the resistor sheet. On the left and right sides of the first bent portion 41, a pair of second bent portions 42 of the same size and in the shape of an S are formed by subsequent bending in a symmetric state. The central region of the first bent portion 41 is configured as a first bent portion hollow cavity 411, and the concentric space formed by the second bent portions 42 is configured as a second bent portion hollow cavity 421. At the end of the left second bent portion among the pair of second bent portions 42, an electrical connector electrical connection plate 43 for electrically connecting to the aforementioned electrical connector 6 is extended and formed, and at the end of the right second bent portion, a middle insert electrical connection plate 44 for electrically connecting to the aforementioned middle insert 7 is extended and formed.

[0023] The structure of the aforementioned resistor sheet 4 can truthfully make up for the deficiencies described by the applicant in the background art column above, and can objectively achieve the technical effects described by the applicant in the technical effects column above.

[0024] A pair of fixing post insertion holes 13a are formed on the aforementioned base 1, and the pair of fixing post insertion holes 13a are in a diagonal relationship with each other. In return, a pair of shroud cover fixing posts 22 are formed on the downward side of the aforementioned shroud cover 2 and at positions corresponding to the pair of fixing post insertion holes 13a, and the pair of shroud cover fixing posts 22 are inserted and matched with the pair of fixing post insertion holes 13a.

[0025] On the rear side edge portion of the aforementioned shroud cover 2, a pair of spaced-apart cover pressing claws 23 extend upward. The cover pressing claws 23 are in contact with the outer wall of the protector insertion seat for inserting a refrigeration compressor motor overheat protector in the use state. On the shroud cover 2 and at a position between the pair of cover pressing claws 23, a protector pin insertion cavity 24 is also formed. The aforementioned protector pin 9 is inserted into the protector pin insertion cavity 24 and is electrically connected to the compressor three-wire post in a pluggable manner in the use state. The protector pin 9 extends a protector pin electrical connection piece 91. At the end of the protector pin electrical connection piece 91, it is bent to form a protector pin electrical connection piece electrical connection ear 911. On the right side of the protector pin electrical connection piece electrical connection ear 911, an electrical connection flange 9111 is formed. The upper left side of the static contact seat electrical connection leg 33 is electrically connected to the electrical connection flange 9111. On the upward side of the aforementioned shroud cover 2 and at a position corresponding to the aforementioned protector pin electrical connection piece 91, a protector electrical connection piece limiting cavity 25 having the same shape as the protector pin electrical connection piece 91 and communicating with the aforementioned protector pin insertion cavity 24 is formed, and the protector pin electrical connection piece 91 is inserted into the protector electrical connection piece limiting cavity 25.

[0026] Please continue to see Figure 1, at the right end of the middle insert piece insertion cavity 11e of the base 1, there is formed a middle insert piece insertion foot jack 11f penetrating through the bottom wall of the base 1. At the rear end of the middle insert piece 7 and at positions corresponding to the middle insert piece insertion foot jack 11f, each is bent to form a middle insert piece insertion foot 71, and the middle insert piece insertion foot 71 is inserted and fitted with the middle insert piece insertion foot jack 11f.

[0027] At the front right end of the electrical connector 6 and at a position corresponding to the lower side of the electrical connector electrical connection plate 43, there is formed an electrical connector electrical connection plate electrical connection ear 62. On the middle insert piece 7 and at a position corresponding to the lower side of the middle insert piece electrical connection plate 44, there is formed a middle insert piece electrical connection plate electrical connection ear 72. The electrical connector electrical connection plate 43 is fixedly welded to the electrical connector electrical connection plate electrical connection ear 62, and the middle insert piece electrical connection plate 44 is fixedly welded to the middle insert piece electrical connection plate electrical connection ear 72.

[0028] As Figure 1 shown, at the left rear end of the electrical connector 6, there is formed a contact piece fixing ear 63. On the moving contact piece fixing ear 63, a group of moving contact piece fixing ear electrical connection positioning holes 631 are formed at intervals. At the left end of the moving contact piece 8, there extends a moving contact piece electrical connection fixing plate 82. On the moving contact piece electrical connection fixing plate 82, a group of downwardly protruding moving contact piece electrical connection fixing plate positioning flanges 821 are formed at intervals. The positions of the group of moving contact piece electrical connection fixing plate positioning flanges 821 are matched with the moving contact piece fixing ear electrical connection positioning holes 631 and are fixedly welded to each other. At the middle of the moving contact piece 8 in the length direction and on the downward side and at a position corresponding to the center position of the bimetal sheet 5, there is formed a spherical moving contact piece flange 83, and the moving contact piece flange 83 contacts the center position of the upward side of the bimetal sheet 5.

[0029] Preferably, at the right rear end of the middle insert piece 7 and at a position behind the middle insert piece electrical connection plate electrical connection ear 72, there extends a leftward auxiliary foot connecting rib plate 73. At the middle of the length direction of the auxiliary foot connecting rib plate 73, there extends forward an auxiliary foot 731. On the front side of the base 1 and at a position corresponding to the auxiliary foot connecting rib plate 73, there is provided a rib plate slot 14, and the auxiliary foot connecting rib plate 73 is inserted and fixed with the rib plate slot 14.

[0030] On the upward side of the protective cover 2 and at a position corresponding to the outside of the protector electrical connection piece limiting cavity 25, there is formed a protector pin electrical connection piece blocking and limiting strip 26 in an L shape and protruding from the upward side surface of the protective cover 2. The protector pin electrical connection piece 91 arranged in the protector electrical connection piece limiting cavity 25 is blocked and limited by the protector pin electrical connection piece blocking and limiting strip 26.

[0031] Preferably, the aforementioned base 1 and the shield cover 2 are made by plastic molding; the aforementioned static contact seat 3, resistance sheet 4, bimetal sheet 5, electrical connector 6, middle insertion piece 7, moving contact piece 8, and protector pin 9 are made of stainless steel. Preferably, the opposite surfaces of the aforementioned moving contact point 81 and the static contact point 32 are silver-plated.

[0032] Since the working principle of the refrigeration compressor motor overheat protector belongs to well-known technology, for example, reference can be made to the patent documents mentioned by the applicant in the background art column above and in the background art column of Chinese Patent No. ZL202320139344.5, so only a brief description will be given below. Since it is connected in series in the electrical circuit, that is, the electrical line, when an abnormal situation causing overheating mentioned in the background art column occurs, the resistance sheet 4 generates heat. When the bimetal sheet 5 is heated and deformed under the heating of the resistance sheet 4, an upward pushing force is generated on the moving contact piece 8, causing the moving contact point 81 to separate from the static contact point 32, disconnecting the circuit, that is, the loop, and playing a role in protecting the refrigeration compressor motor. Conversely, when the heat radiation of the resistance sheet 4 or the external environment is lower than the temperature at which the bimetal sheet 5 responds and deforms, the bimetal sheet 5 resets, and the moving and static contact points 81 and 82 close (electrically contact each other), and the motor circuit of the refrigeration compressor is reconnected.

[0033] In summary, due to the improvement of the structure of the resistance sheet 4, which is an important component, the technical solution provided by the present utility model makes up for the deficiencies in the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the technical effects column above.

Claims

1. A refrigeration compressor motor overheat protector, comprising a base (1), a protective cover (2), a static contact seat (3), a resistor (4), a bimetallic strip (5), an electrical connector (6), a middle insert (7), a movable contact (8) and a protector pin (9), wherein an electrical connector support seat (11a) is formed at the left end of the upper side of the base (1), and an electrical connector pin cavity (11b) penetrating the bottom wall of the base (1) is formed on the right side of the electrical connector support seat (11a), and a static contact seat cavity (11c) is formed at the right end of the upper side of the base (1), and a movable contact (8) is formed in the static contact seat cavity (11c). A pair of static contact seat pin holes (11d) penetrate the bottom wall of the base (1), a resistor sheet cavity (12) is formed in the middle of the side of the base (1) facing upward, the side of the protective cover (2) facing downward is inserted and fixed with the side of the base (1) facing upward, the static contact seat (3) is arranged in the static contact seat cavity (11c), the side of the static contact seat (3) facing downward is formed with a pair of static contact seat pins (31), the pair of static contact seat pins (31) are embedded with the pair of static contact seat pin holes (11d), a static contact (32) is fixed on the side of the static contact seat (3) facing upward, and the static contact seat (3) is provided with a static contact (32). ) has a static contact seat electrical connection pin (33) extending upward from the right side of the rear end thereof, the static contact seat electrical connection pin (33) passing upward through the shield cover electrical connection pin clearance hole (21) provided on the shield cover (2) to be electrically connected to the protector pin (9), and the protector pin (9) is embedded in the side of the shield cover (2) facing upward, the resistor (4) is arranged in the resistor cavity (12), and the resistor (4) is electrically connected to the electrical connector (6) and the middle insert (7), the bimetallic strip (5) covers the side of the resistor (4) facing upward and is in contact with the resistor (4), and the electrical connector (6) is arranged on the electrical connector support seat (11a), and the electrical connector (6) is formed with an electrical connector pin (61), the electrical connector pin (61) is inserted into the electrical connector pin cavity (11b), the middle insert (7) is inserted into the middle insert cavity (11e) formed on the front side of the base (1) in a horizontal state, the moving contact (8) is located above the bimetallic strip (5), the left end of the moving contact (8) is electrically connected to the electrical connector (6), the middle part is in contact with the bimetallic strip (5), and the right end of the moving contact (8) is formed as a free end and a moving contact (81) is fixed at a position corresponding to the static contact (32); it is characterized in that: A pair of resistor plate resting convex strips (121) protruding from the resistor plate cavity bottom wall are formed in the resistor plate cavity (12) and located on the resistor plate cavity bottom wall of the resistor plate cavity (12); the resistor plate (4) is rested on the pair of resistor plate resting convex strips (121) in a horizontal state; and the resistor plate (4) is formed by bending a resistor plate flat strip in a concentric state into a structure having a plurality of hollow cavities.

2. The refrigeration compressor motor overheat protector according to claim 1, characterized in that: At the center of the resistor (4), a first bend (41) in the shape of Ω is formed by bending the flat strip of the resistor. A pair of second bends (42) of the same size and in the shape of S are formed by bending symmetrically on the left and right sides of the first bend (41). The central area of ​​the first bend (41) is formed as a first bend hollow cavity (411), and the concentric space formed by the second bend (42) is formed as a second bend hollow cavity (421). The end of a second bend located on the left side of the pair of second bends (42) is expanded to form an electrical connector electrical connection board (43) for electrical connection with the electrical connector (6), and the end of a second bend located on the right side is expanded to form a middle plug electrical connection board (44) for electrical connection with the middle plug (7).

3. The refrigeration compressor motor overheat protector according to claim 1, characterized in that: A pair of fixing column insertion holes (13a) are provided on the base (1), the pair of fixing column insertion holes (13a) are in a diagonal relationship with each other, and a pair of shield cover fixing columns (22) are formed on the downward side of the shield cover (2) and at positions corresponding to the pair of fixing column insertion holes (13a), and the pair of shield cover fixing columns (22) are plugged into the pair of fixing column insertion holes (13a).

4. The refrigeration compressor motor overheat protector according to claim 1, characterized in that: A pair of cover holding claws (23) spaced apart from each other are extended upward from the rear edge of the protective cover (2), and a protector pin embedding cavity (24) is formed on the protective cover (2) and between the pair of cover holding claws (23). The protector pin (9) is embedded in the protector pin embedding cavity (24) and is electrically connected to the compressor three-wire pole in a plug-in manner when in use. The protector pin (9) extends a protector pin electrical connecting piece (91), and a protector pin electrical connecting piece electrical connecting ear (911) is formed by bending at the end of the protector pin electrical connecting piece (91). An electrical connection flange (9111) is formed on the right side of the electrical connection ear (911) of the protector pin electrical connection piece, and the upper left side of the static contact seat electrical connection pin (33) is electrically connected to the electrical connection flange (9111). A protector electrical connection piece limiting cavity (25) having the same shape as the protector pin electrical connection piece (91) and communicating with the protector pin embedding cavity (24) is formed on the upward side of the protective cover (2) and at a position corresponding to the protector pin electrical connection piece (91). The protector pin electrical connection piece (91) is embedded in the protector electrical connection piece limiting cavity (25).

5. The refrigeration compressor motor overheat protector according to claim 1, characterized in that: A middle insert pin insertion hole (11f) penetrating the bottom wall of the base (1) is formed at the right end of the middle insert inserting cavity (11e) of the base (1), and a middle insert pin (71) is formed by bending at the rear end of the middle insert (7) and at a position corresponding to the middle insert pin insertion hole (11f), and the middle insert pin (71) is inserted and matched with the middle insert pin insertion hole (11f).

6. The refrigeration compressor motor overheat protector according to claim 2, characterized in that: An electrical connector electrical connection board electrical connection ear (62) is formed on the right side of the front end of the electrical connector (6) and at a position corresponding to the lower side of the electrical connector electrical connection board (43), and a middle plug sheet electrical connection board electrical connection ear (72) is formed on the middle plug sheet (7) and at a position corresponding to the lower side of the middle plug sheet electrical connection board (44). The electrical connector electrical connection board (43) is welded to the electrical connector electrical connection board electrical connection ear (62), and the middle plug sheet electrical connection board (44) is welded to the middle plug sheet electrical connection board electrical connection ear (72).

7. The refrigeration compressor motor overheat protector according to claim 1, characterized in that: A contact piece fixing ear (63) is formed on the left side of the rear end of the electrical connector (6), and a group of moving contact piece fixing ear electrical connection positioning holes (631) are formed on the moving contact piece fixing ear (63) at intervals; a moving contact piece electrical connection fixing plate (82) extends from the left end of the moving contact piece (8), and a group of moving contact piece electrical connection fixing plate positioning flanges (821) protruding downward are formed on the moving contact piece electrical connection fixing plate (82) at intervals; the positions of the group of moving contact piece electrical connection fixing plate positioning flanges (821) match the moving contact piece fixing ear electrical connection positioning holes (631) and are welded and fixed to each other; a moving contact piece flange (83) is formed on the side facing downward in the middle of the longitudinal direction of the moving contact piece (8) and at the center position corresponding to the bimetallic strip (5), and the moving contact piece flange (83) is in contact with the center position of the upward side of the bimetallic strip (5).

8. The refrigeration compressor motor overheat protector according to claim 6, characterized in that: An auxiliary foot connection rib plate (73) is extended to the left at the right side of the rear end of the middle plug (7) and at a position behind the electrical connection ear (72) of the middle plug electrical connection plate. An auxiliary foot (731) extends forward from the middle of the length direction of the auxiliary foot connection rib plate (73). A rib plate slot (14) is provided at the front side of the base (1) and at a position corresponding to the auxiliary foot connection rib plate (73). The auxiliary foot connection rib plate (73) is inserted and fixed in the rib plate slot (14).

9. The refrigeration compressor motor overheat protector according to claim 4, characterized in that: A protector pin electrical connection piece blocking and limiting strip (26) having an L-shape and protruding from the surface of the upper side of the protective cover (2) is formed on the upper side of the protective cover (2) and at a position corresponding to the outer side of the protector electrical connection piece limiting cavity (25). The protector pin electrical connection piece blocking and limiting strip (26) blocks and limits the protector pin electrical connection piece (91) disposed in the protector electrical connection piece limiting cavity (25).

10. The refrigeration compressor motor overheat protector according to claim 1, characterized in that: The base (1) and the protective cover (2) are made of plastic molding; the static contact seat (3), the resistor sheet (4), the bimetallic sheet (5), the electrical connector (6), the middle plug sheet (7), the moving contact sheet (8) and the protector pin (9) are made of stainless steel.

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