Combined structure of overheat and overload protector
By designing a dual protection structure in the overheating and overload protector of the refrigeration compressor, including the motor start protector and fuse, the problem that existing protectors cannot be protected in time when facing high currents is solved, achieving higher safety and reliability.
Patent Information
- Application Number
- CN202421945271.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-13
AI Technical Summary
When faced with unexpected situations such as short circuits, the overheating and overload protectors of existing refrigeration compressors are prone to cause contact sticking and unable to disconnect, and the slow operation is difficult to protect quickly, resulting in failure of the refrigeration compressor and surrounding parts or even fire.
Design a combined structure of an overheating overload protector, including a motor start protector and an overcurrent protection element (such as a fuse) operating according to current conditions. Through a dual protection design, a fuse is connected in series between the motor start protector and the power supply to ensure that the fuse operates in time under high current conditions and disconnects the power supply.
It effectively avoids fire safety hazards caused by high current, improves the working reliability of the motor starter, and ensures the safety of the refrigeration compressor and surrounding components.
Smart Images
Figure CN222966718U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of starting protection devices for refrigeration compressor motors, and particularly relates to a combined structure of an overheat overload protector for a refrigeration compressor motor protector. Background Art
[0002] As is known in the industry, the most common abnormal conditions of a refrigeration compressor are overload and overheat caused by other problems such as overload or abnormal heat dissipation. Therefore, a refrigeration compressor requires an overheat overload protector to protect against such abnormal conditions to avoid greater harm caused by the occurrence of such abnormal conditions, such as overheating and burning out of the compressor motor, damage to surrounding components due to overheating of the outer shell, and even fire.
[0003] Currently, such overheat overload protectors in the industry are all realized by bimetal sheets, which is determined by the actual requirements of this application. A refrigeration compressor needs to be able to withstand a certain amount of short-term overload, and after the overload condition is alleviated or removed, the refrigeration compressor still needs to resume normal operation. The action characteristics of the bimetal sheet are the best choice to meet this requirement. The overheat overload protector realized by the bimetal sheet has two inherent characteristics: one is slow action, which is necessary for the short-term overload tolerance; the other is having contacts, which is necessary for the bimetal sheet to overheat and disconnect the circuit. These two inherent characteristics are the characteristics that a refrigeration compressor overheat overload protector must possess. However, in some specific accidental situations, they become difficult problems to solve. When the compressor suddenly and rapidly increases the current due to accidental situations such as short circuit, the accidental large current is extremely likely to cause the contacts to stick and unable to disconnect. In addition, due to the slow action characteristic of the protector, it is difficult to act quickly, which further increases the possibility of the contacts sticking. Therefore, while the overheat overload protectors on the market largely achieve the overheat overload abnormal protection of the refrigeration compressor, there are also occasional situations where the protector fails to provide effective protection, resulting in failures of the refrigeration compressor and surrounding components or even fire.
[0004] In view of the above existing technologies, the applicant has made a beneficial design, and the technical solution to be introduced below was generated under this background. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a combined structure of an overheat overload protector with dual protection, which can meet the large current working requirements of the compressor and make the protection of the refrigeration compressor motor safer.
[0006] The object of the present utility model is achieved in such a way that a combined structure of an overheat and overload protector includes a first protector, a second protector, and a base for carrying the first protector and the second protector. A first accommodation cavity for the first protector to be adaptively installed is formed on the base, and a second accommodation cavity for the second protector to be adaptively installed is formed side by side on one side of the first accommodation cavity. The first protector has a power supply pin and a load socket. The power supply pin is connected to one end of the second protector, and the other end of the second protector is connected to an external power supply. The first protector is a motor starting protector, and the second protector is an overcurrent protection element that operates according to current conditions.
[0007] In a specific embodiment of the present utility model, the rear end of the first accommodation cavity is open, and a relief opening is formed on the front cavity wall. A socket cavity is formed on the cavity wall of the first accommodation cavity. The power supply pin is arranged on the front end face of the first protector and protrudes forward through the relief opening. A fixed end is also arranged at the edge of the front end face. The load socket extends forward at the front end to form a connection end, and the load socket is embedded in the socket cavity, and its connection end is fixedly connected to the fixed end.
[0008] In another specific embodiment of the present utility model, the second protector is provided with a load connection terminal at the upper end and a power supply connection terminal at the lower end. The front end of the second accommodation cavity is open, and a load pin slot is formed at the upper end of the second accommodation cavity. The load connection terminal is inserted into the pin slot and is in electrical connection with the upper end of the second protector by being in contact with it. The front end of the load connection terminal extends outside the second accommodation cavity and is electrically connected to the power supply pin of the first protector. The power supply connection terminal includes a horizontal terminal and a vertical terminal arranged vertically. Grooves are formed in the opening of the second accommodation cavity corresponding to the horizontal terminal and the vertical terminal. The horizontal terminal extends rearward into the cavity to form an elastic contact piece, and the elastic contact piece is in electrical connection with the lower end of the second protector by being in contact with it. The vertical terminal extends forward to form a power supply connection end.
[0009] In yet another specific embodiment of the present utility model, a cover body is provided at the opening of the second accommodation cavity. The cover body is provided with buckles around it, and the outer wall of the second accommodation cavity is provided with card feet corresponding to the buckles for snap-fitting with the buckles.
[0010] In still another specific embodiment of the present utility model, load connection terminal holes and power supply connection end holes for the load connection terminal and the power supply connection end to pass through are respectively formed on the cover body at positions corresponding to the load connection terminal and the power supply connection end.
[0011] In still another specific embodiment of the present utility model, the load connection terminal of the second protector is electrically connected to the power supply pin of the first protector through a lead or a conductive sheet.
[0012] In yet another specific embodiment of the present utility model, the load socket of the first protector is used to connect to the combined lead-out end C of the main and auxiliary windings of the compressor motor.
[0013] In yet a further specific embodiment of the present utility model, the second protector is a fuse.
[0014] In an even further specific embodiment of the present utility model, the base is formed with a positioning plate at the bottom, and the positioning plate is formed with a winding terminal relief cavity at the bottom. When installed, the main winding lead-out end M and the auxiliary winding lead-out end S of the compressor motor pass through the winding terminal relief cavity and are adaptively installed with the winding terminal relief cavity.
[0015] In the present utility model, a fuse is connected in series between the motor starting protector and the power supply, adopting a double protection design. When a large current is generated due to a break (short circuit) in the coil of the refrigeration compressor, the fuse acts and can timely cut off the power supply to the coil, ensuring that the power supply timely disconnects the circuit, and the starting winding can be timely protected, thereby avoiding safety hazards such as fires and effectively improving the working reliability of the starter. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is an exploded view of the structure of the present utility model;
[0017] Figure 2 is Figure 1 a perspective view from the rear side;
[0018] Figure 3 is a schematic diagram of the electrical connection of an application example of the present utility model.
[0019] In the figure: 1. First protector, 11. Power supply pin, 12. Load socket, 121. Connection end, 13. Fixed end; 2. Second protector, 21. Load connection terminal, 22. Power supply connection terminal, 221. Horizontal terminal, 2211. Elastic contact piece, 222. Vertical terminal, 2221. Power supply connection terminal; 3. Base, 31. First accommodation cavity, 311. Relief opening, 312. Socket cavity, 32. Second accommodation cavity, 321. Load pin slot, 322. Groove, 323. Clamping foot, 33. Cover body, 331. Buckle, 332. Load connection terminal hole, 333. Power supply connection terminal hole, 34. Positioning plate, 341. Winding terminal relief cavity; 4. Compressor motor; 5. Motor starter. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The following is a detailed description of the specific embodiments of the present utility model in conjunction with the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any change in form rather than in essence based on the concept of the present utility model should be regarded as the protection scope of the present utility model.
[0021] In the following description, all concepts related to the directionality (or orientation) of up, down, left, right, front, and back are in reference to the position state of the figure being described, aiming to facilitate public understanding. Therefore, it cannot be understood as a special limitation on the technical solution provided by the present utility model.
[0022] Please refer to Figure 1 and Figure 2 , the present utility model relates to a combined structure of an overheat and overload protector for protecting a compressor and its accessories. The combined structure includes a first protector 1 and a second protector 2 connected in series, and a base 3 for carrying the first protector 1 and the second protector 2. A first receiving cavity 31 for fitting and installing the first protector 1 is formed on the base 3, and a second receiving cavity 32 for fitting and installing the second protector 2 is formed side by side on one side of the first receiving cavity 31. The first protector 1 has a power supply pin 11 and a load socket 12. The power supply pin 11 is connected to one end of the second protector 2, and the other end of the second protector 2 is connected to an external power supply.
[0023] Specifically, the rear end of the first receiving cavity 31 is open, and a relief opening 311 is formed on the front cavity wall. A socket cavity 312 is formed on the cavity wall of the first receiving cavity 31. The power supply pin 11 is disposed on the front end face of the first protector 1 and protrudes forward through the relief opening 311. A fixed end 13 is further disposed at the edge of the front end face. The load socket 12 extends at the front end to form a connection end 121. The load socket 12 is embedded in the socket cavity 312, and its connection end 121 is fixedly connected to the fixed end 13 by welding or the like.
[0024] The second protector 2 is provided with a load connection terminal 21 at the upper end and a power connection terminal 22 at the lower end. The front end of the second accommodation cavity 32 is open, and a load pin slot 321 is formed at the upper end of the second accommodation cavity 32. The load connection terminal 21 is inserted into the pin slot 321 and is in contact with the upper end of the second protector 2 to achieve electrical connection. The front end of the load connection terminal 21 extends outside the second accommodation cavity 32 and is electrically connected to the power pin 11 of the first protector 1. The power connection terminal 22 includes a horizontal terminal 221 and a vertical terminal 222 arranged vertically. The second accommodation cavity 32 is formed with grooves 322 corresponding to the horizontal terminal 221 and the vertical terminal 222 at the opening for fixing the power connection terminal 22. The horizontal terminal 221 extends towards the cavity at the rear side to form an elastic contact piece 2211, and the elastic contact piece 2211 is in contact with the lower end of the second protector 2 to achieve electrical connection; a power connection end 2221 extends forward from the vertical terminal 222.
[0025] Further, a cover 33 is provided at the opening of the second accommodation cavity 32. The cover 33 is provided with buckles 331 around it, and the outer wall of the second accommodation cavity 32 is provided with card feet 323 that are engaged with the buckles 331 corresponding to the buckles 331. The cover 33 is formed with a load connection terminal hole 332 and a power connection end hole 333 for the load connection terminal 21 and the power connection end 2221 to pass through at positions corresponding to the load connection terminal 21 and the power connection end 2221 respectively. The load connection terminal 21 of the second protector 2 and the power pin 11 of the first protector 1 are electrically connected by a lead or a conductive sheet.
[0026] The first protector 1 is a motor starting protector, and its load socket 12 is used for plugging in the winding lead-out end of the motor. The second protector 2 is an overcurrent protection element that operates according to current conditions. In this embodiment, the first protector 1 can be a bimetal protector, and the second protector 2 is a fuse.
[0027] See Figure 3 , which is a schematic diagram of the electrical connection of an application example of this embodiment. The compressor motor 4 has a main winding L1 and a secondary winding L2. An electric motor starter 5 is arranged outside the compressor motor. In this embodiment, the electric motor starter 5 is a heavy-duty starter. The main winding lead-out end M and the secondary winding lead-out end S of the compressor motor 4 are electrically connected to the electric motor starter 5. The combined structure of this embodiment is connected in series between the combined lead-out end C of the main and secondary windings of the compressor motor 4 and a connection terminal of an external AC power supply to form a current loop. The combined lead-out end C of the main and secondary windings of the compressor motor 4 is plugged into the load socket 12 of the first protector 1. The electric motor starter 5 is connected to one end of the starting capacitor Cs and the running capacitor CR, One end is electrically connected, the other end of the starting capacitor Cs is electrically connected to one end of the NTC thermistor, and the other end of the NTC thermistor is commonly connected to the coil of the motor starter 5 and the running capacitor C R, The other end is commonly connected to the other terminal of the external AC power supply.
[0028] The base 3 is formed with a positioning plate 34 at the bottom, and the positioning plate 34 is formed with a winding terminal relief cavity 341 at the bottom. During installation, the main winding lead-out end M and the auxiliary winding lead-out end S of the compressor motor 4 pass through the winding terminal relief cavity 341 and are adaptively installed with the winding terminal relief cavity 341.
[0029] When an abnormally large current appears in the series circuit of the first protector 1 and the second protector 2, the fuse effectively operates to cut off the power supply, ensuring that the power supply timely disconnects the circuit, so as to avoid accidents such as the compressor and its accessories failing and catching fire due to excessive current, and the fire spreading, resulting in a fire in the refrigeration cabinet. The working principle of the motor protector can be referred to the existing patent technology, so the applicant will not elaborate.
Claims
1. A combined structure of an overheat and overload protector, characterized in that: The invention comprises a first protector (1), a second protector (2) and a base (3) for carrying the first protector (1) and the second protector (2); the base (3) is formed with a first accommodating cavity (31) for the first protector (1) to be adapted and installed, and a second accommodating cavity (32) for the second protector (2) to be adapted and installed is formed in parallel on one side of the first accommodating cavity (31); the first protector (1) has a power pin (11) and a load socket (12); the power pin (11) is connected to one end of the second protector (2), and the other end of the second protector (2) is connected to an external power supply; the first protector (1) is a motor starter protector, and the second protector (2) is an overcurrent protection element that operates according to current conditions.
2. The combined structure of an overheat and overload protector according to claim 1, characterized in that: The first accommodating cavity (31) is open at the rear end, and a clearance opening (311) is formed on the cavity wall at the front end. The first accommodating cavity (31) is further formed with a socket cavity (312) on the cavity wall. The power pin (11) is arranged on the front end surface of the first protector (1) and protrudes forward through the clearance opening (311). A fixed end (13) is also arranged at the edge of the front end surface. The load socket (12) extends at the front end to form a connecting end (121). The load socket (12) is embedded in the socket cavity (312), and its connecting end (121) is fixedly connected to the fixed end (13).
3. The combined structure of an overheat and overload protector according to claim 2, characterized in that: The second protector (2) is provided with a load connection terminal (21) at the upper end and a power connection terminal (22) at the lower end. The front end of the second accommodating cavity (32) is open. The second accommodating cavity (32) forms a load pin slot (321) at the upper end. The load connection terminal (21) is inserted into the pin slot (321) and contacts the upper end of the second protector (2) to achieve electrical connection. The front end of the load connection terminal (21) extends outside the second accommodating cavity (32) to be electrically connected to the power pin (11) of the first protector (1). The power connection terminal (22) comprises a transverse terminal (221) and a vertical terminal (222) which are arranged vertically; the second accommodating cavity (32) is formed with a groove (322) at the opening corresponding to the transverse terminal (221) and the vertical terminal (222); the transverse terminal (221) extends toward the cavity at the rear side to form an elastic contact piece (2211); the elastic contact piece (2211) contacts the lower end of the second protector (2) to achieve electrical connection; and the vertical terminal (222) extends forward from the upper side to form a power connection terminal (2221).
4. The combined structure of the overheat and overload protector according to claim 3 is characterized in that: The second accommodating cavity (32) is provided with a cover body (33) at the opening, and the cover body (33) is provided with buckles (331) on the four sides. The second accommodating cavity (32) is provided with a clamping foot (323) corresponding to the buckle (331) on the outer wall thereof.
5. The combined structure of the overheat and overload protector according to claim 4 is characterized in that: A load connection terminal hole (332) and a power terminal hole (333) are respectively formed on the cover body (33) at positions corresponding to the load connection terminal (21) and the power terminal (2221), through which the load connection terminal (21) and the power terminal (2221) pass.
6. The combined structure of the overheat and overload protector according to claim 3 is characterized in that: The load connection terminal (21) of the second protector (2) is electrically connected to the power pin (11) of the first protector (1) via a lead wire or a conductive sheet.
7. The combined structure of an overheat and overload protector according to claim 1, characterized in that: The load socket (12) of the first protector (1) is used to be connected to the main and auxiliary windings of the compressor motor (4) and the lead-out terminal C.
8. The combined structure of an overheat and overload protector according to claim 1, characterized in that: The second protector (2) is a fuse.
9. The combined structure of an overheat and overload protector according to claim 1, characterized in that: The base (3) is formed with a positioning plate (34) at the bottom, and the positioning plate (34) is formed with a winding terminal clearance cavity (341) at the bottom. During installation, the main winding lead-out terminal M and the auxiliary winding lead-out terminal S of the compressor motor (4) pass through the winding terminal clearance cavity (341) and are adapted to be installed in the winding terminal clearance cavity (341).