Thermal relay open-phase structure
The thermal relay phase-loss structure addresses low processing accuracy and assembly issues by using a differential mechanism between shells and a control rod to enhance phase-loss protection efficiency.
Patent Information
- Application Number
- CN202420012350.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-02
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-01-02
AI Technical Summary
Existing thermal relays with phase loss protection mechanisms have issues with low processing accuracy, efficiency, and assembly difficulty due to their plane-based differential mechanism design.
A thermal relay phase-loss structure incorporating a first and second linkage bracket with a control rod and bimetallic strips, allowing for a differential action between shells to accelerate phase-loss protection, facilitated by a flip mechanism.
Enhances the efficiency of phase-loss protection by generating a differential action between shells, ensuring rapid disconnection of contacts during phase failure, thus improving the thermal relay's protective function.
Smart Images
Figure CN222214071U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermal relays, in particular to a thermal relay phase loss structure. Background Art
[0002] Thermal relays are protective devices used for overload protection of motors or other electrical equipment and electrical circuits. The action mechanisms used in common thermal relays have panel operation functions that are all implemented using separate buttons. For example, pressing the stop button implements the stop function, pressing or toggling the test button implements the mechanism tripping function, and pressing the reset button implements the tripping reset function. They each use independent buttons to implement the corresponding functions separately, which plays an important role in the realization of product functions.
[0003] At present, in order to facilitate the thermal relay to have a phase loss protection function, a Chinese patent with the prior art publication number CN203553039U discloses a thermal relay. The utility model includes a three-phase bimetallic strip, an active push rod and a differential push rod. It also includes a first pull rod, a connecting rod, a second pull rod and a switching component. Through the above-mentioned structural cooperation, the thermal relay has a phase loss protection function.
[0004] However, the above-mentioned prior art still has the following problems when used: the above-mentioned thermal relay phase loss protection differential mechanism is only mature in plane technology, and the number of parts is not high in processing accuracy, low in processing efficiency, and difficult to assemble. Utility Model Content
[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a thermal relay phase-loss structure, which generates a differential action by moving between a first shell and a second shell, pushing a control rod to contact a flip mechanism, so that the thermal relay can accelerate its action when a phase failure occurs, thereby ensuring the efficient phase-loss protection action of the thermal relay, facilitating the realization of phase-loss protection, and solving the problems arising in the above-mentioned background technology.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a thermal relay phase-loss structure, comprising a thermal relay and a phase-loss component installed in the thermal relay, the phase-loss component comprising a first linkage bracket, a second linkage bracket and a flip mechanism, the second linkage bracket is arranged at the bottom of the first linkage bracket, a control rod and three bimetallic strips are passed through the first linkage bracket and the second linkage bracket, the three bimetallic strips are all connected to the thermal relay, the first linkage bracket comprises a first shell, the first shell is slidably arranged in the thermal relay, a concave groove, a rectangular groove and a convex groove 1 are opened at the bottom of the first shell, a first rotating shaft is arranged between the rectangular groove and the convex groove, three convex bumps 1 are fixedly arranged on the top of the first shell, the second linkage bracket comprises a second shell, a convex groove 2 and a convex groove 3 are opened on the top of the second shell, three convex bumps 2 are fixedly arranged on the top of the second shell, two U-shaped supporting feet are fixedly arranged on the bottom of the second shell, and a second rotating shaft is fixedly arranged between the two U-shaped supporting feet.
[0007] In a preferred embodiment, the top end of the control rod passes through the rectangular groove and the convex groove 1 of the first shell respectively, and the bottom end of the control rod passes through the convex groove 2 and the convex groove 3 of the second shell respectively. The control rod and the flip mechanism structure are used to realize the protection of the thermal relay from phase loss.
[0008] In a preferred embodiment, three bimetallic strips respectively penetrate the convex groove 1 of the first shell and the convex groove 2 and convex groove 3 of the second shell, so as to cooperate with the first shell and the second shell.
[0009] In a preferred embodiment, the cross-sections of the first shell and the second shell are both set to be rectangular, the top of the first shell is set to be a first plane, the bottom of the first shell is set to be a second plane, and the top of the second shell is set to be a U-shaped plane, and the U-shaped plane is in contact with the second plane to facilitate rapid assembly of the first shell and the second shell.
[0010] In a preferred embodiment, the cross-section of the control rod is processed into an upper and lower herringbone shape, the top of the control rod is processed with a U-shaped groove for being tangent to the first rotating shaft, the top of one side of the control rod is processed with an action contact plane, and the bottom of the control rod is processed with an L-shaped groove for being tangent to the second rotating shaft.
[0011] In a preferred embodiment, the three convex humps 1 are all arranged in a square shape, and the three convex humps 1 are distributed in a linear array at the bottom of the first shell for installation of the first shell.
[0012] In a preferred embodiment, the three convex hulls 2 are all arranged in a rectangular shape, and the three convex hulls 2 are distributed in a linear array on the top of the second shell, so as to fit the first shell and the second shell together.
[0013] Technical effects and advantages of the utility model:
[0014] The utility model generates a differential action by moving between the first shell and the second shell, pushing the control rod to contact the flip mechanism, so that the thermal relay can accelerate the action when a phase failure occurs. Compared with the prior art, the first shell, the second shell and the control rod constitute a differential mechanism in a spatial form, which ensures the efficient phase loss protection action of the thermal relay and is conducive to the realization of phase loss protection. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0016] Figure 2 It is a cross-sectional view of the thermal relay of the utility model;
[0017] Figure 3 It is a schematic diagram of the first housing, the second housing, the control rod and the bimetallic strip of the utility model;
[0018] Figure 4 This is a structural diagram of the first housing, the second housing, the control rod and the bimetallic strip of the utility model;
[0019] Figure 5 It is a bottom view of the first housing, the second housing and the control rod of the utility model;
[0020] Figure 6 It is a cross-sectional view of the first housing, the second housing and the control rod of the utility model;
[0021] Figure 7 It is a top view of the first shell of the utility model;
[0022] Figure 8 This is a bottom view of the first housing of the utility model;
[0023] Fig. 9 It is a top view of the second shell of the utility model;
[0024] Fig.10 It is a schematic diagram of a control rod of the utility model.
[0025] The reference numerals are: 1, thermal relay; 2, phase-loss assembly; 3, first linkage bracket; 4, second linkage bracket; 5, flip mechanism; 6, control lever; 7, bimetallic strip; 8, first plane; 9, second plane; 10, U-shaped plane; 11, U-shaped groove; 12, action contact plane; 13, L-shaped groove;
[0026] 301, first housing; 302, concave groove; 303, rectangular groove; 304, convex groove 1; 305, first rotating shaft; 306, convex hull 1;
[0027] 401, second shell; 402, convex groove two; 403, convex groove three; 404, convex bump two; 405, U-shaped supporting foot; 406, second rotating shaft. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0029] Refer to the instruction manual Figure 1-10 The utility model provides a thermal relay phase loss structure, comprising a thermal relay 1 and a phase loss component 2 installed in the thermal relay 1, wherein the phase loss component 2 comprises a first linkage bracket 3, a second linkage bracket 4 and a flip mechanism 5, wherein the second linkage bracket 4 is arranged at the bottom of the first linkage bracket 3, and a control rod 6 and three bimetallic strips 7 are passed through between the first linkage bracket 3 and the second linkage bracket 4, and the three bimetallic strips 7 are all connected to the thermal relay 1;
[0030] Specifically, the first linkage bracket 3 includes a first housing 301, the first housing 301 is slidably disposed in the thermal relay 1, a concave groove 302, a rectangular groove 303 and a convex groove 304 are provided at the bottom of the first housing 301, a first rotating shaft 305 is provided between the rectangular groove 303 and the convex groove, and three convex bumps 306 are fixedly provided at the top of the first housing 301;
[0031] Specifically, the second linkage bracket 4 includes a second shell 401, a convex groove 2 402 and a convex groove 3 403 are opened on the top of the second shell 401, three convex bumps 404 are fixedly provided on the top of the second shell 401, two U-shaped supporting legs 405 are fixedly provided on the bottom of the second shell 401, and a second rotating shaft 406 is fixedly provided between the two U-shaped supporting legs 405;
[0032] The top end of the control rod 6 respectively penetrates the rectangular groove 303 and the convex groove 1 304 of the first shell 301, and the bottom end of the control rod 6 respectively penetrates the convex groove 2 402 and the convex groove 3 403 of the second shell 401. The three bimetallic strips 7 respectively penetrate the convex groove 1 304 of the first shell 301 and the convex groove 2 402 and the convex groove 3 403 of the second shell 401.
[0033] Moreover, the cross-section of the control rod 6 is processed into an upper and lower herringbone shape, the top of the control rod 6 is processed with a U-shaped groove 11 for being tangent to the first rotating shaft 305, the top of one side of the control rod 6 is processed with an action contact plane 12, and the bottom of the control rod 6 is processed with an L-shaped groove 13 for being tangent to the second rotating shaft 406.
[0034] When in use, the thermal relay 1 is connected to the motor. When the thermal relay 1 is powered on, the three bimetallic strips 7 are heated and bent to the right, but the bending deflection is not enough, so the first housing 301 moves a short distance to the right, so that the thermal relay 1 does not operate. When the three bimetallic strips 7 are overloaded at the same time, the three bimetallic strips 7 are bent to the right at the same time, pushing the convex hull 306 of the first housing 301 to move to the right, driving the action contact plane 12 of the control rod 6 to drive the flip mechanism 5 to operate, so that the normally closed contact is immediately disconnected. At this time, the convex groove 30 After the phase is broken, the bimetallic strip 7 in 4 gradually cools down, causing the end to move to the left, pushing the convex bump 2 404 of the second housing 401 to move to the left, while the temperature of the bimetallic strip 7 in the convex groove 2 402 and the convex groove 3 403 rises, and the end bends to the right, pushing the first housing 301 to continue to move to the right. Since the first housing 301 and the second housing 401 move left and right, a differential action is generated, and the normally closed contact is opened through the amplification effect. Due to the differential action, the thermal relay 1 accelerates the action when a phase failure occurs to protect the motor.
[0035] Refer to the instruction manual Figure 7-9 The cross-sections of the first shell 301 and the second shell 401 are both set to be rectangular, the top of the first shell 301 is set to be a first plane 8, the bottom of the first shell 301 is set to be a second plane 9, and the top of the second shell 401 is set to be a U-shaped plane 10, and the U-shaped plane 10 is in contact with the second plane 9, so that the second shell 401 and the first shell can be assembled together for use;
[0036] The three convex humps 306 are all arranged in a square shape and are distributed in a linear array at the bottom of the first shell 301. The three convex humps 404 are all arranged in a rectangle shape and are distributed in a linear array at the top of the second shell 401, for the fitting of the first shell and the second shell 401.
[0037] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.
Claims
1. A thermal relay phase loss structure, comprising a thermal relay (1) and a phase loss component (2) installed in the thermal relay (1), characterized in that: The phase-loss component (2) comprises a first linkage bracket (3), a second linkage bracket (4) and a flip mechanism (5); the second linkage bracket (4) is arranged at the bottom of the first linkage bracket (3); a control rod (6) and three bimetallic strips (7) are passed through the first linkage bracket (3) and the second linkage bracket (4); the three bimetallic strips (7) are all connected to the thermal relay (1); The first linkage bracket (3) comprises a first shell (301), the first shell (301) is slidably arranged in the thermal relay (1), a concave groove (302), a rectangular groove (303) and a convex groove (304) are provided at the bottom of the first shell (301), a first rotating shaft (305) is provided between the rectangular groove (303) and the convex groove, and three convex bumps (306) are fixedly provided at the top of the first shell (301); The second linkage bracket (4) comprises a second shell (401), the top of the second shell (401) is provided with a convex groove 2 (402) and a convex groove 3 (403), the top of the second shell (401) is fixed with three convex bumps 2 (404), the bottom of the second shell (401) is fixed with two U-shaped supporting legs (405), and a second rotating shaft (406) is fixed between the two U-shaped supporting legs (405).
2. A thermal relay phase loss structure according to claim 1, characterized in that: The top end of the control rod (6) passes through the rectangular groove (303) and the convex groove 1 (304) of the first shell (301), and the bottom end of the control rod (6) passes through the convex groove 2 (402) and the convex groove 3 (403) of the second shell (401).
3. A thermal relay phase loss structure according to claim 1, characterized in that: The three bimetallic strips (7) respectively penetrate the convex groove 1 (304) of the first shell (301) and the convex groove 2 (402) and the convex groove 3 (403) of the second shell (401).
4. A thermal relay phase loss structure according to claim 1, characterized in that: The cross-sections of the first shell (301) and the second shell (401) are both arranged to be rectangular, the top of the first shell (301) is arranged to be a first plane (8), the bottom of the first shell (301) is arranged to be a second plane (9), and the top of the second shell (401) is arranged to be a U-shaped plane (10), and the U-shaped plane (10) is in contact with the second plane (9).
5. A thermal relay phase loss structure according to claim 1, characterized in that: The cross section of the control rod (6) is processed into an upper and lower herringbone shape, the top of the control rod (6) is processed with a U-shaped groove (11) for being tangent to the first rotating shaft (305), the top of one side of the control rod (6) is processed with an action contact plane (12), and the bottom of the control rod (6) is processed with an L-shaped groove (13) for being tangent to the second rotating shaft (406).
6. A thermal relay phase loss structure according to claim 1, characterized in that: The three convex hulls (306) are all arranged in a square shape, and the three convex hulls (306) are distributed in a linear array at the bottom of the first shell (301).
7. A thermal relay phase loss structure according to claim 1, characterized in that: The three convex hulls (404) are all arranged in a rectangular shape, and the three convex hulls (404) are distributed in a linear array on the top of the second shell (401).