Frequency converter overload protection device
By designing a spring structure between the wiring hood and the plug terminal in the inverter, disconnecting the power supply during overload, the inverter lacks overload protection, protecting internal components, and improving the stability and safety of the system.
Patent Information
- Application Number
- CN202422224334.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-11
AI Technical Summary
The existing inverters lack overload protection, resulting in long-term overload of internal components, increasing temperature, easy damage, increasing production costs and reducing system stability and safety.
A frequency converter overload protection device is designed. Through the spring structure between the wiring hood and the plug terminal, the wiring hood is melted by the tin strip during overload and pushes the wiring hood away from the plug terminal, disconnects the power supply, and protects the inverter components.
It realizes automatic disconnection of the power supply when the inverter is overloaded, protecting internal components, avoiding damage, and improving system stability and safety.
Smart Images
Figure CN223156692U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of overload protection, in particular to an overload protection device for a frequency converter. Background Technique
[0002] A frequency converter is a power control device that controls the speed of an AC motor by changing the frequency of the motor's working power supply. The frequency converter mainly consists of a rectifier, a filter, an inverter, etc. The working principle of the frequency converter is to adjust the voltage and frequency of the output power supply by the on-off of the internal IGBT, so as to provide a suitable power supply voltage according to the actual needs of the motor, achieving the purpose of energy saving and speed regulation. In addition, the frequency converter also has a variety of protection functions, such as overcurrent, overvoltage, overload protection, etc., to ensure the safe and stable operation of the motor.
[0003] The existing frequency converters usually do not have overload protection during operation, which makes the internal components work under overvoltage for a long time. At the same time, in the case of overload, the temperature inside the frequency converter will increase, which is likely to cause component damage, resulting in failures of the externally connected drive motors, increasing production costs, and reducing the stability and safety of the system operation. Therefore, an overload protection device for a frequency converter is proposed. Summary of the Invention
[0004] The purpose of the utility model is to provide an overload protection device for a frequency converter to solve the problem that the existing frequency converters do not have overload protection.
[0005] To achieve the above purpose, the utility model provides the following technical solution: An overload protection device for a frequency converter, including a frequency converter body, a frequency converter base is fixedly installed on the frequency converter body, installation through holes are provided at the four corners of the frequency converter base, a wiring port is provided on the frequency converter body, a wiring mechanism is provided at the wiring port, the wiring mechanism includes an insulating sleeve installed in the wiring port, a socket terminal is fixedly installed in the insulating sleeve, a wiring ferrule is movably installed in the insulating sleeve, a metal pin is fixedly installed on the wiring ferrule, a fixing screw is connected to the wiring ferrule, a protection mechanism is provided in the insulating sleeve, the protection mechanism includes a second spring provided between the wiring ferrule and the socket terminal, a metal slider is movably installed on the wiring ferrule, a solder bar is provided above the metal slider, a first spring is provided below the metal slider, and a limiting card slot is opened inside the insulating sleeve. The first spring will provide elastic force for the metal slider, making the metal slider have a tendency to move upward.
[0006] Preferably, an activity chute is opened at the bottom of the insulating sleeve, the fixing screw extends into the insulating sleeve through the activity chute, and a connecting wire is provided on the socket terminal. The fixing screw can fix the power cord in the wiring ferrule.
[0007] Preferably, a threaded hole is provided on the wiring terminal sleeve, and the fixing screw is connected to the wiring terminal sleeve through the threaded hole.
[0008] Preferably, the metal pins on the wiring terminal sleeve are aligned with the socket terminals front and back. One end of the connecting wire is fixed to the socket terminal, and the other end of the connecting wire is connected inside the wiring port. The wiring terminal sleeve can be connected to one side of the socket terminal through the connecting pins.
[0009] Preferably, insulating gaskets are provided at both ends of the second spring. One end of the second spring is located at the wiring terminal sleeve, and the other end of the second spring is located at the socket terminal. The insulating gaskets prevent current from passing through the second spring.
[0010] Preferably, a movable groove is provided on the wiring terminal sleeve, and the metal slider is movably installed on the wiring terminal sleeve through the movable groove. One end of the first spring is connected to the bottom of the metal slider, and the other end of the first spring is connected to the bottom of the movable groove. The first spring can push the solder strip upward.
[0011] Preferably, the solder strip is embedded in the insulating sleeve through the limit card slot. The wiring terminal sleeve is restricted to one side of the socket terminal by the solder strip. A card slot is provided on the socket terminal, and the metal pin is connected to the socket terminal through the card slot. The second spring can push the wiring terminal sleeve forward.
[0012] Compared with the prior art, the beneficial effects of the present utility model are:
[0013] 1. After the power cord is inserted into the wiring terminal sleeve in this application, the fixing screw can be tightened to fix the power cord in the wiring terminal sleeve. After the power cord is fixed in the wiring terminal sleeve, the wiring terminal sleeve can be pushed forward to insert the metal pins into the socket terminals. When the metal pins are inserted into the socket terminals, the solder strip is embedded in the limit card slot, thereby restricting the movement of the wiring terminal sleeve and keeping the power cord stably connected.
[0014] 2. Once the inverter body is overloaded in this application, the current passing through the wiring terminal sleeve will increase, causing the heat generation of the wiring terminal sleeve to increase. The increased heat will cause the solder strip to melt. After the solder strip melts, the second spring will reset. After the second spring resets, it will push the wiring terminal sleeve forward to separate the metal pins from the socket terminals, disconnecting the power supply of the inverter when it is overloaded. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic diagram of the overall structure of the present utility model;
[0016] Figure 2 is a schematic diagram of the partial structure of the present utility model;
[0017] Figure 3Schematic diagram of the wiring mechanism of the present utility model;
[0018] Figure 4 Schematic diagram of the protection mechanism of the present utility model;
[0019] Figure 5 For the present utility model Figure 4 Enlarged view of location A in the present utility model.
[0020] Reference numerals in the figure: 1, frequency converter body; 2, frequency converter base; 3, installation through-hole; 4, wiring port; 5, wiring mechanism; 501, insulating sleeve; 502, wiring ferrule; 503, metal pin; 504, socket terminal; 505, connecting wire; 506, fixing screw; 507, movable chute; 6, protection mechanism; 601, first spring; 602, metal slider; 603, solder bar; 604, limit card slot; 605, second spring; 606, insulating gasket. Specific embodiments
[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0022] As Figure 1 And Figure 2 Shown, the present utility model provides a technical solution for an overload protection device of a frequency converter, including a frequency converter body 1, a frequency converter base 2 fixedly installed on the frequency converter body 1, installation through-holes 3 provided at the four corners of the frequency converter base 2, a wiring port 4 provided on the frequency converter body 1, a wiring mechanism 5 provided at the wiring port 4, and a protection mechanism 6 provided in the insulating sleeve 501. By the combined use of the wiring mechanism 5 and the protection mechanism 6, the power supply of the frequency converter can be disconnected when the frequency converter is overloaded, protecting the frequency converter components.
[0023] As Figure 2 And Figure 3 Shown, the wiring mechanism 5 includes an insulating sleeve 501 installed in the wiring port 4, a socket terminal 504 fixedly installed in the insulating sleeve 501, a wiring ferrule 502 movably installed in the insulating sleeve 501, a metal pin 503 fixedly installed on the wiring ferrule 502, a fixing screw 506 connected to the wiring ferrule 502, a movable chute 507 opened at the bottom of the insulating sleeve 501, the fixing screw 506 extends into the insulating sleeve 501 through the movable chute 507, and a connecting wire 505 is provided on the socket terminal 504.
[0024] Specifically, after the power cord is inserted into the wiring terminal sleeve 502, the fixing screw 506 can be tightened to fix the power cord within the wiring terminal sleeve 502. After the power cord is fixed within the wiring terminal sleeve 502, the wiring terminal sleeve 502 can be pushed forward to insert the metal pin 503 into the socket terminal 504. When the metal pin 503 is inserted into the socket terminal 504, the solder bar 603 is embedded into the limit card slot 604, thereby restricting the movement of the wiring terminal sleeve 502 and keeping the power cord stably connected.
[0025] As Figure 2 , Figure 4 and Figure 5 shown, the protection mechanism 6 includes a second spring 605 disposed between the wiring terminal sleeve 502 and the socket terminal 504. A metal slider 602 is movably installed on the wiring terminal sleeve 502. A solder bar 603 is disposed above the metal slider 602. A first spring 601 is disposed below the metal slider 602. A limit card slot 604 is formed inside the insulating sleeve 501. Insulating gaskets 606 are provided at both ends of the second spring 605. One end of the second spring 605 is located at the wiring terminal sleeve 502, and the other end of the second spring 605 is located at the socket terminal 504.
[0026] Specifically, once the inverter body 1 is overloaded, the current passing through the wiring terminal sleeve 502 will increase, causing the heat generation of the wiring terminal sleeve 502 to increase. The increased heat will melt the solder bar 603. After the solder bar 603 melts, the second spring 605 will reset. After the second spring 605 resets, it will push the wiring terminal sleeve 502 forward to disengage the metal pin 503 from the socket terminal 504, disconnecting the power supply of the inverter during overload.
[0027] Working principle: When in use, first fix the connecting wire 505 in the wiring port 4 on the inverter body 1. After the connecting wire 505 is fixed in the wiring port 4 on the inverter body 1, the power cord can be inserted into the wiring sleeve 502. After the power cord is inserted into the wiring sleeve 502, the fixing screw 506 can be tightened to fix the power cord in the wiring sleeve 502. After the power cord is fixed in the wiring sleeve 502, the wiring sleeve 502 can be pushed forward to insert the metal pin 503 into the socket terminal 504, thereby connecting the power supply of the inverter body 1. Since, one end of the first spring 601 is connected to the bottom of the metal slider 602, and the other end of the first spring 601 is connected to the bottom of the movable groove, after the metal pin 503 is inserted into the socket terminal 504, the first spring 601 will push the metal slider 602 upward When the metal slider 602 moves upward, it will drive the tin bar 603 to embed into the limit card slot 604, so as to limit the movement of the wiring sleeve 502. During the use of the inverter body 1, the current will pass through the wiring sleeve 502, causing the wiring sleeve 502 to heat up. Once the inverter body 1 is overloaded, the current passing through the wiring sleeve 502 will increase, causing the heat generated by the wiring sleeve 502 to increase, and melt the tin bar 603. Since one end of the second spring 605 is located at the wiring sleeve 502, and the other end of the second spring 605 is located at the socket terminal 504, the second spring 605 will reset after the tin bar 603 melts. After the second spring 605 is reset, it will push the wiring sleeve 502 to move forward, causing the metal pin 503 to disengage from the socket terminal 504, and disconnect the power supply of the inverter when the inverter is overloaded, thereby protecting the inverter components.
[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. An overload protection device for a frequency converter, comprising a frequency converter body (1), a frequency converter base (2) is fixedly installed on the frequency converter body (1), mounting through holes (3) are provided at four corners of the frequency converter base (2), and a wiring port (4) is provided on the frequency converter body (1), characterized in that: A wiring mechanism (5) is provided at the wiring port (4). The wiring mechanism (5) includes an insulating sleeve (501) installed inside the wiring port (4). A socket terminal (504) is fixedly installed inside the insulating sleeve (501). A wiring ferrule (502) is movably installed inside the insulating sleeve (501). A metal pin (503) is fixedly installed on the wiring ferrule (502). A fixing screw (506) is connected to the wiring ferrule (502). A protection mechanism (6) is provided inside the insulating sleeve (501). The protection mechanism (6) includes a second spring (605) provided between the wiring ferrule (502) and the socket terminal (504). A metal slider (602) is movably installed on the wiring ferrule (502). A solder bar (603) is provided above the metal slider (602). A first spring (601) is provided below the metal slider (602). A limit card slot (604) is formed inside the insulating sleeve (501).
2. The overload protection device for a frequency converter according to claim 1, wherein: An activity chute (507) is formed at the bottom of the insulating sleeve (501). The fixing screw (506) extends into the insulating sleeve (501) through the activity chute (507). A connecting wire (505) is provided on the socket terminal (504).
3. The overload protection device for a frequency converter according to claim 2, characterized in that: A threaded hole is formed in the wiring ferrule (502). The fixing screw (506) is connected to the wiring ferrule (502) through the threaded hole.
4. The overload protection device for a frequency converter according to claim 3, characterized in that: The metal pin (503) on the wiring ferrule (502) is aligned with the socket terminal (504) front and back. One end of the connecting wire (505) is fixed on the socket terminal (504). The other end of the connecting wire (505) is connected inside the wiring port (4).
5. An overload protection device for a frequency converter according to claim 4, characterized in that: Insulating gaskets (606) are provided at both ends of the second spring (605). One end of the second spring (605) is located at the wiring ferrule (502). The other end of the second spring (605) is located at the socket terminal (504).
6. The overload protection device for a frequency converter according to claim 1, characterized in that: An activity slot is formed in the wiring ferrule (502). The metal slider (602) is movably installed on the wiring ferrule (502) through the activity slot. One end of the first spring (601) is connected to the bottom of the metal slider (602). The other end of the first spring (601) is connected to the bottom of the activity slot.
7. An overload protection device for a frequency converter according to claim 1, characterized in that: The solder bar (603) is embedded into the insulating sleeve (501) through the limit card slot (604). The wiring ferrule (502) is restricted to one side of the socket terminal (504) through the solder bar (603). A card slot is formed on the socket terminal (504). The metal pin (503) is connected to the socket terminal (504) through the card slot.