Frequency converter with protection mechanism

Abstract

The invention relates to the technical field of frequency converters, and provides a frequency converter with a protection mechanism, the frequency converter comprises a frequency converter body installed in a control cabinet, a hinged cabinet door is arranged at the front end of the control cabinet, the frequency converter further comprises a base, a fixed shield, a movable shield and a connecting mechanism, the base is fixed to the inner side of the control cabinet through bolts, and the frequency converter body is elastically installed on the base; the movable shield and the heat dissipation fan are installed on the cabinet door, synchronous opening and closing of the frequency converter body are achieved through opening and closing of the cabinet door, and opening convenience and protection and heat dissipation effects after closing are both considered. The fixed protective cover and the movable protective cover are made of anti-interference materials, the frequency converter body is grounded, electromagnetic interference of equipment such as an electric welding machine is effectively reduced, and meanwhile two sets of buffer rings between the base and the frequency converter body reduce vibration influence of equipment such as a punching machine. The heat dissipation fan is matched with the flow guide cover, and the frequency converter body is heightened through the connection mechanism, so that comprehensive heat dissipation is achieved, heat is quickly conducted out, and long-time stable operation of the frequency converter in the control cabinet is ensured.

Description

Technical Field

[0001] The present invention relates to the field of frequency converters, and more specifically, to a frequency converter with a protection mechanism. Background Art

[0002] The frequency converter is an electronic device used to control the speed and torque of an AC motor. It achieves precise control of the motor by changing the frequency and voltage of the power supply. Its core components include a rectifier unit, a filter unit, an inverter unit, a control unit, and a protection unit. The working principle is to rectify the industrial frequency AC power into DC power, and then invert it into AC power with variable frequency and voltage, thereby adjusting the motor speed. The frequency converter has functions such as speed control, energy-saving operation, soft start, multi-speed control, and PID control. It is widely used in industrial automation, HVAC systems, elevators, water pumps, fans, and renewable energy. Its advantages include energy saving and high efficiency, precise control, extended equipment life, and strong adaptability. However, factors such as motor power, load type, input voltage, and environmental conditions must be considered when selecting the inverter. The operating temperature of the inverter should usually be between -10°C and 40°C.

[0003] First, it is a common installation method to install the inverter in a control cabinet. When the inverter is installed in a poorly ventilated control cabinet, if the ambient temperature is high or it is continuously running at high load, it is necessary to strengthen the heat dissipation. However, the traditional cooling fan placed inside the control cabinet cannot dissipate heat from the inverter in all directions, especially when it is installed in a position facing away from the cooling fan and the control cabinet. Excessive local temperature will increase the failure rate of the inverter.

[0004] Secondly, when the inverter is installed in a hardware production workshop, high temperatures as described above will appear. At the same time, heavy machinery such as stamping machines and presses in the workshop will generate large vibrations during operation. Traditional inverters are completely fixed in the control cabinet and will be affected by the vibration of the equipment, accelerating the loosening and damage of the internal rectifier unit, filter unit, inverter unit, and control unit.

[0005] Finally, the high-power welding machines, various sensors and controllers in the hardware production workshop will interfere with the inverter and affect the stability of the inverter.

[0006] In order to solve the above problems, the present application proposes a frequency converter with a protection mechanism. Summary of the invention

[0007] The object of the present invention is to provide a frequency converter with a protection mechanism, which solves the problems in the prior art by combining all-round heat dissipation, buffering and anti-interference of the frequency converter.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A frequency converter with a protective mechanism, comprising a frequency converter body installed in a control cabinet, a hinged cabinet door being provided at the front end of the control cabinet, and further comprising:

[0010] The base is fixed to the inner side of the control cabinet by bolts, the inverter body is elastically mounted on the base, and a mounting hole fixed to the inverter body is provided in the base;

[0011] Fixed protective cover, fixedly installed at the front end of the base and covering the outside of the inverter body;

[0012] The dynamic shield is fixed on the inner side of the cabinet door and can be connected with the fixed shield to form a complete shield outside the inverter body. The anti-interference shield effectively shields external interference, such as interference from welding machines. The fixed shield and the dynamic shield are both made of anti-interference materials and grounded. An air duct for internal and external air flow is provided between the fixed shield and the dynamic shield. The air duct realizes internal and external air flow circulation under the action of the cooling fan, which can resist interference and dissipate heat at the same time.

[0013] The connecting mechanism installs the inverter body and the fixed protective cover on the base and forms a buffer through two groups of buffer rings arranged inside and outside. The inverter body is suspended at the front end of the base through the buffer ring. The buffer ring reduces the impact of vibration and impact of heavy equipment in the workshop on the inverter. The connecting mechanism can simultaneously connect the inverter body and the fixed protective cover to the base, reducing the space required for connection and making the structure more compact.

[0014] The fixed shield is provided with symmetrical exhaust ports on both sides near the base, and a number of guide plates distributed in a stepped manner are provided on both sides inside the fixed shield. The guide plates are also located on the side of the inverter body and do not contact it. The distance between the steps formed by the multiple guide plates and the inverter body decreases gradually from the driven shield to the base. The stepped guide plates enhance the contact effect between the airflow and the inverter body and improve the heat dissipation efficiency. The upper and lower ends of the fixed shield near the base are provided with cable grooves for accommodating the inverter body connection lines.

[0015] The side of the dynamic shield close to the cabinet door is provided with an air inlet, which ensures the effective entry of external cold air. The outer side of the dynamic shield is provided with a plurality of fixing ears fixed to the cabinet door by screws. The dynamic shield is installed on the cabinet door and cooperates with the fixed shield to link the cabinet door to open and close on the control cabinet, ensuring heat dissipation and anti-interference while facilitating operation.

[0016] A guide cover is fixed inside the dynamic shield near one side of the fixed shield, a shunt pipe is provided through the middle of the guide cover facing the inverter body, a channel is formed between the outer periphery of the guide cover and the dynamic shield to guide the airflow to the outer periphery of the inverter body, and the inner and outer channels formed by the guide cover can evenly blow the airflow generated by the cooling fan to the inverter body, thereby ensuring the heat dissipation effect.

[0017] A cooling fan is fixedly connected to the inside of the dynamic shield. The cooling fan forces air to flow, thereby ensuring the cooling effect under high load or high temperature environment. A cable arrangement hole for the cooling fan is provided in the dynamic shield. The cable arrangement hole facilitates the arrangement of the power line of the cooling fan. The cooling fan is also located between the air inlet and the air guide cover. The cooling fan drives air to enter from the air inlet and is diffused by the air guide cover before being blown toward the inverter body.

[0018] The air guide cover is conically set on the side away from the inverter body. The conical design of the air guide cover allows the airflow to be evenly diffused to avoid local overheating. An airflow passage space is formed between the diverter pipe and the inverter body. When the airflow flows to the inverter body, it flows outward through the gap between the two to ensure the airflow circulation effect.

[0019] The connecting mechanism also includes a connecting rod and a clamping nut. A pressure plate is fixed to one end of the connecting rod close to the base, and a support platform is fixed to the other end. A first threaded portion that cooperates with the threaded hole is provided at one end of the connecting rod close to the base, and a second threaded portion that cooperates with the clamping nut is provided at the other end of the connecting rod.

[0020] The two groups of buffer rings are both fitted on the outer end of the connecting rod, one group is supported between the base and the inverter body, and while buffering, a space for air flow is left between the base and the inverter body to ensure the heat dissipation effect. The other group is supported between the inverter body and the pressure plate. The connecting rod and the buffer ring cooperate to achieve elastic installation of the inverter body and reduce the impact of vibration. The inverter body is elastically connected to the front end of the base through the spiral of the first threaded part and the threaded hole and the two groups of buffer rings.

[0021] A clamping ear that fits over the outside of the connecting rod is fixed on the inner side of the fixed protective cover. The clamping ear is pressed onto the support platform through the clamping nut and the spiral of the second threaded part, thereby fixing the fixed protective cover to the front end of the base. The cooperation of the connecting rod and the clamping nut simplifies the installation structure of the protective cover. At the same time, the clamping ear is fixed to the connecting rod through the clamping nut to ensure that the fixed protective cover is firmly installed on the base.

[0022] Beneficial effects of the present invention:

[0023] The present invention installs the dynamic protective cover and the heat dissipation fan on the cabinet door, and realizes the synchronous opening and closing of the inverter body by relying on the opening and closing of the cabinet door on the control cabinet, which can not only ensure the convenience of opening, but also ensure the protection and heat dissipation effect after closing;

[0024] The present invention covers the inverter body inside the control cabinet through a fixed shield and a dynamic shield. Both the fixed shield and the dynamic shield are made of anti-interference materials and the inverter body is grounded, which can reduce the influence of the electric welding machine in the workshop on the inverter body. At the same time, two groups of buffer rings arranged at the connection between the base and the inverter body can play a buffering function, reducing the influence of the operation of large equipment such as a punching machine in the workshop on the inverter body.

[0025] The present invention arranges cooling fans inside the fixed shield and the dynamic shield, and then utilizes a connecting mechanism to raise the inverter body on the base, and cooperates with the air guide cover to form comprehensive heat dissipation outside the inverter body, thereby being able to quickly bring out the heat generated in the inverter body, ensuring that the inverter can be used stably for a long time inside the control cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the structure of the present invention installed in a control cabinet;

[0028] Figure 2 This is a schematic diagram of the inverter protection status from a top view and half section;

[0029] Figure 3 It is a schematic diagram of the structure of the connection mechanism cut from the side when the inverter, the base and the fixed shield are combined;

[0030] Figure 4 This is a schematic diagram of the structure of the inverter, base and fixed cover connection;

[0031] Figure 5 is a structural schematic diagram of the connecting mechanism;

[0032] Figure 6 It is a schematic diagram of the structure of the split dynamic shield, air guide cover and cooling fan;

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] In the figure: 1. inverter body; 2. control cabinet; 21. cabinet door; 3. base; 31. threaded hole; 32. mounting hole; 4. fixed shield; 41. exhaust port; 42. guide plate; 43. cable tray; 44. clamping ear; 5. dynamic shield; 51. air inlet; 52. fixing ear; 53. cable tray hole; 6. connecting mechanism; 61. connecting rod; 611. pressure plate; 612. support platform; 613. first threaded portion; 614. second threaded portion; 62. buffer ring; 63. clamping nut; 7. guide cover; 71. shunt pipe; 8. cooling fan. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] like Figure 1 - Figure 6 As shown: This embodiment provides a frequency converter with a protective mechanism, including a frequency converter body 1 installed in a control cabinet 2, a hinged cabinet door 21 is provided at the front end of the control cabinet 2, and also includes:

[0037] The base 3 is fixed to the inner side of the control cabinet 2 by bolts, and the inverter body 1 is elastically mounted on the base 3. The base 3 is provided with a mounting hole 32 fixedly connected to the inverter body 1;

[0038] A fixed protective cover 4 is fixedly mounted on the front end of the base 3 and covers the outer side of the inverter body 1;

[0039] The dynamic shield 5 is fixed to the inner side of the cabinet door 21 and can be connected with the fixed shield 4 to form a complete protective shield outside the inverter body 1. The fixed shield 4 and the dynamic shield 5 are both made of anti-interference materials and grounded. An air duct for internal and external air flow is provided between the fixed shield 4 and the dynamic shield 5;

[0040] The connecting mechanism 6 mounts the inverter body 1 and the fixed shield 4 on the base 3 and forms a buffer through two groups of buffer rings 62 arranged inside and outside. The inverter body 1 is suspended at the front end of the base 3 through the buffer rings 62.

[0041] As an embodiment of the present invention, the fixed shield 4 and the dynamic shield 5 form an air duct inside while protecting the inverter body 1. The buffer ring 62 can raise the inverter body 1 on the base 3. The raising setting cooperates with the air duct and realizes comprehensive heat dissipation of the inverter body 1 with the cooperation of the air guide cover 7 and the cooling fan 8.

[0042] Specifically, the fixed shield 4 is provided with symmetrical exhaust ports 41 on both sides close to the base 3, and a plurality of guide plates 42 are provided on both sides inside the fixed shield 4 in a stepped manner. The fixed shield 4 is provided with a cable groove 43 for accommodating the connection wires of the inverter body 1 at the upper and lower ends close to the base 3;

[0043] As an embodiment of the present invention, the airflow flows from the driven shield 5 to the fixed shield 4. At this time, the airflow is fully in contact with the inverter body 1 by the stepped guide plate 42, and then the airflow carrying heat is discharged outward from the exhaust port 41 to the control cabinet 2, and the ventilation or heat dissipation structure in the control cabinet 2 is used to diffuse the heat outward.

[0044] Specifically, an air inlet 51 is provided on the side of the dynamic shield 5 close to the cabinet door 21, and a plurality of fixing ears 52 are provided on the outer side of the dynamic shield 5 and fixed to the cabinet door 21 by screws;

[0045] As an embodiment of the present invention, cold air enters the dynamic protective cover 5 through the air inlet 51 under the action of the cooling fan 8, and then the cold air is blown toward the fixed protective cover 4 and the inverter body 1 through the air guide cover 7. The dynamic protective cover 5 is fixed to the cabinet door 21 by screws passing through the fixing ears 52.

[0046] Specifically, a guide cover 7 is fixed to one side of the dynamic shield 5 near the fixed shield 4, a shunt pipe 71 is provided through the middle of the guide cover 7 and faces the inverter body 1, a channel for guiding the airflow to the periphery of the inverter body 1 is formed between the outer periphery of the guide cover 7 and the dynamic shield 5, the guide cover 7 is tapered on the side away from the inverter body 1, and an airflow passage space is formed between the shunt pipe 71 and the inverter body 1;

[0047] As an embodiment of the present invention, after the cooling fan 8 is activated, the airflow is blown toward the air guide cover 7, a part of the airflow is directly blown toward the inverter body 1 through the diversion pipe 71, and the other part is blown toward the side of the inverter body 1 through the gap between the air guide cover 7 and the dynamic protective cover 5, so that the airflow is diffused more evenly, thereby ensuring the heat dissipation effect.

[0048] Specifically, a heat dissipation fan 8 is fixedly connected to the inside of the dynamic shield 5, and a cable arrangement hole 53 for the heat dissipation fan 8 is opened in the dynamic shield 5. The heat dissipation fan 8 is also located between the air inlet 51 and the air guide cover 7. The heat dissipation fan 8 drives air to enter from the air inlet 51 and diffuse through the air guide cover 7 and then blows toward the inverter body 1;

[0049] As an implementation mode of the present invention, the heat dissipation fan 8 is fixed in the dynamic shield 5 by means of screws, snap-fitting, etc., and is externally connected to a power line through the wiring hole 53 .

[0050] Specifically, the connection mechanism 6 also includes a connecting rod 61 and a clamping nut 63. A pressure plate 611 is fixed to one end of the connecting rod 61 close to the base 3, and a support platform 612 is fixed to the other end. A first threaded portion 613 cooperating with the threaded hole 31 is provided at one end of the connecting rod 61 close to the base 3, and a second threaded portion 614 cooperating with the clamping nut 63 is provided at the other end of the connecting rod 61. Two groups of buffer rings 62 are both sleeved on the outer end of the connecting rod 61, one group is supported between the base 3 and the inverter body 1, and the other group is supported between the inverter body 1 and the pressure plate 611. The inverter body 1 is elastically connected to the front end of the base 3 through the first threaded portion 613 and the spiral of the threaded hole 31 and the two groups of buffer rings 62.

[0051] As an embodiment of the present invention, a buffer ring 62 is first put on one end of the connecting rod 61 close to the first threaded portion 613, and then the connecting rod 61 is passed through the mounting hole of the inverter body 1. After the connecting rod 61 is passed through, another buffer ring 62 is put on. The first threaded portion 613 is spirally connected with the threaded hole 31, and the inverter body 1 is connected to the front end of the base 3 through the two buffer rings 62 through the clamping force of the thread. The connecting rod 61 is screwed together through the outer polygon of the support platform 612 and the sleeve.

[0052] Specifically, a clamping ear 44 is fixed to the inner side of the fixed shield 4 and is sleeved on the outer side of the connecting rod 61. The clamping ear 44 is pressed on the support platform 612 by the screw of the clamping nut 63 and the second threaded portion 614, thereby fixing the fixed shield 4 to the front end of the base 3.

[0053] As an embodiment of the present invention, the fixed protective cover 4 is connected to the base 3 along the outside of the inverter body 1. At this time, the second threaded portion 614 passes through the clamping ear 44, and the bottom of the clamping ear 44 contacts the support platform 612. The fixed protective cover 4 fits with the base 3, and then the clamping nut 63 is screwed on the outside of the second threaded portion 614, and the fixed protective cover 4 is clamped and fixed to the front end of the base 3 by the thread pressure.

[0054] Specifically, the guide plate 42 is also located at the side of the inverter body 1 without contacting it, and the distance between the step-shaped structure formed by the plurality of guide plates 42 and the inverter body 1 decreases from the driven shield 5 to the base 3 .

[0055] It can be understood that the present invention achieves synchronous opening and closing of the inverter body by installing the dynamic shield and the heat dissipation fan on the cabinet door and utilizing the cabinet door opening and closing, thereby taking into account both the convenience of opening and the protection and heat dissipation effect after closing. The fixed shield and the dynamic shield are made of anti-interference materials and the inverter body is grounded, which effectively reduces the electromagnetic interference of equipment such as welding machines. At the same time, the two sets of buffer rings between the base and the inverter body reduce the vibration of equipment such as stamping machines. The heat dissipation fan cooperates with the guide cover, combined with the connection mechanism to raise the inverter body, to form comprehensive heat dissipation, quickly extract heat, and ensure that the inverter runs stably in the control cabinet for a long time.

[0056] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicate orientation or positional relationship, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0057] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A frequency converter with a protective mechanism, comprising a frequency converter body installed in a control cabinet, wherein a hinged cabinet door is provided at the front end of the control cabinet, characterized in that: Also includes: The base is fixed to the inner side of the control cabinet by bolts, the inverter body is elastically mounted on the base, and a mounting hole fixed to the inverter body is provided in the base; Fixed protective cover, fixedly installed at the front end of the base and covering the outside of the inverter body; A dynamic shield is fixed to the inner side of the cabinet door and can be connected with the fixed shield to form a complete shield outside the inverter body. The fixed shield and the dynamic shield are both made of anti-interference materials and grounded. An air duct for internal and external airflow is provided between the fixed shield and the dynamic shield; The connecting mechanism installs the inverter body and the fixed protective cover on the base and forms a buffer through two groups of buffer rings arranged inside and outside. The inverter body is suspended at the front end of the base through the buffer ring.

2. The frequency converter with a protection mechanism according to claim 1, characterized in that: The fixed shield is provided with symmetrical exhaust ports on both sides close to the base, and a number of guide plates distributed in a stepped manner are provided on both sides inside the fixed shield. The upper and lower ends of the fixed shield close to the base are provided with cable grooves for accommodating the inverter body connection lines.

3. The frequency converter with a protection mechanism according to claim 1, characterized in that: An air inlet is arranged on the side of the dynamic protective cover close to the cabinet door, and a plurality of fixing ears fixed to the cabinet door by screws are arranged on the outer side of the dynamic protective cover.

4. The frequency converter with a protection mechanism according to claim 3, characterized in that: A flow guide cover is fixed inside the dynamic shield near the fixed shield, a shunt pipe facing the inverter body is provided through the middle of the flow guide cover, and a channel for guiding airflow to the periphery of the inverter body is formed between the periphery of the flow guide cover and the dynamic shield.

5. The frequency converter with a protection mechanism according to claim 4, characterized in that: A cooling fan is fixedly connected to the inside of the dynamic shield, and a cable arrangement hole for the cooling fan is opened in the dynamic shield. The cooling fan is also located between the air inlet and the air guide cover. The cooling fan drives air to enter from the air inlet and is diffused by the air guide cover and then blown toward the inverter body.

6. The frequency converter with a protection mechanism according to claim 4, characterized in that: The side of the air guide cover away from the inverter body is conical, and an air flow passage space is formed between the shunt pipe and the inverter body.

7. The frequency converter with a protection mechanism according to claim 6, characterized in that: The connecting mechanism also includes a connecting rod and a clamping nut. A pressure plate is fixed to one end of the connecting rod close to the base, and a support platform is fixed to the other end. A first threaded portion that cooperates with the threaded hole is provided at one end of the connecting rod close to the base, and a second threaded portion that cooperates with the clamping nut is provided at the other end of the connecting rod.

8. The frequency converter with a protection mechanism according to claim 1, characterized in that: The two groups of buffer rings are both fitted on the outer end of the connecting rod, one group is supported between the base and the inverter body, and the other group is supported between the inverter body and the pressure plate. The inverter body is elastically connected to the front end of the base through the spiral of the first threaded part and the threaded hole and the two groups of buffer rings.

9. The frequency converter with a protection mechanism according to claim 8, characterized in that: A clamping ear which is sleeved on the outside of the connecting rod is fixed on the inner side of the fixed protective cover. The clamping ear is pressed on the support platform by the clamping nut and the second threaded part, so as to fix the fixed protective cover on the front end of the base.

10. The frequency converter with a protection mechanism according to claim 2, characterized in that: The guide plate is also located on the side of the inverter body without contacting it, and the distance between the step-shaped shape formed by the multiple guide plates and the inverter body decreases from the driven shield to the base.

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