Anti-harmonic intelligent capacitor

Abstract

According to the technical scheme, the anti-harmonic intelligent capacitor is characterized in that the anti-harmonic intelligent capacitor comprises a shell, a side plate, a capacitor assembly, a filtering assembly, a connecting assembly and a control assembly, an opening is formed in the side face of the shell and covers the filtering assembly, the side plate is detachably connected with the shell and covers the opening, and the capacitor assembly comprises a fixing shell; a partition plate is further fixedly connected in the shell, the control assembly and the connecting assembly are arranged above the partition plate, a pressing piece used for fixing the fixing shell is further detachably connected below the partition plate, a groove is further formed in the top of the fixing shell, the side face of the pressing piece abuts against the side face of the groove, and the contact face of the pressing piece and the fixing shell is arranged on the bottom face of the groove. According to the utility model, the contact surface of the pressing piece and the fixed shell is arranged on the bottom surface of the groove, so that the pressing piece can be conveniently positioned during installation, and the side surface of the pressing piece is propped against the side surface of the groove, so that the fixed shell can be prevented from laterally sliding.

Description

Technical Field

[0001] The utility model relates to a capacitor, and more specifically, to an anti-harmonic intelligent capacitor. Background Art

[0002] Anti-harmonic low-voltage capacitors are designed for situations where the harmonic content of the power network is high and conventional capacitors cannot operate normally. They are mainly used in places where the current harmonic content is less than 40% (such as inverters and other equipment). They can not only meet the requirements of reactive power compensation and improve power factor, but also eliminate the impact of high-order harmonics on the system and improve the quality of electricity use.

[0003] For example, the Chinese patent with patent number CN202010197595.X discloses "Anti-harmonic capacitor", which makes the shell of the anti-harmonic capacitor more convenient and quick to install, disassemble and repair by setting the shell of the anti-harmonic capacitor in a form in which the bottom plate is connected to the shell, and sets a heat dissipation groove and a baffle on the side of the shell on one side of the capacitor to achieve rapid heat dissipation, thereby improving the working quality and service life of the anti-harmonic capacitor. In order to improve the heat dissipation effect, the current capacitors have large openings at the lower ends of the two side walls to leak out the internal capacitors and reactors for rapid ventilation. However, in the actual use of the smart capacitor, it is found that the anti-harmonic capacitor is at low voltage and low power during normal use. This small-range passive heat dissipation can It can play an effective role, and the rated voltage of the anti-harmonic smart capacitor is usually more than 400V, which is medium and high voltage. The power is high in the working state, and the heat is usually accumulated in the filter component and the capacitor. It is difficult for a small range of passive heat dissipation to play an effective role. If the side panel of the shell is directly removed, although the heat exchange efficiency can be effectively increased, on the one hand, the shell cannot effectively protect other components from the side, and the safety is greatly reduced. On the other hand, since the volume of the anti-harmonic smart capacitor is usually large, it is time-consuming and laborious to directly remove the side panel. Therefore, an anti-harmonic smart capacitor is needed. The device can only remove the side panel covering the filter component and the capacitor component, so as to better fix the capacitor component while ensuring the heat dissipation efficiency, thereby increasing safety.

[0004] In view of the above reasons, how to better fix the capacitor component is exactly the problem considered in this application. Utility Model Content

[0005] In view of the shortcomings of the prior art, an anti-harmonic intelligent capacitor is provided. The device can remove only the side plates covering the filter component and the capacitor component, thereby better fixing the capacitor component while ensuring the heat dissipation efficiency, thereby increasing safety.

[0006] To achieve the above purpose, the following technical scheme is provided: an anti-harmonic intelligent capacitor, comprising a shell, a side plate, a capacitor assembly, a filter assembly, a connection assembly and a control assembly, wherein the connection assembly and the control assembly are both installed on the surface of the shell, the connection assembly is located at the upper part of the shell and close to the rear side, the control assembly is located at the upper part of the shell and close to the front side, the filter assembly is installed in the shell and arranged below the connection assembly, the capacitor assembly is installed in the shell and arranged below the control assembly, an opening is provided on the side of the shell, the opening covers the filter assembly and the capacitor assembly, the side plate is detachably connected to the shell and covers the opening, and the side plate is made of stainless steel or aluminum

[0007] The capacitor assembly includes a fixed shell, a partition is fixedly connected inside the shell, a control assembly and a connection assembly are arranged above the partition, and a clamping piece for fixing the fixed shell is detachably connected below the partition. A groove is also provided on the top of the fixed shell, the side of the clamping piece abuts against the side of the groove, and the contact surface between the clamping piece and the fixed shell is provided on the bottom of the groove.

[0008] In summary, the above technical solution has the following beneficial effects: under normal circumstances, the pressing member can increase the static friction between the fixed shell and the housing by applying pressure to the fixed shell, thereby achieving a better positioning effect; and under unconventional circumstances, usually the size of the fixed shell exceeds the maximum action range of the limit plate, in which case multiple pressing members can be used to press tightly, thereby achieving a positioning effect;

[0009] The contact surface between the pressing piece and the fixed shell is arranged at the bottom surface of the groove, so that the pressing piece can be easily positioned during installation, and the side surface of the pressing piece abuts against the side surface of the groove to prevent the fixed shell from sliding sideways;

[0010] Since the heating parts are mainly concentrated in the filter assembly, the filter assembly is the focus of heat dissipation. The filter assembly usually includes coils. These coils are large in number and close to each other, and the structure is complex, resulting in low air circulation rate and low heat dissipation efficiency. Therefore, the prior art uses the side hollowing method to increase the contact area of ​​gas heat exchange, but in actual use, it is found that the coil will cause the air temperature from the inside to the outside to rise at the same time, and the number of side hollowings of the shell is limited, so it cannot meet the heat dissipation requirements. The hot air is lighter than the cold air, so it will enter the upper connection assembly and the control assembly around, further causing the overall temperature of the capacitor to rise, affecting the safety of the entire device. At the same time, for the protection of the connection assembly and the control assembly, the opening is set to cover only the filter assembly and the capacitor assembly. Under normal circumstances, the anti-harmonic intelligent capacitor is not often in a high-voltage state. Therefore, in a non-high-voltage state, the heat dissipation demand is not so high, and there is no need to remove the side panel. In the high-voltage working state, only the side panel covering the filter assembly and the capacitor assembly can be removed, thereby ensuring safety while increasing the heat dissipation efficiency.

[0011] The capacitor assembly is mainly used to store electric energy and perform reactive power compensation. It usually adopts a progressively thickened silver-zinc plating process, which has good conductivity and stability. Therefore, the heat generated during operation is smaller and more uniform than that of the filter assembly, which greatly improves the capacity stability of the power capacitor under low voltage conditions. However, the capacitor assembly will still release a large amount of heat under high voltage conditions. Therefore, the same heat dissipation structure setting as the filter assembly 4 can be used, thereby reducing production costs;

[0012] The connection components are mainly used to connect various components and external access lines. The control components are mainly used to monitor the status of the power grid in real time and respond quickly to maintain the stability of the power system. They can also measure the voltage, current, power factor and other parameters of the power grid, switch capacitors to achieve reactive power compensation, and cut off the power supply in time when the capacitor has overload, short circuit and other faults to protect the safety of the capacitor and the power grid.

[0013] In addition, although the connection components and control components located at the top of the housing have a certain degree of heat accumulation risk, the connection components and control components themselves are relatively fragile, and from the perspective of the heat generated by the filter components and capacitor components, the upper part is usually mainly the connection components, and the heat generating components are located at the bottom. Therefore, it is still the best choice to place the connection components and control components at the top of the housing;

[0014] Normally, the shell is made of low-cost metals such as iron for cost considerations. However, it is found during use that the filter component usually adopts a structure in which multiple sets of coils are arranged in one direction. The side of the shell will produce resonance due to the influence of the multiple sets of coils. The back of the shell is not easy to resonate because the area affected by the coils is small. Therefore, the side panel is made of stainless steel or aluminum. These two materials can effectively avoid resonance. However, due to the high price of raw materials, the shell is not replaced with these two materials.

[0015] The prior art usually adopts a shell with a large number of ventilation holes to increase the speed of internal air circulation to dissipate heat. This passive heat dissipation method mainly relies on air convection inside and outside the shell. However, the heat dissipation demand of the anti-harmonic smart capacitor increases under high voltage state. Therefore, the utility model adopts a detachable side panel to increase the air convection area, and only the side panel covering the filter component can be removed, thereby ensuring safety while increasing heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural diagram of the anti-harmonic intelligent capacitor;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the housing and the side plate in the utility model;

[0018] Figure 3 It is a schematic diagram of the internal three-dimensional structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure when the limiting plate is installed in the utility model.

[0020] Reference numerals: 1, housing; 2, side plate; 3, capacitor assembly; 4, filter assembly; 5, connection assembly; 6, control assembly;

[0021] 11. opening; 12. second plug plate; 13. partition plate; 14. pressing piece; 15. limit plate; 16. heat insulation plate; 17. strip hole;

[0022] 21. first plugboard; 22. mesh;

[0023] 31. Fixed shell; 32. Groove. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0025] Reference Figure 1-4 As shown, the anti-harmonic intelligent capacitor includes a housing 1, a side plate 2, a capacitor component 3, a filter component 4, a connection component 5 and a control component 6. The connection component 5 and the control component 6 are both installed on the surface of the housing 1, the connection component 5 is located in the upper part of the housing 1 and close to the rear side, the control component 6 is located in the upper part of the housing 1 and close to the front side, the filter component 4 is installed in the housing 1 and arranged below the connection component 5, the capacitor component 3 is installed in the housing 1 and arranged below the control component 6, an opening 11 is provided on the side of the housing 1, the opening 11 covers the filter component 4, the side plate 2 is detachably connected to the housing 1 and covers the opening 11, and the side plate 2 is made of stainless steel or aluminum;

[0026] The capacitor assembly 3 includes a fixed shell 31, a partition 13 is fixedly connected in the shell 1, the control assembly 6 and the connection assembly 5 are arranged above the partition 13, and a pressing piece 14 for fixing the fixed shell 31 is detachably connected below the partition 13. A groove 32 is also provided on the top of the fixed shell 31, and the side of the pressing piece 14 abuts against the side of the groove 32. The contact surface between the pressing piece 14 and the fixed shell 31 is provided on the bottom surface of the groove 32;

[0027] Under normal circumstances, the pressing member 14 can increase the static friction between the fixed shell 31 and the housing 1 by applying pressure to the fixed shell 31, thereby achieving a better positioning effect. In unconventional circumstances, the size of the fixed shell 31 usually exceeds the maximum action range of the limiting plate 15. In this case, multiple pressing members 14 can be used to press tightly to achieve a positioning effect.

[0028] The contact surface between the pressing piece 14 and the fixed shell 31 is arranged at the bottom surface of the groove 32, so that the pressing piece 14 can be easily positioned during installation, and the side surface of the pressing piece 14 abuts against the side surface of the groove 32 to prevent the fixed shell 31 from sliding sideways;

[0029] Since the heating part is mainly concentrated in the filter component 4, the filter component 4 is the focus of heat dissipation. The filter component 4 usually includes coils. The number of these coils is large and close to each other, and the structure is complex, resulting in low air circulation rate and low heat dissipation efficiency. Therefore, the prior art uses the side hollowing method to increase the contact area of ​​gas heat exchange. However, in actual use, it is found that the coil will cause the air temperature from the inside to the outside to rise at the same time, and the number of side hollowings of the shell 1 is limited, so it cannot meet the heat dissipation requirements. The hot air is lighter than the cold air, so it will enter the upper connection component 5 and the control component 6 around, further causing the overall temperature of the capacitor to rise, affecting the safety of the entire device. At the same time, for the consideration of protecting the connection component 5 and the control component 6, the opening 11 is set to only cover the filter component 4 and the capacitor component 3. Under normal circumstances, the anti-harmonic intelligent capacitor is not often in a high-voltage state. Therefore, in a non-high-voltage state, the heat dissipation demand is not so high, and there is no need to remove the side plate 2. In the high-voltage working state, only the side plate 2 covering the filter component 4 and the capacitor component 3 can be removed, thereby ensuring safety while increasing the heat dissipation efficiency;

[0030] The capacitor component 3 is mainly used for storing electric energy and performing reactive power compensation. It usually adopts a progressively thickened silver-zinc plating process, which has good conductivity and stability. Therefore, the heat generated during operation is smaller and more uniform than that of the filter component 4, which greatly improves the capacity stability of the power capacitor under low voltage. Therefore, the same heat dissipation structure setting as that of the filter component 4 can be used, thereby reducing production costs;

[0031] The connection component 5 is mainly used to connect various components and external access lines. The control component 6 is mainly used to monitor the power grid status in real time and respond quickly to maintain the stability of the power system. It can also measure the voltage, current, power factor and other parameters of the power grid, switch capacitors to achieve reactive power compensation, and cut off the power supply in time when the capacitor has overload, short circuit and other faults to protect the safety of the capacitor and the power grid.

[0032] In addition, although the connection component 5 and the control component 6 disposed at the top of the housing 1 have a certain degree of heat accumulation risk, the connection component 5 and the control component 6 are relatively fragile, and from the heat generation of the filter component 4 and the capacitor component 3, the upper part is usually mainly the connection component, and the heating component is at the bottom, so it is still the best choice to dispose the connection component 5 and the control component 6 at the top of the housing 1;

[0033] Normally, the housing is made of low-cost metals such as iron for cost considerations. However, it is found during use that the filter assembly 4 usually adopts a structure in which multiple sets of coils are arranged in one direction. The side of the housing 1 will produce resonance due to the influence of the multiple sets of coils. The back of the housing 1 is less affected by the coils and is not prone to resonance. Therefore, the side plate 2 is made of stainless steel or aluminum. These two materials can effectively avoid resonance. However, due to the high price of raw materials, the housing is not replaced with these two materials.

[0034] The prior art usually adopts a shell 1 with a large number of ventilation holes to increase the speed of internal air circulation to dissipate heat. This passive heat dissipation method mainly relies on air convection inside and outside the shell 1. However, the heat dissipation demand of the anti-harmonic smart capacitor increases under high voltage state. Therefore, the utility model adopts a detachable side panel 2 to increase the air convection area, and only the side panel 2 covering the filter component 4 can be removed, thereby ensuring safety while increasing heat dissipation efficiency.

[0035] Furthermore, a first plug plate 21 for contacting the housing 1 is fixedly connected to the upper side plate 2, and a second plug plate 12 for contacting the side plate 2 is fixedly connected to the housing 1;

[0036] The abutment between the first plug plate 21 and the second plug plate 12 can fix the relative position of the side plate 2 and the housing 1 , thereby preventing the side plate 2 from separating from the housing 1 due to thermal expansion.

[0037] Furthermore, the side plate 2 is provided with a mesh 22;

[0038] The mesh 22 can provide more gas exchange windows when the side plate 2 is installed on the housing 1 .

[0039] Furthermore, two limiting plates 15 for fixing the fixed shell 31 are detachably connected to the bottom of the housing 1, and the limiting plates 15 are bent toward the other limiting plates 15;

[0040] The capacitor assembly 3 is usually formed as a complete component in the form of a component set in a fixed shell 31. The two limiting plates 15 cooperate to limit the movement of the fixed shell 31. At the same time, the fixed shell 31 is usually in a cubic shape with rounded edges, so the limiting plate 15 also needs to be bent toward the other limiting plate 15 to better fit the fixed shell 31.

[0041] In addition, capacitor assemblies 3 of different specifications have fixed shells 31 of different sizes, so the limiting plate 15 is detachable to facilitate replacement of a more suitable limiting plate 15 .

[0042] Furthermore, the side panel 2 is bent toward one end of the back side of the housing 1, and the bent portion of the side panel 2 is connected to the back side of the housing 1 by screws;

[0043] Since the side panel 2 is a detachable component relative to the shell 1, it cannot be made in an integrated manner. At the same time, after the side panel 2 is removed, the area of ​​the opening 11 needs to be increased as much as possible. Therefore, the side panel 2 is bent toward the back of the shell 1, so that the connecting part is transferred to the back of the shell 1, thereby increasing the area used for heat exchange as much as possible.

[0044] Furthermore, the housing 1 is also fixedly connected with a heat insulation board 16 disposed between the capacitor component 3 and the filter component 4;

[0045] Since the heat release rate of the filter component 4 is much faster than that of the capacitor component 3 , in order to prevent the filter component 4 from having an impact on the capacitor component 3 , a heat insulation board 16 is provided to perform local heat insulation in a short period of time.

[0046] Furthermore, the housing 1 is provided with strip holes 17 , which can also increase the heat dissipation efficiency.

[0047] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. Anti-harmonic intelligent capacitor, characterized by: The invention comprises a housing, a side plate, a capacitor assembly, a filter assembly, a connection assembly and a control assembly, wherein the connection assembly and the control assembly are both mounted on the housing surface, the connection assembly is located in the upper part of the housing and close to the rear side, the control assembly is located in the upper part of the housing and close to the front side, the filter assembly is mounted in the housing and arranged below the connection assembly, the capacitor assembly is mounted in the housing and arranged below the control assembly, an opening is arranged on the side of the housing, the opening covers the filter assembly, the side plate is detachably connected to the housing and covers the opening, and the side plate is made of stainless steel or aluminum; The capacitor assembly includes a fixed shell, a partition is fixedly connected inside the shell, the control assembly and the connection assembly are arranged above the partition, and a clamping piece for fixing the fixed shell is detachably connected below the partition. A groove is also provided on the top of the fixed shell, and the side surface of the clamping piece abuts against the side surface of the groove, and the contact surface between the clamping piece and the fixed shell is arranged on the bottom surface of the groove.

2. The anti-harmonic smart capacitor according to claim 1, characterized in that: A first plugging plate for contacting the shell is fixedly connected above the side plate, and a second plugging plate for contacting the side plate is fixedly connected to the shell.

3. The anti-harmonic smart capacitor according to claim 1, characterized in that: The side plates are provided with mesh holes.

4. The anti-harmonic smart capacitor according to claim 1, characterized in that: The bottom of the shell body is detachably connected to two limiting plates for fixing the fixed shell, and the limiting plate is bent toward the other limiting plate.

5. The anti-harmonic smart capacitor according to claim 1, characterized in that: The side plate is bent toward one end of the back side of the shell, and the bent portion of the side plate is connected to the back side of the shell through screws.

6. The anti-harmonic smart capacitor according to claim 1, characterized in that: The shell is also fixedly connected with a heat insulation board arranged between the capacitor component and the filter component.

7. The anti-harmonic smart capacitor according to claim 1, characterized in that: The shell is also provided with a strip hole.

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