阅读说明：本技术 干式电热电容器 (Dry type electric heating capacitor ) 是由 孔祥路 于 2021-01-22 设计创作，主要内容包括：本发明涉及一种干式电热电容器,其包括电容芯子、电极端子和壳体,电容芯子设置在壳体内,电极端子设置在壳体外,电容芯子与电极端子电性连接,所述电容芯子为干式电容芯子,壳体内部还设有水路,水路与干式电容芯子之间通过导热介质绝缘隔开,水路与电极端子的内端绝缘隔开。本发明利用水的高比热容、冷却水与发热芯子更大接触面积从而稳定电容器的正常工作,使得在同样电流强度下,芯子温度上升10-20℃,芯子表面温度仅为40-50℃,有效的提高电容器的使用寿命和降低工作能耗。(The invention relates to a dry type electric heating capacitor, which comprises a capacitor core, an electrode terminal and a shell, wherein the capacitor core is arranged in the shell, the electrode terminal is arranged outside the shell, the capacitor core is electrically connected with the electrode terminal, the capacitor core is a dry type capacitor core, a water path is also arranged in the shell, the water path is insulated and separated from the dry type capacitor core through a heat-conducting medium, and the water path is insulated and separated from the inner end of the electrode terminal. The invention utilizes the high specific heat capacity of water and the larger contact area of cooling water and the heating core to stabilize the normal work of the capacitor, so that the temperature of the core rises by 10-20 ℃ and the surface temperature of the core is only 40-50 ℃ under the same current intensity, thereby effectively prolonging the service life of the capacitor and reducing the working energy consumption.)

1. The utility model provides a dry-type electric heating capacitor, includes electric capacity core, electrode terminal (5) and casing, and the electric capacity core sets up in the casing, and electrode terminal (5) set up outside the casing, electric capacity core and electrode terminal (5) electric connection, its characterized in that: the capacitor core is a dry capacitor core (2), a water path is arranged in the shell, the water path and the dry capacitor core (2) are insulated and separated through a heat-conducting medium, and the water path and the inner end of the electrode terminal (5) are insulated and separated.

2. A dry electrothermal capacitor according to claim 1, wherein: the shell comprises a shell body (1), a bottom plate (8) and an insulating cover plate (4), wherein the shell body (1) is cylindrical, the insulating cover plate (4) and the bottom plate (8) are respectively arranged at the upper end and the lower end of the shell body (1), and the electrode terminal (5) is arranged on the insulating cover plate (4).

3. A dry electrothermal capacitor according to claim 2, wherein: an inner sleeve (7) is arranged in the shell, a core cavity (71) is formed in the inner side of the inner sleeve (7), and the capacitor core is encapsulated in the core cavity (71) through a heat conduction material.

4. A dry electrothermal capacitor according to claim 3, wherein: the inner sleeve (7) and the shell body (1) are arranged in a split mode, or the inner sleeve (7) and the shell body (1) are integrally formed; the inner sleeve (7) is cylindrical or groove-shaped, and when the inner sleeve (7) is groove-shaped, the notch of the inner sleeve is close to the inner wall of the shell body (1) to enclose a core cavity (71) with a closed periphery.

5. A dry electrothermal capacitor according to claim 3, wherein: an inner cavity (15) is formed between the inner wall of the shell and the outer wall of the inner sleeve (7), the inner cavity (15) forms the water path, a partition plate (11) is arranged at the top of the inner cavity (15), a separation cavity (16) is formed between the partition plate (11) and the insulating cover plate (4), and an insulating material sealing layer is encapsulated in the separation cavity (16); the shell is provided with a water inlet pipe (61) and a water outlet pipe (62), and the inner ends of the water inlet pipe (61) and the water outlet pipe (62) are communicated with the inner cavity (15).

6. A dry electrothermal capacitor according to claim 5, wherein: the separate cavity (16) is communicated with the core cavity (71) of the inner sleeve (7).

7. A dry electrothermal capacitor according to claim 5, wherein: the inner wall of the separate cavity (16) is provided with a groove (17).

8. A dry electrothermal capacitor according to claim 1, wherein: the capacitor cores are more than one group, and each group of capacitor cores comprises more than two dry capacitor cores (2) which are connected through enameled wire winding displacement; the enameled wire winding displacement (3) comprises a plurality of enameled wires (31) which are arranged side by side, the end parts of the enameled wires (31) are welded on the copper sheets (32), and the enameled wire winding displacement (3) is electrically connected with the dry-type capacitor core (2) and the inner ends of the electrode terminals (5) through the copper sheets (32); or the two ends of the enameled wire (31) are respectively and directly electrically connected with the dry capacitor core (2) and the inner end of the electrode terminal (5).

9. A dry electrothermal capacitor according to claim 2, wherein: the bottom of the shell body (1) is matched with the bottom plate (8) through a zigzag surface; the outer side gap of the matching part of the shell body (1) and the bottom plate (8) is subjected to laser welding, and the inner side of the matching part of the shell body (1) and the bottom plate (8) is subjected to gluing and sealing treatment.

Technical Field

The invention relates to an electrothermal capacitor, in particular to a dry type electrothermal capacitor.

Background

At present, the electrothermal capacitor on the market generally adopts an insulating oil foil type structure, one or more cooling water pipes penetrate through the interior of the capacitor to realize cooling, and the surface temperature of a capacitor core can reach 60-80 ℃ under the current intensity of 0.005A/mm. On the other hand, because of adopting oily formula structure, the condenser generates heat and leads to insulating oil volume expansion in the course of the work, has higher risk of revealing, has certain probability to the outside eruption of condenser and causes the damage of other components and parts. On the other hand, the loose shock resistance between the oil type capacitor core layers is poor, and the micro-vibration of the dielectric medium in the working process directly influences the service life and the electrical performance of the oil type capacitor core layers.

In addition, the existing electrothermal capacitor shell is mainly welded by argon arc welding, has certain requirements on the thickness of materials, can not process the materials with the thickness of less than 1.0mm, is difficult to ensure the qualification rate when processing the materials with the thickness of less than 1.0mm, is easy to generate poor phenomena such as welding penetration, sand holes and the like, and is not in line with the light-weight market direction. In addition, the welding speed is slow, and the labor cost is increased.

In addition, capacitor products in the market generally mainly adopt thin red copper sheets as connecting materials, and in the working process of the electric heating capacitor, the current is large, the electric heating capacitor is often connected in a mode of stacking multiple layers of red copper sheets, so that the skin effect is easy to occur, and the good effect cannot be achieved.

Disclosure of Invention

The invention aims to provide a dry type electric heating capacitor which is reasonable in structure, water-cooled, safe, reliable, long in service life and more suitable for energy conservation and emission reduction.

The purpose of the invention is realized as follows:

the utility model provides a dry-type electric heating capacitor, includes electric capacity core, electrode terminal and casing, and electric capacity core sets up in the casing, and electrode terminal sets up outside the casing, electric capacity core and electrode terminal electric connection, its characterized in that: the capacitor core is a dry capacitor core, a water path is arranged in the shell, the water path and the dry capacitor core are insulated and separated through a heat-conducting medium, and the water path and the inner end of the electrode terminal are insulated and separated.

The aim of the invention can also be solved by the following technical measures:

more specifically, the housing includes a cylindrical housing body, a bottom plate, and an insulating cover plate, the insulating cover plate and the bottom plate are respectively disposed at upper and lower ends of the housing body, and the electrode terminal is disposed on the insulating cover plate.

As a further scheme, an inner sleeve is arranged in the shell, a core cavity is formed in the inner side of the inner sleeve, and the capacitor core is encapsulated in the core cavity through a heat conduction material. The heat conduction material is an epoxy material layer, a polyurethane layer or a modified resin layer (the modified resin layer is formed by mixing and injecting resin materials and microcrystalline paraffin).

As a further scheme, the inner sleeve and the shell body are separately arranged, or the inner sleeve and the shell body are integrally formed (for example, the inner sleeve and the shell body are extruded and formed by aluminum materials or copper materials, or are integrally welded); the inner sleeve is cylindrical or groove-shaped, and when the inner sleeve is groove-shaped, the notch of the inner sleeve is close to the inner wall of the shell body to enclose a core cavity with a closed periphery.

As a further scheme, an inner cavity is formed between the inner wall of the shell and the outer wall of the inner sleeve, the inner cavity forms the water path, a partition plate is arranged at the top of the inner cavity, a separation cavity is formed between the partition plate and the insulating cover plate, and an insulating material sealing layer is encapsulated in the separation cavity; the shell is provided with a water inlet pipe and a water outlet pipe, and the inner ends of the water inlet pipe and the water outlet pipe are communicated with the inner cavity. The partition board, the separation cavity and the insulating material sealing layer are used for separating the electrode terminal from an inner cavity, the inner cavity of the structure is fully water-cooled, and water and electricity separation must be achieved.

As a further scheme, the separation cavity is communicated with the core cavity of the inner sleeve. Thus, the core cavity is encapsulated at the same time as the encapsulation of the insulation seal.

As a further scheme, the inner wall of the separate cavity is provided with a groove, so that the insulating material sealing layer is clamped with the groove and is not easy to separate.

As a further scheme, more than one group of capacitor cores is arranged, and each group of capacitor cores comprises more than two dry capacitor cores which are connected through enameled wire winding displacement; the enameled wire winding displacement comprises a plurality of enameled wires which are arranged side by side, the end parts of the enameled wires are welded on a copper sheet, and the enameled wire winding displacement is electrically connected with the dry-type capacitor core and the inner ends of the electrode terminals through the copper sheet; or the two ends of the enameled wire are respectively and directly electrically connected with the dry capacitor core and the inner end of the electrode terminal. Generally, capacitor products on the market mainly adopt thin red copper sheets as connecting materials, and through test data, the heat productivity of the red copper sheets with the same cross section area is about 2-3 times that of enameled wires in the working process of the electrothermal capacitor. From the perspective of energy conservation and emission reduction, the enameled wire form connection is more suitable.

As a further scheme, the bottom of the shell body is matched with the bottom plate through a zigzag surface; and the outer side gap of the matching part of the shell body and the bottom plate is subjected to laser welding, and the inner side of the matching part of the shell body and the bottom plate is subjected to gluing and sealing treatment. By adopting the mode, the sealing performance can be improved, the material thickness of the shell body, the bottom plate, the inner sleeve and other parts can be reduced to be less than 1.0mm, and the light-weight market demand is met.

The invention has the following beneficial effects:

(1) the invention utilizes the high specific heat capacity of water and the larger contact area of cooling water and the heating core to stabilize the normal work of the capacitor, so that the temperature of the core rises by 10-20 ℃ and the surface temperature of the core is only 40-50 ℃ under the same current intensity, thereby effectively prolonging the service life of the capacitor and reducing the working energy consumption.

(2) The capacitor adopts a dry structure, has a thermal expansion coefficient far lower than that of insulating oil, and is not easy to have leakage risk. Meanwhile, the capacitor core can be effectively wrapped by the potting material with the dry structure, so that the micro-vibration of the dielectric medium in the working process is reduced, the service life is prolonged, and the stability of other electrical properties is improved.

(3) The invention adopts high-insulation materials to ensure the thin-wall insulation strength between the core and the inner container and simultaneously improve the heat dissipation efficiency of the product.

(4) The invention adopts an internal and external cavity structure, separates the contact of cooling water and an electrode, is different from the conventional electric heating capacitor product, does not need to distinguish two electrodes for water supply, namely does not need to prepare two sets of cooling water devices.

(5) The cooling water of the invention is also in direct contact with the shell, and simultaneously reduces the temperature of the shell and the heat radiation and heat conduction to other components.

Drawings

Fig. 1 is an exploded view of the first embodiment of the present invention.

Fig. 2 is a perspective view of the assembled first embodiment of the present invention.

Fig. 3 is a perspective structural diagram of a first embodiment of the present invention in a front view state.

Fig. 4 is a perspective structural diagram of the first embodiment of the invention in a side view.

Fig. 5 is a schematic structural view of a first embodiment of the present invention showing a connection manner between the housing and the bottom plate.

Fig. 6 is a schematic structural view of another connection mode of the housing and the bottom plate according to the first embodiment of the present invention.

FIG. 7 is a schematic view of the enameled wire arrangement structure of the present invention.

Fig. 8 is a schematic structural view of another embodiment of the inner sleeve and the shell of the present invention.

Fig. 9 is a schematic structural view of another embodiment of the inner sleeve and the shell of the present invention.

Fig. 10 is an exploded view (not shown) of the flat cable according to the second embodiment of the present invention.

Fig. 11 is a perspective view (not shown) of the assembled structure of the second embodiment of the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples.

In a first embodiment, referring to fig. 1 to 4, a dry type electric heating capacitor includes a capacitor core, an electrode terminal 5 and a housing, the capacitor core is disposed in the housing, the electrode terminal 5 is disposed outside the housing, the capacitor core is electrically connected to the electrode terminal 5, the capacitor core is a dry type capacitor core 2, a water path is further disposed inside the housing, the water path is insulated and separated from the dry type capacitor core 2 by a heat conducting medium, and the water path is insulated and separated from an inner end of the electrode terminal 5.

The shell comprises a shell body 1, a bottom plate 8 and an insulating cover plate 4, wherein the shell body 1 is cylindrical, the insulating cover plate 4 and the bottom plate 8 are respectively arranged at the upper end and the lower end of the shell body 1, and the electrode terminal 5 is arranged on the insulating cover plate 4. The left side and the right side of the shell body 1 are provided with mounting frames 14.

An inner sleeve 7 is arranged in the shell, a core cavity 71 is arranged on the inner side of the inner sleeve 7, and the capacitor core is encapsulated in the core cavity 71 through a heat conduction material.

The inner sleeve 7 and the shell body 1 are arranged in a split mode. The bottom of the inner sleeve 7 is also sealed by an inner sealing plate 72. The inner sleeve 7 is cylindrical.

An inner cavity 15 is formed between the inner wall of the shell and the outer wall of the inner sleeve 7, the inner cavity 15 forms the water path, a partition plate 11 is arranged at the top of the inner cavity 15, a separation cavity 16 is formed between the partition plate 11 and the insulating cover plate 4, and an insulating material sealing layer is encapsulated in the separation cavity 16; the shell is provided with a water inlet pipe 61 and a water outlet pipe 62, and the inner ends of the water inlet pipe 61 and the water outlet pipe 62 are communicated with the inner cavity 15. And the surface of the insulating cover plate 4 is provided with a pouring hole 41. The partition board 11 is provided with a yielding hole 13 corresponding to the water inlet pipe 61 and the water outlet pipe 62. The lower extreme of inlet tube 61 is close to the bottom of inner chamber 15, and the lower extreme of outlet pipe 62 is close to the top of inner chamber 15, and the heat transfer effect is better like this.

The compartment 16 communicates with the core chamber 71 of the inner sleeve 7. The partition 11 is provided with an opening 12 corresponding to the upper end of the inner sleeve 7, and the opening 12 is communicated with the separation cavity 16 and the core cavity 71.

The inner wall of said compartment 16 is provided with an annular groove 17.

The capacitor core is provided with six groups, and each group of capacitor cores comprises two dry capacitor cores 2 connected through enameled wire winding displacement. Referring to fig. 7, the enamel wire arrangement 3 includes a plurality of enamel wires 31 disposed side by side, an end of each enamel wire 31 is welded to a copper sheet 32, and the enamel wire arrangement 3 is electrically connected to the dry capacitor core 2 and the inner ends of the electrode terminals 5 through the copper sheet 32. When the enameled wire is drawn too long (more than 200 mm), a plastic binding belt is adopted for primary fixation, and finally epoxy is encapsulated to ensure that the position of the enameled wire is completely fixed (the arrangement is tidy relative to the structure without forced restraint).

The bottom of the shell body 1 is matched with the bottom plate 8 through a zigzag surface; the outer side gap of the matching part of the shell body 1 and the bottom plate 8 is subjected to laser welding, and the inner side of the matching part of the shell body 1 and the bottom plate 8 is subjected to gluing and sealing treatment. As shown in fig. 5, the bottom of the casing 1 is placed on the edge of the bottom plate 8, and the edge of the bottom plate 8 is provided with a step surface 81 to form a curved surface with the bottom of the casing 1. Referring to fig. 6, the bottom of the housing 1 is placed on the edge of the bottom plate 8, and the top surface of the bottom plate 8 near the edge is provided with an annular groove 82 to form a curved surface with the bottom of the housing 1. The step surface 81 and the annular groove 82 are engraved.

The housing body 1 and the inner sleeve 7 can be replaced together by a profile structure as shown in fig. 8 and 9. Fig. 8 and 9 show profiles in which the inner sleeve 7 is formed integrally with the housing body 1.

The inner cavity 15 is filled with water for cooling, and the water can circulate through the water inlet pipe 61 and the water outlet pipe 62.

The second embodiment is different from the first embodiment in that: referring to fig. 10 and 11, the inner sleeve 7 is groove-shaped, and when the inner sleeve 7 is groove-shaped, its notch is closed to the inner wall of the housing 1 to form a core cavity 71 with a closed periphery. The lower end of the inner sleeve 7 can be directly matched with the bottom plate. In addition, the number of the dry capacitor cores 2 in the embodiment may be different from that in the first embodiment.

In the two embodiments, the potting material may be an epoxy layer, a polyurethane layer, a modified resin layer (a modified resin layer formed by mixing and injection molding a resin material and microcrystalline paraffin), and the like; the potting material can be filled to a required position by adopting a pouring and injection molding mode. The shell structure with the same function and the same material change also fall into the protection scope of the invention.