Vacuum contactor with water cooling mechanism

Abstract

The invention belongs to the technical field of vacuum contactors, and particularly relates to a vacuum contactor with a water cooling mechanism, which comprises a cooling structure, the cooling structure comprises a shell formed by mutually matching, combining and splicing a first shell and a second shell, and the shell is sleeved outside a ceramic body at a contact part of a vacuum arc extinguish chamber of a contactor body. And a cooling cavity formed between the inner wall of the shell and the upper outer wall of the ceramic body at the contact part of the vacuum arc-extinguishing chamber is divided into a spiral cooling cavity by a spiral partition plate. According to the invention, a wrapping shell is formed outside the ceramic body at the contact part of the contactor by using the two combined shells, and a spiral cooling cavity for injecting the cooling liquid is formed between the shell and the ceramic body, so that heat exchange and cooling are performed after the cooling liquid is injected, and the temperature at the contact part is rapidly reduced; and meanwhile, cooling liquid cooling can be carried out by adopting two modes of cooling liquid soaking and atomization spraying, so that stable and effective cooling is realized, and long-time stable operation and use of the contactor are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum contactors, in particular to a vacuum contactor with a water cooling mechanism. Background Art

[0002] The vacuum contactor uses a vacuum interrupter to extinguish arcs, which is used to frequently connect and disconnect normal working currents. It is usually used to connect and disconnect medium and low voltage 6kV, 380V, AC motors that are frequently started and stopped over a long distance. The vacuum contactor is mainly composed of a vacuum interrupter and an operating mechanism. The vacuum interrupter has two functions: reliable arc extinguishing when passing normal working current and frequently cutting off working current, but it cannot cut off overload current and short-circuit current. The operating mechanism is composed of a holding coil with an iron core and an armature. When the coil is energized, the armature is attracted and the contactor is closed; when the coil is de-energized, the contactor is disconnected. The holding coil generally has two forms: DC and AC.

[0003] The vacuum contactor is generally installed in the ring main unit. When the temperature of the vacuum contactor is high, it is necessary to dissipate heat from the vacuum contactor, especially at the contact part, where a large amount of heat energy will be generated, and the heat will be transferred to the ceramic body outside the contact. Most of the existing technologies use air cooling to dissipate heat, but when the overall temperature in the ring main unit is high, the air drawn from the ring main unit by the cooling fan is still hot air, which cannot achieve the purpose of dissipating heat from the vacuum contactor. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a vacuum contactor with a water cooling mechanism, which solves the problem that most of the current methods of heat dissipation are air cooling. When the overall temperature in the ring network cabinet is high, the air drawn from the ring network cabinet by the cooling fan is still hot air, which cannot achieve the purpose of heat dissipation of the vacuum contactor.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A vacuum contactor with a water-cooling mechanism comprises a cooling structure, wherein the cooling structure comprises an outer shell formed by a first shell and a second shell which cooperate with each other and are assembled and spliced ​​together, the outer shell being mounted on the outside of a ceramic body at a contact position of a vacuum arc extinguishing chamber of a contactor body, a cooling cavity formed between an inner wall of the outer shell and an outer wall of the ceramic body at a contact position of the vacuum arc extinguishing chamber being divided into a spiral cooling cavity by a spiral partition, and a spiral coil connected to an injection pipe passes through the second shell and extends into the spiral cooling cavity, an upper end of an outer discharge pipe is connected to the cooling cavity formed inside the outer shell, and a one-way air inlet valve is installed in a through hole opened at the bottom of the outer shell.

[0006] Furthermore, the first bolt seat integrally provided on the first shell is fixedly connected to the second bolt seat integrally provided on the second shell by bolts, and a sealing gasket is arranged at the contact portion where the first shell and the second shell are spliced ​​with each other; The upper and lower ends of the shell composed of the first shell and the second shell are both provided with sealing rings, and the sealing rings are embedded in the first limiting groove opened at the corresponding position on the first shell and the second limiting groove opened at the corresponding position on the second shell; The first through hole opened at the bottom end of the first shell and the second through hole opened at the bottom end of the second shell form a through hole for installing a one-way air intake valve at the bottom end of the combined shell, and the first through hole and the second through hole are both arranged in coordination with the one-way air intake valve, and a sealing sleeve is arranged at the connection between the one-way air intake valve and the first through hole and the second through hole.

[0007] Furthermore, the spiral partition is composed of a first arc plate on the inner wall of the first shell and a second arc plate on the inner wall of the second shell, the first arc plate and the second arc plate have the same spiral angle, and the inner circle edge of the spiral partition abuts against the outer wall of the ceramic body of the contactor body.

[0008] Furthermore, one end of the injection pipe passes through the pipe sleeve integrally provided on the second shell and extends into the internal cooling cavity and is communicated with one end of the spiral coil, and a second solenoid valve is installed at the other end of the spiral coil; The spiral coil is provided with atomizing nozzles distributed at equal intervals on one side facing the contactor body, and the injection pipe is fixedly connected to the outer wall of the second shell through a pipe bracket, and one end of the injection pipe located outside the shell is connected to the external coolant delivery pipeline.

[0009] Furthermore, one end of the outer pipe is connected to the discharge port opened at the corresponding position of the upper end of the first shell, and the connecting branch pipe connected to the through hole opened at the corresponding position of the lower end of the first shell is connected to the outer pipe, and a first solenoid valve is installed on the connecting branch pipe; One end of the outer pipe located outside the shell is connected to the return pipe and the air pipe respectively through a three-way adapter, and electric valves are installed at the connection parts of the return pipe and the air pipe with the three-way adapter.

[0010] Compared with the prior art, the present invention provides a vacuum contactor with a water cooling mechanism, which has the following beneficial effects: The present invention utilizes two combined shells to form a wrapping shell outside the ceramic body at the contact part of the contactor, and forms a spiral cooling cavity for injecting coolant between the shell and the ceramic body. After the coolant is injected, heat exchange and cooling are carried out to quickly reduce the temperature at the contact part. At the same time, two methods of coolant immersion and atomization spraying can be used to cool the coolant, so as to achieve stable and effective cooling, thereby ensuring long-term stable operation and use of the contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention; Figure 2It is a structural schematic diagram of the cooling structure in the present invention; Figure 3 is a cross-sectional view of the cooling structure in the present invention; Figure 4 It is a structural schematic diagram of the injection pipe in the present invention; Figure 5 It is a structural schematic diagram of the first shell in the present invention; Figure 6 It is a schematic structural diagram of the second shell in the present invention.

[0012] In the figure: 1. contactor body; 2. cooling structure; 201. first shell; 2011. first bolt seat; 2012. first arc plate; 2013. discharge port; 2014. first through hole; 2015. first limiting groove; 202. second shell; 2021. second bolt seat; 2022. second arc plate; 2023. pipe sleeve; 2024. second through hole; 2025. second limiting groove; 203. external discharge pipe; 2031. connecting branch pipe; 2032. first solenoid valve; 204. injection pipe; 2041. spiral coil; 2042. second solenoid valve; 205. sealing ring; 206. spiral partition; 207. one-way air inlet valve; 208. pipe support. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0014] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, an embodiment of the present invention proposes: a vacuum contactor with a water-cooling mechanism, including a cooling structure 2, the cooling structure 2 includes a shell formed by a first shell 201 and a second shell 202 that cooperate with each other and are assembled and spliced ​​together, the shell is mounted on the outside of the ceramic body at the contact position of the vacuum arc extinguishing chamber of the contactor body 1, and the cooling cavity formed between the inner wall of the shell and the upper outer wall of the ceramic body at the contact position of the vacuum arc extinguishing chamber is divided into a spiral cooling cavity by a spiral partition 206, and the two shells are combined together to form a spiral cooling cavity for injecting coolant on the outside of the ceramic body. When cooling is required, the coolant is smoothly injected into the spiral cooling cavity and discharged after heat exchange with the ceramic body, thereby achieving To achieve the purpose of cooling, the spiral coil 2041 connected to the injection pipe 204 passes through the second shell 202 and extends into the spiral cooling cavity, which is convenient for smoothly injecting the coolant into the cooling cavity, and cooling is performed by contact heat exchange. The upper end of the outer discharge pipe 203 is connected to the cooling cavity formed inside the shell, so that the coolant after heat exchange can be discharged smoothly, so that new coolant can continue to smoothly enter the cooling cavity, and achieve the purpose of long-term cooling of the coolant, and a one-way air intake valve 207 is installed in the through hole opened at the bottom of the shell, which is convenient for introducing outside air into the cavity to balance the air pressure after the air pressure in the cooling liquid cavity changes, thereby ensuring smooth cooling.

[0015] like Figure 2 , Figure 3 and Figure 6 As shown, in some embodiments, a first bolt seat 2011 integrally provided on the first housing 201 is fixedly connected to a second bolt seat 2021 integrally provided on the second housing 202 by bolts, and a sealing gasket is arranged at the contact portion where the first housing 201 and the second housing 202 are spliced ​​with each other, so as to stably connect the two together to form a stable housing, and at the same time, the sealing gasket is used to seal the connection portion between the two to ensure stable use; The upper and lower ends of the outer shell composed of the first shell 201 and the second shell 202 are both provided with sealing rings 205, and the sealing rings 205 are embedded in the first limiting grooves 2015 opened at the corresponding positions on the first shell 201 and the second limiting grooves 2025 opened at the corresponding positions on the second shell 202, so that the sealing rings 205 are stably installed at the upper and lower ends of the outer shell, and the gaps between the upper and lower ends of the outer shell and the ceramic body are blocked, so as to ensure the formation of a closed cooling cavity, and effectively guarantee the injection of the coolant; The first through hole 2014 opened at the bottom end of the first shell 201 and the second through hole 2024 opened at the bottom end of the second shell 202 form a through hole for installing the one-way air intake valve 207 at the bottom end of the combined shell, and the first through hole 2014 and the second through hole 2024 are both arranged in conjunction with the one-way air intake valve 207, and a sealing sleeve is arranged at the connection between the one-way air intake valve 207 and the first through hole 2014 and the second through hole 2024, so as to facilitate the stable installation of the one-way air intake valve 207 on the shell and seal the gap between the two, and after the air pressure in the cooling cavity changes, the outside air is promptly introduced into the cooling cavity to balance the air pressure in the cooling cavity and ensure the smooth cooling process.

[0016] like Figure 2 and Figure 3 As shown, in some embodiments, the spiral partition 206 is composed of a first arc plate 2012 on the inner wall of the first shell 201 and a second arc plate 2022 on the inner wall of the second shell 202, the first arc plate 2012 and the second arc plate 2022 have the same spiral angle, and the inner circle edge of the spiral partition 206 is in contact with the outer wall of the ceramic body of the contactor body 1. When the first shell 201 and the second shell 202 are spliced ​​together, the first arc plate 2012 and the second arc plate 2022 are spliced ​​and combined together to form a spiral partition 206 that separates the cooling cavity, thereby forming a stable spiral cooling cavity, so that the coolant can effectively contact the ceramic body at the contact position, perform stable and effective heat exchange, and achieve cooling of the ceramic body at the contact position.

[0017] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, one end of the injection pipe 204 passes through the pipe sleeve 2023 integrally provided on the second shell 202 and extends into the internal cooling cavity, and is connected with one end of the spiral coil 2041, so that the two pipes are stably connected together to achieve smooth injection of coolant and achieve the purpose of rapid cooling. The other end of the spiral coil 2041 is installed with a second solenoid valve 2042 to facilitate the control of the on-off of the pipe, so that the coolant can be smoothly injected into the spiral cooling cavity; The spiral coil 2041 is provided with atomizing nozzles distributed at equal intervals on one side facing the contactor body 1, so as to smoothly atomize and spray out the coolant in the pipeline when needed, so as to achieve the purpose of atomizing and spraying cooling, and the injection pipe 204 is fixedly connected to the outer wall of the second shell 202 through the pipe bracket 208, so as to ensure that the injection pipe 204 can be stably installed on the second shell 202 to ensure stable use, and the end of the injection pipe 204 located outside the shell is connected to the external coolant delivery pipeline to ensure that the coolant is smoothly delivered to the injection pipe 204.

[0018] like Figure 1 , Figure 3 and Figure 5 As shown, in some embodiments, one end of the outer pipe 203 is connected to the discharge port 2013 opened at the corresponding position of the upper end of the first shell 201, so that during operation, the coolant medium in the cooling cavity formed by the shell is smoothly introduced into the outer pipe 203, so as to achieve smooth discharge of the outer medium, ensure that the new coolant medium can smoothly enter the cooling cavity, and continuously and stably cool the ceramic body at the contact part of the contactor body 1 effectively. The connecting branch pipe 2031 connected to the through hole opened at the corresponding position of the lower end of the first shell 201 is connected to the outer pipe 203, and the first solenoid valve 2032 is arranged on the connecting branch pipe 2031, so that the lower part of the cooling cavity inside the shell is connected to the outer pipe 203 through the connecting branch pipe 2031, and the first solenoid valve 2032 is used to control the opening and closing of the connecting branch pipe 2031, so as to achieve smooth switching when the connecting branch pipe 2031 is needed. One end of the external pipe 203 located outside the shell is connected to the return pipe and the air pipe respectively through a three-way adapter. Electric valves are installed at the connection parts of the return pipe and the air pipe with the three-way adapter. The three-way adapter is used to connect two external pipes to the external pipe 203, one of which is used as a return circulation pipe for the coolant, and the other is used as an external collection pipe for the vaporized coolant. The pipe is connected to a liquefaction recovery device to effectively recycle the vaporized coolant.

[0019] When the cooling mechanism is used to cool the vacuum contactor, in order to better understand the cooling effect, a temperature sensor is installed on the ceramic body of the contact part of the contactor, and a matching controller is installed at the same time. The controller and the temperature sensor and each valve are communicated and connected. During the cooling process, the temperature sensor detects the temperature of the ceramic body of the contact part in real time and transmits the temperature data to the controller. At the same time, the coolant enters the injection pipe 204 from the delivery pipeline, and then enters the spiral coil 2041 and is discharged from the second solenoid valve 2042 at its lower end. The cooling liquid enters the spiral cooling cavity separated by the spiral partition 206, and gradually fills the cavity. The cooling liquid and the ceramic body are contacted for heat exchange to take away the temperature on the ceramic body, thereby achieving the purpose of cooling. After the cooling liquid absorbs heat, it enters the outer discharge pipe 203 from the discharge port 2013 at the upper end of the first shell 201 and is discharged. During this process, the first solenoid valve 2032 is closed, the second solenoid valve 2042 is opened, the electric control valve of the three-way adapter connected to the air pipe is closed, and the electric control valve connected to the return pipe is opened. The cooling liquid after absorbing heat can smoothly enter the return pipe from the outer discharge pipe 203 and be discharged. When the temperature of the ceramic body at the contact part detected by the temperature sensor changes greatly in a short period of time, the controller controls the second solenoid valve 2042 to close and the first solenoid valve 2032 to open after receiving the temperature data information. At this time, the coolant in the spiral cooling cavity is discharged from the external exhaust pipe 203. Subsequently, the electric control valve connected to the air pipe of the three-way adapter is opened, and the electric control valve connected to the return pipe is closed. The coolant accumulates in the spiral coil 2041. The coolant pressure in the pipeline increases in a short period of time. When the pressure reaches the pressure at which the atomizing nozzle is opened, the coolant is sprayed out from the atomizing nozzle and contacts with the outer wall of the ceramic body to absorb heat and vaporize. The extraction device connected to the air pipe extracts the vaporized coolant in the spiral cooling cavity and discharges it smoothly, so as to quickly take away the temperature of the ceramic body and achieve the purpose of rapid cooling. In the process of extracting the vaporized coolant, the air pressure in the spiral cooling cavity changes. The outside air enters the spiral cooling cavity from the one-way air inlet valve 207 to balance the air pressure. When the temperature drops to the set value, the normal coolant immersion cooling method is restored to cool down. The above two cooling methods are used to achieve the purpose of cooling the ceramic body at the contact position, thereby ensuring long-term stable operation of the contactor.

[0020] Finally, it should be noted that the above description 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, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum contactor with a water cooling mechanism, comprising a cooling structure (2), characterized in that: The cooling structure (2) comprises a shell formed by a first shell (201) and a second shell (202) being assembled and spliced ​​together, the shell being mounted on the outside of a ceramic body at the contact portion of a vacuum arc extinguishing chamber of the contactor body (1), the cooling cavity formed between the inner wall of the shell and the upper outer wall of the ceramic body at the contact portion of the vacuum arc extinguishing chamber being divided into a spiral cooling cavity by a spiral partition (206), the spiral coil (2041) connected to the injection pipe (204) passing through the second shell (202) and extending into the spiral cooling cavity, the upper end of the outer exhaust pipe (203) being connected to the cooling cavity formed inside the shell, and a one-way air intake valve (207) being installed in a through hole opened at the bottom of the shell.

2. A vacuum contactor with a water cooling mechanism according to claim 1, characterized in that: A first bolt seat (2011) integrally provided on the first shell (201) is fixedly connected to a second bolt seat (2021) integrally provided on the second shell (202) via bolts, and a sealing gasket is arranged at a contact portion where the first shell (201) and the second shell (202) are spliced ​​with each other.

3. A vacuum contactor with a water cooling mechanism according to claim 2, characterized in that: Sealing rings (205) are arranged at both upper and lower ends of the outer shell composed of the first shell (201) and the second shell (202); the sealing rings (205) are embedded in a first limiting groove (2015) opened at a corresponding position on the first shell (201) and a second limiting groove (2025) opened at a corresponding position on the second shell (202).

4. A vacuum contactor with a water cooling mechanism according to claim 2, characterized in that: The first through hole (2014) opened at the bottom end of the first shell (201) and the second through hole (2024) opened at the bottom end of the second shell (202) form a through hole for installing the one-way air intake valve (207) at the bottom end of the combined shell, and the first through hole (2014) and the second through hole (2024) are both arranged in conjunction with the one-way air intake valve (207), and a sealing bushing is arranged at the connection between the one-way air intake valve (207) and the first through hole (2014) and the second through hole (2024).

5. The vacuum contactor with a water cooling mechanism according to claim 1, characterized in that: The spiral partition (206) is composed of a first arc plate (2012) on the inner wall of the first shell (201) and a second arc plate (2022) on the inner wall of the second shell (202); the first arc plate (2012) and the second arc plate (2022) have the same spiral angle, and the inner circle edge of the spiral partition (206) contacts the outer wall of the ceramic body of the contactor body (1).

6. A vacuum contactor with a water cooling mechanism according to claim 1, characterized in that: One end of the injection pipe (204) passes through a pipe sleeve (2023) integrally provided on the second shell (202), extends into the internal cooling cavity, and is connected to one end of the spiral coil (2041); the other end of the spiral coil (2041) is installed with a second solenoid valve (2042).

7. A vacuum contactor with a water cooling mechanism according to claim 6, characterized in that: Atomizing nozzles distributed at equal intervals are installed on the side of the spiral coil (2041) facing the contactor body (1), and the injection pipe (204) is fixedly connected to the outer wall of the second shell (202) through a pipe bracket (208), and one end of the injection pipe (204) located outside the shell is connected to an external coolant delivery pipeline.

8. The vacuum contactor with a water cooling mechanism according to claim 1, characterized in that: One end of the external discharge pipe (203) is connected to a discharge port (2013) opened at a corresponding position on the upper end of the first shell (201), and a connecting branch pipe (2031) connected to a through opening opened at a corresponding position on the lower end of the first shell (201) is connected to the external discharge pipe (203), and a first solenoid valve (2032) is arranged on the connecting branch pipe (2031).

9. A vacuum contactor with a water cooling mechanism according to claim 8, characterized in that: One end of the outer pipe (203) located outside the housing is connected to the return pipe and the air pipe respectively through a three-way adapter, and electric valves are installed at the connection parts of the return pipe and the air pipe with the three-way adapter.

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