CN111059320A

CN111059320A - Double-branch single-way check valve

Info

Publication number: CN111059320A
Application number: CN201911341528.4A
Authority: CN
Inventors: 孙旭; 石建; 程从明; 于素梅; 王永强; 丁领; 李德玉
Original assignee: Baoding Tianwei Baobian Electric Co Ltd
Current assignee: Baoding Tianwei Baobian Electric Co Ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-04-24

Abstract

The invention relates to a double-branch single-pass check valve, and belongs to the technical field of transformers. The technical scheme is as follows: the check valve (3) comprises a valve body (4), a valve clack (5), a sealing rubber mat (6), a rotating shaft (7) and a rotating shaft fixing piece (8), the rotating shaft fixing piece (8) is welded on the valve body (4), the sealing rubber mat (6) is installed on the valve clack (5), and the valve clack and the rotating shaft fixing piece (8) are connected together through the rotating shaft (7) so that the valve clack rotates inside the valve body along the rotating shaft. The invention utilizes the double-branch one-way check valve to replace a three-way pipe structure, is arranged between two parallel branches which are respectively provided with an oil pump and a transformer body in a cooling system pipeline, can effectively prevent the problem that oil flows back to a standby pump at the other side when the oil pump at the one side runs, ensures the preset cooling effect of the transformer, can ensure that the oil flows can not flow back through the branch of the fault oil pump when the working oil pump is in fault shutdown, and provides guarantee for the long-term stable running of the transformer.

Description

Double-branch single-way check valve

Technical Field

The invention relates to a double-branch single-pass check valve, and belongs to the technical field of transformers.

Background

The forced oil circulation cooling type power transformer is one of main devices in the operation of a large backbone power grid system, is widely applied to power plants and power transmission lines, and plays an important role in power generation and grid hanging and long-distance trans-regional power transmission. Because the capacity and the voltage level of the transformer are generally higher, the heat productivity in the transformer body is very large during working, and in order to ensure long-term stable operation, more and more transformer products start to use a double-oil pump branch parallel structure in a strong oil pipeline. The structure is characterized in that an original oil conveying pipeline is divided into two branches, an oil pump (capable of being provided with an oil flow relay) is installed on each branch, the two branches are connected with a transformer through a three-way pipe, only the oil pump of the branch on one side is in a working state when the transformer operates, and the oil pump on the other side is in a standby state when the transformer operates. When the working pump is in failure and stops, the automatic monitoring device controls the standby pump to start, so that the strong oil circulation is not interrupted, and the cooling effect of the transformer is not weakened due to the failure of the oil pump. When the single-side oil pump transfers oil to the transformer side in actual use, due to the fact that large oil flow resistance exists in the internal structure of the transformer, oil flow tends to return to a branch on one side of the standby pump, and the oil flow resistance on one side of the standby pump is relatively small, most of oil flow flows to the radiator side through the three-way pipe and the standby pump, and finally circulation flow is formed in the two parallel branches, so that the actual cooling effect of the transformer is greatly weakened, the safe and stable operation of the transformer is affected, and in conclusion, the structure has large unreasonable points and needs to be improved to solve the problem.

Disclosure of Invention

The invention aims to provide a double-branch single-pass check valve, which is arranged between two parallel branches respectively provided with an oil pump and a transformer body in a cooling system pipeline and can effectively prevent the problem that oil flows return to a standby pump at the other side when a single-side branch oil pump operates, ensure the preset cooling effect of a transformer, when the working oil pump fails and stops, the standby oil pump at the other side starts to operate, drive the oil flow to enter the check valve, push a valve clack to turn to one side of the failed and stopped oil pump branch, and seal an oil inlet of the failed and stopped oil pump branch, thereby ensuring that the oil flows cannot return through the failed oil pump branch, providing guarantee for the long-term stable operation of the transformer, and effectively solving the problems in the background technology.

The technical scheme of the invention is as follows: a double-branch single-pass check valve comprises an oil pump, an oil flow relay and a check valve, wherein the oil pump and the oil flow relay are respectively arranged on two parallel oil pump branches and are respectively connected to an oil inlet of the check valve, and an oil outlet of the check valve is connected with a transformer body; the check valve comprises a valve body, a valve clack, a sealing rubber gasket, a rotating shaft and a rotating shaft fixing piece, wherein the rotating shaft fixing piece is welded on the valve body, the sealing rubber gasket is installed on the valve clack, and the valve clack and the rotating shaft fixing piece are connected together through the rotating shaft so that the valve clack rotates inside the valve body along the rotating shaft.

The length of the sealing rubber gasket is matched with the diameter of the oil inlet.

The invention has the beneficial effects that: utilize the single-pass check valve of two branches to replace the tee bend tubular construction, install in the cooling system pipeline between two parallel branch roads that are equipped with an oil pump respectively and the transformer body, can effectively prevent the problem that the oil stream flows back to opposite side stand-by pump when unilateral branch road oil pump moves, the predetermined cooling effect of transformer has been guaranteed, when the fault shutdown appears in the working oil pump, the stand-by pump of opposite side begins working, the drive oil stream gets into in the check valve, promote the valve clack and turn to fault shutdown oil pump branch road one side, seal its oil inlet, thereby guarantee that the oil stream can not flow back through the fault oil pump branch road, provide the guarantee for the long-term steady operation of transformer.

Drawings

FIG. 1 is a schematic view of the installation of the present invention;

FIG. 2 is a schematic view of the check valve of the present invention;

in the figure: the oil pump comprises an oil pump 1, an oil flow relay 2, a check valve 3, a valve body 4, a valve clack 5, a sealing rubber gasket 6, a rotating shaft 7, a rotating shaft fixing part 8, an oil inlet 31, an oil outlet 32, a radiator side 9 and a transformer side 10.

Detailed Description

The technical solution of the present invention is further described in detail with reference to the accompanying drawings and examples.

A double-branch single-pass check valve comprises an oil pump 1, an oil flow relay 2 and a check valve 3, wherein the oil pump 1 and the oil flow relay 2 are respectively arranged on two parallel oil pump branches and are respectively connected to an oil inlet 31 of the check valve 3, and an oil outlet 32 of the check valve 3 is connected with a transformer body; check valve 3 contains valve body 4, valve clack 5, sealed cushion 6, pivot 7 and pivot mounting 8, and pivot mounting 8 welds on valve body 4, and sealed cushion 6 is installed on valve clack 5, and pivot 7 links together valve clack 5 and pivot mounting 8, makes valve clack 5 along pivot 7 inside the rotation of valve body 4.

The length of the sealing rubber gasket 6 is matched with the diameter of the oil inlet 31.

In practical application, only one oil pump in two parallel branches is in a working state, the other oil pump is in a standby state, when the oil pump 1 on one side is in the working state, the oil flow enters the oil inlet of the check valve 3 through the oil flow relay 2, the oil flow pushes the valve clack 5 of the check valve 3 to turn to the other side in the valve body 4 along the rotating shaft 7, the other side is connected with the standby oil pump through the sealing rubber pad 6 arranged on the valve clack 5, the oil flow cannot return to the branch on one side of the standby oil pump, and the oil flow is forced to only flow into the transformer body, so that the problem that the oil flow forms circulation in the two parallel branches is effectively prevented, and the cooling effect of the transformer is ensured. When the working oil pump fails and stops, the backup oil pump on the other side starts to work, the oil flow is driven to enter the check valve, the valve clack is pushed to turn to one side of the fault stop oil pump branch, and the oil inlet of the fault stop oil pump branch is closed, so that the oil flow can not return through the fault oil pump branch, the oil flow circulation of the whole cooling system can still normally operate, and the transformer can stably operate for a long time.

The check valve can also play the same role for liquid conveying pipelines with other similar structures, and the check valve is only required to be made of corresponding materials according to the type of liquid and installed and used, so that the check valve structure has wide universality.

Claims

1. The utility model provides a two branch way single-pass check valve which characterized in that: the transformer comprises an oil pump (1), an oil flow relay (2) and a check valve (3), wherein the oil pump (1) and the oil flow relay (2) are respectively arranged on two parallel oil pump branches and are respectively connected to an oil inlet (31) of the check valve (3), and an oil outlet (32) of the check valve (3) is connected with a transformer body; the check valve (3) comprises a valve body (4), a valve clack (5), a sealing rubber mat (6), a rotating shaft (7) and a rotating shaft fixing piece (8), the rotating shaft fixing piece (8) is welded on the valve body (4), the sealing rubber mat (6) is installed on the valve clack (5), and the valve clack (5) and the rotating shaft fixing piece (8) are connected together through the rotating shaft (7) so that the valve clack (5) rotates inside the valve body (4) along the rotating shaft (7).

2. A two-branch, one-way check valve as defined in claim 1, wherein: the length of the sealing rubber gasket (6) is matched with the diameter of the oil inlet (31).