CN203525575U - High-pressure mixed gas inflating device - Google Patents

Abstract

The utility model discloses a high-pressure mixed gas inflating device, which comprises at least two inflating branches with an air inlet end and an air outlet end, each inflating branch is provided with a pressure regulating unit and an inflating unit sequentially from the inlet end to the outlet end, each The outlet end of the inflation branch is in communication with the main inflation pipeline for connecting the air chamber, and the inflation unit includes a first throttle valve arranged in series and a gas flow meter connected to the outlet end of the inflation branch. The high-pressure mixed gas inflator of the utility model includes at least two inflatable branches with an air inlet end and an air outlet end, adopts a multi-branch parallel inflatable method, and can charge a large amount of mixed gas at one time; adopts a throttle valve and a gas flow meter to Combined with the control of the inflation flow rate, the inflation ratio of each gas can be precisely controlled; the implementation is easy, the labor intensity of the workers is reduced, and the pipeline is simple. The inflation device can be incorporated into the gas recovery system commonly used in high-voltage electrical equipment.

Description

High pressure mixed gas inflator

technical field

The utility model belongs to the field of a mixed gas inflator for high-voltage electrical equipment, and relates to a mixed gas inflator for high-voltage electrical equipment.

Background technique

Sulfur hexafluoride gas has become one of the most promising insulation and arc extinguishing media due to its good insulation properties, and is widely used in the field of power transmission and distribution equipment, such as circuit breakers (GCB), combined electrical appliances (GIS), transformers (GIT), cables (GIC), etc., but sulfur hexafluoride gas also has shortcomings as an insulating medium, such as being sensitive to the uniformity of the electric field, and can only show its advantages in a uniform or slightly uneven electric field. Under the action of electric arc, it can decompose toxic gas arbitrarily, and its liquefaction temperature is relatively high, and it is easier to liquefy at (3~4)*10 ⁵ Pa; its price is relatively high, which limits its application. Therefore, with the development of science and technology, the insulating protective gas used for high-voltage electrical equipment began to change from pure sulfur hexafluoride gas to excessive mixing of sulfur hexafluoride and other gases.

When using a mixed gas for insulation, the proportion of each gas in the mixed gas also needs to be strictly controlled. In practical engineering applications, the series inflation method is generally used to control the inflation ratio of various gases, that is, when inflating the air chamber, first inflate a gas, observe its inflation pressure, and then inflate it after it reaches the specified pressure. Another gas to ensure the gas ratio is correct. However, this method has certain shortcomings: (1) First, it seems powerless when dealing with a large space and an air chamber with pressure requirements. For example, when inflating a certain type of tank switch, it needs to be inflated continuously for several hours, and During the entire inflation process, workers need to track and monitor the inflation pressure near the gas cylinder; (2) Secondly, when the high-voltage electrical equipment is in a low-voltage alarm state and needs to replenish the gas twice, it is difficult to use this series inflation method according to the gas displayed by the pressure gauge. The internal pressure of the chamber is used to supplement the air chamber for the second time.

Chinese Patent No. CN92107330.5 discloses a mixed gas configuration method and device. The device solves the problem of the mixing ratio of various gases in principle, but the mixing principle is to mix through the cylinder, and the volume of the cylinder should not be too large. Therefore, it is not suitable for the occasion where a large amount of mixed gas is charged at one time, and at the same time, the inflation ratio of various gases cannot be adjusted in real time during the inflation process.

Chinese Patent No. 201210109352.1 discloses a method and device for mixing multiple gases in a specified ratio. The device adopts the same type of solenoid valve with the same diameter and flow rate, and controls the opening time or opening time of different solenoid valves. The number of times realizes the control of the mixing ratio of various gases. This inflation device needs to strictly monitor the inflation time, and simultaneously needs to control a plurality of solenoid valves, so the control is relatively complicated.

Utility model content

The purpose of this utility model is to provide a high-pressure mixed gas inflator to solve the problem that the existing high-pressure mixed gas inflator cannot mix and inflate a large amount of gas at one time and adjust the inflating ratio of various gases in real time during the inflating process.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a high-pressure mixed gas inflator, including at least two inflatable branches with an inlet end and an air outlet end, and each inflatable branch is sequentially connected from the inlet end to the outlet end. A pressure regulating unit and an air charging unit are provided, and the gas outlet of each gas charging branch is communicated with the main gas charging pipeline used to connect the air chamber. Barometer.

The pressure regulating unit includes a second throttle valve, a pressure regulating valve and a pressure regulating solenoid valve arranged in series in sequence, and the second throttle valve is arranged at the inlet end of each charging branch for communicating with the gas source; The pressure regulating solenoid valve is connected with a controller for control.

The two charging branches are the sulfur hexafluoride charging branch and the nitrogen charging branch respectively.

A first pressure gauge for observing the air source pressure of each branch is installed on the charging branch between the first throttle valve and the pressure regulating valve.

A second pressure gauge for observing the inflation pressure is arranged on the inflation branch between the pressure regulating valve and the inflation solenoid valve.

A third pressure gauge for observing the gas pressure of the main pipeline is provided on the main inflation pipeline.

The third pressure gauge is an electromagnetically controlled air gauge controlled by a controller.

The pressure regulating solenoid valve is a two-position two-way solenoid valve.

The high-pressure mixed gas inflating device of the utility model includes at least two inflating branches with an air inlet end and an air outlet end, adopts a multi-branch parallel inflating method, and can charge a large amount of mixed gas at one time; adopts a throttle valve and a gas flow meter to Combined with the control of the inflation flow rate, the inflation ratio of each gas can be precisely controlled; the conventional control inflation components are used and controlled by the controller, which is easy to implement, reduces the labor intensity of the workers, and the pipeline is simple. This inflation device can be incorporated into the high-voltage electrical The equipment is commonly used in the gas recovery system.

Each barometer can be set so that during the whole inflation process, few people or no one monitors it.

Description of drawings

Fig. 1 is a structural diagram of an embodiment of the high-pressure mixed gas inflator of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is further introduced.

As shown in Figure 1, it is the structural diagram of the embodiment of the high-pressure mixed gas inflator of the present invention. As can be seen from the figure, the device includes at least two inflation branches with an inlet end and an outlet end, and each inflation branch is from the inlet end to the gas outlet. The outlet end is provided with a pressure regulating unit and an air charging unit in turn, and the outlet end of each air charging branch is connected with the main air charging pipeline used to connect the air chamber; Gas flow meter 5 at the gas outlet.

The pressure regulating unit of this embodiment includes a second throttle valve 9, a pressure regulating valve 3 and a pressure regulating solenoid valve 4 arranged in series in sequence. The source is connected; the pressure regulating solenoid valve 4 is controlled by the controller.

In practical engineering applications, the insulating gas used in the field of high-voltage equipment is generally sulfur hexafluoride, and now it has gradually developed to the mixed gas insulation of sulfur hexafluoride and nitrogen, so the two gas filling branches in this embodiment are respectively Sulfur hexafluoride charging branch and nitrogen charging branch.

The pressure regulating solenoid valve 4 of this embodiment is a two-position two-way solenoid valve, and both the two-position two-way solenoid valve and the pressure regulating valve 3 are in a normally closed state.

In order to observe the gas pressure at each stage, in this embodiment, a first pressure gauge 2 for observing the gas source pressure of each branch is provided on the charging branch road between the second throttle valve 9 and the pressure regulating valve 3, which is used for monitoring The gas pressure of the gas source (steel cylinder) is generally set to 1MPa when the air pressure is too low, and the barometer will automatically alarm to prompt replacement of the gas source (steel cylinder); There is a second pressure gauge 8 for observing the inflation pressure, which is used for monitoring the output gas pressure of the regulating valve. At the same time, the output air pressure of the air pressure gauge 8 of multiple branches must be consistent, and the set pressure is equal to the inflation pressure required by the technical conditions of high-voltage electrical products; The pressure gauge is an electromagnetically controlled air gauge controlled by a controller.

Since the density of sulfur hexafluoride gas does not change according to the ideal gas state equation, the inflation ratio of this inflation system is the volume ratio of various gases under the same pressure. If it is necessary to calculate the mass ratio between different gases, it is also necessary to calculate the density of the gas under the same pressure, and then convert it into volume for inflation. The gas flow meter is used to control the mixing ratio of the inflated gas during the entire inflation process. Since the gas flow meter 5 has the ability to record the instantaneous flow meter and the cumulative flow, the gas flow can be controlled by adjusting the pressure regulating valve 3 and the first throttle valve 7. The output pressure and flow rate of the source, thereby controlling the inflation rate of the gas. When the inflation ratio is stable, the third pressure gauge 6 (electromagnetic control air gauge) installed on the main air circuit will send a signal to the pressure regulating solenoid valve 4 on each branch circuit through the controller after the inflation reaches the pressure value required by the technology. It is controlled to cut off the inflation branch, thereby completing the entire inflation process.

Take two inflatable branches as an example to illustrate the working principle of the utility model: after the air circuit is connected to the air chamber, the pressure regulating solenoid valve 4 on the two inflated branches is in the off state, and the air source 1 and the second throttle valve are opened 9. Observe the pressure of the first pressure gauge 2 in the branch to see if it meets the inflation requirements. If the pressure is too low, you need to replace the air source 1.

After the air source pressure meets the conditions, open the pressure regulating valve 3 on the branch road, observe the pressure of the second pressure gauge 8, and set its output pressure at the inflation pressure required by the technical conditions of high-voltage electrical products. After the pressure of the pressure gauge 8 is consistent, open the inflation solenoid valve 4, compare the observation gas flow meter 5 on the observation branch road, and adjust the first throttle valve 7 to make the flow ratio meet the inflation ratio.

Finally, after the third pressure gauge 6 reaches the pressure required by the technical conditions of high-voltage electrical products, the controller feeds back signals to the pressure-regulating solenoid valves 4 on the two inflation branches to shut off the inflation branches.

The utility model is described by taking two kinds of gas mixed inflatables as an example, and the inflatable branch can also be added according to the needs, and expanded into a variety of gas mixed inflatable devices. within the scope of protection.

Claims (8)

1. a high pressure mixed gas aerating device, comprise at least two inflation branch roads with inlet end and outlet side, comprise at least two inflation branch roads with inlet end and outlet side, on each inflation branch road, from entrance point to the port of export, be provided with successively pressure regulation unit and inflation unit, each outlet side of inflating branch road with for being connected the inflation main pipe rail of air chamber, be communicated with, it is characterized in that: inflation unit comprises the first throttle valve that string is established successively and is connected to the gas flowmeter of inflating branch road outlet side.

2. high pressure mixed gas aerating device according to claim 1, it is characterized in that: described pressure regulation unit comprises the second choke valve, pressure regulator valve and the pressure regulating solenoid valve that string is established successively, described the second choke valve is located at respectively inflates branch road inlet end for being communicated with source of the gas; Described pressure regulating solenoid valve is controlled and is connected with a controller.

3. high pressure mixed gas aerating device according to claim 1 and 2, is characterized in that: described two inflation branch roads are respectively sulfur hexafluoride gas-filled branch road and nitrogen inflation branch road.

4. high pressure mixed gas aerating device according to claim 3, is characterized in that: the inflation branch road between described first throttle valve and pressure regulator valve is provided with for observing the first Pressure gauge of each branch road bleed pressure.

5. high pressure mixed gas aerating device according to claim 3, is characterized in that: the inflation branch road between described pressure regulator valve and inflation magnetic valve is provided with for observing the second Pressure gauge of the blowing pressure.

6. high pressure mixed gas aerating device according to claim 3, is characterized in that: described inflation main pipe rail is provided with for observing the 3rd Pressure gauge of main pipe rail gas pressure.

7. high pressure mixed gas aerating device according to claim 6, is characterized in that: the Electromagnetic Control air gauge of described the 3rd Pressure gauge for being controlled by controller.

8. high pressure mixed gas aerating device according to claim 2, is characterized in that: described pressure regulating solenoid valve is two-position two-way solenoid valve.

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