Backing stage pressure reducers

Abstract

The invention relates to a pre-stage reducer, comprising at least two stages of reduction chambers and back pressure chambers, each stage of reduction chamber and back pressure chamber are separated by a diaphragm, valve seats are arranged between the stages of reduction chambers. The invention is characterized in that the gas inlet side of at least one valve seat is provided with a servo regulating electric valve. The gas inlet side of the valve seat between the reduction chamber and the back pressure chamber is provided with a servo regulating electric valve controlled by an ECU (electric control center); the flow of the output gas of the reducer is adjusted appropriately according to the working condition of the gas engine of an automobile, thus to improve the emission index of the engine, reaching to the Europe 2# standard.

Description

technical field

[0001] The invention relates to a pressure reducer, in particular to a pre-stage pressure reducer with an electric control regulating valve for gas vehicles. Background technique

[0002] The pressure reducer is a key component between the gas cylinder and the engine in a natural gas vehicle. It reduces the high-pressure natural gas in the cylinder to normal pressure and enters the mixer to mix with air before entering the engine. At present, the more advanced one is the integrated three-stage pressure reducer, that is, the three-stage decompression chamber and the back pressure chamber are coaxially arranged, and there are set Valve seat, this pressure reducer realizes a relatively stable gas supply to the mixer. However, since the flow rate of the gas output by the pressure reducer is still randomly adjusted and controlled with the opening of the engine throttle, in fact, many factors such as the temperature and calorific value of the gas, the atmospheric ...

Examples

Embodiment Construction

[0010] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0011] see figure 1 , the pre-stage pressure reducer, which includes at least two stages of decompression chambers and back pressure chambers, each stage of decompression chamber and back pressure chamber is separated by a diaphragm, and each stage of decompression chamber is provided with a valve seat. At least one side of the air inlet of the valve seat is provided with a servo-regulated electric valve, and the side of the air inlet of the valve seat between the decompression chamber and the back pressure chamber is provided with a servo-regulated electric valve, and the servo-regulated electric valve is controlled by the ECU (electrically controlled center) control.

[0012] The ECU (Electronic Control Center) collects air temperature inform...

technical field

[0001] The invention relates to a pressure reducer, in particular to a pre-stage pressure reducer with an electric control regulating valve for gas vehicles. Background technique

[0002] The pressure reducer is a key component between the gas cylinder and the engine in a natural gas vehicle. It reduces the high-pressure natural gas in the cylinder to normal pressure and enters the mixer to mix with air before entering the engine. At present, the more advanced one is the integrated three-stage pressure reducer, that is, the three-stage decompression chamber and the back pressure chamber are coaxially arranged, and there are set Valve seat, this pressure reducer realizes a relatively stable gas supply to the mixer. However, since the flow rate of the gas output by the pressure reducer is still randomly adjusted and controlled with the opening of the engine throttle, in fact, many factors such as the temperature and calorific value of the gas, the atmospheric ...

Examples

Embodiment Construction

[0010] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0011] see figure 1 , the pre-stage pressure reducer, which includes at least two stages of decompression chambers and back pressure chambers, each stage of decompression chamber and back pressure chamber is separated by a diaphragm, and each stage of decompression chamber is provided with a valve seat. At least one side of the air inlet of the valve seat is provided with a servo-regulated electric valve, and the side of the air inlet of the valve seat between the decompression chamber and the back pressure chamber is provided with a servo-regulated electric valve, and the servo-regulated electric valve is controlled by the ECU (electrically controlled center) control.

[0012] The ECU (Electronic Control Center) collects air temperature inform...

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