Cng pressure regulating device for generator

Abstract

The utility model relates to natural gas pressure regulating technical field, concretely relates to a CNG pressure regulating device for generator, the auxiliary heater of this design provides external heat supplement for the CNG gas that passes through pressure reducing valve through electric heating or engine circulating water heating mode, prevents system icing, avoids blocking pressure reducer valve, diaphragm hole and gas pipeline, thereby guarantees gas continuous supply and engine stable operation, simultaneously, the suitable temperature environment maintained by auxiliary heater protects the sealing element such as rubber diaphragm and O ring in the pressure reducer, prevents its hardening, fragile because of extremely low temperature, has guaranteed the sealing property and functional effectiveness of pressure reducer, besides, multistage pressure reducing valve cooperates intelligent flowmeter, has realized the accurate control and stable output of gas pressure, has reduced the influence of gas temperature fluctuation to density, and then has guaranteed the accurate control of engine electronic control unit to air-fuel ratio, has improved engine power, acceleration performance and combustion efficiency.

Description

Technical Field

[0001] This utility model relates to the field of natural gas pressure regulation technology, and in particular to a CNG pressure regulating device for generators. Background Technology

[0002] With natural gas being widely used as a clean energy source in generator sets, existing CNG pressure regulating devices play a crucial role in regulating natural gas pressure. Through a CNG pressure reducer, the high-pressure CNG stored in the cylinder can be adjusted to the low pressure (a few tenths of a megapascal to several thousand kPa) required by the engine's injection system, thus meeting the engine's normal operating requirements. This pressure regulation function not only improves the utilization efficiency of natural gas but also reduces pollutant emissions during engine operation, which is of great significance for environmental protection and energy conservation.

[0003] However, because the temperature of high-pressure gas drops sharply when it expands rapidly, the temperature of the natural gas after the pressure reducing valve can drop to -30°C to -70°C without external heat supplementation. This can cause the system to freeze, clogging the pressure reducing valve, diaphragm orifice, and gas pipeline, leading to gas supply interruption and engine stalling. Secondly, the extremely low temperature can also cause the rubber diaphragm and O-rings inside the pressure reducing valve to harden and become brittle, losing their elasticity and sealing ability, leading to pressure reducing valve failure or leakage, posing a safety hazard. In addition, fluctuations in gas temperature can also affect its density, thereby interfering with the engine electronic control unit's precise control of the air-fuel ratio, resulting in problems such as reduced engine power, weak acceleration, incomplete combustion, and unstable operation. Utility Model Content

[0004] The purpose of this invention is to provide a CNG pressure regulating device for generators, aiming to solve the technical problems in the prior art where, due to the rapid expansion of high-pressure gas, the temperature drops sharply. Without external heat supplementation, the temperature of the natural gas after the pressure reducing valve can drop to -30℃ to -70℃, causing the system to freeze, blocking the pressure reducing valve, diaphragm orifice, and gas pipeline, leading to gas supply interruption and engine stalling. Secondly, extremely low temperatures can also cause the rubber diaphragm and O-rings and other seals inside the pressure reducing valve to harden and become brittle, losing their elasticity and sealing ability, leading to pressure reducing valve failure or leakage, posing a safety hazard. In addition, fluctuations in gas temperature can also affect its density, thereby interfering with the engine electronic control unit's precise control of the air-fuel ratio, resulting in reduced engine power, weak acceleration, incomplete combustion, and unstable operation.

[0005] To achieve the above objectives, this utility model employs a CNG pressure regulating device for generators, comprising a housing, an auxiliary heater, a pressure transmitter, and a junction box. An inlet pipe is provided at one interface of the auxiliary heater. The auxiliary heater and the pressure transmitter are connected via a high-pressure pipe, and a high-pressure filter is provided between the high-pressure pipe and the auxiliary heater. A primary pressure reducing valve is provided at one end of the high-pressure pipe. A secondary pressure reducing valve is provided at one end of the primary pressure reducing valve via the primary pressure reducing pipe. A smart flow meter is provided at one end of the secondary pressure reducing valve via the secondary pressure reducing pipe. A tertiary pressure reducing valve is provided at one end of the smart flow meter via the tertiary pressure reducing pipe. A copper ball valve is provided at the tertiary pressure reducing valve via a connecting pipe.

[0006] The intake pipe is equipped with a high-pressure ball valve, one end of the intake pipe is equipped with a quick-connect connector, and the other end of the intake pipe is equipped with a vent valve and a vent pipe.

[0007] The auxiliary heater is equipped with a thermometer and a level gauge.

[0008] The high-pressure pipe is equipped with a first pressure gauge, the first-stage pressure reducing pipe is equipped with a second pressure gauge, the second-stage pressure reducing pipe is equipped with a third pressure gauge and a first pressure gauge valve, and the connecting pipe is equipped with a fourth pressure gauge and a second pressure gauge valve.

[0009] A safety valve is provided between the primary pressure reducing valve and the secondary pressure reducing valve, and a manifold is provided at the outlet of the safety valve.

[0010] This invention relates to a CNG pressure regulating device for generators. The auxiliary heater in this design provides external heat to the CNG gas passing through the pressure reducing valve via electric heating or engine circulating water heating. This prevents system freezing and avoids clogging of the pressure reducing valve, diaphragm orifice, and gas pipeline, thus ensuring a continuous gas supply and stable engine operation. Simultaneously, the suitable temperature environment maintained by the auxiliary heater protects the rubber diaphragm and O-rings inside the pressure reducing valve from hardening and becoming brittle due to extremely low temperatures, ensuring the pressure reducing valve's sealing performance and functional effectiveness. Furthermore, the multi-stage pressure reducing valve, in conjunction with an intelligent flow meter, achieves precise control and stable output of gas pressure, reducing the impact of gas temperature fluctuations on density. This, in turn, ensures precise control of the air-fuel ratio by the engine's electronic control unit, improving engine power, acceleration performance, and combustion efficiency, and solving problems such as unstable engine operation. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the CNG voltage regulating device for generators according to this utility model.

[0013] 1-Relief valve, 2-Quick-connect connector, 3-High-pressure ball valve, 4-Auxiliary heater, 5-Level gauge, 6-Thermometer, 7-High-pressure filter, 8-Pressure transmitter, 9-First pressure gauge, 10-First-stage pressure reducing valve, 11-Second pressure gauge, 12-Second-stage pressure reducing valve, 13-Third pressure gauge, 14-First pressure gauge valve, 15-Intelligent flow meter, 16-Third-stage pressure reducing valve, 17-Fourth pressure gauge, 18-Second pressure gauge valve, 19-Copper ball valve, 20-Junction box, 21-Safety valve, 22-Box body, 23-Inlet pipe, 24-High-pressure pipe, 25-First-stage pressure reducing pipe, 26-Second-stage pressure reducing pipe, 27-Third-stage pressure reducing pipe, 28-Manifold, 29-Connecting pipe. Detailed Implementation

[0014] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0015] Please see Figure 1 This utility model provides a CNG pressure regulating device for generators, including a housing 22. An auxiliary heater 4, a pressure transmitter 8, and a junction box 20 are installed inside the housing 22. An air inlet pipe 23 is installed at one interface of the auxiliary heater 4. The auxiliary heater 4 and the pressure transmitter 8 are connected by a high-pressure pipe 24, and a high-pressure filter 7 is installed between the high-pressure pipe 24 and the auxiliary heater 4. A primary pressure reducing valve 10 is installed at one end of the high-pressure pipe 24. A secondary pressure reducing valve 12 is installed at one end of the primary pressure reducing valve 10 via a primary pressure reducing pipe 25. A smart flow meter 15 is installed at one end of the secondary pressure reducing valve 12 via a secondary pressure reducing pipe 26. A tertiary pressure reducing valve 16 is installed at one end of the smart flow meter 15 via a tertiary pressure reducing pipe 27. A copper ball valve 19 is installed at the tertiary pressure reducing valve 16 via a connecting pipe 29.

[0016] In this embodiment, the auxiliary heater 4, multi-stage pressure reducing valve, and intelligent flow meter 15 achieve heating, graded pressure regulation, and precise metering of CNG gas. The auxiliary heater 4, supplemented by external heat, solves the low-temperature problem caused by high-pressure gas expansion, prevents system freezing and seal embrittlement, and ensures a stable gas supply. The multi-stage pressure reducing valve adopts a "rapid pressure reduction + precision correction + fine adjustment" design, effectively coping with gas pressure fluctuations and ensuring that the output pressure remains stable within the generator set's requirements. The intelligent flow meter 15 monitors the gas flow in real time, assisting in judging the gas volume in the storage cylinder and the unit's operating status. The overall structure is compact, adaptable to generator set installation space limitations, and improves system reliability and maintenance convenience.

[0017] Furthermore, a high-pressure ball valve 3 is provided on the intake pipe 23, a quick-connect connector 2 is provided at one end of the intake pipe 23, and a vent valve 1 and a vent pipe are provided at the other end of the intake pipe 23.

[0018] In this embodiment, the opening and closing of the air intake pipe 23 can be manually controlled by the high-pressure ball valve 3, and the excess gas can be automatically discharged when the pressure is abnormal, in conjunction with the relief valve 1, to prevent the pressure regulating device from being damaged due to overpressure. The design of the quick-connect connector 2 simplifies the connection and disassembly process between the air intake pipe 23 and the external system, shortens the maintenance time, and avoids the leakage risk that may be caused by the traditional fixed connection method, thereby improving the safety and operation efficiency of the system.

[0019] Furthermore, the auxiliary heater 4 is equipped with a thermometer 6 and a level gauge 5.

[0020] In this embodiment, the temperature of the coolant or water in the auxiliary heater 4 is monitored in real time by the thermometer 6 to ensure that the heating power matches the CNG gas demand and to prevent overheating or insufficient heating; the liquid level gauge 5 monitors the liquid volume in the auxiliary heater 4 to avoid the electric heating tube from burning dry or the circulating water heating from failing due to the liquid level being too low, thereby ensuring the long-term stable operation of the auxiliary heater 4.

[0021] Furthermore, a first pressure gauge 9 is provided on the high-pressure pipe 24, a second pressure gauge 11 is provided on the first-stage pressure reducing pipe 25, a third pressure gauge 13 and a first pressure gauge valve 14 are provided on the second-stage pressure reducing pipe 26, and a fourth pressure gauge 17 and a second pressure gauge valve 18 are provided on the connecting pipe 29.

[0022] In this embodiment, the first pressure gauge 9 monitors the inlet pressure of the high-pressure pipe 24 to reflect the gas volume of the gas storage cylinder group; the second and third pressure gauges 13 monitor the pressure after the first and second stage pressure reduction respectively to verify the pressure adjustment accuracy of the pressure reducing valve; the fourth pressure gauge 17 monitors the output pressure of the third stage pressure reducing valve 16 to ensure that the final pressure meets the requirements of the generator set; the pressure gauge valve can isolate the pressure gauge for maintenance or calibration to avoid misjudgment due to instrument failure.

[0023] Furthermore, a safety valve 21 is provided between the primary pressure reducing valve 10 and the secondary pressure reducing valve 16, and a manifold 28 is provided at the outlet of the safety valve 21.

[0024] In this embodiment, when the pipeline pressure rises abnormally due to a malfunction of the primary or secondary pressure reducing valve 12, the safety valve 21 automatically opens and discharges excess gas to a safe area through the manifold 28, preventing damage to the pressure regulating device or generator set due to overpressure.

[0025] In this invention, the intake pipe 23 is connected to the external system via the quick-connect connector 2, ensuring that the high-pressure ball valve 3 and the vent valve 1 are closed. Before starting the generator set, the auxiliary heater 4 is turned on (using electric heating or engine circulating water heating mode). The temperature and level of the heating medium are monitored by the thermometer 6 and the level gauge 5 to maintain the coolant or water within the range of 55-65℃, ensuring that the CNG gas flowing through the coil is preheated to above 5℃ to prevent freezing and embrittlement of seals due to low temperature. Simultaneously, high-pressure CNG gas enters the high-pressure pipe 24 from the gas cylinder group, passes through the high-pressure filter 7 to filter impurities, and then sequentially passes through the first-stage pressure reducing valve 10 (quick-connect connector 2). The system rapidly reduces pressure to near the target pressure, and the secondary pressure reducing valve 12 (self-regulating pressure correction) and the tertiary pressure reducing valve 16 (precise control with a fine-tuning nut) ultimately output stable gas pressure. During the process, the first to fourth pressure gauges 17 display the pressure values ​​at each stage in real time, and the intelligent flow meter 15 monitors the gas flow and feeds it back to the generator set ECU. The ECU adjusts the injection time according to the data to maintain the air-fuel ratio. If the pipeline pressure rises abnormally, the safety valve 21 automatically opens to release pressure through the manifold 28, ensuring system safety. During maintenance, modules can be quickly disassembled through union connections and quick-connect fittings, and the pressure gauge valve can be used to isolate the pressure gauge for repair, ensuring long-term reliable operation of the device.

[0026] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A CNG voltage regulating device for a generator, characterized in that, The device includes a housing, inside which are installed an auxiliary heater, a pressure transmitter, and a junction box. An air inlet pipe is installed at one interface of the auxiliary heater. The auxiliary heater and the pressure transmitter are connected via a high-pressure pipe, and a high-pressure filter is installed between the high-pressure pipe and the auxiliary heater. A primary pressure reducing valve is installed at one end of the high-pressure pipe. A secondary pressure reducing valve is installed at one end of the primary pressure reducing valve via a primary pressure reducing pipe. A smart flow meter is installed at one end of the secondary pressure reducing valve via a secondary pressure reducing pipe. A tertiary pressure reducing valve is installed at one end of the smart flow meter via a tertiary pressure reducing pipe. A copper ball valve is installed at the tertiary pressure reducing valve via a connecting pipe.

2. The CNG voltage regulating device for generators as described in claim 1, characterized in that, The intake pipe is equipped with a high-pressure ball valve, one end of the intake pipe is equipped with a quick-connect connector, and the other end of the intake pipe is equipped with a vent valve and a vent pipe.

3. The CNG voltage regulating device for generators as described in claim 2, characterized in that, The auxiliary heater is equipped with a thermometer and a level gauge.

4. The CNG voltage regulating device for generators as described in claim 3, characterized in that, The high-pressure pipe is equipped with a first pressure gauge, the first-stage pressure reducing pipe is equipped with a second pressure gauge, the second-stage pressure reducing pipe is equipped with a third pressure gauge and a first pressure gauge valve, and the connecting pipe is equipped with a fourth pressure gauge and a second pressure gauge valve.

5. The CNG voltage regulating device for generators as described in claim 4, characterized in that, A safety valve is provided between the primary pressure reducing valve and the secondary pressure reducing valve, and a manifold is provided at the outlet of the safety valve.

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