Gas flow pressure regulating device

Abstract

The present invention relates to a gas flow pressure regulating device, comprising a first module and a second module, wherein the first module comprises a first main pipeline, two first manifolds and a plurality of first branch pipelines, the plurality of first branch pipelines are parallel to the first main pipeline, a main flow regulating valve and a one-way valve are arranged on the first main pipeline, and a secondary flow regulating valve and a one-way valve are arranged on the first branch pipeline; the second module comprises a second main pipeline, two second manifolds and a plurality of second branch pipelines, the plurality of second branch pipelines are parallel to the second main pipeline, a main pressure regulating valve is arranged on the second main pipeline, and a secondary pressure regulating valve is arranged on the second branch pipeline; the air inlet of the gas-using equipment is connected to the first main pipeline of the first module, and the air outlet is connected to the second main pipeline of the second module. Compared with the prior art, the present invention has the advantages of being able to realize step-by-step precise regulation of flow and pressure, expanding the flow / pressure range, and ensuring that each regulating valve is at the optimal control opening.

Description

Technical Field

[0001] The invention relates to the field of industrial equipment production, and in particular to a gas flow pressure regulating device. Background Art

[0002] The precise control of gas flow and pressure is widely demanded in the fields of fuel cells, hydrogen, natural gas, air compressors, chemicals, energy conservation, environmental protection, etc. There are various forms of valves that can realize gas flow and pressure control to meet the general needs of industrial sites. However, in the fields of fuel cells, aerospace, etc., due to their complex working conditions, their gas flow and working pressure vary widely, and conventional mass flow controllers and pressure regulating valves have their applicable ranges, which are difficult to meet the high-precision control requirements within a wide flow and pressure regulation range. For example: the control range ratio of gas mass flow controllers is generally 1:100; and the regulating valve, according to the selection of its valve Kv value, has a valve opening adjustment range of 10% to 90%, of which the best control effect is in the 20% to 90% opening range. Beyond their optimal range, their control accuracy is greatly reduced. Therefore, the market needs a device suitable for large flow and pressure range working conditions and high-precision control to meet the special flow and pressure control needs of fuel cells, air compressors, etc. Summary of the invention

[0003] The purpose of the present invention is to provide a gas flow pressure regulating device in order to overcome the defects of the above-mentioned prior art.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A gas flow pressure regulating device comprises a first module and a second module, wherein:

[0006] The first module comprises a first main pipeline, two first manifolds and a plurality of first branch pipelines, the two first manifolds are vertically connected to the first main pipeline, the two ends of the plurality of first branch pipelines are respectively connected to the two first manifolds and are parallel to the first main pipeline, the first main pipeline is provided with a main flow regulating valve and a one-way valve, and the first branch pipeline is provided with a secondary flow regulating valve and a one-way valve;

[0007] The second module comprises a second main pipeline, two second manifolds and a plurality of second branch pipelines, the two second manifolds are vertically connected to the second main pipeline, the two ends of the plurality of second branch pipelines are respectively connected to the two second manifolds and are parallel to the second main pipeline, the second main pipeline is provided with a main pressure regulating valve, and the second branch pipeline is provided with a secondary pressure regulating valve;

[0008] The air inlet of the air-using equipment is connected to the first main pipeline of the first module, and the air outlet is connected to the second main pipeline of the second module.

[0009] Furthermore, the maximum controllable flow of the primary flow regulating valve is 2 to 3 times that of the secondary flow regulating valve.

[0010] Furthermore, the kv value of the main pressure regulating valve is 5 to 8 times that of the secondary pressure regulating valve.

[0011] Furthermore, the diameter of the first main pipeline is twice that of the first branch pipeline.

[0012] Furthermore, the diameter of the second main pipeline is three times that of the second branch pipeline.

[0013] Furthermore, the two first manifolds and the first main pipeline have the same diameter; the two second manifolds and the second main pipeline have the same diameter.

[0014] Furthermore, a first pressure sensor is provided at the air outlet of the first main pipeline, and a second pressure sensor is provided at the air inlet of the second main pipeline.

[0015] Furthermore, a pressure reducing valve is connected to the air inlet end of the first main pipeline.

[0016] Furthermore, it also includes a control module for connecting the main flow regulating valve, the secondary flow regulating valve, the main pressure regulating valve and the secondary pressure regulating valve.

[0017] Furthermore, the number of the first branch pipelines is 2 to 6; the number of the second branch pipelines is 2 to 6.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention designs two modules which are respectively arranged at the air inlet and the air outlet of the gas-consuming equipment, and then each module adopts a main pipeline and multiple branch pipelines in parallel. By setting flow regulating valves and pressure regulating valves on the pipelines, the flow and pressure can be precisely adjusted in steps. At the same time, the present invention opens different numbers of first branch pipelines and second branch pipelines, expands the flow / pressure range through permutations and combinations, and ensures that each regulating valve is at the optimal control opening, thereby achieving high-precision control and meeting special control requirements in the fields of fuel cells, air compressors, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure markings: 1-first module; 11-first main pipeline; 12-first branch pipeline; 13-first manifold; 14-main flow regulating valve; 15-secondary flow regulating valve; 2-second module; 21-second main pipeline; 22-second branch pipeline; 23-second manifold; 24-main pressure regulating valve; 25-secondary pressure regulating valve; 3-check valve; 4-first pressure sensor; 5-second pressure sensor; 6-control module. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0023] like Figure 1 As shown, this embodiment provides a gas flow pressure regulating device, including a first module 1, a second module 2 and a control module 6, wherein:

[0024] The first module 1 includes a first main pipeline 11, two first manifolds 13 and a plurality of first branch pipelines 12. The two ends of the first main pipeline 11 are respectively an air inlet and an air outlet, and the two first manifolds 13 are respectively connected to the two ends of the first main pipeline 11 vertically through a tee. The two ends of the plurality of first branch pipelines 12 are respectively connected to the two first manifolds 13 and are parallel to the first main pipeline 11. The diameter of the first main pipeline 11 is twice that of the first branch pipeline 12; the diameters of the two first manifolds 13 and the first main pipeline 11 are the same. The number of first branch pipelines 12 is generally 2 to 6, preferably 4. A main flow regulating valve 14 and a one-way valve 3 are provided on the first main pipeline 11, and a secondary flow regulating valve 15 and a one-way valve 3 are provided on the first branch pipeline 12; the maximum controllable flow of the main flow regulating valve 14 is generally 2 to 3 times that of the secondary flow regulating valve 15.

[0025] The second module 2 includes a second main pipeline 21, two second manifolds 23 and a plurality of second branch pipelines 22. The two ends of the second main pipeline 21 are respectively an air inlet and an air outlet, and the two second manifolds 23 are respectively connected to the two ends of the second main pipeline 21 vertically through a tee. The two ends of the plurality of second branch pipelines 22 are respectively connected to the two second manifolds 23 and are parallel to the second main pipeline 21. The diameter of the second main pipeline 21 is 3 times that of the second branch pipeline 22; the two second manifolds 23 and the second main pipeline 21 have the same diameter. The number of second branch pipelines 22 is generally 2 to 6, and 4 are preferably used in this embodiment. A main pressure regulating valve 24 is provided on the second main pipeline 21, and a secondary pressure regulating valve 25 is provided on the second branch pipeline 22; the kv value of the main pressure regulating valve 24 is 5 to 8 times that of the secondary pressure regulating valve 25.

[0026] The control module 6 is a conventional computer system, which is used to connect the primary flow regulating valve 14, the secondary flow regulating valve 15, the primary pressure regulating valve 24 and the secondary pressure regulating valve 25, and execute a preset software program to achieve precise regulation.

[0027] When in use, the air inlet of the gas-using device is connected to the air outlet of the first main pipeline 11 of the first module 1; the air outlet of the gas-using device is connected to the air inlet of the main pipeline of the second module 2. In order to ensure working stability, a pressure reducing valve is also connected to the air inlet end of the first main pipeline 11. A first pressure sensor 4 is provided at the air outlet of the first main pipeline 11, and a second pressure sensor 5 is provided at the air inlet of the second main pipeline 21. The first pressure sensor 4 and the second pressure sensor 5 are both connected to the control module 6. The control module 6 adjusts the opening of the main flow regulating valve 14 and the main pressure regulating valve 24 according to the target flow and pressure of the gas in the main pipeline, and adjusts the secondary flow regulating valve 15 and the secondary pressure regulating valve 25 of the branch pipeline arranged in parallel with the main pipeline according to the flow rate.

[0028] The working principle of this embodiment is:

[0029] The main flow regulating valve 14 and the secondary flow regulating valve 15 have different flow ranges, and the flow ranges of the secondary flow regulating valves 15 can be the same or different; at the same time, the main pressure regulating valve 24 and the secondary pressure regulating valve 25 have different pressure ranges, and the pressure ranges of the secondary flow regulating valves 15 can be the same or different; thus, the range can be greatly expanded through different setting ratios, and the flow and pressure of the gas can be adjusted with high precision as needed.

[0030] The control module 6 specifically includes an operator and a controller. The first pressure sensor 4 collects the pressure of the airflow at the inlet of the application object, such as a fuel cell stack, and feeds it back to the operator; the second pressure sensor 5 collects the airflow pressure at the outlet of the application object and feeds it back to the operator. At the same time, each flow regulating valve in the pipeline can be used to control the gas flow, and its actual flow is fed back to the operator. According to the target value and the feedback data of the operator, the controller selects the flow regulating valve and pressure regulating valve that meet the high-precision control requirements under the appropriate target flow, and selects and controls the opening and closing. Both the flow regulating valve and the pressure regulating valve are preferably linear throttle valves to achieve an opening adjustment range within the optimal range. Under low flow conditions, high-precision pressure control is achieved through the secondary regulating valve in the branch pipeline. Under high flow conditions, the main regulating valve in the main pipeline is quickly adjusted to achieve 80%-90% of the target flow, and the remaining small flow is controlled with high precision by the secondary regulating valve in the branch pipeline, so that the flow and pressure of the final output gas meet the target requirements.

[0031] This embodiment takes a humidification tank as an example to control the air humidification pressure:

[0032] The gas-using equipment in this embodiment is a humidifying tank equipped with a heating function. In the first module 1, the main flow control valve 14 (MFC) in the first main pipeline 11 can control the maximum flow of 5000SLPM, the range ratio is 100:1, and the pipeline diameter is 2 standard units; the secondary flow control valve 15 (MFC) in the branch pipeline can control the maximum flow of 2000SLPM, the range ratio is 100:1, and the pipeline diameter is 1 standard unit. In the second module 2, the main pressure control valve 24 in the second main pipeline adopts a proportional control valve with a kv value of 40, and the supporting pipeline diameter is 3 standard units; the secondary pressure control valve 25 in the branch pipeline adopts a proportional control valve with a kv value of 6.3, and the supporting pipeline diameter is 1 standard unit.

[0033] The first main pipeline 11 is connected to a gas source regulated to 6 barg by a primary pressure reducing valve. According to the set requirements, the control module 6 controls the opening of the main flow regulating valve 14 and the closing and opening of the secondary flow regulating valve 15; when both are fully opened, the maximum controllable flow rate can reach (5000+2000*n) SLPM, where n is the number of the first branch pipelines 12. When only the secondary flow regulating valve 15 of one first branch pipeline 12 is opened, the high-precision control of the minimum gas flow rate of 2000 SLPM is achieved. Below this flow rate, the flow control accuracy decreases.

[0034] The humidification tank contains deionized water, which can humidify the passing gas by heating and temperature control. The second module 2 at the rear end is used to control the inlet / outlet pressure of the humidification tank. According to the data acquisition of the first pressure sensor 4 and the second pressure sensor 5 and the calculation of the operator, the opening and closing of the main pressure regulating valve 24 and the secondary pressure regulating valve 25 are adjusted by the controller according to the actual inlet flow of the humidification tank and the required control pressure. The pressure control range is 5kPag ~ 400kPag, and the control accuracy is ≤ ± 2kPa.

[0035] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A gas flow pressure regulating device, characterized in that: It comprises a first module (1) and a second module (2), wherein: The first module (1) comprises a first main pipeline (11), two first manifolds (13) and a plurality of first branch pipelines (12); the two first manifolds (13) are vertically connected to the first main pipeline (11); the two ends of the plurality of first branch pipelines (12) are respectively connected to the two first manifolds (13) and are parallel to the first main pipeline (11); the first main pipeline (11) is provided with a main flow regulating valve (14) and a one-way valve (3); the first branch pipeline (12) is provided with a secondary flow regulating valve (15) and a one-way valve (3); The second module (2) comprises a second main pipeline (21), two second manifolds (23) and a plurality of second branch pipelines (22); the two second manifolds (23) are vertically connected to the second main pipeline (21); the two ends of the plurality of second branch pipelines (22) are respectively connected to the two second manifolds (23) and are parallel to the second main pipeline (21); a main pressure regulating valve (24) is provided on the second main pipeline (21); and a secondary pressure regulating valve (25) is provided on the second branch pipeline (22); The air inlet of the air-using equipment is connected to the first main pipeline (11) of the first module (1), and the air outlet is connected to the second main pipeline (21) of the second module (2).

2. A gas flow pressure regulating device according to claim 1, characterized in that: The maximum controllable flow rate of the primary flow regulating valve (14) is 2 to 3 times that of the secondary flow regulating valve (15).

3. A gas flow pressure regulating device according to claim 1, characterized in that: The kv value of the main pressure regulating valve (24) is 5 to 8 times that of the secondary pressure regulating valve (25).

4. A gas flow pressure regulating device according to claim 1, characterized in that: The diameter of the first main pipeline (11) is twice that of the first branch pipeline (12).

5. A gas flow pressure regulating device according to claim 1, characterized in that: The diameter of the second main pipeline (21) is three times that of the second branch pipeline (22).

6. A gas flow pressure regulating device according to claim 1, characterized in that: The two first conduit pipes (13) and the first main pipeline (11) have the same diameter; the two second conduit pipes (23) and the second main pipeline (21) have the same diameter.

7. A gas flow pressure regulating device according to claim 1, characterized in that: A first pressure sensor (4) is provided at the air outlet of the first main pipeline (11), and a second pressure sensor (5) is provided at the air inlet of the second main pipeline (21).

8. A gas flow pressure regulating device according to claim 1, characterized in that: The air inlet end of the first main pipeline (11) is connected to a pressure reducing valve.

9. A gas flow pressure regulating device according to claim 1, characterized in that: It also includes a control module (6) for connecting the primary flow regulating valve (14), the secondary flow regulating valve (15), the primary pressure regulating valve (24) and the secondary pressure regulating valve (25).

10. A gas flow pressure regulating device according to claim 1, characterized in that: The number of the first branch pipelines (12) is 2 to 6; the number of the second branch pipelines (22) is 2 to 6.

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