CNG (compressed natural gas) pressure reducing device with segmented pressure reducing function

Abstract

The utility model discloses a compressed natural gas (CNG) pressure reducing device with a segmented pressure reducing function, which comprises a box body, a first gas storage box is fixedly connected to the inner wall of one side of the box body, a second gas storage box is fixedly connected to the inner wall of the other side of the box body, a gas pump is fixedly connected to the side wall of one side of the first gas storage box, and a gas outlet is formed in the side wall of the other side of the box body. And one side of the air pump is fixedly connected with an air inlet pipe, and the air inlet pipe penetrates through the side wall of one side of the first air storage box. Through the arrangement of the first gas conveying pipe, the second gas conveying pipe, the first flow dividing pipe and the second flow dividing pipe, natural gas is divided through the first gas conveying pipe, the second gas conveying pipe, the first flow dividing pipe and the second flow dividing pipe; and the shunted compressed natural gas is subjected to two-stage pressure reduction on each line through the first heat exchanger, the first pressure regulating valve, the second heat exchanger, the second pressure regulating valve, the third pressure regulating valve, the third heat exchanger and the fourth pressure regulating valve, so that the compressed natural gas is subjected to pressure reduction use, and the pressure reduction efficiency of the compressed natural gas can be improved by adopting a natural gas shunting mode.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure reducing devices, in particular to a CNG pressure reducing device with a segmented pressure reducing function. Background Art

[0002] With the continuous development of industrialization and energy conservation and emission reduction, the demand and use of energy, especially clean energy, are becoming more and more prominent. Natural gas, as a clean energy with high calorific value and easy transportation and storage, is becoming more and more popular.

[0003] In order to facilitate storage and transportation, natural gas is compressed into compressed natural gas (CNG, full name: Compressed Natural Gas). When it is supplied to users, CNG needs to be decompressed for use. A CNG decompression device is a heat exchanger specifically used for decompressing compressed natural gas. To convert high-pressure compressed natural gas into low-pressure, room-temperature gas, it must be decompressed and provided with corresponding heat. Existing CNG decompression devices have the following deficiencies: Most of the existing decompression devices decompress CNG through a one-way channel, that is, a channel for transporting CNG, which results in low efficiency of CNG decompression and inconvenience in use. Utility Model Content

[0004] In order to overcome the shortcoming of the prior art that compressed natural gas can only be transported in one direction, resulting in low pressure reduction efficiency, one of the purposes of the utility model is to provide a CNG pressure reducing device with a staged pressure reducing function.

[0005] One of the objectives of the utility model is achieved by the following technical solution: a CNG pressure reducing device with a staged pressure reducing function, comprising a box body: a first gas storage box is fixedly connected to an inner wall of one side of the box body, a second gas storage box is fixedly connected to an inner wall of the other side of the box body, a side wall of the first gas storage box is fixedly connected to an air pump, one side of the air pump is fixedly connected to an air intake pipe, the air intake pipe runs through a side wall of the first gas storage box, a side wall of the air pump is fixedly connected to a first gas delivery pipe on a side close to the first gas delivery pipe, a first shunt pipe is fixedly connected to a side wall of the first gas delivery pipe away from the first shunt pipe, and the other end of the second shunt pipe is connected to the second gas delivery pipe; the first gas delivery pipe and the second gas delivery pipe are close to each other. A first heat exchanger is fixedly connected to an outer surface of one side near the air pump, a first pressure regulating valve is fixedly connected to the first air pipe and the second air pipe on one side near the first heat exchanger, a second heat exchanger is fixedly connected to an outer surface of the first air pipe and the second air pipe on one side near the first pressure regulating valve, a second pressure regulating valve is fixedly connected to the first air pipe and the second air pipe on one side near the second heat exchanger, a third pressure regulating valve is fixedly connected to an outer surface of one side of the first diverter pipe, a third heat exchanger is fixedly connected to an outer surface of one side of the first diverter pipe near the third pressure regulating valve, a fourth pressure regulating valve is fixedly connected to the first diverter pipe on one side near the third heat exchanger, the first air pipe, the second air pipe and the first diverter pipe all pass through a side wall of the second air storage tank and are fixedly connected to the second air storage tank. Compressed natural gas is diverted through the first gas pipeline, the second gas pipeline, the first diversion pipe and the second diversion pipe, and the diverted compressed natural gas undergoes two-stage pressure reduction on each line through the first heat exchanger, the first pressure regulating valve, the second heat exchanger, the second pressure regulating valve, the third pressure regulating valve, the third heat exchanger and the fourth pressure regulating valve, so that the compressed natural gas can be reduced in pressure for use. The method of diverting natural gas can improve the efficiency of compressed natural gas pressure reduction.

[0006] According to the CNG decompression device with segmented decompression function, the first gas delivery pipe, the second gas delivery pipe and the first diverter pipe are all fixedly connected with a one-way valve on their outer surfaces near the second gas storage tank to prevent the compressed natural gas from flowing back.

[0007] According to the CNG decompression device with segmented decompression function, the upper surface of the first gas storage box is fixedly connected with a first connecting pipe, and the side wall of the second gas storage box is fixedly connected with a second connecting pipe, so that compressed natural gas can be transported.

[0008] According to the CNG decompression device with segmented decompression function, the first gas pipeline and the second gas pipeline are both fixedly connected to a first valve on one side close to the gas pump. Any first valve on the first gas pipeline and the second gas pipeline can be closed, thereby changing the route of compressed natural gas transmission.

[0009] According to the CNG pressure reducing device with segmented pressure reducing function, a second valve is fixedly connected to the outer surface of one side of the first shunt pipe close to the first gas transmission pipe, so as to close the second valve to prevent natural gas from flowing in the first shunt pipe, thereby reducing the number of lines for compressed natural gas transmission.

[0010] According to the CNG pressure reducing device with segmented pressure reducing function, the side of the second shunt pipe close to the first gas pipe is fixedly connected with the third valve, and the side of the second shunt pipe close to the second gas pipe is fixedly connected with the fourth valve. It is convenient to close the third valve and the fourth valve so as not to connect the first gas pipe with the second gas pipe, thereby reducing the number of times of compressed natural gas diversion.

[0011] According to the CNG decompression device with segmented decompression function, the upper surface of the box is provided with a heat dissipation groove. The device inside the box will generate a certain amount of heat during operation, and the heat can be discharged through the heat dissipation groove, thereby avoiding heat accumulation inside the box.

[0012] According to the CNG decompression device with segmented decompression function, the inner wall of the heat dissipation slot is fixedly connected with a dustproof net, which can play a dustproof role and prevent dust and impurities from entering the box through the heat dissipation slot.

[0013] According to the CNG decompression device with segmented decompression function, a box door is connected to one side of the box body by screws, a groove is provided in the middle of the box door, and a transparent observation window is slidably connected to the inner wall of the groove, so as to protect the device inside the box body and prevent dust from accumulating inside the box body and affecting the use of the device.

[0014] According to the CNG decompression device with a segmented decompression function, a push handle is fixedly connected to one side of the transparent observation window, so that the transparent observation window can be pushed to open the box body for operation, and the use is convenient.

[0015] The above scheme has the following beneficial effects:

[0016] 1. By setting up the first gas pipeline, the second gas pipeline, the first diversion pipe and the second diversion pipe, the natural gas is diverted through the first gas pipeline, the second gas pipeline, the first diversion pipe and the second diversion pipe, and the diverted compressed natural gas is subjected to two-stage pressure reduction on each line through the first heat exchanger, the first pressure regulating valve, the second heat exchanger, the second pressure regulating valve, the third pressure regulating valve, the third heat exchanger and the fourth pressure regulating valve, so that the compressed natural gas is reduced in pressure for use. The method of diverting natural gas can improve the efficiency of compressed natural gas pressure reduction.

[0017] 2. Through the setting of the first valve, the second valve, the third valve and the fourth valve, the first valve, the second valve, the third valve and the fourth valve can be closed at will to reduce the transmission line of the compressed natural gas diversion, so that the number of compressed natural gas diversions can be adjusted according to actual needs, and the adjustment is convenient, thereby improving the flexibility and operability of the device.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0020] Figure 1 This is a schematic diagram of the overall structure of a CNG decompression device with a segmented decompression function according to the utility model;

[0021] Figure 2 It is a structural schematic diagram of a heat dissipation tank of a CNG decompression device with a segmented decompression function according to the utility model;

[0022] Figure 3 This is a schematic structural diagram of a first gas delivery pipe of a CNG pressure reducing device with a segmented pressure reducing function according to the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of an intake pipe of a CNG decompression device with a segmented decompression function according to the utility model;

[0024] Figure 5 It is a schematic structural diagram of an overall side view of a CNG decompression device with a segmented decompression function according to the utility model.

[0025] Legend:

[0026] 1. Box body; 2. First air storage box; 3. Second air storage box; 4. Air pump; 5. Air inlet pipe; 6. First air delivery pipe; 7. Second air delivery pipe; 8. First shunt pipe; 9. Second shunt pipe; 10. First heat exchanger; 11. First pressure regulating valve; 12. Second heat exchanger; 13. Second pressure regulating valve; 14. Third pressure regulating valve; 15. Third heat exchanger; 16. Fourth pressure regulating valve; 17. One-way valve; 18. First connecting pipe; 19. Second connecting pipe; 20. First valve; 21. Second valve; 22. Third valve; 23. Fourth valve; 24. Heat sink; 25. Dust screen; 26. Box door; 27. Groove; 28. Transparent observation window; 29. ​​Push handle. DETAILED DESCRIPTION

[0027] This section will describe in detail the specific embodiments of the utility model. 14 The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0028] Reference Figure 1-5A CNG decompression device with a staged decompression function comprises a box body 1: a first air storage box 2 is fixedly connected to the inner wall of one side of the box body 1, a second air storage box 3 is fixedly connected to the inner wall of the other side of the box body 1, an air pump 4 is fixedly connected to the side wall of the first air storage box 2, an air intake pipe 5 is fixedly connected to one side of the air pump 4, the air intake pipe 5 runs through the side wall of one side of the first air storage box 2, a first air delivery pipe 6 is fixedly connected to the other side wall of the air pump 4, a second air delivery pipe 7 is fixedly connected to the side wall of the air pump 4 close to the first air delivery pipe 6, and a first split flow pipe 6 is fixedly connected to the side wall of the first air delivery pipe 6 The first gas pipeline 6 is fixedly connected to the second gas pipeline 8 on one side away from the first branch pipe 8, and the other end of the second branch pipe 9 is connected to the second gas pipeline 7. The first gas pipeline 6 and the second gas pipeline 7 are fixedly connected to the first heat exchanger 10 on the outer surface of the side close to the air pump 4. The first gas pipeline 6 and the second gas pipeline 7 are fixedly connected to the first pressure regulating valve 11 on the side close to the first heat exchanger 10. The first gas pipeline 6 and the second gas pipeline 7 are fixedly connected to the second heat exchanger 12 on the outer surface of the side close to the first pressure regulating valve 11. A second pressure regulating valve 13 is fixedly connected to one side of the heat exchanger 12, a third pressure regulating valve 14 is fixedly connected to the outer surface of one side of the first shunt pipe 8, a third heat exchanger 15 is fixedly connected to the outer surface of one side of the first shunt pipe 8 close to the third pressure regulating valve 14, a fourth pressure regulating valve 16 is fixedly connected to the side of the first shunt pipe 8 close to the third heat exchanger 15, the first gas pipeline 6, the second gas pipeline 7 and the first shunt pipe 8 all pass through the side wall of the second gas storage box 3 and are fixedly connected to the second gas storage box 3, the first gas pipeline 6, the second gas pipeline 7 and the first shunt pipe 8 close to the second gas storage box 3 A one-way valve 17 is fixedly connected to the outer surface of one side, a first connecting pipe 18 is fixedly connected to the upper surface of the first air storage box 2, a second connecting pipe 19 is fixedly connected to the side wall of one side of the second air storage box 3, a first valve 20 is fixedly connected to the first gas pipe 6 and the second gas pipe 7 on the side close to the air pump 4, a second valve 21 is fixedly connected to the outer surface of the first branch pipe 8 on the side close to the first gas pipe 6, a third valve 22 is fixedly connected to the second branch pipe 9 on the side close to the first gas pipe 6, and a fourth valve 23 is fixedly connected to the second branch pipe 9 on the side close to the second gas pipe 7.When it is necessary to reduce the pressure of compressed natural gas, the air pump 4 is started, and the air pump 4 transports the compressed natural gas inside the first air storage tank 2 through the air intake pipe 5, the first air delivery pipe 6 and the second air delivery pipe 7. The compressed natural gas can be diverted through the first air delivery pipe 6, the second air delivery pipe 7, the first diversion pipe 8 and the second diversion pipe 9, and the diverted compressed natural gas is subjected to two-stage pressure reduction on each line through the first heat exchanger 10, the first pressure regulating valve 11, the second heat exchanger 12, the second pressure regulating valve 13, the third pressure regulating valve 14, the third heat exchanger 15 and the fourth pressure regulating valve 16. Therefore, the efficiency of compressed natural gas pressure reduction can be improved by adopting a multi-stage diversion and transportation method of compressed natural gas. At the same time, the lines for diversion of compressed natural gas can be increased or decreased by opening or closing the first valve 20, the second valve 21, the third valve 22 and the fourth valve 23, thereby improving the flexibility and practicality of the device.

[0029] The upper surface of the box body 1 is provided with a heat dissipation groove 24, and a dustproof net 25 is fixedly connected to the inner wall of the heat dissipation groove 24. A box door 26 is connected to one side of the box body 1 by screws, and a groove 27 is provided in the middle of the box door 26. A transparent observation window 28 is slidably connected to the inner wall of the groove 27, and a push handle 29 is fixedly connected to one side of the transparent observation window 28. The heat generated when the device is working will accumulate in the box body 1, and the heat inside the box body 1 can be discharged through the heat dissipation groove 24. The push handle 29 is pushed to open the transparent observation window 28, so as to facilitate the operation of the device. When the device is not operated, the transparent observation window 28 can play a protective role to prevent dust and impurities from entering the box body 1 and affecting the use of the device.

[0030] Working principle: when it is necessary to reduce the pressure of compressed natural gas, start the air pump 4, and the air pump 4 transports the compressed natural gas inside the first air storage tank 2 through the air intake pipe 5, the first air delivery pipe 6 and the second air delivery pipe 7. The compressed natural gas can be diverted through the first air delivery pipe 6, the second air delivery pipe 7, the first diversion pipe 8 and the second diversion pipe 9, and the diverted compressed natural gas is subjected to two-stage pressure reduction on each line through the first heat exchanger 10, the first pressure regulating valve 11, the second heat exchanger 12, the second pressure regulating valve 13, the third pressure regulating valve 14, the third heat exchanger 15 and the fourth pressure regulating valve 16. Therefore, the efficiency of compressed natural gas pressure reduction can be improved by adopting a multi-stage diversion and transportation method of compressed natural gas. At the same time, the lines for the diversion of compressed natural gas can be increased or reduced by opening or closing the first valve 20, the second valve 21, the third valve 22 and the fourth valve 23, thereby improving the flexibility and practicality of the device. The compressed natural gas after decompression is transported through the second air storage tank 3 and the second connecting pipe 19, which is easy to use.

[0031] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A CNG decompression device with a staged decompression function, characterized in that: The invention comprises a box body (1): a first air storage box (2) is fixedly connected to an inner wall of one side of the box body (1), a second air storage box (3) is fixedly connected to an inner wall of the other side of the box body (1), an air pump (4) is fixedly connected to a side wall of the first air storage box (2), an air intake pipe (5) is fixedly connected to one side of the air pump (4), the air intake pipe (5) runs through a side wall of one side of the first air storage box (2), a first air supply pipe (6) is fixedly connected to the other side wall of the air pump (4), a second air supply pipe (7) is fixedly connected to a side wall of the air pump (4) close to the first air supply pipe (6), a first shunt pipe (8) is fixedly connected to a side wall of the first air supply pipe (6) away from the first shunt pipe (8), and the other end of the second shunt pipe (9) is connected to the second air supply pipe (7); The first gas pipeline (6) and the second gas pipeline (7) are both fixedly connected to a first heat exchanger (10) on their outer surfaces on one side close to the gas pump (4); the first gas pipeline (6) and the second gas pipeline (7) are both fixedly connected to a first pressure regulating valve (11) on their outer surfaces on one side close to the first pressure regulating valve (11); the first gas pipeline (6) and the second gas pipeline (7) are both fixedly connected to a second heat exchanger (12) on their outer surfaces on one side close to the first pressure regulating valve (11); the first gas pipeline (6) and the second gas pipeline (7) are both fixedly connected to a second heat exchanger (12) on their outer surfaces on one side close to the second heat exchanger (12). A second pressure regulating valve (13) is fixedly connected thereto; a third pressure regulating valve (14) is fixedly connected to an outer surface of one side of the first shunt pipe (8); a third heat exchanger (15) is fixedly connected to an outer surface of a side of the first shunt pipe (8) close to the third pressure regulating valve (14); a fourth pressure regulating valve (16) is fixedly connected to a side of the first shunt pipe (8) close to the third heat exchanger (15); the first gas supply pipe (6), the second gas supply pipe (7) and the first shunt pipe (8) all pass through a side wall of the second gas storage box (3) and are fixedly connected to the second gas storage box (3).

2. A CNG decompression device with a staged decompression function according to claim 1, characterized in that: One-way valves (17) are fixedly connected to the outer surfaces of the first gas delivery pipe (6), the second gas delivery pipe (7) and the first diverter pipe (8) on one side close to the second gas storage box (3).

3. A CNG decompression device with a staged decompression function according to claim 1, characterized in that: A first connecting pipe (18) is fixedly connected to the upper surface of the first air storage box (2), and a second connecting pipe (19) is fixedly connected to a side wall of the second air storage box (3).

4. A CNG decompression device with a staged decompression function according to claim 1, characterized in that: A first valve (20) is fixedly connected to one side of the first gas supply pipe (6) and the second gas supply pipe (7) close to the gas pump (4).

5. The CNG decompression device with staged decompression function according to claim 1, characterized in that: A second valve (21) is fixedly connected to the outer surface of one side of the first diversion pipe (8) close to the first gas delivery pipe (6).

6. A CNG decompression device with a staged decompression function according to claim 1, characterized in that: A third valve (22) is fixedly connected to the side of the second shunt pipe (9) close to the first gas pipe (6), and a fourth valve (23) is fixedly connected to the side of the second shunt pipe (9) close to the second gas pipe (7).

7. A CNG decompression device with a staged decompression function according to claim 1, characterized in that: The upper surface of the box body (1) is provided with a heat dissipation groove (24).

8. A CNG decompression device with a staged decompression function according to claim 7, characterized in that: A dustproof net (25) is fixedly connected to the inner wall of the heat dissipation groove (24).

9. The CNG decompression device with staged decompression function according to claim 1, characterized in that: A box door (26) is connected to one side of the box body (1) by means of screws, a groove (27) is provided in the middle of the box door (26), and a transparent observation window (28) is slidably connected to the inner wall of the groove (27).

10. A CNG decompression device with a staged decompression function according to claim 9, characterized in that: A push handle (29) is fixedly connected to one side of the transparent observation window (28).

Images